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 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_SECTION_NAME (newdecl) == NULL_TREE)
2308 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
2310 /* Copy the assembler name.
2311 Currently, it can only be defined in the prototype. */
2312 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2314 /* Use visibility of whichever declaration had it specified */
2315 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2317 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2318 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2321 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2323 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2324 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2325 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2326 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2327 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2328 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2329 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2330 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2331 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2332 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2333 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
2336 /* Merge the storage class information. */
2337 merge_weak (newdecl, olddecl);
2339 /* For functions, static overrides non-static. */
2340 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2342 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2343 /* This is since we don't automatically
2344 copy the attributes of NEWDECL into OLDDECL. */
2345 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2346 /* If this clears `static', clear it in the identifier too. */
2347 if (!TREE_PUBLIC (olddecl))
2348 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2352 /* In c99, 'extern' declaration before (or after) 'inline' means this
2353 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2355 if (TREE_CODE (newdecl) == FUNCTION_DECL
2356 && !flag_gnu89_inline
2357 && (DECL_DECLARED_INLINE_P (newdecl)
2358 || DECL_DECLARED_INLINE_P (olddecl))
2359 && (!DECL_DECLARED_INLINE_P (newdecl)
2360 || !DECL_DECLARED_INLINE_P (olddecl)
2361 || !DECL_EXTERNAL (olddecl))
2362 && DECL_EXTERNAL (newdecl)
2363 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
2364 && !current_function_decl)
2365 DECL_EXTERNAL (newdecl) = 0;
2367 /* An inline definition following a static declaration is not
2369 if (new_is_definition
2370 && (DECL_DECLARED_INLINE_P (newdecl)
2371 || DECL_DECLARED_INLINE_P (olddecl))
2372 && !TREE_PUBLIC (olddecl))
2373 DECL_EXTERNAL (newdecl) = 0;
2375 if (DECL_EXTERNAL (newdecl))
2377 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2378 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2380 /* An extern decl does not override previous storage class. */
2381 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2382 if (!DECL_EXTERNAL (newdecl))
2384 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2385 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2390 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2391 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2394 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2396 /* If we're redefining a function previously defined as extern
2397 inline, make sure we emit debug info for the inline before we
2398 throw it away, in case it was inlined into a function that
2399 hasn't been written out yet. */
2400 if (new_is_definition && DECL_INITIAL (olddecl))
2401 /* The new defn must not be inline. */
2402 DECL_UNINLINABLE (newdecl) = 1;
2405 /* If either decl says `inline', this fn is inline, unless
2406 its definition was passed already. */
2407 if (DECL_DECLARED_INLINE_P (newdecl)
2408 || DECL_DECLARED_INLINE_P (olddecl))
2409 DECL_DECLARED_INLINE_P (newdecl) = 1;
2411 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2412 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2414 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2415 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2416 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2417 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2420 if (DECL_BUILT_IN (olddecl))
2422 /* If redeclaring a builtin function, it stays built in.
2423 But it gets tagged as having been declared. */
2424 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2425 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2426 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
2427 if (new_is_prototype)
2429 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
2430 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2432 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2435 /* If a compatible prototype of these builtin functions
2436 is seen, assume the runtime implements it with the
2437 expected semantics. */
2438 case BUILT_IN_STPCPY:
2439 if (builtin_decl_explicit_p (fncode))
2440 set_builtin_decl_implicit_p (fncode, true);
2448 C_DECL_BUILTIN_PROTOTYPE (newdecl)
2449 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
2452 /* Preserve function specific target and optimization options */
2453 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2454 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2455 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2456 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2458 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2459 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2460 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2461 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2463 /* Also preserve various other info from the definition. */
2464 if (!new_is_definition)
2467 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2468 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2469 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2470 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2471 DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl));
2472 for (t = DECL_ARGUMENTS (newdecl); t ; t = DECL_CHAIN (t))
2473 DECL_CONTEXT (t) = newdecl;
2475 /* See if we've got a function to instantiate from. */
2476 if (DECL_SAVED_TREE (olddecl))
2477 DECL_ABSTRACT_ORIGIN (newdecl)
2478 = DECL_ABSTRACT_ORIGIN (olddecl);
2482 /* Merge the USED information. */
2483 if (TREE_USED (olddecl))
2484 TREE_USED (newdecl) = 1;
2485 else if (TREE_USED (newdecl))
2486 TREE_USED (olddecl) = 1;
2487 if (TREE_CODE (olddecl) == VAR_DECL || TREE_CODE (olddecl) == PARM_DECL)
2488 DECL_READ_P (newdecl) |= DECL_READ_P (olddecl);
2489 if (DECL_PRESERVE_P (olddecl))
2490 DECL_PRESERVE_P (newdecl) = 1;
2491 else if (DECL_PRESERVE_P (newdecl))
2492 DECL_PRESERVE_P (olddecl) = 1;
2494 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2495 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2496 DECL_ARGUMENTS (if appropriate). */
2498 unsigned olddecl_uid = DECL_UID (olddecl);
2499 tree olddecl_context = DECL_CONTEXT (olddecl);
2500 tree olddecl_arguments = NULL;
2501 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2502 olddecl_arguments = DECL_ARGUMENTS (olddecl);
2504 memcpy ((char *) olddecl + sizeof (struct tree_common),
2505 (char *) newdecl + sizeof (struct tree_common),
2506 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2507 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2508 switch (TREE_CODE (olddecl))
2513 struct symtab_node *snode = olddecl->decl_with_vis.symtab_node;
2515 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2516 (char *) newdecl + sizeof (struct tree_decl_common),
2517 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2518 olddecl->decl_with_vis.symtab_node = snode;
2528 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2529 (char *) newdecl + sizeof (struct tree_decl_common),
2530 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2535 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2536 (char *) newdecl + sizeof (struct tree_decl_common),
2537 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
2539 DECL_UID (olddecl) = olddecl_uid;
2540 DECL_CONTEXT (olddecl) = olddecl_context;
2541 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2542 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
2545 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2546 so that encode_section_info has a chance to look at the new decl
2547 flags and attributes. */
2548 if (DECL_RTL_SET_P (olddecl)
2549 && (TREE_CODE (olddecl) == FUNCTION_DECL
2550 || (TREE_CODE (olddecl) == VAR_DECL
2551 && TREE_STATIC (olddecl))))
2552 make_decl_rtl (olddecl);
2555 /* Handle when a new declaration NEWDECL has the same name as an old
2556 one OLDDECL in the same binding contour. Prints an error message
2559 If safely possible, alter OLDDECL to look like NEWDECL, and return
2560 true. Otherwise, return false. */
2563 duplicate_decls (tree newdecl, tree olddecl)
2565 tree newtype = NULL, oldtype = NULL;
2567 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
2569 /* Avoid `unused variable' and other warnings for OLDDECL. */
2570 TREE_NO_WARNING (olddecl) = 1;
2574 merge_decls (newdecl, olddecl, newtype, oldtype);
2576 /* The NEWDECL will no longer be needed. */
2582 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2584 warn_if_shadowing (tree new_decl)
2586 struct c_binding *b;
2588 /* Shadow warnings wanted? */
2590 /* No shadow warnings for internally generated vars. */
2591 || DECL_IS_BUILTIN (new_decl)
2592 /* No shadow warnings for vars made for inlining. */
2593 || DECL_FROM_INLINE (new_decl))
2596 /* Is anything being shadowed? Invisible decls do not count. */
2597 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
2598 if (b->decl && b->decl != new_decl && !b->invisible
2599 && (b->decl == error_mark_node
2600 || diagnostic_report_warnings_p (global_dc,
2601 DECL_SOURCE_LOCATION (b->decl))))
2603 tree old_decl = b->decl;
2604 bool warned = false;
2606 if (old_decl == error_mark_node)
2608 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
2609 "non-variable", new_decl);
2612 else if (TREE_CODE (old_decl) == PARM_DECL)
2613 warned = warning (OPT_Wshadow,
2614 "declaration of %q+D shadows a parameter",
2616 else if (DECL_FILE_SCOPE_P (old_decl))
2618 /* Do not warn if a variable shadows a function, unless
2619 the variable is a function or a pointer-to-function. */
2620 if (TREE_CODE (old_decl) == FUNCTION_DECL
2621 && TREE_CODE (new_decl) != FUNCTION_DECL
2622 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl)))
2625 warned = warning_at (DECL_SOURCE_LOCATION (new_decl), OPT_Wshadow,
2626 "declaration of %qD shadows a global "
2630 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2631 && DECL_BUILT_IN (old_decl))
2633 warning (OPT_Wshadow, "declaration of %q+D shadows "
2634 "a built-in function", new_decl);
2638 warned = warning (OPT_Wshadow, "declaration of %q+D shadows a "
2639 "previous local", new_decl);
2642 inform (DECL_SOURCE_LOCATION (old_decl),
2643 "shadowed declaration is here");
2649 /* Record a decl-node X as belonging to the current lexical scope.
2650 Check for errors (such as an incompatible declaration for the same
2651 name already seen in the same scope).
2653 Returns either X or an old decl for the same name.
2654 If an old decl is returned, it may have been smashed
2655 to agree with what X says. */
2660 tree name = DECL_NAME (x);
2661 struct c_scope *scope = current_scope;
2662 struct c_binding *b;
2663 bool nested = false;
2664 location_t locus = DECL_SOURCE_LOCATION (x);
2666 /* Must set DECL_CONTEXT for everything not at file scope or
2667 DECL_FILE_SCOPE_P won't work. Local externs don't count
2668 unless they have initializers (which generate code). */
2669 if (current_function_decl
2670 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2671 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2672 DECL_CONTEXT (x) = current_function_decl;
2674 /* Anonymous decls are just inserted in the scope. */
2677 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
2682 /* First, see if there is another declaration with the same name in
2683 the current scope. If there is, duplicate_decls may do all the
2684 work for us. If duplicate_decls returns false, that indicates
2685 two incompatible decls in the same scope; we are to silently
2686 replace the old one (duplicate_decls has issued all appropriate
2687 diagnostics). In particular, we should not consider possible
2688 duplicates in the external scope, or shadowing. */
2689 b = I_SYMBOL_BINDING (name);
2690 if (b && B_IN_SCOPE (b, scope))
2692 struct c_binding *b_ext, *b_use;
2693 tree type = TREE_TYPE (x);
2694 tree visdecl = b->decl;
2695 tree vistype = TREE_TYPE (visdecl);
2696 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2697 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2698 b->inner_comp = false;
2701 /* If this is an external linkage declaration, we should check
2702 for compatibility with the type in the external scope before
2703 setting the type at this scope based on the visible
2704 information only. */
2705 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2707 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2708 b_ext = b_ext->shadowed;
2713 TREE_TYPE (b_use->decl) = b_use->u.type;
2716 if (duplicate_decls (x, b_use->decl))
2720 /* Save the updated type in the external scope and
2721 restore the proper type for this scope. */
2723 if (comptypes (vistype, type))
2724 thistype = composite_type (vistype, type);
2726 thistype = TREE_TYPE (b_use->decl);
2727 b_use->u.type = TREE_TYPE (b_use->decl);
2728 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2729 && DECL_BUILT_IN (b_use->decl))
2731 = build_type_attribute_variant (thistype,
2734 TREE_TYPE (b_use->decl) = thistype;
2739 goto skip_external_and_shadow_checks;
2742 /* All declarations with external linkage, and all external
2743 references, go in the external scope, no matter what scope is
2744 current. However, the binding in that scope is ignored for
2745 purposes of normal name lookup. A separate binding structure is
2746 created in the requested scope; this governs the normal
2747 visibility of the symbol.
2749 The binding in the externals scope is used exclusively for
2750 detecting duplicate declarations of the same object, no matter
2751 what scope they are in; this is what we do here. (C99 6.2.7p2:
2752 All declarations that refer to the same object or function shall
2753 have compatible type; otherwise, the behavior is undefined.) */
2754 if (DECL_EXTERNAL (x) || scope == file_scope)
2756 tree type = TREE_TYPE (x);
2759 bool type_saved = false;
2760 if (b && !B_IN_EXTERNAL_SCOPE (b)
2761 && (TREE_CODE (b->decl) == FUNCTION_DECL
2762 || TREE_CODE (b->decl) == VAR_DECL)
2763 && DECL_FILE_SCOPE_P (b->decl))
2766 vistype = TREE_TYPE (visdecl);
2768 if (scope != file_scope
2769 && !DECL_IN_SYSTEM_HEADER (x))
2770 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2772 while (b && !B_IN_EXTERNAL_SCOPE (b))
2774 /* If this decl might be modified, save its type. This is
2775 done here rather than when the decl is first bound
2776 because the type may change after first binding, through
2777 being completed or through attributes being added. If we
2778 encounter multiple such decls, only the first should have
2779 its type saved; the others will already have had their
2780 proper types saved and the types will not have changed as
2781 their scopes will not have been re-entered. */
2782 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2784 b->u.type = TREE_TYPE (b->decl);
2787 if (B_IN_FILE_SCOPE (b)
2788 && TREE_CODE (b->decl) == VAR_DECL
2789 && TREE_STATIC (b->decl)
2790 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2791 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2792 && TREE_CODE (type) == ARRAY_TYPE
2793 && TYPE_DOMAIN (type)
2794 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2795 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2797 /* Array type completed in inner scope, which should be
2798 diagnosed if the completion does not have size 1 and
2799 it does not get completed in the file scope. */
2800 b->inner_comp = true;
2805 /* If a matching external declaration has been found, set its
2806 type to the composite of all the types of that declaration.
2807 After the consistency checks, it will be reset to the
2808 composite of the visible types only. */
2809 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2811 TREE_TYPE (b->decl) = b->u.type;
2813 /* The point of the same_translation_unit_p check here is,
2814 we want to detect a duplicate decl for a construct like
2815 foo() { extern bar(); } ... static bar(); but not if
2816 they are in different translation units. In any case,
2817 the static does not go in the externals scope. */
2819 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2820 && duplicate_decls (x, b->decl))
2825 if (comptypes (vistype, type))
2826 thistype = composite_type (vistype, type);
2828 thistype = TREE_TYPE (b->decl);
2832 b->u.type = TREE_TYPE (b->decl);
2833 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2835 = build_type_attribute_variant (thistype,
2836 TYPE_ATTRIBUTES (b->u.type));
2837 TREE_TYPE (b->decl) = thistype;
2838 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
2842 else if (TREE_PUBLIC (x))
2844 if (visdecl && !b && duplicate_decls (x, visdecl))
2846 /* An external declaration at block scope referring to a
2847 visible entity with internal linkage. The composite
2848 type will already be correct for this scope, so we
2849 just need to fall through to make the declaration in
2856 bind (name, x, external_scope, /*invisible=*/true,
2857 /*nested=*/false, locus);
2863 if (TREE_CODE (x) != PARM_DECL)
2864 warn_if_shadowing (x);
2866 skip_external_and_shadow_checks:
2867 if (TREE_CODE (x) == TYPE_DECL)
2869 /* So this is a typedef, set its underlying type. */
2870 set_underlying_type (x);
2872 /* If X is a typedef defined in the current function, record it
2873 for the purpose of implementing the -Wunused-local-typedefs
2875 record_locally_defined_typedef (x);
2878 bind (name, x, scope, /*invisible=*/false, nested, locus);
2880 /* If x's type is incomplete because it's based on a
2881 structure or union which has not yet been fully declared,
2882 attach it to that structure or union type, so we can go
2883 back and complete the variable declaration later, if the
2884 structure or union gets fully declared.
2886 If the input is erroneous, we can have error_mark in the type
2887 slot (e.g. "f(void a, ...)") - that doesn't count as an
2889 if (TREE_TYPE (x) != error_mark_node
2890 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2892 tree element = TREE_TYPE (x);
2894 while (TREE_CODE (element) == ARRAY_TYPE)
2895 element = TREE_TYPE (element);
2896 element = TYPE_MAIN_VARIANT (element);
2898 if ((TREE_CODE (element) == RECORD_TYPE
2899 || TREE_CODE (element) == UNION_TYPE)
2900 && (TREE_CODE (x) != TYPE_DECL
2901 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2902 && !COMPLETE_TYPE_P (element))
2903 C_TYPE_INCOMPLETE_VARS (element)
2904 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2909 /* Record X as belonging to file scope.
2910 This is used only internally by the Objective-C front end,
2911 and is limited to its needs. duplicate_decls is not called;
2912 if there is any preexisting decl for this identifier, it is an ICE. */
2915 pushdecl_top_level (tree x)
2918 bool nested = false;
2919 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2921 name = DECL_NAME (x);
2923 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2925 if (TREE_PUBLIC (x))
2927 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false,
2932 bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION);
2938 implicit_decl_warning (tree id, tree olddecl)
2940 if (warn_implicit_function_declaration)
2945 warned = pedwarn (input_location, OPT_Wimplicit_function_declaration,
2946 "implicit declaration of function %qE", id);
2948 warned = warning (OPT_Wimplicit_function_declaration,
2949 G_("implicit declaration of function %qE"), id);
2950 if (olddecl && warned)
2951 locate_old_decl (olddecl);
2955 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2956 function of type int (). */
2959 implicitly_declare (location_t loc, tree functionid)
2961 struct c_binding *b;
2965 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2967 if (B_IN_SCOPE (b, external_scope))
2976 if (decl == error_mark_node)
2979 /* FIXME: Objective-C has weird not-really-builtin functions
2980 which are supposed to be visible automatically. They wind up
2981 in the external scope because they're pushed before the file
2982 scope gets created. Catch this here and rebind them into the
2984 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2986 bind (functionid, decl, file_scope,
2987 /*invisible=*/false, /*nested=*/true,
2988 DECL_SOURCE_LOCATION (decl));
2993 tree newtype = default_function_type;
2995 TREE_TYPE (decl) = b->u.type;
2996 /* Implicit declaration of a function already declared
2997 (somehow) in a different scope, or as a built-in.
2998 If this is the first time this has happened, warn;
2999 then recycle the old declaration but with the new type. */
3000 if (!C_DECL_IMPLICIT (decl))
3002 implicit_decl_warning (functionid, decl);
3003 C_DECL_IMPLICIT (decl) = 1;
3005 if (DECL_BUILT_IN (decl))
3007 newtype = build_type_attribute_variant (newtype,
3009 (TREE_TYPE (decl)));
3010 if (!comptypes (newtype, TREE_TYPE (decl)))
3012 warning_at (loc, 0, "incompatible implicit declaration of "
3013 "built-in function %qD", decl);
3014 newtype = TREE_TYPE (decl);
3019 if (!comptypes (newtype, TREE_TYPE (decl)))
3021 error_at (loc, "incompatible implicit declaration of function %qD", decl);
3022 locate_old_decl (decl);
3025 b->u.type = TREE_TYPE (decl);
3026 TREE_TYPE (decl) = newtype;
3027 bind (functionid, decl, current_scope,
3028 /*invisible=*/false, /*nested=*/true,
3029 DECL_SOURCE_LOCATION (decl));
3034 /* Not seen before. */
3035 decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type);
3036 DECL_EXTERNAL (decl) = 1;
3037 TREE_PUBLIC (decl) = 1;
3038 C_DECL_IMPLICIT (decl) = 1;
3039 implicit_decl_warning (functionid, 0);
3040 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
3042 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
3044 /* C89 says implicit declarations are in the innermost block.
3045 So we record the decl in the standard fashion. */
3046 decl = pushdecl (decl);
3048 /* No need to call objc_check_decl here - it's a function type. */
3049 rest_of_decl_compilation (decl, 0, 0);
3051 /* Write a record describing this implicit function declaration
3052 to the prototypes file (if requested). */
3053 gen_aux_info_record (decl, 0, 1, 0);
3055 /* Possibly apply some default attributes to this implicit declaration. */
3056 decl_attributes (&decl, NULL_TREE, 0);
3061 /* Issue an error message for a reference to an undeclared variable
3062 ID, including a reference to a builtin outside of function-call
3063 context. Establish a binding of the identifier to error_mark_node
3064 in an appropriate scope, which will suppress further errors for the
3065 same identifier. The error message should be given location LOC. */
3067 undeclared_variable (location_t loc, tree id)
3069 static bool already = false;
3070 struct c_scope *scope;
3072 if (current_function_decl == 0)
3074 error_at (loc, "%qE undeclared here (not in a function)", id);
3075 scope = current_scope;
3079 if (!objc_diagnose_private_ivar (id))
3080 error_at (loc, "%qE undeclared (first use in this function)", id);
3083 inform (loc, "each undeclared identifier is reported only"
3084 " once for each function it appears in");
3088 /* If we are parsing old-style parameter decls, current_function_decl
3089 will be nonnull but current_function_scope will be null. */
3090 scope = current_function_scope ? current_function_scope : current_scope;
3092 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
3096 /* Subroutine of lookup_label, declare_label, define_label: construct a
3097 LABEL_DECL with all the proper frills. Also create a struct
3098 c_label_vars initialized for the current scope. */
3101 make_label (location_t location, tree name, bool defining,
3102 struct c_label_vars **p_label_vars)
3104 tree label = build_decl (location, LABEL_DECL, name, void_type_node);
3105 DECL_CONTEXT (label) = current_function_decl;
3106 DECL_MODE (label) = VOIDmode;
3108 c_label_vars *label_vars = ggc_alloc<c_label_vars> ();
3109 label_vars->shadowed = NULL;
3110 set_spot_bindings (&label_vars->label_bindings, defining);
3111 label_vars->decls_in_scope = make_tree_vector ();
3112 label_vars->gotos = NULL;
3113 *p_label_vars = label_vars;
3118 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3119 Create one if none exists so far for the current function.
3120 This is called when a label is used in a goto expression or
3121 has its address taken. */
3124 lookup_label (tree name)
3127 struct c_label_vars *label_vars;
3129 if (current_function_scope == 0)
3131 error ("label %qE referenced outside of any function", name);
3135 /* Use a label already defined or ref'd with this name, but not if
3136 it is inherited from a containing function and wasn't declared
3138 label = I_LABEL_DECL (name);
3139 if (label && (DECL_CONTEXT (label) == current_function_decl
3140 || C_DECLARED_LABEL_FLAG (label)))
3142 /* If the label has only been declared, update its apparent
3143 location to point here, for better diagnostics if it
3144 turns out not to have been defined. */
3145 if (DECL_INITIAL (label) == NULL_TREE)
3146 DECL_SOURCE_LOCATION (label) = input_location;
3150 /* No label binding for that identifier; make one. */
3151 label = make_label (input_location, name, false, &label_vars);
3153 /* Ordinary labels go in the current function scope. */
3154 bind_label (name, label, current_function_scope, label_vars);
3159 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3163 warn_about_goto (location_t goto_loc, tree label, tree decl)
3165 if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3167 "jump into scope of identifier with variably modified type");
3169 warning_at (goto_loc, OPT_Wjump_misses_init,
3170 "jump skips variable initialization");
3171 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3172 inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl);
3175 /* Look up a label because of a goto statement. This is like
3176 lookup_label, but also issues any appropriate warnings. */
3179 lookup_label_for_goto (location_t loc, tree name)
3182 struct c_label_vars *label_vars;
3186 label = lookup_label (name);
3187 if (label == NULL_TREE)
3190 /* If we are jumping to a different function, we can't issue any
3192 if (DECL_CONTEXT (label) != current_function_decl)
3194 gcc_assert (C_DECLARED_LABEL_FLAG (label));
3198 label_vars = I_LABEL_BINDING (name)->u.label;
3200 /* If the label has not yet been defined, then push this goto on a
3201 list for possible later warnings. */
3202 if (label_vars->label_bindings.scope == NULL)
3204 c_goto_bindings *g = ggc_alloc<c_goto_bindings> ();
3207 set_spot_bindings (&g->goto_bindings, true);
3208 vec_safe_push (label_vars->gotos, g);
3212 /* If there are any decls in label_vars->decls_in_scope, then this
3213 goto has missed the declaration of the decl. This happens for a
3219 Issue a warning or error. */
3220 FOR_EACH_VEC_SAFE_ELT (label_vars->decls_in_scope, ix, decl)
3221 warn_about_goto (loc, label, decl);
3223 if (label_vars->label_bindings.left_stmt_expr)
3225 error_at (loc, "jump into statement expression");
3226 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3232 /* Make a label named NAME in the current function, shadowing silently
3233 any that may be inherited from containing functions or containing
3234 scopes. This is called for __label__ declarations. */
3237 declare_label (tree name)
3239 struct c_binding *b = I_LABEL_BINDING (name);
3241 struct c_label_vars *label_vars;
3243 /* Check to make sure that the label hasn't already been declared
3245 if (b && B_IN_CURRENT_SCOPE (b))
3247 error ("duplicate label declaration %qE", name);
3248 locate_old_decl (b->decl);
3250 /* Just use the previous declaration. */
3254 label = make_label (input_location, name, false, &label_vars);
3255 C_DECLARED_LABEL_FLAG (label) = 1;
3257 /* Declared labels go in the current scope. */
3258 bind_label (name, label, current_scope, label_vars);
3263 /* When we define a label, issue any appropriate warnings if there are
3264 any gotos earlier in the function which jump to this label. */
3267 check_earlier_gotos (tree label, struct c_label_vars* label_vars)
3270 struct c_goto_bindings *g;
3272 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
3274 struct c_binding *b;
3275 struct c_scope *scope;
3277 /* We have a goto to this label. The goto is going forward. In
3278 g->scope, the goto is going to skip any binding which was
3279 defined after g->bindings_in_scope. */
3280 if (g->goto_bindings.scope->has_jump_unsafe_decl)
3282 for (b = g->goto_bindings.scope->bindings;
3283 b != g->goto_bindings.bindings_in_scope;
3286 if (decl_jump_unsafe (b->decl))
3287 warn_about_goto (g->loc, label, b->decl);
3291 /* We also need to warn about decls defined in any scopes
3292 between the scope of the label and the scope of the goto. */
3293 for (scope = label_vars->label_bindings.scope;
3294 scope != g->goto_bindings.scope;
3295 scope = scope->outer)
3297 gcc_assert (scope != NULL);
3298 if (scope->has_jump_unsafe_decl)
3300 if (scope == label_vars->label_bindings.scope)
3301 b = label_vars->label_bindings.bindings_in_scope;
3303 b = scope->bindings;
3304 for (; b != NULL; b = b->prev)
3306 if (decl_jump_unsafe (b->decl))
3307 warn_about_goto (g->loc, label, b->decl);
3312 if (g->goto_bindings.stmt_exprs > 0)
3314 error_at (g->loc, "jump into statement expression");
3315 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here",
3320 /* Now that the label is defined, we will issue warnings about
3321 subsequent gotos to this label when we see them. */
3322 vec_safe_truncate (label_vars->gotos, 0);
3323 label_vars->gotos = NULL;
3326 /* Define a label, specifying the location in the source file.
3327 Return the LABEL_DECL node for the label, if the definition is valid.
3328 Otherwise return 0. */
3331 define_label (location_t location, tree name)
3333 /* Find any preexisting label with this name. It is an error
3334 if that label has already been defined in this function, or
3335 if there is a containing function with a declared label with
3337 tree label = I_LABEL_DECL (name);
3340 && ((DECL_CONTEXT (label) == current_function_decl
3341 && DECL_INITIAL (label) != 0)
3342 || (DECL_CONTEXT (label) != current_function_decl
3343 && C_DECLARED_LABEL_FLAG (label))))
3345 error_at (location, "duplicate label %qD", label);
3346 locate_old_decl (label);
3349 else if (label && DECL_CONTEXT (label) == current_function_decl)
3351 struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label;
3353 /* The label has been used or declared already in this function,
3354 but not defined. Update its location to point to this
3356 DECL_SOURCE_LOCATION (label) = location;
3357 set_spot_bindings (&label_vars->label_bindings, true);
3359 /* Issue warnings as required about any goto statements from
3360 earlier in the function. */
3361 check_earlier_gotos (label, label_vars);
3365 struct c_label_vars *label_vars;
3367 /* No label binding for that identifier; make one. */
3368 label = make_label (location, name, true, &label_vars);
3370 /* Ordinary labels go in the current function scope. */
3371 bind_label (name, label, current_function_scope, label_vars);
3374 if (!in_system_header_at (input_location) && lookup_name (name))
3375 warning_at (location, OPT_Wtraditional,
3376 "traditional C lacks a separate namespace "
3377 "for labels, identifier %qE conflicts", name);
3379 /* Mark label as having been defined. */
3380 DECL_INITIAL (label) = error_mark_node;
3384 /* Get the bindings for a new switch statement. This is used to issue
3385 warnings as appropriate for jumps from the switch to case or
3388 struct c_spot_bindings *
3389 c_get_switch_bindings (void)
3391 struct c_spot_bindings *switch_bindings;
3393 switch_bindings = XNEW (struct c_spot_bindings);
3394 set_spot_bindings (switch_bindings, true);
3395 return switch_bindings;
3399 c_release_switch_bindings (struct c_spot_bindings *bindings)
3401 gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr);
3405 /* This is called at the point of a case or default label to issue
3406 warnings about decls as needed. It returns true if it found an
3407 error, not just a warning. */
3410 c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings,
3411 location_t switch_loc, location_t case_loc)
3414 struct c_scope *scope;
3417 for (scope = current_scope;
3418 scope != switch_bindings->scope;
3419 scope = scope->outer)
3421 struct c_binding *b;
3423 gcc_assert (scope != NULL);
3425 if (!scope->has_jump_unsafe_decl)
3428 for (b = scope->bindings; b != NULL; b = b->prev)
3430 if (decl_jump_unsafe (b->decl))
3432 if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE))
3436 ("switch jumps into scope of identifier with "
3437 "variably modified type"));
3440 warning_at (case_loc, OPT_Wjump_misses_init,
3441 "switch jumps over variable initialization");
3442 inform (switch_loc, "switch starts here");
3443 inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here",
3449 if (switch_bindings->stmt_exprs > 0)
3452 error_at (case_loc, "switch jumps into statement expression");
3453 inform (switch_loc, "switch starts here");
3459 /* Given NAME, an IDENTIFIER_NODE,
3460 return the structure (or union or enum) definition for that name.
3461 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3462 CODE says which kind of type the caller wants;
3463 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3464 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3465 location where the tag was defined.
3466 If the wrong kind of type is found, an error is reported. */
3469 lookup_tag (enum tree_code code, tree name, int thislevel_only,
3472 struct c_binding *b = I_TAG_BINDING (name);
3478 /* We only care about whether it's in this level if
3479 thislevel_only was set or it might be a type clash. */
3480 if (thislevel_only || TREE_CODE (b->decl) != code)
3482 /* For our purposes, a tag in the external scope is the same as
3483 a tag in the file scope. (Primarily relevant to Objective-C
3484 and its builtin structure tags, which get pushed before the
3485 file scope is created.) */
3486 if (B_IN_CURRENT_SCOPE (b)
3487 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
3491 if (thislevel_only && !thislevel)
3494 if (TREE_CODE (b->decl) != code)
3496 /* Definition isn't the kind we were looking for. */
3497 pending_invalid_xref = name;
3498 pending_invalid_xref_location = input_location;
3500 /* If in the same binding level as a declaration as a tag
3501 of a different type, this must not be allowed to
3502 shadow that tag, so give the error immediately.
3503 (For example, "struct foo; union foo;" is invalid.) */
3505 pending_xref_error ();
3514 /* Print an error message now
3515 for a recent invalid struct, union or enum cross reference.
3516 We don't print them immediately because they are not invalid
3517 when used in the `struct foo;' construct for shadowing. */
3520 pending_xref_error (void)
3522 if (pending_invalid_xref != 0)
3523 error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag",
3524 pending_invalid_xref);
3525 pending_invalid_xref = 0;
3529 /* Look up NAME in the current scope and its superiors
3530 in the namespace of variables, functions and typedefs.
3531 Return a ..._DECL node of some kind representing its definition,
3532 or return 0 if it is undefined. */
3535 lookup_name (tree name)
3537 struct c_binding *b = I_SYMBOL_BINDING (name);
3538 if (b && !b->invisible)
3540 maybe_record_typedef_use (b->decl);
3546 /* Similar to `lookup_name' but look only at the indicated scope. */
3549 lookup_name_in_scope (tree name, struct c_scope *scope)
3551 struct c_binding *b;
3553 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
3554 if (B_IN_SCOPE (b, scope))
3559 /* Create the predefined scalar types of C,
3560 and some nodes representing standard constants (0, 1, (void *) 0).
3561 Initialize the global scope.
3562 Make definitions for built-in primitive functions. */
3565 c_init_decl_processing (void)
3567 location_t save_loc = input_location;
3569 /* Initialize reserved words for parser. */
3572 current_function_decl = 0;
3574 gcc_obstack_init (&parser_obstack);
3576 /* Make the externals scope. */
3578 external_scope = current_scope;
3580 /* Declarations from c_common_nodes_and_builtins must not be associated
3581 with this input file, lest we get differences between using and not
3582 using preprocessed headers. */
3583 input_location = BUILTINS_LOCATION;
3585 c_common_nodes_and_builtins ();
3587 /* In C, comparisons and TRUTH_* expressions have type int. */
3588 truthvalue_type_node = integer_type_node;
3589 truthvalue_true_node = integer_one_node;
3590 truthvalue_false_node = integer_zero_node;
3592 /* Even in C99, which has a real boolean type. */
3593 pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"),
3594 boolean_type_node));
3596 input_location = save_loc;
3598 pedantic_lvalues = true;
3600 make_fname_decl = c_make_fname_decl;
3601 start_fname_decls ();
3604 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3605 give the decl, NAME is the initialization string and TYPE_DEP
3606 indicates whether NAME depended on the type of the function. As we
3607 don't yet implement delayed emission of static data, we mark the
3608 decl as emitted so it is not placed in the output. Anything using
3609 it must therefore pull out the STRING_CST initializer directly.
3613 c_make_fname_decl (location_t loc, tree id, int type_dep)
3615 const char *name = fname_as_string (type_dep);
3616 tree decl, type, init;
3617 size_t length = strlen (name);
3619 type = build_array_type (char_type_node,
3620 build_index_type (size_int (length)));
3621 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
3623 decl = build_decl (loc, VAR_DECL, id, type);
3625 TREE_STATIC (decl) = 1;
3626 TREE_READONLY (decl) = 1;
3627 DECL_ARTIFICIAL (decl) = 1;
3629 init = build_string (length + 1, name);
3630 free (CONST_CAST (char *, name));
3631 TREE_TYPE (init) = type;
3632 DECL_INITIAL (decl) = init;
3634 TREE_USED (decl) = 1;
3636 if (current_function_decl
3637 /* For invalid programs like this:
3640 const char* p = __FUNCTION__;
3642 the __FUNCTION__ is believed to appear in K&R style function
3643 parameter declarator. In that case we still don't have
3645 && (!seen_error () || current_function_scope))
3647 DECL_CONTEXT (decl) = current_function_decl;
3648 bind (id, decl, current_function_scope,
3649 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
3652 finish_decl (decl, loc, init, NULL_TREE, NULL_TREE);
3658 c_builtin_function (tree decl)
3660 tree type = TREE_TYPE (decl);
3661 tree id = DECL_NAME (decl);
3663 const char *name = IDENTIFIER_POINTER (id);
3664 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
3666 /* Should never be called on a symbol with a preexisting meaning. */
3667 gcc_assert (!I_SYMBOL_BINDING (id));
3669 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false,
3672 /* Builtins in the implementation namespace are made visible without
3673 needing to be explicitly declared. See push_file_scope. */
3674 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3676 DECL_CHAIN (decl) = visible_builtins;
3677 visible_builtins = decl;
3684 c_builtin_function_ext_scope (tree decl)
3686 tree type = TREE_TYPE (decl);
3687 tree id = DECL_NAME (decl);
3689 const char *name = IDENTIFIER_POINTER (id);
3690 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
3693 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false,
3696 /* Builtins in the implementation namespace are made visible without
3697 needing to be explicitly declared. See push_file_scope. */
3698 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3700 DECL_CHAIN (decl) = visible_builtins;
3701 visible_builtins = decl;
3707 /* Called when a declaration is seen that contains no names to declare.
3708 If its type is a reference to a structure, union or enum inherited
3709 from a containing scope, shadow that tag name for the current scope
3710 with a forward reference.
3711 If its type defines a new named structure or union
3712 or defines an enum, it is valid but we need not do anything here.
3713 Otherwise, it is an error. */
3716 shadow_tag (const struct c_declspecs *declspecs)
3718 shadow_tag_warned (declspecs, 0);
3721 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3724 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
3726 bool found_tag = false;
3728 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
3730 tree value = declspecs->type;
3731 enum tree_code code = TREE_CODE (value);
3733 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3734 /* Used to test also that TYPE_SIZE (value) != 0.
3735 That caused warning for `struct foo;' at top level in the file. */
3737 tree name = TYPE_NAME (value);
3742 if (declspecs->restrict_p)
3744 error ("invalid use of %<restrict%>");
3750 if (warned != 1 && code != ENUMERAL_TYPE)
3751 /* Empty unnamed enum OK */
3753 pedwarn (input_location, 0,
3754 "unnamed struct/union that defines no instances");
3758 else if (declspecs->typespec_kind != ctsk_tagdef
3759 && declspecs->typespec_kind != ctsk_tagfirstref
3760 && declspecs->storage_class != csc_none)
3763 pedwarn (input_location, 0,
3764 "empty declaration with storage class specifier "
3765 "does not redeclare tag");
3767 pending_xref_error ();
3769 else if (declspecs->typespec_kind != ctsk_tagdef
3770 && declspecs->typespec_kind != ctsk_tagfirstref
3771 && (declspecs->const_p
3772 || declspecs->volatile_p
3773 || declspecs->atomic_p
3774 || declspecs->restrict_p
3775 || declspecs->address_space))
3778 pedwarn (input_location, 0,
3779 "empty declaration with type qualifier "
3780 "does not redeclare tag");
3782 pending_xref_error ();
3784 else if (declspecs->typespec_kind != ctsk_tagdef
3785 && declspecs->typespec_kind != ctsk_tagfirstref
3786 && declspecs->alignas_p)
3789 pedwarn (input_location, 0,
3790 "empty declaration with %<_Alignas%> "
3791 "does not redeclare tag");
3793 pending_xref_error ();
3797 pending_invalid_xref = 0;
3798 t = lookup_tag (code, name, 1, NULL);
3802 t = make_node (code);
3803 pushtag (input_location, name, t);
3809 if (warned != 1 && !in_system_header_at (input_location))
3811 pedwarn (input_location, 0,
3812 "useless type name in empty declaration");
3817 else if (warned != 1 && !in_system_header_at (input_location)
3818 && declspecs->typedef_p)
3820 pedwarn (input_location, 0, "useless type name in empty declaration");
3824 pending_invalid_xref = 0;
3826 if (declspecs->inline_p)
3828 error ("%<inline%> in empty declaration");
3832 if (declspecs->noreturn_p)
3834 error ("%<_Noreturn%> in empty declaration");
3838 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
3840 error ("%<auto%> in file-scope empty declaration");
3844 if (current_scope == file_scope && declspecs->storage_class == csc_register)
3846 error ("%<register%> in file-scope empty declaration");
3850 if (!warned && !in_system_header_at (input_location)
3851 && declspecs->storage_class != csc_none)
3853 warning (0, "useless storage class specifier in empty declaration");
3857 if (!warned && !in_system_header_at (input_location) && declspecs->thread_p)
3859 warning (0, "useless %qs in empty declaration",
3860 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
3865 && !in_system_header_at (input_location)
3866 && (declspecs->const_p
3867 || declspecs->volatile_p
3868 || declspecs->atomic_p
3869 || declspecs->restrict_p
3870 || declspecs->address_space))
3872 warning (0, "useless type qualifier in empty declaration");
3876 if (!warned && !in_system_header_at (input_location)
3877 && declspecs->alignas_p)
3879 warning (0, "useless %<_Alignas%> in empty declaration");
3886 pedwarn (input_location, 0, "empty declaration");
3891 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3892 bits. SPECS represents declaration specifiers that the grammar
3893 only permits to contain type qualifiers and attributes. */
3896 quals_from_declspecs (const struct c_declspecs *specs)
3898 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3899 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3900 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0)
3901 | (specs->atomic_p ? TYPE_QUAL_ATOMIC : 0)
3902 | (ENCODE_QUAL_ADDR_SPACE (specs->address_space)));
3903 gcc_assert (!specs->type
3904 && !specs->decl_attr
3905 && specs->typespec_word == cts_none
3906 && specs->storage_class == csc_none
3907 && !specs->typedef_p
3908 && !specs->explicit_signed_p
3909 && !specs->deprecated_p
3911 && !specs->long_long_p
3914 && !specs->unsigned_p
3915 && !specs->complex_p
3917 && !specs->noreturn_p
3918 && !specs->thread_p);
3922 /* Construct an array declarator. LOC is the location of the
3923 beginning of the array (usually the opening brace). EXPR is the
3924 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3925 inside the [] (to be applied to the pointer to which a parameter
3926 array is converted). STATIC_P is true if "static" is inside the
3927 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3928 VLA of unspecified length which is nevertheless a complete type,
3929 false otherwise. The field for the contained declarator is left to
3930 be filled in by set_array_declarator_inner. */
3932 struct c_declarator *
3933 build_array_declarator (location_t loc,
3934 tree expr, struct c_declspecs *quals, bool static_p,
3937 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3938 struct c_declarator);
3939 declarator->id_loc = loc;
3940 declarator->kind = cdk_array;
3941 declarator->declarator = 0;
3942 declarator->u.array.dimen = expr;
3945 declarator->u.array.attrs = quals->attrs;
3946 declarator->u.array.quals = quals_from_declspecs (quals);
3950 declarator->u.array.attrs = NULL_TREE;
3951 declarator->u.array.quals = 0;
3953 declarator->u.array.static_p = static_p;
3954 declarator->u.array.vla_unspec_p = vla_unspec_p;
3957 if (static_p || quals != NULL)
3958 pedwarn (loc, OPT_Wpedantic,
3959 "ISO C90 does not support %<static%> or type "
3960 "qualifiers in parameter array declarators");
3962 pedwarn (loc, OPT_Wpedantic,
3963 "ISO C90 does not support %<[*]%> array declarators");
3967 if (!current_scope->parm_flag)
3970 error_at (loc, "%<[*]%> not allowed in other than "
3971 "function prototype scope");
3972 declarator->u.array.vla_unspec_p = false;
3975 current_scope->had_vla_unspec = true;
3980 /* Set the contained declarator of an array declarator. DECL is the
3981 declarator, as constructed by build_array_declarator; INNER is what
3982 appears on the left of the []. */
3984 struct c_declarator *
3985 set_array_declarator_inner (struct c_declarator *decl,
3986 struct c_declarator *inner)
3988 decl->declarator = inner;
3992 /* INIT is a constructor that forms DECL's initializer. If the final
3993 element initializes a flexible array field, add the size of that
3994 initializer to DECL's size. */
3997 add_flexible_array_elts_to_size (tree decl, tree init)
4001 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init)))
4004 elt = CONSTRUCTOR_ELTS (init)->last ().value;
4005 type = TREE_TYPE (elt);
4006 if (TREE_CODE (type) == ARRAY_TYPE
4007 && TYPE_SIZE (type) == NULL_TREE
4008 && TYPE_DOMAIN (type) != NULL_TREE
4009 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
4011 complete_array_type (&type, elt, false);
4013 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
4014 DECL_SIZE_UNIT (decl)
4015 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
4019 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4020 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4021 before the type name, and set *EXPR_CONST_OPERANDS, if
4022 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4023 appear in a constant expression. */
4026 groktypename (struct c_type_name *type_name, tree *expr,
4027 bool *expr_const_operands)
4030 tree attrs = type_name->specs->attrs;
4032 type_name->specs->attrs = NULL_TREE;
4034 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
4035 false, NULL, &attrs, expr, expr_const_operands,
4038 /* Apply attributes. */
4039 decl_attributes (&type, attrs, 0);
4044 /* Wrapper for decl_attributes that adds some implicit attributes
4045 to VAR_DECLs or FUNCTION_DECLs. */
4048 c_decl_attributes (tree *node, tree attributes, int flags)
4050 /* Add implicit "omp declare target" attribute if requested. */
4051 if (current_omp_declare_target_attribute
4052 && ((TREE_CODE (*node) == VAR_DECL && TREE_STATIC (*node))
4053 || TREE_CODE (*node) == FUNCTION_DECL))
4055 if (TREE_CODE (*node) == VAR_DECL
4056 && ((DECL_CONTEXT (*node)
4057 && TREE_CODE (DECL_CONTEXT (*node)) == FUNCTION_DECL)
4058 || (current_function_decl && !DECL_EXTERNAL (*node))))
4059 error ("%q+D in block scope inside of declare target directive",
4061 else if (TREE_CODE (*node) == VAR_DECL
4062 && !lang_hooks.types.omp_mappable_type (TREE_TYPE (*node)))
4063 error ("%q+D in declare target directive does not have mappable type",
4066 attributes = tree_cons (get_identifier ("omp declare target"),
4067 NULL_TREE, attributes);
4069 return decl_attributes (node, attributes, flags);
4073 /* Decode a declarator in an ordinary declaration or data definition.
4074 This is called as soon as the type information and variable name
4075 have been parsed, before parsing the initializer if any.
4076 Here we create the ..._DECL node, fill in its type,
4077 and put it on the list of decls for the current context.
4078 The ..._DECL node is returned as the value.
4080 Exception: for arrays where the length is not specified,
4081 the type is left null, to be filled in by `finish_decl'.
4083 Function definitions do not come here; they go to start_function
4084 instead. However, external and forward declarations of functions
4085 do go through here. Structure field declarations are done by
4086 grokfield and not through here. */
4089 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
4090 bool initialized, tree attributes)
4094 tree expr = NULL_TREE;
4095 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
4097 /* An object declared as __attribute__((deprecated)) suppresses
4098 warnings of uses of other deprecated items. */
4099 if (lookup_attribute ("deprecated", attributes))
4100 deprecated_state = DEPRECATED_SUPPRESS;
4102 decl = grokdeclarator (declarator, declspecs,
4103 NORMAL, initialized, NULL, &attributes, &expr, NULL,
4109 add_stmt (fold_convert (void_type_node, expr));
4111 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
4112 warning (OPT_Wmain, "%q+D is usually a function", decl);
4115 /* Is it valid for this decl to have an initializer at all?
4116 If not, set INITIALIZED to zero, which will indirectly
4117 tell 'finish_decl' to ignore the initializer once it is parsed. */
4118 switch (TREE_CODE (decl))
4121 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
4126 error ("function %qD is initialized like a variable", decl);
4131 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4132 error ("parameter %qD is initialized", decl);
4137 /* Don't allow initializations for incomplete types except for
4138 arrays which might be completed by the initialization. */
4140 /* This can happen if the array size is an undefined macro.
4141 We already gave a warning, so we don't need another one. */
4142 if (TREE_TYPE (decl) == error_mark_node)
4144 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
4146 /* A complete type is ok if size is fixed. */
4148 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
4149 || C_DECL_VARIABLE_SIZE (decl))
4151 error ("variable-sized object may not be initialized");
4155 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
4157 error ("variable %qD has initializer but incomplete type", decl);
4160 else if (C_DECL_VARIABLE_SIZE (decl))
4162 /* Although C99 is unclear about whether incomplete arrays
4163 of VLAs themselves count as VLAs, it does not make
4164 sense to permit them to be initialized given that
4165 ordinary VLAs may not be initialized. */
4166 error ("variable-sized object may not be initialized");
4173 if (current_scope == file_scope)
4174 TREE_STATIC (decl) = 1;
4176 /* Tell 'pushdecl' this is an initialized decl
4177 even though we don't yet have the initializer expression.
4178 Also tell 'finish_decl' it may store the real initializer. */
4179 DECL_INITIAL (decl) = error_mark_node;
4182 /* If this is a function declaration, write a record describing it to the
4183 prototypes file (if requested). */
4185 if (TREE_CODE (decl) == FUNCTION_DECL)
4186 gen_aux_info_record (decl, 0, 0, prototype_p (TREE_TYPE (decl)));
4188 /* ANSI specifies that a tentative definition which is not merged with
4189 a non-tentative definition behaves exactly like a definition with an
4190 initializer equal to zero. (Section 3.7.2)
4192 -fno-common gives strict ANSI behavior, though this tends to break
4193 a large body of code that grew up without this rule.
4195 Thread-local variables are never common, since there's no entrenched
4196 body of code to break, and it allows more efficient variable references
4197 in the presence of dynamic linking. */
4199 if (TREE_CODE (decl) == VAR_DECL
4201 && TREE_PUBLIC (decl)
4202 && !DECL_THREAD_LOCAL_P (decl)
4204 DECL_COMMON (decl) = 1;
4206 /* Set attributes here so if duplicate decl, will have proper attributes. */
4207 c_decl_attributes (&decl, attributes, 0);
4209 /* Handle gnu_inline attribute. */
4210 if (declspecs->inline_p
4211 && !flag_gnu89_inline
4212 && TREE_CODE (decl) == FUNCTION_DECL
4213 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
4214 || current_function_decl))
4216 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
4218 else if (declspecs->storage_class != csc_static)
4219 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
4222 if (TREE_CODE (decl) == FUNCTION_DECL
4223 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
4225 struct c_declarator *ce = declarator;
4227 if (ce->kind == cdk_pointer)
4228 ce = declarator->declarator;
4229 if (ce->kind == cdk_function)
4231 tree args = ce->u.arg_info->parms;
4232 for (; args; args = DECL_CHAIN (args))
4234 tree type = TREE_TYPE (args);
4235 if (type && INTEGRAL_TYPE_P (type)
4236 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4237 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
4242 if (TREE_CODE (decl) == FUNCTION_DECL
4243 && DECL_DECLARED_INLINE_P (decl)
4244 && DECL_UNINLINABLE (decl)
4245 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4246 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
4249 /* C99 6.7.4p3: An inline definition of a function with external
4250 linkage shall not contain a definition of a modifiable object
4251 with static storage duration... */
4252 if (TREE_CODE (decl) == VAR_DECL
4253 && current_scope != file_scope
4254 && TREE_STATIC (decl)
4255 && !TREE_READONLY (decl)
4256 && DECL_DECLARED_INLINE_P (current_function_decl)
4257 && DECL_EXTERNAL (current_function_decl))
4258 record_inline_static (input_location, current_function_decl,
4259 decl, csi_modifiable);
4261 if (c_dialect_objc ()
4262 && (TREE_CODE (decl) == VAR_DECL
4263 || TREE_CODE (decl) == FUNCTION_DECL))
4264 objc_check_global_decl (decl);
4266 /* Add this decl to the current scope.
4267 TEM may equal DECL or it may be a previous decl of the same name. */
4268 tem = pushdecl (decl);
4270 if (initialized && DECL_EXTERNAL (tem))
4272 DECL_EXTERNAL (tem) = 0;
4273 TREE_STATIC (tem) = 1;
4279 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4280 DECL or the non-array element type if DECL is an uninitialized array.
4281 If that type has a const member, diagnose this. */
4284 diagnose_uninitialized_cst_member (tree decl, tree type)
4287 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
4290 if (TREE_CODE (field) != FIELD_DECL)
4292 field_type = strip_array_types (TREE_TYPE (field));
4294 if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST)
4296 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4297 "uninitialized const member in %qT is invalid in C++",
4298 strip_array_types (TREE_TYPE (decl)));
4299 inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field);
4302 if (TREE_CODE (field_type) == RECORD_TYPE
4303 || TREE_CODE (field_type) == UNION_TYPE)
4304 diagnose_uninitialized_cst_member (decl, field_type);
4308 /* Finish processing of a declaration;
4309 install its initial value.
4310 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4311 If the length of an array type is not known before,
4312 it must be determined now, from the initial value, or it is an error.
4314 INIT_LOC is the location of the initial value. */
4317 finish_decl (tree decl, location_t init_loc, tree init,
4318 tree origtype, tree asmspec_tree)
4321 bool was_incomplete = (DECL_SIZE (decl) == 0);
4322 const char *asmspec = 0;
4324 /* If a name was specified, get the string. */
4325 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4326 && DECL_FILE_SCOPE_P (decl))
4327 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4329 asmspec = TREE_STRING_POINTER (asmspec_tree);
4331 if (TREE_CODE (decl) == VAR_DECL
4332 && TREE_STATIC (decl)
4333 && global_bindings_p ())
4334 /* So decl is a global variable. Record the types it uses
4335 so that we can decide later to emit debug info for them. */
4336 record_types_used_by_current_var_decl (decl);
4338 /* If `start_decl' didn't like having an initialization, ignore it now. */
4339 if (init != 0 && DECL_INITIAL (decl) == 0)
4342 /* Don't crash if parm is initialized. */
4343 if (TREE_CODE (decl) == PARM_DECL)
4347 store_init_value (init_loc, decl, init, origtype);
4349 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
4350 || TREE_CODE (decl) == FUNCTION_DECL
4351 || TREE_CODE (decl) == FIELD_DECL))
4352 objc_check_decl (decl);
4354 type = TREE_TYPE (decl);
4356 /* Deduce size of array from initialization, if not already known. */
4357 if (TREE_CODE (type) == ARRAY_TYPE
4358 && TYPE_DOMAIN (type) == 0
4359 && TREE_CODE (decl) != TYPE_DECL)
4362 = (TREE_STATIC (decl)
4363 /* Even if pedantic, an external linkage array
4364 may have incomplete type at first. */
4365 ? pedantic && !TREE_PUBLIC (decl)
4366 : !DECL_EXTERNAL (decl));
4368 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
4371 /* Get the completed type made by complete_array_type. */
4372 type = TREE_TYPE (decl);
4377 error ("initializer fails to determine size of %q+D", decl);
4382 error ("array size missing in %q+D", decl);
4383 /* If a `static' var's size isn't known,
4384 make it extern as well as static, so it does not get
4386 If it is not `static', then do not mark extern;
4387 finish_incomplete_decl will give it a default size
4388 and it will get allocated. */
4389 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4390 DECL_EXTERNAL (decl) = 1;
4394 error ("zero or negative size array %q+D", decl);
4398 /* For global variables, update the copy of the type that
4399 exists in the binding. */
4400 if (TREE_PUBLIC (decl))
4402 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
4403 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
4404 b_ext = b_ext->shadowed;
4407 if (b_ext->u.type && comptypes (b_ext->u.type, type))
4408 b_ext->u.type = composite_type (b_ext->u.type, type);
4410 b_ext->u.type = type;
4419 if (DECL_INITIAL (decl))
4420 TREE_TYPE (DECL_INITIAL (decl)) = type;
4422 relayout_decl (decl);
4425 if (TREE_CODE (decl) == VAR_DECL)
4427 if (init && TREE_CODE (init) == CONSTRUCTOR)
4428 add_flexible_array_elts_to_size (decl, init);
4430 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
4431 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
4432 layout_decl (decl, 0);
4434 if (DECL_SIZE (decl) == 0
4435 /* Don't give an error if we already gave one earlier. */
4436 && TREE_TYPE (decl) != error_mark_node
4437 && (TREE_STATIC (decl)
4438 /* A static variable with an incomplete type
4439 is an error if it is initialized.
4440 Also if it is not file scope.
4441 Otherwise, let it through, but if it is not `extern'
4442 then it may cause an error message later. */
4443 ? (DECL_INITIAL (decl) != 0
4444 || !DECL_FILE_SCOPE_P (decl))
4445 /* An automatic variable with an incomplete type
4447 : !DECL_EXTERNAL (decl)))
4449 error ("storage size of %q+D isn%'t known", decl);
4450 TREE_TYPE (decl) = error_mark_node;
4453 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4454 && DECL_SIZE (decl) != 0)
4456 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4457 constant_expression_warning (DECL_SIZE (decl));
4460 error ("storage size of %q+D isn%'t constant", decl);
4461 TREE_TYPE (decl) = error_mark_node;
4465 if (TREE_USED (type))
4467 TREE_USED (decl) = 1;
4468 DECL_READ_P (decl) = 1;
4472 /* If this is a function and an assembler name is specified, reset DECL_RTL
4473 so we can give it its new name. Also, update builtin_decl if it
4474 was a normal built-in. */
4475 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4477 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4478 set_builtin_user_assembler_name (decl, asmspec);
4479 set_user_assembler_name (decl, asmspec);
4482 /* If #pragma weak was used, mark the decl weak now. */
4483 maybe_apply_pragma_weak (decl);
4485 /* Output the assembler code and/or RTL code for variables and functions,
4486 unless the type is an undefined structure or union.
4487 If not, it will get done when the type is completed. */
4489 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4491 /* Determine the ELF visibility. */
4492 if (TREE_PUBLIC (decl))
4493 c_determine_visibility (decl);
4495 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4496 if (c_dialect_objc ())
4497 objc_check_decl (decl);
4501 /* If this is not a static variable, issue a warning.
4502 It doesn't make any sense to give an ASMSPEC for an
4503 ordinary, non-register local variable. Historically,
4504 GCC has accepted -- but ignored -- the ASMSPEC in
4506 if (!DECL_FILE_SCOPE_P (decl)
4507 && TREE_CODE (decl) == VAR_DECL
4508 && !C_DECL_REGISTER (decl)
4509 && !TREE_STATIC (decl))
4510 warning (0, "ignoring asm-specifier for non-static local "
4511 "variable %q+D", decl);
4513 set_user_assembler_name (decl, asmspec);
4516 if (DECL_FILE_SCOPE_P (decl))
4518 if (DECL_INITIAL (decl) == NULL_TREE
4519 || DECL_INITIAL (decl) == error_mark_node)
4520 /* Don't output anything
4521 when a tentative file-scope definition is seen.
4522 But at end of compilation, do output code for them. */
4523 DECL_DEFER_OUTPUT (decl) = 1;
4524 if (asmspec && C_DECL_REGISTER (decl))
4525 DECL_HARD_REGISTER (decl) = 1;
4526 rest_of_decl_compilation (decl, true, 0);
4530 /* In conjunction with an ASMSPEC, the `register'
4531 keyword indicates that we should place the variable
4532 in a particular register. */
4533 if (asmspec && C_DECL_REGISTER (decl))
4535 DECL_HARD_REGISTER (decl) = 1;
4536 /* This cannot be done for a structure with volatile
4537 fields, on which DECL_REGISTER will have been
4539 if (!DECL_REGISTER (decl))
4540 error ("cannot put object with volatile field into register");
4543 if (TREE_CODE (decl) != FUNCTION_DECL)
4545 /* If we're building a variable sized type, and we might be
4546 reachable other than via the top of the current binding
4547 level, then create a new BIND_EXPR so that we deallocate
4548 the object at the right time. */
4549 /* Note that DECL_SIZE can be null due to errors. */
4550 if (DECL_SIZE (decl)
4551 && !TREE_CONSTANT (DECL_SIZE (decl))
4552 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
4555 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
4556 TREE_SIDE_EFFECTS (bind) = 1;
4558 BIND_EXPR_BODY (bind) = push_stmt_list ();
4560 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
4566 if (!DECL_FILE_SCOPE_P (decl))
4568 /* Recompute the RTL of a local array now
4569 if it used to be an incomplete type. */
4571 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
4573 /* If we used it already as memory, it must stay in memory. */
4574 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4575 /* If it's still incomplete now, no init will save it. */
4576 if (DECL_SIZE (decl) == 0)
4577 DECL_INITIAL (decl) = 0;
4582 if (TREE_CODE (decl) == TYPE_DECL)
4584 if (!DECL_FILE_SCOPE_P (decl)
4585 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
4586 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
4588 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
4591 /* Install a cleanup (aka destructor) if one was given. */
4592 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
4594 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
4597 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
4598 tree cleanup_decl = lookup_name (cleanup_id);
4600 vec<tree, va_gc> *v;
4602 /* Build "cleanup(&decl)" for the destructor. */
4603 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
4605 v->quick_push (cleanup);
4606 cleanup = c_build_function_call_vec (DECL_SOURCE_LOCATION (decl),
4607 vNULL, cleanup_decl, v, NULL);
4610 /* Don't warn about decl unused; the cleanup uses it. */
4611 TREE_USED (decl) = 1;
4612 TREE_USED (cleanup_decl) = 1;
4613 DECL_READ_P (decl) = 1;
4615 push_cleanup (decl, cleanup, false);
4620 && TREE_CODE (decl) == VAR_DECL
4621 && !DECL_EXTERNAL (decl)
4622 && DECL_INITIAL (decl) == NULL_TREE)
4624 type = strip_array_types (type);
4625 if (TREE_READONLY (decl))
4626 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4627 "uninitialized const %qD is invalid in C++", decl);
4628 else if ((TREE_CODE (type) == RECORD_TYPE
4629 || TREE_CODE (type) == UNION_TYPE)
4630 && C_TYPE_FIELDS_READONLY (type))
4631 diagnose_uninitialized_cst_member (decl, type);
4634 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
4637 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4638 EXPR is NULL or a pointer to an expression that needs to be
4639 evaluated for the side effects of array size expressions in the
4643 grokparm (const struct c_parm *parm, tree *expr)
4645 tree attrs = parm->attrs;
4646 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
4647 NULL, &attrs, expr, NULL, DEPRECATED_NORMAL);
4649 decl_attributes (&decl, attrs, 0);
4654 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4655 and push that on the current scope. EXPR is a pointer to an
4656 expression that needs to be evaluated for the side effects of array
4657 size expressions in the parameters. */
4660 push_parm_decl (const struct c_parm *parm, tree *expr)
4662 tree attrs = parm->attrs;
4665 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
4666 &attrs, expr, NULL, DEPRECATED_NORMAL);
4667 decl_attributes (&decl, attrs, 0);
4669 decl = pushdecl (decl);
4671 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
4674 /* Mark all the parameter declarations to date as forward decls.
4675 Also diagnose use of this extension. */
4678 mark_forward_parm_decls (void)
4680 struct c_binding *b;
4682 if (pedantic && !current_scope->warned_forward_parm_decls)
4684 pedwarn (input_location, OPT_Wpedantic,
4685 "ISO C forbids forward parameter declarations");
4686 current_scope->warned_forward_parm_decls = true;
4689 for (b = current_scope->bindings; b; b = b->prev)
4690 if (TREE_CODE (b->decl) == PARM_DECL)
4691 TREE_ASM_WRITTEN (b->decl) = 1;
4694 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4695 literal, which may be an incomplete array type completed by the
4696 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4697 literal. NON_CONST is true if the initializers contain something
4698 that cannot occur in a constant expression. */
4701 build_compound_literal (location_t loc, tree type, tree init, bool non_const)
4703 /* We do not use start_decl here because we have a type, not a declarator;
4704 and do not use finish_decl because the decl should be stored inside
4705 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4710 if (type == error_mark_node
4711 || init == error_mark_node)
4712 return error_mark_node;
4714 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
4715 DECL_EXTERNAL (decl) = 0;
4716 TREE_PUBLIC (decl) = 0;
4717 TREE_STATIC (decl) = (current_scope == file_scope);
4718 DECL_CONTEXT (decl) = current_function_decl;
4719 TREE_USED (decl) = 1;
4720 DECL_READ_P (decl) = 1;
4721 TREE_TYPE (decl) = type;
4722 TREE_READONLY (decl) = (TYPE_READONLY (type)
4723 || (TREE_CODE (type) == ARRAY_TYPE
4724 && TYPE_READONLY (TREE_TYPE (type))));
4725 store_init_value (loc, decl, init, NULL_TREE);
4727 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4729 int failure = complete_array_type (&TREE_TYPE (decl),
4730 DECL_INITIAL (decl), true);
4731 /* If complete_array_type returns 3, it means that the
4732 initial value of the compound literal is empty. Allow it. */
4733 gcc_assert (failure == 0 || failure == 3);
4735 type = TREE_TYPE (decl);
4736 TREE_TYPE (DECL_INITIAL (decl)) = type;
4739 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
4741 c_incomplete_type_error (NULL_TREE, type);
4742 return error_mark_node;
4745 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
4746 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
4747 TREE_SIDE_EFFECTS (complit) = 1;
4749 layout_decl (decl, 0);
4751 if (TREE_STATIC (decl))
4753 /* This decl needs a name for the assembler output. */
4754 set_compound_literal_name (decl);
4755 DECL_DEFER_OUTPUT (decl) = 1;
4756 DECL_COMDAT (decl) = 1;
4757 DECL_ARTIFICIAL (decl) = 1;
4758 DECL_IGNORED_P (decl) = 1;
4760 rest_of_decl_compilation (decl, 1, 0);
4765 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
4766 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
4772 /* Check the type of a compound literal. Here we just check that it
4773 is valid for C++. */
4776 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
4779 && (type_name->specs->typespec_kind == ctsk_tagdef
4780 || type_name->specs->typespec_kind == ctsk_tagfirstref))
4781 warning_at (loc, OPT_Wc___compat,
4782 "defining a type in a compound literal is invalid in C++");
4785 /* Determine whether TYPE is a structure with a flexible array member,
4786 or a union containing such a structure (possibly recursively). */
4789 flexible_array_type_p (tree type)
4792 switch (TREE_CODE (type))
4795 x = TYPE_FIELDS (type);
4798 while (DECL_CHAIN (x) != NULL_TREE)
4800 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
4801 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
4802 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
4803 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
4807 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x))
4809 if (flexible_array_type_p (TREE_TYPE (x)))
4818 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4819 replacing with appropriate values if they are invalid. */
4821 check_bitfield_type_and_width (tree *type, tree *width, tree orig_name)
4824 unsigned int max_width;
4825 unsigned HOST_WIDE_INT w;
4826 const char *name = (orig_name
4827 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
4828 : _("<anonymous>"));
4830 /* Detect and ignore out of range field width and process valid
4832 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)))
4834 error ("bit-field %qs width not an integer constant", name);
4835 *width = integer_one_node;
4839 if (TREE_CODE (*width) != INTEGER_CST)
4841 *width = c_fully_fold (*width, false, NULL);
4842 if (TREE_CODE (*width) == INTEGER_CST)
4843 pedwarn (input_location, OPT_Wpedantic,
4844 "bit-field %qs width not an integer constant expression",
4847 if (TREE_CODE (*width) != INTEGER_CST)
4849 error ("bit-field %qs width not an integer constant", name);
4850 *width = integer_one_node;
4852 constant_expression_warning (*width);
4853 if (tree_int_cst_sgn (*width) < 0)
4855 error ("negative width in bit-field %qs", name);
4856 *width = integer_one_node;
4858 else if (integer_zerop (*width) && orig_name)
4860 error ("zero width for bit-field %qs", name);
4861 *width = integer_one_node;
4865 /* Detect invalid bit-field type. */
4866 if (TREE_CODE (*type) != INTEGER_TYPE
4867 && TREE_CODE (*type) != BOOLEAN_TYPE
4868 && TREE_CODE (*type) != ENUMERAL_TYPE)
4870 error ("bit-field %qs has invalid type", name);
4871 *type = unsigned_type_node;
4874 type_mv = TYPE_MAIN_VARIANT (*type);
4875 if (!in_system_header_at (input_location)
4876 && type_mv != integer_type_node
4877 && type_mv != unsigned_type_node
4878 && type_mv != boolean_type_node
4880 pedwarn (input_location, OPT_Wpedantic,
4881 "type of bit-field %qs is a GCC extension", name);
4883 max_width = TYPE_PRECISION (*type);
4885 if (0 < compare_tree_int (*width, max_width))
4887 error ("width of %qs exceeds its type", name);
4889 *width = build_int_cst (integer_type_node, w);
4892 w = tree_to_uhwi (*width);
4894 if (TREE_CODE (*type) == ENUMERAL_TYPE)
4896 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
4898 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_SIGN (*type))
4899 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_SIGN (*type)))
4900 warning (0, "%qs is narrower than values of its type", name);
4906 /* Print warning about variable length array if necessary. */
4909 warn_variable_length_array (tree name, tree size)
4911 int const_size = TREE_CONSTANT (size);
4913 if (!flag_isoc99 && pedantic && warn_vla != 0)
4918 pedwarn (input_location, OPT_Wvla,
4919 "ISO C90 forbids array %qE whose size "
4920 "can%'t be evaluated",
4923 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size "
4924 "can%'t be evaluated");
4929 pedwarn (input_location, OPT_Wvla,
4930 "ISO C90 forbids variable length array %qE",
4933 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array");
4936 else if (warn_vla > 0)
4942 "the size of array %qE can"
4943 "%'t be evaluated", name);
4946 "the size of array can %'t be evaluated");
4952 "variable length array %qE is used",
4956 "variable length array is used");
4961 /* Given declspecs and a declarator,
4962 determine the name and type of the object declared
4963 and construct a ..._DECL node for it.
4964 (In one case we can return a ..._TYPE node instead.
4965 For invalid input we sometimes return 0.)
4967 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4969 DECL_CONTEXT says which syntactic context this declaration is in:
4970 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4971 FUNCDEF for a function definition. Like NORMAL but a few different
4972 error messages in each case. Return value may be zero meaning
4973 this definition is too screwy to try to parse.
4974 PARM for a parameter declaration (either within a function prototype
4975 or before a function body). Make a PARM_DECL, or return void_type_node.
4976 TYPENAME if for a typename (in a cast or sizeof).
4977 Don't make a DECL node; just return the ..._TYPE node.
4978 FIELD for a struct or union field; make a FIELD_DECL.
4979 INITIALIZED is true if the decl has an initializer.
4980 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4981 representing the width of the bit-field.
4982 DECL_ATTRS points to the list of attributes that should be added to this
4983 decl. Any nested attributes that belong on the decl itself will be
4985 If EXPR is not NULL, any expressions that need to be evaluated as
4986 part of evaluating variably modified types will be stored in *EXPR.
4987 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4988 set to indicate whether operands in *EXPR can be used in constant
4990 DEPRECATED_STATE is a deprecated_states value indicating whether
4991 deprecation warnings should be suppressed.
4993 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4994 It may also be so in the PARM case, for a prototype where the
4995 argument type is specified but not the name.
4997 This function is where the complicated C meanings of `static'
4998 and `extern' are interpreted. */
5001 grokdeclarator (const struct c_declarator *declarator,
5002 struct c_declspecs *declspecs,
5003 enum decl_context decl_context, bool initialized, tree *width,
5004 tree *decl_attrs, tree *expr, bool *expr_const_operands,
5005 enum deprecated_states deprecated_state)
5007 tree type = declspecs->type;
5008 bool threadp = declspecs->thread_p;
5009 enum c_storage_class storage_class = declspecs->storage_class;
5014 int type_quals = TYPE_UNQUALIFIED;
5015 tree name = NULL_TREE;
5016 bool funcdef_flag = false;
5017 bool funcdef_syntax = false;
5018 bool size_varies = false;
5019 tree decl_attr = declspecs->decl_attr;
5020 int array_ptr_quals = TYPE_UNQUALIFIED;
5021 tree array_ptr_attrs = NULL_TREE;
5022 int array_parm_static = 0;
5023 bool array_parm_vla_unspec_p = false;
5024 tree returned_attrs = NULL_TREE;
5025 bool bitfield = width != NULL;
5027 struct c_arg_info *arg_info = 0;
5028 addr_space_t as1, as2, address_space;
5029 location_t loc = UNKNOWN_LOCATION;
5032 bool expr_const_operands_dummy;
5033 enum c_declarator_kind first_non_attr_kind;
5034 unsigned int alignas_align = 0;
5036 if (TREE_CODE (type) == ERROR_MARK)
5037 return error_mark_node;
5040 if (expr_const_operands == NULL)
5041 expr_const_operands = &expr_const_operands_dummy;
5043 *expr = declspecs->expr;
5044 *expr_const_operands = declspecs->expr_const_operands;
5046 if (decl_context == FUNCDEF)
5047 funcdef_flag = true, decl_context = NORMAL;
5049 /* Look inside a declarator for the name being declared
5050 and get it as an IDENTIFIER_NODE, for an error message. */
5052 const struct c_declarator *decl = declarator;
5054 first_non_attr_kind = cdk_attrs;
5064 funcdef_syntax = (decl->kind == cdk_function);
5065 decl = decl->declarator;
5066 if (first_non_attr_kind == cdk_attrs)
5067 first_non_attr_kind = decl->kind;
5071 decl = decl->declarator;
5078 if (first_non_attr_kind == cdk_attrs)
5079 first_non_attr_kind = decl->kind;
5088 gcc_assert (decl_context == PARM
5089 || decl_context == TYPENAME
5090 || (decl_context == FIELD
5091 && declarator->kind == cdk_id));
5092 gcc_assert (!initialized);
5096 /* A function definition's declarator must have the form of
5097 a function declarator. */
5099 if (funcdef_flag && !funcdef_syntax)
5102 /* If this looks like a function definition, make it one,
5103 even if it occurs where parms are expected.
5104 Then store_parm_decls will reject it and not use it as a parm. */
5105 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
5106 decl_context = PARM;
5108 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
5109 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
5111 if ((decl_context == NORMAL || decl_context == FIELD)
5112 && current_scope == file_scope
5113 && variably_modified_type_p (type, NULL_TREE))
5116 error_at (loc, "variably modified %qE at file scope", name);
5118 error_at (loc, "variably modified field at file scope");
5119 type = integer_type_node;
5122 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
5124 /* Diagnose defaulting to "int". */
5126 if (declspecs->default_int_p && !in_system_header_at (input_location))
5128 /* Issue a warning if this is an ISO C 99 program or if
5129 -Wreturn-type and this is a function, or if -Wimplicit;
5130 prefer the former warning since it is more explicit. */
5131 if ((warn_implicit_int || warn_return_type || flag_isoc99)
5133 warn_about_return_type = 1;
5137 pedwarn_c99 (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int,
5138 "type defaults to %<int%> in declaration of %qE",
5141 pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int,
5142 "type defaults to %<int%> in type name");
5146 /* Adjust the type if a bit-field is being declared,
5147 -funsigned-bitfields applied and the type is not explicitly
5149 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
5150 && TREE_CODE (type) == INTEGER_TYPE)
5151 type = unsigned_type_for (type);
5153 /* Figure out the type qualifiers for the declaration. There are
5154 two ways a declaration can become qualified. One is something
5155 like `const int i' where the `const' is explicit. Another is
5156 something like `typedef const int CI; CI i' where the type of the
5157 declaration contains the `const'. A third possibility is that
5158 there is a type qualifier on the element type of a typedefed
5159 array type, in which case we should extract that qualifier so
5160 that c_apply_type_quals_to_decl receives the full list of
5161 qualifiers to work with (C90 is not entirely clear about whether
5162 duplicate qualifiers should be diagnosed in this case, but it
5163 seems most appropriate to do so). */
5164 element_type = strip_array_types (type);
5165 constp = declspecs->const_p + TYPE_READONLY (element_type);
5166 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
5167 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
5168 atomicp = declspecs->atomic_p + TYPE_ATOMIC (element_type);
5169 as1 = declspecs->address_space;
5170 as2 = TYPE_ADDR_SPACE (element_type);
5171 address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1;
5173 if (pedantic && !flag_isoc99)
5176 pedwarn (loc, OPT_Wpedantic, "duplicate %<const%>");
5178 pedwarn (loc, OPT_Wpedantic, "duplicate %<restrict%>");
5180 pedwarn (loc, OPT_Wpedantic, "duplicate %<volatile%>");
5182 pedwarn (loc, OPT_Wpedantic, "duplicate %<_Atomic%>");
5186 if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2)
5187 error_at (loc, "conflicting named address spaces (%s vs %s)",
5188 c_addr_space_name (as1), c_addr_space_name (as2));
5190 if ((TREE_CODE (type) == ARRAY_TYPE
5191 || first_non_attr_kind == cdk_array)
5192 && TYPE_QUALS (element_type))
5193 type = TYPE_MAIN_VARIANT (type);
5194 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
5195 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
5196 | (volatilep ? TYPE_QUAL_VOLATILE : 0)
5197 | (atomicp ? TYPE_QUAL_ATOMIC : 0)
5198 | ENCODE_QUAL_ADDR_SPACE (address_space));
5200 /* Applying the _Atomic qualifier to an array type (through the use
5201 of typedefs or typeof) must be detected here. If the qualifier
5202 is introduced later, any appearance of applying it to an array is
5203 actually applying it to an element of that array. */
5204 if (atomicp && TREE_CODE (type) == ARRAY_TYPE)
5205 error_at (loc, "%<_Atomic%>-qualified array type");
5207 /* Warn about storage classes that are invalid for certain
5208 kinds of declarations (parameters, typenames, etc.). */
5212 || storage_class == csc_auto
5213 || storage_class == csc_register
5214 || storage_class == csc_typedef))
5216 if (storage_class == csc_auto)
5218 (current_scope == file_scope) ? 0 : OPT_Wpedantic,
5219 "function definition declared %<auto%>");
5220 if (storage_class == csc_register)
5221 error_at (loc, "function definition declared %<register%>");
5222 if (storage_class == csc_typedef)
5223 error_at (loc, "function definition declared %<typedef%>");
5225 error_at (loc, "function definition declared %qs",
5226 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
5228 if (storage_class == csc_auto
5229 || storage_class == csc_register
5230 || storage_class == csc_typedef)
5231 storage_class = csc_none;
5233 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
5235 if (decl_context == PARM && storage_class == csc_register)
5239 switch (decl_context)
5243 error_at (loc, "storage class specified for structure "
5246 error_at (loc, "storage class specified for structure field");
5250 error_at (loc, "storage class specified for parameter %qE",
5253 error_at (loc, "storage class specified for unnamed parameter");
5256 error_at (loc, "storage class specified for typename");
5259 storage_class = csc_none;
5263 else if (storage_class == csc_extern
5267 /* 'extern' with initialization is invalid if not at file scope. */
5268 if (current_scope == file_scope)
5270 /* It is fine to have 'extern const' when compiling at C
5271 and C++ intersection. */
5272 if (!(warn_cxx_compat && constp))
5273 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
5277 error_at (loc, "%qE has both %<extern%> and initializer", name);
5279 else if (current_scope == file_scope)
5281 if (storage_class == csc_auto)
5282 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
5284 if (pedantic && storage_class == csc_register)
5285 pedwarn (input_location, OPT_Wpedantic,
5286 "file-scope declaration of %qE specifies %<register%>", name);
5290 if (storage_class == csc_extern && funcdef_flag)
5291 error_at (loc, "nested function %qE declared %<extern%>", name);
5292 else if (threadp && storage_class == csc_none)
5294 error_at (loc, "function-scope %qE implicitly auto and declared "
5296 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
5301 /* Now figure out the structure of the declarator proper.
5302 Descend through it, creating more complex types, until we reach
5303 the declared identifier (or NULL_TREE, in an absolute declarator).
5304 At each stage we maintain an unqualified version of the type
5305 together with any qualifiers that should be applied to it with
5306 c_build_qualified_type; this way, array types including
5307 multidimensional array types are first built up in unqualified
5308 form and then the qualified form is created with
5309 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5311 while (declarator && declarator->kind != cdk_id)
5313 if (type == error_mark_node)
5315 declarator = declarator->declarator;
5319 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5320 a cdk_pointer (for *...),
5321 a cdk_function (for ...(...)),
5322 a cdk_attrs (for nested attributes),
5323 or a cdk_id (for the name being declared
5324 or the place in an absolute declarator
5325 where the name was omitted).
5326 For the last case, we have just exited the loop.
5328 At this point, TYPE is the type of elements of an array,
5329 or for a function to return, or for a pointer to point to.
5330 After this sequence of ifs, TYPE is the type of the
5331 array or function or pointer, and DECLARATOR has had its
5332 outermost layer removed. */
5334 if (array_ptr_quals != TYPE_UNQUALIFIED
5335 || array_ptr_attrs != NULL_TREE
5336 || array_parm_static)
5338 /* Only the innermost declarator (making a parameter be of
5339 array type which is converted to pointer type)
5340 may have static or type qualifiers. */
5341 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5342 array_ptr_quals = TYPE_UNQUALIFIED;
5343 array_ptr_attrs = NULL_TREE;
5344 array_parm_static = 0;
5347 switch (declarator->kind)
5351 /* A declarator with embedded attributes. */
5352 tree attrs = declarator->u.attrs;
5353 const struct c_declarator *inner_decl;
5355 declarator = declarator->declarator;
5356 inner_decl = declarator;
5357 while (inner_decl->kind == cdk_attrs)
5358 inner_decl = inner_decl->declarator;
5359 if (inner_decl->kind == cdk_id)
5360 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
5361 else if (inner_decl->kind == cdk_function)
5362 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
5363 else if (inner_decl->kind == cdk_array)
5364 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
5365 returned_attrs = decl_attributes (&type,
5366 chainon (returned_attrs, attrs),
5372 tree itype = NULL_TREE;
5373 tree size = declarator->u.array.dimen;
5374 /* The index is a signed object `sizetype' bits wide. */
5375 tree index_type = c_common_signed_type (sizetype);
5377 array_ptr_quals = declarator->u.array.quals;
5378 array_ptr_attrs = declarator->u.array.attrs;
5379 array_parm_static = declarator->u.array.static_p;
5380 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
5382 declarator = declarator->declarator;
5384 /* Check for some types that there cannot be arrays of. */
5386 if (VOID_TYPE_P (type))
5389 error_at (loc, "declaration of %qE as array of voids", name);
5391 error_at (loc, "declaration of type name as array of voids");
5392 type = error_mark_node;
5395 if (TREE_CODE (type) == FUNCTION_TYPE)
5398 error_at (loc, "declaration of %qE as array of functions",
5401 error_at (loc, "declaration of type name as array of "
5403 type = error_mark_node;
5406 if (pedantic && !in_system_header_at (input_location)
5407 && flexible_array_type_p (type))
5408 pedwarn (loc, OPT_Wpedantic,
5409 "invalid use of structure with flexible array member");
5411 if (size == error_mark_node)
5412 type = error_mark_node;
5414 if (type == error_mark_node)
5417 /* If size was specified, set ITYPE to a range-type for
5418 that size. Otherwise, ITYPE remains null. finish_decl
5419 may figure it out from an initial value. */
5423 bool size_maybe_const = true;
5424 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
5425 && !TREE_OVERFLOW (size));
5426 bool this_size_varies = false;
5428 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5430 STRIP_TYPE_NOPS (size);
5432 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
5435 error_at (loc, "size of array %qE has non-integer type",
5439 "size of unnamed array has non-integer type");
5440 size = integer_one_node;
5443 size = c_fully_fold (size, false, &size_maybe_const);
5445 if (pedantic && size_maybe_const && integer_zerop (size))
5448 pedwarn (loc, OPT_Wpedantic,
5449 "ISO C forbids zero-size array %qE", name);
5451 pedwarn (loc, OPT_Wpedantic,
5452 "ISO C forbids zero-size array");
5455 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
5457 constant_expression_warning (size);
5458 if (tree_int_cst_sgn (size) < 0)
5461 error_at (loc, "size of array %qE is negative", name);
5463 error_at (loc, "size of unnamed array is negative");
5464 size = integer_one_node;
5466 /* Handle a size folded to an integer constant but
5467 not an integer constant expression. */
5468 if (!size_int_const)
5470 /* If this is a file scope declaration of an
5471 ordinary identifier, this is invalid code;
5472 diagnosing it here and not subsequently
5473 treating the type as variable-length avoids
5474 more confusing diagnostics later. */
5475 if ((decl_context == NORMAL || decl_context == FIELD)
5476 && current_scope == file_scope)
5477 pedwarn (input_location, 0,
5478 "variably modified %qE at file scope",
5481 this_size_varies = size_varies = true;
5482 warn_variable_length_array (name, size);
5485 else if ((decl_context == NORMAL || decl_context == FIELD)
5486 && current_scope == file_scope)
5488 error_at (loc, "variably modified %qE at file scope", name);
5489 size = integer_one_node;
5493 /* Make sure the array size remains visibly
5494 nonconstant even if it is (eg) a const variable
5495 with known value. */
5496 this_size_varies = size_varies = true;
5497 warn_variable_length_array (name, size);
5498 if (flag_sanitize & SANITIZE_VLA
5499 && decl_context == NORMAL)
5501 /* Evaluate the array size only once. */
5502 size = c_save_expr (size);
5503 size = c_fully_fold (size, false, NULL);
5504 size = fold_build2 (COMPOUND_EXPR, TREE_TYPE (size),
5505 ubsan_instrument_vla (loc, size),
5510 if (integer_zerop (size) && !this_size_varies)
5512 /* A zero-length array cannot be represented with
5513 an unsigned index type, which is what we'll
5514 get with build_index_type. Create an
5515 open-ended range instead. */
5516 itype = build_range_type (sizetype, size, NULL_TREE);
5520 /* Arrange for the SAVE_EXPR on the inside of the
5521 MINUS_EXPR, which allows the -1 to get folded
5522 with the +1 that happens when building TYPE_SIZE. */
5524 size = save_expr (size);
5525 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
5526 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5527 integer_zero_node, size);
5529 /* Compute the maximum valid index, that is, size
5530 - 1. Do the calculation in index_type, so that
5531 if it is a variable the computations will be
5532 done in the proper mode. */
5533 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
5534 convert (index_type, size),
5535 convert (index_type,
5538 /* The above overflows when size does not fit
5540 ??? While a size of INT_MAX+1 technically shouldn't
5541 cause an overflow (because we subtract 1), handling
5542 this case seems like an unnecessary complication. */
5543 if (TREE_CODE (size) == INTEGER_CST
5544 && !int_fits_type_p (size, index_type))
5547 error_at (loc, "size of array %qE is too large",
5550 error_at (loc, "size of unnamed array is too large");
5551 type = error_mark_node;
5555 itype = build_index_type (itype);
5557 if (this_size_varies)
5560 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5564 *expr_const_operands &= size_maybe_const;
5567 else if (decl_context == FIELD)
5569 bool flexible_array_member = false;
5570 if (array_parm_vla_unspec_p)
5571 /* Field names can in fact have function prototype
5572 scope so [*] is disallowed here through making
5573 the field variably modified, not through being
5574 something other than a declaration with function
5579 const struct c_declarator *t = declarator;
5580 while (t->kind == cdk_attrs)
5582 flexible_array_member = (t->kind == cdk_id);
5584 if (flexible_array_member
5585 && pedantic && !flag_isoc99
5586 && !in_system_header_at (input_location))
5587 pedwarn (loc, OPT_Wpedantic,
5588 "ISO C90 does not support flexible array members");
5590 /* ISO C99 Flexible array members are effectively
5591 identical to GCC's zero-length array extension. */
5592 if (flexible_array_member || array_parm_vla_unspec_p)
5593 itype = build_range_type (sizetype, size_zero_node,
5596 else if (decl_context == PARM)
5598 if (array_parm_vla_unspec_p)
5600 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
5604 else if (decl_context == TYPENAME)
5606 if (array_parm_vla_unspec_p)
5609 warning (0, "%<[*]%> not in a declaration");
5610 /* We use this to avoid messing up with incomplete
5611 array types of the same type, that would
5612 otherwise be modified below. */
5613 itype = build_range_type (sizetype, size_zero_node,
5619 /* Complain about arrays of incomplete types. */
5620 if (!COMPLETE_TYPE_P (type))
5622 error_at (loc, "array type has incomplete element type");
5623 type = error_mark_node;
5626 /* When itype is NULL, a shared incomplete array type is
5627 returned for all array of a given type. Elsewhere we
5628 make sure we don't complete that type before copying
5629 it, but here we want to make sure we don't ever
5630 modify the shared type, so we gcc_assert (itype)
5633 addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals);
5634 if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type))
5635 type = build_qualified_type (type,
5636 ENCODE_QUAL_ADDR_SPACE (as));
5638 type = build_array_type (type, itype);
5641 if (type != error_mark_node)
5645 /* It is ok to modify type here even if itype is
5646 NULL: if size_varies, we're in a
5647 multi-dimensional array and the inner type has
5648 variable size, so the enclosing shared array type
5650 if (size && TREE_CODE (size) == INTEGER_CST)
5652 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5653 C_TYPE_VARIABLE_SIZE (type) = 1;
5656 /* The GCC extension for zero-length arrays differs from
5657 ISO flexible array members in that sizeof yields
5659 if (size && integer_zerop (size))
5662 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5663 TYPE_SIZE (type) = bitsize_zero_node;
5664 TYPE_SIZE_UNIT (type) = size_zero_node;
5665 SET_TYPE_STRUCTURAL_EQUALITY (type);
5667 if (array_parm_vla_unspec_p)
5670 /* The type is complete. C99 6.7.5.2p4 */
5671 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5672 TYPE_SIZE (type) = bitsize_zero_node;
5673 TYPE_SIZE_UNIT (type) = size_zero_node;
5674 SET_TYPE_STRUCTURAL_EQUALITY (type);
5678 if (decl_context != PARM
5679 && (array_ptr_quals != TYPE_UNQUALIFIED
5680 || array_ptr_attrs != NULL_TREE
5681 || array_parm_static))
5683 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5684 array_ptr_quals = TYPE_UNQUALIFIED;
5685 array_ptr_attrs = NULL_TREE;
5686 array_parm_static = 0;
5692 /* Say it's a definition only for the declarator closest
5693 to the identifier, apart possibly from some
5695 bool really_funcdef = false;
5699 const struct c_declarator *t = declarator->declarator;
5700 while (t->kind == cdk_attrs)
5702 really_funcdef = (t->kind == cdk_id);
5705 /* Declaring a function type. Make sure we have a valid
5706 type for the function to return. */
5707 if (type == error_mark_node)
5710 size_varies = false;
5712 /* Warn about some types functions can't return. */
5713 if (TREE_CODE (type) == FUNCTION_TYPE)
5716 error_at (loc, "%qE declared as function returning a "
5719 error_at (loc, "type name declared as function "
5720 "returning a function");
5721 type = integer_type_node;
5723 if (TREE_CODE (type) == ARRAY_TYPE)
5726 error_at (loc, "%qE declared as function returning an array",
5729 error_at (loc, "type name declared as function returning "
5731 type = integer_type_node;
5733 errmsg = targetm.invalid_return_type (type);
5737 type = integer_type_node;
5740 /* Construct the function type and go to the next
5741 inner layer of declarator. */
5742 arg_info = declarator->u.arg_info;
5743 arg_types = grokparms (arg_info, really_funcdef);
5745 /* Type qualifiers before the return type of the function
5746 qualify the return type, not the function type. */
5749 /* Type qualifiers on a function return type are
5750 normally permitted by the standard but have no
5751 effect, so give a warning at -Wreturn-type.
5752 Qualifiers on a void return type are banned on
5753 function definitions in ISO C; GCC used to used
5754 them for noreturn functions. */
5755 if (VOID_TYPE_P (type) && really_funcdef)
5757 "function definition has qualified void return type");
5759 warning_at (loc, OPT_Wignored_qualifiers,
5760 "type qualifiers ignored on function return type");
5762 type = c_build_qualified_type (type, type_quals);
5764 type_quals = TYPE_UNQUALIFIED;
5766 type = build_function_type (type, arg_types);
5767 declarator = declarator->declarator;
5769 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5770 the formal parameter list of this FUNCTION_TYPE to point to
5771 the FUNCTION_TYPE node itself. */
5776 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
5777 TYPE_CONTEXT (tag->type) = type;
5783 /* Merge any constancy or volatility into the target type
5785 if ((type_quals & TYPE_QUAL_ATOMIC)
5786 && TREE_CODE (type) == FUNCTION_TYPE)
5789 "%<_Atomic%>-qualified function type");
5790 type_quals &= ~TYPE_QUAL_ATOMIC;
5792 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5794 pedwarn (loc, OPT_Wpedantic,
5795 "ISO C forbids qualified function types");
5797 type = c_build_qualified_type (type, type_quals);
5798 size_varies = false;
5800 /* When the pointed-to type involves components of variable size,
5801 care must be taken to ensure that the size evaluation code is
5802 emitted early enough to dominate all the possible later uses
5803 and late enough for the variables on which it depends to have
5806 This is expected to happen automatically when the pointed-to
5807 type has a name/declaration of it's own, but special attention
5808 is required if the type is anonymous.
5810 We handle the NORMAL and FIELD contexts here by attaching an
5811 artificial TYPE_DECL to such pointed-to type. This forces the
5812 sizes evaluation at a safe point and ensures it is not deferred
5813 until e.g. within a deeper conditional context.
5815 We expect nothing to be needed here for PARM or TYPENAME.
5816 Pushing a TYPE_DECL at this point for TYPENAME would actually
5817 be incorrect, as we might be in the middle of an expression
5818 with side effects on the pointed-to type size "arguments" prior
5819 to the pointer declaration point and the fake TYPE_DECL in the
5820 enclosing context would force the size evaluation prior to the
5823 if (!TYPE_NAME (type)
5824 && (decl_context == NORMAL || decl_context == FIELD)
5825 && variably_modified_type_p (type, NULL_TREE))
5827 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
5828 DECL_ARTIFICIAL (decl) = 1;
5830 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
5831 TYPE_NAME (type) = decl;
5834 type = c_build_pointer_type (type);
5836 /* Process type qualifiers (such as const or volatile)
5837 that were given inside the `*'. */
5838 type_quals = declarator->u.pointer_quals;
5840 declarator = declarator->declarator;
5847 *decl_attrs = chainon (returned_attrs, *decl_attrs);
5849 /* Now TYPE has the actual type, apart from any qualifiers in
5852 /* Warn about address space used for things other than static memory or
5854 address_space = DECODE_QUAL_ADDR_SPACE (type_quals);
5855 if (!ADDR_SPACE_GENERIC_P (address_space))
5857 if (decl_context == NORMAL)
5859 switch (storage_class)
5862 error ("%qs combined with %<auto%> qualifier for %qE",
5863 c_addr_space_name (address_space), name);
5866 error ("%qs combined with %<register%> qualifier for %qE",
5867 c_addr_space_name (address_space), name);
5870 if (current_function_scope)
5872 error ("%qs specified for auto variable %qE",
5873 c_addr_space_name (address_space), name);
5885 else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE)
5888 error ("%qs specified for parameter %qE",
5889 c_addr_space_name (address_space), name);
5891 error ("%qs specified for unnamed parameter",
5892 c_addr_space_name (address_space));
5894 else if (decl_context == FIELD)
5897 error ("%qs specified for structure field %qE",
5898 c_addr_space_name (address_space), name);
5900 error ("%qs specified for structure field",
5901 c_addr_space_name (address_space));
5905 /* Check the type and width of a bit-field. */
5908 check_bitfield_type_and_width (&type, width, name);
5909 /* C11 makes it implementation-defined (6.7.2.1#5) whether
5910 atomic types are permitted for bit-fields; we have no code to
5911 make bit-field accesses atomic, so disallow them. */
5912 if (type_quals & TYPE_QUAL_ATOMIC)
5915 error ("bit-field %qE has atomic type", name);
5917 error ("bit-field has atomic type");
5918 type_quals &= ~TYPE_QUAL_ATOMIC;
5922 /* Reject invalid uses of _Alignas. */
5923 if (declspecs->alignas_p)
5925 if (storage_class == csc_typedef)
5926 error_at (loc, "alignment specified for typedef %qE", name);
5927 else if (storage_class == csc_register)
5928 error_at (loc, "alignment specified for %<register%> object %qE",
5930 else if (decl_context == PARM)
5933 error_at (loc, "alignment specified for parameter %qE", name);
5935 error_at (loc, "alignment specified for unnamed parameter");
5940 error_at (loc, "alignment specified for bit-field %qE", name);
5942 error_at (loc, "alignment specified for unnamed bit-field");
5944 else if (TREE_CODE (type) == FUNCTION_TYPE)
5945 error_at (loc, "alignment specified for function %qE", name);
5946 else if (declspecs->align_log != -1)
5948 alignas_align = 1U << declspecs->align_log;
5949 if (alignas_align < min_align_of_type (type))
5952 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
5953 "alignment of %qE", name);
5955 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
5956 "alignment of unnamed field");
5962 /* Did array size calculations overflow or does the array cover more
5963 than half of the address-space? */
5964 if (TREE_CODE (type) == ARRAY_TYPE
5965 && COMPLETE_TYPE_P (type)
5966 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
5967 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type)))
5970 error_at (loc, "size of array %qE is too large", name);
5972 error_at (loc, "size of unnamed array is too large");
5973 /* If we proceed with the array type as it is, we'll eventually
5974 crash in tree_to_[su]hwi(). */
5975 type = error_mark_node;
5978 /* If this is declaring a typedef name, return a TYPE_DECL. */
5980 if (storage_class == csc_typedef)
5983 if ((type_quals & TYPE_QUAL_ATOMIC)
5984 && TREE_CODE (type) == FUNCTION_TYPE)
5987 "%<_Atomic%>-qualified function type");
5988 type_quals &= ~TYPE_QUAL_ATOMIC;
5990 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5992 pedwarn (loc, OPT_Wpedantic,
5993 "ISO C forbids qualified function types");
5995 type = c_build_qualified_type (type, type_quals);
5996 decl = build_decl (declarator->id_loc,
5997 TYPE_DECL, declarator->u.id, type);
5998 if (declspecs->explicit_signed_p)
5999 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
6000 if (declspecs->inline_p)
6001 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
6002 if (declspecs->noreturn_p)
6003 pedwarn (loc, 0,"typedef %q+D declared %<_Noreturn%>", decl);
6005 if (warn_cxx_compat && declarator->u.id != NULL_TREE)
6007 struct c_binding *b = I_TAG_BINDING (declarator->u.id);
6010 && b->decl != NULL_TREE
6011 && (B_IN_CURRENT_SCOPE (b)
6012 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
6013 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
6015 warning_at (declarator->id_loc, OPT_Wc___compat,
6016 ("using %qD as both a typedef and a tag is "
6019 if (b->locus != UNKNOWN_LOCATION)
6020 inform (b->locus, "originally defined here");
6027 /* If this is a type name (such as, in a cast or sizeof),
6028 compute the type and return it now. */
6030 if (decl_context == TYPENAME)
6032 /* Note that the grammar rejects storage classes in typenames
6034 gcc_assert (storage_class == csc_none && !threadp
6035 && !declspecs->inline_p && !declspecs->noreturn_p);
6036 if ((type_quals & TYPE_QUAL_ATOMIC)
6037 && TREE_CODE (type) == FUNCTION_TYPE)
6040 "%<_Atomic%>-qualified function type");
6041 type_quals &= ~TYPE_QUAL_ATOMIC;
6043 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
6045 pedwarn (loc, OPT_Wpedantic,
6046 "ISO C forbids const or volatile function types");
6048 type = c_build_qualified_type (type, type_quals);
6052 if (pedantic && decl_context == FIELD
6053 && variably_modified_type_p (type, NULL_TREE))
6056 pedwarn (loc, OPT_Wpedantic, "a member of a structure or union cannot "
6057 "have a variably modified type");
6060 /* Aside from typedefs and type names (handle above),
6061 `void' at top level (not within pointer)
6062 is allowed only in public variables.
6063 We don't complain about parms either, but that is because
6064 a better error message can be made later. */
6066 if (VOID_TYPE_P (type) && decl_context != PARM
6067 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
6068 && (storage_class == csc_extern
6069 || (current_scope == file_scope
6070 && !(storage_class == csc_static
6071 || storage_class == csc_register)))))
6073 error_at (loc, "variable or field %qE declared void", name);
6074 type = integer_type_node;
6077 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6078 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6083 if (decl_context == PARM)
6087 /* A parameter declared as an array of T is really a pointer to T.
6088 One declared as a function is really a pointer to a function. */
6090 if (TREE_CODE (type) == ARRAY_TYPE)
6092 /* Transfer const-ness of array into that of type pointed to. */
6093 type = TREE_TYPE (type);
6095 type = c_build_qualified_type (type, type_quals);
6096 type = c_build_pointer_type (type);
6097 type_quals = array_ptr_quals;
6099 type = c_build_qualified_type (type, type_quals);
6101 /* We don't yet implement attributes in this context. */
6102 if (array_ptr_attrs != NULL_TREE)
6103 warning_at (loc, OPT_Wattributes,
6104 "attributes in parameter array declarator ignored");
6106 size_varies = false;
6108 else if (TREE_CODE (type) == FUNCTION_TYPE)
6110 if (type_quals & TYPE_QUAL_ATOMIC)
6113 "%<_Atomic%>-qualified function type");
6114 type_quals &= ~TYPE_QUAL_ATOMIC;
6116 else if (type_quals)
6117 pedwarn (loc, OPT_Wpedantic,
6118 "ISO C forbids qualified function types");
6120 type = c_build_qualified_type (type, type_quals);
6121 type = c_build_pointer_type (type);
6122 type_quals = TYPE_UNQUALIFIED;
6124 else if (type_quals)
6125 type = c_build_qualified_type (type, type_quals);
6127 decl = build_decl (declarator->id_loc,
6128 PARM_DECL, declarator->u.id, type);
6130 C_DECL_VARIABLE_SIZE (decl) = 1;
6132 /* Compute the type actually passed in the parmlist,
6133 for the case where there is no prototype.
6134 (For example, shorts and chars are passed as ints.)
6135 When there is a prototype, this is overridden later. */
6137 if (type == error_mark_node)
6138 promoted_type = type;
6140 promoted_type = c_type_promotes_to (type);
6142 DECL_ARG_TYPE (decl) = promoted_type;
6143 if (declspecs->inline_p)
6144 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
6145 if (declspecs->noreturn_p)
6146 pedwarn (loc, 0, "parameter %q+D declared %<_Noreturn%>", decl);
6148 else if (decl_context == FIELD)
6150 /* Note that the grammar rejects storage classes in typenames
6152 gcc_assert (storage_class == csc_none && !threadp
6153 && !declspecs->inline_p && !declspecs->noreturn_p);
6155 /* Structure field. It may not be a function. */
6157 if (TREE_CODE (type) == FUNCTION_TYPE)
6159 error_at (loc, "field %qE declared as a function", name);
6160 type = build_pointer_type (type);
6162 else if (TREE_CODE (type) != ERROR_MARK
6163 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
6166 error_at (loc, "field %qE has incomplete type", name);
6168 error_at (loc, "unnamed field has incomplete type");
6169 type = error_mark_node;
6171 type = c_build_qualified_type (type, type_quals);
6172 decl = build_decl (declarator->id_loc,
6173 FIELD_DECL, declarator->u.id, type);
6174 DECL_NONADDRESSABLE_P (decl) = bitfield;
6175 if (bitfield && !declarator->u.id)
6176 TREE_NO_WARNING (decl) = 1;
6179 C_DECL_VARIABLE_SIZE (decl) = 1;
6181 else if (TREE_CODE (type) == FUNCTION_TYPE)
6183 if (storage_class == csc_register || threadp)
6185 error_at (loc, "invalid storage class for function %qE", name);
6187 else if (current_scope != file_scope)
6189 /* Function declaration not at file scope. Storage
6190 classes other than `extern' are not allowed, C99
6191 6.7.1p5, and `extern' makes no difference. However,
6192 GCC allows 'auto', perhaps with 'inline', to support
6193 nested functions. */
6194 if (storage_class == csc_auto)
6195 pedwarn (loc, OPT_Wpedantic,
6196 "invalid storage class for function %qE", name);
6197 else if (storage_class == csc_static)
6199 error_at (loc, "invalid storage class for function %qE", name);
6201 storage_class = declspecs->storage_class = csc_none;
6207 decl = build_decl (declarator->id_loc,
6208 FUNCTION_DECL, declarator->u.id, type);
6209 decl = build_decl_attribute_variant (decl, decl_attr);
6211 if (type_quals & TYPE_QUAL_ATOMIC)
6214 "%<_Atomic%>-qualified function type");
6215 type_quals &= ~TYPE_QUAL_ATOMIC;
6217 else if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
6218 pedwarn (loc, OPT_Wpedantic,
6219 "ISO C forbids qualified function types");
6221 /* Every function declaration is an external reference
6222 (DECL_EXTERNAL) except for those which are not at file
6223 scope and are explicitly declared "auto". This is
6224 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6225 GCC to signify a forward declaration of a nested function. */
6226 if (storage_class == csc_auto && current_scope != file_scope)
6227 DECL_EXTERNAL (decl) = 0;
6228 /* In C99, a function which is declared 'inline' with 'extern'
6229 is not an external reference (which is confusing). It
6230 means that the later definition of the function must be output
6231 in this file, C99 6.7.4p6. In GNU C89, a function declared
6232 'extern inline' is an external reference. */
6233 else if (declspecs->inline_p && storage_class != csc_static)
6234 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
6235 == flag_gnu89_inline);
6237 DECL_EXTERNAL (decl) = !initialized;
6239 /* Record absence of global scope for `static' or `auto'. */
6241 = !(storage_class == csc_static || storage_class == csc_auto);
6243 /* For a function definition, record the argument information
6244 block where store_parm_decls will look for it. */
6246 current_function_arg_info = arg_info;
6248 if (declspecs->default_int_p)
6249 C_FUNCTION_IMPLICIT_INT (decl) = 1;
6251 /* Record presence of `inline' and `_Noreturn', if it is
6253 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
6255 if (declspecs->inline_p)
6256 pedwarn (loc, 0, "cannot inline function %<main%>");
6257 if (declspecs->noreturn_p)
6258 pedwarn (loc, 0, "%<main%> declared %<_Noreturn%>");
6262 if (declspecs->inline_p)
6263 /* Record that the function is declared `inline'. */
6264 DECL_DECLARED_INLINE_P (decl) = 1;
6265 if (declspecs->noreturn_p)
6270 pedwarn (loc, OPT_Wpedantic,
6271 "ISO C99 does not support %<_Noreturn%>");
6273 pedwarn (loc, OPT_Wpedantic,
6274 "ISO C90 does not support %<_Noreturn%>");
6276 TREE_THIS_VOLATILE (decl) = 1;
6282 /* It's a variable. */
6283 /* An uninitialized decl with `extern' is a reference. */
6284 int extern_ref = !initialized && storage_class == csc_extern;
6286 type = c_build_qualified_type (type, type_quals);
6288 /* C99 6.2.2p7: It is invalid (compile-time undefined
6289 behavior) to create an 'extern' declaration for a
6290 variable if there is a global declaration that is
6291 'static' and the global declaration is not visible.
6292 (If the static declaration _is_ currently visible,
6293 the 'extern' declaration is taken to refer to that decl.) */
6294 if (extern_ref && current_scope != file_scope)
6296 tree global_decl = identifier_global_value (declarator->u.id);
6297 tree visible_decl = lookup_name (declarator->u.id);
6300 && global_decl != visible_decl
6301 && TREE_CODE (global_decl) == VAR_DECL
6302 && !TREE_PUBLIC (global_decl))
6303 error_at (loc, "variable previously declared %<static%> "
6304 "redeclared %<extern%>");
6307 decl = build_decl (declarator->id_loc,
6308 VAR_DECL, declarator->u.id, type);
6310 C_DECL_VARIABLE_SIZE (decl) = 1;
6312 if (declspecs->inline_p)
6313 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
6314 if (declspecs->noreturn_p)
6315 pedwarn (loc, 0, "variable %q+D declared %<_Noreturn%>", decl);
6317 /* At file scope, an initialized extern declaration may follow
6318 a static declaration. In that case, DECL_EXTERNAL will be
6319 reset later in start_decl. */
6320 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
6322 /* At file scope, the presence of a `static' or `register' storage
6323 class specifier, or the absence of all storage class specifiers
6324 makes this declaration a definition (perhaps tentative). Also,
6325 the absence of `static' makes it public. */
6326 if (current_scope == file_scope)
6328 TREE_PUBLIC (decl) = storage_class != csc_static;
6329 TREE_STATIC (decl) = !extern_ref;
6331 /* Not at file scope, only `static' makes a static definition. */
6334 TREE_STATIC (decl) = (storage_class == csc_static);
6335 TREE_PUBLIC (decl) = extern_ref;
6339 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6342 if ((storage_class == csc_extern
6343 || (storage_class == csc_none
6344 && TREE_CODE (type) == FUNCTION_TYPE
6346 && variably_modified_type_p (type, NULL_TREE))
6349 if (TREE_CODE (type) == FUNCTION_TYPE)
6350 error_at (loc, "non-nested function with variably modified type");
6352 error_at (loc, "object with variably modified type must have "
6356 /* Record `register' declaration for warnings on &
6357 and in case doing stupid register allocation. */
6359 if (storage_class == csc_register)
6361 C_DECL_REGISTER (decl) = 1;
6362 DECL_REGISTER (decl) = 1;
6365 /* Record constancy and volatility. */
6366 c_apply_type_quals_to_decl (type_quals, decl);
6368 /* Apply _Alignas specifiers. */
6371 DECL_ALIGN (decl) = alignas_align * BITS_PER_UNIT;
6372 DECL_USER_ALIGN (decl) = 1;
6375 /* If a type has volatile components, it should be stored in memory.
6376 Otherwise, the fact that those components are volatile
6377 will be ignored, and would even crash the compiler.
6378 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6379 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
6380 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
6381 || TREE_CODE (decl) == RESULT_DECL))
6383 /* It is not an error for a structure with volatile fields to
6384 be declared register, but reset DECL_REGISTER since it
6385 cannot actually go in a register. */
6386 int was_reg = C_DECL_REGISTER (decl);
6387 C_DECL_REGISTER (decl) = 0;
6388 DECL_REGISTER (decl) = 0;
6389 c_mark_addressable (decl);
6390 C_DECL_REGISTER (decl) = was_reg;
6393 /* This is the earliest point at which we might know the assembler
6394 name of a variable. Thus, if it's known before this, die horribly. */
6395 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
6398 && TREE_CODE (decl) == VAR_DECL
6399 && TREE_PUBLIC (decl)
6400 && TREE_STATIC (decl)
6401 && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
6402 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
6403 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
6404 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
6405 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
6406 ("non-local variable %qD with anonymous type is "
6407 "questionable in C++"),
6414 /* Decode the parameter-list info for a function type or function definition.
6415 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6416 if there is an identifier list instead of a parameter decl list).
6417 These two functions are separate because when a function returns
6418 or receives functions then each is called multiple times but the order
6419 of calls is different. The last call to `grokparms' is always the one
6420 that contains the formal parameter names of a function definition.
6422 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6424 FUNCDEF_FLAG is true for a function definition, false for
6425 a mere declaration. A nonempty identifier-list gets an error message
6426 when FUNCDEF_FLAG is false. */
6429 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
6431 tree arg_types = arg_info->types;
6433 if (funcdef_flag && arg_info->had_vla_unspec)
6435 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6437 error ("%<[*]%> not allowed in other than function prototype scope");
6440 if (arg_types == 0 && !funcdef_flag
6441 && !in_system_header_at (input_location))
6442 warning (OPT_Wstrict_prototypes,
6443 "function declaration isn%'t a prototype");
6445 if (arg_types == error_mark_node)
6446 return 0; /* don't set TYPE_ARG_TYPES in this case */
6448 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
6452 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
6453 arg_info->parms = NULL_TREE;
6456 arg_info->parms = arg_info->types;
6458 arg_info->types = 0;
6463 tree parm, type, typelt;
6464 unsigned int parmno;
6467 /* If there is a parameter of incomplete type in a definition,
6468 this is an error. In a declaration this is valid, and a
6469 struct or union type may be completed later, before any calls
6470 or definition of the function. In the case where the tag was
6471 first declared within the parameter list, a warning has
6472 already been given. If a parameter has void type, then
6473 however the function cannot be defined or called, so
6476 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
6478 parm = DECL_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
6480 type = TREE_VALUE (typelt);
6481 if (type == error_mark_node)
6484 if (!COMPLETE_TYPE_P (type))
6488 if (DECL_NAME (parm))
6489 error_at (input_location,
6490 "parameter %u (%q+D) has incomplete type",
6493 error_at (DECL_SOURCE_LOCATION (parm),
6494 "parameter %u has incomplete type",
6497 TREE_VALUE (typelt) = error_mark_node;
6498 TREE_TYPE (parm) = error_mark_node;
6499 arg_types = NULL_TREE;
6501 else if (VOID_TYPE_P (type))
6503 if (DECL_NAME (parm))
6504 warning_at (input_location, 0,
6505 "parameter %u (%q+D) has void type",
6508 warning_at (DECL_SOURCE_LOCATION (parm), 0,
6509 "parameter %u has void type",
6514 errmsg = targetm.invalid_parameter_type (type);
6518 TREE_VALUE (typelt) = error_mark_node;
6519 TREE_TYPE (parm) = error_mark_node;
6520 arg_types = NULL_TREE;
6523 if (DECL_NAME (parm) && TREE_USED (parm))
6524 warn_if_shadowing (parm);
6530 /* Allocate and initialize a c_arg_info structure from the parser's
6534 build_arg_info (void)
6536 struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info);
6537 ret->parms = NULL_TREE;
6539 ret->types = NULL_TREE;
6540 ret->others = NULL_TREE;
6541 ret->pending_sizes = NULL;
6542 ret->had_vla_unspec = 0;
6546 /* Take apart the current scope and return a c_arg_info structure with
6547 info on a parameter list just parsed.
6549 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6551 ELLIPSIS being true means the argument list ended in '...' so don't
6552 append a sentinel (void_list_node) to the end of the type-list.
6554 EXPR is NULL or an expression that needs to be evaluated for the
6555 side effects of array size expressions in the parameters. */
6558 get_parm_info (bool ellipsis, tree expr)
6560 struct c_binding *b = current_scope->bindings;
6561 struct c_arg_info *arg_info = build_arg_info ();
6564 vec<c_arg_tag, va_gc> *tags = NULL;
6568 static bool explained_incomplete_types = false;
6569 bool gave_void_only_once_err = false;
6571 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
6573 /* The bindings in this scope must not get put into a block.
6574 We will take care of deleting the binding nodes. */
6575 current_scope->bindings = 0;
6577 /* This function is only called if there was *something* on the
6581 /* A parameter list consisting solely of 'void' indicates that the
6582 function takes no arguments. But if the 'void' is qualified
6583 (by 'const' or 'volatile'), or has a storage class specifier
6584 ('register'), then the behavior is undefined; issue an error.
6585 Typedefs for 'void' are OK (see DR#157). */
6586 if (b->prev == 0 /* one binding */
6587 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
6588 && !DECL_NAME (b->decl) /* anonymous */
6589 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
6591 if (TYPE_QUALS (TREE_TYPE (b->decl)) != TYPE_UNQUALIFIED
6592 || C_DECL_REGISTER (b->decl))
6593 error ("%<void%> as only parameter may not be qualified");
6595 /* There cannot be an ellipsis. */
6597 error ("%<void%> must be the only parameter");
6599 arg_info->types = void_list_node;
6604 types = void_list_node;
6606 /* Break up the bindings list into parms, tags, types, and others;
6607 apply sanity checks; purge the name-to-decl bindings. */
6610 tree decl = b->decl;
6611 tree type = TREE_TYPE (decl);
6613 const char *keyword;
6615 switch (TREE_CODE (decl))
6620 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6621 I_SYMBOL_BINDING (b->id) = b->shadowed;
6624 /* Check for forward decls that never got their actual decl. */
6625 if (TREE_ASM_WRITTEN (decl))
6626 error ("parameter %q+D has just a forward declaration", decl);
6627 /* Check for (..., void, ...) and issue an error. */
6628 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
6630 if (!gave_void_only_once_err)
6632 error ("%<void%> must be the only parameter");
6633 gave_void_only_once_err = true;
6638 /* Valid parameter, add it to the list. */
6639 DECL_CHAIN (decl) = parms;
6642 /* Since there is a prototype, args are passed in their
6643 declared types. The back end may override this later. */
6644 DECL_ARG_TYPE (decl) = type;
6645 types = tree_cons (0, type, types);
6649 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
6650 case UNION_TYPE: keyword = "union"; goto tag;
6651 case RECORD_TYPE: keyword = "struct"; goto tag;
6653 /* Types may not have tag-names, in which case the type
6654 appears in the bindings list with b->id NULL. */
6657 gcc_assert (I_TAG_BINDING (b->id) == b);
6658 I_TAG_BINDING (b->id) = b->shadowed;
6661 /* Warn about any struct, union or enum tags defined in a
6662 parameter list. The scope of such types is limited to
6663 the parameter list, which is rarely if ever desirable
6664 (it's impossible to call such a function with type-
6665 correct arguments). An anonymous union parm type is
6666 meaningful as a GNU extension, so don't warn for that. */
6667 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
6670 /* The %s will be one of 'struct', 'union', or 'enum'. */
6671 warning (0, "%<%s %E%> declared inside parameter list",
6674 /* The %s will be one of 'struct', 'union', or 'enum'. */
6675 warning (0, "anonymous %s declared inside parameter list",
6678 if (!explained_incomplete_types)
6680 warning (0, "its scope is only this definition or declaration,"
6681 " which is probably not what you want");
6682 explained_incomplete_types = true;
6688 vec_safe_push (tags, tag);
6694 /* CONST_DECLs appear here when we have an embedded enum,
6695 and TYPE_DECLs appear here when we have an embedded struct
6696 or union. No warnings for this - we already warned about the
6697 type itself. FUNCTION_DECLs appear when there is an implicit
6698 function declaration in the parameter list. */
6700 /* When we reinsert this decl in the function body, we need
6701 to reconstruct whether it was marked as nested. */
6702 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6705 DECL_CHAIN (decl) = others;
6710 /* error_mark_node appears here when we have an undeclared
6711 variable. Just throw it away. */
6714 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6715 I_SYMBOL_BINDING (b->id) = b->shadowed;
6719 /* Other things that might be encountered. */
6726 b = free_binding_and_advance (b);
6729 arg_info->parms = parms;
6730 arg_info->tags = tags;
6731 arg_info->types = types;
6732 arg_info->others = others;
6733 arg_info->pending_sizes = expr;
6737 /* Get the struct, enum or union (CODE says which) with tag NAME.
6738 Define the tag as a forward-reference with location LOC if it is
6739 not defined. Return a c_typespec structure for the type
6743 parser_xref_tag (location_t loc, enum tree_code code, tree name)
6745 struct c_typespec ret;
6749 ret.expr = NULL_TREE;
6750 ret.expr_const_operands = true;
6752 /* If a cross reference is requested, look up the type
6753 already defined for this tag and return it. */
6755 ref = lookup_tag (code, name, 0, &refloc);
6756 /* If this is the right type of tag, return what we found.
6757 (This reference will be shadowed by shadow_tag later if appropriate.)
6758 If this is the wrong type of tag, do not return it. If it was the
6759 wrong type in the same scope, we will have had an error
6760 message already; if in a different scope and declaring
6761 a name, pending_xref_error will give an error message; but if in a
6762 different scope and not declaring a name, this tag should
6763 shadow the previous declaration of a different type of tag, and
6764 this would not work properly if we return the reference found.
6765 (For example, with "struct foo" in an outer scope, "union foo;"
6766 must shadow that tag with a new one of union type.) */
6767 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
6768 if (ref && TREE_CODE (ref) == code)
6770 if (C_TYPE_DEFINED_IN_STRUCT (ref)
6771 && loc != UNKNOWN_LOCATION
6777 warning_at (loc, OPT_Wc___compat,
6778 ("enum type defined in struct or union "
6779 "is not visible in C++"));
6780 inform (refloc, "enum type defined here");
6783 warning_at (loc, OPT_Wc___compat,
6784 ("struct defined in struct or union "
6785 "is not visible in C++"));
6786 inform (refloc, "struct defined here");
6789 warning_at (loc, OPT_Wc___compat,
6790 ("union defined in struct or union "
6791 "is not visible in C++"));
6792 inform (refloc, "union defined here");
6803 /* If no such tag is yet defined, create a forward-reference node
6804 and record it as the "definition".
6805 When a real declaration of this type is found,
6806 the forward-reference will be altered into a real type. */
6808 ref = make_node (code);
6809 if (code == ENUMERAL_TYPE)
6811 /* Give the type a default layout like unsigned int
6812 to avoid crashing if it does not get defined. */
6813 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
6814 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
6815 TYPE_USER_ALIGN (ref) = 0;
6816 TYPE_UNSIGNED (ref) = 1;
6817 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
6818 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
6819 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
6822 pushtag (loc, name, ref);
6828 /* Get the struct, enum or union (CODE says which) with tag NAME.
6829 Define the tag as a forward-reference if it is not defined.
6830 Return a tree for the type. */
6833 xref_tag (enum tree_code code, tree name)
6835 return parser_xref_tag (input_location, code, name).spec;
6838 /* Make sure that the tag NAME is defined *in the current scope*
6839 at least as a forward reference.
6840 LOC is the location of the struct's definition.
6841 CODE says which kind of tag NAME ought to be.
6843 This stores the current value of the file static STRUCT_PARSE_INFO
6844 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6845 new c_struct_parse_info structure. The old value of
6846 STRUCT_PARSE_INFO is restored in finish_struct. */
6849 start_struct (location_t loc, enum tree_code code, tree name,
6850 struct c_struct_parse_info **enclosing_struct_parse_info)
6852 /* If there is already a tag defined at this scope
6853 (as a forward reference), just return it. */
6855 tree ref = NULL_TREE;
6856 location_t refloc = UNKNOWN_LOCATION;
6858 if (name != NULL_TREE)
6859 ref = lookup_tag (code, name, 1, &refloc);
6860 if (ref && TREE_CODE (ref) == code)
6862 if (TYPE_SIZE (ref))
6864 if (code == UNION_TYPE)
6865 error_at (loc, "redefinition of %<union %E%>", name);
6867 error_at (loc, "redefinition of %<struct %E%>", name);
6868 if (refloc != UNKNOWN_LOCATION)
6869 inform (refloc, "originally defined here");
6870 /* Don't create structures using a name already in use. */
6873 else if (C_TYPE_BEING_DEFINED (ref))
6875 if (code == UNION_TYPE)
6876 error_at (loc, "nested redefinition of %<union %E%>", name);
6878 error_at (loc, "nested redefinition of %<struct %E%>", name);
6879 /* Don't bother to report "originally defined here" for a
6880 nested redefinition; the original definition should be
6882 /* Don't create structures that contain themselves. */
6887 /* Otherwise create a forward-reference just so the tag is in scope. */
6889 if (ref == NULL_TREE || TREE_CODE (ref) != code)
6891 ref = make_node (code);
6892 pushtag (loc, name, ref);
6895 C_TYPE_BEING_DEFINED (ref) = 1;
6896 TYPE_PACKED (ref) = flag_pack_struct;
6898 *enclosing_struct_parse_info = struct_parse_info;
6899 struct_parse_info = XNEW (struct c_struct_parse_info);
6900 struct_parse_info->struct_types.create (0);
6901 struct_parse_info->fields.create (0);
6902 struct_parse_info->typedefs_seen.create (0);
6904 /* FIXME: This will issue a warning for a use of a type defined
6905 within a statement expr used within sizeof, et. al. This is not
6906 terribly serious as C++ doesn't permit statement exprs within
6908 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
6909 warning_at (loc, OPT_Wc___compat,
6910 "defining type in %qs expression is invalid in C++",
6913 : (in_typeof ? "typeof" : "alignof")));
6918 /* Process the specs, declarator and width (NULL if omitted)
6919 of a structure component, returning a FIELD_DECL node.
6920 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6921 DECL_ATTRS is as for grokdeclarator.
6923 LOC is the location of the structure component.
6925 This is done during the parsing of the struct declaration.
6926 The FIELD_DECL nodes are chained together and the lot of them
6927 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6930 grokfield (location_t loc,
6931 struct c_declarator *declarator, struct c_declspecs *declspecs,
6932 tree width, tree *decl_attrs)
6936 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
6937 && width == NULL_TREE)
6939 /* This is an unnamed decl.
6941 If we have something of the form "union { list } ;" then this
6942 is the anonymous union extension. Similarly for struct.
6944 If this is something of the form "struct foo;", then
6945 If MS or Plan 9 extensions are enabled, this is handled as
6946 an anonymous struct.
6947 Otherwise this is a forward declaration of a structure tag.
6949 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6950 If foo names a structure or union without a tag, then this
6951 is an anonymous struct (this is permitted by C11).
6952 If MS or Plan 9 extensions are enabled and foo names a
6953 structure, then again this is an anonymous struct.
6954 Otherwise this is an error.
6956 Oh what a horrid tangled web we weave. I wonder if MS consciously
6957 took this from Plan 9 or if it was an accident of implementation
6958 that took root before someone noticed the bug... */
6960 tree type = declspecs->type;
6961 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
6962 || TREE_CODE (type) == UNION_TYPE);
6966 && (flag_ms_extensions
6967 || flag_plan9_extensions
6968 || !declspecs->typedef_p))
6970 if (flag_ms_extensions || flag_plan9_extensions)
6972 else if (TYPE_NAME (type) == NULL)
6979 pedwarn (loc, 0, "declaration does not declare anything");
6985 pedwarn (loc, OPT_Wpedantic,
6986 "ISO C99 doesn%'t support unnamed structs/unions");
6988 pedwarn (loc, OPT_Wpedantic,
6989 "ISO C90 doesn%'t support unnamed structs/unions");
6993 value = grokdeclarator (declarator, declspecs, FIELD, false,
6994 width ? &width : NULL, decl_attrs, NULL, NULL,
6997 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
6998 DECL_INITIAL (value) = width;
7000 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
7002 /* If we currently have a binding for this field, set the
7003 in_struct field in the binding, so that we warn about lookups
7005 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
7008 /* If the in_struct field is not yet set, push it on a list
7009 to be cleared when this struct is finished. */
7012 struct_parse_info->fields.safe_push (b);
7021 /* Subroutine of detect_field_duplicates: return whether X and Y,
7022 which are both fields in the same struct, have duplicate field
7026 is_duplicate_field (tree x, tree y)
7028 if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y))
7031 /* When using -fplan9-extensions, an anonymous field whose name is a
7032 typedef can duplicate a field name. */
7033 if (flag_plan9_extensions
7034 && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE))
7036 tree xt, xn, yt, yn;
7039 if (DECL_NAME (x) != NULL_TREE)
7041 else if ((TREE_CODE (xt) == RECORD_TYPE || TREE_CODE (xt) == UNION_TYPE)
7042 && TYPE_NAME (xt) != NULL_TREE
7043 && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL)
7044 xn = DECL_NAME (TYPE_NAME (xt));
7049 if (DECL_NAME (y) != NULL_TREE)
7051 else if ((TREE_CODE (yt) == RECORD_TYPE || TREE_CODE (yt) == UNION_TYPE)
7052 && TYPE_NAME (yt) != NULL_TREE
7053 && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL)
7054 yn = DECL_NAME (TYPE_NAME (yt));
7058 if (xn != NULL_TREE && xn == yn)
7065 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7066 to HTAB, giving errors for any duplicates. */
7069 detect_field_duplicates_hash (tree fieldlist,
7070 hash_table <pointer_hash <tree_node> > htab)
7075 for (x = fieldlist; x ; x = DECL_CHAIN (x))
7076 if ((y = DECL_NAME (x)) != 0)
7078 slot = htab.find_slot (y, INSERT);
7081 error ("duplicate member %q+D", x);
7082 DECL_NAME (x) = NULL_TREE;
7086 else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7087 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7089 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab);
7091 /* When using -fplan9-extensions, an anonymous field whose
7092 name is a typedef can duplicate a field name. */
7093 if (flag_plan9_extensions
7094 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
7095 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)
7097 tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x)));
7098 slot = htab.find_slot (xn, INSERT);
7100 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x)));
7106 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7107 the list such that this does not present a problem later. */
7110 detect_field_duplicates (tree fieldlist)
7115 /* If the struct is the list of instance variables of an Objective-C
7116 class, then we need to check all the instance variables of
7117 superclasses when checking for duplicates (since you can't have
7118 an instance variable in a subclass with the same name as an
7119 instance variable in a superclass). We pass on this job to the
7120 Objective-C compiler. objc_detect_field_duplicates() will return
7121 false if we are not checking the list of instance variables and
7122 the C frontend should proceed with the standard field duplicate
7123 checks. If we are checking the list of instance variables, the
7124 ObjC frontend will do the check, emit the errors if needed, and
7125 then return true. */
7126 if (c_dialect_objc ())
7127 if (objc_detect_field_duplicates (false))
7130 /* First, see if there are more than "a few" fields.
7131 This is trivially true if there are zero or one fields. */
7132 if (!fieldlist || !DECL_CHAIN (fieldlist))
7137 if (DECL_NAME (x) == NULL_TREE
7138 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7139 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7142 } while (timeout > 0 && x);
7144 /* If there were "few" fields and no anonymous structures or unions,
7145 avoid the overhead of allocating a hash table. Instead just do
7146 the nested traversal thing. */
7149 for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x))
7150 /* When using -fplan9-extensions, we can have duplicates
7151 between typedef names and fields. */
7153 || (flag_plan9_extensions
7154 && DECL_NAME (x) == NULL_TREE
7155 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7156 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7157 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
7158 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL))
7160 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
7161 if (is_duplicate_field (y, x))
7163 error ("duplicate member %q+D", x);
7164 DECL_NAME (x) = NULL_TREE;
7170 hash_table <pointer_hash <tree_node> > htab;
7173 detect_field_duplicates_hash (fieldlist, htab);
7178 /* Finish up struct info used by -Wc++-compat. */
7181 warn_cxx_compat_finish_struct (tree fieldlist)
7185 struct c_binding *b;
7187 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7188 the current struct. We do this now at the end of the struct
7189 because the flag is used to issue visibility warnings, and we
7190 only want to issue those warnings if the type is referenced
7191 outside of the struct declaration. */
7192 FOR_EACH_VEC_ELT (struct_parse_info->struct_types, ix, x)
7193 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
7195 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7196 typedefs used when declaring fields in this struct. If the name
7197 of any of the fields is also a typedef name then the struct would
7198 not parse in C++, because the C++ lookup rules say that the
7199 typedef name would be looked up in the context of the struct, and
7200 would thus be the field rather than the typedef. */
7201 if (!struct_parse_info->typedefs_seen.is_empty ()
7202 && fieldlist != NULL_TREE)
7204 /* Use a pointer_set using the name of the typedef. We can use
7205 a pointer_set because identifiers are interned. */
7206 struct pointer_set_t *tset = pointer_set_create ();
7208 FOR_EACH_VEC_ELT (struct_parse_info->typedefs_seen, ix, x)
7209 pointer_set_insert (tset, DECL_NAME (x));
7211 for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x))
7213 if (DECL_NAME (x) != NULL_TREE
7214 && pointer_set_contains (tset, DECL_NAME (x)))
7216 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
7217 ("using %qD as both field and typedef name is "
7220 /* FIXME: It would be nice to report the location where
7221 the typedef name is used. */
7225 pointer_set_destroy (tset);
7228 /* For each field which has a binding and which was not defined in
7229 an enclosing struct, clear the in_struct field. */
7230 FOR_EACH_VEC_ELT (struct_parse_info->fields, ix, b)
7234 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7235 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7236 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7237 ATTRIBUTES are attributes to be applied to the structure.
7239 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7240 the struct was started. */
7243 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
7244 struct c_struct_parse_info *enclosing_struct_parse_info)
7247 bool toplevel = file_scope == current_scope;
7248 int saw_named_field;
7250 /* If this type was previously laid out as a forward reference,
7251 make sure we lay it out again. */
7255 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7259 for (x = fieldlist; x; x = DECL_CHAIN (x))
7261 if (DECL_NAME (x) != 0)
7264 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7265 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7271 if (TREE_CODE (t) == UNION_TYPE)
7274 pedwarn (loc, OPT_Wpedantic, "union has no named members");
7276 pedwarn (loc, OPT_Wpedantic, "union has no members");
7281 pedwarn (loc, OPT_Wpedantic, "struct has no named members");
7283 pedwarn (loc, OPT_Wpedantic, "struct has no members");
7288 /* Install struct as DECL_CONTEXT of each field decl.
7289 Also process specified field sizes, found in the DECL_INITIAL,
7290 storing 0 there after the type has been changed to precision equal
7291 to its width, rather than the precision of the specified standard
7292 type. (Correct layout requires the original type to have been preserved
7295 saw_named_field = 0;
7296 for (x = fieldlist; x; x = DECL_CHAIN (x))
7298 if (TREE_TYPE (x) == error_mark_node)
7301 DECL_CONTEXT (x) = t;
7303 /* If any field is const, the structure type is pseudo-const. */
7304 if (TREE_READONLY (x))
7305 C_TYPE_FIELDS_READONLY (t) = 1;
7308 /* A field that is pseudo-const makes the structure likewise. */
7309 tree t1 = strip_array_types (TREE_TYPE (x));
7310 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
7311 && C_TYPE_FIELDS_READONLY (t1))
7312 C_TYPE_FIELDS_READONLY (t) = 1;
7315 /* Any field that is volatile means variables of this type must be
7316 treated in some ways as volatile. */
7317 if (TREE_THIS_VOLATILE (x))
7318 C_TYPE_FIELDS_VOLATILE (t) = 1;
7320 /* Any field of nominal variable size implies structure is too. */
7321 if (C_DECL_VARIABLE_SIZE (x))
7322 C_TYPE_VARIABLE_SIZE (t) = 1;
7324 if (DECL_INITIAL (x))
7326 unsigned HOST_WIDE_INT width = tree_to_uhwi (DECL_INITIAL (x));
7327 DECL_SIZE (x) = bitsize_int (width);
7328 DECL_BIT_FIELD (x) = 1;
7329 SET_DECL_C_BIT_FIELD (x);
7333 && (DECL_BIT_FIELD (x)
7334 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
7335 DECL_PACKED (x) = 1;
7337 /* Detect flexible array member in an invalid context. */
7338 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
7339 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
7340 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
7341 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
7343 if (TREE_CODE (t) == UNION_TYPE)
7345 error_at (DECL_SOURCE_LOCATION (x),
7346 "flexible array member in union");
7347 TREE_TYPE (x) = error_mark_node;
7349 else if (DECL_CHAIN (x) != NULL_TREE)
7351 error_at (DECL_SOURCE_LOCATION (x),
7352 "flexible array member not at end of struct");
7353 TREE_TYPE (x) = error_mark_node;
7355 else if (!saw_named_field)
7357 error_at (DECL_SOURCE_LOCATION (x),
7358 "flexible array member in otherwise empty struct");
7359 TREE_TYPE (x) = error_mark_node;
7363 if (pedantic && TREE_CODE (t) == RECORD_TYPE
7364 && flexible_array_type_p (TREE_TYPE (x)))
7365 pedwarn (DECL_SOURCE_LOCATION (x), OPT_Wpedantic,
7366 "invalid use of structure with flexible array member");
7369 || TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7370 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7371 saw_named_field = 1;
7374 detect_field_duplicates (fieldlist);
7376 /* Now we have the nearly final fieldlist. Record it,
7377 then lay out the structure or union (including the fields). */
7379 TYPE_FIELDS (t) = fieldlist;
7383 if (TYPE_SIZE_UNIT (t)
7384 && TREE_CODE (TYPE_SIZE_UNIT (t)) == INTEGER_CST
7385 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t))
7386 && !valid_constant_size_p (TYPE_SIZE_UNIT (t)))
7387 error ("type %qT is too large", t);
7389 /* Give bit-fields their proper types. */
7391 tree *fieldlistp = &fieldlist;
7393 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
7394 && TREE_TYPE (*fieldlistp) != error_mark_node)
7396 unsigned HOST_WIDE_INT width
7397 = tree_to_uhwi (DECL_INITIAL (*fieldlistp));
7398 tree type = TREE_TYPE (*fieldlistp);
7399 if (width != TYPE_PRECISION (type))
7401 TREE_TYPE (*fieldlistp)
7402 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
7403 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
7405 DECL_INITIAL (*fieldlistp) = 0;
7408 fieldlistp = &DECL_CHAIN (*fieldlistp);
7411 /* Now we have the truly final field list.
7412 Store it in this type and in the variants. */
7414 TYPE_FIELDS (t) = fieldlist;
7416 /* If there are lots of fields, sort so we can look through them fast.
7417 We arbitrarily consider 16 or more elts to be "a lot". */
7422 for (x = fieldlist; x; x = DECL_CHAIN (x))
7424 if (len > 15 || DECL_NAME (x) == NULL)
7432 struct lang_type *space;
7433 struct sorted_fields_type *space2;
7435 len += list_length (x);
7437 /* Use the same allocation policy here that make_node uses, to
7438 ensure that this lives as long as the rest of the struct decl.
7439 All decls in an inline function need to be saved. */
7441 space = ggc_cleared_alloc<struct lang_type> ();
7442 space2 = (sorted_fields_type *) ggc_internal_alloc
7443 (sizeof (struct sorted_fields_type) + len * sizeof (tree));
7447 field_array = &space2->elts[0];
7448 for (x = fieldlist; x; x = DECL_CHAIN (x))
7450 field_array[len++] = x;
7452 /* If there is anonymous struct or union, break out of the loop. */
7453 if (DECL_NAME (x) == NULL)
7456 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7459 TYPE_LANG_SPECIFIC (t) = space;
7460 TYPE_LANG_SPECIFIC (t)->s->len = len;
7461 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
7462 qsort (field_array, len, sizeof (tree), field_decl_cmp);
7467 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
7469 TYPE_FIELDS (x) = TYPE_FIELDS (t);
7470 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
7471 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
7472 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
7473 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
7476 /* If this was supposed to be a transparent union, but we can't
7477 make it one, warn and turn off the flag. */
7478 if (TREE_CODE (t) == UNION_TYPE
7479 && TYPE_TRANSPARENT_AGGR (t)
7480 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
7482 TYPE_TRANSPARENT_AGGR (t) = 0;
7483 warning_at (loc, 0, "union cannot be made transparent");
7486 /* If this structure or union completes the type of any previous
7487 variable declaration, lay it out and output its rtl. */
7488 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
7492 tree decl = TREE_VALUE (x);
7493 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
7494 layout_array_type (TREE_TYPE (decl));
7495 if (TREE_CODE (decl) != TYPE_DECL)
7497 layout_decl (decl, 0);
7498 if (c_dialect_objc ())
7499 objc_check_decl (decl);
7500 rest_of_decl_compilation (decl, toplevel, 0);
7503 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
7505 /* Update type location to the one of the definition, instead of e.g.
7506 a forward declaration. */
7507 if (TYPE_STUB_DECL (t))
7508 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
7510 /* Finish debugging output for this type. */
7511 rest_of_type_compilation (t, toplevel);
7513 /* If we're inside a function proper, i.e. not file-scope and not still
7514 parsing parameters, then arrange for the size of a variable sized type
7516 if (building_stmt_list_p () && variably_modified_type_p (t, NULL_TREE))
7517 add_stmt (build_stmt (loc,
7518 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
7520 if (warn_cxx_compat)
7521 warn_cxx_compat_finish_struct (fieldlist);
7523 struct_parse_info->struct_types.release ();
7524 struct_parse_info->fields.release ();
7525 struct_parse_info->typedefs_seen.release ();
7526 XDELETE (struct_parse_info);
7528 struct_parse_info = enclosing_struct_parse_info;
7530 /* If this struct is defined inside a struct, add it to
7533 && struct_parse_info != NULL
7534 && !in_sizeof && !in_typeof && !in_alignof)
7535 struct_parse_info->struct_types.safe_push (t);
7540 /* Lay out the type T, and its element type, and so on. */
7543 layout_array_type (tree t)
7545 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
7546 layout_array_type (TREE_TYPE (t));
7550 /* Begin compiling the definition of an enumeration type.
7551 NAME is its name (or null if anonymous).
7552 LOC is the enum's location.
7553 Returns the type object, as yet incomplete.
7554 Also records info about it so that build_enumerator
7555 may be used to declare the individual values as they are read. */
7558 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
7560 tree enumtype = NULL_TREE;
7561 location_t enumloc = UNKNOWN_LOCATION;
7563 /* If this is the real definition for a previous forward reference,
7564 fill in the contents in the same object that used to be the
7565 forward reference. */
7567 if (name != NULL_TREE)
7568 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc);
7570 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
7572 enumtype = make_node (ENUMERAL_TYPE);
7573 pushtag (loc, name, enumtype);
7576 if (C_TYPE_BEING_DEFINED (enumtype))
7577 error_at (loc, "nested redefinition of %<enum %E%>", name);
7579 C_TYPE_BEING_DEFINED (enumtype) = 1;
7581 if (TYPE_VALUES (enumtype) != 0)
7583 /* This enum is a named one that has been declared already. */
7584 error_at (loc, "redeclaration of %<enum %E%>", name);
7585 if (enumloc != UNKNOWN_LOCATION)
7586 inform (enumloc, "originally defined here");
7588 /* Completely replace its old definition.
7589 The old enumerators remain defined, however. */
7590 TYPE_VALUES (enumtype) = 0;
7593 the_enum->enum_next_value = integer_zero_node;
7594 the_enum->enum_overflow = 0;
7596 if (flag_short_enums)
7597 TYPE_PACKED (enumtype) = 1;
7599 /* FIXME: This will issue a warning for a use of a type defined
7600 within sizeof in a statement expr. This is not terribly serious
7601 as C++ doesn't permit statement exprs within sizeof anyhow. */
7602 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7603 warning_at (loc, OPT_Wc___compat,
7604 "defining type in %qs expression is invalid in C++",
7607 : (in_typeof ? "typeof" : "alignof")));
7612 /* After processing and defining all the values of an enumeration type,
7613 install their decls in the enumeration type and finish it off.
7614 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7615 and ATTRIBUTES are the specified attributes.
7616 Returns ENUMTYPE. */
7619 finish_enum (tree enumtype, tree values, tree attributes)
7622 tree minnode = 0, maxnode = 0;
7625 bool toplevel = (file_scope == current_scope);
7626 struct lang_type *lt;
7628 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7630 /* Calculate the maximum value of any enumerator in this type. */
7632 if (values == error_mark_node)
7633 minnode = maxnode = integer_zero_node;
7636 minnode = maxnode = TREE_VALUE (values);
7637 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
7639 tree value = TREE_VALUE (pair);
7640 if (tree_int_cst_lt (maxnode, value))
7642 if (tree_int_cst_lt (value, minnode))
7647 /* Construct the final type of this enumeration. It is the same
7648 as one of the integral types - the narrowest one that fits, except
7649 that normally we only go as narrow as int - and signed iff any of
7650 the values are negative. */
7651 sign = (tree_int_cst_sgn (minnode) >= 0) ? UNSIGNED : SIGNED;
7652 precision = MAX (tree_int_cst_min_precision (minnode, sign),
7653 tree_int_cst_min_precision (maxnode, sign));
7655 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
7657 tem = c_common_type_for_size (precision, sign == UNSIGNED ? 1 : 0);
7660 warning (0, "enumeration values exceed range of largest integer");
7661 tem = long_long_integer_type_node;
7665 tem = sign == UNSIGNED ? unsigned_type_node : integer_type_node;
7667 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
7668 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
7669 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
7670 TYPE_SIZE (enumtype) = 0;
7672 /* If the precision of the type was specific with an attribute and it
7673 was too small, give an error. Otherwise, use it. */
7674 if (TYPE_PRECISION (enumtype))
7676 if (precision > TYPE_PRECISION (enumtype))
7677 error ("specified mode too small for enumeral values");
7680 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
7682 layout_type (enumtype);
7684 if (values != error_mark_node)
7686 /* Change the type of the enumerators to be the enum type. We
7687 need to do this irrespective of the size of the enum, for
7688 proper type checking. Replace the DECL_INITIALs of the
7689 enumerators, and the value slots of the list, with copies
7690 that have the enum type; they cannot be modified in place
7691 because they may be shared (e.g. integer_zero_node) Finally,
7692 change the purpose slots to point to the names of the decls. */
7693 for (pair = values; pair; pair = TREE_CHAIN (pair))
7695 tree enu = TREE_PURPOSE (pair);
7696 tree ini = DECL_INITIAL (enu);
7698 TREE_TYPE (enu) = enumtype;
7700 /* The ISO C Standard mandates enumerators to have type int,
7701 even though the underlying type of an enum type is
7702 unspecified. However, GCC allows enumerators of any
7703 integer type as an extensions. build_enumerator()
7704 converts any enumerators that fit in an int to type int,
7705 to avoid promotions to unsigned types when comparing
7706 integers with enumerators that fit in the int range.
7707 When -pedantic is given, build_enumerator() would have
7708 already warned about those that don't fit. Here we
7709 convert the rest to the enumerator type. */
7710 if (TREE_TYPE (ini) != integer_type_node)
7711 ini = convert (enumtype, ini);
7713 DECL_INITIAL (enu) = ini;
7714 TREE_PURPOSE (pair) = DECL_NAME (enu);
7715 TREE_VALUE (pair) = ini;
7718 TYPE_VALUES (enumtype) = values;
7721 /* Record the min/max values so that we can warn about bit-field
7722 enumerations that are too small for the values. */
7723 lt = ggc_cleared_alloc<struct lang_type> ();
7724 lt->enum_min = minnode;
7725 lt->enum_max = maxnode;
7726 TYPE_LANG_SPECIFIC (enumtype) = lt;
7728 /* Fix up all variant types of this enum type. */
7729 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
7731 if (tem == enumtype)
7733 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
7734 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
7735 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
7736 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
7737 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
7738 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
7739 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
7740 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
7741 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
7742 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
7743 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
7746 /* Finish debugging output for this type. */
7747 rest_of_type_compilation (enumtype, toplevel);
7749 /* If this enum is defined inside a struct, add it to
7752 && struct_parse_info != NULL
7753 && !in_sizeof && !in_typeof && !in_alignof)
7754 struct_parse_info->struct_types.safe_push (enumtype);
7759 /* Build and install a CONST_DECL for one value of the
7760 current enumeration type (one that was begun with start_enum).
7761 DECL_LOC is the location of the enumerator.
7762 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7763 Return a tree-list containing the CONST_DECL and its value.
7764 Assignment of sequential values by default is handled here. */
7767 build_enumerator (location_t decl_loc, location_t loc,
7768 struct c_enum_contents *the_enum, tree name, tree value)
7772 /* Validate and default VALUE. */
7776 /* Don't issue more errors for error_mark_node (i.e. an
7777 undeclared identifier) - just ignore the value expression. */
7778 if (value == error_mark_node)
7780 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
7782 error_at (loc, "enumerator value for %qE is not an integer constant",
7788 if (TREE_CODE (value) != INTEGER_CST)
7790 value = c_fully_fold (value, false, NULL);
7791 if (TREE_CODE (value) == INTEGER_CST)
7792 pedwarn (loc, OPT_Wpedantic,
7793 "enumerator value for %qE is not an integer "
7794 "constant expression", name);
7796 if (TREE_CODE (value) != INTEGER_CST)
7798 error ("enumerator value for %qE is not an integer constant",
7804 value = default_conversion (value);
7805 constant_expression_warning (value);
7810 /* Default based on previous value. */
7811 /* It should no longer be possible to have NON_LVALUE_EXPR
7815 value = the_enum->enum_next_value;
7816 if (the_enum->enum_overflow)
7817 error_at (loc, "overflow in enumeration values");
7819 /* Even though the underlying type of an enum is unspecified, the
7820 type of enumeration constants is explicitly defined as int
7821 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7823 else if (!int_fits_type_p (value, integer_type_node))
7824 pedwarn (loc, OPT_Wpedantic,
7825 "ISO C restricts enumerator values to range of %<int%>");
7827 /* The ISO C Standard mandates enumerators to have type int, even
7828 though the underlying type of an enum type is unspecified.
7829 However, GCC allows enumerators of any integer type as an
7830 extensions. Here we convert any enumerators that fit in an int
7831 to type int, to avoid promotions to unsigned types when comparing
7832 integers with enumerators that fit in the int range. When
7833 -pedantic is given, we would have already warned about those that
7834 don't fit. We have to do this here rather than in finish_enum
7835 because this value may be used to define more enumerators. */
7836 if (int_fits_type_p (value, integer_type_node))
7837 value = convert (integer_type_node, value);
7839 /* Set basis for default for next value. */
7840 the_enum->enum_next_value
7841 = build_binary_op (EXPR_LOC_OR_LOC (value, input_location),
7842 PLUS_EXPR, value, integer_one_node, 0);
7843 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
7845 /* Now create a declaration for the enum value name. */
7847 type = TREE_TYPE (value);
7848 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
7849 TYPE_PRECISION (integer_type_node)),
7850 (TYPE_PRECISION (type)
7851 >= TYPE_PRECISION (integer_type_node)
7852 && TYPE_UNSIGNED (type)));
7854 decl = build_decl (decl_loc, CONST_DECL, name, type);
7855 DECL_INITIAL (decl) = convert (type, value);
7858 return tree_cons (decl, value, NULL_TREE);
7862 /* Create the FUNCTION_DECL for a function definition.
7863 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7864 the declaration; they describe the function's name and the type it returns,
7865 but twisted together in a fashion that parallels the syntax of C.
7867 This function creates a binding context for the function body
7868 as well as setting up the FUNCTION_DECL in current_function_decl.
7870 Returns 1 on success. If the DECLARATOR is not suitable for a function
7871 (it defines a datum instead), we return 0, which tells
7872 yyparse to report a parse error. */
7875 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
7878 tree decl1, old_decl;
7879 tree restype, resdecl;
7882 current_function_returns_value = 0; /* Assume, until we see it does. */
7883 current_function_returns_null = 0;
7884 current_function_returns_abnormally = 0;
7885 warn_about_return_type = 0;
7886 c_switch_stack = NULL;
7888 /* Indicate no valid break/continue context by setting these variables
7889 to some non-null, non-label value. We'll notice and emit the proper
7890 error message in c_finish_bc_stmt. */
7891 c_break_label = c_cont_label = size_zero_node;
7893 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
7894 &attributes, NULL, NULL, DEPRECATED_NORMAL);
7896 /* If the declarator is not suitable for a function definition,
7897 cause a syntax error. */
7899 || TREE_CODE (decl1) != FUNCTION_DECL)
7902 loc = DECL_SOURCE_LOCATION (decl1);
7904 c_decl_attributes (&decl1, attributes, 0);
7906 if (DECL_DECLARED_INLINE_P (decl1)
7907 && DECL_UNINLINABLE (decl1)
7908 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
7909 warning_at (loc, OPT_Wattributes,
7910 "inline function %qD given attribute noinline",
7913 /* Handle gnu_inline attribute. */
7914 if (declspecs->inline_p
7915 && !flag_gnu89_inline
7916 && TREE_CODE (decl1) == FUNCTION_DECL
7917 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
7918 || current_function_decl))
7920 if (declspecs->storage_class != csc_static)
7921 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
7924 announce_function (decl1);
7926 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
7928 error_at (loc, "return type is an incomplete type");
7929 /* Make it return void instead. */
7931 = build_function_type (void_type_node,
7932 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
7935 if (warn_about_return_type)
7936 pedwarn_c99 (loc, flag_isoc99 ? 0
7937 : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
7938 "return type defaults to %<int%>");
7940 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7941 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7942 DECL_INITIAL (decl1) = error_mark_node;
7944 /* A nested function is not global. */
7945 if (current_function_decl != 0)
7946 TREE_PUBLIC (decl1) = 0;
7948 /* If this definition isn't a prototype and we had a prototype declaration
7949 before, copy the arg type info from that prototype. */
7950 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
7951 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
7953 current_function_prototype_locus = UNKNOWN_LOCATION;
7954 current_function_prototype_built_in = false;
7955 current_function_prototype_arg_types = NULL_TREE;
7956 if (!prototype_p (TREE_TYPE (decl1)))
7958 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
7959 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7960 TREE_TYPE (TREE_TYPE (old_decl))))
7962 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
7964 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
7965 current_function_prototype_built_in
7966 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
7967 current_function_prototype_arg_types
7968 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
7970 if (TREE_PUBLIC (decl1))
7972 /* If there is an external prototype declaration of this
7973 function, record its location but do not copy information
7974 to this decl. This may be an invisible declaration
7975 (built-in or in a scope which has finished) or simply
7976 have more refined argument types than any declaration
7978 struct c_binding *b;
7979 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
7980 if (B_IN_SCOPE (b, external_scope))
7984 tree ext_decl, ext_type;
7986 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
7987 if (TREE_CODE (ext_type) == FUNCTION_TYPE
7988 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7989 TREE_TYPE (ext_type)))
7991 current_function_prototype_locus
7992 = DECL_SOURCE_LOCATION (ext_decl);
7993 current_function_prototype_built_in
7994 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
7995 current_function_prototype_arg_types
7996 = TYPE_ARG_TYPES (ext_type);
8002 /* Optionally warn of old-fashioned def with no previous prototype. */
8003 if (warn_strict_prototypes
8004 && old_decl != error_mark_node
8005 && !prototype_p (TREE_TYPE (decl1))
8006 && C_DECL_ISNT_PROTOTYPE (old_decl))
8007 warning_at (loc, OPT_Wstrict_prototypes,
8008 "function declaration isn%'t a prototype");
8009 /* Optionally warn of any global def with no previous prototype. */
8010 else if (warn_missing_prototypes
8011 && old_decl != error_mark_node
8012 && TREE_PUBLIC (decl1)
8013 && !MAIN_NAME_P (DECL_NAME (decl1))
8014 && C_DECL_ISNT_PROTOTYPE (old_decl)
8015 && !DECL_DECLARED_INLINE_P (decl1))
8016 warning_at (loc, OPT_Wmissing_prototypes,
8017 "no previous prototype for %qD", decl1);
8018 /* Optionally warn of any def with no previous prototype
8019 if the function has already been used. */
8020 else if (warn_missing_prototypes
8022 && old_decl != error_mark_node
8023 && TREE_USED (old_decl)
8024 && !prototype_p (TREE_TYPE (old_decl)))
8025 warning_at (loc, OPT_Wmissing_prototypes,
8026 "%qD was used with no prototype before its definition", decl1);
8027 /* Optionally warn of any global def with no previous declaration. */
8028 else if (warn_missing_declarations
8029 && TREE_PUBLIC (decl1)
8031 && !MAIN_NAME_P (DECL_NAME (decl1)))
8032 warning_at (loc, OPT_Wmissing_declarations,
8033 "no previous declaration for %qD",
8035 /* Optionally warn of any def with no previous declaration
8036 if the function has already been used. */
8037 else if (warn_missing_declarations
8039 && old_decl != error_mark_node
8040 && TREE_USED (old_decl)
8041 && C_DECL_IMPLICIT (old_decl))
8042 warning_at (loc, OPT_Wmissing_declarations,
8043 "%qD was used with no declaration before its definition", decl1);
8045 /* This function exists in static storage.
8046 (This does not mean `static' in the C sense!) */
8047 TREE_STATIC (decl1) = 1;
8049 /* This is the earliest point at which we might know the assembler
8050 name of the function. Thus, if it's set before this, die horribly. */
8051 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
8053 /* If #pragma weak was used, mark the decl weak now. */
8054 if (current_scope == file_scope)
8055 maybe_apply_pragma_weak (decl1);
8057 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8058 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
8060 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
8061 != integer_type_node)
8062 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
8063 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1))))
8064 pedwarn (loc, OPT_Wmain, "%<_Atomic%>-qualified return type of %qD",
8067 check_main_parameter_types (decl1);
8069 if (!TREE_PUBLIC (decl1))
8070 pedwarn (loc, OPT_Wmain,
8071 "%qD is normally a non-static function", decl1);
8074 /* Record the decl so that the function name is defined.
8075 If we already have a decl for this name, and it is a FUNCTION_DECL,
8076 use the old decl. */
8078 current_function_decl = pushdecl (decl1);
8081 declare_parm_level ();
8083 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
8084 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
8085 DECL_ARTIFICIAL (resdecl) = 1;
8086 DECL_IGNORED_P (resdecl) = 1;
8087 DECL_RESULT (current_function_decl) = resdecl;
8089 start_fname_decls ();
8094 /* Subroutine of store_parm_decls which handles new-style function
8095 definitions (prototype format). The parms already have decls, so we
8096 need only record them as in effect and complain if any redundant
8097 old-style parm decls were written. */
8099 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
8105 if (current_scope->bindings)
8107 error_at (DECL_SOURCE_LOCATION (fndecl),
8108 "old-style parameter declarations in prototyped "
8109 "function definition");
8111 /* Get rid of the old-style declarations. */
8115 /* Don't issue this warning for nested functions, and don't issue this
8116 warning if we got here because ARG_INFO_TYPES was error_mark_node
8117 (this happens when a function definition has just an ellipsis in
8118 its parameter list). */
8119 else if (!in_system_header_at (input_location)
8120 && !current_function_scope
8121 && arg_info->types != error_mark_node)
8122 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
8123 "traditional C rejects ISO C style function definitions");
8125 /* Now make all the parameter declarations visible in the function body.
8126 We can bypass most of the grunt work of pushdecl. */
8127 for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl))
8129 DECL_CONTEXT (decl) = current_function_decl;
8130 if (DECL_NAME (decl))
8132 bind (DECL_NAME (decl), decl, current_scope,
8133 /*invisible=*/false, /*nested=*/false,
8135 if (!TREE_USED (decl))
8136 warn_if_shadowing (decl);
8139 error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted");
8142 /* Record the parameter list in the function declaration. */
8143 DECL_ARGUMENTS (fndecl) = arg_info->parms;
8145 /* Now make all the ancillary declarations visible, likewise. */
8146 for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl))
8148 DECL_CONTEXT (decl) = current_function_decl;
8149 if (DECL_NAME (decl))
8150 bind (DECL_NAME (decl), decl, current_scope,
8151 /*invisible=*/false,
8152 /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL),
8156 /* And all the tag declarations. */
8157 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
8159 bind (tag->id, tag->type, current_scope,
8160 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
8163 /* Subroutine of store_parm_decls which handles old-style function
8164 definitions (separate parameter list and declarations). */
8167 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
8169 struct c_binding *b;
8170 tree parm, decl, last;
8171 tree parmids = arg_info->parms;
8172 struct pointer_set_t *seen_args = pointer_set_create ();
8174 if (!in_system_header_at (input_location))
8175 warning_at (DECL_SOURCE_LOCATION (fndecl),
8176 OPT_Wold_style_definition, "old-style function definition");
8178 /* Match each formal parameter name with its declaration. Save each
8179 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8180 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8182 if (TREE_VALUE (parm) == 0)
8184 error_at (DECL_SOURCE_LOCATION (fndecl),
8185 "parameter name missing from parameter list");
8186 TREE_PURPOSE (parm) = 0;
8190 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
8191 if (b && B_IN_CURRENT_SCOPE (b))
8194 /* Skip erroneous parameters. */
8195 if (decl == error_mark_node)
8197 /* If we got something other than a PARM_DECL it is an error. */
8198 if (TREE_CODE (decl) != PARM_DECL)
8199 error_at (DECL_SOURCE_LOCATION (decl),
8200 "%qD declared as a non-parameter", decl);
8201 /* If the declaration is already marked, we have a duplicate
8202 name. Complain and ignore the duplicate. */
8203 else if (pointer_set_contains (seen_args, decl))
8205 error_at (DECL_SOURCE_LOCATION (decl),
8206 "multiple parameters named %qD", decl);
8207 TREE_PURPOSE (parm) = 0;
8210 /* If the declaration says "void", complain and turn it into
8212 else if (VOID_TYPE_P (TREE_TYPE (decl)))
8214 error_at (DECL_SOURCE_LOCATION (decl),
8215 "parameter %qD declared with void type", decl);
8216 TREE_TYPE (decl) = integer_type_node;
8217 DECL_ARG_TYPE (decl) = integer_type_node;
8218 layout_decl (decl, 0);
8220 warn_if_shadowing (decl);
8222 /* If no declaration found, default to int. */
8225 /* FIXME diagnostics: This should be the location of the argument,
8226 not the FNDECL. E.g., for an old-style declaration
8228 int f10(v) { blah; }
8230 We should use the location of the V, not the F10.
8231 Unfortunately, the V is an IDENTIFIER_NODE which has no
8232 location. In the future we need locations for c_arg_info
8235 See gcc.dg/Wshadow-3.c for an example of this problem. */
8236 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
8237 PARM_DECL, TREE_VALUE (parm), integer_type_node);
8238 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
8240 warn_if_shadowing (decl);
8243 pedwarn (DECL_SOURCE_LOCATION (decl),
8244 0, "type of %qD defaults to %<int%>", decl);
8246 warning_at (DECL_SOURCE_LOCATION (decl),
8247 OPT_Wmissing_parameter_type,
8248 "type of %qD defaults to %<int%>", decl);
8251 TREE_PURPOSE (parm) = decl;
8252 pointer_set_insert (seen_args, decl);
8255 /* Now examine the parms chain for incomplete declarations
8256 and declarations with no corresponding names. */
8258 for (b = current_scope->bindings; b; b = b->prev)
8261 if (TREE_CODE (parm) != PARM_DECL)
8264 if (TREE_TYPE (parm) != error_mark_node
8265 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
8267 error_at (DECL_SOURCE_LOCATION (parm),
8268 "parameter %qD has incomplete type", parm);
8269 TREE_TYPE (parm) = error_mark_node;
8272 if (!pointer_set_contains (seen_args, parm))
8274 error_at (DECL_SOURCE_LOCATION (parm),
8275 "declaration for parameter %qD but no such parameter",
8278 /* Pretend the parameter was not missing.
8279 This gets us to a standard state and minimizes
8280 further error messages. */
8281 parmids = chainon (parmids, tree_cons (parm, 0, 0));
8285 /* Chain the declarations together in the order of the list of
8286 names. Store that chain in the function decl, replacing the
8287 list of names. Update the current scope to match. */
8288 DECL_ARGUMENTS (fndecl) = 0;
8290 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8291 if (TREE_PURPOSE (parm))
8293 if (parm && TREE_PURPOSE (parm))
8295 last = TREE_PURPOSE (parm);
8296 DECL_ARGUMENTS (fndecl) = last;
8298 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
8299 if (TREE_PURPOSE (parm))
8301 DECL_CHAIN (last) = TREE_PURPOSE (parm);
8302 last = TREE_PURPOSE (parm);
8304 DECL_CHAIN (last) = 0;
8307 pointer_set_destroy (seen_args);
8309 /* If there was a previous prototype,
8310 set the DECL_ARG_TYPE of each argument according to
8311 the type previously specified, and report any mismatches. */
8313 if (current_function_prototype_arg_types)
8316 for (parm = DECL_ARGUMENTS (fndecl),
8317 type = current_function_prototype_arg_types;
8318 parm || (type && TREE_VALUE (type) != error_mark_node
8319 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
8320 parm = DECL_CHAIN (parm), type = TREE_CHAIN (type))
8322 if (parm == 0 || type == 0
8323 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
8325 if (current_function_prototype_built_in)
8326 warning_at (DECL_SOURCE_LOCATION (fndecl),
8327 0, "number of arguments doesn%'t match "
8328 "built-in prototype");
8331 /* FIXME diagnostics: This should be the location of
8332 FNDECL, but there is bug when a prototype is
8333 declared inside function context, but defined
8334 outside of it (e.g., gcc.dg/pr15698-2.c). In
8335 which case FNDECL gets the location of the
8336 prototype, not the definition. */
8337 error_at (input_location,
8338 "number of arguments doesn%'t match prototype");
8340 error_at (current_function_prototype_locus,
8341 "prototype declaration");
8345 /* Type for passing arg must be consistent with that
8346 declared for the arg. ISO C says we take the unqualified
8347 type for parameters declared with qualified type. */
8348 if (TREE_TYPE (parm) != error_mark_node
8349 && TREE_TYPE (type) != error_mark_node
8350 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
8351 != TYPE_ATOMIC (TREE_VALUE (type)))
8352 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
8353 TYPE_MAIN_VARIANT (TREE_VALUE (type)))))
8355 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
8356 == TYPE_ATOMIC (TREE_VALUE (type)))
8357 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
8358 == TYPE_MAIN_VARIANT (TREE_VALUE (type))))
8360 /* Adjust argument to match prototype. E.g. a previous
8361 `int foo(float);' prototype causes
8362 `int foo(x) float x; {...}' to be treated like
8363 `int foo(float x) {...}'. This is particularly
8364 useful for argument types like uid_t. */
8365 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
8367 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
8368 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
8369 && TYPE_PRECISION (TREE_TYPE (parm))
8370 < TYPE_PRECISION (integer_type_node))
8371 DECL_ARG_TYPE (parm)
8372 = c_type_promotes_to (TREE_TYPE (parm));
8374 /* ??? Is it possible to get here with a
8375 built-in prototype or will it always have
8376 been diagnosed as conflicting with an
8377 old-style definition and discarded? */
8378 if (current_function_prototype_built_in)
8379 warning_at (DECL_SOURCE_LOCATION (parm),
8380 OPT_Wpedantic, "promoted argument %qD "
8381 "doesn%'t match built-in prototype", parm);
8384 pedwarn (DECL_SOURCE_LOCATION (parm),
8385 OPT_Wpedantic, "promoted argument %qD "
8386 "doesn%'t match prototype", parm);
8387 pedwarn (current_function_prototype_locus, OPT_Wpedantic,
8388 "prototype declaration");
8393 if (current_function_prototype_built_in)
8394 warning_at (DECL_SOURCE_LOCATION (parm),
8395 0, "argument %qD doesn%'t match "
8396 "built-in prototype", parm);
8399 error_at (DECL_SOURCE_LOCATION (parm),
8400 "argument %qD doesn%'t match prototype", parm);
8401 error_at (current_function_prototype_locus,
8402 "prototype declaration");
8407 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
8410 /* Otherwise, create a prototype that would match. */
8414 tree actual = 0, last = 0, type;
8416 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm))
8418 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
8420 TREE_CHAIN (last) = type;
8425 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
8427 TREE_CHAIN (last) = type;
8431 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8432 of the type of this function, but we need to avoid having this
8433 affect the types of other similarly-typed functions, so we must
8434 first force the generation of an identical (but separate) type
8435 node for the relevant function type. The new node we create
8436 will be a variant of the main variant of the original function
8439 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
8441 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
8445 /* Store parameter declarations passed in ARG_INFO into the current
8446 function declaration. */
8449 store_parm_decls_from (struct c_arg_info *arg_info)
8451 current_function_arg_info = arg_info;
8452 store_parm_decls ();
8455 /* Store the parameter declarations into the current function declaration.
8456 This is called after parsing the parameter declarations, before
8457 digesting the body of the function.
8459 For an old-style definition, construct a prototype out of the old-style
8460 parameter declarations and inject it into the function's type. */
8463 store_parm_decls (void)
8465 tree fndecl = current_function_decl;
8468 /* The argument information block for FNDECL. */
8469 struct c_arg_info *arg_info = current_function_arg_info;
8470 current_function_arg_info = 0;
8472 /* True if this definition is written with a prototype. Note:
8473 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8474 list in a function definition as equivalent to (void) -- an
8475 empty argument list specifies the function has no parameters,
8476 but only (void) sets up a prototype for future calls. */
8477 proto = arg_info->types != 0;
8480 store_parm_decls_newstyle (fndecl, arg_info);
8482 store_parm_decls_oldstyle (fndecl, arg_info);
8484 /* The next call to push_scope will be a function body. */
8486 next_is_function_body = true;
8488 /* Write a record describing this function definition to the prototypes
8489 file (if requested). */
8491 gen_aux_info_record (fndecl, 1, 0, proto);
8493 /* Initialize the RTL code for the function. */
8494 allocate_struct_function (fndecl, false);
8496 if (warn_unused_local_typedefs)
8497 cfun->language = ggc_cleared_alloc<language_function> ();
8499 /* Begin the statement tree for this function. */
8500 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
8502 /* ??? Insert the contents of the pending sizes list into the function
8503 to be evaluated. The only reason left to have this is
8504 void foo(int n, int array[n++])
8505 because we throw away the array type in favor of a pointer type, and
8506 thus won't naturally see the SAVE_EXPR containing the increment. All
8507 other pending sizes would be handled by gimplify_parameters. */
8508 if (arg_info->pending_sizes)
8509 add_stmt (arg_info->pending_sizes);
8512 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8513 c_finish_omp_declare_simd for function prototypes. No diagnostics
8517 temp_store_parm_decls (tree fndecl, tree parms)
8520 for (tree p = parms; p; p = DECL_CHAIN (p))
8522 DECL_CONTEXT (p) = fndecl;
8524 bind (DECL_NAME (p), p, current_scope,
8525 /*invisible=*/false, /*nested=*/false,
8530 /* Undo what temp_store_parm_decls did. */
8533 temp_pop_parm_decls (void)
8535 /* Clear all bindings in this temporary scope, so that
8536 pop_scope doesn't create a BLOCK. */
8537 struct c_binding *b = current_scope->bindings;
8538 current_scope->bindings = NULL;
8539 for (; b; b = free_binding_and_advance (b))
8541 gcc_assert (TREE_CODE (b->decl) == PARM_DECL);
8542 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
8543 I_SYMBOL_BINDING (b->id) = b->shadowed;
8544 if (b->shadowed && b->shadowed->u.type)
8545 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
8551 /* Finish up a function declaration and compile that function
8552 all the way to assembler language output. Then free the storage
8553 for the function definition.
8555 This is called after parsing the body of the function definition. */
8558 finish_function (void)
8560 tree fndecl = current_function_decl;
8562 if (c_dialect_objc ())
8563 objc_finish_function ();
8565 if (TREE_CODE (fndecl) == FUNCTION_DECL
8566 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
8568 tree args = DECL_ARGUMENTS (fndecl);
8569 for (; args; args = DECL_CHAIN (args))
8571 tree type = TREE_TYPE (args);
8572 if (INTEGRAL_TYPE_P (type)
8573 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
8574 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
8578 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
8579 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
8581 /* Must mark the RESULT_DECL as being in this function. */
8583 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
8584 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
8586 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
8587 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
8588 == integer_type_node && flag_isoc99)
8590 /* Hack. We don't want the middle-end to warn that this return
8591 is unreachable, so we mark its location as special. Using
8592 UNKNOWN_LOCATION has the problem that it gets clobbered in
8593 annotate_one_with_locus. A cleaner solution might be to
8594 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8596 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
8599 /* Tie off the statement tree for this function. */
8600 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
8602 /* If the function has _Cilk_spawn in front of a function call inside it
8603 i.e. it is a spawning function, then add the appropriate Cilk plus
8604 functions inside. */
8605 if (fn_contains_cilk_spawn_p (cfun))
8606 cfun->cilk_frame_decl = insert_cilk_frame (fndecl);
8608 finish_fname_decls ();
8610 /* Complain if there's just no return statement. */
8611 if (warn_return_type
8612 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
8613 && !current_function_returns_value && !current_function_returns_null
8614 /* Don't complain if we are no-return. */
8615 && !current_function_returns_abnormally
8616 /* Don't complain if we are declared noreturn. */
8617 && !TREE_THIS_VOLATILE (fndecl)
8618 /* Don't warn for main(). */
8619 && !MAIN_NAME_P (DECL_NAME (fndecl))
8620 /* Or if they didn't actually specify a return type. */
8621 && !C_FUNCTION_IMPLICIT_INT (fndecl)
8622 /* Normally, with -Wreturn-type, flow will complain, but we might
8623 optimize out static functions. */
8624 && !TREE_PUBLIC (fndecl))
8626 warning (OPT_Wreturn_type,
8627 "no return statement in function returning non-void");
8628 TREE_NO_WARNING (fndecl) = 1;
8631 /* Complain about parameters that are only set, but never otherwise used. */
8632 if (warn_unused_but_set_parameter)
8636 for (decl = DECL_ARGUMENTS (fndecl);
8638 decl = DECL_CHAIN (decl))
8639 if (TREE_USED (decl)
8640 && TREE_CODE (decl) == PARM_DECL
8641 && !DECL_READ_P (decl)
8643 && !DECL_ARTIFICIAL (decl)
8644 && !TREE_NO_WARNING (decl))
8645 warning_at (DECL_SOURCE_LOCATION (decl),
8646 OPT_Wunused_but_set_parameter,
8647 "parameter %qD set but not used", decl);
8650 /* Complain about locally defined typedefs that are not used in this
8652 maybe_warn_unused_local_typedefs ();
8654 /* Store the end of the function, so that we get good line number
8655 info for the epilogue. */
8656 cfun->function_end_locus = input_location;
8658 /* Finalize the ELF visibility for the function. */
8659 c_determine_visibility (fndecl);
8661 /* For GNU C extern inline functions disregard inline limits. */
8662 if (DECL_EXTERNAL (fndecl)
8663 && DECL_DECLARED_INLINE_P (fndecl))
8664 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
8666 /* Genericize before inlining. Delay genericizing nested functions
8667 until their parent function is genericized. Since finalizing
8668 requires GENERIC, delay that as well. */
8670 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
8671 && !undef_nested_function)
8673 if (!decl_function_context (fndecl))
8675 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
8676 c_genericize (fndecl);
8678 /* ??? Objc emits functions after finalizing the compilation unit.
8679 This should be cleaned up later and this conditional removed. */
8680 if (cgraph_global_info_ready)
8682 cgraph_add_new_function (fndecl, false);
8685 cgraph_finalize_function (fndecl, false);
8689 /* Register this function with cgraph just far enough to get it
8690 added to our parent's nested function list. Handy, since the
8691 C front end doesn't have such a list. */
8692 (void) cgraph_get_create_node (fndecl);
8696 if (!decl_function_context (fndecl))
8697 undef_nested_function = false;
8699 if (cfun->language != NULL)
8701 ggc_free (cfun->language);
8702 cfun->language = NULL;
8705 /* We're leaving the context of this function, so zap cfun.
8706 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8707 tree_rest_of_compilation. */
8709 current_function_decl = NULL;
8712 /* Check the declarations given in a for-loop for satisfying the C99
8713 constraints. If exactly one such decl is found, return it. LOC is
8714 the location of the opening parenthesis of the for loop. The last
8715 parameter allows you to control the "for loop initial declarations
8716 are only allowed in C99 mode". Normally, you should pass
8717 flag_isoc99 as that parameter. But in some cases (Objective-C
8718 foreach loop, for example) we want to run the checks in this
8719 function even if not in C99 mode, so we allow the caller to turn
8720 off the error about not being in C99 mode.
8724 check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error)
8726 struct c_binding *b;
8727 tree one_decl = NULL_TREE;
8730 if (!turn_off_iso_c99_error)
8732 static bool hint = true;
8733 /* If we get here, declarations have been used in a for loop without
8734 the C99 for loop scope. This doesn't make much sense, so don't
8736 error_at (loc, "%<for%> loop initial declarations "
8737 "are only allowed in C99 or C11 mode");
8741 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
8742 "to compile your code");
8747 /* C99 subclause 6.8.5 paragraph 3:
8749 [#3] The declaration part of a for statement shall only
8750 declare identifiers for objects having storage class auto or
8753 It isn't clear whether, in this sentence, "identifiers" binds to
8754 "shall only declare" or to "objects" - that is, whether all identifiers
8755 declared must be identifiers for objects, or whether the restriction
8756 only applies to those that are. (A question on this in comp.std.c
8757 in November 2000 received no answer.) We implement the strictest
8758 interpretation, to avoid creating an extension which later causes
8761 for (b = current_scope->bindings; b; b = b->prev)
8764 tree decl = b->decl;
8769 switch (TREE_CODE (decl))
8773 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
8774 if (TREE_STATIC (decl))
8776 "declaration of static variable %qD in %<for%> loop "
8777 "initial declaration", decl);
8778 else if (DECL_EXTERNAL (decl))
8780 "declaration of %<extern%> variable %qD in %<for%> loop "
8781 "initial declaration", decl);
8787 "%<struct %E%> declared in %<for%> loop initial "
8792 "%<union %E%> declared in %<for%> loop initial declaration",
8796 error_at (loc, "%<enum %E%> declared in %<for%> loop "
8797 "initial declaration", id);
8800 error_at (loc, "declaration of non-variable "
8801 "%qD in %<for%> loop initial declaration", decl);
8808 return n_decls == 1 ? one_decl : NULL_TREE;
8811 /* Save and reinitialize the variables
8812 used during compilation of a C function. */
8815 c_push_function_context (void)
8817 struct language_function *p = cfun->language;
8818 /* cfun->language might have been already allocated by the use of
8819 -Wunused-local-typedefs. In that case, just re-use it. */
8821 cfun->language = p = ggc_cleared_alloc<language_function> ();
8823 p->base.x_stmt_tree = c_stmt_tree;
8824 c_stmt_tree.x_cur_stmt_list = vec_safe_copy (c_stmt_tree.x_cur_stmt_list);
8825 p->x_break_label = c_break_label;
8826 p->x_cont_label = c_cont_label;
8827 p->x_switch_stack = c_switch_stack;
8828 p->arg_info = current_function_arg_info;
8829 p->returns_value = current_function_returns_value;
8830 p->returns_null = current_function_returns_null;
8831 p->returns_abnormally = current_function_returns_abnormally;
8832 p->warn_about_return_type = warn_about_return_type;
8834 push_function_context ();
8837 /* Restore the variables used during compilation of a C function. */
8840 c_pop_function_context (void)
8842 struct language_function *p;
8844 pop_function_context ();
8847 /* When -Wunused-local-typedefs is in effect, cfun->languages is
8848 used to store data throughout the life time of the current cfun,
8849 So don't deallocate it. */
8850 if (!warn_unused_local_typedefs)
8851 cfun->language = NULL;
8853 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
8854 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
8856 /* Stop pointing to the local nodes about to be freed. */
8857 /* But DECL_INITIAL must remain nonzero so we know this
8858 was an actual function definition. */
8859 DECL_INITIAL (current_function_decl) = error_mark_node;
8860 DECL_ARGUMENTS (current_function_decl) = 0;
8863 c_stmt_tree = p->base.x_stmt_tree;
8864 p->base.x_stmt_tree.x_cur_stmt_list = NULL;
8865 c_break_label = p->x_break_label;
8866 c_cont_label = p->x_cont_label;
8867 c_switch_stack = p->x_switch_stack;
8868 current_function_arg_info = p->arg_info;
8869 current_function_returns_value = p->returns_value;
8870 current_function_returns_null = p->returns_null;
8871 current_function_returns_abnormally = p->returns_abnormally;
8872 warn_about_return_type = p->warn_about_return_type;
8875 /* The functions below are required for functionality of doing
8876 function at once processing in the C front end. Currently these
8877 functions are not called from anywhere in the C front end, but as
8878 these changes continue, that will change. */
8880 /* Returns the stmt_tree (if any) to which statements are currently
8881 being added. If there is no active statement-tree, NULL is
8885 current_stmt_tree (void)
8887 return &c_stmt_tree;
8890 /* Return the global value of T as a symbol. */
8893 identifier_global_value (tree t)
8895 struct c_binding *b;
8897 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
8898 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
8904 /* In C, the only C-linkage public declaration is at file scope. */
8907 c_linkage_bindings (tree name)
8909 return identifier_global_value (name);
8912 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8913 otherwise the name is found in ridpointers from RID_INDEX. */
8916 record_builtin_type (enum rid rid_index, const char *name, tree type)
8920 id = ridpointers[(int) rid_index];
8922 id = get_identifier (name);
8923 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
8925 if (debug_hooks->type_decl)
8926 debug_hooks->type_decl (decl, false);
8929 /* Build the void_list_node (void_type_node having been created). */
8931 build_void_list_node (void)
8933 tree t = build_tree_list (NULL_TREE, void_type_node);
8937 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8940 build_c_parm (struct c_declspecs *specs, tree attrs,
8941 struct c_declarator *declarator)
8943 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
8946 ret->declarator = declarator;
8950 /* Return a declarator with nested attributes. TARGET is the inner
8951 declarator to which these attributes apply. ATTRS are the
8954 struct c_declarator *
8955 build_attrs_declarator (tree attrs, struct c_declarator *target)
8957 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8958 ret->kind = cdk_attrs;
8959 ret->declarator = target;
8960 ret->u.attrs = attrs;
8964 /* Return a declarator for a function with arguments specified by ARGS
8965 and return type specified by TARGET. */
8967 struct c_declarator *
8968 build_function_declarator (struct c_arg_info *args,
8969 struct c_declarator *target)
8971 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8972 ret->kind = cdk_function;
8973 ret->declarator = target;
8974 ret->u.arg_info = args;
8978 /* Return a declarator for the identifier IDENT (which may be
8979 NULL_TREE for an abstract declarator). */
8981 struct c_declarator *
8982 build_id_declarator (tree ident)
8984 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8986 ret->declarator = 0;
8988 /* Default value - may get reset to a more precise location. */
8989 ret->id_loc = input_location;
8993 /* Return something to represent absolute declarators containing a *.
8994 TARGET is the absolute declarator that the * contains.
8995 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8996 to apply to the pointer type. */
8998 struct c_declarator *
8999 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
9000 struct c_declarator *target)
9004 struct c_declarator *itarget = target;
9005 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9006 if (type_quals_attrs)
9008 attrs = type_quals_attrs->attrs;
9009 quals = quals_from_declspecs (type_quals_attrs);
9010 if (attrs != NULL_TREE)
9011 itarget = build_attrs_declarator (attrs, target);
9013 ret->kind = cdk_pointer;
9014 ret->declarator = itarget;
9015 ret->u.pointer_quals = quals;
9019 /* Return a pointer to a structure for an empty list of declaration
9022 struct c_declspecs *
9023 build_null_declspecs (void)
9025 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
9026 memset (&ret->locations, 0, cdw_number_of_elements);
9031 ret->align_log = -1;
9032 ret->typespec_word = cts_none;
9033 ret->storage_class = csc_none;
9034 ret->expr_const_operands = true;
9035 ret->declspecs_seen_p = false;
9036 ret->typespec_kind = ctsk_none;
9037 ret->non_sc_seen_p = false;
9038 ret->typedef_p = false;
9039 ret->explicit_signed_p = false;
9040 ret->deprecated_p = false;
9041 ret->default_int_p = false;
9042 ret->long_p = false;
9043 ret->long_long_p = false;
9044 ret->short_p = false;
9045 ret->signed_p = false;
9046 ret->unsigned_p = false;
9047 ret->complex_p = false;
9048 ret->inline_p = false;
9049 ret->noreturn_p = false;
9050 ret->thread_p = false;
9051 ret->thread_gnu_p = false;
9052 ret->const_p = false;
9053 ret->volatile_p = false;
9054 ret->atomic_p = false;
9055 ret->restrict_p = false;
9056 ret->saturating_p = false;
9057 ret->alignas_p = false;
9058 ret->address_space = ADDR_SPACE_GENERIC;
9062 /* Add the address space ADDRSPACE to the declaration specifiers
9063 SPECS, returning SPECS. */
9065 struct c_declspecs *
9066 declspecs_add_addrspace (source_location location,
9067 struct c_declspecs *specs, addr_space_t as)
9069 specs->non_sc_seen_p = true;
9070 specs->declspecs_seen_p = true;
9072 if (!ADDR_SPACE_GENERIC_P (specs->address_space)
9073 && specs->address_space != as)
9074 error ("incompatible address space qualifiers %qs and %qs",
9075 c_addr_space_name (as),
9076 c_addr_space_name (specs->address_space));
9079 specs->address_space = as;
9080 specs->locations[cdw_address_space] = location;
9085 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9088 struct c_declspecs *
9089 declspecs_add_qual (source_location loc,
9090 struct c_declspecs *specs, tree qual)
9094 specs->non_sc_seen_p = true;
9095 specs->declspecs_seen_p = true;
9096 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
9097 && C_IS_RESERVED_WORD (qual));
9098 i = C_RID_CODE (qual);
9102 dupe = specs->const_p;
9103 specs->const_p = true;
9104 specs->locations[cdw_const] = loc;
9107 dupe = specs->volatile_p;
9108 specs->volatile_p = true;
9109 specs->locations[cdw_volatile] = loc;
9112 dupe = specs->restrict_p;
9113 specs->restrict_p = true;
9114 specs->locations[cdw_restrict] = loc;
9117 dupe = specs->atomic_p;
9118 specs->atomic_p = true;
9123 if (dupe && !flag_isoc99)
9124 pedwarn (loc, OPT_Wpedantic, "duplicate %qE", qual);
9128 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9131 struct c_declspecs *
9132 declspecs_add_type (location_t loc, struct c_declspecs *specs,
9133 struct c_typespec spec)
9135 tree type = spec.spec;
9136 specs->non_sc_seen_p = true;
9137 specs->declspecs_seen_p = true;
9138 specs->typespec_kind = spec.kind;
9139 if (TREE_DEPRECATED (type))
9140 specs->deprecated_p = true;
9142 /* Handle type specifier keywords. */
9143 if (TREE_CODE (type) == IDENTIFIER_NODE
9144 && C_IS_RESERVED_WORD (type)
9145 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
9147 enum rid i = C_RID_CODE (type);
9150 error_at (loc, "two or more data types in declaration specifiers");
9153 if ((int) i <= (int) RID_LAST_MODIFIER)
9155 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9160 if (specs->long_long_p)
9162 error_at (loc, "%<long long long%> is too long for GCC");
9167 if (specs->typespec_word == cts_double)
9170 ("both %<long long%> and %<double%> in "
9171 "declaration specifiers"));
9174 pedwarn_c90 (loc, OPT_Wlong_long,
9175 "ISO C90 does not support %<long long%>");
9176 specs->long_long_p = 1;
9177 specs->locations[cdw_long_long] = loc;
9182 ("both %<long%> and %<short%> in "
9183 "declaration specifiers"));
9184 else if (specs->typespec_word == cts_auto_type)
9186 ("both %<long%> and %<__auto_type%> in "
9187 "declaration specifiers"));
9188 else if (specs->typespec_word == cts_void)
9190 ("both %<long%> and %<void%> in "
9191 "declaration specifiers"));
9192 else if (specs->typespec_word == cts_int128)
9194 ("both %<long%> and %<__int128%> in "
9195 "declaration specifiers"));
9196 else if (specs->typespec_word == cts_bool)
9198 ("both %<long%> and %<_Bool%> in "
9199 "declaration specifiers"));
9200 else if (specs->typespec_word == cts_char)
9202 ("both %<long%> and %<char%> in "
9203 "declaration specifiers"));
9204 else if (specs->typespec_word == cts_float)
9206 ("both %<long%> and %<float%> in "
9207 "declaration specifiers"));
9208 else if (specs->typespec_word == cts_dfloat32)
9210 ("both %<long%> and %<_Decimal32%> in "
9211 "declaration specifiers"));
9212 else if (specs->typespec_word == cts_dfloat64)
9214 ("both %<long%> and %<_Decimal64%> in "
9215 "declaration specifiers"));
9216 else if (specs->typespec_word == cts_dfloat128)
9218 ("both %<long%> and %<_Decimal128%> in "
9219 "declaration specifiers"));
9222 specs->long_p = true;
9223 specs->locations[cdw_long] = loc;
9227 dupe = specs->short_p;
9230 ("both %<long%> and %<short%> in "
9231 "declaration specifiers"));
9232 else if (specs->typespec_word == cts_auto_type)
9234 ("both %<short%> and %<__auto_type%> in "
9235 "declaration specifiers"));
9236 else if (specs->typespec_word == cts_void)
9238 ("both %<short%> and %<void%> in "
9239 "declaration specifiers"));
9240 else if (specs->typespec_word == cts_int128)
9242 ("both %<short%> and %<__int128%> in "
9243 "declaration specifiers"));
9244 else if (specs->typespec_word == cts_bool)
9246 ("both %<short%> and %<_Bool%> in "
9247 "declaration specifiers"));
9248 else if (specs->typespec_word == cts_char)
9250 ("both %<short%> and %<char%> in "
9251 "declaration specifiers"));
9252 else if (specs->typespec_word == cts_float)
9254 ("both %<short%> and %<float%> in "
9255 "declaration specifiers"));
9256 else if (specs->typespec_word == cts_double)
9258 ("both %<short%> and %<double%> in "
9259 "declaration specifiers"));
9260 else if (specs->typespec_word == cts_dfloat32)
9262 ("both %<short%> and %<_Decimal32%> in "
9263 "declaration specifiers"));
9264 else if (specs->typespec_word == cts_dfloat64)
9266 ("both %<short%> and %<_Decimal64%> in "
9267 "declaration specifiers"));
9268 else if (specs->typespec_word == cts_dfloat128)
9270 ("both %<short%> and %<_Decimal128%> in "
9271 "declaration specifiers"));
9274 specs->short_p = true;
9275 specs->locations[cdw_short] = loc;
9279 dupe = specs->signed_p;
9280 if (specs->unsigned_p)
9282 ("both %<signed%> and %<unsigned%> in "
9283 "declaration specifiers"));
9284 else if (specs->typespec_word == cts_auto_type)
9286 ("both %<signed%> and %<__auto_type%> in "
9287 "declaration specifiers"));
9288 else if (specs->typespec_word == cts_void)
9290 ("both %<signed%> and %<void%> in "
9291 "declaration specifiers"));
9292 else if (specs->typespec_word == cts_bool)
9294 ("both %<signed%> and %<_Bool%> in "
9295 "declaration specifiers"));
9296 else if (specs->typespec_word == cts_float)
9298 ("both %<signed%> and %<float%> in "
9299 "declaration specifiers"));
9300 else if (specs->typespec_word == cts_double)
9302 ("both %<signed%> and %<double%> in "
9303 "declaration specifiers"));
9304 else if (specs->typespec_word == cts_dfloat32)
9306 ("both %<signed%> and %<_Decimal32%> in "
9307 "declaration specifiers"));
9308 else if (specs->typespec_word == cts_dfloat64)
9310 ("both %<signed%> and %<_Decimal64%> in "
9311 "declaration specifiers"));
9312 else if (specs->typespec_word == cts_dfloat128)
9314 ("both %<signed%> and %<_Decimal128%> in "
9315 "declaration specifiers"));
9318 specs->signed_p = true;
9319 specs->locations[cdw_signed] = loc;
9323 dupe = specs->unsigned_p;
9324 if (specs->signed_p)
9326 ("both %<signed%> and %<unsigned%> in "
9327 "declaration specifiers"));
9328 else if (specs->typespec_word == cts_auto_type)
9330 ("both %<unsigned%> and %<__auto_type%> in "
9331 "declaration specifiers"));
9332 else if (specs->typespec_word == cts_void)
9334 ("both %<unsigned%> and %<void%> in "
9335 "declaration specifiers"));
9336 else if (specs->typespec_word == cts_bool)
9338 ("both %<unsigned%> and %<_Bool%> in "
9339 "declaration specifiers"));
9340 else if (specs->typespec_word == cts_float)
9342 ("both %<unsigned%> and %<float%> in "
9343 "declaration specifiers"));
9344 else if (specs->typespec_word == cts_double)
9346 ("both %<unsigned%> and %<double%> in "
9347 "declaration specifiers"));
9348 else if (specs->typespec_word == cts_dfloat32)
9350 ("both %<unsigned%> and %<_Decimal32%> in "
9351 "declaration specifiers"));
9352 else if (specs->typespec_word == cts_dfloat64)
9354 ("both %<unsigned%> and %<_Decimal64%> in "
9355 "declaration specifiers"));
9356 else if (specs->typespec_word == cts_dfloat128)
9358 ("both %<unsigned%> and %<_Decimal128%> in "
9359 "declaration specifiers"));
9362 specs->unsigned_p = true;
9363 specs->locations[cdw_unsigned] = loc;
9367 dupe = specs->complex_p;
9368 if (!flag_isoc99 && !in_system_header_at (loc))
9369 pedwarn (loc, OPT_Wpedantic,
9370 "ISO C90 does not support complex types");
9371 if (specs->typespec_word == cts_auto_type)
9373 ("both %<complex%> and %<__auto_type%> in "
9374 "declaration specifiers"));
9375 else if (specs->typespec_word == cts_void)
9377 ("both %<complex%> and %<void%> in "
9378 "declaration specifiers"));
9379 else if (specs->typespec_word == cts_bool)
9381 ("both %<complex%> and %<_Bool%> in "
9382 "declaration specifiers"));
9383 else if (specs->typespec_word == cts_dfloat32)
9385 ("both %<complex%> and %<_Decimal32%> in "
9386 "declaration specifiers"));
9387 else if (specs->typespec_word == cts_dfloat64)
9389 ("both %<complex%> and %<_Decimal64%> in "
9390 "declaration specifiers"));
9391 else if (specs->typespec_word == cts_dfloat128)
9393 ("both %<complex%> and %<_Decimal128%> in "
9394 "declaration specifiers"));
9395 else if (specs->typespec_word == cts_fract)
9397 ("both %<complex%> and %<_Fract%> in "
9398 "declaration specifiers"));
9399 else if (specs->typespec_word == cts_accum)
9401 ("both %<complex%> and %<_Accum%> in "
9402 "declaration specifiers"));
9403 else if (specs->saturating_p)
9405 ("both %<complex%> and %<_Sat%> in "
9406 "declaration specifiers"));
9409 specs->complex_p = true;
9410 specs->locations[cdw_complex] = loc;
9414 dupe = specs->saturating_p;
9415 pedwarn (loc, OPT_Wpedantic,
9416 "ISO C does not support saturating types");
9417 if (specs->typespec_word == cts_int128)
9420 ("both %<_Sat%> and %<__int128%> in "
9421 "declaration specifiers"));
9423 else if (specs->typespec_word == cts_auto_type)
9425 ("both %<_Sat%> and %<__auto_type%> in "
9426 "declaration specifiers"));
9427 else if (specs->typespec_word == cts_void)
9429 ("both %<_Sat%> and %<void%> in "
9430 "declaration specifiers"));
9431 else if (specs->typespec_word == cts_bool)
9433 ("both %<_Sat%> and %<_Bool%> in "
9434 "declaration specifiers"));
9435 else if (specs->typespec_word == cts_char)
9437 ("both %<_Sat%> and %<char%> in "
9438 "declaration specifiers"));
9439 else if (specs->typespec_word == cts_int)
9441 ("both %<_Sat%> and %<int%> in "
9442 "declaration specifiers"));
9443 else if (specs->typespec_word == cts_float)
9445 ("both %<_Sat%> and %<float%> in "
9446 "declaration specifiers"));
9447 else if (specs->typespec_word == cts_double)
9449 ("both %<_Sat%> and %<double%> in "
9450 "declaration specifiers"));
9451 else if (specs->typespec_word == cts_dfloat32)
9453 ("both %<_Sat%> and %<_Decimal32%> in "
9454 "declaration specifiers"));
9455 else if (specs->typespec_word == cts_dfloat64)
9457 ("both %<_Sat%> and %<_Decimal64%> in "
9458 "declaration specifiers"));
9459 else if (specs->typespec_word == cts_dfloat128)
9461 ("both %<_Sat%> and %<_Decimal128%> in "
9462 "declaration specifiers"));
9463 else if (specs->complex_p)
9465 ("both %<_Sat%> and %<complex%> in "
9466 "declaration specifiers"));
9469 specs->saturating_p = true;
9470 specs->locations[cdw_saturating] = loc;
9478 error_at (loc, "duplicate %qE", type);
9484 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9485 "__int128", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9487 if (specs->typespec_word != cts_none)
9490 "two or more data types in declaration specifiers");
9498 ("both %<long%> and %<__auto_type%> in "
9499 "declaration specifiers"));
9500 else if (specs->short_p)
9502 ("both %<short%> and %<__auto_type%> in "
9503 "declaration specifiers"));
9504 else if (specs->signed_p)
9506 ("both %<signed%> and %<__auto_type%> in "
9507 "declaration specifiers"));
9508 else if (specs->unsigned_p)
9510 ("both %<unsigned%> and %<__auto_type%> in "
9511 "declaration specifiers"));
9512 else if (specs->complex_p)
9514 ("both %<complex%> and %<__auto_type%> in "
9515 "declaration specifiers"));
9516 else if (specs->saturating_p)
9518 ("both %<_Sat%> and %<__auto_type%> in "
9519 "declaration specifiers"));
9522 specs->typespec_word = cts_auto_type;
9523 specs->locations[cdw_typespec] = loc;
9527 if (int128_integer_type_node == NULL_TREE)
9529 error_at (loc, "%<__int128%> is not supported for this target");
9532 if (!in_system_header_at (input_location))
9533 pedwarn (loc, OPT_Wpedantic,
9534 "ISO C does not support %<__int128%> type");
9538 ("both %<__int128%> and %<long%> in "
9539 "declaration specifiers"));
9540 else if (specs->saturating_p)
9542 ("both %<_Sat%> and %<__int128%> in "
9543 "declaration specifiers"));
9544 else if (specs->short_p)
9546 ("both %<__int128%> and %<short%> in "
9547 "declaration specifiers"));
9550 specs->typespec_word = cts_int128;
9551 specs->locations[cdw_typespec] = loc;
9557 ("both %<long%> and %<void%> in "
9558 "declaration specifiers"));
9559 else if (specs->short_p)
9561 ("both %<short%> and %<void%> in "
9562 "declaration specifiers"));
9563 else if (specs->signed_p)
9565 ("both %<signed%> and %<void%> in "
9566 "declaration specifiers"));
9567 else if (specs->unsigned_p)
9569 ("both %<unsigned%> and %<void%> in "
9570 "declaration specifiers"));
9571 else if (specs->complex_p)
9573 ("both %<complex%> and %<void%> in "
9574 "declaration specifiers"));
9575 else if (specs->saturating_p)
9577 ("both %<_Sat%> and %<void%> in "
9578 "declaration specifiers"));
9581 specs->typespec_word = cts_void;
9582 specs->locations[cdw_typespec] = loc;
9586 if (!flag_isoc99 && !in_system_header_at (loc))
9587 pedwarn (loc, OPT_Wpedantic,
9588 "ISO C90 does not support boolean types");
9591 ("both %<long%> and %<_Bool%> in "
9592 "declaration specifiers"));
9593 else if (specs->short_p)
9595 ("both %<short%> and %<_Bool%> in "
9596 "declaration specifiers"));
9597 else if (specs->signed_p)
9599 ("both %<signed%> and %<_Bool%> in "
9600 "declaration specifiers"));
9601 else if (specs->unsigned_p)
9603 ("both %<unsigned%> and %<_Bool%> in "
9604 "declaration specifiers"));
9605 else if (specs->complex_p)
9607 ("both %<complex%> and %<_Bool%> in "
9608 "declaration specifiers"));
9609 else if (specs->saturating_p)
9611 ("both %<_Sat%> and %<_Bool%> in "
9612 "declaration specifiers"));
9615 specs->typespec_word = cts_bool;
9616 specs->locations[cdw_typespec] = loc;
9622 ("both %<long%> and %<char%> in "
9623 "declaration specifiers"));
9624 else if (specs->short_p)
9626 ("both %<short%> and %<char%> in "
9627 "declaration specifiers"));
9628 else if (specs->saturating_p)
9630 ("both %<_Sat%> and %<char%> in "
9631 "declaration specifiers"));
9634 specs->typespec_word = cts_char;
9635 specs->locations[cdw_typespec] = loc;
9639 if (specs->saturating_p)
9641 ("both %<_Sat%> and %<int%> in "
9642 "declaration specifiers"));
9645 specs->typespec_word = cts_int;
9646 specs->locations[cdw_typespec] = loc;
9652 ("both %<long%> and %<float%> in "
9653 "declaration specifiers"));
9654 else if (specs->short_p)
9656 ("both %<short%> and %<float%> in "
9657 "declaration specifiers"));
9658 else if (specs->signed_p)
9660 ("both %<signed%> and %<float%> in "
9661 "declaration specifiers"));
9662 else if (specs->unsigned_p)
9664 ("both %<unsigned%> and %<float%> in "
9665 "declaration specifiers"));
9666 else if (specs->saturating_p)
9668 ("both %<_Sat%> and %<float%> in "
9669 "declaration specifiers"));
9672 specs->typespec_word = cts_float;
9673 specs->locations[cdw_typespec] = loc;
9677 if (specs->long_long_p)
9679 ("both %<long long%> and %<double%> in "
9680 "declaration specifiers"));
9681 else if (specs->short_p)
9683 ("both %<short%> and %<double%> in "
9684 "declaration specifiers"));
9685 else if (specs->signed_p)
9687 ("both %<signed%> and %<double%> in "
9688 "declaration specifiers"));
9689 else if (specs->unsigned_p)
9691 ("both %<unsigned%> and %<double%> in "
9692 "declaration specifiers"));
9693 else if (specs->saturating_p)
9695 ("both %<_Sat%> and %<double%> in "
9696 "declaration specifiers"));
9699 specs->typespec_word = cts_double;
9700 specs->locations[cdw_typespec] = loc;
9708 if (i == RID_DFLOAT32)
9710 else if (i == RID_DFLOAT64)
9713 str = "_Decimal128";
9714 if (specs->long_long_p)
9716 ("both %<long long%> and %<%s%> in "
9717 "declaration specifiers"),
9721 ("both %<long%> and %<%s%> in "
9722 "declaration specifiers"),
9724 else if (specs->short_p)
9726 ("both %<short%> and %<%s%> in "
9727 "declaration specifiers"),
9729 else if (specs->signed_p)
9731 ("both %<signed%> and %<%s%> in "
9732 "declaration specifiers"),
9734 else if (specs->unsigned_p)
9736 ("both %<unsigned%> and %<%s%> in "
9737 "declaration specifiers"),
9739 else if (specs->complex_p)
9741 ("both %<complex%> and %<%s%> in "
9742 "declaration specifiers"),
9744 else if (specs->saturating_p)
9746 ("both %<_Sat%> and %<%s%> in "
9747 "declaration specifiers"),
9749 else if (i == RID_DFLOAT32)
9750 specs->typespec_word = cts_dfloat32;
9751 else if (i == RID_DFLOAT64)
9752 specs->typespec_word = cts_dfloat64;
9754 specs->typespec_word = cts_dfloat128;
9755 specs->locations[cdw_typespec] = loc;
9757 if (!targetm.decimal_float_supported_p ())
9759 ("decimal floating point not supported "
9760 "for this target"));
9761 pedwarn (loc, OPT_Wpedantic,
9762 "ISO C does not support decimal floating point");
9772 if (specs->complex_p)
9774 ("both %<complex%> and %<%s%> in "
9775 "declaration specifiers"),
9777 else if (i == RID_FRACT)
9778 specs->typespec_word = cts_fract;
9780 specs->typespec_word = cts_accum;
9781 specs->locations[cdw_typespec] = loc;
9783 if (!targetm.fixed_point_supported_p ())
9785 "fixed-point types not supported for this target");
9786 pedwarn (loc, OPT_Wpedantic,
9787 "ISO C does not support fixed-point types");
9790 /* ObjC reserved word "id", handled below. */
9796 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9797 form of ObjC type, cases such as "int" and "long" being handled
9798 above), a TYPE (struct, union, enum and typeof specifiers) or an
9799 ERROR_MARK. In none of these cases may there have previously
9800 been any type specifiers. */
9801 if (specs->type || specs->typespec_word != cts_none
9802 || specs->long_p || specs->short_p || specs->signed_p
9803 || specs->unsigned_p || specs->complex_p)
9804 error_at (loc, "two or more data types in declaration specifiers");
9805 else if (TREE_CODE (type) == TYPE_DECL)
9807 if (TREE_TYPE (type) == error_mark_node)
9808 ; /* Allow the type to default to int to avoid cascading errors. */
9811 specs->type = TREE_TYPE (type);
9812 specs->decl_attr = DECL_ATTRIBUTES (type);
9813 specs->typedef_p = true;
9814 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
9815 specs->locations[cdw_typedef] = loc;
9817 /* If this typedef name is defined in a struct, then a C++
9818 lookup would return a different value. */
9820 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
9821 warning_at (loc, OPT_Wc___compat,
9822 "C++ lookup of %qD would return a field, not a type",
9825 /* If we are parsing a struct, record that a struct field
9827 if (warn_cxx_compat && struct_parse_info != NULL)
9828 struct_parse_info->typedefs_seen.safe_push (type);
9831 else if (TREE_CODE (type) == IDENTIFIER_NODE)
9833 tree t = lookup_name (type);
9834 if (!t || TREE_CODE (t) != TYPE_DECL)
9835 error_at (loc, "%qE fails to be a typedef or built in type", type);
9836 else if (TREE_TYPE (t) == error_mark_node)
9840 specs->type = TREE_TYPE (t);
9841 specs->locations[cdw_typespec] = loc;
9846 if (TREE_CODE (type) != ERROR_MARK && spec.kind == ctsk_typeof)
9848 specs->typedef_p = true;
9849 specs->locations[cdw_typedef] = loc;
9853 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
9854 specs->expr, spec.expr);
9856 specs->expr = spec.expr;
9857 specs->expr_const_operands &= spec.expr_const_operands;
9866 /* Add the storage class specifier or function specifier SCSPEC to the
9867 declaration specifiers SPECS, returning SPECS. */
9869 struct c_declspecs *
9870 declspecs_add_scspec (source_location loc,
9871 struct c_declspecs *specs,
9875 enum c_storage_class n = csc_none;
9877 specs->declspecs_seen_p = true;
9878 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
9879 && C_IS_RESERVED_WORD (scspec));
9880 i = C_RID_CODE (scspec);
9881 if (specs->non_sc_seen_p)
9882 warning (OPT_Wold_style_declaration,
9883 "%qE is not at beginning of declaration", scspec);
9887 /* C99 permits duplicate inline. Although of doubtful utility,
9888 it seems simplest to permit it in gnu89 mode as well, as
9889 there is also little utility in maintaining this as a
9890 difference between gnu89 and C99 inline. */
9892 specs->inline_p = true;
9893 specs->locations[cdw_inline] = loc;
9896 /* Duplicate _Noreturn is permitted. */
9898 specs->noreturn_p = true;
9899 specs->locations[cdw_noreturn] = loc;
9902 dupe = specs->thread_p;
9903 if (specs->storage_class == csc_auto)
9904 error ("%qE used with %<auto%>", scspec);
9905 else if (specs->storage_class == csc_register)
9906 error ("%qE used with %<register%>", scspec);
9907 else if (specs->storage_class == csc_typedef)
9908 error ("%qE used with %<typedef%>", scspec);
9911 specs->thread_p = true;
9912 specs->thread_gnu_p = (strcmp (IDENTIFIER_POINTER (scspec),
9914 /* A diagnostic is not required for the use of this
9915 identifier in the implementation namespace; only diagnose
9916 it for the C11 spelling because of existing code using
9917 the other spelling. */
9918 if (!flag_isoc11 && !specs->thread_gnu_p)
9921 pedwarn (loc, OPT_Wpedantic,
9922 "ISO C99 does not support %qE", scspec);
9924 pedwarn (loc, OPT_Wpedantic,
9925 "ISO C90 does not support %qE", scspec);
9927 specs->locations[cdw_thread] = loc;
9935 /* Diagnose "__thread extern". */
9936 if (specs->thread_p && specs->thread_gnu_p)
9937 error ("%<__thread%> before %<extern%>");
9944 /* Diagnose "__thread static". */
9945 if (specs->thread_p && specs->thread_gnu_p)
9946 error ("%<__thread%> before %<static%>");
9954 if (n != csc_none && n == specs->storage_class)
9958 if (i == RID_THREAD)
9959 error ("duplicate %<_Thread_local%> or %<__thread%>");
9961 error ("duplicate %qE", scspec);
9965 if (specs->storage_class != csc_none && n != specs->storage_class)
9967 error ("multiple storage classes in declaration specifiers");
9971 specs->storage_class = n;
9972 specs->locations[cdw_storage_class] = loc;
9973 if (n != csc_extern && n != csc_static && specs->thread_p)
9975 error ("%qs used with %qE",
9976 specs->thread_gnu_p ? "__thread" : "_Thread_local",
9978 specs->thread_p = false;
9985 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9988 struct c_declspecs *
9989 declspecs_add_attrs (source_location loc, struct c_declspecs *specs, tree attrs)
9991 specs->attrs = chainon (attrs, specs->attrs);
9992 specs->locations[cdw_attributes] = loc;
9993 specs->declspecs_seen_p = true;
9997 /* Add an _Alignas specifier (expression ALIGN, or type whose
9998 alignment is ALIGN) to the declaration specifiers SPECS, returning
10000 struct c_declspecs *
10001 declspecs_add_alignas (source_location loc,
10002 struct c_declspecs *specs, tree align)
10005 specs->alignas_p = true;
10006 specs->locations[cdw_alignas] = loc;
10007 if (align == error_mark_node)
10009 align_log = check_user_alignment (align, true);
10010 if (align_log > specs->align_log)
10011 specs->align_log = align_log;
10015 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10016 specifiers with any other type specifier to determine the resulting
10017 type. This is where ISO C checks on complex types are made, since
10018 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10021 struct c_declspecs *
10022 finish_declspecs (struct c_declspecs *specs)
10024 /* If a type was specified as a whole, we have no modifiers and are
10026 if (specs->type != NULL_TREE)
10028 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
10029 && !specs->signed_p && !specs->unsigned_p
10030 && !specs->complex_p);
10032 /* Set a dummy type. */
10033 if (TREE_CODE (specs->type) == ERROR_MARK)
10034 specs->type = integer_type_node;
10038 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10039 has been specified, treat it as "int" unless "_Complex" is
10040 present and there are no other specifiers. If we just have
10041 "_Complex", it is equivalent to "_Complex double", but e.g.
10042 "_Complex short" is equivalent to "_Complex short int". */
10043 if (specs->typespec_word == cts_none)
10045 if (specs->saturating_p)
10047 error_at (specs->locations[cdw_saturating],
10048 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10049 if (!targetm.fixed_point_supported_p ())
10050 error_at (specs->locations[cdw_saturating],
10051 "fixed-point types not supported for this target");
10052 specs->typespec_word = cts_fract;
10054 else if (specs->long_p || specs->short_p
10055 || specs->signed_p || specs->unsigned_p)
10057 specs->typespec_word = cts_int;
10059 else if (specs->complex_p)
10061 specs->typespec_word = cts_double;
10062 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10063 "ISO C does not support plain %<complex%> meaning "
10064 "%<double complex%>");
10068 specs->typespec_word = cts_int;
10069 specs->default_int_p = true;
10070 /* We don't diagnose this here because grokdeclarator will
10071 give more specific diagnostics according to whether it is
10072 a function definition. */
10076 /* If "signed" was specified, record this to distinguish "int" and
10077 "signed int" in the case of a bit-field with
10078 -funsigned-bitfields. */
10079 specs->explicit_signed_p = specs->signed_p;
10081 /* Now compute the actual type. */
10082 switch (specs->typespec_word)
10084 case cts_auto_type:
10085 gcc_assert (!specs->long_p && !specs->short_p
10086 && !specs->signed_p && !specs->unsigned_p
10087 && !specs->complex_p);
10088 /* Type to be filled in later. */
10091 gcc_assert (!specs->long_p && !specs->short_p
10092 && !specs->signed_p && !specs->unsigned_p
10093 && !specs->complex_p);
10094 specs->type = void_type_node;
10097 gcc_assert (!specs->long_p && !specs->short_p
10098 && !specs->signed_p && !specs->unsigned_p
10099 && !specs->complex_p);
10100 specs->type = boolean_type_node;
10103 gcc_assert (!specs->long_p && !specs->short_p);
10104 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10105 if (specs->signed_p)
10106 specs->type = signed_char_type_node;
10107 else if (specs->unsigned_p)
10108 specs->type = unsigned_char_type_node;
10110 specs->type = char_type_node;
10111 if (specs->complex_p)
10113 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10114 "ISO C does not support complex integer types");
10115 specs->type = build_complex_type (specs->type);
10119 gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p);
10120 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10121 specs->type = (specs->unsigned_p
10122 ? int128_unsigned_type_node
10123 : int128_integer_type_node);
10124 if (specs->complex_p)
10126 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10127 "ISO C does not support complex integer types");
10128 specs->type = build_complex_type (specs->type);
10132 gcc_assert (!(specs->long_p && specs->short_p));
10133 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10134 if (specs->long_long_p)
10135 specs->type = (specs->unsigned_p
10136 ? long_long_unsigned_type_node
10137 : long_long_integer_type_node);
10138 else if (specs->long_p)
10139 specs->type = (specs->unsigned_p
10140 ? long_unsigned_type_node
10141 : long_integer_type_node);
10142 else if (specs->short_p)
10143 specs->type = (specs->unsigned_p
10144 ? short_unsigned_type_node
10145 : short_integer_type_node);
10147 specs->type = (specs->unsigned_p
10148 ? unsigned_type_node
10149 : integer_type_node);
10150 if (specs->complex_p)
10152 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10153 "ISO C does not support complex integer types");
10154 specs->type = build_complex_type (specs->type);
10158 gcc_assert (!specs->long_p && !specs->short_p
10159 && !specs->signed_p && !specs->unsigned_p);
10160 specs->type = (specs->complex_p
10161 ? complex_float_type_node
10162 : float_type_node);
10165 gcc_assert (!specs->long_long_p && !specs->short_p
10166 && !specs->signed_p && !specs->unsigned_p);
10169 specs->type = (specs->complex_p
10170 ? complex_long_double_type_node
10171 : long_double_type_node);
10175 specs->type = (specs->complex_p
10176 ? complex_double_type_node
10177 : double_type_node);
10182 case cts_dfloat128:
10183 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
10184 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
10185 if (specs->typespec_word == cts_dfloat32)
10186 specs->type = dfloat32_type_node;
10187 else if (specs->typespec_word == cts_dfloat64)
10188 specs->type = dfloat64_type_node;
10190 specs->type = dfloat128_type_node;
10193 gcc_assert (!specs->complex_p);
10194 if (!targetm.fixed_point_supported_p ())
10195 specs->type = integer_type_node;
10196 else if (specs->saturating_p)
10198 if (specs->long_long_p)
10199 specs->type = specs->unsigned_p
10200 ? sat_unsigned_long_long_fract_type_node
10201 : sat_long_long_fract_type_node;
10202 else if (specs->long_p)
10203 specs->type = specs->unsigned_p
10204 ? sat_unsigned_long_fract_type_node
10205 : sat_long_fract_type_node;
10206 else if (specs->short_p)
10207 specs->type = specs->unsigned_p
10208 ? sat_unsigned_short_fract_type_node
10209 : sat_short_fract_type_node;
10211 specs->type = specs->unsigned_p
10212 ? sat_unsigned_fract_type_node
10213 : sat_fract_type_node;
10217 if (specs->long_long_p)
10218 specs->type = specs->unsigned_p
10219 ? unsigned_long_long_fract_type_node
10220 : long_long_fract_type_node;
10221 else if (specs->long_p)
10222 specs->type = specs->unsigned_p
10223 ? unsigned_long_fract_type_node
10224 : long_fract_type_node;
10225 else if (specs->short_p)
10226 specs->type = specs->unsigned_p
10227 ? unsigned_short_fract_type_node
10228 : short_fract_type_node;
10230 specs->type = specs->unsigned_p
10231 ? unsigned_fract_type_node
10236 gcc_assert (!specs->complex_p);
10237 if (!targetm.fixed_point_supported_p ())
10238 specs->type = integer_type_node;
10239 else if (specs->saturating_p)
10241 if (specs->long_long_p)
10242 specs->type = specs->unsigned_p
10243 ? sat_unsigned_long_long_accum_type_node
10244 : sat_long_long_accum_type_node;
10245 else if (specs->long_p)
10246 specs->type = specs->unsigned_p
10247 ? sat_unsigned_long_accum_type_node
10248 : sat_long_accum_type_node;
10249 else if (specs->short_p)
10250 specs->type = specs->unsigned_p
10251 ? sat_unsigned_short_accum_type_node
10252 : sat_short_accum_type_node;
10254 specs->type = specs->unsigned_p
10255 ? sat_unsigned_accum_type_node
10256 : sat_accum_type_node;
10260 if (specs->long_long_p)
10261 specs->type = specs->unsigned_p
10262 ? unsigned_long_long_accum_type_node
10263 : long_long_accum_type_node;
10264 else if (specs->long_p)
10265 specs->type = specs->unsigned_p
10266 ? unsigned_long_accum_type_node
10267 : long_accum_type_node;
10268 else if (specs->short_p)
10269 specs->type = specs->unsigned_p
10270 ? unsigned_short_accum_type_node
10271 : short_accum_type_node;
10273 specs->type = specs->unsigned_p
10274 ? unsigned_accum_type_node
10279 gcc_unreachable ();
10285 /* A subroutine of c_write_global_declarations. Perform final processing
10286 on one file scope's declarations (or the external scope's declarations),
10290 c_write_global_declarations_1 (tree globals)
10295 /* Process the decls in the order they were written. */
10296 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10298 /* Check for used but undefined static functions using the C
10299 standard's definition of "used", and set TREE_NO_WARNING so
10300 that check_global_declarations doesn't repeat the check. */
10301 if (TREE_CODE (decl) == FUNCTION_DECL
10302 && DECL_INITIAL (decl) == 0
10303 && DECL_EXTERNAL (decl)
10304 && !TREE_PUBLIC (decl)
10305 && C_DECL_USED (decl))
10307 pedwarn (input_location, 0, "%q+F used but never defined", decl);
10308 TREE_NO_WARNING (decl) = 1;
10311 wrapup_global_declaration_1 (decl);
10316 reconsider = false;
10317 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10318 reconsider |= wrapup_global_declaration_2 (decl);
10320 while (reconsider);
10322 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10323 check_global_declaration_1 (decl);
10326 /* A subroutine of c_write_global_declarations Emit debug information for each
10327 of the declarations in GLOBALS. */
10330 c_write_global_declarations_2 (tree globals)
10334 for (decl = globals; decl ; decl = DECL_CHAIN (decl))
10335 debug_hooks->global_decl (decl);
10338 /* Callback to collect a source_ref from a DECL. */
10341 collect_source_ref_cb (tree decl)
10343 if (!DECL_IS_BUILTIN (decl))
10344 collect_source_ref (LOCATION_FILE (decl_sloc (decl, false)));
10347 /* Preserve the external declarations scope across a garbage collect. */
10348 static GTY(()) tree ext_block;
10350 /* Collect all references relevant to SOURCE_FILE. */
10353 collect_all_refs (const char *source_file)
10358 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10359 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file);
10361 collect_ada_nodes (BLOCK_VARS (ext_block), source_file);
10364 /* Iterate over all global declarations and call CALLBACK. */
10367 for_each_global_decl (void (*callback) (tree decl))
10374 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10376 decls = DECL_INITIAL (t);
10377 for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl))
10381 for (decl = BLOCK_VARS (ext_block); decl; decl = TREE_CHAIN (decl))
10386 c_write_global_declarations (void)
10391 /* We don't want to do this if generating a PCH. */
10395 timevar_start (TV_PHASE_DEFERRED);
10397 /* Do the Objective-C stuff. This is where all the Objective-C
10398 module stuff gets generated (symtab, class/protocol/selector
10400 if (c_dialect_objc ())
10401 objc_write_global_declarations ();
10403 /* Close the external scope. */
10404 ext_block = pop_scope ();
10405 external_scope = 0;
10406 gcc_assert (!current_scope);
10408 /* Handle -fdump-ada-spec[-slim]. */
10409 if (flag_dump_ada_spec || flag_dump_ada_spec_slim)
10411 /* Build a table of files to generate specs for */
10412 if (flag_dump_ada_spec_slim)
10413 collect_source_ref (main_input_filename);
10415 for_each_global_decl (collect_source_ref_cb);
10417 dump_ada_specs (collect_all_refs, NULL);
10422 tree tmp = BLOCK_VARS (ext_block);
10424 FILE * stream = dump_begin (TDI_tu, &flags);
10427 dump_node (tmp, flags & ~TDF_SLIM, stream);
10428 dump_end (TDI_tu, stream);
10432 /* Process all file scopes in this compilation, and the external_scope,
10433 through wrapup_global_declarations and check_global_declarations. */
10434 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10435 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
10436 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
10438 timevar_stop (TV_PHASE_DEFERRED);
10439 timevar_start (TV_PHASE_OPT_GEN);
10441 /* We're done parsing; proceed to optimize and emit assembly.
10442 FIXME: shouldn't be the front end's responsibility to call this. */
10443 finalize_compilation_unit ();
10445 timevar_stop (TV_PHASE_OPT_GEN);
10446 timevar_start (TV_PHASE_DBGINFO);
10448 /* After cgraph has had a chance to emit everything that's going to
10449 be emitted, output debug information for globals. */
10450 if (!seen_error ())
10452 timevar_push (TV_SYMOUT);
10453 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10454 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
10455 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
10456 timevar_pop (TV_SYMOUT);
10460 timevar_stop (TV_PHASE_DBGINFO);
10463 /* Register reserved keyword WORD as qualifier for address space AS. */
10466 c_register_addr_space (const char *word, addr_space_t as)
10468 int rid = RID_FIRST_ADDR_SPACE + as;
10471 /* Address space qualifiers are only supported
10472 in C with GNU extensions enabled. */
10473 if (c_dialect_objc () || flag_no_asm)
10476 id = get_identifier (word);
10477 C_SET_RID_CODE (id, rid);
10478 C_IS_RESERVED_WORD (id) = 1;
10479 ridpointers [rid] = id;
10482 /* Return identifier to look up for omp declare reduction. */
10485 c_omp_reduction_id (enum tree_code reduction_code, tree reduction_id)
10487 const char *p = NULL;
10488 switch (reduction_code)
10490 case PLUS_EXPR: p = "+"; break;
10491 case MULT_EXPR: p = "*"; break;
10492 case MINUS_EXPR: p = "-"; break;
10493 case BIT_AND_EXPR: p = "&"; break;
10494 case BIT_XOR_EXPR: p = "^"; break;
10495 case BIT_IOR_EXPR: p = "|"; break;
10496 case TRUTH_ANDIF_EXPR: p = "&&"; break;
10497 case TRUTH_ORIF_EXPR: p = "||"; break;
10498 case MIN_EXPR: p = "min"; break;
10499 case MAX_EXPR: p = "max"; break;
10506 if (TREE_CODE (reduction_id) != IDENTIFIER_NODE)
10507 return error_mark_node;
10508 p = IDENTIFIER_POINTER (reduction_id);
10511 const char prefix[] = "omp declare reduction ";
10512 size_t lenp = sizeof (prefix);
10513 size_t len = strlen (p);
10514 char *name = XALLOCAVEC (char, lenp + len);
10515 memcpy (name, prefix, lenp - 1);
10516 memcpy (name + lenp - 1, p, len + 1);
10517 return get_identifier (name);
10520 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10521 VAR_DECL, bind it into the current scope and return it. */
10524 c_omp_reduction_decl (tree reduction_id)
10526 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
10527 if (b != NULL && B_IN_CURRENT_SCOPE (b))
10530 tree decl = build_decl (BUILTINS_LOCATION, VAR_DECL,
10531 reduction_id, integer_type_node);
10532 DECL_ARTIFICIAL (decl) = 1;
10533 DECL_EXTERNAL (decl) = 1;
10534 TREE_STATIC (decl) = 1;
10535 TREE_PUBLIC (decl) = 0;
10536 bind (reduction_id, decl, current_scope, true, false, BUILTINS_LOCATION);
10540 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10543 c_omp_reduction_lookup (tree reduction_id, tree type)
10545 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
10549 for (t = DECL_INITIAL (b->decl); t; t = TREE_CHAIN (t))
10550 if (comptypes (TREE_PURPOSE (t), type))
10551 return TREE_VALUE (t);
10554 return error_mark_node;
10557 /* Helper function called via walk_tree, to diagnose invalid
10558 #pragma omp declare reduction combiners or initializers. */
10561 c_check_omp_declare_reduction_r (tree *tp, int *, void *data)
10563 tree *vars = (tree *) data;
10564 if (SSA_VAR_P (*tp)
10565 && !DECL_ARTIFICIAL (*tp)
10569 location_t loc = DECL_SOURCE_LOCATION (vars[0]);
10570 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars[0])), "omp_out") == 0)
10571 error_at (loc, "%<#pragma omp declare reduction%> combiner refers to "
10572 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10575 error_at (loc, "%<#pragma omp declare reduction%> initializer refers "
10576 "to variable %qD which is not %<omp_priv%> nor "
10584 #include "gt-c-c-decl.h"