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"
67 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
69 { NORMAL, /* Ordinary declaration */
70 FUNCDEF, /* Function definition */
71 PARM, /* Declaration of parm before function body */
72 FIELD, /* Declaration inside struct or union */
73 TYPENAME}; /* Typename (inside cast or sizeof) */
75 /* States indicating how grokdeclarator() should handle declspecs marked
76 with __attribute__((deprecated)). An object declared as
77 __attribute__((deprecated)) suppresses warnings of uses of other
80 enum deprecated_states {
86 /* Nonzero if we have seen an invalid cross reference
87 to a struct, union, or enum, but not yet printed the message. */
88 tree pending_invalid_xref;
90 /* File and line to appear in the eventual error message. */
91 location_t pending_invalid_xref_location;
93 /* The file and line that the prototype came from if this is an
94 old-style definition; used for diagnostics in
95 store_parm_decls_oldstyle. */
97 static location_t current_function_prototype_locus;
99 /* Whether this prototype was built-in. */
101 static bool current_function_prototype_built_in;
103 /* The argument type information of this prototype. */
105 static tree current_function_prototype_arg_types;
107 /* The argument information structure for the function currently being
110 static struct c_arg_info *current_function_arg_info;
112 /* The obstack on which parser and related data structures, which are
113 not live beyond their top-level declaration or definition, are
115 struct obstack parser_obstack;
117 /* The current statement tree. */
119 static GTY(()) struct stmt_tree_s c_stmt_tree;
121 /* State saving variables. */
125 /* A list of decls to be made automatically visible in each file scope. */
126 static GTY(()) tree visible_builtins;
128 /* Set to 0 at beginning of a function definition, set to 1 if
129 a return statement that specifies a return value is seen. */
131 int current_function_returns_value;
133 /* Set to 0 at beginning of a function definition, set to 1 if
134 a return statement with no argument is seen. */
136 int current_function_returns_null;
138 /* Set to 0 at beginning of a function definition, set to 1 if
139 a call to a noreturn function is seen. */
141 int current_function_returns_abnormally;
143 /* Set to nonzero by `grokdeclarator' for a function
144 whose return type is defaulted, if warnings for this are desired. */
146 static int warn_about_return_type;
148 /* Nonzero when the current toplevel function contains a declaration
149 of a nested function which is never defined. */
151 static bool undef_nested_function;
153 /* Mode used to build pointers (VOIDmode means ptr_mode). */
155 enum machine_mode c_default_pointer_mode = VOIDmode;
157 /* If non-zero, implicit "omp declare target" attribute is added into the
159 int current_omp_declare_target_attribute;
161 /* Each c_binding structure describes one binding of an identifier to
162 a decl. All the decls in a scope - irrespective of namespace - are
163 chained together by the ->prev field, which (as the name implies)
164 runs in reverse order. All the decls in a given namespace bound to
165 a given identifier are chained by the ->shadowed field, which runs
166 from inner to outer scopes.
168 The ->decl field usually points to a DECL node, but there are two
169 exceptions. In the namespace of type tags, the bound entity is a
170 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
171 identifier is encountered, it is bound to error_mark_node to
172 suppress further errors about that identifier in the current
175 The ->u.type field stores the type of the declaration in this scope;
176 if NULL, the type is the type of the ->decl field. This is only of
177 relevance for objects with external or internal linkage which may
178 be redeclared in inner scopes, forming composite types that only
179 persist for the duration of those scopes. In the external scope,
180 this stores the composite of all the types declared for this
181 object, visible or not. The ->inner_comp field (used only at file
182 scope) stores whether an incomplete array type at file scope was
183 completed at an inner scope to an array size other than 1.
185 The ->u.label field is used for labels. It points to a structure
186 which stores additional information used for warnings.
188 The depth field is copied from the scope structure that holds this
189 decl. It is used to preserve the proper ordering of the ->shadowed
190 field (see bind()) and also for a handful of special-case checks.
191 Finally, the invisible bit is true for a decl which should be
192 ignored for purposes of normal name lookup, and the nested bit is
193 true for a decl that's been bound a second time in an inner scope;
194 in all such cases, the binding in the outer scope will have its
195 invisible bit true. */
197 struct GTY((chain_next ("%h.prev"))) c_binding {
198 union GTY(()) { /* first so GTY desc can use decl */
199 tree GTY((tag ("0"))) type; /* the type in this scope */
200 struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */
201 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u;
202 tree decl; /* the decl bound */
203 tree id; /* the identifier it's bound to */
204 struct c_binding *prev; /* the previous decl in this scope */
205 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
206 unsigned int depth : 28; /* depth of this scope */
207 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
208 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
209 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
210 BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */
211 location_t locus; /* location for nested bindings */
213 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
214 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
215 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
216 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
218 #define I_SYMBOL_BINDING(node) \
219 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
220 #define I_SYMBOL_DECL(node) \
221 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
223 #define I_TAG_BINDING(node) \
224 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
225 #define I_TAG_DECL(node) \
226 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
228 #define I_LABEL_BINDING(node) \
229 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
230 #define I_LABEL_DECL(node) \
231 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
233 /* Each C symbol points to three linked lists of c_binding structures.
234 These describe the values of the identifier in the three different
235 namespaces defined by the language. */
237 struct GTY(()) lang_identifier {
238 struct c_common_identifier common_id;
239 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
240 struct c_binding *tag_binding; /* struct/union/enum tags */
241 struct c_binding *label_binding; /* labels */
244 /* Validate c-lang.c's assumptions. */
245 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
246 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
248 /* The resulting tree type. */
250 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
251 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
253 union tree_node GTY ((tag ("0"),
254 desc ("tree_node_structure (&%h)")))
256 struct lang_identifier GTY ((tag ("1"))) identifier;
259 /* Track bindings and other things that matter for goto warnings. For
260 efficiency, we do not gather all the decls at the point of
261 definition. Instead, we point into the bindings structure. As
262 scopes are popped, we update these structures and gather the decls
263 that matter at that time. */
265 struct GTY(()) c_spot_bindings {
266 /* The currently open scope which holds bindings defined when the
267 label was defined or the goto statement was found. */
268 struct c_scope *scope;
269 /* The bindings in the scope field which were defined at the point
270 of the label or goto. This lets us look at older or newer
271 bindings in the scope, as appropriate. */
272 struct c_binding *bindings_in_scope;
273 /* The number of statement expressions that have started since this
274 label or goto statement was defined. This is zero if we are at
275 the same statement expression level. It is positive if we are in
276 a statement expression started since this spot. It is negative
277 if this spot was in a statement expression and we have left
280 /* Whether we started in a statement expression but are no longer in
281 it. This is set to true if stmt_exprs ever goes negative. */
285 /* This structure is used to keep track of bindings seen when a goto
286 statement is defined. This is only used if we see the goto
287 statement before we see the label. */
289 struct GTY(()) c_goto_bindings {
290 /* The location of the goto statement. */
292 /* The bindings of the goto statement. */
293 struct c_spot_bindings goto_bindings;
296 typedef struct c_goto_bindings *c_goto_bindings_p;
298 /* The additional information we keep track of for a label binding.
299 These fields are updated as scopes are popped. */
301 struct GTY(()) c_label_vars {
302 /* The shadowed c_label_vars, when one label shadows another (which
303 can only happen using a __label__ declaration). */
304 struct c_label_vars *shadowed;
305 /* The bindings when the label was defined. */
306 struct c_spot_bindings label_bindings;
307 /* A list of decls that we care about: decls about which we should
308 warn if a goto branches to this label from later in the function.
309 Decls are added to this list as scopes are popped. We only add
310 the decls that matter. */
311 vec<tree, va_gc> *decls_in_scope;
312 /* A list of goto statements to this label. This is only used for
313 goto statements seen before the label was defined, so that we can
314 issue appropriate warnings for them. */
315 vec<c_goto_bindings_p, va_gc> *gotos;
318 /* Each c_scope structure describes the complete contents of one
319 scope. Four scopes are distinguished specially: the innermost or
320 current scope, the innermost function scope, the file scope (always
321 the second to outermost) and the outermost or external scope.
323 Most declarations are recorded in the current scope.
325 All normal label declarations are recorded in the innermost
326 function scope, as are bindings of undeclared identifiers to
327 error_mark_node. (GCC permits nested functions as an extension,
328 hence the 'innermost' qualifier.) Explicitly declared labels
329 (using the __label__ extension) appear in the current scope.
331 Being in the file scope (current_scope == file_scope) causes
332 special behavior in several places below. Also, under some
333 conditions the Objective-C front end records declarations in the
334 file scope even though that isn't the current scope.
336 All declarations with external linkage are recorded in the external
337 scope, even if they aren't visible there; this models the fact that
338 such declarations are visible to the entire program, and (with a
339 bit of cleverness, see pushdecl) allows diagnosis of some violations
340 of C99 6.2.2p7 and 6.2.7p2:
342 If, within the same translation unit, the same identifier appears
343 with both internal and external linkage, the behavior is
346 All declarations that refer to the same object or function shall
347 have compatible type; otherwise, the behavior is undefined.
349 Initially only the built-in declarations, which describe compiler
350 intrinsic functions plus a subset of the standard library, are in
353 The order of the blocks list matters, and it is frequently appended
354 to. To avoid having to walk all the way to the end of the list on
355 each insertion, or reverse the list later, we maintain a pointer to
356 the last list entry. (FIXME: It should be feasible to use a reversed
359 The bindings list is strictly in reverse order of declarations;
360 pop_scope relies on this. */
363 struct GTY((chain_next ("%h.outer"))) c_scope {
364 /* The scope containing this one. */
365 struct c_scope *outer;
367 /* The next outermost function scope. */
368 struct c_scope *outer_function;
370 /* All bindings in this scope. */
371 struct c_binding *bindings;
373 /* For each scope (except the global one), a chain of BLOCK nodes
374 for all the scopes that were entered and exited one level down. */
378 /* The depth of this scope. Used to keep the ->shadowed chain of
379 bindings sorted innermost to outermost. */
380 unsigned int depth : 28;
382 /* True if we are currently filling this scope with parameter
384 BOOL_BITFIELD parm_flag : 1;
386 /* True if we saw [*] in this scope. Used to give an error messages
387 if these appears in a function definition. */
388 BOOL_BITFIELD had_vla_unspec : 1;
390 /* True if we already complained about forward parameter decls
391 in this scope. This prevents double warnings on
392 foo (int a; int b; ...) */
393 BOOL_BITFIELD warned_forward_parm_decls : 1;
395 /* True if this is the outermost block scope of a function body.
396 This scope contains the parameters, the local variables declared
397 in the outermost block, and all the labels (except those in
398 nested functions, or declared at block scope with __label__). */
399 BOOL_BITFIELD function_body : 1;
401 /* True means make a BLOCK for this scope no matter what. */
402 BOOL_BITFIELD keep : 1;
404 /* True means that an unsuffixed float constant is _Decimal64. */
405 BOOL_BITFIELD float_const_decimal64 : 1;
407 /* True if this scope has any label bindings. This is used to speed
408 up searching for labels when popping scopes, particularly since
409 labels are normally only found at function scope. */
410 BOOL_BITFIELD has_label_bindings : 1;
412 /* True if we should issue a warning if a goto statement crosses any
413 of the bindings. We still need to check the list of bindings to
414 find the specific ones we need to warn about. This is true if
415 decl_jump_unsafe would return true for any of the bindings. This
416 is used to avoid looping over all the bindings unnecessarily. */
417 BOOL_BITFIELD has_jump_unsafe_decl : 1;
420 /* The scope currently in effect. */
422 static GTY(()) struct c_scope *current_scope;
424 /* The innermost function scope. Ordinary (not explicitly declared)
425 labels, bindings to error_mark_node, and the lazily-created
426 bindings of __func__ and its friends get this scope. */
428 static GTY(()) struct c_scope *current_function_scope;
430 /* The C file scope. This is reset for each input translation unit. */
432 static GTY(()) struct c_scope *file_scope;
434 /* The outermost scope. This is used for all declarations with
435 external linkage, and only these, hence the name. */
437 static GTY(()) struct c_scope *external_scope;
439 /* A chain of c_scope structures awaiting reuse. */
441 static GTY((deletable)) struct c_scope *scope_freelist;
443 /* A chain of c_binding structures awaiting reuse. */
445 static GTY((deletable)) struct c_binding *binding_freelist;
447 /* Append VAR to LIST in scope SCOPE. */
448 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
449 struct c_scope *s_ = (scope); \
451 if (s_->list##_last) \
452 BLOCK_CHAIN (s_->list##_last) = d_; \
455 s_->list##_last = d_; \
458 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
459 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
460 struct c_scope *t_ = (tscope); \
461 struct c_scope *f_ = (fscope); \
463 BLOCK_CHAIN (t_->to##_last) = f_->from; \
466 t_->to##_last = f_->from##_last; \
469 /* A c_inline_static structure stores details of a static identifier
470 referenced in a definition of a function that may be an inline
471 definition if no subsequent declaration of that function uses
472 "extern" or does not use "inline". */
474 struct GTY((chain_next ("%h.next"))) c_inline_static {
475 /* The location for a diagnostic. */
478 /* The function that may be an inline definition. */
481 /* The object or function referenced. */
484 /* What sort of reference this is. */
485 enum c_inline_static_type type;
487 /* The next such structure or NULL. */
488 struct c_inline_static *next;
491 /* List of static identifiers used or referenced in functions that may
492 be inline definitions. */
493 static GTY(()) struct c_inline_static *c_inline_statics;
495 /* True means unconditionally make a BLOCK for the next scope pushed. */
497 static bool keep_next_level_flag;
499 /* True means the next call to push_scope will be the outermost scope
500 of a function body, so do not push a new scope, merely cease
501 expecting parameter decls. */
503 static bool next_is_function_body;
505 /* A vector of pointers to c_binding structures. */
507 typedef struct c_binding *c_binding_ptr;
509 /* Information that we keep for a struct or union while it is being
512 struct c_struct_parse_info
514 /* If warn_cxx_compat, a list of types defined within this
516 vec<tree> struct_types;
517 /* If warn_cxx_compat, a list of field names which have bindings,
518 and which are defined in this struct, but which are not defined
519 in any enclosing struct. This is used to clear the in_struct
520 field of the c_bindings structure. */
521 vec<c_binding_ptr> fields;
522 /* If warn_cxx_compat, a list of typedef names used when defining
523 fields in this struct. */
524 vec<tree> typedefs_seen;
527 /* Information for the struct or union currently being parsed, or
528 NULL if not parsing a struct or union. */
529 static struct c_struct_parse_info *struct_parse_info;
531 /* Forward declarations. */
532 static tree lookup_name_in_scope (tree, struct c_scope *);
533 static tree c_make_fname_decl (location_t, tree, int);
534 static tree grokdeclarator (const struct c_declarator *,
535 struct c_declspecs *,
536 enum decl_context, bool, tree *, tree *, tree *,
537 bool *, enum deprecated_states);
538 static tree grokparms (struct c_arg_info *, bool);
539 static void layout_array_type (tree);
541 /* T is a statement. Add it to the statement-tree. This is the
542 C/ObjC version--C++ has a slightly different version of this
548 enum tree_code code = TREE_CODE (t);
550 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
552 if (!EXPR_HAS_LOCATION (t))
553 SET_EXPR_LOCATION (t, input_location);
556 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
557 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
559 /* Add T to the statement-tree. Non-side-effect statements need to be
560 recorded during statement expressions. */
561 if (!building_stmt_list_p ())
563 append_to_statement_list_force (t, &cur_stmt_list);
568 /* Build a pointer type using the default pointer mode. */
571 c_build_pointer_type (tree to_type)
573 addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC
574 : TYPE_ADDR_SPACE (to_type);
575 enum machine_mode pointer_mode;
577 if (as != ADDR_SPACE_GENERIC || c_default_pointer_mode == VOIDmode)
578 pointer_mode = targetm.addr_space.pointer_mode (as);
580 pointer_mode = c_default_pointer_mode;
581 return build_pointer_type_for_mode (to_type, pointer_mode, false);
585 /* Return true if we will want to say something if a goto statement
589 decl_jump_unsafe (tree decl)
591 if (error_operand_p (decl))
594 /* Always warn about crossing variably modified types. */
595 if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == TYPE_DECL)
596 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
599 /* Otherwise, only warn if -Wgoto-misses-init and this is an
600 initialized automatic decl. */
601 if (warn_jump_misses_init
602 && TREE_CODE (decl) == VAR_DECL
603 && !TREE_STATIC (decl)
604 && DECL_INITIAL (decl) != NULL_TREE)
612 c_print_identifier (FILE *file, tree node, int indent)
614 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
615 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
616 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
617 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
619 tree rid = ridpointers[C_RID_CODE (node)];
620 indent_to (file, indent + 4);
621 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
622 (void *) rid, IDENTIFIER_POINTER (rid));
626 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
627 which may be any of several kinds of DECL or TYPE or error_mark_node,
628 in the scope SCOPE. */
630 bind (tree name, tree decl, struct c_scope *scope, bool invisible,
631 bool nested, location_t locus)
633 struct c_binding *b, **here;
635 if (binding_freelist)
637 b = binding_freelist;
638 binding_freelist = b->prev;
641 b = ggc_alloc<c_binding> ();
646 b->depth = scope->depth;
647 b->invisible = invisible;
655 b->prev = scope->bindings;
658 if (decl_jump_unsafe (decl))
659 scope->has_jump_unsafe_decl = 1;
664 switch (TREE_CODE (decl))
666 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
669 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
675 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
681 /* Locate the appropriate place in the chain of shadowed decls
682 to insert this binding. Normally, scope == current_scope and
683 this does nothing. */
684 while (*here && (*here)->depth > scope->depth)
685 here = &(*here)->shadowed;
691 /* Clear the binding structure B, stick it on the binding_freelist,
692 and return the former value of b->prev. This is used by pop_scope
693 and get_parm_info to iterate destructively over all the bindings
694 from a given scope. */
695 static struct c_binding *
696 free_binding_and_advance (struct c_binding *b)
698 struct c_binding *prev = b->prev;
700 memset (b, 0, sizeof (struct c_binding));
701 b->prev = binding_freelist;
702 binding_freelist = b;
707 /* Bind a label. Like bind, but skip fields which aren't used for
708 labels, and add the LABEL_VARS value. */
710 bind_label (tree name, tree label, struct c_scope *scope,
711 struct c_label_vars *label_vars)
715 bind (name, label, scope, /*invisible=*/false, /*nested=*/false,
718 scope->has_label_bindings = true;
721 gcc_assert (b->decl == label);
722 label_vars->shadowed = b->u.label;
723 b->u.label = label_vars;
726 /* Hook called at end of compilation to assume 1 elt
727 for a file-scope tentative array defn that wasn't complete before. */
730 c_finish_incomplete_decl (tree decl)
732 if (TREE_CODE (decl) == VAR_DECL)
734 tree type = TREE_TYPE (decl);
735 if (type != error_mark_node
736 && TREE_CODE (type) == ARRAY_TYPE
737 && !DECL_EXTERNAL (decl)
738 && TYPE_DOMAIN (type) == 0)
740 warning_at (DECL_SOURCE_LOCATION (decl),
741 0, "array %q+D assumed to have one element", decl);
743 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
745 relayout_decl (decl);
750 /* Record that inline function FUNC contains a reference (location
751 LOC) to static DECL (file-scope or function-local according to
755 record_inline_static (location_t loc, tree func, tree decl,
756 enum c_inline_static_type type)
758 c_inline_static *csi = ggc_alloc<c_inline_static> ();
760 csi->function = func;
761 csi->static_decl = decl;
763 csi->next = c_inline_statics;
764 c_inline_statics = csi;
767 /* Check for references to static declarations in inline functions at
768 the end of the translation unit and diagnose them if the functions
769 are still inline definitions. */
772 check_inline_statics (void)
774 struct c_inline_static *csi;
775 for (csi = c_inline_statics; csi; csi = csi->next)
777 if (DECL_EXTERNAL (csi->function))
781 pedwarn (csi->location, 0,
782 "%qD is static but used in inline function %qD "
783 "which is not static", csi->static_decl, csi->function);
786 pedwarn (csi->location, 0,
787 "%q+D is static but declared in inline function %qD "
788 "which is not static", csi->static_decl, csi->function);
794 c_inline_statics = NULL;
797 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
798 for the current state, otherwise set it to uninitialized. */
801 set_spot_bindings (struct c_spot_bindings *p, bool defining)
805 p->scope = current_scope;
806 p->bindings_in_scope = current_scope->bindings;
811 p->bindings_in_scope = NULL;
814 p->left_stmt_expr = false;
817 /* Update spot bindings P as we pop out of SCOPE. Return true if we
818 should push decls for a label. */
821 update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p)
823 if (p->scope != scope)
825 /* This label or goto is defined in some other scope, or it is a
826 label which is not yet defined. There is nothing to
831 /* Adjust the spot bindings to refer to the bindings already defined
832 in the enclosing scope. */
833 p->scope = scope->outer;
834 p->bindings_in_scope = p->scope->bindings;
839 /* The Objective-C front-end often needs to determine the current scope. */
842 objc_get_current_scope (void)
844 return current_scope;
847 /* The following function is used only by Objective-C. It needs to live here
848 because it accesses the innards of c_scope. */
851 objc_mark_locals_volatile (void *enclosing_blk)
853 struct c_scope *scope;
856 for (scope = current_scope;
857 scope && scope != enclosing_blk;
858 scope = scope->outer)
860 for (b = scope->bindings; b; b = b->prev)
861 objc_volatilize_decl (b->decl);
863 /* Do not climb up past the current function. */
864 if (scope->function_body)
869 /* Return true if we are in the global binding level. */
872 global_bindings_p (void)
874 return current_scope == file_scope;
878 keep_next_level (void)
880 keep_next_level_flag = true;
883 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
886 set_float_const_decimal64 (void)
888 current_scope->float_const_decimal64 = true;
891 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
894 clear_float_const_decimal64 (void)
896 current_scope->float_const_decimal64 = false;
899 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
902 float_const_decimal64_p (void)
904 return current_scope->float_const_decimal64;
907 /* Identify this scope as currently being filled with parameters. */
910 declare_parm_level (void)
912 current_scope->parm_flag = true;
918 if (next_is_function_body)
920 /* This is the transition from the parameters to the top level
921 of the function body. These are the same scope
922 (C99 6.2.1p4,6) so we do not push another scope structure.
923 next_is_function_body is set only by store_parm_decls, which
924 in turn is called when and only when we are about to
925 encounter the opening curly brace for the function body.
927 The outermost block of a function always gets a BLOCK node,
928 because the debugging output routines expect that each
929 function has at least one BLOCK. */
930 current_scope->parm_flag = false;
931 current_scope->function_body = true;
932 current_scope->keep = true;
933 current_scope->outer_function = current_function_scope;
934 current_function_scope = current_scope;
936 keep_next_level_flag = false;
937 next_is_function_body = false;
939 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
940 if (current_scope->outer)
941 current_scope->float_const_decimal64
942 = current_scope->outer->float_const_decimal64;
944 current_scope->float_const_decimal64 = false;
948 struct c_scope *scope;
951 scope = scope_freelist;
952 scope_freelist = scope->outer;
955 scope = ggc_cleared_alloc<c_scope> ();
957 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
959 scope->float_const_decimal64 = current_scope->float_const_decimal64;
961 scope->float_const_decimal64 = false;
963 scope->keep = keep_next_level_flag;
964 scope->outer = current_scope;
965 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
967 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
969 if (current_scope && scope->depth == 0)
972 sorry ("GCC supports only %u nested scopes", scope->depth);
975 current_scope = scope;
976 keep_next_level_flag = false;
980 /* This is called when we are leaving SCOPE. For each label defined
981 in SCOPE, add any appropriate decls to its decls_in_scope fields.
982 These are the decls whose initialization will be skipped by a goto
983 later in the function. */
986 update_label_decls (struct c_scope *scope)
993 if (s->has_label_bindings)
997 for (b = s->bindings; b != NULL; b = b->prev)
999 struct c_label_vars *label_vars;
1000 struct c_binding *b1;
1003 struct c_goto_bindings *g;
1005 if (TREE_CODE (b->decl) != LABEL_DECL)
1007 label_vars = b->u.label;
1009 b1 = label_vars->label_bindings.bindings_in_scope;
1010 if (label_vars->label_bindings.scope == NULL)
1013 hjud = label_vars->label_bindings.scope->has_jump_unsafe_decl;
1014 if (update_spot_bindings (scope, &label_vars->label_bindings))
1016 /* This label is defined in this scope. */
1019 for (; b1 != NULL; b1 = b1->prev)
1021 /* A goto from later in the function to this
1022 label will never see the initialization
1023 of B1, if any. Save it to issue a
1024 warning if needed. */
1025 if (decl_jump_unsafe (b1->decl))
1026 vec_safe_push(label_vars->decls_in_scope, b1->decl);
1031 /* Update the bindings of any goto statements associated
1033 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1034 update_spot_bindings (scope, &g->goto_bindings);
1038 /* Don't search beyond the current function. */
1039 if (s == current_function_scope)
1046 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1049 set_type_context (tree type, tree context)
1051 for (type = TYPE_MAIN_VARIANT (type); type;
1052 type = TYPE_NEXT_VARIANT (type))
1053 TYPE_CONTEXT (type) = context;
1056 /* Exit a scope. Restore the state of the identifier-decl mappings
1057 that were in effect when this scope was entered. Return a BLOCK
1058 node containing all the DECLs in this scope that are of interest
1059 to debug info generation. */
1064 struct c_scope *scope = current_scope;
1065 tree block, context, p;
1066 struct c_binding *b;
1068 bool functionbody = scope->function_body;
1069 bool keep = functionbody || scope->keep || scope->bindings;
1071 update_label_decls (scope);
1073 /* If appropriate, create a BLOCK to record the decls for the life
1074 of this function. */
1078 block = make_node (BLOCK);
1079 BLOCK_SUBBLOCKS (block) = scope->blocks;
1080 TREE_USED (block) = 1;
1082 /* In each subblock, record that this is its superior. */
1083 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
1084 BLOCK_SUPERCONTEXT (p) = block;
1086 BLOCK_VARS (block) = 0;
1089 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1090 scope must be set so that they point to the appropriate
1091 construct, i.e. either to the current FUNCTION_DECL node, or
1092 else to the BLOCK node we just constructed.
1094 Note that for tagged types whose scope is just the formal
1095 parameter list for some function type specification, we can't
1096 properly set their TYPE_CONTEXTs here, because we don't have a
1097 pointer to the appropriate FUNCTION_TYPE node readily available
1098 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1099 type nodes get set in `grokdeclarator' as soon as we have created
1100 the FUNCTION_TYPE node which will represent the "scope" for these
1101 "parameter list local" tagged types. */
1102 if (scope->function_body)
1103 context = current_function_decl;
1104 else if (scope == file_scope)
1106 tree file_decl = build_translation_unit_decl (NULL_TREE);
1107 context = file_decl;
1112 /* Clear all bindings in this scope. */
1113 for (b = scope->bindings; b; b = free_binding_and_advance (b))
1116 switch (TREE_CODE (p))
1119 /* Warnings for unused labels, errors for undefined labels. */
1120 if (TREE_USED (p) && !DECL_INITIAL (p))
1122 error ("label %q+D used but not defined", p);
1123 DECL_INITIAL (p) = error_mark_node;
1126 warn_for_unused_label (p);
1128 /* Labels go in BLOCK_VARS. */
1129 DECL_CHAIN (p) = BLOCK_VARS (block);
1130 BLOCK_VARS (block) = p;
1131 gcc_assert (I_LABEL_BINDING (b->id) == b);
1132 I_LABEL_BINDING (b->id) = b->shadowed;
1134 /* Also pop back to the shadowed label_vars. */
1135 release_tree_vector (b->u.label->decls_in_scope);
1136 b->u.label = b->u.label->shadowed;
1142 set_type_context (p, context);
1144 /* Types may not have tag-names, in which case the type
1145 appears in the bindings list with b->id NULL. */
1148 gcc_assert (I_TAG_BINDING (b->id) == b);
1149 I_TAG_BINDING (b->id) = b->shadowed;
1154 /* Propagate TREE_ADDRESSABLE from nested functions to their
1155 containing functions. */
1156 if (!TREE_ASM_WRITTEN (p)
1157 && DECL_INITIAL (p) != 0
1158 && TREE_ADDRESSABLE (p)
1159 && DECL_ABSTRACT_ORIGIN (p) != 0
1160 && DECL_ABSTRACT_ORIGIN (p) != p)
1161 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
1162 if (!DECL_EXTERNAL (p)
1163 && !DECL_INITIAL (p)
1164 && scope != file_scope
1165 && scope != external_scope)
1167 error ("nested function %q+D declared but never defined", p);
1168 undef_nested_function = true;
1170 else if (DECL_DECLARED_INLINE_P (p)
1172 && !DECL_INITIAL (p))
1174 /* C99 6.7.4p6: "a function with external linkage... declared
1175 with an inline function specifier ... shall also be defined
1176 in the same translation unit." */
1177 if (!flag_gnu89_inline)
1178 pedwarn (input_location, 0,
1179 "inline function %q+D declared but never defined", p);
1180 DECL_EXTERNAL (p) = 1;
1186 /* Warnings for unused variables. */
1187 if ((!TREE_USED (p) || !DECL_READ_P (p))
1188 && !TREE_NO_WARNING (p)
1189 && !DECL_IN_SYSTEM_HEADER (p)
1191 && !DECL_ARTIFICIAL (p)
1192 && scope != file_scope
1193 && scope != external_scope)
1196 warning (OPT_Wunused_variable, "unused variable %q+D", p);
1197 else if (DECL_CONTEXT (p) == current_function_decl)
1198 warning_at (DECL_SOURCE_LOCATION (p),
1199 OPT_Wunused_but_set_variable,
1200 "variable %qD set but not used", p);
1205 error ("type of array %q+D completed incompatibly with"
1206 " implicit initialization", p);
1213 /* All of these go in BLOCK_VARS, but only if this is the
1214 binding in the home scope. */
1217 DECL_CHAIN (p) = BLOCK_VARS (block);
1218 BLOCK_VARS (block) = p;
1220 else if (VAR_OR_FUNCTION_DECL_P (p) && scope != file_scope)
1222 /* For block local externs add a special
1223 DECL_EXTERNAL decl for debug info generation. */
1224 tree extp = copy_node (p);
1226 DECL_EXTERNAL (extp) = 1;
1227 TREE_STATIC (extp) = 0;
1228 TREE_PUBLIC (extp) = 1;
1229 DECL_INITIAL (extp) = NULL_TREE;
1230 DECL_LANG_SPECIFIC (extp) = NULL;
1231 DECL_CONTEXT (extp) = current_function_decl;
1232 if (TREE_CODE (p) == FUNCTION_DECL)
1234 DECL_RESULT (extp) = NULL_TREE;
1235 DECL_SAVED_TREE (extp) = NULL_TREE;
1236 DECL_STRUCT_FUNCTION (extp) = NULL;
1238 if (b->locus != UNKNOWN_LOCATION)
1239 DECL_SOURCE_LOCATION (extp) = b->locus;
1240 DECL_CHAIN (extp) = BLOCK_VARS (block);
1241 BLOCK_VARS (block) = extp;
1243 /* If this is the file scope set DECL_CONTEXT of each decl to
1244 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1246 if (scope == file_scope)
1248 DECL_CONTEXT (p) = context;
1249 if (TREE_CODE (p) == TYPE_DECL
1250 && TREE_TYPE (p) != error_mark_node)
1251 set_type_context (TREE_TYPE (p), context);
1255 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1256 already been put there by store_parm_decls. Unused-
1257 parameter warnings are handled by function.c.
1258 error_mark_node obviously does not go in BLOCK_VARS and
1259 does not get unused-variable warnings. */
1262 /* It is possible for a decl not to have a name. We get
1263 here with b->id NULL in this case. */
1266 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
1267 I_SYMBOL_BINDING (b->id) = b->shadowed;
1268 if (b->shadowed && b->shadowed->u.type)
1269 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
1279 /* Dispose of the block that we just made inside some higher level. */
1280 if ((scope->function_body || scope == file_scope) && context)
1282 DECL_INITIAL (context) = block;
1283 BLOCK_SUPERCONTEXT (block) = context;
1285 else if (scope->outer)
1288 SCOPE_LIST_APPEND (scope->outer, blocks, block);
1289 /* If we did not make a block for the scope just exited, any
1290 blocks made for inner scopes must be carried forward so they
1291 will later become subblocks of something else. */
1292 else if (scope->blocks)
1293 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
1296 /* Pop the current scope, and free the structure for reuse. */
1297 current_scope = scope->outer;
1298 if (scope->function_body)
1299 current_function_scope = scope->outer_function;
1301 memset (scope, 0, sizeof (struct c_scope));
1302 scope->outer = scope_freelist;
1303 scope_freelist = scope;
1309 push_file_scope (void)
1317 file_scope = current_scope;
1319 start_fname_decls ();
1321 for (decl = visible_builtins; decl; decl = DECL_CHAIN (decl))
1322 bind (DECL_NAME (decl), decl, file_scope,
1323 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl));
1327 pop_file_scope (void)
1329 /* In case there were missing closebraces, get us back to the global
1331 while (current_scope != file_scope)
1334 /* __FUNCTION__ is defined at file scope (""). This
1335 call may not be necessary as my tests indicate it
1336 still works without it. */
1337 finish_fname_decls ();
1339 check_inline_statics ();
1341 /* This is the point to write out a PCH if we're doing that.
1342 In that case we do not want to do anything else. */
1345 c_common_write_pch ();
1349 /* Pop off the file scope and close this translation unit. */
1353 maybe_apply_pending_pragma_weaks ();
1356 /* Adjust the bindings for the start of a statement expression. */
1359 c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings)
1361 struct c_scope *scope;
1363 for (scope = current_scope; scope != NULL; scope = scope->outer)
1365 struct c_binding *b;
1367 if (!scope->has_label_bindings)
1370 for (b = scope->bindings; b != NULL; b = b->prev)
1372 struct c_label_vars *label_vars;
1374 struct c_goto_bindings *g;
1376 if (TREE_CODE (b->decl) != LABEL_DECL)
1378 label_vars = b->u.label;
1379 ++label_vars->label_bindings.stmt_exprs;
1380 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1381 ++g->goto_bindings.stmt_exprs;
1385 if (switch_bindings != NULL)
1386 ++switch_bindings->stmt_exprs;
1389 /* Adjust the bindings for the end of a statement expression. */
1392 c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings)
1394 struct c_scope *scope;
1396 for (scope = current_scope; scope != NULL; scope = scope->outer)
1398 struct c_binding *b;
1400 if (!scope->has_label_bindings)
1403 for (b = scope->bindings; b != NULL; b = b->prev)
1405 struct c_label_vars *label_vars;
1407 struct c_goto_bindings *g;
1409 if (TREE_CODE (b->decl) != LABEL_DECL)
1411 label_vars = b->u.label;
1412 --label_vars->label_bindings.stmt_exprs;
1413 if (label_vars->label_bindings.stmt_exprs < 0)
1415 label_vars->label_bindings.left_stmt_expr = true;
1416 label_vars->label_bindings.stmt_exprs = 0;
1418 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1420 --g->goto_bindings.stmt_exprs;
1421 if (g->goto_bindings.stmt_exprs < 0)
1423 g->goto_bindings.left_stmt_expr = true;
1424 g->goto_bindings.stmt_exprs = 0;
1430 if (switch_bindings != NULL)
1432 --switch_bindings->stmt_exprs;
1433 gcc_assert (switch_bindings->stmt_exprs >= 0);
1437 /* Push a definition or a declaration of struct, union or enum tag "name".
1438 "type" should be the type node.
1439 We assume that the tag "name" is not already defined, and has a location
1442 Note that the definition may really be just a forward reference.
1443 In that case, the TYPE_SIZE will be zero. */
1446 pushtag (location_t loc, tree name, tree type)
1448 /* Record the identifier as the type's name if it has none. */
1449 if (name && !TYPE_NAME (type))
1450 TYPE_NAME (type) = name;
1451 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc);
1453 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1454 tagged type we just added to the current scope. This fake
1455 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1456 to output a representation of a tagged type, and it also gives
1457 us a convenient place to record the "scope start" address for the
1460 TYPE_STUB_DECL (type) = pushdecl (build_decl (loc,
1461 TYPE_DECL, NULL_TREE, type));
1463 /* An approximation for now, so we can tell this is a function-scope tag.
1464 This will be updated in pop_scope. */
1465 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1467 if (warn_cxx_compat && name != NULL_TREE)
1469 struct c_binding *b = I_SYMBOL_BINDING (name);
1472 && b->decl != NULL_TREE
1473 && TREE_CODE (b->decl) == TYPE_DECL
1474 && (B_IN_CURRENT_SCOPE (b)
1475 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
1476 && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl))
1477 != TYPE_MAIN_VARIANT (type)))
1479 warning_at (loc, OPT_Wc___compat,
1480 ("using %qD as both a typedef and a tag is "
1483 if (b->locus != UNKNOWN_LOCATION)
1484 inform (b->locus, "originally defined here");
1489 /* Subroutine of compare_decls. Allow harmless mismatches in return
1490 and argument types provided that the type modes match. This function
1491 return a unified type given a suitable match, and 0 otherwise. */
1494 match_builtin_function_types (tree newtype, tree oldtype)
1496 tree newrettype, oldrettype;
1497 tree newargs, oldargs;
1498 tree trytype, tryargs;
1500 /* Accept the return type of the new declaration if same modes. */
1501 oldrettype = TREE_TYPE (oldtype);
1502 newrettype = TREE_TYPE (newtype);
1504 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1507 oldargs = TYPE_ARG_TYPES (oldtype);
1508 newargs = TYPE_ARG_TYPES (newtype);
1511 while (oldargs || newargs)
1515 || !TREE_VALUE (oldargs)
1516 || !TREE_VALUE (newargs)
1517 || TYPE_MODE (TREE_VALUE (oldargs))
1518 != TYPE_MODE (TREE_VALUE (newargs)))
1521 oldargs = TREE_CHAIN (oldargs);
1522 newargs = TREE_CHAIN (newargs);
1525 trytype = build_function_type (newrettype, tryargs);
1526 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1529 /* Subroutine of diagnose_mismatched_decls. Check for function type
1530 mismatch involving an empty arglist vs a nonempty one and give clearer
1533 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1534 tree newtype, tree oldtype)
1538 if (TREE_CODE (olddecl) != FUNCTION_DECL
1539 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1540 || !((!prototype_p (oldtype) && DECL_INITIAL (olddecl) == 0)
1541 || (!prototype_p (newtype) && DECL_INITIAL (newdecl) == 0)))
1544 t = TYPE_ARG_TYPES (oldtype);
1546 t = TYPE_ARG_TYPES (newtype);
1547 for (; t; t = TREE_CHAIN (t))
1549 tree type = TREE_VALUE (t);
1551 if (TREE_CHAIN (t) == 0
1552 && TYPE_MAIN_VARIANT (type) != void_type_node)
1554 inform (input_location, "a parameter list with an ellipsis can%'t match "
1555 "an empty parameter name list declaration");
1559 if (c_type_promotes_to (type) != type)
1561 inform (input_location, "an argument type that has a default promotion can%'t match "
1562 "an empty parameter name list declaration");
1568 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1569 old-style function definition, NEWDECL is a prototype declaration.
1570 Diagnose inconsistencies in the argument list. Returns TRUE if
1571 the prototype is compatible, FALSE if not. */
1573 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1575 tree newargs, oldargs;
1578 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1580 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1581 newargs = TYPE_ARG_TYPES (newtype);
1586 tree oldargtype = TREE_VALUE (oldargs);
1587 tree newargtype = TREE_VALUE (newargs);
1589 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1592 oldargtype = (TYPE_ATOMIC (oldargtype)
1593 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype),
1595 : TYPE_MAIN_VARIANT (oldargtype));
1596 newargtype = (TYPE_ATOMIC (newargtype)
1597 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype),
1599 : TYPE_MAIN_VARIANT (newargtype));
1601 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1604 /* Reaching the end of just one list means the two decls don't
1605 agree on the number of arguments. */
1606 if (END_OF_ARGLIST (oldargtype))
1608 error ("prototype for %q+D declares more arguments "
1609 "than previous old-style definition", newdecl);
1612 else if (END_OF_ARGLIST (newargtype))
1614 error ("prototype for %q+D declares fewer arguments "
1615 "than previous old-style definition", newdecl);
1619 /* Type for passing arg must be consistent with that declared
1621 else if (!comptypes (oldargtype, newargtype))
1623 error ("prototype for %q+D declares argument %d"
1624 " with incompatible type",
1629 oldargs = TREE_CHAIN (oldargs);
1630 newargs = TREE_CHAIN (newargs);
1634 /* If we get here, no errors were found, but do issue a warning
1635 for this poor-style construct. */
1636 warning (0, "prototype for %q+D follows non-prototype definition",
1639 #undef END_OF_ARGLIST
1642 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1643 first in a pair of mismatched declarations, using the diagnostic
1646 locate_old_decl (tree decl)
1648 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)
1649 && !C_DECL_DECLARED_BUILTIN (decl))
1651 else if (DECL_INITIAL (decl))
1652 inform (input_location, "previous definition of %q+D was here", decl);
1653 else if (C_DECL_IMPLICIT (decl))
1654 inform (input_location, "previous implicit declaration of %q+D was here", decl);
1656 inform (input_location, "previous declaration of %q+D was here", decl);
1659 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1660 Returns true if the caller should proceed to merge the two, false
1661 if OLDDECL should simply be discarded. As a side effect, issues
1662 all necessary diagnostics for invalid or poor-style combinations.
1663 If it returns true, writes the types of NEWDECL and OLDDECL to
1664 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1665 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1668 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1669 tree *newtypep, tree *oldtypep)
1671 tree newtype, oldtype;
1672 bool pedwarned = false;
1673 bool warned = false;
1676 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1677 && DECL_EXTERNAL (DECL))
1679 /* If we have error_mark_node for either decl or type, just discard
1680 the previous decl - we're in an error cascade already. */
1681 if (olddecl == error_mark_node || newdecl == error_mark_node)
1683 *oldtypep = oldtype = TREE_TYPE (olddecl);
1684 *newtypep = newtype = TREE_TYPE (newdecl);
1685 if (oldtype == error_mark_node || newtype == error_mark_node)
1688 /* Two different categories of symbol altogether. This is an error
1689 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1690 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1692 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1693 && DECL_BUILT_IN (olddecl)
1694 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1696 error ("%q+D redeclared as different kind of symbol", newdecl);
1697 locate_old_decl (olddecl);
1699 else if (TREE_PUBLIC (newdecl))
1700 warning (0, "built-in function %q+D declared as non-function",
1703 warning (OPT_Wshadow, "declaration of %q+D shadows "
1704 "a built-in function", newdecl);
1708 /* Enumerators have no linkage, so may only be declared once in a
1710 if (TREE_CODE (olddecl) == CONST_DECL)
1712 error ("redeclaration of enumerator %q+D", newdecl);
1713 locate_old_decl (olddecl);
1717 if (!comptypes (oldtype, newtype))
1719 if (TREE_CODE (olddecl) == FUNCTION_DECL
1720 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1722 /* Accept harmless mismatch in function types.
1723 This is for the ffs and fprintf builtins. */
1724 tree trytype = match_builtin_function_types (newtype, oldtype);
1726 if (trytype && comptypes (newtype, trytype))
1727 *oldtypep = oldtype = trytype;
1730 /* If types don't match for a built-in, throw away the
1731 built-in. No point in calling locate_old_decl here, it
1732 won't print anything. */
1733 warning (0, "conflicting types for built-in function %q+D",
1738 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1739 && DECL_IS_BUILTIN (olddecl))
1741 /* A conflicting function declaration for a predeclared
1742 function that isn't actually built in. Objective C uses
1743 these. The new declaration silently overrides everything
1744 but the volatility (i.e. noreturn) indication. See also
1745 below. FIXME: Make Objective C use normal builtins. */
1746 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1749 /* Permit void foo (...) to match int foo (...) if the latter is
1750 the definition and implicit int was used. See
1751 c-torture/compile/920625-2.c. */
1752 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1753 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1754 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1755 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1757 pedwarned = pedwarn (input_location, 0,
1758 "conflicting types for %q+D", newdecl);
1759 /* Make sure we keep void as the return type. */
1760 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1761 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1763 /* Permit void foo (...) to match an earlier call to foo (...) with
1764 no declared type (thus, implicitly int). */
1765 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1766 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1767 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1768 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1770 pedwarned = pedwarn (input_location, 0,
1771 "conflicting types for %q+D", newdecl);
1772 /* Make sure we keep void as the return type. */
1773 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1777 int new_quals = TYPE_QUALS (newtype);
1778 int old_quals = TYPE_QUALS (oldtype);
1780 if (new_quals != old_quals)
1782 addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals);
1783 addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals);
1784 if (new_addr != old_addr)
1786 if (ADDR_SPACE_GENERIC_P (new_addr))
1787 error ("conflicting named address spaces (generic vs %s) "
1789 c_addr_space_name (old_addr), newdecl);
1790 else if (ADDR_SPACE_GENERIC_P (old_addr))
1791 error ("conflicting named address spaces (%s vs generic) "
1793 c_addr_space_name (new_addr), newdecl);
1795 error ("conflicting named address spaces (%s vs %s) "
1797 c_addr_space_name (new_addr),
1798 c_addr_space_name (old_addr),
1802 if (CLEAR_QUAL_ADDR_SPACE (new_quals)
1803 != CLEAR_QUAL_ADDR_SPACE (old_quals))
1804 error ("conflicting type qualifiers for %q+D", newdecl);
1807 error ("conflicting types for %q+D", newdecl);
1808 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1809 locate_old_decl (olddecl);
1814 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1815 but silently ignore the redeclaration if either is in a system
1816 header. (Conflicting redeclarations were handled above.) This
1817 is allowed for C11 if the types are the same, not just
1819 if (TREE_CODE (newdecl) == TYPE_DECL)
1821 bool types_different = false;
1822 int comptypes_result;
1825 = comptypes_check_different_types (oldtype, newtype, &types_different);
1827 if (comptypes_result != 1 || types_different)
1829 error ("redefinition of typedef %q+D with different type", newdecl);
1830 locate_old_decl (olddecl);
1834 if (DECL_IN_SYSTEM_HEADER (newdecl)
1835 || DECL_IN_SYSTEM_HEADER (olddecl)
1836 || TREE_NO_WARNING (newdecl)
1837 || TREE_NO_WARNING (olddecl))
1838 return true; /* Allow OLDDECL to continue in use. */
1840 if (variably_modified_type_p (newtype, NULL))
1842 error ("redefinition of typedef %q+D with variably modified type",
1844 locate_old_decl (olddecl);
1846 else if (pedantic && !flag_isoc11)
1848 pedwarn (input_location, OPT_Wpedantic,
1849 "redefinition of typedef %q+D", newdecl);
1850 locate_old_decl (olddecl);
1856 /* Function declarations can either be 'static' or 'extern' (no
1857 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1858 can never conflict with each other on account of linkage
1859 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1860 gnu89 mode permits two definitions if one is 'extern inline' and
1861 one is not. The non- extern-inline definition supersedes the
1862 extern-inline definition. */
1864 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1866 /* If you declare a built-in function name as static, or
1867 define the built-in with an old-style definition (so we
1868 can't validate the argument list) the built-in definition is
1869 overridden, but optionally warn this was a bad choice of name. */
1870 if (DECL_BUILT_IN (olddecl)
1871 && !C_DECL_DECLARED_BUILTIN (olddecl)
1872 && (!TREE_PUBLIC (newdecl)
1873 || (DECL_INITIAL (newdecl)
1874 && !prototype_p (TREE_TYPE (newdecl)))))
1876 warning (OPT_Wshadow, "declaration of %q+D shadows "
1877 "a built-in function", newdecl);
1878 /* Discard the old built-in function. */
1882 if (DECL_INITIAL (newdecl))
1884 if (DECL_INITIAL (olddecl))
1886 /* If both decls are in the same TU and the new declaration
1887 isn't overriding an extern inline reject the new decl.
1888 In c99, no overriding is allowed in the same translation
1890 if ((!DECL_EXTERN_INLINE (olddecl)
1891 || DECL_EXTERN_INLINE (newdecl)
1892 || (!flag_gnu89_inline
1893 && (!DECL_DECLARED_INLINE_P (olddecl)
1894 || !lookup_attribute ("gnu_inline",
1895 DECL_ATTRIBUTES (olddecl)))
1896 && (!DECL_DECLARED_INLINE_P (newdecl)
1897 || !lookup_attribute ("gnu_inline",
1898 DECL_ATTRIBUTES (newdecl))))
1900 && same_translation_unit_p (newdecl, olddecl))
1902 error ("redefinition of %q+D", newdecl);
1903 locate_old_decl (olddecl);
1908 /* If we have a prototype after an old-style function definition,
1909 the argument types must be checked specially. */
1910 else if (DECL_INITIAL (olddecl)
1911 && !prototype_p (oldtype) && prototype_p (newtype)
1912 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1913 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1915 locate_old_decl (olddecl);
1918 /* A non-static declaration (even an "extern") followed by a
1919 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1920 The same is true for a static forward declaration at block
1921 scope followed by a non-static declaration/definition at file
1922 scope. Static followed by non-static at the same scope is
1923 not undefined behavior, and is the most convenient way to get
1924 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1925 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1926 we do diagnose it if -Wtraditional. */
1927 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1929 /* Two exceptions to the rule. If olddecl is an extern
1930 inline, or a predeclared function that isn't actually
1931 built in, newdecl silently overrides olddecl. The latter
1932 occur only in Objective C; see also above. (FIXME: Make
1933 Objective C use normal builtins.) */
1934 if (!DECL_IS_BUILTIN (olddecl)
1935 && !DECL_EXTERN_INLINE (olddecl))
1937 error ("static declaration of %q+D follows "
1938 "non-static declaration", newdecl);
1939 locate_old_decl (olddecl);
1943 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1945 if (DECL_CONTEXT (olddecl))
1947 error ("non-static declaration of %q+D follows "
1948 "static declaration", newdecl);
1949 locate_old_decl (olddecl);
1952 else if (warn_traditional)
1954 warned |= warning (OPT_Wtraditional,
1955 "non-static declaration of %q+D "
1956 "follows static declaration", newdecl);
1960 /* Make sure gnu_inline attribute is either not present, or
1961 present on all inline decls. */
1962 if (DECL_DECLARED_INLINE_P (olddecl)
1963 && DECL_DECLARED_INLINE_P (newdecl))
1965 bool newa = lookup_attribute ("gnu_inline",
1966 DECL_ATTRIBUTES (newdecl)) != NULL;
1967 bool olda = lookup_attribute ("gnu_inline",
1968 DECL_ATTRIBUTES (olddecl)) != NULL;
1971 error_at (input_location, "%<gnu_inline%> attribute present on %q+D",
1972 newa ? newdecl : olddecl);
1973 error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl),
1978 else if (TREE_CODE (newdecl) == VAR_DECL)
1980 /* Only variables can be thread-local, and all declarations must
1981 agree on this property. */
1982 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1984 /* Nothing to check. Since OLDDECL is marked threadprivate
1985 and NEWDECL does not have a thread-local attribute, we
1986 will merge the threadprivate attribute into NEWDECL. */
1989 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1991 if (DECL_THREAD_LOCAL_P (newdecl))
1992 error ("thread-local declaration of %q+D follows "
1993 "non-thread-local declaration", newdecl);
1995 error ("non-thread-local declaration of %q+D follows "
1996 "thread-local declaration", newdecl);
1998 locate_old_decl (olddecl);
2002 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2003 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
2005 error ("redefinition of %q+D", newdecl);
2006 locate_old_decl (olddecl);
2010 /* Objects declared at file scope: if the first declaration had
2011 external linkage (even if it was an external reference) the
2012 second must have external linkage as well, or the behavior is
2013 undefined. If the first declaration had internal linkage, then
2014 the second must too, or else be an external reference (in which
2015 case the composite declaration still has internal linkage).
2016 As for function declarations, we warn about the static-then-
2017 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2018 if (DECL_FILE_SCOPE_P (newdecl)
2019 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
2021 if (DECL_EXTERNAL (newdecl))
2023 if (!DECL_FILE_SCOPE_P (olddecl))
2025 error ("extern declaration of %q+D follows "
2026 "declaration with no linkage", newdecl);
2027 locate_old_decl (olddecl);
2030 else if (warn_traditional)
2032 warned |= warning (OPT_Wtraditional,
2033 "non-static declaration of %q+D "
2034 "follows static declaration", newdecl);
2039 if (TREE_PUBLIC (newdecl))
2040 error ("non-static declaration of %q+D follows "
2041 "static declaration", newdecl);
2043 error ("static declaration of %q+D follows "
2044 "non-static declaration", newdecl);
2046 locate_old_decl (olddecl);
2050 /* Two objects with the same name declared at the same block
2051 scope must both be external references (6.7p3). */
2052 else if (!DECL_FILE_SCOPE_P (newdecl))
2054 if (DECL_EXTERNAL (newdecl))
2056 /* Extern with initializer at block scope, which will
2057 already have received an error. */
2059 else if (DECL_EXTERNAL (olddecl))
2061 error ("declaration of %q+D with no linkage follows "
2062 "extern declaration", newdecl);
2063 locate_old_decl (olddecl);
2067 error ("redeclaration of %q+D with no linkage", newdecl);
2068 locate_old_decl (olddecl);
2074 /* C++ does not permit a decl to appear multiple times at file
2077 && DECL_FILE_SCOPE_P (newdecl)
2078 && !DECL_EXTERNAL (newdecl)
2079 && !DECL_EXTERNAL (olddecl))
2080 warned |= warning_at (DECL_SOURCE_LOCATION (newdecl),
2082 ("duplicate declaration of %qD is "
2088 /* All decls must agree on a visibility. */
2089 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
2090 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
2091 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2093 warned |= warning (0, "redeclaration of %q+D with different visibility "
2094 "(old visibility preserved)", newdecl);
2097 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2099 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2100 if (DECL_DECLARED_INLINE_P (newdecl)
2101 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2102 warned |= warning (OPT_Wattributes,
2103 "inline declaration of %qD follows "
2104 "declaration with attribute noinline", newdecl);
2105 else if (DECL_DECLARED_INLINE_P (olddecl)
2106 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
2107 warned |= warning (OPT_Wattributes,
2108 "declaration of %q+D with attribute "
2109 "noinline follows inline declaration ", newdecl);
2110 else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl))
2111 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl)))
2112 warned |= warning (OPT_Wattributes,
2113 "declaration of %q+D with attribute "
2114 "%qs follows declaration with attribute %qs",
2115 newdecl, "noinline", "always_inline");
2116 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl))
2117 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2118 warned |= warning (OPT_Wattributes,
2119 "declaration of %q+D with attribute "
2120 "%qs follows declaration with attribute %qs",
2121 newdecl, "always_inline", "noinline");
2122 else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl))
2123 && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl)))
2124 warned |= warning (OPT_Wattributes,
2125 "declaration of %q+D with attribute %qs follows "
2126 "declaration with attribute %qs", newdecl, "cold",
2128 else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl))
2129 && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl)))
2130 warned |= warning (OPT_Wattributes,
2131 "declaration of %q+D with attribute %qs follows "
2132 "declaration with attribute %qs", newdecl, "hot",
2135 else /* PARM_DECL, VAR_DECL */
2137 /* Redeclaration of a parameter is a constraint violation (this is
2138 not explicitly stated, but follows from C99 6.7p3 [no more than
2139 one declaration of the same identifier with no linkage in the
2140 same scope, except type tags] and 6.2.2p6 [parameters have no
2141 linkage]). We must check for a forward parameter declaration,
2142 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2143 an extension, the mandatory diagnostic for which is handled by
2144 mark_forward_parm_decls. */
2146 if (TREE_CODE (newdecl) == PARM_DECL
2147 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
2149 error ("redefinition of parameter %q+D", newdecl);
2150 locate_old_decl (olddecl);
2155 /* Optional warning for completely redundant decls. */
2156 if (!warned && !pedwarned
2157 && warn_redundant_decls
2158 /* Don't warn about a function declaration followed by a
2160 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2161 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
2162 /* Don't warn about redundant redeclarations of builtins. */
2163 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2164 && !DECL_BUILT_IN (newdecl)
2165 && DECL_BUILT_IN (olddecl)
2166 && !C_DECL_DECLARED_BUILTIN (olddecl))
2167 /* Don't warn about an extern followed by a definition. */
2168 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
2169 /* Don't warn about forward parameter decls. */
2170 && !(TREE_CODE (newdecl) == PARM_DECL
2171 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2172 /* Don't warn about a variable definition following a declaration. */
2173 && !(TREE_CODE (newdecl) == VAR_DECL
2174 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
2176 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
2180 /* Report location of previous decl/defn. */
2181 if (warned || pedwarned)
2182 locate_old_decl (olddecl);
2184 #undef DECL_EXTERN_INLINE
2189 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2190 consistent with OLDDECL, but carries new information. Merge the
2191 new information into OLDDECL. This function issues no
2195 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
2197 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
2198 && DECL_INITIAL (newdecl) != 0);
2199 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
2200 && prototype_p (TREE_TYPE (newdecl)));
2201 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
2202 && prototype_p (TREE_TYPE (olddecl)));
2204 /* For real parm decl following a forward decl, rechain the old decl
2205 in its new location and clear TREE_ASM_WRITTEN (it's not a
2206 forward decl anymore). */
2207 if (TREE_CODE (newdecl) == PARM_DECL
2208 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2210 struct c_binding *b, **here;
2212 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
2213 if ((*here)->decl == olddecl)
2220 b->prev = current_scope->bindings;
2221 current_scope->bindings = b;
2223 TREE_ASM_WRITTEN (olddecl) = 0;
2226 DECL_ATTRIBUTES (newdecl)
2227 = targetm.merge_decl_attributes (olddecl, newdecl);
2229 /* Merge the data types specified in the two decls. */
2231 = TREE_TYPE (olddecl)
2232 = composite_type (newtype, oldtype);
2234 /* Lay the type out, unless already done. */
2235 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
2237 if (TREE_TYPE (newdecl) != error_mark_node)
2238 layout_type (TREE_TYPE (newdecl));
2239 if (TREE_CODE (newdecl) != FUNCTION_DECL
2240 && TREE_CODE (newdecl) != TYPE_DECL
2241 && TREE_CODE (newdecl) != CONST_DECL)
2242 layout_decl (newdecl, 0);
2246 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2247 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
2248 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
2249 DECL_MODE (newdecl) = DECL_MODE (olddecl);
2250 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2252 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2253 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2257 /* Keep the old rtl since we can safely use it. */
2258 if (HAS_RTL_P (olddecl))
2259 COPY_DECL_RTL (olddecl, newdecl);
2261 /* Merge the type qualifiers. */
2262 if (TREE_READONLY (newdecl))
2263 TREE_READONLY (olddecl) = 1;
2265 if (TREE_THIS_VOLATILE (newdecl))
2266 TREE_THIS_VOLATILE (olddecl) = 1;
2268 /* Merge deprecatedness. */
2269 if (TREE_DEPRECATED (newdecl))
2270 TREE_DEPRECATED (olddecl) = 1;
2272 /* If a decl is in a system header and the other isn't, keep the one on the
2273 system header. Otherwise, keep source location of definition rather than
2274 declaration and of prototype rather than non-prototype unless that
2275 prototype is built-in. */
2276 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2277 && DECL_IN_SYSTEM_HEADER (olddecl)
2278 && !DECL_IN_SYSTEM_HEADER (newdecl) )
2279 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2280 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2281 && DECL_IN_SYSTEM_HEADER (newdecl)
2282 && !DECL_IN_SYSTEM_HEADER (olddecl))
2283 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
2284 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
2285 || (old_is_prototype && !new_is_prototype
2286 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
2287 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2289 /* Merge the initialization information. */
2290 if (DECL_INITIAL (newdecl) == 0)
2291 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2293 /* Merge the threadprivate attribute. */
2294 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
2296 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
2297 C_DECL_THREADPRIVATE_P (newdecl) = 1;
2300 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
2302 /* Merge the section attribute.
2303 We want to issue an error if the sections conflict but that
2304 must be done later in decl_attributes since we are called
2305 before attributes are assigned. */
2306 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
2307 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
2309 /* Copy the assembler name.
2310 Currently, it can only be defined in the prototype. */
2311 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2313 /* Use visibility of whichever declaration had it specified */
2314 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2316 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2317 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2320 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2322 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2323 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2324 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2325 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2326 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2327 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2328 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2329 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2330 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2331 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2332 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
2335 /* Merge the storage class information. */
2336 merge_weak (newdecl, olddecl);
2338 /* For functions, static overrides non-static. */
2339 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2341 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2342 /* This is since we don't automatically
2343 copy the attributes of NEWDECL into OLDDECL. */
2344 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2345 /* If this clears `static', clear it in the identifier too. */
2346 if (!TREE_PUBLIC (olddecl))
2347 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2351 /* In c99, 'extern' declaration before (or after) 'inline' means this
2352 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2354 if (TREE_CODE (newdecl) == FUNCTION_DECL
2355 && !flag_gnu89_inline
2356 && (DECL_DECLARED_INLINE_P (newdecl)
2357 || DECL_DECLARED_INLINE_P (olddecl))
2358 && (!DECL_DECLARED_INLINE_P (newdecl)
2359 || !DECL_DECLARED_INLINE_P (olddecl)
2360 || !DECL_EXTERNAL (olddecl))
2361 && DECL_EXTERNAL (newdecl)
2362 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
2363 && !current_function_decl)
2364 DECL_EXTERNAL (newdecl) = 0;
2366 /* An inline definition following a static declaration is not
2368 if (new_is_definition
2369 && (DECL_DECLARED_INLINE_P (newdecl)
2370 || DECL_DECLARED_INLINE_P (olddecl))
2371 && !TREE_PUBLIC (olddecl))
2372 DECL_EXTERNAL (newdecl) = 0;
2374 if (DECL_EXTERNAL (newdecl))
2376 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2377 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2379 /* An extern decl does not override previous storage class. */
2380 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2381 if (!DECL_EXTERNAL (newdecl))
2383 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2384 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2389 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2390 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2393 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2395 /* If we're redefining a function previously defined as extern
2396 inline, make sure we emit debug info for the inline before we
2397 throw it away, in case it was inlined into a function that
2398 hasn't been written out yet. */
2399 if (new_is_definition && DECL_INITIAL (olddecl))
2400 /* The new defn must not be inline. */
2401 DECL_UNINLINABLE (newdecl) = 1;
2404 /* If either decl says `inline', this fn is inline, unless
2405 its definition was passed already. */
2406 if (DECL_DECLARED_INLINE_P (newdecl)
2407 || DECL_DECLARED_INLINE_P (olddecl))
2408 DECL_DECLARED_INLINE_P (newdecl) = 1;
2410 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2411 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2413 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2414 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2415 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2416 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2419 if (DECL_BUILT_IN (olddecl))
2421 /* If redeclaring a builtin function, it stays built in.
2422 But it gets tagged as having been declared. */
2423 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2424 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2425 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
2426 if (new_is_prototype)
2428 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
2429 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2431 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2434 /* If a compatible prototype of these builtin functions
2435 is seen, assume the runtime implements it with the
2436 expected semantics. */
2437 case BUILT_IN_STPCPY:
2438 if (builtin_decl_explicit_p (fncode))
2439 set_builtin_decl_implicit_p (fncode, true);
2447 C_DECL_BUILTIN_PROTOTYPE (newdecl)
2448 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
2451 /* Preserve function specific target and optimization options */
2452 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2453 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2454 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2455 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2457 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2458 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2459 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2460 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2462 /* Also preserve various other info from the definition. */
2463 if (!new_is_definition)
2466 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2467 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2468 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2469 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2470 DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl));
2471 for (t = DECL_ARGUMENTS (newdecl); t ; t = DECL_CHAIN (t))
2472 DECL_CONTEXT (t) = newdecl;
2474 /* See if we've got a function to instantiate from. */
2475 if (DECL_SAVED_TREE (olddecl))
2476 DECL_ABSTRACT_ORIGIN (newdecl)
2477 = DECL_ABSTRACT_ORIGIN (olddecl);
2481 /* Merge the USED information. */
2482 if (TREE_USED (olddecl))
2483 TREE_USED (newdecl) = 1;
2484 else if (TREE_USED (newdecl))
2485 TREE_USED (olddecl) = 1;
2486 if (TREE_CODE (olddecl) == VAR_DECL || TREE_CODE (olddecl) == PARM_DECL)
2487 DECL_READ_P (newdecl) |= DECL_READ_P (olddecl);
2488 if (DECL_PRESERVE_P (olddecl))
2489 DECL_PRESERVE_P (newdecl) = 1;
2490 else if (DECL_PRESERVE_P (newdecl))
2491 DECL_PRESERVE_P (olddecl) = 1;
2493 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2494 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2495 DECL_ARGUMENTS (if appropriate). */
2497 unsigned olddecl_uid = DECL_UID (olddecl);
2498 tree olddecl_context = DECL_CONTEXT (olddecl);
2499 tree olddecl_arguments = NULL;
2500 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2501 olddecl_arguments = DECL_ARGUMENTS (olddecl);
2503 memcpy ((char *) olddecl + sizeof (struct tree_common),
2504 (char *) newdecl + sizeof (struct tree_common),
2505 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2506 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2507 switch (TREE_CODE (olddecl))
2512 struct symtab_node *snode = olddecl->decl_with_vis.symtab_node;
2514 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2515 (char *) newdecl + sizeof (struct tree_decl_common),
2516 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2517 olddecl->decl_with_vis.symtab_node = snode;
2527 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2528 (char *) newdecl + sizeof (struct tree_decl_common),
2529 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2534 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2535 (char *) newdecl + sizeof (struct tree_decl_common),
2536 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
2538 DECL_UID (olddecl) = olddecl_uid;
2539 DECL_CONTEXT (olddecl) = olddecl_context;
2540 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2541 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
2544 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2545 so that encode_section_info has a chance to look at the new decl
2546 flags and attributes. */
2547 if (DECL_RTL_SET_P (olddecl)
2548 && (TREE_CODE (olddecl) == FUNCTION_DECL
2549 || (TREE_CODE (olddecl) == VAR_DECL
2550 && TREE_STATIC (olddecl))))
2551 make_decl_rtl (olddecl);
2554 /* Handle when a new declaration NEWDECL has the same name as an old
2555 one OLDDECL in the same binding contour. Prints an error message
2558 If safely possible, alter OLDDECL to look like NEWDECL, and return
2559 true. Otherwise, return false. */
2562 duplicate_decls (tree newdecl, tree olddecl)
2564 tree newtype = NULL, oldtype = NULL;
2566 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
2568 /* Avoid `unused variable' and other warnings for OLDDECL. */
2569 TREE_NO_WARNING (olddecl) = 1;
2573 merge_decls (newdecl, olddecl, newtype, oldtype);
2575 /* The NEWDECL will no longer be needed. */
2581 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2583 warn_if_shadowing (tree new_decl)
2585 struct c_binding *b;
2587 /* Shadow warnings wanted? */
2589 /* No shadow warnings for internally generated vars. */
2590 || DECL_IS_BUILTIN (new_decl)
2591 /* No shadow warnings for vars made for inlining. */
2592 || DECL_FROM_INLINE (new_decl))
2595 /* Is anything being shadowed? Invisible decls do not count. */
2596 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
2597 if (b->decl && b->decl != new_decl && !b->invisible
2598 && (b->decl == error_mark_node
2599 || diagnostic_report_warnings_p (global_dc,
2600 DECL_SOURCE_LOCATION (b->decl))))
2602 tree old_decl = b->decl;
2604 if (old_decl == error_mark_node)
2606 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
2607 "non-variable", new_decl);
2610 else if (TREE_CODE (old_decl) == PARM_DECL)
2611 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
2613 else if (DECL_FILE_SCOPE_P (old_decl))
2615 /* Do not warn if a variable shadows a function, unless
2616 the variable is a function or a pointer-to-function. */
2617 if (TREE_CODE (old_decl) == FUNCTION_DECL
2618 && TREE_CODE (new_decl) != FUNCTION_DECL
2619 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl)))
2622 warning_at (DECL_SOURCE_LOCATION (new_decl), OPT_Wshadow,
2623 "declaration of %qD shadows a global declaration",
2626 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2627 && DECL_BUILT_IN (old_decl))
2629 warning (OPT_Wshadow, "declaration of %q+D shadows "
2630 "a built-in function", new_decl);
2634 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
2637 warning_at (DECL_SOURCE_LOCATION (old_decl), OPT_Wshadow,
2638 "shadowed declaration is here");
2644 /* Record a decl-node X as belonging to the current lexical scope.
2645 Check for errors (such as an incompatible declaration for the same
2646 name already seen in the same scope).
2648 Returns either X or an old decl for the same name.
2649 If an old decl is returned, it may have been smashed
2650 to agree with what X says. */
2655 tree name = DECL_NAME (x);
2656 struct c_scope *scope = current_scope;
2657 struct c_binding *b;
2658 bool nested = false;
2659 location_t locus = DECL_SOURCE_LOCATION (x);
2661 /* Must set DECL_CONTEXT for everything not at file scope or
2662 DECL_FILE_SCOPE_P won't work. Local externs don't count
2663 unless they have initializers (which generate code). */
2664 if (current_function_decl
2665 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2666 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2667 DECL_CONTEXT (x) = current_function_decl;
2669 /* Anonymous decls are just inserted in the scope. */
2672 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
2677 /* First, see if there is another declaration with the same name in
2678 the current scope. If there is, duplicate_decls may do all the
2679 work for us. If duplicate_decls returns false, that indicates
2680 two incompatible decls in the same scope; we are to silently
2681 replace the old one (duplicate_decls has issued all appropriate
2682 diagnostics). In particular, we should not consider possible
2683 duplicates in the external scope, or shadowing. */
2684 b = I_SYMBOL_BINDING (name);
2685 if (b && B_IN_SCOPE (b, scope))
2687 struct c_binding *b_ext, *b_use;
2688 tree type = TREE_TYPE (x);
2689 tree visdecl = b->decl;
2690 tree vistype = TREE_TYPE (visdecl);
2691 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2692 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2693 b->inner_comp = false;
2696 /* If this is an external linkage declaration, we should check
2697 for compatibility with the type in the external scope before
2698 setting the type at this scope based on the visible
2699 information only. */
2700 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2702 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2703 b_ext = b_ext->shadowed;
2708 TREE_TYPE (b_use->decl) = b_use->u.type;
2711 if (duplicate_decls (x, b_use->decl))
2715 /* Save the updated type in the external scope and
2716 restore the proper type for this scope. */
2718 if (comptypes (vistype, type))
2719 thistype = composite_type (vistype, type);
2721 thistype = TREE_TYPE (b_use->decl);
2722 b_use->u.type = TREE_TYPE (b_use->decl);
2723 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2724 && DECL_BUILT_IN (b_use->decl))
2726 = build_type_attribute_variant (thistype,
2729 TREE_TYPE (b_use->decl) = thistype;
2734 goto skip_external_and_shadow_checks;
2737 /* All declarations with external linkage, and all external
2738 references, go in the external scope, no matter what scope is
2739 current. However, the binding in that scope is ignored for
2740 purposes of normal name lookup. A separate binding structure is
2741 created in the requested scope; this governs the normal
2742 visibility of the symbol.
2744 The binding in the externals scope is used exclusively for
2745 detecting duplicate declarations of the same object, no matter
2746 what scope they are in; this is what we do here. (C99 6.2.7p2:
2747 All declarations that refer to the same object or function shall
2748 have compatible type; otherwise, the behavior is undefined.) */
2749 if (DECL_EXTERNAL (x) || scope == file_scope)
2751 tree type = TREE_TYPE (x);
2754 bool type_saved = false;
2755 if (b && !B_IN_EXTERNAL_SCOPE (b)
2756 && (TREE_CODE (b->decl) == FUNCTION_DECL
2757 || TREE_CODE (b->decl) == VAR_DECL)
2758 && DECL_FILE_SCOPE_P (b->decl))
2761 vistype = TREE_TYPE (visdecl);
2763 if (scope != file_scope
2764 && !DECL_IN_SYSTEM_HEADER (x))
2765 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2767 while (b && !B_IN_EXTERNAL_SCOPE (b))
2769 /* If this decl might be modified, save its type. This is
2770 done here rather than when the decl is first bound
2771 because the type may change after first binding, through
2772 being completed or through attributes being added. If we
2773 encounter multiple such decls, only the first should have
2774 its type saved; the others will already have had their
2775 proper types saved and the types will not have changed as
2776 their scopes will not have been re-entered. */
2777 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2779 b->u.type = TREE_TYPE (b->decl);
2782 if (B_IN_FILE_SCOPE (b)
2783 && TREE_CODE (b->decl) == VAR_DECL
2784 && TREE_STATIC (b->decl)
2785 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2786 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2787 && TREE_CODE (type) == ARRAY_TYPE
2788 && TYPE_DOMAIN (type)
2789 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2790 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2792 /* Array type completed in inner scope, which should be
2793 diagnosed if the completion does not have size 1 and
2794 it does not get completed in the file scope. */
2795 b->inner_comp = true;
2800 /* If a matching external declaration has been found, set its
2801 type to the composite of all the types of that declaration.
2802 After the consistency checks, it will be reset to the
2803 composite of the visible types only. */
2804 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2806 TREE_TYPE (b->decl) = b->u.type;
2808 /* The point of the same_translation_unit_p check here is,
2809 we want to detect a duplicate decl for a construct like
2810 foo() { extern bar(); } ... static bar(); but not if
2811 they are in different translation units. In any case,
2812 the static does not go in the externals scope. */
2814 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2815 && duplicate_decls (x, b->decl))
2820 if (comptypes (vistype, type))
2821 thistype = composite_type (vistype, type);
2823 thistype = TREE_TYPE (b->decl);
2827 b->u.type = TREE_TYPE (b->decl);
2828 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2830 = build_type_attribute_variant (thistype,
2831 TYPE_ATTRIBUTES (b->u.type));
2832 TREE_TYPE (b->decl) = thistype;
2833 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
2837 else if (TREE_PUBLIC (x))
2839 if (visdecl && !b && duplicate_decls (x, visdecl))
2841 /* An external declaration at block scope referring to a
2842 visible entity with internal linkage. The composite
2843 type will already be correct for this scope, so we
2844 just need to fall through to make the declaration in
2851 bind (name, x, external_scope, /*invisible=*/true,
2852 /*nested=*/false, locus);
2858 if (TREE_CODE (x) != PARM_DECL)
2859 warn_if_shadowing (x);
2861 skip_external_and_shadow_checks:
2862 if (TREE_CODE (x) == TYPE_DECL)
2864 /* So this is a typedef, set its underlying type. */
2865 set_underlying_type (x);
2867 /* If X is a typedef defined in the current function, record it
2868 for the purpose of implementing the -Wunused-local-typedefs
2870 record_locally_defined_typedef (x);
2873 bind (name, x, scope, /*invisible=*/false, nested, locus);
2875 /* If x's type is incomplete because it's based on a
2876 structure or union which has not yet been fully declared,
2877 attach it to that structure or union type, so we can go
2878 back and complete the variable declaration later, if the
2879 structure or union gets fully declared.
2881 If the input is erroneous, we can have error_mark in the type
2882 slot (e.g. "f(void a, ...)") - that doesn't count as an
2884 if (TREE_TYPE (x) != error_mark_node
2885 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2887 tree element = TREE_TYPE (x);
2889 while (TREE_CODE (element) == ARRAY_TYPE)
2890 element = TREE_TYPE (element);
2891 element = TYPE_MAIN_VARIANT (element);
2893 if ((TREE_CODE (element) == RECORD_TYPE
2894 || TREE_CODE (element) == UNION_TYPE)
2895 && (TREE_CODE (x) != TYPE_DECL
2896 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2897 && !COMPLETE_TYPE_P (element))
2898 C_TYPE_INCOMPLETE_VARS (element)
2899 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2904 /* Record X as belonging to file scope.
2905 This is used only internally by the Objective-C front end,
2906 and is limited to its needs. duplicate_decls is not called;
2907 if there is any preexisting decl for this identifier, it is an ICE. */
2910 pushdecl_top_level (tree x)
2913 bool nested = false;
2914 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2916 name = DECL_NAME (x);
2918 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2920 if (TREE_PUBLIC (x))
2922 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false,
2927 bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION);
2933 implicit_decl_warning (tree id, tree olddecl)
2935 if (warn_implicit_function_declaration)
2940 warned = pedwarn (input_location, OPT_Wimplicit_function_declaration,
2941 "implicit declaration of function %qE", id);
2943 warned = warning (OPT_Wimplicit_function_declaration,
2944 G_("implicit declaration of function %qE"), id);
2945 if (olddecl && warned)
2946 locate_old_decl (olddecl);
2950 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2951 function of type int (). */
2954 implicitly_declare (location_t loc, tree functionid)
2956 struct c_binding *b;
2960 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2962 if (B_IN_SCOPE (b, external_scope))
2971 if (decl == error_mark_node)
2974 /* FIXME: Objective-C has weird not-really-builtin functions
2975 which are supposed to be visible automatically. They wind up
2976 in the external scope because they're pushed before the file
2977 scope gets created. Catch this here and rebind them into the
2979 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2981 bind (functionid, decl, file_scope,
2982 /*invisible=*/false, /*nested=*/true,
2983 DECL_SOURCE_LOCATION (decl));
2988 tree newtype = default_function_type;
2990 TREE_TYPE (decl) = b->u.type;
2991 /* Implicit declaration of a function already declared
2992 (somehow) in a different scope, or as a built-in.
2993 If this is the first time this has happened, warn;
2994 then recycle the old declaration but with the new type. */
2995 if (!C_DECL_IMPLICIT (decl))
2997 implicit_decl_warning (functionid, decl);
2998 C_DECL_IMPLICIT (decl) = 1;
3000 if (DECL_BUILT_IN (decl))
3002 newtype = build_type_attribute_variant (newtype,
3004 (TREE_TYPE (decl)));
3005 if (!comptypes (newtype, TREE_TYPE (decl)))
3007 warning_at (loc, 0, "incompatible implicit declaration of "
3008 "built-in function %qD", decl);
3009 newtype = TREE_TYPE (decl);
3014 if (!comptypes (newtype, TREE_TYPE (decl)))
3016 error_at (loc, "incompatible implicit declaration of function %qD", decl);
3017 locate_old_decl (decl);
3020 b->u.type = TREE_TYPE (decl);
3021 TREE_TYPE (decl) = newtype;
3022 bind (functionid, decl, current_scope,
3023 /*invisible=*/false, /*nested=*/true,
3024 DECL_SOURCE_LOCATION (decl));
3029 /* Not seen before. */
3030 decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type);
3031 DECL_EXTERNAL (decl) = 1;
3032 TREE_PUBLIC (decl) = 1;
3033 C_DECL_IMPLICIT (decl) = 1;
3034 implicit_decl_warning (functionid, 0);
3035 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
3037 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
3039 /* C89 says implicit declarations are in the innermost block.
3040 So we record the decl in the standard fashion. */
3041 decl = pushdecl (decl);
3043 /* No need to call objc_check_decl here - it's a function type. */
3044 rest_of_decl_compilation (decl, 0, 0);
3046 /* Write a record describing this implicit function declaration
3047 to the prototypes file (if requested). */
3048 gen_aux_info_record (decl, 0, 1, 0);
3050 /* Possibly apply some default attributes to this implicit declaration. */
3051 decl_attributes (&decl, NULL_TREE, 0);
3056 /* Issue an error message for a reference to an undeclared variable
3057 ID, including a reference to a builtin outside of function-call
3058 context. Establish a binding of the identifier to error_mark_node
3059 in an appropriate scope, which will suppress further errors for the
3060 same identifier. The error message should be given location LOC. */
3062 undeclared_variable (location_t loc, tree id)
3064 static bool already = false;
3065 struct c_scope *scope;
3067 if (current_function_decl == 0)
3069 error_at (loc, "%qE undeclared here (not in a function)", id);
3070 scope = current_scope;
3074 if (!objc_diagnose_private_ivar (id))
3075 error_at (loc, "%qE undeclared (first use in this function)", id);
3078 inform (loc, "each undeclared identifier is reported only"
3079 " once for each function it appears in");
3083 /* If we are parsing old-style parameter decls, current_function_decl
3084 will be nonnull but current_function_scope will be null. */
3085 scope = current_function_scope ? current_function_scope : current_scope;
3087 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
3091 /* Subroutine of lookup_label, declare_label, define_label: construct a
3092 LABEL_DECL with all the proper frills. Also create a struct
3093 c_label_vars initialized for the current scope. */
3096 make_label (location_t location, tree name, bool defining,
3097 struct c_label_vars **p_label_vars)
3099 tree label = build_decl (location, LABEL_DECL, name, void_type_node);
3100 DECL_CONTEXT (label) = current_function_decl;
3101 DECL_MODE (label) = VOIDmode;
3103 c_label_vars *label_vars = ggc_alloc<c_label_vars> ();
3104 label_vars->shadowed = NULL;
3105 set_spot_bindings (&label_vars->label_bindings, defining);
3106 label_vars->decls_in_scope = make_tree_vector ();
3107 label_vars->gotos = NULL;
3108 *p_label_vars = label_vars;
3113 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3114 Create one if none exists so far for the current function.
3115 This is called when a label is used in a goto expression or
3116 has its address taken. */
3119 lookup_label (tree name)
3122 struct c_label_vars *label_vars;
3124 if (current_function_scope == 0)
3126 error ("label %qE referenced outside of any function", name);
3130 /* Use a label already defined or ref'd with this name, but not if
3131 it is inherited from a containing function and wasn't declared
3133 label = I_LABEL_DECL (name);
3134 if (label && (DECL_CONTEXT (label) == current_function_decl
3135 || C_DECLARED_LABEL_FLAG (label)))
3137 /* If the label has only been declared, update its apparent
3138 location to point here, for better diagnostics if it
3139 turns out not to have been defined. */
3140 if (DECL_INITIAL (label) == NULL_TREE)
3141 DECL_SOURCE_LOCATION (label) = input_location;
3145 /* No label binding for that identifier; make one. */
3146 label = make_label (input_location, name, false, &label_vars);
3148 /* Ordinary labels go in the current function scope. */
3149 bind_label (name, label, current_function_scope, label_vars);
3154 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3158 warn_about_goto (location_t goto_loc, tree label, tree decl)
3160 if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3162 "jump into scope of identifier with variably modified type");
3164 warning_at (goto_loc, OPT_Wjump_misses_init,
3165 "jump skips variable initialization");
3166 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3167 inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl);
3170 /* Look up a label because of a goto statement. This is like
3171 lookup_label, but also issues any appropriate warnings. */
3174 lookup_label_for_goto (location_t loc, tree name)
3177 struct c_label_vars *label_vars;
3181 label = lookup_label (name);
3182 if (label == NULL_TREE)
3185 /* If we are jumping to a different function, we can't issue any
3187 if (DECL_CONTEXT (label) != current_function_decl)
3189 gcc_assert (C_DECLARED_LABEL_FLAG (label));
3193 label_vars = I_LABEL_BINDING (name)->u.label;
3195 /* If the label has not yet been defined, then push this goto on a
3196 list for possible later warnings. */
3197 if (label_vars->label_bindings.scope == NULL)
3199 c_goto_bindings *g = ggc_alloc<c_goto_bindings> ();
3202 set_spot_bindings (&g->goto_bindings, true);
3203 vec_safe_push (label_vars->gotos, g);
3207 /* If there are any decls in label_vars->decls_in_scope, then this
3208 goto has missed the declaration of the decl. This happens for a
3214 Issue a warning or error. */
3215 FOR_EACH_VEC_SAFE_ELT (label_vars->decls_in_scope, ix, decl)
3216 warn_about_goto (loc, label, decl);
3218 if (label_vars->label_bindings.left_stmt_expr)
3220 error_at (loc, "jump into statement expression");
3221 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3227 /* Make a label named NAME in the current function, shadowing silently
3228 any that may be inherited from containing functions or containing
3229 scopes. This is called for __label__ declarations. */
3232 declare_label (tree name)
3234 struct c_binding *b = I_LABEL_BINDING (name);
3236 struct c_label_vars *label_vars;
3238 /* Check to make sure that the label hasn't already been declared
3240 if (b && B_IN_CURRENT_SCOPE (b))
3242 error ("duplicate label declaration %qE", name);
3243 locate_old_decl (b->decl);
3245 /* Just use the previous declaration. */
3249 label = make_label (input_location, name, false, &label_vars);
3250 C_DECLARED_LABEL_FLAG (label) = 1;
3252 /* Declared labels go in the current scope. */
3253 bind_label (name, label, current_scope, label_vars);
3258 /* When we define a label, issue any appropriate warnings if there are
3259 any gotos earlier in the function which jump to this label. */
3262 check_earlier_gotos (tree label, struct c_label_vars* label_vars)
3265 struct c_goto_bindings *g;
3267 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
3269 struct c_binding *b;
3270 struct c_scope *scope;
3272 /* We have a goto to this label. The goto is going forward. In
3273 g->scope, the goto is going to skip any binding which was
3274 defined after g->bindings_in_scope. */
3275 if (g->goto_bindings.scope->has_jump_unsafe_decl)
3277 for (b = g->goto_bindings.scope->bindings;
3278 b != g->goto_bindings.bindings_in_scope;
3281 if (decl_jump_unsafe (b->decl))
3282 warn_about_goto (g->loc, label, b->decl);
3286 /* We also need to warn about decls defined in any scopes
3287 between the scope of the label and the scope of the goto. */
3288 for (scope = label_vars->label_bindings.scope;
3289 scope != g->goto_bindings.scope;
3290 scope = scope->outer)
3292 gcc_assert (scope != NULL);
3293 if (scope->has_jump_unsafe_decl)
3295 if (scope == label_vars->label_bindings.scope)
3296 b = label_vars->label_bindings.bindings_in_scope;
3298 b = scope->bindings;
3299 for (; b != NULL; b = b->prev)
3301 if (decl_jump_unsafe (b->decl))
3302 warn_about_goto (g->loc, label, b->decl);
3307 if (g->goto_bindings.stmt_exprs > 0)
3309 error_at (g->loc, "jump into statement expression");
3310 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here",
3315 /* Now that the label is defined, we will issue warnings about
3316 subsequent gotos to this label when we see them. */
3317 vec_safe_truncate (label_vars->gotos, 0);
3318 label_vars->gotos = NULL;
3321 /* Define a label, specifying the location in the source file.
3322 Return the LABEL_DECL node for the label, if the definition is valid.
3323 Otherwise return 0. */
3326 define_label (location_t location, tree name)
3328 /* Find any preexisting label with this name. It is an error
3329 if that label has already been defined in this function, or
3330 if there is a containing function with a declared label with
3332 tree label = I_LABEL_DECL (name);
3335 && ((DECL_CONTEXT (label) == current_function_decl
3336 && DECL_INITIAL (label) != 0)
3337 || (DECL_CONTEXT (label) != current_function_decl
3338 && C_DECLARED_LABEL_FLAG (label))))
3340 error_at (location, "duplicate label %qD", label);
3341 locate_old_decl (label);
3344 else if (label && DECL_CONTEXT (label) == current_function_decl)
3346 struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label;
3348 /* The label has been used or declared already in this function,
3349 but not defined. Update its location to point to this
3351 DECL_SOURCE_LOCATION (label) = location;
3352 set_spot_bindings (&label_vars->label_bindings, true);
3354 /* Issue warnings as required about any goto statements from
3355 earlier in the function. */
3356 check_earlier_gotos (label, label_vars);
3360 struct c_label_vars *label_vars;
3362 /* No label binding for that identifier; make one. */
3363 label = make_label (location, name, true, &label_vars);
3365 /* Ordinary labels go in the current function scope. */
3366 bind_label (name, label, current_function_scope, label_vars);
3369 if (!in_system_header_at (input_location) && lookup_name (name))
3370 warning_at (location, OPT_Wtraditional,
3371 "traditional C lacks a separate namespace "
3372 "for labels, identifier %qE conflicts", name);
3374 /* Mark label as having been defined. */
3375 DECL_INITIAL (label) = error_mark_node;
3379 /* Get the bindings for a new switch statement. This is used to issue
3380 warnings as appropriate for jumps from the switch to case or
3383 struct c_spot_bindings *
3384 c_get_switch_bindings (void)
3386 struct c_spot_bindings *switch_bindings;
3388 switch_bindings = XNEW (struct c_spot_bindings);
3389 set_spot_bindings (switch_bindings, true);
3390 return switch_bindings;
3394 c_release_switch_bindings (struct c_spot_bindings *bindings)
3396 gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr);
3400 /* This is called at the point of a case or default label to issue
3401 warnings about decls as needed. It returns true if it found an
3402 error, not just a warning. */
3405 c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings,
3406 location_t switch_loc, location_t case_loc)
3409 struct c_scope *scope;
3412 for (scope = current_scope;
3413 scope != switch_bindings->scope;
3414 scope = scope->outer)
3416 struct c_binding *b;
3418 gcc_assert (scope != NULL);
3420 if (!scope->has_jump_unsafe_decl)
3423 for (b = scope->bindings; b != NULL; b = b->prev)
3425 if (decl_jump_unsafe (b->decl))
3427 if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE))
3431 ("switch jumps into scope of identifier with "
3432 "variably modified type"));
3435 warning_at (case_loc, OPT_Wjump_misses_init,
3436 "switch jumps over variable initialization");
3437 inform (switch_loc, "switch starts here");
3438 inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here",
3444 if (switch_bindings->stmt_exprs > 0)
3447 error_at (case_loc, "switch jumps into statement expression");
3448 inform (switch_loc, "switch starts here");
3454 /* Given NAME, an IDENTIFIER_NODE,
3455 return the structure (or union or enum) definition for that name.
3456 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3457 CODE says which kind of type the caller wants;
3458 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3459 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3460 location where the tag was defined.
3461 If the wrong kind of type is found, an error is reported. */
3464 lookup_tag (enum tree_code code, tree name, int thislevel_only,
3467 struct c_binding *b = I_TAG_BINDING (name);
3473 /* We only care about whether it's in this level if
3474 thislevel_only was set or it might be a type clash. */
3475 if (thislevel_only || TREE_CODE (b->decl) != code)
3477 /* For our purposes, a tag in the external scope is the same as
3478 a tag in the file scope. (Primarily relevant to Objective-C
3479 and its builtin structure tags, which get pushed before the
3480 file scope is created.) */
3481 if (B_IN_CURRENT_SCOPE (b)
3482 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
3486 if (thislevel_only && !thislevel)
3489 if (TREE_CODE (b->decl) != code)
3491 /* Definition isn't the kind we were looking for. */
3492 pending_invalid_xref = name;
3493 pending_invalid_xref_location = input_location;
3495 /* If in the same binding level as a declaration as a tag
3496 of a different type, this must not be allowed to
3497 shadow that tag, so give the error immediately.
3498 (For example, "struct foo; union foo;" is invalid.) */
3500 pending_xref_error ();
3509 /* Print an error message now
3510 for a recent invalid struct, union or enum cross reference.
3511 We don't print them immediately because they are not invalid
3512 when used in the `struct foo;' construct for shadowing. */
3515 pending_xref_error (void)
3517 if (pending_invalid_xref != 0)
3518 error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag",
3519 pending_invalid_xref);
3520 pending_invalid_xref = 0;
3524 /* Look up NAME in the current scope and its superiors
3525 in the namespace of variables, functions and typedefs.
3526 Return a ..._DECL node of some kind representing its definition,
3527 or return 0 if it is undefined. */
3530 lookup_name (tree name)
3532 struct c_binding *b = I_SYMBOL_BINDING (name);
3533 if (b && !b->invisible)
3535 maybe_record_typedef_use (b->decl);
3541 /* Similar to `lookup_name' but look only at the indicated scope. */
3544 lookup_name_in_scope (tree name, struct c_scope *scope)
3546 struct c_binding *b;
3548 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
3549 if (B_IN_SCOPE (b, scope))
3554 /* Create the predefined scalar types of C,
3555 and some nodes representing standard constants (0, 1, (void *) 0).
3556 Initialize the global scope.
3557 Make definitions for built-in primitive functions. */
3560 c_init_decl_processing (void)
3562 location_t save_loc = input_location;
3564 /* Initialize reserved words for parser. */
3567 current_function_decl = 0;
3569 gcc_obstack_init (&parser_obstack);
3571 /* Make the externals scope. */
3573 external_scope = current_scope;
3575 /* Declarations from c_common_nodes_and_builtins must not be associated
3576 with this input file, lest we get differences between using and not
3577 using preprocessed headers. */
3578 input_location = BUILTINS_LOCATION;
3580 c_common_nodes_and_builtins ();
3582 /* In C, comparisons and TRUTH_* expressions have type int. */
3583 truthvalue_type_node = integer_type_node;
3584 truthvalue_true_node = integer_one_node;
3585 truthvalue_false_node = integer_zero_node;
3587 /* Even in C99, which has a real boolean type. */
3588 pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"),
3589 boolean_type_node));
3591 input_location = save_loc;
3593 pedantic_lvalues = true;
3595 make_fname_decl = c_make_fname_decl;
3596 start_fname_decls ();
3599 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3600 give the decl, NAME is the initialization string and TYPE_DEP
3601 indicates whether NAME depended on the type of the function. As we
3602 don't yet implement delayed emission of static data, we mark the
3603 decl as emitted so it is not placed in the output. Anything using
3604 it must therefore pull out the STRING_CST initializer directly.
3608 c_make_fname_decl (location_t loc, tree id, int type_dep)
3610 const char *name = fname_as_string (type_dep);
3611 tree decl, type, init;
3612 size_t length = strlen (name);
3614 type = build_array_type (char_type_node,
3615 build_index_type (size_int (length)));
3616 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
3618 decl = build_decl (loc, VAR_DECL, id, type);
3620 TREE_STATIC (decl) = 1;
3621 TREE_READONLY (decl) = 1;
3622 DECL_ARTIFICIAL (decl) = 1;
3624 init = build_string (length + 1, name);
3625 free (CONST_CAST (char *, name));
3626 TREE_TYPE (init) = type;
3627 DECL_INITIAL (decl) = init;
3629 TREE_USED (decl) = 1;
3631 if (current_function_decl
3632 /* For invalid programs like this:
3635 const char* p = __FUNCTION__;
3637 the __FUNCTION__ is believed to appear in K&R style function
3638 parameter declarator. In that case we still don't have
3640 && (!seen_error () || current_function_scope))
3642 DECL_CONTEXT (decl) = current_function_decl;
3643 bind (id, decl, current_function_scope,
3644 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
3647 finish_decl (decl, loc, init, NULL_TREE, NULL_TREE);
3653 c_builtin_function (tree decl)
3655 tree type = TREE_TYPE (decl);
3656 tree id = DECL_NAME (decl);
3658 const char *name = IDENTIFIER_POINTER (id);
3659 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
3661 /* Should never be called on a symbol with a preexisting meaning. */
3662 gcc_assert (!I_SYMBOL_BINDING (id));
3664 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false,
3667 /* Builtins in the implementation namespace are made visible without
3668 needing to be explicitly declared. See push_file_scope. */
3669 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3671 DECL_CHAIN (decl) = visible_builtins;
3672 visible_builtins = decl;
3679 c_builtin_function_ext_scope (tree decl)
3681 tree type = TREE_TYPE (decl);
3682 tree id = DECL_NAME (decl);
3684 const char *name = IDENTIFIER_POINTER (id);
3685 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
3688 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false,
3691 /* Builtins in the implementation namespace are made visible without
3692 needing to be explicitly declared. See push_file_scope. */
3693 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3695 DECL_CHAIN (decl) = visible_builtins;
3696 visible_builtins = decl;
3702 /* Called when a declaration is seen that contains no names to declare.
3703 If its type is a reference to a structure, union or enum inherited
3704 from a containing scope, shadow that tag name for the current scope
3705 with a forward reference.
3706 If its type defines a new named structure or union
3707 or defines an enum, it is valid but we need not do anything here.
3708 Otherwise, it is an error. */
3711 shadow_tag (const struct c_declspecs *declspecs)
3713 shadow_tag_warned (declspecs, 0);
3716 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3719 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
3721 bool found_tag = false;
3723 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
3725 tree value = declspecs->type;
3726 enum tree_code code = TREE_CODE (value);
3728 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3729 /* Used to test also that TYPE_SIZE (value) != 0.
3730 That caused warning for `struct foo;' at top level in the file. */
3732 tree name = TYPE_NAME (value);
3737 if (declspecs->restrict_p)
3739 error ("invalid use of %<restrict%>");
3745 if (warned != 1 && code != ENUMERAL_TYPE)
3746 /* Empty unnamed enum OK */
3748 pedwarn (input_location, 0,
3749 "unnamed struct/union that defines no instances");
3753 else if (declspecs->typespec_kind != ctsk_tagdef
3754 && declspecs->typespec_kind != ctsk_tagfirstref
3755 && declspecs->storage_class != csc_none)
3758 pedwarn (input_location, 0,
3759 "empty declaration with storage class specifier "
3760 "does not redeclare tag");
3762 pending_xref_error ();
3764 else if (declspecs->typespec_kind != ctsk_tagdef
3765 && declspecs->typespec_kind != ctsk_tagfirstref
3766 && (declspecs->const_p
3767 || declspecs->volatile_p
3768 || declspecs->atomic_p
3769 || declspecs->restrict_p
3770 || declspecs->address_space))
3773 pedwarn (input_location, 0,
3774 "empty declaration with type qualifier "
3775 "does not redeclare tag");
3777 pending_xref_error ();
3779 else if (declspecs->typespec_kind != ctsk_tagdef
3780 && declspecs->typespec_kind != ctsk_tagfirstref
3781 && declspecs->alignas_p)
3784 pedwarn (input_location, 0,
3785 "empty declaration with %<_Alignas%> "
3786 "does not redeclare tag");
3788 pending_xref_error ();
3792 pending_invalid_xref = 0;
3793 t = lookup_tag (code, name, 1, NULL);
3797 t = make_node (code);
3798 pushtag (input_location, name, t);
3804 if (warned != 1 && !in_system_header_at (input_location))
3806 pedwarn (input_location, 0,
3807 "useless type name in empty declaration");
3812 else if (warned != 1 && !in_system_header_at (input_location)
3813 && declspecs->typedef_p)
3815 pedwarn (input_location, 0, "useless type name in empty declaration");
3819 pending_invalid_xref = 0;
3821 if (declspecs->inline_p)
3823 error ("%<inline%> in empty declaration");
3827 if (declspecs->noreturn_p)
3829 error ("%<_Noreturn%> in empty declaration");
3833 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
3835 error ("%<auto%> in file-scope empty declaration");
3839 if (current_scope == file_scope && declspecs->storage_class == csc_register)
3841 error ("%<register%> in file-scope empty declaration");
3845 if (!warned && !in_system_header_at (input_location)
3846 && declspecs->storage_class != csc_none)
3848 warning (0, "useless storage class specifier in empty declaration");
3852 if (!warned && !in_system_header_at (input_location) && declspecs->thread_p)
3854 warning (0, "useless %qs in empty declaration",
3855 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
3860 && !in_system_header_at (input_location)
3861 && (declspecs->const_p
3862 || declspecs->volatile_p
3863 || declspecs->atomic_p
3864 || declspecs->restrict_p
3865 || declspecs->address_space))
3867 warning (0, "useless type qualifier in empty declaration");
3871 if (!warned && !in_system_header_at (input_location)
3872 && declspecs->alignas_p)
3874 warning (0, "useless %<_Alignas%> in empty declaration");
3881 pedwarn (input_location, 0, "empty declaration");
3886 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3887 bits. SPECS represents declaration specifiers that the grammar
3888 only permits to contain type qualifiers and attributes. */
3891 quals_from_declspecs (const struct c_declspecs *specs)
3893 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3894 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3895 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0)
3896 | (specs->atomic_p ? TYPE_QUAL_ATOMIC : 0)
3897 | (ENCODE_QUAL_ADDR_SPACE (specs->address_space)));
3898 gcc_assert (!specs->type
3899 && !specs->decl_attr
3900 && specs->typespec_word == cts_none
3901 && specs->storage_class == csc_none
3902 && !specs->typedef_p
3903 && !specs->explicit_signed_p
3904 && !specs->deprecated_p
3906 && !specs->long_long_p
3909 && !specs->unsigned_p
3910 && !specs->complex_p
3912 && !specs->noreturn_p
3913 && !specs->thread_p);
3917 /* Construct an array declarator. LOC is the location of the
3918 beginning of the array (usually the opening brace). EXPR is the
3919 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3920 inside the [] (to be applied to the pointer to which a parameter
3921 array is converted). STATIC_P is true if "static" is inside the
3922 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3923 VLA of unspecified length which is nevertheless a complete type,
3924 false otherwise. The field for the contained declarator is left to
3925 be filled in by set_array_declarator_inner. */
3927 struct c_declarator *
3928 build_array_declarator (location_t loc,
3929 tree expr, struct c_declspecs *quals, bool static_p,
3932 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3933 struct c_declarator);
3934 declarator->id_loc = loc;
3935 declarator->kind = cdk_array;
3936 declarator->declarator = 0;
3937 declarator->u.array.dimen = expr;
3940 declarator->u.array.attrs = quals->attrs;
3941 declarator->u.array.quals = quals_from_declspecs (quals);
3945 declarator->u.array.attrs = NULL_TREE;
3946 declarator->u.array.quals = 0;
3948 declarator->u.array.static_p = static_p;
3949 declarator->u.array.vla_unspec_p = vla_unspec_p;
3952 if (static_p || quals != NULL)
3953 pedwarn (loc, OPT_Wpedantic,
3954 "ISO C90 does not support %<static%> or type "
3955 "qualifiers in parameter array declarators");
3957 pedwarn (loc, OPT_Wpedantic,
3958 "ISO C90 does not support %<[*]%> array declarators");
3962 if (!current_scope->parm_flag)
3965 error_at (loc, "%<[*]%> not allowed in other than "
3966 "function prototype scope");
3967 declarator->u.array.vla_unspec_p = false;
3970 current_scope->had_vla_unspec = true;
3975 /* Set the contained declarator of an array declarator. DECL is the
3976 declarator, as constructed by build_array_declarator; INNER is what
3977 appears on the left of the []. */
3979 struct c_declarator *
3980 set_array_declarator_inner (struct c_declarator *decl,
3981 struct c_declarator *inner)
3983 decl->declarator = inner;
3987 /* INIT is a constructor that forms DECL's initializer. If the final
3988 element initializes a flexible array field, add the size of that
3989 initializer to DECL's size. */
3992 add_flexible_array_elts_to_size (tree decl, tree init)
3996 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init)))
3999 elt = CONSTRUCTOR_ELTS (init)->last ().value;
4000 type = TREE_TYPE (elt);
4001 if (TREE_CODE (type) == ARRAY_TYPE
4002 && TYPE_SIZE (type) == NULL_TREE
4003 && TYPE_DOMAIN (type) != NULL_TREE
4004 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
4006 complete_array_type (&type, elt, false);
4008 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
4009 DECL_SIZE_UNIT (decl)
4010 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
4014 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4015 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4016 before the type name, and set *EXPR_CONST_OPERANDS, if
4017 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4018 appear in a constant expression. */
4021 groktypename (struct c_type_name *type_name, tree *expr,
4022 bool *expr_const_operands)
4025 tree attrs = type_name->specs->attrs;
4027 type_name->specs->attrs = NULL_TREE;
4029 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
4030 false, NULL, &attrs, expr, expr_const_operands,
4033 /* Apply attributes. */
4034 decl_attributes (&type, attrs, 0);
4039 /* Wrapper for decl_attributes that adds some implicit attributes
4040 to VAR_DECLs or FUNCTION_DECLs. */
4043 c_decl_attributes (tree *node, tree attributes, int flags)
4045 /* Add implicit "omp declare target" attribute if requested. */
4046 if (current_omp_declare_target_attribute
4047 && ((TREE_CODE (*node) == VAR_DECL && TREE_STATIC (*node))
4048 || TREE_CODE (*node) == FUNCTION_DECL))
4050 if (TREE_CODE (*node) == VAR_DECL
4051 && ((DECL_CONTEXT (*node)
4052 && TREE_CODE (DECL_CONTEXT (*node)) == FUNCTION_DECL)
4053 || (current_function_decl && !DECL_EXTERNAL (*node))))
4054 error ("%q+D in block scope inside of declare target directive",
4056 else if (TREE_CODE (*node) == VAR_DECL
4057 && !lang_hooks.types.omp_mappable_type (TREE_TYPE (*node)))
4058 error ("%q+D in declare target directive does not have mappable type",
4061 attributes = tree_cons (get_identifier ("omp declare target"),
4062 NULL_TREE, attributes);
4064 return decl_attributes (node, attributes, flags);
4068 /* Decode a declarator in an ordinary declaration or data definition.
4069 This is called as soon as the type information and variable name
4070 have been parsed, before parsing the initializer if any.
4071 Here we create the ..._DECL node, fill in its type,
4072 and put it on the list of decls for the current context.
4073 The ..._DECL node is returned as the value.
4075 Exception: for arrays where the length is not specified,
4076 the type is left null, to be filled in by `finish_decl'.
4078 Function definitions do not come here; they go to start_function
4079 instead. However, external and forward declarations of functions
4080 do go through here. Structure field declarations are done by
4081 grokfield and not through here. */
4084 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
4085 bool initialized, tree attributes)
4089 tree expr = NULL_TREE;
4090 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
4092 /* An object declared as __attribute__((deprecated)) suppresses
4093 warnings of uses of other deprecated items. */
4094 if (lookup_attribute ("deprecated", attributes))
4095 deprecated_state = DEPRECATED_SUPPRESS;
4097 decl = grokdeclarator (declarator, declspecs,
4098 NORMAL, initialized, NULL, &attributes, &expr, NULL,
4104 add_stmt (fold_convert (void_type_node, expr));
4106 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
4107 warning (OPT_Wmain, "%q+D is usually a function", decl);
4110 /* Is it valid for this decl to have an initializer at all?
4111 If not, set INITIALIZED to zero, which will indirectly
4112 tell 'finish_decl' to ignore the initializer once it is parsed. */
4113 switch (TREE_CODE (decl))
4116 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
4121 error ("function %qD is initialized like a variable", decl);
4126 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4127 error ("parameter %qD is initialized", decl);
4132 /* Don't allow initializations for incomplete types except for
4133 arrays which might be completed by the initialization. */
4135 /* This can happen if the array size is an undefined macro.
4136 We already gave a warning, so we don't need another one. */
4137 if (TREE_TYPE (decl) == error_mark_node)
4139 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
4141 /* A complete type is ok if size is fixed. */
4143 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
4144 || C_DECL_VARIABLE_SIZE (decl))
4146 error ("variable-sized object may not be initialized");
4150 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
4152 error ("variable %qD has initializer but incomplete type", decl);
4155 else if (C_DECL_VARIABLE_SIZE (decl))
4157 /* Although C99 is unclear about whether incomplete arrays
4158 of VLAs themselves count as VLAs, it does not make
4159 sense to permit them to be initialized given that
4160 ordinary VLAs may not be initialized. */
4161 error ("variable-sized object may not be initialized");
4168 if (current_scope == file_scope)
4169 TREE_STATIC (decl) = 1;
4171 /* Tell 'pushdecl' this is an initialized decl
4172 even though we don't yet have the initializer expression.
4173 Also tell 'finish_decl' it may store the real initializer. */
4174 DECL_INITIAL (decl) = error_mark_node;
4177 /* If this is a function declaration, write a record describing it to the
4178 prototypes file (if requested). */
4180 if (TREE_CODE (decl) == FUNCTION_DECL)
4181 gen_aux_info_record (decl, 0, 0, prototype_p (TREE_TYPE (decl)));
4183 /* ANSI specifies that a tentative definition which is not merged with
4184 a non-tentative definition behaves exactly like a definition with an
4185 initializer equal to zero. (Section 3.7.2)
4187 -fno-common gives strict ANSI behavior, though this tends to break
4188 a large body of code that grew up without this rule.
4190 Thread-local variables are never common, since there's no entrenched
4191 body of code to break, and it allows more efficient variable references
4192 in the presence of dynamic linking. */
4194 if (TREE_CODE (decl) == VAR_DECL
4196 && TREE_PUBLIC (decl)
4197 && !DECL_THREAD_LOCAL_P (decl)
4199 DECL_COMMON (decl) = 1;
4201 /* Set attributes here so if duplicate decl, will have proper attributes. */
4202 c_decl_attributes (&decl, attributes, 0);
4204 /* Handle gnu_inline attribute. */
4205 if (declspecs->inline_p
4206 && !flag_gnu89_inline
4207 && TREE_CODE (decl) == FUNCTION_DECL
4208 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
4209 || current_function_decl))
4211 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
4213 else if (declspecs->storage_class != csc_static)
4214 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
4217 if (TREE_CODE (decl) == FUNCTION_DECL
4218 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
4220 struct c_declarator *ce = declarator;
4222 if (ce->kind == cdk_pointer)
4223 ce = declarator->declarator;
4224 if (ce->kind == cdk_function)
4226 tree args = ce->u.arg_info->parms;
4227 for (; args; args = DECL_CHAIN (args))
4229 tree type = TREE_TYPE (args);
4230 if (type && INTEGRAL_TYPE_P (type)
4231 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4232 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
4237 if (TREE_CODE (decl) == FUNCTION_DECL
4238 && DECL_DECLARED_INLINE_P (decl)
4239 && DECL_UNINLINABLE (decl)
4240 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4241 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
4244 /* C99 6.7.4p3: An inline definition of a function with external
4245 linkage shall not contain a definition of a modifiable object
4246 with static storage duration... */
4247 if (TREE_CODE (decl) == VAR_DECL
4248 && current_scope != file_scope
4249 && TREE_STATIC (decl)
4250 && !TREE_READONLY (decl)
4251 && DECL_DECLARED_INLINE_P (current_function_decl)
4252 && DECL_EXTERNAL (current_function_decl))
4253 record_inline_static (input_location, current_function_decl,
4254 decl, csi_modifiable);
4256 if (c_dialect_objc ()
4257 && (TREE_CODE (decl) == VAR_DECL
4258 || TREE_CODE (decl) == FUNCTION_DECL))
4259 objc_check_global_decl (decl);
4261 /* Add this decl to the current scope.
4262 TEM may equal DECL or it may be a previous decl of the same name. */
4263 tem = pushdecl (decl);
4265 if (initialized && DECL_EXTERNAL (tem))
4267 DECL_EXTERNAL (tem) = 0;
4268 TREE_STATIC (tem) = 1;
4274 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4275 DECL or the non-array element type if DECL is an uninitialized array.
4276 If that type has a const member, diagnose this. */
4279 diagnose_uninitialized_cst_member (tree decl, tree type)
4282 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
4285 if (TREE_CODE (field) != FIELD_DECL)
4287 field_type = strip_array_types (TREE_TYPE (field));
4289 if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST)
4291 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4292 "uninitialized const member in %qT is invalid in C++",
4293 strip_array_types (TREE_TYPE (decl)));
4294 inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field);
4297 if (TREE_CODE (field_type) == RECORD_TYPE
4298 || TREE_CODE (field_type) == UNION_TYPE)
4299 diagnose_uninitialized_cst_member (decl, field_type);
4303 /* Finish processing of a declaration;
4304 install its initial value.
4305 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4306 If the length of an array type is not known before,
4307 it must be determined now, from the initial value, or it is an error.
4309 INIT_LOC is the location of the initial value. */
4312 finish_decl (tree decl, location_t init_loc, tree init,
4313 tree origtype, tree asmspec_tree)
4316 bool was_incomplete = (DECL_SIZE (decl) == 0);
4317 const char *asmspec = 0;
4319 /* If a name was specified, get the string. */
4320 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4321 && DECL_FILE_SCOPE_P (decl))
4322 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4324 asmspec = TREE_STRING_POINTER (asmspec_tree);
4326 if (TREE_CODE (decl) == VAR_DECL
4327 && TREE_STATIC (decl)
4328 && global_bindings_p ())
4329 /* So decl is a global variable. Record the types it uses
4330 so that we can decide later to emit debug info for them. */
4331 record_types_used_by_current_var_decl (decl);
4333 /* If `start_decl' didn't like having an initialization, ignore it now. */
4334 if (init != 0 && DECL_INITIAL (decl) == 0)
4337 /* Don't crash if parm is initialized. */
4338 if (TREE_CODE (decl) == PARM_DECL)
4342 store_init_value (init_loc, decl, init, origtype);
4344 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
4345 || TREE_CODE (decl) == FUNCTION_DECL
4346 || TREE_CODE (decl) == FIELD_DECL))
4347 objc_check_decl (decl);
4349 type = TREE_TYPE (decl);
4351 /* Deduce size of array from initialization, if not already known. */
4352 if (TREE_CODE (type) == ARRAY_TYPE
4353 && TYPE_DOMAIN (type) == 0
4354 && TREE_CODE (decl) != TYPE_DECL)
4357 = (TREE_STATIC (decl)
4358 /* Even if pedantic, an external linkage array
4359 may have incomplete type at first. */
4360 ? pedantic && !TREE_PUBLIC (decl)
4361 : !DECL_EXTERNAL (decl));
4363 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
4366 /* Get the completed type made by complete_array_type. */
4367 type = TREE_TYPE (decl);
4372 error ("initializer fails to determine size of %q+D", decl);
4377 error ("array size missing in %q+D", decl);
4378 /* If a `static' var's size isn't known,
4379 make it extern as well as static, so it does not get
4381 If it is not `static', then do not mark extern;
4382 finish_incomplete_decl will give it a default size
4383 and it will get allocated. */
4384 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4385 DECL_EXTERNAL (decl) = 1;
4389 error ("zero or negative size array %q+D", decl);
4393 /* For global variables, update the copy of the type that
4394 exists in the binding. */
4395 if (TREE_PUBLIC (decl))
4397 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
4398 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
4399 b_ext = b_ext->shadowed;
4402 if (b_ext->u.type && comptypes (b_ext->u.type, type))
4403 b_ext->u.type = composite_type (b_ext->u.type, type);
4405 b_ext->u.type = type;
4414 if (DECL_INITIAL (decl))
4415 TREE_TYPE (DECL_INITIAL (decl)) = type;
4417 relayout_decl (decl);
4420 if (TREE_CODE (decl) == VAR_DECL)
4422 if (init && TREE_CODE (init) == CONSTRUCTOR)
4423 add_flexible_array_elts_to_size (decl, init);
4425 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
4426 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
4427 layout_decl (decl, 0);
4429 if (DECL_SIZE (decl) == 0
4430 /* Don't give an error if we already gave one earlier. */
4431 && TREE_TYPE (decl) != error_mark_node
4432 && (TREE_STATIC (decl)
4433 /* A static variable with an incomplete type
4434 is an error if it is initialized.
4435 Also if it is not file scope.
4436 Otherwise, let it through, but if it is not `extern'
4437 then it may cause an error message later. */
4438 ? (DECL_INITIAL (decl) != 0
4439 || !DECL_FILE_SCOPE_P (decl))
4440 /* An automatic variable with an incomplete type
4442 : !DECL_EXTERNAL (decl)))
4444 error ("storage size of %q+D isn%'t known", decl);
4445 TREE_TYPE (decl) = error_mark_node;
4448 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4449 && DECL_SIZE (decl) != 0)
4451 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4452 constant_expression_warning (DECL_SIZE (decl));
4455 error ("storage size of %q+D isn%'t constant", decl);
4456 TREE_TYPE (decl) = error_mark_node;
4460 if (TREE_USED (type))
4462 TREE_USED (decl) = 1;
4463 DECL_READ_P (decl) = 1;
4467 /* If this is a function and an assembler name is specified, reset DECL_RTL
4468 so we can give it its new name. Also, update builtin_decl if it
4469 was a normal built-in. */
4470 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4472 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4473 set_builtin_user_assembler_name (decl, asmspec);
4474 set_user_assembler_name (decl, asmspec);
4477 /* If #pragma weak was used, mark the decl weak now. */
4478 maybe_apply_pragma_weak (decl);
4480 /* Output the assembler code and/or RTL code for variables and functions,
4481 unless the type is an undefined structure or union.
4482 If not, it will get done when the type is completed. */
4484 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4486 /* Determine the ELF visibility. */
4487 if (TREE_PUBLIC (decl))
4488 c_determine_visibility (decl);
4490 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4491 if (c_dialect_objc ())
4492 objc_check_decl (decl);
4496 /* If this is not a static variable, issue a warning.
4497 It doesn't make any sense to give an ASMSPEC for an
4498 ordinary, non-register local variable. Historically,
4499 GCC has accepted -- but ignored -- the ASMSPEC in
4501 if (!DECL_FILE_SCOPE_P (decl)
4502 && TREE_CODE (decl) == VAR_DECL
4503 && !C_DECL_REGISTER (decl)
4504 && !TREE_STATIC (decl))
4505 warning (0, "ignoring asm-specifier for non-static local "
4506 "variable %q+D", decl);
4508 set_user_assembler_name (decl, asmspec);
4511 if (DECL_FILE_SCOPE_P (decl))
4513 if (DECL_INITIAL (decl) == NULL_TREE
4514 || DECL_INITIAL (decl) == error_mark_node)
4515 /* Don't output anything
4516 when a tentative file-scope definition is seen.
4517 But at end of compilation, do output code for them. */
4518 DECL_DEFER_OUTPUT (decl) = 1;
4519 if (asmspec && C_DECL_REGISTER (decl))
4520 DECL_HARD_REGISTER (decl) = 1;
4521 rest_of_decl_compilation (decl, true, 0);
4525 /* In conjunction with an ASMSPEC, the `register'
4526 keyword indicates that we should place the variable
4527 in a particular register. */
4528 if (asmspec && C_DECL_REGISTER (decl))
4530 DECL_HARD_REGISTER (decl) = 1;
4531 /* This cannot be done for a structure with volatile
4532 fields, on which DECL_REGISTER will have been
4534 if (!DECL_REGISTER (decl))
4535 error ("cannot put object with volatile field into register");
4538 if (TREE_CODE (decl) != FUNCTION_DECL)
4540 /* If we're building a variable sized type, and we might be
4541 reachable other than via the top of the current binding
4542 level, then create a new BIND_EXPR so that we deallocate
4543 the object at the right time. */
4544 /* Note that DECL_SIZE can be null due to errors. */
4545 if (DECL_SIZE (decl)
4546 && !TREE_CONSTANT (DECL_SIZE (decl))
4547 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
4550 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
4551 TREE_SIDE_EFFECTS (bind) = 1;
4553 BIND_EXPR_BODY (bind) = push_stmt_list ();
4555 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
4561 if (!DECL_FILE_SCOPE_P (decl))
4563 /* Recompute the RTL of a local array now
4564 if it used to be an incomplete type. */
4566 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
4568 /* If we used it already as memory, it must stay in memory. */
4569 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4570 /* If it's still incomplete now, no init will save it. */
4571 if (DECL_SIZE (decl) == 0)
4572 DECL_INITIAL (decl) = 0;
4577 if (TREE_CODE (decl) == TYPE_DECL)
4579 if (!DECL_FILE_SCOPE_P (decl)
4580 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
4581 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
4583 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
4586 /* Install a cleanup (aka destructor) if one was given. */
4587 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
4589 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
4592 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
4593 tree cleanup_decl = lookup_name (cleanup_id);
4595 vec<tree, va_gc> *v;
4597 /* Build "cleanup(&decl)" for the destructor. */
4598 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
4600 v->quick_push (cleanup);
4601 cleanup = c_build_function_call_vec (DECL_SOURCE_LOCATION (decl),
4602 vNULL, cleanup_decl, v, NULL);
4605 /* Don't warn about decl unused; the cleanup uses it. */
4606 TREE_USED (decl) = 1;
4607 TREE_USED (cleanup_decl) = 1;
4608 DECL_READ_P (decl) = 1;
4610 push_cleanup (decl, cleanup, false);
4615 && TREE_CODE (decl) == VAR_DECL
4616 && !DECL_EXTERNAL (decl)
4617 && DECL_INITIAL (decl) == NULL_TREE)
4619 type = strip_array_types (type);
4620 if (TREE_READONLY (decl))
4621 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4622 "uninitialized const %qD is invalid in C++", decl);
4623 else if ((TREE_CODE (type) == RECORD_TYPE
4624 || TREE_CODE (type) == UNION_TYPE)
4625 && C_TYPE_FIELDS_READONLY (type))
4626 diagnose_uninitialized_cst_member (decl, type);
4629 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
4632 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4633 EXPR is NULL or a pointer to an expression that needs to be
4634 evaluated for the side effects of array size expressions in the
4638 grokparm (const struct c_parm *parm, tree *expr)
4640 tree attrs = parm->attrs;
4641 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
4642 NULL, &attrs, expr, NULL, DEPRECATED_NORMAL);
4644 decl_attributes (&decl, attrs, 0);
4649 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4650 and push that on the current scope. EXPR is a pointer to an
4651 expression that needs to be evaluated for the side effects of array
4652 size expressions in the parameters. */
4655 push_parm_decl (const struct c_parm *parm, tree *expr)
4657 tree attrs = parm->attrs;
4660 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
4661 &attrs, expr, NULL, DEPRECATED_NORMAL);
4662 decl_attributes (&decl, attrs, 0);
4664 decl = pushdecl (decl);
4666 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
4669 /* Mark all the parameter declarations to date as forward decls.
4670 Also diagnose use of this extension. */
4673 mark_forward_parm_decls (void)
4675 struct c_binding *b;
4677 if (pedantic && !current_scope->warned_forward_parm_decls)
4679 pedwarn (input_location, OPT_Wpedantic,
4680 "ISO C forbids forward parameter declarations");
4681 current_scope->warned_forward_parm_decls = true;
4684 for (b = current_scope->bindings; b; b = b->prev)
4685 if (TREE_CODE (b->decl) == PARM_DECL)
4686 TREE_ASM_WRITTEN (b->decl) = 1;
4689 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4690 literal, which may be an incomplete array type completed by the
4691 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4692 literal. NON_CONST is true if the initializers contain something
4693 that cannot occur in a constant expression. */
4696 build_compound_literal (location_t loc, tree type, tree init, bool non_const)
4698 /* We do not use start_decl here because we have a type, not a declarator;
4699 and do not use finish_decl because the decl should be stored inside
4700 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4705 if (type == error_mark_node
4706 || init == error_mark_node)
4707 return error_mark_node;
4709 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
4710 DECL_EXTERNAL (decl) = 0;
4711 TREE_PUBLIC (decl) = 0;
4712 TREE_STATIC (decl) = (current_scope == file_scope);
4713 DECL_CONTEXT (decl) = current_function_decl;
4714 TREE_USED (decl) = 1;
4715 DECL_READ_P (decl) = 1;
4716 TREE_TYPE (decl) = type;
4717 TREE_READONLY (decl) = (TYPE_READONLY (type)
4718 || (TREE_CODE (type) == ARRAY_TYPE
4719 && TYPE_READONLY (TREE_TYPE (type))));
4720 store_init_value (loc, decl, init, NULL_TREE);
4722 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4724 int failure = complete_array_type (&TREE_TYPE (decl),
4725 DECL_INITIAL (decl), true);
4726 /* If complete_array_type returns 3, it means that the
4727 initial value of the compound literal is empty. Allow it. */
4728 gcc_assert (failure == 0 || failure == 3);
4730 type = TREE_TYPE (decl);
4731 TREE_TYPE (DECL_INITIAL (decl)) = type;
4734 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
4736 c_incomplete_type_error (NULL_TREE, type);
4737 return error_mark_node;
4740 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
4741 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
4742 TREE_SIDE_EFFECTS (complit) = 1;
4744 layout_decl (decl, 0);
4746 if (TREE_STATIC (decl))
4748 /* This decl needs a name for the assembler output. */
4749 set_compound_literal_name (decl);
4750 DECL_DEFER_OUTPUT (decl) = 1;
4751 DECL_COMDAT (decl) = 1;
4752 DECL_ARTIFICIAL (decl) = 1;
4753 DECL_IGNORED_P (decl) = 1;
4755 rest_of_decl_compilation (decl, 1, 0);
4760 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
4761 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
4767 /* Check the type of a compound literal. Here we just check that it
4768 is valid for C++. */
4771 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
4774 && (type_name->specs->typespec_kind == ctsk_tagdef
4775 || type_name->specs->typespec_kind == ctsk_tagfirstref))
4776 warning_at (loc, OPT_Wc___compat,
4777 "defining a type in a compound literal is invalid in C++");
4780 /* Determine whether TYPE is a structure with a flexible array member,
4781 or a union containing such a structure (possibly recursively). */
4784 flexible_array_type_p (tree type)
4787 switch (TREE_CODE (type))
4790 x = TYPE_FIELDS (type);
4793 while (DECL_CHAIN (x) != NULL_TREE)
4795 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
4796 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
4797 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
4798 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
4802 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x))
4804 if (flexible_array_type_p (TREE_TYPE (x)))
4813 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4814 replacing with appropriate values if they are invalid. */
4816 check_bitfield_type_and_width (tree *type, tree *width, tree orig_name)
4819 unsigned int max_width;
4820 unsigned HOST_WIDE_INT w;
4821 const char *name = (orig_name
4822 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
4823 : _("<anonymous>"));
4825 /* Detect and ignore out of range field width and process valid
4827 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)))
4829 error ("bit-field %qs width not an integer constant", name);
4830 *width = integer_one_node;
4834 if (TREE_CODE (*width) != INTEGER_CST)
4836 *width = c_fully_fold (*width, false, NULL);
4837 if (TREE_CODE (*width) == INTEGER_CST)
4838 pedwarn (input_location, OPT_Wpedantic,
4839 "bit-field %qs width not an integer constant expression",
4842 if (TREE_CODE (*width) != INTEGER_CST)
4844 error ("bit-field %qs width not an integer constant", name);
4845 *width = integer_one_node;
4847 constant_expression_warning (*width);
4848 if (tree_int_cst_sgn (*width) < 0)
4850 error ("negative width in bit-field %qs", name);
4851 *width = integer_one_node;
4853 else if (integer_zerop (*width) && orig_name)
4855 error ("zero width for bit-field %qs", name);
4856 *width = integer_one_node;
4860 /* Detect invalid bit-field type. */
4861 if (TREE_CODE (*type) != INTEGER_TYPE
4862 && TREE_CODE (*type) != BOOLEAN_TYPE
4863 && TREE_CODE (*type) != ENUMERAL_TYPE)
4865 error ("bit-field %qs has invalid type", name);
4866 *type = unsigned_type_node;
4869 type_mv = TYPE_MAIN_VARIANT (*type);
4870 if (!in_system_header_at (input_location)
4871 && type_mv != integer_type_node
4872 && type_mv != unsigned_type_node
4873 && type_mv != boolean_type_node
4875 pedwarn (input_location, OPT_Wpedantic,
4876 "type of bit-field %qs is a GCC extension", name);
4878 max_width = TYPE_PRECISION (*type);
4880 if (0 < compare_tree_int (*width, max_width))
4882 error ("width of %qs exceeds its type", name);
4884 *width = build_int_cst (integer_type_node, w);
4887 w = tree_to_uhwi (*width);
4889 if (TREE_CODE (*type) == ENUMERAL_TYPE)
4891 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
4893 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_SIGN (*type))
4894 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_SIGN (*type)))
4895 warning (0, "%qs is narrower than values of its type", name);
4901 /* Print warning about variable length array if necessary. */
4904 warn_variable_length_array (tree name, tree size)
4906 int const_size = TREE_CONSTANT (size);
4908 if (!flag_isoc99 && pedantic && warn_vla != 0)
4913 pedwarn (input_location, OPT_Wvla,
4914 "ISO C90 forbids array %qE whose size "
4915 "can%'t be evaluated",
4918 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size "
4919 "can%'t be evaluated");
4924 pedwarn (input_location, OPT_Wvla,
4925 "ISO C90 forbids variable length array %qE",
4928 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array");
4931 else if (warn_vla > 0)
4937 "the size of array %qE can"
4938 "%'t be evaluated", name);
4941 "the size of array can %'t be evaluated");
4947 "variable length array %qE is used",
4951 "variable length array is used");
4956 /* Given declspecs and a declarator,
4957 determine the name and type of the object declared
4958 and construct a ..._DECL node for it.
4959 (In one case we can return a ..._TYPE node instead.
4960 For invalid input we sometimes return 0.)
4962 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4964 DECL_CONTEXT says which syntactic context this declaration is in:
4965 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4966 FUNCDEF for a function definition. Like NORMAL but a few different
4967 error messages in each case. Return value may be zero meaning
4968 this definition is too screwy to try to parse.
4969 PARM for a parameter declaration (either within a function prototype
4970 or before a function body). Make a PARM_DECL, or return void_type_node.
4971 TYPENAME if for a typename (in a cast or sizeof).
4972 Don't make a DECL node; just return the ..._TYPE node.
4973 FIELD for a struct or union field; make a FIELD_DECL.
4974 INITIALIZED is true if the decl has an initializer.
4975 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4976 representing the width of the bit-field.
4977 DECL_ATTRS points to the list of attributes that should be added to this
4978 decl. Any nested attributes that belong on the decl itself will be
4980 If EXPR is not NULL, any expressions that need to be evaluated as
4981 part of evaluating variably modified types will be stored in *EXPR.
4982 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4983 set to indicate whether operands in *EXPR can be used in constant
4985 DEPRECATED_STATE is a deprecated_states value indicating whether
4986 deprecation warnings should be suppressed.
4988 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4989 It may also be so in the PARM case, for a prototype where the
4990 argument type is specified but not the name.
4992 This function is where the complicated C meanings of `static'
4993 and `extern' are interpreted. */
4996 grokdeclarator (const struct c_declarator *declarator,
4997 struct c_declspecs *declspecs,
4998 enum decl_context decl_context, bool initialized, tree *width,
4999 tree *decl_attrs, tree *expr, bool *expr_const_operands,
5000 enum deprecated_states deprecated_state)
5002 tree type = declspecs->type;
5003 bool threadp = declspecs->thread_p;
5004 enum c_storage_class storage_class = declspecs->storage_class;
5009 int type_quals = TYPE_UNQUALIFIED;
5010 tree name = NULL_TREE;
5011 bool funcdef_flag = false;
5012 bool funcdef_syntax = false;
5013 bool size_varies = false;
5014 tree decl_attr = declspecs->decl_attr;
5015 int array_ptr_quals = TYPE_UNQUALIFIED;
5016 tree array_ptr_attrs = NULL_TREE;
5017 int array_parm_static = 0;
5018 bool array_parm_vla_unspec_p = false;
5019 tree returned_attrs = NULL_TREE;
5020 bool bitfield = width != NULL;
5022 struct c_arg_info *arg_info = 0;
5023 addr_space_t as1, as2, address_space;
5024 location_t loc = UNKNOWN_LOCATION;
5027 bool expr_const_operands_dummy;
5028 enum c_declarator_kind first_non_attr_kind;
5029 unsigned int alignas_align = 0;
5031 if (TREE_CODE (type) == ERROR_MARK)
5032 return error_mark_node;
5035 if (expr_const_operands == NULL)
5036 expr_const_operands = &expr_const_operands_dummy;
5038 *expr = declspecs->expr;
5039 *expr_const_operands = declspecs->expr_const_operands;
5041 if (decl_context == FUNCDEF)
5042 funcdef_flag = true, decl_context = NORMAL;
5044 /* Look inside a declarator for the name being declared
5045 and get it as an IDENTIFIER_NODE, for an error message. */
5047 const struct c_declarator *decl = declarator;
5049 first_non_attr_kind = cdk_attrs;
5059 funcdef_syntax = (decl->kind == cdk_function);
5060 decl = decl->declarator;
5061 if (first_non_attr_kind == cdk_attrs)
5062 first_non_attr_kind = decl->kind;
5066 decl = decl->declarator;
5073 if (first_non_attr_kind == cdk_attrs)
5074 first_non_attr_kind = decl->kind;
5083 gcc_assert (decl_context == PARM
5084 || decl_context == TYPENAME
5085 || (decl_context == FIELD
5086 && declarator->kind == cdk_id));
5087 gcc_assert (!initialized);
5091 /* A function definition's declarator must have the form of
5092 a function declarator. */
5094 if (funcdef_flag && !funcdef_syntax)
5097 /* If this looks like a function definition, make it one,
5098 even if it occurs where parms are expected.
5099 Then store_parm_decls will reject it and not use it as a parm. */
5100 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
5101 decl_context = PARM;
5103 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
5104 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
5106 if ((decl_context == NORMAL || decl_context == FIELD)
5107 && current_scope == file_scope
5108 && variably_modified_type_p (type, NULL_TREE))
5111 error_at (loc, "variably modified %qE at file scope", name);
5113 error_at (loc, "variably modified field at file scope");
5114 type = integer_type_node;
5117 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
5119 /* Diagnose defaulting to "int". */
5121 if (declspecs->default_int_p && !in_system_header_at (input_location))
5123 /* Issue a warning if this is an ISO C 99 program or if
5124 -Wreturn-type and this is a function, or if -Wimplicit;
5125 prefer the former warning since it is more explicit. */
5126 if ((warn_implicit_int || warn_return_type || flag_isoc99)
5128 warn_about_return_type = 1;
5132 pedwarn_c99 (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int,
5133 "type defaults to %<int%> in declaration of %qE",
5136 pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int,
5137 "type defaults to %<int%> in type name");
5141 /* Adjust the type if a bit-field is being declared,
5142 -funsigned-bitfields applied and the type is not explicitly
5144 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
5145 && TREE_CODE (type) == INTEGER_TYPE)
5146 type = unsigned_type_for (type);
5148 /* Figure out the type qualifiers for the declaration. There are
5149 two ways a declaration can become qualified. One is something
5150 like `const int i' where the `const' is explicit. Another is
5151 something like `typedef const int CI; CI i' where the type of the
5152 declaration contains the `const'. A third possibility is that
5153 there is a type qualifier on the element type of a typedefed
5154 array type, in which case we should extract that qualifier so
5155 that c_apply_type_quals_to_decl receives the full list of
5156 qualifiers to work with (C90 is not entirely clear about whether
5157 duplicate qualifiers should be diagnosed in this case, but it
5158 seems most appropriate to do so). */
5159 element_type = strip_array_types (type);
5160 constp = declspecs->const_p + TYPE_READONLY (element_type);
5161 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
5162 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
5163 atomicp = declspecs->atomic_p + TYPE_ATOMIC (element_type);
5164 as1 = declspecs->address_space;
5165 as2 = TYPE_ADDR_SPACE (element_type);
5166 address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1;
5168 if (pedantic && !flag_isoc99)
5171 pedwarn (loc, OPT_Wpedantic, "duplicate %<const%>");
5173 pedwarn (loc, OPT_Wpedantic, "duplicate %<restrict%>");
5175 pedwarn (loc, OPT_Wpedantic, "duplicate %<volatile%>");
5177 pedwarn (loc, OPT_Wpedantic, "duplicate %<_Atomic%>");
5181 if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2)
5182 error_at (loc, "conflicting named address spaces (%s vs %s)",
5183 c_addr_space_name (as1), c_addr_space_name (as2));
5185 if ((TREE_CODE (type) == ARRAY_TYPE
5186 || first_non_attr_kind == cdk_array)
5187 && TYPE_QUALS (element_type))
5188 type = TYPE_MAIN_VARIANT (type);
5189 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
5190 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
5191 | (volatilep ? TYPE_QUAL_VOLATILE : 0)
5192 | (atomicp ? TYPE_QUAL_ATOMIC : 0)
5193 | ENCODE_QUAL_ADDR_SPACE (address_space));
5195 /* Applying the _Atomic qualifier to an array type (through the use
5196 of typedefs or typeof) must be detected here. If the qualifier
5197 is introduced later, any appearance of applying it to an array is
5198 actually applying it to an element of that array. */
5199 if (atomicp && TREE_CODE (type) == ARRAY_TYPE)
5200 error_at (loc, "%<_Atomic%>-qualified array type");
5202 /* Warn about storage classes that are invalid for certain
5203 kinds of declarations (parameters, typenames, etc.). */
5207 || storage_class == csc_auto
5208 || storage_class == csc_register
5209 || storage_class == csc_typedef))
5211 if (storage_class == csc_auto)
5213 (current_scope == file_scope) ? 0 : OPT_Wpedantic,
5214 "function definition declared %<auto%>");
5215 if (storage_class == csc_register)
5216 error_at (loc, "function definition declared %<register%>");
5217 if (storage_class == csc_typedef)
5218 error_at (loc, "function definition declared %<typedef%>");
5220 error_at (loc, "function definition declared %qs",
5221 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
5223 if (storage_class == csc_auto
5224 || storage_class == csc_register
5225 || storage_class == csc_typedef)
5226 storage_class = csc_none;
5228 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
5230 if (decl_context == PARM && storage_class == csc_register)
5234 switch (decl_context)
5238 error_at (loc, "storage class specified for structure "
5241 error_at (loc, "storage class specified for structure field");
5245 error_at (loc, "storage class specified for parameter %qE",
5248 error_at (loc, "storage class specified for unnamed parameter");
5251 error_at (loc, "storage class specified for typename");
5254 storage_class = csc_none;
5258 else if (storage_class == csc_extern
5262 /* 'extern' with initialization is invalid if not at file scope. */
5263 if (current_scope == file_scope)
5265 /* It is fine to have 'extern const' when compiling at C
5266 and C++ intersection. */
5267 if (!(warn_cxx_compat && constp))
5268 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
5272 error_at (loc, "%qE has both %<extern%> and initializer", name);
5274 else if (current_scope == file_scope)
5276 if (storage_class == csc_auto)
5277 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
5279 if (pedantic && storage_class == csc_register)
5280 pedwarn (input_location, OPT_Wpedantic,
5281 "file-scope declaration of %qE specifies %<register%>", name);
5285 if (storage_class == csc_extern && funcdef_flag)
5286 error_at (loc, "nested function %qE declared %<extern%>", name);
5287 else if (threadp && storage_class == csc_none)
5289 error_at (loc, "function-scope %qE implicitly auto and declared "
5291 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
5296 /* Now figure out the structure of the declarator proper.
5297 Descend through it, creating more complex types, until we reach
5298 the declared identifier (or NULL_TREE, in an absolute declarator).
5299 At each stage we maintain an unqualified version of the type
5300 together with any qualifiers that should be applied to it with
5301 c_build_qualified_type; this way, array types including
5302 multidimensional array types are first built up in unqualified
5303 form and then the qualified form is created with
5304 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5306 while (declarator && declarator->kind != cdk_id)
5308 if (type == error_mark_node)
5310 declarator = declarator->declarator;
5314 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5315 a cdk_pointer (for *...),
5316 a cdk_function (for ...(...)),
5317 a cdk_attrs (for nested attributes),
5318 or a cdk_id (for the name being declared
5319 or the place in an absolute declarator
5320 where the name was omitted).
5321 For the last case, we have just exited the loop.
5323 At this point, TYPE is the type of elements of an array,
5324 or for a function to return, or for a pointer to point to.
5325 After this sequence of ifs, TYPE is the type of the
5326 array or function or pointer, and DECLARATOR has had its
5327 outermost layer removed. */
5329 if (array_ptr_quals != TYPE_UNQUALIFIED
5330 || array_ptr_attrs != NULL_TREE
5331 || array_parm_static)
5333 /* Only the innermost declarator (making a parameter be of
5334 array type which is converted to pointer type)
5335 may have static or type qualifiers. */
5336 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5337 array_ptr_quals = TYPE_UNQUALIFIED;
5338 array_ptr_attrs = NULL_TREE;
5339 array_parm_static = 0;
5342 switch (declarator->kind)
5346 /* A declarator with embedded attributes. */
5347 tree attrs = declarator->u.attrs;
5348 const struct c_declarator *inner_decl;
5350 declarator = declarator->declarator;
5351 inner_decl = declarator;
5352 while (inner_decl->kind == cdk_attrs)
5353 inner_decl = inner_decl->declarator;
5354 if (inner_decl->kind == cdk_id)
5355 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
5356 else if (inner_decl->kind == cdk_function)
5357 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
5358 else if (inner_decl->kind == cdk_array)
5359 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
5360 returned_attrs = decl_attributes (&type,
5361 chainon (returned_attrs, attrs),
5367 tree itype = NULL_TREE;
5368 tree size = declarator->u.array.dimen;
5369 /* The index is a signed object `sizetype' bits wide. */
5370 tree index_type = c_common_signed_type (sizetype);
5372 array_ptr_quals = declarator->u.array.quals;
5373 array_ptr_attrs = declarator->u.array.attrs;
5374 array_parm_static = declarator->u.array.static_p;
5375 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
5377 declarator = declarator->declarator;
5379 /* Check for some types that there cannot be arrays of. */
5381 if (VOID_TYPE_P (type))
5384 error_at (loc, "declaration of %qE as array of voids", name);
5386 error_at (loc, "declaration of type name as array of voids");
5387 type = error_mark_node;
5390 if (TREE_CODE (type) == FUNCTION_TYPE)
5393 error_at (loc, "declaration of %qE as array of functions",
5396 error_at (loc, "declaration of type name as array of "
5398 type = error_mark_node;
5401 if (pedantic && !in_system_header_at (input_location)
5402 && flexible_array_type_p (type))
5403 pedwarn (loc, OPT_Wpedantic,
5404 "invalid use of structure with flexible array member");
5406 if (size == error_mark_node)
5407 type = error_mark_node;
5409 if (type == error_mark_node)
5412 /* If size was specified, set ITYPE to a range-type for
5413 that size. Otherwise, ITYPE remains null. finish_decl
5414 may figure it out from an initial value. */
5418 bool size_maybe_const = true;
5419 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
5420 && !TREE_OVERFLOW (size));
5421 bool this_size_varies = false;
5423 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5425 STRIP_TYPE_NOPS (size);
5427 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
5430 error_at (loc, "size of array %qE has non-integer type",
5434 "size of unnamed array has non-integer type");
5435 size = integer_one_node;
5438 size = c_fully_fold (size, false, &size_maybe_const);
5440 if (pedantic && size_maybe_const && integer_zerop (size))
5443 pedwarn (loc, OPT_Wpedantic,
5444 "ISO C forbids zero-size array %qE", name);
5446 pedwarn (loc, OPT_Wpedantic,
5447 "ISO C forbids zero-size array");
5450 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
5452 constant_expression_warning (size);
5453 if (tree_int_cst_sgn (size) < 0)
5456 error_at (loc, "size of array %qE is negative", name);
5458 error_at (loc, "size of unnamed array is negative");
5459 size = integer_one_node;
5461 /* Handle a size folded to an integer constant but
5462 not an integer constant expression. */
5463 if (!size_int_const)
5465 /* If this is a file scope declaration of an
5466 ordinary identifier, this is invalid code;
5467 diagnosing it here and not subsequently
5468 treating the type as variable-length avoids
5469 more confusing diagnostics later. */
5470 if ((decl_context == NORMAL || decl_context == FIELD)
5471 && current_scope == file_scope)
5472 pedwarn (input_location, 0,
5473 "variably modified %qE at file scope",
5476 this_size_varies = size_varies = true;
5477 warn_variable_length_array (name, size);
5480 else if ((decl_context == NORMAL || decl_context == FIELD)
5481 && current_scope == file_scope)
5483 error_at (loc, "variably modified %qE at file scope", name);
5484 size = integer_one_node;
5488 /* Make sure the array size remains visibly
5489 nonconstant even if it is (eg) a const variable
5490 with known value. */
5491 this_size_varies = size_varies = true;
5492 warn_variable_length_array (name, size);
5493 if (flag_sanitize & SANITIZE_VLA
5494 && decl_context == NORMAL)
5496 /* Evaluate the array size only once. */
5497 size = c_save_expr (size);
5498 size = c_fully_fold (size, false, NULL);
5499 size = fold_build2 (COMPOUND_EXPR, TREE_TYPE (size),
5500 ubsan_instrument_vla (loc, size),
5505 if (integer_zerop (size) && !this_size_varies)
5507 /* A zero-length array cannot be represented with
5508 an unsigned index type, which is what we'll
5509 get with build_index_type. Create an
5510 open-ended range instead. */
5511 itype = build_range_type (sizetype, size, NULL_TREE);
5515 /* Arrange for the SAVE_EXPR on the inside of the
5516 MINUS_EXPR, which allows the -1 to get folded
5517 with the +1 that happens when building TYPE_SIZE. */
5519 size = save_expr (size);
5520 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
5521 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5522 integer_zero_node, size);
5524 /* Compute the maximum valid index, that is, size
5525 - 1. Do the calculation in index_type, so that
5526 if it is a variable the computations will be
5527 done in the proper mode. */
5528 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
5529 convert (index_type, size),
5530 convert (index_type,
5533 /* The above overflows when size does not fit
5535 ??? While a size of INT_MAX+1 technically shouldn't
5536 cause an overflow (because we subtract 1), handling
5537 this case seems like an unnecessary complication. */
5538 if (TREE_CODE (size) == INTEGER_CST
5539 && !int_fits_type_p (size, index_type))
5542 error_at (loc, "size of array %qE is too large",
5545 error_at (loc, "size of unnamed array is too large");
5546 type = error_mark_node;
5550 itype = build_index_type (itype);
5552 if (this_size_varies)
5555 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5559 *expr_const_operands &= size_maybe_const;
5562 else if (decl_context == FIELD)
5564 bool flexible_array_member = false;
5565 if (array_parm_vla_unspec_p)
5566 /* Field names can in fact have function prototype
5567 scope so [*] is disallowed here through making
5568 the field variably modified, not through being
5569 something other than a declaration with function
5574 const struct c_declarator *t = declarator;
5575 while (t->kind == cdk_attrs)
5577 flexible_array_member = (t->kind == cdk_id);
5579 if (flexible_array_member
5580 && pedantic && !flag_isoc99
5581 && !in_system_header_at (input_location))
5582 pedwarn (loc, OPT_Wpedantic,
5583 "ISO C90 does not support flexible array members");
5585 /* ISO C99 Flexible array members are effectively
5586 identical to GCC's zero-length array extension. */
5587 if (flexible_array_member || array_parm_vla_unspec_p)
5588 itype = build_range_type (sizetype, size_zero_node,
5591 else if (decl_context == PARM)
5593 if (array_parm_vla_unspec_p)
5595 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
5599 else if (decl_context == TYPENAME)
5601 if (array_parm_vla_unspec_p)
5604 warning (0, "%<[*]%> not in a declaration");
5605 /* We use this to avoid messing up with incomplete
5606 array types of the same type, that would
5607 otherwise be modified below. */
5608 itype = build_range_type (sizetype, size_zero_node,
5614 /* Complain about arrays of incomplete types. */
5615 if (!COMPLETE_TYPE_P (type))
5617 error_at (loc, "array type has incomplete element type");
5618 type = error_mark_node;
5621 /* When itype is NULL, a shared incomplete array type is
5622 returned for all array of a given type. Elsewhere we
5623 make sure we don't complete that type before copying
5624 it, but here we want to make sure we don't ever
5625 modify the shared type, so we gcc_assert (itype)
5628 addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals);
5629 if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type))
5630 type = build_qualified_type (type,
5631 ENCODE_QUAL_ADDR_SPACE (as));
5633 type = build_array_type (type, itype);
5636 if (type != error_mark_node)
5640 /* It is ok to modify type here even if itype is
5641 NULL: if size_varies, we're in a
5642 multi-dimensional array and the inner type has
5643 variable size, so the enclosing shared array type
5645 if (size && TREE_CODE (size) == INTEGER_CST)
5647 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5648 C_TYPE_VARIABLE_SIZE (type) = 1;
5651 /* The GCC extension for zero-length arrays differs from
5652 ISO flexible array members in that sizeof yields
5654 if (size && integer_zerop (size))
5657 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5658 TYPE_SIZE (type) = bitsize_zero_node;
5659 TYPE_SIZE_UNIT (type) = size_zero_node;
5660 SET_TYPE_STRUCTURAL_EQUALITY (type);
5662 if (array_parm_vla_unspec_p)
5665 /* The type is complete. C99 6.7.5.2p4 */
5666 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5667 TYPE_SIZE (type) = bitsize_zero_node;
5668 TYPE_SIZE_UNIT (type) = size_zero_node;
5669 SET_TYPE_STRUCTURAL_EQUALITY (type);
5673 if (decl_context != PARM
5674 && (array_ptr_quals != TYPE_UNQUALIFIED
5675 || array_ptr_attrs != NULL_TREE
5676 || array_parm_static))
5678 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5679 array_ptr_quals = TYPE_UNQUALIFIED;
5680 array_ptr_attrs = NULL_TREE;
5681 array_parm_static = 0;
5687 /* Say it's a definition only for the declarator closest
5688 to the identifier, apart possibly from some
5690 bool really_funcdef = false;
5694 const struct c_declarator *t = declarator->declarator;
5695 while (t->kind == cdk_attrs)
5697 really_funcdef = (t->kind == cdk_id);
5700 /* Declaring a function type. Make sure we have a valid
5701 type for the function to return. */
5702 if (type == error_mark_node)
5705 size_varies = false;
5707 /* Warn about some types functions can't return. */
5708 if (TREE_CODE (type) == FUNCTION_TYPE)
5711 error_at (loc, "%qE declared as function returning a "
5714 error_at (loc, "type name declared as function "
5715 "returning a function");
5716 type = integer_type_node;
5718 if (TREE_CODE (type) == ARRAY_TYPE)
5721 error_at (loc, "%qE declared as function returning an array",
5724 error_at (loc, "type name declared as function returning "
5726 type = integer_type_node;
5728 errmsg = targetm.invalid_return_type (type);
5732 type = integer_type_node;
5735 /* Construct the function type and go to the next
5736 inner layer of declarator. */
5737 arg_info = declarator->u.arg_info;
5738 arg_types = grokparms (arg_info, really_funcdef);
5740 /* Type qualifiers before the return type of the function
5741 qualify the return type, not the function type. */
5744 /* Type qualifiers on a function return type are
5745 normally permitted by the standard but have no
5746 effect, so give a warning at -Wreturn-type.
5747 Qualifiers on a void return type are banned on
5748 function definitions in ISO C; GCC used to used
5749 them for noreturn functions. */
5750 if (VOID_TYPE_P (type) && really_funcdef)
5752 "function definition has qualified void return type");
5754 warning_at (loc, OPT_Wignored_qualifiers,
5755 "type qualifiers ignored on function return type");
5757 type = c_build_qualified_type (type, type_quals);
5759 type_quals = TYPE_UNQUALIFIED;
5761 type = build_function_type (type, arg_types);
5762 declarator = declarator->declarator;
5764 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5765 the formal parameter list of this FUNCTION_TYPE to point to
5766 the FUNCTION_TYPE node itself. */
5771 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
5772 TYPE_CONTEXT (tag->type) = type;
5778 /* Merge any constancy or volatility into the target type
5780 if ((type_quals & TYPE_QUAL_ATOMIC)
5781 && TREE_CODE (type) == FUNCTION_TYPE)
5784 "%<_Atomic%>-qualified function type");
5785 type_quals &= ~TYPE_QUAL_ATOMIC;
5787 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5789 pedwarn (loc, OPT_Wpedantic,
5790 "ISO C forbids qualified function types");
5792 type = c_build_qualified_type (type, type_quals);
5793 size_varies = false;
5795 /* When the pointed-to type involves components of variable size,
5796 care must be taken to ensure that the size evaluation code is
5797 emitted early enough to dominate all the possible later uses
5798 and late enough for the variables on which it depends to have
5801 This is expected to happen automatically when the pointed-to
5802 type has a name/declaration of it's own, but special attention
5803 is required if the type is anonymous.
5805 We handle the NORMAL and FIELD contexts here by attaching an
5806 artificial TYPE_DECL to such pointed-to type. This forces the
5807 sizes evaluation at a safe point and ensures it is not deferred
5808 until e.g. within a deeper conditional context.
5810 We expect nothing to be needed here for PARM or TYPENAME.
5811 Pushing a TYPE_DECL at this point for TYPENAME would actually
5812 be incorrect, as we might be in the middle of an expression
5813 with side effects on the pointed-to type size "arguments" prior
5814 to the pointer declaration point and the fake TYPE_DECL in the
5815 enclosing context would force the size evaluation prior to the
5818 if (!TYPE_NAME (type)
5819 && (decl_context == NORMAL || decl_context == FIELD)
5820 && variably_modified_type_p (type, NULL_TREE))
5822 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
5823 DECL_ARTIFICIAL (decl) = 1;
5825 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
5826 TYPE_NAME (type) = decl;
5829 type = c_build_pointer_type (type);
5831 /* Process type qualifiers (such as const or volatile)
5832 that were given inside the `*'. */
5833 type_quals = declarator->u.pointer_quals;
5835 declarator = declarator->declarator;
5842 *decl_attrs = chainon (returned_attrs, *decl_attrs);
5844 /* Now TYPE has the actual type, apart from any qualifiers in
5847 /* Warn about address space used for things other than static memory or
5849 address_space = DECODE_QUAL_ADDR_SPACE (type_quals);
5850 if (!ADDR_SPACE_GENERIC_P (address_space))
5852 if (decl_context == NORMAL)
5854 switch (storage_class)
5857 error ("%qs combined with %<auto%> qualifier for %qE",
5858 c_addr_space_name (address_space), name);
5861 error ("%qs combined with %<register%> qualifier for %qE",
5862 c_addr_space_name (address_space), name);
5865 if (current_function_scope)
5867 error ("%qs specified for auto variable %qE",
5868 c_addr_space_name (address_space), name);
5880 else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE)
5883 error ("%qs specified for parameter %qE",
5884 c_addr_space_name (address_space), name);
5886 error ("%qs specified for unnamed parameter",
5887 c_addr_space_name (address_space));
5889 else if (decl_context == FIELD)
5892 error ("%qs specified for structure field %qE",
5893 c_addr_space_name (address_space), name);
5895 error ("%qs specified for structure field",
5896 c_addr_space_name (address_space));
5900 /* Check the type and width of a bit-field. */
5903 check_bitfield_type_and_width (&type, width, name);
5904 /* C11 makes it implementation-defined (6.7.2.1#5) whether
5905 atomic types are permitted for bit-fields; we have no code to
5906 make bit-field accesses atomic, so disallow them. */
5907 if (type_quals & TYPE_QUAL_ATOMIC)
5910 error ("bit-field %qE has atomic type", name);
5912 error ("bit-field has atomic type");
5913 type_quals &= ~TYPE_QUAL_ATOMIC;
5917 /* Reject invalid uses of _Alignas. */
5918 if (declspecs->alignas_p)
5920 if (storage_class == csc_typedef)
5921 error_at (loc, "alignment specified for typedef %qE", name);
5922 else if (storage_class == csc_register)
5923 error_at (loc, "alignment specified for %<register%> object %qE",
5925 else if (decl_context == PARM)
5928 error_at (loc, "alignment specified for parameter %qE", name);
5930 error_at (loc, "alignment specified for unnamed parameter");
5935 error_at (loc, "alignment specified for bit-field %qE", name);
5937 error_at (loc, "alignment specified for unnamed bit-field");
5939 else if (TREE_CODE (type) == FUNCTION_TYPE)
5940 error_at (loc, "alignment specified for function %qE", name);
5941 else if (declspecs->align_log != -1)
5943 alignas_align = 1U << declspecs->align_log;
5944 if (alignas_align < min_align_of_type (type))
5947 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
5948 "alignment of %qE", name);
5950 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
5951 "alignment of unnamed field");
5957 /* Did array size calculations overflow or does the array cover more
5958 than half of the address-space? */
5959 if (TREE_CODE (type) == ARRAY_TYPE
5960 && COMPLETE_TYPE_P (type)
5961 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
5962 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type)))
5965 error_at (loc, "size of array %qE is too large", name);
5967 error_at (loc, "size of unnamed array is too large");
5968 /* If we proceed with the array type as it is, we'll eventually
5969 crash in tree_to_[su]hwi(). */
5970 type = error_mark_node;
5973 /* If this is declaring a typedef name, return a TYPE_DECL. */
5975 if (storage_class == csc_typedef)
5978 if ((type_quals & TYPE_QUAL_ATOMIC)
5979 && TREE_CODE (type) == FUNCTION_TYPE)
5982 "%<_Atomic%>-qualified function type");
5983 type_quals &= ~TYPE_QUAL_ATOMIC;
5985 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5987 pedwarn (loc, OPT_Wpedantic,
5988 "ISO C forbids qualified function types");
5990 type = c_build_qualified_type (type, type_quals);
5991 decl = build_decl (declarator->id_loc,
5992 TYPE_DECL, declarator->u.id, type);
5993 if (declspecs->explicit_signed_p)
5994 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5995 if (declspecs->inline_p)
5996 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
5997 if (declspecs->noreturn_p)
5998 pedwarn (loc, 0,"typedef %q+D declared %<_Noreturn%>", decl);
6000 if (warn_cxx_compat && declarator->u.id != NULL_TREE)
6002 struct c_binding *b = I_TAG_BINDING (declarator->u.id);
6005 && b->decl != NULL_TREE
6006 && (B_IN_CURRENT_SCOPE (b)
6007 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
6008 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
6010 warning_at (declarator->id_loc, OPT_Wc___compat,
6011 ("using %qD as both a typedef and a tag is "
6014 if (b->locus != UNKNOWN_LOCATION)
6015 inform (b->locus, "originally defined here");
6022 /* If this is a type name (such as, in a cast or sizeof),
6023 compute the type and return it now. */
6025 if (decl_context == TYPENAME)
6027 /* Note that the grammar rejects storage classes in typenames
6029 gcc_assert (storage_class == csc_none && !threadp
6030 && !declspecs->inline_p && !declspecs->noreturn_p);
6031 if ((type_quals & TYPE_QUAL_ATOMIC)
6032 && TREE_CODE (type) == FUNCTION_TYPE)
6035 "%<_Atomic%>-qualified function type");
6036 type_quals &= ~TYPE_QUAL_ATOMIC;
6038 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
6040 pedwarn (loc, OPT_Wpedantic,
6041 "ISO C forbids const or volatile function types");
6043 type = c_build_qualified_type (type, type_quals);
6047 if (pedantic && decl_context == FIELD
6048 && variably_modified_type_p (type, NULL_TREE))
6051 pedwarn (loc, OPT_Wpedantic, "a member of a structure or union cannot "
6052 "have a variably modified type");
6055 /* Aside from typedefs and type names (handle above),
6056 `void' at top level (not within pointer)
6057 is allowed only in public variables.
6058 We don't complain about parms either, but that is because
6059 a better error message can be made later. */
6061 if (VOID_TYPE_P (type) && decl_context != PARM
6062 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
6063 && (storage_class == csc_extern
6064 || (current_scope == file_scope
6065 && !(storage_class == csc_static
6066 || storage_class == csc_register)))))
6068 error_at (loc, "variable or field %qE declared void", name);
6069 type = integer_type_node;
6072 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6073 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6078 if (decl_context == PARM)
6082 /* A parameter declared as an array of T is really a pointer to T.
6083 One declared as a function is really a pointer to a function. */
6085 if (TREE_CODE (type) == ARRAY_TYPE)
6087 /* Transfer const-ness of array into that of type pointed to. */
6088 type = TREE_TYPE (type);
6090 type = c_build_qualified_type (type, type_quals);
6091 type = c_build_pointer_type (type);
6092 type_quals = array_ptr_quals;
6094 type = c_build_qualified_type (type, type_quals);
6096 /* We don't yet implement attributes in this context. */
6097 if (array_ptr_attrs != NULL_TREE)
6098 warning_at (loc, OPT_Wattributes,
6099 "attributes in parameter array declarator ignored");
6101 size_varies = false;
6103 else if (TREE_CODE (type) == FUNCTION_TYPE)
6105 if (type_quals & TYPE_QUAL_ATOMIC)
6108 "%<_Atomic%>-qualified function type");
6109 type_quals &= ~TYPE_QUAL_ATOMIC;
6111 else if (type_quals)
6112 pedwarn (loc, OPT_Wpedantic,
6113 "ISO C forbids qualified function types");
6115 type = c_build_qualified_type (type, type_quals);
6116 type = c_build_pointer_type (type);
6117 type_quals = TYPE_UNQUALIFIED;
6119 else if (type_quals)
6120 type = c_build_qualified_type (type, type_quals);
6122 decl = build_decl (declarator->id_loc,
6123 PARM_DECL, declarator->u.id, type);
6125 C_DECL_VARIABLE_SIZE (decl) = 1;
6127 /* Compute the type actually passed in the parmlist,
6128 for the case where there is no prototype.
6129 (For example, shorts and chars are passed as ints.)
6130 When there is a prototype, this is overridden later. */
6132 if (type == error_mark_node)
6133 promoted_type = type;
6135 promoted_type = c_type_promotes_to (type);
6137 DECL_ARG_TYPE (decl) = promoted_type;
6138 if (declspecs->inline_p)
6139 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
6140 if (declspecs->noreturn_p)
6141 pedwarn (loc, 0, "parameter %q+D declared %<_Noreturn%>", decl);
6143 else if (decl_context == FIELD)
6145 /* Note that the grammar rejects storage classes in typenames
6147 gcc_assert (storage_class == csc_none && !threadp
6148 && !declspecs->inline_p && !declspecs->noreturn_p);
6150 /* Structure field. It may not be a function. */
6152 if (TREE_CODE (type) == FUNCTION_TYPE)
6154 error_at (loc, "field %qE declared as a function", name);
6155 type = build_pointer_type (type);
6157 else if (TREE_CODE (type) != ERROR_MARK
6158 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
6161 error_at (loc, "field %qE has incomplete type", name);
6163 error_at (loc, "unnamed field has incomplete type");
6164 type = error_mark_node;
6166 type = c_build_qualified_type (type, type_quals);
6167 decl = build_decl (declarator->id_loc,
6168 FIELD_DECL, declarator->u.id, type);
6169 DECL_NONADDRESSABLE_P (decl) = bitfield;
6170 if (bitfield && !declarator->u.id)
6171 TREE_NO_WARNING (decl) = 1;
6174 C_DECL_VARIABLE_SIZE (decl) = 1;
6176 else if (TREE_CODE (type) == FUNCTION_TYPE)
6178 if (storage_class == csc_register || threadp)
6180 error_at (loc, "invalid storage class for function %qE", name);
6182 else if (current_scope != file_scope)
6184 /* Function declaration not at file scope. Storage
6185 classes other than `extern' are not allowed, C99
6186 6.7.1p5, and `extern' makes no difference. However,
6187 GCC allows 'auto', perhaps with 'inline', to support
6188 nested functions. */
6189 if (storage_class == csc_auto)
6190 pedwarn (loc, OPT_Wpedantic,
6191 "invalid storage class for function %qE", name);
6192 else if (storage_class == csc_static)
6194 error_at (loc, "invalid storage class for function %qE", name);
6196 storage_class = declspecs->storage_class = csc_none;
6202 decl = build_decl (declarator->id_loc,
6203 FUNCTION_DECL, declarator->u.id, type);
6204 decl = build_decl_attribute_variant (decl, decl_attr);
6206 if (type_quals & TYPE_QUAL_ATOMIC)
6209 "%<_Atomic%>-qualified function type");
6210 type_quals &= ~TYPE_QUAL_ATOMIC;
6212 else if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
6213 pedwarn (loc, OPT_Wpedantic,
6214 "ISO C forbids qualified function types");
6216 /* Every function declaration is an external reference
6217 (DECL_EXTERNAL) except for those which are not at file
6218 scope and are explicitly declared "auto". This is
6219 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6220 GCC to signify a forward declaration of a nested function. */
6221 if (storage_class == csc_auto && current_scope != file_scope)
6222 DECL_EXTERNAL (decl) = 0;
6223 /* In C99, a function which is declared 'inline' with 'extern'
6224 is not an external reference (which is confusing). It
6225 means that the later definition of the function must be output
6226 in this file, C99 6.7.4p6. In GNU C89, a function declared
6227 'extern inline' is an external reference. */
6228 else if (declspecs->inline_p && storage_class != csc_static)
6229 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
6230 == flag_gnu89_inline);
6232 DECL_EXTERNAL (decl) = !initialized;
6234 /* Record absence of global scope for `static' or `auto'. */
6236 = !(storage_class == csc_static || storage_class == csc_auto);
6238 /* For a function definition, record the argument information
6239 block where store_parm_decls will look for it. */
6241 current_function_arg_info = arg_info;
6243 if (declspecs->default_int_p)
6244 C_FUNCTION_IMPLICIT_INT (decl) = 1;
6246 /* Record presence of `inline' and `_Noreturn', if it is
6248 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
6250 if (declspecs->inline_p)
6251 pedwarn (loc, 0, "cannot inline function %<main%>");
6252 if (declspecs->noreturn_p)
6253 pedwarn (loc, 0, "%<main%> declared %<_Noreturn%>");
6257 if (declspecs->inline_p)
6258 /* Record that the function is declared `inline'. */
6259 DECL_DECLARED_INLINE_P (decl) = 1;
6260 if (declspecs->noreturn_p)
6265 pedwarn (loc, OPT_Wpedantic,
6266 "ISO C99 does not support %<_Noreturn%>");
6268 pedwarn (loc, OPT_Wpedantic,
6269 "ISO C90 does not support %<_Noreturn%>");
6271 TREE_THIS_VOLATILE (decl) = 1;
6277 /* It's a variable. */
6278 /* An uninitialized decl with `extern' is a reference. */
6279 int extern_ref = !initialized && storage_class == csc_extern;
6281 type = c_build_qualified_type (type, type_quals);
6283 /* C99 6.2.2p7: It is invalid (compile-time undefined
6284 behavior) to create an 'extern' declaration for a
6285 variable if there is a global declaration that is
6286 'static' and the global declaration is not visible.
6287 (If the static declaration _is_ currently visible,
6288 the 'extern' declaration is taken to refer to that decl.) */
6289 if (extern_ref && current_scope != file_scope)
6291 tree global_decl = identifier_global_value (declarator->u.id);
6292 tree visible_decl = lookup_name (declarator->u.id);
6295 && global_decl != visible_decl
6296 && TREE_CODE (global_decl) == VAR_DECL
6297 && !TREE_PUBLIC (global_decl))
6298 error_at (loc, "variable previously declared %<static%> "
6299 "redeclared %<extern%>");
6302 decl = build_decl (declarator->id_loc,
6303 VAR_DECL, declarator->u.id, type);
6305 C_DECL_VARIABLE_SIZE (decl) = 1;
6307 if (declspecs->inline_p)
6308 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
6309 if (declspecs->noreturn_p)
6310 pedwarn (loc, 0, "variable %q+D declared %<_Noreturn%>", decl);
6312 /* At file scope, an initialized extern declaration may follow
6313 a static declaration. In that case, DECL_EXTERNAL will be
6314 reset later in start_decl. */
6315 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
6317 /* At file scope, the presence of a `static' or `register' storage
6318 class specifier, or the absence of all storage class specifiers
6319 makes this declaration a definition (perhaps tentative). Also,
6320 the absence of `static' makes it public. */
6321 if (current_scope == file_scope)
6323 TREE_PUBLIC (decl) = storage_class != csc_static;
6324 TREE_STATIC (decl) = !extern_ref;
6326 /* Not at file scope, only `static' makes a static definition. */
6329 TREE_STATIC (decl) = (storage_class == csc_static);
6330 TREE_PUBLIC (decl) = extern_ref;
6334 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6337 if ((storage_class == csc_extern
6338 || (storage_class == csc_none
6339 && TREE_CODE (type) == FUNCTION_TYPE
6341 && variably_modified_type_p (type, NULL_TREE))
6344 if (TREE_CODE (type) == FUNCTION_TYPE)
6345 error_at (loc, "non-nested function with variably modified type");
6347 error_at (loc, "object with variably modified type must have "
6351 /* Record `register' declaration for warnings on &
6352 and in case doing stupid register allocation. */
6354 if (storage_class == csc_register)
6356 C_DECL_REGISTER (decl) = 1;
6357 DECL_REGISTER (decl) = 1;
6360 /* Record constancy and volatility. */
6361 c_apply_type_quals_to_decl (type_quals, decl);
6363 /* Apply _Alignas specifiers. */
6366 DECL_ALIGN (decl) = alignas_align * BITS_PER_UNIT;
6367 DECL_USER_ALIGN (decl) = 1;
6370 /* If a type has volatile components, it should be stored in memory.
6371 Otherwise, the fact that those components are volatile
6372 will be ignored, and would even crash the compiler.
6373 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6374 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
6375 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
6376 || TREE_CODE (decl) == RESULT_DECL))
6378 /* It is not an error for a structure with volatile fields to
6379 be declared register, but reset DECL_REGISTER since it
6380 cannot actually go in a register. */
6381 int was_reg = C_DECL_REGISTER (decl);
6382 C_DECL_REGISTER (decl) = 0;
6383 DECL_REGISTER (decl) = 0;
6384 c_mark_addressable (decl);
6385 C_DECL_REGISTER (decl) = was_reg;
6388 /* This is the earliest point at which we might know the assembler
6389 name of a variable. Thus, if it's known before this, die horribly. */
6390 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
6393 && TREE_CODE (decl) == VAR_DECL
6394 && TREE_PUBLIC (decl)
6395 && TREE_STATIC (decl)
6396 && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
6397 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
6398 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
6399 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
6400 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
6401 ("non-local variable %qD with anonymous type is "
6402 "questionable in C++"),
6409 /* Decode the parameter-list info for a function type or function definition.
6410 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6411 if there is an identifier list instead of a parameter decl list).
6412 These two functions are separate because when a function returns
6413 or receives functions then each is called multiple times but the order
6414 of calls is different. The last call to `grokparms' is always the one
6415 that contains the formal parameter names of a function definition.
6417 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6419 FUNCDEF_FLAG is true for a function definition, false for
6420 a mere declaration. A nonempty identifier-list gets an error message
6421 when FUNCDEF_FLAG is false. */
6424 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
6426 tree arg_types = arg_info->types;
6428 if (funcdef_flag && arg_info->had_vla_unspec)
6430 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6432 error ("%<[*]%> not allowed in other than function prototype scope");
6435 if (arg_types == 0 && !funcdef_flag
6436 && !in_system_header_at (input_location))
6437 warning (OPT_Wstrict_prototypes,
6438 "function declaration isn%'t a prototype");
6440 if (arg_types == error_mark_node)
6441 return 0; /* don't set TYPE_ARG_TYPES in this case */
6443 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
6447 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
6448 arg_info->parms = NULL_TREE;
6451 arg_info->parms = arg_info->types;
6453 arg_info->types = 0;
6458 tree parm, type, typelt;
6459 unsigned int parmno;
6462 /* If there is a parameter of incomplete type in a definition,
6463 this is an error. In a declaration this is valid, and a
6464 struct or union type may be completed later, before any calls
6465 or definition of the function. In the case where the tag was
6466 first declared within the parameter list, a warning has
6467 already been given. If a parameter has void type, then
6468 however the function cannot be defined or called, so
6471 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
6473 parm = DECL_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
6475 type = TREE_VALUE (typelt);
6476 if (type == error_mark_node)
6479 if (!COMPLETE_TYPE_P (type))
6483 if (DECL_NAME (parm))
6484 error_at (input_location,
6485 "parameter %u (%q+D) has incomplete type",
6488 error_at (DECL_SOURCE_LOCATION (parm),
6489 "parameter %u has incomplete type",
6492 TREE_VALUE (typelt) = error_mark_node;
6493 TREE_TYPE (parm) = error_mark_node;
6494 arg_types = NULL_TREE;
6496 else if (VOID_TYPE_P (type))
6498 if (DECL_NAME (parm))
6499 warning_at (input_location, 0,
6500 "parameter %u (%q+D) has void type",
6503 warning_at (DECL_SOURCE_LOCATION (parm), 0,
6504 "parameter %u has void type",
6509 errmsg = targetm.invalid_parameter_type (type);
6513 TREE_VALUE (typelt) = error_mark_node;
6514 TREE_TYPE (parm) = error_mark_node;
6515 arg_types = NULL_TREE;
6518 if (DECL_NAME (parm) && TREE_USED (parm))
6519 warn_if_shadowing (parm);
6525 /* Allocate and initialize a c_arg_info structure from the parser's
6529 build_arg_info (void)
6531 struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info);
6532 ret->parms = NULL_TREE;
6534 ret->types = NULL_TREE;
6535 ret->others = NULL_TREE;
6536 ret->pending_sizes = NULL;
6537 ret->had_vla_unspec = 0;
6541 /* Take apart the current scope and return a c_arg_info structure with
6542 info on a parameter list just parsed.
6544 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6546 ELLIPSIS being true means the argument list ended in '...' so don't
6547 append a sentinel (void_list_node) to the end of the type-list.
6549 EXPR is NULL or an expression that needs to be evaluated for the
6550 side effects of array size expressions in the parameters. */
6553 get_parm_info (bool ellipsis, tree expr)
6555 struct c_binding *b = current_scope->bindings;
6556 struct c_arg_info *arg_info = build_arg_info ();
6559 vec<c_arg_tag, va_gc> *tags = NULL;
6563 static bool explained_incomplete_types = false;
6564 bool gave_void_only_once_err = false;
6566 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
6568 /* The bindings in this scope must not get put into a block.
6569 We will take care of deleting the binding nodes. */
6570 current_scope->bindings = 0;
6572 /* This function is only called if there was *something* on the
6576 /* A parameter list consisting solely of 'void' indicates that the
6577 function takes no arguments. But if the 'void' is qualified
6578 (by 'const' or 'volatile'), or has a storage class specifier
6579 ('register'), then the behavior is undefined; issue an error.
6580 Typedefs for 'void' are OK (see DR#157). */
6581 if (b->prev == 0 /* one binding */
6582 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
6583 && !DECL_NAME (b->decl) /* anonymous */
6584 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
6586 if (TYPE_QUALS (TREE_TYPE (b->decl)) != TYPE_UNQUALIFIED
6587 || C_DECL_REGISTER (b->decl))
6588 error ("%<void%> as only parameter may not be qualified");
6590 /* There cannot be an ellipsis. */
6592 error ("%<void%> must be the only parameter");
6594 arg_info->types = void_list_node;
6599 types = void_list_node;
6601 /* Break up the bindings list into parms, tags, types, and others;
6602 apply sanity checks; purge the name-to-decl bindings. */
6605 tree decl = b->decl;
6606 tree type = TREE_TYPE (decl);
6608 const char *keyword;
6610 switch (TREE_CODE (decl))
6615 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6616 I_SYMBOL_BINDING (b->id) = b->shadowed;
6619 /* Check for forward decls that never got their actual decl. */
6620 if (TREE_ASM_WRITTEN (decl))
6621 error ("parameter %q+D has just a forward declaration", decl);
6622 /* Check for (..., void, ...) and issue an error. */
6623 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
6625 if (!gave_void_only_once_err)
6627 error ("%<void%> must be the only parameter");
6628 gave_void_only_once_err = true;
6633 /* Valid parameter, add it to the list. */
6634 DECL_CHAIN (decl) = parms;
6637 /* Since there is a prototype, args are passed in their
6638 declared types. The back end may override this later. */
6639 DECL_ARG_TYPE (decl) = type;
6640 types = tree_cons (0, type, types);
6644 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
6645 case UNION_TYPE: keyword = "union"; goto tag;
6646 case RECORD_TYPE: keyword = "struct"; goto tag;
6648 /* Types may not have tag-names, in which case the type
6649 appears in the bindings list with b->id NULL. */
6652 gcc_assert (I_TAG_BINDING (b->id) == b);
6653 I_TAG_BINDING (b->id) = b->shadowed;
6656 /* Warn about any struct, union or enum tags defined in a
6657 parameter list. The scope of such types is limited to
6658 the parameter list, which is rarely if ever desirable
6659 (it's impossible to call such a function with type-
6660 correct arguments). An anonymous union parm type is
6661 meaningful as a GNU extension, so don't warn for that. */
6662 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
6665 /* The %s will be one of 'struct', 'union', or 'enum'. */
6666 warning (0, "%<%s %E%> declared inside parameter list",
6669 /* The %s will be one of 'struct', 'union', or 'enum'. */
6670 warning (0, "anonymous %s declared inside parameter list",
6673 if (!explained_incomplete_types)
6675 warning (0, "its scope is only this definition or declaration,"
6676 " which is probably not what you want");
6677 explained_incomplete_types = true;
6683 vec_safe_push (tags, tag);
6689 /* CONST_DECLs appear here when we have an embedded enum,
6690 and TYPE_DECLs appear here when we have an embedded struct
6691 or union. No warnings for this - we already warned about the
6692 type itself. FUNCTION_DECLs appear when there is an implicit
6693 function declaration in the parameter list. */
6695 /* When we reinsert this decl in the function body, we need
6696 to reconstruct whether it was marked as nested. */
6697 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6700 DECL_CHAIN (decl) = others;
6705 /* error_mark_node appears here when we have an undeclared
6706 variable. Just throw it away. */
6709 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6710 I_SYMBOL_BINDING (b->id) = b->shadowed;
6714 /* Other things that might be encountered. */
6721 b = free_binding_and_advance (b);
6724 arg_info->parms = parms;
6725 arg_info->tags = tags;
6726 arg_info->types = types;
6727 arg_info->others = others;
6728 arg_info->pending_sizes = expr;
6732 /* Get the struct, enum or union (CODE says which) with tag NAME.
6733 Define the tag as a forward-reference with location LOC if it is
6734 not defined. Return a c_typespec structure for the type
6738 parser_xref_tag (location_t loc, enum tree_code code, tree name)
6740 struct c_typespec ret;
6744 ret.expr = NULL_TREE;
6745 ret.expr_const_operands = true;
6747 /* If a cross reference is requested, look up the type
6748 already defined for this tag and return it. */
6750 ref = lookup_tag (code, name, 0, &refloc);
6751 /* If this is the right type of tag, return what we found.
6752 (This reference will be shadowed by shadow_tag later if appropriate.)
6753 If this is the wrong type of tag, do not return it. If it was the
6754 wrong type in the same scope, we will have had an error
6755 message already; if in a different scope and declaring
6756 a name, pending_xref_error will give an error message; but if in a
6757 different scope and not declaring a name, this tag should
6758 shadow the previous declaration of a different type of tag, and
6759 this would not work properly if we return the reference found.
6760 (For example, with "struct foo" in an outer scope, "union foo;"
6761 must shadow that tag with a new one of union type.) */
6762 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
6763 if (ref && TREE_CODE (ref) == code)
6765 if (C_TYPE_DEFINED_IN_STRUCT (ref)
6766 && loc != UNKNOWN_LOCATION
6772 warning_at (loc, OPT_Wc___compat,
6773 ("enum type defined in struct or union "
6774 "is not visible in C++"));
6775 inform (refloc, "enum type defined here");
6778 warning_at (loc, OPT_Wc___compat,
6779 ("struct defined in struct or union "
6780 "is not visible in C++"));
6781 inform (refloc, "struct defined here");
6784 warning_at (loc, OPT_Wc___compat,
6785 ("union defined in struct or union "
6786 "is not visible in C++"));
6787 inform (refloc, "union defined here");
6798 /* If no such tag is yet defined, create a forward-reference node
6799 and record it as the "definition".
6800 When a real declaration of this type is found,
6801 the forward-reference will be altered into a real type. */
6803 ref = make_node (code);
6804 if (code == ENUMERAL_TYPE)
6806 /* Give the type a default layout like unsigned int
6807 to avoid crashing if it does not get defined. */
6808 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
6809 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
6810 TYPE_USER_ALIGN (ref) = 0;
6811 TYPE_UNSIGNED (ref) = 1;
6812 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
6813 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
6814 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
6817 pushtag (loc, name, ref);
6823 /* Get the struct, enum or union (CODE says which) with tag NAME.
6824 Define the tag as a forward-reference if it is not defined.
6825 Return a tree for the type. */
6828 xref_tag (enum tree_code code, tree name)
6830 return parser_xref_tag (input_location, code, name).spec;
6833 /* Make sure that the tag NAME is defined *in the current scope*
6834 at least as a forward reference.
6835 LOC is the location of the struct's definition.
6836 CODE says which kind of tag NAME ought to be.
6838 This stores the current value of the file static STRUCT_PARSE_INFO
6839 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6840 new c_struct_parse_info structure. The old value of
6841 STRUCT_PARSE_INFO is restored in finish_struct. */
6844 start_struct (location_t loc, enum tree_code code, tree name,
6845 struct c_struct_parse_info **enclosing_struct_parse_info)
6847 /* If there is already a tag defined at this scope
6848 (as a forward reference), just return it. */
6850 tree ref = NULL_TREE;
6851 location_t refloc = UNKNOWN_LOCATION;
6853 if (name != NULL_TREE)
6854 ref = lookup_tag (code, name, 1, &refloc);
6855 if (ref && TREE_CODE (ref) == code)
6857 if (TYPE_SIZE (ref))
6859 if (code == UNION_TYPE)
6860 error_at (loc, "redefinition of %<union %E%>", name);
6862 error_at (loc, "redefinition of %<struct %E%>", name);
6863 if (refloc != UNKNOWN_LOCATION)
6864 inform (refloc, "originally defined here");
6865 /* Don't create structures using a name already in use. */
6868 else if (C_TYPE_BEING_DEFINED (ref))
6870 if (code == UNION_TYPE)
6871 error_at (loc, "nested redefinition of %<union %E%>", name);
6873 error_at (loc, "nested redefinition of %<struct %E%>", name);
6874 /* Don't bother to report "originally defined here" for a
6875 nested redefinition; the original definition should be
6877 /* Don't create structures that contain themselves. */
6882 /* Otherwise create a forward-reference just so the tag is in scope. */
6884 if (ref == NULL_TREE || TREE_CODE (ref) != code)
6886 ref = make_node (code);
6887 pushtag (loc, name, ref);
6890 C_TYPE_BEING_DEFINED (ref) = 1;
6891 TYPE_PACKED (ref) = flag_pack_struct;
6893 *enclosing_struct_parse_info = struct_parse_info;
6894 struct_parse_info = XNEW (struct c_struct_parse_info);
6895 struct_parse_info->struct_types.create (0);
6896 struct_parse_info->fields.create (0);
6897 struct_parse_info->typedefs_seen.create (0);
6899 /* FIXME: This will issue a warning for a use of a type defined
6900 within a statement expr used within sizeof, et. al. This is not
6901 terribly serious as C++ doesn't permit statement exprs within
6903 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
6904 warning_at (loc, OPT_Wc___compat,
6905 "defining type in %qs expression is invalid in C++",
6908 : (in_typeof ? "typeof" : "alignof")));
6913 /* Process the specs, declarator and width (NULL if omitted)
6914 of a structure component, returning a FIELD_DECL node.
6915 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6916 DECL_ATTRS is as for grokdeclarator.
6918 LOC is the location of the structure component.
6920 This is done during the parsing of the struct declaration.
6921 The FIELD_DECL nodes are chained together and the lot of them
6922 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6925 grokfield (location_t loc,
6926 struct c_declarator *declarator, struct c_declspecs *declspecs,
6927 tree width, tree *decl_attrs)
6931 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
6932 && width == NULL_TREE)
6934 /* This is an unnamed decl.
6936 If we have something of the form "union { list } ;" then this
6937 is the anonymous union extension. Similarly for struct.
6939 If this is something of the form "struct foo;", then
6940 If MS or Plan 9 extensions are enabled, this is handled as
6941 an anonymous struct.
6942 Otherwise this is a forward declaration of a structure tag.
6944 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6945 If foo names a structure or union without a tag, then this
6946 is an anonymous struct (this is permitted by C11).
6947 If MS or Plan 9 extensions are enabled and foo names a
6948 structure, then again this is an anonymous struct.
6949 Otherwise this is an error.
6951 Oh what a horrid tangled web we weave. I wonder if MS consciously
6952 took this from Plan 9 or if it was an accident of implementation
6953 that took root before someone noticed the bug... */
6955 tree type = declspecs->type;
6956 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
6957 || TREE_CODE (type) == UNION_TYPE);
6961 && (flag_ms_extensions
6962 || flag_plan9_extensions
6963 || !declspecs->typedef_p))
6965 if (flag_ms_extensions || flag_plan9_extensions)
6967 else if (TYPE_NAME (type) == NULL)
6974 pedwarn (loc, 0, "declaration does not declare anything");
6980 pedwarn (loc, OPT_Wpedantic,
6981 "ISO C99 doesn%'t support unnamed structs/unions");
6983 pedwarn (loc, OPT_Wpedantic,
6984 "ISO C90 doesn%'t support unnamed structs/unions");
6988 value = grokdeclarator (declarator, declspecs, FIELD, false,
6989 width ? &width : NULL, decl_attrs, NULL, NULL,
6992 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
6993 DECL_INITIAL (value) = width;
6995 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
6997 /* If we currently have a binding for this field, set the
6998 in_struct field in the binding, so that we warn about lookups
7000 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
7003 /* If the in_struct field is not yet set, push it on a list
7004 to be cleared when this struct is finished. */
7007 struct_parse_info->fields.safe_push (b);
7016 /* Subroutine of detect_field_duplicates: return whether X and Y,
7017 which are both fields in the same struct, have duplicate field
7021 is_duplicate_field (tree x, tree y)
7023 if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y))
7026 /* When using -fplan9-extensions, an anonymous field whose name is a
7027 typedef can duplicate a field name. */
7028 if (flag_plan9_extensions
7029 && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE))
7031 tree xt, xn, yt, yn;
7034 if (DECL_NAME (x) != NULL_TREE)
7036 else if ((TREE_CODE (xt) == RECORD_TYPE || TREE_CODE (xt) == UNION_TYPE)
7037 && TYPE_NAME (xt) != NULL_TREE
7038 && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL)
7039 xn = DECL_NAME (TYPE_NAME (xt));
7044 if (DECL_NAME (y) != NULL_TREE)
7046 else if ((TREE_CODE (yt) == RECORD_TYPE || TREE_CODE (yt) == UNION_TYPE)
7047 && TYPE_NAME (yt) != NULL_TREE
7048 && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL)
7049 yn = DECL_NAME (TYPE_NAME (yt));
7053 if (xn != NULL_TREE && xn == yn)
7060 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7061 to HTAB, giving errors for any duplicates. */
7064 detect_field_duplicates_hash (tree fieldlist,
7065 hash_table <pointer_hash <tree_node> > htab)
7070 for (x = fieldlist; x ; x = DECL_CHAIN (x))
7071 if ((y = DECL_NAME (x)) != 0)
7073 slot = htab.find_slot (y, INSERT);
7076 error ("duplicate member %q+D", x);
7077 DECL_NAME (x) = NULL_TREE;
7081 else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7082 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7084 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab);
7086 /* When using -fplan9-extensions, an anonymous field whose
7087 name is a typedef can duplicate a field name. */
7088 if (flag_plan9_extensions
7089 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
7090 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)
7092 tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x)));
7093 slot = htab.find_slot (xn, INSERT);
7095 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x)));
7101 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7102 the list such that this does not present a problem later. */
7105 detect_field_duplicates (tree fieldlist)
7110 /* If the struct is the list of instance variables of an Objective-C
7111 class, then we need to check all the instance variables of
7112 superclasses when checking for duplicates (since you can't have
7113 an instance variable in a subclass with the same name as an
7114 instance variable in a superclass). We pass on this job to the
7115 Objective-C compiler. objc_detect_field_duplicates() will return
7116 false if we are not checking the list of instance variables and
7117 the C frontend should proceed with the standard field duplicate
7118 checks. If we are checking the list of instance variables, the
7119 ObjC frontend will do the check, emit the errors if needed, and
7120 then return true. */
7121 if (c_dialect_objc ())
7122 if (objc_detect_field_duplicates (false))
7125 /* First, see if there are more than "a few" fields.
7126 This is trivially true if there are zero or one fields. */
7127 if (!fieldlist || !DECL_CHAIN (fieldlist))
7132 if (DECL_NAME (x) == NULL_TREE
7133 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7134 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7137 } while (timeout > 0 && x);
7139 /* If there were "few" fields and no anonymous structures or unions,
7140 avoid the overhead of allocating a hash table. Instead just do
7141 the nested traversal thing. */
7144 for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x))
7145 /* When using -fplan9-extensions, we can have duplicates
7146 between typedef names and fields. */
7148 || (flag_plan9_extensions
7149 && DECL_NAME (x) == NULL_TREE
7150 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7151 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7152 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
7153 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL))
7155 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
7156 if (is_duplicate_field (y, x))
7158 error ("duplicate member %q+D", x);
7159 DECL_NAME (x) = NULL_TREE;
7165 hash_table <pointer_hash <tree_node> > htab;
7168 detect_field_duplicates_hash (fieldlist, htab);
7173 /* Finish up struct info used by -Wc++-compat. */
7176 warn_cxx_compat_finish_struct (tree fieldlist)
7180 struct c_binding *b;
7182 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7183 the current struct. We do this now at the end of the struct
7184 because the flag is used to issue visibility warnings, and we
7185 only want to issue those warnings if the type is referenced
7186 outside of the struct declaration. */
7187 FOR_EACH_VEC_ELT (struct_parse_info->struct_types, ix, x)
7188 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
7190 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7191 typedefs used when declaring fields in this struct. If the name
7192 of any of the fields is also a typedef name then the struct would
7193 not parse in C++, because the C++ lookup rules say that the
7194 typedef name would be looked up in the context of the struct, and
7195 would thus be the field rather than the typedef. */
7196 if (!struct_parse_info->typedefs_seen.is_empty ()
7197 && fieldlist != NULL_TREE)
7199 /* Use a pointer_set using the name of the typedef. We can use
7200 a pointer_set because identifiers are interned. */
7201 struct pointer_set_t *tset = pointer_set_create ();
7203 FOR_EACH_VEC_ELT (struct_parse_info->typedefs_seen, ix, x)
7204 pointer_set_insert (tset, DECL_NAME (x));
7206 for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x))
7208 if (DECL_NAME (x) != NULL_TREE
7209 && pointer_set_contains (tset, DECL_NAME (x)))
7211 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
7212 ("using %qD as both field and typedef name is "
7215 /* FIXME: It would be nice to report the location where
7216 the typedef name is used. */
7220 pointer_set_destroy (tset);
7223 /* For each field which has a binding and which was not defined in
7224 an enclosing struct, clear the in_struct field. */
7225 FOR_EACH_VEC_ELT (struct_parse_info->fields, ix, b)
7229 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7230 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7231 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7232 ATTRIBUTES are attributes to be applied to the structure.
7234 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7235 the struct was started. */
7238 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
7239 struct c_struct_parse_info *enclosing_struct_parse_info)
7242 bool toplevel = file_scope == current_scope;
7243 int saw_named_field;
7245 /* If this type was previously laid out as a forward reference,
7246 make sure we lay it out again. */
7250 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7254 for (x = fieldlist; x; x = DECL_CHAIN (x))
7256 if (DECL_NAME (x) != 0)
7259 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7260 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7266 if (TREE_CODE (t) == UNION_TYPE)
7269 pedwarn (loc, OPT_Wpedantic, "union has no named members");
7271 pedwarn (loc, OPT_Wpedantic, "union has no members");
7276 pedwarn (loc, OPT_Wpedantic, "struct has no named members");
7278 pedwarn (loc, OPT_Wpedantic, "struct has no members");
7283 /* Install struct as DECL_CONTEXT of each field decl.
7284 Also process specified field sizes, found in the DECL_INITIAL,
7285 storing 0 there after the type has been changed to precision equal
7286 to its width, rather than the precision of the specified standard
7287 type. (Correct layout requires the original type to have been preserved
7290 saw_named_field = 0;
7291 for (x = fieldlist; x; x = DECL_CHAIN (x))
7293 if (TREE_TYPE (x) == error_mark_node)
7296 DECL_CONTEXT (x) = t;
7298 /* If any field is const, the structure type is pseudo-const. */
7299 if (TREE_READONLY (x))
7300 C_TYPE_FIELDS_READONLY (t) = 1;
7303 /* A field that is pseudo-const makes the structure likewise. */
7304 tree t1 = strip_array_types (TREE_TYPE (x));
7305 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
7306 && C_TYPE_FIELDS_READONLY (t1))
7307 C_TYPE_FIELDS_READONLY (t) = 1;
7310 /* Any field that is volatile means variables of this type must be
7311 treated in some ways as volatile. */
7312 if (TREE_THIS_VOLATILE (x))
7313 C_TYPE_FIELDS_VOLATILE (t) = 1;
7315 /* Any field of nominal variable size implies structure is too. */
7316 if (C_DECL_VARIABLE_SIZE (x))
7317 C_TYPE_VARIABLE_SIZE (t) = 1;
7319 if (DECL_INITIAL (x))
7321 unsigned HOST_WIDE_INT width = tree_to_uhwi (DECL_INITIAL (x));
7322 DECL_SIZE (x) = bitsize_int (width);
7323 DECL_BIT_FIELD (x) = 1;
7324 SET_DECL_C_BIT_FIELD (x);
7328 && (DECL_BIT_FIELD (x)
7329 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
7330 DECL_PACKED (x) = 1;
7332 /* Detect flexible array member in an invalid context. */
7333 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
7334 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
7335 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
7336 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
7338 if (TREE_CODE (t) == UNION_TYPE)
7340 error_at (DECL_SOURCE_LOCATION (x),
7341 "flexible array member in union");
7342 TREE_TYPE (x) = error_mark_node;
7344 else if (DECL_CHAIN (x) != NULL_TREE)
7346 error_at (DECL_SOURCE_LOCATION (x),
7347 "flexible array member not at end of struct");
7348 TREE_TYPE (x) = error_mark_node;
7350 else if (!saw_named_field)
7352 error_at (DECL_SOURCE_LOCATION (x),
7353 "flexible array member in otherwise empty struct");
7354 TREE_TYPE (x) = error_mark_node;
7358 if (pedantic && TREE_CODE (t) == RECORD_TYPE
7359 && flexible_array_type_p (TREE_TYPE (x)))
7360 pedwarn (DECL_SOURCE_LOCATION (x), OPT_Wpedantic,
7361 "invalid use of structure with flexible array member");
7364 || TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7365 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7366 saw_named_field = 1;
7369 detect_field_duplicates (fieldlist);
7371 /* Now we have the nearly final fieldlist. Record it,
7372 then lay out the structure or union (including the fields). */
7374 TYPE_FIELDS (t) = fieldlist;
7378 if (TYPE_SIZE_UNIT (t)
7379 && TREE_CODE (TYPE_SIZE_UNIT (t)) == INTEGER_CST
7380 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t))
7381 && !valid_constant_size_p (TYPE_SIZE_UNIT (t)))
7382 error ("type %qT is too large", t);
7384 /* Give bit-fields their proper types. */
7386 tree *fieldlistp = &fieldlist;
7388 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
7389 && TREE_TYPE (*fieldlistp) != error_mark_node)
7391 unsigned HOST_WIDE_INT width
7392 = tree_to_uhwi (DECL_INITIAL (*fieldlistp));
7393 tree type = TREE_TYPE (*fieldlistp);
7394 if (width != TYPE_PRECISION (type))
7396 TREE_TYPE (*fieldlistp)
7397 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
7398 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
7400 DECL_INITIAL (*fieldlistp) = 0;
7403 fieldlistp = &DECL_CHAIN (*fieldlistp);
7406 /* Now we have the truly final field list.
7407 Store it in this type and in the variants. */
7409 TYPE_FIELDS (t) = fieldlist;
7411 /* If there are lots of fields, sort so we can look through them fast.
7412 We arbitrarily consider 16 or more elts to be "a lot". */
7417 for (x = fieldlist; x; x = DECL_CHAIN (x))
7419 if (len > 15 || DECL_NAME (x) == NULL)
7427 struct lang_type *space;
7428 struct sorted_fields_type *space2;
7430 len += list_length (x);
7432 /* Use the same allocation policy here that make_node uses, to
7433 ensure that this lives as long as the rest of the struct decl.
7434 All decls in an inline function need to be saved. */
7436 space = ggc_cleared_alloc<struct lang_type> ();
7437 space2 = (sorted_fields_type *) ggc_internal_alloc
7438 (sizeof (struct sorted_fields_type) + len * sizeof (tree));
7442 field_array = &space2->elts[0];
7443 for (x = fieldlist; x; x = DECL_CHAIN (x))
7445 field_array[len++] = x;
7447 /* If there is anonymous struct or union, break out of the loop. */
7448 if (DECL_NAME (x) == NULL)
7451 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7454 TYPE_LANG_SPECIFIC (t) = space;
7455 TYPE_LANG_SPECIFIC (t)->s->len = len;
7456 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
7457 qsort (field_array, len, sizeof (tree), field_decl_cmp);
7462 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
7464 TYPE_FIELDS (x) = TYPE_FIELDS (t);
7465 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
7466 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
7467 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
7468 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
7471 /* If this was supposed to be a transparent union, but we can't
7472 make it one, warn and turn off the flag. */
7473 if (TREE_CODE (t) == UNION_TYPE
7474 && TYPE_TRANSPARENT_AGGR (t)
7475 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
7477 TYPE_TRANSPARENT_AGGR (t) = 0;
7478 warning_at (loc, 0, "union cannot be made transparent");
7481 /* If this structure or union completes the type of any previous
7482 variable declaration, lay it out and output its rtl. */
7483 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
7487 tree decl = TREE_VALUE (x);
7488 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
7489 layout_array_type (TREE_TYPE (decl));
7490 if (TREE_CODE (decl) != TYPE_DECL)
7492 layout_decl (decl, 0);
7493 if (c_dialect_objc ())
7494 objc_check_decl (decl);
7495 rest_of_decl_compilation (decl, toplevel, 0);
7498 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
7500 /* Update type location to the one of the definition, instead of e.g.
7501 a forward declaration. */
7502 if (TYPE_STUB_DECL (t))
7503 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
7505 /* Finish debugging output for this type. */
7506 rest_of_type_compilation (t, toplevel);
7508 /* If we're inside a function proper, i.e. not file-scope and not still
7509 parsing parameters, then arrange for the size of a variable sized type
7511 if (building_stmt_list_p () && variably_modified_type_p (t, NULL_TREE))
7512 add_stmt (build_stmt (loc,
7513 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
7515 if (warn_cxx_compat)
7516 warn_cxx_compat_finish_struct (fieldlist);
7518 struct_parse_info->struct_types.release ();
7519 struct_parse_info->fields.release ();
7520 struct_parse_info->typedefs_seen.release ();
7521 XDELETE (struct_parse_info);
7523 struct_parse_info = enclosing_struct_parse_info;
7525 /* If this struct is defined inside a struct, add it to
7528 && struct_parse_info != NULL
7529 && !in_sizeof && !in_typeof && !in_alignof)
7530 struct_parse_info->struct_types.safe_push (t);
7535 /* Lay out the type T, and its element type, and so on. */
7538 layout_array_type (tree t)
7540 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
7541 layout_array_type (TREE_TYPE (t));
7545 /* Begin compiling the definition of an enumeration type.
7546 NAME is its name (or null if anonymous).
7547 LOC is the enum's location.
7548 Returns the type object, as yet incomplete.
7549 Also records info about it so that build_enumerator
7550 may be used to declare the individual values as they are read. */
7553 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
7555 tree enumtype = NULL_TREE;
7556 location_t enumloc = UNKNOWN_LOCATION;
7558 /* If this is the real definition for a previous forward reference,
7559 fill in the contents in the same object that used to be the
7560 forward reference. */
7562 if (name != NULL_TREE)
7563 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc);
7565 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
7567 enumtype = make_node (ENUMERAL_TYPE);
7568 pushtag (loc, name, enumtype);
7571 if (C_TYPE_BEING_DEFINED (enumtype))
7572 error_at (loc, "nested redefinition of %<enum %E%>", name);
7574 C_TYPE_BEING_DEFINED (enumtype) = 1;
7576 if (TYPE_VALUES (enumtype) != 0)
7578 /* This enum is a named one that has been declared already. */
7579 error_at (loc, "redeclaration of %<enum %E%>", name);
7580 if (enumloc != UNKNOWN_LOCATION)
7581 inform (enumloc, "originally defined here");
7583 /* Completely replace its old definition.
7584 The old enumerators remain defined, however. */
7585 TYPE_VALUES (enumtype) = 0;
7588 the_enum->enum_next_value = integer_zero_node;
7589 the_enum->enum_overflow = 0;
7591 if (flag_short_enums)
7592 TYPE_PACKED (enumtype) = 1;
7594 /* FIXME: This will issue a warning for a use of a type defined
7595 within sizeof in a statement expr. This is not terribly serious
7596 as C++ doesn't permit statement exprs within sizeof anyhow. */
7597 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7598 warning_at (loc, OPT_Wc___compat,
7599 "defining type in %qs expression is invalid in C++",
7602 : (in_typeof ? "typeof" : "alignof")));
7607 /* After processing and defining all the values of an enumeration type,
7608 install their decls in the enumeration type and finish it off.
7609 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7610 and ATTRIBUTES are the specified attributes.
7611 Returns ENUMTYPE. */
7614 finish_enum (tree enumtype, tree values, tree attributes)
7617 tree minnode = 0, maxnode = 0;
7620 bool toplevel = (file_scope == current_scope);
7621 struct lang_type *lt;
7623 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7625 /* Calculate the maximum value of any enumerator in this type. */
7627 if (values == error_mark_node)
7628 minnode = maxnode = integer_zero_node;
7631 minnode = maxnode = TREE_VALUE (values);
7632 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
7634 tree value = TREE_VALUE (pair);
7635 if (tree_int_cst_lt (maxnode, value))
7637 if (tree_int_cst_lt (value, minnode))
7642 /* Construct the final type of this enumeration. It is the same
7643 as one of the integral types - the narrowest one that fits, except
7644 that normally we only go as narrow as int - and signed iff any of
7645 the values are negative. */
7646 sign = (tree_int_cst_sgn (minnode) >= 0) ? UNSIGNED : SIGNED;
7647 precision = MAX (tree_int_cst_min_precision (minnode, sign),
7648 tree_int_cst_min_precision (maxnode, sign));
7650 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
7652 tem = c_common_type_for_size (precision, sign == UNSIGNED ? 1 : 0);
7655 warning (0, "enumeration values exceed range of largest integer");
7656 tem = long_long_integer_type_node;
7660 tem = sign == UNSIGNED ? unsigned_type_node : integer_type_node;
7662 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
7663 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
7664 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
7665 TYPE_SIZE (enumtype) = 0;
7667 /* If the precision of the type was specific with an attribute and it
7668 was too small, give an error. Otherwise, use it. */
7669 if (TYPE_PRECISION (enumtype))
7671 if (precision > TYPE_PRECISION (enumtype))
7672 error ("specified mode too small for enumeral values");
7675 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
7677 layout_type (enumtype);
7679 if (values != error_mark_node)
7681 /* Change the type of the enumerators to be the enum type. We
7682 need to do this irrespective of the size of the enum, for
7683 proper type checking. Replace the DECL_INITIALs of the
7684 enumerators, and the value slots of the list, with copies
7685 that have the enum type; they cannot be modified in place
7686 because they may be shared (e.g. integer_zero_node) Finally,
7687 change the purpose slots to point to the names of the decls. */
7688 for (pair = values; pair; pair = TREE_CHAIN (pair))
7690 tree enu = TREE_PURPOSE (pair);
7691 tree ini = DECL_INITIAL (enu);
7693 TREE_TYPE (enu) = enumtype;
7695 /* The ISO C Standard mandates enumerators to have type int,
7696 even though the underlying type of an enum type is
7697 unspecified. However, GCC allows enumerators of any
7698 integer type as an extensions. build_enumerator()
7699 converts any enumerators that fit in an int to type int,
7700 to avoid promotions to unsigned types when comparing
7701 integers with enumerators that fit in the int range.
7702 When -pedantic is given, build_enumerator() would have
7703 already warned about those that don't fit. Here we
7704 convert the rest to the enumerator type. */
7705 if (TREE_TYPE (ini) != integer_type_node)
7706 ini = convert (enumtype, ini);
7708 DECL_INITIAL (enu) = ini;
7709 TREE_PURPOSE (pair) = DECL_NAME (enu);
7710 TREE_VALUE (pair) = ini;
7713 TYPE_VALUES (enumtype) = values;
7716 /* Record the min/max values so that we can warn about bit-field
7717 enumerations that are too small for the values. */
7718 lt = ggc_cleared_alloc<struct lang_type> ();
7719 lt->enum_min = minnode;
7720 lt->enum_max = maxnode;
7721 TYPE_LANG_SPECIFIC (enumtype) = lt;
7723 /* Fix up all variant types of this enum type. */
7724 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
7726 if (tem == enumtype)
7728 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
7729 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
7730 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
7731 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
7732 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
7733 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
7734 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
7735 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
7736 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
7737 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
7738 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
7741 /* Finish debugging output for this type. */
7742 rest_of_type_compilation (enumtype, toplevel);
7744 /* If this enum is defined inside a struct, add it to
7747 && struct_parse_info != NULL
7748 && !in_sizeof && !in_typeof && !in_alignof)
7749 struct_parse_info->struct_types.safe_push (enumtype);
7754 /* Build and install a CONST_DECL for one value of the
7755 current enumeration type (one that was begun with start_enum).
7756 DECL_LOC is the location of the enumerator.
7757 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7758 Return a tree-list containing the CONST_DECL and its value.
7759 Assignment of sequential values by default is handled here. */
7762 build_enumerator (location_t decl_loc, location_t loc,
7763 struct c_enum_contents *the_enum, tree name, tree value)
7767 /* Validate and default VALUE. */
7771 /* Don't issue more errors for error_mark_node (i.e. an
7772 undeclared identifier) - just ignore the value expression. */
7773 if (value == error_mark_node)
7775 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
7777 error_at (loc, "enumerator value for %qE is not an integer constant",
7783 if (TREE_CODE (value) != INTEGER_CST)
7785 value = c_fully_fold (value, false, NULL);
7786 if (TREE_CODE (value) == INTEGER_CST)
7787 pedwarn (loc, OPT_Wpedantic,
7788 "enumerator value for %qE is not an integer "
7789 "constant expression", name);
7791 if (TREE_CODE (value) != INTEGER_CST)
7793 error ("enumerator value for %qE is not an integer constant",
7799 value = default_conversion (value);
7800 constant_expression_warning (value);
7805 /* Default based on previous value. */
7806 /* It should no longer be possible to have NON_LVALUE_EXPR
7810 value = the_enum->enum_next_value;
7811 if (the_enum->enum_overflow)
7812 error_at (loc, "overflow in enumeration values");
7814 /* Even though the underlying type of an enum is unspecified, the
7815 type of enumeration constants is explicitly defined as int
7816 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7818 else if (!int_fits_type_p (value, integer_type_node))
7819 pedwarn (loc, OPT_Wpedantic,
7820 "ISO C restricts enumerator values to range of %<int%>");
7822 /* The ISO C Standard mandates enumerators to have type int, even
7823 though the underlying type of an enum type is unspecified.
7824 However, GCC allows enumerators of any integer type as an
7825 extensions. Here we convert any enumerators that fit in an int
7826 to type int, to avoid promotions to unsigned types when comparing
7827 integers with enumerators that fit in the int range. When
7828 -pedantic is given, we would have already warned about those that
7829 don't fit. We have to do this here rather than in finish_enum
7830 because this value may be used to define more enumerators. */
7831 if (int_fits_type_p (value, integer_type_node))
7832 value = convert (integer_type_node, value);
7834 /* Set basis for default for next value. */
7835 the_enum->enum_next_value
7836 = build_binary_op (EXPR_LOC_OR_LOC (value, input_location),
7837 PLUS_EXPR, value, integer_one_node, 0);
7838 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
7840 /* Now create a declaration for the enum value name. */
7842 type = TREE_TYPE (value);
7843 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
7844 TYPE_PRECISION (integer_type_node)),
7845 (TYPE_PRECISION (type)
7846 >= TYPE_PRECISION (integer_type_node)
7847 && TYPE_UNSIGNED (type)));
7849 decl = build_decl (decl_loc, CONST_DECL, name, type);
7850 DECL_INITIAL (decl) = convert (type, value);
7853 return tree_cons (decl, value, NULL_TREE);
7857 /* Create the FUNCTION_DECL for a function definition.
7858 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7859 the declaration; they describe the function's name and the type it returns,
7860 but twisted together in a fashion that parallels the syntax of C.
7862 This function creates a binding context for the function body
7863 as well as setting up the FUNCTION_DECL in current_function_decl.
7865 Returns 1 on success. If the DECLARATOR is not suitable for a function
7866 (it defines a datum instead), we return 0, which tells
7867 yyparse to report a parse error. */
7870 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
7873 tree decl1, old_decl;
7874 tree restype, resdecl;
7877 current_function_returns_value = 0; /* Assume, until we see it does. */
7878 current_function_returns_null = 0;
7879 current_function_returns_abnormally = 0;
7880 warn_about_return_type = 0;
7881 c_switch_stack = NULL;
7883 /* Indicate no valid break/continue context by setting these variables
7884 to some non-null, non-label value. We'll notice and emit the proper
7885 error message in c_finish_bc_stmt. */
7886 c_break_label = c_cont_label = size_zero_node;
7888 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
7889 &attributes, NULL, NULL, DEPRECATED_NORMAL);
7891 /* If the declarator is not suitable for a function definition,
7892 cause a syntax error. */
7894 || TREE_CODE (decl1) != FUNCTION_DECL)
7897 loc = DECL_SOURCE_LOCATION (decl1);
7899 c_decl_attributes (&decl1, attributes, 0);
7901 if (DECL_DECLARED_INLINE_P (decl1)
7902 && DECL_UNINLINABLE (decl1)
7903 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
7904 warning_at (loc, OPT_Wattributes,
7905 "inline function %qD given attribute noinline",
7908 /* Handle gnu_inline attribute. */
7909 if (declspecs->inline_p
7910 && !flag_gnu89_inline
7911 && TREE_CODE (decl1) == FUNCTION_DECL
7912 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
7913 || current_function_decl))
7915 if (declspecs->storage_class != csc_static)
7916 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
7919 announce_function (decl1);
7921 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
7923 error_at (loc, "return type is an incomplete type");
7924 /* Make it return void instead. */
7926 = build_function_type (void_type_node,
7927 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
7930 if (warn_about_return_type)
7931 pedwarn_c99 (loc, flag_isoc99 ? 0
7932 : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
7933 "return type defaults to %<int%>");
7935 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7936 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7937 DECL_INITIAL (decl1) = error_mark_node;
7939 /* A nested function is not global. */
7940 if (current_function_decl != 0)
7941 TREE_PUBLIC (decl1) = 0;
7943 /* If this definition isn't a prototype and we had a prototype declaration
7944 before, copy the arg type info from that prototype. */
7945 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
7946 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
7948 current_function_prototype_locus = UNKNOWN_LOCATION;
7949 current_function_prototype_built_in = false;
7950 current_function_prototype_arg_types = NULL_TREE;
7951 if (!prototype_p (TREE_TYPE (decl1)))
7953 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
7954 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7955 TREE_TYPE (TREE_TYPE (old_decl))))
7957 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
7959 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
7960 current_function_prototype_built_in
7961 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
7962 current_function_prototype_arg_types
7963 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
7965 if (TREE_PUBLIC (decl1))
7967 /* If there is an external prototype declaration of this
7968 function, record its location but do not copy information
7969 to this decl. This may be an invisible declaration
7970 (built-in or in a scope which has finished) or simply
7971 have more refined argument types than any declaration
7973 struct c_binding *b;
7974 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
7975 if (B_IN_SCOPE (b, external_scope))
7979 tree ext_decl, ext_type;
7981 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
7982 if (TREE_CODE (ext_type) == FUNCTION_TYPE
7983 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7984 TREE_TYPE (ext_type)))
7986 current_function_prototype_locus
7987 = DECL_SOURCE_LOCATION (ext_decl);
7988 current_function_prototype_built_in
7989 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
7990 current_function_prototype_arg_types
7991 = TYPE_ARG_TYPES (ext_type);
7997 /* Optionally warn of old-fashioned def with no previous prototype. */
7998 if (warn_strict_prototypes
7999 && old_decl != error_mark_node
8000 && !prototype_p (TREE_TYPE (decl1))
8001 && C_DECL_ISNT_PROTOTYPE (old_decl))
8002 warning_at (loc, OPT_Wstrict_prototypes,
8003 "function declaration isn%'t a prototype");
8004 /* Optionally warn of any global def with no previous prototype. */
8005 else if (warn_missing_prototypes
8006 && old_decl != error_mark_node
8007 && TREE_PUBLIC (decl1)
8008 && !MAIN_NAME_P (DECL_NAME (decl1))
8009 && C_DECL_ISNT_PROTOTYPE (old_decl)
8010 && !DECL_DECLARED_INLINE_P (decl1))
8011 warning_at (loc, OPT_Wmissing_prototypes,
8012 "no previous prototype for %qD", decl1);
8013 /* Optionally warn of any def with no previous prototype
8014 if the function has already been used. */
8015 else if (warn_missing_prototypes
8017 && old_decl != error_mark_node
8018 && TREE_USED (old_decl)
8019 && !prototype_p (TREE_TYPE (old_decl)))
8020 warning_at (loc, OPT_Wmissing_prototypes,
8021 "%qD was used with no prototype before its definition", decl1);
8022 /* Optionally warn of any global def with no previous declaration. */
8023 else if (warn_missing_declarations
8024 && TREE_PUBLIC (decl1)
8026 && !MAIN_NAME_P (DECL_NAME (decl1)))
8027 warning_at (loc, OPT_Wmissing_declarations,
8028 "no previous declaration for %qD",
8030 /* Optionally warn of any def with no previous declaration
8031 if the function has already been used. */
8032 else if (warn_missing_declarations
8034 && old_decl != error_mark_node
8035 && TREE_USED (old_decl)
8036 && C_DECL_IMPLICIT (old_decl))
8037 warning_at (loc, OPT_Wmissing_declarations,
8038 "%qD was used with no declaration before its definition", decl1);
8040 /* This function exists in static storage.
8041 (This does not mean `static' in the C sense!) */
8042 TREE_STATIC (decl1) = 1;
8044 /* This is the earliest point at which we might know the assembler
8045 name of the function. Thus, if it's set before this, die horribly. */
8046 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
8048 /* If #pragma weak was used, mark the decl weak now. */
8049 if (current_scope == file_scope)
8050 maybe_apply_pragma_weak (decl1);
8052 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8053 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
8055 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
8056 != integer_type_node)
8057 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
8058 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1))))
8059 pedwarn (loc, OPT_Wmain, "%<_Atomic%>-qualified return type of %qD",
8062 check_main_parameter_types (decl1);
8064 if (!TREE_PUBLIC (decl1))
8065 pedwarn (loc, OPT_Wmain,
8066 "%qD is normally a non-static function", decl1);
8069 /* Record the decl so that the function name is defined.
8070 If we already have a decl for this name, and it is a FUNCTION_DECL,
8071 use the old decl. */
8073 current_function_decl = pushdecl (decl1);
8076 declare_parm_level ();
8078 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
8079 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
8080 DECL_ARTIFICIAL (resdecl) = 1;
8081 DECL_IGNORED_P (resdecl) = 1;
8082 DECL_RESULT (current_function_decl) = resdecl;
8084 start_fname_decls ();
8089 /* Subroutine of store_parm_decls which handles new-style function
8090 definitions (prototype format). The parms already have decls, so we
8091 need only record them as in effect and complain if any redundant
8092 old-style parm decls were written. */
8094 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
8100 if (current_scope->bindings)
8102 error_at (DECL_SOURCE_LOCATION (fndecl),
8103 "old-style parameter declarations in prototyped "
8104 "function definition");
8106 /* Get rid of the old-style declarations. */
8110 /* Don't issue this warning for nested functions, and don't issue this
8111 warning if we got here because ARG_INFO_TYPES was error_mark_node
8112 (this happens when a function definition has just an ellipsis in
8113 its parameter list). */
8114 else if (!in_system_header_at (input_location)
8115 && !current_function_scope
8116 && arg_info->types != error_mark_node)
8117 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
8118 "traditional C rejects ISO C style function definitions");
8120 /* Now make all the parameter declarations visible in the function body.
8121 We can bypass most of the grunt work of pushdecl. */
8122 for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl))
8124 DECL_CONTEXT (decl) = current_function_decl;
8125 if (DECL_NAME (decl))
8127 bind (DECL_NAME (decl), decl, current_scope,
8128 /*invisible=*/false, /*nested=*/false,
8130 if (!TREE_USED (decl))
8131 warn_if_shadowing (decl);
8134 error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted");
8137 /* Record the parameter list in the function declaration. */
8138 DECL_ARGUMENTS (fndecl) = arg_info->parms;
8140 /* Now make all the ancillary declarations visible, likewise. */
8141 for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl))
8143 DECL_CONTEXT (decl) = current_function_decl;
8144 if (DECL_NAME (decl))
8145 bind (DECL_NAME (decl), decl, current_scope,
8146 /*invisible=*/false,
8147 /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL),
8151 /* And all the tag declarations. */
8152 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
8154 bind (tag->id, tag->type, current_scope,
8155 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
8158 /* Subroutine of store_parm_decls which handles old-style function
8159 definitions (separate parameter list and declarations). */
8162 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
8164 struct c_binding *b;
8165 tree parm, decl, last;
8166 tree parmids = arg_info->parms;
8167 struct pointer_set_t *seen_args = pointer_set_create ();
8169 if (!in_system_header_at (input_location))
8170 warning_at (DECL_SOURCE_LOCATION (fndecl),
8171 OPT_Wold_style_definition, "old-style function definition");
8173 /* Match each formal parameter name with its declaration. Save each
8174 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8175 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8177 if (TREE_VALUE (parm) == 0)
8179 error_at (DECL_SOURCE_LOCATION (fndecl),
8180 "parameter name missing from parameter list");
8181 TREE_PURPOSE (parm) = 0;
8185 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
8186 if (b && B_IN_CURRENT_SCOPE (b))
8189 /* Skip erroneous parameters. */
8190 if (decl == error_mark_node)
8192 /* If we got something other than a PARM_DECL it is an error. */
8193 if (TREE_CODE (decl) != PARM_DECL)
8194 error_at (DECL_SOURCE_LOCATION (decl),
8195 "%qD declared as a non-parameter", decl);
8196 /* If the declaration is already marked, we have a duplicate
8197 name. Complain and ignore the duplicate. */
8198 else if (pointer_set_contains (seen_args, decl))
8200 error_at (DECL_SOURCE_LOCATION (decl),
8201 "multiple parameters named %qD", decl);
8202 TREE_PURPOSE (parm) = 0;
8205 /* If the declaration says "void", complain and turn it into
8207 else if (VOID_TYPE_P (TREE_TYPE (decl)))
8209 error_at (DECL_SOURCE_LOCATION (decl),
8210 "parameter %qD declared with void type", decl);
8211 TREE_TYPE (decl) = integer_type_node;
8212 DECL_ARG_TYPE (decl) = integer_type_node;
8213 layout_decl (decl, 0);
8215 warn_if_shadowing (decl);
8217 /* If no declaration found, default to int. */
8220 /* FIXME diagnostics: This should be the location of the argument,
8221 not the FNDECL. E.g., for an old-style declaration
8223 int f10(v) { blah; }
8225 We should use the location of the V, not the F10.
8226 Unfortunately, the V is an IDENTIFIER_NODE which has no
8227 location. In the future we need locations for c_arg_info
8230 See gcc.dg/Wshadow-3.c for an example of this problem. */
8231 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
8232 PARM_DECL, TREE_VALUE (parm), integer_type_node);
8233 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
8235 warn_if_shadowing (decl);
8238 pedwarn (DECL_SOURCE_LOCATION (decl),
8239 0, "type of %qD defaults to %<int%>", decl);
8241 warning_at (DECL_SOURCE_LOCATION (decl),
8242 OPT_Wmissing_parameter_type,
8243 "type of %qD defaults to %<int%>", decl);
8246 TREE_PURPOSE (parm) = decl;
8247 pointer_set_insert (seen_args, decl);
8250 /* Now examine the parms chain for incomplete declarations
8251 and declarations with no corresponding names. */
8253 for (b = current_scope->bindings; b; b = b->prev)
8256 if (TREE_CODE (parm) != PARM_DECL)
8259 if (TREE_TYPE (parm) != error_mark_node
8260 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
8262 error_at (DECL_SOURCE_LOCATION (parm),
8263 "parameter %qD has incomplete type", parm);
8264 TREE_TYPE (parm) = error_mark_node;
8267 if (!pointer_set_contains (seen_args, parm))
8269 error_at (DECL_SOURCE_LOCATION (parm),
8270 "declaration for parameter %qD but no such parameter",
8273 /* Pretend the parameter was not missing.
8274 This gets us to a standard state and minimizes
8275 further error messages. */
8276 parmids = chainon (parmids, tree_cons (parm, 0, 0));
8280 /* Chain the declarations together in the order of the list of
8281 names. Store that chain in the function decl, replacing the
8282 list of names. Update the current scope to match. */
8283 DECL_ARGUMENTS (fndecl) = 0;
8285 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8286 if (TREE_PURPOSE (parm))
8288 if (parm && TREE_PURPOSE (parm))
8290 last = TREE_PURPOSE (parm);
8291 DECL_ARGUMENTS (fndecl) = last;
8293 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
8294 if (TREE_PURPOSE (parm))
8296 DECL_CHAIN (last) = TREE_PURPOSE (parm);
8297 last = TREE_PURPOSE (parm);
8299 DECL_CHAIN (last) = 0;
8302 pointer_set_destroy (seen_args);
8304 /* If there was a previous prototype,
8305 set the DECL_ARG_TYPE of each argument according to
8306 the type previously specified, and report any mismatches. */
8308 if (current_function_prototype_arg_types)
8311 for (parm = DECL_ARGUMENTS (fndecl),
8312 type = current_function_prototype_arg_types;
8313 parm || (type && TREE_VALUE (type) != error_mark_node
8314 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
8315 parm = DECL_CHAIN (parm), type = TREE_CHAIN (type))
8317 if (parm == 0 || type == 0
8318 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
8320 if (current_function_prototype_built_in)
8321 warning_at (DECL_SOURCE_LOCATION (fndecl),
8322 0, "number of arguments doesn%'t match "
8323 "built-in prototype");
8326 /* FIXME diagnostics: This should be the location of
8327 FNDECL, but there is bug when a prototype is
8328 declared inside function context, but defined
8329 outside of it (e.g., gcc.dg/pr15698-2.c). In
8330 which case FNDECL gets the location of the
8331 prototype, not the definition. */
8332 error_at (input_location,
8333 "number of arguments doesn%'t match prototype");
8335 error_at (current_function_prototype_locus,
8336 "prototype declaration");
8340 /* Type for passing arg must be consistent with that
8341 declared for the arg. ISO C says we take the unqualified
8342 type for parameters declared with qualified type. */
8343 if (TREE_TYPE (parm) != error_mark_node
8344 && TREE_TYPE (type) != error_mark_node
8345 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
8346 != TYPE_ATOMIC (TREE_VALUE (type)))
8347 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
8348 TYPE_MAIN_VARIANT (TREE_VALUE (type)))))
8350 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
8351 == TYPE_ATOMIC (TREE_VALUE (type)))
8352 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
8353 == TYPE_MAIN_VARIANT (TREE_VALUE (type))))
8355 /* Adjust argument to match prototype. E.g. a previous
8356 `int foo(float);' prototype causes
8357 `int foo(x) float x; {...}' to be treated like
8358 `int foo(float x) {...}'. This is particularly
8359 useful for argument types like uid_t. */
8360 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
8362 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
8363 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
8364 && TYPE_PRECISION (TREE_TYPE (parm))
8365 < TYPE_PRECISION (integer_type_node))
8366 DECL_ARG_TYPE (parm)
8367 = c_type_promotes_to (TREE_TYPE (parm));
8369 /* ??? Is it possible to get here with a
8370 built-in prototype or will it always have
8371 been diagnosed as conflicting with an
8372 old-style definition and discarded? */
8373 if (current_function_prototype_built_in)
8374 warning_at (DECL_SOURCE_LOCATION (parm),
8375 OPT_Wpedantic, "promoted argument %qD "
8376 "doesn%'t match built-in prototype", parm);
8379 pedwarn (DECL_SOURCE_LOCATION (parm),
8380 OPT_Wpedantic, "promoted argument %qD "
8381 "doesn%'t match prototype", parm);
8382 pedwarn (current_function_prototype_locus, OPT_Wpedantic,
8383 "prototype declaration");
8388 if (current_function_prototype_built_in)
8389 warning_at (DECL_SOURCE_LOCATION (parm),
8390 0, "argument %qD doesn%'t match "
8391 "built-in prototype", parm);
8394 error_at (DECL_SOURCE_LOCATION (parm),
8395 "argument %qD doesn%'t match prototype", parm);
8396 error_at (current_function_prototype_locus,
8397 "prototype declaration");
8402 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
8405 /* Otherwise, create a prototype that would match. */
8409 tree actual = 0, last = 0, type;
8411 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm))
8413 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
8415 TREE_CHAIN (last) = type;
8420 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
8422 TREE_CHAIN (last) = type;
8426 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8427 of the type of this function, but we need to avoid having this
8428 affect the types of other similarly-typed functions, so we must
8429 first force the generation of an identical (but separate) type
8430 node for the relevant function type. The new node we create
8431 will be a variant of the main variant of the original function
8434 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
8436 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
8440 /* Store parameter declarations passed in ARG_INFO into the current
8441 function declaration. */
8444 store_parm_decls_from (struct c_arg_info *arg_info)
8446 current_function_arg_info = arg_info;
8447 store_parm_decls ();
8450 /* Store the parameter declarations into the current function declaration.
8451 This is called after parsing the parameter declarations, before
8452 digesting the body of the function.
8454 For an old-style definition, construct a prototype out of the old-style
8455 parameter declarations and inject it into the function's type. */
8458 store_parm_decls (void)
8460 tree fndecl = current_function_decl;
8463 /* The argument information block for FNDECL. */
8464 struct c_arg_info *arg_info = current_function_arg_info;
8465 current_function_arg_info = 0;
8467 /* True if this definition is written with a prototype. Note:
8468 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8469 list in a function definition as equivalent to (void) -- an
8470 empty argument list specifies the function has no parameters,
8471 but only (void) sets up a prototype for future calls. */
8472 proto = arg_info->types != 0;
8475 store_parm_decls_newstyle (fndecl, arg_info);
8477 store_parm_decls_oldstyle (fndecl, arg_info);
8479 /* The next call to push_scope will be a function body. */
8481 next_is_function_body = true;
8483 /* Write a record describing this function definition to the prototypes
8484 file (if requested). */
8486 gen_aux_info_record (fndecl, 1, 0, proto);
8488 /* Initialize the RTL code for the function. */
8489 allocate_struct_function (fndecl, false);
8491 if (warn_unused_local_typedefs)
8492 cfun->language = ggc_cleared_alloc<language_function> ();
8494 /* Begin the statement tree for this function. */
8495 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
8497 /* ??? Insert the contents of the pending sizes list into the function
8498 to be evaluated. The only reason left to have this is
8499 void foo(int n, int array[n++])
8500 because we throw away the array type in favor of a pointer type, and
8501 thus won't naturally see the SAVE_EXPR containing the increment. All
8502 other pending sizes would be handled by gimplify_parameters. */
8503 if (arg_info->pending_sizes)
8504 add_stmt (arg_info->pending_sizes);
8507 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8508 c_finish_omp_declare_simd for function prototypes. No diagnostics
8512 temp_store_parm_decls (tree fndecl, tree parms)
8515 for (tree p = parms; p; p = DECL_CHAIN (p))
8517 DECL_CONTEXT (p) = fndecl;
8519 bind (DECL_NAME (p), p, current_scope,
8520 /*invisible=*/false, /*nested=*/false,
8525 /* Undo what temp_store_parm_decls did. */
8528 temp_pop_parm_decls (void)
8530 /* Clear all bindings in this temporary scope, so that
8531 pop_scope doesn't create a BLOCK. */
8532 struct c_binding *b = current_scope->bindings;
8533 current_scope->bindings = NULL;
8534 for (; b; b = free_binding_and_advance (b))
8536 gcc_assert (TREE_CODE (b->decl) == PARM_DECL);
8537 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
8538 I_SYMBOL_BINDING (b->id) = b->shadowed;
8539 if (b->shadowed && b->shadowed->u.type)
8540 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
8546 /* Finish up a function declaration and compile that function
8547 all the way to assembler language output. Then free the storage
8548 for the function definition.
8550 This is called after parsing the body of the function definition. */
8553 finish_function (void)
8555 tree fndecl = current_function_decl;
8557 if (c_dialect_objc ())
8558 objc_finish_function ();
8560 if (TREE_CODE (fndecl) == FUNCTION_DECL
8561 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
8563 tree args = DECL_ARGUMENTS (fndecl);
8564 for (; args; args = DECL_CHAIN (args))
8566 tree type = TREE_TYPE (args);
8567 if (INTEGRAL_TYPE_P (type)
8568 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
8569 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
8573 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
8574 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
8576 /* Must mark the RESULT_DECL as being in this function. */
8578 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
8579 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
8581 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
8582 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
8583 == integer_type_node && flag_isoc99)
8585 /* Hack. We don't want the middle-end to warn that this return
8586 is unreachable, so we mark its location as special. Using
8587 UNKNOWN_LOCATION has the problem that it gets clobbered in
8588 annotate_one_with_locus. A cleaner solution might be to
8589 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8591 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
8594 /* Tie off the statement tree for this function. */
8595 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
8597 /* If the function has _Cilk_spawn in front of a function call inside it
8598 i.e. it is a spawning function, then add the appropriate Cilk plus
8599 functions inside. */
8600 if (fn_contains_cilk_spawn_p (cfun))
8601 cfun->cilk_frame_decl = insert_cilk_frame (fndecl);
8603 finish_fname_decls ();
8605 /* Complain if there's just no return statement. */
8606 if (warn_return_type
8607 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
8608 && !current_function_returns_value && !current_function_returns_null
8609 /* Don't complain if we are no-return. */
8610 && !current_function_returns_abnormally
8611 /* Don't complain if we are declared noreturn. */
8612 && !TREE_THIS_VOLATILE (fndecl)
8613 /* Don't warn for main(). */
8614 && !MAIN_NAME_P (DECL_NAME (fndecl))
8615 /* Or if they didn't actually specify a return type. */
8616 && !C_FUNCTION_IMPLICIT_INT (fndecl)
8617 /* Normally, with -Wreturn-type, flow will complain, but we might
8618 optimize out static functions. */
8619 && !TREE_PUBLIC (fndecl))
8621 warning (OPT_Wreturn_type,
8622 "no return statement in function returning non-void");
8623 TREE_NO_WARNING (fndecl) = 1;
8626 /* Complain about parameters that are only set, but never otherwise used. */
8627 if (warn_unused_but_set_parameter)
8631 for (decl = DECL_ARGUMENTS (fndecl);
8633 decl = DECL_CHAIN (decl))
8634 if (TREE_USED (decl)
8635 && TREE_CODE (decl) == PARM_DECL
8636 && !DECL_READ_P (decl)
8638 && !DECL_ARTIFICIAL (decl)
8639 && !TREE_NO_WARNING (decl))
8640 warning_at (DECL_SOURCE_LOCATION (decl),
8641 OPT_Wunused_but_set_parameter,
8642 "parameter %qD set but not used", decl);
8645 /* Complain about locally defined typedefs that are not used in this
8647 maybe_warn_unused_local_typedefs ();
8649 /* Store the end of the function, so that we get good line number
8650 info for the epilogue. */
8651 cfun->function_end_locus = input_location;
8653 /* Finalize the ELF visibility for the function. */
8654 c_determine_visibility (fndecl);
8656 /* For GNU C extern inline functions disregard inline limits. */
8657 if (DECL_EXTERNAL (fndecl)
8658 && DECL_DECLARED_INLINE_P (fndecl))
8659 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
8661 /* Genericize before inlining. Delay genericizing nested functions
8662 until their parent function is genericized. Since finalizing
8663 requires GENERIC, delay that as well. */
8665 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
8666 && !undef_nested_function)
8668 if (!decl_function_context (fndecl))
8670 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
8671 c_genericize (fndecl);
8673 /* ??? Objc emits functions after finalizing the compilation unit.
8674 This should be cleaned up later and this conditional removed. */
8675 if (cgraph_global_info_ready)
8677 cgraph_add_new_function (fndecl, false);
8680 cgraph_finalize_function (fndecl, false);
8684 /* Register this function with cgraph just far enough to get it
8685 added to our parent's nested function list. Handy, since the
8686 C front end doesn't have such a list. */
8687 (void) cgraph_get_create_node (fndecl);
8691 if (!decl_function_context (fndecl))
8692 undef_nested_function = false;
8694 if (cfun->language != NULL)
8696 ggc_free (cfun->language);
8697 cfun->language = NULL;
8700 /* We're leaving the context of this function, so zap cfun.
8701 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8702 tree_rest_of_compilation. */
8704 current_function_decl = NULL;
8707 /* Check the declarations given in a for-loop for satisfying the C99
8708 constraints. If exactly one such decl is found, return it. LOC is
8709 the location of the opening parenthesis of the for loop. The last
8710 parameter allows you to control the "for loop initial declarations
8711 are only allowed in C99 mode". Normally, you should pass
8712 flag_isoc99 as that parameter. But in some cases (Objective-C
8713 foreach loop, for example) we want to run the checks in this
8714 function even if not in C99 mode, so we allow the caller to turn
8715 off the error about not being in C99 mode.
8719 check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error)
8721 struct c_binding *b;
8722 tree one_decl = NULL_TREE;
8725 if (!turn_off_iso_c99_error)
8727 static bool hint = true;
8728 /* If we get here, declarations have been used in a for loop without
8729 the C99 for loop scope. This doesn't make much sense, so don't
8731 error_at (loc, "%<for%> loop initial declarations "
8732 "are only allowed in C99 or C11 mode");
8736 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
8737 "to compile your code");
8742 /* C99 subclause 6.8.5 paragraph 3:
8744 [#3] The declaration part of a for statement shall only
8745 declare identifiers for objects having storage class auto or
8748 It isn't clear whether, in this sentence, "identifiers" binds to
8749 "shall only declare" or to "objects" - that is, whether all identifiers
8750 declared must be identifiers for objects, or whether the restriction
8751 only applies to those that are. (A question on this in comp.std.c
8752 in November 2000 received no answer.) We implement the strictest
8753 interpretation, to avoid creating an extension which later causes
8756 for (b = current_scope->bindings; b; b = b->prev)
8759 tree decl = b->decl;
8764 switch (TREE_CODE (decl))
8768 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
8769 if (TREE_STATIC (decl))
8771 "declaration of static variable %qD in %<for%> loop "
8772 "initial declaration", decl);
8773 else if (DECL_EXTERNAL (decl))
8775 "declaration of %<extern%> variable %qD in %<for%> loop "
8776 "initial declaration", decl);
8782 "%<struct %E%> declared in %<for%> loop initial "
8787 "%<union %E%> declared in %<for%> loop initial declaration",
8791 error_at (loc, "%<enum %E%> declared in %<for%> loop "
8792 "initial declaration", id);
8795 error_at (loc, "declaration of non-variable "
8796 "%qD in %<for%> loop initial declaration", decl);
8803 return n_decls == 1 ? one_decl : NULL_TREE;
8806 /* Save and reinitialize the variables
8807 used during compilation of a C function. */
8810 c_push_function_context (void)
8812 struct language_function *p = cfun->language;
8813 /* cfun->language might have been already allocated by the use of
8814 -Wunused-local-typedefs. In that case, just re-use it. */
8816 cfun->language = p = ggc_cleared_alloc<language_function> ();
8818 p->base.x_stmt_tree = c_stmt_tree;
8819 c_stmt_tree.x_cur_stmt_list = vec_safe_copy (c_stmt_tree.x_cur_stmt_list);
8820 p->x_break_label = c_break_label;
8821 p->x_cont_label = c_cont_label;
8822 p->x_switch_stack = c_switch_stack;
8823 p->arg_info = current_function_arg_info;
8824 p->returns_value = current_function_returns_value;
8825 p->returns_null = current_function_returns_null;
8826 p->returns_abnormally = current_function_returns_abnormally;
8827 p->warn_about_return_type = warn_about_return_type;
8829 push_function_context ();
8832 /* Restore the variables used during compilation of a C function. */
8835 c_pop_function_context (void)
8837 struct language_function *p;
8839 pop_function_context ();
8842 /* When -Wunused-local-typedefs is in effect, cfun->languages is
8843 used to store data throughout the life time of the current cfun,
8844 So don't deallocate it. */
8845 if (!warn_unused_local_typedefs)
8846 cfun->language = NULL;
8848 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
8849 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
8851 /* Stop pointing to the local nodes about to be freed. */
8852 /* But DECL_INITIAL must remain nonzero so we know this
8853 was an actual function definition. */
8854 DECL_INITIAL (current_function_decl) = error_mark_node;
8855 DECL_ARGUMENTS (current_function_decl) = 0;
8858 c_stmt_tree = p->base.x_stmt_tree;
8859 p->base.x_stmt_tree.x_cur_stmt_list = NULL;
8860 c_break_label = p->x_break_label;
8861 c_cont_label = p->x_cont_label;
8862 c_switch_stack = p->x_switch_stack;
8863 current_function_arg_info = p->arg_info;
8864 current_function_returns_value = p->returns_value;
8865 current_function_returns_null = p->returns_null;
8866 current_function_returns_abnormally = p->returns_abnormally;
8867 warn_about_return_type = p->warn_about_return_type;
8870 /* The functions below are required for functionality of doing
8871 function at once processing in the C front end. Currently these
8872 functions are not called from anywhere in the C front end, but as
8873 these changes continue, that will change. */
8875 /* Returns the stmt_tree (if any) to which statements are currently
8876 being added. If there is no active statement-tree, NULL is
8880 current_stmt_tree (void)
8882 return &c_stmt_tree;
8885 /* Return the global value of T as a symbol. */
8888 identifier_global_value (tree t)
8890 struct c_binding *b;
8892 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
8893 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
8899 /* In C, the only C-linkage public declaration is at file scope. */
8902 c_linkage_bindings (tree name)
8904 return identifier_global_value (name);
8907 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8908 otherwise the name is found in ridpointers from RID_INDEX. */
8911 record_builtin_type (enum rid rid_index, const char *name, tree type)
8915 id = ridpointers[(int) rid_index];
8917 id = get_identifier (name);
8918 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
8920 if (debug_hooks->type_decl)
8921 debug_hooks->type_decl (decl, false);
8924 /* Build the void_list_node (void_type_node having been created). */
8926 build_void_list_node (void)
8928 tree t = build_tree_list (NULL_TREE, void_type_node);
8932 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8935 build_c_parm (struct c_declspecs *specs, tree attrs,
8936 struct c_declarator *declarator)
8938 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
8941 ret->declarator = declarator;
8945 /* Return a declarator with nested attributes. TARGET is the inner
8946 declarator to which these attributes apply. ATTRS are the
8949 struct c_declarator *
8950 build_attrs_declarator (tree attrs, struct c_declarator *target)
8952 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8953 ret->kind = cdk_attrs;
8954 ret->declarator = target;
8955 ret->u.attrs = attrs;
8959 /* Return a declarator for a function with arguments specified by ARGS
8960 and return type specified by TARGET. */
8962 struct c_declarator *
8963 build_function_declarator (struct c_arg_info *args,
8964 struct c_declarator *target)
8966 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8967 ret->kind = cdk_function;
8968 ret->declarator = target;
8969 ret->u.arg_info = args;
8973 /* Return a declarator for the identifier IDENT (which may be
8974 NULL_TREE for an abstract declarator). */
8976 struct c_declarator *
8977 build_id_declarator (tree ident)
8979 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8981 ret->declarator = 0;
8983 /* Default value - may get reset to a more precise location. */
8984 ret->id_loc = input_location;
8988 /* Return something to represent absolute declarators containing a *.
8989 TARGET is the absolute declarator that the * contains.
8990 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8991 to apply to the pointer type. */
8993 struct c_declarator *
8994 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
8995 struct c_declarator *target)
8999 struct c_declarator *itarget = target;
9000 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9001 if (type_quals_attrs)
9003 attrs = type_quals_attrs->attrs;
9004 quals = quals_from_declspecs (type_quals_attrs);
9005 if (attrs != NULL_TREE)
9006 itarget = build_attrs_declarator (attrs, target);
9008 ret->kind = cdk_pointer;
9009 ret->declarator = itarget;
9010 ret->u.pointer_quals = quals;
9014 /* Return a pointer to a structure for an empty list of declaration
9017 struct c_declspecs *
9018 build_null_declspecs (void)
9020 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
9021 memset (&ret->locations, 0, cdw_number_of_elements);
9026 ret->align_log = -1;
9027 ret->typespec_word = cts_none;
9028 ret->storage_class = csc_none;
9029 ret->expr_const_operands = true;
9030 ret->declspecs_seen_p = false;
9031 ret->typespec_kind = ctsk_none;
9032 ret->non_sc_seen_p = false;
9033 ret->typedef_p = false;
9034 ret->explicit_signed_p = false;
9035 ret->deprecated_p = false;
9036 ret->default_int_p = false;
9037 ret->long_p = false;
9038 ret->long_long_p = false;
9039 ret->short_p = false;
9040 ret->signed_p = false;
9041 ret->unsigned_p = false;
9042 ret->complex_p = false;
9043 ret->inline_p = false;
9044 ret->noreturn_p = false;
9045 ret->thread_p = false;
9046 ret->thread_gnu_p = false;
9047 ret->const_p = false;
9048 ret->volatile_p = false;
9049 ret->atomic_p = false;
9050 ret->restrict_p = false;
9051 ret->saturating_p = false;
9052 ret->alignas_p = false;
9053 ret->address_space = ADDR_SPACE_GENERIC;
9057 /* Add the address space ADDRSPACE to the declaration specifiers
9058 SPECS, returning SPECS. */
9060 struct c_declspecs *
9061 declspecs_add_addrspace (source_location location,
9062 struct c_declspecs *specs, addr_space_t as)
9064 specs->non_sc_seen_p = true;
9065 specs->declspecs_seen_p = true;
9067 if (!ADDR_SPACE_GENERIC_P (specs->address_space)
9068 && specs->address_space != as)
9069 error ("incompatible address space qualifiers %qs and %qs",
9070 c_addr_space_name (as),
9071 c_addr_space_name (specs->address_space));
9074 specs->address_space = as;
9075 specs->locations[cdw_address_space] = location;
9080 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9083 struct c_declspecs *
9084 declspecs_add_qual (source_location loc,
9085 struct c_declspecs *specs, tree qual)
9089 specs->non_sc_seen_p = true;
9090 specs->declspecs_seen_p = true;
9091 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
9092 && C_IS_RESERVED_WORD (qual));
9093 i = C_RID_CODE (qual);
9097 dupe = specs->const_p;
9098 specs->const_p = true;
9099 specs->locations[cdw_const] = loc;
9102 dupe = specs->volatile_p;
9103 specs->volatile_p = true;
9104 specs->locations[cdw_volatile] = loc;
9107 dupe = specs->restrict_p;
9108 specs->restrict_p = true;
9109 specs->locations[cdw_restrict] = loc;
9112 dupe = specs->atomic_p;
9113 specs->atomic_p = true;
9118 if (dupe && !flag_isoc99)
9119 pedwarn (loc, OPT_Wpedantic, "duplicate %qE", qual);
9123 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9126 struct c_declspecs *
9127 declspecs_add_type (location_t loc, struct c_declspecs *specs,
9128 struct c_typespec spec)
9130 tree type = spec.spec;
9131 specs->non_sc_seen_p = true;
9132 specs->declspecs_seen_p = true;
9133 specs->typespec_kind = spec.kind;
9134 if (TREE_DEPRECATED (type))
9135 specs->deprecated_p = true;
9137 /* Handle type specifier keywords. */
9138 if (TREE_CODE (type) == IDENTIFIER_NODE
9139 && C_IS_RESERVED_WORD (type)
9140 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
9142 enum rid i = C_RID_CODE (type);
9145 error_at (loc, "two or more data types in declaration specifiers");
9148 if ((int) i <= (int) RID_LAST_MODIFIER)
9150 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9155 if (specs->long_long_p)
9157 error_at (loc, "%<long long long%> is too long for GCC");
9162 if (specs->typespec_word == cts_double)
9165 ("both %<long long%> and %<double%> in "
9166 "declaration specifiers"));
9169 pedwarn_c90 (loc, OPT_Wlong_long,
9170 "ISO C90 does not support %<long long%>");
9171 specs->long_long_p = 1;
9172 specs->locations[cdw_long_long] = loc;
9177 ("both %<long%> and %<short%> in "
9178 "declaration specifiers"));
9179 else if (specs->typespec_word == cts_auto_type)
9181 ("both %<long%> and %<__auto_type%> in "
9182 "declaration specifiers"));
9183 else if (specs->typespec_word == cts_void)
9185 ("both %<long%> and %<void%> in "
9186 "declaration specifiers"));
9187 else if (specs->typespec_word == cts_int128)
9189 ("both %<long%> and %<__int128%> in "
9190 "declaration specifiers"));
9191 else if (specs->typespec_word == cts_bool)
9193 ("both %<long%> and %<_Bool%> in "
9194 "declaration specifiers"));
9195 else if (specs->typespec_word == cts_char)
9197 ("both %<long%> and %<char%> in "
9198 "declaration specifiers"));
9199 else if (specs->typespec_word == cts_float)
9201 ("both %<long%> and %<float%> in "
9202 "declaration specifiers"));
9203 else if (specs->typespec_word == cts_dfloat32)
9205 ("both %<long%> and %<_Decimal32%> in "
9206 "declaration specifiers"));
9207 else if (specs->typespec_word == cts_dfloat64)
9209 ("both %<long%> and %<_Decimal64%> in "
9210 "declaration specifiers"));
9211 else if (specs->typespec_word == cts_dfloat128)
9213 ("both %<long%> and %<_Decimal128%> in "
9214 "declaration specifiers"));
9217 specs->long_p = true;
9218 specs->locations[cdw_long] = loc;
9222 dupe = specs->short_p;
9225 ("both %<long%> and %<short%> in "
9226 "declaration specifiers"));
9227 else if (specs->typespec_word == cts_auto_type)
9229 ("both %<short%> and %<__auto_type%> in "
9230 "declaration specifiers"));
9231 else if (specs->typespec_word == cts_void)
9233 ("both %<short%> and %<void%> in "
9234 "declaration specifiers"));
9235 else if (specs->typespec_word == cts_int128)
9237 ("both %<short%> and %<__int128%> in "
9238 "declaration specifiers"));
9239 else if (specs->typespec_word == cts_bool)
9241 ("both %<short%> and %<_Bool%> in "
9242 "declaration specifiers"));
9243 else if (specs->typespec_word == cts_char)
9245 ("both %<short%> and %<char%> in "
9246 "declaration specifiers"));
9247 else if (specs->typespec_word == cts_float)
9249 ("both %<short%> and %<float%> in "
9250 "declaration specifiers"));
9251 else if (specs->typespec_word == cts_double)
9253 ("both %<short%> and %<double%> in "
9254 "declaration specifiers"));
9255 else if (specs->typespec_word == cts_dfloat32)
9257 ("both %<short%> and %<_Decimal32%> in "
9258 "declaration specifiers"));
9259 else if (specs->typespec_word == cts_dfloat64)
9261 ("both %<short%> and %<_Decimal64%> in "
9262 "declaration specifiers"));
9263 else if (specs->typespec_word == cts_dfloat128)
9265 ("both %<short%> and %<_Decimal128%> in "
9266 "declaration specifiers"));
9269 specs->short_p = true;
9270 specs->locations[cdw_short] = loc;
9274 dupe = specs->signed_p;
9275 if (specs->unsigned_p)
9277 ("both %<signed%> and %<unsigned%> in "
9278 "declaration specifiers"));
9279 else if (specs->typespec_word == cts_auto_type)
9281 ("both %<signed%> and %<__auto_type%> in "
9282 "declaration specifiers"));
9283 else if (specs->typespec_word == cts_void)
9285 ("both %<signed%> and %<void%> in "
9286 "declaration specifiers"));
9287 else if (specs->typespec_word == cts_bool)
9289 ("both %<signed%> and %<_Bool%> in "
9290 "declaration specifiers"));
9291 else if (specs->typespec_word == cts_float)
9293 ("both %<signed%> and %<float%> in "
9294 "declaration specifiers"));
9295 else if (specs->typespec_word == cts_double)
9297 ("both %<signed%> and %<double%> in "
9298 "declaration specifiers"));
9299 else if (specs->typespec_word == cts_dfloat32)
9301 ("both %<signed%> and %<_Decimal32%> in "
9302 "declaration specifiers"));
9303 else if (specs->typespec_word == cts_dfloat64)
9305 ("both %<signed%> and %<_Decimal64%> in "
9306 "declaration specifiers"));
9307 else if (specs->typespec_word == cts_dfloat128)
9309 ("both %<signed%> and %<_Decimal128%> in "
9310 "declaration specifiers"));
9313 specs->signed_p = true;
9314 specs->locations[cdw_signed] = loc;
9318 dupe = specs->unsigned_p;
9319 if (specs->signed_p)
9321 ("both %<signed%> and %<unsigned%> in "
9322 "declaration specifiers"));
9323 else if (specs->typespec_word == cts_auto_type)
9325 ("both %<unsigned%> and %<__auto_type%> in "
9326 "declaration specifiers"));
9327 else if (specs->typespec_word == cts_void)
9329 ("both %<unsigned%> and %<void%> in "
9330 "declaration specifiers"));
9331 else if (specs->typespec_word == cts_bool)
9333 ("both %<unsigned%> and %<_Bool%> in "
9334 "declaration specifiers"));
9335 else if (specs->typespec_word == cts_float)
9337 ("both %<unsigned%> and %<float%> in "
9338 "declaration specifiers"));
9339 else if (specs->typespec_word == cts_double)
9341 ("both %<unsigned%> and %<double%> in "
9342 "declaration specifiers"));
9343 else if (specs->typespec_word == cts_dfloat32)
9345 ("both %<unsigned%> and %<_Decimal32%> in "
9346 "declaration specifiers"));
9347 else if (specs->typespec_word == cts_dfloat64)
9349 ("both %<unsigned%> and %<_Decimal64%> in "
9350 "declaration specifiers"));
9351 else if (specs->typespec_word == cts_dfloat128)
9353 ("both %<unsigned%> and %<_Decimal128%> in "
9354 "declaration specifiers"));
9357 specs->unsigned_p = true;
9358 specs->locations[cdw_unsigned] = loc;
9362 dupe = specs->complex_p;
9363 if (!flag_isoc99 && !in_system_header_at (loc))
9364 pedwarn (loc, OPT_Wpedantic,
9365 "ISO C90 does not support complex types");
9366 if (specs->typespec_word == cts_auto_type)
9368 ("both %<complex%> and %<__auto_type%> in "
9369 "declaration specifiers"));
9370 else if (specs->typespec_word == cts_void)
9372 ("both %<complex%> and %<void%> in "
9373 "declaration specifiers"));
9374 else if (specs->typespec_word == cts_bool)
9376 ("both %<complex%> and %<_Bool%> in "
9377 "declaration specifiers"));
9378 else if (specs->typespec_word == cts_dfloat32)
9380 ("both %<complex%> and %<_Decimal32%> in "
9381 "declaration specifiers"));
9382 else if (specs->typespec_word == cts_dfloat64)
9384 ("both %<complex%> and %<_Decimal64%> in "
9385 "declaration specifiers"));
9386 else if (specs->typespec_word == cts_dfloat128)
9388 ("both %<complex%> and %<_Decimal128%> in "
9389 "declaration specifiers"));
9390 else if (specs->typespec_word == cts_fract)
9392 ("both %<complex%> and %<_Fract%> in "
9393 "declaration specifiers"));
9394 else if (specs->typespec_word == cts_accum)
9396 ("both %<complex%> and %<_Accum%> in "
9397 "declaration specifiers"));
9398 else if (specs->saturating_p)
9400 ("both %<complex%> and %<_Sat%> in "
9401 "declaration specifiers"));
9404 specs->complex_p = true;
9405 specs->locations[cdw_complex] = loc;
9409 dupe = specs->saturating_p;
9410 pedwarn (loc, OPT_Wpedantic,
9411 "ISO C does not support saturating types");
9412 if (specs->typespec_word == cts_int128)
9415 ("both %<_Sat%> and %<__int128%> in "
9416 "declaration specifiers"));
9418 else if (specs->typespec_word == cts_auto_type)
9420 ("both %<_Sat%> and %<__auto_type%> in "
9421 "declaration specifiers"));
9422 else if (specs->typespec_word == cts_void)
9424 ("both %<_Sat%> and %<void%> in "
9425 "declaration specifiers"));
9426 else if (specs->typespec_word == cts_bool)
9428 ("both %<_Sat%> and %<_Bool%> in "
9429 "declaration specifiers"));
9430 else if (specs->typespec_word == cts_char)
9432 ("both %<_Sat%> and %<char%> in "
9433 "declaration specifiers"));
9434 else if (specs->typespec_word == cts_int)
9436 ("both %<_Sat%> and %<int%> in "
9437 "declaration specifiers"));
9438 else if (specs->typespec_word == cts_float)
9440 ("both %<_Sat%> and %<float%> in "
9441 "declaration specifiers"));
9442 else if (specs->typespec_word == cts_double)
9444 ("both %<_Sat%> and %<double%> in "
9445 "declaration specifiers"));
9446 else if (specs->typespec_word == cts_dfloat32)
9448 ("both %<_Sat%> and %<_Decimal32%> in "
9449 "declaration specifiers"));
9450 else if (specs->typespec_word == cts_dfloat64)
9452 ("both %<_Sat%> and %<_Decimal64%> in "
9453 "declaration specifiers"));
9454 else if (specs->typespec_word == cts_dfloat128)
9456 ("both %<_Sat%> and %<_Decimal128%> in "
9457 "declaration specifiers"));
9458 else if (specs->complex_p)
9460 ("both %<_Sat%> and %<complex%> in "
9461 "declaration specifiers"));
9464 specs->saturating_p = true;
9465 specs->locations[cdw_saturating] = loc;
9473 error_at (loc, "duplicate %qE", type);
9479 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9480 "__int128", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9482 if (specs->typespec_word != cts_none)
9485 "two or more data types in declaration specifiers");
9493 ("both %<long%> and %<__auto_type%> in "
9494 "declaration specifiers"));
9495 else if (specs->short_p)
9497 ("both %<short%> and %<__auto_type%> in "
9498 "declaration specifiers"));
9499 else if (specs->signed_p)
9501 ("both %<signed%> and %<__auto_type%> in "
9502 "declaration specifiers"));
9503 else if (specs->unsigned_p)
9505 ("both %<unsigned%> and %<__auto_type%> in "
9506 "declaration specifiers"));
9507 else if (specs->complex_p)
9509 ("both %<complex%> and %<__auto_type%> in "
9510 "declaration specifiers"));
9511 else if (specs->saturating_p)
9513 ("both %<_Sat%> and %<__auto_type%> in "
9514 "declaration specifiers"));
9517 specs->typespec_word = cts_auto_type;
9518 specs->locations[cdw_typespec] = loc;
9522 if (int128_integer_type_node == NULL_TREE)
9524 error_at (loc, "%<__int128%> is not supported for this target");
9527 if (!in_system_header_at (input_location))
9528 pedwarn (loc, OPT_Wpedantic,
9529 "ISO C does not support %<__int128%> type");
9533 ("both %<__int128%> and %<long%> in "
9534 "declaration specifiers"));
9535 else if (specs->saturating_p)
9537 ("both %<_Sat%> and %<__int128%> in "
9538 "declaration specifiers"));
9539 else if (specs->short_p)
9541 ("both %<__int128%> and %<short%> in "
9542 "declaration specifiers"));
9545 specs->typespec_word = cts_int128;
9546 specs->locations[cdw_typespec] = loc;
9552 ("both %<long%> and %<void%> in "
9553 "declaration specifiers"));
9554 else if (specs->short_p)
9556 ("both %<short%> and %<void%> in "
9557 "declaration specifiers"));
9558 else if (specs->signed_p)
9560 ("both %<signed%> and %<void%> in "
9561 "declaration specifiers"));
9562 else if (specs->unsigned_p)
9564 ("both %<unsigned%> and %<void%> in "
9565 "declaration specifiers"));
9566 else if (specs->complex_p)
9568 ("both %<complex%> and %<void%> in "
9569 "declaration specifiers"));
9570 else if (specs->saturating_p)
9572 ("both %<_Sat%> and %<void%> in "
9573 "declaration specifiers"));
9576 specs->typespec_word = cts_void;
9577 specs->locations[cdw_typespec] = loc;
9581 if (!flag_isoc99 && !in_system_header_at (loc))
9582 pedwarn (loc, OPT_Wpedantic,
9583 "ISO C90 does not support boolean types");
9586 ("both %<long%> and %<_Bool%> in "
9587 "declaration specifiers"));
9588 else if (specs->short_p)
9590 ("both %<short%> and %<_Bool%> in "
9591 "declaration specifiers"));
9592 else if (specs->signed_p)
9594 ("both %<signed%> and %<_Bool%> in "
9595 "declaration specifiers"));
9596 else if (specs->unsigned_p)
9598 ("both %<unsigned%> and %<_Bool%> in "
9599 "declaration specifiers"));
9600 else if (specs->complex_p)
9602 ("both %<complex%> and %<_Bool%> in "
9603 "declaration specifiers"));
9604 else if (specs->saturating_p)
9606 ("both %<_Sat%> and %<_Bool%> in "
9607 "declaration specifiers"));
9610 specs->typespec_word = cts_bool;
9611 specs->locations[cdw_typespec] = loc;
9617 ("both %<long%> and %<char%> in "
9618 "declaration specifiers"));
9619 else if (specs->short_p)
9621 ("both %<short%> and %<char%> in "
9622 "declaration specifiers"));
9623 else if (specs->saturating_p)
9625 ("both %<_Sat%> and %<char%> in "
9626 "declaration specifiers"));
9629 specs->typespec_word = cts_char;
9630 specs->locations[cdw_typespec] = loc;
9634 if (specs->saturating_p)
9636 ("both %<_Sat%> and %<int%> in "
9637 "declaration specifiers"));
9640 specs->typespec_word = cts_int;
9641 specs->locations[cdw_typespec] = loc;
9647 ("both %<long%> and %<float%> in "
9648 "declaration specifiers"));
9649 else if (specs->short_p)
9651 ("both %<short%> and %<float%> in "
9652 "declaration specifiers"));
9653 else if (specs->signed_p)
9655 ("both %<signed%> and %<float%> in "
9656 "declaration specifiers"));
9657 else if (specs->unsigned_p)
9659 ("both %<unsigned%> and %<float%> in "
9660 "declaration specifiers"));
9661 else if (specs->saturating_p)
9663 ("both %<_Sat%> and %<float%> in "
9664 "declaration specifiers"));
9667 specs->typespec_word = cts_float;
9668 specs->locations[cdw_typespec] = loc;
9672 if (specs->long_long_p)
9674 ("both %<long long%> and %<double%> in "
9675 "declaration specifiers"));
9676 else if (specs->short_p)
9678 ("both %<short%> and %<double%> in "
9679 "declaration specifiers"));
9680 else if (specs->signed_p)
9682 ("both %<signed%> and %<double%> in "
9683 "declaration specifiers"));
9684 else if (specs->unsigned_p)
9686 ("both %<unsigned%> and %<double%> in "
9687 "declaration specifiers"));
9688 else if (specs->saturating_p)
9690 ("both %<_Sat%> and %<double%> in "
9691 "declaration specifiers"));
9694 specs->typespec_word = cts_double;
9695 specs->locations[cdw_typespec] = loc;
9703 if (i == RID_DFLOAT32)
9705 else if (i == RID_DFLOAT64)
9708 str = "_Decimal128";
9709 if (specs->long_long_p)
9711 ("both %<long long%> and %<%s%> in "
9712 "declaration specifiers"),
9716 ("both %<long%> and %<%s%> in "
9717 "declaration specifiers"),
9719 else if (specs->short_p)
9721 ("both %<short%> and %<%s%> in "
9722 "declaration specifiers"),
9724 else if (specs->signed_p)
9726 ("both %<signed%> and %<%s%> in "
9727 "declaration specifiers"),
9729 else if (specs->unsigned_p)
9731 ("both %<unsigned%> and %<%s%> in "
9732 "declaration specifiers"),
9734 else if (specs->complex_p)
9736 ("both %<complex%> and %<%s%> in "
9737 "declaration specifiers"),
9739 else if (specs->saturating_p)
9741 ("both %<_Sat%> and %<%s%> in "
9742 "declaration specifiers"),
9744 else if (i == RID_DFLOAT32)
9745 specs->typespec_word = cts_dfloat32;
9746 else if (i == RID_DFLOAT64)
9747 specs->typespec_word = cts_dfloat64;
9749 specs->typespec_word = cts_dfloat128;
9750 specs->locations[cdw_typespec] = loc;
9752 if (!targetm.decimal_float_supported_p ())
9754 ("decimal floating point not supported "
9755 "for this target"));
9756 pedwarn (loc, OPT_Wpedantic,
9757 "ISO C does not support decimal floating point");
9767 if (specs->complex_p)
9769 ("both %<complex%> and %<%s%> in "
9770 "declaration specifiers"),
9772 else if (i == RID_FRACT)
9773 specs->typespec_word = cts_fract;
9775 specs->typespec_word = cts_accum;
9776 specs->locations[cdw_typespec] = loc;
9778 if (!targetm.fixed_point_supported_p ())
9780 "fixed-point types not supported for this target");
9781 pedwarn (loc, OPT_Wpedantic,
9782 "ISO C does not support fixed-point types");
9785 /* ObjC reserved word "id", handled below. */
9791 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9792 form of ObjC type, cases such as "int" and "long" being handled
9793 above), a TYPE (struct, union, enum and typeof specifiers) or an
9794 ERROR_MARK. In none of these cases may there have previously
9795 been any type specifiers. */
9796 if (specs->type || specs->typespec_word != cts_none
9797 || specs->long_p || specs->short_p || specs->signed_p
9798 || specs->unsigned_p || specs->complex_p)
9799 error_at (loc, "two or more data types in declaration specifiers");
9800 else if (TREE_CODE (type) == TYPE_DECL)
9802 if (TREE_TYPE (type) == error_mark_node)
9803 ; /* Allow the type to default to int to avoid cascading errors. */
9806 specs->type = TREE_TYPE (type);
9807 specs->decl_attr = DECL_ATTRIBUTES (type);
9808 specs->typedef_p = true;
9809 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
9810 specs->locations[cdw_typedef] = loc;
9812 /* If this typedef name is defined in a struct, then a C++
9813 lookup would return a different value. */
9815 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
9816 warning_at (loc, OPT_Wc___compat,
9817 "C++ lookup of %qD would return a field, not a type",
9820 /* If we are parsing a struct, record that a struct field
9822 if (warn_cxx_compat && struct_parse_info != NULL)
9823 struct_parse_info->typedefs_seen.safe_push (type);
9826 else if (TREE_CODE (type) == IDENTIFIER_NODE)
9828 tree t = lookup_name (type);
9829 if (!t || TREE_CODE (t) != TYPE_DECL)
9830 error_at (loc, "%qE fails to be a typedef or built in type", type);
9831 else if (TREE_TYPE (t) == error_mark_node)
9835 specs->type = TREE_TYPE (t);
9836 specs->locations[cdw_typespec] = loc;
9841 if (TREE_CODE (type) != ERROR_MARK && spec.kind == ctsk_typeof)
9843 specs->typedef_p = true;
9844 specs->locations[cdw_typedef] = loc;
9848 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
9849 specs->expr, spec.expr);
9851 specs->expr = spec.expr;
9852 specs->expr_const_operands &= spec.expr_const_operands;
9861 /* Add the storage class specifier or function specifier SCSPEC to the
9862 declaration specifiers SPECS, returning SPECS. */
9864 struct c_declspecs *
9865 declspecs_add_scspec (source_location loc,
9866 struct c_declspecs *specs,
9870 enum c_storage_class n = csc_none;
9872 specs->declspecs_seen_p = true;
9873 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
9874 && C_IS_RESERVED_WORD (scspec));
9875 i = C_RID_CODE (scspec);
9876 if (specs->non_sc_seen_p)
9877 warning (OPT_Wold_style_declaration,
9878 "%qE is not at beginning of declaration", scspec);
9882 /* C99 permits duplicate inline. Although of doubtful utility,
9883 it seems simplest to permit it in gnu89 mode as well, as
9884 there is also little utility in maintaining this as a
9885 difference between gnu89 and C99 inline. */
9887 specs->inline_p = true;
9888 specs->locations[cdw_inline] = loc;
9891 /* Duplicate _Noreturn is permitted. */
9893 specs->noreturn_p = true;
9894 specs->locations[cdw_noreturn] = loc;
9897 dupe = specs->thread_p;
9898 if (specs->storage_class == csc_auto)
9899 error ("%qE used with %<auto%>", scspec);
9900 else if (specs->storage_class == csc_register)
9901 error ("%qE used with %<register%>", scspec);
9902 else if (specs->storage_class == csc_typedef)
9903 error ("%qE used with %<typedef%>", scspec);
9906 specs->thread_p = true;
9907 specs->thread_gnu_p = (strcmp (IDENTIFIER_POINTER (scspec),
9909 /* A diagnostic is not required for the use of this
9910 identifier in the implementation namespace; only diagnose
9911 it for the C11 spelling because of existing code using
9912 the other spelling. */
9913 if (!flag_isoc11 && !specs->thread_gnu_p)
9916 pedwarn (loc, OPT_Wpedantic,
9917 "ISO C99 does not support %qE", scspec);
9919 pedwarn (loc, OPT_Wpedantic,
9920 "ISO C90 does not support %qE", scspec);
9922 specs->locations[cdw_thread] = loc;
9930 /* Diagnose "__thread extern". */
9931 if (specs->thread_p && specs->thread_gnu_p)
9932 error ("%<__thread%> before %<extern%>");
9939 /* Diagnose "__thread static". */
9940 if (specs->thread_p && specs->thread_gnu_p)
9941 error ("%<__thread%> before %<static%>");
9949 if (n != csc_none && n == specs->storage_class)
9953 if (i == RID_THREAD)
9954 error ("duplicate %<_Thread_local%> or %<__thread%>");
9956 error ("duplicate %qE", scspec);
9960 if (specs->storage_class != csc_none && n != specs->storage_class)
9962 error ("multiple storage classes in declaration specifiers");
9966 specs->storage_class = n;
9967 specs->locations[cdw_storage_class] = loc;
9968 if (n != csc_extern && n != csc_static && specs->thread_p)
9970 error ("%qs used with %qE",
9971 specs->thread_gnu_p ? "__thread" : "_Thread_local",
9973 specs->thread_p = false;
9980 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9983 struct c_declspecs *
9984 declspecs_add_attrs (source_location loc, struct c_declspecs *specs, tree attrs)
9986 specs->attrs = chainon (attrs, specs->attrs);
9987 specs->locations[cdw_attributes] = loc;
9988 specs->declspecs_seen_p = true;
9992 /* Add an _Alignas specifier (expression ALIGN, or type whose
9993 alignment is ALIGN) to the declaration specifiers SPECS, returning
9995 struct c_declspecs *
9996 declspecs_add_alignas (source_location loc,
9997 struct c_declspecs *specs, tree align)
10000 specs->alignas_p = true;
10001 specs->locations[cdw_alignas] = loc;
10002 if (align == error_mark_node)
10004 align_log = check_user_alignment (align, true);
10005 if (align_log > specs->align_log)
10006 specs->align_log = align_log;
10010 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10011 specifiers with any other type specifier to determine the resulting
10012 type. This is where ISO C checks on complex types are made, since
10013 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10016 struct c_declspecs *
10017 finish_declspecs (struct c_declspecs *specs)
10019 /* If a type was specified as a whole, we have no modifiers and are
10021 if (specs->type != NULL_TREE)
10023 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
10024 && !specs->signed_p && !specs->unsigned_p
10025 && !specs->complex_p);
10027 /* Set a dummy type. */
10028 if (TREE_CODE (specs->type) == ERROR_MARK)
10029 specs->type = integer_type_node;
10033 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10034 has been specified, treat it as "int" unless "_Complex" is
10035 present and there are no other specifiers. If we just have
10036 "_Complex", it is equivalent to "_Complex double", but e.g.
10037 "_Complex short" is equivalent to "_Complex short int". */
10038 if (specs->typespec_word == cts_none)
10040 if (specs->saturating_p)
10042 error_at (specs->locations[cdw_saturating],
10043 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10044 if (!targetm.fixed_point_supported_p ())
10045 error_at (specs->locations[cdw_saturating],
10046 "fixed-point types not supported for this target");
10047 specs->typespec_word = cts_fract;
10049 else if (specs->long_p || specs->short_p
10050 || specs->signed_p || specs->unsigned_p)
10052 specs->typespec_word = cts_int;
10054 else if (specs->complex_p)
10056 specs->typespec_word = cts_double;
10057 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10058 "ISO C does not support plain %<complex%> meaning "
10059 "%<double complex%>");
10063 specs->typespec_word = cts_int;
10064 specs->default_int_p = true;
10065 /* We don't diagnose this here because grokdeclarator will
10066 give more specific diagnostics according to whether it is
10067 a function definition. */
10071 /* If "signed" was specified, record this to distinguish "int" and
10072 "signed int" in the case of a bit-field with
10073 -funsigned-bitfields. */
10074 specs->explicit_signed_p = specs->signed_p;
10076 /* Now compute the actual type. */
10077 switch (specs->typespec_word)
10079 case cts_auto_type:
10080 gcc_assert (!specs->long_p && !specs->short_p
10081 && !specs->signed_p && !specs->unsigned_p
10082 && !specs->complex_p);
10083 /* Type to be filled in later. */
10086 gcc_assert (!specs->long_p && !specs->short_p
10087 && !specs->signed_p && !specs->unsigned_p
10088 && !specs->complex_p);
10089 specs->type = void_type_node;
10092 gcc_assert (!specs->long_p && !specs->short_p
10093 && !specs->signed_p && !specs->unsigned_p
10094 && !specs->complex_p);
10095 specs->type = boolean_type_node;
10098 gcc_assert (!specs->long_p && !specs->short_p);
10099 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10100 if (specs->signed_p)
10101 specs->type = signed_char_type_node;
10102 else if (specs->unsigned_p)
10103 specs->type = unsigned_char_type_node;
10105 specs->type = char_type_node;
10106 if (specs->complex_p)
10108 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10109 "ISO C does not support complex integer types");
10110 specs->type = build_complex_type (specs->type);
10114 gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p);
10115 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10116 specs->type = (specs->unsigned_p
10117 ? int128_unsigned_type_node
10118 : int128_integer_type_node);
10119 if (specs->complex_p)
10121 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10122 "ISO C does not support complex integer types");
10123 specs->type = build_complex_type (specs->type);
10127 gcc_assert (!(specs->long_p && specs->short_p));
10128 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10129 if (specs->long_long_p)
10130 specs->type = (specs->unsigned_p
10131 ? long_long_unsigned_type_node
10132 : long_long_integer_type_node);
10133 else if (specs->long_p)
10134 specs->type = (specs->unsigned_p
10135 ? long_unsigned_type_node
10136 : long_integer_type_node);
10137 else if (specs->short_p)
10138 specs->type = (specs->unsigned_p
10139 ? short_unsigned_type_node
10140 : short_integer_type_node);
10142 specs->type = (specs->unsigned_p
10143 ? unsigned_type_node
10144 : integer_type_node);
10145 if (specs->complex_p)
10147 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10148 "ISO C does not support complex integer types");
10149 specs->type = build_complex_type (specs->type);
10153 gcc_assert (!specs->long_p && !specs->short_p
10154 && !specs->signed_p && !specs->unsigned_p);
10155 specs->type = (specs->complex_p
10156 ? complex_float_type_node
10157 : float_type_node);
10160 gcc_assert (!specs->long_long_p && !specs->short_p
10161 && !specs->signed_p && !specs->unsigned_p);
10164 specs->type = (specs->complex_p
10165 ? complex_long_double_type_node
10166 : long_double_type_node);
10170 specs->type = (specs->complex_p
10171 ? complex_double_type_node
10172 : double_type_node);
10177 case cts_dfloat128:
10178 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
10179 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
10180 if (specs->typespec_word == cts_dfloat32)
10181 specs->type = dfloat32_type_node;
10182 else if (specs->typespec_word == cts_dfloat64)
10183 specs->type = dfloat64_type_node;
10185 specs->type = dfloat128_type_node;
10188 gcc_assert (!specs->complex_p);
10189 if (!targetm.fixed_point_supported_p ())
10190 specs->type = integer_type_node;
10191 else if (specs->saturating_p)
10193 if (specs->long_long_p)
10194 specs->type = specs->unsigned_p
10195 ? sat_unsigned_long_long_fract_type_node
10196 : sat_long_long_fract_type_node;
10197 else if (specs->long_p)
10198 specs->type = specs->unsigned_p
10199 ? sat_unsigned_long_fract_type_node
10200 : sat_long_fract_type_node;
10201 else if (specs->short_p)
10202 specs->type = specs->unsigned_p
10203 ? sat_unsigned_short_fract_type_node
10204 : sat_short_fract_type_node;
10206 specs->type = specs->unsigned_p
10207 ? sat_unsigned_fract_type_node
10208 : sat_fract_type_node;
10212 if (specs->long_long_p)
10213 specs->type = specs->unsigned_p
10214 ? unsigned_long_long_fract_type_node
10215 : long_long_fract_type_node;
10216 else if (specs->long_p)
10217 specs->type = specs->unsigned_p
10218 ? unsigned_long_fract_type_node
10219 : long_fract_type_node;
10220 else if (specs->short_p)
10221 specs->type = specs->unsigned_p
10222 ? unsigned_short_fract_type_node
10223 : short_fract_type_node;
10225 specs->type = specs->unsigned_p
10226 ? unsigned_fract_type_node
10231 gcc_assert (!specs->complex_p);
10232 if (!targetm.fixed_point_supported_p ())
10233 specs->type = integer_type_node;
10234 else if (specs->saturating_p)
10236 if (specs->long_long_p)
10237 specs->type = specs->unsigned_p
10238 ? sat_unsigned_long_long_accum_type_node
10239 : sat_long_long_accum_type_node;
10240 else if (specs->long_p)
10241 specs->type = specs->unsigned_p
10242 ? sat_unsigned_long_accum_type_node
10243 : sat_long_accum_type_node;
10244 else if (specs->short_p)
10245 specs->type = specs->unsigned_p
10246 ? sat_unsigned_short_accum_type_node
10247 : sat_short_accum_type_node;
10249 specs->type = specs->unsigned_p
10250 ? sat_unsigned_accum_type_node
10251 : sat_accum_type_node;
10255 if (specs->long_long_p)
10256 specs->type = specs->unsigned_p
10257 ? unsigned_long_long_accum_type_node
10258 : long_long_accum_type_node;
10259 else if (specs->long_p)
10260 specs->type = specs->unsigned_p
10261 ? unsigned_long_accum_type_node
10262 : long_accum_type_node;
10263 else if (specs->short_p)
10264 specs->type = specs->unsigned_p
10265 ? unsigned_short_accum_type_node
10266 : short_accum_type_node;
10268 specs->type = specs->unsigned_p
10269 ? unsigned_accum_type_node
10274 gcc_unreachable ();
10280 /* A subroutine of c_write_global_declarations. Perform final processing
10281 on one file scope's declarations (or the external scope's declarations),
10285 c_write_global_declarations_1 (tree globals)
10290 /* Process the decls in the order they were written. */
10291 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10293 /* Check for used but undefined static functions using the C
10294 standard's definition of "used", and set TREE_NO_WARNING so
10295 that check_global_declarations doesn't repeat the check. */
10296 if (TREE_CODE (decl) == FUNCTION_DECL
10297 && DECL_INITIAL (decl) == 0
10298 && DECL_EXTERNAL (decl)
10299 && !TREE_PUBLIC (decl)
10300 && C_DECL_USED (decl))
10302 pedwarn (input_location, 0, "%q+F used but never defined", decl);
10303 TREE_NO_WARNING (decl) = 1;
10306 wrapup_global_declaration_1 (decl);
10311 reconsider = false;
10312 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10313 reconsider |= wrapup_global_declaration_2 (decl);
10315 while (reconsider);
10317 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10318 check_global_declaration_1 (decl);
10321 /* A subroutine of c_write_global_declarations Emit debug information for each
10322 of the declarations in GLOBALS. */
10325 c_write_global_declarations_2 (tree globals)
10329 for (decl = globals; decl ; decl = DECL_CHAIN (decl))
10330 debug_hooks->global_decl (decl);
10333 /* Callback to collect a source_ref from a DECL. */
10336 collect_source_ref_cb (tree decl)
10338 if (!DECL_IS_BUILTIN (decl))
10339 collect_source_ref (LOCATION_FILE (decl_sloc (decl, false)));
10342 /* Preserve the external declarations scope across a garbage collect. */
10343 static GTY(()) tree ext_block;
10345 /* Collect all references relevant to SOURCE_FILE. */
10348 collect_all_refs (const char *source_file)
10353 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10354 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file);
10356 collect_ada_nodes (BLOCK_VARS (ext_block), source_file);
10359 /* Iterate over all global declarations and call CALLBACK. */
10362 for_each_global_decl (void (*callback) (tree decl))
10369 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10371 decls = DECL_INITIAL (t);
10372 for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl))
10376 for (decl = BLOCK_VARS (ext_block); decl; decl = TREE_CHAIN (decl))
10381 c_write_global_declarations (void)
10386 /* We don't want to do this if generating a PCH. */
10390 timevar_start (TV_PHASE_DEFERRED);
10392 /* Do the Objective-C stuff. This is where all the Objective-C
10393 module stuff gets generated (symtab, class/protocol/selector
10395 if (c_dialect_objc ())
10396 objc_write_global_declarations ();
10398 /* Close the external scope. */
10399 ext_block = pop_scope ();
10400 external_scope = 0;
10401 gcc_assert (!current_scope);
10403 /* Handle -fdump-ada-spec[-slim]. */
10404 if (flag_dump_ada_spec || flag_dump_ada_spec_slim)
10406 /* Build a table of files to generate specs for */
10407 if (flag_dump_ada_spec_slim)
10408 collect_source_ref (main_input_filename);
10410 for_each_global_decl (collect_source_ref_cb);
10412 dump_ada_specs (collect_all_refs, NULL);
10417 tree tmp = BLOCK_VARS (ext_block);
10419 FILE * stream = dump_begin (TDI_tu, &flags);
10422 dump_node (tmp, flags & ~TDF_SLIM, stream);
10423 dump_end (TDI_tu, stream);
10427 /* Process all file scopes in this compilation, and the external_scope,
10428 through wrapup_global_declarations and check_global_declarations. */
10429 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10430 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
10431 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
10433 timevar_stop (TV_PHASE_DEFERRED);
10434 timevar_start (TV_PHASE_OPT_GEN);
10436 /* We're done parsing; proceed to optimize and emit assembly.
10437 FIXME: shouldn't be the front end's responsibility to call this. */
10438 finalize_compilation_unit ();
10440 timevar_stop (TV_PHASE_OPT_GEN);
10441 timevar_start (TV_PHASE_DBGINFO);
10443 /* After cgraph has had a chance to emit everything that's going to
10444 be emitted, output debug information for globals. */
10445 if (!seen_error ())
10447 timevar_push (TV_SYMOUT);
10448 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10449 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
10450 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
10451 timevar_pop (TV_SYMOUT);
10455 timevar_stop (TV_PHASE_DBGINFO);
10458 /* Register reserved keyword WORD as qualifier for address space AS. */
10461 c_register_addr_space (const char *word, addr_space_t as)
10463 int rid = RID_FIRST_ADDR_SPACE + as;
10466 /* Address space qualifiers are only supported
10467 in C with GNU extensions enabled. */
10468 if (c_dialect_objc () || flag_no_asm)
10471 id = get_identifier (word);
10472 C_SET_RID_CODE (id, rid);
10473 C_IS_RESERVED_WORD (id) = 1;
10474 ridpointers [rid] = id;
10477 /* Return identifier to look up for omp declare reduction. */
10480 c_omp_reduction_id (enum tree_code reduction_code, tree reduction_id)
10482 const char *p = NULL;
10483 switch (reduction_code)
10485 case PLUS_EXPR: p = "+"; break;
10486 case MULT_EXPR: p = "*"; break;
10487 case MINUS_EXPR: p = "-"; break;
10488 case BIT_AND_EXPR: p = "&"; break;
10489 case BIT_XOR_EXPR: p = "^"; break;
10490 case BIT_IOR_EXPR: p = "|"; break;
10491 case TRUTH_ANDIF_EXPR: p = "&&"; break;
10492 case TRUTH_ORIF_EXPR: p = "||"; break;
10493 case MIN_EXPR: p = "min"; break;
10494 case MAX_EXPR: p = "max"; break;
10501 if (TREE_CODE (reduction_id) != IDENTIFIER_NODE)
10502 return error_mark_node;
10503 p = IDENTIFIER_POINTER (reduction_id);
10506 const char prefix[] = "omp declare reduction ";
10507 size_t lenp = sizeof (prefix);
10508 size_t len = strlen (p);
10509 char *name = XALLOCAVEC (char, lenp + len);
10510 memcpy (name, prefix, lenp - 1);
10511 memcpy (name + lenp - 1, p, len + 1);
10512 return get_identifier (name);
10515 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10516 VAR_DECL, bind it into the current scope and return it. */
10519 c_omp_reduction_decl (tree reduction_id)
10521 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
10522 if (b != NULL && B_IN_CURRENT_SCOPE (b))
10525 tree decl = build_decl (BUILTINS_LOCATION, VAR_DECL,
10526 reduction_id, integer_type_node);
10527 DECL_ARTIFICIAL (decl) = 1;
10528 DECL_EXTERNAL (decl) = 1;
10529 TREE_STATIC (decl) = 1;
10530 TREE_PUBLIC (decl) = 0;
10531 bind (reduction_id, decl, current_scope, true, false, BUILTINS_LOCATION);
10535 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10538 c_omp_reduction_lookup (tree reduction_id, tree type)
10540 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
10544 for (t = DECL_INITIAL (b->decl); t; t = TREE_CHAIN (t))
10545 if (comptypes (TREE_PURPOSE (t), type))
10546 return TREE_VALUE (t);
10549 return error_mark_node;
10552 /* Helper function called via walk_tree, to diagnose invalid
10553 #pragma omp declare reduction combiners or initializers. */
10556 c_check_omp_declare_reduction_r (tree *tp, int *, void *data)
10558 tree *vars = (tree *) data;
10559 if (SSA_VAR_P (*tp)
10560 && !DECL_ARTIFICIAL (*tp)
10564 location_t loc = DECL_SOURCE_LOCATION (vars[0]);
10565 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars[0])), "omp_out") == 0)
10566 error_at (loc, "%<#pragma omp declare reduction%> combiner refers to "
10567 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10570 error_at (loc, "%<#pragma omp declare reduction%> initializer refers "
10571 "to variable %qD which is not %<omp_priv%> nor "
10579 #include "gt-c-c-decl.h"