1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988-2022 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. */
28 #define INCLUDE_STRING
29 #define INCLUDE_MEMORY
31 #include "coretypes.h"
36 #include "stringpool.h"
39 #include "print-tree.h"
40 #include "stor-layout.h"
45 #include "c-family/c-objc.h"
46 #include "c-family/c-pragma.h"
47 #include "c-family/c-ubsan.h"
49 #include "langhooks.h"
50 #include "tree-iterator.h"
53 #include "c-family/c-ada-spec.h"
55 #include "spellcheck-tree.h"
56 #include "gcc-rich-location.h"
58 #include "c-family/name-hint.h"
59 #include "c-family/known-headers.h"
60 #include "c-family/c-spellcheck.h"
61 #include "context.h" /* For 'g'. */
62 #include "omp-general.h"
63 #include "omp-offload.h" /* For offload_vars. */
65 #include "tree-pretty-print.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)) or __attribute__((unavailable)).
77 An object declared as __attribute__((unavailable)) should suppress
78 any reports of being declared with unavailable or deprecated items.
79 An object declared as __attribute__((deprecated)) should suppress
80 warnings of uses of other deprecated items. */
82 enum deprecated_states {
85 UNAVAILABLE_DEPRECATED_SUPPRESS
89 /* Nonzero if we have seen an invalid cross reference
90 to a struct, union, or enum, but not yet printed the message. */
91 tree pending_invalid_xref;
93 /* File and line to appear in the eventual error message. */
94 location_t pending_invalid_xref_location;
96 /* The file and line that the prototype came from if this is an
97 old-style definition; used for diagnostics in
98 store_parm_decls_oldstyle. */
100 static location_t current_function_prototype_locus;
102 /* Whether this prototype was built-in. */
104 static bool current_function_prototype_built_in;
106 /* The argument type information of this prototype. */
108 static tree current_function_prototype_arg_types;
110 /* The argument information structure for the function currently being
113 static struct c_arg_info *current_function_arg_info;
115 /* The obstack on which parser and related data structures, which are
116 not live beyond their top-level declaration or definition, are
118 struct obstack parser_obstack;
120 /* The current statement tree. */
122 static GTY(()) struct stmt_tree_s c_stmt_tree;
124 /* Zero if we are not in an iteration or switch statement, otherwise
125 a bitmask. See bitmask definitions in c-tree.h. */
126 unsigned char in_statement;
128 /* A list of decls to be made automatically visible in each file scope. */
129 static GTY(()) tree visible_builtins;
131 /* Set to 0 at beginning of a function definition, set to 1 if
132 a return statement that specifies a return value is seen. */
134 int current_function_returns_value;
136 /* Set to 0 at beginning of a function definition, set to 1 if
137 a return statement with no argument is seen. */
139 int current_function_returns_null;
141 /* Set to 0 at beginning of a function definition, set to 1 if
142 a call to a noreturn function is seen. */
144 int current_function_returns_abnormally;
146 /* Set to nonzero by `grokdeclarator' for a function
147 whose return type is defaulted, if warnings for this are desired. */
149 static int warn_about_return_type;
151 /* Nonzero when the current toplevel function contains a declaration
152 of a nested function which is never defined. */
154 static bool undef_nested_function;
156 /* If non-zero, implicit "omp declare target" attribute is added into the
158 int current_omp_declare_target_attribute;
160 /* Each c_binding structure describes one binding of an identifier to
161 a decl. All the decls in a scope - irrespective of namespace - are
162 chained together by the ->prev field, which (as the name implies)
163 runs in reverse order. All the decls in a given namespace bound to
164 a given identifier are chained by the ->shadowed field, which runs
165 from inner to outer scopes.
167 The ->decl field usually points to a DECL node, but there are two
168 exceptions. In the namespace of type tags, the bound entity is a
169 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
170 identifier is encountered, it is bound to error_mark_node to
171 suppress further errors about that identifier in the current
174 The ->u.type field stores the type of the declaration in this scope;
175 if NULL, the type is the type of the ->decl field. This is only of
176 relevance for objects with external or internal linkage which may
177 be redeclared in inner scopes, forming composite types that only
178 persist for the duration of those scopes. In the external scope,
179 this stores the composite of all the types declared for this
180 object, visible or not. The ->inner_comp field (used only at file
181 scope) stores whether an incomplete array type at file scope was
182 completed at an inner scope to an array size other than 1.
184 The ->u.label field is used for labels. It points to a structure
185 which stores additional information used for warnings.
187 The depth field is copied from the scope structure that holds this
188 decl. It is used to preserve the proper ordering of the ->shadowed
189 field (see bind()) and also for a handful of special-case checks.
190 Finally, the invisible bit is true for a decl which should be
191 ignored for purposes of normal name lookup, and the nested bit is
192 true for a decl that's been bound a second time in an inner scope;
193 in all such cases, the binding in the outer scope will have its
194 invisible bit true. */
196 struct GTY((chain_next ("%h.prev"))) c_binding {
197 union GTY(()) { /* first so GTY desc can use decl */
198 tree GTY((tag ("0"))) type; /* the type in this scope */
199 struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */
200 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u;
201 tree decl; /* the decl bound */
202 tree id; /* the identifier it's bound to */
203 struct c_binding *prev; /* the previous decl in this scope */
204 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
205 unsigned int depth : 28; /* depth of this scope */
206 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
207 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
208 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
209 BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */
210 location_t locus; /* location for nested bindings */
212 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
213 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
214 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
215 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
217 /* Each C symbol points to three linked lists of c_binding structures.
218 These describe the values of the identifier in the three different
219 namespaces defined by the language. */
221 struct GTY(()) lang_identifier {
222 struct c_common_identifier common_id;
223 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
224 struct c_binding *tag_binding; /* struct/union/enum tags */
225 struct c_binding *label_binding; /* labels */
228 /* Validate c-lang.cc's assumptions. */
229 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
230 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
232 /* The binding oracle; see c-tree.h. */
233 void (*c_binding_oracle) (enum c_oracle_request, tree identifier);
235 /* This flag is set on an identifier if we have previously asked the
236 binding oracle for this identifier's symbol binding. */
237 #define I_SYMBOL_CHECKED(node) \
238 (TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (node)))
240 static inline struct c_binding* *
241 i_symbol_binding (tree node)
243 struct lang_identifier *lid
244 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
246 if (lid->symbol_binding == NULL
247 && c_binding_oracle != NULL
248 && !I_SYMBOL_CHECKED (node))
250 /* Set the "checked" flag first, to avoid infinite recursion
251 when the binding oracle calls back into gcc. */
252 I_SYMBOL_CHECKED (node) = 1;
253 c_binding_oracle (C_ORACLE_SYMBOL, node);
256 return &lid->symbol_binding;
259 #define I_SYMBOL_BINDING(node) (*i_symbol_binding (node))
261 #define I_SYMBOL_DECL(node) \
262 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
264 /* This flag is set on an identifier if we have previously asked the
265 binding oracle for this identifier's tag binding. */
266 #define I_TAG_CHECKED(node) \
267 (TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (node)))
269 static inline struct c_binding **
270 i_tag_binding (tree node)
272 struct lang_identifier *lid
273 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
275 if (lid->tag_binding == NULL
276 && c_binding_oracle != NULL
277 && !I_TAG_CHECKED (node))
279 /* Set the "checked" flag first, to avoid infinite recursion
280 when the binding oracle calls back into gcc. */
281 I_TAG_CHECKED (node) = 1;
282 c_binding_oracle (C_ORACLE_TAG, node);
285 return &lid->tag_binding;
288 #define I_TAG_BINDING(node) (*i_tag_binding (node))
290 #define I_TAG_DECL(node) \
291 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
293 /* This flag is set on an identifier if we have previously asked the
294 binding oracle for this identifier's label binding. */
295 #define I_LABEL_CHECKED(node) \
296 (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (node)))
298 static inline struct c_binding **
299 i_label_binding (tree node)
301 struct lang_identifier *lid
302 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
304 if (lid->label_binding == NULL
305 && c_binding_oracle != NULL
306 && !I_LABEL_CHECKED (node))
308 /* Set the "checked" flag first, to avoid infinite recursion
309 when the binding oracle calls back into gcc. */
310 I_LABEL_CHECKED (node) = 1;
311 c_binding_oracle (C_ORACLE_LABEL, node);
314 return &lid->label_binding;
317 #define I_LABEL_BINDING(node) (*i_label_binding (node))
319 #define I_LABEL_DECL(node) \
320 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
322 /* The resulting tree type. */
324 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
325 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
327 union tree_node GTY ((tag ("0"),
328 desc ("tree_node_structure (&%h)")))
330 struct lang_identifier GTY ((tag ("1"))) identifier;
333 /* Track bindings and other things that matter for goto warnings. For
334 efficiency, we do not gather all the decls at the point of
335 definition. Instead, we point into the bindings structure. As
336 scopes are popped, we update these structures and gather the decls
337 that matter at that time. */
339 struct GTY(()) c_spot_bindings {
340 /* The currently open scope which holds bindings defined when the
341 label was defined or the goto statement was found. */
342 struct c_scope *scope;
343 /* The bindings in the scope field which were defined at the point
344 of the label or goto. This lets us look at older or newer
345 bindings in the scope, as appropriate. */
346 struct c_binding *bindings_in_scope;
347 /* The number of statement expressions that have started since this
348 label or goto statement was defined. This is zero if we are at
349 the same statement expression level. It is positive if we are in
350 a statement expression started since this spot. It is negative
351 if this spot was in a statement expression and we have left
354 /* Whether we started in a statement expression but are no longer in
355 it. This is set to true if stmt_exprs ever goes negative. */
359 /* This structure is used to keep track of bindings seen when a goto
360 statement is defined. This is only used if we see the goto
361 statement before we see the label. */
363 struct GTY(()) c_goto_bindings {
364 /* The location of the goto statement. */
366 /* The bindings of the goto statement. */
367 struct c_spot_bindings goto_bindings;
370 typedef struct c_goto_bindings *c_goto_bindings_p;
372 /* The additional information we keep track of for a label binding.
373 These fields are updated as scopes are popped. */
375 struct GTY(()) c_label_vars {
376 /* The shadowed c_label_vars, when one label shadows another (which
377 can only happen using a __label__ declaration). */
378 struct c_label_vars *shadowed;
379 /* The bindings when the label was defined. */
380 struct c_spot_bindings label_bindings;
381 /* A list of decls that we care about: decls about which we should
382 warn if a goto branches to this label from later in the function.
383 Decls are added to this list as scopes are popped. We only add
384 the decls that matter. */
385 vec<tree, va_gc> *decls_in_scope;
386 /* A list of goto statements to this label. This is only used for
387 goto statements seen before the label was defined, so that we can
388 issue appropriate warnings for them. */
389 vec<c_goto_bindings_p, va_gc> *gotos;
392 /* Each c_scope structure describes the complete contents of one
393 scope. Four scopes are distinguished specially: the innermost or
394 current scope, the innermost function scope, the file scope (always
395 the second to outermost) and the outermost or external scope.
397 Most declarations are recorded in the current scope.
399 All normal label declarations are recorded in the innermost
400 function scope, as are bindings of undeclared identifiers to
401 error_mark_node. (GCC permits nested functions as an extension,
402 hence the 'innermost' qualifier.) Explicitly declared labels
403 (using the __label__ extension) appear in the current scope.
405 Being in the file scope (current_scope == file_scope) causes
406 special behavior in several places below. Also, under some
407 conditions the Objective-C front end records declarations in the
408 file scope even though that isn't the current scope.
410 All declarations with external linkage are recorded in the external
411 scope, even if they aren't visible there; this models the fact that
412 such declarations are visible to the entire program, and (with a
413 bit of cleverness, see pushdecl) allows diagnosis of some violations
414 of C99 6.2.2p7 and 6.2.7p2:
416 If, within the same translation unit, the same identifier appears
417 with both internal and external linkage, the behavior is
420 All declarations that refer to the same object or function shall
421 have compatible type; otherwise, the behavior is undefined.
423 Initially only the built-in declarations, which describe compiler
424 intrinsic functions plus a subset of the standard library, are in
427 The order of the blocks list matters, and it is frequently appended
428 to. To avoid having to walk all the way to the end of the list on
429 each insertion, or reverse the list later, we maintain a pointer to
430 the last list entry. (FIXME: It should be feasible to use a reversed
433 The bindings list is strictly in reverse order of declarations;
434 pop_scope relies on this. */
437 struct GTY((chain_next ("%h.outer"))) c_scope {
438 /* The scope containing this one. */
439 struct c_scope *outer;
441 /* The next outermost function scope. */
442 struct c_scope *outer_function;
444 /* All bindings in this scope. */
445 struct c_binding *bindings;
447 /* For each scope (except the global one), a chain of BLOCK nodes
448 for all the scopes that were entered and exited one level down. */
452 /* The depth of this scope. Used to keep the ->shadowed chain of
453 bindings sorted innermost to outermost. */
454 unsigned int depth : 28;
456 /* True if we are currently filling this scope with parameter
458 BOOL_BITFIELD parm_flag : 1;
460 /* True if we saw [*] in this scope. Used to give an error messages
461 if these appears in a function definition. */
462 BOOL_BITFIELD had_vla_unspec : 1;
464 /* True if we already complained about forward parameter decls
465 in this scope. This prevents double warnings on
466 foo (int a; int b; ...) */
467 BOOL_BITFIELD warned_forward_parm_decls : 1;
469 /* True if this is the outermost block scope of a function body.
470 This scope contains the parameters, the local variables declared
471 in the outermost block, and all the labels (except those in
472 nested functions, or declared at block scope with __label__). */
473 BOOL_BITFIELD function_body : 1;
475 /* True means make a BLOCK for this scope no matter what. */
476 BOOL_BITFIELD keep : 1;
478 /* True means that an unsuffixed float constant is _Decimal64. */
479 BOOL_BITFIELD float_const_decimal64 : 1;
481 /* True if this scope has any label bindings. This is used to speed
482 up searching for labels when popping scopes, particularly since
483 labels are normally only found at function scope. */
484 BOOL_BITFIELD has_label_bindings : 1;
486 /* True if we should issue a warning if a goto statement crosses any
487 of the bindings. We still need to check the list of bindings to
488 find the specific ones we need to warn about. This is true if
489 decl_jump_unsafe would return true for any of the bindings. This
490 is used to avoid looping over all the bindings unnecessarily. */
491 BOOL_BITFIELD has_jump_unsafe_decl : 1;
494 /* The scope currently in effect. */
496 static GTY(()) struct c_scope *current_scope;
498 /* The innermost function scope. Ordinary (not explicitly declared)
499 labels, bindings to error_mark_node, and the lazily-created
500 bindings of __func__ and its friends get this scope. */
502 static GTY(()) struct c_scope *current_function_scope;
504 /* The C file scope. This is reset for each input translation unit. */
506 static GTY(()) struct c_scope *file_scope;
508 /* The outermost scope. This is used for all declarations with
509 external linkage, and only these, hence the name. */
511 static GTY(()) struct c_scope *external_scope;
513 /* A chain of c_scope structures awaiting reuse. */
515 static GTY((deletable)) struct c_scope *scope_freelist;
517 /* A chain of c_binding structures awaiting reuse. */
519 static GTY((deletable)) struct c_binding *binding_freelist;
521 /* Append VAR to LIST in scope SCOPE. */
522 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
523 struct c_scope *s_ = (scope); \
525 if (s_->list##_last) \
526 BLOCK_CHAIN (s_->list##_last) = d_; \
529 s_->list##_last = d_; \
532 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
533 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
534 struct c_scope *t_ = (tscope); \
535 struct c_scope *f_ = (fscope); \
537 BLOCK_CHAIN (t_->to##_last) = f_->from; \
540 t_->to##_last = f_->from##_last; \
543 /* A c_inline_static structure stores details of a static identifier
544 referenced in a definition of a function that may be an inline
545 definition if no subsequent declaration of that function uses
546 "extern" or does not use "inline". */
548 struct GTY((chain_next ("%h.next"))) c_inline_static {
549 /* The location for a diagnostic. */
552 /* The function that may be an inline definition. */
555 /* The object or function referenced. */
558 /* What sort of reference this is. */
559 enum c_inline_static_type type;
561 /* The next such structure or NULL. */
562 struct c_inline_static *next;
565 /* List of static identifiers used or referenced in functions that may
566 be inline definitions. */
567 static GTY(()) struct c_inline_static *c_inline_statics;
569 /* True means unconditionally make a BLOCK for the next scope pushed. */
571 static bool keep_next_level_flag;
573 /* True means the next call to push_scope will be the outermost scope
574 of a function body, so do not push a new scope, merely cease
575 expecting parameter decls. */
577 static bool next_is_function_body;
579 /* A vector of pointers to c_binding structures. */
581 typedef struct c_binding *c_binding_ptr;
583 /* Information that we keep for a struct or union while it is being
586 class c_struct_parse_info
589 /* If warn_cxx_compat, a list of types defined within this
591 auto_vec<tree> struct_types;
592 /* If warn_cxx_compat, a list of field names which have bindings,
593 and which are defined in this struct, but which are not defined
594 in any enclosing struct. This is used to clear the in_struct
595 field of the c_bindings structure. */
596 auto_vec<c_binding_ptr> fields;
597 /* If warn_cxx_compat, a list of typedef names used when defining
598 fields in this struct. */
599 auto_vec<tree> typedefs_seen;
602 /* Information for the struct or union currently being parsed, or
603 NULL if not parsing a struct or union. */
604 static class c_struct_parse_info *struct_parse_info;
606 /* Forward declarations. */
607 static tree lookup_name_in_scope (tree, struct c_scope *);
608 static tree c_make_fname_decl (location_t, tree, int);
609 static tree grokdeclarator (const struct c_declarator *,
610 struct c_declspecs *,
611 enum decl_context, bool, tree *, tree *, tree *,
612 bool *, enum deprecated_states);
613 static tree grokparms (struct c_arg_info *, bool);
614 static void layout_array_type (tree);
615 static void warn_defaults_to (location_t, int, const char *, ...)
616 ATTRIBUTE_GCC_DIAG(3,4);
617 static const char *header_for_builtin_fn (tree);
619 /* T is a statement. Add it to the statement-tree. This is the
620 C/ObjC version--C++ has a slightly different version of this
626 enum tree_code code = TREE_CODE (t);
628 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
630 if (!EXPR_HAS_LOCATION (t))
631 SET_EXPR_LOCATION (t, input_location);
634 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
635 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
637 /* Add T to the statement-tree. Non-side-effect statements need to be
638 recorded during statement expressions. */
639 if (!building_stmt_list_p ())
641 append_to_statement_list_force (t, &cur_stmt_list);
646 /* Build a pointer type using the default pointer mode. */
649 c_build_pointer_type (tree to_type)
651 addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC
652 : TYPE_ADDR_SPACE (to_type);
653 machine_mode pointer_mode;
655 if (as != ADDR_SPACE_GENERIC || c_default_pointer_mode == VOIDmode)
656 pointer_mode = targetm.addr_space.pointer_mode (as);
658 pointer_mode = c_default_pointer_mode;
659 return build_pointer_type_for_mode (to_type, pointer_mode, false);
663 /* Return true if we will want to say something if a goto statement
667 decl_jump_unsafe (tree decl)
669 if (error_operand_p (decl))
672 /* Don't warn for compound literals. If a goto statement crosses
673 their initialization, it should cross also all the places where
674 the complit is used or where the complit address might be saved
675 into some variable, so code after the label to which goto jumps
676 should not be able to refer to the compound literal. */
677 if (VAR_P (decl) && C_DECL_COMPOUND_LITERAL_P (decl))
680 /* Always warn about crossing variably modified types. */
681 if ((VAR_P (decl) || TREE_CODE (decl) == TYPE_DECL)
682 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
685 /* Otherwise, only warn if -Wgoto-misses-init and this is an
686 initialized automatic decl. */
687 if (warn_jump_misses_init
689 && !TREE_STATIC (decl)
690 && DECL_INITIAL (decl) != NULL_TREE)
698 c_print_identifier (FILE *file, tree node, int indent)
700 void (*save) (enum c_oracle_request, tree identifier);
702 /* Temporarily hide any binding oracle. Without this, calls to
703 debug_tree from the debugger will end up calling into the oracle,
704 making for a confusing debug session. As the oracle isn't needed
705 here for normal operation, it's simplest to suppress it. */
706 save = c_binding_oracle;
707 c_binding_oracle = NULL;
709 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
710 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
711 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
712 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
714 tree rid = ridpointers[C_RID_CODE (node)];
715 indent_to (file, indent + 4);
716 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
717 (void *) rid, IDENTIFIER_POINTER (rid));
720 c_binding_oracle = save;
723 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
724 which may be any of several kinds of DECL or TYPE or error_mark_node,
725 in the scope SCOPE. */
727 bind (tree name, tree decl, struct c_scope *scope, bool invisible,
728 bool nested, location_t locus)
730 struct c_binding *b, **here;
732 if (binding_freelist)
734 b = binding_freelist;
735 binding_freelist = b->prev;
738 b = ggc_alloc<c_binding> ();
743 b->depth = scope->depth;
744 b->invisible = invisible;
752 b->prev = scope->bindings;
755 if (decl_jump_unsafe (decl))
756 scope->has_jump_unsafe_decl = 1;
761 switch (TREE_CODE (decl))
763 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
766 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
772 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
778 /* Locate the appropriate place in the chain of shadowed decls
779 to insert this binding. Normally, scope == current_scope and
780 this does nothing. */
781 while (*here && (*here)->depth > scope->depth)
782 here = &(*here)->shadowed;
788 /* Clear the binding structure B, stick it on the binding_freelist,
789 and return the former value of b->prev. This is used by pop_scope
790 and get_parm_info to iterate destructively over all the bindings
791 from a given scope. */
792 static struct c_binding *
793 free_binding_and_advance (struct c_binding *b)
795 struct c_binding *prev = b->prev;
797 memset (b, 0, sizeof (struct c_binding));
798 b->prev = binding_freelist;
799 binding_freelist = b;
804 /* Bind a label. Like bind, but skip fields which aren't used for
805 labels, and add the LABEL_VARS value. */
807 bind_label (tree name, tree label, struct c_scope *scope,
808 struct c_label_vars *label_vars)
812 bind (name, label, scope, /*invisible=*/false, /*nested=*/false,
815 scope->has_label_bindings = true;
818 gcc_assert (b->decl == label);
819 label_vars->shadowed = b->u.label;
820 b->u.label = label_vars;
823 /* Hook called at end of compilation to assume 1 elt
824 for a file-scope tentative array defn that wasn't complete before. */
827 c_finish_incomplete_decl (tree decl)
831 tree type = TREE_TYPE (decl);
832 if (type != error_mark_node
833 && TREE_CODE (type) == ARRAY_TYPE
834 && !DECL_EXTERNAL (decl)
835 && TYPE_DOMAIN (type) == NULL_TREE)
837 warning_at (DECL_SOURCE_LOCATION (decl),
838 0, "array %q+D assumed to have one element", decl);
840 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
842 relayout_decl (decl);
847 /* Record that inline function FUNC contains a reference (location
848 LOC) to static DECL (file-scope or function-local according to
852 record_inline_static (location_t loc, tree func, tree decl,
853 enum c_inline_static_type type)
855 c_inline_static *csi = ggc_alloc<c_inline_static> ();
857 csi->function = func;
858 csi->static_decl = decl;
860 csi->next = c_inline_statics;
861 c_inline_statics = csi;
864 /* Check for references to static declarations in inline functions at
865 the end of the translation unit and diagnose them if the functions
866 are still inline definitions. */
869 check_inline_statics (void)
871 struct c_inline_static *csi;
872 for (csi = c_inline_statics; csi; csi = csi->next)
874 if (DECL_EXTERNAL (csi->function))
878 pedwarn (csi->location, 0,
879 "%qD is static but used in inline function %qD "
880 "which is not static", csi->static_decl, csi->function);
883 pedwarn (csi->location, 0,
884 "%q+D is static but declared in inline function %qD "
885 "which is not static", csi->static_decl, csi->function);
891 c_inline_statics = NULL;
894 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
895 for the current state, otherwise set it to uninitialized. */
898 set_spot_bindings (struct c_spot_bindings *p, bool defining)
902 p->scope = current_scope;
903 p->bindings_in_scope = current_scope->bindings;
908 p->bindings_in_scope = NULL;
911 p->left_stmt_expr = false;
914 /* Update spot bindings P as we pop out of SCOPE. Return true if we
915 should push decls for a label. */
918 update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p)
920 if (p->scope != scope)
922 /* This label or goto is defined in some other scope, or it is a
923 label which is not yet defined. There is nothing to
928 /* Adjust the spot bindings to refer to the bindings already defined
929 in the enclosing scope. */
930 p->scope = scope->outer;
931 p->bindings_in_scope = p->scope->bindings;
936 /* The Objective-C front-end often needs to determine the current scope. */
939 objc_get_current_scope (void)
941 return current_scope;
944 /* The following function is used only by Objective-C. It needs to live here
945 because it accesses the innards of c_scope. */
948 objc_mark_locals_volatile (void *enclosing_blk)
950 struct c_scope *scope;
953 for (scope = current_scope;
954 scope && scope != enclosing_blk;
955 scope = scope->outer)
957 for (b = scope->bindings; b; b = b->prev)
958 objc_volatilize_decl (b->decl);
960 /* Do not climb up past the current function. */
961 if (scope->function_body)
966 /* Return true if we are in the global binding level. */
969 global_bindings_p (void)
971 return current_scope == file_scope;
974 /* Return true if we're declaring parameters in an old-style function
978 old_style_parameter_scope (void)
980 /* If processing parameters and there is no function statement list, we
981 * have an old-style function declaration. */
982 return (current_scope->parm_flag && !DECL_SAVED_TREE (current_function_decl));
986 keep_next_level (void)
988 keep_next_level_flag = true;
991 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
994 set_float_const_decimal64 (void)
996 current_scope->float_const_decimal64 = true;
999 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
1002 clear_float_const_decimal64 (void)
1004 current_scope->float_const_decimal64 = false;
1007 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
1010 float_const_decimal64_p (void)
1012 return current_scope->float_const_decimal64;
1015 /* Identify this scope as currently being filled with parameters. */
1018 declare_parm_level (void)
1020 current_scope->parm_flag = true;
1026 if (next_is_function_body)
1028 /* This is the transition from the parameters to the top level
1029 of the function body. These are the same scope
1030 (C99 6.2.1p4,6) so we do not push another scope structure.
1031 next_is_function_body is set only by store_parm_decls, which
1032 in turn is called when and only when we are about to
1033 encounter the opening curly brace for the function body.
1035 The outermost block of a function always gets a BLOCK node,
1036 because the debugging output routines expect that each
1037 function has at least one BLOCK. */
1038 current_scope->parm_flag = false;
1039 current_scope->function_body = true;
1040 current_scope->keep = true;
1041 current_scope->outer_function = current_function_scope;
1042 current_function_scope = current_scope;
1044 keep_next_level_flag = false;
1045 next_is_function_body = false;
1047 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1048 if (current_scope->outer)
1049 current_scope->float_const_decimal64
1050 = current_scope->outer->float_const_decimal64;
1052 current_scope->float_const_decimal64 = false;
1056 struct c_scope *scope;
1059 scope = scope_freelist;
1060 scope_freelist = scope->outer;
1063 scope = ggc_cleared_alloc<c_scope> ();
1065 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1067 scope->float_const_decimal64 = current_scope->float_const_decimal64;
1069 scope->float_const_decimal64 = false;
1071 scope->keep = keep_next_level_flag;
1072 scope->outer = current_scope;
1073 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
1075 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
1077 if (current_scope && scope->depth == 0)
1080 sorry ("GCC supports only %u nested scopes", scope->depth);
1083 current_scope = scope;
1084 keep_next_level_flag = false;
1088 /* This is called when we are leaving SCOPE. For each label defined
1089 in SCOPE, add any appropriate decls to its decls_in_scope fields.
1090 These are the decls whose initialization will be skipped by a goto
1091 later in the function. */
1094 update_label_decls (struct c_scope *scope)
1101 if (s->has_label_bindings)
1103 struct c_binding *b;
1105 for (b = s->bindings; b != NULL; b = b->prev)
1107 struct c_label_vars *label_vars;
1108 struct c_binding *b1;
1111 struct c_goto_bindings *g;
1113 if (TREE_CODE (b->decl) != LABEL_DECL)
1115 label_vars = b->u.label;
1117 b1 = label_vars->label_bindings.bindings_in_scope;
1118 if (label_vars->label_bindings.scope == NULL)
1121 hjud = label_vars->label_bindings.scope->has_jump_unsafe_decl;
1122 if (update_spot_bindings (scope, &label_vars->label_bindings))
1124 /* This label is defined in this scope. */
1127 for (; b1 != NULL; b1 = b1->prev)
1129 /* A goto from later in the function to this
1130 label will never see the initialization
1131 of B1, if any. Save it to issue a
1132 warning if needed. */
1133 if (decl_jump_unsafe (b1->decl))
1134 vec_safe_push(label_vars->decls_in_scope, b1->decl);
1139 /* Update the bindings of any goto statements associated
1141 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1142 update_spot_bindings (scope, &g->goto_bindings);
1146 /* Don't search beyond the current function. */
1147 if (s == current_function_scope)
1154 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1157 set_type_context (tree type, tree context)
1159 for (type = TYPE_MAIN_VARIANT (type); type;
1160 type = TYPE_NEXT_VARIANT (type))
1161 TYPE_CONTEXT (type) = context;
1164 /* Exit a scope. Restore the state of the identifier-decl mappings
1165 that were in effect when this scope was entered. Return a BLOCK
1166 node containing all the DECLs in this scope that are of interest
1167 to debug info generation. */
1172 struct c_scope *scope = current_scope;
1173 tree block, context, p;
1174 struct c_binding *b;
1176 bool functionbody = scope->function_body;
1177 bool keep = functionbody || scope->keep || scope->bindings;
1179 update_label_decls (scope);
1181 /* If appropriate, create a BLOCK to record the decls for the life
1182 of this function. */
1186 block = make_node (BLOCK);
1187 BLOCK_SUBBLOCKS (block) = scope->blocks;
1188 TREE_USED (block) = 1;
1190 /* In each subblock, record that this is its superior. */
1191 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
1192 BLOCK_SUPERCONTEXT (p) = block;
1194 BLOCK_VARS (block) = NULL_TREE;
1197 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1198 scope must be set so that they point to the appropriate
1199 construct, i.e. either to the current FUNCTION_DECL node, or
1200 else to the BLOCK node we just constructed.
1202 Note that for tagged types whose scope is just the formal
1203 parameter list for some function type specification, we can't
1204 properly set their TYPE_CONTEXTs here, because we don't have a
1205 pointer to the appropriate FUNCTION_TYPE node readily available
1206 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1207 type nodes get set in `grokdeclarator' as soon as we have created
1208 the FUNCTION_TYPE node which will represent the "scope" for these
1209 "parameter list local" tagged types. */
1210 if (scope->function_body)
1211 context = current_function_decl;
1212 else if (scope == file_scope)
1215 = build_translation_unit_decl (get_identifier (main_input_filename));
1216 context = file_decl;
1217 debug_hooks->register_main_translation_unit (file_decl);
1222 /* Clear all bindings in this scope. */
1223 for (b = scope->bindings; b; b = free_binding_and_advance (b))
1226 switch (TREE_CODE (p))
1229 /* Warnings for unused labels, errors for undefined labels. */
1230 if (TREE_USED (p) && !DECL_INITIAL (p))
1232 error ("label %q+D used but not defined", p);
1233 DECL_INITIAL (p) = error_mark_node;
1236 warn_for_unused_label (p);
1238 /* Labels go in BLOCK_VARS. */
1239 DECL_CHAIN (p) = BLOCK_VARS (block);
1240 BLOCK_VARS (block) = p;
1241 gcc_assert (I_LABEL_BINDING (b->id) == b);
1242 I_LABEL_BINDING (b->id) = b->shadowed;
1244 /* Also pop back to the shadowed label_vars. */
1245 release_tree_vector (b->u.label->decls_in_scope);
1246 b->u.label = b->u.label->shadowed;
1252 set_type_context (p, context);
1254 /* Types may not have tag-names, in which case the type
1255 appears in the bindings list with b->id NULL. */
1258 gcc_assert (I_TAG_BINDING (b->id) == b);
1259 I_TAG_BINDING (b->id) = b->shadowed;
1264 /* Propagate TREE_ADDRESSABLE from nested functions to their
1265 containing functions. */
1266 if (!TREE_ASM_WRITTEN (p)
1267 && DECL_INITIAL (p) != NULL_TREE
1268 && TREE_ADDRESSABLE (p)
1269 && DECL_ABSTRACT_ORIGIN (p) != NULL_TREE
1270 && DECL_ABSTRACT_ORIGIN (p) != p)
1271 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
1272 if (!TREE_PUBLIC (p)
1273 && !DECL_INITIAL (p)
1275 && scope != file_scope
1276 && scope != external_scope)
1278 error ("nested function %q+D declared but never defined", p);
1279 undef_nested_function = true;
1281 else if (DECL_DECLARED_INLINE_P (p)
1283 && !DECL_INITIAL (p))
1285 /* C99 6.7.4p6: "a function with external linkage... declared
1286 with an inline function specifier ... shall also be defined
1287 in the same translation unit." */
1288 if (!flag_gnu89_inline
1289 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (p))
1290 && scope == external_scope)
1291 pedwarn (input_location, 0,
1292 "inline function %q+D declared but never defined", p);
1293 DECL_EXTERNAL (p) = 1;
1299 /* Warnings for unused variables. */
1300 if ((!TREE_USED (p) || !DECL_READ_P (p))
1301 && !warning_suppressed_p (p, OPT_Wunused_but_set_variable)
1302 && !DECL_IN_SYSTEM_HEADER (p)
1304 && !DECL_ARTIFICIAL (p)
1305 && scope != file_scope
1306 && scope != external_scope)
1309 warning (OPT_Wunused_variable, "unused variable %q+D", p);
1310 else if (DECL_CONTEXT (p) == current_function_decl)
1311 warning_at (DECL_SOURCE_LOCATION (p),
1312 OPT_Wunused_but_set_variable,
1313 "variable %qD set but not used", p);
1318 error ("type of array %q+D completed incompatibly with"
1319 " implicit initialization", p);
1326 /* All of these go in BLOCK_VARS, but only if this is the
1327 binding in the home scope. */
1330 DECL_CHAIN (p) = BLOCK_VARS (block);
1331 BLOCK_VARS (block) = p;
1333 else if (VAR_OR_FUNCTION_DECL_P (p) && scope != file_scope)
1335 /* For block local externs add a special
1336 DECL_EXTERNAL decl for debug info generation. */
1337 tree extp = copy_node (p);
1339 DECL_EXTERNAL (extp) = 1;
1340 TREE_STATIC (extp) = 0;
1341 TREE_PUBLIC (extp) = 1;
1342 DECL_INITIAL (extp) = NULL_TREE;
1343 DECL_LANG_SPECIFIC (extp) = NULL;
1344 DECL_CONTEXT (extp) = current_function_decl;
1345 if (TREE_CODE (p) == FUNCTION_DECL)
1347 DECL_RESULT (extp) = NULL_TREE;
1348 DECL_SAVED_TREE (extp) = NULL_TREE;
1349 DECL_STRUCT_FUNCTION (extp) = NULL;
1351 if (b->locus != UNKNOWN_LOCATION)
1352 DECL_SOURCE_LOCATION (extp) = b->locus;
1353 DECL_CHAIN (extp) = BLOCK_VARS (block);
1354 BLOCK_VARS (block) = extp;
1356 /* If this is the file scope set DECL_CONTEXT of each decl to
1357 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1359 if (scope == file_scope)
1361 DECL_CONTEXT (p) = context;
1362 if (TREE_CODE (p) == TYPE_DECL
1363 && TREE_TYPE (p) != error_mark_node)
1364 set_type_context (TREE_TYPE (p), context);
1368 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1369 already been put there by store_parm_decls. Unused-
1370 parameter warnings are handled by function.cc.
1371 error_mark_node obviously does not go in BLOCK_VARS and
1372 does not get unused-variable warnings. */
1375 /* It is possible for a decl not to have a name. We get
1376 here with b->id NULL in this case. */
1379 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
1380 I_SYMBOL_BINDING (b->id) = b->shadowed;
1381 if (b->shadowed && b->shadowed->u.type)
1382 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
1392 /* Dispose of the block that we just made inside some higher level. */
1393 if ((scope->function_body || scope == file_scope) && context)
1395 DECL_INITIAL (context) = block;
1396 BLOCK_SUPERCONTEXT (block) = context;
1398 else if (scope->outer)
1401 SCOPE_LIST_APPEND (scope->outer, blocks, block);
1402 /* If we did not make a block for the scope just exited, any
1403 blocks made for inner scopes must be carried forward so they
1404 will later become subblocks of something else. */
1405 else if (scope->blocks)
1406 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
1409 /* Pop the current scope, and free the structure for reuse. */
1410 current_scope = scope->outer;
1411 if (scope->function_body)
1412 current_function_scope = scope->outer_function;
1414 memset (scope, 0, sizeof (struct c_scope));
1415 scope->outer = scope_freelist;
1416 scope_freelist = scope;
1422 push_file_scope (void)
1430 file_scope = current_scope;
1432 start_fname_decls ();
1434 for (decl = visible_builtins; decl; decl = DECL_CHAIN (decl))
1435 bind (DECL_NAME (decl), decl, file_scope,
1436 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl));
1440 pop_file_scope (void)
1442 /* In case there were missing closebraces, get us back to the global
1444 while (current_scope != file_scope)
1447 /* __FUNCTION__ is defined at file scope (""). This
1448 call may not be necessary as my tests indicate it
1449 still works without it. */
1450 finish_fname_decls ();
1452 check_inline_statics ();
1454 /* This is the point to write out a PCH if we're doing that.
1455 In that case we do not want to do anything else. */
1458 c_common_write_pch ();
1459 /* Ensure even the callers don't try to finalize the CU. */
1460 flag_syntax_only = 1;
1464 /* Pop off the file scope and close this translation unit. */
1468 maybe_apply_pending_pragma_weaks ();
1471 /* Adjust the bindings for the start of a statement expression. */
1474 c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings)
1476 struct c_scope *scope;
1478 for (scope = current_scope; scope != NULL; scope = scope->outer)
1480 struct c_binding *b;
1482 if (!scope->has_label_bindings)
1485 for (b = scope->bindings; b != NULL; b = b->prev)
1487 struct c_label_vars *label_vars;
1489 struct c_goto_bindings *g;
1491 if (TREE_CODE (b->decl) != LABEL_DECL)
1493 label_vars = b->u.label;
1494 ++label_vars->label_bindings.stmt_exprs;
1495 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1496 ++g->goto_bindings.stmt_exprs;
1500 if (switch_bindings != NULL)
1501 ++switch_bindings->stmt_exprs;
1504 /* Adjust the bindings for the end of a statement expression. */
1507 c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings)
1509 struct c_scope *scope;
1511 for (scope = current_scope; scope != NULL; scope = scope->outer)
1513 struct c_binding *b;
1515 if (!scope->has_label_bindings)
1518 for (b = scope->bindings; b != NULL; b = b->prev)
1520 struct c_label_vars *label_vars;
1522 struct c_goto_bindings *g;
1524 if (TREE_CODE (b->decl) != LABEL_DECL)
1526 label_vars = b->u.label;
1527 --label_vars->label_bindings.stmt_exprs;
1528 if (label_vars->label_bindings.stmt_exprs < 0)
1530 label_vars->label_bindings.left_stmt_expr = true;
1531 label_vars->label_bindings.stmt_exprs = 0;
1533 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1535 --g->goto_bindings.stmt_exprs;
1536 if (g->goto_bindings.stmt_exprs < 0)
1538 g->goto_bindings.left_stmt_expr = true;
1539 g->goto_bindings.stmt_exprs = 0;
1545 if (switch_bindings != NULL)
1547 --switch_bindings->stmt_exprs;
1548 gcc_assert (switch_bindings->stmt_exprs >= 0);
1552 /* Push a definition or a declaration of struct, union or enum tag "name".
1553 "type" should be the type node.
1554 We assume that the tag "name" is not already defined, and has a location
1557 Note that the definition may really be just a forward reference.
1558 In that case, the TYPE_SIZE will be zero. */
1561 pushtag (location_t loc, tree name, tree type)
1563 /* Record the identifier as the type's name if it has none. */
1564 if (name && !TYPE_NAME (type))
1565 TYPE_NAME (type) = name;
1566 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc);
1568 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1569 tagged type we just added to the current scope. This fake
1570 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1571 to output a representation of a tagged type, and it also gives
1572 us a convenient place to record the "scope start" address for the
1575 TYPE_STUB_DECL (type) = pushdecl (build_decl (loc,
1576 TYPE_DECL, NULL_TREE, type));
1578 /* An approximation for now, so we can tell this is a function-scope tag.
1579 This will be updated in pop_scope. */
1580 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1582 if (warn_cxx_compat && name != NULL_TREE)
1584 struct c_binding *b = I_SYMBOL_BINDING (name);
1587 && b->decl != NULL_TREE
1588 && TREE_CODE (b->decl) == TYPE_DECL
1589 && (B_IN_CURRENT_SCOPE (b)
1590 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
1591 && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl))
1592 != TYPE_MAIN_VARIANT (type)))
1594 auto_diagnostic_group d;
1595 if (warning_at (loc, OPT_Wc___compat,
1596 ("using %qD as both a typedef and a tag is "
1597 "invalid in C++"), b->decl)
1598 && b->locus != UNKNOWN_LOCATION)
1599 inform (b->locus, "originally defined here");
1604 /* An exported interface to pushtag. This is used by the gdb plugin's
1605 binding oracle to introduce a new tag binding. */
1608 c_pushtag (location_t loc, tree name, tree type)
1610 pushtag (loc, name, type);
1613 /* An exported interface to bind a declaration. LOC is the location
1614 to use. DECL is the declaration to bind. The decl's name is used
1615 to determine how it is bound. If DECL is a VAR_DECL, then
1616 IS_GLOBAL determines whether the decl is put into the global (file
1617 and external) scope or the current function's scope; if DECL is not
1618 a VAR_DECL then it is always put into the file scope. */
1621 c_bind (location_t loc, tree decl, bool is_global)
1623 struct c_scope *scope;
1624 bool nested = false;
1626 if (!VAR_P (decl) || current_function_scope == NULL)
1628 /* Types and functions are always considered to be global. */
1630 DECL_EXTERNAL (decl) = 1;
1631 TREE_PUBLIC (decl) = 1;
1635 /* Also bind it into the external scope. */
1636 bind (DECL_NAME (decl), decl, external_scope, true, false, loc);
1639 DECL_EXTERNAL (decl) = 1;
1640 TREE_PUBLIC (decl) = 1;
1644 DECL_CONTEXT (decl) = current_function_decl;
1645 TREE_PUBLIC (decl) = 0;
1646 scope = current_function_scope;
1649 bind (DECL_NAME (decl), decl, scope, false, nested, loc);
1653 /* Stores the first FILE*, const struct tm* etc. argument type (whatever
1654 it is) seen in a declaration of a file I/O etc. built-in, corresponding
1655 to the builtin_structptr_types array. Subsequent declarations of such
1656 built-ins are expected to refer to it rather than to fileptr_type_node,
1657 etc. which is just void* (or to any other type).
1658 Used only by match_builtin_function_types. */
1660 static const unsigned builtin_structptr_type_count
1661 = ARRAY_SIZE (builtin_structptr_types);
1663 static GTY(()) tree last_structptr_types[builtin_structptr_type_count];
1665 /* Returns true if types T1 and T2 representing return types or types
1666 of function arguments are close enough to be considered interchangeable
1667 in redeclarations of built-in functions. */
1670 types_close_enough_to_match (tree t1, tree t2)
1672 return (TYPE_MODE (t1) == TYPE_MODE (t2)
1673 && POINTER_TYPE_P (t1) == POINTER_TYPE_P (t2)
1674 && FUNCTION_POINTER_TYPE_P (t1) == FUNCTION_POINTER_TYPE_P (t2));
1677 /* Subroutine of compare_decls. Allow harmless mismatches in return
1678 and argument types provided that the type modes match. Set *STRICT
1679 and *ARGNO to the expected argument type and number in case of
1680 an argument type mismatch or null and zero otherwise. Return
1681 a unified type given a suitable match, and 0 otherwise. */
1684 match_builtin_function_types (tree newtype, tree oldtype,
1685 tree *strict, unsigned *argno)
1688 *strict = NULL_TREE;
1690 /* Accept the return type of the new declaration if it has the same
1691 mode and if they're both pointers or if neither is. */
1692 tree oldrettype = TREE_TYPE (oldtype);
1693 tree newrettype = TREE_TYPE (newtype);
1695 if (!types_close_enough_to_match (oldrettype, newrettype))
1698 /* Check that the return types are compatible but don't fail if they
1699 are not (e.g., int vs long in ILP32) and just let the caller know. */
1700 if (!comptypes (TYPE_MAIN_VARIANT (oldrettype),
1701 TYPE_MAIN_VARIANT (newrettype)))
1702 *strict = oldrettype;
1704 tree oldargs = TYPE_ARG_TYPES (oldtype);
1705 tree newargs = TYPE_ARG_TYPES (newtype);
1706 tree tryargs = newargs;
1708 const unsigned nlst = ARRAY_SIZE (last_structptr_types);
1709 const unsigned nbst = ARRAY_SIZE (builtin_structptr_types);
1711 gcc_checking_assert (nlst == nbst);
1713 for (unsigned i = 1; oldargs || newargs; ++i)
1717 || !TREE_VALUE (oldargs)
1718 || !TREE_VALUE (newargs))
1721 tree oldtype = TYPE_MAIN_VARIANT (TREE_VALUE (oldargs));
1722 tree newtype = TREE_VALUE (newargs);
1723 if (newtype == error_mark_node)
1725 newtype = TYPE_MAIN_VARIANT (newtype);
1727 if (!types_close_enough_to_match (oldtype, newtype))
1731 if (POINTER_TYPE_P (oldtype))
1732 /* Iterate over well-known struct types like FILE (whose types
1733 aren't known to us) and compare the pointer to each to
1734 the pointer argument. */
1735 for (j = 0; j < nbst; ++j)
1737 if (TREE_VALUE (oldargs) != builtin_structptr_types[j].node)
1739 /* Store the first FILE* etc. argument type (whatever it is), and
1740 expect any subsequent declarations of file I/O etc. built-ins
1741 to refer to it rather than to fileptr_type_node etc. which is
1742 just void* (or const void*). */
1743 if (last_structptr_types[j])
1745 if (!comptypes (last_structptr_types[j], newtype))
1748 *strict = last_structptr_types[j];
1752 last_structptr_types[j] = newtype;
1756 if (j == nbst && !comptypes (oldtype, newtype))
1758 if (POINTER_TYPE_P (oldtype))
1760 /* For incompatible pointers, only reject differences in
1761 the unqualified variants of the referenced types but
1762 consider differences in qualifiers as benign (report
1763 those to caller via *STRICT below). */
1764 tree oldref = TYPE_MAIN_VARIANT (TREE_TYPE (oldtype));
1765 tree newref = TYPE_MAIN_VARIANT (TREE_TYPE (newtype));
1766 if (!comptypes (oldref, newref))
1777 oldargs = TREE_CHAIN (oldargs);
1778 newargs = TREE_CHAIN (newargs);
1781 tree trytype = build_function_type (newrettype, tryargs);
1783 /* Allow declaration to change transaction_safe attribute. */
1784 tree oldattrs = TYPE_ATTRIBUTES (oldtype);
1785 tree oldtsafe = lookup_attribute ("transaction_safe", oldattrs);
1786 tree newattrs = TYPE_ATTRIBUTES (newtype);
1787 tree newtsafe = lookup_attribute ("transaction_safe", newattrs);
1788 if (oldtsafe && !newtsafe)
1789 oldattrs = remove_attribute ("transaction_safe", oldattrs);
1790 else if (newtsafe && !oldtsafe)
1791 oldattrs = tree_cons (get_identifier ("transaction_safe"),
1792 NULL_TREE, oldattrs);
1794 return build_type_attribute_variant (trytype, oldattrs);
1797 /* Subroutine of diagnose_mismatched_decls. Check for function type
1798 mismatch involving an empty arglist vs a nonempty one and give clearer
1801 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1802 tree newtype, tree oldtype)
1806 if (TREE_CODE (olddecl) != FUNCTION_DECL
1807 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1808 || !((!prototype_p (oldtype) && DECL_INITIAL (olddecl) == NULL_TREE)
1809 || (!prototype_p (newtype) && DECL_INITIAL (newdecl) == NULL_TREE)))
1812 t = TYPE_ARG_TYPES (oldtype);
1814 t = TYPE_ARG_TYPES (newtype);
1815 for (; t; t = TREE_CHAIN (t))
1817 tree type = TREE_VALUE (t);
1819 if (TREE_CHAIN (t) == NULL_TREE
1820 && TYPE_MAIN_VARIANT (type) != void_type_node)
1822 inform (input_location, "a parameter list with an ellipsis "
1823 "cannot match an empty parameter name list declaration");
1827 if (c_type_promotes_to (type) != type)
1829 inform (input_location, "an argument type that has a default "
1830 "promotion cannot match an empty parameter name list "
1837 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1838 old-style function definition, NEWDECL is a prototype declaration.
1839 Diagnose inconsistencies in the argument list. Returns TRUE if
1840 the prototype is compatible, FALSE if not. */
1842 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1844 tree newargs, oldargs;
1847 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1849 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1850 newargs = TYPE_ARG_TYPES (newtype);
1855 tree oldargtype = TREE_VALUE (oldargs);
1856 tree newargtype = TREE_VALUE (newargs);
1858 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1861 oldargtype = (TYPE_ATOMIC (oldargtype)
1862 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype),
1864 : TYPE_MAIN_VARIANT (oldargtype));
1865 newargtype = (TYPE_ATOMIC (newargtype)
1866 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype),
1868 : TYPE_MAIN_VARIANT (newargtype));
1870 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1873 /* Reaching the end of just one list means the two decls don't
1874 agree on the number of arguments. */
1875 if (END_OF_ARGLIST (oldargtype))
1877 error ("prototype for %q+D declares more arguments "
1878 "than previous old-style definition", newdecl);
1881 else if (END_OF_ARGLIST (newargtype))
1883 error ("prototype for %q+D declares fewer arguments "
1884 "than previous old-style definition", newdecl);
1888 /* Type for passing arg must be consistent with that declared
1890 else if (!comptypes (oldargtype, newargtype))
1892 error ("prototype for %q+D declares argument %d"
1893 " with incompatible type",
1898 oldargs = TREE_CHAIN (oldargs);
1899 newargs = TREE_CHAIN (newargs);
1903 /* If we get here, no errors were found, but do issue a warning
1904 for this poor-style construct. */
1905 warning (0, "prototype for %q+D follows non-prototype definition",
1908 #undef END_OF_ARGLIST
1911 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1912 first in a pair of mismatched declarations, using the diagnostic
1915 locate_old_decl (tree decl)
1917 if (TREE_CODE (decl) == FUNCTION_DECL
1918 && fndecl_built_in_p (decl)
1919 && !C_DECL_DECLARED_BUILTIN (decl))
1921 else if (DECL_INITIAL (decl))
1922 inform (input_location,
1923 "previous definition of %q+D with type %qT",
1924 decl, TREE_TYPE (decl));
1925 else if (C_DECL_IMPLICIT (decl))
1926 inform (input_location,
1927 "previous implicit declaration of %q+D with type %qT",
1928 decl, TREE_TYPE (decl));
1930 inform (input_location,
1931 "previous declaration of %q+D with type %qT",
1932 decl, TREE_TYPE (decl));
1935 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1936 Returns true if the caller should proceed to merge the two, false
1937 if OLDDECL should simply be discarded. As a side effect, issues
1938 all necessary diagnostics for invalid or poor-style combinations.
1939 If it returns true, writes the types of NEWDECL and OLDDECL to
1940 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1941 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1944 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1945 tree *newtypep, tree *oldtypep)
1947 tree newtype, oldtype;
1950 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1951 && DECL_EXTERNAL (DECL))
1953 /* If we have error_mark_node for either decl or type, just discard
1954 the previous decl - we're in an error cascade already. */
1955 if (olddecl == error_mark_node || newdecl == error_mark_node)
1957 *oldtypep = oldtype = TREE_TYPE (olddecl);
1958 *newtypep = newtype = TREE_TYPE (newdecl);
1959 if (oldtype == error_mark_node || newtype == error_mark_node)
1962 /* Two different categories of symbol altogether. This is an error
1963 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1964 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1966 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1967 && fndecl_built_in_p (olddecl)
1968 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1970 auto_diagnostic_group d;
1971 error ("%q+D redeclared as different kind of symbol", newdecl);
1972 locate_old_decl (olddecl);
1974 else if (TREE_PUBLIC (newdecl))
1975 warning (OPT_Wbuiltin_declaration_mismatch,
1976 "built-in function %q+D declared as non-function",
1979 warning (OPT_Wshadow, "declaration of %q+D shadows "
1980 "a built-in function", newdecl);
1984 /* Enumerators have no linkage, so may only be declared once in a
1986 if (TREE_CODE (olddecl) == CONST_DECL)
1988 auto_diagnostic_group d;
1989 error ("redeclaration of enumerator %q+D", newdecl);
1990 locate_old_decl (olddecl);
1994 bool pedwarned = false;
1995 bool warned = false;
1996 bool enum_and_int_p = false;
1997 auto_diagnostic_group d;
1999 int comptypes_result = comptypes_check_enum_int (oldtype, newtype,
2001 if (!comptypes_result)
2003 if (TREE_CODE (olddecl) == FUNCTION_DECL
2004 && fndecl_built_in_p (olddecl, BUILT_IN_NORMAL)
2005 && !C_DECL_DECLARED_BUILTIN (olddecl))
2007 /* Accept "harmless" mismatches in function types such
2008 as missing qualifiers or int vs long when they're the same
2009 size. However, diagnose return and argument types that are
2010 incompatible according to language rules. */
2011 tree mismatch_expect;
2012 unsigned mismatch_argno;
2014 tree trytype = match_builtin_function_types (newtype, oldtype,
2018 if (trytype && comptypes (newtype, trytype))
2019 *oldtypep = oldtype = trytype;
2022 /* If types don't match for a built-in, throw away the
2023 built-in. No point in calling locate_old_decl here, it
2024 won't print anything. */
2025 const char *header = header_for_builtin_fn (olddecl);
2026 location_t loc = DECL_SOURCE_LOCATION (newdecl);
2027 if (warning_at (loc, OPT_Wbuiltin_declaration_mismatch,
2028 "conflicting types for built-in function %q+D; "
2033 /* Suggest the right header to include as the preferred
2034 solution rather than the spelling of the declaration. */
2035 rich_location richloc (line_table, loc);
2036 maybe_add_include_fixit (&richloc, header, true);
2038 "%qD is declared in header %qs", olddecl, header);
2043 if (mismatch_expect && extra_warnings)
2045 location_t newloc = DECL_SOURCE_LOCATION (newdecl);
2046 bool warned = false;
2048 warned = warning_at (newloc, OPT_Wbuiltin_declaration_mismatch,
2049 "mismatch in argument %u type of built-in "
2050 "function %qD; expected %qT",
2051 mismatch_argno, newdecl, mismatch_expect);
2053 warned = warning_at (newloc, OPT_Wbuiltin_declaration_mismatch,
2054 "mismatch in return type of built-in "
2055 "function %qD; expected %qT",
2056 newdecl, mismatch_expect);
2057 const char *header = header_for_builtin_fn (olddecl);
2058 if (warned && header)
2060 rich_location richloc (line_table, newloc);
2061 maybe_add_include_fixit (&richloc, header, true);
2063 "%qD is declared in header %qs", olddecl, header);
2067 else if (TREE_CODE (olddecl) == FUNCTION_DECL
2068 && DECL_IS_UNDECLARED_BUILTIN (olddecl))
2070 /* A conflicting function declaration for a predeclared
2071 function that isn't actually built in. Objective C uses
2072 these. The new declaration silently overrides everything
2073 but the volatility (i.e. noreturn) indication. See also
2074 below. FIXME: Make Objective C use normal builtins. */
2075 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2078 /* Permit void foo (...) to match int foo (...) if the latter is
2079 the definition and implicit int was used. See
2080 c-torture/compile/920625-2.c. */
2081 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
2082 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
2083 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
2084 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
2086 pedwarned = pedwarn (input_location, 0,
2087 "conflicting types for %q+D", newdecl);
2088 /* Make sure we keep void as the return type. */
2089 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
2090 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
2092 /* Permit void foo (...) to match an earlier call to foo (...) with
2093 no declared type (thus, implicitly int). */
2094 else if (TREE_CODE (newdecl) == FUNCTION_DECL
2095 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
2096 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
2097 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
2099 pedwarned = pedwarn (input_location, 0,
2100 "conflicting types for %q+D; have %qT",
2102 /* Make sure we keep void as the return type. */
2103 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
2107 int new_quals = TYPE_QUALS (newtype);
2108 int old_quals = TYPE_QUALS (oldtype);
2110 if (new_quals != old_quals)
2112 addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals);
2113 addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals);
2114 if (new_addr != old_addr)
2116 if (ADDR_SPACE_GENERIC_P (new_addr))
2117 error ("conflicting named address spaces (generic vs %s) "
2119 c_addr_space_name (old_addr), newdecl);
2120 else if (ADDR_SPACE_GENERIC_P (old_addr))
2121 error ("conflicting named address spaces (%s vs generic) "
2123 c_addr_space_name (new_addr), newdecl);
2125 error ("conflicting named address spaces (%s vs %s) "
2127 c_addr_space_name (new_addr),
2128 c_addr_space_name (old_addr),
2132 if (CLEAR_QUAL_ADDR_SPACE (new_quals)
2133 != CLEAR_QUAL_ADDR_SPACE (old_quals))
2134 error ("conflicting type qualifiers for %q+D", newdecl);
2137 error ("conflicting types for %q+D; have %qT", newdecl, newtype);
2138 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
2139 locate_old_decl (olddecl);
2143 /* Warn about enum/integer type mismatches. They are compatible types
2144 (C2X 6.7.2.2/5), but may pose portability problems. */
2145 else if (enum_and_int_p && TREE_CODE (newdecl) != TYPE_DECL)
2146 warned = warning_at (DECL_SOURCE_LOCATION (newdecl),
2147 OPT_Wenum_int_mismatch,
2148 "conflicting types for %q+D due to enum/integer "
2149 "mismatch; have %qT", newdecl, newtype);
2151 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
2152 but silently ignore the redeclaration if either is in a system
2153 header. (Conflicting redeclarations were handled above.) This
2154 is allowed for C11 if the types are the same, not just
2156 if (TREE_CODE (newdecl) == TYPE_DECL)
2158 bool types_different = false;
2161 = comptypes_check_different_types (oldtype, newtype, &types_different);
2163 if (comptypes_result != 1 || types_different)
2165 error ("redefinition of typedef %q+D with different type", newdecl);
2166 locate_old_decl (olddecl);
2170 if (DECL_IN_SYSTEM_HEADER (newdecl)
2171 || DECL_IN_SYSTEM_HEADER (olddecl)
2172 || warning_suppressed_p (newdecl, OPT_Wpedantic)
2173 || warning_suppressed_p (olddecl, OPT_Wpedantic))
2174 return true; /* Allow OLDDECL to continue in use. */
2176 if (variably_modified_type_p (newtype, NULL))
2178 error ("redefinition of typedef %q+D with variably modified type",
2180 locate_old_decl (olddecl);
2182 else if (pedwarn_c99 (input_location, OPT_Wpedantic,
2183 "redefinition of typedef %q+D", newdecl))
2184 locate_old_decl (olddecl);
2189 /* Function declarations can either be 'static' or 'extern' (no
2190 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
2191 can never conflict with each other on account of linkage
2192 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
2193 gnu89 mode permits two definitions if one is 'extern inline' and
2194 one is not. The non- extern-inline definition supersedes the
2195 extern-inline definition. */
2197 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2199 /* If you declare a built-in function name as static, or
2200 define the built-in with an old-style definition (so we
2201 can't validate the argument list) the built-in definition is
2202 overridden, but optionally warn this was a bad choice of name. */
2203 if (fndecl_built_in_p (olddecl)
2204 && !C_DECL_DECLARED_BUILTIN (olddecl))
2206 if (!TREE_PUBLIC (newdecl)
2207 || (DECL_INITIAL (newdecl)
2208 && !prototype_p (TREE_TYPE (newdecl))))
2210 warning_at (DECL_SOURCE_LOCATION (newdecl),
2211 OPT_Wshadow, "declaration of %qD shadows "
2212 "a built-in function", newdecl);
2213 /* Discard the old built-in function. */
2217 if (!prototype_p (TREE_TYPE (newdecl)))
2219 /* Set for built-ins that take no arguments. */
2220 bool func_void_args = false;
2221 if (tree at = TYPE_ARG_TYPES (oldtype))
2222 func_void_args = VOID_TYPE_P (TREE_VALUE (at));
2224 if (extra_warnings && !func_void_args)
2225 warning_at (DECL_SOURCE_LOCATION (newdecl),
2226 OPT_Wbuiltin_declaration_mismatch,
2227 "declaration of built-in function %qD without "
2228 "a prototype; expected %qT",
2229 newdecl, TREE_TYPE (olddecl));
2233 if (DECL_INITIAL (newdecl))
2235 if (DECL_INITIAL (olddecl))
2237 /* If both decls are in the same TU and the new declaration
2238 isn't overriding an extern inline reject the new decl.
2239 In c99, no overriding is allowed in the same translation
2241 if ((!DECL_EXTERN_INLINE (olddecl)
2242 || DECL_EXTERN_INLINE (newdecl)
2243 || (!flag_gnu89_inline
2244 && (!DECL_DECLARED_INLINE_P (olddecl)
2245 || !lookup_attribute ("gnu_inline",
2246 DECL_ATTRIBUTES (olddecl)))
2247 && (!DECL_DECLARED_INLINE_P (newdecl)
2248 || !lookup_attribute ("gnu_inline",
2249 DECL_ATTRIBUTES (newdecl))))
2251 && same_translation_unit_p (newdecl, olddecl))
2253 auto_diagnostic_group d;
2254 error ("redefinition of %q+D", newdecl);
2255 locate_old_decl (olddecl);
2260 /* If we have a prototype after an old-style function definition,
2261 the argument types must be checked specially. */
2262 else if (DECL_INITIAL (olddecl)
2263 && !prototype_p (oldtype) && prototype_p (newtype)
2264 && TYPE_ACTUAL_ARG_TYPES (oldtype))
2266 auto_diagnostic_group d;
2267 if (!validate_proto_after_old_defn (newdecl, newtype, oldtype))
2269 locate_old_decl (olddecl);
2273 /* A non-static declaration (even an "extern") followed by a
2274 static declaration is undefined behavior per C99 6.2.2p3-5,7.
2275 The same is true for a static forward declaration at block
2276 scope followed by a non-static declaration/definition at file
2277 scope. Static followed by non-static at the same scope is
2278 not undefined behavior, and is the most convenient way to get
2279 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
2280 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
2281 we do diagnose it if -Wtraditional. */
2282 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
2284 /* Two exceptions to the rule. If olddecl is an extern
2285 inline, or a predeclared function that isn't actually
2286 built in, newdecl silently overrides olddecl. The latter
2287 occur only in Objective C; see also above. (FIXME: Make
2288 Objective C use normal builtins.) */
2289 if (!DECL_IS_UNDECLARED_BUILTIN (olddecl)
2290 && !DECL_EXTERN_INLINE (olddecl))
2292 auto_diagnostic_group d;
2293 error ("static declaration of %q+D follows "
2294 "non-static declaration", newdecl);
2295 locate_old_decl (olddecl);
2299 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
2301 if (DECL_CONTEXT (olddecl))
2303 auto_diagnostic_group d;
2304 error ("non-static declaration of %q+D follows "
2305 "static declaration", newdecl);
2306 locate_old_decl (olddecl);
2309 else if (warn_traditional)
2311 warned |= warning (OPT_Wtraditional,
2312 "non-static declaration of %q+D "
2313 "follows static declaration", newdecl);
2317 /* Make sure gnu_inline attribute is either not present, or
2318 present on all inline decls. */
2319 if (DECL_DECLARED_INLINE_P (olddecl)
2320 && DECL_DECLARED_INLINE_P (newdecl))
2322 bool newa = lookup_attribute ("gnu_inline",
2323 DECL_ATTRIBUTES (newdecl)) != NULL;
2324 bool olda = lookup_attribute ("gnu_inline",
2325 DECL_ATTRIBUTES (olddecl)) != NULL;
2328 auto_diagnostic_group d;
2329 error_at (input_location, "%<gnu_inline%> attribute present on %q+D",
2330 newa ? newdecl : olddecl);
2331 error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl),
2336 else if (VAR_P (newdecl))
2338 /* Only variables can be thread-local, and all declarations must
2339 agree on this property. */
2340 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
2342 /* Nothing to check. Since OLDDECL is marked threadprivate
2343 and NEWDECL does not have a thread-local attribute, we
2344 will merge the threadprivate attribute into NEWDECL. */
2347 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
2349 auto_diagnostic_group d;
2350 if (DECL_THREAD_LOCAL_P (newdecl))
2351 error ("thread-local declaration of %q+D follows "
2352 "non-thread-local declaration", newdecl);
2354 error ("non-thread-local declaration of %q+D follows "
2355 "thread-local declaration", newdecl);
2357 locate_old_decl (olddecl);
2361 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2362 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
2364 auto_diagnostic_group d;
2365 error ("redefinition of %q+D", newdecl);
2366 locate_old_decl (olddecl);
2370 /* Objects declared at file scope: if the first declaration had
2371 external linkage (even if it was an external reference) the
2372 second must have external linkage as well, or the behavior is
2373 undefined. If the first declaration had internal linkage, then
2374 the second must too, or else be an external reference (in which
2375 case the composite declaration still has internal linkage).
2376 As for function declarations, we warn about the static-then-
2377 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2378 if (DECL_FILE_SCOPE_P (newdecl)
2379 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
2381 if (DECL_EXTERNAL (newdecl))
2383 if (!DECL_FILE_SCOPE_P (olddecl))
2385 auto_diagnostic_group d;
2386 error ("extern declaration of %q+D follows "
2387 "declaration with no linkage", newdecl);
2388 locate_old_decl (olddecl);
2391 else if (warn_traditional)
2393 warned |= warning (OPT_Wtraditional,
2394 "non-static declaration of %q+D "
2395 "follows static declaration", newdecl);
2400 auto_diagnostic_group d;
2401 if (TREE_PUBLIC (newdecl))
2402 error ("non-static declaration of %q+D follows "
2403 "static declaration", newdecl);
2405 error ("static declaration of %q+D follows "
2406 "non-static declaration", newdecl);
2408 locate_old_decl (olddecl);
2412 /* Two objects with the same name declared at the same block
2413 scope must both be external references (6.7p3). */
2414 else if (!DECL_FILE_SCOPE_P (newdecl))
2416 if (DECL_EXTERNAL (newdecl))
2418 /* Extern with initializer at block scope, which will
2419 already have received an error. */
2421 else if (DECL_EXTERNAL (olddecl))
2423 auto_diagnostic_group d;
2424 error ("declaration of %q+D with no linkage follows "
2425 "extern declaration", newdecl);
2426 locate_old_decl (olddecl);
2430 auto_diagnostic_group d;
2431 error ("redeclaration of %q+D with no linkage", newdecl);
2432 locate_old_decl (olddecl);
2438 /* C++ does not permit a decl to appear multiple times at file
2441 && DECL_FILE_SCOPE_P (newdecl)
2442 && !DECL_EXTERNAL (newdecl)
2443 && !DECL_EXTERNAL (olddecl))
2444 warned |= warning_at (DECL_SOURCE_LOCATION (newdecl),
2446 ("duplicate declaration of %qD is "
2452 /* All decls must agree on a visibility. */
2453 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
2454 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
2455 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2457 warned |= warning (0, "redeclaration of %q+D with different visibility "
2458 "(old visibility preserved)", newdecl);
2461 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2462 warned |= diagnose_mismatched_attributes (olddecl, newdecl);
2463 else /* PARM_DECL, VAR_DECL */
2465 /* Redeclaration of a parameter is a constraint violation (this is
2466 not explicitly stated, but follows from C99 6.7p3 [no more than
2467 one declaration of the same identifier with no linkage in the
2468 same scope, except type tags] and 6.2.2p6 [parameters have no
2469 linkage]). We must check for a forward parameter declaration,
2470 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2471 an extension, the mandatory diagnostic for which is handled by
2472 mark_forward_parm_decls. */
2474 if (TREE_CODE (newdecl) == PARM_DECL
2475 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
2477 auto_diagnostic_group d;
2478 error ("redefinition of parameter %q+D", newdecl);
2479 locate_old_decl (olddecl);
2484 /* Optional warning for completely redundant decls. */
2485 if (!warned && !pedwarned
2486 && warn_redundant_decls
2487 /* Don't warn about a function declaration followed by a
2489 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2490 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
2491 /* Don't warn about redundant redeclarations of builtins. */
2492 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2493 && !fndecl_built_in_p (newdecl)
2494 && fndecl_built_in_p (olddecl)
2495 && !C_DECL_DECLARED_BUILTIN (olddecl))
2496 /* Don't warn about an extern followed by a definition. */
2497 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
2498 /* Don't warn about forward parameter decls. */
2499 && !(TREE_CODE (newdecl) == PARM_DECL
2500 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2501 /* Don't warn about a variable definition following a declaration. */
2502 && !(VAR_P (newdecl)
2503 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
2505 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
2509 /* Report location of previous decl/defn. */
2510 if (warned || pedwarned)
2511 locate_old_decl (olddecl);
2513 #undef DECL_EXTERN_INLINE
2518 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2519 consistent with OLDDECL, but carries new information. Merge the
2520 new information into OLDDECL. This function issues no
2524 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
2526 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
2527 && DECL_INITIAL (newdecl) != NULL_TREE);
2528 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
2529 && prototype_p (TREE_TYPE (newdecl)));
2530 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
2531 && prototype_p (TREE_TYPE (olddecl)));
2533 /* For real parm decl following a forward decl, rechain the old decl
2534 in its new location and clear TREE_ASM_WRITTEN (it's not a
2535 forward decl anymore). */
2536 if (TREE_CODE (newdecl) == PARM_DECL
2537 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2539 struct c_binding *b, **here;
2541 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
2542 if ((*here)->decl == olddecl)
2549 b->prev = current_scope->bindings;
2550 current_scope->bindings = b;
2552 TREE_ASM_WRITTEN (olddecl) = 0;
2555 DECL_ATTRIBUTES (newdecl)
2556 = targetm.merge_decl_attributes (olddecl, newdecl);
2558 /* For typedefs use the old type, as the new type's DECL_NAME points
2559 at newdecl, which will be ggc_freed. */
2560 if (TREE_CODE (newdecl) == TYPE_DECL)
2562 /* But NEWTYPE might have an attribute, honor that. */
2566 if (TYPE_USER_ALIGN (tem))
2568 if (TYPE_ALIGN (tem) > TYPE_ALIGN (newtype))
2569 SET_TYPE_ALIGN (newtype, TYPE_ALIGN (tem));
2570 TYPE_USER_ALIGN (newtype) = true;
2573 /* And remove the new type from the variants list. */
2574 if (TYPE_NAME (TREE_TYPE (newdecl)) == newdecl)
2576 tree remove = TREE_TYPE (newdecl);
2577 if (TYPE_MAIN_VARIANT (remove) == remove)
2579 gcc_assert (TYPE_NEXT_VARIANT (remove) == NULL_TREE);
2580 /* If remove is the main variant, no need to remove that
2581 from the list. One of the DECL_ORIGINAL_TYPE
2582 variants, e.g. created for aligned attribute, might still
2583 refer to the newdecl TYPE_DECL though, so remove that one
2585 if (DECL_ORIGINAL_TYPE (newdecl)
2586 && DECL_ORIGINAL_TYPE (newdecl) != remove)
2587 for (tree t = TYPE_MAIN_VARIANT (DECL_ORIGINAL_TYPE (newdecl));
2588 t; t = TYPE_MAIN_VARIANT (t))
2589 if (TYPE_NAME (TYPE_NEXT_VARIANT (t)) == newdecl)
2591 TYPE_NEXT_VARIANT (t)
2592 = TYPE_NEXT_VARIANT (TYPE_NEXT_VARIANT (t));
2597 for (tree t = TYPE_MAIN_VARIANT (remove); ;
2598 t = TYPE_NEXT_VARIANT (t))
2599 if (TYPE_NEXT_VARIANT (t) == remove)
2601 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (remove);
2607 /* Merge the data types specified in the two decls. */
2609 = TREE_TYPE (olddecl)
2610 = composite_type (newtype, oldtype);
2612 /* Lay the type out, unless already done. */
2613 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
2615 if (TREE_TYPE (newdecl) != error_mark_node)
2616 layout_type (TREE_TYPE (newdecl));
2617 if (TREE_CODE (newdecl) != FUNCTION_DECL
2618 && TREE_CODE (newdecl) != TYPE_DECL
2619 && TREE_CODE (newdecl) != CONST_DECL)
2620 layout_decl (newdecl, 0);
2624 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2625 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
2626 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
2627 SET_DECL_MODE (newdecl, DECL_MODE (olddecl));
2628 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2630 SET_DECL_ALIGN (newdecl, DECL_ALIGN (olddecl));
2631 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2633 else if (DECL_ALIGN (olddecl) == DECL_ALIGN (newdecl)
2634 && DECL_USER_ALIGN (olddecl) != DECL_USER_ALIGN (newdecl))
2635 DECL_USER_ALIGN (newdecl) = 1;
2636 if (DECL_WARN_IF_NOT_ALIGN (olddecl)
2637 > DECL_WARN_IF_NOT_ALIGN (newdecl))
2638 SET_DECL_WARN_IF_NOT_ALIGN (newdecl,
2639 DECL_WARN_IF_NOT_ALIGN (olddecl));
2642 /* Keep the old rtl since we can safely use it. */
2643 if (HAS_RTL_P (olddecl))
2644 COPY_DECL_RTL (olddecl, newdecl);
2646 /* Merge the type qualifiers. */
2647 if (TREE_READONLY (newdecl))
2648 TREE_READONLY (olddecl) = 1;
2650 if (TREE_THIS_VOLATILE (newdecl))
2651 TREE_THIS_VOLATILE (olddecl) = 1;
2653 /* Merge deprecatedness. */
2654 if (TREE_DEPRECATED (newdecl))
2655 TREE_DEPRECATED (olddecl) = 1;
2657 /* Merge unavailability. */
2658 if (TREE_UNAVAILABLE (newdecl))
2659 TREE_UNAVAILABLE (olddecl) = 1;
2661 /* If a decl is in a system header and the other isn't, keep the one on the
2662 system header. Otherwise, keep source location of definition rather than
2663 declaration and of prototype rather than non-prototype unless that
2664 prototype is built-in. */
2665 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2666 && DECL_IN_SYSTEM_HEADER (olddecl)
2667 && !DECL_IN_SYSTEM_HEADER (newdecl) )
2668 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2669 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2670 && DECL_IN_SYSTEM_HEADER (newdecl)
2671 && !DECL_IN_SYSTEM_HEADER (olddecl))
2672 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
2673 else if ((DECL_INITIAL (newdecl) == NULL_TREE
2674 && DECL_INITIAL (olddecl) != NULL_TREE)
2675 || (old_is_prototype && !new_is_prototype
2676 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
2677 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2679 /* Merge the initialization information. */
2680 if (DECL_INITIAL (newdecl) == NULL_TREE)
2681 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2683 /* Merge the threadprivate attribute. */
2684 if (VAR_P (olddecl) && C_DECL_THREADPRIVATE_P (olddecl))
2685 C_DECL_THREADPRIVATE_P (newdecl) = 1;
2687 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
2689 /* Copy the assembler name.
2690 Currently, it can only be defined in the prototype. */
2691 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2693 /* Use visibility of whichever declaration had it specified */
2694 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2696 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2697 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2700 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2702 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2703 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2704 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2705 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2706 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2707 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2708 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2709 if (DECL_IS_OPERATOR_NEW_P (olddecl))
2710 DECL_SET_IS_OPERATOR_NEW (newdecl, true);
2711 if (DECL_IS_OPERATOR_DELETE_P (olddecl))
2712 DECL_SET_IS_OPERATOR_DELETE (newdecl, true);
2713 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2714 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2715 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
2718 /* Merge the storage class information. */
2719 merge_weak (newdecl, olddecl);
2721 /* For functions, static overrides non-static. */
2722 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2724 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2725 /* This is since we don't automatically
2726 copy the attributes of NEWDECL into OLDDECL. */
2727 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2728 /* If this clears `static', clear it in the identifier too. */
2729 if (!TREE_PUBLIC (olddecl))
2730 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2734 /* In c99, 'extern' declaration before (or after) 'inline' means this
2735 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2737 if (TREE_CODE (newdecl) == FUNCTION_DECL
2738 && !flag_gnu89_inline
2739 && (DECL_DECLARED_INLINE_P (newdecl)
2740 || DECL_DECLARED_INLINE_P (olddecl))
2741 && (!DECL_DECLARED_INLINE_P (newdecl)
2742 || !DECL_DECLARED_INLINE_P (olddecl)
2743 || !DECL_EXTERNAL (olddecl))
2744 && DECL_EXTERNAL (newdecl)
2745 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
2746 && !current_function_decl)
2747 DECL_EXTERNAL (newdecl) = 0;
2749 /* An inline definition following a static declaration is not
2751 if (new_is_definition
2752 && (DECL_DECLARED_INLINE_P (newdecl)
2753 || DECL_DECLARED_INLINE_P (olddecl))
2754 && !TREE_PUBLIC (olddecl))
2755 DECL_EXTERNAL (newdecl) = 0;
2757 if (DECL_EXTERNAL (newdecl))
2759 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2760 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2762 /* An extern decl does not override previous storage class. */
2763 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2764 if (!DECL_EXTERNAL (newdecl))
2766 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2767 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2772 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2773 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2776 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2778 /* If we're redefining a function previously defined as extern
2779 inline, make sure we emit debug info for the inline before we
2780 throw it away, in case it was inlined into a function that
2781 hasn't been written out yet. */
2782 if (new_is_definition && DECL_INITIAL (olddecl))
2783 /* The new defn must not be inline. */
2784 DECL_UNINLINABLE (newdecl) = 1;
2787 /* If either decl says `inline', this fn is inline, unless
2788 its definition was passed already. */
2789 if (DECL_DECLARED_INLINE_P (newdecl)
2790 || DECL_DECLARED_INLINE_P (olddecl))
2791 DECL_DECLARED_INLINE_P (newdecl) = 1;
2793 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2794 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2796 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2797 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2798 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2799 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2802 if (fndecl_built_in_p (olddecl))
2804 /* If redeclaring a builtin function, it stays built in.
2805 But it gets tagged as having been declared. */
2806 copy_decl_built_in_function (newdecl, olddecl);
2807 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
2808 if (new_is_prototype)
2810 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
2811 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2813 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2816 /* If a compatible prototype of these builtin functions
2817 is seen, assume the runtime implements it with the
2818 expected semantics. */
2819 case BUILT_IN_STPCPY:
2820 if (builtin_decl_explicit_p (fncode))
2821 set_builtin_decl_implicit_p (fncode, true);
2824 if (builtin_decl_explicit_p (fncode))
2825 set_builtin_decl_declared_p (fncode, true);
2829 copy_attributes_to_builtin (newdecl);
2833 C_DECL_BUILTIN_PROTOTYPE (newdecl)
2834 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
2837 /* Preserve function specific target and optimization options */
2838 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2839 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2840 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2841 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2843 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2844 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2845 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2846 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2848 /* Also preserve various other info from the definition. */
2849 if (!new_is_definition)
2852 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2853 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2854 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2855 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2856 DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl));
2857 for (t = DECL_ARGUMENTS (newdecl); t ; t = DECL_CHAIN (t))
2858 DECL_CONTEXT (t) = newdecl;
2860 /* See if we've got a function to instantiate from. */
2861 if (DECL_SAVED_TREE (olddecl))
2862 DECL_ABSTRACT_ORIGIN (newdecl)
2863 = DECL_ABSTRACT_ORIGIN (olddecl);
2867 /* Merge the USED information. */
2868 if (TREE_USED (olddecl))
2869 TREE_USED (newdecl) = 1;
2870 else if (TREE_USED (newdecl))
2871 TREE_USED (olddecl) = 1;
2872 if (VAR_P (olddecl) || TREE_CODE (olddecl) == PARM_DECL)
2873 DECL_READ_P (newdecl) |= DECL_READ_P (olddecl);
2874 if (DECL_PRESERVE_P (olddecl))
2875 DECL_PRESERVE_P (newdecl) = 1;
2876 else if (DECL_PRESERVE_P (newdecl))
2877 DECL_PRESERVE_P (olddecl) = 1;
2879 /* Merge DECL_COMMON */
2880 if (VAR_P (olddecl) && VAR_P (newdecl)
2881 && !lookup_attribute ("common", DECL_ATTRIBUTES (newdecl))
2882 && !lookup_attribute ("nocommon", DECL_ATTRIBUTES (newdecl)))
2883 DECL_COMMON (newdecl) = DECL_COMMON (newdecl) && DECL_COMMON (olddecl);
2885 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2886 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2887 DECL_ARGUMENTS (if appropriate). */
2889 unsigned olddecl_uid = DECL_UID (olddecl);
2890 tree olddecl_context = DECL_CONTEXT (olddecl);
2891 tree olddecl_arguments = NULL;
2892 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2893 olddecl_arguments = DECL_ARGUMENTS (olddecl);
2895 memcpy ((char *) olddecl + sizeof (struct tree_common),
2896 (char *) newdecl + sizeof (struct tree_common),
2897 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2898 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2899 switch (TREE_CODE (olddecl))
2904 struct symtab_node *snode = olddecl->decl_with_vis.symtab_node;
2906 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2907 (char *) newdecl + sizeof (struct tree_decl_common),
2908 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2909 olddecl->decl_with_vis.symtab_node = snode;
2911 if ((DECL_EXTERNAL (olddecl)
2912 || TREE_PUBLIC (olddecl)
2913 || TREE_STATIC (olddecl))
2914 && DECL_SECTION_NAME (newdecl) != NULL)
2915 set_decl_section_name (olddecl, newdecl);
2917 /* This isn't quite correct for something like
2918 int __thread x attribute ((tls_model ("local-exec")));
2919 extern int __thread x;
2920 as we'll lose the "local-exec" model. */
2921 if (VAR_P (olddecl) && DECL_THREAD_LOCAL_P (newdecl))
2922 set_decl_tls_model (olddecl, DECL_TLS_MODEL (newdecl));
2932 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2933 (char *) newdecl + sizeof (struct tree_decl_common),
2934 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2939 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2940 (char *) newdecl + sizeof (struct tree_decl_common),
2941 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
2943 DECL_UID (olddecl) = olddecl_uid;
2944 DECL_CONTEXT (olddecl) = olddecl_context;
2945 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2946 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
2949 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2950 so that encode_section_info has a chance to look at the new decl
2951 flags and attributes. */
2952 if (DECL_RTL_SET_P (olddecl)
2953 && (TREE_CODE (olddecl) == FUNCTION_DECL
2954 || (VAR_P (olddecl) && TREE_STATIC (olddecl))))
2955 make_decl_rtl (olddecl);
2958 /* Handle when a new declaration NEWDECL has the same name as an old
2959 one OLDDECL in the same binding contour. Prints an error message
2962 If safely possible, alter OLDDECL to look like NEWDECL, and return
2963 true. Otherwise, return false. */
2966 duplicate_decls (tree newdecl, tree olddecl)
2968 tree newtype = NULL, oldtype = NULL;
2970 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
2972 /* Avoid `unused variable' and other warnings for OLDDECL. */
2973 suppress_warning (olddecl, OPT_Wunused);
2974 /* If the types are completely different, poison them both with
2976 if (TREE_CODE (TREE_TYPE (newdecl)) != TREE_CODE (TREE_TYPE (olddecl))
2977 && olddecl != error_mark_node
2980 if (TREE_CODE (olddecl) != FUNCTION_DECL)
2981 TREE_TYPE (olddecl) = error_mark_node;
2982 if (TREE_CODE (newdecl) != FUNCTION_DECL)
2983 TREE_TYPE (newdecl) = error_mark_node;
2988 merge_decls (newdecl, olddecl, newtype, oldtype);
2990 /* The NEWDECL will no longer be needed.
2992 Before releasing the node, be sure to remove function from symbol
2993 table that might have been inserted there to record comdat group.
2994 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2995 structure is shared in between NEWDECL and OLDECL. */
2996 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2997 DECL_STRUCT_FUNCTION (newdecl) = NULL;
2998 if (VAR_OR_FUNCTION_DECL_P (newdecl))
3000 struct symtab_node *snode = symtab_node::get (newdecl);
3009 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
3011 warn_if_shadowing (tree new_decl)
3013 struct c_binding *b;
3015 /* Shadow warnings wanted? */
3017 || warn_shadow_local
3018 || warn_shadow_compatible_local)
3019 /* No shadow warnings for internally generated vars. */
3020 || DECL_IS_UNDECLARED_BUILTIN (new_decl))
3023 /* Is anything being shadowed? Invisible decls do not count. */
3024 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
3025 if (b->decl && b->decl != new_decl && !b->invisible
3026 && (b->decl == error_mark_node
3027 || diagnostic_report_warnings_p (global_dc,
3028 DECL_SOURCE_LOCATION (b->decl))))
3030 tree old_decl = b->decl;
3032 if (old_decl == error_mark_node)
3034 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
3035 "non-variable", new_decl);
3039 bool warned = false;
3040 auto_diagnostic_group d;
3041 if (TREE_CODE (old_decl) == PARM_DECL)
3043 enum opt_code warning_code;
3045 /* If '-Wshadow=compatible-local' is specified without other
3046 -Wshadow= flags, we will warn only when the types of the
3047 shadowing variable (i.e. new_decl) and the shadowed variable
3048 (old_decl) are compatible. */
3050 warning_code = OPT_Wshadow;
3051 else if (comptypes (TREE_TYPE (old_decl), TREE_TYPE (new_decl)))
3052 warning_code = OPT_Wshadow_compatible_local;
3054 warning_code = OPT_Wshadow_local;
3055 warned = warning_at (DECL_SOURCE_LOCATION (new_decl), warning_code,
3056 "declaration of %qD shadows a parameter",
3059 else if (DECL_FILE_SCOPE_P (old_decl))
3061 /* Do not warn if a variable shadows a function, unless
3062 the variable is a function or a pointer-to-function. */
3063 if (TREE_CODE (old_decl) == FUNCTION_DECL
3064 && TREE_CODE (new_decl) != FUNCTION_DECL
3065 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl)))
3068 warned = warning_at (DECL_SOURCE_LOCATION (new_decl), OPT_Wshadow,
3069 "declaration of %qD shadows a global "
3073 else if (TREE_CODE (old_decl) == FUNCTION_DECL
3074 && fndecl_built_in_p (old_decl))
3076 warning (OPT_Wshadow, "declaration of %q+D shadows "
3077 "a built-in function", new_decl);
3082 enum opt_code warning_code;
3084 /* If '-Wshadow=compatible-local' is specified without other
3085 -Wshadow= flags, we will warn only when the types of the
3086 shadowing variable (i.e. new_decl) and the shadowed variable
3087 (old_decl) are compatible. */
3089 warning_code = OPT_Wshadow;
3090 else if (comptypes (TREE_TYPE (old_decl), TREE_TYPE (new_decl)))
3091 warning_code = OPT_Wshadow_compatible_local;
3093 warning_code = OPT_Wshadow_local;
3094 warned = warning_at (DECL_SOURCE_LOCATION (new_decl), warning_code,
3095 "declaration of %qD shadows a previous local",
3100 inform (DECL_SOURCE_LOCATION (old_decl),
3101 "shadowed declaration is here");
3107 /* Record a decl-node X as belonging to the current lexical scope.
3108 Check for errors (such as an incompatible declaration for the same
3109 name already seen in the same scope).
3111 Returns either X or an old decl for the same name.
3112 If an old decl is returned, it may have been smashed
3113 to agree with what X says. */
3118 tree name = DECL_NAME (x);
3119 struct c_scope *scope = current_scope;
3120 struct c_binding *b;
3121 bool nested = false;
3122 location_t locus = DECL_SOURCE_LOCATION (x);
3124 /* Must set DECL_CONTEXT for everything not at file scope or
3125 DECL_FILE_SCOPE_P won't work. Local externs don't count
3126 unless they have initializers (which generate code). */
3127 if (current_function_decl
3128 && (!VAR_OR_FUNCTION_DECL_P (x)
3129 || DECL_INITIAL (x) || !TREE_PUBLIC (x)))
3130 DECL_CONTEXT (x) = current_function_decl;
3132 /* Anonymous decls are just inserted in the scope. */
3135 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
3140 /* First, see if there is another declaration with the same name in
3141 the current scope. If there is, duplicate_decls may do all the
3142 work for us. If duplicate_decls returns false, that indicates
3143 two incompatible decls in the same scope; we are to silently
3144 replace the old one (duplicate_decls has issued all appropriate
3145 diagnostics). In particular, we should not consider possible
3146 duplicates in the external scope, or shadowing. */
3147 b = I_SYMBOL_BINDING (name);
3148 if (b && B_IN_SCOPE (b, scope))
3150 struct c_binding *b_ext, *b_use;
3151 tree type = TREE_TYPE (x);
3152 tree visdecl = b->decl;
3153 tree vistype = TREE_TYPE (visdecl);
3154 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3155 && COMPLETE_TYPE_P (TREE_TYPE (x)))
3156 b->inner_comp = false;
3159 /* If this is an external linkage declaration, we should check
3160 for compatibility with the type in the external scope before
3161 setting the type at this scope based on the visible
3162 information only. */
3163 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
3165 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3166 b_ext = b_ext->shadowed;
3171 TREE_TYPE (b_use->decl) = b_use->u.type;
3174 if (duplicate_decls (x, b_use->decl))
3178 /* Save the updated type in the external scope and
3179 restore the proper type for this scope. */
3181 if (comptypes (vistype, type))
3182 thistype = composite_type (vistype, type);
3184 thistype = TREE_TYPE (b_use->decl);
3185 b_use->u.type = TREE_TYPE (b_use->decl);
3186 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
3187 && fndecl_built_in_p (b_use->decl))
3189 = build_type_attribute_variant (thistype,
3192 TREE_TYPE (b_use->decl) = thistype;
3197 goto skip_external_and_shadow_checks;
3200 /* All declarations with external linkage, and all external
3201 references, go in the external scope, no matter what scope is
3202 current. However, the binding in that scope is ignored for
3203 purposes of normal name lookup. A separate binding structure is
3204 created in the requested scope; this governs the normal
3205 visibility of the symbol.
3207 The binding in the externals scope is used exclusively for
3208 detecting duplicate declarations of the same object, no matter
3209 what scope they are in; this is what we do here. (C99 6.2.7p2:
3210 All declarations that refer to the same object or function shall
3211 have compatible type; otherwise, the behavior is undefined.)
3212 However, in Objective-C, we also want to detect declarations
3213 conflicting with those of the basic types. */
3214 if ((DECL_EXTERNAL (x) || scope == file_scope)
3215 && (VAR_OR_FUNCTION_DECL_P (x) || c_dialect_objc ()))
3217 tree type = TREE_TYPE (x);
3218 tree vistype = NULL_TREE;
3219 tree visdecl = NULL_TREE;
3220 bool type_saved = false;
3221 if (b && !B_IN_EXTERNAL_SCOPE (b)
3222 && VAR_OR_FUNCTION_DECL_P (b->decl)
3223 && DECL_FILE_SCOPE_P (b->decl))
3226 vistype = TREE_TYPE (visdecl);
3228 if (scope != file_scope
3229 && !DECL_IN_SYSTEM_HEADER (x))
3230 warning_at (locus, OPT_Wnested_externs,
3231 "nested extern declaration of %qD", x);
3233 while (b && !B_IN_EXTERNAL_SCOPE (b))
3235 /* If this decl might be modified, save its type. This is
3236 done here rather than when the decl is first bound
3237 because the type may change after first binding, through
3238 being completed or through attributes being added. If we
3239 encounter multiple such decls, only the first should have
3240 its type saved; the others will already have had their
3241 proper types saved and the types will not have changed as
3242 their scopes will not have been re-entered. */
3243 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
3245 b->u.type = TREE_TYPE (b->decl);
3248 if (B_IN_FILE_SCOPE (b)
3250 && TREE_STATIC (b->decl)
3251 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
3252 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
3253 && TREE_CODE (type) == ARRAY_TYPE
3254 && TYPE_DOMAIN (type)
3255 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
3256 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
3258 /* Array type completed in inner scope, which should be
3259 diagnosed if the completion does not have size 1 and
3260 it does not get completed in the file scope. */
3261 b->inner_comp = true;
3266 /* If a matching external declaration has been found, set its
3267 type to the composite of all the types of that declaration.
3268 After the consistency checks, it will be reset to the
3269 composite of the visible types only. */
3270 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
3272 TREE_TYPE (b->decl) = b->u.type;
3274 /* The point of the same_translation_unit_p check here is,
3275 we want to detect a duplicate decl for a construct like
3276 foo() { extern bar(); } ... static bar(); but not if
3277 they are in different translation units. In any case,
3278 the static does not go in the externals scope. */
3280 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
3281 && duplicate_decls (x, b->decl))
3286 if (comptypes (vistype, type))
3287 thistype = composite_type (vistype, type);
3289 thistype = TREE_TYPE (b->decl);
3293 b->u.type = TREE_TYPE (b->decl);
3294 /* Propagate the type attributes to the decl. */
3296 = build_type_attribute_variant (thistype,
3297 TYPE_ATTRIBUTES (b->u.type));
3298 TREE_TYPE (b->decl) = thistype;
3299 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
3303 else if (TREE_PUBLIC (x))
3305 if (visdecl && !b && duplicate_decls (x, visdecl))
3307 /* An external declaration at block scope referring to a
3308 visible entity with internal linkage. The composite
3309 type will already be correct for this scope, so we
3310 just need to fall through to make the declaration in
3317 bind (name, x, external_scope, /*invisible=*/true,
3318 /*nested=*/false, locus);
3324 if (TREE_CODE (x) != PARM_DECL)
3325 warn_if_shadowing (x);
3327 skip_external_and_shadow_checks:
3328 if (TREE_CODE (x) == TYPE_DECL)
3330 /* So this is a typedef, set its underlying type. */
3331 set_underlying_type (x);
3333 /* If X is a typedef defined in the current function, record it
3334 for the purpose of implementing the -Wunused-local-typedefs
3336 record_locally_defined_typedef (x);
3339 bind (name, x, scope, /*invisible=*/false, nested, locus);
3341 /* If x's type is incomplete because it's based on a
3342 structure or union which has not yet been fully declared,
3343 attach it to that structure or union type, so we can go
3344 back and complete the variable declaration later, if the
3345 structure or union gets fully declared.
3347 If the input is erroneous, we can have error_mark in the type
3348 slot (e.g. "f(void a, ...)") - that doesn't count as an
3350 if (TREE_TYPE (x) != error_mark_node
3351 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
3353 tree element = TREE_TYPE (x);
3355 while (TREE_CODE (element) == ARRAY_TYPE)
3356 element = TREE_TYPE (element);
3357 element = TYPE_MAIN_VARIANT (element);
3359 if ((RECORD_OR_UNION_TYPE_P (element)
3360 || TREE_CODE (element) == ENUMERAL_TYPE)
3361 && (TREE_CODE (x) != TYPE_DECL
3362 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
3363 && !COMPLETE_TYPE_P (element))
3364 C_TYPE_INCOMPLETE_VARS (element)
3365 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
3371 /* Issue a warning about implicit function declaration. ID is the function
3372 identifier, OLDDECL is a declaration of the function in a different scope,
3376 implicit_decl_warning (location_t loc, tree id, tree olddecl)
3378 if (!warn_implicit_function_declaration)
3382 auto_diagnostic_group d;
3385 hint = lookup_name_fuzzy (id, FUZZY_LOOKUP_FUNCTION_NAME, loc);
3389 if (const char *suggestion = hint.suggestion ())
3391 gcc_rich_location richloc (loc);
3392 richloc.add_fixit_replace (suggestion);
3393 warned = pedwarn (&richloc, OPT_Wimplicit_function_declaration,
3394 "implicit declaration of function %qE;"
3395 " did you mean %qs?",
3399 warned = pedwarn (loc, OPT_Wimplicit_function_declaration,
3400 "implicit declaration of function %qE", id);
3402 else if (const char *suggestion = hint.suggestion ())
3404 gcc_rich_location richloc (loc);
3405 richloc.add_fixit_replace (suggestion);
3407 (&richloc, OPT_Wimplicit_function_declaration,
3408 G_("implicit declaration of function %qE; did you mean %qs?"),
3412 warned = warning_at (loc, OPT_Wimplicit_function_declaration,
3413 G_("implicit declaration of function %qE"), id);
3417 /* Whether the olddecl is an undeclared builtin function.
3418 locate_old_decl will not generate a diagnostic for those,
3419 so in that case we want to look elsewhere. */
3420 bool undeclared_builtin = (olddecl
3421 && TREE_CODE (olddecl) == FUNCTION_DECL
3422 && fndecl_built_in_p (olddecl)
3423 && !C_DECL_DECLARED_BUILTIN (olddecl));
3424 if (undeclared_builtin)
3426 const char *header = header_for_builtin_fn (olddecl);
3429 rich_location richloc (line_table, loc);
3430 maybe_add_include_fixit (&richloc, header, true);
3432 "include %qs or provide a declaration of %qE",
3437 locate_old_decl (olddecl);
3444 /* Return the name of the header file that declares built-in function
3445 FNDECL, or null if either we don't know or don't expect to see an
3446 explicit declaration. */
3449 header_for_builtin_fn (tree fndecl)
3451 if (DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_NORMAL)
3454 switch (DECL_FUNCTION_CODE (fndecl))
3456 CASE_FLT_FN (BUILT_IN_ACOS):
3457 CASE_FLT_FN (BUILT_IN_ACOSH):
3458 CASE_FLT_FN (BUILT_IN_ASIN):
3459 CASE_FLT_FN (BUILT_IN_ASINH):
3460 CASE_FLT_FN (BUILT_IN_ATAN):
3461 CASE_FLT_FN (BUILT_IN_ATANH):
3462 CASE_FLT_FN (BUILT_IN_ATAN2):
3463 CASE_FLT_FN (BUILT_IN_CBRT):
3464 CASE_FLT_FN (BUILT_IN_CEIL):
3465 CASE_FLT_FN_FLOATN_NX (BUILT_IN_CEIL):
3466 CASE_FLT_FN (BUILT_IN_COPYSIGN):
3467 CASE_FLT_FN_FLOATN_NX (BUILT_IN_COPYSIGN):
3468 CASE_FLT_FN (BUILT_IN_COS):
3469 CASE_FLT_FN (BUILT_IN_COSH):
3470 CASE_FLT_FN (BUILT_IN_ERF):
3471 CASE_FLT_FN (BUILT_IN_ERFC):
3472 CASE_FLT_FN (BUILT_IN_EXP):
3473 CASE_FLT_FN (BUILT_IN_EXP2):
3474 CASE_FLT_FN (BUILT_IN_EXPM1):
3475 CASE_FLT_FN (BUILT_IN_FABS):
3476 CASE_FLT_FN_FLOATN_NX (BUILT_IN_FABS):
3477 CASE_FLT_FN (BUILT_IN_FDIM):
3478 CASE_FLT_FN (BUILT_IN_FLOOR):
3479 CASE_FLT_FN_FLOATN_NX (BUILT_IN_FLOOR):
3480 CASE_FLT_FN (BUILT_IN_FMA):
3481 CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMA):
3482 CASE_FLT_FN (BUILT_IN_FMAX):
3483 CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMAX):
3484 CASE_FLT_FN (BUILT_IN_FMIN):
3485 CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMIN):
3486 CASE_FLT_FN (BUILT_IN_FMOD):
3487 CASE_FLT_FN (BUILT_IN_FREXP):
3488 CASE_FLT_FN (BUILT_IN_HYPOT):
3489 CASE_FLT_FN (BUILT_IN_ILOGB):
3490 CASE_FLT_FN (BUILT_IN_LDEXP):
3491 CASE_FLT_FN (BUILT_IN_LGAMMA):
3492 CASE_FLT_FN (BUILT_IN_LLRINT):
3493 CASE_FLT_FN (BUILT_IN_LLROUND):
3494 CASE_FLT_FN (BUILT_IN_LOG):
3495 CASE_FLT_FN (BUILT_IN_LOG10):
3496 CASE_FLT_FN (BUILT_IN_LOG1P):
3497 CASE_FLT_FN (BUILT_IN_LOG2):
3498 CASE_FLT_FN (BUILT_IN_LOGB):
3499 CASE_FLT_FN (BUILT_IN_LRINT):
3500 CASE_FLT_FN (BUILT_IN_LROUND):
3501 CASE_FLT_FN (BUILT_IN_MODF):
3502 CASE_FLT_FN (BUILT_IN_NAN):
3503 CASE_FLT_FN (BUILT_IN_NEARBYINT):
3504 CASE_FLT_FN_FLOATN_NX (BUILT_IN_NEARBYINT):
3505 CASE_FLT_FN (BUILT_IN_NEXTAFTER):
3506 CASE_FLT_FN (BUILT_IN_NEXTTOWARD):
3507 CASE_FLT_FN (BUILT_IN_POW):
3508 CASE_FLT_FN (BUILT_IN_REMAINDER):
3509 CASE_FLT_FN (BUILT_IN_REMQUO):
3510 CASE_FLT_FN (BUILT_IN_RINT):
3511 CASE_FLT_FN_FLOATN_NX (BUILT_IN_RINT):
3512 CASE_FLT_FN (BUILT_IN_ROUND):
3513 CASE_FLT_FN_FLOATN_NX (BUILT_IN_ROUND):
3514 CASE_FLT_FN (BUILT_IN_SCALBLN):
3515 CASE_FLT_FN (BUILT_IN_SCALBN):
3516 CASE_FLT_FN (BUILT_IN_SIN):
3517 CASE_FLT_FN (BUILT_IN_SINH):
3518 CASE_FLT_FN (BUILT_IN_SINCOS):
3519 CASE_FLT_FN (BUILT_IN_SQRT):
3520 CASE_FLT_FN_FLOATN_NX (BUILT_IN_SQRT):
3521 CASE_FLT_FN (BUILT_IN_TAN):
3522 CASE_FLT_FN (BUILT_IN_TANH):
3523 CASE_FLT_FN (BUILT_IN_TGAMMA):
3524 CASE_FLT_FN (BUILT_IN_TRUNC):
3525 CASE_FLT_FN_FLOATN_NX (BUILT_IN_TRUNC):
3526 case BUILT_IN_ISINF:
3527 case BUILT_IN_ISNAN:
3529 CASE_FLT_FN (BUILT_IN_CABS):
3530 CASE_FLT_FN (BUILT_IN_CACOS):
3531 CASE_FLT_FN (BUILT_IN_CACOSH):
3532 CASE_FLT_FN (BUILT_IN_CARG):
3533 CASE_FLT_FN (BUILT_IN_CASIN):
3534 CASE_FLT_FN (BUILT_IN_CASINH):
3535 CASE_FLT_FN (BUILT_IN_CATAN):
3536 CASE_FLT_FN (BUILT_IN_CATANH):
3537 CASE_FLT_FN (BUILT_IN_CCOS):
3538 CASE_FLT_FN (BUILT_IN_CCOSH):
3539 CASE_FLT_FN (BUILT_IN_CEXP):
3540 CASE_FLT_FN (BUILT_IN_CIMAG):
3541 CASE_FLT_FN (BUILT_IN_CLOG):
3542 CASE_FLT_FN (BUILT_IN_CONJ):
3543 CASE_FLT_FN (BUILT_IN_CPOW):
3544 CASE_FLT_FN (BUILT_IN_CPROJ):
3545 CASE_FLT_FN (BUILT_IN_CREAL):
3546 CASE_FLT_FN (BUILT_IN_CSIN):
3547 CASE_FLT_FN (BUILT_IN_CSINH):
3548 CASE_FLT_FN (BUILT_IN_CSQRT):
3549 CASE_FLT_FN (BUILT_IN_CTAN):
3550 CASE_FLT_FN (BUILT_IN_CTANH):
3551 return "<complex.h>";
3552 case BUILT_IN_MEMCHR:
3553 case BUILT_IN_MEMCMP:
3554 case BUILT_IN_MEMCPY:
3555 case BUILT_IN_MEMMOVE:
3556 case BUILT_IN_MEMSET:
3557 case BUILT_IN_STRCAT:
3558 case BUILT_IN_STRCHR:
3559 case BUILT_IN_STRCMP:
3560 case BUILT_IN_STRCPY:
3561 case BUILT_IN_STRCSPN:
3562 case BUILT_IN_STRLEN:
3563 case BUILT_IN_STRNCAT:
3564 case BUILT_IN_STRNCMP:
3565 case BUILT_IN_STRNCPY:
3566 case BUILT_IN_STRPBRK:
3567 case BUILT_IN_STRRCHR:
3568 case BUILT_IN_STRSPN:
3569 case BUILT_IN_STRSTR:
3570 return "<string.h>";
3571 case BUILT_IN_FPRINTF:
3573 case BUILT_IN_FPUTC:
3574 case BUILT_IN_FPUTS:
3575 case BUILT_IN_FSCANF:
3576 case BUILT_IN_FWRITE:
3577 case BUILT_IN_PRINTF:
3578 case BUILT_IN_PUTCHAR:
3580 case BUILT_IN_SCANF:
3581 case BUILT_IN_SNPRINTF:
3582 case BUILT_IN_SPRINTF:
3583 case BUILT_IN_SSCANF:
3584 case BUILT_IN_VFPRINTF:
3585 case BUILT_IN_VFSCANF:
3586 case BUILT_IN_VPRINTF:
3587 case BUILT_IN_VSCANF:
3588 case BUILT_IN_VSNPRINTF:
3589 case BUILT_IN_VSPRINTF:
3590 case BUILT_IN_VSSCANF:
3592 case BUILT_IN_ISALNUM:
3593 case BUILT_IN_ISALPHA:
3594 case BUILT_IN_ISBLANK:
3595 case BUILT_IN_ISCNTRL:
3596 case BUILT_IN_ISDIGIT:
3597 case BUILT_IN_ISGRAPH:
3598 case BUILT_IN_ISLOWER:
3599 case BUILT_IN_ISPRINT:
3600 case BUILT_IN_ISPUNCT:
3601 case BUILT_IN_ISSPACE:
3602 case BUILT_IN_ISUPPER:
3603 case BUILT_IN_ISXDIGIT:
3604 case BUILT_IN_TOLOWER:
3605 case BUILT_IN_TOUPPER:
3607 case BUILT_IN_ISWALNUM:
3608 case BUILT_IN_ISWALPHA:
3609 case BUILT_IN_ISWBLANK:
3610 case BUILT_IN_ISWCNTRL:
3611 case BUILT_IN_ISWDIGIT:
3612 case BUILT_IN_ISWGRAPH:
3613 case BUILT_IN_ISWLOWER:
3614 case BUILT_IN_ISWPRINT:
3615 case BUILT_IN_ISWPUNCT:
3616 case BUILT_IN_ISWSPACE:
3617 case BUILT_IN_ISWUPPER:
3618 case BUILT_IN_ISWXDIGIT:
3619 case BUILT_IN_TOWLOWER:
3620 case BUILT_IN_TOWUPPER:
3621 return "<wctype.h>";
3622 case BUILT_IN_ABORT:
3624 case BUILT_IN_CALLOC:
3628 case BUILT_IN_LLABS:
3629 case BUILT_IN_MALLOC:
3630 case BUILT_IN_REALLOC:
3631 case BUILT_IN__EXIT2:
3632 case BUILT_IN_ALIGNED_ALLOC:
3633 return "<stdlib.h>";
3634 case BUILT_IN_IMAXABS:
3635 return "<inttypes.h>";
3636 case BUILT_IN_STRFTIME:
3643 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
3644 function of type int (). */
3647 implicitly_declare (location_t loc, tree functionid)
3649 struct c_binding *b;
3650 tree decl = NULL_TREE;
3653 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
3655 if (B_IN_SCOPE (b, external_scope))
3664 if (TREE_CODE (decl) != FUNCTION_DECL)
3667 /* FIXME: Objective-C has weird not-really-builtin functions
3668 which are supposed to be visible automatically. They wind up
3669 in the external scope because they're pushed before the file
3670 scope gets created. Catch this here and rebind them into the
3672 if (!fndecl_built_in_p (decl) && DECL_IS_UNDECLARED_BUILTIN (decl))
3674 bind (functionid, decl, file_scope,
3675 /*invisible=*/false, /*nested=*/true,
3676 DECL_SOURCE_LOCATION (decl));
3681 tree newtype = default_function_type;
3683 TREE_TYPE (decl) = b->u.type;
3684 /* Implicit declaration of a function already declared
3685 (somehow) in a different scope, or as a built-in.
3686 If this is the first time this has happened, warn;
3687 then recycle the old declaration but with the new type. */
3688 if (!C_DECL_IMPLICIT (decl))
3690 implicit_decl_warning (loc, functionid, decl);
3691 C_DECL_IMPLICIT (decl) = 1;
3693 if (fndecl_built_in_p (decl))
3695 newtype = build_type_attribute_variant (newtype,
3697 (TREE_TYPE (decl)));
3698 if (!comptypes (newtype, TREE_TYPE (decl)))
3700 auto_diagnostic_group d;
3701 bool warned = warning_at (loc,
3702 OPT_Wbuiltin_declaration_mismatch,
3703 "incompatible implicit "
3704 "declaration of built-in "
3705 "function %qD", decl);
3706 /* See if we can hint which header to include. */
3707 const char *header = header_for_builtin_fn (decl);
3708 if (header != NULL && warned)
3710 rich_location richloc (line_table, loc);
3711 maybe_add_include_fixit (&richloc, header, true);
3713 "include %qs or provide a declaration of %qD",
3716 newtype = TREE_TYPE (decl);
3721 if (!comptypes (newtype, TREE_TYPE (decl)))
3723 auto_diagnostic_group d;
3724 error_at (loc, "incompatible implicit declaration of "
3725 "function %qD", decl);
3726 locate_old_decl (decl);
3729 b->u.type = TREE_TYPE (decl);
3730 TREE_TYPE (decl) = newtype;
3731 bind (functionid, decl, current_scope,
3732 /*invisible=*/false, /*nested=*/true,
3733 DECL_SOURCE_LOCATION (decl));
3738 /* Not seen before. */
3739 decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type);
3740 DECL_EXTERNAL (decl) = 1;
3741 TREE_PUBLIC (decl) = 1;
3742 C_DECL_IMPLICIT (decl) = 1;
3743 implicit_decl_warning (loc, functionid, 0);
3744 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
3746 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
3748 /* C89 says implicit declarations are in the innermost block.
3749 So we record the decl in the standard fashion. */
3750 decl = pushdecl (decl);
3752 /* No need to call objc_check_decl here - it's a function type. */
3753 rest_of_decl_compilation (decl, 0, 0);
3755 /* Write a record describing this implicit function declaration
3756 to the prototypes file (if requested). */
3757 gen_aux_info_record (decl, 0, 1, 0);
3759 /* Possibly apply some default attributes to this implicit declaration. */
3760 decl_attributes (&decl, NULL_TREE, 0);
3765 /* Issue an error message for a reference to an undeclared variable
3766 ID, including a reference to a builtin outside of function-call
3767 context. Establish a binding of the identifier to error_mark_node
3768 in an appropriate scope, which will suppress further errors for the
3769 same identifier. The error message should be given location LOC. */
3771 undeclared_variable (location_t loc, tree id)
3773 static bool already = false;
3774 struct c_scope *scope;
3776 auto_diagnostic_group d;
3777 if (current_function_decl == NULL_TREE)
3779 name_hint guessed_id = lookup_name_fuzzy (id, FUZZY_LOOKUP_NAME, loc);
3780 if (const char *suggestion = guessed_id.suggestion ())
3782 gcc_rich_location richloc (loc);
3783 richloc.add_fixit_replace (suggestion);
3785 "%qE undeclared here (not in a function);"
3786 " did you mean %qs?",
3790 error_at (loc, "%qE undeclared here (not in a function)", id);
3791 scope = current_scope;
3795 if (!objc_diagnose_private_ivar (id))
3797 name_hint guessed_id = lookup_name_fuzzy (id, FUZZY_LOOKUP_NAME, loc);
3798 if (const char *suggestion = guessed_id.suggestion ())
3800 gcc_rich_location richloc (loc);
3801 richloc.add_fixit_replace (suggestion);
3803 "%qE undeclared (first use in this function);"
3804 " did you mean %qs?",
3808 error_at (loc, "%qE undeclared (first use in this function)", id);
3812 inform (loc, "each undeclared identifier is reported only"
3813 " once for each function it appears in");
3817 /* If we are parsing old-style parameter decls, current_function_decl
3818 will be nonnull but current_function_scope will be null. */
3819 scope = current_function_scope ? current_function_scope : current_scope;
3821 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
3825 /* Subroutine of lookup_label, declare_label, define_label: construct a
3826 LABEL_DECL with all the proper frills. Also create a struct
3827 c_label_vars initialized for the current scope. */
3830 make_label (location_t location, tree name, bool defining,
3831 struct c_label_vars **p_label_vars)
3833 tree label = build_decl (location, LABEL_DECL, name, void_type_node);
3834 DECL_CONTEXT (label) = current_function_decl;
3835 SET_DECL_MODE (label, VOIDmode);
3837 c_label_vars *label_vars = ggc_alloc<c_label_vars> ();
3838 label_vars->shadowed = NULL;
3839 set_spot_bindings (&label_vars->label_bindings, defining);
3840 label_vars->decls_in_scope = make_tree_vector ();
3841 label_vars->gotos = NULL;
3842 *p_label_vars = label_vars;
3847 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3848 Create one if none exists so far for the current function.
3849 This is called when a label is used in a goto expression or
3850 has its address taken. */
3853 lookup_label (tree name)
3856 struct c_label_vars *label_vars;
3858 if (current_function_scope == 0)
3860 error ("label %qE referenced outside of any function", name);
3864 /* Use a label already defined or ref'd with this name, but not if
3865 it is inherited from a containing function and wasn't declared
3867 label = I_LABEL_DECL (name);
3868 if (label && (DECL_CONTEXT (label) == current_function_decl
3869 || C_DECLARED_LABEL_FLAG (label)))
3871 /* If the label has only been declared, update its apparent
3872 location to point here, for better diagnostics if it
3873 turns out not to have been defined. */
3874 if (DECL_INITIAL (label) == NULL_TREE)
3875 DECL_SOURCE_LOCATION (label) = input_location;
3879 /* No label binding for that identifier; make one. */
3880 label = make_label (input_location, name, false, &label_vars);
3882 /* Ordinary labels go in the current function scope. */
3883 bind_label (name, label, current_function_scope, label_vars);
3888 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3892 warn_about_goto (location_t goto_loc, tree label, tree decl)
3894 auto_diagnostic_group d;
3895 if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3897 "jump into scope of identifier with variably modified type");
3899 if (!warning_at (goto_loc, OPT_Wjump_misses_init,
3900 "jump skips variable initialization"))
3902 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3903 inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl);
3906 /* Look up a label because of a goto statement. This is like
3907 lookup_label, but also issues any appropriate warnings. */
3910 lookup_label_for_goto (location_t loc, tree name)
3913 struct c_label_vars *label_vars;
3917 label = lookup_label (name);
3918 if (label == NULL_TREE)
3921 /* If we are jumping to a different function, we can't issue any
3923 if (DECL_CONTEXT (label) != current_function_decl)
3925 gcc_assert (C_DECLARED_LABEL_FLAG (label));
3929 label_vars = I_LABEL_BINDING (name)->u.label;
3931 /* If the label has not yet been defined, then push this goto on a
3932 list for possible later warnings. */
3933 if (label_vars->label_bindings.scope == NULL)
3935 c_goto_bindings *g = ggc_alloc<c_goto_bindings> ();
3938 set_spot_bindings (&g->goto_bindings, true);
3939 vec_safe_push (label_vars->gotos, g);
3943 /* If there are any decls in label_vars->decls_in_scope, then this
3944 goto has missed the declaration of the decl. This happens for a
3950 Issue a warning or error. */
3951 FOR_EACH_VEC_SAFE_ELT (label_vars->decls_in_scope, ix, decl)
3952 warn_about_goto (loc, label, decl);
3954 if (label_vars->label_bindings.left_stmt_expr)
3956 auto_diagnostic_group d;
3957 error_at (loc, "jump into statement expression");
3958 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3964 /* Make a label named NAME in the current function, shadowing silently
3965 any that may be inherited from containing functions or containing
3966 scopes. This is called for __label__ declarations. */
3969 declare_label (tree name)
3971 struct c_binding *b = I_LABEL_BINDING (name);
3973 struct c_label_vars *label_vars;
3975 /* Check to make sure that the label hasn't already been declared
3977 if (b && B_IN_CURRENT_SCOPE (b))
3979 auto_diagnostic_group d;
3980 error ("duplicate label declaration %qE", name);
3981 locate_old_decl (b->decl);
3983 /* Just use the previous declaration. */
3987 label = make_label (input_location, name, false, &label_vars);
3988 C_DECLARED_LABEL_FLAG (label) = 1;
3990 /* Declared labels go in the current scope. */
3991 bind_label (name, label, current_scope, label_vars);
3996 /* When we define a label, issue any appropriate warnings if there are
3997 any gotos earlier in the function which jump to this label. */
4000 check_earlier_gotos (tree label, struct c_label_vars* label_vars)
4003 struct c_goto_bindings *g;
4005 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
4007 struct c_binding *b;
4008 struct c_scope *scope;
4010 /* We have a goto to this label. The goto is going forward. In
4011 g->scope, the goto is going to skip any binding which was
4012 defined after g->bindings_in_scope. */
4013 if (g->goto_bindings.scope->has_jump_unsafe_decl)
4015 for (b = g->goto_bindings.scope->bindings;
4016 b != g->goto_bindings.bindings_in_scope;
4019 if (decl_jump_unsafe (b->decl))
4020 warn_about_goto (g->loc, label, b->decl);
4024 /* We also need to warn about decls defined in any scopes
4025 between the scope of the label and the scope of the goto. */
4026 for (scope = label_vars->label_bindings.scope;
4027 scope != g->goto_bindings.scope;
4028 scope = scope->outer)
4030 gcc_assert (scope != NULL);
4031 if (scope->has_jump_unsafe_decl)
4033 if (scope == label_vars->label_bindings.scope)
4034 b = label_vars->label_bindings.bindings_in_scope;
4036 b = scope->bindings;
4037 for (; b != NULL; b = b->prev)
4039 if (decl_jump_unsafe (b->decl))
4040 warn_about_goto (g->loc, label, b->decl);
4045 if (g->goto_bindings.stmt_exprs > 0)
4047 auto_diagnostic_group d;
4048 error_at (g->loc, "jump into statement expression");
4049 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here",
4054 /* Now that the label is defined, we will issue warnings about
4055 subsequent gotos to this label when we see them. */
4056 vec_safe_truncate (label_vars->gotos, 0);
4057 label_vars->gotos = NULL;
4060 /* Define a label, specifying the location in the source file.
4061 Return the LABEL_DECL node for the label, if the definition is valid.
4062 Otherwise return NULL_TREE. */
4065 define_label (location_t location, tree name)
4067 /* Find any preexisting label with this name. It is an error
4068 if that label has already been defined in this function, or
4069 if there is a containing function with a declared label with
4071 tree label = I_LABEL_DECL (name);
4074 && ((DECL_CONTEXT (label) == current_function_decl
4075 && DECL_INITIAL (label) != NULL_TREE)
4076 || (DECL_CONTEXT (label) != current_function_decl
4077 && C_DECLARED_LABEL_FLAG (label))))
4079 auto_diagnostic_group d;
4080 error_at (location, "duplicate label %qD", label);
4081 locate_old_decl (label);
4084 else if (label && DECL_CONTEXT (label) == current_function_decl)
4086 struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label;
4088 /* The label has been used or declared already in this function,
4089 but not defined. Update its location to point to this
4091 DECL_SOURCE_LOCATION (label) = location;
4092 set_spot_bindings (&label_vars->label_bindings, true);
4094 /* Issue warnings as required about any goto statements from
4095 earlier in the function. */
4096 check_earlier_gotos (label, label_vars);
4100 struct c_label_vars *label_vars;
4102 /* No label binding for that identifier; make one. */
4103 label = make_label (location, name, true, &label_vars);
4105 /* Ordinary labels go in the current function scope. */
4106 bind_label (name, label, current_function_scope, label_vars);
4109 if (!in_system_header_at (input_location) && lookup_name (name))
4110 warning_at (location, OPT_Wtraditional,
4111 "traditional C lacks a separate namespace "
4112 "for labels, identifier %qE conflicts", name);
4114 /* Mark label as having been defined. */
4115 DECL_INITIAL (label) = error_mark_node;
4119 /* Get the bindings for a new switch statement. This is used to issue
4120 warnings as appropriate for jumps from the switch to case or
4123 struct c_spot_bindings *
4124 c_get_switch_bindings (void)
4126 struct c_spot_bindings *switch_bindings;
4128 switch_bindings = XNEW (struct c_spot_bindings);
4129 set_spot_bindings (switch_bindings, true);
4130 return switch_bindings;
4134 c_release_switch_bindings (struct c_spot_bindings *bindings)
4136 gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr);
4140 /* This is called at the point of a case or default label to issue
4141 warnings about decls as needed. It returns true if it found an
4142 error, not just a warning. */
4145 c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings,
4146 location_t switch_loc, location_t case_loc)
4149 struct c_scope *scope;
4152 for (scope = current_scope;
4153 scope != switch_bindings->scope;
4154 scope = scope->outer)
4156 struct c_binding *b;
4158 gcc_assert (scope != NULL);
4160 if (!scope->has_jump_unsafe_decl)
4163 for (b = scope->bindings; b != NULL; b = b->prev)
4165 if (decl_jump_unsafe (b->decl))
4167 auto_diagnostic_group d;
4169 if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE))
4173 ("switch jumps into scope of identifier with "
4174 "variably modified type"));
4179 = warning_at (case_loc, OPT_Wjump_misses_init,
4180 "switch jumps over variable initialization");
4183 inform (switch_loc, "switch starts here");
4184 inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here",
4191 if (switch_bindings->stmt_exprs > 0)
4194 auto_diagnostic_group d;
4195 error_at (case_loc, "switch jumps into statement expression");
4196 inform (switch_loc, "switch starts here");
4202 /* Given NAME, an IDENTIFIER_NODE,
4203 return the structure (or union or enum) definition for that name.
4204 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
4205 CODE says which kind of type the caller wants;
4206 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
4207 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
4208 location where the tag was defined.
4209 If the wrong kind of type is found, an error is reported. */
4212 lookup_tag (enum tree_code code, tree name, bool thislevel_only,
4215 struct c_binding *b = I_TAG_BINDING (name);
4216 bool thislevel = false;
4221 /* We only care about whether it's in this level if
4222 thislevel_only was set or it might be a type clash. */
4223 if (thislevel_only || TREE_CODE (b->decl) != code)
4225 /* For our purposes, a tag in the external scope is the same as
4226 a tag in the file scope. (Primarily relevant to Objective-C
4227 and its builtin structure tags, which get pushed before the
4228 file scope is created.) */
4229 if (B_IN_CURRENT_SCOPE (b)
4230 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
4234 if (thislevel_only && !thislevel)
4237 if (TREE_CODE (b->decl) != code)
4239 /* Definition isn't the kind we were looking for. */
4240 pending_invalid_xref = name;
4241 pending_invalid_xref_location = input_location;
4243 /* If in the same binding level as a declaration as a tag
4244 of a different type, this must not be allowed to
4245 shadow that tag, so give the error immediately.
4246 (For example, "struct foo; union foo;" is invalid.) */
4248 pending_xref_error ();
4257 /* Return true if a definition exists for NAME with code CODE. */
4260 tag_exists_p (enum tree_code code, tree name)
4262 struct c_binding *b = I_TAG_BINDING (name);
4264 if (b == NULL || b->decl == NULL_TREE)
4266 return TREE_CODE (b->decl) == code;
4269 /* Print an error message now
4270 for a recent invalid struct, union or enum cross reference.
4271 We don't print them immediately because they are not invalid
4272 when used in the `struct foo;' construct for shadowing. */
4275 pending_xref_error (void)
4277 if (pending_invalid_xref != NULL_TREE)
4278 error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag",
4279 pending_invalid_xref);
4280 pending_invalid_xref = NULL_TREE;
4284 /* Look up NAME in the current scope and its superiors
4285 in the namespace of variables, functions and typedefs.
4286 Return a ..._DECL node of some kind representing its definition,
4287 or return NULL_TREE if it is undefined. */
4290 lookup_name (tree name)
4292 struct c_binding *b = I_SYMBOL_BINDING (name);
4293 if (b && !b->invisible)
4295 maybe_record_typedef_use (b->decl);
4301 /* Similar to `lookup_name' but look only at the indicated scope. */
4304 lookup_name_in_scope (tree name, struct c_scope *scope)
4306 struct c_binding *b;
4308 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
4309 if (B_IN_SCOPE (b, scope))
4314 /* Look for the closest match for NAME within the currently valid
4317 This finds the identifier with the lowest Levenshtein distance to
4318 NAME. If there are multiple candidates with equal minimal distance,
4319 the first one found is returned. Scopes are searched from innermost
4320 outwards, and within a scope in reverse order of declaration, thus
4321 benefiting candidates "near" to the current scope.
4323 The function also looks for similar macro names to NAME, since a
4324 misspelled macro name will not be expanded, and hence looks like an
4325 identifier to the C frontend.
4327 It also looks for start_typename keywords, to detect "singed" vs "signed"
4330 Use LOC for any deferred diagnostics. */
4333 lookup_name_fuzzy (tree name, enum lookup_name_fuzzy_kind kind, location_t loc)
4335 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
4337 /* First, try some well-known names in the C standard library, in case
4338 the user forgot a #include. */
4339 const char *header_hint
4340 = get_c_stdlib_header_for_name (IDENTIFIER_POINTER (name));
4343 return name_hint (NULL,
4344 new suggest_missing_header (loc,
4345 IDENTIFIER_POINTER (name),
4348 /* Only suggest names reserved for the implementation if NAME begins
4349 with an underscore. */
4350 bool consider_implementation_names = (IDENTIFIER_POINTER (name)[0] == '_');
4352 best_match<tree, tree> bm (name);
4354 /* Look within currently valid scopes. */
4355 for (c_scope *scope = current_scope; scope; scope = scope->outer)
4356 for (c_binding *binding = scope->bindings; binding; binding = binding->prev)
4358 if (!binding->id || binding->invisible)
4360 if (binding->decl == error_mark_node)
4362 /* Don't use bindings from implicitly declared functions,
4363 as they were likely misspellings themselves. */
4364 if (TREE_CODE (binding->decl) == FUNCTION_DECL)
4365 if (C_DECL_IMPLICIT (binding->decl))
4367 /* Don't suggest names that are reserved for use by the
4368 implementation, unless NAME began with an underscore. */
4369 if (!consider_implementation_names)
4371 const char *suggestion_str = IDENTIFIER_POINTER (binding->id);
4372 if (name_reserved_for_implementation_p (suggestion_str))
4377 case FUZZY_LOOKUP_TYPENAME:
4378 if (TREE_CODE (binding->decl) != TYPE_DECL)
4382 case FUZZY_LOOKUP_FUNCTION_NAME:
4383 if (TREE_CODE (binding->decl) != FUNCTION_DECL)
4385 /* Allow function pointers. */
4386 if ((VAR_P (binding->decl)
4387 || TREE_CODE (binding->decl) == PARM_DECL)
4388 && TREE_CODE (TREE_TYPE (binding->decl)) == POINTER_TYPE
4389 && (TREE_CODE (TREE_TYPE (TREE_TYPE (binding->decl)))
4399 bm.consider (binding->id);
4402 /* Consider macros: if the user misspelled a macro name e.g. "SOME_MACRO"
4404 x = SOME_OTHER_MACRO (y);
4405 then "SOME_OTHER_MACRO" will survive to the frontend and show up
4406 as a misspelled identifier.
4408 Use the best distance so far so that a candidate is only set if
4409 a macro is better than anything so far. This allows early rejection
4410 (without calculating the edit distance) of macro names that must have
4411 distance >= bm.get_best_distance (), and means that we only get a
4412 non-NULL result for best_macro_match if it's better than any of
4413 the identifiers already checked, which avoids needless creation
4414 of identifiers for macro hashnodes. */
4415 best_macro_match bmm (name, bm.get_best_distance (), parse_in);
4416 cpp_hashnode *best_macro = bmm.get_best_meaningful_candidate ();
4417 /* If a macro is the closest so far to NAME, use it, creating an
4418 identifier tree node for it. */
4421 const char *id = (const char *)best_macro->ident.str;
4422 tree macro_as_identifier
4423 = get_identifier_with_length (id, best_macro->ident.len);
4424 bm.set_best_so_far (macro_as_identifier,
4425 bmm.get_best_distance (),
4426 bmm.get_best_candidate_length ());
4429 /* Try the "start_typename" keywords to detect
4430 "singed" vs "signed" typos. */
4431 if (kind == FUZZY_LOOKUP_TYPENAME)
4433 for (unsigned i = 0; i < num_c_common_reswords; i++)
4435 const c_common_resword *resword = &c_common_reswords[i];
4436 if (!c_keyword_starts_typename (resword->rid))
4438 tree resword_identifier = ridpointers [resword->rid];
4439 if (!resword_identifier)
4441 gcc_assert (TREE_CODE (resword_identifier) == IDENTIFIER_NODE);
4442 bm.consider (resword_identifier);
4446 tree best = bm.get_best_meaningful_candidate ();
4448 return name_hint (IDENTIFIER_POINTER (best), NULL);
4450 return name_hint (NULL, NULL);
4454 /* Handle the standard [[nodiscard]] attribute. */
4457 handle_nodiscard_attribute (tree *node, tree name, tree /*args*/,
4458 int /*flags*/, bool *no_add_attrs)
4460 if (TREE_CODE (*node) == FUNCTION_DECL)
4462 if (VOID_TYPE_P (TREE_TYPE (TREE_TYPE (*node))))
4463 warning_at (DECL_SOURCE_LOCATION (*node),
4464 OPT_Wattributes, "%qE attribute applied to %qD with void "
4465 "return type", name, *node);
4467 else if (RECORD_OR_UNION_TYPE_P (*node)
4468 || TREE_CODE (*node) == ENUMERAL_TYPE)
4472 pedwarn (input_location,
4473 OPT_Wattributes, "%qE attribute can only be applied to "
4474 "functions or to structure, union or enumeration types", name);
4475 *no_add_attrs = true;
4479 /* Table of supported standard (C2x) attributes. */
4480 const struct attribute_spec std_attribute_table[] =
4482 /* { name, min_len, max_len, decl_req, type_req, fn_type_req,
4483 affects_type_identity, handler, exclude } */
4484 { "deprecated", 0, 1, false, false, false, false,
4485 handle_deprecated_attribute, NULL },
4486 { "fallthrough", 0, 0, false, false, false, false,
4487 handle_fallthrough_attribute, NULL },
4488 { "maybe_unused", 0, 0, false, false, false, false,
4489 handle_unused_attribute, NULL },
4490 { "nodiscard", 0, 1, false, false, false, false,
4491 handle_nodiscard_attribute, NULL },
4492 { NULL, 0, 0, false, false, false, false, NULL, NULL }
4495 /* Create the predefined scalar types of C,
4496 and some nodes representing standard constants (0, 1, (void *) 0).
4497 Initialize the global scope.
4498 Make definitions for built-in primitive functions. */
4501 c_init_decl_processing (void)
4503 location_t save_loc = input_location;
4505 /* Initialize reserved words for parser. */
4508 register_scoped_attributes (std_attribute_table, NULL);
4510 current_function_decl = NULL_TREE;
4512 gcc_obstack_init (&parser_obstack);
4514 /* Make the externals scope. */
4516 external_scope = current_scope;
4518 /* Declarations from c_common_nodes_and_builtins must not be associated
4519 with this input file, lest we get differences between using and not
4520 using preprocessed headers. */
4521 input_location = BUILTINS_LOCATION;
4523 c_common_nodes_and_builtins ();
4525 /* In C, comparisons and TRUTH_* expressions have type int. */
4526 truthvalue_type_node = integer_type_node;
4527 truthvalue_true_node = integer_one_node;
4528 truthvalue_false_node = integer_zero_node;
4530 /* Even in C99, which has a real boolean type. */
4531 pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"),
4532 boolean_type_node));
4534 input_location = save_loc;
4536 make_fname_decl = c_make_fname_decl;
4537 start_fname_decls ();
4540 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
4541 give the decl, NAME is the initialization string and TYPE_DEP
4542 indicates whether NAME depended on the type of the function. As we
4543 don't yet implement delayed emission of static data, we mark the
4544 decl as emitted so it is not placed in the output. Anything using
4545 it must therefore pull out the STRING_CST initializer directly.
4549 c_make_fname_decl (location_t loc, tree id, int type_dep)
4551 const char *name = fname_as_string (type_dep);
4552 tree decl, type, init;
4553 size_t length = strlen (name);
4555 type = build_array_type (char_type_node,
4556 build_index_type (size_int (length)));
4557 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
4559 decl = build_decl (loc, VAR_DECL, id, type);
4561 TREE_STATIC (decl) = 1;
4562 TREE_READONLY (decl) = 1;
4563 DECL_ARTIFICIAL (decl) = 1;
4565 init = build_string (length + 1, name);
4566 free (CONST_CAST (char *, name));
4567 TREE_TYPE (init) = type;
4568 DECL_INITIAL (decl) = init;
4570 TREE_USED (decl) = 1;
4572 if (current_function_decl
4573 /* For invalid programs like this:
4576 const char* p = __FUNCTION__;
4578 the __FUNCTION__ is believed to appear in K&R style function
4579 parameter declarator. In that case we still don't have
4581 && current_function_scope)
4583 DECL_CONTEXT (decl) = current_function_decl;
4584 bind (id, decl, current_function_scope,
4585 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
4588 finish_decl (decl, loc, init, NULL_TREE, NULL_TREE);
4594 c_builtin_function (tree decl)
4596 tree type = TREE_TYPE (decl);
4597 tree id = DECL_NAME (decl);
4599 const char *name = IDENTIFIER_POINTER (id);
4600 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
4602 /* Should never be called on a symbol with a preexisting meaning. */
4603 gcc_assert (!I_SYMBOL_BINDING (id));
4605 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false,
4608 /* Builtins in the implementation namespace are made visible without
4609 needing to be explicitly declared. See push_file_scope. */
4610 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
4612 DECL_CHAIN (decl) = visible_builtins;
4613 visible_builtins = decl;
4620 c_builtin_function_ext_scope (tree decl)
4622 tree type = TREE_TYPE (decl);
4623 tree id = DECL_NAME (decl);
4625 const char *name = IDENTIFIER_POINTER (id);
4626 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
4629 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false,
4632 /* Builtins in the implementation namespace are made visible without
4633 needing to be explicitly declared. See push_file_scope. */
4634 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
4636 DECL_CHAIN (decl) = visible_builtins;
4637 visible_builtins = decl;
4643 /* Implement LANG_HOOKS_SIMULATE_BUILTIN_FUNCTION_DECL. */
4646 c_simulate_builtin_function_decl (tree decl)
4648 tree type = TREE_TYPE (decl);
4649 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
4650 return pushdecl (decl);
4653 /* Warn about attributes in a context where they are unused
4654 (attribute-declarations, except for the "fallthrough" case, and
4655 attributes on statements). */
4658 c_warn_unused_attributes (tree attrs)
4660 for (tree t = attrs; t != NULL_TREE; t = TREE_CHAIN (t))
4661 if (get_attribute_namespace (t) == NULL_TREE)
4662 /* The specifications of standard attributes mean this is a
4663 constraint violation. */
4664 pedwarn (input_location, OPT_Wattributes, "%qE attribute ignored",
4665 get_attribute_name (t));
4666 else if (!attribute_ignored_p (t))
4667 warning (OPT_Wattributes, "%qE attribute ignored",
4668 get_attribute_name (t));
4671 /* Warn for standard attributes being applied to a type that is not
4672 being defined, where that is a constraint violation, and return a
4673 list of attributes with them removed. */
4676 c_warn_type_attributes (tree attrs)
4678 tree *attr_ptr = &attrs;
4680 if (get_attribute_namespace (*attr_ptr) == NULL_TREE)
4682 pedwarn (input_location, OPT_Wattributes, "%qE attribute ignored",
4683 get_attribute_name (*attr_ptr));
4684 *attr_ptr = TREE_CHAIN (*attr_ptr);
4687 attr_ptr = &TREE_CHAIN (*attr_ptr);
4691 /* Called when a declaration is seen that contains no names to declare.
4692 If its type is a reference to a structure, union or enum inherited
4693 from a containing scope, shadow that tag name for the current scope
4694 with a forward reference.
4695 If its type defines a new named structure or union
4696 or defines an enum, it is valid but we need not do anything here.
4697 Otherwise, it is an error. */
4700 shadow_tag (const struct c_declspecs *declspecs)
4702 shadow_tag_warned (declspecs, 0);
4705 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
4708 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
4710 bool found_tag = false;
4712 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
4714 tree value = declspecs->type;
4715 enum tree_code code = TREE_CODE (value);
4717 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
4718 /* Used to test also that TYPE_SIZE (value) != 0.
4719 That caused warning for `struct foo;' at top level in the file. */
4721 tree name = TYPE_NAME (value);
4726 if (declspecs->restrict_p)
4728 error ("invalid use of %<restrict%>");
4732 if (name == NULL_TREE)
4734 if (warned != 1 && code != ENUMERAL_TYPE)
4735 /* Empty unnamed enum OK */
4737 pedwarn (input_location, 0,
4738 "unnamed struct/union that defines no instances");
4742 else if (declspecs->typespec_kind != ctsk_tagdef
4743 && declspecs->typespec_kind != ctsk_tagfirstref
4744 && declspecs->typespec_kind != ctsk_tagfirstref_attrs
4745 && declspecs->storage_class != csc_none)
4748 pedwarn (input_location, 0,
4749 "empty declaration with storage class specifier "
4750 "does not redeclare tag");
4752 pending_xref_error ();
4754 else if (declspecs->typespec_kind != ctsk_tagdef
4755 && declspecs->typespec_kind != ctsk_tagfirstref
4756 && declspecs->typespec_kind != ctsk_tagfirstref_attrs
4757 && (declspecs->const_p
4758 || declspecs->volatile_p
4759 || declspecs->atomic_p
4760 || declspecs->restrict_p
4761 || declspecs->address_space))
4764 pedwarn (input_location, 0,
4765 "empty declaration with type qualifier "
4766 "does not redeclare tag");
4768 pending_xref_error ();
4770 else if (declspecs->typespec_kind != ctsk_tagdef
4771 && declspecs->typespec_kind != ctsk_tagfirstref
4772 && declspecs->typespec_kind != ctsk_tagfirstref_attrs
4773 && declspecs->alignas_p)
4776 pedwarn (input_location, 0,
4777 "empty declaration with %<_Alignas%> "
4778 "does not redeclare tag");
4780 pending_xref_error ();
4784 pending_invalid_xref = NULL_TREE;
4785 t = lookup_tag (code, name, true, NULL);
4789 t = make_node (code);
4790 pushtag (input_location, name, t);
4796 if (warned != 1 && !in_system_header_at (input_location))
4798 pedwarn (input_location, 0,
4799 "useless type name in empty declaration");
4804 else if (warned != 1 && !in_system_header_at (input_location)
4805 && declspecs->typedef_p)
4807 pedwarn (input_location, 0, "useless type name in empty declaration");
4811 pending_invalid_xref = NULL_TREE;
4813 if (declspecs->inline_p)
4815 error ("%<inline%> in empty declaration");
4819 if (declspecs->noreturn_p)
4821 error ("%<_Noreturn%> in empty declaration");
4825 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
4827 error ("%<auto%> in file-scope empty declaration");
4831 if (current_scope == file_scope && declspecs->storage_class == csc_register)
4833 error ("%<register%> in file-scope empty declaration");
4837 if (!warned && !in_system_header_at (input_location)
4838 && declspecs->storage_class != csc_none)
4840 warning (0, "useless storage class specifier in empty declaration");
4844 if (!warned && !in_system_header_at (input_location) && declspecs->thread_p)
4846 warning (0, "useless %qs in empty declaration",
4847 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
4852 && !in_system_header_at (input_location)
4853 && (declspecs->const_p
4854 || declspecs->volatile_p
4855 || declspecs->atomic_p
4856 || declspecs->restrict_p
4857 || declspecs->address_space))
4859 warning (0, "useless type qualifier in empty declaration");
4863 if (!warned && !in_system_header_at (input_location)
4864 && declspecs->alignas_p)
4866 warning (0, "useless %<_Alignas%> in empty declaration");
4872 && (declspecs->typespec_kind == ctsk_tagref_attrs
4873 || declspecs->typespec_kind == ctsk_tagfirstref_attrs))
4875 /* Standard attributes after the "struct" or "union" keyword are
4876 only permitted when the contents of the type are defined, or
4877 in the form "struct-or-union attribute-specifier-sequence
4878 identifier;". If the ';' was not present, attributes were
4879 diagnosed in the parser. Here, ensure that any other useless
4880 elements of the declaration result in a pedwarn, not just a
4881 warning. Forward declarations of enum types are not part of
4882 standard C, but handle them the same. */
4883 pedwarn (input_location, 0,
4884 "invalid use of attributes in empty declaration");
4890 if (declspecs->declspecs_seen_p
4891 && !declspecs->non_std_attrs_seen_p)
4892 /* An attribute declaration (but not a fallthrough attribute
4893 declaration, which was handled separately); warn if there
4894 are any attributes being ignored (but not if the attributes
4896 c_warn_unused_attributes (declspecs->attrs);
4897 else if (!found_tag)
4898 pedwarn (input_location, 0, "empty declaration");
4903 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
4904 bits. SPECS represents declaration specifiers that the grammar
4905 only permits to contain type qualifiers and attributes. */
4908 quals_from_declspecs (const struct c_declspecs *specs)
4910 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
4911 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
4912 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0)
4913 | (specs->atomic_p ? TYPE_QUAL_ATOMIC : 0)
4914 | (ENCODE_QUAL_ADDR_SPACE (specs->address_space)));
4915 gcc_assert (!specs->type
4916 && !specs->decl_attr
4917 && specs->typespec_word == cts_none
4918 && specs->storage_class == csc_none
4919 && !specs->typedef_p
4920 && !specs->explicit_signed_p
4921 && !specs->deprecated_p
4922 && !specs->unavailable_p
4924 && !specs->long_long_p
4927 && !specs->unsigned_p
4928 && !specs->complex_p
4930 && !specs->noreturn_p
4931 && !specs->thread_p);
4935 /* Construct an array declarator. LOC is the location of the
4936 beginning of the array (usually the opening brace). EXPR is the
4937 expression inside [], or NULL_TREE. QUALS are the type qualifiers
4938 inside the [] (to be applied to the pointer to which a parameter
4939 array is converted). STATIC_P is true if "static" is inside the
4940 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
4941 VLA of unspecified length which is nevertheless a complete type,
4942 false otherwise. The field for the contained declarator is left to
4943 be filled in by set_array_declarator_inner. */
4945 struct c_declarator *
4946 build_array_declarator (location_t loc,
4947 tree expr, struct c_declspecs *quals, bool static_p,
4950 struct c_declarator *declarator = XOBNEW (&parser_obstack,
4951 struct c_declarator);
4952 declarator->id_loc = loc;
4953 declarator->kind = cdk_array;
4954 declarator->declarator = 0;
4955 declarator->u.array.dimen = expr;
4958 declarator->u.array.attrs = quals->attrs;
4959 declarator->u.array.quals = quals_from_declspecs (quals);
4963 declarator->u.array.attrs = NULL_TREE;
4964 declarator->u.array.quals = 0;
4966 declarator->u.array.static_p = static_p;
4967 declarator->u.array.vla_unspec_p = vla_unspec_p;
4968 if (static_p || quals != NULL)
4969 pedwarn_c90 (loc, OPT_Wpedantic,
4970 "ISO C90 does not support %<static%> or type "
4971 "qualifiers in parameter array declarators");
4973 pedwarn_c90 (loc, OPT_Wpedantic,
4974 "ISO C90 does not support %<[*]%> array declarators");
4977 if (!current_scope->parm_flag)
4980 error_at (loc, "%<[*]%> not allowed in other than "
4981 "function prototype scope");
4982 declarator->u.array.vla_unspec_p = false;
4985 current_scope->had_vla_unspec = true;
4990 /* Set the contained declarator of an array declarator. DECL is the
4991 declarator, as constructed by build_array_declarator; INNER is what
4992 appears on the left of the []. */
4994 struct c_declarator *
4995 set_array_declarator_inner (struct c_declarator *decl,
4996 struct c_declarator *inner)
4998 decl->declarator = inner;
5002 /* INIT is a constructor that forms DECL's initializer. If the final
5003 element initializes a flexible array field, add the size of that
5004 initializer to DECL's size. */
5007 add_flexible_array_elts_to_size (tree decl, tree init)
5011 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init)))
5014 elt = CONSTRUCTOR_ELTS (init)->last ().value;
5015 type = TREE_TYPE (elt);
5016 if (TREE_CODE (type) == ARRAY_TYPE
5017 && TYPE_SIZE (type) == NULL_TREE
5018 && TYPE_DOMAIN (type) != NULL_TREE
5019 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
5021 complete_array_type (&type, elt, false);
5023 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
5024 DECL_SIZE_UNIT (decl)
5025 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
5029 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
5030 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
5031 before the type name, and set *EXPR_CONST_OPERANDS, if
5032 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
5033 appear in a constant expression. */
5036 groktypename (struct c_type_name *type_name, tree *expr,
5037 bool *expr_const_operands)
5040 tree attrs = type_name->specs->attrs;
5042 type_name->specs->attrs = NULL_TREE;
5044 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
5045 false, NULL, &attrs, expr, expr_const_operands,
5048 /* Apply attributes. */
5049 attrs = c_warn_type_attributes (attrs);
5050 decl_attributes (&type, attrs, 0);
5055 /* Looks up the most recent pushed declaration corresponding to DECL. */
5058 lookup_last_decl (tree decl)
5060 tree last_decl = lookup_name (DECL_NAME (decl));
5062 last_decl = lookup_name_in_scope (DECL_NAME (decl), external_scope);
5066 /* Wrapper for decl_attributes that adds some implicit attributes
5067 to VAR_DECLs or FUNCTION_DECLs. */
5070 c_decl_attributes (tree *node, tree attributes, int flags)
5072 /* Add implicit "omp declare target" attribute if requested. */
5073 if (current_omp_declare_target_attribute
5074 && ((VAR_P (*node) && is_global_var (*node))
5075 || TREE_CODE (*node) == FUNCTION_DECL))
5077 if (VAR_P (*node) && !omp_mappable_type (TREE_TYPE (*node)))
5078 attributes = tree_cons (get_identifier ("omp declare target implicit"),
5079 NULL_TREE, attributes);
5082 attributes = tree_cons (get_identifier ("omp declare target"),
5083 NULL_TREE, attributes);
5084 attributes = tree_cons (get_identifier ("omp declare target block"),
5085 NULL_TREE, attributes);
5089 /* Look up the current declaration with all the attributes merged
5090 so far so that attributes on the current declaration that's
5091 about to be pushed that conflict with the former can be detected,
5092 diagnosed, and rejected as appropriate. */
5093 tree last_decl = lookup_last_decl (*node);
5094 return decl_attributes (node, attributes, flags, last_decl);
5098 /* Decode a declarator in an ordinary declaration or data definition.
5099 This is called as soon as the type information and variable name
5100 have been parsed, before parsing the initializer if any.
5101 Here we create the ..._DECL node, fill in its type,
5102 and put it on the list of decls for the current context.
5103 When nonnull, set *LASTLOC to the location of the prior declaration
5104 of the same entity if one exists.
5105 The ..._DECL node is returned as the value.
5107 Exception: for arrays where the length is not specified,
5108 the type is left null, to be filled in by `finish_decl'.
5110 Function definitions do not come here; they go to start_function
5111 instead. However, external and forward declarations of functions
5112 do go through here. Structure field declarations are done by
5113 grokfield and not through here. */
5116 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
5117 bool initialized, tree attributes, location_t *lastloc /* = NULL */)
5121 tree expr = NULL_TREE;
5122 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
5124 /* An object declared as __attribute__((unavailable)) suppresses
5125 warnings and errors from __attribute__((deprecated/unavailable))
5127 An object declared as __attribute__((deprecated)) suppresses
5128 warnings of uses of other deprecated items. */
5129 if (lookup_attribute ("unavailable", attributes))
5130 deprecated_state = UNAVAILABLE_DEPRECATED_SUPPRESS;
5131 else if (lookup_attribute ("deprecated", attributes))
5132 deprecated_state = DEPRECATED_SUPPRESS;
5134 decl = grokdeclarator (declarator, declspecs,
5135 NORMAL, initialized, NULL, &attributes, &expr, NULL,
5137 if (!decl || decl == error_mark_node)
5140 if (tree lastdecl = lastloc ? lookup_last_decl (decl) : NULL_TREE)
5141 if (lastdecl != error_mark_node)
5142 *lastloc = DECL_SOURCE_LOCATION (lastdecl);
5145 add_stmt (fold_convert (void_type_node, expr));
5147 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl))
5148 && TREE_PUBLIC (decl))
5149 warning (OPT_Wmain, "%q+D is usually a function", decl);
5152 /* Is it valid for this decl to have an initializer at all?
5153 If not, set INITIALIZED to zero, which will indirectly
5154 tell 'finish_decl' to ignore the initializer once it is parsed. */
5155 switch (TREE_CODE (decl))
5158 error ("typedef %qD is initialized (use %<__typeof__%> instead)", decl);
5159 initialized = false;
5163 error ("function %qD is initialized like a variable", decl);
5164 initialized = false;
5168 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
5169 error ("parameter %qD is initialized", decl);
5170 initialized = false;
5174 /* Don't allow initializations for incomplete types except for
5175 arrays which might be completed by the initialization. */
5177 /* This can happen if the array size is an undefined macro.
5178 We already gave a warning, so we don't need another one. */
5179 if (TREE_TYPE (decl) == error_mark_node)
5180 initialized = false;
5181 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
5183 /* A complete type is ok if size is fixed. If the size is
5184 variable, an empty initializer is OK and nonempty
5185 initializers will be diagnosed in the parser. */
5187 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
5189 error ("variable %qD has initializer but incomplete type", decl);
5190 initialized = false;
5196 if (current_scope == file_scope)
5197 TREE_STATIC (decl) = 1;
5199 /* Tell 'pushdecl' this is an initialized decl
5200 even though we don't yet have the initializer expression.
5201 Also tell 'finish_decl' it may store the real initializer. */
5202 DECL_INITIAL (decl) = error_mark_node;
5205 /* If this is a function declaration, write a record describing it to the
5206 prototypes file (if requested). */
5208 if (TREE_CODE (decl) == FUNCTION_DECL)
5209 gen_aux_info_record (decl, 0, 0, prototype_p (TREE_TYPE (decl)));
5211 /* ANSI specifies that a tentative definition which is not merged with
5212 a non-tentative definition behaves exactly like a definition with an
5213 initializer equal to zero. (Section 3.7.2)
5215 -fno-common gives strict ANSI behavior, though this tends to break
5216 a large body of code that grew up without this rule.
5218 Thread-local variables are never common, since there's no entrenched
5219 body of code to break, and it allows more efficient variable references
5220 in the presence of dynamic linking. */
5224 && TREE_PUBLIC (decl)
5225 && !DECL_THREAD_LOCAL_P (decl)
5227 DECL_COMMON (decl) = 1;
5229 /* Set attributes here so if duplicate decl, will have proper attributes. */
5230 c_decl_attributes (&decl, attributes, 0);
5232 /* Handle gnu_inline attribute. */
5233 if (declspecs->inline_p
5234 && !flag_gnu89_inline
5235 && TREE_CODE (decl) == FUNCTION_DECL
5236 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
5237 || current_function_decl))
5239 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
5241 else if (declspecs->storage_class != csc_static)
5242 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
5245 if (TREE_CODE (decl) == FUNCTION_DECL
5246 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
5248 struct c_declarator *ce = declarator;
5250 if (ce->kind == cdk_pointer)
5251 ce = declarator->declarator;
5252 if (ce->kind == cdk_function)
5254 tree args = ce->u.arg_info->parms;
5255 for (; args; args = DECL_CHAIN (args))
5257 tree type = TREE_TYPE (args);
5258 if (type && INTEGRAL_TYPE_P (type)
5259 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5260 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
5265 if (TREE_CODE (decl) == FUNCTION_DECL
5266 && DECL_DECLARED_INLINE_P (decl)
5267 && DECL_UNINLINABLE (decl)
5268 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
5269 warning (OPT_Wattributes, "inline function %q+D given attribute %qs",
5272 /* C99 6.7.4p3: An inline definition of a function with external
5273 linkage shall not contain a definition of a modifiable object
5274 with static storage duration... */
5276 && current_scope != file_scope
5277 && TREE_STATIC (decl)
5278 && !TREE_READONLY (decl)
5279 && DECL_DECLARED_INLINE_P (current_function_decl)
5280 && DECL_EXTERNAL (current_function_decl))
5281 record_inline_static (input_location, current_function_decl,
5282 decl, csi_modifiable);
5284 if (c_dialect_objc ()
5285 && VAR_OR_FUNCTION_DECL_P (decl))
5286 objc_check_global_decl (decl);
5288 /* Add this decl to the current scope.
5289 TEM may equal DECL or it may be a previous decl of the same name. */
5290 tem = pushdecl (decl);
5292 if (initialized && DECL_EXTERNAL (tem))
5294 DECL_EXTERNAL (tem) = 0;
5295 TREE_STATIC (tem) = 1;
5301 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
5302 DECL or the non-array element type if DECL is an uninitialized array.
5303 If that type has a const member, diagnose this. */
5306 diagnose_uninitialized_cst_member (tree decl, tree type)
5309 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
5312 if (TREE_CODE (field) != FIELD_DECL)
5314 field_type = strip_array_types (TREE_TYPE (field));
5316 if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST)
5318 auto_diagnostic_group d;
5319 if (warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
5320 "uninitialized const member in %qT is invalid in C++",
5321 strip_array_types (TREE_TYPE (decl))))
5322 inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field);
5325 if (RECORD_OR_UNION_TYPE_P (field_type))
5326 diagnose_uninitialized_cst_member (decl, field_type);
5330 /* Finish processing of a declaration;
5331 install its initial value.
5332 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
5333 If the length of an array type is not known before,
5334 it must be determined now, from the initial value, or it is an error.
5336 INIT_LOC is the location of the initial value. */
5339 finish_decl (tree decl, location_t init_loc, tree init,
5340 tree origtype, tree asmspec_tree)
5343 bool was_incomplete = (DECL_SIZE (decl) == NULL_TREE);
5344 const char *asmspec = 0;
5346 /* If a name was specified, get the string. */
5347 if (VAR_OR_FUNCTION_DECL_P (decl)
5348 && DECL_FILE_SCOPE_P (decl))
5349 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5351 asmspec = TREE_STRING_POINTER (asmspec_tree);
5354 && TREE_STATIC (decl)
5355 && global_bindings_p ())
5356 /* So decl is a global variable. Record the types it uses
5357 so that we can decide later to emit debug info for them. */
5358 record_types_used_by_current_var_decl (decl);
5360 /* If `start_decl' didn't like having an initialization, ignore it now. */
5361 if (init != NULL_TREE && DECL_INITIAL (decl) == NULL_TREE)
5364 /* Don't crash if parm is initialized. */
5365 if (TREE_CODE (decl) == PARM_DECL)
5369 store_init_value (init_loc, decl, init, origtype);
5371 if (c_dialect_objc () && (VAR_OR_FUNCTION_DECL_P (decl)
5372 || TREE_CODE (decl) == FIELD_DECL))
5373 objc_check_decl (decl);
5375 type = TREE_TYPE (decl);
5377 /* Deduce size of array from initialization, if not already known.
5378 This is only needed for an initialization in the current scope;
5379 it must not be done for a file-scope initialization of a
5380 declaration with external linkage, redeclared in an inner scope
5381 with the outer declaration shadowed in an intermediate scope. */
5382 if (TREE_CODE (type) == ARRAY_TYPE
5383 && TYPE_DOMAIN (type) == NULL_TREE
5384 && TREE_CODE (decl) != TYPE_DECL
5385 && !(TREE_PUBLIC (decl) && current_scope != file_scope))
5388 = (TREE_STATIC (decl)
5389 /* Even if pedantic, an external linkage array
5390 may have incomplete type at first. */
5391 ? pedantic && !TREE_PUBLIC (decl)
5392 : !DECL_EXTERNAL (decl));
5394 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
5397 /* Get the completed type made by complete_array_type. */
5398 type = TREE_TYPE (decl);
5403 error ("initializer fails to determine size of %q+D", decl);
5408 error ("array size missing in %q+D", decl);
5412 error ("zero or negative size array %q+D", decl);
5416 /* For global variables, update the copy of the type that
5417 exists in the binding. */
5418 if (TREE_PUBLIC (decl))
5420 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
5421 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
5422 b_ext = b_ext->shadowed;
5423 if (b_ext && TREE_CODE (decl) == TREE_CODE (b_ext->decl))
5425 if (b_ext->u.type && comptypes (b_ext->u.type, type))
5426 b_ext->u.type = composite_type (b_ext->u.type, type);
5428 b_ext->u.type = type;
5437 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
5438 TREE_TYPE (DECL_INITIAL (decl)) = type;
5440 relayout_decl (decl);
5443 /* Look for braced array initializers for character arrays and
5444 recursively convert them into STRING_CSTs. */
5445 if (tree init = DECL_INITIAL (decl))
5446 DECL_INITIAL (decl) = braced_lists_to_strings (type, init);
5450 if (init && TREE_CODE (init) == CONSTRUCTOR)
5451 add_flexible_array_elts_to_size (decl, init);
5453 complete_flexible_array_elts (DECL_INITIAL (decl));
5455 if (is_global_var (decl))
5457 type_context_kind context = (DECL_THREAD_LOCAL_P (decl)
5458 ? TCTX_THREAD_STORAGE
5459 : TCTX_STATIC_STORAGE);
5460 if (!verify_type_context (input_location, context, TREE_TYPE (decl)))
5461 TREE_TYPE (decl) = error_mark_node;
5464 if (DECL_SIZE (decl) == NULL_TREE && TREE_TYPE (decl) != error_mark_node
5465 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
5466 layout_decl (decl, 0);
5468 if (DECL_SIZE (decl) == NULL_TREE
5469 /* Don't give an error if we already gave one earlier. */
5470 && TREE_TYPE (decl) != error_mark_node
5471 && (TREE_STATIC (decl)
5472 /* A static variable with an incomplete type
5473 is an error if it is initialized.
5474 Also if it is not file scope.
5475 Otherwise, let it through, but if it is not `extern'
5476 then it may cause an error message later. */
5477 ? (DECL_INITIAL (decl) != NULL_TREE
5478 || !DECL_FILE_SCOPE_P (decl))
5479 /* An automatic variable with an incomplete type
5481 : !DECL_EXTERNAL (decl)))
5483 error ("storage size of %q+D isn%'t known", decl);
5484 TREE_TYPE (decl) = error_mark_node;
5487 if ((RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl))
5488 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
5489 && DECL_SIZE (decl) == NULL_TREE
5490 && TREE_STATIC (decl))
5491 incomplete_record_decls.safe_push (decl);
5493 if (is_global_var (decl)
5494 && DECL_SIZE (decl) != NULL_TREE
5495 && TREE_TYPE (decl) != error_mark_node)
5497 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
5498 constant_expression_warning (DECL_SIZE (decl));
5501 error ("storage size of %q+D isn%'t constant", decl);
5502 TREE_TYPE (decl) = error_mark_node;
5506 if (TREE_USED (type))
5508 TREE_USED (decl) = 1;
5509 DECL_READ_P (decl) = 1;
5513 /* If this is a function and an assembler name is specified, reset DECL_RTL
5514 so we can give it its new name. Also, update builtin_decl if it
5515 was a normal built-in. */
5516 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
5518 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5519 set_builtin_user_assembler_name (decl, asmspec);
5520 set_user_assembler_name (decl, asmspec);
5523 /* If #pragma weak was used, mark the decl weak now. */
5524 maybe_apply_pragma_weak (decl);
5526 /* Output the assembler code and/or RTL code for variables and functions,
5527 unless the type is an undefined structure or union.
5528 If not, it will get done when the type is completed. */
5530 if (VAR_OR_FUNCTION_DECL_P (decl))
5532 /* Determine the ELF visibility. */
5533 if (TREE_PUBLIC (decl))
5534 c_determine_visibility (decl);
5536 /* This is a no-op in c-lang.cc or something real in objc-act.cc. */
5537 if (c_dialect_objc ())
5538 objc_check_decl (decl);
5542 /* If this is not a static variable, issue a warning.
5543 It doesn't make any sense to give an ASMSPEC for an
5544 ordinary, non-register local variable. Historically,
5545 GCC has accepted -- but ignored -- the ASMSPEC in
5547 if (!DECL_FILE_SCOPE_P (decl)
5549 && !C_DECL_REGISTER (decl)
5550 && !TREE_STATIC (decl))
5551 warning (0, "ignoring %<asm%> specifier for non-static local "
5552 "variable %q+D", decl);
5554 set_user_assembler_name (decl, asmspec);
5557 if (DECL_FILE_SCOPE_P (decl))
5559 if (DECL_INITIAL (decl) == NULL_TREE
5560 || DECL_INITIAL (decl) == error_mark_node)
5561 /* Don't output anything
5562 when a tentative file-scope definition is seen.
5563 But at end of compilation, do output code for them. */
5564 DECL_DEFER_OUTPUT (decl) = 1;
5565 if (asmspec && VAR_P (decl) && C_DECL_REGISTER (decl))
5566 DECL_HARD_REGISTER (decl) = 1;
5567 rest_of_decl_compilation (decl, true, 0);
5569 if (TREE_CODE (decl) == FUNCTION_DECL)
5571 tree parms = DECL_ARGUMENTS (decl);
5572 const bool builtin = fndecl_built_in_p (decl);
5573 if (tree access = build_attr_access_from_parms (parms, !builtin))
5574 decl_attributes (&decl, access, 0);
5579 /* In conjunction with an ASMSPEC, the `register'
5580 keyword indicates that we should place the variable
5581 in a particular register. */
5582 if (asmspec && C_DECL_REGISTER (decl))
5584 DECL_HARD_REGISTER (decl) = 1;
5585 /* This cannot be done for a structure with volatile
5586 fields, on which DECL_REGISTER will have been
5588 if (!DECL_REGISTER (decl))
5589 error ("cannot put object with volatile field into register");
5592 if (TREE_CODE (decl) != FUNCTION_DECL)
5594 /* If we're building a variable sized type, and we might be
5595 reachable other than via the top of the current binding
5596 level, then create a new BIND_EXPR so that we deallocate
5597 the object at the right time. */
5598 /* Note that DECL_SIZE can be null due to errors. */
5599 if (DECL_SIZE (decl)
5600 && !TREE_CONSTANT (DECL_SIZE (decl))
5601 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
5604 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
5605 TREE_SIDE_EFFECTS (bind) = 1;
5607 BIND_EXPR_BODY (bind) = push_stmt_list ();
5609 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
5615 if (!DECL_FILE_SCOPE_P (decl))
5617 /* Recompute the RTL of a local array now
5618 if it used to be an incomplete type. */
5619 if (was_incomplete && !is_global_var (decl))
5621 /* If we used it already as memory, it must stay in memory. */
5622 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5623 /* If it's still incomplete now, no init will save it. */
5624 if (DECL_SIZE (decl) == NULL_TREE)
5625 DECL_INITIAL (decl) = NULL_TREE;
5630 if (TREE_CODE (decl) == TYPE_DECL)
5632 if (!DECL_FILE_SCOPE_P (decl)
5633 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
5634 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
5636 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
5639 /* Install a cleanup (aka destructor) if one was given. */
5640 if (VAR_P (decl) && !TREE_STATIC (decl))
5642 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
5645 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
5646 tree cleanup_decl = lookup_name (cleanup_id);
5648 vec<tree, va_gc> *v;
5650 /* Build "cleanup(&decl)" for the destructor. */
5651 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, false);
5653 v->quick_push (cleanup);
5654 cleanup = c_build_function_call_vec (DECL_SOURCE_LOCATION (decl),
5655 vNULL, cleanup_decl, v, NULL);
5658 /* Don't warn about decl unused; the cleanup uses it. */
5659 TREE_USED (decl) = 1;
5660 TREE_USED (cleanup_decl) = 1;
5661 DECL_READ_P (decl) = 1;
5663 push_cleanup (decl, cleanup, false);
5669 && !DECL_EXTERNAL (decl)
5670 && DECL_INITIAL (decl) == NULL_TREE)
5672 type = strip_array_types (type);
5673 if (TREE_READONLY (decl))
5674 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
5675 "uninitialized %<const %D%> is invalid in C++", decl);
5676 else if (RECORD_OR_UNION_TYPE_P (type)
5677 && C_TYPE_FIELDS_READONLY (type))
5678 diagnose_uninitialized_cst_member (decl, type);
5683 && lookup_attribute ("omp declare target implicit",
5684 DECL_ATTRIBUTES (decl)))
5686 DECL_ATTRIBUTES (decl)
5687 = remove_attribute ("omp declare target implicit",
5688 DECL_ATTRIBUTES (decl));
5689 if (!omp_mappable_type (TREE_TYPE (decl)))
5690 error ("%q+D in declare target directive does not have mappable type",
5692 else if (!lookup_attribute ("omp declare target",
5693 DECL_ATTRIBUTES (decl))
5694 && !lookup_attribute ("omp declare target link",
5695 DECL_ATTRIBUTES (decl)))
5697 DECL_ATTRIBUTES (decl)
5698 = tree_cons (get_identifier ("omp declare target"),
5699 NULL_TREE, DECL_ATTRIBUTES (decl));
5700 symtab_node *node = symtab_node::get (decl);
5703 node->offloadable = 1;
5704 if (ENABLE_OFFLOADING)
5706 g->have_offload = true;
5707 if (is_a <varpool_node *> (node))
5708 vec_safe_push (offload_vars, decl);
5714 /* This is the last point we can lower alignment so give the target the
5717 && !is_global_var (decl)
5718 && !DECL_HARD_REGISTER (decl))
5719 targetm.lower_local_decl_alignment (decl);
5721 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
5724 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
5725 EXPR is NULL or a pointer to an expression that needs to be
5726 evaluated for the side effects of array size expressions in the
5730 grokparm (const struct c_parm *parm, tree *expr)
5732 tree attrs = parm->attrs;
5733 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
5734 NULL, &attrs, expr, NULL, DEPRECATED_NORMAL);
5736 decl_attributes (&decl, attrs, 0);
5741 /* Return attribute "arg spec" corresponding to an array/VLA parameter
5742 described by PARM, concatenated onto attributes ATTRS.
5743 The spec consists of one dollar symbol for each specified variable
5744 bound, one asterisk for each unspecified variable bound, followed
5745 by at most one specification of the most significant bound of
5746 an ordinary array parameter. For ordinary arrays the specification
5747 is either the constant bound itself, or the space character for
5748 an array with an unspecified bound (the [] form). Finally, a chain
5749 of specified variable bounds is appended to the spec, starting with
5750 the most significant bound. For example, the PARM T a[2][m][3][n]
5751 will produce __attribute__((arg spec ("[$$2]", m, n)).
5752 For T a typedef for an array with variable bounds, the bounds are
5753 included in the specification in the expected order.
5754 No "arg spec" is created for parameters of pointer types, making
5755 a distinction between T(*)[N] (or, equivalently, T[][N]) and
5756 the T[M][N] form, all of which have the same type and are represented
5757 the same, but only the last of which gets an "arg spec" describing
5758 the most significant bound M. */
5761 get_parm_array_spec (const struct c_parm *parm, tree attrs)
5763 /* The attribute specification string, minor bound first. */
5766 /* A list of VLA variable bounds, major first, or null if unspecified
5768 tree vbchain = NULL_TREE;
5769 /* True for a pointer parameter. */
5770 bool pointer = false;
5771 /* True for an ordinary array with an unpecified bound. */
5772 bool nobound = false;
5774 /* Create a string representation for the bounds of the array/VLA. */
5775 for (c_declarator *pd = parm->declarator, *next; pd; pd = next)
5777 next = pd->declarator;
5778 while (next && next->kind == cdk_attrs)
5779 next = next->declarator;
5781 /* Remember if a pointer has been seen to avoid storing the constant
5783 if (pd->kind == cdk_pointer)
5786 if ((pd->kind == cdk_pointer || pd->kind == cdk_function)
5787 && (!next || next->kind == cdk_id))
5789 /* Do nothing for the common case of a pointer. The fact that
5790 the parameter is one can be deduced from the absence of
5791 an arg spec for it. */
5795 if (pd->kind == cdk_id)
5798 || !parm->specs->type
5799 || TREE_CODE (parm->specs->type) != ARRAY_TYPE
5800 || !TYPE_DOMAIN (parm->specs->type)
5801 || !TYPE_MAX_VALUE (TYPE_DOMAIN (parm->specs->type)))
5804 tree max = TYPE_MAX_VALUE (TYPE_DOMAIN (parm->specs->type));
5806 && TREE_CODE (max) == INTEGER_CST)
5808 /* Extract the upper bound from a parameter of an array type
5809 unless the parameter is an ordinary array of unspecified
5810 bound in which case a next iteration of the loop will
5812 if (spec.empty () || spec.end ()[-1] != ' ')
5814 if (!tree_fits_shwi_p (max))
5817 /* The upper bound is the value of the largest valid
5819 HOST_WIDE_INT n = tree_to_shwi (max) + 1;
5821 sprintf (buf, "%lu", (unsigned long)n);
5827 /* For a VLA typedef, create a list of its variable bounds and
5828 append it in the expected order to VBCHAIN. */
5829 tree tpbnds = NULL_TREE;
5830 for (tree type = parm->specs->type; TREE_CODE (type) == ARRAY_TYPE;
5831 type = TREE_TYPE (type))
5833 tree nelts = array_type_nelts (type);
5834 if (error_operand_p (nelts))
5836 if (TREE_CODE (nelts) != INTEGER_CST)
5838 /* Each variable VLA bound is represented by the dollar
5841 tpbnds = tree_cons (NULL_TREE, nelts, tpbnds);
5844 tpbnds = nreverse (tpbnds);
5845 vbchain = chainon (vbchain, tpbnds);
5849 if (pd->kind != cdk_array)
5852 if (pd->u.array.vla_unspec_p)
5854 /* Each unspecified bound is represented by a star. There
5855 can be any number of these in a declaration (but none in
5861 tree nelts = pd->u.array.dimen;
5864 /* Ordinary array of unspecified size. There can be at most
5865 one for the most significant bound. Exit on the next
5866 iteration which determines whether or not PARM is declared
5867 as a pointer or an array. */
5872 if (pd->u.array.static_p)
5875 if (!INTEGRAL_TYPE_P (TREE_TYPE (nelts)))
5876 /* Avoid invalid NELTS. */
5880 nelts = c_fully_fold (nelts, false, nullptr);
5881 if (TREE_CODE (nelts) == INTEGER_CST)
5883 /* Skip all constant bounds except the most significant one.
5884 The interior ones are included in the array type. */
5885 if (next && (next->kind == cdk_array || next->kind == cdk_pointer))
5888 if (!tree_fits_uhwi_p (nelts))
5889 /* Bail completely on invalid bounds. */
5893 unsigned HOST_WIDE_INT n = tree_to_uhwi (nelts);
5894 sprintf (buf, "%llu", (unsigned long long)n);
5899 /* Each variable VLA bound is represented by a dollar sign. */
5901 vbchain = tree_cons (NULL_TREE, nelts, vbchain);
5904 if (spec.empty () && !nobound)
5907 spec.insert (0, "[");
5909 /* Ordinary array of unspecified bound is represented by a space.
5910 It must be last in the spec. */
5914 tree acsstr = build_string (spec.length () + 1, spec.c_str ());
5915 tree args = tree_cons (NULL_TREE, acsstr, vbchain);
5916 tree name = get_identifier ("arg spec");
5917 return tree_cons (name, args, attrs);
5920 /* Given a parsed parameter declaration, decode it into a PARM_DECL
5921 and push that on the current scope. EXPR is a pointer to an
5922 expression that needs to be evaluated for the side effects of array
5923 size expressions in the parameters. */
5926 push_parm_decl (const struct c_parm *parm, tree *expr)
5928 tree attrs = parm->attrs;
5929 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
5930 &attrs, expr, NULL, DEPRECATED_NORMAL);
5931 if (decl && DECL_P (decl))
5932 DECL_SOURCE_LOCATION (decl) = parm->loc;
5934 attrs = get_parm_array_spec (parm, attrs);
5935 decl_attributes (&decl, attrs, 0);
5937 decl = pushdecl (decl);
5939 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
5942 /* Mark all the parameter declarations to date as forward decls.
5943 Also diagnose use of this extension. */
5946 mark_forward_parm_decls (void)
5948 struct c_binding *b;
5950 if (pedantic && !current_scope->warned_forward_parm_decls)
5952 pedwarn (input_location, OPT_Wpedantic,
5953 "ISO C forbids forward parameter declarations");
5954 current_scope->warned_forward_parm_decls = true;
5957 for (b = current_scope->bindings; b; b = b->prev)
5958 if (TREE_CODE (b->decl) == PARM_DECL)
5959 TREE_ASM_WRITTEN (b->decl) = 1;
5962 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5963 literal, which may be an incomplete array type completed by the
5964 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5965 literal. NON_CONST is true if the initializers contain something
5966 that cannot occur in a constant expression. If ALIGNAS_ALIGN is nonzero,
5967 it is the (valid) alignment for this compound literal, as specified
5971 build_compound_literal (location_t loc, tree type, tree init, bool non_const,
5972 unsigned int alignas_align)
5974 /* We do not use start_decl here because we have a type, not a declarator;
5975 and do not use finish_decl because the decl should be stored inside
5976 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5981 if (type == error_mark_node
5982 || init == error_mark_node)
5983 return error_mark_node;
5985 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
5986 DECL_EXTERNAL (decl) = 0;
5987 TREE_PUBLIC (decl) = 0;
5988 TREE_STATIC (decl) = (current_scope == file_scope);
5989 DECL_CONTEXT (decl) = current_function_decl;
5990 TREE_USED (decl) = 1;
5991 DECL_READ_P (decl) = 1;
5992 DECL_ARTIFICIAL (decl) = 1;
5993 DECL_IGNORED_P (decl) = 1;
5994 C_DECL_COMPOUND_LITERAL_P (decl) = 1;
5995 TREE_TYPE (decl) = type;
5996 c_apply_type_quals_to_decl (TYPE_QUALS (strip_array_types (type)), decl);
5999 SET_DECL_ALIGN (decl, alignas_align * BITS_PER_UNIT);
6000 DECL_USER_ALIGN (decl) = 1;
6002 store_init_value (loc, decl, init, NULL_TREE);
6004 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
6006 int failure = complete_array_type (&TREE_TYPE (decl),
6007 DECL_INITIAL (decl), true);
6008 /* If complete_array_type returns 3, it means that the
6009 initial value of the compound literal is empty. Allow it. */
6010 gcc_assert (failure == 0 || failure == 3);
6012 type = TREE_TYPE (decl);
6013 TREE_TYPE (DECL_INITIAL (decl)) = type;
6016 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
6018 c_incomplete_type_error (loc, NULL_TREE, type);
6019 return error_mark_node;
6022 if (TREE_STATIC (decl)
6023 && !verify_type_context (loc, TCTX_STATIC_STORAGE, type))
6024 return error_mark_node;
6026 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
6027 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
6028 TREE_SIDE_EFFECTS (complit) = 1;
6030 layout_decl (decl, 0);
6032 if (TREE_STATIC (decl))
6034 /* This decl needs a name for the assembler output. */
6035 set_compound_literal_name (decl);
6036 DECL_DEFER_OUTPUT (decl) = 1;
6037 DECL_COMDAT (decl) = 1;
6039 rest_of_decl_compilation (decl, 1, 0);
6041 else if (current_function_decl && !current_scope->parm_flag)
6046 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
6047 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
6053 /* Check the type of a compound literal. Here we just check that it
6054 is valid for C++. */
6057 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
6060 && (type_name->specs->typespec_kind == ctsk_tagdef
6061 || type_name->specs->typespec_kind == ctsk_tagfirstref
6062 || type_name->specs->typespec_kind == ctsk_tagfirstref_attrs))
6063 warning_at (loc, OPT_Wc___compat,
6064 "defining a type in a compound literal is invalid in C++");
6067 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
6068 replacing with appropriate values if they are invalid. */
6071 check_bitfield_type_and_width (location_t loc, tree *type, tree *width,
6075 unsigned int max_width;
6076 unsigned HOST_WIDE_INT w;
6077 const char *name = (orig_name
6078 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
6079 : _("<anonymous>"));
6081 /* Detect and ignore out of range field width and process valid
6083 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)))
6085 error_at (loc, "bit-field %qs width not an integer constant", name);
6086 *width = integer_one_node;
6090 if (TREE_CODE (*width) != INTEGER_CST)
6092 *width = c_fully_fold (*width, false, NULL);
6093 if (TREE_CODE (*width) == INTEGER_CST)
6094 pedwarn (loc, OPT_Wpedantic,
6095 "bit-field %qs width not an integer constant expression",
6098 if (TREE_CODE (*width) != INTEGER_CST)
6100 error_at (loc, "bit-field %qs width not an integer constant", name);
6101 *width = integer_one_node;
6103 constant_expression_warning (*width);
6104 if (tree_int_cst_sgn (*width) < 0)
6106 error_at (loc, "negative width in bit-field %qs", name);
6107 *width = integer_one_node;
6109 else if (integer_zerop (*width) && orig_name)
6111 error_at (loc, "zero width for bit-field %qs", name);
6112 *width = integer_one_node;
6116 /* Detect invalid bit-field type. */
6117 if (TREE_CODE (*type) != INTEGER_TYPE
6118 && TREE_CODE (*type) != BOOLEAN_TYPE
6119 && TREE_CODE (*type) != ENUMERAL_TYPE)
6121 error_at (loc, "bit-field %qs has invalid type", name);
6122 *type = unsigned_type_node;
6125 if (TYPE_WARN_IF_NOT_ALIGN (*type))
6127 error_at (loc, "cannot declare bit-field %qs with %<warn_if_not_aligned%> type",
6129 *type = unsigned_type_node;
6132 type_mv = TYPE_MAIN_VARIANT (*type);
6133 if (!in_system_header_at (input_location)
6134 && type_mv != integer_type_node
6135 && type_mv != unsigned_type_node
6136 && type_mv != boolean_type_node)
6137 pedwarn_c90 (loc, OPT_Wpedantic,
6138 "type of bit-field %qs is a GCC extension", name);
6140 max_width = TYPE_PRECISION (*type);
6142 if (compare_tree_int (*width, max_width) > 0)
6144 error_at (loc, "width of %qs exceeds its type", name);
6146 *width = build_int_cst (integer_type_node, w);
6149 w = tree_to_uhwi (*width);
6151 if (TREE_CODE (*type) == ENUMERAL_TYPE)
6153 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
6155 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_SIGN (*type))
6156 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_SIGN (*type)))
6157 warning_at (loc, 0, "%qs is narrower than values of its type", name);
6163 /* Print warning about variable length array if necessary. */
6166 warn_variable_length_array (tree name, tree size)
6168 if (TREE_CONSTANT (size))
6171 pedwarn_c90 (input_location, OPT_Wvla,
6172 "ISO C90 forbids array %qE whose size "
6173 "cannot be evaluated", name);
6175 pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids array "
6176 "whose size cannot be evaluated");
6181 pedwarn_c90 (input_location, OPT_Wvla,
6182 "ISO C90 forbids variable length array %qE", name);
6184 pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids variable "
6189 /* Print warning about defaulting to int if necessary. */
6192 warn_defaults_to (location_t location, int opt, const char *gmsgid, ...)
6194 diagnostic_info diagnostic;
6196 rich_location richloc (line_table, location);
6198 va_start (ap, gmsgid);
6199 diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
6200 flag_isoc99 ? DK_PEDWARN : DK_WARNING);
6201 diagnostic.option_index = opt;
6202 diagnostic_report_diagnostic (global_dc, &diagnostic);
6206 /* Returns the smallest location != UNKNOWN_LOCATION in LOCATIONS,
6207 considering only those c_declspec_words found in LIST, which
6208 must be terminated by cdw_number_of_elements. */
6211 smallest_type_quals_location (const location_t *locations,
6212 const c_declspec_word *list)
6214 location_t loc = UNKNOWN_LOCATION;
6215 while (*list != cdw_number_of_elements)
6217 location_t newloc = locations[*list];
6218 if (loc == UNKNOWN_LOCATION
6219 || (newloc != UNKNOWN_LOCATION && newloc < loc))
6227 /* Given declspecs and a declarator,
6228 determine the name and type of the object declared
6229 and construct a ..._DECL node for it.
6230 (In one case we can return a ..._TYPE node instead.
6231 For invalid input we sometimes return NULL_TREE.)
6233 DECLSPECS is a c_declspecs structure for the declaration specifiers.
6235 DECL_CONTEXT says which syntactic context this declaration is in:
6236 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6237 FUNCDEF for a function definition. Like NORMAL but a few different
6238 error messages in each case. Return value may be zero meaning
6239 this definition is too screwy to try to parse.
6240 PARM for a parameter declaration (either within a function prototype
6241 or before a function body). Make a PARM_DECL, or return void_type_node.
6242 TYPENAME if for a typename (in a cast or sizeof).
6243 Don't make a DECL node; just return the ..._TYPE node.
6244 FIELD for a struct or union field; make a FIELD_DECL.
6245 INITIALIZED is true if the decl has an initializer.
6246 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
6247 representing the width of the bit-field.
6248 DECL_ATTRS points to the list of attributes that should be added to this
6249 decl. Any nested attributes that belong on the decl itself will be
6251 If EXPR is not NULL, any expressions that need to be evaluated as
6252 part of evaluating variably modified types will be stored in *EXPR.
6253 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
6254 set to indicate whether operands in *EXPR can be used in constant
6256 DEPRECATED_STATE is a deprecated_states value indicating whether
6257 deprecation/unavailability warnings should be suppressed.
6259 In the TYPENAME case, DECLARATOR is really an absolute declarator.
6260 It may also be so in the PARM case, for a prototype where the
6261 argument type is specified but not the name.
6263 This function is where the complicated C meanings of `static'
6264 and `extern' are interpreted. */
6267 grokdeclarator (const struct c_declarator *declarator,
6268 struct c_declspecs *declspecs,
6269 enum decl_context decl_context, bool initialized, tree *width,
6270 tree *decl_attrs, tree *expr, bool *expr_const_operands,
6271 enum deprecated_states deprecated_state)
6273 tree type = declspecs->type;
6274 bool threadp = declspecs->thread_p;
6275 enum c_storage_class storage_class = declspecs->storage_class;
6280 int type_quals = TYPE_UNQUALIFIED;
6281 tree name = NULL_TREE;
6282 bool funcdef_flag = false;
6283 bool funcdef_syntax = false;
6284 bool size_varies = false;
6285 tree decl_attr = declspecs->decl_attr;
6286 int array_ptr_quals = TYPE_UNQUALIFIED;
6287 tree array_ptr_attrs = NULL_TREE;
6288 bool array_parm_static = false;
6289 bool array_parm_vla_unspec_p = false;
6290 tree returned_attrs = NULL_TREE;
6291 tree decl_id_attrs = NULL_TREE;
6292 bool bitfield = width != NULL;
6294 tree orig_qual_type = NULL;
6295 size_t orig_qual_indirect = 0;
6296 struct c_arg_info *arg_info = 0;
6297 addr_space_t as1, as2, address_space;
6298 location_t loc = UNKNOWN_LOCATION;
6300 bool expr_const_operands_dummy;
6301 enum c_declarator_kind first_non_attr_kind;
6302 unsigned int alignas_align = 0;
6304 if (TREE_CODE (type) == ERROR_MARK)
6305 return error_mark_node;
6309 expr_dummy = NULL_TREE;
6311 if (expr_const_operands == NULL)
6312 expr_const_operands = &expr_const_operands_dummy;
6314 if (declspecs->expr)
6317 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (declspecs->expr), *expr,
6320 *expr = declspecs->expr;
6322 *expr_const_operands = declspecs->expr_const_operands;
6324 if (decl_context == FUNCDEF)
6325 funcdef_flag = true, decl_context = NORMAL;
6327 /* Look inside a declarator for the name being declared
6328 and get it as an IDENTIFIER_NODE, for an error message. */
6330 const struct c_declarator *decl = declarator;
6332 first_non_attr_kind = cdk_attrs;
6342 funcdef_syntax = (decl->kind == cdk_function);
6343 if (first_non_attr_kind == cdk_attrs)
6344 first_non_attr_kind = decl->kind;
6345 decl = decl->declarator;
6349 decl = decl->declarator;
6355 name = decl->u.id.id;
6356 decl_id_attrs = decl->u.id.attrs;
6357 if (first_non_attr_kind == cdk_attrs)
6358 first_non_attr_kind = decl->kind;
6365 if (name == NULL_TREE)
6367 gcc_assert (decl_context == PARM
6368 || decl_context == TYPENAME
6369 || (decl_context == FIELD
6370 && declarator->kind == cdk_id));
6371 gcc_assert (!initialized);
6375 /* A function definition's declarator must have the form of
6376 a function declarator. */
6378 if (funcdef_flag && !funcdef_syntax)
6381 /* If this looks like a function definition, make it one,
6382 even if it occurs where parms are expected.
6383 Then store_parm_decls will reject it and not use it as a parm. */
6384 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
6385 decl_context = PARM;
6387 if (deprecated_state != UNAVAILABLE_DEPRECATED_SUPPRESS)
6389 if (declspecs->unavailable_p)
6390 error_unavailable_use (declspecs->type, declspecs->decl_attr);
6391 else if (declspecs->deprecated_p
6392 && deprecated_state != DEPRECATED_SUPPRESS)
6393 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
6396 if ((decl_context == NORMAL || decl_context == FIELD)
6397 && current_scope == file_scope
6398 && variably_modified_type_p (type, NULL_TREE))
6401 error_at (loc, "variably modified %qE at file scope", name);
6403 error_at (loc, "variably modified field at file scope");
6404 type = integer_type_node;
6407 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
6409 /* Diagnose defaulting to "int". */
6411 if (declspecs->default_int_p && !in_system_header_at (input_location))
6413 /* Issue a warning if this is an ISO C 99 program or if
6414 -Wreturn-type and this is a function, or if -Wimplicit;
6415 prefer the former warning since it is more explicit. */
6416 if ((warn_implicit_int || warn_return_type > 0 || flag_isoc99)
6418 warn_about_return_type = 1;
6422 warn_defaults_to (loc, OPT_Wimplicit_int,
6423 "type defaults to %<int%> in declaration "
6426 warn_defaults_to (loc, OPT_Wimplicit_int,
6427 "type defaults to %<int%> in type name");
6431 /* Adjust the type if a bit-field is being declared,
6432 -funsigned-bitfields applied and the type is not explicitly
6434 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
6435 && TREE_CODE (type) == INTEGER_TYPE)
6436 type = unsigned_type_for (type);
6438 /* Figure out the type qualifiers for the declaration. There are
6439 two ways a declaration can become qualified. One is something
6440 like `const int i' where the `const' is explicit. Another is
6441 something like `typedef const int CI; CI i' where the type of the
6442 declaration contains the `const'. A third possibility is that
6443 there is a type qualifier on the element type of a typedefed
6444 array type, in which case we should extract that qualifier so
6445 that c_apply_type_quals_to_decl receives the full list of
6446 qualifiers to work with (C90 is not entirely clear about whether
6447 duplicate qualifiers should be diagnosed in this case, but it
6448 seems most appropriate to do so). */
6449 element_type = strip_array_types (type);
6450 constp = declspecs->const_p + TYPE_READONLY (element_type);
6451 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
6452 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
6453 atomicp = declspecs->atomic_p + TYPE_ATOMIC (element_type);
6454 as1 = declspecs->address_space;
6455 as2 = TYPE_ADDR_SPACE (element_type);
6456 address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1;
6459 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<const%>");
6461 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<restrict%>");
6463 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<volatile%>");
6465 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<_Atomic%>");
6467 if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2)
6468 error_at (loc, "conflicting named address spaces (%s vs %s)",
6469 c_addr_space_name (as1), c_addr_space_name (as2));
6471 if ((TREE_CODE (type) == ARRAY_TYPE
6472 || first_non_attr_kind == cdk_array)
6473 && TYPE_QUALS (element_type))
6475 orig_qual_type = type;
6476 type = TYPE_MAIN_VARIANT (type);
6478 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
6479 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
6480 | (volatilep ? TYPE_QUAL_VOLATILE : 0)
6481 | (atomicp ? TYPE_QUAL_ATOMIC : 0)
6482 | ENCODE_QUAL_ADDR_SPACE (address_space));
6483 if (type_quals != TYPE_QUALS (element_type))
6484 orig_qual_type = NULL_TREE;
6486 /* Applying the _Atomic qualifier to an array type (through the use
6487 of typedefs or typeof) must be detected here. If the qualifier
6488 is introduced later, any appearance of applying it to an array is
6489 actually applying it to an element of that array. */
6490 if (declspecs->atomic_p && TREE_CODE (type) == ARRAY_TYPE)
6491 error_at (loc, "%<_Atomic%>-qualified array type");
6493 /* Warn about storage classes that are invalid for certain
6494 kinds of declarations (parameters, typenames, etc.). */
6498 || storage_class == csc_auto
6499 || storage_class == csc_register
6500 || storage_class == csc_typedef))
6502 if (storage_class == csc_auto)
6504 (current_scope == file_scope) ? 0 : OPT_Wpedantic,
6505 "function definition declared %<auto%>");
6506 if (storage_class == csc_register)
6507 error_at (loc, "function definition declared %<register%>");
6508 if (storage_class == csc_typedef)
6509 error_at (loc, "function definition declared %<typedef%>");
6511 error_at (loc, "function definition declared %qs",
6512 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
6514 if (storage_class == csc_auto
6515 || storage_class == csc_register
6516 || storage_class == csc_typedef)
6517 storage_class = csc_none;
6519 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
6521 if (decl_context == PARM && storage_class == csc_register)
6525 switch (decl_context)
6529 error_at (loc, "storage class specified for structure "
6532 error_at (loc, "storage class specified for structure field");
6536 error_at (loc, "storage class specified for parameter %qE",
6539 error_at (loc, "storage class specified for unnamed parameter");
6542 error_at (loc, "storage class specified for typename");
6545 storage_class = csc_none;
6549 else if (storage_class == csc_extern
6553 /* 'extern' with initialization is invalid if not at file scope. */
6554 if (current_scope == file_scope)
6556 /* It is fine to have 'extern const' when compiling at C
6557 and C++ intersection. */
6558 if (!(warn_cxx_compat && constp))
6559 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
6563 error_at (loc, "%qE has both %<extern%> and initializer", name);
6565 else if (current_scope == file_scope)
6567 if (storage_class == csc_auto)
6568 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
6570 if (pedantic && storage_class == csc_register)
6571 pedwarn (input_location, OPT_Wpedantic,
6572 "file-scope declaration of %qE specifies %<register%>", name);
6576 if (storage_class == csc_extern && funcdef_flag)
6577 error_at (loc, "nested function %qE declared %<extern%>", name);
6578 else if (threadp && storage_class == csc_none)
6580 error_at (loc, "function-scope %qE implicitly auto and declared "
6582 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
6587 /* Now figure out the structure of the declarator proper.
6588 Descend through it, creating more complex types, until we reach
6589 the declared identifier (or NULL_TREE, in an absolute declarator).
6590 At each stage we maintain an unqualified version of the type
6591 together with any qualifiers that should be applied to it with
6592 c_build_qualified_type; this way, array types including
6593 multidimensional array types are first built up in unqualified
6594 form and then the qualified form is created with
6595 TYPE_MAIN_VARIANT pointing to the unqualified form. */
6597 while (declarator && declarator->kind != cdk_id)
6599 if (type == error_mark_node)
6601 declarator = declarator->declarator;
6605 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
6606 a cdk_pointer (for *...),
6607 a cdk_function (for ...(...)),
6608 a cdk_attrs (for nested attributes),
6609 or a cdk_id (for the name being declared
6610 or the place in an absolute declarator
6611 where the name was omitted).
6612 For the last case, we have just exited the loop.
6614 At this point, TYPE is the type of elements of an array,
6615 or for a function to return, or for a pointer to point to.
6616 After this sequence of ifs, TYPE is the type of the
6617 array or function or pointer, and DECLARATOR has had its
6618 outermost layer removed. */
6620 if (array_ptr_quals != TYPE_UNQUALIFIED
6621 || array_ptr_attrs != NULL_TREE
6622 || array_parm_static)
6624 /* Only the innermost declarator (making a parameter be of
6625 array type which is converted to pointer type)
6626 may have static or type qualifiers. */
6627 error_at (loc, "static or type qualifiers in non-parameter array declarator");
6628 array_ptr_quals = TYPE_UNQUALIFIED;
6629 array_ptr_attrs = NULL_TREE;
6630 array_parm_static = false;
6633 switch (declarator->kind)
6637 /* A declarator with embedded attributes. */
6638 tree attrs = declarator->u.attrs;
6639 const struct c_declarator *inner_decl;
6641 declarator = declarator->declarator;
6642 /* Standard attribute syntax precisely defines what entity
6643 an attribute in each position appertains to, so only
6644 apply laxity about positioning to GNU attribute syntax.
6645 Standard attributes applied to a function or array
6646 declarator apply exactly to that type; standard
6647 attributes applied to the identifier apply to the
6648 declaration rather than to the type, and are specified
6649 using a cdk_id declarator rather than using
6651 inner_decl = declarator;
6652 while (inner_decl->kind == cdk_attrs)
6653 inner_decl = inner_decl->declarator;
6654 if (!cxx11_attribute_p (attrs))
6656 if (inner_decl->kind == cdk_id)
6657 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
6658 else if (inner_decl->kind == cdk_function)
6659 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
6660 else if (inner_decl->kind == cdk_array)
6661 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
6663 attrs = c_warn_type_attributes (attrs);
6664 returned_attrs = decl_attributes (&type,
6665 chainon (returned_attrs, attrs),
6671 tree itype = NULL_TREE;
6672 tree size = declarator->u.array.dimen;
6673 /* The index is a signed object `sizetype' bits wide. */
6674 tree index_type = c_common_signed_type (sizetype);
6676 array_ptr_quals = declarator->u.array.quals;
6677 array_ptr_attrs = declarator->u.array.attrs;
6678 array_parm_static = declarator->u.array.static_p;
6679 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
6681 declarator = declarator->declarator;
6683 /* Check for some types that there cannot be arrays of. */
6685 if (VOID_TYPE_P (type))
6688 error_at (loc, "declaration of %qE as array of voids", name);
6690 error_at (loc, "declaration of type name as array of voids");
6691 type = error_mark_node;
6694 if (TREE_CODE (type) == FUNCTION_TYPE)
6697 error_at (loc, "declaration of %qE as array of functions",
6700 error_at (loc, "declaration of type name as array of "
6702 type = error_mark_node;
6705 if (pedantic && !in_system_header_at (input_location)
6706 && flexible_array_type_p (type))
6707 pedwarn (loc, OPT_Wpedantic,
6708 "invalid use of structure with flexible array member");
6710 if (size == error_mark_node)
6711 type = error_mark_node;
6713 if (type == error_mark_node)
6716 if (!verify_type_context (loc, TCTX_ARRAY_ELEMENT, type))
6718 type = error_mark_node;
6722 /* If size was specified, set ITYPE to a range-type for
6723 that size. Otherwise, ITYPE remains null. finish_decl
6724 may figure it out from an initial value. */
6728 bool size_maybe_const = true;
6729 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
6730 && !TREE_OVERFLOW (size));
6731 bool this_size_varies = false;
6733 /* Strip NON_LVALUE_EXPRs since we aren't using as an
6735 STRIP_TYPE_NOPS (size);
6737 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
6740 error_at (loc, "size of array %qE has non-integer type",
6744 "size of unnamed array has non-integer type");
6745 size = integer_one_node;
6746 size_int_const = true;
6748 /* This can happen with enum forward declaration. */
6749 else if (!COMPLETE_TYPE_P (TREE_TYPE (size)))
6752 error_at (loc, "size of array %qE has incomplete type",
6755 error_at (loc, "size of unnamed array has incomplete "
6757 size = integer_one_node;
6758 size_int_const = true;
6761 size = c_fully_fold (size, false, &size_maybe_const);
6763 if (pedantic && size_maybe_const && integer_zerop (size))
6766 pedwarn (loc, OPT_Wpedantic,
6767 "ISO C forbids zero-size array %qE", name);
6769 pedwarn (loc, OPT_Wpedantic,
6770 "ISO C forbids zero-size array");
6773 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
6775 constant_expression_warning (size);
6776 if (tree_int_cst_sgn (size) < 0)
6779 error_at (loc, "size of array %qE is negative", name);
6781 error_at (loc, "size of unnamed array is negative");
6782 size = integer_one_node;
6783 size_int_const = true;
6785 /* Handle a size folded to an integer constant but
6786 not an integer constant expression. */
6787 if (!size_int_const)
6789 /* If this is a file scope declaration of an
6790 ordinary identifier, this is invalid code;
6791 diagnosing it here and not subsequently
6792 treating the type as variable-length avoids
6793 more confusing diagnostics later. */
6794 if ((decl_context == NORMAL || decl_context == FIELD)
6795 && current_scope == file_scope)
6796 pedwarn (input_location, 0,
6797 "variably modified %qE at file scope",
6800 this_size_varies = size_varies = true;
6801 warn_variable_length_array (name, size);
6804 else if ((decl_context == NORMAL || decl_context == FIELD)
6805 && current_scope == file_scope)
6807 error_at (loc, "variably modified %qE at file scope", name);
6808 size = integer_one_node;
6812 /* Make sure the array size remains visibly
6813 nonconstant even if it is (eg) a const variable
6814 with known value. */
6815 this_size_varies = size_varies = true;
6816 warn_variable_length_array (name, size);
6817 if (sanitize_flags_p (SANITIZE_VLA)
6818 && current_function_decl != NULL_TREE
6819 && decl_context == NORMAL)
6821 /* Evaluate the array size only once. */
6822 size = save_expr (size);
6823 size = c_fully_fold (size, false, NULL);
6824 size = fold_build2 (COMPOUND_EXPR, TREE_TYPE (size),
6825 ubsan_instrument_vla (loc, size),
6830 if (integer_zerop (size) && !this_size_varies)
6832 /* A zero-length array cannot be represented with
6833 an unsigned index type, which is what we'll
6834 get with build_index_type. Create an
6835 open-ended range instead. */
6836 itype = build_range_type (sizetype, size, NULL_TREE);
6840 /* Arrange for the SAVE_EXPR on the inside of the
6841 MINUS_EXPR, which allows the -1 to get folded
6842 with the +1 that happens when building TYPE_SIZE. */
6844 size = save_expr (size);
6845 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
6846 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
6847 integer_zero_node, size);
6849 /* Compute the maximum valid index, that is, size
6850 - 1. Do the calculation in index_type, so that
6851 if it is a variable the computations will be
6852 done in the proper mode. */
6853 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
6854 convert (index_type, size),
6855 convert (index_type,
6858 /* The above overflows when size does not fit
6860 ??? While a size of INT_MAX+1 technically shouldn't
6861 cause an overflow (because we subtract 1), handling
6862 this case seems like an unnecessary complication. */
6863 if (TREE_CODE (size) == INTEGER_CST
6864 && !int_fits_type_p (size, index_type))
6867 error_at (loc, "size of array %qE is too large",
6870 error_at (loc, "size of unnamed array is too large");
6871 type = error_mark_node;
6875 itype = build_index_type (itype);
6877 if (this_size_varies)
6879 if (TREE_SIDE_EFFECTS (size))
6882 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
6887 *expr_const_operands &= size_maybe_const;
6890 else if (decl_context == FIELD)
6892 bool flexible_array_member = false;
6893 if (array_parm_vla_unspec_p)
6894 /* Field names can in fact have function prototype
6895 scope so [*] is disallowed here through making
6896 the field variably modified, not through being
6897 something other than a declaration with function
6902 const struct c_declarator *t = declarator;
6903 while (t->kind == cdk_attrs)
6905 flexible_array_member = (t->kind == cdk_id);
6907 if (flexible_array_member
6908 && !in_system_header_at (input_location))
6909 pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not "
6910 "support flexible array members");
6912 /* ISO C99 Flexible array members are effectively
6913 identical to GCC's zero-length array extension. */
6914 if (flexible_array_member || array_parm_vla_unspec_p)
6915 itype = build_range_type (sizetype, size_zero_node,
6918 else if (decl_context == PARM)
6920 if (array_parm_vla_unspec_p)
6922 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
6926 else if (decl_context == TYPENAME)
6928 if (array_parm_vla_unspec_p)
6931 warning (0, "%<[*]%> not in a declaration");
6932 /* We use this to avoid messing up with incomplete
6933 array types of the same type, that would
6934 otherwise be modified below. */
6935 itype = build_range_type (sizetype, size_zero_node,
6941 /* Complain about arrays of incomplete types. */
6942 if (!COMPLETE_TYPE_P (type))
6944 auto_diagnostic_group d;
6945 error_at (loc, "array type has incomplete element type %qT",
6947 /* See if we can be more helpful. */
6948 if (TREE_CODE (type) == ARRAY_TYPE)
6951 inform (loc, "declaration of %qE as multidimensional "
6952 "array must have bounds for all dimensions "
6953 "except the first", name);
6955 inform (loc, "declaration of multidimensional array "
6956 "must have bounds for all dimensions except "
6959 type = error_mark_node;
6962 /* When itype is NULL, a shared incomplete array type is
6963 returned for all array of a given type. Elsewhere we
6964 make sure we don't complete that type before copying
6965 it, but here we want to make sure we don't ever
6966 modify the shared type, so we gcc_assert (itype)
6969 addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals);
6970 if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type))
6971 type = build_qualified_type (type,
6972 ENCODE_QUAL_ADDR_SPACE (as));
6974 type = build_array_type (type, itype);
6977 if (type != error_mark_node)
6981 /* It is ok to modify type here even if itype is
6982 NULL: if size_varies, we're in a
6983 multi-dimensional array and the inner type has
6984 variable size, so the enclosing shared array type
6986 if (size && TREE_CODE (size) == INTEGER_CST)
6988 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
6989 C_TYPE_VARIABLE_SIZE (type) = 1;
6992 /* The GCC extension for zero-length arrays differs from
6993 ISO flexible array members in that sizeof yields
6995 if (size && integer_zerop (size))
6998 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
6999 TYPE_SIZE (type) = bitsize_zero_node;
7000 TYPE_SIZE_UNIT (type) = size_zero_node;
7001 SET_TYPE_STRUCTURAL_EQUALITY (type);
7003 if (array_parm_vla_unspec_p)
7006 /* The type is complete. C99 6.7.5.2p4 */
7007 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
7008 TYPE_SIZE (type) = bitsize_zero_node;
7009 TYPE_SIZE_UNIT (type) = size_zero_node;
7010 SET_TYPE_STRUCTURAL_EQUALITY (type);
7013 if (!valid_array_size_p (loc, type, name))
7014 type = error_mark_node;
7017 if (decl_context != PARM
7018 && (array_ptr_quals != TYPE_UNQUALIFIED
7019 || array_ptr_attrs != NULL_TREE
7020 || array_parm_static))
7022 error_at (loc, "static or type qualifiers in non-parameter "
7023 "array declarator");
7024 array_ptr_quals = TYPE_UNQUALIFIED;
7025 array_ptr_attrs = NULL_TREE;
7026 array_parm_static = false;
7028 orig_qual_indirect++;
7033 /* Say it's a definition only for the declarator closest
7034 to the identifier, apart possibly from some
7036 bool really_funcdef = false;
7038 orig_qual_type = NULL_TREE;
7041 const struct c_declarator *t = declarator->declarator;
7042 while (t->kind == cdk_attrs)
7044 really_funcdef = (t->kind == cdk_id);
7047 /* Declaring a function type. Make sure we have a valid
7048 type for the function to return. */
7049 if (type == error_mark_node)
7052 size_varies = false;
7054 /* Warn about some types functions can't return. */
7055 if (TREE_CODE (type) == FUNCTION_TYPE)
7058 error_at (loc, "%qE declared as function returning a "
7061 error_at (loc, "type name declared as function "
7062 "returning a function");
7063 type = integer_type_node;
7065 if (TREE_CODE (type) == ARRAY_TYPE)
7068 error_at (loc, "%qE declared as function returning an array",
7071 error_at (loc, "type name declared as function returning "
7073 type = integer_type_node;
7076 /* Construct the function type and go to the next
7077 inner layer of declarator. */
7078 arg_info = declarator->u.arg_info;
7079 arg_types = grokparms (arg_info, really_funcdef);
7081 /* Type qualifiers before the return type of the function
7082 qualify the return type, not the function type. */
7085 const enum c_declspec_word ignored_quals_list[] =
7087 cdw_const, cdw_volatile, cdw_restrict, cdw_address_space,
7088 cdw_atomic, cdw_number_of_elements
7090 location_t specs_loc
7091 = smallest_type_quals_location (declspecs->locations,
7092 ignored_quals_list);
7093 if (specs_loc == UNKNOWN_LOCATION)
7094 specs_loc = declspecs->locations[cdw_typedef];
7095 if (specs_loc == UNKNOWN_LOCATION)
7098 /* Type qualifiers on a function return type are
7099 normally permitted by the standard but have no
7100 effect, so give a warning at -Wreturn-type.
7101 Qualifiers on a void return type are banned on
7102 function definitions in ISO C; GCC used to used
7103 them for noreturn functions. The resolution of C11
7104 DR#423 means qualifiers (other than _Atomic) are
7105 actually removed from the return type when
7106 determining the function type. */
7107 int quals_used = type_quals;
7109 quals_used &= TYPE_QUAL_ATOMIC;
7110 if (quals_used && VOID_TYPE_P (type) && really_funcdef)
7111 pedwarn (specs_loc, 0,
7112 "function definition has qualified void "
7115 warning_at (specs_loc, OPT_Wignored_qualifiers,
7116 "type qualifiers ignored on function "
7119 /* Ensure an error for restrict on invalid types; the
7120 DR#423 resolution is not entirely clear about
7123 && (type_quals & TYPE_QUAL_RESTRICT)
7124 && (!POINTER_TYPE_P (type)
7125 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))))
7126 error_at (loc, "invalid use of %<restrict%>");
7127 type = c_build_qualified_type (type, quals_used);
7129 type_quals = TYPE_UNQUALIFIED;
7131 type = build_function_type (type, arg_types);
7132 declarator = declarator->declarator;
7134 /* Set the TYPE_CONTEXTs for each tagged type which is local to
7135 the formal parameter list of this FUNCTION_TYPE to point to
7136 the FUNCTION_TYPE node itself. */
7141 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
7142 TYPE_CONTEXT (tag->type) = type;
7148 /* Merge any constancy or volatility into the target type
7150 if ((type_quals & TYPE_QUAL_ATOMIC)
7151 && TREE_CODE (type) == FUNCTION_TYPE)
7154 "%<_Atomic%>-qualified function type");
7155 type_quals &= ~TYPE_QUAL_ATOMIC;
7157 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
7159 pedwarn (loc, OPT_Wpedantic,
7160 "ISO C forbids qualified function types");
7162 type = c_build_qualified_type (type, type_quals, orig_qual_type,
7163 orig_qual_indirect);
7164 orig_qual_type = NULL_TREE;
7165 size_varies = false;
7167 /* When the pointed-to type involves components of variable size,
7168 care must be taken to ensure that the size evaluation code is
7169 emitted early enough to dominate all the possible later uses
7170 and late enough for the variables on which it depends to have
7173 This is expected to happen automatically when the pointed-to
7174 type has a name/declaration of it's own, but special attention
7175 is required if the type is anonymous.
7177 We attach an artificial TYPE_DECL to such pointed-to type
7178 and arrange for it to be included in a DECL_EXPR. This
7179 forces the sizes evaluation at a safe point and ensures it
7180 is not deferred until e.g. within a deeper conditional context.
7182 PARM contexts have no enclosing statement list that
7183 can hold the DECL_EXPR, so we need to use a BIND_EXPR
7184 instead, and add it to the list of expressions that
7185 need to be evaluated.
7187 TYPENAME contexts do have an enclosing statement list,
7188 but it would be incorrect to use it, as the size should
7189 only be evaluated if the containing expression is
7190 evaluated. We might also be in the middle of an
7191 expression with side effects on the pointed-to type size
7192 "arguments" prior to the pointer declaration point and
7193 the fake TYPE_DECL in the enclosing context would force
7194 the size evaluation prior to the side effects. We therefore
7195 use BIND_EXPRs in TYPENAME contexts too. */
7196 if (!TYPE_NAME (type)
7197 && variably_modified_type_p (type, NULL_TREE))
7199 tree bind = NULL_TREE;
7200 if (decl_context == TYPENAME || decl_context == PARM)
7202 bind = build3 (BIND_EXPR, void_type_node, NULL_TREE,
7203 NULL_TREE, NULL_TREE);
7204 TREE_SIDE_EFFECTS (bind) = 1;
7205 BIND_EXPR_BODY (bind) = push_stmt_list ();
7208 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
7209 DECL_ARTIFICIAL (decl) = 1;
7211 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
7212 TYPE_NAME (type) = decl;
7216 BIND_EXPR_BODY (bind)
7217 = pop_stmt_list (BIND_EXPR_BODY (bind));
7219 *expr = build2 (COMPOUND_EXPR, void_type_node, *expr,
7226 type = c_build_pointer_type (type);
7228 /* Process type qualifiers (such as const or volatile)
7229 that were given inside the `*'. */
7230 type_quals = declarator->u.pointer_quals;
7232 declarator = declarator->declarator;
7239 *decl_attrs = chainon (returned_attrs, *decl_attrs);
7240 *decl_attrs = chainon (decl_id_attrs, *decl_attrs);
7242 /* Now TYPE has the actual type, apart from any qualifiers in
7245 /* Warn about address space used for things other than static memory or
7247 address_space = DECODE_QUAL_ADDR_SPACE (type_quals);
7248 if (!ADDR_SPACE_GENERIC_P (address_space))
7250 if (decl_context == NORMAL)
7252 switch (storage_class)
7255 error ("%qs combined with %<auto%> qualifier for %qE",
7256 c_addr_space_name (address_space), name);
7259 error ("%qs combined with %<register%> qualifier for %qE",
7260 c_addr_space_name (address_space), name);
7263 if (current_function_scope)
7265 error ("%qs specified for auto variable %qE",
7266 c_addr_space_name (address_space), name);
7278 else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE)
7281 error ("%qs specified for parameter %qE",
7282 c_addr_space_name (address_space), name);
7284 error ("%qs specified for unnamed parameter",
7285 c_addr_space_name (address_space));
7287 else if (decl_context == FIELD)
7290 error ("%qs specified for structure field %qE",
7291 c_addr_space_name (address_space), name);
7293 error ("%qs specified for structure field",
7294 c_addr_space_name (address_space));
7298 /* Check the type and width of a bit-field. */
7301 check_bitfield_type_and_width (loc, &type, width, name);
7302 /* C11 makes it implementation-defined (6.7.2.1#5) whether
7303 atomic types are permitted for bit-fields; we have no code to
7304 make bit-field accesses atomic, so disallow them. */
7305 if (type_quals & TYPE_QUAL_ATOMIC)
7308 error_at (loc, "bit-field %qE has atomic type", name);
7310 error_at (loc, "bit-field has atomic type");
7311 type_quals &= ~TYPE_QUAL_ATOMIC;
7315 /* Reject invalid uses of _Alignas. */
7316 if (declspecs->alignas_p)
7318 if (storage_class == csc_typedef)
7319 error_at (loc, "alignment specified for typedef %qE", name);
7320 else if (storage_class == csc_register)
7321 error_at (loc, "alignment specified for %<register%> object %qE",
7323 else if (decl_context == PARM)
7326 error_at (loc, "alignment specified for parameter %qE", name);
7328 error_at (loc, "alignment specified for unnamed parameter");
7333 error_at (loc, "alignment specified for bit-field %qE", name);
7335 error_at (loc, "alignment specified for unnamed bit-field");
7337 else if (TREE_CODE (type) == FUNCTION_TYPE)
7338 error_at (loc, "alignment specified for function %qE", name);
7339 else if (declspecs->align_log != -1 && TYPE_P (type))
7341 alignas_align = 1U << declspecs->align_log;
7342 if (alignas_align < min_align_of_type (type))
7345 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
7346 "alignment of %qE", name);
7348 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
7349 "alignment of unnamed field");
7355 /* If this is declaring a typedef name, return a TYPE_DECL. */
7357 if (storage_class == csc_typedef)
7360 if ((type_quals & TYPE_QUAL_ATOMIC)
7361 && TREE_CODE (type) == FUNCTION_TYPE)
7364 "%<_Atomic%>-qualified function type");
7365 type_quals &= ~TYPE_QUAL_ATOMIC;
7367 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
7369 pedwarn (loc, OPT_Wpedantic,
7370 "ISO C forbids qualified function types");
7372 type = c_build_qualified_type (type, type_quals, orig_qual_type,
7373 orig_qual_indirect);
7374 decl = build_decl (declarator->id_loc,
7375 TYPE_DECL, declarator->u.id.id, type);
7376 if (declspecs->explicit_signed_p)
7377 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
7378 if (declspecs->inline_p)
7379 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
7380 if (declspecs->noreturn_p)
7381 pedwarn (loc, 0,"typedef %q+D declared %<_Noreturn%>", decl);
7383 if (warn_cxx_compat && declarator->u.id.id != NULL_TREE)
7385 struct c_binding *b = I_TAG_BINDING (declarator->u.id.id);
7388 && b->decl != NULL_TREE
7389 && (B_IN_CURRENT_SCOPE (b)
7390 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
7391 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
7393 auto_diagnostic_group d;
7394 if (warning_at (declarator->id_loc, OPT_Wc___compat,
7395 ("using %qD as both a typedef and a tag is "
7396 "invalid in C++"), decl)
7397 && b->locus != UNKNOWN_LOCATION)
7398 inform (b->locus, "originally defined here");
7405 /* If this is a type name (such as, in a cast or sizeof),
7406 compute the type and return it now. */
7408 if (decl_context == TYPENAME)
7410 /* Note that the grammar rejects storage classes in typenames
7412 gcc_assert (storage_class == csc_none && !threadp
7413 && !declspecs->inline_p && !declspecs->noreturn_p);
7414 if ((type_quals & TYPE_QUAL_ATOMIC)
7415 && TREE_CODE (type) == FUNCTION_TYPE)
7418 "%<_Atomic%>-qualified function type");
7419 type_quals &= ~TYPE_QUAL_ATOMIC;
7421 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
7423 pedwarn (loc, OPT_Wpedantic,
7424 "ISO C forbids const or volatile function types");
7426 type = c_build_qualified_type (type, type_quals, orig_qual_type,
7427 orig_qual_indirect);
7431 if (pedantic && decl_context == FIELD
7432 && variably_modified_type_p (type, NULL_TREE))
7435 pedwarn (loc, OPT_Wpedantic, "a member of a structure or union cannot "
7436 "have a variably modified type");
7439 /* Aside from typedefs and type names (handle above),
7440 `void' at top level (not within pointer)
7441 is allowed only in public variables.
7442 We don't complain about parms either, but that is because
7443 a better error message can be made later. */
7445 if (VOID_TYPE_P (type) && decl_context != PARM
7446 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
7447 && (storage_class == csc_extern
7448 || (current_scope == file_scope
7449 && !(storage_class == csc_static
7450 || storage_class == csc_register)))))
7452 error_at (loc, "variable or field %qE declared void", name);
7453 type = integer_type_node;
7456 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
7457 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
7462 if (decl_context == PARM)
7465 bool array_parameter_p = false;
7467 /* A parameter declared as an array of T is really a pointer to T.
7468 One declared as a function is really a pointer to a function. */
7470 if (TREE_CODE (type) == ARRAY_TYPE)
7472 /* Transfer const-ness of array into that of type pointed to. */
7473 type = TREE_TYPE (type);
7474 if (orig_qual_type != NULL_TREE)
7476 if (orig_qual_indirect == 0)
7477 orig_qual_type = TREE_TYPE (orig_qual_type);
7479 orig_qual_indirect--;
7482 type = c_build_qualified_type (type, type_quals, orig_qual_type,
7483 orig_qual_indirect);
7484 type = c_build_pointer_type (type);
7485 type_quals = array_ptr_quals;
7487 type = c_build_qualified_type (type, type_quals);
7489 /* We don't yet implement attributes in this context. */
7490 if (array_ptr_attrs != NULL_TREE)
7491 warning_at (loc, OPT_Wattributes,
7492 "attributes in parameter array declarator ignored");
7494 size_varies = false;
7495 array_parameter_p = true;
7497 else if (TREE_CODE (type) == FUNCTION_TYPE)
7499 if (type_quals & TYPE_QUAL_ATOMIC)
7502 "%<_Atomic%>-qualified function type");
7503 type_quals &= ~TYPE_QUAL_ATOMIC;
7505 else if (type_quals)
7506 pedwarn (loc, OPT_Wpedantic,
7507 "ISO C forbids qualified function types");
7509 type = c_build_qualified_type (type, type_quals);
7510 type = c_build_pointer_type (type);
7511 type_quals = TYPE_UNQUALIFIED;
7513 else if (type_quals)
7514 type = c_build_qualified_type (type, type_quals);
7516 decl = build_decl (declarator->id_loc,
7517 PARM_DECL, declarator->u.id.id, type);
7519 C_DECL_VARIABLE_SIZE (decl) = 1;
7520 C_ARRAY_PARAMETER (decl) = array_parameter_p;
7522 /* Compute the type actually passed in the parmlist,
7523 for the case where there is no prototype.
7524 (For example, shorts and chars are passed as ints.)
7525 When there is a prototype, this is overridden later. */
7527 if (type == error_mark_node)
7528 promoted_type = type;
7530 promoted_type = c_type_promotes_to (type);
7532 DECL_ARG_TYPE (decl) = promoted_type;
7533 if (declspecs->inline_p)
7534 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
7535 if (declspecs->noreturn_p)
7536 pedwarn (loc, 0, "parameter %q+D declared %<_Noreturn%>", decl);
7538 else if (decl_context == FIELD)
7540 /* Note that the grammar rejects storage classes in typenames
7542 gcc_assert (storage_class == csc_none && !threadp
7543 && !declspecs->inline_p && !declspecs->noreturn_p);
7545 /* Structure field. It may not be a function. */
7547 if (TREE_CODE (type) == FUNCTION_TYPE)
7549 error_at (loc, "field %qE declared as a function", name);
7550 type = build_pointer_type (type);
7552 else if (TREE_CODE (type) != ERROR_MARK
7553 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
7556 error_at (loc, "field %qE has incomplete type", name);
7558 error_at (loc, "unnamed field has incomplete type");
7559 type = error_mark_node;
7561 else if (TREE_CODE (type) == ARRAY_TYPE
7562 && TYPE_DOMAIN (type) == NULL_TREE)
7564 /* We have a flexible array member through a typedef.
7565 Set suitable range. Whether this is a correct position
7566 for a flexible array member will be determined elsewhere. */
7567 if (!in_system_header_at (input_location))
7568 pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not "
7569 "support flexible array members");
7570 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
7571 TYPE_DOMAIN (type) = build_range_type (sizetype, size_zero_node,
7573 if (orig_qual_indirect == 0)
7574 orig_qual_type = NULL_TREE;
7576 if (type != error_mark_node
7577 && !verify_type_context (loc, TCTX_FIELD, type))
7578 type = error_mark_node;
7580 type = c_build_qualified_type (type, type_quals, orig_qual_type,
7581 orig_qual_indirect);
7582 decl = build_decl (declarator->id_loc,
7583 FIELD_DECL, declarator->u.id.id, type);
7584 DECL_NONADDRESSABLE_P (decl) = bitfield;
7585 if (bitfield && !declarator->u.id.id)
7586 DECL_PADDING_P (decl) = 1;
7589 C_DECL_VARIABLE_SIZE (decl) = 1;
7591 else if (TREE_CODE (type) == FUNCTION_TYPE)
7593 if (storage_class == csc_register || threadp)
7595 error_at (loc, "invalid storage class for function %qE", name);
7597 else if (current_scope != file_scope)
7599 /* Function declaration not at file scope. Storage
7600 classes other than `extern' are not allowed, C99
7601 6.7.1p5, and `extern' makes no difference. However,
7602 GCC allows 'auto', perhaps with 'inline', to support
7603 nested functions. */
7604 if (storage_class == csc_auto)
7605 pedwarn (loc, OPT_Wpedantic,
7606 "invalid storage class for function %qE", name);
7607 else if (storage_class == csc_static)
7609 error_at (loc, "invalid storage class for function %qE", name);
7611 storage_class = declspecs->storage_class = csc_none;
7617 decl = build_decl (declarator->id_loc,
7618 FUNCTION_DECL, declarator->u.id.id, type);
7619 decl = build_decl_attribute_variant (decl, decl_attr);
7621 if (type_quals & TYPE_QUAL_ATOMIC)
7624 "%<_Atomic%>-qualified function type");
7625 type_quals &= ~TYPE_QUAL_ATOMIC;
7627 else if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
7628 pedwarn (loc, OPT_Wpedantic,
7629 "ISO C forbids qualified function types");
7631 /* Every function declaration is an external reference
7632 (DECL_EXTERNAL) except for those which are not at file
7633 scope and are explicitly declared "auto". This is
7634 forbidden by standard C (C99 6.7.1p5) and is interpreted by
7635 GCC to signify a forward declaration of a nested function. */
7636 if (storage_class == csc_auto && current_scope != file_scope)
7637 DECL_EXTERNAL (decl) = 0;
7638 /* In C99, a function which is declared 'inline' with 'extern'
7639 is not an external reference (which is confusing). It
7640 means that the later definition of the function must be output
7641 in this file, C99 6.7.4p6. In GNU C89, a function declared
7642 'extern inline' is an external reference. */
7643 else if (declspecs->inline_p && storage_class != csc_static)
7644 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
7645 == flag_gnu89_inline);
7647 DECL_EXTERNAL (decl) = !initialized;
7649 /* Record absence of global scope for `static' or `auto'. */
7651 = !(storage_class == csc_static || storage_class == csc_auto);
7653 /* For a function definition, record the argument information
7654 block where store_parm_decls will look for it. */
7656 current_function_arg_info = arg_info;
7658 if (declspecs->default_int_p)
7659 C_FUNCTION_IMPLICIT_INT (decl) = 1;
7661 /* Record presence of `inline' and `_Noreturn', if it is
7663 if (flag_hosted && MAIN_NAME_P (declarator->u.id.id))
7665 if (declspecs->inline_p)
7666 pedwarn (loc, 0, "cannot inline function %<main%>");
7667 if (declspecs->noreturn_p)
7668 pedwarn (loc, 0, "%<main%> declared %<_Noreturn%>");
7672 if (declspecs->inline_p)
7673 /* Record that the function is declared `inline'. */
7674 DECL_DECLARED_INLINE_P (decl) = 1;
7675 if (declspecs->noreturn_p)
7678 pedwarn_c99 (loc, OPT_Wpedantic,
7679 "ISO C99 does not support %<_Noreturn%>");
7681 pedwarn_c99 (loc, OPT_Wpedantic,
7682 "ISO C90 does not support %<_Noreturn%>");
7683 TREE_THIS_VOLATILE (decl) = 1;
7689 /* It's a variable. */
7690 /* An uninitialized decl with `extern' is a reference. */
7691 int extern_ref = !initialized && storage_class == csc_extern;
7693 type = c_build_qualified_type (type, type_quals, orig_qual_type,
7694 orig_qual_indirect);
7696 /* C99 6.2.2p7: It is invalid (compile-time undefined
7697 behavior) to create an 'extern' declaration for a
7698 variable if there is a global declaration that is
7699 'static' and the global declaration is not visible.
7700 (If the static declaration _is_ currently visible,
7701 the 'extern' declaration is taken to refer to that decl.) */
7702 if (extern_ref && current_scope != file_scope)
7704 tree global_decl = identifier_global_value (declarator->u.id.id);
7705 tree visible_decl = lookup_name (declarator->u.id.id);
7708 && global_decl != visible_decl
7709 && VAR_P (global_decl)
7710 && !TREE_PUBLIC (global_decl))
7711 error_at (loc, "variable previously declared %<static%> "
7712 "redeclared %<extern%>");
7715 decl = build_decl (declarator->id_loc,
7716 VAR_DECL, declarator->u.id.id, type);
7718 C_DECL_VARIABLE_SIZE (decl) = 1;
7720 if (declspecs->inline_p)
7721 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
7722 if (declspecs->noreturn_p)
7723 pedwarn (loc, 0, "variable %q+D declared %<_Noreturn%>", decl);
7725 /* At file scope, an initialized extern declaration may follow
7726 a static declaration. In that case, DECL_EXTERNAL will be
7727 reset later in start_decl. */
7728 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
7730 /* At file scope, the presence of a `static' or `register' storage
7731 class specifier, or the absence of all storage class specifiers
7732 makes this declaration a definition (perhaps tentative). Also,
7733 the absence of `static' makes it public. */
7734 if (current_scope == file_scope)
7736 TREE_PUBLIC (decl) = storage_class != csc_static;
7737 TREE_STATIC (decl) = !extern_ref;
7739 /* Not at file scope, only `static' makes a static definition. */
7742 TREE_STATIC (decl) = (storage_class == csc_static);
7743 TREE_PUBLIC (decl) = extern_ref;
7747 set_decl_tls_model (decl, decl_default_tls_model (decl));
7750 if ((storage_class == csc_extern
7751 || (storage_class == csc_none
7752 && TREE_CODE (type) == FUNCTION_TYPE
7754 && variably_modified_type_p (type, NULL_TREE))
7757 if (TREE_CODE (type) == FUNCTION_TYPE)
7758 error_at (loc, "non-nested function with variably modified type");
7760 error_at (loc, "object with variably modified type must have "
7764 /* For nested functions disqualify ones taking VLAs by value
7765 from inlining since the middle-end cannot deal with this.
7766 ??? We should arrange for those to be passed by reference
7767 with emitting the copy on the caller side in the frontend. */
7768 if (storage_class == csc_none
7769 && TREE_CODE (type) == FUNCTION_TYPE)
7770 for (tree al = TYPE_ARG_TYPES (type); al; al = TREE_CHAIN (al))
7772 tree arg = TREE_VALUE (al);
7773 if (arg != error_mark_node
7774 && C_TYPE_VARIABLE_SIZE (arg))
7776 DECL_UNINLINABLE (decl) = 1;
7781 /* Record `register' declaration for warnings on &
7782 and in case doing stupid register allocation. */
7784 if (storage_class == csc_register)
7786 C_DECL_REGISTER (decl) = 1;
7787 DECL_REGISTER (decl) = 1;
7790 /* Record constancy and volatility. */
7791 c_apply_type_quals_to_decl (type_quals, decl);
7793 /* Apply _Alignas specifiers. */
7796 SET_DECL_ALIGN (decl, alignas_align * BITS_PER_UNIT);
7797 DECL_USER_ALIGN (decl) = 1;
7800 /* If a type has volatile components, it should be stored in memory.
7801 Otherwise, the fact that those components are volatile
7802 will be ignored, and would even crash the compiler.
7803 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
7804 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
7805 && (VAR_P (decl) || TREE_CODE (decl) == PARM_DECL
7806 || TREE_CODE (decl) == RESULT_DECL))
7808 /* It is not an error for a structure with volatile fields to
7809 be declared register, but reset DECL_REGISTER since it
7810 cannot actually go in a register. */
7811 int was_reg = C_DECL_REGISTER (decl);
7812 C_DECL_REGISTER (decl) = 0;
7813 DECL_REGISTER (decl) = 0;
7814 c_mark_addressable (decl);
7815 C_DECL_REGISTER (decl) = was_reg;
7818 /* This is the earliest point at which we might know the assembler
7819 name of a variable. Thus, if it's known before this, die horribly. */
7820 gcc_assert (!HAS_DECL_ASSEMBLER_NAME_P (decl)
7821 || !DECL_ASSEMBLER_NAME_SET_P (decl));
7825 && TREE_PUBLIC (decl)
7826 && TREE_STATIC (decl)
7827 && (RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl))
7828 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
7829 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
7830 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
7831 ("non-local variable %qD with anonymous type is "
7832 "questionable in C++"),
7839 /* Decode the parameter-list info for a function type or function definition.
7840 The argument is the value returned by `get_parm_info' (or made in c-parse.c
7841 if there is an identifier list instead of a parameter decl list).
7842 These two functions are separate because when a function returns
7843 or receives functions then each is called multiple times but the order
7844 of calls is different. The last call to `grokparms' is always the one
7845 that contains the formal parameter names of a function definition.
7847 Return a list of arg types to use in the FUNCTION_TYPE for this function.
7849 FUNCDEF_FLAG is true for a function definition, false for
7850 a mere declaration. A nonempty identifier-list gets an error message
7851 when FUNCDEF_FLAG is false. */
7854 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
7856 tree arg_types = arg_info->types;
7858 if (funcdef_flag && arg_info->had_vla_unspec)
7860 /* A function definition isn't function prototype scope C99 6.2.1p4. */
7862 error ("%<[*]%> not allowed in other than function prototype scope");
7865 if (arg_types == NULL_TREE && !funcdef_flag
7866 && !in_system_header_at (input_location))
7867 warning (OPT_Wstrict_prototypes,
7868 "function declaration isn%'t a prototype");
7870 if (arg_types == error_mark_node)
7871 /* Don't set TYPE_ARG_TYPES in this case. */
7874 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
7878 pedwarn (input_location, 0, "parameter names (without types) in "
7879 "function declaration");
7880 arg_info->parms = NULL_TREE;
7883 arg_info->parms = arg_info->types;
7885 arg_info->types = NULL_TREE;
7890 tree parm, type, typelt;
7891 unsigned int parmno;
7893 /* In C2X, convert () in a function definition to (void). */
7897 && !arg_info->parms)
7898 arg_types = arg_info->types = void_list_node;
7900 /* If there is a parameter of incomplete type in a definition,
7901 this is an error. In a declaration this is valid, and a
7902 struct or union type may be completed later, before any calls
7903 or definition of the function. In the case where the tag was
7904 first declared within the parameter list, a warning has
7905 already been given. If a parameter has void type, then
7906 however the function cannot be defined or called, so
7909 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
7911 parm = DECL_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
7913 type = TREE_VALUE (typelt);
7914 if (type == error_mark_node)
7917 if (!COMPLETE_TYPE_P (type))
7921 if (DECL_NAME (parm))
7922 error_at (input_location,
7923 "parameter %u (%q+D) has incomplete type",
7926 error_at (DECL_SOURCE_LOCATION (parm),
7927 "parameter %u has incomplete type",
7930 TREE_VALUE (typelt) = error_mark_node;
7931 TREE_TYPE (parm) = error_mark_node;
7932 arg_types = NULL_TREE;
7934 else if (VOID_TYPE_P (type))
7936 if (DECL_NAME (parm))
7937 warning_at (input_location, 0,
7938 "parameter %u (%q+D) has void type",
7941 warning_at (DECL_SOURCE_LOCATION (parm), 0,
7942 "parameter %u has void type",
7947 if (DECL_NAME (parm) && TREE_USED (parm))
7948 warn_if_shadowing (parm);
7954 /* Allocate and initialize a c_arg_info structure from the parser's
7958 build_arg_info (void)
7960 struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info);
7961 ret->parms = NULL_TREE;
7963 ret->types = NULL_TREE;
7964 ret->others = NULL_TREE;
7965 ret->pending_sizes = NULL;
7966 ret->had_vla_unspec = 0;
7970 /* Take apart the current scope and return a c_arg_info structure with
7971 info on a parameter list just parsed.
7973 This structure is later fed to 'grokparms' and 'store_parm_decls'.
7975 ELLIPSIS being true means the argument list ended in '...' so don't
7976 append a sentinel (void_list_node) to the end of the type-list.
7978 EXPR is NULL or an expression that needs to be evaluated for the
7979 side effects of array size expressions in the parameters. */
7982 get_parm_info (bool ellipsis, tree expr)
7984 struct c_binding *b = current_scope->bindings;
7985 struct c_arg_info *arg_info = build_arg_info ();
7987 tree parms = NULL_TREE;
7988 vec<c_arg_tag, va_gc> *tags = NULL;
7989 tree types = NULL_TREE;
7990 tree others = NULL_TREE;
7992 bool gave_void_only_once_err = false;
7994 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
7996 /* The bindings in this scope must not get put into a block.
7997 We will take care of deleting the binding nodes. */
7998 current_scope->bindings = 0;
8000 /* This function is only called if there was *something* on the
8004 /* A parameter list consisting solely of 'void' indicates that the
8005 function takes no arguments. But if the 'void' is qualified
8006 (by 'const' or 'volatile'), or has a storage class specifier
8007 ('register'), then the behavior is undefined; issue an error.
8008 Typedefs for 'void' are OK (see DR#157). */
8009 if (b->prev == 0 /* one binding */
8010 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
8011 && !DECL_NAME (b->decl) /* anonymous */
8012 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
8014 if (TYPE_QUALS (TREE_TYPE (b->decl)) != TYPE_UNQUALIFIED
8015 || C_DECL_REGISTER (b->decl))
8016 error_at (b->locus, "%<void%> as only parameter may not be qualified");
8018 /* There cannot be an ellipsis. */
8020 error_at (b->locus, "%<void%> must be the only parameter");
8022 arg_info->types = void_list_node;
8027 types = void_list_node;
8029 /* Break up the bindings list into parms, tags, types, and others;
8030 apply sanity checks; purge the name-to-decl bindings. */
8033 tree decl = b->decl;
8034 tree type = TREE_TYPE (decl);
8036 const char *keyword;
8038 switch (TREE_CODE (decl))
8043 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
8044 I_SYMBOL_BINDING (b->id) = b->shadowed;
8047 /* Check for forward decls that never got their actual decl. */
8048 if (TREE_ASM_WRITTEN (decl))
8050 "parameter %q+D has just a forward declaration", decl);
8051 /* Check for (..., void, ...) and issue an error. */
8052 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
8054 if (!gave_void_only_once_err)
8056 error_at (b->locus, "%<void%> must be the only parameter");
8057 gave_void_only_once_err = true;
8062 /* Valid parameter, add it to the list. */
8063 DECL_CHAIN (decl) = parms;
8066 /* Since there is a prototype, args are passed in their
8067 declared types. The back end may override this later. */
8068 DECL_ARG_TYPE (decl) = type;
8069 types = tree_cons (0, type, types);
8073 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
8074 case UNION_TYPE: keyword = "union"; goto tag;
8075 case RECORD_TYPE: keyword = "struct"; goto tag;
8077 /* Types may not have tag-names, in which case the type
8078 appears in the bindings list with b->id NULL. */
8081 gcc_assert (I_TAG_BINDING (b->id) == b);
8082 I_TAG_BINDING (b->id) = b->shadowed;
8085 /* Warn about any struct, union or enum tags defined in a
8086 parameter list. The scope of such types is limited to
8087 the parameter list, which is rarely if ever desirable
8088 (it's impossible to call such a function with type-
8089 correct arguments). An anonymous union parm type is
8090 meaningful as a GNU extension, so don't warn for that. */
8091 if (TREE_CODE (decl) != UNION_TYPE || b->id != NULL_TREE)
8094 /* The %s will be one of 'struct', 'union', or 'enum'. */
8095 warning_at (b->locus, 0,
8096 "%<%s %E%> declared inside parameter list"
8097 " will not be visible outside of this definition or"
8098 " declaration", keyword, b->id);
8100 /* The %s will be one of 'struct', 'union', or 'enum'. */
8101 warning_at (b->locus, 0,
8102 "anonymous %s declared inside parameter list"
8103 " will not be visible outside of this definition or"
8104 " declaration", keyword);
8109 vec_safe_push (tags, tag);
8113 /* FUNCTION_DECLs appear when there is an implicit function
8114 declaration in the parameter list. */
8115 gcc_assert (b->nested || seen_error ());
8120 /* CONST_DECLs appear here when we have an embedded enum,
8121 and TYPE_DECLs appear here when we have an embedded struct
8122 or union. No warnings for this - we already warned about the
8125 /* When we reinsert this decl in the function body, we need
8126 to reconstruct whether it was marked as nested. */
8127 gcc_assert (!b->nested);
8128 DECL_CHAIN (decl) = others;
8134 /* error_mark_node appears here when we have an undeclared
8135 variable. Just throw it away. */
8138 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
8139 I_SYMBOL_BINDING (b->id) = b->shadowed;
8143 /* Other things that might be encountered. */
8150 b = free_binding_and_advance (b);
8153 arg_info->parms = parms;
8154 arg_info->tags = tags;
8155 arg_info->types = types;
8156 arg_info->others = others;
8157 arg_info->pending_sizes = expr;
8161 /* Get the struct, enum or union (CODE says which) with tag NAME.
8162 Define the tag as a forward-reference with location LOC if it is
8163 not defined. HAVE_STD_ATTRS says whether any standard attributes
8164 were present after the struct, union or enum keyword; ATTRS are the
8165 standard attributes present there. Return a c_typespec structure
8166 for the type specifier. */
8169 parser_xref_tag (location_t loc, enum tree_code code, tree name,
8170 bool have_std_attrs, tree attrs)
8172 struct c_typespec ret;
8176 ret.expr = NULL_TREE;
8177 ret.expr_const_operands = true;
8179 /* If a cross reference is requested, look up the type
8180 already defined for this tag and return it. */
8182 ref = lookup_tag (code, name, false, &refloc);
8183 /* If this is the right type of tag, return what we found.
8184 (This reference will be shadowed by shadow_tag later if appropriate.)
8185 If this is the wrong type of tag, do not return it. If it was the
8186 wrong type in the same scope, we will have had an error
8187 message already; if in a different scope and declaring
8188 a name, pending_xref_error will give an error message; but if in a
8189 different scope and not declaring a name, this tag should
8190 shadow the previous declaration of a different type of tag, and
8191 this would not work properly if we return the reference found.
8192 (For example, with "struct foo" in an outer scope, "union foo;"
8193 must shadow that tag with a new one of union type.) */
8195 ? (have_std_attrs ? ctsk_tagref_attrs : ctsk_tagref)
8196 : (have_std_attrs ? ctsk_tagfirstref_attrs : ctsk_tagfirstref));
8197 if (ref && TREE_CODE (ref) == code)
8199 decl_attributes (&ref, attrs, (int) ATTR_FLAG_TYPE_IN_PLACE);
8200 if (C_TYPE_DEFINED_IN_STRUCT (ref)
8201 && loc != UNKNOWN_LOCATION
8204 auto_diagnostic_group d;
8208 if (warning_at (loc, OPT_Wc___compat,
8209 ("enum type defined in struct or union "
8210 "is not visible in C++")))
8211 inform (refloc, "enum type defined here");
8214 if (warning_at (loc, OPT_Wc___compat,
8215 ("struct defined in struct or union "
8216 "is not visible in C++")))
8217 inform (refloc, "struct defined here");
8220 if (warning_at (loc, OPT_Wc___compat,
8221 ("union defined in struct or union "
8222 "is not visible in C++")))
8223 inform (refloc, "union defined here");
8234 /* If no such tag is yet defined, create a forward-reference node
8235 and record it as the "definition".
8236 When a real declaration of this type is found,
8237 the forward-reference will be altered into a real type. */
8239 ref = make_node (code);
8240 if (code == ENUMERAL_TYPE)
8242 /* Give the type a default layout like unsigned int
8243 to avoid crashing if it does not get defined. */
8244 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
8245 SET_TYPE_ALIGN (ref, TYPE_ALIGN (unsigned_type_node));
8246 TYPE_USER_ALIGN (ref) = 0;
8247 TYPE_UNSIGNED (ref) = 1;
8248 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
8249 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
8250 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
8253 pushtag (loc, name, ref);
8254 decl_attributes (&ref, attrs, (int) ATTR_FLAG_TYPE_IN_PLACE);
8260 /* Get the struct, enum or union (CODE says which) with tag NAME.
8261 Define the tag as a forward-reference if it is not defined.
8262 Return a tree for the type. */
8265 xref_tag (enum tree_code code, tree name)
8267 return parser_xref_tag (input_location, code, name, false, NULL_TREE).spec;
8270 /* Make sure that the tag NAME is defined *in the current scope*
8271 at least as a forward reference.
8272 LOC is the location of the struct's definition.
8273 CODE says which kind of tag NAME ought to be.
8275 This stores the current value of the file static STRUCT_PARSE_INFO
8276 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
8277 new c_struct_parse_info structure. The old value of
8278 STRUCT_PARSE_INFO is restored in finish_struct. */
8281 start_struct (location_t loc, enum tree_code code, tree name,
8282 class c_struct_parse_info **enclosing_struct_parse_info)
8284 /* If there is already a tag defined at this scope
8285 (as a forward reference), just return it. */
8287 tree ref = NULL_TREE;
8288 location_t refloc = UNKNOWN_LOCATION;
8290 if (name != NULL_TREE)
8291 ref = lookup_tag (code, name, true, &refloc);
8292 if (ref && TREE_CODE (ref) == code)
8294 if (TYPE_STUB_DECL (ref))
8295 refloc = DECL_SOURCE_LOCATION (TYPE_STUB_DECL (ref));
8297 if (TYPE_SIZE (ref))
8299 auto_diagnostic_group d;
8300 if (code == UNION_TYPE)
8301 error_at (loc, "redefinition of %<union %E%>", name);
8303 error_at (loc, "redefinition of %<struct %E%>", name);
8304 if (refloc != UNKNOWN_LOCATION)
8305 inform (refloc, "originally defined here");
8306 /* Don't create structures using a name already in use. */
8309 else if (C_TYPE_BEING_DEFINED (ref))
8311 if (code == UNION_TYPE)
8312 error_at (loc, "nested redefinition of %<union %E%>", name);
8314 error_at (loc, "nested redefinition of %<struct %E%>", name);
8315 /* Don't bother to report "originally defined here" for a
8316 nested redefinition; the original definition should be
8318 /* Don't create structures that contain themselves. */
8323 /* Otherwise create a forward-reference just so the tag is in scope. */
8325 if (ref == NULL_TREE || TREE_CODE (ref) != code)
8327 ref = make_node (code);
8328 pushtag (loc, name, ref);
8331 C_TYPE_BEING_DEFINED (ref) = 1;
8332 for (tree v = TYPE_MAIN_VARIANT (ref); v; v = TYPE_NEXT_VARIANT (v))
8333 TYPE_PACKED (v) = flag_pack_struct;
8335 *enclosing_struct_parse_info = struct_parse_info;
8336 struct_parse_info = new c_struct_parse_info ();
8338 /* FIXME: This will issue a warning for a use of a type defined
8339 within a statement expr used within sizeof, et. al. This is not
8340 terribly serious as C++ doesn't permit statement exprs within
8342 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
8343 warning_at (loc, OPT_Wc___compat,
8344 "defining type in %qs expression is invalid in C++",
8347 : (in_typeof ? "typeof" : "alignof")));
8352 /* Process the specs, declarator and width (NULL if omitted)
8353 of a structure component, returning a FIELD_DECL node.
8354 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
8355 DECL_ATTRS is as for grokdeclarator.
8357 LOC is the location of the structure component.
8359 This is done during the parsing of the struct declaration.
8360 The FIELD_DECL nodes are chained together and the lot of them
8361 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
8364 grokfield (location_t loc,
8365 struct c_declarator *declarator, struct c_declspecs *declspecs,
8366 tree width, tree *decl_attrs)
8370 if (declarator->kind == cdk_id && declarator->u.id.id == NULL_TREE
8371 && width == NULL_TREE)
8373 /* This is an unnamed decl.
8375 If we have something of the form "union { list } ;" then this
8376 is the anonymous union extension. Similarly for struct.
8378 If this is something of the form "struct foo;", then
8379 If MS or Plan 9 extensions are enabled, this is handled as
8380 an anonymous struct.
8381 Otherwise this is a forward declaration of a structure tag.
8383 If this is something of the form "foo;" and foo is a TYPE_DECL, then
8384 If foo names a structure or union without a tag, then this
8385 is an anonymous struct (this is permitted by C11).
8386 If MS or Plan 9 extensions are enabled and foo names a
8387 structure, then again this is an anonymous struct.
8388 Otherwise this is an error.
8390 Oh what a horrid tangled web we weave. I wonder if MS consciously
8391 took this from Plan 9 or if it was an accident of implementation
8392 that took root before someone noticed the bug... */
8394 tree type = declspecs->type;
8397 if (RECORD_OR_UNION_TYPE_P (type)
8398 && (flag_ms_extensions
8399 || flag_plan9_extensions
8400 || !declspecs->typedef_p))
8402 if (flag_ms_extensions || flag_plan9_extensions)
8404 else if (TYPE_NAME (type) == NULL)
8411 pedwarn (loc, 0, "declaration does not declare anything");
8415 pedwarn_c99 (loc, OPT_Wpedantic,
8416 "ISO C99 doesn%'t support unnamed structs/unions");
8418 pedwarn_c99 (loc, OPT_Wpedantic,
8419 "ISO C90 doesn%'t support unnamed structs/unions");
8422 value = grokdeclarator (declarator, declspecs, FIELD, false,
8423 width ? &width : NULL, decl_attrs, NULL, NULL,
8426 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
8427 DECL_INITIAL (value) = width;
8429 SET_DECL_C_BIT_FIELD (value);
8431 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
8433 /* If we currently have a binding for this field, set the
8434 in_struct field in the binding, so that we warn about lookups
8436 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
8439 /* If the in_struct field is not yet set, push it on a list
8440 to be cleared when this struct is finished. */
8443 struct_parse_info->fields.safe_push (b);
8452 /* Subroutine of detect_field_duplicates: return whether X and Y,
8453 which are both fields in the same struct, have duplicate field
8457 is_duplicate_field (tree x, tree y)
8459 if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y))
8462 /* When using -fplan9-extensions, an anonymous field whose name is a
8463 typedef can duplicate a field name. */
8464 if (flag_plan9_extensions
8465 && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE))
8467 tree xt, xn, yt, yn;
8470 if (DECL_NAME (x) != NULL_TREE)
8472 else if (RECORD_OR_UNION_TYPE_P (xt)
8473 && TYPE_NAME (xt) != NULL_TREE
8474 && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL)
8475 xn = DECL_NAME (TYPE_NAME (xt));
8480 if (DECL_NAME (y) != NULL_TREE)
8482 else if (RECORD_OR_UNION_TYPE_P (yt)
8483 && TYPE_NAME (yt) != NULL_TREE
8484 && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL)
8485 yn = DECL_NAME (TYPE_NAME (yt));
8489 if (xn != NULL_TREE && xn == yn)
8496 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
8497 to HTAB, giving errors for any duplicates. */
8500 detect_field_duplicates_hash (tree fieldlist,
8501 hash_table<nofree_ptr_hash <tree_node> > *htab)
8506 for (x = fieldlist; x ; x = DECL_CHAIN (x))
8507 if ((y = DECL_NAME (x)) != NULL_TREE)
8509 slot = htab->find_slot (y, INSERT);
8512 error ("duplicate member %q+D", x);
8513 DECL_NAME (x) = NULL_TREE;
8517 else if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (x)))
8519 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab);
8521 /* When using -fplan9-extensions, an anonymous field whose
8522 name is a typedef can duplicate a field name. */
8523 if (flag_plan9_extensions
8524 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
8525 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)
8527 tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x)));
8528 slot = htab->find_slot (xn, INSERT);
8530 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x)));
8536 /* Generate an error for any duplicate field names in FIELDLIST. Munge
8537 the list such that this does not present a problem later. */
8540 detect_field_duplicates (tree fieldlist)
8545 /* If the struct is the list of instance variables of an Objective-C
8546 class, then we need to check all the instance variables of
8547 superclasses when checking for duplicates (since you can't have
8548 an instance variable in a subclass with the same name as an
8549 instance variable in a superclass). We pass on this job to the
8550 Objective-C compiler. objc_detect_field_duplicates() will return
8551 false if we are not checking the list of instance variables and
8552 the C frontend should proceed with the standard field duplicate
8553 checks. If we are checking the list of instance variables, the
8554 ObjC frontend will do the check, emit the errors if needed, and
8555 then return true. */
8556 if (c_dialect_objc ())
8557 if (objc_detect_field_duplicates (false))
8560 /* First, see if there are more than "a few" fields.
8561 This is trivially true if there are zero or one fields. */
8562 if (!fieldlist || !DECL_CHAIN (fieldlist))
8567 if (DECL_NAME (x) == NULL_TREE
8568 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x)))
8571 } while (timeout > 0 && x);
8573 /* If there were "few" fields and no anonymous structures or unions,
8574 avoid the overhead of allocating a hash table. Instead just do
8575 the nested traversal thing. */
8578 for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x))
8579 /* When using -fplan9-extensions, we can have duplicates
8580 between typedef names and fields. */
8582 || (flag_plan9_extensions
8583 && DECL_NAME (x) == NULL_TREE
8584 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x))
8585 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
8586 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL))
8588 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
8589 if (is_duplicate_field (y, x))
8591 error ("duplicate member %q+D", x);
8592 DECL_NAME (x) = NULL_TREE;
8598 hash_table<nofree_ptr_hash <tree_node> > htab (37);
8599 detect_field_duplicates_hash (fieldlist, &htab);
8603 /* Finish up struct info used by -Wc++-compat. */
8606 warn_cxx_compat_finish_struct (tree fieldlist, enum tree_code code,
8607 location_t record_loc)
8611 struct c_binding *b;
8613 if (fieldlist == NULL_TREE)
8615 if (code == RECORD_TYPE)
8616 warning_at (record_loc, OPT_Wc___compat,
8617 "empty struct has size 0 in C, size 1 in C++");
8619 warning_at (record_loc, OPT_Wc___compat,
8620 "empty union has size 0 in C, size 1 in C++");
8623 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
8624 the current struct. We do this now at the end of the struct
8625 because the flag is used to issue visibility warnings, and we
8626 only want to issue those warnings if the type is referenced
8627 outside of the struct declaration. */
8628 FOR_EACH_VEC_ELT (struct_parse_info->struct_types, ix, x)
8629 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
8631 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
8632 typedefs used when declaring fields in this struct. If the name
8633 of any of the fields is also a typedef name then the struct would
8634 not parse in C++, because the C++ lookup rules say that the
8635 typedef name would be looked up in the context of the struct, and
8636 would thus be the field rather than the typedef. */
8637 if (!struct_parse_info->typedefs_seen.is_empty ()
8638 && fieldlist != NULL_TREE)
8640 /* Use a hash_set<tree> using the name of the typedef. We can use
8641 a hash_set<tree> because identifiers are interned. */
8642 hash_set<tree> tset;
8644 FOR_EACH_VEC_ELT (struct_parse_info->typedefs_seen, ix, x)
8645 tset.add (DECL_NAME (x));
8647 for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x))
8649 if (DECL_NAME (x) != NULL_TREE
8650 && tset.contains (DECL_NAME (x)))
8652 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
8653 ("using %qD as both field and typedef name is "
8656 /* FIXME: It would be nice to report the location where
8657 the typedef name is used. */
8662 /* For each field which has a binding and which was not defined in
8663 an enclosing struct, clear the in_struct field. */
8664 FOR_EACH_VEC_ELT (struct_parse_info->fields, ix, b)
8668 /* Function to help qsort sort FIELD_DECLs by name order. */
8671 field_decl_cmp (const void *x_p, const void *y_p)
8673 const tree *const x = (const tree *) x_p;
8674 const tree *const y = (const tree *) y_p;
8676 if (DECL_NAME (*x) == DECL_NAME (*y))
8677 /* A nontype is "greater" than a type. */
8678 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL);
8679 if (DECL_NAME (*x) == NULL_TREE)
8681 if (DECL_NAME (*y) == NULL_TREE)
8683 if (DECL_NAME (*x) < DECL_NAME (*y))
8688 /* If this structure or union completes the type of any previous
8689 variable declaration, lay it out and output its rtl. */
8691 finish_incomplete_vars (tree incomplete_vars, bool toplevel)
8693 for (tree x = incomplete_vars; x; x = TREE_CHAIN (x))
8695 tree decl = TREE_VALUE (x);
8696 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
8697 layout_array_type (TREE_TYPE (decl));
8698 if (TREE_CODE (decl) != TYPE_DECL)
8700 relayout_decl (decl);
8701 if (c_dialect_objc ())
8702 objc_check_decl (decl);
8703 rest_of_decl_compilation (decl, toplevel, 0);
8708 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
8709 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
8710 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
8711 ATTRIBUTES are attributes to be applied to the structure.
8713 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
8714 the struct was started. */
8717 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
8718 class c_struct_parse_info *enclosing_struct_parse_info)
8721 bool toplevel = file_scope == current_scope;
8723 /* If this type was previously laid out as a forward reference,
8724 make sure we lay it out again. */
8726 TYPE_SIZE (t) = NULL_TREE;
8728 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
8732 for (x = fieldlist; x; x = DECL_CHAIN (x))
8734 if (DECL_NAME (x) != NULL_TREE)
8736 if (flag_isoc11 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x)))
8742 if (TREE_CODE (t) == UNION_TYPE)
8745 pedwarn (loc, OPT_Wpedantic, "union has no named members");
8747 pedwarn (loc, OPT_Wpedantic, "union has no members");
8752 pedwarn (loc, OPT_Wpedantic, "struct has no named members");
8754 pedwarn (loc, OPT_Wpedantic, "struct has no members");
8759 /* Install struct as DECL_CONTEXT of each field decl.
8760 Also process specified field sizes, found in the DECL_INITIAL,
8761 storing 0 there after the type has been changed to precision equal
8762 to its width, rather than the precision of the specified standard
8763 type. (Correct layout requires the original type to have been preserved
8766 bool saw_named_field = false;
8767 for (x = fieldlist; x; x = DECL_CHAIN (x))
8769 if (TREE_TYPE (x) == error_mark_node)
8772 DECL_CONTEXT (x) = t;
8774 /* If any field is const, the structure type is pseudo-const. */
8775 if (TREE_READONLY (x))
8776 C_TYPE_FIELDS_READONLY (t) = 1;
8779 /* A field that is pseudo-const makes the structure likewise. */
8780 tree t1 = strip_array_types (TREE_TYPE (x));
8781 if (RECORD_OR_UNION_TYPE_P (t1) && C_TYPE_FIELDS_READONLY (t1))
8782 C_TYPE_FIELDS_READONLY (t) = 1;
8785 /* Any field that is volatile means variables of this type must be
8786 treated in some ways as volatile. */
8787 if (TREE_THIS_VOLATILE (x))
8788 C_TYPE_FIELDS_VOLATILE (t) = 1;
8790 /* Any field of nominal variable size implies structure is too. */
8791 if (C_DECL_VARIABLE_SIZE (x))
8792 C_TYPE_VARIABLE_SIZE (t) = 1;
8794 if (DECL_C_BIT_FIELD (x))
8796 unsigned HOST_WIDE_INT width = tree_to_uhwi (DECL_INITIAL (x));
8797 DECL_SIZE (x) = bitsize_int (width);
8798 DECL_BIT_FIELD (x) = 1;
8802 && (DECL_BIT_FIELD (x)
8803 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
8804 DECL_PACKED (x) = 1;
8806 /* Detect flexible array member in an invalid context. */
8807 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
8808 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
8809 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
8810 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
8812 if (TREE_CODE (t) == UNION_TYPE)
8814 error_at (DECL_SOURCE_LOCATION (x),
8815 "flexible array member in union");
8816 TREE_TYPE (x) = error_mark_node;
8818 else if (DECL_CHAIN (x) != NULL_TREE)
8820 error_at (DECL_SOURCE_LOCATION (x),
8821 "flexible array member not at end of struct");
8822 TREE_TYPE (x) = error_mark_node;
8824 else if (!saw_named_field)
8826 error_at (DECL_SOURCE_LOCATION (x),
8827 "flexible array member in a struct with no named "
8829 TREE_TYPE (x) = error_mark_node;
8833 if (pedantic && TREE_CODE (t) == RECORD_TYPE
8834 && flexible_array_type_p (TREE_TYPE (x)))
8835 pedwarn (DECL_SOURCE_LOCATION (x), OPT_Wpedantic,
8836 "invalid use of structure with flexible array member");
8839 || RECORD_OR_UNION_TYPE_P (TREE_TYPE (x)))
8840 saw_named_field = true;
8843 detect_field_duplicates (fieldlist);
8845 /* Now we have the nearly final fieldlist. Record it,
8846 then lay out the structure or union (including the fields). */
8848 TYPE_FIELDS (t) = fieldlist;
8850 maybe_apply_pragma_scalar_storage_order (t);
8854 if (TYPE_SIZE_UNIT (t)
8855 && TREE_CODE (TYPE_SIZE_UNIT (t)) == INTEGER_CST
8856 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t))
8857 && !valid_constant_size_p (TYPE_SIZE_UNIT (t)))
8858 error ("type %qT is too large", t);
8860 /* Give bit-fields their proper types and rewrite the type of array fields
8861 with scalar component if the enclosing type has reverse storage order. */
8862 for (tree field = fieldlist; field; field = DECL_CHAIN (field))
8864 if (TREE_CODE (field) == FIELD_DECL
8865 && DECL_INITIAL (field)
8866 && TREE_TYPE (field) != error_mark_node)
8868 unsigned HOST_WIDE_INT width
8869 = tree_to_uhwi (DECL_INITIAL (field));
8870 tree type = TREE_TYPE (field);
8871 if (width != TYPE_PRECISION (type))
8874 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
8875 SET_DECL_MODE (field, TYPE_MODE (TREE_TYPE (field)));
8877 DECL_INITIAL (field) = NULL_TREE;
8879 else if (TYPE_REVERSE_STORAGE_ORDER (t)
8880 && TREE_CODE (field) == FIELD_DECL
8881 && TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE)
8883 tree ftype = TREE_TYPE (field);
8884 tree ctype = strip_array_types (ftype);
8885 if (!RECORD_OR_UNION_TYPE_P (ctype) && TYPE_MODE (ctype) != QImode)
8887 tree fmain_type = TYPE_MAIN_VARIANT (ftype);
8888 tree *typep = &fmain_type;
8890 *typep = build_distinct_type_copy (*typep);
8891 TYPE_REVERSE_STORAGE_ORDER (*typep) = 1;
8892 typep = &TREE_TYPE (*typep);
8893 } while (TREE_CODE (*typep) == ARRAY_TYPE);
8895 = c_build_qualified_type (fmain_type, TYPE_QUALS (ftype));
8899 /* Warn on problematic type punning for storage order purposes. */
8900 if (TREE_CODE (t) == UNION_TYPE
8901 && TREE_CODE (field) == FIELD_DECL
8902 && AGGREGATE_TYPE_P (TREE_TYPE (field)))
8904 tree ftype = TREE_TYPE (field);
8905 if (TREE_CODE (ftype) == ARRAY_TYPE)
8906 ftype = strip_array_types (ftype);
8907 if (RECORD_OR_UNION_TYPE_P (ftype)
8908 && TYPE_REVERSE_STORAGE_ORDER (ftype)
8909 != TYPE_REVERSE_STORAGE_ORDER (t))
8910 warning_at (DECL_SOURCE_LOCATION (field),
8911 OPT_Wscalar_storage_order,
8912 "type punning toggles scalar storage order");
8916 /* Now we have the truly final field list.
8917 Store it in this type and in the variants. */
8919 TYPE_FIELDS (t) = fieldlist;
8921 /* If there are lots of fields, sort so we can look through them fast.
8922 We arbitrarily consider 16 or more elts to be "a lot". */
8927 for (x = fieldlist; x; x = DECL_CHAIN (x))
8929 if (len > 15 || DECL_NAME (x) == NULL)
8937 struct lang_type *space;
8938 struct sorted_fields_type *space2;
8940 len += list_length (x);
8942 /* Use the same allocation policy here that make_node uses, to
8943 ensure that this lives as long as the rest of the struct decl.
8944 All decls in an inline function need to be saved. */
8946 space = ggc_cleared_alloc<struct lang_type> ();
8947 space2 = (sorted_fields_type *) ggc_internal_alloc
8948 (sizeof (struct sorted_fields_type) + len * sizeof (tree));
8952 field_array = &space2->elts[0];
8953 for (x = fieldlist; x; x = DECL_CHAIN (x))
8955 field_array[len++] = x;
8957 /* If there is anonymous struct or union, break out of the loop. */
8958 if (DECL_NAME (x) == NULL)
8961 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
8964 TYPE_LANG_SPECIFIC (t) = space;
8965 TYPE_LANG_SPECIFIC (t)->s->len = len;
8966 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
8967 qsort (field_array, len, sizeof (tree), field_decl_cmp);
8972 /* If this was supposed to be a transparent union, but we can't
8973 make it one, warn and turn off the flag. */
8974 if (TREE_CODE (t) == UNION_TYPE
8975 && TYPE_TRANSPARENT_AGGR (t)
8976 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
8978 TYPE_TRANSPARENT_AGGR (t) = 0;
8979 warning_at (loc, 0, "union cannot be made transparent");
8982 tree incomplete_vars = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
8983 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
8985 TYPE_FIELDS (x) = TYPE_FIELDS (t);
8986 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
8987 TYPE_TRANSPARENT_AGGR (x) = TYPE_TRANSPARENT_AGGR (t);
8988 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
8989 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
8990 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
8991 C_TYPE_INCOMPLETE_VARS (x) = NULL_TREE;
8994 /* Update type location to the one of the definition, instead of e.g.
8995 a forward declaration. */
8996 if (TYPE_STUB_DECL (t))
8997 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
8999 /* Finish debugging output for this type. */
9000 rest_of_type_compilation (t, toplevel);
9002 finish_incomplete_vars (incomplete_vars, toplevel);
9004 /* If we're inside a function proper, i.e. not file-scope and not still
9005 parsing parameters, then arrange for the size of a variable sized type
9007 if (building_stmt_list_p () && variably_modified_type_p (t, NULL_TREE))
9008 add_stmt (build_stmt (loc,
9009 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
9011 if (warn_cxx_compat)
9012 warn_cxx_compat_finish_struct (fieldlist, TREE_CODE (t), loc);
9014 delete struct_parse_info;
9016 struct_parse_info = enclosing_struct_parse_info;
9018 /* If this struct is defined inside a struct, add it to
9021 && struct_parse_info != NULL
9022 && !in_sizeof && !in_typeof && !in_alignof)
9023 struct_parse_info->struct_types.safe_push (t);
9029 gt_pointer_operator new_value;
9033 /* This routine compares two fields like field_decl_cmp but using the
9034 pointer operator in resort_data. */
9037 resort_field_decl_cmp (const void *x_p, const void *y_p)
9039 const tree *const x = (const tree *) x_p;
9040 const tree *const y = (const tree *) y_p;
9042 if (DECL_NAME (*x) == DECL_NAME (*y))
9043 /* A nontype is "greater" than a type. */
9044 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL);
9045 if (DECL_NAME (*x) == NULL_TREE)
9047 if (DECL_NAME (*y) == NULL_TREE)
9050 tree d1 = DECL_NAME (*x);
9051 tree d2 = DECL_NAME (*y);
9052 resort_data.new_value (&d1, &d1, resort_data.cookie);
9053 resort_data.new_value (&d2, &d2, resort_data.cookie);
9060 /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */
9063 resort_sorted_fields (void *obj,
9064 void * ARG_UNUSED (orig_obj),
9065 gt_pointer_operator new_value,
9068 struct sorted_fields_type *sf = (struct sorted_fields_type *) obj;
9069 resort_data.new_value = new_value;
9070 resort_data.cookie = cookie;
9071 qsort (&sf->elts[0], sf->len, sizeof (tree),
9072 resort_field_decl_cmp);
9075 /* Lay out the type T, and its element type, and so on. */
9078 layout_array_type (tree t)
9080 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
9081 layout_array_type (TREE_TYPE (t));
9085 /* Begin compiling the definition of an enumeration type.
9086 NAME is its name (or null if anonymous).
9087 LOC is the enum's location.
9088 Returns the type object, as yet incomplete.
9089 Also records info about it so that build_enumerator
9090 may be used to declare the individual values as they are read. */
9093 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
9095 tree enumtype = NULL_TREE;
9096 location_t enumloc = UNKNOWN_LOCATION;
9098 /* If this is the real definition for a previous forward reference,
9099 fill in the contents in the same object that used to be the
9100 forward reference. */
9102 if (name != NULL_TREE)
9103 enumtype = lookup_tag (ENUMERAL_TYPE, name, true, &enumloc);
9105 if (enumtype == NULL_TREE || TREE_CODE (enumtype) != ENUMERAL_TYPE)
9107 enumtype = make_node (ENUMERAL_TYPE);
9108 pushtag (loc, name, enumtype);
9110 /* Update type location to the one of the definition, instead of e.g.
9111 a forward declaration. */
9112 else if (TYPE_STUB_DECL (enumtype))
9114 enumloc = DECL_SOURCE_LOCATION (TYPE_STUB_DECL (enumtype));
9115 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (enumtype)) = loc;
9118 if (C_TYPE_BEING_DEFINED (enumtype))
9119 error_at (loc, "nested redefinition of %<enum %E%>", name);
9121 C_TYPE_BEING_DEFINED (enumtype) = 1;
9123 if (TYPE_VALUES (enumtype) != NULL_TREE)
9125 /* This enum is a named one that has been declared already. */
9126 auto_diagnostic_group d;
9127 error_at (loc, "redeclaration of %<enum %E%>", name);
9128 if (enumloc != UNKNOWN_LOCATION)
9129 inform (enumloc, "originally defined here");
9131 /* Completely replace its old definition.
9132 The old enumerators remain defined, however. */
9133 TYPE_VALUES (enumtype) = NULL_TREE;
9136 the_enum->enum_next_value = integer_zero_node;
9137 the_enum->enum_overflow = 0;
9139 if (flag_short_enums)
9140 for (tree v = TYPE_MAIN_VARIANT (enumtype); v; v = TYPE_NEXT_VARIANT (v))
9141 TYPE_PACKED (v) = 1;
9143 /* FIXME: This will issue a warning for a use of a type defined
9144 within sizeof in a statement expr. This is not terribly serious
9145 as C++ doesn't permit statement exprs within sizeof anyhow. */
9146 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
9147 warning_at (loc, OPT_Wc___compat,
9148 "defining type in %qs expression is invalid in C++",
9151 : (in_typeof ? "typeof" : "alignof")));
9156 /* After processing and defining all the values of an enumeration type,
9157 install their decls in the enumeration type and finish it off.
9158 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
9159 and ATTRIBUTES are the specified attributes.
9160 Returns ENUMTYPE. */
9163 finish_enum (tree enumtype, tree values, tree attributes)
9166 tree minnode = NULL_TREE, maxnode = NULL_TREE;
9169 bool toplevel = (file_scope == current_scope);
9170 struct lang_type *lt;
9172 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
9174 /* Calculate the maximum value of any enumerator in this type. */
9176 if (values == error_mark_node)
9177 minnode = maxnode = integer_zero_node;
9180 minnode = maxnode = TREE_VALUE (values);
9181 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
9183 tree value = TREE_VALUE (pair);
9184 if (tree_int_cst_lt (maxnode, value))
9186 if (tree_int_cst_lt (value, minnode))
9191 /* Construct the final type of this enumeration. It is the same
9192 as one of the integral types - the narrowest one that fits, except
9193 that normally we only go as narrow as int - and signed iff any of
9194 the values are negative. */
9195 sign = (tree_int_cst_sgn (minnode) >= 0) ? UNSIGNED : SIGNED;
9196 precision = MAX (tree_int_cst_min_precision (minnode, sign),
9197 tree_int_cst_min_precision (maxnode, sign));
9199 /* If the precision of the type was specified with an attribute and it
9200 was too small, give an error. Otherwise, use it. */
9201 if (TYPE_PRECISION (enumtype) && lookup_attribute ("mode", attributes))
9203 if (precision > TYPE_PRECISION (enumtype))
9205 TYPE_PRECISION (enumtype) = 0;
9206 error ("specified mode too small for enumerated values");
9209 precision = TYPE_PRECISION (enumtype);
9212 TYPE_PRECISION (enumtype) = 0;
9214 if (TYPE_PACKED (enumtype)
9215 || precision > TYPE_PRECISION (integer_type_node)
9216 || TYPE_PRECISION (enumtype))
9218 tem = c_common_type_for_size (precision, sign == UNSIGNED ? 1 : 0);
9221 warning (0, "enumeration values exceed range of largest integer");
9222 tem = long_long_integer_type_node;
9226 tem = sign == UNSIGNED ? unsigned_type_node : integer_type_node;
9228 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
9229 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
9230 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
9231 SET_TYPE_ALIGN (enumtype, TYPE_ALIGN (tem));
9232 TYPE_SIZE (enumtype) = NULL_TREE;
9233 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
9235 layout_type (enumtype);
9237 if (values != error_mark_node)
9239 /* Change the type of the enumerators to be the enum type. We
9240 need to do this irrespective of the size of the enum, for
9241 proper type checking. Replace the DECL_INITIALs of the
9242 enumerators, and the value slots of the list, with copies
9243 that have the enum type; they cannot be modified in place
9244 because they may be shared (e.g. integer_zero_node) Finally,
9245 change the purpose slots to point to the names of the decls. */
9246 for (pair = values; pair; pair = TREE_CHAIN (pair))
9248 tree enu = TREE_PURPOSE (pair);
9249 tree ini = DECL_INITIAL (enu);
9251 TREE_TYPE (enu) = enumtype;
9253 /* The ISO C Standard mandates enumerators to have type int,
9254 even though the underlying type of an enum type is
9255 unspecified. However, GCC allows enumerators of any
9256 integer type as an extensions. build_enumerator()
9257 converts any enumerators that fit in an int to type int,
9258 to avoid promotions to unsigned types when comparing
9259 integers with enumerators that fit in the int range.
9260 When -pedantic is given, build_enumerator() would have
9261 already warned about those that don't fit. Here we
9262 convert the rest to the enumerator type. */
9263 if (TREE_TYPE (ini) != integer_type_node)
9264 ini = convert (enumtype, ini);
9266 DECL_INITIAL (enu) = ini;
9267 TREE_PURPOSE (pair) = DECL_NAME (enu);
9268 /* To match the C++ FE, store the CONST_DECL rather than just its
9270 TREE_VALUE (pair) = enu;
9273 TYPE_VALUES (enumtype) = values;
9276 /* Record the min/max values so that we can warn about bit-field
9277 enumerations that are too small for the values. */
9278 lt = ggc_cleared_alloc<struct lang_type> ();
9279 lt->enum_min = minnode;
9280 lt->enum_max = maxnode;
9281 TYPE_LANG_SPECIFIC (enumtype) = lt;
9283 /* Fix up all variant types of this enum type. */
9284 tree incomplete_vars = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (enumtype));
9285 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
9287 C_TYPE_INCOMPLETE_VARS (tem) = NULL_TREE;
9288 if (tem == enumtype)
9290 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
9291 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
9292 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
9293 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
9294 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
9295 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
9296 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
9297 SET_TYPE_ALIGN (tem, TYPE_ALIGN (enumtype));
9298 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
9299 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
9300 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
9303 /* Finish debugging output for this type. */
9304 rest_of_type_compilation (enumtype, toplevel);
9306 finish_incomplete_vars (incomplete_vars, toplevel);
9308 /* If this enum is defined inside a struct, add it to
9311 && struct_parse_info != NULL
9312 && !in_sizeof && !in_typeof && !in_alignof)
9313 struct_parse_info->struct_types.safe_push (enumtype);
9315 C_TYPE_BEING_DEFINED (enumtype) = 0;
9320 /* Build and install a CONST_DECL for one value of the
9321 current enumeration type (one that was begun with start_enum).
9322 DECL_LOC is the location of the enumerator.
9323 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
9324 Return a tree-list containing the CONST_DECL and its value.
9325 Assignment of sequential values by default is handled here. */
9328 build_enumerator (location_t decl_loc, location_t loc,
9329 struct c_enum_contents *the_enum, tree name, tree value)
9333 /* Validate and default VALUE. */
9335 if (value != NULL_TREE)
9337 /* Don't issue more errors for error_mark_node (i.e. an
9338 undeclared identifier) - just ignore the value expression. */
9339 if (value == error_mark_node)
9341 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
9343 error_at (loc, "enumerator value for %qE is not an integer constant",
9349 if (TREE_CODE (value) != INTEGER_CST)
9351 value = c_fully_fold (value, false, NULL);
9352 if (TREE_CODE (value) == INTEGER_CST)
9353 pedwarn (loc, OPT_Wpedantic,
9354 "enumerator value for %qE is not an integer "
9355 "constant expression", name);
9357 if (TREE_CODE (value) != INTEGER_CST)
9359 error ("enumerator value for %qE is not an integer constant",
9365 value = default_conversion (value);
9366 constant_expression_warning (value);
9371 /* Default based on previous value. */
9372 /* It should no longer be possible to have NON_LVALUE_EXPR
9374 if (value == NULL_TREE)
9376 value = the_enum->enum_next_value;
9377 if (the_enum->enum_overflow)
9378 error_at (loc, "overflow in enumeration values");
9380 /* Even though the underlying type of an enum is unspecified, the
9381 type of enumeration constants is explicitly defined as int
9382 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
9384 else if (!int_fits_type_p (value, integer_type_node))
9385 pedwarn (loc, OPT_Wpedantic,
9386 "ISO C restricts enumerator values to range of %<int%>");
9388 /* The ISO C Standard mandates enumerators to have type int, even
9389 though the underlying type of an enum type is unspecified.
9390 However, GCC allows enumerators of any integer type as an
9391 extensions. Here we convert any enumerators that fit in an int
9392 to type int, to avoid promotions to unsigned types when comparing
9393 integers with enumerators that fit in the int range. When
9394 -pedantic is given, we would have already warned about those that
9395 don't fit. We have to do this here rather than in finish_enum
9396 because this value may be used to define more enumerators. */
9397 if (int_fits_type_p (value, integer_type_node))
9398 value = convert (integer_type_node, value);
9400 /* Set basis for default for next value. */
9401 the_enum->enum_next_value
9402 = build_binary_op (EXPR_LOC_OR_LOC (value, input_location),
9403 PLUS_EXPR, value, integer_one_node, false);
9404 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
9406 /* Now create a declaration for the enum value name. */
9408 type = TREE_TYPE (value);
9409 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
9410 TYPE_PRECISION (integer_type_node)),
9411 (TYPE_PRECISION (type)
9412 >= TYPE_PRECISION (integer_type_node)
9413 && TYPE_UNSIGNED (type)));
9415 decl = build_decl (decl_loc, CONST_DECL, name, type);
9416 DECL_INITIAL (decl) = convert (type, value);
9419 return tree_cons (decl, value, NULL_TREE);
9422 /* Implement LANG_HOOKS_SIMULATE_ENUM_DECL. */
9425 c_simulate_enum_decl (location_t loc, const char *name,
9426 vec<string_int_pair> *values_ptr)
9428 location_t saved_loc = input_location;
9429 input_location = loc;
9431 struct c_enum_contents the_enum;
9432 tree enumtype = start_enum (loc, &the_enum, get_identifier (name));
9434 tree value_chain = NULL_TREE;
9435 string_int_pair *value;
9436 vec<string_int_pair> values = *values_ptr;
9438 FOR_EACH_VEC_ELT (values, i, value)
9440 tree decl = build_enumerator (loc, loc, &the_enum,
9441 get_identifier (value->first),
9442 build_int_cst (integer_type_node,
9444 TREE_CHAIN (decl) = value_chain;
9448 finish_enum (enumtype, nreverse (value_chain), NULL_TREE);
9450 input_location = saved_loc;
9454 /* Implement LANG_HOOKS_SIMULATE_RECORD_DECL. */
9457 c_simulate_record_decl (location_t loc, const char *name,
9458 array_slice<const tree> fields)
9460 location_t saved_loc = input_location;
9461 input_location = loc;
9463 class c_struct_parse_info *struct_info;
9464 tree ident = get_identifier (name);
9465 tree type = start_struct (loc, RECORD_TYPE, ident, &struct_info);
9467 for (unsigned int i = 0; i < fields.size (); ++i)
9469 DECL_FIELD_CONTEXT (fields[i]) = type;
9471 DECL_CHAIN (fields[i - 1]) = fields[i];
9474 finish_struct (loc, type, fields[0], NULL_TREE, struct_info);
9476 tree decl = build_decl (loc, TYPE_DECL, ident, type);
9477 set_underlying_type (decl);
9478 lang_hooks.decls.pushdecl (decl);
9480 input_location = saved_loc;
9484 /* Create the FUNCTION_DECL for a function definition.
9485 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
9486 the declaration; they describe the function's name and the type it returns,
9487 but twisted together in a fashion that parallels the syntax of C.
9489 This function creates a binding context for the function body
9490 as well as setting up the FUNCTION_DECL in current_function_decl.
9492 Returns true on success. If the DECLARATOR is not suitable for a function
9493 (it defines a datum instead), we return false to report a parse error. */
9496 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
9499 tree decl1, old_decl;
9500 tree restype, resdecl;
9503 current_function_returns_value = 0; /* Assume, until we see it does. */
9504 current_function_returns_null = 0;
9505 current_function_returns_abnormally = 0;
9506 warn_about_return_type = 0;
9507 c_switch_stack = NULL;
9509 /* Indicate no valid break/continue context. */
9512 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
9513 &attributes, NULL, NULL, DEPRECATED_NORMAL);
9514 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION, decl1);
9516 /* If the declarator is not suitable for a function definition,
9517 cause a syntax error. */
9518 if (decl1 == NULL_TREE
9519 || TREE_CODE (decl1) != FUNCTION_DECL)
9522 loc = DECL_SOURCE_LOCATION (decl1);
9524 /* A nested function is not global. */
9525 if (current_function_decl != NULL_TREE)
9526 TREE_PUBLIC (decl1) = 0;
9528 c_decl_attributes (&decl1, attributes, 0);
9530 if (DECL_DECLARED_INLINE_P (decl1)
9531 && DECL_UNINLINABLE (decl1)
9532 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
9533 warning_at (loc, OPT_Wattributes,
9534 "inline function %qD given attribute %qs",
9537 /* Handle gnu_inline attribute. */
9538 if (declspecs->inline_p
9539 && !flag_gnu89_inline
9540 && TREE_CODE (decl1) == FUNCTION_DECL
9541 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
9542 || current_function_decl))
9544 if (declspecs->storage_class != csc_static)
9545 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
9548 announce_function (decl1);
9550 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
9552 error_at (loc, "return type is an incomplete type");
9553 /* Make it return void instead. */
9555 = build_function_type (void_type_node,
9556 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
9559 if (warn_about_return_type)
9560 warn_defaults_to (loc, flag_isoc99 ? OPT_Wimplicit_int
9561 : (warn_return_type > 0 ? OPT_Wreturn_type
9562 : OPT_Wimplicit_int),
9563 "return type defaults to %<int%>");
9565 /* Make the init_value nonzero so pushdecl knows this is not tentative.
9566 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
9567 DECL_INITIAL (decl1) = error_mark_node;
9569 /* If this definition isn't a prototype and we had a prototype declaration
9570 before, copy the arg type info from that prototype. */
9571 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
9572 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
9573 old_decl = NULL_TREE;
9575 current_function_prototype_locus = UNKNOWN_LOCATION;
9576 current_function_prototype_built_in = false;
9577 current_function_prototype_arg_types = NULL_TREE;
9578 tree newtype = TREE_TYPE (decl1);
9579 tree oldtype = old_decl ? TREE_TYPE (old_decl) : newtype;
9580 if (!prototype_p (newtype))
9582 tree oldrt = TREE_TYPE (oldtype);
9583 tree newrt = TREE_TYPE (newtype);
9584 if (old_decl != NULL_TREE
9585 && TREE_CODE (oldtype) == FUNCTION_TYPE
9586 && comptypes (oldrt, newrt))
9588 if (stdarg_p (oldtype))
9590 auto_diagnostic_group d;
9591 warning_at (loc, 0, "%q+D defined as variadic function "
9592 "without prototype", decl1);
9593 locate_old_decl (old_decl);
9595 TREE_TYPE (decl1) = composite_type (oldtype, newtype);
9596 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
9597 current_function_prototype_built_in
9598 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
9599 current_function_prototype_arg_types
9600 = TYPE_ARG_TYPES (newtype);
9602 if (TREE_PUBLIC (decl1))
9604 /* If there is an external prototype declaration of this
9605 function, record its location but do not copy information
9606 to this decl. This may be an invisible declaration
9607 (built-in or in a scope which has finished) or simply
9608 have more refined argument types than any declaration
9610 struct c_binding *b;
9611 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
9612 if (B_IN_SCOPE (b, external_scope))
9616 tree ext_decl, ext_type;
9618 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
9619 if (TREE_CODE (ext_type) == FUNCTION_TYPE
9620 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
9621 TREE_TYPE (ext_type)))
9623 current_function_prototype_locus
9624 = DECL_SOURCE_LOCATION (ext_decl);
9625 current_function_prototype_built_in
9626 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
9627 current_function_prototype_arg_types
9628 = TYPE_ARG_TYPES (ext_type);
9634 /* Optionally warn of old-fashioned def with no previous prototype. */
9635 if (warn_strict_prototypes
9636 && old_decl != error_mark_node
9637 && !prototype_p (TREE_TYPE (decl1))
9638 && C_DECL_ISNT_PROTOTYPE (old_decl))
9639 warning_at (loc, OPT_Wstrict_prototypes,
9640 "function declaration isn%'t a prototype");
9641 /* Optionally warn of any global def with no previous prototype. */
9642 else if (warn_missing_prototypes
9643 && old_decl != error_mark_node
9644 && TREE_PUBLIC (decl1)
9645 && !MAIN_NAME_P (DECL_NAME (decl1))
9646 && C_DECL_ISNT_PROTOTYPE (old_decl)
9647 && !DECL_DECLARED_INLINE_P (decl1))
9648 warning_at (loc, OPT_Wmissing_prototypes,
9649 "no previous prototype for %qD", decl1);
9650 /* Optionally warn of any def with no previous prototype
9651 if the function has already been used. */
9652 else if (warn_missing_prototypes
9653 && old_decl != NULL_TREE
9654 && old_decl != error_mark_node
9655 && TREE_USED (old_decl)
9656 && !prototype_p (TREE_TYPE (old_decl)))
9657 warning_at (loc, OPT_Wmissing_prototypes,
9658 "%qD was used with no prototype before its definition", decl1);
9659 /* Optionally warn of any global def with no previous declaration. */
9660 else if (warn_missing_declarations
9661 && TREE_PUBLIC (decl1)
9662 && old_decl == NULL_TREE
9663 && !MAIN_NAME_P (DECL_NAME (decl1))
9664 && !DECL_DECLARED_INLINE_P (decl1))
9665 warning_at (loc, OPT_Wmissing_declarations,
9666 "no previous declaration for %qD",
9668 /* Optionally warn of any def with no previous declaration
9669 if the function has already been used. */
9670 else if (warn_missing_declarations
9671 && old_decl != NULL_TREE
9672 && old_decl != error_mark_node
9673 && TREE_USED (old_decl)
9674 && C_DECL_IMPLICIT (old_decl))
9675 warning_at (loc, OPT_Wmissing_declarations,
9676 "%qD was used with no declaration before its definition", decl1);
9678 /* This function exists in static storage.
9679 (This does not mean `static' in the C sense!) */
9680 TREE_STATIC (decl1) = 1;
9682 /* This is the earliest point at which we might know the assembler
9683 name of the function. Thus, if it's set before this, die horribly. */
9684 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
9686 /* If #pragma weak was used, mark the decl weak now. */
9687 if (current_scope == file_scope)
9688 maybe_apply_pragma_weak (decl1);
9690 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
9691 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
9693 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
9694 != integer_type_node)
9695 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
9696 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1))))
9697 pedwarn (loc, OPT_Wmain, "%<_Atomic%>-qualified return type of %qD",
9700 check_main_parameter_types (decl1);
9702 if (!TREE_PUBLIC (decl1))
9703 pedwarn (loc, OPT_Wmain,
9704 "%qD is normally a non-static function", decl1);
9707 tree parms = current_function_arg_info->parms;
9710 location_t origloc = DECL_SOURCE_LOCATION (old_decl);
9711 warn_parm_array_mismatch (origloc, old_decl, parms);
9714 /* Record the decl so that the function name is defined.
9715 If we already have a decl for this name, and it is a FUNCTION_DECL,
9716 use the old decl. */
9718 current_function_decl = pushdecl (decl1);
9720 if (tree access = build_attr_access_from_parms (parms, false))
9721 decl_attributes (¤t_function_decl, access, ATTR_FLAG_INTERNAL,
9725 declare_parm_level ();
9727 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
9728 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
9729 DECL_ARTIFICIAL (resdecl) = 1;
9730 DECL_IGNORED_P (resdecl) = 1;
9731 DECL_RESULT (current_function_decl) = resdecl;
9733 start_fname_decls ();
9738 /* Subroutine of store_parm_decls which handles new-style function
9739 definitions (prototype format). The parms already have decls, so we
9740 need only record them as in effect and complain if any redundant
9741 old-style parm decls were written. */
9743 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
9749 if (current_scope->bindings)
9751 error_at (DECL_SOURCE_LOCATION (fndecl),
9752 "old-style parameter declarations in prototyped "
9753 "function definition");
9755 /* Get rid of the old-style declarations. */
9759 /* Don't issue this warning for nested functions, and don't issue this
9760 warning if we got here because ARG_INFO_TYPES was error_mark_node
9761 (this happens when a function definition has just an ellipsis in
9762 its parameter list). */
9763 else if (!in_system_header_at (input_location)
9764 && !current_function_scope
9765 && arg_info->types != error_mark_node)
9766 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
9767 "traditional C rejects ISO C style function definitions");
9769 /* Now make all the parameter declarations visible in the function body.
9770 We can bypass most of the grunt work of pushdecl. */
9771 for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl))
9773 DECL_CONTEXT (decl) = current_function_decl;
9774 if (DECL_NAME (decl))
9776 bind (DECL_NAME (decl), decl, current_scope,
9777 /*invisible=*/false, /*nested=*/false,
9779 if (!TREE_USED (decl))
9780 warn_if_shadowing (decl);
9783 pedwarn_c11 (DECL_SOURCE_LOCATION (decl), OPT_Wpedantic,
9784 "ISO C does not support omitting parameter names in "
9785 "function definitions before C2X");
9788 /* Record the parameter list in the function declaration. */
9789 DECL_ARGUMENTS (fndecl) = arg_info->parms;
9791 /* Now make all the ancillary declarations visible, likewise. */
9792 for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl))
9794 DECL_CONTEXT (decl) = current_function_decl;
9795 if (DECL_NAME (decl))
9796 bind (DECL_NAME (decl), decl, current_scope,
9797 /*invisible=*/false,
9798 /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL),
9802 /* And all the tag declarations. */
9803 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
9805 bind (tag->id, tag->type, current_scope,
9806 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
9809 /* Subroutine of store_parm_decls which handles old-style function
9810 definitions (separate parameter list and declarations). */
9813 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
9815 struct c_binding *b;
9816 tree parm, decl, last;
9817 tree parmids = arg_info->parms;
9818 hash_set<tree> seen_args;
9820 if (!in_system_header_at (input_location))
9823 pedwarn (DECL_SOURCE_LOCATION (fndecl),
9824 OPT_Wold_style_definition, "old-style function definition");
9826 warning_at (DECL_SOURCE_LOCATION (fndecl),
9827 OPT_Wold_style_definition,
9828 "old-style function definition");
9831 if (current_scope->had_vla_unspec)
9832 error ("%<[*]%> not allowed in other than function prototype scope");
9834 /* Match each formal parameter name with its declaration. Save each
9835 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
9836 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
9838 if (TREE_VALUE (parm) == NULL_TREE)
9840 error_at (DECL_SOURCE_LOCATION (fndecl),
9841 "parameter name missing from parameter list");
9842 TREE_PURPOSE (parm) = NULL_TREE;
9846 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
9847 if (b && B_IN_CURRENT_SCOPE (b))
9850 /* Skip erroneous parameters. */
9851 if (decl == error_mark_node)
9853 /* If we got something other than a PARM_DECL it is an error. */
9854 if (TREE_CODE (decl) != PARM_DECL)
9856 error_at (DECL_SOURCE_LOCATION (decl),
9857 "%qD declared as a non-parameter", decl);
9860 /* If the declaration is already marked, we have a duplicate
9861 name. Complain and ignore the duplicate. */
9862 else if (seen_args.contains (decl))
9864 error_at (DECL_SOURCE_LOCATION (decl),
9865 "multiple parameters named %qD", decl);
9866 TREE_PURPOSE (parm) = NULL_TREE;
9869 /* If the declaration says "void", complain and turn it into
9871 else if (VOID_TYPE_P (TREE_TYPE (decl)))
9873 error_at (DECL_SOURCE_LOCATION (decl),
9874 "parameter %qD declared with void type", decl);
9875 TREE_TYPE (decl) = integer_type_node;
9876 DECL_ARG_TYPE (decl) = integer_type_node;
9877 layout_decl (decl, 0);
9879 warn_if_shadowing (decl);
9881 /* If no declaration found, default to int. */
9884 /* FIXME diagnostics: This should be the location of the argument,
9885 not the FNDECL. E.g., for an old-style declaration
9887 int f10(v) { blah; }
9889 We should use the location of the V, not the F10.
9890 Unfortunately, the V is an IDENTIFIER_NODE which has no
9891 location. In the future we need locations for c_arg_info
9894 See gcc.dg/Wshadow-3.c for an example of this problem. */
9895 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
9896 PARM_DECL, TREE_VALUE (parm), integer_type_node);
9897 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
9899 warn_if_shadowing (decl);
9902 pedwarn (DECL_SOURCE_LOCATION (decl),
9903 OPT_Wimplicit_int, "type of %qD defaults to %<int%>",
9906 warning_at (DECL_SOURCE_LOCATION (decl),
9907 OPT_Wmissing_parameter_type,
9908 "type of %qD defaults to %<int%>", decl);
9911 TREE_PURPOSE (parm) = decl;
9912 seen_args.add (decl);
9915 /* Now examine the parms chain for incomplete declarations
9916 and declarations with no corresponding names. */
9918 for (b = current_scope->bindings; b; b = b->prev)
9921 if (TREE_CODE (parm) != PARM_DECL)
9924 if (TREE_TYPE (parm) != error_mark_node
9925 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
9927 error_at (DECL_SOURCE_LOCATION (parm),
9928 "parameter %qD has incomplete type", parm);
9929 TREE_TYPE (parm) = error_mark_node;
9932 if (!seen_args.contains (parm))
9934 error_at (DECL_SOURCE_LOCATION (parm),
9935 "declaration for parameter %qD but no such parameter",
9938 /* Pretend the parameter was not missing.
9939 This gets us to a standard state and minimizes
9940 further error messages. */
9941 parmids = chainon (parmids, tree_cons (parm, 0, 0));
9945 /* Chain the declarations together in the order of the list of
9946 names. Store that chain in the function decl, replacing the
9947 list of names. Update the current scope to match. */
9948 DECL_ARGUMENTS (fndecl) = NULL_TREE;
9950 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
9951 if (TREE_PURPOSE (parm))
9953 if (parm && TREE_PURPOSE (parm))
9955 last = TREE_PURPOSE (parm);
9956 DECL_ARGUMENTS (fndecl) = last;
9958 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
9959 if (TREE_PURPOSE (parm))
9961 DECL_CHAIN (last) = TREE_PURPOSE (parm);
9962 last = TREE_PURPOSE (parm);
9964 DECL_CHAIN (last) = NULL_TREE;
9967 /* If there was a previous prototype,
9968 set the DECL_ARG_TYPE of each argument according to
9969 the type previously specified, and report any mismatches. */
9971 if (current_function_prototype_arg_types)
9974 for (parm = DECL_ARGUMENTS (fndecl),
9975 type = current_function_prototype_arg_types;
9976 parm || (type != NULL_TREE
9977 && TREE_VALUE (type) != error_mark_node
9978 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
9979 parm = DECL_CHAIN (parm), type = TREE_CHAIN (type))
9981 if (parm == NULL_TREE
9982 || type == NULL_TREE
9983 || (TREE_VALUE (type) != error_mark_node
9984 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node))
9986 if (current_function_prototype_built_in)
9987 warning_at (DECL_SOURCE_LOCATION (fndecl),
9988 0, "number of arguments doesn%'t match "
9989 "built-in prototype");
9992 /* FIXME diagnostics: This should be the location of
9993 FNDECL, but there is bug when a prototype is
9994 declared inside function context, but defined
9995 outside of it (e.g., gcc.dg/pr15698-2.c). In
9996 which case FNDECL gets the location of the
9997 prototype, not the definition. */
9998 error_at (input_location,
9999 "number of arguments doesn%'t match prototype");
10001 error_at (current_function_prototype_locus,
10002 "prototype declaration");
10006 /* Type for passing arg must be consistent with that
10007 declared for the arg. ISO C says we take the unqualified
10008 type for parameters declared with qualified type. */
10009 if (TREE_TYPE (parm) != error_mark_node
10010 && TREE_VALUE (type) != error_mark_node
10011 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
10012 != TYPE_ATOMIC (TREE_VALUE (type)))
10013 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
10014 TYPE_MAIN_VARIANT (TREE_VALUE (type)))))
10016 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
10017 == TYPE_ATOMIC (TREE_VALUE (type)))
10018 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
10019 == TYPE_MAIN_VARIANT (TREE_VALUE (type))))
10021 /* Adjust argument to match prototype. E.g. a previous
10022 `int foo(float);' prototype causes
10023 `int foo(x) float x; {...}' to be treated like
10024 `int foo(float x) {...}'. This is particularly
10025 useful for argument types like uid_t. */
10026 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
10028 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
10029 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
10030 && (TYPE_PRECISION (TREE_TYPE (parm))
10031 < TYPE_PRECISION (integer_type_node)))
10032 DECL_ARG_TYPE (parm)
10033 = c_type_promotes_to (TREE_TYPE (parm));
10035 /* ??? Is it possible to get here with a
10036 built-in prototype or will it always have
10037 been diagnosed as conflicting with an
10038 old-style definition and discarded? */
10039 if (current_function_prototype_built_in)
10040 warning_at (DECL_SOURCE_LOCATION (parm),
10041 OPT_Wpedantic, "promoted argument %qD "
10042 "doesn%'t match built-in prototype", parm);
10045 pedwarn (DECL_SOURCE_LOCATION (parm),
10046 OPT_Wpedantic, "promoted argument %qD "
10047 "doesn%'t match prototype", parm);
10048 pedwarn (current_function_prototype_locus, OPT_Wpedantic,
10049 "prototype declaration");
10054 if (current_function_prototype_built_in)
10055 warning_at (DECL_SOURCE_LOCATION (parm),
10056 0, "argument %qD doesn%'t match "
10057 "built-in prototype", parm);
10060 error_at (DECL_SOURCE_LOCATION (parm),
10061 "argument %qD doesn%'t match prototype", parm);
10062 error_at (current_function_prototype_locus,
10063 "prototype declaration");
10068 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = NULL_TREE;
10071 /* Otherwise, create a prototype that would match. */
10075 tree actual = NULL_TREE, last = NULL_TREE, type;
10077 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm))
10079 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
10081 TREE_CHAIN (last) = type;
10086 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
10088 TREE_CHAIN (last) = type;
10092 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
10093 of the type of this function, but we need to avoid having this
10094 affect the types of other similarly-typed functions, so we must
10095 first force the generation of an identical (but separate) type
10096 node for the relevant function type. The new node we create
10097 will be a variant of the main variant of the original function
10100 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
10102 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
10106 /* Store parameter declarations passed in ARG_INFO into the current
10107 function declaration. */
10110 store_parm_decls_from (struct c_arg_info *arg_info)
10112 current_function_arg_info = arg_info;
10113 store_parm_decls ();
10116 /* Called by walk_tree to look for and update context-less labels
10117 or labels with context in the parent function. */
10120 set_labels_context_r (tree *tp, int *walk_subtrees, void *data)
10122 tree ctx = static_cast<tree>(data);
10123 if (TREE_CODE (*tp) == LABEL_EXPR
10124 && (DECL_CONTEXT (LABEL_EXPR_LABEL (*tp)) == NULL_TREE
10125 || DECL_CONTEXT (LABEL_EXPR_LABEL (*tp)) == DECL_CONTEXT (ctx)))
10127 DECL_CONTEXT (LABEL_EXPR_LABEL (*tp)) = ctx;
10128 *walk_subtrees = 0;
10134 /* Store the parameter declarations into the current function declaration.
10135 This is called after parsing the parameter declarations, before
10136 digesting the body of the function.
10138 For an old-style definition, construct a prototype out of the old-style
10139 parameter declarations and inject it into the function's type. */
10142 store_parm_decls (void)
10144 tree fndecl = current_function_decl;
10147 /* The argument information block for FNDECL. */
10148 struct c_arg_info *arg_info = current_function_arg_info;
10149 current_function_arg_info = 0;
10151 /* True if this definition is written with a prototype. In C2X, an
10152 empty argument list was converted to (void) in grokparms; in
10153 older C standard versions, it does not give the function a type
10154 with a prototype for future calls. */
10155 proto = arg_info->types != 0;
10158 store_parm_decls_newstyle (fndecl, arg_info);
10160 store_parm_decls_oldstyle (fndecl, arg_info);
10162 /* The next call to push_scope will be a function body. */
10164 next_is_function_body = true;
10166 /* Write a record describing this function definition to the prototypes
10167 file (if requested). */
10169 gen_aux_info_record (fndecl, 1, 0, proto);
10171 /* Initialize the RTL code for the function. */
10172 allocate_struct_function (fndecl, false);
10174 if (warn_unused_local_typedefs)
10175 cfun->language = ggc_cleared_alloc<language_function> ();
10177 /* Begin the statement tree for this function. */
10178 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
10180 /* ??? Insert the contents of the pending sizes list into the function
10181 to be evaluated. The only reason left to have this is
10182 void foo(int n, int array[n++])
10183 because we throw away the array type in favor of a pointer type, and
10184 thus won't naturally see the SAVE_EXPR containing the increment. All
10185 other pending sizes would be handled by gimplify_parameters. */
10186 if (arg_info->pending_sizes)
10188 /* In very special circumstances, e.g. for code like
10190 void f (int a[i += 2]) {}
10191 we need to execute the atomic assignment on function entry.
10192 But in this case, it is not just a straight store, it has the
10193 op= form, which means that build_atomic_assign has generated
10194 gotos, labels, etc. Because at that time the function decl
10195 for F has not been created yet, those labels do not have any
10196 function context. But we have the fndecl now, so update the
10197 labels accordingly. gimplify_expr would crash otherwise.
10198 Or with nested functions the labels could be created with parent
10199 function's context, while when the statement is emitted at the
10200 start of the nested function, it needs the nested function's
10202 walk_tree_without_duplicates (&arg_info->pending_sizes,
10203 set_labels_context_r, fndecl);
10204 add_stmt (arg_info->pending_sizes);
10208 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
10209 c_finish_omp_declare_simd for function prototypes. No diagnostics
10213 temp_store_parm_decls (tree fndecl, tree parms)
10216 for (tree p = parms; p; p = DECL_CHAIN (p))
10218 DECL_CONTEXT (p) = fndecl;
10220 bind (DECL_NAME (p), p, current_scope,
10221 /*invisible=*/false, /*nested=*/false,
10226 /* Undo what temp_store_parm_decls did. */
10229 temp_pop_parm_decls (void)
10231 /* Clear all bindings in this temporary scope, so that
10232 pop_scope doesn't create a BLOCK. */
10233 struct c_binding *b = current_scope->bindings;
10234 current_scope->bindings = NULL;
10235 for (; b; b = free_binding_and_advance (b))
10237 gcc_assert (TREE_CODE (b->decl) == PARM_DECL
10238 || b->decl == error_mark_node);
10239 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
10240 I_SYMBOL_BINDING (b->id) = b->shadowed;
10241 if (b->shadowed && b->shadowed->u.type)
10242 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
10248 /* Finish up a function declaration and compile that function
10249 all the way to assembler language output. Then free the storage
10250 for the function definition.
10252 This is called after parsing the body of the function definition. */
10255 finish_function (location_t end_loc)
10257 tree fndecl = current_function_decl;
10259 if (c_dialect_objc ())
10260 objc_finish_function ();
10262 if (TREE_CODE (fndecl) == FUNCTION_DECL
10263 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
10265 tree args = DECL_ARGUMENTS (fndecl);
10266 for (; args; args = DECL_CHAIN (args))
10268 tree type = TREE_TYPE (args);
10269 if (INTEGRAL_TYPE_P (type)
10270 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
10271 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
10275 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
10276 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
10278 /* Must mark the RESULT_DECL as being in this function. */
10280 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
10281 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
10283 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
10284 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
10285 == integer_type_node && flag_isoc99)
10287 /* Hack. We don't want the middle-end to warn that this return
10288 is unreachable, so we mark its location as special. Using
10289 UNKNOWN_LOCATION has the problem that it gets clobbered in
10290 annotate_one_with_locus. A cleaner solution might be to
10291 ensure ! should_carry_locus_p (stmt), but that needs a flag.
10293 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
10296 /* Tie off the statement tree for this function. */
10297 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
10299 finish_fname_decls ();
10301 /* Complain if there's no return statement only if option specified on
10303 if (warn_return_type > 0
10304 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
10305 && !current_function_returns_value && !current_function_returns_null
10306 /* Don't complain if we are no-return. */
10307 && !current_function_returns_abnormally
10308 /* Don't complain if we are declared noreturn. */
10309 && !TREE_THIS_VOLATILE (fndecl)
10310 /* Don't warn for main(). */
10311 && !MAIN_NAME_P (DECL_NAME (fndecl))
10312 /* Or if they didn't actually specify a return type. */
10313 && !C_FUNCTION_IMPLICIT_INT (fndecl)
10314 /* Normally, with -Wreturn-type, flow will complain, but we might
10315 optimize out static functions. */
10316 && !TREE_PUBLIC (fndecl)
10317 && targetm.warn_func_return (fndecl)
10318 && warning (OPT_Wreturn_type,
10319 "no return statement in function returning non-void"))
10320 suppress_warning (fndecl, OPT_Wreturn_type);
10322 /* Complain about parameters that are only set, but never otherwise used. */
10323 if (warn_unused_but_set_parameter)
10327 for (decl = DECL_ARGUMENTS (fndecl);
10329 decl = DECL_CHAIN (decl))
10330 if (TREE_USED (decl)
10331 && TREE_CODE (decl) == PARM_DECL
10332 && !DECL_READ_P (decl)
10333 && DECL_NAME (decl)
10334 && !DECL_ARTIFICIAL (decl)
10335 && !warning_suppressed_p (decl, OPT_Wunused_but_set_parameter))
10336 warning_at (DECL_SOURCE_LOCATION (decl),
10337 OPT_Wunused_but_set_parameter,
10338 "parameter %qD set but not used", decl);
10341 /* Complain about locally defined typedefs that are not used in this
10343 maybe_warn_unused_local_typedefs ();
10345 /* Possibly warn about unused parameters. */
10346 if (warn_unused_parameter)
10347 do_warn_unused_parameter (fndecl);
10349 /* Store the end of the function, so that we get good line number
10350 info for the epilogue. */
10351 cfun->function_end_locus = end_loc;
10353 /* Finalize the ELF visibility for the function. */
10354 c_determine_visibility (fndecl);
10356 /* For GNU C extern inline functions disregard inline limits. */
10357 if (DECL_EXTERNAL (fndecl)
10358 && DECL_DECLARED_INLINE_P (fndecl)
10359 && (flag_gnu89_inline
10360 || lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (fndecl))))
10361 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
10363 /* Genericize before inlining. Delay genericizing nested functions
10364 until their parent function is genericized. Since finalizing
10365 requires GENERIC, delay that as well. */
10367 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
10368 && !undef_nested_function)
10370 if (!decl_function_context (fndecl))
10372 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
10373 c_genericize (fndecl);
10375 /* ??? Objc emits functions after finalizing the compilation unit.
10376 This should be cleaned up later and this conditional removed. */
10377 if (symtab->global_info_ready)
10379 cgraph_node::add_new_function (fndecl, false);
10382 cgraph_node::finalize_function (fndecl, false);
10386 /* Register this function with cgraph just far enough to get it
10387 added to our parent's nested function list. Handy, since the
10388 C front end doesn't have such a list. */
10389 (void) cgraph_node::get_create (fndecl);
10393 if (!decl_function_context (fndecl))
10394 undef_nested_function = false;
10396 if (cfun->language != NULL)
10398 ggc_free (cfun->language);
10399 cfun->language = NULL;
10402 /* We're leaving the context of this function, so zap cfun.
10403 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
10404 tree_rest_of_compilation. */
10406 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION, current_function_decl);
10407 current_function_decl = NULL;
10410 /* Check the declarations given in a for-loop for satisfying the C99
10411 constraints. If exactly one such decl is found, return it. LOC is
10412 the location of the opening parenthesis of the for loop. The last
10413 parameter allows you to control the "for loop initial declarations
10414 are only allowed in C99 mode". Normally, you should pass
10415 flag_isoc99 as that parameter. But in some cases (Objective-C
10416 foreach loop, for example) we want to run the checks in this
10417 function even if not in C99 mode, so we allow the caller to turn
10418 off the error about not being in C99 mode.
10422 check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error)
10424 struct c_binding *b;
10425 tree one_decl = NULL_TREE;
10428 if (!turn_off_iso_c99_error)
10430 static bool hint = true;
10431 /* If we get here, declarations have been used in a for loop without
10432 the C99 for loop scope. This doesn't make much sense, so don't
10434 auto_diagnostic_group d;
10435 error_at (loc, "%<for%> loop initial declarations "
10436 "are only allowed in C99 or C11 mode");
10440 "use option %<-std=c99%>, %<-std=gnu99%>, %<-std=c11%> or "
10441 "%<-std=gnu11%> to compile your code");
10447 pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not support %<for%> loop "
10448 "initial declarations");
10450 /* C99 subclause 6.8.5 paragraph 3:
10452 [#3] The declaration part of a for statement shall only
10453 declare identifiers for objects having storage class auto or
10456 It isn't clear whether, in this sentence, "identifiers" binds to
10457 "shall only declare" or to "objects" - that is, whether all identifiers
10458 declared must be identifiers for objects, or whether the restriction
10459 only applies to those that are. (A question on this in comp.std.c
10460 in November 2000 received no answer.) We implement the strictest
10461 interpretation, to avoid creating an extension which later causes
10464 for (b = current_scope->bindings; b; b = b->prev)
10467 tree decl = b->decl;
10472 switch (TREE_CODE (decl))
10476 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
10477 if (TREE_STATIC (decl))
10478 error_at (decl_loc,
10479 "declaration of static variable %qD in %<for%> loop "
10480 "initial declaration", decl);
10481 else if (DECL_EXTERNAL (decl))
10482 error_at (decl_loc,
10483 "declaration of %<extern%> variable %qD in %<for%> loop "
10484 "initial declaration", decl);
10490 "%<struct %E%> declared in %<for%> loop initial "
10491 "declaration", id);
10495 "%<union %E%> declared in %<for%> loop initial declaration",
10498 case ENUMERAL_TYPE:
10499 error_at (loc, "%<enum %E%> declared in %<for%> loop "
10500 "initial declaration", id);
10503 error_at (loc, "declaration of non-variable "
10504 "%qD in %<for%> loop initial declaration", decl);
10511 return n_decls == 1 ? one_decl : NULL_TREE;
10514 /* Save and reinitialize the variables
10515 used during compilation of a C function. */
10518 c_push_function_context (void)
10520 struct language_function *p = cfun->language;
10521 /* cfun->language might have been already allocated by the use of
10522 -Wunused-local-typedefs. In that case, just re-use it. */
10524 cfun->language = p = ggc_cleared_alloc<language_function> ();
10526 p->base.x_stmt_tree = c_stmt_tree;
10527 c_stmt_tree.x_cur_stmt_list = vec_safe_copy (c_stmt_tree.x_cur_stmt_list);
10528 p->x_in_statement = in_statement;
10529 p->x_switch_stack = c_switch_stack;
10530 p->arg_info = current_function_arg_info;
10531 p->returns_value = current_function_returns_value;
10532 p->returns_null = current_function_returns_null;
10533 p->returns_abnormally = current_function_returns_abnormally;
10534 p->warn_about_return_type = warn_about_return_type;
10536 push_function_context ();
10539 /* Restore the variables used during compilation of a C function. */
10542 c_pop_function_context (void)
10544 struct language_function *p;
10546 pop_function_context ();
10547 p = cfun->language;
10549 /* When -Wunused-local-typedefs is in effect, cfun->languages is
10550 used to store data throughout the life time of the current cfun,
10551 So don't deallocate it. */
10552 if (!warn_unused_local_typedefs)
10553 cfun->language = NULL;
10555 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
10556 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
10558 /* Stop pointing to the local nodes about to be freed. */
10559 /* But DECL_INITIAL must remain nonzero so we know this
10560 was an actual function definition. */
10561 DECL_INITIAL (current_function_decl) = error_mark_node;
10562 DECL_ARGUMENTS (current_function_decl) = NULL_TREE;
10565 c_stmt_tree = p->base.x_stmt_tree;
10566 p->base.x_stmt_tree.x_cur_stmt_list = NULL;
10567 in_statement = p->x_in_statement;
10568 c_switch_stack = p->x_switch_stack;
10569 current_function_arg_info = p->arg_info;
10570 current_function_returns_value = p->returns_value;
10571 current_function_returns_null = p->returns_null;
10572 current_function_returns_abnormally = p->returns_abnormally;
10573 warn_about_return_type = p->warn_about_return_type;
10576 /* The functions below are required for functionality of doing
10577 function at once processing in the C front end. Currently these
10578 functions are not called from anywhere in the C front end, but as
10579 these changes continue, that will change. */
10581 /* Returns the stmt_tree (if any) to which statements are currently
10582 being added. If there is no active statement-tree, NULL is
10586 current_stmt_tree (void)
10588 return &c_stmt_tree;
10591 /* Return the global value of T as a symbol. */
10594 identifier_global_value (tree t)
10596 struct c_binding *b;
10598 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
10599 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
10605 /* Return the global value of tag T as a symbol. */
10608 identifier_global_tag (tree t)
10610 struct c_binding *b;
10612 for (b = I_TAG_BINDING (t); b; b = b->shadowed)
10613 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
10619 /* Returns true if NAME refers to a built-in function or function-like
10623 names_builtin_p (const char *name)
10625 tree id = get_identifier (name);
10626 if (tree decl = identifier_global_value (id))
10627 return TREE_CODE (decl) == FUNCTION_DECL && DECL_IS_UNDECLARED_BUILTIN (decl);
10629 /* Also detect common reserved C words that aren't strictly built-in
10631 switch (C_RID_CODE (id))
10633 case RID_BUILTIN_CONVERTVECTOR:
10634 case RID_BUILTIN_HAS_ATTRIBUTE:
10635 case RID_BUILTIN_SHUFFLE:
10636 case RID_BUILTIN_SHUFFLEVECTOR:
10637 case RID_BUILTIN_ASSOC_BARRIER:
10638 case RID_CHOOSE_EXPR:
10640 case RID_TYPES_COMPATIBLE_P:
10649 /* In C, the only C-linkage public declaration is at file scope. */
10652 c_linkage_bindings (tree name)
10654 return identifier_global_value (name);
10657 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
10658 otherwise the name is found in ridpointers from RID_INDEX. */
10661 record_builtin_type (enum rid rid_index, const char *name, tree type)
10665 id = ridpointers[(int) rid_index];
10667 id = get_identifier (name);
10668 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
10670 if (debug_hooks->type_decl)
10671 debug_hooks->type_decl (decl, false);
10674 /* Build the void_list_node (void_type_node having been created). */
10676 build_void_list_node (void)
10678 tree t = build_tree_list (NULL_TREE, void_type_node);
10682 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
10685 build_c_parm (struct c_declspecs *specs, tree attrs,
10686 struct c_declarator *declarator,
10689 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
10690 ret->specs = specs;
10691 ret->attrs = attrs;
10692 ret->declarator = declarator;
10697 /* Return a declarator with nested attributes. TARGET is the inner
10698 declarator to which these attributes apply. ATTRS are the
10701 struct c_declarator *
10702 build_attrs_declarator (tree attrs, struct c_declarator *target)
10704 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
10705 ret->kind = cdk_attrs;
10706 ret->declarator = target;
10707 ret->u.attrs = attrs;
10711 /* Return a declarator for a function with arguments specified by ARGS
10712 and return type specified by TARGET. */
10714 struct c_declarator *
10715 build_function_declarator (struct c_arg_info *args,
10716 struct c_declarator *target)
10718 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
10719 ret->kind = cdk_function;
10720 ret->declarator = target;
10721 ret->u.arg_info = args;
10725 /* Return a declarator for the identifier IDENT (which may be
10726 NULL_TREE for an abstract declarator). */
10728 struct c_declarator *
10729 build_id_declarator (tree ident)
10731 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
10732 ret->kind = cdk_id;
10733 ret->declarator = 0;
10734 ret->u.id.id = ident;
10735 ret->u.id.attrs = NULL_TREE;
10736 /* Default value - may get reset to a more precise location. */
10737 ret->id_loc = input_location;
10741 /* Return something to represent absolute declarators containing a *.
10742 TARGET is the absolute declarator that the * contains.
10743 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
10744 to apply to the pointer type. */
10746 struct c_declarator *
10747 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
10748 struct c_declarator *target)
10752 struct c_declarator *itarget = target;
10753 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
10754 if (type_quals_attrs)
10756 attrs = type_quals_attrs->attrs;
10757 quals = quals_from_declspecs (type_quals_attrs);
10758 if (attrs != NULL_TREE)
10759 itarget = build_attrs_declarator (attrs, target);
10761 ret->kind = cdk_pointer;
10762 ret->declarator = itarget;
10763 ret->u.pointer_quals = quals;
10767 /* Return a pointer to a structure for an empty list of declaration
10770 struct c_declspecs *
10771 build_null_declspecs (void)
10773 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
10774 memset (ret, 0, sizeof *ret);
10775 ret->align_log = -1;
10776 ret->typespec_word = cts_none;
10777 ret->storage_class = csc_none;
10778 ret->expr_const_operands = true;
10779 ret->typespec_kind = ctsk_none;
10780 ret->address_space = ADDR_SPACE_GENERIC;
10784 /* Add the address space ADDRSPACE to the declaration specifiers
10785 SPECS, returning SPECS. */
10787 struct c_declspecs *
10788 declspecs_add_addrspace (location_t location,
10789 struct c_declspecs *specs, addr_space_t as)
10791 specs->non_sc_seen_p = true;
10792 specs->declspecs_seen_p = true;
10793 specs->non_std_attrs_seen_p = true;
10795 if (!ADDR_SPACE_GENERIC_P (specs->address_space)
10796 && specs->address_space != as)
10797 error ("incompatible address space qualifiers %qs and %qs",
10798 c_addr_space_name (as),
10799 c_addr_space_name (specs->address_space));
10802 specs->address_space = as;
10803 specs->locations[cdw_address_space] = location;
10808 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
10809 returning SPECS. */
10811 struct c_declspecs *
10812 declspecs_add_qual (location_t loc,
10813 struct c_declspecs *specs, tree qual)
10817 specs->non_sc_seen_p = true;
10818 specs->declspecs_seen_p = true;
10819 specs->non_std_attrs_seen_p = true;
10820 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
10821 && C_IS_RESERVED_WORD (qual));
10822 i = C_RID_CODE (qual);
10823 location_t prev_loc = UNKNOWN_LOCATION;
10827 dupe = specs->const_p;
10828 specs->const_p = true;
10829 prev_loc = specs->locations[cdw_const];
10830 specs->locations[cdw_const] = loc;
10833 dupe = specs->volatile_p;
10834 specs->volatile_p = true;
10835 prev_loc = specs->locations[cdw_volatile];
10836 specs->locations[cdw_volatile] = loc;
10839 dupe = specs->restrict_p;
10840 specs->restrict_p = true;
10841 prev_loc = specs->locations[cdw_restrict];
10842 specs->locations[cdw_restrict] = loc;
10845 dupe = specs->atomic_p;
10846 specs->atomic_p = true;
10847 prev_loc = specs->locations[cdw_atomic];
10848 specs->locations[cdw_atomic] = loc;
10851 gcc_unreachable ();
10855 bool warned = pedwarn_c90 (loc, OPT_Wpedantic,
10856 "duplicate %qE declaration specifier", qual);
10858 && warn_duplicate_decl_specifier
10859 && prev_loc >= RESERVED_LOCATION_COUNT
10860 && !from_macro_expansion_at (prev_loc)
10861 && !from_macro_expansion_at (loc))
10862 warning_at (loc, OPT_Wduplicate_decl_specifier,
10863 "duplicate %qE declaration specifier", qual);
10868 /* Add the type specifier TYPE to the declaration specifiers SPECS,
10869 returning SPECS. */
10871 struct c_declspecs *
10872 declspecs_add_type (location_t loc, struct c_declspecs *specs,
10873 struct c_typespec spec)
10875 tree type = spec.spec;
10876 specs->non_sc_seen_p = true;
10877 specs->declspecs_seen_p = true;
10878 specs->non_std_attrs_seen_p = true;
10879 specs->typespec_kind = spec.kind;
10880 if (TREE_DEPRECATED (type))
10881 specs->deprecated_p = true;
10882 if (TREE_UNAVAILABLE (type))
10883 specs->unavailable_p = true;
10885 /* Handle type specifier keywords. */
10886 if (TREE_CODE (type) == IDENTIFIER_NODE
10887 && C_IS_RESERVED_WORD (type)
10888 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
10890 enum rid i = C_RID_CODE (type);
10893 error_at (loc, "two or more data types in declaration specifiers");
10896 if ((int) i <= (int) RID_LAST_MODIFIER)
10898 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
10903 if (specs->long_long_p)
10905 error_at (loc, "%<long long long%> is too long for GCC");
10910 if (specs->typespec_word == cts_double)
10913 ("both %<long long%> and %<double%> in "
10914 "declaration specifiers"));
10917 pedwarn_c90 (loc, OPT_Wlong_long,
10918 "ISO C90 does not support %<long long%>");
10919 specs->long_long_p = 1;
10920 specs->locations[cdw_long_long] = loc;
10923 if (specs->short_p)
10925 ("both %<long%> and %<short%> in "
10926 "declaration specifiers"));
10927 else if (specs->typespec_word == cts_auto_type)
10929 ("both %<long%> and %<__auto_type%> in "
10930 "declaration specifiers"));
10931 else if (specs->typespec_word == cts_void)
10933 ("both %<long%> and %<void%> in "
10934 "declaration specifiers"));
10935 else if (specs->typespec_word == cts_int_n)
10937 ("both %<long%> and %<__int%d%> in "
10938 "declaration specifiers"),
10939 int_n_data[specs->int_n_idx].bitsize);
10940 else if (specs->typespec_word == cts_bool)
10942 ("both %<long%> and %<_Bool%> in "
10943 "declaration specifiers"));
10944 else if (specs->typespec_word == cts_char)
10946 ("both %<long%> and %<char%> in "
10947 "declaration specifiers"));
10948 else if (specs->typespec_word == cts_float)
10950 ("both %<long%> and %<float%> in "
10951 "declaration specifiers"));
10952 else if (specs->typespec_word == cts_floatn_nx)
10954 ("both %<long%> and %<_Float%d%s%> in "
10955 "declaration specifiers"),
10956 floatn_nx_types[specs->floatn_nx_idx].n,
10957 (floatn_nx_types[specs->floatn_nx_idx].extended
10960 else if (specs->typespec_word == cts_dfloat32)
10962 ("both %<long%> and %<_Decimal32%> in "
10963 "declaration specifiers"));
10964 else if (specs->typespec_word == cts_dfloat64)
10966 ("both %<long%> and %<_Decimal64%> in "
10967 "declaration specifiers"));
10968 else if (specs->typespec_word == cts_dfloat128)
10970 ("both %<long%> and %<_Decimal128%> in "
10971 "declaration specifiers"));
10974 specs->long_p = true;
10975 specs->locations[cdw_long] = loc;
10979 dupe = specs->short_p;
10982 ("both %<long%> and %<short%> in "
10983 "declaration specifiers"));
10984 else if (specs->typespec_word == cts_auto_type)
10986 ("both %<short%> and %<__auto_type%> in "
10987 "declaration specifiers"));
10988 else if (specs->typespec_word == cts_void)
10990 ("both %<short%> and %<void%> in "
10991 "declaration specifiers"));
10992 else if (specs->typespec_word == cts_int_n)
10994 ("both %<short%> and %<__int%d%> in "
10995 "declaration specifiers"),
10996 int_n_data[specs->int_n_idx].bitsize);
10997 else if (specs->typespec_word == cts_bool)
10999 ("both %<short%> and %<_Bool%> in "
11000 "declaration specifiers"));
11001 else if (specs->typespec_word == cts_char)
11003 ("both %<short%> and %<char%> in "
11004 "declaration specifiers"));
11005 else if (specs->typespec_word == cts_float)
11007 ("both %<short%> and %<float%> in "
11008 "declaration specifiers"));
11009 else if (specs->typespec_word == cts_double)
11011 ("both %<short%> and %<double%> in "
11012 "declaration specifiers"));
11013 else if (specs->typespec_word == cts_floatn_nx)
11015 ("both %<short%> and %<_Float%d%s%> in "
11016 "declaration specifiers"),
11017 floatn_nx_types[specs->floatn_nx_idx].n,
11018 (floatn_nx_types[specs->floatn_nx_idx].extended
11021 else if (specs->typespec_word == cts_dfloat32)
11023 ("both %<short%> and %<_Decimal32%> in "
11024 "declaration specifiers"));
11025 else if (specs->typespec_word == cts_dfloat64)
11027 ("both %<short%> and %<_Decimal64%> in "
11028 "declaration specifiers"));
11029 else if (specs->typespec_word == cts_dfloat128)
11031 ("both %<short%> and %<_Decimal128%> in "
11032 "declaration specifiers"));
11035 specs->short_p = true;
11036 specs->locations[cdw_short] = loc;
11040 dupe = specs->signed_p;
11041 if (specs->unsigned_p)
11043 ("both %<signed%> and %<unsigned%> in "
11044 "declaration specifiers"));
11045 else if (specs->typespec_word == cts_auto_type)
11047 ("both %<signed%> and %<__auto_type%> in "
11048 "declaration specifiers"));
11049 else if (specs->typespec_word == cts_void)
11051 ("both %<signed%> and %<void%> in "
11052 "declaration specifiers"));
11053 else if (specs->typespec_word == cts_bool)
11055 ("both %<signed%> and %<_Bool%> in "
11056 "declaration specifiers"));
11057 else if (specs->typespec_word == cts_float)
11059 ("both %<signed%> and %<float%> in "
11060 "declaration specifiers"));
11061 else if (specs->typespec_word == cts_double)
11063 ("both %<signed%> and %<double%> in "
11064 "declaration specifiers"));
11065 else if (specs->typespec_word == cts_floatn_nx)
11067 ("both %<signed%> and %<_Float%d%s%> in "
11068 "declaration specifiers"),
11069 floatn_nx_types[specs->floatn_nx_idx].n,
11070 (floatn_nx_types[specs->floatn_nx_idx].extended
11073 else if (specs->typespec_word == cts_dfloat32)
11075 ("both %<signed%> and %<_Decimal32%> in "
11076 "declaration specifiers"));
11077 else if (specs->typespec_word == cts_dfloat64)
11079 ("both %<signed%> and %<_Decimal64%> in "
11080 "declaration specifiers"));
11081 else if (specs->typespec_word == cts_dfloat128)
11083 ("both %<signed%> and %<_Decimal128%> in "
11084 "declaration specifiers"));
11087 specs->signed_p = true;
11088 specs->locations[cdw_signed] = loc;
11092 dupe = specs->unsigned_p;
11093 if (specs->signed_p)
11095 ("both %<signed%> and %<unsigned%> in "
11096 "declaration specifiers"));
11097 else if (specs->typespec_word == cts_auto_type)
11099 ("both %<unsigned%> and %<__auto_type%> in "
11100 "declaration specifiers"));
11101 else if (specs->typespec_word == cts_void)
11103 ("both %<unsigned%> and %<void%> in "
11104 "declaration specifiers"));
11105 else if (specs->typespec_word == cts_bool)
11107 ("both %<unsigned%> and %<_Bool%> in "
11108 "declaration specifiers"));
11109 else if (specs->typespec_word == cts_float)
11111 ("both %<unsigned%> and %<float%> in "
11112 "declaration specifiers"));
11113 else if (specs->typespec_word == cts_double)
11115 ("both %<unsigned%> and %<double%> in "
11116 "declaration specifiers"));
11117 else if (specs->typespec_word == cts_floatn_nx)
11119 ("both %<unsigned%> and %<_Float%d%s%> in "
11120 "declaration specifiers"),
11121 floatn_nx_types[specs->floatn_nx_idx].n,
11122 (floatn_nx_types[specs->floatn_nx_idx].extended
11125 else if (specs->typespec_word == cts_dfloat32)
11127 ("both %<unsigned%> and %<_Decimal32%> in "
11128 "declaration specifiers"));
11129 else if (specs->typespec_word == cts_dfloat64)
11131 ("both %<unsigned%> and %<_Decimal64%> in "
11132 "declaration specifiers"));
11133 else if (specs->typespec_word == cts_dfloat128)
11135 ("both %<unsigned%> and %<_Decimal128%> in "
11136 "declaration specifiers"));
11139 specs->unsigned_p = true;
11140 specs->locations[cdw_unsigned] = loc;
11144 dupe = specs->complex_p;
11145 if (!in_system_header_at (loc))
11146 pedwarn_c90 (loc, OPT_Wpedantic,
11147 "ISO C90 does not support complex types");
11148 if (specs->typespec_word == cts_auto_type)
11150 ("both %<complex%> and %<__auto_type%> in "
11151 "declaration specifiers"));
11152 else if (specs->typespec_word == cts_void)
11154 ("both %<complex%> and %<void%> in "
11155 "declaration specifiers"));
11156 else if (specs->typespec_word == cts_bool)
11158 ("both %<complex%> and %<_Bool%> in "
11159 "declaration specifiers"));
11160 else if (specs->typespec_word == cts_dfloat32)
11162 ("both %<complex%> and %<_Decimal32%> in "
11163 "declaration specifiers"));
11164 else if (specs->typespec_word == cts_dfloat64)
11166 ("both %<complex%> and %<_Decimal64%> in "
11167 "declaration specifiers"));
11168 else if (specs->typespec_word == cts_dfloat128)
11170 ("both %<complex%> and %<_Decimal128%> in "
11171 "declaration specifiers"));
11172 else if (specs->typespec_word == cts_fract)
11174 ("both %<complex%> and %<_Fract%> in "
11175 "declaration specifiers"));
11176 else if (specs->typespec_word == cts_accum)
11178 ("both %<complex%> and %<_Accum%> in "
11179 "declaration specifiers"));
11180 else if (specs->saturating_p)
11182 ("both %<complex%> and %<_Sat%> in "
11183 "declaration specifiers"));
11186 specs->complex_p = true;
11187 specs->locations[cdw_complex] = loc;
11191 dupe = specs->saturating_p;
11192 pedwarn (loc, OPT_Wpedantic,
11193 "ISO C does not support saturating types");
11194 if (specs->typespec_word == cts_int_n)
11197 ("both %<_Sat%> and %<__int%d%> in "
11198 "declaration specifiers"),
11199 int_n_data[specs->int_n_idx].bitsize);
11201 else if (specs->typespec_word == cts_auto_type)
11203 ("both %<_Sat%> and %<__auto_type%> in "
11204 "declaration specifiers"));
11205 else if (specs->typespec_word == cts_void)
11207 ("both %<_Sat%> and %<void%> in "
11208 "declaration specifiers"));
11209 else if (specs->typespec_word == cts_bool)
11211 ("both %<_Sat%> and %<_Bool%> in "
11212 "declaration specifiers"));
11213 else if (specs->typespec_word == cts_char)
11215 ("both %<_Sat%> and %<char%> in "
11216 "declaration specifiers"));
11217 else if (specs->typespec_word == cts_int)
11219 ("both %<_Sat%> and %<int%> in "
11220 "declaration specifiers"));
11221 else if (specs->typespec_word == cts_float)
11223 ("both %<_Sat%> and %<float%> in "
11224 "declaration specifiers"));
11225 else if (specs->typespec_word == cts_double)
11227 ("both %<_Sat%> and %<double%> in "
11228 "declaration specifiers"));
11229 else if (specs->typespec_word == cts_floatn_nx)
11231 ("both %<_Sat%> and %<_Float%d%s%> in "
11232 "declaration specifiers"),
11233 floatn_nx_types[specs->floatn_nx_idx].n,
11234 (floatn_nx_types[specs->floatn_nx_idx].extended
11237 else if (specs->typespec_word == cts_dfloat32)
11239 ("both %<_Sat%> and %<_Decimal32%> in "
11240 "declaration specifiers"));
11241 else if (specs->typespec_word == cts_dfloat64)
11243 ("both %<_Sat%> and %<_Decimal64%> in "
11244 "declaration specifiers"));
11245 else if (specs->typespec_word == cts_dfloat128)
11247 ("both %<_Sat%> and %<_Decimal128%> in "
11248 "declaration specifiers"));
11249 else if (specs->complex_p)
11251 ("both %<_Sat%> and %<complex%> in "
11252 "declaration specifiers"));
11255 specs->saturating_p = true;
11256 specs->locations[cdw_saturating] = loc;
11260 gcc_unreachable ();
11264 error_at (loc, "duplicate %qE", type);
11270 /* "void", "_Bool", "char", "int", "float", "double",
11271 "_FloatN", "_FloatNx", "_Decimal32", "__intN",
11272 "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
11274 if (specs->typespec_word != cts_none)
11277 "two or more data types in declaration specifiers");
11282 case RID_AUTO_TYPE:
11285 ("both %<long%> and %<__auto_type%> in "
11286 "declaration specifiers"));
11287 else if (specs->short_p)
11289 ("both %<short%> and %<__auto_type%> in "
11290 "declaration specifiers"));
11291 else if (specs->signed_p)
11293 ("both %<signed%> and %<__auto_type%> in "
11294 "declaration specifiers"));
11295 else if (specs->unsigned_p)
11297 ("both %<unsigned%> and %<__auto_type%> in "
11298 "declaration specifiers"));
11299 else if (specs->complex_p)
11301 ("both %<complex%> and %<__auto_type%> in "
11302 "declaration specifiers"));
11303 else if (specs->saturating_p)
11305 ("both %<_Sat%> and %<__auto_type%> in "
11306 "declaration specifiers"));
11309 specs->typespec_word = cts_auto_type;
11310 specs->locations[cdw_typespec] = loc;
11317 specs->int_n_idx = i - RID_INT_N_0;
11318 if (!in_system_header_at (input_location)
11319 /* If the INT_N type ends in "__", and so is of the format
11320 "__intN__", don't pedwarn. */
11321 && (strncmp (IDENTIFIER_POINTER (type)
11322 + (IDENTIFIER_LENGTH (type) - 2), "__", 2) != 0))
11323 pedwarn (loc, OPT_Wpedantic,
11324 "ISO C does not support %<__int%d%> types",
11325 int_n_data[specs->int_n_idx].bitsize);
11329 ("both %<__int%d%> and %<long%> in "
11330 "declaration specifiers"),
11331 int_n_data[specs->int_n_idx].bitsize);
11332 else if (specs->saturating_p)
11334 ("both %<_Sat%> and %<__int%d%> in "
11335 "declaration specifiers"),
11336 int_n_data[specs->int_n_idx].bitsize);
11337 else if (specs->short_p)
11339 ("both %<__int%d%> and %<short%> in "
11340 "declaration specifiers"),
11341 int_n_data[specs->int_n_idx].bitsize);
11342 else if (! int_n_enabled_p[specs->int_n_idx])
11344 specs->typespec_word = cts_int_n;
11346 "%<__int%d%> is not supported on this target",
11347 int_n_data[specs->int_n_idx].bitsize);
11351 specs->typespec_word = cts_int_n;
11352 specs->locations[cdw_typespec] = loc;
11358 ("both %<long%> and %<void%> in "
11359 "declaration specifiers"));
11360 else if (specs->short_p)
11362 ("both %<short%> and %<void%> in "
11363 "declaration specifiers"));
11364 else if (specs->signed_p)
11366 ("both %<signed%> and %<void%> in "
11367 "declaration specifiers"));
11368 else if (specs->unsigned_p)
11370 ("both %<unsigned%> and %<void%> in "
11371 "declaration specifiers"));
11372 else if (specs->complex_p)
11374 ("both %<complex%> and %<void%> in "
11375 "declaration specifiers"));
11376 else if (specs->saturating_p)
11378 ("both %<_Sat%> and %<void%> in "
11379 "declaration specifiers"));
11382 specs->typespec_word = cts_void;
11383 specs->locations[cdw_typespec] = loc;
11387 if (!in_system_header_at (loc))
11388 pedwarn_c90 (loc, OPT_Wpedantic,
11389 "ISO C90 does not support boolean types");
11392 ("both %<long%> and %<_Bool%> in "
11393 "declaration specifiers"));
11394 else if (specs->short_p)
11396 ("both %<short%> and %<_Bool%> in "
11397 "declaration specifiers"));
11398 else if (specs->signed_p)
11400 ("both %<signed%> and %<_Bool%> in "
11401 "declaration specifiers"));
11402 else if (specs->unsigned_p)
11404 ("both %<unsigned%> and %<_Bool%> in "
11405 "declaration specifiers"));
11406 else if (specs->complex_p)
11408 ("both %<complex%> and %<_Bool%> in "
11409 "declaration specifiers"));
11410 else if (specs->saturating_p)
11412 ("both %<_Sat%> and %<_Bool%> in "
11413 "declaration specifiers"));
11416 specs->typespec_word = cts_bool;
11417 specs->locations[cdw_typespec] = loc;
11423 ("both %<long%> and %<char%> in "
11424 "declaration specifiers"));
11425 else if (specs->short_p)
11427 ("both %<short%> and %<char%> in "
11428 "declaration specifiers"));
11429 else if (specs->saturating_p)
11431 ("both %<_Sat%> and %<char%> in "
11432 "declaration specifiers"));
11435 specs->typespec_word = cts_char;
11436 specs->locations[cdw_typespec] = loc;
11440 if (specs->saturating_p)
11442 ("both %<_Sat%> and %<int%> in "
11443 "declaration specifiers"));
11446 specs->typespec_word = cts_int;
11447 specs->locations[cdw_typespec] = loc;
11453 ("both %<long%> and %<float%> in "
11454 "declaration specifiers"));
11455 else if (specs->short_p)
11457 ("both %<short%> and %<float%> in "
11458 "declaration specifiers"));
11459 else if (specs->signed_p)
11461 ("both %<signed%> and %<float%> in "
11462 "declaration specifiers"));
11463 else if (specs->unsigned_p)
11465 ("both %<unsigned%> and %<float%> in "
11466 "declaration specifiers"));
11467 else if (specs->saturating_p)
11469 ("both %<_Sat%> and %<float%> in "
11470 "declaration specifiers"));
11473 specs->typespec_word = cts_float;
11474 specs->locations[cdw_typespec] = loc;
11478 if (specs->long_long_p)
11480 ("both %<long long%> and %<double%> in "
11481 "declaration specifiers"));
11482 else if (specs->short_p)
11484 ("both %<short%> and %<double%> in "
11485 "declaration specifiers"));
11486 else if (specs->signed_p)
11488 ("both %<signed%> and %<double%> in "
11489 "declaration specifiers"));
11490 else if (specs->unsigned_p)
11492 ("both %<unsigned%> and %<double%> in "
11493 "declaration specifiers"));
11494 else if (specs->saturating_p)
11496 ("both %<_Sat%> and %<double%> in "
11497 "declaration specifiers"));
11500 specs->typespec_word = cts_double;
11501 specs->locations[cdw_typespec] = loc;
11504 CASE_RID_FLOATN_NX:
11505 specs->floatn_nx_idx = i - RID_FLOATN_NX_FIRST;
11506 if (!in_system_header_at (input_location))
11507 pedwarn (loc, OPT_Wpedantic,
11508 "ISO C does not support the %<_Float%d%s%> type",
11509 floatn_nx_types[specs->floatn_nx_idx].n,
11510 (floatn_nx_types[specs->floatn_nx_idx].extended
11516 ("both %<long%> and %<_Float%d%s%> in "
11517 "declaration specifiers"),
11518 floatn_nx_types[specs->floatn_nx_idx].n,
11519 (floatn_nx_types[specs->floatn_nx_idx].extended
11522 else if (specs->short_p)
11524 ("both %<short%> and %<_Float%d%s%> in "
11525 "declaration specifiers"),
11526 floatn_nx_types[specs->floatn_nx_idx].n,
11527 (floatn_nx_types[specs->floatn_nx_idx].extended
11530 else if (specs->signed_p)
11532 ("both %<signed%> and %<_Float%d%s%> in "
11533 "declaration specifiers"),
11534 floatn_nx_types[specs->floatn_nx_idx].n,
11535 (floatn_nx_types[specs->floatn_nx_idx].extended
11538 else if (specs->unsigned_p)
11540 ("both %<unsigned%> and %<_Float%d%s%> in "
11541 "declaration specifiers"),
11542 floatn_nx_types[specs->floatn_nx_idx].n,
11543 (floatn_nx_types[specs->floatn_nx_idx].extended
11546 else if (specs->saturating_p)
11548 ("both %<_Sat%> and %<_Float%d%s%> in "
11549 "declaration specifiers"),
11550 floatn_nx_types[specs->floatn_nx_idx].n,
11551 (floatn_nx_types[specs->floatn_nx_idx].extended
11554 else if (FLOATN_NX_TYPE_NODE (specs->floatn_nx_idx) == NULL_TREE)
11556 specs->typespec_word = cts_floatn_nx;
11558 "%<_Float%d%s%> is not supported on this target",
11559 floatn_nx_types[specs->floatn_nx_idx].n,
11560 (floatn_nx_types[specs->floatn_nx_idx].extended
11566 specs->typespec_word = cts_floatn_nx;
11567 specs->locations[cdw_typespec] = loc;
11572 case RID_DFLOAT128:
11575 if (i == RID_DFLOAT32)
11576 str = "_Decimal32";
11577 else if (i == RID_DFLOAT64)
11578 str = "_Decimal64";
11580 str = "_Decimal128";
11581 if (specs->long_long_p)
11583 ("both %<long long%> and %qs in "
11584 "declaration specifiers"),
11588 ("both %<long%> and %qs in "
11589 "declaration specifiers"),
11591 else if (specs->short_p)
11593 ("both %<short%> and %qs in "
11594 "declaration specifiers"),
11596 else if (specs->signed_p)
11598 ("both %<signed%> and %qs in "
11599 "declaration specifiers"),
11601 else if (specs->unsigned_p)
11603 ("both %<unsigned%> and %qs in "
11604 "declaration specifiers"),
11606 else if (specs->complex_p)
11608 ("both %<complex%> and %qs in "
11609 "declaration specifiers"),
11611 else if (specs->saturating_p)
11613 ("both %<_Sat%> and %qs in "
11614 "declaration specifiers"),
11616 else if (i == RID_DFLOAT32)
11617 specs->typespec_word = cts_dfloat32;
11618 else if (i == RID_DFLOAT64)
11619 specs->typespec_word = cts_dfloat64;
11621 specs->typespec_word = cts_dfloat128;
11622 specs->locations[cdw_typespec] = loc;
11624 if (!targetm.decimal_float_supported_p ())
11626 ("decimal floating-point not supported "
11627 "for this target"));
11628 pedwarn_c11 (loc, OPT_Wpedantic,
11629 "ISO C does not support decimal floating-point "
11636 if (i == RID_FRACT)
11640 if (specs->complex_p)
11642 ("both %<complex%> and %qs in "
11643 "declaration specifiers"),
11645 else if (i == RID_FRACT)
11646 specs->typespec_word = cts_fract;
11648 specs->typespec_word = cts_accum;
11649 specs->locations[cdw_typespec] = loc;
11651 if (!targetm.fixed_point_supported_p ())
11653 "fixed-point types not supported for this target");
11654 pedwarn (loc, OPT_Wpedantic,
11655 "ISO C does not support fixed-point types");
11658 /* ObjC reserved word "id", handled below. */
11664 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
11665 form of ObjC type, cases such as "int" and "long" being handled
11666 above), a TYPE (struct, union, enum and typeof specifiers) or an
11667 ERROR_MARK. In none of these cases may there have previously
11668 been any type specifiers. */
11669 if (specs->type || specs->typespec_word != cts_none
11670 || specs->long_p || specs->short_p || specs->signed_p
11671 || specs->unsigned_p || specs->complex_p)
11672 error_at (loc, "two or more data types in declaration specifiers");
11673 else if (TREE_CODE (type) == TYPE_DECL)
11675 if (TREE_TYPE (type) == error_mark_node)
11676 ; /* Allow the type to default to int to avoid cascading errors. */
11679 specs->type = TREE_TYPE (type);
11680 specs->decl_attr = DECL_ATTRIBUTES (type);
11681 specs->typedef_p = true;
11682 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
11683 specs->locations[cdw_typedef] = loc;
11685 /* If this typedef name is defined in a struct, then a C++
11686 lookup would return a different value. */
11687 if (warn_cxx_compat
11688 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
11689 warning_at (loc, OPT_Wc___compat,
11690 "C++ lookup of %qD would return a field, not a type",
11693 /* If we are parsing a struct, record that a struct field
11695 if (warn_cxx_compat && struct_parse_info != NULL)
11696 struct_parse_info->typedefs_seen.safe_push (type);
11699 else if (TREE_CODE (type) == IDENTIFIER_NODE)
11701 tree t = lookup_name (type);
11702 if (!t || TREE_CODE (t) != TYPE_DECL)
11703 error_at (loc, "%qE fails to be a typedef or built in type", type);
11704 else if (TREE_TYPE (t) == error_mark_node)
11708 specs->type = TREE_TYPE (t);
11709 specs->locations[cdw_typespec] = loc;
11714 if (TREE_CODE (type) != ERROR_MARK && spec.kind == ctsk_typeof)
11716 specs->typedef_p = true;
11717 specs->locations[cdw_typedef] = loc;
11721 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
11722 specs->expr, spec.expr);
11724 specs->expr = spec.expr;
11725 specs->expr_const_operands &= spec.expr_const_operands;
11728 specs->type = type;
11734 /* Add the storage class specifier or function specifier SCSPEC to the
11735 declaration specifiers SPECS, returning SPECS. */
11737 struct c_declspecs *
11738 declspecs_add_scspec (location_t loc,
11739 struct c_declspecs *specs,
11743 enum c_storage_class n = csc_none;
11745 specs->declspecs_seen_p = true;
11746 specs->non_std_attrs_seen_p = true;
11747 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
11748 && C_IS_RESERVED_WORD (scspec));
11749 i = C_RID_CODE (scspec);
11750 if (specs->non_sc_seen_p)
11751 warning (OPT_Wold_style_declaration,
11752 "%qE is not at beginning of declaration", scspec);
11756 /* C99 permits duplicate inline. Although of doubtful utility,
11757 it seems simplest to permit it in gnu89 mode as well, as
11758 there is also little utility in maintaining this as a
11759 difference between gnu89 and C99 inline. */
11761 specs->inline_p = true;
11762 specs->locations[cdw_inline] = loc;
11765 /* Duplicate _Noreturn is permitted. */
11767 specs->noreturn_p = true;
11768 specs->locations[cdw_noreturn] = loc;
11771 dupe = specs->thread_p;
11772 if (specs->storage_class == csc_auto)
11773 error ("%qE used with %<auto%>", scspec);
11774 else if (specs->storage_class == csc_register)
11775 error ("%qE used with %<register%>", scspec);
11776 else if (specs->storage_class == csc_typedef)
11777 error ("%qE used with %<typedef%>", scspec);
11780 specs->thread_p = true;
11781 specs->thread_gnu_p = (strcmp (IDENTIFIER_POINTER (scspec),
11783 /* A diagnostic is not required for the use of this
11784 identifier in the implementation namespace; only diagnose
11785 it for the C11 spelling because of existing code using
11786 the other spelling. */
11787 if (!specs->thread_gnu_p)
11790 pedwarn_c99 (loc, OPT_Wpedantic,
11791 "ISO C99 does not support %qE", scspec);
11793 pedwarn_c99 (loc, OPT_Wpedantic,
11794 "ISO C90 does not support %qE", scspec);
11796 specs->locations[cdw_thread] = loc;
11804 /* Diagnose "__thread extern". */
11805 if (specs->thread_p && specs->thread_gnu_p)
11806 error ("%<__thread%> before %<extern%>");
11813 /* Diagnose "__thread static". */
11814 if (specs->thread_p && specs->thread_gnu_p)
11815 error ("%<__thread%> before %<static%>");
11821 gcc_unreachable ();
11823 if (n != csc_none && n == specs->storage_class)
11827 if (i == RID_THREAD)
11828 error ("duplicate %<_Thread_local%> or %<__thread%>");
11830 error ("duplicate %qE", scspec);
11834 if (specs->storage_class != csc_none && n != specs->storage_class)
11836 error ("multiple storage classes in declaration specifiers");
11840 specs->storage_class = n;
11841 specs->locations[cdw_storage_class] = loc;
11842 if (n != csc_extern && n != csc_static && specs->thread_p)
11844 error ("%qs used with %qE",
11845 specs->thread_gnu_p ? "__thread" : "_Thread_local",
11847 specs->thread_p = false;
11854 /* Add the attributes ATTRS to the declaration specifiers SPECS,
11855 returning SPECS. */
11857 struct c_declspecs *
11858 declspecs_add_attrs (location_t loc, struct c_declspecs *specs, tree attrs)
11860 specs->attrs = chainon (attrs, specs->attrs);
11861 specs->locations[cdw_attributes] = loc;
11862 specs->declspecs_seen_p = true;
11863 /* In the case of standard attributes at the start of the
11864 declaration, the caller will reset this. */
11865 specs->non_std_attrs_seen_p = true;
11869 /* Add an _Alignas specifier (expression ALIGN, or type whose
11870 alignment is ALIGN) to the declaration specifiers SPECS, returning
11872 struct c_declspecs *
11873 declspecs_add_alignas (location_t loc,
11874 struct c_declspecs *specs, tree align)
11876 specs->alignas_p = true;
11877 specs->locations[cdw_alignas] = loc;
11878 if (align == error_mark_node)
11881 /* Only accept the alignment if it's valid and greater than
11882 the current one. Zero is invalid but by C11 required to
11883 be silently ignored. */
11884 int align_log = check_user_alignment (align, false, /* warn_zero = */false);
11885 if (align_log > specs->align_log)
11886 specs->align_log = align_log;
11890 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
11891 specifiers with any other type specifier to determine the resulting
11892 type. This is where ISO C checks on complex types are made, since
11893 "_Complex long" is a prefix of the valid ISO C type "_Complex long
11894 double". Also apply postfix standard attributes to modify the type. */
11896 struct c_declspecs *
11897 finish_declspecs (struct c_declspecs *specs)
11899 /* If a type was specified as a whole, we have no modifiers and are
11901 if (specs->type != NULL_TREE)
11903 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
11904 && !specs->signed_p && !specs->unsigned_p
11905 && !specs->complex_p);
11907 /* Set a dummy type. */
11908 if (TREE_CODE (specs->type) == ERROR_MARK)
11909 specs->type = integer_type_node;
11910 goto handle_postfix_attrs;
11913 /* If none of "void", "_Bool", "char", "int", "float" or "double"
11914 has been specified, treat it as "int" unless "_Complex" is
11915 present and there are no other specifiers. If we just have
11916 "_Complex", it is equivalent to "_Complex double", but e.g.
11917 "_Complex short" is equivalent to "_Complex short int". */
11918 if (specs->typespec_word == cts_none)
11920 if (specs->saturating_p)
11922 error_at (specs->locations[cdw_saturating],
11923 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
11924 if (!targetm.fixed_point_supported_p ())
11925 error_at (specs->locations[cdw_saturating],
11926 "fixed-point types not supported for this target");
11927 specs->typespec_word = cts_fract;
11929 else if (specs->long_p || specs->short_p
11930 || specs->signed_p || specs->unsigned_p)
11932 specs->typespec_word = cts_int;
11934 else if (specs->complex_p)
11936 specs->typespec_word = cts_double;
11937 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
11938 "ISO C does not support plain %<complex%> meaning "
11939 "%<double complex%>");
11943 specs->typespec_word = cts_int;
11944 specs->default_int_p = true;
11945 /* We don't diagnose this here because grokdeclarator will
11946 give more specific diagnostics according to whether it is
11947 a function definition. */
11951 /* If "signed" was specified, record this to distinguish "int" and
11952 "signed int" in the case of a bit-field with
11953 -funsigned-bitfields. */
11954 specs->explicit_signed_p = specs->signed_p;
11956 /* Now compute the actual type. */
11957 switch (specs->typespec_word)
11959 case cts_auto_type:
11960 gcc_assert (!specs->long_p && !specs->short_p
11961 && !specs->signed_p && !specs->unsigned_p
11962 && !specs->complex_p);
11963 /* Type to be filled in later. */
11964 if (specs->postfix_attrs)
11965 error ("%<__auto_type%> followed by %<[[]]%> attributes");
11968 gcc_assert (!specs->long_p && !specs->short_p
11969 && !specs->signed_p && !specs->unsigned_p
11970 && !specs->complex_p);
11971 specs->type = void_type_node;
11974 gcc_assert (!specs->long_p && !specs->short_p
11975 && !specs->signed_p && !specs->unsigned_p
11976 && !specs->complex_p);
11977 specs->type = boolean_type_node;
11980 gcc_assert (!specs->long_p && !specs->short_p);
11981 gcc_assert (!(specs->signed_p && specs->unsigned_p));
11982 if (specs->signed_p)
11983 specs->type = signed_char_type_node;
11984 else if (specs->unsigned_p)
11985 specs->type = unsigned_char_type_node;
11987 specs->type = char_type_node;
11988 if (specs->complex_p)
11990 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
11991 "ISO C does not support complex integer types");
11992 specs->type = build_complex_type (specs->type);
11996 gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p);
11997 gcc_assert (!(specs->signed_p && specs->unsigned_p));
11998 if (! int_n_enabled_p[specs->int_n_idx])
11999 specs->type = integer_type_node;
12001 specs->type = (specs->unsigned_p
12002 ? int_n_trees[specs->int_n_idx].unsigned_type
12003 : int_n_trees[specs->int_n_idx].signed_type);
12004 if (specs->complex_p)
12006 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
12007 "ISO C does not support complex integer types");
12008 specs->type = build_complex_type (specs->type);
12012 gcc_assert (!(specs->long_p && specs->short_p));
12013 gcc_assert (!(specs->signed_p && specs->unsigned_p));
12014 if (specs->long_long_p)
12015 specs->type = (specs->unsigned_p
12016 ? long_long_unsigned_type_node
12017 : long_long_integer_type_node);
12018 else if (specs->long_p)
12019 specs->type = (specs->unsigned_p
12020 ? long_unsigned_type_node
12021 : long_integer_type_node);
12022 else if (specs->short_p)
12023 specs->type = (specs->unsigned_p
12024 ? short_unsigned_type_node
12025 : short_integer_type_node);
12027 specs->type = (specs->unsigned_p
12028 ? unsigned_type_node
12029 : integer_type_node);
12030 if (specs->complex_p)
12032 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
12033 "ISO C does not support complex integer types");
12034 specs->type = build_complex_type (specs->type);
12038 gcc_assert (!specs->long_p && !specs->short_p
12039 && !specs->signed_p && !specs->unsigned_p);
12040 specs->type = (specs->complex_p
12041 ? complex_float_type_node
12042 : float_type_node);
12045 gcc_assert (!specs->long_long_p && !specs->short_p
12046 && !specs->signed_p && !specs->unsigned_p);
12049 specs->type = (specs->complex_p
12050 ? complex_long_double_type_node
12051 : long_double_type_node);
12055 specs->type = (specs->complex_p
12056 ? complex_double_type_node
12057 : double_type_node);
12060 case cts_floatn_nx:
12061 gcc_assert (!specs->long_p && !specs->short_p
12062 && !specs->signed_p && !specs->unsigned_p);
12063 if (FLOATN_NX_TYPE_NODE (specs->floatn_nx_idx) == NULL_TREE)
12064 specs->type = integer_type_node;
12065 else if (specs->complex_p)
12066 specs->type = COMPLEX_FLOATN_NX_TYPE_NODE (specs->floatn_nx_idx);
12068 specs->type = FLOATN_NX_TYPE_NODE (specs->floatn_nx_idx);
12072 case cts_dfloat128:
12073 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
12074 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
12075 if (!targetm.decimal_float_supported_p ())
12076 specs->type = integer_type_node;
12077 else if (specs->typespec_word == cts_dfloat32)
12078 specs->type = dfloat32_type_node;
12079 else if (specs->typespec_word == cts_dfloat64)
12080 specs->type = dfloat64_type_node;
12082 specs->type = dfloat128_type_node;
12085 gcc_assert (!specs->complex_p);
12086 if (!targetm.fixed_point_supported_p ())
12087 specs->type = integer_type_node;
12088 else if (specs->saturating_p)
12090 if (specs->long_long_p)
12091 specs->type = specs->unsigned_p
12092 ? sat_unsigned_long_long_fract_type_node
12093 : sat_long_long_fract_type_node;
12094 else if (specs->long_p)
12095 specs->type = specs->unsigned_p
12096 ? sat_unsigned_long_fract_type_node
12097 : sat_long_fract_type_node;
12098 else if (specs->short_p)
12099 specs->type = specs->unsigned_p
12100 ? sat_unsigned_short_fract_type_node
12101 : sat_short_fract_type_node;
12103 specs->type = specs->unsigned_p
12104 ? sat_unsigned_fract_type_node
12105 : sat_fract_type_node;
12109 if (specs->long_long_p)
12110 specs->type = specs->unsigned_p
12111 ? unsigned_long_long_fract_type_node
12112 : long_long_fract_type_node;
12113 else if (specs->long_p)
12114 specs->type = specs->unsigned_p
12115 ? unsigned_long_fract_type_node
12116 : long_fract_type_node;
12117 else if (specs->short_p)
12118 specs->type = specs->unsigned_p
12119 ? unsigned_short_fract_type_node
12120 : short_fract_type_node;
12122 specs->type = specs->unsigned_p
12123 ? unsigned_fract_type_node
12128 gcc_assert (!specs->complex_p);
12129 if (!targetm.fixed_point_supported_p ())
12130 specs->type = integer_type_node;
12131 else if (specs->saturating_p)
12133 if (specs->long_long_p)
12134 specs->type = specs->unsigned_p
12135 ? sat_unsigned_long_long_accum_type_node
12136 : sat_long_long_accum_type_node;
12137 else if (specs->long_p)
12138 specs->type = specs->unsigned_p
12139 ? sat_unsigned_long_accum_type_node
12140 : sat_long_accum_type_node;
12141 else if (specs->short_p)
12142 specs->type = specs->unsigned_p
12143 ? sat_unsigned_short_accum_type_node
12144 : sat_short_accum_type_node;
12146 specs->type = specs->unsigned_p
12147 ? sat_unsigned_accum_type_node
12148 : sat_accum_type_node;
12152 if (specs->long_long_p)
12153 specs->type = specs->unsigned_p
12154 ? unsigned_long_long_accum_type_node
12155 : long_long_accum_type_node;
12156 else if (specs->long_p)
12157 specs->type = specs->unsigned_p
12158 ? unsigned_long_accum_type_node
12159 : long_accum_type_node;
12160 else if (specs->short_p)
12161 specs->type = specs->unsigned_p
12162 ? unsigned_short_accum_type_node
12163 : short_accum_type_node;
12165 specs->type = specs->unsigned_p
12166 ? unsigned_accum_type_node
12171 gcc_unreachable ();
12173 handle_postfix_attrs:
12174 if (specs->type != NULL)
12176 specs->postfix_attrs = c_warn_type_attributes (specs->postfix_attrs);
12177 decl_attributes (&specs->type, specs->postfix_attrs, 0);
12178 specs->postfix_attrs = NULL_TREE;
12184 /* Perform final processing on one file scope's declarations (or the
12185 external scope's declarations), GLOBALS. */
12188 c_write_global_declarations_1 (tree globals)
12193 /* Process the decls in the order they were written. */
12194 for (decl = globals; decl; decl = DECL_CHAIN (decl))
12196 /* Check for used but undefined static functions using the C
12197 standard's definition of "used", and set TREE_NO_WARNING so
12198 that check_global_declaration doesn't repeat the check. */
12199 if (TREE_CODE (decl) == FUNCTION_DECL
12200 && DECL_INITIAL (decl) == NULL_TREE
12201 && DECL_EXTERNAL (decl)
12202 && !TREE_PUBLIC (decl))
12204 if (C_DECL_USED (decl))
12206 /* TODO: Add OPT_Wundefined-inline. */
12207 if (pedwarn (input_location, 0, "%q+F used but never defined",
12209 suppress_warning (decl /* OPT_Wundefined-inline. */);
12211 /* For -Wunused-function warn about unused static prototypes. */
12212 else if (warn_unused_function
12213 && ! DECL_ARTIFICIAL (decl)
12214 && ! warning_suppressed_p (decl, OPT_Wunused_function))
12216 if (warning (OPT_Wunused_function,
12217 "%q+F declared %<static%> but never defined",
12219 suppress_warning (decl, OPT_Wunused_function);
12223 wrapup_global_declaration_1 (decl);
12228 reconsider = false;
12229 for (decl = globals; decl; decl = DECL_CHAIN (decl))
12230 reconsider |= wrapup_global_declaration_2 (decl);
12232 while (reconsider);
12235 /* Preserve the external declarations scope across a garbage collect. */
12236 static GTY(()) tree ext_block;
12238 /* Collect all references relevant to SOURCE_FILE. */
12241 collect_all_refs (const char *source_file)
12246 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
12247 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file);
12249 collect_ada_nodes (BLOCK_VARS (ext_block), source_file);
12252 /* Collect source file references at global level. */
12255 collect_source_refs (void)
12262 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
12264 decls = DECL_INITIAL (t);
12265 for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl))
12266 if (!DECL_IS_UNDECLARED_BUILTIN (decl))
12267 collect_source_ref (DECL_SOURCE_FILE (decl));
12270 for (decl = BLOCK_VARS (ext_block); decl; decl = TREE_CHAIN (decl))
12271 if (!DECL_IS_UNDECLARED_BUILTIN (decl))
12272 collect_source_ref (DECL_SOURCE_FILE (decl));
12275 /* Free attribute access data that are not needed by the middle end. */
12278 free_attr_access_data ()
12280 struct cgraph_node *n;
12282 /* Iterate over all functions declared in the translation unit. */
12283 FOR_EACH_FUNCTION (n)
12285 for (tree parm = DECL_ARGUMENTS (n->decl); parm; parm = TREE_CHAIN (parm))
12286 if (tree attrs = DECL_ATTRIBUTES (parm))
12287 attr_access::free_lang_data (attrs);
12289 tree fntype = TREE_TYPE (n->decl);
12290 if (!fntype || fntype == error_mark_node)
12292 tree attrs = TYPE_ATTRIBUTES (fntype);
12296 attr_access::free_lang_data (attrs);
12300 /* Perform any final parser cleanups and generate initial debugging
12304 c_parse_final_cleanups (void)
12309 /* We don't want to do this if generating a PCH. */
12313 timevar_stop (TV_PHASE_PARSING);
12314 timevar_start (TV_PHASE_DEFERRED);
12316 /* Do the Objective-C stuff. This is where all the Objective-C
12317 module stuff gets generated (symtab, class/protocol/selector
12319 if (c_dialect_objc ())
12320 objc_write_global_declarations ();
12322 /* Close the external scope. */
12323 ext_block = pop_scope ();
12324 external_scope = 0;
12325 gcc_assert (!current_scope);
12327 /* Handle -fdump-ada-spec[-slim]. */
12328 if (flag_dump_ada_spec || flag_dump_ada_spec_slim)
12330 /* Build a table of files to generate specs for */
12331 collect_source_ref (main_input_filename);
12332 if (!flag_dump_ada_spec_slim)
12333 collect_source_refs ();
12335 dump_ada_specs (collect_all_refs, NULL);
12338 /* Process all file scopes in this compilation, and the external_scope,
12339 through wrapup_global_declarations. */
12340 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
12341 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
12342 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
12345 free_attr_access_data ();
12347 timevar_stop (TV_PHASE_DEFERRED);
12348 timevar_start (TV_PHASE_PARSING);
12353 /* Register reserved keyword WORD as qualifier for address space AS. */
12356 c_register_addr_space (const char *word, addr_space_t as)
12358 int rid = RID_FIRST_ADDR_SPACE + as;
12361 /* Address space qualifiers are only supported
12362 in C with GNU extensions enabled. */
12363 if (c_dialect_objc () || flag_no_asm)
12366 id = get_identifier (word);
12367 C_SET_RID_CODE (id, rid);
12368 C_IS_RESERVED_WORD (id) = 1;
12369 ridpointers [rid] = id;
12372 /* Return identifier to look up for omp declare reduction. */
12375 c_omp_reduction_id (enum tree_code reduction_code, tree reduction_id)
12377 const char *p = NULL;
12378 switch (reduction_code)
12380 case PLUS_EXPR: p = "+"; break;
12381 case MULT_EXPR: p = "*"; break;
12382 case MINUS_EXPR: p = "-"; break;
12383 case BIT_AND_EXPR: p = "&"; break;
12384 case BIT_XOR_EXPR: p = "^"; break;
12385 case BIT_IOR_EXPR: p = "|"; break;
12386 case TRUTH_ANDIF_EXPR: p = "&&"; break;
12387 case TRUTH_ORIF_EXPR: p = "||"; break;
12388 case MIN_EXPR: p = "min"; break;
12389 case MAX_EXPR: p = "max"; break;
12396 if (TREE_CODE (reduction_id) != IDENTIFIER_NODE)
12397 return error_mark_node;
12398 p = IDENTIFIER_POINTER (reduction_id);
12401 const char prefix[] = "omp declare reduction ";
12402 size_t lenp = sizeof (prefix);
12403 size_t len = strlen (p);
12404 char *name = XALLOCAVEC (char, lenp + len);
12405 memcpy (name, prefix, lenp - 1);
12406 memcpy (name + lenp - 1, p, len + 1);
12407 return get_identifier (name);
12410 /* Lookup REDUCTION_ID in the current scope, or create an artificial
12411 VAR_DECL, bind it into the current scope and return it. */
12414 c_omp_reduction_decl (tree reduction_id)
12416 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
12417 if (b != NULL && B_IN_CURRENT_SCOPE (b))
12420 tree decl = build_decl (BUILTINS_LOCATION, VAR_DECL,
12421 reduction_id, integer_type_node);
12422 DECL_ARTIFICIAL (decl) = 1;
12423 DECL_EXTERNAL (decl) = 1;
12424 TREE_STATIC (decl) = 1;
12425 TREE_PUBLIC (decl) = 0;
12426 bind (reduction_id, decl, current_scope, true, false, BUILTINS_LOCATION);
12430 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
12433 c_omp_reduction_lookup (tree reduction_id, tree type)
12435 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
12439 for (t = DECL_INITIAL (b->decl); t; t = TREE_CHAIN (t))
12440 if (comptypes (TREE_PURPOSE (t), type))
12441 return TREE_VALUE (t);
12444 return error_mark_node;
12447 /* Helper function called via walk_tree, to diagnose invalid
12448 #pragma omp declare reduction combiners or initializers. */
12451 c_check_omp_declare_reduction_r (tree *tp, int *, void *data)
12453 tree *vars = (tree *) data;
12454 if (SSA_VAR_P (*tp)
12455 && !DECL_ARTIFICIAL (*tp)
12459 location_t loc = DECL_SOURCE_LOCATION (vars[0]);
12460 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars[0])), "omp_out") == 0)
12461 error_at (loc, "%<#pragma omp declare reduction%> combiner refers to "
12462 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
12465 error_at (loc, "%<#pragma omp declare reduction%> initializer refers "
12466 "to variable %qD which is not %<omp_priv%> nor "
12476 c_check_in_current_scope (tree decl)
12478 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (decl));
12479 return b != NULL && B_IN_CURRENT_SCOPE (b);
12482 #include "gt-c-c-decl.h"