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. */
5185 if (!poly_int_tree_p (TYPE_SIZE (TREE_TYPE (decl)))
5186 || C_DECL_VARIABLE_SIZE (decl))
5188 error ("variable-sized object may not be initialized");
5189 initialized = false;
5192 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
5194 error ("variable %qD has initializer but incomplete type", decl);
5195 initialized = false;
5197 else if (C_DECL_VARIABLE_SIZE (decl))
5199 /* Although C99 is unclear about whether incomplete arrays
5200 of VLAs themselves count as VLAs, it does not make
5201 sense to permit them to be initialized given that
5202 ordinary VLAs may not be initialized. */
5203 error ("variable-sized object may not be initialized");
5204 initialized = false;
5210 if (current_scope == file_scope)
5211 TREE_STATIC (decl) = 1;
5213 /* Tell 'pushdecl' this is an initialized decl
5214 even though we don't yet have the initializer expression.
5215 Also tell 'finish_decl' it may store the real initializer. */
5216 DECL_INITIAL (decl) = error_mark_node;
5219 /* If this is a function declaration, write a record describing it to the
5220 prototypes file (if requested). */
5222 if (TREE_CODE (decl) == FUNCTION_DECL)
5223 gen_aux_info_record (decl, 0, 0, prototype_p (TREE_TYPE (decl)));
5225 /* ANSI specifies that a tentative definition which is not merged with
5226 a non-tentative definition behaves exactly like a definition with an
5227 initializer equal to zero. (Section 3.7.2)
5229 -fno-common gives strict ANSI behavior, though this tends to break
5230 a large body of code that grew up without this rule.
5232 Thread-local variables are never common, since there's no entrenched
5233 body of code to break, and it allows more efficient variable references
5234 in the presence of dynamic linking. */
5238 && TREE_PUBLIC (decl)
5239 && !DECL_THREAD_LOCAL_P (decl)
5241 DECL_COMMON (decl) = 1;
5243 /* Set attributes here so if duplicate decl, will have proper attributes. */
5244 c_decl_attributes (&decl, attributes, 0);
5246 /* Handle gnu_inline attribute. */
5247 if (declspecs->inline_p
5248 && !flag_gnu89_inline
5249 && TREE_CODE (decl) == FUNCTION_DECL
5250 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
5251 || current_function_decl))
5253 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
5255 else if (declspecs->storage_class != csc_static)
5256 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
5259 if (TREE_CODE (decl) == FUNCTION_DECL
5260 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
5262 struct c_declarator *ce = declarator;
5264 if (ce->kind == cdk_pointer)
5265 ce = declarator->declarator;
5266 if (ce->kind == cdk_function)
5268 tree args = ce->u.arg_info->parms;
5269 for (; args; args = DECL_CHAIN (args))
5271 tree type = TREE_TYPE (args);
5272 if (type && INTEGRAL_TYPE_P (type)
5273 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5274 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
5279 if (TREE_CODE (decl) == FUNCTION_DECL
5280 && DECL_DECLARED_INLINE_P (decl)
5281 && DECL_UNINLINABLE (decl)
5282 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
5283 warning (OPT_Wattributes, "inline function %q+D given attribute %qs",
5286 /* C99 6.7.4p3: An inline definition of a function with external
5287 linkage shall not contain a definition of a modifiable object
5288 with static storage duration... */
5290 && current_scope != file_scope
5291 && TREE_STATIC (decl)
5292 && !TREE_READONLY (decl)
5293 && DECL_DECLARED_INLINE_P (current_function_decl)
5294 && DECL_EXTERNAL (current_function_decl))
5295 record_inline_static (input_location, current_function_decl,
5296 decl, csi_modifiable);
5298 if (c_dialect_objc ()
5299 && VAR_OR_FUNCTION_DECL_P (decl))
5300 objc_check_global_decl (decl);
5302 /* Add this decl to the current scope.
5303 TEM may equal DECL or it may be a previous decl of the same name. */
5304 tem = pushdecl (decl);
5306 if (initialized && DECL_EXTERNAL (tem))
5308 DECL_EXTERNAL (tem) = 0;
5309 TREE_STATIC (tem) = 1;
5315 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
5316 DECL or the non-array element type if DECL is an uninitialized array.
5317 If that type has a const member, diagnose this. */
5320 diagnose_uninitialized_cst_member (tree decl, tree type)
5323 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
5326 if (TREE_CODE (field) != FIELD_DECL)
5328 field_type = strip_array_types (TREE_TYPE (field));
5330 if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST)
5332 auto_diagnostic_group d;
5333 if (warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
5334 "uninitialized const member in %qT is invalid in C++",
5335 strip_array_types (TREE_TYPE (decl))))
5336 inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field);
5339 if (RECORD_OR_UNION_TYPE_P (field_type))
5340 diagnose_uninitialized_cst_member (decl, field_type);
5344 /* Finish processing of a declaration;
5345 install its initial value.
5346 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
5347 If the length of an array type is not known before,
5348 it must be determined now, from the initial value, or it is an error.
5350 INIT_LOC is the location of the initial value. */
5353 finish_decl (tree decl, location_t init_loc, tree init,
5354 tree origtype, tree asmspec_tree)
5357 bool was_incomplete = (DECL_SIZE (decl) == NULL_TREE);
5358 const char *asmspec = 0;
5360 /* If a name was specified, get the string. */
5361 if (VAR_OR_FUNCTION_DECL_P (decl)
5362 && DECL_FILE_SCOPE_P (decl))
5363 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5365 asmspec = TREE_STRING_POINTER (asmspec_tree);
5368 && TREE_STATIC (decl)
5369 && global_bindings_p ())
5370 /* So decl is a global variable. Record the types it uses
5371 so that we can decide later to emit debug info for them. */
5372 record_types_used_by_current_var_decl (decl);
5374 /* If `start_decl' didn't like having an initialization, ignore it now. */
5375 if (init != NULL_TREE && DECL_INITIAL (decl) == NULL_TREE)
5378 /* Don't crash if parm is initialized. */
5379 if (TREE_CODE (decl) == PARM_DECL)
5383 store_init_value (init_loc, decl, init, origtype);
5385 if (c_dialect_objc () && (VAR_OR_FUNCTION_DECL_P (decl)
5386 || TREE_CODE (decl) == FIELD_DECL))
5387 objc_check_decl (decl);
5389 type = TREE_TYPE (decl);
5391 /* Deduce size of array from initialization, if not already known.
5392 This is only needed for an initialization in the current scope;
5393 it must not be done for a file-scope initialization of a
5394 declaration with external linkage, redeclared in an inner scope
5395 with the outer declaration shadowed in an intermediate scope. */
5396 if (TREE_CODE (type) == ARRAY_TYPE
5397 && TYPE_DOMAIN (type) == NULL_TREE
5398 && TREE_CODE (decl) != TYPE_DECL
5399 && !(TREE_PUBLIC (decl) && current_scope != file_scope))
5402 = (TREE_STATIC (decl)
5403 /* Even if pedantic, an external linkage array
5404 may have incomplete type at first. */
5405 ? pedantic && !TREE_PUBLIC (decl)
5406 : !DECL_EXTERNAL (decl));
5408 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
5411 /* Get the completed type made by complete_array_type. */
5412 type = TREE_TYPE (decl);
5417 error ("initializer fails to determine size of %q+D", decl);
5422 error ("array size missing in %q+D", decl);
5426 error ("zero or negative size array %q+D", decl);
5430 /* For global variables, update the copy of the type that
5431 exists in the binding. */
5432 if (TREE_PUBLIC (decl))
5434 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
5435 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
5436 b_ext = b_ext->shadowed;
5437 if (b_ext && TREE_CODE (decl) == TREE_CODE (b_ext->decl))
5439 if (b_ext->u.type && comptypes (b_ext->u.type, type))
5440 b_ext->u.type = composite_type (b_ext->u.type, type);
5442 b_ext->u.type = type;
5451 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
5452 TREE_TYPE (DECL_INITIAL (decl)) = type;
5454 relayout_decl (decl);
5457 /* Look for braced array initializers for character arrays and
5458 recursively convert them into STRING_CSTs. */
5459 if (tree init = DECL_INITIAL (decl))
5460 DECL_INITIAL (decl) = braced_lists_to_strings (type, init);
5464 if (init && TREE_CODE (init) == CONSTRUCTOR)
5465 add_flexible_array_elts_to_size (decl, init);
5467 complete_flexible_array_elts (DECL_INITIAL (decl));
5469 if (is_global_var (decl))
5471 type_context_kind context = (DECL_THREAD_LOCAL_P (decl)
5472 ? TCTX_THREAD_STORAGE
5473 : TCTX_STATIC_STORAGE);
5474 if (!verify_type_context (input_location, context, TREE_TYPE (decl)))
5475 TREE_TYPE (decl) = error_mark_node;
5478 if (DECL_SIZE (decl) == NULL_TREE && TREE_TYPE (decl) != error_mark_node
5479 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
5480 layout_decl (decl, 0);
5482 if (DECL_SIZE (decl) == NULL_TREE
5483 /* Don't give an error if we already gave one earlier. */
5484 && TREE_TYPE (decl) != error_mark_node
5485 && (TREE_STATIC (decl)
5486 /* A static variable with an incomplete type
5487 is an error if it is initialized.
5488 Also if it is not file scope.
5489 Otherwise, let it through, but if it is not `extern'
5490 then it may cause an error message later. */
5491 ? (DECL_INITIAL (decl) != NULL_TREE
5492 || !DECL_FILE_SCOPE_P (decl))
5493 /* An automatic variable with an incomplete type
5495 : !DECL_EXTERNAL (decl)))
5497 error ("storage size of %q+D isn%'t known", decl);
5498 TREE_TYPE (decl) = error_mark_node;
5501 if ((RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl))
5502 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
5503 && DECL_SIZE (decl) == NULL_TREE
5504 && TREE_STATIC (decl))
5505 incomplete_record_decls.safe_push (decl);
5507 if (is_global_var (decl)
5508 && DECL_SIZE (decl) != NULL_TREE
5509 && TREE_TYPE (decl) != error_mark_node)
5511 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
5512 constant_expression_warning (DECL_SIZE (decl));
5515 error ("storage size of %q+D isn%'t constant", decl);
5516 TREE_TYPE (decl) = error_mark_node;
5520 if (TREE_USED (type))
5522 TREE_USED (decl) = 1;
5523 DECL_READ_P (decl) = 1;
5527 /* If this is a function and an assembler name is specified, reset DECL_RTL
5528 so we can give it its new name. Also, update builtin_decl if it
5529 was a normal built-in. */
5530 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
5532 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5533 set_builtin_user_assembler_name (decl, asmspec);
5534 set_user_assembler_name (decl, asmspec);
5537 /* If #pragma weak was used, mark the decl weak now. */
5538 maybe_apply_pragma_weak (decl);
5540 /* Output the assembler code and/or RTL code for variables and functions,
5541 unless the type is an undefined structure or union.
5542 If not, it will get done when the type is completed. */
5544 if (VAR_OR_FUNCTION_DECL_P (decl))
5546 /* Determine the ELF visibility. */
5547 if (TREE_PUBLIC (decl))
5548 c_determine_visibility (decl);
5550 /* This is a no-op in c-lang.cc or something real in objc-act.cc. */
5551 if (c_dialect_objc ())
5552 objc_check_decl (decl);
5556 /* If this is not a static variable, issue a warning.
5557 It doesn't make any sense to give an ASMSPEC for an
5558 ordinary, non-register local variable. Historically,
5559 GCC has accepted -- but ignored -- the ASMSPEC in
5561 if (!DECL_FILE_SCOPE_P (decl)
5563 && !C_DECL_REGISTER (decl)
5564 && !TREE_STATIC (decl))
5565 warning (0, "ignoring %<asm%> specifier for non-static local "
5566 "variable %q+D", decl);
5568 set_user_assembler_name (decl, asmspec);
5571 if (DECL_FILE_SCOPE_P (decl))
5573 if (DECL_INITIAL (decl) == NULL_TREE
5574 || DECL_INITIAL (decl) == error_mark_node)
5575 /* Don't output anything
5576 when a tentative file-scope definition is seen.
5577 But at end of compilation, do output code for them. */
5578 DECL_DEFER_OUTPUT (decl) = 1;
5579 if (asmspec && VAR_P (decl) && C_DECL_REGISTER (decl))
5580 DECL_HARD_REGISTER (decl) = 1;
5581 rest_of_decl_compilation (decl, true, 0);
5583 if (TREE_CODE (decl) == FUNCTION_DECL)
5585 tree parms = DECL_ARGUMENTS (decl);
5586 const bool builtin = fndecl_built_in_p (decl);
5587 if (tree access = build_attr_access_from_parms (parms, !builtin))
5588 decl_attributes (&decl, access, 0);
5593 /* In conjunction with an ASMSPEC, the `register'
5594 keyword indicates that we should place the variable
5595 in a particular register. */
5596 if (asmspec && C_DECL_REGISTER (decl))
5598 DECL_HARD_REGISTER (decl) = 1;
5599 /* This cannot be done for a structure with volatile
5600 fields, on which DECL_REGISTER will have been
5602 if (!DECL_REGISTER (decl))
5603 error ("cannot put object with volatile field into register");
5606 if (TREE_CODE (decl) != FUNCTION_DECL)
5608 /* If we're building a variable sized type, and we might be
5609 reachable other than via the top of the current binding
5610 level, then create a new BIND_EXPR so that we deallocate
5611 the object at the right time. */
5612 /* Note that DECL_SIZE can be null due to errors. */
5613 if (DECL_SIZE (decl)
5614 && !TREE_CONSTANT (DECL_SIZE (decl))
5615 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
5618 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
5619 TREE_SIDE_EFFECTS (bind) = 1;
5621 BIND_EXPR_BODY (bind) = push_stmt_list ();
5623 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
5629 if (!DECL_FILE_SCOPE_P (decl))
5631 /* Recompute the RTL of a local array now
5632 if it used to be an incomplete type. */
5633 if (was_incomplete && !is_global_var (decl))
5635 /* If we used it already as memory, it must stay in memory. */
5636 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5637 /* If it's still incomplete now, no init will save it. */
5638 if (DECL_SIZE (decl) == NULL_TREE)
5639 DECL_INITIAL (decl) = NULL_TREE;
5644 if (TREE_CODE (decl) == TYPE_DECL)
5646 if (!DECL_FILE_SCOPE_P (decl)
5647 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
5648 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
5650 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
5653 /* Install a cleanup (aka destructor) if one was given. */
5654 if (VAR_P (decl) && !TREE_STATIC (decl))
5656 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
5659 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
5660 tree cleanup_decl = lookup_name (cleanup_id);
5662 vec<tree, va_gc> *v;
5664 /* Build "cleanup(&decl)" for the destructor. */
5665 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, false);
5667 v->quick_push (cleanup);
5668 cleanup = c_build_function_call_vec (DECL_SOURCE_LOCATION (decl),
5669 vNULL, cleanup_decl, v, NULL);
5672 /* Don't warn about decl unused; the cleanup uses it. */
5673 TREE_USED (decl) = 1;
5674 TREE_USED (cleanup_decl) = 1;
5675 DECL_READ_P (decl) = 1;
5677 push_cleanup (decl, cleanup, false);
5683 && !DECL_EXTERNAL (decl)
5684 && DECL_INITIAL (decl) == NULL_TREE)
5686 type = strip_array_types (type);
5687 if (TREE_READONLY (decl))
5688 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
5689 "uninitialized %<const %D%> is invalid in C++", decl);
5690 else if (RECORD_OR_UNION_TYPE_P (type)
5691 && C_TYPE_FIELDS_READONLY (type))
5692 diagnose_uninitialized_cst_member (decl, type);
5697 && lookup_attribute ("omp declare target implicit",
5698 DECL_ATTRIBUTES (decl)))
5700 DECL_ATTRIBUTES (decl)
5701 = remove_attribute ("omp declare target implicit",
5702 DECL_ATTRIBUTES (decl));
5703 if (!omp_mappable_type (TREE_TYPE (decl)))
5704 error ("%q+D in declare target directive does not have mappable type",
5706 else if (!lookup_attribute ("omp declare target",
5707 DECL_ATTRIBUTES (decl))
5708 && !lookup_attribute ("omp declare target link",
5709 DECL_ATTRIBUTES (decl)))
5711 DECL_ATTRIBUTES (decl)
5712 = tree_cons (get_identifier ("omp declare target"),
5713 NULL_TREE, DECL_ATTRIBUTES (decl));
5714 symtab_node *node = symtab_node::get (decl);
5717 node->offloadable = 1;
5718 if (ENABLE_OFFLOADING)
5720 g->have_offload = true;
5721 if (is_a <varpool_node *> (node))
5722 vec_safe_push (offload_vars, decl);
5728 /* This is the last point we can lower alignment so give the target the
5731 && !is_global_var (decl)
5732 && !DECL_HARD_REGISTER (decl))
5733 targetm.lower_local_decl_alignment (decl);
5735 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
5738 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
5739 EXPR is NULL or a pointer to an expression that needs to be
5740 evaluated for the side effects of array size expressions in the
5744 grokparm (const struct c_parm *parm, tree *expr)
5746 tree attrs = parm->attrs;
5747 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
5748 NULL, &attrs, expr, NULL, DEPRECATED_NORMAL);
5750 decl_attributes (&decl, attrs, 0);
5755 /* Return attribute "arg spec" corresponding to an array/VLA parameter
5756 described by PARM, concatenated onto attributes ATTRS.
5757 The spec consists of one dollar symbol for each specified variable
5758 bound, one asterisk for each unspecified variable bound, followed
5759 by at most one specification of the most significant bound of
5760 an ordinary array parameter. For ordinary arrays the specification
5761 is either the constant bound itself, or the space character for
5762 an array with an unspecified bound (the [] form). Finally, a chain
5763 of specified variable bounds is appended to the spec, starting with
5764 the most significant bound. For example, the PARM T a[2][m][3][n]
5765 will produce __attribute__((arg spec ("[$$2]", m, n)).
5766 For T a typedef for an array with variable bounds, the bounds are
5767 included in the specification in the expected order.
5768 No "arg spec" is created for parameters of pointer types, making
5769 a distinction between T(*)[N] (or, equivalently, T[][N]) and
5770 the T[M][N] form, all of which have the same type and are represented
5771 the same, but only the last of which gets an "arg spec" describing
5772 the most significant bound M. */
5775 get_parm_array_spec (const struct c_parm *parm, tree attrs)
5777 /* The attribute specification string, minor bound first. */
5780 /* A list of VLA variable bounds, major first, or null if unspecified
5782 tree vbchain = NULL_TREE;
5783 /* True for a pointer parameter. */
5784 bool pointer = false;
5785 /* True for an ordinary array with an unpecified bound. */
5786 bool nobound = false;
5788 /* Create a string representation for the bounds of the array/VLA. */
5789 for (c_declarator *pd = parm->declarator, *next; pd; pd = next)
5791 next = pd->declarator;
5792 while (next && next->kind == cdk_attrs)
5793 next = next->declarator;
5795 /* Remember if a pointer has been seen to avoid storing the constant
5797 if (pd->kind == cdk_pointer)
5800 if ((pd->kind == cdk_pointer || pd->kind == cdk_function)
5801 && (!next || next->kind == cdk_id))
5803 /* Do nothing for the common case of a pointer. The fact that
5804 the parameter is one can be deduced from the absence of
5805 an arg spec for it. */
5809 if (pd->kind == cdk_id)
5812 || !parm->specs->type
5813 || TREE_CODE (parm->specs->type) != ARRAY_TYPE
5814 || !TYPE_DOMAIN (parm->specs->type)
5815 || !TYPE_MAX_VALUE (TYPE_DOMAIN (parm->specs->type)))
5818 tree max = TYPE_MAX_VALUE (TYPE_DOMAIN (parm->specs->type));
5820 && TREE_CODE (max) == INTEGER_CST)
5822 /* Extract the upper bound from a parameter of an array type
5823 unless the parameter is an ordinary array of unspecified
5824 bound in which case a next iteration of the loop will
5826 if (spec.empty () || spec.end ()[-1] != ' ')
5828 if (!tree_fits_shwi_p (max))
5831 /* The upper bound is the value of the largest valid
5833 HOST_WIDE_INT n = tree_to_shwi (max) + 1;
5835 sprintf (buf, "%lu", (unsigned long)n);
5841 /* For a VLA typedef, create a list of its variable bounds and
5842 append it in the expected order to VBCHAIN. */
5843 tree tpbnds = NULL_TREE;
5844 for (tree type = parm->specs->type; TREE_CODE (type) == ARRAY_TYPE;
5845 type = TREE_TYPE (type))
5847 tree nelts = array_type_nelts (type);
5848 if (error_operand_p (nelts))
5850 if (TREE_CODE (nelts) != INTEGER_CST)
5852 /* Each variable VLA bound is represented by the dollar
5855 tpbnds = tree_cons (NULL_TREE, nelts, tpbnds);
5858 tpbnds = nreverse (tpbnds);
5859 vbchain = chainon (vbchain, tpbnds);
5863 if (pd->kind != cdk_array)
5866 if (pd->u.array.vla_unspec_p)
5868 /* Each unspecified bound is represented by a star. There
5869 can be any number of these in a declaration (but none in
5875 tree nelts = pd->u.array.dimen;
5878 /* Ordinary array of unspecified size. There can be at most
5879 one for the most significant bound. Exit on the next
5880 iteration which determines whether or not PARM is declared
5881 as a pointer or an array. */
5886 if (pd->u.array.static_p)
5889 if (!INTEGRAL_TYPE_P (TREE_TYPE (nelts)))
5890 /* Avoid invalid NELTS. */
5894 nelts = c_fully_fold (nelts, false, nullptr);
5895 if (TREE_CODE (nelts) == INTEGER_CST)
5897 /* Skip all constant bounds except the most significant one.
5898 The interior ones are included in the array type. */
5899 if (next && (next->kind == cdk_array || next->kind == cdk_pointer))
5902 if (!tree_fits_uhwi_p (nelts))
5903 /* Bail completely on invalid bounds. */
5907 unsigned HOST_WIDE_INT n = tree_to_uhwi (nelts);
5908 sprintf (buf, "%llu", (unsigned long long)n);
5913 /* Each variable VLA bound is represented by a dollar sign. */
5915 vbchain = tree_cons (NULL_TREE, nelts, vbchain);
5918 if (spec.empty () && !nobound)
5921 spec.insert (0, "[");
5923 /* Ordinary array of unspecified bound is represented by a space.
5924 It must be last in the spec. */
5928 tree acsstr = build_string (spec.length () + 1, spec.c_str ());
5929 tree args = tree_cons (NULL_TREE, acsstr, vbchain);
5930 tree name = get_identifier ("arg spec");
5931 return tree_cons (name, args, attrs);
5934 /* Given a parsed parameter declaration, decode it into a PARM_DECL
5935 and push that on the current scope. EXPR is a pointer to an
5936 expression that needs to be evaluated for the side effects of array
5937 size expressions in the parameters. */
5940 push_parm_decl (const struct c_parm *parm, tree *expr)
5942 tree attrs = parm->attrs;
5943 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
5944 &attrs, expr, NULL, DEPRECATED_NORMAL);
5945 if (decl && DECL_P (decl))
5946 DECL_SOURCE_LOCATION (decl) = parm->loc;
5948 attrs = get_parm_array_spec (parm, attrs);
5949 decl_attributes (&decl, attrs, 0);
5951 decl = pushdecl (decl);
5953 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
5956 /* Mark all the parameter declarations to date as forward decls.
5957 Also diagnose use of this extension. */
5960 mark_forward_parm_decls (void)
5962 struct c_binding *b;
5964 if (pedantic && !current_scope->warned_forward_parm_decls)
5966 pedwarn (input_location, OPT_Wpedantic,
5967 "ISO C forbids forward parameter declarations");
5968 current_scope->warned_forward_parm_decls = true;
5971 for (b = current_scope->bindings; b; b = b->prev)
5972 if (TREE_CODE (b->decl) == PARM_DECL)
5973 TREE_ASM_WRITTEN (b->decl) = 1;
5976 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5977 literal, which may be an incomplete array type completed by the
5978 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5979 literal. NON_CONST is true if the initializers contain something
5980 that cannot occur in a constant expression. If ALIGNAS_ALIGN is nonzero,
5981 it is the (valid) alignment for this compound literal, as specified
5985 build_compound_literal (location_t loc, tree type, tree init, bool non_const,
5986 unsigned int alignas_align)
5988 /* We do not use start_decl here because we have a type, not a declarator;
5989 and do not use finish_decl because the decl should be stored inside
5990 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5995 if (type == error_mark_node
5996 || init == error_mark_node)
5997 return error_mark_node;
5999 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
6000 DECL_EXTERNAL (decl) = 0;
6001 TREE_PUBLIC (decl) = 0;
6002 TREE_STATIC (decl) = (current_scope == file_scope);
6003 DECL_CONTEXT (decl) = current_function_decl;
6004 TREE_USED (decl) = 1;
6005 DECL_READ_P (decl) = 1;
6006 DECL_ARTIFICIAL (decl) = 1;
6007 DECL_IGNORED_P (decl) = 1;
6008 C_DECL_COMPOUND_LITERAL_P (decl) = 1;
6009 TREE_TYPE (decl) = type;
6010 c_apply_type_quals_to_decl (TYPE_QUALS (strip_array_types (type)), decl);
6013 SET_DECL_ALIGN (decl, alignas_align * BITS_PER_UNIT);
6014 DECL_USER_ALIGN (decl) = 1;
6016 store_init_value (loc, decl, init, NULL_TREE);
6018 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
6020 int failure = complete_array_type (&TREE_TYPE (decl),
6021 DECL_INITIAL (decl), true);
6022 /* If complete_array_type returns 3, it means that the
6023 initial value of the compound literal is empty. Allow it. */
6024 gcc_assert (failure == 0 || failure == 3);
6026 type = TREE_TYPE (decl);
6027 TREE_TYPE (DECL_INITIAL (decl)) = type;
6030 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
6032 c_incomplete_type_error (loc, NULL_TREE, type);
6033 return error_mark_node;
6036 if (TREE_STATIC (decl)
6037 && !verify_type_context (loc, TCTX_STATIC_STORAGE, type))
6038 return error_mark_node;
6040 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
6041 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
6042 TREE_SIDE_EFFECTS (complit) = 1;
6044 layout_decl (decl, 0);
6046 if (TREE_STATIC (decl))
6048 /* This decl needs a name for the assembler output. */
6049 set_compound_literal_name (decl);
6050 DECL_DEFER_OUTPUT (decl) = 1;
6051 DECL_COMDAT (decl) = 1;
6053 rest_of_decl_compilation (decl, 1, 0);
6055 else if (current_function_decl && !current_scope->parm_flag)
6060 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
6061 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
6067 /* Check the type of a compound literal. Here we just check that it
6068 is valid for C++. */
6071 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
6074 && (type_name->specs->typespec_kind == ctsk_tagdef
6075 || type_name->specs->typespec_kind == ctsk_tagfirstref
6076 || type_name->specs->typespec_kind == ctsk_tagfirstref_attrs))
6077 warning_at (loc, OPT_Wc___compat,
6078 "defining a type in a compound literal is invalid in C++");
6081 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
6082 replacing with appropriate values if they are invalid. */
6085 check_bitfield_type_and_width (location_t loc, tree *type, tree *width,
6089 unsigned int max_width;
6090 unsigned HOST_WIDE_INT w;
6091 const char *name = (orig_name
6092 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
6093 : _("<anonymous>"));
6095 /* Detect and ignore out of range field width and process valid
6097 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)))
6099 error_at (loc, "bit-field %qs width not an integer constant", name);
6100 *width = integer_one_node;
6104 if (TREE_CODE (*width) != INTEGER_CST)
6106 *width = c_fully_fold (*width, false, NULL);
6107 if (TREE_CODE (*width) == INTEGER_CST)
6108 pedwarn (loc, OPT_Wpedantic,
6109 "bit-field %qs width not an integer constant expression",
6112 if (TREE_CODE (*width) != INTEGER_CST)
6114 error_at (loc, "bit-field %qs width not an integer constant", name);
6115 *width = integer_one_node;
6117 constant_expression_warning (*width);
6118 if (tree_int_cst_sgn (*width) < 0)
6120 error_at (loc, "negative width in bit-field %qs", name);
6121 *width = integer_one_node;
6123 else if (integer_zerop (*width) && orig_name)
6125 error_at (loc, "zero width for bit-field %qs", name);
6126 *width = integer_one_node;
6130 /* Detect invalid bit-field type. */
6131 if (TREE_CODE (*type) != INTEGER_TYPE
6132 && TREE_CODE (*type) != BOOLEAN_TYPE
6133 && TREE_CODE (*type) != ENUMERAL_TYPE)
6135 error_at (loc, "bit-field %qs has invalid type", name);
6136 *type = unsigned_type_node;
6139 if (TYPE_WARN_IF_NOT_ALIGN (*type))
6141 error_at (loc, "cannot declare bit-field %qs with %<warn_if_not_aligned%> type",
6143 *type = unsigned_type_node;
6146 type_mv = TYPE_MAIN_VARIANT (*type);
6147 if (!in_system_header_at (input_location)
6148 && type_mv != integer_type_node
6149 && type_mv != unsigned_type_node
6150 && type_mv != boolean_type_node)
6151 pedwarn_c90 (loc, OPT_Wpedantic,
6152 "type of bit-field %qs is a GCC extension", name);
6154 max_width = TYPE_PRECISION (*type);
6156 if (compare_tree_int (*width, max_width) > 0)
6158 error_at (loc, "width of %qs exceeds its type", name);
6160 *width = build_int_cst (integer_type_node, w);
6163 w = tree_to_uhwi (*width);
6165 if (TREE_CODE (*type) == ENUMERAL_TYPE)
6167 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
6169 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_SIGN (*type))
6170 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_SIGN (*type)))
6171 warning_at (loc, 0, "%qs is narrower than values of its type", name);
6177 /* Print warning about variable length array if necessary. */
6180 warn_variable_length_array (tree name, tree size)
6182 if (TREE_CONSTANT (size))
6185 pedwarn_c90 (input_location, OPT_Wvla,
6186 "ISO C90 forbids array %qE whose size "
6187 "cannot be evaluated", name);
6189 pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids array "
6190 "whose size cannot be evaluated");
6195 pedwarn_c90 (input_location, OPT_Wvla,
6196 "ISO C90 forbids variable length array %qE", name);
6198 pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids variable "
6203 /* Print warning about defaulting to int if necessary. */
6206 warn_defaults_to (location_t location, int opt, const char *gmsgid, ...)
6208 diagnostic_info diagnostic;
6210 rich_location richloc (line_table, location);
6212 va_start (ap, gmsgid);
6213 diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
6214 flag_isoc99 ? DK_PEDWARN : DK_WARNING);
6215 diagnostic.option_index = opt;
6216 diagnostic_report_diagnostic (global_dc, &diagnostic);
6220 /* Returns the smallest location != UNKNOWN_LOCATION in LOCATIONS,
6221 considering only those c_declspec_words found in LIST, which
6222 must be terminated by cdw_number_of_elements. */
6225 smallest_type_quals_location (const location_t *locations,
6226 const c_declspec_word *list)
6228 location_t loc = UNKNOWN_LOCATION;
6229 while (*list != cdw_number_of_elements)
6231 location_t newloc = locations[*list];
6232 if (loc == UNKNOWN_LOCATION
6233 || (newloc != UNKNOWN_LOCATION && newloc < loc))
6241 /* Given declspecs and a declarator,
6242 determine the name and type of the object declared
6243 and construct a ..._DECL node for it.
6244 (In one case we can return a ..._TYPE node instead.
6245 For invalid input we sometimes return NULL_TREE.)
6247 DECLSPECS is a c_declspecs structure for the declaration specifiers.
6249 DECL_CONTEXT says which syntactic context this declaration is in:
6250 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6251 FUNCDEF for a function definition. Like NORMAL but a few different
6252 error messages in each case. Return value may be zero meaning
6253 this definition is too screwy to try to parse.
6254 PARM for a parameter declaration (either within a function prototype
6255 or before a function body). Make a PARM_DECL, or return void_type_node.
6256 TYPENAME if for a typename (in a cast or sizeof).
6257 Don't make a DECL node; just return the ..._TYPE node.
6258 FIELD for a struct or union field; make a FIELD_DECL.
6259 INITIALIZED is true if the decl has an initializer.
6260 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
6261 representing the width of the bit-field.
6262 DECL_ATTRS points to the list of attributes that should be added to this
6263 decl. Any nested attributes that belong on the decl itself will be
6265 If EXPR is not NULL, any expressions that need to be evaluated as
6266 part of evaluating variably modified types will be stored in *EXPR.
6267 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
6268 set to indicate whether operands in *EXPR can be used in constant
6270 DEPRECATED_STATE is a deprecated_states value indicating whether
6271 deprecation/unavailability warnings should be suppressed.
6273 In the TYPENAME case, DECLARATOR is really an absolute declarator.
6274 It may also be so in the PARM case, for a prototype where the
6275 argument type is specified but not the name.
6277 This function is where the complicated C meanings of `static'
6278 and `extern' are interpreted. */
6281 grokdeclarator (const struct c_declarator *declarator,
6282 struct c_declspecs *declspecs,
6283 enum decl_context decl_context, bool initialized, tree *width,
6284 tree *decl_attrs, tree *expr, bool *expr_const_operands,
6285 enum deprecated_states deprecated_state)
6287 tree type = declspecs->type;
6288 bool threadp = declspecs->thread_p;
6289 enum c_storage_class storage_class = declspecs->storage_class;
6294 int type_quals = TYPE_UNQUALIFIED;
6295 tree name = NULL_TREE;
6296 bool funcdef_flag = false;
6297 bool funcdef_syntax = false;
6298 bool size_varies = false;
6299 tree decl_attr = declspecs->decl_attr;
6300 int array_ptr_quals = TYPE_UNQUALIFIED;
6301 tree array_ptr_attrs = NULL_TREE;
6302 bool array_parm_static = false;
6303 bool array_parm_vla_unspec_p = false;
6304 tree returned_attrs = NULL_TREE;
6305 tree decl_id_attrs = NULL_TREE;
6306 bool bitfield = width != NULL;
6308 tree orig_qual_type = NULL;
6309 size_t orig_qual_indirect = 0;
6310 struct c_arg_info *arg_info = 0;
6311 addr_space_t as1, as2, address_space;
6312 location_t loc = UNKNOWN_LOCATION;
6314 bool expr_const_operands_dummy;
6315 enum c_declarator_kind first_non_attr_kind;
6316 unsigned int alignas_align = 0;
6318 if (TREE_CODE (type) == ERROR_MARK)
6319 return error_mark_node;
6323 expr_dummy = NULL_TREE;
6325 if (expr_const_operands == NULL)
6326 expr_const_operands = &expr_const_operands_dummy;
6328 if (declspecs->expr)
6331 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (declspecs->expr), *expr,
6334 *expr = declspecs->expr;
6336 *expr_const_operands = declspecs->expr_const_operands;
6338 if (decl_context == FUNCDEF)
6339 funcdef_flag = true, decl_context = NORMAL;
6341 /* Look inside a declarator for the name being declared
6342 and get it as an IDENTIFIER_NODE, for an error message. */
6344 const struct c_declarator *decl = declarator;
6346 first_non_attr_kind = cdk_attrs;
6356 funcdef_syntax = (decl->kind == cdk_function);
6357 if (first_non_attr_kind == cdk_attrs)
6358 first_non_attr_kind = decl->kind;
6359 decl = decl->declarator;
6363 decl = decl->declarator;
6369 name = decl->u.id.id;
6370 decl_id_attrs = decl->u.id.attrs;
6371 if (first_non_attr_kind == cdk_attrs)
6372 first_non_attr_kind = decl->kind;
6379 if (name == NULL_TREE)
6381 gcc_assert (decl_context == PARM
6382 || decl_context == TYPENAME
6383 || (decl_context == FIELD
6384 && declarator->kind == cdk_id));
6385 gcc_assert (!initialized);
6389 /* A function definition's declarator must have the form of
6390 a function declarator. */
6392 if (funcdef_flag && !funcdef_syntax)
6395 /* If this looks like a function definition, make it one,
6396 even if it occurs where parms are expected.
6397 Then store_parm_decls will reject it and not use it as a parm. */
6398 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
6399 decl_context = PARM;
6401 if (deprecated_state != UNAVAILABLE_DEPRECATED_SUPPRESS)
6403 if (declspecs->unavailable_p)
6404 error_unavailable_use (declspecs->type, declspecs->decl_attr);
6405 else if (declspecs->deprecated_p
6406 && deprecated_state != DEPRECATED_SUPPRESS)
6407 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
6410 if ((decl_context == NORMAL || decl_context == FIELD)
6411 && current_scope == file_scope
6412 && variably_modified_type_p (type, NULL_TREE))
6415 error_at (loc, "variably modified %qE at file scope", name);
6417 error_at (loc, "variably modified field at file scope");
6418 type = integer_type_node;
6421 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
6423 /* Diagnose defaulting to "int". */
6425 if (declspecs->default_int_p && !in_system_header_at (input_location))
6427 /* Issue a warning if this is an ISO C 99 program or if
6428 -Wreturn-type and this is a function, or if -Wimplicit;
6429 prefer the former warning since it is more explicit. */
6430 if ((warn_implicit_int || warn_return_type > 0 || flag_isoc99)
6432 warn_about_return_type = 1;
6436 warn_defaults_to (loc, OPT_Wimplicit_int,
6437 "type defaults to %<int%> in declaration "
6440 warn_defaults_to (loc, OPT_Wimplicit_int,
6441 "type defaults to %<int%> in type name");
6445 /* Adjust the type if a bit-field is being declared,
6446 -funsigned-bitfields applied and the type is not explicitly
6448 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
6449 && TREE_CODE (type) == INTEGER_TYPE)
6450 type = unsigned_type_for (type);
6452 /* Figure out the type qualifiers for the declaration. There are
6453 two ways a declaration can become qualified. One is something
6454 like `const int i' where the `const' is explicit. Another is
6455 something like `typedef const int CI; CI i' where the type of the
6456 declaration contains the `const'. A third possibility is that
6457 there is a type qualifier on the element type of a typedefed
6458 array type, in which case we should extract that qualifier so
6459 that c_apply_type_quals_to_decl receives the full list of
6460 qualifiers to work with (C90 is not entirely clear about whether
6461 duplicate qualifiers should be diagnosed in this case, but it
6462 seems most appropriate to do so). */
6463 element_type = strip_array_types (type);
6464 constp = declspecs->const_p + TYPE_READONLY (element_type);
6465 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
6466 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
6467 atomicp = declspecs->atomic_p + TYPE_ATOMIC (element_type);
6468 as1 = declspecs->address_space;
6469 as2 = TYPE_ADDR_SPACE (element_type);
6470 address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1;
6473 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<const%>");
6475 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<restrict%>");
6477 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<volatile%>");
6479 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<_Atomic%>");
6481 if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2)
6482 error_at (loc, "conflicting named address spaces (%s vs %s)",
6483 c_addr_space_name (as1), c_addr_space_name (as2));
6485 if ((TREE_CODE (type) == ARRAY_TYPE
6486 || first_non_attr_kind == cdk_array)
6487 && TYPE_QUALS (element_type))
6489 orig_qual_type = type;
6490 type = TYPE_MAIN_VARIANT (type);
6492 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
6493 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
6494 | (volatilep ? TYPE_QUAL_VOLATILE : 0)
6495 | (atomicp ? TYPE_QUAL_ATOMIC : 0)
6496 | ENCODE_QUAL_ADDR_SPACE (address_space));
6497 if (type_quals != TYPE_QUALS (element_type))
6498 orig_qual_type = NULL_TREE;
6500 /* Applying the _Atomic qualifier to an array type (through the use
6501 of typedefs or typeof) must be detected here. If the qualifier
6502 is introduced later, any appearance of applying it to an array is
6503 actually applying it to an element of that array. */
6504 if (declspecs->atomic_p && TREE_CODE (type) == ARRAY_TYPE)
6505 error_at (loc, "%<_Atomic%>-qualified array type");
6507 /* Warn about storage classes that are invalid for certain
6508 kinds of declarations (parameters, typenames, etc.). */
6512 || storage_class == csc_auto
6513 || storage_class == csc_register
6514 || storage_class == csc_typedef))
6516 if (storage_class == csc_auto)
6518 (current_scope == file_scope) ? 0 : OPT_Wpedantic,
6519 "function definition declared %<auto%>");
6520 if (storage_class == csc_register)
6521 error_at (loc, "function definition declared %<register%>");
6522 if (storage_class == csc_typedef)
6523 error_at (loc, "function definition declared %<typedef%>");
6525 error_at (loc, "function definition declared %qs",
6526 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
6528 if (storage_class == csc_auto
6529 || storage_class == csc_register
6530 || storage_class == csc_typedef)
6531 storage_class = csc_none;
6533 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
6535 if (decl_context == PARM && storage_class == csc_register)
6539 switch (decl_context)
6543 error_at (loc, "storage class specified for structure "
6546 error_at (loc, "storage class specified for structure field");
6550 error_at (loc, "storage class specified for parameter %qE",
6553 error_at (loc, "storage class specified for unnamed parameter");
6556 error_at (loc, "storage class specified for typename");
6559 storage_class = csc_none;
6563 else if (storage_class == csc_extern
6567 /* 'extern' with initialization is invalid if not at file scope. */
6568 if (current_scope == file_scope)
6570 /* It is fine to have 'extern const' when compiling at C
6571 and C++ intersection. */
6572 if (!(warn_cxx_compat && constp))
6573 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
6577 error_at (loc, "%qE has both %<extern%> and initializer", name);
6579 else if (current_scope == file_scope)
6581 if (storage_class == csc_auto)
6582 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
6584 if (pedantic && storage_class == csc_register)
6585 pedwarn (input_location, OPT_Wpedantic,
6586 "file-scope declaration of %qE specifies %<register%>", name);
6590 if (storage_class == csc_extern && funcdef_flag)
6591 error_at (loc, "nested function %qE declared %<extern%>", name);
6592 else if (threadp && storage_class == csc_none)
6594 error_at (loc, "function-scope %qE implicitly auto and declared "
6596 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
6601 /* Now figure out the structure of the declarator proper.
6602 Descend through it, creating more complex types, until we reach
6603 the declared identifier (or NULL_TREE, in an absolute declarator).
6604 At each stage we maintain an unqualified version of the type
6605 together with any qualifiers that should be applied to it with
6606 c_build_qualified_type; this way, array types including
6607 multidimensional array types are first built up in unqualified
6608 form and then the qualified form is created with
6609 TYPE_MAIN_VARIANT pointing to the unqualified form. */
6611 while (declarator && declarator->kind != cdk_id)
6613 if (type == error_mark_node)
6615 declarator = declarator->declarator;
6619 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
6620 a cdk_pointer (for *...),
6621 a cdk_function (for ...(...)),
6622 a cdk_attrs (for nested attributes),
6623 or a cdk_id (for the name being declared
6624 or the place in an absolute declarator
6625 where the name was omitted).
6626 For the last case, we have just exited the loop.
6628 At this point, TYPE is the type of elements of an array,
6629 or for a function to return, or for a pointer to point to.
6630 After this sequence of ifs, TYPE is the type of the
6631 array or function or pointer, and DECLARATOR has had its
6632 outermost layer removed. */
6634 if (array_ptr_quals != TYPE_UNQUALIFIED
6635 || array_ptr_attrs != NULL_TREE
6636 || array_parm_static)
6638 /* Only the innermost declarator (making a parameter be of
6639 array type which is converted to pointer type)
6640 may have static or type qualifiers. */
6641 error_at (loc, "static or type qualifiers in non-parameter array declarator");
6642 array_ptr_quals = TYPE_UNQUALIFIED;
6643 array_ptr_attrs = NULL_TREE;
6644 array_parm_static = false;
6647 switch (declarator->kind)
6651 /* A declarator with embedded attributes. */
6652 tree attrs = declarator->u.attrs;
6653 const struct c_declarator *inner_decl;
6655 declarator = declarator->declarator;
6656 /* Standard attribute syntax precisely defines what entity
6657 an attribute in each position appertains to, so only
6658 apply laxity about positioning to GNU attribute syntax.
6659 Standard attributes applied to a function or array
6660 declarator apply exactly to that type; standard
6661 attributes applied to the identifier apply to the
6662 declaration rather than to the type, and are specified
6663 using a cdk_id declarator rather than using
6665 inner_decl = declarator;
6666 while (inner_decl->kind == cdk_attrs)
6667 inner_decl = inner_decl->declarator;
6668 if (!cxx11_attribute_p (attrs))
6670 if (inner_decl->kind == cdk_id)
6671 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
6672 else if (inner_decl->kind == cdk_function)
6673 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
6674 else if (inner_decl->kind == cdk_array)
6675 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
6677 attrs = c_warn_type_attributes (attrs);
6678 returned_attrs = decl_attributes (&type,
6679 chainon (returned_attrs, attrs),
6685 tree itype = NULL_TREE;
6686 tree size = declarator->u.array.dimen;
6687 /* The index is a signed object `sizetype' bits wide. */
6688 tree index_type = c_common_signed_type (sizetype);
6690 array_ptr_quals = declarator->u.array.quals;
6691 array_ptr_attrs = declarator->u.array.attrs;
6692 array_parm_static = declarator->u.array.static_p;
6693 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
6695 declarator = declarator->declarator;
6697 /* Check for some types that there cannot be arrays of. */
6699 if (VOID_TYPE_P (type))
6702 error_at (loc, "declaration of %qE as array of voids", name);
6704 error_at (loc, "declaration of type name as array of voids");
6705 type = error_mark_node;
6708 if (TREE_CODE (type) == FUNCTION_TYPE)
6711 error_at (loc, "declaration of %qE as array of functions",
6714 error_at (loc, "declaration of type name as array of "
6716 type = error_mark_node;
6719 if (pedantic && !in_system_header_at (input_location)
6720 && flexible_array_type_p (type))
6721 pedwarn (loc, OPT_Wpedantic,
6722 "invalid use of structure with flexible array member");
6724 if (size == error_mark_node)
6725 type = error_mark_node;
6727 if (type == error_mark_node)
6730 if (!verify_type_context (loc, TCTX_ARRAY_ELEMENT, type))
6732 type = error_mark_node;
6736 /* If size was specified, set ITYPE to a range-type for
6737 that size. Otherwise, ITYPE remains null. finish_decl
6738 may figure it out from an initial value. */
6742 bool size_maybe_const = true;
6743 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
6744 && !TREE_OVERFLOW (size));
6745 bool this_size_varies = false;
6747 /* Strip NON_LVALUE_EXPRs since we aren't using as an
6749 STRIP_TYPE_NOPS (size);
6751 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
6754 error_at (loc, "size of array %qE has non-integer type",
6758 "size of unnamed array has non-integer type");
6759 size = integer_one_node;
6760 size_int_const = true;
6762 /* This can happen with enum forward declaration. */
6763 else if (!COMPLETE_TYPE_P (TREE_TYPE (size)))
6766 error_at (loc, "size of array %qE has incomplete type",
6769 error_at (loc, "size of unnamed array has incomplete "
6771 size = integer_one_node;
6772 size_int_const = true;
6775 size = c_fully_fold (size, false, &size_maybe_const);
6777 if (pedantic && size_maybe_const && integer_zerop (size))
6780 pedwarn (loc, OPT_Wpedantic,
6781 "ISO C forbids zero-size array %qE", name);
6783 pedwarn (loc, OPT_Wpedantic,
6784 "ISO C forbids zero-size array");
6787 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
6789 constant_expression_warning (size);
6790 if (tree_int_cst_sgn (size) < 0)
6793 error_at (loc, "size of array %qE is negative", name);
6795 error_at (loc, "size of unnamed array is negative");
6796 size = integer_one_node;
6797 size_int_const = true;
6799 /* Handle a size folded to an integer constant but
6800 not an integer constant expression. */
6801 if (!size_int_const)
6803 /* If this is a file scope declaration of an
6804 ordinary identifier, this is invalid code;
6805 diagnosing it here and not subsequently
6806 treating the type as variable-length avoids
6807 more confusing diagnostics later. */
6808 if ((decl_context == NORMAL || decl_context == FIELD)
6809 && current_scope == file_scope)
6810 pedwarn (input_location, 0,
6811 "variably modified %qE at file scope",
6814 this_size_varies = size_varies = true;
6815 warn_variable_length_array (name, size);
6818 else if ((decl_context == NORMAL || decl_context == FIELD)
6819 && current_scope == file_scope)
6821 error_at (loc, "variably modified %qE at file scope", name);
6822 size = integer_one_node;
6826 /* Make sure the array size remains visibly
6827 nonconstant even if it is (eg) a const variable
6828 with known value. */
6829 this_size_varies = size_varies = true;
6830 warn_variable_length_array (name, size);
6831 if (sanitize_flags_p (SANITIZE_VLA)
6832 && current_function_decl != NULL_TREE
6833 && decl_context == NORMAL)
6835 /* Evaluate the array size only once. */
6836 size = save_expr (size);
6837 size = c_fully_fold (size, false, NULL);
6838 size = fold_build2 (COMPOUND_EXPR, TREE_TYPE (size),
6839 ubsan_instrument_vla (loc, size),
6844 if (integer_zerop (size) && !this_size_varies)
6846 /* A zero-length array cannot be represented with
6847 an unsigned index type, which is what we'll
6848 get with build_index_type. Create an
6849 open-ended range instead. */
6850 itype = build_range_type (sizetype, size, NULL_TREE);
6854 /* Arrange for the SAVE_EXPR on the inside of the
6855 MINUS_EXPR, which allows the -1 to get folded
6856 with the +1 that happens when building TYPE_SIZE. */
6858 size = save_expr (size);
6859 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
6860 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
6861 integer_zero_node, size);
6863 /* Compute the maximum valid index, that is, size
6864 - 1. Do the calculation in index_type, so that
6865 if it is a variable the computations will be
6866 done in the proper mode. */
6867 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
6868 convert (index_type, size),
6869 convert (index_type,
6872 /* The above overflows when size does not fit
6874 ??? While a size of INT_MAX+1 technically shouldn't
6875 cause an overflow (because we subtract 1), handling
6876 this case seems like an unnecessary complication. */
6877 if (TREE_CODE (size) == INTEGER_CST
6878 && !int_fits_type_p (size, index_type))
6881 error_at (loc, "size of array %qE is too large",
6884 error_at (loc, "size of unnamed array is too large");
6885 type = error_mark_node;
6889 itype = build_index_type (itype);
6891 if (this_size_varies)
6893 if (TREE_SIDE_EFFECTS (size))
6896 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
6901 *expr_const_operands &= size_maybe_const;
6904 else if (decl_context == FIELD)
6906 bool flexible_array_member = false;
6907 if (array_parm_vla_unspec_p)
6908 /* Field names can in fact have function prototype
6909 scope so [*] is disallowed here through making
6910 the field variably modified, not through being
6911 something other than a declaration with function
6916 const struct c_declarator *t = declarator;
6917 while (t->kind == cdk_attrs)
6919 flexible_array_member = (t->kind == cdk_id);
6921 if (flexible_array_member
6922 && !in_system_header_at (input_location))
6923 pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not "
6924 "support flexible array members");
6926 /* ISO C99 Flexible array members are effectively
6927 identical to GCC's zero-length array extension. */
6928 if (flexible_array_member || array_parm_vla_unspec_p)
6929 itype = build_range_type (sizetype, size_zero_node,
6932 else if (decl_context == PARM)
6934 if (array_parm_vla_unspec_p)
6936 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
6940 else if (decl_context == TYPENAME)
6942 if (array_parm_vla_unspec_p)
6945 warning (0, "%<[*]%> not in a declaration");
6946 /* We use this to avoid messing up with incomplete
6947 array types of the same type, that would
6948 otherwise be modified below. */
6949 itype = build_range_type (sizetype, size_zero_node,
6955 /* Complain about arrays of incomplete types. */
6956 if (!COMPLETE_TYPE_P (type))
6958 auto_diagnostic_group d;
6959 error_at (loc, "array type has incomplete element type %qT",
6961 /* See if we can be more helpful. */
6962 if (TREE_CODE (type) == ARRAY_TYPE)
6965 inform (loc, "declaration of %qE as multidimensional "
6966 "array must have bounds for all dimensions "
6967 "except the first", name);
6969 inform (loc, "declaration of multidimensional array "
6970 "must have bounds for all dimensions except "
6973 type = error_mark_node;
6976 /* When itype is NULL, a shared incomplete array type is
6977 returned for all array of a given type. Elsewhere we
6978 make sure we don't complete that type before copying
6979 it, but here we want to make sure we don't ever
6980 modify the shared type, so we gcc_assert (itype)
6983 addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals);
6984 if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type))
6985 type = build_qualified_type (type,
6986 ENCODE_QUAL_ADDR_SPACE (as));
6988 type = build_array_type (type, itype);
6991 if (type != error_mark_node)
6995 /* It is ok to modify type here even if itype is
6996 NULL: if size_varies, we're in a
6997 multi-dimensional array and the inner type has
6998 variable size, so the enclosing shared array type
7000 if (size && TREE_CODE (size) == INTEGER_CST)
7002 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
7003 C_TYPE_VARIABLE_SIZE (type) = 1;
7006 /* The GCC extension for zero-length arrays differs from
7007 ISO flexible array members in that sizeof yields
7009 if (size && integer_zerop (size))
7012 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
7013 TYPE_SIZE (type) = bitsize_zero_node;
7014 TYPE_SIZE_UNIT (type) = size_zero_node;
7015 SET_TYPE_STRUCTURAL_EQUALITY (type);
7017 if (array_parm_vla_unspec_p)
7020 /* The type is complete. C99 6.7.5.2p4 */
7021 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
7022 TYPE_SIZE (type) = bitsize_zero_node;
7023 TYPE_SIZE_UNIT (type) = size_zero_node;
7024 SET_TYPE_STRUCTURAL_EQUALITY (type);
7027 if (!valid_array_size_p (loc, type, name))
7028 type = error_mark_node;
7031 if (decl_context != PARM
7032 && (array_ptr_quals != TYPE_UNQUALIFIED
7033 || array_ptr_attrs != NULL_TREE
7034 || array_parm_static))
7036 error_at (loc, "static or type qualifiers in non-parameter "
7037 "array declarator");
7038 array_ptr_quals = TYPE_UNQUALIFIED;
7039 array_ptr_attrs = NULL_TREE;
7040 array_parm_static = false;
7042 orig_qual_indirect++;
7047 /* Say it's a definition only for the declarator closest
7048 to the identifier, apart possibly from some
7050 bool really_funcdef = false;
7052 orig_qual_type = NULL_TREE;
7055 const struct c_declarator *t = declarator->declarator;
7056 while (t->kind == cdk_attrs)
7058 really_funcdef = (t->kind == cdk_id);
7061 /* Declaring a function type. Make sure we have a valid
7062 type for the function to return. */
7063 if (type == error_mark_node)
7066 size_varies = false;
7068 /* Warn about some types functions can't return. */
7069 if (TREE_CODE (type) == FUNCTION_TYPE)
7072 error_at (loc, "%qE declared as function returning a "
7075 error_at (loc, "type name declared as function "
7076 "returning a function");
7077 type = integer_type_node;
7079 if (TREE_CODE (type) == ARRAY_TYPE)
7082 error_at (loc, "%qE declared as function returning an array",
7085 error_at (loc, "type name declared as function returning "
7087 type = integer_type_node;
7090 /* Construct the function type and go to the next
7091 inner layer of declarator. */
7092 arg_info = declarator->u.arg_info;
7093 arg_types = grokparms (arg_info, really_funcdef);
7095 /* Type qualifiers before the return type of the function
7096 qualify the return type, not the function type. */
7099 const enum c_declspec_word ignored_quals_list[] =
7101 cdw_const, cdw_volatile, cdw_restrict, cdw_address_space,
7102 cdw_atomic, cdw_number_of_elements
7104 location_t specs_loc
7105 = smallest_type_quals_location (declspecs->locations,
7106 ignored_quals_list);
7107 if (specs_loc == UNKNOWN_LOCATION)
7108 specs_loc = declspecs->locations[cdw_typedef];
7109 if (specs_loc == UNKNOWN_LOCATION)
7112 /* Type qualifiers on a function return type are
7113 normally permitted by the standard but have no
7114 effect, so give a warning at -Wreturn-type.
7115 Qualifiers on a void return type are banned on
7116 function definitions in ISO C; GCC used to used
7117 them for noreturn functions. The resolution of C11
7118 DR#423 means qualifiers (other than _Atomic) are
7119 actually removed from the return type when
7120 determining the function type. */
7121 int quals_used = type_quals;
7123 quals_used &= TYPE_QUAL_ATOMIC;
7124 if (quals_used && VOID_TYPE_P (type) && really_funcdef)
7125 pedwarn (specs_loc, 0,
7126 "function definition has qualified void "
7129 warning_at (specs_loc, OPT_Wignored_qualifiers,
7130 "type qualifiers ignored on function "
7133 /* Ensure an error for restrict on invalid types; the
7134 DR#423 resolution is not entirely clear about
7137 && (type_quals & TYPE_QUAL_RESTRICT)
7138 && (!POINTER_TYPE_P (type)
7139 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))))
7140 error_at (loc, "invalid use of %<restrict%>");
7141 type = c_build_qualified_type (type, quals_used);
7143 type_quals = TYPE_UNQUALIFIED;
7145 type = build_function_type (type, arg_types);
7146 declarator = declarator->declarator;
7148 /* Set the TYPE_CONTEXTs for each tagged type which is local to
7149 the formal parameter list of this FUNCTION_TYPE to point to
7150 the FUNCTION_TYPE node itself. */
7155 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
7156 TYPE_CONTEXT (tag->type) = type;
7162 /* Merge any constancy or volatility into the target type
7164 if ((type_quals & TYPE_QUAL_ATOMIC)
7165 && TREE_CODE (type) == FUNCTION_TYPE)
7168 "%<_Atomic%>-qualified function type");
7169 type_quals &= ~TYPE_QUAL_ATOMIC;
7171 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
7173 pedwarn (loc, OPT_Wpedantic,
7174 "ISO C forbids qualified function types");
7176 type = c_build_qualified_type (type, type_quals, orig_qual_type,
7177 orig_qual_indirect);
7178 orig_qual_type = NULL_TREE;
7179 size_varies = false;
7181 /* When the pointed-to type involves components of variable size,
7182 care must be taken to ensure that the size evaluation code is
7183 emitted early enough to dominate all the possible later uses
7184 and late enough for the variables on which it depends to have
7187 This is expected to happen automatically when the pointed-to
7188 type has a name/declaration of it's own, but special attention
7189 is required if the type is anonymous.
7191 We attach an artificial TYPE_DECL to such pointed-to type
7192 and arrange for it to be included in a DECL_EXPR. This
7193 forces the sizes evaluation at a safe point and ensures it
7194 is not deferred until e.g. within a deeper conditional context.
7196 PARM contexts have no enclosing statement list that
7197 can hold the DECL_EXPR, so we need to use a BIND_EXPR
7198 instead, and add it to the list of expressions that
7199 need to be evaluated.
7201 TYPENAME contexts do have an enclosing statement list,
7202 but it would be incorrect to use it, as the size should
7203 only be evaluated if the containing expression is
7204 evaluated. We might also be in the middle of an
7205 expression with side effects on the pointed-to type size
7206 "arguments" prior to the pointer declaration point and
7207 the fake TYPE_DECL in the enclosing context would force
7208 the size evaluation prior to the side effects. We therefore
7209 use BIND_EXPRs in TYPENAME contexts too. */
7210 if (!TYPE_NAME (type)
7211 && variably_modified_type_p (type, NULL_TREE))
7213 tree bind = NULL_TREE;
7214 if (decl_context == TYPENAME || decl_context == PARM)
7216 bind = build3 (BIND_EXPR, void_type_node, NULL_TREE,
7217 NULL_TREE, NULL_TREE);
7218 TREE_SIDE_EFFECTS (bind) = 1;
7219 BIND_EXPR_BODY (bind) = push_stmt_list ();
7222 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
7223 DECL_ARTIFICIAL (decl) = 1;
7225 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
7226 TYPE_NAME (type) = decl;
7230 BIND_EXPR_BODY (bind)
7231 = pop_stmt_list (BIND_EXPR_BODY (bind));
7233 *expr = build2 (COMPOUND_EXPR, void_type_node, *expr,
7240 type = c_build_pointer_type (type);
7242 /* Process type qualifiers (such as const or volatile)
7243 that were given inside the `*'. */
7244 type_quals = declarator->u.pointer_quals;
7246 declarator = declarator->declarator;
7253 *decl_attrs = chainon (returned_attrs, *decl_attrs);
7254 *decl_attrs = chainon (decl_id_attrs, *decl_attrs);
7256 /* Now TYPE has the actual type, apart from any qualifiers in
7259 /* Warn about address space used for things other than static memory or
7261 address_space = DECODE_QUAL_ADDR_SPACE (type_quals);
7262 if (!ADDR_SPACE_GENERIC_P (address_space))
7264 if (decl_context == NORMAL)
7266 switch (storage_class)
7269 error ("%qs combined with %<auto%> qualifier for %qE",
7270 c_addr_space_name (address_space), name);
7273 error ("%qs combined with %<register%> qualifier for %qE",
7274 c_addr_space_name (address_space), name);
7277 if (current_function_scope)
7279 error ("%qs specified for auto variable %qE",
7280 c_addr_space_name (address_space), name);
7292 else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE)
7295 error ("%qs specified for parameter %qE",
7296 c_addr_space_name (address_space), name);
7298 error ("%qs specified for unnamed parameter",
7299 c_addr_space_name (address_space));
7301 else if (decl_context == FIELD)
7304 error ("%qs specified for structure field %qE",
7305 c_addr_space_name (address_space), name);
7307 error ("%qs specified for structure field",
7308 c_addr_space_name (address_space));
7312 /* Check the type and width of a bit-field. */
7315 check_bitfield_type_and_width (loc, &type, width, name);
7316 /* C11 makes it implementation-defined (6.7.2.1#5) whether
7317 atomic types are permitted for bit-fields; we have no code to
7318 make bit-field accesses atomic, so disallow them. */
7319 if (type_quals & TYPE_QUAL_ATOMIC)
7322 error_at (loc, "bit-field %qE has atomic type", name);
7324 error_at (loc, "bit-field has atomic type");
7325 type_quals &= ~TYPE_QUAL_ATOMIC;
7329 /* Reject invalid uses of _Alignas. */
7330 if (declspecs->alignas_p)
7332 if (storage_class == csc_typedef)
7333 error_at (loc, "alignment specified for typedef %qE", name);
7334 else if (storage_class == csc_register)
7335 error_at (loc, "alignment specified for %<register%> object %qE",
7337 else if (decl_context == PARM)
7340 error_at (loc, "alignment specified for parameter %qE", name);
7342 error_at (loc, "alignment specified for unnamed parameter");
7347 error_at (loc, "alignment specified for bit-field %qE", name);
7349 error_at (loc, "alignment specified for unnamed bit-field");
7351 else if (TREE_CODE (type) == FUNCTION_TYPE)
7352 error_at (loc, "alignment specified for function %qE", name);
7353 else if (declspecs->align_log != -1 && TYPE_P (type))
7355 alignas_align = 1U << declspecs->align_log;
7356 if (alignas_align < min_align_of_type (type))
7359 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
7360 "alignment of %qE", name);
7362 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
7363 "alignment of unnamed field");
7369 /* If this is declaring a typedef name, return a TYPE_DECL. */
7371 if (storage_class == csc_typedef)
7374 if ((type_quals & TYPE_QUAL_ATOMIC)
7375 && TREE_CODE (type) == FUNCTION_TYPE)
7378 "%<_Atomic%>-qualified function type");
7379 type_quals &= ~TYPE_QUAL_ATOMIC;
7381 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
7383 pedwarn (loc, OPT_Wpedantic,
7384 "ISO C forbids qualified function types");
7386 type = c_build_qualified_type (type, type_quals, orig_qual_type,
7387 orig_qual_indirect);
7388 decl = build_decl (declarator->id_loc,
7389 TYPE_DECL, declarator->u.id.id, type);
7390 if (declspecs->explicit_signed_p)
7391 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
7392 if (declspecs->inline_p)
7393 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
7394 if (declspecs->noreturn_p)
7395 pedwarn (loc, 0,"typedef %q+D declared %<_Noreturn%>", decl);
7397 if (warn_cxx_compat && declarator->u.id.id != NULL_TREE)
7399 struct c_binding *b = I_TAG_BINDING (declarator->u.id.id);
7402 && b->decl != NULL_TREE
7403 && (B_IN_CURRENT_SCOPE (b)
7404 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
7405 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
7407 auto_diagnostic_group d;
7408 if (warning_at (declarator->id_loc, OPT_Wc___compat,
7409 ("using %qD as both a typedef and a tag is "
7410 "invalid in C++"), decl)
7411 && b->locus != UNKNOWN_LOCATION)
7412 inform (b->locus, "originally defined here");
7419 /* If this is a type name (such as, in a cast or sizeof),
7420 compute the type and return it now. */
7422 if (decl_context == TYPENAME)
7424 /* Note that the grammar rejects storage classes in typenames
7426 gcc_assert (storage_class == csc_none && !threadp
7427 && !declspecs->inline_p && !declspecs->noreturn_p);
7428 if ((type_quals & TYPE_QUAL_ATOMIC)
7429 && TREE_CODE (type) == FUNCTION_TYPE)
7432 "%<_Atomic%>-qualified function type");
7433 type_quals &= ~TYPE_QUAL_ATOMIC;
7435 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
7437 pedwarn (loc, OPT_Wpedantic,
7438 "ISO C forbids const or volatile function types");
7440 type = c_build_qualified_type (type, type_quals, orig_qual_type,
7441 orig_qual_indirect);
7445 if (pedantic && decl_context == FIELD
7446 && variably_modified_type_p (type, NULL_TREE))
7449 pedwarn (loc, OPT_Wpedantic, "a member of a structure or union cannot "
7450 "have a variably modified type");
7453 /* Aside from typedefs and type names (handle above),
7454 `void' at top level (not within pointer)
7455 is allowed only in public variables.
7456 We don't complain about parms either, but that is because
7457 a better error message can be made later. */
7459 if (VOID_TYPE_P (type) && decl_context != PARM
7460 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
7461 && (storage_class == csc_extern
7462 || (current_scope == file_scope
7463 && !(storage_class == csc_static
7464 || storage_class == csc_register)))))
7466 error_at (loc, "variable or field %qE declared void", name);
7467 type = integer_type_node;
7470 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
7471 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
7476 if (decl_context == PARM)
7479 bool array_parameter_p = false;
7481 /* A parameter declared as an array of T is really a pointer to T.
7482 One declared as a function is really a pointer to a function. */
7484 if (TREE_CODE (type) == ARRAY_TYPE)
7486 /* Transfer const-ness of array into that of type pointed to. */
7487 type = TREE_TYPE (type);
7488 if (orig_qual_type != NULL_TREE)
7490 if (orig_qual_indirect == 0)
7491 orig_qual_type = TREE_TYPE (orig_qual_type);
7493 orig_qual_indirect--;
7496 type = c_build_qualified_type (type, type_quals, orig_qual_type,
7497 orig_qual_indirect);
7498 type = c_build_pointer_type (type);
7499 type_quals = array_ptr_quals;
7501 type = c_build_qualified_type (type, type_quals);
7503 /* We don't yet implement attributes in this context. */
7504 if (array_ptr_attrs != NULL_TREE)
7505 warning_at (loc, OPT_Wattributes,
7506 "attributes in parameter array declarator ignored");
7508 size_varies = false;
7509 array_parameter_p = true;
7511 else if (TREE_CODE (type) == FUNCTION_TYPE)
7513 if (type_quals & TYPE_QUAL_ATOMIC)
7516 "%<_Atomic%>-qualified function type");
7517 type_quals &= ~TYPE_QUAL_ATOMIC;
7519 else if (type_quals)
7520 pedwarn (loc, OPT_Wpedantic,
7521 "ISO C forbids qualified function types");
7523 type = c_build_qualified_type (type, type_quals);
7524 type = c_build_pointer_type (type);
7525 type_quals = TYPE_UNQUALIFIED;
7527 else if (type_quals)
7528 type = c_build_qualified_type (type, type_quals);
7530 decl = build_decl (declarator->id_loc,
7531 PARM_DECL, declarator->u.id.id, type);
7533 C_DECL_VARIABLE_SIZE (decl) = 1;
7534 C_ARRAY_PARAMETER (decl) = array_parameter_p;
7536 /* Compute the type actually passed in the parmlist,
7537 for the case where there is no prototype.
7538 (For example, shorts and chars are passed as ints.)
7539 When there is a prototype, this is overridden later. */
7541 if (type == error_mark_node)
7542 promoted_type = type;
7544 promoted_type = c_type_promotes_to (type);
7546 DECL_ARG_TYPE (decl) = promoted_type;
7547 if (declspecs->inline_p)
7548 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
7549 if (declspecs->noreturn_p)
7550 pedwarn (loc, 0, "parameter %q+D declared %<_Noreturn%>", decl);
7552 else if (decl_context == FIELD)
7554 /* Note that the grammar rejects storage classes in typenames
7556 gcc_assert (storage_class == csc_none && !threadp
7557 && !declspecs->inline_p && !declspecs->noreturn_p);
7559 /* Structure field. It may not be a function. */
7561 if (TREE_CODE (type) == FUNCTION_TYPE)
7563 error_at (loc, "field %qE declared as a function", name);
7564 type = build_pointer_type (type);
7566 else if (TREE_CODE (type) != ERROR_MARK
7567 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
7570 error_at (loc, "field %qE has incomplete type", name);
7572 error_at (loc, "unnamed field has incomplete type");
7573 type = error_mark_node;
7575 else if (TREE_CODE (type) == ARRAY_TYPE
7576 && TYPE_DOMAIN (type) == NULL_TREE)
7578 /* We have a flexible array member through a typedef.
7579 Set suitable range. Whether this is a correct position
7580 for a flexible array member will be determined elsewhere. */
7581 if (!in_system_header_at (input_location))
7582 pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not "
7583 "support flexible array members");
7584 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
7585 TYPE_DOMAIN (type) = build_range_type (sizetype, size_zero_node,
7587 if (orig_qual_indirect == 0)
7588 orig_qual_type = NULL_TREE;
7590 if (type != error_mark_node
7591 && !verify_type_context (loc, TCTX_FIELD, type))
7592 type = error_mark_node;
7594 type = c_build_qualified_type (type, type_quals, orig_qual_type,
7595 orig_qual_indirect);
7596 decl = build_decl (declarator->id_loc,
7597 FIELD_DECL, declarator->u.id.id, type);
7598 DECL_NONADDRESSABLE_P (decl) = bitfield;
7599 if (bitfield && !declarator->u.id.id)
7600 DECL_PADDING_P (decl) = 1;
7603 C_DECL_VARIABLE_SIZE (decl) = 1;
7605 else if (TREE_CODE (type) == FUNCTION_TYPE)
7607 if (storage_class == csc_register || threadp)
7609 error_at (loc, "invalid storage class for function %qE", name);
7611 else if (current_scope != file_scope)
7613 /* Function declaration not at file scope. Storage
7614 classes other than `extern' are not allowed, C99
7615 6.7.1p5, and `extern' makes no difference. However,
7616 GCC allows 'auto', perhaps with 'inline', to support
7617 nested functions. */
7618 if (storage_class == csc_auto)
7619 pedwarn (loc, OPT_Wpedantic,
7620 "invalid storage class for function %qE", name);
7621 else if (storage_class == csc_static)
7623 error_at (loc, "invalid storage class for function %qE", name);
7625 storage_class = declspecs->storage_class = csc_none;
7631 decl = build_decl (declarator->id_loc,
7632 FUNCTION_DECL, declarator->u.id.id, type);
7633 decl = build_decl_attribute_variant (decl, decl_attr);
7635 if (type_quals & TYPE_QUAL_ATOMIC)
7638 "%<_Atomic%>-qualified function type");
7639 type_quals &= ~TYPE_QUAL_ATOMIC;
7641 else if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
7642 pedwarn (loc, OPT_Wpedantic,
7643 "ISO C forbids qualified function types");
7645 /* Every function declaration is an external reference
7646 (DECL_EXTERNAL) except for those which are not at file
7647 scope and are explicitly declared "auto". This is
7648 forbidden by standard C (C99 6.7.1p5) and is interpreted by
7649 GCC to signify a forward declaration of a nested function. */
7650 if (storage_class == csc_auto && current_scope != file_scope)
7651 DECL_EXTERNAL (decl) = 0;
7652 /* In C99, a function which is declared 'inline' with 'extern'
7653 is not an external reference (which is confusing). It
7654 means that the later definition of the function must be output
7655 in this file, C99 6.7.4p6. In GNU C89, a function declared
7656 'extern inline' is an external reference. */
7657 else if (declspecs->inline_p && storage_class != csc_static)
7658 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
7659 == flag_gnu89_inline);
7661 DECL_EXTERNAL (decl) = !initialized;
7663 /* Record absence of global scope for `static' or `auto'. */
7665 = !(storage_class == csc_static || storage_class == csc_auto);
7667 /* For a function definition, record the argument information
7668 block where store_parm_decls will look for it. */
7670 current_function_arg_info = arg_info;
7672 if (declspecs->default_int_p)
7673 C_FUNCTION_IMPLICIT_INT (decl) = 1;
7675 /* Record presence of `inline' and `_Noreturn', if it is
7677 if (flag_hosted && MAIN_NAME_P (declarator->u.id.id))
7679 if (declspecs->inline_p)
7680 pedwarn (loc, 0, "cannot inline function %<main%>");
7681 if (declspecs->noreturn_p)
7682 pedwarn (loc, 0, "%<main%> declared %<_Noreturn%>");
7686 if (declspecs->inline_p)
7687 /* Record that the function is declared `inline'. */
7688 DECL_DECLARED_INLINE_P (decl) = 1;
7689 if (declspecs->noreturn_p)
7692 pedwarn_c99 (loc, OPT_Wpedantic,
7693 "ISO C99 does not support %<_Noreturn%>");
7695 pedwarn_c99 (loc, OPT_Wpedantic,
7696 "ISO C90 does not support %<_Noreturn%>");
7697 TREE_THIS_VOLATILE (decl) = 1;
7703 /* It's a variable. */
7704 /* An uninitialized decl with `extern' is a reference. */
7705 int extern_ref = !initialized && storage_class == csc_extern;
7707 type = c_build_qualified_type (type, type_quals, orig_qual_type,
7708 orig_qual_indirect);
7710 /* C99 6.2.2p7: It is invalid (compile-time undefined
7711 behavior) to create an 'extern' declaration for a
7712 variable if there is a global declaration that is
7713 'static' and the global declaration is not visible.
7714 (If the static declaration _is_ currently visible,
7715 the 'extern' declaration is taken to refer to that decl.) */
7716 if (extern_ref && current_scope != file_scope)
7718 tree global_decl = identifier_global_value (declarator->u.id.id);
7719 tree visible_decl = lookup_name (declarator->u.id.id);
7722 && global_decl != visible_decl
7723 && VAR_P (global_decl)
7724 && !TREE_PUBLIC (global_decl))
7725 error_at (loc, "variable previously declared %<static%> "
7726 "redeclared %<extern%>");
7729 decl = build_decl (declarator->id_loc,
7730 VAR_DECL, declarator->u.id.id, type);
7732 C_DECL_VARIABLE_SIZE (decl) = 1;
7734 if (declspecs->inline_p)
7735 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
7736 if (declspecs->noreturn_p)
7737 pedwarn (loc, 0, "variable %q+D declared %<_Noreturn%>", decl);
7739 /* At file scope, an initialized extern declaration may follow
7740 a static declaration. In that case, DECL_EXTERNAL will be
7741 reset later in start_decl. */
7742 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
7744 /* At file scope, the presence of a `static' or `register' storage
7745 class specifier, or the absence of all storage class specifiers
7746 makes this declaration a definition (perhaps tentative). Also,
7747 the absence of `static' makes it public. */
7748 if (current_scope == file_scope)
7750 TREE_PUBLIC (decl) = storage_class != csc_static;
7751 TREE_STATIC (decl) = !extern_ref;
7753 /* Not at file scope, only `static' makes a static definition. */
7756 TREE_STATIC (decl) = (storage_class == csc_static);
7757 TREE_PUBLIC (decl) = extern_ref;
7761 set_decl_tls_model (decl, decl_default_tls_model (decl));
7764 if ((storage_class == csc_extern
7765 || (storage_class == csc_none
7766 && TREE_CODE (type) == FUNCTION_TYPE
7768 && variably_modified_type_p (type, NULL_TREE))
7771 if (TREE_CODE (type) == FUNCTION_TYPE)
7772 error_at (loc, "non-nested function with variably modified type");
7774 error_at (loc, "object with variably modified type must have "
7778 /* For nested functions disqualify ones taking VLAs by value
7779 from inlining since the middle-end cannot deal with this.
7780 ??? We should arrange for those to be passed by reference
7781 with emitting the copy on the caller side in the frontend. */
7782 if (storage_class == csc_none
7783 && TREE_CODE (type) == FUNCTION_TYPE)
7784 for (tree al = TYPE_ARG_TYPES (type); al; al = TREE_CHAIN (al))
7786 tree arg = TREE_VALUE (al);
7787 if (arg != error_mark_node
7788 && C_TYPE_VARIABLE_SIZE (arg))
7790 DECL_UNINLINABLE (decl) = 1;
7795 /* Record `register' declaration for warnings on &
7796 and in case doing stupid register allocation. */
7798 if (storage_class == csc_register)
7800 C_DECL_REGISTER (decl) = 1;
7801 DECL_REGISTER (decl) = 1;
7804 /* Record constancy and volatility. */
7805 c_apply_type_quals_to_decl (type_quals, decl);
7807 /* Apply _Alignas specifiers. */
7810 SET_DECL_ALIGN (decl, alignas_align * BITS_PER_UNIT);
7811 DECL_USER_ALIGN (decl) = 1;
7814 /* If a type has volatile components, it should be stored in memory.
7815 Otherwise, the fact that those components are volatile
7816 will be ignored, and would even crash the compiler.
7817 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
7818 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
7819 && (VAR_P (decl) || TREE_CODE (decl) == PARM_DECL
7820 || TREE_CODE (decl) == RESULT_DECL))
7822 /* It is not an error for a structure with volatile fields to
7823 be declared register, but reset DECL_REGISTER since it
7824 cannot actually go in a register. */
7825 int was_reg = C_DECL_REGISTER (decl);
7826 C_DECL_REGISTER (decl) = 0;
7827 DECL_REGISTER (decl) = 0;
7828 c_mark_addressable (decl);
7829 C_DECL_REGISTER (decl) = was_reg;
7832 /* This is the earliest point at which we might know the assembler
7833 name of a variable. Thus, if it's known before this, die horribly. */
7834 gcc_assert (!HAS_DECL_ASSEMBLER_NAME_P (decl)
7835 || !DECL_ASSEMBLER_NAME_SET_P (decl));
7839 && TREE_PUBLIC (decl)
7840 && TREE_STATIC (decl)
7841 && (RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl))
7842 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
7843 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
7844 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
7845 ("non-local variable %qD with anonymous type is "
7846 "questionable in C++"),
7853 /* Decode the parameter-list info for a function type or function definition.
7854 The argument is the value returned by `get_parm_info' (or made in c-parse.c
7855 if there is an identifier list instead of a parameter decl list).
7856 These two functions are separate because when a function returns
7857 or receives functions then each is called multiple times but the order
7858 of calls is different. The last call to `grokparms' is always the one
7859 that contains the formal parameter names of a function definition.
7861 Return a list of arg types to use in the FUNCTION_TYPE for this function.
7863 FUNCDEF_FLAG is true for a function definition, false for
7864 a mere declaration. A nonempty identifier-list gets an error message
7865 when FUNCDEF_FLAG is false. */
7868 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
7870 tree arg_types = arg_info->types;
7872 if (funcdef_flag && arg_info->had_vla_unspec)
7874 /* A function definition isn't function prototype scope C99 6.2.1p4. */
7876 error ("%<[*]%> not allowed in other than function prototype scope");
7879 if (arg_types == NULL_TREE && !funcdef_flag
7880 && !in_system_header_at (input_location))
7881 warning (OPT_Wstrict_prototypes,
7882 "function declaration isn%'t a prototype");
7884 if (arg_types == error_mark_node)
7885 /* Don't set TYPE_ARG_TYPES in this case. */
7888 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
7892 pedwarn (input_location, 0, "parameter names (without types) in "
7893 "function declaration");
7894 arg_info->parms = NULL_TREE;
7897 arg_info->parms = arg_info->types;
7899 arg_info->types = NULL_TREE;
7904 tree parm, type, typelt;
7905 unsigned int parmno;
7907 /* In C2X, convert () in a function definition to (void). */
7911 && !arg_info->parms)
7912 arg_types = arg_info->types = void_list_node;
7914 /* If there is a parameter of incomplete type in a definition,
7915 this is an error. In a declaration this is valid, and a
7916 struct or union type may be completed later, before any calls
7917 or definition of the function. In the case where the tag was
7918 first declared within the parameter list, a warning has
7919 already been given. If a parameter has void type, then
7920 however the function cannot be defined or called, so
7923 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
7925 parm = DECL_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
7927 type = TREE_VALUE (typelt);
7928 if (type == error_mark_node)
7931 if (!COMPLETE_TYPE_P (type))
7935 if (DECL_NAME (parm))
7936 error_at (input_location,
7937 "parameter %u (%q+D) has incomplete type",
7940 error_at (DECL_SOURCE_LOCATION (parm),
7941 "parameter %u has incomplete type",
7944 TREE_VALUE (typelt) = error_mark_node;
7945 TREE_TYPE (parm) = error_mark_node;
7946 arg_types = NULL_TREE;
7948 else if (VOID_TYPE_P (type))
7950 if (DECL_NAME (parm))
7951 warning_at (input_location, 0,
7952 "parameter %u (%q+D) has void type",
7955 warning_at (DECL_SOURCE_LOCATION (parm), 0,
7956 "parameter %u has void type",
7961 if (DECL_NAME (parm) && TREE_USED (parm))
7962 warn_if_shadowing (parm);
7968 /* Allocate and initialize a c_arg_info structure from the parser's
7972 build_arg_info (void)
7974 struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info);
7975 ret->parms = NULL_TREE;
7977 ret->types = NULL_TREE;
7978 ret->others = NULL_TREE;
7979 ret->pending_sizes = NULL;
7980 ret->had_vla_unspec = 0;
7984 /* Take apart the current scope and return a c_arg_info structure with
7985 info on a parameter list just parsed.
7987 This structure is later fed to 'grokparms' and 'store_parm_decls'.
7989 ELLIPSIS being true means the argument list ended in '...' so don't
7990 append a sentinel (void_list_node) to the end of the type-list.
7992 EXPR is NULL or an expression that needs to be evaluated for the
7993 side effects of array size expressions in the parameters. */
7996 get_parm_info (bool ellipsis, tree expr)
7998 struct c_binding *b = current_scope->bindings;
7999 struct c_arg_info *arg_info = build_arg_info ();
8001 tree parms = NULL_TREE;
8002 vec<c_arg_tag, va_gc> *tags = NULL;
8003 tree types = NULL_TREE;
8004 tree others = NULL_TREE;
8006 bool gave_void_only_once_err = false;
8008 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
8010 /* The bindings in this scope must not get put into a block.
8011 We will take care of deleting the binding nodes. */
8012 current_scope->bindings = 0;
8014 /* This function is only called if there was *something* on the
8018 /* A parameter list consisting solely of 'void' indicates that the
8019 function takes no arguments. But if the 'void' is qualified
8020 (by 'const' or 'volatile'), or has a storage class specifier
8021 ('register'), then the behavior is undefined; issue an error.
8022 Typedefs for 'void' are OK (see DR#157). */
8023 if (b->prev == 0 /* one binding */
8024 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
8025 && !DECL_NAME (b->decl) /* anonymous */
8026 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
8028 if (TYPE_QUALS (TREE_TYPE (b->decl)) != TYPE_UNQUALIFIED
8029 || C_DECL_REGISTER (b->decl))
8030 error_at (b->locus, "%<void%> as only parameter may not be qualified");
8032 /* There cannot be an ellipsis. */
8034 error_at (b->locus, "%<void%> must be the only parameter");
8036 arg_info->types = void_list_node;
8041 types = void_list_node;
8043 /* Break up the bindings list into parms, tags, types, and others;
8044 apply sanity checks; purge the name-to-decl bindings. */
8047 tree decl = b->decl;
8048 tree type = TREE_TYPE (decl);
8050 const char *keyword;
8052 switch (TREE_CODE (decl))
8057 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
8058 I_SYMBOL_BINDING (b->id) = b->shadowed;
8061 /* Check for forward decls that never got their actual decl. */
8062 if (TREE_ASM_WRITTEN (decl))
8064 "parameter %q+D has just a forward declaration", decl);
8065 /* Check for (..., void, ...) and issue an error. */
8066 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
8068 if (!gave_void_only_once_err)
8070 error_at (b->locus, "%<void%> must be the only parameter");
8071 gave_void_only_once_err = true;
8076 /* Valid parameter, add it to the list. */
8077 DECL_CHAIN (decl) = parms;
8080 /* Since there is a prototype, args are passed in their
8081 declared types. The back end may override this later. */
8082 DECL_ARG_TYPE (decl) = type;
8083 types = tree_cons (0, type, types);
8087 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
8088 case UNION_TYPE: keyword = "union"; goto tag;
8089 case RECORD_TYPE: keyword = "struct"; goto tag;
8091 /* Types may not have tag-names, in which case the type
8092 appears in the bindings list with b->id NULL. */
8095 gcc_assert (I_TAG_BINDING (b->id) == b);
8096 I_TAG_BINDING (b->id) = b->shadowed;
8099 /* Warn about any struct, union or enum tags defined in a
8100 parameter list. The scope of such types is limited to
8101 the parameter list, which is rarely if ever desirable
8102 (it's impossible to call such a function with type-
8103 correct arguments). An anonymous union parm type is
8104 meaningful as a GNU extension, so don't warn for that. */
8105 if (TREE_CODE (decl) != UNION_TYPE || b->id != NULL_TREE)
8108 /* The %s will be one of 'struct', 'union', or 'enum'. */
8109 warning_at (b->locus, 0,
8110 "%<%s %E%> declared inside parameter list"
8111 " will not be visible outside of this definition or"
8112 " declaration", keyword, b->id);
8114 /* The %s will be one of 'struct', 'union', or 'enum'. */
8115 warning_at (b->locus, 0,
8116 "anonymous %s declared inside parameter list"
8117 " will not be visible outside of this definition or"
8118 " declaration", keyword);
8123 vec_safe_push (tags, tag);
8127 /* FUNCTION_DECLs appear when there is an implicit function
8128 declaration in the parameter list. */
8129 gcc_assert (b->nested || seen_error ());
8134 /* CONST_DECLs appear here when we have an embedded enum,
8135 and TYPE_DECLs appear here when we have an embedded struct
8136 or union. No warnings for this - we already warned about the
8139 /* When we reinsert this decl in the function body, we need
8140 to reconstruct whether it was marked as nested. */
8141 gcc_assert (!b->nested);
8142 DECL_CHAIN (decl) = others;
8148 /* error_mark_node appears here when we have an undeclared
8149 variable. Just throw it away. */
8152 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
8153 I_SYMBOL_BINDING (b->id) = b->shadowed;
8157 /* Other things that might be encountered. */
8164 b = free_binding_and_advance (b);
8167 arg_info->parms = parms;
8168 arg_info->tags = tags;
8169 arg_info->types = types;
8170 arg_info->others = others;
8171 arg_info->pending_sizes = expr;
8175 /* Get the struct, enum or union (CODE says which) with tag NAME.
8176 Define the tag as a forward-reference with location LOC if it is
8177 not defined. HAVE_STD_ATTRS says whether any standard attributes
8178 were present after the struct, union or enum keyword; ATTRS are the
8179 standard attributes present there. Return a c_typespec structure
8180 for the type specifier. */
8183 parser_xref_tag (location_t loc, enum tree_code code, tree name,
8184 bool have_std_attrs, tree attrs)
8186 struct c_typespec ret;
8190 ret.expr = NULL_TREE;
8191 ret.expr_const_operands = true;
8193 /* If a cross reference is requested, look up the type
8194 already defined for this tag and return it. */
8196 ref = lookup_tag (code, name, false, &refloc);
8197 /* If this is the right type of tag, return what we found.
8198 (This reference will be shadowed by shadow_tag later if appropriate.)
8199 If this is the wrong type of tag, do not return it. If it was the
8200 wrong type in the same scope, we will have had an error
8201 message already; if in a different scope and declaring
8202 a name, pending_xref_error will give an error message; but if in a
8203 different scope and not declaring a name, this tag should
8204 shadow the previous declaration of a different type of tag, and
8205 this would not work properly if we return the reference found.
8206 (For example, with "struct foo" in an outer scope, "union foo;"
8207 must shadow that tag with a new one of union type.) */
8209 ? (have_std_attrs ? ctsk_tagref_attrs : ctsk_tagref)
8210 : (have_std_attrs ? ctsk_tagfirstref_attrs : ctsk_tagfirstref));
8211 if (ref && TREE_CODE (ref) == code)
8213 decl_attributes (&ref, attrs, (int) ATTR_FLAG_TYPE_IN_PLACE);
8214 if (C_TYPE_DEFINED_IN_STRUCT (ref)
8215 && loc != UNKNOWN_LOCATION
8218 auto_diagnostic_group d;
8222 if (warning_at (loc, OPT_Wc___compat,
8223 ("enum type defined in struct or union "
8224 "is not visible in C++")))
8225 inform (refloc, "enum type defined here");
8228 if (warning_at (loc, OPT_Wc___compat,
8229 ("struct defined in struct or union "
8230 "is not visible in C++")))
8231 inform (refloc, "struct defined here");
8234 if (warning_at (loc, OPT_Wc___compat,
8235 ("union defined in struct or union "
8236 "is not visible in C++")))
8237 inform (refloc, "union defined here");
8248 /* If no such tag is yet defined, create a forward-reference node
8249 and record it as the "definition".
8250 When a real declaration of this type is found,
8251 the forward-reference will be altered into a real type. */
8253 ref = make_node (code);
8254 if (code == ENUMERAL_TYPE)
8256 /* Give the type a default layout like unsigned int
8257 to avoid crashing if it does not get defined. */
8258 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
8259 SET_TYPE_ALIGN (ref, TYPE_ALIGN (unsigned_type_node));
8260 TYPE_USER_ALIGN (ref) = 0;
8261 TYPE_UNSIGNED (ref) = 1;
8262 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
8263 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
8264 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
8267 pushtag (loc, name, ref);
8268 decl_attributes (&ref, attrs, (int) ATTR_FLAG_TYPE_IN_PLACE);
8274 /* Get the struct, enum or union (CODE says which) with tag NAME.
8275 Define the tag as a forward-reference if it is not defined.
8276 Return a tree for the type. */
8279 xref_tag (enum tree_code code, tree name)
8281 return parser_xref_tag (input_location, code, name, false, NULL_TREE).spec;
8284 /* Make sure that the tag NAME is defined *in the current scope*
8285 at least as a forward reference.
8286 LOC is the location of the struct's definition.
8287 CODE says which kind of tag NAME ought to be.
8289 This stores the current value of the file static STRUCT_PARSE_INFO
8290 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
8291 new c_struct_parse_info structure. The old value of
8292 STRUCT_PARSE_INFO is restored in finish_struct. */
8295 start_struct (location_t loc, enum tree_code code, tree name,
8296 class c_struct_parse_info **enclosing_struct_parse_info)
8298 /* If there is already a tag defined at this scope
8299 (as a forward reference), just return it. */
8301 tree ref = NULL_TREE;
8302 location_t refloc = UNKNOWN_LOCATION;
8304 if (name != NULL_TREE)
8305 ref = lookup_tag (code, name, true, &refloc);
8306 if (ref && TREE_CODE (ref) == code)
8308 if (TYPE_STUB_DECL (ref))
8309 refloc = DECL_SOURCE_LOCATION (TYPE_STUB_DECL (ref));
8311 if (TYPE_SIZE (ref))
8313 auto_diagnostic_group d;
8314 if (code == UNION_TYPE)
8315 error_at (loc, "redefinition of %<union %E%>", name);
8317 error_at (loc, "redefinition of %<struct %E%>", name);
8318 if (refloc != UNKNOWN_LOCATION)
8319 inform (refloc, "originally defined here");
8320 /* Don't create structures using a name already in use. */
8323 else if (C_TYPE_BEING_DEFINED (ref))
8325 if (code == UNION_TYPE)
8326 error_at (loc, "nested redefinition of %<union %E%>", name);
8328 error_at (loc, "nested redefinition of %<struct %E%>", name);
8329 /* Don't bother to report "originally defined here" for a
8330 nested redefinition; the original definition should be
8332 /* Don't create structures that contain themselves. */
8337 /* Otherwise create a forward-reference just so the tag is in scope. */
8339 if (ref == NULL_TREE || TREE_CODE (ref) != code)
8341 ref = make_node (code);
8342 pushtag (loc, name, ref);
8345 C_TYPE_BEING_DEFINED (ref) = 1;
8346 for (tree v = TYPE_MAIN_VARIANT (ref); v; v = TYPE_NEXT_VARIANT (v))
8347 TYPE_PACKED (v) = flag_pack_struct;
8349 *enclosing_struct_parse_info = struct_parse_info;
8350 struct_parse_info = new c_struct_parse_info ();
8352 /* FIXME: This will issue a warning for a use of a type defined
8353 within a statement expr used within sizeof, et. al. This is not
8354 terribly serious as C++ doesn't permit statement exprs within
8356 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
8357 warning_at (loc, OPT_Wc___compat,
8358 "defining type in %qs expression is invalid in C++",
8361 : (in_typeof ? "typeof" : "alignof")));
8366 /* Process the specs, declarator and width (NULL if omitted)
8367 of a structure component, returning a FIELD_DECL node.
8368 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
8369 DECL_ATTRS is as for grokdeclarator.
8371 LOC is the location of the structure component.
8373 This is done during the parsing of the struct declaration.
8374 The FIELD_DECL nodes are chained together and the lot of them
8375 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
8378 grokfield (location_t loc,
8379 struct c_declarator *declarator, struct c_declspecs *declspecs,
8380 tree width, tree *decl_attrs)
8384 if (declarator->kind == cdk_id && declarator->u.id.id == NULL_TREE
8385 && width == NULL_TREE)
8387 /* This is an unnamed decl.
8389 If we have something of the form "union { list } ;" then this
8390 is the anonymous union extension. Similarly for struct.
8392 If this is something of the form "struct foo;", then
8393 If MS or Plan 9 extensions are enabled, this is handled as
8394 an anonymous struct.
8395 Otherwise this is a forward declaration of a structure tag.
8397 If this is something of the form "foo;" and foo is a TYPE_DECL, then
8398 If foo names a structure or union without a tag, then this
8399 is an anonymous struct (this is permitted by C11).
8400 If MS or Plan 9 extensions are enabled and foo names a
8401 structure, then again this is an anonymous struct.
8402 Otherwise this is an error.
8404 Oh what a horrid tangled web we weave. I wonder if MS consciously
8405 took this from Plan 9 or if it was an accident of implementation
8406 that took root before someone noticed the bug... */
8408 tree type = declspecs->type;
8411 if (RECORD_OR_UNION_TYPE_P (type)
8412 && (flag_ms_extensions
8413 || flag_plan9_extensions
8414 || !declspecs->typedef_p))
8416 if (flag_ms_extensions || flag_plan9_extensions)
8418 else if (TYPE_NAME (type) == NULL)
8425 pedwarn (loc, 0, "declaration does not declare anything");
8429 pedwarn_c99 (loc, OPT_Wpedantic,
8430 "ISO C99 doesn%'t support unnamed structs/unions");
8432 pedwarn_c99 (loc, OPT_Wpedantic,
8433 "ISO C90 doesn%'t support unnamed structs/unions");
8436 value = grokdeclarator (declarator, declspecs, FIELD, false,
8437 width ? &width : NULL, decl_attrs, NULL, NULL,
8440 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
8441 DECL_INITIAL (value) = width;
8443 SET_DECL_C_BIT_FIELD (value);
8445 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
8447 /* If we currently have a binding for this field, set the
8448 in_struct field in the binding, so that we warn about lookups
8450 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
8453 /* If the in_struct field is not yet set, push it on a list
8454 to be cleared when this struct is finished. */
8457 struct_parse_info->fields.safe_push (b);
8466 /* Subroutine of detect_field_duplicates: return whether X and Y,
8467 which are both fields in the same struct, have duplicate field
8471 is_duplicate_field (tree x, tree y)
8473 if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y))
8476 /* When using -fplan9-extensions, an anonymous field whose name is a
8477 typedef can duplicate a field name. */
8478 if (flag_plan9_extensions
8479 && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE))
8481 tree xt, xn, yt, yn;
8484 if (DECL_NAME (x) != NULL_TREE)
8486 else if (RECORD_OR_UNION_TYPE_P (xt)
8487 && TYPE_NAME (xt) != NULL_TREE
8488 && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL)
8489 xn = DECL_NAME (TYPE_NAME (xt));
8494 if (DECL_NAME (y) != NULL_TREE)
8496 else if (RECORD_OR_UNION_TYPE_P (yt)
8497 && TYPE_NAME (yt) != NULL_TREE
8498 && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL)
8499 yn = DECL_NAME (TYPE_NAME (yt));
8503 if (xn != NULL_TREE && xn == yn)
8510 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
8511 to HTAB, giving errors for any duplicates. */
8514 detect_field_duplicates_hash (tree fieldlist,
8515 hash_table<nofree_ptr_hash <tree_node> > *htab)
8520 for (x = fieldlist; x ; x = DECL_CHAIN (x))
8521 if ((y = DECL_NAME (x)) != NULL_TREE)
8523 slot = htab->find_slot (y, INSERT);
8526 error ("duplicate member %q+D", x);
8527 DECL_NAME (x) = NULL_TREE;
8531 else if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (x)))
8533 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab);
8535 /* When using -fplan9-extensions, an anonymous field whose
8536 name is a typedef can duplicate a field name. */
8537 if (flag_plan9_extensions
8538 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
8539 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)
8541 tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x)));
8542 slot = htab->find_slot (xn, INSERT);
8544 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x)));
8550 /* Generate an error for any duplicate field names in FIELDLIST. Munge
8551 the list such that this does not present a problem later. */
8554 detect_field_duplicates (tree fieldlist)
8559 /* If the struct is the list of instance variables of an Objective-C
8560 class, then we need to check all the instance variables of
8561 superclasses when checking for duplicates (since you can't have
8562 an instance variable in a subclass with the same name as an
8563 instance variable in a superclass). We pass on this job to the
8564 Objective-C compiler. objc_detect_field_duplicates() will return
8565 false if we are not checking the list of instance variables and
8566 the C frontend should proceed with the standard field duplicate
8567 checks. If we are checking the list of instance variables, the
8568 ObjC frontend will do the check, emit the errors if needed, and
8569 then return true. */
8570 if (c_dialect_objc ())
8571 if (objc_detect_field_duplicates (false))
8574 /* First, see if there are more than "a few" fields.
8575 This is trivially true if there are zero or one fields. */
8576 if (!fieldlist || !DECL_CHAIN (fieldlist))
8581 if (DECL_NAME (x) == NULL_TREE
8582 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x)))
8585 } while (timeout > 0 && x);
8587 /* If there were "few" fields and no anonymous structures or unions,
8588 avoid the overhead of allocating a hash table. Instead just do
8589 the nested traversal thing. */
8592 for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x))
8593 /* When using -fplan9-extensions, we can have duplicates
8594 between typedef names and fields. */
8596 || (flag_plan9_extensions
8597 && DECL_NAME (x) == NULL_TREE
8598 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x))
8599 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
8600 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL))
8602 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
8603 if (is_duplicate_field (y, x))
8605 error ("duplicate member %q+D", x);
8606 DECL_NAME (x) = NULL_TREE;
8612 hash_table<nofree_ptr_hash <tree_node> > htab (37);
8613 detect_field_duplicates_hash (fieldlist, &htab);
8617 /* Finish up struct info used by -Wc++-compat. */
8620 warn_cxx_compat_finish_struct (tree fieldlist, enum tree_code code,
8621 location_t record_loc)
8625 struct c_binding *b;
8627 if (fieldlist == NULL_TREE)
8629 if (code == RECORD_TYPE)
8630 warning_at (record_loc, OPT_Wc___compat,
8631 "empty struct has size 0 in C, size 1 in C++");
8633 warning_at (record_loc, OPT_Wc___compat,
8634 "empty union has size 0 in C, size 1 in C++");
8637 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
8638 the current struct. We do this now at the end of the struct
8639 because the flag is used to issue visibility warnings, and we
8640 only want to issue those warnings if the type is referenced
8641 outside of the struct declaration. */
8642 FOR_EACH_VEC_ELT (struct_parse_info->struct_types, ix, x)
8643 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
8645 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
8646 typedefs used when declaring fields in this struct. If the name
8647 of any of the fields is also a typedef name then the struct would
8648 not parse in C++, because the C++ lookup rules say that the
8649 typedef name would be looked up in the context of the struct, and
8650 would thus be the field rather than the typedef. */
8651 if (!struct_parse_info->typedefs_seen.is_empty ()
8652 && fieldlist != NULL_TREE)
8654 /* Use a hash_set<tree> using the name of the typedef. We can use
8655 a hash_set<tree> because identifiers are interned. */
8656 hash_set<tree> tset;
8658 FOR_EACH_VEC_ELT (struct_parse_info->typedefs_seen, ix, x)
8659 tset.add (DECL_NAME (x));
8661 for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x))
8663 if (DECL_NAME (x) != NULL_TREE
8664 && tset.contains (DECL_NAME (x)))
8666 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
8667 ("using %qD as both field and typedef name is "
8670 /* FIXME: It would be nice to report the location where
8671 the typedef name is used. */
8676 /* For each field which has a binding and which was not defined in
8677 an enclosing struct, clear the in_struct field. */
8678 FOR_EACH_VEC_ELT (struct_parse_info->fields, ix, b)
8682 /* Function to help qsort sort FIELD_DECLs by name order. */
8685 field_decl_cmp (const void *x_p, const void *y_p)
8687 const tree *const x = (const tree *) x_p;
8688 const tree *const y = (const tree *) y_p;
8690 if (DECL_NAME (*x) == DECL_NAME (*y))
8691 /* A nontype is "greater" than a type. */
8692 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL);
8693 if (DECL_NAME (*x) == NULL_TREE)
8695 if (DECL_NAME (*y) == NULL_TREE)
8697 if (DECL_NAME (*x) < DECL_NAME (*y))
8702 /* If this structure or union completes the type of any previous
8703 variable declaration, lay it out and output its rtl. */
8705 finish_incomplete_vars (tree incomplete_vars, bool toplevel)
8707 for (tree x = incomplete_vars; x; x = TREE_CHAIN (x))
8709 tree decl = TREE_VALUE (x);
8710 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
8711 layout_array_type (TREE_TYPE (decl));
8712 if (TREE_CODE (decl) != TYPE_DECL)
8714 relayout_decl (decl);
8715 if (c_dialect_objc ())
8716 objc_check_decl (decl);
8717 rest_of_decl_compilation (decl, toplevel, 0);
8722 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
8723 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
8724 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
8725 ATTRIBUTES are attributes to be applied to the structure.
8727 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
8728 the struct was started. */
8731 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
8732 class c_struct_parse_info *enclosing_struct_parse_info)
8735 bool toplevel = file_scope == current_scope;
8737 /* If this type was previously laid out as a forward reference,
8738 make sure we lay it out again. */
8740 TYPE_SIZE (t) = NULL_TREE;
8742 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
8746 for (x = fieldlist; x; x = DECL_CHAIN (x))
8748 if (DECL_NAME (x) != NULL_TREE)
8750 if (flag_isoc11 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x)))
8756 if (TREE_CODE (t) == UNION_TYPE)
8759 pedwarn (loc, OPT_Wpedantic, "union has no named members");
8761 pedwarn (loc, OPT_Wpedantic, "union has no members");
8766 pedwarn (loc, OPT_Wpedantic, "struct has no named members");
8768 pedwarn (loc, OPT_Wpedantic, "struct has no members");
8773 /* Install struct as DECL_CONTEXT of each field decl.
8774 Also process specified field sizes, found in the DECL_INITIAL,
8775 storing 0 there after the type has been changed to precision equal
8776 to its width, rather than the precision of the specified standard
8777 type. (Correct layout requires the original type to have been preserved
8780 bool saw_named_field = false;
8781 for (x = fieldlist; x; x = DECL_CHAIN (x))
8783 if (TREE_TYPE (x) == error_mark_node)
8786 DECL_CONTEXT (x) = t;
8788 /* If any field is const, the structure type is pseudo-const. */
8789 if (TREE_READONLY (x))
8790 C_TYPE_FIELDS_READONLY (t) = 1;
8793 /* A field that is pseudo-const makes the structure likewise. */
8794 tree t1 = strip_array_types (TREE_TYPE (x));
8795 if (RECORD_OR_UNION_TYPE_P (t1) && C_TYPE_FIELDS_READONLY (t1))
8796 C_TYPE_FIELDS_READONLY (t) = 1;
8799 /* Any field that is volatile means variables of this type must be
8800 treated in some ways as volatile. */
8801 if (TREE_THIS_VOLATILE (x))
8802 C_TYPE_FIELDS_VOLATILE (t) = 1;
8804 /* Any field of nominal variable size implies structure is too. */
8805 if (C_DECL_VARIABLE_SIZE (x))
8806 C_TYPE_VARIABLE_SIZE (t) = 1;
8808 if (DECL_C_BIT_FIELD (x))
8810 unsigned HOST_WIDE_INT width = tree_to_uhwi (DECL_INITIAL (x));
8811 DECL_SIZE (x) = bitsize_int (width);
8812 DECL_BIT_FIELD (x) = 1;
8816 && (DECL_BIT_FIELD (x)
8817 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
8818 DECL_PACKED (x) = 1;
8820 /* Detect flexible array member in an invalid context. */
8821 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
8822 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
8823 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
8824 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
8826 if (TREE_CODE (t) == UNION_TYPE)
8828 error_at (DECL_SOURCE_LOCATION (x),
8829 "flexible array member in union");
8830 TREE_TYPE (x) = error_mark_node;
8832 else if (DECL_CHAIN (x) != NULL_TREE)
8834 error_at (DECL_SOURCE_LOCATION (x),
8835 "flexible array member not at end of struct");
8836 TREE_TYPE (x) = error_mark_node;
8838 else if (!saw_named_field)
8840 error_at (DECL_SOURCE_LOCATION (x),
8841 "flexible array member in a struct with no named "
8843 TREE_TYPE (x) = error_mark_node;
8847 if (pedantic && TREE_CODE (t) == RECORD_TYPE
8848 && flexible_array_type_p (TREE_TYPE (x)))
8849 pedwarn (DECL_SOURCE_LOCATION (x), OPT_Wpedantic,
8850 "invalid use of structure with flexible array member");
8853 || RECORD_OR_UNION_TYPE_P (TREE_TYPE (x)))
8854 saw_named_field = true;
8857 detect_field_duplicates (fieldlist);
8859 /* Now we have the nearly final fieldlist. Record it,
8860 then lay out the structure or union (including the fields). */
8862 TYPE_FIELDS (t) = fieldlist;
8864 maybe_apply_pragma_scalar_storage_order (t);
8868 if (TYPE_SIZE_UNIT (t)
8869 && TREE_CODE (TYPE_SIZE_UNIT (t)) == INTEGER_CST
8870 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t))
8871 && !valid_constant_size_p (TYPE_SIZE_UNIT (t)))
8872 error ("type %qT is too large", t);
8874 /* Give bit-fields their proper types and rewrite the type of array fields
8875 with scalar component if the enclosing type has reverse storage order. */
8876 for (tree field = fieldlist; field; field = DECL_CHAIN (field))
8878 if (TREE_CODE (field) == FIELD_DECL
8879 && DECL_INITIAL (field)
8880 && TREE_TYPE (field) != error_mark_node)
8882 unsigned HOST_WIDE_INT width
8883 = tree_to_uhwi (DECL_INITIAL (field));
8884 tree type = TREE_TYPE (field);
8885 if (width != TYPE_PRECISION (type))
8888 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
8889 SET_DECL_MODE (field, TYPE_MODE (TREE_TYPE (field)));
8891 DECL_INITIAL (field) = NULL_TREE;
8893 else if (TYPE_REVERSE_STORAGE_ORDER (t)
8894 && TREE_CODE (field) == FIELD_DECL
8895 && TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE)
8897 tree ftype = TREE_TYPE (field);
8898 tree ctype = strip_array_types (ftype);
8899 if (!RECORD_OR_UNION_TYPE_P (ctype) && TYPE_MODE (ctype) != QImode)
8901 tree fmain_type = TYPE_MAIN_VARIANT (ftype);
8902 tree *typep = &fmain_type;
8904 *typep = build_distinct_type_copy (*typep);
8905 TYPE_REVERSE_STORAGE_ORDER (*typep) = 1;
8906 typep = &TREE_TYPE (*typep);
8907 } while (TREE_CODE (*typep) == ARRAY_TYPE);
8909 = c_build_qualified_type (fmain_type, TYPE_QUALS (ftype));
8913 /* Warn on problematic type punning for storage order purposes. */
8914 if (TREE_CODE (t) == UNION_TYPE
8915 && TREE_CODE (field) == FIELD_DECL
8916 && AGGREGATE_TYPE_P (TREE_TYPE (field)))
8918 tree ftype = TREE_TYPE (field);
8919 if (TREE_CODE (ftype) == ARRAY_TYPE)
8920 ftype = strip_array_types (ftype);
8921 if (RECORD_OR_UNION_TYPE_P (ftype)
8922 && TYPE_REVERSE_STORAGE_ORDER (ftype)
8923 != TYPE_REVERSE_STORAGE_ORDER (t))
8924 warning_at (DECL_SOURCE_LOCATION (field),
8925 OPT_Wscalar_storage_order,
8926 "type punning toggles scalar storage order");
8930 /* Now we have the truly final field list.
8931 Store it in this type and in the variants. */
8933 TYPE_FIELDS (t) = fieldlist;
8935 /* If there are lots of fields, sort so we can look through them fast.
8936 We arbitrarily consider 16 or more elts to be "a lot". */
8941 for (x = fieldlist; x; x = DECL_CHAIN (x))
8943 if (len > 15 || DECL_NAME (x) == NULL)
8951 struct lang_type *space;
8952 struct sorted_fields_type *space2;
8954 len += list_length (x);
8956 /* Use the same allocation policy here that make_node uses, to
8957 ensure that this lives as long as the rest of the struct decl.
8958 All decls in an inline function need to be saved. */
8960 space = ggc_cleared_alloc<struct lang_type> ();
8961 space2 = (sorted_fields_type *) ggc_internal_alloc
8962 (sizeof (struct sorted_fields_type) + len * sizeof (tree));
8966 field_array = &space2->elts[0];
8967 for (x = fieldlist; x; x = DECL_CHAIN (x))
8969 field_array[len++] = x;
8971 /* If there is anonymous struct or union, break out of the loop. */
8972 if (DECL_NAME (x) == NULL)
8975 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
8978 TYPE_LANG_SPECIFIC (t) = space;
8979 TYPE_LANG_SPECIFIC (t)->s->len = len;
8980 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
8981 qsort (field_array, len, sizeof (tree), field_decl_cmp);
8986 /* If this was supposed to be a transparent union, but we can't
8987 make it one, warn and turn off the flag. */
8988 if (TREE_CODE (t) == UNION_TYPE
8989 && TYPE_TRANSPARENT_AGGR (t)
8990 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
8992 TYPE_TRANSPARENT_AGGR (t) = 0;
8993 warning_at (loc, 0, "union cannot be made transparent");
8996 tree incomplete_vars = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
8997 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
8999 TYPE_FIELDS (x) = TYPE_FIELDS (t);
9000 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
9001 TYPE_TRANSPARENT_AGGR (x) = TYPE_TRANSPARENT_AGGR (t);
9002 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
9003 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
9004 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
9005 C_TYPE_INCOMPLETE_VARS (x) = NULL_TREE;
9008 /* Update type location to the one of the definition, instead of e.g.
9009 a forward declaration. */
9010 if (TYPE_STUB_DECL (t))
9011 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
9013 /* Finish debugging output for this type. */
9014 rest_of_type_compilation (t, toplevel);
9016 finish_incomplete_vars (incomplete_vars, toplevel);
9018 /* If we're inside a function proper, i.e. not file-scope and not still
9019 parsing parameters, then arrange for the size of a variable sized type
9021 if (building_stmt_list_p () && variably_modified_type_p (t, NULL_TREE))
9022 add_stmt (build_stmt (loc,
9023 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
9025 if (warn_cxx_compat)
9026 warn_cxx_compat_finish_struct (fieldlist, TREE_CODE (t), loc);
9028 delete struct_parse_info;
9030 struct_parse_info = enclosing_struct_parse_info;
9032 /* If this struct is defined inside a struct, add it to
9035 && struct_parse_info != NULL
9036 && !in_sizeof && !in_typeof && !in_alignof)
9037 struct_parse_info->struct_types.safe_push (t);
9043 gt_pointer_operator new_value;
9047 /* This routine compares two fields like field_decl_cmp but using the
9048 pointer operator in resort_data. */
9051 resort_field_decl_cmp (const void *x_p, const void *y_p)
9053 const tree *const x = (const tree *) x_p;
9054 const tree *const y = (const tree *) y_p;
9056 if (DECL_NAME (*x) == DECL_NAME (*y))
9057 /* A nontype is "greater" than a type. */
9058 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL);
9059 if (DECL_NAME (*x) == NULL_TREE)
9061 if (DECL_NAME (*y) == NULL_TREE)
9064 tree d1 = DECL_NAME (*x);
9065 tree d2 = DECL_NAME (*y);
9066 resort_data.new_value (&d1, &d1, resort_data.cookie);
9067 resort_data.new_value (&d2, &d2, resort_data.cookie);
9074 /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */
9077 resort_sorted_fields (void *obj,
9078 void * ARG_UNUSED (orig_obj),
9079 gt_pointer_operator new_value,
9082 struct sorted_fields_type *sf = (struct sorted_fields_type *) obj;
9083 resort_data.new_value = new_value;
9084 resort_data.cookie = cookie;
9085 qsort (&sf->elts[0], sf->len, sizeof (tree),
9086 resort_field_decl_cmp);
9089 /* Lay out the type T, and its element type, and so on. */
9092 layout_array_type (tree t)
9094 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
9095 layout_array_type (TREE_TYPE (t));
9099 /* Begin compiling the definition of an enumeration type.
9100 NAME is its name (or null if anonymous).
9101 LOC is the enum's location.
9102 Returns the type object, as yet incomplete.
9103 Also records info about it so that build_enumerator
9104 may be used to declare the individual values as they are read. */
9107 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
9109 tree enumtype = NULL_TREE;
9110 location_t enumloc = UNKNOWN_LOCATION;
9112 /* If this is the real definition for a previous forward reference,
9113 fill in the contents in the same object that used to be the
9114 forward reference. */
9116 if (name != NULL_TREE)
9117 enumtype = lookup_tag (ENUMERAL_TYPE, name, true, &enumloc);
9119 if (enumtype == NULL_TREE || TREE_CODE (enumtype) != ENUMERAL_TYPE)
9121 enumtype = make_node (ENUMERAL_TYPE);
9122 pushtag (loc, name, enumtype);
9124 /* Update type location to the one of the definition, instead of e.g.
9125 a forward declaration. */
9126 else if (TYPE_STUB_DECL (enumtype))
9128 enumloc = DECL_SOURCE_LOCATION (TYPE_STUB_DECL (enumtype));
9129 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (enumtype)) = loc;
9132 if (C_TYPE_BEING_DEFINED (enumtype))
9133 error_at (loc, "nested redefinition of %<enum %E%>", name);
9135 C_TYPE_BEING_DEFINED (enumtype) = 1;
9137 if (TYPE_VALUES (enumtype) != NULL_TREE)
9139 /* This enum is a named one that has been declared already. */
9140 auto_diagnostic_group d;
9141 error_at (loc, "redeclaration of %<enum %E%>", name);
9142 if (enumloc != UNKNOWN_LOCATION)
9143 inform (enumloc, "originally defined here");
9145 /* Completely replace its old definition.
9146 The old enumerators remain defined, however. */
9147 TYPE_VALUES (enumtype) = NULL_TREE;
9150 the_enum->enum_next_value = integer_zero_node;
9151 the_enum->enum_overflow = 0;
9153 if (flag_short_enums)
9154 for (tree v = TYPE_MAIN_VARIANT (enumtype); v; v = TYPE_NEXT_VARIANT (v))
9155 TYPE_PACKED (v) = 1;
9157 /* FIXME: This will issue a warning for a use of a type defined
9158 within sizeof in a statement expr. This is not terribly serious
9159 as C++ doesn't permit statement exprs within sizeof anyhow. */
9160 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
9161 warning_at (loc, OPT_Wc___compat,
9162 "defining type in %qs expression is invalid in C++",
9165 : (in_typeof ? "typeof" : "alignof")));
9170 /* After processing and defining all the values of an enumeration type,
9171 install their decls in the enumeration type and finish it off.
9172 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
9173 and ATTRIBUTES are the specified attributes.
9174 Returns ENUMTYPE. */
9177 finish_enum (tree enumtype, tree values, tree attributes)
9180 tree minnode = NULL_TREE, maxnode = NULL_TREE;
9183 bool toplevel = (file_scope == current_scope);
9184 struct lang_type *lt;
9186 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
9188 /* Calculate the maximum value of any enumerator in this type. */
9190 if (values == error_mark_node)
9191 minnode = maxnode = integer_zero_node;
9194 minnode = maxnode = TREE_VALUE (values);
9195 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
9197 tree value = TREE_VALUE (pair);
9198 if (tree_int_cst_lt (maxnode, value))
9200 if (tree_int_cst_lt (value, minnode))
9205 /* Construct the final type of this enumeration. It is the same
9206 as one of the integral types - the narrowest one that fits, except
9207 that normally we only go as narrow as int - and signed iff any of
9208 the values are negative. */
9209 sign = (tree_int_cst_sgn (minnode) >= 0) ? UNSIGNED : SIGNED;
9210 precision = MAX (tree_int_cst_min_precision (minnode, sign),
9211 tree_int_cst_min_precision (maxnode, sign));
9213 /* If the precision of the type was specified with an attribute and it
9214 was too small, give an error. Otherwise, use it. */
9215 if (TYPE_PRECISION (enumtype) && lookup_attribute ("mode", attributes))
9217 if (precision > TYPE_PRECISION (enumtype))
9219 TYPE_PRECISION (enumtype) = 0;
9220 error ("specified mode too small for enumerated values");
9223 precision = TYPE_PRECISION (enumtype);
9226 TYPE_PRECISION (enumtype) = 0;
9228 if (TYPE_PACKED (enumtype)
9229 || precision > TYPE_PRECISION (integer_type_node)
9230 || TYPE_PRECISION (enumtype))
9232 tem = c_common_type_for_size (precision, sign == UNSIGNED ? 1 : 0);
9235 warning (0, "enumeration values exceed range of largest integer");
9236 tem = long_long_integer_type_node;
9240 tem = sign == UNSIGNED ? unsigned_type_node : integer_type_node;
9242 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
9243 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
9244 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
9245 SET_TYPE_ALIGN (enumtype, TYPE_ALIGN (tem));
9246 TYPE_SIZE (enumtype) = NULL_TREE;
9247 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
9249 layout_type (enumtype);
9251 if (values != error_mark_node)
9253 /* Change the type of the enumerators to be the enum type. We
9254 need to do this irrespective of the size of the enum, for
9255 proper type checking. Replace the DECL_INITIALs of the
9256 enumerators, and the value slots of the list, with copies
9257 that have the enum type; they cannot be modified in place
9258 because they may be shared (e.g. integer_zero_node) Finally,
9259 change the purpose slots to point to the names of the decls. */
9260 for (pair = values; pair; pair = TREE_CHAIN (pair))
9262 tree enu = TREE_PURPOSE (pair);
9263 tree ini = DECL_INITIAL (enu);
9265 TREE_TYPE (enu) = enumtype;
9267 /* The ISO C Standard mandates enumerators to have type int,
9268 even though the underlying type of an enum type is
9269 unspecified. However, GCC allows enumerators of any
9270 integer type as an extensions. build_enumerator()
9271 converts any enumerators that fit in an int to type int,
9272 to avoid promotions to unsigned types when comparing
9273 integers with enumerators that fit in the int range.
9274 When -pedantic is given, build_enumerator() would have
9275 already warned about those that don't fit. Here we
9276 convert the rest to the enumerator type. */
9277 if (TREE_TYPE (ini) != integer_type_node)
9278 ini = convert (enumtype, ini);
9280 DECL_INITIAL (enu) = ini;
9281 TREE_PURPOSE (pair) = DECL_NAME (enu);
9282 /* To match the C++ FE, store the CONST_DECL rather than just its
9284 TREE_VALUE (pair) = enu;
9287 TYPE_VALUES (enumtype) = values;
9290 /* Record the min/max values so that we can warn about bit-field
9291 enumerations that are too small for the values. */
9292 lt = ggc_cleared_alloc<struct lang_type> ();
9293 lt->enum_min = minnode;
9294 lt->enum_max = maxnode;
9295 TYPE_LANG_SPECIFIC (enumtype) = lt;
9297 /* Fix up all variant types of this enum type. */
9298 tree incomplete_vars = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (enumtype));
9299 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
9301 C_TYPE_INCOMPLETE_VARS (tem) = NULL_TREE;
9302 if (tem == enumtype)
9304 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
9305 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
9306 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
9307 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
9308 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
9309 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
9310 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
9311 SET_TYPE_ALIGN (tem, TYPE_ALIGN (enumtype));
9312 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
9313 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
9314 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
9317 /* Finish debugging output for this type. */
9318 rest_of_type_compilation (enumtype, toplevel);
9320 finish_incomplete_vars (incomplete_vars, toplevel);
9322 /* If this enum is defined inside a struct, add it to
9325 && struct_parse_info != NULL
9326 && !in_sizeof && !in_typeof && !in_alignof)
9327 struct_parse_info->struct_types.safe_push (enumtype);
9329 C_TYPE_BEING_DEFINED (enumtype) = 0;
9334 /* Build and install a CONST_DECL for one value of the
9335 current enumeration type (one that was begun with start_enum).
9336 DECL_LOC is the location of the enumerator.
9337 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
9338 Return a tree-list containing the CONST_DECL and its value.
9339 Assignment of sequential values by default is handled here. */
9342 build_enumerator (location_t decl_loc, location_t loc,
9343 struct c_enum_contents *the_enum, tree name, tree value)
9347 /* Validate and default VALUE. */
9349 if (value != NULL_TREE)
9351 /* Don't issue more errors for error_mark_node (i.e. an
9352 undeclared identifier) - just ignore the value expression. */
9353 if (value == error_mark_node)
9355 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
9357 error_at (loc, "enumerator value for %qE is not an integer constant",
9363 if (TREE_CODE (value) != INTEGER_CST)
9365 value = c_fully_fold (value, false, NULL);
9366 if (TREE_CODE (value) == INTEGER_CST)
9367 pedwarn (loc, OPT_Wpedantic,
9368 "enumerator value for %qE is not an integer "
9369 "constant expression", name);
9371 if (TREE_CODE (value) != INTEGER_CST)
9373 error ("enumerator value for %qE is not an integer constant",
9379 value = default_conversion (value);
9380 constant_expression_warning (value);
9385 /* Default based on previous value. */
9386 /* It should no longer be possible to have NON_LVALUE_EXPR
9388 if (value == NULL_TREE)
9390 value = the_enum->enum_next_value;
9391 if (the_enum->enum_overflow)
9392 error_at (loc, "overflow in enumeration values");
9394 /* Even though the underlying type of an enum is unspecified, the
9395 type of enumeration constants is explicitly defined as int
9396 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
9398 else if (!int_fits_type_p (value, integer_type_node))
9399 pedwarn (loc, OPT_Wpedantic,
9400 "ISO C restricts enumerator values to range of %<int%>");
9402 /* The ISO C Standard mandates enumerators to have type int, even
9403 though the underlying type of an enum type is unspecified.
9404 However, GCC allows enumerators of any integer type as an
9405 extensions. Here we convert any enumerators that fit in an int
9406 to type int, to avoid promotions to unsigned types when comparing
9407 integers with enumerators that fit in the int range. When
9408 -pedantic is given, we would have already warned about those that
9409 don't fit. We have to do this here rather than in finish_enum
9410 because this value may be used to define more enumerators. */
9411 if (int_fits_type_p (value, integer_type_node))
9412 value = convert (integer_type_node, value);
9414 /* Set basis for default for next value. */
9415 the_enum->enum_next_value
9416 = build_binary_op (EXPR_LOC_OR_LOC (value, input_location),
9417 PLUS_EXPR, value, integer_one_node, false);
9418 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
9420 /* Now create a declaration for the enum value name. */
9422 type = TREE_TYPE (value);
9423 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
9424 TYPE_PRECISION (integer_type_node)),
9425 (TYPE_PRECISION (type)
9426 >= TYPE_PRECISION (integer_type_node)
9427 && TYPE_UNSIGNED (type)));
9429 decl = build_decl (decl_loc, CONST_DECL, name, type);
9430 DECL_INITIAL (decl) = convert (type, value);
9433 return tree_cons (decl, value, NULL_TREE);
9436 /* Implement LANG_HOOKS_SIMULATE_ENUM_DECL. */
9439 c_simulate_enum_decl (location_t loc, const char *name,
9440 vec<string_int_pair> *values_ptr)
9442 location_t saved_loc = input_location;
9443 input_location = loc;
9445 struct c_enum_contents the_enum;
9446 tree enumtype = start_enum (loc, &the_enum, get_identifier (name));
9448 tree value_chain = NULL_TREE;
9449 string_int_pair *value;
9450 vec<string_int_pair> values = *values_ptr;
9452 FOR_EACH_VEC_ELT (values, i, value)
9454 tree decl = build_enumerator (loc, loc, &the_enum,
9455 get_identifier (value->first),
9456 build_int_cst (integer_type_node,
9458 TREE_CHAIN (decl) = value_chain;
9462 finish_enum (enumtype, nreverse (value_chain), NULL_TREE);
9464 input_location = saved_loc;
9468 /* Implement LANG_HOOKS_SIMULATE_RECORD_DECL. */
9471 c_simulate_record_decl (location_t loc, const char *name,
9472 array_slice<const tree> fields)
9474 location_t saved_loc = input_location;
9475 input_location = loc;
9477 class c_struct_parse_info *struct_info;
9478 tree ident = get_identifier (name);
9479 tree type = start_struct (loc, RECORD_TYPE, ident, &struct_info);
9481 for (unsigned int i = 0; i < fields.size (); ++i)
9483 DECL_FIELD_CONTEXT (fields[i]) = type;
9485 DECL_CHAIN (fields[i - 1]) = fields[i];
9488 finish_struct (loc, type, fields[0], NULL_TREE, struct_info);
9490 tree decl = build_decl (loc, TYPE_DECL, ident, type);
9491 set_underlying_type (decl);
9492 lang_hooks.decls.pushdecl (decl);
9494 input_location = saved_loc;
9498 /* Create the FUNCTION_DECL for a function definition.
9499 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
9500 the declaration; they describe the function's name and the type it returns,
9501 but twisted together in a fashion that parallels the syntax of C.
9503 This function creates a binding context for the function body
9504 as well as setting up the FUNCTION_DECL in current_function_decl.
9506 Returns true on success. If the DECLARATOR is not suitable for a function
9507 (it defines a datum instead), we return false to report a parse error. */
9510 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
9513 tree decl1, old_decl;
9514 tree restype, resdecl;
9517 current_function_returns_value = 0; /* Assume, until we see it does. */
9518 current_function_returns_null = 0;
9519 current_function_returns_abnormally = 0;
9520 warn_about_return_type = 0;
9521 c_switch_stack = NULL;
9523 /* Indicate no valid break/continue context. */
9526 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
9527 &attributes, NULL, NULL, DEPRECATED_NORMAL);
9528 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION, decl1);
9530 /* If the declarator is not suitable for a function definition,
9531 cause a syntax error. */
9532 if (decl1 == NULL_TREE
9533 || TREE_CODE (decl1) != FUNCTION_DECL)
9536 loc = DECL_SOURCE_LOCATION (decl1);
9538 /* A nested function is not global. */
9539 if (current_function_decl != NULL_TREE)
9540 TREE_PUBLIC (decl1) = 0;
9542 c_decl_attributes (&decl1, attributes, 0);
9544 if (DECL_DECLARED_INLINE_P (decl1)
9545 && DECL_UNINLINABLE (decl1)
9546 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
9547 warning_at (loc, OPT_Wattributes,
9548 "inline function %qD given attribute %qs",
9551 /* Handle gnu_inline attribute. */
9552 if (declspecs->inline_p
9553 && !flag_gnu89_inline
9554 && TREE_CODE (decl1) == FUNCTION_DECL
9555 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
9556 || current_function_decl))
9558 if (declspecs->storage_class != csc_static)
9559 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
9562 announce_function (decl1);
9564 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
9566 error_at (loc, "return type is an incomplete type");
9567 /* Make it return void instead. */
9569 = build_function_type (void_type_node,
9570 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
9573 if (warn_about_return_type)
9574 warn_defaults_to (loc, flag_isoc99 ? OPT_Wimplicit_int
9575 : (warn_return_type > 0 ? OPT_Wreturn_type
9576 : OPT_Wimplicit_int),
9577 "return type defaults to %<int%>");
9579 /* Make the init_value nonzero so pushdecl knows this is not tentative.
9580 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
9581 DECL_INITIAL (decl1) = error_mark_node;
9583 /* If this definition isn't a prototype and we had a prototype declaration
9584 before, copy the arg type info from that prototype. */
9585 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
9586 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
9587 old_decl = NULL_TREE;
9589 current_function_prototype_locus = UNKNOWN_LOCATION;
9590 current_function_prototype_built_in = false;
9591 current_function_prototype_arg_types = NULL_TREE;
9592 tree newtype = TREE_TYPE (decl1);
9593 tree oldtype = old_decl ? TREE_TYPE (old_decl) : newtype;
9594 if (!prototype_p (newtype))
9596 tree oldrt = TREE_TYPE (oldtype);
9597 tree newrt = TREE_TYPE (newtype);
9598 if (old_decl != NULL_TREE
9599 && TREE_CODE (oldtype) == FUNCTION_TYPE
9600 && comptypes (oldrt, newrt))
9602 if (stdarg_p (oldtype))
9604 auto_diagnostic_group d;
9605 warning_at (loc, 0, "%q+D defined as variadic function "
9606 "without prototype", decl1);
9607 locate_old_decl (old_decl);
9609 TREE_TYPE (decl1) = composite_type (oldtype, newtype);
9610 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
9611 current_function_prototype_built_in
9612 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
9613 current_function_prototype_arg_types
9614 = TYPE_ARG_TYPES (newtype);
9616 if (TREE_PUBLIC (decl1))
9618 /* If there is an external prototype declaration of this
9619 function, record its location but do not copy information
9620 to this decl. This may be an invisible declaration
9621 (built-in or in a scope which has finished) or simply
9622 have more refined argument types than any declaration
9624 struct c_binding *b;
9625 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
9626 if (B_IN_SCOPE (b, external_scope))
9630 tree ext_decl, ext_type;
9632 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
9633 if (TREE_CODE (ext_type) == FUNCTION_TYPE
9634 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
9635 TREE_TYPE (ext_type)))
9637 current_function_prototype_locus
9638 = DECL_SOURCE_LOCATION (ext_decl);
9639 current_function_prototype_built_in
9640 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
9641 current_function_prototype_arg_types
9642 = TYPE_ARG_TYPES (ext_type);
9648 /* Optionally warn of old-fashioned def with no previous prototype. */
9649 if (warn_strict_prototypes
9650 && old_decl != error_mark_node
9651 && !prototype_p (TREE_TYPE (decl1))
9652 && C_DECL_ISNT_PROTOTYPE (old_decl))
9653 warning_at (loc, OPT_Wstrict_prototypes,
9654 "function declaration isn%'t a prototype");
9655 /* Optionally warn of any global def with no previous prototype. */
9656 else if (warn_missing_prototypes
9657 && old_decl != error_mark_node
9658 && TREE_PUBLIC (decl1)
9659 && !MAIN_NAME_P (DECL_NAME (decl1))
9660 && C_DECL_ISNT_PROTOTYPE (old_decl)
9661 && !DECL_DECLARED_INLINE_P (decl1))
9662 warning_at (loc, OPT_Wmissing_prototypes,
9663 "no previous prototype for %qD", decl1);
9664 /* Optionally warn of any def with no previous prototype
9665 if the function has already been used. */
9666 else if (warn_missing_prototypes
9667 && old_decl != NULL_TREE
9668 && old_decl != error_mark_node
9669 && TREE_USED (old_decl)
9670 && !prototype_p (TREE_TYPE (old_decl)))
9671 warning_at (loc, OPT_Wmissing_prototypes,
9672 "%qD was used with no prototype before its definition", decl1);
9673 /* Optionally warn of any global def with no previous declaration. */
9674 else if (warn_missing_declarations
9675 && TREE_PUBLIC (decl1)
9676 && old_decl == NULL_TREE
9677 && !MAIN_NAME_P (DECL_NAME (decl1))
9678 && !DECL_DECLARED_INLINE_P (decl1))
9679 warning_at (loc, OPT_Wmissing_declarations,
9680 "no previous declaration for %qD",
9682 /* Optionally warn of any def with no previous declaration
9683 if the function has already been used. */
9684 else if (warn_missing_declarations
9685 && old_decl != NULL_TREE
9686 && old_decl != error_mark_node
9687 && TREE_USED (old_decl)
9688 && C_DECL_IMPLICIT (old_decl))
9689 warning_at (loc, OPT_Wmissing_declarations,
9690 "%qD was used with no declaration before its definition", decl1);
9692 /* This function exists in static storage.
9693 (This does not mean `static' in the C sense!) */
9694 TREE_STATIC (decl1) = 1;
9696 /* This is the earliest point at which we might know the assembler
9697 name of the function. Thus, if it's set before this, die horribly. */
9698 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
9700 /* If #pragma weak was used, mark the decl weak now. */
9701 if (current_scope == file_scope)
9702 maybe_apply_pragma_weak (decl1);
9704 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
9705 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
9707 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
9708 != integer_type_node)
9709 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
9710 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1))))
9711 pedwarn (loc, OPT_Wmain, "%<_Atomic%>-qualified return type of %qD",
9714 check_main_parameter_types (decl1);
9716 if (!TREE_PUBLIC (decl1))
9717 pedwarn (loc, OPT_Wmain,
9718 "%qD is normally a non-static function", decl1);
9721 tree parms = current_function_arg_info->parms;
9724 location_t origloc = DECL_SOURCE_LOCATION (old_decl);
9725 warn_parm_array_mismatch (origloc, old_decl, parms);
9728 /* Record the decl so that the function name is defined.
9729 If we already have a decl for this name, and it is a FUNCTION_DECL,
9730 use the old decl. */
9732 current_function_decl = pushdecl (decl1);
9734 if (tree access = build_attr_access_from_parms (parms, false))
9735 decl_attributes (¤t_function_decl, access, ATTR_FLAG_INTERNAL,
9739 declare_parm_level ();
9741 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
9742 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
9743 DECL_ARTIFICIAL (resdecl) = 1;
9744 DECL_IGNORED_P (resdecl) = 1;
9745 DECL_RESULT (current_function_decl) = resdecl;
9747 start_fname_decls ();
9752 /* Subroutine of store_parm_decls which handles new-style function
9753 definitions (prototype format). The parms already have decls, so we
9754 need only record them as in effect and complain if any redundant
9755 old-style parm decls were written. */
9757 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
9763 if (current_scope->bindings)
9765 error_at (DECL_SOURCE_LOCATION (fndecl),
9766 "old-style parameter declarations in prototyped "
9767 "function definition");
9769 /* Get rid of the old-style declarations. */
9773 /* Don't issue this warning for nested functions, and don't issue this
9774 warning if we got here because ARG_INFO_TYPES was error_mark_node
9775 (this happens when a function definition has just an ellipsis in
9776 its parameter list). */
9777 else if (!in_system_header_at (input_location)
9778 && !current_function_scope
9779 && arg_info->types != error_mark_node)
9780 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
9781 "traditional C rejects ISO C style function definitions");
9783 /* Now make all the parameter declarations visible in the function body.
9784 We can bypass most of the grunt work of pushdecl. */
9785 for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl))
9787 DECL_CONTEXT (decl) = current_function_decl;
9788 if (DECL_NAME (decl))
9790 bind (DECL_NAME (decl), decl, current_scope,
9791 /*invisible=*/false, /*nested=*/false,
9793 if (!TREE_USED (decl))
9794 warn_if_shadowing (decl);
9797 pedwarn_c11 (DECL_SOURCE_LOCATION (decl), OPT_Wpedantic,
9798 "ISO C does not support omitting parameter names in "
9799 "function definitions before C2X");
9802 /* Record the parameter list in the function declaration. */
9803 DECL_ARGUMENTS (fndecl) = arg_info->parms;
9805 /* Now make all the ancillary declarations visible, likewise. */
9806 for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl))
9808 DECL_CONTEXT (decl) = current_function_decl;
9809 if (DECL_NAME (decl))
9810 bind (DECL_NAME (decl), decl, current_scope,
9811 /*invisible=*/false,
9812 /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL),
9816 /* And all the tag declarations. */
9817 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
9819 bind (tag->id, tag->type, current_scope,
9820 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
9823 /* Subroutine of store_parm_decls which handles old-style function
9824 definitions (separate parameter list and declarations). */
9827 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
9829 struct c_binding *b;
9830 tree parm, decl, last;
9831 tree parmids = arg_info->parms;
9832 hash_set<tree> seen_args;
9834 if (!in_system_header_at (input_location))
9837 pedwarn (DECL_SOURCE_LOCATION (fndecl),
9838 OPT_Wold_style_definition, "old-style function definition");
9840 warning_at (DECL_SOURCE_LOCATION (fndecl),
9841 OPT_Wold_style_definition,
9842 "old-style function definition");
9845 if (current_scope->had_vla_unspec)
9846 error ("%<[*]%> not allowed in other than function prototype scope");
9848 /* Match each formal parameter name with its declaration. Save each
9849 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
9850 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
9852 if (TREE_VALUE (parm) == NULL_TREE)
9854 error_at (DECL_SOURCE_LOCATION (fndecl),
9855 "parameter name missing from parameter list");
9856 TREE_PURPOSE (parm) = NULL_TREE;
9860 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
9861 if (b && B_IN_CURRENT_SCOPE (b))
9864 /* Skip erroneous parameters. */
9865 if (decl == error_mark_node)
9867 /* If we got something other than a PARM_DECL it is an error. */
9868 if (TREE_CODE (decl) != PARM_DECL)
9870 error_at (DECL_SOURCE_LOCATION (decl),
9871 "%qD declared as a non-parameter", decl);
9874 /* If the declaration is already marked, we have a duplicate
9875 name. Complain and ignore the duplicate. */
9876 else if (seen_args.contains (decl))
9878 error_at (DECL_SOURCE_LOCATION (decl),
9879 "multiple parameters named %qD", decl);
9880 TREE_PURPOSE (parm) = NULL_TREE;
9883 /* If the declaration says "void", complain and turn it into
9885 else if (VOID_TYPE_P (TREE_TYPE (decl)))
9887 error_at (DECL_SOURCE_LOCATION (decl),
9888 "parameter %qD declared with void type", decl);
9889 TREE_TYPE (decl) = integer_type_node;
9890 DECL_ARG_TYPE (decl) = integer_type_node;
9891 layout_decl (decl, 0);
9893 warn_if_shadowing (decl);
9895 /* If no declaration found, default to int. */
9898 /* FIXME diagnostics: This should be the location of the argument,
9899 not the FNDECL. E.g., for an old-style declaration
9901 int f10(v) { blah; }
9903 We should use the location of the V, not the F10.
9904 Unfortunately, the V is an IDENTIFIER_NODE which has no
9905 location. In the future we need locations for c_arg_info
9908 See gcc.dg/Wshadow-3.c for an example of this problem. */
9909 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
9910 PARM_DECL, TREE_VALUE (parm), integer_type_node);
9911 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
9913 warn_if_shadowing (decl);
9916 pedwarn (DECL_SOURCE_LOCATION (decl),
9917 OPT_Wimplicit_int, "type of %qD defaults to %<int%>",
9920 warning_at (DECL_SOURCE_LOCATION (decl),
9921 OPT_Wmissing_parameter_type,
9922 "type of %qD defaults to %<int%>", decl);
9925 TREE_PURPOSE (parm) = decl;
9926 seen_args.add (decl);
9929 /* Now examine the parms chain for incomplete declarations
9930 and declarations with no corresponding names. */
9932 for (b = current_scope->bindings; b; b = b->prev)
9935 if (TREE_CODE (parm) != PARM_DECL)
9938 if (TREE_TYPE (parm) != error_mark_node
9939 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
9941 error_at (DECL_SOURCE_LOCATION (parm),
9942 "parameter %qD has incomplete type", parm);
9943 TREE_TYPE (parm) = error_mark_node;
9946 if (!seen_args.contains (parm))
9948 error_at (DECL_SOURCE_LOCATION (parm),
9949 "declaration for parameter %qD but no such parameter",
9952 /* Pretend the parameter was not missing.
9953 This gets us to a standard state and minimizes
9954 further error messages. */
9955 parmids = chainon (parmids, tree_cons (parm, 0, 0));
9959 /* Chain the declarations together in the order of the list of
9960 names. Store that chain in the function decl, replacing the
9961 list of names. Update the current scope to match. */
9962 DECL_ARGUMENTS (fndecl) = NULL_TREE;
9964 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
9965 if (TREE_PURPOSE (parm))
9967 if (parm && TREE_PURPOSE (parm))
9969 last = TREE_PURPOSE (parm);
9970 DECL_ARGUMENTS (fndecl) = last;
9972 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
9973 if (TREE_PURPOSE (parm))
9975 DECL_CHAIN (last) = TREE_PURPOSE (parm);
9976 last = TREE_PURPOSE (parm);
9978 DECL_CHAIN (last) = NULL_TREE;
9981 /* If there was a previous prototype,
9982 set the DECL_ARG_TYPE of each argument according to
9983 the type previously specified, and report any mismatches. */
9985 if (current_function_prototype_arg_types)
9988 for (parm = DECL_ARGUMENTS (fndecl),
9989 type = current_function_prototype_arg_types;
9990 parm || (type != NULL_TREE
9991 && TREE_VALUE (type) != error_mark_node
9992 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
9993 parm = DECL_CHAIN (parm), type = TREE_CHAIN (type))
9995 if (parm == NULL_TREE
9996 || type == NULL_TREE
9997 || (TREE_VALUE (type) != error_mark_node
9998 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node))
10000 if (current_function_prototype_built_in)
10001 warning_at (DECL_SOURCE_LOCATION (fndecl),
10002 0, "number of arguments doesn%'t match "
10003 "built-in prototype");
10006 /* FIXME diagnostics: This should be the location of
10007 FNDECL, but there is bug when a prototype is
10008 declared inside function context, but defined
10009 outside of it (e.g., gcc.dg/pr15698-2.c). In
10010 which case FNDECL gets the location of the
10011 prototype, not the definition. */
10012 error_at (input_location,
10013 "number of arguments doesn%'t match prototype");
10015 error_at (current_function_prototype_locus,
10016 "prototype declaration");
10020 /* Type for passing arg must be consistent with that
10021 declared for the arg. ISO C says we take the unqualified
10022 type for parameters declared with qualified type. */
10023 if (TREE_TYPE (parm) != error_mark_node
10024 && TREE_VALUE (type) != error_mark_node
10025 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
10026 != TYPE_ATOMIC (TREE_VALUE (type)))
10027 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
10028 TYPE_MAIN_VARIANT (TREE_VALUE (type)))))
10030 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
10031 == TYPE_ATOMIC (TREE_VALUE (type)))
10032 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
10033 == TYPE_MAIN_VARIANT (TREE_VALUE (type))))
10035 /* Adjust argument to match prototype. E.g. a previous
10036 `int foo(float);' prototype causes
10037 `int foo(x) float x; {...}' to be treated like
10038 `int foo(float x) {...}'. This is particularly
10039 useful for argument types like uid_t. */
10040 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
10042 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
10043 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
10044 && (TYPE_PRECISION (TREE_TYPE (parm))
10045 < TYPE_PRECISION (integer_type_node)))
10046 DECL_ARG_TYPE (parm)
10047 = c_type_promotes_to (TREE_TYPE (parm));
10049 /* ??? Is it possible to get here with a
10050 built-in prototype or will it always have
10051 been diagnosed as conflicting with an
10052 old-style definition and discarded? */
10053 if (current_function_prototype_built_in)
10054 warning_at (DECL_SOURCE_LOCATION (parm),
10055 OPT_Wpedantic, "promoted argument %qD "
10056 "doesn%'t match built-in prototype", parm);
10059 pedwarn (DECL_SOURCE_LOCATION (parm),
10060 OPT_Wpedantic, "promoted argument %qD "
10061 "doesn%'t match prototype", parm);
10062 pedwarn (current_function_prototype_locus, OPT_Wpedantic,
10063 "prototype declaration");
10068 if (current_function_prototype_built_in)
10069 warning_at (DECL_SOURCE_LOCATION (parm),
10070 0, "argument %qD doesn%'t match "
10071 "built-in prototype", parm);
10074 error_at (DECL_SOURCE_LOCATION (parm),
10075 "argument %qD doesn%'t match prototype", parm);
10076 error_at (current_function_prototype_locus,
10077 "prototype declaration");
10082 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = NULL_TREE;
10085 /* Otherwise, create a prototype that would match. */
10089 tree actual = NULL_TREE, last = NULL_TREE, type;
10091 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm))
10093 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
10095 TREE_CHAIN (last) = type;
10100 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
10102 TREE_CHAIN (last) = type;
10106 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
10107 of the type of this function, but we need to avoid having this
10108 affect the types of other similarly-typed functions, so we must
10109 first force the generation of an identical (but separate) type
10110 node for the relevant function type. The new node we create
10111 will be a variant of the main variant of the original function
10114 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
10116 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
10120 /* Store parameter declarations passed in ARG_INFO into the current
10121 function declaration. */
10124 store_parm_decls_from (struct c_arg_info *arg_info)
10126 current_function_arg_info = arg_info;
10127 store_parm_decls ();
10130 /* Called by walk_tree to look for and update context-less labels
10131 or labels with context in the parent function. */
10134 set_labels_context_r (tree *tp, int *walk_subtrees, void *data)
10136 tree ctx = static_cast<tree>(data);
10137 if (TREE_CODE (*tp) == LABEL_EXPR
10138 && (DECL_CONTEXT (LABEL_EXPR_LABEL (*tp)) == NULL_TREE
10139 || DECL_CONTEXT (LABEL_EXPR_LABEL (*tp)) == DECL_CONTEXT (ctx)))
10141 DECL_CONTEXT (LABEL_EXPR_LABEL (*tp)) = ctx;
10142 *walk_subtrees = 0;
10148 /* Store the parameter declarations into the current function declaration.
10149 This is called after parsing the parameter declarations, before
10150 digesting the body of the function.
10152 For an old-style definition, construct a prototype out of the old-style
10153 parameter declarations and inject it into the function's type. */
10156 store_parm_decls (void)
10158 tree fndecl = current_function_decl;
10161 /* The argument information block for FNDECL. */
10162 struct c_arg_info *arg_info = current_function_arg_info;
10163 current_function_arg_info = 0;
10165 /* True if this definition is written with a prototype. In C2X, an
10166 empty argument list was converted to (void) in grokparms; in
10167 older C standard versions, it does not give the function a type
10168 with a prototype for future calls. */
10169 proto = arg_info->types != 0;
10172 store_parm_decls_newstyle (fndecl, arg_info);
10174 store_parm_decls_oldstyle (fndecl, arg_info);
10176 /* The next call to push_scope will be a function body. */
10178 next_is_function_body = true;
10180 /* Write a record describing this function definition to the prototypes
10181 file (if requested). */
10183 gen_aux_info_record (fndecl, 1, 0, proto);
10185 /* Initialize the RTL code for the function. */
10186 allocate_struct_function (fndecl, false);
10188 if (warn_unused_local_typedefs)
10189 cfun->language = ggc_cleared_alloc<language_function> ();
10191 /* Begin the statement tree for this function. */
10192 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
10194 /* ??? Insert the contents of the pending sizes list into the function
10195 to be evaluated. The only reason left to have this is
10196 void foo(int n, int array[n++])
10197 because we throw away the array type in favor of a pointer type, and
10198 thus won't naturally see the SAVE_EXPR containing the increment. All
10199 other pending sizes would be handled by gimplify_parameters. */
10200 if (arg_info->pending_sizes)
10202 /* In very special circumstances, e.g. for code like
10204 void f (int a[i += 2]) {}
10205 we need to execute the atomic assignment on function entry.
10206 But in this case, it is not just a straight store, it has the
10207 op= form, which means that build_atomic_assign has generated
10208 gotos, labels, etc. Because at that time the function decl
10209 for F has not been created yet, those labels do not have any
10210 function context. But we have the fndecl now, so update the
10211 labels accordingly. gimplify_expr would crash otherwise.
10212 Or with nested functions the labels could be created with parent
10213 function's context, while when the statement is emitted at the
10214 start of the nested function, it needs the nested function's
10216 walk_tree_without_duplicates (&arg_info->pending_sizes,
10217 set_labels_context_r, fndecl);
10218 add_stmt (arg_info->pending_sizes);
10222 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
10223 c_finish_omp_declare_simd for function prototypes. No diagnostics
10227 temp_store_parm_decls (tree fndecl, tree parms)
10230 for (tree p = parms; p; p = DECL_CHAIN (p))
10232 DECL_CONTEXT (p) = fndecl;
10234 bind (DECL_NAME (p), p, current_scope,
10235 /*invisible=*/false, /*nested=*/false,
10240 /* Undo what temp_store_parm_decls did. */
10243 temp_pop_parm_decls (void)
10245 /* Clear all bindings in this temporary scope, so that
10246 pop_scope doesn't create a BLOCK. */
10247 struct c_binding *b = current_scope->bindings;
10248 current_scope->bindings = NULL;
10249 for (; b; b = free_binding_and_advance (b))
10251 gcc_assert (TREE_CODE (b->decl) == PARM_DECL
10252 || b->decl == error_mark_node);
10253 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
10254 I_SYMBOL_BINDING (b->id) = b->shadowed;
10255 if (b->shadowed && b->shadowed->u.type)
10256 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
10262 /* Finish up a function declaration and compile that function
10263 all the way to assembler language output. Then free the storage
10264 for the function definition.
10266 This is called after parsing the body of the function definition. */
10269 finish_function (location_t end_loc)
10271 tree fndecl = current_function_decl;
10273 if (c_dialect_objc ())
10274 objc_finish_function ();
10276 if (TREE_CODE (fndecl) == FUNCTION_DECL
10277 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
10279 tree args = DECL_ARGUMENTS (fndecl);
10280 for (; args; args = DECL_CHAIN (args))
10282 tree type = TREE_TYPE (args);
10283 if (INTEGRAL_TYPE_P (type)
10284 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
10285 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
10289 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
10290 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
10292 /* Must mark the RESULT_DECL as being in this function. */
10294 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
10295 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
10297 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
10298 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
10299 == integer_type_node && flag_isoc99)
10301 /* Hack. We don't want the middle-end to warn that this return
10302 is unreachable, so we mark its location as special. Using
10303 UNKNOWN_LOCATION has the problem that it gets clobbered in
10304 annotate_one_with_locus. A cleaner solution might be to
10305 ensure ! should_carry_locus_p (stmt), but that needs a flag.
10307 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
10310 /* Tie off the statement tree for this function. */
10311 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
10313 finish_fname_decls ();
10315 /* Complain if there's no return statement only if option specified on
10317 if (warn_return_type > 0
10318 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
10319 && !current_function_returns_value && !current_function_returns_null
10320 /* Don't complain if we are no-return. */
10321 && !current_function_returns_abnormally
10322 /* Don't complain if we are declared noreturn. */
10323 && !TREE_THIS_VOLATILE (fndecl)
10324 /* Don't warn for main(). */
10325 && !MAIN_NAME_P (DECL_NAME (fndecl))
10326 /* Or if they didn't actually specify a return type. */
10327 && !C_FUNCTION_IMPLICIT_INT (fndecl)
10328 /* Normally, with -Wreturn-type, flow will complain, but we might
10329 optimize out static functions. */
10330 && !TREE_PUBLIC (fndecl)
10331 && targetm.warn_func_return (fndecl)
10332 && warning (OPT_Wreturn_type,
10333 "no return statement in function returning non-void"))
10334 suppress_warning (fndecl, OPT_Wreturn_type);
10336 /* Complain about parameters that are only set, but never otherwise used. */
10337 if (warn_unused_but_set_parameter)
10341 for (decl = DECL_ARGUMENTS (fndecl);
10343 decl = DECL_CHAIN (decl))
10344 if (TREE_USED (decl)
10345 && TREE_CODE (decl) == PARM_DECL
10346 && !DECL_READ_P (decl)
10347 && DECL_NAME (decl)
10348 && !DECL_ARTIFICIAL (decl)
10349 && !warning_suppressed_p (decl, OPT_Wunused_but_set_parameter))
10350 warning_at (DECL_SOURCE_LOCATION (decl),
10351 OPT_Wunused_but_set_parameter,
10352 "parameter %qD set but not used", decl);
10355 /* Complain about locally defined typedefs that are not used in this
10357 maybe_warn_unused_local_typedefs ();
10359 /* Possibly warn about unused parameters. */
10360 if (warn_unused_parameter)
10361 do_warn_unused_parameter (fndecl);
10363 /* Store the end of the function, so that we get good line number
10364 info for the epilogue. */
10365 cfun->function_end_locus = end_loc;
10367 /* Finalize the ELF visibility for the function. */
10368 c_determine_visibility (fndecl);
10370 /* For GNU C extern inline functions disregard inline limits. */
10371 if (DECL_EXTERNAL (fndecl)
10372 && DECL_DECLARED_INLINE_P (fndecl)
10373 && (flag_gnu89_inline
10374 || lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (fndecl))))
10375 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
10377 /* Genericize before inlining. Delay genericizing nested functions
10378 until their parent function is genericized. Since finalizing
10379 requires GENERIC, delay that as well. */
10381 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
10382 && !undef_nested_function)
10384 if (!decl_function_context (fndecl))
10386 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
10387 c_genericize (fndecl);
10389 /* ??? Objc emits functions after finalizing the compilation unit.
10390 This should be cleaned up later and this conditional removed. */
10391 if (symtab->global_info_ready)
10393 cgraph_node::add_new_function (fndecl, false);
10396 cgraph_node::finalize_function (fndecl, false);
10400 /* Register this function with cgraph just far enough to get it
10401 added to our parent's nested function list. Handy, since the
10402 C front end doesn't have such a list. */
10403 (void) cgraph_node::get_create (fndecl);
10407 if (!decl_function_context (fndecl))
10408 undef_nested_function = false;
10410 if (cfun->language != NULL)
10412 ggc_free (cfun->language);
10413 cfun->language = NULL;
10416 /* We're leaving the context of this function, so zap cfun.
10417 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
10418 tree_rest_of_compilation. */
10420 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION, current_function_decl);
10421 current_function_decl = NULL;
10424 /* Check the declarations given in a for-loop for satisfying the C99
10425 constraints. If exactly one such decl is found, return it. LOC is
10426 the location of the opening parenthesis of the for loop. The last
10427 parameter allows you to control the "for loop initial declarations
10428 are only allowed in C99 mode". Normally, you should pass
10429 flag_isoc99 as that parameter. But in some cases (Objective-C
10430 foreach loop, for example) we want to run the checks in this
10431 function even if not in C99 mode, so we allow the caller to turn
10432 off the error about not being in C99 mode.
10436 check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error)
10438 struct c_binding *b;
10439 tree one_decl = NULL_TREE;
10442 if (!turn_off_iso_c99_error)
10444 static bool hint = true;
10445 /* If we get here, declarations have been used in a for loop without
10446 the C99 for loop scope. This doesn't make much sense, so don't
10448 auto_diagnostic_group d;
10449 error_at (loc, "%<for%> loop initial declarations "
10450 "are only allowed in C99 or C11 mode");
10454 "use option %<-std=c99%>, %<-std=gnu99%>, %<-std=c11%> or "
10455 "%<-std=gnu11%> to compile your code");
10461 pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not support %<for%> loop "
10462 "initial declarations");
10464 /* C99 subclause 6.8.5 paragraph 3:
10466 [#3] The declaration part of a for statement shall only
10467 declare identifiers for objects having storage class auto or
10470 It isn't clear whether, in this sentence, "identifiers" binds to
10471 "shall only declare" or to "objects" - that is, whether all identifiers
10472 declared must be identifiers for objects, or whether the restriction
10473 only applies to those that are. (A question on this in comp.std.c
10474 in November 2000 received no answer.) We implement the strictest
10475 interpretation, to avoid creating an extension which later causes
10478 for (b = current_scope->bindings; b; b = b->prev)
10481 tree decl = b->decl;
10486 switch (TREE_CODE (decl))
10490 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
10491 if (TREE_STATIC (decl))
10492 error_at (decl_loc,
10493 "declaration of static variable %qD in %<for%> loop "
10494 "initial declaration", decl);
10495 else if (DECL_EXTERNAL (decl))
10496 error_at (decl_loc,
10497 "declaration of %<extern%> variable %qD in %<for%> loop "
10498 "initial declaration", decl);
10504 "%<struct %E%> declared in %<for%> loop initial "
10505 "declaration", id);
10509 "%<union %E%> declared in %<for%> loop initial declaration",
10512 case ENUMERAL_TYPE:
10513 error_at (loc, "%<enum %E%> declared in %<for%> loop "
10514 "initial declaration", id);
10517 error_at (loc, "declaration of non-variable "
10518 "%qD in %<for%> loop initial declaration", decl);
10525 return n_decls == 1 ? one_decl : NULL_TREE;
10528 /* Save and reinitialize the variables
10529 used during compilation of a C function. */
10532 c_push_function_context (void)
10534 struct language_function *p = cfun->language;
10535 /* cfun->language might have been already allocated by the use of
10536 -Wunused-local-typedefs. In that case, just re-use it. */
10538 cfun->language = p = ggc_cleared_alloc<language_function> ();
10540 p->base.x_stmt_tree = c_stmt_tree;
10541 c_stmt_tree.x_cur_stmt_list = vec_safe_copy (c_stmt_tree.x_cur_stmt_list);
10542 p->x_in_statement = in_statement;
10543 p->x_switch_stack = c_switch_stack;
10544 p->arg_info = current_function_arg_info;
10545 p->returns_value = current_function_returns_value;
10546 p->returns_null = current_function_returns_null;
10547 p->returns_abnormally = current_function_returns_abnormally;
10548 p->warn_about_return_type = warn_about_return_type;
10550 push_function_context ();
10553 /* Restore the variables used during compilation of a C function. */
10556 c_pop_function_context (void)
10558 struct language_function *p;
10560 pop_function_context ();
10561 p = cfun->language;
10563 /* When -Wunused-local-typedefs is in effect, cfun->languages is
10564 used to store data throughout the life time of the current cfun,
10565 So don't deallocate it. */
10566 if (!warn_unused_local_typedefs)
10567 cfun->language = NULL;
10569 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
10570 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
10572 /* Stop pointing to the local nodes about to be freed. */
10573 /* But DECL_INITIAL must remain nonzero so we know this
10574 was an actual function definition. */
10575 DECL_INITIAL (current_function_decl) = error_mark_node;
10576 DECL_ARGUMENTS (current_function_decl) = NULL_TREE;
10579 c_stmt_tree = p->base.x_stmt_tree;
10580 p->base.x_stmt_tree.x_cur_stmt_list = NULL;
10581 in_statement = p->x_in_statement;
10582 c_switch_stack = p->x_switch_stack;
10583 current_function_arg_info = p->arg_info;
10584 current_function_returns_value = p->returns_value;
10585 current_function_returns_null = p->returns_null;
10586 current_function_returns_abnormally = p->returns_abnormally;
10587 warn_about_return_type = p->warn_about_return_type;
10590 /* The functions below are required for functionality of doing
10591 function at once processing in the C front end. Currently these
10592 functions are not called from anywhere in the C front end, but as
10593 these changes continue, that will change. */
10595 /* Returns the stmt_tree (if any) to which statements are currently
10596 being added. If there is no active statement-tree, NULL is
10600 current_stmt_tree (void)
10602 return &c_stmt_tree;
10605 /* Return the global value of T as a symbol. */
10608 identifier_global_value (tree t)
10610 struct c_binding *b;
10612 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
10613 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
10619 /* Return the global value of tag T as a symbol. */
10622 identifier_global_tag (tree t)
10624 struct c_binding *b;
10626 for (b = I_TAG_BINDING (t); b; b = b->shadowed)
10627 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
10633 /* Returns true if NAME refers to a built-in function or function-like
10637 names_builtin_p (const char *name)
10639 tree id = get_identifier (name);
10640 if (tree decl = identifier_global_value (id))
10641 return TREE_CODE (decl) == FUNCTION_DECL && DECL_IS_UNDECLARED_BUILTIN (decl);
10643 /* Also detect common reserved C words that aren't strictly built-in
10645 switch (C_RID_CODE (id))
10647 case RID_BUILTIN_CONVERTVECTOR:
10648 case RID_BUILTIN_HAS_ATTRIBUTE:
10649 case RID_BUILTIN_SHUFFLE:
10650 case RID_BUILTIN_SHUFFLEVECTOR:
10651 case RID_BUILTIN_ASSOC_BARRIER:
10652 case RID_CHOOSE_EXPR:
10654 case RID_TYPES_COMPATIBLE_P:
10663 /* In C, the only C-linkage public declaration is at file scope. */
10666 c_linkage_bindings (tree name)
10668 return identifier_global_value (name);
10671 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
10672 otherwise the name is found in ridpointers from RID_INDEX. */
10675 record_builtin_type (enum rid rid_index, const char *name, tree type)
10679 id = ridpointers[(int) rid_index];
10681 id = get_identifier (name);
10682 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
10684 if (debug_hooks->type_decl)
10685 debug_hooks->type_decl (decl, false);
10688 /* Build the void_list_node (void_type_node having been created). */
10690 build_void_list_node (void)
10692 tree t = build_tree_list (NULL_TREE, void_type_node);
10696 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
10699 build_c_parm (struct c_declspecs *specs, tree attrs,
10700 struct c_declarator *declarator,
10703 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
10704 ret->specs = specs;
10705 ret->attrs = attrs;
10706 ret->declarator = declarator;
10711 /* Return a declarator with nested attributes. TARGET is the inner
10712 declarator to which these attributes apply. ATTRS are the
10715 struct c_declarator *
10716 build_attrs_declarator (tree attrs, struct c_declarator *target)
10718 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
10719 ret->kind = cdk_attrs;
10720 ret->declarator = target;
10721 ret->u.attrs = attrs;
10725 /* Return a declarator for a function with arguments specified by ARGS
10726 and return type specified by TARGET. */
10728 struct c_declarator *
10729 build_function_declarator (struct c_arg_info *args,
10730 struct c_declarator *target)
10732 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
10733 ret->kind = cdk_function;
10734 ret->declarator = target;
10735 ret->u.arg_info = args;
10739 /* Return a declarator for the identifier IDENT (which may be
10740 NULL_TREE for an abstract declarator). */
10742 struct c_declarator *
10743 build_id_declarator (tree ident)
10745 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
10746 ret->kind = cdk_id;
10747 ret->declarator = 0;
10748 ret->u.id.id = ident;
10749 ret->u.id.attrs = NULL_TREE;
10750 /* Default value - may get reset to a more precise location. */
10751 ret->id_loc = input_location;
10755 /* Return something to represent absolute declarators containing a *.
10756 TARGET is the absolute declarator that the * contains.
10757 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
10758 to apply to the pointer type. */
10760 struct c_declarator *
10761 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
10762 struct c_declarator *target)
10766 struct c_declarator *itarget = target;
10767 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
10768 if (type_quals_attrs)
10770 attrs = type_quals_attrs->attrs;
10771 quals = quals_from_declspecs (type_quals_attrs);
10772 if (attrs != NULL_TREE)
10773 itarget = build_attrs_declarator (attrs, target);
10775 ret->kind = cdk_pointer;
10776 ret->declarator = itarget;
10777 ret->u.pointer_quals = quals;
10781 /* Return a pointer to a structure for an empty list of declaration
10784 struct c_declspecs *
10785 build_null_declspecs (void)
10787 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
10788 memset (ret, 0, sizeof *ret);
10789 ret->align_log = -1;
10790 ret->typespec_word = cts_none;
10791 ret->storage_class = csc_none;
10792 ret->expr_const_operands = true;
10793 ret->typespec_kind = ctsk_none;
10794 ret->address_space = ADDR_SPACE_GENERIC;
10798 /* Add the address space ADDRSPACE to the declaration specifiers
10799 SPECS, returning SPECS. */
10801 struct c_declspecs *
10802 declspecs_add_addrspace (location_t location,
10803 struct c_declspecs *specs, addr_space_t as)
10805 specs->non_sc_seen_p = true;
10806 specs->declspecs_seen_p = true;
10807 specs->non_std_attrs_seen_p = true;
10809 if (!ADDR_SPACE_GENERIC_P (specs->address_space)
10810 && specs->address_space != as)
10811 error ("incompatible address space qualifiers %qs and %qs",
10812 c_addr_space_name (as),
10813 c_addr_space_name (specs->address_space));
10816 specs->address_space = as;
10817 specs->locations[cdw_address_space] = location;
10822 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
10823 returning SPECS. */
10825 struct c_declspecs *
10826 declspecs_add_qual (location_t loc,
10827 struct c_declspecs *specs, tree qual)
10831 specs->non_sc_seen_p = true;
10832 specs->declspecs_seen_p = true;
10833 specs->non_std_attrs_seen_p = true;
10834 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
10835 && C_IS_RESERVED_WORD (qual));
10836 i = C_RID_CODE (qual);
10837 location_t prev_loc = UNKNOWN_LOCATION;
10841 dupe = specs->const_p;
10842 specs->const_p = true;
10843 prev_loc = specs->locations[cdw_const];
10844 specs->locations[cdw_const] = loc;
10847 dupe = specs->volatile_p;
10848 specs->volatile_p = true;
10849 prev_loc = specs->locations[cdw_volatile];
10850 specs->locations[cdw_volatile] = loc;
10853 dupe = specs->restrict_p;
10854 specs->restrict_p = true;
10855 prev_loc = specs->locations[cdw_restrict];
10856 specs->locations[cdw_restrict] = loc;
10859 dupe = specs->atomic_p;
10860 specs->atomic_p = true;
10861 prev_loc = specs->locations[cdw_atomic];
10862 specs->locations[cdw_atomic] = loc;
10865 gcc_unreachable ();
10869 bool warned = pedwarn_c90 (loc, OPT_Wpedantic,
10870 "duplicate %qE declaration specifier", qual);
10872 && warn_duplicate_decl_specifier
10873 && prev_loc >= RESERVED_LOCATION_COUNT
10874 && !from_macro_expansion_at (prev_loc)
10875 && !from_macro_expansion_at (loc))
10876 warning_at (loc, OPT_Wduplicate_decl_specifier,
10877 "duplicate %qE declaration specifier", qual);
10882 /* Add the type specifier TYPE to the declaration specifiers SPECS,
10883 returning SPECS. */
10885 struct c_declspecs *
10886 declspecs_add_type (location_t loc, struct c_declspecs *specs,
10887 struct c_typespec spec)
10889 tree type = spec.spec;
10890 specs->non_sc_seen_p = true;
10891 specs->declspecs_seen_p = true;
10892 specs->non_std_attrs_seen_p = true;
10893 specs->typespec_kind = spec.kind;
10894 if (TREE_DEPRECATED (type))
10895 specs->deprecated_p = true;
10896 if (TREE_UNAVAILABLE (type))
10897 specs->unavailable_p = true;
10899 /* Handle type specifier keywords. */
10900 if (TREE_CODE (type) == IDENTIFIER_NODE
10901 && C_IS_RESERVED_WORD (type)
10902 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
10904 enum rid i = C_RID_CODE (type);
10907 error_at (loc, "two or more data types in declaration specifiers");
10910 if ((int) i <= (int) RID_LAST_MODIFIER)
10912 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
10917 if (specs->long_long_p)
10919 error_at (loc, "%<long long long%> is too long for GCC");
10924 if (specs->typespec_word == cts_double)
10927 ("both %<long long%> and %<double%> in "
10928 "declaration specifiers"));
10931 pedwarn_c90 (loc, OPT_Wlong_long,
10932 "ISO C90 does not support %<long long%>");
10933 specs->long_long_p = 1;
10934 specs->locations[cdw_long_long] = loc;
10937 if (specs->short_p)
10939 ("both %<long%> and %<short%> in "
10940 "declaration specifiers"));
10941 else if (specs->typespec_word == cts_auto_type)
10943 ("both %<long%> and %<__auto_type%> in "
10944 "declaration specifiers"));
10945 else if (specs->typespec_word == cts_void)
10947 ("both %<long%> and %<void%> in "
10948 "declaration specifiers"));
10949 else if (specs->typespec_word == cts_int_n)
10951 ("both %<long%> and %<__int%d%> in "
10952 "declaration specifiers"),
10953 int_n_data[specs->int_n_idx].bitsize);
10954 else if (specs->typespec_word == cts_bool)
10956 ("both %<long%> and %<_Bool%> in "
10957 "declaration specifiers"));
10958 else if (specs->typespec_word == cts_char)
10960 ("both %<long%> and %<char%> in "
10961 "declaration specifiers"));
10962 else if (specs->typespec_word == cts_float)
10964 ("both %<long%> and %<float%> in "
10965 "declaration specifiers"));
10966 else if (specs->typespec_word == cts_floatn_nx)
10968 ("both %<long%> and %<_Float%d%s%> in "
10969 "declaration specifiers"),
10970 floatn_nx_types[specs->floatn_nx_idx].n,
10971 (floatn_nx_types[specs->floatn_nx_idx].extended
10974 else if (specs->typespec_word == cts_dfloat32)
10976 ("both %<long%> and %<_Decimal32%> in "
10977 "declaration specifiers"));
10978 else if (specs->typespec_word == cts_dfloat64)
10980 ("both %<long%> and %<_Decimal64%> in "
10981 "declaration specifiers"));
10982 else if (specs->typespec_word == cts_dfloat128)
10984 ("both %<long%> and %<_Decimal128%> in "
10985 "declaration specifiers"));
10988 specs->long_p = true;
10989 specs->locations[cdw_long] = loc;
10993 dupe = specs->short_p;
10996 ("both %<long%> and %<short%> in "
10997 "declaration specifiers"));
10998 else if (specs->typespec_word == cts_auto_type)
11000 ("both %<short%> and %<__auto_type%> in "
11001 "declaration specifiers"));
11002 else if (specs->typespec_word == cts_void)
11004 ("both %<short%> and %<void%> in "
11005 "declaration specifiers"));
11006 else if (specs->typespec_word == cts_int_n)
11008 ("both %<short%> and %<__int%d%> in "
11009 "declaration specifiers"),
11010 int_n_data[specs->int_n_idx].bitsize);
11011 else if (specs->typespec_word == cts_bool)
11013 ("both %<short%> and %<_Bool%> in "
11014 "declaration specifiers"));
11015 else if (specs->typespec_word == cts_char)
11017 ("both %<short%> and %<char%> in "
11018 "declaration specifiers"));
11019 else if (specs->typespec_word == cts_float)
11021 ("both %<short%> and %<float%> in "
11022 "declaration specifiers"));
11023 else if (specs->typespec_word == cts_double)
11025 ("both %<short%> and %<double%> in "
11026 "declaration specifiers"));
11027 else if (specs->typespec_word == cts_floatn_nx)
11029 ("both %<short%> and %<_Float%d%s%> in "
11030 "declaration specifiers"),
11031 floatn_nx_types[specs->floatn_nx_idx].n,
11032 (floatn_nx_types[specs->floatn_nx_idx].extended
11035 else if (specs->typespec_word == cts_dfloat32)
11037 ("both %<short%> and %<_Decimal32%> in "
11038 "declaration specifiers"));
11039 else if (specs->typespec_word == cts_dfloat64)
11041 ("both %<short%> and %<_Decimal64%> in "
11042 "declaration specifiers"));
11043 else if (specs->typespec_word == cts_dfloat128)
11045 ("both %<short%> and %<_Decimal128%> in "
11046 "declaration specifiers"));
11049 specs->short_p = true;
11050 specs->locations[cdw_short] = loc;
11054 dupe = specs->signed_p;
11055 if (specs->unsigned_p)
11057 ("both %<signed%> and %<unsigned%> in "
11058 "declaration specifiers"));
11059 else if (specs->typespec_word == cts_auto_type)
11061 ("both %<signed%> and %<__auto_type%> in "
11062 "declaration specifiers"));
11063 else if (specs->typespec_word == cts_void)
11065 ("both %<signed%> and %<void%> in "
11066 "declaration specifiers"));
11067 else if (specs->typespec_word == cts_bool)
11069 ("both %<signed%> and %<_Bool%> in "
11070 "declaration specifiers"));
11071 else if (specs->typespec_word == cts_float)
11073 ("both %<signed%> and %<float%> in "
11074 "declaration specifiers"));
11075 else if (specs->typespec_word == cts_double)
11077 ("both %<signed%> and %<double%> in "
11078 "declaration specifiers"));
11079 else if (specs->typespec_word == cts_floatn_nx)
11081 ("both %<signed%> and %<_Float%d%s%> in "
11082 "declaration specifiers"),
11083 floatn_nx_types[specs->floatn_nx_idx].n,
11084 (floatn_nx_types[specs->floatn_nx_idx].extended
11087 else if (specs->typespec_word == cts_dfloat32)
11089 ("both %<signed%> and %<_Decimal32%> in "
11090 "declaration specifiers"));
11091 else if (specs->typespec_word == cts_dfloat64)
11093 ("both %<signed%> and %<_Decimal64%> in "
11094 "declaration specifiers"));
11095 else if (specs->typespec_word == cts_dfloat128)
11097 ("both %<signed%> and %<_Decimal128%> in "
11098 "declaration specifiers"));
11101 specs->signed_p = true;
11102 specs->locations[cdw_signed] = loc;
11106 dupe = specs->unsigned_p;
11107 if (specs->signed_p)
11109 ("both %<signed%> and %<unsigned%> in "
11110 "declaration specifiers"));
11111 else if (specs->typespec_word == cts_auto_type)
11113 ("both %<unsigned%> and %<__auto_type%> in "
11114 "declaration specifiers"));
11115 else if (specs->typespec_word == cts_void)
11117 ("both %<unsigned%> and %<void%> in "
11118 "declaration specifiers"));
11119 else if (specs->typespec_word == cts_bool)
11121 ("both %<unsigned%> and %<_Bool%> in "
11122 "declaration specifiers"));
11123 else if (specs->typespec_word == cts_float)
11125 ("both %<unsigned%> and %<float%> in "
11126 "declaration specifiers"));
11127 else if (specs->typespec_word == cts_double)
11129 ("both %<unsigned%> and %<double%> in "
11130 "declaration specifiers"));
11131 else if (specs->typespec_word == cts_floatn_nx)
11133 ("both %<unsigned%> and %<_Float%d%s%> in "
11134 "declaration specifiers"),
11135 floatn_nx_types[specs->floatn_nx_idx].n,
11136 (floatn_nx_types[specs->floatn_nx_idx].extended
11139 else if (specs->typespec_word == cts_dfloat32)
11141 ("both %<unsigned%> and %<_Decimal32%> in "
11142 "declaration specifiers"));
11143 else if (specs->typespec_word == cts_dfloat64)
11145 ("both %<unsigned%> and %<_Decimal64%> in "
11146 "declaration specifiers"));
11147 else if (specs->typespec_word == cts_dfloat128)
11149 ("both %<unsigned%> and %<_Decimal128%> in "
11150 "declaration specifiers"));
11153 specs->unsigned_p = true;
11154 specs->locations[cdw_unsigned] = loc;
11158 dupe = specs->complex_p;
11159 if (!in_system_header_at (loc))
11160 pedwarn_c90 (loc, OPT_Wpedantic,
11161 "ISO C90 does not support complex types");
11162 if (specs->typespec_word == cts_auto_type)
11164 ("both %<complex%> and %<__auto_type%> in "
11165 "declaration specifiers"));
11166 else if (specs->typespec_word == cts_void)
11168 ("both %<complex%> and %<void%> in "
11169 "declaration specifiers"));
11170 else if (specs->typespec_word == cts_bool)
11172 ("both %<complex%> and %<_Bool%> in "
11173 "declaration specifiers"));
11174 else if (specs->typespec_word == cts_dfloat32)
11176 ("both %<complex%> and %<_Decimal32%> in "
11177 "declaration specifiers"));
11178 else if (specs->typespec_word == cts_dfloat64)
11180 ("both %<complex%> and %<_Decimal64%> in "
11181 "declaration specifiers"));
11182 else if (specs->typespec_word == cts_dfloat128)
11184 ("both %<complex%> and %<_Decimal128%> in "
11185 "declaration specifiers"));
11186 else if (specs->typespec_word == cts_fract)
11188 ("both %<complex%> and %<_Fract%> in "
11189 "declaration specifiers"));
11190 else if (specs->typespec_word == cts_accum)
11192 ("both %<complex%> and %<_Accum%> in "
11193 "declaration specifiers"));
11194 else if (specs->saturating_p)
11196 ("both %<complex%> and %<_Sat%> in "
11197 "declaration specifiers"));
11200 specs->complex_p = true;
11201 specs->locations[cdw_complex] = loc;
11205 dupe = specs->saturating_p;
11206 pedwarn (loc, OPT_Wpedantic,
11207 "ISO C does not support saturating types");
11208 if (specs->typespec_word == cts_int_n)
11211 ("both %<_Sat%> and %<__int%d%> in "
11212 "declaration specifiers"),
11213 int_n_data[specs->int_n_idx].bitsize);
11215 else if (specs->typespec_word == cts_auto_type)
11217 ("both %<_Sat%> and %<__auto_type%> in "
11218 "declaration specifiers"));
11219 else if (specs->typespec_word == cts_void)
11221 ("both %<_Sat%> and %<void%> in "
11222 "declaration specifiers"));
11223 else if (specs->typespec_word == cts_bool)
11225 ("both %<_Sat%> and %<_Bool%> in "
11226 "declaration specifiers"));
11227 else if (specs->typespec_word == cts_char)
11229 ("both %<_Sat%> and %<char%> in "
11230 "declaration specifiers"));
11231 else if (specs->typespec_word == cts_int)
11233 ("both %<_Sat%> and %<int%> in "
11234 "declaration specifiers"));
11235 else if (specs->typespec_word == cts_float)
11237 ("both %<_Sat%> and %<float%> in "
11238 "declaration specifiers"));
11239 else if (specs->typespec_word == cts_double)
11241 ("both %<_Sat%> and %<double%> in "
11242 "declaration specifiers"));
11243 else if (specs->typespec_word == cts_floatn_nx)
11245 ("both %<_Sat%> and %<_Float%d%s%> in "
11246 "declaration specifiers"),
11247 floatn_nx_types[specs->floatn_nx_idx].n,
11248 (floatn_nx_types[specs->floatn_nx_idx].extended
11251 else if (specs->typespec_word == cts_dfloat32)
11253 ("both %<_Sat%> and %<_Decimal32%> in "
11254 "declaration specifiers"));
11255 else if (specs->typespec_word == cts_dfloat64)
11257 ("both %<_Sat%> and %<_Decimal64%> in "
11258 "declaration specifiers"));
11259 else if (specs->typespec_word == cts_dfloat128)
11261 ("both %<_Sat%> and %<_Decimal128%> in "
11262 "declaration specifiers"));
11263 else if (specs->complex_p)
11265 ("both %<_Sat%> and %<complex%> in "
11266 "declaration specifiers"));
11269 specs->saturating_p = true;
11270 specs->locations[cdw_saturating] = loc;
11274 gcc_unreachable ();
11278 error_at (loc, "duplicate %qE", type);
11284 /* "void", "_Bool", "char", "int", "float", "double",
11285 "_FloatN", "_FloatNx", "_Decimal32", "__intN",
11286 "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
11288 if (specs->typespec_word != cts_none)
11291 "two or more data types in declaration specifiers");
11296 case RID_AUTO_TYPE:
11299 ("both %<long%> and %<__auto_type%> in "
11300 "declaration specifiers"));
11301 else if (specs->short_p)
11303 ("both %<short%> and %<__auto_type%> in "
11304 "declaration specifiers"));
11305 else if (specs->signed_p)
11307 ("both %<signed%> and %<__auto_type%> in "
11308 "declaration specifiers"));
11309 else if (specs->unsigned_p)
11311 ("both %<unsigned%> and %<__auto_type%> in "
11312 "declaration specifiers"));
11313 else if (specs->complex_p)
11315 ("both %<complex%> and %<__auto_type%> in "
11316 "declaration specifiers"));
11317 else if (specs->saturating_p)
11319 ("both %<_Sat%> and %<__auto_type%> in "
11320 "declaration specifiers"));
11323 specs->typespec_word = cts_auto_type;
11324 specs->locations[cdw_typespec] = loc;
11331 specs->int_n_idx = i - RID_INT_N_0;
11332 if (!in_system_header_at (input_location)
11333 /* If the INT_N type ends in "__", and so is of the format
11334 "__intN__", don't pedwarn. */
11335 && (strncmp (IDENTIFIER_POINTER (type)
11336 + (IDENTIFIER_LENGTH (type) - 2), "__", 2) != 0))
11337 pedwarn (loc, OPT_Wpedantic,
11338 "ISO C does not support %<__int%d%> types",
11339 int_n_data[specs->int_n_idx].bitsize);
11343 ("both %<__int%d%> and %<long%> in "
11344 "declaration specifiers"),
11345 int_n_data[specs->int_n_idx].bitsize);
11346 else if (specs->saturating_p)
11348 ("both %<_Sat%> and %<__int%d%> in "
11349 "declaration specifiers"),
11350 int_n_data[specs->int_n_idx].bitsize);
11351 else if (specs->short_p)
11353 ("both %<__int%d%> and %<short%> in "
11354 "declaration specifiers"),
11355 int_n_data[specs->int_n_idx].bitsize);
11356 else if (! int_n_enabled_p[specs->int_n_idx])
11358 specs->typespec_word = cts_int_n;
11360 "%<__int%d%> is not supported on this target",
11361 int_n_data[specs->int_n_idx].bitsize);
11365 specs->typespec_word = cts_int_n;
11366 specs->locations[cdw_typespec] = loc;
11372 ("both %<long%> and %<void%> in "
11373 "declaration specifiers"));
11374 else if (specs->short_p)
11376 ("both %<short%> and %<void%> in "
11377 "declaration specifiers"));
11378 else if (specs->signed_p)
11380 ("both %<signed%> and %<void%> in "
11381 "declaration specifiers"));
11382 else if (specs->unsigned_p)
11384 ("both %<unsigned%> and %<void%> in "
11385 "declaration specifiers"));
11386 else if (specs->complex_p)
11388 ("both %<complex%> and %<void%> in "
11389 "declaration specifiers"));
11390 else if (specs->saturating_p)
11392 ("both %<_Sat%> and %<void%> in "
11393 "declaration specifiers"));
11396 specs->typespec_word = cts_void;
11397 specs->locations[cdw_typespec] = loc;
11401 if (!in_system_header_at (loc))
11402 pedwarn_c90 (loc, OPT_Wpedantic,
11403 "ISO C90 does not support boolean types");
11406 ("both %<long%> and %<_Bool%> in "
11407 "declaration specifiers"));
11408 else if (specs->short_p)
11410 ("both %<short%> and %<_Bool%> in "
11411 "declaration specifiers"));
11412 else if (specs->signed_p)
11414 ("both %<signed%> and %<_Bool%> in "
11415 "declaration specifiers"));
11416 else if (specs->unsigned_p)
11418 ("both %<unsigned%> and %<_Bool%> in "
11419 "declaration specifiers"));
11420 else if (specs->complex_p)
11422 ("both %<complex%> and %<_Bool%> in "
11423 "declaration specifiers"));
11424 else if (specs->saturating_p)
11426 ("both %<_Sat%> and %<_Bool%> in "
11427 "declaration specifiers"));
11430 specs->typespec_word = cts_bool;
11431 specs->locations[cdw_typespec] = loc;
11437 ("both %<long%> and %<char%> in "
11438 "declaration specifiers"));
11439 else if (specs->short_p)
11441 ("both %<short%> and %<char%> in "
11442 "declaration specifiers"));
11443 else if (specs->saturating_p)
11445 ("both %<_Sat%> and %<char%> in "
11446 "declaration specifiers"));
11449 specs->typespec_word = cts_char;
11450 specs->locations[cdw_typespec] = loc;
11454 if (specs->saturating_p)
11456 ("both %<_Sat%> and %<int%> in "
11457 "declaration specifiers"));
11460 specs->typespec_word = cts_int;
11461 specs->locations[cdw_typespec] = loc;
11467 ("both %<long%> and %<float%> in "
11468 "declaration specifiers"));
11469 else if (specs->short_p)
11471 ("both %<short%> and %<float%> in "
11472 "declaration specifiers"));
11473 else if (specs->signed_p)
11475 ("both %<signed%> and %<float%> in "
11476 "declaration specifiers"));
11477 else if (specs->unsigned_p)
11479 ("both %<unsigned%> and %<float%> in "
11480 "declaration specifiers"));
11481 else if (specs->saturating_p)
11483 ("both %<_Sat%> and %<float%> in "
11484 "declaration specifiers"));
11487 specs->typespec_word = cts_float;
11488 specs->locations[cdw_typespec] = loc;
11492 if (specs->long_long_p)
11494 ("both %<long long%> and %<double%> in "
11495 "declaration specifiers"));
11496 else if (specs->short_p)
11498 ("both %<short%> and %<double%> in "
11499 "declaration specifiers"));
11500 else if (specs->signed_p)
11502 ("both %<signed%> and %<double%> in "
11503 "declaration specifiers"));
11504 else if (specs->unsigned_p)
11506 ("both %<unsigned%> and %<double%> in "
11507 "declaration specifiers"));
11508 else if (specs->saturating_p)
11510 ("both %<_Sat%> and %<double%> in "
11511 "declaration specifiers"));
11514 specs->typespec_word = cts_double;
11515 specs->locations[cdw_typespec] = loc;
11518 CASE_RID_FLOATN_NX:
11519 specs->floatn_nx_idx = i - RID_FLOATN_NX_FIRST;
11520 if (!in_system_header_at (input_location))
11521 pedwarn (loc, OPT_Wpedantic,
11522 "ISO C does not support the %<_Float%d%s%> type",
11523 floatn_nx_types[specs->floatn_nx_idx].n,
11524 (floatn_nx_types[specs->floatn_nx_idx].extended
11530 ("both %<long%> and %<_Float%d%s%> in "
11531 "declaration specifiers"),
11532 floatn_nx_types[specs->floatn_nx_idx].n,
11533 (floatn_nx_types[specs->floatn_nx_idx].extended
11536 else if (specs->short_p)
11538 ("both %<short%> and %<_Float%d%s%> in "
11539 "declaration specifiers"),
11540 floatn_nx_types[specs->floatn_nx_idx].n,
11541 (floatn_nx_types[specs->floatn_nx_idx].extended
11544 else if (specs->signed_p)
11546 ("both %<signed%> and %<_Float%d%s%> in "
11547 "declaration specifiers"),
11548 floatn_nx_types[specs->floatn_nx_idx].n,
11549 (floatn_nx_types[specs->floatn_nx_idx].extended
11552 else if (specs->unsigned_p)
11554 ("both %<unsigned%> and %<_Float%d%s%> in "
11555 "declaration specifiers"),
11556 floatn_nx_types[specs->floatn_nx_idx].n,
11557 (floatn_nx_types[specs->floatn_nx_idx].extended
11560 else if (specs->saturating_p)
11562 ("both %<_Sat%> and %<_Float%d%s%> in "
11563 "declaration specifiers"),
11564 floatn_nx_types[specs->floatn_nx_idx].n,
11565 (floatn_nx_types[specs->floatn_nx_idx].extended
11568 else if (FLOATN_NX_TYPE_NODE (specs->floatn_nx_idx) == NULL_TREE)
11570 specs->typespec_word = cts_floatn_nx;
11572 "%<_Float%d%s%> is not supported on this target",
11573 floatn_nx_types[specs->floatn_nx_idx].n,
11574 (floatn_nx_types[specs->floatn_nx_idx].extended
11580 specs->typespec_word = cts_floatn_nx;
11581 specs->locations[cdw_typespec] = loc;
11586 case RID_DFLOAT128:
11589 if (i == RID_DFLOAT32)
11590 str = "_Decimal32";
11591 else if (i == RID_DFLOAT64)
11592 str = "_Decimal64";
11594 str = "_Decimal128";
11595 if (specs->long_long_p)
11597 ("both %<long long%> and %qs in "
11598 "declaration specifiers"),
11602 ("both %<long%> and %qs in "
11603 "declaration specifiers"),
11605 else if (specs->short_p)
11607 ("both %<short%> and %qs in "
11608 "declaration specifiers"),
11610 else if (specs->signed_p)
11612 ("both %<signed%> and %qs in "
11613 "declaration specifiers"),
11615 else if (specs->unsigned_p)
11617 ("both %<unsigned%> and %qs in "
11618 "declaration specifiers"),
11620 else if (specs->complex_p)
11622 ("both %<complex%> and %qs in "
11623 "declaration specifiers"),
11625 else if (specs->saturating_p)
11627 ("both %<_Sat%> and %qs in "
11628 "declaration specifiers"),
11630 else if (i == RID_DFLOAT32)
11631 specs->typespec_word = cts_dfloat32;
11632 else if (i == RID_DFLOAT64)
11633 specs->typespec_word = cts_dfloat64;
11635 specs->typespec_word = cts_dfloat128;
11636 specs->locations[cdw_typespec] = loc;
11638 if (!targetm.decimal_float_supported_p ())
11640 ("decimal floating-point not supported "
11641 "for this target"));
11642 pedwarn_c11 (loc, OPT_Wpedantic,
11643 "ISO C does not support decimal floating-point "
11650 if (i == RID_FRACT)
11654 if (specs->complex_p)
11656 ("both %<complex%> and %qs in "
11657 "declaration specifiers"),
11659 else if (i == RID_FRACT)
11660 specs->typespec_word = cts_fract;
11662 specs->typespec_word = cts_accum;
11663 specs->locations[cdw_typespec] = loc;
11665 if (!targetm.fixed_point_supported_p ())
11667 "fixed-point types not supported for this target");
11668 pedwarn (loc, OPT_Wpedantic,
11669 "ISO C does not support fixed-point types");
11672 /* ObjC reserved word "id", handled below. */
11678 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
11679 form of ObjC type, cases such as "int" and "long" being handled
11680 above), a TYPE (struct, union, enum and typeof specifiers) or an
11681 ERROR_MARK. In none of these cases may there have previously
11682 been any type specifiers. */
11683 if (specs->type || specs->typespec_word != cts_none
11684 || specs->long_p || specs->short_p || specs->signed_p
11685 || specs->unsigned_p || specs->complex_p)
11686 error_at (loc, "two or more data types in declaration specifiers");
11687 else if (TREE_CODE (type) == TYPE_DECL)
11689 if (TREE_TYPE (type) == error_mark_node)
11690 ; /* Allow the type to default to int to avoid cascading errors. */
11693 specs->type = TREE_TYPE (type);
11694 specs->decl_attr = DECL_ATTRIBUTES (type);
11695 specs->typedef_p = true;
11696 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
11697 specs->locations[cdw_typedef] = loc;
11699 /* If this typedef name is defined in a struct, then a C++
11700 lookup would return a different value. */
11701 if (warn_cxx_compat
11702 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
11703 warning_at (loc, OPT_Wc___compat,
11704 "C++ lookup of %qD would return a field, not a type",
11707 /* If we are parsing a struct, record that a struct field
11709 if (warn_cxx_compat && struct_parse_info != NULL)
11710 struct_parse_info->typedefs_seen.safe_push (type);
11713 else if (TREE_CODE (type) == IDENTIFIER_NODE)
11715 tree t = lookup_name (type);
11716 if (!t || TREE_CODE (t) != TYPE_DECL)
11717 error_at (loc, "%qE fails to be a typedef or built in type", type);
11718 else if (TREE_TYPE (t) == error_mark_node)
11722 specs->type = TREE_TYPE (t);
11723 specs->locations[cdw_typespec] = loc;
11728 if (TREE_CODE (type) != ERROR_MARK && spec.kind == ctsk_typeof)
11730 specs->typedef_p = true;
11731 specs->locations[cdw_typedef] = loc;
11735 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
11736 specs->expr, spec.expr);
11738 specs->expr = spec.expr;
11739 specs->expr_const_operands &= spec.expr_const_operands;
11742 specs->type = type;
11748 /* Add the storage class specifier or function specifier SCSPEC to the
11749 declaration specifiers SPECS, returning SPECS. */
11751 struct c_declspecs *
11752 declspecs_add_scspec (location_t loc,
11753 struct c_declspecs *specs,
11757 enum c_storage_class n = csc_none;
11759 specs->declspecs_seen_p = true;
11760 specs->non_std_attrs_seen_p = true;
11761 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
11762 && C_IS_RESERVED_WORD (scspec));
11763 i = C_RID_CODE (scspec);
11764 if (specs->non_sc_seen_p)
11765 warning (OPT_Wold_style_declaration,
11766 "%qE is not at beginning of declaration", scspec);
11770 /* C99 permits duplicate inline. Although of doubtful utility,
11771 it seems simplest to permit it in gnu89 mode as well, as
11772 there is also little utility in maintaining this as a
11773 difference between gnu89 and C99 inline. */
11775 specs->inline_p = true;
11776 specs->locations[cdw_inline] = loc;
11779 /* Duplicate _Noreturn is permitted. */
11781 specs->noreturn_p = true;
11782 specs->locations[cdw_noreturn] = loc;
11785 dupe = specs->thread_p;
11786 if (specs->storage_class == csc_auto)
11787 error ("%qE used with %<auto%>", scspec);
11788 else if (specs->storage_class == csc_register)
11789 error ("%qE used with %<register%>", scspec);
11790 else if (specs->storage_class == csc_typedef)
11791 error ("%qE used with %<typedef%>", scspec);
11794 specs->thread_p = true;
11795 specs->thread_gnu_p = (strcmp (IDENTIFIER_POINTER (scspec),
11797 /* A diagnostic is not required for the use of this
11798 identifier in the implementation namespace; only diagnose
11799 it for the C11 spelling because of existing code using
11800 the other spelling. */
11801 if (!specs->thread_gnu_p)
11804 pedwarn_c99 (loc, OPT_Wpedantic,
11805 "ISO C99 does not support %qE", scspec);
11807 pedwarn_c99 (loc, OPT_Wpedantic,
11808 "ISO C90 does not support %qE", scspec);
11810 specs->locations[cdw_thread] = loc;
11818 /* Diagnose "__thread extern". */
11819 if (specs->thread_p && specs->thread_gnu_p)
11820 error ("%<__thread%> before %<extern%>");
11827 /* Diagnose "__thread static". */
11828 if (specs->thread_p && specs->thread_gnu_p)
11829 error ("%<__thread%> before %<static%>");
11835 gcc_unreachable ();
11837 if (n != csc_none && n == specs->storage_class)
11841 if (i == RID_THREAD)
11842 error ("duplicate %<_Thread_local%> or %<__thread%>");
11844 error ("duplicate %qE", scspec);
11848 if (specs->storage_class != csc_none && n != specs->storage_class)
11850 error ("multiple storage classes in declaration specifiers");
11854 specs->storage_class = n;
11855 specs->locations[cdw_storage_class] = loc;
11856 if (n != csc_extern && n != csc_static && specs->thread_p)
11858 error ("%qs used with %qE",
11859 specs->thread_gnu_p ? "__thread" : "_Thread_local",
11861 specs->thread_p = false;
11868 /* Add the attributes ATTRS to the declaration specifiers SPECS,
11869 returning SPECS. */
11871 struct c_declspecs *
11872 declspecs_add_attrs (location_t loc, struct c_declspecs *specs, tree attrs)
11874 specs->attrs = chainon (attrs, specs->attrs);
11875 specs->locations[cdw_attributes] = loc;
11876 specs->declspecs_seen_p = true;
11877 /* In the case of standard attributes at the start of the
11878 declaration, the caller will reset this. */
11879 specs->non_std_attrs_seen_p = true;
11883 /* Add an _Alignas specifier (expression ALIGN, or type whose
11884 alignment is ALIGN) to the declaration specifiers SPECS, returning
11886 struct c_declspecs *
11887 declspecs_add_alignas (location_t loc,
11888 struct c_declspecs *specs, tree align)
11890 specs->alignas_p = true;
11891 specs->locations[cdw_alignas] = loc;
11892 if (align == error_mark_node)
11895 /* Only accept the alignment if it's valid and greater than
11896 the current one. Zero is invalid but by C11 required to
11897 be silently ignored. */
11898 int align_log = check_user_alignment (align, false, /* warn_zero = */false);
11899 if (align_log > specs->align_log)
11900 specs->align_log = align_log;
11904 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
11905 specifiers with any other type specifier to determine the resulting
11906 type. This is where ISO C checks on complex types are made, since
11907 "_Complex long" is a prefix of the valid ISO C type "_Complex long
11908 double". Also apply postfix standard attributes to modify the type. */
11910 struct c_declspecs *
11911 finish_declspecs (struct c_declspecs *specs)
11913 /* If a type was specified as a whole, we have no modifiers and are
11915 if (specs->type != NULL_TREE)
11917 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
11918 && !specs->signed_p && !specs->unsigned_p
11919 && !specs->complex_p);
11921 /* Set a dummy type. */
11922 if (TREE_CODE (specs->type) == ERROR_MARK)
11923 specs->type = integer_type_node;
11924 goto handle_postfix_attrs;
11927 /* If none of "void", "_Bool", "char", "int", "float" or "double"
11928 has been specified, treat it as "int" unless "_Complex" is
11929 present and there are no other specifiers. If we just have
11930 "_Complex", it is equivalent to "_Complex double", but e.g.
11931 "_Complex short" is equivalent to "_Complex short int". */
11932 if (specs->typespec_word == cts_none)
11934 if (specs->saturating_p)
11936 error_at (specs->locations[cdw_saturating],
11937 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
11938 if (!targetm.fixed_point_supported_p ())
11939 error_at (specs->locations[cdw_saturating],
11940 "fixed-point types not supported for this target");
11941 specs->typespec_word = cts_fract;
11943 else if (specs->long_p || specs->short_p
11944 || specs->signed_p || specs->unsigned_p)
11946 specs->typespec_word = cts_int;
11948 else if (specs->complex_p)
11950 specs->typespec_word = cts_double;
11951 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
11952 "ISO C does not support plain %<complex%> meaning "
11953 "%<double complex%>");
11957 specs->typespec_word = cts_int;
11958 specs->default_int_p = true;
11959 /* We don't diagnose this here because grokdeclarator will
11960 give more specific diagnostics according to whether it is
11961 a function definition. */
11965 /* If "signed" was specified, record this to distinguish "int" and
11966 "signed int" in the case of a bit-field with
11967 -funsigned-bitfields. */
11968 specs->explicit_signed_p = specs->signed_p;
11970 /* Now compute the actual type. */
11971 switch (specs->typespec_word)
11973 case cts_auto_type:
11974 gcc_assert (!specs->long_p && !specs->short_p
11975 && !specs->signed_p && !specs->unsigned_p
11976 && !specs->complex_p);
11977 /* Type to be filled in later. */
11978 if (specs->postfix_attrs)
11979 error ("%<__auto_type%> followed by %<[[]]%> attributes");
11982 gcc_assert (!specs->long_p && !specs->short_p
11983 && !specs->signed_p && !specs->unsigned_p
11984 && !specs->complex_p);
11985 specs->type = void_type_node;
11988 gcc_assert (!specs->long_p && !specs->short_p
11989 && !specs->signed_p && !specs->unsigned_p
11990 && !specs->complex_p);
11991 specs->type = boolean_type_node;
11994 gcc_assert (!specs->long_p && !specs->short_p);
11995 gcc_assert (!(specs->signed_p && specs->unsigned_p));
11996 if (specs->signed_p)
11997 specs->type = signed_char_type_node;
11998 else if (specs->unsigned_p)
11999 specs->type = unsigned_char_type_node;
12001 specs->type = char_type_node;
12002 if (specs->complex_p)
12004 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
12005 "ISO C does not support complex integer types");
12006 specs->type = build_complex_type (specs->type);
12010 gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p);
12011 gcc_assert (!(specs->signed_p && specs->unsigned_p));
12012 if (! int_n_enabled_p[specs->int_n_idx])
12013 specs->type = integer_type_node;
12015 specs->type = (specs->unsigned_p
12016 ? int_n_trees[specs->int_n_idx].unsigned_type
12017 : int_n_trees[specs->int_n_idx].signed_type);
12018 if (specs->complex_p)
12020 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
12021 "ISO C does not support complex integer types");
12022 specs->type = build_complex_type (specs->type);
12026 gcc_assert (!(specs->long_p && specs->short_p));
12027 gcc_assert (!(specs->signed_p && specs->unsigned_p));
12028 if (specs->long_long_p)
12029 specs->type = (specs->unsigned_p
12030 ? long_long_unsigned_type_node
12031 : long_long_integer_type_node);
12032 else if (specs->long_p)
12033 specs->type = (specs->unsigned_p
12034 ? long_unsigned_type_node
12035 : long_integer_type_node);
12036 else if (specs->short_p)
12037 specs->type = (specs->unsigned_p
12038 ? short_unsigned_type_node
12039 : short_integer_type_node);
12041 specs->type = (specs->unsigned_p
12042 ? unsigned_type_node
12043 : integer_type_node);
12044 if (specs->complex_p)
12046 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
12047 "ISO C does not support complex integer types");
12048 specs->type = build_complex_type (specs->type);
12052 gcc_assert (!specs->long_p && !specs->short_p
12053 && !specs->signed_p && !specs->unsigned_p);
12054 specs->type = (specs->complex_p
12055 ? complex_float_type_node
12056 : float_type_node);
12059 gcc_assert (!specs->long_long_p && !specs->short_p
12060 && !specs->signed_p && !specs->unsigned_p);
12063 specs->type = (specs->complex_p
12064 ? complex_long_double_type_node
12065 : long_double_type_node);
12069 specs->type = (specs->complex_p
12070 ? complex_double_type_node
12071 : double_type_node);
12074 case cts_floatn_nx:
12075 gcc_assert (!specs->long_p && !specs->short_p
12076 && !specs->signed_p && !specs->unsigned_p);
12077 if (FLOATN_NX_TYPE_NODE (specs->floatn_nx_idx) == NULL_TREE)
12078 specs->type = integer_type_node;
12079 else if (specs->complex_p)
12080 specs->type = COMPLEX_FLOATN_NX_TYPE_NODE (specs->floatn_nx_idx);
12082 specs->type = FLOATN_NX_TYPE_NODE (specs->floatn_nx_idx);
12086 case cts_dfloat128:
12087 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
12088 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
12089 if (!targetm.decimal_float_supported_p ())
12090 specs->type = integer_type_node;
12091 else if (specs->typespec_word == cts_dfloat32)
12092 specs->type = dfloat32_type_node;
12093 else if (specs->typespec_word == cts_dfloat64)
12094 specs->type = dfloat64_type_node;
12096 specs->type = dfloat128_type_node;
12099 gcc_assert (!specs->complex_p);
12100 if (!targetm.fixed_point_supported_p ())
12101 specs->type = integer_type_node;
12102 else if (specs->saturating_p)
12104 if (specs->long_long_p)
12105 specs->type = specs->unsigned_p
12106 ? sat_unsigned_long_long_fract_type_node
12107 : sat_long_long_fract_type_node;
12108 else if (specs->long_p)
12109 specs->type = specs->unsigned_p
12110 ? sat_unsigned_long_fract_type_node
12111 : sat_long_fract_type_node;
12112 else if (specs->short_p)
12113 specs->type = specs->unsigned_p
12114 ? sat_unsigned_short_fract_type_node
12115 : sat_short_fract_type_node;
12117 specs->type = specs->unsigned_p
12118 ? sat_unsigned_fract_type_node
12119 : sat_fract_type_node;
12123 if (specs->long_long_p)
12124 specs->type = specs->unsigned_p
12125 ? unsigned_long_long_fract_type_node
12126 : long_long_fract_type_node;
12127 else if (specs->long_p)
12128 specs->type = specs->unsigned_p
12129 ? unsigned_long_fract_type_node
12130 : long_fract_type_node;
12131 else if (specs->short_p)
12132 specs->type = specs->unsigned_p
12133 ? unsigned_short_fract_type_node
12134 : short_fract_type_node;
12136 specs->type = specs->unsigned_p
12137 ? unsigned_fract_type_node
12142 gcc_assert (!specs->complex_p);
12143 if (!targetm.fixed_point_supported_p ())
12144 specs->type = integer_type_node;
12145 else if (specs->saturating_p)
12147 if (specs->long_long_p)
12148 specs->type = specs->unsigned_p
12149 ? sat_unsigned_long_long_accum_type_node
12150 : sat_long_long_accum_type_node;
12151 else if (specs->long_p)
12152 specs->type = specs->unsigned_p
12153 ? sat_unsigned_long_accum_type_node
12154 : sat_long_accum_type_node;
12155 else if (specs->short_p)
12156 specs->type = specs->unsigned_p
12157 ? sat_unsigned_short_accum_type_node
12158 : sat_short_accum_type_node;
12160 specs->type = specs->unsigned_p
12161 ? sat_unsigned_accum_type_node
12162 : sat_accum_type_node;
12166 if (specs->long_long_p)
12167 specs->type = specs->unsigned_p
12168 ? unsigned_long_long_accum_type_node
12169 : long_long_accum_type_node;
12170 else if (specs->long_p)
12171 specs->type = specs->unsigned_p
12172 ? unsigned_long_accum_type_node
12173 : long_accum_type_node;
12174 else if (specs->short_p)
12175 specs->type = specs->unsigned_p
12176 ? unsigned_short_accum_type_node
12177 : short_accum_type_node;
12179 specs->type = specs->unsigned_p
12180 ? unsigned_accum_type_node
12185 gcc_unreachable ();
12187 handle_postfix_attrs:
12188 if (specs->type != NULL)
12190 specs->postfix_attrs = c_warn_type_attributes (specs->postfix_attrs);
12191 decl_attributes (&specs->type, specs->postfix_attrs, 0);
12192 specs->postfix_attrs = NULL_TREE;
12198 /* Perform final processing on one file scope's declarations (or the
12199 external scope's declarations), GLOBALS. */
12202 c_write_global_declarations_1 (tree globals)
12207 /* Process the decls in the order they were written. */
12208 for (decl = globals; decl; decl = DECL_CHAIN (decl))
12210 /* Check for used but undefined static functions using the C
12211 standard's definition of "used", and set TREE_NO_WARNING so
12212 that check_global_declaration doesn't repeat the check. */
12213 if (TREE_CODE (decl) == FUNCTION_DECL
12214 && DECL_INITIAL (decl) == NULL_TREE
12215 && DECL_EXTERNAL (decl)
12216 && !TREE_PUBLIC (decl))
12218 if (C_DECL_USED (decl))
12220 /* TODO: Add OPT_Wundefined-inline. */
12221 if (pedwarn (input_location, 0, "%q+F used but never defined",
12223 suppress_warning (decl /* OPT_Wundefined-inline. */);
12225 /* For -Wunused-function warn about unused static prototypes. */
12226 else if (warn_unused_function
12227 && ! DECL_ARTIFICIAL (decl)
12228 && ! warning_suppressed_p (decl, OPT_Wunused_function))
12230 if (warning (OPT_Wunused_function,
12231 "%q+F declared %<static%> but never defined",
12233 suppress_warning (decl, OPT_Wunused_function);
12237 wrapup_global_declaration_1 (decl);
12242 reconsider = false;
12243 for (decl = globals; decl; decl = DECL_CHAIN (decl))
12244 reconsider |= wrapup_global_declaration_2 (decl);
12246 while (reconsider);
12249 /* Preserve the external declarations scope across a garbage collect. */
12250 static GTY(()) tree ext_block;
12252 /* Collect all references relevant to SOURCE_FILE. */
12255 collect_all_refs (const char *source_file)
12260 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
12261 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file);
12263 collect_ada_nodes (BLOCK_VARS (ext_block), source_file);
12266 /* Collect source file references at global level. */
12269 collect_source_refs (void)
12276 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
12278 decls = DECL_INITIAL (t);
12279 for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl))
12280 if (!DECL_IS_UNDECLARED_BUILTIN (decl))
12281 collect_source_ref (DECL_SOURCE_FILE (decl));
12284 for (decl = BLOCK_VARS (ext_block); decl; decl = TREE_CHAIN (decl))
12285 if (!DECL_IS_UNDECLARED_BUILTIN (decl))
12286 collect_source_ref (DECL_SOURCE_FILE (decl));
12289 /* Free attribute access data that are not needed by the middle end. */
12292 free_attr_access_data ()
12294 struct cgraph_node *n;
12296 /* Iterate over all functions declared in the translation unit. */
12297 FOR_EACH_FUNCTION (n)
12299 for (tree parm = DECL_ARGUMENTS (n->decl); parm; parm = TREE_CHAIN (parm))
12300 if (tree attrs = DECL_ATTRIBUTES (parm))
12301 attr_access::free_lang_data (attrs);
12303 tree fntype = TREE_TYPE (n->decl);
12304 if (!fntype || fntype == error_mark_node)
12306 tree attrs = TYPE_ATTRIBUTES (fntype);
12310 attr_access::free_lang_data (attrs);
12314 /* Perform any final parser cleanups and generate initial debugging
12318 c_parse_final_cleanups (void)
12323 /* We don't want to do this if generating a PCH. */
12327 timevar_stop (TV_PHASE_PARSING);
12328 timevar_start (TV_PHASE_DEFERRED);
12330 /* Do the Objective-C stuff. This is where all the Objective-C
12331 module stuff gets generated (symtab, class/protocol/selector
12333 if (c_dialect_objc ())
12334 objc_write_global_declarations ();
12336 /* Close the external scope. */
12337 ext_block = pop_scope ();
12338 external_scope = 0;
12339 gcc_assert (!current_scope);
12341 /* Handle -fdump-ada-spec[-slim]. */
12342 if (flag_dump_ada_spec || flag_dump_ada_spec_slim)
12344 /* Build a table of files to generate specs for */
12345 collect_source_ref (main_input_filename);
12346 if (!flag_dump_ada_spec_slim)
12347 collect_source_refs ();
12349 dump_ada_specs (collect_all_refs, NULL);
12352 /* Process all file scopes in this compilation, and the external_scope,
12353 through wrapup_global_declarations. */
12354 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
12355 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
12356 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
12359 free_attr_access_data ();
12361 timevar_stop (TV_PHASE_DEFERRED);
12362 timevar_start (TV_PHASE_PARSING);
12367 /* Register reserved keyword WORD as qualifier for address space AS. */
12370 c_register_addr_space (const char *word, addr_space_t as)
12372 int rid = RID_FIRST_ADDR_SPACE + as;
12375 /* Address space qualifiers are only supported
12376 in C with GNU extensions enabled. */
12377 if (c_dialect_objc () || flag_no_asm)
12380 id = get_identifier (word);
12381 C_SET_RID_CODE (id, rid);
12382 C_IS_RESERVED_WORD (id) = 1;
12383 ridpointers [rid] = id;
12386 /* Return identifier to look up for omp declare reduction. */
12389 c_omp_reduction_id (enum tree_code reduction_code, tree reduction_id)
12391 const char *p = NULL;
12392 switch (reduction_code)
12394 case PLUS_EXPR: p = "+"; break;
12395 case MULT_EXPR: p = "*"; break;
12396 case MINUS_EXPR: p = "-"; break;
12397 case BIT_AND_EXPR: p = "&"; break;
12398 case BIT_XOR_EXPR: p = "^"; break;
12399 case BIT_IOR_EXPR: p = "|"; break;
12400 case TRUTH_ANDIF_EXPR: p = "&&"; break;
12401 case TRUTH_ORIF_EXPR: p = "||"; break;
12402 case MIN_EXPR: p = "min"; break;
12403 case MAX_EXPR: p = "max"; break;
12410 if (TREE_CODE (reduction_id) != IDENTIFIER_NODE)
12411 return error_mark_node;
12412 p = IDENTIFIER_POINTER (reduction_id);
12415 const char prefix[] = "omp declare reduction ";
12416 size_t lenp = sizeof (prefix);
12417 size_t len = strlen (p);
12418 char *name = XALLOCAVEC (char, lenp + len);
12419 memcpy (name, prefix, lenp - 1);
12420 memcpy (name + lenp - 1, p, len + 1);
12421 return get_identifier (name);
12424 /* Lookup REDUCTION_ID in the current scope, or create an artificial
12425 VAR_DECL, bind it into the current scope and return it. */
12428 c_omp_reduction_decl (tree reduction_id)
12430 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
12431 if (b != NULL && B_IN_CURRENT_SCOPE (b))
12434 tree decl = build_decl (BUILTINS_LOCATION, VAR_DECL,
12435 reduction_id, integer_type_node);
12436 DECL_ARTIFICIAL (decl) = 1;
12437 DECL_EXTERNAL (decl) = 1;
12438 TREE_STATIC (decl) = 1;
12439 TREE_PUBLIC (decl) = 0;
12440 bind (reduction_id, decl, current_scope, true, false, BUILTINS_LOCATION);
12444 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
12447 c_omp_reduction_lookup (tree reduction_id, tree type)
12449 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
12453 for (t = DECL_INITIAL (b->decl); t; t = TREE_CHAIN (t))
12454 if (comptypes (TREE_PURPOSE (t), type))
12455 return TREE_VALUE (t);
12458 return error_mark_node;
12461 /* Helper function called via walk_tree, to diagnose invalid
12462 #pragma omp declare reduction combiners or initializers. */
12465 c_check_omp_declare_reduction_r (tree *tp, int *, void *data)
12467 tree *vars = (tree *) data;
12468 if (SSA_VAR_P (*tp)
12469 && !DECL_ARTIFICIAL (*tp)
12473 location_t loc = DECL_SOURCE_LOCATION (vars[0]);
12474 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars[0])), "omp_out") == 0)
12475 error_at (loc, "%<#pragma omp declare reduction%> combiner refers to "
12476 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
12479 error_at (loc, "%<#pragma omp declare reduction%> initializer refers "
12480 "to variable %qD which is not %<omp_priv%> nor "
12490 c_check_in_current_scope (tree decl)
12492 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (decl));
12493 return b != NULL && B_IN_CURRENT_SCOPE (b);
12496 #include "gt-c-c-decl.h"