1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Process declarations and symbol lookup for C front end.
21 Also constructs types; the standard scalar types at initialization,
22 and structure, union, array and enum types when they are declared. */
24 /* ??? not all decl nodes are given the most useful possible
25 line numbers. For example, the CONST_DECLs for enum values. */
29 #include "coretypes.h"
35 #include "fold-const.h"
36 #include "print-tree.h"
37 #include "stor-layout.h"
40 #include "stringpool.h"
41 #include "tree-inline.h"
43 #include "hard-reg-set.h"
53 #include "c-family/c-common.h"
54 #include "c-family/c-objc.h"
55 #include "c-family/c-pragma.h"
56 #include "c-family/c-ubsan.h"
58 #include "langhooks.h"
59 #include "tree-iterator.h"
60 #include "diagnostic-core.h"
62 #include "plugin-api.h"
65 #include "langhooks-def.h"
67 #include "c-family/c-ada-spec.h"
71 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
73 { NORMAL, /* Ordinary declaration */
74 FUNCDEF, /* Function definition */
75 PARM, /* Declaration of parm before function body */
76 FIELD, /* Declaration inside struct or union */
77 TYPENAME}; /* Typename (inside cast or sizeof) */
79 /* States indicating how grokdeclarator() should handle declspecs marked
80 with __attribute__((deprecated)). An object declared as
81 __attribute__((deprecated)) suppresses warnings of uses of other
84 enum deprecated_states {
90 /* Nonzero if we have seen an invalid cross reference
91 to a struct, union, or enum, but not yet printed the message. */
92 tree pending_invalid_xref;
94 /* File and line to appear in the eventual error message. */
95 location_t pending_invalid_xref_location;
97 /* The file and line that the prototype came from if this is an
98 old-style definition; used for diagnostics in
99 store_parm_decls_oldstyle. */
101 static location_t current_function_prototype_locus;
103 /* Whether this prototype was built-in. */
105 static bool current_function_prototype_built_in;
107 /* The argument type information of this prototype. */
109 static tree current_function_prototype_arg_types;
111 /* The argument information structure for the function currently being
114 static struct c_arg_info *current_function_arg_info;
116 /* The obstack on which parser and related data structures, which are
117 not live beyond their top-level declaration or definition, are
119 struct obstack parser_obstack;
121 /* The current statement tree. */
123 static GTY(()) struct stmt_tree_s c_stmt_tree;
125 /* State saving variables. */
129 /* A list of decls to be made automatically visible in each file scope. */
130 static GTY(()) tree visible_builtins;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement that specifies a return value is seen. */
135 int current_function_returns_value;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a return statement with no argument is seen. */
140 int current_function_returns_null;
142 /* Set to 0 at beginning of a function definition, set to 1 if
143 a call to a noreturn function is seen. */
145 int current_function_returns_abnormally;
147 /* Set to nonzero by `grokdeclarator' for a function
148 whose return type is defaulted, if warnings for this are desired. */
150 static int warn_about_return_type;
152 /* Nonzero when the current toplevel function contains a declaration
153 of a nested function which is never defined. */
155 static bool undef_nested_function;
157 /* If non-zero, implicit "omp declare target" attribute is added into the
159 int current_omp_declare_target_attribute;
161 /* Each c_binding structure describes one binding of an identifier to
162 a decl. All the decls in a scope - irrespective of namespace - are
163 chained together by the ->prev field, which (as the name implies)
164 runs in reverse order. All the decls in a given namespace bound to
165 a given identifier are chained by the ->shadowed field, which runs
166 from inner to outer scopes.
168 The ->decl field usually points to a DECL node, but there are two
169 exceptions. In the namespace of type tags, the bound entity is a
170 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
171 identifier is encountered, it is bound to error_mark_node to
172 suppress further errors about that identifier in the current
175 The ->u.type field stores the type of the declaration in this scope;
176 if NULL, the type is the type of the ->decl field. This is only of
177 relevance for objects with external or internal linkage which may
178 be redeclared in inner scopes, forming composite types that only
179 persist for the duration of those scopes. In the external scope,
180 this stores the composite of all the types declared for this
181 object, visible or not. The ->inner_comp field (used only at file
182 scope) stores whether an incomplete array type at file scope was
183 completed at an inner scope to an array size other than 1.
185 The ->u.label field is used for labels. It points to a structure
186 which stores additional information used for warnings.
188 The depth field is copied from the scope structure that holds this
189 decl. It is used to preserve the proper ordering of the ->shadowed
190 field (see bind()) and also for a handful of special-case checks.
191 Finally, the invisible bit is true for a decl which should be
192 ignored for purposes of normal name lookup, and the nested bit is
193 true for a decl that's been bound a second time in an inner scope;
194 in all such cases, the binding in the outer scope will have its
195 invisible bit true. */
197 struct GTY((chain_next ("%h.prev"))) c_binding {
198 union GTY(()) { /* first so GTY desc can use decl */
199 tree GTY((tag ("0"))) type; /* the type in this scope */
200 struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */
201 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u;
202 tree decl; /* the decl bound */
203 tree id; /* the identifier it's bound to */
204 struct c_binding *prev; /* the previous decl in this scope */
205 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
206 unsigned int depth : 28; /* depth of this scope */
207 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
208 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
209 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
210 BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */
211 location_t locus; /* location for nested bindings */
213 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
214 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
215 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
216 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
218 /* Each C symbol points to three linked lists of c_binding structures.
219 These describe the values of the identifier in the three different
220 namespaces defined by the language. */
222 struct GTY(()) lang_identifier {
223 struct c_common_identifier common_id;
224 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
225 struct c_binding *tag_binding; /* struct/union/enum tags */
226 struct c_binding *label_binding; /* labels */
229 /* Validate c-lang.c's assumptions. */
230 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
231 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
233 /* The binding oracle; see c-tree.h. */
234 void (*c_binding_oracle) (enum c_oracle_request, tree identifier);
236 /* This flag is set on an identifier if we have previously asked the
237 binding oracle for this identifier's symbol binding. */
238 #define I_SYMBOL_CHECKED(node) \
239 (TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (node)))
241 static inline struct c_binding* *
242 i_symbol_binding (tree node)
244 struct lang_identifier *lid
245 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
247 if (lid->symbol_binding == NULL
248 && c_binding_oracle != NULL
249 && !I_SYMBOL_CHECKED (node))
251 /* Set the "checked" flag first, to avoid infinite recursion
252 when the binding oracle calls back into gcc. */
253 I_SYMBOL_CHECKED (node) = 1;
254 c_binding_oracle (C_ORACLE_SYMBOL, node);
257 return &lid->symbol_binding;
260 #define I_SYMBOL_BINDING(node) (*i_symbol_binding (node))
262 #define I_SYMBOL_DECL(node) \
263 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
265 /* This flag is set on an identifier if we have previously asked the
266 binding oracle for this identifier's tag binding. */
267 #define I_TAG_CHECKED(node) \
268 (TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (node)))
270 static inline struct c_binding **
271 i_tag_binding (tree node)
273 struct lang_identifier *lid
274 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
276 if (lid->tag_binding == NULL
277 && c_binding_oracle != NULL
278 && !I_TAG_CHECKED (node))
280 /* Set the "checked" flag first, to avoid infinite recursion
281 when the binding oracle calls back into gcc. */
282 I_TAG_CHECKED (node) = 1;
283 c_binding_oracle (C_ORACLE_TAG, node);
286 return &lid->tag_binding;
289 #define I_TAG_BINDING(node) (*i_tag_binding (node))
291 #define I_TAG_DECL(node) \
292 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
294 /* This flag is set on an identifier if we have previously asked the
295 binding oracle for this identifier's label binding. */
296 #define I_LABEL_CHECKED(node) \
297 (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (node)))
299 static inline struct c_binding **
300 i_label_binding (tree node)
302 struct lang_identifier *lid
303 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
305 if (lid->label_binding == NULL
306 && c_binding_oracle != NULL
307 && !I_LABEL_CHECKED (node))
309 /* Set the "checked" flag first, to avoid infinite recursion
310 when the binding oracle calls back into gcc. */
311 I_LABEL_CHECKED (node) = 1;
312 c_binding_oracle (C_ORACLE_LABEL, node);
315 return &lid->label_binding;
318 #define I_LABEL_BINDING(node) (*i_label_binding (node))
320 #define I_LABEL_DECL(node) \
321 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
323 /* The resulting tree type. */
325 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
326 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
328 union tree_node GTY ((tag ("0"),
329 desc ("tree_node_structure (&%h)")))
331 struct lang_identifier GTY ((tag ("1"))) identifier;
334 /* Track bindings and other things that matter for goto warnings. For
335 efficiency, we do not gather all the decls at the point of
336 definition. Instead, we point into the bindings structure. As
337 scopes are popped, we update these structures and gather the decls
338 that matter at that time. */
340 struct GTY(()) c_spot_bindings {
341 /* The currently open scope which holds bindings defined when the
342 label was defined or the goto statement was found. */
343 struct c_scope *scope;
344 /* The bindings in the scope field which were defined at the point
345 of the label or goto. This lets us look at older or newer
346 bindings in the scope, as appropriate. */
347 struct c_binding *bindings_in_scope;
348 /* The number of statement expressions that have started since this
349 label or goto statement was defined. This is zero if we are at
350 the same statement expression level. It is positive if we are in
351 a statement expression started since this spot. It is negative
352 if this spot was in a statement expression and we have left
355 /* Whether we started in a statement expression but are no longer in
356 it. This is set to true if stmt_exprs ever goes negative. */
360 /* This structure is used to keep track of bindings seen when a goto
361 statement is defined. This is only used if we see the goto
362 statement before we see the label. */
364 struct GTY(()) c_goto_bindings {
365 /* The location of the goto statement. */
367 /* The bindings of the goto statement. */
368 struct c_spot_bindings goto_bindings;
371 typedef struct c_goto_bindings *c_goto_bindings_p;
373 /* The additional information we keep track of for a label binding.
374 These fields are updated as scopes are popped. */
376 struct GTY(()) c_label_vars {
377 /* The shadowed c_label_vars, when one label shadows another (which
378 can only happen using a __label__ declaration). */
379 struct c_label_vars *shadowed;
380 /* The bindings when the label was defined. */
381 struct c_spot_bindings label_bindings;
382 /* A list of decls that we care about: decls about which we should
383 warn if a goto branches to this label from later in the function.
384 Decls are added to this list as scopes are popped. We only add
385 the decls that matter. */
386 vec<tree, va_gc> *decls_in_scope;
387 /* A list of goto statements to this label. This is only used for
388 goto statements seen before the label was defined, so that we can
389 issue appropriate warnings for them. */
390 vec<c_goto_bindings_p, va_gc> *gotos;
393 /* Each c_scope structure describes the complete contents of one
394 scope. Four scopes are distinguished specially: the innermost or
395 current scope, the innermost function scope, the file scope (always
396 the second to outermost) and the outermost or external scope.
398 Most declarations are recorded in the current scope.
400 All normal label declarations are recorded in the innermost
401 function scope, as are bindings of undeclared identifiers to
402 error_mark_node. (GCC permits nested functions as an extension,
403 hence the 'innermost' qualifier.) Explicitly declared labels
404 (using the __label__ extension) appear in the current scope.
406 Being in the file scope (current_scope == file_scope) causes
407 special behavior in several places below. Also, under some
408 conditions the Objective-C front end records declarations in the
409 file scope even though that isn't the current scope.
411 All declarations with external linkage are recorded in the external
412 scope, even if they aren't visible there; this models the fact that
413 such declarations are visible to the entire program, and (with a
414 bit of cleverness, see pushdecl) allows diagnosis of some violations
415 of C99 6.2.2p7 and 6.2.7p2:
417 If, within the same translation unit, the same identifier appears
418 with both internal and external linkage, the behavior is
421 All declarations that refer to the same object or function shall
422 have compatible type; otherwise, the behavior is undefined.
424 Initially only the built-in declarations, which describe compiler
425 intrinsic functions plus a subset of the standard library, are in
428 The order of the blocks list matters, and it is frequently appended
429 to. To avoid having to walk all the way to the end of the list on
430 each insertion, or reverse the list later, we maintain a pointer to
431 the last list entry. (FIXME: It should be feasible to use a reversed
434 The bindings list is strictly in reverse order of declarations;
435 pop_scope relies on this. */
438 struct GTY((chain_next ("%h.outer"))) c_scope {
439 /* The scope containing this one. */
440 struct c_scope *outer;
442 /* The next outermost function scope. */
443 struct c_scope *outer_function;
445 /* All bindings in this scope. */
446 struct c_binding *bindings;
448 /* For each scope (except the global one), a chain of BLOCK nodes
449 for all the scopes that were entered and exited one level down. */
453 /* The depth of this scope. Used to keep the ->shadowed chain of
454 bindings sorted innermost to outermost. */
455 unsigned int depth : 28;
457 /* True if we are currently filling this scope with parameter
459 BOOL_BITFIELD parm_flag : 1;
461 /* True if we saw [*] in this scope. Used to give an error messages
462 if these appears in a function definition. */
463 BOOL_BITFIELD had_vla_unspec : 1;
465 /* True if we already complained about forward parameter decls
466 in this scope. This prevents double warnings on
467 foo (int a; int b; ...) */
468 BOOL_BITFIELD warned_forward_parm_decls : 1;
470 /* True if this is the outermost block scope of a function body.
471 This scope contains the parameters, the local variables declared
472 in the outermost block, and all the labels (except those in
473 nested functions, or declared at block scope with __label__). */
474 BOOL_BITFIELD function_body : 1;
476 /* True means make a BLOCK for this scope no matter what. */
477 BOOL_BITFIELD keep : 1;
479 /* True means that an unsuffixed float constant is _Decimal64. */
480 BOOL_BITFIELD float_const_decimal64 : 1;
482 /* True if this scope has any label bindings. This is used to speed
483 up searching for labels when popping scopes, particularly since
484 labels are normally only found at function scope. */
485 BOOL_BITFIELD has_label_bindings : 1;
487 /* True if we should issue a warning if a goto statement crosses any
488 of the bindings. We still need to check the list of bindings to
489 find the specific ones we need to warn about. This is true if
490 decl_jump_unsafe would return true for any of the bindings. This
491 is used to avoid looping over all the bindings unnecessarily. */
492 BOOL_BITFIELD has_jump_unsafe_decl : 1;
495 /* The scope currently in effect. */
497 static GTY(()) struct c_scope *current_scope;
499 /* The innermost function scope. Ordinary (not explicitly declared)
500 labels, bindings to error_mark_node, and the lazily-created
501 bindings of __func__ and its friends get this scope. */
503 static GTY(()) struct c_scope *current_function_scope;
505 /* The C file scope. This is reset for each input translation unit. */
507 static GTY(()) struct c_scope *file_scope;
509 /* The outermost scope. This is used for all declarations with
510 external linkage, and only these, hence the name. */
512 static GTY(()) struct c_scope *external_scope;
514 /* A chain of c_scope structures awaiting reuse. */
516 static GTY((deletable)) struct c_scope *scope_freelist;
518 /* A chain of c_binding structures awaiting reuse. */
520 static GTY((deletable)) struct c_binding *binding_freelist;
522 /* Append VAR to LIST in scope SCOPE. */
523 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
524 struct c_scope *s_ = (scope); \
526 if (s_->list##_last) \
527 BLOCK_CHAIN (s_->list##_last) = d_; \
530 s_->list##_last = d_; \
533 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
534 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
535 struct c_scope *t_ = (tscope); \
536 struct c_scope *f_ = (fscope); \
538 BLOCK_CHAIN (t_->to##_last) = f_->from; \
541 t_->to##_last = f_->from##_last; \
544 /* A c_inline_static structure stores details of a static identifier
545 referenced in a definition of a function that may be an inline
546 definition if no subsequent declaration of that function uses
547 "extern" or does not use "inline". */
549 struct GTY((chain_next ("%h.next"))) c_inline_static {
550 /* The location for a diagnostic. */
553 /* The function that may be an inline definition. */
556 /* The object or function referenced. */
559 /* What sort of reference this is. */
560 enum c_inline_static_type type;
562 /* The next such structure or NULL. */
563 struct c_inline_static *next;
566 /* List of static identifiers used or referenced in functions that may
567 be inline definitions. */
568 static GTY(()) struct c_inline_static *c_inline_statics;
570 /* True means unconditionally make a BLOCK for the next scope pushed. */
572 static bool keep_next_level_flag;
574 /* True means the next call to push_scope will be the outermost scope
575 of a function body, so do not push a new scope, merely cease
576 expecting parameter decls. */
578 static bool next_is_function_body;
580 /* A vector of pointers to c_binding structures. */
582 typedef struct c_binding *c_binding_ptr;
584 /* Information that we keep for a struct or union while it is being
587 struct c_struct_parse_info
589 /* If warn_cxx_compat, a list of types defined within this
591 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 vec<c_binding_ptr> fields;
597 /* If warn_cxx_compat, a list of typedef names used when defining
598 fields in this struct. */
599 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 struct 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);
618 /* T is a statement. Add it to the statement-tree. This is the
619 C/ObjC version--C++ has a slightly different version of this
625 enum tree_code code = TREE_CODE (t);
627 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
629 if (!EXPR_HAS_LOCATION (t))
630 SET_EXPR_LOCATION (t, input_location);
633 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
634 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
636 /* Add T to the statement-tree. Non-side-effect statements need to be
637 recorded during statement expressions. */
638 if (!building_stmt_list_p ())
640 append_to_statement_list_force (t, &cur_stmt_list);
645 /* Build a pointer type using the default pointer mode. */
648 c_build_pointer_type (tree to_type)
650 addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC
651 : TYPE_ADDR_SPACE (to_type);
652 machine_mode pointer_mode;
654 if (as != ADDR_SPACE_GENERIC || c_default_pointer_mode == VOIDmode)
655 pointer_mode = targetm.addr_space.pointer_mode (as);
657 pointer_mode = c_default_pointer_mode;
658 return build_pointer_type_for_mode (to_type, pointer_mode, false);
662 /* Return true if we will want to say something if a goto statement
666 decl_jump_unsafe (tree decl)
668 if (error_operand_p (decl))
671 /* Always warn about crossing variably modified types. */
672 if ((VAR_P (decl) || TREE_CODE (decl) == TYPE_DECL)
673 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
676 /* Otherwise, only warn if -Wgoto-misses-init and this is an
677 initialized automatic decl. */
678 if (warn_jump_misses_init
680 && !TREE_STATIC (decl)
681 && DECL_INITIAL (decl) != NULL_TREE)
689 c_print_identifier (FILE *file, tree node, int indent)
691 void (*save) (enum c_oracle_request, tree identifier);
693 /* Temporarily hide any binding oracle. Without this, calls to
694 debug_tree from the debugger will end up calling into the oracle,
695 making for a confusing debug session. As the oracle isn't needed
696 here for normal operation, it's simplest to suppress it. */
697 save = c_binding_oracle;
698 c_binding_oracle = NULL;
700 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
701 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
702 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
703 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
705 tree rid = ridpointers[C_RID_CODE (node)];
706 indent_to (file, indent + 4);
707 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
708 (void *) rid, IDENTIFIER_POINTER (rid));
711 c_binding_oracle = save;
714 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
715 which may be any of several kinds of DECL or TYPE or error_mark_node,
716 in the scope SCOPE. */
718 bind (tree name, tree decl, struct c_scope *scope, bool invisible,
719 bool nested, location_t locus)
721 struct c_binding *b, **here;
723 if (binding_freelist)
725 b = binding_freelist;
726 binding_freelist = b->prev;
729 b = ggc_alloc<c_binding> ();
734 b->depth = scope->depth;
735 b->invisible = invisible;
743 b->prev = scope->bindings;
746 if (decl_jump_unsafe (decl))
747 scope->has_jump_unsafe_decl = 1;
752 switch (TREE_CODE (decl))
754 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
757 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
763 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
769 /* Locate the appropriate place in the chain of shadowed decls
770 to insert this binding. Normally, scope == current_scope and
771 this does nothing. */
772 while (*here && (*here)->depth > scope->depth)
773 here = &(*here)->shadowed;
779 /* Clear the binding structure B, stick it on the binding_freelist,
780 and return the former value of b->prev. This is used by pop_scope
781 and get_parm_info to iterate destructively over all the bindings
782 from a given scope. */
783 static struct c_binding *
784 free_binding_and_advance (struct c_binding *b)
786 struct c_binding *prev = b->prev;
788 memset (b, 0, sizeof (struct c_binding));
789 b->prev = binding_freelist;
790 binding_freelist = b;
795 /* Bind a label. Like bind, but skip fields which aren't used for
796 labels, and add the LABEL_VARS value. */
798 bind_label (tree name, tree label, struct c_scope *scope,
799 struct c_label_vars *label_vars)
803 bind (name, label, scope, /*invisible=*/false, /*nested=*/false,
806 scope->has_label_bindings = true;
809 gcc_assert (b->decl == label);
810 label_vars->shadowed = b->u.label;
811 b->u.label = label_vars;
814 /* Hook called at end of compilation to assume 1 elt
815 for a file-scope tentative array defn that wasn't complete before. */
818 c_finish_incomplete_decl (tree decl)
822 tree type = TREE_TYPE (decl);
823 if (type != error_mark_node
824 && TREE_CODE (type) == ARRAY_TYPE
825 && !DECL_EXTERNAL (decl)
826 && TYPE_DOMAIN (type) == 0)
828 warning_at (DECL_SOURCE_LOCATION (decl),
829 0, "array %q+D assumed to have one element", decl);
831 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
833 relayout_decl (decl);
838 /* Record that inline function FUNC contains a reference (location
839 LOC) to static DECL (file-scope or function-local according to
843 record_inline_static (location_t loc, tree func, tree decl,
844 enum c_inline_static_type type)
846 c_inline_static *csi = ggc_alloc<c_inline_static> ();
848 csi->function = func;
849 csi->static_decl = decl;
851 csi->next = c_inline_statics;
852 c_inline_statics = csi;
855 /* Check for references to static declarations in inline functions at
856 the end of the translation unit and diagnose them if the functions
857 are still inline definitions. */
860 check_inline_statics (void)
862 struct c_inline_static *csi;
863 for (csi = c_inline_statics; csi; csi = csi->next)
865 if (DECL_EXTERNAL (csi->function))
869 pedwarn (csi->location, 0,
870 "%qD is static but used in inline function %qD "
871 "which is not static", csi->static_decl, csi->function);
874 pedwarn (csi->location, 0,
875 "%q+D is static but declared in inline function %qD "
876 "which is not static", csi->static_decl, csi->function);
882 c_inline_statics = NULL;
885 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
886 for the current state, otherwise set it to uninitialized. */
889 set_spot_bindings (struct c_spot_bindings *p, bool defining)
893 p->scope = current_scope;
894 p->bindings_in_scope = current_scope->bindings;
899 p->bindings_in_scope = NULL;
902 p->left_stmt_expr = false;
905 /* Update spot bindings P as we pop out of SCOPE. Return true if we
906 should push decls for a label. */
909 update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p)
911 if (p->scope != scope)
913 /* This label or goto is defined in some other scope, or it is a
914 label which is not yet defined. There is nothing to
919 /* Adjust the spot bindings to refer to the bindings already defined
920 in the enclosing scope. */
921 p->scope = scope->outer;
922 p->bindings_in_scope = p->scope->bindings;
927 /* The Objective-C front-end often needs to determine the current scope. */
930 objc_get_current_scope (void)
932 return current_scope;
935 /* The following function is used only by Objective-C. It needs to live here
936 because it accesses the innards of c_scope. */
939 objc_mark_locals_volatile (void *enclosing_blk)
941 struct c_scope *scope;
944 for (scope = current_scope;
945 scope && scope != enclosing_blk;
946 scope = scope->outer)
948 for (b = scope->bindings; b; b = b->prev)
949 objc_volatilize_decl (b->decl);
951 /* Do not climb up past the current function. */
952 if (scope->function_body)
957 /* Return true if we are in the global binding level. */
960 global_bindings_p (void)
962 return current_scope == file_scope;
966 keep_next_level (void)
968 keep_next_level_flag = true;
971 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
974 set_float_const_decimal64 (void)
976 current_scope->float_const_decimal64 = true;
979 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
982 clear_float_const_decimal64 (void)
984 current_scope->float_const_decimal64 = false;
987 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
990 float_const_decimal64_p (void)
992 return current_scope->float_const_decimal64;
995 /* Identify this scope as currently being filled with parameters. */
998 declare_parm_level (void)
1000 current_scope->parm_flag = true;
1006 if (next_is_function_body)
1008 /* This is the transition from the parameters to the top level
1009 of the function body. These are the same scope
1010 (C99 6.2.1p4,6) so we do not push another scope structure.
1011 next_is_function_body is set only by store_parm_decls, which
1012 in turn is called when and only when we are about to
1013 encounter the opening curly brace for the function body.
1015 The outermost block of a function always gets a BLOCK node,
1016 because the debugging output routines expect that each
1017 function has at least one BLOCK. */
1018 current_scope->parm_flag = false;
1019 current_scope->function_body = true;
1020 current_scope->keep = true;
1021 current_scope->outer_function = current_function_scope;
1022 current_function_scope = current_scope;
1024 keep_next_level_flag = false;
1025 next_is_function_body = false;
1027 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1028 if (current_scope->outer)
1029 current_scope->float_const_decimal64
1030 = current_scope->outer->float_const_decimal64;
1032 current_scope->float_const_decimal64 = false;
1036 struct c_scope *scope;
1039 scope = scope_freelist;
1040 scope_freelist = scope->outer;
1043 scope = ggc_cleared_alloc<c_scope> ();
1045 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1047 scope->float_const_decimal64 = current_scope->float_const_decimal64;
1049 scope->float_const_decimal64 = false;
1051 scope->keep = keep_next_level_flag;
1052 scope->outer = current_scope;
1053 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
1055 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
1057 if (current_scope && scope->depth == 0)
1060 sorry ("GCC supports only %u nested scopes", scope->depth);
1063 current_scope = scope;
1064 keep_next_level_flag = false;
1068 /* This is called when we are leaving SCOPE. For each label defined
1069 in SCOPE, add any appropriate decls to its decls_in_scope fields.
1070 These are the decls whose initialization will be skipped by a goto
1071 later in the function. */
1074 update_label_decls (struct c_scope *scope)
1081 if (s->has_label_bindings)
1083 struct c_binding *b;
1085 for (b = s->bindings; b != NULL; b = b->prev)
1087 struct c_label_vars *label_vars;
1088 struct c_binding *b1;
1091 struct c_goto_bindings *g;
1093 if (TREE_CODE (b->decl) != LABEL_DECL)
1095 label_vars = b->u.label;
1097 b1 = label_vars->label_bindings.bindings_in_scope;
1098 if (label_vars->label_bindings.scope == NULL)
1101 hjud = label_vars->label_bindings.scope->has_jump_unsafe_decl;
1102 if (update_spot_bindings (scope, &label_vars->label_bindings))
1104 /* This label is defined in this scope. */
1107 for (; b1 != NULL; b1 = b1->prev)
1109 /* A goto from later in the function to this
1110 label will never see the initialization
1111 of B1, if any. Save it to issue a
1112 warning if needed. */
1113 if (decl_jump_unsafe (b1->decl))
1114 vec_safe_push(label_vars->decls_in_scope, b1->decl);
1119 /* Update the bindings of any goto statements associated
1121 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1122 update_spot_bindings (scope, &g->goto_bindings);
1126 /* Don't search beyond the current function. */
1127 if (s == current_function_scope)
1134 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1137 set_type_context (tree type, tree context)
1139 for (type = TYPE_MAIN_VARIANT (type); type;
1140 type = TYPE_NEXT_VARIANT (type))
1141 TYPE_CONTEXT (type) = context;
1144 /* Exit a scope. Restore the state of the identifier-decl mappings
1145 that were in effect when this scope was entered. Return a BLOCK
1146 node containing all the DECLs in this scope that are of interest
1147 to debug info generation. */
1152 struct c_scope *scope = current_scope;
1153 tree block, context, p;
1154 struct c_binding *b;
1156 bool functionbody = scope->function_body;
1157 bool keep = functionbody || scope->keep || scope->bindings;
1159 update_label_decls (scope);
1161 /* If appropriate, create a BLOCK to record the decls for the life
1162 of this function. */
1166 block = make_node (BLOCK);
1167 BLOCK_SUBBLOCKS (block) = scope->blocks;
1168 TREE_USED (block) = 1;
1170 /* In each subblock, record that this is its superior. */
1171 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
1172 BLOCK_SUPERCONTEXT (p) = block;
1174 BLOCK_VARS (block) = 0;
1177 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1178 scope must be set so that they point to the appropriate
1179 construct, i.e. either to the current FUNCTION_DECL node, or
1180 else to the BLOCK node we just constructed.
1182 Note that for tagged types whose scope is just the formal
1183 parameter list for some function type specification, we can't
1184 properly set their TYPE_CONTEXTs here, because we don't have a
1185 pointer to the appropriate FUNCTION_TYPE node readily available
1186 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1187 type nodes get set in `grokdeclarator' as soon as we have created
1188 the FUNCTION_TYPE node which will represent the "scope" for these
1189 "parameter list local" tagged types. */
1190 if (scope->function_body)
1191 context = current_function_decl;
1192 else if (scope == file_scope)
1194 tree file_decl = build_translation_unit_decl (NULL_TREE);
1195 context = file_decl;
1196 debug_hooks->register_main_translation_unit (file_decl);
1201 /* Clear all bindings in this scope. */
1202 for (b = scope->bindings; b; b = free_binding_and_advance (b))
1205 switch (TREE_CODE (p))
1208 /* Warnings for unused labels, errors for undefined labels. */
1209 if (TREE_USED (p) && !DECL_INITIAL (p))
1211 error ("label %q+D used but not defined", p);
1212 DECL_INITIAL (p) = error_mark_node;
1215 warn_for_unused_label (p);
1217 /* Labels go in BLOCK_VARS. */
1218 DECL_CHAIN (p) = BLOCK_VARS (block);
1219 BLOCK_VARS (block) = p;
1220 gcc_assert (I_LABEL_BINDING (b->id) == b);
1221 I_LABEL_BINDING (b->id) = b->shadowed;
1223 /* Also pop back to the shadowed label_vars. */
1224 release_tree_vector (b->u.label->decls_in_scope);
1225 b->u.label = b->u.label->shadowed;
1231 set_type_context (p, context);
1233 /* Types may not have tag-names, in which case the type
1234 appears in the bindings list with b->id NULL. */
1237 gcc_assert (I_TAG_BINDING (b->id) == b);
1238 I_TAG_BINDING (b->id) = b->shadowed;
1243 /* Propagate TREE_ADDRESSABLE from nested functions to their
1244 containing functions. */
1245 if (!TREE_ASM_WRITTEN (p)
1246 && DECL_INITIAL (p) != 0
1247 && TREE_ADDRESSABLE (p)
1248 && DECL_ABSTRACT_ORIGIN (p) != 0
1249 && DECL_ABSTRACT_ORIGIN (p) != p)
1250 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
1251 if (!DECL_EXTERNAL (p)
1252 && !DECL_INITIAL (p)
1253 && scope != file_scope
1254 && scope != external_scope)
1256 error ("nested function %q+D declared but never defined", p);
1257 undef_nested_function = true;
1259 else if (DECL_DECLARED_INLINE_P (p)
1261 && !DECL_INITIAL (p))
1263 /* C99 6.7.4p6: "a function with external linkage... declared
1264 with an inline function specifier ... shall also be defined
1265 in the same translation unit." */
1266 if (!flag_gnu89_inline
1267 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (p))
1268 && scope != external_scope)
1269 pedwarn (input_location, 0,
1270 "inline function %q+D declared but never defined", p);
1271 DECL_EXTERNAL (p) = 1;
1277 /* Warnings for unused variables. */
1278 if ((!TREE_USED (p) || !DECL_READ_P (p))
1279 && !TREE_NO_WARNING (p)
1280 && !DECL_IN_SYSTEM_HEADER (p)
1282 && !DECL_ARTIFICIAL (p)
1283 && scope != file_scope
1284 && scope != external_scope)
1287 warning (OPT_Wunused_variable, "unused variable %q+D", p);
1288 else if (DECL_CONTEXT (p) == current_function_decl)
1289 warning_at (DECL_SOURCE_LOCATION (p),
1290 OPT_Wunused_but_set_variable,
1291 "variable %qD set but not used", p);
1296 error ("type of array %q+D completed incompatibly with"
1297 " implicit initialization", p);
1304 /* All of these go in BLOCK_VARS, but only if this is the
1305 binding in the home scope. */
1308 DECL_CHAIN (p) = BLOCK_VARS (block);
1309 BLOCK_VARS (block) = p;
1311 else if (VAR_OR_FUNCTION_DECL_P (p) && scope != file_scope)
1313 /* For block local externs add a special
1314 DECL_EXTERNAL decl for debug info generation. */
1315 tree extp = copy_node (p);
1317 DECL_EXTERNAL (extp) = 1;
1318 TREE_STATIC (extp) = 0;
1319 TREE_PUBLIC (extp) = 1;
1320 DECL_INITIAL (extp) = NULL_TREE;
1321 DECL_LANG_SPECIFIC (extp) = NULL;
1322 DECL_CONTEXT (extp) = current_function_decl;
1323 if (TREE_CODE (p) == FUNCTION_DECL)
1325 DECL_RESULT (extp) = NULL_TREE;
1326 DECL_SAVED_TREE (extp) = NULL_TREE;
1327 DECL_STRUCT_FUNCTION (extp) = NULL;
1329 if (b->locus != UNKNOWN_LOCATION)
1330 DECL_SOURCE_LOCATION (extp) = b->locus;
1331 DECL_CHAIN (extp) = BLOCK_VARS (block);
1332 BLOCK_VARS (block) = extp;
1334 /* If this is the file scope set DECL_CONTEXT of each decl to
1335 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1337 if (scope == file_scope)
1339 DECL_CONTEXT (p) = context;
1340 if (TREE_CODE (p) == TYPE_DECL
1341 && TREE_TYPE (p) != error_mark_node)
1342 set_type_context (TREE_TYPE (p), context);
1346 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1347 already been put there by store_parm_decls. Unused-
1348 parameter warnings are handled by function.c.
1349 error_mark_node obviously does not go in BLOCK_VARS and
1350 does not get unused-variable warnings. */
1353 /* It is possible for a decl not to have a name. We get
1354 here with b->id NULL in this case. */
1357 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
1358 I_SYMBOL_BINDING (b->id) = b->shadowed;
1359 if (b->shadowed && b->shadowed->u.type)
1360 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
1370 /* Dispose of the block that we just made inside some higher level. */
1371 if ((scope->function_body || scope == file_scope) && context)
1373 DECL_INITIAL (context) = block;
1374 BLOCK_SUPERCONTEXT (block) = context;
1376 else if (scope->outer)
1379 SCOPE_LIST_APPEND (scope->outer, blocks, block);
1380 /* If we did not make a block for the scope just exited, any
1381 blocks made for inner scopes must be carried forward so they
1382 will later become subblocks of something else. */
1383 else if (scope->blocks)
1384 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
1387 /* Pop the current scope, and free the structure for reuse. */
1388 current_scope = scope->outer;
1389 if (scope->function_body)
1390 current_function_scope = scope->outer_function;
1392 memset (scope, 0, sizeof (struct c_scope));
1393 scope->outer = scope_freelist;
1394 scope_freelist = scope;
1400 push_file_scope (void)
1408 file_scope = current_scope;
1410 start_fname_decls ();
1412 for (decl = visible_builtins; decl; decl = DECL_CHAIN (decl))
1413 bind (DECL_NAME (decl), decl, file_scope,
1414 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl));
1418 pop_file_scope (void)
1420 /* In case there were missing closebraces, get us back to the global
1422 while (current_scope != file_scope)
1425 /* __FUNCTION__ is defined at file scope (""). This
1426 call may not be necessary as my tests indicate it
1427 still works without it. */
1428 finish_fname_decls ();
1430 check_inline_statics ();
1432 /* This is the point to write out a PCH if we're doing that.
1433 In that case we do not want to do anything else. */
1436 c_common_write_pch ();
1440 /* Pop off the file scope and close this translation unit. */
1444 maybe_apply_pending_pragma_weaks ();
1447 /* Adjust the bindings for the start of a statement expression. */
1450 c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings)
1452 struct c_scope *scope;
1454 for (scope = current_scope; scope != NULL; scope = scope->outer)
1456 struct c_binding *b;
1458 if (!scope->has_label_bindings)
1461 for (b = scope->bindings; b != NULL; b = b->prev)
1463 struct c_label_vars *label_vars;
1465 struct c_goto_bindings *g;
1467 if (TREE_CODE (b->decl) != LABEL_DECL)
1469 label_vars = b->u.label;
1470 ++label_vars->label_bindings.stmt_exprs;
1471 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1472 ++g->goto_bindings.stmt_exprs;
1476 if (switch_bindings != NULL)
1477 ++switch_bindings->stmt_exprs;
1480 /* Adjust the bindings for the end of a statement expression. */
1483 c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings)
1485 struct c_scope *scope;
1487 for (scope = current_scope; scope != NULL; scope = scope->outer)
1489 struct c_binding *b;
1491 if (!scope->has_label_bindings)
1494 for (b = scope->bindings; b != NULL; b = b->prev)
1496 struct c_label_vars *label_vars;
1498 struct c_goto_bindings *g;
1500 if (TREE_CODE (b->decl) != LABEL_DECL)
1502 label_vars = b->u.label;
1503 --label_vars->label_bindings.stmt_exprs;
1504 if (label_vars->label_bindings.stmt_exprs < 0)
1506 label_vars->label_bindings.left_stmt_expr = true;
1507 label_vars->label_bindings.stmt_exprs = 0;
1509 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1511 --g->goto_bindings.stmt_exprs;
1512 if (g->goto_bindings.stmt_exprs < 0)
1514 g->goto_bindings.left_stmt_expr = true;
1515 g->goto_bindings.stmt_exprs = 0;
1521 if (switch_bindings != NULL)
1523 --switch_bindings->stmt_exprs;
1524 gcc_assert (switch_bindings->stmt_exprs >= 0);
1528 /* Push a definition or a declaration of struct, union or enum tag "name".
1529 "type" should be the type node.
1530 We assume that the tag "name" is not already defined, and has a location
1533 Note that the definition may really be just a forward reference.
1534 In that case, the TYPE_SIZE will be zero. */
1537 pushtag (location_t loc, tree name, tree type)
1539 /* Record the identifier as the type's name if it has none. */
1540 if (name && !TYPE_NAME (type))
1541 TYPE_NAME (type) = name;
1542 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc);
1544 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1545 tagged type we just added to the current scope. This fake
1546 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1547 to output a representation of a tagged type, and it also gives
1548 us a convenient place to record the "scope start" address for the
1551 TYPE_STUB_DECL (type) = pushdecl (build_decl (loc,
1552 TYPE_DECL, NULL_TREE, type));
1554 /* An approximation for now, so we can tell this is a function-scope tag.
1555 This will be updated in pop_scope. */
1556 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1558 if (warn_cxx_compat && name != NULL_TREE)
1560 struct c_binding *b = I_SYMBOL_BINDING (name);
1563 && b->decl != NULL_TREE
1564 && TREE_CODE (b->decl) == TYPE_DECL
1565 && (B_IN_CURRENT_SCOPE (b)
1566 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
1567 && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl))
1568 != TYPE_MAIN_VARIANT (type)))
1570 warning_at (loc, OPT_Wc___compat,
1571 ("using %qD as both a typedef and a tag is "
1574 if (b->locus != UNKNOWN_LOCATION)
1575 inform (b->locus, "originally defined here");
1580 /* An exported interface to pushtag. This is used by the gdb plugin's
1581 binding oracle to introduce a new tag binding. */
1584 c_pushtag (location_t loc, tree name, tree type)
1586 pushtag (loc, name, type);
1589 /* An exported interface to bind a declaration. LOC is the location
1590 to use. DECL is the declaration to bind. The decl's name is used
1591 to determine how it is bound. If DECL is a VAR_DECL, then
1592 IS_GLOBAL determines whether the decl is put into the global (file
1593 and external) scope or the current function's scope; if DECL is not
1594 a VAR_DECL then it is always put into the file scope. */
1597 c_bind (location_t loc, tree decl, bool is_global)
1599 struct c_scope *scope;
1600 bool nested = false;
1602 if (!VAR_P (decl) || current_function_scope == NULL)
1604 /* Types and functions are always considered to be global. */
1606 DECL_EXTERNAL (decl) = 1;
1607 TREE_PUBLIC (decl) = 1;
1611 /* Also bind it into the external scope. */
1612 bind (DECL_NAME (decl), decl, external_scope, true, false, loc);
1615 DECL_EXTERNAL (decl) = 1;
1616 TREE_PUBLIC (decl) = 1;
1620 DECL_CONTEXT (decl) = current_function_decl;
1621 TREE_PUBLIC (decl) = 0;
1622 scope = current_function_scope;
1625 bind (DECL_NAME (decl), decl, scope, false, nested, loc);
1628 /* Subroutine of compare_decls. Allow harmless mismatches in return
1629 and argument types provided that the type modes match. This function
1630 return a unified type given a suitable match, and 0 otherwise. */
1633 match_builtin_function_types (tree newtype, tree oldtype)
1635 tree newrettype, oldrettype;
1636 tree newargs, oldargs;
1637 tree trytype, tryargs;
1639 /* Accept the return type of the new declaration if same modes. */
1640 oldrettype = TREE_TYPE (oldtype);
1641 newrettype = TREE_TYPE (newtype);
1643 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1646 oldargs = TYPE_ARG_TYPES (oldtype);
1647 newargs = TYPE_ARG_TYPES (newtype);
1650 while (oldargs || newargs)
1654 || !TREE_VALUE (oldargs)
1655 || !TREE_VALUE (newargs)
1656 || TYPE_MODE (TREE_VALUE (oldargs))
1657 != TYPE_MODE (TREE_VALUE (newargs)))
1660 oldargs = TREE_CHAIN (oldargs);
1661 newargs = TREE_CHAIN (newargs);
1664 trytype = build_function_type (newrettype, tryargs);
1665 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1668 /* Subroutine of diagnose_mismatched_decls. Check for function type
1669 mismatch involving an empty arglist vs a nonempty one and give clearer
1672 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1673 tree newtype, tree oldtype)
1677 if (TREE_CODE (olddecl) != FUNCTION_DECL
1678 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1679 || !((!prototype_p (oldtype) && DECL_INITIAL (olddecl) == 0)
1680 || (!prototype_p (newtype) && DECL_INITIAL (newdecl) == 0)))
1683 t = TYPE_ARG_TYPES (oldtype);
1685 t = TYPE_ARG_TYPES (newtype);
1686 for (; t; t = TREE_CHAIN (t))
1688 tree type = TREE_VALUE (t);
1690 if (TREE_CHAIN (t) == 0
1691 && TYPE_MAIN_VARIANT (type) != void_type_node)
1693 inform (input_location, "a parameter list with an ellipsis can%'t match "
1694 "an empty parameter name list declaration");
1698 if (c_type_promotes_to (type) != type)
1700 inform (input_location, "an argument type that has a default promotion can%'t match "
1701 "an empty parameter name list declaration");
1707 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1708 old-style function definition, NEWDECL is a prototype declaration.
1709 Diagnose inconsistencies in the argument list. Returns TRUE if
1710 the prototype is compatible, FALSE if not. */
1712 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1714 tree newargs, oldargs;
1717 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1719 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1720 newargs = TYPE_ARG_TYPES (newtype);
1725 tree oldargtype = TREE_VALUE (oldargs);
1726 tree newargtype = TREE_VALUE (newargs);
1728 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1731 oldargtype = (TYPE_ATOMIC (oldargtype)
1732 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype),
1734 : TYPE_MAIN_VARIANT (oldargtype));
1735 newargtype = (TYPE_ATOMIC (newargtype)
1736 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype),
1738 : TYPE_MAIN_VARIANT (newargtype));
1740 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1743 /* Reaching the end of just one list means the two decls don't
1744 agree on the number of arguments. */
1745 if (END_OF_ARGLIST (oldargtype))
1747 error ("prototype for %q+D declares more arguments "
1748 "than previous old-style definition", newdecl);
1751 else if (END_OF_ARGLIST (newargtype))
1753 error ("prototype for %q+D declares fewer arguments "
1754 "than previous old-style definition", newdecl);
1758 /* Type for passing arg must be consistent with that declared
1760 else if (!comptypes (oldargtype, newargtype))
1762 error ("prototype for %q+D declares argument %d"
1763 " with incompatible type",
1768 oldargs = TREE_CHAIN (oldargs);
1769 newargs = TREE_CHAIN (newargs);
1773 /* If we get here, no errors were found, but do issue a warning
1774 for this poor-style construct. */
1775 warning (0, "prototype for %q+D follows non-prototype definition",
1778 #undef END_OF_ARGLIST
1781 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1782 first in a pair of mismatched declarations, using the diagnostic
1785 locate_old_decl (tree decl)
1787 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)
1788 && !C_DECL_DECLARED_BUILTIN (decl))
1790 else if (DECL_INITIAL (decl))
1791 inform (input_location, "previous definition of %q+D was here", decl);
1792 else if (C_DECL_IMPLICIT (decl))
1793 inform (input_location, "previous implicit declaration of %q+D was here", decl);
1795 inform (input_location, "previous declaration of %q+D was here", decl);
1798 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1799 Returns true if the caller should proceed to merge the two, false
1800 if OLDDECL should simply be discarded. As a side effect, issues
1801 all necessary diagnostics for invalid or poor-style combinations.
1802 If it returns true, writes the types of NEWDECL and OLDDECL to
1803 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1804 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1807 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1808 tree *newtypep, tree *oldtypep)
1810 tree newtype, oldtype;
1811 bool pedwarned = false;
1812 bool warned = false;
1815 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1816 && DECL_EXTERNAL (DECL))
1818 /* If we have error_mark_node for either decl or type, just discard
1819 the previous decl - we're in an error cascade already. */
1820 if (olddecl == error_mark_node || newdecl == error_mark_node)
1822 *oldtypep = oldtype = TREE_TYPE (olddecl);
1823 *newtypep = newtype = TREE_TYPE (newdecl);
1824 if (oldtype == error_mark_node || newtype == error_mark_node)
1827 /* Two different categories of symbol altogether. This is an error
1828 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1829 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1831 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1832 && DECL_BUILT_IN (olddecl)
1833 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1835 error ("%q+D redeclared as different kind of symbol", newdecl);
1836 locate_old_decl (olddecl);
1838 else if (TREE_PUBLIC (newdecl))
1839 warning (0, "built-in function %q+D declared as non-function",
1842 warning (OPT_Wshadow, "declaration of %q+D shadows "
1843 "a built-in function", newdecl);
1847 /* Enumerators have no linkage, so may only be declared once in a
1849 if (TREE_CODE (olddecl) == CONST_DECL)
1851 error ("redeclaration of enumerator %q+D", newdecl);
1852 locate_old_decl (olddecl);
1856 if (!comptypes (oldtype, newtype))
1858 if (TREE_CODE (olddecl) == FUNCTION_DECL
1859 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1861 /* Accept harmless mismatch in function types.
1862 This is for the ffs and fprintf builtins. */
1863 tree trytype = match_builtin_function_types (newtype, oldtype);
1865 if (trytype && comptypes (newtype, trytype))
1866 *oldtypep = oldtype = trytype;
1869 /* If types don't match for a built-in, throw away the
1870 built-in. No point in calling locate_old_decl here, it
1871 won't print anything. */
1872 warning (0, "conflicting types for built-in function %q+D",
1877 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1878 && DECL_IS_BUILTIN (olddecl))
1880 /* A conflicting function declaration for a predeclared
1881 function that isn't actually built in. Objective C uses
1882 these. The new declaration silently overrides everything
1883 but the volatility (i.e. noreturn) indication. See also
1884 below. FIXME: Make Objective C use normal builtins. */
1885 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1888 /* Permit void foo (...) to match int foo (...) if the latter is
1889 the definition and implicit int was used. See
1890 c-torture/compile/920625-2.c. */
1891 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1892 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1893 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1894 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1896 pedwarned = pedwarn (input_location, 0,
1897 "conflicting types for %q+D", newdecl);
1898 /* Make sure we keep void as the return type. */
1899 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1900 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1902 /* Permit void foo (...) to match an earlier call to foo (...) with
1903 no declared type (thus, implicitly int). */
1904 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1905 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1906 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1907 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1909 pedwarned = pedwarn (input_location, 0,
1910 "conflicting types for %q+D", newdecl);
1911 /* Make sure we keep void as the return type. */
1912 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1916 int new_quals = TYPE_QUALS (newtype);
1917 int old_quals = TYPE_QUALS (oldtype);
1919 if (new_quals != old_quals)
1921 addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals);
1922 addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals);
1923 if (new_addr != old_addr)
1925 if (ADDR_SPACE_GENERIC_P (new_addr))
1926 error ("conflicting named address spaces (generic vs %s) "
1928 c_addr_space_name (old_addr), newdecl);
1929 else if (ADDR_SPACE_GENERIC_P (old_addr))
1930 error ("conflicting named address spaces (%s vs generic) "
1932 c_addr_space_name (new_addr), newdecl);
1934 error ("conflicting named address spaces (%s vs %s) "
1936 c_addr_space_name (new_addr),
1937 c_addr_space_name (old_addr),
1941 if (CLEAR_QUAL_ADDR_SPACE (new_quals)
1942 != CLEAR_QUAL_ADDR_SPACE (old_quals))
1943 error ("conflicting type qualifiers for %q+D", newdecl);
1946 error ("conflicting types for %q+D", newdecl);
1947 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1948 locate_old_decl (olddecl);
1953 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1954 but silently ignore the redeclaration if either is in a system
1955 header. (Conflicting redeclarations were handled above.) This
1956 is allowed for C11 if the types are the same, not just
1958 if (TREE_CODE (newdecl) == TYPE_DECL)
1960 bool types_different = false;
1961 int comptypes_result;
1964 = comptypes_check_different_types (oldtype, newtype, &types_different);
1966 if (comptypes_result != 1 || types_different)
1968 error ("redefinition of typedef %q+D with different type", newdecl);
1969 locate_old_decl (olddecl);
1973 if (DECL_IN_SYSTEM_HEADER (newdecl)
1974 || DECL_IN_SYSTEM_HEADER (olddecl)
1975 || TREE_NO_WARNING (newdecl)
1976 || TREE_NO_WARNING (olddecl))
1977 return true; /* Allow OLDDECL to continue in use. */
1979 if (variably_modified_type_p (newtype, NULL))
1981 error ("redefinition of typedef %q+D with variably modified type",
1983 locate_old_decl (olddecl);
1985 else if (pedwarn_c99 (input_location, OPT_Wpedantic,
1986 "redefinition of typedef %q+D", newdecl))
1987 locate_old_decl (olddecl);
1992 /* Function declarations can either be 'static' or 'extern' (no
1993 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1994 can never conflict with each other on account of linkage
1995 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1996 gnu89 mode permits two definitions if one is 'extern inline' and
1997 one is not. The non- extern-inline definition supersedes the
1998 extern-inline definition. */
2000 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2002 /* If you declare a built-in function name as static, or
2003 define the built-in with an old-style definition (so we
2004 can't validate the argument list) the built-in definition is
2005 overridden, but optionally warn this was a bad choice of name. */
2006 if (DECL_BUILT_IN (olddecl)
2007 && !C_DECL_DECLARED_BUILTIN (olddecl)
2008 && (!TREE_PUBLIC (newdecl)
2009 || (DECL_INITIAL (newdecl)
2010 && !prototype_p (TREE_TYPE (newdecl)))))
2012 warning (OPT_Wshadow, "declaration of %q+D shadows "
2013 "a built-in function", newdecl);
2014 /* Discard the old built-in function. */
2018 if (DECL_INITIAL (newdecl))
2020 if (DECL_INITIAL (olddecl))
2022 /* If both decls are in the same TU and the new declaration
2023 isn't overriding an extern inline reject the new decl.
2024 In c99, no overriding is allowed in the same translation
2026 if ((!DECL_EXTERN_INLINE (olddecl)
2027 || DECL_EXTERN_INLINE (newdecl)
2028 || (!flag_gnu89_inline
2029 && (!DECL_DECLARED_INLINE_P (olddecl)
2030 || !lookup_attribute ("gnu_inline",
2031 DECL_ATTRIBUTES (olddecl)))
2032 && (!DECL_DECLARED_INLINE_P (newdecl)
2033 || !lookup_attribute ("gnu_inline",
2034 DECL_ATTRIBUTES (newdecl))))
2036 && same_translation_unit_p (newdecl, olddecl))
2038 error ("redefinition of %q+D", newdecl);
2039 locate_old_decl (olddecl);
2044 /* If we have a prototype after an old-style function definition,
2045 the argument types must be checked specially. */
2046 else if (DECL_INITIAL (olddecl)
2047 && !prototype_p (oldtype) && prototype_p (newtype)
2048 && TYPE_ACTUAL_ARG_TYPES (oldtype)
2049 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
2051 locate_old_decl (olddecl);
2054 /* A non-static declaration (even an "extern") followed by a
2055 static declaration is undefined behavior per C99 6.2.2p3-5,7.
2056 The same is true for a static forward declaration at block
2057 scope followed by a non-static declaration/definition at file
2058 scope. Static followed by non-static at the same scope is
2059 not undefined behavior, and is the most convenient way to get
2060 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
2061 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
2062 we do diagnose it if -Wtraditional. */
2063 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
2065 /* Two exceptions to the rule. If olddecl is an extern
2066 inline, or a predeclared function that isn't actually
2067 built in, newdecl silently overrides olddecl. The latter
2068 occur only in Objective C; see also above. (FIXME: Make
2069 Objective C use normal builtins.) */
2070 if (!DECL_IS_BUILTIN (olddecl)
2071 && !DECL_EXTERN_INLINE (olddecl))
2073 error ("static declaration of %q+D follows "
2074 "non-static declaration", newdecl);
2075 locate_old_decl (olddecl);
2079 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
2081 if (DECL_CONTEXT (olddecl))
2083 error ("non-static declaration of %q+D follows "
2084 "static declaration", newdecl);
2085 locate_old_decl (olddecl);
2088 else if (warn_traditional)
2090 warned |= warning (OPT_Wtraditional,
2091 "non-static declaration of %q+D "
2092 "follows static declaration", newdecl);
2096 /* Make sure gnu_inline attribute is either not present, or
2097 present on all inline decls. */
2098 if (DECL_DECLARED_INLINE_P (olddecl)
2099 && DECL_DECLARED_INLINE_P (newdecl))
2101 bool newa = lookup_attribute ("gnu_inline",
2102 DECL_ATTRIBUTES (newdecl)) != NULL;
2103 bool olda = lookup_attribute ("gnu_inline",
2104 DECL_ATTRIBUTES (olddecl)) != NULL;
2107 error_at (input_location, "%<gnu_inline%> attribute present on %q+D",
2108 newa ? newdecl : olddecl);
2109 error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl),
2114 else if (VAR_P (newdecl))
2116 /* Only variables can be thread-local, and all declarations must
2117 agree on this property. */
2118 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
2120 /* Nothing to check. Since OLDDECL is marked threadprivate
2121 and NEWDECL does not have a thread-local attribute, we
2122 will merge the threadprivate attribute into NEWDECL. */
2125 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
2127 if (DECL_THREAD_LOCAL_P (newdecl))
2128 error ("thread-local declaration of %q+D follows "
2129 "non-thread-local declaration", newdecl);
2131 error ("non-thread-local declaration of %q+D follows "
2132 "thread-local declaration", newdecl);
2134 locate_old_decl (olddecl);
2138 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2139 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
2141 error ("redefinition of %q+D", newdecl);
2142 locate_old_decl (olddecl);
2146 /* Objects declared at file scope: if the first declaration had
2147 external linkage (even if it was an external reference) the
2148 second must have external linkage as well, or the behavior is
2149 undefined. If the first declaration had internal linkage, then
2150 the second must too, or else be an external reference (in which
2151 case the composite declaration still has internal linkage).
2152 As for function declarations, we warn about the static-then-
2153 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2154 if (DECL_FILE_SCOPE_P (newdecl)
2155 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
2157 if (DECL_EXTERNAL (newdecl))
2159 if (!DECL_FILE_SCOPE_P (olddecl))
2161 error ("extern declaration of %q+D follows "
2162 "declaration with no linkage", newdecl);
2163 locate_old_decl (olddecl);
2166 else if (warn_traditional)
2168 warned |= warning (OPT_Wtraditional,
2169 "non-static declaration of %q+D "
2170 "follows static declaration", newdecl);
2175 if (TREE_PUBLIC (newdecl))
2176 error ("non-static declaration of %q+D follows "
2177 "static declaration", newdecl);
2179 error ("static declaration of %q+D follows "
2180 "non-static declaration", newdecl);
2182 locate_old_decl (olddecl);
2186 /* Two objects with the same name declared at the same block
2187 scope must both be external references (6.7p3). */
2188 else if (!DECL_FILE_SCOPE_P (newdecl))
2190 if (DECL_EXTERNAL (newdecl))
2192 /* Extern with initializer at block scope, which will
2193 already have received an error. */
2195 else if (DECL_EXTERNAL (olddecl))
2197 error ("declaration of %q+D with no linkage follows "
2198 "extern declaration", newdecl);
2199 locate_old_decl (olddecl);
2203 error ("redeclaration of %q+D with no linkage", newdecl);
2204 locate_old_decl (olddecl);
2210 /* C++ does not permit a decl to appear multiple times at file
2213 && DECL_FILE_SCOPE_P (newdecl)
2214 && !DECL_EXTERNAL (newdecl)
2215 && !DECL_EXTERNAL (olddecl))
2216 warned |= warning_at (DECL_SOURCE_LOCATION (newdecl),
2218 ("duplicate declaration of %qD is "
2224 /* All decls must agree on a visibility. */
2225 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
2226 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
2227 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2229 warned |= warning (0, "redeclaration of %q+D with different visibility "
2230 "(old visibility preserved)", newdecl);
2233 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2235 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2236 if (DECL_DECLARED_INLINE_P (newdecl)
2237 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2238 warned |= warning (OPT_Wattributes,
2239 "inline declaration of %qD follows "
2240 "declaration with attribute noinline", newdecl);
2241 else if (DECL_DECLARED_INLINE_P (olddecl)
2242 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
2243 warned |= warning (OPT_Wattributes,
2244 "declaration of %q+D with attribute "
2245 "noinline follows inline declaration ", newdecl);
2246 else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl))
2247 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl)))
2248 warned |= warning (OPT_Wattributes,
2249 "declaration of %q+D with attribute "
2250 "%qs follows declaration with attribute %qs",
2251 newdecl, "noinline", "always_inline");
2252 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl))
2253 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2254 warned |= warning (OPT_Wattributes,
2255 "declaration of %q+D with attribute "
2256 "%qs follows declaration with attribute %qs",
2257 newdecl, "always_inline", "noinline");
2258 else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl))
2259 && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl)))
2260 warned |= warning (OPT_Wattributes,
2261 "declaration of %q+D with attribute %qs follows "
2262 "declaration with attribute %qs", newdecl, "cold",
2264 else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl))
2265 && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl)))
2266 warned |= warning (OPT_Wattributes,
2267 "declaration of %q+D with attribute %qs follows "
2268 "declaration with attribute %qs", newdecl, "hot",
2271 else /* PARM_DECL, VAR_DECL */
2273 /* Redeclaration of a parameter is a constraint violation (this is
2274 not explicitly stated, but follows from C99 6.7p3 [no more than
2275 one declaration of the same identifier with no linkage in the
2276 same scope, except type tags] and 6.2.2p6 [parameters have no
2277 linkage]). We must check for a forward parameter declaration,
2278 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2279 an extension, the mandatory diagnostic for which is handled by
2280 mark_forward_parm_decls. */
2282 if (TREE_CODE (newdecl) == PARM_DECL
2283 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
2285 error ("redefinition of parameter %q+D", newdecl);
2286 locate_old_decl (olddecl);
2291 /* Optional warning for completely redundant decls. */
2292 if (!warned && !pedwarned
2293 && warn_redundant_decls
2294 /* Don't warn about a function declaration followed by a
2296 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2297 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
2298 /* Don't warn about redundant redeclarations of builtins. */
2299 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2300 && !DECL_BUILT_IN (newdecl)
2301 && DECL_BUILT_IN (olddecl)
2302 && !C_DECL_DECLARED_BUILTIN (olddecl))
2303 /* Don't warn about an extern followed by a definition. */
2304 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
2305 /* Don't warn about forward parameter decls. */
2306 && !(TREE_CODE (newdecl) == PARM_DECL
2307 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2308 /* Don't warn about a variable definition following a declaration. */
2309 && !(VAR_P (newdecl)
2310 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
2312 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
2316 /* Report location of previous decl/defn. */
2317 if (warned || pedwarned)
2318 locate_old_decl (olddecl);
2320 #undef DECL_EXTERN_INLINE
2325 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2326 consistent with OLDDECL, but carries new information. Merge the
2327 new information into OLDDECL. This function issues no
2331 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
2333 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
2334 && DECL_INITIAL (newdecl) != 0);
2335 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
2336 && prototype_p (TREE_TYPE (newdecl)));
2337 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
2338 && prototype_p (TREE_TYPE (olddecl)));
2340 /* For real parm decl following a forward decl, rechain the old decl
2341 in its new location and clear TREE_ASM_WRITTEN (it's not a
2342 forward decl anymore). */
2343 if (TREE_CODE (newdecl) == PARM_DECL
2344 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2346 struct c_binding *b, **here;
2348 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
2349 if ((*here)->decl == olddecl)
2356 b->prev = current_scope->bindings;
2357 current_scope->bindings = b;
2359 TREE_ASM_WRITTEN (olddecl) = 0;
2362 DECL_ATTRIBUTES (newdecl)
2363 = targetm.merge_decl_attributes (olddecl, newdecl);
2365 /* Merge the data types specified in the two decls. */
2367 = TREE_TYPE (olddecl)
2368 = composite_type (newtype, oldtype);
2370 /* Lay the type out, unless already done. */
2371 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
2373 if (TREE_TYPE (newdecl) != error_mark_node)
2374 layout_type (TREE_TYPE (newdecl));
2375 if (TREE_CODE (newdecl) != FUNCTION_DECL
2376 && TREE_CODE (newdecl) != TYPE_DECL
2377 && TREE_CODE (newdecl) != CONST_DECL)
2378 layout_decl (newdecl, 0);
2382 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2383 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
2384 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
2385 DECL_MODE (newdecl) = DECL_MODE (olddecl);
2386 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2388 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2389 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2393 /* Keep the old rtl since we can safely use it. */
2394 if (HAS_RTL_P (olddecl))
2395 COPY_DECL_RTL (olddecl, newdecl);
2397 /* Merge the type qualifiers. */
2398 if (TREE_READONLY (newdecl))
2399 TREE_READONLY (olddecl) = 1;
2401 if (TREE_THIS_VOLATILE (newdecl))
2402 TREE_THIS_VOLATILE (olddecl) = 1;
2404 /* Merge deprecatedness. */
2405 if (TREE_DEPRECATED (newdecl))
2406 TREE_DEPRECATED (olddecl) = 1;
2408 /* If a decl is in a system header and the other isn't, keep the one on the
2409 system header. Otherwise, keep source location of definition rather than
2410 declaration and of prototype rather than non-prototype unless that
2411 prototype is built-in. */
2412 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2413 && DECL_IN_SYSTEM_HEADER (olddecl)
2414 && !DECL_IN_SYSTEM_HEADER (newdecl) )
2415 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2416 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2417 && DECL_IN_SYSTEM_HEADER (newdecl)
2418 && !DECL_IN_SYSTEM_HEADER (olddecl))
2419 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
2420 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
2421 || (old_is_prototype && !new_is_prototype
2422 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
2423 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2425 /* Merge the initialization information. */
2426 if (DECL_INITIAL (newdecl) == 0)
2427 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2429 /* Merge the threadprivate attribute. */
2430 if (VAR_P (olddecl) && C_DECL_THREADPRIVATE_P (olddecl))
2431 C_DECL_THREADPRIVATE_P (newdecl) = 1;
2433 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
2435 /* Copy the assembler name.
2436 Currently, it can only be defined in the prototype. */
2437 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2439 /* Use visibility of whichever declaration had it specified */
2440 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2442 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2443 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2446 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2448 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2449 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2450 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2451 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2452 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2453 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2454 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2455 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2456 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2457 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2458 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
2461 /* Merge the storage class information. */
2462 merge_weak (newdecl, olddecl);
2464 /* For functions, static overrides non-static. */
2465 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2467 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2468 /* This is since we don't automatically
2469 copy the attributes of NEWDECL into OLDDECL. */
2470 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2471 /* If this clears `static', clear it in the identifier too. */
2472 if (!TREE_PUBLIC (olddecl))
2473 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2477 /* In c99, 'extern' declaration before (or after) 'inline' means this
2478 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2480 if (TREE_CODE (newdecl) == FUNCTION_DECL
2481 && !flag_gnu89_inline
2482 && (DECL_DECLARED_INLINE_P (newdecl)
2483 || DECL_DECLARED_INLINE_P (olddecl))
2484 && (!DECL_DECLARED_INLINE_P (newdecl)
2485 || !DECL_DECLARED_INLINE_P (olddecl)
2486 || !DECL_EXTERNAL (olddecl))
2487 && DECL_EXTERNAL (newdecl)
2488 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
2489 && !current_function_decl)
2490 DECL_EXTERNAL (newdecl) = 0;
2492 /* An inline definition following a static declaration is not
2494 if (new_is_definition
2495 && (DECL_DECLARED_INLINE_P (newdecl)
2496 || DECL_DECLARED_INLINE_P (olddecl))
2497 && !TREE_PUBLIC (olddecl))
2498 DECL_EXTERNAL (newdecl) = 0;
2500 if (DECL_EXTERNAL (newdecl))
2502 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2503 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2505 /* An extern decl does not override previous storage class. */
2506 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2507 if (!DECL_EXTERNAL (newdecl))
2509 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2510 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2515 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2516 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2519 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2521 /* If we're redefining a function previously defined as extern
2522 inline, make sure we emit debug info for the inline before we
2523 throw it away, in case it was inlined into a function that
2524 hasn't been written out yet. */
2525 if (new_is_definition && DECL_INITIAL (olddecl))
2526 /* The new defn must not be inline. */
2527 DECL_UNINLINABLE (newdecl) = 1;
2530 /* If either decl says `inline', this fn is inline, unless
2531 its definition was passed already. */
2532 if (DECL_DECLARED_INLINE_P (newdecl)
2533 || DECL_DECLARED_INLINE_P (olddecl))
2534 DECL_DECLARED_INLINE_P (newdecl) = 1;
2536 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2537 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2539 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2540 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2541 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2542 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2545 if (DECL_BUILT_IN (olddecl))
2547 /* If redeclaring a builtin function, it stays built in.
2548 But it gets tagged as having been declared. */
2549 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2550 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2551 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
2552 if (new_is_prototype)
2554 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
2555 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2557 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2560 /* If a compatible prototype of these builtin functions
2561 is seen, assume the runtime implements it with the
2562 expected semantics. */
2563 case BUILT_IN_STPCPY:
2564 if (builtin_decl_explicit_p (fncode))
2565 set_builtin_decl_implicit_p (fncode, true);
2568 if (builtin_decl_explicit_p (fncode))
2569 set_builtin_decl_declared_p (fncode, true);
2575 C_DECL_BUILTIN_PROTOTYPE (newdecl)
2576 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
2579 /* Preserve function specific target and optimization options */
2580 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2581 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2582 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2583 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2585 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2586 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2587 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2588 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2590 /* Also preserve various other info from the definition. */
2591 if (!new_is_definition)
2594 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2595 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2596 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2597 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2598 DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl));
2599 for (t = DECL_ARGUMENTS (newdecl); t ; t = DECL_CHAIN (t))
2600 DECL_CONTEXT (t) = newdecl;
2602 /* See if we've got a function to instantiate from. */
2603 if (DECL_SAVED_TREE (olddecl))
2604 DECL_ABSTRACT_ORIGIN (newdecl)
2605 = DECL_ABSTRACT_ORIGIN (olddecl);
2609 /* Merge the USED information. */
2610 if (TREE_USED (olddecl))
2611 TREE_USED (newdecl) = 1;
2612 else if (TREE_USED (newdecl))
2613 TREE_USED (olddecl) = 1;
2614 if (VAR_P (olddecl) || TREE_CODE (olddecl) == PARM_DECL)
2615 DECL_READ_P (newdecl) |= DECL_READ_P (olddecl);
2616 if (DECL_PRESERVE_P (olddecl))
2617 DECL_PRESERVE_P (newdecl) = 1;
2618 else if (DECL_PRESERVE_P (newdecl))
2619 DECL_PRESERVE_P (olddecl) = 1;
2621 /* Merge DECL_COMMON */
2622 if (VAR_P (olddecl) && VAR_P (newdecl)
2623 && !lookup_attribute ("common", DECL_ATTRIBUTES (newdecl))
2624 && !lookup_attribute ("nocommon", DECL_ATTRIBUTES (newdecl)))
2625 DECL_COMMON (newdecl) = DECL_COMMON (newdecl) && DECL_COMMON (olddecl);
2627 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2628 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2629 DECL_ARGUMENTS (if appropriate). */
2631 unsigned olddecl_uid = DECL_UID (olddecl);
2632 tree olddecl_context = DECL_CONTEXT (olddecl);
2633 tree olddecl_arguments = NULL;
2634 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2635 olddecl_arguments = DECL_ARGUMENTS (olddecl);
2637 memcpy ((char *) olddecl + sizeof (struct tree_common),
2638 (char *) newdecl + sizeof (struct tree_common),
2639 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2640 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2641 switch (TREE_CODE (olddecl))
2646 struct symtab_node *snode = olddecl->decl_with_vis.symtab_node;
2648 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2649 (char *) newdecl + sizeof (struct tree_decl_common),
2650 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2651 olddecl->decl_with_vis.symtab_node = snode;
2653 if ((DECL_EXTERNAL (olddecl)
2654 || TREE_PUBLIC (olddecl)
2655 || TREE_STATIC (olddecl))
2656 && DECL_SECTION_NAME (newdecl) != NULL)
2657 set_decl_section_name (olddecl, DECL_SECTION_NAME (newdecl));
2659 /* This isn't quite correct for something like
2660 int __thread x attribute ((tls_model ("local-exec")));
2661 extern int __thread x;
2662 as we'll lose the "local-exec" model. */
2663 if (VAR_P (olddecl) && DECL_THREAD_LOCAL_P (newdecl))
2664 set_decl_tls_model (olddecl, DECL_TLS_MODEL (newdecl));
2674 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2675 (char *) newdecl + sizeof (struct tree_decl_common),
2676 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2681 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2682 (char *) newdecl + sizeof (struct tree_decl_common),
2683 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
2685 DECL_UID (olddecl) = olddecl_uid;
2686 DECL_CONTEXT (olddecl) = olddecl_context;
2687 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2688 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
2691 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2692 so that encode_section_info has a chance to look at the new decl
2693 flags and attributes. */
2694 if (DECL_RTL_SET_P (olddecl)
2695 && (TREE_CODE (olddecl) == FUNCTION_DECL
2696 || (VAR_P (olddecl) && TREE_STATIC (olddecl))))
2697 make_decl_rtl (olddecl);
2700 /* Handle when a new declaration NEWDECL has the same name as an old
2701 one OLDDECL in the same binding contour. Prints an error message
2704 If safely possible, alter OLDDECL to look like NEWDECL, and return
2705 true. Otherwise, return false. */
2708 duplicate_decls (tree newdecl, tree olddecl)
2710 tree newtype = NULL, oldtype = NULL;
2712 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
2714 /* Avoid `unused variable' and other warnings for OLDDECL. */
2715 TREE_NO_WARNING (olddecl) = 1;
2719 merge_decls (newdecl, olddecl, newtype, oldtype);
2721 /* The NEWDECL will no longer be needed.
2723 Before releasing the node, be sure to remove function from symbol
2724 table that might have been inserted there to record comdat group.
2725 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2726 structure is shared in between NEWDECL and OLDECL. */
2727 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2728 DECL_STRUCT_FUNCTION (newdecl) = NULL;
2729 if (VAR_OR_FUNCTION_DECL_P (newdecl))
2731 struct symtab_node *snode = symtab_node::get (newdecl);
2740 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2742 warn_if_shadowing (tree new_decl)
2744 struct c_binding *b;
2746 /* Shadow warnings wanted? */
2748 /* No shadow warnings for internally generated vars. */
2749 || DECL_IS_BUILTIN (new_decl)
2750 /* No shadow warnings for vars made for inlining. */
2751 || DECL_FROM_INLINE (new_decl))
2754 /* Is anything being shadowed? Invisible decls do not count. */
2755 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
2756 if (b->decl && b->decl != new_decl && !b->invisible
2757 && (b->decl == error_mark_node
2758 || diagnostic_report_warnings_p (global_dc,
2759 DECL_SOURCE_LOCATION (b->decl))))
2761 tree old_decl = b->decl;
2762 bool warned = false;
2764 if (old_decl == error_mark_node)
2766 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
2767 "non-variable", new_decl);
2770 else if (TREE_CODE (old_decl) == PARM_DECL)
2771 warned = warning (OPT_Wshadow,
2772 "declaration of %q+D shadows a parameter",
2774 else if (DECL_FILE_SCOPE_P (old_decl))
2776 /* Do not warn if a variable shadows a function, unless
2777 the variable is a function or a pointer-to-function. */
2778 if (TREE_CODE (old_decl) == FUNCTION_DECL
2779 && TREE_CODE (new_decl) != FUNCTION_DECL
2780 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl)))
2783 warned = warning_at (DECL_SOURCE_LOCATION (new_decl), OPT_Wshadow,
2784 "declaration of %qD shadows a global "
2788 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2789 && DECL_BUILT_IN (old_decl))
2791 warning (OPT_Wshadow, "declaration of %q+D shadows "
2792 "a built-in function", new_decl);
2796 warned = warning (OPT_Wshadow, "declaration of %q+D shadows a "
2797 "previous local", new_decl);
2800 inform (DECL_SOURCE_LOCATION (old_decl),
2801 "shadowed declaration is here");
2807 /* Record a decl-node X as belonging to the current lexical scope.
2808 Check for errors (such as an incompatible declaration for the same
2809 name already seen in the same scope).
2811 Returns either X or an old decl for the same name.
2812 If an old decl is returned, it may have been smashed
2813 to agree with what X says. */
2818 tree name = DECL_NAME (x);
2819 struct c_scope *scope = current_scope;
2820 struct c_binding *b;
2821 bool nested = false;
2822 location_t locus = DECL_SOURCE_LOCATION (x);
2824 /* Must set DECL_CONTEXT for everything not at file scope or
2825 DECL_FILE_SCOPE_P won't work. Local externs don't count
2826 unless they have initializers (which generate code). */
2827 if (current_function_decl
2828 && (!VAR_OR_FUNCTION_DECL_P (x)
2829 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2830 DECL_CONTEXT (x) = current_function_decl;
2832 /* Anonymous decls are just inserted in the scope. */
2835 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
2840 /* First, see if there is another declaration with the same name in
2841 the current scope. If there is, duplicate_decls may do all the
2842 work for us. If duplicate_decls returns false, that indicates
2843 two incompatible decls in the same scope; we are to silently
2844 replace the old one (duplicate_decls has issued all appropriate
2845 diagnostics). In particular, we should not consider possible
2846 duplicates in the external scope, or shadowing. */
2847 b = I_SYMBOL_BINDING (name);
2848 if (b && B_IN_SCOPE (b, scope))
2850 struct c_binding *b_ext, *b_use;
2851 tree type = TREE_TYPE (x);
2852 tree visdecl = b->decl;
2853 tree vistype = TREE_TYPE (visdecl);
2854 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2855 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2856 b->inner_comp = false;
2859 /* If this is an external linkage declaration, we should check
2860 for compatibility with the type in the external scope before
2861 setting the type at this scope based on the visible
2862 information only. */
2863 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2865 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2866 b_ext = b_ext->shadowed;
2871 TREE_TYPE (b_use->decl) = b_use->u.type;
2874 if (duplicate_decls (x, b_use->decl))
2878 /* Save the updated type in the external scope and
2879 restore the proper type for this scope. */
2881 if (comptypes (vistype, type))
2882 thistype = composite_type (vistype, type);
2884 thistype = TREE_TYPE (b_use->decl);
2885 b_use->u.type = TREE_TYPE (b_use->decl);
2886 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2887 && DECL_BUILT_IN (b_use->decl))
2889 = build_type_attribute_variant (thistype,
2892 TREE_TYPE (b_use->decl) = thistype;
2897 goto skip_external_and_shadow_checks;
2900 /* All declarations with external linkage, and all external
2901 references, go in the external scope, no matter what scope is
2902 current. However, the binding in that scope is ignored for
2903 purposes of normal name lookup. A separate binding structure is
2904 created in the requested scope; this governs the normal
2905 visibility of the symbol.
2907 The binding in the externals scope is used exclusively for
2908 detecting duplicate declarations of the same object, no matter
2909 what scope they are in; this is what we do here. (C99 6.2.7p2:
2910 All declarations that refer to the same object or function shall
2911 have compatible type; otherwise, the behavior is undefined.) */
2912 if (DECL_EXTERNAL (x) || scope == file_scope)
2914 tree type = TREE_TYPE (x);
2917 bool type_saved = false;
2918 if (b && !B_IN_EXTERNAL_SCOPE (b)
2919 && VAR_OR_FUNCTION_DECL_P (b->decl)
2920 && DECL_FILE_SCOPE_P (b->decl))
2923 vistype = TREE_TYPE (visdecl);
2925 if (scope != file_scope
2926 && !DECL_IN_SYSTEM_HEADER (x))
2927 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2929 while (b && !B_IN_EXTERNAL_SCOPE (b))
2931 /* If this decl might be modified, save its type. This is
2932 done here rather than when the decl is first bound
2933 because the type may change after first binding, through
2934 being completed or through attributes being added. If we
2935 encounter multiple such decls, only the first should have
2936 its type saved; the others will already have had their
2937 proper types saved and the types will not have changed as
2938 their scopes will not have been re-entered. */
2939 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2941 b->u.type = TREE_TYPE (b->decl);
2944 if (B_IN_FILE_SCOPE (b)
2946 && TREE_STATIC (b->decl)
2947 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2948 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2949 && TREE_CODE (type) == ARRAY_TYPE
2950 && TYPE_DOMAIN (type)
2951 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2952 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2954 /* Array type completed in inner scope, which should be
2955 diagnosed if the completion does not have size 1 and
2956 it does not get completed in the file scope. */
2957 b->inner_comp = true;
2962 /* If a matching external declaration has been found, set its
2963 type to the composite of all the types of that declaration.
2964 After the consistency checks, it will be reset to the
2965 composite of the visible types only. */
2966 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2968 TREE_TYPE (b->decl) = b->u.type;
2970 /* The point of the same_translation_unit_p check here is,
2971 we want to detect a duplicate decl for a construct like
2972 foo() { extern bar(); } ... static bar(); but not if
2973 they are in different translation units. In any case,
2974 the static does not go in the externals scope. */
2976 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2977 && duplicate_decls (x, b->decl))
2982 if (comptypes (vistype, type))
2983 thistype = composite_type (vistype, type);
2985 thistype = TREE_TYPE (b->decl);
2989 b->u.type = TREE_TYPE (b->decl);
2990 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2992 = build_type_attribute_variant (thistype,
2993 TYPE_ATTRIBUTES (b->u.type));
2994 TREE_TYPE (b->decl) = thistype;
2995 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
2999 else if (TREE_PUBLIC (x))
3001 if (visdecl && !b && duplicate_decls (x, visdecl))
3003 /* An external declaration at block scope referring to a
3004 visible entity with internal linkage. The composite
3005 type will already be correct for this scope, so we
3006 just need to fall through to make the declaration in
3013 bind (name, x, external_scope, /*invisible=*/true,
3014 /*nested=*/false, locus);
3020 if (TREE_CODE (x) != PARM_DECL)
3021 warn_if_shadowing (x);
3023 skip_external_and_shadow_checks:
3024 if (TREE_CODE (x) == TYPE_DECL)
3026 /* So this is a typedef, set its underlying type. */
3027 set_underlying_type (x);
3029 /* If X is a typedef defined in the current function, record it
3030 for the purpose of implementing the -Wunused-local-typedefs
3032 record_locally_defined_typedef (x);
3035 bind (name, x, scope, /*invisible=*/false, nested, locus);
3037 /* If x's type is incomplete because it's based on a
3038 structure or union which has not yet been fully declared,
3039 attach it to that structure or union type, so we can go
3040 back and complete the variable declaration later, if the
3041 structure or union gets fully declared.
3043 If the input is erroneous, we can have error_mark in the type
3044 slot (e.g. "f(void a, ...)") - that doesn't count as an
3046 if (TREE_TYPE (x) != error_mark_node
3047 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
3049 tree element = TREE_TYPE (x);
3051 while (TREE_CODE (element) == ARRAY_TYPE)
3052 element = TREE_TYPE (element);
3053 element = TYPE_MAIN_VARIANT (element);
3055 if ((TREE_CODE (element) == RECORD_TYPE
3056 || TREE_CODE (element) == UNION_TYPE)
3057 && (TREE_CODE (x) != TYPE_DECL
3058 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
3059 && !COMPLETE_TYPE_P (element))
3060 C_TYPE_INCOMPLETE_VARS (element)
3061 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
3066 /* Record X as belonging to file scope.
3067 This is used only internally by the Objective-C front end,
3068 and is limited to its needs. duplicate_decls is not called;
3069 if there is any preexisting decl for this identifier, it is an ICE. */
3072 pushdecl_top_level (tree x)
3075 bool nested = false;
3076 gcc_assert (VAR_P (x) || TREE_CODE (x) == CONST_DECL);
3078 name = DECL_NAME (x);
3080 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
3082 if (TREE_PUBLIC (x))
3084 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false,
3089 bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION);
3095 implicit_decl_warning (location_t loc, tree id, tree olddecl)
3097 if (warn_implicit_function_declaration)
3102 warned = pedwarn (loc, OPT_Wimplicit_function_declaration,
3103 "implicit declaration of function %qE", id);
3105 warned = warning_at (loc, OPT_Wimplicit_function_declaration,
3106 G_("implicit declaration of function %qE"), id);
3107 if (olddecl && warned)
3108 locate_old_decl (olddecl);
3112 /* This function represents mapping of a function code FCODE
3113 to its respective header. */
3116 header_for_builtin_fn (enum built_in_function fcode)
3120 CASE_FLT_FN (BUILT_IN_ACOS):
3121 CASE_FLT_FN (BUILT_IN_ACOSH):
3122 CASE_FLT_FN (BUILT_IN_ASIN):
3123 CASE_FLT_FN (BUILT_IN_ASINH):
3124 CASE_FLT_FN (BUILT_IN_ATAN):
3125 CASE_FLT_FN (BUILT_IN_ATANH):
3126 CASE_FLT_FN (BUILT_IN_ATAN2):
3127 CASE_FLT_FN (BUILT_IN_CBRT):
3128 CASE_FLT_FN (BUILT_IN_CEIL):
3129 CASE_FLT_FN (BUILT_IN_COPYSIGN):
3130 CASE_FLT_FN (BUILT_IN_COS):
3131 CASE_FLT_FN (BUILT_IN_COSH):
3132 CASE_FLT_FN (BUILT_IN_ERF):
3133 CASE_FLT_FN (BUILT_IN_ERFC):
3134 CASE_FLT_FN (BUILT_IN_EXP):
3135 CASE_FLT_FN (BUILT_IN_EXP2):
3136 CASE_FLT_FN (BUILT_IN_EXPM1):
3137 CASE_FLT_FN (BUILT_IN_FABS):
3138 CASE_FLT_FN (BUILT_IN_FDIM):
3139 CASE_FLT_FN (BUILT_IN_FLOOR):
3140 CASE_FLT_FN (BUILT_IN_FMA):
3141 CASE_FLT_FN (BUILT_IN_FMAX):
3142 CASE_FLT_FN (BUILT_IN_FMIN):
3143 CASE_FLT_FN (BUILT_IN_FMOD):
3144 CASE_FLT_FN (BUILT_IN_FREXP):
3145 CASE_FLT_FN (BUILT_IN_HYPOT):
3146 CASE_FLT_FN (BUILT_IN_ILOGB):
3147 CASE_FLT_FN (BUILT_IN_LDEXP):
3148 CASE_FLT_FN (BUILT_IN_LGAMMA):
3149 CASE_FLT_FN (BUILT_IN_LLRINT):
3150 CASE_FLT_FN (BUILT_IN_LLROUND):
3151 CASE_FLT_FN (BUILT_IN_LOG):
3152 CASE_FLT_FN (BUILT_IN_LOG10):
3153 CASE_FLT_FN (BUILT_IN_LOG1P):
3154 CASE_FLT_FN (BUILT_IN_LOG2):
3155 CASE_FLT_FN (BUILT_IN_LOGB):
3156 CASE_FLT_FN (BUILT_IN_LRINT):
3157 CASE_FLT_FN (BUILT_IN_LROUND):
3158 CASE_FLT_FN (BUILT_IN_MODF):
3159 CASE_FLT_FN (BUILT_IN_NAN):
3160 CASE_FLT_FN (BUILT_IN_NEARBYINT):
3161 CASE_FLT_FN (BUILT_IN_NEXTAFTER):
3162 CASE_FLT_FN (BUILT_IN_NEXTTOWARD):
3163 CASE_FLT_FN (BUILT_IN_POW):
3164 CASE_FLT_FN (BUILT_IN_REMAINDER):
3165 CASE_FLT_FN (BUILT_IN_REMQUO):
3166 CASE_FLT_FN (BUILT_IN_RINT):
3167 CASE_FLT_FN (BUILT_IN_ROUND):
3168 CASE_FLT_FN (BUILT_IN_SCALBLN):
3169 CASE_FLT_FN (BUILT_IN_SCALBN):
3170 CASE_FLT_FN (BUILT_IN_SIN):
3171 CASE_FLT_FN (BUILT_IN_SINH):
3172 CASE_FLT_FN (BUILT_IN_SINCOS):
3173 CASE_FLT_FN (BUILT_IN_SQRT):
3174 CASE_FLT_FN (BUILT_IN_TAN):
3175 CASE_FLT_FN (BUILT_IN_TANH):
3176 CASE_FLT_FN (BUILT_IN_TGAMMA):
3177 CASE_FLT_FN (BUILT_IN_TRUNC):
3178 case BUILT_IN_ISINF:
3179 case BUILT_IN_ISNAN:
3181 CASE_FLT_FN (BUILT_IN_CABS):
3182 CASE_FLT_FN (BUILT_IN_CACOS):
3183 CASE_FLT_FN (BUILT_IN_CACOSH):
3184 CASE_FLT_FN (BUILT_IN_CARG):
3185 CASE_FLT_FN (BUILT_IN_CASIN):
3186 CASE_FLT_FN (BUILT_IN_CASINH):
3187 CASE_FLT_FN (BUILT_IN_CATAN):
3188 CASE_FLT_FN (BUILT_IN_CATANH):
3189 CASE_FLT_FN (BUILT_IN_CCOS):
3190 CASE_FLT_FN (BUILT_IN_CCOSH):
3191 CASE_FLT_FN (BUILT_IN_CEXP):
3192 CASE_FLT_FN (BUILT_IN_CIMAG):
3193 CASE_FLT_FN (BUILT_IN_CLOG):
3194 CASE_FLT_FN (BUILT_IN_CONJ):
3195 CASE_FLT_FN (BUILT_IN_CPOW):
3196 CASE_FLT_FN (BUILT_IN_CPROJ):
3197 CASE_FLT_FN (BUILT_IN_CREAL):
3198 CASE_FLT_FN (BUILT_IN_CSIN):
3199 CASE_FLT_FN (BUILT_IN_CSINH):
3200 CASE_FLT_FN (BUILT_IN_CSQRT):
3201 CASE_FLT_FN (BUILT_IN_CTAN):
3202 CASE_FLT_FN (BUILT_IN_CTANH):
3203 return "<complex.h>";
3204 case BUILT_IN_MEMCHR:
3205 case BUILT_IN_MEMCMP:
3206 case BUILT_IN_MEMCPY:
3207 case BUILT_IN_MEMMOVE:
3208 case BUILT_IN_MEMSET:
3209 case BUILT_IN_STRCAT:
3210 case BUILT_IN_STRCHR:
3211 case BUILT_IN_STRCMP:
3212 case BUILT_IN_STRCPY:
3213 case BUILT_IN_STRCSPN:
3214 case BUILT_IN_STRLEN:
3215 case BUILT_IN_STRNCAT:
3216 case BUILT_IN_STRNCMP:
3217 case BUILT_IN_STRNCPY:
3218 case BUILT_IN_STRPBRK:
3219 case BUILT_IN_STRRCHR:
3220 case BUILT_IN_STRSPN:
3221 case BUILT_IN_STRSTR:
3222 return "<string.h>";
3223 case BUILT_IN_FPRINTF:
3225 case BUILT_IN_FPUTC:
3226 case BUILT_IN_FPUTS:
3227 case BUILT_IN_FSCANF:
3228 case BUILT_IN_FWRITE:
3229 case BUILT_IN_PRINTF:
3230 case BUILT_IN_PUTCHAR:
3232 case BUILT_IN_SCANF:
3233 case BUILT_IN_SNPRINTF:
3234 case BUILT_IN_SPRINTF:
3235 case BUILT_IN_SSCANF:
3236 case BUILT_IN_VFPRINTF:
3237 case BUILT_IN_VFSCANF:
3238 case BUILT_IN_VPRINTF:
3239 case BUILT_IN_VSCANF:
3240 case BUILT_IN_VSNPRINTF:
3241 case BUILT_IN_VSPRINTF:
3242 case BUILT_IN_VSSCANF:
3244 case BUILT_IN_ISALNUM:
3245 case BUILT_IN_ISALPHA:
3246 case BUILT_IN_ISBLANK:
3247 case BUILT_IN_ISCNTRL:
3248 case BUILT_IN_ISDIGIT:
3249 case BUILT_IN_ISGRAPH:
3250 case BUILT_IN_ISLOWER:
3251 case BUILT_IN_ISPRINT:
3252 case BUILT_IN_ISPUNCT:
3253 case BUILT_IN_ISSPACE:
3254 case BUILT_IN_ISUPPER:
3255 case BUILT_IN_ISXDIGIT:
3256 case BUILT_IN_TOLOWER:
3257 case BUILT_IN_TOUPPER:
3259 case BUILT_IN_ISWALNUM:
3260 case BUILT_IN_ISWALPHA:
3261 case BUILT_IN_ISWBLANK:
3262 case BUILT_IN_ISWCNTRL:
3263 case BUILT_IN_ISWDIGIT:
3264 case BUILT_IN_ISWGRAPH:
3265 case BUILT_IN_ISWLOWER:
3266 case BUILT_IN_ISWPRINT:
3267 case BUILT_IN_ISWPUNCT:
3268 case BUILT_IN_ISWSPACE:
3269 case BUILT_IN_ISWUPPER:
3270 case BUILT_IN_ISWXDIGIT:
3271 case BUILT_IN_TOWLOWER:
3272 case BUILT_IN_TOWUPPER:
3273 return "<wctype.h>";
3274 case BUILT_IN_ABORT:
3276 case BUILT_IN_CALLOC:
3280 case BUILT_IN_LLABS:
3281 case BUILT_IN_MALLOC:
3282 case BUILT_IN_REALLOC:
3283 case BUILT_IN__EXIT2:
3284 case BUILT_IN_ALIGNED_ALLOC:
3285 return "<stdlib.h>";
3286 case BUILT_IN_IMAXABS:
3287 return "<inttypes.h>";
3288 case BUILT_IN_STRFTIME:
3295 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
3296 function of type int (). */
3299 implicitly_declare (location_t loc, tree functionid)
3301 struct c_binding *b;
3305 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
3307 if (B_IN_SCOPE (b, external_scope))
3316 if (decl == error_mark_node)
3319 /* FIXME: Objective-C has weird not-really-builtin functions
3320 which are supposed to be visible automatically. They wind up
3321 in the external scope because they're pushed before the file
3322 scope gets created. Catch this here and rebind them into the
3324 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
3326 bind (functionid, decl, file_scope,
3327 /*invisible=*/false, /*nested=*/true,
3328 DECL_SOURCE_LOCATION (decl));
3333 tree newtype = default_function_type;
3335 TREE_TYPE (decl) = b->u.type;
3336 /* Implicit declaration of a function already declared
3337 (somehow) in a different scope, or as a built-in.
3338 If this is the first time this has happened, warn;
3339 then recycle the old declaration but with the new type. */
3340 if (!C_DECL_IMPLICIT (decl))
3342 implicit_decl_warning (loc, functionid, decl);
3343 C_DECL_IMPLICIT (decl) = 1;
3345 if (DECL_BUILT_IN (decl))
3347 newtype = build_type_attribute_variant (newtype,
3349 (TREE_TYPE (decl)));
3350 if (!comptypes (newtype, TREE_TYPE (decl)))
3352 bool warned = warning_at (loc, 0, "incompatible implicit "
3353 "declaration of built-in "
3354 "function %qD", decl);
3355 /* See if we can hint which header to include. */
3357 = header_for_builtin_fn (DECL_FUNCTION_CODE (decl));
3358 if (header != NULL && warned)
3359 inform (loc, "include %qs or provide a declaration of %qD",
3361 newtype = TREE_TYPE (decl);
3366 if (!comptypes (newtype, TREE_TYPE (decl)))
3368 error_at (loc, "incompatible implicit declaration of "
3369 "function %qD", decl);
3370 locate_old_decl (decl);
3373 b->u.type = TREE_TYPE (decl);
3374 TREE_TYPE (decl) = newtype;
3375 bind (functionid, decl, current_scope,
3376 /*invisible=*/false, /*nested=*/true,
3377 DECL_SOURCE_LOCATION (decl));
3382 /* Not seen before. */
3383 decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type);
3384 DECL_EXTERNAL (decl) = 1;
3385 TREE_PUBLIC (decl) = 1;
3386 C_DECL_IMPLICIT (decl) = 1;
3387 implicit_decl_warning (loc, functionid, 0);
3388 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
3390 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
3392 /* C89 says implicit declarations are in the innermost block.
3393 So we record the decl in the standard fashion. */
3394 decl = pushdecl (decl);
3396 /* No need to call objc_check_decl here - it's a function type. */
3397 rest_of_decl_compilation (decl, 0, 0);
3399 /* Write a record describing this implicit function declaration
3400 to the prototypes file (if requested). */
3401 gen_aux_info_record (decl, 0, 1, 0);
3403 /* Possibly apply some default attributes to this implicit declaration. */
3404 decl_attributes (&decl, NULL_TREE, 0);
3409 /* Issue an error message for a reference to an undeclared variable
3410 ID, including a reference to a builtin outside of function-call
3411 context. Establish a binding of the identifier to error_mark_node
3412 in an appropriate scope, which will suppress further errors for the
3413 same identifier. The error message should be given location LOC. */
3415 undeclared_variable (location_t loc, tree id)
3417 static bool already = false;
3418 struct c_scope *scope;
3420 if (current_function_decl == 0)
3422 error_at (loc, "%qE undeclared here (not in a function)", id);
3423 scope = current_scope;
3427 if (!objc_diagnose_private_ivar (id))
3428 error_at (loc, "%qE undeclared (first use in this function)", id);
3431 inform (loc, "each undeclared identifier is reported only"
3432 " once for each function it appears in");
3436 /* If we are parsing old-style parameter decls, current_function_decl
3437 will be nonnull but current_function_scope will be null. */
3438 scope = current_function_scope ? current_function_scope : current_scope;
3440 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
3444 /* Subroutine of lookup_label, declare_label, define_label: construct a
3445 LABEL_DECL with all the proper frills. Also create a struct
3446 c_label_vars initialized for the current scope. */
3449 make_label (location_t location, tree name, bool defining,
3450 struct c_label_vars **p_label_vars)
3452 tree label = build_decl (location, LABEL_DECL, name, void_type_node);
3453 DECL_CONTEXT (label) = current_function_decl;
3454 DECL_MODE (label) = VOIDmode;
3456 c_label_vars *label_vars = ggc_alloc<c_label_vars> ();
3457 label_vars->shadowed = NULL;
3458 set_spot_bindings (&label_vars->label_bindings, defining);
3459 label_vars->decls_in_scope = make_tree_vector ();
3460 label_vars->gotos = NULL;
3461 *p_label_vars = label_vars;
3466 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3467 Create one if none exists so far for the current function.
3468 This is called when a label is used in a goto expression or
3469 has its address taken. */
3472 lookup_label (tree name)
3475 struct c_label_vars *label_vars;
3477 if (current_function_scope == 0)
3479 error ("label %qE referenced outside of any function", name);
3483 /* Use a label already defined or ref'd with this name, but not if
3484 it is inherited from a containing function and wasn't declared
3486 label = I_LABEL_DECL (name);
3487 if (label && (DECL_CONTEXT (label) == current_function_decl
3488 || C_DECLARED_LABEL_FLAG (label)))
3490 /* If the label has only been declared, update its apparent
3491 location to point here, for better diagnostics if it
3492 turns out not to have been defined. */
3493 if (DECL_INITIAL (label) == NULL_TREE)
3494 DECL_SOURCE_LOCATION (label) = input_location;
3498 /* No label binding for that identifier; make one. */
3499 label = make_label (input_location, name, false, &label_vars);
3501 /* Ordinary labels go in the current function scope. */
3502 bind_label (name, label, current_function_scope, label_vars);
3507 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3511 warn_about_goto (location_t goto_loc, tree label, tree decl)
3513 if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3515 "jump into scope of identifier with variably modified type");
3517 warning_at (goto_loc, OPT_Wjump_misses_init,
3518 "jump skips variable initialization");
3519 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3520 inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl);
3523 /* Look up a label because of a goto statement. This is like
3524 lookup_label, but also issues any appropriate warnings. */
3527 lookup_label_for_goto (location_t loc, tree name)
3530 struct c_label_vars *label_vars;
3534 label = lookup_label (name);
3535 if (label == NULL_TREE)
3538 /* If we are jumping to a different function, we can't issue any
3540 if (DECL_CONTEXT (label) != current_function_decl)
3542 gcc_assert (C_DECLARED_LABEL_FLAG (label));
3546 label_vars = I_LABEL_BINDING (name)->u.label;
3548 /* If the label has not yet been defined, then push this goto on a
3549 list for possible later warnings. */
3550 if (label_vars->label_bindings.scope == NULL)
3552 c_goto_bindings *g = ggc_alloc<c_goto_bindings> ();
3555 set_spot_bindings (&g->goto_bindings, true);
3556 vec_safe_push (label_vars->gotos, g);
3560 /* If there are any decls in label_vars->decls_in_scope, then this
3561 goto has missed the declaration of the decl. This happens for a
3567 Issue a warning or error. */
3568 FOR_EACH_VEC_SAFE_ELT (label_vars->decls_in_scope, ix, decl)
3569 warn_about_goto (loc, label, decl);
3571 if (label_vars->label_bindings.left_stmt_expr)
3573 error_at (loc, "jump into statement expression");
3574 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3580 /* Make a label named NAME in the current function, shadowing silently
3581 any that may be inherited from containing functions or containing
3582 scopes. This is called for __label__ declarations. */
3585 declare_label (tree name)
3587 struct c_binding *b = I_LABEL_BINDING (name);
3589 struct c_label_vars *label_vars;
3591 /* Check to make sure that the label hasn't already been declared
3593 if (b && B_IN_CURRENT_SCOPE (b))
3595 error ("duplicate label declaration %qE", name);
3596 locate_old_decl (b->decl);
3598 /* Just use the previous declaration. */
3602 label = make_label (input_location, name, false, &label_vars);
3603 C_DECLARED_LABEL_FLAG (label) = 1;
3605 /* Declared labels go in the current scope. */
3606 bind_label (name, label, current_scope, label_vars);
3611 /* When we define a label, issue any appropriate warnings if there are
3612 any gotos earlier in the function which jump to this label. */
3615 check_earlier_gotos (tree label, struct c_label_vars* label_vars)
3618 struct c_goto_bindings *g;
3620 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
3622 struct c_binding *b;
3623 struct c_scope *scope;
3625 /* We have a goto to this label. The goto is going forward. In
3626 g->scope, the goto is going to skip any binding which was
3627 defined after g->bindings_in_scope. */
3628 if (g->goto_bindings.scope->has_jump_unsafe_decl)
3630 for (b = g->goto_bindings.scope->bindings;
3631 b != g->goto_bindings.bindings_in_scope;
3634 if (decl_jump_unsafe (b->decl))
3635 warn_about_goto (g->loc, label, b->decl);
3639 /* We also need to warn about decls defined in any scopes
3640 between the scope of the label and the scope of the goto. */
3641 for (scope = label_vars->label_bindings.scope;
3642 scope != g->goto_bindings.scope;
3643 scope = scope->outer)
3645 gcc_assert (scope != NULL);
3646 if (scope->has_jump_unsafe_decl)
3648 if (scope == label_vars->label_bindings.scope)
3649 b = label_vars->label_bindings.bindings_in_scope;
3651 b = scope->bindings;
3652 for (; b != NULL; b = b->prev)
3654 if (decl_jump_unsafe (b->decl))
3655 warn_about_goto (g->loc, label, b->decl);
3660 if (g->goto_bindings.stmt_exprs > 0)
3662 error_at (g->loc, "jump into statement expression");
3663 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here",
3668 /* Now that the label is defined, we will issue warnings about
3669 subsequent gotos to this label when we see them. */
3670 vec_safe_truncate (label_vars->gotos, 0);
3671 label_vars->gotos = NULL;
3674 /* Define a label, specifying the location in the source file.
3675 Return the LABEL_DECL node for the label, if the definition is valid.
3676 Otherwise return 0. */
3679 define_label (location_t location, tree name)
3681 /* Find any preexisting label with this name. It is an error
3682 if that label has already been defined in this function, or
3683 if there is a containing function with a declared label with
3685 tree label = I_LABEL_DECL (name);
3688 && ((DECL_CONTEXT (label) == current_function_decl
3689 && DECL_INITIAL (label) != 0)
3690 || (DECL_CONTEXT (label) != current_function_decl
3691 && C_DECLARED_LABEL_FLAG (label))))
3693 error_at (location, "duplicate label %qD", label);
3694 locate_old_decl (label);
3697 else if (label && DECL_CONTEXT (label) == current_function_decl)
3699 struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label;
3701 /* The label has been used or declared already in this function,
3702 but not defined. Update its location to point to this
3704 DECL_SOURCE_LOCATION (label) = location;
3705 set_spot_bindings (&label_vars->label_bindings, true);
3707 /* Issue warnings as required about any goto statements from
3708 earlier in the function. */
3709 check_earlier_gotos (label, label_vars);
3713 struct c_label_vars *label_vars;
3715 /* No label binding for that identifier; make one. */
3716 label = make_label (location, name, true, &label_vars);
3718 /* Ordinary labels go in the current function scope. */
3719 bind_label (name, label, current_function_scope, label_vars);
3722 if (!in_system_header_at (input_location) && lookup_name (name))
3723 warning_at (location, OPT_Wtraditional,
3724 "traditional C lacks a separate namespace "
3725 "for labels, identifier %qE conflicts", name);
3727 /* Mark label as having been defined. */
3728 DECL_INITIAL (label) = error_mark_node;
3732 /* Get the bindings for a new switch statement. This is used to issue
3733 warnings as appropriate for jumps from the switch to case or
3736 struct c_spot_bindings *
3737 c_get_switch_bindings (void)
3739 struct c_spot_bindings *switch_bindings;
3741 switch_bindings = XNEW (struct c_spot_bindings);
3742 set_spot_bindings (switch_bindings, true);
3743 return switch_bindings;
3747 c_release_switch_bindings (struct c_spot_bindings *bindings)
3749 gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr);
3753 /* This is called at the point of a case or default label to issue
3754 warnings about decls as needed. It returns true if it found an
3755 error, not just a warning. */
3758 c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings,
3759 location_t switch_loc, location_t case_loc)
3762 struct c_scope *scope;
3765 for (scope = current_scope;
3766 scope != switch_bindings->scope;
3767 scope = scope->outer)
3769 struct c_binding *b;
3771 gcc_assert (scope != NULL);
3773 if (!scope->has_jump_unsafe_decl)
3776 for (b = scope->bindings; b != NULL; b = b->prev)
3778 if (decl_jump_unsafe (b->decl))
3780 if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE))
3784 ("switch jumps into scope of identifier with "
3785 "variably modified type"));
3788 warning_at (case_loc, OPT_Wjump_misses_init,
3789 "switch jumps over variable initialization");
3790 inform (switch_loc, "switch starts here");
3791 inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here",
3797 if (switch_bindings->stmt_exprs > 0)
3800 error_at (case_loc, "switch jumps into statement expression");
3801 inform (switch_loc, "switch starts here");
3807 /* Given NAME, an IDENTIFIER_NODE,
3808 return the structure (or union or enum) definition for that name.
3809 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3810 CODE says which kind of type the caller wants;
3811 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3812 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3813 location where the tag was defined.
3814 If the wrong kind of type is found, an error is reported. */
3817 lookup_tag (enum tree_code code, tree name, int thislevel_only,
3820 struct c_binding *b = I_TAG_BINDING (name);
3826 /* We only care about whether it's in this level if
3827 thislevel_only was set or it might be a type clash. */
3828 if (thislevel_only || TREE_CODE (b->decl) != code)
3830 /* For our purposes, a tag in the external scope is the same as
3831 a tag in the file scope. (Primarily relevant to Objective-C
3832 and its builtin structure tags, which get pushed before the
3833 file scope is created.) */
3834 if (B_IN_CURRENT_SCOPE (b)
3835 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
3839 if (thislevel_only && !thislevel)
3842 if (TREE_CODE (b->decl) != code)
3844 /* Definition isn't the kind we were looking for. */
3845 pending_invalid_xref = name;
3846 pending_invalid_xref_location = input_location;
3848 /* If in the same binding level as a declaration as a tag
3849 of a different type, this must not be allowed to
3850 shadow that tag, so give the error immediately.
3851 (For example, "struct foo; union foo;" is invalid.) */
3853 pending_xref_error ();
3862 /* Print an error message now
3863 for a recent invalid struct, union or enum cross reference.
3864 We don't print them immediately because they are not invalid
3865 when used in the `struct foo;' construct for shadowing. */
3868 pending_xref_error (void)
3870 if (pending_invalid_xref != 0)
3871 error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag",
3872 pending_invalid_xref);
3873 pending_invalid_xref = 0;
3877 /* Look up NAME in the current scope and its superiors
3878 in the namespace of variables, functions and typedefs.
3879 Return a ..._DECL node of some kind representing its definition,
3880 or return 0 if it is undefined. */
3883 lookup_name (tree name)
3885 struct c_binding *b = I_SYMBOL_BINDING (name);
3886 if (b && !b->invisible)
3888 maybe_record_typedef_use (b->decl);
3894 /* Similar to `lookup_name' but look only at the indicated scope. */
3897 lookup_name_in_scope (tree name, struct c_scope *scope)
3899 struct c_binding *b;
3901 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
3902 if (B_IN_SCOPE (b, scope))
3907 /* Create the predefined scalar types of C,
3908 and some nodes representing standard constants (0, 1, (void *) 0).
3909 Initialize the global scope.
3910 Make definitions for built-in primitive functions. */
3913 c_init_decl_processing (void)
3915 location_t save_loc = input_location;
3917 /* Initialize reserved words for parser. */
3920 current_function_decl = 0;
3922 gcc_obstack_init (&parser_obstack);
3924 /* Make the externals scope. */
3926 external_scope = current_scope;
3928 /* Declarations from c_common_nodes_and_builtins must not be associated
3929 with this input file, lest we get differences between using and not
3930 using preprocessed headers. */
3931 input_location = BUILTINS_LOCATION;
3933 c_common_nodes_and_builtins ();
3935 /* In C, comparisons and TRUTH_* expressions have type int. */
3936 truthvalue_type_node = integer_type_node;
3937 truthvalue_true_node = integer_one_node;
3938 truthvalue_false_node = integer_zero_node;
3940 /* Even in C99, which has a real boolean type. */
3941 pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"),
3942 boolean_type_node));
3944 input_location = save_loc;
3946 make_fname_decl = c_make_fname_decl;
3947 start_fname_decls ();
3950 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3951 give the decl, NAME is the initialization string and TYPE_DEP
3952 indicates whether NAME depended on the type of the function. As we
3953 don't yet implement delayed emission of static data, we mark the
3954 decl as emitted so it is not placed in the output. Anything using
3955 it must therefore pull out the STRING_CST initializer directly.
3959 c_make_fname_decl (location_t loc, tree id, int type_dep)
3961 const char *name = fname_as_string (type_dep);
3962 tree decl, type, init;
3963 size_t length = strlen (name);
3965 type = build_array_type (char_type_node,
3966 build_index_type (size_int (length)));
3967 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
3969 decl = build_decl (loc, VAR_DECL, id, type);
3971 TREE_STATIC (decl) = 1;
3972 TREE_READONLY (decl) = 1;
3973 DECL_ARTIFICIAL (decl) = 1;
3975 init = build_string (length + 1, name);
3976 free (CONST_CAST (char *, name));
3977 TREE_TYPE (init) = type;
3978 DECL_INITIAL (decl) = init;
3980 TREE_USED (decl) = 1;
3982 if (current_function_decl
3983 /* For invalid programs like this:
3986 const char* p = __FUNCTION__;
3988 the __FUNCTION__ is believed to appear in K&R style function
3989 parameter declarator. In that case we still don't have
3991 && (!seen_error () || current_function_scope))
3993 DECL_CONTEXT (decl) = current_function_decl;
3994 bind (id, decl, current_function_scope,
3995 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
3998 finish_decl (decl, loc, init, NULL_TREE, NULL_TREE);
4004 c_builtin_function (tree decl)
4006 tree type = TREE_TYPE (decl);
4007 tree id = DECL_NAME (decl);
4009 const char *name = IDENTIFIER_POINTER (id);
4010 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
4012 /* Should never be called on a symbol with a preexisting meaning. */
4013 gcc_assert (!I_SYMBOL_BINDING (id));
4015 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false,
4018 /* Builtins in the implementation namespace are made visible without
4019 needing to be explicitly declared. See push_file_scope. */
4020 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
4022 DECL_CHAIN (decl) = visible_builtins;
4023 visible_builtins = decl;
4030 c_builtin_function_ext_scope (tree decl)
4032 tree type = TREE_TYPE (decl);
4033 tree id = DECL_NAME (decl);
4035 const char *name = IDENTIFIER_POINTER (id);
4036 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
4039 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false,
4042 /* Builtins in the implementation namespace are made visible without
4043 needing to be explicitly declared. See push_file_scope. */
4044 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
4046 DECL_CHAIN (decl) = visible_builtins;
4047 visible_builtins = decl;
4053 /* Called when a declaration is seen that contains no names to declare.
4054 If its type is a reference to a structure, union or enum inherited
4055 from a containing scope, shadow that tag name for the current scope
4056 with a forward reference.
4057 If its type defines a new named structure or union
4058 or defines an enum, it is valid but we need not do anything here.
4059 Otherwise, it is an error. */
4062 shadow_tag (const struct c_declspecs *declspecs)
4064 shadow_tag_warned (declspecs, 0);
4067 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
4070 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
4072 bool found_tag = false;
4074 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
4076 tree value = declspecs->type;
4077 enum tree_code code = TREE_CODE (value);
4079 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
4080 /* Used to test also that TYPE_SIZE (value) != 0.
4081 That caused warning for `struct foo;' at top level in the file. */
4083 tree name = TYPE_NAME (value);
4088 if (declspecs->restrict_p)
4090 error ("invalid use of %<restrict%>");
4096 if (warned != 1 && code != ENUMERAL_TYPE)
4097 /* Empty unnamed enum OK */
4099 pedwarn (input_location, 0,
4100 "unnamed struct/union that defines no instances");
4104 else if (declspecs->typespec_kind != ctsk_tagdef
4105 && declspecs->typespec_kind != ctsk_tagfirstref
4106 && declspecs->storage_class != csc_none)
4109 pedwarn (input_location, 0,
4110 "empty declaration with storage class specifier "
4111 "does not redeclare tag");
4113 pending_xref_error ();
4115 else if (declspecs->typespec_kind != ctsk_tagdef
4116 && declspecs->typespec_kind != ctsk_tagfirstref
4117 && (declspecs->const_p
4118 || declspecs->volatile_p
4119 || declspecs->atomic_p
4120 || declspecs->restrict_p
4121 || declspecs->address_space))
4124 pedwarn (input_location, 0,
4125 "empty declaration with type qualifier "
4126 "does not redeclare tag");
4128 pending_xref_error ();
4130 else if (declspecs->typespec_kind != ctsk_tagdef
4131 && declspecs->typespec_kind != ctsk_tagfirstref
4132 && declspecs->alignas_p)
4135 pedwarn (input_location, 0,
4136 "empty declaration with %<_Alignas%> "
4137 "does not redeclare tag");
4139 pending_xref_error ();
4143 pending_invalid_xref = 0;
4144 t = lookup_tag (code, name, 1, NULL);
4148 t = make_node (code);
4149 pushtag (input_location, name, t);
4155 if (warned != 1 && !in_system_header_at (input_location))
4157 pedwarn (input_location, 0,
4158 "useless type name in empty declaration");
4163 else if (warned != 1 && !in_system_header_at (input_location)
4164 && declspecs->typedef_p)
4166 pedwarn (input_location, 0, "useless type name in empty declaration");
4170 pending_invalid_xref = 0;
4172 if (declspecs->inline_p)
4174 error ("%<inline%> in empty declaration");
4178 if (declspecs->noreturn_p)
4180 error ("%<_Noreturn%> in empty declaration");
4184 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
4186 error ("%<auto%> in file-scope empty declaration");
4190 if (current_scope == file_scope && declspecs->storage_class == csc_register)
4192 error ("%<register%> in file-scope empty declaration");
4196 if (!warned && !in_system_header_at (input_location)
4197 && declspecs->storage_class != csc_none)
4199 warning (0, "useless storage class specifier in empty declaration");
4203 if (!warned && !in_system_header_at (input_location) && declspecs->thread_p)
4205 warning (0, "useless %qs in empty declaration",
4206 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
4211 && !in_system_header_at (input_location)
4212 && (declspecs->const_p
4213 || declspecs->volatile_p
4214 || declspecs->atomic_p
4215 || declspecs->restrict_p
4216 || declspecs->address_space))
4218 warning (0, "useless type qualifier in empty declaration");
4222 if (!warned && !in_system_header_at (input_location)
4223 && declspecs->alignas_p)
4225 warning (0, "useless %<_Alignas%> in empty declaration");
4232 pedwarn (input_location, 0, "empty declaration");
4237 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
4238 bits. SPECS represents declaration specifiers that the grammar
4239 only permits to contain type qualifiers and attributes. */
4242 quals_from_declspecs (const struct c_declspecs *specs)
4244 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
4245 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
4246 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0)
4247 | (specs->atomic_p ? TYPE_QUAL_ATOMIC : 0)
4248 | (ENCODE_QUAL_ADDR_SPACE (specs->address_space)));
4249 gcc_assert (!specs->type
4250 && !specs->decl_attr
4251 && specs->typespec_word == cts_none
4252 && specs->storage_class == csc_none
4253 && !specs->typedef_p
4254 && !specs->explicit_signed_p
4255 && !specs->deprecated_p
4257 && !specs->long_long_p
4260 && !specs->unsigned_p
4261 && !specs->complex_p
4263 && !specs->noreturn_p
4264 && !specs->thread_p);
4268 /* Construct an array declarator. LOC is the location of the
4269 beginning of the array (usually the opening brace). EXPR is the
4270 expression inside [], or NULL_TREE. QUALS are the type qualifiers
4271 inside the [] (to be applied to the pointer to which a parameter
4272 array is converted). STATIC_P is true if "static" is inside the
4273 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
4274 VLA of unspecified length which is nevertheless a complete type,
4275 false otherwise. The field for the contained declarator is left to
4276 be filled in by set_array_declarator_inner. */
4278 struct c_declarator *
4279 build_array_declarator (location_t loc,
4280 tree expr, struct c_declspecs *quals, bool static_p,
4283 struct c_declarator *declarator = XOBNEW (&parser_obstack,
4284 struct c_declarator);
4285 declarator->id_loc = loc;
4286 declarator->kind = cdk_array;
4287 declarator->declarator = 0;
4288 declarator->u.array.dimen = expr;
4291 declarator->u.array.attrs = quals->attrs;
4292 declarator->u.array.quals = quals_from_declspecs (quals);
4296 declarator->u.array.attrs = NULL_TREE;
4297 declarator->u.array.quals = 0;
4299 declarator->u.array.static_p = static_p;
4300 declarator->u.array.vla_unspec_p = vla_unspec_p;
4301 if (static_p || quals != NULL)
4302 pedwarn_c90 (loc, OPT_Wpedantic,
4303 "ISO C90 does not support %<static%> or type "
4304 "qualifiers in parameter array declarators");
4306 pedwarn_c90 (loc, OPT_Wpedantic,
4307 "ISO C90 does not support %<[*]%> array declarators");
4310 if (!current_scope->parm_flag)
4313 error_at (loc, "%<[*]%> not allowed in other than "
4314 "function prototype scope");
4315 declarator->u.array.vla_unspec_p = false;
4318 current_scope->had_vla_unspec = true;
4323 /* Set the contained declarator of an array declarator. DECL is the
4324 declarator, as constructed by build_array_declarator; INNER is what
4325 appears on the left of the []. */
4327 struct c_declarator *
4328 set_array_declarator_inner (struct c_declarator *decl,
4329 struct c_declarator *inner)
4331 decl->declarator = inner;
4335 /* INIT is a constructor that forms DECL's initializer. If the final
4336 element initializes a flexible array field, add the size of that
4337 initializer to DECL's size. */
4340 add_flexible_array_elts_to_size (tree decl, tree init)
4344 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init)))
4347 elt = CONSTRUCTOR_ELTS (init)->last ().value;
4348 type = TREE_TYPE (elt);
4349 if (TREE_CODE (type) == ARRAY_TYPE
4350 && TYPE_SIZE (type) == NULL_TREE
4351 && TYPE_DOMAIN (type) != NULL_TREE
4352 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
4354 complete_array_type (&type, elt, false);
4356 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
4357 DECL_SIZE_UNIT (decl)
4358 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
4362 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4363 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4364 before the type name, and set *EXPR_CONST_OPERANDS, if
4365 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4366 appear in a constant expression. */
4369 groktypename (struct c_type_name *type_name, tree *expr,
4370 bool *expr_const_operands)
4373 tree attrs = type_name->specs->attrs;
4375 type_name->specs->attrs = NULL_TREE;
4377 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
4378 false, NULL, &attrs, expr, expr_const_operands,
4381 /* Apply attributes. */
4382 decl_attributes (&type, attrs, 0);
4387 /* Wrapper for decl_attributes that adds some implicit attributes
4388 to VAR_DECLs or FUNCTION_DECLs. */
4391 c_decl_attributes (tree *node, tree attributes, int flags)
4393 /* Add implicit "omp declare target" attribute if requested. */
4394 if (current_omp_declare_target_attribute
4395 && ((VAR_P (*node) && is_global_var (*node))
4396 || TREE_CODE (*node) == FUNCTION_DECL))
4399 && ((DECL_CONTEXT (*node)
4400 && TREE_CODE (DECL_CONTEXT (*node)) == FUNCTION_DECL)
4401 || (current_function_decl && !DECL_EXTERNAL (*node))))
4402 error ("%q+D in block scope inside of declare target directive",
4404 else if (VAR_P (*node)
4405 && !lang_hooks.types.omp_mappable_type (TREE_TYPE (*node)))
4406 error ("%q+D in declare target directive does not have mappable type",
4409 attributes = tree_cons (get_identifier ("omp declare target"),
4410 NULL_TREE, attributes);
4412 return decl_attributes (node, attributes, flags);
4416 /* Decode a declarator in an ordinary declaration or data definition.
4417 This is called as soon as the type information and variable name
4418 have been parsed, before parsing the initializer if any.
4419 Here we create the ..._DECL node, fill in its type,
4420 and put it on the list of decls for the current context.
4421 The ..._DECL node is returned as the value.
4423 Exception: for arrays where the length is not specified,
4424 the type is left null, to be filled in by `finish_decl'.
4426 Function definitions do not come here; they go to start_function
4427 instead. However, external and forward declarations of functions
4428 do go through here. Structure field declarations are done by
4429 grokfield and not through here. */
4432 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
4433 bool initialized, tree attributes)
4437 tree expr = NULL_TREE;
4438 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
4440 /* An object declared as __attribute__((deprecated)) suppresses
4441 warnings of uses of other deprecated items. */
4442 if (lookup_attribute ("deprecated", attributes))
4443 deprecated_state = DEPRECATED_SUPPRESS;
4445 decl = grokdeclarator (declarator, declspecs,
4446 NORMAL, initialized, NULL, &attributes, &expr, NULL,
4448 if (!decl || decl == error_mark_node)
4452 add_stmt (fold_convert (void_type_node, expr));
4454 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
4455 warning (OPT_Wmain, "%q+D is usually a function", decl);
4458 /* Is it valid for this decl to have an initializer at all?
4459 If not, set INITIALIZED to zero, which will indirectly
4460 tell 'finish_decl' to ignore the initializer once it is parsed. */
4461 switch (TREE_CODE (decl))
4464 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
4469 error ("function %qD is initialized like a variable", decl);
4474 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4475 error ("parameter %qD is initialized", decl);
4480 /* Don't allow initializations for incomplete types except for
4481 arrays which might be completed by the initialization. */
4483 /* This can happen if the array size is an undefined macro.
4484 We already gave a warning, so we don't need another one. */
4485 if (TREE_TYPE (decl) == error_mark_node)
4487 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
4489 /* A complete type is ok if size is fixed. */
4491 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
4492 || C_DECL_VARIABLE_SIZE (decl))
4494 error ("variable-sized object may not be initialized");
4498 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
4500 error ("variable %qD has initializer but incomplete type", decl);
4503 else if (C_DECL_VARIABLE_SIZE (decl))
4505 /* Although C99 is unclear about whether incomplete arrays
4506 of VLAs themselves count as VLAs, it does not make
4507 sense to permit them to be initialized given that
4508 ordinary VLAs may not be initialized. */
4509 error ("variable-sized object may not be initialized");
4516 if (current_scope == file_scope)
4517 TREE_STATIC (decl) = 1;
4519 /* Tell 'pushdecl' this is an initialized decl
4520 even though we don't yet have the initializer expression.
4521 Also tell 'finish_decl' it may store the real initializer. */
4522 DECL_INITIAL (decl) = error_mark_node;
4525 /* If this is a function declaration, write a record describing it to the
4526 prototypes file (if requested). */
4528 if (TREE_CODE (decl) == FUNCTION_DECL)
4529 gen_aux_info_record (decl, 0, 0, prototype_p (TREE_TYPE (decl)));
4531 /* ANSI specifies that a tentative definition which is not merged with
4532 a non-tentative definition behaves exactly like a definition with an
4533 initializer equal to zero. (Section 3.7.2)
4535 -fno-common gives strict ANSI behavior, though this tends to break
4536 a large body of code that grew up without this rule.
4538 Thread-local variables are never common, since there's no entrenched
4539 body of code to break, and it allows more efficient variable references
4540 in the presence of dynamic linking. */
4544 && TREE_PUBLIC (decl)
4545 && !DECL_THREAD_LOCAL_P (decl)
4547 DECL_COMMON (decl) = 1;
4549 /* Set attributes here so if duplicate decl, will have proper attributes. */
4550 c_decl_attributes (&decl, attributes, 0);
4552 /* Handle gnu_inline attribute. */
4553 if (declspecs->inline_p
4554 && !flag_gnu89_inline
4555 && TREE_CODE (decl) == FUNCTION_DECL
4556 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
4557 || current_function_decl))
4559 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
4561 else if (declspecs->storage_class != csc_static)
4562 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
4565 if (TREE_CODE (decl) == FUNCTION_DECL
4566 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
4568 struct c_declarator *ce = declarator;
4570 if (ce->kind == cdk_pointer)
4571 ce = declarator->declarator;
4572 if (ce->kind == cdk_function)
4574 tree args = ce->u.arg_info->parms;
4575 for (; args; args = DECL_CHAIN (args))
4577 tree type = TREE_TYPE (args);
4578 if (type && INTEGRAL_TYPE_P (type)
4579 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4580 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
4585 if (TREE_CODE (decl) == FUNCTION_DECL
4586 && DECL_DECLARED_INLINE_P (decl)
4587 && DECL_UNINLINABLE (decl)
4588 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4589 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
4592 /* C99 6.7.4p3: An inline definition of a function with external
4593 linkage shall not contain a definition of a modifiable object
4594 with static storage duration... */
4596 && current_scope != file_scope
4597 && TREE_STATIC (decl)
4598 && !TREE_READONLY (decl)
4599 && DECL_DECLARED_INLINE_P (current_function_decl)
4600 && DECL_EXTERNAL (current_function_decl))
4601 record_inline_static (input_location, current_function_decl,
4602 decl, csi_modifiable);
4604 if (c_dialect_objc ()
4605 && VAR_OR_FUNCTION_DECL_P (decl))
4606 objc_check_global_decl (decl);
4608 /* Add this decl to the current scope.
4609 TEM may equal DECL or it may be a previous decl of the same name. */
4610 tem = pushdecl (decl);
4612 if (initialized && DECL_EXTERNAL (tem))
4614 DECL_EXTERNAL (tem) = 0;
4615 TREE_STATIC (tem) = 1;
4621 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4622 DECL or the non-array element type if DECL is an uninitialized array.
4623 If that type has a const member, diagnose this. */
4626 diagnose_uninitialized_cst_member (tree decl, tree type)
4629 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
4632 if (TREE_CODE (field) != FIELD_DECL)
4634 field_type = strip_array_types (TREE_TYPE (field));
4636 if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST)
4638 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4639 "uninitialized const member in %qT is invalid in C++",
4640 strip_array_types (TREE_TYPE (decl)));
4641 inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field);
4644 if (TREE_CODE (field_type) == RECORD_TYPE
4645 || TREE_CODE (field_type) == UNION_TYPE)
4646 diagnose_uninitialized_cst_member (decl, field_type);
4650 /* Finish processing of a declaration;
4651 install its initial value.
4652 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4653 If the length of an array type is not known before,
4654 it must be determined now, from the initial value, or it is an error.
4656 INIT_LOC is the location of the initial value. */
4659 finish_decl (tree decl, location_t init_loc, tree init,
4660 tree origtype, tree asmspec_tree)
4663 bool was_incomplete = (DECL_SIZE (decl) == 0);
4664 const char *asmspec = 0;
4666 /* If a name was specified, get the string. */
4667 if (VAR_OR_FUNCTION_DECL_P (decl)
4668 && DECL_FILE_SCOPE_P (decl))
4669 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4671 asmspec = TREE_STRING_POINTER (asmspec_tree);
4674 && TREE_STATIC (decl)
4675 && global_bindings_p ())
4676 /* So decl is a global variable. Record the types it uses
4677 so that we can decide later to emit debug info for them. */
4678 record_types_used_by_current_var_decl (decl);
4680 /* If `start_decl' didn't like having an initialization, ignore it now. */
4681 if (init != 0 && DECL_INITIAL (decl) == 0)
4684 /* Don't crash if parm is initialized. */
4685 if (TREE_CODE (decl) == PARM_DECL)
4689 store_init_value (init_loc, decl, init, origtype);
4691 if (c_dialect_objc () && (VAR_OR_FUNCTION_DECL_P (decl)
4692 || TREE_CODE (decl) == FIELD_DECL))
4693 objc_check_decl (decl);
4695 type = TREE_TYPE (decl);
4697 /* Deduce size of array from initialization, if not already known. */
4698 if (TREE_CODE (type) == ARRAY_TYPE
4699 && TYPE_DOMAIN (type) == 0
4700 && TREE_CODE (decl) != TYPE_DECL)
4703 = (TREE_STATIC (decl)
4704 /* Even if pedantic, an external linkage array
4705 may have incomplete type at first. */
4706 ? pedantic && !TREE_PUBLIC (decl)
4707 : !DECL_EXTERNAL (decl));
4709 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
4712 /* Get the completed type made by complete_array_type. */
4713 type = TREE_TYPE (decl);
4718 error ("initializer fails to determine size of %q+D", decl);
4723 error ("array size missing in %q+D", decl);
4724 /* If a `static' var's size isn't known,
4725 make it extern as well as static, so it does not get
4727 If it is not `static', then do not mark extern;
4728 finish_incomplete_decl will give it a default size
4729 and it will get allocated. */
4730 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4731 DECL_EXTERNAL (decl) = 1;
4735 error ("zero or negative size array %q+D", decl);
4739 /* For global variables, update the copy of the type that
4740 exists in the binding. */
4741 if (TREE_PUBLIC (decl))
4743 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
4744 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
4745 b_ext = b_ext->shadowed;
4748 if (b_ext->u.type && comptypes (b_ext->u.type, type))
4749 b_ext->u.type = composite_type (b_ext->u.type, type);
4751 b_ext->u.type = type;
4760 if (DECL_INITIAL (decl))
4761 TREE_TYPE (DECL_INITIAL (decl)) = type;
4763 relayout_decl (decl);
4768 if (init && TREE_CODE (init) == CONSTRUCTOR)
4769 add_flexible_array_elts_to_size (decl, init);
4771 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
4772 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
4773 layout_decl (decl, 0);
4775 if (DECL_SIZE (decl) == 0
4776 /* Don't give an error if we already gave one earlier. */
4777 && TREE_TYPE (decl) != error_mark_node
4778 && (TREE_STATIC (decl)
4779 /* A static variable with an incomplete type
4780 is an error if it is initialized.
4781 Also if it is not file scope.
4782 Otherwise, let it through, but if it is not `extern'
4783 then it may cause an error message later. */
4784 ? (DECL_INITIAL (decl) != 0
4785 || !DECL_FILE_SCOPE_P (decl))
4786 /* An automatic variable with an incomplete type
4788 : !DECL_EXTERNAL (decl)))
4790 error ("storage size of %q+D isn%'t known", decl);
4791 TREE_TYPE (decl) = error_mark_node;
4794 if (is_global_var (decl) && DECL_SIZE (decl) != 0)
4796 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4797 constant_expression_warning (DECL_SIZE (decl));
4800 error ("storage size of %q+D isn%'t constant", decl);
4801 TREE_TYPE (decl) = error_mark_node;
4805 if (TREE_USED (type))
4807 TREE_USED (decl) = 1;
4808 DECL_READ_P (decl) = 1;
4812 /* If this is a function and an assembler name is specified, reset DECL_RTL
4813 so we can give it its new name. Also, update builtin_decl if it
4814 was a normal built-in. */
4815 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4817 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4818 set_builtin_user_assembler_name (decl, asmspec);
4819 set_user_assembler_name (decl, asmspec);
4822 /* If #pragma weak was used, mark the decl weak now. */
4823 maybe_apply_pragma_weak (decl);
4825 /* Output the assembler code and/or RTL code for variables and functions,
4826 unless the type is an undefined structure or union.
4827 If not, it will get done when the type is completed. */
4829 if (VAR_OR_FUNCTION_DECL_P (decl))
4831 /* Determine the ELF visibility. */
4832 if (TREE_PUBLIC (decl))
4833 c_determine_visibility (decl);
4835 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4836 if (c_dialect_objc ())
4837 objc_check_decl (decl);
4841 /* If this is not a static variable, issue a warning.
4842 It doesn't make any sense to give an ASMSPEC for an
4843 ordinary, non-register local variable. Historically,
4844 GCC has accepted -- but ignored -- the ASMSPEC in
4846 if (!DECL_FILE_SCOPE_P (decl)
4848 && !C_DECL_REGISTER (decl)
4849 && !TREE_STATIC (decl))
4850 warning (0, "ignoring asm-specifier for non-static local "
4851 "variable %q+D", decl);
4853 set_user_assembler_name (decl, asmspec);
4856 if (DECL_FILE_SCOPE_P (decl))
4858 if (DECL_INITIAL (decl) == NULL_TREE
4859 || DECL_INITIAL (decl) == error_mark_node)
4860 /* Don't output anything
4861 when a tentative file-scope definition is seen.
4862 But at end of compilation, do output code for them. */
4863 DECL_DEFER_OUTPUT (decl) = 1;
4864 if (asmspec && C_DECL_REGISTER (decl))
4865 DECL_HARD_REGISTER (decl) = 1;
4866 rest_of_decl_compilation (decl, true, 0);
4870 /* In conjunction with an ASMSPEC, the `register'
4871 keyword indicates that we should place the variable
4872 in a particular register. */
4873 if (asmspec && C_DECL_REGISTER (decl))
4875 DECL_HARD_REGISTER (decl) = 1;
4876 /* This cannot be done for a structure with volatile
4877 fields, on which DECL_REGISTER will have been
4879 if (!DECL_REGISTER (decl))
4880 error ("cannot put object with volatile field into register");
4883 if (TREE_CODE (decl) != FUNCTION_DECL)
4885 /* If we're building a variable sized type, and we might be
4886 reachable other than via the top of the current binding
4887 level, then create a new BIND_EXPR so that we deallocate
4888 the object at the right time. */
4889 /* Note that DECL_SIZE can be null due to errors. */
4890 if (DECL_SIZE (decl)
4891 && !TREE_CONSTANT (DECL_SIZE (decl))
4892 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
4895 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
4896 TREE_SIDE_EFFECTS (bind) = 1;
4898 BIND_EXPR_BODY (bind) = push_stmt_list ();
4900 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
4906 if (!DECL_FILE_SCOPE_P (decl))
4908 /* Recompute the RTL of a local array now
4909 if it used to be an incomplete type. */
4910 if (was_incomplete && !is_global_var (decl))
4912 /* If we used it already as memory, it must stay in memory. */
4913 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4914 /* If it's still incomplete now, no init will save it. */
4915 if (DECL_SIZE (decl) == 0)
4916 DECL_INITIAL (decl) = 0;
4921 if (TREE_CODE (decl) == TYPE_DECL)
4923 if (!DECL_FILE_SCOPE_P (decl)
4924 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
4925 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
4927 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
4930 /* Install a cleanup (aka destructor) if one was given. */
4931 if (VAR_P (decl) && !TREE_STATIC (decl))
4933 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
4936 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
4937 tree cleanup_decl = lookup_name (cleanup_id);
4939 vec<tree, va_gc> *v;
4941 /* Build "cleanup(&decl)" for the destructor. */
4942 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
4944 v->quick_push (cleanup);
4945 cleanup = c_build_function_call_vec (DECL_SOURCE_LOCATION (decl),
4946 vNULL, cleanup_decl, v, NULL);
4949 /* Don't warn about decl unused; the cleanup uses it. */
4950 TREE_USED (decl) = 1;
4951 TREE_USED (cleanup_decl) = 1;
4952 DECL_READ_P (decl) = 1;
4954 push_cleanup (decl, cleanup, false);
4960 && !DECL_EXTERNAL (decl)
4961 && DECL_INITIAL (decl) == NULL_TREE)
4963 type = strip_array_types (type);
4964 if (TREE_READONLY (decl))
4965 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4966 "uninitialized const %qD is invalid in C++", decl);
4967 else if ((TREE_CODE (type) == RECORD_TYPE
4968 || TREE_CODE (type) == UNION_TYPE)
4969 && C_TYPE_FIELDS_READONLY (type))
4970 diagnose_uninitialized_cst_member (decl, type);
4973 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
4976 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4977 EXPR is NULL or a pointer to an expression that needs to be
4978 evaluated for the side effects of array size expressions in the
4982 grokparm (const struct c_parm *parm, tree *expr)
4984 tree attrs = parm->attrs;
4985 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
4986 NULL, &attrs, expr, NULL, DEPRECATED_NORMAL);
4988 decl_attributes (&decl, attrs, 0);
4993 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4994 and push that on the current scope. EXPR is a pointer to an
4995 expression that needs to be evaluated for the side effects of array
4996 size expressions in the parameters. */
4999 push_parm_decl (const struct c_parm *parm, tree *expr)
5001 tree attrs = parm->attrs;
5004 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
5005 &attrs, expr, NULL, DEPRECATED_NORMAL);
5006 decl_attributes (&decl, attrs, 0);
5008 decl = pushdecl (decl);
5010 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
5013 /* Mark all the parameter declarations to date as forward decls.
5014 Also diagnose use of this extension. */
5017 mark_forward_parm_decls (void)
5019 struct c_binding *b;
5021 if (pedantic && !current_scope->warned_forward_parm_decls)
5023 pedwarn (input_location, OPT_Wpedantic,
5024 "ISO C forbids forward parameter declarations");
5025 current_scope->warned_forward_parm_decls = true;
5028 for (b = current_scope->bindings; b; b = b->prev)
5029 if (TREE_CODE (b->decl) == PARM_DECL)
5030 TREE_ASM_WRITTEN (b->decl) = 1;
5033 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5034 literal, which may be an incomplete array type completed by the
5035 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5036 literal. NON_CONST is true if the initializers contain something
5037 that cannot occur in a constant expression. */
5040 build_compound_literal (location_t loc, tree type, tree init, bool non_const)
5042 /* We do not use start_decl here because we have a type, not a declarator;
5043 and do not use finish_decl because the decl should be stored inside
5044 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5049 if (type == error_mark_node
5050 || init == error_mark_node)
5051 return error_mark_node;
5053 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
5054 DECL_EXTERNAL (decl) = 0;
5055 TREE_PUBLIC (decl) = 0;
5056 TREE_STATIC (decl) = (current_scope == file_scope);
5057 DECL_CONTEXT (decl) = current_function_decl;
5058 TREE_USED (decl) = 1;
5059 DECL_READ_P (decl) = 1;
5060 TREE_TYPE (decl) = type;
5061 TREE_READONLY (decl) = (TYPE_READONLY (type)
5062 || (TREE_CODE (type) == ARRAY_TYPE
5063 && TYPE_READONLY (TREE_TYPE (type))));
5064 store_init_value (loc, decl, init, NULL_TREE);
5066 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
5068 int failure = complete_array_type (&TREE_TYPE (decl),
5069 DECL_INITIAL (decl), true);
5070 /* If complete_array_type returns 3, it means that the
5071 initial value of the compound literal is empty. Allow it. */
5072 gcc_assert (failure == 0 || failure == 3);
5074 type = TREE_TYPE (decl);
5075 TREE_TYPE (DECL_INITIAL (decl)) = type;
5078 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
5080 c_incomplete_type_error (NULL_TREE, type);
5081 return error_mark_node;
5084 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
5085 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
5086 TREE_SIDE_EFFECTS (complit) = 1;
5088 layout_decl (decl, 0);
5090 if (TREE_STATIC (decl))
5092 /* This decl needs a name for the assembler output. */
5093 set_compound_literal_name (decl);
5094 DECL_DEFER_OUTPUT (decl) = 1;
5095 DECL_COMDAT (decl) = 1;
5096 DECL_ARTIFICIAL (decl) = 1;
5097 DECL_IGNORED_P (decl) = 1;
5099 rest_of_decl_compilation (decl, 1, 0);
5104 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
5105 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
5111 /* Check the type of a compound literal. Here we just check that it
5112 is valid for C++. */
5115 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
5118 && (type_name->specs->typespec_kind == ctsk_tagdef
5119 || type_name->specs->typespec_kind == ctsk_tagfirstref))
5120 warning_at (loc, OPT_Wc___compat,
5121 "defining a type in a compound literal is invalid in C++");
5124 /* Determine whether TYPE is a structure with a flexible array member,
5125 or a union containing such a structure (possibly recursively). */
5128 flexible_array_type_p (tree type)
5131 switch (TREE_CODE (type))
5134 x = TYPE_FIELDS (type);
5137 while (DECL_CHAIN (x) != NULL_TREE)
5139 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5140 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5141 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5142 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5146 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x))
5148 if (flexible_array_type_p (TREE_TYPE (x)))
5157 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
5158 replacing with appropriate values if they are invalid. */
5160 check_bitfield_type_and_width (tree *type, tree *width, tree orig_name)
5163 unsigned int max_width;
5164 unsigned HOST_WIDE_INT w;
5165 const char *name = (orig_name
5166 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
5167 : _("<anonymous>"));
5169 /* Detect and ignore out of range field width and process valid
5171 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)))
5173 error ("bit-field %qs width not an integer constant", name);
5174 *width = integer_one_node;
5178 if (TREE_CODE (*width) != INTEGER_CST)
5180 *width = c_fully_fold (*width, false, NULL);
5181 if (TREE_CODE (*width) == INTEGER_CST)
5182 pedwarn (input_location, OPT_Wpedantic,
5183 "bit-field %qs width not an integer constant expression",
5186 if (TREE_CODE (*width) != INTEGER_CST)
5188 error ("bit-field %qs width not an integer constant", name);
5189 *width = integer_one_node;
5191 constant_expression_warning (*width);
5192 if (tree_int_cst_sgn (*width) < 0)
5194 error ("negative width in bit-field %qs", name);
5195 *width = integer_one_node;
5197 else if (integer_zerop (*width) && orig_name)
5199 error ("zero width for bit-field %qs", name);
5200 *width = integer_one_node;
5204 /* Detect invalid bit-field type. */
5205 if (TREE_CODE (*type) != INTEGER_TYPE
5206 && TREE_CODE (*type) != BOOLEAN_TYPE
5207 && TREE_CODE (*type) != ENUMERAL_TYPE)
5209 error ("bit-field %qs has invalid type", name);
5210 *type = unsigned_type_node;
5213 type_mv = TYPE_MAIN_VARIANT (*type);
5214 if (!in_system_header_at (input_location)
5215 && type_mv != integer_type_node
5216 && type_mv != unsigned_type_node
5217 && type_mv != boolean_type_node)
5218 pedwarn_c90 (input_location, OPT_Wpedantic,
5219 "type of bit-field %qs is a GCC extension", name);
5221 max_width = TYPE_PRECISION (*type);
5223 if (0 < compare_tree_int (*width, max_width))
5225 error ("width of %qs exceeds its type", name);
5227 *width = build_int_cst (integer_type_node, w);
5230 w = tree_to_uhwi (*width);
5232 if (TREE_CODE (*type) == ENUMERAL_TYPE)
5234 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
5236 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_SIGN (*type))
5237 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_SIGN (*type)))
5238 warning (0, "%qs is narrower than values of its type", name);
5244 /* Print warning about variable length array if necessary. */
5247 warn_variable_length_array (tree name, tree size)
5249 if (TREE_CONSTANT (size))
5252 pedwarn_c90 (input_location, OPT_Wvla,
5253 "ISO C90 forbids array %qE whose size "
5254 "can%'t be evaluated", name);
5256 pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids array "
5257 "whose size can%'t be evaluated");
5262 pedwarn_c90 (input_location, OPT_Wvla,
5263 "ISO C90 forbids variable length array %qE", name);
5265 pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids variable "
5270 /* Print warning about defaulting to int if necessary. */
5273 warn_defaults_to (location_t location, int opt, const char *gmsgid, ...)
5275 diagnostic_info diagnostic;
5278 va_start (ap, gmsgid);
5279 diagnostic_set_info (&diagnostic, gmsgid, &ap, location,
5280 flag_isoc99 ? DK_PEDWARN : DK_WARNING);
5281 diagnostic.option_index = opt;
5282 report_diagnostic (&diagnostic);
5286 /* Given declspecs and a declarator,
5287 determine the name and type of the object declared
5288 and construct a ..._DECL node for it.
5289 (In one case we can return a ..._TYPE node instead.
5290 For invalid input we sometimes return 0.)
5292 DECLSPECS is a c_declspecs structure for the declaration specifiers.
5294 DECL_CONTEXT says which syntactic context this declaration is in:
5295 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
5296 FUNCDEF for a function definition. Like NORMAL but a few different
5297 error messages in each case. Return value may be zero meaning
5298 this definition is too screwy to try to parse.
5299 PARM for a parameter declaration (either within a function prototype
5300 or before a function body). Make a PARM_DECL, or return void_type_node.
5301 TYPENAME if for a typename (in a cast or sizeof).
5302 Don't make a DECL node; just return the ..._TYPE node.
5303 FIELD for a struct or union field; make a FIELD_DECL.
5304 INITIALIZED is true if the decl has an initializer.
5305 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
5306 representing the width of the bit-field.
5307 DECL_ATTRS points to the list of attributes that should be added to this
5308 decl. Any nested attributes that belong on the decl itself will be
5310 If EXPR is not NULL, any expressions that need to be evaluated as
5311 part of evaluating variably modified types will be stored in *EXPR.
5312 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
5313 set to indicate whether operands in *EXPR can be used in constant
5315 DEPRECATED_STATE is a deprecated_states value indicating whether
5316 deprecation warnings should be suppressed.
5318 In the TYPENAME case, DECLARATOR is really an absolute declarator.
5319 It may also be so in the PARM case, for a prototype where the
5320 argument type is specified but not the name.
5322 This function is where the complicated C meanings of `static'
5323 and `extern' are interpreted. */
5326 grokdeclarator (const struct c_declarator *declarator,
5327 struct c_declspecs *declspecs,
5328 enum decl_context decl_context, bool initialized, tree *width,
5329 tree *decl_attrs, tree *expr, bool *expr_const_operands,
5330 enum deprecated_states deprecated_state)
5332 tree type = declspecs->type;
5333 bool threadp = declspecs->thread_p;
5334 enum c_storage_class storage_class = declspecs->storage_class;
5339 int type_quals = TYPE_UNQUALIFIED;
5340 tree name = NULL_TREE;
5341 bool funcdef_flag = false;
5342 bool funcdef_syntax = false;
5343 bool size_varies = false;
5344 tree decl_attr = declspecs->decl_attr;
5345 int array_ptr_quals = TYPE_UNQUALIFIED;
5346 tree array_ptr_attrs = NULL_TREE;
5347 int array_parm_static = 0;
5348 bool array_parm_vla_unspec_p = false;
5349 tree returned_attrs = NULL_TREE;
5350 bool bitfield = width != NULL;
5352 struct c_arg_info *arg_info = 0;
5353 addr_space_t as1, as2, address_space;
5354 location_t loc = UNKNOWN_LOCATION;
5357 bool expr_const_operands_dummy;
5358 enum c_declarator_kind first_non_attr_kind;
5359 unsigned int alignas_align = 0;
5361 if (TREE_CODE (type) == ERROR_MARK)
5362 return error_mark_node;
5365 if (expr_const_operands == NULL)
5366 expr_const_operands = &expr_const_operands_dummy;
5368 *expr = declspecs->expr;
5369 *expr_const_operands = declspecs->expr_const_operands;
5371 if (decl_context == FUNCDEF)
5372 funcdef_flag = true, decl_context = NORMAL;
5374 /* Look inside a declarator for the name being declared
5375 and get it as an IDENTIFIER_NODE, for an error message. */
5377 const struct c_declarator *decl = declarator;
5379 first_non_attr_kind = cdk_attrs;
5389 funcdef_syntax = (decl->kind == cdk_function);
5390 decl = decl->declarator;
5391 if (first_non_attr_kind == cdk_attrs)
5392 first_non_attr_kind = decl->kind;
5396 decl = decl->declarator;
5403 if (first_non_attr_kind == cdk_attrs)
5404 first_non_attr_kind = decl->kind;
5413 gcc_assert (decl_context == PARM
5414 || decl_context == TYPENAME
5415 || (decl_context == FIELD
5416 && declarator->kind == cdk_id));
5417 gcc_assert (!initialized);
5421 /* A function definition's declarator must have the form of
5422 a function declarator. */
5424 if (funcdef_flag && !funcdef_syntax)
5427 /* If this looks like a function definition, make it one,
5428 even if it occurs where parms are expected.
5429 Then store_parm_decls will reject it and not use it as a parm. */
5430 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
5431 decl_context = PARM;
5433 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
5434 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
5436 if ((decl_context == NORMAL || decl_context == FIELD)
5437 && current_scope == file_scope
5438 && variably_modified_type_p (type, NULL_TREE))
5441 error_at (loc, "variably modified %qE at file scope", name);
5443 error_at (loc, "variably modified field at file scope");
5444 type = integer_type_node;
5447 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
5449 /* Diagnose defaulting to "int". */
5451 if (declspecs->default_int_p && !in_system_header_at (input_location))
5453 /* Issue a warning if this is an ISO C 99 program or if
5454 -Wreturn-type and this is a function, or if -Wimplicit;
5455 prefer the former warning since it is more explicit. */
5456 if ((warn_implicit_int || warn_return_type || flag_isoc99)
5458 warn_about_return_type = 1;
5462 warn_defaults_to (loc, OPT_Wimplicit_int,
5463 "type defaults to %<int%> in declaration "
5466 warn_defaults_to (loc, OPT_Wimplicit_int,
5467 "type defaults to %<int%> in type name");
5471 /* Adjust the type if a bit-field is being declared,
5472 -funsigned-bitfields applied and the type is not explicitly
5474 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
5475 && TREE_CODE (type) == INTEGER_TYPE)
5476 type = unsigned_type_for (type);
5478 /* Figure out the type qualifiers for the declaration. There are
5479 two ways a declaration can become qualified. One is something
5480 like `const int i' where the `const' is explicit. Another is
5481 something like `typedef const int CI; CI i' where the type of the
5482 declaration contains the `const'. A third possibility is that
5483 there is a type qualifier on the element type of a typedefed
5484 array type, in which case we should extract that qualifier so
5485 that c_apply_type_quals_to_decl receives the full list of
5486 qualifiers to work with (C90 is not entirely clear about whether
5487 duplicate qualifiers should be diagnosed in this case, but it
5488 seems most appropriate to do so). */
5489 element_type = strip_array_types (type);
5490 constp = declspecs->const_p + TYPE_READONLY (element_type);
5491 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
5492 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
5493 atomicp = declspecs->atomic_p + TYPE_ATOMIC (element_type);
5494 as1 = declspecs->address_space;
5495 as2 = TYPE_ADDR_SPACE (element_type);
5496 address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1;
5499 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<const%>");
5501 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<restrict%>");
5503 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<volatile%>");
5505 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<_Atomic%>");
5507 if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2)
5508 error_at (loc, "conflicting named address spaces (%s vs %s)",
5509 c_addr_space_name (as1), c_addr_space_name (as2));
5511 if ((TREE_CODE (type) == ARRAY_TYPE
5512 || first_non_attr_kind == cdk_array)
5513 && TYPE_QUALS (element_type))
5514 type = TYPE_MAIN_VARIANT (type);
5515 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
5516 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
5517 | (volatilep ? TYPE_QUAL_VOLATILE : 0)
5518 | (atomicp ? TYPE_QUAL_ATOMIC : 0)
5519 | ENCODE_QUAL_ADDR_SPACE (address_space));
5521 /* Applying the _Atomic qualifier to an array type (through the use
5522 of typedefs or typeof) must be detected here. If the qualifier
5523 is introduced later, any appearance of applying it to an array is
5524 actually applying it to an element of that array. */
5525 if (atomicp && TREE_CODE (type) == ARRAY_TYPE)
5526 error_at (loc, "%<_Atomic%>-qualified array type");
5528 /* Warn about storage classes that are invalid for certain
5529 kinds of declarations (parameters, typenames, etc.). */
5533 || storage_class == csc_auto
5534 || storage_class == csc_register
5535 || storage_class == csc_typedef))
5537 if (storage_class == csc_auto)
5539 (current_scope == file_scope) ? 0 : OPT_Wpedantic,
5540 "function definition declared %<auto%>");
5541 if (storage_class == csc_register)
5542 error_at (loc, "function definition declared %<register%>");
5543 if (storage_class == csc_typedef)
5544 error_at (loc, "function definition declared %<typedef%>");
5546 error_at (loc, "function definition declared %qs",
5547 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
5549 if (storage_class == csc_auto
5550 || storage_class == csc_register
5551 || storage_class == csc_typedef)
5552 storage_class = csc_none;
5554 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
5556 if (decl_context == PARM && storage_class == csc_register)
5560 switch (decl_context)
5564 error_at (loc, "storage class specified for structure "
5567 error_at (loc, "storage class specified for structure field");
5571 error_at (loc, "storage class specified for parameter %qE",
5574 error_at (loc, "storage class specified for unnamed parameter");
5577 error_at (loc, "storage class specified for typename");
5580 storage_class = csc_none;
5584 else if (storage_class == csc_extern
5588 /* 'extern' with initialization is invalid if not at file scope. */
5589 if (current_scope == file_scope)
5591 /* It is fine to have 'extern const' when compiling at C
5592 and C++ intersection. */
5593 if (!(warn_cxx_compat && constp))
5594 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
5598 error_at (loc, "%qE has both %<extern%> and initializer", name);
5600 else if (current_scope == file_scope)
5602 if (storage_class == csc_auto)
5603 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
5605 if (pedantic && storage_class == csc_register)
5606 pedwarn (input_location, OPT_Wpedantic,
5607 "file-scope declaration of %qE specifies %<register%>", name);
5611 if (storage_class == csc_extern && funcdef_flag)
5612 error_at (loc, "nested function %qE declared %<extern%>", name);
5613 else if (threadp && storage_class == csc_none)
5615 error_at (loc, "function-scope %qE implicitly auto and declared "
5617 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
5622 /* Now figure out the structure of the declarator proper.
5623 Descend through it, creating more complex types, until we reach
5624 the declared identifier (or NULL_TREE, in an absolute declarator).
5625 At each stage we maintain an unqualified version of the type
5626 together with any qualifiers that should be applied to it with
5627 c_build_qualified_type; this way, array types including
5628 multidimensional array types are first built up in unqualified
5629 form and then the qualified form is created with
5630 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5632 while (declarator && declarator->kind != cdk_id)
5634 if (type == error_mark_node)
5636 declarator = declarator->declarator;
5640 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5641 a cdk_pointer (for *...),
5642 a cdk_function (for ...(...)),
5643 a cdk_attrs (for nested attributes),
5644 or a cdk_id (for the name being declared
5645 or the place in an absolute declarator
5646 where the name was omitted).
5647 For the last case, we have just exited the loop.
5649 At this point, TYPE is the type of elements of an array,
5650 or for a function to return, or for a pointer to point to.
5651 After this sequence of ifs, TYPE is the type of the
5652 array or function or pointer, and DECLARATOR has had its
5653 outermost layer removed. */
5655 if (array_ptr_quals != TYPE_UNQUALIFIED
5656 || array_ptr_attrs != NULL_TREE
5657 || array_parm_static)
5659 /* Only the innermost declarator (making a parameter be of
5660 array type which is converted to pointer type)
5661 may have static or type qualifiers. */
5662 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5663 array_ptr_quals = TYPE_UNQUALIFIED;
5664 array_ptr_attrs = NULL_TREE;
5665 array_parm_static = 0;
5668 switch (declarator->kind)
5672 /* A declarator with embedded attributes. */
5673 tree attrs = declarator->u.attrs;
5674 const struct c_declarator *inner_decl;
5676 declarator = declarator->declarator;
5677 inner_decl = declarator;
5678 while (inner_decl->kind == cdk_attrs)
5679 inner_decl = inner_decl->declarator;
5680 if (inner_decl->kind == cdk_id)
5681 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
5682 else if (inner_decl->kind == cdk_function)
5683 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
5684 else if (inner_decl->kind == cdk_array)
5685 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
5686 returned_attrs = decl_attributes (&type,
5687 chainon (returned_attrs, attrs),
5693 tree itype = NULL_TREE;
5694 tree size = declarator->u.array.dimen;
5695 /* The index is a signed object `sizetype' bits wide. */
5696 tree index_type = c_common_signed_type (sizetype);
5698 array_ptr_quals = declarator->u.array.quals;
5699 array_ptr_attrs = declarator->u.array.attrs;
5700 array_parm_static = declarator->u.array.static_p;
5701 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
5703 declarator = declarator->declarator;
5705 /* Check for some types that there cannot be arrays of. */
5707 if (VOID_TYPE_P (type))
5710 error_at (loc, "declaration of %qE as array of voids", name);
5712 error_at (loc, "declaration of type name as array of voids");
5713 type = error_mark_node;
5716 if (TREE_CODE (type) == FUNCTION_TYPE)
5719 error_at (loc, "declaration of %qE as array of functions",
5722 error_at (loc, "declaration of type name as array of "
5724 type = error_mark_node;
5727 if (pedantic && !in_system_header_at (input_location)
5728 && flexible_array_type_p (type))
5729 pedwarn (loc, OPT_Wpedantic,
5730 "invalid use of structure with flexible array member");
5732 if (size == error_mark_node)
5733 type = error_mark_node;
5735 if (type == error_mark_node)
5738 /* If size was specified, set ITYPE to a range-type for
5739 that size. Otherwise, ITYPE remains null. finish_decl
5740 may figure it out from an initial value. */
5744 bool size_maybe_const = true;
5745 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
5746 && !TREE_OVERFLOW (size));
5747 bool this_size_varies = false;
5749 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5751 STRIP_TYPE_NOPS (size);
5753 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
5756 error_at (loc, "size of array %qE has non-integer type",
5760 "size of unnamed array has non-integer type");
5761 size = integer_one_node;
5764 size = c_fully_fold (size, false, &size_maybe_const);
5766 if (pedantic && size_maybe_const && integer_zerop (size))
5769 pedwarn (loc, OPT_Wpedantic,
5770 "ISO C forbids zero-size array %qE", name);
5772 pedwarn (loc, OPT_Wpedantic,
5773 "ISO C forbids zero-size array");
5776 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
5778 constant_expression_warning (size);
5779 if (tree_int_cst_sgn (size) < 0)
5782 error_at (loc, "size of array %qE is negative", name);
5784 error_at (loc, "size of unnamed array is negative");
5785 size = integer_one_node;
5787 /* Handle a size folded to an integer constant but
5788 not an integer constant expression. */
5789 if (!size_int_const)
5791 /* If this is a file scope declaration of an
5792 ordinary identifier, this is invalid code;
5793 diagnosing it here and not subsequently
5794 treating the type as variable-length avoids
5795 more confusing diagnostics later. */
5796 if ((decl_context == NORMAL || decl_context == FIELD)
5797 && current_scope == file_scope)
5798 pedwarn (input_location, 0,
5799 "variably modified %qE at file scope",
5802 this_size_varies = size_varies = true;
5803 warn_variable_length_array (name, size);
5806 else if ((decl_context == NORMAL || decl_context == FIELD)
5807 && current_scope == file_scope)
5809 error_at (loc, "variably modified %qE at file scope", name);
5810 size = integer_one_node;
5814 /* Make sure the array size remains visibly
5815 nonconstant even if it is (eg) a const variable
5816 with known value. */
5817 this_size_varies = size_varies = true;
5818 warn_variable_length_array (name, size);
5819 if (flag_sanitize & SANITIZE_VLA
5820 && decl_context == NORMAL
5821 && do_ubsan_in_current_function ())
5823 /* Evaluate the array size only once. */
5824 size = c_save_expr (size);
5825 size = c_fully_fold (size, false, NULL);
5826 size = fold_build2 (COMPOUND_EXPR, TREE_TYPE (size),
5827 ubsan_instrument_vla (loc, size),
5832 if (integer_zerop (size) && !this_size_varies)
5834 /* A zero-length array cannot be represented with
5835 an unsigned index type, which is what we'll
5836 get with build_index_type. Create an
5837 open-ended range instead. */
5838 itype = build_range_type (sizetype, size, NULL_TREE);
5842 /* Arrange for the SAVE_EXPR on the inside of the
5843 MINUS_EXPR, which allows the -1 to get folded
5844 with the +1 that happens when building TYPE_SIZE. */
5846 size = save_expr (size);
5847 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
5848 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5849 integer_zero_node, size);
5851 /* Compute the maximum valid index, that is, size
5852 - 1. Do the calculation in index_type, so that
5853 if it is a variable the computations will be
5854 done in the proper mode. */
5855 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
5856 convert (index_type, size),
5857 convert (index_type,
5860 /* The above overflows when size does not fit
5862 ??? While a size of INT_MAX+1 technically shouldn't
5863 cause an overflow (because we subtract 1), handling
5864 this case seems like an unnecessary complication. */
5865 if (TREE_CODE (size) == INTEGER_CST
5866 && !int_fits_type_p (size, index_type))
5869 error_at (loc, "size of array %qE is too large",
5872 error_at (loc, "size of unnamed array is too large");
5873 type = error_mark_node;
5877 itype = build_index_type (itype);
5879 if (this_size_varies)
5882 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5886 *expr_const_operands &= size_maybe_const;
5889 else if (decl_context == FIELD)
5891 bool flexible_array_member = false;
5892 if (array_parm_vla_unspec_p)
5893 /* Field names can in fact have function prototype
5894 scope so [*] is disallowed here through making
5895 the field variably modified, not through being
5896 something other than a declaration with function
5901 const struct c_declarator *t = declarator;
5902 while (t->kind == cdk_attrs)
5904 flexible_array_member = (t->kind == cdk_id);
5906 if (flexible_array_member
5907 && !in_system_header_at (input_location))
5908 pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not "
5909 "support flexible array members");
5911 /* ISO C99 Flexible array members are effectively
5912 identical to GCC's zero-length array extension. */
5913 if (flexible_array_member || array_parm_vla_unspec_p)
5914 itype = build_range_type (sizetype, size_zero_node,
5917 else if (decl_context == PARM)
5919 if (array_parm_vla_unspec_p)
5921 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
5925 else if (decl_context == TYPENAME)
5927 if (array_parm_vla_unspec_p)
5930 warning (0, "%<[*]%> not in a declaration");
5931 /* We use this to avoid messing up with incomplete
5932 array types of the same type, that would
5933 otherwise be modified below. */
5934 itype = build_range_type (sizetype, size_zero_node,
5940 /* Complain about arrays of incomplete types. */
5941 if (!COMPLETE_TYPE_P (type))
5943 error_at (loc, "array type has incomplete element type %qT",
5945 type = error_mark_node;
5948 /* When itype is NULL, a shared incomplete array type is
5949 returned for all array of a given type. Elsewhere we
5950 make sure we don't complete that type before copying
5951 it, but here we want to make sure we don't ever
5952 modify the shared type, so we gcc_assert (itype)
5955 addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals);
5956 if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type))
5957 type = build_qualified_type (type,
5958 ENCODE_QUAL_ADDR_SPACE (as));
5960 type = build_array_type (type, itype);
5963 if (type != error_mark_node)
5967 /* It is ok to modify type here even if itype is
5968 NULL: if size_varies, we're in a
5969 multi-dimensional array and the inner type has
5970 variable size, so the enclosing shared array type
5972 if (size && TREE_CODE (size) == INTEGER_CST)
5974 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5975 C_TYPE_VARIABLE_SIZE (type) = 1;
5978 /* The GCC extension for zero-length arrays differs from
5979 ISO flexible array members in that sizeof yields
5981 if (size && integer_zerop (size))
5984 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5985 TYPE_SIZE (type) = bitsize_zero_node;
5986 TYPE_SIZE_UNIT (type) = size_zero_node;
5987 SET_TYPE_STRUCTURAL_EQUALITY (type);
5989 if (array_parm_vla_unspec_p)
5992 /* The type is complete. C99 6.7.5.2p4 */
5993 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5994 TYPE_SIZE (type) = bitsize_zero_node;
5995 TYPE_SIZE_UNIT (type) = size_zero_node;
5996 SET_TYPE_STRUCTURAL_EQUALITY (type);
6000 if (decl_context != PARM
6001 && (array_ptr_quals != TYPE_UNQUALIFIED
6002 || array_ptr_attrs != NULL_TREE
6003 || array_parm_static))
6005 error_at (loc, "static or type qualifiers in non-parameter array declarator");
6006 array_ptr_quals = TYPE_UNQUALIFIED;
6007 array_ptr_attrs = NULL_TREE;
6008 array_parm_static = 0;
6014 /* Say it's a definition only for the declarator closest
6015 to the identifier, apart possibly from some
6017 bool really_funcdef = false;
6021 const struct c_declarator *t = declarator->declarator;
6022 while (t->kind == cdk_attrs)
6024 really_funcdef = (t->kind == cdk_id);
6027 /* Declaring a function type. Make sure we have a valid
6028 type for the function to return. */
6029 if (type == error_mark_node)
6032 size_varies = false;
6034 /* Warn about some types functions can't return. */
6035 if (TREE_CODE (type) == FUNCTION_TYPE)
6038 error_at (loc, "%qE declared as function returning a "
6041 error_at (loc, "type name declared as function "
6042 "returning a function");
6043 type = integer_type_node;
6045 if (TREE_CODE (type) == ARRAY_TYPE)
6048 error_at (loc, "%qE declared as function returning an array",
6051 error_at (loc, "type name declared as function returning "
6053 type = integer_type_node;
6055 errmsg = targetm.invalid_return_type (type);
6059 type = integer_type_node;
6062 /* Construct the function type and go to the next
6063 inner layer of declarator. */
6064 arg_info = declarator->u.arg_info;
6065 arg_types = grokparms (arg_info, really_funcdef);
6067 /* Type qualifiers before the return type of the function
6068 qualify the return type, not the function type. */
6071 /* Type qualifiers on a function return type are
6072 normally permitted by the standard but have no
6073 effect, so give a warning at -Wreturn-type.
6074 Qualifiers on a void return type are banned on
6075 function definitions in ISO C; GCC used to used
6076 them for noreturn functions. */
6077 if (VOID_TYPE_P (type) && really_funcdef)
6079 "function definition has qualified void return type");
6081 warning_at (loc, OPT_Wignored_qualifiers,
6082 "type qualifiers ignored on function return type");
6084 type = c_build_qualified_type (type, type_quals);
6086 type_quals = TYPE_UNQUALIFIED;
6088 type = build_function_type (type, arg_types);
6089 declarator = declarator->declarator;
6091 /* Set the TYPE_CONTEXTs for each tagged type which is local to
6092 the formal parameter list of this FUNCTION_TYPE to point to
6093 the FUNCTION_TYPE node itself. */
6098 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
6099 TYPE_CONTEXT (tag->type) = type;
6105 /* Merge any constancy or volatility into the target type
6107 if ((type_quals & TYPE_QUAL_ATOMIC)
6108 && TREE_CODE (type) == FUNCTION_TYPE)
6111 "%<_Atomic%>-qualified function type");
6112 type_quals &= ~TYPE_QUAL_ATOMIC;
6114 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
6116 pedwarn (loc, OPT_Wpedantic,
6117 "ISO C forbids qualified function types");
6119 type = c_build_qualified_type (type, type_quals);
6120 size_varies = false;
6122 /* When the pointed-to type involves components of variable size,
6123 care must be taken to ensure that the size evaluation code is
6124 emitted early enough to dominate all the possible later uses
6125 and late enough for the variables on which it depends to have
6128 This is expected to happen automatically when the pointed-to
6129 type has a name/declaration of it's own, but special attention
6130 is required if the type is anonymous.
6132 We handle the NORMAL and FIELD contexts here by attaching an
6133 artificial TYPE_DECL to such pointed-to type. This forces the
6134 sizes evaluation at a safe point and ensures it is not deferred
6135 until e.g. within a deeper conditional context.
6137 We expect nothing to be needed here for PARM or TYPENAME.
6138 Pushing a TYPE_DECL at this point for TYPENAME would actually
6139 be incorrect, as we might be in the middle of an expression
6140 with side effects on the pointed-to type size "arguments" prior
6141 to the pointer declaration point and the fake TYPE_DECL in the
6142 enclosing context would force the size evaluation prior to the
6145 if (!TYPE_NAME (type)
6146 && (decl_context == NORMAL || decl_context == FIELD)
6147 && variably_modified_type_p (type, NULL_TREE))
6149 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
6150 DECL_ARTIFICIAL (decl) = 1;
6152 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
6153 TYPE_NAME (type) = decl;
6156 type = c_build_pointer_type (type);
6158 /* Process type qualifiers (such as const or volatile)
6159 that were given inside the `*'. */
6160 type_quals = declarator->u.pointer_quals;
6162 declarator = declarator->declarator;
6169 *decl_attrs = chainon (returned_attrs, *decl_attrs);
6171 /* Now TYPE has the actual type, apart from any qualifiers in
6174 /* Warn about address space used for things other than static memory or
6176 address_space = DECODE_QUAL_ADDR_SPACE (type_quals);
6177 if (!ADDR_SPACE_GENERIC_P (address_space))
6179 if (decl_context == NORMAL)
6181 switch (storage_class)
6184 error ("%qs combined with %<auto%> qualifier for %qE",
6185 c_addr_space_name (address_space), name);
6188 error ("%qs combined with %<register%> qualifier for %qE",
6189 c_addr_space_name (address_space), name);
6192 if (current_function_scope)
6194 error ("%qs specified for auto variable %qE",
6195 c_addr_space_name (address_space), name);
6207 else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE)
6210 error ("%qs specified for parameter %qE",
6211 c_addr_space_name (address_space), name);
6213 error ("%qs specified for unnamed parameter",
6214 c_addr_space_name (address_space));
6216 else if (decl_context == FIELD)
6219 error ("%qs specified for structure field %qE",
6220 c_addr_space_name (address_space), name);
6222 error ("%qs specified for structure field",
6223 c_addr_space_name (address_space));
6227 /* Check the type and width of a bit-field. */
6230 check_bitfield_type_and_width (&type, width, name);
6231 /* C11 makes it implementation-defined (6.7.2.1#5) whether
6232 atomic types are permitted for bit-fields; we have no code to
6233 make bit-field accesses atomic, so disallow them. */
6234 if (type_quals & TYPE_QUAL_ATOMIC)
6237 error ("bit-field %qE has atomic type", name);
6239 error ("bit-field has atomic type");
6240 type_quals &= ~TYPE_QUAL_ATOMIC;
6244 /* Reject invalid uses of _Alignas. */
6245 if (declspecs->alignas_p)
6247 if (storage_class == csc_typedef)
6248 error_at (loc, "alignment specified for typedef %qE", name);
6249 else if (storage_class == csc_register)
6250 error_at (loc, "alignment specified for %<register%> object %qE",
6252 else if (decl_context == PARM)
6255 error_at (loc, "alignment specified for parameter %qE", name);
6257 error_at (loc, "alignment specified for unnamed parameter");
6262 error_at (loc, "alignment specified for bit-field %qE", name);
6264 error_at (loc, "alignment specified for unnamed bit-field");
6266 else if (TREE_CODE (type) == FUNCTION_TYPE)
6267 error_at (loc, "alignment specified for function %qE", name);
6268 else if (declspecs->align_log != -1)
6270 alignas_align = 1U << declspecs->align_log;
6271 if (alignas_align < min_align_of_type (type))
6274 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
6275 "alignment of %qE", name);
6277 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
6278 "alignment of unnamed field");
6284 /* Did array size calculations overflow or does the array cover more
6285 than half of the address-space? */
6286 if (TREE_CODE (type) == ARRAY_TYPE
6287 && COMPLETE_TYPE_P (type)
6288 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
6289 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type)))
6292 error_at (loc, "size of array %qE is too large", name);
6294 error_at (loc, "size of unnamed array is too large");
6295 /* If we proceed with the array type as it is, we'll eventually
6296 crash in tree_to_[su]hwi(). */
6297 type = error_mark_node;
6300 /* If this is declaring a typedef name, return a TYPE_DECL. */
6302 if (storage_class == csc_typedef)
6305 if ((type_quals & TYPE_QUAL_ATOMIC)
6306 && TREE_CODE (type) == FUNCTION_TYPE)
6309 "%<_Atomic%>-qualified function type");
6310 type_quals &= ~TYPE_QUAL_ATOMIC;
6312 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
6314 pedwarn (loc, OPT_Wpedantic,
6315 "ISO C forbids qualified function types");
6317 type = c_build_qualified_type (type, type_quals);
6318 decl = build_decl (declarator->id_loc,
6319 TYPE_DECL, declarator->u.id, type);
6320 if (declspecs->explicit_signed_p)
6321 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
6322 if (declspecs->inline_p)
6323 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
6324 if (declspecs->noreturn_p)
6325 pedwarn (loc, 0,"typedef %q+D declared %<_Noreturn%>", decl);
6327 if (warn_cxx_compat && declarator->u.id != NULL_TREE)
6329 struct c_binding *b = I_TAG_BINDING (declarator->u.id);
6332 && b->decl != NULL_TREE
6333 && (B_IN_CURRENT_SCOPE (b)
6334 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
6335 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
6337 warning_at (declarator->id_loc, OPT_Wc___compat,
6338 ("using %qD as both a typedef and a tag is "
6341 if (b->locus != UNKNOWN_LOCATION)
6342 inform (b->locus, "originally defined here");
6349 /* If this is a type name (such as, in a cast or sizeof),
6350 compute the type and return it now. */
6352 if (decl_context == TYPENAME)
6354 /* Note that the grammar rejects storage classes in typenames
6356 gcc_assert (storage_class == csc_none && !threadp
6357 && !declspecs->inline_p && !declspecs->noreturn_p);
6358 if ((type_quals & TYPE_QUAL_ATOMIC)
6359 && TREE_CODE (type) == FUNCTION_TYPE)
6362 "%<_Atomic%>-qualified function type");
6363 type_quals &= ~TYPE_QUAL_ATOMIC;
6365 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
6367 pedwarn (loc, OPT_Wpedantic,
6368 "ISO C forbids const or volatile function types");
6370 type = c_build_qualified_type (type, type_quals);
6374 if (pedantic && decl_context == FIELD
6375 && variably_modified_type_p (type, NULL_TREE))
6378 pedwarn (loc, OPT_Wpedantic, "a member of a structure or union cannot "
6379 "have a variably modified type");
6382 /* Aside from typedefs and type names (handle above),
6383 `void' at top level (not within pointer)
6384 is allowed only in public variables.
6385 We don't complain about parms either, but that is because
6386 a better error message can be made later. */
6388 if (VOID_TYPE_P (type) && decl_context != PARM
6389 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
6390 && (storage_class == csc_extern
6391 || (current_scope == file_scope
6392 && !(storage_class == csc_static
6393 || storage_class == csc_register)))))
6395 error_at (loc, "variable or field %qE declared void", name);
6396 type = integer_type_node;
6399 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6400 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6405 if (decl_context == PARM)
6408 bool array_parameter_p = false;
6410 /* A parameter declared as an array of T is really a pointer to T.
6411 One declared as a function is really a pointer to a function. */
6413 if (TREE_CODE (type) == ARRAY_TYPE)
6415 /* Transfer const-ness of array into that of type pointed to. */
6416 type = TREE_TYPE (type);
6418 type = c_build_qualified_type (type, type_quals);
6419 type = c_build_pointer_type (type);
6420 type_quals = array_ptr_quals;
6422 type = c_build_qualified_type (type, type_quals);
6424 /* We don't yet implement attributes in this context. */
6425 if (array_ptr_attrs != NULL_TREE)
6426 warning_at (loc, OPT_Wattributes,
6427 "attributes in parameter array declarator ignored");
6429 size_varies = false;
6430 array_parameter_p = true;
6432 else if (TREE_CODE (type) == FUNCTION_TYPE)
6434 if (type_quals & TYPE_QUAL_ATOMIC)
6437 "%<_Atomic%>-qualified function type");
6438 type_quals &= ~TYPE_QUAL_ATOMIC;
6440 else if (type_quals)
6441 pedwarn (loc, OPT_Wpedantic,
6442 "ISO C forbids qualified function types");
6444 type = c_build_qualified_type (type, type_quals);
6445 type = c_build_pointer_type (type);
6446 type_quals = TYPE_UNQUALIFIED;
6448 else if (type_quals)
6449 type = c_build_qualified_type (type, type_quals);
6451 decl = build_decl (declarator->id_loc,
6452 PARM_DECL, declarator->u.id, type);
6454 C_DECL_VARIABLE_SIZE (decl) = 1;
6455 C_ARRAY_PARAMETER (decl) = array_parameter_p;
6457 /* Compute the type actually passed in the parmlist,
6458 for the case where there is no prototype.
6459 (For example, shorts and chars are passed as ints.)
6460 When there is a prototype, this is overridden later. */
6462 if (type == error_mark_node)
6463 promoted_type = type;
6465 promoted_type = c_type_promotes_to (type);
6467 DECL_ARG_TYPE (decl) = promoted_type;
6468 if (declspecs->inline_p)
6469 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
6470 if (declspecs->noreturn_p)
6471 pedwarn (loc, 0, "parameter %q+D declared %<_Noreturn%>", decl);
6473 else if (decl_context == FIELD)
6475 /* Note that the grammar rejects storage classes in typenames
6477 gcc_assert (storage_class == csc_none && !threadp
6478 && !declspecs->inline_p && !declspecs->noreturn_p);
6480 /* Structure field. It may not be a function. */
6482 if (TREE_CODE (type) == FUNCTION_TYPE)
6484 error_at (loc, "field %qE declared as a function", name);
6485 type = build_pointer_type (type);
6487 else if (TREE_CODE (type) != ERROR_MARK
6488 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
6491 error_at (loc, "field %qE has incomplete type", name);
6493 error_at (loc, "unnamed field has incomplete type");
6494 type = error_mark_node;
6496 else if (TREE_CODE (type) == ARRAY_TYPE
6497 && TYPE_DOMAIN (type) == NULL_TREE)
6499 /* We have a flexible array member through a typedef.
6500 Set suitable range. Whether this is a correct position
6501 for a flexible array member will be determined elsewhere. */
6502 if (!in_system_header_at (input_location))
6503 pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not "
6504 "support flexible array members");
6505 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
6506 TYPE_DOMAIN (type) = build_range_type (sizetype, size_zero_node,
6509 type = c_build_qualified_type (type, type_quals);
6510 decl = build_decl (declarator->id_loc,
6511 FIELD_DECL, declarator->u.id, type);
6512 DECL_NONADDRESSABLE_P (decl) = bitfield;
6513 if (bitfield && !declarator->u.id)
6514 TREE_NO_WARNING (decl) = 1;
6517 C_DECL_VARIABLE_SIZE (decl) = 1;
6519 else if (TREE_CODE (type) == FUNCTION_TYPE)
6521 if (storage_class == csc_register || threadp)
6523 error_at (loc, "invalid storage class for function %qE", name);
6525 else if (current_scope != file_scope)
6527 /* Function declaration not at file scope. Storage
6528 classes other than `extern' are not allowed, C99
6529 6.7.1p5, and `extern' makes no difference. However,
6530 GCC allows 'auto', perhaps with 'inline', to support
6531 nested functions. */
6532 if (storage_class == csc_auto)
6533 pedwarn (loc, OPT_Wpedantic,
6534 "invalid storage class for function %qE", name);
6535 else if (storage_class == csc_static)
6537 error_at (loc, "invalid storage class for function %qE", name);
6539 storage_class = declspecs->storage_class = csc_none;
6545 decl = build_decl (declarator->id_loc,
6546 FUNCTION_DECL, declarator->u.id, type);
6547 decl = build_decl_attribute_variant (decl, decl_attr);
6549 if (type_quals & TYPE_QUAL_ATOMIC)
6552 "%<_Atomic%>-qualified function type");
6553 type_quals &= ~TYPE_QUAL_ATOMIC;
6555 else if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
6556 pedwarn (loc, OPT_Wpedantic,
6557 "ISO C forbids qualified function types");
6559 /* Every function declaration is an external reference
6560 (DECL_EXTERNAL) except for those which are not at file
6561 scope and are explicitly declared "auto". This is
6562 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6563 GCC to signify a forward declaration of a nested function. */
6564 if (storage_class == csc_auto && current_scope != file_scope)
6565 DECL_EXTERNAL (decl) = 0;
6566 /* In C99, a function which is declared 'inline' with 'extern'
6567 is not an external reference (which is confusing). It
6568 means that the later definition of the function must be output
6569 in this file, C99 6.7.4p6. In GNU C89, a function declared
6570 'extern inline' is an external reference. */
6571 else if (declspecs->inline_p && storage_class != csc_static)
6572 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
6573 == flag_gnu89_inline);
6575 DECL_EXTERNAL (decl) = !initialized;
6577 /* Record absence of global scope for `static' or `auto'. */
6579 = !(storage_class == csc_static || storage_class == csc_auto);
6581 /* For a function definition, record the argument information
6582 block where store_parm_decls will look for it. */
6584 current_function_arg_info = arg_info;
6586 if (declspecs->default_int_p)
6587 C_FUNCTION_IMPLICIT_INT (decl) = 1;
6589 /* Record presence of `inline' and `_Noreturn', if it is
6591 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
6593 if (declspecs->inline_p)
6594 pedwarn (loc, 0, "cannot inline function %<main%>");
6595 if (declspecs->noreturn_p)
6596 pedwarn (loc, 0, "%<main%> declared %<_Noreturn%>");
6600 if (declspecs->inline_p)
6601 /* Record that the function is declared `inline'. */
6602 DECL_DECLARED_INLINE_P (decl) = 1;
6603 if (declspecs->noreturn_p)
6606 pedwarn_c99 (loc, OPT_Wpedantic,
6607 "ISO C99 does not support %<_Noreturn%>");
6609 pedwarn_c99 (loc, OPT_Wpedantic,
6610 "ISO C90 does not support %<_Noreturn%>");
6611 TREE_THIS_VOLATILE (decl) = 1;
6617 /* It's a variable. */
6618 /* An uninitialized decl with `extern' is a reference. */
6619 int extern_ref = !initialized && storage_class == csc_extern;
6621 type = c_build_qualified_type (type, type_quals);
6623 /* C99 6.2.2p7: It is invalid (compile-time undefined
6624 behavior) to create an 'extern' declaration for a
6625 variable if there is a global declaration that is
6626 'static' and the global declaration is not visible.
6627 (If the static declaration _is_ currently visible,
6628 the 'extern' declaration is taken to refer to that decl.) */
6629 if (extern_ref && current_scope != file_scope)
6631 tree global_decl = identifier_global_value (declarator->u.id);
6632 tree visible_decl = lookup_name (declarator->u.id);
6635 && global_decl != visible_decl
6636 && VAR_P (global_decl)
6637 && !TREE_PUBLIC (global_decl))
6638 error_at (loc, "variable previously declared %<static%> "
6639 "redeclared %<extern%>");
6642 decl = build_decl (declarator->id_loc,
6643 VAR_DECL, declarator->u.id, type);
6645 C_DECL_VARIABLE_SIZE (decl) = 1;
6647 if (declspecs->inline_p)
6648 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
6649 if (declspecs->noreturn_p)
6650 pedwarn (loc, 0, "variable %q+D declared %<_Noreturn%>", decl);
6652 /* At file scope, an initialized extern declaration may follow
6653 a static declaration. In that case, DECL_EXTERNAL will be
6654 reset later in start_decl. */
6655 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
6657 /* At file scope, the presence of a `static' or `register' storage
6658 class specifier, or the absence of all storage class specifiers
6659 makes this declaration a definition (perhaps tentative). Also,
6660 the absence of `static' makes it public. */
6661 if (current_scope == file_scope)
6663 TREE_PUBLIC (decl) = storage_class != csc_static;
6664 TREE_STATIC (decl) = !extern_ref;
6666 /* Not at file scope, only `static' makes a static definition. */
6669 TREE_STATIC (decl) = (storage_class == csc_static);
6670 TREE_PUBLIC (decl) = extern_ref;
6674 set_decl_tls_model (decl, decl_default_tls_model (decl));
6677 if ((storage_class == csc_extern
6678 || (storage_class == csc_none
6679 && TREE_CODE (type) == FUNCTION_TYPE
6681 && variably_modified_type_p (type, NULL_TREE))
6684 if (TREE_CODE (type) == FUNCTION_TYPE)
6685 error_at (loc, "non-nested function with variably modified type");
6687 error_at (loc, "object with variably modified type must have "
6691 /* Record `register' declaration for warnings on &
6692 and in case doing stupid register allocation. */
6694 if (storage_class == csc_register)
6696 C_DECL_REGISTER (decl) = 1;
6697 DECL_REGISTER (decl) = 1;
6700 /* Record constancy and volatility. */
6701 c_apply_type_quals_to_decl (type_quals, decl);
6703 /* Apply _Alignas specifiers. */
6706 DECL_ALIGN (decl) = alignas_align * BITS_PER_UNIT;
6707 DECL_USER_ALIGN (decl) = 1;
6710 /* If a type has volatile components, it should be stored in memory.
6711 Otherwise, the fact that those components are volatile
6712 will be ignored, and would even crash the compiler.
6713 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6714 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
6715 && (VAR_P (decl) || TREE_CODE (decl) == PARM_DECL
6716 || TREE_CODE (decl) == RESULT_DECL))
6718 /* It is not an error for a structure with volatile fields to
6719 be declared register, but reset DECL_REGISTER since it
6720 cannot actually go in a register. */
6721 int was_reg = C_DECL_REGISTER (decl);
6722 C_DECL_REGISTER (decl) = 0;
6723 DECL_REGISTER (decl) = 0;
6724 c_mark_addressable (decl);
6725 C_DECL_REGISTER (decl) = was_reg;
6728 /* This is the earliest point at which we might know the assembler
6729 name of a variable. Thus, if it's known before this, die horribly. */
6730 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
6734 && TREE_PUBLIC (decl)
6735 && TREE_STATIC (decl)
6736 && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
6737 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
6738 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
6739 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
6740 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
6741 ("non-local variable %qD with anonymous type is "
6742 "questionable in C++"),
6749 /* Decode the parameter-list info for a function type or function definition.
6750 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6751 if there is an identifier list instead of a parameter decl list).
6752 These two functions are separate because when a function returns
6753 or receives functions then each is called multiple times but the order
6754 of calls is different. The last call to `grokparms' is always the one
6755 that contains the formal parameter names of a function definition.
6757 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6759 FUNCDEF_FLAG is true for a function definition, false for
6760 a mere declaration. A nonempty identifier-list gets an error message
6761 when FUNCDEF_FLAG is false. */
6764 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
6766 tree arg_types = arg_info->types;
6768 if (funcdef_flag && arg_info->had_vla_unspec)
6770 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6772 error ("%<[*]%> not allowed in other than function prototype scope");
6775 if (arg_types == 0 && !funcdef_flag
6776 && !in_system_header_at (input_location))
6777 warning (OPT_Wstrict_prototypes,
6778 "function declaration isn%'t a prototype");
6780 if (arg_types == error_mark_node)
6781 return 0; /* don't set TYPE_ARG_TYPES in this case */
6783 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
6787 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
6788 arg_info->parms = NULL_TREE;
6791 arg_info->parms = arg_info->types;
6793 arg_info->types = 0;
6798 tree parm, type, typelt;
6799 unsigned int parmno;
6802 /* If there is a parameter of incomplete type in a definition,
6803 this is an error. In a declaration this is valid, and a
6804 struct or union type may be completed later, before any calls
6805 or definition of the function. In the case where the tag was
6806 first declared within the parameter list, a warning has
6807 already been given. If a parameter has void type, then
6808 however the function cannot be defined or called, so
6811 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
6813 parm = DECL_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
6815 type = TREE_VALUE (typelt);
6816 if (type == error_mark_node)
6819 if (!COMPLETE_TYPE_P (type))
6823 if (DECL_NAME (parm))
6824 error_at (input_location,
6825 "parameter %u (%q+D) has incomplete type",
6828 error_at (DECL_SOURCE_LOCATION (parm),
6829 "parameter %u has incomplete type",
6832 TREE_VALUE (typelt) = error_mark_node;
6833 TREE_TYPE (parm) = error_mark_node;
6834 arg_types = NULL_TREE;
6836 else if (VOID_TYPE_P (type))
6838 if (DECL_NAME (parm))
6839 warning_at (input_location, 0,
6840 "parameter %u (%q+D) has void type",
6843 warning_at (DECL_SOURCE_LOCATION (parm), 0,
6844 "parameter %u has void type",
6849 errmsg = targetm.invalid_parameter_type (type);
6853 TREE_VALUE (typelt) = error_mark_node;
6854 TREE_TYPE (parm) = error_mark_node;
6855 arg_types = NULL_TREE;
6858 if (DECL_NAME (parm) && TREE_USED (parm))
6859 warn_if_shadowing (parm);
6865 /* Allocate and initialize a c_arg_info structure from the parser's
6869 build_arg_info (void)
6871 struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info);
6872 ret->parms = NULL_TREE;
6874 ret->types = NULL_TREE;
6875 ret->others = NULL_TREE;
6876 ret->pending_sizes = NULL;
6877 ret->had_vla_unspec = 0;
6881 /* Take apart the current scope and return a c_arg_info structure with
6882 info on a parameter list just parsed.
6884 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6886 ELLIPSIS being true means the argument list ended in '...' so don't
6887 append a sentinel (void_list_node) to the end of the type-list.
6889 EXPR is NULL or an expression that needs to be evaluated for the
6890 side effects of array size expressions in the parameters. */
6893 get_parm_info (bool ellipsis, tree expr)
6895 struct c_binding *b = current_scope->bindings;
6896 struct c_arg_info *arg_info = build_arg_info ();
6899 vec<c_arg_tag, va_gc> *tags = NULL;
6903 static bool explained_incomplete_types = false;
6904 bool gave_void_only_once_err = false;
6906 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
6908 /* The bindings in this scope must not get put into a block.
6909 We will take care of deleting the binding nodes. */
6910 current_scope->bindings = 0;
6912 /* This function is only called if there was *something* on the
6916 /* A parameter list consisting solely of 'void' indicates that the
6917 function takes no arguments. But if the 'void' is qualified
6918 (by 'const' or 'volatile'), or has a storage class specifier
6919 ('register'), then the behavior is undefined; issue an error.
6920 Typedefs for 'void' are OK (see DR#157). */
6921 if (b->prev == 0 /* one binding */
6922 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
6923 && !DECL_NAME (b->decl) /* anonymous */
6924 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
6926 if (TYPE_QUALS (TREE_TYPE (b->decl)) != TYPE_UNQUALIFIED
6927 || C_DECL_REGISTER (b->decl))
6928 error ("%<void%> as only parameter may not be qualified");
6930 /* There cannot be an ellipsis. */
6932 error ("%<void%> must be the only parameter");
6934 arg_info->types = void_list_node;
6939 types = void_list_node;
6941 /* Break up the bindings list into parms, tags, types, and others;
6942 apply sanity checks; purge the name-to-decl bindings. */
6945 tree decl = b->decl;
6946 tree type = TREE_TYPE (decl);
6948 const char *keyword;
6950 switch (TREE_CODE (decl))
6955 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6956 I_SYMBOL_BINDING (b->id) = b->shadowed;
6959 /* Check for forward decls that never got their actual decl. */
6960 if (TREE_ASM_WRITTEN (decl))
6961 error ("parameter %q+D has just a forward declaration", decl);
6962 /* Check for (..., void, ...) and issue an error. */
6963 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
6965 if (!gave_void_only_once_err)
6967 error ("%<void%> must be the only parameter");
6968 gave_void_only_once_err = true;
6973 /* Valid parameter, add it to the list. */
6974 DECL_CHAIN (decl) = parms;
6977 /* Since there is a prototype, args are passed in their
6978 declared types. The back end may override this later. */
6979 DECL_ARG_TYPE (decl) = type;
6980 types = tree_cons (0, type, types);
6984 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
6985 case UNION_TYPE: keyword = "union"; goto tag;
6986 case RECORD_TYPE: keyword = "struct"; goto tag;
6988 /* Types may not have tag-names, in which case the type
6989 appears in the bindings list with b->id NULL. */
6992 gcc_assert (I_TAG_BINDING (b->id) == b);
6993 I_TAG_BINDING (b->id) = b->shadowed;
6996 /* Warn about any struct, union or enum tags defined in a
6997 parameter list. The scope of such types is limited to
6998 the parameter list, which is rarely if ever desirable
6999 (it's impossible to call such a function with type-
7000 correct arguments). An anonymous union parm type is
7001 meaningful as a GNU extension, so don't warn for that. */
7002 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
7005 /* The %s will be one of 'struct', 'union', or 'enum'. */
7006 warning (0, "%<%s %E%> declared inside parameter list",
7009 /* The %s will be one of 'struct', 'union', or 'enum'. */
7010 warning (0, "anonymous %s declared inside parameter list",
7013 if (!explained_incomplete_types)
7015 warning (0, "its scope is only this definition or declaration,"
7016 " which is probably not what you want");
7017 explained_incomplete_types = true;
7023 vec_safe_push (tags, tag);
7029 /* CONST_DECLs appear here when we have an embedded enum,
7030 and TYPE_DECLs appear here when we have an embedded struct
7031 or union. No warnings for this - we already warned about the
7032 type itself. FUNCTION_DECLs appear when there is an implicit
7033 function declaration in the parameter list. */
7035 /* When we reinsert this decl in the function body, we need
7036 to reconstruct whether it was marked as nested. */
7037 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7040 DECL_CHAIN (decl) = others;
7045 /* error_mark_node appears here when we have an undeclared
7046 variable. Just throw it away. */
7049 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
7050 I_SYMBOL_BINDING (b->id) = b->shadowed;
7054 /* Other things that might be encountered. */
7061 b = free_binding_and_advance (b);
7064 arg_info->parms = parms;
7065 arg_info->tags = tags;
7066 arg_info->types = types;
7067 arg_info->others = others;
7068 arg_info->pending_sizes = expr;
7072 /* Get the struct, enum or union (CODE says which) with tag NAME.
7073 Define the tag as a forward-reference with location LOC if it is
7074 not defined. Return a c_typespec structure for the type
7078 parser_xref_tag (location_t loc, enum tree_code code, tree name)
7080 struct c_typespec ret;
7084 ret.expr = NULL_TREE;
7085 ret.expr_const_operands = true;
7087 /* If a cross reference is requested, look up the type
7088 already defined for this tag and return it. */
7090 ref = lookup_tag (code, name, 0, &refloc);
7091 /* If this is the right type of tag, return what we found.
7092 (This reference will be shadowed by shadow_tag later if appropriate.)
7093 If this is the wrong type of tag, do not return it. If it was the
7094 wrong type in the same scope, we will have had an error
7095 message already; if in a different scope and declaring
7096 a name, pending_xref_error will give an error message; but if in a
7097 different scope and not declaring a name, this tag should
7098 shadow the previous declaration of a different type of tag, and
7099 this would not work properly if we return the reference found.
7100 (For example, with "struct foo" in an outer scope, "union foo;"
7101 must shadow that tag with a new one of union type.) */
7102 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
7103 if (ref && TREE_CODE (ref) == code)
7105 if (C_TYPE_DEFINED_IN_STRUCT (ref)
7106 && loc != UNKNOWN_LOCATION
7112 warning_at (loc, OPT_Wc___compat,
7113 ("enum type defined in struct or union "
7114 "is not visible in C++"));
7115 inform (refloc, "enum type defined here");
7118 warning_at (loc, OPT_Wc___compat,
7119 ("struct defined in struct or union "
7120 "is not visible in C++"));
7121 inform (refloc, "struct defined here");
7124 warning_at (loc, OPT_Wc___compat,
7125 ("union defined in struct or union "
7126 "is not visible in C++"));
7127 inform (refloc, "union defined here");
7138 /* If no such tag is yet defined, create a forward-reference node
7139 and record it as the "definition".
7140 When a real declaration of this type is found,
7141 the forward-reference will be altered into a real type. */
7143 ref = make_node (code);
7144 if (code == ENUMERAL_TYPE)
7146 /* Give the type a default layout like unsigned int
7147 to avoid crashing if it does not get defined. */
7148 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
7149 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
7150 TYPE_USER_ALIGN (ref) = 0;
7151 TYPE_UNSIGNED (ref) = 1;
7152 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
7153 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
7154 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
7157 pushtag (loc, name, ref);
7163 /* Get the struct, enum or union (CODE says which) with tag NAME.
7164 Define the tag as a forward-reference if it is not defined.
7165 Return a tree for the type. */
7168 xref_tag (enum tree_code code, tree name)
7170 return parser_xref_tag (input_location, code, name).spec;
7173 /* Make sure that the tag NAME is defined *in the current scope*
7174 at least as a forward reference.
7175 LOC is the location of the struct's definition.
7176 CODE says which kind of tag NAME ought to be.
7178 This stores the current value of the file static STRUCT_PARSE_INFO
7179 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
7180 new c_struct_parse_info structure. The old value of
7181 STRUCT_PARSE_INFO is restored in finish_struct. */
7184 start_struct (location_t loc, enum tree_code code, tree name,
7185 struct c_struct_parse_info **enclosing_struct_parse_info)
7187 /* If there is already a tag defined at this scope
7188 (as a forward reference), just return it. */
7190 tree ref = NULL_TREE;
7191 location_t refloc = UNKNOWN_LOCATION;
7193 if (name != NULL_TREE)
7194 ref = lookup_tag (code, name, 1, &refloc);
7195 if (ref && TREE_CODE (ref) == code)
7197 if (TYPE_SIZE (ref))
7199 if (code == UNION_TYPE)
7200 error_at (loc, "redefinition of %<union %E%>", name);
7202 error_at (loc, "redefinition of %<struct %E%>", name);
7203 if (refloc != UNKNOWN_LOCATION)
7204 inform (refloc, "originally defined here");
7205 /* Don't create structures using a name already in use. */
7208 else if (C_TYPE_BEING_DEFINED (ref))
7210 if (code == UNION_TYPE)
7211 error_at (loc, "nested redefinition of %<union %E%>", name);
7213 error_at (loc, "nested redefinition of %<struct %E%>", name);
7214 /* Don't bother to report "originally defined here" for a
7215 nested redefinition; the original definition should be
7217 /* Don't create structures that contain themselves. */
7222 /* Otherwise create a forward-reference just so the tag is in scope. */
7224 if (ref == NULL_TREE || TREE_CODE (ref) != code)
7226 ref = make_node (code);
7227 pushtag (loc, name, ref);
7230 C_TYPE_BEING_DEFINED (ref) = 1;
7231 TYPE_PACKED (ref) = flag_pack_struct;
7233 *enclosing_struct_parse_info = struct_parse_info;
7234 struct_parse_info = XNEW (struct c_struct_parse_info);
7235 struct_parse_info->struct_types.create (0);
7236 struct_parse_info->fields.create (0);
7237 struct_parse_info->typedefs_seen.create (0);
7239 /* FIXME: This will issue a warning for a use of a type defined
7240 within a statement expr used within sizeof, et. al. This is not
7241 terribly serious as C++ doesn't permit statement exprs within
7243 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7244 warning_at (loc, OPT_Wc___compat,
7245 "defining type in %qs expression is invalid in C++",
7248 : (in_typeof ? "typeof" : "alignof")));
7253 /* Process the specs, declarator and width (NULL if omitted)
7254 of a structure component, returning a FIELD_DECL node.
7255 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
7256 DECL_ATTRS is as for grokdeclarator.
7258 LOC is the location of the structure component.
7260 This is done during the parsing of the struct declaration.
7261 The FIELD_DECL nodes are chained together and the lot of them
7262 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
7265 grokfield (location_t loc,
7266 struct c_declarator *declarator, struct c_declspecs *declspecs,
7267 tree width, tree *decl_attrs)
7271 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
7272 && width == NULL_TREE)
7274 /* This is an unnamed decl.
7276 If we have something of the form "union { list } ;" then this
7277 is the anonymous union extension. Similarly for struct.
7279 If this is something of the form "struct foo;", then
7280 If MS or Plan 9 extensions are enabled, this is handled as
7281 an anonymous struct.
7282 Otherwise this is a forward declaration of a structure tag.
7284 If this is something of the form "foo;" and foo is a TYPE_DECL, then
7285 If foo names a structure or union without a tag, then this
7286 is an anonymous struct (this is permitted by C11).
7287 If MS or Plan 9 extensions are enabled and foo names a
7288 structure, then again this is an anonymous struct.
7289 Otherwise this is an error.
7291 Oh what a horrid tangled web we weave. I wonder if MS consciously
7292 took this from Plan 9 or if it was an accident of implementation
7293 that took root before someone noticed the bug... */
7295 tree type = declspecs->type;
7296 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
7297 || TREE_CODE (type) == UNION_TYPE);
7301 && (flag_ms_extensions
7302 || flag_plan9_extensions
7303 || !declspecs->typedef_p))
7305 if (flag_ms_extensions || flag_plan9_extensions)
7307 else if (TYPE_NAME (type) == NULL)
7314 pedwarn (loc, 0, "declaration does not declare anything");
7318 pedwarn_c99 (loc, OPT_Wpedantic,
7319 "ISO C99 doesn%'t support unnamed structs/unions");
7321 pedwarn_c99 (loc, OPT_Wpedantic,
7322 "ISO C90 doesn%'t support unnamed structs/unions");
7325 value = grokdeclarator (declarator, declspecs, FIELD, false,
7326 width ? &width : NULL, decl_attrs, NULL, NULL,
7329 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
7330 DECL_INITIAL (value) = width;
7332 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
7334 /* If we currently have a binding for this field, set the
7335 in_struct field in the binding, so that we warn about lookups
7337 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
7340 /* If the in_struct field is not yet set, push it on a list
7341 to be cleared when this struct is finished. */
7344 struct_parse_info->fields.safe_push (b);
7353 /* Subroutine of detect_field_duplicates: return whether X and Y,
7354 which are both fields in the same struct, have duplicate field
7358 is_duplicate_field (tree x, tree y)
7360 if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y))
7363 /* When using -fplan9-extensions, an anonymous field whose name is a
7364 typedef can duplicate a field name. */
7365 if (flag_plan9_extensions
7366 && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE))
7368 tree xt, xn, yt, yn;
7371 if (DECL_NAME (x) != NULL_TREE)
7373 else if ((TREE_CODE (xt) == RECORD_TYPE || TREE_CODE (xt) == UNION_TYPE)
7374 && TYPE_NAME (xt) != NULL_TREE
7375 && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL)
7376 xn = DECL_NAME (TYPE_NAME (xt));
7381 if (DECL_NAME (y) != NULL_TREE)
7383 else if ((TREE_CODE (yt) == RECORD_TYPE || TREE_CODE (yt) == UNION_TYPE)
7384 && TYPE_NAME (yt) != NULL_TREE
7385 && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL)
7386 yn = DECL_NAME (TYPE_NAME (yt));
7390 if (xn != NULL_TREE && xn == yn)
7397 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7398 to HTAB, giving errors for any duplicates. */
7401 detect_field_duplicates_hash (tree fieldlist,
7402 hash_table<pointer_hash <tree_node> > *htab)
7407 for (x = fieldlist; x ; x = DECL_CHAIN (x))
7408 if ((y = DECL_NAME (x)) != 0)
7410 slot = htab->find_slot (y, INSERT);
7413 error ("duplicate member %q+D", x);
7414 DECL_NAME (x) = NULL_TREE;
7418 else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7419 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7421 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab);
7423 /* When using -fplan9-extensions, an anonymous field whose
7424 name is a typedef can duplicate a field name. */
7425 if (flag_plan9_extensions
7426 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
7427 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)
7429 tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x)));
7430 slot = htab->find_slot (xn, INSERT);
7432 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x)));
7438 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7439 the list such that this does not present a problem later. */
7442 detect_field_duplicates (tree fieldlist)
7447 /* If the struct is the list of instance variables of an Objective-C
7448 class, then we need to check all the instance variables of
7449 superclasses when checking for duplicates (since you can't have
7450 an instance variable in a subclass with the same name as an
7451 instance variable in a superclass). We pass on this job to the
7452 Objective-C compiler. objc_detect_field_duplicates() will return
7453 false if we are not checking the list of instance variables and
7454 the C frontend should proceed with the standard field duplicate
7455 checks. If we are checking the list of instance variables, the
7456 ObjC frontend will do the check, emit the errors if needed, and
7457 then return true. */
7458 if (c_dialect_objc ())
7459 if (objc_detect_field_duplicates (false))
7462 /* First, see if there are more than "a few" fields.
7463 This is trivially true if there are zero or one fields. */
7464 if (!fieldlist || !DECL_CHAIN (fieldlist))
7469 if (DECL_NAME (x) == NULL_TREE
7470 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7471 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7474 } while (timeout > 0 && x);
7476 /* If there were "few" fields and no anonymous structures or unions,
7477 avoid the overhead of allocating a hash table. Instead just do
7478 the nested traversal thing. */
7481 for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x))
7482 /* When using -fplan9-extensions, we can have duplicates
7483 between typedef names and fields. */
7485 || (flag_plan9_extensions
7486 && DECL_NAME (x) == NULL_TREE
7487 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7488 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7489 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
7490 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL))
7492 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
7493 if (is_duplicate_field (y, x))
7495 error ("duplicate member %q+D", x);
7496 DECL_NAME (x) = NULL_TREE;
7502 hash_table<pointer_hash <tree_node> > htab (37);
7503 detect_field_duplicates_hash (fieldlist, &htab);
7507 /* Finish up struct info used by -Wc++-compat. */
7510 warn_cxx_compat_finish_struct (tree fieldlist, enum tree_code code,
7511 location_t record_loc)
7515 struct c_binding *b;
7517 if (fieldlist == NULL_TREE)
7519 if (code == RECORD_TYPE)
7520 warning_at (record_loc, OPT_Wc___compat,
7521 "empty struct has size 0 in C, size 1 in C++");
7523 warning_at (record_loc, OPT_Wc___compat,
7524 "empty union has size 0 in C, size 1 in C++");
7527 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7528 the current struct. We do this now at the end of the struct
7529 because the flag is used to issue visibility warnings, and we
7530 only want to issue those warnings if the type is referenced
7531 outside of the struct declaration. */
7532 FOR_EACH_VEC_ELT (struct_parse_info->struct_types, ix, x)
7533 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
7535 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7536 typedefs used when declaring fields in this struct. If the name
7537 of any of the fields is also a typedef name then the struct would
7538 not parse in C++, because the C++ lookup rules say that the
7539 typedef name would be looked up in the context of the struct, and
7540 would thus be the field rather than the typedef. */
7541 if (!struct_parse_info->typedefs_seen.is_empty ()
7542 && fieldlist != NULL_TREE)
7544 /* Use a hash_set<tree> using the name of the typedef. We can use
7545 a hash_set<tree> because identifiers are interned. */
7546 hash_set<tree> tset;
7548 FOR_EACH_VEC_ELT (struct_parse_info->typedefs_seen, ix, x)
7549 tset.add (DECL_NAME (x));
7551 for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x))
7553 if (DECL_NAME (x) != NULL_TREE
7554 && tset.contains (DECL_NAME (x)))
7556 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
7557 ("using %qD as both field and typedef name is "
7560 /* FIXME: It would be nice to report the location where
7561 the typedef name is used. */
7566 /* For each field which has a binding and which was not defined in
7567 an enclosing struct, clear the in_struct field. */
7568 FOR_EACH_VEC_ELT (struct_parse_info->fields, ix, b)
7572 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7573 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7574 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7575 ATTRIBUTES are attributes to be applied to the structure.
7577 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7578 the struct was started. */
7581 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
7582 struct c_struct_parse_info *enclosing_struct_parse_info)
7585 bool toplevel = file_scope == current_scope;
7586 int saw_named_field;
7588 /* If this type was previously laid out as a forward reference,
7589 make sure we lay it out again. */
7593 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7597 for (x = fieldlist; x; x = DECL_CHAIN (x))
7599 if (DECL_NAME (x) != 0)
7602 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7603 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7609 if (TREE_CODE (t) == UNION_TYPE)
7612 pedwarn (loc, OPT_Wpedantic, "union has no named members");
7614 pedwarn (loc, OPT_Wpedantic, "union has no members");
7619 pedwarn (loc, OPT_Wpedantic, "struct has no named members");
7621 pedwarn (loc, OPT_Wpedantic, "struct has no members");
7626 /* Install struct as DECL_CONTEXT of each field decl.
7627 Also process specified field sizes, found in the DECL_INITIAL,
7628 storing 0 there after the type has been changed to precision equal
7629 to its width, rather than the precision of the specified standard
7630 type. (Correct layout requires the original type to have been preserved
7633 saw_named_field = 0;
7634 for (x = fieldlist; x; x = DECL_CHAIN (x))
7636 if (TREE_TYPE (x) == error_mark_node)
7639 DECL_CONTEXT (x) = t;
7641 /* If any field is const, the structure type is pseudo-const. */
7642 if (TREE_READONLY (x))
7643 C_TYPE_FIELDS_READONLY (t) = 1;
7646 /* A field that is pseudo-const makes the structure likewise. */
7647 tree t1 = strip_array_types (TREE_TYPE (x));
7648 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
7649 && C_TYPE_FIELDS_READONLY (t1))
7650 C_TYPE_FIELDS_READONLY (t) = 1;
7653 /* Any field that is volatile means variables of this type must be
7654 treated in some ways as volatile. */
7655 if (TREE_THIS_VOLATILE (x))
7656 C_TYPE_FIELDS_VOLATILE (t) = 1;
7658 /* Any field of nominal variable size implies structure is too. */
7659 if (C_DECL_VARIABLE_SIZE (x))
7660 C_TYPE_VARIABLE_SIZE (t) = 1;
7662 if (DECL_INITIAL (x))
7664 unsigned HOST_WIDE_INT width = tree_to_uhwi (DECL_INITIAL (x));
7665 DECL_SIZE (x) = bitsize_int (width);
7666 DECL_BIT_FIELD (x) = 1;
7667 SET_DECL_C_BIT_FIELD (x);
7671 && (DECL_BIT_FIELD (x)
7672 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
7673 DECL_PACKED (x) = 1;
7675 /* Detect flexible array member in an invalid context. */
7676 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
7677 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
7678 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
7679 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
7681 if (TREE_CODE (t) == UNION_TYPE)
7683 error_at (DECL_SOURCE_LOCATION (x),
7684 "flexible array member in union");
7685 TREE_TYPE (x) = error_mark_node;
7687 else if (DECL_CHAIN (x) != NULL_TREE)
7689 error_at (DECL_SOURCE_LOCATION (x),
7690 "flexible array member not at end of struct");
7691 TREE_TYPE (x) = error_mark_node;
7693 else if (!saw_named_field)
7695 error_at (DECL_SOURCE_LOCATION (x),
7696 "flexible array member in otherwise empty struct");
7697 TREE_TYPE (x) = error_mark_node;
7701 if (pedantic && TREE_CODE (t) == RECORD_TYPE
7702 && flexible_array_type_p (TREE_TYPE (x)))
7703 pedwarn (DECL_SOURCE_LOCATION (x), OPT_Wpedantic,
7704 "invalid use of structure with flexible array member");
7707 || TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7708 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7709 saw_named_field = 1;
7712 detect_field_duplicates (fieldlist);
7714 /* Now we have the nearly final fieldlist. Record it,
7715 then lay out the structure or union (including the fields). */
7717 TYPE_FIELDS (t) = fieldlist;
7721 if (TYPE_SIZE_UNIT (t)
7722 && TREE_CODE (TYPE_SIZE_UNIT (t)) == INTEGER_CST
7723 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t))
7724 && !valid_constant_size_p (TYPE_SIZE_UNIT (t)))
7725 error ("type %qT is too large", t);
7727 /* Give bit-fields their proper types. */
7729 tree *fieldlistp = &fieldlist;
7731 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
7732 && TREE_TYPE (*fieldlistp) != error_mark_node)
7734 unsigned HOST_WIDE_INT width
7735 = tree_to_uhwi (DECL_INITIAL (*fieldlistp));
7736 tree type = TREE_TYPE (*fieldlistp);
7737 if (width != TYPE_PRECISION (type))
7739 TREE_TYPE (*fieldlistp)
7740 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
7741 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
7743 DECL_INITIAL (*fieldlistp) = 0;
7746 fieldlistp = &DECL_CHAIN (*fieldlistp);
7749 /* Now we have the truly final field list.
7750 Store it in this type and in the variants. */
7752 TYPE_FIELDS (t) = fieldlist;
7754 /* If there are lots of fields, sort so we can look through them fast.
7755 We arbitrarily consider 16 or more elts to be "a lot". */
7760 for (x = fieldlist; x; x = DECL_CHAIN (x))
7762 if (len > 15 || DECL_NAME (x) == NULL)
7770 struct lang_type *space;
7771 struct sorted_fields_type *space2;
7773 len += list_length (x);
7775 /* Use the same allocation policy here that make_node uses, to
7776 ensure that this lives as long as the rest of the struct decl.
7777 All decls in an inline function need to be saved. */
7779 space = ggc_cleared_alloc<struct lang_type> ();
7780 space2 = (sorted_fields_type *) ggc_internal_alloc
7781 (sizeof (struct sorted_fields_type) + len * sizeof (tree));
7785 field_array = &space2->elts[0];
7786 for (x = fieldlist; x; x = DECL_CHAIN (x))
7788 field_array[len++] = x;
7790 /* If there is anonymous struct or union, break out of the loop. */
7791 if (DECL_NAME (x) == NULL)
7794 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7797 TYPE_LANG_SPECIFIC (t) = space;
7798 TYPE_LANG_SPECIFIC (t)->s->len = len;
7799 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
7800 qsort (field_array, len, sizeof (tree), field_decl_cmp);
7805 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
7807 TYPE_FIELDS (x) = TYPE_FIELDS (t);
7808 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
7809 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
7810 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
7811 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
7814 /* If this was supposed to be a transparent union, but we can't
7815 make it one, warn and turn off the flag. */
7816 if (TREE_CODE (t) == UNION_TYPE
7817 && TYPE_TRANSPARENT_AGGR (t)
7818 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
7820 TYPE_TRANSPARENT_AGGR (t) = 0;
7821 warning_at (loc, 0, "union cannot be made transparent");
7824 /* If this structure or union completes the type of any previous
7825 variable declaration, lay it out and output its rtl.
7827 Note: C_TYPE_INCOMPLETE_VARS overloads TYPE_VFIELD which is used
7828 in dwarf2out via rest_of_decl_compilation below and means
7829 something totally different. Since we will be clearing
7830 C_TYPE_INCOMPLETE_VARS shortly after we iterate through them,
7831 clear it ahead of time and avoid problems in dwarf2out. Ideally,
7832 C_TYPE_INCOMPLETE_VARS should use some language specific
7834 tree incomplete_vars = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
7835 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
7836 for (x = incomplete_vars; x; x = TREE_CHAIN (x))
7838 tree decl = TREE_VALUE (x);
7839 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
7840 layout_array_type (TREE_TYPE (decl));
7841 if (TREE_CODE (decl) != TYPE_DECL)
7843 layout_decl (decl, 0);
7844 if (c_dialect_objc ())
7845 objc_check_decl (decl);
7846 rest_of_decl_compilation (decl, toplevel, 0);
7850 /* Update type location to the one of the definition, instead of e.g.
7851 a forward declaration. */
7852 if (TYPE_STUB_DECL (t))
7853 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
7855 /* Finish debugging output for this type. */
7856 rest_of_type_compilation (t, toplevel);
7858 /* If we're inside a function proper, i.e. not file-scope and not still
7859 parsing parameters, then arrange for the size of a variable sized type
7861 if (building_stmt_list_p () && variably_modified_type_p (t, NULL_TREE))
7862 add_stmt (build_stmt (loc,
7863 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
7865 if (warn_cxx_compat)
7866 warn_cxx_compat_finish_struct (fieldlist, TREE_CODE (t), loc);
7868 struct_parse_info->struct_types.release ();
7869 struct_parse_info->fields.release ();
7870 struct_parse_info->typedefs_seen.release ();
7871 XDELETE (struct_parse_info);
7873 struct_parse_info = enclosing_struct_parse_info;
7875 /* If this struct is defined inside a struct, add it to
7878 && struct_parse_info != NULL
7879 && !in_sizeof && !in_typeof && !in_alignof)
7880 struct_parse_info->struct_types.safe_push (t);
7885 /* Lay out the type T, and its element type, and so on. */
7888 layout_array_type (tree t)
7890 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
7891 layout_array_type (TREE_TYPE (t));
7895 /* Begin compiling the definition of an enumeration type.
7896 NAME is its name (or null if anonymous).
7897 LOC is the enum's location.
7898 Returns the type object, as yet incomplete.
7899 Also records info about it so that build_enumerator
7900 may be used to declare the individual values as they are read. */
7903 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
7905 tree enumtype = NULL_TREE;
7906 location_t enumloc = UNKNOWN_LOCATION;
7908 /* If this is the real definition for a previous forward reference,
7909 fill in the contents in the same object that used to be the
7910 forward reference. */
7912 if (name != NULL_TREE)
7913 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc);
7915 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
7917 enumtype = make_node (ENUMERAL_TYPE);
7918 pushtag (loc, name, enumtype);
7921 if (C_TYPE_BEING_DEFINED (enumtype))
7922 error_at (loc, "nested redefinition of %<enum %E%>", name);
7924 C_TYPE_BEING_DEFINED (enumtype) = 1;
7926 if (TYPE_VALUES (enumtype) != 0)
7928 /* This enum is a named one that has been declared already. */
7929 error_at (loc, "redeclaration of %<enum %E%>", name);
7930 if (enumloc != UNKNOWN_LOCATION)
7931 inform (enumloc, "originally defined here");
7933 /* Completely replace its old definition.
7934 The old enumerators remain defined, however. */
7935 TYPE_VALUES (enumtype) = 0;
7938 the_enum->enum_next_value = integer_zero_node;
7939 the_enum->enum_overflow = 0;
7941 if (flag_short_enums)
7942 for (tree v = TYPE_MAIN_VARIANT (enumtype); v; v = TYPE_NEXT_VARIANT (v))
7943 TYPE_PACKED (v) = 1;
7945 /* FIXME: This will issue a warning for a use of a type defined
7946 within sizeof in a statement expr. This is not terribly serious
7947 as C++ doesn't permit statement exprs within sizeof anyhow. */
7948 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7949 warning_at (loc, OPT_Wc___compat,
7950 "defining type in %qs expression is invalid in C++",
7953 : (in_typeof ? "typeof" : "alignof")));
7958 /* After processing and defining all the values of an enumeration type,
7959 install their decls in the enumeration type and finish it off.
7960 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7961 and ATTRIBUTES are the specified attributes.
7962 Returns ENUMTYPE. */
7965 finish_enum (tree enumtype, tree values, tree attributes)
7968 tree minnode = 0, maxnode = 0;
7971 bool toplevel = (file_scope == current_scope);
7972 struct lang_type *lt;
7974 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7976 /* Calculate the maximum value of any enumerator in this type. */
7978 if (values == error_mark_node)
7979 minnode = maxnode = integer_zero_node;
7982 minnode = maxnode = TREE_VALUE (values);
7983 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
7985 tree value = TREE_VALUE (pair);
7986 if (tree_int_cst_lt (maxnode, value))
7988 if (tree_int_cst_lt (value, minnode))
7993 /* Construct the final type of this enumeration. It is the same
7994 as one of the integral types - the narrowest one that fits, except
7995 that normally we only go as narrow as int - and signed iff any of
7996 the values are negative. */
7997 sign = (tree_int_cst_sgn (minnode) >= 0) ? UNSIGNED : SIGNED;
7998 precision = MAX (tree_int_cst_min_precision (minnode, sign),
7999 tree_int_cst_min_precision (maxnode, sign));
8001 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
8003 tem = c_common_type_for_size (precision, sign == UNSIGNED ? 1 : 0);
8006 warning (0, "enumeration values exceed range of largest integer");
8007 tem = long_long_integer_type_node;
8011 tem = sign == UNSIGNED ? unsigned_type_node : integer_type_node;
8013 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
8014 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
8015 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
8016 TYPE_ALIGN (enumtype) = TYPE_ALIGN (tem);
8017 TYPE_SIZE (enumtype) = 0;
8019 /* If the precision of the type was specified with an attribute and it
8020 was too small, give an error. Otherwise, use it. */
8021 if (TYPE_PRECISION (enumtype)
8022 && lookup_attribute ("mode", attributes))
8024 if (precision > TYPE_PRECISION (enumtype))
8025 error ("specified mode too small for enumeral values");
8028 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
8030 layout_type (enumtype);
8032 if (values != error_mark_node)
8034 /* Change the type of the enumerators to be the enum type. We
8035 need to do this irrespective of the size of the enum, for
8036 proper type checking. Replace the DECL_INITIALs of the
8037 enumerators, and the value slots of the list, with copies
8038 that have the enum type; they cannot be modified in place
8039 because they may be shared (e.g. integer_zero_node) Finally,
8040 change the purpose slots to point to the names of the decls. */
8041 for (pair = values; pair; pair = TREE_CHAIN (pair))
8043 tree enu = TREE_PURPOSE (pair);
8044 tree ini = DECL_INITIAL (enu);
8046 TREE_TYPE (enu) = enumtype;
8048 /* The ISO C Standard mandates enumerators to have type int,
8049 even though the underlying type of an enum type is
8050 unspecified. However, GCC allows enumerators of any
8051 integer type as an extensions. build_enumerator()
8052 converts any enumerators that fit in an int to type int,
8053 to avoid promotions to unsigned types when comparing
8054 integers with enumerators that fit in the int range.
8055 When -pedantic is given, build_enumerator() would have
8056 already warned about those that don't fit. Here we
8057 convert the rest to the enumerator type. */
8058 if (TREE_TYPE (ini) != integer_type_node)
8059 ini = convert (enumtype, ini);
8061 DECL_INITIAL (enu) = ini;
8062 TREE_PURPOSE (pair) = DECL_NAME (enu);
8063 TREE_VALUE (pair) = ini;
8066 TYPE_VALUES (enumtype) = values;
8069 /* Record the min/max values so that we can warn about bit-field
8070 enumerations that are too small for the values. */
8071 lt = ggc_cleared_alloc<struct lang_type> ();
8072 lt->enum_min = minnode;
8073 lt->enum_max = maxnode;
8074 TYPE_LANG_SPECIFIC (enumtype) = lt;
8076 /* Fix up all variant types of this enum type. */
8077 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
8079 if (tem == enumtype)
8081 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
8082 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
8083 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
8084 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
8085 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
8086 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
8087 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
8088 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
8089 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
8090 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
8091 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
8094 /* Finish debugging output for this type. */
8095 rest_of_type_compilation (enumtype, toplevel);
8097 /* If this enum is defined inside a struct, add it to
8100 && struct_parse_info != NULL
8101 && !in_sizeof && !in_typeof && !in_alignof)
8102 struct_parse_info->struct_types.safe_push (enumtype);
8107 /* Build and install a CONST_DECL for one value of the
8108 current enumeration type (one that was begun with start_enum).
8109 DECL_LOC is the location of the enumerator.
8110 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
8111 Return a tree-list containing the CONST_DECL and its value.
8112 Assignment of sequential values by default is handled here. */
8115 build_enumerator (location_t decl_loc, location_t loc,
8116 struct c_enum_contents *the_enum, tree name, tree value)
8120 /* Validate and default VALUE. */
8124 /* Don't issue more errors for error_mark_node (i.e. an
8125 undeclared identifier) - just ignore the value expression. */
8126 if (value == error_mark_node)
8128 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
8130 error_at (loc, "enumerator value for %qE is not an integer constant",
8136 if (TREE_CODE (value) != INTEGER_CST)
8138 value = c_fully_fold (value, false, NULL);
8139 if (TREE_CODE (value) == INTEGER_CST)
8140 pedwarn (loc, OPT_Wpedantic,
8141 "enumerator value for %qE is not an integer "
8142 "constant expression", name);
8144 if (TREE_CODE (value) != INTEGER_CST)
8146 error ("enumerator value for %qE is not an integer constant",
8152 value = default_conversion (value);
8153 constant_expression_warning (value);
8158 /* Default based on previous value. */
8159 /* It should no longer be possible to have NON_LVALUE_EXPR
8163 value = the_enum->enum_next_value;
8164 if (the_enum->enum_overflow)
8165 error_at (loc, "overflow in enumeration values");
8167 /* Even though the underlying type of an enum is unspecified, the
8168 type of enumeration constants is explicitly defined as int
8169 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
8171 else if (!int_fits_type_p (value, integer_type_node))
8172 pedwarn (loc, OPT_Wpedantic,
8173 "ISO C restricts enumerator values to range of %<int%>");
8175 /* The ISO C Standard mandates enumerators to have type int, even
8176 though the underlying type of an enum type is unspecified.
8177 However, GCC allows enumerators of any integer type as an
8178 extensions. Here we convert any enumerators that fit in an int
8179 to type int, to avoid promotions to unsigned types when comparing
8180 integers with enumerators that fit in the int range. When
8181 -pedantic is given, we would have already warned about those that
8182 don't fit. We have to do this here rather than in finish_enum
8183 because this value may be used to define more enumerators. */
8184 if (int_fits_type_p (value, integer_type_node))
8185 value = convert (integer_type_node, value);
8187 /* Set basis for default for next value. */
8188 the_enum->enum_next_value
8189 = build_binary_op (EXPR_LOC_OR_LOC (value, input_location),
8190 PLUS_EXPR, value, integer_one_node, 0);
8191 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
8193 /* Now create a declaration for the enum value name. */
8195 type = TREE_TYPE (value);
8196 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
8197 TYPE_PRECISION (integer_type_node)),
8198 (TYPE_PRECISION (type)
8199 >= TYPE_PRECISION (integer_type_node)
8200 && TYPE_UNSIGNED (type)));
8202 decl = build_decl (decl_loc, CONST_DECL, name, type);
8203 DECL_INITIAL (decl) = convert (type, value);
8206 return tree_cons (decl, value, NULL_TREE);
8210 /* Create the FUNCTION_DECL for a function definition.
8211 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
8212 the declaration; they describe the function's name and the type it returns,
8213 but twisted together in a fashion that parallels the syntax of C.
8215 This function creates a binding context for the function body
8216 as well as setting up the FUNCTION_DECL in current_function_decl.
8218 Returns 1 on success. If the DECLARATOR is not suitable for a function
8219 (it defines a datum instead), we return 0, which tells
8220 yyparse to report a parse error. */
8223 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
8226 tree decl1, old_decl;
8227 tree restype, resdecl;
8230 current_function_returns_value = 0; /* Assume, until we see it does. */
8231 current_function_returns_null = 0;
8232 current_function_returns_abnormally = 0;
8233 warn_about_return_type = 0;
8234 c_switch_stack = NULL;
8236 /* Indicate no valid break/continue context by setting these variables
8237 to some non-null, non-label value. We'll notice and emit the proper
8238 error message in c_finish_bc_stmt. */
8239 c_break_label = c_cont_label = size_zero_node;
8241 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
8242 &attributes, NULL, NULL, DEPRECATED_NORMAL);
8243 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION, decl1);
8245 /* If the declarator is not suitable for a function definition,
8246 cause a syntax error. */
8248 || TREE_CODE (decl1) != FUNCTION_DECL)
8251 loc = DECL_SOURCE_LOCATION (decl1);
8253 c_decl_attributes (&decl1, attributes, 0);
8255 if (DECL_DECLARED_INLINE_P (decl1)
8256 && DECL_UNINLINABLE (decl1)
8257 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
8258 warning_at (loc, OPT_Wattributes,
8259 "inline function %qD given attribute noinline",
8262 /* Handle gnu_inline attribute. */
8263 if (declspecs->inline_p
8264 && !flag_gnu89_inline
8265 && TREE_CODE (decl1) == FUNCTION_DECL
8266 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
8267 || current_function_decl))
8269 if (declspecs->storage_class != csc_static)
8270 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
8273 announce_function (decl1);
8275 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
8277 error_at (loc, "return type is an incomplete type");
8278 /* Make it return void instead. */
8280 = build_function_type (void_type_node,
8281 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
8284 if (warn_about_return_type)
8285 warn_defaults_to (loc, flag_isoc99 ? OPT_Wimplicit_int
8286 : (warn_return_type ? OPT_Wreturn_type
8287 : OPT_Wimplicit_int),
8288 "return type defaults to %<int%>");
8290 /* Make the init_value nonzero so pushdecl knows this is not tentative.
8291 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
8292 DECL_INITIAL (decl1) = error_mark_node;
8294 /* A nested function is not global. */
8295 if (current_function_decl != 0)
8296 TREE_PUBLIC (decl1) = 0;
8298 /* If this definition isn't a prototype and we had a prototype declaration
8299 before, copy the arg type info from that prototype. */
8300 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
8301 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
8303 current_function_prototype_locus = UNKNOWN_LOCATION;
8304 current_function_prototype_built_in = false;
8305 current_function_prototype_arg_types = NULL_TREE;
8306 if (!prototype_p (TREE_TYPE (decl1)))
8308 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
8309 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
8310 TREE_TYPE (TREE_TYPE (old_decl))))
8312 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
8314 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
8315 current_function_prototype_built_in
8316 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
8317 current_function_prototype_arg_types
8318 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
8320 if (TREE_PUBLIC (decl1))
8322 /* If there is an external prototype declaration of this
8323 function, record its location but do not copy information
8324 to this decl. This may be an invisible declaration
8325 (built-in or in a scope which has finished) or simply
8326 have more refined argument types than any declaration
8328 struct c_binding *b;
8329 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
8330 if (B_IN_SCOPE (b, external_scope))
8334 tree ext_decl, ext_type;
8336 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
8337 if (TREE_CODE (ext_type) == FUNCTION_TYPE
8338 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
8339 TREE_TYPE (ext_type)))
8341 current_function_prototype_locus
8342 = DECL_SOURCE_LOCATION (ext_decl);
8343 current_function_prototype_built_in
8344 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
8345 current_function_prototype_arg_types
8346 = TYPE_ARG_TYPES (ext_type);
8352 /* Optionally warn of old-fashioned def with no previous prototype. */
8353 if (warn_strict_prototypes
8354 && old_decl != error_mark_node
8355 && !prototype_p (TREE_TYPE (decl1))
8356 && C_DECL_ISNT_PROTOTYPE (old_decl))
8357 warning_at (loc, OPT_Wstrict_prototypes,
8358 "function declaration isn%'t a prototype");
8359 /* Optionally warn of any global def with no previous prototype. */
8360 else if (warn_missing_prototypes
8361 && old_decl != error_mark_node
8362 && TREE_PUBLIC (decl1)
8363 && !MAIN_NAME_P (DECL_NAME (decl1))
8364 && C_DECL_ISNT_PROTOTYPE (old_decl)
8365 && !DECL_DECLARED_INLINE_P (decl1))
8366 warning_at (loc, OPT_Wmissing_prototypes,
8367 "no previous prototype for %qD", decl1);
8368 /* Optionally warn of any def with no previous prototype
8369 if the function has already been used. */
8370 else if (warn_missing_prototypes
8372 && old_decl != error_mark_node
8373 && TREE_USED (old_decl)
8374 && !prototype_p (TREE_TYPE (old_decl)))
8375 warning_at (loc, OPT_Wmissing_prototypes,
8376 "%qD was used with no prototype before its definition", decl1);
8377 /* Optionally warn of any global def with no previous declaration. */
8378 else if (warn_missing_declarations
8379 && TREE_PUBLIC (decl1)
8381 && !MAIN_NAME_P (DECL_NAME (decl1))
8382 && !DECL_DECLARED_INLINE_P (decl1))
8383 warning_at (loc, OPT_Wmissing_declarations,
8384 "no previous declaration for %qD",
8386 /* Optionally warn of any def with no previous declaration
8387 if the function has already been used. */
8388 else if (warn_missing_declarations
8390 && old_decl != error_mark_node
8391 && TREE_USED (old_decl)
8392 && C_DECL_IMPLICIT (old_decl))
8393 warning_at (loc, OPT_Wmissing_declarations,
8394 "%qD was used with no declaration before its definition", decl1);
8396 /* This function exists in static storage.
8397 (This does not mean `static' in the C sense!) */
8398 TREE_STATIC (decl1) = 1;
8400 /* This is the earliest point at which we might know the assembler
8401 name of the function. Thus, if it's set before this, die horribly. */
8402 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
8404 /* If #pragma weak was used, mark the decl weak now. */
8405 if (current_scope == file_scope)
8406 maybe_apply_pragma_weak (decl1);
8408 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8409 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
8411 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
8412 != integer_type_node)
8413 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
8414 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1))))
8415 pedwarn (loc, OPT_Wmain, "%<_Atomic%>-qualified return type of %qD",
8418 check_main_parameter_types (decl1);
8420 if (!TREE_PUBLIC (decl1))
8421 pedwarn (loc, OPT_Wmain,
8422 "%qD is normally a non-static function", decl1);
8425 /* Record the decl so that the function name is defined.
8426 If we already have a decl for this name, and it is a FUNCTION_DECL,
8427 use the old decl. */
8429 current_function_decl = pushdecl (decl1);
8432 declare_parm_level ();
8434 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
8435 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
8436 DECL_ARTIFICIAL (resdecl) = 1;
8437 DECL_IGNORED_P (resdecl) = 1;
8438 DECL_RESULT (current_function_decl) = resdecl;
8440 start_fname_decls ();
8445 /* Subroutine of store_parm_decls which handles new-style function
8446 definitions (prototype format). The parms already have decls, so we
8447 need only record them as in effect and complain if any redundant
8448 old-style parm decls were written. */
8450 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
8456 if (current_scope->bindings)
8458 error_at (DECL_SOURCE_LOCATION (fndecl),
8459 "old-style parameter declarations in prototyped "
8460 "function definition");
8462 /* Get rid of the old-style declarations. */
8466 /* Don't issue this warning for nested functions, and don't issue this
8467 warning if we got here because ARG_INFO_TYPES was error_mark_node
8468 (this happens when a function definition has just an ellipsis in
8469 its parameter list). */
8470 else if (!in_system_header_at (input_location)
8471 && !current_function_scope
8472 && arg_info->types != error_mark_node)
8473 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
8474 "traditional C rejects ISO C style function definitions");
8476 /* Now make all the parameter declarations visible in the function body.
8477 We can bypass most of the grunt work of pushdecl. */
8478 for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl))
8480 DECL_CONTEXT (decl) = current_function_decl;
8481 if (DECL_NAME (decl))
8483 bind (DECL_NAME (decl), decl, current_scope,
8484 /*invisible=*/false, /*nested=*/false,
8486 if (!TREE_USED (decl))
8487 warn_if_shadowing (decl);
8490 error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted");
8493 /* Record the parameter list in the function declaration. */
8494 DECL_ARGUMENTS (fndecl) = arg_info->parms;
8496 /* Now make all the ancillary declarations visible, likewise. */
8497 for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl))
8499 DECL_CONTEXT (decl) = current_function_decl;
8500 if (DECL_NAME (decl))
8501 bind (DECL_NAME (decl), decl, current_scope,
8502 /*invisible=*/false,
8503 /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL),
8507 /* And all the tag declarations. */
8508 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
8510 bind (tag->id, tag->type, current_scope,
8511 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
8514 /* Subroutine of store_parm_decls which handles old-style function
8515 definitions (separate parameter list and declarations). */
8518 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
8520 struct c_binding *b;
8521 tree parm, decl, last;
8522 tree parmids = arg_info->parms;
8523 hash_set<tree> seen_args;
8525 if (!in_system_header_at (input_location))
8526 warning_at (DECL_SOURCE_LOCATION (fndecl),
8527 OPT_Wold_style_definition, "old-style function definition");
8529 /* Match each formal parameter name with its declaration. Save each
8530 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8531 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8533 if (TREE_VALUE (parm) == 0)
8535 error_at (DECL_SOURCE_LOCATION (fndecl),
8536 "parameter name missing from parameter list");
8537 TREE_PURPOSE (parm) = 0;
8541 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
8542 if (b && B_IN_CURRENT_SCOPE (b))
8545 /* Skip erroneous parameters. */
8546 if (decl == error_mark_node)
8548 /* If we got something other than a PARM_DECL it is an error. */
8549 if (TREE_CODE (decl) != PARM_DECL)
8550 error_at (DECL_SOURCE_LOCATION (decl),
8551 "%qD declared as a non-parameter", decl);
8552 /* If the declaration is already marked, we have a duplicate
8553 name. Complain and ignore the duplicate. */
8554 else if (seen_args.contains (decl))
8556 error_at (DECL_SOURCE_LOCATION (decl),
8557 "multiple parameters named %qD", decl);
8558 TREE_PURPOSE (parm) = 0;
8561 /* If the declaration says "void", complain and turn it into
8563 else if (VOID_TYPE_P (TREE_TYPE (decl)))
8565 error_at (DECL_SOURCE_LOCATION (decl),
8566 "parameter %qD declared with void type", decl);
8567 TREE_TYPE (decl) = integer_type_node;
8568 DECL_ARG_TYPE (decl) = integer_type_node;
8569 layout_decl (decl, 0);
8571 warn_if_shadowing (decl);
8573 /* If no declaration found, default to int. */
8576 /* FIXME diagnostics: This should be the location of the argument,
8577 not the FNDECL. E.g., for an old-style declaration
8579 int f10(v) { blah; }
8581 We should use the location of the V, not the F10.
8582 Unfortunately, the V is an IDENTIFIER_NODE which has no
8583 location. In the future we need locations for c_arg_info
8586 See gcc.dg/Wshadow-3.c for an example of this problem. */
8587 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
8588 PARM_DECL, TREE_VALUE (parm), integer_type_node);
8589 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
8591 warn_if_shadowing (decl);
8594 pedwarn (DECL_SOURCE_LOCATION (decl),
8595 OPT_Wimplicit_int, "type of %qD defaults to %<int%>",
8598 warning_at (DECL_SOURCE_LOCATION (decl),
8599 OPT_Wmissing_parameter_type,
8600 "type of %qD defaults to %<int%>", decl);
8603 TREE_PURPOSE (parm) = decl;
8604 seen_args.add (decl);
8607 /* Now examine the parms chain for incomplete declarations
8608 and declarations with no corresponding names. */
8610 for (b = current_scope->bindings; b; b = b->prev)
8613 if (TREE_CODE (parm) != PARM_DECL)
8616 if (TREE_TYPE (parm) != error_mark_node
8617 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
8619 error_at (DECL_SOURCE_LOCATION (parm),
8620 "parameter %qD has incomplete type", parm);
8621 TREE_TYPE (parm) = error_mark_node;
8624 if (!seen_args.contains (parm))
8626 error_at (DECL_SOURCE_LOCATION (parm),
8627 "declaration for parameter %qD but no such parameter",
8630 /* Pretend the parameter was not missing.
8631 This gets us to a standard state and minimizes
8632 further error messages. */
8633 parmids = chainon (parmids, tree_cons (parm, 0, 0));
8637 /* Chain the declarations together in the order of the list of
8638 names. Store that chain in the function decl, replacing the
8639 list of names. Update the current scope to match. */
8640 DECL_ARGUMENTS (fndecl) = 0;
8642 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8643 if (TREE_PURPOSE (parm))
8645 if (parm && TREE_PURPOSE (parm))
8647 last = TREE_PURPOSE (parm);
8648 DECL_ARGUMENTS (fndecl) = last;
8650 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
8651 if (TREE_PURPOSE (parm))
8653 DECL_CHAIN (last) = TREE_PURPOSE (parm);
8654 last = TREE_PURPOSE (parm);
8656 DECL_CHAIN (last) = 0;
8659 /* If there was a previous prototype,
8660 set the DECL_ARG_TYPE of each argument according to
8661 the type previously specified, and report any mismatches. */
8663 if (current_function_prototype_arg_types)
8666 for (parm = DECL_ARGUMENTS (fndecl),
8667 type = current_function_prototype_arg_types;
8668 parm || (type && TREE_VALUE (type) != error_mark_node
8669 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
8670 parm = DECL_CHAIN (parm), type = TREE_CHAIN (type))
8672 if (parm == 0 || type == 0
8673 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
8675 if (current_function_prototype_built_in)
8676 warning_at (DECL_SOURCE_LOCATION (fndecl),
8677 0, "number of arguments doesn%'t match "
8678 "built-in prototype");
8681 /* FIXME diagnostics: This should be the location of
8682 FNDECL, but there is bug when a prototype is
8683 declared inside function context, but defined
8684 outside of it (e.g., gcc.dg/pr15698-2.c). In
8685 which case FNDECL gets the location of the
8686 prototype, not the definition. */
8687 error_at (input_location,
8688 "number of arguments doesn%'t match prototype");
8690 error_at (current_function_prototype_locus,
8691 "prototype declaration");
8695 /* Type for passing arg must be consistent with that
8696 declared for the arg. ISO C says we take the unqualified
8697 type for parameters declared with qualified type. */
8698 if (TREE_TYPE (parm) != error_mark_node
8699 && TREE_TYPE (type) != error_mark_node
8700 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
8701 != TYPE_ATOMIC (TREE_VALUE (type)))
8702 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
8703 TYPE_MAIN_VARIANT (TREE_VALUE (type)))))
8705 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
8706 == TYPE_ATOMIC (TREE_VALUE (type)))
8707 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
8708 == TYPE_MAIN_VARIANT (TREE_VALUE (type))))
8710 /* Adjust argument to match prototype. E.g. a previous
8711 `int foo(float);' prototype causes
8712 `int foo(x) float x; {...}' to be treated like
8713 `int foo(float x) {...}'. This is particularly
8714 useful for argument types like uid_t. */
8715 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
8717 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
8718 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
8719 && TYPE_PRECISION (TREE_TYPE (parm))
8720 < TYPE_PRECISION (integer_type_node))
8721 DECL_ARG_TYPE (parm)
8722 = c_type_promotes_to (TREE_TYPE (parm));
8724 /* ??? Is it possible to get here with a
8725 built-in prototype or will it always have
8726 been diagnosed as conflicting with an
8727 old-style definition and discarded? */
8728 if (current_function_prototype_built_in)
8729 warning_at (DECL_SOURCE_LOCATION (parm),
8730 OPT_Wpedantic, "promoted argument %qD "
8731 "doesn%'t match built-in prototype", parm);
8734 pedwarn (DECL_SOURCE_LOCATION (parm),
8735 OPT_Wpedantic, "promoted argument %qD "
8736 "doesn%'t match prototype", parm);
8737 pedwarn (current_function_prototype_locus, OPT_Wpedantic,
8738 "prototype declaration");
8743 if (current_function_prototype_built_in)
8744 warning_at (DECL_SOURCE_LOCATION (parm),
8745 0, "argument %qD doesn%'t match "
8746 "built-in prototype", parm);
8749 error_at (DECL_SOURCE_LOCATION (parm),
8750 "argument %qD doesn%'t match prototype", parm);
8751 error_at (current_function_prototype_locus,
8752 "prototype declaration");
8757 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
8760 /* Otherwise, create a prototype that would match. */
8764 tree actual = 0, last = 0, type;
8766 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm))
8768 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
8770 TREE_CHAIN (last) = type;
8775 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
8777 TREE_CHAIN (last) = type;
8781 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8782 of the type of this function, but we need to avoid having this
8783 affect the types of other similarly-typed functions, so we must
8784 first force the generation of an identical (but separate) type
8785 node for the relevant function type. The new node we create
8786 will be a variant of the main variant of the original function
8789 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
8791 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
8795 /* Store parameter declarations passed in ARG_INFO into the current
8796 function declaration. */
8799 store_parm_decls_from (struct c_arg_info *arg_info)
8801 current_function_arg_info = arg_info;
8802 store_parm_decls ();
8805 /* Called by walk_tree to look for and update context-less labels. */
8808 set_labels_context_r (tree *tp, int *walk_subtrees, void *data)
8810 if (TREE_CODE (*tp) == LABEL_EXPR
8811 && DECL_CONTEXT (LABEL_EXPR_LABEL (*tp)) == NULL_TREE)
8813 DECL_CONTEXT (LABEL_EXPR_LABEL (*tp)) = static_cast<tree>(data);
8820 /* Store the parameter declarations into the current function declaration.
8821 This is called after parsing the parameter declarations, before
8822 digesting the body of the function.
8824 For an old-style definition, construct a prototype out of the old-style
8825 parameter declarations and inject it into the function's type. */
8828 store_parm_decls (void)
8830 tree fndecl = current_function_decl;
8833 /* The argument information block for FNDECL. */
8834 struct c_arg_info *arg_info = current_function_arg_info;
8835 current_function_arg_info = 0;
8837 /* True if this definition is written with a prototype. Note:
8838 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8839 list in a function definition as equivalent to (void) -- an
8840 empty argument list specifies the function has no parameters,
8841 but only (void) sets up a prototype for future calls. */
8842 proto = arg_info->types != 0;
8845 store_parm_decls_newstyle (fndecl, arg_info);
8847 store_parm_decls_oldstyle (fndecl, arg_info);
8849 /* The next call to push_scope will be a function body. */
8851 next_is_function_body = true;
8853 /* Write a record describing this function definition to the prototypes
8854 file (if requested). */
8856 gen_aux_info_record (fndecl, 1, 0, proto);
8858 /* Initialize the RTL code for the function. */
8859 allocate_struct_function (fndecl, false);
8861 if (warn_unused_local_typedefs)
8862 cfun->language = ggc_cleared_alloc<language_function> ();
8864 /* Begin the statement tree for this function. */
8865 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
8867 /* ??? Insert the contents of the pending sizes list into the function
8868 to be evaluated. The only reason left to have this is
8869 void foo(int n, int array[n++])
8870 because we throw away the array type in favor of a pointer type, and
8871 thus won't naturally see the SAVE_EXPR containing the increment. All
8872 other pending sizes would be handled by gimplify_parameters. */
8873 if (arg_info->pending_sizes)
8875 /* In very special circumstances, e.g. for code like
8877 void f (int a[i += 2]) {}
8878 we need to execute the atomic assignment on function entry.
8879 But in this case, it is not just a straight store, it has the
8880 op= form, which means that build_atomic_assign has generated
8881 gotos, labels, etc. Because at that time the function decl
8882 for F has not been created yet, those labels do not have any
8883 function context. But we have the fndecl now, so update the
8884 labels accordingly. gimplify_expr would crash otherwise. */
8885 walk_tree_without_duplicates (&arg_info->pending_sizes,
8886 set_labels_context_r, fndecl);
8887 add_stmt (arg_info->pending_sizes);
8891 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8892 c_finish_omp_declare_simd for function prototypes. No diagnostics
8896 temp_store_parm_decls (tree fndecl, tree parms)
8899 for (tree p = parms; p; p = DECL_CHAIN (p))
8901 DECL_CONTEXT (p) = fndecl;
8903 bind (DECL_NAME (p), p, current_scope,
8904 /*invisible=*/false, /*nested=*/false,
8909 /* Undo what temp_store_parm_decls did. */
8912 temp_pop_parm_decls (void)
8914 /* Clear all bindings in this temporary scope, so that
8915 pop_scope doesn't create a BLOCK. */
8916 struct c_binding *b = current_scope->bindings;
8917 current_scope->bindings = NULL;
8918 for (; b; b = free_binding_and_advance (b))
8920 gcc_assert (TREE_CODE (b->decl) == PARM_DECL);
8921 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
8922 I_SYMBOL_BINDING (b->id) = b->shadowed;
8923 if (b->shadowed && b->shadowed->u.type)
8924 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
8930 /* Finish up a function declaration and compile that function
8931 all the way to assembler language output. Then free the storage
8932 for the function definition.
8934 This is called after parsing the body of the function definition. */
8937 finish_function (void)
8939 tree fndecl = current_function_decl;
8941 if (c_dialect_objc ())
8942 objc_finish_function ();
8944 if (TREE_CODE (fndecl) == FUNCTION_DECL
8945 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
8947 tree args = DECL_ARGUMENTS (fndecl);
8948 for (; args; args = DECL_CHAIN (args))
8950 tree type = TREE_TYPE (args);
8951 if (INTEGRAL_TYPE_P (type)
8952 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
8953 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
8957 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
8958 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
8960 /* Must mark the RESULT_DECL as being in this function. */
8962 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
8963 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
8965 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
8966 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
8967 == integer_type_node && flag_isoc99)
8969 /* Hack. We don't want the middle-end to warn that this return
8970 is unreachable, so we mark its location as special. Using
8971 UNKNOWN_LOCATION has the problem that it gets clobbered in
8972 annotate_one_with_locus. A cleaner solution might be to
8973 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8975 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
8978 /* Tie off the statement tree for this function. */
8979 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
8981 /* If the function has _Cilk_spawn in front of a function call inside it
8982 i.e. it is a spawning function, then add the appropriate Cilk plus
8983 functions inside. */
8984 if (fn_contains_cilk_spawn_p (cfun))
8985 cfun->cilk_frame_decl = insert_cilk_frame (fndecl);
8987 finish_fname_decls ();
8989 /* Complain if there's just no return statement. */
8990 if (warn_return_type
8991 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
8992 && !current_function_returns_value && !current_function_returns_null
8993 /* Don't complain if we are no-return. */
8994 && !current_function_returns_abnormally
8995 /* Don't complain if we are declared noreturn. */
8996 && !TREE_THIS_VOLATILE (fndecl)
8997 /* Don't warn for main(). */
8998 && !MAIN_NAME_P (DECL_NAME (fndecl))
8999 /* Or if they didn't actually specify a return type. */
9000 && !C_FUNCTION_IMPLICIT_INT (fndecl)
9001 /* Normally, with -Wreturn-type, flow will complain, but we might
9002 optimize out static functions. */
9003 && !TREE_PUBLIC (fndecl))
9005 warning (OPT_Wreturn_type,
9006 "no return statement in function returning non-void");
9007 TREE_NO_WARNING (fndecl) = 1;
9010 /* Complain about parameters that are only set, but never otherwise used. */
9011 if (warn_unused_but_set_parameter)
9015 for (decl = DECL_ARGUMENTS (fndecl);
9017 decl = DECL_CHAIN (decl))
9018 if (TREE_USED (decl)
9019 && TREE_CODE (decl) == PARM_DECL
9020 && !DECL_READ_P (decl)
9022 && !DECL_ARTIFICIAL (decl)
9023 && !TREE_NO_WARNING (decl))
9024 warning_at (DECL_SOURCE_LOCATION (decl),
9025 OPT_Wunused_but_set_parameter,
9026 "parameter %qD set but not used", decl);
9029 /* Complain about locally defined typedefs that are not used in this
9031 maybe_warn_unused_local_typedefs ();
9033 /* Store the end of the function, so that we get good line number
9034 info for the epilogue. */
9035 cfun->function_end_locus = input_location;
9037 /* Finalize the ELF visibility for the function. */
9038 c_determine_visibility (fndecl);
9040 /* For GNU C extern inline functions disregard inline limits. */
9041 if (DECL_EXTERNAL (fndecl)
9042 && DECL_DECLARED_INLINE_P (fndecl))
9043 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
9045 /* Genericize before inlining. Delay genericizing nested functions
9046 until their parent function is genericized. Since finalizing
9047 requires GENERIC, delay that as well. */
9049 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
9050 && !undef_nested_function)
9052 if (!decl_function_context (fndecl))
9054 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
9055 c_genericize (fndecl);
9057 /* ??? Objc emits functions after finalizing the compilation unit.
9058 This should be cleaned up later and this conditional removed. */
9059 if (symtab->global_info_ready)
9061 cgraph_node::add_new_function (fndecl, false);
9064 cgraph_node::finalize_function (fndecl, false);
9068 /* Register this function with cgraph just far enough to get it
9069 added to our parent's nested function list. Handy, since the
9070 C front end doesn't have such a list. */
9071 (void) cgraph_node::get_create (fndecl);
9075 if (!decl_function_context (fndecl))
9076 undef_nested_function = false;
9078 if (cfun->language != NULL)
9080 ggc_free (cfun->language);
9081 cfun->language = NULL;
9084 /* We're leaving the context of this function, so zap cfun.
9085 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
9086 tree_rest_of_compilation. */
9088 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION, current_function_decl);
9089 current_function_decl = NULL;
9092 /* Check the declarations given in a for-loop for satisfying the C99
9093 constraints. If exactly one such decl is found, return it. LOC is
9094 the location of the opening parenthesis of the for loop. The last
9095 parameter allows you to control the "for loop initial declarations
9096 are only allowed in C99 mode". Normally, you should pass
9097 flag_isoc99 as that parameter. But in some cases (Objective-C
9098 foreach loop, for example) we want to run the checks in this
9099 function even if not in C99 mode, so we allow the caller to turn
9100 off the error about not being in C99 mode.
9104 check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error)
9106 struct c_binding *b;
9107 tree one_decl = NULL_TREE;
9110 if (!turn_off_iso_c99_error)
9112 static bool hint = true;
9113 /* If we get here, declarations have been used in a for loop without
9114 the C99 for loop scope. This doesn't make much sense, so don't
9116 error_at (loc, "%<for%> loop initial declarations "
9117 "are only allowed in C99 or C11 mode");
9121 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
9122 "to compile your code");
9127 /* C99 subclause 6.8.5 paragraph 3:
9129 [#3] The declaration part of a for statement shall only
9130 declare identifiers for objects having storage class auto or
9133 It isn't clear whether, in this sentence, "identifiers" binds to
9134 "shall only declare" or to "objects" - that is, whether all identifiers
9135 declared must be identifiers for objects, or whether the restriction
9136 only applies to those that are. (A question on this in comp.std.c
9137 in November 2000 received no answer.) We implement the strictest
9138 interpretation, to avoid creating an extension which later causes
9141 for (b = current_scope->bindings; b; b = b->prev)
9144 tree decl = b->decl;
9149 switch (TREE_CODE (decl))
9153 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
9154 if (TREE_STATIC (decl))
9156 "declaration of static variable %qD in %<for%> loop "
9157 "initial declaration", decl);
9158 else if (DECL_EXTERNAL (decl))
9160 "declaration of %<extern%> variable %qD in %<for%> loop "
9161 "initial declaration", decl);
9167 "%<struct %E%> declared in %<for%> loop initial "
9172 "%<union %E%> declared in %<for%> loop initial declaration",
9176 error_at (loc, "%<enum %E%> declared in %<for%> loop "
9177 "initial declaration", id);
9180 error_at (loc, "declaration of non-variable "
9181 "%qD in %<for%> loop initial declaration", decl);
9188 return n_decls == 1 ? one_decl : NULL_TREE;
9191 /* Save and reinitialize the variables
9192 used during compilation of a C function. */
9195 c_push_function_context (void)
9197 struct language_function *p = cfun->language;
9198 /* cfun->language might have been already allocated by the use of
9199 -Wunused-local-typedefs. In that case, just re-use it. */
9201 cfun->language = p = ggc_cleared_alloc<language_function> ();
9203 p->base.x_stmt_tree = c_stmt_tree;
9204 c_stmt_tree.x_cur_stmt_list = vec_safe_copy (c_stmt_tree.x_cur_stmt_list);
9205 p->x_break_label = c_break_label;
9206 p->x_cont_label = c_cont_label;
9207 p->x_switch_stack = c_switch_stack;
9208 p->arg_info = current_function_arg_info;
9209 p->returns_value = current_function_returns_value;
9210 p->returns_null = current_function_returns_null;
9211 p->returns_abnormally = current_function_returns_abnormally;
9212 p->warn_about_return_type = warn_about_return_type;
9214 push_function_context ();
9217 /* Restore the variables used during compilation of a C function. */
9220 c_pop_function_context (void)
9222 struct language_function *p;
9224 pop_function_context ();
9227 /* When -Wunused-local-typedefs is in effect, cfun->languages is
9228 used to store data throughout the life time of the current cfun,
9229 So don't deallocate it. */
9230 if (!warn_unused_local_typedefs)
9231 cfun->language = NULL;
9233 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
9234 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
9236 /* Stop pointing to the local nodes about to be freed. */
9237 /* But DECL_INITIAL must remain nonzero so we know this
9238 was an actual function definition. */
9239 DECL_INITIAL (current_function_decl) = error_mark_node;
9240 DECL_ARGUMENTS (current_function_decl) = 0;
9243 c_stmt_tree = p->base.x_stmt_tree;
9244 p->base.x_stmt_tree.x_cur_stmt_list = NULL;
9245 c_break_label = p->x_break_label;
9246 c_cont_label = p->x_cont_label;
9247 c_switch_stack = p->x_switch_stack;
9248 current_function_arg_info = p->arg_info;
9249 current_function_returns_value = p->returns_value;
9250 current_function_returns_null = p->returns_null;
9251 current_function_returns_abnormally = p->returns_abnormally;
9252 warn_about_return_type = p->warn_about_return_type;
9255 /* The functions below are required for functionality of doing
9256 function at once processing in the C front end. Currently these
9257 functions are not called from anywhere in the C front end, but as
9258 these changes continue, that will change. */
9260 /* Returns the stmt_tree (if any) to which statements are currently
9261 being added. If there is no active statement-tree, NULL is
9265 current_stmt_tree (void)
9267 return &c_stmt_tree;
9270 /* Return the global value of T as a symbol. */
9273 identifier_global_value (tree t)
9275 struct c_binding *b;
9277 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
9278 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
9284 /* In C, the only C-linkage public declaration is at file scope. */
9287 c_linkage_bindings (tree name)
9289 return identifier_global_value (name);
9292 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
9293 otherwise the name is found in ridpointers from RID_INDEX. */
9296 record_builtin_type (enum rid rid_index, const char *name, tree type)
9300 id = ridpointers[(int) rid_index];
9302 id = get_identifier (name);
9303 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
9305 if (debug_hooks->type_decl)
9306 debug_hooks->type_decl (decl, false);
9309 /* Build the void_list_node (void_type_node having been created). */
9311 build_void_list_node (void)
9313 tree t = build_tree_list (NULL_TREE, void_type_node);
9317 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
9320 build_c_parm (struct c_declspecs *specs, tree attrs,
9321 struct c_declarator *declarator)
9323 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
9326 ret->declarator = declarator;
9330 /* Return a declarator with nested attributes. TARGET is the inner
9331 declarator to which these attributes apply. ATTRS are the
9334 struct c_declarator *
9335 build_attrs_declarator (tree attrs, struct c_declarator *target)
9337 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9338 ret->kind = cdk_attrs;
9339 ret->declarator = target;
9340 ret->u.attrs = attrs;
9344 /* Return a declarator for a function with arguments specified by ARGS
9345 and return type specified by TARGET. */
9347 struct c_declarator *
9348 build_function_declarator (struct c_arg_info *args,
9349 struct c_declarator *target)
9351 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9352 ret->kind = cdk_function;
9353 ret->declarator = target;
9354 ret->u.arg_info = args;
9358 /* Return a declarator for the identifier IDENT (which may be
9359 NULL_TREE for an abstract declarator). */
9361 struct c_declarator *
9362 build_id_declarator (tree ident)
9364 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9366 ret->declarator = 0;
9368 /* Default value - may get reset to a more precise location. */
9369 ret->id_loc = input_location;
9373 /* Return something to represent absolute declarators containing a *.
9374 TARGET is the absolute declarator that the * contains.
9375 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
9376 to apply to the pointer type. */
9378 struct c_declarator *
9379 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
9380 struct c_declarator *target)
9384 struct c_declarator *itarget = target;
9385 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9386 if (type_quals_attrs)
9388 attrs = type_quals_attrs->attrs;
9389 quals = quals_from_declspecs (type_quals_attrs);
9390 if (attrs != NULL_TREE)
9391 itarget = build_attrs_declarator (attrs, target);
9393 ret->kind = cdk_pointer;
9394 ret->declarator = itarget;
9395 ret->u.pointer_quals = quals;
9399 /* Return a pointer to a structure for an empty list of declaration
9402 struct c_declspecs *
9403 build_null_declspecs (void)
9405 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
9406 memset (&ret->locations, 0, cdw_number_of_elements);
9411 ret->align_log = -1;
9412 ret->typespec_word = cts_none;
9413 ret->storage_class = csc_none;
9414 ret->expr_const_operands = true;
9415 ret->declspecs_seen_p = false;
9416 ret->typespec_kind = ctsk_none;
9417 ret->non_sc_seen_p = false;
9418 ret->typedef_p = false;
9419 ret->explicit_signed_p = false;
9420 ret->deprecated_p = false;
9421 ret->default_int_p = false;
9422 ret->long_p = false;
9423 ret->long_long_p = false;
9424 ret->short_p = false;
9425 ret->signed_p = false;
9426 ret->unsigned_p = false;
9427 ret->complex_p = false;
9428 ret->inline_p = false;
9429 ret->noreturn_p = false;
9430 ret->thread_p = false;
9431 ret->thread_gnu_p = false;
9432 ret->const_p = false;
9433 ret->volatile_p = false;
9434 ret->atomic_p = false;
9435 ret->restrict_p = false;
9436 ret->saturating_p = false;
9437 ret->alignas_p = false;
9438 ret->address_space = ADDR_SPACE_GENERIC;
9442 /* Add the address space ADDRSPACE to the declaration specifiers
9443 SPECS, returning SPECS. */
9445 struct c_declspecs *
9446 declspecs_add_addrspace (source_location location,
9447 struct c_declspecs *specs, addr_space_t as)
9449 specs->non_sc_seen_p = true;
9450 specs->declspecs_seen_p = true;
9452 if (!ADDR_SPACE_GENERIC_P (specs->address_space)
9453 && specs->address_space != as)
9454 error ("incompatible address space qualifiers %qs and %qs",
9455 c_addr_space_name (as),
9456 c_addr_space_name (specs->address_space));
9459 specs->address_space = as;
9460 specs->locations[cdw_address_space] = location;
9465 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9468 struct c_declspecs *
9469 declspecs_add_qual (source_location loc,
9470 struct c_declspecs *specs, tree qual)
9474 specs->non_sc_seen_p = true;
9475 specs->declspecs_seen_p = true;
9476 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
9477 && C_IS_RESERVED_WORD (qual));
9478 i = C_RID_CODE (qual);
9482 dupe = specs->const_p;
9483 specs->const_p = true;
9484 specs->locations[cdw_const] = loc;
9487 dupe = specs->volatile_p;
9488 specs->volatile_p = true;
9489 specs->locations[cdw_volatile] = loc;
9492 dupe = specs->restrict_p;
9493 specs->restrict_p = true;
9494 specs->locations[cdw_restrict] = loc;
9497 dupe = specs->atomic_p;
9498 specs->atomic_p = true;
9504 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %qE", qual);
9508 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9511 struct c_declspecs *
9512 declspecs_add_type (location_t loc, struct c_declspecs *specs,
9513 struct c_typespec spec)
9515 tree type = spec.spec;
9516 specs->non_sc_seen_p = true;
9517 specs->declspecs_seen_p = true;
9518 specs->typespec_kind = spec.kind;
9519 if (TREE_DEPRECATED (type))
9520 specs->deprecated_p = true;
9522 /* Handle type specifier keywords. */
9523 if (TREE_CODE (type) == IDENTIFIER_NODE
9524 && C_IS_RESERVED_WORD (type)
9525 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
9527 enum rid i = C_RID_CODE (type);
9530 error_at (loc, "two or more data types in declaration specifiers");
9533 if ((int) i <= (int) RID_LAST_MODIFIER)
9535 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9540 if (specs->long_long_p)
9542 error_at (loc, "%<long long long%> is too long for GCC");
9547 if (specs->typespec_word == cts_double)
9550 ("both %<long long%> and %<double%> in "
9551 "declaration specifiers"));
9554 pedwarn_c90 (loc, OPT_Wlong_long,
9555 "ISO C90 does not support %<long long%>");
9556 specs->long_long_p = 1;
9557 specs->locations[cdw_long_long] = loc;
9562 ("both %<long%> and %<short%> in "
9563 "declaration specifiers"));
9564 else if (specs->typespec_word == cts_auto_type)
9566 ("both %<long%> and %<__auto_type%> in "
9567 "declaration specifiers"));
9568 else if (specs->typespec_word == cts_void)
9570 ("both %<long%> and %<void%> in "
9571 "declaration specifiers"));
9572 else if (specs->typespec_word == cts_int_n)
9574 ("both %<long%> and %<__int%d%> in "
9575 "declaration specifiers"),
9576 int_n_data[specs->int_n_idx].bitsize);
9577 else if (specs->typespec_word == cts_bool)
9579 ("both %<long%> and %<_Bool%> in "
9580 "declaration specifiers"));
9581 else if (specs->typespec_word == cts_char)
9583 ("both %<long%> and %<char%> in "
9584 "declaration specifiers"));
9585 else if (specs->typespec_word == cts_float)
9587 ("both %<long%> and %<float%> in "
9588 "declaration specifiers"));
9589 else if (specs->typespec_word == cts_dfloat32)
9591 ("both %<long%> and %<_Decimal32%> in "
9592 "declaration specifiers"));
9593 else if (specs->typespec_word == cts_dfloat64)
9595 ("both %<long%> and %<_Decimal64%> in "
9596 "declaration specifiers"));
9597 else if (specs->typespec_word == cts_dfloat128)
9599 ("both %<long%> and %<_Decimal128%> in "
9600 "declaration specifiers"));
9603 specs->long_p = true;
9604 specs->locations[cdw_long] = loc;
9608 dupe = specs->short_p;
9611 ("both %<long%> and %<short%> in "
9612 "declaration specifiers"));
9613 else if (specs->typespec_word == cts_auto_type)
9615 ("both %<short%> and %<__auto_type%> in "
9616 "declaration specifiers"));
9617 else if (specs->typespec_word == cts_void)
9619 ("both %<short%> and %<void%> in "
9620 "declaration specifiers"));
9621 else if (specs->typespec_word == cts_int_n)
9623 ("both %<short%> and %<__int%d%> in "
9624 "declaration specifiers"),
9625 int_n_data[specs->int_n_idx].bitsize);
9626 else if (specs->typespec_word == cts_bool)
9628 ("both %<short%> and %<_Bool%> in "
9629 "declaration specifiers"));
9630 else if (specs->typespec_word == cts_char)
9632 ("both %<short%> and %<char%> in "
9633 "declaration specifiers"));
9634 else if (specs->typespec_word == cts_float)
9636 ("both %<short%> and %<float%> in "
9637 "declaration specifiers"));
9638 else if (specs->typespec_word == cts_double)
9640 ("both %<short%> and %<double%> in "
9641 "declaration specifiers"));
9642 else if (specs->typespec_word == cts_dfloat32)
9644 ("both %<short%> and %<_Decimal32%> in "
9645 "declaration specifiers"));
9646 else if (specs->typespec_word == cts_dfloat64)
9648 ("both %<short%> and %<_Decimal64%> in "
9649 "declaration specifiers"));
9650 else if (specs->typespec_word == cts_dfloat128)
9652 ("both %<short%> and %<_Decimal128%> in "
9653 "declaration specifiers"));
9656 specs->short_p = true;
9657 specs->locations[cdw_short] = loc;
9661 dupe = specs->signed_p;
9662 if (specs->unsigned_p)
9664 ("both %<signed%> and %<unsigned%> in "
9665 "declaration specifiers"));
9666 else if (specs->typespec_word == cts_auto_type)
9668 ("both %<signed%> and %<__auto_type%> in "
9669 "declaration specifiers"));
9670 else if (specs->typespec_word == cts_void)
9672 ("both %<signed%> and %<void%> in "
9673 "declaration specifiers"));
9674 else if (specs->typespec_word == cts_bool)
9676 ("both %<signed%> and %<_Bool%> in "
9677 "declaration specifiers"));
9678 else if (specs->typespec_word == cts_float)
9680 ("both %<signed%> and %<float%> in "
9681 "declaration specifiers"));
9682 else if (specs->typespec_word == cts_double)
9684 ("both %<signed%> and %<double%> in "
9685 "declaration specifiers"));
9686 else if (specs->typespec_word == cts_dfloat32)
9688 ("both %<signed%> and %<_Decimal32%> in "
9689 "declaration specifiers"));
9690 else if (specs->typespec_word == cts_dfloat64)
9692 ("both %<signed%> and %<_Decimal64%> in "
9693 "declaration specifiers"));
9694 else if (specs->typespec_word == cts_dfloat128)
9696 ("both %<signed%> and %<_Decimal128%> in "
9697 "declaration specifiers"));
9700 specs->signed_p = true;
9701 specs->locations[cdw_signed] = loc;
9705 dupe = specs->unsigned_p;
9706 if (specs->signed_p)
9708 ("both %<signed%> and %<unsigned%> in "
9709 "declaration specifiers"));
9710 else if (specs->typespec_word == cts_auto_type)
9712 ("both %<unsigned%> and %<__auto_type%> in "
9713 "declaration specifiers"));
9714 else if (specs->typespec_word == cts_void)
9716 ("both %<unsigned%> and %<void%> in "
9717 "declaration specifiers"));
9718 else if (specs->typespec_word == cts_bool)
9720 ("both %<unsigned%> and %<_Bool%> in "
9721 "declaration specifiers"));
9722 else if (specs->typespec_word == cts_float)
9724 ("both %<unsigned%> and %<float%> in "
9725 "declaration specifiers"));
9726 else if (specs->typespec_word == cts_double)
9728 ("both %<unsigned%> and %<double%> in "
9729 "declaration specifiers"));
9730 else if (specs->typespec_word == cts_dfloat32)
9732 ("both %<unsigned%> and %<_Decimal32%> in "
9733 "declaration specifiers"));
9734 else if (specs->typespec_word == cts_dfloat64)
9736 ("both %<unsigned%> and %<_Decimal64%> in "
9737 "declaration specifiers"));
9738 else if (specs->typespec_word == cts_dfloat128)
9740 ("both %<unsigned%> and %<_Decimal128%> in "
9741 "declaration specifiers"));
9744 specs->unsigned_p = true;
9745 specs->locations[cdw_unsigned] = loc;
9749 dupe = specs->complex_p;
9750 if (!in_system_header_at (loc))
9751 pedwarn_c90 (loc, OPT_Wpedantic,
9752 "ISO C90 does not support complex types");
9753 if (specs->typespec_word == cts_auto_type)
9755 ("both %<complex%> and %<__auto_type%> in "
9756 "declaration specifiers"));
9757 else if (specs->typespec_word == cts_void)
9759 ("both %<complex%> and %<void%> in "
9760 "declaration specifiers"));
9761 else if (specs->typespec_word == cts_bool)
9763 ("both %<complex%> and %<_Bool%> in "
9764 "declaration specifiers"));
9765 else if (specs->typespec_word == cts_dfloat32)
9767 ("both %<complex%> and %<_Decimal32%> in "
9768 "declaration specifiers"));
9769 else if (specs->typespec_word == cts_dfloat64)
9771 ("both %<complex%> and %<_Decimal64%> in "
9772 "declaration specifiers"));
9773 else if (specs->typespec_word == cts_dfloat128)
9775 ("both %<complex%> and %<_Decimal128%> in "
9776 "declaration specifiers"));
9777 else if (specs->typespec_word == cts_fract)
9779 ("both %<complex%> and %<_Fract%> in "
9780 "declaration specifiers"));
9781 else if (specs->typespec_word == cts_accum)
9783 ("both %<complex%> and %<_Accum%> in "
9784 "declaration specifiers"));
9785 else if (specs->saturating_p)
9787 ("both %<complex%> and %<_Sat%> in "
9788 "declaration specifiers"));
9791 specs->complex_p = true;
9792 specs->locations[cdw_complex] = loc;
9796 dupe = specs->saturating_p;
9797 pedwarn (loc, OPT_Wpedantic,
9798 "ISO C does not support saturating types");
9799 if (specs->typespec_word == cts_int_n)
9802 ("both %<_Sat%> and %<__int%d%> in "
9803 "declaration specifiers"),
9804 int_n_data[specs->int_n_idx].bitsize);
9806 else if (specs->typespec_word == cts_auto_type)
9808 ("both %<_Sat%> and %<__auto_type%> in "
9809 "declaration specifiers"));
9810 else if (specs->typespec_word == cts_void)
9812 ("both %<_Sat%> and %<void%> in "
9813 "declaration specifiers"));
9814 else if (specs->typespec_word == cts_bool)
9816 ("both %<_Sat%> and %<_Bool%> in "
9817 "declaration specifiers"));
9818 else if (specs->typespec_word == cts_char)
9820 ("both %<_Sat%> and %<char%> in "
9821 "declaration specifiers"));
9822 else if (specs->typespec_word == cts_int)
9824 ("both %<_Sat%> and %<int%> in "
9825 "declaration specifiers"));
9826 else if (specs->typespec_word == cts_float)
9828 ("both %<_Sat%> and %<float%> in "
9829 "declaration specifiers"));
9830 else if (specs->typespec_word == cts_double)
9832 ("both %<_Sat%> and %<double%> in "
9833 "declaration specifiers"));
9834 else if (specs->typespec_word == cts_dfloat32)
9836 ("both %<_Sat%> and %<_Decimal32%> in "
9837 "declaration specifiers"));
9838 else if (specs->typespec_word == cts_dfloat64)
9840 ("both %<_Sat%> and %<_Decimal64%> in "
9841 "declaration specifiers"));
9842 else if (specs->typespec_word == cts_dfloat128)
9844 ("both %<_Sat%> and %<_Decimal128%> in "
9845 "declaration specifiers"));
9846 else if (specs->complex_p)
9848 ("both %<_Sat%> and %<complex%> in "
9849 "declaration specifiers"));
9852 specs->saturating_p = true;
9853 specs->locations[cdw_saturating] = loc;
9861 error_at (loc, "duplicate %qE", type);
9867 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9868 "__intN", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9870 if (specs->typespec_word != cts_none)
9873 "two or more data types in declaration specifiers");
9881 ("both %<long%> and %<__auto_type%> in "
9882 "declaration specifiers"));
9883 else if (specs->short_p)
9885 ("both %<short%> and %<__auto_type%> in "
9886 "declaration specifiers"));
9887 else if (specs->signed_p)
9889 ("both %<signed%> and %<__auto_type%> in "
9890 "declaration specifiers"));
9891 else if (specs->unsigned_p)
9893 ("both %<unsigned%> and %<__auto_type%> in "
9894 "declaration specifiers"));
9895 else if (specs->complex_p)
9897 ("both %<complex%> and %<__auto_type%> in "
9898 "declaration specifiers"));
9899 else if (specs->saturating_p)
9901 ("both %<_Sat%> and %<__auto_type%> in "
9902 "declaration specifiers"));
9905 specs->typespec_word = cts_auto_type;
9906 specs->locations[cdw_typespec] = loc;
9913 specs->int_n_idx = i - RID_INT_N_0;
9914 if (!in_system_header_at (input_location))
9915 pedwarn (loc, OPT_Wpedantic,
9916 "ISO C does not support %<__int%d%> types",
9917 int_n_data[specs->int_n_idx].bitsize);
9921 ("both %<__int%d%> and %<long%> in "
9922 "declaration specifiers"),
9923 int_n_data[specs->int_n_idx].bitsize);
9924 else if (specs->saturating_p)
9926 ("both %<_Sat%> and %<__int%d%> in "
9927 "declaration specifiers"),
9928 int_n_data[specs->int_n_idx].bitsize);
9929 else if (specs->short_p)
9931 ("both %<__int%d%> and %<short%> in "
9932 "declaration specifiers"),
9933 int_n_data[specs->int_n_idx].bitsize);
9934 else if (! int_n_enabled_p [specs->int_n_idx])
9936 "%<__int%d%> is not supported on this target",
9937 int_n_data[specs->int_n_idx].bitsize);
9940 specs->typespec_word = cts_int_n;
9941 specs->locations[cdw_typespec] = loc;
9947 ("both %<long%> and %<void%> in "
9948 "declaration specifiers"));
9949 else if (specs->short_p)
9951 ("both %<short%> and %<void%> in "
9952 "declaration specifiers"));
9953 else if (specs->signed_p)
9955 ("both %<signed%> and %<void%> in "
9956 "declaration specifiers"));
9957 else if (specs->unsigned_p)
9959 ("both %<unsigned%> and %<void%> in "
9960 "declaration specifiers"));
9961 else if (specs->complex_p)
9963 ("both %<complex%> and %<void%> in "
9964 "declaration specifiers"));
9965 else if (specs->saturating_p)
9967 ("both %<_Sat%> and %<void%> in "
9968 "declaration specifiers"));
9971 specs->typespec_word = cts_void;
9972 specs->locations[cdw_typespec] = loc;
9976 if (!in_system_header_at (loc))
9977 pedwarn_c90 (loc, OPT_Wpedantic,
9978 "ISO C90 does not support boolean types");
9981 ("both %<long%> and %<_Bool%> in "
9982 "declaration specifiers"));
9983 else if (specs->short_p)
9985 ("both %<short%> and %<_Bool%> in "
9986 "declaration specifiers"));
9987 else if (specs->signed_p)
9989 ("both %<signed%> and %<_Bool%> in "
9990 "declaration specifiers"));
9991 else if (specs->unsigned_p)
9993 ("both %<unsigned%> and %<_Bool%> in "
9994 "declaration specifiers"));
9995 else if (specs->complex_p)
9997 ("both %<complex%> and %<_Bool%> in "
9998 "declaration specifiers"));
9999 else if (specs->saturating_p)
10001 ("both %<_Sat%> and %<_Bool%> in "
10002 "declaration specifiers"));
10005 specs->typespec_word = cts_bool;
10006 specs->locations[cdw_typespec] = loc;
10012 ("both %<long%> and %<char%> in "
10013 "declaration specifiers"));
10014 else if (specs->short_p)
10016 ("both %<short%> and %<char%> in "
10017 "declaration specifiers"));
10018 else if (specs->saturating_p)
10020 ("both %<_Sat%> and %<char%> in "
10021 "declaration specifiers"));
10024 specs->typespec_word = cts_char;
10025 specs->locations[cdw_typespec] = loc;
10029 if (specs->saturating_p)
10031 ("both %<_Sat%> and %<int%> in "
10032 "declaration specifiers"));
10035 specs->typespec_word = cts_int;
10036 specs->locations[cdw_typespec] = loc;
10042 ("both %<long%> and %<float%> in "
10043 "declaration specifiers"));
10044 else if (specs->short_p)
10046 ("both %<short%> and %<float%> in "
10047 "declaration specifiers"));
10048 else if (specs->signed_p)
10050 ("both %<signed%> and %<float%> in "
10051 "declaration specifiers"));
10052 else if (specs->unsigned_p)
10054 ("both %<unsigned%> and %<float%> in "
10055 "declaration specifiers"));
10056 else if (specs->saturating_p)
10058 ("both %<_Sat%> and %<float%> in "
10059 "declaration specifiers"));
10062 specs->typespec_word = cts_float;
10063 specs->locations[cdw_typespec] = loc;
10067 if (specs->long_long_p)
10069 ("both %<long long%> and %<double%> in "
10070 "declaration specifiers"));
10071 else if (specs->short_p)
10073 ("both %<short%> and %<double%> in "
10074 "declaration specifiers"));
10075 else if (specs->signed_p)
10077 ("both %<signed%> and %<double%> in "
10078 "declaration specifiers"));
10079 else if (specs->unsigned_p)
10081 ("both %<unsigned%> and %<double%> in "
10082 "declaration specifiers"));
10083 else if (specs->saturating_p)
10085 ("both %<_Sat%> and %<double%> in "
10086 "declaration specifiers"));
10089 specs->typespec_word = cts_double;
10090 specs->locations[cdw_typespec] = loc;
10095 case RID_DFLOAT128:
10098 if (i == RID_DFLOAT32)
10099 str = "_Decimal32";
10100 else if (i == RID_DFLOAT64)
10101 str = "_Decimal64";
10103 str = "_Decimal128";
10104 if (specs->long_long_p)
10106 ("both %<long long%> and %<%s%> in "
10107 "declaration specifiers"),
10111 ("both %<long%> and %<%s%> in "
10112 "declaration specifiers"),
10114 else if (specs->short_p)
10116 ("both %<short%> and %<%s%> in "
10117 "declaration specifiers"),
10119 else if (specs->signed_p)
10121 ("both %<signed%> and %<%s%> in "
10122 "declaration specifiers"),
10124 else if (specs->unsigned_p)
10126 ("both %<unsigned%> and %<%s%> in "
10127 "declaration specifiers"),
10129 else if (specs->complex_p)
10131 ("both %<complex%> and %<%s%> in "
10132 "declaration specifiers"),
10134 else if (specs->saturating_p)
10136 ("both %<_Sat%> and %<%s%> in "
10137 "declaration specifiers"),
10139 else if (i == RID_DFLOAT32)
10140 specs->typespec_word = cts_dfloat32;
10141 else if (i == RID_DFLOAT64)
10142 specs->typespec_word = cts_dfloat64;
10144 specs->typespec_word = cts_dfloat128;
10145 specs->locations[cdw_typespec] = loc;
10147 if (!targetm.decimal_float_supported_p ())
10149 ("decimal floating point not supported "
10150 "for this target"));
10151 pedwarn (loc, OPT_Wpedantic,
10152 "ISO C does not support decimal floating point");
10158 if (i == RID_FRACT)
10162 if (specs->complex_p)
10164 ("both %<complex%> and %<%s%> in "
10165 "declaration specifiers"),
10167 else if (i == RID_FRACT)
10168 specs->typespec_word = cts_fract;
10170 specs->typespec_word = cts_accum;
10171 specs->locations[cdw_typespec] = loc;
10173 if (!targetm.fixed_point_supported_p ())
10175 "fixed-point types not supported for this target");
10176 pedwarn (loc, OPT_Wpedantic,
10177 "ISO C does not support fixed-point types");
10180 /* ObjC reserved word "id", handled below. */
10186 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
10187 form of ObjC type, cases such as "int" and "long" being handled
10188 above), a TYPE (struct, union, enum and typeof specifiers) or an
10189 ERROR_MARK. In none of these cases may there have previously
10190 been any type specifiers. */
10191 if (specs->type || specs->typespec_word != cts_none
10192 || specs->long_p || specs->short_p || specs->signed_p
10193 || specs->unsigned_p || specs->complex_p)
10194 error_at (loc, "two or more data types in declaration specifiers");
10195 else if (TREE_CODE (type) == TYPE_DECL)
10197 if (TREE_TYPE (type) == error_mark_node)
10198 ; /* Allow the type to default to int to avoid cascading errors. */
10201 specs->type = TREE_TYPE (type);
10202 specs->decl_attr = DECL_ATTRIBUTES (type);
10203 specs->typedef_p = true;
10204 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
10205 specs->locations[cdw_typedef] = loc;
10207 /* If this typedef name is defined in a struct, then a C++
10208 lookup would return a different value. */
10209 if (warn_cxx_compat
10210 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
10211 warning_at (loc, OPT_Wc___compat,
10212 "C++ lookup of %qD would return a field, not a type",
10215 /* If we are parsing a struct, record that a struct field
10217 if (warn_cxx_compat && struct_parse_info != NULL)
10218 struct_parse_info->typedefs_seen.safe_push (type);
10221 else if (TREE_CODE (type) == IDENTIFIER_NODE)
10223 tree t = lookup_name (type);
10224 if (!t || TREE_CODE (t) != TYPE_DECL)
10225 error_at (loc, "%qE fails to be a typedef or built in type", type);
10226 else if (TREE_TYPE (t) == error_mark_node)
10230 specs->type = TREE_TYPE (t);
10231 specs->locations[cdw_typespec] = loc;
10236 if (TREE_CODE (type) != ERROR_MARK && spec.kind == ctsk_typeof)
10238 specs->typedef_p = true;
10239 specs->locations[cdw_typedef] = loc;
10243 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
10244 specs->expr, spec.expr);
10246 specs->expr = spec.expr;
10247 specs->expr_const_operands &= spec.expr_const_operands;
10250 specs->type = type;
10256 /* Add the storage class specifier or function specifier SCSPEC to the
10257 declaration specifiers SPECS, returning SPECS. */
10259 struct c_declspecs *
10260 declspecs_add_scspec (source_location loc,
10261 struct c_declspecs *specs,
10265 enum c_storage_class n = csc_none;
10267 specs->declspecs_seen_p = true;
10268 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
10269 && C_IS_RESERVED_WORD (scspec));
10270 i = C_RID_CODE (scspec);
10271 if (specs->non_sc_seen_p)
10272 warning (OPT_Wold_style_declaration,
10273 "%qE is not at beginning of declaration", scspec);
10277 /* C99 permits duplicate inline. Although of doubtful utility,
10278 it seems simplest to permit it in gnu89 mode as well, as
10279 there is also little utility in maintaining this as a
10280 difference between gnu89 and C99 inline. */
10282 specs->inline_p = true;
10283 specs->locations[cdw_inline] = loc;
10286 /* Duplicate _Noreturn is permitted. */
10288 specs->noreturn_p = true;
10289 specs->locations[cdw_noreturn] = loc;
10292 dupe = specs->thread_p;
10293 if (specs->storage_class == csc_auto)
10294 error ("%qE used with %<auto%>", scspec);
10295 else if (specs->storage_class == csc_register)
10296 error ("%qE used with %<register%>", scspec);
10297 else if (specs->storage_class == csc_typedef)
10298 error ("%qE used with %<typedef%>", scspec);
10301 specs->thread_p = true;
10302 specs->thread_gnu_p = (strcmp (IDENTIFIER_POINTER (scspec),
10304 /* A diagnostic is not required for the use of this
10305 identifier in the implementation namespace; only diagnose
10306 it for the C11 spelling because of existing code using
10307 the other spelling. */
10308 if (!specs->thread_gnu_p)
10311 pedwarn_c99 (loc, OPT_Wpedantic,
10312 "ISO C99 does not support %qE", scspec);
10314 pedwarn_c99 (loc, OPT_Wpedantic,
10315 "ISO C90 does not support %qE", scspec);
10317 specs->locations[cdw_thread] = loc;
10325 /* Diagnose "__thread extern". */
10326 if (specs->thread_p && specs->thread_gnu_p)
10327 error ("%<__thread%> before %<extern%>");
10334 /* Diagnose "__thread static". */
10335 if (specs->thread_p && specs->thread_gnu_p)
10336 error ("%<__thread%> before %<static%>");
10342 gcc_unreachable ();
10344 if (n != csc_none && n == specs->storage_class)
10348 if (i == RID_THREAD)
10349 error ("duplicate %<_Thread_local%> or %<__thread%>");
10351 error ("duplicate %qE", scspec);
10355 if (specs->storage_class != csc_none && n != specs->storage_class)
10357 error ("multiple storage classes in declaration specifiers");
10361 specs->storage_class = n;
10362 specs->locations[cdw_storage_class] = loc;
10363 if (n != csc_extern && n != csc_static && specs->thread_p)
10365 error ("%qs used with %qE",
10366 specs->thread_gnu_p ? "__thread" : "_Thread_local",
10368 specs->thread_p = false;
10375 /* Add the attributes ATTRS to the declaration specifiers SPECS,
10376 returning SPECS. */
10378 struct c_declspecs *
10379 declspecs_add_attrs (source_location loc, struct c_declspecs *specs, tree attrs)
10381 specs->attrs = chainon (attrs, specs->attrs);
10382 specs->locations[cdw_attributes] = loc;
10383 specs->declspecs_seen_p = true;
10387 /* Add an _Alignas specifier (expression ALIGN, or type whose
10388 alignment is ALIGN) to the declaration specifiers SPECS, returning
10390 struct c_declspecs *
10391 declspecs_add_alignas (source_location loc,
10392 struct c_declspecs *specs, tree align)
10395 specs->alignas_p = true;
10396 specs->locations[cdw_alignas] = loc;
10397 if (align == error_mark_node)
10399 align_log = check_user_alignment (align, true);
10400 if (align_log > specs->align_log)
10401 specs->align_log = align_log;
10405 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10406 specifiers with any other type specifier to determine the resulting
10407 type. This is where ISO C checks on complex types are made, since
10408 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10411 struct c_declspecs *
10412 finish_declspecs (struct c_declspecs *specs)
10414 /* If a type was specified as a whole, we have no modifiers and are
10416 if (specs->type != NULL_TREE)
10418 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
10419 && !specs->signed_p && !specs->unsigned_p
10420 && !specs->complex_p);
10422 /* Set a dummy type. */
10423 if (TREE_CODE (specs->type) == ERROR_MARK)
10424 specs->type = integer_type_node;
10428 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10429 has been specified, treat it as "int" unless "_Complex" is
10430 present and there are no other specifiers. If we just have
10431 "_Complex", it is equivalent to "_Complex double", but e.g.
10432 "_Complex short" is equivalent to "_Complex short int". */
10433 if (specs->typespec_word == cts_none)
10435 if (specs->saturating_p)
10437 error_at (specs->locations[cdw_saturating],
10438 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10439 if (!targetm.fixed_point_supported_p ())
10440 error_at (specs->locations[cdw_saturating],
10441 "fixed-point types not supported for this target");
10442 specs->typespec_word = cts_fract;
10444 else if (specs->long_p || specs->short_p
10445 || specs->signed_p || specs->unsigned_p)
10447 specs->typespec_word = cts_int;
10449 else if (specs->complex_p)
10451 specs->typespec_word = cts_double;
10452 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10453 "ISO C does not support plain %<complex%> meaning "
10454 "%<double complex%>");
10458 specs->typespec_word = cts_int;
10459 specs->default_int_p = true;
10460 /* We don't diagnose this here because grokdeclarator will
10461 give more specific diagnostics according to whether it is
10462 a function definition. */
10466 /* If "signed" was specified, record this to distinguish "int" and
10467 "signed int" in the case of a bit-field with
10468 -funsigned-bitfields. */
10469 specs->explicit_signed_p = specs->signed_p;
10471 /* Now compute the actual type. */
10472 switch (specs->typespec_word)
10474 case cts_auto_type:
10475 gcc_assert (!specs->long_p && !specs->short_p
10476 && !specs->signed_p && !specs->unsigned_p
10477 && !specs->complex_p);
10478 /* Type to be filled in later. */
10481 gcc_assert (!specs->long_p && !specs->short_p
10482 && !specs->signed_p && !specs->unsigned_p
10483 && !specs->complex_p);
10484 specs->type = void_type_node;
10487 gcc_assert (!specs->long_p && !specs->short_p
10488 && !specs->signed_p && !specs->unsigned_p
10489 && !specs->complex_p);
10490 specs->type = boolean_type_node;
10493 gcc_assert (!specs->long_p && !specs->short_p);
10494 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10495 if (specs->signed_p)
10496 specs->type = signed_char_type_node;
10497 else if (specs->unsigned_p)
10498 specs->type = unsigned_char_type_node;
10500 specs->type = char_type_node;
10501 if (specs->complex_p)
10503 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10504 "ISO C does not support complex integer types");
10505 specs->type = build_complex_type (specs->type);
10509 gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p);
10510 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10511 specs->type = (specs->unsigned_p
10512 ? int_n_trees[specs->int_n_idx].unsigned_type
10513 : int_n_trees[specs->int_n_idx].signed_type);
10514 if (specs->complex_p)
10516 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10517 "ISO C does not support complex integer types");
10518 specs->type = build_complex_type (specs->type);
10522 gcc_assert (!(specs->long_p && specs->short_p));
10523 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10524 if (specs->long_long_p)
10525 specs->type = (specs->unsigned_p
10526 ? long_long_unsigned_type_node
10527 : long_long_integer_type_node);
10528 else if (specs->long_p)
10529 specs->type = (specs->unsigned_p
10530 ? long_unsigned_type_node
10531 : long_integer_type_node);
10532 else if (specs->short_p)
10533 specs->type = (specs->unsigned_p
10534 ? short_unsigned_type_node
10535 : short_integer_type_node);
10537 specs->type = (specs->unsigned_p
10538 ? unsigned_type_node
10539 : integer_type_node);
10540 if (specs->complex_p)
10542 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10543 "ISO C does not support complex integer types");
10544 specs->type = build_complex_type (specs->type);
10548 gcc_assert (!specs->long_p && !specs->short_p
10549 && !specs->signed_p && !specs->unsigned_p);
10550 specs->type = (specs->complex_p
10551 ? complex_float_type_node
10552 : float_type_node);
10555 gcc_assert (!specs->long_long_p && !specs->short_p
10556 && !specs->signed_p && !specs->unsigned_p);
10559 specs->type = (specs->complex_p
10560 ? complex_long_double_type_node
10561 : long_double_type_node);
10565 specs->type = (specs->complex_p
10566 ? complex_double_type_node
10567 : double_type_node);
10572 case cts_dfloat128:
10573 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
10574 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
10575 if (specs->typespec_word == cts_dfloat32)
10576 specs->type = dfloat32_type_node;
10577 else if (specs->typespec_word == cts_dfloat64)
10578 specs->type = dfloat64_type_node;
10580 specs->type = dfloat128_type_node;
10583 gcc_assert (!specs->complex_p);
10584 if (!targetm.fixed_point_supported_p ())
10585 specs->type = integer_type_node;
10586 else if (specs->saturating_p)
10588 if (specs->long_long_p)
10589 specs->type = specs->unsigned_p
10590 ? sat_unsigned_long_long_fract_type_node
10591 : sat_long_long_fract_type_node;
10592 else if (specs->long_p)
10593 specs->type = specs->unsigned_p
10594 ? sat_unsigned_long_fract_type_node
10595 : sat_long_fract_type_node;
10596 else if (specs->short_p)
10597 specs->type = specs->unsigned_p
10598 ? sat_unsigned_short_fract_type_node
10599 : sat_short_fract_type_node;
10601 specs->type = specs->unsigned_p
10602 ? sat_unsigned_fract_type_node
10603 : sat_fract_type_node;
10607 if (specs->long_long_p)
10608 specs->type = specs->unsigned_p
10609 ? unsigned_long_long_fract_type_node
10610 : long_long_fract_type_node;
10611 else if (specs->long_p)
10612 specs->type = specs->unsigned_p
10613 ? unsigned_long_fract_type_node
10614 : long_fract_type_node;
10615 else if (specs->short_p)
10616 specs->type = specs->unsigned_p
10617 ? unsigned_short_fract_type_node
10618 : short_fract_type_node;
10620 specs->type = specs->unsigned_p
10621 ? unsigned_fract_type_node
10626 gcc_assert (!specs->complex_p);
10627 if (!targetm.fixed_point_supported_p ())
10628 specs->type = integer_type_node;
10629 else if (specs->saturating_p)
10631 if (specs->long_long_p)
10632 specs->type = specs->unsigned_p
10633 ? sat_unsigned_long_long_accum_type_node
10634 : sat_long_long_accum_type_node;
10635 else if (specs->long_p)
10636 specs->type = specs->unsigned_p
10637 ? sat_unsigned_long_accum_type_node
10638 : sat_long_accum_type_node;
10639 else if (specs->short_p)
10640 specs->type = specs->unsigned_p
10641 ? sat_unsigned_short_accum_type_node
10642 : sat_short_accum_type_node;
10644 specs->type = specs->unsigned_p
10645 ? sat_unsigned_accum_type_node
10646 : sat_accum_type_node;
10650 if (specs->long_long_p)
10651 specs->type = specs->unsigned_p
10652 ? unsigned_long_long_accum_type_node
10653 : long_long_accum_type_node;
10654 else if (specs->long_p)
10655 specs->type = specs->unsigned_p
10656 ? unsigned_long_accum_type_node
10657 : long_accum_type_node;
10658 else if (specs->short_p)
10659 specs->type = specs->unsigned_p
10660 ? unsigned_short_accum_type_node
10661 : short_accum_type_node;
10663 specs->type = specs->unsigned_p
10664 ? unsigned_accum_type_node
10669 gcc_unreachable ();
10675 /* Perform final processing on one file scope's declarations (or the
10676 external scope's declarations), GLOBALS. */
10679 c_write_global_declarations_1 (tree globals)
10684 /* Process the decls in the order they were written. */
10685 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10687 /* Check for used but undefined static functions using the C
10688 standard's definition of "used", and set TREE_NO_WARNING so
10689 that check_global_declaration doesn't repeat the check. */
10690 if (TREE_CODE (decl) == FUNCTION_DECL
10691 && DECL_INITIAL (decl) == 0
10692 && DECL_EXTERNAL (decl)
10693 && !TREE_PUBLIC (decl)
10694 && C_DECL_USED (decl))
10696 pedwarn (input_location, 0, "%q+F used but never defined", decl);
10697 TREE_NO_WARNING (decl) = 1;
10700 wrapup_global_declaration_1 (decl);
10705 reconsider = false;
10706 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10707 reconsider |= wrapup_global_declaration_2 (decl);
10709 while (reconsider);
10712 /* Callback to collect a source_ref from a DECL. */
10715 collect_source_ref_cb (tree decl)
10717 if (!DECL_IS_BUILTIN (decl))
10718 collect_source_ref (LOCATION_FILE (decl_sloc (decl, false)));
10721 /* Preserve the external declarations scope across a garbage collect. */
10722 static GTY(()) tree ext_block;
10724 /* Collect all references relevant to SOURCE_FILE. */
10727 collect_all_refs (const char *source_file)
10732 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10733 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file);
10735 collect_ada_nodes (BLOCK_VARS (ext_block), source_file);
10738 /* Iterate over all global declarations and call CALLBACK. */
10741 for_each_global_decl (void (*callback) (tree decl))
10748 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10750 decls = DECL_INITIAL (t);
10751 for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl))
10755 for (decl = BLOCK_VARS (ext_block); decl; decl = TREE_CHAIN (decl))
10759 /* Perform any final parser cleanups and generate initial debugging
10763 c_parse_final_cleanups (void)
10768 /* We don't want to do this if generating a PCH. */
10772 timevar_stop (TV_PHASE_PARSING);
10773 timevar_start (TV_PHASE_DEFERRED);
10775 /* Do the Objective-C stuff. This is where all the Objective-C
10776 module stuff gets generated (symtab, class/protocol/selector
10778 if (c_dialect_objc ())
10779 objc_write_global_declarations ();
10781 /* Close the external scope. */
10782 ext_block = pop_scope ();
10783 external_scope = 0;
10784 gcc_assert (!current_scope);
10786 /* Handle -fdump-ada-spec[-slim]. */
10787 if (flag_dump_ada_spec || flag_dump_ada_spec_slim)
10789 /* Build a table of files to generate specs for */
10790 if (flag_dump_ada_spec_slim)
10791 collect_source_ref (main_input_filename);
10793 for_each_global_decl (collect_source_ref_cb);
10795 dump_ada_specs (collect_all_refs, NULL);
10800 tree tmp = BLOCK_VARS (ext_block);
10802 FILE * stream = dump_begin (TDI_tu, &flags);
10805 dump_node (tmp, flags & ~TDF_SLIM, stream);
10806 dump_end (TDI_tu, stream);
10810 /* Process all file scopes in this compilation, and the external_scope,
10811 through wrapup_global_declarations. */
10812 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10813 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
10814 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
10816 timevar_stop (TV_PHASE_DEFERRED);
10817 timevar_start (TV_PHASE_PARSING);
10822 /* Register reserved keyword WORD as qualifier for address space AS. */
10825 c_register_addr_space (const char *word, addr_space_t as)
10827 int rid = RID_FIRST_ADDR_SPACE + as;
10830 /* Address space qualifiers are only supported
10831 in C with GNU extensions enabled. */
10832 if (c_dialect_objc () || flag_no_asm)
10835 id = get_identifier (word);
10836 C_SET_RID_CODE (id, rid);
10837 C_IS_RESERVED_WORD (id) = 1;
10838 ridpointers [rid] = id;
10841 /* Return identifier to look up for omp declare reduction. */
10844 c_omp_reduction_id (enum tree_code reduction_code, tree reduction_id)
10846 const char *p = NULL;
10847 switch (reduction_code)
10849 case PLUS_EXPR: p = "+"; break;
10850 case MULT_EXPR: p = "*"; break;
10851 case MINUS_EXPR: p = "-"; break;
10852 case BIT_AND_EXPR: p = "&"; break;
10853 case BIT_XOR_EXPR: p = "^"; break;
10854 case BIT_IOR_EXPR: p = "|"; break;
10855 case TRUTH_ANDIF_EXPR: p = "&&"; break;
10856 case TRUTH_ORIF_EXPR: p = "||"; break;
10857 case MIN_EXPR: p = "min"; break;
10858 case MAX_EXPR: p = "max"; break;
10865 if (TREE_CODE (reduction_id) != IDENTIFIER_NODE)
10866 return error_mark_node;
10867 p = IDENTIFIER_POINTER (reduction_id);
10870 const char prefix[] = "omp declare reduction ";
10871 size_t lenp = sizeof (prefix);
10872 size_t len = strlen (p);
10873 char *name = XALLOCAVEC (char, lenp + len);
10874 memcpy (name, prefix, lenp - 1);
10875 memcpy (name + lenp - 1, p, len + 1);
10876 return get_identifier (name);
10879 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10880 VAR_DECL, bind it into the current scope and return it. */
10883 c_omp_reduction_decl (tree reduction_id)
10885 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
10886 if (b != NULL && B_IN_CURRENT_SCOPE (b))
10889 tree decl = build_decl (BUILTINS_LOCATION, VAR_DECL,
10890 reduction_id, integer_type_node);
10891 DECL_ARTIFICIAL (decl) = 1;
10892 DECL_EXTERNAL (decl) = 1;
10893 TREE_STATIC (decl) = 1;
10894 TREE_PUBLIC (decl) = 0;
10895 bind (reduction_id, decl, current_scope, true, false, BUILTINS_LOCATION);
10899 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10902 c_omp_reduction_lookup (tree reduction_id, tree type)
10904 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
10908 for (t = DECL_INITIAL (b->decl); t; t = TREE_CHAIN (t))
10909 if (comptypes (TREE_PURPOSE (t), type))
10910 return TREE_VALUE (t);
10913 return error_mark_node;
10916 /* Helper function called via walk_tree, to diagnose invalid
10917 #pragma omp declare reduction combiners or initializers. */
10920 c_check_omp_declare_reduction_r (tree *tp, int *, void *data)
10922 tree *vars = (tree *) data;
10923 if (SSA_VAR_P (*tp)
10924 && !DECL_ARTIFICIAL (*tp)
10928 location_t loc = DECL_SOURCE_LOCATION (vars[0]);
10929 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars[0])), "omp_out") == 0)
10930 error_at (loc, "%<#pragma omp declare reduction%> combiner refers to "
10931 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10934 error_at (loc, "%<#pragma omp declare reduction%> initializer refers "
10935 "to variable %qD which is not %<omp_priv%> nor "
10943 #include "gt-c-c-decl.h"