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"
38 #include "double-int.h"
42 #include "fold-const.h"
43 #include "print-tree.h"
44 #include "stor-layout.h"
47 #include "stringpool.h"
48 #include "tree-inline.h"
54 #include "hard-reg-set.h"
64 #include "c-family/c-common.h"
65 #include "c-family/c-objc.h"
66 #include "c-family/c-pragma.h"
67 #include "c-family/c-ubsan.h"
69 #include "langhooks.h"
70 #include "tree-iterator.h"
71 #include "diagnostic-core.h"
75 #include "plugin-api.h"
78 #include "hash-table.h"
79 #include "langhooks-def.h"
81 #include "c-family/c-ada-spec.h"
85 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
87 { NORMAL, /* Ordinary declaration */
88 FUNCDEF, /* Function definition */
89 PARM, /* Declaration of parm before function body */
90 FIELD, /* Declaration inside struct or union */
91 TYPENAME}; /* Typename (inside cast or sizeof) */
93 /* States indicating how grokdeclarator() should handle declspecs marked
94 with __attribute__((deprecated)). An object declared as
95 __attribute__((deprecated)) suppresses warnings of uses of other
98 enum deprecated_states {
104 /* Nonzero if we have seen an invalid cross reference
105 to a struct, union, or enum, but not yet printed the message. */
106 tree pending_invalid_xref;
108 /* File and line to appear in the eventual error message. */
109 location_t pending_invalid_xref_location;
111 /* The file and line that the prototype came from if this is an
112 old-style definition; used for diagnostics in
113 store_parm_decls_oldstyle. */
115 static location_t current_function_prototype_locus;
117 /* Whether this prototype was built-in. */
119 static bool current_function_prototype_built_in;
121 /* The argument type information of this prototype. */
123 static tree current_function_prototype_arg_types;
125 /* The argument information structure for the function currently being
128 static struct c_arg_info *current_function_arg_info;
130 /* The obstack on which parser and related data structures, which are
131 not live beyond their top-level declaration or definition, are
133 struct obstack parser_obstack;
135 /* The current statement tree. */
137 static GTY(()) struct stmt_tree_s c_stmt_tree;
139 /* State saving variables. */
143 /* A list of decls to be made automatically visible in each file scope. */
144 static GTY(()) tree visible_builtins;
146 /* Set to 0 at beginning of a function definition, set to 1 if
147 a return statement that specifies a return value is seen. */
149 int current_function_returns_value;
151 /* Set to 0 at beginning of a function definition, set to 1 if
152 a return statement with no argument is seen. */
154 int current_function_returns_null;
156 /* Set to 0 at beginning of a function definition, set to 1 if
157 a call to a noreturn function is seen. */
159 int current_function_returns_abnormally;
161 /* Set to nonzero by `grokdeclarator' for a function
162 whose return type is defaulted, if warnings for this are desired. */
164 static int warn_about_return_type;
166 /* Nonzero when the current toplevel function contains a declaration
167 of a nested function which is never defined. */
169 static bool undef_nested_function;
171 /* Mode used to build pointers (VOIDmode means ptr_mode). */
173 machine_mode c_default_pointer_mode = VOIDmode;
175 /* If non-zero, implicit "omp declare target" attribute is added into the
177 int current_omp_declare_target_attribute;
179 /* Each c_binding structure describes one binding of an identifier to
180 a decl. All the decls in a scope - irrespective of namespace - are
181 chained together by the ->prev field, which (as the name implies)
182 runs in reverse order. All the decls in a given namespace bound to
183 a given identifier are chained by the ->shadowed field, which runs
184 from inner to outer scopes.
186 The ->decl field usually points to a DECL node, but there are two
187 exceptions. In the namespace of type tags, the bound entity is a
188 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
189 identifier is encountered, it is bound to error_mark_node to
190 suppress further errors about that identifier in the current
193 The ->u.type field stores the type of the declaration in this scope;
194 if NULL, the type is the type of the ->decl field. This is only of
195 relevance for objects with external or internal linkage which may
196 be redeclared in inner scopes, forming composite types that only
197 persist for the duration of those scopes. In the external scope,
198 this stores the composite of all the types declared for this
199 object, visible or not. The ->inner_comp field (used only at file
200 scope) stores whether an incomplete array type at file scope was
201 completed at an inner scope to an array size other than 1.
203 The ->u.label field is used for labels. It points to a structure
204 which stores additional information used for warnings.
206 The depth field is copied from the scope structure that holds this
207 decl. It is used to preserve the proper ordering of the ->shadowed
208 field (see bind()) and also for a handful of special-case checks.
209 Finally, the invisible bit is true for a decl which should be
210 ignored for purposes of normal name lookup, and the nested bit is
211 true for a decl that's been bound a second time in an inner scope;
212 in all such cases, the binding in the outer scope will have its
213 invisible bit true. */
215 struct GTY((chain_next ("%h.prev"))) c_binding {
216 union GTY(()) { /* first so GTY desc can use decl */
217 tree GTY((tag ("0"))) type; /* the type in this scope */
218 struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */
219 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u;
220 tree decl; /* the decl bound */
221 tree id; /* the identifier it's bound to */
222 struct c_binding *prev; /* the previous decl in this scope */
223 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
224 unsigned int depth : 28; /* depth of this scope */
225 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
226 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
227 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
228 BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */
229 location_t locus; /* location for nested bindings */
231 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
232 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
233 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
234 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
236 /* Each C symbol points to three linked lists of c_binding structures.
237 These describe the values of the identifier in the three different
238 namespaces defined by the language. */
240 struct GTY(()) lang_identifier {
241 struct c_common_identifier common_id;
242 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
243 struct c_binding *tag_binding; /* struct/union/enum tags */
244 struct c_binding *label_binding; /* labels */
247 /* Validate c-lang.c's assumptions. */
248 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
249 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
251 /* The binding oracle; see c-tree.h. */
252 void (*c_binding_oracle) (enum c_oracle_request, tree identifier);
254 /* This flag is set on an identifier if we have previously asked the
255 binding oracle for this identifier's symbol binding. */
256 #define I_SYMBOL_CHECKED(node) \
257 (TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (node)))
259 static inline struct c_binding* *
260 i_symbol_binding (tree node)
262 struct lang_identifier *lid
263 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
265 if (lid->symbol_binding == NULL
266 && c_binding_oracle != NULL
267 && !I_SYMBOL_CHECKED (node))
269 /* Set the "checked" flag first, to avoid infinite recursion
270 when the binding oracle calls back into gcc. */
271 I_SYMBOL_CHECKED (node) = 1;
272 c_binding_oracle (C_ORACLE_SYMBOL, node);
275 return &lid->symbol_binding;
278 #define I_SYMBOL_BINDING(node) (*i_symbol_binding (node))
280 #define I_SYMBOL_DECL(node) \
281 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
283 /* This flag is set on an identifier if we have previously asked the
284 binding oracle for this identifier's tag binding. */
285 #define I_TAG_CHECKED(node) \
286 (TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (node)))
288 static inline struct c_binding **
289 i_tag_binding (tree node)
291 struct lang_identifier *lid
292 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
294 if (lid->tag_binding == NULL
295 && c_binding_oracle != NULL
296 && !I_TAG_CHECKED (node))
298 /* Set the "checked" flag first, to avoid infinite recursion
299 when the binding oracle calls back into gcc. */
300 I_TAG_CHECKED (node) = 1;
301 c_binding_oracle (C_ORACLE_TAG, node);
304 return &lid->tag_binding;
307 #define I_TAG_BINDING(node) (*i_tag_binding (node))
309 #define I_TAG_DECL(node) \
310 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
312 /* This flag is set on an identifier if we have previously asked the
313 binding oracle for this identifier's label binding. */
314 #define I_LABEL_CHECKED(node) \
315 (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (node)))
317 static inline struct c_binding **
318 i_label_binding (tree node)
320 struct lang_identifier *lid
321 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
323 if (lid->label_binding == NULL
324 && c_binding_oracle != NULL
325 && !I_LABEL_CHECKED (node))
327 /* Set the "checked" flag first, to avoid infinite recursion
328 when the binding oracle calls back into gcc. */
329 I_LABEL_CHECKED (node) = 1;
330 c_binding_oracle (C_ORACLE_LABEL, node);
333 return &lid->label_binding;
336 #define I_LABEL_BINDING(node) (*i_label_binding (node))
338 #define I_LABEL_DECL(node) \
339 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
341 /* The resulting tree type. */
343 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
344 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
346 union tree_node GTY ((tag ("0"),
347 desc ("tree_node_structure (&%h)")))
349 struct lang_identifier GTY ((tag ("1"))) identifier;
352 /* Track bindings and other things that matter for goto warnings. For
353 efficiency, we do not gather all the decls at the point of
354 definition. Instead, we point into the bindings structure. As
355 scopes are popped, we update these structures and gather the decls
356 that matter at that time. */
358 struct GTY(()) c_spot_bindings {
359 /* The currently open scope which holds bindings defined when the
360 label was defined or the goto statement was found. */
361 struct c_scope *scope;
362 /* The bindings in the scope field which were defined at the point
363 of the label or goto. This lets us look at older or newer
364 bindings in the scope, as appropriate. */
365 struct c_binding *bindings_in_scope;
366 /* The number of statement expressions that have started since this
367 label or goto statement was defined. This is zero if we are at
368 the same statement expression level. It is positive if we are in
369 a statement expression started since this spot. It is negative
370 if this spot was in a statement expression and we have left
373 /* Whether we started in a statement expression but are no longer in
374 it. This is set to true if stmt_exprs ever goes negative. */
378 /* This structure is used to keep track of bindings seen when a goto
379 statement is defined. This is only used if we see the goto
380 statement before we see the label. */
382 struct GTY(()) c_goto_bindings {
383 /* The location of the goto statement. */
385 /* The bindings of the goto statement. */
386 struct c_spot_bindings goto_bindings;
389 typedef struct c_goto_bindings *c_goto_bindings_p;
391 /* The additional information we keep track of for a label binding.
392 These fields are updated as scopes are popped. */
394 struct GTY(()) c_label_vars {
395 /* The shadowed c_label_vars, when one label shadows another (which
396 can only happen using a __label__ declaration). */
397 struct c_label_vars *shadowed;
398 /* The bindings when the label was defined. */
399 struct c_spot_bindings label_bindings;
400 /* A list of decls that we care about: decls about which we should
401 warn if a goto branches to this label from later in the function.
402 Decls are added to this list as scopes are popped. We only add
403 the decls that matter. */
404 vec<tree, va_gc> *decls_in_scope;
405 /* A list of goto statements to this label. This is only used for
406 goto statements seen before the label was defined, so that we can
407 issue appropriate warnings for them. */
408 vec<c_goto_bindings_p, va_gc> *gotos;
411 /* Each c_scope structure describes the complete contents of one
412 scope. Four scopes are distinguished specially: the innermost or
413 current scope, the innermost function scope, the file scope (always
414 the second to outermost) and the outermost or external scope.
416 Most declarations are recorded in the current scope.
418 All normal label declarations are recorded in the innermost
419 function scope, as are bindings of undeclared identifiers to
420 error_mark_node. (GCC permits nested functions as an extension,
421 hence the 'innermost' qualifier.) Explicitly declared labels
422 (using the __label__ extension) appear in the current scope.
424 Being in the file scope (current_scope == file_scope) causes
425 special behavior in several places below. Also, under some
426 conditions the Objective-C front end records declarations in the
427 file scope even though that isn't the current scope.
429 All declarations with external linkage are recorded in the external
430 scope, even if they aren't visible there; this models the fact that
431 such declarations are visible to the entire program, and (with a
432 bit of cleverness, see pushdecl) allows diagnosis of some violations
433 of C99 6.2.2p7 and 6.2.7p2:
435 If, within the same translation unit, the same identifier appears
436 with both internal and external linkage, the behavior is
439 All declarations that refer to the same object or function shall
440 have compatible type; otherwise, the behavior is undefined.
442 Initially only the built-in declarations, which describe compiler
443 intrinsic functions plus a subset of the standard library, are in
446 The order of the blocks list matters, and it is frequently appended
447 to. To avoid having to walk all the way to the end of the list on
448 each insertion, or reverse the list later, we maintain a pointer to
449 the last list entry. (FIXME: It should be feasible to use a reversed
452 The bindings list is strictly in reverse order of declarations;
453 pop_scope relies on this. */
456 struct GTY((chain_next ("%h.outer"))) c_scope {
457 /* The scope containing this one. */
458 struct c_scope *outer;
460 /* The next outermost function scope. */
461 struct c_scope *outer_function;
463 /* All bindings in this scope. */
464 struct c_binding *bindings;
466 /* For each scope (except the global one), a chain of BLOCK nodes
467 for all the scopes that were entered and exited one level down. */
471 /* The depth of this scope. Used to keep the ->shadowed chain of
472 bindings sorted innermost to outermost. */
473 unsigned int depth : 28;
475 /* True if we are currently filling this scope with parameter
477 BOOL_BITFIELD parm_flag : 1;
479 /* True if we saw [*] in this scope. Used to give an error messages
480 if these appears in a function definition. */
481 BOOL_BITFIELD had_vla_unspec : 1;
483 /* True if we already complained about forward parameter decls
484 in this scope. This prevents double warnings on
485 foo (int a; int b; ...) */
486 BOOL_BITFIELD warned_forward_parm_decls : 1;
488 /* True if this is the outermost block scope of a function body.
489 This scope contains the parameters, the local variables declared
490 in the outermost block, and all the labels (except those in
491 nested functions, or declared at block scope with __label__). */
492 BOOL_BITFIELD function_body : 1;
494 /* True means make a BLOCK for this scope no matter what. */
495 BOOL_BITFIELD keep : 1;
497 /* True means that an unsuffixed float constant is _Decimal64. */
498 BOOL_BITFIELD float_const_decimal64 : 1;
500 /* True if this scope has any label bindings. This is used to speed
501 up searching for labels when popping scopes, particularly since
502 labels are normally only found at function scope. */
503 BOOL_BITFIELD has_label_bindings : 1;
505 /* True if we should issue a warning if a goto statement crosses any
506 of the bindings. We still need to check the list of bindings to
507 find the specific ones we need to warn about. This is true if
508 decl_jump_unsafe would return true for any of the bindings. This
509 is used to avoid looping over all the bindings unnecessarily. */
510 BOOL_BITFIELD has_jump_unsafe_decl : 1;
513 /* The scope currently in effect. */
515 static GTY(()) struct c_scope *current_scope;
517 /* The innermost function scope. Ordinary (not explicitly declared)
518 labels, bindings to error_mark_node, and the lazily-created
519 bindings of __func__ and its friends get this scope. */
521 static GTY(()) struct c_scope *current_function_scope;
523 /* The C file scope. This is reset for each input translation unit. */
525 static GTY(()) struct c_scope *file_scope;
527 /* The outermost scope. This is used for all declarations with
528 external linkage, and only these, hence the name. */
530 static GTY(()) struct c_scope *external_scope;
532 /* A chain of c_scope structures awaiting reuse. */
534 static GTY((deletable)) struct c_scope *scope_freelist;
536 /* A chain of c_binding structures awaiting reuse. */
538 static GTY((deletable)) struct c_binding *binding_freelist;
540 /* Append VAR to LIST in scope SCOPE. */
541 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
542 struct c_scope *s_ = (scope); \
544 if (s_->list##_last) \
545 BLOCK_CHAIN (s_->list##_last) = d_; \
548 s_->list##_last = d_; \
551 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
552 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
553 struct c_scope *t_ = (tscope); \
554 struct c_scope *f_ = (fscope); \
556 BLOCK_CHAIN (t_->to##_last) = f_->from; \
559 t_->to##_last = f_->from##_last; \
562 /* A c_inline_static structure stores details of a static identifier
563 referenced in a definition of a function that may be an inline
564 definition if no subsequent declaration of that function uses
565 "extern" or does not use "inline". */
567 struct GTY((chain_next ("%h.next"))) c_inline_static {
568 /* The location for a diagnostic. */
571 /* The function that may be an inline definition. */
574 /* The object or function referenced. */
577 /* What sort of reference this is. */
578 enum c_inline_static_type type;
580 /* The next such structure or NULL. */
581 struct c_inline_static *next;
584 /* List of static identifiers used or referenced in functions that may
585 be inline definitions. */
586 static GTY(()) struct c_inline_static *c_inline_statics;
588 /* True means unconditionally make a BLOCK for the next scope pushed. */
590 static bool keep_next_level_flag;
592 /* True means the next call to push_scope will be the outermost scope
593 of a function body, so do not push a new scope, merely cease
594 expecting parameter decls. */
596 static bool next_is_function_body;
598 /* A vector of pointers to c_binding structures. */
600 typedef struct c_binding *c_binding_ptr;
602 /* Information that we keep for a struct or union while it is being
605 struct c_struct_parse_info
607 /* If warn_cxx_compat, a list of types defined within this
609 vec<tree> struct_types;
610 /* If warn_cxx_compat, a list of field names which have bindings,
611 and which are defined in this struct, but which are not defined
612 in any enclosing struct. This is used to clear the in_struct
613 field of the c_bindings structure. */
614 vec<c_binding_ptr> fields;
615 /* If warn_cxx_compat, a list of typedef names used when defining
616 fields in this struct. */
617 vec<tree> typedefs_seen;
620 /* Information for the struct or union currently being parsed, or
621 NULL if not parsing a struct or union. */
622 static struct c_struct_parse_info *struct_parse_info;
624 /* Forward declarations. */
625 static tree lookup_name_in_scope (tree, struct c_scope *);
626 static tree c_make_fname_decl (location_t, tree, int);
627 static tree grokdeclarator (const struct c_declarator *,
628 struct c_declspecs *,
629 enum decl_context, bool, tree *, tree *, tree *,
630 bool *, enum deprecated_states);
631 static tree grokparms (struct c_arg_info *, bool);
632 static void layout_array_type (tree);
633 static void warn_defaults_to (location_t, int, const char *, ...)
634 ATTRIBUTE_GCC_DIAG(3,4);
636 /* T is a statement. Add it to the statement-tree. This is the
637 C/ObjC version--C++ has a slightly different version of this
643 enum tree_code code = TREE_CODE (t);
645 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
647 if (!EXPR_HAS_LOCATION (t))
648 SET_EXPR_LOCATION (t, input_location);
651 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
652 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
654 /* Add T to the statement-tree. Non-side-effect statements need to be
655 recorded during statement expressions. */
656 if (!building_stmt_list_p ())
658 append_to_statement_list_force (t, &cur_stmt_list);
663 /* Build a pointer type using the default pointer mode. */
666 c_build_pointer_type (tree to_type)
668 addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC
669 : TYPE_ADDR_SPACE (to_type);
670 machine_mode pointer_mode;
672 if (as != ADDR_SPACE_GENERIC || c_default_pointer_mode == VOIDmode)
673 pointer_mode = targetm.addr_space.pointer_mode (as);
675 pointer_mode = c_default_pointer_mode;
676 return build_pointer_type_for_mode (to_type, pointer_mode, false);
680 /* Return true if we will want to say something if a goto statement
684 decl_jump_unsafe (tree decl)
686 if (error_operand_p (decl))
689 /* Always warn about crossing variably modified types. */
690 if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == TYPE_DECL)
691 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
694 /* Otherwise, only warn if -Wgoto-misses-init and this is an
695 initialized automatic decl. */
696 if (warn_jump_misses_init
697 && TREE_CODE (decl) == VAR_DECL
698 && !TREE_STATIC (decl)
699 && DECL_INITIAL (decl) != NULL_TREE)
707 c_print_identifier (FILE *file, tree node, int indent)
709 void (*save) (enum c_oracle_request, tree identifier);
711 /* Temporarily hide any binding oracle. Without this, calls to
712 debug_tree from the debugger will end up calling into the oracle,
713 making for a confusing debug session. As the oracle isn't needed
714 here for normal operation, it's simplest to suppress it. */
715 save = c_binding_oracle;
716 c_binding_oracle = NULL;
718 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
719 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
720 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
721 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
723 tree rid = ridpointers[C_RID_CODE (node)];
724 indent_to (file, indent + 4);
725 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
726 (void *) rid, IDENTIFIER_POINTER (rid));
729 c_binding_oracle = save;
732 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
733 which may be any of several kinds of DECL or TYPE or error_mark_node,
734 in the scope SCOPE. */
736 bind (tree name, tree decl, struct c_scope *scope, bool invisible,
737 bool nested, location_t locus)
739 struct c_binding *b, **here;
741 if (binding_freelist)
743 b = binding_freelist;
744 binding_freelist = b->prev;
747 b = ggc_alloc<c_binding> ();
752 b->depth = scope->depth;
753 b->invisible = invisible;
761 b->prev = scope->bindings;
764 if (decl_jump_unsafe (decl))
765 scope->has_jump_unsafe_decl = 1;
770 switch (TREE_CODE (decl))
772 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
775 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
781 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
787 /* Locate the appropriate place in the chain of shadowed decls
788 to insert this binding. Normally, scope == current_scope and
789 this does nothing. */
790 while (*here && (*here)->depth > scope->depth)
791 here = &(*here)->shadowed;
797 /* Clear the binding structure B, stick it on the binding_freelist,
798 and return the former value of b->prev. This is used by pop_scope
799 and get_parm_info to iterate destructively over all the bindings
800 from a given scope. */
801 static struct c_binding *
802 free_binding_and_advance (struct c_binding *b)
804 struct c_binding *prev = b->prev;
806 memset (b, 0, sizeof (struct c_binding));
807 b->prev = binding_freelist;
808 binding_freelist = b;
813 /* Bind a label. Like bind, but skip fields which aren't used for
814 labels, and add the LABEL_VARS value. */
816 bind_label (tree name, tree label, struct c_scope *scope,
817 struct c_label_vars *label_vars)
821 bind (name, label, scope, /*invisible=*/false, /*nested=*/false,
824 scope->has_label_bindings = true;
827 gcc_assert (b->decl == label);
828 label_vars->shadowed = b->u.label;
829 b->u.label = label_vars;
832 /* Hook called at end of compilation to assume 1 elt
833 for a file-scope tentative array defn that wasn't complete before. */
836 c_finish_incomplete_decl (tree decl)
838 if (TREE_CODE (decl) == VAR_DECL)
840 tree type = TREE_TYPE (decl);
841 if (type != error_mark_node
842 && TREE_CODE (type) == ARRAY_TYPE
843 && !DECL_EXTERNAL (decl)
844 && TYPE_DOMAIN (type) == 0)
846 warning_at (DECL_SOURCE_LOCATION (decl),
847 0, "array %q+D assumed to have one element", decl);
849 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
851 relayout_decl (decl);
856 /* Record that inline function FUNC contains a reference (location
857 LOC) to static DECL (file-scope or function-local according to
861 record_inline_static (location_t loc, tree func, tree decl,
862 enum c_inline_static_type type)
864 c_inline_static *csi = ggc_alloc<c_inline_static> ();
866 csi->function = func;
867 csi->static_decl = decl;
869 csi->next = c_inline_statics;
870 c_inline_statics = csi;
873 /* Check for references to static declarations in inline functions at
874 the end of the translation unit and diagnose them if the functions
875 are still inline definitions. */
878 check_inline_statics (void)
880 struct c_inline_static *csi;
881 for (csi = c_inline_statics; csi; csi = csi->next)
883 if (DECL_EXTERNAL (csi->function))
887 pedwarn (csi->location, 0,
888 "%qD is static but used in inline function %qD "
889 "which is not static", csi->static_decl, csi->function);
892 pedwarn (csi->location, 0,
893 "%q+D is static but declared in inline function %qD "
894 "which is not static", csi->static_decl, csi->function);
900 c_inline_statics = NULL;
903 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
904 for the current state, otherwise set it to uninitialized. */
907 set_spot_bindings (struct c_spot_bindings *p, bool defining)
911 p->scope = current_scope;
912 p->bindings_in_scope = current_scope->bindings;
917 p->bindings_in_scope = NULL;
920 p->left_stmt_expr = false;
923 /* Update spot bindings P as we pop out of SCOPE. Return true if we
924 should push decls for a label. */
927 update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p)
929 if (p->scope != scope)
931 /* This label or goto is defined in some other scope, or it is a
932 label which is not yet defined. There is nothing to
937 /* Adjust the spot bindings to refer to the bindings already defined
938 in the enclosing scope. */
939 p->scope = scope->outer;
940 p->bindings_in_scope = p->scope->bindings;
945 /* The Objective-C front-end often needs to determine the current scope. */
948 objc_get_current_scope (void)
950 return current_scope;
953 /* The following function is used only by Objective-C. It needs to live here
954 because it accesses the innards of c_scope. */
957 objc_mark_locals_volatile (void *enclosing_blk)
959 struct c_scope *scope;
962 for (scope = current_scope;
963 scope && scope != enclosing_blk;
964 scope = scope->outer)
966 for (b = scope->bindings; b; b = b->prev)
967 objc_volatilize_decl (b->decl);
969 /* Do not climb up past the current function. */
970 if (scope->function_body)
975 /* Return true if we are in the global binding level. */
978 global_bindings_p (void)
980 return current_scope == file_scope;
984 keep_next_level (void)
986 keep_next_level_flag = true;
989 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
992 set_float_const_decimal64 (void)
994 current_scope->float_const_decimal64 = true;
997 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
1000 clear_float_const_decimal64 (void)
1002 current_scope->float_const_decimal64 = false;
1005 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
1008 float_const_decimal64_p (void)
1010 return current_scope->float_const_decimal64;
1013 /* Identify this scope as currently being filled with parameters. */
1016 declare_parm_level (void)
1018 current_scope->parm_flag = true;
1024 if (next_is_function_body)
1026 /* This is the transition from the parameters to the top level
1027 of the function body. These are the same scope
1028 (C99 6.2.1p4,6) so we do not push another scope structure.
1029 next_is_function_body is set only by store_parm_decls, which
1030 in turn is called when and only when we are about to
1031 encounter the opening curly brace for the function body.
1033 The outermost block of a function always gets a BLOCK node,
1034 because the debugging output routines expect that each
1035 function has at least one BLOCK. */
1036 current_scope->parm_flag = false;
1037 current_scope->function_body = true;
1038 current_scope->keep = true;
1039 current_scope->outer_function = current_function_scope;
1040 current_function_scope = current_scope;
1042 keep_next_level_flag = false;
1043 next_is_function_body = false;
1045 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1046 if (current_scope->outer)
1047 current_scope->float_const_decimal64
1048 = current_scope->outer->float_const_decimal64;
1050 current_scope->float_const_decimal64 = false;
1054 struct c_scope *scope;
1057 scope = scope_freelist;
1058 scope_freelist = scope->outer;
1061 scope = ggc_cleared_alloc<c_scope> ();
1063 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1065 scope->float_const_decimal64 = current_scope->float_const_decimal64;
1067 scope->float_const_decimal64 = false;
1069 scope->keep = keep_next_level_flag;
1070 scope->outer = current_scope;
1071 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
1073 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
1075 if (current_scope && scope->depth == 0)
1078 sorry ("GCC supports only %u nested scopes", scope->depth);
1081 current_scope = scope;
1082 keep_next_level_flag = false;
1086 /* This is called when we are leaving SCOPE. For each label defined
1087 in SCOPE, add any appropriate decls to its decls_in_scope fields.
1088 These are the decls whose initialization will be skipped by a goto
1089 later in the function. */
1092 update_label_decls (struct c_scope *scope)
1099 if (s->has_label_bindings)
1101 struct c_binding *b;
1103 for (b = s->bindings; b != NULL; b = b->prev)
1105 struct c_label_vars *label_vars;
1106 struct c_binding *b1;
1109 struct c_goto_bindings *g;
1111 if (TREE_CODE (b->decl) != LABEL_DECL)
1113 label_vars = b->u.label;
1115 b1 = label_vars->label_bindings.bindings_in_scope;
1116 if (label_vars->label_bindings.scope == NULL)
1119 hjud = label_vars->label_bindings.scope->has_jump_unsafe_decl;
1120 if (update_spot_bindings (scope, &label_vars->label_bindings))
1122 /* This label is defined in this scope. */
1125 for (; b1 != NULL; b1 = b1->prev)
1127 /* A goto from later in the function to this
1128 label will never see the initialization
1129 of B1, if any. Save it to issue a
1130 warning if needed. */
1131 if (decl_jump_unsafe (b1->decl))
1132 vec_safe_push(label_vars->decls_in_scope, b1->decl);
1137 /* Update the bindings of any goto statements associated
1139 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1140 update_spot_bindings (scope, &g->goto_bindings);
1144 /* Don't search beyond the current function. */
1145 if (s == current_function_scope)
1152 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1155 set_type_context (tree type, tree context)
1157 for (type = TYPE_MAIN_VARIANT (type); type;
1158 type = TYPE_NEXT_VARIANT (type))
1159 TYPE_CONTEXT (type) = context;
1162 /* Exit a scope. Restore the state of the identifier-decl mappings
1163 that were in effect when this scope was entered. Return a BLOCK
1164 node containing all the DECLs in this scope that are of interest
1165 to debug info generation. */
1170 struct c_scope *scope = current_scope;
1171 tree block, context, p;
1172 struct c_binding *b;
1174 bool functionbody = scope->function_body;
1175 bool keep = functionbody || scope->keep || scope->bindings;
1177 update_label_decls (scope);
1179 /* If appropriate, create a BLOCK to record the decls for the life
1180 of this function. */
1184 block = make_node (BLOCK);
1185 BLOCK_SUBBLOCKS (block) = scope->blocks;
1186 TREE_USED (block) = 1;
1188 /* In each subblock, record that this is its superior. */
1189 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
1190 BLOCK_SUPERCONTEXT (p) = block;
1192 BLOCK_VARS (block) = 0;
1195 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1196 scope must be set so that they point to the appropriate
1197 construct, i.e. either to the current FUNCTION_DECL node, or
1198 else to the BLOCK node we just constructed.
1200 Note that for tagged types whose scope is just the formal
1201 parameter list for some function type specification, we can't
1202 properly set their TYPE_CONTEXTs here, because we don't have a
1203 pointer to the appropriate FUNCTION_TYPE node readily available
1204 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1205 type nodes get set in `grokdeclarator' as soon as we have created
1206 the FUNCTION_TYPE node which will represent the "scope" for these
1207 "parameter list local" tagged types. */
1208 if (scope->function_body)
1209 context = current_function_decl;
1210 else if (scope == file_scope)
1212 tree file_decl = build_translation_unit_decl (NULL_TREE);
1213 context = file_decl;
1218 /* Clear all bindings in this scope. */
1219 for (b = scope->bindings; b; b = free_binding_and_advance (b))
1222 switch (TREE_CODE (p))
1225 /* Warnings for unused labels, errors for undefined labels. */
1226 if (TREE_USED (p) && !DECL_INITIAL (p))
1228 error ("label %q+D used but not defined", p);
1229 DECL_INITIAL (p) = error_mark_node;
1232 warn_for_unused_label (p);
1234 /* Labels go in BLOCK_VARS. */
1235 DECL_CHAIN (p) = BLOCK_VARS (block);
1236 BLOCK_VARS (block) = p;
1237 gcc_assert (I_LABEL_BINDING (b->id) == b);
1238 I_LABEL_BINDING (b->id) = b->shadowed;
1240 /* Also pop back to the shadowed label_vars. */
1241 release_tree_vector (b->u.label->decls_in_scope);
1242 b->u.label = b->u.label->shadowed;
1248 set_type_context (p, context);
1250 /* Types may not have tag-names, in which case the type
1251 appears in the bindings list with b->id NULL. */
1254 gcc_assert (I_TAG_BINDING (b->id) == b);
1255 I_TAG_BINDING (b->id) = b->shadowed;
1260 /* Propagate TREE_ADDRESSABLE from nested functions to their
1261 containing functions. */
1262 if (!TREE_ASM_WRITTEN (p)
1263 && DECL_INITIAL (p) != 0
1264 && TREE_ADDRESSABLE (p)
1265 && DECL_ABSTRACT_ORIGIN (p) != 0
1266 && DECL_ABSTRACT_ORIGIN (p) != p)
1267 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
1268 if (!DECL_EXTERNAL (p)
1269 && !DECL_INITIAL (p)
1270 && scope != file_scope
1271 && scope != external_scope)
1273 error ("nested function %q+D declared but never defined", p);
1274 undef_nested_function = true;
1276 else if (DECL_DECLARED_INLINE_P (p)
1278 && !DECL_INITIAL (p))
1280 /* C99 6.7.4p6: "a function with external linkage... declared
1281 with an inline function specifier ... shall also be defined
1282 in the same translation unit." */
1283 if (!flag_gnu89_inline
1284 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (p))
1285 && scope != external_scope)
1286 pedwarn (input_location, 0,
1287 "inline function %q+D declared but never defined", p);
1288 DECL_EXTERNAL (p) = 1;
1294 /* Warnings for unused variables. */
1295 if ((!TREE_USED (p) || !DECL_READ_P (p))
1296 && !TREE_NO_WARNING (p)
1297 && !DECL_IN_SYSTEM_HEADER (p)
1299 && !DECL_ARTIFICIAL (p)
1300 && scope != file_scope
1301 && scope != external_scope)
1304 warning (OPT_Wunused_variable, "unused variable %q+D", p);
1305 else if (DECL_CONTEXT (p) == current_function_decl)
1306 warning_at (DECL_SOURCE_LOCATION (p),
1307 OPT_Wunused_but_set_variable,
1308 "variable %qD set but not used", p);
1313 error ("type of array %q+D completed incompatibly with"
1314 " implicit initialization", p);
1321 /* All of these go in BLOCK_VARS, but only if this is the
1322 binding in the home scope. */
1325 DECL_CHAIN (p) = BLOCK_VARS (block);
1326 BLOCK_VARS (block) = p;
1328 else if (VAR_OR_FUNCTION_DECL_P (p) && scope != file_scope)
1330 /* For block local externs add a special
1331 DECL_EXTERNAL decl for debug info generation. */
1332 tree extp = copy_node (p);
1334 DECL_EXTERNAL (extp) = 1;
1335 TREE_STATIC (extp) = 0;
1336 TREE_PUBLIC (extp) = 1;
1337 DECL_INITIAL (extp) = NULL_TREE;
1338 DECL_LANG_SPECIFIC (extp) = NULL;
1339 DECL_CONTEXT (extp) = current_function_decl;
1340 if (TREE_CODE (p) == FUNCTION_DECL)
1342 DECL_RESULT (extp) = NULL_TREE;
1343 DECL_SAVED_TREE (extp) = NULL_TREE;
1344 DECL_STRUCT_FUNCTION (extp) = NULL;
1346 if (b->locus != UNKNOWN_LOCATION)
1347 DECL_SOURCE_LOCATION (extp) = b->locus;
1348 DECL_CHAIN (extp) = BLOCK_VARS (block);
1349 BLOCK_VARS (block) = extp;
1351 /* If this is the file scope set DECL_CONTEXT of each decl to
1352 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1354 if (scope == file_scope)
1356 DECL_CONTEXT (p) = context;
1357 if (TREE_CODE (p) == TYPE_DECL
1358 && TREE_TYPE (p) != error_mark_node)
1359 set_type_context (TREE_TYPE (p), context);
1363 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1364 already been put there by store_parm_decls. Unused-
1365 parameter warnings are handled by function.c.
1366 error_mark_node obviously does not go in BLOCK_VARS and
1367 does not get unused-variable warnings. */
1370 /* It is possible for a decl not to have a name. We get
1371 here with b->id NULL in this case. */
1374 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
1375 I_SYMBOL_BINDING (b->id) = b->shadowed;
1376 if (b->shadowed && b->shadowed->u.type)
1377 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
1387 /* Dispose of the block that we just made inside some higher level. */
1388 if ((scope->function_body || scope == file_scope) && context)
1390 DECL_INITIAL (context) = block;
1391 BLOCK_SUPERCONTEXT (block) = context;
1393 else if (scope->outer)
1396 SCOPE_LIST_APPEND (scope->outer, blocks, block);
1397 /* If we did not make a block for the scope just exited, any
1398 blocks made for inner scopes must be carried forward so they
1399 will later become subblocks of something else. */
1400 else if (scope->blocks)
1401 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
1404 /* Pop the current scope, and free the structure for reuse. */
1405 current_scope = scope->outer;
1406 if (scope->function_body)
1407 current_function_scope = scope->outer_function;
1409 memset (scope, 0, sizeof (struct c_scope));
1410 scope->outer = scope_freelist;
1411 scope_freelist = scope;
1417 push_file_scope (void)
1425 file_scope = current_scope;
1427 start_fname_decls ();
1429 for (decl = visible_builtins; decl; decl = DECL_CHAIN (decl))
1430 bind (DECL_NAME (decl), decl, file_scope,
1431 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl));
1435 pop_file_scope (void)
1437 /* In case there were missing closebraces, get us back to the global
1439 while (current_scope != file_scope)
1442 /* __FUNCTION__ is defined at file scope (""). This
1443 call may not be necessary as my tests indicate it
1444 still works without it. */
1445 finish_fname_decls ();
1447 check_inline_statics ();
1449 /* This is the point to write out a PCH if we're doing that.
1450 In that case we do not want to do anything else. */
1453 c_common_write_pch ();
1457 /* Pop off the file scope and close this translation unit. */
1461 maybe_apply_pending_pragma_weaks ();
1464 /* Adjust the bindings for the start of a statement expression. */
1467 c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings)
1469 struct c_scope *scope;
1471 for (scope = current_scope; scope != NULL; scope = scope->outer)
1473 struct c_binding *b;
1475 if (!scope->has_label_bindings)
1478 for (b = scope->bindings; b != NULL; b = b->prev)
1480 struct c_label_vars *label_vars;
1482 struct c_goto_bindings *g;
1484 if (TREE_CODE (b->decl) != LABEL_DECL)
1486 label_vars = b->u.label;
1487 ++label_vars->label_bindings.stmt_exprs;
1488 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1489 ++g->goto_bindings.stmt_exprs;
1493 if (switch_bindings != NULL)
1494 ++switch_bindings->stmt_exprs;
1497 /* Adjust the bindings for the end of a statement expression. */
1500 c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings)
1502 struct c_scope *scope;
1504 for (scope = current_scope; scope != NULL; scope = scope->outer)
1506 struct c_binding *b;
1508 if (!scope->has_label_bindings)
1511 for (b = scope->bindings; b != NULL; b = b->prev)
1513 struct c_label_vars *label_vars;
1515 struct c_goto_bindings *g;
1517 if (TREE_CODE (b->decl) != LABEL_DECL)
1519 label_vars = b->u.label;
1520 --label_vars->label_bindings.stmt_exprs;
1521 if (label_vars->label_bindings.stmt_exprs < 0)
1523 label_vars->label_bindings.left_stmt_expr = true;
1524 label_vars->label_bindings.stmt_exprs = 0;
1526 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1528 --g->goto_bindings.stmt_exprs;
1529 if (g->goto_bindings.stmt_exprs < 0)
1531 g->goto_bindings.left_stmt_expr = true;
1532 g->goto_bindings.stmt_exprs = 0;
1538 if (switch_bindings != NULL)
1540 --switch_bindings->stmt_exprs;
1541 gcc_assert (switch_bindings->stmt_exprs >= 0);
1545 /* Push a definition or a declaration of struct, union or enum tag "name".
1546 "type" should be the type node.
1547 We assume that the tag "name" is not already defined, and has a location
1550 Note that the definition may really be just a forward reference.
1551 In that case, the TYPE_SIZE will be zero. */
1554 pushtag (location_t loc, tree name, tree type)
1556 /* Record the identifier as the type's name if it has none. */
1557 if (name && !TYPE_NAME (type))
1558 TYPE_NAME (type) = name;
1559 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc);
1561 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1562 tagged type we just added to the current scope. This fake
1563 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1564 to output a representation of a tagged type, and it also gives
1565 us a convenient place to record the "scope start" address for the
1568 TYPE_STUB_DECL (type) = pushdecl (build_decl (loc,
1569 TYPE_DECL, NULL_TREE, type));
1571 /* An approximation for now, so we can tell this is a function-scope tag.
1572 This will be updated in pop_scope. */
1573 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1575 if (warn_cxx_compat && name != NULL_TREE)
1577 struct c_binding *b = I_SYMBOL_BINDING (name);
1580 && b->decl != NULL_TREE
1581 && TREE_CODE (b->decl) == TYPE_DECL
1582 && (B_IN_CURRENT_SCOPE (b)
1583 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
1584 && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl))
1585 != TYPE_MAIN_VARIANT (type)))
1587 warning_at (loc, OPT_Wc___compat,
1588 ("using %qD as both a typedef and a tag is "
1591 if (b->locus != UNKNOWN_LOCATION)
1592 inform (b->locus, "originally defined here");
1597 /* An exported interface to pushtag. This is used by the gdb plugin's
1598 binding oracle to introduce a new tag binding. */
1601 c_pushtag (location_t loc, tree name, tree type)
1603 pushtag (loc, name, type);
1606 /* An exported interface to bind a declaration. LOC is the location
1607 to use. DECL is the declaration to bind. The decl's name is used
1608 to determine how it is bound. If DECL is a VAR_DECL, then
1609 IS_GLOBAL determines whether the decl is put into the global (file
1610 and external) scope or the current function's scope; if DECL is not
1611 a VAR_DECL then it is always put into the file scope. */
1614 c_bind (location_t loc, tree decl, bool is_global)
1616 struct c_scope *scope;
1617 bool nested = false;
1619 if (TREE_CODE (decl) != VAR_DECL || current_function_scope == NULL)
1621 /* Types and functions are always considered to be global. */
1623 DECL_EXTERNAL (decl) = 1;
1624 TREE_PUBLIC (decl) = 1;
1628 /* Also bind it into the external scope. */
1629 bind (DECL_NAME (decl), decl, external_scope, true, false, loc);
1632 DECL_EXTERNAL (decl) = 1;
1633 TREE_PUBLIC (decl) = 1;
1637 DECL_CONTEXT (decl) = current_function_decl;
1638 TREE_PUBLIC (decl) = 0;
1639 scope = current_function_scope;
1642 bind (DECL_NAME (decl), decl, scope, false, nested, loc);
1645 /* Subroutine of compare_decls. Allow harmless mismatches in return
1646 and argument types provided that the type modes match. This function
1647 return a unified type given a suitable match, and 0 otherwise. */
1650 match_builtin_function_types (tree newtype, tree oldtype)
1652 tree newrettype, oldrettype;
1653 tree newargs, oldargs;
1654 tree trytype, tryargs;
1656 /* Accept the return type of the new declaration if same modes. */
1657 oldrettype = TREE_TYPE (oldtype);
1658 newrettype = TREE_TYPE (newtype);
1660 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1663 oldargs = TYPE_ARG_TYPES (oldtype);
1664 newargs = TYPE_ARG_TYPES (newtype);
1667 while (oldargs || newargs)
1671 || !TREE_VALUE (oldargs)
1672 || !TREE_VALUE (newargs)
1673 || TYPE_MODE (TREE_VALUE (oldargs))
1674 != TYPE_MODE (TREE_VALUE (newargs)))
1677 oldargs = TREE_CHAIN (oldargs);
1678 newargs = TREE_CHAIN (newargs);
1681 trytype = build_function_type (newrettype, tryargs);
1682 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1685 /* Subroutine of diagnose_mismatched_decls. Check for function type
1686 mismatch involving an empty arglist vs a nonempty one and give clearer
1689 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1690 tree newtype, tree oldtype)
1694 if (TREE_CODE (olddecl) != FUNCTION_DECL
1695 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1696 || !((!prototype_p (oldtype) && DECL_INITIAL (olddecl) == 0)
1697 || (!prototype_p (newtype) && DECL_INITIAL (newdecl) == 0)))
1700 t = TYPE_ARG_TYPES (oldtype);
1702 t = TYPE_ARG_TYPES (newtype);
1703 for (; t; t = TREE_CHAIN (t))
1705 tree type = TREE_VALUE (t);
1707 if (TREE_CHAIN (t) == 0
1708 && TYPE_MAIN_VARIANT (type) != void_type_node)
1710 inform (input_location, "a parameter list with an ellipsis can%'t match "
1711 "an empty parameter name list declaration");
1715 if (c_type_promotes_to (type) != type)
1717 inform (input_location, "an argument type that has a default promotion can%'t match "
1718 "an empty parameter name list declaration");
1724 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1725 old-style function definition, NEWDECL is a prototype declaration.
1726 Diagnose inconsistencies in the argument list. Returns TRUE if
1727 the prototype is compatible, FALSE if not. */
1729 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1731 tree newargs, oldargs;
1734 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1736 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1737 newargs = TYPE_ARG_TYPES (newtype);
1742 tree oldargtype = TREE_VALUE (oldargs);
1743 tree newargtype = TREE_VALUE (newargs);
1745 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1748 oldargtype = (TYPE_ATOMIC (oldargtype)
1749 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype),
1751 : TYPE_MAIN_VARIANT (oldargtype));
1752 newargtype = (TYPE_ATOMIC (newargtype)
1753 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype),
1755 : TYPE_MAIN_VARIANT (newargtype));
1757 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1760 /* Reaching the end of just one list means the two decls don't
1761 agree on the number of arguments. */
1762 if (END_OF_ARGLIST (oldargtype))
1764 error ("prototype for %q+D declares more arguments "
1765 "than previous old-style definition", newdecl);
1768 else if (END_OF_ARGLIST (newargtype))
1770 error ("prototype for %q+D declares fewer arguments "
1771 "than previous old-style definition", newdecl);
1775 /* Type for passing arg must be consistent with that declared
1777 else if (!comptypes (oldargtype, newargtype))
1779 error ("prototype for %q+D declares argument %d"
1780 " with incompatible type",
1785 oldargs = TREE_CHAIN (oldargs);
1786 newargs = TREE_CHAIN (newargs);
1790 /* If we get here, no errors were found, but do issue a warning
1791 for this poor-style construct. */
1792 warning (0, "prototype for %q+D follows non-prototype definition",
1795 #undef END_OF_ARGLIST
1798 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1799 first in a pair of mismatched declarations, using the diagnostic
1802 locate_old_decl (tree decl)
1804 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)
1805 && !C_DECL_DECLARED_BUILTIN (decl))
1807 else if (DECL_INITIAL (decl))
1808 inform (input_location, "previous definition of %q+D was here", decl);
1809 else if (C_DECL_IMPLICIT (decl))
1810 inform (input_location, "previous implicit declaration of %q+D was here", decl);
1812 inform (input_location, "previous declaration of %q+D was here", decl);
1815 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1816 Returns true if the caller should proceed to merge the two, false
1817 if OLDDECL should simply be discarded. As a side effect, issues
1818 all necessary diagnostics for invalid or poor-style combinations.
1819 If it returns true, writes the types of NEWDECL and OLDDECL to
1820 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1821 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1824 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1825 tree *newtypep, tree *oldtypep)
1827 tree newtype, oldtype;
1828 bool pedwarned = false;
1829 bool warned = false;
1832 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1833 && DECL_EXTERNAL (DECL))
1835 /* If we have error_mark_node for either decl or type, just discard
1836 the previous decl - we're in an error cascade already. */
1837 if (olddecl == error_mark_node || newdecl == error_mark_node)
1839 *oldtypep = oldtype = TREE_TYPE (olddecl);
1840 *newtypep = newtype = TREE_TYPE (newdecl);
1841 if (oldtype == error_mark_node || newtype == error_mark_node)
1844 /* Two different categories of symbol altogether. This is an error
1845 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1846 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1848 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1849 && DECL_BUILT_IN (olddecl)
1850 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1852 error ("%q+D redeclared as different kind of symbol", newdecl);
1853 locate_old_decl (olddecl);
1855 else if (TREE_PUBLIC (newdecl))
1856 warning (0, "built-in function %q+D declared as non-function",
1859 warning (OPT_Wshadow, "declaration of %q+D shadows "
1860 "a built-in function", newdecl);
1864 /* Enumerators have no linkage, so may only be declared once in a
1866 if (TREE_CODE (olddecl) == CONST_DECL)
1868 error ("redeclaration of enumerator %q+D", newdecl);
1869 locate_old_decl (olddecl);
1873 if (!comptypes (oldtype, newtype))
1875 if (TREE_CODE (olddecl) == FUNCTION_DECL
1876 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1878 /* Accept harmless mismatch in function types.
1879 This is for the ffs and fprintf builtins. */
1880 tree trytype = match_builtin_function_types (newtype, oldtype);
1882 if (trytype && comptypes (newtype, trytype))
1883 *oldtypep = oldtype = trytype;
1886 /* If types don't match for a built-in, throw away the
1887 built-in. No point in calling locate_old_decl here, it
1888 won't print anything. */
1889 warning (0, "conflicting types for built-in function %q+D",
1894 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1895 && DECL_IS_BUILTIN (olddecl))
1897 /* A conflicting function declaration for a predeclared
1898 function that isn't actually built in. Objective C uses
1899 these. The new declaration silently overrides everything
1900 but the volatility (i.e. noreturn) indication. See also
1901 below. FIXME: Make Objective C use normal builtins. */
1902 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1905 /* Permit void foo (...) to match int foo (...) if the latter is
1906 the definition and implicit int was used. See
1907 c-torture/compile/920625-2.c. */
1908 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1909 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1910 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1911 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1913 pedwarned = pedwarn (input_location, 0,
1914 "conflicting types for %q+D", newdecl);
1915 /* Make sure we keep void as the return type. */
1916 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1917 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1919 /* Permit void foo (...) to match an earlier call to foo (...) with
1920 no declared type (thus, implicitly int). */
1921 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1922 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1923 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1924 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1926 pedwarned = pedwarn (input_location, 0,
1927 "conflicting types for %q+D", newdecl);
1928 /* Make sure we keep void as the return type. */
1929 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1933 int new_quals = TYPE_QUALS (newtype);
1934 int old_quals = TYPE_QUALS (oldtype);
1936 if (new_quals != old_quals)
1938 addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals);
1939 addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals);
1940 if (new_addr != old_addr)
1942 if (ADDR_SPACE_GENERIC_P (new_addr))
1943 error ("conflicting named address spaces (generic vs %s) "
1945 c_addr_space_name (old_addr), newdecl);
1946 else if (ADDR_SPACE_GENERIC_P (old_addr))
1947 error ("conflicting named address spaces (%s vs generic) "
1949 c_addr_space_name (new_addr), newdecl);
1951 error ("conflicting named address spaces (%s vs %s) "
1953 c_addr_space_name (new_addr),
1954 c_addr_space_name (old_addr),
1958 if (CLEAR_QUAL_ADDR_SPACE (new_quals)
1959 != CLEAR_QUAL_ADDR_SPACE (old_quals))
1960 error ("conflicting type qualifiers for %q+D", newdecl);
1963 error ("conflicting types for %q+D", newdecl);
1964 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1965 locate_old_decl (olddecl);
1970 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1971 but silently ignore the redeclaration if either is in a system
1972 header. (Conflicting redeclarations were handled above.) This
1973 is allowed for C11 if the types are the same, not just
1975 if (TREE_CODE (newdecl) == TYPE_DECL)
1977 bool types_different = false;
1978 int comptypes_result;
1981 = comptypes_check_different_types (oldtype, newtype, &types_different);
1983 if (comptypes_result != 1 || types_different)
1985 error ("redefinition of typedef %q+D with different type", newdecl);
1986 locate_old_decl (olddecl);
1990 if (DECL_IN_SYSTEM_HEADER (newdecl)
1991 || DECL_IN_SYSTEM_HEADER (olddecl)
1992 || TREE_NO_WARNING (newdecl)
1993 || TREE_NO_WARNING (olddecl))
1994 return true; /* Allow OLDDECL to continue in use. */
1996 if (variably_modified_type_p (newtype, NULL))
1998 error ("redefinition of typedef %q+D with variably modified type",
2000 locate_old_decl (olddecl);
2002 else if (pedwarn_c99 (input_location, OPT_Wpedantic,
2003 "redefinition of typedef %q+D", newdecl))
2004 locate_old_decl (olddecl);
2009 /* Function declarations can either be 'static' or 'extern' (no
2010 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
2011 can never conflict with each other on account of linkage
2012 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
2013 gnu89 mode permits two definitions if one is 'extern inline' and
2014 one is not. The non- extern-inline definition supersedes the
2015 extern-inline definition. */
2017 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2019 /* If you declare a built-in function name as static, or
2020 define the built-in with an old-style definition (so we
2021 can't validate the argument list) the built-in definition is
2022 overridden, but optionally warn this was a bad choice of name. */
2023 if (DECL_BUILT_IN (olddecl)
2024 && !C_DECL_DECLARED_BUILTIN (olddecl)
2025 && (!TREE_PUBLIC (newdecl)
2026 || (DECL_INITIAL (newdecl)
2027 && !prototype_p (TREE_TYPE (newdecl)))))
2029 warning (OPT_Wshadow, "declaration of %q+D shadows "
2030 "a built-in function", newdecl);
2031 /* Discard the old built-in function. */
2035 if (DECL_INITIAL (newdecl))
2037 if (DECL_INITIAL (olddecl))
2039 /* If both decls are in the same TU and the new declaration
2040 isn't overriding an extern inline reject the new decl.
2041 In c99, no overriding is allowed in the same translation
2043 if ((!DECL_EXTERN_INLINE (olddecl)
2044 || DECL_EXTERN_INLINE (newdecl)
2045 || (!flag_gnu89_inline
2046 && (!DECL_DECLARED_INLINE_P (olddecl)
2047 || !lookup_attribute ("gnu_inline",
2048 DECL_ATTRIBUTES (olddecl)))
2049 && (!DECL_DECLARED_INLINE_P (newdecl)
2050 || !lookup_attribute ("gnu_inline",
2051 DECL_ATTRIBUTES (newdecl))))
2053 && same_translation_unit_p (newdecl, olddecl))
2055 error ("redefinition of %q+D", newdecl);
2056 locate_old_decl (olddecl);
2061 /* If we have a prototype after an old-style function definition,
2062 the argument types must be checked specially. */
2063 else if (DECL_INITIAL (olddecl)
2064 && !prototype_p (oldtype) && prototype_p (newtype)
2065 && TYPE_ACTUAL_ARG_TYPES (oldtype)
2066 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
2068 locate_old_decl (olddecl);
2071 /* A non-static declaration (even an "extern") followed by a
2072 static declaration is undefined behavior per C99 6.2.2p3-5,7.
2073 The same is true for a static forward declaration at block
2074 scope followed by a non-static declaration/definition at file
2075 scope. Static followed by non-static at the same scope is
2076 not undefined behavior, and is the most convenient way to get
2077 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
2078 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
2079 we do diagnose it if -Wtraditional. */
2080 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
2082 /* Two exceptions to the rule. If olddecl is an extern
2083 inline, or a predeclared function that isn't actually
2084 built in, newdecl silently overrides olddecl. The latter
2085 occur only in Objective C; see also above. (FIXME: Make
2086 Objective C use normal builtins.) */
2087 if (!DECL_IS_BUILTIN (olddecl)
2088 && !DECL_EXTERN_INLINE (olddecl))
2090 error ("static declaration of %q+D follows "
2091 "non-static declaration", newdecl);
2092 locate_old_decl (olddecl);
2096 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
2098 if (DECL_CONTEXT (olddecl))
2100 error ("non-static declaration of %q+D follows "
2101 "static declaration", newdecl);
2102 locate_old_decl (olddecl);
2105 else if (warn_traditional)
2107 warned |= warning (OPT_Wtraditional,
2108 "non-static declaration of %q+D "
2109 "follows static declaration", newdecl);
2113 /* Make sure gnu_inline attribute is either not present, or
2114 present on all inline decls. */
2115 if (DECL_DECLARED_INLINE_P (olddecl)
2116 && DECL_DECLARED_INLINE_P (newdecl))
2118 bool newa = lookup_attribute ("gnu_inline",
2119 DECL_ATTRIBUTES (newdecl)) != NULL;
2120 bool olda = lookup_attribute ("gnu_inline",
2121 DECL_ATTRIBUTES (olddecl)) != NULL;
2124 error_at (input_location, "%<gnu_inline%> attribute present on %q+D",
2125 newa ? newdecl : olddecl);
2126 error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl),
2131 else if (TREE_CODE (newdecl) == VAR_DECL)
2133 /* Only variables can be thread-local, and all declarations must
2134 agree on this property. */
2135 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
2137 /* Nothing to check. Since OLDDECL is marked threadprivate
2138 and NEWDECL does not have a thread-local attribute, we
2139 will merge the threadprivate attribute into NEWDECL. */
2142 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
2144 if (DECL_THREAD_LOCAL_P (newdecl))
2145 error ("thread-local declaration of %q+D follows "
2146 "non-thread-local declaration", newdecl);
2148 error ("non-thread-local declaration of %q+D follows "
2149 "thread-local declaration", newdecl);
2151 locate_old_decl (olddecl);
2155 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2156 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
2158 error ("redefinition of %q+D", newdecl);
2159 locate_old_decl (olddecl);
2163 /* Objects declared at file scope: if the first declaration had
2164 external linkage (even if it was an external reference) the
2165 second must have external linkage as well, or the behavior is
2166 undefined. If the first declaration had internal linkage, then
2167 the second must too, or else be an external reference (in which
2168 case the composite declaration still has internal linkage).
2169 As for function declarations, we warn about the static-then-
2170 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2171 if (DECL_FILE_SCOPE_P (newdecl)
2172 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
2174 if (DECL_EXTERNAL (newdecl))
2176 if (!DECL_FILE_SCOPE_P (olddecl))
2178 error ("extern declaration of %q+D follows "
2179 "declaration with no linkage", newdecl);
2180 locate_old_decl (olddecl);
2183 else if (warn_traditional)
2185 warned |= warning (OPT_Wtraditional,
2186 "non-static declaration of %q+D "
2187 "follows static declaration", newdecl);
2192 if (TREE_PUBLIC (newdecl))
2193 error ("non-static declaration of %q+D follows "
2194 "static declaration", newdecl);
2196 error ("static declaration of %q+D follows "
2197 "non-static declaration", newdecl);
2199 locate_old_decl (olddecl);
2203 /* Two objects with the same name declared at the same block
2204 scope must both be external references (6.7p3). */
2205 else if (!DECL_FILE_SCOPE_P (newdecl))
2207 if (DECL_EXTERNAL (newdecl))
2209 /* Extern with initializer at block scope, which will
2210 already have received an error. */
2212 else if (DECL_EXTERNAL (olddecl))
2214 error ("declaration of %q+D with no linkage follows "
2215 "extern declaration", newdecl);
2216 locate_old_decl (olddecl);
2220 error ("redeclaration of %q+D with no linkage", newdecl);
2221 locate_old_decl (olddecl);
2227 /* C++ does not permit a decl to appear multiple times at file
2230 && DECL_FILE_SCOPE_P (newdecl)
2231 && !DECL_EXTERNAL (newdecl)
2232 && !DECL_EXTERNAL (olddecl))
2233 warned |= warning_at (DECL_SOURCE_LOCATION (newdecl),
2235 ("duplicate declaration of %qD is "
2241 /* All decls must agree on a visibility. */
2242 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
2243 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
2244 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2246 warned |= warning (0, "redeclaration of %q+D with different visibility "
2247 "(old visibility preserved)", newdecl);
2250 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2252 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2253 if (DECL_DECLARED_INLINE_P (newdecl)
2254 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2255 warned |= warning (OPT_Wattributes,
2256 "inline declaration of %qD follows "
2257 "declaration with attribute noinline", newdecl);
2258 else if (DECL_DECLARED_INLINE_P (olddecl)
2259 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
2260 warned |= warning (OPT_Wattributes,
2261 "declaration of %q+D with attribute "
2262 "noinline follows inline declaration ", newdecl);
2263 else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl))
2264 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl)))
2265 warned |= warning (OPT_Wattributes,
2266 "declaration of %q+D with attribute "
2267 "%qs follows declaration with attribute %qs",
2268 newdecl, "noinline", "always_inline");
2269 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl))
2270 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2271 warned |= warning (OPT_Wattributes,
2272 "declaration of %q+D with attribute "
2273 "%qs follows declaration with attribute %qs",
2274 newdecl, "always_inline", "noinline");
2275 else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl))
2276 && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl)))
2277 warned |= warning (OPT_Wattributes,
2278 "declaration of %q+D with attribute %qs follows "
2279 "declaration with attribute %qs", newdecl, "cold",
2281 else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl))
2282 && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl)))
2283 warned |= warning (OPT_Wattributes,
2284 "declaration of %q+D with attribute %qs follows "
2285 "declaration with attribute %qs", newdecl, "hot",
2288 else /* PARM_DECL, VAR_DECL */
2290 /* Redeclaration of a parameter is a constraint violation (this is
2291 not explicitly stated, but follows from C99 6.7p3 [no more than
2292 one declaration of the same identifier with no linkage in the
2293 same scope, except type tags] and 6.2.2p6 [parameters have no
2294 linkage]). We must check for a forward parameter declaration,
2295 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2296 an extension, the mandatory diagnostic for which is handled by
2297 mark_forward_parm_decls. */
2299 if (TREE_CODE (newdecl) == PARM_DECL
2300 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
2302 error ("redefinition of parameter %q+D", newdecl);
2303 locate_old_decl (olddecl);
2308 /* Optional warning for completely redundant decls. */
2309 if (!warned && !pedwarned
2310 && warn_redundant_decls
2311 /* Don't warn about a function declaration followed by a
2313 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2314 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
2315 /* Don't warn about redundant redeclarations of builtins. */
2316 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2317 && !DECL_BUILT_IN (newdecl)
2318 && DECL_BUILT_IN (olddecl)
2319 && !C_DECL_DECLARED_BUILTIN (olddecl))
2320 /* Don't warn about an extern followed by a definition. */
2321 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
2322 /* Don't warn about forward parameter decls. */
2323 && !(TREE_CODE (newdecl) == PARM_DECL
2324 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2325 /* Don't warn about a variable definition following a declaration. */
2326 && !(TREE_CODE (newdecl) == VAR_DECL
2327 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
2329 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
2333 /* Report location of previous decl/defn. */
2334 if (warned || pedwarned)
2335 locate_old_decl (olddecl);
2337 #undef DECL_EXTERN_INLINE
2342 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2343 consistent with OLDDECL, but carries new information. Merge the
2344 new information into OLDDECL. This function issues no
2348 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
2350 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
2351 && DECL_INITIAL (newdecl) != 0);
2352 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
2353 && prototype_p (TREE_TYPE (newdecl)));
2354 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
2355 && prototype_p (TREE_TYPE (olddecl)));
2357 /* For real parm decl following a forward decl, rechain the old decl
2358 in its new location and clear TREE_ASM_WRITTEN (it's not a
2359 forward decl anymore). */
2360 if (TREE_CODE (newdecl) == PARM_DECL
2361 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2363 struct c_binding *b, **here;
2365 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
2366 if ((*here)->decl == olddecl)
2373 b->prev = current_scope->bindings;
2374 current_scope->bindings = b;
2376 TREE_ASM_WRITTEN (olddecl) = 0;
2379 DECL_ATTRIBUTES (newdecl)
2380 = targetm.merge_decl_attributes (olddecl, newdecl);
2382 /* Merge the data types specified in the two decls. */
2384 = TREE_TYPE (olddecl)
2385 = composite_type (newtype, oldtype);
2387 /* Lay the type out, unless already done. */
2388 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
2390 if (TREE_TYPE (newdecl) != error_mark_node)
2391 layout_type (TREE_TYPE (newdecl));
2392 if (TREE_CODE (newdecl) != FUNCTION_DECL
2393 && TREE_CODE (newdecl) != TYPE_DECL
2394 && TREE_CODE (newdecl) != CONST_DECL)
2395 layout_decl (newdecl, 0);
2399 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2400 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
2401 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
2402 DECL_MODE (newdecl) = DECL_MODE (olddecl);
2403 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2405 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2406 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2410 /* Keep the old rtl since we can safely use it. */
2411 if (HAS_RTL_P (olddecl))
2412 COPY_DECL_RTL (olddecl, newdecl);
2414 /* Merge the type qualifiers. */
2415 if (TREE_READONLY (newdecl))
2416 TREE_READONLY (olddecl) = 1;
2418 if (TREE_THIS_VOLATILE (newdecl))
2419 TREE_THIS_VOLATILE (olddecl) = 1;
2421 /* Merge deprecatedness. */
2422 if (TREE_DEPRECATED (newdecl))
2423 TREE_DEPRECATED (olddecl) = 1;
2425 /* If a decl is in a system header and the other isn't, keep the one on the
2426 system header. Otherwise, keep source location of definition rather than
2427 declaration and of prototype rather than non-prototype unless that
2428 prototype is built-in. */
2429 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2430 && DECL_IN_SYSTEM_HEADER (olddecl)
2431 && !DECL_IN_SYSTEM_HEADER (newdecl) )
2432 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2433 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2434 && DECL_IN_SYSTEM_HEADER (newdecl)
2435 && !DECL_IN_SYSTEM_HEADER (olddecl))
2436 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
2437 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
2438 || (old_is_prototype && !new_is_prototype
2439 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
2440 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2442 /* Merge the initialization information. */
2443 if (DECL_INITIAL (newdecl) == 0)
2444 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2446 /* Merge the threadprivate attribute. */
2447 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
2448 C_DECL_THREADPRIVATE_P (newdecl) = 1;
2450 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
2452 /* Copy the assembler name.
2453 Currently, it can only be defined in the prototype. */
2454 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2456 /* Use visibility of whichever declaration had it specified */
2457 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2459 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2460 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2463 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2465 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2466 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2467 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2468 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2469 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2470 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2471 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2472 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2473 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2474 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2475 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
2478 /* Merge the storage class information. */
2479 merge_weak (newdecl, olddecl);
2481 /* For functions, static overrides non-static. */
2482 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2484 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2485 /* This is since we don't automatically
2486 copy the attributes of NEWDECL into OLDDECL. */
2487 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2488 /* If this clears `static', clear it in the identifier too. */
2489 if (!TREE_PUBLIC (olddecl))
2490 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2494 /* In c99, 'extern' declaration before (or after) 'inline' means this
2495 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2497 if (TREE_CODE (newdecl) == FUNCTION_DECL
2498 && !flag_gnu89_inline
2499 && (DECL_DECLARED_INLINE_P (newdecl)
2500 || DECL_DECLARED_INLINE_P (olddecl))
2501 && (!DECL_DECLARED_INLINE_P (newdecl)
2502 || !DECL_DECLARED_INLINE_P (olddecl)
2503 || !DECL_EXTERNAL (olddecl))
2504 && DECL_EXTERNAL (newdecl)
2505 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
2506 && !current_function_decl)
2507 DECL_EXTERNAL (newdecl) = 0;
2509 /* An inline definition following a static declaration is not
2511 if (new_is_definition
2512 && (DECL_DECLARED_INLINE_P (newdecl)
2513 || DECL_DECLARED_INLINE_P (olddecl))
2514 && !TREE_PUBLIC (olddecl))
2515 DECL_EXTERNAL (newdecl) = 0;
2517 if (DECL_EXTERNAL (newdecl))
2519 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2520 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2522 /* An extern decl does not override previous storage class. */
2523 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2524 if (!DECL_EXTERNAL (newdecl))
2526 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2527 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2532 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2533 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2536 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2538 /* If we're redefining a function previously defined as extern
2539 inline, make sure we emit debug info for the inline before we
2540 throw it away, in case it was inlined into a function that
2541 hasn't been written out yet. */
2542 if (new_is_definition && DECL_INITIAL (olddecl))
2543 /* The new defn must not be inline. */
2544 DECL_UNINLINABLE (newdecl) = 1;
2547 /* If either decl says `inline', this fn is inline, unless
2548 its definition was passed already. */
2549 if (DECL_DECLARED_INLINE_P (newdecl)
2550 || DECL_DECLARED_INLINE_P (olddecl))
2551 DECL_DECLARED_INLINE_P (newdecl) = 1;
2553 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2554 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2556 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2557 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2558 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2559 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2562 if (DECL_BUILT_IN (olddecl))
2564 /* If redeclaring a builtin function, it stays built in.
2565 But it gets tagged as having been declared. */
2566 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2567 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2568 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
2569 if (new_is_prototype)
2571 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
2572 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2574 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2577 /* If a compatible prototype of these builtin functions
2578 is seen, assume the runtime implements it with the
2579 expected semantics. */
2580 case BUILT_IN_STPCPY:
2581 if (builtin_decl_explicit_p (fncode))
2582 set_builtin_decl_implicit_p (fncode, true);
2585 if (builtin_decl_explicit_p (fncode))
2586 set_builtin_decl_declared_p (fncode, true);
2592 C_DECL_BUILTIN_PROTOTYPE (newdecl)
2593 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
2596 /* Preserve function specific target and optimization options */
2597 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2598 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2599 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2600 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2602 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2603 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2604 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2605 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2607 /* Also preserve various other info from the definition. */
2608 if (!new_is_definition)
2611 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2612 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2613 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2614 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2615 DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl));
2616 for (t = DECL_ARGUMENTS (newdecl); t ; t = DECL_CHAIN (t))
2617 DECL_CONTEXT (t) = newdecl;
2619 /* See if we've got a function to instantiate from. */
2620 if (DECL_SAVED_TREE (olddecl))
2621 DECL_ABSTRACT_ORIGIN (newdecl)
2622 = DECL_ABSTRACT_ORIGIN (olddecl);
2626 /* Merge the USED information. */
2627 if (TREE_USED (olddecl))
2628 TREE_USED (newdecl) = 1;
2629 else if (TREE_USED (newdecl))
2630 TREE_USED (olddecl) = 1;
2631 if (TREE_CODE (olddecl) == VAR_DECL || TREE_CODE (olddecl) == PARM_DECL)
2632 DECL_READ_P (newdecl) |= DECL_READ_P (olddecl);
2633 if (DECL_PRESERVE_P (olddecl))
2634 DECL_PRESERVE_P (newdecl) = 1;
2635 else if (DECL_PRESERVE_P (newdecl))
2636 DECL_PRESERVE_P (olddecl) = 1;
2638 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2639 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2640 DECL_ARGUMENTS (if appropriate). */
2642 unsigned olddecl_uid = DECL_UID (olddecl);
2643 tree olddecl_context = DECL_CONTEXT (olddecl);
2644 tree olddecl_arguments = NULL;
2645 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2646 olddecl_arguments = DECL_ARGUMENTS (olddecl);
2648 memcpy ((char *) olddecl + sizeof (struct tree_common),
2649 (char *) newdecl + sizeof (struct tree_common),
2650 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2651 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2652 switch (TREE_CODE (olddecl))
2657 struct symtab_node *snode = olddecl->decl_with_vis.symtab_node;
2659 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2660 (char *) newdecl + sizeof (struct tree_decl_common),
2661 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2662 olddecl->decl_with_vis.symtab_node = snode;
2664 if ((DECL_EXTERNAL (olddecl)
2665 || TREE_PUBLIC (olddecl)
2666 || TREE_STATIC (olddecl))
2667 && DECL_SECTION_NAME (newdecl) != NULL)
2668 set_decl_section_name (olddecl, DECL_SECTION_NAME (newdecl));
2670 /* This isn't quite correct for something like
2671 int __thread x attribute ((tls_model ("local-exec")));
2672 extern int __thread x;
2673 as we'll lose the "local-exec" model. */
2674 if (TREE_CODE (olddecl) == VAR_DECL
2675 && DECL_THREAD_LOCAL_P (newdecl))
2676 set_decl_tls_model (olddecl, DECL_TLS_MODEL (newdecl));
2686 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2687 (char *) newdecl + sizeof (struct tree_decl_common),
2688 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2693 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2694 (char *) newdecl + sizeof (struct tree_decl_common),
2695 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
2697 DECL_UID (olddecl) = olddecl_uid;
2698 DECL_CONTEXT (olddecl) = olddecl_context;
2699 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2700 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
2703 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2704 so that encode_section_info has a chance to look at the new decl
2705 flags and attributes. */
2706 if (DECL_RTL_SET_P (olddecl)
2707 && (TREE_CODE (olddecl) == FUNCTION_DECL
2708 || (TREE_CODE (olddecl) == VAR_DECL
2709 && TREE_STATIC (olddecl))))
2710 make_decl_rtl (olddecl);
2713 /* Handle when a new declaration NEWDECL has the same name as an old
2714 one OLDDECL in the same binding contour. Prints an error message
2717 If safely possible, alter OLDDECL to look like NEWDECL, and return
2718 true. Otherwise, return false. */
2721 duplicate_decls (tree newdecl, tree olddecl)
2723 tree newtype = NULL, oldtype = NULL;
2725 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
2727 /* Avoid `unused variable' and other warnings for OLDDECL. */
2728 TREE_NO_WARNING (olddecl) = 1;
2732 merge_decls (newdecl, olddecl, newtype, oldtype);
2734 /* The NEWDECL will no longer be needed.
2736 Before releasing the node, be sure to remove function from symbol
2737 table that might have been inserted there to record comdat group.
2738 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2739 structure is shared in between NEWDECL and OLDECL. */
2740 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2741 DECL_STRUCT_FUNCTION (newdecl) = NULL;
2742 if (TREE_CODE (newdecl) == FUNCTION_DECL
2743 || TREE_CODE (newdecl) == VAR_DECL)
2745 struct symtab_node *snode = symtab_node::get (newdecl);
2754 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2756 warn_if_shadowing (tree new_decl)
2758 struct c_binding *b;
2760 /* Shadow warnings wanted? */
2762 /* No shadow warnings for internally generated vars. */
2763 || DECL_IS_BUILTIN (new_decl)
2764 /* No shadow warnings for vars made for inlining. */
2765 || DECL_FROM_INLINE (new_decl))
2768 /* Is anything being shadowed? Invisible decls do not count. */
2769 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
2770 if (b->decl && b->decl != new_decl && !b->invisible
2771 && (b->decl == error_mark_node
2772 || diagnostic_report_warnings_p (global_dc,
2773 DECL_SOURCE_LOCATION (b->decl))))
2775 tree old_decl = b->decl;
2776 bool warned = false;
2778 if (old_decl == error_mark_node)
2780 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
2781 "non-variable", new_decl);
2784 else if (TREE_CODE (old_decl) == PARM_DECL)
2785 warned = warning (OPT_Wshadow,
2786 "declaration of %q+D shadows a parameter",
2788 else if (DECL_FILE_SCOPE_P (old_decl))
2790 /* Do not warn if a variable shadows a function, unless
2791 the variable is a function or a pointer-to-function. */
2792 if (TREE_CODE (old_decl) == FUNCTION_DECL
2793 && TREE_CODE (new_decl) != FUNCTION_DECL
2794 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl)))
2797 warned = warning_at (DECL_SOURCE_LOCATION (new_decl), OPT_Wshadow,
2798 "declaration of %qD shadows a global "
2802 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2803 && DECL_BUILT_IN (old_decl))
2805 warning (OPT_Wshadow, "declaration of %q+D shadows "
2806 "a built-in function", new_decl);
2810 warned = warning (OPT_Wshadow, "declaration of %q+D shadows a "
2811 "previous local", new_decl);
2814 inform (DECL_SOURCE_LOCATION (old_decl),
2815 "shadowed declaration is here");
2821 /* Record a decl-node X as belonging to the current lexical scope.
2822 Check for errors (such as an incompatible declaration for the same
2823 name already seen in the same scope).
2825 Returns either X or an old decl for the same name.
2826 If an old decl is returned, it may have been smashed
2827 to agree with what X says. */
2832 tree name = DECL_NAME (x);
2833 struct c_scope *scope = current_scope;
2834 struct c_binding *b;
2835 bool nested = false;
2836 location_t locus = DECL_SOURCE_LOCATION (x);
2838 /* Must set DECL_CONTEXT for everything not at file scope or
2839 DECL_FILE_SCOPE_P won't work. Local externs don't count
2840 unless they have initializers (which generate code). */
2841 if (current_function_decl
2842 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2843 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2844 DECL_CONTEXT (x) = current_function_decl;
2846 /* Anonymous decls are just inserted in the scope. */
2849 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
2854 /* First, see if there is another declaration with the same name in
2855 the current scope. If there is, duplicate_decls may do all the
2856 work for us. If duplicate_decls returns false, that indicates
2857 two incompatible decls in the same scope; we are to silently
2858 replace the old one (duplicate_decls has issued all appropriate
2859 diagnostics). In particular, we should not consider possible
2860 duplicates in the external scope, or shadowing. */
2861 b = I_SYMBOL_BINDING (name);
2862 if (b && B_IN_SCOPE (b, scope))
2864 struct c_binding *b_ext, *b_use;
2865 tree type = TREE_TYPE (x);
2866 tree visdecl = b->decl;
2867 tree vistype = TREE_TYPE (visdecl);
2868 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2869 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2870 b->inner_comp = false;
2873 /* If this is an external linkage declaration, we should check
2874 for compatibility with the type in the external scope before
2875 setting the type at this scope based on the visible
2876 information only. */
2877 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2879 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2880 b_ext = b_ext->shadowed;
2885 TREE_TYPE (b_use->decl) = b_use->u.type;
2888 if (duplicate_decls (x, b_use->decl))
2892 /* Save the updated type in the external scope and
2893 restore the proper type for this scope. */
2895 if (comptypes (vistype, type))
2896 thistype = composite_type (vistype, type);
2898 thistype = TREE_TYPE (b_use->decl);
2899 b_use->u.type = TREE_TYPE (b_use->decl);
2900 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2901 && DECL_BUILT_IN (b_use->decl))
2903 = build_type_attribute_variant (thistype,
2906 TREE_TYPE (b_use->decl) = thistype;
2911 goto skip_external_and_shadow_checks;
2914 /* All declarations with external linkage, and all external
2915 references, go in the external scope, no matter what scope is
2916 current. However, the binding in that scope is ignored for
2917 purposes of normal name lookup. A separate binding structure is
2918 created in the requested scope; this governs the normal
2919 visibility of the symbol.
2921 The binding in the externals scope is used exclusively for
2922 detecting duplicate declarations of the same object, no matter
2923 what scope they are in; this is what we do here. (C99 6.2.7p2:
2924 All declarations that refer to the same object or function shall
2925 have compatible type; otherwise, the behavior is undefined.) */
2926 if (DECL_EXTERNAL (x) || scope == file_scope)
2928 tree type = TREE_TYPE (x);
2931 bool type_saved = false;
2932 if (b && !B_IN_EXTERNAL_SCOPE (b)
2933 && (TREE_CODE (b->decl) == FUNCTION_DECL
2934 || TREE_CODE (b->decl) == VAR_DECL)
2935 && DECL_FILE_SCOPE_P (b->decl))
2938 vistype = TREE_TYPE (visdecl);
2940 if (scope != file_scope
2941 && !DECL_IN_SYSTEM_HEADER (x))
2942 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2944 while (b && !B_IN_EXTERNAL_SCOPE (b))
2946 /* If this decl might be modified, save its type. This is
2947 done here rather than when the decl is first bound
2948 because the type may change after first binding, through
2949 being completed or through attributes being added. If we
2950 encounter multiple such decls, only the first should have
2951 its type saved; the others will already have had their
2952 proper types saved and the types will not have changed as
2953 their scopes will not have been re-entered. */
2954 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2956 b->u.type = TREE_TYPE (b->decl);
2959 if (B_IN_FILE_SCOPE (b)
2960 && TREE_CODE (b->decl) == VAR_DECL
2961 && TREE_STATIC (b->decl)
2962 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2963 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2964 && TREE_CODE (type) == ARRAY_TYPE
2965 && TYPE_DOMAIN (type)
2966 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2967 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2969 /* Array type completed in inner scope, which should be
2970 diagnosed if the completion does not have size 1 and
2971 it does not get completed in the file scope. */
2972 b->inner_comp = true;
2977 /* If a matching external declaration has been found, set its
2978 type to the composite of all the types of that declaration.
2979 After the consistency checks, it will be reset to the
2980 composite of the visible types only. */
2981 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2983 TREE_TYPE (b->decl) = b->u.type;
2985 /* The point of the same_translation_unit_p check here is,
2986 we want to detect a duplicate decl for a construct like
2987 foo() { extern bar(); } ... static bar(); but not if
2988 they are in different translation units. In any case,
2989 the static does not go in the externals scope. */
2991 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2992 && duplicate_decls (x, b->decl))
2997 if (comptypes (vistype, type))
2998 thistype = composite_type (vistype, type);
3000 thistype = TREE_TYPE (b->decl);
3004 b->u.type = TREE_TYPE (b->decl);
3005 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
3007 = build_type_attribute_variant (thistype,
3008 TYPE_ATTRIBUTES (b->u.type));
3009 TREE_TYPE (b->decl) = thistype;
3010 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
3014 else if (TREE_PUBLIC (x))
3016 if (visdecl && !b && duplicate_decls (x, visdecl))
3018 /* An external declaration at block scope referring to a
3019 visible entity with internal linkage. The composite
3020 type will already be correct for this scope, so we
3021 just need to fall through to make the declaration in
3028 bind (name, x, external_scope, /*invisible=*/true,
3029 /*nested=*/false, locus);
3035 if (TREE_CODE (x) != PARM_DECL)
3036 warn_if_shadowing (x);
3038 skip_external_and_shadow_checks:
3039 if (TREE_CODE (x) == TYPE_DECL)
3041 /* So this is a typedef, set its underlying type. */
3042 set_underlying_type (x);
3044 /* If X is a typedef defined in the current function, record it
3045 for the purpose of implementing the -Wunused-local-typedefs
3047 record_locally_defined_typedef (x);
3050 bind (name, x, scope, /*invisible=*/false, nested, locus);
3052 /* If x's type is incomplete because it's based on a
3053 structure or union which has not yet been fully declared,
3054 attach it to that structure or union type, so we can go
3055 back and complete the variable declaration later, if the
3056 structure or union gets fully declared.
3058 If the input is erroneous, we can have error_mark in the type
3059 slot (e.g. "f(void a, ...)") - that doesn't count as an
3061 if (TREE_TYPE (x) != error_mark_node
3062 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
3064 tree element = TREE_TYPE (x);
3066 while (TREE_CODE (element) == ARRAY_TYPE)
3067 element = TREE_TYPE (element);
3068 element = TYPE_MAIN_VARIANT (element);
3070 if ((TREE_CODE (element) == RECORD_TYPE
3071 || TREE_CODE (element) == UNION_TYPE)
3072 && (TREE_CODE (x) != TYPE_DECL
3073 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
3074 && !COMPLETE_TYPE_P (element))
3075 C_TYPE_INCOMPLETE_VARS (element)
3076 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
3081 /* Record X as belonging to file scope.
3082 This is used only internally by the Objective-C front end,
3083 and is limited to its needs. duplicate_decls is not called;
3084 if there is any preexisting decl for this identifier, it is an ICE. */
3087 pushdecl_top_level (tree x)
3090 bool nested = false;
3091 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
3093 name = DECL_NAME (x);
3095 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
3097 if (TREE_PUBLIC (x))
3099 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false,
3104 bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION);
3110 implicit_decl_warning (location_t loc, tree id, tree olddecl)
3112 if (warn_implicit_function_declaration)
3117 warned = pedwarn (loc, OPT_Wimplicit_function_declaration,
3118 "implicit declaration of function %qE", id);
3120 warned = warning_at (loc, OPT_Wimplicit_function_declaration,
3121 G_("implicit declaration of function %qE"), id);
3122 if (olddecl && warned)
3123 locate_old_decl (olddecl);
3127 /* This function represents mapping of a function code FCODE
3128 to its respective header. */
3131 header_for_builtin_fn (enum built_in_function fcode)
3135 CASE_FLT_FN (BUILT_IN_ACOS):
3136 CASE_FLT_FN (BUILT_IN_ACOSH):
3137 CASE_FLT_FN (BUILT_IN_ASIN):
3138 CASE_FLT_FN (BUILT_IN_ASINH):
3139 CASE_FLT_FN (BUILT_IN_ATAN):
3140 CASE_FLT_FN (BUILT_IN_ATANH):
3141 CASE_FLT_FN (BUILT_IN_ATAN2):
3142 CASE_FLT_FN (BUILT_IN_CBRT):
3143 CASE_FLT_FN (BUILT_IN_CEIL):
3144 CASE_FLT_FN (BUILT_IN_COPYSIGN):
3145 CASE_FLT_FN (BUILT_IN_COS):
3146 CASE_FLT_FN (BUILT_IN_COSH):
3147 CASE_FLT_FN (BUILT_IN_ERF):
3148 CASE_FLT_FN (BUILT_IN_ERFC):
3149 CASE_FLT_FN (BUILT_IN_EXP):
3150 CASE_FLT_FN (BUILT_IN_EXP2):
3151 CASE_FLT_FN (BUILT_IN_EXPM1):
3152 CASE_FLT_FN (BUILT_IN_FABS):
3153 CASE_FLT_FN (BUILT_IN_FDIM):
3154 CASE_FLT_FN (BUILT_IN_FLOOR):
3155 CASE_FLT_FN (BUILT_IN_FMA):
3156 CASE_FLT_FN (BUILT_IN_FMAX):
3157 CASE_FLT_FN (BUILT_IN_FMIN):
3158 CASE_FLT_FN (BUILT_IN_FMOD):
3159 CASE_FLT_FN (BUILT_IN_FREXP):
3160 CASE_FLT_FN (BUILT_IN_HYPOT):
3161 CASE_FLT_FN (BUILT_IN_ILOGB):
3162 CASE_FLT_FN (BUILT_IN_LDEXP):
3163 CASE_FLT_FN (BUILT_IN_LGAMMA):
3164 CASE_FLT_FN (BUILT_IN_LLRINT):
3165 CASE_FLT_FN (BUILT_IN_LLROUND):
3166 CASE_FLT_FN (BUILT_IN_LOG):
3167 CASE_FLT_FN (BUILT_IN_LOG10):
3168 CASE_FLT_FN (BUILT_IN_LOG1P):
3169 CASE_FLT_FN (BUILT_IN_LOG2):
3170 CASE_FLT_FN (BUILT_IN_LOGB):
3171 CASE_FLT_FN (BUILT_IN_LRINT):
3172 CASE_FLT_FN (BUILT_IN_LROUND):
3173 CASE_FLT_FN (BUILT_IN_MODF):
3174 CASE_FLT_FN (BUILT_IN_NAN):
3175 CASE_FLT_FN (BUILT_IN_NEARBYINT):
3176 CASE_FLT_FN (BUILT_IN_NEXTAFTER):
3177 CASE_FLT_FN (BUILT_IN_NEXTTOWARD):
3178 CASE_FLT_FN (BUILT_IN_POW):
3179 CASE_FLT_FN (BUILT_IN_REMAINDER):
3180 CASE_FLT_FN (BUILT_IN_REMQUO):
3181 CASE_FLT_FN (BUILT_IN_RINT):
3182 CASE_FLT_FN (BUILT_IN_ROUND):
3183 CASE_FLT_FN (BUILT_IN_SCALBLN):
3184 CASE_FLT_FN (BUILT_IN_SCALBN):
3185 CASE_FLT_FN (BUILT_IN_SIN):
3186 CASE_FLT_FN (BUILT_IN_SINH):
3187 CASE_FLT_FN (BUILT_IN_SINCOS):
3188 CASE_FLT_FN (BUILT_IN_SQRT):
3189 CASE_FLT_FN (BUILT_IN_TAN):
3190 CASE_FLT_FN (BUILT_IN_TANH):
3191 CASE_FLT_FN (BUILT_IN_TGAMMA):
3192 CASE_FLT_FN (BUILT_IN_TRUNC):
3193 case BUILT_IN_ISINF:
3194 case BUILT_IN_ISNAN:
3196 CASE_FLT_FN (BUILT_IN_CABS):
3197 CASE_FLT_FN (BUILT_IN_CACOS):
3198 CASE_FLT_FN (BUILT_IN_CACOSH):
3199 CASE_FLT_FN (BUILT_IN_CARG):
3200 CASE_FLT_FN (BUILT_IN_CASIN):
3201 CASE_FLT_FN (BUILT_IN_CASINH):
3202 CASE_FLT_FN (BUILT_IN_CATAN):
3203 CASE_FLT_FN (BUILT_IN_CATANH):
3204 CASE_FLT_FN (BUILT_IN_CCOS):
3205 CASE_FLT_FN (BUILT_IN_CCOSH):
3206 CASE_FLT_FN (BUILT_IN_CEXP):
3207 CASE_FLT_FN (BUILT_IN_CIMAG):
3208 CASE_FLT_FN (BUILT_IN_CLOG):
3209 CASE_FLT_FN (BUILT_IN_CONJ):
3210 CASE_FLT_FN (BUILT_IN_CPOW):
3211 CASE_FLT_FN (BUILT_IN_CPROJ):
3212 CASE_FLT_FN (BUILT_IN_CREAL):
3213 CASE_FLT_FN (BUILT_IN_CSIN):
3214 CASE_FLT_FN (BUILT_IN_CSINH):
3215 CASE_FLT_FN (BUILT_IN_CSQRT):
3216 CASE_FLT_FN (BUILT_IN_CTAN):
3217 CASE_FLT_FN (BUILT_IN_CTANH):
3218 return "<complex.h>";
3219 case BUILT_IN_MEMCHR:
3220 case BUILT_IN_MEMCMP:
3221 case BUILT_IN_MEMCPY:
3222 case BUILT_IN_MEMMOVE:
3223 case BUILT_IN_MEMSET:
3224 case BUILT_IN_STRCAT:
3225 case BUILT_IN_STRCHR:
3226 case BUILT_IN_STRCMP:
3227 case BUILT_IN_STRCPY:
3228 case BUILT_IN_STRCSPN:
3229 case BUILT_IN_STRLEN:
3230 case BUILT_IN_STRNCAT:
3231 case BUILT_IN_STRNCMP:
3232 case BUILT_IN_STRNCPY:
3233 case BUILT_IN_STRPBRK:
3234 case BUILT_IN_STRRCHR:
3235 case BUILT_IN_STRSPN:
3236 case BUILT_IN_STRSTR:
3237 return "<string.h>";
3238 case BUILT_IN_FPRINTF:
3240 case BUILT_IN_FPUTC:
3241 case BUILT_IN_FPUTS:
3242 case BUILT_IN_FSCANF:
3243 case BUILT_IN_FWRITE:
3244 case BUILT_IN_PRINTF:
3245 case BUILT_IN_PUTCHAR:
3247 case BUILT_IN_SCANF:
3248 case BUILT_IN_SNPRINTF:
3249 case BUILT_IN_SPRINTF:
3250 case BUILT_IN_SSCANF:
3251 case BUILT_IN_VFPRINTF:
3252 case BUILT_IN_VFSCANF:
3253 case BUILT_IN_VPRINTF:
3254 case BUILT_IN_VSCANF:
3255 case BUILT_IN_VSNPRINTF:
3256 case BUILT_IN_VSPRINTF:
3257 case BUILT_IN_VSSCANF:
3259 case BUILT_IN_ISALNUM:
3260 case BUILT_IN_ISALPHA:
3261 case BUILT_IN_ISBLANK:
3262 case BUILT_IN_ISCNTRL:
3263 case BUILT_IN_ISDIGIT:
3264 case BUILT_IN_ISGRAPH:
3265 case BUILT_IN_ISLOWER:
3266 case BUILT_IN_ISPRINT:
3267 case BUILT_IN_ISPUNCT:
3268 case BUILT_IN_ISSPACE:
3269 case BUILT_IN_ISUPPER:
3270 case BUILT_IN_ISXDIGIT:
3271 case BUILT_IN_TOLOWER:
3272 case BUILT_IN_TOUPPER:
3274 case BUILT_IN_ISWALNUM:
3275 case BUILT_IN_ISWALPHA:
3276 case BUILT_IN_ISWBLANK:
3277 case BUILT_IN_ISWCNTRL:
3278 case BUILT_IN_ISWDIGIT:
3279 case BUILT_IN_ISWGRAPH:
3280 case BUILT_IN_ISWLOWER:
3281 case BUILT_IN_ISWPRINT:
3282 case BUILT_IN_ISWPUNCT:
3283 case BUILT_IN_ISWSPACE:
3284 case BUILT_IN_ISWUPPER:
3285 case BUILT_IN_ISWXDIGIT:
3286 case BUILT_IN_TOWLOWER:
3287 case BUILT_IN_TOWUPPER:
3288 return "<wctype.h>";
3289 case BUILT_IN_ABORT:
3291 case BUILT_IN_CALLOC:
3295 case BUILT_IN_LLABS:
3296 case BUILT_IN_MALLOC:
3297 case BUILT_IN_REALLOC:
3298 case BUILT_IN__EXIT2:
3299 case BUILT_IN_ALIGNED_ALLOC:
3300 return "<stdlib.h>";
3301 case BUILT_IN_IMAXABS:
3302 return "<inttypes.h>";
3303 case BUILT_IN_STRFTIME:
3310 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
3311 function of type int (). */
3314 implicitly_declare (location_t loc, tree functionid)
3316 struct c_binding *b;
3320 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
3322 if (B_IN_SCOPE (b, external_scope))
3331 if (decl == error_mark_node)
3334 /* FIXME: Objective-C has weird not-really-builtin functions
3335 which are supposed to be visible automatically. They wind up
3336 in the external scope because they're pushed before the file
3337 scope gets created. Catch this here and rebind them into the
3339 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
3341 bind (functionid, decl, file_scope,
3342 /*invisible=*/false, /*nested=*/true,
3343 DECL_SOURCE_LOCATION (decl));
3348 tree newtype = default_function_type;
3350 TREE_TYPE (decl) = b->u.type;
3351 /* Implicit declaration of a function already declared
3352 (somehow) in a different scope, or as a built-in.
3353 If this is the first time this has happened, warn;
3354 then recycle the old declaration but with the new type. */
3355 if (!C_DECL_IMPLICIT (decl))
3357 implicit_decl_warning (loc, functionid, decl);
3358 C_DECL_IMPLICIT (decl) = 1;
3360 if (DECL_BUILT_IN (decl))
3362 newtype = build_type_attribute_variant (newtype,
3364 (TREE_TYPE (decl)));
3365 if (!comptypes (newtype, TREE_TYPE (decl)))
3367 bool warned = warning_at (loc, 0, "incompatible implicit "
3368 "declaration of built-in "
3369 "function %qD", decl);
3370 /* See if we can hint which header to include. */
3372 = header_for_builtin_fn (DECL_FUNCTION_CODE (decl));
3373 if (header != NULL && warned)
3374 inform (loc, "include %qs or provide a declaration of %qD",
3376 newtype = TREE_TYPE (decl);
3381 if (!comptypes (newtype, TREE_TYPE (decl)))
3383 error_at (loc, "incompatible implicit declaration of "
3384 "function %qD", decl);
3385 locate_old_decl (decl);
3388 b->u.type = TREE_TYPE (decl);
3389 TREE_TYPE (decl) = newtype;
3390 bind (functionid, decl, current_scope,
3391 /*invisible=*/false, /*nested=*/true,
3392 DECL_SOURCE_LOCATION (decl));
3397 /* Not seen before. */
3398 decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type);
3399 DECL_EXTERNAL (decl) = 1;
3400 TREE_PUBLIC (decl) = 1;
3401 C_DECL_IMPLICIT (decl) = 1;
3402 implicit_decl_warning (loc, functionid, 0);
3403 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
3405 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
3407 /* C89 says implicit declarations are in the innermost block.
3408 So we record the decl in the standard fashion. */
3409 decl = pushdecl (decl);
3411 /* No need to call objc_check_decl here - it's a function type. */
3412 rest_of_decl_compilation (decl, 0, 0);
3414 /* Write a record describing this implicit function declaration
3415 to the prototypes file (if requested). */
3416 gen_aux_info_record (decl, 0, 1, 0);
3418 /* Possibly apply some default attributes to this implicit declaration. */
3419 decl_attributes (&decl, NULL_TREE, 0);
3424 /* Issue an error message for a reference to an undeclared variable
3425 ID, including a reference to a builtin outside of function-call
3426 context. Establish a binding of the identifier to error_mark_node
3427 in an appropriate scope, which will suppress further errors for the
3428 same identifier. The error message should be given location LOC. */
3430 undeclared_variable (location_t loc, tree id)
3432 static bool already = false;
3433 struct c_scope *scope;
3435 if (current_function_decl == 0)
3437 error_at (loc, "%qE undeclared here (not in a function)", id);
3438 scope = current_scope;
3442 if (!objc_diagnose_private_ivar (id))
3443 error_at (loc, "%qE undeclared (first use in this function)", id);
3446 inform (loc, "each undeclared identifier is reported only"
3447 " once for each function it appears in");
3451 /* If we are parsing old-style parameter decls, current_function_decl
3452 will be nonnull but current_function_scope will be null. */
3453 scope = current_function_scope ? current_function_scope : current_scope;
3455 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
3459 /* Subroutine of lookup_label, declare_label, define_label: construct a
3460 LABEL_DECL with all the proper frills. Also create a struct
3461 c_label_vars initialized for the current scope. */
3464 make_label (location_t location, tree name, bool defining,
3465 struct c_label_vars **p_label_vars)
3467 tree label = build_decl (location, LABEL_DECL, name, void_type_node);
3468 DECL_CONTEXT (label) = current_function_decl;
3469 DECL_MODE (label) = VOIDmode;
3471 c_label_vars *label_vars = ggc_alloc<c_label_vars> ();
3472 label_vars->shadowed = NULL;
3473 set_spot_bindings (&label_vars->label_bindings, defining);
3474 label_vars->decls_in_scope = make_tree_vector ();
3475 label_vars->gotos = NULL;
3476 *p_label_vars = label_vars;
3481 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3482 Create one if none exists so far for the current function.
3483 This is called when a label is used in a goto expression or
3484 has its address taken. */
3487 lookup_label (tree name)
3490 struct c_label_vars *label_vars;
3492 if (current_function_scope == 0)
3494 error ("label %qE referenced outside of any function", name);
3498 /* Use a label already defined or ref'd with this name, but not if
3499 it is inherited from a containing function and wasn't declared
3501 label = I_LABEL_DECL (name);
3502 if (label && (DECL_CONTEXT (label) == current_function_decl
3503 || C_DECLARED_LABEL_FLAG (label)))
3505 /* If the label has only been declared, update its apparent
3506 location to point here, for better diagnostics if it
3507 turns out not to have been defined. */
3508 if (DECL_INITIAL (label) == NULL_TREE)
3509 DECL_SOURCE_LOCATION (label) = input_location;
3513 /* No label binding for that identifier; make one. */
3514 label = make_label (input_location, name, false, &label_vars);
3516 /* Ordinary labels go in the current function scope. */
3517 bind_label (name, label, current_function_scope, label_vars);
3522 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3526 warn_about_goto (location_t goto_loc, tree label, tree decl)
3528 if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3530 "jump into scope of identifier with variably modified type");
3532 warning_at (goto_loc, OPT_Wjump_misses_init,
3533 "jump skips variable initialization");
3534 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3535 inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl);
3538 /* Look up a label because of a goto statement. This is like
3539 lookup_label, but also issues any appropriate warnings. */
3542 lookup_label_for_goto (location_t loc, tree name)
3545 struct c_label_vars *label_vars;
3549 label = lookup_label (name);
3550 if (label == NULL_TREE)
3553 /* If we are jumping to a different function, we can't issue any
3555 if (DECL_CONTEXT (label) != current_function_decl)
3557 gcc_assert (C_DECLARED_LABEL_FLAG (label));
3561 label_vars = I_LABEL_BINDING (name)->u.label;
3563 /* If the label has not yet been defined, then push this goto on a
3564 list for possible later warnings. */
3565 if (label_vars->label_bindings.scope == NULL)
3567 c_goto_bindings *g = ggc_alloc<c_goto_bindings> ();
3570 set_spot_bindings (&g->goto_bindings, true);
3571 vec_safe_push (label_vars->gotos, g);
3575 /* If there are any decls in label_vars->decls_in_scope, then this
3576 goto has missed the declaration of the decl. This happens for a
3582 Issue a warning or error. */
3583 FOR_EACH_VEC_SAFE_ELT (label_vars->decls_in_scope, ix, decl)
3584 warn_about_goto (loc, label, decl);
3586 if (label_vars->label_bindings.left_stmt_expr)
3588 error_at (loc, "jump into statement expression");
3589 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3595 /* Make a label named NAME in the current function, shadowing silently
3596 any that may be inherited from containing functions or containing
3597 scopes. This is called for __label__ declarations. */
3600 declare_label (tree name)
3602 struct c_binding *b = I_LABEL_BINDING (name);
3604 struct c_label_vars *label_vars;
3606 /* Check to make sure that the label hasn't already been declared
3608 if (b && B_IN_CURRENT_SCOPE (b))
3610 error ("duplicate label declaration %qE", name);
3611 locate_old_decl (b->decl);
3613 /* Just use the previous declaration. */
3617 label = make_label (input_location, name, false, &label_vars);
3618 C_DECLARED_LABEL_FLAG (label) = 1;
3620 /* Declared labels go in the current scope. */
3621 bind_label (name, label, current_scope, label_vars);
3626 /* When we define a label, issue any appropriate warnings if there are
3627 any gotos earlier in the function which jump to this label. */
3630 check_earlier_gotos (tree label, struct c_label_vars* label_vars)
3633 struct c_goto_bindings *g;
3635 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
3637 struct c_binding *b;
3638 struct c_scope *scope;
3640 /* We have a goto to this label. The goto is going forward. In
3641 g->scope, the goto is going to skip any binding which was
3642 defined after g->bindings_in_scope. */
3643 if (g->goto_bindings.scope->has_jump_unsafe_decl)
3645 for (b = g->goto_bindings.scope->bindings;
3646 b != g->goto_bindings.bindings_in_scope;
3649 if (decl_jump_unsafe (b->decl))
3650 warn_about_goto (g->loc, label, b->decl);
3654 /* We also need to warn about decls defined in any scopes
3655 between the scope of the label and the scope of the goto. */
3656 for (scope = label_vars->label_bindings.scope;
3657 scope != g->goto_bindings.scope;
3658 scope = scope->outer)
3660 gcc_assert (scope != NULL);
3661 if (scope->has_jump_unsafe_decl)
3663 if (scope == label_vars->label_bindings.scope)
3664 b = label_vars->label_bindings.bindings_in_scope;
3666 b = scope->bindings;
3667 for (; b != NULL; b = b->prev)
3669 if (decl_jump_unsafe (b->decl))
3670 warn_about_goto (g->loc, label, b->decl);
3675 if (g->goto_bindings.stmt_exprs > 0)
3677 error_at (g->loc, "jump into statement expression");
3678 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here",
3683 /* Now that the label is defined, we will issue warnings about
3684 subsequent gotos to this label when we see them. */
3685 vec_safe_truncate (label_vars->gotos, 0);
3686 label_vars->gotos = NULL;
3689 /* Define a label, specifying the location in the source file.
3690 Return the LABEL_DECL node for the label, if the definition is valid.
3691 Otherwise return 0. */
3694 define_label (location_t location, tree name)
3696 /* Find any preexisting label with this name. It is an error
3697 if that label has already been defined in this function, or
3698 if there is a containing function with a declared label with
3700 tree label = I_LABEL_DECL (name);
3703 && ((DECL_CONTEXT (label) == current_function_decl
3704 && DECL_INITIAL (label) != 0)
3705 || (DECL_CONTEXT (label) != current_function_decl
3706 && C_DECLARED_LABEL_FLAG (label))))
3708 error_at (location, "duplicate label %qD", label);
3709 locate_old_decl (label);
3712 else if (label && DECL_CONTEXT (label) == current_function_decl)
3714 struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label;
3716 /* The label has been used or declared already in this function,
3717 but not defined. Update its location to point to this
3719 DECL_SOURCE_LOCATION (label) = location;
3720 set_spot_bindings (&label_vars->label_bindings, true);
3722 /* Issue warnings as required about any goto statements from
3723 earlier in the function. */
3724 check_earlier_gotos (label, label_vars);
3728 struct c_label_vars *label_vars;
3730 /* No label binding for that identifier; make one. */
3731 label = make_label (location, name, true, &label_vars);
3733 /* Ordinary labels go in the current function scope. */
3734 bind_label (name, label, current_function_scope, label_vars);
3737 if (!in_system_header_at (input_location) && lookup_name (name))
3738 warning_at (location, OPT_Wtraditional,
3739 "traditional C lacks a separate namespace "
3740 "for labels, identifier %qE conflicts", name);
3742 /* Mark label as having been defined. */
3743 DECL_INITIAL (label) = error_mark_node;
3747 /* Get the bindings for a new switch statement. This is used to issue
3748 warnings as appropriate for jumps from the switch to case or
3751 struct c_spot_bindings *
3752 c_get_switch_bindings (void)
3754 struct c_spot_bindings *switch_bindings;
3756 switch_bindings = XNEW (struct c_spot_bindings);
3757 set_spot_bindings (switch_bindings, true);
3758 return switch_bindings;
3762 c_release_switch_bindings (struct c_spot_bindings *bindings)
3764 gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr);
3768 /* This is called at the point of a case or default label to issue
3769 warnings about decls as needed. It returns true if it found an
3770 error, not just a warning. */
3773 c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings,
3774 location_t switch_loc, location_t case_loc)
3777 struct c_scope *scope;
3780 for (scope = current_scope;
3781 scope != switch_bindings->scope;
3782 scope = scope->outer)
3784 struct c_binding *b;
3786 gcc_assert (scope != NULL);
3788 if (!scope->has_jump_unsafe_decl)
3791 for (b = scope->bindings; b != NULL; b = b->prev)
3793 if (decl_jump_unsafe (b->decl))
3795 if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE))
3799 ("switch jumps into scope of identifier with "
3800 "variably modified type"));
3803 warning_at (case_loc, OPT_Wjump_misses_init,
3804 "switch jumps over variable initialization");
3805 inform (switch_loc, "switch starts here");
3806 inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here",
3812 if (switch_bindings->stmt_exprs > 0)
3815 error_at (case_loc, "switch jumps into statement expression");
3816 inform (switch_loc, "switch starts here");
3822 /* Given NAME, an IDENTIFIER_NODE,
3823 return the structure (or union or enum) definition for that name.
3824 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3825 CODE says which kind of type the caller wants;
3826 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3827 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3828 location where the tag was defined.
3829 If the wrong kind of type is found, an error is reported. */
3832 lookup_tag (enum tree_code code, tree name, int thislevel_only,
3835 struct c_binding *b = I_TAG_BINDING (name);
3841 /* We only care about whether it's in this level if
3842 thislevel_only was set or it might be a type clash. */
3843 if (thislevel_only || TREE_CODE (b->decl) != code)
3845 /* For our purposes, a tag in the external scope is the same as
3846 a tag in the file scope. (Primarily relevant to Objective-C
3847 and its builtin structure tags, which get pushed before the
3848 file scope is created.) */
3849 if (B_IN_CURRENT_SCOPE (b)
3850 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
3854 if (thislevel_only && !thislevel)
3857 if (TREE_CODE (b->decl) != code)
3859 /* Definition isn't the kind we were looking for. */
3860 pending_invalid_xref = name;
3861 pending_invalid_xref_location = input_location;
3863 /* If in the same binding level as a declaration as a tag
3864 of a different type, this must not be allowed to
3865 shadow that tag, so give the error immediately.
3866 (For example, "struct foo; union foo;" is invalid.) */
3868 pending_xref_error ();
3877 /* Print an error message now
3878 for a recent invalid struct, union or enum cross reference.
3879 We don't print them immediately because they are not invalid
3880 when used in the `struct foo;' construct for shadowing. */
3883 pending_xref_error (void)
3885 if (pending_invalid_xref != 0)
3886 error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag",
3887 pending_invalid_xref);
3888 pending_invalid_xref = 0;
3892 /* Look up NAME in the current scope and its superiors
3893 in the namespace of variables, functions and typedefs.
3894 Return a ..._DECL node of some kind representing its definition,
3895 or return 0 if it is undefined. */
3898 lookup_name (tree name)
3900 struct c_binding *b = I_SYMBOL_BINDING (name);
3901 if (b && !b->invisible)
3903 maybe_record_typedef_use (b->decl);
3909 /* Similar to `lookup_name' but look only at the indicated scope. */
3912 lookup_name_in_scope (tree name, struct c_scope *scope)
3914 struct c_binding *b;
3916 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
3917 if (B_IN_SCOPE (b, scope))
3922 /* Create the predefined scalar types of C,
3923 and some nodes representing standard constants (0, 1, (void *) 0).
3924 Initialize the global scope.
3925 Make definitions for built-in primitive functions. */
3928 c_init_decl_processing (void)
3930 location_t save_loc = input_location;
3932 /* Initialize reserved words for parser. */
3935 current_function_decl = 0;
3937 gcc_obstack_init (&parser_obstack);
3939 /* Make the externals scope. */
3941 external_scope = current_scope;
3943 /* Declarations from c_common_nodes_and_builtins must not be associated
3944 with this input file, lest we get differences between using and not
3945 using preprocessed headers. */
3946 input_location = BUILTINS_LOCATION;
3948 c_common_nodes_and_builtins ();
3950 /* In C, comparisons and TRUTH_* expressions have type int. */
3951 truthvalue_type_node = integer_type_node;
3952 truthvalue_true_node = integer_one_node;
3953 truthvalue_false_node = integer_zero_node;
3955 /* Even in C99, which has a real boolean type. */
3956 pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"),
3957 boolean_type_node));
3959 input_location = save_loc;
3961 make_fname_decl = c_make_fname_decl;
3962 start_fname_decls ();
3965 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3966 give the decl, NAME is the initialization string and TYPE_DEP
3967 indicates whether NAME depended on the type of the function. As we
3968 don't yet implement delayed emission of static data, we mark the
3969 decl as emitted so it is not placed in the output. Anything using
3970 it must therefore pull out the STRING_CST initializer directly.
3974 c_make_fname_decl (location_t loc, tree id, int type_dep)
3976 const char *name = fname_as_string (type_dep);
3977 tree decl, type, init;
3978 size_t length = strlen (name);
3980 type = build_array_type (char_type_node,
3981 build_index_type (size_int (length)));
3982 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
3984 decl = build_decl (loc, VAR_DECL, id, type);
3986 TREE_STATIC (decl) = 1;
3987 TREE_READONLY (decl) = 1;
3988 DECL_ARTIFICIAL (decl) = 1;
3990 init = build_string (length + 1, name);
3991 free (CONST_CAST (char *, name));
3992 TREE_TYPE (init) = type;
3993 DECL_INITIAL (decl) = init;
3995 TREE_USED (decl) = 1;
3997 if (current_function_decl
3998 /* For invalid programs like this:
4001 const char* p = __FUNCTION__;
4003 the __FUNCTION__ is believed to appear in K&R style function
4004 parameter declarator. In that case we still don't have
4006 && (!seen_error () || current_function_scope))
4008 DECL_CONTEXT (decl) = current_function_decl;
4009 bind (id, decl, current_function_scope,
4010 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
4013 finish_decl (decl, loc, init, NULL_TREE, NULL_TREE);
4019 c_builtin_function (tree decl)
4021 tree type = TREE_TYPE (decl);
4022 tree id = DECL_NAME (decl);
4024 const char *name = IDENTIFIER_POINTER (id);
4025 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
4027 /* Should never be called on a symbol with a preexisting meaning. */
4028 gcc_assert (!I_SYMBOL_BINDING (id));
4030 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false,
4033 /* Builtins in the implementation namespace are made visible without
4034 needing to be explicitly declared. See push_file_scope. */
4035 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
4037 DECL_CHAIN (decl) = visible_builtins;
4038 visible_builtins = decl;
4045 c_builtin_function_ext_scope (tree decl)
4047 tree type = TREE_TYPE (decl);
4048 tree id = DECL_NAME (decl);
4050 const char *name = IDENTIFIER_POINTER (id);
4051 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
4054 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false,
4057 /* Builtins in the implementation namespace are made visible without
4058 needing to be explicitly declared. See push_file_scope. */
4059 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
4061 DECL_CHAIN (decl) = visible_builtins;
4062 visible_builtins = decl;
4068 /* Called when a declaration is seen that contains no names to declare.
4069 If its type is a reference to a structure, union or enum inherited
4070 from a containing scope, shadow that tag name for the current scope
4071 with a forward reference.
4072 If its type defines a new named structure or union
4073 or defines an enum, it is valid but we need not do anything here.
4074 Otherwise, it is an error. */
4077 shadow_tag (const struct c_declspecs *declspecs)
4079 shadow_tag_warned (declspecs, 0);
4082 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
4085 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
4087 bool found_tag = false;
4089 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
4091 tree value = declspecs->type;
4092 enum tree_code code = TREE_CODE (value);
4094 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
4095 /* Used to test also that TYPE_SIZE (value) != 0.
4096 That caused warning for `struct foo;' at top level in the file. */
4098 tree name = TYPE_NAME (value);
4103 if (declspecs->restrict_p)
4105 error ("invalid use of %<restrict%>");
4111 if (warned != 1 && code != ENUMERAL_TYPE)
4112 /* Empty unnamed enum OK */
4114 pedwarn (input_location, 0,
4115 "unnamed struct/union that defines no instances");
4119 else if (declspecs->typespec_kind != ctsk_tagdef
4120 && declspecs->typespec_kind != ctsk_tagfirstref
4121 && declspecs->storage_class != csc_none)
4124 pedwarn (input_location, 0,
4125 "empty declaration with storage class specifier "
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->const_p
4133 || declspecs->volatile_p
4134 || declspecs->atomic_p
4135 || declspecs->restrict_p
4136 || declspecs->address_space))
4139 pedwarn (input_location, 0,
4140 "empty declaration with type qualifier "
4141 "does not redeclare tag");
4143 pending_xref_error ();
4145 else if (declspecs->typespec_kind != ctsk_tagdef
4146 && declspecs->typespec_kind != ctsk_tagfirstref
4147 && declspecs->alignas_p)
4150 pedwarn (input_location, 0,
4151 "empty declaration with %<_Alignas%> "
4152 "does not redeclare tag");
4154 pending_xref_error ();
4158 pending_invalid_xref = 0;
4159 t = lookup_tag (code, name, 1, NULL);
4163 t = make_node (code);
4164 pushtag (input_location, name, t);
4170 if (warned != 1 && !in_system_header_at (input_location))
4172 pedwarn (input_location, 0,
4173 "useless type name in empty declaration");
4178 else if (warned != 1 && !in_system_header_at (input_location)
4179 && declspecs->typedef_p)
4181 pedwarn (input_location, 0, "useless type name in empty declaration");
4185 pending_invalid_xref = 0;
4187 if (declspecs->inline_p)
4189 error ("%<inline%> in empty declaration");
4193 if (declspecs->noreturn_p)
4195 error ("%<_Noreturn%> in empty declaration");
4199 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
4201 error ("%<auto%> in file-scope empty declaration");
4205 if (current_scope == file_scope && declspecs->storage_class == csc_register)
4207 error ("%<register%> in file-scope empty declaration");
4211 if (!warned && !in_system_header_at (input_location)
4212 && declspecs->storage_class != csc_none)
4214 warning (0, "useless storage class specifier in empty declaration");
4218 if (!warned && !in_system_header_at (input_location) && declspecs->thread_p)
4220 warning (0, "useless %qs in empty declaration",
4221 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
4226 && !in_system_header_at (input_location)
4227 && (declspecs->const_p
4228 || declspecs->volatile_p
4229 || declspecs->atomic_p
4230 || declspecs->restrict_p
4231 || declspecs->address_space))
4233 warning (0, "useless type qualifier in empty declaration");
4237 if (!warned && !in_system_header_at (input_location)
4238 && declspecs->alignas_p)
4240 warning (0, "useless %<_Alignas%> in empty declaration");
4247 pedwarn (input_location, 0, "empty declaration");
4252 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
4253 bits. SPECS represents declaration specifiers that the grammar
4254 only permits to contain type qualifiers and attributes. */
4257 quals_from_declspecs (const struct c_declspecs *specs)
4259 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
4260 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
4261 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0)
4262 | (specs->atomic_p ? TYPE_QUAL_ATOMIC : 0)
4263 | (ENCODE_QUAL_ADDR_SPACE (specs->address_space)));
4264 gcc_assert (!specs->type
4265 && !specs->decl_attr
4266 && specs->typespec_word == cts_none
4267 && specs->storage_class == csc_none
4268 && !specs->typedef_p
4269 && !specs->explicit_signed_p
4270 && !specs->deprecated_p
4272 && !specs->long_long_p
4275 && !specs->unsigned_p
4276 && !specs->complex_p
4278 && !specs->noreturn_p
4279 && !specs->thread_p);
4283 /* Construct an array declarator. LOC is the location of the
4284 beginning of the array (usually the opening brace). EXPR is the
4285 expression inside [], or NULL_TREE. QUALS are the type qualifiers
4286 inside the [] (to be applied to the pointer to which a parameter
4287 array is converted). STATIC_P is true if "static" is inside the
4288 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
4289 VLA of unspecified length which is nevertheless a complete type,
4290 false otherwise. The field for the contained declarator is left to
4291 be filled in by set_array_declarator_inner. */
4293 struct c_declarator *
4294 build_array_declarator (location_t loc,
4295 tree expr, struct c_declspecs *quals, bool static_p,
4298 struct c_declarator *declarator = XOBNEW (&parser_obstack,
4299 struct c_declarator);
4300 declarator->id_loc = loc;
4301 declarator->kind = cdk_array;
4302 declarator->declarator = 0;
4303 declarator->u.array.dimen = expr;
4306 declarator->u.array.attrs = quals->attrs;
4307 declarator->u.array.quals = quals_from_declspecs (quals);
4311 declarator->u.array.attrs = NULL_TREE;
4312 declarator->u.array.quals = 0;
4314 declarator->u.array.static_p = static_p;
4315 declarator->u.array.vla_unspec_p = vla_unspec_p;
4316 if (static_p || quals != NULL)
4317 pedwarn_c90 (loc, OPT_Wpedantic,
4318 "ISO C90 does not support %<static%> or type "
4319 "qualifiers in parameter array declarators");
4321 pedwarn_c90 (loc, OPT_Wpedantic,
4322 "ISO C90 does not support %<[*]%> array declarators");
4325 if (!current_scope->parm_flag)
4328 error_at (loc, "%<[*]%> not allowed in other than "
4329 "function prototype scope");
4330 declarator->u.array.vla_unspec_p = false;
4333 current_scope->had_vla_unspec = true;
4338 /* Set the contained declarator of an array declarator. DECL is the
4339 declarator, as constructed by build_array_declarator; INNER is what
4340 appears on the left of the []. */
4342 struct c_declarator *
4343 set_array_declarator_inner (struct c_declarator *decl,
4344 struct c_declarator *inner)
4346 decl->declarator = inner;
4350 /* INIT is a constructor that forms DECL's initializer. If the final
4351 element initializes a flexible array field, add the size of that
4352 initializer to DECL's size. */
4355 add_flexible_array_elts_to_size (tree decl, tree init)
4359 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init)))
4362 elt = CONSTRUCTOR_ELTS (init)->last ().value;
4363 type = TREE_TYPE (elt);
4364 if (TREE_CODE (type) == ARRAY_TYPE
4365 && TYPE_SIZE (type) == NULL_TREE
4366 && TYPE_DOMAIN (type) != NULL_TREE
4367 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
4369 complete_array_type (&type, elt, false);
4371 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
4372 DECL_SIZE_UNIT (decl)
4373 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
4377 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4378 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4379 before the type name, and set *EXPR_CONST_OPERANDS, if
4380 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4381 appear in a constant expression. */
4384 groktypename (struct c_type_name *type_name, tree *expr,
4385 bool *expr_const_operands)
4388 tree attrs = type_name->specs->attrs;
4390 type_name->specs->attrs = NULL_TREE;
4392 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
4393 false, NULL, &attrs, expr, expr_const_operands,
4396 /* Apply attributes. */
4397 decl_attributes (&type, attrs, 0);
4402 /* Wrapper for decl_attributes that adds some implicit attributes
4403 to VAR_DECLs or FUNCTION_DECLs. */
4406 c_decl_attributes (tree *node, tree attributes, int flags)
4408 /* Add implicit "omp declare target" attribute if requested. */
4409 if (current_omp_declare_target_attribute
4410 && ((TREE_CODE (*node) == VAR_DECL && TREE_STATIC (*node))
4411 || TREE_CODE (*node) == FUNCTION_DECL))
4413 if (TREE_CODE (*node) == VAR_DECL
4414 && ((DECL_CONTEXT (*node)
4415 && TREE_CODE (DECL_CONTEXT (*node)) == FUNCTION_DECL)
4416 || (current_function_decl && !DECL_EXTERNAL (*node))))
4417 error ("%q+D in block scope inside of declare target directive",
4419 else if (TREE_CODE (*node) == VAR_DECL
4420 && !lang_hooks.types.omp_mappable_type (TREE_TYPE (*node)))
4421 error ("%q+D in declare target directive does not have mappable type",
4424 attributes = tree_cons (get_identifier ("omp declare target"),
4425 NULL_TREE, attributes);
4427 return decl_attributes (node, attributes, flags);
4431 /* Decode a declarator in an ordinary declaration or data definition.
4432 This is called as soon as the type information and variable name
4433 have been parsed, before parsing the initializer if any.
4434 Here we create the ..._DECL node, fill in its type,
4435 and put it on the list of decls for the current context.
4436 The ..._DECL node is returned as the value.
4438 Exception: for arrays where the length is not specified,
4439 the type is left null, to be filled in by `finish_decl'.
4441 Function definitions do not come here; they go to start_function
4442 instead. However, external and forward declarations of functions
4443 do go through here. Structure field declarations are done by
4444 grokfield and not through here. */
4447 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
4448 bool initialized, tree attributes)
4452 tree expr = NULL_TREE;
4453 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
4455 /* An object declared as __attribute__((deprecated)) suppresses
4456 warnings of uses of other deprecated items. */
4457 if (lookup_attribute ("deprecated", attributes))
4458 deprecated_state = DEPRECATED_SUPPRESS;
4460 decl = grokdeclarator (declarator, declspecs,
4461 NORMAL, initialized, NULL, &attributes, &expr, NULL,
4463 if (!decl || decl == error_mark_node)
4467 add_stmt (fold_convert (void_type_node, expr));
4469 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
4470 warning (OPT_Wmain, "%q+D is usually a function", decl);
4473 /* Is it valid for this decl to have an initializer at all?
4474 If not, set INITIALIZED to zero, which will indirectly
4475 tell 'finish_decl' to ignore the initializer once it is parsed. */
4476 switch (TREE_CODE (decl))
4479 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
4484 error ("function %qD is initialized like a variable", decl);
4489 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4490 error ("parameter %qD is initialized", decl);
4495 /* Don't allow initializations for incomplete types except for
4496 arrays which might be completed by the initialization. */
4498 /* This can happen if the array size is an undefined macro.
4499 We already gave a warning, so we don't need another one. */
4500 if (TREE_TYPE (decl) == error_mark_node)
4502 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
4504 /* A complete type is ok if size is fixed. */
4506 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
4507 || C_DECL_VARIABLE_SIZE (decl))
4509 error ("variable-sized object may not be initialized");
4513 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
4515 error ("variable %qD has initializer but incomplete type", decl);
4518 else if (C_DECL_VARIABLE_SIZE (decl))
4520 /* Although C99 is unclear about whether incomplete arrays
4521 of VLAs themselves count as VLAs, it does not make
4522 sense to permit them to be initialized given that
4523 ordinary VLAs may not be initialized. */
4524 error ("variable-sized object may not be initialized");
4531 if (current_scope == file_scope)
4532 TREE_STATIC (decl) = 1;
4534 /* Tell 'pushdecl' this is an initialized decl
4535 even though we don't yet have the initializer expression.
4536 Also tell 'finish_decl' it may store the real initializer. */
4537 DECL_INITIAL (decl) = error_mark_node;
4540 /* If this is a function declaration, write a record describing it to the
4541 prototypes file (if requested). */
4543 if (TREE_CODE (decl) == FUNCTION_DECL)
4544 gen_aux_info_record (decl, 0, 0, prototype_p (TREE_TYPE (decl)));
4546 /* ANSI specifies that a tentative definition which is not merged with
4547 a non-tentative definition behaves exactly like a definition with an
4548 initializer equal to zero. (Section 3.7.2)
4550 -fno-common gives strict ANSI behavior, though this tends to break
4551 a large body of code that grew up without this rule.
4553 Thread-local variables are never common, since there's no entrenched
4554 body of code to break, and it allows more efficient variable references
4555 in the presence of dynamic linking. */
4557 if (TREE_CODE (decl) == VAR_DECL
4559 && TREE_PUBLIC (decl)
4560 && !DECL_THREAD_LOCAL_P (decl)
4562 DECL_COMMON (decl) = 1;
4564 /* Set attributes here so if duplicate decl, will have proper attributes. */
4565 c_decl_attributes (&decl, attributes, 0);
4567 /* Handle gnu_inline attribute. */
4568 if (declspecs->inline_p
4569 && !flag_gnu89_inline
4570 && TREE_CODE (decl) == FUNCTION_DECL
4571 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
4572 || current_function_decl))
4574 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
4576 else if (declspecs->storage_class != csc_static)
4577 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
4580 if (TREE_CODE (decl) == FUNCTION_DECL
4581 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
4583 struct c_declarator *ce = declarator;
4585 if (ce->kind == cdk_pointer)
4586 ce = declarator->declarator;
4587 if (ce->kind == cdk_function)
4589 tree args = ce->u.arg_info->parms;
4590 for (; args; args = DECL_CHAIN (args))
4592 tree type = TREE_TYPE (args);
4593 if (type && INTEGRAL_TYPE_P (type)
4594 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4595 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
4600 if (TREE_CODE (decl) == FUNCTION_DECL
4601 && DECL_DECLARED_INLINE_P (decl)
4602 && DECL_UNINLINABLE (decl)
4603 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4604 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
4607 /* C99 6.7.4p3: An inline definition of a function with external
4608 linkage shall not contain a definition of a modifiable object
4609 with static storage duration... */
4610 if (TREE_CODE (decl) == VAR_DECL
4611 && current_scope != file_scope
4612 && TREE_STATIC (decl)
4613 && !TREE_READONLY (decl)
4614 && DECL_DECLARED_INLINE_P (current_function_decl)
4615 && DECL_EXTERNAL (current_function_decl))
4616 record_inline_static (input_location, current_function_decl,
4617 decl, csi_modifiable);
4619 if (c_dialect_objc ()
4620 && (TREE_CODE (decl) == VAR_DECL
4621 || TREE_CODE (decl) == FUNCTION_DECL))
4622 objc_check_global_decl (decl);
4624 /* Add this decl to the current scope.
4625 TEM may equal DECL or it may be a previous decl of the same name. */
4626 tem = pushdecl (decl);
4628 if (initialized && DECL_EXTERNAL (tem))
4630 DECL_EXTERNAL (tem) = 0;
4631 TREE_STATIC (tem) = 1;
4637 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4638 DECL or the non-array element type if DECL is an uninitialized array.
4639 If that type has a const member, diagnose this. */
4642 diagnose_uninitialized_cst_member (tree decl, tree type)
4645 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
4648 if (TREE_CODE (field) != FIELD_DECL)
4650 field_type = strip_array_types (TREE_TYPE (field));
4652 if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST)
4654 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4655 "uninitialized const member in %qT is invalid in C++",
4656 strip_array_types (TREE_TYPE (decl)));
4657 inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field);
4660 if (TREE_CODE (field_type) == RECORD_TYPE
4661 || TREE_CODE (field_type) == UNION_TYPE)
4662 diagnose_uninitialized_cst_member (decl, field_type);
4666 /* Finish processing of a declaration;
4667 install its initial value.
4668 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4669 If the length of an array type is not known before,
4670 it must be determined now, from the initial value, or it is an error.
4672 INIT_LOC is the location of the initial value. */
4675 finish_decl (tree decl, location_t init_loc, tree init,
4676 tree origtype, tree asmspec_tree)
4679 bool was_incomplete = (DECL_SIZE (decl) == 0);
4680 const char *asmspec = 0;
4682 /* If a name was specified, get the string. */
4683 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4684 && DECL_FILE_SCOPE_P (decl))
4685 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4687 asmspec = TREE_STRING_POINTER (asmspec_tree);
4689 if (TREE_CODE (decl) == VAR_DECL
4690 && TREE_STATIC (decl)
4691 && global_bindings_p ())
4692 /* So decl is a global variable. Record the types it uses
4693 so that we can decide later to emit debug info for them. */
4694 record_types_used_by_current_var_decl (decl);
4696 /* If `start_decl' didn't like having an initialization, ignore it now. */
4697 if (init != 0 && DECL_INITIAL (decl) == 0)
4700 /* Don't crash if parm is initialized. */
4701 if (TREE_CODE (decl) == PARM_DECL)
4705 store_init_value (init_loc, decl, init, origtype);
4707 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
4708 || TREE_CODE (decl) == FUNCTION_DECL
4709 || TREE_CODE (decl) == FIELD_DECL))
4710 objc_check_decl (decl);
4712 type = TREE_TYPE (decl);
4714 /* Deduce size of array from initialization, if not already known. */
4715 if (TREE_CODE (type) == ARRAY_TYPE
4716 && TYPE_DOMAIN (type) == 0
4717 && TREE_CODE (decl) != TYPE_DECL)
4720 = (TREE_STATIC (decl)
4721 /* Even if pedantic, an external linkage array
4722 may have incomplete type at first. */
4723 ? pedantic && !TREE_PUBLIC (decl)
4724 : !DECL_EXTERNAL (decl));
4726 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
4729 /* Get the completed type made by complete_array_type. */
4730 type = TREE_TYPE (decl);
4735 error ("initializer fails to determine size of %q+D", decl);
4740 error ("array size missing in %q+D", decl);
4741 /* If a `static' var's size isn't known,
4742 make it extern as well as static, so it does not get
4744 If it is not `static', then do not mark extern;
4745 finish_incomplete_decl will give it a default size
4746 and it will get allocated. */
4747 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4748 DECL_EXTERNAL (decl) = 1;
4752 error ("zero or negative size array %q+D", decl);
4756 /* For global variables, update the copy of the type that
4757 exists in the binding. */
4758 if (TREE_PUBLIC (decl))
4760 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
4761 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
4762 b_ext = b_ext->shadowed;
4765 if (b_ext->u.type && comptypes (b_ext->u.type, type))
4766 b_ext->u.type = composite_type (b_ext->u.type, type);
4768 b_ext->u.type = type;
4777 if (DECL_INITIAL (decl))
4778 TREE_TYPE (DECL_INITIAL (decl)) = type;
4780 relayout_decl (decl);
4783 if (TREE_CODE (decl) == VAR_DECL)
4785 if (init && TREE_CODE (init) == CONSTRUCTOR)
4786 add_flexible_array_elts_to_size (decl, init);
4788 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
4789 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
4790 layout_decl (decl, 0);
4792 if (DECL_SIZE (decl) == 0
4793 /* Don't give an error if we already gave one earlier. */
4794 && TREE_TYPE (decl) != error_mark_node
4795 && (TREE_STATIC (decl)
4796 /* A static variable with an incomplete type
4797 is an error if it is initialized.
4798 Also if it is not file scope.
4799 Otherwise, let it through, but if it is not `extern'
4800 then it may cause an error message later. */
4801 ? (DECL_INITIAL (decl) != 0
4802 || !DECL_FILE_SCOPE_P (decl))
4803 /* An automatic variable with an incomplete type
4805 : !DECL_EXTERNAL (decl)))
4807 error ("storage size of %q+D isn%'t known", decl);
4808 TREE_TYPE (decl) = error_mark_node;
4811 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4812 && DECL_SIZE (decl) != 0)
4814 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4815 constant_expression_warning (DECL_SIZE (decl));
4818 error ("storage size of %q+D isn%'t constant", decl);
4819 TREE_TYPE (decl) = error_mark_node;
4823 if (TREE_USED (type))
4825 TREE_USED (decl) = 1;
4826 DECL_READ_P (decl) = 1;
4830 /* If this is a function and an assembler name is specified, reset DECL_RTL
4831 so we can give it its new name. Also, update builtin_decl if it
4832 was a normal built-in. */
4833 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4835 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4836 set_builtin_user_assembler_name (decl, asmspec);
4837 set_user_assembler_name (decl, asmspec);
4840 /* If #pragma weak was used, mark the decl weak now. */
4841 maybe_apply_pragma_weak (decl);
4843 /* Output the assembler code and/or RTL code for variables and functions,
4844 unless the type is an undefined structure or union.
4845 If not, it will get done when the type is completed. */
4847 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4849 /* Determine the ELF visibility. */
4850 if (TREE_PUBLIC (decl))
4851 c_determine_visibility (decl);
4853 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4854 if (c_dialect_objc ())
4855 objc_check_decl (decl);
4859 /* If this is not a static variable, issue a warning.
4860 It doesn't make any sense to give an ASMSPEC for an
4861 ordinary, non-register local variable. Historically,
4862 GCC has accepted -- but ignored -- the ASMSPEC in
4864 if (!DECL_FILE_SCOPE_P (decl)
4865 && TREE_CODE (decl) == VAR_DECL
4866 && !C_DECL_REGISTER (decl)
4867 && !TREE_STATIC (decl))
4868 warning (0, "ignoring asm-specifier for non-static local "
4869 "variable %q+D", decl);
4871 set_user_assembler_name (decl, asmspec);
4874 if (DECL_FILE_SCOPE_P (decl))
4876 if (DECL_INITIAL (decl) == NULL_TREE
4877 || DECL_INITIAL (decl) == error_mark_node)
4878 /* Don't output anything
4879 when a tentative file-scope definition is seen.
4880 But at end of compilation, do output code for them. */
4881 DECL_DEFER_OUTPUT (decl) = 1;
4882 if (asmspec && C_DECL_REGISTER (decl))
4883 DECL_HARD_REGISTER (decl) = 1;
4884 rest_of_decl_compilation (decl, true, 0);
4888 /* In conjunction with an ASMSPEC, the `register'
4889 keyword indicates that we should place the variable
4890 in a particular register. */
4891 if (asmspec && C_DECL_REGISTER (decl))
4893 DECL_HARD_REGISTER (decl) = 1;
4894 /* This cannot be done for a structure with volatile
4895 fields, on which DECL_REGISTER will have been
4897 if (!DECL_REGISTER (decl))
4898 error ("cannot put object with volatile field into register");
4901 if (TREE_CODE (decl) != FUNCTION_DECL)
4903 /* If we're building a variable sized type, and we might be
4904 reachable other than via the top of the current binding
4905 level, then create a new BIND_EXPR so that we deallocate
4906 the object at the right time. */
4907 /* Note that DECL_SIZE can be null due to errors. */
4908 if (DECL_SIZE (decl)
4909 && !TREE_CONSTANT (DECL_SIZE (decl))
4910 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
4913 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
4914 TREE_SIDE_EFFECTS (bind) = 1;
4916 BIND_EXPR_BODY (bind) = push_stmt_list ();
4918 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
4924 if (!DECL_FILE_SCOPE_P (decl))
4926 /* Recompute the RTL of a local array now
4927 if it used to be an incomplete type. */
4929 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
4931 /* If we used it already as memory, it must stay in memory. */
4932 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4933 /* If it's still incomplete now, no init will save it. */
4934 if (DECL_SIZE (decl) == 0)
4935 DECL_INITIAL (decl) = 0;
4940 if (TREE_CODE (decl) == TYPE_DECL)
4942 if (!DECL_FILE_SCOPE_P (decl)
4943 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
4944 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
4946 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
4949 /* Install a cleanup (aka destructor) if one was given. */
4950 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
4952 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
4955 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
4956 tree cleanup_decl = lookup_name (cleanup_id);
4958 vec<tree, va_gc> *v;
4960 /* Build "cleanup(&decl)" for the destructor. */
4961 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
4963 v->quick_push (cleanup);
4964 cleanup = c_build_function_call_vec (DECL_SOURCE_LOCATION (decl),
4965 vNULL, cleanup_decl, v, NULL);
4968 /* Don't warn about decl unused; the cleanup uses it. */
4969 TREE_USED (decl) = 1;
4970 TREE_USED (cleanup_decl) = 1;
4971 DECL_READ_P (decl) = 1;
4973 push_cleanup (decl, cleanup, false);
4978 && TREE_CODE (decl) == VAR_DECL
4979 && !DECL_EXTERNAL (decl)
4980 && DECL_INITIAL (decl) == NULL_TREE)
4982 type = strip_array_types (type);
4983 if (TREE_READONLY (decl))
4984 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4985 "uninitialized const %qD is invalid in C++", decl);
4986 else if ((TREE_CODE (type) == RECORD_TYPE
4987 || TREE_CODE (type) == UNION_TYPE)
4988 && C_TYPE_FIELDS_READONLY (type))
4989 diagnose_uninitialized_cst_member (decl, type);
4992 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
4995 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4996 EXPR is NULL or a pointer to an expression that needs to be
4997 evaluated for the side effects of array size expressions in the
5001 grokparm (const struct c_parm *parm, tree *expr)
5003 tree attrs = parm->attrs;
5004 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
5005 NULL, &attrs, expr, NULL, DEPRECATED_NORMAL);
5007 decl_attributes (&decl, attrs, 0);
5012 /* Given a parsed parameter declaration, decode it into a PARM_DECL
5013 and push that on the current scope. EXPR is a pointer to an
5014 expression that needs to be evaluated for the side effects of array
5015 size expressions in the parameters. */
5018 push_parm_decl (const struct c_parm *parm, tree *expr)
5020 tree attrs = parm->attrs;
5023 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
5024 &attrs, expr, NULL, DEPRECATED_NORMAL);
5025 decl_attributes (&decl, attrs, 0);
5027 decl = pushdecl (decl);
5029 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
5032 /* Mark all the parameter declarations to date as forward decls.
5033 Also diagnose use of this extension. */
5036 mark_forward_parm_decls (void)
5038 struct c_binding *b;
5040 if (pedantic && !current_scope->warned_forward_parm_decls)
5042 pedwarn (input_location, OPT_Wpedantic,
5043 "ISO C forbids forward parameter declarations");
5044 current_scope->warned_forward_parm_decls = true;
5047 for (b = current_scope->bindings; b; b = b->prev)
5048 if (TREE_CODE (b->decl) == PARM_DECL)
5049 TREE_ASM_WRITTEN (b->decl) = 1;
5052 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5053 literal, which may be an incomplete array type completed by the
5054 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5055 literal. NON_CONST is true if the initializers contain something
5056 that cannot occur in a constant expression. */
5059 build_compound_literal (location_t loc, tree type, tree init, bool non_const)
5061 /* We do not use start_decl here because we have a type, not a declarator;
5062 and do not use finish_decl because the decl should be stored inside
5063 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5068 if (type == error_mark_node
5069 || init == error_mark_node)
5070 return error_mark_node;
5072 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
5073 DECL_EXTERNAL (decl) = 0;
5074 TREE_PUBLIC (decl) = 0;
5075 TREE_STATIC (decl) = (current_scope == file_scope);
5076 DECL_CONTEXT (decl) = current_function_decl;
5077 TREE_USED (decl) = 1;
5078 DECL_READ_P (decl) = 1;
5079 TREE_TYPE (decl) = type;
5080 TREE_READONLY (decl) = (TYPE_READONLY (type)
5081 || (TREE_CODE (type) == ARRAY_TYPE
5082 && TYPE_READONLY (TREE_TYPE (type))));
5083 store_init_value (loc, decl, init, NULL_TREE);
5085 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
5087 int failure = complete_array_type (&TREE_TYPE (decl),
5088 DECL_INITIAL (decl), true);
5089 /* If complete_array_type returns 3, it means that the
5090 initial value of the compound literal is empty. Allow it. */
5091 gcc_assert (failure == 0 || failure == 3);
5093 type = TREE_TYPE (decl);
5094 TREE_TYPE (DECL_INITIAL (decl)) = type;
5097 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
5099 c_incomplete_type_error (NULL_TREE, type);
5100 return error_mark_node;
5103 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
5104 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
5105 TREE_SIDE_EFFECTS (complit) = 1;
5107 layout_decl (decl, 0);
5109 if (TREE_STATIC (decl))
5111 /* This decl needs a name for the assembler output. */
5112 set_compound_literal_name (decl);
5113 DECL_DEFER_OUTPUT (decl) = 1;
5114 DECL_COMDAT (decl) = 1;
5115 DECL_ARTIFICIAL (decl) = 1;
5116 DECL_IGNORED_P (decl) = 1;
5118 rest_of_decl_compilation (decl, 1, 0);
5123 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
5124 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
5130 /* Check the type of a compound literal. Here we just check that it
5131 is valid for C++. */
5134 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
5137 && (type_name->specs->typespec_kind == ctsk_tagdef
5138 || type_name->specs->typespec_kind == ctsk_tagfirstref))
5139 warning_at (loc, OPT_Wc___compat,
5140 "defining a type in a compound literal is invalid in C++");
5143 /* Determine whether TYPE is a structure with a flexible array member,
5144 or a union containing such a structure (possibly recursively). */
5147 flexible_array_type_p (tree type)
5150 switch (TREE_CODE (type))
5153 x = TYPE_FIELDS (type);
5156 while (DECL_CHAIN (x) != NULL_TREE)
5158 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5159 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5160 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5161 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5165 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x))
5167 if (flexible_array_type_p (TREE_TYPE (x)))
5176 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
5177 replacing with appropriate values if they are invalid. */
5179 check_bitfield_type_and_width (tree *type, tree *width, tree orig_name)
5182 unsigned int max_width;
5183 unsigned HOST_WIDE_INT w;
5184 const char *name = (orig_name
5185 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
5186 : _("<anonymous>"));
5188 /* Detect and ignore out of range field width and process valid
5190 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)))
5192 error ("bit-field %qs width not an integer constant", name);
5193 *width = integer_one_node;
5197 if (TREE_CODE (*width) != INTEGER_CST)
5199 *width = c_fully_fold (*width, false, NULL);
5200 if (TREE_CODE (*width) == INTEGER_CST)
5201 pedwarn (input_location, OPT_Wpedantic,
5202 "bit-field %qs width not an integer constant expression",
5205 if (TREE_CODE (*width) != INTEGER_CST)
5207 error ("bit-field %qs width not an integer constant", name);
5208 *width = integer_one_node;
5210 constant_expression_warning (*width);
5211 if (tree_int_cst_sgn (*width) < 0)
5213 error ("negative width in bit-field %qs", name);
5214 *width = integer_one_node;
5216 else if (integer_zerop (*width) && orig_name)
5218 error ("zero width for bit-field %qs", name);
5219 *width = integer_one_node;
5223 /* Detect invalid bit-field type. */
5224 if (TREE_CODE (*type) != INTEGER_TYPE
5225 && TREE_CODE (*type) != BOOLEAN_TYPE
5226 && TREE_CODE (*type) != ENUMERAL_TYPE)
5228 error ("bit-field %qs has invalid type", name);
5229 *type = unsigned_type_node;
5232 type_mv = TYPE_MAIN_VARIANT (*type);
5233 if (!in_system_header_at (input_location)
5234 && type_mv != integer_type_node
5235 && type_mv != unsigned_type_node
5236 && type_mv != boolean_type_node)
5237 pedwarn_c90 (input_location, OPT_Wpedantic,
5238 "type of bit-field %qs is a GCC extension", name);
5240 max_width = TYPE_PRECISION (*type);
5242 if (0 < compare_tree_int (*width, max_width))
5244 error ("width of %qs exceeds its type", name);
5246 *width = build_int_cst (integer_type_node, w);
5249 w = tree_to_uhwi (*width);
5251 if (TREE_CODE (*type) == ENUMERAL_TYPE)
5253 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
5255 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_SIGN (*type))
5256 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_SIGN (*type)))
5257 warning (0, "%qs is narrower than values of its type", name);
5263 /* Print warning about variable length array if necessary. */
5266 warn_variable_length_array (tree name, tree size)
5268 if (TREE_CONSTANT (size))
5271 pedwarn_c90 (input_location, OPT_Wvla,
5272 "ISO C90 forbids array %qE whose size "
5273 "can%'t be evaluated", name);
5275 pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids array "
5276 "whose size can%'t be evaluated");
5281 pedwarn_c90 (input_location, OPT_Wvla,
5282 "ISO C90 forbids variable length array %qE", name);
5284 pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids variable "
5289 /* Print warning about defaulting to int if necessary. */
5292 warn_defaults_to (location_t location, int opt, const char *gmsgid, ...)
5294 diagnostic_info diagnostic;
5297 va_start (ap, gmsgid);
5298 diagnostic_set_info (&diagnostic, gmsgid, &ap, location,
5299 flag_isoc99 ? DK_PEDWARN : DK_WARNING);
5300 diagnostic.option_index = opt;
5301 report_diagnostic (&diagnostic);
5305 /* Given declspecs and a declarator,
5306 determine the name and type of the object declared
5307 and construct a ..._DECL node for it.
5308 (In one case we can return a ..._TYPE node instead.
5309 For invalid input we sometimes return 0.)
5311 DECLSPECS is a c_declspecs structure for the declaration specifiers.
5313 DECL_CONTEXT says which syntactic context this declaration is in:
5314 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
5315 FUNCDEF for a function definition. Like NORMAL but a few different
5316 error messages in each case. Return value may be zero meaning
5317 this definition is too screwy to try to parse.
5318 PARM for a parameter declaration (either within a function prototype
5319 or before a function body). Make a PARM_DECL, or return void_type_node.
5320 TYPENAME if for a typename (in a cast or sizeof).
5321 Don't make a DECL node; just return the ..._TYPE node.
5322 FIELD for a struct or union field; make a FIELD_DECL.
5323 INITIALIZED is true if the decl has an initializer.
5324 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
5325 representing the width of the bit-field.
5326 DECL_ATTRS points to the list of attributes that should be added to this
5327 decl. Any nested attributes that belong on the decl itself will be
5329 If EXPR is not NULL, any expressions that need to be evaluated as
5330 part of evaluating variably modified types will be stored in *EXPR.
5331 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
5332 set to indicate whether operands in *EXPR can be used in constant
5334 DEPRECATED_STATE is a deprecated_states value indicating whether
5335 deprecation warnings should be suppressed.
5337 In the TYPENAME case, DECLARATOR is really an absolute declarator.
5338 It may also be so in the PARM case, for a prototype where the
5339 argument type is specified but not the name.
5341 This function is where the complicated C meanings of `static'
5342 and `extern' are interpreted. */
5345 grokdeclarator (const struct c_declarator *declarator,
5346 struct c_declspecs *declspecs,
5347 enum decl_context decl_context, bool initialized, tree *width,
5348 tree *decl_attrs, tree *expr, bool *expr_const_operands,
5349 enum deprecated_states deprecated_state)
5351 tree type = declspecs->type;
5352 bool threadp = declspecs->thread_p;
5353 enum c_storage_class storage_class = declspecs->storage_class;
5358 int type_quals = TYPE_UNQUALIFIED;
5359 tree name = NULL_TREE;
5360 bool funcdef_flag = false;
5361 bool funcdef_syntax = false;
5362 bool size_varies = false;
5363 tree decl_attr = declspecs->decl_attr;
5364 int array_ptr_quals = TYPE_UNQUALIFIED;
5365 tree array_ptr_attrs = NULL_TREE;
5366 int array_parm_static = 0;
5367 bool array_parm_vla_unspec_p = false;
5368 tree returned_attrs = NULL_TREE;
5369 bool bitfield = width != NULL;
5371 struct c_arg_info *arg_info = 0;
5372 addr_space_t as1, as2, address_space;
5373 location_t loc = UNKNOWN_LOCATION;
5376 bool expr_const_operands_dummy;
5377 enum c_declarator_kind first_non_attr_kind;
5378 unsigned int alignas_align = 0;
5380 if (TREE_CODE (type) == ERROR_MARK)
5381 return error_mark_node;
5384 if (expr_const_operands == NULL)
5385 expr_const_operands = &expr_const_operands_dummy;
5387 *expr = declspecs->expr;
5388 *expr_const_operands = declspecs->expr_const_operands;
5390 if (decl_context == FUNCDEF)
5391 funcdef_flag = true, decl_context = NORMAL;
5393 /* Look inside a declarator for the name being declared
5394 and get it as an IDENTIFIER_NODE, for an error message. */
5396 const struct c_declarator *decl = declarator;
5398 first_non_attr_kind = cdk_attrs;
5408 funcdef_syntax = (decl->kind == cdk_function);
5409 decl = decl->declarator;
5410 if (first_non_attr_kind == cdk_attrs)
5411 first_non_attr_kind = decl->kind;
5415 decl = decl->declarator;
5422 if (first_non_attr_kind == cdk_attrs)
5423 first_non_attr_kind = decl->kind;
5432 gcc_assert (decl_context == PARM
5433 || decl_context == TYPENAME
5434 || (decl_context == FIELD
5435 && declarator->kind == cdk_id));
5436 gcc_assert (!initialized);
5440 /* A function definition's declarator must have the form of
5441 a function declarator. */
5443 if (funcdef_flag && !funcdef_syntax)
5446 /* If this looks like a function definition, make it one,
5447 even if it occurs where parms are expected.
5448 Then store_parm_decls will reject it and not use it as a parm. */
5449 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
5450 decl_context = PARM;
5452 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
5453 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
5455 if ((decl_context == NORMAL || decl_context == FIELD)
5456 && current_scope == file_scope
5457 && variably_modified_type_p (type, NULL_TREE))
5460 error_at (loc, "variably modified %qE at file scope", name);
5462 error_at (loc, "variably modified field at file scope");
5463 type = integer_type_node;
5466 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
5468 /* Diagnose defaulting to "int". */
5470 if (declspecs->default_int_p && !in_system_header_at (input_location))
5472 /* Issue a warning if this is an ISO C 99 program or if
5473 -Wreturn-type and this is a function, or if -Wimplicit;
5474 prefer the former warning since it is more explicit. */
5475 if ((warn_implicit_int || warn_return_type || flag_isoc99)
5477 warn_about_return_type = 1;
5481 warn_defaults_to (loc, OPT_Wimplicit_int,
5482 "type defaults to %<int%> in declaration "
5485 warn_defaults_to (loc, OPT_Wimplicit_int,
5486 "type defaults to %<int%> in type name");
5490 /* Adjust the type if a bit-field is being declared,
5491 -funsigned-bitfields applied and the type is not explicitly
5493 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
5494 && TREE_CODE (type) == INTEGER_TYPE)
5495 type = unsigned_type_for (type);
5497 /* Figure out the type qualifiers for the declaration. There are
5498 two ways a declaration can become qualified. One is something
5499 like `const int i' where the `const' is explicit. Another is
5500 something like `typedef const int CI; CI i' where the type of the
5501 declaration contains the `const'. A third possibility is that
5502 there is a type qualifier on the element type of a typedefed
5503 array type, in which case we should extract that qualifier so
5504 that c_apply_type_quals_to_decl receives the full list of
5505 qualifiers to work with (C90 is not entirely clear about whether
5506 duplicate qualifiers should be diagnosed in this case, but it
5507 seems most appropriate to do so). */
5508 element_type = strip_array_types (type);
5509 constp = declspecs->const_p + TYPE_READONLY (element_type);
5510 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
5511 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
5512 atomicp = declspecs->atomic_p + TYPE_ATOMIC (element_type);
5513 as1 = declspecs->address_space;
5514 as2 = TYPE_ADDR_SPACE (element_type);
5515 address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1;
5518 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<const%>");
5520 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<restrict%>");
5522 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<volatile%>");
5524 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<_Atomic%>");
5526 if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2)
5527 error_at (loc, "conflicting named address spaces (%s vs %s)",
5528 c_addr_space_name (as1), c_addr_space_name (as2));
5530 if ((TREE_CODE (type) == ARRAY_TYPE
5531 || first_non_attr_kind == cdk_array)
5532 && TYPE_QUALS (element_type))
5533 type = TYPE_MAIN_VARIANT (type);
5534 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
5535 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
5536 | (volatilep ? TYPE_QUAL_VOLATILE : 0)
5537 | (atomicp ? TYPE_QUAL_ATOMIC : 0)
5538 | ENCODE_QUAL_ADDR_SPACE (address_space));
5540 /* Applying the _Atomic qualifier to an array type (through the use
5541 of typedefs or typeof) must be detected here. If the qualifier
5542 is introduced later, any appearance of applying it to an array is
5543 actually applying it to an element of that array. */
5544 if (atomicp && TREE_CODE (type) == ARRAY_TYPE)
5545 error_at (loc, "%<_Atomic%>-qualified array type");
5547 /* Warn about storage classes that are invalid for certain
5548 kinds of declarations (parameters, typenames, etc.). */
5552 || storage_class == csc_auto
5553 || storage_class == csc_register
5554 || storage_class == csc_typedef))
5556 if (storage_class == csc_auto)
5558 (current_scope == file_scope) ? 0 : OPT_Wpedantic,
5559 "function definition declared %<auto%>");
5560 if (storage_class == csc_register)
5561 error_at (loc, "function definition declared %<register%>");
5562 if (storage_class == csc_typedef)
5563 error_at (loc, "function definition declared %<typedef%>");
5565 error_at (loc, "function definition declared %qs",
5566 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
5568 if (storage_class == csc_auto
5569 || storage_class == csc_register
5570 || storage_class == csc_typedef)
5571 storage_class = csc_none;
5573 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
5575 if (decl_context == PARM && storage_class == csc_register)
5579 switch (decl_context)
5583 error_at (loc, "storage class specified for structure "
5586 error_at (loc, "storage class specified for structure field");
5590 error_at (loc, "storage class specified for parameter %qE",
5593 error_at (loc, "storage class specified for unnamed parameter");
5596 error_at (loc, "storage class specified for typename");
5599 storage_class = csc_none;
5603 else if (storage_class == csc_extern
5607 /* 'extern' with initialization is invalid if not at file scope. */
5608 if (current_scope == file_scope)
5610 /* It is fine to have 'extern const' when compiling at C
5611 and C++ intersection. */
5612 if (!(warn_cxx_compat && constp))
5613 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
5617 error_at (loc, "%qE has both %<extern%> and initializer", name);
5619 else if (current_scope == file_scope)
5621 if (storage_class == csc_auto)
5622 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
5624 if (pedantic && storage_class == csc_register)
5625 pedwarn (input_location, OPT_Wpedantic,
5626 "file-scope declaration of %qE specifies %<register%>", name);
5630 if (storage_class == csc_extern && funcdef_flag)
5631 error_at (loc, "nested function %qE declared %<extern%>", name);
5632 else if (threadp && storage_class == csc_none)
5634 error_at (loc, "function-scope %qE implicitly auto and declared "
5636 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
5641 /* Now figure out the structure of the declarator proper.
5642 Descend through it, creating more complex types, until we reach
5643 the declared identifier (or NULL_TREE, in an absolute declarator).
5644 At each stage we maintain an unqualified version of the type
5645 together with any qualifiers that should be applied to it with
5646 c_build_qualified_type; this way, array types including
5647 multidimensional array types are first built up in unqualified
5648 form and then the qualified form is created with
5649 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5651 while (declarator && declarator->kind != cdk_id)
5653 if (type == error_mark_node)
5655 declarator = declarator->declarator;
5659 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5660 a cdk_pointer (for *...),
5661 a cdk_function (for ...(...)),
5662 a cdk_attrs (for nested attributes),
5663 or a cdk_id (for the name being declared
5664 or the place in an absolute declarator
5665 where the name was omitted).
5666 For the last case, we have just exited the loop.
5668 At this point, TYPE is the type of elements of an array,
5669 or for a function to return, or for a pointer to point to.
5670 After this sequence of ifs, TYPE is the type of the
5671 array or function or pointer, and DECLARATOR has had its
5672 outermost layer removed. */
5674 if (array_ptr_quals != TYPE_UNQUALIFIED
5675 || array_ptr_attrs != NULL_TREE
5676 || array_parm_static)
5678 /* Only the innermost declarator (making a parameter be of
5679 array type which is converted to pointer type)
5680 may have static or type qualifiers. */
5681 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5682 array_ptr_quals = TYPE_UNQUALIFIED;
5683 array_ptr_attrs = NULL_TREE;
5684 array_parm_static = 0;
5687 switch (declarator->kind)
5691 /* A declarator with embedded attributes. */
5692 tree attrs = declarator->u.attrs;
5693 const struct c_declarator *inner_decl;
5695 declarator = declarator->declarator;
5696 inner_decl = declarator;
5697 while (inner_decl->kind == cdk_attrs)
5698 inner_decl = inner_decl->declarator;
5699 if (inner_decl->kind == cdk_id)
5700 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
5701 else if (inner_decl->kind == cdk_function)
5702 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
5703 else if (inner_decl->kind == cdk_array)
5704 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
5705 returned_attrs = decl_attributes (&type,
5706 chainon (returned_attrs, attrs),
5712 tree itype = NULL_TREE;
5713 tree size = declarator->u.array.dimen;
5714 /* The index is a signed object `sizetype' bits wide. */
5715 tree index_type = c_common_signed_type (sizetype);
5717 array_ptr_quals = declarator->u.array.quals;
5718 array_ptr_attrs = declarator->u.array.attrs;
5719 array_parm_static = declarator->u.array.static_p;
5720 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
5722 declarator = declarator->declarator;
5724 /* Check for some types that there cannot be arrays of. */
5726 if (VOID_TYPE_P (type))
5729 error_at (loc, "declaration of %qE as array of voids", name);
5731 error_at (loc, "declaration of type name as array of voids");
5732 type = error_mark_node;
5735 if (TREE_CODE (type) == FUNCTION_TYPE)
5738 error_at (loc, "declaration of %qE as array of functions",
5741 error_at (loc, "declaration of type name as array of "
5743 type = error_mark_node;
5746 if (pedantic && !in_system_header_at (input_location)
5747 && flexible_array_type_p (type))
5748 pedwarn (loc, OPT_Wpedantic,
5749 "invalid use of structure with flexible array member");
5751 if (size == error_mark_node)
5752 type = error_mark_node;
5754 if (type == error_mark_node)
5757 /* If size was specified, set ITYPE to a range-type for
5758 that size. Otherwise, ITYPE remains null. finish_decl
5759 may figure it out from an initial value. */
5763 bool size_maybe_const = true;
5764 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
5765 && !TREE_OVERFLOW (size));
5766 bool this_size_varies = false;
5768 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5770 STRIP_TYPE_NOPS (size);
5772 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
5775 error_at (loc, "size of array %qE has non-integer type",
5779 "size of unnamed array has non-integer type");
5780 size = integer_one_node;
5783 size = c_fully_fold (size, false, &size_maybe_const);
5785 if (pedantic && size_maybe_const && integer_zerop (size))
5788 pedwarn (loc, OPT_Wpedantic,
5789 "ISO C forbids zero-size array %qE", name);
5791 pedwarn (loc, OPT_Wpedantic,
5792 "ISO C forbids zero-size array");
5795 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
5797 constant_expression_warning (size);
5798 if (tree_int_cst_sgn (size) < 0)
5801 error_at (loc, "size of array %qE is negative", name);
5803 error_at (loc, "size of unnamed array is negative");
5804 size = integer_one_node;
5806 /* Handle a size folded to an integer constant but
5807 not an integer constant expression. */
5808 if (!size_int_const)
5810 /* If this is a file scope declaration of an
5811 ordinary identifier, this is invalid code;
5812 diagnosing it here and not subsequently
5813 treating the type as variable-length avoids
5814 more confusing diagnostics later. */
5815 if ((decl_context == NORMAL || decl_context == FIELD)
5816 && current_scope == file_scope)
5817 pedwarn (input_location, 0,
5818 "variably modified %qE at file scope",
5821 this_size_varies = size_varies = true;
5822 warn_variable_length_array (name, size);
5825 else if ((decl_context == NORMAL || decl_context == FIELD)
5826 && current_scope == file_scope)
5828 error_at (loc, "variably modified %qE at file scope", name);
5829 size = integer_one_node;
5833 /* Make sure the array size remains visibly
5834 nonconstant even if it is (eg) a const variable
5835 with known value. */
5836 this_size_varies = size_varies = true;
5837 warn_variable_length_array (name, size);
5838 if (flag_sanitize & SANITIZE_VLA
5839 && decl_context == NORMAL
5840 && do_ubsan_in_current_function ())
5842 /* Evaluate the array size only once. */
5843 size = c_save_expr (size);
5844 size = c_fully_fold (size, false, NULL);
5845 size = fold_build2 (COMPOUND_EXPR, TREE_TYPE (size),
5846 ubsan_instrument_vla (loc, size),
5851 if (integer_zerop (size) && !this_size_varies)
5853 /* A zero-length array cannot be represented with
5854 an unsigned index type, which is what we'll
5855 get with build_index_type. Create an
5856 open-ended range instead. */
5857 itype = build_range_type (sizetype, size, NULL_TREE);
5861 /* Arrange for the SAVE_EXPR on the inside of the
5862 MINUS_EXPR, which allows the -1 to get folded
5863 with the +1 that happens when building TYPE_SIZE. */
5865 size = save_expr (size);
5866 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
5867 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5868 integer_zero_node, size);
5870 /* Compute the maximum valid index, that is, size
5871 - 1. Do the calculation in index_type, so that
5872 if it is a variable the computations will be
5873 done in the proper mode. */
5874 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
5875 convert (index_type, size),
5876 convert (index_type,
5879 /* The above overflows when size does not fit
5881 ??? While a size of INT_MAX+1 technically shouldn't
5882 cause an overflow (because we subtract 1), handling
5883 this case seems like an unnecessary complication. */
5884 if (TREE_CODE (size) == INTEGER_CST
5885 && !int_fits_type_p (size, index_type))
5888 error_at (loc, "size of array %qE is too large",
5891 error_at (loc, "size of unnamed array is too large");
5892 type = error_mark_node;
5896 itype = build_index_type (itype);
5898 if (this_size_varies)
5901 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5905 *expr_const_operands &= size_maybe_const;
5908 else if (decl_context == FIELD)
5910 bool flexible_array_member = false;
5911 if (array_parm_vla_unspec_p)
5912 /* Field names can in fact have function prototype
5913 scope so [*] is disallowed here through making
5914 the field variably modified, not through being
5915 something other than a declaration with function
5920 const struct c_declarator *t = declarator;
5921 while (t->kind == cdk_attrs)
5923 flexible_array_member = (t->kind == cdk_id);
5925 if (flexible_array_member
5926 && !in_system_header_at (input_location))
5927 pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not "
5928 "support flexible array members");
5930 /* ISO C99 Flexible array members are effectively
5931 identical to GCC's zero-length array extension. */
5932 if (flexible_array_member || array_parm_vla_unspec_p)
5933 itype = build_range_type (sizetype, size_zero_node,
5936 else if (decl_context == PARM)
5938 if (array_parm_vla_unspec_p)
5940 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
5944 else if (decl_context == TYPENAME)
5946 if (array_parm_vla_unspec_p)
5949 warning (0, "%<[*]%> not in a declaration");
5950 /* We use this to avoid messing up with incomplete
5951 array types of the same type, that would
5952 otherwise be modified below. */
5953 itype = build_range_type (sizetype, size_zero_node,
5959 /* Complain about arrays of incomplete types. */
5960 if (!COMPLETE_TYPE_P (type))
5962 error_at (loc, "array type has incomplete element type %qT",
5964 type = error_mark_node;
5967 /* When itype is NULL, a shared incomplete array type is
5968 returned for all array of a given type. Elsewhere we
5969 make sure we don't complete that type before copying
5970 it, but here we want to make sure we don't ever
5971 modify the shared type, so we gcc_assert (itype)
5974 addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals);
5975 if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type))
5976 type = build_qualified_type (type,
5977 ENCODE_QUAL_ADDR_SPACE (as));
5979 type = build_array_type (type, itype);
5982 if (type != error_mark_node)
5986 /* It is ok to modify type here even if itype is
5987 NULL: if size_varies, we're in a
5988 multi-dimensional array and the inner type has
5989 variable size, so the enclosing shared array type
5991 if (size && TREE_CODE (size) == INTEGER_CST)
5993 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5994 C_TYPE_VARIABLE_SIZE (type) = 1;
5997 /* The GCC extension for zero-length arrays differs from
5998 ISO flexible array members in that sizeof yields
6000 if (size && integer_zerop (size))
6003 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
6004 TYPE_SIZE (type) = bitsize_zero_node;
6005 TYPE_SIZE_UNIT (type) = size_zero_node;
6006 SET_TYPE_STRUCTURAL_EQUALITY (type);
6008 if (array_parm_vla_unspec_p)
6011 /* The type is complete. C99 6.7.5.2p4 */
6012 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
6013 TYPE_SIZE (type) = bitsize_zero_node;
6014 TYPE_SIZE_UNIT (type) = size_zero_node;
6015 SET_TYPE_STRUCTURAL_EQUALITY (type);
6019 if (decl_context != PARM
6020 && (array_ptr_quals != TYPE_UNQUALIFIED
6021 || array_ptr_attrs != NULL_TREE
6022 || array_parm_static))
6024 error_at (loc, "static or type qualifiers in non-parameter array declarator");
6025 array_ptr_quals = TYPE_UNQUALIFIED;
6026 array_ptr_attrs = NULL_TREE;
6027 array_parm_static = 0;
6033 /* Say it's a definition only for the declarator closest
6034 to the identifier, apart possibly from some
6036 bool really_funcdef = false;
6040 const struct c_declarator *t = declarator->declarator;
6041 while (t->kind == cdk_attrs)
6043 really_funcdef = (t->kind == cdk_id);
6046 /* Declaring a function type. Make sure we have a valid
6047 type for the function to return. */
6048 if (type == error_mark_node)
6051 size_varies = false;
6053 /* Warn about some types functions can't return. */
6054 if (TREE_CODE (type) == FUNCTION_TYPE)
6057 error_at (loc, "%qE declared as function returning a "
6060 error_at (loc, "type name declared as function "
6061 "returning a function");
6062 type = integer_type_node;
6064 if (TREE_CODE (type) == ARRAY_TYPE)
6067 error_at (loc, "%qE declared as function returning an array",
6070 error_at (loc, "type name declared as function returning "
6072 type = integer_type_node;
6074 errmsg = targetm.invalid_return_type (type);
6078 type = integer_type_node;
6081 /* Construct the function type and go to the next
6082 inner layer of declarator. */
6083 arg_info = declarator->u.arg_info;
6084 arg_types = grokparms (arg_info, really_funcdef);
6086 /* Type qualifiers before the return type of the function
6087 qualify the return type, not the function type. */
6090 /* Type qualifiers on a function return type are
6091 normally permitted by the standard but have no
6092 effect, so give a warning at -Wreturn-type.
6093 Qualifiers on a void return type are banned on
6094 function definitions in ISO C; GCC used to used
6095 them for noreturn functions. */
6096 if (VOID_TYPE_P (type) && really_funcdef)
6098 "function definition has qualified void return type");
6100 warning_at (loc, OPT_Wignored_qualifiers,
6101 "type qualifiers ignored on function return type");
6103 type = c_build_qualified_type (type, type_quals);
6105 type_quals = TYPE_UNQUALIFIED;
6107 type = build_function_type (type, arg_types);
6108 declarator = declarator->declarator;
6110 /* Set the TYPE_CONTEXTs for each tagged type which is local to
6111 the formal parameter list of this FUNCTION_TYPE to point to
6112 the FUNCTION_TYPE node itself. */
6117 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
6118 TYPE_CONTEXT (tag->type) = type;
6124 /* Merge any constancy or volatility into the target type
6126 if ((type_quals & TYPE_QUAL_ATOMIC)
6127 && TREE_CODE (type) == FUNCTION_TYPE)
6130 "%<_Atomic%>-qualified function type");
6131 type_quals &= ~TYPE_QUAL_ATOMIC;
6133 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
6135 pedwarn (loc, OPT_Wpedantic,
6136 "ISO C forbids qualified function types");
6138 type = c_build_qualified_type (type, type_quals);
6139 size_varies = false;
6141 /* When the pointed-to type involves components of variable size,
6142 care must be taken to ensure that the size evaluation code is
6143 emitted early enough to dominate all the possible later uses
6144 and late enough for the variables on which it depends to have
6147 This is expected to happen automatically when the pointed-to
6148 type has a name/declaration of it's own, but special attention
6149 is required if the type is anonymous.
6151 We handle the NORMAL and FIELD contexts here by attaching an
6152 artificial TYPE_DECL to such pointed-to type. This forces the
6153 sizes evaluation at a safe point and ensures it is not deferred
6154 until e.g. within a deeper conditional context.
6156 We expect nothing to be needed here for PARM or TYPENAME.
6157 Pushing a TYPE_DECL at this point for TYPENAME would actually
6158 be incorrect, as we might be in the middle of an expression
6159 with side effects on the pointed-to type size "arguments" prior
6160 to the pointer declaration point and the fake TYPE_DECL in the
6161 enclosing context would force the size evaluation prior to the
6164 if (!TYPE_NAME (type)
6165 && (decl_context == NORMAL || decl_context == FIELD)
6166 && variably_modified_type_p (type, NULL_TREE))
6168 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
6169 DECL_ARTIFICIAL (decl) = 1;
6171 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
6172 TYPE_NAME (type) = decl;
6175 type = c_build_pointer_type (type);
6177 /* Process type qualifiers (such as const or volatile)
6178 that were given inside the `*'. */
6179 type_quals = declarator->u.pointer_quals;
6181 declarator = declarator->declarator;
6188 *decl_attrs = chainon (returned_attrs, *decl_attrs);
6190 /* Now TYPE has the actual type, apart from any qualifiers in
6193 /* Warn about address space used for things other than static memory or
6195 address_space = DECODE_QUAL_ADDR_SPACE (type_quals);
6196 if (!ADDR_SPACE_GENERIC_P (address_space))
6198 if (decl_context == NORMAL)
6200 switch (storage_class)
6203 error ("%qs combined with %<auto%> qualifier for %qE",
6204 c_addr_space_name (address_space), name);
6207 error ("%qs combined with %<register%> qualifier for %qE",
6208 c_addr_space_name (address_space), name);
6211 if (current_function_scope)
6213 error ("%qs specified for auto variable %qE",
6214 c_addr_space_name (address_space), name);
6226 else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE)
6229 error ("%qs specified for parameter %qE",
6230 c_addr_space_name (address_space), name);
6232 error ("%qs specified for unnamed parameter",
6233 c_addr_space_name (address_space));
6235 else if (decl_context == FIELD)
6238 error ("%qs specified for structure field %qE",
6239 c_addr_space_name (address_space), name);
6241 error ("%qs specified for structure field",
6242 c_addr_space_name (address_space));
6246 /* Check the type and width of a bit-field. */
6249 check_bitfield_type_and_width (&type, width, name);
6250 /* C11 makes it implementation-defined (6.7.2.1#5) whether
6251 atomic types are permitted for bit-fields; we have no code to
6252 make bit-field accesses atomic, so disallow them. */
6253 if (type_quals & TYPE_QUAL_ATOMIC)
6256 error ("bit-field %qE has atomic type", name);
6258 error ("bit-field has atomic type");
6259 type_quals &= ~TYPE_QUAL_ATOMIC;
6263 /* Reject invalid uses of _Alignas. */
6264 if (declspecs->alignas_p)
6266 if (storage_class == csc_typedef)
6267 error_at (loc, "alignment specified for typedef %qE", name);
6268 else if (storage_class == csc_register)
6269 error_at (loc, "alignment specified for %<register%> object %qE",
6271 else if (decl_context == PARM)
6274 error_at (loc, "alignment specified for parameter %qE", name);
6276 error_at (loc, "alignment specified for unnamed parameter");
6281 error_at (loc, "alignment specified for bit-field %qE", name);
6283 error_at (loc, "alignment specified for unnamed bit-field");
6285 else if (TREE_CODE (type) == FUNCTION_TYPE)
6286 error_at (loc, "alignment specified for function %qE", name);
6287 else if (declspecs->align_log != -1)
6289 alignas_align = 1U << declspecs->align_log;
6290 if (alignas_align < min_align_of_type (type))
6293 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
6294 "alignment of %qE", name);
6296 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
6297 "alignment of unnamed field");
6303 /* Did array size calculations overflow or does the array cover more
6304 than half of the address-space? */
6305 if (TREE_CODE (type) == ARRAY_TYPE
6306 && COMPLETE_TYPE_P (type)
6307 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
6308 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type)))
6311 error_at (loc, "size of array %qE is too large", name);
6313 error_at (loc, "size of unnamed array is too large");
6314 /* If we proceed with the array type as it is, we'll eventually
6315 crash in tree_to_[su]hwi(). */
6316 type = error_mark_node;
6319 /* If this is declaring a typedef name, return a TYPE_DECL. */
6321 if (storage_class == csc_typedef)
6324 if ((type_quals & TYPE_QUAL_ATOMIC)
6325 && TREE_CODE (type) == FUNCTION_TYPE)
6328 "%<_Atomic%>-qualified function type");
6329 type_quals &= ~TYPE_QUAL_ATOMIC;
6331 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
6333 pedwarn (loc, OPT_Wpedantic,
6334 "ISO C forbids qualified function types");
6336 type = c_build_qualified_type (type, type_quals);
6337 decl = build_decl (declarator->id_loc,
6338 TYPE_DECL, declarator->u.id, type);
6339 if (declspecs->explicit_signed_p)
6340 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
6341 if (declspecs->inline_p)
6342 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
6343 if (declspecs->noreturn_p)
6344 pedwarn (loc, 0,"typedef %q+D declared %<_Noreturn%>", decl);
6346 if (warn_cxx_compat && declarator->u.id != NULL_TREE)
6348 struct c_binding *b = I_TAG_BINDING (declarator->u.id);
6351 && b->decl != NULL_TREE
6352 && (B_IN_CURRENT_SCOPE (b)
6353 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
6354 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
6356 warning_at (declarator->id_loc, OPT_Wc___compat,
6357 ("using %qD as both a typedef and a tag is "
6360 if (b->locus != UNKNOWN_LOCATION)
6361 inform (b->locus, "originally defined here");
6368 /* If this is a type name (such as, in a cast or sizeof),
6369 compute the type and return it now. */
6371 if (decl_context == TYPENAME)
6373 /* Note that the grammar rejects storage classes in typenames
6375 gcc_assert (storage_class == csc_none && !threadp
6376 && !declspecs->inline_p && !declspecs->noreturn_p);
6377 if ((type_quals & TYPE_QUAL_ATOMIC)
6378 && TREE_CODE (type) == FUNCTION_TYPE)
6381 "%<_Atomic%>-qualified function type");
6382 type_quals &= ~TYPE_QUAL_ATOMIC;
6384 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
6386 pedwarn (loc, OPT_Wpedantic,
6387 "ISO C forbids const or volatile function types");
6389 type = c_build_qualified_type (type, type_quals);
6393 if (pedantic && decl_context == FIELD
6394 && variably_modified_type_p (type, NULL_TREE))
6397 pedwarn (loc, OPT_Wpedantic, "a member of a structure or union cannot "
6398 "have a variably modified type");
6401 /* Aside from typedefs and type names (handle above),
6402 `void' at top level (not within pointer)
6403 is allowed only in public variables.
6404 We don't complain about parms either, but that is because
6405 a better error message can be made later. */
6407 if (VOID_TYPE_P (type) && decl_context != PARM
6408 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
6409 && (storage_class == csc_extern
6410 || (current_scope == file_scope
6411 && !(storage_class == csc_static
6412 || storage_class == csc_register)))))
6414 error_at (loc, "variable or field %qE declared void", name);
6415 type = integer_type_node;
6418 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6419 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6424 if (decl_context == PARM)
6427 bool array_parameter_p = false;
6429 /* A parameter declared as an array of T is really a pointer to T.
6430 One declared as a function is really a pointer to a function. */
6432 if (TREE_CODE (type) == ARRAY_TYPE)
6434 /* Transfer const-ness of array into that of type pointed to. */
6435 type = TREE_TYPE (type);
6437 type = c_build_qualified_type (type, type_quals);
6438 type = c_build_pointer_type (type);
6439 type_quals = array_ptr_quals;
6441 type = c_build_qualified_type (type, type_quals);
6443 /* We don't yet implement attributes in this context. */
6444 if (array_ptr_attrs != NULL_TREE)
6445 warning_at (loc, OPT_Wattributes,
6446 "attributes in parameter array declarator ignored");
6448 size_varies = false;
6449 array_parameter_p = true;
6451 else if (TREE_CODE (type) == FUNCTION_TYPE)
6453 if (type_quals & TYPE_QUAL_ATOMIC)
6456 "%<_Atomic%>-qualified function type");
6457 type_quals &= ~TYPE_QUAL_ATOMIC;
6459 else if (type_quals)
6460 pedwarn (loc, OPT_Wpedantic,
6461 "ISO C forbids qualified function types");
6463 type = c_build_qualified_type (type, type_quals);
6464 type = c_build_pointer_type (type);
6465 type_quals = TYPE_UNQUALIFIED;
6467 else if (type_quals)
6468 type = c_build_qualified_type (type, type_quals);
6470 decl = build_decl (declarator->id_loc,
6471 PARM_DECL, declarator->u.id, type);
6473 C_DECL_VARIABLE_SIZE (decl) = 1;
6474 C_ARRAY_PARAMETER (decl) = array_parameter_p;
6476 /* Compute the type actually passed in the parmlist,
6477 for the case where there is no prototype.
6478 (For example, shorts and chars are passed as ints.)
6479 When there is a prototype, this is overridden later. */
6481 if (type == error_mark_node)
6482 promoted_type = type;
6484 promoted_type = c_type_promotes_to (type);
6486 DECL_ARG_TYPE (decl) = promoted_type;
6487 if (declspecs->inline_p)
6488 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
6489 if (declspecs->noreturn_p)
6490 pedwarn (loc, 0, "parameter %q+D declared %<_Noreturn%>", decl);
6492 else if (decl_context == FIELD)
6494 /* Note that the grammar rejects storage classes in typenames
6496 gcc_assert (storage_class == csc_none && !threadp
6497 && !declspecs->inline_p && !declspecs->noreturn_p);
6499 /* Structure field. It may not be a function. */
6501 if (TREE_CODE (type) == FUNCTION_TYPE)
6503 error_at (loc, "field %qE declared as a function", name);
6504 type = build_pointer_type (type);
6506 else if (TREE_CODE (type) != ERROR_MARK
6507 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
6510 error_at (loc, "field %qE has incomplete type", name);
6512 error_at (loc, "unnamed field has incomplete type");
6513 type = error_mark_node;
6515 else if (TREE_CODE (type) == ARRAY_TYPE
6516 && TYPE_DOMAIN (type) == NULL_TREE)
6518 /* We have a flexible array member through a typedef.
6519 Set suitable range. Whether this is a correct position
6520 for a flexible array member will be determined elsewhere. */
6521 if (!in_system_header_at (input_location))
6522 pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not "
6523 "support flexible array members");
6524 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
6525 TYPE_DOMAIN (type) = build_range_type (sizetype, size_zero_node,
6528 type = c_build_qualified_type (type, type_quals);
6529 decl = build_decl (declarator->id_loc,
6530 FIELD_DECL, declarator->u.id, type);
6531 DECL_NONADDRESSABLE_P (decl) = bitfield;
6532 if (bitfield && !declarator->u.id)
6533 TREE_NO_WARNING (decl) = 1;
6536 C_DECL_VARIABLE_SIZE (decl) = 1;
6538 else if (TREE_CODE (type) == FUNCTION_TYPE)
6540 if (storage_class == csc_register || threadp)
6542 error_at (loc, "invalid storage class for function %qE", name);
6544 else if (current_scope != file_scope)
6546 /* Function declaration not at file scope. Storage
6547 classes other than `extern' are not allowed, C99
6548 6.7.1p5, and `extern' makes no difference. However,
6549 GCC allows 'auto', perhaps with 'inline', to support
6550 nested functions. */
6551 if (storage_class == csc_auto)
6552 pedwarn (loc, OPT_Wpedantic,
6553 "invalid storage class for function %qE", name);
6554 else if (storage_class == csc_static)
6556 error_at (loc, "invalid storage class for function %qE", name);
6558 storage_class = declspecs->storage_class = csc_none;
6564 decl = build_decl (declarator->id_loc,
6565 FUNCTION_DECL, declarator->u.id, type);
6566 decl = build_decl_attribute_variant (decl, decl_attr);
6568 if (type_quals & TYPE_QUAL_ATOMIC)
6571 "%<_Atomic%>-qualified function type");
6572 type_quals &= ~TYPE_QUAL_ATOMIC;
6574 else if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
6575 pedwarn (loc, OPT_Wpedantic,
6576 "ISO C forbids qualified function types");
6578 /* Every function declaration is an external reference
6579 (DECL_EXTERNAL) except for those which are not at file
6580 scope and are explicitly declared "auto". This is
6581 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6582 GCC to signify a forward declaration of a nested function. */
6583 if (storage_class == csc_auto && current_scope != file_scope)
6584 DECL_EXTERNAL (decl) = 0;
6585 /* In C99, a function which is declared 'inline' with 'extern'
6586 is not an external reference (which is confusing). It
6587 means that the later definition of the function must be output
6588 in this file, C99 6.7.4p6. In GNU C89, a function declared
6589 'extern inline' is an external reference. */
6590 else if (declspecs->inline_p && storage_class != csc_static)
6591 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
6592 == flag_gnu89_inline);
6594 DECL_EXTERNAL (decl) = !initialized;
6596 /* Record absence of global scope for `static' or `auto'. */
6598 = !(storage_class == csc_static || storage_class == csc_auto);
6600 /* For a function definition, record the argument information
6601 block where store_parm_decls will look for it. */
6603 current_function_arg_info = arg_info;
6605 if (declspecs->default_int_p)
6606 C_FUNCTION_IMPLICIT_INT (decl) = 1;
6608 /* Record presence of `inline' and `_Noreturn', if it is
6610 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
6612 if (declspecs->inline_p)
6613 pedwarn (loc, 0, "cannot inline function %<main%>");
6614 if (declspecs->noreturn_p)
6615 pedwarn (loc, 0, "%<main%> declared %<_Noreturn%>");
6619 if (declspecs->inline_p)
6620 /* Record that the function is declared `inline'. */
6621 DECL_DECLARED_INLINE_P (decl) = 1;
6622 if (declspecs->noreturn_p)
6625 pedwarn_c99 (loc, OPT_Wpedantic,
6626 "ISO C99 does not support %<_Noreturn%>");
6628 pedwarn_c99 (loc, OPT_Wpedantic,
6629 "ISO C90 does not support %<_Noreturn%>");
6630 TREE_THIS_VOLATILE (decl) = 1;
6636 /* It's a variable. */
6637 /* An uninitialized decl with `extern' is a reference. */
6638 int extern_ref = !initialized && storage_class == csc_extern;
6640 type = c_build_qualified_type (type, type_quals);
6642 /* C99 6.2.2p7: It is invalid (compile-time undefined
6643 behavior) to create an 'extern' declaration for a
6644 variable if there is a global declaration that is
6645 'static' and the global declaration is not visible.
6646 (If the static declaration _is_ currently visible,
6647 the 'extern' declaration is taken to refer to that decl.) */
6648 if (extern_ref && current_scope != file_scope)
6650 tree global_decl = identifier_global_value (declarator->u.id);
6651 tree visible_decl = lookup_name (declarator->u.id);
6654 && global_decl != visible_decl
6655 && TREE_CODE (global_decl) == VAR_DECL
6656 && !TREE_PUBLIC (global_decl))
6657 error_at (loc, "variable previously declared %<static%> "
6658 "redeclared %<extern%>");
6661 decl = build_decl (declarator->id_loc,
6662 VAR_DECL, declarator->u.id, type);
6664 C_DECL_VARIABLE_SIZE (decl) = 1;
6666 if (declspecs->inline_p)
6667 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
6668 if (declspecs->noreturn_p)
6669 pedwarn (loc, 0, "variable %q+D declared %<_Noreturn%>", decl);
6671 /* At file scope, an initialized extern declaration may follow
6672 a static declaration. In that case, DECL_EXTERNAL will be
6673 reset later in start_decl. */
6674 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
6676 /* At file scope, the presence of a `static' or `register' storage
6677 class specifier, or the absence of all storage class specifiers
6678 makes this declaration a definition (perhaps tentative). Also,
6679 the absence of `static' makes it public. */
6680 if (current_scope == file_scope)
6682 TREE_PUBLIC (decl) = storage_class != csc_static;
6683 TREE_STATIC (decl) = !extern_ref;
6685 /* Not at file scope, only `static' makes a static definition. */
6688 TREE_STATIC (decl) = (storage_class == csc_static);
6689 TREE_PUBLIC (decl) = extern_ref;
6693 set_decl_tls_model (decl, decl_default_tls_model (decl));
6696 if ((storage_class == csc_extern
6697 || (storage_class == csc_none
6698 && TREE_CODE (type) == FUNCTION_TYPE
6700 && variably_modified_type_p (type, NULL_TREE))
6703 if (TREE_CODE (type) == FUNCTION_TYPE)
6704 error_at (loc, "non-nested function with variably modified type");
6706 error_at (loc, "object with variably modified type must have "
6710 /* Record `register' declaration for warnings on &
6711 and in case doing stupid register allocation. */
6713 if (storage_class == csc_register)
6715 C_DECL_REGISTER (decl) = 1;
6716 DECL_REGISTER (decl) = 1;
6719 /* Record constancy and volatility. */
6720 c_apply_type_quals_to_decl (type_quals, decl);
6722 /* Apply _Alignas specifiers. */
6725 DECL_ALIGN (decl) = alignas_align * BITS_PER_UNIT;
6726 DECL_USER_ALIGN (decl) = 1;
6729 /* If a type has volatile components, it should be stored in memory.
6730 Otherwise, the fact that those components are volatile
6731 will be ignored, and would even crash the compiler.
6732 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6733 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
6734 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
6735 || TREE_CODE (decl) == RESULT_DECL))
6737 /* It is not an error for a structure with volatile fields to
6738 be declared register, but reset DECL_REGISTER since it
6739 cannot actually go in a register. */
6740 int was_reg = C_DECL_REGISTER (decl);
6741 C_DECL_REGISTER (decl) = 0;
6742 DECL_REGISTER (decl) = 0;
6743 c_mark_addressable (decl);
6744 C_DECL_REGISTER (decl) = was_reg;
6747 /* This is the earliest point at which we might know the assembler
6748 name of a variable. Thus, if it's known before this, die horribly. */
6749 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
6752 && TREE_CODE (decl) == VAR_DECL
6753 && TREE_PUBLIC (decl)
6754 && TREE_STATIC (decl)
6755 && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
6756 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
6757 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
6758 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
6759 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
6760 ("non-local variable %qD with anonymous type is "
6761 "questionable in C++"),
6768 /* Decode the parameter-list info for a function type or function definition.
6769 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6770 if there is an identifier list instead of a parameter decl list).
6771 These two functions are separate because when a function returns
6772 or receives functions then each is called multiple times but the order
6773 of calls is different. The last call to `grokparms' is always the one
6774 that contains the formal parameter names of a function definition.
6776 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6778 FUNCDEF_FLAG is true for a function definition, false for
6779 a mere declaration. A nonempty identifier-list gets an error message
6780 when FUNCDEF_FLAG is false. */
6783 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
6785 tree arg_types = arg_info->types;
6787 if (funcdef_flag && arg_info->had_vla_unspec)
6789 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6791 error ("%<[*]%> not allowed in other than function prototype scope");
6794 if (arg_types == 0 && !funcdef_flag
6795 && !in_system_header_at (input_location))
6796 warning (OPT_Wstrict_prototypes,
6797 "function declaration isn%'t a prototype");
6799 if (arg_types == error_mark_node)
6800 return 0; /* don't set TYPE_ARG_TYPES in this case */
6802 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
6806 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
6807 arg_info->parms = NULL_TREE;
6810 arg_info->parms = arg_info->types;
6812 arg_info->types = 0;
6817 tree parm, type, typelt;
6818 unsigned int parmno;
6821 /* If there is a parameter of incomplete type in a definition,
6822 this is an error. In a declaration this is valid, and a
6823 struct or union type may be completed later, before any calls
6824 or definition of the function. In the case where the tag was
6825 first declared within the parameter list, a warning has
6826 already been given. If a parameter has void type, then
6827 however the function cannot be defined or called, so
6830 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
6832 parm = DECL_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
6834 type = TREE_VALUE (typelt);
6835 if (type == error_mark_node)
6838 if (!COMPLETE_TYPE_P (type))
6842 if (DECL_NAME (parm))
6843 error_at (input_location,
6844 "parameter %u (%q+D) has incomplete type",
6847 error_at (DECL_SOURCE_LOCATION (parm),
6848 "parameter %u has incomplete type",
6851 TREE_VALUE (typelt) = error_mark_node;
6852 TREE_TYPE (parm) = error_mark_node;
6853 arg_types = NULL_TREE;
6855 else if (VOID_TYPE_P (type))
6857 if (DECL_NAME (parm))
6858 warning_at (input_location, 0,
6859 "parameter %u (%q+D) has void type",
6862 warning_at (DECL_SOURCE_LOCATION (parm), 0,
6863 "parameter %u has void type",
6868 errmsg = targetm.invalid_parameter_type (type);
6872 TREE_VALUE (typelt) = error_mark_node;
6873 TREE_TYPE (parm) = error_mark_node;
6874 arg_types = NULL_TREE;
6877 if (DECL_NAME (parm) && TREE_USED (parm))
6878 warn_if_shadowing (parm);
6884 /* Allocate and initialize a c_arg_info structure from the parser's
6888 build_arg_info (void)
6890 struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info);
6891 ret->parms = NULL_TREE;
6893 ret->types = NULL_TREE;
6894 ret->others = NULL_TREE;
6895 ret->pending_sizes = NULL;
6896 ret->had_vla_unspec = 0;
6900 /* Take apart the current scope and return a c_arg_info structure with
6901 info on a parameter list just parsed.
6903 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6905 ELLIPSIS being true means the argument list ended in '...' so don't
6906 append a sentinel (void_list_node) to the end of the type-list.
6908 EXPR is NULL or an expression that needs to be evaluated for the
6909 side effects of array size expressions in the parameters. */
6912 get_parm_info (bool ellipsis, tree expr)
6914 struct c_binding *b = current_scope->bindings;
6915 struct c_arg_info *arg_info = build_arg_info ();
6918 vec<c_arg_tag, va_gc> *tags = NULL;
6922 static bool explained_incomplete_types = false;
6923 bool gave_void_only_once_err = false;
6925 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
6927 /* The bindings in this scope must not get put into a block.
6928 We will take care of deleting the binding nodes. */
6929 current_scope->bindings = 0;
6931 /* This function is only called if there was *something* on the
6935 /* A parameter list consisting solely of 'void' indicates that the
6936 function takes no arguments. But if the 'void' is qualified
6937 (by 'const' or 'volatile'), or has a storage class specifier
6938 ('register'), then the behavior is undefined; issue an error.
6939 Typedefs for 'void' are OK (see DR#157). */
6940 if (b->prev == 0 /* one binding */
6941 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
6942 && !DECL_NAME (b->decl) /* anonymous */
6943 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
6945 if (TYPE_QUALS (TREE_TYPE (b->decl)) != TYPE_UNQUALIFIED
6946 || C_DECL_REGISTER (b->decl))
6947 error ("%<void%> as only parameter may not be qualified");
6949 /* There cannot be an ellipsis. */
6951 error ("%<void%> must be the only parameter");
6953 arg_info->types = void_list_node;
6958 types = void_list_node;
6960 /* Break up the bindings list into parms, tags, types, and others;
6961 apply sanity checks; purge the name-to-decl bindings. */
6964 tree decl = b->decl;
6965 tree type = TREE_TYPE (decl);
6967 const char *keyword;
6969 switch (TREE_CODE (decl))
6974 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6975 I_SYMBOL_BINDING (b->id) = b->shadowed;
6978 /* Check for forward decls that never got their actual decl. */
6979 if (TREE_ASM_WRITTEN (decl))
6980 error ("parameter %q+D has just a forward declaration", decl);
6981 /* Check for (..., void, ...) and issue an error. */
6982 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
6984 if (!gave_void_only_once_err)
6986 error ("%<void%> must be the only parameter");
6987 gave_void_only_once_err = true;
6992 /* Valid parameter, add it to the list. */
6993 DECL_CHAIN (decl) = parms;
6996 /* Since there is a prototype, args are passed in their
6997 declared types. The back end may override this later. */
6998 DECL_ARG_TYPE (decl) = type;
6999 types = tree_cons (0, type, types);
7003 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
7004 case UNION_TYPE: keyword = "union"; goto tag;
7005 case RECORD_TYPE: keyword = "struct"; goto tag;
7007 /* Types may not have tag-names, in which case the type
7008 appears in the bindings list with b->id NULL. */
7011 gcc_assert (I_TAG_BINDING (b->id) == b);
7012 I_TAG_BINDING (b->id) = b->shadowed;
7015 /* Warn about any struct, union or enum tags defined in a
7016 parameter list. The scope of such types is limited to
7017 the parameter list, which is rarely if ever desirable
7018 (it's impossible to call such a function with type-
7019 correct arguments). An anonymous union parm type is
7020 meaningful as a GNU extension, so don't warn for that. */
7021 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
7024 /* The %s will be one of 'struct', 'union', or 'enum'. */
7025 warning (0, "%<%s %E%> declared inside parameter list",
7028 /* The %s will be one of 'struct', 'union', or 'enum'. */
7029 warning (0, "anonymous %s declared inside parameter list",
7032 if (!explained_incomplete_types)
7034 warning (0, "its scope is only this definition or declaration,"
7035 " which is probably not what you want");
7036 explained_incomplete_types = true;
7042 vec_safe_push (tags, tag);
7048 /* CONST_DECLs appear here when we have an embedded enum,
7049 and TYPE_DECLs appear here when we have an embedded struct
7050 or union. No warnings for this - we already warned about the
7051 type itself. FUNCTION_DECLs appear when there is an implicit
7052 function declaration in the parameter list. */
7054 /* When we reinsert this decl in the function body, we need
7055 to reconstruct whether it was marked as nested. */
7056 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7059 DECL_CHAIN (decl) = others;
7064 /* error_mark_node appears here when we have an undeclared
7065 variable. Just throw it away. */
7068 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
7069 I_SYMBOL_BINDING (b->id) = b->shadowed;
7073 /* Other things that might be encountered. */
7080 b = free_binding_and_advance (b);
7083 arg_info->parms = parms;
7084 arg_info->tags = tags;
7085 arg_info->types = types;
7086 arg_info->others = others;
7087 arg_info->pending_sizes = expr;
7091 /* Get the struct, enum or union (CODE says which) with tag NAME.
7092 Define the tag as a forward-reference with location LOC if it is
7093 not defined. Return a c_typespec structure for the type
7097 parser_xref_tag (location_t loc, enum tree_code code, tree name)
7099 struct c_typespec ret;
7103 ret.expr = NULL_TREE;
7104 ret.expr_const_operands = true;
7106 /* If a cross reference is requested, look up the type
7107 already defined for this tag and return it. */
7109 ref = lookup_tag (code, name, 0, &refloc);
7110 /* If this is the right type of tag, return what we found.
7111 (This reference will be shadowed by shadow_tag later if appropriate.)
7112 If this is the wrong type of tag, do not return it. If it was the
7113 wrong type in the same scope, we will have had an error
7114 message already; if in a different scope and declaring
7115 a name, pending_xref_error will give an error message; but if in a
7116 different scope and not declaring a name, this tag should
7117 shadow the previous declaration of a different type of tag, and
7118 this would not work properly if we return the reference found.
7119 (For example, with "struct foo" in an outer scope, "union foo;"
7120 must shadow that tag with a new one of union type.) */
7121 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
7122 if (ref && TREE_CODE (ref) == code)
7124 if (C_TYPE_DEFINED_IN_STRUCT (ref)
7125 && loc != UNKNOWN_LOCATION
7131 warning_at (loc, OPT_Wc___compat,
7132 ("enum type defined in struct or union "
7133 "is not visible in C++"));
7134 inform (refloc, "enum type defined here");
7137 warning_at (loc, OPT_Wc___compat,
7138 ("struct defined in struct or union "
7139 "is not visible in C++"));
7140 inform (refloc, "struct defined here");
7143 warning_at (loc, OPT_Wc___compat,
7144 ("union defined in struct or union "
7145 "is not visible in C++"));
7146 inform (refloc, "union defined here");
7157 /* If no such tag is yet defined, create a forward-reference node
7158 and record it as the "definition".
7159 When a real declaration of this type is found,
7160 the forward-reference will be altered into a real type. */
7162 ref = make_node (code);
7163 if (code == ENUMERAL_TYPE)
7165 /* Give the type a default layout like unsigned int
7166 to avoid crashing if it does not get defined. */
7167 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
7168 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
7169 TYPE_USER_ALIGN (ref) = 0;
7170 TYPE_UNSIGNED (ref) = 1;
7171 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
7172 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
7173 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
7176 pushtag (loc, name, ref);
7182 /* Get the struct, enum or union (CODE says which) with tag NAME.
7183 Define the tag as a forward-reference if it is not defined.
7184 Return a tree for the type. */
7187 xref_tag (enum tree_code code, tree name)
7189 return parser_xref_tag (input_location, code, name).spec;
7192 /* Make sure that the tag NAME is defined *in the current scope*
7193 at least as a forward reference.
7194 LOC is the location of the struct's definition.
7195 CODE says which kind of tag NAME ought to be.
7197 This stores the current value of the file static STRUCT_PARSE_INFO
7198 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
7199 new c_struct_parse_info structure. The old value of
7200 STRUCT_PARSE_INFO is restored in finish_struct. */
7203 start_struct (location_t loc, enum tree_code code, tree name,
7204 struct c_struct_parse_info **enclosing_struct_parse_info)
7206 /* If there is already a tag defined at this scope
7207 (as a forward reference), just return it. */
7209 tree ref = NULL_TREE;
7210 location_t refloc = UNKNOWN_LOCATION;
7212 if (name != NULL_TREE)
7213 ref = lookup_tag (code, name, 1, &refloc);
7214 if (ref && TREE_CODE (ref) == code)
7216 if (TYPE_SIZE (ref))
7218 if (code == UNION_TYPE)
7219 error_at (loc, "redefinition of %<union %E%>", name);
7221 error_at (loc, "redefinition of %<struct %E%>", name);
7222 if (refloc != UNKNOWN_LOCATION)
7223 inform (refloc, "originally defined here");
7224 /* Don't create structures using a name already in use. */
7227 else if (C_TYPE_BEING_DEFINED (ref))
7229 if (code == UNION_TYPE)
7230 error_at (loc, "nested redefinition of %<union %E%>", name);
7232 error_at (loc, "nested redefinition of %<struct %E%>", name);
7233 /* Don't bother to report "originally defined here" for a
7234 nested redefinition; the original definition should be
7236 /* Don't create structures that contain themselves. */
7241 /* Otherwise create a forward-reference just so the tag is in scope. */
7243 if (ref == NULL_TREE || TREE_CODE (ref) != code)
7245 ref = make_node (code);
7246 pushtag (loc, name, ref);
7249 C_TYPE_BEING_DEFINED (ref) = 1;
7250 TYPE_PACKED (ref) = flag_pack_struct;
7252 *enclosing_struct_parse_info = struct_parse_info;
7253 struct_parse_info = XNEW (struct c_struct_parse_info);
7254 struct_parse_info->struct_types.create (0);
7255 struct_parse_info->fields.create (0);
7256 struct_parse_info->typedefs_seen.create (0);
7258 /* FIXME: This will issue a warning for a use of a type defined
7259 within a statement expr used within sizeof, et. al. This is not
7260 terribly serious as C++ doesn't permit statement exprs within
7262 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7263 warning_at (loc, OPT_Wc___compat,
7264 "defining type in %qs expression is invalid in C++",
7267 : (in_typeof ? "typeof" : "alignof")));
7272 /* Process the specs, declarator and width (NULL if omitted)
7273 of a structure component, returning a FIELD_DECL node.
7274 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
7275 DECL_ATTRS is as for grokdeclarator.
7277 LOC is the location of the structure component.
7279 This is done during the parsing of the struct declaration.
7280 The FIELD_DECL nodes are chained together and the lot of them
7281 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
7284 grokfield (location_t loc,
7285 struct c_declarator *declarator, struct c_declspecs *declspecs,
7286 tree width, tree *decl_attrs)
7290 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
7291 && width == NULL_TREE)
7293 /* This is an unnamed decl.
7295 If we have something of the form "union { list } ;" then this
7296 is the anonymous union extension. Similarly for struct.
7298 If this is something of the form "struct foo;", then
7299 If MS or Plan 9 extensions are enabled, this is handled as
7300 an anonymous struct.
7301 Otherwise this is a forward declaration of a structure tag.
7303 If this is something of the form "foo;" and foo is a TYPE_DECL, then
7304 If foo names a structure or union without a tag, then this
7305 is an anonymous struct (this is permitted by C11).
7306 If MS or Plan 9 extensions are enabled and foo names a
7307 structure, then again this is an anonymous struct.
7308 Otherwise this is an error.
7310 Oh what a horrid tangled web we weave. I wonder if MS consciously
7311 took this from Plan 9 or if it was an accident of implementation
7312 that took root before someone noticed the bug... */
7314 tree type = declspecs->type;
7315 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
7316 || TREE_CODE (type) == UNION_TYPE);
7320 && (flag_ms_extensions
7321 || flag_plan9_extensions
7322 || !declspecs->typedef_p))
7324 if (flag_ms_extensions || flag_plan9_extensions)
7326 else if (TYPE_NAME (type) == NULL)
7333 pedwarn (loc, 0, "declaration does not declare anything");
7337 pedwarn_c99 (loc, OPT_Wpedantic,
7338 "ISO C99 doesn%'t support unnamed structs/unions");
7340 pedwarn_c99 (loc, OPT_Wpedantic,
7341 "ISO C90 doesn%'t support unnamed structs/unions");
7344 value = grokdeclarator (declarator, declspecs, FIELD, false,
7345 width ? &width : NULL, decl_attrs, NULL, NULL,
7348 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
7349 DECL_INITIAL (value) = width;
7351 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
7353 /* If we currently have a binding for this field, set the
7354 in_struct field in the binding, so that we warn about lookups
7356 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
7359 /* If the in_struct field is not yet set, push it on a list
7360 to be cleared when this struct is finished. */
7363 struct_parse_info->fields.safe_push (b);
7372 /* Subroutine of detect_field_duplicates: return whether X and Y,
7373 which are both fields in the same struct, have duplicate field
7377 is_duplicate_field (tree x, tree y)
7379 if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y))
7382 /* When using -fplan9-extensions, an anonymous field whose name is a
7383 typedef can duplicate a field name. */
7384 if (flag_plan9_extensions
7385 && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE))
7387 tree xt, xn, yt, yn;
7390 if (DECL_NAME (x) != NULL_TREE)
7392 else if ((TREE_CODE (xt) == RECORD_TYPE || TREE_CODE (xt) == UNION_TYPE)
7393 && TYPE_NAME (xt) != NULL_TREE
7394 && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL)
7395 xn = DECL_NAME (TYPE_NAME (xt));
7400 if (DECL_NAME (y) != NULL_TREE)
7402 else if ((TREE_CODE (yt) == RECORD_TYPE || TREE_CODE (yt) == UNION_TYPE)
7403 && TYPE_NAME (yt) != NULL_TREE
7404 && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL)
7405 yn = DECL_NAME (TYPE_NAME (yt));
7409 if (xn != NULL_TREE && xn == yn)
7416 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7417 to HTAB, giving errors for any duplicates. */
7420 detect_field_duplicates_hash (tree fieldlist,
7421 hash_table<pointer_hash <tree_node> > *htab)
7426 for (x = fieldlist; x ; x = DECL_CHAIN (x))
7427 if ((y = DECL_NAME (x)) != 0)
7429 slot = htab->find_slot (y, INSERT);
7432 error ("duplicate member %q+D", x);
7433 DECL_NAME (x) = NULL_TREE;
7437 else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7438 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7440 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab);
7442 /* When using -fplan9-extensions, an anonymous field whose
7443 name is a typedef can duplicate a field name. */
7444 if (flag_plan9_extensions
7445 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
7446 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)
7448 tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x)));
7449 slot = htab->find_slot (xn, INSERT);
7451 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x)));
7457 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7458 the list such that this does not present a problem later. */
7461 detect_field_duplicates (tree fieldlist)
7466 /* If the struct is the list of instance variables of an Objective-C
7467 class, then we need to check all the instance variables of
7468 superclasses when checking for duplicates (since you can't have
7469 an instance variable in a subclass with the same name as an
7470 instance variable in a superclass). We pass on this job to the
7471 Objective-C compiler. objc_detect_field_duplicates() will return
7472 false if we are not checking the list of instance variables and
7473 the C frontend should proceed with the standard field duplicate
7474 checks. If we are checking the list of instance variables, the
7475 ObjC frontend will do the check, emit the errors if needed, and
7476 then return true. */
7477 if (c_dialect_objc ())
7478 if (objc_detect_field_duplicates (false))
7481 /* First, see if there are more than "a few" fields.
7482 This is trivially true if there are zero or one fields. */
7483 if (!fieldlist || !DECL_CHAIN (fieldlist))
7488 if (DECL_NAME (x) == NULL_TREE
7489 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7490 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7493 } while (timeout > 0 && x);
7495 /* If there were "few" fields and no anonymous structures or unions,
7496 avoid the overhead of allocating a hash table. Instead just do
7497 the nested traversal thing. */
7500 for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x))
7501 /* When using -fplan9-extensions, we can have duplicates
7502 between typedef names and fields. */
7504 || (flag_plan9_extensions
7505 && DECL_NAME (x) == NULL_TREE
7506 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7507 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7508 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
7509 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL))
7511 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
7512 if (is_duplicate_field (y, x))
7514 error ("duplicate member %q+D", x);
7515 DECL_NAME (x) = NULL_TREE;
7521 hash_table<pointer_hash <tree_node> > htab (37);
7522 detect_field_duplicates_hash (fieldlist, &htab);
7526 /* Finish up struct info used by -Wc++-compat. */
7529 warn_cxx_compat_finish_struct (tree fieldlist)
7533 struct c_binding *b;
7535 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7536 the current struct. We do this now at the end of the struct
7537 because the flag is used to issue visibility warnings, and we
7538 only want to issue those warnings if the type is referenced
7539 outside of the struct declaration. */
7540 FOR_EACH_VEC_ELT (struct_parse_info->struct_types, ix, x)
7541 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
7543 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7544 typedefs used when declaring fields in this struct. If the name
7545 of any of the fields is also a typedef name then the struct would
7546 not parse in C++, because the C++ lookup rules say that the
7547 typedef name would be looked up in the context of the struct, and
7548 would thus be the field rather than the typedef. */
7549 if (!struct_parse_info->typedefs_seen.is_empty ()
7550 && fieldlist != NULL_TREE)
7552 /* Use a hash_set<tree> using the name of the typedef. We can use
7553 a hash_set<tree> because identifiers are interned. */
7554 hash_set<tree> tset;
7556 FOR_EACH_VEC_ELT (struct_parse_info->typedefs_seen, ix, x)
7557 tset.add (DECL_NAME (x));
7559 for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x))
7561 if (DECL_NAME (x) != NULL_TREE
7562 && tset.contains (DECL_NAME (x)))
7564 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
7565 ("using %qD as both field and typedef name is "
7568 /* FIXME: It would be nice to report the location where
7569 the typedef name is used. */
7574 /* For each field which has a binding and which was not defined in
7575 an enclosing struct, clear the in_struct field. */
7576 FOR_EACH_VEC_ELT (struct_parse_info->fields, ix, b)
7580 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7581 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7582 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7583 ATTRIBUTES are attributes to be applied to the structure.
7585 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7586 the struct was started. */
7589 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
7590 struct c_struct_parse_info *enclosing_struct_parse_info)
7593 bool toplevel = file_scope == current_scope;
7594 int saw_named_field;
7596 /* If this type was previously laid out as a forward reference,
7597 make sure we lay it out again. */
7601 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7605 for (x = fieldlist; x; x = DECL_CHAIN (x))
7607 if (DECL_NAME (x) != 0)
7610 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7611 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7617 if (TREE_CODE (t) == UNION_TYPE)
7620 pedwarn (loc, OPT_Wpedantic, "union has no named members");
7622 pedwarn (loc, OPT_Wpedantic, "union has no members");
7627 pedwarn (loc, OPT_Wpedantic, "struct has no named members");
7629 pedwarn (loc, OPT_Wpedantic, "struct has no members");
7634 /* Install struct as DECL_CONTEXT of each field decl.
7635 Also process specified field sizes, found in the DECL_INITIAL,
7636 storing 0 there after the type has been changed to precision equal
7637 to its width, rather than the precision of the specified standard
7638 type. (Correct layout requires the original type to have been preserved
7641 saw_named_field = 0;
7642 for (x = fieldlist; x; x = DECL_CHAIN (x))
7644 if (TREE_TYPE (x) == error_mark_node)
7647 DECL_CONTEXT (x) = t;
7649 /* If any field is const, the structure type is pseudo-const. */
7650 if (TREE_READONLY (x))
7651 C_TYPE_FIELDS_READONLY (t) = 1;
7654 /* A field that is pseudo-const makes the structure likewise. */
7655 tree t1 = strip_array_types (TREE_TYPE (x));
7656 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
7657 && C_TYPE_FIELDS_READONLY (t1))
7658 C_TYPE_FIELDS_READONLY (t) = 1;
7661 /* Any field that is volatile means variables of this type must be
7662 treated in some ways as volatile. */
7663 if (TREE_THIS_VOLATILE (x))
7664 C_TYPE_FIELDS_VOLATILE (t) = 1;
7666 /* Any field of nominal variable size implies structure is too. */
7667 if (C_DECL_VARIABLE_SIZE (x))
7668 C_TYPE_VARIABLE_SIZE (t) = 1;
7670 if (DECL_INITIAL (x))
7672 unsigned HOST_WIDE_INT width = tree_to_uhwi (DECL_INITIAL (x));
7673 DECL_SIZE (x) = bitsize_int (width);
7674 DECL_BIT_FIELD (x) = 1;
7675 SET_DECL_C_BIT_FIELD (x);
7679 && (DECL_BIT_FIELD (x)
7680 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
7681 DECL_PACKED (x) = 1;
7683 /* Detect flexible array member in an invalid context. */
7684 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
7685 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
7686 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
7687 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
7689 if (TREE_CODE (t) == UNION_TYPE)
7691 error_at (DECL_SOURCE_LOCATION (x),
7692 "flexible array member in union");
7693 TREE_TYPE (x) = error_mark_node;
7695 else if (DECL_CHAIN (x) != NULL_TREE)
7697 error_at (DECL_SOURCE_LOCATION (x),
7698 "flexible array member not at end of struct");
7699 TREE_TYPE (x) = error_mark_node;
7701 else if (!saw_named_field)
7703 error_at (DECL_SOURCE_LOCATION (x),
7704 "flexible array member in otherwise empty struct");
7705 TREE_TYPE (x) = error_mark_node;
7709 if (pedantic && TREE_CODE (t) == RECORD_TYPE
7710 && flexible_array_type_p (TREE_TYPE (x)))
7711 pedwarn (DECL_SOURCE_LOCATION (x), OPT_Wpedantic,
7712 "invalid use of structure with flexible array member");
7715 || TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7716 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7717 saw_named_field = 1;
7720 detect_field_duplicates (fieldlist);
7722 /* Now we have the nearly final fieldlist. Record it,
7723 then lay out the structure or union (including the fields). */
7725 TYPE_FIELDS (t) = fieldlist;
7729 if (TYPE_SIZE_UNIT (t)
7730 && TREE_CODE (TYPE_SIZE_UNIT (t)) == INTEGER_CST
7731 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t))
7732 && !valid_constant_size_p (TYPE_SIZE_UNIT (t)))
7733 error ("type %qT is too large", t);
7735 /* Give bit-fields their proper types. */
7737 tree *fieldlistp = &fieldlist;
7739 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
7740 && TREE_TYPE (*fieldlistp) != error_mark_node)
7742 unsigned HOST_WIDE_INT width
7743 = tree_to_uhwi (DECL_INITIAL (*fieldlistp));
7744 tree type = TREE_TYPE (*fieldlistp);
7745 if (width != TYPE_PRECISION (type))
7747 TREE_TYPE (*fieldlistp)
7748 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
7749 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
7751 DECL_INITIAL (*fieldlistp) = 0;
7754 fieldlistp = &DECL_CHAIN (*fieldlistp);
7757 /* Now we have the truly final field list.
7758 Store it in this type and in the variants. */
7760 TYPE_FIELDS (t) = fieldlist;
7762 /* If there are lots of fields, sort so we can look through them fast.
7763 We arbitrarily consider 16 or more elts to be "a lot". */
7768 for (x = fieldlist; x; x = DECL_CHAIN (x))
7770 if (len > 15 || DECL_NAME (x) == NULL)
7778 struct lang_type *space;
7779 struct sorted_fields_type *space2;
7781 len += list_length (x);
7783 /* Use the same allocation policy here that make_node uses, to
7784 ensure that this lives as long as the rest of the struct decl.
7785 All decls in an inline function need to be saved. */
7787 space = ggc_cleared_alloc<struct lang_type> ();
7788 space2 = (sorted_fields_type *) ggc_internal_alloc
7789 (sizeof (struct sorted_fields_type) + len * sizeof (tree));
7793 field_array = &space2->elts[0];
7794 for (x = fieldlist; x; x = DECL_CHAIN (x))
7796 field_array[len++] = x;
7798 /* If there is anonymous struct or union, break out of the loop. */
7799 if (DECL_NAME (x) == NULL)
7802 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7805 TYPE_LANG_SPECIFIC (t) = space;
7806 TYPE_LANG_SPECIFIC (t)->s->len = len;
7807 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
7808 qsort (field_array, len, sizeof (tree), field_decl_cmp);
7813 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
7815 TYPE_FIELDS (x) = TYPE_FIELDS (t);
7816 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
7817 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
7818 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
7819 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
7822 /* If this was supposed to be a transparent union, but we can't
7823 make it one, warn and turn off the flag. */
7824 if (TREE_CODE (t) == UNION_TYPE
7825 && TYPE_TRANSPARENT_AGGR (t)
7826 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
7828 TYPE_TRANSPARENT_AGGR (t) = 0;
7829 warning_at (loc, 0, "union cannot be made transparent");
7832 /* If this structure or union completes the type of any previous
7833 variable declaration, lay it out and output its rtl. */
7834 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
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);
7849 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
7851 /* Update type location to the one of the definition, instead of e.g.
7852 a forward declaration. */
7853 if (TYPE_STUB_DECL (t))
7854 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
7856 /* Finish debugging output for this type. */
7857 rest_of_type_compilation (t, toplevel);
7859 /* If we're inside a function proper, i.e. not file-scope and not still
7860 parsing parameters, then arrange for the size of a variable sized type
7862 if (building_stmt_list_p () && variably_modified_type_p (t, NULL_TREE))
7863 add_stmt (build_stmt (loc,
7864 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
7866 if (warn_cxx_compat)
7867 warn_cxx_compat_finish_struct (fieldlist);
7869 struct_parse_info->struct_types.release ();
7870 struct_parse_info->fields.release ();
7871 struct_parse_info->typedefs_seen.release ();
7872 XDELETE (struct_parse_info);
7874 struct_parse_info = enclosing_struct_parse_info;
7876 /* If this struct is defined inside a struct, add it to
7879 && struct_parse_info != NULL
7880 && !in_sizeof && !in_typeof && !in_alignof)
7881 struct_parse_info->struct_types.safe_push (t);
7886 /* Lay out the type T, and its element type, and so on. */
7889 layout_array_type (tree t)
7891 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
7892 layout_array_type (TREE_TYPE (t));
7896 /* Begin compiling the definition of an enumeration type.
7897 NAME is its name (or null if anonymous).
7898 LOC is the enum's location.
7899 Returns the type object, as yet incomplete.
7900 Also records info about it so that build_enumerator
7901 may be used to declare the individual values as they are read. */
7904 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
7906 tree enumtype = NULL_TREE;
7907 location_t enumloc = UNKNOWN_LOCATION;
7909 /* If this is the real definition for a previous forward reference,
7910 fill in the contents in the same object that used to be the
7911 forward reference. */
7913 if (name != NULL_TREE)
7914 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc);
7916 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
7918 enumtype = make_node (ENUMERAL_TYPE);
7919 pushtag (loc, name, enumtype);
7922 if (C_TYPE_BEING_DEFINED (enumtype))
7923 error_at (loc, "nested redefinition of %<enum %E%>", name);
7925 C_TYPE_BEING_DEFINED (enumtype) = 1;
7927 if (TYPE_VALUES (enumtype) != 0)
7929 /* This enum is a named one that has been declared already. */
7930 error_at (loc, "redeclaration of %<enum %E%>", name);
7931 if (enumloc != UNKNOWN_LOCATION)
7932 inform (enumloc, "originally defined here");
7934 /* Completely replace its old definition.
7935 The old enumerators remain defined, however. */
7936 TYPE_VALUES (enumtype) = 0;
7939 the_enum->enum_next_value = integer_zero_node;
7940 the_enum->enum_overflow = 0;
7942 if (flag_short_enums)
7943 TYPE_PACKED (enumtype) = 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_SIZE (enumtype) = 0;
8018 /* If the precision of the type was specific with an attribute and it
8019 was too small, give an error. Otherwise, use it. */
8020 if (TYPE_PRECISION (enumtype))
8022 if (precision > TYPE_PRECISION (enumtype))
8023 error ("specified mode too small for enumeral values");
8026 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
8028 layout_type (enumtype);
8030 if (values != error_mark_node)
8032 /* Change the type of the enumerators to be the enum type. We
8033 need to do this irrespective of the size of the enum, for
8034 proper type checking. Replace the DECL_INITIALs of the
8035 enumerators, and the value slots of the list, with copies
8036 that have the enum type; they cannot be modified in place
8037 because they may be shared (e.g. integer_zero_node) Finally,
8038 change the purpose slots to point to the names of the decls. */
8039 for (pair = values; pair; pair = TREE_CHAIN (pair))
8041 tree enu = TREE_PURPOSE (pair);
8042 tree ini = DECL_INITIAL (enu);
8044 TREE_TYPE (enu) = enumtype;
8046 /* The ISO C Standard mandates enumerators to have type int,
8047 even though the underlying type of an enum type is
8048 unspecified. However, GCC allows enumerators of any
8049 integer type as an extensions. build_enumerator()
8050 converts any enumerators that fit in an int to type int,
8051 to avoid promotions to unsigned types when comparing
8052 integers with enumerators that fit in the int range.
8053 When -pedantic is given, build_enumerator() would have
8054 already warned about those that don't fit. Here we
8055 convert the rest to the enumerator type. */
8056 if (TREE_TYPE (ini) != integer_type_node)
8057 ini = convert (enumtype, ini);
8059 DECL_INITIAL (enu) = ini;
8060 TREE_PURPOSE (pair) = DECL_NAME (enu);
8061 TREE_VALUE (pair) = ini;
8064 TYPE_VALUES (enumtype) = values;
8067 /* Record the min/max values so that we can warn about bit-field
8068 enumerations that are too small for the values. */
8069 lt = ggc_cleared_alloc<struct lang_type> ();
8070 lt->enum_min = minnode;
8071 lt->enum_max = maxnode;
8072 TYPE_LANG_SPECIFIC (enumtype) = lt;
8074 /* Fix up all variant types of this enum type. */
8075 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
8077 if (tem == enumtype)
8079 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
8080 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
8081 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
8082 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
8083 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
8084 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
8085 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
8086 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
8087 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
8088 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
8089 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
8092 /* Finish debugging output for this type. */
8093 rest_of_type_compilation (enumtype, toplevel);
8095 /* If this enum is defined inside a struct, add it to
8098 && struct_parse_info != NULL
8099 && !in_sizeof && !in_typeof && !in_alignof)
8100 struct_parse_info->struct_types.safe_push (enumtype);
8105 /* Build and install a CONST_DECL for one value of the
8106 current enumeration type (one that was begun with start_enum).
8107 DECL_LOC is the location of the enumerator.
8108 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
8109 Return a tree-list containing the CONST_DECL and its value.
8110 Assignment of sequential values by default is handled here. */
8113 build_enumerator (location_t decl_loc, location_t loc,
8114 struct c_enum_contents *the_enum, tree name, tree value)
8118 /* Validate and default VALUE. */
8122 /* Don't issue more errors for error_mark_node (i.e. an
8123 undeclared identifier) - just ignore the value expression. */
8124 if (value == error_mark_node)
8126 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
8128 error_at (loc, "enumerator value for %qE is not an integer constant",
8134 if (TREE_CODE (value) != INTEGER_CST)
8136 value = c_fully_fold (value, false, NULL);
8137 if (TREE_CODE (value) == INTEGER_CST)
8138 pedwarn (loc, OPT_Wpedantic,
8139 "enumerator value for %qE is not an integer "
8140 "constant expression", name);
8142 if (TREE_CODE (value) != INTEGER_CST)
8144 error ("enumerator value for %qE is not an integer constant",
8150 value = default_conversion (value);
8151 constant_expression_warning (value);
8156 /* Default based on previous value. */
8157 /* It should no longer be possible to have NON_LVALUE_EXPR
8161 value = the_enum->enum_next_value;
8162 if (the_enum->enum_overflow)
8163 error_at (loc, "overflow in enumeration values");
8165 /* Even though the underlying type of an enum is unspecified, the
8166 type of enumeration constants is explicitly defined as int
8167 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
8169 else if (!int_fits_type_p (value, integer_type_node))
8170 pedwarn (loc, OPT_Wpedantic,
8171 "ISO C restricts enumerator values to range of %<int%>");
8173 /* The ISO C Standard mandates enumerators to have type int, even
8174 though the underlying type of an enum type is unspecified.
8175 However, GCC allows enumerators of any integer type as an
8176 extensions. Here we convert any enumerators that fit in an int
8177 to type int, to avoid promotions to unsigned types when comparing
8178 integers with enumerators that fit in the int range. When
8179 -pedantic is given, we would have already warned about those that
8180 don't fit. We have to do this here rather than in finish_enum
8181 because this value may be used to define more enumerators. */
8182 if (int_fits_type_p (value, integer_type_node))
8183 value = convert (integer_type_node, value);
8185 /* Set basis for default for next value. */
8186 the_enum->enum_next_value
8187 = build_binary_op (EXPR_LOC_OR_LOC (value, input_location),
8188 PLUS_EXPR, value, integer_one_node, 0);
8189 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
8191 /* Now create a declaration for the enum value name. */
8193 type = TREE_TYPE (value);
8194 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
8195 TYPE_PRECISION (integer_type_node)),
8196 (TYPE_PRECISION (type)
8197 >= TYPE_PRECISION (integer_type_node)
8198 && TYPE_UNSIGNED (type)));
8200 decl = build_decl (decl_loc, CONST_DECL, name, type);
8201 DECL_INITIAL (decl) = convert (type, value);
8204 return tree_cons (decl, value, NULL_TREE);
8208 /* Create the FUNCTION_DECL for a function definition.
8209 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
8210 the declaration; they describe the function's name and the type it returns,
8211 but twisted together in a fashion that parallels the syntax of C.
8213 This function creates a binding context for the function body
8214 as well as setting up the FUNCTION_DECL in current_function_decl.
8216 Returns 1 on success. If the DECLARATOR is not suitable for a function
8217 (it defines a datum instead), we return 0, which tells
8218 yyparse to report a parse error. */
8221 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
8224 tree decl1, old_decl;
8225 tree restype, resdecl;
8228 current_function_returns_value = 0; /* Assume, until we see it does. */
8229 current_function_returns_null = 0;
8230 current_function_returns_abnormally = 0;
8231 warn_about_return_type = 0;
8232 c_switch_stack = NULL;
8234 /* Indicate no valid break/continue context by setting these variables
8235 to some non-null, non-label value. We'll notice and emit the proper
8236 error message in c_finish_bc_stmt. */
8237 c_break_label = c_cont_label = size_zero_node;
8239 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
8240 &attributes, NULL, NULL, DEPRECATED_NORMAL);
8242 /* If the declarator is not suitable for a function definition,
8243 cause a syntax error. */
8245 || TREE_CODE (decl1) != FUNCTION_DECL)
8248 loc = DECL_SOURCE_LOCATION (decl1);
8250 c_decl_attributes (&decl1, attributes, 0);
8252 if (DECL_DECLARED_INLINE_P (decl1)
8253 && DECL_UNINLINABLE (decl1)
8254 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
8255 warning_at (loc, OPT_Wattributes,
8256 "inline function %qD given attribute noinline",
8259 /* Handle gnu_inline attribute. */
8260 if (declspecs->inline_p
8261 && !flag_gnu89_inline
8262 && TREE_CODE (decl1) == FUNCTION_DECL
8263 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
8264 || current_function_decl))
8266 if (declspecs->storage_class != csc_static)
8267 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
8270 announce_function (decl1);
8272 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
8274 error_at (loc, "return type is an incomplete type");
8275 /* Make it return void instead. */
8277 = build_function_type (void_type_node,
8278 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
8281 if (warn_about_return_type)
8282 warn_defaults_to (loc, flag_isoc99 ? OPT_Wimplicit_int
8283 : (warn_return_type ? OPT_Wreturn_type
8284 : OPT_Wimplicit_int),
8285 "return type defaults to %<int%>");
8287 /* Make the init_value nonzero so pushdecl knows this is not tentative.
8288 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
8289 DECL_INITIAL (decl1) = error_mark_node;
8291 /* A nested function is not global. */
8292 if (current_function_decl != 0)
8293 TREE_PUBLIC (decl1) = 0;
8295 /* If this definition isn't a prototype and we had a prototype declaration
8296 before, copy the arg type info from that prototype. */
8297 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
8298 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
8300 current_function_prototype_locus = UNKNOWN_LOCATION;
8301 current_function_prototype_built_in = false;
8302 current_function_prototype_arg_types = NULL_TREE;
8303 if (!prototype_p (TREE_TYPE (decl1)))
8305 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
8306 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
8307 TREE_TYPE (TREE_TYPE (old_decl))))
8309 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
8311 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
8312 current_function_prototype_built_in
8313 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
8314 current_function_prototype_arg_types
8315 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
8317 if (TREE_PUBLIC (decl1))
8319 /* If there is an external prototype declaration of this
8320 function, record its location but do not copy information
8321 to this decl. This may be an invisible declaration
8322 (built-in or in a scope which has finished) or simply
8323 have more refined argument types than any declaration
8325 struct c_binding *b;
8326 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
8327 if (B_IN_SCOPE (b, external_scope))
8331 tree ext_decl, ext_type;
8333 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
8334 if (TREE_CODE (ext_type) == FUNCTION_TYPE
8335 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
8336 TREE_TYPE (ext_type)))
8338 current_function_prototype_locus
8339 = DECL_SOURCE_LOCATION (ext_decl);
8340 current_function_prototype_built_in
8341 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
8342 current_function_prototype_arg_types
8343 = TYPE_ARG_TYPES (ext_type);
8349 /* Optionally warn of old-fashioned def with no previous prototype. */
8350 if (warn_strict_prototypes
8351 && old_decl != error_mark_node
8352 && !prototype_p (TREE_TYPE (decl1))
8353 && C_DECL_ISNT_PROTOTYPE (old_decl))
8354 warning_at (loc, OPT_Wstrict_prototypes,
8355 "function declaration isn%'t a prototype");
8356 /* Optionally warn of any global def with no previous prototype. */
8357 else if (warn_missing_prototypes
8358 && old_decl != error_mark_node
8359 && TREE_PUBLIC (decl1)
8360 && !MAIN_NAME_P (DECL_NAME (decl1))
8361 && C_DECL_ISNT_PROTOTYPE (old_decl)
8362 && !DECL_DECLARED_INLINE_P (decl1))
8363 warning_at (loc, OPT_Wmissing_prototypes,
8364 "no previous prototype for %qD", decl1);
8365 /* Optionally warn of any def with no previous prototype
8366 if the function has already been used. */
8367 else if (warn_missing_prototypes
8369 && old_decl != error_mark_node
8370 && TREE_USED (old_decl)
8371 && !prototype_p (TREE_TYPE (old_decl)))
8372 warning_at (loc, OPT_Wmissing_prototypes,
8373 "%qD was used with no prototype before its definition", decl1);
8374 /* Optionally warn of any global def with no previous declaration. */
8375 else if (warn_missing_declarations
8376 && TREE_PUBLIC (decl1)
8378 && !MAIN_NAME_P (DECL_NAME (decl1))
8379 && !DECL_DECLARED_INLINE_P (decl1))
8380 warning_at (loc, OPT_Wmissing_declarations,
8381 "no previous declaration for %qD",
8383 /* Optionally warn of any def with no previous declaration
8384 if the function has already been used. */
8385 else if (warn_missing_declarations
8387 && old_decl != error_mark_node
8388 && TREE_USED (old_decl)
8389 && C_DECL_IMPLICIT (old_decl))
8390 warning_at (loc, OPT_Wmissing_declarations,
8391 "%qD was used with no declaration before its definition", decl1);
8393 /* This function exists in static storage.
8394 (This does not mean `static' in the C sense!) */
8395 TREE_STATIC (decl1) = 1;
8397 /* This is the earliest point at which we might know the assembler
8398 name of the function. Thus, if it's set before this, die horribly. */
8399 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
8401 /* If #pragma weak was used, mark the decl weak now. */
8402 if (current_scope == file_scope)
8403 maybe_apply_pragma_weak (decl1);
8405 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8406 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
8408 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
8409 != integer_type_node)
8410 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
8411 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1))))
8412 pedwarn (loc, OPT_Wmain, "%<_Atomic%>-qualified return type of %qD",
8415 check_main_parameter_types (decl1);
8417 if (!TREE_PUBLIC (decl1))
8418 pedwarn (loc, OPT_Wmain,
8419 "%qD is normally a non-static function", decl1);
8422 /* Record the decl so that the function name is defined.
8423 If we already have a decl for this name, and it is a FUNCTION_DECL,
8424 use the old decl. */
8426 current_function_decl = pushdecl (decl1);
8429 declare_parm_level ();
8431 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
8432 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
8433 DECL_ARTIFICIAL (resdecl) = 1;
8434 DECL_IGNORED_P (resdecl) = 1;
8435 DECL_RESULT (current_function_decl) = resdecl;
8437 start_fname_decls ();
8442 /* Subroutine of store_parm_decls which handles new-style function
8443 definitions (prototype format). The parms already have decls, so we
8444 need only record them as in effect and complain if any redundant
8445 old-style parm decls were written. */
8447 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
8453 if (current_scope->bindings)
8455 error_at (DECL_SOURCE_LOCATION (fndecl),
8456 "old-style parameter declarations in prototyped "
8457 "function definition");
8459 /* Get rid of the old-style declarations. */
8463 /* Don't issue this warning for nested functions, and don't issue this
8464 warning if we got here because ARG_INFO_TYPES was error_mark_node
8465 (this happens when a function definition has just an ellipsis in
8466 its parameter list). */
8467 else if (!in_system_header_at (input_location)
8468 && !current_function_scope
8469 && arg_info->types != error_mark_node)
8470 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
8471 "traditional C rejects ISO C style function definitions");
8473 /* Now make all the parameter declarations visible in the function body.
8474 We can bypass most of the grunt work of pushdecl. */
8475 for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl))
8477 DECL_CONTEXT (decl) = current_function_decl;
8478 if (DECL_NAME (decl))
8480 bind (DECL_NAME (decl), decl, current_scope,
8481 /*invisible=*/false, /*nested=*/false,
8483 if (!TREE_USED (decl))
8484 warn_if_shadowing (decl);
8487 error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted");
8490 /* Record the parameter list in the function declaration. */
8491 DECL_ARGUMENTS (fndecl) = arg_info->parms;
8493 /* Now make all the ancillary declarations visible, likewise. */
8494 for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl))
8496 DECL_CONTEXT (decl) = current_function_decl;
8497 if (DECL_NAME (decl))
8498 bind (DECL_NAME (decl), decl, current_scope,
8499 /*invisible=*/false,
8500 /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL),
8504 /* And all the tag declarations. */
8505 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
8507 bind (tag->id, tag->type, current_scope,
8508 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
8511 /* Subroutine of store_parm_decls which handles old-style function
8512 definitions (separate parameter list and declarations). */
8515 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
8517 struct c_binding *b;
8518 tree parm, decl, last;
8519 tree parmids = arg_info->parms;
8520 hash_set<tree> seen_args;
8522 if (!in_system_header_at (input_location))
8523 warning_at (DECL_SOURCE_LOCATION (fndecl),
8524 OPT_Wold_style_definition, "old-style function definition");
8526 /* Match each formal parameter name with its declaration. Save each
8527 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8528 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8530 if (TREE_VALUE (parm) == 0)
8532 error_at (DECL_SOURCE_LOCATION (fndecl),
8533 "parameter name missing from parameter list");
8534 TREE_PURPOSE (parm) = 0;
8538 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
8539 if (b && B_IN_CURRENT_SCOPE (b))
8542 /* Skip erroneous parameters. */
8543 if (decl == error_mark_node)
8545 /* If we got something other than a PARM_DECL it is an error. */
8546 if (TREE_CODE (decl) != PARM_DECL)
8547 error_at (DECL_SOURCE_LOCATION (decl),
8548 "%qD declared as a non-parameter", decl);
8549 /* If the declaration is already marked, we have a duplicate
8550 name. Complain and ignore the duplicate. */
8551 else if (seen_args.contains (decl))
8553 error_at (DECL_SOURCE_LOCATION (decl),
8554 "multiple parameters named %qD", decl);
8555 TREE_PURPOSE (parm) = 0;
8558 /* If the declaration says "void", complain and turn it into
8560 else if (VOID_TYPE_P (TREE_TYPE (decl)))
8562 error_at (DECL_SOURCE_LOCATION (decl),
8563 "parameter %qD declared with void type", decl);
8564 TREE_TYPE (decl) = integer_type_node;
8565 DECL_ARG_TYPE (decl) = integer_type_node;
8566 layout_decl (decl, 0);
8568 warn_if_shadowing (decl);
8570 /* If no declaration found, default to int. */
8573 /* FIXME diagnostics: This should be the location of the argument,
8574 not the FNDECL. E.g., for an old-style declaration
8576 int f10(v) { blah; }
8578 We should use the location of the V, not the F10.
8579 Unfortunately, the V is an IDENTIFIER_NODE which has no
8580 location. In the future we need locations for c_arg_info
8583 See gcc.dg/Wshadow-3.c for an example of this problem. */
8584 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
8585 PARM_DECL, TREE_VALUE (parm), integer_type_node);
8586 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
8588 warn_if_shadowing (decl);
8591 pedwarn (DECL_SOURCE_LOCATION (decl),
8592 OPT_Wimplicit_int, "type of %qD defaults to %<int%>",
8595 warning_at (DECL_SOURCE_LOCATION (decl),
8596 OPT_Wmissing_parameter_type,
8597 "type of %qD defaults to %<int%>", decl);
8600 TREE_PURPOSE (parm) = decl;
8601 seen_args.add (decl);
8604 /* Now examine the parms chain for incomplete declarations
8605 and declarations with no corresponding names. */
8607 for (b = current_scope->bindings; b; b = b->prev)
8610 if (TREE_CODE (parm) != PARM_DECL)
8613 if (TREE_TYPE (parm) != error_mark_node
8614 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
8616 error_at (DECL_SOURCE_LOCATION (parm),
8617 "parameter %qD has incomplete type", parm);
8618 TREE_TYPE (parm) = error_mark_node;
8621 if (!seen_args.contains (parm))
8623 error_at (DECL_SOURCE_LOCATION (parm),
8624 "declaration for parameter %qD but no such parameter",
8627 /* Pretend the parameter was not missing.
8628 This gets us to a standard state and minimizes
8629 further error messages. */
8630 parmids = chainon (parmids, tree_cons (parm, 0, 0));
8634 /* Chain the declarations together in the order of the list of
8635 names. Store that chain in the function decl, replacing the
8636 list of names. Update the current scope to match. */
8637 DECL_ARGUMENTS (fndecl) = 0;
8639 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8640 if (TREE_PURPOSE (parm))
8642 if (parm && TREE_PURPOSE (parm))
8644 last = TREE_PURPOSE (parm);
8645 DECL_ARGUMENTS (fndecl) = last;
8647 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
8648 if (TREE_PURPOSE (parm))
8650 DECL_CHAIN (last) = TREE_PURPOSE (parm);
8651 last = TREE_PURPOSE (parm);
8653 DECL_CHAIN (last) = 0;
8656 /* If there was a previous prototype,
8657 set the DECL_ARG_TYPE of each argument according to
8658 the type previously specified, and report any mismatches. */
8660 if (current_function_prototype_arg_types)
8663 for (parm = DECL_ARGUMENTS (fndecl),
8664 type = current_function_prototype_arg_types;
8665 parm || (type && TREE_VALUE (type) != error_mark_node
8666 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
8667 parm = DECL_CHAIN (parm), type = TREE_CHAIN (type))
8669 if (parm == 0 || type == 0
8670 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
8672 if (current_function_prototype_built_in)
8673 warning_at (DECL_SOURCE_LOCATION (fndecl),
8674 0, "number of arguments doesn%'t match "
8675 "built-in prototype");
8678 /* FIXME diagnostics: This should be the location of
8679 FNDECL, but there is bug when a prototype is
8680 declared inside function context, but defined
8681 outside of it (e.g., gcc.dg/pr15698-2.c). In
8682 which case FNDECL gets the location of the
8683 prototype, not the definition. */
8684 error_at (input_location,
8685 "number of arguments doesn%'t match prototype");
8687 error_at (current_function_prototype_locus,
8688 "prototype declaration");
8692 /* Type for passing arg must be consistent with that
8693 declared for the arg. ISO C says we take the unqualified
8694 type for parameters declared with qualified type. */
8695 if (TREE_TYPE (parm) != error_mark_node
8696 && TREE_TYPE (type) != error_mark_node
8697 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
8698 != TYPE_ATOMIC (TREE_VALUE (type)))
8699 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
8700 TYPE_MAIN_VARIANT (TREE_VALUE (type)))))
8702 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
8703 == TYPE_ATOMIC (TREE_VALUE (type)))
8704 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
8705 == TYPE_MAIN_VARIANT (TREE_VALUE (type))))
8707 /* Adjust argument to match prototype. E.g. a previous
8708 `int foo(float);' prototype causes
8709 `int foo(x) float x; {...}' to be treated like
8710 `int foo(float x) {...}'. This is particularly
8711 useful for argument types like uid_t. */
8712 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
8714 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
8715 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
8716 && TYPE_PRECISION (TREE_TYPE (parm))
8717 < TYPE_PRECISION (integer_type_node))
8718 DECL_ARG_TYPE (parm)
8719 = c_type_promotes_to (TREE_TYPE (parm));
8721 /* ??? Is it possible to get here with a
8722 built-in prototype or will it always have
8723 been diagnosed as conflicting with an
8724 old-style definition and discarded? */
8725 if (current_function_prototype_built_in)
8726 warning_at (DECL_SOURCE_LOCATION (parm),
8727 OPT_Wpedantic, "promoted argument %qD "
8728 "doesn%'t match built-in prototype", parm);
8731 pedwarn (DECL_SOURCE_LOCATION (parm),
8732 OPT_Wpedantic, "promoted argument %qD "
8733 "doesn%'t match prototype", parm);
8734 pedwarn (current_function_prototype_locus, OPT_Wpedantic,
8735 "prototype declaration");
8740 if (current_function_prototype_built_in)
8741 warning_at (DECL_SOURCE_LOCATION (parm),
8742 0, "argument %qD doesn%'t match "
8743 "built-in prototype", parm);
8746 error_at (DECL_SOURCE_LOCATION (parm),
8747 "argument %qD doesn%'t match prototype", parm);
8748 error_at (current_function_prototype_locus,
8749 "prototype declaration");
8754 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
8757 /* Otherwise, create a prototype that would match. */
8761 tree actual = 0, last = 0, type;
8763 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm))
8765 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
8767 TREE_CHAIN (last) = type;
8772 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
8774 TREE_CHAIN (last) = type;
8778 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8779 of the type of this function, but we need to avoid having this
8780 affect the types of other similarly-typed functions, so we must
8781 first force the generation of an identical (but separate) type
8782 node for the relevant function type. The new node we create
8783 will be a variant of the main variant of the original function
8786 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
8788 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
8792 /* Store parameter declarations passed in ARG_INFO into the current
8793 function declaration. */
8796 store_parm_decls_from (struct c_arg_info *arg_info)
8798 current_function_arg_info = arg_info;
8799 store_parm_decls ();
8802 /* Store the parameter declarations into the current function declaration.
8803 This is called after parsing the parameter declarations, before
8804 digesting the body of the function.
8806 For an old-style definition, construct a prototype out of the old-style
8807 parameter declarations and inject it into the function's type. */
8810 store_parm_decls (void)
8812 tree fndecl = current_function_decl;
8815 /* The argument information block for FNDECL. */
8816 struct c_arg_info *arg_info = current_function_arg_info;
8817 current_function_arg_info = 0;
8819 /* True if this definition is written with a prototype. Note:
8820 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8821 list in a function definition as equivalent to (void) -- an
8822 empty argument list specifies the function has no parameters,
8823 but only (void) sets up a prototype for future calls. */
8824 proto = arg_info->types != 0;
8827 store_parm_decls_newstyle (fndecl, arg_info);
8829 store_parm_decls_oldstyle (fndecl, arg_info);
8831 /* The next call to push_scope will be a function body. */
8833 next_is_function_body = true;
8835 /* Write a record describing this function definition to the prototypes
8836 file (if requested). */
8838 gen_aux_info_record (fndecl, 1, 0, proto);
8840 /* Initialize the RTL code for the function. */
8841 allocate_struct_function (fndecl, false);
8843 if (warn_unused_local_typedefs)
8844 cfun->language = ggc_cleared_alloc<language_function> ();
8846 /* Begin the statement tree for this function. */
8847 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
8849 /* ??? Insert the contents of the pending sizes list into the function
8850 to be evaluated. The only reason left to have this is
8851 void foo(int n, int array[n++])
8852 because we throw away the array type in favor of a pointer type, and
8853 thus won't naturally see the SAVE_EXPR containing the increment. All
8854 other pending sizes would be handled by gimplify_parameters. */
8855 if (arg_info->pending_sizes)
8856 add_stmt (arg_info->pending_sizes);
8859 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8860 c_finish_omp_declare_simd for function prototypes. No diagnostics
8864 temp_store_parm_decls (tree fndecl, tree parms)
8867 for (tree p = parms; p; p = DECL_CHAIN (p))
8869 DECL_CONTEXT (p) = fndecl;
8871 bind (DECL_NAME (p), p, current_scope,
8872 /*invisible=*/false, /*nested=*/false,
8877 /* Undo what temp_store_parm_decls did. */
8880 temp_pop_parm_decls (void)
8882 /* Clear all bindings in this temporary scope, so that
8883 pop_scope doesn't create a BLOCK. */
8884 struct c_binding *b = current_scope->bindings;
8885 current_scope->bindings = NULL;
8886 for (; b; b = free_binding_and_advance (b))
8888 gcc_assert (TREE_CODE (b->decl) == PARM_DECL);
8889 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
8890 I_SYMBOL_BINDING (b->id) = b->shadowed;
8891 if (b->shadowed && b->shadowed->u.type)
8892 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
8898 /* Finish up a function declaration and compile that function
8899 all the way to assembler language output. Then free the storage
8900 for the function definition.
8902 This is called after parsing the body of the function definition. */
8905 finish_function (void)
8907 tree fndecl = current_function_decl;
8909 if (c_dialect_objc ())
8910 objc_finish_function ();
8912 if (TREE_CODE (fndecl) == FUNCTION_DECL
8913 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
8915 tree args = DECL_ARGUMENTS (fndecl);
8916 for (; args; args = DECL_CHAIN (args))
8918 tree type = TREE_TYPE (args);
8919 if (INTEGRAL_TYPE_P (type)
8920 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
8921 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
8925 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
8926 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
8928 /* Must mark the RESULT_DECL as being in this function. */
8930 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
8931 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
8933 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
8934 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
8935 == integer_type_node && flag_isoc99)
8937 /* Hack. We don't want the middle-end to warn that this return
8938 is unreachable, so we mark its location as special. Using
8939 UNKNOWN_LOCATION has the problem that it gets clobbered in
8940 annotate_one_with_locus. A cleaner solution might be to
8941 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8943 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
8946 /* Tie off the statement tree for this function. */
8947 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
8949 /* If the function has _Cilk_spawn in front of a function call inside it
8950 i.e. it is a spawning function, then add the appropriate Cilk plus
8951 functions inside. */
8952 if (fn_contains_cilk_spawn_p (cfun))
8953 cfun->cilk_frame_decl = insert_cilk_frame (fndecl);
8955 finish_fname_decls ();
8957 /* Complain if there's just no return statement. */
8958 if (warn_return_type
8959 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
8960 && !current_function_returns_value && !current_function_returns_null
8961 /* Don't complain if we are no-return. */
8962 && !current_function_returns_abnormally
8963 /* Don't complain if we are declared noreturn. */
8964 && !TREE_THIS_VOLATILE (fndecl)
8965 /* Don't warn for main(). */
8966 && !MAIN_NAME_P (DECL_NAME (fndecl))
8967 /* Or if they didn't actually specify a return type. */
8968 && !C_FUNCTION_IMPLICIT_INT (fndecl)
8969 /* Normally, with -Wreturn-type, flow will complain, but we might
8970 optimize out static functions. */
8971 && !TREE_PUBLIC (fndecl))
8973 warning (OPT_Wreturn_type,
8974 "no return statement in function returning non-void");
8975 TREE_NO_WARNING (fndecl) = 1;
8978 /* Complain about parameters that are only set, but never otherwise used. */
8979 if (warn_unused_but_set_parameter)
8983 for (decl = DECL_ARGUMENTS (fndecl);
8985 decl = DECL_CHAIN (decl))
8986 if (TREE_USED (decl)
8987 && TREE_CODE (decl) == PARM_DECL
8988 && !DECL_READ_P (decl)
8990 && !DECL_ARTIFICIAL (decl)
8991 && !TREE_NO_WARNING (decl))
8992 warning_at (DECL_SOURCE_LOCATION (decl),
8993 OPT_Wunused_but_set_parameter,
8994 "parameter %qD set but not used", decl);
8997 /* Complain about locally defined typedefs that are not used in this
8999 maybe_warn_unused_local_typedefs ();
9001 /* Store the end of the function, so that we get good line number
9002 info for the epilogue. */
9003 cfun->function_end_locus = input_location;
9005 /* Finalize the ELF visibility for the function. */
9006 c_determine_visibility (fndecl);
9008 /* For GNU C extern inline functions disregard inline limits. */
9009 if (DECL_EXTERNAL (fndecl)
9010 && DECL_DECLARED_INLINE_P (fndecl))
9011 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
9013 /* Genericize before inlining. Delay genericizing nested functions
9014 until their parent function is genericized. Since finalizing
9015 requires GENERIC, delay that as well. */
9017 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
9018 && !undef_nested_function)
9020 if (!decl_function_context (fndecl))
9022 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
9023 c_genericize (fndecl);
9025 /* ??? Objc emits functions after finalizing the compilation unit.
9026 This should be cleaned up later and this conditional removed. */
9027 if (symtab->global_info_ready)
9029 cgraph_node::add_new_function (fndecl, false);
9032 cgraph_node::finalize_function (fndecl, false);
9036 /* Register this function with cgraph just far enough to get it
9037 added to our parent's nested function list. Handy, since the
9038 C front end doesn't have such a list. */
9039 (void) cgraph_node::get_create (fndecl);
9043 if (!decl_function_context (fndecl))
9044 undef_nested_function = false;
9046 if (cfun->language != NULL)
9048 ggc_free (cfun->language);
9049 cfun->language = NULL;
9052 /* We're leaving the context of this function, so zap cfun.
9053 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
9054 tree_rest_of_compilation. */
9056 current_function_decl = NULL;
9059 /* Check the declarations given in a for-loop for satisfying the C99
9060 constraints. If exactly one such decl is found, return it. LOC is
9061 the location of the opening parenthesis of the for loop. The last
9062 parameter allows you to control the "for loop initial declarations
9063 are only allowed in C99 mode". Normally, you should pass
9064 flag_isoc99 as that parameter. But in some cases (Objective-C
9065 foreach loop, for example) we want to run the checks in this
9066 function even if not in C99 mode, so we allow the caller to turn
9067 off the error about not being in C99 mode.
9071 check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error)
9073 struct c_binding *b;
9074 tree one_decl = NULL_TREE;
9077 if (!turn_off_iso_c99_error)
9079 static bool hint = true;
9080 /* If we get here, declarations have been used in a for loop without
9081 the C99 for loop scope. This doesn't make much sense, so don't
9083 error_at (loc, "%<for%> loop initial declarations "
9084 "are only allowed in C99 or C11 mode");
9088 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
9089 "to compile your code");
9094 /* C99 subclause 6.8.5 paragraph 3:
9096 [#3] The declaration part of a for statement shall only
9097 declare identifiers for objects having storage class auto or
9100 It isn't clear whether, in this sentence, "identifiers" binds to
9101 "shall only declare" or to "objects" - that is, whether all identifiers
9102 declared must be identifiers for objects, or whether the restriction
9103 only applies to those that are. (A question on this in comp.std.c
9104 in November 2000 received no answer.) We implement the strictest
9105 interpretation, to avoid creating an extension which later causes
9108 for (b = current_scope->bindings; b; b = b->prev)
9111 tree decl = b->decl;
9116 switch (TREE_CODE (decl))
9120 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
9121 if (TREE_STATIC (decl))
9123 "declaration of static variable %qD in %<for%> loop "
9124 "initial declaration", decl);
9125 else if (DECL_EXTERNAL (decl))
9127 "declaration of %<extern%> variable %qD in %<for%> loop "
9128 "initial declaration", decl);
9134 "%<struct %E%> declared in %<for%> loop initial "
9139 "%<union %E%> declared in %<for%> loop initial declaration",
9143 error_at (loc, "%<enum %E%> declared in %<for%> loop "
9144 "initial declaration", id);
9147 error_at (loc, "declaration of non-variable "
9148 "%qD in %<for%> loop initial declaration", decl);
9155 return n_decls == 1 ? one_decl : NULL_TREE;
9158 /* Save and reinitialize the variables
9159 used during compilation of a C function. */
9162 c_push_function_context (void)
9164 struct language_function *p = cfun->language;
9165 /* cfun->language might have been already allocated by the use of
9166 -Wunused-local-typedefs. In that case, just re-use it. */
9168 cfun->language = p = ggc_cleared_alloc<language_function> ();
9170 p->base.x_stmt_tree = c_stmt_tree;
9171 c_stmt_tree.x_cur_stmt_list = vec_safe_copy (c_stmt_tree.x_cur_stmt_list);
9172 p->x_break_label = c_break_label;
9173 p->x_cont_label = c_cont_label;
9174 p->x_switch_stack = c_switch_stack;
9175 p->arg_info = current_function_arg_info;
9176 p->returns_value = current_function_returns_value;
9177 p->returns_null = current_function_returns_null;
9178 p->returns_abnormally = current_function_returns_abnormally;
9179 p->warn_about_return_type = warn_about_return_type;
9181 push_function_context ();
9184 /* Restore the variables used during compilation of a C function. */
9187 c_pop_function_context (void)
9189 struct language_function *p;
9191 pop_function_context ();
9194 /* When -Wunused-local-typedefs is in effect, cfun->languages is
9195 used to store data throughout the life time of the current cfun,
9196 So don't deallocate it. */
9197 if (!warn_unused_local_typedefs)
9198 cfun->language = NULL;
9200 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
9201 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
9203 /* Stop pointing to the local nodes about to be freed. */
9204 /* But DECL_INITIAL must remain nonzero so we know this
9205 was an actual function definition. */
9206 DECL_INITIAL (current_function_decl) = error_mark_node;
9207 DECL_ARGUMENTS (current_function_decl) = 0;
9210 c_stmt_tree = p->base.x_stmt_tree;
9211 p->base.x_stmt_tree.x_cur_stmt_list = NULL;
9212 c_break_label = p->x_break_label;
9213 c_cont_label = p->x_cont_label;
9214 c_switch_stack = p->x_switch_stack;
9215 current_function_arg_info = p->arg_info;
9216 current_function_returns_value = p->returns_value;
9217 current_function_returns_null = p->returns_null;
9218 current_function_returns_abnormally = p->returns_abnormally;
9219 warn_about_return_type = p->warn_about_return_type;
9222 /* The functions below are required for functionality of doing
9223 function at once processing in the C front end. Currently these
9224 functions are not called from anywhere in the C front end, but as
9225 these changes continue, that will change. */
9227 /* Returns the stmt_tree (if any) to which statements are currently
9228 being added. If there is no active statement-tree, NULL is
9232 current_stmt_tree (void)
9234 return &c_stmt_tree;
9237 /* Return the global value of T as a symbol. */
9240 identifier_global_value (tree t)
9242 struct c_binding *b;
9244 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
9245 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
9251 /* In C, the only C-linkage public declaration is at file scope. */
9254 c_linkage_bindings (tree name)
9256 return identifier_global_value (name);
9259 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
9260 otherwise the name is found in ridpointers from RID_INDEX. */
9263 record_builtin_type (enum rid rid_index, const char *name, tree type)
9267 id = ridpointers[(int) rid_index];
9269 id = get_identifier (name);
9270 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
9272 if (debug_hooks->type_decl)
9273 debug_hooks->type_decl (decl, false);
9276 /* Build the void_list_node (void_type_node having been created). */
9278 build_void_list_node (void)
9280 tree t = build_tree_list (NULL_TREE, void_type_node);
9284 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
9287 build_c_parm (struct c_declspecs *specs, tree attrs,
9288 struct c_declarator *declarator)
9290 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
9293 ret->declarator = declarator;
9297 /* Return a declarator with nested attributes. TARGET is the inner
9298 declarator to which these attributes apply. ATTRS are the
9301 struct c_declarator *
9302 build_attrs_declarator (tree attrs, struct c_declarator *target)
9304 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9305 ret->kind = cdk_attrs;
9306 ret->declarator = target;
9307 ret->u.attrs = attrs;
9311 /* Return a declarator for a function with arguments specified by ARGS
9312 and return type specified by TARGET. */
9314 struct c_declarator *
9315 build_function_declarator (struct c_arg_info *args,
9316 struct c_declarator *target)
9318 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9319 ret->kind = cdk_function;
9320 ret->declarator = target;
9321 ret->u.arg_info = args;
9325 /* Return a declarator for the identifier IDENT (which may be
9326 NULL_TREE for an abstract declarator). */
9328 struct c_declarator *
9329 build_id_declarator (tree ident)
9331 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9333 ret->declarator = 0;
9335 /* Default value - may get reset to a more precise location. */
9336 ret->id_loc = input_location;
9340 /* Return something to represent absolute declarators containing a *.
9341 TARGET is the absolute declarator that the * contains.
9342 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
9343 to apply to the pointer type. */
9345 struct c_declarator *
9346 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
9347 struct c_declarator *target)
9351 struct c_declarator *itarget = target;
9352 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9353 if (type_quals_attrs)
9355 attrs = type_quals_attrs->attrs;
9356 quals = quals_from_declspecs (type_quals_attrs);
9357 if (attrs != NULL_TREE)
9358 itarget = build_attrs_declarator (attrs, target);
9360 ret->kind = cdk_pointer;
9361 ret->declarator = itarget;
9362 ret->u.pointer_quals = quals;
9366 /* Return a pointer to a structure for an empty list of declaration
9369 struct c_declspecs *
9370 build_null_declspecs (void)
9372 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
9373 memset (&ret->locations, 0, cdw_number_of_elements);
9378 ret->align_log = -1;
9379 ret->typespec_word = cts_none;
9380 ret->storage_class = csc_none;
9381 ret->expr_const_operands = true;
9382 ret->declspecs_seen_p = false;
9383 ret->typespec_kind = ctsk_none;
9384 ret->non_sc_seen_p = false;
9385 ret->typedef_p = false;
9386 ret->explicit_signed_p = false;
9387 ret->deprecated_p = false;
9388 ret->default_int_p = false;
9389 ret->long_p = false;
9390 ret->long_long_p = false;
9391 ret->short_p = false;
9392 ret->signed_p = false;
9393 ret->unsigned_p = false;
9394 ret->complex_p = false;
9395 ret->inline_p = false;
9396 ret->noreturn_p = false;
9397 ret->thread_p = false;
9398 ret->thread_gnu_p = false;
9399 ret->const_p = false;
9400 ret->volatile_p = false;
9401 ret->atomic_p = false;
9402 ret->restrict_p = false;
9403 ret->saturating_p = false;
9404 ret->alignas_p = false;
9405 ret->address_space = ADDR_SPACE_GENERIC;
9409 /* Add the address space ADDRSPACE to the declaration specifiers
9410 SPECS, returning SPECS. */
9412 struct c_declspecs *
9413 declspecs_add_addrspace (source_location location,
9414 struct c_declspecs *specs, addr_space_t as)
9416 specs->non_sc_seen_p = true;
9417 specs->declspecs_seen_p = true;
9419 if (!ADDR_SPACE_GENERIC_P (specs->address_space)
9420 && specs->address_space != as)
9421 error ("incompatible address space qualifiers %qs and %qs",
9422 c_addr_space_name (as),
9423 c_addr_space_name (specs->address_space));
9426 specs->address_space = as;
9427 specs->locations[cdw_address_space] = location;
9432 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9435 struct c_declspecs *
9436 declspecs_add_qual (source_location loc,
9437 struct c_declspecs *specs, tree qual)
9441 specs->non_sc_seen_p = true;
9442 specs->declspecs_seen_p = true;
9443 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
9444 && C_IS_RESERVED_WORD (qual));
9445 i = C_RID_CODE (qual);
9449 dupe = specs->const_p;
9450 specs->const_p = true;
9451 specs->locations[cdw_const] = loc;
9454 dupe = specs->volatile_p;
9455 specs->volatile_p = true;
9456 specs->locations[cdw_volatile] = loc;
9459 dupe = specs->restrict_p;
9460 specs->restrict_p = true;
9461 specs->locations[cdw_restrict] = loc;
9464 dupe = specs->atomic_p;
9465 specs->atomic_p = true;
9471 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %qE", qual);
9475 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9478 struct c_declspecs *
9479 declspecs_add_type (location_t loc, struct c_declspecs *specs,
9480 struct c_typespec spec)
9482 tree type = spec.spec;
9483 specs->non_sc_seen_p = true;
9484 specs->declspecs_seen_p = true;
9485 specs->typespec_kind = spec.kind;
9486 if (TREE_DEPRECATED (type))
9487 specs->deprecated_p = true;
9489 /* Handle type specifier keywords. */
9490 if (TREE_CODE (type) == IDENTIFIER_NODE
9491 && C_IS_RESERVED_WORD (type)
9492 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
9494 enum rid i = C_RID_CODE (type);
9497 error_at (loc, "two or more data types in declaration specifiers");
9500 if ((int) i <= (int) RID_LAST_MODIFIER)
9502 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9507 if (specs->long_long_p)
9509 error_at (loc, "%<long long long%> is too long for GCC");
9514 if (specs->typespec_word == cts_double)
9517 ("both %<long long%> and %<double%> in "
9518 "declaration specifiers"));
9521 pedwarn_c90 (loc, OPT_Wlong_long,
9522 "ISO C90 does not support %<long long%>");
9523 specs->long_long_p = 1;
9524 specs->locations[cdw_long_long] = loc;
9529 ("both %<long%> and %<short%> in "
9530 "declaration specifiers"));
9531 else if (specs->typespec_word == cts_auto_type)
9533 ("both %<long%> and %<__auto_type%> in "
9534 "declaration specifiers"));
9535 else if (specs->typespec_word == cts_void)
9537 ("both %<long%> and %<void%> in "
9538 "declaration specifiers"));
9539 else if (specs->typespec_word == cts_int_n)
9541 ("both %<long%> and %<__int%d%> in "
9542 "declaration specifiers"),
9543 int_n_data[specs->int_n_idx].bitsize);
9544 else if (specs->typespec_word == cts_bool)
9546 ("both %<long%> and %<_Bool%> in "
9547 "declaration specifiers"));
9548 else if (specs->typespec_word == cts_char)
9550 ("both %<long%> and %<char%> in "
9551 "declaration specifiers"));
9552 else if (specs->typespec_word == cts_float)
9554 ("both %<long%> and %<float%> in "
9555 "declaration specifiers"));
9556 else if (specs->typespec_word == cts_dfloat32)
9558 ("both %<long%> and %<_Decimal32%> in "
9559 "declaration specifiers"));
9560 else if (specs->typespec_word == cts_dfloat64)
9562 ("both %<long%> and %<_Decimal64%> in "
9563 "declaration specifiers"));
9564 else if (specs->typespec_word == cts_dfloat128)
9566 ("both %<long%> and %<_Decimal128%> in "
9567 "declaration specifiers"));
9570 specs->long_p = true;
9571 specs->locations[cdw_long] = loc;
9575 dupe = specs->short_p;
9578 ("both %<long%> and %<short%> in "
9579 "declaration specifiers"));
9580 else if (specs->typespec_word == cts_auto_type)
9582 ("both %<short%> and %<__auto_type%> in "
9583 "declaration specifiers"));
9584 else if (specs->typespec_word == cts_void)
9586 ("both %<short%> and %<void%> in "
9587 "declaration specifiers"));
9588 else if (specs->typespec_word == cts_int_n)
9590 ("both %<short%> and %<__int%d%> in "
9591 "declaration specifiers"),
9592 int_n_data[specs->int_n_idx].bitsize);
9593 else if (specs->typespec_word == cts_bool)
9595 ("both %<short%> and %<_Bool%> in "
9596 "declaration specifiers"));
9597 else if (specs->typespec_word == cts_char)
9599 ("both %<short%> and %<char%> in "
9600 "declaration specifiers"));
9601 else if (specs->typespec_word == cts_float)
9603 ("both %<short%> and %<float%> in "
9604 "declaration specifiers"));
9605 else if (specs->typespec_word == cts_double)
9607 ("both %<short%> and %<double%> in "
9608 "declaration specifiers"));
9609 else if (specs->typespec_word == cts_dfloat32)
9611 ("both %<short%> and %<_Decimal32%> in "
9612 "declaration specifiers"));
9613 else if (specs->typespec_word == cts_dfloat64)
9615 ("both %<short%> and %<_Decimal64%> in "
9616 "declaration specifiers"));
9617 else if (specs->typespec_word == cts_dfloat128)
9619 ("both %<short%> and %<_Decimal128%> in "
9620 "declaration specifiers"));
9623 specs->short_p = true;
9624 specs->locations[cdw_short] = loc;
9628 dupe = specs->signed_p;
9629 if (specs->unsigned_p)
9631 ("both %<signed%> and %<unsigned%> in "
9632 "declaration specifiers"));
9633 else if (specs->typespec_word == cts_auto_type)
9635 ("both %<signed%> and %<__auto_type%> in "
9636 "declaration specifiers"));
9637 else if (specs->typespec_word == cts_void)
9639 ("both %<signed%> and %<void%> in "
9640 "declaration specifiers"));
9641 else if (specs->typespec_word == cts_bool)
9643 ("both %<signed%> and %<_Bool%> in "
9644 "declaration specifiers"));
9645 else if (specs->typespec_word == cts_float)
9647 ("both %<signed%> and %<float%> in "
9648 "declaration specifiers"));
9649 else if (specs->typespec_word == cts_double)
9651 ("both %<signed%> and %<double%> in "
9652 "declaration specifiers"));
9653 else if (specs->typespec_word == cts_dfloat32)
9655 ("both %<signed%> and %<_Decimal32%> in "
9656 "declaration specifiers"));
9657 else if (specs->typespec_word == cts_dfloat64)
9659 ("both %<signed%> and %<_Decimal64%> in "
9660 "declaration specifiers"));
9661 else if (specs->typespec_word == cts_dfloat128)
9663 ("both %<signed%> and %<_Decimal128%> in "
9664 "declaration specifiers"));
9667 specs->signed_p = true;
9668 specs->locations[cdw_signed] = loc;
9672 dupe = specs->unsigned_p;
9673 if (specs->signed_p)
9675 ("both %<signed%> and %<unsigned%> in "
9676 "declaration specifiers"));
9677 else if (specs->typespec_word == cts_auto_type)
9679 ("both %<unsigned%> and %<__auto_type%> in "
9680 "declaration specifiers"));
9681 else if (specs->typespec_word == cts_void)
9683 ("both %<unsigned%> and %<void%> in "
9684 "declaration specifiers"));
9685 else if (specs->typespec_word == cts_bool)
9687 ("both %<unsigned%> and %<_Bool%> in "
9688 "declaration specifiers"));
9689 else if (specs->typespec_word == cts_float)
9691 ("both %<unsigned%> and %<float%> in "
9692 "declaration specifiers"));
9693 else if (specs->typespec_word == cts_double)
9695 ("both %<unsigned%> and %<double%> in "
9696 "declaration specifiers"));
9697 else if (specs->typespec_word == cts_dfloat32)
9699 ("both %<unsigned%> and %<_Decimal32%> in "
9700 "declaration specifiers"));
9701 else if (specs->typespec_word == cts_dfloat64)
9703 ("both %<unsigned%> and %<_Decimal64%> in "
9704 "declaration specifiers"));
9705 else if (specs->typespec_word == cts_dfloat128)
9707 ("both %<unsigned%> and %<_Decimal128%> in "
9708 "declaration specifiers"));
9711 specs->unsigned_p = true;
9712 specs->locations[cdw_unsigned] = loc;
9716 dupe = specs->complex_p;
9717 if (!in_system_header_at (loc))
9718 pedwarn_c90 (loc, OPT_Wpedantic,
9719 "ISO C90 does not support complex types");
9720 if (specs->typespec_word == cts_auto_type)
9722 ("both %<complex%> and %<__auto_type%> in "
9723 "declaration specifiers"));
9724 else if (specs->typespec_word == cts_void)
9726 ("both %<complex%> and %<void%> in "
9727 "declaration specifiers"));
9728 else if (specs->typespec_word == cts_bool)
9730 ("both %<complex%> and %<_Bool%> in "
9731 "declaration specifiers"));
9732 else if (specs->typespec_word == cts_dfloat32)
9734 ("both %<complex%> and %<_Decimal32%> in "
9735 "declaration specifiers"));
9736 else if (specs->typespec_word == cts_dfloat64)
9738 ("both %<complex%> and %<_Decimal64%> in "
9739 "declaration specifiers"));
9740 else if (specs->typespec_word == cts_dfloat128)
9742 ("both %<complex%> and %<_Decimal128%> in "
9743 "declaration specifiers"));
9744 else if (specs->typespec_word == cts_fract)
9746 ("both %<complex%> and %<_Fract%> in "
9747 "declaration specifiers"));
9748 else if (specs->typespec_word == cts_accum)
9750 ("both %<complex%> and %<_Accum%> in "
9751 "declaration specifiers"));
9752 else if (specs->saturating_p)
9754 ("both %<complex%> and %<_Sat%> in "
9755 "declaration specifiers"));
9758 specs->complex_p = true;
9759 specs->locations[cdw_complex] = loc;
9763 dupe = specs->saturating_p;
9764 pedwarn (loc, OPT_Wpedantic,
9765 "ISO C does not support saturating types");
9766 if (specs->typespec_word == cts_int_n)
9769 ("both %<_Sat%> and %<__int%d%> in "
9770 "declaration specifiers"),
9771 int_n_data[specs->int_n_idx].bitsize);
9773 else if (specs->typespec_word == cts_auto_type)
9775 ("both %<_Sat%> and %<__auto_type%> in "
9776 "declaration specifiers"));
9777 else if (specs->typespec_word == cts_void)
9779 ("both %<_Sat%> and %<void%> in "
9780 "declaration specifiers"));
9781 else if (specs->typespec_word == cts_bool)
9783 ("both %<_Sat%> and %<_Bool%> in "
9784 "declaration specifiers"));
9785 else if (specs->typespec_word == cts_char)
9787 ("both %<_Sat%> and %<char%> in "
9788 "declaration specifiers"));
9789 else if (specs->typespec_word == cts_int)
9791 ("both %<_Sat%> and %<int%> in "
9792 "declaration specifiers"));
9793 else if (specs->typespec_word == cts_float)
9795 ("both %<_Sat%> and %<float%> in "
9796 "declaration specifiers"));
9797 else if (specs->typespec_word == cts_double)
9799 ("both %<_Sat%> and %<double%> in "
9800 "declaration specifiers"));
9801 else if (specs->typespec_word == cts_dfloat32)
9803 ("both %<_Sat%> and %<_Decimal32%> in "
9804 "declaration specifiers"));
9805 else if (specs->typespec_word == cts_dfloat64)
9807 ("both %<_Sat%> and %<_Decimal64%> in "
9808 "declaration specifiers"));
9809 else if (specs->typespec_word == cts_dfloat128)
9811 ("both %<_Sat%> and %<_Decimal128%> in "
9812 "declaration specifiers"));
9813 else if (specs->complex_p)
9815 ("both %<_Sat%> and %<complex%> in "
9816 "declaration specifiers"));
9819 specs->saturating_p = true;
9820 specs->locations[cdw_saturating] = loc;
9828 error_at (loc, "duplicate %qE", type);
9834 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9835 "__intN", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9837 if (specs->typespec_word != cts_none)
9840 "two or more data types in declaration specifiers");
9848 ("both %<long%> and %<__auto_type%> in "
9849 "declaration specifiers"));
9850 else if (specs->short_p)
9852 ("both %<short%> and %<__auto_type%> in "
9853 "declaration specifiers"));
9854 else if (specs->signed_p)
9856 ("both %<signed%> and %<__auto_type%> in "
9857 "declaration specifiers"));
9858 else if (specs->unsigned_p)
9860 ("both %<unsigned%> and %<__auto_type%> in "
9861 "declaration specifiers"));
9862 else if (specs->complex_p)
9864 ("both %<complex%> and %<__auto_type%> in "
9865 "declaration specifiers"));
9866 else if (specs->saturating_p)
9868 ("both %<_Sat%> and %<__auto_type%> in "
9869 "declaration specifiers"));
9872 specs->typespec_word = cts_auto_type;
9873 specs->locations[cdw_typespec] = loc;
9880 specs->int_n_idx = i - RID_INT_N_0;
9881 if (!in_system_header_at (input_location))
9882 pedwarn (loc, OPT_Wpedantic,
9883 "ISO C does not support %<__int%d%> types",
9884 int_n_data[specs->int_n_idx].bitsize);
9888 ("both %<__int%d%> and %<long%> in "
9889 "declaration specifiers"),
9890 int_n_data[specs->int_n_idx].bitsize);
9891 else if (specs->saturating_p)
9893 ("both %<_Sat%> and %<__int%d%> in "
9894 "declaration specifiers"),
9895 int_n_data[specs->int_n_idx].bitsize);
9896 else if (specs->short_p)
9898 ("both %<__int%d%> and %<short%> in "
9899 "declaration specifiers"),
9900 int_n_data[specs->int_n_idx].bitsize);
9901 else if (! int_n_enabled_p [specs->int_n_idx])
9903 "%<__int%d%> is not supported on this target",
9904 int_n_data[specs->int_n_idx].bitsize);
9907 specs->typespec_word = cts_int_n;
9908 specs->locations[cdw_typespec] = loc;
9914 ("both %<long%> and %<void%> in "
9915 "declaration specifiers"));
9916 else if (specs->short_p)
9918 ("both %<short%> and %<void%> in "
9919 "declaration specifiers"));
9920 else if (specs->signed_p)
9922 ("both %<signed%> and %<void%> in "
9923 "declaration specifiers"));
9924 else if (specs->unsigned_p)
9926 ("both %<unsigned%> and %<void%> in "
9927 "declaration specifiers"));
9928 else if (specs->complex_p)
9930 ("both %<complex%> and %<void%> in "
9931 "declaration specifiers"));
9932 else if (specs->saturating_p)
9934 ("both %<_Sat%> and %<void%> in "
9935 "declaration specifiers"));
9938 specs->typespec_word = cts_void;
9939 specs->locations[cdw_typespec] = loc;
9943 if (!in_system_header_at (loc))
9944 pedwarn_c90 (loc, OPT_Wpedantic,
9945 "ISO C90 does not support boolean types");
9948 ("both %<long%> and %<_Bool%> in "
9949 "declaration specifiers"));
9950 else if (specs->short_p)
9952 ("both %<short%> and %<_Bool%> in "
9953 "declaration specifiers"));
9954 else if (specs->signed_p)
9956 ("both %<signed%> and %<_Bool%> in "
9957 "declaration specifiers"));
9958 else if (specs->unsigned_p)
9960 ("both %<unsigned%> and %<_Bool%> in "
9961 "declaration specifiers"));
9962 else if (specs->complex_p)
9964 ("both %<complex%> and %<_Bool%> in "
9965 "declaration specifiers"));
9966 else if (specs->saturating_p)
9968 ("both %<_Sat%> and %<_Bool%> in "
9969 "declaration specifiers"));
9972 specs->typespec_word = cts_bool;
9973 specs->locations[cdw_typespec] = loc;
9979 ("both %<long%> and %<char%> in "
9980 "declaration specifiers"));
9981 else if (specs->short_p)
9983 ("both %<short%> and %<char%> in "
9984 "declaration specifiers"));
9985 else if (specs->saturating_p)
9987 ("both %<_Sat%> and %<char%> in "
9988 "declaration specifiers"));
9991 specs->typespec_word = cts_char;
9992 specs->locations[cdw_typespec] = loc;
9996 if (specs->saturating_p)
9998 ("both %<_Sat%> and %<int%> in "
9999 "declaration specifiers"));
10002 specs->typespec_word = cts_int;
10003 specs->locations[cdw_typespec] = loc;
10009 ("both %<long%> and %<float%> in "
10010 "declaration specifiers"));
10011 else if (specs->short_p)
10013 ("both %<short%> and %<float%> in "
10014 "declaration specifiers"));
10015 else if (specs->signed_p)
10017 ("both %<signed%> and %<float%> in "
10018 "declaration specifiers"));
10019 else if (specs->unsigned_p)
10021 ("both %<unsigned%> and %<float%> in "
10022 "declaration specifiers"));
10023 else if (specs->saturating_p)
10025 ("both %<_Sat%> and %<float%> in "
10026 "declaration specifiers"));
10029 specs->typespec_word = cts_float;
10030 specs->locations[cdw_typespec] = loc;
10034 if (specs->long_long_p)
10036 ("both %<long long%> and %<double%> in "
10037 "declaration specifiers"));
10038 else if (specs->short_p)
10040 ("both %<short%> and %<double%> in "
10041 "declaration specifiers"));
10042 else if (specs->signed_p)
10044 ("both %<signed%> and %<double%> in "
10045 "declaration specifiers"));
10046 else if (specs->unsigned_p)
10048 ("both %<unsigned%> and %<double%> in "
10049 "declaration specifiers"));
10050 else if (specs->saturating_p)
10052 ("both %<_Sat%> and %<double%> in "
10053 "declaration specifiers"));
10056 specs->typespec_word = cts_double;
10057 specs->locations[cdw_typespec] = loc;
10062 case RID_DFLOAT128:
10065 if (i == RID_DFLOAT32)
10066 str = "_Decimal32";
10067 else if (i == RID_DFLOAT64)
10068 str = "_Decimal64";
10070 str = "_Decimal128";
10071 if (specs->long_long_p)
10073 ("both %<long long%> and %<%s%> in "
10074 "declaration specifiers"),
10078 ("both %<long%> and %<%s%> in "
10079 "declaration specifiers"),
10081 else if (specs->short_p)
10083 ("both %<short%> and %<%s%> in "
10084 "declaration specifiers"),
10086 else if (specs->signed_p)
10088 ("both %<signed%> and %<%s%> in "
10089 "declaration specifiers"),
10091 else if (specs->unsigned_p)
10093 ("both %<unsigned%> and %<%s%> in "
10094 "declaration specifiers"),
10096 else if (specs->complex_p)
10098 ("both %<complex%> and %<%s%> in "
10099 "declaration specifiers"),
10101 else if (specs->saturating_p)
10103 ("both %<_Sat%> and %<%s%> in "
10104 "declaration specifiers"),
10106 else if (i == RID_DFLOAT32)
10107 specs->typespec_word = cts_dfloat32;
10108 else if (i == RID_DFLOAT64)
10109 specs->typespec_word = cts_dfloat64;
10111 specs->typespec_word = cts_dfloat128;
10112 specs->locations[cdw_typespec] = loc;
10114 if (!targetm.decimal_float_supported_p ())
10116 ("decimal floating point not supported "
10117 "for this target"));
10118 pedwarn (loc, OPT_Wpedantic,
10119 "ISO C does not support decimal floating point");
10125 if (i == RID_FRACT)
10129 if (specs->complex_p)
10131 ("both %<complex%> and %<%s%> in "
10132 "declaration specifiers"),
10134 else if (i == RID_FRACT)
10135 specs->typespec_word = cts_fract;
10137 specs->typespec_word = cts_accum;
10138 specs->locations[cdw_typespec] = loc;
10140 if (!targetm.fixed_point_supported_p ())
10142 "fixed-point types not supported for this target");
10143 pedwarn (loc, OPT_Wpedantic,
10144 "ISO C does not support fixed-point types");
10147 /* ObjC reserved word "id", handled below. */
10153 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
10154 form of ObjC type, cases such as "int" and "long" being handled
10155 above), a TYPE (struct, union, enum and typeof specifiers) or an
10156 ERROR_MARK. In none of these cases may there have previously
10157 been any type specifiers. */
10158 if (specs->type || specs->typespec_word != cts_none
10159 || specs->long_p || specs->short_p || specs->signed_p
10160 || specs->unsigned_p || specs->complex_p)
10161 error_at (loc, "two or more data types in declaration specifiers");
10162 else if (TREE_CODE (type) == TYPE_DECL)
10164 if (TREE_TYPE (type) == error_mark_node)
10165 ; /* Allow the type to default to int to avoid cascading errors. */
10168 specs->type = TREE_TYPE (type);
10169 specs->decl_attr = DECL_ATTRIBUTES (type);
10170 specs->typedef_p = true;
10171 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
10172 specs->locations[cdw_typedef] = loc;
10174 /* If this typedef name is defined in a struct, then a C++
10175 lookup would return a different value. */
10176 if (warn_cxx_compat
10177 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
10178 warning_at (loc, OPT_Wc___compat,
10179 "C++ lookup of %qD would return a field, not a type",
10182 /* If we are parsing a struct, record that a struct field
10184 if (warn_cxx_compat && struct_parse_info != NULL)
10185 struct_parse_info->typedefs_seen.safe_push (type);
10188 else if (TREE_CODE (type) == IDENTIFIER_NODE)
10190 tree t = lookup_name (type);
10191 if (!t || TREE_CODE (t) != TYPE_DECL)
10192 error_at (loc, "%qE fails to be a typedef or built in type", type);
10193 else if (TREE_TYPE (t) == error_mark_node)
10197 specs->type = TREE_TYPE (t);
10198 specs->locations[cdw_typespec] = loc;
10203 if (TREE_CODE (type) != ERROR_MARK && spec.kind == ctsk_typeof)
10205 specs->typedef_p = true;
10206 specs->locations[cdw_typedef] = loc;
10210 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
10211 specs->expr, spec.expr);
10213 specs->expr = spec.expr;
10214 specs->expr_const_operands &= spec.expr_const_operands;
10217 specs->type = type;
10223 /* Add the storage class specifier or function specifier SCSPEC to the
10224 declaration specifiers SPECS, returning SPECS. */
10226 struct c_declspecs *
10227 declspecs_add_scspec (source_location loc,
10228 struct c_declspecs *specs,
10232 enum c_storage_class n = csc_none;
10234 specs->declspecs_seen_p = true;
10235 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
10236 && C_IS_RESERVED_WORD (scspec));
10237 i = C_RID_CODE (scspec);
10238 if (specs->non_sc_seen_p)
10239 warning (OPT_Wold_style_declaration,
10240 "%qE is not at beginning of declaration", scspec);
10244 /* C99 permits duplicate inline. Although of doubtful utility,
10245 it seems simplest to permit it in gnu89 mode as well, as
10246 there is also little utility in maintaining this as a
10247 difference between gnu89 and C99 inline. */
10249 specs->inline_p = true;
10250 specs->locations[cdw_inline] = loc;
10253 /* Duplicate _Noreturn is permitted. */
10255 specs->noreturn_p = true;
10256 specs->locations[cdw_noreturn] = loc;
10259 dupe = specs->thread_p;
10260 if (specs->storage_class == csc_auto)
10261 error ("%qE used with %<auto%>", scspec);
10262 else if (specs->storage_class == csc_register)
10263 error ("%qE used with %<register%>", scspec);
10264 else if (specs->storage_class == csc_typedef)
10265 error ("%qE used with %<typedef%>", scspec);
10268 specs->thread_p = true;
10269 specs->thread_gnu_p = (strcmp (IDENTIFIER_POINTER (scspec),
10271 /* A diagnostic is not required for the use of this
10272 identifier in the implementation namespace; only diagnose
10273 it for the C11 spelling because of existing code using
10274 the other spelling. */
10275 if (!specs->thread_gnu_p)
10278 pedwarn_c99 (loc, OPT_Wpedantic,
10279 "ISO C99 does not support %qE", scspec);
10281 pedwarn_c99 (loc, OPT_Wpedantic,
10282 "ISO C90 does not support %qE", scspec);
10284 specs->locations[cdw_thread] = loc;
10292 /* Diagnose "__thread extern". */
10293 if (specs->thread_p && specs->thread_gnu_p)
10294 error ("%<__thread%> before %<extern%>");
10301 /* Diagnose "__thread static". */
10302 if (specs->thread_p && specs->thread_gnu_p)
10303 error ("%<__thread%> before %<static%>");
10309 gcc_unreachable ();
10311 if (n != csc_none && n == specs->storage_class)
10315 if (i == RID_THREAD)
10316 error ("duplicate %<_Thread_local%> or %<__thread%>");
10318 error ("duplicate %qE", scspec);
10322 if (specs->storage_class != csc_none && n != specs->storage_class)
10324 error ("multiple storage classes in declaration specifiers");
10328 specs->storage_class = n;
10329 specs->locations[cdw_storage_class] = loc;
10330 if (n != csc_extern && n != csc_static && specs->thread_p)
10332 error ("%qs used with %qE",
10333 specs->thread_gnu_p ? "__thread" : "_Thread_local",
10335 specs->thread_p = false;
10342 /* Add the attributes ATTRS to the declaration specifiers SPECS,
10343 returning SPECS. */
10345 struct c_declspecs *
10346 declspecs_add_attrs (source_location loc, struct c_declspecs *specs, tree attrs)
10348 specs->attrs = chainon (attrs, specs->attrs);
10349 specs->locations[cdw_attributes] = loc;
10350 specs->declspecs_seen_p = true;
10354 /* Add an _Alignas specifier (expression ALIGN, or type whose
10355 alignment is ALIGN) to the declaration specifiers SPECS, returning
10357 struct c_declspecs *
10358 declspecs_add_alignas (source_location loc,
10359 struct c_declspecs *specs, tree align)
10362 specs->alignas_p = true;
10363 specs->locations[cdw_alignas] = loc;
10364 if (align == error_mark_node)
10366 align_log = check_user_alignment (align, true);
10367 if (align_log > specs->align_log)
10368 specs->align_log = align_log;
10372 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10373 specifiers with any other type specifier to determine the resulting
10374 type. This is where ISO C checks on complex types are made, since
10375 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10378 struct c_declspecs *
10379 finish_declspecs (struct c_declspecs *specs)
10381 /* If a type was specified as a whole, we have no modifiers and are
10383 if (specs->type != NULL_TREE)
10385 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
10386 && !specs->signed_p && !specs->unsigned_p
10387 && !specs->complex_p);
10389 /* Set a dummy type. */
10390 if (TREE_CODE (specs->type) == ERROR_MARK)
10391 specs->type = integer_type_node;
10395 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10396 has been specified, treat it as "int" unless "_Complex" is
10397 present and there are no other specifiers. If we just have
10398 "_Complex", it is equivalent to "_Complex double", but e.g.
10399 "_Complex short" is equivalent to "_Complex short int". */
10400 if (specs->typespec_word == cts_none)
10402 if (specs->saturating_p)
10404 error_at (specs->locations[cdw_saturating],
10405 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10406 if (!targetm.fixed_point_supported_p ())
10407 error_at (specs->locations[cdw_saturating],
10408 "fixed-point types not supported for this target");
10409 specs->typespec_word = cts_fract;
10411 else if (specs->long_p || specs->short_p
10412 || specs->signed_p || specs->unsigned_p)
10414 specs->typespec_word = cts_int;
10416 else if (specs->complex_p)
10418 specs->typespec_word = cts_double;
10419 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10420 "ISO C does not support plain %<complex%> meaning "
10421 "%<double complex%>");
10425 specs->typespec_word = cts_int;
10426 specs->default_int_p = true;
10427 /* We don't diagnose this here because grokdeclarator will
10428 give more specific diagnostics according to whether it is
10429 a function definition. */
10433 /* If "signed" was specified, record this to distinguish "int" and
10434 "signed int" in the case of a bit-field with
10435 -funsigned-bitfields. */
10436 specs->explicit_signed_p = specs->signed_p;
10438 /* Now compute the actual type. */
10439 switch (specs->typespec_word)
10441 case cts_auto_type:
10442 gcc_assert (!specs->long_p && !specs->short_p
10443 && !specs->signed_p && !specs->unsigned_p
10444 && !specs->complex_p);
10445 /* Type to be filled in later. */
10448 gcc_assert (!specs->long_p && !specs->short_p
10449 && !specs->signed_p && !specs->unsigned_p
10450 && !specs->complex_p);
10451 specs->type = void_type_node;
10454 gcc_assert (!specs->long_p && !specs->short_p
10455 && !specs->signed_p && !specs->unsigned_p
10456 && !specs->complex_p);
10457 specs->type = boolean_type_node;
10460 gcc_assert (!specs->long_p && !specs->short_p);
10461 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10462 if (specs->signed_p)
10463 specs->type = signed_char_type_node;
10464 else if (specs->unsigned_p)
10465 specs->type = unsigned_char_type_node;
10467 specs->type = char_type_node;
10468 if (specs->complex_p)
10470 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10471 "ISO C does not support complex integer types");
10472 specs->type = build_complex_type (specs->type);
10476 gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p);
10477 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10478 specs->type = (specs->unsigned_p
10479 ? int_n_trees[specs->int_n_idx].unsigned_type
10480 : int_n_trees[specs->int_n_idx].signed_type);
10481 if (specs->complex_p)
10483 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10484 "ISO C does not support complex integer types");
10485 specs->type = build_complex_type (specs->type);
10489 gcc_assert (!(specs->long_p && specs->short_p));
10490 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10491 if (specs->long_long_p)
10492 specs->type = (specs->unsigned_p
10493 ? long_long_unsigned_type_node
10494 : long_long_integer_type_node);
10495 else if (specs->long_p)
10496 specs->type = (specs->unsigned_p
10497 ? long_unsigned_type_node
10498 : long_integer_type_node);
10499 else if (specs->short_p)
10500 specs->type = (specs->unsigned_p
10501 ? short_unsigned_type_node
10502 : short_integer_type_node);
10504 specs->type = (specs->unsigned_p
10505 ? unsigned_type_node
10506 : integer_type_node);
10507 if (specs->complex_p)
10509 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10510 "ISO C does not support complex integer types");
10511 specs->type = build_complex_type (specs->type);
10515 gcc_assert (!specs->long_p && !specs->short_p
10516 && !specs->signed_p && !specs->unsigned_p);
10517 specs->type = (specs->complex_p
10518 ? complex_float_type_node
10519 : float_type_node);
10522 gcc_assert (!specs->long_long_p && !specs->short_p
10523 && !specs->signed_p && !specs->unsigned_p);
10526 specs->type = (specs->complex_p
10527 ? complex_long_double_type_node
10528 : long_double_type_node);
10532 specs->type = (specs->complex_p
10533 ? complex_double_type_node
10534 : double_type_node);
10539 case cts_dfloat128:
10540 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
10541 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
10542 if (specs->typespec_word == cts_dfloat32)
10543 specs->type = dfloat32_type_node;
10544 else if (specs->typespec_word == cts_dfloat64)
10545 specs->type = dfloat64_type_node;
10547 specs->type = dfloat128_type_node;
10550 gcc_assert (!specs->complex_p);
10551 if (!targetm.fixed_point_supported_p ())
10552 specs->type = integer_type_node;
10553 else if (specs->saturating_p)
10555 if (specs->long_long_p)
10556 specs->type = specs->unsigned_p
10557 ? sat_unsigned_long_long_fract_type_node
10558 : sat_long_long_fract_type_node;
10559 else if (specs->long_p)
10560 specs->type = specs->unsigned_p
10561 ? sat_unsigned_long_fract_type_node
10562 : sat_long_fract_type_node;
10563 else if (specs->short_p)
10564 specs->type = specs->unsigned_p
10565 ? sat_unsigned_short_fract_type_node
10566 : sat_short_fract_type_node;
10568 specs->type = specs->unsigned_p
10569 ? sat_unsigned_fract_type_node
10570 : sat_fract_type_node;
10574 if (specs->long_long_p)
10575 specs->type = specs->unsigned_p
10576 ? unsigned_long_long_fract_type_node
10577 : long_long_fract_type_node;
10578 else if (specs->long_p)
10579 specs->type = specs->unsigned_p
10580 ? unsigned_long_fract_type_node
10581 : long_fract_type_node;
10582 else if (specs->short_p)
10583 specs->type = specs->unsigned_p
10584 ? unsigned_short_fract_type_node
10585 : short_fract_type_node;
10587 specs->type = specs->unsigned_p
10588 ? unsigned_fract_type_node
10593 gcc_assert (!specs->complex_p);
10594 if (!targetm.fixed_point_supported_p ())
10595 specs->type = integer_type_node;
10596 else if (specs->saturating_p)
10598 if (specs->long_long_p)
10599 specs->type = specs->unsigned_p
10600 ? sat_unsigned_long_long_accum_type_node
10601 : sat_long_long_accum_type_node;
10602 else if (specs->long_p)
10603 specs->type = specs->unsigned_p
10604 ? sat_unsigned_long_accum_type_node
10605 : sat_long_accum_type_node;
10606 else if (specs->short_p)
10607 specs->type = specs->unsigned_p
10608 ? sat_unsigned_short_accum_type_node
10609 : sat_short_accum_type_node;
10611 specs->type = specs->unsigned_p
10612 ? sat_unsigned_accum_type_node
10613 : sat_accum_type_node;
10617 if (specs->long_long_p)
10618 specs->type = specs->unsigned_p
10619 ? unsigned_long_long_accum_type_node
10620 : long_long_accum_type_node;
10621 else if (specs->long_p)
10622 specs->type = specs->unsigned_p
10623 ? unsigned_long_accum_type_node
10624 : long_accum_type_node;
10625 else if (specs->short_p)
10626 specs->type = specs->unsigned_p
10627 ? unsigned_short_accum_type_node
10628 : short_accum_type_node;
10630 specs->type = specs->unsigned_p
10631 ? unsigned_accum_type_node
10636 gcc_unreachable ();
10642 /* A subroutine of c_write_global_declarations. Perform final processing
10643 on one file scope's declarations (or the external scope's declarations),
10647 c_write_global_declarations_1 (tree globals)
10652 /* Process the decls in the order they were written. */
10653 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10655 /* Check for used but undefined static functions using the C
10656 standard's definition of "used", and set TREE_NO_WARNING so
10657 that check_global_declarations doesn't repeat the check. */
10658 if (TREE_CODE (decl) == FUNCTION_DECL
10659 && DECL_INITIAL (decl) == 0
10660 && DECL_EXTERNAL (decl)
10661 && !TREE_PUBLIC (decl)
10662 && C_DECL_USED (decl))
10664 pedwarn (input_location, 0, "%q+F used but never defined", decl);
10665 TREE_NO_WARNING (decl) = 1;
10668 wrapup_global_declaration_1 (decl);
10673 reconsider = false;
10674 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10675 reconsider |= wrapup_global_declaration_2 (decl);
10677 while (reconsider);
10679 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10680 check_global_declaration_1 (decl);
10683 /* A subroutine of c_write_global_declarations Emit debug information for each
10684 of the declarations in GLOBALS. */
10687 c_write_global_declarations_2 (tree globals)
10691 for (decl = globals; decl ; decl = DECL_CHAIN (decl))
10692 debug_hooks->global_decl (decl);
10695 /* Callback to collect a source_ref from a DECL. */
10698 collect_source_ref_cb (tree decl)
10700 if (!DECL_IS_BUILTIN (decl))
10701 collect_source_ref (LOCATION_FILE (decl_sloc (decl, false)));
10704 /* Preserve the external declarations scope across a garbage collect. */
10705 static GTY(()) tree ext_block;
10707 /* Collect all references relevant to SOURCE_FILE. */
10710 collect_all_refs (const char *source_file)
10715 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10716 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file);
10718 collect_ada_nodes (BLOCK_VARS (ext_block), source_file);
10721 /* Iterate over all global declarations and call CALLBACK. */
10724 for_each_global_decl (void (*callback) (tree decl))
10731 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10733 decls = DECL_INITIAL (t);
10734 for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl))
10738 for (decl = BLOCK_VARS (ext_block); decl; decl = TREE_CHAIN (decl))
10743 c_write_global_declarations (void)
10748 /* We don't want to do this if generating a PCH. */
10752 timevar_start (TV_PHASE_DEFERRED);
10754 /* Do the Objective-C stuff. This is where all the Objective-C
10755 module stuff gets generated (symtab, class/protocol/selector
10757 if (c_dialect_objc ())
10758 objc_write_global_declarations ();
10760 /* Close the external scope. */
10761 ext_block = pop_scope ();
10762 external_scope = 0;
10763 gcc_assert (!current_scope);
10765 /* Handle -fdump-ada-spec[-slim]. */
10766 if (flag_dump_ada_spec || flag_dump_ada_spec_slim)
10768 /* Build a table of files to generate specs for */
10769 if (flag_dump_ada_spec_slim)
10770 collect_source_ref (main_input_filename);
10772 for_each_global_decl (collect_source_ref_cb);
10774 dump_ada_specs (collect_all_refs, NULL);
10779 tree tmp = BLOCK_VARS (ext_block);
10781 FILE * stream = dump_begin (TDI_tu, &flags);
10784 dump_node (tmp, flags & ~TDF_SLIM, stream);
10785 dump_end (TDI_tu, stream);
10789 /* Process all file scopes in this compilation, and the external_scope,
10790 through wrapup_global_declarations and check_global_declarations. */
10791 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10792 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
10793 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
10795 timevar_stop (TV_PHASE_DEFERRED);
10796 timevar_start (TV_PHASE_OPT_GEN);
10798 /* We're done parsing; proceed to optimize and emit assembly.
10799 FIXME: shouldn't be the front end's responsibility to call this. */
10800 symtab->finalize_compilation_unit ();
10802 timevar_stop (TV_PHASE_OPT_GEN);
10803 timevar_start (TV_PHASE_DBGINFO);
10805 /* After cgraph has had a chance to emit everything that's going to
10806 be emitted, output debug information for globals. */
10807 if (!seen_error ())
10809 timevar_push (TV_SYMOUT);
10810 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10811 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
10812 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
10813 timevar_pop (TV_SYMOUT);
10817 timevar_stop (TV_PHASE_DBGINFO);
10820 /* Register reserved keyword WORD as qualifier for address space AS. */
10823 c_register_addr_space (const char *word, addr_space_t as)
10825 int rid = RID_FIRST_ADDR_SPACE + as;
10828 /* Address space qualifiers are only supported
10829 in C with GNU extensions enabled. */
10830 if (c_dialect_objc () || flag_no_asm)
10833 id = get_identifier (word);
10834 C_SET_RID_CODE (id, rid);
10835 C_IS_RESERVED_WORD (id) = 1;
10836 ridpointers [rid] = id;
10839 /* Return identifier to look up for omp declare reduction. */
10842 c_omp_reduction_id (enum tree_code reduction_code, tree reduction_id)
10844 const char *p = NULL;
10845 switch (reduction_code)
10847 case PLUS_EXPR: p = "+"; break;
10848 case MULT_EXPR: p = "*"; break;
10849 case MINUS_EXPR: p = "-"; break;
10850 case BIT_AND_EXPR: p = "&"; break;
10851 case BIT_XOR_EXPR: p = "^"; break;
10852 case BIT_IOR_EXPR: p = "|"; break;
10853 case TRUTH_ANDIF_EXPR: p = "&&"; break;
10854 case TRUTH_ORIF_EXPR: p = "||"; break;
10855 case MIN_EXPR: p = "min"; break;
10856 case MAX_EXPR: p = "max"; break;
10863 if (TREE_CODE (reduction_id) != IDENTIFIER_NODE)
10864 return error_mark_node;
10865 p = IDENTIFIER_POINTER (reduction_id);
10868 const char prefix[] = "omp declare reduction ";
10869 size_t lenp = sizeof (prefix);
10870 size_t len = strlen (p);
10871 char *name = XALLOCAVEC (char, lenp + len);
10872 memcpy (name, prefix, lenp - 1);
10873 memcpy (name + lenp - 1, p, len + 1);
10874 return get_identifier (name);
10877 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10878 VAR_DECL, bind it into the current scope and return it. */
10881 c_omp_reduction_decl (tree reduction_id)
10883 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
10884 if (b != NULL && B_IN_CURRENT_SCOPE (b))
10887 tree decl = build_decl (BUILTINS_LOCATION, VAR_DECL,
10888 reduction_id, integer_type_node);
10889 DECL_ARTIFICIAL (decl) = 1;
10890 DECL_EXTERNAL (decl) = 1;
10891 TREE_STATIC (decl) = 1;
10892 TREE_PUBLIC (decl) = 0;
10893 bind (reduction_id, decl, current_scope, true, false, BUILTINS_LOCATION);
10897 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10900 c_omp_reduction_lookup (tree reduction_id, tree type)
10902 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
10906 for (t = DECL_INITIAL (b->decl); t; t = TREE_CHAIN (t))
10907 if (comptypes (TREE_PURPOSE (t), type))
10908 return TREE_VALUE (t);
10911 return error_mark_node;
10914 /* Helper function called via walk_tree, to diagnose invalid
10915 #pragma omp declare reduction combiners or initializers. */
10918 c_check_omp_declare_reduction_r (tree *tp, int *, void *data)
10920 tree *vars = (tree *) data;
10921 if (SSA_VAR_P (*tp)
10922 && !DECL_ARTIFICIAL (*tp)
10926 location_t loc = DECL_SOURCE_LOCATION (vars[0]);
10927 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars[0])), "omp_out") == 0)
10928 error_at (loc, "%<#pragma omp declare reduction%> combiner refers to "
10929 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10932 error_at (loc, "%<#pragma omp declare reduction%> initializer refers "
10933 "to variable %qD which is not %<omp_priv%> nor "
10941 #include "gt-c-c-decl.h"