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"
33 #include "c-family/c-common.h"
37 #include "stringpool.h"
40 #include "print-tree.h"
41 #include "stor-layout.h"
44 #include "tree-inline.h"
49 #include "c-family/c-objc.h"
50 #include "c-family/c-pragma.h"
51 #include "c-family/c-ubsan.h"
53 #include "langhooks.h"
54 #include "tree-iterator.h"
56 #include "langhooks-def.h"
58 #include "c-family/c-ada-spec.h"
62 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
64 { NORMAL, /* Ordinary declaration */
65 FUNCDEF, /* Function definition */
66 PARM, /* Declaration of parm before function body */
67 FIELD, /* Declaration inside struct or union */
68 TYPENAME}; /* Typename (inside cast or sizeof) */
70 /* States indicating how grokdeclarator() should handle declspecs marked
71 with __attribute__((deprecated)). An object declared as
72 __attribute__((deprecated)) suppresses warnings of uses of other
75 enum deprecated_states {
81 /* Nonzero if we have seen an invalid cross reference
82 to a struct, union, or enum, but not yet printed the message. */
83 tree pending_invalid_xref;
85 /* File and line to appear in the eventual error message. */
86 location_t pending_invalid_xref_location;
88 /* The file and line that the prototype came from if this is an
89 old-style definition; used for diagnostics in
90 store_parm_decls_oldstyle. */
92 static location_t current_function_prototype_locus;
94 /* Whether this prototype was built-in. */
96 static bool current_function_prototype_built_in;
98 /* The argument type information of this prototype. */
100 static tree current_function_prototype_arg_types;
102 /* The argument information structure for the function currently being
105 static struct c_arg_info *current_function_arg_info;
107 /* The obstack on which parser and related data structures, which are
108 not live beyond their top-level declaration or definition, are
110 struct obstack parser_obstack;
112 /* The current statement tree. */
114 static GTY(()) struct stmt_tree_s c_stmt_tree;
116 /* State saving variables. */
120 /* A list of decls to be made automatically visible in each file scope. */
121 static GTY(()) tree visible_builtins;
123 /* Set to 0 at beginning of a function definition, set to 1 if
124 a return statement that specifies a return value is seen. */
126 int current_function_returns_value;
128 /* Set to 0 at beginning of a function definition, set to 1 if
129 a return statement with no argument is seen. */
131 int current_function_returns_null;
133 /* Set to 0 at beginning of a function definition, set to 1 if
134 a call to a noreturn function is seen. */
136 int current_function_returns_abnormally;
138 /* Set to nonzero by `grokdeclarator' for a function
139 whose return type is defaulted, if warnings for this are desired. */
141 static int warn_about_return_type;
143 /* Nonzero when the current toplevel function contains a declaration
144 of a nested function which is never defined. */
146 static bool undef_nested_function;
148 /* If non-zero, implicit "omp declare target" attribute is added into the
150 int current_omp_declare_target_attribute;
152 /* Each c_binding structure describes one binding of an identifier to
153 a decl. All the decls in a scope - irrespective of namespace - are
154 chained together by the ->prev field, which (as the name implies)
155 runs in reverse order. All the decls in a given namespace bound to
156 a given identifier are chained by the ->shadowed field, which runs
157 from inner to outer scopes.
159 The ->decl field usually points to a DECL node, but there are two
160 exceptions. In the namespace of type tags, the bound entity is a
161 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
162 identifier is encountered, it is bound to error_mark_node to
163 suppress further errors about that identifier in the current
166 The ->u.type field stores the type of the declaration in this scope;
167 if NULL, the type is the type of the ->decl field. This is only of
168 relevance for objects with external or internal linkage which may
169 be redeclared in inner scopes, forming composite types that only
170 persist for the duration of those scopes. In the external scope,
171 this stores the composite of all the types declared for this
172 object, visible or not. The ->inner_comp field (used only at file
173 scope) stores whether an incomplete array type at file scope was
174 completed at an inner scope to an array size other than 1.
176 The ->u.label field is used for labels. It points to a structure
177 which stores additional information used for warnings.
179 The depth field is copied from the scope structure that holds this
180 decl. It is used to preserve the proper ordering of the ->shadowed
181 field (see bind()) and also for a handful of special-case checks.
182 Finally, the invisible bit is true for a decl which should be
183 ignored for purposes of normal name lookup, and the nested bit is
184 true for a decl that's been bound a second time in an inner scope;
185 in all such cases, the binding in the outer scope will have its
186 invisible bit true. */
188 struct GTY((chain_next ("%h.prev"))) c_binding {
189 union GTY(()) { /* first so GTY desc can use decl */
190 tree GTY((tag ("0"))) type; /* the type in this scope */
191 struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */
192 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u;
193 tree decl; /* the decl bound */
194 tree id; /* the identifier it's bound to */
195 struct c_binding *prev; /* the previous decl in this scope */
196 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
197 unsigned int depth : 28; /* depth of this scope */
198 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
199 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
200 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
201 BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */
202 location_t locus; /* location for nested bindings */
204 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
205 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
206 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
207 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
209 /* Each C symbol points to three linked lists of c_binding structures.
210 These describe the values of the identifier in the three different
211 namespaces defined by the language. */
213 struct GTY(()) lang_identifier {
214 struct c_common_identifier common_id;
215 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
216 struct c_binding *tag_binding; /* struct/union/enum tags */
217 struct c_binding *label_binding; /* labels */
220 /* Validate c-lang.c's assumptions. */
221 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
222 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
224 /* The binding oracle; see c-tree.h. */
225 void (*c_binding_oracle) (enum c_oracle_request, tree identifier);
227 /* This flag is set on an identifier if we have previously asked the
228 binding oracle for this identifier's symbol binding. */
229 #define I_SYMBOL_CHECKED(node) \
230 (TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (node)))
232 static inline struct c_binding* *
233 i_symbol_binding (tree node)
235 struct lang_identifier *lid
236 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
238 if (lid->symbol_binding == NULL
239 && c_binding_oracle != NULL
240 && !I_SYMBOL_CHECKED (node))
242 /* Set the "checked" flag first, to avoid infinite recursion
243 when the binding oracle calls back into gcc. */
244 I_SYMBOL_CHECKED (node) = 1;
245 c_binding_oracle (C_ORACLE_SYMBOL, node);
248 return &lid->symbol_binding;
251 #define I_SYMBOL_BINDING(node) (*i_symbol_binding (node))
253 #define I_SYMBOL_DECL(node) \
254 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
256 /* This flag is set on an identifier if we have previously asked the
257 binding oracle for this identifier's tag binding. */
258 #define I_TAG_CHECKED(node) \
259 (TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (node)))
261 static inline struct c_binding **
262 i_tag_binding (tree node)
264 struct lang_identifier *lid
265 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
267 if (lid->tag_binding == NULL
268 && c_binding_oracle != NULL
269 && !I_TAG_CHECKED (node))
271 /* Set the "checked" flag first, to avoid infinite recursion
272 when the binding oracle calls back into gcc. */
273 I_TAG_CHECKED (node) = 1;
274 c_binding_oracle (C_ORACLE_TAG, node);
277 return &lid->tag_binding;
280 #define I_TAG_BINDING(node) (*i_tag_binding (node))
282 #define I_TAG_DECL(node) \
283 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
285 /* This flag is set on an identifier if we have previously asked the
286 binding oracle for this identifier's label binding. */
287 #define I_LABEL_CHECKED(node) \
288 (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (node)))
290 static inline struct c_binding **
291 i_label_binding (tree node)
293 struct lang_identifier *lid
294 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
296 if (lid->label_binding == NULL
297 && c_binding_oracle != NULL
298 && !I_LABEL_CHECKED (node))
300 /* Set the "checked" flag first, to avoid infinite recursion
301 when the binding oracle calls back into gcc. */
302 I_LABEL_CHECKED (node) = 1;
303 c_binding_oracle (C_ORACLE_LABEL, node);
306 return &lid->label_binding;
309 #define I_LABEL_BINDING(node) (*i_label_binding (node))
311 #define I_LABEL_DECL(node) \
312 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
314 /* The resulting tree type. */
316 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
317 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
319 union tree_node GTY ((tag ("0"),
320 desc ("tree_node_structure (&%h)")))
322 struct lang_identifier GTY ((tag ("1"))) identifier;
325 /* Track bindings and other things that matter for goto warnings. For
326 efficiency, we do not gather all the decls at the point of
327 definition. Instead, we point into the bindings structure. As
328 scopes are popped, we update these structures and gather the decls
329 that matter at that time. */
331 struct GTY(()) c_spot_bindings {
332 /* The currently open scope which holds bindings defined when the
333 label was defined or the goto statement was found. */
334 struct c_scope *scope;
335 /* The bindings in the scope field which were defined at the point
336 of the label or goto. This lets us look at older or newer
337 bindings in the scope, as appropriate. */
338 struct c_binding *bindings_in_scope;
339 /* The number of statement expressions that have started since this
340 label or goto statement was defined. This is zero if we are at
341 the same statement expression level. It is positive if we are in
342 a statement expression started since this spot. It is negative
343 if this spot was in a statement expression and we have left
346 /* Whether we started in a statement expression but are no longer in
347 it. This is set to true if stmt_exprs ever goes negative. */
351 /* This structure is used to keep track of bindings seen when a goto
352 statement is defined. This is only used if we see the goto
353 statement before we see the label. */
355 struct GTY(()) c_goto_bindings {
356 /* The location of the goto statement. */
358 /* The bindings of the goto statement. */
359 struct c_spot_bindings goto_bindings;
362 typedef struct c_goto_bindings *c_goto_bindings_p;
364 /* The additional information we keep track of for a label binding.
365 These fields are updated as scopes are popped. */
367 struct GTY(()) c_label_vars {
368 /* The shadowed c_label_vars, when one label shadows another (which
369 can only happen using a __label__ declaration). */
370 struct c_label_vars *shadowed;
371 /* The bindings when the label was defined. */
372 struct c_spot_bindings label_bindings;
373 /* A list of decls that we care about: decls about which we should
374 warn if a goto branches to this label from later in the function.
375 Decls are added to this list as scopes are popped. We only add
376 the decls that matter. */
377 vec<tree, va_gc> *decls_in_scope;
378 /* A list of goto statements to this label. This is only used for
379 goto statements seen before the label was defined, so that we can
380 issue appropriate warnings for them. */
381 vec<c_goto_bindings_p, va_gc> *gotos;
384 /* Each c_scope structure describes the complete contents of one
385 scope. Four scopes are distinguished specially: the innermost or
386 current scope, the innermost function scope, the file scope (always
387 the second to outermost) and the outermost or external scope.
389 Most declarations are recorded in the current scope.
391 All normal label declarations are recorded in the innermost
392 function scope, as are bindings of undeclared identifiers to
393 error_mark_node. (GCC permits nested functions as an extension,
394 hence the 'innermost' qualifier.) Explicitly declared labels
395 (using the __label__ extension) appear in the current scope.
397 Being in the file scope (current_scope == file_scope) causes
398 special behavior in several places below. Also, under some
399 conditions the Objective-C front end records declarations in the
400 file scope even though that isn't the current scope.
402 All declarations with external linkage are recorded in the external
403 scope, even if they aren't visible there; this models the fact that
404 such declarations are visible to the entire program, and (with a
405 bit of cleverness, see pushdecl) allows diagnosis of some violations
406 of C99 6.2.2p7 and 6.2.7p2:
408 If, within the same translation unit, the same identifier appears
409 with both internal and external linkage, the behavior is
412 All declarations that refer to the same object or function shall
413 have compatible type; otherwise, the behavior is undefined.
415 Initially only the built-in declarations, which describe compiler
416 intrinsic functions plus a subset of the standard library, are in
419 The order of the blocks list matters, and it is frequently appended
420 to. To avoid having to walk all the way to the end of the list on
421 each insertion, or reverse the list later, we maintain a pointer to
422 the last list entry. (FIXME: It should be feasible to use a reversed
425 The bindings list is strictly in reverse order of declarations;
426 pop_scope relies on this. */
429 struct GTY((chain_next ("%h.outer"))) c_scope {
430 /* The scope containing this one. */
431 struct c_scope *outer;
433 /* The next outermost function scope. */
434 struct c_scope *outer_function;
436 /* All bindings in this scope. */
437 struct c_binding *bindings;
439 /* For each scope (except the global one), a chain of BLOCK nodes
440 for all the scopes that were entered and exited one level down. */
444 /* The depth of this scope. Used to keep the ->shadowed chain of
445 bindings sorted innermost to outermost. */
446 unsigned int depth : 28;
448 /* True if we are currently filling this scope with parameter
450 BOOL_BITFIELD parm_flag : 1;
452 /* True if we saw [*] in this scope. Used to give an error messages
453 if these appears in a function definition. */
454 BOOL_BITFIELD had_vla_unspec : 1;
456 /* True if we already complained about forward parameter decls
457 in this scope. This prevents double warnings on
458 foo (int a; int b; ...) */
459 BOOL_BITFIELD warned_forward_parm_decls : 1;
461 /* True if this is the outermost block scope of a function body.
462 This scope contains the parameters, the local variables declared
463 in the outermost block, and all the labels (except those in
464 nested functions, or declared at block scope with __label__). */
465 BOOL_BITFIELD function_body : 1;
467 /* True means make a BLOCK for this scope no matter what. */
468 BOOL_BITFIELD keep : 1;
470 /* True means that an unsuffixed float constant is _Decimal64. */
471 BOOL_BITFIELD float_const_decimal64 : 1;
473 /* True if this scope has any label bindings. This is used to speed
474 up searching for labels when popping scopes, particularly since
475 labels are normally only found at function scope. */
476 BOOL_BITFIELD has_label_bindings : 1;
478 /* True if we should issue a warning if a goto statement crosses any
479 of the bindings. We still need to check the list of bindings to
480 find the specific ones we need to warn about. This is true if
481 decl_jump_unsafe would return true for any of the bindings. This
482 is used to avoid looping over all the bindings unnecessarily. */
483 BOOL_BITFIELD has_jump_unsafe_decl : 1;
486 /* The scope currently in effect. */
488 static GTY(()) struct c_scope *current_scope;
490 /* The innermost function scope. Ordinary (not explicitly declared)
491 labels, bindings to error_mark_node, and the lazily-created
492 bindings of __func__ and its friends get this scope. */
494 static GTY(()) struct c_scope *current_function_scope;
496 /* The C file scope. This is reset for each input translation unit. */
498 static GTY(()) struct c_scope *file_scope;
500 /* The outermost scope. This is used for all declarations with
501 external linkage, and only these, hence the name. */
503 static GTY(()) struct c_scope *external_scope;
505 /* A chain of c_scope structures awaiting reuse. */
507 static GTY((deletable)) struct c_scope *scope_freelist;
509 /* A chain of c_binding structures awaiting reuse. */
511 static GTY((deletable)) struct c_binding *binding_freelist;
513 /* Append VAR to LIST in scope SCOPE. */
514 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
515 struct c_scope *s_ = (scope); \
517 if (s_->list##_last) \
518 BLOCK_CHAIN (s_->list##_last) = d_; \
521 s_->list##_last = d_; \
524 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
525 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
526 struct c_scope *t_ = (tscope); \
527 struct c_scope *f_ = (fscope); \
529 BLOCK_CHAIN (t_->to##_last) = f_->from; \
532 t_->to##_last = f_->from##_last; \
535 /* A c_inline_static structure stores details of a static identifier
536 referenced in a definition of a function that may be an inline
537 definition if no subsequent declaration of that function uses
538 "extern" or does not use "inline". */
540 struct GTY((chain_next ("%h.next"))) c_inline_static {
541 /* The location for a diagnostic. */
544 /* The function that may be an inline definition. */
547 /* The object or function referenced. */
550 /* What sort of reference this is. */
551 enum c_inline_static_type type;
553 /* The next such structure or NULL. */
554 struct c_inline_static *next;
557 /* List of static identifiers used or referenced in functions that may
558 be inline definitions. */
559 static GTY(()) struct c_inline_static *c_inline_statics;
561 /* True means unconditionally make a BLOCK for the next scope pushed. */
563 static bool keep_next_level_flag;
565 /* True means the next call to push_scope will be the outermost scope
566 of a function body, so do not push a new scope, merely cease
567 expecting parameter decls. */
569 static bool next_is_function_body;
571 /* A vector of pointers to c_binding structures. */
573 typedef struct c_binding *c_binding_ptr;
575 /* Information that we keep for a struct or union while it is being
578 struct c_struct_parse_info
580 /* If warn_cxx_compat, a list of types defined within this
582 vec<tree> struct_types;
583 /* If warn_cxx_compat, a list of field names which have bindings,
584 and which are defined in this struct, but which are not defined
585 in any enclosing struct. This is used to clear the in_struct
586 field of the c_bindings structure. */
587 vec<c_binding_ptr> fields;
588 /* If warn_cxx_compat, a list of typedef names used when defining
589 fields in this struct. */
590 vec<tree> typedefs_seen;
593 /* Information for the struct or union currently being parsed, or
594 NULL if not parsing a struct or union. */
595 static struct c_struct_parse_info *struct_parse_info;
597 /* Forward declarations. */
598 static tree lookup_name_in_scope (tree, struct c_scope *);
599 static tree c_make_fname_decl (location_t, tree, int);
600 static tree grokdeclarator (const struct c_declarator *,
601 struct c_declspecs *,
602 enum decl_context, bool, tree *, tree *, tree *,
603 bool *, enum deprecated_states);
604 static tree grokparms (struct c_arg_info *, bool);
605 static void layout_array_type (tree);
606 static void warn_defaults_to (location_t, int, const char *, ...)
607 ATTRIBUTE_GCC_DIAG(3,4);
609 /* T is a statement. Add it to the statement-tree. This is the
610 C/ObjC version--C++ has a slightly different version of this
616 enum tree_code code = TREE_CODE (t);
618 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
620 if (!EXPR_HAS_LOCATION (t))
621 SET_EXPR_LOCATION (t, input_location);
624 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
625 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
627 /* Add T to the statement-tree. Non-side-effect statements need to be
628 recorded during statement expressions. */
629 if (!building_stmt_list_p ())
631 append_to_statement_list_force (t, &cur_stmt_list);
636 /* Build a pointer type using the default pointer mode. */
639 c_build_pointer_type (tree to_type)
641 addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC
642 : TYPE_ADDR_SPACE (to_type);
643 machine_mode pointer_mode;
645 if (as != ADDR_SPACE_GENERIC || c_default_pointer_mode == VOIDmode)
646 pointer_mode = targetm.addr_space.pointer_mode (as);
648 pointer_mode = c_default_pointer_mode;
649 return build_pointer_type_for_mode (to_type, pointer_mode, false);
653 /* Return true if we will want to say something if a goto statement
657 decl_jump_unsafe (tree decl)
659 if (error_operand_p (decl))
662 /* Always warn about crossing variably modified types. */
663 if ((VAR_P (decl) || TREE_CODE (decl) == TYPE_DECL)
664 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
667 /* Otherwise, only warn if -Wgoto-misses-init and this is an
668 initialized automatic decl. */
669 if (warn_jump_misses_init
671 && !TREE_STATIC (decl)
672 && DECL_INITIAL (decl) != NULL_TREE)
680 c_print_identifier (FILE *file, tree node, int indent)
682 void (*save) (enum c_oracle_request, tree identifier);
684 /* Temporarily hide any binding oracle. Without this, calls to
685 debug_tree from the debugger will end up calling into the oracle,
686 making for a confusing debug session. As the oracle isn't needed
687 here for normal operation, it's simplest to suppress it. */
688 save = c_binding_oracle;
689 c_binding_oracle = NULL;
691 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
692 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
693 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
694 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
696 tree rid = ridpointers[C_RID_CODE (node)];
697 indent_to (file, indent + 4);
698 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
699 (void *) rid, IDENTIFIER_POINTER (rid));
702 c_binding_oracle = save;
705 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
706 which may be any of several kinds of DECL or TYPE or error_mark_node,
707 in the scope SCOPE. */
709 bind (tree name, tree decl, struct c_scope *scope, bool invisible,
710 bool nested, location_t locus)
712 struct c_binding *b, **here;
714 if (binding_freelist)
716 b = binding_freelist;
717 binding_freelist = b->prev;
720 b = ggc_alloc<c_binding> ();
725 b->depth = scope->depth;
726 b->invisible = invisible;
734 b->prev = scope->bindings;
737 if (decl_jump_unsafe (decl))
738 scope->has_jump_unsafe_decl = 1;
743 switch (TREE_CODE (decl))
745 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
748 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
754 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
760 /* Locate the appropriate place in the chain of shadowed decls
761 to insert this binding. Normally, scope == current_scope and
762 this does nothing. */
763 while (*here && (*here)->depth > scope->depth)
764 here = &(*here)->shadowed;
770 /* Clear the binding structure B, stick it on the binding_freelist,
771 and return the former value of b->prev. This is used by pop_scope
772 and get_parm_info to iterate destructively over all the bindings
773 from a given scope. */
774 static struct c_binding *
775 free_binding_and_advance (struct c_binding *b)
777 struct c_binding *prev = b->prev;
779 memset (b, 0, sizeof (struct c_binding));
780 b->prev = binding_freelist;
781 binding_freelist = b;
786 /* Bind a label. Like bind, but skip fields which aren't used for
787 labels, and add the LABEL_VARS value. */
789 bind_label (tree name, tree label, struct c_scope *scope,
790 struct c_label_vars *label_vars)
794 bind (name, label, scope, /*invisible=*/false, /*nested=*/false,
797 scope->has_label_bindings = true;
800 gcc_assert (b->decl == label);
801 label_vars->shadowed = b->u.label;
802 b->u.label = label_vars;
805 /* Hook called at end of compilation to assume 1 elt
806 for a file-scope tentative array defn that wasn't complete before. */
809 c_finish_incomplete_decl (tree decl)
813 tree type = TREE_TYPE (decl);
814 if (type != error_mark_node
815 && TREE_CODE (type) == ARRAY_TYPE
816 && !DECL_EXTERNAL (decl)
817 && TYPE_DOMAIN (type) == 0)
819 warning_at (DECL_SOURCE_LOCATION (decl),
820 0, "array %q+D assumed to have one element", decl);
822 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
824 relayout_decl (decl);
829 /* Record that inline function FUNC contains a reference (location
830 LOC) to static DECL (file-scope or function-local according to
834 record_inline_static (location_t loc, tree func, tree decl,
835 enum c_inline_static_type type)
837 c_inline_static *csi = ggc_alloc<c_inline_static> ();
839 csi->function = func;
840 csi->static_decl = decl;
842 csi->next = c_inline_statics;
843 c_inline_statics = csi;
846 /* Check for references to static declarations in inline functions at
847 the end of the translation unit and diagnose them if the functions
848 are still inline definitions. */
851 check_inline_statics (void)
853 struct c_inline_static *csi;
854 for (csi = c_inline_statics; csi; csi = csi->next)
856 if (DECL_EXTERNAL (csi->function))
860 pedwarn (csi->location, 0,
861 "%qD is static but used in inline function %qD "
862 "which is not static", csi->static_decl, csi->function);
865 pedwarn (csi->location, 0,
866 "%q+D is static but declared in inline function %qD "
867 "which is not static", csi->static_decl, csi->function);
873 c_inline_statics = NULL;
876 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
877 for the current state, otherwise set it to uninitialized. */
880 set_spot_bindings (struct c_spot_bindings *p, bool defining)
884 p->scope = current_scope;
885 p->bindings_in_scope = current_scope->bindings;
890 p->bindings_in_scope = NULL;
893 p->left_stmt_expr = false;
896 /* Update spot bindings P as we pop out of SCOPE. Return true if we
897 should push decls for a label. */
900 update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p)
902 if (p->scope != scope)
904 /* This label or goto is defined in some other scope, or it is a
905 label which is not yet defined. There is nothing to
910 /* Adjust the spot bindings to refer to the bindings already defined
911 in the enclosing scope. */
912 p->scope = scope->outer;
913 p->bindings_in_scope = p->scope->bindings;
918 /* The Objective-C front-end often needs to determine the current scope. */
921 objc_get_current_scope (void)
923 return current_scope;
926 /* The following function is used only by Objective-C. It needs to live here
927 because it accesses the innards of c_scope. */
930 objc_mark_locals_volatile (void *enclosing_blk)
932 struct c_scope *scope;
935 for (scope = current_scope;
936 scope && scope != enclosing_blk;
937 scope = scope->outer)
939 for (b = scope->bindings; b; b = b->prev)
940 objc_volatilize_decl (b->decl);
942 /* Do not climb up past the current function. */
943 if (scope->function_body)
948 /* Return true if we are in the global binding level. */
951 global_bindings_p (void)
953 return current_scope == file_scope;
957 keep_next_level (void)
959 keep_next_level_flag = true;
962 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
965 set_float_const_decimal64 (void)
967 current_scope->float_const_decimal64 = true;
970 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
973 clear_float_const_decimal64 (void)
975 current_scope->float_const_decimal64 = false;
978 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
981 float_const_decimal64_p (void)
983 return current_scope->float_const_decimal64;
986 /* Identify this scope as currently being filled with parameters. */
989 declare_parm_level (void)
991 current_scope->parm_flag = true;
997 if (next_is_function_body)
999 /* This is the transition from the parameters to the top level
1000 of the function body. These are the same scope
1001 (C99 6.2.1p4,6) so we do not push another scope structure.
1002 next_is_function_body is set only by store_parm_decls, which
1003 in turn is called when and only when we are about to
1004 encounter the opening curly brace for the function body.
1006 The outermost block of a function always gets a BLOCK node,
1007 because the debugging output routines expect that each
1008 function has at least one BLOCK. */
1009 current_scope->parm_flag = false;
1010 current_scope->function_body = true;
1011 current_scope->keep = true;
1012 current_scope->outer_function = current_function_scope;
1013 current_function_scope = current_scope;
1015 keep_next_level_flag = false;
1016 next_is_function_body = false;
1018 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1019 if (current_scope->outer)
1020 current_scope->float_const_decimal64
1021 = current_scope->outer->float_const_decimal64;
1023 current_scope->float_const_decimal64 = false;
1027 struct c_scope *scope;
1030 scope = scope_freelist;
1031 scope_freelist = scope->outer;
1034 scope = ggc_cleared_alloc<c_scope> ();
1036 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1038 scope->float_const_decimal64 = current_scope->float_const_decimal64;
1040 scope->float_const_decimal64 = false;
1042 scope->keep = keep_next_level_flag;
1043 scope->outer = current_scope;
1044 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
1046 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
1048 if (current_scope && scope->depth == 0)
1051 sorry ("GCC supports only %u nested scopes", scope->depth);
1054 current_scope = scope;
1055 keep_next_level_flag = false;
1059 /* This is called when we are leaving SCOPE. For each label defined
1060 in SCOPE, add any appropriate decls to its decls_in_scope fields.
1061 These are the decls whose initialization will be skipped by a goto
1062 later in the function. */
1065 update_label_decls (struct c_scope *scope)
1072 if (s->has_label_bindings)
1074 struct c_binding *b;
1076 for (b = s->bindings; b != NULL; b = b->prev)
1078 struct c_label_vars *label_vars;
1079 struct c_binding *b1;
1082 struct c_goto_bindings *g;
1084 if (TREE_CODE (b->decl) != LABEL_DECL)
1086 label_vars = b->u.label;
1088 b1 = label_vars->label_bindings.bindings_in_scope;
1089 if (label_vars->label_bindings.scope == NULL)
1092 hjud = label_vars->label_bindings.scope->has_jump_unsafe_decl;
1093 if (update_spot_bindings (scope, &label_vars->label_bindings))
1095 /* This label is defined in this scope. */
1098 for (; b1 != NULL; b1 = b1->prev)
1100 /* A goto from later in the function to this
1101 label will never see the initialization
1102 of B1, if any. Save it to issue a
1103 warning if needed. */
1104 if (decl_jump_unsafe (b1->decl))
1105 vec_safe_push(label_vars->decls_in_scope, b1->decl);
1110 /* Update the bindings of any goto statements associated
1112 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1113 update_spot_bindings (scope, &g->goto_bindings);
1117 /* Don't search beyond the current function. */
1118 if (s == current_function_scope)
1125 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1128 set_type_context (tree type, tree context)
1130 for (type = TYPE_MAIN_VARIANT (type); type;
1131 type = TYPE_NEXT_VARIANT (type))
1132 TYPE_CONTEXT (type) = context;
1135 /* Exit a scope. Restore the state of the identifier-decl mappings
1136 that were in effect when this scope was entered. Return a BLOCK
1137 node containing all the DECLs in this scope that are of interest
1138 to debug info generation. */
1143 struct c_scope *scope = current_scope;
1144 tree block, context, p;
1145 struct c_binding *b;
1147 bool functionbody = scope->function_body;
1148 bool keep = functionbody || scope->keep || scope->bindings;
1150 update_label_decls (scope);
1152 /* If appropriate, create a BLOCK to record the decls for the life
1153 of this function. */
1157 block = make_node (BLOCK);
1158 BLOCK_SUBBLOCKS (block) = scope->blocks;
1159 TREE_USED (block) = 1;
1161 /* In each subblock, record that this is its superior. */
1162 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
1163 BLOCK_SUPERCONTEXT (p) = block;
1165 BLOCK_VARS (block) = 0;
1168 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1169 scope must be set so that they point to the appropriate
1170 construct, i.e. either to the current FUNCTION_DECL node, or
1171 else to the BLOCK node we just constructed.
1173 Note that for tagged types whose scope is just the formal
1174 parameter list for some function type specification, we can't
1175 properly set their TYPE_CONTEXTs here, because we don't have a
1176 pointer to the appropriate FUNCTION_TYPE node readily available
1177 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1178 type nodes get set in `grokdeclarator' as soon as we have created
1179 the FUNCTION_TYPE node which will represent the "scope" for these
1180 "parameter list local" tagged types. */
1181 if (scope->function_body)
1182 context = current_function_decl;
1183 else if (scope == file_scope)
1185 tree file_decl = build_translation_unit_decl (NULL_TREE);
1186 context = file_decl;
1187 debug_hooks->register_main_translation_unit (file_decl);
1192 /* Clear all bindings in this scope. */
1193 for (b = scope->bindings; b; b = free_binding_and_advance (b))
1196 switch (TREE_CODE (p))
1199 /* Warnings for unused labels, errors for undefined labels. */
1200 if (TREE_USED (p) && !DECL_INITIAL (p))
1202 error ("label %q+D used but not defined", p);
1203 DECL_INITIAL (p) = error_mark_node;
1206 warn_for_unused_label (p);
1208 /* Labels go in BLOCK_VARS. */
1209 DECL_CHAIN (p) = BLOCK_VARS (block);
1210 BLOCK_VARS (block) = p;
1211 gcc_assert (I_LABEL_BINDING (b->id) == b);
1212 I_LABEL_BINDING (b->id) = b->shadowed;
1214 /* Also pop back to the shadowed label_vars. */
1215 release_tree_vector (b->u.label->decls_in_scope);
1216 b->u.label = b->u.label->shadowed;
1222 set_type_context (p, context);
1224 /* Types may not have tag-names, in which case the type
1225 appears in the bindings list with b->id NULL. */
1228 gcc_assert (I_TAG_BINDING (b->id) == b);
1229 I_TAG_BINDING (b->id) = b->shadowed;
1234 /* Propagate TREE_ADDRESSABLE from nested functions to their
1235 containing functions. */
1236 if (!TREE_ASM_WRITTEN (p)
1237 && DECL_INITIAL (p) != 0
1238 && TREE_ADDRESSABLE (p)
1239 && DECL_ABSTRACT_ORIGIN (p) != 0
1240 && DECL_ABSTRACT_ORIGIN (p) != p)
1241 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
1242 if (!DECL_EXTERNAL (p)
1243 && !DECL_INITIAL (p)
1244 && scope != file_scope
1245 && scope != external_scope)
1247 error ("nested function %q+D declared but never defined", p);
1248 undef_nested_function = true;
1250 else if (DECL_DECLARED_INLINE_P (p)
1252 && !DECL_INITIAL (p))
1254 /* C99 6.7.4p6: "a function with external linkage... declared
1255 with an inline function specifier ... shall also be defined
1256 in the same translation unit." */
1257 if (!flag_gnu89_inline
1258 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (p))
1259 && scope != external_scope)
1260 pedwarn (input_location, 0,
1261 "inline function %q+D declared but never defined", p);
1262 DECL_EXTERNAL (p) = 1;
1268 /* Warnings for unused variables. */
1269 if ((!TREE_USED (p) || !DECL_READ_P (p))
1270 && !TREE_NO_WARNING (p)
1271 && !DECL_IN_SYSTEM_HEADER (p)
1273 && !DECL_ARTIFICIAL (p)
1274 && scope != file_scope
1275 && scope != external_scope)
1278 warning (OPT_Wunused_variable, "unused variable %q+D", p);
1279 else if (DECL_CONTEXT (p) == current_function_decl)
1280 warning_at (DECL_SOURCE_LOCATION (p),
1281 OPT_Wunused_but_set_variable,
1282 "variable %qD set but not used", p);
1287 error ("type of array %q+D completed incompatibly with"
1288 " implicit initialization", p);
1295 /* All of these go in BLOCK_VARS, but only if this is the
1296 binding in the home scope. */
1299 DECL_CHAIN (p) = BLOCK_VARS (block);
1300 BLOCK_VARS (block) = p;
1302 else if (VAR_OR_FUNCTION_DECL_P (p) && scope != file_scope)
1304 /* For block local externs add a special
1305 DECL_EXTERNAL decl for debug info generation. */
1306 tree extp = copy_node (p);
1308 DECL_EXTERNAL (extp) = 1;
1309 TREE_STATIC (extp) = 0;
1310 TREE_PUBLIC (extp) = 1;
1311 DECL_INITIAL (extp) = NULL_TREE;
1312 DECL_LANG_SPECIFIC (extp) = NULL;
1313 DECL_CONTEXT (extp) = current_function_decl;
1314 if (TREE_CODE (p) == FUNCTION_DECL)
1316 DECL_RESULT (extp) = NULL_TREE;
1317 DECL_SAVED_TREE (extp) = NULL_TREE;
1318 DECL_STRUCT_FUNCTION (extp) = NULL;
1320 if (b->locus != UNKNOWN_LOCATION)
1321 DECL_SOURCE_LOCATION (extp) = b->locus;
1322 DECL_CHAIN (extp) = BLOCK_VARS (block);
1323 BLOCK_VARS (block) = extp;
1325 /* If this is the file scope set DECL_CONTEXT of each decl to
1326 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1328 if (scope == file_scope)
1330 DECL_CONTEXT (p) = context;
1331 if (TREE_CODE (p) == TYPE_DECL
1332 && TREE_TYPE (p) != error_mark_node)
1333 set_type_context (TREE_TYPE (p), context);
1337 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1338 already been put there by store_parm_decls. Unused-
1339 parameter warnings are handled by function.c.
1340 error_mark_node obviously does not go in BLOCK_VARS and
1341 does not get unused-variable warnings. */
1344 /* It is possible for a decl not to have a name. We get
1345 here with b->id NULL in this case. */
1348 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
1349 I_SYMBOL_BINDING (b->id) = b->shadowed;
1350 if (b->shadowed && b->shadowed->u.type)
1351 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
1361 /* Dispose of the block that we just made inside some higher level. */
1362 if ((scope->function_body || scope == file_scope) && context)
1364 DECL_INITIAL (context) = block;
1365 BLOCK_SUPERCONTEXT (block) = context;
1367 else if (scope->outer)
1370 SCOPE_LIST_APPEND (scope->outer, blocks, block);
1371 /* If we did not make a block for the scope just exited, any
1372 blocks made for inner scopes must be carried forward so they
1373 will later become subblocks of something else. */
1374 else if (scope->blocks)
1375 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
1378 /* Pop the current scope, and free the structure for reuse. */
1379 current_scope = scope->outer;
1380 if (scope->function_body)
1381 current_function_scope = scope->outer_function;
1383 memset (scope, 0, sizeof (struct c_scope));
1384 scope->outer = scope_freelist;
1385 scope_freelist = scope;
1391 push_file_scope (void)
1399 file_scope = current_scope;
1401 start_fname_decls ();
1403 for (decl = visible_builtins; decl; decl = DECL_CHAIN (decl))
1404 bind (DECL_NAME (decl), decl, file_scope,
1405 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl));
1409 pop_file_scope (void)
1411 /* In case there were missing closebraces, get us back to the global
1413 while (current_scope != file_scope)
1416 /* __FUNCTION__ is defined at file scope (""). This
1417 call may not be necessary as my tests indicate it
1418 still works without it. */
1419 finish_fname_decls ();
1421 check_inline_statics ();
1423 /* This is the point to write out a PCH if we're doing that.
1424 In that case we do not want to do anything else. */
1427 c_common_write_pch ();
1431 /* Pop off the file scope and close this translation unit. */
1435 maybe_apply_pending_pragma_weaks ();
1438 /* Adjust the bindings for the start of a statement expression. */
1441 c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings)
1443 struct c_scope *scope;
1445 for (scope = current_scope; scope != NULL; scope = scope->outer)
1447 struct c_binding *b;
1449 if (!scope->has_label_bindings)
1452 for (b = scope->bindings; b != NULL; b = b->prev)
1454 struct c_label_vars *label_vars;
1456 struct c_goto_bindings *g;
1458 if (TREE_CODE (b->decl) != LABEL_DECL)
1460 label_vars = b->u.label;
1461 ++label_vars->label_bindings.stmt_exprs;
1462 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1463 ++g->goto_bindings.stmt_exprs;
1467 if (switch_bindings != NULL)
1468 ++switch_bindings->stmt_exprs;
1471 /* Adjust the bindings for the end of a statement expression. */
1474 c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings)
1476 struct c_scope *scope;
1478 for (scope = current_scope; scope != NULL; scope = scope->outer)
1480 struct c_binding *b;
1482 if (!scope->has_label_bindings)
1485 for (b = scope->bindings; b != NULL; b = b->prev)
1487 struct c_label_vars *label_vars;
1489 struct c_goto_bindings *g;
1491 if (TREE_CODE (b->decl) != LABEL_DECL)
1493 label_vars = b->u.label;
1494 --label_vars->label_bindings.stmt_exprs;
1495 if (label_vars->label_bindings.stmt_exprs < 0)
1497 label_vars->label_bindings.left_stmt_expr = true;
1498 label_vars->label_bindings.stmt_exprs = 0;
1500 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1502 --g->goto_bindings.stmt_exprs;
1503 if (g->goto_bindings.stmt_exprs < 0)
1505 g->goto_bindings.left_stmt_expr = true;
1506 g->goto_bindings.stmt_exprs = 0;
1512 if (switch_bindings != NULL)
1514 --switch_bindings->stmt_exprs;
1515 gcc_assert (switch_bindings->stmt_exprs >= 0);
1519 /* Push a definition or a declaration of struct, union or enum tag "name".
1520 "type" should be the type node.
1521 We assume that the tag "name" is not already defined, and has a location
1524 Note that the definition may really be just a forward reference.
1525 In that case, the TYPE_SIZE will be zero. */
1528 pushtag (location_t loc, tree name, tree type)
1530 /* Record the identifier as the type's name if it has none. */
1531 if (name && !TYPE_NAME (type))
1532 TYPE_NAME (type) = name;
1533 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc);
1535 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1536 tagged type we just added to the current scope. This fake
1537 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1538 to output a representation of a tagged type, and it also gives
1539 us a convenient place to record the "scope start" address for the
1542 TYPE_STUB_DECL (type) = pushdecl (build_decl (loc,
1543 TYPE_DECL, NULL_TREE, type));
1545 /* An approximation for now, so we can tell this is a function-scope tag.
1546 This will be updated in pop_scope. */
1547 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1549 if (warn_cxx_compat && name != NULL_TREE)
1551 struct c_binding *b = I_SYMBOL_BINDING (name);
1554 && b->decl != NULL_TREE
1555 && TREE_CODE (b->decl) == TYPE_DECL
1556 && (B_IN_CURRENT_SCOPE (b)
1557 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
1558 && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl))
1559 != TYPE_MAIN_VARIANT (type)))
1561 warning_at (loc, OPT_Wc___compat,
1562 ("using %qD as both a typedef and a tag is "
1565 if (b->locus != UNKNOWN_LOCATION)
1566 inform (b->locus, "originally defined here");
1571 /* An exported interface to pushtag. This is used by the gdb plugin's
1572 binding oracle to introduce a new tag binding. */
1575 c_pushtag (location_t loc, tree name, tree type)
1577 pushtag (loc, name, type);
1580 /* An exported interface to bind a declaration. LOC is the location
1581 to use. DECL is the declaration to bind. The decl's name is used
1582 to determine how it is bound. If DECL is a VAR_DECL, then
1583 IS_GLOBAL determines whether the decl is put into the global (file
1584 and external) scope or the current function's scope; if DECL is not
1585 a VAR_DECL then it is always put into the file scope. */
1588 c_bind (location_t loc, tree decl, bool is_global)
1590 struct c_scope *scope;
1591 bool nested = false;
1593 if (!VAR_P (decl) || current_function_scope == NULL)
1595 /* Types and functions are always considered to be global. */
1597 DECL_EXTERNAL (decl) = 1;
1598 TREE_PUBLIC (decl) = 1;
1602 /* Also bind it into the external scope. */
1603 bind (DECL_NAME (decl), decl, external_scope, true, false, loc);
1606 DECL_EXTERNAL (decl) = 1;
1607 TREE_PUBLIC (decl) = 1;
1611 DECL_CONTEXT (decl) = current_function_decl;
1612 TREE_PUBLIC (decl) = 0;
1613 scope = current_function_scope;
1616 bind (DECL_NAME (decl), decl, scope, false, nested, loc);
1619 /* Subroutine of compare_decls. Allow harmless mismatches in return
1620 and argument types provided that the type modes match. This function
1621 return a unified type given a suitable match, and 0 otherwise. */
1624 match_builtin_function_types (tree newtype, tree oldtype)
1626 tree newrettype, oldrettype;
1627 tree newargs, oldargs;
1628 tree trytype, tryargs;
1630 /* Accept the return type of the new declaration if same modes. */
1631 oldrettype = TREE_TYPE (oldtype);
1632 newrettype = TREE_TYPE (newtype);
1634 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1637 oldargs = TYPE_ARG_TYPES (oldtype);
1638 newargs = TYPE_ARG_TYPES (newtype);
1641 while (oldargs || newargs)
1645 || !TREE_VALUE (oldargs)
1646 || !TREE_VALUE (newargs)
1647 || TYPE_MODE (TREE_VALUE (oldargs))
1648 != TYPE_MODE (TREE_VALUE (newargs)))
1651 oldargs = TREE_CHAIN (oldargs);
1652 newargs = TREE_CHAIN (newargs);
1655 trytype = build_function_type (newrettype, tryargs);
1657 /* Allow declaration to change transaction_safe attribute. */
1658 tree oldattrs = TYPE_ATTRIBUTES (oldtype);
1659 tree oldtsafe = lookup_attribute ("transaction_safe", oldattrs);
1660 tree newattrs = TYPE_ATTRIBUTES (newtype);
1661 tree newtsafe = lookup_attribute ("transaction_safe", newattrs);
1662 if (oldtsafe && !newtsafe)
1663 oldattrs = remove_attribute ("transaction_safe", oldattrs);
1664 else if (newtsafe && !oldtsafe)
1665 oldattrs = tree_cons (get_identifier ("transaction_safe"),
1666 NULL_TREE, oldattrs);
1668 return build_type_attribute_variant (trytype, oldattrs);
1671 /* Subroutine of diagnose_mismatched_decls. Check for function type
1672 mismatch involving an empty arglist vs a nonempty one and give clearer
1675 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1676 tree newtype, tree oldtype)
1680 if (TREE_CODE (olddecl) != FUNCTION_DECL
1681 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1682 || !((!prototype_p (oldtype) && DECL_INITIAL (olddecl) == 0)
1683 || (!prototype_p (newtype) && DECL_INITIAL (newdecl) == 0)))
1686 t = TYPE_ARG_TYPES (oldtype);
1688 t = TYPE_ARG_TYPES (newtype);
1689 for (; t; t = TREE_CHAIN (t))
1691 tree type = TREE_VALUE (t);
1693 if (TREE_CHAIN (t) == 0
1694 && TYPE_MAIN_VARIANT (type) != void_type_node)
1696 inform (input_location, "a parameter list with an ellipsis can%'t match "
1697 "an empty parameter name list declaration");
1701 if (c_type_promotes_to (type) != type)
1703 inform (input_location, "an argument type that has a default promotion can%'t match "
1704 "an empty parameter name list declaration");
1710 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1711 old-style function definition, NEWDECL is a prototype declaration.
1712 Diagnose inconsistencies in the argument list. Returns TRUE if
1713 the prototype is compatible, FALSE if not. */
1715 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1717 tree newargs, oldargs;
1720 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1722 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1723 newargs = TYPE_ARG_TYPES (newtype);
1728 tree oldargtype = TREE_VALUE (oldargs);
1729 tree newargtype = TREE_VALUE (newargs);
1731 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1734 oldargtype = (TYPE_ATOMIC (oldargtype)
1735 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype),
1737 : TYPE_MAIN_VARIANT (oldargtype));
1738 newargtype = (TYPE_ATOMIC (newargtype)
1739 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype),
1741 : TYPE_MAIN_VARIANT (newargtype));
1743 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1746 /* Reaching the end of just one list means the two decls don't
1747 agree on the number of arguments. */
1748 if (END_OF_ARGLIST (oldargtype))
1750 error ("prototype for %q+D declares more arguments "
1751 "than previous old-style definition", newdecl);
1754 else if (END_OF_ARGLIST (newargtype))
1756 error ("prototype for %q+D declares fewer arguments "
1757 "than previous old-style definition", newdecl);
1761 /* Type for passing arg must be consistent with that declared
1763 else if (!comptypes (oldargtype, newargtype))
1765 error ("prototype for %q+D declares argument %d"
1766 " with incompatible type",
1771 oldargs = TREE_CHAIN (oldargs);
1772 newargs = TREE_CHAIN (newargs);
1776 /* If we get here, no errors were found, but do issue a warning
1777 for this poor-style construct. */
1778 warning (0, "prototype for %q+D follows non-prototype definition",
1781 #undef END_OF_ARGLIST
1784 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1785 first in a pair of mismatched declarations, using the diagnostic
1788 locate_old_decl (tree decl)
1790 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)
1791 && !C_DECL_DECLARED_BUILTIN (decl))
1793 else if (DECL_INITIAL (decl))
1794 inform (input_location, "previous definition of %q+D was here", decl);
1795 else if (C_DECL_IMPLICIT (decl))
1796 inform (input_location, "previous implicit declaration of %q+D was here", decl);
1798 inform (input_location, "previous declaration of %q+D was here", decl);
1801 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1802 Returns true if the caller should proceed to merge the two, false
1803 if OLDDECL should simply be discarded. As a side effect, issues
1804 all necessary diagnostics for invalid or poor-style combinations.
1805 If it returns true, writes the types of NEWDECL and OLDDECL to
1806 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1807 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1810 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1811 tree *newtypep, tree *oldtypep)
1813 tree newtype, oldtype;
1814 bool pedwarned = false;
1815 bool warned = false;
1818 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1819 && DECL_EXTERNAL (DECL))
1821 /* If we have error_mark_node for either decl or type, just discard
1822 the previous decl - we're in an error cascade already. */
1823 if (olddecl == error_mark_node || newdecl == error_mark_node)
1825 *oldtypep = oldtype = TREE_TYPE (olddecl);
1826 *newtypep = newtype = TREE_TYPE (newdecl);
1827 if (oldtype == error_mark_node || newtype == error_mark_node)
1830 /* Two different categories of symbol altogether. This is an error
1831 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1832 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1834 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1835 && DECL_BUILT_IN (olddecl)
1836 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1838 error ("%q+D redeclared as different kind of symbol", newdecl);
1839 locate_old_decl (olddecl);
1841 else if (TREE_PUBLIC (newdecl))
1842 warning (0, "built-in function %q+D declared as non-function",
1845 warning (OPT_Wshadow, "declaration of %q+D shadows "
1846 "a built-in function", newdecl);
1850 /* Enumerators have no linkage, so may only be declared once in a
1852 if (TREE_CODE (olddecl) == CONST_DECL)
1854 error ("redeclaration of enumerator %q+D", newdecl);
1855 locate_old_decl (olddecl);
1859 if (!comptypes (oldtype, newtype))
1861 if (TREE_CODE (olddecl) == FUNCTION_DECL
1862 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1864 /* Accept harmless mismatch in function types.
1865 This is for the ffs and fprintf builtins. */
1866 tree trytype = match_builtin_function_types (newtype, oldtype);
1868 if (trytype && comptypes (newtype, trytype))
1869 *oldtypep = oldtype = trytype;
1872 /* If types don't match for a built-in, throw away the
1873 built-in. No point in calling locate_old_decl here, it
1874 won't print anything. */
1875 warning (0, "conflicting types for built-in function %q+D",
1880 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1881 && DECL_IS_BUILTIN (olddecl))
1883 /* A conflicting function declaration for a predeclared
1884 function that isn't actually built in. Objective C uses
1885 these. The new declaration silently overrides everything
1886 but the volatility (i.e. noreturn) indication. See also
1887 below. FIXME: Make Objective C use normal builtins. */
1888 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1891 /* Permit void foo (...) to match int foo (...) if the latter is
1892 the definition and implicit int was used. See
1893 c-torture/compile/920625-2.c. */
1894 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1895 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1896 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1897 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1899 pedwarned = pedwarn (input_location, 0,
1900 "conflicting types for %q+D", newdecl);
1901 /* Make sure we keep void as the return type. */
1902 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1903 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1905 /* Permit void foo (...) to match an earlier call to foo (...) with
1906 no declared type (thus, implicitly int). */
1907 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1908 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1909 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1910 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1912 pedwarned = pedwarn (input_location, 0,
1913 "conflicting types for %q+D", newdecl);
1914 /* Make sure we keep void as the return type. */
1915 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1919 int new_quals = TYPE_QUALS (newtype);
1920 int old_quals = TYPE_QUALS (oldtype);
1922 if (new_quals != old_quals)
1924 addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals);
1925 addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals);
1926 if (new_addr != old_addr)
1928 if (ADDR_SPACE_GENERIC_P (new_addr))
1929 error ("conflicting named address spaces (generic vs %s) "
1931 c_addr_space_name (old_addr), newdecl);
1932 else if (ADDR_SPACE_GENERIC_P (old_addr))
1933 error ("conflicting named address spaces (%s vs generic) "
1935 c_addr_space_name (new_addr), newdecl);
1937 error ("conflicting named address spaces (%s vs %s) "
1939 c_addr_space_name (new_addr),
1940 c_addr_space_name (old_addr),
1944 if (CLEAR_QUAL_ADDR_SPACE (new_quals)
1945 != CLEAR_QUAL_ADDR_SPACE (old_quals))
1946 error ("conflicting type qualifiers for %q+D", newdecl);
1949 error ("conflicting types for %q+D", newdecl);
1950 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1951 locate_old_decl (olddecl);
1956 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1957 but silently ignore the redeclaration if either is in a system
1958 header. (Conflicting redeclarations were handled above.) This
1959 is allowed for C11 if the types are the same, not just
1961 if (TREE_CODE (newdecl) == TYPE_DECL)
1963 bool types_different = false;
1964 int comptypes_result;
1967 = comptypes_check_different_types (oldtype, newtype, &types_different);
1969 if (comptypes_result != 1 || types_different)
1971 error ("redefinition of typedef %q+D with different type", newdecl);
1972 locate_old_decl (olddecl);
1976 if (DECL_IN_SYSTEM_HEADER (newdecl)
1977 || DECL_IN_SYSTEM_HEADER (olddecl)
1978 || TREE_NO_WARNING (newdecl)
1979 || TREE_NO_WARNING (olddecl))
1980 return true; /* Allow OLDDECL to continue in use. */
1982 if (variably_modified_type_p (newtype, NULL))
1984 error ("redefinition of typedef %q+D with variably modified type",
1986 locate_old_decl (olddecl);
1988 else if (pedwarn_c99 (input_location, OPT_Wpedantic,
1989 "redefinition of typedef %q+D", newdecl))
1990 locate_old_decl (olddecl);
1995 /* Function declarations can either be 'static' or 'extern' (no
1996 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1997 can never conflict with each other on account of linkage
1998 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1999 gnu89 mode permits two definitions if one is 'extern inline' and
2000 one is not. The non- extern-inline definition supersedes the
2001 extern-inline definition. */
2003 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2005 /* If you declare a built-in function name as static, or
2006 define the built-in with an old-style definition (so we
2007 can't validate the argument list) the built-in definition is
2008 overridden, but optionally warn this was a bad choice of name. */
2009 if (DECL_BUILT_IN (olddecl)
2010 && !C_DECL_DECLARED_BUILTIN (olddecl)
2011 && (!TREE_PUBLIC (newdecl)
2012 || (DECL_INITIAL (newdecl)
2013 && !prototype_p (TREE_TYPE (newdecl)))))
2015 warning (OPT_Wshadow, "declaration of %q+D shadows "
2016 "a built-in function", newdecl);
2017 /* Discard the old built-in function. */
2021 if (DECL_INITIAL (newdecl))
2023 if (DECL_INITIAL (olddecl))
2025 /* If both decls are in the same TU and the new declaration
2026 isn't overriding an extern inline reject the new decl.
2027 In c99, no overriding is allowed in the same translation
2029 if ((!DECL_EXTERN_INLINE (olddecl)
2030 || DECL_EXTERN_INLINE (newdecl)
2031 || (!flag_gnu89_inline
2032 && (!DECL_DECLARED_INLINE_P (olddecl)
2033 || !lookup_attribute ("gnu_inline",
2034 DECL_ATTRIBUTES (olddecl)))
2035 && (!DECL_DECLARED_INLINE_P (newdecl)
2036 || !lookup_attribute ("gnu_inline",
2037 DECL_ATTRIBUTES (newdecl))))
2039 && same_translation_unit_p (newdecl, olddecl))
2041 error ("redefinition of %q+D", newdecl);
2042 locate_old_decl (olddecl);
2047 /* If we have a prototype after an old-style function definition,
2048 the argument types must be checked specially. */
2049 else if (DECL_INITIAL (olddecl)
2050 && !prototype_p (oldtype) && prototype_p (newtype)
2051 && TYPE_ACTUAL_ARG_TYPES (oldtype)
2052 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
2054 locate_old_decl (olddecl);
2057 /* A non-static declaration (even an "extern") followed by a
2058 static declaration is undefined behavior per C99 6.2.2p3-5,7.
2059 The same is true for a static forward declaration at block
2060 scope followed by a non-static declaration/definition at file
2061 scope. Static followed by non-static at the same scope is
2062 not undefined behavior, and is the most convenient way to get
2063 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
2064 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
2065 we do diagnose it if -Wtraditional. */
2066 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
2068 /* Two exceptions to the rule. If olddecl is an extern
2069 inline, or a predeclared function that isn't actually
2070 built in, newdecl silently overrides olddecl. The latter
2071 occur only in Objective C; see also above. (FIXME: Make
2072 Objective C use normal builtins.) */
2073 if (!DECL_IS_BUILTIN (olddecl)
2074 && !DECL_EXTERN_INLINE (olddecl))
2076 error ("static declaration of %q+D follows "
2077 "non-static declaration", newdecl);
2078 locate_old_decl (olddecl);
2082 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
2084 if (DECL_CONTEXT (olddecl))
2086 error ("non-static declaration of %q+D follows "
2087 "static declaration", newdecl);
2088 locate_old_decl (olddecl);
2091 else if (warn_traditional)
2093 warned |= warning (OPT_Wtraditional,
2094 "non-static declaration of %q+D "
2095 "follows static declaration", newdecl);
2099 /* Make sure gnu_inline attribute is either not present, or
2100 present on all inline decls. */
2101 if (DECL_DECLARED_INLINE_P (olddecl)
2102 && DECL_DECLARED_INLINE_P (newdecl))
2104 bool newa = lookup_attribute ("gnu_inline",
2105 DECL_ATTRIBUTES (newdecl)) != NULL;
2106 bool olda = lookup_attribute ("gnu_inline",
2107 DECL_ATTRIBUTES (olddecl)) != NULL;
2110 error_at (input_location, "%<gnu_inline%> attribute present on %q+D",
2111 newa ? newdecl : olddecl);
2112 error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl),
2117 else if (VAR_P (newdecl))
2119 /* Only variables can be thread-local, and all declarations must
2120 agree on this property. */
2121 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
2123 /* Nothing to check. Since OLDDECL is marked threadprivate
2124 and NEWDECL does not have a thread-local attribute, we
2125 will merge the threadprivate attribute into NEWDECL. */
2128 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
2130 if (DECL_THREAD_LOCAL_P (newdecl))
2131 error ("thread-local declaration of %q+D follows "
2132 "non-thread-local declaration", newdecl);
2134 error ("non-thread-local declaration of %q+D follows "
2135 "thread-local declaration", newdecl);
2137 locate_old_decl (olddecl);
2141 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2142 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
2144 error ("redefinition of %q+D", newdecl);
2145 locate_old_decl (olddecl);
2149 /* Objects declared at file scope: if the first declaration had
2150 external linkage (even if it was an external reference) the
2151 second must have external linkage as well, or the behavior is
2152 undefined. If the first declaration had internal linkage, then
2153 the second must too, or else be an external reference (in which
2154 case the composite declaration still has internal linkage).
2155 As for function declarations, we warn about the static-then-
2156 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2157 if (DECL_FILE_SCOPE_P (newdecl)
2158 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
2160 if (DECL_EXTERNAL (newdecl))
2162 if (!DECL_FILE_SCOPE_P (olddecl))
2164 error ("extern declaration of %q+D follows "
2165 "declaration with no linkage", newdecl);
2166 locate_old_decl (olddecl);
2169 else if (warn_traditional)
2171 warned |= warning (OPT_Wtraditional,
2172 "non-static declaration of %q+D "
2173 "follows static declaration", newdecl);
2178 if (TREE_PUBLIC (newdecl))
2179 error ("non-static declaration of %q+D follows "
2180 "static declaration", newdecl);
2182 error ("static declaration of %q+D follows "
2183 "non-static declaration", newdecl);
2185 locate_old_decl (olddecl);
2189 /* Two objects with the same name declared at the same block
2190 scope must both be external references (6.7p3). */
2191 else if (!DECL_FILE_SCOPE_P (newdecl))
2193 if (DECL_EXTERNAL (newdecl))
2195 /* Extern with initializer at block scope, which will
2196 already have received an error. */
2198 else if (DECL_EXTERNAL (olddecl))
2200 error ("declaration of %q+D with no linkage follows "
2201 "extern declaration", newdecl);
2202 locate_old_decl (olddecl);
2206 error ("redeclaration of %q+D with no linkage", newdecl);
2207 locate_old_decl (olddecl);
2213 /* C++ does not permit a decl to appear multiple times at file
2216 && DECL_FILE_SCOPE_P (newdecl)
2217 && !DECL_EXTERNAL (newdecl)
2218 && !DECL_EXTERNAL (olddecl))
2219 warned |= warning_at (DECL_SOURCE_LOCATION (newdecl),
2221 ("duplicate declaration of %qD is "
2227 /* All decls must agree on a visibility. */
2228 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
2229 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
2230 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2232 warned |= warning (0, "redeclaration of %q+D with different visibility "
2233 "(old visibility preserved)", newdecl);
2236 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2238 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2239 if (DECL_DECLARED_INLINE_P (newdecl)
2240 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2241 warned |= warning (OPT_Wattributes,
2242 "inline declaration of %qD follows "
2243 "declaration with attribute noinline", newdecl);
2244 else if (DECL_DECLARED_INLINE_P (olddecl)
2245 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
2246 warned |= warning (OPT_Wattributes,
2247 "declaration of %q+D with attribute "
2248 "noinline follows inline declaration ", newdecl);
2249 else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl))
2250 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl)))
2251 warned |= warning (OPT_Wattributes,
2252 "declaration of %q+D with attribute "
2253 "%qs follows declaration with attribute %qs",
2254 newdecl, "noinline", "always_inline");
2255 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl))
2256 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2257 warned |= warning (OPT_Wattributes,
2258 "declaration of %q+D with attribute "
2259 "%qs follows declaration with attribute %qs",
2260 newdecl, "always_inline", "noinline");
2261 else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl))
2262 && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl)))
2263 warned |= warning (OPT_Wattributes,
2264 "declaration of %q+D with attribute %qs follows "
2265 "declaration with attribute %qs", newdecl, "cold",
2267 else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl))
2268 && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl)))
2269 warned |= warning (OPT_Wattributes,
2270 "declaration of %q+D with attribute %qs follows "
2271 "declaration with attribute %qs", newdecl, "hot",
2274 else /* PARM_DECL, VAR_DECL */
2276 /* Redeclaration of a parameter is a constraint violation (this is
2277 not explicitly stated, but follows from C99 6.7p3 [no more than
2278 one declaration of the same identifier with no linkage in the
2279 same scope, except type tags] and 6.2.2p6 [parameters have no
2280 linkage]). We must check for a forward parameter declaration,
2281 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2282 an extension, the mandatory diagnostic for which is handled by
2283 mark_forward_parm_decls. */
2285 if (TREE_CODE (newdecl) == PARM_DECL
2286 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
2288 error ("redefinition of parameter %q+D", newdecl);
2289 locate_old_decl (olddecl);
2294 /* Optional warning for completely redundant decls. */
2295 if (!warned && !pedwarned
2296 && warn_redundant_decls
2297 /* Don't warn about a function declaration followed by a
2299 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2300 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
2301 /* Don't warn about redundant redeclarations of builtins. */
2302 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2303 && !DECL_BUILT_IN (newdecl)
2304 && DECL_BUILT_IN (olddecl)
2305 && !C_DECL_DECLARED_BUILTIN (olddecl))
2306 /* Don't warn about an extern followed by a definition. */
2307 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
2308 /* Don't warn about forward parameter decls. */
2309 && !(TREE_CODE (newdecl) == PARM_DECL
2310 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2311 /* Don't warn about a variable definition following a declaration. */
2312 && !(VAR_P (newdecl)
2313 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
2315 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
2319 /* Report location of previous decl/defn. */
2320 if (warned || pedwarned)
2321 locate_old_decl (olddecl);
2323 #undef DECL_EXTERN_INLINE
2328 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2329 consistent with OLDDECL, but carries new information. Merge the
2330 new information into OLDDECL. This function issues no
2334 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
2336 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
2337 && DECL_INITIAL (newdecl) != 0);
2338 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
2339 && prototype_p (TREE_TYPE (newdecl)));
2340 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
2341 && prototype_p (TREE_TYPE (olddecl)));
2343 /* For real parm decl following a forward decl, rechain the old decl
2344 in its new location and clear TREE_ASM_WRITTEN (it's not a
2345 forward decl anymore). */
2346 if (TREE_CODE (newdecl) == PARM_DECL
2347 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2349 struct c_binding *b, **here;
2351 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
2352 if ((*here)->decl == olddecl)
2359 b->prev = current_scope->bindings;
2360 current_scope->bindings = b;
2362 TREE_ASM_WRITTEN (olddecl) = 0;
2365 DECL_ATTRIBUTES (newdecl)
2366 = targetm.merge_decl_attributes (olddecl, newdecl);
2368 /* Merge the data types specified in the two decls. */
2370 = TREE_TYPE (olddecl)
2371 = composite_type (newtype, oldtype);
2373 /* Lay the type out, unless already done. */
2374 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
2376 if (TREE_TYPE (newdecl) != error_mark_node)
2377 layout_type (TREE_TYPE (newdecl));
2378 if (TREE_CODE (newdecl) != FUNCTION_DECL
2379 && TREE_CODE (newdecl) != TYPE_DECL
2380 && TREE_CODE (newdecl) != CONST_DECL)
2381 layout_decl (newdecl, 0);
2385 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2386 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
2387 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
2388 DECL_MODE (newdecl) = DECL_MODE (olddecl);
2389 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2391 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2392 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2396 /* Keep the old rtl since we can safely use it. */
2397 if (HAS_RTL_P (olddecl))
2398 COPY_DECL_RTL (olddecl, newdecl);
2400 /* Merge the type qualifiers. */
2401 if (TREE_READONLY (newdecl))
2402 TREE_READONLY (olddecl) = 1;
2404 if (TREE_THIS_VOLATILE (newdecl))
2405 TREE_THIS_VOLATILE (olddecl) = 1;
2407 /* Merge deprecatedness. */
2408 if (TREE_DEPRECATED (newdecl))
2409 TREE_DEPRECATED (olddecl) = 1;
2411 /* If a decl is in a system header and the other isn't, keep the one on the
2412 system header. Otherwise, keep source location of definition rather than
2413 declaration and of prototype rather than non-prototype unless that
2414 prototype is built-in. */
2415 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2416 && DECL_IN_SYSTEM_HEADER (olddecl)
2417 && !DECL_IN_SYSTEM_HEADER (newdecl) )
2418 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2419 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2420 && DECL_IN_SYSTEM_HEADER (newdecl)
2421 && !DECL_IN_SYSTEM_HEADER (olddecl))
2422 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
2423 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
2424 || (old_is_prototype && !new_is_prototype
2425 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
2426 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2428 /* Merge the initialization information. */
2429 if (DECL_INITIAL (newdecl) == 0)
2430 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2432 /* Merge the threadprivate attribute. */
2433 if (VAR_P (olddecl) && C_DECL_THREADPRIVATE_P (olddecl))
2434 C_DECL_THREADPRIVATE_P (newdecl) = 1;
2436 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
2438 /* Copy the assembler name.
2439 Currently, it can only be defined in the prototype. */
2440 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2442 /* Use visibility of whichever declaration had it specified */
2443 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2445 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2446 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2449 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2451 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2452 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2453 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2454 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2455 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2456 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2457 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2458 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2459 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2460 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2461 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
2464 /* Merge the storage class information. */
2465 merge_weak (newdecl, olddecl);
2467 /* For functions, static overrides non-static. */
2468 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2470 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2471 /* This is since we don't automatically
2472 copy the attributes of NEWDECL into OLDDECL. */
2473 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2474 /* If this clears `static', clear it in the identifier too. */
2475 if (!TREE_PUBLIC (olddecl))
2476 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2480 /* In c99, 'extern' declaration before (or after) 'inline' means this
2481 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2483 if (TREE_CODE (newdecl) == FUNCTION_DECL
2484 && !flag_gnu89_inline
2485 && (DECL_DECLARED_INLINE_P (newdecl)
2486 || DECL_DECLARED_INLINE_P (olddecl))
2487 && (!DECL_DECLARED_INLINE_P (newdecl)
2488 || !DECL_DECLARED_INLINE_P (olddecl)
2489 || !DECL_EXTERNAL (olddecl))
2490 && DECL_EXTERNAL (newdecl)
2491 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
2492 && !current_function_decl)
2493 DECL_EXTERNAL (newdecl) = 0;
2495 /* An inline definition following a static declaration is not
2497 if (new_is_definition
2498 && (DECL_DECLARED_INLINE_P (newdecl)
2499 || DECL_DECLARED_INLINE_P (olddecl))
2500 && !TREE_PUBLIC (olddecl))
2501 DECL_EXTERNAL (newdecl) = 0;
2503 if (DECL_EXTERNAL (newdecl))
2505 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2506 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2508 /* An extern decl does not override previous storage class. */
2509 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2510 if (!DECL_EXTERNAL (newdecl))
2512 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2513 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2518 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2519 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2522 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2524 /* If we're redefining a function previously defined as extern
2525 inline, make sure we emit debug info for the inline before we
2526 throw it away, in case it was inlined into a function that
2527 hasn't been written out yet. */
2528 if (new_is_definition && DECL_INITIAL (olddecl))
2529 /* The new defn must not be inline. */
2530 DECL_UNINLINABLE (newdecl) = 1;
2533 /* If either decl says `inline', this fn is inline, unless
2534 its definition was passed already. */
2535 if (DECL_DECLARED_INLINE_P (newdecl)
2536 || DECL_DECLARED_INLINE_P (olddecl))
2537 DECL_DECLARED_INLINE_P (newdecl) = 1;
2539 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2540 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2542 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2543 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2544 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2545 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2548 if (DECL_BUILT_IN (olddecl))
2550 /* If redeclaring a builtin function, it stays built in.
2551 But it gets tagged as having been declared. */
2552 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2553 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2554 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
2555 if (new_is_prototype)
2557 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
2558 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2560 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2563 /* If a compatible prototype of these builtin functions
2564 is seen, assume the runtime implements it with the
2565 expected semantics. */
2566 case BUILT_IN_STPCPY:
2567 if (builtin_decl_explicit_p (fncode))
2568 set_builtin_decl_implicit_p (fncode, true);
2571 if (builtin_decl_explicit_p (fncode))
2572 set_builtin_decl_declared_p (fncode, true);
2578 C_DECL_BUILTIN_PROTOTYPE (newdecl)
2579 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
2582 /* Preserve function specific target and optimization options */
2583 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2584 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2585 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2586 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2588 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2589 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2590 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2591 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2593 /* Also preserve various other info from the definition. */
2594 if (!new_is_definition)
2597 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2598 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2599 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2600 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2601 DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl));
2602 for (t = DECL_ARGUMENTS (newdecl); t ; t = DECL_CHAIN (t))
2603 DECL_CONTEXT (t) = newdecl;
2605 /* See if we've got a function to instantiate from. */
2606 if (DECL_SAVED_TREE (olddecl))
2607 DECL_ABSTRACT_ORIGIN (newdecl)
2608 = DECL_ABSTRACT_ORIGIN (olddecl);
2612 /* Merge the USED information. */
2613 if (TREE_USED (olddecl))
2614 TREE_USED (newdecl) = 1;
2615 else if (TREE_USED (newdecl))
2616 TREE_USED (olddecl) = 1;
2617 if (VAR_P (olddecl) || TREE_CODE (olddecl) == PARM_DECL)
2618 DECL_READ_P (newdecl) |= DECL_READ_P (olddecl);
2619 if (DECL_PRESERVE_P (olddecl))
2620 DECL_PRESERVE_P (newdecl) = 1;
2621 else if (DECL_PRESERVE_P (newdecl))
2622 DECL_PRESERVE_P (olddecl) = 1;
2624 /* Merge DECL_COMMON */
2625 if (VAR_P (olddecl) && VAR_P (newdecl)
2626 && !lookup_attribute ("common", DECL_ATTRIBUTES (newdecl))
2627 && !lookup_attribute ("nocommon", DECL_ATTRIBUTES (newdecl)))
2628 DECL_COMMON (newdecl) = DECL_COMMON (newdecl) && DECL_COMMON (olddecl);
2630 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2631 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2632 DECL_ARGUMENTS (if appropriate). */
2634 unsigned olddecl_uid = DECL_UID (olddecl);
2635 tree olddecl_context = DECL_CONTEXT (olddecl);
2636 tree olddecl_arguments = NULL;
2637 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2638 olddecl_arguments = DECL_ARGUMENTS (olddecl);
2640 memcpy ((char *) olddecl + sizeof (struct tree_common),
2641 (char *) newdecl + sizeof (struct tree_common),
2642 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2643 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2644 switch (TREE_CODE (olddecl))
2649 struct symtab_node *snode = olddecl->decl_with_vis.symtab_node;
2651 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2652 (char *) newdecl + sizeof (struct tree_decl_common),
2653 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2654 olddecl->decl_with_vis.symtab_node = snode;
2656 if ((DECL_EXTERNAL (olddecl)
2657 || TREE_PUBLIC (olddecl)
2658 || TREE_STATIC (olddecl))
2659 && DECL_SECTION_NAME (newdecl) != NULL)
2660 set_decl_section_name (olddecl, DECL_SECTION_NAME (newdecl));
2662 /* This isn't quite correct for something like
2663 int __thread x attribute ((tls_model ("local-exec")));
2664 extern int __thread x;
2665 as we'll lose the "local-exec" model. */
2666 if (VAR_P (olddecl) && DECL_THREAD_LOCAL_P (newdecl))
2667 set_decl_tls_model (olddecl, DECL_TLS_MODEL (newdecl));
2677 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2678 (char *) newdecl + sizeof (struct tree_decl_common),
2679 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2684 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2685 (char *) newdecl + sizeof (struct tree_decl_common),
2686 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
2688 DECL_UID (olddecl) = olddecl_uid;
2689 DECL_CONTEXT (olddecl) = olddecl_context;
2690 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2691 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
2694 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2695 so that encode_section_info has a chance to look at the new decl
2696 flags and attributes. */
2697 if (DECL_RTL_SET_P (olddecl)
2698 && (TREE_CODE (olddecl) == FUNCTION_DECL
2699 || (VAR_P (olddecl) && TREE_STATIC (olddecl))))
2700 make_decl_rtl (olddecl);
2703 /* Handle when a new declaration NEWDECL has the same name as an old
2704 one OLDDECL in the same binding contour. Prints an error message
2707 If safely possible, alter OLDDECL to look like NEWDECL, and return
2708 true. Otherwise, return false. */
2711 duplicate_decls (tree newdecl, tree olddecl)
2713 tree newtype = NULL, oldtype = NULL;
2715 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
2717 /* Avoid `unused variable' and other warnings for OLDDECL. */
2718 TREE_NO_WARNING (olddecl) = 1;
2722 merge_decls (newdecl, olddecl, newtype, oldtype);
2724 /* The NEWDECL will no longer be needed.
2726 Before releasing the node, be sure to remove function from symbol
2727 table that might have been inserted there to record comdat group.
2728 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2729 structure is shared in between NEWDECL and OLDECL. */
2730 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2731 DECL_STRUCT_FUNCTION (newdecl) = NULL;
2732 if (VAR_OR_FUNCTION_DECL_P (newdecl))
2734 struct symtab_node *snode = symtab_node::get (newdecl);
2743 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2745 warn_if_shadowing (tree new_decl)
2747 struct c_binding *b;
2749 /* Shadow warnings wanted? */
2751 /* No shadow warnings for internally generated vars. */
2752 || DECL_IS_BUILTIN (new_decl)
2753 /* No shadow warnings for vars made for inlining. */
2754 || DECL_FROM_INLINE (new_decl))
2757 /* Is anything being shadowed? Invisible decls do not count. */
2758 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
2759 if (b->decl && b->decl != new_decl && !b->invisible
2760 && (b->decl == error_mark_node
2761 || diagnostic_report_warnings_p (global_dc,
2762 DECL_SOURCE_LOCATION (b->decl))))
2764 tree old_decl = b->decl;
2765 bool warned = false;
2767 if (old_decl == error_mark_node)
2769 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
2770 "non-variable", new_decl);
2773 else if (TREE_CODE (old_decl) == PARM_DECL)
2774 warned = warning (OPT_Wshadow,
2775 "declaration of %q+D shadows a parameter",
2777 else if (DECL_FILE_SCOPE_P (old_decl))
2779 /* Do not warn if a variable shadows a function, unless
2780 the variable is a function or a pointer-to-function. */
2781 if (TREE_CODE (old_decl) == FUNCTION_DECL
2782 && TREE_CODE (new_decl) != FUNCTION_DECL
2783 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl)))
2786 warned = warning_at (DECL_SOURCE_LOCATION (new_decl), OPT_Wshadow,
2787 "declaration of %qD shadows a global "
2791 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2792 && DECL_BUILT_IN (old_decl))
2794 warning (OPT_Wshadow, "declaration of %q+D shadows "
2795 "a built-in function", new_decl);
2799 warned = warning (OPT_Wshadow, "declaration of %q+D shadows a "
2800 "previous local", new_decl);
2803 inform (DECL_SOURCE_LOCATION (old_decl),
2804 "shadowed declaration is here");
2810 /* Record a decl-node X as belonging to the current lexical scope.
2811 Check for errors (such as an incompatible declaration for the same
2812 name already seen in the same scope).
2814 Returns either X or an old decl for the same name.
2815 If an old decl is returned, it may have been smashed
2816 to agree with what X says. */
2821 tree name = DECL_NAME (x);
2822 struct c_scope *scope = current_scope;
2823 struct c_binding *b;
2824 bool nested = false;
2825 location_t locus = DECL_SOURCE_LOCATION (x);
2827 /* Must set DECL_CONTEXT for everything not at file scope or
2828 DECL_FILE_SCOPE_P won't work. Local externs don't count
2829 unless they have initializers (which generate code). */
2830 if (current_function_decl
2831 && (!VAR_OR_FUNCTION_DECL_P (x)
2832 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2833 DECL_CONTEXT (x) = current_function_decl;
2835 /* Anonymous decls are just inserted in the scope. */
2838 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
2843 /* First, see if there is another declaration with the same name in
2844 the current scope. If there is, duplicate_decls may do all the
2845 work for us. If duplicate_decls returns false, that indicates
2846 two incompatible decls in the same scope; we are to silently
2847 replace the old one (duplicate_decls has issued all appropriate
2848 diagnostics). In particular, we should not consider possible
2849 duplicates in the external scope, or shadowing. */
2850 b = I_SYMBOL_BINDING (name);
2851 if (b && B_IN_SCOPE (b, scope))
2853 struct c_binding *b_ext, *b_use;
2854 tree type = TREE_TYPE (x);
2855 tree visdecl = b->decl;
2856 tree vistype = TREE_TYPE (visdecl);
2857 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2858 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2859 b->inner_comp = false;
2862 /* If this is an external linkage declaration, we should check
2863 for compatibility with the type in the external scope before
2864 setting the type at this scope based on the visible
2865 information only. */
2866 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2868 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2869 b_ext = b_ext->shadowed;
2874 TREE_TYPE (b_use->decl) = b_use->u.type;
2877 if (duplicate_decls (x, b_use->decl))
2881 /* Save the updated type in the external scope and
2882 restore the proper type for this scope. */
2884 if (comptypes (vistype, type))
2885 thistype = composite_type (vistype, type);
2887 thistype = TREE_TYPE (b_use->decl);
2888 b_use->u.type = TREE_TYPE (b_use->decl);
2889 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2890 && DECL_BUILT_IN (b_use->decl))
2892 = build_type_attribute_variant (thistype,
2895 TREE_TYPE (b_use->decl) = thistype;
2900 goto skip_external_and_shadow_checks;
2903 /* All declarations with external linkage, and all external
2904 references, go in the external scope, no matter what scope is
2905 current. However, the binding in that scope is ignored for
2906 purposes of normal name lookup. A separate binding structure is
2907 created in the requested scope; this governs the normal
2908 visibility of the symbol.
2910 The binding in the externals scope is used exclusively for
2911 detecting duplicate declarations of the same object, no matter
2912 what scope they are in; this is what we do here. (C99 6.2.7p2:
2913 All declarations that refer to the same object or function shall
2914 have compatible type; otherwise, the behavior is undefined.) */
2915 if (DECL_EXTERNAL (x) || scope == file_scope)
2917 tree type = TREE_TYPE (x);
2920 bool type_saved = false;
2921 if (b && !B_IN_EXTERNAL_SCOPE (b)
2922 && VAR_OR_FUNCTION_DECL_P (b->decl)
2923 && DECL_FILE_SCOPE_P (b->decl))
2926 vistype = TREE_TYPE (visdecl);
2928 if (scope != file_scope
2929 && !DECL_IN_SYSTEM_HEADER (x))
2930 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2932 while (b && !B_IN_EXTERNAL_SCOPE (b))
2934 /* If this decl might be modified, save its type. This is
2935 done here rather than when the decl is first bound
2936 because the type may change after first binding, through
2937 being completed or through attributes being added. If we
2938 encounter multiple such decls, only the first should have
2939 its type saved; the others will already have had their
2940 proper types saved and the types will not have changed as
2941 their scopes will not have been re-entered. */
2942 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2944 b->u.type = TREE_TYPE (b->decl);
2947 if (B_IN_FILE_SCOPE (b)
2949 && TREE_STATIC (b->decl)
2950 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2951 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2952 && TREE_CODE (type) == ARRAY_TYPE
2953 && TYPE_DOMAIN (type)
2954 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2955 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2957 /* Array type completed in inner scope, which should be
2958 diagnosed if the completion does not have size 1 and
2959 it does not get completed in the file scope. */
2960 b->inner_comp = true;
2965 /* If a matching external declaration has been found, set its
2966 type to the composite of all the types of that declaration.
2967 After the consistency checks, it will be reset to the
2968 composite of the visible types only. */
2969 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2971 TREE_TYPE (b->decl) = b->u.type;
2973 /* The point of the same_translation_unit_p check here is,
2974 we want to detect a duplicate decl for a construct like
2975 foo() { extern bar(); } ... static bar(); but not if
2976 they are in different translation units. In any case,
2977 the static does not go in the externals scope. */
2979 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2980 && duplicate_decls (x, b->decl))
2985 if (comptypes (vistype, type))
2986 thistype = composite_type (vistype, type);
2988 thistype = TREE_TYPE (b->decl);
2992 b->u.type = TREE_TYPE (b->decl);
2993 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2995 = build_type_attribute_variant (thistype,
2996 TYPE_ATTRIBUTES (b->u.type));
2997 TREE_TYPE (b->decl) = thistype;
2998 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
3002 else if (TREE_PUBLIC (x))
3004 if (visdecl && !b && duplicate_decls (x, visdecl))
3006 /* An external declaration at block scope referring to a
3007 visible entity with internal linkage. The composite
3008 type will already be correct for this scope, so we
3009 just need to fall through to make the declaration in
3016 bind (name, x, external_scope, /*invisible=*/true,
3017 /*nested=*/false, locus);
3023 if (TREE_CODE (x) != PARM_DECL)
3024 warn_if_shadowing (x);
3026 skip_external_and_shadow_checks:
3027 if (TREE_CODE (x) == TYPE_DECL)
3029 /* So this is a typedef, set its underlying type. */
3030 set_underlying_type (x);
3032 /* If X is a typedef defined in the current function, record it
3033 for the purpose of implementing the -Wunused-local-typedefs
3035 record_locally_defined_typedef (x);
3038 bind (name, x, scope, /*invisible=*/false, nested, locus);
3040 /* If x's type is incomplete because it's based on a
3041 structure or union which has not yet been fully declared,
3042 attach it to that structure or union type, so we can go
3043 back and complete the variable declaration later, if the
3044 structure or union gets fully declared.
3046 If the input is erroneous, we can have error_mark in the type
3047 slot (e.g. "f(void a, ...)") - that doesn't count as an
3049 if (TREE_TYPE (x) != error_mark_node
3050 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
3052 tree element = TREE_TYPE (x);
3054 while (TREE_CODE (element) == ARRAY_TYPE)
3055 element = TREE_TYPE (element);
3056 element = TYPE_MAIN_VARIANT (element);
3058 if ((TREE_CODE (element) == RECORD_TYPE
3059 || TREE_CODE (element) == UNION_TYPE)
3060 && (TREE_CODE (x) != TYPE_DECL
3061 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
3062 && !COMPLETE_TYPE_P (element))
3063 C_TYPE_INCOMPLETE_VARS (element)
3064 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
3069 /* Record X as belonging to file scope.
3070 This is used only internally by the Objective-C front end,
3071 and is limited to its needs. duplicate_decls is not called;
3072 if there is any preexisting decl for this identifier, it is an ICE. */
3075 pushdecl_top_level (tree x)
3078 bool nested = false;
3079 gcc_assert (VAR_P (x) || TREE_CODE (x) == CONST_DECL);
3081 name = DECL_NAME (x);
3083 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
3085 if (TREE_PUBLIC (x))
3087 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false,
3092 bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION);
3098 implicit_decl_warning (location_t loc, tree id, tree olddecl)
3100 if (warn_implicit_function_declaration)
3105 warned = pedwarn (loc, OPT_Wimplicit_function_declaration,
3106 "implicit declaration of function %qE", id);
3108 warned = warning_at (loc, OPT_Wimplicit_function_declaration,
3109 G_("implicit declaration of function %qE"), id);
3110 if (olddecl && warned)
3111 locate_old_decl (olddecl);
3115 /* This function represents mapping of a function code FCODE
3116 to its respective header. */
3119 header_for_builtin_fn (enum built_in_function fcode)
3123 CASE_FLT_FN (BUILT_IN_ACOS):
3124 CASE_FLT_FN (BUILT_IN_ACOSH):
3125 CASE_FLT_FN (BUILT_IN_ASIN):
3126 CASE_FLT_FN (BUILT_IN_ASINH):
3127 CASE_FLT_FN (BUILT_IN_ATAN):
3128 CASE_FLT_FN (BUILT_IN_ATANH):
3129 CASE_FLT_FN (BUILT_IN_ATAN2):
3130 CASE_FLT_FN (BUILT_IN_CBRT):
3131 CASE_FLT_FN (BUILT_IN_CEIL):
3132 CASE_FLT_FN (BUILT_IN_COPYSIGN):
3133 CASE_FLT_FN (BUILT_IN_COS):
3134 CASE_FLT_FN (BUILT_IN_COSH):
3135 CASE_FLT_FN (BUILT_IN_ERF):
3136 CASE_FLT_FN (BUILT_IN_ERFC):
3137 CASE_FLT_FN (BUILT_IN_EXP):
3138 CASE_FLT_FN (BUILT_IN_EXP2):
3139 CASE_FLT_FN (BUILT_IN_EXPM1):
3140 CASE_FLT_FN (BUILT_IN_FABS):
3141 CASE_FLT_FN (BUILT_IN_FDIM):
3142 CASE_FLT_FN (BUILT_IN_FLOOR):
3143 CASE_FLT_FN (BUILT_IN_FMA):
3144 CASE_FLT_FN (BUILT_IN_FMAX):
3145 CASE_FLT_FN (BUILT_IN_FMIN):
3146 CASE_FLT_FN (BUILT_IN_FMOD):
3147 CASE_FLT_FN (BUILT_IN_FREXP):
3148 CASE_FLT_FN (BUILT_IN_HYPOT):
3149 CASE_FLT_FN (BUILT_IN_ILOGB):
3150 CASE_FLT_FN (BUILT_IN_LDEXP):
3151 CASE_FLT_FN (BUILT_IN_LGAMMA):
3152 CASE_FLT_FN (BUILT_IN_LLRINT):
3153 CASE_FLT_FN (BUILT_IN_LLROUND):
3154 CASE_FLT_FN (BUILT_IN_LOG):
3155 CASE_FLT_FN (BUILT_IN_LOG10):
3156 CASE_FLT_FN (BUILT_IN_LOG1P):
3157 CASE_FLT_FN (BUILT_IN_LOG2):
3158 CASE_FLT_FN (BUILT_IN_LOGB):
3159 CASE_FLT_FN (BUILT_IN_LRINT):
3160 CASE_FLT_FN (BUILT_IN_LROUND):
3161 CASE_FLT_FN (BUILT_IN_MODF):
3162 CASE_FLT_FN (BUILT_IN_NAN):
3163 CASE_FLT_FN (BUILT_IN_NEARBYINT):
3164 CASE_FLT_FN (BUILT_IN_NEXTAFTER):
3165 CASE_FLT_FN (BUILT_IN_NEXTTOWARD):
3166 CASE_FLT_FN (BUILT_IN_POW):
3167 CASE_FLT_FN (BUILT_IN_REMAINDER):
3168 CASE_FLT_FN (BUILT_IN_REMQUO):
3169 CASE_FLT_FN (BUILT_IN_RINT):
3170 CASE_FLT_FN (BUILT_IN_ROUND):
3171 CASE_FLT_FN (BUILT_IN_SCALBLN):
3172 CASE_FLT_FN (BUILT_IN_SCALBN):
3173 CASE_FLT_FN (BUILT_IN_SIN):
3174 CASE_FLT_FN (BUILT_IN_SINH):
3175 CASE_FLT_FN (BUILT_IN_SINCOS):
3176 CASE_FLT_FN (BUILT_IN_SQRT):
3177 CASE_FLT_FN (BUILT_IN_TAN):
3178 CASE_FLT_FN (BUILT_IN_TANH):
3179 CASE_FLT_FN (BUILT_IN_TGAMMA):
3180 CASE_FLT_FN (BUILT_IN_TRUNC):
3181 case BUILT_IN_ISINF:
3182 case BUILT_IN_ISNAN:
3184 CASE_FLT_FN (BUILT_IN_CABS):
3185 CASE_FLT_FN (BUILT_IN_CACOS):
3186 CASE_FLT_FN (BUILT_IN_CACOSH):
3187 CASE_FLT_FN (BUILT_IN_CARG):
3188 CASE_FLT_FN (BUILT_IN_CASIN):
3189 CASE_FLT_FN (BUILT_IN_CASINH):
3190 CASE_FLT_FN (BUILT_IN_CATAN):
3191 CASE_FLT_FN (BUILT_IN_CATANH):
3192 CASE_FLT_FN (BUILT_IN_CCOS):
3193 CASE_FLT_FN (BUILT_IN_CCOSH):
3194 CASE_FLT_FN (BUILT_IN_CEXP):
3195 CASE_FLT_FN (BUILT_IN_CIMAG):
3196 CASE_FLT_FN (BUILT_IN_CLOG):
3197 CASE_FLT_FN (BUILT_IN_CONJ):
3198 CASE_FLT_FN (BUILT_IN_CPOW):
3199 CASE_FLT_FN (BUILT_IN_CPROJ):
3200 CASE_FLT_FN (BUILT_IN_CREAL):
3201 CASE_FLT_FN (BUILT_IN_CSIN):
3202 CASE_FLT_FN (BUILT_IN_CSINH):
3203 CASE_FLT_FN (BUILT_IN_CSQRT):
3204 CASE_FLT_FN (BUILT_IN_CTAN):
3205 CASE_FLT_FN (BUILT_IN_CTANH):
3206 return "<complex.h>";
3207 case BUILT_IN_MEMCHR:
3208 case BUILT_IN_MEMCMP:
3209 case BUILT_IN_MEMCPY:
3210 case BUILT_IN_MEMMOVE:
3211 case BUILT_IN_MEMSET:
3212 case BUILT_IN_STRCAT:
3213 case BUILT_IN_STRCHR:
3214 case BUILT_IN_STRCMP:
3215 case BUILT_IN_STRCPY:
3216 case BUILT_IN_STRCSPN:
3217 case BUILT_IN_STRLEN:
3218 case BUILT_IN_STRNCAT:
3219 case BUILT_IN_STRNCMP:
3220 case BUILT_IN_STRNCPY:
3221 case BUILT_IN_STRPBRK:
3222 case BUILT_IN_STRRCHR:
3223 case BUILT_IN_STRSPN:
3224 case BUILT_IN_STRSTR:
3225 return "<string.h>";
3226 case BUILT_IN_FPRINTF:
3228 case BUILT_IN_FPUTC:
3229 case BUILT_IN_FPUTS:
3230 case BUILT_IN_FSCANF:
3231 case BUILT_IN_FWRITE:
3232 case BUILT_IN_PRINTF:
3233 case BUILT_IN_PUTCHAR:
3235 case BUILT_IN_SCANF:
3236 case BUILT_IN_SNPRINTF:
3237 case BUILT_IN_SPRINTF:
3238 case BUILT_IN_SSCANF:
3239 case BUILT_IN_VFPRINTF:
3240 case BUILT_IN_VFSCANF:
3241 case BUILT_IN_VPRINTF:
3242 case BUILT_IN_VSCANF:
3243 case BUILT_IN_VSNPRINTF:
3244 case BUILT_IN_VSPRINTF:
3245 case BUILT_IN_VSSCANF:
3247 case BUILT_IN_ISALNUM:
3248 case BUILT_IN_ISALPHA:
3249 case BUILT_IN_ISBLANK:
3250 case BUILT_IN_ISCNTRL:
3251 case BUILT_IN_ISDIGIT:
3252 case BUILT_IN_ISGRAPH:
3253 case BUILT_IN_ISLOWER:
3254 case BUILT_IN_ISPRINT:
3255 case BUILT_IN_ISPUNCT:
3256 case BUILT_IN_ISSPACE:
3257 case BUILT_IN_ISUPPER:
3258 case BUILT_IN_ISXDIGIT:
3259 case BUILT_IN_TOLOWER:
3260 case BUILT_IN_TOUPPER:
3262 case BUILT_IN_ISWALNUM:
3263 case BUILT_IN_ISWALPHA:
3264 case BUILT_IN_ISWBLANK:
3265 case BUILT_IN_ISWCNTRL:
3266 case BUILT_IN_ISWDIGIT:
3267 case BUILT_IN_ISWGRAPH:
3268 case BUILT_IN_ISWLOWER:
3269 case BUILT_IN_ISWPRINT:
3270 case BUILT_IN_ISWPUNCT:
3271 case BUILT_IN_ISWSPACE:
3272 case BUILT_IN_ISWUPPER:
3273 case BUILT_IN_ISWXDIGIT:
3274 case BUILT_IN_TOWLOWER:
3275 case BUILT_IN_TOWUPPER:
3276 return "<wctype.h>";
3277 case BUILT_IN_ABORT:
3279 case BUILT_IN_CALLOC:
3283 case BUILT_IN_LLABS:
3284 case BUILT_IN_MALLOC:
3285 case BUILT_IN_REALLOC:
3286 case BUILT_IN__EXIT2:
3287 case BUILT_IN_ALIGNED_ALLOC:
3288 return "<stdlib.h>";
3289 case BUILT_IN_IMAXABS:
3290 return "<inttypes.h>";
3291 case BUILT_IN_STRFTIME:
3298 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
3299 function of type int (). */
3302 implicitly_declare (location_t loc, tree functionid)
3304 struct c_binding *b;
3308 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
3310 if (B_IN_SCOPE (b, external_scope))
3319 if (decl == error_mark_node)
3322 /* FIXME: Objective-C has weird not-really-builtin functions
3323 which are supposed to be visible automatically. They wind up
3324 in the external scope because they're pushed before the file
3325 scope gets created. Catch this here and rebind them into the
3327 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
3329 bind (functionid, decl, file_scope,
3330 /*invisible=*/false, /*nested=*/true,
3331 DECL_SOURCE_LOCATION (decl));
3336 tree newtype = default_function_type;
3338 TREE_TYPE (decl) = b->u.type;
3339 /* Implicit declaration of a function already declared
3340 (somehow) in a different scope, or as a built-in.
3341 If this is the first time this has happened, warn;
3342 then recycle the old declaration but with the new type. */
3343 if (!C_DECL_IMPLICIT (decl))
3345 implicit_decl_warning (loc, functionid, decl);
3346 C_DECL_IMPLICIT (decl) = 1;
3348 if (DECL_BUILT_IN (decl))
3350 newtype = build_type_attribute_variant (newtype,
3352 (TREE_TYPE (decl)));
3353 if (!comptypes (newtype, TREE_TYPE (decl)))
3355 bool warned = warning_at (loc, 0, "incompatible implicit "
3356 "declaration of built-in "
3357 "function %qD", decl);
3358 /* See if we can hint which header to include. */
3360 = header_for_builtin_fn (DECL_FUNCTION_CODE (decl));
3361 if (header != NULL && warned)
3362 inform (loc, "include %qs or provide a declaration of %qD",
3364 newtype = TREE_TYPE (decl);
3369 if (!comptypes (newtype, TREE_TYPE (decl)))
3371 error_at (loc, "incompatible implicit declaration of "
3372 "function %qD", decl);
3373 locate_old_decl (decl);
3376 b->u.type = TREE_TYPE (decl);
3377 TREE_TYPE (decl) = newtype;
3378 bind (functionid, decl, current_scope,
3379 /*invisible=*/false, /*nested=*/true,
3380 DECL_SOURCE_LOCATION (decl));
3385 /* Not seen before. */
3386 decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type);
3387 DECL_EXTERNAL (decl) = 1;
3388 TREE_PUBLIC (decl) = 1;
3389 C_DECL_IMPLICIT (decl) = 1;
3390 implicit_decl_warning (loc, functionid, 0);
3391 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
3393 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
3395 /* C89 says implicit declarations are in the innermost block.
3396 So we record the decl in the standard fashion. */
3397 decl = pushdecl (decl);
3399 /* No need to call objc_check_decl here - it's a function type. */
3400 rest_of_decl_compilation (decl, 0, 0);
3402 /* Write a record describing this implicit function declaration
3403 to the prototypes file (if requested). */
3404 gen_aux_info_record (decl, 0, 1, 0);
3406 /* Possibly apply some default attributes to this implicit declaration. */
3407 decl_attributes (&decl, NULL_TREE, 0);
3412 /* Issue an error message for a reference to an undeclared variable
3413 ID, including a reference to a builtin outside of function-call
3414 context. Establish a binding of the identifier to error_mark_node
3415 in an appropriate scope, which will suppress further errors for the
3416 same identifier. The error message should be given location LOC. */
3418 undeclared_variable (location_t loc, tree id)
3420 static bool already = false;
3421 struct c_scope *scope;
3423 if (current_function_decl == 0)
3425 error_at (loc, "%qE undeclared here (not in a function)", id);
3426 scope = current_scope;
3430 if (!objc_diagnose_private_ivar (id))
3431 error_at (loc, "%qE undeclared (first use in this function)", id);
3434 inform (loc, "each undeclared identifier is reported only"
3435 " once for each function it appears in");
3439 /* If we are parsing old-style parameter decls, current_function_decl
3440 will be nonnull but current_function_scope will be null. */
3441 scope = current_function_scope ? current_function_scope : current_scope;
3443 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
3447 /* Subroutine of lookup_label, declare_label, define_label: construct a
3448 LABEL_DECL with all the proper frills. Also create a struct
3449 c_label_vars initialized for the current scope. */
3452 make_label (location_t location, tree name, bool defining,
3453 struct c_label_vars **p_label_vars)
3455 tree label = build_decl (location, LABEL_DECL, name, void_type_node);
3456 DECL_CONTEXT (label) = current_function_decl;
3457 DECL_MODE (label) = VOIDmode;
3459 c_label_vars *label_vars = ggc_alloc<c_label_vars> ();
3460 label_vars->shadowed = NULL;
3461 set_spot_bindings (&label_vars->label_bindings, defining);
3462 label_vars->decls_in_scope = make_tree_vector ();
3463 label_vars->gotos = NULL;
3464 *p_label_vars = label_vars;
3469 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3470 Create one if none exists so far for the current function.
3471 This is called when a label is used in a goto expression or
3472 has its address taken. */
3475 lookup_label (tree name)
3478 struct c_label_vars *label_vars;
3480 if (current_function_scope == 0)
3482 error ("label %qE referenced outside of any function", name);
3486 /* Use a label already defined or ref'd with this name, but not if
3487 it is inherited from a containing function and wasn't declared
3489 label = I_LABEL_DECL (name);
3490 if (label && (DECL_CONTEXT (label) == current_function_decl
3491 || C_DECLARED_LABEL_FLAG (label)))
3493 /* If the label has only been declared, update its apparent
3494 location to point here, for better diagnostics if it
3495 turns out not to have been defined. */
3496 if (DECL_INITIAL (label) == NULL_TREE)
3497 DECL_SOURCE_LOCATION (label) = input_location;
3501 /* No label binding for that identifier; make one. */
3502 label = make_label (input_location, name, false, &label_vars);
3504 /* Ordinary labels go in the current function scope. */
3505 bind_label (name, label, current_function_scope, label_vars);
3510 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3514 warn_about_goto (location_t goto_loc, tree label, tree decl)
3516 if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3518 "jump into scope of identifier with variably modified type");
3520 warning_at (goto_loc, OPT_Wjump_misses_init,
3521 "jump skips variable initialization");
3522 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3523 inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl);
3526 /* Look up a label because of a goto statement. This is like
3527 lookup_label, but also issues any appropriate warnings. */
3530 lookup_label_for_goto (location_t loc, tree name)
3533 struct c_label_vars *label_vars;
3537 label = lookup_label (name);
3538 if (label == NULL_TREE)
3541 /* If we are jumping to a different function, we can't issue any
3543 if (DECL_CONTEXT (label) != current_function_decl)
3545 gcc_assert (C_DECLARED_LABEL_FLAG (label));
3549 label_vars = I_LABEL_BINDING (name)->u.label;
3551 /* If the label has not yet been defined, then push this goto on a
3552 list for possible later warnings. */
3553 if (label_vars->label_bindings.scope == NULL)
3555 c_goto_bindings *g = ggc_alloc<c_goto_bindings> ();
3558 set_spot_bindings (&g->goto_bindings, true);
3559 vec_safe_push (label_vars->gotos, g);
3563 /* If there are any decls in label_vars->decls_in_scope, then this
3564 goto has missed the declaration of the decl. This happens for a
3570 Issue a warning or error. */
3571 FOR_EACH_VEC_SAFE_ELT (label_vars->decls_in_scope, ix, decl)
3572 warn_about_goto (loc, label, decl);
3574 if (label_vars->label_bindings.left_stmt_expr)
3576 error_at (loc, "jump into statement expression");
3577 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3583 /* Make a label named NAME in the current function, shadowing silently
3584 any that may be inherited from containing functions or containing
3585 scopes. This is called for __label__ declarations. */
3588 declare_label (tree name)
3590 struct c_binding *b = I_LABEL_BINDING (name);
3592 struct c_label_vars *label_vars;
3594 /* Check to make sure that the label hasn't already been declared
3596 if (b && B_IN_CURRENT_SCOPE (b))
3598 error ("duplicate label declaration %qE", name);
3599 locate_old_decl (b->decl);
3601 /* Just use the previous declaration. */
3605 label = make_label (input_location, name, false, &label_vars);
3606 C_DECLARED_LABEL_FLAG (label) = 1;
3608 /* Declared labels go in the current scope. */
3609 bind_label (name, label, current_scope, label_vars);
3614 /* When we define a label, issue any appropriate warnings if there are
3615 any gotos earlier in the function which jump to this label. */
3618 check_earlier_gotos (tree label, struct c_label_vars* label_vars)
3621 struct c_goto_bindings *g;
3623 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
3625 struct c_binding *b;
3626 struct c_scope *scope;
3628 /* We have a goto to this label. The goto is going forward. In
3629 g->scope, the goto is going to skip any binding which was
3630 defined after g->bindings_in_scope. */
3631 if (g->goto_bindings.scope->has_jump_unsafe_decl)
3633 for (b = g->goto_bindings.scope->bindings;
3634 b != g->goto_bindings.bindings_in_scope;
3637 if (decl_jump_unsafe (b->decl))
3638 warn_about_goto (g->loc, label, b->decl);
3642 /* We also need to warn about decls defined in any scopes
3643 between the scope of the label and the scope of the goto. */
3644 for (scope = label_vars->label_bindings.scope;
3645 scope != g->goto_bindings.scope;
3646 scope = scope->outer)
3648 gcc_assert (scope != NULL);
3649 if (scope->has_jump_unsafe_decl)
3651 if (scope == label_vars->label_bindings.scope)
3652 b = label_vars->label_bindings.bindings_in_scope;
3654 b = scope->bindings;
3655 for (; b != NULL; b = b->prev)
3657 if (decl_jump_unsafe (b->decl))
3658 warn_about_goto (g->loc, label, b->decl);
3663 if (g->goto_bindings.stmt_exprs > 0)
3665 error_at (g->loc, "jump into statement expression");
3666 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here",
3671 /* Now that the label is defined, we will issue warnings about
3672 subsequent gotos to this label when we see them. */
3673 vec_safe_truncate (label_vars->gotos, 0);
3674 label_vars->gotos = NULL;
3677 /* Define a label, specifying the location in the source file.
3678 Return the LABEL_DECL node for the label, if the definition is valid.
3679 Otherwise return 0. */
3682 define_label (location_t location, tree name)
3684 /* Find any preexisting label with this name. It is an error
3685 if that label has already been defined in this function, or
3686 if there is a containing function with a declared label with
3688 tree label = I_LABEL_DECL (name);
3691 && ((DECL_CONTEXT (label) == current_function_decl
3692 && DECL_INITIAL (label) != 0)
3693 || (DECL_CONTEXT (label) != current_function_decl
3694 && C_DECLARED_LABEL_FLAG (label))))
3696 error_at (location, "duplicate label %qD", label);
3697 locate_old_decl (label);
3700 else if (label && DECL_CONTEXT (label) == current_function_decl)
3702 struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label;
3704 /* The label has been used or declared already in this function,
3705 but not defined. Update its location to point to this
3707 DECL_SOURCE_LOCATION (label) = location;
3708 set_spot_bindings (&label_vars->label_bindings, true);
3710 /* Issue warnings as required about any goto statements from
3711 earlier in the function. */
3712 check_earlier_gotos (label, label_vars);
3716 struct c_label_vars *label_vars;
3718 /* No label binding for that identifier; make one. */
3719 label = make_label (location, name, true, &label_vars);
3721 /* Ordinary labels go in the current function scope. */
3722 bind_label (name, label, current_function_scope, label_vars);
3725 if (!in_system_header_at (input_location) && lookup_name (name))
3726 warning_at (location, OPT_Wtraditional,
3727 "traditional C lacks a separate namespace "
3728 "for labels, identifier %qE conflicts", name);
3730 /* Mark label as having been defined. */
3731 DECL_INITIAL (label) = error_mark_node;
3735 /* Get the bindings for a new switch statement. This is used to issue
3736 warnings as appropriate for jumps from the switch to case or
3739 struct c_spot_bindings *
3740 c_get_switch_bindings (void)
3742 struct c_spot_bindings *switch_bindings;
3744 switch_bindings = XNEW (struct c_spot_bindings);
3745 set_spot_bindings (switch_bindings, true);
3746 return switch_bindings;
3750 c_release_switch_bindings (struct c_spot_bindings *bindings)
3752 gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr);
3756 /* This is called at the point of a case or default label to issue
3757 warnings about decls as needed. It returns true if it found an
3758 error, not just a warning. */
3761 c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings,
3762 location_t switch_loc, location_t case_loc)
3765 struct c_scope *scope;
3768 for (scope = current_scope;
3769 scope != switch_bindings->scope;
3770 scope = scope->outer)
3772 struct c_binding *b;
3774 gcc_assert (scope != NULL);
3776 if (!scope->has_jump_unsafe_decl)
3779 for (b = scope->bindings; b != NULL; b = b->prev)
3781 if (decl_jump_unsafe (b->decl))
3783 if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE))
3787 ("switch jumps into scope of identifier with "
3788 "variably modified type"));
3791 warning_at (case_loc, OPT_Wjump_misses_init,
3792 "switch jumps over variable initialization");
3793 inform (switch_loc, "switch starts here");
3794 inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here",
3800 if (switch_bindings->stmt_exprs > 0)
3803 error_at (case_loc, "switch jumps into statement expression");
3804 inform (switch_loc, "switch starts here");
3810 /* Given NAME, an IDENTIFIER_NODE,
3811 return the structure (or union or enum) definition for that name.
3812 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3813 CODE says which kind of type the caller wants;
3814 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3815 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3816 location where the tag was defined.
3817 If the wrong kind of type is found, an error is reported. */
3820 lookup_tag (enum tree_code code, tree name, bool thislevel_only,
3823 struct c_binding *b = I_TAG_BINDING (name);
3824 bool thislevel = false;
3829 /* We only care about whether it's in this level if
3830 thislevel_only was set or it might be a type clash. */
3831 if (thislevel_only || TREE_CODE (b->decl) != code)
3833 /* For our purposes, a tag in the external scope is the same as
3834 a tag in the file scope. (Primarily relevant to Objective-C
3835 and its builtin structure tags, which get pushed before the
3836 file scope is created.) */
3837 if (B_IN_CURRENT_SCOPE (b)
3838 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
3842 if (thislevel_only && !thislevel)
3845 if (TREE_CODE (b->decl) != code)
3847 /* Definition isn't the kind we were looking for. */
3848 pending_invalid_xref = name;
3849 pending_invalid_xref_location = input_location;
3851 /* If in the same binding level as a declaration as a tag
3852 of a different type, this must not be allowed to
3853 shadow that tag, so give the error immediately.
3854 (For example, "struct foo; union foo;" is invalid.) */
3856 pending_xref_error ();
3865 /* Return true if a definition exists for NAME with code CODE. */
3868 tag_exists_p (enum tree_code code, tree name)
3870 struct c_binding *b = I_TAG_BINDING (name);
3872 if (b == NULL || b->decl == NULL_TREE)
3874 return TREE_CODE (b->decl) == code;
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, true, 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 && ((VAR_P (*node) && is_global_var (*node))
4411 || TREE_CODE (*node) == FUNCTION_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 (VAR_P (*node)
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. */
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... */
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 && VAR_OR_FUNCTION_DECL_P (decl))
4621 objc_check_global_decl (decl);
4623 /* Add this decl to the current scope.
4624 TEM may equal DECL or it may be a previous decl of the same name. */
4625 tem = pushdecl (decl);
4627 if (initialized && DECL_EXTERNAL (tem))
4629 DECL_EXTERNAL (tem) = 0;
4630 TREE_STATIC (tem) = 1;
4636 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4637 DECL or the non-array element type if DECL is an uninitialized array.
4638 If that type has a const member, diagnose this. */
4641 diagnose_uninitialized_cst_member (tree decl, tree type)
4644 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
4647 if (TREE_CODE (field) != FIELD_DECL)
4649 field_type = strip_array_types (TREE_TYPE (field));
4651 if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST)
4653 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4654 "uninitialized const member in %qT is invalid in C++",
4655 strip_array_types (TREE_TYPE (decl)));
4656 inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field);
4659 if (TREE_CODE (field_type) == RECORD_TYPE
4660 || TREE_CODE (field_type) == UNION_TYPE)
4661 diagnose_uninitialized_cst_member (decl, field_type);
4665 /* Finish processing of a declaration;
4666 install its initial value.
4667 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4668 If the length of an array type is not known before,
4669 it must be determined now, from the initial value, or it is an error.
4671 INIT_LOC is the location of the initial value. */
4674 finish_decl (tree decl, location_t init_loc, tree init,
4675 tree origtype, tree asmspec_tree)
4678 bool was_incomplete = (DECL_SIZE (decl) == 0);
4679 const char *asmspec = 0;
4681 /* If a name was specified, get the string. */
4682 if (VAR_OR_FUNCTION_DECL_P (decl)
4683 && DECL_FILE_SCOPE_P (decl))
4684 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4686 asmspec = TREE_STRING_POINTER (asmspec_tree);
4689 && TREE_STATIC (decl)
4690 && global_bindings_p ())
4691 /* So decl is a global variable. Record the types it uses
4692 so that we can decide later to emit debug info for them. */
4693 record_types_used_by_current_var_decl (decl);
4695 /* If `start_decl' didn't like having an initialization, ignore it now. */
4696 if (init != 0 && DECL_INITIAL (decl) == 0)
4699 /* Don't crash if parm is initialized. */
4700 if (TREE_CODE (decl) == PARM_DECL)
4704 store_init_value (init_loc, decl, init, origtype);
4706 if (c_dialect_objc () && (VAR_OR_FUNCTION_DECL_P (decl)
4707 || TREE_CODE (decl) == FIELD_DECL))
4708 objc_check_decl (decl);
4710 type = TREE_TYPE (decl);
4712 /* Deduce size of array from initialization, if not already known. */
4713 if (TREE_CODE (type) == ARRAY_TYPE
4714 && TYPE_DOMAIN (type) == 0
4715 && TREE_CODE (decl) != TYPE_DECL)
4718 = (TREE_STATIC (decl)
4719 /* Even if pedantic, an external linkage array
4720 may have incomplete type at first. */
4721 ? pedantic && !TREE_PUBLIC (decl)
4722 : !DECL_EXTERNAL (decl));
4724 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
4727 /* Get the completed type made by complete_array_type. */
4728 type = TREE_TYPE (decl);
4733 error ("initializer fails to determine size of %q+D", decl);
4738 error ("array size missing in %q+D", decl);
4739 /* If a `static' var's size isn't known,
4740 make it extern as well as static, so it does not get
4742 If it is not `static', then do not mark extern;
4743 finish_incomplete_decl will give it a default size
4744 and it will get allocated. */
4745 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4746 DECL_EXTERNAL (decl) = 1;
4750 error ("zero or negative size array %q+D", decl);
4754 /* For global variables, update the copy of the type that
4755 exists in the binding. */
4756 if (TREE_PUBLIC (decl))
4758 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
4759 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
4760 b_ext = b_ext->shadowed;
4763 if (b_ext->u.type && comptypes (b_ext->u.type, type))
4764 b_ext->u.type = composite_type (b_ext->u.type, type);
4766 b_ext->u.type = type;
4775 if (DECL_INITIAL (decl))
4776 TREE_TYPE (DECL_INITIAL (decl)) = type;
4778 relayout_decl (decl);
4783 if (init && TREE_CODE (init) == CONSTRUCTOR)
4784 add_flexible_array_elts_to_size (decl, init);
4786 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
4787 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
4788 layout_decl (decl, 0);
4790 if (DECL_SIZE (decl) == 0
4791 /* Don't give an error if we already gave one earlier. */
4792 && TREE_TYPE (decl) != error_mark_node
4793 && (TREE_STATIC (decl)
4794 /* A static variable with an incomplete type
4795 is an error if it is initialized.
4796 Also if it is not file scope.
4797 Otherwise, let it through, but if it is not `extern'
4798 then it may cause an error message later. */
4799 ? (DECL_INITIAL (decl) != 0
4800 || !DECL_FILE_SCOPE_P (decl))
4801 /* An automatic variable with an incomplete type
4803 : !DECL_EXTERNAL (decl)))
4805 error ("storage size of %q+D isn%'t known", decl);
4806 TREE_TYPE (decl) = error_mark_node;
4809 if (is_global_var (decl) && DECL_SIZE (decl) != 0)
4811 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4812 constant_expression_warning (DECL_SIZE (decl));
4815 error ("storage size of %q+D isn%'t constant", decl);
4816 TREE_TYPE (decl) = error_mark_node;
4820 if (TREE_USED (type))
4822 TREE_USED (decl) = 1;
4823 DECL_READ_P (decl) = 1;
4827 /* If this is a function and an assembler name is specified, reset DECL_RTL
4828 so we can give it its new name. Also, update builtin_decl if it
4829 was a normal built-in. */
4830 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4832 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4833 set_builtin_user_assembler_name (decl, asmspec);
4834 set_user_assembler_name (decl, asmspec);
4837 /* If #pragma weak was used, mark the decl weak now. */
4838 maybe_apply_pragma_weak (decl);
4840 /* Output the assembler code and/or RTL code for variables and functions,
4841 unless the type is an undefined structure or union.
4842 If not, it will get done when the type is completed. */
4844 if (VAR_OR_FUNCTION_DECL_P (decl))
4846 /* Determine the ELF visibility. */
4847 if (TREE_PUBLIC (decl))
4848 c_determine_visibility (decl);
4850 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4851 if (c_dialect_objc ())
4852 objc_check_decl (decl);
4856 /* If this is not a static variable, issue a warning.
4857 It doesn't make any sense to give an ASMSPEC for an
4858 ordinary, non-register local variable. Historically,
4859 GCC has accepted -- but ignored -- the ASMSPEC in
4861 if (!DECL_FILE_SCOPE_P (decl)
4863 && !C_DECL_REGISTER (decl)
4864 && !TREE_STATIC (decl))
4865 warning (0, "ignoring asm-specifier for non-static local "
4866 "variable %q+D", decl);
4868 set_user_assembler_name (decl, asmspec);
4871 if (DECL_FILE_SCOPE_P (decl))
4873 if (DECL_INITIAL (decl) == NULL_TREE
4874 || DECL_INITIAL (decl) == error_mark_node)
4875 /* Don't output anything
4876 when a tentative file-scope definition is seen.
4877 But at end of compilation, do output code for them. */
4878 DECL_DEFER_OUTPUT (decl) = 1;
4879 if (asmspec && C_DECL_REGISTER (decl))
4880 DECL_HARD_REGISTER (decl) = 1;
4881 rest_of_decl_compilation (decl, true, 0);
4885 /* In conjunction with an ASMSPEC, the `register'
4886 keyword indicates that we should place the variable
4887 in a particular register. */
4888 if (asmspec && C_DECL_REGISTER (decl))
4890 DECL_HARD_REGISTER (decl) = 1;
4891 /* This cannot be done for a structure with volatile
4892 fields, on which DECL_REGISTER will have been
4894 if (!DECL_REGISTER (decl))
4895 error ("cannot put object with volatile field into register");
4898 if (TREE_CODE (decl) != FUNCTION_DECL)
4900 /* If we're building a variable sized type, and we might be
4901 reachable other than via the top of the current binding
4902 level, then create a new BIND_EXPR so that we deallocate
4903 the object at the right time. */
4904 /* Note that DECL_SIZE can be null due to errors. */
4905 if (DECL_SIZE (decl)
4906 && !TREE_CONSTANT (DECL_SIZE (decl))
4907 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
4910 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
4911 TREE_SIDE_EFFECTS (bind) = 1;
4913 BIND_EXPR_BODY (bind) = push_stmt_list ();
4915 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
4921 if (!DECL_FILE_SCOPE_P (decl))
4923 /* Recompute the RTL of a local array now
4924 if it used to be an incomplete type. */
4925 if (was_incomplete && !is_global_var (decl))
4927 /* If we used it already as memory, it must stay in memory. */
4928 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4929 /* If it's still incomplete now, no init will save it. */
4930 if (DECL_SIZE (decl) == 0)
4931 DECL_INITIAL (decl) = 0;
4936 if (TREE_CODE (decl) == TYPE_DECL)
4938 if (!DECL_FILE_SCOPE_P (decl)
4939 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
4940 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
4942 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
4945 /* Install a cleanup (aka destructor) if one was given. */
4946 if (VAR_P (decl) && !TREE_STATIC (decl))
4948 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
4951 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
4952 tree cleanup_decl = lookup_name (cleanup_id);
4954 vec<tree, va_gc> *v;
4956 /* Build "cleanup(&decl)" for the destructor. */
4957 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
4959 v->quick_push (cleanup);
4960 cleanup = c_build_function_call_vec (DECL_SOURCE_LOCATION (decl),
4961 vNULL, cleanup_decl, v, NULL);
4964 /* Don't warn about decl unused; the cleanup uses it. */
4965 TREE_USED (decl) = 1;
4966 TREE_USED (cleanup_decl) = 1;
4967 DECL_READ_P (decl) = 1;
4969 push_cleanup (decl, cleanup, false);
4975 && !DECL_EXTERNAL (decl)
4976 && DECL_INITIAL (decl) == NULL_TREE)
4978 type = strip_array_types (type);
4979 if (TREE_READONLY (decl))
4980 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4981 "uninitialized const %qD is invalid in C++", decl);
4982 else if ((TREE_CODE (type) == RECORD_TYPE
4983 || TREE_CODE (type) == UNION_TYPE)
4984 && C_TYPE_FIELDS_READONLY (type))
4985 diagnose_uninitialized_cst_member (decl, type);
4988 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
4991 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4992 EXPR is NULL or a pointer to an expression that needs to be
4993 evaluated for the side effects of array size expressions in the
4997 grokparm (const struct c_parm *parm, tree *expr)
4999 tree attrs = parm->attrs;
5000 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
5001 NULL, &attrs, expr, NULL, DEPRECATED_NORMAL);
5003 decl_attributes (&decl, attrs, 0);
5008 /* Given a parsed parameter declaration, decode it into a PARM_DECL
5009 and push that on the current scope. EXPR is a pointer to an
5010 expression that needs to be evaluated for the side effects of array
5011 size expressions in the parameters. */
5014 push_parm_decl (const struct c_parm *parm, tree *expr)
5016 tree attrs = parm->attrs;
5019 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
5020 &attrs, expr, NULL, DEPRECATED_NORMAL);
5021 decl_attributes (&decl, attrs, 0);
5023 decl = pushdecl (decl);
5025 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
5028 /* Mark all the parameter declarations to date as forward decls.
5029 Also diagnose use of this extension. */
5032 mark_forward_parm_decls (void)
5034 struct c_binding *b;
5036 if (pedantic && !current_scope->warned_forward_parm_decls)
5038 pedwarn (input_location, OPT_Wpedantic,
5039 "ISO C forbids forward parameter declarations");
5040 current_scope->warned_forward_parm_decls = true;
5043 for (b = current_scope->bindings; b; b = b->prev)
5044 if (TREE_CODE (b->decl) == PARM_DECL)
5045 TREE_ASM_WRITTEN (b->decl) = 1;
5048 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5049 literal, which may be an incomplete array type completed by the
5050 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5051 literal. NON_CONST is true if the initializers contain something
5052 that cannot occur in a constant expression. */
5055 build_compound_literal (location_t loc, tree type, tree init, bool non_const)
5057 /* We do not use start_decl here because we have a type, not a declarator;
5058 and do not use finish_decl because the decl should be stored inside
5059 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5064 if (type == error_mark_node
5065 || init == error_mark_node)
5066 return error_mark_node;
5068 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
5069 DECL_EXTERNAL (decl) = 0;
5070 TREE_PUBLIC (decl) = 0;
5071 TREE_STATIC (decl) = (current_scope == file_scope);
5072 DECL_CONTEXT (decl) = current_function_decl;
5073 TREE_USED (decl) = 1;
5074 DECL_READ_P (decl) = 1;
5075 TREE_TYPE (decl) = type;
5076 TREE_READONLY (decl) = (TYPE_READONLY (type)
5077 || (TREE_CODE (type) == ARRAY_TYPE
5078 && TYPE_READONLY (TREE_TYPE (type))));
5079 store_init_value (loc, decl, init, NULL_TREE);
5081 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
5083 int failure = complete_array_type (&TREE_TYPE (decl),
5084 DECL_INITIAL (decl), true);
5085 /* If complete_array_type returns 3, it means that the
5086 initial value of the compound literal is empty. Allow it. */
5087 gcc_assert (failure == 0 || failure == 3);
5089 type = TREE_TYPE (decl);
5090 TREE_TYPE (DECL_INITIAL (decl)) = type;
5093 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
5095 c_incomplete_type_error (NULL_TREE, type);
5096 return error_mark_node;
5099 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
5100 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
5101 TREE_SIDE_EFFECTS (complit) = 1;
5103 layout_decl (decl, 0);
5105 if (TREE_STATIC (decl))
5107 /* This decl needs a name for the assembler output. */
5108 set_compound_literal_name (decl);
5109 DECL_DEFER_OUTPUT (decl) = 1;
5110 DECL_COMDAT (decl) = 1;
5111 DECL_ARTIFICIAL (decl) = 1;
5112 DECL_IGNORED_P (decl) = 1;
5114 rest_of_decl_compilation (decl, 1, 0);
5119 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
5120 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
5126 /* Check the type of a compound literal. Here we just check that it
5127 is valid for C++. */
5130 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
5133 && (type_name->specs->typespec_kind == ctsk_tagdef
5134 || type_name->specs->typespec_kind == ctsk_tagfirstref))
5135 warning_at (loc, OPT_Wc___compat,
5136 "defining a type in a compound literal is invalid in C++");
5139 /* Determine whether TYPE is a structure with a flexible array member,
5140 or a union containing such a structure (possibly recursively). */
5143 flexible_array_type_p (tree type)
5146 switch (TREE_CODE (type))
5149 x = TYPE_FIELDS (type);
5152 while (DECL_CHAIN (x) != NULL_TREE)
5154 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5155 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5156 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5157 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5161 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x))
5163 if (flexible_array_type_p (TREE_TYPE (x)))
5172 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
5173 replacing with appropriate values if they are invalid. */
5176 check_bitfield_type_and_width (location_t loc, tree *type, tree *width,
5180 unsigned int max_width;
5181 unsigned HOST_WIDE_INT w;
5182 const char *name = (orig_name
5183 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
5184 : _("<anonymous>"));
5186 /* Detect and ignore out of range field width and process valid
5188 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)))
5190 error_at (loc, "bit-field %qs width not an integer constant", name);
5191 *width = integer_one_node;
5195 if (TREE_CODE (*width) != INTEGER_CST)
5197 *width = c_fully_fold (*width, false, NULL);
5198 if (TREE_CODE (*width) == INTEGER_CST)
5199 pedwarn (loc, OPT_Wpedantic,
5200 "bit-field %qs width not an integer constant expression",
5203 if (TREE_CODE (*width) != INTEGER_CST)
5205 error_at (loc, "bit-field %qs width not an integer constant", name);
5206 *width = integer_one_node;
5208 constant_expression_warning (*width);
5209 if (tree_int_cst_sgn (*width) < 0)
5211 error_at (loc, "negative width in bit-field %qs", name);
5212 *width = integer_one_node;
5214 else if (integer_zerop (*width) && orig_name)
5216 error_at (loc, "zero width for bit-field %qs", name);
5217 *width = integer_one_node;
5221 /* Detect invalid bit-field type. */
5222 if (TREE_CODE (*type) != INTEGER_TYPE
5223 && TREE_CODE (*type) != BOOLEAN_TYPE
5224 && TREE_CODE (*type) != ENUMERAL_TYPE)
5226 error_at (loc, "bit-field %qs has invalid type", name);
5227 *type = unsigned_type_node;
5230 type_mv = TYPE_MAIN_VARIANT (*type);
5231 if (!in_system_header_at (input_location)
5232 && type_mv != integer_type_node
5233 && type_mv != unsigned_type_node
5234 && type_mv != boolean_type_node)
5235 pedwarn_c90 (loc, OPT_Wpedantic,
5236 "type of bit-field %qs is a GCC extension", name);
5238 max_width = TYPE_PRECISION (*type);
5240 if (0 < compare_tree_int (*width, max_width))
5242 error_at (loc, "width of %qs exceeds its type", name);
5244 *width = build_int_cst (integer_type_node, w);
5247 w = tree_to_uhwi (*width);
5249 if (TREE_CODE (*type) == ENUMERAL_TYPE)
5251 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
5253 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_SIGN (*type))
5254 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_SIGN (*type)))
5255 warning_at (loc, 0, "%qs is narrower than values of its type", name);
5261 /* Print warning about variable length array if necessary. */
5264 warn_variable_length_array (tree name, tree size)
5266 if (TREE_CONSTANT (size))
5269 pedwarn_c90 (input_location, OPT_Wvla,
5270 "ISO C90 forbids array %qE whose size "
5271 "can%'t be evaluated", name);
5273 pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids array "
5274 "whose size can%'t be evaluated");
5279 pedwarn_c90 (input_location, OPT_Wvla,
5280 "ISO C90 forbids variable length array %qE", name);
5282 pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids variable "
5287 /* Print warning about defaulting to int if necessary. */
5290 warn_defaults_to (location_t location, int opt, const char *gmsgid, ...)
5292 diagnostic_info diagnostic;
5295 va_start (ap, gmsgid);
5296 diagnostic_set_info (&diagnostic, gmsgid, &ap, location,
5297 flag_isoc99 ? DK_PEDWARN : DK_WARNING);
5298 diagnostic.option_index = opt;
5299 report_diagnostic (&diagnostic);
5303 /* Given declspecs and a declarator,
5304 determine the name and type of the object declared
5305 and construct a ..._DECL node for it.
5306 (In one case we can return a ..._TYPE node instead.
5307 For invalid input we sometimes return 0.)
5309 DECLSPECS is a c_declspecs structure for the declaration specifiers.
5311 DECL_CONTEXT says which syntactic context this declaration is in:
5312 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
5313 FUNCDEF for a function definition. Like NORMAL but a few different
5314 error messages in each case. Return value may be zero meaning
5315 this definition is too screwy to try to parse.
5316 PARM for a parameter declaration (either within a function prototype
5317 or before a function body). Make a PARM_DECL, or return void_type_node.
5318 TYPENAME if for a typename (in a cast or sizeof).
5319 Don't make a DECL node; just return the ..._TYPE node.
5320 FIELD for a struct or union field; make a FIELD_DECL.
5321 INITIALIZED is true if the decl has an initializer.
5322 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
5323 representing the width of the bit-field.
5324 DECL_ATTRS points to the list of attributes that should be added to this
5325 decl. Any nested attributes that belong on the decl itself will be
5327 If EXPR is not NULL, any expressions that need to be evaluated as
5328 part of evaluating variably modified types will be stored in *EXPR.
5329 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
5330 set to indicate whether operands in *EXPR can be used in constant
5332 DEPRECATED_STATE is a deprecated_states value indicating whether
5333 deprecation warnings should be suppressed.
5335 In the TYPENAME case, DECLARATOR is really an absolute declarator.
5336 It may also be so in the PARM case, for a prototype where the
5337 argument type is specified but not the name.
5339 This function is where the complicated C meanings of `static'
5340 and `extern' are interpreted. */
5343 grokdeclarator (const struct c_declarator *declarator,
5344 struct c_declspecs *declspecs,
5345 enum decl_context decl_context, bool initialized, tree *width,
5346 tree *decl_attrs, tree *expr, bool *expr_const_operands,
5347 enum deprecated_states deprecated_state)
5349 tree type = declspecs->type;
5350 bool threadp = declspecs->thread_p;
5351 enum c_storage_class storage_class = declspecs->storage_class;
5356 int type_quals = TYPE_UNQUALIFIED;
5357 tree name = NULL_TREE;
5358 bool funcdef_flag = false;
5359 bool funcdef_syntax = false;
5360 bool size_varies = false;
5361 tree decl_attr = declspecs->decl_attr;
5362 int array_ptr_quals = TYPE_UNQUALIFIED;
5363 tree array_ptr_attrs = NULL_TREE;
5364 int array_parm_static = 0;
5365 bool array_parm_vla_unspec_p = false;
5366 tree returned_attrs = NULL_TREE;
5367 bool bitfield = width != NULL;
5369 struct c_arg_info *arg_info = 0;
5370 addr_space_t as1, as2, address_space;
5371 location_t loc = UNKNOWN_LOCATION;
5374 bool expr_const_operands_dummy;
5375 enum c_declarator_kind first_non_attr_kind;
5376 unsigned int alignas_align = 0;
5378 if (TREE_CODE (type) == ERROR_MARK)
5379 return error_mark_node;
5382 if (expr_const_operands == NULL)
5383 expr_const_operands = &expr_const_operands_dummy;
5385 *expr = declspecs->expr;
5386 *expr_const_operands = declspecs->expr_const_operands;
5388 if (decl_context == FUNCDEF)
5389 funcdef_flag = true, decl_context = NORMAL;
5391 /* Look inside a declarator for the name being declared
5392 and get it as an IDENTIFIER_NODE, for an error message. */
5394 const struct c_declarator *decl = declarator;
5396 first_non_attr_kind = cdk_attrs;
5406 funcdef_syntax = (decl->kind == cdk_function);
5407 decl = decl->declarator;
5408 if (first_non_attr_kind == cdk_attrs)
5409 first_non_attr_kind = decl->kind;
5413 decl = decl->declarator;
5420 if (first_non_attr_kind == cdk_attrs)
5421 first_non_attr_kind = decl->kind;
5430 gcc_assert (decl_context == PARM
5431 || decl_context == TYPENAME
5432 || (decl_context == FIELD
5433 && declarator->kind == cdk_id));
5434 gcc_assert (!initialized);
5438 /* A function definition's declarator must have the form of
5439 a function declarator. */
5441 if (funcdef_flag && !funcdef_syntax)
5444 /* If this looks like a function definition, make it one,
5445 even if it occurs where parms are expected.
5446 Then store_parm_decls will reject it and not use it as a parm. */
5447 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
5448 decl_context = PARM;
5450 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
5451 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
5453 if ((decl_context == NORMAL || decl_context == FIELD)
5454 && current_scope == file_scope
5455 && variably_modified_type_p (type, NULL_TREE))
5458 error_at (loc, "variably modified %qE at file scope", name);
5460 error_at (loc, "variably modified field at file scope");
5461 type = integer_type_node;
5464 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
5466 /* Diagnose defaulting to "int". */
5468 if (declspecs->default_int_p && !in_system_header_at (input_location))
5470 /* Issue a warning if this is an ISO C 99 program or if
5471 -Wreturn-type and this is a function, or if -Wimplicit;
5472 prefer the former warning since it is more explicit. */
5473 if ((warn_implicit_int || warn_return_type || flag_isoc99)
5475 warn_about_return_type = 1;
5479 warn_defaults_to (loc, OPT_Wimplicit_int,
5480 "type defaults to %<int%> in declaration "
5483 warn_defaults_to (loc, OPT_Wimplicit_int,
5484 "type defaults to %<int%> in type name");
5488 /* Adjust the type if a bit-field is being declared,
5489 -funsigned-bitfields applied and the type is not explicitly
5491 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
5492 && TREE_CODE (type) == INTEGER_TYPE)
5493 type = unsigned_type_for (type);
5495 /* Figure out the type qualifiers for the declaration. There are
5496 two ways a declaration can become qualified. One is something
5497 like `const int i' where the `const' is explicit. Another is
5498 something like `typedef const int CI; CI i' where the type of the
5499 declaration contains the `const'. A third possibility is that
5500 there is a type qualifier on the element type of a typedefed
5501 array type, in which case we should extract that qualifier so
5502 that c_apply_type_quals_to_decl receives the full list of
5503 qualifiers to work with (C90 is not entirely clear about whether
5504 duplicate qualifiers should be diagnosed in this case, but it
5505 seems most appropriate to do so). */
5506 element_type = strip_array_types (type);
5507 constp = declspecs->const_p + TYPE_READONLY (element_type);
5508 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
5509 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
5510 atomicp = declspecs->atomic_p + TYPE_ATOMIC (element_type);
5511 as1 = declspecs->address_space;
5512 as2 = TYPE_ADDR_SPACE (element_type);
5513 address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1;
5516 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<const%>");
5518 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<restrict%>");
5520 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<volatile%>");
5522 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<_Atomic%>");
5524 if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2)
5525 error_at (loc, "conflicting named address spaces (%s vs %s)",
5526 c_addr_space_name (as1), c_addr_space_name (as2));
5528 if ((TREE_CODE (type) == ARRAY_TYPE
5529 || first_non_attr_kind == cdk_array)
5530 && TYPE_QUALS (element_type))
5531 type = TYPE_MAIN_VARIANT (type);
5532 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
5533 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
5534 | (volatilep ? TYPE_QUAL_VOLATILE : 0)
5535 | (atomicp ? TYPE_QUAL_ATOMIC : 0)
5536 | ENCODE_QUAL_ADDR_SPACE (address_space));
5538 /* Applying the _Atomic qualifier to an array type (through the use
5539 of typedefs or typeof) must be detected here. If the qualifier
5540 is introduced later, any appearance of applying it to an array is
5541 actually applying it to an element of that array. */
5542 if (atomicp && TREE_CODE (type) == ARRAY_TYPE)
5543 error_at (loc, "%<_Atomic%>-qualified array type");
5545 /* Warn about storage classes that are invalid for certain
5546 kinds of declarations (parameters, typenames, etc.). */
5550 || storage_class == csc_auto
5551 || storage_class == csc_register
5552 || storage_class == csc_typedef))
5554 if (storage_class == csc_auto)
5556 (current_scope == file_scope) ? 0 : OPT_Wpedantic,
5557 "function definition declared %<auto%>");
5558 if (storage_class == csc_register)
5559 error_at (loc, "function definition declared %<register%>");
5560 if (storage_class == csc_typedef)
5561 error_at (loc, "function definition declared %<typedef%>");
5563 error_at (loc, "function definition declared %qs",
5564 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
5566 if (storage_class == csc_auto
5567 || storage_class == csc_register
5568 || storage_class == csc_typedef)
5569 storage_class = csc_none;
5571 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
5573 if (decl_context == PARM && storage_class == csc_register)
5577 switch (decl_context)
5581 error_at (loc, "storage class specified for structure "
5584 error_at (loc, "storage class specified for structure field");
5588 error_at (loc, "storage class specified for parameter %qE",
5591 error_at (loc, "storage class specified for unnamed parameter");
5594 error_at (loc, "storage class specified for typename");
5597 storage_class = csc_none;
5601 else if (storage_class == csc_extern
5605 /* 'extern' with initialization is invalid if not at file scope. */
5606 if (current_scope == file_scope)
5608 /* It is fine to have 'extern const' when compiling at C
5609 and C++ intersection. */
5610 if (!(warn_cxx_compat && constp))
5611 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
5615 error_at (loc, "%qE has both %<extern%> and initializer", name);
5617 else if (current_scope == file_scope)
5619 if (storage_class == csc_auto)
5620 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
5622 if (pedantic && storage_class == csc_register)
5623 pedwarn (input_location, OPT_Wpedantic,
5624 "file-scope declaration of %qE specifies %<register%>", name);
5628 if (storage_class == csc_extern && funcdef_flag)
5629 error_at (loc, "nested function %qE declared %<extern%>", name);
5630 else if (threadp && storage_class == csc_none)
5632 error_at (loc, "function-scope %qE implicitly auto and declared "
5634 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
5639 /* Now figure out the structure of the declarator proper.
5640 Descend through it, creating more complex types, until we reach
5641 the declared identifier (or NULL_TREE, in an absolute declarator).
5642 At each stage we maintain an unqualified version of the type
5643 together with any qualifiers that should be applied to it with
5644 c_build_qualified_type; this way, array types including
5645 multidimensional array types are first built up in unqualified
5646 form and then the qualified form is created with
5647 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5649 while (declarator && declarator->kind != cdk_id)
5651 if (type == error_mark_node)
5653 declarator = declarator->declarator;
5657 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5658 a cdk_pointer (for *...),
5659 a cdk_function (for ...(...)),
5660 a cdk_attrs (for nested attributes),
5661 or a cdk_id (for the name being declared
5662 or the place in an absolute declarator
5663 where the name was omitted).
5664 For the last case, we have just exited the loop.
5666 At this point, TYPE is the type of elements of an array,
5667 or for a function to return, or for a pointer to point to.
5668 After this sequence of ifs, TYPE is the type of the
5669 array or function or pointer, and DECLARATOR has had its
5670 outermost layer removed. */
5672 if (array_ptr_quals != TYPE_UNQUALIFIED
5673 || array_ptr_attrs != NULL_TREE
5674 || array_parm_static)
5676 /* Only the innermost declarator (making a parameter be of
5677 array type which is converted to pointer type)
5678 may have static or type qualifiers. */
5679 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5680 array_ptr_quals = TYPE_UNQUALIFIED;
5681 array_ptr_attrs = NULL_TREE;
5682 array_parm_static = 0;
5685 switch (declarator->kind)
5689 /* A declarator with embedded attributes. */
5690 tree attrs = declarator->u.attrs;
5691 const struct c_declarator *inner_decl;
5693 declarator = declarator->declarator;
5694 inner_decl = declarator;
5695 while (inner_decl->kind == cdk_attrs)
5696 inner_decl = inner_decl->declarator;
5697 if (inner_decl->kind == cdk_id)
5698 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
5699 else if (inner_decl->kind == cdk_function)
5700 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
5701 else if (inner_decl->kind == cdk_array)
5702 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
5703 returned_attrs = decl_attributes (&type,
5704 chainon (returned_attrs, attrs),
5710 tree itype = NULL_TREE;
5711 tree size = declarator->u.array.dimen;
5712 /* The index is a signed object `sizetype' bits wide. */
5713 tree index_type = c_common_signed_type (sizetype);
5715 array_ptr_quals = declarator->u.array.quals;
5716 array_ptr_attrs = declarator->u.array.attrs;
5717 array_parm_static = declarator->u.array.static_p;
5718 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
5720 declarator = declarator->declarator;
5722 /* Check for some types that there cannot be arrays of. */
5724 if (VOID_TYPE_P (type))
5727 error_at (loc, "declaration of %qE as array of voids", name);
5729 error_at (loc, "declaration of type name as array of voids");
5730 type = error_mark_node;
5733 if (TREE_CODE (type) == FUNCTION_TYPE)
5736 error_at (loc, "declaration of %qE as array of functions",
5739 error_at (loc, "declaration of type name as array of "
5741 type = error_mark_node;
5744 if (pedantic && !in_system_header_at (input_location)
5745 && flexible_array_type_p (type))
5746 pedwarn (loc, OPT_Wpedantic,
5747 "invalid use of structure with flexible array member");
5749 if (size == error_mark_node)
5750 type = error_mark_node;
5752 if (type == error_mark_node)
5755 /* If size was specified, set ITYPE to a range-type for
5756 that size. Otherwise, ITYPE remains null. finish_decl
5757 may figure it out from an initial value. */
5761 bool size_maybe_const = true;
5762 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
5763 && !TREE_OVERFLOW (size));
5764 bool this_size_varies = false;
5766 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5768 STRIP_TYPE_NOPS (size);
5770 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
5773 error_at (loc, "size of array %qE has non-integer type",
5777 "size of unnamed array has non-integer type");
5778 size = integer_one_node;
5781 size = c_fully_fold (size, false, &size_maybe_const);
5783 if (pedantic && size_maybe_const && integer_zerop (size))
5786 pedwarn (loc, OPT_Wpedantic,
5787 "ISO C forbids zero-size array %qE", name);
5789 pedwarn (loc, OPT_Wpedantic,
5790 "ISO C forbids zero-size array");
5793 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
5795 constant_expression_warning (size);
5796 if (tree_int_cst_sgn (size) < 0)
5799 error_at (loc, "size of array %qE is negative", name);
5801 error_at (loc, "size of unnamed array is negative");
5802 size = integer_one_node;
5804 /* Handle a size folded to an integer constant but
5805 not an integer constant expression. */
5806 if (!size_int_const)
5808 /* If this is a file scope declaration of an
5809 ordinary identifier, this is invalid code;
5810 diagnosing it here and not subsequently
5811 treating the type as variable-length avoids
5812 more confusing diagnostics later. */
5813 if ((decl_context == NORMAL || decl_context == FIELD)
5814 && current_scope == file_scope)
5815 pedwarn (input_location, 0,
5816 "variably modified %qE at file scope",
5819 this_size_varies = size_varies = true;
5820 warn_variable_length_array (name, size);
5823 else if ((decl_context == NORMAL || decl_context == FIELD)
5824 && current_scope == file_scope)
5826 error_at (loc, "variably modified %qE at file scope", name);
5827 size = integer_one_node;
5831 /* Make sure the array size remains visibly
5832 nonconstant even if it is (eg) a const variable
5833 with known value. */
5834 this_size_varies = size_varies = true;
5835 warn_variable_length_array (name, size);
5836 if (flag_sanitize & SANITIZE_VLA
5837 && decl_context == NORMAL
5838 && do_ubsan_in_current_function ())
5840 /* Evaluate the array size only once. */
5841 size = c_save_expr (size);
5842 size = c_fully_fold (size, false, NULL);
5843 size = fold_build2 (COMPOUND_EXPR, TREE_TYPE (size),
5844 ubsan_instrument_vla (loc, size),
5849 if (integer_zerop (size) && !this_size_varies)
5851 /* A zero-length array cannot be represented with
5852 an unsigned index type, which is what we'll
5853 get with build_index_type. Create an
5854 open-ended range instead. */
5855 itype = build_range_type (sizetype, size, NULL_TREE);
5859 /* Arrange for the SAVE_EXPR on the inside of the
5860 MINUS_EXPR, which allows the -1 to get folded
5861 with the +1 that happens when building TYPE_SIZE. */
5863 size = save_expr (size);
5864 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
5865 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5866 integer_zero_node, size);
5868 /* Compute the maximum valid index, that is, size
5869 - 1. Do the calculation in index_type, so that
5870 if it is a variable the computations will be
5871 done in the proper mode. */
5872 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
5873 convert (index_type, size),
5874 convert (index_type,
5877 /* The above overflows when size does not fit
5879 ??? While a size of INT_MAX+1 technically shouldn't
5880 cause an overflow (because we subtract 1), handling
5881 this case seems like an unnecessary complication. */
5882 if (TREE_CODE (size) == INTEGER_CST
5883 && !int_fits_type_p (size, index_type))
5886 error_at (loc, "size of array %qE is too large",
5889 error_at (loc, "size of unnamed array is too large");
5890 type = error_mark_node;
5894 itype = build_index_type (itype);
5896 if (this_size_varies)
5899 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5903 *expr_const_operands &= size_maybe_const;
5906 else if (decl_context == FIELD)
5908 bool flexible_array_member = false;
5909 if (array_parm_vla_unspec_p)
5910 /* Field names can in fact have function prototype
5911 scope so [*] is disallowed here through making
5912 the field variably modified, not through being
5913 something other than a declaration with function
5918 const struct c_declarator *t = declarator;
5919 while (t->kind == cdk_attrs)
5921 flexible_array_member = (t->kind == cdk_id);
5923 if (flexible_array_member
5924 && !in_system_header_at (input_location))
5925 pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not "
5926 "support flexible array members");
5928 /* ISO C99 Flexible array members are effectively
5929 identical to GCC's zero-length array extension. */
5930 if (flexible_array_member || array_parm_vla_unspec_p)
5931 itype = build_range_type (sizetype, size_zero_node,
5934 else if (decl_context == PARM)
5936 if (array_parm_vla_unspec_p)
5938 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
5942 else if (decl_context == TYPENAME)
5944 if (array_parm_vla_unspec_p)
5947 warning (0, "%<[*]%> not in a declaration");
5948 /* We use this to avoid messing up with incomplete
5949 array types of the same type, that would
5950 otherwise be modified below. */
5951 itype = build_range_type (sizetype, size_zero_node,
5957 /* Complain about arrays of incomplete types. */
5958 if (!COMPLETE_TYPE_P (type))
5960 error_at (loc, "array type has incomplete element type %qT",
5962 type = error_mark_node;
5965 /* When itype is NULL, a shared incomplete array type is
5966 returned for all array of a given type. Elsewhere we
5967 make sure we don't complete that type before copying
5968 it, but here we want to make sure we don't ever
5969 modify the shared type, so we gcc_assert (itype)
5972 addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals);
5973 if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type))
5974 type = build_qualified_type (type,
5975 ENCODE_QUAL_ADDR_SPACE (as));
5977 type = build_array_type (type, itype);
5980 if (type != error_mark_node)
5984 /* It is ok to modify type here even if itype is
5985 NULL: if size_varies, we're in a
5986 multi-dimensional array and the inner type has
5987 variable size, so the enclosing shared array type
5989 if (size && TREE_CODE (size) == INTEGER_CST)
5991 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5992 C_TYPE_VARIABLE_SIZE (type) = 1;
5995 /* The GCC extension for zero-length arrays differs from
5996 ISO flexible array members in that sizeof yields
5998 if (size && integer_zerop (size))
6001 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
6002 TYPE_SIZE (type) = bitsize_zero_node;
6003 TYPE_SIZE_UNIT (type) = size_zero_node;
6004 SET_TYPE_STRUCTURAL_EQUALITY (type);
6006 if (array_parm_vla_unspec_p)
6009 /* The type is complete. C99 6.7.5.2p4 */
6010 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
6011 TYPE_SIZE (type) = bitsize_zero_node;
6012 TYPE_SIZE_UNIT (type) = size_zero_node;
6013 SET_TYPE_STRUCTURAL_EQUALITY (type);
6017 if (decl_context != PARM
6018 && (array_ptr_quals != TYPE_UNQUALIFIED
6019 || array_ptr_attrs != NULL_TREE
6020 || array_parm_static))
6022 error_at (loc, "static or type qualifiers in non-parameter array declarator");
6023 array_ptr_quals = TYPE_UNQUALIFIED;
6024 array_ptr_attrs = NULL_TREE;
6025 array_parm_static = 0;
6031 /* Say it's a definition only for the declarator closest
6032 to the identifier, apart possibly from some
6034 bool really_funcdef = false;
6038 const struct c_declarator *t = declarator->declarator;
6039 while (t->kind == cdk_attrs)
6041 really_funcdef = (t->kind == cdk_id);
6044 /* Declaring a function type. Make sure we have a valid
6045 type for the function to return. */
6046 if (type == error_mark_node)
6049 size_varies = false;
6051 /* Warn about some types functions can't return. */
6052 if (TREE_CODE (type) == FUNCTION_TYPE)
6055 error_at (loc, "%qE declared as function returning a "
6058 error_at (loc, "type name declared as function "
6059 "returning a function");
6060 type = integer_type_node;
6062 if (TREE_CODE (type) == ARRAY_TYPE)
6065 error_at (loc, "%qE declared as function returning an array",
6068 error_at (loc, "type name declared as function returning "
6070 type = integer_type_node;
6072 errmsg = targetm.invalid_return_type (type);
6076 type = integer_type_node;
6079 /* Construct the function type and go to the next
6080 inner layer of declarator. */
6081 arg_info = declarator->u.arg_info;
6082 arg_types = grokparms (arg_info, really_funcdef);
6084 /* Type qualifiers before the return type of the function
6085 qualify the return type, not the function type. */
6088 /* Type qualifiers on a function return type are
6089 normally permitted by the standard but have no
6090 effect, so give a warning at -Wreturn-type.
6091 Qualifiers on a void return type are banned on
6092 function definitions in ISO C; GCC used to used
6093 them for noreturn functions. */
6094 if (VOID_TYPE_P (type) && really_funcdef)
6096 "function definition has qualified void return type");
6098 warning_at (loc, OPT_Wignored_qualifiers,
6099 "type qualifiers ignored on function return type");
6101 type = c_build_qualified_type (type, type_quals);
6103 type_quals = TYPE_UNQUALIFIED;
6105 type = build_function_type (type, arg_types);
6106 declarator = declarator->declarator;
6108 /* Set the TYPE_CONTEXTs for each tagged type which is local to
6109 the formal parameter list of this FUNCTION_TYPE to point to
6110 the FUNCTION_TYPE node itself. */
6115 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
6116 TYPE_CONTEXT (tag->type) = type;
6122 /* Merge any constancy or volatility into the target type
6124 if ((type_quals & TYPE_QUAL_ATOMIC)
6125 && TREE_CODE (type) == FUNCTION_TYPE)
6128 "%<_Atomic%>-qualified function type");
6129 type_quals &= ~TYPE_QUAL_ATOMIC;
6131 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
6133 pedwarn (loc, OPT_Wpedantic,
6134 "ISO C forbids qualified function types");
6136 type = c_build_qualified_type (type, type_quals);
6137 size_varies = false;
6139 /* When the pointed-to type involves components of variable size,
6140 care must be taken to ensure that the size evaluation code is
6141 emitted early enough to dominate all the possible later uses
6142 and late enough for the variables on which it depends to have
6145 This is expected to happen automatically when the pointed-to
6146 type has a name/declaration of it's own, but special attention
6147 is required if the type is anonymous.
6149 We handle the NORMAL and FIELD contexts here by attaching an
6150 artificial TYPE_DECL to such pointed-to type. This forces the
6151 sizes evaluation at a safe point and ensures it is not deferred
6152 until e.g. within a deeper conditional context.
6154 We expect nothing to be needed here for PARM or TYPENAME.
6155 Pushing a TYPE_DECL at this point for TYPENAME would actually
6156 be incorrect, as we might be in the middle of an expression
6157 with side effects on the pointed-to type size "arguments" prior
6158 to the pointer declaration point and the fake TYPE_DECL in the
6159 enclosing context would force the size evaluation prior to the
6162 if (!TYPE_NAME (type)
6163 && (decl_context == NORMAL || decl_context == FIELD)
6164 && variably_modified_type_p (type, NULL_TREE))
6166 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
6167 DECL_ARTIFICIAL (decl) = 1;
6169 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
6170 TYPE_NAME (type) = decl;
6173 type = c_build_pointer_type (type);
6175 /* Process type qualifiers (such as const or volatile)
6176 that were given inside the `*'. */
6177 type_quals = declarator->u.pointer_quals;
6179 declarator = declarator->declarator;
6186 *decl_attrs = chainon (returned_attrs, *decl_attrs);
6188 /* Now TYPE has the actual type, apart from any qualifiers in
6191 /* Warn about address space used for things other than static memory or
6193 address_space = DECODE_QUAL_ADDR_SPACE (type_quals);
6194 if (!ADDR_SPACE_GENERIC_P (address_space))
6196 if (decl_context == NORMAL)
6198 switch (storage_class)
6201 error ("%qs combined with %<auto%> qualifier for %qE",
6202 c_addr_space_name (address_space), name);
6205 error ("%qs combined with %<register%> qualifier for %qE",
6206 c_addr_space_name (address_space), name);
6209 if (current_function_scope)
6211 error ("%qs specified for auto variable %qE",
6212 c_addr_space_name (address_space), name);
6224 else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE)
6227 error ("%qs specified for parameter %qE",
6228 c_addr_space_name (address_space), name);
6230 error ("%qs specified for unnamed parameter",
6231 c_addr_space_name (address_space));
6233 else if (decl_context == FIELD)
6236 error ("%qs specified for structure field %qE",
6237 c_addr_space_name (address_space), name);
6239 error ("%qs specified for structure field",
6240 c_addr_space_name (address_space));
6244 /* Check the type and width of a bit-field. */
6247 check_bitfield_type_and_width (loc, &type, width, name);
6248 /* C11 makes it implementation-defined (6.7.2.1#5) whether
6249 atomic types are permitted for bit-fields; we have no code to
6250 make bit-field accesses atomic, so disallow them. */
6251 if (type_quals & TYPE_QUAL_ATOMIC)
6254 error_at (loc, "bit-field %qE has atomic type", name);
6256 error_at (loc, "bit-field has atomic type");
6257 type_quals &= ~TYPE_QUAL_ATOMIC;
6261 /* Reject invalid uses of _Alignas. */
6262 if (declspecs->alignas_p)
6264 if (storage_class == csc_typedef)
6265 error_at (loc, "alignment specified for typedef %qE", name);
6266 else if (storage_class == csc_register)
6267 error_at (loc, "alignment specified for %<register%> object %qE",
6269 else if (decl_context == PARM)
6272 error_at (loc, "alignment specified for parameter %qE", name);
6274 error_at (loc, "alignment specified for unnamed parameter");
6279 error_at (loc, "alignment specified for bit-field %qE", name);
6281 error_at (loc, "alignment specified for unnamed bit-field");
6283 else if (TREE_CODE (type) == FUNCTION_TYPE)
6284 error_at (loc, "alignment specified for function %qE", name);
6285 else if (declspecs->align_log != -1)
6287 alignas_align = 1U << declspecs->align_log;
6288 if (alignas_align < min_align_of_type (type))
6291 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
6292 "alignment of %qE", name);
6294 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
6295 "alignment of unnamed field");
6301 /* Did array size calculations overflow or does the array cover more
6302 than half of the address-space? */
6303 if (TREE_CODE (type) == ARRAY_TYPE
6304 && COMPLETE_TYPE_P (type)
6305 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
6306 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type)))
6309 error_at (loc, "size of array %qE is too large", name);
6311 error_at (loc, "size of unnamed array is too large");
6312 /* If we proceed with the array type as it is, we'll eventually
6313 crash in tree_to_[su]hwi(). */
6314 type = error_mark_node;
6317 /* If this is declaring a typedef name, return a TYPE_DECL. */
6319 if (storage_class == csc_typedef)
6322 if ((type_quals & TYPE_QUAL_ATOMIC)
6323 && TREE_CODE (type) == FUNCTION_TYPE)
6326 "%<_Atomic%>-qualified function type");
6327 type_quals &= ~TYPE_QUAL_ATOMIC;
6329 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
6331 pedwarn (loc, OPT_Wpedantic,
6332 "ISO C forbids qualified function types");
6334 type = c_build_qualified_type (type, type_quals);
6335 decl = build_decl (declarator->id_loc,
6336 TYPE_DECL, declarator->u.id, type);
6337 if (declspecs->explicit_signed_p)
6338 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
6339 if (declspecs->inline_p)
6340 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
6341 if (declspecs->noreturn_p)
6342 pedwarn (loc, 0,"typedef %q+D declared %<_Noreturn%>", decl);
6344 if (warn_cxx_compat && declarator->u.id != NULL_TREE)
6346 struct c_binding *b = I_TAG_BINDING (declarator->u.id);
6349 && b->decl != NULL_TREE
6350 && (B_IN_CURRENT_SCOPE (b)
6351 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
6352 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
6354 warning_at (declarator->id_loc, OPT_Wc___compat,
6355 ("using %qD as both a typedef and a tag is "
6358 if (b->locus != UNKNOWN_LOCATION)
6359 inform (b->locus, "originally defined here");
6366 /* If this is a type name (such as, in a cast or sizeof),
6367 compute the type and return it now. */
6369 if (decl_context == TYPENAME)
6371 /* Note that the grammar rejects storage classes in typenames
6373 gcc_assert (storage_class == csc_none && !threadp
6374 && !declspecs->inline_p && !declspecs->noreturn_p);
6375 if ((type_quals & TYPE_QUAL_ATOMIC)
6376 && TREE_CODE (type) == FUNCTION_TYPE)
6379 "%<_Atomic%>-qualified function type");
6380 type_quals &= ~TYPE_QUAL_ATOMIC;
6382 else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
6384 pedwarn (loc, OPT_Wpedantic,
6385 "ISO C forbids const or volatile function types");
6387 type = c_build_qualified_type (type, type_quals);
6391 if (pedantic && decl_context == FIELD
6392 && variably_modified_type_p (type, NULL_TREE))
6395 pedwarn (loc, OPT_Wpedantic, "a member of a structure or union cannot "
6396 "have a variably modified type");
6399 /* Aside from typedefs and type names (handle above),
6400 `void' at top level (not within pointer)
6401 is allowed only in public variables.
6402 We don't complain about parms either, but that is because
6403 a better error message can be made later. */
6405 if (VOID_TYPE_P (type) && decl_context != PARM
6406 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
6407 && (storage_class == csc_extern
6408 || (current_scope == file_scope
6409 && !(storage_class == csc_static
6410 || storage_class == csc_register)))))
6412 error_at (loc, "variable or field %qE declared void", name);
6413 type = integer_type_node;
6416 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6417 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6422 if (decl_context == PARM)
6425 bool array_parameter_p = false;
6427 /* A parameter declared as an array of T is really a pointer to T.
6428 One declared as a function is really a pointer to a function. */
6430 if (TREE_CODE (type) == ARRAY_TYPE)
6432 /* Transfer const-ness of array into that of type pointed to. */
6433 type = TREE_TYPE (type);
6435 type = c_build_qualified_type (type, type_quals);
6436 type = c_build_pointer_type (type);
6437 type_quals = array_ptr_quals;
6439 type = c_build_qualified_type (type, type_quals);
6441 /* We don't yet implement attributes in this context. */
6442 if (array_ptr_attrs != NULL_TREE)
6443 warning_at (loc, OPT_Wattributes,
6444 "attributes in parameter array declarator ignored");
6446 size_varies = false;
6447 array_parameter_p = true;
6449 else if (TREE_CODE (type) == FUNCTION_TYPE)
6451 if (type_quals & TYPE_QUAL_ATOMIC)
6454 "%<_Atomic%>-qualified function type");
6455 type_quals &= ~TYPE_QUAL_ATOMIC;
6457 else if (type_quals)
6458 pedwarn (loc, OPT_Wpedantic,
6459 "ISO C forbids qualified function types");
6461 type = c_build_qualified_type (type, type_quals);
6462 type = c_build_pointer_type (type);
6463 type_quals = TYPE_UNQUALIFIED;
6465 else if (type_quals)
6466 type = c_build_qualified_type (type, type_quals);
6468 decl = build_decl (declarator->id_loc,
6469 PARM_DECL, declarator->u.id, type);
6471 C_DECL_VARIABLE_SIZE (decl) = 1;
6472 C_ARRAY_PARAMETER (decl) = array_parameter_p;
6474 /* Compute the type actually passed in the parmlist,
6475 for the case where there is no prototype.
6476 (For example, shorts and chars are passed as ints.)
6477 When there is a prototype, this is overridden later. */
6479 if (type == error_mark_node)
6480 promoted_type = type;
6482 promoted_type = c_type_promotes_to (type);
6484 DECL_ARG_TYPE (decl) = promoted_type;
6485 if (declspecs->inline_p)
6486 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
6487 if (declspecs->noreturn_p)
6488 pedwarn (loc, 0, "parameter %q+D declared %<_Noreturn%>", decl);
6490 else if (decl_context == FIELD)
6492 /* Note that the grammar rejects storage classes in typenames
6494 gcc_assert (storage_class == csc_none && !threadp
6495 && !declspecs->inline_p && !declspecs->noreturn_p);
6497 /* Structure field. It may not be a function. */
6499 if (TREE_CODE (type) == FUNCTION_TYPE)
6501 error_at (loc, "field %qE declared as a function", name);
6502 type = build_pointer_type (type);
6504 else if (TREE_CODE (type) != ERROR_MARK
6505 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
6508 error_at (loc, "field %qE has incomplete type", name);
6510 error_at (loc, "unnamed field has incomplete type");
6511 type = error_mark_node;
6513 else if (TREE_CODE (type) == ARRAY_TYPE
6514 && TYPE_DOMAIN (type) == NULL_TREE)
6516 /* We have a flexible array member through a typedef.
6517 Set suitable range. Whether this is a correct position
6518 for a flexible array member will be determined elsewhere. */
6519 if (!in_system_header_at (input_location))
6520 pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not "
6521 "support flexible array members");
6522 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
6523 TYPE_DOMAIN (type) = build_range_type (sizetype, size_zero_node,
6526 type = c_build_qualified_type (type, type_quals);
6527 decl = build_decl (declarator->id_loc,
6528 FIELD_DECL, declarator->u.id, type);
6529 DECL_NONADDRESSABLE_P (decl) = bitfield;
6530 if (bitfield && !declarator->u.id)
6531 TREE_NO_WARNING (decl) = 1;
6534 C_DECL_VARIABLE_SIZE (decl) = 1;
6536 else if (TREE_CODE (type) == FUNCTION_TYPE)
6538 if (storage_class == csc_register || threadp)
6540 error_at (loc, "invalid storage class for function %qE", name);
6542 else if (current_scope != file_scope)
6544 /* Function declaration not at file scope. Storage
6545 classes other than `extern' are not allowed, C99
6546 6.7.1p5, and `extern' makes no difference. However,
6547 GCC allows 'auto', perhaps with 'inline', to support
6548 nested functions. */
6549 if (storage_class == csc_auto)
6550 pedwarn (loc, OPT_Wpedantic,
6551 "invalid storage class for function %qE", name);
6552 else if (storage_class == csc_static)
6554 error_at (loc, "invalid storage class for function %qE", name);
6556 storage_class = declspecs->storage_class = csc_none;
6562 decl = build_decl (declarator->id_loc,
6563 FUNCTION_DECL, declarator->u.id, type);
6564 decl = build_decl_attribute_variant (decl, decl_attr);
6566 if (type_quals & TYPE_QUAL_ATOMIC)
6569 "%<_Atomic%>-qualified function type");
6570 type_quals &= ~TYPE_QUAL_ATOMIC;
6572 else if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
6573 pedwarn (loc, OPT_Wpedantic,
6574 "ISO C forbids qualified function types");
6576 /* Every function declaration is an external reference
6577 (DECL_EXTERNAL) except for those which are not at file
6578 scope and are explicitly declared "auto". This is
6579 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6580 GCC to signify a forward declaration of a nested function. */
6581 if (storage_class == csc_auto && current_scope != file_scope)
6582 DECL_EXTERNAL (decl) = 0;
6583 /* In C99, a function which is declared 'inline' with 'extern'
6584 is not an external reference (which is confusing). It
6585 means that the later definition of the function must be output
6586 in this file, C99 6.7.4p6. In GNU C89, a function declared
6587 'extern inline' is an external reference. */
6588 else if (declspecs->inline_p && storage_class != csc_static)
6589 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
6590 == flag_gnu89_inline);
6592 DECL_EXTERNAL (decl) = !initialized;
6594 /* Record absence of global scope for `static' or `auto'. */
6596 = !(storage_class == csc_static || storage_class == csc_auto);
6598 /* For a function definition, record the argument information
6599 block where store_parm_decls will look for it. */
6601 current_function_arg_info = arg_info;
6603 if (declspecs->default_int_p)
6604 C_FUNCTION_IMPLICIT_INT (decl) = 1;
6606 /* Record presence of `inline' and `_Noreturn', if it is
6608 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
6610 if (declspecs->inline_p)
6611 pedwarn (loc, 0, "cannot inline function %<main%>");
6612 if (declspecs->noreturn_p)
6613 pedwarn (loc, 0, "%<main%> declared %<_Noreturn%>");
6617 if (declspecs->inline_p)
6618 /* Record that the function is declared `inline'. */
6619 DECL_DECLARED_INLINE_P (decl) = 1;
6620 if (declspecs->noreturn_p)
6623 pedwarn_c99 (loc, OPT_Wpedantic,
6624 "ISO C99 does not support %<_Noreturn%>");
6626 pedwarn_c99 (loc, OPT_Wpedantic,
6627 "ISO C90 does not support %<_Noreturn%>");
6628 TREE_THIS_VOLATILE (decl) = 1;
6634 /* It's a variable. */
6635 /* An uninitialized decl with `extern' is a reference. */
6636 int extern_ref = !initialized && storage_class == csc_extern;
6638 type = c_build_qualified_type (type, type_quals);
6640 /* C99 6.2.2p7: It is invalid (compile-time undefined
6641 behavior) to create an 'extern' declaration for a
6642 variable if there is a global declaration that is
6643 'static' and the global declaration is not visible.
6644 (If the static declaration _is_ currently visible,
6645 the 'extern' declaration is taken to refer to that decl.) */
6646 if (extern_ref && current_scope != file_scope)
6648 tree global_decl = identifier_global_value (declarator->u.id);
6649 tree visible_decl = lookup_name (declarator->u.id);
6652 && global_decl != visible_decl
6653 && VAR_P (global_decl)
6654 && !TREE_PUBLIC (global_decl))
6655 error_at (loc, "variable previously declared %<static%> "
6656 "redeclared %<extern%>");
6659 decl = build_decl (declarator->id_loc,
6660 VAR_DECL, declarator->u.id, type);
6662 C_DECL_VARIABLE_SIZE (decl) = 1;
6664 if (declspecs->inline_p)
6665 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
6666 if (declspecs->noreturn_p)
6667 pedwarn (loc, 0, "variable %q+D declared %<_Noreturn%>", decl);
6669 /* At file scope, an initialized extern declaration may follow
6670 a static declaration. In that case, DECL_EXTERNAL will be
6671 reset later in start_decl. */
6672 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
6674 /* At file scope, the presence of a `static' or `register' storage
6675 class specifier, or the absence of all storage class specifiers
6676 makes this declaration a definition (perhaps tentative). Also,
6677 the absence of `static' makes it public. */
6678 if (current_scope == file_scope)
6680 TREE_PUBLIC (decl) = storage_class != csc_static;
6681 TREE_STATIC (decl) = !extern_ref;
6683 /* Not at file scope, only `static' makes a static definition. */
6686 TREE_STATIC (decl) = (storage_class == csc_static);
6687 TREE_PUBLIC (decl) = extern_ref;
6691 set_decl_tls_model (decl, decl_default_tls_model (decl));
6694 if ((storage_class == csc_extern
6695 || (storage_class == csc_none
6696 && TREE_CODE (type) == FUNCTION_TYPE
6698 && variably_modified_type_p (type, NULL_TREE))
6701 if (TREE_CODE (type) == FUNCTION_TYPE)
6702 error_at (loc, "non-nested function with variably modified type");
6704 error_at (loc, "object with variably modified type must have "
6708 /* Record `register' declaration for warnings on &
6709 and in case doing stupid register allocation. */
6711 if (storage_class == csc_register)
6713 C_DECL_REGISTER (decl) = 1;
6714 DECL_REGISTER (decl) = 1;
6717 /* Record constancy and volatility. */
6718 c_apply_type_quals_to_decl (type_quals, decl);
6720 /* Apply _Alignas specifiers. */
6723 DECL_ALIGN (decl) = alignas_align * BITS_PER_UNIT;
6724 DECL_USER_ALIGN (decl) = 1;
6727 /* If a type has volatile components, it should be stored in memory.
6728 Otherwise, the fact that those components are volatile
6729 will be ignored, and would even crash the compiler.
6730 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6731 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
6732 && (VAR_P (decl) || TREE_CODE (decl) == PARM_DECL
6733 || TREE_CODE (decl) == RESULT_DECL))
6735 /* It is not an error for a structure with volatile fields to
6736 be declared register, but reset DECL_REGISTER since it
6737 cannot actually go in a register. */
6738 int was_reg = C_DECL_REGISTER (decl);
6739 C_DECL_REGISTER (decl) = 0;
6740 DECL_REGISTER (decl) = 0;
6741 c_mark_addressable (decl);
6742 C_DECL_REGISTER (decl) = was_reg;
6745 /* This is the earliest point at which we might know the assembler
6746 name of a variable. Thus, if it's known before this, die horribly. */
6747 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
6751 && TREE_PUBLIC (decl)
6752 && TREE_STATIC (decl)
6753 && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
6754 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
6755 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
6756 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
6757 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
6758 ("non-local variable %qD with anonymous type is "
6759 "questionable in C++"),
6766 /* Decode the parameter-list info for a function type or function definition.
6767 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6768 if there is an identifier list instead of a parameter decl list).
6769 These two functions are separate because when a function returns
6770 or receives functions then each is called multiple times but the order
6771 of calls is different. The last call to `grokparms' is always the one
6772 that contains the formal parameter names of a function definition.
6774 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6776 FUNCDEF_FLAG is true for a function definition, false for
6777 a mere declaration. A nonempty identifier-list gets an error message
6778 when FUNCDEF_FLAG is false. */
6781 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
6783 tree arg_types = arg_info->types;
6785 if (funcdef_flag && arg_info->had_vla_unspec)
6787 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6789 error ("%<[*]%> not allowed in other than function prototype scope");
6792 if (arg_types == 0 && !funcdef_flag
6793 && !in_system_header_at (input_location))
6794 warning (OPT_Wstrict_prototypes,
6795 "function declaration isn%'t a prototype");
6797 if (arg_types == error_mark_node)
6798 return 0; /* don't set TYPE_ARG_TYPES in this case */
6800 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
6804 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
6805 arg_info->parms = NULL_TREE;
6808 arg_info->parms = arg_info->types;
6810 arg_info->types = 0;
6815 tree parm, type, typelt;
6816 unsigned int parmno;
6819 /* If there is a parameter of incomplete type in a definition,
6820 this is an error. In a declaration this is valid, and a
6821 struct or union type may be completed later, before any calls
6822 or definition of the function. In the case where the tag was
6823 first declared within the parameter list, a warning has
6824 already been given. If a parameter has void type, then
6825 however the function cannot be defined or called, so
6828 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
6830 parm = DECL_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
6832 type = TREE_VALUE (typelt);
6833 if (type == error_mark_node)
6836 if (!COMPLETE_TYPE_P (type))
6840 if (DECL_NAME (parm))
6841 error_at (input_location,
6842 "parameter %u (%q+D) has incomplete type",
6845 error_at (DECL_SOURCE_LOCATION (parm),
6846 "parameter %u has incomplete type",
6849 TREE_VALUE (typelt) = error_mark_node;
6850 TREE_TYPE (parm) = error_mark_node;
6851 arg_types = NULL_TREE;
6853 else if (VOID_TYPE_P (type))
6855 if (DECL_NAME (parm))
6856 warning_at (input_location, 0,
6857 "parameter %u (%q+D) has void type",
6860 warning_at (DECL_SOURCE_LOCATION (parm), 0,
6861 "parameter %u has void type",
6866 errmsg = targetm.invalid_parameter_type (type);
6870 TREE_VALUE (typelt) = error_mark_node;
6871 TREE_TYPE (parm) = error_mark_node;
6872 arg_types = NULL_TREE;
6875 if (DECL_NAME (parm) && TREE_USED (parm))
6876 warn_if_shadowing (parm);
6882 /* Allocate and initialize a c_arg_info structure from the parser's
6886 build_arg_info (void)
6888 struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info);
6889 ret->parms = NULL_TREE;
6891 ret->types = NULL_TREE;
6892 ret->others = NULL_TREE;
6893 ret->pending_sizes = NULL;
6894 ret->had_vla_unspec = 0;
6898 /* Take apart the current scope and return a c_arg_info structure with
6899 info on a parameter list just parsed.
6901 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6903 ELLIPSIS being true means the argument list ended in '...' so don't
6904 append a sentinel (void_list_node) to the end of the type-list.
6906 EXPR is NULL or an expression that needs to be evaluated for the
6907 side effects of array size expressions in the parameters. */
6910 get_parm_info (bool ellipsis, tree expr)
6912 struct c_binding *b = current_scope->bindings;
6913 struct c_arg_info *arg_info = build_arg_info ();
6916 vec<c_arg_tag, va_gc> *tags = NULL;
6920 bool gave_void_only_once_err = false;
6922 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
6924 /* The bindings in this scope must not get put into a block.
6925 We will take care of deleting the binding nodes. */
6926 current_scope->bindings = 0;
6928 /* This function is only called if there was *something* on the
6932 /* A parameter list consisting solely of 'void' indicates that the
6933 function takes no arguments. But if the 'void' is qualified
6934 (by 'const' or 'volatile'), or has a storage class specifier
6935 ('register'), then the behavior is undefined; issue an error.
6936 Typedefs for 'void' are OK (see DR#157). */
6937 if (b->prev == 0 /* one binding */
6938 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
6939 && !DECL_NAME (b->decl) /* anonymous */
6940 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
6942 if (TYPE_QUALS (TREE_TYPE (b->decl)) != TYPE_UNQUALIFIED
6943 || C_DECL_REGISTER (b->decl))
6944 error ("%<void%> as only parameter may not be qualified");
6946 /* There cannot be an ellipsis. */
6948 error ("%<void%> must be the only parameter");
6950 arg_info->types = void_list_node;
6955 types = void_list_node;
6957 /* Break up the bindings list into parms, tags, types, and others;
6958 apply sanity checks; purge the name-to-decl bindings. */
6961 tree decl = b->decl;
6962 tree type = TREE_TYPE (decl);
6964 const char *keyword;
6966 switch (TREE_CODE (decl))
6971 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6972 I_SYMBOL_BINDING (b->id) = b->shadowed;
6975 /* Check for forward decls that never got their actual decl. */
6976 if (TREE_ASM_WRITTEN (decl))
6977 error ("parameter %q+D has just a forward declaration", decl);
6978 /* Check for (..., void, ...) and issue an error. */
6979 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
6981 if (!gave_void_only_once_err)
6983 error ("%<void%> must be the only parameter");
6984 gave_void_only_once_err = true;
6989 /* Valid parameter, add it to the list. */
6990 DECL_CHAIN (decl) = parms;
6993 /* Since there is a prototype, args are passed in their
6994 declared types. The back end may override this later. */
6995 DECL_ARG_TYPE (decl) = type;
6996 types = tree_cons (0, type, types);
7000 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
7001 case UNION_TYPE: keyword = "union"; goto tag;
7002 case RECORD_TYPE: keyword = "struct"; goto tag;
7004 /* Types may not have tag-names, in which case the type
7005 appears in the bindings list with b->id NULL. */
7008 gcc_assert (I_TAG_BINDING (b->id) == b);
7009 I_TAG_BINDING (b->id) = b->shadowed;
7012 /* Warn about any struct, union or enum tags defined in a
7013 parameter list. The scope of such types is limited to
7014 the parameter list, which is rarely if ever desirable
7015 (it's impossible to call such a function with type-
7016 correct arguments). An anonymous union parm type is
7017 meaningful as a GNU extension, so don't warn for that. */
7018 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
7021 /* The %s will be one of 'struct', 'union', or 'enum'. */
7022 warning_at (input_location, 0,
7023 "%<%s %E%> declared inside parameter list"
7024 " will not be visible outside of this definition or"
7025 " declaration", keyword, b->id);
7027 /* The %s will be one of 'struct', 'union', or 'enum'. */
7028 warning_at (input_location, 0,
7029 "anonymous %s declared inside parameter list"
7030 " will not be visible outside of this definition or"
7031 " declaration", keyword);
7036 vec_safe_push (tags, tag);
7042 /* CONST_DECLs appear here when we have an embedded enum,
7043 and TYPE_DECLs appear here when we have an embedded struct
7044 or union. No warnings for this - we already warned about the
7045 type itself. FUNCTION_DECLs appear when there is an implicit
7046 function declaration in the parameter list. */
7048 /* When we reinsert this decl in the function body, we need
7049 to reconstruct whether it was marked as nested. */
7050 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7053 DECL_CHAIN (decl) = others;
7058 /* error_mark_node appears here when we have an undeclared
7059 variable. Just throw it away. */
7062 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
7063 I_SYMBOL_BINDING (b->id) = b->shadowed;
7067 /* Other things that might be encountered. */
7074 b = free_binding_and_advance (b);
7077 arg_info->parms = parms;
7078 arg_info->tags = tags;
7079 arg_info->types = types;
7080 arg_info->others = others;
7081 arg_info->pending_sizes = expr;
7085 /* Get the struct, enum or union (CODE says which) with tag NAME.
7086 Define the tag as a forward-reference with location LOC if it is
7087 not defined. Return a c_typespec structure for the type
7091 parser_xref_tag (location_t loc, enum tree_code code, tree name)
7093 struct c_typespec ret;
7097 ret.expr = NULL_TREE;
7098 ret.expr_const_operands = true;
7100 /* If a cross reference is requested, look up the type
7101 already defined for this tag and return it. */
7103 ref = lookup_tag (code, name, false, &refloc);
7104 /* If this is the right type of tag, return what we found.
7105 (This reference will be shadowed by shadow_tag later if appropriate.)
7106 If this is the wrong type of tag, do not return it. If it was the
7107 wrong type in the same scope, we will have had an error
7108 message already; if in a different scope and declaring
7109 a name, pending_xref_error will give an error message; but if in a
7110 different scope and not declaring a name, this tag should
7111 shadow the previous declaration of a different type of tag, and
7112 this would not work properly if we return the reference found.
7113 (For example, with "struct foo" in an outer scope, "union foo;"
7114 must shadow that tag with a new one of union type.) */
7115 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
7116 if (ref && TREE_CODE (ref) == code)
7118 if (C_TYPE_DEFINED_IN_STRUCT (ref)
7119 && loc != UNKNOWN_LOCATION
7125 warning_at (loc, OPT_Wc___compat,
7126 ("enum type defined in struct or union "
7127 "is not visible in C++"));
7128 inform (refloc, "enum type defined here");
7131 warning_at (loc, OPT_Wc___compat,
7132 ("struct defined in struct or union "
7133 "is not visible in C++"));
7134 inform (refloc, "struct defined here");
7137 warning_at (loc, OPT_Wc___compat,
7138 ("union defined in struct or union "
7139 "is not visible in C++"));
7140 inform (refloc, "union defined here");
7151 /* If no such tag is yet defined, create a forward-reference node
7152 and record it as the "definition".
7153 When a real declaration of this type is found,
7154 the forward-reference will be altered into a real type. */
7156 ref = make_node (code);
7157 if (code == ENUMERAL_TYPE)
7159 /* Give the type a default layout like unsigned int
7160 to avoid crashing if it does not get defined. */
7161 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
7162 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
7163 TYPE_USER_ALIGN (ref) = 0;
7164 TYPE_UNSIGNED (ref) = 1;
7165 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
7166 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
7167 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
7170 pushtag (loc, name, ref);
7176 /* Get the struct, enum or union (CODE says which) with tag NAME.
7177 Define the tag as a forward-reference if it is not defined.
7178 Return a tree for the type. */
7181 xref_tag (enum tree_code code, tree name)
7183 return parser_xref_tag (input_location, code, name).spec;
7186 /* Make sure that the tag NAME is defined *in the current scope*
7187 at least as a forward reference.
7188 LOC is the location of the struct's definition.
7189 CODE says which kind of tag NAME ought to be.
7191 This stores the current value of the file static STRUCT_PARSE_INFO
7192 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
7193 new c_struct_parse_info structure. The old value of
7194 STRUCT_PARSE_INFO is restored in finish_struct. */
7197 start_struct (location_t loc, enum tree_code code, tree name,
7198 struct c_struct_parse_info **enclosing_struct_parse_info)
7200 /* If there is already a tag defined at this scope
7201 (as a forward reference), just return it. */
7203 tree ref = NULL_TREE;
7204 location_t refloc = UNKNOWN_LOCATION;
7206 if (name != NULL_TREE)
7207 ref = lookup_tag (code, name, true, &refloc);
7208 if (ref && TREE_CODE (ref) == code)
7210 if (TYPE_SIZE (ref))
7212 if (code == UNION_TYPE)
7213 error_at (loc, "redefinition of %<union %E%>", name);
7215 error_at (loc, "redefinition of %<struct %E%>", name);
7216 if (refloc != UNKNOWN_LOCATION)
7217 inform (refloc, "originally defined here");
7218 /* Don't create structures using a name already in use. */
7221 else if (C_TYPE_BEING_DEFINED (ref))
7223 if (code == UNION_TYPE)
7224 error_at (loc, "nested redefinition of %<union %E%>", name);
7226 error_at (loc, "nested redefinition of %<struct %E%>", name);
7227 /* Don't bother to report "originally defined here" for a
7228 nested redefinition; the original definition should be
7230 /* Don't create structures that contain themselves. */
7235 /* Otherwise create a forward-reference just so the tag is in scope. */
7237 if (ref == NULL_TREE || TREE_CODE (ref) != code)
7239 ref = make_node (code);
7240 pushtag (loc, name, ref);
7243 C_TYPE_BEING_DEFINED (ref) = 1;
7244 TYPE_PACKED (ref) = flag_pack_struct;
7246 *enclosing_struct_parse_info = struct_parse_info;
7247 struct_parse_info = XNEW (struct c_struct_parse_info);
7248 struct_parse_info->struct_types.create (0);
7249 struct_parse_info->fields.create (0);
7250 struct_parse_info->typedefs_seen.create (0);
7252 /* FIXME: This will issue a warning for a use of a type defined
7253 within a statement expr used within sizeof, et. al. This is not
7254 terribly serious as C++ doesn't permit statement exprs within
7256 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7257 warning_at (loc, OPT_Wc___compat,
7258 "defining type in %qs expression is invalid in C++",
7261 : (in_typeof ? "typeof" : "alignof")));
7266 /* Process the specs, declarator and width (NULL if omitted)
7267 of a structure component, returning a FIELD_DECL node.
7268 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
7269 DECL_ATTRS is as for grokdeclarator.
7271 LOC is the location of the structure component.
7273 This is done during the parsing of the struct declaration.
7274 The FIELD_DECL nodes are chained together and the lot of them
7275 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
7278 grokfield (location_t loc,
7279 struct c_declarator *declarator, struct c_declspecs *declspecs,
7280 tree width, tree *decl_attrs)
7284 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
7285 && width == NULL_TREE)
7287 /* This is an unnamed decl.
7289 If we have something of the form "union { list } ;" then this
7290 is the anonymous union extension. Similarly for struct.
7292 If this is something of the form "struct foo;", then
7293 If MS or Plan 9 extensions are enabled, this is handled as
7294 an anonymous struct.
7295 Otherwise this is a forward declaration of a structure tag.
7297 If this is something of the form "foo;" and foo is a TYPE_DECL, then
7298 If foo names a structure or union without a tag, then this
7299 is an anonymous struct (this is permitted by C11).
7300 If MS or Plan 9 extensions are enabled and foo names a
7301 structure, then again this is an anonymous struct.
7302 Otherwise this is an error.
7304 Oh what a horrid tangled web we weave. I wonder if MS consciously
7305 took this from Plan 9 or if it was an accident of implementation
7306 that took root before someone noticed the bug... */
7308 tree type = declspecs->type;
7309 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
7310 || TREE_CODE (type) == UNION_TYPE);
7314 && (flag_ms_extensions
7315 || flag_plan9_extensions
7316 || !declspecs->typedef_p))
7318 if (flag_ms_extensions || flag_plan9_extensions)
7320 else if (TYPE_NAME (type) == NULL)
7327 pedwarn (loc, 0, "declaration does not declare anything");
7331 pedwarn_c99 (loc, OPT_Wpedantic,
7332 "ISO C99 doesn%'t support unnamed structs/unions");
7334 pedwarn_c99 (loc, OPT_Wpedantic,
7335 "ISO C90 doesn%'t support unnamed structs/unions");
7338 value = grokdeclarator (declarator, declspecs, FIELD, false,
7339 width ? &width : NULL, decl_attrs, NULL, NULL,
7342 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
7343 DECL_INITIAL (value) = width;
7345 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
7347 /* If we currently have a binding for this field, set the
7348 in_struct field in the binding, so that we warn about lookups
7350 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
7353 /* If the in_struct field is not yet set, push it on a list
7354 to be cleared when this struct is finished. */
7357 struct_parse_info->fields.safe_push (b);
7366 /* Subroutine of detect_field_duplicates: return whether X and Y,
7367 which are both fields in the same struct, have duplicate field
7371 is_duplicate_field (tree x, tree y)
7373 if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y))
7376 /* When using -fplan9-extensions, an anonymous field whose name is a
7377 typedef can duplicate a field name. */
7378 if (flag_plan9_extensions
7379 && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE))
7381 tree xt, xn, yt, yn;
7384 if (DECL_NAME (x) != NULL_TREE)
7386 else if ((TREE_CODE (xt) == RECORD_TYPE || TREE_CODE (xt) == UNION_TYPE)
7387 && TYPE_NAME (xt) != NULL_TREE
7388 && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL)
7389 xn = DECL_NAME (TYPE_NAME (xt));
7394 if (DECL_NAME (y) != NULL_TREE)
7396 else if ((TREE_CODE (yt) == RECORD_TYPE || TREE_CODE (yt) == UNION_TYPE)
7397 && TYPE_NAME (yt) != NULL_TREE
7398 && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL)
7399 yn = DECL_NAME (TYPE_NAME (yt));
7403 if (xn != NULL_TREE && xn == yn)
7410 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7411 to HTAB, giving errors for any duplicates. */
7414 detect_field_duplicates_hash (tree fieldlist,
7415 hash_table<nofree_ptr_hash <tree_node> > *htab)
7420 for (x = fieldlist; x ; x = DECL_CHAIN (x))
7421 if ((y = DECL_NAME (x)) != 0)
7423 slot = htab->find_slot (y, INSERT);
7426 error ("duplicate member %q+D", x);
7427 DECL_NAME (x) = NULL_TREE;
7431 else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7432 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7434 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab);
7436 /* When using -fplan9-extensions, an anonymous field whose
7437 name is a typedef can duplicate a field name. */
7438 if (flag_plan9_extensions
7439 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
7440 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)
7442 tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x)));
7443 slot = htab->find_slot (xn, INSERT);
7445 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x)));
7451 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7452 the list such that this does not present a problem later. */
7455 detect_field_duplicates (tree fieldlist)
7460 /* If the struct is the list of instance variables of an Objective-C
7461 class, then we need to check all the instance variables of
7462 superclasses when checking for duplicates (since you can't have
7463 an instance variable in a subclass with the same name as an
7464 instance variable in a superclass). We pass on this job to the
7465 Objective-C compiler. objc_detect_field_duplicates() will return
7466 false if we are not checking the list of instance variables and
7467 the C frontend should proceed with the standard field duplicate
7468 checks. If we are checking the list of instance variables, the
7469 ObjC frontend will do the check, emit the errors if needed, and
7470 then return true. */
7471 if (c_dialect_objc ())
7472 if (objc_detect_field_duplicates (false))
7475 /* First, see if there are more than "a few" fields.
7476 This is trivially true if there are zero or one fields. */
7477 if (!fieldlist || !DECL_CHAIN (fieldlist))
7482 if (DECL_NAME (x) == NULL_TREE
7483 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7484 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7487 } while (timeout > 0 && x);
7489 /* If there were "few" fields and no anonymous structures or unions,
7490 avoid the overhead of allocating a hash table. Instead just do
7491 the nested traversal thing. */
7494 for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x))
7495 /* When using -fplan9-extensions, we can have duplicates
7496 between typedef names and fields. */
7498 || (flag_plan9_extensions
7499 && DECL_NAME (x) == NULL_TREE
7500 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7501 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7502 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
7503 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL))
7505 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
7506 if (is_duplicate_field (y, x))
7508 error ("duplicate member %q+D", x);
7509 DECL_NAME (x) = NULL_TREE;
7515 hash_table<nofree_ptr_hash <tree_node> > htab (37);
7516 detect_field_duplicates_hash (fieldlist, &htab);
7520 /* Finish up struct info used by -Wc++-compat. */
7523 warn_cxx_compat_finish_struct (tree fieldlist, enum tree_code code,
7524 location_t record_loc)
7528 struct c_binding *b;
7530 if (fieldlist == NULL_TREE)
7532 if (code == RECORD_TYPE)
7533 warning_at (record_loc, OPT_Wc___compat,
7534 "empty struct has size 0 in C, size 1 in C++");
7536 warning_at (record_loc, OPT_Wc___compat,
7537 "empty union has size 0 in C, size 1 in C++");
7540 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7541 the current struct. We do this now at the end of the struct
7542 because the flag is used to issue visibility warnings, and we
7543 only want to issue those warnings if the type is referenced
7544 outside of the struct declaration. */
7545 FOR_EACH_VEC_ELT (struct_parse_info->struct_types, ix, x)
7546 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
7548 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7549 typedefs used when declaring fields in this struct. If the name
7550 of any of the fields is also a typedef name then the struct would
7551 not parse in C++, because the C++ lookup rules say that the
7552 typedef name would be looked up in the context of the struct, and
7553 would thus be the field rather than the typedef. */
7554 if (!struct_parse_info->typedefs_seen.is_empty ()
7555 && fieldlist != NULL_TREE)
7557 /* Use a hash_set<tree> using the name of the typedef. We can use
7558 a hash_set<tree> because identifiers are interned. */
7559 hash_set<tree> tset;
7561 FOR_EACH_VEC_ELT (struct_parse_info->typedefs_seen, ix, x)
7562 tset.add (DECL_NAME (x));
7564 for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x))
7566 if (DECL_NAME (x) != NULL_TREE
7567 && tset.contains (DECL_NAME (x)))
7569 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
7570 ("using %qD as both field and typedef name is "
7573 /* FIXME: It would be nice to report the location where
7574 the typedef name is used. */
7579 /* For each field which has a binding and which was not defined in
7580 an enclosing struct, clear the in_struct field. */
7581 FOR_EACH_VEC_ELT (struct_parse_info->fields, ix, b)
7585 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7586 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7587 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7588 ATTRIBUTES are attributes to be applied to the structure.
7590 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7591 the struct was started. */
7594 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
7595 struct c_struct_parse_info *enclosing_struct_parse_info)
7598 bool toplevel = file_scope == current_scope;
7599 int saw_named_field;
7601 /* If this type was previously laid out as a forward reference,
7602 make sure we lay it out again. */
7606 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7610 for (x = fieldlist; x; x = DECL_CHAIN (x))
7612 if (DECL_NAME (x) != 0)
7615 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7616 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7622 if (TREE_CODE (t) == UNION_TYPE)
7625 pedwarn (loc, OPT_Wpedantic, "union has no named members");
7627 pedwarn (loc, OPT_Wpedantic, "union has no members");
7632 pedwarn (loc, OPT_Wpedantic, "struct has no named members");
7634 pedwarn (loc, OPT_Wpedantic, "struct has no members");
7639 /* Install struct as DECL_CONTEXT of each field decl.
7640 Also process specified field sizes, found in the DECL_INITIAL,
7641 storing 0 there after the type has been changed to precision equal
7642 to its width, rather than the precision of the specified standard
7643 type. (Correct layout requires the original type to have been preserved
7646 saw_named_field = 0;
7647 for (x = fieldlist; x; x = DECL_CHAIN (x))
7649 if (TREE_TYPE (x) == error_mark_node)
7652 DECL_CONTEXT (x) = t;
7654 /* If any field is const, the structure type is pseudo-const. */
7655 if (TREE_READONLY (x))
7656 C_TYPE_FIELDS_READONLY (t) = 1;
7659 /* A field that is pseudo-const makes the structure likewise. */
7660 tree t1 = strip_array_types (TREE_TYPE (x));
7661 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
7662 && C_TYPE_FIELDS_READONLY (t1))
7663 C_TYPE_FIELDS_READONLY (t) = 1;
7666 /* Any field that is volatile means variables of this type must be
7667 treated in some ways as volatile. */
7668 if (TREE_THIS_VOLATILE (x))
7669 C_TYPE_FIELDS_VOLATILE (t) = 1;
7671 /* Any field of nominal variable size implies structure is too. */
7672 if (C_DECL_VARIABLE_SIZE (x))
7673 C_TYPE_VARIABLE_SIZE (t) = 1;
7675 if (DECL_INITIAL (x))
7677 unsigned HOST_WIDE_INT width = tree_to_uhwi (DECL_INITIAL (x));
7678 DECL_SIZE (x) = bitsize_int (width);
7679 DECL_BIT_FIELD (x) = 1;
7680 SET_DECL_C_BIT_FIELD (x);
7684 && (DECL_BIT_FIELD (x)
7685 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
7686 DECL_PACKED (x) = 1;
7688 /* Detect flexible array member in an invalid context. */
7689 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
7690 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
7691 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
7692 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
7694 if (TREE_CODE (t) == UNION_TYPE)
7696 error_at (DECL_SOURCE_LOCATION (x),
7697 "flexible array member in union");
7698 TREE_TYPE (x) = error_mark_node;
7700 else if (DECL_CHAIN (x) != NULL_TREE)
7702 error_at (DECL_SOURCE_LOCATION (x),
7703 "flexible array member not at end of struct");
7704 TREE_TYPE (x) = error_mark_node;
7706 else if (!saw_named_field)
7708 error_at (DECL_SOURCE_LOCATION (x),
7709 "flexible array member in otherwise empty struct");
7710 TREE_TYPE (x) = error_mark_node;
7714 if (pedantic && TREE_CODE (t) == RECORD_TYPE
7715 && flexible_array_type_p (TREE_TYPE (x)))
7716 pedwarn (DECL_SOURCE_LOCATION (x), OPT_Wpedantic,
7717 "invalid use of structure with flexible array member");
7720 || TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7721 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7722 saw_named_field = 1;
7725 detect_field_duplicates (fieldlist);
7727 /* Now we have the nearly final fieldlist. Record it,
7728 then lay out the structure or union (including the fields). */
7730 TYPE_FIELDS (t) = fieldlist;
7734 if (TYPE_SIZE_UNIT (t)
7735 && TREE_CODE (TYPE_SIZE_UNIT (t)) == INTEGER_CST
7736 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t))
7737 && !valid_constant_size_p (TYPE_SIZE_UNIT (t)))
7738 error ("type %qT is too large", t);
7740 /* Give bit-fields their proper types. */
7742 tree *fieldlistp = &fieldlist;
7744 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
7745 && TREE_TYPE (*fieldlistp) != error_mark_node)
7747 unsigned HOST_WIDE_INT width
7748 = tree_to_uhwi (DECL_INITIAL (*fieldlistp));
7749 tree type = TREE_TYPE (*fieldlistp);
7750 if (width != TYPE_PRECISION (type))
7752 TREE_TYPE (*fieldlistp)
7753 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
7754 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
7756 DECL_INITIAL (*fieldlistp) = 0;
7759 fieldlistp = &DECL_CHAIN (*fieldlistp);
7762 /* Now we have the truly final field list.
7763 Store it in this type and in the variants. */
7765 TYPE_FIELDS (t) = fieldlist;
7767 /* If there are lots of fields, sort so we can look through them fast.
7768 We arbitrarily consider 16 or more elts to be "a lot". */
7773 for (x = fieldlist; x; x = DECL_CHAIN (x))
7775 if (len > 15 || DECL_NAME (x) == NULL)
7783 struct lang_type *space;
7784 struct sorted_fields_type *space2;
7786 len += list_length (x);
7788 /* Use the same allocation policy here that make_node uses, to
7789 ensure that this lives as long as the rest of the struct decl.
7790 All decls in an inline function need to be saved. */
7792 space = ggc_cleared_alloc<struct lang_type> ();
7793 space2 = (sorted_fields_type *) ggc_internal_alloc
7794 (sizeof (struct sorted_fields_type) + len * sizeof (tree));
7798 field_array = &space2->elts[0];
7799 for (x = fieldlist; x; x = DECL_CHAIN (x))
7801 field_array[len++] = x;
7803 /* If there is anonymous struct or union, break out of the loop. */
7804 if (DECL_NAME (x) == NULL)
7807 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7810 TYPE_LANG_SPECIFIC (t) = space;
7811 TYPE_LANG_SPECIFIC (t)->s->len = len;
7812 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
7813 qsort (field_array, len, sizeof (tree), field_decl_cmp);
7818 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
7820 TYPE_FIELDS (x) = TYPE_FIELDS (t);
7821 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
7822 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
7823 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
7824 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
7827 /* If this was supposed to be a transparent union, but we can't
7828 make it one, warn and turn off the flag. */
7829 if (TREE_CODE (t) == UNION_TYPE
7830 && TYPE_TRANSPARENT_AGGR (t)
7831 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
7833 TYPE_TRANSPARENT_AGGR (t) = 0;
7834 warning_at (loc, 0, "union cannot be made transparent");
7837 /* If this structure or union completes the type of any previous
7838 variable declaration, lay it out and output its rtl.
7840 Note: C_TYPE_INCOMPLETE_VARS overloads TYPE_VFIELD which is used
7841 in dwarf2out via rest_of_decl_compilation below and means
7842 something totally different. Since we will be clearing
7843 C_TYPE_INCOMPLETE_VARS shortly after we iterate through them,
7844 clear it ahead of time and avoid problems in dwarf2out. Ideally,
7845 C_TYPE_INCOMPLETE_VARS should use some language specific
7847 tree incomplete_vars = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
7848 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
7849 for (x = incomplete_vars; x; x = TREE_CHAIN (x))
7851 tree decl = TREE_VALUE (x);
7852 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
7853 layout_array_type (TREE_TYPE (decl));
7854 if (TREE_CODE (decl) != TYPE_DECL)
7856 layout_decl (decl, 0);
7857 if (c_dialect_objc ())
7858 objc_check_decl (decl);
7859 rest_of_decl_compilation (decl, toplevel, 0);
7863 /* Update type location to the one of the definition, instead of e.g.
7864 a forward declaration. */
7865 if (TYPE_STUB_DECL (t))
7866 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
7868 /* Finish debugging output for this type. */
7869 rest_of_type_compilation (t, toplevel);
7871 /* If we're inside a function proper, i.e. not file-scope and not still
7872 parsing parameters, then arrange for the size of a variable sized type
7874 if (building_stmt_list_p () && variably_modified_type_p (t, NULL_TREE))
7875 add_stmt (build_stmt (loc,
7876 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
7878 if (warn_cxx_compat)
7879 warn_cxx_compat_finish_struct (fieldlist, TREE_CODE (t), loc);
7881 struct_parse_info->struct_types.release ();
7882 struct_parse_info->fields.release ();
7883 struct_parse_info->typedefs_seen.release ();
7884 XDELETE (struct_parse_info);
7886 struct_parse_info = enclosing_struct_parse_info;
7888 /* If this struct is defined inside a struct, add it to
7891 && struct_parse_info != NULL
7892 && !in_sizeof && !in_typeof && !in_alignof)
7893 struct_parse_info->struct_types.safe_push (t);
7898 /* Lay out the type T, and its element type, and so on. */
7901 layout_array_type (tree t)
7903 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
7904 layout_array_type (TREE_TYPE (t));
7908 /* Begin compiling the definition of an enumeration type.
7909 NAME is its name (or null if anonymous).
7910 LOC is the enum's location.
7911 Returns the type object, as yet incomplete.
7912 Also records info about it so that build_enumerator
7913 may be used to declare the individual values as they are read. */
7916 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
7918 tree enumtype = NULL_TREE;
7919 location_t enumloc = UNKNOWN_LOCATION;
7921 /* If this is the real definition for a previous forward reference,
7922 fill in the contents in the same object that used to be the
7923 forward reference. */
7925 if (name != NULL_TREE)
7926 enumtype = lookup_tag (ENUMERAL_TYPE, name, true, &enumloc);
7928 if (enumtype == NULL_TREE || TREE_CODE (enumtype) != ENUMERAL_TYPE)
7930 enumtype = make_node (ENUMERAL_TYPE);
7931 pushtag (loc, name, enumtype);
7934 if (C_TYPE_BEING_DEFINED (enumtype))
7935 error_at (loc, "nested redefinition of %<enum %E%>", name);
7937 C_TYPE_BEING_DEFINED (enumtype) = 1;
7939 if (TYPE_VALUES (enumtype) != 0)
7941 /* This enum is a named one that has been declared already. */
7942 error_at (loc, "redeclaration of %<enum %E%>", name);
7943 if (enumloc != UNKNOWN_LOCATION)
7944 inform (enumloc, "originally defined here");
7946 /* Completely replace its old definition.
7947 The old enumerators remain defined, however. */
7948 TYPE_VALUES (enumtype) = 0;
7951 the_enum->enum_next_value = integer_zero_node;
7952 the_enum->enum_overflow = 0;
7954 if (flag_short_enums)
7955 for (tree v = TYPE_MAIN_VARIANT (enumtype); v; v = TYPE_NEXT_VARIANT (v))
7956 TYPE_PACKED (v) = 1;
7958 /* FIXME: This will issue a warning for a use of a type defined
7959 within sizeof in a statement expr. This is not terribly serious
7960 as C++ doesn't permit statement exprs within sizeof anyhow. */
7961 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7962 warning_at (loc, OPT_Wc___compat,
7963 "defining type in %qs expression is invalid in C++",
7966 : (in_typeof ? "typeof" : "alignof")));
7971 /* After processing and defining all the values of an enumeration type,
7972 install their decls in the enumeration type and finish it off.
7973 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7974 and ATTRIBUTES are the specified attributes.
7975 Returns ENUMTYPE. */
7978 finish_enum (tree enumtype, tree values, tree attributes)
7981 tree minnode = 0, maxnode = 0;
7984 bool toplevel = (file_scope == current_scope);
7985 struct lang_type *lt;
7987 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7989 /* Calculate the maximum value of any enumerator in this type. */
7991 if (values == error_mark_node)
7992 minnode = maxnode = integer_zero_node;
7995 minnode = maxnode = TREE_VALUE (values);
7996 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
7998 tree value = TREE_VALUE (pair);
7999 if (tree_int_cst_lt (maxnode, value))
8001 if (tree_int_cst_lt (value, minnode))
8006 /* Construct the final type of this enumeration. It is the same
8007 as one of the integral types - the narrowest one that fits, except
8008 that normally we only go as narrow as int - and signed iff any of
8009 the values are negative. */
8010 sign = (tree_int_cst_sgn (minnode) >= 0) ? UNSIGNED : SIGNED;
8011 precision = MAX (tree_int_cst_min_precision (minnode, sign),
8012 tree_int_cst_min_precision (maxnode, sign));
8014 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
8016 tem = c_common_type_for_size (precision, sign == UNSIGNED ? 1 : 0);
8019 warning (0, "enumeration values exceed range of largest integer");
8020 tem = long_long_integer_type_node;
8024 tem = sign == UNSIGNED ? unsigned_type_node : integer_type_node;
8026 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
8027 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
8028 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
8029 TYPE_ALIGN (enumtype) = TYPE_ALIGN (tem);
8030 TYPE_SIZE (enumtype) = 0;
8032 /* If the precision of the type was specified with an attribute and it
8033 was too small, give an error. Otherwise, use it. */
8034 if (TYPE_PRECISION (enumtype)
8035 && lookup_attribute ("mode", attributes))
8037 if (precision > TYPE_PRECISION (enumtype))
8038 error ("specified mode too small for enumeral values");
8041 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
8043 layout_type (enumtype);
8045 if (values != error_mark_node)
8047 /* Change the type of the enumerators to be the enum type. We
8048 need to do this irrespective of the size of the enum, for
8049 proper type checking. Replace the DECL_INITIALs of the
8050 enumerators, and the value slots of the list, with copies
8051 that have the enum type; they cannot be modified in place
8052 because they may be shared (e.g. integer_zero_node) Finally,
8053 change the purpose slots to point to the names of the decls. */
8054 for (pair = values; pair; pair = TREE_CHAIN (pair))
8056 tree enu = TREE_PURPOSE (pair);
8057 tree ini = DECL_INITIAL (enu);
8059 TREE_TYPE (enu) = enumtype;
8061 /* The ISO C Standard mandates enumerators to have type int,
8062 even though the underlying type of an enum type is
8063 unspecified. However, GCC allows enumerators of any
8064 integer type as an extensions. build_enumerator()
8065 converts any enumerators that fit in an int to type int,
8066 to avoid promotions to unsigned types when comparing
8067 integers with enumerators that fit in the int range.
8068 When -pedantic is given, build_enumerator() would have
8069 already warned about those that don't fit. Here we
8070 convert the rest to the enumerator type. */
8071 if (TREE_TYPE (ini) != integer_type_node)
8072 ini = convert (enumtype, ini);
8074 DECL_INITIAL (enu) = ini;
8075 TREE_PURPOSE (pair) = DECL_NAME (enu);
8076 TREE_VALUE (pair) = ini;
8079 TYPE_VALUES (enumtype) = values;
8082 /* Record the min/max values so that we can warn about bit-field
8083 enumerations that are too small for the values. */
8084 lt = ggc_cleared_alloc<struct lang_type> ();
8085 lt->enum_min = minnode;
8086 lt->enum_max = maxnode;
8087 TYPE_LANG_SPECIFIC (enumtype) = lt;
8089 /* Fix up all variant types of this enum type. */
8090 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
8092 if (tem == enumtype)
8094 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
8095 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
8096 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
8097 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
8098 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
8099 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
8100 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
8101 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
8102 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
8103 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
8104 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
8107 /* Finish debugging output for this type. */
8108 rest_of_type_compilation (enumtype, toplevel);
8110 /* If this enum is defined inside a struct, add it to
8113 && struct_parse_info != NULL
8114 && !in_sizeof && !in_typeof && !in_alignof)
8115 struct_parse_info->struct_types.safe_push (enumtype);
8120 /* Build and install a CONST_DECL for one value of the
8121 current enumeration type (one that was begun with start_enum).
8122 DECL_LOC is the location of the enumerator.
8123 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
8124 Return a tree-list containing the CONST_DECL and its value.
8125 Assignment of sequential values by default is handled here. */
8128 build_enumerator (location_t decl_loc, location_t loc,
8129 struct c_enum_contents *the_enum, tree name, tree value)
8133 /* Validate and default VALUE. */
8137 /* Don't issue more errors for error_mark_node (i.e. an
8138 undeclared identifier) - just ignore the value expression. */
8139 if (value == error_mark_node)
8141 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
8143 error_at (loc, "enumerator value for %qE is not an integer constant",
8149 if (TREE_CODE (value) != INTEGER_CST)
8151 value = c_fully_fold (value, false, NULL);
8152 if (TREE_CODE (value) == INTEGER_CST)
8153 pedwarn (loc, OPT_Wpedantic,
8154 "enumerator value for %qE is not an integer "
8155 "constant expression", name);
8157 if (TREE_CODE (value) != INTEGER_CST)
8159 error ("enumerator value for %qE is not an integer constant",
8165 value = default_conversion (value);
8166 constant_expression_warning (value);
8171 /* Default based on previous value. */
8172 /* It should no longer be possible to have NON_LVALUE_EXPR
8176 value = the_enum->enum_next_value;
8177 if (the_enum->enum_overflow)
8178 error_at (loc, "overflow in enumeration values");
8180 /* Even though the underlying type of an enum is unspecified, the
8181 type of enumeration constants is explicitly defined as int
8182 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
8184 else if (!int_fits_type_p (value, integer_type_node))
8185 pedwarn (loc, OPT_Wpedantic,
8186 "ISO C restricts enumerator values to range of %<int%>");
8188 /* The ISO C Standard mandates enumerators to have type int, even
8189 though the underlying type of an enum type is unspecified.
8190 However, GCC allows enumerators of any integer type as an
8191 extensions. Here we convert any enumerators that fit in an int
8192 to type int, to avoid promotions to unsigned types when comparing
8193 integers with enumerators that fit in the int range. When
8194 -pedantic is given, we would have already warned about those that
8195 don't fit. We have to do this here rather than in finish_enum
8196 because this value may be used to define more enumerators. */
8197 if (int_fits_type_p (value, integer_type_node))
8198 value = convert (integer_type_node, value);
8200 /* Set basis for default for next value. */
8201 the_enum->enum_next_value
8202 = build_binary_op (EXPR_LOC_OR_LOC (value, input_location),
8203 PLUS_EXPR, value, integer_one_node, 0);
8204 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
8206 /* Now create a declaration for the enum value name. */
8208 type = TREE_TYPE (value);
8209 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
8210 TYPE_PRECISION (integer_type_node)),
8211 (TYPE_PRECISION (type)
8212 >= TYPE_PRECISION (integer_type_node)
8213 && TYPE_UNSIGNED (type)));
8215 decl = build_decl (decl_loc, CONST_DECL, name, type);
8216 DECL_INITIAL (decl) = convert (type, value);
8219 return tree_cons (decl, value, NULL_TREE);
8223 /* Create the FUNCTION_DECL for a function definition.
8224 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
8225 the declaration; they describe the function's name and the type it returns,
8226 but twisted together in a fashion that parallels the syntax of C.
8228 This function creates a binding context for the function body
8229 as well as setting up the FUNCTION_DECL in current_function_decl.
8231 Returns 1 on success. If the DECLARATOR is not suitable for a function
8232 (it defines a datum instead), we return 0, which tells
8233 yyparse to report a parse error. */
8236 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
8239 tree decl1, old_decl;
8240 tree restype, resdecl;
8243 current_function_returns_value = 0; /* Assume, until we see it does. */
8244 current_function_returns_null = 0;
8245 current_function_returns_abnormally = 0;
8246 warn_about_return_type = 0;
8247 c_switch_stack = NULL;
8249 /* Indicate no valid break/continue context by setting these variables
8250 to some non-null, non-label value. We'll notice and emit the proper
8251 error message in c_finish_bc_stmt. */
8252 c_break_label = c_cont_label = size_zero_node;
8254 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
8255 &attributes, NULL, NULL, DEPRECATED_NORMAL);
8256 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION, decl1);
8258 /* If the declarator is not suitable for a function definition,
8259 cause a syntax error. */
8261 || TREE_CODE (decl1) != FUNCTION_DECL)
8264 loc = DECL_SOURCE_LOCATION (decl1);
8266 c_decl_attributes (&decl1, attributes, 0);
8268 if (DECL_DECLARED_INLINE_P (decl1)
8269 && DECL_UNINLINABLE (decl1)
8270 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
8271 warning_at (loc, OPT_Wattributes,
8272 "inline function %qD given attribute noinline",
8275 /* Handle gnu_inline attribute. */
8276 if (declspecs->inline_p
8277 && !flag_gnu89_inline
8278 && TREE_CODE (decl1) == FUNCTION_DECL
8279 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
8280 || current_function_decl))
8282 if (declspecs->storage_class != csc_static)
8283 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
8286 announce_function (decl1);
8288 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
8290 error_at (loc, "return type is an incomplete type");
8291 /* Make it return void instead. */
8293 = build_function_type (void_type_node,
8294 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
8297 if (warn_about_return_type)
8298 warn_defaults_to (loc, flag_isoc99 ? OPT_Wimplicit_int
8299 : (warn_return_type ? OPT_Wreturn_type
8300 : OPT_Wimplicit_int),
8301 "return type defaults to %<int%>");
8303 /* Make the init_value nonzero so pushdecl knows this is not tentative.
8304 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
8305 DECL_INITIAL (decl1) = error_mark_node;
8307 /* A nested function is not global. */
8308 if (current_function_decl != 0)
8309 TREE_PUBLIC (decl1) = 0;
8311 /* If this definition isn't a prototype and we had a prototype declaration
8312 before, copy the arg type info from that prototype. */
8313 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
8314 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
8316 current_function_prototype_locus = UNKNOWN_LOCATION;
8317 current_function_prototype_built_in = false;
8318 current_function_prototype_arg_types = NULL_TREE;
8319 if (!prototype_p (TREE_TYPE (decl1)))
8321 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
8322 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
8323 TREE_TYPE (TREE_TYPE (old_decl))))
8325 if (stdarg_p (TREE_TYPE (old_decl)))
8327 warning_at (loc, 0, "%q+D defined as variadic function "
8328 "without prototype", decl1);
8329 locate_old_decl (old_decl);
8331 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
8333 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
8334 current_function_prototype_built_in
8335 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
8336 current_function_prototype_arg_types
8337 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
8339 if (TREE_PUBLIC (decl1))
8341 /* If there is an external prototype declaration of this
8342 function, record its location but do not copy information
8343 to this decl. This may be an invisible declaration
8344 (built-in or in a scope which has finished) or simply
8345 have more refined argument types than any declaration
8347 struct c_binding *b;
8348 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
8349 if (B_IN_SCOPE (b, external_scope))
8353 tree ext_decl, ext_type;
8355 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
8356 if (TREE_CODE (ext_type) == FUNCTION_TYPE
8357 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
8358 TREE_TYPE (ext_type)))
8360 current_function_prototype_locus
8361 = DECL_SOURCE_LOCATION (ext_decl);
8362 current_function_prototype_built_in
8363 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
8364 current_function_prototype_arg_types
8365 = TYPE_ARG_TYPES (ext_type);
8371 /* Optionally warn of old-fashioned def with no previous prototype. */
8372 if (warn_strict_prototypes
8373 && old_decl != error_mark_node
8374 && !prototype_p (TREE_TYPE (decl1))
8375 && C_DECL_ISNT_PROTOTYPE (old_decl))
8376 warning_at (loc, OPT_Wstrict_prototypes,
8377 "function declaration isn%'t a prototype");
8378 /* Optionally warn of any global def with no previous prototype. */
8379 else if (warn_missing_prototypes
8380 && old_decl != error_mark_node
8381 && TREE_PUBLIC (decl1)
8382 && !MAIN_NAME_P (DECL_NAME (decl1))
8383 && C_DECL_ISNT_PROTOTYPE (old_decl)
8384 && !DECL_DECLARED_INLINE_P (decl1))
8385 warning_at (loc, OPT_Wmissing_prototypes,
8386 "no previous prototype for %qD", decl1);
8387 /* Optionally warn of any def with no previous prototype
8388 if the function has already been used. */
8389 else if (warn_missing_prototypes
8391 && old_decl != error_mark_node
8392 && TREE_USED (old_decl)
8393 && !prototype_p (TREE_TYPE (old_decl)))
8394 warning_at (loc, OPT_Wmissing_prototypes,
8395 "%qD was used with no prototype before its definition", decl1);
8396 /* Optionally warn of any global def with no previous declaration. */
8397 else if (warn_missing_declarations
8398 && TREE_PUBLIC (decl1)
8400 && !MAIN_NAME_P (DECL_NAME (decl1))
8401 && !DECL_DECLARED_INLINE_P (decl1))
8402 warning_at (loc, OPT_Wmissing_declarations,
8403 "no previous declaration for %qD",
8405 /* Optionally warn of any def with no previous declaration
8406 if the function has already been used. */
8407 else if (warn_missing_declarations
8409 && old_decl != error_mark_node
8410 && TREE_USED (old_decl)
8411 && C_DECL_IMPLICIT (old_decl))
8412 warning_at (loc, OPT_Wmissing_declarations,
8413 "%qD was used with no declaration before its definition", decl1);
8415 /* This function exists in static storage.
8416 (This does not mean `static' in the C sense!) */
8417 TREE_STATIC (decl1) = 1;
8419 /* This is the earliest point at which we might know the assembler
8420 name of the function. Thus, if it's set before this, die horribly. */
8421 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
8423 /* If #pragma weak was used, mark the decl weak now. */
8424 if (current_scope == file_scope)
8425 maybe_apply_pragma_weak (decl1);
8427 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8428 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
8430 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
8431 != integer_type_node)
8432 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
8433 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1))))
8434 pedwarn (loc, OPT_Wmain, "%<_Atomic%>-qualified return type of %qD",
8437 check_main_parameter_types (decl1);
8439 if (!TREE_PUBLIC (decl1))
8440 pedwarn (loc, OPT_Wmain,
8441 "%qD is normally a non-static function", decl1);
8444 /* Record the decl so that the function name is defined.
8445 If we already have a decl for this name, and it is a FUNCTION_DECL,
8446 use the old decl. */
8448 current_function_decl = pushdecl (decl1);
8451 declare_parm_level ();
8453 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
8454 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
8455 DECL_ARTIFICIAL (resdecl) = 1;
8456 DECL_IGNORED_P (resdecl) = 1;
8457 DECL_RESULT (current_function_decl) = resdecl;
8459 start_fname_decls ();
8464 /* Subroutine of store_parm_decls which handles new-style function
8465 definitions (prototype format). The parms already have decls, so we
8466 need only record them as in effect and complain if any redundant
8467 old-style parm decls were written. */
8469 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
8475 if (current_scope->bindings)
8477 error_at (DECL_SOURCE_LOCATION (fndecl),
8478 "old-style parameter declarations in prototyped "
8479 "function definition");
8481 /* Get rid of the old-style declarations. */
8485 /* Don't issue this warning for nested functions, and don't issue this
8486 warning if we got here because ARG_INFO_TYPES was error_mark_node
8487 (this happens when a function definition has just an ellipsis in
8488 its parameter list). */
8489 else if (!in_system_header_at (input_location)
8490 && !current_function_scope
8491 && arg_info->types != error_mark_node)
8492 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
8493 "traditional C rejects ISO C style function definitions");
8495 /* Now make all the parameter declarations visible in the function body.
8496 We can bypass most of the grunt work of pushdecl. */
8497 for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl))
8499 DECL_CONTEXT (decl) = current_function_decl;
8500 if (DECL_NAME (decl))
8502 bind (DECL_NAME (decl), decl, current_scope,
8503 /*invisible=*/false, /*nested=*/false,
8505 if (!TREE_USED (decl))
8506 warn_if_shadowing (decl);
8509 error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted");
8512 /* Record the parameter list in the function declaration. */
8513 DECL_ARGUMENTS (fndecl) = arg_info->parms;
8515 /* Now make all the ancillary declarations visible, likewise. */
8516 for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl))
8518 DECL_CONTEXT (decl) = current_function_decl;
8519 if (DECL_NAME (decl))
8520 bind (DECL_NAME (decl), decl, current_scope,
8521 /*invisible=*/false,
8522 /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL),
8526 /* And all the tag declarations. */
8527 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
8529 bind (tag->id, tag->type, current_scope,
8530 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
8533 /* Subroutine of store_parm_decls which handles old-style function
8534 definitions (separate parameter list and declarations). */
8537 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
8539 struct c_binding *b;
8540 tree parm, decl, last;
8541 tree parmids = arg_info->parms;
8542 hash_set<tree> seen_args;
8544 if (!in_system_header_at (input_location))
8545 warning_at (DECL_SOURCE_LOCATION (fndecl),
8546 OPT_Wold_style_definition, "old-style function definition");
8548 /* Match each formal parameter name with its declaration. Save each
8549 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8550 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8552 if (TREE_VALUE (parm) == 0)
8554 error_at (DECL_SOURCE_LOCATION (fndecl),
8555 "parameter name missing from parameter list");
8556 TREE_PURPOSE (parm) = 0;
8560 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
8561 if (b && B_IN_CURRENT_SCOPE (b))
8564 /* Skip erroneous parameters. */
8565 if (decl == error_mark_node)
8567 /* If we got something other than a PARM_DECL it is an error. */
8568 if (TREE_CODE (decl) != PARM_DECL)
8569 error_at (DECL_SOURCE_LOCATION (decl),
8570 "%qD declared as a non-parameter", decl);
8571 /* If the declaration is already marked, we have a duplicate
8572 name. Complain and ignore the duplicate. */
8573 else if (seen_args.contains (decl))
8575 error_at (DECL_SOURCE_LOCATION (decl),
8576 "multiple parameters named %qD", decl);
8577 TREE_PURPOSE (parm) = 0;
8580 /* If the declaration says "void", complain and turn it into
8582 else if (VOID_TYPE_P (TREE_TYPE (decl)))
8584 error_at (DECL_SOURCE_LOCATION (decl),
8585 "parameter %qD declared with void type", decl);
8586 TREE_TYPE (decl) = integer_type_node;
8587 DECL_ARG_TYPE (decl) = integer_type_node;
8588 layout_decl (decl, 0);
8590 warn_if_shadowing (decl);
8592 /* If no declaration found, default to int. */
8595 /* FIXME diagnostics: This should be the location of the argument,
8596 not the FNDECL. E.g., for an old-style declaration
8598 int f10(v) { blah; }
8600 We should use the location of the V, not the F10.
8601 Unfortunately, the V is an IDENTIFIER_NODE which has no
8602 location. In the future we need locations for c_arg_info
8605 See gcc.dg/Wshadow-3.c for an example of this problem. */
8606 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
8607 PARM_DECL, TREE_VALUE (parm), integer_type_node);
8608 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
8610 warn_if_shadowing (decl);
8613 pedwarn (DECL_SOURCE_LOCATION (decl),
8614 OPT_Wimplicit_int, "type of %qD defaults to %<int%>",
8617 warning_at (DECL_SOURCE_LOCATION (decl),
8618 OPT_Wmissing_parameter_type,
8619 "type of %qD defaults to %<int%>", decl);
8622 TREE_PURPOSE (parm) = decl;
8623 seen_args.add (decl);
8626 /* Now examine the parms chain for incomplete declarations
8627 and declarations with no corresponding names. */
8629 for (b = current_scope->bindings; b; b = b->prev)
8632 if (TREE_CODE (parm) != PARM_DECL)
8635 if (TREE_TYPE (parm) != error_mark_node
8636 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
8638 error_at (DECL_SOURCE_LOCATION (parm),
8639 "parameter %qD has incomplete type", parm);
8640 TREE_TYPE (parm) = error_mark_node;
8643 if (!seen_args.contains (parm))
8645 error_at (DECL_SOURCE_LOCATION (parm),
8646 "declaration for parameter %qD but no such parameter",
8649 /* Pretend the parameter was not missing.
8650 This gets us to a standard state and minimizes
8651 further error messages. */
8652 parmids = chainon (parmids, tree_cons (parm, 0, 0));
8656 /* Chain the declarations together in the order of the list of
8657 names. Store that chain in the function decl, replacing the
8658 list of names. Update the current scope to match. */
8659 DECL_ARGUMENTS (fndecl) = 0;
8661 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8662 if (TREE_PURPOSE (parm))
8664 if (parm && TREE_PURPOSE (parm))
8666 last = TREE_PURPOSE (parm);
8667 DECL_ARGUMENTS (fndecl) = last;
8669 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
8670 if (TREE_PURPOSE (parm))
8672 DECL_CHAIN (last) = TREE_PURPOSE (parm);
8673 last = TREE_PURPOSE (parm);
8675 DECL_CHAIN (last) = 0;
8678 /* If there was a previous prototype,
8679 set the DECL_ARG_TYPE of each argument according to
8680 the type previously specified, and report any mismatches. */
8682 if (current_function_prototype_arg_types)
8685 for (parm = DECL_ARGUMENTS (fndecl),
8686 type = current_function_prototype_arg_types;
8687 parm || (type && TREE_VALUE (type) != error_mark_node
8688 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
8689 parm = DECL_CHAIN (parm), type = TREE_CHAIN (type))
8691 if (parm == 0 || type == 0
8692 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
8694 if (current_function_prototype_built_in)
8695 warning_at (DECL_SOURCE_LOCATION (fndecl),
8696 0, "number of arguments doesn%'t match "
8697 "built-in prototype");
8700 /* FIXME diagnostics: This should be the location of
8701 FNDECL, but there is bug when a prototype is
8702 declared inside function context, but defined
8703 outside of it (e.g., gcc.dg/pr15698-2.c). In
8704 which case FNDECL gets the location of the
8705 prototype, not the definition. */
8706 error_at (input_location,
8707 "number of arguments doesn%'t match prototype");
8709 error_at (current_function_prototype_locus,
8710 "prototype declaration");
8714 /* Type for passing arg must be consistent with that
8715 declared for the arg. ISO C says we take the unqualified
8716 type for parameters declared with qualified type. */
8717 if (TREE_TYPE (parm) != error_mark_node
8718 && TREE_TYPE (type) != error_mark_node
8719 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
8720 != TYPE_ATOMIC (TREE_VALUE (type)))
8721 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
8722 TYPE_MAIN_VARIANT (TREE_VALUE (type)))))
8724 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
8725 == TYPE_ATOMIC (TREE_VALUE (type)))
8726 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
8727 == TYPE_MAIN_VARIANT (TREE_VALUE (type))))
8729 /* Adjust argument to match prototype. E.g. a previous
8730 `int foo(float);' prototype causes
8731 `int foo(x) float x; {...}' to be treated like
8732 `int foo(float x) {...}'. This is particularly
8733 useful for argument types like uid_t. */
8734 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
8736 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
8737 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
8738 && TYPE_PRECISION (TREE_TYPE (parm))
8739 < TYPE_PRECISION (integer_type_node))
8740 DECL_ARG_TYPE (parm)
8741 = c_type_promotes_to (TREE_TYPE (parm));
8743 /* ??? Is it possible to get here with a
8744 built-in prototype or will it always have
8745 been diagnosed as conflicting with an
8746 old-style definition and discarded? */
8747 if (current_function_prototype_built_in)
8748 warning_at (DECL_SOURCE_LOCATION (parm),
8749 OPT_Wpedantic, "promoted argument %qD "
8750 "doesn%'t match built-in prototype", parm);
8753 pedwarn (DECL_SOURCE_LOCATION (parm),
8754 OPT_Wpedantic, "promoted argument %qD "
8755 "doesn%'t match prototype", parm);
8756 pedwarn (current_function_prototype_locus, OPT_Wpedantic,
8757 "prototype declaration");
8762 if (current_function_prototype_built_in)
8763 warning_at (DECL_SOURCE_LOCATION (parm),
8764 0, "argument %qD doesn%'t match "
8765 "built-in prototype", parm);
8768 error_at (DECL_SOURCE_LOCATION (parm),
8769 "argument %qD doesn%'t match prototype", parm);
8770 error_at (current_function_prototype_locus,
8771 "prototype declaration");
8776 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
8779 /* Otherwise, create a prototype that would match. */
8783 tree actual = 0, last = 0, type;
8785 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm))
8787 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
8789 TREE_CHAIN (last) = type;
8794 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
8796 TREE_CHAIN (last) = type;
8800 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8801 of the type of this function, but we need to avoid having this
8802 affect the types of other similarly-typed functions, so we must
8803 first force the generation of an identical (but separate) type
8804 node for the relevant function type. The new node we create
8805 will be a variant of the main variant of the original function
8808 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
8810 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
8814 /* Store parameter declarations passed in ARG_INFO into the current
8815 function declaration. */
8818 store_parm_decls_from (struct c_arg_info *arg_info)
8820 current_function_arg_info = arg_info;
8821 store_parm_decls ();
8824 /* Called by walk_tree to look for and update context-less labels. */
8827 set_labels_context_r (tree *tp, int *walk_subtrees, void *data)
8829 if (TREE_CODE (*tp) == LABEL_EXPR
8830 && DECL_CONTEXT (LABEL_EXPR_LABEL (*tp)) == NULL_TREE)
8832 DECL_CONTEXT (LABEL_EXPR_LABEL (*tp)) = static_cast<tree>(data);
8839 /* Store the parameter declarations into the current function declaration.
8840 This is called after parsing the parameter declarations, before
8841 digesting the body of the function.
8843 For an old-style definition, construct a prototype out of the old-style
8844 parameter declarations and inject it into the function's type. */
8847 store_parm_decls (void)
8849 tree fndecl = current_function_decl;
8852 /* The argument information block for FNDECL. */
8853 struct c_arg_info *arg_info = current_function_arg_info;
8854 current_function_arg_info = 0;
8856 /* True if this definition is written with a prototype. Note:
8857 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8858 list in a function definition as equivalent to (void) -- an
8859 empty argument list specifies the function has no parameters,
8860 but only (void) sets up a prototype for future calls. */
8861 proto = arg_info->types != 0;
8864 store_parm_decls_newstyle (fndecl, arg_info);
8866 store_parm_decls_oldstyle (fndecl, arg_info);
8868 /* The next call to push_scope will be a function body. */
8870 next_is_function_body = true;
8872 /* Write a record describing this function definition to the prototypes
8873 file (if requested). */
8875 gen_aux_info_record (fndecl, 1, 0, proto);
8877 /* Initialize the RTL code for the function. */
8878 allocate_struct_function (fndecl, false);
8880 if (warn_unused_local_typedefs)
8881 cfun->language = ggc_cleared_alloc<language_function> ();
8883 /* Begin the statement tree for this function. */
8884 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
8886 /* ??? Insert the contents of the pending sizes list into the function
8887 to be evaluated. The only reason left to have this is
8888 void foo(int n, int array[n++])
8889 because we throw away the array type in favor of a pointer type, and
8890 thus won't naturally see the SAVE_EXPR containing the increment. All
8891 other pending sizes would be handled by gimplify_parameters. */
8892 if (arg_info->pending_sizes)
8894 /* In very special circumstances, e.g. for code like
8896 void f (int a[i += 2]) {}
8897 we need to execute the atomic assignment on function entry.
8898 But in this case, it is not just a straight store, it has the
8899 op= form, which means that build_atomic_assign has generated
8900 gotos, labels, etc. Because at that time the function decl
8901 for F has not been created yet, those labels do not have any
8902 function context. But we have the fndecl now, so update the
8903 labels accordingly. gimplify_expr would crash otherwise. */
8904 walk_tree_without_duplicates (&arg_info->pending_sizes,
8905 set_labels_context_r, fndecl);
8906 add_stmt (arg_info->pending_sizes);
8910 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8911 c_finish_omp_declare_simd for function prototypes. No diagnostics
8915 temp_store_parm_decls (tree fndecl, tree parms)
8918 for (tree p = parms; p; p = DECL_CHAIN (p))
8920 DECL_CONTEXT (p) = fndecl;
8922 bind (DECL_NAME (p), p, current_scope,
8923 /*invisible=*/false, /*nested=*/false,
8928 /* Undo what temp_store_parm_decls did. */
8931 temp_pop_parm_decls (void)
8933 /* Clear all bindings in this temporary scope, so that
8934 pop_scope doesn't create a BLOCK. */
8935 struct c_binding *b = current_scope->bindings;
8936 current_scope->bindings = NULL;
8937 for (; b; b = free_binding_and_advance (b))
8939 gcc_assert (TREE_CODE (b->decl) == PARM_DECL
8940 || b->decl == error_mark_node);
8941 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
8942 I_SYMBOL_BINDING (b->id) = b->shadowed;
8943 if (b->shadowed && b->shadowed->u.type)
8944 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
8950 /* Finish up a function declaration and compile that function
8951 all the way to assembler language output. Then free the storage
8952 for the function definition.
8954 This is called after parsing the body of the function definition. */
8957 finish_function (void)
8959 tree fndecl = current_function_decl;
8961 if (c_dialect_objc ())
8962 objc_finish_function ();
8964 if (TREE_CODE (fndecl) == FUNCTION_DECL
8965 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
8967 tree args = DECL_ARGUMENTS (fndecl);
8968 for (; args; args = DECL_CHAIN (args))
8970 tree type = TREE_TYPE (args);
8971 if (INTEGRAL_TYPE_P (type)
8972 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
8973 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
8977 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
8978 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
8980 /* Must mark the RESULT_DECL as being in this function. */
8982 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
8983 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
8985 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
8986 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
8987 == integer_type_node && flag_isoc99)
8989 /* Hack. We don't want the middle-end to warn that this return
8990 is unreachable, so we mark its location as special. Using
8991 UNKNOWN_LOCATION has the problem that it gets clobbered in
8992 annotate_one_with_locus. A cleaner solution might be to
8993 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8995 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
8998 /* Tie off the statement tree for this function. */
8999 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
9001 /* If the function has _Cilk_spawn in front of a function call inside it
9002 i.e. it is a spawning function, then add the appropriate Cilk plus
9003 functions inside. */
9004 if (fn_contains_cilk_spawn_p (cfun))
9005 cfun->cilk_frame_decl = insert_cilk_frame (fndecl);
9007 finish_fname_decls ();
9009 /* Complain if there's just no return statement. */
9010 if (warn_return_type
9011 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
9012 && !current_function_returns_value && !current_function_returns_null
9013 /* Don't complain if we are no-return. */
9014 && !current_function_returns_abnormally
9015 /* Don't complain if we are declared noreturn. */
9016 && !TREE_THIS_VOLATILE (fndecl)
9017 /* Don't warn for main(). */
9018 && !MAIN_NAME_P (DECL_NAME (fndecl))
9019 /* Or if they didn't actually specify a return type. */
9020 && !C_FUNCTION_IMPLICIT_INT (fndecl)
9021 /* Normally, with -Wreturn-type, flow will complain, but we might
9022 optimize out static functions. */
9023 && !TREE_PUBLIC (fndecl))
9025 warning (OPT_Wreturn_type,
9026 "no return statement in function returning non-void");
9027 TREE_NO_WARNING (fndecl) = 1;
9030 /* Complain about parameters that are only set, but never otherwise used. */
9031 if (warn_unused_but_set_parameter)
9035 for (decl = DECL_ARGUMENTS (fndecl);
9037 decl = DECL_CHAIN (decl))
9038 if (TREE_USED (decl)
9039 && TREE_CODE (decl) == PARM_DECL
9040 && !DECL_READ_P (decl)
9042 && !DECL_ARTIFICIAL (decl)
9043 && !TREE_NO_WARNING (decl))
9044 warning_at (DECL_SOURCE_LOCATION (decl),
9045 OPT_Wunused_but_set_parameter,
9046 "parameter %qD set but not used", decl);
9049 /* Complain about locally defined typedefs that are not used in this
9051 maybe_warn_unused_local_typedefs ();
9053 /* Possibly warn about unused parameters. */
9054 if (warn_unused_parameter)
9055 do_warn_unused_parameter (fndecl);
9057 /* Store the end of the function, so that we get good line number
9058 info for the epilogue. */
9059 cfun->function_end_locus = input_location;
9061 /* Finalize the ELF visibility for the function. */
9062 c_determine_visibility (fndecl);
9064 /* For GNU C extern inline functions disregard inline limits. */
9065 if (DECL_EXTERNAL (fndecl)
9066 && DECL_DECLARED_INLINE_P (fndecl))
9067 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
9069 /* Genericize before inlining. Delay genericizing nested functions
9070 until their parent function is genericized. Since finalizing
9071 requires GENERIC, delay that as well. */
9073 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
9074 && !undef_nested_function)
9076 if (!decl_function_context (fndecl))
9078 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
9079 c_genericize (fndecl);
9081 /* ??? Objc emits functions after finalizing the compilation unit.
9082 This should be cleaned up later and this conditional removed. */
9083 if (symtab->global_info_ready)
9085 cgraph_node::add_new_function (fndecl, false);
9088 cgraph_node::finalize_function (fndecl, false);
9092 /* Register this function with cgraph just far enough to get it
9093 added to our parent's nested function list. Handy, since the
9094 C front end doesn't have such a list. */
9095 (void) cgraph_node::get_create (fndecl);
9099 if (!decl_function_context (fndecl))
9100 undef_nested_function = false;
9102 if (cfun->language != NULL)
9104 ggc_free (cfun->language);
9105 cfun->language = NULL;
9108 /* We're leaving the context of this function, so zap cfun.
9109 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
9110 tree_rest_of_compilation. */
9112 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION, current_function_decl);
9113 current_function_decl = NULL;
9116 /* Check the declarations given in a for-loop for satisfying the C99
9117 constraints. If exactly one such decl is found, return it. LOC is
9118 the location of the opening parenthesis of the for loop. The last
9119 parameter allows you to control the "for loop initial declarations
9120 are only allowed in C99 mode". Normally, you should pass
9121 flag_isoc99 as that parameter. But in some cases (Objective-C
9122 foreach loop, for example) we want to run the checks in this
9123 function even if not in C99 mode, so we allow the caller to turn
9124 off the error about not being in C99 mode.
9128 check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error)
9130 struct c_binding *b;
9131 tree one_decl = NULL_TREE;
9134 if (!turn_off_iso_c99_error)
9136 static bool hint = true;
9137 /* If we get here, declarations have been used in a for loop without
9138 the C99 for loop scope. This doesn't make much sense, so don't
9140 error_at (loc, "%<for%> loop initial declarations "
9141 "are only allowed in C99 or C11 mode");
9145 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
9146 "to compile your code");
9151 /* C99 subclause 6.8.5 paragraph 3:
9153 [#3] The declaration part of a for statement shall only
9154 declare identifiers for objects having storage class auto or
9157 It isn't clear whether, in this sentence, "identifiers" binds to
9158 "shall only declare" or to "objects" - that is, whether all identifiers
9159 declared must be identifiers for objects, or whether the restriction
9160 only applies to those that are. (A question on this in comp.std.c
9161 in November 2000 received no answer.) We implement the strictest
9162 interpretation, to avoid creating an extension which later causes
9165 for (b = current_scope->bindings; b; b = b->prev)
9168 tree decl = b->decl;
9173 switch (TREE_CODE (decl))
9177 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
9178 if (TREE_STATIC (decl))
9180 "declaration of static variable %qD in %<for%> loop "
9181 "initial declaration", decl);
9182 else if (DECL_EXTERNAL (decl))
9184 "declaration of %<extern%> variable %qD in %<for%> loop "
9185 "initial declaration", decl);
9191 "%<struct %E%> declared in %<for%> loop initial "
9196 "%<union %E%> declared in %<for%> loop initial declaration",
9200 error_at (loc, "%<enum %E%> declared in %<for%> loop "
9201 "initial declaration", id);
9204 error_at (loc, "declaration of non-variable "
9205 "%qD in %<for%> loop initial declaration", decl);
9212 return n_decls == 1 ? one_decl : NULL_TREE;
9215 /* Save and reinitialize the variables
9216 used during compilation of a C function. */
9219 c_push_function_context (void)
9221 struct language_function *p = cfun->language;
9222 /* cfun->language might have been already allocated by the use of
9223 -Wunused-local-typedefs. In that case, just re-use it. */
9225 cfun->language = p = ggc_cleared_alloc<language_function> ();
9227 p->base.x_stmt_tree = c_stmt_tree;
9228 c_stmt_tree.x_cur_stmt_list = vec_safe_copy (c_stmt_tree.x_cur_stmt_list);
9229 p->x_break_label = c_break_label;
9230 p->x_cont_label = c_cont_label;
9231 p->x_switch_stack = c_switch_stack;
9232 p->arg_info = current_function_arg_info;
9233 p->returns_value = current_function_returns_value;
9234 p->returns_null = current_function_returns_null;
9235 p->returns_abnormally = current_function_returns_abnormally;
9236 p->warn_about_return_type = warn_about_return_type;
9238 push_function_context ();
9241 /* Restore the variables used during compilation of a C function. */
9244 c_pop_function_context (void)
9246 struct language_function *p;
9248 pop_function_context ();
9251 /* When -Wunused-local-typedefs is in effect, cfun->languages is
9252 used to store data throughout the life time of the current cfun,
9253 So don't deallocate it. */
9254 if (!warn_unused_local_typedefs)
9255 cfun->language = NULL;
9257 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
9258 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
9260 /* Stop pointing to the local nodes about to be freed. */
9261 /* But DECL_INITIAL must remain nonzero so we know this
9262 was an actual function definition. */
9263 DECL_INITIAL (current_function_decl) = error_mark_node;
9264 DECL_ARGUMENTS (current_function_decl) = 0;
9267 c_stmt_tree = p->base.x_stmt_tree;
9268 p->base.x_stmt_tree.x_cur_stmt_list = NULL;
9269 c_break_label = p->x_break_label;
9270 c_cont_label = p->x_cont_label;
9271 c_switch_stack = p->x_switch_stack;
9272 current_function_arg_info = p->arg_info;
9273 current_function_returns_value = p->returns_value;
9274 current_function_returns_null = p->returns_null;
9275 current_function_returns_abnormally = p->returns_abnormally;
9276 warn_about_return_type = p->warn_about_return_type;
9279 /* The functions below are required for functionality of doing
9280 function at once processing in the C front end. Currently these
9281 functions are not called from anywhere in the C front end, but as
9282 these changes continue, that will change. */
9284 /* Returns the stmt_tree (if any) to which statements are currently
9285 being added. If there is no active statement-tree, NULL is
9289 current_stmt_tree (void)
9291 return &c_stmt_tree;
9294 /* Return the global value of T as a symbol. */
9297 identifier_global_value (tree t)
9299 struct c_binding *b;
9301 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
9302 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
9308 /* In C, the only C-linkage public declaration is at file scope. */
9311 c_linkage_bindings (tree name)
9313 return identifier_global_value (name);
9316 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
9317 otherwise the name is found in ridpointers from RID_INDEX. */
9320 record_builtin_type (enum rid rid_index, const char *name, tree type)
9324 id = ridpointers[(int) rid_index];
9326 id = get_identifier (name);
9327 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
9329 if (debug_hooks->type_decl)
9330 debug_hooks->type_decl (decl, false);
9333 /* Build the void_list_node (void_type_node having been created). */
9335 build_void_list_node (void)
9337 tree t = build_tree_list (NULL_TREE, void_type_node);
9341 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
9344 build_c_parm (struct c_declspecs *specs, tree attrs,
9345 struct c_declarator *declarator)
9347 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
9350 ret->declarator = declarator;
9354 /* Return a declarator with nested attributes. TARGET is the inner
9355 declarator to which these attributes apply. ATTRS are the
9358 struct c_declarator *
9359 build_attrs_declarator (tree attrs, struct c_declarator *target)
9361 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9362 ret->kind = cdk_attrs;
9363 ret->declarator = target;
9364 ret->u.attrs = attrs;
9368 /* Return a declarator for a function with arguments specified by ARGS
9369 and return type specified by TARGET. */
9371 struct c_declarator *
9372 build_function_declarator (struct c_arg_info *args,
9373 struct c_declarator *target)
9375 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9376 ret->kind = cdk_function;
9377 ret->declarator = target;
9378 ret->u.arg_info = args;
9382 /* Return a declarator for the identifier IDENT (which may be
9383 NULL_TREE for an abstract declarator). */
9385 struct c_declarator *
9386 build_id_declarator (tree ident)
9388 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9390 ret->declarator = 0;
9392 /* Default value - may get reset to a more precise location. */
9393 ret->id_loc = input_location;
9397 /* Return something to represent absolute declarators containing a *.
9398 TARGET is the absolute declarator that the * contains.
9399 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
9400 to apply to the pointer type. */
9402 struct c_declarator *
9403 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
9404 struct c_declarator *target)
9408 struct c_declarator *itarget = target;
9409 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9410 if (type_quals_attrs)
9412 attrs = type_quals_attrs->attrs;
9413 quals = quals_from_declspecs (type_quals_attrs);
9414 if (attrs != NULL_TREE)
9415 itarget = build_attrs_declarator (attrs, target);
9417 ret->kind = cdk_pointer;
9418 ret->declarator = itarget;
9419 ret->u.pointer_quals = quals;
9423 /* Return a pointer to a structure for an empty list of declaration
9426 struct c_declspecs *
9427 build_null_declspecs (void)
9429 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
9430 memset (&ret->locations, 0, cdw_number_of_elements);
9435 ret->align_log = -1;
9436 ret->typespec_word = cts_none;
9437 ret->storage_class = csc_none;
9438 ret->expr_const_operands = true;
9439 ret->declspecs_seen_p = false;
9440 ret->typespec_kind = ctsk_none;
9441 ret->non_sc_seen_p = false;
9442 ret->typedef_p = false;
9443 ret->explicit_signed_p = false;
9444 ret->deprecated_p = false;
9445 ret->default_int_p = false;
9446 ret->long_p = false;
9447 ret->long_long_p = false;
9448 ret->short_p = false;
9449 ret->signed_p = false;
9450 ret->unsigned_p = false;
9451 ret->complex_p = false;
9452 ret->inline_p = false;
9453 ret->noreturn_p = false;
9454 ret->thread_p = false;
9455 ret->thread_gnu_p = false;
9456 ret->const_p = false;
9457 ret->volatile_p = false;
9458 ret->atomic_p = false;
9459 ret->restrict_p = false;
9460 ret->saturating_p = false;
9461 ret->alignas_p = false;
9462 ret->address_space = ADDR_SPACE_GENERIC;
9466 /* Add the address space ADDRSPACE to the declaration specifiers
9467 SPECS, returning SPECS. */
9469 struct c_declspecs *
9470 declspecs_add_addrspace (source_location location,
9471 struct c_declspecs *specs, addr_space_t as)
9473 specs->non_sc_seen_p = true;
9474 specs->declspecs_seen_p = true;
9476 if (!ADDR_SPACE_GENERIC_P (specs->address_space)
9477 && specs->address_space != as)
9478 error ("incompatible address space qualifiers %qs and %qs",
9479 c_addr_space_name (as),
9480 c_addr_space_name (specs->address_space));
9483 specs->address_space = as;
9484 specs->locations[cdw_address_space] = location;
9489 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9492 struct c_declspecs *
9493 declspecs_add_qual (source_location loc,
9494 struct c_declspecs *specs, tree qual)
9498 specs->non_sc_seen_p = true;
9499 specs->declspecs_seen_p = true;
9500 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
9501 && C_IS_RESERVED_WORD (qual));
9502 i = C_RID_CODE (qual);
9506 dupe = specs->const_p;
9507 specs->const_p = true;
9508 specs->locations[cdw_const] = loc;
9511 dupe = specs->volatile_p;
9512 specs->volatile_p = true;
9513 specs->locations[cdw_volatile] = loc;
9516 dupe = specs->restrict_p;
9517 specs->restrict_p = true;
9518 specs->locations[cdw_restrict] = loc;
9521 dupe = specs->atomic_p;
9522 specs->atomic_p = true;
9528 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %qE", qual);
9532 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9535 struct c_declspecs *
9536 declspecs_add_type (location_t loc, struct c_declspecs *specs,
9537 struct c_typespec spec)
9539 tree type = spec.spec;
9540 specs->non_sc_seen_p = true;
9541 specs->declspecs_seen_p = true;
9542 specs->typespec_kind = spec.kind;
9543 if (TREE_DEPRECATED (type))
9544 specs->deprecated_p = true;
9546 /* Handle type specifier keywords. */
9547 if (TREE_CODE (type) == IDENTIFIER_NODE
9548 && C_IS_RESERVED_WORD (type)
9549 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
9551 enum rid i = C_RID_CODE (type);
9554 error_at (loc, "two or more data types in declaration specifiers");
9557 if ((int) i <= (int) RID_LAST_MODIFIER)
9559 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9564 if (specs->long_long_p)
9566 error_at (loc, "%<long long long%> is too long for GCC");
9571 if (specs->typespec_word == cts_double)
9574 ("both %<long long%> and %<double%> in "
9575 "declaration specifiers"));
9578 pedwarn_c90 (loc, OPT_Wlong_long,
9579 "ISO C90 does not support %<long long%>");
9580 specs->long_long_p = 1;
9581 specs->locations[cdw_long_long] = loc;
9586 ("both %<long%> and %<short%> in "
9587 "declaration specifiers"));
9588 else if (specs->typespec_word == cts_auto_type)
9590 ("both %<long%> and %<__auto_type%> in "
9591 "declaration specifiers"));
9592 else if (specs->typespec_word == cts_void)
9594 ("both %<long%> and %<void%> in "
9595 "declaration specifiers"));
9596 else if (specs->typespec_word == cts_int_n)
9598 ("both %<long%> and %<__int%d%> in "
9599 "declaration specifiers"),
9600 int_n_data[specs->int_n_idx].bitsize);
9601 else if (specs->typespec_word == cts_bool)
9603 ("both %<long%> and %<_Bool%> in "
9604 "declaration specifiers"));
9605 else if (specs->typespec_word == cts_char)
9607 ("both %<long%> and %<char%> in "
9608 "declaration specifiers"));
9609 else if (specs->typespec_word == cts_float)
9611 ("both %<long%> and %<float%> in "
9612 "declaration specifiers"));
9613 else if (specs->typespec_word == cts_dfloat32)
9615 ("both %<long%> and %<_Decimal32%> in "
9616 "declaration specifiers"));
9617 else if (specs->typespec_word == cts_dfloat64)
9619 ("both %<long%> and %<_Decimal64%> in "
9620 "declaration specifiers"));
9621 else if (specs->typespec_word == cts_dfloat128)
9623 ("both %<long%> and %<_Decimal128%> in "
9624 "declaration specifiers"));
9627 specs->long_p = true;
9628 specs->locations[cdw_long] = loc;
9632 dupe = specs->short_p;
9635 ("both %<long%> and %<short%> in "
9636 "declaration specifiers"));
9637 else if (specs->typespec_word == cts_auto_type)
9639 ("both %<short%> and %<__auto_type%> in "
9640 "declaration specifiers"));
9641 else if (specs->typespec_word == cts_void)
9643 ("both %<short%> and %<void%> in "
9644 "declaration specifiers"));
9645 else if (specs->typespec_word == cts_int_n)
9647 ("both %<short%> and %<__int%d%> in "
9648 "declaration specifiers"),
9649 int_n_data[specs->int_n_idx].bitsize);
9650 else if (specs->typespec_word == cts_bool)
9652 ("both %<short%> and %<_Bool%> in "
9653 "declaration specifiers"));
9654 else if (specs->typespec_word == cts_char)
9656 ("both %<short%> and %<char%> in "
9657 "declaration specifiers"));
9658 else if (specs->typespec_word == cts_float)
9660 ("both %<short%> and %<float%> in "
9661 "declaration specifiers"));
9662 else if (specs->typespec_word == cts_double)
9664 ("both %<short%> and %<double%> in "
9665 "declaration specifiers"));
9666 else if (specs->typespec_word == cts_dfloat32)
9668 ("both %<short%> and %<_Decimal32%> in "
9669 "declaration specifiers"));
9670 else if (specs->typespec_word == cts_dfloat64)
9672 ("both %<short%> and %<_Decimal64%> in "
9673 "declaration specifiers"));
9674 else if (specs->typespec_word == cts_dfloat128)
9676 ("both %<short%> and %<_Decimal128%> in "
9677 "declaration specifiers"));
9680 specs->short_p = true;
9681 specs->locations[cdw_short] = loc;
9685 dupe = specs->signed_p;
9686 if (specs->unsigned_p)
9688 ("both %<signed%> and %<unsigned%> in "
9689 "declaration specifiers"));
9690 else if (specs->typespec_word == cts_auto_type)
9692 ("both %<signed%> and %<__auto_type%> in "
9693 "declaration specifiers"));
9694 else if (specs->typespec_word == cts_void)
9696 ("both %<signed%> and %<void%> in "
9697 "declaration specifiers"));
9698 else if (specs->typespec_word == cts_bool)
9700 ("both %<signed%> and %<_Bool%> in "
9701 "declaration specifiers"));
9702 else if (specs->typespec_word == cts_float)
9704 ("both %<signed%> and %<float%> in "
9705 "declaration specifiers"));
9706 else if (specs->typespec_word == cts_double)
9708 ("both %<signed%> and %<double%> in "
9709 "declaration specifiers"));
9710 else if (specs->typespec_word == cts_dfloat32)
9712 ("both %<signed%> and %<_Decimal32%> in "
9713 "declaration specifiers"));
9714 else if (specs->typespec_word == cts_dfloat64)
9716 ("both %<signed%> and %<_Decimal64%> in "
9717 "declaration specifiers"));
9718 else if (specs->typespec_word == cts_dfloat128)
9720 ("both %<signed%> and %<_Decimal128%> in "
9721 "declaration specifiers"));
9724 specs->signed_p = true;
9725 specs->locations[cdw_signed] = loc;
9729 dupe = specs->unsigned_p;
9730 if (specs->signed_p)
9732 ("both %<signed%> and %<unsigned%> in "
9733 "declaration specifiers"));
9734 else if (specs->typespec_word == cts_auto_type)
9736 ("both %<unsigned%> and %<__auto_type%> in "
9737 "declaration specifiers"));
9738 else if (specs->typespec_word == cts_void)
9740 ("both %<unsigned%> and %<void%> in "
9741 "declaration specifiers"));
9742 else if (specs->typespec_word == cts_bool)
9744 ("both %<unsigned%> and %<_Bool%> in "
9745 "declaration specifiers"));
9746 else if (specs->typespec_word == cts_float)
9748 ("both %<unsigned%> and %<float%> in "
9749 "declaration specifiers"));
9750 else if (specs->typespec_word == cts_double)
9752 ("both %<unsigned%> and %<double%> in "
9753 "declaration specifiers"));
9754 else if (specs->typespec_word == cts_dfloat32)
9756 ("both %<unsigned%> and %<_Decimal32%> in "
9757 "declaration specifiers"));
9758 else if (specs->typespec_word == cts_dfloat64)
9760 ("both %<unsigned%> and %<_Decimal64%> in "
9761 "declaration specifiers"));
9762 else if (specs->typespec_word == cts_dfloat128)
9764 ("both %<unsigned%> and %<_Decimal128%> in "
9765 "declaration specifiers"));
9768 specs->unsigned_p = true;
9769 specs->locations[cdw_unsigned] = loc;
9773 dupe = specs->complex_p;
9774 if (!in_system_header_at (loc))
9775 pedwarn_c90 (loc, OPT_Wpedantic,
9776 "ISO C90 does not support complex types");
9777 if (specs->typespec_word == cts_auto_type)
9779 ("both %<complex%> and %<__auto_type%> in "
9780 "declaration specifiers"));
9781 else if (specs->typespec_word == cts_void)
9783 ("both %<complex%> and %<void%> in "
9784 "declaration specifiers"));
9785 else if (specs->typespec_word == cts_bool)
9787 ("both %<complex%> and %<_Bool%> in "
9788 "declaration specifiers"));
9789 else if (specs->typespec_word == cts_dfloat32)
9791 ("both %<complex%> and %<_Decimal32%> in "
9792 "declaration specifiers"));
9793 else if (specs->typespec_word == cts_dfloat64)
9795 ("both %<complex%> and %<_Decimal64%> in "
9796 "declaration specifiers"));
9797 else if (specs->typespec_word == cts_dfloat128)
9799 ("both %<complex%> and %<_Decimal128%> in "
9800 "declaration specifiers"));
9801 else if (specs->typespec_word == cts_fract)
9803 ("both %<complex%> and %<_Fract%> in "
9804 "declaration specifiers"));
9805 else if (specs->typespec_word == cts_accum)
9807 ("both %<complex%> and %<_Accum%> in "
9808 "declaration specifiers"));
9809 else if (specs->saturating_p)
9811 ("both %<complex%> and %<_Sat%> in "
9812 "declaration specifiers"));
9815 specs->complex_p = true;
9816 specs->locations[cdw_complex] = loc;
9820 dupe = specs->saturating_p;
9821 pedwarn (loc, OPT_Wpedantic,
9822 "ISO C does not support saturating types");
9823 if (specs->typespec_word == cts_int_n)
9826 ("both %<_Sat%> and %<__int%d%> in "
9827 "declaration specifiers"),
9828 int_n_data[specs->int_n_idx].bitsize);
9830 else if (specs->typespec_word == cts_auto_type)
9832 ("both %<_Sat%> and %<__auto_type%> in "
9833 "declaration specifiers"));
9834 else if (specs->typespec_word == cts_void)
9836 ("both %<_Sat%> and %<void%> in "
9837 "declaration specifiers"));
9838 else if (specs->typespec_word == cts_bool)
9840 ("both %<_Sat%> and %<_Bool%> in "
9841 "declaration specifiers"));
9842 else if (specs->typespec_word == cts_char)
9844 ("both %<_Sat%> and %<char%> in "
9845 "declaration specifiers"));
9846 else if (specs->typespec_word == cts_int)
9848 ("both %<_Sat%> and %<int%> in "
9849 "declaration specifiers"));
9850 else if (specs->typespec_word == cts_float)
9852 ("both %<_Sat%> and %<float%> in "
9853 "declaration specifiers"));
9854 else if (specs->typespec_word == cts_double)
9856 ("both %<_Sat%> and %<double%> in "
9857 "declaration specifiers"));
9858 else if (specs->typespec_word == cts_dfloat32)
9860 ("both %<_Sat%> and %<_Decimal32%> in "
9861 "declaration specifiers"));
9862 else if (specs->typespec_word == cts_dfloat64)
9864 ("both %<_Sat%> and %<_Decimal64%> in "
9865 "declaration specifiers"));
9866 else if (specs->typespec_word == cts_dfloat128)
9868 ("both %<_Sat%> and %<_Decimal128%> in "
9869 "declaration specifiers"));
9870 else if (specs->complex_p)
9872 ("both %<_Sat%> and %<complex%> in "
9873 "declaration specifiers"));
9876 specs->saturating_p = true;
9877 specs->locations[cdw_saturating] = loc;
9885 error_at (loc, "duplicate %qE", type);
9891 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9892 "__intN", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9894 if (specs->typespec_word != cts_none)
9897 "two or more data types in declaration specifiers");
9905 ("both %<long%> and %<__auto_type%> in "
9906 "declaration specifiers"));
9907 else if (specs->short_p)
9909 ("both %<short%> and %<__auto_type%> in "
9910 "declaration specifiers"));
9911 else if (specs->signed_p)
9913 ("both %<signed%> and %<__auto_type%> in "
9914 "declaration specifiers"));
9915 else if (specs->unsigned_p)
9917 ("both %<unsigned%> and %<__auto_type%> in "
9918 "declaration specifiers"));
9919 else if (specs->complex_p)
9921 ("both %<complex%> and %<__auto_type%> in "
9922 "declaration specifiers"));
9923 else if (specs->saturating_p)
9925 ("both %<_Sat%> and %<__auto_type%> in "
9926 "declaration specifiers"));
9929 specs->typespec_word = cts_auto_type;
9930 specs->locations[cdw_typespec] = loc;
9937 specs->int_n_idx = i - RID_INT_N_0;
9938 if (!in_system_header_at (input_location))
9939 pedwarn (loc, OPT_Wpedantic,
9940 "ISO C does not support %<__int%d%> types",
9941 int_n_data[specs->int_n_idx].bitsize);
9945 ("both %<__int%d%> and %<long%> in "
9946 "declaration specifiers"),
9947 int_n_data[specs->int_n_idx].bitsize);
9948 else if (specs->saturating_p)
9950 ("both %<_Sat%> and %<__int%d%> in "
9951 "declaration specifiers"),
9952 int_n_data[specs->int_n_idx].bitsize);
9953 else if (specs->short_p)
9955 ("both %<__int%d%> and %<short%> in "
9956 "declaration specifiers"),
9957 int_n_data[specs->int_n_idx].bitsize);
9958 else if (! int_n_enabled_p [specs->int_n_idx])
9960 "%<__int%d%> is not supported on this target",
9961 int_n_data[specs->int_n_idx].bitsize);
9964 specs->typespec_word = cts_int_n;
9965 specs->locations[cdw_typespec] = loc;
9971 ("both %<long%> and %<void%> in "
9972 "declaration specifiers"));
9973 else if (specs->short_p)
9975 ("both %<short%> and %<void%> in "
9976 "declaration specifiers"));
9977 else if (specs->signed_p)
9979 ("both %<signed%> and %<void%> in "
9980 "declaration specifiers"));
9981 else if (specs->unsigned_p)
9983 ("both %<unsigned%> and %<void%> in "
9984 "declaration specifiers"));
9985 else if (specs->complex_p)
9987 ("both %<complex%> and %<void%> in "
9988 "declaration specifiers"));
9989 else if (specs->saturating_p)
9991 ("both %<_Sat%> and %<void%> in "
9992 "declaration specifiers"));
9995 specs->typespec_word = cts_void;
9996 specs->locations[cdw_typespec] = loc;
10000 if (!in_system_header_at (loc))
10001 pedwarn_c90 (loc, OPT_Wpedantic,
10002 "ISO C90 does not support boolean types");
10005 ("both %<long%> and %<_Bool%> in "
10006 "declaration specifiers"));
10007 else if (specs->short_p)
10009 ("both %<short%> and %<_Bool%> in "
10010 "declaration specifiers"));
10011 else if (specs->signed_p)
10013 ("both %<signed%> and %<_Bool%> in "
10014 "declaration specifiers"));
10015 else if (specs->unsigned_p)
10017 ("both %<unsigned%> and %<_Bool%> in "
10018 "declaration specifiers"));
10019 else if (specs->complex_p)
10021 ("both %<complex%> and %<_Bool%> in "
10022 "declaration specifiers"));
10023 else if (specs->saturating_p)
10025 ("both %<_Sat%> and %<_Bool%> in "
10026 "declaration specifiers"));
10029 specs->typespec_word = cts_bool;
10030 specs->locations[cdw_typespec] = loc;
10036 ("both %<long%> and %<char%> in "
10037 "declaration specifiers"));
10038 else if (specs->short_p)
10040 ("both %<short%> and %<char%> in "
10041 "declaration specifiers"));
10042 else if (specs->saturating_p)
10044 ("both %<_Sat%> and %<char%> in "
10045 "declaration specifiers"));
10048 specs->typespec_word = cts_char;
10049 specs->locations[cdw_typespec] = loc;
10053 if (specs->saturating_p)
10055 ("both %<_Sat%> and %<int%> in "
10056 "declaration specifiers"));
10059 specs->typespec_word = cts_int;
10060 specs->locations[cdw_typespec] = loc;
10066 ("both %<long%> and %<float%> in "
10067 "declaration specifiers"));
10068 else if (specs->short_p)
10070 ("both %<short%> and %<float%> in "
10071 "declaration specifiers"));
10072 else if (specs->signed_p)
10074 ("both %<signed%> and %<float%> in "
10075 "declaration specifiers"));
10076 else if (specs->unsigned_p)
10078 ("both %<unsigned%> and %<float%> in "
10079 "declaration specifiers"));
10080 else if (specs->saturating_p)
10082 ("both %<_Sat%> and %<float%> in "
10083 "declaration specifiers"));
10086 specs->typespec_word = cts_float;
10087 specs->locations[cdw_typespec] = loc;
10091 if (specs->long_long_p)
10093 ("both %<long long%> and %<double%> in "
10094 "declaration specifiers"));
10095 else if (specs->short_p)
10097 ("both %<short%> and %<double%> in "
10098 "declaration specifiers"));
10099 else if (specs->signed_p)
10101 ("both %<signed%> and %<double%> in "
10102 "declaration specifiers"));
10103 else if (specs->unsigned_p)
10105 ("both %<unsigned%> and %<double%> in "
10106 "declaration specifiers"));
10107 else if (specs->saturating_p)
10109 ("both %<_Sat%> and %<double%> in "
10110 "declaration specifiers"));
10113 specs->typespec_word = cts_double;
10114 specs->locations[cdw_typespec] = loc;
10119 case RID_DFLOAT128:
10122 if (i == RID_DFLOAT32)
10123 str = "_Decimal32";
10124 else if (i == RID_DFLOAT64)
10125 str = "_Decimal64";
10127 str = "_Decimal128";
10128 if (specs->long_long_p)
10130 ("both %<long long%> and %<%s%> in "
10131 "declaration specifiers"),
10135 ("both %<long%> and %<%s%> in "
10136 "declaration specifiers"),
10138 else if (specs->short_p)
10140 ("both %<short%> and %<%s%> in "
10141 "declaration specifiers"),
10143 else if (specs->signed_p)
10145 ("both %<signed%> and %<%s%> in "
10146 "declaration specifiers"),
10148 else if (specs->unsigned_p)
10150 ("both %<unsigned%> and %<%s%> in "
10151 "declaration specifiers"),
10153 else if (specs->complex_p)
10155 ("both %<complex%> and %<%s%> in "
10156 "declaration specifiers"),
10158 else if (specs->saturating_p)
10160 ("both %<_Sat%> and %<%s%> in "
10161 "declaration specifiers"),
10163 else if (i == RID_DFLOAT32)
10164 specs->typespec_word = cts_dfloat32;
10165 else if (i == RID_DFLOAT64)
10166 specs->typespec_word = cts_dfloat64;
10168 specs->typespec_word = cts_dfloat128;
10169 specs->locations[cdw_typespec] = loc;
10171 if (!targetm.decimal_float_supported_p ())
10173 ("decimal floating point not supported "
10174 "for this target"));
10175 pedwarn (loc, OPT_Wpedantic,
10176 "ISO C does not support decimal floating point");
10182 if (i == RID_FRACT)
10186 if (specs->complex_p)
10188 ("both %<complex%> and %<%s%> in "
10189 "declaration specifiers"),
10191 else if (i == RID_FRACT)
10192 specs->typespec_word = cts_fract;
10194 specs->typespec_word = cts_accum;
10195 specs->locations[cdw_typespec] = loc;
10197 if (!targetm.fixed_point_supported_p ())
10199 "fixed-point types not supported for this target");
10200 pedwarn (loc, OPT_Wpedantic,
10201 "ISO C does not support fixed-point types");
10204 /* ObjC reserved word "id", handled below. */
10210 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
10211 form of ObjC type, cases such as "int" and "long" being handled
10212 above), a TYPE (struct, union, enum and typeof specifiers) or an
10213 ERROR_MARK. In none of these cases may there have previously
10214 been any type specifiers. */
10215 if (specs->type || specs->typespec_word != cts_none
10216 || specs->long_p || specs->short_p || specs->signed_p
10217 || specs->unsigned_p || specs->complex_p)
10218 error_at (loc, "two or more data types in declaration specifiers");
10219 else if (TREE_CODE (type) == TYPE_DECL)
10221 if (TREE_TYPE (type) == error_mark_node)
10222 ; /* Allow the type to default to int to avoid cascading errors. */
10225 specs->type = TREE_TYPE (type);
10226 specs->decl_attr = DECL_ATTRIBUTES (type);
10227 specs->typedef_p = true;
10228 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
10229 specs->locations[cdw_typedef] = loc;
10231 /* If this typedef name is defined in a struct, then a C++
10232 lookup would return a different value. */
10233 if (warn_cxx_compat
10234 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
10235 warning_at (loc, OPT_Wc___compat,
10236 "C++ lookup of %qD would return a field, not a type",
10239 /* If we are parsing a struct, record that a struct field
10241 if (warn_cxx_compat && struct_parse_info != NULL)
10242 struct_parse_info->typedefs_seen.safe_push (type);
10245 else if (TREE_CODE (type) == IDENTIFIER_NODE)
10247 tree t = lookup_name (type);
10248 if (!t || TREE_CODE (t) != TYPE_DECL)
10249 error_at (loc, "%qE fails to be a typedef or built in type", type);
10250 else if (TREE_TYPE (t) == error_mark_node)
10254 specs->type = TREE_TYPE (t);
10255 specs->locations[cdw_typespec] = loc;
10260 if (TREE_CODE (type) != ERROR_MARK && spec.kind == ctsk_typeof)
10262 specs->typedef_p = true;
10263 specs->locations[cdw_typedef] = loc;
10267 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
10268 specs->expr, spec.expr);
10270 specs->expr = spec.expr;
10271 specs->expr_const_operands &= spec.expr_const_operands;
10274 specs->type = type;
10280 /* Add the storage class specifier or function specifier SCSPEC to the
10281 declaration specifiers SPECS, returning SPECS. */
10283 struct c_declspecs *
10284 declspecs_add_scspec (source_location loc,
10285 struct c_declspecs *specs,
10289 enum c_storage_class n = csc_none;
10291 specs->declspecs_seen_p = true;
10292 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
10293 && C_IS_RESERVED_WORD (scspec));
10294 i = C_RID_CODE (scspec);
10295 if (specs->non_sc_seen_p)
10296 warning (OPT_Wold_style_declaration,
10297 "%qE is not at beginning of declaration", scspec);
10301 /* C99 permits duplicate inline. Although of doubtful utility,
10302 it seems simplest to permit it in gnu89 mode as well, as
10303 there is also little utility in maintaining this as a
10304 difference between gnu89 and C99 inline. */
10306 specs->inline_p = true;
10307 specs->locations[cdw_inline] = loc;
10310 /* Duplicate _Noreturn is permitted. */
10312 specs->noreturn_p = true;
10313 specs->locations[cdw_noreturn] = loc;
10316 dupe = specs->thread_p;
10317 if (specs->storage_class == csc_auto)
10318 error ("%qE used with %<auto%>", scspec);
10319 else if (specs->storage_class == csc_register)
10320 error ("%qE used with %<register%>", scspec);
10321 else if (specs->storage_class == csc_typedef)
10322 error ("%qE used with %<typedef%>", scspec);
10325 specs->thread_p = true;
10326 specs->thread_gnu_p = (strcmp (IDENTIFIER_POINTER (scspec),
10328 /* A diagnostic is not required for the use of this
10329 identifier in the implementation namespace; only diagnose
10330 it for the C11 spelling because of existing code using
10331 the other spelling. */
10332 if (!specs->thread_gnu_p)
10335 pedwarn_c99 (loc, OPT_Wpedantic,
10336 "ISO C99 does not support %qE", scspec);
10338 pedwarn_c99 (loc, OPT_Wpedantic,
10339 "ISO C90 does not support %qE", scspec);
10341 specs->locations[cdw_thread] = loc;
10349 /* Diagnose "__thread extern". */
10350 if (specs->thread_p && specs->thread_gnu_p)
10351 error ("%<__thread%> before %<extern%>");
10358 /* Diagnose "__thread static". */
10359 if (specs->thread_p && specs->thread_gnu_p)
10360 error ("%<__thread%> before %<static%>");
10366 gcc_unreachable ();
10368 if (n != csc_none && n == specs->storage_class)
10372 if (i == RID_THREAD)
10373 error ("duplicate %<_Thread_local%> or %<__thread%>");
10375 error ("duplicate %qE", scspec);
10379 if (specs->storage_class != csc_none && n != specs->storage_class)
10381 error ("multiple storage classes in declaration specifiers");
10385 specs->storage_class = n;
10386 specs->locations[cdw_storage_class] = loc;
10387 if (n != csc_extern && n != csc_static && specs->thread_p)
10389 error ("%qs used with %qE",
10390 specs->thread_gnu_p ? "__thread" : "_Thread_local",
10392 specs->thread_p = false;
10399 /* Add the attributes ATTRS to the declaration specifiers SPECS,
10400 returning SPECS. */
10402 struct c_declspecs *
10403 declspecs_add_attrs (source_location loc, struct c_declspecs *specs, tree attrs)
10405 specs->attrs = chainon (attrs, specs->attrs);
10406 specs->locations[cdw_attributes] = loc;
10407 specs->declspecs_seen_p = true;
10411 /* Add an _Alignas specifier (expression ALIGN, or type whose
10412 alignment is ALIGN) to the declaration specifiers SPECS, returning
10414 struct c_declspecs *
10415 declspecs_add_alignas (source_location loc,
10416 struct c_declspecs *specs, tree align)
10419 specs->alignas_p = true;
10420 specs->locations[cdw_alignas] = loc;
10421 if (align == error_mark_node)
10423 align_log = check_user_alignment (align, true);
10424 if (align_log > specs->align_log)
10425 specs->align_log = align_log;
10429 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10430 specifiers with any other type specifier to determine the resulting
10431 type. This is where ISO C checks on complex types are made, since
10432 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10435 struct c_declspecs *
10436 finish_declspecs (struct c_declspecs *specs)
10438 /* If a type was specified as a whole, we have no modifiers and are
10440 if (specs->type != NULL_TREE)
10442 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
10443 && !specs->signed_p && !specs->unsigned_p
10444 && !specs->complex_p);
10446 /* Set a dummy type. */
10447 if (TREE_CODE (specs->type) == ERROR_MARK)
10448 specs->type = integer_type_node;
10452 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10453 has been specified, treat it as "int" unless "_Complex" is
10454 present and there are no other specifiers. If we just have
10455 "_Complex", it is equivalent to "_Complex double", but e.g.
10456 "_Complex short" is equivalent to "_Complex short int". */
10457 if (specs->typespec_word == cts_none)
10459 if (specs->saturating_p)
10461 error_at (specs->locations[cdw_saturating],
10462 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10463 if (!targetm.fixed_point_supported_p ())
10464 error_at (specs->locations[cdw_saturating],
10465 "fixed-point types not supported for this target");
10466 specs->typespec_word = cts_fract;
10468 else if (specs->long_p || specs->short_p
10469 || specs->signed_p || specs->unsigned_p)
10471 specs->typespec_word = cts_int;
10473 else if (specs->complex_p)
10475 specs->typespec_word = cts_double;
10476 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10477 "ISO C does not support plain %<complex%> meaning "
10478 "%<double complex%>");
10482 specs->typespec_word = cts_int;
10483 specs->default_int_p = true;
10484 /* We don't diagnose this here because grokdeclarator will
10485 give more specific diagnostics according to whether it is
10486 a function definition. */
10490 /* If "signed" was specified, record this to distinguish "int" and
10491 "signed int" in the case of a bit-field with
10492 -funsigned-bitfields. */
10493 specs->explicit_signed_p = specs->signed_p;
10495 /* Now compute the actual type. */
10496 switch (specs->typespec_word)
10498 case cts_auto_type:
10499 gcc_assert (!specs->long_p && !specs->short_p
10500 && !specs->signed_p && !specs->unsigned_p
10501 && !specs->complex_p);
10502 /* Type to be filled in later. */
10505 gcc_assert (!specs->long_p && !specs->short_p
10506 && !specs->signed_p && !specs->unsigned_p
10507 && !specs->complex_p);
10508 specs->type = void_type_node;
10511 gcc_assert (!specs->long_p && !specs->short_p
10512 && !specs->signed_p && !specs->unsigned_p
10513 && !specs->complex_p);
10514 specs->type = boolean_type_node;
10517 gcc_assert (!specs->long_p && !specs->short_p);
10518 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10519 if (specs->signed_p)
10520 specs->type = signed_char_type_node;
10521 else if (specs->unsigned_p)
10522 specs->type = unsigned_char_type_node;
10524 specs->type = char_type_node;
10525 if (specs->complex_p)
10527 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10528 "ISO C does not support complex integer types");
10529 specs->type = build_complex_type (specs->type);
10533 gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p);
10534 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10535 specs->type = (specs->unsigned_p
10536 ? int_n_trees[specs->int_n_idx].unsigned_type
10537 : int_n_trees[specs->int_n_idx].signed_type);
10538 if (specs->complex_p)
10540 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10541 "ISO C does not support complex integer types");
10542 specs->type = build_complex_type (specs->type);
10546 gcc_assert (!(specs->long_p && specs->short_p));
10547 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10548 if (specs->long_long_p)
10549 specs->type = (specs->unsigned_p
10550 ? long_long_unsigned_type_node
10551 : long_long_integer_type_node);
10552 else if (specs->long_p)
10553 specs->type = (specs->unsigned_p
10554 ? long_unsigned_type_node
10555 : long_integer_type_node);
10556 else if (specs->short_p)
10557 specs->type = (specs->unsigned_p
10558 ? short_unsigned_type_node
10559 : short_integer_type_node);
10561 specs->type = (specs->unsigned_p
10562 ? unsigned_type_node
10563 : integer_type_node);
10564 if (specs->complex_p)
10566 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10567 "ISO C does not support complex integer types");
10568 specs->type = build_complex_type (specs->type);
10572 gcc_assert (!specs->long_p && !specs->short_p
10573 && !specs->signed_p && !specs->unsigned_p);
10574 specs->type = (specs->complex_p
10575 ? complex_float_type_node
10576 : float_type_node);
10579 gcc_assert (!specs->long_long_p && !specs->short_p
10580 && !specs->signed_p && !specs->unsigned_p);
10583 specs->type = (specs->complex_p
10584 ? complex_long_double_type_node
10585 : long_double_type_node);
10589 specs->type = (specs->complex_p
10590 ? complex_double_type_node
10591 : double_type_node);
10596 case cts_dfloat128:
10597 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
10598 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
10599 if (specs->typespec_word == cts_dfloat32)
10600 specs->type = dfloat32_type_node;
10601 else if (specs->typespec_word == cts_dfloat64)
10602 specs->type = dfloat64_type_node;
10604 specs->type = dfloat128_type_node;
10607 gcc_assert (!specs->complex_p);
10608 if (!targetm.fixed_point_supported_p ())
10609 specs->type = integer_type_node;
10610 else if (specs->saturating_p)
10612 if (specs->long_long_p)
10613 specs->type = specs->unsigned_p
10614 ? sat_unsigned_long_long_fract_type_node
10615 : sat_long_long_fract_type_node;
10616 else if (specs->long_p)
10617 specs->type = specs->unsigned_p
10618 ? sat_unsigned_long_fract_type_node
10619 : sat_long_fract_type_node;
10620 else if (specs->short_p)
10621 specs->type = specs->unsigned_p
10622 ? sat_unsigned_short_fract_type_node
10623 : sat_short_fract_type_node;
10625 specs->type = specs->unsigned_p
10626 ? sat_unsigned_fract_type_node
10627 : sat_fract_type_node;
10631 if (specs->long_long_p)
10632 specs->type = specs->unsigned_p
10633 ? unsigned_long_long_fract_type_node
10634 : long_long_fract_type_node;
10635 else if (specs->long_p)
10636 specs->type = specs->unsigned_p
10637 ? unsigned_long_fract_type_node
10638 : long_fract_type_node;
10639 else if (specs->short_p)
10640 specs->type = specs->unsigned_p
10641 ? unsigned_short_fract_type_node
10642 : short_fract_type_node;
10644 specs->type = specs->unsigned_p
10645 ? unsigned_fract_type_node
10650 gcc_assert (!specs->complex_p);
10651 if (!targetm.fixed_point_supported_p ())
10652 specs->type = integer_type_node;
10653 else if (specs->saturating_p)
10655 if (specs->long_long_p)
10656 specs->type = specs->unsigned_p
10657 ? sat_unsigned_long_long_accum_type_node
10658 : sat_long_long_accum_type_node;
10659 else if (specs->long_p)
10660 specs->type = specs->unsigned_p
10661 ? sat_unsigned_long_accum_type_node
10662 : sat_long_accum_type_node;
10663 else if (specs->short_p)
10664 specs->type = specs->unsigned_p
10665 ? sat_unsigned_short_accum_type_node
10666 : sat_short_accum_type_node;
10668 specs->type = specs->unsigned_p
10669 ? sat_unsigned_accum_type_node
10670 : sat_accum_type_node;
10674 if (specs->long_long_p)
10675 specs->type = specs->unsigned_p
10676 ? unsigned_long_long_accum_type_node
10677 : long_long_accum_type_node;
10678 else if (specs->long_p)
10679 specs->type = specs->unsigned_p
10680 ? unsigned_long_accum_type_node
10681 : long_accum_type_node;
10682 else if (specs->short_p)
10683 specs->type = specs->unsigned_p
10684 ? unsigned_short_accum_type_node
10685 : short_accum_type_node;
10687 specs->type = specs->unsigned_p
10688 ? unsigned_accum_type_node
10693 gcc_unreachable ();
10699 /* Perform final processing on one file scope's declarations (or the
10700 external scope's declarations), GLOBALS. */
10703 c_write_global_declarations_1 (tree globals)
10708 /* Process the decls in the order they were written. */
10709 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10711 /* Check for used but undefined static functions using the C
10712 standard's definition of "used", and set TREE_NO_WARNING so
10713 that check_global_declaration doesn't repeat the check. */
10714 if (TREE_CODE (decl) == FUNCTION_DECL
10715 && DECL_INITIAL (decl) == 0
10716 && DECL_EXTERNAL (decl)
10717 && !TREE_PUBLIC (decl)
10718 && C_DECL_USED (decl))
10720 pedwarn (input_location, 0, "%q+F used but never defined", decl);
10721 TREE_NO_WARNING (decl) = 1;
10724 wrapup_global_declaration_1 (decl);
10729 reconsider = false;
10730 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10731 reconsider |= wrapup_global_declaration_2 (decl);
10733 while (reconsider);
10736 /* Callback to collect a source_ref from a DECL. */
10739 collect_source_ref_cb (tree decl)
10741 if (!DECL_IS_BUILTIN (decl))
10742 collect_source_ref (LOCATION_FILE (decl_sloc (decl, false)));
10745 /* Preserve the external declarations scope across a garbage collect. */
10746 static GTY(()) tree ext_block;
10748 /* Collect all references relevant to SOURCE_FILE. */
10751 collect_all_refs (const char *source_file)
10756 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10757 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file);
10759 collect_ada_nodes (BLOCK_VARS (ext_block), source_file);
10762 /* Iterate over all global declarations and call CALLBACK. */
10765 for_each_global_decl (void (*callback) (tree decl))
10772 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10774 decls = DECL_INITIAL (t);
10775 for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl))
10779 for (decl = BLOCK_VARS (ext_block); decl; decl = TREE_CHAIN (decl))
10783 /* Perform any final parser cleanups and generate initial debugging
10787 c_parse_final_cleanups (void)
10792 /* We don't want to do this if generating a PCH. */
10796 timevar_stop (TV_PHASE_PARSING);
10797 timevar_start (TV_PHASE_DEFERRED);
10799 /* Do the Objective-C stuff. This is where all the Objective-C
10800 module stuff gets generated (symtab, class/protocol/selector
10802 if (c_dialect_objc ())
10803 objc_write_global_declarations ();
10805 /* Close the external scope. */
10806 ext_block = pop_scope ();
10807 external_scope = 0;
10808 gcc_assert (!current_scope);
10810 /* Handle -fdump-ada-spec[-slim]. */
10811 if (flag_dump_ada_spec || flag_dump_ada_spec_slim)
10813 /* Build a table of files to generate specs for */
10814 if (flag_dump_ada_spec_slim)
10815 collect_source_ref (main_input_filename);
10817 for_each_global_decl (collect_source_ref_cb);
10819 dump_ada_specs (collect_all_refs, NULL);
10824 tree tmp = BLOCK_VARS (ext_block);
10826 FILE * stream = dump_begin (TDI_tu, &flags);
10829 dump_node (tmp, flags & ~TDF_SLIM, stream);
10830 dump_end (TDI_tu, stream);
10834 /* Process all file scopes in this compilation, and the external_scope,
10835 through wrapup_global_declarations. */
10836 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10837 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
10838 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
10840 timevar_stop (TV_PHASE_DEFERRED);
10841 timevar_start (TV_PHASE_PARSING);
10846 /* Register reserved keyword WORD as qualifier for address space AS. */
10849 c_register_addr_space (const char *word, addr_space_t as)
10851 int rid = RID_FIRST_ADDR_SPACE + as;
10854 /* Address space qualifiers are only supported
10855 in C with GNU extensions enabled. */
10856 if (c_dialect_objc () || flag_no_asm)
10859 id = get_identifier (word);
10860 C_SET_RID_CODE (id, rid);
10861 C_IS_RESERVED_WORD (id) = 1;
10862 ridpointers [rid] = id;
10865 /* Return identifier to look up for omp declare reduction. */
10868 c_omp_reduction_id (enum tree_code reduction_code, tree reduction_id)
10870 const char *p = NULL;
10871 switch (reduction_code)
10873 case PLUS_EXPR: p = "+"; break;
10874 case MULT_EXPR: p = "*"; break;
10875 case MINUS_EXPR: p = "-"; break;
10876 case BIT_AND_EXPR: p = "&"; break;
10877 case BIT_XOR_EXPR: p = "^"; break;
10878 case BIT_IOR_EXPR: p = "|"; break;
10879 case TRUTH_ANDIF_EXPR: p = "&&"; break;
10880 case TRUTH_ORIF_EXPR: p = "||"; break;
10881 case MIN_EXPR: p = "min"; break;
10882 case MAX_EXPR: p = "max"; break;
10889 if (TREE_CODE (reduction_id) != IDENTIFIER_NODE)
10890 return error_mark_node;
10891 p = IDENTIFIER_POINTER (reduction_id);
10894 const char prefix[] = "omp declare reduction ";
10895 size_t lenp = sizeof (prefix);
10896 size_t len = strlen (p);
10897 char *name = XALLOCAVEC (char, lenp + len);
10898 memcpy (name, prefix, lenp - 1);
10899 memcpy (name + lenp - 1, p, len + 1);
10900 return get_identifier (name);
10903 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10904 VAR_DECL, bind it into the current scope and return it. */
10907 c_omp_reduction_decl (tree reduction_id)
10909 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
10910 if (b != NULL && B_IN_CURRENT_SCOPE (b))
10913 tree decl = build_decl (BUILTINS_LOCATION, VAR_DECL,
10914 reduction_id, integer_type_node);
10915 DECL_ARTIFICIAL (decl) = 1;
10916 DECL_EXTERNAL (decl) = 1;
10917 TREE_STATIC (decl) = 1;
10918 TREE_PUBLIC (decl) = 0;
10919 bind (reduction_id, decl, current_scope, true, false, BUILTINS_LOCATION);
10923 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10926 c_omp_reduction_lookup (tree reduction_id, tree type)
10928 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
10932 for (t = DECL_INITIAL (b->decl); t; t = TREE_CHAIN (t))
10933 if (comptypes (TREE_PURPOSE (t), type))
10934 return TREE_VALUE (t);
10937 return error_mark_node;
10940 /* Helper function called via walk_tree, to diagnose invalid
10941 #pragma omp declare reduction combiners or initializers. */
10944 c_check_omp_declare_reduction_r (tree *tp, int *, void *data)
10946 tree *vars = (tree *) data;
10947 if (SSA_VAR_P (*tp)
10948 && !DECL_ARTIFICIAL (*tp)
10952 location_t loc = DECL_SOURCE_LOCATION (vars[0]);
10953 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars[0])), "omp_out") == 0)
10954 error_at (loc, "%<#pragma omp declare reduction%> combiner refers to "
10955 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10958 error_at (loc, "%<#pragma omp declare reduction%> initializer refers "
10959 "to variable %qD which is not %<omp_priv%> nor "
10967 #include "gt-c-c-decl.h"