1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Process declarations and symbol lookup for C front end.
21 Also constructs types; the standard scalar types at initialization,
22 and structure, union, array and enum types when they are declared. */
24 /* ??? not all decl nodes are given the most useful possible
25 line numbers. For example, the CONST_DECLs for enum values. */
29 #include "coretypes.h"
38 #include "double-int.h"
42 #include "fold-const.h"
43 #include "print-tree.h"
44 #include "stor-layout.h"
47 #include "stringpool.h"
48 #include "tree-inline.h"
54 #include "hard-reg-set.h"
64 #include "c-family/c-common.h"
65 #include "c-family/c-objc.h"
66 #include "c-family/c-pragma.h"
67 #include "c-family/c-ubsan.h"
69 #include "langhooks.h"
70 #include "tree-iterator.h"
71 #include "diagnostic-core.h"
75 #include "plugin-api.h"
78 #include "hash-table.h"
79 #include "langhooks-def.h"
81 #include "c-family/c-ada-spec.h"
85 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
87 { NORMAL, /* Ordinary declaration */
88 FUNCDEF, /* Function definition */
89 PARM, /* Declaration of parm before function body */
90 FIELD, /* Declaration inside struct or union */
91 TYPENAME}; /* Typename (inside cast or sizeof) */
93 /* States indicating how grokdeclarator() should handle declspecs marked
94 with __attribute__((deprecated)). An object declared as
95 __attribute__((deprecated)) suppresses warnings of uses of other
98 enum deprecated_states {
104 /* Nonzero if we have seen an invalid cross reference
105 to a struct, union, or enum, but not yet printed the message. */
106 tree pending_invalid_xref;
108 /* File and line to appear in the eventual error message. */
109 location_t pending_invalid_xref_location;
111 /* The file and line that the prototype came from if this is an
112 old-style definition; used for diagnostics in
113 store_parm_decls_oldstyle. */
115 static location_t current_function_prototype_locus;
117 /* Whether this prototype was built-in. */
119 static bool current_function_prototype_built_in;
121 /* The argument type information of this prototype. */
123 static tree current_function_prototype_arg_types;
125 /* The argument information structure for the function currently being
128 static struct c_arg_info *current_function_arg_info;
130 /* The obstack on which parser and related data structures, which are
131 not live beyond their top-level declaration or definition, are
133 struct obstack parser_obstack;
135 /* The current statement tree. */
137 static GTY(()) struct stmt_tree_s c_stmt_tree;
139 /* State saving variables. */
143 /* A list of decls to be made automatically visible in each file scope. */
144 static GTY(()) tree visible_builtins;
146 /* Set to 0 at beginning of a function definition, set to 1 if
147 a return statement that specifies a return value is seen. */
149 int current_function_returns_value;
151 /* Set to 0 at beginning of a function definition, set to 1 if
152 a return statement with no argument is seen. */
154 int current_function_returns_null;
156 /* Set to 0 at beginning of a function definition, set to 1 if
157 a call to a noreturn function is seen. */
159 int current_function_returns_abnormally;
161 /* Set to nonzero by `grokdeclarator' for a function
162 whose return type is defaulted, if warnings for this are desired. */
164 static int warn_about_return_type;
166 /* Nonzero when the current toplevel function contains a declaration
167 of a nested function which is never defined. */
169 static bool undef_nested_function;
171 /* If non-zero, implicit "omp declare target" attribute is added into the
173 int current_omp_declare_target_attribute;
175 /* Each c_binding structure describes one binding of an identifier to
176 a decl. All the decls in a scope - irrespective of namespace - are
177 chained together by the ->prev field, which (as the name implies)
178 runs in reverse order. All the decls in a given namespace bound to
179 a given identifier are chained by the ->shadowed field, which runs
180 from inner to outer scopes.
182 The ->decl field usually points to a DECL node, but there are two
183 exceptions. In the namespace of type tags, the bound entity is a
184 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
185 identifier is encountered, it is bound to error_mark_node to
186 suppress further errors about that identifier in the current
189 The ->u.type field stores the type of the declaration in this scope;
190 if NULL, the type is the type of the ->decl field. This is only of
191 relevance for objects with external or internal linkage which may
192 be redeclared in inner scopes, forming composite types that only
193 persist for the duration of those scopes. In the external scope,
194 this stores the composite of all the types declared for this
195 object, visible or not. The ->inner_comp field (used only at file
196 scope) stores whether an incomplete array type at file scope was
197 completed at an inner scope to an array size other than 1.
199 The ->u.label field is used for labels. It points to a structure
200 which stores additional information used for warnings.
202 The depth field is copied from the scope structure that holds this
203 decl. It is used to preserve the proper ordering of the ->shadowed
204 field (see bind()) and also for a handful of special-case checks.
205 Finally, the invisible bit is true for a decl which should be
206 ignored for purposes of normal name lookup, and the nested bit is
207 true for a decl that's been bound a second time in an inner scope;
208 in all such cases, the binding in the outer scope will have its
209 invisible bit true. */
211 struct GTY((chain_next ("%h.prev"))) c_binding {
212 union GTY(()) { /* first so GTY desc can use decl */
213 tree GTY((tag ("0"))) type; /* the type in this scope */
214 struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */
215 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u;
216 tree decl; /* the decl bound */
217 tree id; /* the identifier it's bound to */
218 struct c_binding *prev; /* the previous decl in this scope */
219 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
220 unsigned int depth : 28; /* depth of this scope */
221 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
222 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
223 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
224 BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */
225 location_t locus; /* location for nested bindings */
227 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
228 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
229 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
230 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
232 /* Each C symbol points to three linked lists of c_binding structures.
233 These describe the values of the identifier in the three different
234 namespaces defined by the language. */
236 struct GTY(()) lang_identifier {
237 struct c_common_identifier common_id;
238 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
239 struct c_binding *tag_binding; /* struct/union/enum tags */
240 struct c_binding *label_binding; /* labels */
243 /* Validate c-lang.c's assumptions. */
244 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
245 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
247 /* The binding oracle; see c-tree.h. */
248 void (*c_binding_oracle) (enum c_oracle_request, tree identifier);
250 /* This flag is set on an identifier if we have previously asked the
251 binding oracle for this identifier's symbol binding. */
252 #define I_SYMBOL_CHECKED(node) \
253 (TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (node)))
255 static inline struct c_binding* *
256 i_symbol_binding (tree node)
258 struct lang_identifier *lid
259 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
261 if (lid->symbol_binding == NULL
262 && c_binding_oracle != NULL
263 && !I_SYMBOL_CHECKED (node))
265 /* Set the "checked" flag first, to avoid infinite recursion
266 when the binding oracle calls back into gcc. */
267 I_SYMBOL_CHECKED (node) = 1;
268 c_binding_oracle (C_ORACLE_SYMBOL, node);
271 return &lid->symbol_binding;
274 #define I_SYMBOL_BINDING(node) (*i_symbol_binding (node))
276 #define I_SYMBOL_DECL(node) \
277 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
279 /* This flag is set on an identifier if we have previously asked the
280 binding oracle for this identifier's tag binding. */
281 #define I_TAG_CHECKED(node) \
282 (TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (node)))
284 static inline struct c_binding **
285 i_tag_binding (tree node)
287 struct lang_identifier *lid
288 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
290 if (lid->tag_binding == NULL
291 && c_binding_oracle != NULL
292 && !I_TAG_CHECKED (node))
294 /* Set the "checked" flag first, to avoid infinite recursion
295 when the binding oracle calls back into gcc. */
296 I_TAG_CHECKED (node) = 1;
297 c_binding_oracle (C_ORACLE_TAG, node);
300 return &lid->tag_binding;
303 #define I_TAG_BINDING(node) (*i_tag_binding (node))
305 #define I_TAG_DECL(node) \
306 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
308 /* This flag is set on an identifier if we have previously asked the
309 binding oracle for this identifier's label binding. */
310 #define I_LABEL_CHECKED(node) \
311 (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (node)))
313 static inline struct c_binding **
314 i_label_binding (tree node)
316 struct lang_identifier *lid
317 = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node);
319 if (lid->label_binding == NULL
320 && c_binding_oracle != NULL
321 && !I_LABEL_CHECKED (node))
323 /* Set the "checked" flag first, to avoid infinite recursion
324 when the binding oracle calls back into gcc. */
325 I_LABEL_CHECKED (node) = 1;
326 c_binding_oracle (C_ORACLE_LABEL, node);
329 return &lid->label_binding;
332 #define I_LABEL_BINDING(node) (*i_label_binding (node))
334 #define I_LABEL_DECL(node) \
335 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
337 /* The resulting tree type. */
339 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
340 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
342 union tree_node GTY ((tag ("0"),
343 desc ("tree_node_structure (&%h)")))
345 struct lang_identifier GTY ((tag ("1"))) identifier;
348 /* Track bindings and other things that matter for goto warnings. For
349 efficiency, we do not gather all the decls at the point of
350 definition. Instead, we point into the bindings structure. As
351 scopes are popped, we update these structures and gather the decls
352 that matter at that time. */
354 struct GTY(()) c_spot_bindings {
355 /* The currently open scope which holds bindings defined when the
356 label was defined or the goto statement was found. */
357 struct c_scope *scope;
358 /* The bindings in the scope field which were defined at the point
359 of the label or goto. This lets us look at older or newer
360 bindings in the scope, as appropriate. */
361 struct c_binding *bindings_in_scope;
362 /* The number of statement expressions that have started since this
363 label or goto statement was defined. This is zero if we are at
364 the same statement expression level. It is positive if we are in
365 a statement expression started since this spot. It is negative
366 if this spot was in a statement expression and we have left
369 /* Whether we started in a statement expression but are no longer in
370 it. This is set to true if stmt_exprs ever goes negative. */
374 /* This structure is used to keep track of bindings seen when a goto
375 statement is defined. This is only used if we see the goto
376 statement before we see the label. */
378 struct GTY(()) c_goto_bindings {
379 /* The location of the goto statement. */
381 /* The bindings of the goto statement. */
382 struct c_spot_bindings goto_bindings;
385 typedef struct c_goto_bindings *c_goto_bindings_p;
387 /* The additional information we keep track of for a label binding.
388 These fields are updated as scopes are popped. */
390 struct GTY(()) c_label_vars {
391 /* The shadowed c_label_vars, when one label shadows another (which
392 can only happen using a __label__ declaration). */
393 struct c_label_vars *shadowed;
394 /* The bindings when the label was defined. */
395 struct c_spot_bindings label_bindings;
396 /* A list of decls that we care about: decls about which we should
397 warn if a goto branches to this label from later in the function.
398 Decls are added to this list as scopes are popped. We only add
399 the decls that matter. */
400 vec<tree, va_gc> *decls_in_scope;
401 /* A list of goto statements to this label. This is only used for
402 goto statements seen before the label was defined, so that we can
403 issue appropriate warnings for them. */
404 vec<c_goto_bindings_p, va_gc> *gotos;
407 /* Each c_scope structure describes the complete contents of one
408 scope. Four scopes are distinguished specially: the innermost or
409 current scope, the innermost function scope, the file scope (always
410 the second to outermost) and the outermost or external scope.
412 Most declarations are recorded in the current scope.
414 All normal label declarations are recorded in the innermost
415 function scope, as are bindings of undeclared identifiers to
416 error_mark_node. (GCC permits nested functions as an extension,
417 hence the 'innermost' qualifier.) Explicitly declared labels
418 (using the __label__ extension) appear in the current scope.
420 Being in the file scope (current_scope == file_scope) causes
421 special behavior in several places below. Also, under some
422 conditions the Objective-C front end records declarations in the
423 file scope even though that isn't the current scope.
425 All declarations with external linkage are recorded in the external
426 scope, even if they aren't visible there; this models the fact that
427 such declarations are visible to the entire program, and (with a
428 bit of cleverness, see pushdecl) allows diagnosis of some violations
429 of C99 6.2.2p7 and 6.2.7p2:
431 If, within the same translation unit, the same identifier appears
432 with both internal and external linkage, the behavior is
435 All declarations that refer to the same object or function shall
436 have compatible type; otherwise, the behavior is undefined.
438 Initially only the built-in declarations, which describe compiler
439 intrinsic functions plus a subset of the standard library, are in
442 The order of the blocks list matters, and it is frequently appended
443 to. To avoid having to walk all the way to the end of the list on
444 each insertion, or reverse the list later, we maintain a pointer to
445 the last list entry. (FIXME: It should be feasible to use a reversed
448 The bindings list is strictly in reverse order of declarations;
449 pop_scope relies on this. */
452 struct GTY((chain_next ("%h.outer"))) c_scope {
453 /* The scope containing this one. */
454 struct c_scope *outer;
456 /* The next outermost function scope. */
457 struct c_scope *outer_function;
459 /* All bindings in this scope. */
460 struct c_binding *bindings;
462 /* For each scope (except the global one), a chain of BLOCK nodes
463 for all the scopes that were entered and exited one level down. */
467 /* The depth of this scope. Used to keep the ->shadowed chain of
468 bindings sorted innermost to outermost. */
469 unsigned int depth : 28;
471 /* True if we are currently filling this scope with parameter
473 BOOL_BITFIELD parm_flag : 1;
475 /* True if we saw [*] in this scope. Used to give an error messages
476 if these appears in a function definition. */
477 BOOL_BITFIELD had_vla_unspec : 1;
479 /* True if we already complained about forward parameter decls
480 in this scope. This prevents double warnings on
481 foo (int a; int b; ...) */
482 BOOL_BITFIELD warned_forward_parm_decls : 1;
484 /* True if this is the outermost block scope of a function body.
485 This scope contains the parameters, the local variables declared
486 in the outermost block, and all the labels (except those in
487 nested functions, or declared at block scope with __label__). */
488 BOOL_BITFIELD function_body : 1;
490 /* True means make a BLOCK for this scope no matter what. */
491 BOOL_BITFIELD keep : 1;
493 /* True means that an unsuffixed float constant is _Decimal64. */
494 BOOL_BITFIELD float_const_decimal64 : 1;
496 /* True if this scope has any label bindings. This is used to speed
497 up searching for labels when popping scopes, particularly since
498 labels are normally only found at function scope. */
499 BOOL_BITFIELD has_label_bindings : 1;
501 /* True if we should issue a warning if a goto statement crosses any
502 of the bindings. We still need to check the list of bindings to
503 find the specific ones we need to warn about. This is true if
504 decl_jump_unsafe would return true for any of the bindings. This
505 is used to avoid looping over all the bindings unnecessarily. */
506 BOOL_BITFIELD has_jump_unsafe_decl : 1;
509 /* The scope currently in effect. */
511 static GTY(()) struct c_scope *current_scope;
513 /* The innermost function scope. Ordinary (not explicitly declared)
514 labels, bindings to error_mark_node, and the lazily-created
515 bindings of __func__ and its friends get this scope. */
517 static GTY(()) struct c_scope *current_function_scope;
519 /* The C file scope. This is reset for each input translation unit. */
521 static GTY(()) struct c_scope *file_scope;
523 /* The outermost scope. This is used for all declarations with
524 external linkage, and only these, hence the name. */
526 static GTY(()) struct c_scope *external_scope;
528 /* A chain of c_scope structures awaiting reuse. */
530 static GTY((deletable)) struct c_scope *scope_freelist;
532 /* A chain of c_binding structures awaiting reuse. */
534 static GTY((deletable)) struct c_binding *binding_freelist;
536 /* Append VAR to LIST in scope SCOPE. */
537 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
538 struct c_scope *s_ = (scope); \
540 if (s_->list##_last) \
541 BLOCK_CHAIN (s_->list##_last) = d_; \
544 s_->list##_last = d_; \
547 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
548 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
549 struct c_scope *t_ = (tscope); \
550 struct c_scope *f_ = (fscope); \
552 BLOCK_CHAIN (t_->to##_last) = f_->from; \
555 t_->to##_last = f_->from##_last; \
558 /* A c_inline_static structure stores details of a static identifier
559 referenced in a definition of a function that may be an inline
560 definition if no subsequent declaration of that function uses
561 "extern" or does not use "inline". */
563 struct GTY((chain_next ("%h.next"))) c_inline_static {
564 /* The location for a diagnostic. */
567 /* The function that may be an inline definition. */
570 /* The object or function referenced. */
573 /* What sort of reference this is. */
574 enum c_inline_static_type type;
576 /* The next such structure or NULL. */
577 struct c_inline_static *next;
580 /* List of static identifiers used or referenced in functions that may
581 be inline definitions. */
582 static GTY(()) struct c_inline_static *c_inline_statics;
584 /* True means unconditionally make a BLOCK for the next scope pushed. */
586 static bool keep_next_level_flag;
588 /* True means the next call to push_scope will be the outermost scope
589 of a function body, so do not push a new scope, merely cease
590 expecting parameter decls. */
592 static bool next_is_function_body;
594 /* A vector of pointers to c_binding structures. */
596 typedef struct c_binding *c_binding_ptr;
598 /* Information that we keep for a struct or union while it is being
601 struct c_struct_parse_info
603 /* If warn_cxx_compat, a list of types defined within this
605 vec<tree> struct_types;
606 /* If warn_cxx_compat, a list of field names which have bindings,
607 and which are defined in this struct, but which are not defined
608 in any enclosing struct. This is used to clear the in_struct
609 field of the c_bindings structure. */
610 vec<c_binding_ptr> fields;
611 /* If warn_cxx_compat, a list of typedef names used when defining
612 fields in this struct. */
613 vec<tree> typedefs_seen;
616 /* Information for the struct or union currently being parsed, or
617 NULL if not parsing a struct or union. */
618 static struct c_struct_parse_info *struct_parse_info;
620 /* Forward declarations. */
621 static tree lookup_name_in_scope (tree, struct c_scope *);
622 static tree c_make_fname_decl (location_t, tree, int);
623 static tree grokdeclarator (const struct c_declarator *,
624 struct c_declspecs *,
625 enum decl_context, bool, tree *, tree *, tree *,
626 bool *, enum deprecated_states);
627 static tree grokparms (struct c_arg_info *, bool);
628 static void layout_array_type (tree);
629 static void warn_defaults_to (location_t, int, const char *, ...)
630 ATTRIBUTE_GCC_DIAG(3,4);
632 /* T is a statement. Add it to the statement-tree. This is the
633 C/ObjC version--C++ has a slightly different version of this
639 enum tree_code code = TREE_CODE (t);
641 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
643 if (!EXPR_HAS_LOCATION (t))
644 SET_EXPR_LOCATION (t, input_location);
647 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
648 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
650 /* Add T to the statement-tree. Non-side-effect statements need to be
651 recorded during statement expressions. */
652 if (!building_stmt_list_p ())
654 append_to_statement_list_force (t, &cur_stmt_list);
659 /* Build a pointer type using the default pointer mode. */
662 c_build_pointer_type (tree to_type)
664 addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC
665 : TYPE_ADDR_SPACE (to_type);
666 machine_mode pointer_mode;
668 if (as != ADDR_SPACE_GENERIC || c_default_pointer_mode == VOIDmode)
669 pointer_mode = targetm.addr_space.pointer_mode (as);
671 pointer_mode = c_default_pointer_mode;
672 return build_pointer_type_for_mode (to_type, pointer_mode, false);
676 /* Return true if we will want to say something if a goto statement
680 decl_jump_unsafe (tree decl)
682 if (error_operand_p (decl))
685 /* Always warn about crossing variably modified types. */
686 if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == TYPE_DECL)
687 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
690 /* Otherwise, only warn if -Wgoto-misses-init and this is an
691 initialized automatic decl. */
692 if (warn_jump_misses_init
693 && TREE_CODE (decl) == VAR_DECL
694 && !TREE_STATIC (decl)
695 && DECL_INITIAL (decl) != NULL_TREE)
703 c_print_identifier (FILE *file, tree node, int indent)
705 void (*save) (enum c_oracle_request, tree identifier);
707 /* Temporarily hide any binding oracle. Without this, calls to
708 debug_tree from the debugger will end up calling into the oracle,
709 making for a confusing debug session. As the oracle isn't needed
710 here for normal operation, it's simplest to suppress it. */
711 save = c_binding_oracle;
712 c_binding_oracle = NULL;
714 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
715 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
716 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
717 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
719 tree rid = ridpointers[C_RID_CODE (node)];
720 indent_to (file, indent + 4);
721 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
722 (void *) rid, IDENTIFIER_POINTER (rid));
725 c_binding_oracle = save;
728 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
729 which may be any of several kinds of DECL or TYPE or error_mark_node,
730 in the scope SCOPE. */
732 bind (tree name, tree decl, struct c_scope *scope, bool invisible,
733 bool nested, location_t locus)
735 struct c_binding *b, **here;
737 if (binding_freelist)
739 b = binding_freelist;
740 binding_freelist = b->prev;
743 b = ggc_alloc<c_binding> ();
748 b->depth = scope->depth;
749 b->invisible = invisible;
757 b->prev = scope->bindings;
760 if (decl_jump_unsafe (decl))
761 scope->has_jump_unsafe_decl = 1;
766 switch (TREE_CODE (decl))
768 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
771 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
777 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
783 /* Locate the appropriate place in the chain of shadowed decls
784 to insert this binding. Normally, scope == current_scope and
785 this does nothing. */
786 while (*here && (*here)->depth > scope->depth)
787 here = &(*here)->shadowed;
793 /* Clear the binding structure B, stick it on the binding_freelist,
794 and return the former value of b->prev. This is used by pop_scope
795 and get_parm_info to iterate destructively over all the bindings
796 from a given scope. */
797 static struct c_binding *
798 free_binding_and_advance (struct c_binding *b)
800 struct c_binding *prev = b->prev;
802 memset (b, 0, sizeof (struct c_binding));
803 b->prev = binding_freelist;
804 binding_freelist = b;
809 /* Bind a label. Like bind, but skip fields which aren't used for
810 labels, and add the LABEL_VARS value. */
812 bind_label (tree name, tree label, struct c_scope *scope,
813 struct c_label_vars *label_vars)
817 bind (name, label, scope, /*invisible=*/false, /*nested=*/false,
820 scope->has_label_bindings = true;
823 gcc_assert (b->decl == label);
824 label_vars->shadowed = b->u.label;
825 b->u.label = label_vars;
828 /* Hook called at end of compilation to assume 1 elt
829 for a file-scope tentative array defn that wasn't complete before. */
832 c_finish_incomplete_decl (tree decl)
834 if (TREE_CODE (decl) == VAR_DECL)
836 tree type = TREE_TYPE (decl);
837 if (type != error_mark_node
838 && TREE_CODE (type) == ARRAY_TYPE
839 && !DECL_EXTERNAL (decl)
840 && TYPE_DOMAIN (type) == 0)
842 warning_at (DECL_SOURCE_LOCATION (decl),
843 0, "array %q+D assumed to have one element", decl);
845 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
847 relayout_decl (decl);
852 /* Record that inline function FUNC contains a reference (location
853 LOC) to static DECL (file-scope or function-local according to
857 record_inline_static (location_t loc, tree func, tree decl,
858 enum c_inline_static_type type)
860 c_inline_static *csi = ggc_alloc<c_inline_static> ();
862 csi->function = func;
863 csi->static_decl = decl;
865 csi->next = c_inline_statics;
866 c_inline_statics = csi;
869 /* Check for references to static declarations in inline functions at
870 the end of the translation unit and diagnose them if the functions
871 are still inline definitions. */
874 check_inline_statics (void)
876 struct c_inline_static *csi;
877 for (csi = c_inline_statics; csi; csi = csi->next)
879 if (DECL_EXTERNAL (csi->function))
883 pedwarn (csi->location, 0,
884 "%qD is static but used in inline function %qD "
885 "which is not static", csi->static_decl, csi->function);
888 pedwarn (csi->location, 0,
889 "%q+D is static but declared in inline function %qD "
890 "which is not static", csi->static_decl, csi->function);
896 c_inline_statics = NULL;
899 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
900 for the current state, otherwise set it to uninitialized. */
903 set_spot_bindings (struct c_spot_bindings *p, bool defining)
907 p->scope = current_scope;
908 p->bindings_in_scope = current_scope->bindings;
913 p->bindings_in_scope = NULL;
916 p->left_stmt_expr = false;
919 /* Update spot bindings P as we pop out of SCOPE. Return true if we
920 should push decls for a label. */
923 update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p)
925 if (p->scope != scope)
927 /* This label or goto is defined in some other scope, or it is a
928 label which is not yet defined. There is nothing to
933 /* Adjust the spot bindings to refer to the bindings already defined
934 in the enclosing scope. */
935 p->scope = scope->outer;
936 p->bindings_in_scope = p->scope->bindings;
941 /* The Objective-C front-end often needs to determine the current scope. */
944 objc_get_current_scope (void)
946 return current_scope;
949 /* The following function is used only by Objective-C. It needs to live here
950 because it accesses the innards of c_scope. */
953 objc_mark_locals_volatile (void *enclosing_blk)
955 struct c_scope *scope;
958 for (scope = current_scope;
959 scope && scope != enclosing_blk;
960 scope = scope->outer)
962 for (b = scope->bindings; b; b = b->prev)
963 objc_volatilize_decl (b->decl);
965 /* Do not climb up past the current function. */
966 if (scope->function_body)
971 /* Return true if we are in the global binding level. */
974 global_bindings_p (void)
976 return current_scope == file_scope;
980 keep_next_level (void)
982 keep_next_level_flag = true;
985 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
988 set_float_const_decimal64 (void)
990 current_scope->float_const_decimal64 = true;
993 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
996 clear_float_const_decimal64 (void)
998 current_scope->float_const_decimal64 = false;
1001 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
1004 float_const_decimal64_p (void)
1006 return current_scope->float_const_decimal64;
1009 /* Identify this scope as currently being filled with parameters. */
1012 declare_parm_level (void)
1014 current_scope->parm_flag = true;
1020 if (next_is_function_body)
1022 /* This is the transition from the parameters to the top level
1023 of the function body. These are the same scope
1024 (C99 6.2.1p4,6) so we do not push another scope structure.
1025 next_is_function_body is set only by store_parm_decls, which
1026 in turn is called when and only when we are about to
1027 encounter the opening curly brace for the function body.
1029 The outermost block of a function always gets a BLOCK node,
1030 because the debugging output routines expect that each
1031 function has at least one BLOCK. */
1032 current_scope->parm_flag = false;
1033 current_scope->function_body = true;
1034 current_scope->keep = true;
1035 current_scope->outer_function = current_function_scope;
1036 current_function_scope = current_scope;
1038 keep_next_level_flag = false;
1039 next_is_function_body = false;
1041 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1042 if (current_scope->outer)
1043 current_scope->float_const_decimal64
1044 = current_scope->outer->float_const_decimal64;
1046 current_scope->float_const_decimal64 = false;
1050 struct c_scope *scope;
1053 scope = scope_freelist;
1054 scope_freelist = scope->outer;
1057 scope = ggc_cleared_alloc<c_scope> ();
1059 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1061 scope->float_const_decimal64 = current_scope->float_const_decimal64;
1063 scope->float_const_decimal64 = false;
1065 scope->keep = keep_next_level_flag;
1066 scope->outer = current_scope;
1067 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
1069 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
1071 if (current_scope && scope->depth == 0)
1074 sorry ("GCC supports only %u nested scopes", scope->depth);
1077 current_scope = scope;
1078 keep_next_level_flag = false;
1082 /* This is called when we are leaving SCOPE. For each label defined
1083 in SCOPE, add any appropriate decls to its decls_in_scope fields.
1084 These are the decls whose initialization will be skipped by a goto
1085 later in the function. */
1088 update_label_decls (struct c_scope *scope)
1095 if (s->has_label_bindings)
1097 struct c_binding *b;
1099 for (b = s->bindings; b != NULL; b = b->prev)
1101 struct c_label_vars *label_vars;
1102 struct c_binding *b1;
1105 struct c_goto_bindings *g;
1107 if (TREE_CODE (b->decl) != LABEL_DECL)
1109 label_vars = b->u.label;
1111 b1 = label_vars->label_bindings.bindings_in_scope;
1112 if (label_vars->label_bindings.scope == NULL)
1115 hjud = label_vars->label_bindings.scope->has_jump_unsafe_decl;
1116 if (update_spot_bindings (scope, &label_vars->label_bindings))
1118 /* This label is defined in this scope. */
1121 for (; b1 != NULL; b1 = b1->prev)
1123 /* A goto from later in the function to this
1124 label will never see the initialization
1125 of B1, if any. Save it to issue a
1126 warning if needed. */
1127 if (decl_jump_unsafe (b1->decl))
1128 vec_safe_push(label_vars->decls_in_scope, b1->decl);
1133 /* Update the bindings of any goto statements associated
1135 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1136 update_spot_bindings (scope, &g->goto_bindings);
1140 /* Don't search beyond the current function. */
1141 if (s == current_function_scope)
1148 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1151 set_type_context (tree type, tree context)
1153 for (type = TYPE_MAIN_VARIANT (type); type;
1154 type = TYPE_NEXT_VARIANT (type))
1155 TYPE_CONTEXT (type) = context;
1158 /* Exit a scope. Restore the state of the identifier-decl mappings
1159 that were in effect when this scope was entered. Return a BLOCK
1160 node containing all the DECLs in this scope that are of interest
1161 to debug info generation. */
1166 struct c_scope *scope = current_scope;
1167 tree block, context, p;
1168 struct c_binding *b;
1170 bool functionbody = scope->function_body;
1171 bool keep = functionbody || scope->keep || scope->bindings;
1173 update_label_decls (scope);
1175 /* If appropriate, create a BLOCK to record the decls for the life
1176 of this function. */
1180 block = make_node (BLOCK);
1181 BLOCK_SUBBLOCKS (block) = scope->blocks;
1182 TREE_USED (block) = 1;
1184 /* In each subblock, record that this is its superior. */
1185 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
1186 BLOCK_SUPERCONTEXT (p) = block;
1188 BLOCK_VARS (block) = 0;
1191 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1192 scope must be set so that they point to the appropriate
1193 construct, i.e. either to the current FUNCTION_DECL node, or
1194 else to the BLOCK node we just constructed.
1196 Note that for tagged types whose scope is just the formal
1197 parameter list for some function type specification, we can't
1198 properly set their TYPE_CONTEXTs here, because we don't have a
1199 pointer to the appropriate FUNCTION_TYPE node readily available
1200 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1201 type nodes get set in `grokdeclarator' as soon as we have created
1202 the FUNCTION_TYPE node which will represent the "scope" for these
1203 "parameter list local" tagged types. */
1204 if (scope->function_body)
1205 context = current_function_decl;
1206 else if (scope == file_scope)
1208 tree file_decl = build_translation_unit_decl (NULL_TREE);
1209 context = file_decl;
1210 debug_hooks->register_main_translation_unit (file_decl);
1215 /* Clear all bindings in this scope. */
1216 for (b = scope->bindings; b; b = free_binding_and_advance (b))
1219 switch (TREE_CODE (p))
1222 /* Warnings for unused labels, errors for undefined labels. */
1223 if (TREE_USED (p) && !DECL_INITIAL (p))
1225 error ("label %q+D used but not defined", p);
1226 DECL_INITIAL (p) = error_mark_node;
1229 warn_for_unused_label (p);
1231 /* Labels go in BLOCK_VARS. */
1232 DECL_CHAIN (p) = BLOCK_VARS (block);
1233 BLOCK_VARS (block) = p;
1234 gcc_assert (I_LABEL_BINDING (b->id) == b);
1235 I_LABEL_BINDING (b->id) = b->shadowed;
1237 /* Also pop back to the shadowed label_vars. */
1238 release_tree_vector (b->u.label->decls_in_scope);
1239 b->u.label = b->u.label->shadowed;
1245 set_type_context (p, context);
1247 /* Types may not have tag-names, in which case the type
1248 appears in the bindings list with b->id NULL. */
1251 gcc_assert (I_TAG_BINDING (b->id) == b);
1252 I_TAG_BINDING (b->id) = b->shadowed;
1257 /* Propagate TREE_ADDRESSABLE from nested functions to their
1258 containing functions. */
1259 if (!TREE_ASM_WRITTEN (p)
1260 && DECL_INITIAL (p) != 0
1261 && TREE_ADDRESSABLE (p)
1262 && DECL_ABSTRACT_ORIGIN (p) != 0
1263 && DECL_ABSTRACT_ORIGIN (p) != p)
1264 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
1265 if (!DECL_EXTERNAL (p)
1266 && !DECL_INITIAL (p)
1267 && scope != file_scope
1268 && scope != external_scope)
1270 error ("nested function %q+D declared but never defined", p);
1271 undef_nested_function = true;
1273 else if (DECL_DECLARED_INLINE_P (p)
1275 && !DECL_INITIAL (p))
1277 /* C99 6.7.4p6: "a function with external linkage... declared
1278 with an inline function specifier ... shall also be defined
1279 in the same translation unit." */
1280 if (!flag_gnu89_inline
1281 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (p))
1282 && scope != external_scope)
1283 pedwarn (input_location, 0,
1284 "inline function %q+D declared but never defined", p);
1285 DECL_EXTERNAL (p) = 1;
1291 /* Warnings for unused variables. */
1292 if ((!TREE_USED (p) || !DECL_READ_P (p))
1293 && !TREE_NO_WARNING (p)
1294 && !DECL_IN_SYSTEM_HEADER (p)
1296 && !DECL_ARTIFICIAL (p)
1297 && scope != file_scope
1298 && scope != external_scope)
1301 warning (OPT_Wunused_variable, "unused variable %q+D", p);
1302 else if (DECL_CONTEXT (p) == current_function_decl)
1303 warning_at (DECL_SOURCE_LOCATION (p),
1304 OPT_Wunused_but_set_variable,
1305 "variable %qD set but not used", p);
1310 error ("type of array %q+D completed incompatibly with"
1311 " implicit initialization", p);
1318 /* All of these go in BLOCK_VARS, but only if this is the
1319 binding in the home scope. */
1322 DECL_CHAIN (p) = BLOCK_VARS (block);
1323 BLOCK_VARS (block) = p;
1325 else if (VAR_OR_FUNCTION_DECL_P (p) && scope != file_scope)
1327 /* For block local externs add a special
1328 DECL_EXTERNAL decl for debug info generation. */
1329 tree extp = copy_node (p);
1331 DECL_EXTERNAL (extp) = 1;
1332 TREE_STATIC (extp) = 0;
1333 TREE_PUBLIC (extp) = 1;
1334 DECL_INITIAL (extp) = NULL_TREE;
1335 DECL_LANG_SPECIFIC (extp) = NULL;
1336 DECL_CONTEXT (extp) = current_function_decl;
1337 if (TREE_CODE (p) == FUNCTION_DECL)
1339 DECL_RESULT (extp) = NULL_TREE;
1340 DECL_SAVED_TREE (extp) = NULL_TREE;
1341 DECL_STRUCT_FUNCTION (extp) = NULL;
1343 if (b->locus != UNKNOWN_LOCATION)
1344 DECL_SOURCE_LOCATION (extp) = b->locus;
1345 DECL_CHAIN (extp) = BLOCK_VARS (block);
1346 BLOCK_VARS (block) = extp;
1348 /* If this is the file scope set DECL_CONTEXT of each decl to
1349 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1351 if (scope == file_scope)
1353 DECL_CONTEXT (p) = context;
1354 if (TREE_CODE (p) == TYPE_DECL
1355 && TREE_TYPE (p) != error_mark_node)
1356 set_type_context (TREE_TYPE (p), context);
1360 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1361 already been put there by store_parm_decls. Unused-
1362 parameter warnings are handled by function.c.
1363 error_mark_node obviously does not go in BLOCK_VARS and
1364 does not get unused-variable warnings. */
1367 /* It is possible for a decl not to have a name. We get
1368 here with b->id NULL in this case. */
1371 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
1372 I_SYMBOL_BINDING (b->id) = b->shadowed;
1373 if (b->shadowed && b->shadowed->u.type)
1374 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
1384 /* Dispose of the block that we just made inside some higher level. */
1385 if ((scope->function_body || scope == file_scope) && context)
1387 DECL_INITIAL (context) = block;
1388 BLOCK_SUPERCONTEXT (block) = context;
1390 else if (scope->outer)
1393 SCOPE_LIST_APPEND (scope->outer, blocks, block);
1394 /* If we did not make a block for the scope just exited, any
1395 blocks made for inner scopes must be carried forward so they
1396 will later become subblocks of something else. */
1397 else if (scope->blocks)
1398 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
1401 /* Pop the current scope, and free the structure for reuse. */
1402 current_scope = scope->outer;
1403 if (scope->function_body)
1404 current_function_scope = scope->outer_function;
1406 memset (scope, 0, sizeof (struct c_scope));
1407 scope->outer = scope_freelist;
1408 scope_freelist = scope;
1414 push_file_scope (void)
1422 file_scope = current_scope;
1424 start_fname_decls ();
1426 for (decl = visible_builtins; decl; decl = DECL_CHAIN (decl))
1427 bind (DECL_NAME (decl), decl, file_scope,
1428 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl));
1432 pop_file_scope (void)
1434 /* In case there were missing closebraces, get us back to the global
1436 while (current_scope != file_scope)
1439 /* __FUNCTION__ is defined at file scope (""). This
1440 call may not be necessary as my tests indicate it
1441 still works without it. */
1442 finish_fname_decls ();
1444 check_inline_statics ();
1446 /* This is the point to write out a PCH if we're doing that.
1447 In that case we do not want to do anything else. */
1450 c_common_write_pch ();
1454 /* Pop off the file scope and close this translation unit. */
1458 maybe_apply_pending_pragma_weaks ();
1461 /* Adjust the bindings for the start of a statement expression. */
1464 c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings)
1466 struct c_scope *scope;
1468 for (scope = current_scope; scope != NULL; scope = scope->outer)
1470 struct c_binding *b;
1472 if (!scope->has_label_bindings)
1475 for (b = scope->bindings; b != NULL; b = b->prev)
1477 struct c_label_vars *label_vars;
1479 struct c_goto_bindings *g;
1481 if (TREE_CODE (b->decl) != LABEL_DECL)
1483 label_vars = b->u.label;
1484 ++label_vars->label_bindings.stmt_exprs;
1485 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1486 ++g->goto_bindings.stmt_exprs;
1490 if (switch_bindings != NULL)
1491 ++switch_bindings->stmt_exprs;
1494 /* Adjust the bindings for the end of a statement expression. */
1497 c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings)
1499 struct c_scope *scope;
1501 for (scope = current_scope; scope != NULL; scope = scope->outer)
1503 struct c_binding *b;
1505 if (!scope->has_label_bindings)
1508 for (b = scope->bindings; b != NULL; b = b->prev)
1510 struct c_label_vars *label_vars;
1512 struct c_goto_bindings *g;
1514 if (TREE_CODE (b->decl) != LABEL_DECL)
1516 label_vars = b->u.label;
1517 --label_vars->label_bindings.stmt_exprs;
1518 if (label_vars->label_bindings.stmt_exprs < 0)
1520 label_vars->label_bindings.left_stmt_expr = true;
1521 label_vars->label_bindings.stmt_exprs = 0;
1523 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
1525 --g->goto_bindings.stmt_exprs;
1526 if (g->goto_bindings.stmt_exprs < 0)
1528 g->goto_bindings.left_stmt_expr = true;
1529 g->goto_bindings.stmt_exprs = 0;
1535 if (switch_bindings != NULL)
1537 --switch_bindings->stmt_exprs;
1538 gcc_assert (switch_bindings->stmt_exprs >= 0);
1542 /* Push a definition or a declaration of struct, union or enum tag "name".
1543 "type" should be the type node.
1544 We assume that the tag "name" is not already defined, and has a location
1547 Note that the definition may really be just a forward reference.
1548 In that case, the TYPE_SIZE will be zero. */
1551 pushtag (location_t loc, tree name, tree type)
1553 /* Record the identifier as the type's name if it has none. */
1554 if (name && !TYPE_NAME (type))
1555 TYPE_NAME (type) = name;
1556 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc);
1558 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1559 tagged type we just added to the current scope. This fake
1560 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1561 to output a representation of a tagged type, and it also gives
1562 us a convenient place to record the "scope start" address for the
1565 TYPE_STUB_DECL (type) = pushdecl (build_decl (loc,
1566 TYPE_DECL, NULL_TREE, type));
1568 /* An approximation for now, so we can tell this is a function-scope tag.
1569 This will be updated in pop_scope. */
1570 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1572 if (warn_cxx_compat && name != NULL_TREE)
1574 struct c_binding *b = I_SYMBOL_BINDING (name);
1577 && b->decl != NULL_TREE
1578 && TREE_CODE (b->decl) == TYPE_DECL
1579 && (B_IN_CURRENT_SCOPE (b)
1580 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
1581 && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl))
1582 != TYPE_MAIN_VARIANT (type)))
1584 warning_at (loc, OPT_Wc___compat,
1585 ("using %qD as both a typedef and a tag is "
1588 if (b->locus != UNKNOWN_LOCATION)
1589 inform (b->locus, "originally defined here");
1594 /* An exported interface to pushtag. This is used by the gdb plugin's
1595 binding oracle to introduce a new tag binding. */
1598 c_pushtag (location_t loc, tree name, tree type)
1600 pushtag (loc, name, type);
1603 /* An exported interface to bind a declaration. LOC is the location
1604 to use. DECL is the declaration to bind. The decl's name is used
1605 to determine how it is bound. If DECL is a VAR_DECL, then
1606 IS_GLOBAL determines whether the decl is put into the global (file
1607 and external) scope or the current function's scope; if DECL is not
1608 a VAR_DECL then it is always put into the file scope. */
1611 c_bind (location_t loc, tree decl, bool is_global)
1613 struct c_scope *scope;
1614 bool nested = false;
1616 if (TREE_CODE (decl) != VAR_DECL || current_function_scope == NULL)
1618 /* Types and functions are always considered to be global. */
1620 DECL_EXTERNAL (decl) = 1;
1621 TREE_PUBLIC (decl) = 1;
1625 /* Also bind it into the external scope. */
1626 bind (DECL_NAME (decl), decl, external_scope, true, false, loc);
1629 DECL_EXTERNAL (decl) = 1;
1630 TREE_PUBLIC (decl) = 1;
1634 DECL_CONTEXT (decl) = current_function_decl;
1635 TREE_PUBLIC (decl) = 0;
1636 scope = current_function_scope;
1639 bind (DECL_NAME (decl), decl, scope, false, nested, loc);
1642 /* Subroutine of compare_decls. Allow harmless mismatches in return
1643 and argument types provided that the type modes match. This function
1644 return a unified type given a suitable match, and 0 otherwise. */
1647 match_builtin_function_types (tree newtype, tree oldtype)
1649 tree newrettype, oldrettype;
1650 tree newargs, oldargs;
1651 tree trytype, tryargs;
1653 /* Accept the return type of the new declaration if same modes. */
1654 oldrettype = TREE_TYPE (oldtype);
1655 newrettype = TREE_TYPE (newtype);
1657 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1660 oldargs = TYPE_ARG_TYPES (oldtype);
1661 newargs = TYPE_ARG_TYPES (newtype);
1664 while (oldargs || newargs)
1668 || !TREE_VALUE (oldargs)
1669 || !TREE_VALUE (newargs)
1670 || TYPE_MODE (TREE_VALUE (oldargs))
1671 != TYPE_MODE (TREE_VALUE (newargs)))
1674 oldargs = TREE_CHAIN (oldargs);
1675 newargs = TREE_CHAIN (newargs);
1678 trytype = build_function_type (newrettype, tryargs);
1679 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1682 /* Subroutine of diagnose_mismatched_decls. Check for function type
1683 mismatch involving an empty arglist vs a nonempty one and give clearer
1686 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1687 tree newtype, tree oldtype)
1691 if (TREE_CODE (olddecl) != FUNCTION_DECL
1692 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1693 || !((!prototype_p (oldtype) && DECL_INITIAL (olddecl) == 0)
1694 || (!prototype_p (newtype) && DECL_INITIAL (newdecl) == 0)))
1697 t = TYPE_ARG_TYPES (oldtype);
1699 t = TYPE_ARG_TYPES (newtype);
1700 for (; t; t = TREE_CHAIN (t))
1702 tree type = TREE_VALUE (t);
1704 if (TREE_CHAIN (t) == 0
1705 && TYPE_MAIN_VARIANT (type) != void_type_node)
1707 inform (input_location, "a parameter list with an ellipsis can%'t match "
1708 "an empty parameter name list declaration");
1712 if (c_type_promotes_to (type) != type)
1714 inform (input_location, "an argument type that has a default promotion can%'t match "
1715 "an empty parameter name list declaration");
1721 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1722 old-style function definition, NEWDECL is a prototype declaration.
1723 Diagnose inconsistencies in the argument list. Returns TRUE if
1724 the prototype is compatible, FALSE if not. */
1726 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1728 tree newargs, oldargs;
1731 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1733 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1734 newargs = TYPE_ARG_TYPES (newtype);
1739 tree oldargtype = TREE_VALUE (oldargs);
1740 tree newargtype = TREE_VALUE (newargs);
1742 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1745 oldargtype = (TYPE_ATOMIC (oldargtype)
1746 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype),
1748 : TYPE_MAIN_VARIANT (oldargtype));
1749 newargtype = (TYPE_ATOMIC (newargtype)
1750 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype),
1752 : TYPE_MAIN_VARIANT (newargtype));
1754 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1757 /* Reaching the end of just one list means the two decls don't
1758 agree on the number of arguments. */
1759 if (END_OF_ARGLIST (oldargtype))
1761 error ("prototype for %q+D declares more arguments "
1762 "than previous old-style definition", newdecl);
1765 else if (END_OF_ARGLIST (newargtype))
1767 error ("prototype for %q+D declares fewer arguments "
1768 "than previous old-style definition", newdecl);
1772 /* Type for passing arg must be consistent with that declared
1774 else if (!comptypes (oldargtype, newargtype))
1776 error ("prototype for %q+D declares argument %d"
1777 " with incompatible type",
1782 oldargs = TREE_CHAIN (oldargs);
1783 newargs = TREE_CHAIN (newargs);
1787 /* If we get here, no errors were found, but do issue a warning
1788 for this poor-style construct. */
1789 warning (0, "prototype for %q+D follows non-prototype definition",
1792 #undef END_OF_ARGLIST
1795 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1796 first in a pair of mismatched declarations, using the diagnostic
1799 locate_old_decl (tree decl)
1801 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)
1802 && !C_DECL_DECLARED_BUILTIN (decl))
1804 else if (DECL_INITIAL (decl))
1805 inform (input_location, "previous definition of %q+D was here", decl);
1806 else if (C_DECL_IMPLICIT (decl))
1807 inform (input_location, "previous implicit declaration of %q+D was here", decl);
1809 inform (input_location, "previous declaration of %q+D was here", decl);
1812 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1813 Returns true if the caller should proceed to merge the two, false
1814 if OLDDECL should simply be discarded. As a side effect, issues
1815 all necessary diagnostics for invalid or poor-style combinations.
1816 If it returns true, writes the types of NEWDECL and OLDDECL to
1817 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1818 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1821 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1822 tree *newtypep, tree *oldtypep)
1824 tree newtype, oldtype;
1825 bool pedwarned = false;
1826 bool warned = false;
1829 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1830 && DECL_EXTERNAL (DECL))
1832 /* If we have error_mark_node for either decl or type, just discard
1833 the previous decl - we're in an error cascade already. */
1834 if (olddecl == error_mark_node || newdecl == error_mark_node)
1836 *oldtypep = oldtype = TREE_TYPE (olddecl);
1837 *newtypep = newtype = TREE_TYPE (newdecl);
1838 if (oldtype == error_mark_node || newtype == error_mark_node)
1841 /* Two different categories of symbol altogether. This is an error
1842 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1843 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1845 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1846 && DECL_BUILT_IN (olddecl)
1847 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1849 error ("%q+D redeclared as different kind of symbol", newdecl);
1850 locate_old_decl (olddecl);
1852 else if (TREE_PUBLIC (newdecl))
1853 warning (0, "built-in function %q+D declared as non-function",
1856 warning (OPT_Wshadow, "declaration of %q+D shadows "
1857 "a built-in function", newdecl);
1861 /* Enumerators have no linkage, so may only be declared once in a
1863 if (TREE_CODE (olddecl) == CONST_DECL)
1865 error ("redeclaration of enumerator %q+D", newdecl);
1866 locate_old_decl (olddecl);
1870 if (!comptypes (oldtype, newtype))
1872 if (TREE_CODE (olddecl) == FUNCTION_DECL
1873 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1875 /* Accept harmless mismatch in function types.
1876 This is for the ffs and fprintf builtins. */
1877 tree trytype = match_builtin_function_types (newtype, oldtype);
1879 if (trytype && comptypes (newtype, trytype))
1880 *oldtypep = oldtype = trytype;
1883 /* If types don't match for a built-in, throw away the
1884 built-in. No point in calling locate_old_decl here, it
1885 won't print anything. */
1886 warning (0, "conflicting types for built-in function %q+D",
1891 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1892 && DECL_IS_BUILTIN (olddecl))
1894 /* A conflicting function declaration for a predeclared
1895 function that isn't actually built in. Objective C uses
1896 these. The new declaration silently overrides everything
1897 but the volatility (i.e. noreturn) indication. See also
1898 below. FIXME: Make Objective C use normal builtins. */
1899 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1902 /* Permit void foo (...) to match int foo (...) if the latter is
1903 the definition and implicit int was used. See
1904 c-torture/compile/920625-2.c. */
1905 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1906 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1907 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1908 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1910 pedwarned = pedwarn (input_location, 0,
1911 "conflicting types for %q+D", newdecl);
1912 /* Make sure we keep void as the return type. */
1913 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1914 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1916 /* Permit void foo (...) to match an earlier call to foo (...) with
1917 no declared type (thus, implicitly int). */
1918 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1919 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1920 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1921 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1923 pedwarned = pedwarn (input_location, 0,
1924 "conflicting types for %q+D", newdecl);
1925 /* Make sure we keep void as the return type. */
1926 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1930 int new_quals = TYPE_QUALS (newtype);
1931 int old_quals = TYPE_QUALS (oldtype);
1933 if (new_quals != old_quals)
1935 addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals);
1936 addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals);
1937 if (new_addr != old_addr)
1939 if (ADDR_SPACE_GENERIC_P (new_addr))
1940 error ("conflicting named address spaces (generic vs %s) "
1942 c_addr_space_name (old_addr), newdecl);
1943 else if (ADDR_SPACE_GENERIC_P (old_addr))
1944 error ("conflicting named address spaces (%s vs generic) "
1946 c_addr_space_name (new_addr), newdecl);
1948 error ("conflicting named address spaces (%s vs %s) "
1950 c_addr_space_name (new_addr),
1951 c_addr_space_name (old_addr),
1955 if (CLEAR_QUAL_ADDR_SPACE (new_quals)
1956 != CLEAR_QUAL_ADDR_SPACE (old_quals))
1957 error ("conflicting type qualifiers for %q+D", newdecl);
1960 error ("conflicting types for %q+D", newdecl);
1961 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1962 locate_old_decl (olddecl);
1967 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1968 but silently ignore the redeclaration if either is in a system
1969 header. (Conflicting redeclarations were handled above.) This
1970 is allowed for C11 if the types are the same, not just
1972 if (TREE_CODE (newdecl) == TYPE_DECL)
1974 bool types_different = false;
1975 int comptypes_result;
1978 = comptypes_check_different_types (oldtype, newtype, &types_different);
1980 if (comptypes_result != 1 || types_different)
1982 error ("redefinition of typedef %q+D with different type", newdecl);
1983 locate_old_decl (olddecl);
1987 if (DECL_IN_SYSTEM_HEADER (newdecl)
1988 || DECL_IN_SYSTEM_HEADER (olddecl)
1989 || TREE_NO_WARNING (newdecl)
1990 || TREE_NO_WARNING (olddecl))
1991 return true; /* Allow OLDDECL to continue in use. */
1993 if (variably_modified_type_p (newtype, NULL))
1995 error ("redefinition of typedef %q+D with variably modified type",
1997 locate_old_decl (olddecl);
1999 else if (pedwarn_c99 (input_location, OPT_Wpedantic,
2000 "redefinition of typedef %q+D", newdecl))
2001 locate_old_decl (olddecl);
2006 /* Function declarations can either be 'static' or 'extern' (no
2007 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
2008 can never conflict with each other on account of linkage
2009 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
2010 gnu89 mode permits two definitions if one is 'extern inline' and
2011 one is not. The non- extern-inline definition supersedes the
2012 extern-inline definition. */
2014 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2016 /* If you declare a built-in function name as static, or
2017 define the built-in with an old-style definition (so we
2018 can't validate the argument list) the built-in definition is
2019 overridden, but optionally warn this was a bad choice of name. */
2020 if (DECL_BUILT_IN (olddecl)
2021 && !C_DECL_DECLARED_BUILTIN (olddecl)
2022 && (!TREE_PUBLIC (newdecl)
2023 || (DECL_INITIAL (newdecl)
2024 && !prototype_p (TREE_TYPE (newdecl)))))
2026 warning (OPT_Wshadow, "declaration of %q+D shadows "
2027 "a built-in function", newdecl);
2028 /* Discard the old built-in function. */
2032 if (DECL_INITIAL (newdecl))
2034 if (DECL_INITIAL (olddecl))
2036 /* If both decls are in the same TU and the new declaration
2037 isn't overriding an extern inline reject the new decl.
2038 In c99, no overriding is allowed in the same translation
2040 if ((!DECL_EXTERN_INLINE (olddecl)
2041 || DECL_EXTERN_INLINE (newdecl)
2042 || (!flag_gnu89_inline
2043 && (!DECL_DECLARED_INLINE_P (olddecl)
2044 || !lookup_attribute ("gnu_inline",
2045 DECL_ATTRIBUTES (olddecl)))
2046 && (!DECL_DECLARED_INLINE_P (newdecl)
2047 || !lookup_attribute ("gnu_inline",
2048 DECL_ATTRIBUTES (newdecl))))
2050 && same_translation_unit_p (newdecl, olddecl))
2052 error ("redefinition of %q+D", newdecl);
2053 locate_old_decl (olddecl);
2058 /* If we have a prototype after an old-style function definition,
2059 the argument types must be checked specially. */
2060 else if (DECL_INITIAL (olddecl)
2061 && !prototype_p (oldtype) && prototype_p (newtype)
2062 && TYPE_ACTUAL_ARG_TYPES (oldtype)
2063 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
2065 locate_old_decl (olddecl);
2068 /* A non-static declaration (even an "extern") followed by a
2069 static declaration is undefined behavior per C99 6.2.2p3-5,7.
2070 The same is true for a static forward declaration at block
2071 scope followed by a non-static declaration/definition at file
2072 scope. Static followed by non-static at the same scope is
2073 not undefined behavior, and is the most convenient way to get
2074 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
2075 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
2076 we do diagnose it if -Wtraditional. */
2077 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
2079 /* Two exceptions to the rule. If olddecl is an extern
2080 inline, or a predeclared function that isn't actually
2081 built in, newdecl silently overrides olddecl. The latter
2082 occur only in Objective C; see also above. (FIXME: Make
2083 Objective C use normal builtins.) */
2084 if (!DECL_IS_BUILTIN (olddecl)
2085 && !DECL_EXTERN_INLINE (olddecl))
2087 error ("static declaration of %q+D follows "
2088 "non-static declaration", newdecl);
2089 locate_old_decl (olddecl);
2093 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
2095 if (DECL_CONTEXT (olddecl))
2097 error ("non-static declaration of %q+D follows "
2098 "static declaration", newdecl);
2099 locate_old_decl (olddecl);
2102 else if (warn_traditional)
2104 warned |= warning (OPT_Wtraditional,
2105 "non-static declaration of %q+D "
2106 "follows static declaration", newdecl);
2110 /* Make sure gnu_inline attribute is either not present, or
2111 present on all inline decls. */
2112 if (DECL_DECLARED_INLINE_P (olddecl)
2113 && DECL_DECLARED_INLINE_P (newdecl))
2115 bool newa = lookup_attribute ("gnu_inline",
2116 DECL_ATTRIBUTES (newdecl)) != NULL;
2117 bool olda = lookup_attribute ("gnu_inline",
2118 DECL_ATTRIBUTES (olddecl)) != NULL;
2121 error_at (input_location, "%<gnu_inline%> attribute present on %q+D",
2122 newa ? newdecl : olddecl);
2123 error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl),
2128 else if (TREE_CODE (newdecl) == VAR_DECL)
2130 /* Only variables can be thread-local, and all declarations must
2131 agree on this property. */
2132 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
2134 /* Nothing to check. Since OLDDECL is marked threadprivate
2135 and NEWDECL does not have a thread-local attribute, we
2136 will merge the threadprivate attribute into NEWDECL. */
2139 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
2141 if (DECL_THREAD_LOCAL_P (newdecl))
2142 error ("thread-local declaration of %q+D follows "
2143 "non-thread-local declaration", newdecl);
2145 error ("non-thread-local declaration of %q+D follows "
2146 "thread-local declaration", newdecl);
2148 locate_old_decl (olddecl);
2152 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2153 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
2155 error ("redefinition of %q+D", newdecl);
2156 locate_old_decl (olddecl);
2160 /* Objects declared at file scope: if the first declaration had
2161 external linkage (even if it was an external reference) the
2162 second must have external linkage as well, or the behavior is
2163 undefined. If the first declaration had internal linkage, then
2164 the second must too, or else be an external reference (in which
2165 case the composite declaration still has internal linkage).
2166 As for function declarations, we warn about the static-then-
2167 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2168 if (DECL_FILE_SCOPE_P (newdecl)
2169 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
2171 if (DECL_EXTERNAL (newdecl))
2173 if (!DECL_FILE_SCOPE_P (olddecl))
2175 error ("extern declaration of %q+D follows "
2176 "declaration with no linkage", newdecl);
2177 locate_old_decl (olddecl);
2180 else if (warn_traditional)
2182 warned |= warning (OPT_Wtraditional,
2183 "non-static declaration of %q+D "
2184 "follows static declaration", newdecl);
2189 if (TREE_PUBLIC (newdecl))
2190 error ("non-static declaration of %q+D follows "
2191 "static declaration", newdecl);
2193 error ("static declaration of %q+D follows "
2194 "non-static declaration", newdecl);
2196 locate_old_decl (olddecl);
2200 /* Two objects with the same name declared at the same block
2201 scope must both be external references (6.7p3). */
2202 else if (!DECL_FILE_SCOPE_P (newdecl))
2204 if (DECL_EXTERNAL (newdecl))
2206 /* Extern with initializer at block scope, which will
2207 already have received an error. */
2209 else if (DECL_EXTERNAL (olddecl))
2211 error ("declaration of %q+D with no linkage follows "
2212 "extern declaration", newdecl);
2213 locate_old_decl (olddecl);
2217 error ("redeclaration of %q+D with no linkage", newdecl);
2218 locate_old_decl (olddecl);
2224 /* C++ does not permit a decl to appear multiple times at file
2227 && DECL_FILE_SCOPE_P (newdecl)
2228 && !DECL_EXTERNAL (newdecl)
2229 && !DECL_EXTERNAL (olddecl))
2230 warned |= warning_at (DECL_SOURCE_LOCATION (newdecl),
2232 ("duplicate declaration of %qD is "
2238 /* All decls must agree on a visibility. */
2239 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
2240 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
2241 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2243 warned |= warning (0, "redeclaration of %q+D with different visibility "
2244 "(old visibility preserved)", newdecl);
2247 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2249 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2250 if (DECL_DECLARED_INLINE_P (newdecl)
2251 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2252 warned |= warning (OPT_Wattributes,
2253 "inline declaration of %qD follows "
2254 "declaration with attribute noinline", newdecl);
2255 else if (DECL_DECLARED_INLINE_P (olddecl)
2256 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
2257 warned |= warning (OPT_Wattributes,
2258 "declaration of %q+D with attribute "
2259 "noinline follows inline declaration ", newdecl);
2260 else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl))
2261 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl)))
2262 warned |= warning (OPT_Wattributes,
2263 "declaration of %q+D with attribute "
2264 "%qs follows declaration with attribute %qs",
2265 newdecl, "noinline", "always_inline");
2266 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl))
2267 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2268 warned |= warning (OPT_Wattributes,
2269 "declaration of %q+D with attribute "
2270 "%qs follows declaration with attribute %qs",
2271 newdecl, "always_inline", "noinline");
2272 else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl))
2273 && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl)))
2274 warned |= warning (OPT_Wattributes,
2275 "declaration of %q+D with attribute %qs follows "
2276 "declaration with attribute %qs", newdecl, "cold",
2278 else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl))
2279 && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl)))
2280 warned |= warning (OPT_Wattributes,
2281 "declaration of %q+D with attribute %qs follows "
2282 "declaration with attribute %qs", newdecl, "hot",
2285 else /* PARM_DECL, VAR_DECL */
2287 /* Redeclaration of a parameter is a constraint violation (this is
2288 not explicitly stated, but follows from C99 6.7p3 [no more than
2289 one declaration of the same identifier with no linkage in the
2290 same scope, except type tags] and 6.2.2p6 [parameters have no
2291 linkage]). We must check for a forward parameter declaration,
2292 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2293 an extension, the mandatory diagnostic for which is handled by
2294 mark_forward_parm_decls. */
2296 if (TREE_CODE (newdecl) == PARM_DECL
2297 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
2299 error ("redefinition of parameter %q+D", newdecl);
2300 locate_old_decl (olddecl);
2305 /* Optional warning for completely redundant decls. */
2306 if (!warned && !pedwarned
2307 && warn_redundant_decls
2308 /* Don't warn about a function declaration followed by a
2310 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2311 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
2312 /* Don't warn about redundant redeclarations of builtins. */
2313 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2314 && !DECL_BUILT_IN (newdecl)
2315 && DECL_BUILT_IN (olddecl)
2316 && !C_DECL_DECLARED_BUILTIN (olddecl))
2317 /* Don't warn about an extern followed by a definition. */
2318 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
2319 /* Don't warn about forward parameter decls. */
2320 && !(TREE_CODE (newdecl) == PARM_DECL
2321 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2322 /* Don't warn about a variable definition following a declaration. */
2323 && !(TREE_CODE (newdecl) == VAR_DECL
2324 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
2326 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
2330 /* Report location of previous decl/defn. */
2331 if (warned || pedwarned)
2332 locate_old_decl (olddecl);
2334 #undef DECL_EXTERN_INLINE
2339 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2340 consistent with OLDDECL, but carries new information. Merge the
2341 new information into OLDDECL. This function issues no
2345 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
2347 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
2348 && DECL_INITIAL (newdecl) != 0);
2349 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
2350 && prototype_p (TREE_TYPE (newdecl)));
2351 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
2352 && prototype_p (TREE_TYPE (olddecl)));
2354 /* For real parm decl following a forward decl, rechain the old decl
2355 in its new location and clear TREE_ASM_WRITTEN (it's not a
2356 forward decl anymore). */
2357 if (TREE_CODE (newdecl) == PARM_DECL
2358 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2360 struct c_binding *b, **here;
2362 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
2363 if ((*here)->decl == olddecl)
2370 b->prev = current_scope->bindings;
2371 current_scope->bindings = b;
2373 TREE_ASM_WRITTEN (olddecl) = 0;
2376 DECL_ATTRIBUTES (newdecl)
2377 = targetm.merge_decl_attributes (olddecl, newdecl);
2379 /* Merge the data types specified in the two decls. */
2381 = TREE_TYPE (olddecl)
2382 = composite_type (newtype, oldtype);
2384 /* Lay the type out, unless already done. */
2385 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
2387 if (TREE_TYPE (newdecl) != error_mark_node)
2388 layout_type (TREE_TYPE (newdecl));
2389 if (TREE_CODE (newdecl) != FUNCTION_DECL
2390 && TREE_CODE (newdecl) != TYPE_DECL
2391 && TREE_CODE (newdecl) != CONST_DECL)
2392 layout_decl (newdecl, 0);
2396 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2397 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
2398 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
2399 DECL_MODE (newdecl) = DECL_MODE (olddecl);
2400 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2402 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2403 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2407 /* Keep the old rtl since we can safely use it. */
2408 if (HAS_RTL_P (olddecl))
2409 COPY_DECL_RTL (olddecl, newdecl);
2411 /* Merge the type qualifiers. */
2412 if (TREE_READONLY (newdecl))
2413 TREE_READONLY (olddecl) = 1;
2415 if (TREE_THIS_VOLATILE (newdecl))
2416 TREE_THIS_VOLATILE (olddecl) = 1;
2418 /* Merge deprecatedness. */
2419 if (TREE_DEPRECATED (newdecl))
2420 TREE_DEPRECATED (olddecl) = 1;
2422 /* If a decl is in a system header and the other isn't, keep the one on the
2423 system header. Otherwise, keep source location of definition rather than
2424 declaration and of prototype rather than non-prototype unless that
2425 prototype is built-in. */
2426 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2427 && DECL_IN_SYSTEM_HEADER (olddecl)
2428 && !DECL_IN_SYSTEM_HEADER (newdecl) )
2429 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2430 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2431 && DECL_IN_SYSTEM_HEADER (newdecl)
2432 && !DECL_IN_SYSTEM_HEADER (olddecl))
2433 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
2434 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
2435 || (old_is_prototype && !new_is_prototype
2436 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
2437 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2439 /* Merge the initialization information. */
2440 if (DECL_INITIAL (newdecl) == 0)
2441 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2443 /* Merge the threadprivate attribute. */
2444 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
2445 C_DECL_THREADPRIVATE_P (newdecl) = 1;
2447 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
2449 /* Copy the assembler name.
2450 Currently, it can only be defined in the prototype. */
2451 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2453 /* Use visibility of whichever declaration had it specified */
2454 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2456 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2457 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2460 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2462 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2463 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2464 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2465 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2466 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2467 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2468 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2469 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2470 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2471 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2472 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
2475 /* Merge the storage class information. */
2476 merge_weak (newdecl, olddecl);
2478 /* For functions, static overrides non-static. */
2479 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2481 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2482 /* This is since we don't automatically
2483 copy the attributes of NEWDECL into OLDDECL. */
2484 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2485 /* If this clears `static', clear it in the identifier too. */
2486 if (!TREE_PUBLIC (olddecl))
2487 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2491 /* In c99, 'extern' declaration before (or after) 'inline' means this
2492 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2494 if (TREE_CODE (newdecl) == FUNCTION_DECL
2495 && !flag_gnu89_inline
2496 && (DECL_DECLARED_INLINE_P (newdecl)
2497 || DECL_DECLARED_INLINE_P (olddecl))
2498 && (!DECL_DECLARED_INLINE_P (newdecl)
2499 || !DECL_DECLARED_INLINE_P (olddecl)
2500 || !DECL_EXTERNAL (olddecl))
2501 && DECL_EXTERNAL (newdecl)
2502 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
2503 && !current_function_decl)
2504 DECL_EXTERNAL (newdecl) = 0;
2506 /* An inline definition following a static declaration is not
2508 if (new_is_definition
2509 && (DECL_DECLARED_INLINE_P (newdecl)
2510 || DECL_DECLARED_INLINE_P (olddecl))
2511 && !TREE_PUBLIC (olddecl))
2512 DECL_EXTERNAL (newdecl) = 0;
2514 if (DECL_EXTERNAL (newdecl))
2516 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2517 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2519 /* An extern decl does not override previous storage class. */
2520 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2521 if (!DECL_EXTERNAL (newdecl))
2523 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2524 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2529 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2530 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2533 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2535 /* If we're redefining a function previously defined as extern
2536 inline, make sure we emit debug info for the inline before we
2537 throw it away, in case it was inlined into a function that
2538 hasn't been written out yet. */
2539 if (new_is_definition && DECL_INITIAL (olddecl))
2540 /* The new defn must not be inline. */
2541 DECL_UNINLINABLE (newdecl) = 1;
2544 /* If either decl says `inline', this fn is inline, unless
2545 its definition was passed already. */
2546 if (DECL_DECLARED_INLINE_P (newdecl)
2547 || DECL_DECLARED_INLINE_P (olddecl))
2548 DECL_DECLARED_INLINE_P (newdecl) = 1;
2550 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2551 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2553 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2554 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2555 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2556 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2559 if (DECL_BUILT_IN (olddecl))
2561 /* If redeclaring a builtin function, it stays built in.
2562 But it gets tagged as having been declared. */
2563 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2564 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2565 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
2566 if (new_is_prototype)
2568 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
2569 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2571 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2574 /* If a compatible prototype of these builtin functions
2575 is seen, assume the runtime implements it with the
2576 expected semantics. */
2577 case BUILT_IN_STPCPY:
2578 if (builtin_decl_explicit_p (fncode))
2579 set_builtin_decl_implicit_p (fncode, true);
2582 if (builtin_decl_explicit_p (fncode))
2583 set_builtin_decl_declared_p (fncode, true);
2589 C_DECL_BUILTIN_PROTOTYPE (newdecl)
2590 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
2593 /* Preserve function specific target and optimization options */
2594 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2595 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2596 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2597 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2599 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2600 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2601 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2602 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2604 /* Also preserve various other info from the definition. */
2605 if (!new_is_definition)
2608 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2609 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2610 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2611 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2612 DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl));
2613 for (t = DECL_ARGUMENTS (newdecl); t ; t = DECL_CHAIN (t))
2614 DECL_CONTEXT (t) = newdecl;
2616 /* See if we've got a function to instantiate from. */
2617 if (DECL_SAVED_TREE (olddecl))
2618 DECL_ABSTRACT_ORIGIN (newdecl)
2619 = DECL_ABSTRACT_ORIGIN (olddecl);
2623 /* Merge the USED information. */
2624 if (TREE_USED (olddecl))
2625 TREE_USED (newdecl) = 1;
2626 else if (TREE_USED (newdecl))
2627 TREE_USED (olddecl) = 1;
2628 if (TREE_CODE (olddecl) == VAR_DECL || TREE_CODE (olddecl) == PARM_DECL)
2629 DECL_READ_P (newdecl) |= DECL_READ_P (olddecl);
2630 if (DECL_PRESERVE_P (olddecl))
2631 DECL_PRESERVE_P (newdecl) = 1;
2632 else if (DECL_PRESERVE_P (newdecl))
2633 DECL_PRESERVE_P (olddecl) = 1;
2635 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2636 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2637 DECL_ARGUMENTS (if appropriate). */
2639 unsigned olddecl_uid = DECL_UID (olddecl);
2640 tree olddecl_context = DECL_CONTEXT (olddecl);
2641 tree olddecl_arguments = NULL;
2642 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2643 olddecl_arguments = DECL_ARGUMENTS (olddecl);
2645 memcpy ((char *) olddecl + sizeof (struct tree_common),
2646 (char *) newdecl + sizeof (struct tree_common),
2647 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2648 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2649 switch (TREE_CODE (olddecl))
2654 struct symtab_node *snode = olddecl->decl_with_vis.symtab_node;
2656 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2657 (char *) newdecl + sizeof (struct tree_decl_common),
2658 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2659 olddecl->decl_with_vis.symtab_node = snode;
2661 if ((DECL_EXTERNAL (olddecl)
2662 || TREE_PUBLIC (olddecl)
2663 || TREE_STATIC (olddecl))
2664 && DECL_SECTION_NAME (newdecl) != NULL)
2665 set_decl_section_name (olddecl, DECL_SECTION_NAME (newdecl));
2667 /* This isn't quite correct for something like
2668 int __thread x attribute ((tls_model ("local-exec")));
2669 extern int __thread x;
2670 as we'll lose the "local-exec" model. */
2671 if (TREE_CODE (olddecl) == VAR_DECL
2672 && DECL_THREAD_LOCAL_P (newdecl))
2673 set_decl_tls_model (olddecl, DECL_TLS_MODEL (newdecl));
2683 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2684 (char *) newdecl + sizeof (struct tree_decl_common),
2685 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2690 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2691 (char *) newdecl + sizeof (struct tree_decl_common),
2692 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
2694 DECL_UID (olddecl) = olddecl_uid;
2695 DECL_CONTEXT (olddecl) = olddecl_context;
2696 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2697 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
2700 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2701 so that encode_section_info has a chance to look at the new decl
2702 flags and attributes. */
2703 if (DECL_RTL_SET_P (olddecl)
2704 && (TREE_CODE (olddecl) == FUNCTION_DECL
2705 || (TREE_CODE (olddecl) == VAR_DECL
2706 && TREE_STATIC (olddecl))))
2707 make_decl_rtl (olddecl);
2710 /* Handle when a new declaration NEWDECL has the same name as an old
2711 one OLDDECL in the same binding contour. Prints an error message
2714 If safely possible, alter OLDDECL to look like NEWDECL, and return
2715 true. Otherwise, return false. */
2718 duplicate_decls (tree newdecl, tree olddecl)
2720 tree newtype = NULL, oldtype = NULL;
2722 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
2724 /* Avoid `unused variable' and other warnings for OLDDECL. */
2725 TREE_NO_WARNING (olddecl) = 1;
2729 merge_decls (newdecl, olddecl, newtype, oldtype);
2731 /* The NEWDECL will no longer be needed.
2733 Before releasing the node, be sure to remove function from symbol
2734 table that might have been inserted there to record comdat group.
2735 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2736 structure is shared in between NEWDECL and OLDECL. */
2737 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2738 DECL_STRUCT_FUNCTION (newdecl) = NULL;
2739 if (TREE_CODE (newdecl) == FUNCTION_DECL
2740 || TREE_CODE (newdecl) == VAR_DECL)
2742 struct symtab_node *snode = symtab_node::get (newdecl);
2751 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2753 warn_if_shadowing (tree new_decl)
2755 struct c_binding *b;
2757 /* Shadow warnings wanted? */
2759 /* No shadow warnings for internally generated vars. */
2760 || DECL_IS_BUILTIN (new_decl)
2761 /* No shadow warnings for vars made for inlining. */
2762 || DECL_FROM_INLINE (new_decl))
2765 /* Is anything being shadowed? Invisible decls do not count. */
2766 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
2767 if (b->decl && b->decl != new_decl && !b->invisible
2768 && (b->decl == error_mark_node
2769 || diagnostic_report_warnings_p (global_dc,
2770 DECL_SOURCE_LOCATION (b->decl))))
2772 tree old_decl = b->decl;
2773 bool warned = false;
2775 if (old_decl == error_mark_node)
2777 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
2778 "non-variable", new_decl);
2781 else if (TREE_CODE (old_decl) == PARM_DECL)
2782 warned = warning (OPT_Wshadow,
2783 "declaration of %q+D shadows a parameter",
2785 else if (DECL_FILE_SCOPE_P (old_decl))
2787 /* Do not warn if a variable shadows a function, unless
2788 the variable is a function or a pointer-to-function. */
2789 if (TREE_CODE (old_decl) == FUNCTION_DECL
2790 && TREE_CODE (new_decl) != FUNCTION_DECL
2791 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl)))
2794 warned = warning_at (DECL_SOURCE_LOCATION (new_decl), OPT_Wshadow,
2795 "declaration of %qD shadows a global "
2799 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2800 && DECL_BUILT_IN (old_decl))
2802 warning (OPT_Wshadow, "declaration of %q+D shadows "
2803 "a built-in function", new_decl);
2807 warned = warning (OPT_Wshadow, "declaration of %q+D shadows a "
2808 "previous local", new_decl);
2811 inform (DECL_SOURCE_LOCATION (old_decl),
2812 "shadowed declaration is here");
2818 /* Record a decl-node X as belonging to the current lexical scope.
2819 Check for errors (such as an incompatible declaration for the same
2820 name already seen in the same scope).
2822 Returns either X or an old decl for the same name.
2823 If an old decl is returned, it may have been smashed
2824 to agree with what X says. */
2829 tree name = DECL_NAME (x);
2830 struct c_scope *scope = current_scope;
2831 struct c_binding *b;
2832 bool nested = false;
2833 location_t locus = DECL_SOURCE_LOCATION (x);
2835 /* Must set DECL_CONTEXT for everything not at file scope or
2836 DECL_FILE_SCOPE_P won't work. Local externs don't count
2837 unless they have initializers (which generate code). */
2838 if (current_function_decl
2839 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2840 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2841 DECL_CONTEXT (x) = current_function_decl;
2843 /* Anonymous decls are just inserted in the scope. */
2846 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
2851 /* First, see if there is another declaration with the same name in
2852 the current scope. If there is, duplicate_decls may do all the
2853 work for us. If duplicate_decls returns false, that indicates
2854 two incompatible decls in the same scope; we are to silently
2855 replace the old one (duplicate_decls has issued all appropriate
2856 diagnostics). In particular, we should not consider possible
2857 duplicates in the external scope, or shadowing. */
2858 b = I_SYMBOL_BINDING (name);
2859 if (b && B_IN_SCOPE (b, scope))
2861 struct c_binding *b_ext, *b_use;
2862 tree type = TREE_TYPE (x);
2863 tree visdecl = b->decl;
2864 tree vistype = TREE_TYPE (visdecl);
2865 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2866 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2867 b->inner_comp = false;
2870 /* If this is an external linkage declaration, we should check
2871 for compatibility with the type in the external scope before
2872 setting the type at this scope based on the visible
2873 information only. */
2874 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2876 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2877 b_ext = b_ext->shadowed;
2882 TREE_TYPE (b_use->decl) = b_use->u.type;
2885 if (duplicate_decls (x, b_use->decl))
2889 /* Save the updated type in the external scope and
2890 restore the proper type for this scope. */
2892 if (comptypes (vistype, type))
2893 thistype = composite_type (vistype, type);
2895 thistype = TREE_TYPE (b_use->decl);
2896 b_use->u.type = TREE_TYPE (b_use->decl);
2897 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2898 && DECL_BUILT_IN (b_use->decl))
2900 = build_type_attribute_variant (thistype,
2903 TREE_TYPE (b_use->decl) = thistype;
2908 goto skip_external_and_shadow_checks;
2911 /* All declarations with external linkage, and all external
2912 references, go in the external scope, no matter what scope is
2913 current. However, the binding in that scope is ignored for
2914 purposes of normal name lookup. A separate binding structure is
2915 created in the requested scope; this governs the normal
2916 visibility of the symbol.
2918 The binding in the externals scope is used exclusively for
2919 detecting duplicate declarations of the same object, no matter
2920 what scope they are in; this is what we do here. (C99 6.2.7p2:
2921 All declarations that refer to the same object or function shall
2922 have compatible type; otherwise, the behavior is undefined.) */
2923 if (DECL_EXTERNAL (x) || scope == file_scope)
2925 tree type = TREE_TYPE (x);
2928 bool type_saved = false;
2929 if (b && !B_IN_EXTERNAL_SCOPE (b)
2930 && (TREE_CODE (b->decl) == FUNCTION_DECL
2931 || TREE_CODE (b->decl) == VAR_DECL)
2932 && DECL_FILE_SCOPE_P (b->decl))
2935 vistype = TREE_TYPE (visdecl);
2937 if (scope != file_scope
2938 && !DECL_IN_SYSTEM_HEADER (x))
2939 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2941 while (b && !B_IN_EXTERNAL_SCOPE (b))
2943 /* If this decl might be modified, save its type. This is
2944 done here rather than when the decl is first bound
2945 because the type may change after first binding, through
2946 being completed or through attributes being added. If we
2947 encounter multiple such decls, only the first should have
2948 its type saved; the others will already have had their
2949 proper types saved and the types will not have changed as
2950 their scopes will not have been re-entered. */
2951 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2953 b->u.type = TREE_TYPE (b->decl);
2956 if (B_IN_FILE_SCOPE (b)
2957 && TREE_CODE (b->decl) == VAR_DECL
2958 && TREE_STATIC (b->decl)
2959 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2960 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2961 && TREE_CODE (type) == ARRAY_TYPE
2962 && TYPE_DOMAIN (type)
2963 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2964 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2966 /* Array type completed in inner scope, which should be
2967 diagnosed if the completion does not have size 1 and
2968 it does not get completed in the file scope. */
2969 b->inner_comp = true;
2974 /* If a matching external declaration has been found, set its
2975 type to the composite of all the types of that declaration.
2976 After the consistency checks, it will be reset to the
2977 composite of the visible types only. */
2978 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2980 TREE_TYPE (b->decl) = b->u.type;
2982 /* The point of the same_translation_unit_p check here is,
2983 we want to detect a duplicate decl for a construct like
2984 foo() { extern bar(); } ... static bar(); but not if
2985 they are in different translation units. In any case,
2986 the static does not go in the externals scope. */
2988 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2989 && duplicate_decls (x, b->decl))
2994 if (comptypes (vistype, type))
2995 thistype = composite_type (vistype, type);
2997 thistype = TREE_TYPE (b->decl);
3001 b->u.type = TREE_TYPE (b->decl);
3002 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
3004 = build_type_attribute_variant (thistype,
3005 TYPE_ATTRIBUTES (b->u.type));
3006 TREE_TYPE (b->decl) = thistype;
3007 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
3011 else if (TREE_PUBLIC (x))
3013 if (visdecl && !b && duplicate_decls (x, visdecl))
3015 /* An external declaration at block scope referring to a
3016 visible entity with internal linkage. The composite
3017 type will already be correct for this scope, so we
3018 just need to fall through to make the declaration in
3025 bind (name, x, external_scope, /*invisible=*/true,
3026 /*nested=*/false, locus);
3032 if (TREE_CODE (x) != PARM_DECL)
3033 warn_if_shadowing (x);
3035 skip_external_and_shadow_checks:
3036 if (TREE_CODE (x) == TYPE_DECL)
3038 /* So this is a typedef, set its underlying type. */
3039 set_underlying_type (x);
3041 /* If X is a typedef defined in the current function, record it
3042 for the purpose of implementing the -Wunused-local-typedefs
3044 record_locally_defined_typedef (x);
3047 bind (name, x, scope, /*invisible=*/false, nested, locus);
3049 /* If x's type is incomplete because it's based on a
3050 structure or union which has not yet been fully declared,
3051 attach it to that structure or union type, so we can go
3052 back and complete the variable declaration later, if the
3053 structure or union gets fully declared.
3055 If the input is erroneous, we can have error_mark in the type
3056 slot (e.g. "f(void a, ...)") - that doesn't count as an
3058 if (TREE_TYPE (x) != error_mark_node
3059 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
3061 tree element = TREE_TYPE (x);
3063 while (TREE_CODE (element) == ARRAY_TYPE)
3064 element = TREE_TYPE (element);
3065 element = TYPE_MAIN_VARIANT (element);
3067 if ((TREE_CODE (element) == RECORD_TYPE
3068 || TREE_CODE (element) == UNION_TYPE)
3069 && (TREE_CODE (x) != TYPE_DECL
3070 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
3071 && !COMPLETE_TYPE_P (element))
3072 C_TYPE_INCOMPLETE_VARS (element)
3073 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
3078 /* Record X as belonging to file scope.
3079 This is used only internally by the Objective-C front end,
3080 and is limited to its needs. duplicate_decls is not called;
3081 if there is any preexisting decl for this identifier, it is an ICE. */
3084 pushdecl_top_level (tree x)
3087 bool nested = false;
3088 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
3090 name = DECL_NAME (x);
3092 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
3094 if (TREE_PUBLIC (x))
3096 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false,
3101 bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION);
3107 implicit_decl_warning (location_t loc, tree id, tree olddecl)
3109 if (warn_implicit_function_declaration)
3114 warned = pedwarn (loc, OPT_Wimplicit_function_declaration,
3115 "implicit declaration of function %qE", id);
3117 warned = warning_at (loc, OPT_Wimplicit_function_declaration,
3118 G_("implicit declaration of function %qE"), id);
3119 if (olddecl && warned)
3120 locate_old_decl (olddecl);
3124 /* This function represents mapping of a function code FCODE
3125 to its respective header. */
3128 header_for_builtin_fn (enum built_in_function fcode)
3132 CASE_FLT_FN (BUILT_IN_ACOS):
3133 CASE_FLT_FN (BUILT_IN_ACOSH):
3134 CASE_FLT_FN (BUILT_IN_ASIN):
3135 CASE_FLT_FN (BUILT_IN_ASINH):
3136 CASE_FLT_FN (BUILT_IN_ATAN):
3137 CASE_FLT_FN (BUILT_IN_ATANH):
3138 CASE_FLT_FN (BUILT_IN_ATAN2):
3139 CASE_FLT_FN (BUILT_IN_CBRT):
3140 CASE_FLT_FN (BUILT_IN_CEIL):
3141 CASE_FLT_FN (BUILT_IN_COPYSIGN):
3142 CASE_FLT_FN (BUILT_IN_COS):
3143 CASE_FLT_FN (BUILT_IN_COSH):
3144 CASE_FLT_FN (BUILT_IN_ERF):
3145 CASE_FLT_FN (BUILT_IN_ERFC):
3146 CASE_FLT_FN (BUILT_IN_EXP):
3147 CASE_FLT_FN (BUILT_IN_EXP2):
3148 CASE_FLT_FN (BUILT_IN_EXPM1):
3149 CASE_FLT_FN (BUILT_IN_FABS):
3150 CASE_FLT_FN (BUILT_IN_FDIM):
3151 CASE_FLT_FN (BUILT_IN_FLOOR):
3152 CASE_FLT_FN (BUILT_IN_FMA):
3153 CASE_FLT_FN (BUILT_IN_FMAX):
3154 CASE_FLT_FN (BUILT_IN_FMIN):
3155 CASE_FLT_FN (BUILT_IN_FMOD):
3156 CASE_FLT_FN (BUILT_IN_FREXP):
3157 CASE_FLT_FN (BUILT_IN_HYPOT):
3158 CASE_FLT_FN (BUILT_IN_ILOGB):
3159 CASE_FLT_FN (BUILT_IN_LDEXP):
3160 CASE_FLT_FN (BUILT_IN_LGAMMA):
3161 CASE_FLT_FN (BUILT_IN_LLRINT):
3162 CASE_FLT_FN (BUILT_IN_LLROUND):
3163 CASE_FLT_FN (BUILT_IN_LOG):
3164 CASE_FLT_FN (BUILT_IN_LOG10):
3165 CASE_FLT_FN (BUILT_IN_LOG1P):
3166 CASE_FLT_FN (BUILT_IN_LOG2):
3167 CASE_FLT_FN (BUILT_IN_LOGB):
3168 CASE_FLT_FN (BUILT_IN_LRINT):
3169 CASE_FLT_FN (BUILT_IN_LROUND):
3170 CASE_FLT_FN (BUILT_IN_MODF):
3171 CASE_FLT_FN (BUILT_IN_NAN):
3172 CASE_FLT_FN (BUILT_IN_NEARBYINT):
3173 CASE_FLT_FN (BUILT_IN_NEXTAFTER):
3174 CASE_FLT_FN (BUILT_IN_NEXTTOWARD):
3175 CASE_FLT_FN (BUILT_IN_POW):
3176 CASE_FLT_FN (BUILT_IN_REMAINDER):
3177 CASE_FLT_FN (BUILT_IN_REMQUO):
3178 CASE_FLT_FN (BUILT_IN_RINT):
3179 CASE_FLT_FN (BUILT_IN_ROUND):
3180 CASE_FLT_FN (BUILT_IN_SCALBLN):
3181 CASE_FLT_FN (BUILT_IN_SCALBN):
3182 CASE_FLT_FN (BUILT_IN_SIN):
3183 CASE_FLT_FN (BUILT_IN_SINH):
3184 CASE_FLT_FN (BUILT_IN_SINCOS):
3185 CASE_FLT_FN (BUILT_IN_SQRT):
3186 CASE_FLT_FN (BUILT_IN_TAN):
3187 CASE_FLT_FN (BUILT_IN_TANH):
3188 CASE_FLT_FN (BUILT_IN_TGAMMA):
3189 CASE_FLT_FN (BUILT_IN_TRUNC):
3190 case BUILT_IN_ISINF:
3191 case BUILT_IN_ISNAN:
3193 CASE_FLT_FN (BUILT_IN_CABS):
3194 CASE_FLT_FN (BUILT_IN_CACOS):
3195 CASE_FLT_FN (BUILT_IN_CACOSH):
3196 CASE_FLT_FN (BUILT_IN_CARG):
3197 CASE_FLT_FN (BUILT_IN_CASIN):
3198 CASE_FLT_FN (BUILT_IN_CASINH):
3199 CASE_FLT_FN (BUILT_IN_CATAN):
3200 CASE_FLT_FN (BUILT_IN_CATANH):
3201 CASE_FLT_FN (BUILT_IN_CCOS):
3202 CASE_FLT_FN (BUILT_IN_CCOSH):
3203 CASE_FLT_FN (BUILT_IN_CEXP):
3204 CASE_FLT_FN (BUILT_IN_CIMAG):
3205 CASE_FLT_FN (BUILT_IN_CLOG):
3206 CASE_FLT_FN (BUILT_IN_CONJ):
3207 CASE_FLT_FN (BUILT_IN_CPOW):
3208 CASE_FLT_FN (BUILT_IN_CPROJ):
3209 CASE_FLT_FN (BUILT_IN_CREAL):
3210 CASE_FLT_FN (BUILT_IN_CSIN):
3211 CASE_FLT_FN (BUILT_IN_CSINH):
3212 CASE_FLT_FN (BUILT_IN_CSQRT):
3213 CASE_FLT_FN (BUILT_IN_CTAN):
3214 CASE_FLT_FN (BUILT_IN_CTANH):
3215 return "<complex.h>";
3216 case BUILT_IN_MEMCHR:
3217 case BUILT_IN_MEMCMP:
3218 case BUILT_IN_MEMCPY:
3219 case BUILT_IN_MEMMOVE:
3220 case BUILT_IN_MEMSET:
3221 case BUILT_IN_STRCAT:
3222 case BUILT_IN_STRCHR:
3223 case BUILT_IN_STRCMP:
3224 case BUILT_IN_STRCPY:
3225 case BUILT_IN_STRCSPN:
3226 case BUILT_IN_STRLEN:
3227 case BUILT_IN_STRNCAT:
3228 case BUILT_IN_STRNCMP:
3229 case BUILT_IN_STRNCPY:
3230 case BUILT_IN_STRPBRK:
3231 case BUILT_IN_STRRCHR:
3232 case BUILT_IN_STRSPN:
3233 case BUILT_IN_STRSTR:
3234 return "<string.h>";
3235 case BUILT_IN_FPRINTF:
3237 case BUILT_IN_FPUTC:
3238 case BUILT_IN_FPUTS:
3239 case BUILT_IN_FSCANF:
3240 case BUILT_IN_FWRITE:
3241 case BUILT_IN_PRINTF:
3242 case BUILT_IN_PUTCHAR:
3244 case BUILT_IN_SCANF:
3245 case BUILT_IN_SNPRINTF:
3246 case BUILT_IN_SPRINTF:
3247 case BUILT_IN_SSCANF:
3248 case BUILT_IN_VFPRINTF:
3249 case BUILT_IN_VFSCANF:
3250 case BUILT_IN_VPRINTF:
3251 case BUILT_IN_VSCANF:
3252 case BUILT_IN_VSNPRINTF:
3253 case BUILT_IN_VSPRINTF:
3254 case BUILT_IN_VSSCANF:
3256 case BUILT_IN_ISALNUM:
3257 case BUILT_IN_ISALPHA:
3258 case BUILT_IN_ISBLANK:
3259 case BUILT_IN_ISCNTRL:
3260 case BUILT_IN_ISDIGIT:
3261 case BUILT_IN_ISGRAPH:
3262 case BUILT_IN_ISLOWER:
3263 case BUILT_IN_ISPRINT:
3264 case BUILT_IN_ISPUNCT:
3265 case BUILT_IN_ISSPACE:
3266 case BUILT_IN_ISUPPER:
3267 case BUILT_IN_ISXDIGIT:
3268 case BUILT_IN_TOLOWER:
3269 case BUILT_IN_TOUPPER:
3271 case BUILT_IN_ISWALNUM:
3272 case BUILT_IN_ISWALPHA:
3273 case BUILT_IN_ISWBLANK:
3274 case BUILT_IN_ISWCNTRL:
3275 case BUILT_IN_ISWDIGIT:
3276 case BUILT_IN_ISWGRAPH:
3277 case BUILT_IN_ISWLOWER:
3278 case BUILT_IN_ISWPRINT:
3279 case BUILT_IN_ISWPUNCT:
3280 case BUILT_IN_ISWSPACE:
3281 case BUILT_IN_ISWUPPER:
3282 case BUILT_IN_ISWXDIGIT:
3283 case BUILT_IN_TOWLOWER:
3284 case BUILT_IN_TOWUPPER:
3285 return "<wctype.h>";
3286 case BUILT_IN_ABORT:
3288 case BUILT_IN_CALLOC:
3292 case BUILT_IN_LLABS:
3293 case BUILT_IN_MALLOC:
3294 case BUILT_IN_REALLOC:
3295 case BUILT_IN__EXIT2:
3296 case BUILT_IN_ALIGNED_ALLOC:
3297 return "<stdlib.h>";
3298 case BUILT_IN_IMAXABS:
3299 return "<inttypes.h>";
3300 case BUILT_IN_STRFTIME:
3307 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
3308 function of type int (). */
3311 implicitly_declare (location_t loc, tree functionid)
3313 struct c_binding *b;
3317 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
3319 if (B_IN_SCOPE (b, external_scope))
3328 if (decl == error_mark_node)
3331 /* FIXME: Objective-C has weird not-really-builtin functions
3332 which are supposed to be visible automatically. They wind up
3333 in the external scope because they're pushed before the file
3334 scope gets created. Catch this here and rebind them into the
3336 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
3338 bind (functionid, decl, file_scope,
3339 /*invisible=*/false, /*nested=*/true,
3340 DECL_SOURCE_LOCATION (decl));
3345 tree newtype = default_function_type;
3347 TREE_TYPE (decl) = b->u.type;
3348 /* Implicit declaration of a function already declared
3349 (somehow) in a different scope, or as a built-in.
3350 If this is the first time this has happened, warn;
3351 then recycle the old declaration but with the new type. */
3352 if (!C_DECL_IMPLICIT (decl))
3354 implicit_decl_warning (loc, functionid, decl);
3355 C_DECL_IMPLICIT (decl) = 1;
3357 if (DECL_BUILT_IN (decl))
3359 newtype = build_type_attribute_variant (newtype,
3361 (TREE_TYPE (decl)));
3362 if (!comptypes (newtype, TREE_TYPE (decl)))
3364 bool warned = warning_at (loc, 0, "incompatible implicit "
3365 "declaration of built-in "
3366 "function %qD", decl);
3367 /* See if we can hint which header to include. */
3369 = header_for_builtin_fn (DECL_FUNCTION_CODE (decl));
3370 if (header != NULL && warned)
3371 inform (loc, "include %qs or provide a declaration of %qD",
3373 newtype = TREE_TYPE (decl);
3378 if (!comptypes (newtype, TREE_TYPE (decl)))
3380 error_at (loc, "incompatible implicit declaration of "
3381 "function %qD", decl);
3382 locate_old_decl (decl);
3385 b->u.type = TREE_TYPE (decl);
3386 TREE_TYPE (decl) = newtype;
3387 bind (functionid, decl, current_scope,
3388 /*invisible=*/false, /*nested=*/true,
3389 DECL_SOURCE_LOCATION (decl));
3394 /* Not seen before. */
3395 decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type);
3396 DECL_EXTERNAL (decl) = 1;
3397 TREE_PUBLIC (decl) = 1;
3398 C_DECL_IMPLICIT (decl) = 1;
3399 implicit_decl_warning (loc, functionid, 0);
3400 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
3402 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
3404 /* C89 says implicit declarations are in the innermost block.
3405 So we record the decl in the standard fashion. */
3406 decl = pushdecl (decl);
3408 /* No need to call objc_check_decl here - it's a function type. */
3409 rest_of_decl_compilation (decl, 0, 0);
3411 /* Write a record describing this implicit function declaration
3412 to the prototypes file (if requested). */
3413 gen_aux_info_record (decl, 0, 1, 0);
3415 /* Possibly apply some default attributes to this implicit declaration. */
3416 decl_attributes (&decl, NULL_TREE, 0);
3421 /* Issue an error message for a reference to an undeclared variable
3422 ID, including a reference to a builtin outside of function-call
3423 context. Establish a binding of the identifier to error_mark_node
3424 in an appropriate scope, which will suppress further errors for the
3425 same identifier. The error message should be given location LOC. */
3427 undeclared_variable (location_t loc, tree id)
3429 static bool already = false;
3430 struct c_scope *scope;
3432 if (current_function_decl == 0)
3434 error_at (loc, "%qE undeclared here (not in a function)", id);
3435 scope = current_scope;
3439 if (!objc_diagnose_private_ivar (id))
3440 error_at (loc, "%qE undeclared (first use in this function)", id);
3443 inform (loc, "each undeclared identifier is reported only"
3444 " once for each function it appears in");
3448 /* If we are parsing old-style parameter decls, current_function_decl
3449 will be nonnull but current_function_scope will be null. */
3450 scope = current_function_scope ? current_function_scope : current_scope;
3452 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
3456 /* Subroutine of lookup_label, declare_label, define_label: construct a
3457 LABEL_DECL with all the proper frills. Also create a struct
3458 c_label_vars initialized for the current scope. */
3461 make_label (location_t location, tree name, bool defining,
3462 struct c_label_vars **p_label_vars)
3464 tree label = build_decl (location, LABEL_DECL, name, void_type_node);
3465 DECL_CONTEXT (label) = current_function_decl;
3466 DECL_MODE (label) = VOIDmode;
3468 c_label_vars *label_vars = ggc_alloc<c_label_vars> ();
3469 label_vars->shadowed = NULL;
3470 set_spot_bindings (&label_vars->label_bindings, defining);
3471 label_vars->decls_in_scope = make_tree_vector ();
3472 label_vars->gotos = NULL;
3473 *p_label_vars = label_vars;
3478 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3479 Create one if none exists so far for the current function.
3480 This is called when a label is used in a goto expression or
3481 has its address taken. */
3484 lookup_label (tree name)
3487 struct c_label_vars *label_vars;
3489 if (current_function_scope == 0)
3491 error ("label %qE referenced outside of any function", name);
3495 /* Use a label already defined or ref'd with this name, but not if
3496 it is inherited from a containing function and wasn't declared
3498 label = I_LABEL_DECL (name);
3499 if (label && (DECL_CONTEXT (label) == current_function_decl
3500 || C_DECLARED_LABEL_FLAG (label)))
3502 /* If the label has only been declared, update its apparent
3503 location to point here, for better diagnostics if it
3504 turns out not to have been defined. */
3505 if (DECL_INITIAL (label) == NULL_TREE)
3506 DECL_SOURCE_LOCATION (label) = input_location;
3510 /* No label binding for that identifier; make one. */
3511 label = make_label (input_location, name, false, &label_vars);
3513 /* Ordinary labels go in the current function scope. */
3514 bind_label (name, label, current_function_scope, label_vars);
3519 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3523 warn_about_goto (location_t goto_loc, tree label, tree decl)
3525 if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3527 "jump into scope of identifier with variably modified type");
3529 warning_at (goto_loc, OPT_Wjump_misses_init,
3530 "jump skips variable initialization");
3531 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3532 inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl);
3535 /* Look up a label because of a goto statement. This is like
3536 lookup_label, but also issues any appropriate warnings. */
3539 lookup_label_for_goto (location_t loc, tree name)
3542 struct c_label_vars *label_vars;
3546 label = lookup_label (name);
3547 if (label == NULL_TREE)
3550 /* If we are jumping to a different function, we can't issue any
3552 if (DECL_CONTEXT (label) != current_function_decl)
3554 gcc_assert (C_DECLARED_LABEL_FLAG (label));
3558 label_vars = I_LABEL_BINDING (name)->u.label;
3560 /* If the label has not yet been defined, then push this goto on a
3561 list for possible later warnings. */
3562 if (label_vars->label_bindings.scope == NULL)
3564 c_goto_bindings *g = ggc_alloc<c_goto_bindings> ();
3567 set_spot_bindings (&g->goto_bindings, true);
3568 vec_safe_push (label_vars->gotos, g);
3572 /* If there are any decls in label_vars->decls_in_scope, then this
3573 goto has missed the declaration of the decl. This happens for a
3579 Issue a warning or error. */
3580 FOR_EACH_VEC_SAFE_ELT (label_vars->decls_in_scope, ix, decl)
3581 warn_about_goto (loc, label, decl);
3583 if (label_vars->label_bindings.left_stmt_expr)
3585 error_at (loc, "jump into statement expression");
3586 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3592 /* Make a label named NAME in the current function, shadowing silently
3593 any that may be inherited from containing functions or containing
3594 scopes. This is called for __label__ declarations. */
3597 declare_label (tree name)
3599 struct c_binding *b = I_LABEL_BINDING (name);
3601 struct c_label_vars *label_vars;
3603 /* Check to make sure that the label hasn't already been declared
3605 if (b && B_IN_CURRENT_SCOPE (b))
3607 error ("duplicate label declaration %qE", name);
3608 locate_old_decl (b->decl);
3610 /* Just use the previous declaration. */
3614 label = make_label (input_location, name, false, &label_vars);
3615 C_DECLARED_LABEL_FLAG (label) = 1;
3617 /* Declared labels go in the current scope. */
3618 bind_label (name, label, current_scope, label_vars);
3623 /* When we define a label, issue any appropriate warnings if there are
3624 any gotos earlier in the function which jump to this label. */
3627 check_earlier_gotos (tree label, struct c_label_vars* label_vars)
3630 struct c_goto_bindings *g;
3632 FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g)
3634 struct c_binding *b;
3635 struct c_scope *scope;
3637 /* We have a goto to this label. The goto is going forward. In
3638 g->scope, the goto is going to skip any binding which was
3639 defined after g->bindings_in_scope. */
3640 if (g->goto_bindings.scope->has_jump_unsafe_decl)
3642 for (b = g->goto_bindings.scope->bindings;
3643 b != g->goto_bindings.bindings_in_scope;
3646 if (decl_jump_unsafe (b->decl))
3647 warn_about_goto (g->loc, label, b->decl);
3651 /* We also need to warn about decls defined in any scopes
3652 between the scope of the label and the scope of the goto. */
3653 for (scope = label_vars->label_bindings.scope;
3654 scope != g->goto_bindings.scope;
3655 scope = scope->outer)
3657 gcc_assert (scope != NULL);
3658 if (scope->has_jump_unsafe_decl)
3660 if (scope == label_vars->label_bindings.scope)
3661 b = label_vars->label_bindings.bindings_in_scope;
3663 b = scope->bindings;
3664 for (; b != NULL; b = b->prev)
3666 if (decl_jump_unsafe (b->decl))
3667 warn_about_goto (g->loc, label, b->decl);
3672 if (g->goto_bindings.stmt_exprs > 0)
3674 error_at (g->loc, "jump into statement expression");
3675 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here",
3680 /* Now that the label is defined, we will issue warnings about
3681 subsequent gotos to this label when we see them. */
3682 vec_safe_truncate (label_vars->gotos, 0);
3683 label_vars->gotos = NULL;
3686 /* Define a label, specifying the location in the source file.
3687 Return the LABEL_DECL node for the label, if the definition is valid.
3688 Otherwise return 0. */
3691 define_label (location_t location, tree name)
3693 /* Find any preexisting label with this name. It is an error
3694 if that label has already been defined in this function, or
3695 if there is a containing function with a declared label with
3697 tree label = I_LABEL_DECL (name);
3700 && ((DECL_CONTEXT (label) == current_function_decl
3701 && DECL_INITIAL (label) != 0)
3702 || (DECL_CONTEXT (label) != current_function_decl
3703 && C_DECLARED_LABEL_FLAG (label))))
3705 error_at (location, "duplicate label %qD", label);
3706 locate_old_decl (label);
3709 else if (label && DECL_CONTEXT (label) == current_function_decl)
3711 struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label;
3713 /* The label has been used or declared already in this function,
3714 but not defined. Update its location to point to this
3716 DECL_SOURCE_LOCATION (label) = location;
3717 set_spot_bindings (&label_vars->label_bindings, true);
3719 /* Issue warnings as required about any goto statements from
3720 earlier in the function. */
3721 check_earlier_gotos (label, label_vars);
3725 struct c_label_vars *label_vars;
3727 /* No label binding for that identifier; make one. */
3728 label = make_label (location, name, true, &label_vars);
3730 /* Ordinary labels go in the current function scope. */
3731 bind_label (name, label, current_function_scope, label_vars);
3734 if (!in_system_header_at (input_location) && lookup_name (name))
3735 warning_at (location, OPT_Wtraditional,
3736 "traditional C lacks a separate namespace "
3737 "for labels, identifier %qE conflicts", name);
3739 /* Mark label as having been defined. */
3740 DECL_INITIAL (label) = error_mark_node;
3744 /* Get the bindings for a new switch statement. This is used to issue
3745 warnings as appropriate for jumps from the switch to case or
3748 struct c_spot_bindings *
3749 c_get_switch_bindings (void)
3751 struct c_spot_bindings *switch_bindings;
3753 switch_bindings = XNEW (struct c_spot_bindings);
3754 set_spot_bindings (switch_bindings, true);
3755 return switch_bindings;
3759 c_release_switch_bindings (struct c_spot_bindings *bindings)
3761 gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr);
3765 /* This is called at the point of a case or default label to issue
3766 warnings about decls as needed. It returns true if it found an
3767 error, not just a warning. */
3770 c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings,
3771 location_t switch_loc, location_t case_loc)
3774 struct c_scope *scope;
3777 for (scope = current_scope;
3778 scope != switch_bindings->scope;
3779 scope = scope->outer)
3781 struct c_binding *b;
3783 gcc_assert (scope != NULL);
3785 if (!scope->has_jump_unsafe_decl)
3788 for (b = scope->bindings; b != NULL; b = b->prev)
3790 if (decl_jump_unsafe (b->decl))
3792 if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE))
3796 ("switch jumps into scope of identifier with "
3797 "variably modified type"));
3800 warning_at (case_loc, OPT_Wjump_misses_init,
3801 "switch jumps over variable initialization");
3802 inform (switch_loc, "switch starts here");
3803 inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here",
3809 if (switch_bindings->stmt_exprs > 0)
3812 error_at (case_loc, "switch jumps into statement expression");
3813 inform (switch_loc, "switch starts here");
3819 /* Given NAME, an IDENTIFIER_NODE,
3820 return the structure (or union or enum) definition for that name.
3821 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3822 CODE says which kind of type the caller wants;
3823 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3824 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3825 location where the tag was defined.
3826 If the wrong kind of type is found, an error is reported. */
3829 lookup_tag (enum tree_code code, tree name, int thislevel_only,
3832 struct c_binding *b = I_TAG_BINDING (name);
3838 /* We only care about whether it's in this level if
3839 thislevel_only was set or it might be a type clash. */
3840 if (thislevel_only || TREE_CODE (b->decl) != code)
3842 /* For our purposes, a tag in the external scope is the same as
3843 a tag in the file scope. (Primarily relevant to Objective-C
3844 and its builtin structure tags, which get pushed before the
3845 file scope is created.) */
3846 if (B_IN_CURRENT_SCOPE (b)
3847 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
3851 if (thislevel_only && !thislevel)
3854 if (TREE_CODE (b->decl) != code)
3856 /* Definition isn't the kind we were looking for. */
3857 pending_invalid_xref = name;
3858 pending_invalid_xref_location = input_location;
3860 /* If in the same binding level as a declaration as a tag
3861 of a different type, this must not be allowed to
3862 shadow that tag, so give the error immediately.
3863 (For example, "struct foo; union foo;" is invalid.) */
3865 pending_xref_error ();
3874 /* Print an error message now
3875 for a recent invalid struct, union or enum cross reference.
3876 We don't print them immediately because they are not invalid
3877 when used in the `struct foo;' construct for shadowing. */
3880 pending_xref_error (void)
3882 if (pending_invalid_xref != 0)
3883 error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag",
3884 pending_invalid_xref);
3885 pending_invalid_xref = 0;
3889 /* Look up NAME in the current scope and its superiors
3890 in the namespace of variables, functions and typedefs.
3891 Return a ..._DECL node of some kind representing its definition,
3892 or return 0 if it is undefined. */
3895 lookup_name (tree name)
3897 struct c_binding *b = I_SYMBOL_BINDING (name);
3898 if (b && !b->invisible)
3900 maybe_record_typedef_use (b->decl);
3906 /* Similar to `lookup_name' but look only at the indicated scope. */
3909 lookup_name_in_scope (tree name, struct c_scope *scope)
3911 struct c_binding *b;
3913 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
3914 if (B_IN_SCOPE (b, scope))
3919 /* Create the predefined scalar types of C,
3920 and some nodes representing standard constants (0, 1, (void *) 0).
3921 Initialize the global scope.
3922 Make definitions for built-in primitive functions. */
3925 c_init_decl_processing (void)
3927 location_t save_loc = input_location;
3929 /* Initialize reserved words for parser. */
3932 current_function_decl = 0;
3934 gcc_obstack_init (&parser_obstack);
3936 /* Make the externals scope. */
3938 external_scope = current_scope;
3940 /* Declarations from c_common_nodes_and_builtins must not be associated
3941 with this input file, lest we get differences between using and not
3942 using preprocessed headers. */
3943 input_location = BUILTINS_LOCATION;
3945 c_common_nodes_and_builtins ();
3947 /* In C, comparisons and TRUTH_* expressions have type int. */
3948 truthvalue_type_node = integer_type_node;
3949 truthvalue_true_node = integer_one_node;
3950 truthvalue_false_node = integer_zero_node;
3952 /* Even in C99, which has a real boolean type. */
3953 pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"),
3954 boolean_type_node));
3956 input_location = save_loc;
3958 make_fname_decl = c_make_fname_decl;
3959 start_fname_decls ();
3962 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3963 give the decl, NAME is the initialization string and TYPE_DEP
3964 indicates whether NAME depended on the type of the function. As we
3965 don't yet implement delayed emission of static data, we mark the
3966 decl as emitted so it is not placed in the output. Anything using
3967 it must therefore pull out the STRING_CST initializer directly.
3971 c_make_fname_decl (location_t loc, tree id, int type_dep)
3973 const char *name = fname_as_string (type_dep);
3974 tree decl, type, init;
3975 size_t length = strlen (name);
3977 type = build_array_type (char_type_node,
3978 build_index_type (size_int (length)));
3979 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
3981 decl = build_decl (loc, VAR_DECL, id, type);
3983 TREE_STATIC (decl) = 1;
3984 TREE_READONLY (decl) = 1;
3985 DECL_ARTIFICIAL (decl) = 1;
3987 init = build_string (length + 1, name);
3988 free (CONST_CAST (char *, name));
3989 TREE_TYPE (init) = type;
3990 DECL_INITIAL (decl) = init;
3992 TREE_USED (decl) = 1;
3994 if (current_function_decl
3995 /* For invalid programs like this:
3998 const char* p = __FUNCTION__;
4000 the __FUNCTION__ is believed to appear in K&R style function
4001 parameter declarator. In that case we still don't have
4003 && (!seen_error () || current_function_scope))
4005 DECL_CONTEXT (decl) = current_function_decl;
4006 bind (id, decl, current_function_scope,
4007 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
4010 finish_decl (decl, loc, init, NULL_TREE, NULL_TREE);
4016 c_builtin_function (tree decl)
4018 tree type = TREE_TYPE (decl);
4019 tree id = DECL_NAME (decl);
4021 const char *name = IDENTIFIER_POINTER (id);
4022 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
4024 /* Should never be called on a symbol with a preexisting meaning. */
4025 gcc_assert (!I_SYMBOL_BINDING (id));
4027 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false,
4030 /* Builtins in the implementation namespace are made visible without
4031 needing to be explicitly declared. See push_file_scope. */
4032 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
4034 DECL_CHAIN (decl) = visible_builtins;
4035 visible_builtins = decl;
4042 c_builtin_function_ext_scope (tree decl)
4044 tree type = TREE_TYPE (decl);
4045 tree id = DECL_NAME (decl);
4047 const char *name = IDENTIFIER_POINTER (id);
4048 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
4051 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false,
4054 /* Builtins in the implementation namespace are made visible without
4055 needing to be explicitly declared. See push_file_scope. */
4056 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
4058 DECL_CHAIN (decl) = visible_builtins;
4059 visible_builtins = decl;
4065 /* Called when a declaration is seen that contains no names to declare.
4066 If its type is a reference to a structure, union or enum inherited
4067 from a containing scope, shadow that tag name for the current scope
4068 with a forward reference.
4069 If its type defines a new named structure or union
4070 or defines an enum, it is valid but we need not do anything here.
4071 Otherwise, it is an error. */
4074 shadow_tag (const struct c_declspecs *declspecs)
4076 shadow_tag_warned (declspecs, 0);
4079 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
4082 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
4084 bool found_tag = false;
4086 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
4088 tree value = declspecs->type;
4089 enum tree_code code = TREE_CODE (value);
4091 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
4092 /* Used to test also that TYPE_SIZE (value) != 0.
4093 That caused warning for `struct foo;' at top level in the file. */
4095 tree name = TYPE_NAME (value);
4100 if (declspecs->restrict_p)
4102 error ("invalid use of %<restrict%>");
4108 if (warned != 1 && code != ENUMERAL_TYPE)
4109 /* Empty unnamed enum OK */
4111 pedwarn (input_location, 0,
4112 "unnamed struct/union that defines no instances");
4116 else if (declspecs->typespec_kind != ctsk_tagdef
4117 && declspecs->typespec_kind != ctsk_tagfirstref
4118 && declspecs->storage_class != csc_none)
4121 pedwarn (input_location, 0,
4122 "empty declaration with storage class specifier "
4123 "does not redeclare tag");
4125 pending_xref_error ();
4127 else if (declspecs->typespec_kind != ctsk_tagdef
4128 && declspecs->typespec_kind != ctsk_tagfirstref
4129 && (declspecs->const_p
4130 || declspecs->volatile_p
4131 || declspecs->atomic_p
4132 || declspecs->restrict_p
4133 || declspecs->address_space))
4136 pedwarn (input_location, 0,
4137 "empty declaration with type qualifier "
4138 "does not redeclare tag");
4140 pending_xref_error ();
4142 else if (declspecs->typespec_kind != ctsk_tagdef
4143 && declspecs->typespec_kind != ctsk_tagfirstref
4144 && declspecs->alignas_p)
4147 pedwarn (input_location, 0,
4148 "empty declaration with %<_Alignas%> "
4149 "does not redeclare tag");
4151 pending_xref_error ();
4155 pending_invalid_xref = 0;
4156 t = lookup_tag (code, name, 1, NULL);
4160 t = make_node (code);
4161 pushtag (input_location, name, t);
4167 if (warned != 1 && !in_system_header_at (input_location))
4169 pedwarn (input_location, 0,
4170 "useless type name in empty declaration");
4175 else if (warned != 1 && !in_system_header_at (input_location)
4176 && declspecs->typedef_p)
4178 pedwarn (input_location, 0, "useless type name in empty declaration");
4182 pending_invalid_xref = 0;
4184 if (declspecs->inline_p)
4186 error ("%<inline%> in empty declaration");
4190 if (declspecs->noreturn_p)
4192 error ("%<_Noreturn%> in empty declaration");
4196 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
4198 error ("%<auto%> in file-scope empty declaration");
4202 if (current_scope == file_scope && declspecs->storage_class == csc_register)
4204 error ("%<register%> in file-scope empty declaration");
4208 if (!warned && !in_system_header_at (input_location)
4209 && declspecs->storage_class != csc_none)
4211 warning (0, "useless storage class specifier in empty declaration");
4215 if (!warned && !in_system_header_at (input_location) && declspecs->thread_p)
4217 warning (0, "useless %qs in empty declaration",
4218 declspecs->thread_gnu_p ? "__thread" : "_Thread_local");
4223 && !in_system_header_at (input_location)
4224 && (declspecs->const_p
4225 || declspecs->volatile_p
4226 || declspecs->atomic_p
4227 || declspecs->restrict_p
4228 || declspecs->address_space))
4230 warning (0, "useless type qualifier in empty declaration");
4234 if (!warned && !in_system_header_at (input_location)
4235 && declspecs->alignas_p)
4237 warning (0, "useless %<_Alignas%> in empty declaration");
4244 pedwarn (input_location, 0, "empty declaration");
4249 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
4250 bits. SPECS represents declaration specifiers that the grammar
4251 only permits to contain type qualifiers and attributes. */
4254 quals_from_declspecs (const struct c_declspecs *specs)
4256 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
4257 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
4258 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0)
4259 | (specs->atomic_p ? TYPE_QUAL_ATOMIC : 0)
4260 | (ENCODE_QUAL_ADDR_SPACE (specs->address_space)));
4261 gcc_assert (!specs->type
4262 && !specs->decl_attr
4263 && specs->typespec_word == cts_none
4264 && specs->storage_class == csc_none
4265 && !specs->typedef_p
4266 && !specs->explicit_signed_p
4267 && !specs->deprecated_p
4269 && !specs->long_long_p
4272 && !specs->unsigned_p
4273 && !specs->complex_p
4275 && !specs->noreturn_p
4276 && !specs->thread_p);
4280 /* Construct an array declarator. LOC is the location of the
4281 beginning of the array (usually the opening brace). EXPR is the
4282 expression inside [], or NULL_TREE. QUALS are the type qualifiers
4283 inside the [] (to be applied to the pointer to which a parameter
4284 array is converted). STATIC_P is true if "static" is inside the
4285 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
4286 VLA of unspecified length which is nevertheless a complete type,
4287 false otherwise. The field for the contained declarator is left to
4288 be filled in by set_array_declarator_inner. */
4290 struct c_declarator *
4291 build_array_declarator (location_t loc,
4292 tree expr, struct c_declspecs *quals, bool static_p,
4295 struct c_declarator *declarator = XOBNEW (&parser_obstack,
4296 struct c_declarator);
4297 declarator->id_loc = loc;
4298 declarator->kind = cdk_array;
4299 declarator->declarator = 0;
4300 declarator->u.array.dimen = expr;
4303 declarator->u.array.attrs = quals->attrs;
4304 declarator->u.array.quals = quals_from_declspecs (quals);
4308 declarator->u.array.attrs = NULL_TREE;
4309 declarator->u.array.quals = 0;
4311 declarator->u.array.static_p = static_p;
4312 declarator->u.array.vla_unspec_p = vla_unspec_p;
4313 if (static_p || quals != NULL)
4314 pedwarn_c90 (loc, OPT_Wpedantic,
4315 "ISO C90 does not support %<static%> or type "
4316 "qualifiers in parameter array declarators");
4318 pedwarn_c90 (loc, OPT_Wpedantic,
4319 "ISO C90 does not support %<[*]%> array declarators");
4322 if (!current_scope->parm_flag)
4325 error_at (loc, "%<[*]%> not allowed in other than "
4326 "function prototype scope");
4327 declarator->u.array.vla_unspec_p = false;
4330 current_scope->had_vla_unspec = true;
4335 /* Set the contained declarator of an array declarator. DECL is the
4336 declarator, as constructed by build_array_declarator; INNER is what
4337 appears on the left of the []. */
4339 struct c_declarator *
4340 set_array_declarator_inner (struct c_declarator *decl,
4341 struct c_declarator *inner)
4343 decl->declarator = inner;
4347 /* INIT is a constructor that forms DECL's initializer. If the final
4348 element initializes a flexible array field, add the size of that
4349 initializer to DECL's size. */
4352 add_flexible_array_elts_to_size (tree decl, tree init)
4356 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init)))
4359 elt = CONSTRUCTOR_ELTS (init)->last ().value;
4360 type = TREE_TYPE (elt);
4361 if (TREE_CODE (type) == ARRAY_TYPE
4362 && TYPE_SIZE (type) == NULL_TREE
4363 && TYPE_DOMAIN (type) != NULL_TREE
4364 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
4366 complete_array_type (&type, elt, false);
4368 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
4369 DECL_SIZE_UNIT (decl)
4370 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
4374 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4375 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4376 before the type name, and set *EXPR_CONST_OPERANDS, if
4377 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4378 appear in a constant expression. */
4381 groktypename (struct c_type_name *type_name, tree *expr,
4382 bool *expr_const_operands)
4385 tree attrs = type_name->specs->attrs;
4387 type_name->specs->attrs = NULL_TREE;
4389 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
4390 false, NULL, &attrs, expr, expr_const_operands,
4393 /* Apply attributes. */
4394 decl_attributes (&type, attrs, 0);
4399 /* Wrapper for decl_attributes that adds some implicit attributes
4400 to VAR_DECLs or FUNCTION_DECLs. */
4403 c_decl_attributes (tree *node, tree attributes, int flags)
4405 /* Add implicit "omp declare target" attribute if requested. */
4406 if (current_omp_declare_target_attribute
4407 && ((TREE_CODE (*node) == VAR_DECL
4408 && (TREE_STATIC (*node) || DECL_EXTERNAL (*node)))
4409 || TREE_CODE (*node) == FUNCTION_DECL))
4411 if (TREE_CODE (*node) == VAR_DECL
4412 && ((DECL_CONTEXT (*node)
4413 && TREE_CODE (DECL_CONTEXT (*node)) == FUNCTION_DECL)
4414 || (current_function_decl && !DECL_EXTERNAL (*node))))
4415 error ("%q+D in block scope inside of declare target directive",
4417 else if (TREE_CODE (*node) == VAR_DECL
4418 && !lang_hooks.types.omp_mappable_type (TREE_TYPE (*node)))
4419 error ("%q+D in declare target directive does not have mappable type",
4422 attributes = tree_cons (get_identifier ("omp declare target"),
4423 NULL_TREE, attributes);
4425 return decl_attributes (node, attributes, flags);
4429 /* Decode a declarator in an ordinary declaration or data definition.
4430 This is called as soon as the type information and variable name
4431 have been parsed, before parsing the initializer if any.
4432 Here we create the ..._DECL node, fill in its type,
4433 and put it on the list of decls for the current context.
4434 The ..._DECL node is returned as the value.
4436 Exception: for arrays where the length is not specified,
4437 the type is left null, to be filled in by `finish_decl'.
4439 Function definitions do not come here; they go to start_function
4440 instead. However, external and forward declarations of functions
4441 do go through here. Structure field declarations are done by
4442 grokfield and not through here. */
4445 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
4446 bool initialized, tree attributes)
4450 tree expr = NULL_TREE;
4451 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
4453 /* An object declared as __attribute__((deprecated)) suppresses
4454 warnings of uses of other deprecated items. */
4455 if (lookup_attribute ("deprecated", attributes))
4456 deprecated_state = DEPRECATED_SUPPRESS;
4458 decl = grokdeclarator (declarator, declspecs,
4459 NORMAL, initialized, NULL, &attributes, &expr, NULL,
4461 if (!decl || decl == error_mark_node)
4465 add_stmt (fold_convert (void_type_node, expr));
4467 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
4468 warning (OPT_Wmain, "%q+D is usually a function", decl);
4471 /* Is it valid for this decl to have an initializer at all?
4472 If not, set INITIALIZED to zero, which will indirectly
4473 tell 'finish_decl' to ignore the initializer once it is parsed. */
4474 switch (TREE_CODE (decl))
4477 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
4482 error ("function %qD is initialized like a variable", decl);
4487 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4488 error ("parameter %qD is initialized", decl);
4493 /* Don't allow initializations for incomplete types except for
4494 arrays which might be completed by the initialization. */
4496 /* This can happen if the array size is an undefined macro.
4497 We already gave a warning, so we don't need another one. */
4498 if (TREE_TYPE (decl) == error_mark_node)
4500 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
4502 /* A complete type is ok if size is fixed. */
4504 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
4505 || C_DECL_VARIABLE_SIZE (decl))
4507 error ("variable-sized object may not be initialized");
4511 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
4513 error ("variable %qD has initializer but incomplete type", decl);
4516 else if (C_DECL_VARIABLE_SIZE (decl))
4518 /* Although C99 is unclear about whether incomplete arrays
4519 of VLAs themselves count as VLAs, it does not make
4520 sense to permit them to be initialized given that
4521 ordinary VLAs may not be initialized. */
4522 error ("variable-sized object may not be initialized");
4529 if (current_scope == file_scope)
4530 TREE_STATIC (decl) = 1;
4532 /* Tell 'pushdecl' this is an initialized decl
4533 even though we don't yet have the initializer expression.
4534 Also tell 'finish_decl' it may store the real initializer. */
4535 DECL_INITIAL (decl) = error_mark_node;
4538 /* If this is a function declaration, write a record describing it to the
4539 prototypes file (if requested). */
4541 if (TREE_CODE (decl) == FUNCTION_DECL)
4542 gen_aux_info_record (decl, 0, 0, prototype_p (TREE_TYPE (decl)));
4544 /* ANSI specifies that a tentative definition which is not merged with
4545 a non-tentative definition behaves exactly like a definition with an
4546 initializer equal to zero. (Section 3.7.2)
4548 -fno-common gives strict ANSI behavior, though this tends to break
4549 a large body of code that grew up without this rule.
4551 Thread-local variables are never common, since there's no entrenched
4552 body of code to break, and it allows more efficient variable references
4553 in the presence of dynamic linking. */
4555 if (TREE_CODE (decl) == VAR_DECL
4557 && TREE_PUBLIC (decl)
4558 && !DECL_THREAD_LOCAL_P (decl)
4560 DECL_COMMON (decl) = 1;
4562 /* Set attributes here so if duplicate decl, will have proper attributes. */
4563 c_decl_attributes (&decl, attributes, 0);
4565 /* Handle gnu_inline attribute. */
4566 if (declspecs->inline_p
4567 && !flag_gnu89_inline
4568 && TREE_CODE (decl) == FUNCTION_DECL
4569 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
4570 || current_function_decl))
4572 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
4574 else if (declspecs->storage_class != csc_static)
4575 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
4578 if (TREE_CODE (decl) == FUNCTION_DECL
4579 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
4581 struct c_declarator *ce = declarator;
4583 if (ce->kind == cdk_pointer)
4584 ce = declarator->declarator;
4585 if (ce->kind == cdk_function)
4587 tree args = ce->u.arg_info->parms;
4588 for (; args; args = DECL_CHAIN (args))
4590 tree type = TREE_TYPE (args);
4591 if (type && INTEGRAL_TYPE_P (type)
4592 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4593 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
4598 if (TREE_CODE (decl) == FUNCTION_DECL
4599 && DECL_DECLARED_INLINE_P (decl)
4600 && DECL_UNINLINABLE (decl)
4601 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4602 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
4605 /* C99 6.7.4p3: An inline definition of a function with external
4606 linkage shall not contain a definition of a modifiable object
4607 with static storage duration... */
4608 if (TREE_CODE (decl) == VAR_DECL
4609 && current_scope != file_scope
4610 && TREE_STATIC (decl)
4611 && !TREE_READONLY (decl)
4612 && DECL_DECLARED_INLINE_P (current_function_decl)
4613 && DECL_EXTERNAL (current_function_decl))
4614 record_inline_static (input_location, current_function_decl,
4615 decl, csi_modifiable);
4617 if (c_dialect_objc ()
4618 && (TREE_CODE (decl) == VAR_DECL
4619 || TREE_CODE (decl) == FUNCTION_DECL))
4620 objc_check_global_decl (decl);
4622 /* Add this decl to the current scope.
4623 TEM may equal DECL or it may be a previous decl of the same name. */
4624 tem = pushdecl (decl);
4626 if (initialized && DECL_EXTERNAL (tem))
4628 DECL_EXTERNAL (tem) = 0;
4629 TREE_STATIC (tem) = 1;
4635 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4636 DECL or the non-array element type if DECL is an uninitialized array.
4637 If that type has a const member, diagnose this. */
4640 diagnose_uninitialized_cst_member (tree decl, tree type)
4643 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
4646 if (TREE_CODE (field) != FIELD_DECL)
4648 field_type = strip_array_types (TREE_TYPE (field));
4650 if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST)
4652 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4653 "uninitialized const member in %qT is invalid in C++",
4654 strip_array_types (TREE_TYPE (decl)));
4655 inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field);
4658 if (TREE_CODE (field_type) == RECORD_TYPE
4659 || TREE_CODE (field_type) == UNION_TYPE)
4660 diagnose_uninitialized_cst_member (decl, field_type);
4664 /* Finish processing of a declaration;
4665 install its initial value.
4666 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4667 If the length of an array type is not known before,
4668 it must be determined now, from the initial value, or it is an error.
4670 INIT_LOC is the location of the initial value. */
4673 finish_decl (tree decl, location_t init_loc, tree init,
4674 tree origtype, tree asmspec_tree)
4677 bool was_incomplete = (DECL_SIZE (decl) == 0);
4678 const char *asmspec = 0;
4680 /* If a name was specified, get the string. */
4681 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4682 && DECL_FILE_SCOPE_P (decl))
4683 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4685 asmspec = TREE_STRING_POINTER (asmspec_tree);
4687 if (TREE_CODE (decl) == VAR_DECL
4688 && TREE_STATIC (decl)
4689 && global_bindings_p ())
4690 /* So decl is a global variable. Record the types it uses
4691 so that we can decide later to emit debug info for them. */
4692 record_types_used_by_current_var_decl (decl);
4694 /* If `start_decl' didn't like having an initialization, ignore it now. */
4695 if (init != 0 && DECL_INITIAL (decl) == 0)
4698 /* Don't crash if parm is initialized. */
4699 if (TREE_CODE (decl) == PARM_DECL)
4703 store_init_value (init_loc, decl, init, origtype);
4705 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
4706 || TREE_CODE (decl) == FUNCTION_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);
4781 if (TREE_CODE (decl) == VAR_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 ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4810 && DECL_SIZE (decl) != 0)
4812 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4813 constant_expression_warning (DECL_SIZE (decl));
4816 error ("storage size of %q+D isn%'t constant", decl);
4817 TREE_TYPE (decl) = error_mark_node;
4821 if (TREE_USED (type))
4823 TREE_USED (decl) = 1;
4824 DECL_READ_P (decl) = 1;
4828 /* If this is a function and an assembler name is specified, reset DECL_RTL
4829 so we can give it its new name. Also, update builtin_decl if it
4830 was a normal built-in. */
4831 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4833 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4834 set_builtin_user_assembler_name (decl, asmspec);
4835 set_user_assembler_name (decl, asmspec);
4838 /* If #pragma weak was used, mark the decl weak now. */
4839 maybe_apply_pragma_weak (decl);
4841 /* Output the assembler code and/or RTL code for variables and functions,
4842 unless the type is an undefined structure or union.
4843 If not, it will get done when the type is completed. */
4845 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4847 /* Determine the ELF visibility. */
4848 if (TREE_PUBLIC (decl))
4849 c_determine_visibility (decl);
4851 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4852 if (c_dialect_objc ())
4853 objc_check_decl (decl);
4857 /* If this is not a static variable, issue a warning.
4858 It doesn't make any sense to give an ASMSPEC for an
4859 ordinary, non-register local variable. Historically,
4860 GCC has accepted -- but ignored -- the ASMSPEC in
4862 if (!DECL_FILE_SCOPE_P (decl)
4863 && TREE_CODE (decl) == VAR_DECL
4864 && !C_DECL_REGISTER (decl)
4865 && !TREE_STATIC (decl))
4866 warning (0, "ignoring asm-specifier for non-static local "
4867 "variable %q+D", decl);
4869 set_user_assembler_name (decl, asmspec);
4872 if (DECL_FILE_SCOPE_P (decl))
4874 if (DECL_INITIAL (decl) == NULL_TREE
4875 || DECL_INITIAL (decl) == error_mark_node)
4876 /* Don't output anything
4877 when a tentative file-scope definition is seen.
4878 But at end of compilation, do output code for them. */
4879 DECL_DEFER_OUTPUT (decl) = 1;
4880 if (asmspec && C_DECL_REGISTER (decl))
4881 DECL_HARD_REGISTER (decl) = 1;
4882 rest_of_decl_compilation (decl, true, 0);
4886 /* In conjunction with an ASMSPEC, the `register'
4887 keyword indicates that we should place the variable
4888 in a particular register. */
4889 if (asmspec && C_DECL_REGISTER (decl))
4891 DECL_HARD_REGISTER (decl) = 1;
4892 /* This cannot be done for a structure with volatile
4893 fields, on which DECL_REGISTER will have been
4895 if (!DECL_REGISTER (decl))
4896 error ("cannot put object with volatile field into register");
4899 if (TREE_CODE (decl) != FUNCTION_DECL)
4901 /* If we're building a variable sized type, and we might be
4902 reachable other than via the top of the current binding
4903 level, then create a new BIND_EXPR so that we deallocate
4904 the object at the right time. */
4905 /* Note that DECL_SIZE can be null due to errors. */
4906 if (DECL_SIZE (decl)
4907 && !TREE_CONSTANT (DECL_SIZE (decl))
4908 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
4911 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
4912 TREE_SIDE_EFFECTS (bind) = 1;
4914 BIND_EXPR_BODY (bind) = push_stmt_list ();
4916 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
4922 if (!DECL_FILE_SCOPE_P (decl))
4924 /* Recompute the RTL of a local array now
4925 if it used to be an incomplete type. */
4927 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
4929 /* If we used it already as memory, it must stay in memory. */
4930 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4931 /* If it's still incomplete now, no init will save it. */
4932 if (DECL_SIZE (decl) == 0)
4933 DECL_INITIAL (decl) = 0;
4938 if (TREE_CODE (decl) == TYPE_DECL)
4940 if (!DECL_FILE_SCOPE_P (decl)
4941 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
4942 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
4944 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
4947 /* Install a cleanup (aka destructor) if one was given. */
4948 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
4950 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
4953 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
4954 tree cleanup_decl = lookup_name (cleanup_id);
4956 vec<tree, va_gc> *v;
4958 /* Build "cleanup(&decl)" for the destructor. */
4959 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
4961 v->quick_push (cleanup);
4962 cleanup = c_build_function_call_vec (DECL_SOURCE_LOCATION (decl),
4963 vNULL, cleanup_decl, v, NULL);
4966 /* Don't warn about decl unused; the cleanup uses it. */
4967 TREE_USED (decl) = 1;
4968 TREE_USED (cleanup_decl) = 1;
4969 DECL_READ_P (decl) = 1;
4971 push_cleanup (decl, cleanup, false);
4976 && TREE_CODE (decl) == VAR_DECL
4977 && !DECL_EXTERNAL (decl)
4978 && DECL_INITIAL (decl) == NULL_TREE)
4980 type = strip_array_types (type);
4981 if (TREE_READONLY (decl))
4982 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4983 "uninitialized const %qD is invalid in C++", decl);
4984 else if ((TREE_CODE (type) == RECORD_TYPE
4985 || TREE_CODE (type) == UNION_TYPE)
4986 && C_TYPE_FIELDS_READONLY (type))
4987 diagnose_uninitialized_cst_member (decl, type);
4990 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
4993 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4994 EXPR is NULL or a pointer to an expression that needs to be
4995 evaluated for the side effects of array size expressions in the
4999 grokparm (const struct c_parm *parm, tree *expr)
5001 tree attrs = parm->attrs;
5002 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
5003 NULL, &attrs, expr, NULL, DEPRECATED_NORMAL);
5005 decl_attributes (&decl, attrs, 0);
5010 /* Given a parsed parameter declaration, decode it into a PARM_DECL
5011 and push that on the current scope. EXPR is a pointer to an
5012 expression that needs to be evaluated for the side effects of array
5013 size expressions in the parameters. */
5016 push_parm_decl (const struct c_parm *parm, tree *expr)
5018 tree attrs = parm->attrs;
5021 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
5022 &attrs, expr, NULL, DEPRECATED_NORMAL);
5023 decl_attributes (&decl, attrs, 0);
5025 decl = pushdecl (decl);
5027 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
5030 /* Mark all the parameter declarations to date as forward decls.
5031 Also diagnose use of this extension. */
5034 mark_forward_parm_decls (void)
5036 struct c_binding *b;
5038 if (pedantic && !current_scope->warned_forward_parm_decls)
5040 pedwarn (input_location, OPT_Wpedantic,
5041 "ISO C forbids forward parameter declarations");
5042 current_scope->warned_forward_parm_decls = true;
5045 for (b = current_scope->bindings; b; b = b->prev)
5046 if (TREE_CODE (b->decl) == PARM_DECL)
5047 TREE_ASM_WRITTEN (b->decl) = 1;
5050 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5051 literal, which may be an incomplete array type completed by the
5052 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5053 literal. NON_CONST is true if the initializers contain something
5054 that cannot occur in a constant expression. */
5057 build_compound_literal (location_t loc, tree type, tree init, bool non_const)
5059 /* We do not use start_decl here because we have a type, not a declarator;
5060 and do not use finish_decl because the decl should be stored inside
5061 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5066 if (type == error_mark_node
5067 || init == error_mark_node)
5068 return error_mark_node;
5070 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
5071 DECL_EXTERNAL (decl) = 0;
5072 TREE_PUBLIC (decl) = 0;
5073 TREE_STATIC (decl) = (current_scope == file_scope);
5074 DECL_CONTEXT (decl) = current_function_decl;
5075 TREE_USED (decl) = 1;
5076 DECL_READ_P (decl) = 1;
5077 TREE_TYPE (decl) = type;
5078 TREE_READONLY (decl) = (TYPE_READONLY (type)
5079 || (TREE_CODE (type) == ARRAY_TYPE
5080 && TYPE_READONLY (TREE_TYPE (type))));
5081 store_init_value (loc, decl, init, NULL_TREE);
5083 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
5085 int failure = complete_array_type (&TREE_TYPE (decl),
5086 DECL_INITIAL (decl), true);
5087 /* If complete_array_type returns 3, it means that the
5088 initial value of the compound literal is empty. Allow it. */
5089 gcc_assert (failure == 0 || failure == 3);
5091 type = TREE_TYPE (decl);
5092 TREE_TYPE (DECL_INITIAL (decl)) = type;
5095 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
5097 c_incomplete_type_error (NULL_TREE, type);
5098 return error_mark_node;
5101 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
5102 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
5103 TREE_SIDE_EFFECTS (complit) = 1;
5105 layout_decl (decl, 0);
5107 if (TREE_STATIC (decl))
5109 /* This decl needs a name for the assembler output. */
5110 set_compound_literal_name (decl);
5111 DECL_DEFER_OUTPUT (decl) = 1;
5112 DECL_COMDAT (decl) = 1;
5113 DECL_ARTIFICIAL (decl) = 1;
5114 DECL_IGNORED_P (decl) = 1;
5116 rest_of_decl_compilation (decl, 1, 0);
5121 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
5122 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
5128 /* Check the type of a compound literal. Here we just check that it
5129 is valid for C++. */
5132 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
5135 && (type_name->specs->typespec_kind == ctsk_tagdef
5136 || type_name->specs->typespec_kind == ctsk_tagfirstref))
5137 warning_at (loc, OPT_Wc___compat,
5138 "defining a type in a compound literal is invalid in C++");
5141 /* Determine whether TYPE is a structure with a flexible array member,
5142 or a union containing such a structure (possibly recursively). */
5145 flexible_array_type_p (tree type)
5148 switch (TREE_CODE (type))
5151 x = TYPE_FIELDS (type);
5154 while (DECL_CHAIN (x) != NULL_TREE)
5156 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5157 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5158 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5159 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5163 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x))
5165 if (flexible_array_type_p (TREE_TYPE (x)))
5174 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
5175 replacing with appropriate values if they are invalid. */
5177 check_bitfield_type_and_width (tree *type, tree *width, tree orig_name)
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 ("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 (input_location, OPT_Wpedantic,
5200 "bit-field %qs width not an integer constant expression",
5203 if (TREE_CODE (*width) != INTEGER_CST)
5205 error ("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 ("negative width in bit-field %qs", name);
5212 *width = integer_one_node;
5214 else if (integer_zerop (*width) && orig_name)
5216 error ("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 ("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 (input_location, 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 ("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 (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 (&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 ("bit-field %qE has atomic type", name);
6256 error ("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 && TREE_CODE (global_decl) == VAR_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 && (TREE_CODE (decl) == VAR_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));
6750 && TREE_CODE (decl) == VAR_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 static bool explained_incomplete_types = false;
6921 bool gave_void_only_once_err = false;
6923 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
6925 /* The bindings in this scope must not get put into a block.
6926 We will take care of deleting the binding nodes. */
6927 current_scope->bindings = 0;
6929 /* This function is only called if there was *something* on the
6933 /* A parameter list consisting solely of 'void' indicates that the
6934 function takes no arguments. But if the 'void' is qualified
6935 (by 'const' or 'volatile'), or has a storage class specifier
6936 ('register'), then the behavior is undefined; issue an error.
6937 Typedefs for 'void' are OK (see DR#157). */
6938 if (b->prev == 0 /* one binding */
6939 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
6940 && !DECL_NAME (b->decl) /* anonymous */
6941 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
6943 if (TYPE_QUALS (TREE_TYPE (b->decl)) != TYPE_UNQUALIFIED
6944 || C_DECL_REGISTER (b->decl))
6945 error ("%<void%> as only parameter may not be qualified");
6947 /* There cannot be an ellipsis. */
6949 error ("%<void%> must be the only parameter");
6951 arg_info->types = void_list_node;
6956 types = void_list_node;
6958 /* Break up the bindings list into parms, tags, types, and others;
6959 apply sanity checks; purge the name-to-decl bindings. */
6962 tree decl = b->decl;
6963 tree type = TREE_TYPE (decl);
6965 const char *keyword;
6967 switch (TREE_CODE (decl))
6972 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6973 I_SYMBOL_BINDING (b->id) = b->shadowed;
6976 /* Check for forward decls that never got their actual decl. */
6977 if (TREE_ASM_WRITTEN (decl))
6978 error ("parameter %q+D has just a forward declaration", decl);
6979 /* Check for (..., void, ...) and issue an error. */
6980 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
6982 if (!gave_void_only_once_err)
6984 error ("%<void%> must be the only parameter");
6985 gave_void_only_once_err = true;
6990 /* Valid parameter, add it to the list. */
6991 DECL_CHAIN (decl) = parms;
6994 /* Since there is a prototype, args are passed in their
6995 declared types. The back end may override this later. */
6996 DECL_ARG_TYPE (decl) = type;
6997 types = tree_cons (0, type, types);
7001 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
7002 case UNION_TYPE: keyword = "union"; goto tag;
7003 case RECORD_TYPE: keyword = "struct"; goto tag;
7005 /* Types may not have tag-names, in which case the type
7006 appears in the bindings list with b->id NULL. */
7009 gcc_assert (I_TAG_BINDING (b->id) == b);
7010 I_TAG_BINDING (b->id) = b->shadowed;
7013 /* Warn about any struct, union or enum tags defined in a
7014 parameter list. The scope of such types is limited to
7015 the parameter list, which is rarely if ever desirable
7016 (it's impossible to call such a function with type-
7017 correct arguments). An anonymous union parm type is
7018 meaningful as a GNU extension, so don't warn for that. */
7019 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
7022 /* The %s will be one of 'struct', 'union', or 'enum'. */
7023 warning (0, "%<%s %E%> declared inside parameter list",
7026 /* The %s will be one of 'struct', 'union', or 'enum'. */
7027 warning (0, "anonymous %s declared inside parameter list",
7030 if (!explained_incomplete_types)
7032 warning (0, "its scope is only this definition or declaration,"
7033 " which is probably not what you want");
7034 explained_incomplete_types = true;
7040 vec_safe_push (tags, tag);
7046 /* CONST_DECLs appear here when we have an embedded enum,
7047 and TYPE_DECLs appear here when we have an embedded struct
7048 or union. No warnings for this - we already warned about the
7049 type itself. FUNCTION_DECLs appear when there is an implicit
7050 function declaration in the parameter list. */
7052 /* When we reinsert this decl in the function body, we need
7053 to reconstruct whether it was marked as nested. */
7054 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7057 DECL_CHAIN (decl) = others;
7062 /* error_mark_node appears here when we have an undeclared
7063 variable. Just throw it away. */
7066 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
7067 I_SYMBOL_BINDING (b->id) = b->shadowed;
7071 /* Other things that might be encountered. */
7078 b = free_binding_and_advance (b);
7081 arg_info->parms = parms;
7082 arg_info->tags = tags;
7083 arg_info->types = types;
7084 arg_info->others = others;
7085 arg_info->pending_sizes = expr;
7089 /* Get the struct, enum or union (CODE says which) with tag NAME.
7090 Define the tag as a forward-reference with location LOC if it is
7091 not defined. Return a c_typespec structure for the type
7095 parser_xref_tag (location_t loc, enum tree_code code, tree name)
7097 struct c_typespec ret;
7101 ret.expr = NULL_TREE;
7102 ret.expr_const_operands = true;
7104 /* If a cross reference is requested, look up the type
7105 already defined for this tag and return it. */
7107 ref = lookup_tag (code, name, 0, &refloc);
7108 /* If this is the right type of tag, return what we found.
7109 (This reference will be shadowed by shadow_tag later if appropriate.)
7110 If this is the wrong type of tag, do not return it. If it was the
7111 wrong type in the same scope, we will have had an error
7112 message already; if in a different scope and declaring
7113 a name, pending_xref_error will give an error message; but if in a
7114 different scope and not declaring a name, this tag should
7115 shadow the previous declaration of a different type of tag, and
7116 this would not work properly if we return the reference found.
7117 (For example, with "struct foo" in an outer scope, "union foo;"
7118 must shadow that tag with a new one of union type.) */
7119 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
7120 if (ref && TREE_CODE (ref) == code)
7122 if (C_TYPE_DEFINED_IN_STRUCT (ref)
7123 && loc != UNKNOWN_LOCATION
7129 warning_at (loc, OPT_Wc___compat,
7130 ("enum type defined in struct or union "
7131 "is not visible in C++"));
7132 inform (refloc, "enum type defined here");
7135 warning_at (loc, OPT_Wc___compat,
7136 ("struct defined in struct or union "
7137 "is not visible in C++"));
7138 inform (refloc, "struct defined here");
7141 warning_at (loc, OPT_Wc___compat,
7142 ("union defined in struct or union "
7143 "is not visible in C++"));
7144 inform (refloc, "union defined here");
7155 /* If no such tag is yet defined, create a forward-reference node
7156 and record it as the "definition".
7157 When a real declaration of this type is found,
7158 the forward-reference will be altered into a real type. */
7160 ref = make_node (code);
7161 if (code == ENUMERAL_TYPE)
7163 /* Give the type a default layout like unsigned int
7164 to avoid crashing if it does not get defined. */
7165 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
7166 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
7167 TYPE_USER_ALIGN (ref) = 0;
7168 TYPE_UNSIGNED (ref) = 1;
7169 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
7170 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
7171 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
7174 pushtag (loc, name, ref);
7180 /* Get the struct, enum or union (CODE says which) with tag NAME.
7181 Define the tag as a forward-reference if it is not defined.
7182 Return a tree for the type. */
7185 xref_tag (enum tree_code code, tree name)
7187 return parser_xref_tag (input_location, code, name).spec;
7190 /* Make sure that the tag NAME is defined *in the current scope*
7191 at least as a forward reference.
7192 LOC is the location of the struct's definition.
7193 CODE says which kind of tag NAME ought to be.
7195 This stores the current value of the file static STRUCT_PARSE_INFO
7196 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
7197 new c_struct_parse_info structure. The old value of
7198 STRUCT_PARSE_INFO is restored in finish_struct. */
7201 start_struct (location_t loc, enum tree_code code, tree name,
7202 struct c_struct_parse_info **enclosing_struct_parse_info)
7204 /* If there is already a tag defined at this scope
7205 (as a forward reference), just return it. */
7207 tree ref = NULL_TREE;
7208 location_t refloc = UNKNOWN_LOCATION;
7210 if (name != NULL_TREE)
7211 ref = lookup_tag (code, name, 1, &refloc);
7212 if (ref && TREE_CODE (ref) == code)
7214 if (TYPE_SIZE (ref))
7216 if (code == UNION_TYPE)
7217 error_at (loc, "redefinition of %<union %E%>", name);
7219 error_at (loc, "redefinition of %<struct %E%>", name);
7220 if (refloc != UNKNOWN_LOCATION)
7221 inform (refloc, "originally defined here");
7222 /* Don't create structures using a name already in use. */
7225 else if (C_TYPE_BEING_DEFINED (ref))
7227 if (code == UNION_TYPE)
7228 error_at (loc, "nested redefinition of %<union %E%>", name);
7230 error_at (loc, "nested redefinition of %<struct %E%>", name);
7231 /* Don't bother to report "originally defined here" for a
7232 nested redefinition; the original definition should be
7234 /* Don't create structures that contain themselves. */
7239 /* Otherwise create a forward-reference just so the tag is in scope. */
7241 if (ref == NULL_TREE || TREE_CODE (ref) != code)
7243 ref = make_node (code);
7244 pushtag (loc, name, ref);
7247 C_TYPE_BEING_DEFINED (ref) = 1;
7248 TYPE_PACKED (ref) = flag_pack_struct;
7250 *enclosing_struct_parse_info = struct_parse_info;
7251 struct_parse_info = XNEW (struct c_struct_parse_info);
7252 struct_parse_info->struct_types.create (0);
7253 struct_parse_info->fields.create (0);
7254 struct_parse_info->typedefs_seen.create (0);
7256 /* FIXME: This will issue a warning for a use of a type defined
7257 within a statement expr used within sizeof, et. al. This is not
7258 terribly serious as C++ doesn't permit statement exprs within
7260 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7261 warning_at (loc, OPT_Wc___compat,
7262 "defining type in %qs expression is invalid in C++",
7265 : (in_typeof ? "typeof" : "alignof")));
7270 /* Process the specs, declarator and width (NULL if omitted)
7271 of a structure component, returning a FIELD_DECL node.
7272 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
7273 DECL_ATTRS is as for grokdeclarator.
7275 LOC is the location of the structure component.
7277 This is done during the parsing of the struct declaration.
7278 The FIELD_DECL nodes are chained together and the lot of them
7279 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
7282 grokfield (location_t loc,
7283 struct c_declarator *declarator, struct c_declspecs *declspecs,
7284 tree width, tree *decl_attrs)
7288 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
7289 && width == NULL_TREE)
7291 /* This is an unnamed decl.
7293 If we have something of the form "union { list } ;" then this
7294 is the anonymous union extension. Similarly for struct.
7296 If this is something of the form "struct foo;", then
7297 If MS or Plan 9 extensions are enabled, this is handled as
7298 an anonymous struct.
7299 Otherwise this is a forward declaration of a structure tag.
7301 If this is something of the form "foo;" and foo is a TYPE_DECL, then
7302 If foo names a structure or union without a tag, then this
7303 is an anonymous struct (this is permitted by C11).
7304 If MS or Plan 9 extensions are enabled and foo names a
7305 structure, then again this is an anonymous struct.
7306 Otherwise this is an error.
7308 Oh what a horrid tangled web we weave. I wonder if MS consciously
7309 took this from Plan 9 or if it was an accident of implementation
7310 that took root before someone noticed the bug... */
7312 tree type = declspecs->type;
7313 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
7314 || TREE_CODE (type) == UNION_TYPE);
7318 && (flag_ms_extensions
7319 || flag_plan9_extensions
7320 || !declspecs->typedef_p))
7322 if (flag_ms_extensions || flag_plan9_extensions)
7324 else if (TYPE_NAME (type) == NULL)
7331 pedwarn (loc, 0, "declaration does not declare anything");
7335 pedwarn_c99 (loc, OPT_Wpedantic,
7336 "ISO C99 doesn%'t support unnamed structs/unions");
7338 pedwarn_c99 (loc, OPT_Wpedantic,
7339 "ISO C90 doesn%'t support unnamed structs/unions");
7342 value = grokdeclarator (declarator, declspecs, FIELD, false,
7343 width ? &width : NULL, decl_attrs, NULL, NULL,
7346 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
7347 DECL_INITIAL (value) = width;
7349 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
7351 /* If we currently have a binding for this field, set the
7352 in_struct field in the binding, so that we warn about lookups
7354 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
7357 /* If the in_struct field is not yet set, push it on a list
7358 to be cleared when this struct is finished. */
7361 struct_parse_info->fields.safe_push (b);
7370 /* Subroutine of detect_field_duplicates: return whether X and Y,
7371 which are both fields in the same struct, have duplicate field
7375 is_duplicate_field (tree x, tree y)
7377 if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y))
7380 /* When using -fplan9-extensions, an anonymous field whose name is a
7381 typedef can duplicate a field name. */
7382 if (flag_plan9_extensions
7383 && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE))
7385 tree xt, xn, yt, yn;
7388 if (DECL_NAME (x) != NULL_TREE)
7390 else if ((TREE_CODE (xt) == RECORD_TYPE || TREE_CODE (xt) == UNION_TYPE)
7391 && TYPE_NAME (xt) != NULL_TREE
7392 && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL)
7393 xn = DECL_NAME (TYPE_NAME (xt));
7398 if (DECL_NAME (y) != NULL_TREE)
7400 else if ((TREE_CODE (yt) == RECORD_TYPE || TREE_CODE (yt) == UNION_TYPE)
7401 && TYPE_NAME (yt) != NULL_TREE
7402 && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL)
7403 yn = DECL_NAME (TYPE_NAME (yt));
7407 if (xn != NULL_TREE && xn == yn)
7414 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7415 to HTAB, giving errors for any duplicates. */
7418 detect_field_duplicates_hash (tree fieldlist,
7419 hash_table<pointer_hash <tree_node> > *htab)
7424 for (x = fieldlist; x ; x = DECL_CHAIN (x))
7425 if ((y = DECL_NAME (x)) != 0)
7427 slot = htab->find_slot (y, INSERT);
7430 error ("duplicate member %q+D", x);
7431 DECL_NAME (x) = NULL_TREE;
7435 else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7436 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7438 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab);
7440 /* When using -fplan9-extensions, an anonymous field whose
7441 name is a typedef can duplicate a field name. */
7442 if (flag_plan9_extensions
7443 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
7444 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)
7446 tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x)));
7447 slot = htab->find_slot (xn, INSERT);
7449 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x)));
7455 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7456 the list such that this does not present a problem later. */
7459 detect_field_duplicates (tree fieldlist)
7464 /* If the struct is the list of instance variables of an Objective-C
7465 class, then we need to check all the instance variables of
7466 superclasses when checking for duplicates (since you can't have
7467 an instance variable in a subclass with the same name as an
7468 instance variable in a superclass). We pass on this job to the
7469 Objective-C compiler. objc_detect_field_duplicates() will return
7470 false if we are not checking the list of instance variables and
7471 the C frontend should proceed with the standard field duplicate
7472 checks. If we are checking the list of instance variables, the
7473 ObjC frontend will do the check, emit the errors if needed, and
7474 then return true. */
7475 if (c_dialect_objc ())
7476 if (objc_detect_field_duplicates (false))
7479 /* First, see if there are more than "a few" fields.
7480 This is trivially true if there are zero or one fields. */
7481 if (!fieldlist || !DECL_CHAIN (fieldlist))
7486 if (DECL_NAME (x) == NULL_TREE
7487 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7488 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7491 } while (timeout > 0 && x);
7493 /* If there were "few" fields and no anonymous structures or unions,
7494 avoid the overhead of allocating a hash table. Instead just do
7495 the nested traversal thing. */
7498 for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x))
7499 /* When using -fplan9-extensions, we can have duplicates
7500 between typedef names and fields. */
7502 || (flag_plan9_extensions
7503 && DECL_NAME (x) == NULL_TREE
7504 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7505 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7506 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
7507 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL))
7509 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
7510 if (is_duplicate_field (y, x))
7512 error ("duplicate member %q+D", x);
7513 DECL_NAME (x) = NULL_TREE;
7519 hash_table<pointer_hash <tree_node> > htab (37);
7520 detect_field_duplicates_hash (fieldlist, &htab);
7524 /* Finish up struct info used by -Wc++-compat. */
7527 warn_cxx_compat_finish_struct (tree fieldlist)
7531 struct c_binding *b;
7533 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7534 the current struct. We do this now at the end of the struct
7535 because the flag is used to issue visibility warnings, and we
7536 only want to issue those warnings if the type is referenced
7537 outside of the struct declaration. */
7538 FOR_EACH_VEC_ELT (struct_parse_info->struct_types, ix, x)
7539 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
7541 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7542 typedefs used when declaring fields in this struct. If the name
7543 of any of the fields is also a typedef name then the struct would
7544 not parse in C++, because the C++ lookup rules say that the
7545 typedef name would be looked up in the context of the struct, and
7546 would thus be the field rather than the typedef. */
7547 if (!struct_parse_info->typedefs_seen.is_empty ()
7548 && fieldlist != NULL_TREE)
7550 /* Use a hash_set<tree> using the name of the typedef. We can use
7551 a hash_set<tree> because identifiers are interned. */
7552 hash_set<tree> tset;
7554 FOR_EACH_VEC_ELT (struct_parse_info->typedefs_seen, ix, x)
7555 tset.add (DECL_NAME (x));
7557 for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x))
7559 if (DECL_NAME (x) != NULL_TREE
7560 && tset.contains (DECL_NAME (x)))
7562 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
7563 ("using %qD as both field and typedef name is "
7566 /* FIXME: It would be nice to report the location where
7567 the typedef name is used. */
7572 /* For each field which has a binding and which was not defined in
7573 an enclosing struct, clear the in_struct field. */
7574 FOR_EACH_VEC_ELT (struct_parse_info->fields, ix, b)
7578 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7579 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7580 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7581 ATTRIBUTES are attributes to be applied to the structure.
7583 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7584 the struct was started. */
7587 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
7588 struct c_struct_parse_info *enclosing_struct_parse_info)
7591 bool toplevel = file_scope == current_scope;
7592 int saw_named_field;
7594 /* If this type was previously laid out as a forward reference,
7595 make sure we lay it out again. */
7599 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7603 for (x = fieldlist; x; x = DECL_CHAIN (x))
7605 if (DECL_NAME (x) != 0)
7608 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7609 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7615 if (TREE_CODE (t) == UNION_TYPE)
7618 pedwarn (loc, OPT_Wpedantic, "union has no named members");
7620 pedwarn (loc, OPT_Wpedantic, "union has no members");
7625 pedwarn (loc, OPT_Wpedantic, "struct has no named members");
7627 pedwarn (loc, OPT_Wpedantic, "struct has no members");
7632 /* Install struct as DECL_CONTEXT of each field decl.
7633 Also process specified field sizes, found in the DECL_INITIAL,
7634 storing 0 there after the type has been changed to precision equal
7635 to its width, rather than the precision of the specified standard
7636 type. (Correct layout requires the original type to have been preserved
7639 saw_named_field = 0;
7640 for (x = fieldlist; x; x = DECL_CHAIN (x))
7642 if (TREE_TYPE (x) == error_mark_node)
7645 DECL_CONTEXT (x) = t;
7647 /* If any field is const, the structure type is pseudo-const. */
7648 if (TREE_READONLY (x))
7649 C_TYPE_FIELDS_READONLY (t) = 1;
7652 /* A field that is pseudo-const makes the structure likewise. */
7653 tree t1 = strip_array_types (TREE_TYPE (x));
7654 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
7655 && C_TYPE_FIELDS_READONLY (t1))
7656 C_TYPE_FIELDS_READONLY (t) = 1;
7659 /* Any field that is volatile means variables of this type must be
7660 treated in some ways as volatile. */
7661 if (TREE_THIS_VOLATILE (x))
7662 C_TYPE_FIELDS_VOLATILE (t) = 1;
7664 /* Any field of nominal variable size implies structure is too. */
7665 if (C_DECL_VARIABLE_SIZE (x))
7666 C_TYPE_VARIABLE_SIZE (t) = 1;
7668 if (DECL_INITIAL (x))
7670 unsigned HOST_WIDE_INT width = tree_to_uhwi (DECL_INITIAL (x));
7671 DECL_SIZE (x) = bitsize_int (width);
7672 DECL_BIT_FIELD (x) = 1;
7673 SET_DECL_C_BIT_FIELD (x);
7677 && (DECL_BIT_FIELD (x)
7678 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
7679 DECL_PACKED (x) = 1;
7681 /* Detect flexible array member in an invalid context. */
7682 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
7683 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
7684 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
7685 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
7687 if (TREE_CODE (t) == UNION_TYPE)
7689 error_at (DECL_SOURCE_LOCATION (x),
7690 "flexible array member in union");
7691 TREE_TYPE (x) = error_mark_node;
7693 else if (DECL_CHAIN (x) != NULL_TREE)
7695 error_at (DECL_SOURCE_LOCATION (x),
7696 "flexible array member not at end of struct");
7697 TREE_TYPE (x) = error_mark_node;
7699 else if (!saw_named_field)
7701 error_at (DECL_SOURCE_LOCATION (x),
7702 "flexible array member in otherwise empty struct");
7703 TREE_TYPE (x) = error_mark_node;
7707 if (pedantic && TREE_CODE (t) == RECORD_TYPE
7708 && flexible_array_type_p (TREE_TYPE (x)))
7709 pedwarn (DECL_SOURCE_LOCATION (x), OPT_Wpedantic,
7710 "invalid use of structure with flexible array member");
7713 || TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7714 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7715 saw_named_field = 1;
7718 detect_field_duplicates (fieldlist);
7720 /* Now we have the nearly final fieldlist. Record it,
7721 then lay out the structure or union (including the fields). */
7723 TYPE_FIELDS (t) = fieldlist;
7727 if (TYPE_SIZE_UNIT (t)
7728 && TREE_CODE (TYPE_SIZE_UNIT (t)) == INTEGER_CST
7729 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t))
7730 && !valid_constant_size_p (TYPE_SIZE_UNIT (t)))
7731 error ("type %qT is too large", t);
7733 /* Give bit-fields their proper types. */
7735 tree *fieldlistp = &fieldlist;
7737 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
7738 && TREE_TYPE (*fieldlistp) != error_mark_node)
7740 unsigned HOST_WIDE_INT width
7741 = tree_to_uhwi (DECL_INITIAL (*fieldlistp));
7742 tree type = TREE_TYPE (*fieldlistp);
7743 if (width != TYPE_PRECISION (type))
7745 TREE_TYPE (*fieldlistp)
7746 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
7747 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
7749 DECL_INITIAL (*fieldlistp) = 0;
7752 fieldlistp = &DECL_CHAIN (*fieldlistp);
7755 /* Now we have the truly final field list.
7756 Store it in this type and in the variants. */
7758 TYPE_FIELDS (t) = fieldlist;
7760 /* If there are lots of fields, sort so we can look through them fast.
7761 We arbitrarily consider 16 or more elts to be "a lot". */
7766 for (x = fieldlist; x; x = DECL_CHAIN (x))
7768 if (len > 15 || DECL_NAME (x) == NULL)
7776 struct lang_type *space;
7777 struct sorted_fields_type *space2;
7779 len += list_length (x);
7781 /* Use the same allocation policy here that make_node uses, to
7782 ensure that this lives as long as the rest of the struct decl.
7783 All decls in an inline function need to be saved. */
7785 space = ggc_cleared_alloc<struct lang_type> ();
7786 space2 = (sorted_fields_type *) ggc_internal_alloc
7787 (sizeof (struct sorted_fields_type) + len * sizeof (tree));
7791 field_array = &space2->elts[0];
7792 for (x = fieldlist; x; x = DECL_CHAIN (x))
7794 field_array[len++] = x;
7796 /* If there is anonymous struct or union, break out of the loop. */
7797 if (DECL_NAME (x) == NULL)
7800 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7803 TYPE_LANG_SPECIFIC (t) = space;
7804 TYPE_LANG_SPECIFIC (t)->s->len = len;
7805 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
7806 qsort (field_array, len, sizeof (tree), field_decl_cmp);
7811 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
7813 TYPE_FIELDS (x) = TYPE_FIELDS (t);
7814 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
7815 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
7816 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
7817 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
7820 /* If this was supposed to be a transparent union, but we can't
7821 make it one, warn and turn off the flag. */
7822 if (TREE_CODE (t) == UNION_TYPE
7823 && TYPE_TRANSPARENT_AGGR (t)
7824 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
7826 TYPE_TRANSPARENT_AGGR (t) = 0;
7827 warning_at (loc, 0, "union cannot be made transparent");
7830 /* If this structure or union completes the type of any previous
7831 variable declaration, lay it out and output its rtl. */
7832 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
7836 tree decl = TREE_VALUE (x);
7837 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
7838 layout_array_type (TREE_TYPE (decl));
7839 if (TREE_CODE (decl) != TYPE_DECL)
7841 layout_decl (decl, 0);
7842 if (c_dialect_objc ())
7843 objc_check_decl (decl);
7844 rest_of_decl_compilation (decl, toplevel, 0);
7847 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
7849 /* Update type location to the one of the definition, instead of e.g.
7850 a forward declaration. */
7851 if (TYPE_STUB_DECL (t))
7852 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
7854 /* Finish debugging output for this type. */
7855 rest_of_type_compilation (t, toplevel);
7857 /* If we're inside a function proper, i.e. not file-scope and not still
7858 parsing parameters, then arrange for the size of a variable sized type
7860 if (building_stmt_list_p () && variably_modified_type_p (t, NULL_TREE))
7861 add_stmt (build_stmt (loc,
7862 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
7864 if (warn_cxx_compat)
7865 warn_cxx_compat_finish_struct (fieldlist);
7867 struct_parse_info->struct_types.release ();
7868 struct_parse_info->fields.release ();
7869 struct_parse_info->typedefs_seen.release ();
7870 XDELETE (struct_parse_info);
7872 struct_parse_info = enclosing_struct_parse_info;
7874 /* If this struct is defined inside a struct, add it to
7877 && struct_parse_info != NULL
7878 && !in_sizeof && !in_typeof && !in_alignof)
7879 struct_parse_info->struct_types.safe_push (t);
7884 /* Lay out the type T, and its element type, and so on. */
7887 layout_array_type (tree t)
7889 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
7890 layout_array_type (TREE_TYPE (t));
7894 /* Begin compiling the definition of an enumeration type.
7895 NAME is its name (or null if anonymous).
7896 LOC is the enum's location.
7897 Returns the type object, as yet incomplete.
7898 Also records info about it so that build_enumerator
7899 may be used to declare the individual values as they are read. */
7902 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
7904 tree enumtype = NULL_TREE;
7905 location_t enumloc = UNKNOWN_LOCATION;
7907 /* If this is the real definition for a previous forward reference,
7908 fill in the contents in the same object that used to be the
7909 forward reference. */
7911 if (name != NULL_TREE)
7912 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc);
7914 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
7916 enumtype = make_node (ENUMERAL_TYPE);
7917 pushtag (loc, name, enumtype);
7920 if (C_TYPE_BEING_DEFINED (enumtype))
7921 error_at (loc, "nested redefinition of %<enum %E%>", name);
7923 C_TYPE_BEING_DEFINED (enumtype) = 1;
7925 if (TYPE_VALUES (enumtype) != 0)
7927 /* This enum is a named one that has been declared already. */
7928 error_at (loc, "redeclaration of %<enum %E%>", name);
7929 if (enumloc != UNKNOWN_LOCATION)
7930 inform (enumloc, "originally defined here");
7932 /* Completely replace its old definition.
7933 The old enumerators remain defined, however. */
7934 TYPE_VALUES (enumtype) = 0;
7937 the_enum->enum_next_value = integer_zero_node;
7938 the_enum->enum_overflow = 0;
7940 if (flag_short_enums)
7941 TYPE_PACKED (enumtype) = 1;
7943 /* FIXME: This will issue a warning for a use of a type defined
7944 within sizeof in a statement expr. This is not terribly serious
7945 as C++ doesn't permit statement exprs within sizeof anyhow. */
7946 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7947 warning_at (loc, OPT_Wc___compat,
7948 "defining type in %qs expression is invalid in C++",
7951 : (in_typeof ? "typeof" : "alignof")));
7956 /* After processing and defining all the values of an enumeration type,
7957 install their decls in the enumeration type and finish it off.
7958 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7959 and ATTRIBUTES are the specified attributes.
7960 Returns ENUMTYPE. */
7963 finish_enum (tree enumtype, tree values, tree attributes)
7966 tree minnode = 0, maxnode = 0;
7969 bool toplevel = (file_scope == current_scope);
7970 struct lang_type *lt;
7972 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7974 /* Calculate the maximum value of any enumerator in this type. */
7976 if (values == error_mark_node)
7977 minnode = maxnode = integer_zero_node;
7980 minnode = maxnode = TREE_VALUE (values);
7981 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
7983 tree value = TREE_VALUE (pair);
7984 if (tree_int_cst_lt (maxnode, value))
7986 if (tree_int_cst_lt (value, minnode))
7991 /* Construct the final type of this enumeration. It is the same
7992 as one of the integral types - the narrowest one that fits, except
7993 that normally we only go as narrow as int - and signed iff any of
7994 the values are negative. */
7995 sign = (tree_int_cst_sgn (minnode) >= 0) ? UNSIGNED : SIGNED;
7996 precision = MAX (tree_int_cst_min_precision (minnode, sign),
7997 tree_int_cst_min_precision (maxnode, sign));
7999 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
8001 tem = c_common_type_for_size (precision, sign == UNSIGNED ? 1 : 0);
8004 warning (0, "enumeration values exceed range of largest integer");
8005 tem = long_long_integer_type_node;
8009 tem = sign == UNSIGNED ? unsigned_type_node : integer_type_node;
8011 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
8012 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
8013 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
8014 TYPE_SIZE (enumtype) = 0;
8016 /* If the precision of the type was specific with an attribute and it
8017 was too small, give an error. Otherwise, use it. */
8018 if (TYPE_PRECISION (enumtype))
8020 if (precision > TYPE_PRECISION (enumtype))
8021 error ("specified mode too small for enumeral values");
8024 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
8026 layout_type (enumtype);
8028 if (values != error_mark_node)
8030 /* Change the type of the enumerators to be the enum type. We
8031 need to do this irrespective of the size of the enum, for
8032 proper type checking. Replace the DECL_INITIALs of the
8033 enumerators, and the value slots of the list, with copies
8034 that have the enum type; they cannot be modified in place
8035 because they may be shared (e.g. integer_zero_node) Finally,
8036 change the purpose slots to point to the names of the decls. */
8037 for (pair = values; pair; pair = TREE_CHAIN (pair))
8039 tree enu = TREE_PURPOSE (pair);
8040 tree ini = DECL_INITIAL (enu);
8042 TREE_TYPE (enu) = enumtype;
8044 /* The ISO C Standard mandates enumerators to have type int,
8045 even though the underlying type of an enum type is
8046 unspecified. However, GCC allows enumerators of any
8047 integer type as an extensions. build_enumerator()
8048 converts any enumerators that fit in an int to type int,
8049 to avoid promotions to unsigned types when comparing
8050 integers with enumerators that fit in the int range.
8051 When -pedantic is given, build_enumerator() would have
8052 already warned about those that don't fit. Here we
8053 convert the rest to the enumerator type. */
8054 if (TREE_TYPE (ini) != integer_type_node)
8055 ini = convert (enumtype, ini);
8057 DECL_INITIAL (enu) = ini;
8058 TREE_PURPOSE (pair) = DECL_NAME (enu);
8059 TREE_VALUE (pair) = ini;
8062 TYPE_VALUES (enumtype) = values;
8065 /* Record the min/max values so that we can warn about bit-field
8066 enumerations that are too small for the values. */
8067 lt = ggc_cleared_alloc<struct lang_type> ();
8068 lt->enum_min = minnode;
8069 lt->enum_max = maxnode;
8070 TYPE_LANG_SPECIFIC (enumtype) = lt;
8072 /* Fix up all variant types of this enum type. */
8073 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
8075 if (tem == enumtype)
8077 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
8078 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
8079 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
8080 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
8081 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
8082 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
8083 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
8084 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
8085 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
8086 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
8087 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
8090 /* Finish debugging output for this type. */
8091 rest_of_type_compilation (enumtype, toplevel);
8093 /* If this enum is defined inside a struct, add it to
8096 && struct_parse_info != NULL
8097 && !in_sizeof && !in_typeof && !in_alignof)
8098 struct_parse_info->struct_types.safe_push (enumtype);
8103 /* Build and install a CONST_DECL for one value of the
8104 current enumeration type (one that was begun with start_enum).
8105 DECL_LOC is the location of the enumerator.
8106 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
8107 Return a tree-list containing the CONST_DECL and its value.
8108 Assignment of sequential values by default is handled here. */
8111 build_enumerator (location_t decl_loc, location_t loc,
8112 struct c_enum_contents *the_enum, tree name, tree value)
8116 /* Validate and default VALUE. */
8120 /* Don't issue more errors for error_mark_node (i.e. an
8121 undeclared identifier) - just ignore the value expression. */
8122 if (value == error_mark_node)
8124 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
8126 error_at (loc, "enumerator value for %qE is not an integer constant",
8132 if (TREE_CODE (value) != INTEGER_CST)
8134 value = c_fully_fold (value, false, NULL);
8135 if (TREE_CODE (value) == INTEGER_CST)
8136 pedwarn (loc, OPT_Wpedantic,
8137 "enumerator value for %qE is not an integer "
8138 "constant expression", name);
8140 if (TREE_CODE (value) != INTEGER_CST)
8142 error ("enumerator value for %qE is not an integer constant",
8148 value = default_conversion (value);
8149 constant_expression_warning (value);
8154 /* Default based on previous value. */
8155 /* It should no longer be possible to have NON_LVALUE_EXPR
8159 value = the_enum->enum_next_value;
8160 if (the_enum->enum_overflow)
8161 error_at (loc, "overflow in enumeration values");
8163 /* Even though the underlying type of an enum is unspecified, the
8164 type of enumeration constants is explicitly defined as int
8165 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
8167 else if (!int_fits_type_p (value, integer_type_node))
8168 pedwarn (loc, OPT_Wpedantic,
8169 "ISO C restricts enumerator values to range of %<int%>");
8171 /* The ISO C Standard mandates enumerators to have type int, even
8172 though the underlying type of an enum type is unspecified.
8173 However, GCC allows enumerators of any integer type as an
8174 extensions. Here we convert any enumerators that fit in an int
8175 to type int, to avoid promotions to unsigned types when comparing
8176 integers with enumerators that fit in the int range. When
8177 -pedantic is given, we would have already warned about those that
8178 don't fit. We have to do this here rather than in finish_enum
8179 because this value may be used to define more enumerators. */
8180 if (int_fits_type_p (value, integer_type_node))
8181 value = convert (integer_type_node, value);
8183 /* Set basis for default for next value. */
8184 the_enum->enum_next_value
8185 = build_binary_op (EXPR_LOC_OR_LOC (value, input_location),
8186 PLUS_EXPR, value, integer_one_node, 0);
8187 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
8189 /* Now create a declaration for the enum value name. */
8191 type = TREE_TYPE (value);
8192 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
8193 TYPE_PRECISION (integer_type_node)),
8194 (TYPE_PRECISION (type)
8195 >= TYPE_PRECISION (integer_type_node)
8196 && TYPE_UNSIGNED (type)));
8198 decl = build_decl (decl_loc, CONST_DECL, name, type);
8199 DECL_INITIAL (decl) = convert (type, value);
8202 return tree_cons (decl, value, NULL_TREE);
8206 /* Create the FUNCTION_DECL for a function definition.
8207 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
8208 the declaration; they describe the function's name and the type it returns,
8209 but twisted together in a fashion that parallels the syntax of C.
8211 This function creates a binding context for the function body
8212 as well as setting up the FUNCTION_DECL in current_function_decl.
8214 Returns 1 on success. If the DECLARATOR is not suitable for a function
8215 (it defines a datum instead), we return 0, which tells
8216 yyparse to report a parse error. */
8219 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
8222 tree decl1, old_decl;
8223 tree restype, resdecl;
8226 current_function_returns_value = 0; /* Assume, until we see it does. */
8227 current_function_returns_null = 0;
8228 current_function_returns_abnormally = 0;
8229 warn_about_return_type = 0;
8230 c_switch_stack = NULL;
8232 /* Indicate no valid break/continue context by setting these variables
8233 to some non-null, non-label value. We'll notice and emit the proper
8234 error message in c_finish_bc_stmt. */
8235 c_break_label = c_cont_label = size_zero_node;
8237 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
8238 &attributes, NULL, NULL, DEPRECATED_NORMAL);
8240 /* If the declarator is not suitable for a function definition,
8241 cause a syntax error. */
8243 || TREE_CODE (decl1) != FUNCTION_DECL)
8246 loc = DECL_SOURCE_LOCATION (decl1);
8248 c_decl_attributes (&decl1, attributes, 0);
8250 if (DECL_DECLARED_INLINE_P (decl1)
8251 && DECL_UNINLINABLE (decl1)
8252 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
8253 warning_at (loc, OPT_Wattributes,
8254 "inline function %qD given attribute noinline",
8257 /* Handle gnu_inline attribute. */
8258 if (declspecs->inline_p
8259 && !flag_gnu89_inline
8260 && TREE_CODE (decl1) == FUNCTION_DECL
8261 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
8262 || current_function_decl))
8264 if (declspecs->storage_class != csc_static)
8265 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
8268 announce_function (decl1);
8270 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
8272 error_at (loc, "return type is an incomplete type");
8273 /* Make it return void instead. */
8275 = build_function_type (void_type_node,
8276 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
8279 if (warn_about_return_type)
8280 warn_defaults_to (loc, flag_isoc99 ? OPT_Wimplicit_int
8281 : (warn_return_type ? OPT_Wreturn_type
8282 : OPT_Wimplicit_int),
8283 "return type defaults to %<int%>");
8285 /* Make the init_value nonzero so pushdecl knows this is not tentative.
8286 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
8287 DECL_INITIAL (decl1) = error_mark_node;
8289 /* A nested function is not global. */
8290 if (current_function_decl != 0)
8291 TREE_PUBLIC (decl1) = 0;
8293 /* If this definition isn't a prototype and we had a prototype declaration
8294 before, copy the arg type info from that prototype. */
8295 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
8296 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
8298 current_function_prototype_locus = UNKNOWN_LOCATION;
8299 current_function_prototype_built_in = false;
8300 current_function_prototype_arg_types = NULL_TREE;
8301 if (!prototype_p (TREE_TYPE (decl1)))
8303 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
8304 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
8305 TREE_TYPE (TREE_TYPE (old_decl))))
8307 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
8309 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
8310 current_function_prototype_built_in
8311 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
8312 current_function_prototype_arg_types
8313 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
8315 if (TREE_PUBLIC (decl1))
8317 /* If there is an external prototype declaration of this
8318 function, record its location but do not copy information
8319 to this decl. This may be an invisible declaration
8320 (built-in or in a scope which has finished) or simply
8321 have more refined argument types than any declaration
8323 struct c_binding *b;
8324 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
8325 if (B_IN_SCOPE (b, external_scope))
8329 tree ext_decl, ext_type;
8331 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
8332 if (TREE_CODE (ext_type) == FUNCTION_TYPE
8333 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
8334 TREE_TYPE (ext_type)))
8336 current_function_prototype_locus
8337 = DECL_SOURCE_LOCATION (ext_decl);
8338 current_function_prototype_built_in
8339 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
8340 current_function_prototype_arg_types
8341 = TYPE_ARG_TYPES (ext_type);
8347 /* Optionally warn of old-fashioned def with no previous prototype. */
8348 if (warn_strict_prototypes
8349 && old_decl != error_mark_node
8350 && !prototype_p (TREE_TYPE (decl1))
8351 && C_DECL_ISNT_PROTOTYPE (old_decl))
8352 warning_at (loc, OPT_Wstrict_prototypes,
8353 "function declaration isn%'t a prototype");
8354 /* Optionally warn of any global def with no previous prototype. */
8355 else if (warn_missing_prototypes
8356 && old_decl != error_mark_node
8357 && TREE_PUBLIC (decl1)
8358 && !MAIN_NAME_P (DECL_NAME (decl1))
8359 && C_DECL_ISNT_PROTOTYPE (old_decl)
8360 && !DECL_DECLARED_INLINE_P (decl1))
8361 warning_at (loc, OPT_Wmissing_prototypes,
8362 "no previous prototype for %qD", decl1);
8363 /* Optionally warn of any def with no previous prototype
8364 if the function has already been used. */
8365 else if (warn_missing_prototypes
8367 && old_decl != error_mark_node
8368 && TREE_USED (old_decl)
8369 && !prototype_p (TREE_TYPE (old_decl)))
8370 warning_at (loc, OPT_Wmissing_prototypes,
8371 "%qD was used with no prototype before its definition", decl1);
8372 /* Optionally warn of any global def with no previous declaration. */
8373 else if (warn_missing_declarations
8374 && TREE_PUBLIC (decl1)
8376 && !MAIN_NAME_P (DECL_NAME (decl1))
8377 && !DECL_DECLARED_INLINE_P (decl1))
8378 warning_at (loc, OPT_Wmissing_declarations,
8379 "no previous declaration for %qD",
8381 /* Optionally warn of any def with no previous declaration
8382 if the function has already been used. */
8383 else if (warn_missing_declarations
8385 && old_decl != error_mark_node
8386 && TREE_USED (old_decl)
8387 && C_DECL_IMPLICIT (old_decl))
8388 warning_at (loc, OPT_Wmissing_declarations,
8389 "%qD was used with no declaration before its definition", decl1);
8391 /* This function exists in static storage.
8392 (This does not mean `static' in the C sense!) */
8393 TREE_STATIC (decl1) = 1;
8395 /* This is the earliest point at which we might know the assembler
8396 name of the function. Thus, if it's set before this, die horribly. */
8397 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
8399 /* If #pragma weak was used, mark the decl weak now. */
8400 if (current_scope == file_scope)
8401 maybe_apply_pragma_weak (decl1);
8403 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8404 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
8406 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
8407 != integer_type_node)
8408 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
8409 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1))))
8410 pedwarn (loc, OPT_Wmain, "%<_Atomic%>-qualified return type of %qD",
8413 check_main_parameter_types (decl1);
8415 if (!TREE_PUBLIC (decl1))
8416 pedwarn (loc, OPT_Wmain,
8417 "%qD is normally a non-static function", decl1);
8420 /* Record the decl so that the function name is defined.
8421 If we already have a decl for this name, and it is a FUNCTION_DECL,
8422 use the old decl. */
8424 current_function_decl = pushdecl (decl1);
8427 declare_parm_level ();
8429 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
8430 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
8431 DECL_ARTIFICIAL (resdecl) = 1;
8432 DECL_IGNORED_P (resdecl) = 1;
8433 DECL_RESULT (current_function_decl) = resdecl;
8435 start_fname_decls ();
8440 /* Subroutine of store_parm_decls which handles new-style function
8441 definitions (prototype format). The parms already have decls, so we
8442 need only record them as in effect and complain if any redundant
8443 old-style parm decls were written. */
8445 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
8451 if (current_scope->bindings)
8453 error_at (DECL_SOURCE_LOCATION (fndecl),
8454 "old-style parameter declarations in prototyped "
8455 "function definition");
8457 /* Get rid of the old-style declarations. */
8461 /* Don't issue this warning for nested functions, and don't issue this
8462 warning if we got here because ARG_INFO_TYPES was error_mark_node
8463 (this happens when a function definition has just an ellipsis in
8464 its parameter list). */
8465 else if (!in_system_header_at (input_location)
8466 && !current_function_scope
8467 && arg_info->types != error_mark_node)
8468 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
8469 "traditional C rejects ISO C style function definitions");
8471 /* Now make all the parameter declarations visible in the function body.
8472 We can bypass most of the grunt work of pushdecl. */
8473 for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl))
8475 DECL_CONTEXT (decl) = current_function_decl;
8476 if (DECL_NAME (decl))
8478 bind (DECL_NAME (decl), decl, current_scope,
8479 /*invisible=*/false, /*nested=*/false,
8481 if (!TREE_USED (decl))
8482 warn_if_shadowing (decl);
8485 error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted");
8488 /* Record the parameter list in the function declaration. */
8489 DECL_ARGUMENTS (fndecl) = arg_info->parms;
8491 /* Now make all the ancillary declarations visible, likewise. */
8492 for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl))
8494 DECL_CONTEXT (decl) = current_function_decl;
8495 if (DECL_NAME (decl))
8496 bind (DECL_NAME (decl), decl, current_scope,
8497 /*invisible=*/false,
8498 /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL),
8502 /* And all the tag declarations. */
8503 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag)
8505 bind (tag->id, tag->type, current_scope,
8506 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
8509 /* Subroutine of store_parm_decls which handles old-style function
8510 definitions (separate parameter list and declarations). */
8513 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
8515 struct c_binding *b;
8516 tree parm, decl, last;
8517 tree parmids = arg_info->parms;
8518 hash_set<tree> seen_args;
8520 if (!in_system_header_at (input_location))
8521 warning_at (DECL_SOURCE_LOCATION (fndecl),
8522 OPT_Wold_style_definition, "old-style function definition");
8524 /* Match each formal parameter name with its declaration. Save each
8525 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8526 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8528 if (TREE_VALUE (parm) == 0)
8530 error_at (DECL_SOURCE_LOCATION (fndecl),
8531 "parameter name missing from parameter list");
8532 TREE_PURPOSE (parm) = 0;
8536 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
8537 if (b && B_IN_CURRENT_SCOPE (b))
8540 /* Skip erroneous parameters. */
8541 if (decl == error_mark_node)
8543 /* If we got something other than a PARM_DECL it is an error. */
8544 if (TREE_CODE (decl) != PARM_DECL)
8545 error_at (DECL_SOURCE_LOCATION (decl),
8546 "%qD declared as a non-parameter", decl);
8547 /* If the declaration is already marked, we have a duplicate
8548 name. Complain and ignore the duplicate. */
8549 else if (seen_args.contains (decl))
8551 error_at (DECL_SOURCE_LOCATION (decl),
8552 "multiple parameters named %qD", decl);
8553 TREE_PURPOSE (parm) = 0;
8556 /* If the declaration says "void", complain and turn it into
8558 else if (VOID_TYPE_P (TREE_TYPE (decl)))
8560 error_at (DECL_SOURCE_LOCATION (decl),
8561 "parameter %qD declared with void type", decl);
8562 TREE_TYPE (decl) = integer_type_node;
8563 DECL_ARG_TYPE (decl) = integer_type_node;
8564 layout_decl (decl, 0);
8566 warn_if_shadowing (decl);
8568 /* If no declaration found, default to int. */
8571 /* FIXME diagnostics: This should be the location of the argument,
8572 not the FNDECL. E.g., for an old-style declaration
8574 int f10(v) { blah; }
8576 We should use the location of the V, not the F10.
8577 Unfortunately, the V is an IDENTIFIER_NODE which has no
8578 location. In the future we need locations for c_arg_info
8581 See gcc.dg/Wshadow-3.c for an example of this problem. */
8582 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
8583 PARM_DECL, TREE_VALUE (parm), integer_type_node);
8584 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
8586 warn_if_shadowing (decl);
8589 pedwarn (DECL_SOURCE_LOCATION (decl),
8590 OPT_Wimplicit_int, "type of %qD defaults to %<int%>",
8593 warning_at (DECL_SOURCE_LOCATION (decl),
8594 OPT_Wmissing_parameter_type,
8595 "type of %qD defaults to %<int%>", decl);
8598 TREE_PURPOSE (parm) = decl;
8599 seen_args.add (decl);
8602 /* Now examine the parms chain for incomplete declarations
8603 and declarations with no corresponding names. */
8605 for (b = current_scope->bindings; b; b = b->prev)
8608 if (TREE_CODE (parm) != PARM_DECL)
8611 if (TREE_TYPE (parm) != error_mark_node
8612 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
8614 error_at (DECL_SOURCE_LOCATION (parm),
8615 "parameter %qD has incomplete type", parm);
8616 TREE_TYPE (parm) = error_mark_node;
8619 if (!seen_args.contains (parm))
8621 error_at (DECL_SOURCE_LOCATION (parm),
8622 "declaration for parameter %qD but no such parameter",
8625 /* Pretend the parameter was not missing.
8626 This gets us to a standard state and minimizes
8627 further error messages. */
8628 parmids = chainon (parmids, tree_cons (parm, 0, 0));
8632 /* Chain the declarations together in the order of the list of
8633 names. Store that chain in the function decl, replacing the
8634 list of names. Update the current scope to match. */
8635 DECL_ARGUMENTS (fndecl) = 0;
8637 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8638 if (TREE_PURPOSE (parm))
8640 if (parm && TREE_PURPOSE (parm))
8642 last = TREE_PURPOSE (parm);
8643 DECL_ARGUMENTS (fndecl) = last;
8645 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
8646 if (TREE_PURPOSE (parm))
8648 DECL_CHAIN (last) = TREE_PURPOSE (parm);
8649 last = TREE_PURPOSE (parm);
8651 DECL_CHAIN (last) = 0;
8654 /* If there was a previous prototype,
8655 set the DECL_ARG_TYPE of each argument according to
8656 the type previously specified, and report any mismatches. */
8658 if (current_function_prototype_arg_types)
8661 for (parm = DECL_ARGUMENTS (fndecl),
8662 type = current_function_prototype_arg_types;
8663 parm || (type && TREE_VALUE (type) != error_mark_node
8664 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
8665 parm = DECL_CHAIN (parm), type = TREE_CHAIN (type))
8667 if (parm == 0 || type == 0
8668 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
8670 if (current_function_prototype_built_in)
8671 warning_at (DECL_SOURCE_LOCATION (fndecl),
8672 0, "number of arguments doesn%'t match "
8673 "built-in prototype");
8676 /* FIXME diagnostics: This should be the location of
8677 FNDECL, but there is bug when a prototype is
8678 declared inside function context, but defined
8679 outside of it (e.g., gcc.dg/pr15698-2.c). In
8680 which case FNDECL gets the location of the
8681 prototype, not the definition. */
8682 error_at (input_location,
8683 "number of arguments doesn%'t match prototype");
8685 error_at (current_function_prototype_locus,
8686 "prototype declaration");
8690 /* Type for passing arg must be consistent with that
8691 declared for the arg. ISO C says we take the unqualified
8692 type for parameters declared with qualified type. */
8693 if (TREE_TYPE (parm) != error_mark_node
8694 && TREE_TYPE (type) != error_mark_node
8695 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
8696 != TYPE_ATOMIC (TREE_VALUE (type)))
8697 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
8698 TYPE_MAIN_VARIANT (TREE_VALUE (type)))))
8700 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm))
8701 == TYPE_ATOMIC (TREE_VALUE (type)))
8702 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
8703 == TYPE_MAIN_VARIANT (TREE_VALUE (type))))
8705 /* Adjust argument to match prototype. E.g. a previous
8706 `int foo(float);' prototype causes
8707 `int foo(x) float x; {...}' to be treated like
8708 `int foo(float x) {...}'. This is particularly
8709 useful for argument types like uid_t. */
8710 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
8712 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
8713 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
8714 && TYPE_PRECISION (TREE_TYPE (parm))
8715 < TYPE_PRECISION (integer_type_node))
8716 DECL_ARG_TYPE (parm)
8717 = c_type_promotes_to (TREE_TYPE (parm));
8719 /* ??? Is it possible to get here with a
8720 built-in prototype or will it always have
8721 been diagnosed as conflicting with an
8722 old-style definition and discarded? */
8723 if (current_function_prototype_built_in)
8724 warning_at (DECL_SOURCE_LOCATION (parm),
8725 OPT_Wpedantic, "promoted argument %qD "
8726 "doesn%'t match built-in prototype", parm);
8729 pedwarn (DECL_SOURCE_LOCATION (parm),
8730 OPT_Wpedantic, "promoted argument %qD "
8731 "doesn%'t match prototype", parm);
8732 pedwarn (current_function_prototype_locus, OPT_Wpedantic,
8733 "prototype declaration");
8738 if (current_function_prototype_built_in)
8739 warning_at (DECL_SOURCE_LOCATION (parm),
8740 0, "argument %qD doesn%'t match "
8741 "built-in prototype", parm);
8744 error_at (DECL_SOURCE_LOCATION (parm),
8745 "argument %qD doesn%'t match prototype", parm);
8746 error_at (current_function_prototype_locus,
8747 "prototype declaration");
8752 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
8755 /* Otherwise, create a prototype that would match. */
8759 tree actual = 0, last = 0, type;
8761 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm))
8763 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
8765 TREE_CHAIN (last) = type;
8770 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
8772 TREE_CHAIN (last) = type;
8776 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8777 of the type of this function, but we need to avoid having this
8778 affect the types of other similarly-typed functions, so we must
8779 first force the generation of an identical (but separate) type
8780 node for the relevant function type. The new node we create
8781 will be a variant of the main variant of the original function
8784 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
8786 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
8790 /* Store parameter declarations passed in ARG_INFO into the current
8791 function declaration. */
8794 store_parm_decls_from (struct c_arg_info *arg_info)
8796 current_function_arg_info = arg_info;
8797 store_parm_decls ();
8800 /* Store the parameter declarations into the current function declaration.
8801 This is called after parsing the parameter declarations, before
8802 digesting the body of the function.
8804 For an old-style definition, construct a prototype out of the old-style
8805 parameter declarations and inject it into the function's type. */
8808 store_parm_decls (void)
8810 tree fndecl = current_function_decl;
8813 /* The argument information block for FNDECL. */
8814 struct c_arg_info *arg_info = current_function_arg_info;
8815 current_function_arg_info = 0;
8817 /* True if this definition is written with a prototype. Note:
8818 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8819 list in a function definition as equivalent to (void) -- an
8820 empty argument list specifies the function has no parameters,
8821 but only (void) sets up a prototype for future calls. */
8822 proto = arg_info->types != 0;
8825 store_parm_decls_newstyle (fndecl, arg_info);
8827 store_parm_decls_oldstyle (fndecl, arg_info);
8829 /* The next call to push_scope will be a function body. */
8831 next_is_function_body = true;
8833 /* Write a record describing this function definition to the prototypes
8834 file (if requested). */
8836 gen_aux_info_record (fndecl, 1, 0, proto);
8838 /* Initialize the RTL code for the function. */
8839 allocate_struct_function (fndecl, false);
8841 if (warn_unused_local_typedefs)
8842 cfun->language = ggc_cleared_alloc<language_function> ();
8844 /* Begin the statement tree for this function. */
8845 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
8847 /* ??? Insert the contents of the pending sizes list into the function
8848 to be evaluated. The only reason left to have this is
8849 void foo(int n, int array[n++])
8850 because we throw away the array type in favor of a pointer type, and
8851 thus won't naturally see the SAVE_EXPR containing the increment. All
8852 other pending sizes would be handled by gimplify_parameters. */
8853 if (arg_info->pending_sizes)
8854 add_stmt (arg_info->pending_sizes);
8857 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8858 c_finish_omp_declare_simd for function prototypes. No diagnostics
8862 temp_store_parm_decls (tree fndecl, tree parms)
8865 for (tree p = parms; p; p = DECL_CHAIN (p))
8867 DECL_CONTEXT (p) = fndecl;
8869 bind (DECL_NAME (p), p, current_scope,
8870 /*invisible=*/false, /*nested=*/false,
8875 /* Undo what temp_store_parm_decls did. */
8878 temp_pop_parm_decls (void)
8880 /* Clear all bindings in this temporary scope, so that
8881 pop_scope doesn't create a BLOCK. */
8882 struct c_binding *b = current_scope->bindings;
8883 current_scope->bindings = NULL;
8884 for (; b; b = free_binding_and_advance (b))
8886 gcc_assert (TREE_CODE (b->decl) == PARM_DECL);
8887 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
8888 I_SYMBOL_BINDING (b->id) = b->shadowed;
8889 if (b->shadowed && b->shadowed->u.type)
8890 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
8896 /* Finish up a function declaration and compile that function
8897 all the way to assembler language output. Then free the storage
8898 for the function definition.
8900 This is called after parsing the body of the function definition. */
8903 finish_function (void)
8905 tree fndecl = current_function_decl;
8907 if (c_dialect_objc ())
8908 objc_finish_function ();
8910 if (TREE_CODE (fndecl) == FUNCTION_DECL
8911 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
8913 tree args = DECL_ARGUMENTS (fndecl);
8914 for (; args; args = DECL_CHAIN (args))
8916 tree type = TREE_TYPE (args);
8917 if (INTEGRAL_TYPE_P (type)
8918 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
8919 DECL_ARG_TYPE (args) = c_type_promotes_to (type);
8923 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
8924 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
8926 /* Must mark the RESULT_DECL as being in this function. */
8928 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
8929 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
8931 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
8932 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
8933 == integer_type_node && flag_isoc99)
8935 /* Hack. We don't want the middle-end to warn that this return
8936 is unreachable, so we mark its location as special. Using
8937 UNKNOWN_LOCATION has the problem that it gets clobbered in
8938 annotate_one_with_locus. A cleaner solution might be to
8939 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8941 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
8944 /* Tie off the statement tree for this function. */
8945 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
8947 /* If the function has _Cilk_spawn in front of a function call inside it
8948 i.e. it is a spawning function, then add the appropriate Cilk plus
8949 functions inside. */
8950 if (fn_contains_cilk_spawn_p (cfun))
8951 cfun->cilk_frame_decl = insert_cilk_frame (fndecl);
8953 finish_fname_decls ();
8955 /* Complain if there's just no return statement. */
8956 if (warn_return_type
8957 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
8958 && !current_function_returns_value && !current_function_returns_null
8959 /* Don't complain if we are no-return. */
8960 && !current_function_returns_abnormally
8961 /* Don't complain if we are declared noreturn. */
8962 && !TREE_THIS_VOLATILE (fndecl)
8963 /* Don't warn for main(). */
8964 && !MAIN_NAME_P (DECL_NAME (fndecl))
8965 /* Or if they didn't actually specify a return type. */
8966 && !C_FUNCTION_IMPLICIT_INT (fndecl)
8967 /* Normally, with -Wreturn-type, flow will complain, but we might
8968 optimize out static functions. */
8969 && !TREE_PUBLIC (fndecl))
8971 warning (OPT_Wreturn_type,
8972 "no return statement in function returning non-void");
8973 TREE_NO_WARNING (fndecl) = 1;
8976 /* Complain about parameters that are only set, but never otherwise used. */
8977 if (warn_unused_but_set_parameter)
8981 for (decl = DECL_ARGUMENTS (fndecl);
8983 decl = DECL_CHAIN (decl))
8984 if (TREE_USED (decl)
8985 && TREE_CODE (decl) == PARM_DECL
8986 && !DECL_READ_P (decl)
8988 && !DECL_ARTIFICIAL (decl)
8989 && !TREE_NO_WARNING (decl))
8990 warning_at (DECL_SOURCE_LOCATION (decl),
8991 OPT_Wunused_but_set_parameter,
8992 "parameter %qD set but not used", decl);
8995 /* Complain about locally defined typedefs that are not used in this
8997 maybe_warn_unused_local_typedefs ();
8999 /* Store the end of the function, so that we get good line number
9000 info for the epilogue. */
9001 cfun->function_end_locus = input_location;
9003 /* Finalize the ELF visibility for the function. */
9004 c_determine_visibility (fndecl);
9006 /* For GNU C extern inline functions disregard inline limits. */
9007 if (DECL_EXTERNAL (fndecl)
9008 && DECL_DECLARED_INLINE_P (fndecl))
9009 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
9011 /* Genericize before inlining. Delay genericizing nested functions
9012 until their parent function is genericized. Since finalizing
9013 requires GENERIC, delay that as well. */
9015 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
9016 && !undef_nested_function)
9018 if (!decl_function_context (fndecl))
9020 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
9021 c_genericize (fndecl);
9023 /* ??? Objc emits functions after finalizing the compilation unit.
9024 This should be cleaned up later and this conditional removed. */
9025 if (symtab->global_info_ready)
9027 cgraph_node::add_new_function (fndecl, false);
9030 cgraph_node::finalize_function (fndecl, false);
9034 /* Register this function with cgraph just far enough to get it
9035 added to our parent's nested function list. Handy, since the
9036 C front end doesn't have such a list. */
9037 (void) cgraph_node::get_create (fndecl);
9041 if (!decl_function_context (fndecl))
9042 undef_nested_function = false;
9044 if (cfun->language != NULL)
9046 ggc_free (cfun->language);
9047 cfun->language = NULL;
9050 /* We're leaving the context of this function, so zap cfun.
9051 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
9052 tree_rest_of_compilation. */
9054 current_function_decl = NULL;
9057 /* Check the declarations given in a for-loop for satisfying the C99
9058 constraints. If exactly one such decl is found, return it. LOC is
9059 the location of the opening parenthesis of the for loop. The last
9060 parameter allows you to control the "for loop initial declarations
9061 are only allowed in C99 mode". Normally, you should pass
9062 flag_isoc99 as that parameter. But in some cases (Objective-C
9063 foreach loop, for example) we want to run the checks in this
9064 function even if not in C99 mode, so we allow the caller to turn
9065 off the error about not being in C99 mode.
9069 check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error)
9071 struct c_binding *b;
9072 tree one_decl = NULL_TREE;
9075 if (!turn_off_iso_c99_error)
9077 static bool hint = true;
9078 /* If we get here, declarations have been used in a for loop without
9079 the C99 for loop scope. This doesn't make much sense, so don't
9081 error_at (loc, "%<for%> loop initial declarations "
9082 "are only allowed in C99 or C11 mode");
9086 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
9087 "to compile your code");
9092 /* C99 subclause 6.8.5 paragraph 3:
9094 [#3] The declaration part of a for statement shall only
9095 declare identifiers for objects having storage class auto or
9098 It isn't clear whether, in this sentence, "identifiers" binds to
9099 "shall only declare" or to "objects" - that is, whether all identifiers
9100 declared must be identifiers for objects, or whether the restriction
9101 only applies to those that are. (A question on this in comp.std.c
9102 in November 2000 received no answer.) We implement the strictest
9103 interpretation, to avoid creating an extension which later causes
9106 for (b = current_scope->bindings; b; b = b->prev)
9109 tree decl = b->decl;
9114 switch (TREE_CODE (decl))
9118 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
9119 if (TREE_STATIC (decl))
9121 "declaration of static variable %qD in %<for%> loop "
9122 "initial declaration", decl);
9123 else if (DECL_EXTERNAL (decl))
9125 "declaration of %<extern%> variable %qD in %<for%> loop "
9126 "initial declaration", decl);
9132 "%<struct %E%> declared in %<for%> loop initial "
9137 "%<union %E%> declared in %<for%> loop initial declaration",
9141 error_at (loc, "%<enum %E%> declared in %<for%> loop "
9142 "initial declaration", id);
9145 error_at (loc, "declaration of non-variable "
9146 "%qD in %<for%> loop initial declaration", decl);
9153 return n_decls == 1 ? one_decl : NULL_TREE;
9156 /* Save and reinitialize the variables
9157 used during compilation of a C function. */
9160 c_push_function_context (void)
9162 struct language_function *p = cfun->language;
9163 /* cfun->language might have been already allocated by the use of
9164 -Wunused-local-typedefs. In that case, just re-use it. */
9166 cfun->language = p = ggc_cleared_alloc<language_function> ();
9168 p->base.x_stmt_tree = c_stmt_tree;
9169 c_stmt_tree.x_cur_stmt_list = vec_safe_copy (c_stmt_tree.x_cur_stmt_list);
9170 p->x_break_label = c_break_label;
9171 p->x_cont_label = c_cont_label;
9172 p->x_switch_stack = c_switch_stack;
9173 p->arg_info = current_function_arg_info;
9174 p->returns_value = current_function_returns_value;
9175 p->returns_null = current_function_returns_null;
9176 p->returns_abnormally = current_function_returns_abnormally;
9177 p->warn_about_return_type = warn_about_return_type;
9179 push_function_context ();
9182 /* Restore the variables used during compilation of a C function. */
9185 c_pop_function_context (void)
9187 struct language_function *p;
9189 pop_function_context ();
9192 /* When -Wunused-local-typedefs is in effect, cfun->languages is
9193 used to store data throughout the life time of the current cfun,
9194 So don't deallocate it. */
9195 if (!warn_unused_local_typedefs)
9196 cfun->language = NULL;
9198 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
9199 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
9201 /* Stop pointing to the local nodes about to be freed. */
9202 /* But DECL_INITIAL must remain nonzero so we know this
9203 was an actual function definition. */
9204 DECL_INITIAL (current_function_decl) = error_mark_node;
9205 DECL_ARGUMENTS (current_function_decl) = 0;
9208 c_stmt_tree = p->base.x_stmt_tree;
9209 p->base.x_stmt_tree.x_cur_stmt_list = NULL;
9210 c_break_label = p->x_break_label;
9211 c_cont_label = p->x_cont_label;
9212 c_switch_stack = p->x_switch_stack;
9213 current_function_arg_info = p->arg_info;
9214 current_function_returns_value = p->returns_value;
9215 current_function_returns_null = p->returns_null;
9216 current_function_returns_abnormally = p->returns_abnormally;
9217 warn_about_return_type = p->warn_about_return_type;
9220 /* The functions below are required for functionality of doing
9221 function at once processing in the C front end. Currently these
9222 functions are not called from anywhere in the C front end, but as
9223 these changes continue, that will change. */
9225 /* Returns the stmt_tree (if any) to which statements are currently
9226 being added. If there is no active statement-tree, NULL is
9230 current_stmt_tree (void)
9232 return &c_stmt_tree;
9235 /* Return the global value of T as a symbol. */
9238 identifier_global_value (tree t)
9240 struct c_binding *b;
9242 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
9243 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
9249 /* In C, the only C-linkage public declaration is at file scope. */
9252 c_linkage_bindings (tree name)
9254 return identifier_global_value (name);
9257 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
9258 otherwise the name is found in ridpointers from RID_INDEX. */
9261 record_builtin_type (enum rid rid_index, const char *name, tree type)
9265 id = ridpointers[(int) rid_index];
9267 id = get_identifier (name);
9268 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
9270 if (debug_hooks->type_decl)
9271 debug_hooks->type_decl (decl, false);
9274 /* Build the void_list_node (void_type_node having been created). */
9276 build_void_list_node (void)
9278 tree t = build_tree_list (NULL_TREE, void_type_node);
9282 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
9285 build_c_parm (struct c_declspecs *specs, tree attrs,
9286 struct c_declarator *declarator)
9288 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
9291 ret->declarator = declarator;
9295 /* Return a declarator with nested attributes. TARGET is the inner
9296 declarator to which these attributes apply. ATTRS are the
9299 struct c_declarator *
9300 build_attrs_declarator (tree attrs, struct c_declarator *target)
9302 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9303 ret->kind = cdk_attrs;
9304 ret->declarator = target;
9305 ret->u.attrs = attrs;
9309 /* Return a declarator for a function with arguments specified by ARGS
9310 and return type specified by TARGET. */
9312 struct c_declarator *
9313 build_function_declarator (struct c_arg_info *args,
9314 struct c_declarator *target)
9316 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9317 ret->kind = cdk_function;
9318 ret->declarator = target;
9319 ret->u.arg_info = args;
9323 /* Return a declarator for the identifier IDENT (which may be
9324 NULL_TREE for an abstract declarator). */
9326 struct c_declarator *
9327 build_id_declarator (tree ident)
9329 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9331 ret->declarator = 0;
9333 /* Default value - may get reset to a more precise location. */
9334 ret->id_loc = input_location;
9338 /* Return something to represent absolute declarators containing a *.
9339 TARGET is the absolute declarator that the * contains.
9340 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
9341 to apply to the pointer type. */
9343 struct c_declarator *
9344 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
9345 struct c_declarator *target)
9349 struct c_declarator *itarget = target;
9350 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
9351 if (type_quals_attrs)
9353 attrs = type_quals_attrs->attrs;
9354 quals = quals_from_declspecs (type_quals_attrs);
9355 if (attrs != NULL_TREE)
9356 itarget = build_attrs_declarator (attrs, target);
9358 ret->kind = cdk_pointer;
9359 ret->declarator = itarget;
9360 ret->u.pointer_quals = quals;
9364 /* Return a pointer to a structure for an empty list of declaration
9367 struct c_declspecs *
9368 build_null_declspecs (void)
9370 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
9371 memset (&ret->locations, 0, cdw_number_of_elements);
9376 ret->align_log = -1;
9377 ret->typespec_word = cts_none;
9378 ret->storage_class = csc_none;
9379 ret->expr_const_operands = true;
9380 ret->declspecs_seen_p = false;
9381 ret->typespec_kind = ctsk_none;
9382 ret->non_sc_seen_p = false;
9383 ret->typedef_p = false;
9384 ret->explicit_signed_p = false;
9385 ret->deprecated_p = false;
9386 ret->default_int_p = false;
9387 ret->long_p = false;
9388 ret->long_long_p = false;
9389 ret->short_p = false;
9390 ret->signed_p = false;
9391 ret->unsigned_p = false;
9392 ret->complex_p = false;
9393 ret->inline_p = false;
9394 ret->noreturn_p = false;
9395 ret->thread_p = false;
9396 ret->thread_gnu_p = false;
9397 ret->const_p = false;
9398 ret->volatile_p = false;
9399 ret->atomic_p = false;
9400 ret->restrict_p = false;
9401 ret->saturating_p = false;
9402 ret->alignas_p = false;
9403 ret->address_space = ADDR_SPACE_GENERIC;
9407 /* Add the address space ADDRSPACE to the declaration specifiers
9408 SPECS, returning SPECS. */
9410 struct c_declspecs *
9411 declspecs_add_addrspace (source_location location,
9412 struct c_declspecs *specs, addr_space_t as)
9414 specs->non_sc_seen_p = true;
9415 specs->declspecs_seen_p = true;
9417 if (!ADDR_SPACE_GENERIC_P (specs->address_space)
9418 && specs->address_space != as)
9419 error ("incompatible address space qualifiers %qs and %qs",
9420 c_addr_space_name (as),
9421 c_addr_space_name (specs->address_space));
9424 specs->address_space = as;
9425 specs->locations[cdw_address_space] = location;
9430 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9433 struct c_declspecs *
9434 declspecs_add_qual (source_location loc,
9435 struct c_declspecs *specs, tree qual)
9439 specs->non_sc_seen_p = true;
9440 specs->declspecs_seen_p = true;
9441 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
9442 && C_IS_RESERVED_WORD (qual));
9443 i = C_RID_CODE (qual);
9447 dupe = specs->const_p;
9448 specs->const_p = true;
9449 specs->locations[cdw_const] = loc;
9452 dupe = specs->volatile_p;
9453 specs->volatile_p = true;
9454 specs->locations[cdw_volatile] = loc;
9457 dupe = specs->restrict_p;
9458 specs->restrict_p = true;
9459 specs->locations[cdw_restrict] = loc;
9462 dupe = specs->atomic_p;
9463 specs->atomic_p = true;
9469 pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %qE", qual);
9473 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9476 struct c_declspecs *
9477 declspecs_add_type (location_t loc, struct c_declspecs *specs,
9478 struct c_typespec spec)
9480 tree type = spec.spec;
9481 specs->non_sc_seen_p = true;
9482 specs->declspecs_seen_p = true;
9483 specs->typespec_kind = spec.kind;
9484 if (TREE_DEPRECATED (type))
9485 specs->deprecated_p = true;
9487 /* Handle type specifier keywords. */
9488 if (TREE_CODE (type) == IDENTIFIER_NODE
9489 && C_IS_RESERVED_WORD (type)
9490 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
9492 enum rid i = C_RID_CODE (type);
9495 error_at (loc, "two or more data types in declaration specifiers");
9498 if ((int) i <= (int) RID_LAST_MODIFIER)
9500 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9505 if (specs->long_long_p)
9507 error_at (loc, "%<long long long%> is too long for GCC");
9512 if (specs->typespec_word == cts_double)
9515 ("both %<long long%> and %<double%> in "
9516 "declaration specifiers"));
9519 pedwarn_c90 (loc, OPT_Wlong_long,
9520 "ISO C90 does not support %<long long%>");
9521 specs->long_long_p = 1;
9522 specs->locations[cdw_long_long] = loc;
9527 ("both %<long%> and %<short%> in "
9528 "declaration specifiers"));
9529 else if (specs->typespec_word == cts_auto_type)
9531 ("both %<long%> and %<__auto_type%> in "
9532 "declaration specifiers"));
9533 else if (specs->typespec_word == cts_void)
9535 ("both %<long%> and %<void%> in "
9536 "declaration specifiers"));
9537 else if (specs->typespec_word == cts_int_n)
9539 ("both %<long%> and %<__int%d%> in "
9540 "declaration specifiers"),
9541 int_n_data[specs->int_n_idx].bitsize);
9542 else if (specs->typespec_word == cts_bool)
9544 ("both %<long%> and %<_Bool%> in "
9545 "declaration specifiers"));
9546 else if (specs->typespec_word == cts_char)
9548 ("both %<long%> and %<char%> in "
9549 "declaration specifiers"));
9550 else if (specs->typespec_word == cts_float)
9552 ("both %<long%> and %<float%> in "
9553 "declaration specifiers"));
9554 else if (specs->typespec_word == cts_dfloat32)
9556 ("both %<long%> and %<_Decimal32%> in "
9557 "declaration specifiers"));
9558 else if (specs->typespec_word == cts_dfloat64)
9560 ("both %<long%> and %<_Decimal64%> in "
9561 "declaration specifiers"));
9562 else if (specs->typespec_word == cts_dfloat128)
9564 ("both %<long%> and %<_Decimal128%> in "
9565 "declaration specifiers"));
9568 specs->long_p = true;
9569 specs->locations[cdw_long] = loc;
9573 dupe = specs->short_p;
9576 ("both %<long%> and %<short%> in "
9577 "declaration specifiers"));
9578 else if (specs->typespec_word == cts_auto_type)
9580 ("both %<short%> and %<__auto_type%> in "
9581 "declaration specifiers"));
9582 else if (specs->typespec_word == cts_void)
9584 ("both %<short%> and %<void%> in "
9585 "declaration specifiers"));
9586 else if (specs->typespec_word == cts_int_n)
9588 ("both %<short%> and %<__int%d%> in "
9589 "declaration specifiers"),
9590 int_n_data[specs->int_n_idx].bitsize);
9591 else if (specs->typespec_word == cts_bool)
9593 ("both %<short%> and %<_Bool%> in "
9594 "declaration specifiers"));
9595 else if (specs->typespec_word == cts_char)
9597 ("both %<short%> and %<char%> in "
9598 "declaration specifiers"));
9599 else if (specs->typespec_word == cts_float)
9601 ("both %<short%> and %<float%> in "
9602 "declaration specifiers"));
9603 else if (specs->typespec_word == cts_double)
9605 ("both %<short%> and %<double%> in "
9606 "declaration specifiers"));
9607 else if (specs->typespec_word == cts_dfloat32)
9609 ("both %<short%> and %<_Decimal32%> in "
9610 "declaration specifiers"));
9611 else if (specs->typespec_word == cts_dfloat64)
9613 ("both %<short%> and %<_Decimal64%> in "
9614 "declaration specifiers"));
9615 else if (specs->typespec_word == cts_dfloat128)
9617 ("both %<short%> and %<_Decimal128%> in "
9618 "declaration specifiers"));
9621 specs->short_p = true;
9622 specs->locations[cdw_short] = loc;
9626 dupe = specs->signed_p;
9627 if (specs->unsigned_p)
9629 ("both %<signed%> and %<unsigned%> in "
9630 "declaration specifiers"));
9631 else if (specs->typespec_word == cts_auto_type)
9633 ("both %<signed%> and %<__auto_type%> in "
9634 "declaration specifiers"));
9635 else if (specs->typespec_word == cts_void)
9637 ("both %<signed%> and %<void%> in "
9638 "declaration specifiers"));
9639 else if (specs->typespec_word == cts_bool)
9641 ("both %<signed%> and %<_Bool%> in "
9642 "declaration specifiers"));
9643 else if (specs->typespec_word == cts_float)
9645 ("both %<signed%> and %<float%> in "
9646 "declaration specifiers"));
9647 else if (specs->typespec_word == cts_double)
9649 ("both %<signed%> and %<double%> in "
9650 "declaration specifiers"));
9651 else if (specs->typespec_word == cts_dfloat32)
9653 ("both %<signed%> and %<_Decimal32%> in "
9654 "declaration specifiers"));
9655 else if (specs->typespec_word == cts_dfloat64)
9657 ("both %<signed%> and %<_Decimal64%> in "
9658 "declaration specifiers"));
9659 else if (specs->typespec_word == cts_dfloat128)
9661 ("both %<signed%> and %<_Decimal128%> in "
9662 "declaration specifiers"));
9665 specs->signed_p = true;
9666 specs->locations[cdw_signed] = loc;
9670 dupe = specs->unsigned_p;
9671 if (specs->signed_p)
9673 ("both %<signed%> and %<unsigned%> in "
9674 "declaration specifiers"));
9675 else if (specs->typespec_word == cts_auto_type)
9677 ("both %<unsigned%> and %<__auto_type%> in "
9678 "declaration specifiers"));
9679 else if (specs->typespec_word == cts_void)
9681 ("both %<unsigned%> and %<void%> in "
9682 "declaration specifiers"));
9683 else if (specs->typespec_word == cts_bool)
9685 ("both %<unsigned%> and %<_Bool%> in "
9686 "declaration specifiers"));
9687 else if (specs->typespec_word == cts_float)
9689 ("both %<unsigned%> and %<float%> in "
9690 "declaration specifiers"));
9691 else if (specs->typespec_word == cts_double)
9693 ("both %<unsigned%> and %<double%> in "
9694 "declaration specifiers"));
9695 else if (specs->typespec_word == cts_dfloat32)
9697 ("both %<unsigned%> and %<_Decimal32%> in "
9698 "declaration specifiers"));
9699 else if (specs->typespec_word == cts_dfloat64)
9701 ("both %<unsigned%> and %<_Decimal64%> in "
9702 "declaration specifiers"));
9703 else if (specs->typespec_word == cts_dfloat128)
9705 ("both %<unsigned%> and %<_Decimal128%> in "
9706 "declaration specifiers"));
9709 specs->unsigned_p = true;
9710 specs->locations[cdw_unsigned] = loc;
9714 dupe = specs->complex_p;
9715 if (!in_system_header_at (loc))
9716 pedwarn_c90 (loc, OPT_Wpedantic,
9717 "ISO C90 does not support complex types");
9718 if (specs->typespec_word == cts_auto_type)
9720 ("both %<complex%> and %<__auto_type%> in "
9721 "declaration specifiers"));
9722 else if (specs->typespec_word == cts_void)
9724 ("both %<complex%> and %<void%> in "
9725 "declaration specifiers"));
9726 else if (specs->typespec_word == cts_bool)
9728 ("both %<complex%> and %<_Bool%> in "
9729 "declaration specifiers"));
9730 else if (specs->typespec_word == cts_dfloat32)
9732 ("both %<complex%> and %<_Decimal32%> in "
9733 "declaration specifiers"));
9734 else if (specs->typespec_word == cts_dfloat64)
9736 ("both %<complex%> and %<_Decimal64%> in "
9737 "declaration specifiers"));
9738 else if (specs->typespec_word == cts_dfloat128)
9740 ("both %<complex%> and %<_Decimal128%> in "
9741 "declaration specifiers"));
9742 else if (specs->typespec_word == cts_fract)
9744 ("both %<complex%> and %<_Fract%> in "
9745 "declaration specifiers"));
9746 else if (specs->typespec_word == cts_accum)
9748 ("both %<complex%> and %<_Accum%> in "
9749 "declaration specifiers"));
9750 else if (specs->saturating_p)
9752 ("both %<complex%> and %<_Sat%> in "
9753 "declaration specifiers"));
9756 specs->complex_p = true;
9757 specs->locations[cdw_complex] = loc;
9761 dupe = specs->saturating_p;
9762 pedwarn (loc, OPT_Wpedantic,
9763 "ISO C does not support saturating types");
9764 if (specs->typespec_word == cts_int_n)
9767 ("both %<_Sat%> and %<__int%d%> in "
9768 "declaration specifiers"),
9769 int_n_data[specs->int_n_idx].bitsize);
9771 else if (specs->typespec_word == cts_auto_type)
9773 ("both %<_Sat%> and %<__auto_type%> in "
9774 "declaration specifiers"));
9775 else if (specs->typespec_word == cts_void)
9777 ("both %<_Sat%> and %<void%> in "
9778 "declaration specifiers"));
9779 else if (specs->typespec_word == cts_bool)
9781 ("both %<_Sat%> and %<_Bool%> in "
9782 "declaration specifiers"));
9783 else if (specs->typespec_word == cts_char)
9785 ("both %<_Sat%> and %<char%> in "
9786 "declaration specifiers"));
9787 else if (specs->typespec_word == cts_int)
9789 ("both %<_Sat%> and %<int%> in "
9790 "declaration specifiers"));
9791 else if (specs->typespec_word == cts_float)
9793 ("both %<_Sat%> and %<float%> in "
9794 "declaration specifiers"));
9795 else if (specs->typespec_word == cts_double)
9797 ("both %<_Sat%> and %<double%> in "
9798 "declaration specifiers"));
9799 else if (specs->typespec_word == cts_dfloat32)
9801 ("both %<_Sat%> and %<_Decimal32%> in "
9802 "declaration specifiers"));
9803 else if (specs->typespec_word == cts_dfloat64)
9805 ("both %<_Sat%> and %<_Decimal64%> in "
9806 "declaration specifiers"));
9807 else if (specs->typespec_word == cts_dfloat128)
9809 ("both %<_Sat%> and %<_Decimal128%> in "
9810 "declaration specifiers"));
9811 else if (specs->complex_p)
9813 ("both %<_Sat%> and %<complex%> in "
9814 "declaration specifiers"));
9817 specs->saturating_p = true;
9818 specs->locations[cdw_saturating] = loc;
9826 error_at (loc, "duplicate %qE", type);
9832 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9833 "__intN", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9835 if (specs->typespec_word != cts_none)
9838 "two or more data types in declaration specifiers");
9846 ("both %<long%> and %<__auto_type%> in "
9847 "declaration specifiers"));
9848 else if (specs->short_p)
9850 ("both %<short%> and %<__auto_type%> in "
9851 "declaration specifiers"));
9852 else if (specs->signed_p)
9854 ("both %<signed%> and %<__auto_type%> in "
9855 "declaration specifiers"));
9856 else if (specs->unsigned_p)
9858 ("both %<unsigned%> and %<__auto_type%> in "
9859 "declaration specifiers"));
9860 else if (specs->complex_p)
9862 ("both %<complex%> and %<__auto_type%> in "
9863 "declaration specifiers"));
9864 else if (specs->saturating_p)
9866 ("both %<_Sat%> and %<__auto_type%> in "
9867 "declaration specifiers"));
9870 specs->typespec_word = cts_auto_type;
9871 specs->locations[cdw_typespec] = loc;
9878 specs->int_n_idx = i - RID_INT_N_0;
9879 if (!in_system_header_at (input_location))
9880 pedwarn (loc, OPT_Wpedantic,
9881 "ISO C does not support %<__int%d%> types",
9882 int_n_data[specs->int_n_idx].bitsize);
9886 ("both %<__int%d%> and %<long%> in "
9887 "declaration specifiers"),
9888 int_n_data[specs->int_n_idx].bitsize);
9889 else if (specs->saturating_p)
9891 ("both %<_Sat%> and %<__int%d%> in "
9892 "declaration specifiers"),
9893 int_n_data[specs->int_n_idx].bitsize);
9894 else if (specs->short_p)
9896 ("both %<__int%d%> and %<short%> in "
9897 "declaration specifiers"),
9898 int_n_data[specs->int_n_idx].bitsize);
9899 else if (! int_n_enabled_p [specs->int_n_idx])
9901 "%<__int%d%> is not supported on this target",
9902 int_n_data[specs->int_n_idx].bitsize);
9905 specs->typespec_word = cts_int_n;
9906 specs->locations[cdw_typespec] = loc;
9912 ("both %<long%> and %<void%> in "
9913 "declaration specifiers"));
9914 else if (specs->short_p)
9916 ("both %<short%> and %<void%> in "
9917 "declaration specifiers"));
9918 else if (specs->signed_p)
9920 ("both %<signed%> and %<void%> in "
9921 "declaration specifiers"));
9922 else if (specs->unsigned_p)
9924 ("both %<unsigned%> and %<void%> in "
9925 "declaration specifiers"));
9926 else if (specs->complex_p)
9928 ("both %<complex%> and %<void%> in "
9929 "declaration specifiers"));
9930 else if (specs->saturating_p)
9932 ("both %<_Sat%> and %<void%> in "
9933 "declaration specifiers"));
9936 specs->typespec_word = cts_void;
9937 specs->locations[cdw_typespec] = loc;
9941 if (!in_system_header_at (loc))
9942 pedwarn_c90 (loc, OPT_Wpedantic,
9943 "ISO C90 does not support boolean types");
9946 ("both %<long%> and %<_Bool%> in "
9947 "declaration specifiers"));
9948 else if (specs->short_p)
9950 ("both %<short%> and %<_Bool%> in "
9951 "declaration specifiers"));
9952 else if (specs->signed_p)
9954 ("both %<signed%> and %<_Bool%> in "
9955 "declaration specifiers"));
9956 else if (specs->unsigned_p)
9958 ("both %<unsigned%> and %<_Bool%> in "
9959 "declaration specifiers"));
9960 else if (specs->complex_p)
9962 ("both %<complex%> and %<_Bool%> in "
9963 "declaration specifiers"));
9964 else if (specs->saturating_p)
9966 ("both %<_Sat%> and %<_Bool%> in "
9967 "declaration specifiers"));
9970 specs->typespec_word = cts_bool;
9971 specs->locations[cdw_typespec] = loc;
9977 ("both %<long%> and %<char%> in "
9978 "declaration specifiers"));
9979 else if (specs->short_p)
9981 ("both %<short%> and %<char%> in "
9982 "declaration specifiers"));
9983 else if (specs->saturating_p)
9985 ("both %<_Sat%> and %<char%> in "
9986 "declaration specifiers"));
9989 specs->typespec_word = cts_char;
9990 specs->locations[cdw_typespec] = loc;
9994 if (specs->saturating_p)
9996 ("both %<_Sat%> and %<int%> in "
9997 "declaration specifiers"));
10000 specs->typespec_word = cts_int;
10001 specs->locations[cdw_typespec] = loc;
10007 ("both %<long%> and %<float%> in "
10008 "declaration specifiers"));
10009 else if (specs->short_p)
10011 ("both %<short%> and %<float%> in "
10012 "declaration specifiers"));
10013 else if (specs->signed_p)
10015 ("both %<signed%> and %<float%> in "
10016 "declaration specifiers"));
10017 else if (specs->unsigned_p)
10019 ("both %<unsigned%> and %<float%> in "
10020 "declaration specifiers"));
10021 else if (specs->saturating_p)
10023 ("both %<_Sat%> and %<float%> in "
10024 "declaration specifiers"));
10027 specs->typespec_word = cts_float;
10028 specs->locations[cdw_typespec] = loc;
10032 if (specs->long_long_p)
10034 ("both %<long long%> and %<double%> in "
10035 "declaration specifiers"));
10036 else if (specs->short_p)
10038 ("both %<short%> and %<double%> in "
10039 "declaration specifiers"));
10040 else if (specs->signed_p)
10042 ("both %<signed%> and %<double%> in "
10043 "declaration specifiers"));
10044 else if (specs->unsigned_p)
10046 ("both %<unsigned%> and %<double%> in "
10047 "declaration specifiers"));
10048 else if (specs->saturating_p)
10050 ("both %<_Sat%> and %<double%> in "
10051 "declaration specifiers"));
10054 specs->typespec_word = cts_double;
10055 specs->locations[cdw_typespec] = loc;
10060 case RID_DFLOAT128:
10063 if (i == RID_DFLOAT32)
10064 str = "_Decimal32";
10065 else if (i == RID_DFLOAT64)
10066 str = "_Decimal64";
10068 str = "_Decimal128";
10069 if (specs->long_long_p)
10071 ("both %<long long%> and %<%s%> in "
10072 "declaration specifiers"),
10076 ("both %<long%> and %<%s%> in "
10077 "declaration specifiers"),
10079 else if (specs->short_p)
10081 ("both %<short%> and %<%s%> in "
10082 "declaration specifiers"),
10084 else if (specs->signed_p)
10086 ("both %<signed%> and %<%s%> in "
10087 "declaration specifiers"),
10089 else if (specs->unsigned_p)
10091 ("both %<unsigned%> and %<%s%> in "
10092 "declaration specifiers"),
10094 else if (specs->complex_p)
10096 ("both %<complex%> and %<%s%> in "
10097 "declaration specifiers"),
10099 else if (specs->saturating_p)
10101 ("both %<_Sat%> and %<%s%> in "
10102 "declaration specifiers"),
10104 else if (i == RID_DFLOAT32)
10105 specs->typespec_word = cts_dfloat32;
10106 else if (i == RID_DFLOAT64)
10107 specs->typespec_word = cts_dfloat64;
10109 specs->typespec_word = cts_dfloat128;
10110 specs->locations[cdw_typespec] = loc;
10112 if (!targetm.decimal_float_supported_p ())
10114 ("decimal floating point not supported "
10115 "for this target"));
10116 pedwarn (loc, OPT_Wpedantic,
10117 "ISO C does not support decimal floating point");
10123 if (i == RID_FRACT)
10127 if (specs->complex_p)
10129 ("both %<complex%> and %<%s%> in "
10130 "declaration specifiers"),
10132 else if (i == RID_FRACT)
10133 specs->typespec_word = cts_fract;
10135 specs->typespec_word = cts_accum;
10136 specs->locations[cdw_typespec] = loc;
10138 if (!targetm.fixed_point_supported_p ())
10140 "fixed-point types not supported for this target");
10141 pedwarn (loc, OPT_Wpedantic,
10142 "ISO C does not support fixed-point types");
10145 /* ObjC reserved word "id", handled below. */
10151 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
10152 form of ObjC type, cases such as "int" and "long" being handled
10153 above), a TYPE (struct, union, enum and typeof specifiers) or an
10154 ERROR_MARK. In none of these cases may there have previously
10155 been any type specifiers. */
10156 if (specs->type || specs->typespec_word != cts_none
10157 || specs->long_p || specs->short_p || specs->signed_p
10158 || specs->unsigned_p || specs->complex_p)
10159 error_at (loc, "two or more data types in declaration specifiers");
10160 else if (TREE_CODE (type) == TYPE_DECL)
10162 if (TREE_TYPE (type) == error_mark_node)
10163 ; /* Allow the type to default to int to avoid cascading errors. */
10166 specs->type = TREE_TYPE (type);
10167 specs->decl_attr = DECL_ATTRIBUTES (type);
10168 specs->typedef_p = true;
10169 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
10170 specs->locations[cdw_typedef] = loc;
10172 /* If this typedef name is defined in a struct, then a C++
10173 lookup would return a different value. */
10174 if (warn_cxx_compat
10175 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
10176 warning_at (loc, OPT_Wc___compat,
10177 "C++ lookup of %qD would return a field, not a type",
10180 /* If we are parsing a struct, record that a struct field
10182 if (warn_cxx_compat && struct_parse_info != NULL)
10183 struct_parse_info->typedefs_seen.safe_push (type);
10186 else if (TREE_CODE (type) == IDENTIFIER_NODE)
10188 tree t = lookup_name (type);
10189 if (!t || TREE_CODE (t) != TYPE_DECL)
10190 error_at (loc, "%qE fails to be a typedef or built in type", type);
10191 else if (TREE_TYPE (t) == error_mark_node)
10195 specs->type = TREE_TYPE (t);
10196 specs->locations[cdw_typespec] = loc;
10201 if (TREE_CODE (type) != ERROR_MARK && spec.kind == ctsk_typeof)
10203 specs->typedef_p = true;
10204 specs->locations[cdw_typedef] = loc;
10208 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
10209 specs->expr, spec.expr);
10211 specs->expr = spec.expr;
10212 specs->expr_const_operands &= spec.expr_const_operands;
10215 specs->type = type;
10221 /* Add the storage class specifier or function specifier SCSPEC to the
10222 declaration specifiers SPECS, returning SPECS. */
10224 struct c_declspecs *
10225 declspecs_add_scspec (source_location loc,
10226 struct c_declspecs *specs,
10230 enum c_storage_class n = csc_none;
10232 specs->declspecs_seen_p = true;
10233 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
10234 && C_IS_RESERVED_WORD (scspec));
10235 i = C_RID_CODE (scspec);
10236 if (specs->non_sc_seen_p)
10237 warning (OPT_Wold_style_declaration,
10238 "%qE is not at beginning of declaration", scspec);
10242 /* C99 permits duplicate inline. Although of doubtful utility,
10243 it seems simplest to permit it in gnu89 mode as well, as
10244 there is also little utility in maintaining this as a
10245 difference between gnu89 and C99 inline. */
10247 specs->inline_p = true;
10248 specs->locations[cdw_inline] = loc;
10251 /* Duplicate _Noreturn is permitted. */
10253 specs->noreturn_p = true;
10254 specs->locations[cdw_noreturn] = loc;
10257 dupe = specs->thread_p;
10258 if (specs->storage_class == csc_auto)
10259 error ("%qE used with %<auto%>", scspec);
10260 else if (specs->storage_class == csc_register)
10261 error ("%qE used with %<register%>", scspec);
10262 else if (specs->storage_class == csc_typedef)
10263 error ("%qE used with %<typedef%>", scspec);
10266 specs->thread_p = true;
10267 specs->thread_gnu_p = (strcmp (IDENTIFIER_POINTER (scspec),
10269 /* A diagnostic is not required for the use of this
10270 identifier in the implementation namespace; only diagnose
10271 it for the C11 spelling because of existing code using
10272 the other spelling. */
10273 if (!specs->thread_gnu_p)
10276 pedwarn_c99 (loc, OPT_Wpedantic,
10277 "ISO C99 does not support %qE", scspec);
10279 pedwarn_c99 (loc, OPT_Wpedantic,
10280 "ISO C90 does not support %qE", scspec);
10282 specs->locations[cdw_thread] = loc;
10290 /* Diagnose "__thread extern". */
10291 if (specs->thread_p && specs->thread_gnu_p)
10292 error ("%<__thread%> before %<extern%>");
10299 /* Diagnose "__thread static". */
10300 if (specs->thread_p && specs->thread_gnu_p)
10301 error ("%<__thread%> before %<static%>");
10307 gcc_unreachable ();
10309 if (n != csc_none && n == specs->storage_class)
10313 if (i == RID_THREAD)
10314 error ("duplicate %<_Thread_local%> or %<__thread%>");
10316 error ("duplicate %qE", scspec);
10320 if (specs->storage_class != csc_none && n != specs->storage_class)
10322 error ("multiple storage classes in declaration specifiers");
10326 specs->storage_class = n;
10327 specs->locations[cdw_storage_class] = loc;
10328 if (n != csc_extern && n != csc_static && specs->thread_p)
10330 error ("%qs used with %qE",
10331 specs->thread_gnu_p ? "__thread" : "_Thread_local",
10333 specs->thread_p = false;
10340 /* Add the attributes ATTRS to the declaration specifiers SPECS,
10341 returning SPECS. */
10343 struct c_declspecs *
10344 declspecs_add_attrs (source_location loc, struct c_declspecs *specs, tree attrs)
10346 specs->attrs = chainon (attrs, specs->attrs);
10347 specs->locations[cdw_attributes] = loc;
10348 specs->declspecs_seen_p = true;
10352 /* Add an _Alignas specifier (expression ALIGN, or type whose
10353 alignment is ALIGN) to the declaration specifiers SPECS, returning
10355 struct c_declspecs *
10356 declspecs_add_alignas (source_location loc,
10357 struct c_declspecs *specs, tree align)
10360 specs->alignas_p = true;
10361 specs->locations[cdw_alignas] = loc;
10362 if (align == error_mark_node)
10364 align_log = check_user_alignment (align, true);
10365 if (align_log > specs->align_log)
10366 specs->align_log = align_log;
10370 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10371 specifiers with any other type specifier to determine the resulting
10372 type. This is where ISO C checks on complex types are made, since
10373 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10376 struct c_declspecs *
10377 finish_declspecs (struct c_declspecs *specs)
10379 /* If a type was specified as a whole, we have no modifiers and are
10381 if (specs->type != NULL_TREE)
10383 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
10384 && !specs->signed_p && !specs->unsigned_p
10385 && !specs->complex_p);
10387 /* Set a dummy type. */
10388 if (TREE_CODE (specs->type) == ERROR_MARK)
10389 specs->type = integer_type_node;
10393 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10394 has been specified, treat it as "int" unless "_Complex" is
10395 present and there are no other specifiers. If we just have
10396 "_Complex", it is equivalent to "_Complex double", but e.g.
10397 "_Complex short" is equivalent to "_Complex short int". */
10398 if (specs->typespec_word == cts_none)
10400 if (specs->saturating_p)
10402 error_at (specs->locations[cdw_saturating],
10403 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10404 if (!targetm.fixed_point_supported_p ())
10405 error_at (specs->locations[cdw_saturating],
10406 "fixed-point types not supported for this target");
10407 specs->typespec_word = cts_fract;
10409 else if (specs->long_p || specs->short_p
10410 || specs->signed_p || specs->unsigned_p)
10412 specs->typespec_word = cts_int;
10414 else if (specs->complex_p)
10416 specs->typespec_word = cts_double;
10417 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10418 "ISO C does not support plain %<complex%> meaning "
10419 "%<double complex%>");
10423 specs->typespec_word = cts_int;
10424 specs->default_int_p = true;
10425 /* We don't diagnose this here because grokdeclarator will
10426 give more specific diagnostics according to whether it is
10427 a function definition. */
10431 /* If "signed" was specified, record this to distinguish "int" and
10432 "signed int" in the case of a bit-field with
10433 -funsigned-bitfields. */
10434 specs->explicit_signed_p = specs->signed_p;
10436 /* Now compute the actual type. */
10437 switch (specs->typespec_word)
10439 case cts_auto_type:
10440 gcc_assert (!specs->long_p && !specs->short_p
10441 && !specs->signed_p && !specs->unsigned_p
10442 && !specs->complex_p);
10443 /* Type to be filled in later. */
10446 gcc_assert (!specs->long_p && !specs->short_p
10447 && !specs->signed_p && !specs->unsigned_p
10448 && !specs->complex_p);
10449 specs->type = void_type_node;
10452 gcc_assert (!specs->long_p && !specs->short_p
10453 && !specs->signed_p && !specs->unsigned_p
10454 && !specs->complex_p);
10455 specs->type = boolean_type_node;
10458 gcc_assert (!specs->long_p && !specs->short_p);
10459 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10460 if (specs->signed_p)
10461 specs->type = signed_char_type_node;
10462 else if (specs->unsigned_p)
10463 specs->type = unsigned_char_type_node;
10465 specs->type = char_type_node;
10466 if (specs->complex_p)
10468 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10469 "ISO C does not support complex integer types");
10470 specs->type = build_complex_type (specs->type);
10474 gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p);
10475 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10476 specs->type = (specs->unsigned_p
10477 ? int_n_trees[specs->int_n_idx].unsigned_type
10478 : int_n_trees[specs->int_n_idx].signed_type);
10479 if (specs->complex_p)
10481 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10482 "ISO C does not support complex integer types");
10483 specs->type = build_complex_type (specs->type);
10487 gcc_assert (!(specs->long_p && specs->short_p));
10488 gcc_assert (!(specs->signed_p && specs->unsigned_p));
10489 if (specs->long_long_p)
10490 specs->type = (specs->unsigned_p
10491 ? long_long_unsigned_type_node
10492 : long_long_integer_type_node);
10493 else if (specs->long_p)
10494 specs->type = (specs->unsigned_p
10495 ? long_unsigned_type_node
10496 : long_integer_type_node);
10497 else if (specs->short_p)
10498 specs->type = (specs->unsigned_p
10499 ? short_unsigned_type_node
10500 : short_integer_type_node);
10502 specs->type = (specs->unsigned_p
10503 ? unsigned_type_node
10504 : integer_type_node);
10505 if (specs->complex_p)
10507 pedwarn (specs->locations[cdw_complex], OPT_Wpedantic,
10508 "ISO C does not support complex integer types");
10509 specs->type = build_complex_type (specs->type);
10513 gcc_assert (!specs->long_p && !specs->short_p
10514 && !specs->signed_p && !specs->unsigned_p);
10515 specs->type = (specs->complex_p
10516 ? complex_float_type_node
10517 : float_type_node);
10520 gcc_assert (!specs->long_long_p && !specs->short_p
10521 && !specs->signed_p && !specs->unsigned_p);
10524 specs->type = (specs->complex_p
10525 ? complex_long_double_type_node
10526 : long_double_type_node);
10530 specs->type = (specs->complex_p
10531 ? complex_double_type_node
10532 : double_type_node);
10537 case cts_dfloat128:
10538 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
10539 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
10540 if (specs->typespec_word == cts_dfloat32)
10541 specs->type = dfloat32_type_node;
10542 else if (specs->typespec_word == cts_dfloat64)
10543 specs->type = dfloat64_type_node;
10545 specs->type = dfloat128_type_node;
10548 gcc_assert (!specs->complex_p);
10549 if (!targetm.fixed_point_supported_p ())
10550 specs->type = integer_type_node;
10551 else if (specs->saturating_p)
10553 if (specs->long_long_p)
10554 specs->type = specs->unsigned_p
10555 ? sat_unsigned_long_long_fract_type_node
10556 : sat_long_long_fract_type_node;
10557 else if (specs->long_p)
10558 specs->type = specs->unsigned_p
10559 ? sat_unsigned_long_fract_type_node
10560 : sat_long_fract_type_node;
10561 else if (specs->short_p)
10562 specs->type = specs->unsigned_p
10563 ? sat_unsigned_short_fract_type_node
10564 : sat_short_fract_type_node;
10566 specs->type = specs->unsigned_p
10567 ? sat_unsigned_fract_type_node
10568 : sat_fract_type_node;
10572 if (specs->long_long_p)
10573 specs->type = specs->unsigned_p
10574 ? unsigned_long_long_fract_type_node
10575 : long_long_fract_type_node;
10576 else if (specs->long_p)
10577 specs->type = specs->unsigned_p
10578 ? unsigned_long_fract_type_node
10579 : long_fract_type_node;
10580 else if (specs->short_p)
10581 specs->type = specs->unsigned_p
10582 ? unsigned_short_fract_type_node
10583 : short_fract_type_node;
10585 specs->type = specs->unsigned_p
10586 ? unsigned_fract_type_node
10591 gcc_assert (!specs->complex_p);
10592 if (!targetm.fixed_point_supported_p ())
10593 specs->type = integer_type_node;
10594 else if (specs->saturating_p)
10596 if (specs->long_long_p)
10597 specs->type = specs->unsigned_p
10598 ? sat_unsigned_long_long_accum_type_node
10599 : sat_long_long_accum_type_node;
10600 else if (specs->long_p)
10601 specs->type = specs->unsigned_p
10602 ? sat_unsigned_long_accum_type_node
10603 : sat_long_accum_type_node;
10604 else if (specs->short_p)
10605 specs->type = specs->unsigned_p
10606 ? sat_unsigned_short_accum_type_node
10607 : sat_short_accum_type_node;
10609 specs->type = specs->unsigned_p
10610 ? sat_unsigned_accum_type_node
10611 : sat_accum_type_node;
10615 if (specs->long_long_p)
10616 specs->type = specs->unsigned_p
10617 ? unsigned_long_long_accum_type_node
10618 : long_long_accum_type_node;
10619 else if (specs->long_p)
10620 specs->type = specs->unsigned_p
10621 ? unsigned_long_accum_type_node
10622 : long_accum_type_node;
10623 else if (specs->short_p)
10624 specs->type = specs->unsigned_p
10625 ? unsigned_short_accum_type_node
10626 : short_accum_type_node;
10628 specs->type = specs->unsigned_p
10629 ? unsigned_accum_type_node
10634 gcc_unreachable ();
10640 /* A subroutine of c_write_global_declarations. Perform final processing
10641 on one file scope's declarations (or the external scope's declarations),
10645 c_write_global_declarations_1 (tree globals)
10650 /* Process the decls in the order they were written. */
10651 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10653 /* Check for used but undefined static functions using the C
10654 standard's definition of "used", and set TREE_NO_WARNING so
10655 that check_global_declarations doesn't repeat the check. */
10656 if (TREE_CODE (decl) == FUNCTION_DECL
10657 && DECL_INITIAL (decl) == 0
10658 && DECL_EXTERNAL (decl)
10659 && !TREE_PUBLIC (decl)
10660 && C_DECL_USED (decl))
10662 pedwarn (input_location, 0, "%q+F used but never defined", decl);
10663 TREE_NO_WARNING (decl) = 1;
10666 wrapup_global_declaration_1 (decl);
10671 reconsider = false;
10672 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10673 reconsider |= wrapup_global_declaration_2 (decl);
10675 while (reconsider);
10677 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10678 check_global_declaration_1 (decl);
10681 /* A subroutine of c_write_global_declarations Emit debug information for each
10682 of the declarations in GLOBALS. */
10685 c_write_global_declarations_2 (tree globals)
10689 for (decl = globals; decl ; decl = DECL_CHAIN (decl))
10690 debug_hooks->global_decl (decl);
10693 /* Callback to collect a source_ref from a DECL. */
10696 collect_source_ref_cb (tree decl)
10698 if (!DECL_IS_BUILTIN (decl))
10699 collect_source_ref (LOCATION_FILE (decl_sloc (decl, false)));
10702 /* Preserve the external declarations scope across a garbage collect. */
10703 static GTY(()) tree ext_block;
10705 /* Collect all references relevant to SOURCE_FILE. */
10708 collect_all_refs (const char *source_file)
10713 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10714 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file);
10716 collect_ada_nodes (BLOCK_VARS (ext_block), source_file);
10719 /* Iterate over all global declarations and call CALLBACK. */
10722 for_each_global_decl (void (*callback) (tree decl))
10729 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10731 decls = DECL_INITIAL (t);
10732 for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl))
10736 for (decl = BLOCK_VARS (ext_block); decl; decl = TREE_CHAIN (decl))
10741 c_write_global_declarations (void)
10746 /* We don't want to do this if generating a PCH. */
10750 timevar_start (TV_PHASE_DEFERRED);
10752 /* Do the Objective-C stuff. This is where all the Objective-C
10753 module stuff gets generated (symtab, class/protocol/selector
10755 if (c_dialect_objc ())
10756 objc_write_global_declarations ();
10758 /* Close the external scope. */
10759 ext_block = pop_scope ();
10760 external_scope = 0;
10761 gcc_assert (!current_scope);
10763 /* Handle -fdump-ada-spec[-slim]. */
10764 if (flag_dump_ada_spec || flag_dump_ada_spec_slim)
10766 /* Build a table of files to generate specs for */
10767 if (flag_dump_ada_spec_slim)
10768 collect_source_ref (main_input_filename);
10770 for_each_global_decl (collect_source_ref_cb);
10772 dump_ada_specs (collect_all_refs, NULL);
10777 tree tmp = BLOCK_VARS (ext_block);
10779 FILE * stream = dump_begin (TDI_tu, &flags);
10782 dump_node (tmp, flags & ~TDF_SLIM, stream);
10783 dump_end (TDI_tu, stream);
10787 /* Process all file scopes in this compilation, and the external_scope,
10788 through wrapup_global_declarations and check_global_declarations. */
10789 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10790 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
10791 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
10793 timevar_stop (TV_PHASE_DEFERRED);
10794 timevar_start (TV_PHASE_OPT_GEN);
10796 /* We're done parsing; proceed to optimize and emit assembly.
10797 FIXME: shouldn't be the front end's responsibility to call this. */
10798 symtab->finalize_compilation_unit ();
10800 timevar_stop (TV_PHASE_OPT_GEN);
10801 timevar_start (TV_PHASE_DBGINFO);
10803 /* After cgraph has had a chance to emit everything that's going to
10804 be emitted, output debug information for globals. */
10805 if (!seen_error ())
10807 timevar_push (TV_SYMOUT);
10808 FOR_EACH_VEC_ELT (*all_translation_units, i, t)
10809 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
10810 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
10811 timevar_pop (TV_SYMOUT);
10815 timevar_stop (TV_PHASE_DBGINFO);
10818 /* Register reserved keyword WORD as qualifier for address space AS. */
10821 c_register_addr_space (const char *word, addr_space_t as)
10823 int rid = RID_FIRST_ADDR_SPACE + as;
10826 /* Address space qualifiers are only supported
10827 in C with GNU extensions enabled. */
10828 if (c_dialect_objc () || flag_no_asm)
10831 id = get_identifier (word);
10832 C_SET_RID_CODE (id, rid);
10833 C_IS_RESERVED_WORD (id) = 1;
10834 ridpointers [rid] = id;
10837 /* Return identifier to look up for omp declare reduction. */
10840 c_omp_reduction_id (enum tree_code reduction_code, tree reduction_id)
10842 const char *p = NULL;
10843 switch (reduction_code)
10845 case PLUS_EXPR: p = "+"; break;
10846 case MULT_EXPR: p = "*"; break;
10847 case MINUS_EXPR: p = "-"; break;
10848 case BIT_AND_EXPR: p = "&"; break;
10849 case BIT_XOR_EXPR: p = "^"; break;
10850 case BIT_IOR_EXPR: p = "|"; break;
10851 case TRUTH_ANDIF_EXPR: p = "&&"; break;
10852 case TRUTH_ORIF_EXPR: p = "||"; break;
10853 case MIN_EXPR: p = "min"; break;
10854 case MAX_EXPR: p = "max"; break;
10861 if (TREE_CODE (reduction_id) != IDENTIFIER_NODE)
10862 return error_mark_node;
10863 p = IDENTIFIER_POINTER (reduction_id);
10866 const char prefix[] = "omp declare reduction ";
10867 size_t lenp = sizeof (prefix);
10868 size_t len = strlen (p);
10869 char *name = XALLOCAVEC (char, lenp + len);
10870 memcpy (name, prefix, lenp - 1);
10871 memcpy (name + lenp - 1, p, len + 1);
10872 return get_identifier (name);
10875 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10876 VAR_DECL, bind it into the current scope and return it. */
10879 c_omp_reduction_decl (tree reduction_id)
10881 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
10882 if (b != NULL && B_IN_CURRENT_SCOPE (b))
10885 tree decl = build_decl (BUILTINS_LOCATION, VAR_DECL,
10886 reduction_id, integer_type_node);
10887 DECL_ARTIFICIAL (decl) = 1;
10888 DECL_EXTERNAL (decl) = 1;
10889 TREE_STATIC (decl) = 1;
10890 TREE_PUBLIC (decl) = 0;
10891 bind (reduction_id, decl, current_scope, true, false, BUILTINS_LOCATION);
10895 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10898 c_omp_reduction_lookup (tree reduction_id, tree type)
10900 struct c_binding *b = I_SYMBOL_BINDING (reduction_id);
10904 for (t = DECL_INITIAL (b->decl); t; t = TREE_CHAIN (t))
10905 if (comptypes (TREE_PURPOSE (t), type))
10906 return TREE_VALUE (t);
10909 return error_mark_node;
10912 /* Helper function called via walk_tree, to diagnose invalid
10913 #pragma omp declare reduction combiners or initializers. */
10916 c_check_omp_declare_reduction_r (tree *tp, int *, void *data)
10918 tree *vars = (tree *) data;
10919 if (SSA_VAR_P (*tp)
10920 && !DECL_ARTIFICIAL (*tp)
10924 location_t loc = DECL_SOURCE_LOCATION (vars[0]);
10925 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars[0])), "omp_out") == 0)
10926 error_at (loc, "%<#pragma omp declare reduction%> combiner refers to "
10927 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10930 error_at (loc, "%<#pragma omp declare reduction%> initializer refers "
10931 "to variable %qD which is not %<omp_priv%> nor "
10939 #include "gt-c-c-decl.h"