1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
36 #include "tree-inline.h"
48 #include "c-family/c-common.h"
49 #include "c-family/c-pragma.h"
51 #include "langhooks.h"
52 #include "tree-mudflap.h"
53 #include "tree-iterator.h"
54 #include "diagnostic-core.h"
55 #include "tree-dump.h"
58 #include "langhooks-def.h"
59 #include "pointer-set.h"
61 #include "c-family/c-ada-spec.h"
63 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
65 { NORMAL, /* Ordinary declaration */
66 FUNCDEF, /* Function definition */
67 PARM, /* Declaration of parm before function body */
68 FIELD, /* Declaration inside struct or union */
69 TYPENAME}; /* Typename (inside cast or sizeof) */
71 /* States indicating how grokdeclarator() should handle declspecs marked
72 with __attribute__((deprecated)). An object declared as
73 __attribute__((deprecated)) suppresses warnings of uses of other
76 enum deprecated_states {
82 /* Nonzero if we have seen an invalid cross reference
83 to a struct, union, or enum, but not yet printed the message. */
84 tree pending_invalid_xref;
86 /* File and line to appear in the eventual error message. */
87 location_t pending_invalid_xref_location;
89 /* The file and line that the prototype came from if this is an
90 old-style definition; used for diagnostics in
91 store_parm_decls_oldstyle. */
93 static location_t current_function_prototype_locus;
95 /* Whether this prototype was built-in. */
97 static bool current_function_prototype_built_in;
99 /* The argument type information of this prototype. */
101 static tree current_function_prototype_arg_types;
103 /* The argument information structure for the function currently being
106 static struct c_arg_info *current_function_arg_info;
108 /* The obstack on which parser and related data structures, which are
109 not live beyond their top-level declaration or definition, are
111 struct obstack parser_obstack;
113 /* The current statement tree. */
115 static GTY(()) struct stmt_tree_s c_stmt_tree;
117 /* State saving variables. */
121 /* A list of decls to be made automatically visible in each file scope. */
122 static GTY(()) tree visible_builtins;
124 /* Set to 0 at beginning of a function definition, set to 1 if
125 a return statement that specifies a return value is seen. */
127 int current_function_returns_value;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement with no argument is seen. */
132 int current_function_returns_null;
134 /* Set to 0 at beginning of a function definition, set to 1 if
135 a call to a noreturn function is seen. */
137 int current_function_returns_abnormally;
139 /* Set to nonzero by `grokdeclarator' for a function
140 whose return type is defaulted, if warnings for this are desired. */
142 static int warn_about_return_type;
144 /* Nonzero when the current toplevel function contains a declaration
145 of a nested function which is never defined. */
147 static bool undef_nested_function;
149 /* True means global_bindings_p should return false even if the scope stack
150 says we are in file scope. */
151 bool c_override_global_bindings_to_false;
154 /* Each c_binding structure describes one binding of an identifier to
155 a decl. All the decls in a scope - irrespective of namespace - are
156 chained together by the ->prev field, which (as the name implies)
157 runs in reverse order. All the decls in a given namespace bound to
158 a given identifier are chained by the ->shadowed field, which runs
159 from inner to outer scopes.
161 The ->decl field usually points to a DECL node, but there are two
162 exceptions. In the namespace of type tags, the bound entity is a
163 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
164 identifier is encountered, it is bound to error_mark_node to
165 suppress further errors about that identifier in the current
168 The ->u.type field stores the type of the declaration in this scope;
169 if NULL, the type is the type of the ->decl field. This is only of
170 relevance for objects with external or internal linkage which may
171 be redeclared in inner scopes, forming composite types that only
172 persist for the duration of those scopes. In the external scope,
173 this stores the composite of all the types declared for this
174 object, visible or not. The ->inner_comp field (used only at file
175 scope) stores whether an incomplete array type at file scope was
176 completed at an inner scope to an array size other than 1.
178 The ->u.label field is used for labels. It points to a structure
179 which stores additional information used for warnings.
181 The depth field is copied from the scope structure that holds this
182 decl. It is used to preserve the proper ordering of the ->shadowed
183 field (see bind()) and also for a handful of special-case checks.
184 Finally, the invisible bit is true for a decl which should be
185 ignored for purposes of normal name lookup, and the nested bit is
186 true for a decl that's been bound a second time in an inner scope;
187 in all such cases, the binding in the outer scope will have its
188 invisible bit true. */
190 struct GTY((chain_next ("%h.prev"))) c_binding {
191 union GTY(()) { /* first so GTY desc can use decl */
192 tree GTY((tag ("0"))) type; /* the type in this scope */
193 struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */
194 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u;
195 tree decl; /* the decl bound */
196 tree id; /* the identifier it's bound to */
197 struct c_binding *prev; /* the previous decl in this scope */
198 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
199 unsigned int depth : 28; /* depth of this scope */
200 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
201 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
202 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
203 BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */
204 location_t locus; /* location for nested bindings */
206 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
207 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
208 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
209 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
211 #define I_SYMBOL_BINDING(node) \
212 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
213 #define I_SYMBOL_DECL(node) \
214 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
216 #define I_TAG_BINDING(node) \
217 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
218 #define I_TAG_DECL(node) \
219 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
221 #define I_LABEL_BINDING(node) \
222 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
223 #define I_LABEL_DECL(node) \
224 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
226 /* Each C symbol points to three linked lists of c_binding structures.
227 These describe the values of the identifier in the three different
228 namespaces defined by the language. */
230 struct GTY(()) lang_identifier {
231 struct c_common_identifier common_id;
232 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
233 struct c_binding *tag_binding; /* struct/union/enum tags */
234 struct c_binding *label_binding; /* labels */
237 /* Validate c-lang.c's assumptions. */
238 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
239 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
241 /* The resulting tree type. */
243 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
244 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) TREE_CHAIN (&%h.generic))"))) lang_tree_node
246 union tree_node GTY ((tag ("0"),
247 desc ("tree_node_structure (&%h)")))
249 struct lang_identifier GTY ((tag ("1"))) identifier;
252 /* Track bindings and other things that matter for goto warnings. For
253 efficiency, we do not gather all the decls at the point of
254 definition. Instead, we point into the bindings structure. As
255 scopes are popped, we update these structures and gather the decls
256 that matter at that time. */
258 struct GTY(()) c_spot_bindings {
259 /* The currently open scope which holds bindings defined when the
260 label was defined or the goto statement was found. */
261 struct c_scope *scope;
262 /* The bindings in the scope field which were defined at the point
263 of the label or goto. This lets us look at older or newer
264 bindings in the scope, as appropriate. */
265 struct c_binding *bindings_in_scope;
266 /* The number of statement expressions that have started since this
267 label or goto statement was defined. This is zero if we are at
268 the same statement expression level. It is positive if we are in
269 a statement expression started since this spot. It is negative
270 if this spot was in a statement expression and we have left
273 /* Whether we started in a statement expression but are no longer in
274 it. This is set to true if stmt_exprs ever goes negative. */
278 /* This structure is used to keep track of bindings seen when a goto
279 statement is defined. This is only used if we see the goto
280 statement before we see the label. */
282 struct GTY(()) c_goto_bindings {
283 /* The location of the goto statement. */
285 /* The bindings of the goto statement. */
286 struct c_spot_bindings goto_bindings;
289 typedef struct c_goto_bindings *c_goto_bindings_p;
290 DEF_VEC_P(c_goto_bindings_p);
291 DEF_VEC_ALLOC_P(c_goto_bindings_p,gc);
293 /* The additional information we keep track of for a label binding.
294 These fields are updated as scopes are popped. */
296 struct GTY(()) c_label_vars {
297 /* The shadowed c_label_vars, when one label shadows another (which
298 can only happen using a __label__ declaration). */
299 struct c_label_vars *shadowed;
300 /* The bindings when the label was defined. */
301 struct c_spot_bindings label_bindings;
302 /* A list of decls that we care about: decls about which we should
303 warn if a goto branches to this label from later in the function.
304 Decls are added to this list as scopes are popped. We only add
305 the decls that matter. */
306 VEC(tree,gc) *decls_in_scope;
307 /* A list of goto statements to this label. This is only used for
308 goto statements seen before the label was defined, so that we can
309 issue appropriate warnings for them. */
310 VEC(c_goto_bindings_p,gc) *gotos;
313 /* Each c_scope structure describes the complete contents of one
314 scope. Four scopes are distinguished specially: the innermost or
315 current scope, the innermost function scope, the file scope (always
316 the second to outermost) and the outermost or external scope.
318 Most declarations are recorded in the current scope.
320 All normal label declarations are recorded in the innermost
321 function scope, as are bindings of undeclared identifiers to
322 error_mark_node. (GCC permits nested functions as an extension,
323 hence the 'innermost' qualifier.) Explicitly declared labels
324 (using the __label__ extension) appear in the current scope.
326 Being in the file scope (current_scope == file_scope) causes
327 special behavior in several places below. Also, under some
328 conditions the Objective-C front end records declarations in the
329 file scope even though that isn't the current scope.
331 All declarations with external linkage are recorded in the external
332 scope, even if they aren't visible there; this models the fact that
333 such declarations are visible to the entire program, and (with a
334 bit of cleverness, see pushdecl) allows diagnosis of some violations
335 of C99 6.2.2p7 and 6.2.7p2:
337 If, within the same translation unit, the same identifier appears
338 with both internal and external linkage, the behavior is
341 All declarations that refer to the same object or function shall
342 have compatible type; otherwise, the behavior is undefined.
344 Initially only the built-in declarations, which describe compiler
345 intrinsic functions plus a subset of the standard library, are in
348 The order of the blocks list matters, and it is frequently appended
349 to. To avoid having to walk all the way to the end of the list on
350 each insertion, or reverse the list later, we maintain a pointer to
351 the last list entry. (FIXME: It should be feasible to use a reversed
354 The bindings list is strictly in reverse order of declarations;
355 pop_scope relies on this. */
358 struct GTY((chain_next ("%h.outer"))) c_scope {
359 /* The scope containing this one. */
360 struct c_scope *outer;
362 /* The next outermost function scope. */
363 struct c_scope *outer_function;
365 /* All bindings in this scope. */
366 struct c_binding *bindings;
368 /* For each scope (except the global one), a chain of BLOCK nodes
369 for all the scopes that were entered and exited one level down. */
373 /* The depth of this scope. Used to keep the ->shadowed chain of
374 bindings sorted innermost to outermost. */
375 unsigned int depth : 28;
377 /* True if we are currently filling this scope with parameter
379 BOOL_BITFIELD parm_flag : 1;
381 /* True if we saw [*] in this scope. Used to give an error messages
382 if these appears in a function definition. */
383 BOOL_BITFIELD had_vla_unspec : 1;
385 /* True if we already complained about forward parameter decls
386 in this scope. This prevents double warnings on
387 foo (int a; int b; ...) */
388 BOOL_BITFIELD warned_forward_parm_decls : 1;
390 /* True if this is the outermost block scope of a function body.
391 This scope contains the parameters, the local variables declared
392 in the outermost block, and all the labels (except those in
393 nested functions, or declared at block scope with __label__). */
394 BOOL_BITFIELD function_body : 1;
396 /* True means make a BLOCK for this scope no matter what. */
397 BOOL_BITFIELD keep : 1;
399 /* True means that an unsuffixed float constant is _Decimal64. */
400 BOOL_BITFIELD float_const_decimal64 : 1;
402 /* True if this scope has any label bindings. This is used to speed
403 up searching for labels when popping scopes, particularly since
404 labels are normally only found at function scope. */
405 BOOL_BITFIELD has_label_bindings : 1;
408 /* The scope currently in effect. */
410 static GTY(()) struct c_scope *current_scope;
412 /* The innermost function scope. Ordinary (not explicitly declared)
413 labels, bindings to error_mark_node, and the lazily-created
414 bindings of __func__ and its friends get this scope. */
416 static GTY(()) struct c_scope *current_function_scope;
418 /* The C file scope. This is reset for each input translation unit. */
420 static GTY(()) struct c_scope *file_scope;
422 /* The outermost scope. This is used for all declarations with
423 external linkage, and only these, hence the name. */
425 static GTY(()) struct c_scope *external_scope;
427 /* A chain of c_scope structures awaiting reuse. */
429 static GTY((deletable)) struct c_scope *scope_freelist;
431 /* A chain of c_binding structures awaiting reuse. */
433 static GTY((deletable)) struct c_binding *binding_freelist;
435 /* Append VAR to LIST in scope SCOPE. */
436 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
437 struct c_scope *s_ = (scope); \
439 if (s_->list##_last) \
440 BLOCK_CHAIN (s_->list##_last) = d_; \
443 s_->list##_last = d_; \
446 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
447 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
448 struct c_scope *t_ = (tscope); \
449 struct c_scope *f_ = (fscope); \
451 BLOCK_CHAIN (t_->to##_last) = f_->from; \
454 t_->to##_last = f_->from##_last; \
457 /* A c_inline_static structure stores details of a static identifier
458 referenced in a definition of a function that may be an inline
459 definition if no subsequent declaration of that function uses
460 "extern" or does not use "inline". */
462 struct GTY((chain_next ("%h.next"))) c_inline_static {
463 /* The location for a diagnostic. */
466 /* The function that may be an inline definition. */
469 /* The object or function referenced. */
472 /* What sort of reference this is. */
473 enum c_inline_static_type type;
475 /* The next such structure or NULL. */
476 struct c_inline_static *next;
479 /* List of static identifiers used or referenced in functions that may
480 be inline definitions. */
481 static GTY(()) struct c_inline_static *c_inline_statics;
483 /* True means unconditionally make a BLOCK for the next scope pushed. */
485 static bool keep_next_level_flag;
487 /* True means the next call to push_scope will be the outermost scope
488 of a function body, so do not push a new scope, merely cease
489 expecting parameter decls. */
491 static bool next_is_function_body;
493 /* A VEC of pointers to c_binding structures. */
495 typedef struct c_binding *c_binding_ptr;
496 DEF_VEC_P(c_binding_ptr);
497 DEF_VEC_ALLOC_P(c_binding_ptr,heap);
499 /* Information that we keep for a struct or union while it is being
502 struct c_struct_parse_info
504 /* If warn_cxx_compat, a list of types defined within this
506 VEC(tree,heap) *struct_types;
507 /* If warn_cxx_compat, a list of field names which have bindings,
508 and which are defined in this struct, but which are not defined
509 in any enclosing struct. This is used to clear the in_struct
510 field of the c_bindings structure. */
511 VEC(c_binding_ptr,heap) *fields;
512 /* If warn_cxx_compat, a list of typedef names used when defining
513 fields in this struct. */
514 VEC(tree,heap) *typedefs_seen;
517 /* Information for the struct or union currently being parsed, or
518 NULL if not parsing a struct or union. */
519 static struct c_struct_parse_info *struct_parse_info;
521 /* Forward declarations. */
522 static tree lookup_name_in_scope (tree, struct c_scope *);
523 static tree c_make_fname_decl (location_t, tree, int);
524 static tree grokdeclarator (const struct c_declarator *,
525 struct c_declspecs *,
526 enum decl_context, bool, tree *, tree *, tree *,
527 bool *, enum deprecated_states);
528 static tree grokparms (struct c_arg_info *, bool);
529 static void layout_array_type (tree);
531 /* T is a statement. Add it to the statement-tree. This is the
532 C/ObjC version--C++ has a slightly different version of this
538 enum tree_code code = TREE_CODE (t);
540 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
542 if (!EXPR_HAS_LOCATION (t))
543 SET_EXPR_LOCATION (t, input_location);
546 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
547 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
549 /* Add T to the statement-tree. Non-side-effect statements need to be
550 recorded during statement expressions. */
551 append_to_statement_list_force (t, &cur_stmt_list);
558 c_print_identifier (FILE *file, tree node, int indent)
560 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
561 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
562 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
563 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
565 tree rid = ridpointers[C_RID_CODE (node)];
566 indent_to (file, indent + 4);
567 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
568 (void *) rid, IDENTIFIER_POINTER (rid));
572 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
573 which may be any of several kinds of DECL or TYPE or error_mark_node,
574 in the scope SCOPE. */
576 bind (tree name, tree decl, struct c_scope *scope, bool invisible,
577 bool nested, location_t locus)
579 struct c_binding *b, **here;
581 if (binding_freelist)
583 b = binding_freelist;
584 binding_freelist = b->prev;
587 b = ggc_alloc_c_binding ();
592 b->depth = scope->depth;
593 b->invisible = invisible;
601 b->prev = scope->bindings;
607 switch (TREE_CODE (decl))
609 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
612 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
618 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
624 /* Locate the appropriate place in the chain of shadowed decls
625 to insert this binding. Normally, scope == current_scope and
626 this does nothing. */
627 while (*here && (*here)->depth > scope->depth)
628 here = &(*here)->shadowed;
634 /* Clear the binding structure B, stick it on the binding_freelist,
635 and return the former value of b->prev. This is used by pop_scope
636 and get_parm_info to iterate destructively over all the bindings
637 from a given scope. */
638 static struct c_binding *
639 free_binding_and_advance (struct c_binding *b)
641 struct c_binding *prev = b->prev;
643 memset (b, 0, sizeof (struct c_binding));
644 b->prev = binding_freelist;
645 binding_freelist = b;
650 /* Bind a label. Like bind, but skip fields which aren't used for
651 labels, and add the LABEL_VARS value. */
653 bind_label (tree name, tree label, struct c_scope *scope,
654 struct c_label_vars *label_vars)
658 bind (name, label, scope, /*invisible=*/false, /*nested=*/false,
661 scope->has_label_bindings = true;
664 gcc_assert (b->decl == label);
665 label_vars->shadowed = b->u.label;
666 b->u.label = label_vars;
669 /* Hook called at end of compilation to assume 1 elt
670 for a file-scope tentative array defn that wasn't complete before. */
673 c_finish_incomplete_decl (tree decl)
675 if (TREE_CODE (decl) == VAR_DECL)
677 tree type = TREE_TYPE (decl);
678 if (type != error_mark_node
679 && TREE_CODE (type) == ARRAY_TYPE
680 && !DECL_EXTERNAL (decl)
681 && TYPE_DOMAIN (type) == 0)
683 warning_at (DECL_SOURCE_LOCATION (decl),
684 0, "array %q+D assumed to have one element", decl);
686 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
688 layout_decl (decl, 0);
693 /* Record that inline function FUNC contains a reference (location
694 LOC) to static DECL (file-scope or function-local according to
698 record_inline_static (location_t loc, tree func, tree decl,
699 enum c_inline_static_type type)
701 struct c_inline_static *csi = ggc_alloc_c_inline_static ();
703 csi->function = func;
704 csi->static_decl = decl;
706 csi->next = c_inline_statics;
707 c_inline_statics = csi;
710 /* Check for references to static declarations in inline functions at
711 the end of the translation unit and diagnose them if the functions
712 are still inline definitions. */
715 check_inline_statics (void)
717 struct c_inline_static *csi;
718 for (csi = c_inline_statics; csi; csi = csi->next)
720 if (DECL_EXTERNAL (csi->function))
724 pedwarn (csi->location, 0,
725 "%qD is static but used in inline function %qD "
726 "which is not static", csi->static_decl, csi->function);
729 pedwarn (csi->location, 0,
730 "%q+D is static but declared in inline function %qD "
731 "which is not static", csi->static_decl, csi->function);
737 c_inline_statics = NULL;
740 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
741 for the current state, otherwise set it to uninitialized. */
744 set_spot_bindings (struct c_spot_bindings *p, bool defining)
748 p->scope = current_scope;
749 p->bindings_in_scope = current_scope->bindings;
754 p->bindings_in_scope = NULL;
757 p->left_stmt_expr = false;
760 /* Return true if we will want to say something if a goto statement
764 decl_jump_unsafe (tree decl)
766 if (decl == error_mark_node || TREE_TYPE (decl) == error_mark_node)
769 /* Always warn about crossing variably modified types. */
770 if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == TYPE_DECL)
771 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
774 /* Otherwise, only warn if -Wgoto-misses-init and this is an
775 initialized automatic decl. */
776 if (warn_jump_misses_init
777 && TREE_CODE (decl) == VAR_DECL
778 && !TREE_STATIC (decl)
779 && DECL_INITIAL (decl) != NULL_TREE)
785 /* Update spot bindings P as we pop out of SCOPE. Return true if we
786 should push decls for a label. */
789 update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p)
791 if (p->scope != scope)
793 /* This label or goto is defined in some other scope, or it is a
794 label which is not yet defined. There is nothing to
799 /* Adjust the spot bindings to refer to the bindings already defined
800 in the enclosing scope. */
801 p->scope = scope->outer;
802 p->bindings_in_scope = p->scope->bindings;
807 /* The Objective-C front-end often needs to determine the current scope. */
810 objc_get_current_scope (void)
812 return current_scope;
815 /* The following function is used only by Objective-C. It needs to live here
816 because it accesses the innards of c_scope. */
819 objc_mark_locals_volatile (void *enclosing_blk)
821 struct c_scope *scope;
824 for (scope = current_scope;
825 scope && scope != enclosing_blk;
826 scope = scope->outer)
828 for (b = scope->bindings; b; b = b->prev)
829 objc_volatilize_decl (b->decl);
831 /* Do not climb up past the current function. */
832 if (scope->function_body)
837 /* Nonzero if we are currently in file scope. */
840 global_bindings_p (void)
842 return (current_scope == file_scope && !c_override_global_bindings_to_false
848 keep_next_level (void)
850 keep_next_level_flag = true;
853 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
856 set_float_const_decimal64 (void)
858 current_scope->float_const_decimal64 = true;
861 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
864 clear_float_const_decimal64 (void)
866 current_scope->float_const_decimal64 = false;
869 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
872 float_const_decimal64_p (void)
874 return current_scope->float_const_decimal64;
877 /* Identify this scope as currently being filled with parameters. */
880 declare_parm_level (void)
882 current_scope->parm_flag = true;
888 if (next_is_function_body)
890 /* This is the transition from the parameters to the top level
891 of the function body. These are the same scope
892 (C99 6.2.1p4,6) so we do not push another scope structure.
893 next_is_function_body is set only by store_parm_decls, which
894 in turn is called when and only when we are about to
895 encounter the opening curly brace for the function body.
897 The outermost block of a function always gets a BLOCK node,
898 because the debugging output routines expect that each
899 function has at least one BLOCK. */
900 current_scope->parm_flag = false;
901 current_scope->function_body = true;
902 current_scope->keep = true;
903 current_scope->outer_function = current_function_scope;
904 current_function_scope = current_scope;
906 keep_next_level_flag = false;
907 next_is_function_body = false;
909 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
910 if (current_scope->outer)
911 current_scope->float_const_decimal64
912 = current_scope->outer->float_const_decimal64;
914 current_scope->float_const_decimal64 = false;
918 struct c_scope *scope;
921 scope = scope_freelist;
922 scope_freelist = scope->outer;
925 scope = ggc_alloc_cleared_c_scope ();
927 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
929 scope->float_const_decimal64 = current_scope->float_const_decimal64;
931 scope->float_const_decimal64 = false;
933 scope->keep = keep_next_level_flag;
934 scope->outer = current_scope;
935 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
937 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
939 if (current_scope && scope->depth == 0)
942 sorry ("GCC supports only %u nested scopes", scope->depth);
945 current_scope = scope;
946 keep_next_level_flag = false;
950 /* This is called when we are leaving SCOPE. For each label defined
951 in SCOPE, add any appropriate decls to its decls_in_scope fields.
952 These are the decls whose initialization will be skipped by a goto
953 later in the function. */
956 update_label_decls (struct c_scope *scope)
963 if (s->has_label_bindings)
967 for (b = s->bindings; b != NULL; b = b->prev)
969 struct c_label_vars *label_vars;
970 struct c_binding *b1;
972 struct c_goto_bindings *g;
974 if (TREE_CODE (b->decl) != LABEL_DECL)
976 label_vars = b->u.label;
978 b1 = label_vars->label_bindings.bindings_in_scope;
979 if (update_spot_bindings (scope, &label_vars->label_bindings))
981 /* This label is defined in this scope. */
982 for (; b1 != NULL; b1 = b1->prev)
984 /* A goto from later in the function to this
985 label will never see the initialization of
986 B1, if any. Save it to issue a warning if
988 if (decl_jump_unsafe (b1->decl))
989 VEC_safe_push (tree, gc, label_vars->decls_in_scope,
994 /* Update the bindings of any goto statements associated
996 FOR_EACH_VEC_ELT (c_goto_bindings_p, label_vars->gotos, ix, g)
997 update_spot_bindings (scope, &g->goto_bindings);
1001 /* Don't search beyond the current function. */
1002 if (s == current_function_scope)
1009 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1012 set_type_context (tree type, tree context)
1014 for (type = TYPE_MAIN_VARIANT (type); type;
1015 type = TYPE_NEXT_VARIANT (type))
1016 TYPE_CONTEXT (type) = context;
1019 /* Exit a scope. Restore the state of the identifier-decl mappings
1020 that were in effect when this scope was entered. Return a BLOCK
1021 node containing all the DECLs in this scope that are of interest
1022 to debug info generation. */
1027 struct c_scope *scope = current_scope;
1028 tree block, context, p;
1029 struct c_binding *b;
1031 bool functionbody = scope->function_body;
1032 bool keep = functionbody || scope->keep || scope->bindings;
1034 update_label_decls (scope);
1036 /* If appropriate, create a BLOCK to record the decls for the life
1037 of this function. */
1041 block = make_node (BLOCK);
1042 BLOCK_SUBBLOCKS (block) = scope->blocks;
1043 TREE_USED (block) = 1;
1045 /* In each subblock, record that this is its superior. */
1046 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
1047 BLOCK_SUPERCONTEXT (p) = block;
1049 BLOCK_VARS (block) = 0;
1052 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1053 scope must be set so that they point to the appropriate
1054 construct, i.e. either to the current FUNCTION_DECL node, or
1055 else to the BLOCK node we just constructed.
1057 Note that for tagged types whose scope is just the formal
1058 parameter list for some function type specification, we can't
1059 properly set their TYPE_CONTEXTs here, because we don't have a
1060 pointer to the appropriate FUNCTION_TYPE node readily available
1061 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1062 type nodes get set in `grokdeclarator' as soon as we have created
1063 the FUNCTION_TYPE node which will represent the "scope" for these
1064 "parameter list local" tagged types. */
1065 if (scope->function_body)
1066 context = current_function_decl;
1067 else if (scope == file_scope)
1069 tree file_decl = build_translation_unit_decl (NULL_TREE);
1070 context = file_decl;
1075 /* Clear all bindings in this scope. */
1076 for (b = scope->bindings; b; b = free_binding_and_advance (b))
1079 switch (TREE_CODE (p))
1082 /* Warnings for unused labels, errors for undefined labels. */
1083 if (TREE_USED (p) && !DECL_INITIAL (p))
1085 error ("label %q+D used but not defined", p);
1086 DECL_INITIAL (p) = error_mark_node;
1089 warn_for_unused_label (p);
1091 /* Labels go in BLOCK_VARS. */
1092 DECL_CHAIN (p) = BLOCK_VARS (block);
1093 BLOCK_VARS (block) = p;
1094 gcc_assert (I_LABEL_BINDING (b->id) == b);
1095 I_LABEL_BINDING (b->id) = b->shadowed;
1097 /* Also pop back to the shadowed label_vars. */
1098 release_tree_vector (b->u.label->decls_in_scope);
1099 b->u.label = b->u.label->shadowed;
1105 set_type_context (p, context);
1107 /* Types may not have tag-names, in which case the type
1108 appears in the bindings list with b->id NULL. */
1111 gcc_assert (I_TAG_BINDING (b->id) == b);
1112 I_TAG_BINDING (b->id) = b->shadowed;
1117 /* Propagate TREE_ADDRESSABLE from nested functions to their
1118 containing functions. */
1119 if (!TREE_ASM_WRITTEN (p)
1120 && DECL_INITIAL (p) != 0
1121 && TREE_ADDRESSABLE (p)
1122 && DECL_ABSTRACT_ORIGIN (p) != 0
1123 && DECL_ABSTRACT_ORIGIN (p) != p)
1124 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
1125 if (!DECL_EXTERNAL (p)
1126 && !DECL_INITIAL (p)
1127 && scope != file_scope
1128 && scope != external_scope)
1130 error ("nested function %q+D declared but never defined", p);
1131 undef_nested_function = true;
1133 else if (DECL_DECLARED_INLINE_P (p)
1135 && !DECL_INITIAL (p))
1137 /* C99 6.7.4p6: "a function with external linkage... declared
1138 with an inline function specifier ... shall also be defined
1139 in the same translation unit." */
1140 if (!flag_gnu89_inline)
1141 pedwarn (input_location, 0,
1142 "inline function %q+D declared but never defined", p);
1143 DECL_EXTERNAL (p) = 1;
1149 /* Warnings for unused variables. */
1150 if ((!TREE_USED (p) || !DECL_READ_P (p))
1151 && !TREE_NO_WARNING (p)
1152 && !DECL_IN_SYSTEM_HEADER (p)
1154 && !DECL_ARTIFICIAL (p)
1155 && scope != file_scope
1156 && scope != external_scope)
1159 warning (OPT_Wunused_variable, "unused variable %q+D", p);
1160 else if (DECL_CONTEXT (p) == current_function_decl)
1161 warning_at (DECL_SOURCE_LOCATION (p),
1162 OPT_Wunused_but_set_variable,
1163 "variable %qD set but not used", p);
1168 error ("type of array %q+D completed incompatibly with"
1169 " implicit initialization", p);
1176 /* All of these go in BLOCK_VARS, but only if this is the
1177 binding in the home scope. */
1180 DECL_CHAIN (p) = BLOCK_VARS (block);
1181 BLOCK_VARS (block) = p;
1183 else if (VAR_OR_FUNCTION_DECL_P (p))
1185 /* For block local externs add a special
1186 DECL_EXTERNAL decl for debug info generation. */
1187 tree extp = copy_node (p);
1189 DECL_EXTERNAL (extp) = 1;
1190 TREE_STATIC (extp) = 0;
1191 TREE_PUBLIC (extp) = 1;
1192 DECL_INITIAL (extp) = NULL_TREE;
1193 DECL_LANG_SPECIFIC (extp) = NULL;
1194 DECL_CONTEXT (extp) = current_function_decl;
1195 if (TREE_CODE (p) == FUNCTION_DECL)
1197 DECL_RESULT (extp) = NULL_TREE;
1198 DECL_SAVED_TREE (extp) = NULL_TREE;
1199 DECL_STRUCT_FUNCTION (extp) = NULL;
1201 if (b->locus != UNKNOWN_LOCATION)
1202 DECL_SOURCE_LOCATION (extp) = b->locus;
1203 DECL_CHAIN (extp) = BLOCK_VARS (block);
1204 BLOCK_VARS (block) = extp;
1206 /* If this is the file scope set DECL_CONTEXT of each decl to
1207 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1209 if (scope == file_scope)
1211 DECL_CONTEXT (p) = context;
1212 if (TREE_CODE (p) == TYPE_DECL
1213 && TREE_TYPE (p) != error_mark_node)
1214 set_type_context (TREE_TYPE (p), context);
1218 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1219 already been put there by store_parm_decls. Unused-
1220 parameter warnings are handled by function.c.
1221 error_mark_node obviously does not go in BLOCK_VARS and
1222 does not get unused-variable warnings. */
1225 /* It is possible for a decl not to have a name. We get
1226 here with b->id NULL in this case. */
1229 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
1230 I_SYMBOL_BINDING (b->id) = b->shadowed;
1231 if (b->shadowed && b->shadowed->u.type)
1232 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
1242 /* Dispose of the block that we just made inside some higher level. */
1243 if ((scope->function_body || scope == file_scope) && context)
1245 DECL_INITIAL (context) = block;
1246 BLOCK_SUPERCONTEXT (block) = context;
1248 else if (scope->outer)
1251 SCOPE_LIST_APPEND (scope->outer, blocks, block);
1252 /* If we did not make a block for the scope just exited, any
1253 blocks made for inner scopes must be carried forward so they
1254 will later become subblocks of something else. */
1255 else if (scope->blocks)
1256 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
1259 /* Pop the current scope, and free the structure for reuse. */
1260 current_scope = scope->outer;
1261 if (scope->function_body)
1262 current_function_scope = scope->outer_function;
1264 memset (scope, 0, sizeof (struct c_scope));
1265 scope->outer = scope_freelist;
1266 scope_freelist = scope;
1272 push_file_scope (void)
1280 file_scope = current_scope;
1282 start_fname_decls ();
1284 for (decl = visible_builtins; decl; decl = DECL_CHAIN (decl))
1285 bind (DECL_NAME (decl), decl, file_scope,
1286 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl));
1290 pop_file_scope (void)
1292 /* In case there were missing closebraces, get us back to the global
1294 while (current_scope != file_scope)
1297 /* __FUNCTION__ is defined at file scope (""). This
1298 call may not be necessary as my tests indicate it
1299 still works without it. */
1300 finish_fname_decls ();
1302 check_inline_statics ();
1304 /* This is the point to write out a PCH if we're doing that.
1305 In that case we do not want to do anything else. */
1308 c_common_write_pch ();
1312 /* Pop off the file scope and close this translation unit. */
1316 maybe_apply_pending_pragma_weaks ();
1319 /* Adjust the bindings for the start of a statement expression. */
1322 c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings)
1324 struct c_scope *scope;
1326 for (scope = current_scope; scope != NULL; scope = scope->outer)
1328 struct c_binding *b;
1330 if (!scope->has_label_bindings)
1333 for (b = scope->bindings; b != NULL; b = b->prev)
1335 struct c_label_vars *label_vars;
1337 struct c_goto_bindings *g;
1339 if (TREE_CODE (b->decl) != LABEL_DECL)
1341 label_vars = b->u.label;
1342 ++label_vars->label_bindings.stmt_exprs;
1343 FOR_EACH_VEC_ELT (c_goto_bindings_p, label_vars->gotos, ix, g)
1344 ++g->goto_bindings.stmt_exprs;
1348 if (switch_bindings != NULL)
1349 ++switch_bindings->stmt_exprs;
1352 /* Adjust the bindings for the end of a statement expression. */
1355 c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings)
1357 struct c_scope *scope;
1359 for (scope = current_scope; scope != NULL; scope = scope->outer)
1361 struct c_binding *b;
1363 if (!scope->has_label_bindings)
1366 for (b = scope->bindings; b != NULL; b = b->prev)
1368 struct c_label_vars *label_vars;
1370 struct c_goto_bindings *g;
1372 if (TREE_CODE (b->decl) != LABEL_DECL)
1374 label_vars = b->u.label;
1375 --label_vars->label_bindings.stmt_exprs;
1376 if (label_vars->label_bindings.stmt_exprs < 0)
1378 label_vars->label_bindings.left_stmt_expr = true;
1379 label_vars->label_bindings.stmt_exprs = 0;
1381 FOR_EACH_VEC_ELT (c_goto_bindings_p, label_vars->gotos, ix, g)
1383 --g->goto_bindings.stmt_exprs;
1384 if (g->goto_bindings.stmt_exprs < 0)
1386 g->goto_bindings.left_stmt_expr = true;
1387 g->goto_bindings.stmt_exprs = 0;
1393 if (switch_bindings != NULL)
1395 --switch_bindings->stmt_exprs;
1396 gcc_assert (switch_bindings->stmt_exprs >= 0);
1400 /* Push a definition or a declaration of struct, union or enum tag "name".
1401 "type" should be the type node.
1402 We assume that the tag "name" is not already defined, and has a location
1405 Note that the definition may really be just a forward reference.
1406 In that case, the TYPE_SIZE will be zero. */
1409 pushtag (location_t loc, tree name, tree type)
1411 /* Record the identifier as the type's name if it has none. */
1412 if (name && !TYPE_NAME (type))
1413 TYPE_NAME (type) = name;
1414 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc);
1416 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1417 tagged type we just added to the current scope. This fake
1418 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1419 to output a representation of a tagged type, and it also gives
1420 us a convenient place to record the "scope start" address for the
1423 TYPE_STUB_DECL (type) = pushdecl (build_decl (loc,
1424 TYPE_DECL, NULL_TREE, type));
1426 /* An approximation for now, so we can tell this is a function-scope tag.
1427 This will be updated in pop_scope. */
1428 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1430 if (warn_cxx_compat && name != NULL_TREE)
1432 struct c_binding *b = I_SYMBOL_BINDING (name);
1435 && b->decl != NULL_TREE
1436 && TREE_CODE (b->decl) == TYPE_DECL
1437 && (B_IN_CURRENT_SCOPE (b)
1438 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
1439 && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl))
1440 != TYPE_MAIN_VARIANT (type)))
1442 warning_at (loc, OPT_Wc___compat,
1443 ("using %qD as both a typedef and a tag is "
1446 if (b->locus != UNKNOWN_LOCATION)
1447 inform (b->locus, "originally defined here");
1452 /* Subroutine of compare_decls. Allow harmless mismatches in return
1453 and argument types provided that the type modes match. This function
1454 return a unified type given a suitable match, and 0 otherwise. */
1457 match_builtin_function_types (tree newtype, tree oldtype)
1459 tree newrettype, oldrettype;
1460 tree newargs, oldargs;
1461 tree trytype, tryargs;
1463 /* Accept the return type of the new declaration if same modes. */
1464 oldrettype = TREE_TYPE (oldtype);
1465 newrettype = TREE_TYPE (newtype);
1467 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1470 oldargs = TYPE_ARG_TYPES (oldtype);
1471 newargs = TYPE_ARG_TYPES (newtype);
1474 while (oldargs || newargs)
1478 || !TREE_VALUE (oldargs)
1479 || !TREE_VALUE (newargs)
1480 || TYPE_MODE (TREE_VALUE (oldargs))
1481 != TYPE_MODE (TREE_VALUE (newargs)))
1484 oldargs = TREE_CHAIN (oldargs);
1485 newargs = TREE_CHAIN (newargs);
1488 trytype = build_function_type (newrettype, tryargs);
1489 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1492 /* Subroutine of diagnose_mismatched_decls. Check for function type
1493 mismatch involving an empty arglist vs a nonempty one and give clearer
1496 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1497 tree newtype, tree oldtype)
1501 if (TREE_CODE (olddecl) != FUNCTION_DECL
1502 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1503 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1505 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1508 t = TYPE_ARG_TYPES (oldtype);
1510 t = TYPE_ARG_TYPES (newtype);
1511 for (; t; t = TREE_CHAIN (t))
1513 tree type = TREE_VALUE (t);
1515 if (TREE_CHAIN (t) == 0
1516 && TYPE_MAIN_VARIANT (type) != void_type_node)
1518 inform (input_location, "a parameter list with an ellipsis can%'t match "
1519 "an empty parameter name list declaration");
1523 if (c_type_promotes_to (type) != type)
1525 inform (input_location, "an argument type that has a default promotion can%'t match "
1526 "an empty parameter name list declaration");
1532 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1533 old-style function definition, NEWDECL is a prototype declaration.
1534 Diagnose inconsistencies in the argument list. Returns TRUE if
1535 the prototype is compatible, FALSE if not. */
1537 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1539 tree newargs, oldargs;
1542 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1544 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1545 newargs = TYPE_ARG_TYPES (newtype);
1550 tree oldargtype = TREE_VALUE (oldargs);
1551 tree newargtype = TREE_VALUE (newargs);
1553 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1556 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1557 newargtype = TYPE_MAIN_VARIANT (newargtype);
1559 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1562 /* Reaching the end of just one list means the two decls don't
1563 agree on the number of arguments. */
1564 if (END_OF_ARGLIST (oldargtype))
1566 error ("prototype for %q+D declares more arguments "
1567 "than previous old-style definition", newdecl);
1570 else if (END_OF_ARGLIST (newargtype))
1572 error ("prototype for %q+D declares fewer arguments "
1573 "than previous old-style definition", newdecl);
1577 /* Type for passing arg must be consistent with that declared
1579 else if (!comptypes (oldargtype, newargtype))
1581 error ("prototype for %q+D declares argument %d"
1582 " with incompatible type",
1587 oldargs = TREE_CHAIN (oldargs);
1588 newargs = TREE_CHAIN (newargs);
1592 /* If we get here, no errors were found, but do issue a warning
1593 for this poor-style construct. */
1594 warning (0, "prototype for %q+D follows non-prototype definition",
1597 #undef END_OF_ARGLIST
1600 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1601 first in a pair of mismatched declarations, using the diagnostic
1604 locate_old_decl (tree decl)
1606 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1608 else if (DECL_INITIAL (decl))
1609 inform (input_location, "previous definition of %q+D was here", decl);
1610 else if (C_DECL_IMPLICIT (decl))
1611 inform (input_location, "previous implicit declaration of %q+D was here", decl);
1613 inform (input_location, "previous declaration of %q+D was here", decl);
1616 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1617 Returns true if the caller should proceed to merge the two, false
1618 if OLDDECL should simply be discarded. As a side effect, issues
1619 all necessary diagnostics for invalid or poor-style combinations.
1620 If it returns true, writes the types of NEWDECL and OLDDECL to
1621 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1622 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1625 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1626 tree *newtypep, tree *oldtypep)
1628 tree newtype, oldtype;
1629 bool pedwarned = false;
1630 bool warned = false;
1633 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1634 && DECL_EXTERNAL (DECL))
1636 /* If we have error_mark_node for either decl or type, just discard
1637 the previous decl - we're in an error cascade already. */
1638 if (olddecl == error_mark_node || newdecl == error_mark_node)
1640 *oldtypep = oldtype = TREE_TYPE (olddecl);
1641 *newtypep = newtype = TREE_TYPE (newdecl);
1642 if (oldtype == error_mark_node || newtype == error_mark_node)
1645 /* Two different categories of symbol altogether. This is an error
1646 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1647 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1649 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1650 && DECL_BUILT_IN (olddecl)
1651 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1653 error ("%q+D redeclared as different kind of symbol", newdecl);
1654 locate_old_decl (olddecl);
1656 else if (TREE_PUBLIC (newdecl))
1657 warning (0, "built-in function %q+D declared as non-function",
1660 warning (OPT_Wshadow, "declaration of %q+D shadows "
1661 "a built-in function", newdecl);
1665 /* Enumerators have no linkage, so may only be declared once in a
1667 if (TREE_CODE (olddecl) == CONST_DECL)
1669 error ("redeclaration of enumerator %q+D", newdecl);
1670 locate_old_decl (olddecl);
1674 if (!comptypes (oldtype, newtype))
1676 if (TREE_CODE (olddecl) == FUNCTION_DECL
1677 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1679 /* Accept harmless mismatch in function types.
1680 This is for the ffs and fprintf builtins. */
1681 tree trytype = match_builtin_function_types (newtype, oldtype);
1683 if (trytype && comptypes (newtype, trytype))
1684 *oldtypep = oldtype = trytype;
1687 /* If types don't match for a built-in, throw away the
1688 built-in. No point in calling locate_old_decl here, it
1689 won't print anything. */
1690 warning (0, "conflicting types for built-in function %q+D",
1695 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1696 && DECL_IS_BUILTIN (olddecl))
1698 /* A conflicting function declaration for a predeclared
1699 function that isn't actually built in. Objective C uses
1700 these. The new declaration silently overrides everything
1701 but the volatility (i.e. noreturn) indication. See also
1702 below. FIXME: Make Objective C use normal builtins. */
1703 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1706 /* Permit void foo (...) to match int foo (...) if the latter is
1707 the definition and implicit int was used. See
1708 c-torture/compile/920625-2.c. */
1709 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1710 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1711 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1712 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1714 pedwarned = pedwarn (input_location, 0,
1715 "conflicting types for %q+D", newdecl);
1716 /* Make sure we keep void as the return type. */
1717 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1718 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1720 /* Permit void foo (...) to match an earlier call to foo (...) with
1721 no declared type (thus, implicitly int). */
1722 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1723 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1724 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1725 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1727 pedwarned = pedwarn (input_location, 0,
1728 "conflicting types for %q+D", newdecl);
1729 /* Make sure we keep void as the return type. */
1730 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1734 int new_quals = TYPE_QUALS (newtype);
1735 int old_quals = TYPE_QUALS (oldtype);
1737 if (new_quals != old_quals)
1739 addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals);
1740 addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals);
1741 if (new_addr != old_addr)
1743 if (ADDR_SPACE_GENERIC_P (new_addr))
1744 error ("conflicting named address spaces (generic vs %s) "
1746 c_addr_space_name (old_addr), newdecl);
1747 else if (ADDR_SPACE_GENERIC_P (old_addr))
1748 error ("conflicting named address spaces (%s vs generic) "
1750 c_addr_space_name (new_addr), newdecl);
1752 error ("conflicting named address spaces (%s vs %s) "
1754 c_addr_space_name (new_addr),
1755 c_addr_space_name (old_addr),
1759 if (CLEAR_QUAL_ADDR_SPACE (new_quals)
1760 != CLEAR_QUAL_ADDR_SPACE (old_quals))
1761 error ("conflicting type qualifiers for %q+D", newdecl);
1764 error ("conflicting types for %q+D", newdecl);
1765 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1766 locate_old_decl (olddecl);
1771 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1772 but silently ignore the redeclaration if either is in a system
1773 header. (Conflicting redeclarations were handled above.) This
1774 is allowed for C1X if the types are the same, not just
1776 if (TREE_CODE (newdecl) == TYPE_DECL)
1778 bool types_different = false;
1779 int comptypes_result;
1782 = comptypes_check_different_types (oldtype, newtype, &types_different);
1784 if (comptypes_result != 1 || types_different)
1786 error ("redefinition of typedef %q+D with different type", newdecl);
1787 locate_old_decl (olddecl);
1791 if (DECL_IN_SYSTEM_HEADER (newdecl)
1792 || DECL_IN_SYSTEM_HEADER (olddecl)
1793 || TREE_NO_WARNING (newdecl)
1794 || TREE_NO_WARNING (olddecl))
1795 return true; /* Allow OLDDECL to continue in use. */
1797 if (pedantic && !flag_isoc1x)
1799 pedwarn (input_location, OPT_pedantic,
1800 "redefinition of typedef %q+D", newdecl);
1801 locate_old_decl (olddecl);
1803 else if (variably_modified_type_p (newtype, NULL))
1805 /* Whether there is a constraint violation for the types not
1806 being the same cannot be determined at compile time; a
1807 warning that there may be one at runtime is considered
1808 appropriate (WG14 reflector message 11743, 8 May 2009). */
1809 warning (0, "redefinition of typedef %q+D may be a constraint "
1810 "violation at runtime", newdecl);
1811 locate_old_decl (olddecl);
1817 /* Function declarations can either be 'static' or 'extern' (no
1818 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1819 can never conflict with each other on account of linkage
1820 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1821 gnu89 mode permits two definitions if one is 'extern inline' and
1822 one is not. The non- extern-inline definition supersedes the
1823 extern-inline definition. */
1825 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1827 /* If you declare a built-in function name as static, or
1828 define the built-in with an old-style definition (so we
1829 can't validate the argument list) the built-in definition is
1830 overridden, but optionally warn this was a bad choice of name. */
1831 if (DECL_BUILT_IN (olddecl)
1832 && !C_DECL_DECLARED_BUILTIN (olddecl)
1833 && (!TREE_PUBLIC (newdecl)
1834 || (DECL_INITIAL (newdecl)
1835 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1837 warning (OPT_Wshadow, "declaration of %q+D shadows "
1838 "a built-in function", newdecl);
1839 /* Discard the old built-in function. */
1843 if (DECL_INITIAL (newdecl))
1845 if (DECL_INITIAL (olddecl))
1847 /* If both decls are in the same TU and the new declaration
1848 isn't overriding an extern inline reject the new decl.
1849 In c99, no overriding is allowed in the same translation
1851 if ((!DECL_EXTERN_INLINE (olddecl)
1852 || DECL_EXTERN_INLINE (newdecl)
1853 || (!flag_gnu89_inline
1854 && (!DECL_DECLARED_INLINE_P (olddecl)
1855 || !lookup_attribute ("gnu_inline",
1856 DECL_ATTRIBUTES (olddecl)))
1857 && (!DECL_DECLARED_INLINE_P (newdecl)
1858 || !lookup_attribute ("gnu_inline",
1859 DECL_ATTRIBUTES (newdecl))))
1861 && same_translation_unit_p (newdecl, olddecl))
1863 error ("redefinition of %q+D", newdecl);
1864 locate_old_decl (olddecl);
1869 /* If we have a prototype after an old-style function definition,
1870 the argument types must be checked specially. */
1871 else if (DECL_INITIAL (olddecl)
1872 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1873 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1874 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1876 locate_old_decl (olddecl);
1879 /* A non-static declaration (even an "extern") followed by a
1880 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1881 The same is true for a static forward declaration at block
1882 scope followed by a non-static declaration/definition at file
1883 scope. Static followed by non-static at the same scope is
1884 not undefined behavior, and is the most convenient way to get
1885 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1886 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1887 we do diagnose it if -Wtraditional. */
1888 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1890 /* Two exceptions to the rule. If olddecl is an extern
1891 inline, or a predeclared function that isn't actually
1892 built in, newdecl silently overrides olddecl. The latter
1893 occur only in Objective C; see also above. (FIXME: Make
1894 Objective C use normal builtins.) */
1895 if (!DECL_IS_BUILTIN (olddecl)
1896 && !DECL_EXTERN_INLINE (olddecl))
1898 error ("static declaration of %q+D follows "
1899 "non-static declaration", newdecl);
1900 locate_old_decl (olddecl);
1904 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1906 if (DECL_CONTEXT (olddecl))
1908 error ("non-static declaration of %q+D follows "
1909 "static declaration", newdecl);
1910 locate_old_decl (olddecl);
1913 else if (warn_traditional)
1915 warned |= warning (OPT_Wtraditional,
1916 "non-static declaration of %q+D "
1917 "follows static declaration", newdecl);
1921 /* Make sure gnu_inline attribute is either not present, or
1922 present on all inline decls. */
1923 if (DECL_DECLARED_INLINE_P (olddecl)
1924 && DECL_DECLARED_INLINE_P (newdecl))
1926 bool newa = lookup_attribute ("gnu_inline",
1927 DECL_ATTRIBUTES (newdecl)) != NULL;
1928 bool olda = lookup_attribute ("gnu_inline",
1929 DECL_ATTRIBUTES (olddecl)) != NULL;
1932 error_at (input_location, "%<gnu_inline%> attribute present on %q+D",
1933 newa ? newdecl : olddecl);
1934 error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl),
1939 else if (TREE_CODE (newdecl) == VAR_DECL)
1941 /* Only variables can be thread-local, and all declarations must
1942 agree on this property. */
1943 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1945 /* Nothing to check. Since OLDDECL is marked threadprivate
1946 and NEWDECL does not have a thread-local attribute, we
1947 will merge the threadprivate attribute into NEWDECL. */
1950 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1952 if (DECL_THREAD_LOCAL_P (newdecl))
1953 error ("thread-local declaration of %q+D follows "
1954 "non-thread-local declaration", newdecl);
1956 error ("non-thread-local declaration of %q+D follows "
1957 "thread-local declaration", newdecl);
1959 locate_old_decl (olddecl);
1963 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1964 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1966 error ("redefinition of %q+D", newdecl);
1967 locate_old_decl (olddecl);
1971 /* Objects declared at file scope: if the first declaration had
1972 external linkage (even if it was an external reference) the
1973 second must have external linkage as well, or the behavior is
1974 undefined. If the first declaration had internal linkage, then
1975 the second must too, or else be an external reference (in which
1976 case the composite declaration still has internal linkage).
1977 As for function declarations, we warn about the static-then-
1978 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1979 if (DECL_FILE_SCOPE_P (newdecl)
1980 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1982 if (DECL_EXTERNAL (newdecl))
1984 if (!DECL_FILE_SCOPE_P (olddecl))
1986 error ("extern declaration of %q+D follows "
1987 "declaration with no linkage", newdecl);
1988 locate_old_decl (olddecl);
1991 else if (warn_traditional)
1993 warned |= warning (OPT_Wtraditional,
1994 "non-static declaration of %q+D "
1995 "follows static declaration", newdecl);
2000 if (TREE_PUBLIC (newdecl))
2001 error ("non-static declaration of %q+D follows "
2002 "static declaration", newdecl);
2004 error ("static declaration of %q+D follows "
2005 "non-static declaration", newdecl);
2007 locate_old_decl (olddecl);
2011 /* Two objects with the same name declared at the same block
2012 scope must both be external references (6.7p3). */
2013 else if (!DECL_FILE_SCOPE_P (newdecl))
2015 if (DECL_EXTERNAL (newdecl))
2017 /* Extern with initializer at block scope, which will
2018 already have received an error. */
2020 else if (DECL_EXTERNAL (olddecl))
2022 error ("declaration of %q+D with no linkage follows "
2023 "extern declaration", newdecl);
2024 locate_old_decl (olddecl);
2028 error ("redeclaration of %q+D with no linkage", newdecl);
2029 locate_old_decl (olddecl);
2035 /* C++ does not permit a decl to appear multiple times at file
2038 && DECL_FILE_SCOPE_P (newdecl)
2039 && !DECL_EXTERNAL (newdecl)
2040 && !DECL_EXTERNAL (olddecl))
2041 warned |= warning_at (DECL_SOURCE_LOCATION (newdecl),
2043 ("duplicate declaration of %qD is "
2049 /* All decls must agree on a visibility. */
2050 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
2051 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
2052 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2054 warned |= warning (0, "redeclaration of %q+D with different visibility "
2055 "(old visibility preserved)", newdecl);
2058 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2060 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2061 if (DECL_DECLARED_INLINE_P (newdecl)
2062 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2064 warned |= warning (OPT_Wattributes,
2065 "inline declaration of %qD follows "
2066 "declaration with attribute noinline", newdecl);
2068 else if (DECL_DECLARED_INLINE_P (olddecl)
2069 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
2071 warned |= warning (OPT_Wattributes,
2072 "declaration of %q+D with attribute "
2073 "noinline follows inline declaration ", newdecl);
2076 else /* PARM_DECL, VAR_DECL */
2078 /* Redeclaration of a parameter is a constraint violation (this is
2079 not explicitly stated, but follows from C99 6.7p3 [no more than
2080 one declaration of the same identifier with no linkage in the
2081 same scope, except type tags] and 6.2.2p6 [parameters have no
2082 linkage]). We must check for a forward parameter declaration,
2083 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2084 an extension, the mandatory diagnostic for which is handled by
2085 mark_forward_parm_decls. */
2087 if (TREE_CODE (newdecl) == PARM_DECL
2088 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
2090 error ("redefinition of parameter %q+D", newdecl);
2091 locate_old_decl (olddecl);
2096 /* Optional warning for completely redundant decls. */
2097 if (!warned && !pedwarned
2098 && warn_redundant_decls
2099 /* Don't warn about a function declaration followed by a
2101 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2102 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
2103 /* Don't warn about redundant redeclarations of builtins. */
2104 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2105 && !DECL_BUILT_IN (newdecl)
2106 && DECL_BUILT_IN (olddecl)
2107 && !C_DECL_DECLARED_BUILTIN (olddecl))
2108 /* Don't warn about an extern followed by a definition. */
2109 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
2110 /* Don't warn about forward parameter decls. */
2111 && !(TREE_CODE (newdecl) == PARM_DECL
2112 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2113 /* Don't warn about a variable definition following a declaration. */
2114 && !(TREE_CODE (newdecl) == VAR_DECL
2115 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
2117 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
2121 /* Report location of previous decl/defn. */
2122 if (warned || pedwarned)
2123 locate_old_decl (olddecl);
2125 #undef DECL_EXTERN_INLINE
2130 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2131 consistent with OLDDECL, but carries new information. Merge the
2132 new information into OLDDECL. This function issues no
2136 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
2138 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
2139 && DECL_INITIAL (newdecl) != 0);
2140 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
2141 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
2142 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
2143 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
2144 bool extern_changed = false;
2146 /* For real parm decl following a forward decl, rechain the old decl
2147 in its new location and clear TREE_ASM_WRITTEN (it's not a
2148 forward decl anymore). */
2149 if (TREE_CODE (newdecl) == PARM_DECL
2150 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2152 struct c_binding *b, **here;
2154 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
2155 if ((*here)->decl == olddecl)
2162 b->prev = current_scope->bindings;
2163 current_scope->bindings = b;
2165 TREE_ASM_WRITTEN (olddecl) = 0;
2168 DECL_ATTRIBUTES (newdecl)
2169 = targetm.merge_decl_attributes (olddecl, newdecl);
2171 /* Merge the data types specified in the two decls. */
2173 = TREE_TYPE (olddecl)
2174 = composite_type (newtype, oldtype);
2176 /* Lay the type out, unless already done. */
2177 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
2179 if (TREE_TYPE (newdecl) != error_mark_node)
2180 layout_type (TREE_TYPE (newdecl));
2181 if (TREE_CODE (newdecl) != FUNCTION_DECL
2182 && TREE_CODE (newdecl) != TYPE_DECL
2183 && TREE_CODE (newdecl) != CONST_DECL)
2184 layout_decl (newdecl, 0);
2188 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2189 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
2190 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
2191 DECL_MODE (newdecl) = DECL_MODE (olddecl);
2192 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2194 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2195 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2199 /* Keep the old rtl since we can safely use it. */
2200 if (HAS_RTL_P (olddecl))
2201 COPY_DECL_RTL (olddecl, newdecl);
2203 /* Merge the type qualifiers. */
2204 if (TREE_READONLY (newdecl))
2205 TREE_READONLY (olddecl) = 1;
2207 if (TREE_THIS_VOLATILE (newdecl))
2208 TREE_THIS_VOLATILE (olddecl) = 1;
2210 /* Merge deprecatedness. */
2211 if (TREE_DEPRECATED (newdecl))
2212 TREE_DEPRECATED (olddecl) = 1;
2214 /* If a decl is in a system header and the other isn't, keep the one on the
2215 system header. Otherwise, keep source location of definition rather than
2216 declaration and of prototype rather than non-prototype unless that
2217 prototype is built-in. */
2218 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2219 && DECL_IN_SYSTEM_HEADER (olddecl)
2220 && !DECL_IN_SYSTEM_HEADER (newdecl) )
2221 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2222 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2223 && DECL_IN_SYSTEM_HEADER (newdecl)
2224 && !DECL_IN_SYSTEM_HEADER (olddecl))
2225 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
2226 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
2227 || (old_is_prototype && !new_is_prototype
2228 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
2229 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2231 /* Merge the initialization information. */
2232 if (DECL_INITIAL (newdecl) == 0)
2233 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2235 /* Merge the threadprivate attribute. */
2236 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
2238 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
2239 C_DECL_THREADPRIVATE_P (newdecl) = 1;
2242 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
2244 /* Merge the section attribute.
2245 We want to issue an error if the sections conflict but that
2246 must be done later in decl_attributes since we are called
2247 before attributes are assigned. */
2248 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
2249 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
2251 /* Copy the assembler name.
2252 Currently, it can only be defined in the prototype. */
2253 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2255 /* Use visibility of whichever declaration had it specified */
2256 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2258 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2259 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2262 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2264 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2265 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2266 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2267 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2268 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2269 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2270 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2271 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2272 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2273 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2274 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
2277 /* Merge the storage class information. */
2278 merge_weak (newdecl, olddecl);
2280 /* For functions, static overrides non-static. */
2281 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2283 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2284 /* This is since we don't automatically
2285 copy the attributes of NEWDECL into OLDDECL. */
2286 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2287 /* If this clears `static', clear it in the identifier too. */
2288 if (!TREE_PUBLIC (olddecl))
2289 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2293 /* In c99, 'extern' declaration before (or after) 'inline' means this
2294 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2296 if (TREE_CODE (newdecl) == FUNCTION_DECL
2297 && !flag_gnu89_inline
2298 && (DECL_DECLARED_INLINE_P (newdecl)
2299 || DECL_DECLARED_INLINE_P (olddecl))
2300 && (!DECL_DECLARED_INLINE_P (newdecl)
2301 || !DECL_DECLARED_INLINE_P (olddecl)
2302 || !DECL_EXTERNAL (olddecl))
2303 && DECL_EXTERNAL (newdecl)
2304 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
2305 && !current_function_decl)
2306 DECL_EXTERNAL (newdecl) = 0;
2308 if (DECL_EXTERNAL (newdecl))
2310 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2311 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2313 /* An extern decl does not override previous storage class. */
2314 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2315 if (!DECL_EXTERNAL (newdecl))
2317 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2318 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2323 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2324 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2327 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2329 /* If we're redefining a function previously defined as extern
2330 inline, make sure we emit debug info for the inline before we
2331 throw it away, in case it was inlined into a function that
2332 hasn't been written out yet. */
2333 if (new_is_definition && DECL_INITIAL (olddecl))
2334 /* The new defn must not be inline. */
2335 DECL_UNINLINABLE (newdecl) = 1;
2338 /* If either decl says `inline', this fn is inline, unless
2339 its definition was passed already. */
2340 if (DECL_DECLARED_INLINE_P (newdecl)
2341 || DECL_DECLARED_INLINE_P (olddecl))
2342 DECL_DECLARED_INLINE_P (newdecl) = 1;
2344 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2345 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2347 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2348 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2349 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2350 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2353 if (DECL_BUILT_IN (olddecl))
2355 /* If redeclaring a builtin function, it stays built in.
2356 But it gets tagged as having been declared. */
2357 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2358 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2359 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
2360 if (new_is_prototype)
2361 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
2363 C_DECL_BUILTIN_PROTOTYPE (newdecl)
2364 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
2367 /* Preserve function specific target and optimization options */
2368 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2369 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2370 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2371 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2373 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2374 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2375 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2376 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2378 /* Also preserve various other info from the definition. */
2379 if (!new_is_definition)
2382 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2383 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2384 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2385 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2386 DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl));
2387 for (t = DECL_ARGUMENTS (newdecl); t ; t = DECL_CHAIN (t))
2388 DECL_CONTEXT (t) = newdecl;
2390 /* See if we've got a function to instantiate from. */
2391 if (DECL_SAVED_TREE (olddecl))
2392 DECL_ABSTRACT_ORIGIN (newdecl)
2393 = DECL_ABSTRACT_ORIGIN (olddecl);
2397 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
2399 /* Merge the USED information. */
2400 if (TREE_USED (olddecl))
2401 TREE_USED (newdecl) = 1;
2402 else if (TREE_USED (newdecl))
2403 TREE_USED (olddecl) = 1;
2404 if (TREE_CODE (olddecl) == VAR_DECL || TREE_CODE (olddecl) == PARM_DECL)
2405 DECL_READ_P (newdecl) |= DECL_READ_P (olddecl);
2406 if (DECL_PRESERVE_P (olddecl))
2407 DECL_PRESERVE_P (newdecl) = 1;
2408 else if (DECL_PRESERVE_P (newdecl))
2409 DECL_PRESERVE_P (olddecl) = 1;
2411 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2412 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2413 DECL_ARGUMENTS (if appropriate). */
2415 unsigned olddecl_uid = DECL_UID (olddecl);
2416 tree olddecl_context = DECL_CONTEXT (olddecl);
2417 tree olddecl_arguments = NULL;
2418 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2419 olddecl_arguments = DECL_ARGUMENTS (olddecl);
2421 memcpy ((char *) olddecl + sizeof (struct tree_common),
2422 (char *) newdecl + sizeof (struct tree_common),
2423 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2424 switch (TREE_CODE (olddecl))
2434 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2435 (char *) newdecl + sizeof (struct tree_decl_common),
2436 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2441 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2442 (char *) newdecl + sizeof (struct tree_decl_common),
2443 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
2445 DECL_UID (olddecl) = olddecl_uid;
2446 DECL_CONTEXT (olddecl) = olddecl_context;
2447 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2448 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
2451 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2452 so that encode_section_info has a chance to look at the new decl
2453 flags and attributes. */
2454 if (DECL_RTL_SET_P (olddecl)
2455 && (TREE_CODE (olddecl) == FUNCTION_DECL
2456 || (TREE_CODE (olddecl) == VAR_DECL
2457 && TREE_STATIC (olddecl))))
2458 make_decl_rtl (olddecl);
2460 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
2461 and the definition is coming from the old version, cgraph needs
2462 to be called again. */
2463 if (extern_changed && !new_is_definition
2464 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
2465 cgraph_mark_if_needed (olddecl);
2468 /* Handle when a new declaration NEWDECL has the same name as an old
2469 one OLDDECL in the same binding contour. Prints an error message
2472 If safely possible, alter OLDDECL to look like NEWDECL, and return
2473 true. Otherwise, return false. */
2476 duplicate_decls (tree newdecl, tree olddecl)
2478 tree newtype = NULL, oldtype = NULL;
2480 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
2482 /* Avoid `unused variable' and other warnings for OLDDECL. */
2483 TREE_NO_WARNING (olddecl) = 1;
2487 merge_decls (newdecl, olddecl, newtype, oldtype);
2492 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2494 warn_if_shadowing (tree new_decl)
2496 struct c_binding *b;
2498 /* Shadow warnings wanted? */
2500 /* No shadow warnings for internally generated vars. */
2501 || DECL_IS_BUILTIN (new_decl)
2502 /* No shadow warnings for vars made for inlining. */
2503 || DECL_FROM_INLINE (new_decl))
2506 /* Is anything being shadowed? Invisible decls do not count. */
2507 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
2508 if (b->decl && b->decl != new_decl && !b->invisible)
2510 tree old_decl = b->decl;
2512 if (old_decl == error_mark_node)
2514 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
2515 "non-variable", new_decl);
2518 else if (TREE_CODE (old_decl) == PARM_DECL)
2519 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
2521 else if (DECL_FILE_SCOPE_P (old_decl))
2522 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
2523 "declaration", new_decl);
2524 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2525 && DECL_BUILT_IN (old_decl))
2527 warning (OPT_Wshadow, "declaration of %q+D shadows "
2528 "a built-in function", new_decl);
2532 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
2535 warning_at (DECL_SOURCE_LOCATION (old_decl), OPT_Wshadow,
2536 "shadowed declaration is here");
2542 /* Record a decl-node X as belonging to the current lexical scope.
2543 Check for errors (such as an incompatible declaration for the same
2544 name already seen in the same scope).
2546 Returns either X or an old decl for the same name.
2547 If an old decl is returned, it may have been smashed
2548 to agree with what X says. */
2553 tree name = DECL_NAME (x);
2554 struct c_scope *scope = current_scope;
2555 struct c_binding *b;
2556 bool nested = false;
2557 location_t locus = DECL_SOURCE_LOCATION (x);
2559 /* Must set DECL_CONTEXT for everything not at file scope or
2560 DECL_FILE_SCOPE_P won't work. Local externs don't count
2561 unless they have initializers (which generate code). */
2562 if (current_function_decl
2563 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2564 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2565 DECL_CONTEXT (x) = current_function_decl;
2567 /* Anonymous decls are just inserted in the scope. */
2570 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
2575 /* First, see if there is another declaration with the same name in
2576 the current scope. If there is, duplicate_decls may do all the
2577 work for us. If duplicate_decls returns false, that indicates
2578 two incompatible decls in the same scope; we are to silently
2579 replace the old one (duplicate_decls has issued all appropriate
2580 diagnostics). In particular, we should not consider possible
2581 duplicates in the external scope, or shadowing. */
2582 b = I_SYMBOL_BINDING (name);
2583 if (b && B_IN_SCOPE (b, scope))
2585 struct c_binding *b_ext, *b_use;
2586 tree type = TREE_TYPE (x);
2587 tree visdecl = b->decl;
2588 tree vistype = TREE_TYPE (visdecl);
2589 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2590 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2591 b->inner_comp = false;
2594 /* If this is an external linkage declaration, we should check
2595 for compatibility with the type in the external scope before
2596 setting the type at this scope based on the visible
2597 information only. */
2598 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2600 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2601 b_ext = b_ext->shadowed;
2606 TREE_TYPE (b_use->decl) = b_use->u.type;
2609 if (duplicate_decls (x, b_use->decl))
2613 /* Save the updated type in the external scope and
2614 restore the proper type for this scope. */
2616 if (comptypes (vistype, type))
2617 thistype = composite_type (vistype, type);
2619 thistype = TREE_TYPE (b_use->decl);
2620 b_use->u.type = TREE_TYPE (b_use->decl);
2621 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2622 && DECL_BUILT_IN (b_use->decl))
2624 = build_type_attribute_variant (thistype,
2627 TREE_TYPE (b_use->decl) = thistype;
2632 goto skip_external_and_shadow_checks;
2635 /* All declarations with external linkage, and all external
2636 references, go in the external scope, no matter what scope is
2637 current. However, the binding in that scope is ignored for
2638 purposes of normal name lookup. A separate binding structure is
2639 created in the requested scope; this governs the normal
2640 visibility of the symbol.
2642 The binding in the externals scope is used exclusively for
2643 detecting duplicate declarations of the same object, no matter
2644 what scope they are in; this is what we do here. (C99 6.2.7p2:
2645 All declarations that refer to the same object or function shall
2646 have compatible type; otherwise, the behavior is undefined.) */
2647 if (DECL_EXTERNAL (x) || scope == file_scope)
2649 tree type = TREE_TYPE (x);
2652 bool type_saved = false;
2653 if (b && !B_IN_EXTERNAL_SCOPE (b)
2654 && (TREE_CODE (b->decl) == FUNCTION_DECL
2655 || TREE_CODE (b->decl) == VAR_DECL)
2656 && DECL_FILE_SCOPE_P (b->decl))
2659 vistype = TREE_TYPE (visdecl);
2661 if (scope != file_scope
2662 && !DECL_IN_SYSTEM_HEADER (x))
2663 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2665 while (b && !B_IN_EXTERNAL_SCOPE (b))
2667 /* If this decl might be modified, save its type. This is
2668 done here rather than when the decl is first bound
2669 because the type may change after first binding, through
2670 being completed or through attributes being added. If we
2671 encounter multiple such decls, only the first should have
2672 its type saved; the others will already have had their
2673 proper types saved and the types will not have changed as
2674 their scopes will not have been re-entered. */
2675 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2677 b->u.type = TREE_TYPE (b->decl);
2680 if (B_IN_FILE_SCOPE (b)
2681 && TREE_CODE (b->decl) == VAR_DECL
2682 && TREE_STATIC (b->decl)
2683 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2684 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2685 && TREE_CODE (type) == ARRAY_TYPE
2686 && TYPE_DOMAIN (type)
2687 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2688 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2690 /* Array type completed in inner scope, which should be
2691 diagnosed if the completion does not have size 1 and
2692 it does not get completed in the file scope. */
2693 b->inner_comp = true;
2698 /* If a matching external declaration has been found, set its
2699 type to the composite of all the types of that declaration.
2700 After the consistency checks, it will be reset to the
2701 composite of the visible types only. */
2702 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2704 TREE_TYPE (b->decl) = b->u.type;
2706 /* The point of the same_translation_unit_p check here is,
2707 we want to detect a duplicate decl for a construct like
2708 foo() { extern bar(); } ... static bar(); but not if
2709 they are in different translation units. In any case,
2710 the static does not go in the externals scope. */
2712 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2713 && duplicate_decls (x, b->decl))
2718 if (comptypes (vistype, type))
2719 thistype = composite_type (vistype, type);
2721 thistype = TREE_TYPE (b->decl);
2725 b->u.type = TREE_TYPE (b->decl);
2726 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2728 = build_type_attribute_variant (thistype,
2729 TYPE_ATTRIBUTES (b->u.type));
2730 TREE_TYPE (b->decl) = thistype;
2731 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
2735 else if (TREE_PUBLIC (x))
2737 if (visdecl && !b && duplicate_decls (x, visdecl))
2739 /* An external declaration at block scope referring to a
2740 visible entity with internal linkage. The composite
2741 type will already be correct for this scope, so we
2742 just need to fall through to make the declaration in
2749 bind (name, x, external_scope, /*invisible=*/true,
2750 /*nested=*/false, locus);
2756 if (TREE_CODE (x) != PARM_DECL)
2757 warn_if_shadowing (x);
2759 skip_external_and_shadow_checks:
2760 if (TREE_CODE (x) == TYPE_DECL)
2761 set_underlying_type (x);
2763 bind (name, x, scope, /*invisible=*/false, nested, locus);
2765 /* If x's type is incomplete because it's based on a
2766 structure or union which has not yet been fully declared,
2767 attach it to that structure or union type, so we can go
2768 back and complete the variable declaration later, if the
2769 structure or union gets fully declared.
2771 If the input is erroneous, we can have error_mark in the type
2772 slot (e.g. "f(void a, ...)") - that doesn't count as an
2774 if (TREE_TYPE (x) != error_mark_node
2775 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2777 tree element = TREE_TYPE (x);
2779 while (TREE_CODE (element) == ARRAY_TYPE)
2780 element = TREE_TYPE (element);
2781 element = TYPE_MAIN_VARIANT (element);
2783 if ((TREE_CODE (element) == RECORD_TYPE
2784 || TREE_CODE (element) == UNION_TYPE)
2785 && (TREE_CODE (x) != TYPE_DECL
2786 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2787 && !COMPLETE_TYPE_P (element))
2788 C_TYPE_INCOMPLETE_VARS (element)
2789 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2794 /* Record X as belonging to file scope.
2795 This is used only internally by the Objective-C front end,
2796 and is limited to its needs. duplicate_decls is not called;
2797 if there is any preexisting decl for this identifier, it is an ICE. */
2800 pushdecl_top_level (tree x)
2803 bool nested = false;
2804 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2806 name = DECL_NAME (x);
2808 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2810 if (TREE_PUBLIC (x))
2812 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false,
2817 bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION);
2823 implicit_decl_warning (tree id, tree olddecl)
2825 if (warn_implicit_function_declaration)
2830 warned = pedwarn (input_location, OPT_Wimplicit_function_declaration,
2831 "implicit declaration of function %qE", id);
2833 warned = warning (OPT_Wimplicit_function_declaration,
2834 G_("implicit declaration of function %qE"), id);
2835 if (olddecl && warned)
2836 locate_old_decl (olddecl);
2840 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2841 function of type int (). */
2844 implicitly_declare (location_t loc, tree functionid)
2846 struct c_binding *b;
2850 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2852 if (B_IN_SCOPE (b, external_scope))
2861 if (decl == error_mark_node)
2864 /* FIXME: Objective-C has weird not-really-builtin functions
2865 which are supposed to be visible automatically. They wind up
2866 in the external scope because they're pushed before the file
2867 scope gets created. Catch this here and rebind them into the
2869 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2871 bind (functionid, decl, file_scope,
2872 /*invisible=*/false, /*nested=*/true,
2873 DECL_SOURCE_LOCATION (decl));
2878 tree newtype = default_function_type;
2880 TREE_TYPE (decl) = b->u.type;
2881 /* Implicit declaration of a function already declared
2882 (somehow) in a different scope, or as a built-in.
2883 If this is the first time this has happened, warn;
2884 then recycle the old declaration but with the new type. */
2885 if (!C_DECL_IMPLICIT (decl))
2887 implicit_decl_warning (functionid, decl);
2888 C_DECL_IMPLICIT (decl) = 1;
2890 if (DECL_BUILT_IN (decl))
2892 newtype = build_type_attribute_variant (newtype,
2894 (TREE_TYPE (decl)));
2895 if (!comptypes (newtype, TREE_TYPE (decl)))
2897 warning_at (loc, 0, "incompatible implicit declaration of "
2898 "built-in function %qD", decl);
2899 newtype = TREE_TYPE (decl);
2904 if (!comptypes (newtype, TREE_TYPE (decl)))
2906 error_at (loc, "incompatible implicit declaration of function %qD", decl);
2907 locate_old_decl (decl);
2910 b->u.type = TREE_TYPE (decl);
2911 TREE_TYPE (decl) = newtype;
2912 bind (functionid, decl, current_scope,
2913 /*invisible=*/false, /*nested=*/true,
2914 DECL_SOURCE_LOCATION (decl));
2919 /* Not seen before. */
2920 decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type);
2921 DECL_EXTERNAL (decl) = 1;
2922 TREE_PUBLIC (decl) = 1;
2923 C_DECL_IMPLICIT (decl) = 1;
2924 implicit_decl_warning (functionid, 0);
2925 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2927 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2929 /* C89 says implicit declarations are in the innermost block.
2930 So we record the decl in the standard fashion. */
2931 decl = pushdecl (decl);
2933 /* No need to call objc_check_decl here - it's a function type. */
2934 rest_of_decl_compilation (decl, 0, 0);
2936 /* Write a record describing this implicit function declaration
2937 to the prototypes file (if requested). */
2938 gen_aux_info_record (decl, 0, 1, 0);
2940 /* Possibly apply some default attributes to this implicit declaration. */
2941 decl_attributes (&decl, NULL_TREE, 0);
2946 /* Issue an error message for a reference to an undeclared variable
2947 ID, including a reference to a builtin outside of function-call
2948 context. Establish a binding of the identifier to error_mark_node
2949 in an appropriate scope, which will suppress further errors for the
2950 same identifier. The error message should be given location LOC. */
2952 undeclared_variable (location_t loc, tree id)
2954 static bool already = false;
2955 struct c_scope *scope;
2957 if (current_function_decl == 0)
2959 error_at (loc, "%qE undeclared here (not in a function)", id);
2960 scope = current_scope;
2964 if (!objc_diagnose_private_ivar (id))
2965 error_at (loc, "%qE undeclared (first use in this function)", id);
2968 inform (loc, "each undeclared identifier is reported only"
2969 " once for each function it appears in");
2973 /* If we are parsing old-style parameter decls, current_function_decl
2974 will be nonnull but current_function_scope will be null. */
2975 scope = current_function_scope ? current_function_scope : current_scope;
2977 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
2981 /* Subroutine of lookup_label, declare_label, define_label: construct a
2982 LABEL_DECL with all the proper frills. Also create a struct
2983 c_label_vars initialized for the current scope. */
2986 make_label (location_t location, tree name, bool defining,
2987 struct c_label_vars **p_label_vars)
2989 tree label = build_decl (location, LABEL_DECL, name, void_type_node);
2990 struct c_label_vars *label_vars;
2992 DECL_CONTEXT (label) = current_function_decl;
2993 DECL_MODE (label) = VOIDmode;
2995 label_vars = ggc_alloc_c_label_vars ();
2996 label_vars->shadowed = NULL;
2997 set_spot_bindings (&label_vars->label_bindings, defining);
2998 label_vars->decls_in_scope = make_tree_vector ();
2999 label_vars->gotos = VEC_alloc (c_goto_bindings_p, gc, 0);
3000 *p_label_vars = label_vars;
3005 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3006 Create one if none exists so far for the current function.
3007 This is called when a label is used in a goto expression or
3008 has its address taken. */
3011 lookup_label (tree name)
3014 struct c_label_vars *label_vars;
3016 if (current_function_scope == 0)
3018 error ("label %qE referenced outside of any function", name);
3022 /* Use a label already defined or ref'd with this name, but not if
3023 it is inherited from a containing function and wasn't declared
3025 label = I_LABEL_DECL (name);
3026 if (label && (DECL_CONTEXT (label) == current_function_decl
3027 || C_DECLARED_LABEL_FLAG (label)))
3029 /* If the label has only been declared, update its apparent
3030 location to point here, for better diagnostics if it
3031 turns out not to have been defined. */
3032 if (DECL_INITIAL (label) == NULL_TREE)
3033 DECL_SOURCE_LOCATION (label) = input_location;
3037 /* No label binding for that identifier; make one. */
3038 label = make_label (input_location, name, false, &label_vars);
3040 /* Ordinary labels go in the current function scope. */
3041 bind_label (name, label, current_function_scope, label_vars);
3046 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3050 warn_about_goto (location_t goto_loc, tree label, tree decl)
3052 if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3054 "jump into scope of identifier with variably modified type");
3056 warning_at (goto_loc, OPT_Wjump_misses_init,
3057 "jump skips variable initialization");
3058 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3059 inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl);
3062 /* Look up a label because of a goto statement. This is like
3063 lookup_label, but also issues any appropriate warnings. */
3066 lookup_label_for_goto (location_t loc, tree name)
3069 struct c_label_vars *label_vars;
3073 label = lookup_label (name);
3074 if (label == NULL_TREE)
3077 /* If we are jumping to a different function, we can't issue any
3079 if (DECL_CONTEXT (label) != current_function_decl)
3081 gcc_assert (C_DECLARED_LABEL_FLAG (label));
3085 label_vars = I_LABEL_BINDING (name)->u.label;
3087 /* If the label has not yet been defined, then push this goto on a
3088 list for possible later warnings. */
3089 if (label_vars->label_bindings.scope == NULL)
3091 struct c_goto_bindings *g;
3093 g = ggc_alloc_c_goto_bindings ();
3095 set_spot_bindings (&g->goto_bindings, true);
3096 VEC_safe_push (c_goto_bindings_p, gc, label_vars->gotos, g);
3100 /* If there are any decls in label_vars->decls_in_scope, then this
3101 goto has missed the declaration of the decl. This happens for a
3107 Issue a warning or error. */
3108 FOR_EACH_VEC_ELT (tree, label_vars->decls_in_scope, ix, decl)
3109 warn_about_goto (loc, label, decl);
3111 if (label_vars->label_bindings.left_stmt_expr)
3113 error_at (loc, "jump into statement expression");
3114 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3120 /* Make a label named NAME in the current function, shadowing silently
3121 any that may be inherited from containing functions or containing
3122 scopes. This is called for __label__ declarations. */
3125 declare_label (tree name)
3127 struct c_binding *b = I_LABEL_BINDING (name);
3129 struct c_label_vars *label_vars;
3131 /* Check to make sure that the label hasn't already been declared
3133 if (b && B_IN_CURRENT_SCOPE (b))
3135 error ("duplicate label declaration %qE", name);
3136 locate_old_decl (b->decl);
3138 /* Just use the previous declaration. */
3142 label = make_label (input_location, name, false, &label_vars);
3143 C_DECLARED_LABEL_FLAG (label) = 1;
3145 /* Declared labels go in the current scope. */
3146 bind_label (name, label, current_scope, label_vars);
3151 /* When we define a label, issue any appropriate warnings if there are
3152 any gotos earlier in the function which jump to this label. */
3155 check_earlier_gotos (tree label, struct c_label_vars* label_vars)
3158 struct c_goto_bindings *g;
3160 FOR_EACH_VEC_ELT (c_goto_bindings_p, label_vars->gotos, ix, g)
3162 struct c_binding *b;
3163 struct c_scope *scope;
3165 /* We have a goto to this label. The goto is going forward. In
3166 g->scope, the goto is going to skip any binding which was
3167 defined after g->bindings_in_scope. */
3168 for (b = g->goto_bindings.scope->bindings;
3169 b != g->goto_bindings.bindings_in_scope;
3172 if (decl_jump_unsafe (b->decl))
3173 warn_about_goto (g->loc, label, b->decl);
3176 /* We also need to warn about decls defined in any scopes
3177 between the scope of the label and the scope of the goto. */
3178 for (scope = label_vars->label_bindings.scope;
3179 scope != g->goto_bindings.scope;
3180 scope = scope->outer)
3182 gcc_assert (scope != NULL);
3183 if (scope == label_vars->label_bindings.scope)
3184 b = label_vars->label_bindings.bindings_in_scope;
3186 b = scope->bindings;
3187 for (; b != NULL; b = b->prev)
3189 if (decl_jump_unsafe (b->decl))
3190 warn_about_goto (g->loc, label, b->decl);
3194 if (g->goto_bindings.stmt_exprs > 0)
3196 error_at (g->loc, "jump into statement expression");
3197 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here",
3202 /* Now that the label is defined, we will issue warnings about
3203 subsequent gotos to this label when we see them. */
3204 VEC_truncate (c_goto_bindings_p, label_vars->gotos, 0);
3205 label_vars->gotos = NULL;
3208 /* Define a label, specifying the location in the source file.
3209 Return the LABEL_DECL node for the label, if the definition is valid.
3210 Otherwise return 0. */
3213 define_label (location_t location, tree name)
3215 /* Find any preexisting label with this name. It is an error
3216 if that label has already been defined in this function, or
3217 if there is a containing function with a declared label with
3219 tree label = I_LABEL_DECL (name);
3222 && ((DECL_CONTEXT (label) == current_function_decl
3223 && DECL_INITIAL (label) != 0)
3224 || (DECL_CONTEXT (label) != current_function_decl
3225 && C_DECLARED_LABEL_FLAG (label))))
3227 error_at (location, "duplicate label %qD", label);
3228 locate_old_decl (label);
3231 else if (label && DECL_CONTEXT (label) == current_function_decl)
3233 struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label;
3235 /* The label has been used or declared already in this function,
3236 but not defined. Update its location to point to this
3238 DECL_SOURCE_LOCATION (label) = location;
3239 set_spot_bindings (&label_vars->label_bindings, true);
3241 /* Issue warnings as required about any goto statements from
3242 earlier in the function. */
3243 check_earlier_gotos (label, label_vars);
3247 struct c_label_vars *label_vars;
3249 /* No label binding for that identifier; make one. */
3250 label = make_label (location, name, true, &label_vars);
3252 /* Ordinary labels go in the current function scope. */
3253 bind_label (name, label, current_function_scope, label_vars);
3256 if (!in_system_header && lookup_name (name))
3257 warning_at (location, OPT_Wtraditional,
3258 "traditional C lacks a separate namespace "
3259 "for labels, identifier %qE conflicts", name);
3261 /* Mark label as having been defined. */
3262 DECL_INITIAL (label) = error_mark_node;
3266 /* Get the bindings for a new switch statement. This is used to issue
3267 warnings as appropriate for jumps from the switch to case or
3270 struct c_spot_bindings *
3271 c_get_switch_bindings (void)
3273 struct c_spot_bindings *switch_bindings;
3275 switch_bindings = XNEW (struct c_spot_bindings);
3276 set_spot_bindings (switch_bindings, true);
3277 return switch_bindings;
3281 c_release_switch_bindings (struct c_spot_bindings *bindings)
3283 gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr);
3287 /* This is called at the point of a case or default label to issue
3288 warnings about decls as needed. It returns true if it found an
3289 error, not just a warning. */
3292 c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings,
3293 location_t switch_loc, location_t case_loc)
3296 struct c_scope *scope;
3299 for (scope = current_scope;
3300 scope != switch_bindings->scope;
3301 scope = scope->outer)
3303 struct c_binding *b;
3305 gcc_assert (scope != NULL);
3306 for (b = scope->bindings; b != NULL; b = b->prev)
3308 if (decl_jump_unsafe (b->decl))
3310 if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE))
3314 ("switch jumps into scope of identifier with "
3315 "variably modified type"));
3318 warning_at (case_loc, OPT_Wjump_misses_init,
3319 "switch jumps over variable initialization");
3320 inform (switch_loc, "switch starts here");
3321 inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here",
3327 if (switch_bindings->stmt_exprs > 0)
3330 error_at (case_loc, "switch jumps into statement expression");
3331 inform (switch_loc, "switch starts here");
3337 /* Given NAME, an IDENTIFIER_NODE,
3338 return the structure (or union or enum) definition for that name.
3339 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3340 CODE says which kind of type the caller wants;
3341 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3342 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3343 location where the tag was defined.
3344 If the wrong kind of type is found, an error is reported. */
3347 lookup_tag (enum tree_code code, tree name, int thislevel_only,
3350 struct c_binding *b = I_TAG_BINDING (name);
3356 /* We only care about whether it's in this level if
3357 thislevel_only was set or it might be a type clash. */
3358 if (thislevel_only || TREE_CODE (b->decl) != code)
3360 /* For our purposes, a tag in the external scope is the same as
3361 a tag in the file scope. (Primarily relevant to Objective-C
3362 and its builtin structure tags, which get pushed before the
3363 file scope is created.) */
3364 if (B_IN_CURRENT_SCOPE (b)
3365 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
3369 if (thislevel_only && !thislevel)
3372 if (TREE_CODE (b->decl) != code)
3374 /* Definition isn't the kind we were looking for. */
3375 pending_invalid_xref = name;
3376 pending_invalid_xref_location = input_location;
3378 /* If in the same binding level as a declaration as a tag
3379 of a different type, this must not be allowed to
3380 shadow that tag, so give the error immediately.
3381 (For example, "struct foo; union foo;" is invalid.) */
3383 pending_xref_error ();
3392 /* Print an error message now
3393 for a recent invalid struct, union or enum cross reference.
3394 We don't print them immediately because they are not invalid
3395 when used in the `struct foo;' construct for shadowing. */
3398 pending_xref_error (void)
3400 if (pending_invalid_xref != 0)
3401 error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag",
3402 pending_invalid_xref);
3403 pending_invalid_xref = 0;
3407 /* Look up NAME in the current scope and its superiors
3408 in the namespace of variables, functions and typedefs.
3409 Return a ..._DECL node of some kind representing its definition,
3410 or return 0 if it is undefined. */
3413 lookup_name (tree name)
3415 struct c_binding *b = I_SYMBOL_BINDING (name);
3416 if (b && !b->invisible)
3421 /* Similar to `lookup_name' but look only at the indicated scope. */
3424 lookup_name_in_scope (tree name, struct c_scope *scope)
3426 struct c_binding *b;
3428 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
3429 if (B_IN_SCOPE (b, scope))
3434 /* Create the predefined scalar types of C,
3435 and some nodes representing standard constants (0, 1, (void *) 0).
3436 Initialize the global scope.
3437 Make definitions for built-in primitive functions. */
3440 c_init_decl_processing (void)
3442 location_t save_loc = input_location;
3444 /* Initialize reserved words for parser. */
3447 current_function_decl = 0;
3449 gcc_obstack_init (&parser_obstack);
3451 /* Make the externals scope. */
3453 external_scope = current_scope;
3455 /* Declarations from c_common_nodes_and_builtins must not be associated
3456 with this input file, lest we get differences between using and not
3457 using preprocessed headers. */
3458 input_location = BUILTINS_LOCATION;
3460 build_common_tree_nodes (flag_signed_char);
3462 c_common_nodes_and_builtins ();
3464 /* In C, comparisons and TRUTH_* expressions have type int. */
3465 truthvalue_type_node = integer_type_node;
3466 truthvalue_true_node = integer_one_node;
3467 truthvalue_false_node = integer_zero_node;
3469 /* Even in C99, which has a real boolean type. */
3470 pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"),
3471 boolean_type_node));
3473 input_location = save_loc;
3475 pedantic_lvalues = true;
3477 make_fname_decl = c_make_fname_decl;
3478 start_fname_decls ();
3481 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3482 give the decl, NAME is the initialization string and TYPE_DEP
3483 indicates whether NAME depended on the type of the function. As we
3484 don't yet implement delayed emission of static data, we mark the
3485 decl as emitted so it is not placed in the output. Anything using
3486 it must therefore pull out the STRING_CST initializer directly.
3490 c_make_fname_decl (location_t loc, tree id, int type_dep)
3492 const char *name = fname_as_string (type_dep);
3493 tree decl, type, init;
3494 size_t length = strlen (name);
3496 type = build_array_type (char_type_node,
3497 build_index_type (size_int (length)));
3498 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
3500 decl = build_decl (loc, VAR_DECL, id, type);
3502 TREE_STATIC (decl) = 1;
3503 TREE_READONLY (decl) = 1;
3504 DECL_ARTIFICIAL (decl) = 1;
3506 init = build_string (length + 1, name);
3507 free (CONST_CAST (char *, name));
3508 TREE_TYPE (init) = type;
3509 DECL_INITIAL (decl) = init;
3511 TREE_USED (decl) = 1;
3513 if (current_function_decl
3514 /* For invalid programs like this:
3517 const char* p = __FUNCTION__;
3519 the __FUNCTION__ is believed to appear in K&R style function
3520 parameter declarator. In that case we still don't have
3522 && (!seen_error () || current_function_scope))
3524 DECL_CONTEXT (decl) = current_function_decl;
3525 bind (id, decl, current_function_scope,
3526 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
3529 finish_decl (decl, loc, init, NULL_TREE, NULL_TREE);
3535 c_builtin_function (tree decl)
3537 tree type = TREE_TYPE (decl);
3538 tree id = DECL_NAME (decl);
3540 const char *name = IDENTIFIER_POINTER (id);
3541 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
3543 /* Should never be called on a symbol with a preexisting meaning. */
3544 gcc_assert (!I_SYMBOL_BINDING (id));
3546 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false,
3549 /* Builtins in the implementation namespace are made visible without
3550 needing to be explicitly declared. See push_file_scope. */
3551 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3553 DECL_CHAIN (decl) = visible_builtins;
3554 visible_builtins = decl;
3561 c_builtin_function_ext_scope (tree decl)
3563 tree type = TREE_TYPE (decl);
3564 tree id = DECL_NAME (decl);
3566 const char *name = IDENTIFIER_POINTER (id);
3567 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
3569 /* Should never be called on a symbol with a preexisting meaning. */
3570 gcc_assert (!I_SYMBOL_BINDING (id));
3572 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false,
3575 /* Builtins in the implementation namespace are made visible without
3576 needing to be explicitly declared. See push_file_scope. */
3577 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3579 DECL_CHAIN (decl) = visible_builtins;
3580 visible_builtins = decl;
3586 /* Called when a declaration is seen that contains no names to declare.
3587 If its type is a reference to a structure, union or enum inherited
3588 from a containing scope, shadow that tag name for the current scope
3589 with a forward reference.
3590 If its type defines a new named structure or union
3591 or defines an enum, it is valid but we need not do anything here.
3592 Otherwise, it is an error. */
3595 shadow_tag (const struct c_declspecs *declspecs)
3597 shadow_tag_warned (declspecs, 0);
3600 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3603 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
3605 bool found_tag = false;
3607 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
3609 tree value = declspecs->type;
3610 enum tree_code code = TREE_CODE (value);
3612 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3613 /* Used to test also that TYPE_SIZE (value) != 0.
3614 That caused warning for `struct foo;' at top level in the file. */
3616 tree name = TYPE_NAME (value);
3621 if (declspecs->restrict_p)
3623 error ("invalid use of %<restrict%>");
3629 if (warned != 1 && code != ENUMERAL_TYPE)
3630 /* Empty unnamed enum OK */
3632 pedwarn (input_location, 0,
3633 "unnamed struct/union that defines no instances");
3637 else if (declspecs->typespec_kind != ctsk_tagdef
3638 && declspecs->typespec_kind != ctsk_tagfirstref
3639 && declspecs->storage_class != csc_none)
3642 pedwarn (input_location, 0,
3643 "empty declaration with storage class specifier "
3644 "does not redeclare tag");
3646 pending_xref_error ();
3648 else if (declspecs->typespec_kind != ctsk_tagdef
3649 && declspecs->typespec_kind != ctsk_tagfirstref
3650 && (declspecs->const_p
3651 || declspecs->volatile_p
3652 || declspecs->restrict_p
3653 || declspecs->address_space))
3656 pedwarn (input_location, 0,
3657 "empty declaration with type qualifier "
3658 "does not redeclare tag");
3660 pending_xref_error ();
3664 pending_invalid_xref = 0;
3665 t = lookup_tag (code, name, 1, NULL);
3669 t = make_node (code);
3670 pushtag (input_location, name, t);
3676 if (warned != 1 && !in_system_header)
3678 pedwarn (input_location, 0,
3679 "useless type name in empty declaration");
3684 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
3686 pedwarn (input_location, 0, "useless type name in empty declaration");
3690 pending_invalid_xref = 0;
3692 if (declspecs->inline_p)
3694 error ("%<inline%> in empty declaration");
3698 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
3700 error ("%<auto%> in file-scope empty declaration");
3704 if (current_scope == file_scope && declspecs->storage_class == csc_register)
3706 error ("%<register%> in file-scope empty declaration");
3710 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
3712 warning (0, "useless storage class specifier in empty declaration");
3716 if (!warned && !in_system_header && declspecs->thread_p)
3718 warning (0, "useless %<__thread%> in empty declaration");
3722 if (!warned && !in_system_header && (declspecs->const_p
3723 || declspecs->volatile_p
3724 || declspecs->restrict_p
3725 || declspecs->address_space))
3727 warning (0, "useless type qualifier in empty declaration");
3734 pedwarn (input_location, 0, "empty declaration");
3739 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3740 bits. SPECS represents declaration specifiers that the grammar
3741 only permits to contain type qualifiers and attributes. */
3744 quals_from_declspecs (const struct c_declspecs *specs)
3746 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3747 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3748 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0)
3749 | (ENCODE_QUAL_ADDR_SPACE (specs->address_space)));
3750 gcc_assert (!specs->type
3751 && !specs->decl_attr
3752 && specs->typespec_word == cts_none
3753 && specs->storage_class == csc_none
3754 && !specs->typedef_p
3755 && !specs->explicit_signed_p
3756 && !specs->deprecated_p
3758 && !specs->long_long_p
3761 && !specs->unsigned_p
3762 && !specs->complex_p
3764 && !specs->thread_p);
3768 /* Construct an array declarator. LOC is the location of the
3769 beginning of the array (usually the opening brace). EXPR is the
3770 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3771 inside the [] (to be applied to the pointer to which a parameter
3772 array is converted). STATIC_P is true if "static" is inside the
3773 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3774 VLA of unspecified length which is nevertheless a complete type,
3775 false otherwise. The field for the contained declarator is left to
3776 be filled in by set_array_declarator_inner. */
3778 struct c_declarator *
3779 build_array_declarator (location_t loc,
3780 tree expr, struct c_declspecs *quals, bool static_p,
3783 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3784 struct c_declarator);
3785 declarator->id_loc = loc;
3786 declarator->kind = cdk_array;
3787 declarator->declarator = 0;
3788 declarator->u.array.dimen = expr;
3791 declarator->u.array.attrs = quals->attrs;
3792 declarator->u.array.quals = quals_from_declspecs (quals);
3796 declarator->u.array.attrs = NULL_TREE;
3797 declarator->u.array.quals = 0;
3799 declarator->u.array.static_p = static_p;
3800 declarator->u.array.vla_unspec_p = vla_unspec_p;
3803 if (static_p || quals != NULL)
3804 pedwarn (loc, OPT_pedantic,
3805 "ISO C90 does not support %<static%> or type "
3806 "qualifiers in parameter array declarators");
3808 pedwarn (loc, OPT_pedantic,
3809 "ISO C90 does not support %<[*]%> array declarators");
3813 if (!current_scope->parm_flag)
3816 error_at (loc, "%<[*]%> not allowed in other than "
3817 "function prototype scope");
3818 declarator->u.array.vla_unspec_p = false;
3821 current_scope->had_vla_unspec = true;
3826 /* Set the contained declarator of an array declarator. DECL is the
3827 declarator, as constructed by build_array_declarator; INNER is what
3828 appears on the left of the []. */
3830 struct c_declarator *
3831 set_array_declarator_inner (struct c_declarator *decl,
3832 struct c_declarator *inner)
3834 decl->declarator = inner;
3838 /* INIT is a constructor that forms DECL's initializer. If the final
3839 element initializes a flexible array field, add the size of that
3840 initializer to DECL's size. */
3843 add_flexible_array_elts_to_size (tree decl, tree init)
3847 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3850 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3851 type = TREE_TYPE (elt);
3852 if (TREE_CODE (type) == ARRAY_TYPE
3853 && TYPE_SIZE (type) == NULL_TREE
3854 && TYPE_DOMAIN (type) != NULL_TREE
3855 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3857 complete_array_type (&type, elt, false);
3859 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3860 DECL_SIZE_UNIT (decl)
3861 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3865 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3866 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3867 before the type name, and set *EXPR_CONST_OPERANDS, if
3868 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3869 appear in a constant expression. */
3872 groktypename (struct c_type_name *type_name, tree *expr,
3873 bool *expr_const_operands)
3876 tree attrs = type_name->specs->attrs;
3878 type_name->specs->attrs = NULL_TREE;
3880 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3881 false, NULL, &attrs, expr, expr_const_operands,
3884 /* Apply attributes. */
3885 decl_attributes (&type, attrs, 0);
3890 /* Decode a declarator in an ordinary declaration or data definition.
3891 This is called as soon as the type information and variable name
3892 have been parsed, before parsing the initializer if any.
3893 Here we create the ..._DECL node, fill in its type,
3894 and put it on the list of decls for the current context.
3895 The ..._DECL node is returned as the value.
3897 Exception: for arrays where the length is not specified,
3898 the type is left null, to be filled in by `finish_decl'.
3900 Function definitions do not come here; they go to start_function
3901 instead. However, external and forward declarations of functions
3902 do go through here. Structure field declarations are done by
3903 grokfield and not through here. */
3906 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3907 bool initialized, tree attributes)
3911 tree expr = NULL_TREE;
3912 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
3914 /* An object declared as __attribute__((deprecated)) suppresses
3915 warnings of uses of other deprecated items. */
3916 if (lookup_attribute ("deprecated", attributes))
3917 deprecated_state = DEPRECATED_SUPPRESS;
3919 decl = grokdeclarator (declarator, declspecs,
3920 NORMAL, initialized, NULL, &attributes, &expr, NULL,
3928 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
3929 warning (OPT_Wmain, "%q+D is usually a function", decl);
3932 /* Is it valid for this decl to have an initializer at all?
3933 If not, set INITIALIZED to zero, which will indirectly
3934 tell 'finish_decl' to ignore the initializer once it is parsed. */
3935 switch (TREE_CODE (decl))
3938 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3943 error ("function %qD is initialized like a variable", decl);
3948 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3949 error ("parameter %qD is initialized", decl);
3954 /* Don't allow initializations for incomplete types except for
3955 arrays which might be completed by the initialization. */
3957 /* This can happen if the array size is an undefined macro.
3958 We already gave a warning, so we don't need another one. */
3959 if (TREE_TYPE (decl) == error_mark_node)
3961 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3963 /* A complete type is ok if size is fixed. */
3965 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3966 || C_DECL_VARIABLE_SIZE (decl))
3968 error ("variable-sized object may not be initialized");
3972 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3974 error ("variable %qD has initializer but incomplete type", decl);
3977 else if (C_DECL_VARIABLE_SIZE (decl))
3979 /* Although C99 is unclear about whether incomplete arrays
3980 of VLAs themselves count as VLAs, it does not make
3981 sense to permit them to be initialized given that
3982 ordinary VLAs may not be initialized. */
3983 error ("variable-sized object may not be initialized");
3990 if (current_scope == file_scope)
3991 TREE_STATIC (decl) = 1;
3993 /* Tell 'pushdecl' this is an initialized decl
3994 even though we don't yet have the initializer expression.
3995 Also tell 'finish_decl' it may store the real initializer. */
3996 DECL_INITIAL (decl) = error_mark_node;
3999 /* If this is a function declaration, write a record describing it to the
4000 prototypes file (if requested). */
4002 if (TREE_CODE (decl) == FUNCTION_DECL)
4003 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
4005 /* ANSI specifies that a tentative definition which is not merged with
4006 a non-tentative definition behaves exactly like a definition with an
4007 initializer equal to zero. (Section 3.7.2)
4009 -fno-common gives strict ANSI behavior, though this tends to break
4010 a large body of code that grew up without this rule.
4012 Thread-local variables are never common, since there's no entrenched
4013 body of code to break, and it allows more efficient variable references
4014 in the presence of dynamic linking. */
4016 if (TREE_CODE (decl) == VAR_DECL
4018 && TREE_PUBLIC (decl)
4019 && !DECL_THREAD_LOCAL_P (decl)
4021 DECL_COMMON (decl) = 1;
4023 /* Set attributes here so if duplicate decl, will have proper attributes. */
4024 decl_attributes (&decl, attributes, 0);
4026 /* Handle gnu_inline attribute. */
4027 if (declspecs->inline_p
4028 && !flag_gnu89_inline
4029 && TREE_CODE (decl) == FUNCTION_DECL
4030 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
4031 || current_function_decl))
4033 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
4035 else if (declspecs->storage_class != csc_static)
4036 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
4039 if (TREE_CODE (decl) == FUNCTION_DECL
4040 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
4042 struct c_declarator *ce = declarator;
4044 if (ce->kind == cdk_pointer)
4045 ce = declarator->declarator;
4046 if (ce->kind == cdk_function)
4048 tree args = ce->u.arg_info->parms;
4049 for (; args; args = DECL_CHAIN (args))
4051 tree type = TREE_TYPE (args);
4052 if (type && INTEGRAL_TYPE_P (type)
4053 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4054 DECL_ARG_TYPE (args) = integer_type_node;
4059 if (TREE_CODE (decl) == FUNCTION_DECL
4060 && DECL_DECLARED_INLINE_P (decl)
4061 && DECL_UNINLINABLE (decl)
4062 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4063 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
4066 /* C99 6.7.4p3: An inline definition of a function with external
4067 linkage shall not contain a definition of a modifiable object
4068 with static storage duration... */
4069 if (TREE_CODE (decl) == VAR_DECL
4070 && current_scope != file_scope
4071 && TREE_STATIC (decl)
4072 && !TREE_READONLY (decl)
4073 && DECL_DECLARED_INLINE_P (current_function_decl)
4074 && DECL_EXTERNAL (current_function_decl))
4075 record_inline_static (input_location, current_function_decl,
4076 decl, csi_modifiable);
4078 if (c_dialect_objc ()
4079 && (TREE_CODE (decl) == VAR_DECL
4080 || TREE_CODE (decl) == FUNCTION_DECL))
4081 objc_check_global_decl (decl);
4083 /* Add this decl to the current scope.
4084 TEM may equal DECL or it may be a previous decl of the same name. */
4085 tem = pushdecl (decl);
4087 if (initialized && DECL_EXTERNAL (tem))
4089 DECL_EXTERNAL (tem) = 0;
4090 TREE_STATIC (tem) = 1;
4096 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4097 DECL or the non-array element type if DECL is an uninitialized array.
4098 If that type has a const member, diagnose this. */
4101 diagnose_uninitialized_cst_member (tree decl, tree type)
4104 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
4107 if (TREE_CODE (field) != FIELD_DECL)
4109 field_type = strip_array_types (TREE_TYPE (field));
4111 if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST)
4113 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4114 "uninitialized const member in %qT is invalid in C++",
4115 strip_array_types (TREE_TYPE (decl)));
4116 inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field);
4119 if (TREE_CODE (field_type) == RECORD_TYPE
4120 || TREE_CODE (field_type) == UNION_TYPE)
4121 diagnose_uninitialized_cst_member (decl, field_type);
4125 /* Finish processing of a declaration;
4126 install its initial value.
4127 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4128 If the length of an array type is not known before,
4129 it must be determined now, from the initial value, or it is an error.
4131 INIT_LOC is the location of the initial value. */
4134 finish_decl (tree decl, location_t init_loc, tree init,
4135 tree origtype, tree asmspec_tree)
4138 bool was_incomplete = (DECL_SIZE (decl) == 0);
4139 const char *asmspec = 0;
4141 /* If a name was specified, get the string. */
4142 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4143 && DECL_FILE_SCOPE_P (decl))
4144 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4146 asmspec = TREE_STRING_POINTER (asmspec_tree);
4148 if (TREE_CODE (decl) == VAR_DECL
4149 && TREE_STATIC (decl)
4150 && global_bindings_p ())
4151 /* So decl is a global variable. Record the types it uses
4152 so that we can decide later to emit debug info for them. */
4153 record_types_used_by_current_var_decl (decl);
4155 /* If `start_decl' didn't like having an initialization, ignore it now. */
4156 if (init != 0 && DECL_INITIAL (decl) == 0)
4159 /* Don't crash if parm is initialized. */
4160 if (TREE_CODE (decl) == PARM_DECL)
4164 store_init_value (init_loc, decl, init, origtype);
4166 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
4167 || TREE_CODE (decl) == FUNCTION_DECL
4168 || TREE_CODE (decl) == FIELD_DECL))
4169 objc_check_decl (decl);
4171 type = TREE_TYPE (decl);
4173 /* Deduce size of array from initialization, if not already known. */
4174 if (TREE_CODE (type) == ARRAY_TYPE
4175 && TYPE_DOMAIN (type) == 0
4176 && TREE_CODE (decl) != TYPE_DECL)
4179 = (TREE_STATIC (decl)
4180 /* Even if pedantic, an external linkage array
4181 may have incomplete type at first. */
4182 ? pedantic && !TREE_PUBLIC (decl)
4183 : !DECL_EXTERNAL (decl));
4185 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
4188 /* Get the completed type made by complete_array_type. */
4189 type = TREE_TYPE (decl);
4194 error ("initializer fails to determine size of %q+D", decl);
4199 error ("array size missing in %q+D", decl);
4200 /* If a `static' var's size isn't known,
4201 make it extern as well as static, so it does not get
4203 If it is not `static', then do not mark extern;
4204 finish_incomplete_decl will give it a default size
4205 and it will get allocated. */
4206 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4207 DECL_EXTERNAL (decl) = 1;
4211 error ("zero or negative size array %q+D", decl);
4215 /* For global variables, update the copy of the type that
4216 exists in the binding. */
4217 if (TREE_PUBLIC (decl))
4219 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
4220 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
4221 b_ext = b_ext->shadowed;
4225 b_ext->u.type = composite_type (b_ext->u.type, type);
4227 b_ext->u.type = type;
4236 if (DECL_INITIAL (decl))
4237 TREE_TYPE (DECL_INITIAL (decl)) = type;
4239 layout_decl (decl, 0);
4242 if (TREE_CODE (decl) == VAR_DECL)
4244 if (init && TREE_CODE (init) == CONSTRUCTOR)
4245 add_flexible_array_elts_to_size (decl, init);
4247 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
4248 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
4249 layout_decl (decl, 0);
4251 if (DECL_SIZE (decl) == 0
4252 /* Don't give an error if we already gave one earlier. */
4253 && TREE_TYPE (decl) != error_mark_node
4254 && (TREE_STATIC (decl)
4255 /* A static variable with an incomplete type
4256 is an error if it is initialized.
4257 Also if it is not file scope.
4258 Otherwise, let it through, but if it is not `extern'
4259 then it may cause an error message later. */
4260 ? (DECL_INITIAL (decl) != 0
4261 || !DECL_FILE_SCOPE_P (decl))
4262 /* An automatic variable with an incomplete type
4264 : !DECL_EXTERNAL (decl)))
4266 error ("storage size of %q+D isn%'t known", decl);
4267 TREE_TYPE (decl) = error_mark_node;
4270 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4271 && DECL_SIZE (decl) != 0)
4273 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4274 constant_expression_warning (DECL_SIZE (decl));
4277 error ("storage size of %q+D isn%'t constant", decl);
4278 TREE_TYPE (decl) = error_mark_node;
4282 if (TREE_USED (type))
4284 TREE_USED (decl) = 1;
4285 DECL_READ_P (decl) = 1;
4289 /* If this is a function and an assembler name is specified, reset DECL_RTL
4290 so we can give it its new name. Also, update built_in_decls if it
4291 was a normal built-in. */
4292 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4294 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4295 set_builtin_user_assembler_name (decl, asmspec);
4296 set_user_assembler_name (decl, asmspec);
4299 /* If #pragma weak was used, mark the decl weak now. */
4300 maybe_apply_pragma_weak (decl);
4302 /* Output the assembler code and/or RTL code for variables and functions,
4303 unless the type is an undefined structure or union.
4304 If not, it will get done when the type is completed. */
4306 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4308 /* Determine the ELF visibility. */
4309 if (TREE_PUBLIC (decl))
4310 c_determine_visibility (decl);
4312 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4313 if (c_dialect_objc ())
4314 objc_check_decl (decl);
4318 /* If this is not a static variable, issue a warning.
4319 It doesn't make any sense to give an ASMSPEC for an
4320 ordinary, non-register local variable. Historically,
4321 GCC has accepted -- but ignored -- the ASMSPEC in
4323 if (!DECL_FILE_SCOPE_P (decl)
4324 && TREE_CODE (decl) == VAR_DECL
4325 && !C_DECL_REGISTER (decl)
4326 && !TREE_STATIC (decl))
4327 warning (0, "ignoring asm-specifier for non-static local "
4328 "variable %q+D", decl);
4330 set_user_assembler_name (decl, asmspec);
4333 if (DECL_FILE_SCOPE_P (decl))
4335 if (DECL_INITIAL (decl) == NULL_TREE
4336 || DECL_INITIAL (decl) == error_mark_node)
4337 /* Don't output anything
4338 when a tentative file-scope definition is seen.
4339 But at end of compilation, do output code for them. */
4340 DECL_DEFER_OUTPUT (decl) = 1;
4341 rest_of_decl_compilation (decl, true, 0);
4345 /* In conjunction with an ASMSPEC, the `register'
4346 keyword indicates that we should place the variable
4347 in a particular register. */
4348 if (asmspec && C_DECL_REGISTER (decl))
4350 DECL_HARD_REGISTER (decl) = 1;
4351 /* This cannot be done for a structure with volatile
4352 fields, on which DECL_REGISTER will have been
4354 if (!DECL_REGISTER (decl))
4355 error ("cannot put object with volatile field into register");
4358 if (TREE_CODE (decl) != FUNCTION_DECL)
4360 /* If we're building a variable sized type, and we might be
4361 reachable other than via the top of the current binding
4362 level, then create a new BIND_EXPR so that we deallocate
4363 the object at the right time. */
4364 /* Note that DECL_SIZE can be null due to errors. */
4365 if (DECL_SIZE (decl)
4366 && !TREE_CONSTANT (DECL_SIZE (decl))
4367 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
4370 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
4371 TREE_SIDE_EFFECTS (bind) = 1;
4373 BIND_EXPR_BODY (bind) = push_stmt_list ();
4375 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
4381 if (!DECL_FILE_SCOPE_P (decl))
4383 /* Recompute the RTL of a local array now
4384 if it used to be an incomplete type. */
4386 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
4388 /* If we used it already as memory, it must stay in memory. */
4389 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4390 /* If it's still incomplete now, no init will save it. */
4391 if (DECL_SIZE (decl) == 0)
4392 DECL_INITIAL (decl) = 0;
4397 if (TREE_CODE (decl) == TYPE_DECL)
4399 if (!DECL_FILE_SCOPE_P (decl)
4400 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
4401 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
4403 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
4406 /* At the end of a declaration, throw away any variable type sizes
4407 of types defined inside that declaration. There is no use
4408 computing them in the following function definition. */
4409 if (current_scope == file_scope)
4410 get_pending_sizes ();
4412 /* Install a cleanup (aka destructor) if one was given. */
4413 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
4415 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
4418 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
4419 tree cleanup_decl = lookup_name (cleanup_id);
4423 /* Build "cleanup(&decl)" for the destructor. */
4424 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
4425 vec = VEC_alloc (tree, gc, 1);
4426 VEC_quick_push (tree, vec, cleanup);
4427 cleanup = build_function_call_vec (DECL_SOURCE_LOCATION (decl),
4428 cleanup_decl, vec, NULL);
4429 VEC_free (tree, gc, vec);
4431 /* Don't warn about decl unused; the cleanup uses it. */
4432 TREE_USED (decl) = 1;
4433 TREE_USED (cleanup_decl) = 1;
4434 DECL_READ_P (decl) = 1;
4436 push_cleanup (decl, cleanup, false);
4441 && TREE_CODE (decl) == VAR_DECL
4442 && !DECL_EXTERNAL (decl)
4443 && DECL_INITIAL (decl) == NULL_TREE)
4445 type = strip_array_types (type);
4446 if (TREE_READONLY (decl))
4447 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4448 "uninitialized const %qD is invalid in C++", decl);
4449 else if ((TREE_CODE (type) == RECORD_TYPE
4450 || TREE_CODE (type) == UNION_TYPE)
4451 && C_TYPE_FIELDS_READONLY (type))
4452 diagnose_uninitialized_cst_member (decl, type);
4456 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
4459 grokparm (const struct c_parm *parm)
4461 tree attrs = parm->attrs;
4462 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
4463 NULL, &attrs, NULL, NULL, DEPRECATED_NORMAL);
4465 decl_attributes (&decl, attrs, 0);
4470 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4471 and push that on the current scope. */
4474 push_parm_decl (const struct c_parm *parm)
4476 tree attrs = parm->attrs;
4479 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
4480 &attrs, NULL, NULL, DEPRECATED_NORMAL);
4481 decl_attributes (&decl, attrs, 0);
4483 decl = pushdecl (decl);
4485 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
4488 /* Mark all the parameter declarations to date as forward decls.
4489 Also diagnose use of this extension. */
4492 mark_forward_parm_decls (void)
4494 struct c_binding *b;
4496 if (pedantic && !current_scope->warned_forward_parm_decls)
4498 pedwarn (input_location, OPT_pedantic,
4499 "ISO C forbids forward parameter declarations");
4500 current_scope->warned_forward_parm_decls = true;
4503 for (b = current_scope->bindings; b; b = b->prev)
4504 if (TREE_CODE (b->decl) == PARM_DECL)
4505 TREE_ASM_WRITTEN (b->decl) = 1;
4508 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4509 literal, which may be an incomplete array type completed by the
4510 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4511 literal. NON_CONST is true if the initializers contain something
4512 that cannot occur in a constant expression. */
4515 build_compound_literal (location_t loc, tree type, tree init, bool non_const)
4517 /* We do not use start_decl here because we have a type, not a declarator;
4518 and do not use finish_decl because the decl should be stored inside
4519 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4524 if (type == error_mark_node
4525 || init == error_mark_node)
4526 return error_mark_node;
4528 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
4529 DECL_EXTERNAL (decl) = 0;
4530 TREE_PUBLIC (decl) = 0;
4531 TREE_STATIC (decl) = (current_scope == file_scope);
4532 DECL_CONTEXT (decl) = current_function_decl;
4533 TREE_USED (decl) = 1;
4534 DECL_READ_P (decl) = 1;
4535 TREE_TYPE (decl) = type;
4536 TREE_READONLY (decl) = TYPE_READONLY (type);
4537 store_init_value (loc, decl, init, NULL_TREE);
4539 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4541 int failure = complete_array_type (&TREE_TYPE (decl),
4542 DECL_INITIAL (decl), true);
4543 gcc_assert (!failure);
4545 type = TREE_TYPE (decl);
4546 TREE_TYPE (DECL_INITIAL (decl)) = type;
4549 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
4550 return error_mark_node;
4552 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
4553 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
4554 TREE_SIDE_EFFECTS (complit) = 1;
4556 layout_decl (decl, 0);
4558 if (TREE_STATIC (decl))
4560 /* This decl needs a name for the assembler output. */
4561 set_compound_literal_name (decl);
4562 DECL_DEFER_OUTPUT (decl) = 1;
4563 DECL_COMDAT (decl) = 1;
4564 DECL_ARTIFICIAL (decl) = 1;
4565 DECL_IGNORED_P (decl) = 1;
4567 rest_of_decl_compilation (decl, 1, 0);
4572 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
4573 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
4579 /* Check the type of a compound literal. Here we just check that it
4580 is valid for C++. */
4583 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
4586 && (type_name->specs->typespec_kind == ctsk_tagdef
4587 || type_name->specs->typespec_kind == ctsk_tagfirstref))
4588 warning_at (loc, OPT_Wc___compat,
4589 "defining a type in a compound literal is invalid in C++");
4592 /* Determine whether TYPE is a structure with a flexible array member,
4593 or a union containing such a structure (possibly recursively). */
4596 flexible_array_type_p (tree type)
4599 switch (TREE_CODE (type))
4602 x = TYPE_FIELDS (type);
4605 while (DECL_CHAIN (x) != NULL_TREE)
4607 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
4608 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
4609 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
4610 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
4614 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x))
4616 if (flexible_array_type_p (TREE_TYPE (x)))
4625 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4626 replacing with appropriate values if they are invalid. */
4628 check_bitfield_type_and_width (tree *type, tree *width, tree orig_name)
4631 unsigned int max_width;
4632 unsigned HOST_WIDE_INT w;
4633 const char *name = (orig_name
4634 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
4635 : _("<anonymous>"));
4637 /* Detect and ignore out of range field width and process valid
4639 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)))
4641 error ("bit-field %qs width not an integer constant", name);
4642 *width = integer_one_node;
4646 if (TREE_CODE (*width) != INTEGER_CST)
4648 *width = c_fully_fold (*width, false, NULL);
4649 if (TREE_CODE (*width) == INTEGER_CST)
4650 pedwarn (input_location, OPT_pedantic,
4651 "bit-field %qs width not an integer constant expression",
4654 if (TREE_CODE (*width) != INTEGER_CST)
4656 error ("bit-field %qs width not an integer constant", name);
4657 *width = integer_one_node;
4659 constant_expression_warning (*width);
4660 if (tree_int_cst_sgn (*width) < 0)
4662 error ("negative width in bit-field %qs", name);
4663 *width = integer_one_node;
4665 else if (integer_zerop (*width) && orig_name)
4667 error ("zero width for bit-field %qs", name);
4668 *width = integer_one_node;
4672 /* Detect invalid bit-field type. */
4673 if (TREE_CODE (*type) != INTEGER_TYPE
4674 && TREE_CODE (*type) != BOOLEAN_TYPE
4675 && TREE_CODE (*type) != ENUMERAL_TYPE)
4677 error ("bit-field %qs has invalid type", name);
4678 *type = unsigned_type_node;
4681 type_mv = TYPE_MAIN_VARIANT (*type);
4682 if (!in_system_header
4683 && type_mv != integer_type_node
4684 && type_mv != unsigned_type_node
4685 && type_mv != boolean_type_node)
4686 pedwarn (input_location, OPT_pedantic,
4687 "type of bit-field %qs is a GCC extension", name);
4689 max_width = TYPE_PRECISION (*type);
4691 if (0 < compare_tree_int (*width, max_width))
4693 error ("width of %qs exceeds its type", name);
4695 *width = build_int_cst (NULL_TREE, w);
4698 w = tree_low_cst (*width, 1);
4700 if (TREE_CODE (*type) == ENUMERAL_TYPE)
4702 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
4704 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
4705 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
4706 warning (0, "%qs is narrower than values of its type", name);
4712 /* Print warning about variable length array if necessary. */
4715 warn_variable_length_array (tree name, tree size)
4717 int const_size = TREE_CONSTANT (size);
4719 if (!flag_isoc99 && pedantic && warn_vla != 0)
4724 pedwarn (input_location, OPT_Wvla,
4725 "ISO C90 forbids array %qE whose size "
4726 "can%'t be evaluated",
4729 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size "
4730 "can%'t be evaluated");
4735 pedwarn (input_location, OPT_Wvla,
4736 "ISO C90 forbids variable length array %qE",
4739 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array");
4742 else if (warn_vla > 0)
4748 "the size of array %qE can"
4749 "%'t be evaluated", name);
4752 "the size of array can %'t be evaluated");
4758 "variable length array %qE is used",
4762 "variable length array is used");
4767 /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to
4768 serve as the actual size-expression for a type or decl. This is
4769 like variable_size in stor-layout.c, but we make global_bindings_p
4770 return negative to avoid calls to that function from outside the
4771 front end resulting in errors at file scope, then call this version
4772 instead from front-end code. */
4775 c_variable_size (tree size)
4779 if (TREE_CONSTANT (size))
4782 size = save_expr (size);
4784 save = skip_simple_arithmetic (size);
4786 if (cfun && cfun->dont_save_pending_sizes_p)
4789 if (!global_bindings_p ())
4790 put_pending_size (save);
4795 /* Given declspecs and a declarator,
4796 determine the name and type of the object declared
4797 and construct a ..._DECL node for it.
4798 (In one case we can return a ..._TYPE node instead.
4799 For invalid input we sometimes return 0.)
4801 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4803 DECL_CONTEXT says which syntactic context this declaration is in:
4804 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4805 FUNCDEF for a function definition. Like NORMAL but a few different
4806 error messages in each case. Return value may be zero meaning
4807 this definition is too screwy to try to parse.
4808 PARM for a parameter declaration (either within a function prototype
4809 or before a function body). Make a PARM_DECL, or return void_type_node.
4810 TYPENAME if for a typename (in a cast or sizeof).
4811 Don't make a DECL node; just return the ..._TYPE node.
4812 FIELD for a struct or union field; make a FIELD_DECL.
4813 INITIALIZED is true if the decl has an initializer.
4814 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4815 representing the width of the bit-field.
4816 DECL_ATTRS points to the list of attributes that should be added to this
4817 decl. Any nested attributes that belong on the decl itself will be
4819 If EXPR is not NULL, any expressions that need to be evaluated as
4820 part of evaluating variably modified types will be stored in *EXPR.
4821 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4822 set to indicate whether operands in *EXPR can be used in constant
4824 DEPRECATED_STATE is a deprecated_states value indicating whether
4825 deprecation warnings should be suppressed.
4827 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4828 It may also be so in the PARM case, for a prototype where the
4829 argument type is specified but not the name.
4831 This function is where the complicated C meanings of `static'
4832 and `extern' are interpreted. */
4835 grokdeclarator (const struct c_declarator *declarator,
4836 struct c_declspecs *declspecs,
4837 enum decl_context decl_context, bool initialized, tree *width,
4838 tree *decl_attrs, tree *expr, bool *expr_const_operands,
4839 enum deprecated_states deprecated_state)
4841 tree type = declspecs->type;
4842 bool threadp = declspecs->thread_p;
4843 enum c_storage_class storage_class = declspecs->storage_class;
4847 int type_quals = TYPE_UNQUALIFIED;
4848 tree name = NULL_TREE;
4849 bool funcdef_flag = false;
4850 bool funcdef_syntax = false;
4851 bool size_varies = false;
4852 tree decl_attr = declspecs->decl_attr;
4853 int array_ptr_quals = TYPE_UNQUALIFIED;
4854 tree array_ptr_attrs = NULL_TREE;
4855 int array_parm_static = 0;
4856 bool array_parm_vla_unspec_p = false;
4857 tree returned_attrs = NULL_TREE;
4858 bool bitfield = width != NULL;
4860 struct c_arg_info *arg_info = 0;
4861 addr_space_t as1, as2, address_space;
4862 location_t loc = UNKNOWN_LOCATION;
4865 bool expr_const_operands_dummy;
4869 if (expr_const_operands == NULL)
4870 expr_const_operands = &expr_const_operands_dummy;
4872 *expr = declspecs->expr;
4873 *expr_const_operands = declspecs->expr_const_operands;
4875 if (decl_context == FUNCDEF)
4876 funcdef_flag = true, decl_context = NORMAL;
4878 /* Look inside a declarator for the name being declared
4879 and get it as an IDENTIFIER_NODE, for an error message. */
4881 const struct c_declarator *decl = declarator;
4892 funcdef_syntax = (decl->kind == cdk_function);
4893 decl = decl->declarator;
4897 decl = decl->declarator;
4912 gcc_assert (decl_context == PARM
4913 || decl_context == TYPENAME
4914 || (decl_context == FIELD
4915 && declarator->kind == cdk_id));
4916 gcc_assert (!initialized);
4920 /* A function definition's declarator must have the form of
4921 a function declarator. */
4923 if (funcdef_flag && !funcdef_syntax)
4926 /* If this looks like a function definition, make it one,
4927 even if it occurs where parms are expected.
4928 Then store_parm_decls will reject it and not use it as a parm. */
4929 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4930 decl_context = PARM;
4932 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4933 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
4935 if ((decl_context == NORMAL || decl_context == FIELD)
4936 && current_scope == file_scope
4937 && variably_modified_type_p (type, NULL_TREE))
4940 error_at (loc, "variably modified %qE at file scope", name);
4942 error_at (loc, "variably modified field at file scope");
4943 type = integer_type_node;
4946 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
4948 /* Diagnose defaulting to "int". */
4950 if (declspecs->default_int_p && !in_system_header)
4952 /* Issue a warning if this is an ISO C 99 program or if
4953 -Wreturn-type and this is a function, or if -Wimplicit;
4954 prefer the former warning since it is more explicit. */
4955 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4957 warn_about_return_type = 1;
4961 pedwarn_c99 (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int,
4962 "type defaults to %<int%> in declaration of %qE",
4965 pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int,
4966 "type defaults to %<int%> in type name");
4970 /* Adjust the type if a bit-field is being declared,
4971 -funsigned-bitfields applied and the type is not explicitly
4973 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4974 && TREE_CODE (type) == INTEGER_TYPE)
4975 type = unsigned_type_for (type);
4977 /* Figure out the type qualifiers for the declaration. There are
4978 two ways a declaration can become qualified. One is something
4979 like `const int i' where the `const' is explicit. Another is
4980 something like `typedef const int CI; CI i' where the type of the
4981 declaration contains the `const'. A third possibility is that
4982 there is a type qualifier on the element type of a typedefed
4983 array type, in which case we should extract that qualifier so
4984 that c_apply_type_quals_to_decl receives the full list of
4985 qualifiers to work with (C90 is not entirely clear about whether
4986 duplicate qualifiers should be diagnosed in this case, but it
4987 seems most appropriate to do so). */
4988 element_type = strip_array_types (type);
4989 constp = declspecs->const_p + TYPE_READONLY (element_type);
4990 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4991 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4992 as1 = declspecs->address_space;
4993 as2 = TYPE_ADDR_SPACE (element_type);
4994 address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1;
4996 if (pedantic && !flag_isoc99)
4999 pedwarn (loc, OPT_pedantic, "duplicate %<const%>");
5001 pedwarn (loc, OPT_pedantic, "duplicate %<restrict%>");
5003 pedwarn (loc, OPT_pedantic, "duplicate %<volatile%>");
5006 if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2)
5007 error_at (loc, "conflicting named address spaces (%s vs %s)",
5008 c_addr_space_name (as1), c_addr_space_name (as2));
5010 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
5011 type = TYPE_MAIN_VARIANT (type);
5012 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
5013 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
5014 | (volatilep ? TYPE_QUAL_VOLATILE : 0)
5015 | ENCODE_QUAL_ADDR_SPACE (address_space));
5017 /* Warn about storage classes that are invalid for certain
5018 kinds of declarations (parameters, typenames, etc.). */
5022 || storage_class == csc_auto
5023 || storage_class == csc_register
5024 || storage_class == csc_typedef))
5026 if (storage_class == csc_auto)
5028 (current_scope == file_scope) ? 0 : OPT_pedantic,
5029 "function definition declared %<auto%>");
5030 if (storage_class == csc_register)
5031 error_at (loc, "function definition declared %<register%>");
5032 if (storage_class == csc_typedef)
5033 error_at (loc, "function definition declared %<typedef%>");
5035 error_at (loc, "function definition declared %<__thread%>");
5037 if (storage_class == csc_auto
5038 || storage_class == csc_register
5039 || storage_class == csc_typedef)
5040 storage_class = csc_none;
5042 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
5044 if (decl_context == PARM && storage_class == csc_register)
5048 switch (decl_context)
5052 error_at (loc, "storage class specified for structure "
5055 error_at (loc, "storage class specified for structure field");
5059 error_at (loc, "storage class specified for parameter %qE",
5062 error_at (loc, "storage class specified for unnamed parameter");
5065 error_at (loc, "storage class specified for typename");
5068 storage_class = csc_none;
5072 else if (storage_class == csc_extern
5076 /* 'extern' with initialization is invalid if not at file scope. */
5077 if (current_scope == file_scope)
5079 /* It is fine to have 'extern const' when compiling at C
5080 and C++ intersection. */
5081 if (!(warn_cxx_compat && constp))
5082 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
5086 error_at (loc, "%qE has both %<extern%> and initializer", name);
5088 else if (current_scope == file_scope)
5090 if (storage_class == csc_auto)
5091 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
5093 if (pedantic && storage_class == csc_register)
5094 pedwarn (input_location, OPT_pedantic,
5095 "file-scope declaration of %qE specifies %<register%>", name);
5099 if (storage_class == csc_extern && funcdef_flag)
5100 error_at (loc, "nested function %qE declared %<extern%>", name);
5101 else if (threadp && storage_class == csc_none)
5103 error_at (loc, "function-scope %qE implicitly auto and declared "
5110 /* Now figure out the structure of the declarator proper.
5111 Descend through it, creating more complex types, until we reach
5112 the declared identifier (or NULL_TREE, in an absolute declarator).
5113 At each stage we maintain an unqualified version of the type
5114 together with any qualifiers that should be applied to it with
5115 c_build_qualified_type; this way, array types including
5116 multidimensional array types are first built up in unqualified
5117 form and then the qualified form is created with
5118 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5120 while (declarator && declarator->kind != cdk_id)
5122 if (type == error_mark_node)
5124 declarator = declarator->declarator;
5128 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5129 a cdk_pointer (for *...),
5130 a cdk_function (for ...(...)),
5131 a cdk_attrs (for nested attributes),
5132 or a cdk_id (for the name being declared
5133 or the place in an absolute declarator
5134 where the name was omitted).
5135 For the last case, we have just exited the loop.
5137 At this point, TYPE is the type of elements of an array,
5138 or for a function to return, or for a pointer to point to.
5139 After this sequence of ifs, TYPE is the type of the
5140 array or function or pointer, and DECLARATOR has had its
5141 outermost layer removed. */
5143 if (array_ptr_quals != TYPE_UNQUALIFIED
5144 || array_ptr_attrs != NULL_TREE
5145 || array_parm_static)
5147 /* Only the innermost declarator (making a parameter be of
5148 array type which is converted to pointer type)
5149 may have static or type qualifiers. */
5150 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5151 array_ptr_quals = TYPE_UNQUALIFIED;
5152 array_ptr_attrs = NULL_TREE;
5153 array_parm_static = 0;
5156 switch (declarator->kind)
5160 /* A declarator with embedded attributes. */
5161 tree attrs = declarator->u.attrs;
5162 const struct c_declarator *inner_decl;
5164 declarator = declarator->declarator;
5165 inner_decl = declarator;
5166 while (inner_decl->kind == cdk_attrs)
5167 inner_decl = inner_decl->declarator;
5168 if (inner_decl->kind == cdk_id)
5169 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
5170 else if (inner_decl->kind == cdk_function)
5171 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
5172 else if (inner_decl->kind == cdk_array)
5173 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
5174 returned_attrs = decl_attributes (&type,
5175 chainon (returned_attrs, attrs),
5181 tree itype = NULL_TREE;
5182 tree size = declarator->u.array.dimen;
5183 /* The index is a signed object `sizetype' bits wide. */
5184 tree index_type = c_common_signed_type (sizetype);
5186 array_ptr_quals = declarator->u.array.quals;
5187 array_ptr_attrs = declarator->u.array.attrs;
5188 array_parm_static = declarator->u.array.static_p;
5189 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
5191 declarator = declarator->declarator;
5193 /* Check for some types that there cannot be arrays of. */
5195 if (VOID_TYPE_P (type))
5198 error_at (loc, "declaration of %qE as array of voids", name);
5200 error_at (loc, "declaration of type name as array of voids");
5201 type = error_mark_node;
5204 if (TREE_CODE (type) == FUNCTION_TYPE)
5207 error_at (loc, "declaration of %qE as array of functions",
5210 error_at (loc, "declaration of type name as array of "
5212 type = error_mark_node;
5215 if (pedantic && !in_system_header && flexible_array_type_p (type))
5216 pedwarn (loc, OPT_pedantic,
5217 "invalid use of structure with flexible array member");
5219 if (size == error_mark_node)
5220 type = error_mark_node;
5222 if (type == error_mark_node)
5225 /* If size was specified, set ITYPE to a range-type for
5226 that size. Otherwise, ITYPE remains null. finish_decl
5227 may figure it out from an initial value. */
5231 bool size_maybe_const = true;
5232 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
5233 && !TREE_OVERFLOW (size));
5234 bool this_size_varies = false;
5236 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5238 STRIP_TYPE_NOPS (size);
5240 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
5243 error_at (loc, "size of array %qE has non-integer type",
5247 "size of unnamed array has non-integer type");
5248 size = integer_one_node;
5251 size = c_fully_fold (size, false, &size_maybe_const);
5253 if (pedantic && size_maybe_const && integer_zerop (size))
5256 pedwarn (loc, OPT_pedantic,
5257 "ISO C forbids zero-size array %qE", name);
5259 pedwarn (loc, OPT_pedantic,
5260 "ISO C forbids zero-size array");
5263 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
5265 constant_expression_warning (size);
5266 if (tree_int_cst_sgn (size) < 0)
5269 error_at (loc, "size of array %qE is negative", name);
5271 error_at (loc, "size of unnamed array is negative");
5272 size = integer_one_node;
5274 /* Handle a size folded to an integer constant but
5275 not an integer constant expression. */
5276 if (!size_int_const)
5278 /* If this is a file scope declaration of an
5279 ordinary identifier, this is invalid code;
5280 diagnosing it here and not subsequently
5281 treating the type as variable-length avoids
5282 more confusing diagnostics later. */
5283 if ((decl_context == NORMAL || decl_context == FIELD)
5284 && current_scope == file_scope)
5285 pedwarn (input_location, 0,
5286 "variably modified %qE at file scope",
5289 this_size_varies = size_varies = true;
5290 warn_variable_length_array (name, size);
5293 else if ((decl_context == NORMAL || decl_context == FIELD)
5294 && current_scope == file_scope)
5296 error_at (loc, "variably modified %qE at file scope", name);
5297 size = integer_one_node;
5301 /* Make sure the array size remains visibly
5302 nonconstant even if it is (eg) a const variable
5303 with known value. */
5304 this_size_varies = size_varies = true;
5305 warn_variable_length_array (name, size);
5308 if (integer_zerop (size) && !this_size_varies)
5310 /* A zero-length array cannot be represented with
5311 an unsigned index type, which is what we'll
5312 get with build_index_type. Create an
5313 open-ended range instead. */
5314 itype = build_range_type (sizetype, size, NULL_TREE);
5318 /* Arrange for the SAVE_EXPR on the inside of the
5319 MINUS_EXPR, which allows the -1 to get folded
5320 with the +1 that happens when building TYPE_SIZE. */
5322 size = c_variable_size (size);
5323 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
5324 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5325 integer_zero_node, size);
5327 /* Compute the maximum valid index, that is, size
5328 - 1. Do the calculation in index_type, so that
5329 if it is a variable the computations will be
5330 done in the proper mode. */
5331 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
5332 convert (index_type, size),
5333 convert (index_type,
5336 /* If that overflowed, the array is too big. ???
5337 While a size of INT_MAX+1 technically shouldn't
5338 cause an overflow (because we subtract 1), the
5339 overflow is recorded during the conversion to
5340 index_type, before the subtraction. Handling
5341 this case seems like an unnecessary
5343 if (TREE_CODE (itype) == INTEGER_CST
5344 && TREE_OVERFLOW (itype))
5347 error_at (loc, "size of array %qE is too large",
5350 error_at (loc, "size of unnamed array is too large");
5351 type = error_mark_node;
5355 itype = build_index_type (itype);
5357 if (this_size_varies)
5360 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5364 *expr_const_operands &= size_maybe_const;
5367 else if (decl_context == FIELD)
5369 bool flexible_array_member = false;
5370 if (array_parm_vla_unspec_p)
5371 /* Field names can in fact have function prototype
5372 scope so [*] is disallowed here through making
5373 the field variably modified, not through being
5374 something other than a declaration with function
5379 const struct c_declarator *t = declarator;
5380 while (t->kind == cdk_attrs)
5382 flexible_array_member = (t->kind == cdk_id);
5384 if (flexible_array_member
5385 && pedantic && !flag_isoc99 && !in_system_header)
5386 pedwarn (loc, OPT_pedantic,
5387 "ISO C90 does not support flexible array members");
5389 /* ISO C99 Flexible array members are effectively
5390 identical to GCC's zero-length array extension. */
5391 if (flexible_array_member || array_parm_vla_unspec_p)
5392 itype = build_range_type (sizetype, size_zero_node,
5395 else if (decl_context == PARM)
5397 if (array_parm_vla_unspec_p)
5399 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
5403 else if (decl_context == TYPENAME)
5405 if (array_parm_vla_unspec_p)
5408 warning (0, "%<[*]%> not in a declaration");
5409 /* We use this to avoid messing up with incomplete
5410 array types of the same type, that would
5411 otherwise be modified below. */
5412 itype = build_range_type (sizetype, size_zero_node,
5418 /* Complain about arrays of incomplete types. */
5419 if (!COMPLETE_TYPE_P (type))
5421 error_at (loc, "array type has incomplete element type");
5422 type = error_mark_node;
5425 /* When itype is NULL, a shared incomplete array type is
5426 returned for all array of a given type. Elsewhere we
5427 make sure we don't complete that type before copying
5428 it, but here we want to make sure we don't ever
5429 modify the shared type, so we gcc_assert (itype)
5432 addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals);
5433 if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type))
5434 type = build_qualified_type (type,
5435 ENCODE_QUAL_ADDR_SPACE (as));
5437 type = build_array_type (type, itype);
5440 if (type != error_mark_node)
5444 /* It is ok to modify type here even if itype is
5445 NULL: if size_varies, we're in a
5446 multi-dimensional array and the inner type has
5447 variable size, so the enclosing shared array type
5449 if (size && TREE_CODE (size) == INTEGER_CST)
5451 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5452 C_TYPE_VARIABLE_SIZE (type) = 1;
5455 /* The GCC extension for zero-length arrays differs from
5456 ISO flexible array members in that sizeof yields
5458 if (size && integer_zerop (size))
5461 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5462 TYPE_SIZE (type) = bitsize_zero_node;
5463 TYPE_SIZE_UNIT (type) = size_zero_node;
5464 SET_TYPE_STRUCTURAL_EQUALITY (type);
5466 if (array_parm_vla_unspec_p)
5469 /* The type is complete. C99 6.7.5.2p4 */
5470 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5471 TYPE_SIZE (type) = bitsize_zero_node;
5472 TYPE_SIZE_UNIT (type) = size_zero_node;
5473 SET_TYPE_STRUCTURAL_EQUALITY (type);
5477 if (decl_context != PARM
5478 && (array_ptr_quals != TYPE_UNQUALIFIED
5479 || array_ptr_attrs != NULL_TREE
5480 || array_parm_static))
5482 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5483 array_ptr_quals = TYPE_UNQUALIFIED;
5484 array_ptr_attrs = NULL_TREE;
5485 array_parm_static = 0;
5491 /* Say it's a definition only for the declarator closest
5492 to the identifier, apart possibly from some
5494 bool really_funcdef = false;
5498 const struct c_declarator *t = declarator->declarator;
5499 while (t->kind == cdk_attrs)
5501 really_funcdef = (t->kind == cdk_id);
5504 /* Declaring a function type. Make sure we have a valid
5505 type for the function to return. */
5506 if (type == error_mark_node)
5509 size_varies = false;
5511 /* Warn about some types functions can't return. */
5512 if (TREE_CODE (type) == FUNCTION_TYPE)
5515 error_at (loc, "%qE declared as function returning a "
5518 error_at (loc, "type name declared as function "
5519 "returning a function");
5520 type = integer_type_node;
5522 if (TREE_CODE (type) == ARRAY_TYPE)
5525 error_at (loc, "%qE declared as function returning an array",
5528 error_at (loc, "type name declared as function returning "
5530 type = integer_type_node;
5532 errmsg = targetm.invalid_return_type (type);
5536 type = integer_type_node;
5539 /* Construct the function type and go to the next
5540 inner layer of declarator. */
5541 arg_info = declarator->u.arg_info;
5542 arg_types = grokparms (arg_info, really_funcdef);
5544 put_pending_sizes (arg_info->pending_sizes);
5546 /* Type qualifiers before the return type of the function
5547 qualify the return type, not the function type. */
5550 /* Type qualifiers on a function return type are
5551 normally permitted by the standard but have no
5552 effect, so give a warning at -Wreturn-type.
5553 Qualifiers on a void return type are banned on
5554 function definitions in ISO C; GCC used to used
5555 them for noreturn functions. */
5556 if (VOID_TYPE_P (type) && really_funcdef)
5558 "function definition has qualified void return type");
5560 warning_at (loc, OPT_Wignored_qualifiers,
5561 "type qualifiers ignored on function return type");
5563 type = c_build_qualified_type (type, type_quals);
5565 type_quals = TYPE_UNQUALIFIED;
5567 type = build_function_type (type, arg_types);
5568 declarator = declarator->declarator;
5570 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5571 the formal parameter list of this FUNCTION_TYPE to point to
5572 the FUNCTION_TYPE node itself. */
5577 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag, arg_info->tags, ix, tag)
5578 TYPE_CONTEXT (tag->type) = type;
5584 /* Merge any constancy or volatility into the target type
5587 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5589 pedwarn (loc, OPT_pedantic,
5590 "ISO C forbids qualified function types");
5592 type = c_build_qualified_type (type, type_quals);
5593 size_varies = false;
5595 /* When the pointed-to type involves components of variable size,
5596 care must be taken to ensure that the size evaluation code is
5597 emitted early enough to dominate all the possible later uses
5598 and late enough for the variables on which it depends to have
5601 This is expected to happen automatically when the pointed-to
5602 type has a name/declaration of it's own, but special attention
5603 is required if the type is anonymous.
5605 We handle the NORMAL and FIELD contexts here by attaching an
5606 artificial TYPE_DECL to such pointed-to type. This forces the
5607 sizes evaluation at a safe point and ensures it is not deferred
5608 until e.g. within a deeper conditional context.
5610 We expect nothing to be needed here for PARM or TYPENAME.
5611 Pushing a TYPE_DECL at this point for TYPENAME would actually
5612 be incorrect, as we might be in the middle of an expression
5613 with side effects on the pointed-to type size "arguments" prior
5614 to the pointer declaration point and the fake TYPE_DECL in the
5615 enclosing context would force the size evaluation prior to the
5618 if (!TYPE_NAME (type)
5619 && (decl_context == NORMAL || decl_context == FIELD)
5620 && variably_modified_type_p (type, NULL_TREE))
5622 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
5623 DECL_ARTIFICIAL (decl) = 1;
5625 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
5626 TYPE_NAME (type) = decl;
5629 type = build_pointer_type (type);
5631 /* Process type qualifiers (such as const or volatile)
5632 that were given inside the `*'. */
5633 type_quals = declarator->u.pointer_quals;
5635 declarator = declarator->declarator;
5642 *decl_attrs = chainon (returned_attrs, *decl_attrs);
5644 /* Now TYPE has the actual type, apart from any qualifiers in
5647 /* Warn about address space used for things other than static memory or
5649 address_space = DECODE_QUAL_ADDR_SPACE (type_quals);
5650 if (!ADDR_SPACE_GENERIC_P (address_space))
5652 if (decl_context == NORMAL)
5654 switch (storage_class)
5657 error ("%qs combined with %<auto%> qualifier for %qE",
5658 c_addr_space_name (address_space), name);
5661 error ("%qs combined with %<register%> qualifier for %qE",
5662 c_addr_space_name (address_space), name);
5665 if (current_function_scope)
5667 error ("%qs specified for auto variable %qE",
5668 c_addr_space_name (address_space), name);
5680 else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE)
5683 error ("%qs specified for parameter %qE",
5684 c_addr_space_name (address_space), name);
5686 error ("%qs specified for unnamed parameter",
5687 c_addr_space_name (address_space));
5689 else if (decl_context == FIELD)
5692 error ("%qs specified for structure field %qE",
5693 c_addr_space_name (address_space), name);
5695 error ("%qs specified for structure field",
5696 c_addr_space_name (address_space));
5700 /* Check the type and width of a bit-field. */
5702 check_bitfield_type_and_width (&type, width, name);
5704 /* Did array size calculations overflow? */
5706 if (TREE_CODE (type) == ARRAY_TYPE
5707 && COMPLETE_TYPE_P (type)
5708 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
5709 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
5712 error_at (loc, "size of array %qE is too large", name);
5714 error_at (loc, "size of unnamed array is too large");
5715 /* If we proceed with the array type as it is, we'll eventually
5716 crash in tree_low_cst(). */
5717 type = error_mark_node;
5720 /* If this is declaring a typedef name, return a TYPE_DECL. */
5722 if (storage_class == csc_typedef)
5725 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5727 pedwarn (loc, OPT_pedantic,
5728 "ISO C forbids qualified function types");
5730 type = c_build_qualified_type (type, type_quals);
5731 decl = build_decl (declarator->id_loc,
5732 TYPE_DECL, declarator->u.id, type);
5733 if (declspecs->explicit_signed_p)
5734 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5735 if (declspecs->inline_p)
5736 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
5738 if (warn_cxx_compat && declarator->u.id != NULL_TREE)
5740 struct c_binding *b = I_TAG_BINDING (declarator->u.id);
5743 && b->decl != NULL_TREE
5744 && (B_IN_CURRENT_SCOPE (b)
5745 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
5746 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
5748 warning_at (declarator->id_loc, OPT_Wc___compat,
5749 ("using %qD as both a typedef and a tag is "
5752 if (b->locus != UNKNOWN_LOCATION)
5753 inform (b->locus, "originally defined here");
5760 /* If this is a type name (such as, in a cast or sizeof),
5761 compute the type and return it now. */
5763 if (decl_context == TYPENAME)
5765 /* Note that the grammar rejects storage classes in typenames
5767 gcc_assert (storage_class == csc_none && !threadp
5768 && !declspecs->inline_p);
5769 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5771 pedwarn (loc, OPT_pedantic,
5772 "ISO C forbids const or volatile function types");
5774 type = c_build_qualified_type (type, type_quals);
5778 if (pedantic && decl_context == FIELD
5779 && variably_modified_type_p (type, NULL_TREE))
5782 pedwarn (loc, OPT_pedantic, "a member of a structure or union cannot "
5783 "have a variably modified type");
5786 /* Aside from typedefs and type names (handle above),
5787 `void' at top level (not within pointer)
5788 is allowed only in public variables.
5789 We don't complain about parms either, but that is because
5790 a better error message can be made later. */
5792 if (VOID_TYPE_P (type) && decl_context != PARM
5793 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5794 && (storage_class == csc_extern
5795 || (current_scope == file_scope
5796 && !(storage_class == csc_static
5797 || storage_class == csc_register)))))
5799 error_at (loc, "variable or field %qE declared void", name);
5800 type = integer_type_node;
5803 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5804 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5809 if (decl_context == PARM)
5813 /* A parameter declared as an array of T is really a pointer to T.
5814 One declared as a function is really a pointer to a function. */
5816 if (TREE_CODE (type) == ARRAY_TYPE)
5818 /* Transfer const-ness of array into that of type pointed to. */
5819 type = TREE_TYPE (type);
5821 type = c_build_qualified_type (type, type_quals);
5822 type = build_pointer_type (type);
5823 type_quals = array_ptr_quals;
5825 type = c_build_qualified_type (type, type_quals);
5827 /* We don't yet implement attributes in this context. */
5828 if (array_ptr_attrs != NULL_TREE)
5829 warning_at (loc, OPT_Wattributes,
5830 "attributes in parameter array declarator ignored");
5832 size_varies = false;
5834 else if (TREE_CODE (type) == FUNCTION_TYPE)
5837 pedwarn (loc, OPT_pedantic,
5838 "ISO C forbids qualified function types");
5840 type = c_build_qualified_type (type, type_quals);
5841 type = build_pointer_type (type);
5842 type_quals = TYPE_UNQUALIFIED;
5844 else if (type_quals)
5845 type = c_build_qualified_type (type, type_quals);
5847 decl = build_decl (declarator->id_loc,
5848 PARM_DECL, declarator->u.id, type);
5850 C_DECL_VARIABLE_SIZE (decl) = 1;
5852 /* Compute the type actually passed in the parmlist,
5853 for the case where there is no prototype.
5854 (For example, shorts and chars are passed as ints.)
5855 When there is a prototype, this is overridden later. */
5857 if (type == error_mark_node)
5858 promoted_type = type;
5860 promoted_type = c_type_promotes_to (type);
5862 DECL_ARG_TYPE (decl) = promoted_type;
5863 if (declspecs->inline_p)
5864 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
5866 else if (decl_context == FIELD)
5868 /* Note that the grammar rejects storage classes in typenames
5870 gcc_assert (storage_class == csc_none && !threadp
5871 && !declspecs->inline_p);
5873 /* Structure field. It may not be a function. */
5875 if (TREE_CODE (type) == FUNCTION_TYPE)
5877 error_at (loc, "field %qE declared as a function", name);
5878 type = build_pointer_type (type);
5880 else if (TREE_CODE (type) != ERROR_MARK
5881 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
5884 error_at (loc, "field %qE has incomplete type", name);
5886 error_at (loc, "unnamed field has incomplete type");
5887 type = error_mark_node;
5889 type = c_build_qualified_type (type, type_quals);
5890 decl = build_decl (declarator->id_loc,
5891 FIELD_DECL, declarator->u.id, type);
5892 DECL_NONADDRESSABLE_P (decl) = bitfield;
5893 if (bitfield && !declarator->u.id)
5894 TREE_NO_WARNING (decl) = 1;
5897 C_DECL_VARIABLE_SIZE (decl) = 1;
5899 else if (TREE_CODE (type) == FUNCTION_TYPE)
5901 if (storage_class == csc_register || threadp)
5903 error_at (loc, "invalid storage class for function %qE", name);
5905 else if (current_scope != file_scope)
5907 /* Function declaration not at file scope. Storage
5908 classes other than `extern' are not allowed, C99
5909 6.7.1p5, and `extern' makes no difference. However,
5910 GCC allows 'auto', perhaps with 'inline', to support
5911 nested functions. */
5912 if (storage_class == csc_auto)
5913 pedwarn (loc, OPT_pedantic,
5914 "invalid storage class for function %qE", name);
5915 else if (storage_class == csc_static)
5917 error_at (loc, "invalid storage class for function %qE", name);
5919 storage_class = declspecs->storage_class = csc_none;
5925 decl = build_decl (declarator->id_loc,
5926 FUNCTION_DECL, declarator->u.id, type);
5927 decl = build_decl_attribute_variant (decl, decl_attr);
5929 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
5930 pedwarn (loc, OPT_pedantic,
5931 "ISO C forbids qualified function types");
5933 /* Every function declaration is an external reference
5934 (DECL_EXTERNAL) except for those which are not at file
5935 scope and are explicitly declared "auto". This is
5936 forbidden by standard C (C99 6.7.1p5) and is interpreted by
5937 GCC to signify a forward declaration of a nested function. */
5938 if (storage_class == csc_auto && current_scope != file_scope)
5939 DECL_EXTERNAL (decl) = 0;
5940 /* In C99, a function which is declared 'inline' with 'extern'
5941 is not an external reference (which is confusing). It
5942 means that the later definition of the function must be output
5943 in this file, C99 6.7.4p6. In GNU C89, a function declared
5944 'extern inline' is an external reference. */
5945 else if (declspecs->inline_p && storage_class != csc_static)
5946 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
5947 == flag_gnu89_inline);
5949 DECL_EXTERNAL (decl) = !initialized;
5951 /* Record absence of global scope for `static' or `auto'. */
5953 = !(storage_class == csc_static || storage_class == csc_auto);
5955 /* For a function definition, record the argument information
5956 block where store_parm_decls will look for it. */
5958 current_function_arg_info = arg_info;
5960 if (declspecs->default_int_p)
5961 C_FUNCTION_IMPLICIT_INT (decl) = 1;
5963 /* Record presence of `inline', if it is reasonable. */
5964 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
5966 if (declspecs->inline_p)
5967 pedwarn (loc, 0, "cannot inline function %<main%>");
5969 else if (declspecs->inline_p)
5970 /* Record that the function is declared `inline'. */
5971 DECL_DECLARED_INLINE_P (decl) = 1;
5975 /* It's a variable. */
5976 /* An uninitialized decl with `extern' is a reference. */
5977 int extern_ref = !initialized && storage_class == csc_extern;
5979 type = c_build_qualified_type (type, type_quals);
5981 /* C99 6.2.2p7: It is invalid (compile-time undefined
5982 behavior) to create an 'extern' declaration for a
5983 variable if there is a global declaration that is
5984 'static' and the global declaration is not visible.
5985 (If the static declaration _is_ currently visible,
5986 the 'extern' declaration is taken to refer to that decl.) */
5987 if (extern_ref && current_scope != file_scope)
5989 tree global_decl = identifier_global_value (declarator->u.id);
5990 tree visible_decl = lookup_name (declarator->u.id);
5993 && global_decl != visible_decl
5994 && TREE_CODE (global_decl) == VAR_DECL
5995 && !TREE_PUBLIC (global_decl))
5996 error_at (loc, "variable previously declared %<static%> "
5997 "redeclared %<extern%>");
6000 decl = build_decl (declarator->id_loc,
6001 VAR_DECL, declarator->u.id, type);
6003 C_DECL_VARIABLE_SIZE (decl) = 1;
6005 if (declspecs->inline_p)
6006 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
6008 /* At file scope, an initialized extern declaration may follow
6009 a static declaration. In that case, DECL_EXTERNAL will be
6010 reset later in start_decl. */
6011 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
6013 /* At file scope, the presence of a `static' or `register' storage
6014 class specifier, or the absence of all storage class specifiers
6015 makes this declaration a definition (perhaps tentative). Also,
6016 the absence of `static' makes it public. */
6017 if (current_scope == file_scope)
6019 TREE_PUBLIC (decl) = storage_class != csc_static;
6020 TREE_STATIC (decl) = !extern_ref;
6022 /* Not at file scope, only `static' makes a static definition. */
6025 TREE_STATIC (decl) = (storage_class == csc_static);
6026 TREE_PUBLIC (decl) = extern_ref;
6030 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6033 if ((storage_class == csc_extern
6034 || (storage_class == csc_none
6035 && TREE_CODE (type) == FUNCTION_TYPE
6037 && variably_modified_type_p (type, NULL_TREE))
6040 if (TREE_CODE (type) == FUNCTION_TYPE)
6041 error_at (loc, "non-nested function with variably modified type");
6043 error_at (loc, "object with variably modified type must have "
6047 /* Record `register' declaration for warnings on &
6048 and in case doing stupid register allocation. */
6050 if (storage_class == csc_register)
6052 C_DECL_REGISTER (decl) = 1;
6053 DECL_REGISTER (decl) = 1;
6056 /* Record constancy and volatility. */
6057 c_apply_type_quals_to_decl (type_quals, decl);
6059 /* If a type has volatile components, it should be stored in memory.
6060 Otherwise, the fact that those components are volatile
6061 will be ignored, and would even crash the compiler.
6062 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6063 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
6064 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
6065 || TREE_CODE (decl) == RESULT_DECL))
6067 /* It is not an error for a structure with volatile fields to
6068 be declared register, but reset DECL_REGISTER since it
6069 cannot actually go in a register. */
6070 int was_reg = C_DECL_REGISTER (decl);
6071 C_DECL_REGISTER (decl) = 0;
6072 DECL_REGISTER (decl) = 0;
6073 c_mark_addressable (decl);
6074 C_DECL_REGISTER (decl) = was_reg;
6077 /* This is the earliest point at which we might know the assembler
6078 name of a variable. Thus, if it's known before this, die horribly. */
6079 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
6082 && TREE_CODE (decl) == VAR_DECL
6083 && TREE_PUBLIC (decl)
6084 && TREE_STATIC (decl)
6085 && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
6086 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
6087 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
6088 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
6089 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
6090 ("non-local variable %qD with anonymous type is "
6091 "questionable in C++"),
6098 /* Decode the parameter-list info for a function type or function definition.
6099 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6100 if there is an identifier list instead of a parameter decl list).
6101 These two functions are separate because when a function returns
6102 or receives functions then each is called multiple times but the order
6103 of calls is different. The last call to `grokparms' is always the one
6104 that contains the formal parameter names of a function definition.
6106 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6108 FUNCDEF_FLAG is true for a function definition, false for
6109 a mere declaration. A nonempty identifier-list gets an error message
6110 when FUNCDEF_FLAG is false. */
6113 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
6115 tree arg_types = arg_info->types;
6117 if (funcdef_flag && arg_info->had_vla_unspec)
6119 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6121 error ("%<[*]%> not allowed in other than function prototype scope");
6124 if (arg_types == 0 && !funcdef_flag && !in_system_header)
6125 warning (OPT_Wstrict_prototypes,
6126 "function declaration isn%'t a prototype");
6128 if (arg_types == error_mark_node)
6129 return 0; /* don't set TYPE_ARG_TYPES in this case */
6131 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
6135 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
6136 arg_info->parms = NULL_TREE;
6139 arg_info->parms = arg_info->types;
6141 arg_info->types = 0;
6146 tree parm, type, typelt;
6147 unsigned int parmno;
6150 /* If there is a parameter of incomplete type in a definition,
6151 this is an error. In a declaration this is valid, and a
6152 struct or union type may be completed later, before any calls
6153 or definition of the function. In the case where the tag was
6154 first declared within the parameter list, a warning has
6155 already been given. If a parameter has void type, then
6156 however the function cannot be defined or called, so
6159 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
6161 parm = DECL_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
6163 type = TREE_VALUE (typelt);
6164 if (type == error_mark_node)
6167 if (!COMPLETE_TYPE_P (type))
6171 if (DECL_NAME (parm))
6172 error_at (input_location,
6173 "parameter %u (%q+D) has incomplete type",
6176 error_at (DECL_SOURCE_LOCATION (parm),
6177 "parameter %u has incomplete type",
6180 TREE_VALUE (typelt) = error_mark_node;
6181 TREE_TYPE (parm) = error_mark_node;
6182 arg_types = NULL_TREE;
6184 else if (VOID_TYPE_P (type))
6186 if (DECL_NAME (parm))
6187 warning_at (input_location, 0,
6188 "parameter %u (%q+D) has void type",
6191 warning_at (DECL_SOURCE_LOCATION (parm), 0,
6192 "parameter %u has void type",
6197 errmsg = targetm.invalid_parameter_type (type);
6201 TREE_VALUE (typelt) = error_mark_node;
6202 TREE_TYPE (parm) = error_mark_node;
6203 arg_types = NULL_TREE;
6206 if (DECL_NAME (parm) && TREE_USED (parm))
6207 warn_if_shadowing (parm);
6213 /* Allocate and initialize a c_arg_info structure from the parser's
6217 build_arg_info (void)
6219 struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info);
6220 ret->parms = NULL_TREE;
6222 ret->types = NULL_TREE;
6223 ret->others = NULL_TREE;
6224 ret->pending_sizes = NULL;
6225 ret->had_vla_unspec = 0;
6229 /* Take apart the current scope and return a c_arg_info structure with
6230 info on a parameter list just parsed.
6232 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6234 ELLIPSIS being true means the argument list ended in '...' so don't
6235 append a sentinel (void_list_node) to the end of the type-list. */
6238 get_parm_info (bool ellipsis)
6240 struct c_binding *b = current_scope->bindings;
6241 struct c_arg_info *arg_info = build_arg_info ();
6244 VEC(c_arg_tag,gc) *tags = NULL;
6248 static bool explained_incomplete_types = false;
6249 bool gave_void_only_once_err = false;
6251 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
6253 /* The bindings in this scope must not get put into a block.
6254 We will take care of deleting the binding nodes. */
6255 current_scope->bindings = 0;
6257 /* This function is only called if there was *something* on the
6261 /* A parameter list consisting solely of 'void' indicates that the
6262 function takes no arguments. But if the 'void' is qualified
6263 (by 'const' or 'volatile'), or has a storage class specifier
6264 ('register'), then the behavior is undefined; issue an error.
6265 Typedefs for 'void' are OK (see DR#157). */
6266 if (b->prev == 0 /* one binding */
6267 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
6268 && !DECL_NAME (b->decl) /* anonymous */
6269 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
6271 if (TREE_THIS_VOLATILE (b->decl)
6272 || TREE_READONLY (b->decl)
6273 || C_DECL_REGISTER (b->decl))
6274 error ("%<void%> as only parameter may not be qualified");
6276 /* There cannot be an ellipsis. */
6278 error ("%<void%> must be the only parameter");
6280 arg_info->types = void_list_node;
6285 types = void_list_node;
6287 /* Break up the bindings list into parms, tags, types, and others;
6288 apply sanity checks; purge the name-to-decl bindings. */
6291 tree decl = b->decl;
6292 tree type = TREE_TYPE (decl);
6294 const char *keyword;
6296 switch (TREE_CODE (decl))
6301 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6302 I_SYMBOL_BINDING (b->id) = b->shadowed;
6305 /* Check for forward decls that never got their actual decl. */
6306 if (TREE_ASM_WRITTEN (decl))
6307 error ("parameter %q+D has just a forward declaration", decl);
6308 /* Check for (..., void, ...) and issue an error. */
6309 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
6311 if (!gave_void_only_once_err)
6313 error ("%<void%> must be the only parameter");
6314 gave_void_only_once_err = true;
6319 /* Valid parameter, add it to the list. */
6320 DECL_CHAIN (decl) = parms;
6323 /* Since there is a prototype, args are passed in their
6324 declared types. The back end may override this later. */
6325 DECL_ARG_TYPE (decl) = type;
6326 types = tree_cons (0, type, types);
6330 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
6331 case UNION_TYPE: keyword = "union"; goto tag;
6332 case RECORD_TYPE: keyword = "struct"; goto tag;
6334 /* Types may not have tag-names, in which case the type
6335 appears in the bindings list with b->id NULL. */
6338 gcc_assert (I_TAG_BINDING (b->id) == b);
6339 I_TAG_BINDING (b->id) = b->shadowed;
6342 /* Warn about any struct, union or enum tags defined in a
6343 parameter list. The scope of such types is limited to
6344 the parameter list, which is rarely if ever desirable
6345 (it's impossible to call such a function with type-
6346 correct arguments). An anonymous union parm type is
6347 meaningful as a GNU extension, so don't warn for that. */
6348 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
6351 /* The %s will be one of 'struct', 'union', or 'enum'. */
6352 warning (0, "%<%s %E%> declared inside parameter list",
6355 /* The %s will be one of 'struct', 'union', or 'enum'. */
6356 warning (0, "anonymous %s declared inside parameter list",
6359 if (!explained_incomplete_types)
6361 warning (0, "its scope is only this definition or declaration,"
6362 " which is probably not what you want");
6363 explained_incomplete_types = true;
6367 tag = VEC_safe_push (c_arg_tag, gc, tags, NULL);
6375 /* CONST_DECLs appear here when we have an embedded enum,
6376 and TYPE_DECLs appear here when we have an embedded struct
6377 or union. No warnings for this - we already warned about the
6378 type itself. FUNCTION_DECLs appear when there is an implicit
6379 function declaration in the parameter list. */
6381 /* When we reinsert this decl in the function body, we need
6382 to reconstruct whether it was marked as nested. */
6383 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6386 DECL_CHAIN (decl) = others;
6391 /* error_mark_node appears here when we have an undeclared
6392 variable. Just throw it away. */
6395 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6396 I_SYMBOL_BINDING (b->id) = b->shadowed;
6400 /* Other things that might be encountered. */
6407 b = free_binding_and_advance (b);
6410 arg_info->parms = parms;
6411 arg_info->tags = tags;
6412 arg_info->types = types;
6413 arg_info->others = others;
6414 arg_info->pending_sizes = get_pending_sizes ();
6418 /* Get the struct, enum or union (CODE says which) with tag NAME.
6419 Define the tag as a forward-reference with location LOC if it is
6420 not defined. Return a c_typespec structure for the type
6424 parser_xref_tag (location_t loc, enum tree_code code, tree name)
6426 struct c_typespec ret;
6430 ret.expr = NULL_TREE;
6431 ret.expr_const_operands = true;
6433 /* If a cross reference is requested, look up the type
6434 already defined for this tag and return it. */
6436 ref = lookup_tag (code, name, 0, &refloc);
6437 /* If this is the right type of tag, return what we found.
6438 (This reference will be shadowed by shadow_tag later if appropriate.)
6439 If this is the wrong type of tag, do not return it. If it was the
6440 wrong type in the same scope, we will have had an error
6441 message already; if in a different scope and declaring
6442 a name, pending_xref_error will give an error message; but if in a
6443 different scope and not declaring a name, this tag should
6444 shadow the previous declaration of a different type of tag, and
6445 this would not work properly if we return the reference found.
6446 (For example, with "struct foo" in an outer scope, "union foo;"
6447 must shadow that tag with a new one of union type.) */
6448 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
6449 if (ref && TREE_CODE (ref) == code)
6451 if (C_TYPE_DEFINED_IN_STRUCT (ref)
6452 && loc != UNKNOWN_LOCATION
6458 warning_at (loc, OPT_Wc___compat,
6459 ("enum type defined in struct or union "
6460 "is not visible in C++"));
6461 inform (refloc, "enum type defined here");
6464 warning_at (loc, OPT_Wc___compat,
6465 ("struct defined in struct or union "
6466 "is not visible in C++"));
6467 inform (refloc, "struct defined here");
6470 warning_at (loc, OPT_Wc___compat,
6471 ("union defined in struct or union "
6472 "is not visible in C++"));
6473 inform (refloc, "union defined here");
6484 /* If no such tag is yet defined, create a forward-reference node
6485 and record it as the "definition".
6486 When a real declaration of this type is found,
6487 the forward-reference will be altered into a real type. */
6489 ref = make_node (code);
6490 if (code == ENUMERAL_TYPE)
6492 /* Give the type a default layout like unsigned int
6493 to avoid crashing if it does not get defined. */
6494 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
6495 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
6496 TYPE_USER_ALIGN (ref) = 0;
6497 TYPE_UNSIGNED (ref) = 1;
6498 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
6499 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
6500 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
6503 pushtag (loc, name, ref);
6509 /* Get the struct, enum or union (CODE says which) with tag NAME.
6510 Define the tag as a forward-reference if it is not defined.
6511 Return a tree for the type. */
6514 xref_tag (enum tree_code code, tree name)
6516 return parser_xref_tag (input_location, code, name).spec;
6519 /* Make sure that the tag NAME is defined *in the current scope*
6520 at least as a forward reference.
6521 LOC is the location of the struct's definition.
6522 CODE says which kind of tag NAME ought to be.
6524 This stores the current value of the file static STRUCT_PARSE_INFO
6525 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6526 new c_struct_parse_info structure. The old value of
6527 STRUCT_PARSE_INFO is restored in finish_struct. */
6530 start_struct (location_t loc, enum tree_code code, tree name,
6531 struct c_struct_parse_info **enclosing_struct_parse_info)
6533 /* If there is already a tag defined at this scope
6534 (as a forward reference), just return it. */
6536 tree ref = NULL_TREE;
6537 location_t refloc = UNKNOWN_LOCATION;
6539 if (name != NULL_TREE)
6540 ref = lookup_tag (code, name, 1, &refloc);
6541 if (ref && TREE_CODE (ref) == code)
6543 if (TYPE_SIZE (ref))
6545 if (code == UNION_TYPE)
6546 error_at (loc, "redefinition of %<union %E%>", name);
6548 error_at (loc, "redefinition of %<struct %E%>", name);
6549 if (refloc != UNKNOWN_LOCATION)
6550 inform (refloc, "originally defined here");
6551 /* Don't create structures using a name already in use. */
6554 else if (C_TYPE_BEING_DEFINED (ref))
6556 if (code == UNION_TYPE)
6557 error_at (loc, "nested redefinition of %<union %E%>", name);
6559 error_at (loc, "nested redefinition of %<struct %E%>", name);
6560 /* Don't bother to report "originally defined here" for a
6561 nested redefinition; the original definition should be
6563 /* Don't create structures that contain themselves. */
6568 /* Otherwise create a forward-reference just so the tag is in scope. */
6570 if (ref == NULL_TREE || TREE_CODE (ref) != code)
6572 ref = make_node (code);
6573 pushtag (loc, name, ref);
6576 C_TYPE_BEING_DEFINED (ref) = 1;
6577 TYPE_PACKED (ref) = flag_pack_struct;
6579 *enclosing_struct_parse_info = struct_parse_info;
6580 struct_parse_info = XNEW (struct c_struct_parse_info);
6581 struct_parse_info->struct_types = VEC_alloc (tree, heap, 0);
6582 struct_parse_info->fields = VEC_alloc (c_binding_ptr, heap, 0);
6583 struct_parse_info->typedefs_seen = VEC_alloc (tree, heap, 0);
6585 /* FIXME: This will issue a warning for a use of a type defined
6586 within a statement expr used within sizeof, et. al. This is not
6587 terribly serious as C++ doesn't permit statement exprs within
6589 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
6590 warning_at (loc, OPT_Wc___compat,
6591 "defining type in %qs expression is invalid in C++",
6594 : (in_typeof ? "typeof" : "alignof")));
6599 /* Process the specs, declarator and width (NULL if omitted)
6600 of a structure component, returning a FIELD_DECL node.
6601 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6602 DECL_ATTRS is as for grokdeclarator.
6604 LOC is the location of the structure component.
6606 This is done during the parsing of the struct declaration.
6607 The FIELD_DECL nodes are chained together and the lot of them
6608 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6611 grokfield (location_t loc,
6612 struct c_declarator *declarator, struct c_declspecs *declspecs,
6613 tree width, tree *decl_attrs)
6617 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
6618 && width == NULL_TREE)
6620 /* This is an unnamed decl.
6622 If we have something of the form "union { list } ;" then this
6623 is the anonymous union extension. Similarly for struct.
6625 If this is something of the form "struct foo;", then
6626 If MS or Plan 9 extensions are enabled, this is handled as
6627 an anonymous struct.
6628 Otherwise this is a forward declaration of a structure tag.
6630 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6631 If foo names a structure or union without a tag, then this
6632 is an anonymous struct (this is permitted by C1X).
6633 If MS or Plan 9 extensions are enabled and foo names a
6634 structure, then again this is an anonymous struct.
6635 Otherwise this is an error.
6637 Oh what a horrid tangled web we weave. I wonder if MS consciously
6638 took this from Plan 9 or if it was an accident of implementation
6639 that took root before someone noticed the bug... */
6641 tree type = declspecs->type;
6642 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
6643 || TREE_CODE (type) == UNION_TYPE);
6648 if (flag_ms_extensions || flag_plan9_extensions)
6650 else if (TYPE_NAME (TYPE_MAIN_VARIANT (type)) == NULL)
6657 pedwarn (loc, 0, "declaration does not declare anything");
6663 pedwarn (loc, OPT_pedantic,
6664 "ISO C99 doesn%'t support unnamed structs/unions");
6666 pedwarn (loc, OPT_pedantic,
6667 "ISO C90 doesn%'t support unnamed structs/unions");
6671 value = grokdeclarator (declarator, declspecs, FIELD, false,
6672 width ? &width : NULL, decl_attrs, NULL, NULL,
6675 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
6676 DECL_INITIAL (value) = width;
6678 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
6680 /* If we currently have a binding for this field, set the
6681 in_struct field in the binding, so that we warn about lookups
6683 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
6686 /* If the in_struct field is not yet set, push it on a list
6687 to be cleared when this struct is finished. */
6690 VEC_safe_push (c_binding_ptr, heap,
6691 struct_parse_info->fields, b);
6700 /* Subroutine of detect_field_duplicates: return whether X and Y,
6701 which are both fields in the same struct, have duplicate field
6705 is_duplicate_field (tree x, tree y)
6707 if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y))
6710 /* When using -fplan9-extensions, an anonymous field whose name is a
6711 typedef can duplicate a field name. */
6712 if (flag_plan9_extensions
6713 && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE))
6715 tree xt, xn, yt, yn;
6718 if (DECL_NAME (x) != NULL_TREE)
6720 else if ((TREE_CODE (xt) == RECORD_TYPE || TREE_CODE (xt) == UNION_TYPE)
6721 && TYPE_NAME (xt) != NULL_TREE
6722 && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL)
6723 xn = DECL_NAME (TYPE_NAME (xt));
6728 if (DECL_NAME (y) != NULL_TREE)
6730 else if ((TREE_CODE (yt) == RECORD_TYPE || TREE_CODE (yt) == UNION_TYPE)
6731 && TYPE_NAME (yt) != NULL_TREE
6732 && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL)
6733 yn = DECL_NAME (TYPE_NAME (yt));
6737 if (xn != NULL_TREE && xn == yn)
6744 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
6745 to HTAB, giving errors for any duplicates. */
6748 detect_field_duplicates_hash (tree fieldlist, htab_t htab)
6753 for (x = fieldlist; x ; x = DECL_CHAIN (x))
6754 if ((y = DECL_NAME (x)) != 0)
6756 slot = htab_find_slot (htab, y, INSERT);
6759 error ("duplicate member %q+D", x);
6760 DECL_NAME (x) = NULL_TREE;
6764 else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
6765 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
6767 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab);
6769 /* When using -fplan9-extensions, an anonymous field whose
6770 name is a typedef can duplicate a field name. */
6771 if (flag_plan9_extensions
6772 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
6773 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)
6775 tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x)));
6776 slot = htab_find_slot (htab, xn, INSERT);
6778 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x)));
6784 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6785 the list such that this does not present a problem later. */
6788 detect_field_duplicates (tree fieldlist)
6793 /* If the struct is the list of instance variables of an Objective-C
6794 class, then we need to add all the instance variables of
6795 superclasses before checking for duplicates (since you can't have
6796 an instance variable in a subclass with the same name as an
6797 instance variable in a superclass). objc_get_interface_ivars()
6798 leaves fieldlist unchanged if we are not in this case, so in that
6799 case nothing changes compared to C.
6801 if (c_dialect_objc ())
6802 fieldlist = objc_get_interface_ivars (fieldlist);
6804 /* First, see if there are more than "a few" fields.
6805 This is trivially true if there are zero or one fields. */
6808 x = DECL_CHAIN (fieldlist);
6813 if (DECL_NAME (x) == NULL_TREE
6814 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
6815 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
6818 } while (timeout > 0 && x);
6820 /* If there were "few" fields and no anonymous structures or unions,
6821 avoid the overhead of allocating a hash table. Instead just do
6822 the nested traversal thing. */
6825 for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x))
6826 /* When using -fplan9-extensions, we can have duplicates
6827 between typedef names and fields. */
6829 || (flag_plan9_extensions
6830 && DECL_NAME (x) == NULL_TREE
6831 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
6832 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
6833 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
6834 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL))
6836 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
6837 if (is_duplicate_field (y, x))
6839 error ("duplicate member %q+D", x);
6840 DECL_NAME (x) = NULL_TREE;
6846 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
6848 detect_field_duplicates_hash (fieldlist, htab);
6853 /* Finish up struct info used by -Wc++-compat. */
6856 warn_cxx_compat_finish_struct (tree fieldlist)
6860 struct c_binding *b;
6862 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
6863 the current struct. We do this now at the end of the struct
6864 because the flag is used to issue visibility warnings, and we
6865 only want to issue those warnings if the type is referenced
6866 outside of the struct declaration. */
6867 FOR_EACH_VEC_ELT (tree, struct_parse_info->struct_types, ix, x)
6868 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
6870 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
6871 typedefs used when declaring fields in this struct. If the name
6872 of any of the fields is also a typedef name then the struct would
6873 not parse in C++, because the C++ lookup rules say that the
6874 typedef name would be looked up in the context of the struct, and
6875 would thus be the field rather than the typedef. */
6876 if (!VEC_empty (tree, struct_parse_info->typedefs_seen)
6877 && fieldlist != NULL_TREE)
6879 /* Use a pointer_set using the name of the typedef. We can use
6880 a pointer_set because identifiers are interned. */
6881 struct pointer_set_t *tset = pointer_set_create ();
6883 FOR_EACH_VEC_ELT (tree, struct_parse_info->typedefs_seen, ix, x)
6884 pointer_set_insert (tset, DECL_NAME (x));
6886 for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x))
6888 if (DECL_NAME (x) != NULL_TREE
6889 && pointer_set_contains (tset, DECL_NAME (x)))
6891 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
6892 ("using %qD as both field and typedef name is "
6895 /* FIXME: It would be nice to report the location where
6896 the typedef name is used. */
6900 pointer_set_destroy (tset);
6903 /* For each field which has a binding and which was not defined in
6904 an enclosing struct, clear the in_struct field. */
6905 FOR_EACH_VEC_ELT (c_binding_ptr, struct_parse_info->fields, ix, b)
6909 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
6910 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
6911 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
6912 ATTRIBUTES are attributes to be applied to the structure.
6914 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
6915 the struct was started. */
6918 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
6919 struct c_struct_parse_info *enclosing_struct_parse_info)
6922 bool toplevel = file_scope == current_scope;
6923 int saw_named_field;
6925 /* If this type was previously laid out as a forward reference,
6926 make sure we lay it out again. */
6930 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
6934 for (x = fieldlist; x; x = DECL_CHAIN (x))
6936 if (DECL_NAME (x) != 0)
6939 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
6940 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
6946 if (TREE_CODE (t) == UNION_TYPE)
6949 pedwarn (loc, OPT_pedantic, "union has no named members");
6951 pedwarn (loc, OPT_pedantic, "union has no members");
6956 pedwarn (loc, OPT_pedantic, "struct has no named members");
6958 pedwarn (loc, OPT_pedantic, "struct has no members");
6963 /* Install struct as DECL_CONTEXT of each field decl.
6964 Also process specified field sizes, found in the DECL_INITIAL,
6965 storing 0 there after the type has been changed to precision equal
6966 to its width, rather than the precision of the specified standard
6967 type. (Correct layout requires the original type to have been preserved
6970 saw_named_field = 0;
6971 for (x = fieldlist; x; x = DECL_CHAIN (x))
6973 if (TREE_TYPE (x) == error_mark_node)
6976 DECL_CONTEXT (x) = t;
6978 /* If any field is const, the structure type is pseudo-const. */
6979 if (TREE_READONLY (x))
6980 C_TYPE_FIELDS_READONLY (t) = 1;
6983 /* A field that is pseudo-const makes the structure likewise. */
6984 tree t1 = strip_array_types (TREE_TYPE (x));
6985 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
6986 && C_TYPE_FIELDS_READONLY (t1))
6987 C_TYPE_FIELDS_READONLY (t) = 1;
6990 /* Any field that is volatile means variables of this type must be
6991 treated in some ways as volatile. */
6992 if (TREE_THIS_VOLATILE (x))
6993 C_TYPE_FIELDS_VOLATILE (t) = 1;
6995 /* Any field of nominal variable size implies structure is too. */
6996 if (C_DECL_VARIABLE_SIZE (x))
6997 C_TYPE_VARIABLE_SIZE (t) = 1;
6999 if (DECL_INITIAL (x))
7001 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
7002 DECL_SIZE (x) = bitsize_int (width);
7003 DECL_BIT_FIELD (x) = 1;
7004 SET_DECL_C_BIT_FIELD (x);
7008 && (DECL_BIT_FIELD (x)
7009 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
7010 DECL_PACKED (x) = 1;
7012 /* Detect flexible array member in an invalid context. */
7013 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
7014 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
7015 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
7016 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
7018 if (TREE_CODE (t) == UNION_TYPE)
7020 error_at (DECL_SOURCE_LOCATION (x),
7021 "flexible array member in union");
7022 TREE_TYPE (x) = error_mark_node;
7024 else if (DECL_CHAIN (x) != NULL_TREE)
7026 error_at (DECL_SOURCE_LOCATION (x),
7027 "flexible array member not at end of struct");
7028 TREE_TYPE (x) = error_mark_node;
7030 else if (!saw_named_field)
7032 error_at (DECL_SOURCE_LOCATION (x),
7033 "flexible array member in otherwise empty struct");
7034 TREE_TYPE (x) = error_mark_node;
7038 if (pedantic && TREE_CODE (t) == RECORD_TYPE
7039 && flexible_array_type_p (TREE_TYPE (x)))
7040 pedwarn (DECL_SOURCE_LOCATION (x), OPT_pedantic,
7041 "invalid use of structure with flexible array member");
7044 || TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7045 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7046 saw_named_field = 1;
7049 detect_field_duplicates (fieldlist);
7051 /* Now we have the nearly final fieldlist. Record it,
7052 then lay out the structure or union (including the fields). */
7054 TYPE_FIELDS (t) = fieldlist;
7058 /* Give bit-fields their proper types. */
7060 tree *fieldlistp = &fieldlist;
7062 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
7063 && TREE_TYPE (*fieldlistp) != error_mark_node)
7065 unsigned HOST_WIDE_INT width
7066 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
7067 tree type = TREE_TYPE (*fieldlistp);
7068 if (width != TYPE_PRECISION (type))
7070 TREE_TYPE (*fieldlistp)
7071 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
7072 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
7074 DECL_INITIAL (*fieldlistp) = 0;
7077 fieldlistp = &DECL_CHAIN (*fieldlistp);
7080 /* Now we have the truly final field list.
7081 Store it in this type and in the variants. */
7083 TYPE_FIELDS (t) = fieldlist;
7085 /* If there are lots of fields, sort so we can look through them fast.
7086 We arbitrarily consider 16 or more elts to be "a lot". */
7091 for (x = fieldlist; x; x = DECL_CHAIN (x))
7093 if (len > 15 || DECL_NAME (x) == NULL)
7101 struct lang_type *space;
7102 struct sorted_fields_type *space2;
7104 len += list_length (x);
7106 /* Use the same allocation policy here that make_node uses, to
7107 ensure that this lives as long as the rest of the struct decl.
7108 All decls in an inline function need to be saved. */
7110 space = ggc_alloc_cleared_lang_type (sizeof (struct lang_type));
7111 space2 = ggc_alloc_sorted_fields_type
7112 (sizeof (struct sorted_fields_type) + len * sizeof (tree));
7116 field_array = &space2->elts[0];
7117 for (x = fieldlist; x; x = DECL_CHAIN (x))
7119 field_array[len++] = x;
7121 /* If there is anonymous struct or union, break out of the loop. */
7122 if (DECL_NAME (x) == NULL)
7125 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7128 TYPE_LANG_SPECIFIC (t) = space;
7129 TYPE_LANG_SPECIFIC (t)->s->len = len;
7130 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
7131 qsort (field_array, len, sizeof (tree), field_decl_cmp);
7136 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
7138 TYPE_FIELDS (x) = TYPE_FIELDS (t);
7139 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
7140 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
7141 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
7142 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
7145 /* If this was supposed to be a transparent union, but we can't
7146 make it one, warn and turn off the flag. */
7147 if (TREE_CODE (t) == UNION_TYPE
7148 && TYPE_TRANSPARENT_AGGR (t)
7149 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
7151 TYPE_TRANSPARENT_AGGR (t) = 0;
7152 warning_at (loc, 0, "union cannot be made transparent");
7155 /* If this structure or union completes the type of any previous
7156 variable declaration, lay it out and output its rtl. */
7157 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
7161 tree decl = TREE_VALUE (x);
7162 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
7163 layout_array_type (TREE_TYPE (decl));
7164 if (TREE_CODE (decl) != TYPE_DECL)
7166 layout_decl (decl, 0);
7167 if (c_dialect_objc ())
7168 objc_check_decl (decl);
7169 rest_of_decl_compilation (decl, toplevel, 0);
7174 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
7176 /* Update type location to the one of the definition, instead of e.g.
7177 a forward declaration. */
7178 if (TYPE_STUB_DECL (t))
7179 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
7181 /* Finish debugging output for this type. */
7182 rest_of_type_compilation (t, toplevel);
7184 /* If we're inside a function proper, i.e. not file-scope and not still
7185 parsing parameters, then arrange for the size of a variable sized type
7187 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
7188 add_stmt (build_stmt (loc,
7189 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
7191 if (warn_cxx_compat)
7192 warn_cxx_compat_finish_struct (fieldlist);
7194 VEC_free (tree, heap, struct_parse_info->struct_types);
7195 VEC_free (c_binding_ptr, heap, struct_parse_info->fields);
7196 VEC_free (tree, heap, struct_parse_info->typedefs_seen);
7197 XDELETE (struct_parse_info);
7199 struct_parse_info = enclosing_struct_parse_info;
7201 /* If this struct is defined inside a struct, add it to
7204 && struct_parse_info != NULL
7205 && !in_sizeof && !in_typeof && !in_alignof)
7206 VEC_safe_push (tree, heap, struct_parse_info->struct_types, t);
7211 /* Lay out the type T, and its element type, and so on. */
7214 layout_array_type (tree t)
7216 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
7217 layout_array_type (TREE_TYPE (t));
7221 /* Begin compiling the definition of an enumeration type.
7222 NAME is its name (or null if anonymous).
7223 LOC is the enum's location.
7224 Returns the type object, as yet incomplete.
7225 Also records info about it so that build_enumerator
7226 may be used to declare the individual values as they are read. */
7229 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
7231 tree enumtype = NULL_TREE;
7232 location_t enumloc = UNKNOWN_LOCATION;
7234 /* If this is the real definition for a previous forward reference,
7235 fill in the contents in the same object that used to be the
7236 forward reference. */
7238 if (name != NULL_TREE)
7239 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc);
7241 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
7243 enumtype = make_node (ENUMERAL_TYPE);
7244 pushtag (loc, name, enumtype);
7247 if (C_TYPE_BEING_DEFINED (enumtype))
7248 error_at (loc, "nested redefinition of %<enum %E%>", name);
7250 C_TYPE_BEING_DEFINED (enumtype) = 1;
7252 if (TYPE_VALUES (enumtype) != 0)
7254 /* This enum is a named one that has been declared already. */
7255 error_at (loc, "redeclaration of %<enum %E%>", name);
7256 if (enumloc != UNKNOWN_LOCATION)
7257 inform (enumloc, "originally defined here");
7259 /* Completely replace its old definition.
7260 The old enumerators remain defined, however. */
7261 TYPE_VALUES (enumtype) = 0;
7264 the_enum->enum_next_value = integer_zero_node;
7265 the_enum->enum_overflow = 0;
7267 if (flag_short_enums)
7268 TYPE_PACKED (enumtype) = 1;
7270 /* FIXME: This will issue a warning for a use of a type defined
7271 within sizeof in a statement expr. This is not terribly serious
7272 as C++ doesn't permit statement exprs within sizeof anyhow. */
7273 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7274 warning_at (loc, OPT_Wc___compat,
7275 "defining type in %qs expression is invalid in C++",
7278 : (in_typeof ? "typeof" : "alignof")));
7283 /* After processing and defining all the values of an enumeration type,
7284 install their decls in the enumeration type and finish it off.
7285 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7286 and ATTRIBUTES are the specified attributes.
7287 Returns ENUMTYPE. */
7290 finish_enum (tree enumtype, tree values, tree attributes)
7293 tree minnode = 0, maxnode = 0;
7294 int precision, unsign;
7295 bool toplevel = (file_scope == current_scope);
7296 struct lang_type *lt;
7298 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7300 /* Calculate the maximum value of any enumerator in this type. */
7302 if (values == error_mark_node)
7303 minnode = maxnode = integer_zero_node;
7306 minnode = maxnode = TREE_VALUE (values);
7307 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
7309 tree value = TREE_VALUE (pair);
7310 if (tree_int_cst_lt (maxnode, value))
7312 if (tree_int_cst_lt (value, minnode))
7317 /* Construct the final type of this enumeration. It is the same
7318 as one of the integral types - the narrowest one that fits, except
7319 that normally we only go as narrow as int - and signed iff any of
7320 the values are negative. */
7321 unsign = (tree_int_cst_sgn (minnode) >= 0);
7322 precision = MAX (tree_int_cst_min_precision (minnode, unsign),
7323 tree_int_cst_min_precision (maxnode, unsign));
7325 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
7327 tem = c_common_type_for_size (precision, unsign);
7330 warning (0, "enumeration values exceed range of largest integer");
7331 tem = long_long_integer_type_node;
7335 tem = unsign ? unsigned_type_node : integer_type_node;
7337 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
7338 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
7339 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
7340 TYPE_SIZE (enumtype) = 0;
7342 /* If the precision of the type was specific with an attribute and it
7343 was too small, give an error. Otherwise, use it. */
7344 if (TYPE_PRECISION (enumtype))
7346 if (precision > TYPE_PRECISION (enumtype))
7347 error ("specified mode too small for enumeral values");
7350 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
7352 layout_type (enumtype);
7354 if (values != error_mark_node)
7356 /* Change the type of the enumerators to be the enum type. We
7357 need to do this irrespective of the size of the enum, for
7358 proper type checking. Replace the DECL_INITIALs of the
7359 enumerators, and the value slots of the list, with copies
7360 that have the enum type; they cannot be modified in place
7361 because they may be shared (e.g. integer_zero_node) Finally,
7362 change the purpose slots to point to the names of the decls. */
7363 for (pair = values; pair; pair = TREE_CHAIN (pair))
7365 tree enu = TREE_PURPOSE (pair);
7366 tree ini = DECL_INITIAL (enu);
7368 TREE_TYPE (enu) = enumtype;
7370 /* The ISO C Standard mandates enumerators to have type int,
7371 even though the underlying type of an enum type is
7372 unspecified. However, GCC allows enumerators of any
7373 integer type as an extensions. build_enumerator()
7374 converts any enumerators that fit in an int to type int,
7375 to avoid promotions to unsigned types when comparing
7376 integers with enumerators that fit in the int range.
7377 When -pedantic is given, build_enumerator() would have
7378 already warned about those that don't fit. Here we
7379 convert the rest to the enumerator type. */
7380 if (TREE_TYPE (ini) != integer_type_node)
7381 ini = convert (enumtype, ini);
7383 DECL_INITIAL (enu) = ini;
7384 TREE_PURPOSE (pair) = DECL_NAME (enu);
7385 TREE_VALUE (pair) = ini;
7388 TYPE_VALUES (enumtype) = values;
7391 /* Record the min/max values so that we can warn about bit-field
7392 enumerations that are too small for the values. */
7393 lt = ggc_alloc_cleared_lang_type (sizeof (struct lang_type));
7394 lt->enum_min = minnode;
7395 lt->enum_max = maxnode;
7396 TYPE_LANG_SPECIFIC (enumtype) = lt;
7398 /* Fix up all variant types of this enum type. */
7399 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
7401 if (tem == enumtype)
7403 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
7404 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
7405 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
7406 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
7407 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
7408 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
7409 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
7410 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
7411 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
7412 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
7413 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
7416 /* Finish debugging output for this type. */
7417 rest_of_type_compilation (enumtype, toplevel);
7419 /* If this enum is defined inside a struct, add it to
7422 && struct_parse_info != NULL
7423 && !in_sizeof && !in_typeof && !in_alignof)
7424 VEC_safe_push (tree, heap, struct_parse_info->struct_types, enumtype);
7429 /* Build and install a CONST_DECL for one value of the
7430 current enumeration type (one that was begun with start_enum).
7431 DECL_LOC is the location of the enumerator.
7432 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7433 Return a tree-list containing the CONST_DECL and its value.
7434 Assignment of sequential values by default is handled here. */
7437 build_enumerator (location_t decl_loc, location_t loc,
7438 struct c_enum_contents *the_enum, tree name, tree value)
7442 /* Validate and default VALUE. */
7446 /* Don't issue more errors for error_mark_node (i.e. an
7447 undeclared identifier) - just ignore the value expression. */
7448 if (value == error_mark_node)
7450 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
7452 error_at (loc, "enumerator value for %qE is not an integer constant",
7458 if (TREE_CODE (value) != INTEGER_CST)
7460 value = c_fully_fold (value, false, NULL);
7461 if (TREE_CODE (value) == INTEGER_CST)
7462 pedwarn (loc, OPT_pedantic,
7463 "enumerator value for %qE is not an integer "
7464 "constant expression", name);
7466 if (TREE_CODE (value) != INTEGER_CST)
7468 error ("enumerator value for %qE is not an integer constant",
7474 value = default_conversion (value);
7475 constant_expression_warning (value);
7480 /* Default based on previous value. */
7481 /* It should no longer be possible to have NON_LVALUE_EXPR
7485 value = the_enum->enum_next_value;
7486 if (the_enum->enum_overflow)
7487 error_at (loc, "overflow in enumeration values");
7489 /* Even though the underlying type of an enum is unspecified, the
7490 type of enumeration constants is explicitly defined as int
7491 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7493 else if (!int_fits_type_p (value, integer_type_node))
7494 pedwarn (loc, OPT_pedantic,
7495 "ISO C restricts enumerator values to range of %<int%>");
7497 /* The ISO C Standard mandates enumerators to have type int, even
7498 though the underlying type of an enum type is unspecified.
7499 However, GCC allows enumerators of any integer type as an
7500 extensions. Here we convert any enumerators that fit in an int
7501 to type int, to avoid promotions to unsigned types when comparing
7502 integers with enumerators that fit in the int range. When
7503 -pedantic is given, we would have already warned about those that
7504 don't fit. We have to do this here rather than in finish_enum
7505 because this value may be used to define more enumerators. */
7506 if (int_fits_type_p (value, integer_type_node))
7507 value = convert (integer_type_node, value);
7509 /* Set basis for default for next value. */
7510 the_enum->enum_next_value
7511 = build_binary_op (EXPR_LOC_OR_HERE (value),
7512 PLUS_EXPR, value, integer_one_node, 0);
7513 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
7515 /* Now create a declaration for the enum value name. */
7517 type = TREE_TYPE (value);
7518 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
7519 TYPE_PRECISION (integer_type_node)),
7520 (TYPE_PRECISION (type)
7521 >= TYPE_PRECISION (integer_type_node)
7522 && TYPE_UNSIGNED (type)));
7524 decl = build_decl (decl_loc, CONST_DECL, name, type);
7525 DECL_INITIAL (decl) = convert (type, value);
7528 return tree_cons (decl, value, NULL_TREE);
7532 /* Create the FUNCTION_DECL for a function definition.
7533 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7534 the declaration; they describe the function's name and the type it returns,
7535 but twisted together in a fashion that parallels the syntax of C.
7537 This function creates a binding context for the function body
7538 as well as setting up the FUNCTION_DECL in current_function_decl.
7540 Returns 1 on success. If the DECLARATOR is not suitable for a function
7541 (it defines a datum instead), we return 0, which tells
7542 yyparse to report a parse error. */
7545 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
7548 tree decl1, old_decl;
7549 tree restype, resdecl;
7552 current_function_returns_value = 0; /* Assume, until we see it does. */
7553 current_function_returns_null = 0;
7554 current_function_returns_abnormally = 0;
7555 warn_about_return_type = 0;
7556 c_switch_stack = NULL;
7558 /* Indicate no valid break/continue context by setting these variables
7559 to some non-null, non-label value. We'll notice and emit the proper
7560 error message in c_finish_bc_stmt. */
7561 c_break_label = c_cont_label = size_zero_node;
7563 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
7564 &attributes, NULL, NULL, DEPRECATED_NORMAL);
7566 /* If the declarator is not suitable for a function definition,
7567 cause a syntax error. */
7571 loc = DECL_SOURCE_LOCATION (decl1);
7573 decl_attributes (&decl1, attributes, 0);
7575 if (DECL_DECLARED_INLINE_P (decl1)
7576 && DECL_UNINLINABLE (decl1)
7577 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
7578 warning_at (loc, OPT_Wattributes,
7579 "inline function %qD given attribute noinline",
7582 /* Handle gnu_inline attribute. */
7583 if (declspecs->inline_p
7584 && !flag_gnu89_inline
7585 && TREE_CODE (decl1) == FUNCTION_DECL
7586 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
7587 || current_function_decl))
7589 if (declspecs->storage_class != csc_static)
7590 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
7593 announce_function (decl1);
7595 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
7597 error_at (loc, "return type is an incomplete type");
7598 /* Make it return void instead. */
7600 = build_function_type (void_type_node,
7601 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
7604 if (warn_about_return_type)
7605 pedwarn_c99 (loc, flag_isoc99 ? 0
7606 : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
7607 "return type defaults to %<int%>");
7609 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7610 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7611 DECL_INITIAL (decl1) = error_mark_node;
7613 /* A nested function is not global. */
7614 if (current_function_decl != 0)
7615 TREE_PUBLIC (decl1) = 0;
7617 /* If this definition isn't a prototype and we had a prototype declaration
7618 before, copy the arg type info from that prototype. */
7619 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
7620 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
7622 current_function_prototype_locus = UNKNOWN_LOCATION;
7623 current_function_prototype_built_in = false;
7624 current_function_prototype_arg_types = NULL_TREE;
7625 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
7627 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
7628 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7629 TREE_TYPE (TREE_TYPE (old_decl))))
7631 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
7633 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
7634 current_function_prototype_built_in
7635 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
7636 current_function_prototype_arg_types
7637 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
7639 if (TREE_PUBLIC (decl1))
7641 /* If there is an external prototype declaration of this
7642 function, record its location but do not copy information
7643 to this decl. This may be an invisible declaration
7644 (built-in or in a scope which has finished) or simply
7645 have more refined argument types than any declaration
7647 struct c_binding *b;
7648 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
7649 if (B_IN_SCOPE (b, external_scope))
7653 tree ext_decl, ext_type;
7655 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
7656 if (TREE_CODE (ext_type) == FUNCTION_TYPE
7657 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7658 TREE_TYPE (ext_type)))
7660 current_function_prototype_locus
7661 = DECL_SOURCE_LOCATION (ext_decl);
7662 current_function_prototype_built_in
7663 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
7664 current_function_prototype_arg_types
7665 = TYPE_ARG_TYPES (ext_type);
7671 /* Optionally warn of old-fashioned def with no previous prototype. */
7672 if (warn_strict_prototypes
7673 && old_decl != error_mark_node
7674 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
7675 && C_DECL_ISNT_PROTOTYPE (old_decl))
7676 warning_at (loc, OPT_Wstrict_prototypes,
7677 "function declaration isn%'t a prototype");
7678 /* Optionally warn of any global def with no previous prototype. */
7679 else if (warn_missing_prototypes
7680 && old_decl != error_mark_node
7681 && TREE_PUBLIC (decl1)
7682 && !MAIN_NAME_P (DECL_NAME (decl1))
7683 && C_DECL_ISNT_PROTOTYPE (old_decl))
7684 warning_at (loc, OPT_Wmissing_prototypes,
7685 "no previous prototype for %qD", decl1);
7686 /* Optionally warn of any def with no previous prototype
7687 if the function has already been used. */
7688 else if (warn_missing_prototypes
7690 && old_decl != error_mark_node
7691 && TREE_USED (old_decl)
7692 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
7693 warning_at (loc, OPT_Wmissing_prototypes,
7694 "%qD was used with no prototype before its definition", decl1);
7695 /* Optionally warn of any global def with no previous declaration. */
7696 else if (warn_missing_declarations
7697 && TREE_PUBLIC (decl1)
7699 && !MAIN_NAME_P (DECL_NAME (decl1)))
7700 warning_at (loc, OPT_Wmissing_declarations,
7701 "no previous declaration for %qD",
7703 /* Optionally warn of any def with no previous declaration
7704 if the function has already been used. */
7705 else if (warn_missing_declarations
7707 && old_decl != error_mark_node
7708 && TREE_USED (old_decl)
7709 && C_DECL_IMPLICIT (old_decl))
7710 warning_at (loc, OPT_Wmissing_declarations,
7711 "%qD was used with no declaration before its definition", decl1);
7713 /* This function exists in static storage.
7714 (This does not mean `static' in the C sense!) */
7715 TREE_STATIC (decl1) = 1;
7717 /* This is the earliest point at which we might know the assembler
7718 name of the function. Thus, if it's set before this, die horribly. */
7719 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
7721 /* If #pragma weak was used, mark the decl weak now. */
7722 if (current_scope == file_scope)
7723 maybe_apply_pragma_weak (decl1);
7725 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7726 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
7728 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
7729 != integer_type_node)
7730 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
7732 check_main_parameter_types (decl1);
7734 if (!TREE_PUBLIC (decl1))
7735 pedwarn (loc, OPT_Wmain,
7736 "%qD is normally a non-static function", decl1);
7739 /* Record the decl so that the function name is defined.
7740 If we already have a decl for this name, and it is a FUNCTION_DECL,
7741 use the old decl. */
7743 current_function_decl = pushdecl (decl1);
7746 declare_parm_level ();
7748 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
7749 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
7750 DECL_ARTIFICIAL (resdecl) = 1;
7751 DECL_IGNORED_P (resdecl) = 1;
7752 DECL_RESULT (current_function_decl) = resdecl;
7754 start_fname_decls ();
7759 /* Subroutine of store_parm_decls which handles new-style function
7760 definitions (prototype format). The parms already have decls, so we
7761 need only record them as in effect and complain if any redundant
7762 old-style parm decls were written. */
7764 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
7770 if (current_scope->bindings)
7772 error_at (DECL_SOURCE_LOCATION (fndecl),
7773 "old-style parameter declarations in prototyped "
7774 "function definition");
7776 /* Get rid of the old-style declarations. */
7780 /* Don't issue this warning for nested functions, and don't issue this
7781 warning if we got here because ARG_INFO_TYPES was error_mark_node
7782 (this happens when a function definition has just an ellipsis in
7783 its parameter list). */
7784 else if (!in_system_header && !current_function_scope
7785 && arg_info->types != error_mark_node)
7786 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
7787 "traditional C rejects ISO C style function definitions");
7789 /* Now make all the parameter declarations visible in the function body.
7790 We can bypass most of the grunt work of pushdecl. */
7791 for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl))
7793 DECL_CONTEXT (decl) = current_function_decl;
7794 if (DECL_NAME (decl))
7796 bind (DECL_NAME (decl), decl, current_scope,
7797 /*invisible=*/false, /*nested=*/false,
7799 if (!TREE_USED (decl))
7800 warn_if_shadowing (decl);
7803 error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted");
7806 /* Record the parameter list in the function declaration. */
7807 DECL_ARGUMENTS (fndecl) = arg_info->parms;
7809 /* Now make all the ancillary declarations visible, likewise. */
7810 for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl))
7812 DECL_CONTEXT (decl) = current_function_decl;
7813 if (DECL_NAME (decl))
7814 bind (DECL_NAME (decl), decl, current_scope,
7815 /*invisible=*/false,
7816 /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL),
7820 /* And all the tag declarations. */
7821 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag, arg_info->tags, ix, tag)
7823 bind (tag->id, tag->type, current_scope,
7824 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
7827 /* Subroutine of store_parm_decls which handles old-style function
7828 definitions (separate parameter list and declarations). */
7831 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
7833 struct c_binding *b;
7834 tree parm, decl, last;
7835 tree parmids = arg_info->parms;
7836 struct pointer_set_t *seen_args = pointer_set_create ();
7838 if (!in_system_header)
7839 warning_at (DECL_SOURCE_LOCATION (fndecl),
7840 OPT_Wold_style_definition, "old-style function definition");
7842 /* Match each formal parameter name with its declaration. Save each
7843 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7844 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
7846 if (TREE_VALUE (parm) == 0)
7848 error_at (DECL_SOURCE_LOCATION (fndecl),
7849 "parameter name missing from parameter list");
7850 TREE_PURPOSE (parm) = 0;
7854 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
7855 if (b && B_IN_CURRENT_SCOPE (b))
7858 /* Skip erroneous parameters. */
7859 if (decl == error_mark_node)
7861 /* If we got something other than a PARM_DECL it is an error. */
7862 if (TREE_CODE (decl) != PARM_DECL)
7863 error_at (DECL_SOURCE_LOCATION (decl),
7864 "%qD declared as a non-parameter", decl);
7865 /* If the declaration is already marked, we have a duplicate
7866 name. Complain and ignore the duplicate. */
7867 else if (pointer_set_contains (seen_args, decl))
7869 error_at (DECL_SOURCE_LOCATION (decl),
7870 "multiple parameters named %qD", decl);
7871 TREE_PURPOSE (parm) = 0;
7874 /* If the declaration says "void", complain and turn it into
7876 else if (VOID_TYPE_P (TREE_TYPE (decl)))
7878 error_at (DECL_SOURCE_LOCATION (decl),
7879 "parameter %qD declared with void type", decl);
7880 TREE_TYPE (decl) = integer_type_node;
7881 DECL_ARG_TYPE (decl) = integer_type_node;
7882 layout_decl (decl, 0);
7884 warn_if_shadowing (decl);
7886 /* If no declaration found, default to int. */
7889 /* FIXME diagnostics: This should be the location of the argument,
7890 not the FNDECL. E.g., for an old-style declaration
7892 int f10(v) { blah; }
7894 We should use the location of the V, not the F10.
7895 Unfortunately, the V is an IDENTIFIER_NODE which has no
7896 location. In the future we need locations for c_arg_info
7899 See gcc.dg/Wshadow-3.c for an example of this problem. */
7900 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
7901 PARM_DECL, TREE_VALUE (parm), integer_type_node);
7902 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
7904 warn_if_shadowing (decl);
7907 pedwarn (DECL_SOURCE_LOCATION (decl),
7908 0, "type of %qD defaults to %<int%>", decl);
7910 warning_at (DECL_SOURCE_LOCATION (decl),
7911 OPT_Wmissing_parameter_type,
7912 "type of %qD defaults to %<int%>", decl);
7915 TREE_PURPOSE (parm) = decl;
7916 pointer_set_insert (seen_args, decl);
7919 /* Now examine the parms chain for incomplete declarations
7920 and declarations with no corresponding names. */
7922 for (b = current_scope->bindings; b; b = b->prev)
7925 if (TREE_CODE (parm) != PARM_DECL)
7928 if (TREE_TYPE (parm) != error_mark_node
7929 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
7931 error_at (DECL_SOURCE_LOCATION (parm),
7932 "parameter %qD has incomplete type", parm);
7933 TREE_TYPE (parm) = error_mark_node;
7936 if (!pointer_set_contains (seen_args, parm))
7938 error_at (DECL_SOURCE_LOCATION (parm),
7939 "declaration for parameter %qD but no such parameter",
7942 /* Pretend the parameter was not missing.
7943 This gets us to a standard state and minimizes
7944 further error messages. */
7945 parmids = chainon (parmids, tree_cons (parm, 0, 0));
7949 /* Chain the declarations together in the order of the list of
7950 names. Store that chain in the function decl, replacing the
7951 list of names. Update the current scope to match. */
7952 DECL_ARGUMENTS (fndecl) = 0;
7954 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
7955 if (TREE_PURPOSE (parm))
7957 if (parm && TREE_PURPOSE (parm))
7959 last = TREE_PURPOSE (parm);
7960 DECL_ARGUMENTS (fndecl) = last;
7962 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
7963 if (TREE_PURPOSE (parm))
7965 DECL_CHAIN (last) = TREE_PURPOSE (parm);
7966 last = TREE_PURPOSE (parm);
7968 DECL_CHAIN (last) = 0;
7971 pointer_set_destroy (seen_args);
7973 /* If there was a previous prototype,
7974 set the DECL_ARG_TYPE of each argument according to
7975 the type previously specified, and report any mismatches. */
7977 if (current_function_prototype_arg_types)
7980 for (parm = DECL_ARGUMENTS (fndecl),
7981 type = current_function_prototype_arg_types;
7982 parm || (type && TREE_VALUE (type) != error_mark_node
7983 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
7984 parm = DECL_CHAIN (parm), type = TREE_CHAIN (type))
7986 if (parm == 0 || type == 0
7987 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
7989 if (current_function_prototype_built_in)
7990 warning_at (DECL_SOURCE_LOCATION (fndecl),
7991 0, "number of arguments doesn%'t match "
7992 "built-in prototype");
7995 /* FIXME diagnostics: This should be the location of
7996 FNDECL, but there is bug when a prototype is
7997 declared inside function context, but defined
7998 outside of it (e.g., gcc.dg/pr15698-2.c). In
7999 which case FNDECL gets the location of the
8000 prototype, not the definition. */
8001 error_at (input_location,
8002 "number of arguments doesn%'t match prototype");
8004 error_at (current_function_prototype_locus,
8005 "prototype declaration");
8009 /* Type for passing arg must be consistent with that
8010 declared for the arg. ISO C says we take the unqualified
8011 type for parameters declared with qualified type. */
8012 if (TREE_TYPE (parm) != error_mark_node
8013 && TREE_TYPE (type) != error_mark_node
8014 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
8015 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
8017 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
8018 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
8020 /* Adjust argument to match prototype. E.g. a previous
8021 `int foo(float);' prototype causes
8022 `int foo(x) float x; {...}' to be treated like
8023 `int foo(float x) {...}'. This is particularly
8024 useful for argument types like uid_t. */
8025 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
8027 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
8028 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
8029 && TYPE_PRECISION (TREE_TYPE (parm))
8030 < TYPE_PRECISION (integer_type_node))
8031 DECL_ARG_TYPE (parm) = integer_type_node;
8033 /* ??? Is it possible to get here with a
8034 built-in prototype or will it always have
8035 been diagnosed as conflicting with an
8036 old-style definition and discarded? */
8037 if (current_function_prototype_built_in)
8038 warning_at (DECL_SOURCE_LOCATION (parm),
8039 OPT_pedantic, "promoted argument %qD "
8040 "doesn%'t match built-in prototype", parm);
8043 pedwarn (DECL_SOURCE_LOCATION (parm),
8044 OPT_pedantic, "promoted argument %qD "
8045 "doesn%'t match prototype", parm);
8046 pedwarn (current_function_prototype_locus, OPT_pedantic,
8047 "prototype declaration");
8052 if (current_function_prototype_built_in)
8053 warning_at (DECL_SOURCE_LOCATION (parm),
8054 0, "argument %qD doesn%'t match "
8055 "built-in prototype", parm);
8058 error_at (DECL_SOURCE_LOCATION (parm),
8059 "argument %qD doesn%'t match prototype", parm);
8060 error_at (current_function_prototype_locus,
8061 "prototype declaration");
8066 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
8069 /* Otherwise, create a prototype that would match. */
8073 tree actual = 0, last = 0, type;
8075 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm))
8077 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
8079 TREE_CHAIN (last) = type;
8084 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
8086 TREE_CHAIN (last) = type;
8090 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8091 of the type of this function, but we need to avoid having this
8092 affect the types of other similarly-typed functions, so we must
8093 first force the generation of an identical (but separate) type
8094 node for the relevant function type. The new node we create
8095 will be a variant of the main variant of the original function
8098 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
8100 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
8104 /* Store parameter declarations passed in ARG_INFO into the current
8105 function declaration. */
8108 store_parm_decls_from (struct c_arg_info *arg_info)
8110 current_function_arg_info = arg_info;
8111 store_parm_decls ();
8114 /* Store the parameter declarations into the current function declaration.
8115 This is called after parsing the parameter declarations, before
8116 digesting the body of the function.
8118 For an old-style definition, construct a prototype out of the old-style
8119 parameter declarations and inject it into the function's type. */
8122 store_parm_decls (void)
8124 tree fndecl = current_function_decl;
8127 /* The argument information block for FNDECL. */
8128 struct c_arg_info *arg_info = current_function_arg_info;
8129 current_function_arg_info = 0;
8131 /* True if this definition is written with a prototype. Note:
8132 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8133 list in a function definition as equivalent to (void) -- an
8134 empty argument list specifies the function has no parameters,
8135 but only (void) sets up a prototype for future calls. */
8136 proto = arg_info->types != 0;
8139 store_parm_decls_newstyle (fndecl, arg_info);
8141 store_parm_decls_oldstyle (fndecl, arg_info);
8143 /* The next call to push_scope will be a function body. */
8145 next_is_function_body = true;
8147 /* Write a record describing this function definition to the prototypes
8148 file (if requested). */
8150 gen_aux_info_record (fndecl, 1, 0, proto);
8152 /* Initialize the RTL code for the function. */
8153 allocate_struct_function (fndecl, false);
8155 /* Begin the statement tree for this function. */
8156 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
8158 /* ??? Insert the contents of the pending sizes list into the function
8159 to be evaluated. The only reason left to have this is
8160 void foo(int n, int array[n++])
8161 because we throw away the array type in favor of a pointer type, and
8162 thus won't naturally see the SAVE_EXPR containing the increment. All
8163 other pending sizes would be handled by gimplify_parameters. */
8165 VEC(tree,gc) *pending_sizes = get_pending_sizes ();
8169 FOR_EACH_VEC_ELT (tree, pending_sizes, i, t)
8173 /* Even though we're inside a function body, we still don't want to
8174 call expand_expr to calculate the size of a variable-sized array.
8175 We haven't necessarily assigned RTL to all variables yet, so it's
8176 not safe to try to expand expressions involving them. */
8177 cfun->dont_save_pending_sizes_p = 1;
8181 /* Finish up a function declaration and compile that function
8182 all the way to assembler language output. Then free the storage
8183 for the function definition.
8185 This is called after parsing the body of the function definition. */
8188 finish_function (void)
8190 tree fndecl = current_function_decl;
8192 if (c_dialect_objc ())
8193 objc_finish_function ();
8195 if (TREE_CODE (fndecl) == FUNCTION_DECL
8196 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
8198 tree args = DECL_ARGUMENTS (fndecl);
8199 for (; args; args = DECL_CHAIN (args))
8201 tree type = TREE_TYPE (args);
8202 if (INTEGRAL_TYPE_P (type)
8203 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
8204 DECL_ARG_TYPE (args) = integer_type_node;
8208 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
8209 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
8211 /* Must mark the RESULT_DECL as being in this function. */
8213 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
8214 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
8216 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
8217 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
8218 == integer_type_node && flag_isoc99)
8220 /* Hack. We don't want the middle-end to warn that this return
8221 is unreachable, so we mark its location as special. Using
8222 UNKNOWN_LOCATION has the problem that it gets clobbered in
8223 annotate_one_with_locus. A cleaner solution might be to
8224 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8226 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
8229 /* Tie off the statement tree for this function. */
8230 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
8232 finish_fname_decls ();
8234 /* Complain if there's just no return statement. */
8235 if (warn_return_type
8236 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
8237 && !current_function_returns_value && !current_function_returns_null
8238 /* Don't complain if we are no-return. */
8239 && !current_function_returns_abnormally
8240 /* Don't complain if we are declared noreturn. */
8241 && !TREE_THIS_VOLATILE (fndecl)
8242 /* Don't warn for main(). */
8243 && !MAIN_NAME_P (DECL_NAME (fndecl))
8244 /* Or if they didn't actually specify a return type. */
8245 && !C_FUNCTION_IMPLICIT_INT (fndecl)
8246 /* Normally, with -Wreturn-type, flow will complain, but we might
8247 optimize out static functions. */
8248 && !TREE_PUBLIC (fndecl))
8250 warning (OPT_Wreturn_type,
8251 "no return statement in function returning non-void");
8252 TREE_NO_WARNING (fndecl) = 1;
8255 /* Complain about parameters that are only set, but never otherwise used. */
8256 if (warn_unused_but_set_parameter)
8260 for (decl = DECL_ARGUMENTS (fndecl);
8262 decl = DECL_CHAIN (decl))
8263 if (TREE_USED (decl)
8264 && TREE_CODE (decl) == PARM_DECL
8265 && !DECL_READ_P (decl)
8267 && !DECL_ARTIFICIAL (decl)
8268 && !TREE_NO_WARNING (decl))
8269 warning_at (DECL_SOURCE_LOCATION (decl),
8270 OPT_Wunused_but_set_parameter,
8271 "parameter %qD set but not used", decl);
8274 /* Store the end of the function, so that we get good line number
8275 info for the epilogue. */
8276 cfun->function_end_locus = input_location;
8278 /* Finalize the ELF visibility for the function. */
8279 c_determine_visibility (fndecl);
8281 /* For GNU C extern inline functions disregard inline limits. */
8282 if (DECL_EXTERNAL (fndecl)
8283 && DECL_DECLARED_INLINE_P (fndecl))
8284 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
8286 /* Genericize before inlining. Delay genericizing nested functions
8287 until their parent function is genericized. Since finalizing
8288 requires GENERIC, delay that as well. */
8290 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
8291 && !undef_nested_function)
8293 if (!decl_function_context (fndecl))
8295 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
8296 c_genericize (fndecl);
8298 /* ??? Objc emits functions after finalizing the compilation unit.
8299 This should be cleaned up later and this conditional removed. */
8300 if (cgraph_global_info_ready)
8302 cgraph_add_new_function (fndecl, false);
8305 cgraph_finalize_function (fndecl, false);
8309 /* Register this function with cgraph just far enough to get it
8310 added to our parent's nested function list. Handy, since the
8311 C front end doesn't have such a list. */
8312 (void) cgraph_node (fndecl);
8316 if (!decl_function_context (fndecl))
8317 undef_nested_function = false;
8319 /* We're leaving the context of this function, so zap cfun.
8320 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8321 tree_rest_of_compilation. */
8323 current_function_decl = NULL;
8326 /* Check the declarations given in a for-loop for satisfying the C99
8327 constraints. If exactly one such decl is found, return it. LOC is
8328 the location of the opening parenthesis of the for loop. The last
8329 parameter allows you to control the "for loop initial declarations
8330 are only allowed in C99 mode". Normally, you should pass
8331 flag_isoc99 as that parameter. But in some cases (Objective-C
8332 foreach loop, for example) we want to run the checks in this
8333 function even if not in C99 mode, so we allow the caller to turn
8334 off the error about not being in C99 mode.
8338 check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error)
8340 struct c_binding *b;
8341 tree one_decl = NULL_TREE;
8344 if (!turn_off_iso_c99_error)
8346 static bool hint = true;
8347 /* If we get here, declarations have been used in a for loop without
8348 the C99 for loop scope. This doesn't make much sense, so don't
8350 error_at (loc, "%<for%> loop initial declarations "
8351 "are only allowed in C99 mode");
8355 "use option -std=c99 or -std=gnu99 to compile your code");
8360 /* C99 subclause 6.8.5 paragraph 3:
8362 [#3] The declaration part of a for statement shall only
8363 declare identifiers for objects having storage class auto or
8366 It isn't clear whether, in this sentence, "identifiers" binds to
8367 "shall only declare" or to "objects" - that is, whether all identifiers
8368 declared must be identifiers for objects, or whether the restriction
8369 only applies to those that are. (A question on this in comp.std.c
8370 in November 2000 received no answer.) We implement the strictest
8371 interpretation, to avoid creating an extension which later causes
8374 for (b = current_scope->bindings; b; b = b->prev)
8377 tree decl = b->decl;
8382 switch (TREE_CODE (decl))
8386 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
8387 if (TREE_STATIC (decl))
8389 "declaration of static variable %qD in %<for%> loop "
8390 "initial declaration", decl);
8391 else if (DECL_EXTERNAL (decl))
8393 "declaration of %<extern%> variable %qD in %<for%> loop "
8394 "initial declaration", decl);
8400 "%<struct %E%> declared in %<for%> loop initial "
8405 "%<union %E%> declared in %<for%> loop initial declaration",
8409 error_at (loc, "%<enum %E%> declared in %<for%> loop "
8410 "initial declaration", id);
8413 error_at (loc, "declaration of non-variable "
8414 "%qD in %<for%> loop initial declaration", decl);
8421 return n_decls == 1 ? one_decl : NULL_TREE;
8424 /* Save and reinitialize the variables
8425 used during compilation of a C function. */
8428 c_push_function_context (void)
8430 struct language_function *p;
8431 p = ggc_alloc_language_function ();
8434 p->base.x_stmt_tree = c_stmt_tree;
8435 p->x_break_label = c_break_label;
8436 p->x_cont_label = c_cont_label;
8437 p->x_switch_stack = c_switch_stack;
8438 p->arg_info = current_function_arg_info;
8439 p->returns_value = current_function_returns_value;
8440 p->returns_null = current_function_returns_null;
8441 p->returns_abnormally = current_function_returns_abnormally;
8442 p->warn_about_return_type = warn_about_return_type;
8444 push_function_context ();
8447 /* Restore the variables used during compilation of a C function. */
8450 c_pop_function_context (void)
8452 struct language_function *p;
8454 pop_function_context ();
8456 cfun->language = NULL;
8458 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
8459 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
8461 /* Stop pointing to the local nodes about to be freed. */
8462 /* But DECL_INITIAL must remain nonzero so we know this
8463 was an actual function definition. */
8464 DECL_INITIAL (current_function_decl) = error_mark_node;
8465 DECL_ARGUMENTS (current_function_decl) = 0;
8468 c_stmt_tree = p->base.x_stmt_tree;
8469 c_break_label = p->x_break_label;
8470 c_cont_label = p->x_cont_label;
8471 c_switch_stack = p->x_switch_stack;
8472 current_function_arg_info = p->arg_info;
8473 current_function_returns_value = p->returns_value;
8474 current_function_returns_null = p->returns_null;
8475 current_function_returns_abnormally = p->returns_abnormally;
8476 warn_about_return_type = p->warn_about_return_type;
8479 /* The functions below are required for functionality of doing
8480 function at once processing in the C front end. Currently these
8481 functions are not called from anywhere in the C front end, but as
8482 these changes continue, that will change. */
8484 /* Returns the stmt_tree (if any) to which statements are currently
8485 being added. If there is no active statement-tree, NULL is
8489 current_stmt_tree (void)
8491 return &c_stmt_tree;
8494 /* Return the global value of T as a symbol. */
8497 identifier_global_value (tree t)
8499 struct c_binding *b;
8501 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
8502 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
8508 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8509 otherwise the name is found in ridpointers from RID_INDEX. */
8512 record_builtin_type (enum rid rid_index, const char *name, tree type)
8516 id = ridpointers[(int) rid_index];
8518 id = get_identifier (name);
8519 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
8521 if (debug_hooks->type_decl)
8522 debug_hooks->type_decl (decl, false);
8525 /* Build the void_list_node (void_type_node having been created). */
8527 build_void_list_node (void)
8529 tree t = build_tree_list (NULL_TREE, void_type_node);
8533 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8536 build_c_parm (struct c_declspecs *specs, tree attrs,
8537 struct c_declarator *declarator)
8539 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
8542 ret->declarator = declarator;
8546 /* Return a declarator with nested attributes. TARGET is the inner
8547 declarator to which these attributes apply. ATTRS are the
8550 struct c_declarator *
8551 build_attrs_declarator (tree attrs, struct c_declarator *target)
8553 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8554 ret->kind = cdk_attrs;
8555 ret->declarator = target;
8556 ret->u.attrs = attrs;
8560 /* Return a declarator for a function with arguments specified by ARGS
8561 and return type specified by TARGET. */
8563 struct c_declarator *
8564 build_function_declarator (struct c_arg_info *args,
8565 struct c_declarator *target)
8567 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8568 ret->kind = cdk_function;
8569 ret->declarator = target;
8570 ret->u.arg_info = args;
8574 /* Return a declarator for the identifier IDENT (which may be
8575 NULL_TREE for an abstract declarator). */
8577 struct c_declarator *
8578 build_id_declarator (tree ident)
8580 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8582 ret->declarator = 0;
8584 /* Default value - may get reset to a more precise location. */
8585 ret->id_loc = input_location;
8589 /* Return something to represent absolute declarators containing a *.
8590 TARGET is the absolute declarator that the * contains.
8591 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8592 to apply to the pointer type. */
8594 struct c_declarator *
8595 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
8596 struct c_declarator *target)
8600 struct c_declarator *itarget = target;
8601 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8602 if (type_quals_attrs)
8604 attrs = type_quals_attrs->attrs;
8605 quals = quals_from_declspecs (type_quals_attrs);
8606 if (attrs != NULL_TREE)
8607 itarget = build_attrs_declarator (attrs, target);
8609 ret->kind = cdk_pointer;
8610 ret->declarator = itarget;
8611 ret->u.pointer_quals = quals;
8615 /* Return a pointer to a structure for an empty list of declaration
8618 struct c_declspecs *
8619 build_null_declspecs (void)
8621 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
8626 ret->typespec_word = cts_none;
8627 ret->storage_class = csc_none;
8628 ret->expr_const_operands = true;
8629 ret->declspecs_seen_p = false;
8630 ret->typespec_kind = ctsk_none;
8631 ret->non_sc_seen_p = false;
8632 ret->typedef_p = false;
8633 ret->explicit_signed_p = false;
8634 ret->deprecated_p = false;
8635 ret->default_int_p = false;
8636 ret->long_p = false;
8637 ret->long_long_p = false;
8638 ret->short_p = false;
8639 ret->signed_p = false;
8640 ret->unsigned_p = false;
8641 ret->complex_p = false;
8642 ret->inline_p = false;
8643 ret->thread_p = false;
8644 ret->const_p = false;
8645 ret->volatile_p = false;
8646 ret->restrict_p = false;
8647 ret->saturating_p = false;
8648 ret->address_space = ADDR_SPACE_GENERIC;
8652 /* Add the address space ADDRSPACE to the declaration specifiers
8653 SPECS, returning SPECS. */
8655 struct c_declspecs *
8656 declspecs_add_addrspace (struct c_declspecs *specs, addr_space_t as)
8658 specs->non_sc_seen_p = true;
8659 specs->declspecs_seen_p = true;
8661 if (!ADDR_SPACE_GENERIC_P (specs->address_space)
8662 && specs->address_space != as)
8663 error ("incompatible address space qualifiers %qs and %qs",
8664 c_addr_space_name (as),
8665 c_addr_space_name (specs->address_space));
8667 specs->address_space = as;
8671 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8674 struct c_declspecs *
8675 declspecs_add_qual (struct c_declspecs *specs, tree qual)
8679 specs->non_sc_seen_p = true;
8680 specs->declspecs_seen_p = true;
8681 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
8682 && C_IS_RESERVED_WORD (qual));
8683 i = C_RID_CODE (qual);
8687 dupe = specs->const_p;
8688 specs->const_p = true;
8691 dupe = specs->volatile_p;
8692 specs->volatile_p = true;
8695 dupe = specs->restrict_p;
8696 specs->restrict_p = true;
8701 if (dupe && !flag_isoc99)
8702 pedwarn (input_location, OPT_pedantic, "duplicate %qE", qual);
8706 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8709 struct c_declspecs *
8710 declspecs_add_type (location_t loc, struct c_declspecs *specs,
8711 struct c_typespec spec)
8713 tree type = spec.spec;
8714 specs->non_sc_seen_p = true;
8715 specs->declspecs_seen_p = true;
8716 specs->typespec_kind = spec.kind;
8717 if (TREE_DEPRECATED (type))
8718 specs->deprecated_p = true;
8720 /* Handle type specifier keywords. */
8721 if (TREE_CODE (type) == IDENTIFIER_NODE
8722 && C_IS_RESERVED_WORD (type)
8723 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
8725 enum rid i = C_RID_CODE (type);
8728 error_at (loc, "two or more data types in declaration specifiers");
8731 if ((int) i <= (int) RID_LAST_MODIFIER)
8733 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8738 if (specs->long_long_p)
8740 error_at (loc, "%<long long long%> is too long for GCC");
8745 if (specs->typespec_word == cts_double)
8748 ("both %<long long%> and %<double%> in "
8749 "declaration specifiers"));
8752 pedwarn_c90 (loc, OPT_Wlong_long,
8753 "ISO C90 does not support %<long long%>");
8754 specs->long_long_p = 1;
8759 ("both %<long%> and %<short%> in "
8760 "declaration specifiers"));
8761 else if (specs->typespec_word == cts_void)
8763 ("both %<long%> and %<void%> in "
8764 "declaration specifiers"));
8765 else if (specs->typespec_word == cts_int128)
8767 ("both %<long%> and %<__int128%> in "
8768 "declaration specifiers"));
8769 else if (specs->typespec_word == cts_bool)
8771 ("both %<long%> and %<_Bool%> in "
8772 "declaration specifiers"));
8773 else if (specs->typespec_word == cts_char)
8775 ("both %<long%> and %<char%> in "
8776 "declaration specifiers"));
8777 else if (specs->typespec_word == cts_float)
8779 ("both %<long%> and %<float%> in "
8780 "declaration specifiers"));
8781 else if (specs->typespec_word == cts_dfloat32)
8783 ("both %<long%> and %<_Decimal32%> in "
8784 "declaration specifiers"));
8785 else if (specs->typespec_word == cts_dfloat64)
8787 ("both %<long%> and %<_Decimal64%> in "
8788 "declaration specifiers"));
8789 else if (specs->typespec_word == cts_dfloat128)
8791 ("both %<long%> and %<_Decimal128%> in "
8792 "declaration specifiers"));
8794 specs->long_p = true;
8797 dupe = specs->short_p;
8800 ("both %<long%> and %<short%> in "
8801 "declaration specifiers"));
8802 else if (specs->typespec_word == cts_void)
8804 ("both %<short%> and %<void%> in "
8805 "declaration specifiers"));
8806 else if (specs->typespec_word == cts_int128)
8808 ("both %<short%> and %<__int128%> in "
8809 "declaration specifiers"));
8810 else if (specs->typespec_word == cts_bool)
8812 ("both %<short%> and %<_Bool%> in "
8813 "declaration specifiers"));
8814 else if (specs->typespec_word == cts_char)
8816 ("both %<short%> and %<char%> in "
8817 "declaration specifiers"));
8818 else if (specs->typespec_word == cts_float)
8820 ("both %<short%> and %<float%> in "
8821 "declaration specifiers"));
8822 else if (specs->typespec_word == cts_double)
8824 ("both %<short%> and %<double%> in "
8825 "declaration specifiers"));
8826 else if (specs->typespec_word == cts_dfloat32)
8828 ("both %<short%> and %<_Decimal32%> in "
8829 "declaration specifiers"));
8830 else if (specs->typespec_word == cts_dfloat64)
8832 ("both %<short%> and %<_Decimal64%> in "
8833 "declaration specifiers"));
8834 else if (specs->typespec_word == cts_dfloat128)
8836 ("both %<short%> and %<_Decimal128%> in "
8837 "declaration specifiers"));
8839 specs->short_p = true;
8842 dupe = specs->signed_p;
8843 if (specs->unsigned_p)
8845 ("both %<signed%> and %<unsigned%> in "
8846 "declaration specifiers"));
8847 else if (specs->typespec_word == cts_void)
8849 ("both %<signed%> and %<void%> in "
8850 "declaration specifiers"));
8851 else if (specs->typespec_word == cts_bool)
8853 ("both %<signed%> and %<_Bool%> in "
8854 "declaration specifiers"));
8855 else if (specs->typespec_word == cts_float)
8857 ("both %<signed%> and %<float%> in "
8858 "declaration specifiers"));
8859 else if (specs->typespec_word == cts_double)
8861 ("both %<signed%> and %<double%> in "
8862 "declaration specifiers"));
8863 else if (specs->typespec_word == cts_dfloat32)
8865 ("both %<signed%> and %<_Decimal32%> in "
8866 "declaration specifiers"));
8867 else if (specs->typespec_word == cts_dfloat64)
8869 ("both %<signed%> and %<_Decimal64%> in "
8870 "declaration specifiers"));
8871 else if (specs->typespec_word == cts_dfloat128)
8873 ("both %<signed%> and %<_Decimal128%> in "
8874 "declaration specifiers"));
8876 specs->signed_p = true;
8879 dupe = specs->unsigned_p;
8880 if (specs->signed_p)
8882 ("both %<signed%> and %<unsigned%> in "
8883 "declaration specifiers"));
8884 else if (specs->typespec_word == cts_void)
8886 ("both %<unsigned%> and %<void%> in "
8887 "declaration specifiers"));
8888 else if (specs->typespec_word == cts_bool)
8890 ("both %<unsigned%> and %<_Bool%> in "
8891 "declaration specifiers"));
8892 else if (specs->typespec_word == cts_float)
8894 ("both %<unsigned%> and %<float%> in "
8895 "declaration specifiers"));
8896 else if (specs->typespec_word == cts_double)
8898 ("both %<unsigned%> and %<double%> in "
8899 "declaration specifiers"));
8900 else if (specs->typespec_word == cts_dfloat32)
8902 ("both %<unsigned%> and %<_Decimal32%> in "
8903 "declaration specifiers"));
8904 else if (specs->typespec_word == cts_dfloat64)
8906 ("both %<unsigned%> and %<_Decimal64%> in "
8907 "declaration specifiers"));
8908 else if (specs->typespec_word == cts_dfloat128)
8910 ("both %<unsigned%> and %<_Decimal128%> in "
8911 "declaration specifiers"));
8913 specs->unsigned_p = true;
8916 dupe = specs->complex_p;
8917 if (!flag_isoc99 && !in_system_header)
8918 pedwarn (loc, OPT_pedantic,
8919 "ISO C90 does not support complex types");
8920 if (specs->typespec_word == cts_void)
8922 ("both %<complex%> and %<void%> in "
8923 "declaration specifiers"));
8924 else if (specs->typespec_word == cts_bool)
8926 ("both %<complex%> and %<_Bool%> in "
8927 "declaration specifiers"));
8928 else if (specs->typespec_word == cts_dfloat32)
8930 ("both %<complex%> and %<_Decimal32%> in "
8931 "declaration specifiers"));
8932 else if (specs->typespec_word == cts_dfloat64)
8934 ("both %<complex%> and %<_Decimal64%> in "
8935 "declaration specifiers"));
8936 else if (specs->typespec_word == cts_dfloat128)
8938 ("both %<complex%> and %<_Decimal128%> in "
8939 "declaration specifiers"));
8940 else if (specs->typespec_word == cts_fract)
8942 ("both %<complex%> and %<_Fract%> in "
8943 "declaration specifiers"));
8944 else if (specs->typespec_word == cts_accum)
8946 ("both %<complex%> and %<_Accum%> in "
8947 "declaration specifiers"));
8948 else if (specs->saturating_p)
8950 ("both %<complex%> and %<_Sat%> in "
8951 "declaration specifiers"));
8953 specs->complex_p = true;
8956 dupe = specs->saturating_p;
8957 pedwarn (loc, OPT_pedantic,
8958 "ISO C does not support saturating types");
8959 if (specs->typespec_word == cts_int128)
8962 ("both %<_Sat%> and %<__int128%> in "
8963 "declaration specifiers"));
8965 else if (specs->typespec_word == cts_void)
8967 ("both %<_Sat%> and %<void%> in "
8968 "declaration specifiers"));
8969 else if (specs->typespec_word == cts_bool)
8971 ("both %<_Sat%> and %<_Bool%> in "
8972 "declaration specifiers"));
8973 else if (specs->typespec_word == cts_char)
8975 ("both %<_Sat%> and %<char%> in "
8976 "declaration specifiers"));
8977 else if (specs->typespec_word == cts_int)
8979 ("both %<_Sat%> and %<int%> in "
8980 "declaration specifiers"));
8981 else if (specs->typespec_word == cts_float)
8983 ("both %<_Sat%> and %<float%> in "
8984 "declaration specifiers"));
8985 else if (specs->typespec_word == cts_double)
8987 ("both %<_Sat%> and %<double%> in "
8988 "declaration specifiers"));
8989 else if (specs->typespec_word == cts_dfloat32)
8991 ("both %<_Sat%> and %<_Decimal32%> in "
8992 "declaration specifiers"));
8993 else if (specs->typespec_word == cts_dfloat64)
8995 ("both %<_Sat%> and %<_Decimal64%> in "
8996 "declaration specifiers"));
8997 else if (specs->typespec_word == cts_dfloat128)
8999 ("both %<_Sat%> and %<_Decimal128%> in "
9000 "declaration specifiers"));
9001 else if (specs->complex_p)
9003 ("both %<_Sat%> and %<complex%> in "
9004 "declaration specifiers"));
9006 specs->saturating_p = true;
9013 error_at (loc, "duplicate %qE", type);
9019 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9020 "__int128", "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
9021 if (specs->typespec_word != cts_none)
9024 "two or more data types in declaration specifiers");
9030 if (int128_integer_type_node == NULL_TREE)
9032 error_at (loc, "%<__int128%> is not supported for this target");
9035 if (!in_system_header)
9036 pedwarn (loc, OPT_pedantic,
9037 "ISO C does not support %<__int128%> type");
9041 ("both %<__int128%> and %<long%> in "
9042 "declaration specifiers"));
9043 else if (specs->saturating_p)
9045 ("both %<_Sat%> and %<__int128%> in "
9046 "declaration specifiers"));
9047 else if (specs->short_p)
9049 ("both %<__int128%> and %<short%> in "
9050 "declaration specifiers"));
9052 specs->typespec_word = cts_int128;
9057 ("both %<long%> and %<void%> in "
9058 "declaration specifiers"));
9059 else if (specs->short_p)
9061 ("both %<short%> and %<void%> in "
9062 "declaration specifiers"));
9063 else if (specs->signed_p)
9065 ("both %<signed%> and %<void%> in "
9066 "declaration specifiers"));
9067 else if (specs->unsigned_p)
9069 ("both %<unsigned%> and %<void%> in "
9070 "declaration specifiers"));
9071 else if (specs->complex_p)
9073 ("both %<complex%> and %<void%> in "
9074 "declaration specifiers"));
9075 else if (specs->saturating_p)
9077 ("both %<_Sat%> and %<void%> in "
9078 "declaration specifiers"));
9080 specs->typespec_word = cts_void;
9085 ("both %<long%> and %<_Bool%> in "
9086 "declaration specifiers"));
9087 else if (specs->short_p)
9089 ("both %<short%> and %<_Bool%> in "
9090 "declaration specifiers"));
9091 else if (specs->signed_p)
9093 ("both %<signed%> and %<_Bool%> in "
9094 "declaration specifiers"));
9095 else if (specs->unsigned_p)
9097 ("both %<unsigned%> and %<_Bool%> in "
9098 "declaration specifiers"));
9099 else if (specs->complex_p)
9101 ("both %<complex%> and %<_Bool%> in "
9102 "declaration specifiers"));
9103 else if (specs->saturating_p)
9105 ("both %<_Sat%> and %<_Bool%> in "
9106 "declaration specifiers"));
9108 specs->typespec_word = cts_bool;
9113 ("both %<long%> and %<char%> in "
9114 "declaration specifiers"));
9115 else if (specs->short_p)
9117 ("both %<short%> and %<char%> in "
9118 "declaration specifiers"));
9119 else if (specs->saturating_p)
9121 ("both %<_Sat%> and %<char%> in "
9122 "declaration specifiers"));
9124 specs->typespec_word = cts_char;
9127 if (specs->saturating_p)
9129 ("both %<_Sat%> and %<int%> in "
9130 "declaration specifiers"));
9132 specs->typespec_word = cts_int;
9137 ("both %<long%> and %<float%> in "
9138 "declaration specifiers"));
9139 else if (specs->short_p)
9141 ("both %<short%> and %<float%> in "
9142 "declaration specifiers"));
9143 else if (specs->signed_p)
9145 ("both %<signed%> and %<float%> in "
9146 "declaration specifiers"));
9147 else if (specs->unsigned_p)
9149 ("both %<unsigned%> and %<float%> in "
9150 "declaration specifiers"));
9151 else if (specs->saturating_p)
9153 ("both %<_Sat%> and %<float%> in "
9154 "declaration specifiers"));
9156 specs->typespec_word = cts_float;
9159 if (specs->long_long_p)
9161 ("both %<long long%> and %<double%> in "
9162 "declaration specifiers"));
9163 else if (specs->short_p)
9165 ("both %<short%> and %<double%> in "
9166 "declaration specifiers"));
9167 else if (specs->signed_p)
9169 ("both %<signed%> and %<double%> in "
9170 "declaration specifiers"));
9171 else if (specs->unsigned_p)
9173 ("both %<unsigned%> and %<double%> in "
9174 "declaration specifiers"));
9175 else if (specs->saturating_p)
9177 ("both %<_Sat%> and %<double%> in "
9178 "declaration specifiers"));
9180 specs->typespec_word = cts_double;
9187 if (i == RID_DFLOAT32)
9189 else if (i == RID_DFLOAT64)
9192 str = "_Decimal128";
9193 if (specs->long_long_p)
9195 ("both %<long long%> and %<%s%> in "
9196 "declaration specifiers"),
9200 ("both %<long%> and %<%s%> in "
9201 "declaration specifiers"),
9203 else if (specs->short_p)
9205 ("both %<short%> and %<%s%> in "
9206 "declaration specifiers"),
9208 else if (specs->signed_p)
9210 ("both %<signed%> and %<%s%> in "
9211 "declaration specifiers"),
9213 else if (specs->unsigned_p)
9215 ("both %<unsigned%> and %<%s%> in "
9216 "declaration specifiers"),
9218 else if (specs->complex_p)
9220 ("both %<complex%> and %<%s%> in "
9221 "declaration specifiers"),
9223 else if (specs->saturating_p)
9225 ("both %<_Sat%> and %<%s%> in "
9226 "declaration specifiers"),
9228 else if (i == RID_DFLOAT32)
9229 specs->typespec_word = cts_dfloat32;
9230 else if (i == RID_DFLOAT64)
9231 specs->typespec_word = cts_dfloat64;
9233 specs->typespec_word = cts_dfloat128;
9235 if (!targetm.decimal_float_supported_p ())
9237 ("decimal floating point not supported "
9238 "for this target"));
9239 pedwarn (loc, OPT_pedantic,
9240 "ISO C does not support decimal floating point");
9250 if (specs->complex_p)
9252 ("both %<complex%> and %<%s%> in "
9253 "declaration specifiers"),
9255 else if (i == RID_FRACT)
9256 specs->typespec_word = cts_fract;
9258 specs->typespec_word = cts_accum;
9260 if (!targetm.fixed_point_supported_p ())
9262 "fixed-point types not supported for this target");
9263 pedwarn (loc, OPT_pedantic,
9264 "ISO C does not support fixed-point types");
9267 /* ObjC reserved word "id", handled below. */
9273 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9274 form of ObjC type, cases such as "int" and "long" being handled
9275 above), a TYPE (struct, union, enum and typeof specifiers) or an
9276 ERROR_MARK. In none of these cases may there have previously
9277 been any type specifiers. */
9278 if (specs->type || specs->typespec_word != cts_none
9279 || specs->long_p || specs->short_p || specs->signed_p
9280 || specs->unsigned_p || specs->complex_p)
9281 error_at (loc, "two or more data types in declaration specifiers");
9282 else if (TREE_CODE (type) == TYPE_DECL)
9284 if (TREE_TYPE (type) == error_mark_node)
9285 ; /* Allow the type to default to int to avoid cascading errors. */
9288 specs->type = TREE_TYPE (type);
9289 specs->decl_attr = DECL_ATTRIBUTES (type);
9290 specs->typedef_p = true;
9291 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
9293 /* If this typedef name is defined in a struct, then a C++
9294 lookup would return a different value. */
9296 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
9297 warning_at (loc, OPT_Wc___compat,
9298 "C++ lookup of %qD would return a field, not a type",
9301 /* If we are parsing a struct, record that a struct field
9303 if (warn_cxx_compat && struct_parse_info != NULL)
9304 VEC_safe_push (tree, heap, struct_parse_info->typedefs_seen, type);
9307 else if (TREE_CODE (type) == IDENTIFIER_NODE)
9309 tree t = lookup_name (type);
9310 if (!t || TREE_CODE (t) != TYPE_DECL)
9311 error_at (loc, "%qE fails to be a typedef or built in type", type);
9312 else if (TREE_TYPE (t) == error_mark_node)
9315 specs->type = TREE_TYPE (t);
9317 else if (TREE_CODE (type) != ERROR_MARK)
9319 if (spec.kind == ctsk_typeof)
9321 specs->typedef_p = true;
9325 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
9326 specs->expr, spec.expr);
9328 specs->expr = spec.expr;
9329 specs->expr_const_operands &= spec.expr_const_operands;
9336 /* Set a dummy type here to avoid warning about implicit 'int'. */
9337 specs->type = integer_type_node;
9343 /* Add the storage class specifier or function specifier SCSPEC to the
9344 declaration specifiers SPECS, returning SPECS. */
9346 struct c_declspecs *
9347 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
9350 enum c_storage_class n = csc_none;
9352 specs->declspecs_seen_p = true;
9353 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
9354 && C_IS_RESERVED_WORD (scspec));
9355 i = C_RID_CODE (scspec);
9356 if (specs->non_sc_seen_p)
9357 warning (OPT_Wold_style_declaration,
9358 "%qE is not at beginning of declaration", scspec);
9362 /* C99 permits duplicate inline. Although of doubtful utility,
9363 it seems simplest to permit it in gnu89 mode as well, as
9364 there is also little utility in maintaining this as a
9365 difference between gnu89 and C99 inline. */
9367 specs->inline_p = true;
9370 dupe = specs->thread_p;
9371 if (specs->storage_class == csc_auto)
9372 error ("%<__thread%> used with %<auto%>");
9373 else if (specs->storage_class == csc_register)
9374 error ("%<__thread%> used with %<register%>");
9375 else if (specs->storage_class == csc_typedef)
9376 error ("%<__thread%> used with %<typedef%>");
9378 specs->thread_p = true;
9385 /* Diagnose "__thread extern". */
9386 if (specs->thread_p)
9387 error ("%<__thread%> before %<extern%>");
9394 /* Diagnose "__thread static". */
9395 if (specs->thread_p)
9396 error ("%<__thread%> before %<static%>");
9404 if (n != csc_none && n == specs->storage_class)
9407 error ("duplicate %qE", scspec);
9410 if (specs->storage_class != csc_none && n != specs->storage_class)
9412 error ("multiple storage classes in declaration specifiers");
9416 specs->storage_class = n;
9417 if (n != csc_extern && n != csc_static && specs->thread_p)
9419 error ("%<__thread%> used with %qE", scspec);
9420 specs->thread_p = false;
9427 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9430 struct c_declspecs *
9431 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
9433 specs->attrs = chainon (attrs, specs->attrs);
9434 specs->declspecs_seen_p = true;
9438 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9439 specifiers with any other type specifier to determine the resulting
9440 type. This is where ISO C checks on complex types are made, since
9441 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9444 struct c_declspecs *
9445 finish_declspecs (struct c_declspecs *specs)
9447 /* If a type was specified as a whole, we have no modifiers and are
9449 if (specs->type != NULL_TREE)
9451 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
9452 && !specs->signed_p && !specs->unsigned_p
9453 && !specs->complex_p);
9457 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9458 has been specified, treat it as "int" unless "_Complex" is
9459 present and there are no other specifiers. If we just have
9460 "_Complex", it is equivalent to "_Complex double", but e.g.
9461 "_Complex short" is equivalent to "_Complex short int". */
9462 if (specs->typespec_word == cts_none)
9464 if (specs->saturating_p)
9466 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9467 if (!targetm.fixed_point_supported_p ())
9468 error ("fixed-point types not supported for this target");
9469 specs->typespec_word = cts_fract;
9471 else if (specs->long_p || specs->short_p
9472 || specs->signed_p || specs->unsigned_p)
9474 specs->typespec_word = cts_int;
9476 else if (specs->complex_p)
9478 specs->typespec_word = cts_double;
9479 pedwarn (input_location, OPT_pedantic,
9480 "ISO C does not support plain %<complex%> meaning "
9481 "%<double complex%>");
9485 specs->typespec_word = cts_int;
9486 specs->default_int_p = true;
9487 /* We don't diagnose this here because grokdeclarator will
9488 give more specific diagnostics according to whether it is
9489 a function definition. */
9493 /* If "signed" was specified, record this to distinguish "int" and
9494 "signed int" in the case of a bit-field with
9495 -funsigned-bitfields. */
9496 specs->explicit_signed_p = specs->signed_p;
9498 /* Now compute the actual type. */
9499 switch (specs->typespec_word)
9502 gcc_assert (!specs->long_p && !specs->short_p
9503 && !specs->signed_p && !specs->unsigned_p
9504 && !specs->complex_p);
9505 specs->type = void_type_node;
9508 gcc_assert (!specs->long_p && !specs->short_p
9509 && !specs->signed_p && !specs->unsigned_p
9510 && !specs->complex_p);
9511 specs->type = boolean_type_node;
9514 gcc_assert (!specs->long_p && !specs->short_p);
9515 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9516 if (specs->signed_p)
9517 specs->type = signed_char_type_node;
9518 else if (specs->unsigned_p)
9519 specs->type = unsigned_char_type_node;
9521 specs->type = char_type_node;
9522 if (specs->complex_p)
9524 pedwarn (input_location, OPT_pedantic,
9525 "ISO C does not support complex integer types");
9526 specs->type = build_complex_type (specs->type);
9530 gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p);
9531 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9532 specs->type = (specs->unsigned_p
9533 ? int128_unsigned_type_node
9534 : int128_integer_type_node);
9535 if (specs->complex_p)
9537 pedwarn (input_location, OPT_pedantic,
9538 "ISO C does not support complex integer types");
9539 specs->type = build_complex_type (specs->type);
9543 gcc_assert (!(specs->long_p && specs->short_p));
9544 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9545 if (specs->long_long_p)
9546 specs->type = (specs->unsigned_p
9547 ? long_long_unsigned_type_node
9548 : long_long_integer_type_node);
9549 else if (specs->long_p)
9550 specs->type = (specs->unsigned_p
9551 ? long_unsigned_type_node
9552 : long_integer_type_node);
9553 else if (specs->short_p)
9554 specs->type = (specs->unsigned_p
9555 ? short_unsigned_type_node
9556 : short_integer_type_node);
9558 specs->type = (specs->unsigned_p
9559 ? unsigned_type_node
9560 : integer_type_node);
9561 if (specs->complex_p)
9563 pedwarn (input_location, OPT_pedantic,
9564 "ISO C does not support complex integer types");
9565 specs->type = build_complex_type (specs->type);
9569 gcc_assert (!specs->long_p && !specs->short_p
9570 && !specs->signed_p && !specs->unsigned_p);
9571 specs->type = (specs->complex_p
9572 ? complex_float_type_node
9576 gcc_assert (!specs->long_long_p && !specs->short_p
9577 && !specs->signed_p && !specs->unsigned_p);
9580 specs->type = (specs->complex_p
9581 ? complex_long_double_type_node
9582 : long_double_type_node);
9586 specs->type = (specs->complex_p
9587 ? complex_double_type_node
9588 : double_type_node);
9594 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
9595 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
9596 if (specs->typespec_word == cts_dfloat32)
9597 specs->type = dfloat32_type_node;
9598 else if (specs->typespec_word == cts_dfloat64)
9599 specs->type = dfloat64_type_node;
9601 specs->type = dfloat128_type_node;
9604 gcc_assert (!specs->complex_p);
9605 if (!targetm.fixed_point_supported_p ())
9606 specs->type = integer_type_node;
9607 else if (specs->saturating_p)
9609 if (specs->long_long_p)
9610 specs->type = specs->unsigned_p
9611 ? sat_unsigned_long_long_fract_type_node
9612 : sat_long_long_fract_type_node;
9613 else if (specs->long_p)
9614 specs->type = specs->unsigned_p
9615 ? sat_unsigned_long_fract_type_node
9616 : sat_long_fract_type_node;
9617 else if (specs->short_p)
9618 specs->type = specs->unsigned_p
9619 ? sat_unsigned_short_fract_type_node
9620 : sat_short_fract_type_node;
9622 specs->type = specs->unsigned_p
9623 ? sat_unsigned_fract_type_node
9624 : sat_fract_type_node;
9628 if (specs->long_long_p)
9629 specs->type = specs->unsigned_p
9630 ? unsigned_long_long_fract_type_node
9631 : long_long_fract_type_node;
9632 else if (specs->long_p)
9633 specs->type = specs->unsigned_p
9634 ? unsigned_long_fract_type_node
9635 : long_fract_type_node;
9636 else if (specs->short_p)
9637 specs->type = specs->unsigned_p
9638 ? unsigned_short_fract_type_node
9639 : short_fract_type_node;
9641 specs->type = specs->unsigned_p
9642 ? unsigned_fract_type_node
9647 gcc_assert (!specs->complex_p);
9648 if (!targetm.fixed_point_supported_p ())
9649 specs->type = integer_type_node;
9650 else if (specs->saturating_p)
9652 if (specs->long_long_p)
9653 specs->type = specs->unsigned_p
9654 ? sat_unsigned_long_long_accum_type_node
9655 : sat_long_long_accum_type_node;
9656 else if (specs->long_p)
9657 specs->type = specs->unsigned_p
9658 ? sat_unsigned_long_accum_type_node
9659 : sat_long_accum_type_node;
9660 else if (specs->short_p)
9661 specs->type = specs->unsigned_p
9662 ? sat_unsigned_short_accum_type_node
9663 : sat_short_accum_type_node;
9665 specs->type = specs->unsigned_p
9666 ? sat_unsigned_accum_type_node
9667 : sat_accum_type_node;
9671 if (specs->long_long_p)
9672 specs->type = specs->unsigned_p
9673 ? unsigned_long_long_accum_type_node
9674 : long_long_accum_type_node;
9675 else if (specs->long_p)
9676 specs->type = specs->unsigned_p
9677 ? unsigned_long_accum_type_node
9678 : long_accum_type_node;
9679 else if (specs->short_p)
9680 specs->type = specs->unsigned_p
9681 ? unsigned_short_accum_type_node
9682 : short_accum_type_node;
9684 specs->type = specs->unsigned_p
9685 ? unsigned_accum_type_node
9696 /* A subroutine of c_write_global_declarations. Perform final processing
9697 on one file scope's declarations (or the external scope's declarations),
9701 c_write_global_declarations_1 (tree globals)
9706 /* Process the decls in the order they were written. */
9707 for (decl = globals; decl; decl = DECL_CHAIN (decl))
9709 /* Check for used but undefined static functions using the C
9710 standard's definition of "used", and set TREE_NO_WARNING so
9711 that check_global_declarations doesn't repeat the check. */
9712 if (TREE_CODE (decl) == FUNCTION_DECL
9713 && DECL_INITIAL (decl) == 0
9714 && DECL_EXTERNAL (decl)
9715 && !TREE_PUBLIC (decl)
9716 && C_DECL_USED (decl))
9718 pedwarn (input_location, 0, "%q+F used but never defined", decl);
9719 TREE_NO_WARNING (decl) = 1;
9722 wrapup_global_declaration_1 (decl);
9728 for (decl = globals; decl; decl = DECL_CHAIN (decl))
9729 reconsider |= wrapup_global_declaration_2 (decl);
9733 for (decl = globals; decl; decl = DECL_CHAIN (decl))
9734 check_global_declaration_1 (decl);
9737 /* A subroutine of c_write_global_declarations Emit debug information for each
9738 of the declarations in GLOBALS. */
9741 c_write_global_declarations_2 (tree globals)
9745 for (decl = globals; decl ; decl = DECL_CHAIN (decl))
9746 debug_hooks->global_decl (decl);
9749 /* Callback to collect a source_ref from a DECL. */
9752 collect_source_ref_cb (tree decl)
9754 if (!DECL_IS_BUILTIN (decl))
9755 collect_source_ref (LOCATION_FILE (decl_sloc (decl, false)));
9758 /* Collect all references relevant to SOURCE_FILE. */
9761 collect_all_refs (const char *source_file)
9766 FOR_EACH_VEC_ELT (tree, all_translation_units, i, t)
9767 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file);
9770 /* Iterate over all global declarations and call CALLBACK. */
9773 for_each_global_decl (void (*callback) (tree decl))
9780 FOR_EACH_VEC_ELT (tree, all_translation_units, i, t)
9782 decls = DECL_INITIAL (t);
9783 for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl))
9788 /* Preserve the external declarations scope across a garbage collect. */
9789 static GTY(()) tree ext_block;
9792 c_write_global_declarations (void)
9797 /* We don't want to do this if generating a PCH. */
9801 /* Do the Objective-C stuff. This is where all the Objective-C
9802 module stuff gets generated (symtab, class/protocol/selector
9804 if (c_dialect_objc ())
9805 objc_write_global_declarations ();
9807 /* Close the external scope. */
9808 ext_block = pop_scope ();
9810 gcc_assert (!current_scope);
9812 /* Handle -fdump-ada-spec[-slim]. */
9813 if (dump_enabled_p (TDI_ada))
9815 /* Build a table of files to generate specs for */
9816 if (get_dump_file_info (TDI_ada)->flags & TDF_SLIM)
9817 collect_source_ref (main_input_filename);
9819 for_each_global_decl (collect_source_ref_cb);
9821 dump_ada_specs (collect_all_refs, NULL);
9826 tree tmp = BLOCK_VARS (ext_block);
9828 FILE * stream = dump_begin (TDI_tu, &flags);
9831 dump_node (tmp, flags & ~TDF_SLIM, stream);
9832 dump_end (TDI_tu, stream);
9836 /* Process all file scopes in this compilation, and the external_scope,
9837 through wrapup_global_declarations and check_global_declarations. */
9838 FOR_EACH_VEC_ELT (tree, all_translation_units, i, t)
9839 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
9840 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
9842 /* We're done parsing; proceed to optimize and emit assembly.
9843 FIXME: shouldn't be the front end's responsibility to call this. */
9844 cgraph_finalize_compilation_unit ();
9846 /* After cgraph has had a chance to emit everything that's going to
9847 be emitted, output debug information for globals. */
9850 timevar_push (TV_SYMOUT);
9851 FOR_EACH_VEC_ELT (tree, all_translation_units, i, t)
9852 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
9853 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
9854 timevar_pop (TV_SYMOUT);
9860 /* Register reserved keyword WORD as qualifier for address space AS. */
9863 c_register_addr_space (const char *word, addr_space_t as)
9865 int rid = RID_FIRST_ADDR_SPACE + as;
9868 /* Address space qualifiers are only supported
9869 in C with GNU extensions enabled. */
9870 if (c_dialect_objc () || flag_no_asm)
9873 id = get_identifier (word);
9874 C_SET_RID_CODE (id, rid);
9875 C_IS_RESERVED_WORD (id) = 1;
9876 ridpointers [rid] = id;
9879 #include "gt-c-decl.h"