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"
54 #include "langhooks.h"
55 #include "tree-mudflap.h"
57 #include "tree-iterator.h"
58 #include "diagnostic.h"
59 #include "tree-dump.h"
64 #include "langhooks-def.h"
65 #include "pointer-set.h"
69 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
71 { NORMAL, /* Ordinary declaration */
72 FUNCDEF, /* Function definition */
73 PARM, /* Declaration of parm before function body */
74 FIELD, /* Declaration inside struct or union */
75 TYPENAME}; /* Typename (inside cast or sizeof) */
77 /* States indicating how grokdeclarator() should handle declspecs marked
78 with __attribute__((deprecated)). An object declared as
79 __attribute__((deprecated)) suppresses warnings of uses of other
82 enum deprecated_states {
88 /* Nonzero if we have seen an invalid cross reference
89 to a struct, union, or enum, but not yet printed the message. */
90 tree pending_invalid_xref;
92 /* File and line to appear in the eventual error message. */
93 location_t pending_invalid_xref_location;
95 /* The file and line that the prototype came from if this is an
96 old-style definition; used for diagnostics in
97 store_parm_decls_oldstyle. */
99 static location_t current_function_prototype_locus;
101 /* Whether this prototype was built-in. */
103 static bool current_function_prototype_built_in;
105 /* The argument type information of this prototype. */
107 static tree current_function_prototype_arg_types;
109 /* The argument information structure for the function currently being
112 static struct c_arg_info *current_function_arg_info;
114 /* The obstack on which parser and related data structures, which are
115 not live beyond their top-level declaration or definition, are
117 struct obstack parser_obstack;
119 /* The current statement tree. */
121 static GTY(()) struct stmt_tree_s c_stmt_tree;
123 /* State saving variables. */
127 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
128 included in this invocation. Note that the current translation
129 unit is not included in this list. */
131 static GTY(()) tree all_translation_units;
133 /* A list of decls to be made automatically visible in each file scope. */
134 static GTY(()) tree visible_builtins;
136 /* Set to 0 at beginning of a function definition, set to 1 if
137 a return statement that specifies a return value is seen. */
139 int current_function_returns_value;
141 /* Set to 0 at beginning of a function definition, set to 1 if
142 a return statement with no argument is seen. */
144 int current_function_returns_null;
146 /* Set to 0 at beginning of a function definition, set to 1 if
147 a call to a noreturn function is seen. */
149 int current_function_returns_abnormally;
151 /* Set to nonzero by `grokdeclarator' for a function
152 whose return type is defaulted, if warnings for this are desired. */
154 static int warn_about_return_type;
156 /* Nonzero when the current toplevel function contains a declaration
157 of a nested function which is never defined. */
159 static bool undef_nested_function;
161 /* True means global_bindings_p should return false even if the scope stack
162 says we are in file scope. */
163 bool c_override_global_bindings_to_false;
166 /* Each c_binding structure describes one binding of an identifier to
167 a decl. All the decls in a scope - irrespective of namespace - are
168 chained together by the ->prev field, which (as the name implies)
169 runs in reverse order. All the decls in a given namespace bound to
170 a given identifier are chained by the ->shadowed field, which runs
171 from inner to outer scopes.
173 The ->decl field usually points to a DECL node, but there are two
174 exceptions. In the namespace of type tags, the bound entity is a
175 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
176 identifier is encountered, it is bound to error_mark_node to
177 suppress further errors about that identifier in the current
180 The ->u.type field stores the type of the declaration in this scope;
181 if NULL, the type is the type of the ->decl field. This is only of
182 relevance for objects with external or internal linkage which may
183 be redeclared in inner scopes, forming composite types that only
184 persist for the duration of those scopes. In the external scope,
185 this stores the composite of all the types declared for this
186 object, visible or not. The ->inner_comp field (used only at file
187 scope) stores whether an incomplete array type at file scope was
188 completed at an inner scope to an array size other than 1.
190 The ->u.label field is used for labels. It points to a structure
191 which stores additional information used for warnings.
193 The depth field is copied from the scope structure that holds this
194 decl. It is used to preserve the proper ordering of the ->shadowed
195 field (see bind()) and also for a handful of special-case checks.
196 Finally, the invisible bit is true for a decl which should be
197 ignored for purposes of normal name lookup, and the nested bit is
198 true for a decl that's been bound a second time in an inner scope;
199 in all such cases, the binding in the outer scope will have its
200 invisible bit true. */
202 struct GTY((chain_next ("%h.prev"))) c_binding {
203 union GTY(()) { /* first so GTY desc can use decl */
204 tree GTY((tag ("0"))) type; /* the type in this scope */
205 struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */
206 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u;
207 tree decl; /* the decl bound */
208 tree id; /* the identifier it's bound to */
209 struct c_binding *prev; /* the previous decl in this scope */
210 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
211 unsigned int depth : 28; /* depth of this scope */
212 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
213 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
214 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
215 BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */
216 location_t locus; /* location for nested bindings */
218 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
219 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
220 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
221 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
223 #define I_SYMBOL_BINDING(node) \
224 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
225 #define I_SYMBOL_DECL(node) \
226 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
228 #define I_TAG_BINDING(node) \
229 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
230 #define I_TAG_DECL(node) \
231 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
233 #define I_LABEL_BINDING(node) \
234 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
235 #define I_LABEL_DECL(node) \
236 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
238 /* Each C symbol points to three linked lists of c_binding structures.
239 These describe the values of the identifier in the three different
240 namespaces defined by the language. */
242 struct GTY(()) lang_identifier {
243 struct c_common_identifier common_id;
244 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
245 struct c_binding *tag_binding; /* struct/union/enum tags */
246 struct c_binding *label_binding; /* labels */
249 /* Validate c-lang.c's assumptions. */
250 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
251 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
253 /* The resulting tree type. */
255 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
256 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
258 union tree_node GTY ((tag ("0"),
259 desc ("tree_node_structure (&%h)")))
261 struct lang_identifier GTY ((tag ("1"))) identifier;
264 /* Track bindings and other things that matter for goto warnings. For
265 efficiency, we do not gather all the decls at the point of
266 definition. Instead, we point into the bindings structure. As
267 scopes are popped, we update these structures and gather the decls
268 that matter at that time. */
270 struct GTY(()) c_spot_bindings {
271 /* The currently open scope which holds bindings defined when the
272 label was defined or the goto statement was found. */
273 struct c_scope *scope;
274 /* The bindings in the scope field which were defined at the point
275 of the label or goto. This lets us look at older or newer
276 bindings in the scope, as appropriate. */
277 struct c_binding *bindings_in_scope;
278 /* The number of statement expressions that have started since this
279 label or goto statement was defined. This is zero if we are at
280 the same statement expression level. It is positive if we are in
281 a statement expression started since this spot. It is negative
282 if this spot was in a statement expression and we have left
285 /* Whether we started in a statement expression but are no longer in
286 it. This is set to true if stmt_exprs ever goes negative. */
290 /* This structure is used to keep track of bindings seen when a goto
291 statement is defined. This is only used if we see the goto
292 statement before we see the label. */
294 struct GTY(()) c_goto_bindings {
295 /* The location of the goto statement. */
297 /* The bindings of the goto statement. */
298 struct c_spot_bindings goto_bindings;
301 typedef struct c_goto_bindings *c_goto_bindings_p;
302 DEF_VEC_P(c_goto_bindings_p);
303 DEF_VEC_ALLOC_P(c_goto_bindings_p,gc);
305 /* The additional information we keep track of for a label binding.
306 These fields are updated as scopes are popped. */
308 struct GTY(()) c_label_vars {
309 /* The shadowed c_label_vars, when one label shadows another (which
310 can only happen using a __label__ declaration). */
311 struct c_label_vars *shadowed;
312 /* The bindings when the label was defined. */
313 struct c_spot_bindings label_bindings;
314 /* A list of decls that we care about: decls about which we should
315 warn if a goto branches to this label from later in the function.
316 Decls are added to this list as scopes are popped. We only add
317 the decls that matter. */
318 VEC(tree,gc) *decls_in_scope;
319 /* A list of goto statements to this label. This is only used for
320 goto statements seen before the label was defined, so that we can
321 issue appropriate warnings for them. */
322 VEC(c_goto_bindings_p,gc) *gotos;
325 /* Each c_scope structure describes the complete contents of one
326 scope. Four scopes are distinguished specially: the innermost or
327 current scope, the innermost function scope, the file scope (always
328 the second to outermost) and the outermost or external scope.
330 Most declarations are recorded in the current scope.
332 All normal label declarations are recorded in the innermost
333 function scope, as are bindings of undeclared identifiers to
334 error_mark_node. (GCC permits nested functions as an extension,
335 hence the 'innermost' qualifier.) Explicitly declared labels
336 (using the __label__ extension) appear in the current scope.
338 Being in the file scope (current_scope == file_scope) causes
339 special behavior in several places below. Also, under some
340 conditions the Objective-C front end records declarations in the
341 file scope even though that isn't the current scope.
343 All declarations with external linkage are recorded in the external
344 scope, even if they aren't visible there; this models the fact that
345 such declarations are visible to the entire program, and (with a
346 bit of cleverness, see pushdecl) allows diagnosis of some violations
347 of C99 6.2.2p7 and 6.2.7p2:
349 If, within the same translation unit, the same identifier appears
350 with both internal and external linkage, the behavior is
353 All declarations that refer to the same object or function shall
354 have compatible type; otherwise, the behavior is undefined.
356 Initially only the built-in declarations, which describe compiler
357 intrinsic functions plus a subset of the standard library, are in
360 The order of the blocks list matters, and it is frequently appended
361 to. To avoid having to walk all the way to the end of the list on
362 each insertion, or reverse the list later, we maintain a pointer to
363 the last list entry. (FIXME: It should be feasible to use a reversed
366 The bindings list is strictly in reverse order of declarations;
367 pop_scope relies on this. */
370 struct GTY((chain_next ("%h.outer"))) c_scope {
371 /* The scope containing this one. */
372 struct c_scope *outer;
374 /* The next outermost function scope. */
375 struct c_scope *outer_function;
377 /* All bindings in this scope. */
378 struct c_binding *bindings;
380 /* For each scope (except the global one), a chain of BLOCK nodes
381 for all the scopes that were entered and exited one level down. */
385 /* The depth of this scope. Used to keep the ->shadowed chain of
386 bindings sorted innermost to outermost. */
387 unsigned int depth : 28;
389 /* True if we are currently filling this scope with parameter
391 BOOL_BITFIELD parm_flag : 1;
393 /* True if we saw [*] in this scope. Used to give an error messages
394 if these appears in a function definition. */
395 BOOL_BITFIELD had_vla_unspec : 1;
397 /* True if we already complained about forward parameter decls
398 in this scope. This prevents double warnings on
399 foo (int a; int b; ...) */
400 BOOL_BITFIELD warned_forward_parm_decls : 1;
402 /* True if this is the outermost block scope of a function body.
403 This scope contains the parameters, the local variables declared
404 in the outermost block, and all the labels (except those in
405 nested functions, or declared at block scope with __label__). */
406 BOOL_BITFIELD function_body : 1;
408 /* True means make a BLOCK for this scope no matter what. */
409 BOOL_BITFIELD keep : 1;
411 /* True means that an unsuffixed float constant is _Decimal64. */
412 BOOL_BITFIELD float_const_decimal64 : 1;
414 /* True if this scope has any label bindings. This is used to speed
415 up searching for labels when popping scopes, particularly since
416 labels are normally only found at function scope. */
417 BOOL_BITFIELD has_label_bindings : 1;
420 /* The scope currently in effect. */
422 static GTY(()) struct c_scope *current_scope;
424 /* The innermost function scope. Ordinary (not explicitly declared)
425 labels, bindings to error_mark_node, and the lazily-created
426 bindings of __func__ and its friends get this scope. */
428 static GTY(()) struct c_scope *current_function_scope;
430 /* The C file scope. This is reset for each input translation unit. */
432 static GTY(()) struct c_scope *file_scope;
434 /* The outermost scope. This is used for all declarations with
435 external linkage, and only these, hence the name. */
437 static GTY(()) struct c_scope *external_scope;
439 /* A chain of c_scope structures awaiting reuse. */
441 static GTY((deletable)) struct c_scope *scope_freelist;
443 /* A chain of c_binding structures awaiting reuse. */
445 static GTY((deletable)) struct c_binding *binding_freelist;
447 /* Append VAR to LIST in scope SCOPE. */
448 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
449 struct c_scope *s_ = (scope); \
451 if (s_->list##_last) \
452 BLOCK_CHAIN (s_->list##_last) = d_; \
455 s_->list##_last = d_; \
458 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
459 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
460 struct c_scope *t_ = (tscope); \
461 struct c_scope *f_ = (fscope); \
463 BLOCK_CHAIN (t_->to##_last) = f_->from; \
466 t_->to##_last = f_->from##_last; \
469 /* A c_inline_static structure stores details of a static identifier
470 referenced in a definition of a function that may be an inline
471 definition if no subsequent declaration of that function uses
472 "extern" or does not use "inline". */
474 struct GTY((chain_next ("%h.next"))) c_inline_static {
475 /* The location for a diagnostic. */
478 /* The function that may be an inline definition. */
481 /* The object or function referenced. */
484 /* What sort of reference this is. */
485 enum c_inline_static_type type;
487 /* The next such structure or NULL. */
488 struct c_inline_static *next;
491 /* List of static identifiers used or referenced in functions that may
492 be inline definitions. */
493 static GTY(()) struct c_inline_static *c_inline_statics;
495 /* True means unconditionally make a BLOCK for the next scope pushed. */
497 static bool keep_next_level_flag;
499 /* True means the next call to push_scope will be the outermost scope
500 of a function body, so do not push a new scope, merely cease
501 expecting parameter decls. */
503 static bool next_is_function_body;
505 /* A VEC of pointers to c_binding structures. */
507 typedef struct c_binding *c_binding_ptr;
508 DEF_VEC_P(c_binding_ptr);
509 DEF_VEC_ALLOC_P(c_binding_ptr,heap);
511 /* Information that we keep for a struct or union while it is being
514 struct c_struct_parse_info
516 /* If warn_cxx_compat, a list of types defined within this
518 VEC(tree,heap) *struct_types;
519 /* If warn_cxx_compat, a list of field names which have bindings,
520 and which are defined in this struct, but which are not defined
521 in any enclosing struct. This is used to clear the in_struct
522 field of the c_bindings structure. */
523 VEC(c_binding_ptr,heap) *fields;
524 /* If warn_cxx_compat, a list of typedef names used when defining
525 fields in this struct. */
526 VEC(tree,heap) *typedefs_seen;
529 /* Information for the struct or union currently being parsed, or
530 NULL if not parsing a struct or union. */
531 static struct c_struct_parse_info *struct_parse_info;
533 /* Forward declarations. */
534 static tree lookup_name_in_scope (tree, struct c_scope *);
535 static tree c_make_fname_decl (location_t, tree, int);
536 static tree grokdeclarator (const struct c_declarator *,
537 struct c_declspecs *,
538 enum decl_context, bool, tree *, tree *, tree *,
539 bool *, enum deprecated_states);
540 static tree grokparms (struct c_arg_info *, bool);
541 static void layout_array_type (tree);
543 /* T is a statement. Add it to the statement-tree. This is the
544 C/ObjC version--C++ has a slightly different version of this
550 enum tree_code code = TREE_CODE (t);
552 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
554 if (!EXPR_HAS_LOCATION (t))
555 SET_EXPR_LOCATION (t, input_location);
558 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
559 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
561 /* Add T to the statement-tree. Non-side-effect statements need to be
562 recorded during statement expressions. */
563 append_to_statement_list_force (t, &cur_stmt_list);
570 c_print_identifier (FILE *file, tree node, int indent)
572 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
573 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
574 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
575 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
577 tree rid = ridpointers[C_RID_CODE (node)];
578 indent_to (file, indent + 4);
579 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
580 (void *) rid, IDENTIFIER_POINTER (rid));
584 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
585 which may be any of several kinds of DECL or TYPE or error_mark_node,
586 in the scope SCOPE. */
588 bind (tree name, tree decl, struct c_scope *scope, bool invisible,
589 bool nested, location_t locus)
591 struct c_binding *b, **here;
593 if (binding_freelist)
595 b = binding_freelist;
596 binding_freelist = b->prev;
599 b = GGC_NEW (struct c_binding);
604 b->depth = scope->depth;
605 b->invisible = invisible;
613 b->prev = scope->bindings;
619 switch (TREE_CODE (decl))
621 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
624 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
630 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
636 /* Locate the appropriate place in the chain of shadowed decls
637 to insert this binding. Normally, scope == current_scope and
638 this does nothing. */
639 while (*here && (*here)->depth > scope->depth)
640 here = &(*here)->shadowed;
646 /* Clear the binding structure B, stick it on the binding_freelist,
647 and return the former value of b->prev. This is used by pop_scope
648 and get_parm_info to iterate destructively over all the bindings
649 from a given scope. */
650 static struct c_binding *
651 free_binding_and_advance (struct c_binding *b)
653 struct c_binding *prev = b->prev;
655 memset (b, 0, sizeof (struct c_binding));
656 b->prev = binding_freelist;
657 binding_freelist = b;
662 /* Bind a label. Like bind, but skip fields which aren't used for
663 labels, and add the LABEL_VARS value. */
665 bind_label (tree name, tree label, struct c_scope *scope,
666 struct c_label_vars *label_vars)
670 bind (name, label, scope, /*invisible=*/false, /*nested=*/false,
673 scope->has_label_bindings = true;
676 gcc_assert (b->decl == label);
677 label_vars->shadowed = b->u.label;
678 b->u.label = label_vars;
681 /* Hook called at end of compilation to assume 1 elt
682 for a file-scope tentative array defn that wasn't complete before. */
685 c_finish_incomplete_decl (tree decl)
687 if (TREE_CODE (decl) == VAR_DECL)
689 tree type = TREE_TYPE (decl);
690 if (type != error_mark_node
691 && TREE_CODE (type) == ARRAY_TYPE
692 && !DECL_EXTERNAL (decl)
693 && TYPE_DOMAIN (type) == 0)
695 warning_at (DECL_SOURCE_LOCATION (decl),
696 0, "array %q+D assumed to have one element", decl);
698 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
700 layout_decl (decl, 0);
705 /* Record that inline function FUNC contains a reference (location
706 LOC) to static DECL (file-scope or function-local according to
710 record_inline_static (location_t loc, tree func, tree decl,
711 enum c_inline_static_type type)
713 struct c_inline_static *csi = GGC_NEW (struct c_inline_static);
715 csi->function = func;
716 csi->static_decl = decl;
718 csi->next = c_inline_statics;
719 c_inline_statics = csi;
722 /* Check for references to static declarations in inline functions at
723 the end of the translation unit and diagnose them if the functions
724 are still inline definitions. */
727 check_inline_statics (void)
729 struct c_inline_static *csi;
730 for (csi = c_inline_statics; csi; csi = csi->next)
732 if (DECL_EXTERNAL (csi->function))
736 pedwarn (csi->location, 0,
737 "%qD is static but used in inline function %qD "
738 "which is not static", csi->static_decl, csi->function);
741 pedwarn (csi->location, 0,
742 "%q+D is static but declared in inline function %qD "
743 "which is not static", csi->static_decl, csi->function);
749 c_inline_statics = NULL;
752 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
753 for the current state, otherwise set it to uninitialized. */
756 set_spot_bindings (struct c_spot_bindings *p, bool defining)
760 p->scope = current_scope;
761 p->bindings_in_scope = current_scope->bindings;
766 p->bindings_in_scope = NULL;
769 p->left_stmt_expr = false;
772 /* Return true if we will want to say something if a goto statement
776 decl_jump_unsafe (tree decl)
778 if (decl == error_mark_node || TREE_TYPE (decl) == error_mark_node)
781 /* Always warn about crossing variably modified types. */
782 if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == TYPE_DECL)
783 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
786 /* Otherwise, only warn if -Wgoto-misses-init and this is an
787 initialized automatic decl. */
788 if (warn_jump_misses_init
789 && TREE_CODE (decl) == VAR_DECL
790 && !TREE_STATIC (decl)
791 && DECL_INITIAL (decl) != NULL_TREE)
797 /* Update spot bindings P as we pop out of SCOPE. Return true if we
798 should push decls for a label. */
801 update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p)
803 if (p->scope != scope)
805 /* This label or goto is defined in some other scope, or it is a
806 label which is not yet defined. There is nothing to
811 /* Adjust the spot bindings to refer to the bindings already defined
812 in the enclosing scope. */
813 p->scope = scope->outer;
814 p->bindings_in_scope = p->scope->bindings;
819 /* The Objective-C front-end often needs to determine the current scope. */
822 objc_get_current_scope (void)
824 return current_scope;
827 /* The following function is used only by Objective-C. It needs to live here
828 because it accesses the innards of c_scope. */
831 objc_mark_locals_volatile (void *enclosing_blk)
833 struct c_scope *scope;
836 for (scope = current_scope;
837 scope && scope != enclosing_blk;
838 scope = scope->outer)
840 for (b = scope->bindings; b; b = b->prev)
841 objc_volatilize_decl (b->decl);
843 /* Do not climb up past the current function. */
844 if (scope->function_body)
849 /* Nonzero if we are currently in file scope. */
852 global_bindings_p (void)
854 return (current_scope == file_scope && !c_override_global_bindings_to_false
860 keep_next_level (void)
862 keep_next_level_flag = true;
865 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
868 set_float_const_decimal64 (void)
870 current_scope->float_const_decimal64 = true;
873 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
876 clear_float_const_decimal64 (void)
878 current_scope->float_const_decimal64 = false;
881 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
884 float_const_decimal64_p (void)
886 return current_scope->float_const_decimal64;
889 /* Identify this scope as currently being filled with parameters. */
892 declare_parm_level (void)
894 current_scope->parm_flag = true;
900 if (next_is_function_body)
902 /* This is the transition from the parameters to the top level
903 of the function body. These are the same scope
904 (C99 6.2.1p4,6) so we do not push another scope structure.
905 next_is_function_body is set only by store_parm_decls, which
906 in turn is called when and only when we are about to
907 encounter the opening curly brace for the function body.
909 The outermost block of a function always gets a BLOCK node,
910 because the debugging output routines expect that each
911 function has at least one BLOCK. */
912 current_scope->parm_flag = false;
913 current_scope->function_body = true;
914 current_scope->keep = true;
915 current_scope->outer_function = current_function_scope;
916 current_function_scope = current_scope;
918 keep_next_level_flag = false;
919 next_is_function_body = false;
921 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
922 if (current_scope->outer)
923 current_scope->float_const_decimal64
924 = current_scope->outer->float_const_decimal64;
926 current_scope->float_const_decimal64 = false;
930 struct c_scope *scope;
933 scope = scope_freelist;
934 scope_freelist = scope->outer;
937 scope = GGC_CNEW (struct c_scope);
939 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
941 scope->float_const_decimal64 = current_scope->float_const_decimal64;
943 scope->float_const_decimal64 = false;
945 scope->keep = keep_next_level_flag;
946 scope->outer = current_scope;
947 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
949 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
951 if (current_scope && scope->depth == 0)
954 sorry ("GCC supports only %u nested scopes", scope->depth);
957 current_scope = scope;
958 keep_next_level_flag = false;
962 /* This is called when we are leaving SCOPE. For each label defined
963 in SCOPE, add any appropriate decls to its decls_in_scope fields.
964 These are the decls whose initialization will be skipped by a goto
965 later in the function. */
968 update_label_decls (struct c_scope *scope)
975 if (s->has_label_bindings)
979 for (b = s->bindings; b != NULL; b = b->prev)
981 struct c_label_vars *label_vars;
982 struct c_binding *b1;
984 struct c_goto_bindings *g;
986 if (TREE_CODE (b->decl) != LABEL_DECL)
988 label_vars = b->u.label;
990 b1 = label_vars->label_bindings.bindings_in_scope;
991 if (update_spot_bindings (scope, &label_vars->label_bindings))
993 /* This label is defined in this scope. */
994 for (; b1 != NULL; b1 = b1->prev)
996 /* A goto from later in the function to this
997 label will never see the initialization of
998 B1, if any. Save it to issue a warning if
1000 if (decl_jump_unsafe (b1->decl))
1001 VEC_safe_push (tree, gc, label_vars->decls_in_scope,
1006 /* Update the bindings of any goto statements associated
1009 VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g);
1011 update_spot_bindings (scope, &g->goto_bindings);
1015 /* Don't search beyond the current function. */
1016 if (s == current_function_scope)
1023 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1026 set_type_context (tree type, tree context)
1028 for (type = TYPE_MAIN_VARIANT (type); type;
1029 type = TYPE_NEXT_VARIANT (type))
1030 TYPE_CONTEXT (type) = context;
1033 /* Exit a scope. Restore the state of the identifier-decl mappings
1034 that were in effect when this scope was entered. Return a BLOCK
1035 node containing all the DECLs in this scope that are of interest
1036 to debug info generation. */
1041 struct c_scope *scope = current_scope;
1042 tree block, context, p;
1043 struct c_binding *b;
1045 bool functionbody = scope->function_body;
1046 bool keep = functionbody || scope->keep || scope->bindings;
1048 update_label_decls (scope);
1050 /* If appropriate, create a BLOCK to record the decls for the life
1051 of this function. */
1055 block = make_node (BLOCK);
1056 BLOCK_SUBBLOCKS (block) = scope->blocks;
1057 TREE_USED (block) = 1;
1059 /* In each subblock, record that this is its superior. */
1060 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
1061 BLOCK_SUPERCONTEXT (p) = block;
1063 BLOCK_VARS (block) = 0;
1066 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1067 scope must be set so that they point to the appropriate
1068 construct, i.e. either to the current FUNCTION_DECL node, or
1069 else to the BLOCK node we just constructed.
1071 Note that for tagged types whose scope is just the formal
1072 parameter list for some function type specification, we can't
1073 properly set their TYPE_CONTEXTs here, because we don't have a
1074 pointer to the appropriate FUNCTION_TYPE node readily available
1075 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1076 type nodes get set in `grokdeclarator' as soon as we have created
1077 the FUNCTION_TYPE node which will represent the "scope" for these
1078 "parameter list local" tagged types. */
1079 if (scope->function_body)
1080 context = current_function_decl;
1081 else if (scope == file_scope)
1083 tree file_decl = build_decl (UNKNOWN_LOCATION,
1084 TRANSLATION_UNIT_DECL, 0, 0);
1085 TREE_CHAIN (file_decl) = all_translation_units;
1086 all_translation_units = file_decl;
1087 context = file_decl;
1092 /* Clear all bindings in this scope. */
1093 for (b = scope->bindings; b; b = free_binding_and_advance (b))
1096 switch (TREE_CODE (p))
1099 /* Warnings for unused labels, errors for undefined labels. */
1100 if (TREE_USED (p) && !DECL_INITIAL (p))
1102 error ("label %q+D used but not defined", p);
1103 DECL_INITIAL (p) = error_mark_node;
1106 warn_for_unused_label (p);
1108 /* Labels go in BLOCK_VARS. */
1109 TREE_CHAIN (p) = BLOCK_VARS (block);
1110 BLOCK_VARS (block) = p;
1111 gcc_assert (I_LABEL_BINDING (b->id) == b);
1112 I_LABEL_BINDING (b->id) = b->shadowed;
1114 /* Also pop back to the shadowed label_vars. */
1115 release_tree_vector (b->u.label->decls_in_scope);
1116 b->u.label = b->u.label->shadowed;
1122 set_type_context (p, context);
1124 /* Types may not have tag-names, in which case the type
1125 appears in the bindings list with b->id NULL. */
1128 gcc_assert (I_TAG_BINDING (b->id) == b);
1129 I_TAG_BINDING (b->id) = b->shadowed;
1134 /* Propagate TREE_ADDRESSABLE from nested functions to their
1135 containing functions. */
1136 if (!TREE_ASM_WRITTEN (p)
1137 && DECL_INITIAL (p) != 0
1138 && TREE_ADDRESSABLE (p)
1139 && DECL_ABSTRACT_ORIGIN (p) != 0
1140 && DECL_ABSTRACT_ORIGIN (p) != p)
1141 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
1142 if (!DECL_EXTERNAL (p)
1143 && !DECL_INITIAL (p)
1144 && scope != file_scope
1145 && scope != external_scope)
1147 error ("nested function %q+D declared but never defined", p);
1148 undef_nested_function = true;
1150 else if (DECL_DECLARED_INLINE_P (p)
1152 && !DECL_INITIAL (p))
1154 /* C99 6.7.4p6: "a function with external linkage... declared
1155 with an inline function specifier ... shall also be defined
1156 in the same translation unit." */
1157 if (!flag_gnu89_inline)
1158 pedwarn (input_location, 0,
1159 "inline function %q+D declared but never defined", p);
1160 DECL_EXTERNAL (p) = 1;
1166 /* Warnings for unused variables. */
1168 && !TREE_NO_WARNING (p)
1169 && !DECL_IN_SYSTEM_HEADER (p)
1171 && !DECL_ARTIFICIAL (p)
1172 && scope != file_scope
1173 && scope != external_scope)
1174 warning (OPT_Wunused_variable, "unused variable %q+D", p);
1178 error ("type of array %q+D completed incompatibly with"
1179 " implicit initialization", p);
1186 /* All of these go in BLOCK_VARS, but only if this is the
1187 binding in the home scope. */
1190 TREE_CHAIN (p) = BLOCK_VARS (block);
1191 BLOCK_VARS (block) = p;
1193 else if (VAR_OR_FUNCTION_DECL_P (p))
1195 /* For block local externs add a special
1196 DECL_EXTERNAL decl for debug info generation. */
1197 tree extp = copy_node (p);
1199 DECL_EXTERNAL (extp) = 1;
1200 TREE_STATIC (extp) = 0;
1201 TREE_PUBLIC (extp) = 1;
1202 DECL_INITIAL (extp) = NULL_TREE;
1203 DECL_LANG_SPECIFIC (extp) = NULL;
1204 DECL_CONTEXT (extp) = current_function_decl;
1205 if (TREE_CODE (p) == FUNCTION_DECL)
1207 DECL_RESULT (extp) = NULL_TREE;
1208 DECL_SAVED_TREE (extp) = NULL_TREE;
1209 DECL_STRUCT_FUNCTION (extp) = NULL;
1211 if (b->locus != UNKNOWN_LOCATION)
1212 DECL_SOURCE_LOCATION (extp) = b->locus;
1213 TREE_CHAIN (extp) = BLOCK_VARS (block);
1214 BLOCK_VARS (block) = extp;
1216 /* If this is the file scope, and we are processing more
1217 than one translation unit in this compilation, set
1218 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
1219 This makes same_translation_unit_p work, and causes
1220 static declarations to be given disambiguating suffixes. */
1221 if (scope == file_scope && num_in_fnames > 1)
1223 DECL_CONTEXT (p) = context;
1224 if (TREE_CODE (p) == TYPE_DECL)
1225 set_type_context (TREE_TYPE (p), context);
1229 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1230 already been put there by store_parm_decls. Unused-
1231 parameter warnings are handled by function.c.
1232 error_mark_node obviously does not go in BLOCK_VARS and
1233 does not get unused-variable warnings. */
1236 /* It is possible for a decl not to have a name. We get
1237 here with b->id NULL in this case. */
1240 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
1241 I_SYMBOL_BINDING (b->id) = b->shadowed;
1242 if (b->shadowed && b->shadowed->u.type)
1243 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
1253 /* Dispose of the block that we just made inside some higher level. */
1254 if ((scope->function_body || scope == file_scope) && context)
1256 DECL_INITIAL (context) = block;
1257 BLOCK_SUPERCONTEXT (block) = context;
1259 else if (scope->outer)
1262 SCOPE_LIST_APPEND (scope->outer, blocks, block);
1263 /* If we did not make a block for the scope just exited, any
1264 blocks made for inner scopes must be carried forward so they
1265 will later become subblocks of something else. */
1266 else if (scope->blocks)
1267 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
1270 /* Pop the current scope, and free the structure for reuse. */
1271 current_scope = scope->outer;
1272 if (scope->function_body)
1273 current_function_scope = scope->outer_function;
1275 memset (scope, 0, sizeof (struct c_scope));
1276 scope->outer = scope_freelist;
1277 scope_freelist = scope;
1283 push_file_scope (void)
1291 file_scope = current_scope;
1293 start_fname_decls ();
1295 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
1296 bind (DECL_NAME (decl), decl, file_scope,
1297 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl));
1301 pop_file_scope (void)
1303 /* In case there were missing closebraces, get us back to the global
1305 while (current_scope != file_scope)
1308 /* __FUNCTION__ is defined at file scope (""). This
1309 call may not be necessary as my tests indicate it
1310 still works without it. */
1311 finish_fname_decls ();
1313 check_inline_statics ();
1315 /* This is the point to write out a PCH if we're doing that.
1316 In that case we do not want to do anything else. */
1319 c_common_write_pch ();
1323 /* Pop off the file scope and close this translation unit. */
1327 maybe_apply_pending_pragma_weaks ();
1330 /* Adjust the bindings for the start of a statement expression. */
1333 c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings)
1335 struct c_scope *scope;
1337 for (scope = current_scope; scope != NULL; scope = scope->outer)
1339 struct c_binding *b;
1341 if (!scope->has_label_bindings)
1344 for (b = scope->bindings; b != NULL; b = b->prev)
1346 struct c_label_vars *label_vars;
1348 struct c_goto_bindings *g;
1350 if (TREE_CODE (b->decl) != LABEL_DECL)
1352 label_vars = b->u.label;
1353 ++label_vars->label_bindings.stmt_exprs;
1355 VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g);
1357 ++g->goto_bindings.stmt_exprs;
1361 if (switch_bindings != NULL)
1362 ++switch_bindings->stmt_exprs;
1365 /* Adjust the bindings for the end of a statement expression. */
1368 c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings)
1370 struct c_scope *scope;
1372 for (scope = current_scope; scope != NULL; scope = scope->outer)
1374 struct c_binding *b;
1376 if (!scope->has_label_bindings)
1379 for (b = scope->bindings; b != NULL; b = b->prev)
1381 struct c_label_vars *label_vars;
1383 struct c_goto_bindings *g;
1385 if (TREE_CODE (b->decl) != LABEL_DECL)
1387 label_vars = b->u.label;
1388 --label_vars->label_bindings.stmt_exprs;
1389 if (label_vars->label_bindings.stmt_exprs < 0)
1391 label_vars->label_bindings.left_stmt_expr = true;
1392 label_vars->label_bindings.stmt_exprs = 0;
1395 VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g);
1398 --g->goto_bindings.stmt_exprs;
1399 if (g->goto_bindings.stmt_exprs < 0)
1401 g->goto_bindings.left_stmt_expr = true;
1402 g->goto_bindings.stmt_exprs = 0;
1408 if (switch_bindings != NULL)
1410 --switch_bindings->stmt_exprs;
1411 gcc_assert (switch_bindings->stmt_exprs >= 0);
1415 /* Push a definition or a declaration of struct, union or enum tag "name".
1416 "type" should be the type node.
1417 We assume that the tag "name" is not already defined, and has a location
1420 Note that the definition may really be just a forward reference.
1421 In that case, the TYPE_SIZE will be zero. */
1424 pushtag (location_t loc, tree name, tree type)
1426 /* Record the identifier as the type's name if it has none. */
1427 if (name && !TYPE_NAME (type))
1428 TYPE_NAME (type) = name;
1429 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc);
1431 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1432 tagged type we just added to the current scope. This fake
1433 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1434 to output a representation of a tagged type, and it also gives
1435 us a convenient place to record the "scope start" address for the
1438 TYPE_STUB_DECL (type) = pushdecl (build_decl (loc,
1439 TYPE_DECL, NULL_TREE, type));
1441 /* An approximation for now, so we can tell this is a function-scope tag.
1442 This will be updated in pop_scope. */
1443 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1445 if (warn_cxx_compat && name != NULL_TREE)
1447 struct c_binding *b = I_SYMBOL_BINDING (name);
1450 && b->decl != NULL_TREE
1451 && TREE_CODE (b->decl) == TYPE_DECL
1452 && (B_IN_CURRENT_SCOPE (b)
1453 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
1454 && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl))
1455 != TYPE_MAIN_VARIANT (type)))
1457 warning_at (loc, OPT_Wc___compat,
1458 ("using %qD as both a typedef and a tag is "
1461 if (b->locus != UNKNOWN_LOCATION)
1462 inform (b->locus, "originally defined here");
1467 /* Subroutine of compare_decls. Allow harmless mismatches in return
1468 and argument types provided that the type modes match. This function
1469 return a unified type given a suitable match, and 0 otherwise. */
1472 match_builtin_function_types (tree newtype, tree oldtype)
1474 tree newrettype, oldrettype;
1475 tree newargs, oldargs;
1476 tree trytype, tryargs;
1478 /* Accept the return type of the new declaration if same modes. */
1479 oldrettype = TREE_TYPE (oldtype);
1480 newrettype = TREE_TYPE (newtype);
1482 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1485 oldargs = TYPE_ARG_TYPES (oldtype);
1486 newargs = TYPE_ARG_TYPES (newtype);
1489 while (oldargs || newargs)
1493 || !TREE_VALUE (oldargs)
1494 || !TREE_VALUE (newargs)
1495 || TYPE_MODE (TREE_VALUE (oldargs))
1496 != TYPE_MODE (TREE_VALUE (newargs)))
1499 oldargs = TREE_CHAIN (oldargs);
1500 newargs = TREE_CHAIN (newargs);
1503 trytype = build_function_type (newrettype, tryargs);
1504 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1507 /* Subroutine of diagnose_mismatched_decls. Check for function type
1508 mismatch involving an empty arglist vs a nonempty one and give clearer
1511 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1512 tree newtype, tree oldtype)
1516 if (TREE_CODE (olddecl) != FUNCTION_DECL
1517 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1518 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1520 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1523 t = TYPE_ARG_TYPES (oldtype);
1525 t = TYPE_ARG_TYPES (newtype);
1526 for (; t; t = TREE_CHAIN (t))
1528 tree type = TREE_VALUE (t);
1530 if (TREE_CHAIN (t) == 0
1531 && TYPE_MAIN_VARIANT (type) != void_type_node)
1533 inform (input_location, "a parameter list with an ellipsis can%'t match "
1534 "an empty parameter name list declaration");
1538 if (c_type_promotes_to (type) != type)
1540 inform (input_location, "an argument type that has a default promotion can%'t match "
1541 "an empty parameter name list declaration");
1547 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1548 old-style function definition, NEWDECL is a prototype declaration.
1549 Diagnose inconsistencies in the argument list. Returns TRUE if
1550 the prototype is compatible, FALSE if not. */
1552 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1554 tree newargs, oldargs;
1557 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1559 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1560 newargs = TYPE_ARG_TYPES (newtype);
1565 tree oldargtype = TREE_VALUE (oldargs);
1566 tree newargtype = TREE_VALUE (newargs);
1568 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1571 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1572 newargtype = TYPE_MAIN_VARIANT (newargtype);
1574 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1577 /* Reaching the end of just one list means the two decls don't
1578 agree on the number of arguments. */
1579 if (END_OF_ARGLIST (oldargtype))
1581 error ("prototype for %q+D declares more arguments "
1582 "than previous old-style definition", newdecl);
1585 else if (END_OF_ARGLIST (newargtype))
1587 error ("prototype for %q+D declares fewer arguments "
1588 "than previous old-style definition", newdecl);
1592 /* Type for passing arg must be consistent with that declared
1594 else if (!comptypes (oldargtype, newargtype))
1596 error ("prototype for %q+D declares argument %d"
1597 " with incompatible type",
1602 oldargs = TREE_CHAIN (oldargs);
1603 newargs = TREE_CHAIN (newargs);
1607 /* If we get here, no errors were found, but do issue a warning
1608 for this poor-style construct. */
1609 warning (0, "prototype for %q+D follows non-prototype definition",
1612 #undef END_OF_ARGLIST
1615 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1616 first in a pair of mismatched declarations, using the diagnostic
1619 locate_old_decl (tree decl)
1621 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1623 else if (DECL_INITIAL (decl))
1624 inform (input_location, "previous definition of %q+D was here", decl);
1625 else if (C_DECL_IMPLICIT (decl))
1626 inform (input_location, "previous implicit declaration of %q+D was here", decl);
1628 inform (input_location, "previous declaration of %q+D was here", decl);
1631 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1632 Returns true if the caller should proceed to merge the two, false
1633 if OLDDECL should simply be discarded. As a side effect, issues
1634 all necessary diagnostics for invalid or poor-style combinations.
1635 If it returns true, writes the types of NEWDECL and OLDDECL to
1636 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1637 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1640 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1641 tree *newtypep, tree *oldtypep)
1643 tree newtype, oldtype;
1644 bool pedwarned = false;
1645 bool warned = false;
1648 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1649 && DECL_EXTERNAL (DECL))
1651 /* If we have error_mark_node for either decl or type, just discard
1652 the previous decl - we're in an error cascade already. */
1653 if (olddecl == error_mark_node || newdecl == error_mark_node)
1655 *oldtypep = oldtype = TREE_TYPE (olddecl);
1656 *newtypep = newtype = TREE_TYPE (newdecl);
1657 if (oldtype == error_mark_node || newtype == error_mark_node)
1660 /* Two different categories of symbol altogether. This is an error
1661 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1662 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1664 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1665 && DECL_BUILT_IN (olddecl)
1666 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1668 error ("%q+D redeclared as different kind of symbol", newdecl);
1669 locate_old_decl (olddecl);
1671 else if (TREE_PUBLIC (newdecl))
1672 warning (0, "built-in function %q+D declared as non-function",
1675 warning (OPT_Wshadow, "declaration of %q+D shadows "
1676 "a built-in function", newdecl);
1680 /* Enumerators have no linkage, so may only be declared once in a
1682 if (TREE_CODE (olddecl) == CONST_DECL)
1684 error ("redeclaration of enumerator %q+D", newdecl);
1685 locate_old_decl (olddecl);
1689 if (!comptypes (oldtype, newtype))
1691 if (TREE_CODE (olddecl) == FUNCTION_DECL
1692 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1694 /* Accept harmless mismatch in function types.
1695 This is for the ffs and fprintf builtins. */
1696 tree trytype = match_builtin_function_types (newtype, oldtype);
1698 if (trytype && comptypes (newtype, trytype))
1699 *oldtypep = oldtype = trytype;
1702 /* If types don't match for a built-in, throw away the
1703 built-in. No point in calling locate_old_decl here, it
1704 won't print anything. */
1705 warning (0, "conflicting types for built-in function %q+D",
1710 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1711 && DECL_IS_BUILTIN (olddecl))
1713 /* A conflicting function declaration for a predeclared
1714 function that isn't actually built in. Objective C uses
1715 these. The new declaration silently overrides everything
1716 but the volatility (i.e. noreturn) indication. See also
1717 below. FIXME: Make Objective C use normal builtins. */
1718 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1721 /* Permit void foo (...) to match int foo (...) if the latter is
1722 the definition and implicit int was used. See
1723 c-torture/compile/920625-2.c. */
1724 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1725 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1726 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1727 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1729 pedwarned = pedwarn (input_location, 0,
1730 "conflicting types for %q+D", newdecl);
1731 /* Make sure we keep void as the return type. */
1732 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1733 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1735 /* Permit void foo (...) to match an earlier call to foo (...) with
1736 no declared type (thus, implicitly int). */
1737 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1738 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1739 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1740 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1742 pedwarned = pedwarn (input_location, 0,
1743 "conflicting types for %q+D", newdecl);
1744 /* Make sure we keep void as the return type. */
1745 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1749 int new_quals = TYPE_QUALS (newtype);
1750 int old_quals = TYPE_QUALS (oldtype);
1752 if (new_quals != old_quals)
1754 addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals);
1755 addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals);
1756 if (new_addr != old_addr)
1758 if (ADDR_SPACE_GENERIC_P (new_addr))
1759 error ("conflicting named address spaces (generic vs %s) "
1761 c_addr_space_name (old_addr), newdecl);
1762 else if (ADDR_SPACE_GENERIC_P (old_addr))
1763 error ("conflicting named address spaces (%s vs generic) "
1765 c_addr_space_name (new_addr), newdecl);
1767 error ("conflicting named address spaces (%s vs %s) "
1769 c_addr_space_name (new_addr),
1770 c_addr_space_name (old_addr),
1774 if (CLEAR_QUAL_ADDR_SPACE (new_quals)
1775 != CLEAR_QUAL_ADDR_SPACE (old_quals))
1776 error ("conflicting type qualifiers for %q+D", newdecl);
1779 error ("conflicting types for %q+D", newdecl);
1780 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1781 locate_old_decl (olddecl);
1786 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1787 but silently ignore the redeclaration if either is in a system
1788 header. (Conflicting redeclarations were handled above.) */
1789 if (TREE_CODE (newdecl) == TYPE_DECL)
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 error ("redefinition of typedef %q+D", newdecl);
1798 locate_old_decl (olddecl);
1802 /* Function declarations can either be 'static' or 'extern' (no
1803 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1804 can never conflict with each other on account of linkage
1805 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1806 gnu89 mode permits two definitions if one is 'extern inline' and
1807 one is not. The non- extern-inline definition supersedes the
1808 extern-inline definition. */
1810 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1812 /* If you declare a built-in function name as static, or
1813 define the built-in with an old-style definition (so we
1814 can't validate the argument list) the built-in definition is
1815 overridden, but optionally warn this was a bad choice of name. */
1816 if (DECL_BUILT_IN (olddecl)
1817 && !C_DECL_DECLARED_BUILTIN (olddecl)
1818 && (!TREE_PUBLIC (newdecl)
1819 || (DECL_INITIAL (newdecl)
1820 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1822 warning (OPT_Wshadow, "declaration of %q+D shadows "
1823 "a built-in function", newdecl);
1824 /* Discard the old built-in function. */
1828 if (DECL_INITIAL (newdecl))
1830 if (DECL_INITIAL (olddecl))
1832 /* If both decls are in the same TU and the new declaration
1833 isn't overriding an extern inline reject the new decl.
1834 In c99, no overriding is allowed in the same translation
1836 if ((!DECL_EXTERN_INLINE (olddecl)
1837 || DECL_EXTERN_INLINE (newdecl)
1838 || (!flag_gnu89_inline
1839 && (!DECL_DECLARED_INLINE_P (olddecl)
1840 || !lookup_attribute ("gnu_inline",
1841 DECL_ATTRIBUTES (olddecl)))
1842 && (!DECL_DECLARED_INLINE_P (newdecl)
1843 || !lookup_attribute ("gnu_inline",
1844 DECL_ATTRIBUTES (newdecl))))
1846 && same_translation_unit_p (newdecl, olddecl))
1848 error ("redefinition of %q+D", newdecl);
1849 locate_old_decl (olddecl);
1854 /* If we have a prototype after an old-style function definition,
1855 the argument types must be checked specially. */
1856 else if (DECL_INITIAL (olddecl)
1857 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1858 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1859 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1861 locate_old_decl (olddecl);
1864 /* A non-static declaration (even an "extern") followed by a
1865 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1866 The same is true for a static forward declaration at block
1867 scope followed by a non-static declaration/definition at file
1868 scope. Static followed by non-static at the same scope is
1869 not undefined behavior, and is the most convenient way to get
1870 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1871 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1872 we do diagnose it if -Wtraditional. */
1873 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1875 /* Two exceptions to the rule. If olddecl is an extern
1876 inline, or a predeclared function that isn't actually
1877 built in, newdecl silently overrides olddecl. The latter
1878 occur only in Objective C; see also above. (FIXME: Make
1879 Objective C use normal builtins.) */
1880 if (!DECL_IS_BUILTIN (olddecl)
1881 && !DECL_EXTERN_INLINE (olddecl))
1883 error ("static declaration of %q+D follows "
1884 "non-static declaration", newdecl);
1885 locate_old_decl (olddecl);
1889 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1891 if (DECL_CONTEXT (olddecl))
1893 error ("non-static declaration of %q+D follows "
1894 "static declaration", newdecl);
1895 locate_old_decl (olddecl);
1898 else if (warn_traditional)
1900 warned |= warning (OPT_Wtraditional,
1901 "non-static declaration of %q+D "
1902 "follows static declaration", newdecl);
1906 /* Make sure gnu_inline attribute is either not present, or
1907 present on all inline decls. */
1908 if (DECL_DECLARED_INLINE_P (olddecl)
1909 && DECL_DECLARED_INLINE_P (newdecl))
1911 bool newa = lookup_attribute ("gnu_inline",
1912 DECL_ATTRIBUTES (newdecl)) != NULL;
1913 bool olda = lookup_attribute ("gnu_inline",
1914 DECL_ATTRIBUTES (olddecl)) != NULL;
1917 error_at (input_location, "%<gnu_inline%> attribute present on %q+D",
1918 newa ? newdecl : olddecl);
1919 error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl),
1924 else if (TREE_CODE (newdecl) == VAR_DECL)
1926 /* Only variables can be thread-local, and all declarations must
1927 agree on this property. */
1928 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1930 /* Nothing to check. Since OLDDECL is marked threadprivate
1931 and NEWDECL does not have a thread-local attribute, we
1932 will merge the threadprivate attribute into NEWDECL. */
1935 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1937 if (DECL_THREAD_LOCAL_P (newdecl))
1938 error ("thread-local declaration of %q+D follows "
1939 "non-thread-local declaration", newdecl);
1941 error ("non-thread-local declaration of %q+D follows "
1942 "thread-local declaration", newdecl);
1944 locate_old_decl (olddecl);
1948 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1949 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1951 error ("redefinition of %q+D", newdecl);
1952 locate_old_decl (olddecl);
1956 /* Objects declared at file scope: if the first declaration had
1957 external linkage (even if it was an external reference) the
1958 second must have external linkage as well, or the behavior is
1959 undefined. If the first declaration had internal linkage, then
1960 the second must too, or else be an external reference (in which
1961 case the composite declaration still has internal linkage).
1962 As for function declarations, we warn about the static-then-
1963 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1964 if (DECL_FILE_SCOPE_P (newdecl)
1965 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1967 if (DECL_EXTERNAL (newdecl))
1969 if (!DECL_FILE_SCOPE_P (olddecl))
1971 error ("extern declaration of %q+D follows "
1972 "declaration with no linkage", newdecl);
1973 locate_old_decl (olddecl);
1976 else if (warn_traditional)
1978 warned |= warning (OPT_Wtraditional,
1979 "non-static declaration of %q+D "
1980 "follows static declaration", newdecl);
1985 if (TREE_PUBLIC (newdecl))
1986 error ("non-static declaration of %q+D follows "
1987 "static declaration", newdecl);
1989 error ("static declaration of %q+D follows "
1990 "non-static declaration", newdecl);
1992 locate_old_decl (olddecl);
1996 /* Two objects with the same name declared at the same block
1997 scope must both be external references (6.7p3). */
1998 else if (!DECL_FILE_SCOPE_P (newdecl))
2000 if (DECL_EXTERNAL (newdecl))
2002 /* Extern with initializer at block scope, which will
2003 already have received an error. */
2005 else if (DECL_EXTERNAL (olddecl))
2007 error ("declaration of %q+D with no linkage follows "
2008 "extern declaration", newdecl);
2009 locate_old_decl (olddecl);
2013 error ("redeclaration of %q+D with no linkage", newdecl);
2014 locate_old_decl (olddecl);
2020 /* C++ does not permit a decl to appear multiple times at file
2023 && DECL_FILE_SCOPE_P (newdecl)
2024 && !DECL_EXTERNAL (newdecl)
2025 && !DECL_EXTERNAL (olddecl))
2026 warned |= warning_at (DECL_SOURCE_LOCATION (newdecl),
2028 ("duplicate declaration of %qD is "
2034 /* All decls must agree on a visibility. */
2035 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
2036 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
2037 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2039 warned |= warning (0, "redeclaration of %q+D with different visibility "
2040 "(old visibility preserved)", newdecl);
2043 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2045 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2046 if (DECL_DECLARED_INLINE_P (newdecl)
2047 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2049 warned |= warning (OPT_Wattributes,
2050 "inline declaration of %qD follows "
2051 "declaration with attribute noinline", newdecl);
2053 else if (DECL_DECLARED_INLINE_P (olddecl)
2054 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
2056 warned |= warning (OPT_Wattributes,
2057 "declaration of %q+D with attribute "
2058 "noinline follows inline declaration ", newdecl);
2061 else /* PARM_DECL, VAR_DECL */
2063 /* Redeclaration of a parameter is a constraint violation (this is
2064 not explicitly stated, but follows from C99 6.7p3 [no more than
2065 one declaration of the same identifier with no linkage in the
2066 same scope, except type tags] and 6.2.2p6 [parameters have no
2067 linkage]). We must check for a forward parameter declaration,
2068 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2069 an extension, the mandatory diagnostic for which is handled by
2070 mark_forward_parm_decls. */
2072 if (TREE_CODE (newdecl) == PARM_DECL
2073 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
2075 error ("redefinition of parameter %q+D", newdecl);
2076 locate_old_decl (olddecl);
2081 /* Optional warning for completely redundant decls. */
2082 if (!warned && !pedwarned
2083 && warn_redundant_decls
2084 /* Don't warn about a function declaration followed by a
2086 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2087 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
2088 /* Don't warn about redundant redeclarations of builtins. */
2089 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2090 && !DECL_BUILT_IN (newdecl)
2091 && DECL_BUILT_IN (olddecl)
2092 && !C_DECL_DECLARED_BUILTIN (olddecl))
2093 /* Don't warn about an extern followed by a definition. */
2094 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
2095 /* Don't warn about forward parameter decls. */
2096 && !(TREE_CODE (newdecl) == PARM_DECL
2097 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2098 /* Don't warn about a variable definition following a declaration. */
2099 && !(TREE_CODE (newdecl) == VAR_DECL
2100 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
2102 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
2106 /* Report location of previous decl/defn. */
2107 if (warned || pedwarned)
2108 locate_old_decl (olddecl);
2110 #undef DECL_EXTERN_INLINE
2115 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2116 consistent with OLDDECL, but carries new information. Merge the
2117 new information into OLDDECL. This function issues no
2121 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
2123 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
2124 && DECL_INITIAL (newdecl) != 0);
2125 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
2126 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
2127 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
2128 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
2129 bool extern_changed = false;
2131 /* For real parm decl following a forward decl, rechain the old decl
2132 in its new location and clear TREE_ASM_WRITTEN (it's not a
2133 forward decl anymore). */
2134 if (TREE_CODE (newdecl) == PARM_DECL
2135 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2137 struct c_binding *b, **here;
2139 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
2140 if ((*here)->decl == olddecl)
2147 b->prev = current_scope->bindings;
2148 current_scope->bindings = b;
2150 TREE_ASM_WRITTEN (olddecl) = 0;
2153 DECL_ATTRIBUTES (newdecl)
2154 = targetm.merge_decl_attributes (olddecl, newdecl);
2156 /* Merge the data types specified in the two decls. */
2158 = TREE_TYPE (olddecl)
2159 = composite_type (newtype, oldtype);
2161 /* Lay the type out, unless already done. */
2162 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
2164 if (TREE_TYPE (newdecl) != error_mark_node)
2165 layout_type (TREE_TYPE (newdecl));
2166 if (TREE_CODE (newdecl) != FUNCTION_DECL
2167 && TREE_CODE (newdecl) != TYPE_DECL
2168 && TREE_CODE (newdecl) != CONST_DECL)
2169 layout_decl (newdecl, 0);
2173 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2174 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
2175 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
2176 DECL_MODE (newdecl) = DECL_MODE (olddecl);
2177 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2179 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2180 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2184 /* Keep the old rtl since we can safely use it. */
2185 if (HAS_RTL_P (olddecl))
2186 COPY_DECL_RTL (olddecl, newdecl);
2188 /* Merge the type qualifiers. */
2189 if (TREE_READONLY (newdecl))
2190 TREE_READONLY (olddecl) = 1;
2192 if (TREE_THIS_VOLATILE (newdecl))
2193 TREE_THIS_VOLATILE (olddecl) = 1;
2195 /* Merge deprecatedness. */
2196 if (TREE_DEPRECATED (newdecl))
2197 TREE_DEPRECATED (olddecl) = 1;
2199 /* If a decl is in a system header and the other isn't, keep the one on the
2200 system header. Otherwise, keep source location of definition rather than
2201 declaration and of prototype rather than non-prototype unless that
2202 prototype is built-in. */
2203 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2204 && DECL_IN_SYSTEM_HEADER (olddecl)
2205 && !DECL_IN_SYSTEM_HEADER (newdecl) )
2206 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2207 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2208 && DECL_IN_SYSTEM_HEADER (newdecl)
2209 && !DECL_IN_SYSTEM_HEADER (olddecl))
2210 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
2211 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
2212 || (old_is_prototype && !new_is_prototype
2213 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
2214 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2216 /* Merge the initialization information. */
2217 if (DECL_INITIAL (newdecl) == 0)
2218 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2220 /* Merge the threadprivate attribute. */
2221 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
2223 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
2224 C_DECL_THREADPRIVATE_P (newdecl) = 1;
2227 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
2229 /* Merge the section attribute.
2230 We want to issue an error if the sections conflict but that
2231 must be done later in decl_attributes since we are called
2232 before attributes are assigned. */
2233 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
2234 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
2236 /* Copy the assembler name.
2237 Currently, it can only be defined in the prototype. */
2238 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2240 /* Use visibility of whichever declaration had it specified */
2241 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2243 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2244 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2247 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2249 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2250 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2251 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2252 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2253 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2254 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2255 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2256 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2257 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2258 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2259 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
2262 /* Merge the storage class information. */
2263 merge_weak (newdecl, olddecl);
2265 /* For functions, static overrides non-static. */
2266 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2268 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2269 /* This is since we don't automatically
2270 copy the attributes of NEWDECL into OLDDECL. */
2271 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2272 /* If this clears `static', clear it in the identifier too. */
2273 if (!TREE_PUBLIC (olddecl))
2274 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2278 /* In c99, 'extern' declaration before (or after) 'inline' means this
2279 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2281 if (TREE_CODE (newdecl) == FUNCTION_DECL
2282 && !flag_gnu89_inline
2283 && (DECL_DECLARED_INLINE_P (newdecl)
2284 || DECL_DECLARED_INLINE_P (olddecl))
2285 && (!DECL_DECLARED_INLINE_P (newdecl)
2286 || !DECL_DECLARED_INLINE_P (olddecl)
2287 || !DECL_EXTERNAL (olddecl))
2288 && DECL_EXTERNAL (newdecl)
2289 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
2290 && !current_function_decl)
2291 DECL_EXTERNAL (newdecl) = 0;
2293 if (DECL_EXTERNAL (newdecl))
2295 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2296 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2298 /* An extern decl does not override previous storage class. */
2299 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2300 if (!DECL_EXTERNAL (newdecl))
2302 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2303 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2308 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2309 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2312 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2314 /* If we're redefining a function previously defined as extern
2315 inline, make sure we emit debug info for the inline before we
2316 throw it away, in case it was inlined into a function that
2317 hasn't been written out yet. */
2318 if (new_is_definition && DECL_INITIAL (olddecl))
2319 /* The new defn must not be inline. */
2320 DECL_UNINLINABLE (newdecl) = 1;
2323 /* If either decl says `inline', this fn is inline, unless
2324 its definition was passed already. */
2325 if (DECL_DECLARED_INLINE_P (newdecl)
2326 || DECL_DECLARED_INLINE_P (olddecl))
2327 DECL_DECLARED_INLINE_P (newdecl) = 1;
2329 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2330 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2332 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2333 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2334 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2335 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2338 if (DECL_BUILT_IN (olddecl))
2340 /* If redeclaring a builtin function, it stays built in.
2341 But it gets tagged as having been declared. */
2342 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2343 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2344 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
2345 if (new_is_prototype)
2346 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
2348 C_DECL_BUILTIN_PROTOTYPE (newdecl)
2349 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
2352 /* Preserve function specific target and optimization options */
2353 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2354 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2355 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2356 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2358 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2359 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2360 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2361 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2363 /* Also preserve various other info from the definition. */
2364 if (!new_is_definition)
2367 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2368 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2369 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2370 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2371 gimple_set_body (newdecl, gimple_body (olddecl));
2372 DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl));
2373 for (t = DECL_ARGUMENTS (newdecl); t ; t = TREE_CHAIN (t))
2374 DECL_CONTEXT (t) = newdecl;
2376 /* See if we've got a function to instantiate from. */
2377 if (DECL_SAVED_TREE (olddecl))
2378 DECL_ABSTRACT_ORIGIN (newdecl)
2379 = DECL_ABSTRACT_ORIGIN (olddecl);
2383 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
2385 /* Merge the USED information. */
2386 if (TREE_USED (olddecl))
2387 TREE_USED (newdecl) = 1;
2388 else if (TREE_USED (newdecl))
2389 TREE_USED (olddecl) = 1;
2390 if (DECL_PRESERVE_P (olddecl))
2391 DECL_PRESERVE_P (newdecl) = 1;
2392 else if (DECL_PRESERVE_P (newdecl))
2393 DECL_PRESERVE_P (olddecl) = 1;
2395 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2396 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2397 DECL_ARGUMENTS (if appropriate). */
2399 unsigned olddecl_uid = DECL_UID (olddecl);
2400 tree olddecl_context = DECL_CONTEXT (olddecl);
2401 tree olddecl_arguments = NULL;
2402 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2403 olddecl_arguments = DECL_ARGUMENTS (olddecl);
2405 memcpy ((char *) olddecl + sizeof (struct tree_common),
2406 (char *) newdecl + sizeof (struct tree_common),
2407 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2408 switch (TREE_CODE (olddecl))
2411 gimple_set_body (olddecl, gimple_body (newdecl));
2421 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2422 (char *) newdecl + sizeof (struct tree_decl_common),
2423 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2428 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2429 (char *) newdecl + sizeof (struct tree_decl_common),
2430 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
2432 DECL_UID (olddecl) = olddecl_uid;
2433 DECL_CONTEXT (olddecl) = olddecl_context;
2434 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2435 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
2438 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2439 so that encode_section_info has a chance to look at the new decl
2440 flags and attributes. */
2441 if (DECL_RTL_SET_P (olddecl)
2442 && (TREE_CODE (olddecl) == FUNCTION_DECL
2443 || (TREE_CODE (olddecl) == VAR_DECL
2444 && TREE_STATIC (olddecl))))
2445 make_decl_rtl (olddecl);
2447 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
2448 and the definition is coming from the old version, cgraph needs
2449 to be called again. */
2450 if (extern_changed && !new_is_definition
2451 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
2452 cgraph_mark_if_needed (olddecl);
2455 /* Handle when a new declaration NEWDECL has the same name as an old
2456 one OLDDECL in the same binding contour. Prints an error message
2459 If safely possible, alter OLDDECL to look like NEWDECL, and return
2460 true. Otherwise, return false. */
2463 duplicate_decls (tree newdecl, tree olddecl)
2465 tree newtype = NULL, oldtype = NULL;
2467 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
2469 /* Avoid `unused variable' and other warnings for OLDDECL. */
2470 TREE_NO_WARNING (olddecl) = 1;
2474 merge_decls (newdecl, olddecl, newtype, oldtype);
2479 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2481 warn_if_shadowing (tree new_decl)
2483 struct c_binding *b;
2485 /* Shadow warnings wanted? */
2487 /* No shadow warnings for internally generated vars. */
2488 || DECL_IS_BUILTIN (new_decl)
2489 /* No shadow warnings for vars made for inlining. */
2490 || DECL_FROM_INLINE (new_decl))
2493 /* Is anything being shadowed? Invisible decls do not count. */
2494 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
2495 if (b->decl && b->decl != new_decl && !b->invisible)
2497 tree old_decl = b->decl;
2499 if (old_decl == error_mark_node)
2501 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
2502 "non-variable", new_decl);
2505 else if (TREE_CODE (old_decl) == PARM_DECL)
2506 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
2508 else if (DECL_FILE_SCOPE_P (old_decl))
2509 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
2510 "declaration", new_decl);
2511 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2512 && DECL_BUILT_IN (old_decl))
2514 warning (OPT_Wshadow, "declaration of %q+D shadows "
2515 "a built-in function", new_decl);
2519 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
2522 warning_at (DECL_SOURCE_LOCATION (old_decl), OPT_Wshadow,
2523 "shadowed declaration is here");
2529 /* Record a decl-node X as belonging to the current lexical scope.
2530 Check for errors (such as an incompatible declaration for the same
2531 name already seen in the same scope).
2533 Returns either X or an old decl for the same name.
2534 If an old decl is returned, it may have been smashed
2535 to agree with what X says. */
2540 tree name = DECL_NAME (x);
2541 struct c_scope *scope = current_scope;
2542 struct c_binding *b;
2543 bool nested = false;
2544 location_t locus = DECL_SOURCE_LOCATION (x);
2546 /* Must set DECL_CONTEXT for everything not at file scope or
2547 DECL_FILE_SCOPE_P won't work. Local externs don't count
2548 unless they have initializers (which generate code). */
2549 if (current_function_decl
2550 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2551 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2552 DECL_CONTEXT (x) = current_function_decl;
2554 /* Anonymous decls are just inserted in the scope. */
2557 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
2562 /* First, see if there is another declaration with the same name in
2563 the current scope. If there is, duplicate_decls may do all the
2564 work for us. If duplicate_decls returns false, that indicates
2565 two incompatible decls in the same scope; we are to silently
2566 replace the old one (duplicate_decls has issued all appropriate
2567 diagnostics). In particular, we should not consider possible
2568 duplicates in the external scope, or shadowing. */
2569 b = I_SYMBOL_BINDING (name);
2570 if (b && B_IN_SCOPE (b, scope))
2572 struct c_binding *b_ext, *b_use;
2573 tree type = TREE_TYPE (x);
2574 tree visdecl = b->decl;
2575 tree vistype = TREE_TYPE (visdecl);
2576 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2577 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2578 b->inner_comp = false;
2581 /* If this is an external linkage declaration, we should check
2582 for compatibility with the type in the external scope before
2583 setting the type at this scope based on the visible
2584 information only. */
2585 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2587 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2588 b_ext = b_ext->shadowed;
2593 TREE_TYPE (b_use->decl) = b_use->u.type;
2596 if (duplicate_decls (x, b_use->decl))
2600 /* Save the updated type in the external scope and
2601 restore the proper type for this scope. */
2603 if (comptypes (vistype, type))
2604 thistype = composite_type (vistype, type);
2606 thistype = TREE_TYPE (b_use->decl);
2607 b_use->u.type = TREE_TYPE (b_use->decl);
2608 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2609 && DECL_BUILT_IN (b_use->decl))
2611 = build_type_attribute_variant (thistype,
2614 TREE_TYPE (b_use->decl) = thistype;
2619 goto skip_external_and_shadow_checks;
2622 /* All declarations with external linkage, and all external
2623 references, go in the external scope, no matter what scope is
2624 current. However, the binding in that scope is ignored for
2625 purposes of normal name lookup. A separate binding structure is
2626 created in the requested scope; this governs the normal
2627 visibility of the symbol.
2629 The binding in the externals scope is used exclusively for
2630 detecting duplicate declarations of the same object, no matter
2631 what scope they are in; this is what we do here. (C99 6.2.7p2:
2632 All declarations that refer to the same object or function shall
2633 have compatible type; otherwise, the behavior is undefined.) */
2634 if (DECL_EXTERNAL (x) || scope == file_scope)
2636 tree type = TREE_TYPE (x);
2639 bool type_saved = false;
2640 if (b && !B_IN_EXTERNAL_SCOPE (b)
2641 && (TREE_CODE (b->decl) == FUNCTION_DECL
2642 || TREE_CODE (b->decl) == VAR_DECL)
2643 && DECL_FILE_SCOPE_P (b->decl))
2646 vistype = TREE_TYPE (visdecl);
2648 if (scope != file_scope
2649 && !DECL_IN_SYSTEM_HEADER (x))
2650 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2652 while (b && !B_IN_EXTERNAL_SCOPE (b))
2654 /* If this decl might be modified, save its type. This is
2655 done here rather than when the decl is first bound
2656 because the type may change after first binding, through
2657 being completed or through attributes being added. If we
2658 encounter multiple such decls, only the first should have
2659 its type saved; the others will already have had their
2660 proper types saved and the types will not have changed as
2661 their scopes will not have been re-entered. */
2662 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2664 b->u.type = TREE_TYPE (b->decl);
2667 if (B_IN_FILE_SCOPE (b)
2668 && TREE_CODE (b->decl) == VAR_DECL
2669 && TREE_STATIC (b->decl)
2670 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2671 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2672 && TREE_CODE (type) == ARRAY_TYPE
2673 && TYPE_DOMAIN (type)
2674 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2675 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2677 /* Array type completed in inner scope, which should be
2678 diagnosed if the completion does not have size 1 and
2679 it does not get completed in the file scope. */
2680 b->inner_comp = true;
2685 /* If a matching external declaration has been found, set its
2686 type to the composite of all the types of that declaration.
2687 After the consistency checks, it will be reset to the
2688 composite of the visible types only. */
2689 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2691 TREE_TYPE (b->decl) = b->u.type;
2693 /* The point of the same_translation_unit_p check here is,
2694 we want to detect a duplicate decl for a construct like
2695 foo() { extern bar(); } ... static bar(); but not if
2696 they are in different translation units. In any case,
2697 the static does not go in the externals scope. */
2699 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2700 && duplicate_decls (x, b->decl))
2705 if (comptypes (vistype, type))
2706 thistype = composite_type (vistype, type);
2708 thistype = TREE_TYPE (b->decl);
2712 b->u.type = TREE_TYPE (b->decl);
2713 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2715 = build_type_attribute_variant (thistype,
2716 TYPE_ATTRIBUTES (b->u.type));
2717 TREE_TYPE (b->decl) = thistype;
2718 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
2722 else if (TREE_PUBLIC (x))
2724 if (visdecl && !b && duplicate_decls (x, visdecl))
2726 /* An external declaration at block scope referring to a
2727 visible entity with internal linkage. The composite
2728 type will already be correct for this scope, so we
2729 just need to fall through to make the declaration in
2736 bind (name, x, external_scope, /*invisible=*/true,
2737 /*nested=*/false, locus);
2743 if (TREE_CODE (x) != PARM_DECL)
2744 warn_if_shadowing (x);
2746 skip_external_and_shadow_checks:
2747 if (TREE_CODE (x) == TYPE_DECL)
2748 set_underlying_type (x);
2750 bind (name, x, scope, /*invisible=*/false, nested, locus);
2752 /* If x's type is incomplete because it's based on a
2753 structure or union which has not yet been fully declared,
2754 attach it to that structure or union type, so we can go
2755 back and complete the variable declaration later, if the
2756 structure or union gets fully declared.
2758 If the input is erroneous, we can have error_mark in the type
2759 slot (e.g. "f(void a, ...)") - that doesn't count as an
2761 if (TREE_TYPE (x) != error_mark_node
2762 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2764 tree element = TREE_TYPE (x);
2766 while (TREE_CODE (element) == ARRAY_TYPE)
2767 element = TREE_TYPE (element);
2768 element = TYPE_MAIN_VARIANT (element);
2770 if ((TREE_CODE (element) == RECORD_TYPE
2771 || TREE_CODE (element) == UNION_TYPE)
2772 && (TREE_CODE (x) != TYPE_DECL
2773 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2774 && !COMPLETE_TYPE_P (element))
2775 C_TYPE_INCOMPLETE_VARS (element)
2776 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2781 /* Record X as belonging to file scope.
2782 This is used only internally by the Objective-C front end,
2783 and is limited to its needs. duplicate_decls is not called;
2784 if there is any preexisting decl for this identifier, it is an ICE. */
2787 pushdecl_top_level (tree x)
2790 bool nested = false;
2791 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2793 name = DECL_NAME (x);
2795 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2797 if (TREE_PUBLIC (x))
2799 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false,
2804 bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION);
2810 implicit_decl_warning (tree id, tree olddecl)
2812 if (warn_implicit_function_declaration)
2817 warned = pedwarn (input_location, OPT_Wimplicit_function_declaration,
2818 "implicit declaration of function %qE", id);
2820 warned = warning (OPT_Wimplicit_function_declaration,
2821 G_("implicit declaration of function %qE"), id);
2822 if (olddecl && warned)
2823 locate_old_decl (olddecl);
2827 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2828 function of type int (). */
2831 implicitly_declare (location_t loc, tree functionid)
2833 struct c_binding *b;
2837 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2839 if (B_IN_SCOPE (b, external_scope))
2848 if (decl == error_mark_node)
2851 /* FIXME: Objective-C has weird not-really-builtin functions
2852 which are supposed to be visible automatically. They wind up
2853 in the external scope because they're pushed before the file
2854 scope gets created. Catch this here and rebind them into the
2856 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2858 bind (functionid, decl, file_scope,
2859 /*invisible=*/false, /*nested=*/true,
2860 DECL_SOURCE_LOCATION (decl));
2865 tree newtype = default_function_type;
2867 TREE_TYPE (decl) = b->u.type;
2868 /* Implicit declaration of a function already declared
2869 (somehow) in a different scope, or as a built-in.
2870 If this is the first time this has happened, warn;
2871 then recycle the old declaration but with the new type. */
2872 if (!C_DECL_IMPLICIT (decl))
2874 implicit_decl_warning (functionid, decl);
2875 C_DECL_IMPLICIT (decl) = 1;
2877 if (DECL_BUILT_IN (decl))
2879 newtype = build_type_attribute_variant (newtype,
2881 (TREE_TYPE (decl)));
2882 if (!comptypes (newtype, TREE_TYPE (decl)))
2884 warning_at (loc, 0, "incompatible implicit declaration of "
2885 "built-in function %qD", decl);
2886 newtype = TREE_TYPE (decl);
2891 if (!comptypes (newtype, TREE_TYPE (decl)))
2893 error_at (loc, "incompatible implicit declaration of function %qD", decl);
2894 locate_old_decl (decl);
2897 b->u.type = TREE_TYPE (decl);
2898 TREE_TYPE (decl) = newtype;
2899 bind (functionid, decl, current_scope,
2900 /*invisible=*/false, /*nested=*/true,
2901 DECL_SOURCE_LOCATION (decl));
2906 /* Not seen before. */
2907 decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type);
2908 DECL_EXTERNAL (decl) = 1;
2909 TREE_PUBLIC (decl) = 1;
2910 C_DECL_IMPLICIT (decl) = 1;
2911 implicit_decl_warning (functionid, 0);
2912 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2914 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2916 /* C89 says implicit declarations are in the innermost block.
2917 So we record the decl in the standard fashion. */
2918 decl = pushdecl (decl);
2920 /* No need to call objc_check_decl here - it's a function type. */
2921 rest_of_decl_compilation (decl, 0, 0);
2923 /* Write a record describing this implicit function declaration
2924 to the prototypes file (if requested). */
2925 gen_aux_info_record (decl, 0, 1, 0);
2927 /* Possibly apply some default attributes to this implicit declaration. */
2928 decl_attributes (&decl, NULL_TREE, 0);
2933 /* Issue an error message for a reference to an undeclared variable
2934 ID, including a reference to a builtin outside of function-call
2935 context. Establish a binding of the identifier to error_mark_node
2936 in an appropriate scope, which will suppress further errors for the
2937 same identifier. The error message should be given location LOC. */
2939 undeclared_variable (location_t loc, tree id)
2941 static bool already = false;
2942 struct c_scope *scope;
2944 if (current_function_decl == 0)
2946 error_at (loc, "%qE undeclared here (not in a function)", id);
2947 scope = current_scope;
2951 error_at (loc, "%qE undeclared (first use in this function)", id);
2955 error_at (loc, "(Each undeclared identifier is reported only once");
2956 error_at (loc, "for each function it appears in.)");
2960 /* If we are parsing old-style parameter decls, current_function_decl
2961 will be nonnull but current_function_scope will be null. */
2962 scope = current_function_scope ? current_function_scope : current_scope;
2964 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
2968 /* Subroutine of lookup_label, declare_label, define_label: construct a
2969 LABEL_DECL with all the proper frills. Also create a struct
2970 c_label_vars initialized for the current scope. */
2973 make_label (location_t location, tree name, bool defining,
2974 struct c_label_vars **p_label_vars)
2976 tree label = build_decl (location, LABEL_DECL, name, void_type_node);
2977 struct c_label_vars *label_vars;
2979 DECL_CONTEXT (label) = current_function_decl;
2980 DECL_MODE (label) = VOIDmode;
2982 label_vars = GGC_NEW (struct c_label_vars);
2983 label_vars->shadowed = NULL;
2984 set_spot_bindings (&label_vars->label_bindings, defining);
2985 label_vars->decls_in_scope = make_tree_vector ();
2986 label_vars->gotos = VEC_alloc (c_goto_bindings_p, gc, 0);
2987 *p_label_vars = label_vars;
2992 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2993 Create one if none exists so far for the current function.
2994 This is called when a label is used in a goto expression or
2995 has its address taken. */
2998 lookup_label (tree name)
3001 struct c_label_vars *label_vars;
3003 if (current_function_decl == 0)
3005 error ("label %qE referenced outside of any function", name);
3009 /* Use a label already defined or ref'd with this name, but not if
3010 it is inherited from a containing function and wasn't declared
3012 label = I_LABEL_DECL (name);
3013 if (label && (DECL_CONTEXT (label) == current_function_decl
3014 || C_DECLARED_LABEL_FLAG (label)))
3016 /* If the label has only been declared, update its apparent
3017 location to point here, for better diagnostics if it
3018 turns out not to have been defined. */
3019 if (DECL_INITIAL (label) == NULL_TREE)
3020 DECL_SOURCE_LOCATION (label) = input_location;
3024 /* No label binding for that identifier; make one. */
3025 label = make_label (input_location, name, false, &label_vars);
3027 /* Ordinary labels go in the current function scope. */
3028 bind_label (name, label, current_function_scope, label_vars);
3033 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3037 warn_about_goto (location_t goto_loc, tree label, tree decl)
3039 if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3041 "jump into scope of identifier with variably modified type");
3043 warning_at (goto_loc, OPT_Wjump_misses_init,
3044 "jump skips variable initialization");
3045 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3046 inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl);
3049 /* Look up a label because of a goto statement. This is like
3050 lookup_label, but also issues any appropriate warnings. */
3053 lookup_label_for_goto (location_t loc, tree name)
3056 struct c_label_vars *label_vars;
3060 label = lookup_label (name);
3061 if (label == NULL_TREE)
3064 /* If we are jumping to a different function, we can't issue any
3066 if (DECL_CONTEXT (label) != current_function_decl)
3068 gcc_assert (C_DECLARED_LABEL_FLAG (label));
3072 label_vars = I_LABEL_BINDING (name)->u.label;
3074 /* If the label has not yet been defined, then push this goto on a
3075 list for possible later warnings. */
3076 if (label_vars->label_bindings.scope == NULL)
3078 struct c_goto_bindings *g;
3080 g = GGC_NEW (struct c_goto_bindings);
3082 set_spot_bindings (&g->goto_bindings, true);
3083 VEC_safe_push (c_goto_bindings_p, gc, label_vars->gotos, g);
3087 /* If there are any decls in label_vars->decls_in_scope, then this
3088 goto has missed the declaration of the decl. This happens for a
3094 Issue a warning or error. */
3095 for (ix = 0; VEC_iterate (tree, label_vars->decls_in_scope, ix, decl); ++ix)
3096 warn_about_goto (loc, label, decl);
3098 if (label_vars->label_bindings.left_stmt_expr)
3100 error_at (loc, "jump into statement expression");
3101 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3107 /* Make a label named NAME in the current function, shadowing silently
3108 any that may be inherited from containing functions or containing
3109 scopes. This is called for __label__ declarations. */
3112 declare_label (tree name)
3114 struct c_binding *b = I_LABEL_BINDING (name);
3116 struct c_label_vars *label_vars;
3118 /* Check to make sure that the label hasn't already been declared
3120 if (b && B_IN_CURRENT_SCOPE (b))
3122 error ("duplicate label declaration %qE", name);
3123 locate_old_decl (b->decl);
3125 /* Just use the previous declaration. */
3129 label = make_label (input_location, name, false, &label_vars);
3130 C_DECLARED_LABEL_FLAG (label) = 1;
3132 /* Declared labels go in the current scope. */
3133 bind_label (name, label, current_scope, label_vars);
3138 /* When we define a label, issue any appropriate warnings if there are
3139 any gotos earlier in the function which jump to this label. */
3142 check_earlier_gotos (tree label, struct c_label_vars* label_vars)
3145 struct c_goto_bindings *g;
3148 VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g);
3151 struct c_binding *b;
3152 struct c_scope *scope;
3154 /* We have a goto to this label. The goto is going forward. In
3155 g->scope, the goto is going to skip any binding which was
3156 defined after g->bindings_in_scope. */
3157 for (b = g->goto_bindings.scope->bindings;
3158 b != g->goto_bindings.bindings_in_scope;
3161 if (decl_jump_unsafe (b->decl))
3162 warn_about_goto (g->loc, label, b->decl);
3165 /* We also need to warn about decls defined in any scopes
3166 between the scope of the label and the scope of the goto. */
3167 for (scope = label_vars->label_bindings.scope;
3168 scope != g->goto_bindings.scope;
3169 scope = scope->outer)
3171 gcc_assert (scope != NULL);
3172 if (scope == label_vars->label_bindings.scope)
3173 b = label_vars->label_bindings.bindings_in_scope;
3175 b = scope->bindings;
3176 for (; b != NULL; b = b->prev)
3178 if (decl_jump_unsafe (b->decl))
3179 warn_about_goto (g->loc, label, b->decl);
3183 if (g->goto_bindings.stmt_exprs > 0)
3185 error_at (g->loc, "jump into statement expression");
3186 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here",
3191 /* Now that the label is defined, we will issue warnings about
3192 subsequent gotos to this label when we see them. */
3193 VEC_truncate (c_goto_bindings_p, label_vars->gotos, 0);
3194 label_vars->gotos = NULL;
3197 /* Define a label, specifying the location in the source file.
3198 Return the LABEL_DECL node for the label, if the definition is valid.
3199 Otherwise return 0. */
3202 define_label (location_t location, tree name)
3204 /* Find any preexisting label with this name. It is an error
3205 if that label has already been defined in this function, or
3206 if there is a containing function with a declared label with
3208 tree label = I_LABEL_DECL (name);
3211 && ((DECL_CONTEXT (label) == current_function_decl
3212 && DECL_INITIAL (label) != 0)
3213 || (DECL_CONTEXT (label) != current_function_decl
3214 && C_DECLARED_LABEL_FLAG (label))))
3216 error_at (location, "duplicate label %qD", label);
3217 locate_old_decl (label);
3220 else if (label && DECL_CONTEXT (label) == current_function_decl)
3222 struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label;
3224 /* The label has been used or declared already in this function,
3225 but not defined. Update its location to point to this
3227 DECL_SOURCE_LOCATION (label) = location;
3228 set_spot_bindings (&label_vars->label_bindings, true);
3230 /* Issue warnings as required about any goto statements from
3231 earlier in the function. */
3232 check_earlier_gotos (label, label_vars);
3236 struct c_label_vars *label_vars;
3238 /* No label binding for that identifier; make one. */
3239 label = make_label (location, name, true, &label_vars);
3241 /* Ordinary labels go in the current function scope. */
3242 bind_label (name, label, current_function_scope, label_vars);
3245 if (!in_system_header && lookup_name (name))
3246 warning_at (location, OPT_Wtraditional,
3247 "traditional C lacks a separate namespace "
3248 "for labels, identifier %qE conflicts", name);
3250 /* Mark label as having been defined. */
3251 DECL_INITIAL (label) = error_mark_node;
3255 /* Get the bindings for a new switch statement. This is used to issue
3256 warnings as appropriate for jumps from the switch to case or
3259 struct c_spot_bindings *
3260 c_get_switch_bindings (void)
3262 struct c_spot_bindings *switch_bindings;
3264 switch_bindings = XNEW (struct c_spot_bindings);
3265 set_spot_bindings (switch_bindings, true);
3266 return switch_bindings;
3270 c_release_switch_bindings (struct c_spot_bindings *bindings)
3272 gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr);
3276 /* This is called at the point of a case or default label to issue
3277 warnings about decls as needed. It returns true if it found an
3278 error, not just a warning. */
3281 c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings,
3282 location_t switch_loc, location_t case_loc)
3285 struct c_scope *scope;
3288 for (scope = current_scope;
3289 scope != switch_bindings->scope;
3290 scope = scope->outer)
3292 struct c_binding *b;
3294 gcc_assert (scope != NULL);
3295 for (b = scope->bindings; b != NULL; b = b->prev)
3297 if (decl_jump_unsafe (b->decl))
3299 if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE))
3303 ("switch jumps into scope of identifier with "
3304 "variably modified type"));
3307 warning_at (case_loc, OPT_Wjump_misses_init,
3308 "switch jumps over variable initialization");
3309 inform (switch_loc, "switch starts here");
3310 inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here",
3316 if (switch_bindings->stmt_exprs > 0)
3319 error_at (case_loc, "switch jumps into statement expression");
3320 inform (switch_loc, "switch starts here");
3326 /* Given NAME, an IDENTIFIER_NODE,
3327 return the structure (or union or enum) definition for that name.
3328 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3329 CODE says which kind of type the caller wants;
3330 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3331 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3332 location where the tag was defined.
3333 If the wrong kind of type is found, an error is reported. */
3336 lookup_tag (enum tree_code code, tree name, int thislevel_only,
3339 struct c_binding *b = I_TAG_BINDING (name);
3345 /* We only care about whether it's in this level if
3346 thislevel_only was set or it might be a type clash. */
3347 if (thislevel_only || TREE_CODE (b->decl) != code)
3349 /* For our purposes, a tag in the external scope is the same as
3350 a tag in the file scope. (Primarily relevant to Objective-C
3351 and its builtin structure tags, which get pushed before the
3352 file scope is created.) */
3353 if (B_IN_CURRENT_SCOPE (b)
3354 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
3358 if (thislevel_only && !thislevel)
3361 if (TREE_CODE (b->decl) != code)
3363 /* Definition isn't the kind we were looking for. */
3364 pending_invalid_xref = name;
3365 pending_invalid_xref_location = input_location;
3367 /* If in the same binding level as a declaration as a tag
3368 of a different type, this must not be allowed to
3369 shadow that tag, so give the error immediately.
3370 (For example, "struct foo; union foo;" is invalid.) */
3372 pending_xref_error ();
3381 /* Print an error message now
3382 for a recent invalid struct, union or enum cross reference.
3383 We don't print them immediately because they are not invalid
3384 when used in the `struct foo;' construct for shadowing. */
3387 pending_xref_error (void)
3389 if (pending_invalid_xref != 0)
3390 error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag",
3391 pending_invalid_xref);
3392 pending_invalid_xref = 0;
3396 /* Look up NAME in the current scope and its superiors
3397 in the namespace of variables, functions and typedefs.
3398 Return a ..._DECL node of some kind representing its definition,
3399 or return 0 if it is undefined. */
3402 lookup_name (tree name)
3404 struct c_binding *b = I_SYMBOL_BINDING (name);
3405 if (b && !b->invisible)
3410 /* Similar to `lookup_name' but look only at the indicated scope. */
3413 lookup_name_in_scope (tree name, struct c_scope *scope)
3415 struct c_binding *b;
3417 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
3418 if (B_IN_SCOPE (b, scope))
3423 /* Create the predefined scalar types of C,
3424 and some nodes representing standard constants (0, 1, (void *) 0).
3425 Initialize the global scope.
3426 Make definitions for built-in primitive functions. */
3429 c_init_decl_processing (void)
3431 location_t save_loc = input_location;
3433 /* Initialize reserved words for parser. */
3436 current_function_decl = 0;
3438 gcc_obstack_init (&parser_obstack);
3440 /* Make the externals scope. */
3442 external_scope = current_scope;
3444 /* Declarations from c_common_nodes_and_builtins must not be associated
3445 with this input file, lest we get differences between using and not
3446 using preprocessed headers. */
3447 input_location = BUILTINS_LOCATION;
3449 build_common_tree_nodes (flag_signed_char, false);
3451 c_common_nodes_and_builtins ();
3453 /* In C, comparisons and TRUTH_* expressions have type int. */
3454 truthvalue_type_node = integer_type_node;
3455 truthvalue_true_node = integer_one_node;
3456 truthvalue_false_node = integer_zero_node;
3458 /* Even in C99, which has a real boolean type. */
3459 pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"),
3460 boolean_type_node));
3462 input_location = save_loc;
3464 pedantic_lvalues = true;
3466 make_fname_decl = c_make_fname_decl;
3467 start_fname_decls ();
3470 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3471 give the decl, NAME is the initialization string and TYPE_DEP
3472 indicates whether NAME depended on the type of the function. As we
3473 don't yet implement delayed emission of static data, we mark the
3474 decl as emitted so it is not placed in the output. Anything using
3475 it must therefore pull out the STRING_CST initializer directly.
3479 c_make_fname_decl (location_t loc, tree id, int type_dep)
3481 const char *name = fname_as_string (type_dep);
3482 tree decl, type, init;
3483 size_t length = strlen (name);
3485 type = build_array_type (char_type_node,
3486 build_index_type (size_int (length)));
3487 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
3489 decl = build_decl (loc, VAR_DECL, id, type);
3491 TREE_STATIC (decl) = 1;
3492 TREE_READONLY (decl) = 1;
3493 DECL_ARTIFICIAL (decl) = 1;
3495 init = build_string (length + 1, name);
3496 free (CONST_CAST (char *, name));
3497 TREE_TYPE (init) = type;
3498 DECL_INITIAL (decl) = init;
3500 TREE_USED (decl) = 1;
3502 if (current_function_decl
3503 /* For invalid programs like this:
3506 const char* p = __FUNCTION__;
3508 the __FUNCTION__ is believed to appear in K&R style function
3509 parameter declarator. In that case we still don't have
3511 && (!errorcount || current_function_scope))
3513 DECL_CONTEXT (decl) = current_function_decl;
3514 bind (id, decl, current_function_scope,
3515 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
3518 finish_decl (decl, loc, init, NULL_TREE, NULL_TREE);
3524 c_builtin_function (tree decl)
3526 tree type = TREE_TYPE (decl);
3527 tree id = DECL_NAME (decl);
3529 const char *name = IDENTIFIER_POINTER (id);
3530 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
3532 /* Should never be called on a symbol with a preexisting meaning. */
3533 gcc_assert (!I_SYMBOL_BINDING (id));
3535 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false,
3538 /* Builtins in the implementation namespace are made visible without
3539 needing to be explicitly declared. See push_file_scope. */
3540 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3542 TREE_CHAIN (decl) = visible_builtins;
3543 visible_builtins = decl;
3550 c_builtin_function_ext_scope (tree decl)
3552 tree type = TREE_TYPE (decl);
3553 tree id = DECL_NAME (decl);
3555 const char *name = IDENTIFIER_POINTER (id);
3556 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
3558 /* Should never be called on a symbol with a preexisting meaning. */
3559 gcc_assert (!I_SYMBOL_BINDING (id));
3561 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false,
3564 /* Builtins in the implementation namespace are made visible without
3565 needing to be explicitly declared. See push_file_scope. */
3566 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3568 TREE_CHAIN (decl) = visible_builtins;
3569 visible_builtins = decl;
3575 /* Called when a declaration is seen that contains no names to declare.
3576 If its type is a reference to a structure, union or enum inherited
3577 from a containing scope, shadow that tag name for the current scope
3578 with a forward reference.
3579 If its type defines a new named structure or union
3580 or defines an enum, it is valid but we need not do anything here.
3581 Otherwise, it is an error. */
3584 shadow_tag (const struct c_declspecs *declspecs)
3586 shadow_tag_warned (declspecs, 0);
3589 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3592 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
3594 bool found_tag = false;
3596 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
3598 tree value = declspecs->type;
3599 enum tree_code code = TREE_CODE (value);
3601 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3602 /* Used to test also that TYPE_SIZE (value) != 0.
3603 That caused warning for `struct foo;' at top level in the file. */
3605 tree name = TYPE_NAME (value);
3610 if (declspecs->restrict_p)
3612 error ("invalid use of %<restrict%>");
3618 if (warned != 1 && code != ENUMERAL_TYPE)
3619 /* Empty unnamed enum OK */
3621 pedwarn (input_location, 0,
3622 "unnamed struct/union that defines no instances");
3626 else if (!declspecs->tag_defined_p
3627 && declspecs->storage_class != csc_none)
3630 pedwarn (input_location, 0,
3631 "empty declaration with storage class specifier "
3632 "does not redeclare tag");
3634 pending_xref_error ();
3636 else if (!declspecs->tag_defined_p
3637 && (declspecs->const_p
3638 || declspecs->volatile_p
3639 || declspecs->restrict_p
3640 || declspecs->address_space))
3643 pedwarn (input_location, 0,
3644 "empty declaration with type qualifier "
3645 "does not redeclare tag");
3647 pending_xref_error ();
3651 pending_invalid_xref = 0;
3652 t = lookup_tag (code, name, 1, NULL);
3656 t = make_node (code);
3657 pushtag (input_location, name, t);
3663 if (warned != 1 && !in_system_header)
3665 pedwarn (input_location, 0,
3666 "useless type name in empty declaration");
3671 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
3673 pedwarn (input_location, 0, "useless type name in empty declaration");
3677 pending_invalid_xref = 0;
3679 if (declspecs->inline_p)
3681 error ("%<inline%> in empty declaration");
3685 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
3687 error ("%<auto%> in file-scope empty declaration");
3691 if (current_scope == file_scope && declspecs->storage_class == csc_register)
3693 error ("%<register%> in file-scope empty declaration");
3697 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
3699 warning (0, "useless storage class specifier in empty declaration");
3703 if (!warned && !in_system_header && declspecs->thread_p)
3705 warning (0, "useless %<__thread%> in empty declaration");
3709 if (!warned && !in_system_header && (declspecs->const_p
3710 || declspecs->volatile_p
3711 || declspecs->restrict_p
3712 || declspecs->address_space))
3714 warning (0, "useless type qualifier in empty declaration");
3721 pedwarn (input_location, 0, "empty declaration");
3726 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3727 bits. SPECS represents declaration specifiers that the grammar
3728 only permits to contain type qualifiers and attributes. */
3731 quals_from_declspecs (const struct c_declspecs *specs)
3733 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3734 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3735 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0)
3736 | (ENCODE_QUAL_ADDR_SPACE (specs->address_space)));
3737 gcc_assert (!specs->type
3738 && !specs->decl_attr
3739 && specs->typespec_word == cts_none
3740 && specs->storage_class == csc_none
3741 && !specs->typedef_p
3742 && !specs->explicit_signed_p
3743 && !specs->deprecated_p
3745 && !specs->long_long_p
3748 && !specs->unsigned_p
3749 && !specs->complex_p
3751 && !specs->thread_p);
3755 /* Construct an array declarator. LOC is the location of the
3756 beginning of the array (usually the opening brace). EXPR is the
3757 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3758 inside the [] (to be applied to the pointer to which a parameter
3759 array is converted). STATIC_P is true if "static" is inside the
3760 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3761 VLA of unspecified length which is nevertheless a complete type,
3762 false otherwise. The field for the contained declarator is left to
3763 be filled in by set_array_declarator_inner. */
3765 struct c_declarator *
3766 build_array_declarator (location_t loc,
3767 tree expr, struct c_declspecs *quals, bool static_p,
3770 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3771 struct c_declarator);
3772 declarator->id_loc = loc;
3773 declarator->kind = cdk_array;
3774 declarator->declarator = 0;
3775 declarator->u.array.dimen = expr;
3778 declarator->u.array.attrs = quals->attrs;
3779 declarator->u.array.quals = quals_from_declspecs (quals);
3783 declarator->u.array.attrs = NULL_TREE;
3784 declarator->u.array.quals = 0;
3786 declarator->u.array.static_p = static_p;
3787 declarator->u.array.vla_unspec_p = vla_unspec_p;
3790 if (static_p || quals != NULL)
3791 pedwarn (loc, OPT_pedantic,
3792 "ISO C90 does not support %<static%> or type "
3793 "qualifiers in parameter array declarators");
3795 pedwarn (loc, OPT_pedantic,
3796 "ISO C90 does not support %<[*]%> array declarators");
3800 if (!current_scope->parm_flag)
3803 error_at (loc, "%<[*]%> not allowed in other than "
3804 "function prototype scope");
3805 declarator->u.array.vla_unspec_p = false;
3808 current_scope->had_vla_unspec = true;
3813 /* Set the contained declarator of an array declarator. DECL is the
3814 declarator, as constructed by build_array_declarator; INNER is what
3815 appears on the left of the []. */
3817 struct c_declarator *
3818 set_array_declarator_inner (struct c_declarator *decl,
3819 struct c_declarator *inner)
3821 decl->declarator = inner;
3825 /* INIT is a constructor that forms DECL's initializer. If the final
3826 element initializes a flexible array field, add the size of that
3827 initializer to DECL's size. */
3830 add_flexible_array_elts_to_size (tree decl, tree init)
3834 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3837 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3838 type = TREE_TYPE (elt);
3839 if (TREE_CODE (type) == ARRAY_TYPE
3840 && TYPE_SIZE (type) == NULL_TREE
3841 && TYPE_DOMAIN (type) != NULL_TREE
3842 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3844 complete_array_type (&type, elt, false);
3846 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3847 DECL_SIZE_UNIT (decl)
3848 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3852 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3853 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3854 before the type name, and set *EXPR_CONST_OPERANDS, if
3855 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3856 appear in a constant expression. */
3859 groktypename (struct c_type_name *type_name, tree *expr,
3860 bool *expr_const_operands)
3863 tree attrs = type_name->specs->attrs;
3865 type_name->specs->attrs = NULL_TREE;
3867 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3868 false, NULL, &attrs, expr, expr_const_operands,
3871 /* Apply attributes. */
3872 decl_attributes (&type, attrs, 0);
3877 /* Decode a declarator in an ordinary declaration or data definition.
3878 This is called as soon as the type information and variable name
3879 have been parsed, before parsing the initializer if any.
3880 Here we create the ..._DECL node, fill in its type,
3881 and put it on the list of decls for the current context.
3882 The ..._DECL node is returned as the value.
3884 Exception: for arrays where the length is not specified,
3885 the type is left null, to be filled in by `finish_decl'.
3887 Function definitions do not come here; they go to start_function
3888 instead. However, external and forward declarations of functions
3889 do go through here. Structure field declarations are done by
3890 grokfield and not through here. */
3893 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3894 bool initialized, tree attributes)
3898 tree expr = NULL_TREE;
3899 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
3901 /* An object declared as __attribute__((deprecated)) suppresses
3902 warnings of uses of other deprecated items. */
3903 if (lookup_attribute ("deprecated", attributes))
3904 deprecated_state = DEPRECATED_SUPPRESS;
3906 decl = grokdeclarator (declarator, declspecs,
3907 NORMAL, initialized, NULL, &attributes, &expr, NULL,
3915 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
3916 warning (OPT_Wmain, "%q+D is usually a function", decl);
3919 /* Is it valid for this decl to have an initializer at all?
3920 If not, set INITIALIZED to zero, which will indirectly
3921 tell 'finish_decl' to ignore the initializer once it is parsed. */
3922 switch (TREE_CODE (decl))
3925 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3930 error ("function %qD is initialized like a variable", decl);
3935 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3936 error ("parameter %qD is initialized", decl);
3941 /* Don't allow initializations for incomplete types except for
3942 arrays which might be completed by the initialization. */
3944 /* This can happen if the array size is an undefined macro.
3945 We already gave a warning, so we don't need another one. */
3946 if (TREE_TYPE (decl) == error_mark_node)
3948 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3950 /* A complete type is ok if size is fixed. */
3952 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3953 || C_DECL_VARIABLE_SIZE (decl))
3955 error ("variable-sized object may not be initialized");
3959 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3961 error ("variable %qD has initializer but incomplete type", decl);
3964 else if (C_DECL_VARIABLE_SIZE (decl))
3966 /* Although C99 is unclear about whether incomplete arrays
3967 of VLAs themselves count as VLAs, it does not make
3968 sense to permit them to be initialized given that
3969 ordinary VLAs may not be initialized. */
3970 error ("variable-sized object may not be initialized");
3977 if (current_scope == file_scope)
3978 TREE_STATIC (decl) = 1;
3980 /* Tell 'pushdecl' this is an initialized decl
3981 even though we don't yet have the initializer expression.
3982 Also tell 'finish_decl' it may store the real initializer. */
3983 DECL_INITIAL (decl) = error_mark_node;
3986 /* If this is a function declaration, write a record describing it to the
3987 prototypes file (if requested). */
3989 if (TREE_CODE (decl) == FUNCTION_DECL)
3990 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3992 /* ANSI specifies that a tentative definition which is not merged with
3993 a non-tentative definition behaves exactly like a definition with an
3994 initializer equal to zero. (Section 3.7.2)
3996 -fno-common gives strict ANSI behavior, though this tends to break
3997 a large body of code that grew up without this rule.
3999 Thread-local variables are never common, since there's no entrenched
4000 body of code to break, and it allows more efficient variable references
4001 in the presence of dynamic linking. */
4003 if (TREE_CODE (decl) == VAR_DECL
4005 && TREE_PUBLIC (decl)
4006 && !DECL_THREAD_LOCAL_P (decl)
4008 DECL_COMMON (decl) = 1;
4010 /* Set attributes here so if duplicate decl, will have proper attributes. */
4011 decl_attributes (&decl, attributes, 0);
4013 /* Handle gnu_inline attribute. */
4014 if (declspecs->inline_p
4015 && !flag_gnu89_inline
4016 && TREE_CODE (decl) == FUNCTION_DECL
4017 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
4018 || current_function_decl))
4020 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
4022 else if (declspecs->storage_class != csc_static)
4023 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
4026 if (TREE_CODE (decl) == FUNCTION_DECL
4027 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
4029 struct c_declarator *ce = declarator;
4031 if (ce->kind == cdk_pointer)
4032 ce = declarator->declarator;
4033 if (ce->kind == cdk_function)
4035 tree args = ce->u.arg_info->parms;
4036 for (; args; args = TREE_CHAIN (args))
4038 tree type = TREE_TYPE (args);
4039 if (type && INTEGRAL_TYPE_P (type)
4040 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4041 DECL_ARG_TYPE (args) = integer_type_node;
4046 if (TREE_CODE (decl) == FUNCTION_DECL
4047 && DECL_DECLARED_INLINE_P (decl)
4048 && DECL_UNINLINABLE (decl)
4049 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4050 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
4053 /* C99 6.7.4p3: An inline definition of a function with external
4054 linkage shall not contain a definition of a modifiable object
4055 with static storage duration... */
4056 if (TREE_CODE (decl) == VAR_DECL
4057 && current_scope != file_scope
4058 && TREE_STATIC (decl)
4059 && !TREE_READONLY (decl)
4060 && DECL_DECLARED_INLINE_P (current_function_decl)
4061 && DECL_EXTERNAL (current_function_decl))
4062 record_inline_static (input_location, current_function_decl,
4063 decl, csi_modifiable);
4065 /* Add this decl to the current scope.
4066 TEM may equal DECL or it may be a previous decl of the same name. */
4067 tem = pushdecl (decl);
4069 if (initialized && DECL_EXTERNAL (tem))
4071 DECL_EXTERNAL (tem) = 0;
4072 TREE_STATIC (tem) = 1;
4078 /* Finish processing of a declaration;
4079 install its initial value.
4080 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4081 If the length of an array type is not known before,
4082 it must be determined now, from the initial value, or it is an error.
4084 INIT_LOC is the location of the initial value. */
4087 finish_decl (tree decl, location_t init_loc, tree init,
4088 tree origtype, tree asmspec_tree)
4091 bool was_incomplete = (DECL_SIZE (decl) == 0);
4092 const char *asmspec = 0;
4094 /* If a name was specified, get the string. */
4095 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4096 && DECL_FILE_SCOPE_P (decl))
4097 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4099 asmspec = TREE_STRING_POINTER (asmspec_tree);
4101 if (TREE_CODE (decl) == VAR_DECL
4102 && TREE_STATIC (decl)
4103 && global_bindings_p ())
4104 /* So decl is a global variable. Record the types it uses
4105 so that we can decide later to emit debug info for them. */
4106 record_types_used_by_current_var_decl (decl);
4108 /* If `start_decl' didn't like having an initialization, ignore it now. */
4109 if (init != 0 && DECL_INITIAL (decl) == 0)
4112 /* Don't crash if parm is initialized. */
4113 if (TREE_CODE (decl) == PARM_DECL)
4117 store_init_value (init_loc, decl, init, origtype);
4119 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
4120 || TREE_CODE (decl) == FUNCTION_DECL
4121 || TREE_CODE (decl) == FIELD_DECL))
4122 objc_check_decl (decl);
4124 type = TREE_TYPE (decl);
4126 /* Deduce size of array from initialization, if not already known. */
4127 if (TREE_CODE (type) == ARRAY_TYPE
4128 && TYPE_DOMAIN (type) == 0
4129 && TREE_CODE (decl) != TYPE_DECL)
4132 = (TREE_STATIC (decl)
4133 /* Even if pedantic, an external linkage array
4134 may have incomplete type at first. */
4135 ? pedantic && !TREE_PUBLIC (decl)
4136 : !DECL_EXTERNAL (decl));
4138 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
4141 /* Get the completed type made by complete_array_type. */
4142 type = TREE_TYPE (decl);
4147 error ("initializer fails to determine size of %q+D", decl);
4152 error ("array size missing in %q+D", decl);
4153 /* If a `static' var's size isn't known,
4154 make it extern as well as static, so it does not get
4156 If it is not `static', then do not mark extern;
4157 finish_incomplete_decl will give it a default size
4158 and it will get allocated. */
4159 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4160 DECL_EXTERNAL (decl) = 1;
4164 error ("zero or negative size array %q+D", decl);
4168 /* For global variables, update the copy of the type that
4169 exists in the binding. */
4170 if (TREE_PUBLIC (decl))
4172 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
4173 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
4174 b_ext = b_ext->shadowed;
4178 b_ext->u.type = composite_type (b_ext->u.type, type);
4180 b_ext->u.type = type;
4189 if (DECL_INITIAL (decl))
4190 TREE_TYPE (DECL_INITIAL (decl)) = type;
4192 layout_decl (decl, 0);
4195 if (TREE_CODE (decl) == VAR_DECL)
4197 if (init && TREE_CODE (init) == CONSTRUCTOR)
4198 add_flexible_array_elts_to_size (decl, init);
4200 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
4201 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
4202 layout_decl (decl, 0);
4204 if (DECL_SIZE (decl) == 0
4205 /* Don't give an error if we already gave one earlier. */
4206 && TREE_TYPE (decl) != error_mark_node
4207 && (TREE_STATIC (decl)
4208 /* A static variable with an incomplete type
4209 is an error if it is initialized.
4210 Also if it is not file scope.
4211 Otherwise, let it through, but if it is not `extern'
4212 then it may cause an error message later. */
4213 ? (DECL_INITIAL (decl) != 0
4214 || !DECL_FILE_SCOPE_P (decl))
4215 /* An automatic variable with an incomplete type
4217 : !DECL_EXTERNAL (decl)))
4219 error ("storage size of %q+D isn%'t known", decl);
4220 TREE_TYPE (decl) = error_mark_node;
4223 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4224 && DECL_SIZE (decl) != 0)
4226 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4227 constant_expression_warning (DECL_SIZE (decl));
4230 error ("storage size of %q+D isn%'t constant", decl);
4231 TREE_TYPE (decl) = error_mark_node;
4235 if (TREE_USED (type))
4236 TREE_USED (decl) = 1;
4239 /* If this is a function and an assembler name is specified, reset DECL_RTL
4240 so we can give it its new name. Also, update built_in_decls if it
4241 was a normal built-in. */
4242 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4244 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4245 set_builtin_user_assembler_name (decl, asmspec);
4246 set_user_assembler_name (decl, asmspec);
4249 /* If #pragma weak was used, mark the decl weak now. */
4250 maybe_apply_pragma_weak (decl);
4252 /* Output the assembler code and/or RTL code for variables and functions,
4253 unless the type is an undefined structure or union.
4254 If not, it will get done when the type is completed. */
4256 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4258 /* Determine the ELF visibility. */
4259 if (TREE_PUBLIC (decl))
4260 c_determine_visibility (decl);
4262 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4263 if (c_dialect_objc ())
4264 objc_check_decl (decl);
4268 /* If this is not a static variable, issue a warning.
4269 It doesn't make any sense to give an ASMSPEC for an
4270 ordinary, non-register local variable. Historically,
4271 GCC has accepted -- but ignored -- the ASMSPEC in
4273 if (!DECL_FILE_SCOPE_P (decl)
4274 && TREE_CODE (decl) == VAR_DECL
4275 && !C_DECL_REGISTER (decl)
4276 && !TREE_STATIC (decl))
4277 warning (0, "ignoring asm-specifier for non-static local "
4278 "variable %q+D", decl);
4280 set_user_assembler_name (decl, asmspec);
4283 if (DECL_FILE_SCOPE_P (decl))
4285 if (DECL_INITIAL (decl) == NULL_TREE
4286 || DECL_INITIAL (decl) == error_mark_node)
4287 /* Don't output anything
4288 when a tentative file-scope definition is seen.
4289 But at end of compilation, do output code for them. */
4290 DECL_DEFER_OUTPUT (decl) = 1;
4291 rest_of_decl_compilation (decl, true, 0);
4295 /* In conjunction with an ASMSPEC, the `register'
4296 keyword indicates that we should place the variable
4297 in a particular register. */
4298 if (asmspec && C_DECL_REGISTER (decl))
4300 DECL_HARD_REGISTER (decl) = 1;
4301 /* This cannot be done for a structure with volatile
4302 fields, on which DECL_REGISTER will have been
4304 if (!DECL_REGISTER (decl))
4305 error ("cannot put object with volatile field into register");
4308 if (TREE_CODE (decl) != FUNCTION_DECL)
4310 /* If we're building a variable sized type, and we might be
4311 reachable other than via the top of the current binding
4312 level, then create a new BIND_EXPR so that we deallocate
4313 the object at the right time. */
4314 /* Note that DECL_SIZE can be null due to errors. */
4315 if (DECL_SIZE (decl)
4316 && !TREE_CONSTANT (DECL_SIZE (decl))
4317 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
4320 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
4321 TREE_SIDE_EFFECTS (bind) = 1;
4323 BIND_EXPR_BODY (bind) = push_stmt_list ();
4325 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
4331 if (!DECL_FILE_SCOPE_P (decl))
4333 /* Recompute the RTL of a local array now
4334 if it used to be an incomplete type. */
4336 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
4338 /* If we used it already as memory, it must stay in memory. */
4339 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4340 /* If it's still incomplete now, no init will save it. */
4341 if (DECL_SIZE (decl) == 0)
4342 DECL_INITIAL (decl) = 0;
4347 if (TREE_CODE (decl) == TYPE_DECL)
4349 if (!DECL_FILE_SCOPE_P (decl)
4350 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
4351 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
4353 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
4356 /* At the end of a declaration, throw away any variable type sizes
4357 of types defined inside that declaration. There is no use
4358 computing them in the following function definition. */
4359 if (current_scope == file_scope)
4360 get_pending_sizes ();
4362 /* Install a cleanup (aka destructor) if one was given. */
4363 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
4365 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
4368 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
4369 tree cleanup_decl = lookup_name (cleanup_id);
4373 /* Build "cleanup(&decl)" for the destructor. */
4374 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
4375 vec = VEC_alloc (tree, gc, 1);
4376 VEC_quick_push (tree, vec, cleanup);
4377 cleanup = build_function_call_vec (DECL_SOURCE_LOCATION (decl),
4378 cleanup_decl, vec, NULL);
4379 VEC_free (tree, gc, vec);
4381 /* Don't warn about decl unused; the cleanup uses it. */
4382 TREE_USED (decl) = 1;
4383 TREE_USED (cleanup_decl) = 1;
4385 push_cleanup (decl, cleanup, false);
4390 && TREE_CODE (decl) == VAR_DECL
4391 && TREE_READONLY (decl)
4392 && !DECL_EXTERNAL (decl)
4393 && DECL_INITIAL (decl) == NULL_TREE)
4394 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4395 "uninitialized const %qD is invalid in C++", decl);
4398 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
4401 grokparm (const struct c_parm *parm)
4403 tree attrs = parm->attrs;
4404 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
4405 NULL, &attrs, NULL, NULL, DEPRECATED_NORMAL);
4407 decl_attributes (&decl, attrs, 0);
4412 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4413 and push that on the current scope. */
4416 push_parm_decl (const struct c_parm *parm)
4418 tree attrs = parm->attrs;
4421 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
4422 &attrs, NULL, NULL, DEPRECATED_NORMAL);
4423 decl_attributes (&decl, attrs, 0);
4425 decl = pushdecl (decl);
4427 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
4430 /* Mark all the parameter declarations to date as forward decls.
4431 Also diagnose use of this extension. */
4434 mark_forward_parm_decls (void)
4436 struct c_binding *b;
4438 if (pedantic && !current_scope->warned_forward_parm_decls)
4440 pedwarn (input_location, OPT_pedantic,
4441 "ISO C forbids forward parameter declarations");
4442 current_scope->warned_forward_parm_decls = true;
4445 for (b = current_scope->bindings; b; b = b->prev)
4446 if (TREE_CODE (b->decl) == PARM_DECL)
4447 TREE_ASM_WRITTEN (b->decl) = 1;
4450 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4451 literal, which may be an incomplete array type completed by the
4452 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4453 literal. NON_CONST is true if the initializers contain something
4454 that cannot occur in a constant expression. */
4457 build_compound_literal (location_t loc, tree type, tree init, bool non_const)
4459 /* We do not use start_decl here because we have a type, not a declarator;
4460 and do not use finish_decl because the decl should be stored inside
4461 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4466 if (type == error_mark_node)
4467 return error_mark_node;
4469 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
4470 DECL_EXTERNAL (decl) = 0;
4471 TREE_PUBLIC (decl) = 0;
4472 TREE_STATIC (decl) = (current_scope == file_scope);
4473 DECL_CONTEXT (decl) = current_function_decl;
4474 TREE_USED (decl) = 1;
4475 TREE_TYPE (decl) = type;
4476 TREE_READONLY (decl) = TYPE_READONLY (type);
4477 store_init_value (loc, decl, init, NULL_TREE);
4479 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4481 int failure = complete_array_type (&TREE_TYPE (decl),
4482 DECL_INITIAL (decl), true);
4483 gcc_assert (!failure);
4485 type = TREE_TYPE (decl);
4486 TREE_TYPE (DECL_INITIAL (decl)) = type;
4489 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
4490 return error_mark_node;
4492 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
4493 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
4494 TREE_SIDE_EFFECTS (complit) = 1;
4496 layout_decl (decl, 0);
4498 if (TREE_STATIC (decl))
4500 /* This decl needs a name for the assembler output. */
4501 set_compound_literal_name (decl);
4502 DECL_DEFER_OUTPUT (decl) = 1;
4503 DECL_COMDAT (decl) = 1;
4504 DECL_ARTIFICIAL (decl) = 1;
4505 DECL_IGNORED_P (decl) = 1;
4507 rest_of_decl_compilation (decl, 1, 0);
4512 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
4513 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
4519 /* Check the type of a compound literal. Here we just check that it
4520 is valid for C++. */
4523 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
4525 if (warn_cxx_compat && type_name->specs->tag_defined_p)
4526 warning_at (loc, OPT_Wc___compat,
4527 "defining a type in a compound literal is invalid in C++");
4530 /* Determine whether TYPE is a structure with a flexible array member,
4531 or a union containing such a structure (possibly recursively). */
4534 flexible_array_type_p (tree type)
4537 switch (TREE_CODE (type))
4540 x = TYPE_FIELDS (type);
4543 while (TREE_CHAIN (x) != NULL_TREE)
4545 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
4546 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
4547 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
4548 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
4552 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
4554 if (flexible_array_type_p (TREE_TYPE (x)))
4563 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4564 replacing with appropriate values if they are invalid. */
4566 check_bitfield_type_and_width (tree *type, tree *width, tree orig_name)
4569 unsigned int max_width;
4570 unsigned HOST_WIDE_INT w;
4571 const char *name = (orig_name
4572 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
4573 : _("<anonymous>"));
4575 /* Detect and ignore out of range field width and process valid
4577 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)))
4579 error ("bit-field %qs width not an integer constant", name);
4580 *width = integer_one_node;
4584 if (TREE_CODE (*width) != INTEGER_CST)
4586 *width = c_fully_fold (*width, false, NULL);
4587 if (TREE_CODE (*width) == INTEGER_CST)
4588 pedwarn (input_location, OPT_pedantic,
4589 "bit-field %qs width not an integer constant expression",
4592 if (TREE_CODE (*width) != INTEGER_CST)
4594 error ("bit-field %qs width not an integer constant", name);
4595 *width = integer_one_node;
4597 constant_expression_warning (*width);
4598 if (tree_int_cst_sgn (*width) < 0)
4600 error ("negative width in bit-field %qs", name);
4601 *width = integer_one_node;
4603 else if (integer_zerop (*width) && orig_name)
4605 error ("zero width for bit-field %qs", name);
4606 *width = integer_one_node;
4610 /* Detect invalid bit-field type. */
4611 if (TREE_CODE (*type) != INTEGER_TYPE
4612 && TREE_CODE (*type) != BOOLEAN_TYPE
4613 && TREE_CODE (*type) != ENUMERAL_TYPE)
4615 error ("bit-field %qs has invalid type", name);
4616 *type = unsigned_type_node;
4619 type_mv = TYPE_MAIN_VARIANT (*type);
4620 if (!in_system_header
4621 && type_mv != integer_type_node
4622 && type_mv != unsigned_type_node
4623 && type_mv != boolean_type_node)
4624 pedwarn (input_location, OPT_pedantic,
4625 "type of bit-field %qs is a GCC extension", name);
4627 max_width = TYPE_PRECISION (*type);
4629 if (0 < compare_tree_int (*width, max_width))
4631 error ("width of %qs exceeds its type", name);
4633 *width = build_int_cst (NULL_TREE, w);
4636 w = tree_low_cst (*width, 1);
4638 if (TREE_CODE (*type) == ENUMERAL_TYPE)
4640 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
4642 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
4643 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
4644 warning (0, "%qs is narrower than values of its type", name);
4650 /* Print warning about variable length array if necessary. */
4653 warn_variable_length_array (tree name, tree size)
4655 int const_size = TREE_CONSTANT (size);
4657 if (!flag_isoc99 && pedantic && warn_vla != 0)
4662 pedwarn (input_location, OPT_Wvla,
4663 "ISO C90 forbids array %qE whose size "
4664 "can%'t be evaluated",
4667 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size "
4668 "can%'t be evaluated");
4673 pedwarn (input_location, OPT_Wvla,
4674 "ISO C90 forbids variable length array %qE",
4677 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array");
4680 else if (warn_vla > 0)
4686 "the size of array %qE can"
4687 "%'t be evaluated", name);
4690 "the size of array can %'t be evaluated");
4696 "variable length array %qE is used",
4700 "variable length array is used");
4705 /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to
4706 serve as the actual size-expression for a type or decl. This is
4707 like variable_size in stor-layout.c, but we make global_bindings_p
4708 return negative to avoid calls to that function from outside the
4709 front end resulting in errors at file scope, then call this version
4710 instead from front-end code. */
4713 c_variable_size (tree size)
4717 if (TREE_CONSTANT (size))
4720 size = save_expr (size);
4722 save = skip_simple_arithmetic (size);
4724 if (cfun && cfun->dont_save_pending_sizes_p)
4727 if (!global_bindings_p ())
4728 put_pending_size (save);
4733 /* Given declspecs and a declarator,
4734 determine the name and type of the object declared
4735 and construct a ..._DECL node for it.
4736 (In one case we can return a ..._TYPE node instead.
4737 For invalid input we sometimes return 0.)
4739 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4741 DECL_CONTEXT says which syntactic context this declaration is in:
4742 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4743 FUNCDEF for a function definition. Like NORMAL but a few different
4744 error messages in each case. Return value may be zero meaning
4745 this definition is too screwy to try to parse.
4746 PARM for a parameter declaration (either within a function prototype
4747 or before a function body). Make a PARM_DECL, or return void_type_node.
4748 TYPENAME if for a typename (in a cast or sizeof).
4749 Don't make a DECL node; just return the ..._TYPE node.
4750 FIELD for a struct or union field; make a FIELD_DECL.
4751 INITIALIZED is true if the decl has an initializer.
4752 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4753 representing the width of the bit-field.
4754 DECL_ATTRS points to the list of attributes that should be added to this
4755 decl. Any nested attributes that belong on the decl itself will be
4757 If EXPR is not NULL, any expressions that need to be evaluated as
4758 part of evaluating variably modified types will be stored in *EXPR.
4759 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4760 set to indicate whether operands in *EXPR can be used in constant
4762 DEPRECATED_STATE is a deprecated_states value indicating whether
4763 deprecation warnings should be suppressed.
4765 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4766 It may also be so in the PARM case, for a prototype where the
4767 argument type is specified but not the name.
4769 This function is where the complicated C meanings of `static'
4770 and `extern' are interpreted. */
4773 grokdeclarator (const struct c_declarator *declarator,
4774 struct c_declspecs *declspecs,
4775 enum decl_context decl_context, bool initialized, tree *width,
4776 tree *decl_attrs, tree *expr, bool *expr_const_operands,
4777 enum deprecated_states deprecated_state)
4779 tree type = declspecs->type;
4780 bool threadp = declspecs->thread_p;
4781 enum c_storage_class storage_class = declspecs->storage_class;
4785 int type_quals = TYPE_UNQUALIFIED;
4786 tree name = NULL_TREE;
4787 bool funcdef_flag = false;
4788 bool funcdef_syntax = false;
4789 bool size_varies = false;
4790 tree decl_attr = declspecs->decl_attr;
4791 int array_ptr_quals = TYPE_UNQUALIFIED;
4792 tree array_ptr_attrs = NULL_TREE;
4793 int array_parm_static = 0;
4794 bool array_parm_vla_unspec_p = false;
4795 tree returned_attrs = NULL_TREE;
4796 bool bitfield = width != NULL;
4798 struct c_arg_info *arg_info = 0;
4799 addr_space_t as1, as2, address_space;
4800 location_t loc = UNKNOWN_LOCATION;
4803 bool expr_const_operands_dummy;
4807 if (expr_const_operands == NULL)
4808 expr_const_operands = &expr_const_operands_dummy;
4810 *expr = declspecs->expr;
4811 *expr_const_operands = declspecs->expr_const_operands;
4813 if (decl_context == FUNCDEF)
4814 funcdef_flag = true, decl_context = NORMAL;
4816 /* Look inside a declarator for the name being declared
4817 and get it as an IDENTIFIER_NODE, for an error message. */
4819 const struct c_declarator *decl = declarator;
4830 funcdef_syntax = (decl->kind == cdk_function);
4831 decl = decl->declarator;
4835 decl = decl->declarator;
4850 gcc_assert (decl_context == PARM
4851 || decl_context == TYPENAME
4852 || (decl_context == FIELD
4853 && declarator->kind == cdk_id));
4854 gcc_assert (!initialized);
4858 /* A function definition's declarator must have the form of
4859 a function declarator. */
4861 if (funcdef_flag && !funcdef_syntax)
4864 /* If this looks like a function definition, make it one,
4865 even if it occurs where parms are expected.
4866 Then store_parm_decls will reject it and not use it as a parm. */
4867 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4868 decl_context = PARM;
4870 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4871 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
4873 if ((decl_context == NORMAL || decl_context == FIELD)
4874 && current_scope == file_scope
4875 && variably_modified_type_p (type, NULL_TREE))
4878 error_at (loc, "variably modified %qE at file scope", name);
4880 error_at (loc, "variably modified field at file scope");
4881 type = integer_type_node;
4884 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
4886 /* Diagnose defaulting to "int". */
4888 if (declspecs->default_int_p && !in_system_header)
4890 /* Issue a warning if this is an ISO C 99 program or if
4891 -Wreturn-type and this is a function, or if -Wimplicit;
4892 prefer the former warning since it is more explicit. */
4893 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4895 warn_about_return_type = 1;
4899 pedwarn_c99 (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int,
4900 "type defaults to %<int%> in declaration of %qE",
4903 pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int,
4904 "type defaults to %<int%> in type name");
4908 /* Adjust the type if a bit-field is being declared,
4909 -funsigned-bitfields applied and the type is not explicitly
4911 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4912 && TREE_CODE (type) == INTEGER_TYPE)
4913 type = unsigned_type_for (type);
4915 /* Figure out the type qualifiers for the declaration. There are
4916 two ways a declaration can become qualified. One is something
4917 like `const int i' where the `const' is explicit. Another is
4918 something like `typedef const int CI; CI i' where the type of the
4919 declaration contains the `const'. A third possibility is that
4920 there is a type qualifier on the element type of a typedefed
4921 array type, in which case we should extract that qualifier so
4922 that c_apply_type_quals_to_decl receives the full list of
4923 qualifiers to work with (C90 is not entirely clear about whether
4924 duplicate qualifiers should be diagnosed in this case, but it
4925 seems most appropriate to do so). */
4926 element_type = strip_array_types (type);
4927 constp = declspecs->const_p + TYPE_READONLY (element_type);
4928 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4929 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4930 as1 = declspecs->address_space;
4931 as2 = TYPE_ADDR_SPACE (element_type);
4932 address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1;
4934 if (pedantic && !flag_isoc99)
4937 pedwarn (loc, OPT_pedantic, "duplicate %<const%>");
4939 pedwarn (loc, OPT_pedantic, "duplicate %<restrict%>");
4941 pedwarn (loc, OPT_pedantic, "duplicate %<volatile%>");
4944 if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2)
4945 error_at (loc, "conflicting named address spaces (%s vs %s)",
4946 c_addr_space_name (as1), c_addr_space_name (as2));
4948 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4949 type = TYPE_MAIN_VARIANT (type);
4950 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4951 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4952 | (volatilep ? TYPE_QUAL_VOLATILE : 0)
4953 | ENCODE_QUAL_ADDR_SPACE (address_space));
4955 /* Warn about storage classes that are invalid for certain
4956 kinds of declarations (parameters, typenames, etc.). */
4960 || storage_class == csc_auto
4961 || storage_class == csc_register
4962 || storage_class == csc_typedef))
4964 if (storage_class == csc_auto)
4966 (current_scope == file_scope) ? 0 : OPT_pedantic,
4967 "function definition declared %<auto%>");
4968 if (storage_class == csc_register)
4969 error_at (loc, "function definition declared %<register%>");
4970 if (storage_class == csc_typedef)
4971 error_at (loc, "function definition declared %<typedef%>");
4973 error_at (loc, "function definition declared %<__thread%>");
4975 if (storage_class == csc_auto
4976 || storage_class == csc_register
4977 || storage_class == csc_typedef)
4978 storage_class = csc_none;
4980 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4982 if (decl_context == PARM && storage_class == csc_register)
4986 switch (decl_context)
4990 error_at (loc, "storage class specified for structure "
4993 error_at (loc, "storage class specified for structure field");
4997 error_at (loc, "storage class specified for parameter %qE",
5000 error_at (loc, "storage class specified for unnamed parameter");
5003 error_at (loc, "storage class specified for typename");
5006 storage_class = csc_none;
5010 else if (storage_class == csc_extern
5014 /* 'extern' with initialization is invalid if not at file scope. */
5015 if (current_scope == file_scope)
5017 /* It is fine to have 'extern const' when compiling at C
5018 and C++ intersection. */
5019 if (!(warn_cxx_compat && constp))
5020 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
5024 error_at (loc, "%qE has both %<extern%> and initializer", name);
5026 else if (current_scope == file_scope)
5028 if (storage_class == csc_auto)
5029 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
5031 if (pedantic && storage_class == csc_register)
5032 pedwarn (input_location, OPT_pedantic,
5033 "file-scope declaration of %qE specifies %<register%>", name);
5037 if (storage_class == csc_extern && funcdef_flag)
5038 error_at (loc, "nested function %qE declared %<extern%>", name);
5039 else if (threadp && storage_class == csc_none)
5041 error_at (loc, "function-scope %qE implicitly auto and declared "
5048 /* Now figure out the structure of the declarator proper.
5049 Descend through it, creating more complex types, until we reach
5050 the declared identifier (or NULL_TREE, in an absolute declarator).
5051 At each stage we maintain an unqualified version of the type
5052 together with any qualifiers that should be applied to it with
5053 c_build_qualified_type; this way, array types including
5054 multidimensional array types are first built up in unqualified
5055 form and then the qualified form is created with
5056 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5058 while (declarator && declarator->kind != cdk_id)
5060 if (type == error_mark_node)
5062 declarator = declarator->declarator;
5066 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5067 a cdk_pointer (for *...),
5068 a cdk_function (for ...(...)),
5069 a cdk_attrs (for nested attributes),
5070 or a cdk_id (for the name being declared
5071 or the place in an absolute declarator
5072 where the name was omitted).
5073 For the last case, we have just exited the loop.
5075 At this point, TYPE is the type of elements of an array,
5076 or for a function to return, or for a pointer to point to.
5077 After this sequence of ifs, TYPE is the type of the
5078 array or function or pointer, and DECLARATOR has had its
5079 outermost layer removed. */
5081 if (array_ptr_quals != TYPE_UNQUALIFIED
5082 || array_ptr_attrs != NULL_TREE
5083 || array_parm_static)
5085 /* Only the innermost declarator (making a parameter be of
5086 array type which is converted to pointer type)
5087 may have static or type qualifiers. */
5088 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5089 array_ptr_quals = TYPE_UNQUALIFIED;
5090 array_ptr_attrs = NULL_TREE;
5091 array_parm_static = 0;
5094 switch (declarator->kind)
5098 /* A declarator with embedded attributes. */
5099 tree attrs = declarator->u.attrs;
5100 const struct c_declarator *inner_decl;
5102 declarator = declarator->declarator;
5103 inner_decl = declarator;
5104 while (inner_decl->kind == cdk_attrs)
5105 inner_decl = inner_decl->declarator;
5106 if (inner_decl->kind == cdk_id)
5107 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
5108 else if (inner_decl->kind == cdk_function)
5109 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
5110 else if (inner_decl->kind == cdk_array)
5111 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
5112 returned_attrs = decl_attributes (&type,
5113 chainon (returned_attrs, attrs),
5119 tree itype = NULL_TREE;
5120 tree size = declarator->u.array.dimen;
5121 /* The index is a signed object `sizetype' bits wide. */
5122 tree index_type = c_common_signed_type (sizetype);
5124 array_ptr_quals = declarator->u.array.quals;
5125 array_ptr_attrs = declarator->u.array.attrs;
5126 array_parm_static = declarator->u.array.static_p;
5127 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
5129 declarator = declarator->declarator;
5131 /* Check for some types that there cannot be arrays of. */
5133 if (VOID_TYPE_P (type))
5136 error_at (loc, "declaration of %qE as array of voids", name);
5138 error_at (loc, "declaration of type name as array of voids");
5139 type = error_mark_node;
5142 if (TREE_CODE (type) == FUNCTION_TYPE)
5145 error_at (loc, "declaration of %qE as array of functions",
5148 error_at (loc, "declaration of type name as array of "
5150 type = error_mark_node;
5153 if (pedantic && !in_system_header && flexible_array_type_p (type))
5154 pedwarn (loc, OPT_pedantic,
5155 "invalid use of structure with flexible array member");
5157 if (size == error_mark_node)
5158 type = error_mark_node;
5160 if (type == error_mark_node)
5163 /* If size was specified, set ITYPE to a range-type for
5164 that size. Otherwise, ITYPE remains null. finish_decl
5165 may figure it out from an initial value. */
5169 bool size_maybe_const = true;
5170 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
5171 && !TREE_OVERFLOW (size));
5172 bool this_size_varies = false;
5174 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5176 STRIP_TYPE_NOPS (size);
5178 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
5181 error_at (loc, "size of array %qE has non-integer type",
5185 "size of unnamed array has non-integer type");
5186 size = integer_one_node;
5189 size = c_fully_fold (size, false, &size_maybe_const);
5191 if (pedantic && size_maybe_const && integer_zerop (size))
5194 pedwarn (loc, OPT_pedantic,
5195 "ISO C forbids zero-size array %qE", name);
5197 pedwarn (loc, OPT_pedantic,
5198 "ISO C forbids zero-size array");
5201 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
5203 constant_expression_warning (size);
5204 if (tree_int_cst_sgn (size) < 0)
5207 error_at (loc, "size of array %qE is negative", name);
5209 error_at (loc, "size of unnamed array is negative");
5210 size = integer_one_node;
5212 /* Handle a size folded to an integer constant but
5213 not an integer constant expression. */
5214 if (!size_int_const)
5216 /* If this is a file scope declaration of an
5217 ordinary identifier, this is invalid code;
5218 diagnosing it here and not subsequently
5219 treating the type as variable-length avoids
5220 more confusing diagnostics later. */
5221 if ((decl_context == NORMAL || decl_context == FIELD)
5222 && current_scope == file_scope)
5223 pedwarn (input_location, 0,
5224 "variably modified %qE at file scope",
5227 this_size_varies = size_varies = true;
5228 warn_variable_length_array (name, size);
5231 else if ((decl_context == NORMAL || decl_context == FIELD)
5232 && current_scope == file_scope)
5234 error_at (loc, "variably modified %qE at file scope", name);
5235 size = integer_one_node;
5239 /* Make sure the array size remains visibly
5240 nonconstant even if it is (eg) a const variable
5241 with known value. */
5242 this_size_varies = size_varies = true;
5243 warn_variable_length_array (name, size);
5246 if (integer_zerop (size) && !this_size_varies)
5248 /* A zero-length array cannot be represented with
5249 an unsigned index type, which is what we'll
5250 get with build_index_type. Create an
5251 open-ended range instead. */
5252 itype = build_range_type (sizetype, size, NULL_TREE);
5256 /* Arrange for the SAVE_EXPR on the inside of the
5257 MINUS_EXPR, which allows the -1 to get folded
5258 with the +1 that happens when building TYPE_SIZE. */
5260 size = c_variable_size (size);
5261 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
5262 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5263 integer_zero_node, size);
5265 /* Compute the maximum valid index, that is, size
5266 - 1. Do the calculation in index_type, so that
5267 if it is a variable the computations will be
5268 done in the proper mode. */
5269 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
5270 convert (index_type, size),
5271 convert (index_type,
5274 /* If that overflowed, the array is too big. ???
5275 While a size of INT_MAX+1 technically shouldn't
5276 cause an overflow (because we subtract 1), the
5277 overflow is recorded during the conversion to
5278 index_type, before the subtraction. Handling
5279 this case seems like an unnecessary
5281 if (TREE_CODE (itype) == INTEGER_CST
5282 && TREE_OVERFLOW (itype))
5285 error_at (loc, "size of array %qE is too large",
5288 error_at (loc, "size of unnamed array is too large");
5289 type = error_mark_node;
5293 itype = build_index_type (itype);
5295 if (this_size_varies)
5298 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5302 *expr_const_operands &= size_maybe_const;
5305 else if (decl_context == FIELD)
5307 bool flexible_array_member = false;
5308 if (array_parm_vla_unspec_p)
5309 /* Field names can in fact have function prototype
5310 scope so [*] is disallowed here through making
5311 the field variably modified, not through being
5312 something other than a declaration with function
5317 const struct c_declarator *t = declarator;
5318 while (t->kind == cdk_attrs)
5320 flexible_array_member = (t->kind == cdk_id);
5322 if (flexible_array_member
5323 && pedantic && !flag_isoc99 && !in_system_header)
5324 pedwarn (loc, OPT_pedantic,
5325 "ISO C90 does not support flexible array members");
5327 /* ISO C99 Flexible array members are effectively
5328 identical to GCC's zero-length array extension. */
5329 if (flexible_array_member || array_parm_vla_unspec_p)
5330 itype = build_range_type (sizetype, size_zero_node,
5333 else if (decl_context == PARM)
5335 if (array_parm_vla_unspec_p)
5337 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
5341 else if (decl_context == TYPENAME)
5343 if (array_parm_vla_unspec_p)
5346 warning (0, "%<[*]%> not in a declaration");
5347 /* We use this to avoid messing up with incomplete
5348 array types of the same type, that would
5349 otherwise be modified below. */
5350 itype = build_range_type (sizetype, size_zero_node,
5356 /* Complain about arrays of incomplete types. */
5357 if (!COMPLETE_TYPE_P (type))
5359 error_at (loc, "array type has incomplete element type");
5360 type = error_mark_node;
5363 /* When itype is NULL, a shared incomplete array type is
5364 returned for all array of a given type. Elsewhere we
5365 make sure we don't complete that type before copying
5366 it, but here we want to make sure we don't ever
5367 modify the shared type, so we gcc_assert (itype)
5370 addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals);
5371 if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type))
5372 type = build_qualified_type (type,
5373 ENCODE_QUAL_ADDR_SPACE (as));
5375 type = build_array_type (type, itype);
5378 if (type != error_mark_node)
5382 /* It is ok to modify type here even if itype is
5383 NULL: if size_varies, we're in a
5384 multi-dimensional array and the inner type has
5385 variable size, so the enclosing shared array type
5387 if (size && TREE_CODE (size) == INTEGER_CST)
5389 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5390 C_TYPE_VARIABLE_SIZE (type) = 1;
5393 /* The GCC extension for zero-length arrays differs from
5394 ISO flexible array members in that sizeof yields
5396 if (size && integer_zerop (size))
5399 TYPE_SIZE (type) = bitsize_zero_node;
5400 TYPE_SIZE_UNIT (type) = size_zero_node;
5401 SET_TYPE_STRUCTURAL_EQUALITY (type);
5403 if (array_parm_vla_unspec_p)
5406 /* The type is complete. C99 6.7.5.2p4 */
5407 TYPE_SIZE (type) = bitsize_zero_node;
5408 TYPE_SIZE_UNIT (type) = size_zero_node;
5409 SET_TYPE_STRUCTURAL_EQUALITY (type);
5413 if (decl_context != PARM
5414 && (array_ptr_quals != TYPE_UNQUALIFIED
5415 || array_ptr_attrs != NULL_TREE
5416 || array_parm_static))
5418 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5419 array_ptr_quals = TYPE_UNQUALIFIED;
5420 array_ptr_attrs = NULL_TREE;
5421 array_parm_static = 0;
5427 /* Say it's a definition only for the declarator closest
5428 to the identifier, apart possibly from some
5430 bool really_funcdef = false;
5434 const struct c_declarator *t = declarator->declarator;
5435 while (t->kind == cdk_attrs)
5437 really_funcdef = (t->kind == cdk_id);
5440 /* Declaring a function type. Make sure we have a valid
5441 type for the function to return. */
5442 if (type == error_mark_node)
5445 size_varies = false;
5447 /* Warn about some types functions can't return. */
5448 if (TREE_CODE (type) == FUNCTION_TYPE)
5451 error_at (loc, "%qE declared as function returning a "
5454 error_at (loc, "type name declared as function "
5455 "returning a function");
5456 type = integer_type_node;
5458 if (TREE_CODE (type) == ARRAY_TYPE)
5461 error_at (loc, "%qE declared as function returning an array",
5464 error_at (loc, "type name declared as function returning "
5466 type = integer_type_node;
5468 errmsg = targetm.invalid_return_type (type);
5472 type = integer_type_node;
5475 /* Construct the function type and go to the next
5476 inner layer of declarator. */
5477 arg_info = declarator->u.arg_info;
5478 arg_types = grokparms (arg_info, really_funcdef);
5480 put_pending_sizes (arg_info->pending_sizes);
5482 /* Type qualifiers before the return type of the function
5483 qualify the return type, not the function type. */
5486 /* Type qualifiers on a function return type are
5487 normally permitted by the standard but have no
5488 effect, so give a warning at -Wreturn-type.
5489 Qualifiers on a void return type are banned on
5490 function definitions in ISO C; GCC used to used
5491 them for noreturn functions. */
5492 if (VOID_TYPE_P (type) && really_funcdef)
5494 "function definition has qualified void return type");
5496 warning_at (loc, OPT_Wignored_qualifiers,
5497 "type qualifiers ignored on function return type");
5499 type = c_build_qualified_type (type, type_quals);
5501 type_quals = TYPE_UNQUALIFIED;
5503 type = build_function_type (type, arg_types);
5504 declarator = declarator->declarator;
5506 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5507 the formal parameter list of this FUNCTION_TYPE to point to
5508 the FUNCTION_TYPE node itself. */
5512 for (link = arg_info->tags;
5514 link = TREE_CHAIN (link))
5515 TYPE_CONTEXT (TREE_VALUE (link)) = type;
5521 /* Merge any constancy or volatility into the target type
5524 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5526 pedwarn (loc, OPT_pedantic,
5527 "ISO C forbids qualified function types");
5529 type = c_build_qualified_type (type, type_quals);
5530 size_varies = false;
5532 /* When the pointed-to type involves components of variable size,
5533 care must be taken to ensure that the size evaluation code is
5534 emitted early enough to dominate all the possible later uses
5535 and late enough for the variables on which it depends to have
5538 This is expected to happen automatically when the pointed-to
5539 type has a name/declaration of it's own, but special attention
5540 is required if the type is anonymous.
5542 We handle the NORMAL and FIELD contexts here by attaching an
5543 artificial TYPE_DECL to such pointed-to type. This forces the
5544 sizes evaluation at a safe point and ensures it is not deferred
5545 until e.g. within a deeper conditional context.
5547 We expect nothing to be needed here for PARM or TYPENAME.
5548 Pushing a TYPE_DECL at this point for TYPENAME would actually
5549 be incorrect, as we might be in the middle of an expression
5550 with side effects on the pointed-to type size "arguments" prior
5551 to the pointer declaration point and the fake TYPE_DECL in the
5552 enclosing context would force the size evaluation prior to the
5555 if (!TYPE_NAME (type)
5556 && (decl_context == NORMAL || decl_context == FIELD)
5557 && variably_modified_type_p (type, NULL_TREE))
5559 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
5560 DECL_ARTIFICIAL (decl) = 1;
5562 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
5563 TYPE_NAME (type) = decl;
5566 type = build_pointer_type (type);
5568 /* Process type qualifiers (such as const or volatile)
5569 that were given inside the `*'. */
5570 type_quals = declarator->u.pointer_quals;
5572 declarator = declarator->declarator;
5579 *decl_attrs = chainon (returned_attrs, *decl_attrs);
5581 /* Now TYPE has the actual type, apart from any qualifiers in
5584 /* Warn about address space used for things other than static memory or
5586 address_space = DECODE_QUAL_ADDR_SPACE (type_quals);
5587 if (!ADDR_SPACE_GENERIC_P (address_space))
5589 if (decl_context == NORMAL)
5591 switch (storage_class)
5594 error ("%qs combined with %<auto%> qualifier for %qE",
5595 c_addr_space_name (address_space), name);
5598 error ("%qs combined with %<register%> qualifier for %qE",
5599 c_addr_space_name (address_space), name);
5602 if (current_function_scope)
5604 error ("%qs specified for auto variable %qE",
5605 c_addr_space_name (address_space), name);
5617 else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE)
5620 error ("%qs specified for parameter %qE",
5621 c_addr_space_name (address_space), name);
5623 error ("%qs specified for unnamed parameter",
5624 c_addr_space_name (address_space));
5626 else if (decl_context == FIELD)
5629 error ("%qs specified for structure field %qE",
5630 c_addr_space_name (address_space), name);
5632 error ("%qs specified for structure field",
5633 c_addr_space_name (address_space));
5637 /* Check the type and width of a bit-field. */
5639 check_bitfield_type_and_width (&type, width, name);
5641 /* Did array size calculations overflow? */
5643 if (TREE_CODE (type) == ARRAY_TYPE
5644 && COMPLETE_TYPE_P (type)
5645 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
5646 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
5649 error_at (loc, "size of array %qE is too large", name);
5651 error_at (loc, "size of unnamed array is too large");
5652 /* If we proceed with the array type as it is, we'll eventually
5653 crash in tree_low_cst(). */
5654 type = error_mark_node;
5657 /* If this is declaring a typedef name, return a TYPE_DECL. */
5659 if (storage_class == csc_typedef)
5662 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5664 pedwarn (loc, OPT_pedantic,
5665 "ISO C forbids qualified function types");
5667 type = c_build_qualified_type (type, type_quals);
5668 decl = build_decl (declarator->id_loc,
5669 TYPE_DECL, declarator->u.id, type);
5670 if (declspecs->explicit_signed_p)
5671 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5672 if (declspecs->inline_p)
5673 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
5675 if (warn_cxx_compat && declarator->u.id != NULL_TREE)
5677 struct c_binding *b = I_TAG_BINDING (declarator->u.id);
5680 && b->decl != NULL_TREE
5681 && (B_IN_CURRENT_SCOPE (b)
5682 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
5683 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
5685 warning_at (declarator->id_loc, OPT_Wc___compat,
5686 ("using %qD as both a typedef and a tag is "
5689 if (b->locus != UNKNOWN_LOCATION)
5690 inform (b->locus, "originally defined here");
5697 /* If this is a type name (such as, in a cast or sizeof),
5698 compute the type and return it now. */
5700 if (decl_context == TYPENAME)
5702 /* Note that the grammar rejects storage classes in typenames
5704 gcc_assert (storage_class == csc_none && !threadp
5705 && !declspecs->inline_p);
5706 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5708 pedwarn (loc, OPT_pedantic,
5709 "ISO C forbids const or volatile function types");
5711 type = c_build_qualified_type (type, type_quals);
5715 if (pedantic && decl_context == FIELD
5716 && variably_modified_type_p (type, NULL_TREE))
5719 pedwarn (loc, OPT_pedantic, "a member of a structure or union cannot "
5720 "have a variably modified type");
5723 /* Aside from typedefs and type names (handle above),
5724 `void' at top level (not within pointer)
5725 is allowed only in public variables.
5726 We don't complain about parms either, but that is because
5727 a better error message can be made later. */
5729 if (VOID_TYPE_P (type) && decl_context != PARM
5730 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5731 && (storage_class == csc_extern
5732 || (current_scope == file_scope
5733 && !(storage_class == csc_static
5734 || storage_class == csc_register)))))
5736 error_at (loc, "variable or field %qE declared void", name);
5737 type = integer_type_node;
5740 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5741 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5746 if (decl_context == PARM)
5750 /* A parameter declared as an array of T is really a pointer to T.
5751 One declared as a function is really a pointer to a function. */
5753 if (TREE_CODE (type) == ARRAY_TYPE)
5755 /* Transfer const-ness of array into that of type pointed to. */
5756 type = TREE_TYPE (type);
5758 type = c_build_qualified_type (type, type_quals);
5759 type = build_pointer_type (type);
5760 type_quals = array_ptr_quals;
5762 type = c_build_qualified_type (type, type_quals);
5764 /* We don't yet implement attributes in this context. */
5765 if (array_ptr_attrs != NULL_TREE)
5766 warning_at (loc, OPT_Wattributes,
5767 "attributes in parameter array declarator ignored");
5769 size_varies = false;
5771 else if (TREE_CODE (type) == FUNCTION_TYPE)
5774 pedwarn (loc, OPT_pedantic,
5775 "ISO C forbids qualified function types");
5777 type = c_build_qualified_type (type, type_quals);
5778 type = build_pointer_type (type);
5779 type_quals = TYPE_UNQUALIFIED;
5781 else if (type_quals)
5782 type = c_build_qualified_type (type, type_quals);
5784 decl = build_decl (declarator->id_loc,
5785 PARM_DECL, declarator->u.id, type);
5787 C_DECL_VARIABLE_SIZE (decl) = 1;
5789 /* Compute the type actually passed in the parmlist,
5790 for the case where there is no prototype.
5791 (For example, shorts and chars are passed as ints.)
5792 When there is a prototype, this is overridden later. */
5794 if (type == error_mark_node)
5795 promoted_type = type;
5797 promoted_type = c_type_promotes_to (type);
5799 DECL_ARG_TYPE (decl) = promoted_type;
5800 if (declspecs->inline_p)
5801 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
5803 else if (decl_context == FIELD)
5805 /* Note that the grammar rejects storage classes in typenames
5807 gcc_assert (storage_class == csc_none && !threadp
5808 && !declspecs->inline_p);
5810 /* Structure field. It may not be a function. */
5812 if (TREE_CODE (type) == FUNCTION_TYPE)
5814 error_at (loc, "field %qE declared as a function", name);
5815 type = build_pointer_type (type);
5817 else if (TREE_CODE (type) != ERROR_MARK
5818 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
5821 error_at (loc, "field %qE has incomplete type", name);
5823 error_at (loc, "unnamed field has incomplete type");
5824 type = error_mark_node;
5826 type = c_build_qualified_type (type, type_quals);
5827 decl = build_decl (declarator->id_loc,
5828 FIELD_DECL, declarator->u.id, type);
5829 DECL_NONADDRESSABLE_P (decl) = bitfield;
5830 if (bitfield && !declarator->u.id)
5831 TREE_NO_WARNING (decl) = 1;
5834 C_DECL_VARIABLE_SIZE (decl) = 1;
5836 else if (TREE_CODE (type) == FUNCTION_TYPE)
5838 if (storage_class == csc_register || threadp)
5840 error_at (loc, "invalid storage class for function %qE", name);
5842 else if (current_scope != file_scope)
5844 /* Function declaration not at file scope. Storage
5845 classes other than `extern' are not allowed, C99
5846 6.7.1p5, and `extern' makes no difference. However,
5847 GCC allows 'auto', perhaps with 'inline', to support
5848 nested functions. */
5849 if (storage_class == csc_auto)
5850 pedwarn (loc, OPT_pedantic,
5851 "invalid storage class for function %qE", name);
5852 else if (storage_class == csc_static)
5854 error_at (loc, "invalid storage class for function %qE", name);
5856 storage_class = declspecs->storage_class = csc_none;
5862 decl = build_decl (declarator->id_loc,
5863 FUNCTION_DECL, declarator->u.id, type);
5864 decl = build_decl_attribute_variant (decl, decl_attr);
5866 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
5867 pedwarn (loc, OPT_pedantic,
5868 "ISO C forbids qualified function types");
5870 /* GNU C interprets a volatile-qualified function type to indicate
5871 that the function does not return. */
5872 if ((type_quals & TYPE_QUAL_VOLATILE)
5873 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
5874 warning_at (loc, 0, "%<noreturn%> function returns non-void value");
5876 /* Every function declaration is an external reference
5877 (DECL_EXTERNAL) except for those which are not at file
5878 scope and are explicitly declared "auto". This is
5879 forbidden by standard C (C99 6.7.1p5) and is interpreted by
5880 GCC to signify a forward declaration of a nested function. */
5881 if (storage_class == csc_auto && current_scope != file_scope)
5882 DECL_EXTERNAL (decl) = 0;
5883 /* In C99, a function which is declared 'inline' with 'extern'
5884 is not an external reference (which is confusing). It
5885 means that the later definition of the function must be output
5886 in this file, C99 6.7.4p6. In GNU C89, a function declared
5887 'extern inline' is an external reference. */
5888 else if (declspecs->inline_p && storage_class != csc_static)
5889 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
5890 == flag_gnu89_inline);
5892 DECL_EXTERNAL (decl) = !initialized;
5894 /* Record absence of global scope for `static' or `auto'. */
5896 = !(storage_class == csc_static || storage_class == csc_auto);
5898 /* For a function definition, record the argument information
5899 block where store_parm_decls will look for it. */
5901 current_function_arg_info = arg_info;
5903 if (declspecs->default_int_p)
5904 C_FUNCTION_IMPLICIT_INT (decl) = 1;
5906 /* Record presence of `inline', if it is reasonable. */
5907 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
5909 if (declspecs->inline_p)
5910 pedwarn (loc, 0, "cannot inline function %<main%>");
5912 else if (declspecs->inline_p)
5913 /* Record that the function is declared `inline'. */
5914 DECL_DECLARED_INLINE_P (decl) = 1;
5918 /* It's a variable. */
5919 /* An uninitialized decl with `extern' is a reference. */
5920 int extern_ref = !initialized && storage_class == csc_extern;
5922 type = c_build_qualified_type (type, type_quals);
5924 /* C99 6.2.2p7: It is invalid (compile-time undefined
5925 behavior) to create an 'extern' declaration for a
5926 variable if there is a global declaration that is
5927 'static' and the global declaration is not visible.
5928 (If the static declaration _is_ currently visible,
5929 the 'extern' declaration is taken to refer to that decl.) */
5930 if (extern_ref && current_scope != file_scope)
5932 tree global_decl = identifier_global_value (declarator->u.id);
5933 tree visible_decl = lookup_name (declarator->u.id);
5936 && global_decl != visible_decl
5937 && TREE_CODE (global_decl) == VAR_DECL
5938 && !TREE_PUBLIC (global_decl))
5939 error_at (loc, "variable previously declared %<static%> "
5940 "redeclared %<extern%>");
5943 decl = build_decl (declarator->id_loc,
5944 VAR_DECL, declarator->u.id, type);
5946 C_DECL_VARIABLE_SIZE (decl) = 1;
5948 if (declspecs->inline_p)
5949 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
5951 /* At file scope, an initialized extern declaration may follow
5952 a static declaration. In that case, DECL_EXTERNAL will be
5953 reset later in start_decl. */
5954 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
5956 /* At file scope, the presence of a `static' or `register' storage
5957 class specifier, or the absence of all storage class specifiers
5958 makes this declaration a definition (perhaps tentative). Also,
5959 the absence of `static' makes it public. */
5960 if (current_scope == file_scope)
5962 TREE_PUBLIC (decl) = storage_class != csc_static;
5963 TREE_STATIC (decl) = !extern_ref;
5965 /* Not at file scope, only `static' makes a static definition. */
5968 TREE_STATIC (decl) = (storage_class == csc_static);
5969 TREE_PUBLIC (decl) = extern_ref;
5973 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
5976 if ((storage_class == csc_extern
5977 || (storage_class == csc_none
5978 && TREE_CODE (type) == FUNCTION_TYPE
5980 && variably_modified_type_p (type, NULL_TREE))
5983 if (TREE_CODE (type) == FUNCTION_TYPE)
5984 error_at (loc, "non-nested function with variably modified type");
5986 error_at (loc, "object with variably modified type must have "
5990 /* Record `register' declaration for warnings on &
5991 and in case doing stupid register allocation. */
5993 if (storage_class == csc_register)
5995 C_DECL_REGISTER (decl) = 1;
5996 DECL_REGISTER (decl) = 1;
5999 /* Record constancy and volatility. */
6000 c_apply_type_quals_to_decl (type_quals, decl);
6002 /* If a type has volatile components, it should be stored in memory.
6003 Otherwise, the fact that those components are volatile
6004 will be ignored, and would even crash the compiler.
6005 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6006 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
6007 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
6008 || TREE_CODE (decl) == RESULT_DECL))
6010 /* It is not an error for a structure with volatile fields to
6011 be declared register, but reset DECL_REGISTER since it
6012 cannot actually go in a register. */
6013 int was_reg = C_DECL_REGISTER (decl);
6014 C_DECL_REGISTER (decl) = 0;
6015 DECL_REGISTER (decl) = 0;
6016 c_mark_addressable (decl);
6017 C_DECL_REGISTER (decl) = was_reg;
6020 /* This is the earliest point at which we might know the assembler
6021 name of a variable. Thus, if it's known before this, die horribly. */
6022 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
6025 && TREE_CODE (decl) == VAR_DECL
6026 && TREE_PUBLIC (decl)
6027 && TREE_STATIC (decl)
6028 && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
6029 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
6030 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
6031 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
6032 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
6033 ("non-local variable %qD with anonymous type is "
6034 "questionable in C++"),
6041 /* Decode the parameter-list info for a function type or function definition.
6042 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6043 if there is an identifier list instead of a parameter decl list).
6044 These two functions are separate because when a function returns
6045 or receives functions then each is called multiple times but the order
6046 of calls is different. The last call to `grokparms' is always the one
6047 that contains the formal parameter names of a function definition.
6049 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6051 FUNCDEF_FLAG is true for a function definition, false for
6052 a mere declaration. A nonempty identifier-list gets an error message
6053 when FUNCDEF_FLAG is false. */
6056 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
6058 tree arg_types = arg_info->types;
6060 if (funcdef_flag && arg_info->had_vla_unspec)
6062 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6064 error ("%<[*]%> not allowed in other than function prototype scope");
6067 if (arg_types == 0 && !funcdef_flag && !in_system_header)
6068 warning (OPT_Wstrict_prototypes,
6069 "function declaration isn%'t a prototype");
6071 if (arg_types == error_mark_node)
6072 return 0; /* don't set TYPE_ARG_TYPES in this case */
6074 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
6077 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
6079 arg_info->parms = arg_info->types;
6080 arg_info->types = 0;
6085 tree parm, type, typelt;
6086 unsigned int parmno;
6089 /* If there is a parameter of incomplete type in a definition,
6090 this is an error. In a declaration this is valid, and a
6091 struct or union type may be completed later, before any calls
6092 or definition of the function. In the case where the tag was
6093 first declared within the parameter list, a warning has
6094 already been given. If a parameter has void type, then
6095 however the function cannot be defined or called, so
6098 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
6100 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
6102 type = TREE_VALUE (typelt);
6103 if (type == error_mark_node)
6106 if (!COMPLETE_TYPE_P (type))
6110 if (DECL_NAME (parm))
6111 error_at (input_location,
6112 "parameter %u (%q+D) has incomplete type",
6115 error_at (DECL_SOURCE_LOCATION (parm),
6116 "parameter %u has incomplete type",
6119 TREE_VALUE (typelt) = error_mark_node;
6120 TREE_TYPE (parm) = error_mark_node;
6122 else if (VOID_TYPE_P (type))
6124 if (DECL_NAME (parm))
6125 warning_at (input_location, 0,
6126 "parameter %u (%q+D) has void type",
6129 warning_at (DECL_SOURCE_LOCATION (parm), 0,
6130 "parameter %u has void type",
6135 errmsg = targetm.invalid_parameter_type (type);
6139 TREE_VALUE (typelt) = error_mark_node;
6140 TREE_TYPE (parm) = error_mark_node;
6143 if (DECL_NAME (parm) && TREE_USED (parm))
6144 warn_if_shadowing (parm);
6150 /* Take apart the current scope and return a c_arg_info structure with
6151 info on a parameter list just parsed.
6153 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6155 ELLIPSIS being true means the argument list ended in '...' so don't
6156 append a sentinel (void_list_node) to the end of the type-list. */
6159 get_parm_info (bool ellipsis)
6161 struct c_binding *b = current_scope->bindings;
6162 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
6169 static bool explained_incomplete_types = false;
6170 bool gave_void_only_once_err = false;
6172 arg_info->parms = 0;
6174 arg_info->types = 0;
6175 arg_info->others = 0;
6176 arg_info->pending_sizes = 0;
6177 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
6179 /* The bindings in this scope must not get put into a block.
6180 We will take care of deleting the binding nodes. */
6181 current_scope->bindings = 0;
6183 /* This function is only called if there was *something* on the
6187 /* A parameter list consisting solely of 'void' indicates that the
6188 function takes no arguments. But if the 'void' is qualified
6189 (by 'const' or 'volatile'), or has a storage class specifier
6190 ('register'), then the behavior is undefined; issue an error.
6191 Typedefs for 'void' are OK (see DR#157). */
6192 if (b->prev == 0 /* one binding */
6193 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
6194 && !DECL_NAME (b->decl) /* anonymous */
6195 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
6197 if (TREE_THIS_VOLATILE (b->decl)
6198 || TREE_READONLY (b->decl)
6199 || C_DECL_REGISTER (b->decl))
6200 error ("%<void%> as only parameter may not be qualified");
6202 /* There cannot be an ellipsis. */
6204 error ("%<void%> must be the only parameter");
6206 arg_info->types = void_list_node;
6211 types = void_list_node;
6213 /* Break up the bindings list into parms, tags, types, and others;
6214 apply sanity checks; purge the name-to-decl bindings. */
6217 tree decl = b->decl;
6218 tree type = TREE_TYPE (decl);
6219 const char *keyword;
6221 switch (TREE_CODE (decl))
6226 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6227 I_SYMBOL_BINDING (b->id) = b->shadowed;
6230 /* Check for forward decls that never got their actual decl. */
6231 if (TREE_ASM_WRITTEN (decl))
6232 error ("parameter %q+D has just a forward declaration", decl);
6233 /* Check for (..., void, ...) and issue an error. */
6234 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
6236 if (!gave_void_only_once_err)
6238 error ("%<void%> must be the only parameter");
6239 gave_void_only_once_err = true;
6244 /* Valid parameter, add it to the list. */
6245 TREE_CHAIN (decl) = parms;
6248 /* Since there is a prototype, args are passed in their
6249 declared types. The back end may override this later. */
6250 DECL_ARG_TYPE (decl) = type;
6251 types = tree_cons (0, type, types);
6255 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
6256 case UNION_TYPE: keyword = "union"; goto tag;
6257 case RECORD_TYPE: keyword = "struct"; goto tag;
6259 /* Types may not have tag-names, in which case the type
6260 appears in the bindings list with b->id NULL. */
6263 gcc_assert (I_TAG_BINDING (b->id) == b);
6264 I_TAG_BINDING (b->id) = b->shadowed;
6267 /* Warn about any struct, union or enum tags defined in a
6268 parameter list. The scope of such types is limited to
6269 the parameter list, which is rarely if ever desirable
6270 (it's impossible to call such a function with type-
6271 correct arguments). An anonymous union parm type is
6272 meaningful as a GNU extension, so don't warn for that. */
6273 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
6276 /* The %s will be one of 'struct', 'union', or 'enum'. */
6277 warning (0, "%<%s %E%> declared inside parameter list",
6280 /* The %s will be one of 'struct', 'union', or 'enum'. */
6281 warning (0, "anonymous %s declared inside parameter list",
6284 if (!explained_incomplete_types)
6286 warning (0, "its scope is only this definition or declaration,"
6287 " which is probably not what you want");
6288 explained_incomplete_types = true;
6292 tags = tree_cons (b->id, decl, tags);
6298 /* CONST_DECLs appear here when we have an embedded enum,
6299 and TYPE_DECLs appear here when we have an embedded struct
6300 or union. No warnings for this - we already warned about the
6301 type itself. FUNCTION_DECLs appear when there is an implicit
6302 function declaration in the parameter list. */
6304 TREE_CHAIN (decl) = others;
6309 /* error_mark_node appears here when we have an undeclared
6310 variable. Just throw it away. */
6313 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6314 I_SYMBOL_BINDING (b->id) = b->shadowed;
6318 /* Other things that might be encountered. */
6325 b = free_binding_and_advance (b);
6328 arg_info->parms = parms;
6329 arg_info->tags = tags;
6330 arg_info->types = types;
6331 arg_info->others = others;
6332 arg_info->pending_sizes = get_pending_sizes ();
6336 /* Get the struct, enum or union (CODE says which) with tag NAME.
6337 Define the tag as a forward-reference with location LOC if it is
6338 not defined. Return a c_typespec structure for the type
6342 parser_xref_tag (location_t loc, enum tree_code code, tree name)
6344 struct c_typespec ret;
6348 ret.expr = NULL_TREE;
6349 ret.expr_const_operands = true;
6351 /* If a cross reference is requested, look up the type
6352 already defined for this tag and return it. */
6354 ref = lookup_tag (code, name, 0, &refloc);
6355 /* If this is the right type of tag, return what we found.
6356 (This reference will be shadowed by shadow_tag later if appropriate.)
6357 If this is the wrong type of tag, do not return it. If it was the
6358 wrong type in the same scope, we will have had an error
6359 message already; if in a different scope and declaring
6360 a name, pending_xref_error will give an error message; but if in a
6361 different scope and not declaring a name, this tag should
6362 shadow the previous declaration of a different type of tag, and
6363 this would not work properly if we return the reference found.
6364 (For example, with "struct foo" in an outer scope, "union foo;"
6365 must shadow that tag with a new one of union type.) */
6366 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
6367 if (ref && TREE_CODE (ref) == code)
6369 if (C_TYPE_DEFINED_IN_STRUCT (ref)
6370 && loc != UNKNOWN_LOCATION
6376 warning_at (loc, OPT_Wc___compat,
6377 ("enum type defined in struct or union "
6378 "is not visible in C++"));
6379 inform (refloc, "enum type defined here");
6382 warning_at (loc, OPT_Wc___compat,
6383 ("struct defined in struct or union "
6384 "is not visible in C++"));
6385 inform (refloc, "struct defined here");
6388 warning_at (loc, OPT_Wc___compat,
6389 ("union defined in struct or union "
6390 "is not visible in C++"));
6391 inform (refloc, "union defined here");
6402 /* If no such tag is yet defined, create a forward-reference node
6403 and record it as the "definition".
6404 When a real declaration of this type is found,
6405 the forward-reference will be altered into a real type. */
6407 ref = make_node (code);
6408 if (code == ENUMERAL_TYPE)
6410 /* Give the type a default layout like unsigned int
6411 to avoid crashing if it does not get defined. */
6412 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
6413 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
6414 TYPE_USER_ALIGN (ref) = 0;
6415 TYPE_UNSIGNED (ref) = 1;
6416 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
6417 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
6418 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
6421 pushtag (loc, name, ref);
6427 /* Get the struct, enum or union (CODE says which) with tag NAME.
6428 Define the tag as a forward-reference if it is not defined.
6429 Return a tree for the type. */
6432 xref_tag (enum tree_code code, tree name)
6434 return parser_xref_tag (input_location, code, name).spec;
6437 /* Make sure that the tag NAME is defined *in the current scope*
6438 at least as a forward reference.
6439 LOC is the location of the struct's definition.
6440 CODE says which kind of tag NAME ought to be.
6442 This stores the current value of the file static STRUCT_PARSE_INFO
6443 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6444 new c_struct_parse_info structure. The old value of
6445 STRUCT_PARSE_INFO is restored in finish_struct. */
6448 start_struct (location_t loc, enum tree_code code, tree name,
6449 struct c_struct_parse_info **enclosing_struct_parse_info)
6451 /* If there is already a tag defined at this scope
6452 (as a forward reference), just return it. */
6454 tree ref = NULL_TREE;
6455 location_t refloc = UNKNOWN_LOCATION;
6457 if (name != NULL_TREE)
6458 ref = lookup_tag (code, name, 1, &refloc);
6459 if (ref && TREE_CODE (ref) == code)
6461 if (TYPE_SIZE (ref))
6463 if (code == UNION_TYPE)
6464 error_at (loc, "redefinition of %<union %E%>", name);
6466 error_at (loc, "redefinition of %<struct %E%>", name);
6467 if (refloc != UNKNOWN_LOCATION)
6468 inform (refloc, "originally defined here");
6469 /* Don't create structures using a name already in use. */
6472 else if (C_TYPE_BEING_DEFINED (ref))
6474 if (code == UNION_TYPE)
6475 error_at (loc, "nested redefinition of %<union %E%>", name);
6477 error_at (loc, "nested redefinition of %<struct %E%>", name);
6478 /* Don't bother to report "originally defined here" for a
6479 nested redefinition; the original definition should be
6481 /* Don't create structures that contain themselves. */
6486 /* Otherwise create a forward-reference just so the tag is in scope. */
6488 if (ref == NULL_TREE || TREE_CODE (ref) != code)
6490 ref = make_node (code);
6491 pushtag (loc, name, ref);
6494 C_TYPE_BEING_DEFINED (ref) = 1;
6495 TYPE_PACKED (ref) = flag_pack_struct;
6497 *enclosing_struct_parse_info = struct_parse_info;
6498 struct_parse_info = XNEW (struct c_struct_parse_info);
6499 struct_parse_info->struct_types = VEC_alloc (tree, heap, 0);
6500 struct_parse_info->fields = VEC_alloc (c_binding_ptr, heap, 0);
6501 struct_parse_info->typedefs_seen = VEC_alloc (tree, heap, 0);
6503 /* FIXME: This will issue a warning for a use of a type defined
6504 within a statement expr used within sizeof, et. al. This is not
6505 terribly serious as C++ doesn't permit statement exprs within
6507 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
6508 warning_at (loc, OPT_Wc___compat,
6509 "defining type in %qs expression is invalid in C++",
6512 : (in_typeof ? "typeof" : "alignof")));
6517 /* Process the specs, declarator and width (NULL if omitted)
6518 of a structure component, returning a FIELD_DECL node.
6519 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6520 DECL_ATTRS is as for grokdeclarator.
6522 LOC is the location of the structure component.
6524 This is done during the parsing of the struct declaration.
6525 The FIELD_DECL nodes are chained together and the lot of them
6526 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6529 grokfield (location_t loc,
6530 struct c_declarator *declarator, struct c_declspecs *declspecs,
6531 tree width, tree *decl_attrs)
6535 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
6536 && width == NULL_TREE)
6538 /* This is an unnamed decl.
6540 If we have something of the form "union { list } ;" then this
6541 is the anonymous union extension. Similarly for struct.
6543 If this is something of the form "struct foo;", then
6544 If MS extensions are enabled, this is handled as an
6546 Otherwise this is a forward declaration of a structure tag.
6548 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6549 If MS extensions are enabled and foo names a structure, then
6550 again this is an anonymous struct.
6551 Otherwise this is an error.
6553 Oh what a horrid tangled web we weave. I wonder if MS consciously
6554 took this from Plan 9 or if it was an accident of implementation
6555 that took root before someone noticed the bug... */
6557 tree type = declspecs->type;
6558 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
6559 || TREE_CODE (type) == UNION_TYPE);
6563 && (flag_ms_extensions || !declspecs->typedef_p))
6565 if (flag_ms_extensions)
6569 else if (TYPE_NAME (type) == NULL)
6576 pedwarn (loc, 0, "declaration does not declare anything");
6579 pedwarn (loc, OPT_pedantic, "ISO C doesn%'t support unnamed structs/unions");
6582 value = grokdeclarator (declarator, declspecs, FIELD, false,
6583 width ? &width : NULL, decl_attrs, NULL, NULL,
6586 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
6587 DECL_INITIAL (value) = width;
6589 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
6591 /* If we currently have a binding for this field, set the
6592 in_struct field in the binding, so that we warn about lookups
6594 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
6597 /* If the in_struct field is not yet set, push it on a list
6598 to be cleared when this struct is finished. */
6601 VEC_safe_push (c_binding_ptr, heap,
6602 struct_parse_info->fields, b);
6611 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6612 the list such that this does not present a problem later. */
6615 detect_field_duplicates (tree fieldlist)
6620 /* First, see if there are more than "a few" fields.
6621 This is trivially true if there are zero or one fields. */
6624 x = TREE_CHAIN (fieldlist);
6630 } while (timeout > 0 && x);
6632 /* If there were "few" fields, avoid the overhead of allocating
6633 a hash table. Instead just do the nested traversal thing. */
6636 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
6639 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
6640 if (DECL_NAME (y) == DECL_NAME (x))
6642 error ("duplicate member %q+D", x);
6643 DECL_NAME (x) = NULL_TREE;
6649 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
6652 for (x = fieldlist; x ; x = TREE_CHAIN (x))
6653 if ((y = DECL_NAME (x)) != 0)
6655 slot = htab_find_slot (htab, y, INSERT);
6658 error ("duplicate member %q+D", x);
6659 DECL_NAME (x) = NULL_TREE;
6668 /* Finish up struct info used by -Wc++-compat. */
6671 warn_cxx_compat_finish_struct (tree fieldlist)
6675 struct c_binding *b;
6677 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
6678 the current struct. We do this now at the end of the struct
6679 because the flag is used to issue visibility warnings, and we
6680 only want to issue those warnings if the type is referenced
6681 outside of the struct declaration. */
6682 for (ix = 0; VEC_iterate (tree, struct_parse_info->struct_types, ix, x); ++ix)
6683 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
6685 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
6686 typedefs used when declaring fields in this struct. If the name
6687 of any of the fields is also a typedef name then the struct would
6688 not parse in C++, because the C++ lookup rules say that the
6689 typedef name would be looked up in the context of the struct, and
6690 would thus be the field rather than the typedef. */
6691 if (!VEC_empty (tree, struct_parse_info->typedefs_seen)
6692 && fieldlist != NULL_TREE)
6694 /* Use a pointer_set using the name of the typedef. We can use
6695 a pointer_set because identifiers are interned. */
6696 struct pointer_set_t *tset = pointer_set_create ();
6699 VEC_iterate (tree, struct_parse_info->typedefs_seen, ix, x);
6701 pointer_set_insert (tset, DECL_NAME (x));
6703 for (x = fieldlist; x != NULL_TREE; x = TREE_CHAIN (x))
6705 if (pointer_set_contains (tset, DECL_NAME (x)))
6707 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
6708 ("using %qD as both field and typedef name is "
6711 /* FIXME: It would be nice to report the location where
6712 the typedef name is used. */
6716 pointer_set_destroy (tset);
6719 /* For each field which has a binding and which was not defined in
6720 an enclosing struct, clear the in_struct field. */
6722 VEC_iterate (c_binding_ptr, struct_parse_info->fields, ix, b);
6727 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
6728 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
6729 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
6730 ATTRIBUTES are attributes to be applied to the structure.
6732 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
6733 the struct was started. */
6736 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
6737 struct c_struct_parse_info *enclosing_struct_parse_info)
6740 bool toplevel = file_scope == current_scope;
6741 int saw_named_field;
6743 /* If this type was previously laid out as a forward reference,
6744 make sure we lay it out again. */
6748 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
6752 for (x = fieldlist; x; x = TREE_CHAIN (x))
6753 if (DECL_NAME (x) != 0)
6758 if (TREE_CODE (t) == UNION_TYPE)
6761 pedwarn (loc, OPT_pedantic, "union has no named members");
6763 pedwarn (loc, OPT_pedantic, "union has no members");
6768 pedwarn (loc, OPT_pedantic, "struct has no named members");
6770 pedwarn (loc, OPT_pedantic, "struct has no members");
6775 /* Install struct as DECL_CONTEXT of each field decl.
6776 Also process specified field sizes, found in the DECL_INITIAL,
6777 storing 0 there after the type has been changed to precision equal
6778 to its width, rather than the precision of the specified standard
6779 type. (Correct layout requires the original type to have been preserved
6782 saw_named_field = 0;
6783 for (x = fieldlist; x; x = TREE_CHAIN (x))
6785 if (TREE_TYPE (x) == error_mark_node)
6788 DECL_CONTEXT (x) = t;
6790 /* If any field is const, the structure type is pseudo-const. */
6791 if (TREE_READONLY (x))
6792 C_TYPE_FIELDS_READONLY (t) = 1;
6795 /* A field that is pseudo-const makes the structure likewise. */
6796 tree t1 = TREE_TYPE (x);
6797 while (TREE_CODE (t1) == ARRAY_TYPE)
6798 t1 = TREE_TYPE (t1);
6799 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
6800 && C_TYPE_FIELDS_READONLY (t1))
6801 C_TYPE_FIELDS_READONLY (t) = 1;
6804 /* Any field that is volatile means variables of this type must be
6805 treated in some ways as volatile. */
6806 if (TREE_THIS_VOLATILE (x))
6807 C_TYPE_FIELDS_VOLATILE (t) = 1;
6809 /* Any field of nominal variable size implies structure is too. */
6810 if (C_DECL_VARIABLE_SIZE (x))
6811 C_TYPE_VARIABLE_SIZE (t) = 1;
6813 if (DECL_INITIAL (x))
6815 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
6816 DECL_SIZE (x) = bitsize_int (width);
6817 DECL_BIT_FIELD (x) = 1;
6818 SET_DECL_C_BIT_FIELD (x);
6822 && (DECL_BIT_FIELD (x)
6823 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
6824 DECL_PACKED (x) = 1;
6826 /* Detect flexible array member in an invalid context. */
6827 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
6828 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
6829 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
6830 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
6832 if (TREE_CODE (t) == UNION_TYPE)
6834 error_at (DECL_SOURCE_LOCATION (x),
6835 "flexible array member in union");
6836 TREE_TYPE (x) = error_mark_node;
6838 else if (TREE_CHAIN (x) != NULL_TREE)
6840 error_at (DECL_SOURCE_LOCATION (x),
6841 "flexible array member not at end of struct");
6842 TREE_TYPE (x) = error_mark_node;
6844 else if (!saw_named_field)
6846 error_at (DECL_SOURCE_LOCATION (x),
6847 "flexible array member in otherwise empty struct");
6848 TREE_TYPE (x) = error_mark_node;
6852 if (pedantic && TREE_CODE (t) == RECORD_TYPE
6853 && flexible_array_type_p (TREE_TYPE (x)))
6854 pedwarn (DECL_SOURCE_LOCATION (x), OPT_pedantic,
6855 "invalid use of structure with flexible array member");
6858 saw_named_field = 1;
6861 detect_field_duplicates (fieldlist);
6863 /* Now we have the nearly final fieldlist. Record it,
6864 then lay out the structure or union (including the fields). */
6866 TYPE_FIELDS (t) = fieldlist;
6870 /* Give bit-fields their proper types. */
6872 tree *fieldlistp = &fieldlist;
6874 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
6875 && TREE_TYPE (*fieldlistp) != error_mark_node)
6877 unsigned HOST_WIDE_INT width
6878 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
6879 tree type = TREE_TYPE (*fieldlistp);
6880 if (width != TYPE_PRECISION (type))
6882 TREE_TYPE (*fieldlistp)
6883 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
6884 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
6886 DECL_INITIAL (*fieldlistp) = 0;
6889 fieldlistp = &TREE_CHAIN (*fieldlistp);
6892 /* Now we have the truly final field list.
6893 Store it in this type and in the variants. */
6895 TYPE_FIELDS (t) = fieldlist;
6897 /* If there are lots of fields, sort so we can look through them fast.
6898 We arbitrarily consider 16 or more elts to be "a lot". */
6903 for (x = fieldlist; x; x = TREE_CHAIN (x))
6905 if (len > 15 || DECL_NAME (x) == NULL)
6913 struct lang_type *space;
6914 struct sorted_fields_type *space2;
6916 len += list_length (x);
6918 /* Use the same allocation policy here that make_node uses, to
6919 ensure that this lives as long as the rest of the struct decl.
6920 All decls in an inline function need to be saved. */
6922 space = GGC_CNEW (struct lang_type);
6923 space2 = GGC_NEWVAR (struct sorted_fields_type,
6924 sizeof (struct sorted_fields_type) + len * sizeof (tree));
6928 field_array = &space2->elts[0];
6929 for (x = fieldlist; x; x = TREE_CHAIN (x))
6931 field_array[len++] = x;
6933 /* If there is anonymous struct or union, break out of the loop. */
6934 if (DECL_NAME (x) == NULL)
6937 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
6940 TYPE_LANG_SPECIFIC (t) = space;
6941 TYPE_LANG_SPECIFIC (t)->s->len = len;
6942 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
6943 qsort (field_array, len, sizeof (tree), field_decl_cmp);
6948 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
6950 TYPE_FIELDS (x) = TYPE_FIELDS (t);
6951 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
6952 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
6953 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
6954 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
6957 /* If this was supposed to be a transparent union, but we can't
6958 make it one, warn and turn off the flag. */
6959 if (TREE_CODE (t) == UNION_TYPE
6960 && TYPE_TRANSPARENT_AGGR (t)
6961 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
6963 TYPE_TRANSPARENT_AGGR (t) = 0;
6964 warning_at (loc, 0, "union cannot be made transparent");
6967 /* If this structure or union completes the type of any previous
6968 variable declaration, lay it out and output its rtl. */
6969 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
6973 tree decl = TREE_VALUE (x);
6974 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
6975 layout_array_type (TREE_TYPE (decl));
6976 if (TREE_CODE (decl) != TYPE_DECL)
6978 layout_decl (decl, 0);
6979 if (c_dialect_objc ())
6980 objc_check_decl (decl);
6981 rest_of_decl_compilation (decl, toplevel, 0);
6986 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
6988 /* Update type location to the one of the definition, instead of e.g.
6989 a forward declaration. */
6990 if (TYPE_STUB_DECL (t))
6991 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
6993 /* Finish debugging output for this type. */
6994 rest_of_type_compilation (t, toplevel);
6996 /* If we're inside a function proper, i.e. not file-scope and not still
6997 parsing parameters, then arrange for the size of a variable sized type
6999 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
7000 add_stmt (build_stmt (loc,
7001 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
7003 if (warn_cxx_compat)
7004 warn_cxx_compat_finish_struct (fieldlist);
7006 VEC_free (tree, heap, struct_parse_info->struct_types);
7007 VEC_free (c_binding_ptr, heap, struct_parse_info->fields);
7008 VEC_free (tree, heap, struct_parse_info->typedefs_seen);
7009 XDELETE (struct_parse_info);
7011 struct_parse_info = enclosing_struct_parse_info;
7013 /* If this struct is defined inside a struct, add it to
7016 && struct_parse_info != NULL
7017 && !in_sizeof && !in_typeof && !in_alignof)
7018 VEC_safe_push (tree, heap, struct_parse_info->struct_types, t);
7023 /* Lay out the type T, and its element type, and so on. */
7026 layout_array_type (tree t)
7028 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
7029 layout_array_type (TREE_TYPE (t));
7033 /* Begin compiling the definition of an enumeration type.
7034 NAME is its name (or null if anonymous).
7035 LOC is the enum's location.
7036 Returns the type object, as yet incomplete.
7037 Also records info about it so that build_enumerator
7038 may be used to declare the individual values as they are read. */
7041 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
7043 tree enumtype = NULL_TREE;
7044 location_t enumloc = UNKNOWN_LOCATION;
7046 /* If this is the real definition for a previous forward reference,
7047 fill in the contents in the same object that used to be the
7048 forward reference. */
7050 if (name != NULL_TREE)
7051 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc);
7053 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
7055 enumtype = make_node (ENUMERAL_TYPE);
7056 pushtag (loc, name, enumtype);
7059 if (C_TYPE_BEING_DEFINED (enumtype))
7060 error_at (loc, "nested redefinition of %<enum %E%>", name);
7062 C_TYPE_BEING_DEFINED (enumtype) = 1;
7064 if (TYPE_VALUES (enumtype) != 0)
7066 /* This enum is a named one that has been declared already. */
7067 error_at (loc, "redeclaration of %<enum %E%>", name);
7068 if (enumloc != UNKNOWN_LOCATION)
7069 inform (enumloc, "originally defined here");
7071 /* Completely replace its old definition.
7072 The old enumerators remain defined, however. */
7073 TYPE_VALUES (enumtype) = 0;
7076 the_enum->enum_next_value = integer_zero_node;
7077 the_enum->enum_overflow = 0;
7079 if (flag_short_enums)
7080 TYPE_PACKED (enumtype) = 1;
7082 /* FIXME: This will issue a warning for a use of a type defined
7083 within sizeof in a statement expr. This is not terribly serious
7084 as C++ doesn't permit statement exprs within sizeof anyhow. */
7085 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7086 warning_at (loc, OPT_Wc___compat,
7087 "defining type in %qs expression is invalid in C++",
7090 : (in_typeof ? "typeof" : "alignof")));
7095 /* After processing and defining all the values of an enumeration type,
7096 install their decls in the enumeration type and finish it off.
7097 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7098 and ATTRIBUTES are the specified attributes.
7099 Returns ENUMTYPE. */
7102 finish_enum (tree enumtype, tree values, tree attributes)
7105 tree minnode = 0, maxnode = 0;
7106 int precision, unsign;
7107 bool toplevel = (file_scope == current_scope);
7108 struct lang_type *lt;
7110 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7112 /* Calculate the maximum value of any enumerator in this type. */
7114 if (values == error_mark_node)
7115 minnode = maxnode = integer_zero_node;
7118 minnode = maxnode = TREE_VALUE (values);
7119 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
7121 tree value = TREE_VALUE (pair);
7122 if (tree_int_cst_lt (maxnode, value))
7124 if (tree_int_cst_lt (value, minnode))
7129 /* Construct the final type of this enumeration. It is the same
7130 as one of the integral types - the narrowest one that fits, except
7131 that normally we only go as narrow as int - and signed iff any of
7132 the values are negative. */
7133 unsign = (tree_int_cst_sgn (minnode) >= 0);
7134 precision = MAX (tree_int_cst_min_precision (minnode, unsign),
7135 tree_int_cst_min_precision (maxnode, unsign));
7137 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
7139 tem = c_common_type_for_size (precision, unsign);
7142 warning (0, "enumeration values exceed range of largest integer");
7143 tem = long_long_integer_type_node;
7147 tem = unsign ? unsigned_type_node : integer_type_node;
7149 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
7150 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
7151 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
7152 TYPE_SIZE (enumtype) = 0;
7154 /* If the precision of the type was specific with an attribute and it
7155 was too small, give an error. Otherwise, use it. */
7156 if (TYPE_PRECISION (enumtype))
7158 if (precision > TYPE_PRECISION (enumtype))
7159 error ("specified mode too small for enumeral values");
7162 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
7164 layout_type (enumtype);
7166 if (values != error_mark_node)
7168 /* Change the type of the enumerators to be the enum type. We
7169 need to do this irrespective of the size of the enum, for
7170 proper type checking. Replace the DECL_INITIALs of the
7171 enumerators, and the value slots of the list, with copies
7172 that have the enum type; they cannot be modified in place
7173 because they may be shared (e.g. integer_zero_node) Finally,
7174 change the purpose slots to point to the names of the decls. */
7175 for (pair = values; pair; pair = TREE_CHAIN (pair))
7177 tree enu = TREE_PURPOSE (pair);
7178 tree ini = DECL_INITIAL (enu);
7180 TREE_TYPE (enu) = enumtype;
7182 /* The ISO C Standard mandates enumerators to have type int,
7183 even though the underlying type of an enum type is
7184 unspecified. However, GCC allows enumerators of any
7185 integer type as an extensions. build_enumerator()
7186 converts any enumerators that fit in an int to type int,
7187 to avoid promotions to unsigned types when comparing
7188 integers with enumerators that fit in the int range.
7189 When -pedantic is given, build_enumerator() would have
7190 already warned about those that don't fit. Here we
7191 convert the rest to the enumerator type. */
7192 if (TREE_TYPE (ini) != integer_type_node)
7193 ini = convert (enumtype, ini);
7195 DECL_INITIAL (enu) = ini;
7196 TREE_PURPOSE (pair) = DECL_NAME (enu);
7197 TREE_VALUE (pair) = ini;
7200 TYPE_VALUES (enumtype) = values;
7203 /* Record the min/max values so that we can warn about bit-field
7204 enumerations that are too small for the values. */
7205 lt = GGC_CNEW (struct lang_type);
7206 lt->enum_min = minnode;
7207 lt->enum_max = maxnode;
7208 TYPE_LANG_SPECIFIC (enumtype) = lt;
7210 /* Fix up all variant types of this enum type. */
7211 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
7213 if (tem == enumtype)
7215 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
7216 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
7217 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
7218 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
7219 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
7220 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
7221 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
7222 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
7223 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
7224 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
7225 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
7228 /* Finish debugging output for this type. */
7229 rest_of_type_compilation (enumtype, toplevel);
7231 /* If this enum is defined inside a struct, add it to
7234 && struct_parse_info != NULL
7235 && !in_sizeof && !in_typeof && !in_alignof)
7236 VEC_safe_push (tree, heap, struct_parse_info->struct_types, enumtype);
7241 /* Build and install a CONST_DECL for one value of the
7242 current enumeration type (one that was begun with start_enum).
7243 LOC is the location of the enumerator.
7244 Return a tree-list containing the CONST_DECL and its value.
7245 Assignment of sequential values by default is handled here. */
7248 build_enumerator (location_t loc,
7249 struct c_enum_contents *the_enum, tree name, tree value)
7253 /* Validate and default VALUE. */
7257 /* Don't issue more errors for error_mark_node (i.e. an
7258 undeclared identifier) - just ignore the value expression. */
7259 if (value == error_mark_node)
7261 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
7263 error_at (loc, "enumerator value for %qE is not an integer constant",
7269 if (TREE_CODE (value) != INTEGER_CST)
7271 value = c_fully_fold (value, false, NULL);
7272 if (TREE_CODE (value) == INTEGER_CST)
7273 pedwarn (loc, OPT_pedantic,
7274 "enumerator value for %qE is not an integer "
7275 "constant expression", name);
7277 if (TREE_CODE (value) != INTEGER_CST)
7279 error ("enumerator value for %qE is not an integer constant",
7285 value = default_conversion (value);
7286 constant_expression_warning (value);
7291 /* Default based on previous value. */
7292 /* It should no longer be possible to have NON_LVALUE_EXPR
7296 value = the_enum->enum_next_value;
7297 if (the_enum->enum_overflow)
7298 error_at (loc, "overflow in enumeration values");
7300 /* Even though the underlying type of an enum is unspecified, the
7301 type of enumeration constants is explicitly defined as int
7302 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7304 else if (!int_fits_type_p (value, integer_type_node))
7305 pedwarn (loc, OPT_pedantic,
7306 "ISO C restricts enumerator values to range of %<int%>");
7308 /* The ISO C Standard mandates enumerators to have type int, even
7309 though the underlying type of an enum type is unspecified.
7310 However, GCC allows enumerators of any integer type as an
7311 extensions. Here we convert any enumerators that fit in an int
7312 to type int, to avoid promotions to unsigned types when comparing
7313 integers with enumerators that fit in the int range. When
7314 -pedantic is given, we would have already warned about those that
7315 don't fit. We have to do this here rather than in finish_enum
7316 because this value may be used to define more enumerators. */
7317 if (int_fits_type_p (value, integer_type_node))
7318 value = convert (integer_type_node, value);
7320 /* Set basis for default for next value. */
7321 the_enum->enum_next_value
7323 (EXPR_HAS_LOCATION (value) ? EXPR_LOCATION (value) : input_location,
7324 PLUS_EXPR, value, integer_one_node, 0);
7325 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
7327 /* Now create a declaration for the enum value name. */
7329 type = TREE_TYPE (value);
7330 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
7331 TYPE_PRECISION (integer_type_node)),
7332 (TYPE_PRECISION (type)
7333 >= TYPE_PRECISION (integer_type_node)
7334 && TYPE_UNSIGNED (type)));
7336 decl = build_decl (loc, CONST_DECL, name, type);
7337 DECL_INITIAL (decl) = convert (type, value);
7340 return tree_cons (decl, value, NULL_TREE);
7344 /* Create the FUNCTION_DECL for a function definition.
7345 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7346 the declaration; they describe the function's name and the type it returns,
7347 but twisted together in a fashion that parallels the syntax of C.
7349 This function creates a binding context for the function body
7350 as well as setting up the FUNCTION_DECL in current_function_decl.
7352 Returns 1 on success. If the DECLARATOR is not suitable for a function
7353 (it defines a datum instead), we return 0, which tells
7354 yyparse to report a parse error. */
7357 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
7360 tree decl1, old_decl;
7361 tree restype, resdecl;
7364 current_function_returns_value = 0; /* Assume, until we see it does. */
7365 current_function_returns_null = 0;
7366 current_function_returns_abnormally = 0;
7367 warn_about_return_type = 0;
7368 c_switch_stack = NULL;
7370 /* Indicate no valid break/continue context by setting these variables
7371 to some non-null, non-label value. We'll notice and emit the proper
7372 error message in c_finish_bc_stmt. */
7373 c_break_label = c_cont_label = size_zero_node;
7375 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
7376 &attributes, NULL, NULL, DEPRECATED_NORMAL);
7378 /* If the declarator is not suitable for a function definition,
7379 cause a syntax error. */
7383 loc = DECL_SOURCE_LOCATION (decl1);
7385 decl_attributes (&decl1, attributes, 0);
7387 if (DECL_DECLARED_INLINE_P (decl1)
7388 && DECL_UNINLINABLE (decl1)
7389 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
7390 warning_at (loc, OPT_Wattributes,
7391 "inline function %qD given attribute noinline",
7394 /* Handle gnu_inline attribute. */
7395 if (declspecs->inline_p
7396 && !flag_gnu89_inline
7397 && TREE_CODE (decl1) == FUNCTION_DECL
7398 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
7399 || current_function_decl))
7401 if (declspecs->storage_class != csc_static)
7402 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
7405 announce_function (decl1);
7407 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
7409 error_at (loc, "return type is an incomplete type");
7410 /* Make it return void instead. */
7412 = build_function_type (void_type_node,
7413 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
7416 if (warn_about_return_type)
7417 pedwarn_c99 (loc, flag_isoc99 ? 0
7418 : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
7419 "return type defaults to %<int%>");
7421 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7422 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7423 DECL_INITIAL (decl1) = error_mark_node;
7425 /* If this definition isn't a prototype and we had a prototype declaration
7426 before, copy the arg type info from that prototype. */
7427 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
7428 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
7430 current_function_prototype_locus = UNKNOWN_LOCATION;
7431 current_function_prototype_built_in = false;
7432 current_function_prototype_arg_types = NULL_TREE;
7433 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
7435 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
7436 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7437 TREE_TYPE (TREE_TYPE (old_decl))))
7439 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
7441 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
7442 current_function_prototype_built_in
7443 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
7444 current_function_prototype_arg_types
7445 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
7447 if (TREE_PUBLIC (decl1))
7449 /* If there is an external prototype declaration of this
7450 function, record its location but do not copy information
7451 to this decl. This may be an invisible declaration
7452 (built-in or in a scope which has finished) or simply
7453 have more refined argument types than any declaration
7455 struct c_binding *b;
7456 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
7457 if (B_IN_SCOPE (b, external_scope))
7461 tree ext_decl, ext_type;
7463 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
7464 if (TREE_CODE (ext_type) == FUNCTION_TYPE
7465 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7466 TREE_TYPE (ext_type)))
7468 current_function_prototype_locus
7469 = DECL_SOURCE_LOCATION (ext_decl);
7470 current_function_prototype_built_in
7471 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
7472 current_function_prototype_arg_types
7473 = TYPE_ARG_TYPES (ext_type);
7479 /* Optionally warn of old-fashioned def with no previous prototype. */
7480 if (warn_strict_prototypes
7481 && old_decl != error_mark_node
7482 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
7483 && C_DECL_ISNT_PROTOTYPE (old_decl))
7484 warning_at (loc, OPT_Wstrict_prototypes,
7485 "function declaration isn%'t a prototype");
7486 /* Optionally warn of any global def with no previous prototype. */
7487 else if (warn_missing_prototypes
7488 && old_decl != error_mark_node
7489 && TREE_PUBLIC (decl1)
7490 && !MAIN_NAME_P (DECL_NAME (decl1))
7491 && C_DECL_ISNT_PROTOTYPE (old_decl))
7492 warning_at (loc, OPT_Wmissing_prototypes,
7493 "no previous prototype for %qD", decl1);
7494 /* Optionally warn of any def with no previous prototype
7495 if the function has already been used. */
7496 else if (warn_missing_prototypes
7498 && old_decl != error_mark_node
7499 && TREE_USED (old_decl)
7500 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
7501 warning_at (loc, OPT_Wmissing_prototypes,
7502 "%qD was used with no prototype before its definition", decl1);
7503 /* Optionally warn of any global def with no previous declaration. */
7504 else if (warn_missing_declarations
7505 && TREE_PUBLIC (decl1)
7507 && !MAIN_NAME_P (DECL_NAME (decl1)))
7508 warning_at (loc, OPT_Wmissing_declarations,
7509 "no previous declaration for %qD",
7511 /* Optionally warn of any def with no previous declaration
7512 if the function has already been used. */
7513 else if (warn_missing_declarations
7515 && old_decl != error_mark_node
7516 && TREE_USED (old_decl)
7517 && C_DECL_IMPLICIT (old_decl))
7518 warning_at (loc, OPT_Wmissing_declarations,
7519 "%qD was used with no declaration before its definition", decl1);
7521 /* This function exists in static storage.
7522 (This does not mean `static' in the C sense!) */
7523 TREE_STATIC (decl1) = 1;
7525 /* A nested function is not global. */
7526 if (current_function_decl != 0)
7527 TREE_PUBLIC (decl1) = 0;
7529 /* This is the earliest point at which we might know the assembler
7530 name of the function. Thus, if it's set before this, die horribly. */
7531 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
7533 /* If #pragma weak was used, mark the decl weak now. */
7534 if (current_scope == file_scope)
7535 maybe_apply_pragma_weak (decl1);
7537 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7538 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
7540 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
7541 != integer_type_node)
7542 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
7544 check_main_parameter_types (decl1);
7546 if (!TREE_PUBLIC (decl1))
7547 pedwarn (loc, OPT_Wmain,
7548 "%qD is normally a non-static function", decl1);
7551 /* Record the decl so that the function name is defined.
7552 If we already have a decl for this name, and it is a FUNCTION_DECL,
7553 use the old decl. */
7555 current_function_decl = pushdecl (decl1);
7558 declare_parm_level ();
7560 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
7561 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
7562 DECL_ARTIFICIAL (resdecl) = 1;
7563 DECL_IGNORED_P (resdecl) = 1;
7564 DECL_RESULT (current_function_decl) = resdecl;
7566 start_fname_decls ();
7571 /* Subroutine of store_parm_decls which handles new-style function
7572 definitions (prototype format). The parms already have decls, so we
7573 need only record them as in effect and complain if any redundant
7574 old-style parm decls were written. */
7576 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
7580 if (current_scope->bindings)
7582 error_at (DECL_SOURCE_LOCATION (fndecl),
7583 "old-style parameter declarations in prototyped "
7584 "function definition");
7586 /* Get rid of the old-style declarations. */
7590 /* Don't issue this warning for nested functions, and don't issue this
7591 warning if we got here because ARG_INFO_TYPES was error_mark_node
7592 (this happens when a function definition has just an ellipsis in
7593 its parameter list). */
7594 else if (!in_system_header && !current_function_scope
7595 && arg_info->types != error_mark_node)
7596 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
7597 "traditional C rejects ISO C style function definitions");
7599 /* Now make all the parameter declarations visible in the function body.
7600 We can bypass most of the grunt work of pushdecl. */
7601 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
7603 DECL_CONTEXT (decl) = current_function_decl;
7604 if (DECL_NAME (decl))
7606 bind (DECL_NAME (decl), decl, current_scope,
7607 /*invisible=*/false, /*nested=*/false,
7609 if (!TREE_USED (decl))
7610 warn_if_shadowing (decl);
7613 error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted");
7616 /* Record the parameter list in the function declaration. */
7617 DECL_ARGUMENTS (fndecl) = arg_info->parms;
7619 /* Now make all the ancillary declarations visible, likewise. */
7620 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
7622 DECL_CONTEXT (decl) = current_function_decl;
7623 if (DECL_NAME (decl))
7624 bind (DECL_NAME (decl), decl, current_scope,
7625 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
7628 /* And all the tag declarations. */
7629 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
7630 if (TREE_PURPOSE (decl))
7631 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
7632 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
7635 /* Subroutine of store_parm_decls which handles old-style function
7636 definitions (separate parameter list and declarations). */
7639 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
7641 struct c_binding *b;
7642 tree parm, decl, last;
7643 tree parmids = arg_info->parms;
7644 struct pointer_set_t *seen_args = pointer_set_create ();
7646 if (!in_system_header)
7647 warning_at (DECL_SOURCE_LOCATION (fndecl),
7648 OPT_Wold_style_definition, "old-style function definition");
7650 /* Match each formal parameter name with its declaration. Save each
7651 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7652 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
7654 if (TREE_VALUE (parm) == 0)
7656 error_at (DECL_SOURCE_LOCATION (fndecl),
7657 "parameter name missing from parameter list");
7658 TREE_PURPOSE (parm) = 0;
7662 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
7663 if (b && B_IN_CURRENT_SCOPE (b))
7666 /* If we got something other than a PARM_DECL it is an error. */
7667 if (TREE_CODE (decl) != PARM_DECL)
7668 error_at (DECL_SOURCE_LOCATION (decl),
7669 "%qD declared as a non-parameter", decl);
7670 /* If the declaration is already marked, we have a duplicate
7671 name. Complain and ignore the duplicate. */
7672 else if (pointer_set_contains (seen_args, decl))
7674 error_at (DECL_SOURCE_LOCATION (decl),
7675 "multiple parameters named %qD", decl);
7676 TREE_PURPOSE (parm) = 0;
7679 /* If the declaration says "void", complain and turn it into
7681 else if (VOID_TYPE_P (TREE_TYPE (decl)))
7683 error_at (DECL_SOURCE_LOCATION (decl),
7684 "parameter %qD declared with void type", decl);
7685 TREE_TYPE (decl) = integer_type_node;
7686 DECL_ARG_TYPE (decl) = integer_type_node;
7687 layout_decl (decl, 0);
7689 warn_if_shadowing (decl);
7691 /* If no declaration found, default to int. */
7694 /* FIXME diagnostics: This should be the location of the argument,
7695 not the FNDECL. E.g., for an old-style declaration
7697 int f10(v) { blah; }
7699 We should use the location of the V, not the F10.
7700 Unfortunately, the V is an IDENTIFIER_NODE which has no
7701 location. In the future we need locations for c_arg_info
7704 See gcc.dg/Wshadow-3.c for an example of this problem. */
7705 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
7706 PARM_DECL, TREE_VALUE (parm), integer_type_node);
7707 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
7709 warn_if_shadowing (decl);
7712 pedwarn (DECL_SOURCE_LOCATION (decl),
7713 0, "type of %qD defaults to %<int%>", decl);
7715 warning_at (DECL_SOURCE_LOCATION (decl),
7716 OPT_Wmissing_parameter_type,
7717 "type of %qD defaults to %<int%>", decl);
7720 TREE_PURPOSE (parm) = decl;
7721 pointer_set_insert (seen_args, decl);
7724 /* Now examine the parms chain for incomplete declarations
7725 and declarations with no corresponding names. */
7727 for (b = current_scope->bindings; b; b = b->prev)
7730 if (TREE_CODE (parm) != PARM_DECL)
7733 if (TREE_TYPE (parm) != error_mark_node
7734 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
7736 error_at (DECL_SOURCE_LOCATION (parm),
7737 "parameter %qD has incomplete type", parm);
7738 TREE_TYPE (parm) = error_mark_node;
7741 if (!pointer_set_contains (seen_args, parm))
7743 error_at (DECL_SOURCE_LOCATION (parm),
7744 "declaration for parameter %qD but no such parameter",
7747 /* Pretend the parameter was not missing.
7748 This gets us to a standard state and minimizes
7749 further error messages. */
7750 parmids = chainon (parmids, tree_cons (parm, 0, 0));
7754 /* Chain the declarations together in the order of the list of
7755 names. Store that chain in the function decl, replacing the
7756 list of names. Update the current scope to match. */
7757 DECL_ARGUMENTS (fndecl) = 0;
7759 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
7760 if (TREE_PURPOSE (parm))
7762 if (parm && TREE_PURPOSE (parm))
7764 last = TREE_PURPOSE (parm);
7765 DECL_ARGUMENTS (fndecl) = last;
7767 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
7768 if (TREE_PURPOSE (parm))
7770 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7771 last = TREE_PURPOSE (parm);
7773 TREE_CHAIN (last) = 0;
7776 pointer_set_destroy (seen_args);
7778 /* If there was a previous prototype,
7779 set the DECL_ARG_TYPE of each argument according to
7780 the type previously specified, and report any mismatches. */
7782 if (current_function_prototype_arg_types)
7785 for (parm = DECL_ARGUMENTS (fndecl),
7786 type = current_function_prototype_arg_types;
7787 parm || (type && TREE_VALUE (type) != error_mark_node
7788 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
7789 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
7791 if (parm == 0 || type == 0
7792 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
7794 if (current_function_prototype_built_in)
7795 warning_at (DECL_SOURCE_LOCATION (fndecl),
7796 0, "number of arguments doesn%'t match "
7797 "built-in prototype");
7800 /* FIXME diagnostics: This should be the location of
7801 FNDECL, but there is bug when a prototype is
7802 declared inside function context, but defined
7803 outside of it (e.g., gcc.dg/pr15698-2.c). In
7804 which case FNDECL gets the location of the
7805 prototype, not the definition. */
7806 error_at (input_location,
7807 "number of arguments doesn%'t match prototype");
7809 error_at (current_function_prototype_locus,
7810 "prototype declaration");
7814 /* Type for passing arg must be consistent with that
7815 declared for the arg. ISO C says we take the unqualified
7816 type for parameters declared with qualified type. */
7817 if (TREE_TYPE (parm) != error_mark_node
7818 && TREE_TYPE (type) != error_mark_node
7819 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
7820 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
7822 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
7823 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
7825 /* Adjust argument to match prototype. E.g. a previous
7826 `int foo(float);' prototype causes
7827 `int foo(x) float x; {...}' to be treated like
7828 `int foo(float x) {...}'. This is particularly
7829 useful for argument types like uid_t. */
7830 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
7832 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
7833 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
7834 && TYPE_PRECISION (TREE_TYPE (parm))
7835 < TYPE_PRECISION (integer_type_node))
7836 DECL_ARG_TYPE (parm) = integer_type_node;
7838 /* ??? Is it possible to get here with a
7839 built-in prototype or will it always have
7840 been diagnosed as conflicting with an
7841 old-style definition and discarded? */
7842 if (current_function_prototype_built_in)
7843 warning_at (DECL_SOURCE_LOCATION (parm),
7844 OPT_pedantic, "promoted argument %qD "
7845 "doesn%'t match built-in prototype", parm);
7848 pedwarn (DECL_SOURCE_LOCATION (parm),
7849 OPT_pedantic, "promoted argument %qD "
7850 "doesn%'t match prototype", parm);
7851 pedwarn (current_function_prototype_locus, OPT_pedantic,
7852 "prototype declaration");
7857 if (current_function_prototype_built_in)
7858 warning_at (DECL_SOURCE_LOCATION (parm),
7859 0, "argument %qD doesn%'t match "
7860 "built-in prototype", parm);
7863 error_at (DECL_SOURCE_LOCATION (parm),
7864 "argument %qD doesn%'t match prototype", parm);
7865 error_at (current_function_prototype_locus,
7866 "prototype declaration");
7871 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
7874 /* Otherwise, create a prototype that would match. */
7878 tree actual = 0, last = 0, type;
7880 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
7882 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
7884 TREE_CHAIN (last) = type;
7889 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
7891 TREE_CHAIN (last) = type;
7895 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
7896 of the type of this function, but we need to avoid having this
7897 affect the types of other similarly-typed functions, so we must
7898 first force the generation of an identical (but separate) type
7899 node for the relevant function type. The new node we create
7900 will be a variant of the main variant of the original function
7903 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
7905 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
7909 /* Store parameter declarations passed in ARG_INFO into the current
7910 function declaration. */
7913 store_parm_decls_from (struct c_arg_info *arg_info)
7915 current_function_arg_info = arg_info;
7916 store_parm_decls ();
7919 /* Store the parameter declarations into the current function declaration.
7920 This is called after parsing the parameter declarations, before
7921 digesting the body of the function.
7923 For an old-style definition, construct a prototype out of the old-style
7924 parameter declarations and inject it into the function's type. */
7927 store_parm_decls (void)
7929 tree fndecl = current_function_decl;
7932 /* The argument information block for FNDECL. */
7933 struct c_arg_info *arg_info = current_function_arg_info;
7934 current_function_arg_info = 0;
7936 /* True if this definition is written with a prototype. Note:
7937 despite C99 6.7.5.3p14, we can *not* treat an empty argument
7938 list in a function definition as equivalent to (void) -- an
7939 empty argument list specifies the function has no parameters,
7940 but only (void) sets up a prototype for future calls. */
7941 proto = arg_info->types != 0;
7944 store_parm_decls_newstyle (fndecl, arg_info);
7946 store_parm_decls_oldstyle (fndecl, arg_info);
7948 /* The next call to push_scope will be a function body. */
7950 next_is_function_body = true;
7952 /* Write a record describing this function definition to the prototypes
7953 file (if requested). */
7955 gen_aux_info_record (fndecl, 1, 0, proto);
7957 /* Initialize the RTL code for the function. */
7958 allocate_struct_function (fndecl, false);
7960 /* Begin the statement tree for this function. */
7961 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
7963 /* ??? Insert the contents of the pending sizes list into the function
7964 to be evaluated. The only reason left to have this is
7965 void foo(int n, int array[n++])
7966 because we throw away the array type in favor of a pointer type, and
7967 thus won't naturally see the SAVE_EXPR containing the increment. All
7968 other pending sizes would be handled by gimplify_parameters. */
7971 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
7972 add_stmt (TREE_VALUE (t));
7975 /* Even though we're inside a function body, we still don't want to
7976 call expand_expr to calculate the size of a variable-sized array.
7977 We haven't necessarily assigned RTL to all variables yet, so it's
7978 not safe to try to expand expressions involving them. */
7979 cfun->dont_save_pending_sizes_p = 1;
7983 /* Finish up a function declaration and compile that function
7984 all the way to assembler language output. The free the storage
7985 for the function definition.
7987 This is called after parsing the body of the function definition. */
7990 finish_function (void)
7992 tree fndecl = current_function_decl;
7994 if (TREE_CODE (fndecl) == FUNCTION_DECL
7995 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
7997 tree args = DECL_ARGUMENTS (fndecl);
7998 for (; args; args = TREE_CHAIN (args))
8000 tree type = TREE_TYPE (args);
8001 if (INTEGRAL_TYPE_P (type)
8002 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
8003 DECL_ARG_TYPE (args) = integer_type_node;
8007 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
8008 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
8010 /* Must mark the RESULT_DECL as being in this function. */
8012 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
8013 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
8015 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
8016 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
8017 == integer_type_node && flag_isoc99)
8019 /* Hack. We don't want the middle-end to warn that this return
8020 is unreachable, so we mark its location as special. Using
8021 UNKNOWN_LOCATION has the problem that it gets clobbered in
8022 annotate_one_with_locus. A cleaner solution might be to
8023 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8025 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
8028 /* Tie off the statement tree for this function. */
8029 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
8031 finish_fname_decls ();
8033 /* Complain if there's just no return statement. */
8034 if (warn_return_type
8035 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
8036 && !current_function_returns_value && !current_function_returns_null
8037 /* Don't complain if we are no-return. */
8038 && !current_function_returns_abnormally
8039 /* Don't complain if we are declared noreturn. */
8040 && !TREE_THIS_VOLATILE (fndecl)
8041 /* Don't warn for main(). */
8042 && !MAIN_NAME_P (DECL_NAME (fndecl))
8043 /* Or if they didn't actually specify a return type. */
8044 && !C_FUNCTION_IMPLICIT_INT (fndecl)
8045 /* Normally, with -Wreturn-type, flow will complain, but we might
8046 optimize out static functions. */
8047 && !TREE_PUBLIC (fndecl))
8049 warning (OPT_Wreturn_type,
8050 "no return statement in function returning non-void");
8051 TREE_NO_WARNING (fndecl) = 1;
8054 /* Store the end of the function, so that we get good line number
8055 info for the epilogue. */
8056 cfun->function_end_locus = input_location;
8058 /* Finalize the ELF visibility for the function. */
8059 c_determine_visibility (fndecl);
8061 /* For GNU C extern inline functions disregard inline limits. */
8062 if (DECL_EXTERNAL (fndecl)
8063 && DECL_DECLARED_INLINE_P (fndecl))
8064 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
8066 /* Genericize before inlining. Delay genericizing nested functions
8067 until their parent function is genericized. Since finalizing
8068 requires GENERIC, delay that as well. */
8070 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
8071 && !undef_nested_function)
8073 if (!decl_function_context (fndecl))
8075 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
8076 c_genericize (fndecl);
8078 /* ??? Objc emits functions after finalizing the compilation unit.
8079 This should be cleaned up later and this conditional removed. */
8080 if (cgraph_global_info_ready)
8082 cgraph_add_new_function (fndecl, false);
8085 cgraph_finalize_function (fndecl, false);
8089 /* Register this function with cgraph just far enough to get it
8090 added to our parent's nested function list. Handy, since the
8091 C front end doesn't have such a list. */
8092 (void) cgraph_node (fndecl);
8096 if (!decl_function_context (fndecl))
8097 undef_nested_function = false;
8099 /* We're leaving the context of this function, so zap cfun.
8100 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8101 tree_rest_of_compilation. */
8103 current_function_decl = NULL;
8106 /* Check the declarations given in a for-loop for satisfying the C99
8107 constraints. If exactly one such decl is found, return it. LOC is
8108 the location of the opening parenthesis of the for loop. */
8111 check_for_loop_decls (location_t loc)
8113 struct c_binding *b;
8114 tree one_decl = NULL_TREE;
8119 static bool hint = true;
8120 /* If we get here, declarations have been used in a for loop without
8121 the C99 for loop scope. This doesn't make much sense, so don't
8123 error_at (loc, "%<for%> loop initial declarations "
8124 "are only allowed in C99 mode");
8128 "use option -std=c99 or -std=gnu99 to compile your code");
8133 /* C99 subclause 6.8.5 paragraph 3:
8135 [#3] The declaration part of a for statement shall only
8136 declare identifiers for objects having storage class auto or
8139 It isn't clear whether, in this sentence, "identifiers" binds to
8140 "shall only declare" or to "objects" - that is, whether all identifiers
8141 declared must be identifiers for objects, or whether the restriction
8142 only applies to those that are. (A question on this in comp.std.c
8143 in November 2000 received no answer.) We implement the strictest
8144 interpretation, to avoid creating an extension which later causes
8147 for (b = current_scope->bindings; b; b = b->prev)
8150 tree decl = b->decl;
8155 switch (TREE_CODE (decl))
8159 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
8160 if (TREE_STATIC (decl))
8162 "declaration of static variable %qD in %<for%> loop "
8163 "initial declaration", decl);
8164 else if (DECL_EXTERNAL (decl))
8166 "declaration of %<extern%> variable %qD in %<for%> loop "
8167 "initial declaration", decl);
8173 "%<struct %E%> declared in %<for%> loop initial "
8178 "%<union %E%> declared in %<for%> loop initial declaration",
8182 error_at (loc, "%<enum %E%> declared in %<for%> loop "
8183 "initial declaration", id);
8186 error_at (loc, "declaration of non-variable "
8187 "%qD in %<for%> loop initial declaration", decl);
8194 return n_decls == 1 ? one_decl : NULL_TREE;
8197 /* Save and reinitialize the variables
8198 used during compilation of a C function. */
8201 c_push_function_context (void)
8203 struct language_function *p;
8204 p = GGC_NEW (struct language_function);
8207 p->base.x_stmt_tree = c_stmt_tree;
8208 p->x_break_label = c_break_label;
8209 p->x_cont_label = c_cont_label;
8210 p->x_switch_stack = c_switch_stack;
8211 p->arg_info = current_function_arg_info;
8212 p->returns_value = current_function_returns_value;
8213 p->returns_null = current_function_returns_null;
8214 p->returns_abnormally = current_function_returns_abnormally;
8215 p->warn_about_return_type = warn_about_return_type;
8217 push_function_context ();
8220 /* Restore the variables used during compilation of a C function. */
8223 c_pop_function_context (void)
8225 struct language_function *p;
8227 pop_function_context ();
8229 cfun->language = NULL;
8231 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
8232 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
8234 /* Stop pointing to the local nodes about to be freed. */
8235 /* But DECL_INITIAL must remain nonzero so we know this
8236 was an actual function definition. */
8237 DECL_INITIAL (current_function_decl) = error_mark_node;
8238 DECL_ARGUMENTS (current_function_decl) = 0;
8241 c_stmt_tree = p->base.x_stmt_tree;
8242 c_break_label = p->x_break_label;
8243 c_cont_label = p->x_cont_label;
8244 c_switch_stack = p->x_switch_stack;
8245 current_function_arg_info = p->arg_info;
8246 current_function_returns_value = p->returns_value;
8247 current_function_returns_null = p->returns_null;
8248 current_function_returns_abnormally = p->returns_abnormally;
8249 warn_about_return_type = p->warn_about_return_type;
8252 /* The functions below are required for functionality of doing
8253 function at once processing in the C front end. Currently these
8254 functions are not called from anywhere in the C front end, but as
8255 these changes continue, that will change. */
8257 /* Returns the stmt_tree (if any) to which statements are currently
8258 being added. If there is no active statement-tree, NULL is
8262 current_stmt_tree (void)
8264 return &c_stmt_tree;
8267 /* Return the global value of T as a symbol. */
8270 identifier_global_value (tree t)
8272 struct c_binding *b;
8274 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
8275 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
8281 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8282 otherwise the name is found in ridpointers from RID_INDEX. */
8285 record_builtin_type (enum rid rid_index, const char *name, tree type)
8289 id = ridpointers[(int) rid_index];
8291 id = get_identifier (name);
8292 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
8294 if (debug_hooks->type_decl)
8295 debug_hooks->type_decl (decl, false);
8298 /* Build the void_list_node (void_type_node having been created). */
8300 build_void_list_node (void)
8302 tree t = build_tree_list (NULL_TREE, void_type_node);
8306 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8309 build_c_parm (struct c_declspecs *specs, tree attrs,
8310 struct c_declarator *declarator)
8312 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
8315 ret->declarator = declarator;
8319 /* Return a declarator with nested attributes. TARGET is the inner
8320 declarator to which these attributes apply. ATTRS are the
8323 struct c_declarator *
8324 build_attrs_declarator (tree attrs, struct c_declarator *target)
8326 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8327 ret->kind = cdk_attrs;
8328 ret->declarator = target;
8329 ret->u.attrs = attrs;
8333 /* Return a declarator for a function with arguments specified by ARGS
8334 and return type specified by TARGET. */
8336 struct c_declarator *
8337 build_function_declarator (struct c_arg_info *args,
8338 struct c_declarator *target)
8340 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8341 ret->kind = cdk_function;
8342 ret->declarator = target;
8343 ret->u.arg_info = args;
8347 /* Return a declarator for the identifier IDENT (which may be
8348 NULL_TREE for an abstract declarator). */
8350 struct c_declarator *
8351 build_id_declarator (tree ident)
8353 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8355 ret->declarator = 0;
8357 /* Default value - may get reset to a more precise location. */
8358 ret->id_loc = input_location;
8362 /* Return something to represent absolute declarators containing a *.
8363 TARGET is the absolute declarator that the * contains.
8364 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8365 to apply to the pointer type. */
8367 struct c_declarator *
8368 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
8369 struct c_declarator *target)
8373 struct c_declarator *itarget = target;
8374 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8375 if (type_quals_attrs)
8377 attrs = type_quals_attrs->attrs;
8378 quals = quals_from_declspecs (type_quals_attrs);
8379 if (attrs != NULL_TREE)
8380 itarget = build_attrs_declarator (attrs, target);
8382 ret->kind = cdk_pointer;
8383 ret->declarator = itarget;
8384 ret->u.pointer_quals = quals;
8388 /* Return a pointer to a structure for an empty list of declaration
8391 struct c_declspecs *
8392 build_null_declspecs (void)
8394 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
8399 ret->typespec_word = cts_none;
8400 ret->storage_class = csc_none;
8401 ret->expr_const_operands = true;
8402 ret->declspecs_seen_p = false;
8403 ret->type_seen_p = false;
8404 ret->non_sc_seen_p = false;
8405 ret->typedef_p = false;
8406 ret->tag_defined_p = false;
8407 ret->explicit_signed_p = false;
8408 ret->deprecated_p = false;
8409 ret->default_int_p = false;
8410 ret->long_p = false;
8411 ret->long_long_p = false;
8412 ret->short_p = false;
8413 ret->signed_p = false;
8414 ret->unsigned_p = false;
8415 ret->complex_p = false;
8416 ret->inline_p = false;
8417 ret->thread_p = false;
8418 ret->const_p = false;
8419 ret->volatile_p = false;
8420 ret->restrict_p = false;
8421 ret->saturating_p = false;
8422 ret->address_space = ADDR_SPACE_GENERIC;
8426 /* Add the address space ADDRSPACE to the declaration specifiers
8427 SPECS, returning SPECS. */
8429 struct c_declspecs *
8430 declspecs_add_addrspace (struct c_declspecs *specs, addr_space_t as)
8432 specs->non_sc_seen_p = true;
8433 specs->declspecs_seen_p = true;
8435 if (!ADDR_SPACE_GENERIC_P (specs->address_space)
8436 && specs->address_space != as)
8437 error ("incompatible address space qualifiers %qs and %qs",
8438 c_addr_space_name (as),
8439 c_addr_space_name (specs->address_space));
8441 specs->address_space = as;
8445 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8448 struct c_declspecs *
8449 declspecs_add_qual (struct c_declspecs *specs, tree qual)
8453 specs->non_sc_seen_p = true;
8454 specs->declspecs_seen_p = true;
8455 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
8456 && C_IS_RESERVED_WORD (qual));
8457 i = C_RID_CODE (qual);
8461 dupe = specs->const_p;
8462 specs->const_p = true;
8465 dupe = specs->volatile_p;
8466 specs->volatile_p = true;
8469 dupe = specs->restrict_p;
8470 specs->restrict_p = true;
8475 if (dupe && !flag_isoc99)
8476 pedwarn (input_location, OPT_pedantic, "duplicate %qE", qual);
8480 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8483 struct c_declspecs *
8484 declspecs_add_type (location_t loc, struct c_declspecs *specs,
8485 struct c_typespec spec)
8487 tree type = spec.spec;
8488 specs->non_sc_seen_p = true;
8489 specs->declspecs_seen_p = true;
8490 specs->type_seen_p = true;
8491 if (TREE_DEPRECATED (type))
8492 specs->deprecated_p = true;
8494 /* Handle type specifier keywords. */
8495 if (TREE_CODE (type) == IDENTIFIER_NODE
8496 && C_IS_RESERVED_WORD (type)
8497 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
8499 enum rid i = C_RID_CODE (type);
8502 error_at (loc, "two or more data types in declaration specifiers");
8505 if ((int) i <= (int) RID_LAST_MODIFIER)
8507 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8512 if (specs->long_long_p)
8514 error_at (loc, "%<long long long%> is too long for GCC");
8519 if (specs->typespec_word == cts_double)
8522 ("both %<long long%> and %<double%> in "
8523 "declaration specifiers"));
8526 pedwarn_c90 (loc, OPT_Wlong_long,
8527 "ISO C90 does not support %<long long%>");
8528 specs->long_long_p = 1;
8533 ("both %<long%> and %<short%> in "
8534 "declaration specifiers"));
8535 else if (specs->typespec_word == cts_void)
8537 ("both %<long%> and %<void%> in "
8538 "declaration specifiers"));
8539 else if (specs->typespec_word == cts_bool)
8541 ("both %<long%> and %<_Bool%> in "
8542 "declaration specifiers"));
8543 else if (specs->typespec_word == cts_char)
8545 ("both %<long%> and %<char%> in "
8546 "declaration specifiers"));
8547 else if (specs->typespec_word == cts_float)
8549 ("both %<long%> and %<float%> in "
8550 "declaration specifiers"));
8551 else if (specs->typespec_word == cts_dfloat32)
8553 ("both %<long%> and %<_Decimal32%> in "
8554 "declaration specifiers"));
8555 else if (specs->typespec_word == cts_dfloat64)
8557 ("both %<long%> and %<_Decimal64%> in "
8558 "declaration specifiers"));
8559 else if (specs->typespec_word == cts_dfloat128)
8561 ("both %<long%> and %<_Decimal128%> in "
8562 "declaration specifiers"));
8564 specs->long_p = true;
8567 dupe = specs->short_p;
8570 ("both %<long%> and %<short%> in "
8571 "declaration specifiers"));
8572 else if (specs->typespec_word == cts_void)
8574 ("both %<short%> and %<void%> in "
8575 "declaration specifiers"));
8576 else if (specs->typespec_word == cts_bool)
8578 ("both %<short%> and %<_Bool%> in "
8579 "declaration specifiers"));
8580 else if (specs->typespec_word == cts_char)
8582 ("both %<short%> and %<char%> in "
8583 "declaration specifiers"));
8584 else if (specs->typespec_word == cts_float)
8586 ("both %<short%> and %<float%> in "
8587 "declaration specifiers"));
8588 else if (specs->typespec_word == cts_double)
8590 ("both %<short%> and %<double%> in "
8591 "declaration specifiers"));
8592 else if (specs->typespec_word == cts_dfloat32)
8594 ("both %<short%> and %<_Decimal32%> in "
8595 "declaration specifiers"));
8596 else if (specs->typespec_word == cts_dfloat64)
8598 ("both %<short%> and %<_Decimal64%> in "
8599 "declaration specifiers"));
8600 else if (specs->typespec_word == cts_dfloat128)
8602 ("both %<short%> and %<_Decimal128%> in "
8603 "declaration specifiers"));
8605 specs->short_p = true;
8608 dupe = specs->signed_p;
8609 if (specs->unsigned_p)
8611 ("both %<signed%> and %<unsigned%> in "
8612 "declaration specifiers"));
8613 else if (specs->typespec_word == cts_void)
8615 ("both %<signed%> and %<void%> in "
8616 "declaration specifiers"));
8617 else if (specs->typespec_word == cts_bool)
8619 ("both %<signed%> and %<_Bool%> in "
8620 "declaration specifiers"));
8621 else if (specs->typespec_word == cts_float)
8623 ("both %<signed%> and %<float%> in "
8624 "declaration specifiers"));
8625 else if (specs->typespec_word == cts_double)
8627 ("both %<signed%> and %<double%> in "
8628 "declaration specifiers"));
8629 else if (specs->typespec_word == cts_dfloat32)
8631 ("both %<signed%> and %<_Decimal32%> in "
8632 "declaration specifiers"));
8633 else if (specs->typespec_word == cts_dfloat64)
8635 ("both %<signed%> and %<_Decimal64%> in "
8636 "declaration specifiers"));
8637 else if (specs->typespec_word == cts_dfloat128)
8639 ("both %<signed%> and %<_Decimal128%> in "
8640 "declaration specifiers"));
8642 specs->signed_p = true;
8645 dupe = specs->unsigned_p;
8646 if (specs->signed_p)
8648 ("both %<signed%> and %<unsigned%> in "
8649 "declaration specifiers"));
8650 else if (specs->typespec_word == cts_void)
8652 ("both %<unsigned%> and %<void%> in "
8653 "declaration specifiers"));
8654 else if (specs->typespec_word == cts_bool)
8656 ("both %<unsigned%> and %<_Bool%> in "
8657 "declaration specifiers"));
8658 else if (specs->typespec_word == cts_float)
8660 ("both %<unsigned%> and %<float%> in "
8661 "declaration specifiers"));
8662 else if (specs->typespec_word == cts_double)
8664 ("both %<unsigned%> and %<double%> in "
8665 "declaration specifiers"));
8666 else if (specs->typespec_word == cts_dfloat32)
8668 ("both %<unsigned%> and %<_Decimal32%> in "
8669 "declaration specifiers"));
8670 else if (specs->typespec_word == cts_dfloat64)
8672 ("both %<unsigned%> and %<_Decimal64%> in "
8673 "declaration specifiers"));
8674 else if (specs->typespec_word == cts_dfloat128)
8676 ("both %<unsigned%> and %<_Decimal128%> in "
8677 "declaration specifiers"));
8679 specs->unsigned_p = true;
8682 dupe = specs->complex_p;
8683 if (!flag_isoc99 && !in_system_header)
8684 pedwarn (loc, OPT_pedantic,
8685 "ISO C90 does not support complex types");
8686 if (specs->typespec_word == cts_void)
8688 ("both %<complex%> and %<void%> in "
8689 "declaration specifiers"));
8690 else if (specs->typespec_word == cts_bool)
8692 ("both %<complex%> and %<_Bool%> in "
8693 "declaration specifiers"));
8694 else if (specs->typespec_word == cts_dfloat32)
8696 ("both %<complex%> and %<_Decimal32%> in "
8697 "declaration specifiers"));
8698 else if (specs->typespec_word == cts_dfloat64)
8700 ("both %<complex%> and %<_Decimal64%> in "
8701 "declaration specifiers"));
8702 else if (specs->typespec_word == cts_dfloat128)
8704 ("both %<complex%> and %<_Decimal128%> in "
8705 "declaration specifiers"));
8706 else if (specs->typespec_word == cts_fract)
8708 ("both %<complex%> and %<_Fract%> in "
8709 "declaration specifiers"));
8710 else if (specs->typespec_word == cts_accum)
8712 ("both %<complex%> and %<_Accum%> in "
8713 "declaration specifiers"));
8714 else if (specs->saturating_p)
8716 ("both %<complex%> and %<_Sat%> in "
8717 "declaration specifiers"));
8719 specs->complex_p = true;
8722 dupe = specs->saturating_p;
8723 pedwarn (loc, OPT_pedantic,
8724 "ISO C does not support saturating types");
8725 if (specs->typespec_word == cts_void)
8727 ("both %<_Sat%> and %<void%> in "
8728 "declaration specifiers"));
8729 else if (specs->typespec_word == cts_bool)
8731 ("both %<_Sat%> and %<_Bool%> in "
8732 "declaration specifiers"));
8733 else if (specs->typespec_word == cts_char)
8735 ("both %<_Sat%> and %<char%> in "
8736 "declaration specifiers"));
8737 else if (specs->typespec_word == cts_int)
8739 ("both %<_Sat%> and %<int%> in "
8740 "declaration specifiers"));
8741 else if (specs->typespec_word == cts_float)
8743 ("both %<_Sat%> and %<float%> in "
8744 "declaration specifiers"));
8745 else if (specs->typespec_word == cts_double)
8747 ("both %<_Sat%> and %<double%> in "
8748 "declaration specifiers"));
8749 else if (specs->typespec_word == cts_dfloat32)
8751 ("both %<_Sat%> and %<_Decimal32%> in "
8752 "declaration specifiers"));
8753 else if (specs->typespec_word == cts_dfloat64)
8755 ("both %<_Sat%> and %<_Decimal64%> in "
8756 "declaration specifiers"));
8757 else if (specs->typespec_word == cts_dfloat128)
8759 ("both %<_Sat%> and %<_Decimal128%> in "
8760 "declaration specifiers"));
8761 else if (specs->complex_p)
8763 ("both %<_Sat%> and %<complex%> in "
8764 "declaration specifiers"));
8766 specs->saturating_p = true;
8773 error_at (loc, "duplicate %qE", type);
8779 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
8780 "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
8781 if (specs->typespec_word != cts_none)
8784 "two or more data types in declaration specifiers");
8792 ("both %<long%> and %<void%> in "
8793 "declaration specifiers"));
8794 else if (specs->short_p)
8796 ("both %<short%> and %<void%> in "
8797 "declaration specifiers"));
8798 else if (specs->signed_p)
8800 ("both %<signed%> and %<void%> in "
8801 "declaration specifiers"));
8802 else if (specs->unsigned_p)
8804 ("both %<unsigned%> and %<void%> in "
8805 "declaration specifiers"));
8806 else if (specs->complex_p)
8808 ("both %<complex%> and %<void%> in "
8809 "declaration specifiers"));
8810 else if (specs->saturating_p)
8812 ("both %<_Sat%> and %<void%> in "
8813 "declaration specifiers"));
8815 specs->typespec_word = cts_void;
8820 ("both %<long%> and %<_Bool%> in "
8821 "declaration specifiers"));
8822 else if (specs->short_p)
8824 ("both %<short%> and %<_Bool%> in "
8825 "declaration specifiers"));
8826 else if (specs->signed_p)
8828 ("both %<signed%> and %<_Bool%> in "
8829 "declaration specifiers"));
8830 else if (specs->unsigned_p)
8832 ("both %<unsigned%> and %<_Bool%> in "
8833 "declaration specifiers"));
8834 else if (specs->complex_p)
8836 ("both %<complex%> and %<_Bool%> in "
8837 "declaration specifiers"));
8838 else if (specs->saturating_p)
8840 ("both %<_Sat%> and %<_Bool%> in "
8841 "declaration specifiers"));
8843 specs->typespec_word = cts_bool;
8848 ("both %<long%> and %<char%> in "
8849 "declaration specifiers"));
8850 else if (specs->short_p)
8852 ("both %<short%> and %<char%> in "
8853 "declaration specifiers"));
8854 else if (specs->saturating_p)
8856 ("both %<_Sat%> and %<char%> in "
8857 "declaration specifiers"));
8859 specs->typespec_word = cts_char;
8862 if (specs->saturating_p)
8864 ("both %<_Sat%> and %<int%> in "
8865 "declaration specifiers"));
8867 specs->typespec_word = cts_int;
8872 ("both %<long%> and %<float%> in "
8873 "declaration specifiers"));
8874 else if (specs->short_p)
8876 ("both %<short%> and %<float%> in "
8877 "declaration specifiers"));
8878 else if (specs->signed_p)
8880 ("both %<signed%> and %<float%> in "
8881 "declaration specifiers"));
8882 else if (specs->unsigned_p)
8884 ("both %<unsigned%> and %<float%> in "
8885 "declaration specifiers"));
8886 else if (specs->saturating_p)
8888 ("both %<_Sat%> and %<float%> in "
8889 "declaration specifiers"));
8891 specs->typespec_word = cts_float;
8894 if (specs->long_long_p)
8896 ("both %<long long%> and %<double%> in "
8897 "declaration specifiers"));
8898 else if (specs->short_p)
8900 ("both %<short%> and %<double%> in "
8901 "declaration specifiers"));
8902 else if (specs->signed_p)
8904 ("both %<signed%> and %<double%> in "
8905 "declaration specifiers"));
8906 else if (specs->unsigned_p)
8908 ("both %<unsigned%> and %<double%> in "
8909 "declaration specifiers"));
8910 else if (specs->saturating_p)
8912 ("both %<_Sat%> and %<double%> in "
8913 "declaration specifiers"));
8915 specs->typespec_word = cts_double;
8922 if (i == RID_DFLOAT32)
8924 else if (i == RID_DFLOAT64)
8927 str = "_Decimal128";
8928 if (specs->long_long_p)
8930 ("both %<long long%> and %<%s%> in "
8931 "declaration specifiers"),
8935 ("both %<long%> and %<%s%> in "
8936 "declaration specifiers"),
8938 else if (specs->short_p)
8940 ("both %<short%> and %<%s%> in "
8941 "declaration specifiers"),
8943 else if (specs->signed_p)
8945 ("both %<signed%> and %<%s%> in "
8946 "declaration specifiers"),
8948 else if (specs->unsigned_p)
8950 ("both %<unsigned%> and %<%s%> in "
8951 "declaration specifiers"),
8953 else if (specs->complex_p)
8955 ("both %<complex%> and %<%s%> in "
8956 "declaration specifiers"),
8958 else if (specs->saturating_p)
8960 ("both %<_Sat%> and %<%s%> in "
8961 "declaration specifiers"),
8963 else if (i == RID_DFLOAT32)
8964 specs->typespec_word = cts_dfloat32;
8965 else if (i == RID_DFLOAT64)
8966 specs->typespec_word = cts_dfloat64;
8968 specs->typespec_word = cts_dfloat128;
8970 if (!targetm.decimal_float_supported_p ())
8972 ("decimal floating point not supported "
8973 "for this target"));
8974 pedwarn (loc, OPT_pedantic,
8975 "ISO C does not support decimal floating point");
8985 if (specs->complex_p)
8987 ("both %<complex%> and %<%s%> in "
8988 "declaration specifiers"),
8990 else if (i == RID_FRACT)
8991 specs->typespec_word = cts_fract;
8993 specs->typespec_word = cts_accum;
8995 if (!targetm.fixed_point_supported_p ())
8997 "fixed-point types not supported for this target");
8998 pedwarn (loc, OPT_pedantic,
8999 "ISO C does not support fixed-point types");
9002 /* ObjC reserved word "id", handled below. */
9008 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9009 form of ObjC type, cases such as "int" and "long" being handled
9010 above), a TYPE (struct, union, enum and typeof specifiers) or an
9011 ERROR_MARK. In none of these cases may there have previously
9012 been any type specifiers. */
9013 if (specs->type || specs->typespec_word != cts_none
9014 || specs->long_p || specs->short_p || specs->signed_p
9015 || specs->unsigned_p || specs->complex_p)
9016 error_at (loc, "two or more data types in declaration specifiers");
9017 else if (TREE_CODE (type) == TYPE_DECL)
9019 if (TREE_TYPE (type) == error_mark_node)
9020 ; /* Allow the type to default to int to avoid cascading errors. */
9023 specs->type = TREE_TYPE (type);
9024 specs->decl_attr = DECL_ATTRIBUTES (type);
9025 specs->typedef_p = true;
9026 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
9028 /* If this typedef name is defined in a struct, then a C++
9029 lookup would return a different value. */
9031 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
9032 warning_at (loc, OPT_Wc___compat,
9033 "C++ lookup of %qD would return a field, not a type",
9036 /* If we are parsing a struct, record that a struct field
9038 if (warn_cxx_compat && struct_parse_info != NULL)
9039 VEC_safe_push (tree, heap, struct_parse_info->typedefs_seen, type);
9042 else if (TREE_CODE (type) == IDENTIFIER_NODE)
9044 tree t = lookup_name (type);
9045 if (!t || TREE_CODE (t) != TYPE_DECL)
9046 error_at (loc, "%qE fails to be a typedef or built in type", type);
9047 else if (TREE_TYPE (t) == error_mark_node)
9050 specs->type = TREE_TYPE (t);
9052 else if (TREE_CODE (type) != ERROR_MARK)
9054 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
9055 specs->tag_defined_p = true;
9056 if (spec.kind == ctsk_typeof)
9058 specs->typedef_p = true;
9062 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
9063 specs->expr, spec.expr);
9065 specs->expr = spec.expr;
9066 specs->expr_const_operands &= spec.expr_const_operands;
9075 /* Add the storage class specifier or function specifier SCSPEC to the
9076 declaration specifiers SPECS, returning SPECS. */
9078 struct c_declspecs *
9079 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
9082 enum c_storage_class n = csc_none;
9084 specs->declspecs_seen_p = true;
9085 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
9086 && C_IS_RESERVED_WORD (scspec));
9087 i = C_RID_CODE (scspec);
9088 if (specs->non_sc_seen_p)
9089 warning (OPT_Wold_style_declaration,
9090 "%qE is not at beginning of declaration", scspec);
9094 /* C99 permits duplicate inline. Although of doubtful utility,
9095 it seems simplest to permit it in gnu89 mode as well, as
9096 there is also little utility in maintaining this as a
9097 difference between gnu89 and C99 inline. */
9099 specs->inline_p = true;
9102 dupe = specs->thread_p;
9103 if (specs->storage_class == csc_auto)
9104 error ("%<__thread%> used with %<auto%>");
9105 else if (specs->storage_class == csc_register)
9106 error ("%<__thread%> used with %<register%>");
9107 else if (specs->storage_class == csc_typedef)
9108 error ("%<__thread%> used with %<typedef%>");
9110 specs->thread_p = true;
9117 /* Diagnose "__thread extern". */
9118 if (specs->thread_p)
9119 error ("%<__thread%> before %<extern%>");
9126 /* Diagnose "__thread static". */
9127 if (specs->thread_p)
9128 error ("%<__thread%> before %<static%>");
9136 if (n != csc_none && n == specs->storage_class)
9139 error ("duplicate %qE", scspec);
9142 if (specs->storage_class != csc_none && n != specs->storage_class)
9144 error ("multiple storage classes in declaration specifiers");
9148 specs->storage_class = n;
9149 if (n != csc_extern && n != csc_static && specs->thread_p)
9151 error ("%<__thread%> used with %qE", scspec);
9152 specs->thread_p = false;
9159 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9162 struct c_declspecs *
9163 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
9165 specs->attrs = chainon (attrs, specs->attrs);
9166 specs->declspecs_seen_p = true;
9170 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9171 specifiers with any other type specifier to determine the resulting
9172 type. This is where ISO C checks on complex types are made, since
9173 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9176 struct c_declspecs *
9177 finish_declspecs (struct c_declspecs *specs)
9179 /* If a type was specified as a whole, we have no modifiers and are
9181 if (specs->type != NULL_TREE)
9183 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
9184 && !specs->signed_p && !specs->unsigned_p
9185 && !specs->complex_p);
9189 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9190 has been specified, treat it as "int" unless "_Complex" is
9191 present and there are no other specifiers. If we just have
9192 "_Complex", it is equivalent to "_Complex double", but e.g.
9193 "_Complex short" is equivalent to "_Complex short int". */
9194 if (specs->typespec_word == cts_none)
9196 if (specs->saturating_p)
9198 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9199 if (!targetm.fixed_point_supported_p ())
9200 error ("fixed-point types not supported for this target");
9201 specs->typespec_word = cts_fract;
9203 else if (specs->long_p || specs->short_p
9204 || specs->signed_p || specs->unsigned_p)
9206 specs->typespec_word = cts_int;
9208 else if (specs->complex_p)
9210 specs->typespec_word = cts_double;
9211 pedwarn (input_location, OPT_pedantic,
9212 "ISO C does not support plain %<complex%> meaning "
9213 "%<double complex%>");
9217 specs->typespec_word = cts_int;
9218 specs->default_int_p = true;
9219 /* We don't diagnose this here because grokdeclarator will
9220 give more specific diagnostics according to whether it is
9221 a function definition. */
9225 /* If "signed" was specified, record this to distinguish "int" and
9226 "signed int" in the case of a bit-field with
9227 -funsigned-bitfields. */
9228 specs->explicit_signed_p = specs->signed_p;
9230 /* Now compute the actual type. */
9231 switch (specs->typespec_word)
9234 gcc_assert (!specs->long_p && !specs->short_p
9235 && !specs->signed_p && !specs->unsigned_p
9236 && !specs->complex_p);
9237 specs->type = void_type_node;
9240 gcc_assert (!specs->long_p && !specs->short_p
9241 && !specs->signed_p && !specs->unsigned_p
9242 && !specs->complex_p);
9243 specs->type = boolean_type_node;
9246 gcc_assert (!specs->long_p && !specs->short_p);
9247 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9248 if (specs->signed_p)
9249 specs->type = signed_char_type_node;
9250 else if (specs->unsigned_p)
9251 specs->type = unsigned_char_type_node;
9253 specs->type = char_type_node;
9254 if (specs->complex_p)
9256 pedwarn (input_location, OPT_pedantic,
9257 "ISO C does not support complex integer types");
9258 specs->type = build_complex_type (specs->type);
9262 gcc_assert (!(specs->long_p && specs->short_p));
9263 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9264 if (specs->long_long_p)
9265 specs->type = (specs->unsigned_p
9266 ? long_long_unsigned_type_node
9267 : long_long_integer_type_node);
9268 else if (specs->long_p)
9269 specs->type = (specs->unsigned_p
9270 ? long_unsigned_type_node
9271 : long_integer_type_node);
9272 else if (specs->short_p)
9273 specs->type = (specs->unsigned_p
9274 ? short_unsigned_type_node
9275 : short_integer_type_node);
9277 specs->type = (specs->unsigned_p
9278 ? unsigned_type_node
9279 : integer_type_node);
9280 if (specs->complex_p)
9282 pedwarn (input_location, OPT_pedantic,
9283 "ISO C does not support complex integer types");
9284 specs->type = build_complex_type (specs->type);
9288 gcc_assert (!specs->long_p && !specs->short_p
9289 && !specs->signed_p && !specs->unsigned_p);
9290 specs->type = (specs->complex_p
9291 ? complex_float_type_node
9295 gcc_assert (!specs->long_long_p && !specs->short_p
9296 && !specs->signed_p && !specs->unsigned_p);
9299 specs->type = (specs->complex_p
9300 ? complex_long_double_type_node
9301 : long_double_type_node);
9305 specs->type = (specs->complex_p
9306 ? complex_double_type_node
9307 : double_type_node);
9313 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
9314 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
9315 if (specs->typespec_word == cts_dfloat32)
9316 specs->type = dfloat32_type_node;
9317 else if (specs->typespec_word == cts_dfloat64)
9318 specs->type = dfloat64_type_node;
9320 specs->type = dfloat128_type_node;
9323 gcc_assert (!specs->complex_p);
9324 if (!targetm.fixed_point_supported_p ())
9325 specs->type = integer_type_node;
9326 else if (specs->saturating_p)
9328 if (specs->long_long_p)
9329 specs->type = specs->unsigned_p
9330 ? sat_unsigned_long_long_fract_type_node
9331 : sat_long_long_fract_type_node;
9332 else if (specs->long_p)
9333 specs->type = specs->unsigned_p
9334 ? sat_unsigned_long_fract_type_node
9335 : sat_long_fract_type_node;
9336 else if (specs->short_p)
9337 specs->type = specs->unsigned_p
9338 ? sat_unsigned_short_fract_type_node
9339 : sat_short_fract_type_node;
9341 specs->type = specs->unsigned_p
9342 ? sat_unsigned_fract_type_node
9343 : sat_fract_type_node;
9347 if (specs->long_long_p)
9348 specs->type = specs->unsigned_p
9349 ? unsigned_long_long_fract_type_node
9350 : long_long_fract_type_node;
9351 else if (specs->long_p)
9352 specs->type = specs->unsigned_p
9353 ? unsigned_long_fract_type_node
9354 : long_fract_type_node;
9355 else if (specs->short_p)
9356 specs->type = specs->unsigned_p
9357 ? unsigned_short_fract_type_node
9358 : short_fract_type_node;
9360 specs->type = specs->unsigned_p
9361 ? unsigned_fract_type_node
9366 gcc_assert (!specs->complex_p);
9367 if (!targetm.fixed_point_supported_p ())
9368 specs->type = integer_type_node;
9369 else if (specs->saturating_p)
9371 if (specs->long_long_p)
9372 specs->type = specs->unsigned_p
9373 ? sat_unsigned_long_long_accum_type_node
9374 : sat_long_long_accum_type_node;
9375 else if (specs->long_p)
9376 specs->type = specs->unsigned_p
9377 ? sat_unsigned_long_accum_type_node
9378 : sat_long_accum_type_node;
9379 else if (specs->short_p)
9380 specs->type = specs->unsigned_p
9381 ? sat_unsigned_short_accum_type_node
9382 : sat_short_accum_type_node;
9384 specs->type = specs->unsigned_p
9385 ? sat_unsigned_accum_type_node
9386 : sat_accum_type_node;
9390 if (specs->long_long_p)
9391 specs->type = specs->unsigned_p
9392 ? unsigned_long_long_accum_type_node
9393 : long_long_accum_type_node;
9394 else if (specs->long_p)
9395 specs->type = specs->unsigned_p
9396 ? unsigned_long_accum_type_node
9397 : long_accum_type_node;
9398 else if (specs->short_p)
9399 specs->type = specs->unsigned_p
9400 ? unsigned_short_accum_type_node
9401 : short_accum_type_node;
9403 specs->type = specs->unsigned_p
9404 ? unsigned_accum_type_node
9415 /* A subroutine of c_write_global_declarations. Perform final processing
9416 on one file scope's declarations (or the external scope's declarations),
9420 c_write_global_declarations_1 (tree globals)
9425 /* Process the decls in the order they were written. */
9426 for (decl = globals; decl; decl = TREE_CHAIN (decl))
9428 /* Check for used but undefined static functions using the C
9429 standard's definition of "used", and set TREE_NO_WARNING so
9430 that check_global_declarations doesn't repeat the check. */
9431 if (TREE_CODE (decl) == FUNCTION_DECL
9432 && DECL_INITIAL (decl) == 0
9433 && DECL_EXTERNAL (decl)
9434 && !TREE_PUBLIC (decl)
9435 && C_DECL_USED (decl))
9437 pedwarn (input_location, 0, "%q+F used but never defined", decl);
9438 TREE_NO_WARNING (decl) = 1;
9441 wrapup_global_declaration_1 (decl);
9447 for (decl = globals; decl; decl = TREE_CHAIN (decl))
9448 reconsider |= wrapup_global_declaration_2 (decl);
9452 for (decl = globals; decl; decl = TREE_CHAIN (decl))
9453 check_global_declaration_1 (decl);
9456 /* A subroutine of c_write_global_declarations Emit debug information for each
9457 of the declarations in GLOBALS. */
9460 c_write_global_declarations_2 (tree globals)
9464 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
9465 debug_hooks->global_decl (decl);
9468 /* Preserve the external declarations scope across a garbage collect. */
9469 static GTY(()) tree ext_block;
9472 c_write_global_declarations (void)
9476 /* We don't want to do this if generating a PCH. */
9480 /* Don't waste time on further processing if -fsyntax-only.
9481 Continue for warning and errors issued during lowering though. */
9482 if (flag_syntax_only)
9485 /* Close the external scope. */
9486 ext_block = pop_scope ();
9488 gcc_assert (!current_scope);
9492 tree tmp = BLOCK_VARS (ext_block);
9494 FILE * stream = dump_begin (TDI_tu, &flags);
9497 dump_node (tmp, flags & ~TDF_SLIM, stream);
9498 dump_end (TDI_tu, stream);
9502 /* Process all file scopes in this compilation, and the external_scope,
9503 through wrapup_global_declarations and check_global_declarations. */
9504 for (t = all_translation_units; t; t = TREE_CHAIN (t))
9505 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
9506 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
9508 /* We're done parsing; proceed to optimize and emit assembly.
9509 FIXME: shouldn't be the front end's responsibility to call this. */
9510 cgraph_finalize_compilation_unit ();
9512 /* After cgraph has had a chance to emit everything that's going to
9513 be emitted, output debug information for globals. */
9514 if (errorcount == 0 && sorrycount == 0)
9516 timevar_push (TV_SYMOUT);
9517 for (t = all_translation_units; t; t = TREE_CHAIN (t))
9518 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
9519 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
9520 timevar_pop (TV_SYMOUT);
9526 #include "gt-c-decl.h"