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"
52 #include "langhooks.h"
53 #include "tree-mudflap.h"
54 #include "tree-iterator.h"
55 #include "diagnostic.h"
56 #include "tree-dump.h"
59 #include "langhooks-def.h"
60 #include "pointer-set.h"
63 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
65 { NORMAL, /* Ordinary declaration */
66 FUNCDEF, /* Function definition */
67 PARM, /* Declaration of parm before function body */
68 FIELD, /* Declaration inside struct or union */
69 TYPENAME}; /* Typename (inside cast or sizeof) */
71 /* States indicating how grokdeclarator() should handle declspecs marked
72 with __attribute__((deprecated)). An object declared as
73 __attribute__((deprecated)) suppresses warnings of uses of other
76 enum deprecated_states {
82 /* Nonzero if we have seen an invalid cross reference
83 to a struct, union, or enum, but not yet printed the message. */
84 tree pending_invalid_xref;
86 /* File and line to appear in the eventual error message. */
87 location_t pending_invalid_xref_location;
89 /* The file and line that the prototype came from if this is an
90 old-style definition; used for diagnostics in
91 store_parm_decls_oldstyle. */
93 static location_t current_function_prototype_locus;
95 /* Whether this prototype was built-in. */
97 static bool current_function_prototype_built_in;
99 /* The argument type information of this prototype. */
101 static tree current_function_prototype_arg_types;
103 /* The argument information structure for the function currently being
106 static struct c_arg_info *current_function_arg_info;
108 /* The obstack on which parser and related data structures, which are
109 not live beyond their top-level declaration or definition, are
111 struct obstack parser_obstack;
113 /* The current statement tree. */
115 static GTY(()) struct stmt_tree_s c_stmt_tree;
117 /* State saving variables. */
121 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
122 included in this invocation. Note that the current translation
123 unit is not included in this list. */
125 static GTY(()) tree all_translation_units;
127 /* A list of decls to be made automatically visible in each file scope. */
128 static GTY(()) tree visible_builtins;
130 /* Set to 0 at beginning of a function definition, set to 1 if
131 a return statement that specifies a return value is seen. */
133 int current_function_returns_value;
135 /* Set to 0 at beginning of a function definition, set to 1 if
136 a return statement with no argument is seen. */
138 int current_function_returns_null;
140 /* Set to 0 at beginning of a function definition, set to 1 if
141 a call to a noreturn function is seen. */
143 int current_function_returns_abnormally;
145 /* Set to nonzero by `grokdeclarator' for a function
146 whose return type is defaulted, if warnings for this are desired. */
148 static int warn_about_return_type;
150 /* Nonzero when the current toplevel function contains a declaration
151 of a nested function which is never defined. */
153 static bool undef_nested_function;
155 /* True means global_bindings_p should return false even if the scope stack
156 says we are in file scope. */
157 bool c_override_global_bindings_to_false;
160 /* Each c_binding structure describes one binding of an identifier to
161 a decl. All the decls in a scope - irrespective of namespace - are
162 chained together by the ->prev field, which (as the name implies)
163 runs in reverse order. All the decls in a given namespace bound to
164 a given identifier are chained by the ->shadowed field, which runs
165 from inner to outer scopes.
167 The ->decl field usually points to a DECL node, but there are two
168 exceptions. In the namespace of type tags, the bound entity is a
169 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
170 identifier is encountered, it is bound to error_mark_node to
171 suppress further errors about that identifier in the current
174 The ->u.type field stores the type of the declaration in this scope;
175 if NULL, the type is the type of the ->decl field. This is only of
176 relevance for objects with external or internal linkage which may
177 be redeclared in inner scopes, forming composite types that only
178 persist for the duration of those scopes. In the external scope,
179 this stores the composite of all the types declared for this
180 object, visible or not. The ->inner_comp field (used only at file
181 scope) stores whether an incomplete array type at file scope was
182 completed at an inner scope to an array size other than 1.
184 The ->u.label field is used for labels. It points to a structure
185 which stores additional information used for warnings.
187 The depth field is copied from the scope structure that holds this
188 decl. It is used to preserve the proper ordering of the ->shadowed
189 field (see bind()) and also for a handful of special-case checks.
190 Finally, the invisible bit is true for a decl which should be
191 ignored for purposes of normal name lookup, and the nested bit is
192 true for a decl that's been bound a second time in an inner scope;
193 in all such cases, the binding in the outer scope will have its
194 invisible bit true. */
196 struct GTY((chain_next ("%h.prev"))) c_binding {
197 union GTY(()) { /* first so GTY desc can use decl */
198 tree GTY((tag ("0"))) type; /* the type in this scope */
199 struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */
200 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u;
201 tree decl; /* the decl bound */
202 tree id; /* the identifier it's bound to */
203 struct c_binding *prev; /* the previous decl in this scope */
204 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
205 unsigned int depth : 28; /* depth of this scope */
206 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
207 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
208 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
209 BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */
210 location_t locus; /* location for nested bindings */
212 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
213 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
214 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
215 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
217 #define I_SYMBOL_BINDING(node) \
218 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
219 #define I_SYMBOL_DECL(node) \
220 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
222 #define I_TAG_BINDING(node) \
223 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
224 #define I_TAG_DECL(node) \
225 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
227 #define I_LABEL_BINDING(node) \
228 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
229 #define I_LABEL_DECL(node) \
230 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
232 /* Each C symbol points to three linked lists of c_binding structures.
233 These describe the values of the identifier in the three different
234 namespaces defined by the language. */
236 struct GTY(()) lang_identifier {
237 struct c_common_identifier common_id;
238 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
239 struct c_binding *tag_binding; /* struct/union/enum tags */
240 struct c_binding *label_binding; /* labels */
243 /* Validate c-lang.c's assumptions. */
244 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
245 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
247 /* The resulting tree type. */
249 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
250 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
252 union tree_node GTY ((tag ("0"),
253 desc ("tree_node_structure (&%h)")))
255 struct lang_identifier GTY ((tag ("1"))) identifier;
258 /* Track bindings and other things that matter for goto warnings. For
259 efficiency, we do not gather all the decls at the point of
260 definition. Instead, we point into the bindings structure. As
261 scopes are popped, we update these structures and gather the decls
262 that matter at that time. */
264 struct GTY(()) c_spot_bindings {
265 /* The currently open scope which holds bindings defined when the
266 label was defined or the goto statement was found. */
267 struct c_scope *scope;
268 /* The bindings in the scope field which were defined at the point
269 of the label or goto. This lets us look at older or newer
270 bindings in the scope, as appropriate. */
271 struct c_binding *bindings_in_scope;
272 /* The number of statement expressions that have started since this
273 label or goto statement was defined. This is zero if we are at
274 the same statement expression level. It is positive if we are in
275 a statement expression started since this spot. It is negative
276 if this spot was in a statement expression and we have left
279 /* Whether we started in a statement expression but are no longer in
280 it. This is set to true if stmt_exprs ever goes negative. */
284 /* This structure is used to keep track of bindings seen when a goto
285 statement is defined. This is only used if we see the goto
286 statement before we see the label. */
288 struct GTY(()) c_goto_bindings {
289 /* The location of the goto statement. */
291 /* The bindings of the goto statement. */
292 struct c_spot_bindings goto_bindings;
295 typedef struct c_goto_bindings *c_goto_bindings_p;
296 DEF_VEC_P(c_goto_bindings_p);
297 DEF_VEC_ALLOC_P(c_goto_bindings_p,gc);
299 /* The additional information we keep track of for a label binding.
300 These fields are updated as scopes are popped. */
302 struct GTY(()) c_label_vars {
303 /* The shadowed c_label_vars, when one label shadows another (which
304 can only happen using a __label__ declaration). */
305 struct c_label_vars *shadowed;
306 /* The bindings when the label was defined. */
307 struct c_spot_bindings label_bindings;
308 /* A list of decls that we care about: decls about which we should
309 warn if a goto branches to this label from later in the function.
310 Decls are added to this list as scopes are popped. We only add
311 the decls that matter. */
312 VEC(tree,gc) *decls_in_scope;
313 /* A list of goto statements to this label. This is only used for
314 goto statements seen before the label was defined, so that we can
315 issue appropriate warnings for them. */
316 VEC(c_goto_bindings_p,gc) *gotos;
319 /* Each c_scope structure describes the complete contents of one
320 scope. Four scopes are distinguished specially: the innermost or
321 current scope, the innermost function scope, the file scope (always
322 the second to outermost) and the outermost or external scope.
324 Most declarations are recorded in the current scope.
326 All normal label declarations are recorded in the innermost
327 function scope, as are bindings of undeclared identifiers to
328 error_mark_node. (GCC permits nested functions as an extension,
329 hence the 'innermost' qualifier.) Explicitly declared labels
330 (using the __label__ extension) appear in the current scope.
332 Being in the file scope (current_scope == file_scope) causes
333 special behavior in several places below. Also, under some
334 conditions the Objective-C front end records declarations in the
335 file scope even though that isn't the current scope.
337 All declarations with external linkage are recorded in the external
338 scope, even if they aren't visible there; this models the fact that
339 such declarations are visible to the entire program, and (with a
340 bit of cleverness, see pushdecl) allows diagnosis of some violations
341 of C99 6.2.2p7 and 6.2.7p2:
343 If, within the same translation unit, the same identifier appears
344 with both internal and external linkage, the behavior is
347 All declarations that refer to the same object or function shall
348 have compatible type; otherwise, the behavior is undefined.
350 Initially only the built-in declarations, which describe compiler
351 intrinsic functions plus a subset of the standard library, are in
354 The order of the blocks list matters, and it is frequently appended
355 to. To avoid having to walk all the way to the end of the list on
356 each insertion, or reverse the list later, we maintain a pointer to
357 the last list entry. (FIXME: It should be feasible to use a reversed
360 The bindings list is strictly in reverse order of declarations;
361 pop_scope relies on this. */
364 struct GTY((chain_next ("%h.outer"))) c_scope {
365 /* The scope containing this one. */
366 struct c_scope *outer;
368 /* The next outermost function scope. */
369 struct c_scope *outer_function;
371 /* All bindings in this scope. */
372 struct c_binding *bindings;
374 /* For each scope (except the global one), a chain of BLOCK nodes
375 for all the scopes that were entered and exited one level down. */
379 /* The depth of this scope. Used to keep the ->shadowed chain of
380 bindings sorted innermost to outermost. */
381 unsigned int depth : 28;
383 /* True if we are currently filling this scope with parameter
385 BOOL_BITFIELD parm_flag : 1;
387 /* True if we saw [*] in this scope. Used to give an error messages
388 if these appears in a function definition. */
389 BOOL_BITFIELD had_vla_unspec : 1;
391 /* True if we already complained about forward parameter decls
392 in this scope. This prevents double warnings on
393 foo (int a; int b; ...) */
394 BOOL_BITFIELD warned_forward_parm_decls : 1;
396 /* True if this is the outermost block scope of a function body.
397 This scope contains the parameters, the local variables declared
398 in the outermost block, and all the labels (except those in
399 nested functions, or declared at block scope with __label__). */
400 BOOL_BITFIELD function_body : 1;
402 /* True means make a BLOCK for this scope no matter what. */
403 BOOL_BITFIELD keep : 1;
405 /* True means that an unsuffixed float constant is _Decimal64. */
406 BOOL_BITFIELD float_const_decimal64 : 1;
408 /* True if this scope has any label bindings. This is used to speed
409 up searching for labels when popping scopes, particularly since
410 labels are normally only found at function scope. */
411 BOOL_BITFIELD has_label_bindings : 1;
414 /* The scope currently in effect. */
416 static GTY(()) struct c_scope *current_scope;
418 /* The innermost function scope. Ordinary (not explicitly declared)
419 labels, bindings to error_mark_node, and the lazily-created
420 bindings of __func__ and its friends get this scope. */
422 static GTY(()) struct c_scope *current_function_scope;
424 /* The C file scope. This is reset for each input translation unit. */
426 static GTY(()) struct c_scope *file_scope;
428 /* The outermost scope. This is used for all declarations with
429 external linkage, and only these, hence the name. */
431 static GTY(()) struct c_scope *external_scope;
433 /* A chain of c_scope structures awaiting reuse. */
435 static GTY((deletable)) struct c_scope *scope_freelist;
437 /* A chain of c_binding structures awaiting reuse. */
439 static GTY((deletable)) struct c_binding *binding_freelist;
441 /* Append VAR to LIST in scope SCOPE. */
442 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
443 struct c_scope *s_ = (scope); \
445 if (s_->list##_last) \
446 BLOCK_CHAIN (s_->list##_last) = d_; \
449 s_->list##_last = d_; \
452 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
453 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
454 struct c_scope *t_ = (tscope); \
455 struct c_scope *f_ = (fscope); \
457 BLOCK_CHAIN (t_->to##_last) = f_->from; \
460 t_->to##_last = f_->from##_last; \
463 /* A c_inline_static structure stores details of a static identifier
464 referenced in a definition of a function that may be an inline
465 definition if no subsequent declaration of that function uses
466 "extern" or does not use "inline". */
468 struct GTY((chain_next ("%h.next"))) c_inline_static {
469 /* The location for a diagnostic. */
472 /* The function that may be an inline definition. */
475 /* The object or function referenced. */
478 /* What sort of reference this is. */
479 enum c_inline_static_type type;
481 /* The next such structure or NULL. */
482 struct c_inline_static *next;
485 /* List of static identifiers used or referenced in functions that may
486 be inline definitions. */
487 static GTY(()) struct c_inline_static *c_inline_statics;
489 /* True means unconditionally make a BLOCK for the next scope pushed. */
491 static bool keep_next_level_flag;
493 /* True means the next call to push_scope will be the outermost scope
494 of a function body, so do not push a new scope, merely cease
495 expecting parameter decls. */
497 static bool next_is_function_body;
499 /* A VEC of pointers to c_binding structures. */
501 typedef struct c_binding *c_binding_ptr;
502 DEF_VEC_P(c_binding_ptr);
503 DEF_VEC_ALLOC_P(c_binding_ptr,heap);
505 /* Information that we keep for a struct or union while it is being
508 struct c_struct_parse_info
510 /* If warn_cxx_compat, a list of types defined within this
512 VEC(tree,heap) *struct_types;
513 /* If warn_cxx_compat, a list of field names which have bindings,
514 and which are defined in this struct, but which are not defined
515 in any enclosing struct. This is used to clear the in_struct
516 field of the c_bindings structure. */
517 VEC(c_binding_ptr,heap) *fields;
518 /* If warn_cxx_compat, a list of typedef names used when defining
519 fields in this struct. */
520 VEC(tree,heap) *typedefs_seen;
523 /* Information for the struct or union currently being parsed, or
524 NULL if not parsing a struct or union. */
525 static struct c_struct_parse_info *struct_parse_info;
527 /* Forward declarations. */
528 static tree lookup_name_in_scope (tree, struct c_scope *);
529 static tree c_make_fname_decl (location_t, tree, int);
530 static tree grokdeclarator (const struct c_declarator *,
531 struct c_declspecs *,
532 enum decl_context, bool, tree *, tree *, tree *,
533 bool *, enum deprecated_states);
534 static tree grokparms (struct c_arg_info *, bool);
535 static void layout_array_type (tree);
537 /* T is a statement. Add it to the statement-tree. This is the
538 C/ObjC version--C++ has a slightly different version of this
544 enum tree_code code = TREE_CODE (t);
546 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
548 if (!EXPR_HAS_LOCATION (t))
549 SET_EXPR_LOCATION (t, input_location);
552 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
553 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
555 /* Add T to the statement-tree. Non-side-effect statements need to be
556 recorded during statement expressions. */
557 append_to_statement_list_force (t, &cur_stmt_list);
564 c_print_identifier (FILE *file, tree node, int indent)
566 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
567 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
568 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
569 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
571 tree rid = ridpointers[C_RID_CODE (node)];
572 indent_to (file, indent + 4);
573 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
574 (void *) rid, IDENTIFIER_POINTER (rid));
578 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
579 which may be any of several kinds of DECL or TYPE or error_mark_node,
580 in the scope SCOPE. */
582 bind (tree name, tree decl, struct c_scope *scope, bool invisible,
583 bool nested, location_t locus)
585 struct c_binding *b, **here;
587 if (binding_freelist)
589 b = binding_freelist;
590 binding_freelist = b->prev;
593 b = GGC_NEW (struct c_binding);
598 b->depth = scope->depth;
599 b->invisible = invisible;
607 b->prev = scope->bindings;
613 switch (TREE_CODE (decl))
615 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
618 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
624 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
630 /* Locate the appropriate place in the chain of shadowed decls
631 to insert this binding. Normally, scope == current_scope and
632 this does nothing. */
633 while (*here && (*here)->depth > scope->depth)
634 here = &(*here)->shadowed;
640 /* Clear the binding structure B, stick it on the binding_freelist,
641 and return the former value of b->prev. This is used by pop_scope
642 and get_parm_info to iterate destructively over all the bindings
643 from a given scope. */
644 static struct c_binding *
645 free_binding_and_advance (struct c_binding *b)
647 struct c_binding *prev = b->prev;
649 memset (b, 0, sizeof (struct c_binding));
650 b->prev = binding_freelist;
651 binding_freelist = b;
656 /* Bind a label. Like bind, but skip fields which aren't used for
657 labels, and add the LABEL_VARS value. */
659 bind_label (tree name, tree label, struct c_scope *scope,
660 struct c_label_vars *label_vars)
664 bind (name, label, scope, /*invisible=*/false, /*nested=*/false,
667 scope->has_label_bindings = true;
670 gcc_assert (b->decl == label);
671 label_vars->shadowed = b->u.label;
672 b->u.label = label_vars;
675 /* Hook called at end of compilation to assume 1 elt
676 for a file-scope tentative array defn that wasn't complete before. */
679 c_finish_incomplete_decl (tree decl)
681 if (TREE_CODE (decl) == VAR_DECL)
683 tree type = TREE_TYPE (decl);
684 if (type != error_mark_node
685 && TREE_CODE (type) == ARRAY_TYPE
686 && !DECL_EXTERNAL (decl)
687 && TYPE_DOMAIN (type) == 0)
689 warning_at (DECL_SOURCE_LOCATION (decl),
690 0, "array %q+D assumed to have one element", decl);
692 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
694 layout_decl (decl, 0);
699 /* Record that inline function FUNC contains a reference (location
700 LOC) to static DECL (file-scope or function-local according to
704 record_inline_static (location_t loc, tree func, tree decl,
705 enum c_inline_static_type type)
707 struct c_inline_static *csi = GGC_NEW (struct c_inline_static);
709 csi->function = func;
710 csi->static_decl = decl;
712 csi->next = c_inline_statics;
713 c_inline_statics = csi;
716 /* Check for references to static declarations in inline functions at
717 the end of the translation unit and diagnose them if the functions
718 are still inline definitions. */
721 check_inline_statics (void)
723 struct c_inline_static *csi;
724 for (csi = c_inline_statics; csi; csi = csi->next)
726 if (DECL_EXTERNAL (csi->function))
730 pedwarn (csi->location, 0,
731 "%qD is static but used in inline function %qD "
732 "which is not static", csi->static_decl, csi->function);
735 pedwarn (csi->location, 0,
736 "%q+D is static but declared in inline function %qD "
737 "which is not static", csi->static_decl, csi->function);
743 c_inline_statics = NULL;
746 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
747 for the current state, otherwise set it to uninitialized. */
750 set_spot_bindings (struct c_spot_bindings *p, bool defining)
754 p->scope = current_scope;
755 p->bindings_in_scope = current_scope->bindings;
760 p->bindings_in_scope = NULL;
763 p->left_stmt_expr = false;
766 /* Return true if we will want to say something if a goto statement
770 decl_jump_unsafe (tree decl)
772 if (decl == error_mark_node || TREE_TYPE (decl) == error_mark_node)
775 /* Always warn about crossing variably modified types. */
776 if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == TYPE_DECL)
777 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
780 /* Otherwise, only warn if -Wgoto-misses-init and this is an
781 initialized automatic decl. */
782 if (warn_jump_misses_init
783 && TREE_CODE (decl) == VAR_DECL
784 && !TREE_STATIC (decl)
785 && DECL_INITIAL (decl) != NULL_TREE)
791 /* Update spot bindings P as we pop out of SCOPE. Return true if we
792 should push decls for a label. */
795 update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p)
797 if (p->scope != scope)
799 /* This label or goto is defined in some other scope, or it is a
800 label which is not yet defined. There is nothing to
805 /* Adjust the spot bindings to refer to the bindings already defined
806 in the enclosing scope. */
807 p->scope = scope->outer;
808 p->bindings_in_scope = p->scope->bindings;
813 /* The Objective-C front-end often needs to determine the current scope. */
816 objc_get_current_scope (void)
818 return current_scope;
821 /* The following function is used only by Objective-C. It needs to live here
822 because it accesses the innards of c_scope. */
825 objc_mark_locals_volatile (void *enclosing_blk)
827 struct c_scope *scope;
830 for (scope = current_scope;
831 scope && scope != enclosing_blk;
832 scope = scope->outer)
834 for (b = scope->bindings; b; b = b->prev)
835 objc_volatilize_decl (b->decl);
837 /* Do not climb up past the current function. */
838 if (scope->function_body)
843 /* Nonzero if we are currently in file scope. */
846 global_bindings_p (void)
848 return (current_scope == file_scope && !c_override_global_bindings_to_false
854 keep_next_level (void)
856 keep_next_level_flag = true;
859 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
862 set_float_const_decimal64 (void)
864 current_scope->float_const_decimal64 = true;
867 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
870 clear_float_const_decimal64 (void)
872 current_scope->float_const_decimal64 = false;
875 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
878 float_const_decimal64_p (void)
880 return current_scope->float_const_decimal64;
883 /* Identify this scope as currently being filled with parameters. */
886 declare_parm_level (void)
888 current_scope->parm_flag = true;
894 if (next_is_function_body)
896 /* This is the transition from the parameters to the top level
897 of the function body. These are the same scope
898 (C99 6.2.1p4,6) so we do not push another scope structure.
899 next_is_function_body is set only by store_parm_decls, which
900 in turn is called when and only when we are about to
901 encounter the opening curly brace for the function body.
903 The outermost block of a function always gets a BLOCK node,
904 because the debugging output routines expect that each
905 function has at least one BLOCK. */
906 current_scope->parm_flag = false;
907 current_scope->function_body = true;
908 current_scope->keep = true;
909 current_scope->outer_function = current_function_scope;
910 current_function_scope = current_scope;
912 keep_next_level_flag = false;
913 next_is_function_body = false;
915 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
916 if (current_scope->outer)
917 current_scope->float_const_decimal64
918 = current_scope->outer->float_const_decimal64;
920 current_scope->float_const_decimal64 = false;
924 struct c_scope *scope;
927 scope = scope_freelist;
928 scope_freelist = scope->outer;
931 scope = GGC_CNEW (struct c_scope);
933 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
935 scope->float_const_decimal64 = current_scope->float_const_decimal64;
937 scope->float_const_decimal64 = false;
939 scope->keep = keep_next_level_flag;
940 scope->outer = current_scope;
941 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
943 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
945 if (current_scope && scope->depth == 0)
948 sorry ("GCC supports only %u nested scopes", scope->depth);
951 current_scope = scope;
952 keep_next_level_flag = false;
956 /* This is called when we are leaving SCOPE. For each label defined
957 in SCOPE, add any appropriate decls to its decls_in_scope fields.
958 These are the decls whose initialization will be skipped by a goto
959 later in the function. */
962 update_label_decls (struct c_scope *scope)
969 if (s->has_label_bindings)
973 for (b = s->bindings; b != NULL; b = b->prev)
975 struct c_label_vars *label_vars;
976 struct c_binding *b1;
978 struct c_goto_bindings *g;
980 if (TREE_CODE (b->decl) != LABEL_DECL)
982 label_vars = b->u.label;
984 b1 = label_vars->label_bindings.bindings_in_scope;
985 if (update_spot_bindings (scope, &label_vars->label_bindings))
987 /* This label is defined in this scope. */
988 for (; b1 != NULL; b1 = b1->prev)
990 /* A goto from later in the function to this
991 label will never see the initialization of
992 B1, if any. Save it to issue a warning if
994 if (decl_jump_unsafe (b1->decl))
995 VEC_safe_push (tree, gc, label_vars->decls_in_scope,
1000 /* Update the bindings of any goto statements associated
1003 VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g);
1005 update_spot_bindings (scope, &g->goto_bindings);
1009 /* Don't search beyond the current function. */
1010 if (s == current_function_scope)
1017 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1020 set_type_context (tree type, tree context)
1022 for (type = TYPE_MAIN_VARIANT (type); type;
1023 type = TYPE_NEXT_VARIANT (type))
1024 TYPE_CONTEXT (type) = context;
1027 /* Exit a scope. Restore the state of the identifier-decl mappings
1028 that were in effect when this scope was entered. Return a BLOCK
1029 node containing all the DECLs in this scope that are of interest
1030 to debug info generation. */
1035 struct c_scope *scope = current_scope;
1036 tree block, context, p;
1037 struct c_binding *b;
1039 bool functionbody = scope->function_body;
1040 bool keep = functionbody || scope->keep || scope->bindings;
1042 update_label_decls (scope);
1044 /* If appropriate, create a BLOCK to record the decls for the life
1045 of this function. */
1049 block = make_node (BLOCK);
1050 BLOCK_SUBBLOCKS (block) = scope->blocks;
1051 TREE_USED (block) = 1;
1053 /* In each subblock, record that this is its superior. */
1054 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
1055 BLOCK_SUPERCONTEXT (p) = block;
1057 BLOCK_VARS (block) = 0;
1060 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1061 scope must be set so that they point to the appropriate
1062 construct, i.e. either to the current FUNCTION_DECL node, or
1063 else to the BLOCK node we just constructed.
1065 Note that for tagged types whose scope is just the formal
1066 parameter list for some function type specification, we can't
1067 properly set their TYPE_CONTEXTs here, because we don't have a
1068 pointer to the appropriate FUNCTION_TYPE node readily available
1069 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1070 type nodes get set in `grokdeclarator' as soon as we have created
1071 the FUNCTION_TYPE node which will represent the "scope" for these
1072 "parameter list local" tagged types. */
1073 if (scope->function_body)
1074 context = current_function_decl;
1075 else if (scope == file_scope)
1077 tree file_decl = build_decl (UNKNOWN_LOCATION,
1078 TRANSLATION_UNIT_DECL, 0, 0);
1079 TREE_CHAIN (file_decl) = all_translation_units;
1080 all_translation_units = file_decl;
1081 context = file_decl;
1086 /* Clear all bindings in this scope. */
1087 for (b = scope->bindings; b; b = free_binding_and_advance (b))
1090 switch (TREE_CODE (p))
1093 /* Warnings for unused labels, errors for undefined labels. */
1094 if (TREE_USED (p) && !DECL_INITIAL (p))
1096 error ("label %q+D used but not defined", p);
1097 DECL_INITIAL (p) = error_mark_node;
1100 warn_for_unused_label (p);
1102 /* Labels go in BLOCK_VARS. */
1103 TREE_CHAIN (p) = BLOCK_VARS (block);
1104 BLOCK_VARS (block) = p;
1105 gcc_assert (I_LABEL_BINDING (b->id) == b);
1106 I_LABEL_BINDING (b->id) = b->shadowed;
1108 /* Also pop back to the shadowed label_vars. */
1109 release_tree_vector (b->u.label->decls_in_scope);
1110 b->u.label = b->u.label->shadowed;
1116 set_type_context (p, context);
1118 /* Types may not have tag-names, in which case the type
1119 appears in the bindings list with b->id NULL. */
1122 gcc_assert (I_TAG_BINDING (b->id) == b);
1123 I_TAG_BINDING (b->id) = b->shadowed;
1128 /* Propagate TREE_ADDRESSABLE from nested functions to their
1129 containing functions. */
1130 if (!TREE_ASM_WRITTEN (p)
1131 && DECL_INITIAL (p) != 0
1132 && TREE_ADDRESSABLE (p)
1133 && DECL_ABSTRACT_ORIGIN (p) != 0
1134 && DECL_ABSTRACT_ORIGIN (p) != p)
1135 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
1136 if (!DECL_EXTERNAL (p)
1137 && !DECL_INITIAL (p)
1138 && scope != file_scope
1139 && scope != external_scope)
1141 error ("nested function %q+D declared but never defined", p);
1142 undef_nested_function = true;
1144 else if (DECL_DECLARED_INLINE_P (p)
1146 && !DECL_INITIAL (p))
1148 /* C99 6.7.4p6: "a function with external linkage... declared
1149 with an inline function specifier ... shall also be defined
1150 in the same translation unit." */
1151 if (!flag_gnu89_inline)
1152 pedwarn (input_location, 0,
1153 "inline function %q+D declared but never defined", p);
1154 DECL_EXTERNAL (p) = 1;
1160 /* Warnings for unused variables. */
1161 if ((!TREE_USED (p) || !DECL_READ_P (p))
1162 && !TREE_NO_WARNING (p)
1163 && !DECL_IN_SYSTEM_HEADER (p)
1165 && !DECL_ARTIFICIAL (p)
1166 && scope != file_scope
1167 && scope != external_scope)
1170 warning (OPT_Wunused_variable, "unused variable %q+D", p);
1171 else if (DECL_CONTEXT (p) == current_function_decl)
1172 warning_at (DECL_SOURCE_LOCATION (p),
1173 OPT_Wunused_but_set_variable,
1174 "variable %qD set but not used", p);
1179 error ("type of array %q+D completed incompatibly with"
1180 " implicit initialization", p);
1187 /* All of these go in BLOCK_VARS, but only if this is the
1188 binding in the home scope. */
1191 TREE_CHAIN (p) = BLOCK_VARS (block);
1192 BLOCK_VARS (block) = p;
1194 else if (VAR_OR_FUNCTION_DECL_P (p))
1196 /* For block local externs add a special
1197 DECL_EXTERNAL decl for debug info generation. */
1198 tree extp = copy_node (p);
1200 DECL_EXTERNAL (extp) = 1;
1201 TREE_STATIC (extp) = 0;
1202 TREE_PUBLIC (extp) = 1;
1203 DECL_INITIAL (extp) = NULL_TREE;
1204 DECL_LANG_SPECIFIC (extp) = NULL;
1205 DECL_CONTEXT (extp) = current_function_decl;
1206 if (TREE_CODE (p) == FUNCTION_DECL)
1208 DECL_RESULT (extp) = NULL_TREE;
1209 DECL_SAVED_TREE (extp) = NULL_TREE;
1210 DECL_STRUCT_FUNCTION (extp) = NULL;
1212 if (b->locus != UNKNOWN_LOCATION)
1213 DECL_SOURCE_LOCATION (extp) = b->locus;
1214 TREE_CHAIN (extp) = BLOCK_VARS (block);
1215 BLOCK_VARS (block) = extp;
1217 /* If this is the file scope, and we are processing more
1218 than one translation unit in this compilation, set
1219 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
1220 This makes same_translation_unit_p work, and causes
1221 static declarations to be given disambiguating suffixes. */
1222 if (scope == file_scope && num_in_fnames > 1)
1224 DECL_CONTEXT (p) = context;
1225 if (TREE_CODE (p) == TYPE_DECL)
1226 set_type_context (TREE_TYPE (p), context);
1230 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1231 already been put there by store_parm_decls. Unused-
1232 parameter warnings are handled by function.c.
1233 error_mark_node obviously does not go in BLOCK_VARS and
1234 does not get unused-variable warnings. */
1237 /* It is possible for a decl not to have a name. We get
1238 here with b->id NULL in this case. */
1241 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
1242 I_SYMBOL_BINDING (b->id) = b->shadowed;
1243 if (b->shadowed && b->shadowed->u.type)
1244 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
1254 /* Dispose of the block that we just made inside some higher level. */
1255 if ((scope->function_body || scope == file_scope) && context)
1257 DECL_INITIAL (context) = block;
1258 BLOCK_SUPERCONTEXT (block) = context;
1260 else if (scope->outer)
1263 SCOPE_LIST_APPEND (scope->outer, blocks, block);
1264 /* If we did not make a block for the scope just exited, any
1265 blocks made for inner scopes must be carried forward so they
1266 will later become subblocks of something else. */
1267 else if (scope->blocks)
1268 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
1271 /* Pop the current scope, and free the structure for reuse. */
1272 current_scope = scope->outer;
1273 if (scope->function_body)
1274 current_function_scope = scope->outer_function;
1276 memset (scope, 0, sizeof (struct c_scope));
1277 scope->outer = scope_freelist;
1278 scope_freelist = scope;
1284 push_file_scope (void)
1292 file_scope = current_scope;
1294 start_fname_decls ();
1296 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
1297 bind (DECL_NAME (decl), decl, file_scope,
1298 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl));
1302 pop_file_scope (void)
1304 /* In case there were missing closebraces, get us back to the global
1306 while (current_scope != file_scope)
1309 /* __FUNCTION__ is defined at file scope (""). This
1310 call may not be necessary as my tests indicate it
1311 still works without it. */
1312 finish_fname_decls ();
1314 check_inline_statics ();
1316 /* This is the point to write out a PCH if we're doing that.
1317 In that case we do not want to do anything else. */
1320 c_common_write_pch ();
1324 /* Pop off the file scope and close this translation unit. */
1328 maybe_apply_pending_pragma_weaks ();
1331 /* Adjust the bindings for the start of a statement expression. */
1334 c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings)
1336 struct c_scope *scope;
1338 for (scope = current_scope; scope != NULL; scope = scope->outer)
1340 struct c_binding *b;
1342 if (!scope->has_label_bindings)
1345 for (b = scope->bindings; b != NULL; b = b->prev)
1347 struct c_label_vars *label_vars;
1349 struct c_goto_bindings *g;
1351 if (TREE_CODE (b->decl) != LABEL_DECL)
1353 label_vars = b->u.label;
1354 ++label_vars->label_bindings.stmt_exprs;
1356 VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g);
1358 ++g->goto_bindings.stmt_exprs;
1362 if (switch_bindings != NULL)
1363 ++switch_bindings->stmt_exprs;
1366 /* Adjust the bindings for the end of a statement expression. */
1369 c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings)
1371 struct c_scope *scope;
1373 for (scope = current_scope; scope != NULL; scope = scope->outer)
1375 struct c_binding *b;
1377 if (!scope->has_label_bindings)
1380 for (b = scope->bindings; b != NULL; b = b->prev)
1382 struct c_label_vars *label_vars;
1384 struct c_goto_bindings *g;
1386 if (TREE_CODE (b->decl) != LABEL_DECL)
1388 label_vars = b->u.label;
1389 --label_vars->label_bindings.stmt_exprs;
1390 if (label_vars->label_bindings.stmt_exprs < 0)
1392 label_vars->label_bindings.left_stmt_expr = true;
1393 label_vars->label_bindings.stmt_exprs = 0;
1396 VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g);
1399 --g->goto_bindings.stmt_exprs;
1400 if (g->goto_bindings.stmt_exprs < 0)
1402 g->goto_bindings.left_stmt_expr = true;
1403 g->goto_bindings.stmt_exprs = 0;
1409 if (switch_bindings != NULL)
1411 --switch_bindings->stmt_exprs;
1412 gcc_assert (switch_bindings->stmt_exprs >= 0);
1416 /* Push a definition or a declaration of struct, union or enum tag "name".
1417 "type" should be the type node.
1418 We assume that the tag "name" is not already defined, and has a location
1421 Note that the definition may really be just a forward reference.
1422 In that case, the TYPE_SIZE will be zero. */
1425 pushtag (location_t loc, tree name, tree type)
1427 /* Record the identifier as the type's name if it has none. */
1428 if (name && !TYPE_NAME (type))
1429 TYPE_NAME (type) = name;
1430 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc);
1432 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1433 tagged type we just added to the current scope. This fake
1434 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1435 to output a representation of a tagged type, and it also gives
1436 us a convenient place to record the "scope start" address for the
1439 TYPE_STUB_DECL (type) = pushdecl (build_decl (loc,
1440 TYPE_DECL, NULL_TREE, type));
1442 /* An approximation for now, so we can tell this is a function-scope tag.
1443 This will be updated in pop_scope. */
1444 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1446 if (warn_cxx_compat && name != NULL_TREE)
1448 struct c_binding *b = I_SYMBOL_BINDING (name);
1451 && b->decl != NULL_TREE
1452 && TREE_CODE (b->decl) == TYPE_DECL
1453 && (B_IN_CURRENT_SCOPE (b)
1454 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
1455 && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl))
1456 != TYPE_MAIN_VARIANT (type)))
1458 warning_at (loc, OPT_Wc___compat,
1459 ("using %qD as both a typedef and a tag is "
1462 if (b->locus != UNKNOWN_LOCATION)
1463 inform (b->locus, "originally defined here");
1468 /* Subroutine of compare_decls. Allow harmless mismatches in return
1469 and argument types provided that the type modes match. This function
1470 return a unified type given a suitable match, and 0 otherwise. */
1473 match_builtin_function_types (tree newtype, tree oldtype)
1475 tree newrettype, oldrettype;
1476 tree newargs, oldargs;
1477 tree trytype, tryargs;
1479 /* Accept the return type of the new declaration if same modes. */
1480 oldrettype = TREE_TYPE (oldtype);
1481 newrettype = TREE_TYPE (newtype);
1483 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1486 oldargs = TYPE_ARG_TYPES (oldtype);
1487 newargs = TYPE_ARG_TYPES (newtype);
1490 while (oldargs || newargs)
1494 || !TREE_VALUE (oldargs)
1495 || !TREE_VALUE (newargs)
1496 || TYPE_MODE (TREE_VALUE (oldargs))
1497 != TYPE_MODE (TREE_VALUE (newargs)))
1500 oldargs = TREE_CHAIN (oldargs);
1501 newargs = TREE_CHAIN (newargs);
1504 trytype = build_function_type (newrettype, tryargs);
1505 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1508 /* Subroutine of diagnose_mismatched_decls. Check for function type
1509 mismatch involving an empty arglist vs a nonempty one and give clearer
1512 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1513 tree newtype, tree oldtype)
1517 if (TREE_CODE (olddecl) != FUNCTION_DECL
1518 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1519 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1521 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1524 t = TYPE_ARG_TYPES (oldtype);
1526 t = TYPE_ARG_TYPES (newtype);
1527 for (; t; t = TREE_CHAIN (t))
1529 tree type = TREE_VALUE (t);
1531 if (TREE_CHAIN (t) == 0
1532 && TYPE_MAIN_VARIANT (type) != void_type_node)
1534 inform (input_location, "a parameter list with an ellipsis can%'t match "
1535 "an empty parameter name list declaration");
1539 if (c_type_promotes_to (type) != type)
1541 inform (input_location, "an argument type that has a default promotion can%'t match "
1542 "an empty parameter name list declaration");
1548 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1549 old-style function definition, NEWDECL is a prototype declaration.
1550 Diagnose inconsistencies in the argument list. Returns TRUE if
1551 the prototype is compatible, FALSE if not. */
1553 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1555 tree newargs, oldargs;
1558 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1560 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1561 newargs = TYPE_ARG_TYPES (newtype);
1566 tree oldargtype = TREE_VALUE (oldargs);
1567 tree newargtype = TREE_VALUE (newargs);
1569 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1572 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1573 newargtype = TYPE_MAIN_VARIANT (newargtype);
1575 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1578 /* Reaching the end of just one list means the two decls don't
1579 agree on the number of arguments. */
1580 if (END_OF_ARGLIST (oldargtype))
1582 error ("prototype for %q+D declares more arguments "
1583 "than previous old-style definition", newdecl);
1586 else if (END_OF_ARGLIST (newargtype))
1588 error ("prototype for %q+D declares fewer arguments "
1589 "than previous old-style definition", newdecl);
1593 /* Type for passing arg must be consistent with that declared
1595 else if (!comptypes (oldargtype, newargtype))
1597 error ("prototype for %q+D declares argument %d"
1598 " with incompatible type",
1603 oldargs = TREE_CHAIN (oldargs);
1604 newargs = TREE_CHAIN (newargs);
1608 /* If we get here, no errors were found, but do issue a warning
1609 for this poor-style construct. */
1610 warning (0, "prototype for %q+D follows non-prototype definition",
1613 #undef END_OF_ARGLIST
1616 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1617 first in a pair of mismatched declarations, using the diagnostic
1620 locate_old_decl (tree decl)
1622 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1624 else if (DECL_INITIAL (decl))
1625 inform (input_location, "previous definition of %q+D was here", decl);
1626 else if (C_DECL_IMPLICIT (decl))
1627 inform (input_location, "previous implicit declaration of %q+D was here", decl);
1629 inform (input_location, "previous declaration of %q+D was here", decl);
1632 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1633 Returns true if the caller should proceed to merge the two, false
1634 if OLDDECL should simply be discarded. As a side effect, issues
1635 all necessary diagnostics for invalid or poor-style combinations.
1636 If it returns true, writes the types of NEWDECL and OLDDECL to
1637 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1638 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1641 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1642 tree *newtypep, tree *oldtypep)
1644 tree newtype, oldtype;
1645 bool pedwarned = false;
1646 bool warned = false;
1649 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1650 && DECL_EXTERNAL (DECL))
1652 /* If we have error_mark_node for either decl or type, just discard
1653 the previous decl - we're in an error cascade already. */
1654 if (olddecl == error_mark_node || newdecl == error_mark_node)
1656 *oldtypep = oldtype = TREE_TYPE (olddecl);
1657 *newtypep = newtype = TREE_TYPE (newdecl);
1658 if (oldtype == error_mark_node || newtype == error_mark_node)
1661 /* Two different categories of symbol altogether. This is an error
1662 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1663 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1665 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1666 && DECL_BUILT_IN (olddecl)
1667 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1669 error ("%q+D redeclared as different kind of symbol", newdecl);
1670 locate_old_decl (olddecl);
1672 else if (TREE_PUBLIC (newdecl))
1673 warning (0, "built-in function %q+D declared as non-function",
1676 warning (OPT_Wshadow, "declaration of %q+D shadows "
1677 "a built-in function", newdecl);
1681 /* Enumerators have no linkage, so may only be declared once in a
1683 if (TREE_CODE (olddecl) == CONST_DECL)
1685 error ("redeclaration of enumerator %q+D", newdecl);
1686 locate_old_decl (olddecl);
1690 if (!comptypes (oldtype, newtype))
1692 if (TREE_CODE (olddecl) == FUNCTION_DECL
1693 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1695 /* Accept harmless mismatch in function types.
1696 This is for the ffs and fprintf builtins. */
1697 tree trytype = match_builtin_function_types (newtype, oldtype);
1699 if (trytype && comptypes (newtype, trytype))
1700 *oldtypep = oldtype = trytype;
1703 /* If types don't match for a built-in, throw away the
1704 built-in. No point in calling locate_old_decl here, it
1705 won't print anything. */
1706 warning (0, "conflicting types for built-in function %q+D",
1711 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1712 && DECL_IS_BUILTIN (olddecl))
1714 /* A conflicting function declaration for a predeclared
1715 function that isn't actually built in. Objective C uses
1716 these. The new declaration silently overrides everything
1717 but the volatility (i.e. noreturn) indication. See also
1718 below. FIXME: Make Objective C use normal builtins. */
1719 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1722 /* Permit void foo (...) to match int foo (...) if the latter is
1723 the definition and implicit int was used. See
1724 c-torture/compile/920625-2.c. */
1725 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1726 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1727 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1728 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1730 pedwarned = pedwarn (input_location, 0,
1731 "conflicting types for %q+D", newdecl);
1732 /* Make sure we keep void as the return type. */
1733 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1734 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1736 /* Permit void foo (...) to match an earlier call to foo (...) with
1737 no declared type (thus, implicitly int). */
1738 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1739 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1740 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1741 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1743 pedwarned = pedwarn (input_location, 0,
1744 "conflicting types for %q+D", newdecl);
1745 /* Make sure we keep void as the return type. */
1746 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1750 int new_quals = TYPE_QUALS (newtype);
1751 int old_quals = TYPE_QUALS (oldtype);
1753 if (new_quals != old_quals)
1755 addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals);
1756 addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals);
1757 if (new_addr != old_addr)
1759 if (ADDR_SPACE_GENERIC_P (new_addr))
1760 error ("conflicting named address spaces (generic vs %s) "
1762 c_addr_space_name (old_addr), newdecl);
1763 else if (ADDR_SPACE_GENERIC_P (old_addr))
1764 error ("conflicting named address spaces (%s vs generic) "
1766 c_addr_space_name (new_addr), newdecl);
1768 error ("conflicting named address spaces (%s vs %s) "
1770 c_addr_space_name (new_addr),
1771 c_addr_space_name (old_addr),
1775 if (CLEAR_QUAL_ADDR_SPACE (new_quals)
1776 != CLEAR_QUAL_ADDR_SPACE (old_quals))
1777 error ("conflicting type qualifiers for %q+D", newdecl);
1780 error ("conflicting types for %q+D", newdecl);
1781 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1782 locate_old_decl (olddecl);
1787 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1788 but silently ignore the redeclaration if either is in a system
1789 header. (Conflicting redeclarations were handled above.) */
1790 if (TREE_CODE (newdecl) == TYPE_DECL)
1792 if (DECL_IN_SYSTEM_HEADER (newdecl)
1793 || DECL_IN_SYSTEM_HEADER (olddecl)
1794 || TREE_NO_WARNING (newdecl)
1795 || TREE_NO_WARNING (olddecl))
1796 return true; /* Allow OLDDECL to continue in use. */
1798 error ("redefinition of typedef %q+D", newdecl);
1799 locate_old_decl (olddecl);
1803 /* Function declarations can either be 'static' or 'extern' (no
1804 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1805 can never conflict with each other on account of linkage
1806 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1807 gnu89 mode permits two definitions if one is 'extern inline' and
1808 one is not. The non- extern-inline definition supersedes the
1809 extern-inline definition. */
1811 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1813 /* If you declare a built-in function name as static, or
1814 define the built-in with an old-style definition (so we
1815 can't validate the argument list) the built-in definition is
1816 overridden, but optionally warn this was a bad choice of name. */
1817 if (DECL_BUILT_IN (olddecl)
1818 && !C_DECL_DECLARED_BUILTIN (olddecl)
1819 && (!TREE_PUBLIC (newdecl)
1820 || (DECL_INITIAL (newdecl)
1821 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1823 warning (OPT_Wshadow, "declaration of %q+D shadows "
1824 "a built-in function", newdecl);
1825 /* Discard the old built-in function. */
1829 if (DECL_INITIAL (newdecl))
1831 if (DECL_INITIAL (olddecl))
1833 /* If both decls are in the same TU and the new declaration
1834 isn't overriding an extern inline reject the new decl.
1835 In c99, no overriding is allowed in the same translation
1837 if ((!DECL_EXTERN_INLINE (olddecl)
1838 || DECL_EXTERN_INLINE (newdecl)
1839 || (!flag_gnu89_inline
1840 && (!DECL_DECLARED_INLINE_P (olddecl)
1841 || !lookup_attribute ("gnu_inline",
1842 DECL_ATTRIBUTES (olddecl)))
1843 && (!DECL_DECLARED_INLINE_P (newdecl)
1844 || !lookup_attribute ("gnu_inline",
1845 DECL_ATTRIBUTES (newdecl))))
1847 && same_translation_unit_p (newdecl, olddecl))
1849 error ("redefinition of %q+D", newdecl);
1850 locate_old_decl (olddecl);
1855 /* If we have a prototype after an old-style function definition,
1856 the argument types must be checked specially. */
1857 else if (DECL_INITIAL (olddecl)
1858 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1859 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1860 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1862 locate_old_decl (olddecl);
1865 /* A non-static declaration (even an "extern") followed by a
1866 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1867 The same is true for a static forward declaration at block
1868 scope followed by a non-static declaration/definition at file
1869 scope. Static followed by non-static at the same scope is
1870 not undefined behavior, and is the most convenient way to get
1871 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1872 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1873 we do diagnose it if -Wtraditional. */
1874 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1876 /* Two exceptions to the rule. If olddecl is an extern
1877 inline, or a predeclared function that isn't actually
1878 built in, newdecl silently overrides olddecl. The latter
1879 occur only in Objective C; see also above. (FIXME: Make
1880 Objective C use normal builtins.) */
1881 if (!DECL_IS_BUILTIN (olddecl)
1882 && !DECL_EXTERN_INLINE (olddecl))
1884 error ("static declaration of %q+D follows "
1885 "non-static declaration", newdecl);
1886 locate_old_decl (olddecl);
1890 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1892 if (DECL_CONTEXT (olddecl))
1894 error ("non-static declaration of %q+D follows "
1895 "static declaration", newdecl);
1896 locate_old_decl (olddecl);
1899 else if (warn_traditional)
1901 warned |= warning (OPT_Wtraditional,
1902 "non-static declaration of %q+D "
1903 "follows static declaration", newdecl);
1907 /* Make sure gnu_inline attribute is either not present, or
1908 present on all inline decls. */
1909 if (DECL_DECLARED_INLINE_P (olddecl)
1910 && DECL_DECLARED_INLINE_P (newdecl))
1912 bool newa = lookup_attribute ("gnu_inline",
1913 DECL_ATTRIBUTES (newdecl)) != NULL;
1914 bool olda = lookup_attribute ("gnu_inline",
1915 DECL_ATTRIBUTES (olddecl)) != NULL;
1918 error_at (input_location, "%<gnu_inline%> attribute present on %q+D",
1919 newa ? newdecl : olddecl);
1920 error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl),
1925 else if (TREE_CODE (newdecl) == VAR_DECL)
1927 /* Only variables can be thread-local, and all declarations must
1928 agree on this property. */
1929 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1931 /* Nothing to check. Since OLDDECL is marked threadprivate
1932 and NEWDECL does not have a thread-local attribute, we
1933 will merge the threadprivate attribute into NEWDECL. */
1936 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1938 if (DECL_THREAD_LOCAL_P (newdecl))
1939 error ("thread-local declaration of %q+D follows "
1940 "non-thread-local declaration", newdecl);
1942 error ("non-thread-local declaration of %q+D follows "
1943 "thread-local declaration", newdecl);
1945 locate_old_decl (olddecl);
1949 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1950 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1952 error ("redefinition of %q+D", newdecl);
1953 locate_old_decl (olddecl);
1957 /* Objects declared at file scope: if the first declaration had
1958 external linkage (even if it was an external reference) the
1959 second must have external linkage as well, or the behavior is
1960 undefined. If the first declaration had internal linkage, then
1961 the second must too, or else be an external reference (in which
1962 case the composite declaration still has internal linkage).
1963 As for function declarations, we warn about the static-then-
1964 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1965 if (DECL_FILE_SCOPE_P (newdecl)
1966 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1968 if (DECL_EXTERNAL (newdecl))
1970 if (!DECL_FILE_SCOPE_P (olddecl))
1972 error ("extern declaration of %q+D follows "
1973 "declaration with no linkage", newdecl);
1974 locate_old_decl (olddecl);
1977 else if (warn_traditional)
1979 warned |= warning (OPT_Wtraditional,
1980 "non-static declaration of %q+D "
1981 "follows static declaration", newdecl);
1986 if (TREE_PUBLIC (newdecl))
1987 error ("non-static declaration of %q+D follows "
1988 "static declaration", newdecl);
1990 error ("static declaration of %q+D follows "
1991 "non-static declaration", newdecl);
1993 locate_old_decl (olddecl);
1997 /* Two objects with the same name declared at the same block
1998 scope must both be external references (6.7p3). */
1999 else if (!DECL_FILE_SCOPE_P (newdecl))
2001 if (DECL_EXTERNAL (newdecl))
2003 /* Extern with initializer at block scope, which will
2004 already have received an error. */
2006 else if (DECL_EXTERNAL (olddecl))
2008 error ("declaration of %q+D with no linkage follows "
2009 "extern declaration", newdecl);
2010 locate_old_decl (olddecl);
2014 error ("redeclaration of %q+D with no linkage", newdecl);
2015 locate_old_decl (olddecl);
2021 /* C++ does not permit a decl to appear multiple times at file
2024 && DECL_FILE_SCOPE_P (newdecl)
2025 && !DECL_EXTERNAL (newdecl)
2026 && !DECL_EXTERNAL (olddecl))
2027 warned |= warning_at (DECL_SOURCE_LOCATION (newdecl),
2029 ("duplicate declaration of %qD is "
2035 /* All decls must agree on a visibility. */
2036 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
2037 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
2038 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2040 warned |= warning (0, "redeclaration of %q+D with different visibility "
2041 "(old visibility preserved)", newdecl);
2044 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2046 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2047 if (DECL_DECLARED_INLINE_P (newdecl)
2048 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2050 warned |= warning (OPT_Wattributes,
2051 "inline declaration of %qD follows "
2052 "declaration with attribute noinline", newdecl);
2054 else if (DECL_DECLARED_INLINE_P (olddecl)
2055 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
2057 warned |= warning (OPT_Wattributes,
2058 "declaration of %q+D with attribute "
2059 "noinline follows inline declaration ", newdecl);
2062 else /* PARM_DECL, VAR_DECL */
2064 /* Redeclaration of a parameter is a constraint violation (this is
2065 not explicitly stated, but follows from C99 6.7p3 [no more than
2066 one declaration of the same identifier with no linkage in the
2067 same scope, except type tags] and 6.2.2p6 [parameters have no
2068 linkage]). We must check for a forward parameter declaration,
2069 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2070 an extension, the mandatory diagnostic for which is handled by
2071 mark_forward_parm_decls. */
2073 if (TREE_CODE (newdecl) == PARM_DECL
2074 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
2076 error ("redefinition of parameter %q+D", newdecl);
2077 locate_old_decl (olddecl);
2082 /* Optional warning for completely redundant decls. */
2083 if (!warned && !pedwarned
2084 && warn_redundant_decls
2085 /* Don't warn about a function declaration followed by a
2087 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2088 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
2089 /* Don't warn about redundant redeclarations of builtins. */
2090 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2091 && !DECL_BUILT_IN (newdecl)
2092 && DECL_BUILT_IN (olddecl)
2093 && !C_DECL_DECLARED_BUILTIN (olddecl))
2094 /* Don't warn about an extern followed by a definition. */
2095 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
2096 /* Don't warn about forward parameter decls. */
2097 && !(TREE_CODE (newdecl) == PARM_DECL
2098 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2099 /* Don't warn about a variable definition following a declaration. */
2100 && !(TREE_CODE (newdecl) == VAR_DECL
2101 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
2103 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
2107 /* Report location of previous decl/defn. */
2108 if (warned || pedwarned)
2109 locate_old_decl (olddecl);
2111 #undef DECL_EXTERN_INLINE
2116 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2117 consistent with OLDDECL, but carries new information. Merge the
2118 new information into OLDDECL. This function issues no
2122 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
2124 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
2125 && DECL_INITIAL (newdecl) != 0);
2126 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
2127 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
2128 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
2129 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
2130 bool extern_changed = false;
2132 /* For real parm decl following a forward decl, rechain the old decl
2133 in its new location and clear TREE_ASM_WRITTEN (it's not a
2134 forward decl anymore). */
2135 if (TREE_CODE (newdecl) == PARM_DECL
2136 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2138 struct c_binding *b, **here;
2140 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
2141 if ((*here)->decl == olddecl)
2148 b->prev = current_scope->bindings;
2149 current_scope->bindings = b;
2151 TREE_ASM_WRITTEN (olddecl) = 0;
2154 DECL_ATTRIBUTES (newdecl)
2155 = targetm.merge_decl_attributes (olddecl, newdecl);
2157 /* Merge the data types specified in the two decls. */
2159 = TREE_TYPE (olddecl)
2160 = composite_type (newtype, oldtype);
2162 /* Lay the type out, unless already done. */
2163 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
2165 if (TREE_TYPE (newdecl) != error_mark_node)
2166 layout_type (TREE_TYPE (newdecl));
2167 if (TREE_CODE (newdecl) != FUNCTION_DECL
2168 && TREE_CODE (newdecl) != TYPE_DECL
2169 && TREE_CODE (newdecl) != CONST_DECL)
2170 layout_decl (newdecl, 0);
2174 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2175 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
2176 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
2177 DECL_MODE (newdecl) = DECL_MODE (olddecl);
2178 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2180 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2181 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2185 /* Keep the old rtl since we can safely use it. */
2186 if (HAS_RTL_P (olddecl))
2187 COPY_DECL_RTL (olddecl, newdecl);
2189 /* Merge the type qualifiers. */
2190 if (TREE_READONLY (newdecl))
2191 TREE_READONLY (olddecl) = 1;
2193 if (TREE_THIS_VOLATILE (newdecl))
2194 TREE_THIS_VOLATILE (olddecl) = 1;
2196 /* Merge deprecatedness. */
2197 if (TREE_DEPRECATED (newdecl))
2198 TREE_DEPRECATED (olddecl) = 1;
2200 /* If a decl is in a system header and the other isn't, keep the one on the
2201 system header. Otherwise, keep source location of definition rather than
2202 declaration and of prototype rather than non-prototype unless that
2203 prototype is built-in. */
2204 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2205 && DECL_IN_SYSTEM_HEADER (olddecl)
2206 && !DECL_IN_SYSTEM_HEADER (newdecl) )
2207 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2208 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2209 && DECL_IN_SYSTEM_HEADER (newdecl)
2210 && !DECL_IN_SYSTEM_HEADER (olddecl))
2211 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
2212 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
2213 || (old_is_prototype && !new_is_prototype
2214 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
2215 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2217 /* Merge the initialization information. */
2218 if (DECL_INITIAL (newdecl) == 0)
2219 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2221 /* Merge the threadprivate attribute. */
2222 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
2224 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
2225 C_DECL_THREADPRIVATE_P (newdecl) = 1;
2228 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
2230 /* Merge the section attribute.
2231 We want to issue an error if the sections conflict but that
2232 must be done later in decl_attributes since we are called
2233 before attributes are assigned. */
2234 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
2235 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
2237 /* Copy the assembler name.
2238 Currently, it can only be defined in the prototype. */
2239 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2241 /* Use visibility of whichever declaration had it specified */
2242 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2244 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2245 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2248 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2250 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2251 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2252 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2253 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2254 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2255 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2256 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2257 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2258 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2259 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2260 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
2263 /* Merge the storage class information. */
2264 merge_weak (newdecl, olddecl);
2266 /* For functions, static overrides non-static. */
2267 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2269 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2270 /* This is since we don't automatically
2271 copy the attributes of NEWDECL into OLDDECL. */
2272 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2273 /* If this clears `static', clear it in the identifier too. */
2274 if (!TREE_PUBLIC (olddecl))
2275 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2279 /* In c99, 'extern' declaration before (or after) 'inline' means this
2280 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2282 if (TREE_CODE (newdecl) == FUNCTION_DECL
2283 && !flag_gnu89_inline
2284 && (DECL_DECLARED_INLINE_P (newdecl)
2285 || DECL_DECLARED_INLINE_P (olddecl))
2286 && (!DECL_DECLARED_INLINE_P (newdecl)
2287 || !DECL_DECLARED_INLINE_P (olddecl)
2288 || !DECL_EXTERNAL (olddecl))
2289 && DECL_EXTERNAL (newdecl)
2290 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
2291 && !current_function_decl)
2292 DECL_EXTERNAL (newdecl) = 0;
2294 if (DECL_EXTERNAL (newdecl))
2296 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2297 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2299 /* An extern decl does not override previous storage class. */
2300 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2301 if (!DECL_EXTERNAL (newdecl))
2303 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2304 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2309 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2310 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2313 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2315 /* If we're redefining a function previously defined as extern
2316 inline, make sure we emit debug info for the inline before we
2317 throw it away, in case it was inlined into a function that
2318 hasn't been written out yet. */
2319 if (new_is_definition && DECL_INITIAL (olddecl))
2320 /* The new defn must not be inline. */
2321 DECL_UNINLINABLE (newdecl) = 1;
2324 /* If either decl says `inline', this fn is inline, unless
2325 its definition was passed already. */
2326 if (DECL_DECLARED_INLINE_P (newdecl)
2327 || DECL_DECLARED_INLINE_P (olddecl))
2328 DECL_DECLARED_INLINE_P (newdecl) = 1;
2330 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2331 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2333 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2334 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2335 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2336 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2339 if (DECL_BUILT_IN (olddecl))
2341 /* If redeclaring a builtin function, it stays built in.
2342 But it gets tagged as having been declared. */
2343 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2344 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2345 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
2346 if (new_is_prototype)
2347 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
2349 C_DECL_BUILTIN_PROTOTYPE (newdecl)
2350 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
2353 /* Preserve function specific target and optimization options */
2354 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2355 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2356 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2357 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2359 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2360 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2361 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2362 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2364 /* Also preserve various other info from the definition. */
2365 if (!new_is_definition)
2368 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2369 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2370 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2371 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (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 (TREE_CODE (olddecl) == VAR_DECL || TREE_CODE (olddecl) == PARM_DECL)
2391 DECL_READ_P (newdecl) |= DECL_READ_P (olddecl);
2392 if (DECL_PRESERVE_P (olddecl))
2393 DECL_PRESERVE_P (newdecl) = 1;
2394 else if (DECL_PRESERVE_P (newdecl))
2395 DECL_PRESERVE_P (olddecl) = 1;
2397 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2398 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2399 DECL_ARGUMENTS (if appropriate). */
2401 unsigned olddecl_uid = DECL_UID (olddecl);
2402 tree olddecl_context = DECL_CONTEXT (olddecl);
2403 tree olddecl_arguments = NULL;
2404 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2405 olddecl_arguments = DECL_ARGUMENTS (olddecl);
2407 memcpy ((char *) olddecl + sizeof (struct tree_common),
2408 (char *) newdecl + sizeof (struct tree_common),
2409 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2410 switch (TREE_CODE (olddecl))
2420 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2421 (char *) newdecl + sizeof (struct tree_decl_common),
2422 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2427 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2428 (char *) newdecl + sizeof (struct tree_decl_common),
2429 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
2431 DECL_UID (olddecl) = olddecl_uid;
2432 DECL_CONTEXT (olddecl) = olddecl_context;
2433 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2434 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
2437 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2438 so that encode_section_info has a chance to look at the new decl
2439 flags and attributes. */
2440 if (DECL_RTL_SET_P (olddecl)
2441 && (TREE_CODE (olddecl) == FUNCTION_DECL
2442 || (TREE_CODE (olddecl) == VAR_DECL
2443 && TREE_STATIC (olddecl))))
2444 make_decl_rtl (olddecl);
2446 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
2447 and the definition is coming from the old version, cgraph needs
2448 to be called again. */
2449 if (extern_changed && !new_is_definition
2450 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
2451 cgraph_mark_if_needed (olddecl);
2454 /* Handle when a new declaration NEWDECL has the same name as an old
2455 one OLDDECL in the same binding contour. Prints an error message
2458 If safely possible, alter OLDDECL to look like NEWDECL, and return
2459 true. Otherwise, return false. */
2462 duplicate_decls (tree newdecl, tree olddecl)
2464 tree newtype = NULL, oldtype = NULL;
2466 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
2468 /* Avoid `unused variable' and other warnings for OLDDECL. */
2469 TREE_NO_WARNING (olddecl) = 1;
2473 merge_decls (newdecl, olddecl, newtype, oldtype);
2478 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2480 warn_if_shadowing (tree new_decl)
2482 struct c_binding *b;
2484 /* Shadow warnings wanted? */
2486 /* No shadow warnings for internally generated vars. */
2487 || DECL_IS_BUILTIN (new_decl)
2488 /* No shadow warnings for vars made for inlining. */
2489 || DECL_FROM_INLINE (new_decl))
2492 /* Is anything being shadowed? Invisible decls do not count. */
2493 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
2494 if (b->decl && b->decl != new_decl && !b->invisible)
2496 tree old_decl = b->decl;
2498 if (old_decl == error_mark_node)
2500 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
2501 "non-variable", new_decl);
2504 else if (TREE_CODE (old_decl) == PARM_DECL)
2505 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
2507 else if (DECL_FILE_SCOPE_P (old_decl))
2508 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
2509 "declaration", new_decl);
2510 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2511 && DECL_BUILT_IN (old_decl))
2513 warning (OPT_Wshadow, "declaration of %q+D shadows "
2514 "a built-in function", new_decl);
2518 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
2521 warning_at (DECL_SOURCE_LOCATION (old_decl), OPT_Wshadow,
2522 "shadowed declaration is here");
2528 /* Record a decl-node X as belonging to the current lexical scope.
2529 Check for errors (such as an incompatible declaration for the same
2530 name already seen in the same scope).
2532 Returns either X or an old decl for the same name.
2533 If an old decl is returned, it may have been smashed
2534 to agree with what X says. */
2539 tree name = DECL_NAME (x);
2540 struct c_scope *scope = current_scope;
2541 struct c_binding *b;
2542 bool nested = false;
2543 location_t locus = DECL_SOURCE_LOCATION (x);
2545 /* Must set DECL_CONTEXT for everything not at file scope or
2546 DECL_FILE_SCOPE_P won't work. Local externs don't count
2547 unless they have initializers (which generate code). */
2548 if (current_function_decl
2549 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2550 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2551 DECL_CONTEXT (x) = current_function_decl;
2553 /* Anonymous decls are just inserted in the scope. */
2556 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
2561 /* First, see if there is another declaration with the same name in
2562 the current scope. If there is, duplicate_decls may do all the
2563 work for us. If duplicate_decls returns false, that indicates
2564 two incompatible decls in the same scope; we are to silently
2565 replace the old one (duplicate_decls has issued all appropriate
2566 diagnostics). In particular, we should not consider possible
2567 duplicates in the external scope, or shadowing. */
2568 b = I_SYMBOL_BINDING (name);
2569 if (b && B_IN_SCOPE (b, scope))
2571 struct c_binding *b_ext, *b_use;
2572 tree type = TREE_TYPE (x);
2573 tree visdecl = b->decl;
2574 tree vistype = TREE_TYPE (visdecl);
2575 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2576 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2577 b->inner_comp = false;
2580 /* If this is an external linkage declaration, we should check
2581 for compatibility with the type in the external scope before
2582 setting the type at this scope based on the visible
2583 information only. */
2584 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2586 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2587 b_ext = b_ext->shadowed;
2592 TREE_TYPE (b_use->decl) = b_use->u.type;
2595 if (duplicate_decls (x, b_use->decl))
2599 /* Save the updated type in the external scope and
2600 restore the proper type for this scope. */
2602 if (comptypes (vistype, type))
2603 thistype = composite_type (vistype, type);
2605 thistype = TREE_TYPE (b_use->decl);
2606 b_use->u.type = TREE_TYPE (b_use->decl);
2607 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2608 && DECL_BUILT_IN (b_use->decl))
2610 = build_type_attribute_variant (thistype,
2613 TREE_TYPE (b_use->decl) = thistype;
2618 goto skip_external_and_shadow_checks;
2621 /* All declarations with external linkage, and all external
2622 references, go in the external scope, no matter what scope is
2623 current. However, the binding in that scope is ignored for
2624 purposes of normal name lookup. A separate binding structure is
2625 created in the requested scope; this governs the normal
2626 visibility of the symbol.
2628 The binding in the externals scope is used exclusively for
2629 detecting duplicate declarations of the same object, no matter
2630 what scope they are in; this is what we do here. (C99 6.2.7p2:
2631 All declarations that refer to the same object or function shall
2632 have compatible type; otherwise, the behavior is undefined.) */
2633 if (DECL_EXTERNAL (x) || scope == file_scope)
2635 tree type = TREE_TYPE (x);
2638 bool type_saved = false;
2639 if (b && !B_IN_EXTERNAL_SCOPE (b)
2640 && (TREE_CODE (b->decl) == FUNCTION_DECL
2641 || TREE_CODE (b->decl) == VAR_DECL)
2642 && DECL_FILE_SCOPE_P (b->decl))
2645 vistype = TREE_TYPE (visdecl);
2647 if (scope != file_scope
2648 && !DECL_IN_SYSTEM_HEADER (x))
2649 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2651 while (b && !B_IN_EXTERNAL_SCOPE (b))
2653 /* If this decl might be modified, save its type. This is
2654 done here rather than when the decl is first bound
2655 because the type may change after first binding, through
2656 being completed or through attributes being added. If we
2657 encounter multiple such decls, only the first should have
2658 its type saved; the others will already have had their
2659 proper types saved and the types will not have changed as
2660 their scopes will not have been re-entered. */
2661 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2663 b->u.type = TREE_TYPE (b->decl);
2666 if (B_IN_FILE_SCOPE (b)
2667 && TREE_CODE (b->decl) == VAR_DECL
2668 && TREE_STATIC (b->decl)
2669 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2670 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2671 && TREE_CODE (type) == ARRAY_TYPE
2672 && TYPE_DOMAIN (type)
2673 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2674 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2676 /* Array type completed in inner scope, which should be
2677 diagnosed if the completion does not have size 1 and
2678 it does not get completed in the file scope. */
2679 b->inner_comp = true;
2684 /* If a matching external declaration has been found, set its
2685 type to the composite of all the types of that declaration.
2686 After the consistency checks, it will be reset to the
2687 composite of the visible types only. */
2688 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2690 TREE_TYPE (b->decl) = b->u.type;
2692 /* The point of the same_translation_unit_p check here is,
2693 we want to detect a duplicate decl for a construct like
2694 foo() { extern bar(); } ... static bar(); but not if
2695 they are in different translation units. In any case,
2696 the static does not go in the externals scope. */
2698 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2699 && duplicate_decls (x, b->decl))
2704 if (comptypes (vistype, type))
2705 thistype = composite_type (vistype, type);
2707 thistype = TREE_TYPE (b->decl);
2711 b->u.type = TREE_TYPE (b->decl);
2712 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2714 = build_type_attribute_variant (thistype,
2715 TYPE_ATTRIBUTES (b->u.type));
2716 TREE_TYPE (b->decl) = thistype;
2717 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
2721 else if (TREE_PUBLIC (x))
2723 if (visdecl && !b && duplicate_decls (x, visdecl))
2725 /* An external declaration at block scope referring to a
2726 visible entity with internal linkage. The composite
2727 type will already be correct for this scope, so we
2728 just need to fall through to make the declaration in
2735 bind (name, x, external_scope, /*invisible=*/true,
2736 /*nested=*/false, locus);
2742 if (TREE_CODE (x) != PARM_DECL)
2743 warn_if_shadowing (x);
2745 skip_external_and_shadow_checks:
2746 if (TREE_CODE (x) == TYPE_DECL)
2747 set_underlying_type (x);
2749 bind (name, x, scope, /*invisible=*/false, nested, locus);
2751 /* If x's type is incomplete because it's based on a
2752 structure or union which has not yet been fully declared,
2753 attach it to that structure or union type, so we can go
2754 back and complete the variable declaration later, if the
2755 structure or union gets fully declared.
2757 If the input is erroneous, we can have error_mark in the type
2758 slot (e.g. "f(void a, ...)") - that doesn't count as an
2760 if (TREE_TYPE (x) != error_mark_node
2761 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2763 tree element = TREE_TYPE (x);
2765 while (TREE_CODE (element) == ARRAY_TYPE)
2766 element = TREE_TYPE (element);
2767 element = TYPE_MAIN_VARIANT (element);
2769 if ((TREE_CODE (element) == RECORD_TYPE
2770 || TREE_CODE (element) == UNION_TYPE)
2771 && (TREE_CODE (x) != TYPE_DECL
2772 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2773 && !COMPLETE_TYPE_P (element))
2774 C_TYPE_INCOMPLETE_VARS (element)
2775 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2780 /* Record X as belonging to file scope.
2781 This is used only internally by the Objective-C front end,
2782 and is limited to its needs. duplicate_decls is not called;
2783 if there is any preexisting decl for this identifier, it is an ICE. */
2786 pushdecl_top_level (tree x)
2789 bool nested = false;
2790 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2792 name = DECL_NAME (x);
2794 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2796 if (TREE_PUBLIC (x))
2798 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false,
2803 bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION);
2809 implicit_decl_warning (tree id, tree olddecl)
2811 if (warn_implicit_function_declaration)
2816 warned = pedwarn (input_location, OPT_Wimplicit_function_declaration,
2817 "implicit declaration of function %qE", id);
2819 warned = warning (OPT_Wimplicit_function_declaration,
2820 G_("implicit declaration of function %qE"), id);
2821 if (olddecl && warned)
2822 locate_old_decl (olddecl);
2826 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2827 function of type int (). */
2830 implicitly_declare (location_t loc, tree functionid)
2832 struct c_binding *b;
2836 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2838 if (B_IN_SCOPE (b, external_scope))
2847 if (decl == error_mark_node)
2850 /* FIXME: Objective-C has weird not-really-builtin functions
2851 which are supposed to be visible automatically. They wind up
2852 in the external scope because they're pushed before the file
2853 scope gets created. Catch this here and rebind them into the
2855 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2857 bind (functionid, decl, file_scope,
2858 /*invisible=*/false, /*nested=*/true,
2859 DECL_SOURCE_LOCATION (decl));
2864 tree newtype = default_function_type;
2866 TREE_TYPE (decl) = b->u.type;
2867 /* Implicit declaration of a function already declared
2868 (somehow) in a different scope, or as a built-in.
2869 If this is the first time this has happened, warn;
2870 then recycle the old declaration but with the new type. */
2871 if (!C_DECL_IMPLICIT (decl))
2873 implicit_decl_warning (functionid, decl);
2874 C_DECL_IMPLICIT (decl) = 1;
2876 if (DECL_BUILT_IN (decl))
2878 newtype = build_type_attribute_variant (newtype,
2880 (TREE_TYPE (decl)));
2881 if (!comptypes (newtype, TREE_TYPE (decl)))
2883 warning_at (loc, 0, "incompatible implicit declaration of "
2884 "built-in function %qD", decl);
2885 newtype = TREE_TYPE (decl);
2890 if (!comptypes (newtype, TREE_TYPE (decl)))
2892 error_at (loc, "incompatible implicit declaration of function %qD", decl);
2893 locate_old_decl (decl);
2896 b->u.type = TREE_TYPE (decl);
2897 TREE_TYPE (decl) = newtype;
2898 bind (functionid, decl, current_scope,
2899 /*invisible=*/false, /*nested=*/true,
2900 DECL_SOURCE_LOCATION (decl));
2905 /* Not seen before. */
2906 decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type);
2907 DECL_EXTERNAL (decl) = 1;
2908 TREE_PUBLIC (decl) = 1;
2909 C_DECL_IMPLICIT (decl) = 1;
2910 implicit_decl_warning (functionid, 0);
2911 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2913 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2915 /* C89 says implicit declarations are in the innermost block.
2916 So we record the decl in the standard fashion. */
2917 decl = pushdecl (decl);
2919 /* No need to call objc_check_decl here - it's a function type. */
2920 rest_of_decl_compilation (decl, 0, 0);
2922 /* Write a record describing this implicit function declaration
2923 to the prototypes file (if requested). */
2924 gen_aux_info_record (decl, 0, 1, 0);
2926 /* Possibly apply some default attributes to this implicit declaration. */
2927 decl_attributes (&decl, NULL_TREE, 0);
2932 /* Issue an error message for a reference to an undeclared variable
2933 ID, including a reference to a builtin outside of function-call
2934 context. Establish a binding of the identifier to error_mark_node
2935 in an appropriate scope, which will suppress further errors for the
2936 same identifier. The error message should be given location LOC. */
2938 undeclared_variable (location_t loc, tree id)
2940 static bool already = false;
2941 struct c_scope *scope;
2943 if (current_function_decl == 0)
2945 error_at (loc, "%qE undeclared here (not in a function)", id);
2946 scope = current_scope;
2950 error_at (loc, "%qE undeclared (first use in this function)", id);
2953 inform (loc, "each undeclared identifier is reported only"
2954 " once for each function it appears in");
2958 /* If we are parsing old-style parameter decls, current_function_decl
2959 will be nonnull but current_function_scope will be null. */
2960 scope = current_function_scope ? current_function_scope : current_scope;
2962 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
2966 /* Subroutine of lookup_label, declare_label, define_label: construct a
2967 LABEL_DECL with all the proper frills. Also create a struct
2968 c_label_vars initialized for the current scope. */
2971 make_label (location_t location, tree name, bool defining,
2972 struct c_label_vars **p_label_vars)
2974 tree label = build_decl (location, LABEL_DECL, name, void_type_node);
2975 struct c_label_vars *label_vars;
2977 DECL_CONTEXT (label) = current_function_decl;
2978 DECL_MODE (label) = VOIDmode;
2980 label_vars = GGC_NEW (struct c_label_vars);
2981 label_vars->shadowed = NULL;
2982 set_spot_bindings (&label_vars->label_bindings, defining);
2983 label_vars->decls_in_scope = make_tree_vector ();
2984 label_vars->gotos = VEC_alloc (c_goto_bindings_p, gc, 0);
2985 *p_label_vars = label_vars;
2990 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2991 Create one if none exists so far for the current function.
2992 This is called when a label is used in a goto expression or
2993 has its address taken. */
2996 lookup_label (tree name)
2999 struct c_label_vars *label_vars;
3001 if (current_function_decl == 0)
3003 error ("label %qE referenced outside of any function", name);
3007 /* Use a label already defined or ref'd with this name, but not if
3008 it is inherited from a containing function and wasn't declared
3010 label = I_LABEL_DECL (name);
3011 if (label && (DECL_CONTEXT (label) == current_function_decl
3012 || C_DECLARED_LABEL_FLAG (label)))
3014 /* If the label has only been declared, update its apparent
3015 location to point here, for better diagnostics if it
3016 turns out not to have been defined. */
3017 if (DECL_INITIAL (label) == NULL_TREE)
3018 DECL_SOURCE_LOCATION (label) = input_location;
3022 /* No label binding for that identifier; make one. */
3023 label = make_label (input_location, name, false, &label_vars);
3025 /* Ordinary labels go in the current function scope. */
3026 bind_label (name, label, current_function_scope, label_vars);
3031 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3035 warn_about_goto (location_t goto_loc, tree label, tree decl)
3037 if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3039 "jump into scope of identifier with variably modified type");
3041 warning_at (goto_loc, OPT_Wjump_misses_init,
3042 "jump skips variable initialization");
3043 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3044 inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl);
3047 /* Look up a label because of a goto statement. This is like
3048 lookup_label, but also issues any appropriate warnings. */
3051 lookup_label_for_goto (location_t loc, tree name)
3054 struct c_label_vars *label_vars;
3058 label = lookup_label (name);
3059 if (label == NULL_TREE)
3062 /* If we are jumping to a different function, we can't issue any
3064 if (DECL_CONTEXT (label) != current_function_decl)
3066 gcc_assert (C_DECLARED_LABEL_FLAG (label));
3070 label_vars = I_LABEL_BINDING (name)->u.label;
3072 /* If the label has not yet been defined, then push this goto on a
3073 list for possible later warnings. */
3074 if (label_vars->label_bindings.scope == NULL)
3076 struct c_goto_bindings *g;
3078 g = GGC_NEW (struct c_goto_bindings);
3080 set_spot_bindings (&g->goto_bindings, true);
3081 VEC_safe_push (c_goto_bindings_p, gc, label_vars->gotos, g);
3085 /* If there are any decls in label_vars->decls_in_scope, then this
3086 goto has missed the declaration of the decl. This happens for a
3092 Issue a warning or error. */
3093 for (ix = 0; VEC_iterate (tree, label_vars->decls_in_scope, ix, decl); ++ix)
3094 warn_about_goto (loc, label, decl);
3096 if (label_vars->label_bindings.left_stmt_expr)
3098 error_at (loc, "jump into statement expression");
3099 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3105 /* Make a label named NAME in the current function, shadowing silently
3106 any that may be inherited from containing functions or containing
3107 scopes. This is called for __label__ declarations. */
3110 declare_label (tree name)
3112 struct c_binding *b = I_LABEL_BINDING (name);
3114 struct c_label_vars *label_vars;
3116 /* Check to make sure that the label hasn't already been declared
3118 if (b && B_IN_CURRENT_SCOPE (b))
3120 error ("duplicate label declaration %qE", name);
3121 locate_old_decl (b->decl);
3123 /* Just use the previous declaration. */
3127 label = make_label (input_location, name, false, &label_vars);
3128 C_DECLARED_LABEL_FLAG (label) = 1;
3130 /* Declared labels go in the current scope. */
3131 bind_label (name, label, current_scope, label_vars);
3136 /* When we define a label, issue any appropriate warnings if there are
3137 any gotos earlier in the function which jump to this label. */
3140 check_earlier_gotos (tree label, struct c_label_vars* label_vars)
3143 struct c_goto_bindings *g;
3146 VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g);
3149 struct c_binding *b;
3150 struct c_scope *scope;
3152 /* We have a goto to this label. The goto is going forward. In
3153 g->scope, the goto is going to skip any binding which was
3154 defined after g->bindings_in_scope. */
3155 for (b = g->goto_bindings.scope->bindings;
3156 b != g->goto_bindings.bindings_in_scope;
3159 if (decl_jump_unsafe (b->decl))
3160 warn_about_goto (g->loc, label, b->decl);
3163 /* We also need to warn about decls defined in any scopes
3164 between the scope of the label and the scope of the goto. */
3165 for (scope = label_vars->label_bindings.scope;
3166 scope != g->goto_bindings.scope;
3167 scope = scope->outer)
3169 gcc_assert (scope != NULL);
3170 if (scope == label_vars->label_bindings.scope)
3171 b = label_vars->label_bindings.bindings_in_scope;
3173 b = scope->bindings;
3174 for (; b != NULL; b = b->prev)
3176 if (decl_jump_unsafe (b->decl))
3177 warn_about_goto (g->loc, label, b->decl);
3181 if (g->goto_bindings.stmt_exprs > 0)
3183 error_at (g->loc, "jump into statement expression");
3184 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here",
3189 /* Now that the label is defined, we will issue warnings about
3190 subsequent gotos to this label when we see them. */
3191 VEC_truncate (c_goto_bindings_p, label_vars->gotos, 0);
3192 label_vars->gotos = NULL;
3195 /* Define a label, specifying the location in the source file.
3196 Return the LABEL_DECL node for the label, if the definition is valid.
3197 Otherwise return 0. */
3200 define_label (location_t location, tree name)
3202 /* Find any preexisting label with this name. It is an error
3203 if that label has already been defined in this function, or
3204 if there is a containing function with a declared label with
3206 tree label = I_LABEL_DECL (name);
3209 && ((DECL_CONTEXT (label) == current_function_decl
3210 && DECL_INITIAL (label) != 0)
3211 || (DECL_CONTEXT (label) != current_function_decl
3212 && C_DECLARED_LABEL_FLAG (label))))
3214 error_at (location, "duplicate label %qD", label);
3215 locate_old_decl (label);
3218 else if (label && DECL_CONTEXT (label) == current_function_decl)
3220 struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label;
3222 /* The label has been used or declared already in this function,
3223 but not defined. Update its location to point to this
3225 DECL_SOURCE_LOCATION (label) = location;
3226 set_spot_bindings (&label_vars->label_bindings, true);
3228 /* Issue warnings as required about any goto statements from
3229 earlier in the function. */
3230 check_earlier_gotos (label, label_vars);
3234 struct c_label_vars *label_vars;
3236 /* No label binding for that identifier; make one. */
3237 label = make_label (location, name, true, &label_vars);
3239 /* Ordinary labels go in the current function scope. */
3240 bind_label (name, label, current_function_scope, label_vars);
3243 if (!in_system_header && lookup_name (name))
3244 warning_at (location, OPT_Wtraditional,
3245 "traditional C lacks a separate namespace "
3246 "for labels, identifier %qE conflicts", name);
3248 /* Mark label as having been defined. */
3249 DECL_INITIAL (label) = error_mark_node;
3253 /* Get the bindings for a new switch statement. This is used to issue
3254 warnings as appropriate for jumps from the switch to case or
3257 struct c_spot_bindings *
3258 c_get_switch_bindings (void)
3260 struct c_spot_bindings *switch_bindings;
3262 switch_bindings = XNEW (struct c_spot_bindings);
3263 set_spot_bindings (switch_bindings, true);
3264 return switch_bindings;
3268 c_release_switch_bindings (struct c_spot_bindings *bindings)
3270 gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr);
3274 /* This is called at the point of a case or default label to issue
3275 warnings about decls as needed. It returns true if it found an
3276 error, not just a warning. */
3279 c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings,
3280 location_t switch_loc, location_t case_loc)
3283 struct c_scope *scope;
3286 for (scope = current_scope;
3287 scope != switch_bindings->scope;
3288 scope = scope->outer)
3290 struct c_binding *b;
3292 gcc_assert (scope != NULL);
3293 for (b = scope->bindings; b != NULL; b = b->prev)
3295 if (decl_jump_unsafe (b->decl))
3297 if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE))
3301 ("switch jumps into scope of identifier with "
3302 "variably modified type"));
3305 warning_at (case_loc, OPT_Wjump_misses_init,
3306 "switch jumps over variable initialization");
3307 inform (switch_loc, "switch starts here");
3308 inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here",
3314 if (switch_bindings->stmt_exprs > 0)
3317 error_at (case_loc, "switch jumps into statement expression");
3318 inform (switch_loc, "switch starts here");
3324 /* Given NAME, an IDENTIFIER_NODE,
3325 return the structure (or union or enum) definition for that name.
3326 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3327 CODE says which kind of type the caller wants;
3328 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3329 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3330 location where the tag was defined.
3331 If the wrong kind of type is found, an error is reported. */
3334 lookup_tag (enum tree_code code, tree name, int thislevel_only,
3337 struct c_binding *b = I_TAG_BINDING (name);
3343 /* We only care about whether it's in this level if
3344 thislevel_only was set or it might be a type clash. */
3345 if (thislevel_only || TREE_CODE (b->decl) != code)
3347 /* For our purposes, a tag in the external scope is the same as
3348 a tag in the file scope. (Primarily relevant to Objective-C
3349 and its builtin structure tags, which get pushed before the
3350 file scope is created.) */
3351 if (B_IN_CURRENT_SCOPE (b)
3352 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
3356 if (thislevel_only && !thislevel)
3359 if (TREE_CODE (b->decl) != code)
3361 /* Definition isn't the kind we were looking for. */
3362 pending_invalid_xref = name;
3363 pending_invalid_xref_location = input_location;
3365 /* If in the same binding level as a declaration as a tag
3366 of a different type, this must not be allowed to
3367 shadow that tag, so give the error immediately.
3368 (For example, "struct foo; union foo;" is invalid.) */
3370 pending_xref_error ();
3379 /* Print an error message now
3380 for a recent invalid struct, union or enum cross reference.
3381 We don't print them immediately because they are not invalid
3382 when used in the `struct foo;' construct for shadowing. */
3385 pending_xref_error (void)
3387 if (pending_invalid_xref != 0)
3388 error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag",
3389 pending_invalid_xref);
3390 pending_invalid_xref = 0;
3394 /* Look up NAME in the current scope and its superiors
3395 in the namespace of variables, functions and typedefs.
3396 Return a ..._DECL node of some kind representing its definition,
3397 or return 0 if it is undefined. */
3400 lookup_name (tree name)
3402 struct c_binding *b = I_SYMBOL_BINDING (name);
3403 if (b && !b->invisible)
3408 /* Similar to `lookup_name' but look only at the indicated scope. */
3411 lookup_name_in_scope (tree name, struct c_scope *scope)
3413 struct c_binding *b;
3415 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
3416 if (B_IN_SCOPE (b, scope))
3421 /* Create the predefined scalar types of C,
3422 and some nodes representing standard constants (0, 1, (void *) 0).
3423 Initialize the global scope.
3424 Make definitions for built-in primitive functions. */
3427 c_init_decl_processing (void)
3429 location_t save_loc = input_location;
3431 /* Initialize reserved words for parser. */
3434 current_function_decl = 0;
3436 gcc_obstack_init (&parser_obstack);
3438 /* Make the externals scope. */
3440 external_scope = current_scope;
3442 /* Declarations from c_common_nodes_and_builtins must not be associated
3443 with this input file, lest we get differences between using and not
3444 using preprocessed headers. */
3445 input_location = BUILTINS_LOCATION;
3447 build_common_tree_nodes (flag_signed_char);
3449 c_common_nodes_and_builtins ();
3451 /* In C, comparisons and TRUTH_* expressions have type int. */
3452 truthvalue_type_node = integer_type_node;
3453 truthvalue_true_node = integer_one_node;
3454 truthvalue_false_node = integer_zero_node;
3456 /* Even in C99, which has a real boolean type. */
3457 pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"),
3458 boolean_type_node));
3460 input_location = save_loc;
3462 pedantic_lvalues = true;
3464 make_fname_decl = c_make_fname_decl;
3465 start_fname_decls ();
3468 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3469 give the decl, NAME is the initialization string and TYPE_DEP
3470 indicates whether NAME depended on the type of the function. As we
3471 don't yet implement delayed emission of static data, we mark the
3472 decl as emitted so it is not placed in the output. Anything using
3473 it must therefore pull out the STRING_CST initializer directly.
3477 c_make_fname_decl (location_t loc, tree id, int type_dep)
3479 const char *name = fname_as_string (type_dep);
3480 tree decl, type, init;
3481 size_t length = strlen (name);
3483 type = build_array_type (char_type_node,
3484 build_index_type (size_int (length)));
3485 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
3487 decl = build_decl (loc, VAR_DECL, id, type);
3489 TREE_STATIC (decl) = 1;
3490 TREE_READONLY (decl) = 1;
3491 DECL_ARTIFICIAL (decl) = 1;
3493 init = build_string (length + 1, name);
3494 free (CONST_CAST (char *, name));
3495 TREE_TYPE (init) = type;
3496 DECL_INITIAL (decl) = init;
3498 TREE_USED (decl) = 1;
3500 if (current_function_decl
3501 /* For invalid programs like this:
3504 const char* p = __FUNCTION__;
3506 the __FUNCTION__ is believed to appear in K&R style function
3507 parameter declarator. In that case we still don't have
3509 && (!errorcount || current_function_scope))
3511 DECL_CONTEXT (decl) = current_function_decl;
3512 bind (id, decl, current_function_scope,
3513 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
3516 finish_decl (decl, loc, init, NULL_TREE, NULL_TREE);
3522 c_builtin_function (tree decl)
3524 tree type = TREE_TYPE (decl);
3525 tree id = DECL_NAME (decl);
3527 const char *name = IDENTIFIER_POINTER (id);
3528 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
3530 /* Should never be called on a symbol with a preexisting meaning. */
3531 gcc_assert (!I_SYMBOL_BINDING (id));
3533 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false,
3536 /* Builtins in the implementation namespace are made visible without
3537 needing to be explicitly declared. See push_file_scope. */
3538 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3540 TREE_CHAIN (decl) = visible_builtins;
3541 visible_builtins = decl;
3548 c_builtin_function_ext_scope (tree decl)
3550 tree type = TREE_TYPE (decl);
3551 tree id = DECL_NAME (decl);
3553 const char *name = IDENTIFIER_POINTER (id);
3554 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
3556 /* Should never be called on a symbol with a preexisting meaning. */
3557 gcc_assert (!I_SYMBOL_BINDING (id));
3559 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false,
3562 /* Builtins in the implementation namespace are made visible without
3563 needing to be explicitly declared. See push_file_scope. */
3564 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3566 TREE_CHAIN (decl) = visible_builtins;
3567 visible_builtins = decl;
3573 /* Called when a declaration is seen that contains no names to declare.
3574 If its type is a reference to a structure, union or enum inherited
3575 from a containing scope, shadow that tag name for the current scope
3576 with a forward reference.
3577 If its type defines a new named structure or union
3578 or defines an enum, it is valid but we need not do anything here.
3579 Otherwise, it is an error. */
3582 shadow_tag (const struct c_declspecs *declspecs)
3584 shadow_tag_warned (declspecs, 0);
3587 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3590 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
3592 bool found_tag = false;
3594 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
3596 tree value = declspecs->type;
3597 enum tree_code code = TREE_CODE (value);
3599 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3600 /* Used to test also that TYPE_SIZE (value) != 0.
3601 That caused warning for `struct foo;' at top level in the file. */
3603 tree name = TYPE_NAME (value);
3608 if (declspecs->restrict_p)
3610 error ("invalid use of %<restrict%>");
3616 if (warned != 1 && code != ENUMERAL_TYPE)
3617 /* Empty unnamed enum OK */
3619 pedwarn (input_location, 0,
3620 "unnamed struct/union that defines no instances");
3624 else if (!declspecs->tag_defined_p
3625 && declspecs->storage_class != csc_none)
3628 pedwarn (input_location, 0,
3629 "empty declaration with storage class specifier "
3630 "does not redeclare tag");
3632 pending_xref_error ();
3634 else if (!declspecs->tag_defined_p
3635 && (declspecs->const_p
3636 || declspecs->volatile_p
3637 || declspecs->restrict_p
3638 || declspecs->address_space))
3641 pedwarn (input_location, 0,
3642 "empty declaration with type qualifier "
3643 "does not redeclare tag");
3645 pending_xref_error ();
3649 pending_invalid_xref = 0;
3650 t = lookup_tag (code, name, 1, NULL);
3654 t = make_node (code);
3655 pushtag (input_location, name, t);
3661 if (warned != 1 && !in_system_header)
3663 pedwarn (input_location, 0,
3664 "useless type name in empty declaration");
3669 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
3671 pedwarn (input_location, 0, "useless type name in empty declaration");
3675 pending_invalid_xref = 0;
3677 if (declspecs->inline_p)
3679 error ("%<inline%> in empty declaration");
3683 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
3685 error ("%<auto%> in file-scope empty declaration");
3689 if (current_scope == file_scope && declspecs->storage_class == csc_register)
3691 error ("%<register%> in file-scope empty declaration");
3695 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
3697 warning (0, "useless storage class specifier in empty declaration");
3701 if (!warned && !in_system_header && declspecs->thread_p)
3703 warning (0, "useless %<__thread%> in empty declaration");
3707 if (!warned && !in_system_header && (declspecs->const_p
3708 || declspecs->volatile_p
3709 || declspecs->restrict_p
3710 || declspecs->address_space))
3712 warning (0, "useless type qualifier in empty declaration");
3719 pedwarn (input_location, 0, "empty declaration");
3724 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3725 bits. SPECS represents declaration specifiers that the grammar
3726 only permits to contain type qualifiers and attributes. */
3729 quals_from_declspecs (const struct c_declspecs *specs)
3731 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3732 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3733 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0)
3734 | (ENCODE_QUAL_ADDR_SPACE (specs->address_space)));
3735 gcc_assert (!specs->type
3736 && !specs->decl_attr
3737 && specs->typespec_word == cts_none
3738 && specs->storage_class == csc_none
3739 && !specs->typedef_p
3740 && !specs->explicit_signed_p
3741 && !specs->deprecated_p
3743 && !specs->long_long_p
3746 && !specs->unsigned_p
3747 && !specs->complex_p
3749 && !specs->thread_p);
3753 /* Construct an array declarator. LOC is the location of the
3754 beginning of the array (usually the opening brace). EXPR is the
3755 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3756 inside the [] (to be applied to the pointer to which a parameter
3757 array is converted). STATIC_P is true if "static" is inside the
3758 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3759 VLA of unspecified length which is nevertheless a complete type,
3760 false otherwise. The field for the contained declarator is left to
3761 be filled in by set_array_declarator_inner. */
3763 struct c_declarator *
3764 build_array_declarator (location_t loc,
3765 tree expr, struct c_declspecs *quals, bool static_p,
3768 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3769 struct c_declarator);
3770 declarator->id_loc = loc;
3771 declarator->kind = cdk_array;
3772 declarator->declarator = 0;
3773 declarator->u.array.dimen = expr;
3776 declarator->u.array.attrs = quals->attrs;
3777 declarator->u.array.quals = quals_from_declspecs (quals);
3781 declarator->u.array.attrs = NULL_TREE;
3782 declarator->u.array.quals = 0;
3784 declarator->u.array.static_p = static_p;
3785 declarator->u.array.vla_unspec_p = vla_unspec_p;
3788 if (static_p || quals != NULL)
3789 pedwarn (loc, OPT_pedantic,
3790 "ISO C90 does not support %<static%> or type "
3791 "qualifiers in parameter array declarators");
3793 pedwarn (loc, OPT_pedantic,
3794 "ISO C90 does not support %<[*]%> array declarators");
3798 if (!current_scope->parm_flag)
3801 error_at (loc, "%<[*]%> not allowed in other than "
3802 "function prototype scope");
3803 declarator->u.array.vla_unspec_p = false;
3806 current_scope->had_vla_unspec = true;
3811 /* Set the contained declarator of an array declarator. DECL is the
3812 declarator, as constructed by build_array_declarator; INNER is what
3813 appears on the left of the []. */
3815 struct c_declarator *
3816 set_array_declarator_inner (struct c_declarator *decl,
3817 struct c_declarator *inner)
3819 decl->declarator = inner;
3823 /* INIT is a constructor that forms DECL's initializer. If the final
3824 element initializes a flexible array field, add the size of that
3825 initializer to DECL's size. */
3828 add_flexible_array_elts_to_size (tree decl, tree init)
3832 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3835 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3836 type = TREE_TYPE (elt);
3837 if (TREE_CODE (type) == ARRAY_TYPE
3838 && TYPE_SIZE (type) == NULL_TREE
3839 && TYPE_DOMAIN (type) != NULL_TREE
3840 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3842 complete_array_type (&type, elt, false);
3844 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3845 DECL_SIZE_UNIT (decl)
3846 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3850 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3851 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3852 before the type name, and set *EXPR_CONST_OPERANDS, if
3853 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3854 appear in a constant expression. */
3857 groktypename (struct c_type_name *type_name, tree *expr,
3858 bool *expr_const_operands)
3861 tree attrs = type_name->specs->attrs;
3863 type_name->specs->attrs = NULL_TREE;
3865 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3866 false, NULL, &attrs, expr, expr_const_operands,
3869 /* Apply attributes. */
3870 decl_attributes (&type, attrs, 0);
3875 /* Decode a declarator in an ordinary declaration or data definition.
3876 This is called as soon as the type information and variable name
3877 have been parsed, before parsing the initializer if any.
3878 Here we create the ..._DECL node, fill in its type,
3879 and put it on the list of decls for the current context.
3880 The ..._DECL node is returned as the value.
3882 Exception: for arrays where the length is not specified,
3883 the type is left null, to be filled in by `finish_decl'.
3885 Function definitions do not come here; they go to start_function
3886 instead. However, external and forward declarations of functions
3887 do go through here. Structure field declarations are done by
3888 grokfield and not through here. */
3891 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3892 bool initialized, tree attributes)
3896 tree expr = NULL_TREE;
3897 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
3899 /* An object declared as __attribute__((deprecated)) suppresses
3900 warnings of uses of other deprecated items. */
3901 if (lookup_attribute ("deprecated", attributes))
3902 deprecated_state = DEPRECATED_SUPPRESS;
3904 decl = grokdeclarator (declarator, declspecs,
3905 NORMAL, initialized, NULL, &attributes, &expr, NULL,
3913 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
3914 warning (OPT_Wmain, "%q+D is usually a function", decl);
3917 /* Is it valid for this decl to have an initializer at all?
3918 If not, set INITIALIZED to zero, which will indirectly
3919 tell 'finish_decl' to ignore the initializer once it is parsed. */
3920 switch (TREE_CODE (decl))
3923 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3928 error ("function %qD is initialized like a variable", decl);
3933 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3934 error ("parameter %qD is initialized", decl);
3939 /* Don't allow initializations for incomplete types except for
3940 arrays which might be completed by the initialization. */
3942 /* This can happen if the array size is an undefined macro.
3943 We already gave a warning, so we don't need another one. */
3944 if (TREE_TYPE (decl) == error_mark_node)
3946 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3948 /* A complete type is ok if size is fixed. */
3950 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3951 || C_DECL_VARIABLE_SIZE (decl))
3953 error ("variable-sized object may not be initialized");
3957 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3959 error ("variable %qD has initializer but incomplete type", decl);
3962 else if (C_DECL_VARIABLE_SIZE (decl))
3964 /* Although C99 is unclear about whether incomplete arrays
3965 of VLAs themselves count as VLAs, it does not make
3966 sense to permit them to be initialized given that
3967 ordinary VLAs may not be initialized. */
3968 error ("variable-sized object may not be initialized");
3975 if (current_scope == file_scope)
3976 TREE_STATIC (decl) = 1;
3978 /* Tell 'pushdecl' this is an initialized decl
3979 even though we don't yet have the initializer expression.
3980 Also tell 'finish_decl' it may store the real initializer. */
3981 DECL_INITIAL (decl) = error_mark_node;
3984 /* If this is a function declaration, write a record describing it to the
3985 prototypes file (if requested). */
3987 if (TREE_CODE (decl) == FUNCTION_DECL)
3988 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3990 /* ANSI specifies that a tentative definition which is not merged with
3991 a non-tentative definition behaves exactly like a definition with an
3992 initializer equal to zero. (Section 3.7.2)
3994 -fno-common gives strict ANSI behavior, though this tends to break
3995 a large body of code that grew up without this rule.
3997 Thread-local variables are never common, since there's no entrenched
3998 body of code to break, and it allows more efficient variable references
3999 in the presence of dynamic linking. */
4001 if (TREE_CODE (decl) == VAR_DECL
4003 && TREE_PUBLIC (decl)
4004 && !DECL_THREAD_LOCAL_P (decl)
4006 DECL_COMMON (decl) = 1;
4008 /* Set attributes here so if duplicate decl, will have proper attributes. */
4009 decl_attributes (&decl, attributes, 0);
4011 /* Handle gnu_inline attribute. */
4012 if (declspecs->inline_p
4013 && !flag_gnu89_inline
4014 && TREE_CODE (decl) == FUNCTION_DECL
4015 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
4016 || current_function_decl))
4018 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
4020 else if (declspecs->storage_class != csc_static)
4021 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
4024 if (TREE_CODE (decl) == FUNCTION_DECL
4025 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
4027 struct c_declarator *ce = declarator;
4029 if (ce->kind == cdk_pointer)
4030 ce = declarator->declarator;
4031 if (ce->kind == cdk_function)
4033 tree args = ce->u.arg_info->parms;
4034 for (; args; args = TREE_CHAIN (args))
4036 tree type = TREE_TYPE (args);
4037 if (type && INTEGRAL_TYPE_P (type)
4038 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4039 DECL_ARG_TYPE (args) = integer_type_node;
4044 if (TREE_CODE (decl) == FUNCTION_DECL
4045 && DECL_DECLARED_INLINE_P (decl)
4046 && DECL_UNINLINABLE (decl)
4047 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4048 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
4051 /* C99 6.7.4p3: An inline definition of a function with external
4052 linkage shall not contain a definition of a modifiable object
4053 with static storage duration... */
4054 if (TREE_CODE (decl) == VAR_DECL
4055 && current_scope != file_scope
4056 && TREE_STATIC (decl)
4057 && !TREE_READONLY (decl)
4058 && DECL_DECLARED_INLINE_P (current_function_decl)
4059 && DECL_EXTERNAL (current_function_decl))
4060 record_inline_static (input_location, current_function_decl,
4061 decl, csi_modifiable);
4063 /* Add this decl to the current scope.
4064 TEM may equal DECL or it may be a previous decl of the same name. */
4065 tem = pushdecl (decl);
4067 if (initialized && DECL_EXTERNAL (tem))
4069 DECL_EXTERNAL (tem) = 0;
4070 TREE_STATIC (tem) = 1;
4076 /* Finish processing of a declaration;
4077 install its initial value.
4078 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4079 If the length of an array type is not known before,
4080 it must be determined now, from the initial value, or it is an error.
4082 INIT_LOC is the location of the initial value. */
4085 finish_decl (tree decl, location_t init_loc, tree init,
4086 tree origtype, tree asmspec_tree)
4089 bool was_incomplete = (DECL_SIZE (decl) == 0);
4090 const char *asmspec = 0;
4092 /* If a name was specified, get the string. */
4093 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4094 && DECL_FILE_SCOPE_P (decl))
4095 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4097 asmspec = TREE_STRING_POINTER (asmspec_tree);
4099 if (TREE_CODE (decl) == VAR_DECL
4100 && TREE_STATIC (decl)
4101 && global_bindings_p ())
4102 /* So decl is a global variable. Record the types it uses
4103 so that we can decide later to emit debug info for them. */
4104 record_types_used_by_current_var_decl (decl);
4106 /* If `start_decl' didn't like having an initialization, ignore it now. */
4107 if (init != 0 && DECL_INITIAL (decl) == 0)
4110 /* Don't crash if parm is initialized. */
4111 if (TREE_CODE (decl) == PARM_DECL)
4115 store_init_value (init_loc, decl, init, origtype);
4117 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
4118 || TREE_CODE (decl) == FUNCTION_DECL
4119 || TREE_CODE (decl) == FIELD_DECL))
4120 objc_check_decl (decl);
4122 type = TREE_TYPE (decl);
4124 /* Deduce size of array from initialization, if not already known. */
4125 if (TREE_CODE (type) == ARRAY_TYPE
4126 && TYPE_DOMAIN (type) == 0
4127 && TREE_CODE (decl) != TYPE_DECL)
4130 = (TREE_STATIC (decl)
4131 /* Even if pedantic, an external linkage array
4132 may have incomplete type at first. */
4133 ? pedantic && !TREE_PUBLIC (decl)
4134 : !DECL_EXTERNAL (decl));
4136 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
4139 /* Get the completed type made by complete_array_type. */
4140 type = TREE_TYPE (decl);
4145 error ("initializer fails to determine size of %q+D", decl);
4150 error ("array size missing in %q+D", decl);
4151 /* If a `static' var's size isn't known,
4152 make it extern as well as static, so it does not get
4154 If it is not `static', then do not mark extern;
4155 finish_incomplete_decl will give it a default size
4156 and it will get allocated. */
4157 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4158 DECL_EXTERNAL (decl) = 1;
4162 error ("zero or negative size array %q+D", decl);
4166 /* For global variables, update the copy of the type that
4167 exists in the binding. */
4168 if (TREE_PUBLIC (decl))
4170 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
4171 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
4172 b_ext = b_ext->shadowed;
4176 b_ext->u.type = composite_type (b_ext->u.type, type);
4178 b_ext->u.type = type;
4187 if (DECL_INITIAL (decl))
4188 TREE_TYPE (DECL_INITIAL (decl)) = type;
4190 layout_decl (decl, 0);
4193 if (TREE_CODE (decl) == VAR_DECL)
4195 if (init && TREE_CODE (init) == CONSTRUCTOR)
4196 add_flexible_array_elts_to_size (decl, init);
4198 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
4199 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
4200 layout_decl (decl, 0);
4202 if (DECL_SIZE (decl) == 0
4203 /* Don't give an error if we already gave one earlier. */
4204 && TREE_TYPE (decl) != error_mark_node
4205 && (TREE_STATIC (decl)
4206 /* A static variable with an incomplete type
4207 is an error if it is initialized.
4208 Also if it is not file scope.
4209 Otherwise, let it through, but if it is not `extern'
4210 then it may cause an error message later. */
4211 ? (DECL_INITIAL (decl) != 0
4212 || !DECL_FILE_SCOPE_P (decl))
4213 /* An automatic variable with an incomplete type
4215 : !DECL_EXTERNAL (decl)))
4217 error ("storage size of %q+D isn%'t known", decl);
4218 TREE_TYPE (decl) = error_mark_node;
4221 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4222 && DECL_SIZE (decl) != 0)
4224 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4225 constant_expression_warning (DECL_SIZE (decl));
4228 error ("storage size of %q+D isn%'t constant", decl);
4229 TREE_TYPE (decl) = error_mark_node;
4233 if (TREE_USED (type))
4235 TREE_USED (decl) = 1;
4236 DECL_READ_P (decl) = 1;
4240 /* If this is a function and an assembler name is specified, reset DECL_RTL
4241 so we can give it its new name. Also, update built_in_decls if it
4242 was a normal built-in. */
4243 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4245 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4246 set_builtin_user_assembler_name (decl, asmspec);
4247 set_user_assembler_name (decl, asmspec);
4250 /* If #pragma weak was used, mark the decl weak now. */
4251 maybe_apply_pragma_weak (decl);
4253 /* Output the assembler code and/or RTL code for variables and functions,
4254 unless the type is an undefined structure or union.
4255 If not, it will get done when the type is completed. */
4257 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4259 /* Determine the ELF visibility. */
4260 if (TREE_PUBLIC (decl))
4261 c_determine_visibility (decl);
4263 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4264 if (c_dialect_objc ())
4265 objc_check_decl (decl);
4269 /* If this is not a static variable, issue a warning.
4270 It doesn't make any sense to give an ASMSPEC for an
4271 ordinary, non-register local variable. Historically,
4272 GCC has accepted -- but ignored -- the ASMSPEC in
4274 if (!DECL_FILE_SCOPE_P (decl)
4275 && TREE_CODE (decl) == VAR_DECL
4276 && !C_DECL_REGISTER (decl)
4277 && !TREE_STATIC (decl))
4278 warning (0, "ignoring asm-specifier for non-static local "
4279 "variable %q+D", decl);
4281 set_user_assembler_name (decl, asmspec);
4284 if (DECL_FILE_SCOPE_P (decl))
4286 if (DECL_INITIAL (decl) == NULL_TREE
4287 || DECL_INITIAL (decl) == error_mark_node)
4288 /* Don't output anything
4289 when a tentative file-scope definition is seen.
4290 But at end of compilation, do output code for them. */
4291 DECL_DEFER_OUTPUT (decl) = 1;
4292 rest_of_decl_compilation (decl, true, 0);
4296 /* In conjunction with an ASMSPEC, the `register'
4297 keyword indicates that we should place the variable
4298 in a particular register. */
4299 if (asmspec && C_DECL_REGISTER (decl))
4301 DECL_HARD_REGISTER (decl) = 1;
4302 /* This cannot be done for a structure with volatile
4303 fields, on which DECL_REGISTER will have been
4305 if (!DECL_REGISTER (decl))
4306 error ("cannot put object with volatile field into register");
4309 if (TREE_CODE (decl) != FUNCTION_DECL)
4311 /* If we're building a variable sized type, and we might be
4312 reachable other than via the top of the current binding
4313 level, then create a new BIND_EXPR so that we deallocate
4314 the object at the right time. */
4315 /* Note that DECL_SIZE can be null due to errors. */
4316 if (DECL_SIZE (decl)
4317 && !TREE_CONSTANT (DECL_SIZE (decl))
4318 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
4321 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
4322 TREE_SIDE_EFFECTS (bind) = 1;
4324 BIND_EXPR_BODY (bind) = push_stmt_list ();
4326 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
4332 if (!DECL_FILE_SCOPE_P (decl))
4334 /* Recompute the RTL of a local array now
4335 if it used to be an incomplete type. */
4337 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
4339 /* If we used it already as memory, it must stay in memory. */
4340 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4341 /* If it's still incomplete now, no init will save it. */
4342 if (DECL_SIZE (decl) == 0)
4343 DECL_INITIAL (decl) = 0;
4348 if (TREE_CODE (decl) == TYPE_DECL)
4350 if (!DECL_FILE_SCOPE_P (decl)
4351 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
4352 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
4354 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
4357 /* At the end of a declaration, throw away any variable type sizes
4358 of types defined inside that declaration. There is no use
4359 computing them in the following function definition. */
4360 if (current_scope == file_scope)
4361 get_pending_sizes ();
4363 /* Install a cleanup (aka destructor) if one was given. */
4364 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
4366 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
4369 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
4370 tree cleanup_decl = lookup_name (cleanup_id);
4374 /* Build "cleanup(&decl)" for the destructor. */
4375 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
4376 vec = VEC_alloc (tree, gc, 1);
4377 VEC_quick_push (tree, vec, cleanup);
4378 cleanup = build_function_call_vec (DECL_SOURCE_LOCATION (decl),
4379 cleanup_decl, vec, NULL);
4380 VEC_free (tree, gc, vec);
4382 /* Don't warn about decl unused; the cleanup uses it. */
4383 TREE_USED (decl) = 1;
4384 TREE_USED (cleanup_decl) = 1;
4385 DECL_READ_P (decl) = 1;
4387 push_cleanup (decl, cleanup, false);
4392 && TREE_CODE (decl) == VAR_DECL
4393 && TREE_READONLY (decl)
4394 && !DECL_EXTERNAL (decl)
4395 && DECL_INITIAL (decl) == NULL_TREE)
4396 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4397 "uninitialized const %qD is invalid in C++", decl);
4400 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
4403 grokparm (const struct c_parm *parm)
4405 tree attrs = parm->attrs;
4406 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
4407 NULL, &attrs, NULL, NULL, DEPRECATED_NORMAL);
4409 decl_attributes (&decl, attrs, 0);
4414 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4415 and push that on the current scope. */
4418 push_parm_decl (const struct c_parm *parm)
4420 tree attrs = parm->attrs;
4423 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
4424 &attrs, NULL, NULL, DEPRECATED_NORMAL);
4425 decl_attributes (&decl, attrs, 0);
4427 decl = pushdecl (decl);
4429 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
4432 /* Mark all the parameter declarations to date as forward decls.
4433 Also diagnose use of this extension. */
4436 mark_forward_parm_decls (void)
4438 struct c_binding *b;
4440 if (pedantic && !current_scope->warned_forward_parm_decls)
4442 pedwarn (input_location, OPT_pedantic,
4443 "ISO C forbids forward parameter declarations");
4444 current_scope->warned_forward_parm_decls = true;
4447 for (b = current_scope->bindings; b; b = b->prev)
4448 if (TREE_CODE (b->decl) == PARM_DECL)
4449 TREE_ASM_WRITTEN (b->decl) = 1;
4452 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4453 literal, which may be an incomplete array type completed by the
4454 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4455 literal. NON_CONST is true if the initializers contain something
4456 that cannot occur in a constant expression. */
4459 build_compound_literal (location_t loc, tree type, tree init, bool non_const)
4461 /* We do not use start_decl here because we have a type, not a declarator;
4462 and do not use finish_decl because the decl should be stored inside
4463 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4468 if (type == error_mark_node
4469 || init == error_mark_node)
4470 return error_mark_node;
4472 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
4473 DECL_EXTERNAL (decl) = 0;
4474 TREE_PUBLIC (decl) = 0;
4475 TREE_STATIC (decl) = (current_scope == file_scope);
4476 DECL_CONTEXT (decl) = current_function_decl;
4477 TREE_USED (decl) = 1;
4478 DECL_READ_P (decl) = 1;
4479 TREE_TYPE (decl) = type;
4480 TREE_READONLY (decl) = TYPE_READONLY (type);
4481 store_init_value (loc, decl, init, NULL_TREE);
4483 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4485 int failure = complete_array_type (&TREE_TYPE (decl),
4486 DECL_INITIAL (decl), true);
4487 gcc_assert (!failure);
4489 type = TREE_TYPE (decl);
4490 TREE_TYPE (DECL_INITIAL (decl)) = type;
4493 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
4494 return error_mark_node;
4496 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
4497 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
4498 TREE_SIDE_EFFECTS (complit) = 1;
4500 layout_decl (decl, 0);
4502 if (TREE_STATIC (decl))
4504 /* This decl needs a name for the assembler output. */
4505 set_compound_literal_name (decl);
4506 DECL_DEFER_OUTPUT (decl) = 1;
4507 DECL_COMDAT (decl) = 1;
4508 DECL_ARTIFICIAL (decl) = 1;
4509 DECL_IGNORED_P (decl) = 1;
4511 rest_of_decl_compilation (decl, 1, 0);
4516 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
4517 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
4523 /* Check the type of a compound literal. Here we just check that it
4524 is valid for C++. */
4527 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
4529 if (warn_cxx_compat && type_name->specs->tag_defined_p)
4530 warning_at (loc, OPT_Wc___compat,
4531 "defining a type in a compound literal is invalid in C++");
4534 /* Determine whether TYPE is a structure with a flexible array member,
4535 or a union containing such a structure (possibly recursively). */
4538 flexible_array_type_p (tree type)
4541 switch (TREE_CODE (type))
4544 x = TYPE_FIELDS (type);
4547 while (TREE_CHAIN (x) != NULL_TREE)
4549 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
4550 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
4551 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
4552 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
4556 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
4558 if (flexible_array_type_p (TREE_TYPE (x)))
4567 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4568 replacing with appropriate values if they are invalid. */
4570 check_bitfield_type_and_width (tree *type, tree *width, tree orig_name)
4573 unsigned int max_width;
4574 unsigned HOST_WIDE_INT w;
4575 const char *name = (orig_name
4576 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
4577 : _("<anonymous>"));
4579 /* Detect and ignore out of range field width and process valid
4581 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)))
4583 error ("bit-field %qs width not an integer constant", name);
4584 *width = integer_one_node;
4588 if (TREE_CODE (*width) != INTEGER_CST)
4590 *width = c_fully_fold (*width, false, NULL);
4591 if (TREE_CODE (*width) == INTEGER_CST)
4592 pedwarn (input_location, OPT_pedantic,
4593 "bit-field %qs width not an integer constant expression",
4596 if (TREE_CODE (*width) != INTEGER_CST)
4598 error ("bit-field %qs width not an integer constant", name);
4599 *width = integer_one_node;
4601 constant_expression_warning (*width);
4602 if (tree_int_cst_sgn (*width) < 0)
4604 error ("negative width in bit-field %qs", name);
4605 *width = integer_one_node;
4607 else if (integer_zerop (*width) && orig_name)
4609 error ("zero width for bit-field %qs", name);
4610 *width = integer_one_node;
4614 /* Detect invalid bit-field type. */
4615 if (TREE_CODE (*type) != INTEGER_TYPE
4616 && TREE_CODE (*type) != BOOLEAN_TYPE
4617 && TREE_CODE (*type) != ENUMERAL_TYPE)
4619 error ("bit-field %qs has invalid type", name);
4620 *type = unsigned_type_node;
4623 type_mv = TYPE_MAIN_VARIANT (*type);
4624 if (!in_system_header
4625 && type_mv != integer_type_node
4626 && type_mv != unsigned_type_node
4627 && type_mv != boolean_type_node)
4628 pedwarn (input_location, OPT_pedantic,
4629 "type of bit-field %qs is a GCC extension", name);
4631 max_width = TYPE_PRECISION (*type);
4633 if (0 < compare_tree_int (*width, max_width))
4635 error ("width of %qs exceeds its type", name);
4637 *width = build_int_cst (NULL_TREE, w);
4640 w = tree_low_cst (*width, 1);
4642 if (TREE_CODE (*type) == ENUMERAL_TYPE)
4644 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
4646 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
4647 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
4648 warning (0, "%qs is narrower than values of its type", name);
4654 /* Print warning about variable length array if necessary. */
4657 warn_variable_length_array (tree name, tree size)
4659 int const_size = TREE_CONSTANT (size);
4661 if (!flag_isoc99 && pedantic && warn_vla != 0)
4666 pedwarn (input_location, OPT_Wvla,
4667 "ISO C90 forbids array %qE whose size "
4668 "can%'t be evaluated",
4671 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size "
4672 "can%'t be evaluated");
4677 pedwarn (input_location, OPT_Wvla,
4678 "ISO C90 forbids variable length array %qE",
4681 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array");
4684 else if (warn_vla > 0)
4690 "the size of array %qE can"
4691 "%'t be evaluated", name);
4694 "the size of array can %'t be evaluated");
4700 "variable length array %qE is used",
4704 "variable length array is used");
4709 /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to
4710 serve as the actual size-expression for a type or decl. This is
4711 like variable_size in stor-layout.c, but we make global_bindings_p
4712 return negative to avoid calls to that function from outside the
4713 front end resulting in errors at file scope, then call this version
4714 instead from front-end code. */
4717 c_variable_size (tree size)
4721 if (TREE_CONSTANT (size))
4724 size = save_expr (size);
4726 save = skip_simple_arithmetic (size);
4728 if (cfun && cfun->dont_save_pending_sizes_p)
4731 if (!global_bindings_p ())
4732 put_pending_size (save);
4737 /* Given declspecs and a declarator,
4738 determine the name and type of the object declared
4739 and construct a ..._DECL node for it.
4740 (In one case we can return a ..._TYPE node instead.
4741 For invalid input we sometimes return 0.)
4743 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4745 DECL_CONTEXT says which syntactic context this declaration is in:
4746 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4747 FUNCDEF for a function definition. Like NORMAL but a few different
4748 error messages in each case. Return value may be zero meaning
4749 this definition is too screwy to try to parse.
4750 PARM for a parameter declaration (either within a function prototype
4751 or before a function body). Make a PARM_DECL, or return void_type_node.
4752 TYPENAME if for a typename (in a cast or sizeof).
4753 Don't make a DECL node; just return the ..._TYPE node.
4754 FIELD for a struct or union field; make a FIELD_DECL.
4755 INITIALIZED is true if the decl has an initializer.
4756 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4757 representing the width of the bit-field.
4758 DECL_ATTRS points to the list of attributes that should be added to this
4759 decl. Any nested attributes that belong on the decl itself will be
4761 If EXPR is not NULL, any expressions that need to be evaluated as
4762 part of evaluating variably modified types will be stored in *EXPR.
4763 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4764 set to indicate whether operands in *EXPR can be used in constant
4766 DEPRECATED_STATE is a deprecated_states value indicating whether
4767 deprecation warnings should be suppressed.
4769 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4770 It may also be so in the PARM case, for a prototype where the
4771 argument type is specified but not the name.
4773 This function is where the complicated C meanings of `static'
4774 and `extern' are interpreted. */
4777 grokdeclarator (const struct c_declarator *declarator,
4778 struct c_declspecs *declspecs,
4779 enum decl_context decl_context, bool initialized, tree *width,
4780 tree *decl_attrs, tree *expr, bool *expr_const_operands,
4781 enum deprecated_states deprecated_state)
4783 tree type = declspecs->type;
4784 bool threadp = declspecs->thread_p;
4785 enum c_storage_class storage_class = declspecs->storage_class;
4789 int type_quals = TYPE_UNQUALIFIED;
4790 tree name = NULL_TREE;
4791 bool funcdef_flag = false;
4792 bool funcdef_syntax = false;
4793 bool size_varies = false;
4794 tree decl_attr = declspecs->decl_attr;
4795 int array_ptr_quals = TYPE_UNQUALIFIED;
4796 tree array_ptr_attrs = NULL_TREE;
4797 int array_parm_static = 0;
4798 bool array_parm_vla_unspec_p = false;
4799 tree returned_attrs = NULL_TREE;
4800 bool bitfield = width != NULL;
4802 struct c_arg_info *arg_info = 0;
4803 addr_space_t as1, as2, address_space;
4804 location_t loc = UNKNOWN_LOCATION;
4807 bool expr_const_operands_dummy;
4811 if (expr_const_operands == NULL)
4812 expr_const_operands = &expr_const_operands_dummy;
4814 *expr = declspecs->expr;
4815 *expr_const_operands = declspecs->expr_const_operands;
4817 if (decl_context == FUNCDEF)
4818 funcdef_flag = true, decl_context = NORMAL;
4820 /* Look inside a declarator for the name being declared
4821 and get it as an IDENTIFIER_NODE, for an error message. */
4823 const struct c_declarator *decl = declarator;
4834 funcdef_syntax = (decl->kind == cdk_function);
4835 decl = decl->declarator;
4839 decl = decl->declarator;
4854 gcc_assert (decl_context == PARM
4855 || decl_context == TYPENAME
4856 || (decl_context == FIELD
4857 && declarator->kind == cdk_id));
4858 gcc_assert (!initialized);
4862 /* A function definition's declarator must have the form of
4863 a function declarator. */
4865 if (funcdef_flag && !funcdef_syntax)
4868 /* If this looks like a function definition, make it one,
4869 even if it occurs where parms are expected.
4870 Then store_parm_decls will reject it and not use it as a parm. */
4871 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4872 decl_context = PARM;
4874 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4875 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
4877 if ((decl_context == NORMAL || decl_context == FIELD)
4878 && current_scope == file_scope
4879 && variably_modified_type_p (type, NULL_TREE))
4882 error_at (loc, "variably modified %qE at file scope", name);
4884 error_at (loc, "variably modified field at file scope");
4885 type = integer_type_node;
4888 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
4890 /* Diagnose defaulting to "int". */
4892 if (declspecs->default_int_p && !in_system_header)
4894 /* Issue a warning if this is an ISO C 99 program or if
4895 -Wreturn-type and this is a function, or if -Wimplicit;
4896 prefer the former warning since it is more explicit. */
4897 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4899 warn_about_return_type = 1;
4903 pedwarn_c99 (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int,
4904 "type defaults to %<int%> in declaration of %qE",
4907 pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int,
4908 "type defaults to %<int%> in type name");
4912 /* Adjust the type if a bit-field is being declared,
4913 -funsigned-bitfields applied and the type is not explicitly
4915 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4916 && TREE_CODE (type) == INTEGER_TYPE)
4917 type = unsigned_type_for (type);
4919 /* Figure out the type qualifiers for the declaration. There are
4920 two ways a declaration can become qualified. One is something
4921 like `const int i' where the `const' is explicit. Another is
4922 something like `typedef const int CI; CI i' where the type of the
4923 declaration contains the `const'. A third possibility is that
4924 there is a type qualifier on the element type of a typedefed
4925 array type, in which case we should extract that qualifier so
4926 that c_apply_type_quals_to_decl receives the full list of
4927 qualifiers to work with (C90 is not entirely clear about whether
4928 duplicate qualifiers should be diagnosed in this case, but it
4929 seems most appropriate to do so). */
4930 element_type = strip_array_types (type);
4931 constp = declspecs->const_p + TYPE_READONLY (element_type);
4932 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4933 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4934 as1 = declspecs->address_space;
4935 as2 = TYPE_ADDR_SPACE (element_type);
4936 address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1;
4938 if (pedantic && !flag_isoc99)
4941 pedwarn (loc, OPT_pedantic, "duplicate %<const%>");
4943 pedwarn (loc, OPT_pedantic, "duplicate %<restrict%>");
4945 pedwarn (loc, OPT_pedantic, "duplicate %<volatile%>");
4948 if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2)
4949 error_at (loc, "conflicting named address spaces (%s vs %s)",
4950 c_addr_space_name (as1), c_addr_space_name (as2));
4952 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4953 type = TYPE_MAIN_VARIANT (type);
4954 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4955 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4956 | (volatilep ? TYPE_QUAL_VOLATILE : 0)
4957 | ENCODE_QUAL_ADDR_SPACE (address_space));
4959 /* Warn about storage classes that are invalid for certain
4960 kinds of declarations (parameters, typenames, etc.). */
4964 || storage_class == csc_auto
4965 || storage_class == csc_register
4966 || storage_class == csc_typedef))
4968 if (storage_class == csc_auto)
4970 (current_scope == file_scope) ? 0 : OPT_pedantic,
4971 "function definition declared %<auto%>");
4972 if (storage_class == csc_register)
4973 error_at (loc, "function definition declared %<register%>");
4974 if (storage_class == csc_typedef)
4975 error_at (loc, "function definition declared %<typedef%>");
4977 error_at (loc, "function definition declared %<__thread%>");
4979 if (storage_class == csc_auto
4980 || storage_class == csc_register
4981 || storage_class == csc_typedef)
4982 storage_class = csc_none;
4984 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4986 if (decl_context == PARM && storage_class == csc_register)
4990 switch (decl_context)
4994 error_at (loc, "storage class specified for structure "
4997 error_at (loc, "storage class specified for structure field");
5001 error_at (loc, "storage class specified for parameter %qE",
5004 error_at (loc, "storage class specified for unnamed parameter");
5007 error_at (loc, "storage class specified for typename");
5010 storage_class = csc_none;
5014 else if (storage_class == csc_extern
5018 /* 'extern' with initialization is invalid if not at file scope. */
5019 if (current_scope == file_scope)
5021 /* It is fine to have 'extern const' when compiling at C
5022 and C++ intersection. */
5023 if (!(warn_cxx_compat && constp))
5024 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
5028 error_at (loc, "%qE has both %<extern%> and initializer", name);
5030 else if (current_scope == file_scope)
5032 if (storage_class == csc_auto)
5033 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
5035 if (pedantic && storage_class == csc_register)
5036 pedwarn (input_location, OPT_pedantic,
5037 "file-scope declaration of %qE specifies %<register%>", name);
5041 if (storage_class == csc_extern && funcdef_flag)
5042 error_at (loc, "nested function %qE declared %<extern%>", name);
5043 else if (threadp && storage_class == csc_none)
5045 error_at (loc, "function-scope %qE implicitly auto and declared "
5052 /* Now figure out the structure of the declarator proper.
5053 Descend through it, creating more complex types, until we reach
5054 the declared identifier (or NULL_TREE, in an absolute declarator).
5055 At each stage we maintain an unqualified version of the type
5056 together with any qualifiers that should be applied to it with
5057 c_build_qualified_type; this way, array types including
5058 multidimensional array types are first built up in unqualified
5059 form and then the qualified form is created with
5060 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5062 while (declarator && declarator->kind != cdk_id)
5064 if (type == error_mark_node)
5066 declarator = declarator->declarator;
5070 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5071 a cdk_pointer (for *...),
5072 a cdk_function (for ...(...)),
5073 a cdk_attrs (for nested attributes),
5074 or a cdk_id (for the name being declared
5075 or the place in an absolute declarator
5076 where the name was omitted).
5077 For the last case, we have just exited the loop.
5079 At this point, TYPE is the type of elements of an array,
5080 or for a function to return, or for a pointer to point to.
5081 After this sequence of ifs, TYPE is the type of the
5082 array or function or pointer, and DECLARATOR has had its
5083 outermost layer removed. */
5085 if (array_ptr_quals != TYPE_UNQUALIFIED
5086 || array_ptr_attrs != NULL_TREE
5087 || array_parm_static)
5089 /* Only the innermost declarator (making a parameter be of
5090 array type which is converted to pointer type)
5091 may have static or type qualifiers. */
5092 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5093 array_ptr_quals = TYPE_UNQUALIFIED;
5094 array_ptr_attrs = NULL_TREE;
5095 array_parm_static = 0;
5098 switch (declarator->kind)
5102 /* A declarator with embedded attributes. */
5103 tree attrs = declarator->u.attrs;
5104 const struct c_declarator *inner_decl;
5106 declarator = declarator->declarator;
5107 inner_decl = declarator;
5108 while (inner_decl->kind == cdk_attrs)
5109 inner_decl = inner_decl->declarator;
5110 if (inner_decl->kind == cdk_id)
5111 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
5112 else if (inner_decl->kind == cdk_function)
5113 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
5114 else if (inner_decl->kind == cdk_array)
5115 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
5116 returned_attrs = decl_attributes (&type,
5117 chainon (returned_attrs, attrs),
5123 tree itype = NULL_TREE;
5124 tree size = declarator->u.array.dimen;
5125 /* The index is a signed object `sizetype' bits wide. */
5126 tree index_type = c_common_signed_type (sizetype);
5128 array_ptr_quals = declarator->u.array.quals;
5129 array_ptr_attrs = declarator->u.array.attrs;
5130 array_parm_static = declarator->u.array.static_p;
5131 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
5133 declarator = declarator->declarator;
5135 /* Check for some types that there cannot be arrays of. */
5137 if (VOID_TYPE_P (type))
5140 error_at (loc, "declaration of %qE as array of voids", name);
5142 error_at (loc, "declaration of type name as array of voids");
5143 type = error_mark_node;
5146 if (TREE_CODE (type) == FUNCTION_TYPE)
5149 error_at (loc, "declaration of %qE as array of functions",
5152 error_at (loc, "declaration of type name as array of "
5154 type = error_mark_node;
5157 if (pedantic && !in_system_header && flexible_array_type_p (type))
5158 pedwarn (loc, OPT_pedantic,
5159 "invalid use of structure with flexible array member");
5161 if (size == error_mark_node)
5162 type = error_mark_node;
5164 if (type == error_mark_node)
5167 /* If size was specified, set ITYPE to a range-type for
5168 that size. Otherwise, ITYPE remains null. finish_decl
5169 may figure it out from an initial value. */
5173 bool size_maybe_const = true;
5174 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
5175 && !TREE_OVERFLOW (size));
5176 bool this_size_varies = false;
5178 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5180 STRIP_TYPE_NOPS (size);
5182 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
5185 error_at (loc, "size of array %qE has non-integer type",
5189 "size of unnamed array has non-integer type");
5190 size = integer_one_node;
5193 size = c_fully_fold (size, false, &size_maybe_const);
5195 if (pedantic && size_maybe_const && integer_zerop (size))
5198 pedwarn (loc, OPT_pedantic,
5199 "ISO C forbids zero-size array %qE", name);
5201 pedwarn (loc, OPT_pedantic,
5202 "ISO C forbids zero-size array");
5205 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
5207 constant_expression_warning (size);
5208 if (tree_int_cst_sgn (size) < 0)
5211 error_at (loc, "size of array %qE is negative", name);
5213 error_at (loc, "size of unnamed array is negative");
5214 size = integer_one_node;
5216 /* Handle a size folded to an integer constant but
5217 not an integer constant expression. */
5218 if (!size_int_const)
5220 /* If this is a file scope declaration of an
5221 ordinary identifier, this is invalid code;
5222 diagnosing it here and not subsequently
5223 treating the type as variable-length avoids
5224 more confusing diagnostics later. */
5225 if ((decl_context == NORMAL || decl_context == FIELD)
5226 && current_scope == file_scope)
5227 pedwarn (input_location, 0,
5228 "variably modified %qE at file scope",
5231 this_size_varies = size_varies = true;
5232 warn_variable_length_array (name, size);
5235 else if ((decl_context == NORMAL || decl_context == FIELD)
5236 && current_scope == file_scope)
5238 error_at (loc, "variably modified %qE at file scope", name);
5239 size = integer_one_node;
5243 /* Make sure the array size remains visibly
5244 nonconstant even if it is (eg) a const variable
5245 with known value. */
5246 this_size_varies = size_varies = true;
5247 warn_variable_length_array (name, size);
5250 if (integer_zerop (size) && !this_size_varies)
5252 /* A zero-length array cannot be represented with
5253 an unsigned index type, which is what we'll
5254 get with build_index_type. Create an
5255 open-ended range instead. */
5256 itype = build_range_type (sizetype, size, NULL_TREE);
5260 /* Arrange for the SAVE_EXPR on the inside of the
5261 MINUS_EXPR, which allows the -1 to get folded
5262 with the +1 that happens when building TYPE_SIZE. */
5264 size = c_variable_size (size);
5265 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
5266 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5267 integer_zero_node, size);
5269 /* Compute the maximum valid index, that is, size
5270 - 1. Do the calculation in index_type, so that
5271 if it is a variable the computations will be
5272 done in the proper mode. */
5273 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
5274 convert (index_type, size),
5275 convert (index_type,
5278 /* If that overflowed, the array is too big. ???
5279 While a size of INT_MAX+1 technically shouldn't
5280 cause an overflow (because we subtract 1), the
5281 overflow is recorded during the conversion to
5282 index_type, before the subtraction. Handling
5283 this case seems like an unnecessary
5285 if (TREE_CODE (itype) == INTEGER_CST
5286 && TREE_OVERFLOW (itype))
5289 error_at (loc, "size of array %qE is too large",
5292 error_at (loc, "size of unnamed array is too large");
5293 type = error_mark_node;
5297 itype = build_index_type (itype);
5299 if (this_size_varies)
5302 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5306 *expr_const_operands &= size_maybe_const;
5309 else if (decl_context == FIELD)
5311 bool flexible_array_member = false;
5312 if (array_parm_vla_unspec_p)
5313 /* Field names can in fact have function prototype
5314 scope so [*] is disallowed here through making
5315 the field variably modified, not through being
5316 something other than a declaration with function
5321 const struct c_declarator *t = declarator;
5322 while (t->kind == cdk_attrs)
5324 flexible_array_member = (t->kind == cdk_id);
5326 if (flexible_array_member
5327 && pedantic && !flag_isoc99 && !in_system_header)
5328 pedwarn (loc, OPT_pedantic,
5329 "ISO C90 does not support flexible array members");
5331 /* ISO C99 Flexible array members are effectively
5332 identical to GCC's zero-length array extension. */
5333 if (flexible_array_member || array_parm_vla_unspec_p)
5334 itype = build_range_type (sizetype, size_zero_node,
5337 else if (decl_context == PARM)
5339 if (array_parm_vla_unspec_p)
5341 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
5345 else if (decl_context == TYPENAME)
5347 if (array_parm_vla_unspec_p)
5350 warning (0, "%<[*]%> not in a declaration");
5351 /* We use this to avoid messing up with incomplete
5352 array types of the same type, that would
5353 otherwise be modified below. */
5354 itype = build_range_type (sizetype, size_zero_node,
5360 /* Complain about arrays of incomplete types. */
5361 if (!COMPLETE_TYPE_P (type))
5363 error_at (loc, "array type has incomplete element type");
5364 type = error_mark_node;
5367 /* When itype is NULL, a shared incomplete array type is
5368 returned for all array of a given type. Elsewhere we
5369 make sure we don't complete that type before copying
5370 it, but here we want to make sure we don't ever
5371 modify the shared type, so we gcc_assert (itype)
5374 addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals);
5375 if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type))
5376 type = build_qualified_type (type,
5377 ENCODE_QUAL_ADDR_SPACE (as));
5379 type = build_array_type (type, itype);
5382 if (type != error_mark_node)
5386 /* It is ok to modify type here even if itype is
5387 NULL: if size_varies, we're in a
5388 multi-dimensional array and the inner type has
5389 variable size, so the enclosing shared array type
5391 if (size && TREE_CODE (size) == INTEGER_CST)
5393 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5394 C_TYPE_VARIABLE_SIZE (type) = 1;
5397 /* The GCC extension for zero-length arrays differs from
5398 ISO flexible array members in that sizeof yields
5400 if (size && integer_zerop (size))
5403 TYPE_SIZE (type) = bitsize_zero_node;
5404 TYPE_SIZE_UNIT (type) = size_zero_node;
5405 SET_TYPE_STRUCTURAL_EQUALITY (type);
5407 if (array_parm_vla_unspec_p)
5410 /* The type is complete. C99 6.7.5.2p4 */
5411 TYPE_SIZE (type) = bitsize_zero_node;
5412 TYPE_SIZE_UNIT (type) = size_zero_node;
5413 SET_TYPE_STRUCTURAL_EQUALITY (type);
5417 if (decl_context != PARM
5418 && (array_ptr_quals != TYPE_UNQUALIFIED
5419 || array_ptr_attrs != NULL_TREE
5420 || array_parm_static))
5422 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5423 array_ptr_quals = TYPE_UNQUALIFIED;
5424 array_ptr_attrs = NULL_TREE;
5425 array_parm_static = 0;
5431 /* Say it's a definition only for the declarator closest
5432 to the identifier, apart possibly from some
5434 bool really_funcdef = false;
5438 const struct c_declarator *t = declarator->declarator;
5439 while (t->kind == cdk_attrs)
5441 really_funcdef = (t->kind == cdk_id);
5444 /* Declaring a function type. Make sure we have a valid
5445 type for the function to return. */
5446 if (type == error_mark_node)
5449 size_varies = false;
5451 /* Warn about some types functions can't return. */
5452 if (TREE_CODE (type) == FUNCTION_TYPE)
5455 error_at (loc, "%qE declared as function returning a "
5458 error_at (loc, "type name declared as function "
5459 "returning a function");
5460 type = integer_type_node;
5462 if (TREE_CODE (type) == ARRAY_TYPE)
5465 error_at (loc, "%qE declared as function returning an array",
5468 error_at (loc, "type name declared as function returning "
5470 type = integer_type_node;
5472 errmsg = targetm.invalid_return_type (type);
5476 type = integer_type_node;
5479 /* Construct the function type and go to the next
5480 inner layer of declarator. */
5481 arg_info = declarator->u.arg_info;
5482 arg_types = grokparms (arg_info, really_funcdef);
5484 put_pending_sizes (arg_info->pending_sizes);
5486 /* Type qualifiers before the return type of the function
5487 qualify the return type, not the function type. */
5490 /* Type qualifiers on a function return type are
5491 normally permitted by the standard but have no
5492 effect, so give a warning at -Wreturn-type.
5493 Qualifiers on a void return type are banned on
5494 function definitions in ISO C; GCC used to used
5495 them for noreturn functions. */
5496 if (VOID_TYPE_P (type) && really_funcdef)
5498 "function definition has qualified void return type");
5500 warning_at (loc, OPT_Wignored_qualifiers,
5501 "type qualifiers ignored on function return type");
5503 type = c_build_qualified_type (type, type_quals);
5505 type_quals = TYPE_UNQUALIFIED;
5507 type = build_function_type (type, arg_types);
5508 declarator = declarator->declarator;
5510 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5511 the formal parameter list of this FUNCTION_TYPE to point to
5512 the FUNCTION_TYPE node itself. */
5516 for (link = arg_info->tags;
5518 link = TREE_CHAIN (link))
5519 TYPE_CONTEXT (TREE_VALUE (link)) = type;
5525 /* Merge any constancy or volatility into the target type
5528 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5530 pedwarn (loc, OPT_pedantic,
5531 "ISO C forbids qualified function types");
5533 type = c_build_qualified_type (type, type_quals);
5534 size_varies = false;
5536 /* When the pointed-to type involves components of variable size,
5537 care must be taken to ensure that the size evaluation code is
5538 emitted early enough to dominate all the possible later uses
5539 and late enough for the variables on which it depends to have
5542 This is expected to happen automatically when the pointed-to
5543 type has a name/declaration of it's own, but special attention
5544 is required if the type is anonymous.
5546 We handle the NORMAL and FIELD contexts here by attaching an
5547 artificial TYPE_DECL to such pointed-to type. This forces the
5548 sizes evaluation at a safe point and ensures it is not deferred
5549 until e.g. within a deeper conditional context.
5551 We expect nothing to be needed here for PARM or TYPENAME.
5552 Pushing a TYPE_DECL at this point for TYPENAME would actually
5553 be incorrect, as we might be in the middle of an expression
5554 with side effects on the pointed-to type size "arguments" prior
5555 to the pointer declaration point and the fake TYPE_DECL in the
5556 enclosing context would force the size evaluation prior to the
5559 if (!TYPE_NAME (type)
5560 && (decl_context == NORMAL || decl_context == FIELD)
5561 && variably_modified_type_p (type, NULL_TREE))
5563 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
5564 DECL_ARTIFICIAL (decl) = 1;
5566 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
5567 TYPE_NAME (type) = decl;
5570 type = build_pointer_type (type);
5572 /* Process type qualifiers (such as const or volatile)
5573 that were given inside the `*'. */
5574 type_quals = declarator->u.pointer_quals;
5576 declarator = declarator->declarator;
5583 *decl_attrs = chainon (returned_attrs, *decl_attrs);
5585 /* Now TYPE has the actual type, apart from any qualifiers in
5588 /* Warn about address space used for things other than static memory or
5590 address_space = DECODE_QUAL_ADDR_SPACE (type_quals);
5591 if (!ADDR_SPACE_GENERIC_P (address_space))
5593 if (decl_context == NORMAL)
5595 switch (storage_class)
5598 error ("%qs combined with %<auto%> qualifier for %qE",
5599 c_addr_space_name (address_space), name);
5602 error ("%qs combined with %<register%> qualifier for %qE",
5603 c_addr_space_name (address_space), name);
5606 if (current_function_scope)
5608 error ("%qs specified for auto variable %qE",
5609 c_addr_space_name (address_space), name);
5621 else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE)
5624 error ("%qs specified for parameter %qE",
5625 c_addr_space_name (address_space), name);
5627 error ("%qs specified for unnamed parameter",
5628 c_addr_space_name (address_space));
5630 else if (decl_context == FIELD)
5633 error ("%qs specified for structure field %qE",
5634 c_addr_space_name (address_space), name);
5636 error ("%qs specified for structure field",
5637 c_addr_space_name (address_space));
5641 /* Check the type and width of a bit-field. */
5643 check_bitfield_type_and_width (&type, width, name);
5645 /* Did array size calculations overflow? */
5647 if (TREE_CODE (type) == ARRAY_TYPE
5648 && COMPLETE_TYPE_P (type)
5649 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
5650 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
5653 error_at (loc, "size of array %qE is too large", name);
5655 error_at (loc, "size of unnamed array is too large");
5656 /* If we proceed with the array type as it is, we'll eventually
5657 crash in tree_low_cst(). */
5658 type = error_mark_node;
5661 /* If this is declaring a typedef name, return a TYPE_DECL. */
5663 if (storage_class == csc_typedef)
5666 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5668 pedwarn (loc, OPT_pedantic,
5669 "ISO C forbids qualified function types");
5671 type = c_build_qualified_type (type, type_quals);
5672 decl = build_decl (declarator->id_loc,
5673 TYPE_DECL, declarator->u.id, type);
5674 if (declspecs->explicit_signed_p)
5675 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5676 if (declspecs->inline_p)
5677 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
5679 if (warn_cxx_compat && declarator->u.id != NULL_TREE)
5681 struct c_binding *b = I_TAG_BINDING (declarator->u.id);
5684 && b->decl != NULL_TREE
5685 && (B_IN_CURRENT_SCOPE (b)
5686 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
5687 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
5689 warning_at (declarator->id_loc, OPT_Wc___compat,
5690 ("using %qD as both a typedef and a tag is "
5693 if (b->locus != UNKNOWN_LOCATION)
5694 inform (b->locus, "originally defined here");
5701 /* If this is a type name (such as, in a cast or sizeof),
5702 compute the type and return it now. */
5704 if (decl_context == TYPENAME)
5706 /* Note that the grammar rejects storage classes in typenames
5708 gcc_assert (storage_class == csc_none && !threadp
5709 && !declspecs->inline_p);
5710 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5712 pedwarn (loc, OPT_pedantic,
5713 "ISO C forbids const or volatile function types");
5715 type = c_build_qualified_type (type, type_quals);
5719 if (pedantic && decl_context == FIELD
5720 && variably_modified_type_p (type, NULL_TREE))
5723 pedwarn (loc, OPT_pedantic, "a member of a structure or union cannot "
5724 "have a variably modified type");
5727 /* Aside from typedefs and type names (handle above),
5728 `void' at top level (not within pointer)
5729 is allowed only in public variables.
5730 We don't complain about parms either, but that is because
5731 a better error message can be made later. */
5733 if (VOID_TYPE_P (type) && decl_context != PARM
5734 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5735 && (storage_class == csc_extern
5736 || (current_scope == file_scope
5737 && !(storage_class == csc_static
5738 || storage_class == csc_register)))))
5740 error_at (loc, "variable or field %qE declared void", name);
5741 type = integer_type_node;
5744 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5745 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5750 if (decl_context == PARM)
5754 /* A parameter declared as an array of T is really a pointer to T.
5755 One declared as a function is really a pointer to a function. */
5757 if (TREE_CODE (type) == ARRAY_TYPE)
5759 /* Transfer const-ness of array into that of type pointed to. */
5760 type = TREE_TYPE (type);
5762 type = c_build_qualified_type (type, type_quals);
5763 type = build_pointer_type (type);
5764 type_quals = array_ptr_quals;
5766 type = c_build_qualified_type (type, type_quals);
5768 /* We don't yet implement attributes in this context. */
5769 if (array_ptr_attrs != NULL_TREE)
5770 warning_at (loc, OPT_Wattributes,
5771 "attributes in parameter array declarator ignored");
5773 size_varies = false;
5775 else if (TREE_CODE (type) == FUNCTION_TYPE)
5778 pedwarn (loc, OPT_pedantic,
5779 "ISO C forbids qualified function types");
5781 type = c_build_qualified_type (type, type_quals);
5782 type = build_pointer_type (type);
5783 type_quals = TYPE_UNQUALIFIED;
5785 else if (type_quals)
5786 type = c_build_qualified_type (type, type_quals);
5788 decl = build_decl (declarator->id_loc,
5789 PARM_DECL, declarator->u.id, type);
5791 C_DECL_VARIABLE_SIZE (decl) = 1;
5793 /* Compute the type actually passed in the parmlist,
5794 for the case where there is no prototype.
5795 (For example, shorts and chars are passed as ints.)
5796 When there is a prototype, this is overridden later. */
5798 if (type == error_mark_node)
5799 promoted_type = type;
5801 promoted_type = c_type_promotes_to (type);
5803 DECL_ARG_TYPE (decl) = promoted_type;
5804 if (declspecs->inline_p)
5805 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
5807 else if (decl_context == FIELD)
5809 /* Note that the grammar rejects storage classes in typenames
5811 gcc_assert (storage_class == csc_none && !threadp
5812 && !declspecs->inline_p);
5814 /* Structure field. It may not be a function. */
5816 if (TREE_CODE (type) == FUNCTION_TYPE)
5818 error_at (loc, "field %qE declared as a function", name);
5819 type = build_pointer_type (type);
5821 else if (TREE_CODE (type) != ERROR_MARK
5822 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
5825 error_at (loc, "field %qE has incomplete type", name);
5827 error_at (loc, "unnamed field has incomplete type");
5828 type = error_mark_node;
5830 type = c_build_qualified_type (type, type_quals);
5831 decl = build_decl (declarator->id_loc,
5832 FIELD_DECL, declarator->u.id, type);
5833 DECL_NONADDRESSABLE_P (decl) = bitfield;
5834 if (bitfield && !declarator->u.id)
5835 TREE_NO_WARNING (decl) = 1;
5838 C_DECL_VARIABLE_SIZE (decl) = 1;
5840 else if (TREE_CODE (type) == FUNCTION_TYPE)
5842 if (storage_class == csc_register || threadp)
5844 error_at (loc, "invalid storage class for function %qE", name);
5846 else if (current_scope != file_scope)
5848 /* Function declaration not at file scope. Storage
5849 classes other than `extern' are not allowed, C99
5850 6.7.1p5, and `extern' makes no difference. However,
5851 GCC allows 'auto', perhaps with 'inline', to support
5852 nested functions. */
5853 if (storage_class == csc_auto)
5854 pedwarn (loc, OPT_pedantic,
5855 "invalid storage class for function %qE", name);
5856 else if (storage_class == csc_static)
5858 error_at (loc, "invalid storage class for function %qE", name);
5860 storage_class = declspecs->storage_class = csc_none;
5866 decl = build_decl (declarator->id_loc,
5867 FUNCTION_DECL, declarator->u.id, type);
5868 decl = build_decl_attribute_variant (decl, decl_attr);
5870 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
5871 pedwarn (loc, OPT_pedantic,
5872 "ISO C forbids qualified function types");
5874 /* GNU C interprets a volatile-qualified function type to indicate
5875 that the function does not return. */
5876 if ((type_quals & TYPE_QUAL_VOLATILE)
5877 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
5878 warning_at (loc, 0, "%<noreturn%> function returns non-void value");
5880 /* Every function declaration is an external reference
5881 (DECL_EXTERNAL) except for those which are not at file
5882 scope and are explicitly declared "auto". This is
5883 forbidden by standard C (C99 6.7.1p5) and is interpreted by
5884 GCC to signify a forward declaration of a nested function. */
5885 if (storage_class == csc_auto && current_scope != file_scope)
5886 DECL_EXTERNAL (decl) = 0;
5887 /* In C99, a function which is declared 'inline' with 'extern'
5888 is not an external reference (which is confusing). It
5889 means that the later definition of the function must be output
5890 in this file, C99 6.7.4p6. In GNU C89, a function declared
5891 'extern inline' is an external reference. */
5892 else if (declspecs->inline_p && storage_class != csc_static)
5893 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
5894 == flag_gnu89_inline);
5896 DECL_EXTERNAL (decl) = !initialized;
5898 /* Record absence of global scope for `static' or `auto'. */
5900 = !(storage_class == csc_static || storage_class == csc_auto);
5902 /* For a function definition, record the argument information
5903 block where store_parm_decls will look for it. */
5905 current_function_arg_info = arg_info;
5907 if (declspecs->default_int_p)
5908 C_FUNCTION_IMPLICIT_INT (decl) = 1;
5910 /* Record presence of `inline', if it is reasonable. */
5911 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
5913 if (declspecs->inline_p)
5914 pedwarn (loc, 0, "cannot inline function %<main%>");
5916 else if (declspecs->inline_p)
5917 /* Record that the function is declared `inline'. */
5918 DECL_DECLARED_INLINE_P (decl) = 1;
5922 /* It's a variable. */
5923 /* An uninitialized decl with `extern' is a reference. */
5924 int extern_ref = !initialized && storage_class == csc_extern;
5926 type = c_build_qualified_type (type, type_quals);
5928 /* C99 6.2.2p7: It is invalid (compile-time undefined
5929 behavior) to create an 'extern' declaration for a
5930 variable if there is a global declaration that is
5931 'static' and the global declaration is not visible.
5932 (If the static declaration _is_ currently visible,
5933 the 'extern' declaration is taken to refer to that decl.) */
5934 if (extern_ref && current_scope != file_scope)
5936 tree global_decl = identifier_global_value (declarator->u.id);
5937 tree visible_decl = lookup_name (declarator->u.id);
5940 && global_decl != visible_decl
5941 && TREE_CODE (global_decl) == VAR_DECL
5942 && !TREE_PUBLIC (global_decl))
5943 error_at (loc, "variable previously declared %<static%> "
5944 "redeclared %<extern%>");
5947 decl = build_decl (declarator->id_loc,
5948 VAR_DECL, declarator->u.id, type);
5950 C_DECL_VARIABLE_SIZE (decl) = 1;
5952 if (declspecs->inline_p)
5953 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
5955 /* At file scope, an initialized extern declaration may follow
5956 a static declaration. In that case, DECL_EXTERNAL will be
5957 reset later in start_decl. */
5958 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
5960 /* At file scope, the presence of a `static' or `register' storage
5961 class specifier, or the absence of all storage class specifiers
5962 makes this declaration a definition (perhaps tentative). Also,
5963 the absence of `static' makes it public. */
5964 if (current_scope == file_scope)
5966 TREE_PUBLIC (decl) = storage_class != csc_static;
5967 TREE_STATIC (decl) = !extern_ref;
5969 /* Not at file scope, only `static' makes a static definition. */
5972 TREE_STATIC (decl) = (storage_class == csc_static);
5973 TREE_PUBLIC (decl) = extern_ref;
5977 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
5980 if ((storage_class == csc_extern
5981 || (storage_class == csc_none
5982 && TREE_CODE (type) == FUNCTION_TYPE
5984 && variably_modified_type_p (type, NULL_TREE))
5987 if (TREE_CODE (type) == FUNCTION_TYPE)
5988 error_at (loc, "non-nested function with variably modified type");
5990 error_at (loc, "object with variably modified type must have "
5994 /* Record `register' declaration for warnings on &
5995 and in case doing stupid register allocation. */
5997 if (storage_class == csc_register)
5999 C_DECL_REGISTER (decl) = 1;
6000 DECL_REGISTER (decl) = 1;
6003 /* Record constancy and volatility. */
6004 c_apply_type_quals_to_decl (type_quals, decl);
6006 /* If a type has volatile components, it should be stored in memory.
6007 Otherwise, the fact that those components are volatile
6008 will be ignored, and would even crash the compiler.
6009 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6010 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
6011 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
6012 || TREE_CODE (decl) == RESULT_DECL))
6014 /* It is not an error for a structure with volatile fields to
6015 be declared register, but reset DECL_REGISTER since it
6016 cannot actually go in a register. */
6017 int was_reg = C_DECL_REGISTER (decl);
6018 C_DECL_REGISTER (decl) = 0;
6019 DECL_REGISTER (decl) = 0;
6020 c_mark_addressable (decl);
6021 C_DECL_REGISTER (decl) = was_reg;
6024 /* This is the earliest point at which we might know the assembler
6025 name of a variable. Thus, if it's known before this, die horribly. */
6026 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
6029 && TREE_CODE (decl) == VAR_DECL
6030 && TREE_PUBLIC (decl)
6031 && TREE_STATIC (decl)
6032 && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
6033 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
6034 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
6035 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
6036 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
6037 ("non-local variable %qD with anonymous type is "
6038 "questionable in C++"),
6045 /* Decode the parameter-list info for a function type or function definition.
6046 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6047 if there is an identifier list instead of a parameter decl list).
6048 These two functions are separate because when a function returns
6049 or receives functions then each is called multiple times but the order
6050 of calls is different. The last call to `grokparms' is always the one
6051 that contains the formal parameter names of a function definition.
6053 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6055 FUNCDEF_FLAG is true for a function definition, false for
6056 a mere declaration. A nonempty identifier-list gets an error message
6057 when FUNCDEF_FLAG is false. */
6060 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
6062 tree arg_types = arg_info->types;
6064 if (funcdef_flag && arg_info->had_vla_unspec)
6066 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6068 error ("%<[*]%> not allowed in other than function prototype scope");
6071 if (arg_types == 0 && !funcdef_flag && !in_system_header)
6072 warning (OPT_Wstrict_prototypes,
6073 "function declaration isn%'t a prototype");
6075 if (arg_types == error_mark_node)
6076 return 0; /* don't set TYPE_ARG_TYPES in this case */
6078 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
6081 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
6083 arg_info->parms = arg_info->types;
6084 arg_info->types = 0;
6089 tree parm, type, typelt;
6090 unsigned int parmno;
6093 /* If there is a parameter of incomplete type in a definition,
6094 this is an error. In a declaration this is valid, and a
6095 struct or union type may be completed later, before any calls
6096 or definition of the function. In the case where the tag was
6097 first declared within the parameter list, a warning has
6098 already been given. If a parameter has void type, then
6099 however the function cannot be defined or called, so
6102 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
6104 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
6106 type = TREE_VALUE (typelt);
6107 if (type == error_mark_node)
6110 if (!COMPLETE_TYPE_P (type))
6114 if (DECL_NAME (parm))
6115 error_at (input_location,
6116 "parameter %u (%q+D) has incomplete type",
6119 error_at (DECL_SOURCE_LOCATION (parm),
6120 "parameter %u has incomplete type",
6123 TREE_VALUE (typelt) = error_mark_node;
6124 TREE_TYPE (parm) = error_mark_node;
6125 arg_types = NULL_TREE;
6127 else if (VOID_TYPE_P (type))
6129 if (DECL_NAME (parm))
6130 warning_at (input_location, 0,
6131 "parameter %u (%q+D) has void type",
6134 warning_at (DECL_SOURCE_LOCATION (parm), 0,
6135 "parameter %u has void type",
6140 errmsg = targetm.invalid_parameter_type (type);
6144 TREE_VALUE (typelt) = error_mark_node;
6145 TREE_TYPE (parm) = error_mark_node;
6146 arg_types = NULL_TREE;
6149 if (DECL_NAME (parm) && TREE_USED (parm))
6150 warn_if_shadowing (parm);
6156 /* Take apart the current scope and return a c_arg_info structure with
6157 info on a parameter list just parsed.
6159 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6161 ELLIPSIS being true means the argument list ended in '...' so don't
6162 append a sentinel (void_list_node) to the end of the type-list. */
6165 get_parm_info (bool ellipsis)
6167 struct c_binding *b = current_scope->bindings;
6168 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
6175 static bool explained_incomplete_types = false;
6176 bool gave_void_only_once_err = false;
6178 arg_info->parms = 0;
6180 arg_info->types = 0;
6181 arg_info->others = 0;
6182 arg_info->pending_sizes = 0;
6183 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
6185 /* The bindings in this scope must not get put into a block.
6186 We will take care of deleting the binding nodes. */
6187 current_scope->bindings = 0;
6189 /* This function is only called if there was *something* on the
6193 /* A parameter list consisting solely of 'void' indicates that the
6194 function takes no arguments. But if the 'void' is qualified
6195 (by 'const' or 'volatile'), or has a storage class specifier
6196 ('register'), then the behavior is undefined; issue an error.
6197 Typedefs for 'void' are OK (see DR#157). */
6198 if (b->prev == 0 /* one binding */
6199 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
6200 && !DECL_NAME (b->decl) /* anonymous */
6201 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
6203 if (TREE_THIS_VOLATILE (b->decl)
6204 || TREE_READONLY (b->decl)
6205 || C_DECL_REGISTER (b->decl))
6206 error ("%<void%> as only parameter may not be qualified");
6208 /* There cannot be an ellipsis. */
6210 error ("%<void%> must be the only parameter");
6212 arg_info->types = void_list_node;
6217 types = void_list_node;
6219 /* Break up the bindings list into parms, tags, types, and others;
6220 apply sanity checks; purge the name-to-decl bindings. */
6223 tree decl = b->decl;
6224 tree type = TREE_TYPE (decl);
6225 const char *keyword;
6227 switch (TREE_CODE (decl))
6232 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6233 I_SYMBOL_BINDING (b->id) = b->shadowed;
6236 /* Check for forward decls that never got their actual decl. */
6237 if (TREE_ASM_WRITTEN (decl))
6238 error ("parameter %q+D has just a forward declaration", decl);
6239 /* Check for (..., void, ...) and issue an error. */
6240 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
6242 if (!gave_void_only_once_err)
6244 error ("%<void%> must be the only parameter");
6245 gave_void_only_once_err = true;
6250 /* Valid parameter, add it to the list. */
6251 TREE_CHAIN (decl) = parms;
6254 /* Since there is a prototype, args are passed in their
6255 declared types. The back end may override this later. */
6256 DECL_ARG_TYPE (decl) = type;
6257 types = tree_cons (0, type, types);
6261 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
6262 case UNION_TYPE: keyword = "union"; goto tag;
6263 case RECORD_TYPE: keyword = "struct"; goto tag;
6265 /* Types may not have tag-names, in which case the type
6266 appears in the bindings list with b->id NULL. */
6269 gcc_assert (I_TAG_BINDING (b->id) == b);
6270 I_TAG_BINDING (b->id) = b->shadowed;
6273 /* Warn about any struct, union or enum tags defined in a
6274 parameter list. The scope of such types is limited to
6275 the parameter list, which is rarely if ever desirable
6276 (it's impossible to call such a function with type-
6277 correct arguments). An anonymous union parm type is
6278 meaningful as a GNU extension, so don't warn for that. */
6279 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
6282 /* The %s will be one of 'struct', 'union', or 'enum'. */
6283 warning (0, "%<%s %E%> declared inside parameter list",
6286 /* The %s will be one of 'struct', 'union', or 'enum'. */
6287 warning (0, "anonymous %s declared inside parameter list",
6290 if (!explained_incomplete_types)
6292 warning (0, "its scope is only this definition or declaration,"
6293 " which is probably not what you want");
6294 explained_incomplete_types = true;
6298 tags = tree_cons (b->id, decl, tags);
6304 /* CONST_DECLs appear here when we have an embedded enum,
6305 and TYPE_DECLs appear here when we have an embedded struct
6306 or union. No warnings for this - we already warned about the
6307 type itself. FUNCTION_DECLs appear when there is an implicit
6308 function declaration in the parameter list. */
6310 /* When we reinsert this decl in the function body, we need
6311 to reconstruct whether it was marked as nested. */
6312 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6315 TREE_CHAIN (decl) = others;
6320 /* error_mark_node appears here when we have an undeclared
6321 variable. Just throw it away. */
6324 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6325 I_SYMBOL_BINDING (b->id) = b->shadowed;
6329 /* Other things that might be encountered. */
6336 b = free_binding_and_advance (b);
6339 arg_info->parms = parms;
6340 arg_info->tags = tags;
6341 arg_info->types = types;
6342 arg_info->others = others;
6343 arg_info->pending_sizes = get_pending_sizes ();
6347 /* Get the struct, enum or union (CODE says which) with tag NAME.
6348 Define the tag as a forward-reference with location LOC if it is
6349 not defined. Return a c_typespec structure for the type
6353 parser_xref_tag (location_t loc, enum tree_code code, tree name)
6355 struct c_typespec ret;
6359 ret.expr = NULL_TREE;
6360 ret.expr_const_operands = true;
6362 /* If a cross reference is requested, look up the type
6363 already defined for this tag and return it. */
6365 ref = lookup_tag (code, name, 0, &refloc);
6366 /* If this is the right type of tag, return what we found.
6367 (This reference will be shadowed by shadow_tag later if appropriate.)
6368 If this is the wrong type of tag, do not return it. If it was the
6369 wrong type in the same scope, we will have had an error
6370 message already; if in a different scope and declaring
6371 a name, pending_xref_error will give an error message; but if in a
6372 different scope and not declaring a name, this tag should
6373 shadow the previous declaration of a different type of tag, and
6374 this would not work properly if we return the reference found.
6375 (For example, with "struct foo" in an outer scope, "union foo;"
6376 must shadow that tag with a new one of union type.) */
6377 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
6378 if (ref && TREE_CODE (ref) == code)
6380 if (C_TYPE_DEFINED_IN_STRUCT (ref)
6381 && loc != UNKNOWN_LOCATION
6387 warning_at (loc, OPT_Wc___compat,
6388 ("enum type defined in struct or union "
6389 "is not visible in C++"));
6390 inform (refloc, "enum type defined here");
6393 warning_at (loc, OPT_Wc___compat,
6394 ("struct defined in struct or union "
6395 "is not visible in C++"));
6396 inform (refloc, "struct defined here");
6399 warning_at (loc, OPT_Wc___compat,
6400 ("union defined in struct or union "
6401 "is not visible in C++"));
6402 inform (refloc, "union defined here");
6413 /* If no such tag is yet defined, create a forward-reference node
6414 and record it as the "definition".
6415 When a real declaration of this type is found,
6416 the forward-reference will be altered into a real type. */
6418 ref = make_node (code);
6419 if (code == ENUMERAL_TYPE)
6421 /* Give the type a default layout like unsigned int
6422 to avoid crashing if it does not get defined. */
6423 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
6424 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
6425 TYPE_USER_ALIGN (ref) = 0;
6426 TYPE_UNSIGNED (ref) = 1;
6427 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
6428 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
6429 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
6432 pushtag (loc, name, ref);
6438 /* Get the struct, enum or union (CODE says which) with tag NAME.
6439 Define the tag as a forward-reference if it is not defined.
6440 Return a tree for the type. */
6443 xref_tag (enum tree_code code, tree name)
6445 return parser_xref_tag (input_location, code, name).spec;
6448 /* Make sure that the tag NAME is defined *in the current scope*
6449 at least as a forward reference.
6450 LOC is the location of the struct's definition.
6451 CODE says which kind of tag NAME ought to be.
6453 This stores the current value of the file static STRUCT_PARSE_INFO
6454 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6455 new c_struct_parse_info structure. The old value of
6456 STRUCT_PARSE_INFO is restored in finish_struct. */
6459 start_struct (location_t loc, enum tree_code code, tree name,
6460 struct c_struct_parse_info **enclosing_struct_parse_info)
6462 /* If there is already a tag defined at this scope
6463 (as a forward reference), just return it. */
6465 tree ref = NULL_TREE;
6466 location_t refloc = UNKNOWN_LOCATION;
6468 if (name != NULL_TREE)
6469 ref = lookup_tag (code, name, 1, &refloc);
6470 if (ref && TREE_CODE (ref) == code)
6472 if (TYPE_SIZE (ref))
6474 if (code == UNION_TYPE)
6475 error_at (loc, "redefinition of %<union %E%>", name);
6477 error_at (loc, "redefinition of %<struct %E%>", name);
6478 if (refloc != UNKNOWN_LOCATION)
6479 inform (refloc, "originally defined here");
6480 /* Don't create structures using a name already in use. */
6483 else if (C_TYPE_BEING_DEFINED (ref))
6485 if (code == UNION_TYPE)
6486 error_at (loc, "nested redefinition of %<union %E%>", name);
6488 error_at (loc, "nested redefinition of %<struct %E%>", name);
6489 /* Don't bother to report "originally defined here" for a
6490 nested redefinition; the original definition should be
6492 /* Don't create structures that contain themselves. */
6497 /* Otherwise create a forward-reference just so the tag is in scope. */
6499 if (ref == NULL_TREE || TREE_CODE (ref) != code)
6501 ref = make_node (code);
6502 pushtag (loc, name, ref);
6505 C_TYPE_BEING_DEFINED (ref) = 1;
6506 TYPE_PACKED (ref) = flag_pack_struct;
6508 *enclosing_struct_parse_info = struct_parse_info;
6509 struct_parse_info = XNEW (struct c_struct_parse_info);
6510 struct_parse_info->struct_types = VEC_alloc (tree, heap, 0);
6511 struct_parse_info->fields = VEC_alloc (c_binding_ptr, heap, 0);
6512 struct_parse_info->typedefs_seen = VEC_alloc (tree, heap, 0);
6514 /* FIXME: This will issue a warning for a use of a type defined
6515 within a statement expr used within sizeof, et. al. This is not
6516 terribly serious as C++ doesn't permit statement exprs within
6518 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
6519 warning_at (loc, OPT_Wc___compat,
6520 "defining type in %qs expression is invalid in C++",
6523 : (in_typeof ? "typeof" : "alignof")));
6528 /* Process the specs, declarator and width (NULL if omitted)
6529 of a structure component, returning a FIELD_DECL node.
6530 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6531 DECL_ATTRS is as for grokdeclarator.
6533 LOC is the location of the structure component.
6535 This is done during the parsing of the struct declaration.
6536 The FIELD_DECL nodes are chained together and the lot of them
6537 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6540 grokfield (location_t loc,
6541 struct c_declarator *declarator, struct c_declspecs *declspecs,
6542 tree width, tree *decl_attrs)
6546 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
6547 && width == NULL_TREE)
6549 /* This is an unnamed decl.
6551 If we have something of the form "union { list } ;" then this
6552 is the anonymous union extension. Similarly for struct.
6554 If this is something of the form "struct foo;", then
6555 If MS extensions are enabled, this is handled as an
6557 Otherwise this is a forward declaration of a structure tag.
6559 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6560 If foo names a structure or union without a tag, then this
6561 is an anonymous struct (this is permitted by C1X).
6562 If MS extensions are enabled and foo names a structure, then
6563 again this is an anonymous struct.
6564 Otherwise this is an error.
6566 Oh what a horrid tangled web we weave. I wonder if MS consciously
6567 took this from Plan 9 or if it was an accident of implementation
6568 that took root before someone noticed the bug... */
6570 tree type = declspecs->type;
6571 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
6572 || TREE_CODE (type) == UNION_TYPE);
6577 if (flag_ms_extensions)
6579 else if (TYPE_NAME (TYPE_MAIN_VARIANT (type)) == NULL)
6586 pedwarn (loc, 0, "declaration does not declare anything");
6592 pedwarn (loc, OPT_pedantic,
6593 "ISO C99 doesn%'t support unnamed structs/unions");
6595 pedwarn (loc, OPT_pedantic,
6596 "ISO C90 doesn%'t support unnamed structs/unions");
6600 value = grokdeclarator (declarator, declspecs, FIELD, false,
6601 width ? &width : NULL, decl_attrs, NULL, NULL,
6604 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
6605 DECL_INITIAL (value) = width;
6607 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
6609 /* If we currently have a binding for this field, set the
6610 in_struct field in the binding, so that we warn about lookups
6612 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
6615 /* If the in_struct field is not yet set, push it on a list
6616 to be cleared when this struct is finished. */
6619 VEC_safe_push (c_binding_ptr, heap,
6620 struct_parse_info->fields, b);
6629 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
6630 to HTAB, giving errors for any duplicates. */
6633 detect_field_duplicates_hash (tree fieldlist, htab_t htab)
6638 for (x = fieldlist; x ; x = TREE_CHAIN (x))
6639 if ((y = DECL_NAME (x)) != 0)
6641 slot = htab_find_slot (htab, y, INSERT);
6644 error ("duplicate member %q+D", x);
6645 DECL_NAME (x) = NULL_TREE;
6649 else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
6650 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
6651 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab);
6654 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6655 the list such that this does not present a problem later. */
6658 detect_field_duplicates (tree fieldlist)
6663 /* First, see if there are more than "a few" fields.
6664 This is trivially true if there are zero or one fields. */
6667 x = TREE_CHAIN (fieldlist);
6672 if (DECL_NAME (x) == NULL_TREE
6673 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
6674 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
6677 } while (timeout > 0 && x);
6679 /* If there were "few" fields and no anonymous structures or unions,
6680 avoid the overhead of allocating a hash table. Instead just do
6681 the nested traversal thing. */
6684 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
6687 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
6688 if (DECL_NAME (y) == DECL_NAME (x))
6690 error ("duplicate member %q+D", x);
6691 DECL_NAME (x) = NULL_TREE;
6697 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
6699 detect_field_duplicates_hash (fieldlist, htab);
6704 /* Finish up struct info used by -Wc++-compat. */
6707 warn_cxx_compat_finish_struct (tree fieldlist)
6711 struct c_binding *b;
6713 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
6714 the current struct. We do this now at the end of the struct
6715 because the flag is used to issue visibility warnings, and we
6716 only want to issue those warnings if the type is referenced
6717 outside of the struct declaration. */
6718 for (ix = 0; VEC_iterate (tree, struct_parse_info->struct_types, ix, x); ++ix)
6719 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
6721 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
6722 typedefs used when declaring fields in this struct. If the name
6723 of any of the fields is also a typedef name then the struct would
6724 not parse in C++, because the C++ lookup rules say that the
6725 typedef name would be looked up in the context of the struct, and
6726 would thus be the field rather than the typedef. */
6727 if (!VEC_empty (tree, struct_parse_info->typedefs_seen)
6728 && fieldlist != NULL_TREE)
6730 /* Use a pointer_set using the name of the typedef. We can use
6731 a pointer_set because identifiers are interned. */
6732 struct pointer_set_t *tset = pointer_set_create ();
6735 VEC_iterate (tree, struct_parse_info->typedefs_seen, ix, x);
6737 pointer_set_insert (tset, DECL_NAME (x));
6739 for (x = fieldlist; x != NULL_TREE; x = TREE_CHAIN (x))
6741 if (pointer_set_contains (tset, DECL_NAME (x)))
6743 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
6744 ("using %qD as both field and typedef name is "
6747 /* FIXME: It would be nice to report the location where
6748 the typedef name is used. */
6752 pointer_set_destroy (tset);
6755 /* For each field which has a binding and which was not defined in
6756 an enclosing struct, clear the in_struct field. */
6758 VEC_iterate (c_binding_ptr, struct_parse_info->fields, ix, b);
6763 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
6764 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
6765 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
6766 ATTRIBUTES are attributes to be applied to the structure.
6768 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
6769 the struct was started. */
6772 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
6773 struct c_struct_parse_info *enclosing_struct_parse_info)
6776 bool toplevel = file_scope == current_scope;
6777 int saw_named_field;
6779 /* If this type was previously laid out as a forward reference,
6780 make sure we lay it out again. */
6784 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
6788 for (x = fieldlist; x; x = TREE_CHAIN (x))
6790 if (DECL_NAME (x) != 0)
6793 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
6794 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
6800 if (TREE_CODE (t) == UNION_TYPE)
6803 pedwarn (loc, OPT_pedantic, "union has no named members");
6805 pedwarn (loc, OPT_pedantic, "union has no members");
6810 pedwarn (loc, OPT_pedantic, "struct has no named members");
6812 pedwarn (loc, OPT_pedantic, "struct has no members");
6817 /* Install struct as DECL_CONTEXT of each field decl.
6818 Also process specified field sizes, found in the DECL_INITIAL,
6819 storing 0 there after the type has been changed to precision equal
6820 to its width, rather than the precision of the specified standard
6821 type. (Correct layout requires the original type to have been preserved
6824 saw_named_field = 0;
6825 for (x = fieldlist; x; x = TREE_CHAIN (x))
6827 if (TREE_TYPE (x) == error_mark_node)
6830 DECL_CONTEXT (x) = t;
6832 /* If any field is const, the structure type is pseudo-const. */
6833 if (TREE_READONLY (x))
6834 C_TYPE_FIELDS_READONLY (t) = 1;
6837 /* A field that is pseudo-const makes the structure likewise. */
6838 tree t1 = TREE_TYPE (x);
6839 while (TREE_CODE (t1) == ARRAY_TYPE)
6840 t1 = TREE_TYPE (t1);
6841 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
6842 && C_TYPE_FIELDS_READONLY (t1))
6843 C_TYPE_FIELDS_READONLY (t) = 1;
6846 /* Any field that is volatile means variables of this type must be
6847 treated in some ways as volatile. */
6848 if (TREE_THIS_VOLATILE (x))
6849 C_TYPE_FIELDS_VOLATILE (t) = 1;
6851 /* Any field of nominal variable size implies structure is too. */
6852 if (C_DECL_VARIABLE_SIZE (x))
6853 C_TYPE_VARIABLE_SIZE (t) = 1;
6855 if (DECL_INITIAL (x))
6857 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
6858 DECL_SIZE (x) = bitsize_int (width);
6859 DECL_BIT_FIELD (x) = 1;
6860 SET_DECL_C_BIT_FIELD (x);
6864 && (DECL_BIT_FIELD (x)
6865 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
6866 DECL_PACKED (x) = 1;
6868 /* Detect flexible array member in an invalid context. */
6869 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
6870 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
6871 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
6872 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
6874 if (TREE_CODE (t) == UNION_TYPE)
6876 error_at (DECL_SOURCE_LOCATION (x),
6877 "flexible array member in union");
6878 TREE_TYPE (x) = error_mark_node;
6880 else if (TREE_CHAIN (x) != NULL_TREE)
6882 error_at (DECL_SOURCE_LOCATION (x),
6883 "flexible array member not at end of struct");
6884 TREE_TYPE (x) = error_mark_node;
6886 else if (!saw_named_field)
6888 error_at (DECL_SOURCE_LOCATION (x),
6889 "flexible array member in otherwise empty struct");
6890 TREE_TYPE (x) = error_mark_node;
6894 if (pedantic && TREE_CODE (t) == RECORD_TYPE
6895 && flexible_array_type_p (TREE_TYPE (x)))
6896 pedwarn (DECL_SOURCE_LOCATION (x), OPT_pedantic,
6897 "invalid use of structure with flexible array member");
6900 || TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
6901 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
6902 saw_named_field = 1;
6905 detect_field_duplicates (fieldlist);
6907 /* Now we have the nearly final fieldlist. Record it,
6908 then lay out the structure or union (including the fields). */
6910 TYPE_FIELDS (t) = fieldlist;
6914 /* Give bit-fields their proper types. */
6916 tree *fieldlistp = &fieldlist;
6918 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
6919 && TREE_TYPE (*fieldlistp) != error_mark_node)
6921 unsigned HOST_WIDE_INT width
6922 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
6923 tree type = TREE_TYPE (*fieldlistp);
6924 if (width != TYPE_PRECISION (type))
6926 TREE_TYPE (*fieldlistp)
6927 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
6928 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
6930 DECL_INITIAL (*fieldlistp) = 0;
6933 fieldlistp = &TREE_CHAIN (*fieldlistp);
6936 /* Now we have the truly final field list.
6937 Store it in this type and in the variants. */
6939 TYPE_FIELDS (t) = fieldlist;
6941 /* If there are lots of fields, sort so we can look through them fast.
6942 We arbitrarily consider 16 or more elts to be "a lot". */
6947 for (x = fieldlist; x; x = TREE_CHAIN (x))
6949 if (len > 15 || DECL_NAME (x) == NULL)
6957 struct lang_type *space;
6958 struct sorted_fields_type *space2;
6960 len += list_length (x);
6962 /* Use the same allocation policy here that make_node uses, to
6963 ensure that this lives as long as the rest of the struct decl.
6964 All decls in an inline function need to be saved. */
6966 space = GGC_CNEW (struct lang_type);
6967 space2 = GGC_NEWVAR (struct sorted_fields_type,
6968 sizeof (struct sorted_fields_type) + len * sizeof (tree));
6972 field_array = &space2->elts[0];
6973 for (x = fieldlist; x; x = TREE_CHAIN (x))
6975 field_array[len++] = x;
6977 /* If there is anonymous struct or union, break out of the loop. */
6978 if (DECL_NAME (x) == NULL)
6981 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
6984 TYPE_LANG_SPECIFIC (t) = space;
6985 TYPE_LANG_SPECIFIC (t)->s->len = len;
6986 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
6987 qsort (field_array, len, sizeof (tree), field_decl_cmp);
6992 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
6994 TYPE_FIELDS (x) = TYPE_FIELDS (t);
6995 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
6996 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
6997 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
6998 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
7001 /* If this was supposed to be a transparent union, but we can't
7002 make it one, warn and turn off the flag. */
7003 if (TREE_CODE (t) == UNION_TYPE
7004 && TYPE_TRANSPARENT_AGGR (t)
7005 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
7007 TYPE_TRANSPARENT_AGGR (t) = 0;
7008 warning_at (loc, 0, "union cannot be made transparent");
7011 /* If this structure or union completes the type of any previous
7012 variable declaration, lay it out and output its rtl. */
7013 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
7017 tree decl = TREE_VALUE (x);
7018 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
7019 layout_array_type (TREE_TYPE (decl));
7020 if (TREE_CODE (decl) != TYPE_DECL)
7022 layout_decl (decl, 0);
7023 if (c_dialect_objc ())
7024 objc_check_decl (decl);
7025 rest_of_decl_compilation (decl, toplevel, 0);
7030 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
7032 /* Update type location to the one of the definition, instead of e.g.
7033 a forward declaration. */
7034 if (TYPE_STUB_DECL (t))
7035 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
7037 /* Finish debugging output for this type. */
7038 rest_of_type_compilation (t, toplevel);
7040 /* If we're inside a function proper, i.e. not file-scope and not still
7041 parsing parameters, then arrange for the size of a variable sized type
7043 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
7044 add_stmt (build_stmt (loc,
7045 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
7047 if (warn_cxx_compat)
7048 warn_cxx_compat_finish_struct (fieldlist);
7050 VEC_free (tree, heap, struct_parse_info->struct_types);
7051 VEC_free (c_binding_ptr, heap, struct_parse_info->fields);
7052 VEC_free (tree, heap, struct_parse_info->typedefs_seen);
7053 XDELETE (struct_parse_info);
7055 struct_parse_info = enclosing_struct_parse_info;
7057 /* If this struct is defined inside a struct, add it to
7060 && struct_parse_info != NULL
7061 && !in_sizeof && !in_typeof && !in_alignof)
7062 VEC_safe_push (tree, heap, struct_parse_info->struct_types, t);
7067 /* Lay out the type T, and its element type, and so on. */
7070 layout_array_type (tree t)
7072 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
7073 layout_array_type (TREE_TYPE (t));
7077 /* Begin compiling the definition of an enumeration type.
7078 NAME is its name (or null if anonymous).
7079 LOC is the enum's location.
7080 Returns the type object, as yet incomplete.
7081 Also records info about it so that build_enumerator
7082 may be used to declare the individual values as they are read. */
7085 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
7087 tree enumtype = NULL_TREE;
7088 location_t enumloc = UNKNOWN_LOCATION;
7090 /* If this is the real definition for a previous forward reference,
7091 fill in the contents in the same object that used to be the
7092 forward reference. */
7094 if (name != NULL_TREE)
7095 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc);
7097 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
7099 enumtype = make_node (ENUMERAL_TYPE);
7100 pushtag (loc, name, enumtype);
7103 if (C_TYPE_BEING_DEFINED (enumtype))
7104 error_at (loc, "nested redefinition of %<enum %E%>", name);
7106 C_TYPE_BEING_DEFINED (enumtype) = 1;
7108 if (TYPE_VALUES (enumtype) != 0)
7110 /* This enum is a named one that has been declared already. */
7111 error_at (loc, "redeclaration of %<enum %E%>", name);
7112 if (enumloc != UNKNOWN_LOCATION)
7113 inform (enumloc, "originally defined here");
7115 /* Completely replace its old definition.
7116 The old enumerators remain defined, however. */
7117 TYPE_VALUES (enumtype) = 0;
7120 the_enum->enum_next_value = integer_zero_node;
7121 the_enum->enum_overflow = 0;
7123 if (flag_short_enums)
7124 TYPE_PACKED (enumtype) = 1;
7126 /* FIXME: This will issue a warning for a use of a type defined
7127 within sizeof in a statement expr. This is not terribly serious
7128 as C++ doesn't permit statement exprs within sizeof anyhow. */
7129 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7130 warning_at (loc, OPT_Wc___compat,
7131 "defining type in %qs expression is invalid in C++",
7134 : (in_typeof ? "typeof" : "alignof")));
7139 /* After processing and defining all the values of an enumeration type,
7140 install their decls in the enumeration type and finish it off.
7141 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7142 and ATTRIBUTES are the specified attributes.
7143 Returns ENUMTYPE. */
7146 finish_enum (tree enumtype, tree values, tree attributes)
7149 tree minnode = 0, maxnode = 0;
7150 int precision, unsign;
7151 bool toplevel = (file_scope == current_scope);
7152 struct lang_type *lt;
7154 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7156 /* Calculate the maximum value of any enumerator in this type. */
7158 if (values == error_mark_node)
7159 minnode = maxnode = integer_zero_node;
7162 minnode = maxnode = TREE_VALUE (values);
7163 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
7165 tree value = TREE_VALUE (pair);
7166 if (tree_int_cst_lt (maxnode, value))
7168 if (tree_int_cst_lt (value, minnode))
7173 /* Construct the final type of this enumeration. It is the same
7174 as one of the integral types - the narrowest one that fits, except
7175 that normally we only go as narrow as int - and signed iff any of
7176 the values are negative. */
7177 unsign = (tree_int_cst_sgn (minnode) >= 0);
7178 precision = MAX (tree_int_cst_min_precision (minnode, unsign),
7179 tree_int_cst_min_precision (maxnode, unsign));
7181 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
7183 tem = c_common_type_for_size (precision, unsign);
7186 warning (0, "enumeration values exceed range of largest integer");
7187 tem = long_long_integer_type_node;
7191 tem = unsign ? unsigned_type_node : integer_type_node;
7193 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
7194 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
7195 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
7196 TYPE_SIZE (enumtype) = 0;
7198 /* If the precision of the type was specific with an attribute and it
7199 was too small, give an error. Otherwise, use it. */
7200 if (TYPE_PRECISION (enumtype))
7202 if (precision > TYPE_PRECISION (enumtype))
7203 error ("specified mode too small for enumeral values");
7206 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
7208 layout_type (enumtype);
7210 if (values != error_mark_node)
7212 /* Change the type of the enumerators to be the enum type. We
7213 need to do this irrespective of the size of the enum, for
7214 proper type checking. Replace the DECL_INITIALs of the
7215 enumerators, and the value slots of the list, with copies
7216 that have the enum type; they cannot be modified in place
7217 because they may be shared (e.g. integer_zero_node) Finally,
7218 change the purpose slots to point to the names of the decls. */
7219 for (pair = values; pair; pair = TREE_CHAIN (pair))
7221 tree enu = TREE_PURPOSE (pair);
7222 tree ini = DECL_INITIAL (enu);
7224 TREE_TYPE (enu) = enumtype;
7226 /* The ISO C Standard mandates enumerators to have type int,
7227 even though the underlying type of an enum type is
7228 unspecified. However, GCC allows enumerators of any
7229 integer type as an extensions. build_enumerator()
7230 converts any enumerators that fit in an int to type int,
7231 to avoid promotions to unsigned types when comparing
7232 integers with enumerators that fit in the int range.
7233 When -pedantic is given, build_enumerator() would have
7234 already warned about those that don't fit. Here we
7235 convert the rest to the enumerator type. */
7236 if (TREE_TYPE (ini) != integer_type_node)
7237 ini = convert (enumtype, ini);
7239 DECL_INITIAL (enu) = ini;
7240 TREE_PURPOSE (pair) = DECL_NAME (enu);
7241 TREE_VALUE (pair) = ini;
7244 TYPE_VALUES (enumtype) = values;
7247 /* Record the min/max values so that we can warn about bit-field
7248 enumerations that are too small for the values. */
7249 lt = GGC_CNEW (struct lang_type);
7250 lt->enum_min = minnode;
7251 lt->enum_max = maxnode;
7252 TYPE_LANG_SPECIFIC (enumtype) = lt;
7254 /* Fix up all variant types of this enum type. */
7255 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
7257 if (tem == enumtype)
7259 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
7260 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
7261 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
7262 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
7263 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
7264 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
7265 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
7266 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
7267 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
7268 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
7269 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
7272 /* Finish debugging output for this type. */
7273 rest_of_type_compilation (enumtype, toplevel);
7275 /* If this enum is defined inside a struct, add it to
7278 && struct_parse_info != NULL
7279 && !in_sizeof && !in_typeof && !in_alignof)
7280 VEC_safe_push (tree, heap, struct_parse_info->struct_types, enumtype);
7285 /* Build and install a CONST_DECL for one value of the
7286 current enumeration type (one that was begun with start_enum).
7287 LOC is the location of the enumerator.
7288 Return a tree-list containing the CONST_DECL and its value.
7289 Assignment of sequential values by default is handled here. */
7292 build_enumerator (location_t loc,
7293 struct c_enum_contents *the_enum, tree name, tree value)
7297 /* Validate and default VALUE. */
7301 /* Don't issue more errors for error_mark_node (i.e. an
7302 undeclared identifier) - just ignore the value expression. */
7303 if (value == error_mark_node)
7305 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
7307 error_at (loc, "enumerator value for %qE is not an integer constant",
7313 if (TREE_CODE (value) != INTEGER_CST)
7315 value = c_fully_fold (value, false, NULL);
7316 if (TREE_CODE (value) == INTEGER_CST)
7317 pedwarn (loc, OPT_pedantic,
7318 "enumerator value for %qE is not an integer "
7319 "constant expression", name);
7321 if (TREE_CODE (value) != INTEGER_CST)
7323 error ("enumerator value for %qE is not an integer constant",
7329 value = default_conversion (value);
7330 constant_expression_warning (value);
7335 /* Default based on previous value. */
7336 /* It should no longer be possible to have NON_LVALUE_EXPR
7340 value = the_enum->enum_next_value;
7341 if (the_enum->enum_overflow)
7342 error_at (loc, "overflow in enumeration values");
7344 /* Even though the underlying type of an enum is unspecified, the
7345 type of enumeration constants is explicitly defined as int
7346 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7348 else if (!int_fits_type_p (value, integer_type_node))
7349 pedwarn (loc, OPT_pedantic,
7350 "ISO C restricts enumerator values to range of %<int%>");
7352 /* The ISO C Standard mandates enumerators to have type int, even
7353 though the underlying type of an enum type is unspecified.
7354 However, GCC allows enumerators of any integer type as an
7355 extensions. Here we convert any enumerators that fit in an int
7356 to type int, to avoid promotions to unsigned types when comparing
7357 integers with enumerators that fit in the int range. When
7358 -pedantic is given, we would have already warned about those that
7359 don't fit. We have to do this here rather than in finish_enum
7360 because this value may be used to define more enumerators. */
7361 if (int_fits_type_p (value, integer_type_node))
7362 value = convert (integer_type_node, value);
7364 /* Set basis for default for next value. */
7365 the_enum->enum_next_value
7367 (EXPR_HAS_LOCATION (value) ? EXPR_LOCATION (value) : input_location,
7368 PLUS_EXPR, value, integer_one_node, 0);
7369 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
7371 /* Now create a declaration for the enum value name. */
7373 type = TREE_TYPE (value);
7374 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
7375 TYPE_PRECISION (integer_type_node)),
7376 (TYPE_PRECISION (type)
7377 >= TYPE_PRECISION (integer_type_node)
7378 && TYPE_UNSIGNED (type)));
7380 decl = build_decl (loc, CONST_DECL, name, type);
7381 DECL_INITIAL (decl) = convert (type, value);
7384 return tree_cons (decl, value, NULL_TREE);
7388 /* Create the FUNCTION_DECL for a function definition.
7389 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7390 the declaration; they describe the function's name and the type it returns,
7391 but twisted together in a fashion that parallels the syntax of C.
7393 This function creates a binding context for the function body
7394 as well as setting up the FUNCTION_DECL in current_function_decl.
7396 Returns 1 on success. If the DECLARATOR is not suitable for a function
7397 (it defines a datum instead), we return 0, which tells
7398 yyparse to report a parse error. */
7401 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
7404 tree decl1, old_decl;
7405 tree restype, resdecl;
7408 current_function_returns_value = 0; /* Assume, until we see it does. */
7409 current_function_returns_null = 0;
7410 current_function_returns_abnormally = 0;
7411 warn_about_return_type = 0;
7412 c_switch_stack = NULL;
7414 /* Indicate no valid break/continue context by setting these variables
7415 to some non-null, non-label value. We'll notice and emit the proper
7416 error message in c_finish_bc_stmt. */
7417 c_break_label = c_cont_label = size_zero_node;
7419 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
7420 &attributes, NULL, NULL, DEPRECATED_NORMAL);
7422 /* If the declarator is not suitable for a function definition,
7423 cause a syntax error. */
7427 loc = DECL_SOURCE_LOCATION (decl1);
7429 decl_attributes (&decl1, attributes, 0);
7431 if (DECL_DECLARED_INLINE_P (decl1)
7432 && DECL_UNINLINABLE (decl1)
7433 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
7434 warning_at (loc, OPT_Wattributes,
7435 "inline function %qD given attribute noinline",
7438 /* Handle gnu_inline attribute. */
7439 if (declspecs->inline_p
7440 && !flag_gnu89_inline
7441 && TREE_CODE (decl1) == FUNCTION_DECL
7442 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
7443 || current_function_decl))
7445 if (declspecs->storage_class != csc_static)
7446 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
7449 announce_function (decl1);
7451 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
7453 error_at (loc, "return type is an incomplete type");
7454 /* Make it return void instead. */
7456 = build_function_type (void_type_node,
7457 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
7460 if (warn_about_return_type)
7461 pedwarn_c99 (loc, flag_isoc99 ? 0
7462 : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
7463 "return type defaults to %<int%>");
7465 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7466 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7467 DECL_INITIAL (decl1) = error_mark_node;
7469 /* A nested function is not global. */
7470 if (current_function_decl != 0)
7471 TREE_PUBLIC (decl1) = 0;
7473 /* If this definition isn't a prototype and we had a prototype declaration
7474 before, copy the arg type info from that prototype. */
7475 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
7476 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
7478 current_function_prototype_locus = UNKNOWN_LOCATION;
7479 current_function_prototype_built_in = false;
7480 current_function_prototype_arg_types = NULL_TREE;
7481 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
7483 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
7484 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7485 TREE_TYPE (TREE_TYPE (old_decl))))
7487 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
7489 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
7490 current_function_prototype_built_in
7491 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
7492 current_function_prototype_arg_types
7493 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
7495 if (TREE_PUBLIC (decl1))
7497 /* If there is an external prototype declaration of this
7498 function, record its location but do not copy information
7499 to this decl. This may be an invisible declaration
7500 (built-in or in a scope which has finished) or simply
7501 have more refined argument types than any declaration
7503 struct c_binding *b;
7504 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
7505 if (B_IN_SCOPE (b, external_scope))
7509 tree ext_decl, ext_type;
7511 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
7512 if (TREE_CODE (ext_type) == FUNCTION_TYPE
7513 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7514 TREE_TYPE (ext_type)))
7516 current_function_prototype_locus
7517 = DECL_SOURCE_LOCATION (ext_decl);
7518 current_function_prototype_built_in
7519 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
7520 current_function_prototype_arg_types
7521 = TYPE_ARG_TYPES (ext_type);
7527 /* Optionally warn of old-fashioned def with no previous prototype. */
7528 if (warn_strict_prototypes
7529 && old_decl != error_mark_node
7530 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
7531 && C_DECL_ISNT_PROTOTYPE (old_decl))
7532 warning_at (loc, OPT_Wstrict_prototypes,
7533 "function declaration isn%'t a prototype");
7534 /* Optionally warn of any global def with no previous prototype. */
7535 else if (warn_missing_prototypes
7536 && old_decl != error_mark_node
7537 && TREE_PUBLIC (decl1)
7538 && !MAIN_NAME_P (DECL_NAME (decl1))
7539 && C_DECL_ISNT_PROTOTYPE (old_decl))
7540 warning_at (loc, OPT_Wmissing_prototypes,
7541 "no previous prototype for %qD", decl1);
7542 /* Optionally warn of any def with no previous prototype
7543 if the function has already been used. */
7544 else if (warn_missing_prototypes
7546 && old_decl != error_mark_node
7547 && TREE_USED (old_decl)
7548 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
7549 warning_at (loc, OPT_Wmissing_prototypes,
7550 "%qD was used with no prototype before its definition", decl1);
7551 /* Optionally warn of any global def with no previous declaration. */
7552 else if (warn_missing_declarations
7553 && TREE_PUBLIC (decl1)
7555 && !MAIN_NAME_P (DECL_NAME (decl1)))
7556 warning_at (loc, OPT_Wmissing_declarations,
7557 "no previous declaration for %qD",
7559 /* Optionally warn of any def with no previous declaration
7560 if the function has already been used. */
7561 else if (warn_missing_declarations
7563 && old_decl != error_mark_node
7564 && TREE_USED (old_decl)
7565 && C_DECL_IMPLICIT (old_decl))
7566 warning_at (loc, OPT_Wmissing_declarations,
7567 "%qD was used with no declaration before its definition", decl1);
7569 /* This function exists in static storage.
7570 (This does not mean `static' in the C sense!) */
7571 TREE_STATIC (decl1) = 1;
7573 /* This is the earliest point at which we might know the assembler
7574 name of the function. Thus, if it's set before this, die horribly. */
7575 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
7577 /* If #pragma weak was used, mark the decl weak now. */
7578 if (current_scope == file_scope)
7579 maybe_apply_pragma_weak (decl1);
7581 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7582 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
7584 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
7585 != integer_type_node)
7586 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
7588 check_main_parameter_types (decl1);
7590 if (!TREE_PUBLIC (decl1))
7591 pedwarn (loc, OPT_Wmain,
7592 "%qD is normally a non-static function", decl1);
7595 /* Record the decl so that the function name is defined.
7596 If we already have a decl for this name, and it is a FUNCTION_DECL,
7597 use the old decl. */
7599 current_function_decl = pushdecl (decl1);
7602 declare_parm_level ();
7604 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
7605 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
7606 DECL_ARTIFICIAL (resdecl) = 1;
7607 DECL_IGNORED_P (resdecl) = 1;
7608 DECL_RESULT (current_function_decl) = resdecl;
7610 start_fname_decls ();
7615 /* Subroutine of store_parm_decls which handles new-style function
7616 definitions (prototype format). The parms already have decls, so we
7617 need only record them as in effect and complain if any redundant
7618 old-style parm decls were written. */
7620 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
7624 if (current_scope->bindings)
7626 error_at (DECL_SOURCE_LOCATION (fndecl),
7627 "old-style parameter declarations in prototyped "
7628 "function definition");
7630 /* Get rid of the old-style declarations. */
7634 /* Don't issue this warning for nested functions, and don't issue this
7635 warning if we got here because ARG_INFO_TYPES was error_mark_node
7636 (this happens when a function definition has just an ellipsis in
7637 its parameter list). */
7638 else if (!in_system_header && !current_function_scope
7639 && arg_info->types != error_mark_node)
7640 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
7641 "traditional C rejects ISO C style function definitions");
7643 /* Now make all the parameter declarations visible in the function body.
7644 We can bypass most of the grunt work of pushdecl. */
7645 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
7647 DECL_CONTEXT (decl) = current_function_decl;
7648 if (DECL_NAME (decl))
7650 bind (DECL_NAME (decl), decl, current_scope,
7651 /*invisible=*/false, /*nested=*/false,
7653 if (!TREE_USED (decl))
7654 warn_if_shadowing (decl);
7657 error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted");
7660 /* Record the parameter list in the function declaration. */
7661 DECL_ARGUMENTS (fndecl) = arg_info->parms;
7663 /* Now make all the ancillary declarations visible, likewise. */
7664 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
7666 DECL_CONTEXT (decl) = current_function_decl;
7667 if (DECL_NAME (decl))
7668 bind (DECL_NAME (decl), decl, current_scope,
7669 /*invisible=*/false,
7670 /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL),
7674 /* And all the tag declarations. */
7675 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
7676 if (TREE_PURPOSE (decl))
7677 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
7678 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
7681 /* Subroutine of store_parm_decls which handles old-style function
7682 definitions (separate parameter list and declarations). */
7685 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
7687 struct c_binding *b;
7688 tree parm, decl, last;
7689 tree parmids = arg_info->parms;
7690 struct pointer_set_t *seen_args = pointer_set_create ();
7692 if (!in_system_header)
7693 warning_at (DECL_SOURCE_LOCATION (fndecl),
7694 OPT_Wold_style_definition, "old-style function definition");
7696 /* Match each formal parameter name with its declaration. Save each
7697 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7698 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
7700 if (TREE_VALUE (parm) == 0)
7702 error_at (DECL_SOURCE_LOCATION (fndecl),
7703 "parameter name missing from parameter list");
7704 TREE_PURPOSE (parm) = 0;
7708 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
7709 if (b && B_IN_CURRENT_SCOPE (b))
7712 /* If we got something other than a PARM_DECL it is an error. */
7713 if (TREE_CODE (decl) != PARM_DECL)
7714 error_at (DECL_SOURCE_LOCATION (decl),
7715 "%qD declared as a non-parameter", decl);
7716 /* If the declaration is already marked, we have a duplicate
7717 name. Complain and ignore the duplicate. */
7718 else if (pointer_set_contains (seen_args, decl))
7720 error_at (DECL_SOURCE_LOCATION (decl),
7721 "multiple parameters named %qD", decl);
7722 TREE_PURPOSE (parm) = 0;
7725 /* If the declaration says "void", complain and turn it into
7727 else if (VOID_TYPE_P (TREE_TYPE (decl)))
7729 error_at (DECL_SOURCE_LOCATION (decl),
7730 "parameter %qD declared with void type", decl);
7731 TREE_TYPE (decl) = integer_type_node;
7732 DECL_ARG_TYPE (decl) = integer_type_node;
7733 layout_decl (decl, 0);
7735 warn_if_shadowing (decl);
7737 /* If no declaration found, default to int. */
7740 /* FIXME diagnostics: This should be the location of the argument,
7741 not the FNDECL. E.g., for an old-style declaration
7743 int f10(v) { blah; }
7745 We should use the location of the V, not the F10.
7746 Unfortunately, the V is an IDENTIFIER_NODE which has no
7747 location. In the future we need locations for c_arg_info
7750 See gcc.dg/Wshadow-3.c for an example of this problem. */
7751 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
7752 PARM_DECL, TREE_VALUE (parm), integer_type_node);
7753 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
7755 warn_if_shadowing (decl);
7758 pedwarn (DECL_SOURCE_LOCATION (decl),
7759 0, "type of %qD defaults to %<int%>", decl);
7761 warning_at (DECL_SOURCE_LOCATION (decl),
7762 OPT_Wmissing_parameter_type,
7763 "type of %qD defaults to %<int%>", decl);
7766 TREE_PURPOSE (parm) = decl;
7767 pointer_set_insert (seen_args, decl);
7770 /* Now examine the parms chain for incomplete declarations
7771 and declarations with no corresponding names. */
7773 for (b = current_scope->bindings; b; b = b->prev)
7776 if (TREE_CODE (parm) != PARM_DECL)
7779 if (TREE_TYPE (parm) != error_mark_node
7780 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
7782 error_at (DECL_SOURCE_LOCATION (parm),
7783 "parameter %qD has incomplete type", parm);
7784 TREE_TYPE (parm) = error_mark_node;
7787 if (!pointer_set_contains (seen_args, parm))
7789 error_at (DECL_SOURCE_LOCATION (parm),
7790 "declaration for parameter %qD but no such parameter",
7793 /* Pretend the parameter was not missing.
7794 This gets us to a standard state and minimizes
7795 further error messages. */
7796 parmids = chainon (parmids, tree_cons (parm, 0, 0));
7800 /* Chain the declarations together in the order of the list of
7801 names. Store that chain in the function decl, replacing the
7802 list of names. Update the current scope to match. */
7803 DECL_ARGUMENTS (fndecl) = 0;
7805 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
7806 if (TREE_PURPOSE (parm))
7808 if (parm && TREE_PURPOSE (parm))
7810 last = TREE_PURPOSE (parm);
7811 DECL_ARGUMENTS (fndecl) = last;
7813 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
7814 if (TREE_PURPOSE (parm))
7816 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7817 last = TREE_PURPOSE (parm);
7819 TREE_CHAIN (last) = 0;
7822 pointer_set_destroy (seen_args);
7824 /* If there was a previous prototype,
7825 set the DECL_ARG_TYPE of each argument according to
7826 the type previously specified, and report any mismatches. */
7828 if (current_function_prototype_arg_types)
7831 for (parm = DECL_ARGUMENTS (fndecl),
7832 type = current_function_prototype_arg_types;
7833 parm || (type && TREE_VALUE (type) != error_mark_node
7834 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
7835 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
7837 if (parm == 0 || type == 0
7838 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
7840 if (current_function_prototype_built_in)
7841 warning_at (DECL_SOURCE_LOCATION (fndecl),
7842 0, "number of arguments doesn%'t match "
7843 "built-in prototype");
7846 /* FIXME diagnostics: This should be the location of
7847 FNDECL, but there is bug when a prototype is
7848 declared inside function context, but defined
7849 outside of it (e.g., gcc.dg/pr15698-2.c). In
7850 which case FNDECL gets the location of the
7851 prototype, not the definition. */
7852 error_at (input_location,
7853 "number of arguments doesn%'t match prototype");
7855 error_at (current_function_prototype_locus,
7856 "prototype declaration");
7860 /* Type for passing arg must be consistent with that
7861 declared for the arg. ISO C says we take the unqualified
7862 type for parameters declared with qualified type. */
7863 if (TREE_TYPE (parm) != error_mark_node
7864 && TREE_TYPE (type) != error_mark_node
7865 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
7866 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
7868 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
7869 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
7871 /* Adjust argument to match prototype. E.g. a previous
7872 `int foo(float);' prototype causes
7873 `int foo(x) float x; {...}' to be treated like
7874 `int foo(float x) {...}'. This is particularly
7875 useful for argument types like uid_t. */
7876 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
7878 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
7879 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
7880 && TYPE_PRECISION (TREE_TYPE (parm))
7881 < TYPE_PRECISION (integer_type_node))
7882 DECL_ARG_TYPE (parm) = integer_type_node;
7884 /* ??? Is it possible to get here with a
7885 built-in prototype or will it always have
7886 been diagnosed as conflicting with an
7887 old-style definition and discarded? */
7888 if (current_function_prototype_built_in)
7889 warning_at (DECL_SOURCE_LOCATION (parm),
7890 OPT_pedantic, "promoted argument %qD "
7891 "doesn%'t match built-in prototype", parm);
7894 pedwarn (DECL_SOURCE_LOCATION (parm),
7895 OPT_pedantic, "promoted argument %qD "
7896 "doesn%'t match prototype", parm);
7897 pedwarn (current_function_prototype_locus, OPT_pedantic,
7898 "prototype declaration");
7903 if (current_function_prototype_built_in)
7904 warning_at (DECL_SOURCE_LOCATION (parm),
7905 0, "argument %qD doesn%'t match "
7906 "built-in prototype", parm);
7909 error_at (DECL_SOURCE_LOCATION (parm),
7910 "argument %qD doesn%'t match prototype", parm);
7911 error_at (current_function_prototype_locus,
7912 "prototype declaration");
7917 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
7920 /* Otherwise, create a prototype that would match. */
7924 tree actual = 0, last = 0, type;
7926 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
7928 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
7930 TREE_CHAIN (last) = type;
7935 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
7937 TREE_CHAIN (last) = type;
7941 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
7942 of the type of this function, but we need to avoid having this
7943 affect the types of other similarly-typed functions, so we must
7944 first force the generation of an identical (but separate) type
7945 node for the relevant function type. The new node we create
7946 will be a variant of the main variant of the original function
7949 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
7951 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
7955 /* Store parameter declarations passed in ARG_INFO into the current
7956 function declaration. */
7959 store_parm_decls_from (struct c_arg_info *arg_info)
7961 current_function_arg_info = arg_info;
7962 store_parm_decls ();
7965 /* Store the parameter declarations into the current function declaration.
7966 This is called after parsing the parameter declarations, before
7967 digesting the body of the function.
7969 For an old-style definition, construct a prototype out of the old-style
7970 parameter declarations and inject it into the function's type. */
7973 store_parm_decls (void)
7975 tree fndecl = current_function_decl;
7978 /* The argument information block for FNDECL. */
7979 struct c_arg_info *arg_info = current_function_arg_info;
7980 current_function_arg_info = 0;
7982 /* True if this definition is written with a prototype. Note:
7983 despite C99 6.7.5.3p14, we can *not* treat an empty argument
7984 list in a function definition as equivalent to (void) -- an
7985 empty argument list specifies the function has no parameters,
7986 but only (void) sets up a prototype for future calls. */
7987 proto = arg_info->types != 0;
7990 store_parm_decls_newstyle (fndecl, arg_info);
7992 store_parm_decls_oldstyle (fndecl, arg_info);
7994 /* The next call to push_scope will be a function body. */
7996 next_is_function_body = true;
7998 /* Write a record describing this function definition to the prototypes
7999 file (if requested). */
8001 gen_aux_info_record (fndecl, 1, 0, proto);
8003 /* Initialize the RTL code for the function. */
8004 allocate_struct_function (fndecl, false);
8006 /* Begin the statement tree for this function. */
8007 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
8009 /* ??? Insert the contents of the pending sizes list into the function
8010 to be evaluated. The only reason left to have this is
8011 void foo(int n, int array[n++])
8012 because we throw away the array type in favor of a pointer type, and
8013 thus won't naturally see the SAVE_EXPR containing the increment. All
8014 other pending sizes would be handled by gimplify_parameters. */
8016 VEC(tree,gc) *pending_sizes = get_pending_sizes ();
8020 for (i = 0; VEC_iterate (tree, pending_sizes, i, t); i++)
8024 /* Even though we're inside a function body, we still don't want to
8025 call expand_expr to calculate the size of a variable-sized array.
8026 We haven't necessarily assigned RTL to all variables yet, so it's
8027 not safe to try to expand expressions involving them. */
8028 cfun->dont_save_pending_sizes_p = 1;
8032 /* Finish up a function declaration and compile that function
8033 all the way to assembler language output. The free the storage
8034 for the function definition.
8036 This is called after parsing the body of the function definition. */
8039 finish_function (void)
8041 tree fndecl = current_function_decl;
8043 if (TREE_CODE (fndecl) == FUNCTION_DECL
8044 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
8046 tree args = DECL_ARGUMENTS (fndecl);
8047 for (; args; args = TREE_CHAIN (args))
8049 tree type = TREE_TYPE (args);
8050 if (INTEGRAL_TYPE_P (type)
8051 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
8052 DECL_ARG_TYPE (args) = integer_type_node;
8056 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
8057 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
8059 /* Must mark the RESULT_DECL as being in this function. */
8061 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
8062 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
8064 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
8065 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
8066 == integer_type_node && flag_isoc99)
8068 /* Hack. We don't want the middle-end to warn that this return
8069 is unreachable, so we mark its location as special. Using
8070 UNKNOWN_LOCATION has the problem that it gets clobbered in
8071 annotate_one_with_locus. A cleaner solution might be to
8072 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8074 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
8077 /* Tie off the statement tree for this function. */
8078 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
8080 finish_fname_decls ();
8082 /* Complain if there's just no return statement. */
8083 if (warn_return_type
8084 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
8085 && !current_function_returns_value && !current_function_returns_null
8086 /* Don't complain if we are no-return. */
8087 && !current_function_returns_abnormally
8088 /* Don't complain if we are declared noreturn. */
8089 && !TREE_THIS_VOLATILE (fndecl)
8090 /* Don't warn for main(). */
8091 && !MAIN_NAME_P (DECL_NAME (fndecl))
8092 /* Or if they didn't actually specify a return type. */
8093 && !C_FUNCTION_IMPLICIT_INT (fndecl)
8094 /* Normally, with -Wreturn-type, flow will complain, but we might
8095 optimize out static functions. */
8096 && !TREE_PUBLIC (fndecl))
8098 warning (OPT_Wreturn_type,
8099 "no return statement in function returning non-void");
8100 TREE_NO_WARNING (fndecl) = 1;
8103 /* Complain about parameters that are only set, but never otherwise used. */
8104 if (warn_unused_but_set_parameter)
8108 for (decl = DECL_ARGUMENTS (fndecl);
8110 decl = TREE_CHAIN (decl))
8111 if (TREE_USED (decl)
8112 && TREE_CODE (decl) == PARM_DECL
8113 && !DECL_READ_P (decl)
8115 && !DECL_ARTIFICIAL (decl)
8116 && !TREE_NO_WARNING (decl))
8117 warning_at (DECL_SOURCE_LOCATION (decl),
8118 OPT_Wunused_but_set_parameter,
8119 "parameter %qD set but not used", decl);
8122 /* Store the end of the function, so that we get good line number
8123 info for the epilogue. */
8124 cfun->function_end_locus = input_location;
8126 /* Finalize the ELF visibility for the function. */
8127 c_determine_visibility (fndecl);
8129 /* For GNU C extern inline functions disregard inline limits. */
8130 if (DECL_EXTERNAL (fndecl)
8131 && DECL_DECLARED_INLINE_P (fndecl))
8132 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
8134 /* Genericize before inlining. Delay genericizing nested functions
8135 until their parent function is genericized. Since finalizing
8136 requires GENERIC, delay that as well. */
8138 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
8139 && !undef_nested_function)
8141 if (!decl_function_context (fndecl))
8143 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
8144 c_genericize (fndecl);
8146 /* ??? Objc emits functions after finalizing the compilation unit.
8147 This should be cleaned up later and this conditional removed. */
8148 if (cgraph_global_info_ready)
8150 cgraph_add_new_function (fndecl, false);
8153 cgraph_finalize_function (fndecl, false);
8157 /* Register this function with cgraph just far enough to get it
8158 added to our parent's nested function list. Handy, since the
8159 C front end doesn't have such a list. */
8160 (void) cgraph_node (fndecl);
8164 if (!decl_function_context (fndecl))
8165 undef_nested_function = false;
8167 /* We're leaving the context of this function, so zap cfun.
8168 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8169 tree_rest_of_compilation. */
8171 current_function_decl = NULL;
8174 /* Check the declarations given in a for-loop for satisfying the C99
8175 constraints. If exactly one such decl is found, return it. LOC is
8176 the location of the opening parenthesis of the for loop. */
8179 check_for_loop_decls (location_t loc)
8181 struct c_binding *b;
8182 tree one_decl = NULL_TREE;
8187 static bool hint = true;
8188 /* If we get here, declarations have been used in a for loop without
8189 the C99 for loop scope. This doesn't make much sense, so don't
8191 error_at (loc, "%<for%> loop initial declarations "
8192 "are only allowed in C99 mode");
8196 "use option -std=c99 or -std=gnu99 to compile your code");
8201 /* C99 subclause 6.8.5 paragraph 3:
8203 [#3] The declaration part of a for statement shall only
8204 declare identifiers for objects having storage class auto or
8207 It isn't clear whether, in this sentence, "identifiers" binds to
8208 "shall only declare" or to "objects" - that is, whether all identifiers
8209 declared must be identifiers for objects, or whether the restriction
8210 only applies to those that are. (A question on this in comp.std.c
8211 in November 2000 received no answer.) We implement the strictest
8212 interpretation, to avoid creating an extension which later causes
8215 for (b = current_scope->bindings; b; b = b->prev)
8218 tree decl = b->decl;
8223 switch (TREE_CODE (decl))
8227 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
8228 if (TREE_STATIC (decl))
8230 "declaration of static variable %qD in %<for%> loop "
8231 "initial declaration", decl);
8232 else if (DECL_EXTERNAL (decl))
8234 "declaration of %<extern%> variable %qD in %<for%> loop "
8235 "initial declaration", decl);
8241 "%<struct %E%> declared in %<for%> loop initial "
8246 "%<union %E%> declared in %<for%> loop initial declaration",
8250 error_at (loc, "%<enum %E%> declared in %<for%> loop "
8251 "initial declaration", id);
8254 error_at (loc, "declaration of non-variable "
8255 "%qD in %<for%> loop initial declaration", decl);
8262 return n_decls == 1 ? one_decl : NULL_TREE;
8265 /* Save and reinitialize the variables
8266 used during compilation of a C function. */
8269 c_push_function_context (void)
8271 struct language_function *p;
8272 p = GGC_NEW (struct language_function);
8275 p->base.x_stmt_tree = c_stmt_tree;
8276 p->x_break_label = c_break_label;
8277 p->x_cont_label = c_cont_label;
8278 p->x_switch_stack = c_switch_stack;
8279 p->arg_info = current_function_arg_info;
8280 p->returns_value = current_function_returns_value;
8281 p->returns_null = current_function_returns_null;
8282 p->returns_abnormally = current_function_returns_abnormally;
8283 p->warn_about_return_type = warn_about_return_type;
8285 push_function_context ();
8288 /* Restore the variables used during compilation of a C function. */
8291 c_pop_function_context (void)
8293 struct language_function *p;
8295 pop_function_context ();
8297 cfun->language = NULL;
8299 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
8300 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
8302 /* Stop pointing to the local nodes about to be freed. */
8303 /* But DECL_INITIAL must remain nonzero so we know this
8304 was an actual function definition. */
8305 DECL_INITIAL (current_function_decl) = error_mark_node;
8306 DECL_ARGUMENTS (current_function_decl) = 0;
8309 c_stmt_tree = p->base.x_stmt_tree;
8310 c_break_label = p->x_break_label;
8311 c_cont_label = p->x_cont_label;
8312 c_switch_stack = p->x_switch_stack;
8313 current_function_arg_info = p->arg_info;
8314 current_function_returns_value = p->returns_value;
8315 current_function_returns_null = p->returns_null;
8316 current_function_returns_abnormally = p->returns_abnormally;
8317 warn_about_return_type = p->warn_about_return_type;
8320 /* The functions below are required for functionality of doing
8321 function at once processing in the C front end. Currently these
8322 functions are not called from anywhere in the C front end, but as
8323 these changes continue, that will change. */
8325 /* Returns the stmt_tree (if any) to which statements are currently
8326 being added. If there is no active statement-tree, NULL is
8330 current_stmt_tree (void)
8332 return &c_stmt_tree;
8335 /* Return the global value of T as a symbol. */
8338 identifier_global_value (tree t)
8340 struct c_binding *b;
8342 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
8343 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
8349 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8350 otherwise the name is found in ridpointers from RID_INDEX. */
8353 record_builtin_type (enum rid rid_index, const char *name, tree type)
8357 id = ridpointers[(int) rid_index];
8359 id = get_identifier (name);
8360 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
8362 if (debug_hooks->type_decl)
8363 debug_hooks->type_decl (decl, false);
8366 /* Build the void_list_node (void_type_node having been created). */
8368 build_void_list_node (void)
8370 tree t = build_tree_list (NULL_TREE, void_type_node);
8374 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8377 build_c_parm (struct c_declspecs *specs, tree attrs,
8378 struct c_declarator *declarator)
8380 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
8383 ret->declarator = declarator;
8387 /* Return a declarator with nested attributes. TARGET is the inner
8388 declarator to which these attributes apply. ATTRS are the
8391 struct c_declarator *
8392 build_attrs_declarator (tree attrs, struct c_declarator *target)
8394 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8395 ret->kind = cdk_attrs;
8396 ret->declarator = target;
8397 ret->u.attrs = attrs;
8401 /* Return a declarator for a function with arguments specified by ARGS
8402 and return type specified by TARGET. */
8404 struct c_declarator *
8405 build_function_declarator (struct c_arg_info *args,
8406 struct c_declarator *target)
8408 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8409 ret->kind = cdk_function;
8410 ret->declarator = target;
8411 ret->u.arg_info = args;
8415 /* Return a declarator for the identifier IDENT (which may be
8416 NULL_TREE for an abstract declarator). */
8418 struct c_declarator *
8419 build_id_declarator (tree ident)
8421 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8423 ret->declarator = 0;
8425 /* Default value - may get reset to a more precise location. */
8426 ret->id_loc = input_location;
8430 /* Return something to represent absolute declarators containing a *.
8431 TARGET is the absolute declarator that the * contains.
8432 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8433 to apply to the pointer type. */
8435 struct c_declarator *
8436 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
8437 struct c_declarator *target)
8441 struct c_declarator *itarget = target;
8442 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8443 if (type_quals_attrs)
8445 attrs = type_quals_attrs->attrs;
8446 quals = quals_from_declspecs (type_quals_attrs);
8447 if (attrs != NULL_TREE)
8448 itarget = build_attrs_declarator (attrs, target);
8450 ret->kind = cdk_pointer;
8451 ret->declarator = itarget;
8452 ret->u.pointer_quals = quals;
8456 /* Return a pointer to a structure for an empty list of declaration
8459 struct c_declspecs *
8460 build_null_declspecs (void)
8462 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
8467 ret->typespec_word = cts_none;
8468 ret->storage_class = csc_none;
8469 ret->expr_const_operands = true;
8470 ret->declspecs_seen_p = false;
8471 ret->type_seen_p = false;
8472 ret->non_sc_seen_p = false;
8473 ret->typedef_p = false;
8474 ret->tag_defined_p = false;
8475 ret->explicit_signed_p = false;
8476 ret->deprecated_p = false;
8477 ret->default_int_p = false;
8478 ret->long_p = false;
8479 ret->long_long_p = false;
8480 ret->short_p = false;
8481 ret->signed_p = false;
8482 ret->unsigned_p = false;
8483 ret->complex_p = false;
8484 ret->inline_p = false;
8485 ret->thread_p = false;
8486 ret->const_p = false;
8487 ret->volatile_p = false;
8488 ret->restrict_p = false;
8489 ret->saturating_p = false;
8490 ret->address_space = ADDR_SPACE_GENERIC;
8494 /* Add the address space ADDRSPACE to the declaration specifiers
8495 SPECS, returning SPECS. */
8497 struct c_declspecs *
8498 declspecs_add_addrspace (struct c_declspecs *specs, addr_space_t as)
8500 specs->non_sc_seen_p = true;
8501 specs->declspecs_seen_p = true;
8503 if (!ADDR_SPACE_GENERIC_P (specs->address_space)
8504 && specs->address_space != as)
8505 error ("incompatible address space qualifiers %qs and %qs",
8506 c_addr_space_name (as),
8507 c_addr_space_name (specs->address_space));
8509 specs->address_space = as;
8513 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8516 struct c_declspecs *
8517 declspecs_add_qual (struct c_declspecs *specs, tree qual)
8521 specs->non_sc_seen_p = true;
8522 specs->declspecs_seen_p = true;
8523 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
8524 && C_IS_RESERVED_WORD (qual));
8525 i = C_RID_CODE (qual);
8529 dupe = specs->const_p;
8530 specs->const_p = true;
8533 dupe = specs->volatile_p;
8534 specs->volatile_p = true;
8537 dupe = specs->restrict_p;
8538 specs->restrict_p = true;
8543 if (dupe && !flag_isoc99)
8544 pedwarn (input_location, OPT_pedantic, "duplicate %qE", qual);
8548 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8551 struct c_declspecs *
8552 declspecs_add_type (location_t loc, struct c_declspecs *specs,
8553 struct c_typespec spec)
8555 tree type = spec.spec;
8556 specs->non_sc_seen_p = true;
8557 specs->declspecs_seen_p = true;
8558 specs->type_seen_p = true;
8559 if (TREE_DEPRECATED (type))
8560 specs->deprecated_p = true;
8562 /* Handle type specifier keywords. */
8563 if (TREE_CODE (type) == IDENTIFIER_NODE
8564 && C_IS_RESERVED_WORD (type)
8565 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
8567 enum rid i = C_RID_CODE (type);
8570 error_at (loc, "two or more data types in declaration specifiers");
8573 if ((int) i <= (int) RID_LAST_MODIFIER)
8575 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8580 if (specs->long_long_p)
8582 error_at (loc, "%<long long long%> is too long for GCC");
8587 if (specs->typespec_word == cts_double)
8590 ("both %<long long%> and %<double%> in "
8591 "declaration specifiers"));
8594 pedwarn_c90 (loc, OPT_Wlong_long,
8595 "ISO C90 does not support %<long long%>");
8596 specs->long_long_p = 1;
8601 ("both %<long%> and %<short%> in "
8602 "declaration specifiers"));
8603 else if (specs->typespec_word == cts_void)
8605 ("both %<long%> and %<void%> in "
8606 "declaration specifiers"));
8607 else if (specs->typespec_word == cts_bool)
8609 ("both %<long%> and %<_Bool%> in "
8610 "declaration specifiers"));
8611 else if (specs->typespec_word == cts_char)
8613 ("both %<long%> and %<char%> in "
8614 "declaration specifiers"));
8615 else if (specs->typespec_word == cts_float)
8617 ("both %<long%> and %<float%> in "
8618 "declaration specifiers"));
8619 else if (specs->typespec_word == cts_dfloat32)
8621 ("both %<long%> and %<_Decimal32%> in "
8622 "declaration specifiers"));
8623 else if (specs->typespec_word == cts_dfloat64)
8625 ("both %<long%> and %<_Decimal64%> in "
8626 "declaration specifiers"));
8627 else if (specs->typespec_word == cts_dfloat128)
8629 ("both %<long%> and %<_Decimal128%> in "
8630 "declaration specifiers"));
8632 specs->long_p = true;
8635 dupe = specs->short_p;
8638 ("both %<long%> and %<short%> in "
8639 "declaration specifiers"));
8640 else if (specs->typespec_word == cts_void)
8642 ("both %<short%> and %<void%> in "
8643 "declaration specifiers"));
8644 else if (specs->typespec_word == cts_bool)
8646 ("both %<short%> and %<_Bool%> in "
8647 "declaration specifiers"));
8648 else if (specs->typespec_word == cts_char)
8650 ("both %<short%> and %<char%> in "
8651 "declaration specifiers"));
8652 else if (specs->typespec_word == cts_float)
8654 ("both %<short%> and %<float%> in "
8655 "declaration specifiers"));
8656 else if (specs->typespec_word == cts_double)
8658 ("both %<short%> and %<double%> in "
8659 "declaration specifiers"));
8660 else if (specs->typespec_word == cts_dfloat32)
8662 ("both %<short%> and %<_Decimal32%> in "
8663 "declaration specifiers"));
8664 else if (specs->typespec_word == cts_dfloat64)
8666 ("both %<short%> and %<_Decimal64%> in "
8667 "declaration specifiers"));
8668 else if (specs->typespec_word == cts_dfloat128)
8670 ("both %<short%> and %<_Decimal128%> in "
8671 "declaration specifiers"));
8673 specs->short_p = true;
8676 dupe = specs->signed_p;
8677 if (specs->unsigned_p)
8679 ("both %<signed%> and %<unsigned%> in "
8680 "declaration specifiers"));
8681 else if (specs->typespec_word == cts_void)
8683 ("both %<signed%> and %<void%> in "
8684 "declaration specifiers"));
8685 else if (specs->typespec_word == cts_bool)
8687 ("both %<signed%> and %<_Bool%> in "
8688 "declaration specifiers"));
8689 else if (specs->typespec_word == cts_float)
8691 ("both %<signed%> and %<float%> in "
8692 "declaration specifiers"));
8693 else if (specs->typespec_word == cts_double)
8695 ("both %<signed%> and %<double%> in "
8696 "declaration specifiers"));
8697 else if (specs->typespec_word == cts_dfloat32)
8699 ("both %<signed%> and %<_Decimal32%> in "
8700 "declaration specifiers"));
8701 else if (specs->typespec_word == cts_dfloat64)
8703 ("both %<signed%> and %<_Decimal64%> in "
8704 "declaration specifiers"));
8705 else if (specs->typespec_word == cts_dfloat128)
8707 ("both %<signed%> and %<_Decimal128%> in "
8708 "declaration specifiers"));
8710 specs->signed_p = true;
8713 dupe = specs->unsigned_p;
8714 if (specs->signed_p)
8716 ("both %<signed%> and %<unsigned%> in "
8717 "declaration specifiers"));
8718 else if (specs->typespec_word == cts_void)
8720 ("both %<unsigned%> and %<void%> in "
8721 "declaration specifiers"));
8722 else if (specs->typespec_word == cts_bool)
8724 ("both %<unsigned%> and %<_Bool%> in "
8725 "declaration specifiers"));
8726 else if (specs->typespec_word == cts_float)
8728 ("both %<unsigned%> and %<float%> in "
8729 "declaration specifiers"));
8730 else if (specs->typespec_word == cts_double)
8732 ("both %<unsigned%> and %<double%> in "
8733 "declaration specifiers"));
8734 else if (specs->typespec_word == cts_dfloat32)
8736 ("both %<unsigned%> and %<_Decimal32%> in "
8737 "declaration specifiers"));
8738 else if (specs->typespec_word == cts_dfloat64)
8740 ("both %<unsigned%> and %<_Decimal64%> in "
8741 "declaration specifiers"));
8742 else if (specs->typespec_word == cts_dfloat128)
8744 ("both %<unsigned%> and %<_Decimal128%> in "
8745 "declaration specifiers"));
8747 specs->unsigned_p = true;
8750 dupe = specs->complex_p;
8751 if (!flag_isoc99 && !in_system_header)
8752 pedwarn (loc, OPT_pedantic,
8753 "ISO C90 does not support complex types");
8754 if (specs->typespec_word == cts_void)
8756 ("both %<complex%> and %<void%> in "
8757 "declaration specifiers"));
8758 else if (specs->typespec_word == cts_bool)
8760 ("both %<complex%> and %<_Bool%> in "
8761 "declaration specifiers"));
8762 else if (specs->typespec_word == cts_dfloat32)
8764 ("both %<complex%> and %<_Decimal32%> in "
8765 "declaration specifiers"));
8766 else if (specs->typespec_word == cts_dfloat64)
8768 ("both %<complex%> and %<_Decimal64%> in "
8769 "declaration specifiers"));
8770 else if (specs->typespec_word == cts_dfloat128)
8772 ("both %<complex%> and %<_Decimal128%> in "
8773 "declaration specifiers"));
8774 else if (specs->typespec_word == cts_fract)
8776 ("both %<complex%> and %<_Fract%> in "
8777 "declaration specifiers"));
8778 else if (specs->typespec_word == cts_accum)
8780 ("both %<complex%> and %<_Accum%> in "
8781 "declaration specifiers"));
8782 else if (specs->saturating_p)
8784 ("both %<complex%> and %<_Sat%> in "
8785 "declaration specifiers"));
8787 specs->complex_p = true;
8790 dupe = specs->saturating_p;
8791 pedwarn (loc, OPT_pedantic,
8792 "ISO C does not support saturating types");
8793 if (specs->typespec_word == cts_void)
8795 ("both %<_Sat%> and %<void%> in "
8796 "declaration specifiers"));
8797 else if (specs->typespec_word == cts_bool)
8799 ("both %<_Sat%> and %<_Bool%> in "
8800 "declaration specifiers"));
8801 else if (specs->typespec_word == cts_char)
8803 ("both %<_Sat%> and %<char%> in "
8804 "declaration specifiers"));
8805 else if (specs->typespec_word == cts_int)
8807 ("both %<_Sat%> and %<int%> in "
8808 "declaration specifiers"));
8809 else if (specs->typespec_word == cts_float)
8811 ("both %<_Sat%> and %<float%> in "
8812 "declaration specifiers"));
8813 else if (specs->typespec_word == cts_double)
8815 ("both %<_Sat%> and %<double%> in "
8816 "declaration specifiers"));
8817 else if (specs->typespec_word == cts_dfloat32)
8819 ("both %<_Sat%> and %<_Decimal32%> in "
8820 "declaration specifiers"));
8821 else if (specs->typespec_word == cts_dfloat64)
8823 ("both %<_Sat%> and %<_Decimal64%> in "
8824 "declaration specifiers"));
8825 else if (specs->typespec_word == cts_dfloat128)
8827 ("both %<_Sat%> and %<_Decimal128%> in "
8828 "declaration specifiers"));
8829 else if (specs->complex_p)
8831 ("both %<_Sat%> and %<complex%> in "
8832 "declaration specifiers"));
8834 specs->saturating_p = true;
8841 error_at (loc, "duplicate %qE", type);
8847 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
8848 "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
8849 if (specs->typespec_word != cts_none)
8852 "two or more data types in declaration specifiers");
8860 ("both %<long%> and %<void%> in "
8861 "declaration specifiers"));
8862 else if (specs->short_p)
8864 ("both %<short%> and %<void%> in "
8865 "declaration specifiers"));
8866 else if (specs->signed_p)
8868 ("both %<signed%> and %<void%> in "
8869 "declaration specifiers"));
8870 else if (specs->unsigned_p)
8872 ("both %<unsigned%> and %<void%> in "
8873 "declaration specifiers"));
8874 else if (specs->complex_p)
8876 ("both %<complex%> and %<void%> in "
8877 "declaration specifiers"));
8878 else if (specs->saturating_p)
8880 ("both %<_Sat%> and %<void%> in "
8881 "declaration specifiers"));
8883 specs->typespec_word = cts_void;
8888 ("both %<long%> and %<_Bool%> in "
8889 "declaration specifiers"));
8890 else if (specs->short_p)
8892 ("both %<short%> and %<_Bool%> in "
8893 "declaration specifiers"));
8894 else if (specs->signed_p)
8896 ("both %<signed%> and %<_Bool%> in "
8897 "declaration specifiers"));
8898 else if (specs->unsigned_p)
8900 ("both %<unsigned%> and %<_Bool%> in "
8901 "declaration specifiers"));
8902 else if (specs->complex_p)
8904 ("both %<complex%> and %<_Bool%> in "
8905 "declaration specifiers"));
8906 else if (specs->saturating_p)
8908 ("both %<_Sat%> and %<_Bool%> in "
8909 "declaration specifiers"));
8911 specs->typespec_word = cts_bool;
8916 ("both %<long%> and %<char%> in "
8917 "declaration specifiers"));
8918 else if (specs->short_p)
8920 ("both %<short%> and %<char%> in "
8921 "declaration specifiers"));
8922 else if (specs->saturating_p)
8924 ("both %<_Sat%> and %<char%> in "
8925 "declaration specifiers"));
8927 specs->typespec_word = cts_char;
8930 if (specs->saturating_p)
8932 ("both %<_Sat%> and %<int%> in "
8933 "declaration specifiers"));
8935 specs->typespec_word = cts_int;
8940 ("both %<long%> and %<float%> in "
8941 "declaration specifiers"));
8942 else if (specs->short_p)
8944 ("both %<short%> and %<float%> in "
8945 "declaration specifiers"));
8946 else if (specs->signed_p)
8948 ("both %<signed%> and %<float%> in "
8949 "declaration specifiers"));
8950 else if (specs->unsigned_p)
8952 ("both %<unsigned%> and %<float%> in "
8953 "declaration specifiers"));
8954 else if (specs->saturating_p)
8956 ("both %<_Sat%> and %<float%> in "
8957 "declaration specifiers"));
8959 specs->typespec_word = cts_float;
8962 if (specs->long_long_p)
8964 ("both %<long long%> and %<double%> in "
8965 "declaration specifiers"));
8966 else if (specs->short_p)
8968 ("both %<short%> and %<double%> in "
8969 "declaration specifiers"));
8970 else if (specs->signed_p)
8972 ("both %<signed%> and %<double%> in "
8973 "declaration specifiers"));
8974 else if (specs->unsigned_p)
8976 ("both %<unsigned%> and %<double%> in "
8977 "declaration specifiers"));
8978 else if (specs->saturating_p)
8980 ("both %<_Sat%> and %<double%> in "
8981 "declaration specifiers"));
8983 specs->typespec_word = cts_double;
8990 if (i == RID_DFLOAT32)
8992 else if (i == RID_DFLOAT64)
8995 str = "_Decimal128";
8996 if (specs->long_long_p)
8998 ("both %<long long%> and %<%s%> in "
8999 "declaration specifiers"),
9003 ("both %<long%> and %<%s%> in "
9004 "declaration specifiers"),
9006 else if (specs->short_p)
9008 ("both %<short%> and %<%s%> in "
9009 "declaration specifiers"),
9011 else if (specs->signed_p)
9013 ("both %<signed%> and %<%s%> in "
9014 "declaration specifiers"),
9016 else if (specs->unsigned_p)
9018 ("both %<unsigned%> and %<%s%> in "
9019 "declaration specifiers"),
9021 else if (specs->complex_p)
9023 ("both %<complex%> and %<%s%> in "
9024 "declaration specifiers"),
9026 else if (specs->saturating_p)
9028 ("both %<_Sat%> and %<%s%> in "
9029 "declaration specifiers"),
9031 else if (i == RID_DFLOAT32)
9032 specs->typespec_word = cts_dfloat32;
9033 else if (i == RID_DFLOAT64)
9034 specs->typespec_word = cts_dfloat64;
9036 specs->typespec_word = cts_dfloat128;
9038 if (!targetm.decimal_float_supported_p ())
9040 ("decimal floating point not supported "
9041 "for this target"));
9042 pedwarn (loc, OPT_pedantic,
9043 "ISO C does not support decimal floating point");
9053 if (specs->complex_p)
9055 ("both %<complex%> and %<%s%> in "
9056 "declaration specifiers"),
9058 else if (i == RID_FRACT)
9059 specs->typespec_word = cts_fract;
9061 specs->typespec_word = cts_accum;
9063 if (!targetm.fixed_point_supported_p ())
9065 "fixed-point types not supported for this target");
9066 pedwarn (loc, OPT_pedantic,
9067 "ISO C does not support fixed-point types");
9070 /* ObjC reserved word "id", handled below. */
9076 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9077 form of ObjC type, cases such as "int" and "long" being handled
9078 above), a TYPE (struct, union, enum and typeof specifiers) or an
9079 ERROR_MARK. In none of these cases may there have previously
9080 been any type specifiers. */
9081 if (specs->type || specs->typespec_word != cts_none
9082 || specs->long_p || specs->short_p || specs->signed_p
9083 || specs->unsigned_p || specs->complex_p)
9084 error_at (loc, "two or more data types in declaration specifiers");
9085 else if (TREE_CODE (type) == TYPE_DECL)
9087 if (TREE_TYPE (type) == error_mark_node)
9088 ; /* Allow the type to default to int to avoid cascading errors. */
9091 specs->type = TREE_TYPE (type);
9092 specs->decl_attr = DECL_ATTRIBUTES (type);
9093 specs->typedef_p = true;
9094 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
9096 /* If this typedef name is defined in a struct, then a C++
9097 lookup would return a different value. */
9099 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
9100 warning_at (loc, OPT_Wc___compat,
9101 "C++ lookup of %qD would return a field, not a type",
9104 /* If we are parsing a struct, record that a struct field
9106 if (warn_cxx_compat && struct_parse_info != NULL)
9107 VEC_safe_push (tree, heap, struct_parse_info->typedefs_seen, type);
9110 else if (TREE_CODE (type) == IDENTIFIER_NODE)
9112 tree t = lookup_name (type);
9113 if (!t || TREE_CODE (t) != TYPE_DECL)
9114 error_at (loc, "%qE fails to be a typedef or built in type", type);
9115 else if (TREE_TYPE (t) == error_mark_node)
9118 specs->type = TREE_TYPE (t);
9120 else if (TREE_CODE (type) != ERROR_MARK)
9122 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
9123 specs->tag_defined_p = true;
9124 if (spec.kind == ctsk_typeof)
9126 specs->typedef_p = true;
9130 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
9131 specs->expr, spec.expr);
9133 specs->expr = spec.expr;
9134 specs->expr_const_operands &= spec.expr_const_operands;
9143 /* Add the storage class specifier or function specifier SCSPEC to the
9144 declaration specifiers SPECS, returning SPECS. */
9146 struct c_declspecs *
9147 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
9150 enum c_storage_class n = csc_none;
9152 specs->declspecs_seen_p = true;
9153 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
9154 && C_IS_RESERVED_WORD (scspec));
9155 i = C_RID_CODE (scspec);
9156 if (specs->non_sc_seen_p)
9157 warning (OPT_Wold_style_declaration,
9158 "%qE is not at beginning of declaration", scspec);
9162 /* C99 permits duplicate inline. Although of doubtful utility,
9163 it seems simplest to permit it in gnu89 mode as well, as
9164 there is also little utility in maintaining this as a
9165 difference between gnu89 and C99 inline. */
9167 specs->inline_p = true;
9170 dupe = specs->thread_p;
9171 if (specs->storage_class == csc_auto)
9172 error ("%<__thread%> used with %<auto%>");
9173 else if (specs->storage_class == csc_register)
9174 error ("%<__thread%> used with %<register%>");
9175 else if (specs->storage_class == csc_typedef)
9176 error ("%<__thread%> used with %<typedef%>");
9178 specs->thread_p = true;
9185 /* Diagnose "__thread extern". */
9186 if (specs->thread_p)
9187 error ("%<__thread%> before %<extern%>");
9194 /* Diagnose "__thread static". */
9195 if (specs->thread_p)
9196 error ("%<__thread%> before %<static%>");
9204 if (n != csc_none && n == specs->storage_class)
9207 error ("duplicate %qE", scspec);
9210 if (specs->storage_class != csc_none && n != specs->storage_class)
9212 error ("multiple storage classes in declaration specifiers");
9216 specs->storage_class = n;
9217 if (n != csc_extern && n != csc_static && specs->thread_p)
9219 error ("%<__thread%> used with %qE", scspec);
9220 specs->thread_p = false;
9227 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9230 struct c_declspecs *
9231 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
9233 specs->attrs = chainon (attrs, specs->attrs);
9234 specs->declspecs_seen_p = true;
9238 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9239 specifiers with any other type specifier to determine the resulting
9240 type. This is where ISO C checks on complex types are made, since
9241 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9244 struct c_declspecs *
9245 finish_declspecs (struct c_declspecs *specs)
9247 /* If a type was specified as a whole, we have no modifiers and are
9249 if (specs->type != NULL_TREE)
9251 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
9252 && !specs->signed_p && !specs->unsigned_p
9253 && !specs->complex_p);
9257 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9258 has been specified, treat it as "int" unless "_Complex" is
9259 present and there are no other specifiers. If we just have
9260 "_Complex", it is equivalent to "_Complex double", but e.g.
9261 "_Complex short" is equivalent to "_Complex short int". */
9262 if (specs->typespec_word == cts_none)
9264 if (specs->saturating_p)
9266 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9267 if (!targetm.fixed_point_supported_p ())
9268 error ("fixed-point types not supported for this target");
9269 specs->typespec_word = cts_fract;
9271 else if (specs->long_p || specs->short_p
9272 || specs->signed_p || specs->unsigned_p)
9274 specs->typespec_word = cts_int;
9276 else if (specs->complex_p)
9278 specs->typespec_word = cts_double;
9279 pedwarn (input_location, OPT_pedantic,
9280 "ISO C does not support plain %<complex%> meaning "
9281 "%<double complex%>");
9285 specs->typespec_word = cts_int;
9286 specs->default_int_p = true;
9287 /* We don't diagnose this here because grokdeclarator will
9288 give more specific diagnostics according to whether it is
9289 a function definition. */
9293 /* If "signed" was specified, record this to distinguish "int" and
9294 "signed int" in the case of a bit-field with
9295 -funsigned-bitfields. */
9296 specs->explicit_signed_p = specs->signed_p;
9298 /* Now compute the actual type. */
9299 switch (specs->typespec_word)
9302 gcc_assert (!specs->long_p && !specs->short_p
9303 && !specs->signed_p && !specs->unsigned_p
9304 && !specs->complex_p);
9305 specs->type = void_type_node;
9308 gcc_assert (!specs->long_p && !specs->short_p
9309 && !specs->signed_p && !specs->unsigned_p
9310 && !specs->complex_p);
9311 specs->type = boolean_type_node;
9314 gcc_assert (!specs->long_p && !specs->short_p);
9315 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9316 if (specs->signed_p)
9317 specs->type = signed_char_type_node;
9318 else if (specs->unsigned_p)
9319 specs->type = unsigned_char_type_node;
9321 specs->type = char_type_node;
9322 if (specs->complex_p)
9324 pedwarn (input_location, OPT_pedantic,
9325 "ISO C does not support complex integer types");
9326 specs->type = build_complex_type (specs->type);
9330 gcc_assert (!(specs->long_p && specs->short_p));
9331 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9332 if (specs->long_long_p)
9333 specs->type = (specs->unsigned_p
9334 ? long_long_unsigned_type_node
9335 : long_long_integer_type_node);
9336 else if (specs->long_p)
9337 specs->type = (specs->unsigned_p
9338 ? long_unsigned_type_node
9339 : long_integer_type_node);
9340 else if (specs->short_p)
9341 specs->type = (specs->unsigned_p
9342 ? short_unsigned_type_node
9343 : short_integer_type_node);
9345 specs->type = (specs->unsigned_p
9346 ? unsigned_type_node
9347 : integer_type_node);
9348 if (specs->complex_p)
9350 pedwarn (input_location, OPT_pedantic,
9351 "ISO C does not support complex integer types");
9352 specs->type = build_complex_type (specs->type);
9356 gcc_assert (!specs->long_p && !specs->short_p
9357 && !specs->signed_p && !specs->unsigned_p);
9358 specs->type = (specs->complex_p
9359 ? complex_float_type_node
9363 gcc_assert (!specs->long_long_p && !specs->short_p
9364 && !specs->signed_p && !specs->unsigned_p);
9367 specs->type = (specs->complex_p
9368 ? complex_long_double_type_node
9369 : long_double_type_node);
9373 specs->type = (specs->complex_p
9374 ? complex_double_type_node
9375 : double_type_node);
9381 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
9382 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
9383 if (specs->typespec_word == cts_dfloat32)
9384 specs->type = dfloat32_type_node;
9385 else if (specs->typespec_word == cts_dfloat64)
9386 specs->type = dfloat64_type_node;
9388 specs->type = dfloat128_type_node;
9391 gcc_assert (!specs->complex_p);
9392 if (!targetm.fixed_point_supported_p ())
9393 specs->type = integer_type_node;
9394 else if (specs->saturating_p)
9396 if (specs->long_long_p)
9397 specs->type = specs->unsigned_p
9398 ? sat_unsigned_long_long_fract_type_node
9399 : sat_long_long_fract_type_node;
9400 else if (specs->long_p)
9401 specs->type = specs->unsigned_p
9402 ? sat_unsigned_long_fract_type_node
9403 : sat_long_fract_type_node;
9404 else if (specs->short_p)
9405 specs->type = specs->unsigned_p
9406 ? sat_unsigned_short_fract_type_node
9407 : sat_short_fract_type_node;
9409 specs->type = specs->unsigned_p
9410 ? sat_unsigned_fract_type_node
9411 : sat_fract_type_node;
9415 if (specs->long_long_p)
9416 specs->type = specs->unsigned_p
9417 ? unsigned_long_long_fract_type_node
9418 : long_long_fract_type_node;
9419 else if (specs->long_p)
9420 specs->type = specs->unsigned_p
9421 ? unsigned_long_fract_type_node
9422 : long_fract_type_node;
9423 else if (specs->short_p)
9424 specs->type = specs->unsigned_p
9425 ? unsigned_short_fract_type_node
9426 : short_fract_type_node;
9428 specs->type = specs->unsigned_p
9429 ? unsigned_fract_type_node
9434 gcc_assert (!specs->complex_p);
9435 if (!targetm.fixed_point_supported_p ())
9436 specs->type = integer_type_node;
9437 else if (specs->saturating_p)
9439 if (specs->long_long_p)
9440 specs->type = specs->unsigned_p
9441 ? sat_unsigned_long_long_accum_type_node
9442 : sat_long_long_accum_type_node;
9443 else if (specs->long_p)
9444 specs->type = specs->unsigned_p
9445 ? sat_unsigned_long_accum_type_node
9446 : sat_long_accum_type_node;
9447 else if (specs->short_p)
9448 specs->type = specs->unsigned_p
9449 ? sat_unsigned_short_accum_type_node
9450 : sat_short_accum_type_node;
9452 specs->type = specs->unsigned_p
9453 ? sat_unsigned_accum_type_node
9454 : sat_accum_type_node;
9458 if (specs->long_long_p)
9459 specs->type = specs->unsigned_p
9460 ? unsigned_long_long_accum_type_node
9461 : long_long_accum_type_node;
9462 else if (specs->long_p)
9463 specs->type = specs->unsigned_p
9464 ? unsigned_long_accum_type_node
9465 : long_accum_type_node;
9466 else if (specs->short_p)
9467 specs->type = specs->unsigned_p
9468 ? unsigned_short_accum_type_node
9469 : short_accum_type_node;
9471 specs->type = specs->unsigned_p
9472 ? unsigned_accum_type_node
9483 /* A subroutine of c_write_global_declarations. Perform final processing
9484 on one file scope's declarations (or the external scope's declarations),
9488 c_write_global_declarations_1 (tree globals)
9493 /* Process the decls in the order they were written. */
9494 for (decl = globals; decl; decl = TREE_CHAIN (decl))
9496 /* Check for used but undefined static functions using the C
9497 standard's definition of "used", and set TREE_NO_WARNING so
9498 that check_global_declarations doesn't repeat the check. */
9499 if (TREE_CODE (decl) == FUNCTION_DECL
9500 && DECL_INITIAL (decl) == 0
9501 && DECL_EXTERNAL (decl)
9502 && !TREE_PUBLIC (decl)
9503 && C_DECL_USED (decl))
9505 pedwarn (input_location, 0, "%q+F used but never defined", decl);
9506 TREE_NO_WARNING (decl) = 1;
9509 wrapup_global_declaration_1 (decl);
9515 for (decl = globals; decl; decl = TREE_CHAIN (decl))
9516 reconsider |= wrapup_global_declaration_2 (decl);
9520 for (decl = globals; decl; decl = TREE_CHAIN (decl))
9521 check_global_declaration_1 (decl);
9524 /* A subroutine of c_write_global_declarations Emit debug information for each
9525 of the declarations in GLOBALS. */
9528 c_write_global_declarations_2 (tree globals)
9532 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
9533 debug_hooks->global_decl (decl);
9536 /* Preserve the external declarations scope across a garbage collect. */
9537 static GTY(()) tree ext_block;
9540 c_write_global_declarations (void)
9544 /* We don't want to do this if generating a PCH. */
9548 /* Don't waste time on further processing if -fsyntax-only.
9549 Continue for warning and errors issued during lowering though. */
9550 if (flag_syntax_only)
9553 /* Close the external scope. */
9554 ext_block = pop_scope ();
9556 gcc_assert (!current_scope);
9560 tree tmp = BLOCK_VARS (ext_block);
9562 FILE * stream = dump_begin (TDI_tu, &flags);
9565 dump_node (tmp, flags & ~TDF_SLIM, stream);
9566 dump_end (TDI_tu, stream);
9570 /* Process all file scopes in this compilation, and the external_scope,
9571 through wrapup_global_declarations and check_global_declarations. */
9572 for (t = all_translation_units; t; t = TREE_CHAIN (t))
9573 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
9574 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
9576 /* We're done parsing; proceed to optimize and emit assembly.
9577 FIXME: shouldn't be the front end's responsibility to call this. */
9578 cgraph_finalize_compilation_unit ();
9580 /* After cgraph has had a chance to emit everything that's going to
9581 be emitted, output debug information for globals. */
9582 if (errorcount == 0 && sorrycount == 0)
9584 timevar_push (TV_SYMOUT);
9585 for (t = all_translation_units; t; t = TREE_CHAIN (t))
9586 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
9587 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
9588 timevar_pop (TV_SYMOUT);
9594 #include "gt-c-decl.h"