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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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"
53 #include "langhooks.h"
54 #include "tree-mudflap.h"
55 #include "tree-gimple.h"
56 #include "diagnostic.h"
57 #include "tree-dump.h"
62 #include "langhooks-def.h"
63 #include "pointer-set.h"
65 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
67 { NORMAL, /* Ordinary declaration */
68 FUNCDEF, /* Function definition */
69 PARM, /* Declaration of parm before function body */
70 FIELD, /* Declaration inside struct or union */
71 TYPENAME}; /* Typename (inside cast or sizeof) */
74 /* Nonzero if we have seen an invalid cross reference
75 to a struct, union, or enum, but not yet printed the message. */
76 tree pending_invalid_xref;
78 /* File and line to appear in the eventual error message. */
79 location_t pending_invalid_xref_location;
81 /* True means we've initialized exception handling. */
82 bool c_eh_initialized_p;
84 /* While defining an enum type, this is 1 plus the last enumerator
85 constant value. Note that will do not have to save this or `enum_overflow'
86 around nested function definition since such a definition could only
87 occur in an enum value expression and we don't use these variables in
90 static tree enum_next_value;
92 /* Nonzero means that there was overflow computing enum_next_value. */
94 static int enum_overflow;
96 /* The file and line that the prototype came from if this is an
97 old-style definition; used for diagnostics in
98 store_parm_decls_oldstyle. */
100 static location_t current_function_prototype_locus;
102 /* Whether this prototype was built-in. */
104 static bool current_function_prototype_built_in;
106 /* The argument type information of this prototype. */
108 static tree current_function_prototype_arg_types;
110 /* The argument information structure for the function currently being
113 static struct c_arg_info *current_function_arg_info;
115 /* The obstack on which parser and related data structures, which are
116 not live beyond their top-level declaration or definition, are
118 struct obstack parser_obstack;
120 /* The current statement tree. */
122 static GTY(()) struct stmt_tree_s c_stmt_tree;
124 /* State saving variables. */
128 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
129 included in this invocation. Note that the current translation
130 unit is not included in this list. */
132 static GTY(()) tree all_translation_units;
134 /* A list of decls to be made automatically visible in each file scope. */
135 static GTY(()) tree visible_builtins;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a return statement that specifies a return value is seen. */
140 int current_function_returns_value;
142 /* Set to 0 at beginning of a function definition, set to 1 if
143 a return statement with no argument is seen. */
145 int current_function_returns_null;
147 /* Set to 0 at beginning of a function definition, set to 1 if
148 a call to a noreturn function is seen. */
150 int current_function_returns_abnormally;
152 /* Set to nonzero by `grokdeclarator' for a function
153 whose return type is defaulted, if warnings for this are desired. */
155 static int warn_about_return_type;
157 /* Nonzero when starting a function declared `extern inline'. */
159 static int current_extern_inline;
161 /* Nonzero when the current toplevel function contains a declaration
162 of a nested function which is never defined. */
164 static bool undef_nested_function;
166 /* True means global_bindings_p should return false even if the scope stack
167 says we are in file scope. */
168 bool c_override_global_bindings_to_false;
171 /* Each c_binding structure describes one binding of an identifier to
172 a decl. All the decls in a scope - irrespective of namespace - are
173 chained together by the ->prev field, which (as the name implies)
174 runs in reverse order. All the decls in a given namespace bound to
175 a given identifier are chained by the ->shadowed field, which runs
176 from inner to outer scopes.
178 The ->decl field usually points to a DECL node, but there are two
179 exceptions. In the namespace of type tags, the bound entity is a
180 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
181 identifier is encountered, it is bound to error_mark_node to
182 suppress further errors about that identifier in the current
185 The ->type field stores the type of the declaration in this scope;
186 if NULL, the type is the type of the ->decl field. This is only of
187 relevance for objects with external or internal linkage which may
188 be redeclared in inner scopes, forming composite types that only
189 persist for the duration of those scopes. In the external scope,
190 this stores the composite of all the types declared for this
191 object, visible or not. The ->inner_comp field (used only at file
192 scope) stores whether an incomplete array type at file scope was
193 completed at an inner scope to an array size other than 1.
195 The depth field is copied from the scope structure that holds this
196 decl. It is used to preserve the proper ordering of the ->shadowed
197 field (see bind()) and also for a handful of special-case checks.
198 Finally, the invisible bit is true for a decl which should be
199 ignored for purposes of normal name lookup, and the nested bit is
200 true for a decl that's been bound a second time in an inner scope;
201 in all such cases, the binding in the outer scope will have its
202 invisible bit true. */
204 struct c_binding GTY((chain_next ("%h.prev")))
206 tree decl; /* the decl bound */
207 tree type; /* the type in this scope */
208 tree id; /* the identifier it's bound to */
209 struct c_binding *prev; /* the previous decl in this scope */
210 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
211 unsigned int depth : 28; /* depth of this scope */
212 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
213 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
214 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
217 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
218 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
219 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
220 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
222 #define I_SYMBOL_BINDING(node) \
223 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
224 #define I_SYMBOL_DECL(node) \
225 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
227 #define I_TAG_BINDING(node) \
228 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
229 #define I_TAG_DECL(node) \
230 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
232 #define I_LABEL_BINDING(node) \
233 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
234 #define I_LABEL_DECL(node) \
235 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
237 /* Each C symbol points to three linked lists of c_binding structures.
238 These describe the values of the identifier in the three different
239 namespaces defined by the language. */
241 struct lang_identifier GTY(())
243 struct c_common_identifier common_id;
244 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
245 struct c_binding *tag_binding; /* struct/union/enum tags */
246 struct c_binding *label_binding; /* labels */
249 /* Validate c-lang.c's assumptions. */
250 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
251 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
253 /* The resulting tree type. */
256 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
257 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)")))
259 union tree_node GTY ((tag ("0"),
260 desc ("tree_node_structure (&%h)")))
262 struct lang_identifier GTY ((tag ("1"))) identifier;
265 /* Each c_scope structure describes the complete contents of one
266 scope. Four scopes are distinguished specially: the innermost or
267 current scope, the innermost function scope, the file scope (always
268 the second to outermost) and the outermost or external scope.
270 Most declarations are recorded in the current scope.
272 All normal label declarations are recorded in the innermost
273 function scope, as are bindings of undeclared identifiers to
274 error_mark_node. (GCC permits nested functions as an extension,
275 hence the 'innermost' qualifier.) Explicitly declared labels
276 (using the __label__ extension) appear in the current scope.
278 Being in the file scope (current_scope == file_scope) causes
279 special behavior in several places below. Also, under some
280 conditions the Objective-C front end records declarations in the
281 file scope even though that isn't the current scope.
283 All declarations with external linkage are recorded in the external
284 scope, even if they aren't visible there; this models the fact that
285 such declarations are visible to the entire program, and (with a
286 bit of cleverness, see pushdecl) allows diagnosis of some violations
287 of C99 6.2.2p7 and 6.2.7p2:
289 If, within the same translation unit, the same identifier appears
290 with both internal and external linkage, the behavior is
293 All declarations that refer to the same object or function shall
294 have compatible type; otherwise, the behavior is undefined.
296 Initially only the built-in declarations, which describe compiler
297 intrinsic functions plus a subset of the standard library, are in
300 The order of the blocks list matters, and it is frequently appended
301 to. To avoid having to walk all the way to the end of the list on
302 each insertion, or reverse the list later, we maintain a pointer to
303 the last list entry. (FIXME: It should be feasible to use a reversed
306 The bindings list is strictly in reverse order of declarations;
307 pop_scope relies on this. */
310 struct c_scope GTY((chain_next ("%h.outer")))
312 /* The scope containing this one. */
313 struct c_scope *outer;
315 /* The next outermost function scope. */
316 struct c_scope *outer_function;
318 /* All bindings in this scope. */
319 struct c_binding *bindings;
321 /* For each scope (except the global one), a chain of BLOCK nodes
322 for all the scopes that were entered and exited one level down. */
326 /* The depth of this scope. Used to keep the ->shadowed chain of
327 bindings sorted innermost to outermost. */
328 unsigned int depth : 28;
330 /* True if we are currently filling this scope with parameter
332 BOOL_BITFIELD parm_flag : 1;
334 /* True if we already complained about forward parameter decls
335 in this scope. This prevents double warnings on
336 foo (int a; int b; ...) */
337 BOOL_BITFIELD warned_forward_parm_decls : 1;
339 /* True if this is the outermost block scope of a function body.
340 This scope contains the parameters, the local variables declared
341 in the outermost block, and all the labels (except those in
342 nested functions, or declared at block scope with __label__). */
343 BOOL_BITFIELD function_body : 1;
345 /* True means make a BLOCK for this scope no matter what. */
346 BOOL_BITFIELD keep : 1;
349 /* The scope currently in effect. */
351 static GTY(()) struct c_scope *current_scope;
353 /* The innermost function scope. Ordinary (not explicitly declared)
354 labels, bindings to error_mark_node, and the lazily-created
355 bindings of __func__ and its friends get this scope. */
357 static GTY(()) struct c_scope *current_function_scope;
359 /* The C file scope. This is reset for each input translation unit. */
361 static GTY(()) struct c_scope *file_scope;
363 /* The outermost scope. This is used for all declarations with
364 external linkage, and only these, hence the name. */
366 static GTY(()) struct c_scope *external_scope;
368 /* A chain of c_scope structures awaiting reuse. */
370 static GTY((deletable)) struct c_scope *scope_freelist;
372 /* A chain of c_binding structures awaiting reuse. */
374 static GTY((deletable)) struct c_binding *binding_freelist;
376 /* Append VAR to LIST in scope SCOPE. */
377 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
378 struct c_scope *s_ = (scope); \
380 if (s_->list##_last) \
381 TREE_CHAIN (s_->list##_last) = d_; \
384 s_->list##_last = d_; \
387 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
388 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
389 struct c_scope *t_ = (tscope); \
390 struct c_scope *f_ = (fscope); \
392 TREE_CHAIN (t_->to##_last) = f_->from; \
395 t_->to##_last = f_->from##_last; \
398 /* True means unconditionally make a BLOCK for the next scope pushed. */
400 static bool keep_next_level_flag;
402 /* True means the next call to push_scope will be the outermost scope
403 of a function body, so do not push a new scope, merely cease
404 expecting parameter decls. */
406 static bool next_is_function_body;
408 /* Functions called automatically at the beginning and end of execution. */
410 static GTY(()) tree static_ctors;
411 static GTY(()) tree static_dtors;
413 /* Forward declarations. */
414 static tree lookup_name_in_scope (tree, struct c_scope *);
415 static tree c_make_fname_decl (tree, int);
416 static tree grokdeclarator (const struct c_declarator *,
417 struct c_declspecs *,
418 enum decl_context, bool, tree *);
419 static tree grokparms (struct c_arg_info *, bool);
420 static void layout_array_type (tree);
422 /* T is a statement. Add it to the statement-tree. This is the
423 C/ObjC version--C++ has a slightly different version of this
429 enum tree_code code = TREE_CODE (t);
431 if (EXPR_P (t) && code != LABEL_EXPR)
433 if (!EXPR_HAS_LOCATION (t))
434 SET_EXPR_LOCATION (t, input_location);
437 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
438 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
440 /* Add T to the statement-tree. Non-side-effect statements need to be
441 recorded during statement expressions. */
442 append_to_statement_list_force (t, &cur_stmt_list);
447 /* States indicating how grokdeclarator() should handle declspecs marked
448 with __attribute__((deprecated)). An object declared as
449 __attribute__((deprecated)) suppresses warnings of uses of other
452 enum deprecated_states {
457 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
460 c_print_identifier (FILE *file, tree node, int indent)
462 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
463 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
464 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
465 if (C_IS_RESERVED_WORD (node))
467 tree rid = ridpointers[C_RID_CODE (node)];
468 indent_to (file, indent + 4);
469 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
470 (void *) rid, IDENTIFIER_POINTER (rid));
474 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
475 which may be any of several kinds of DECL or TYPE or error_mark_node,
476 in the scope SCOPE. */
478 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
480 struct c_binding *b, **here;
482 if (binding_freelist)
484 b = binding_freelist;
485 binding_freelist = b->prev;
488 b = GGC_NEW (struct c_binding);
493 b->depth = scope->depth;
494 b->invisible = invisible;
500 b->prev = scope->bindings;
506 switch (TREE_CODE (decl))
508 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
511 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
517 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
523 /* Locate the appropriate place in the chain of shadowed decls
524 to insert this binding. Normally, scope == current_scope and
525 this does nothing. */
526 while (*here && (*here)->depth > scope->depth)
527 here = &(*here)->shadowed;
533 /* Clear the binding structure B, stick it on the binding_freelist,
534 and return the former value of b->prev. This is used by pop_scope
535 and get_parm_info to iterate destructively over all the bindings
536 from a given scope. */
537 static struct c_binding *
538 free_binding_and_advance (struct c_binding *b)
540 struct c_binding *prev = b->prev;
542 memset (b, 0, sizeof (struct c_binding));
543 b->prev = binding_freelist;
544 binding_freelist = b;
550 /* Hook called at end of compilation to assume 1 elt
551 for a file-scope tentative array defn that wasn't complete before. */
554 c_finish_incomplete_decl (tree decl)
556 if (TREE_CODE (decl) == VAR_DECL)
558 tree type = TREE_TYPE (decl);
559 if (type != error_mark_node
560 && TREE_CODE (type) == ARRAY_TYPE
561 && !DECL_EXTERNAL (decl)
562 && TYPE_DOMAIN (type) == 0)
564 warning (0, "array %q+D assumed to have one element", decl);
566 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
568 layout_decl (decl, 0);
573 /* The Objective-C front-end often needs to determine the current scope. */
576 objc_get_current_scope (void)
578 return current_scope;
581 /* The following function is used only by Objective-C. It needs to live here
582 because it accesses the innards of c_scope. */
585 objc_mark_locals_volatile (void *enclosing_blk)
587 struct c_scope *scope;
590 for (scope = current_scope;
591 scope && scope != enclosing_blk;
592 scope = scope->outer)
594 for (b = scope->bindings; b; b = b->prev)
595 objc_volatilize_decl (b->decl);
597 /* Do not climb up past the current function. */
598 if (scope->function_body)
603 /* Nonzero if we are currently in file scope. */
606 global_bindings_p (void)
608 return current_scope == file_scope && !c_override_global_bindings_to_false;
612 keep_next_level (void)
614 keep_next_level_flag = true;
617 /* Identify this scope as currently being filled with parameters. */
620 declare_parm_level (void)
622 current_scope->parm_flag = true;
628 if (next_is_function_body)
630 /* This is the transition from the parameters to the top level
631 of the function body. These are the same scope
632 (C99 6.2.1p4,6) so we do not push another scope structure.
633 next_is_function_body is set only by store_parm_decls, which
634 in turn is called when and only when we are about to
635 encounter the opening curly brace for the function body.
637 The outermost block of a function always gets a BLOCK node,
638 because the debugging output routines expect that each
639 function has at least one BLOCK. */
640 current_scope->parm_flag = false;
641 current_scope->function_body = true;
642 current_scope->keep = true;
643 current_scope->outer_function = current_function_scope;
644 current_function_scope = current_scope;
646 keep_next_level_flag = false;
647 next_is_function_body = false;
651 struct c_scope *scope;
654 scope = scope_freelist;
655 scope_freelist = scope->outer;
658 scope = GGC_CNEW (struct c_scope);
660 scope->keep = keep_next_level_flag;
661 scope->outer = current_scope;
662 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
664 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
666 if (current_scope && scope->depth == 0)
669 sorry ("GCC supports only %u nested scopes", scope->depth);
672 current_scope = scope;
673 keep_next_level_flag = false;
677 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
680 set_type_context (tree type, tree context)
682 for (type = TYPE_MAIN_VARIANT (type); type;
683 type = TYPE_NEXT_VARIANT (type))
684 TYPE_CONTEXT (type) = context;
687 /* Exit a scope. Restore the state of the identifier-decl mappings
688 that were in effect when this scope was entered. Return a BLOCK
689 node containing all the DECLs in this scope that are of interest
690 to debug info generation. */
695 struct c_scope *scope = current_scope;
696 tree block, context, p;
699 bool functionbody = scope->function_body;
700 bool keep = functionbody || scope->keep || scope->bindings;
702 c_end_vm_scope (scope->depth);
704 /* If appropriate, create a BLOCK to record the decls for the life
709 block = make_node (BLOCK);
710 BLOCK_SUBBLOCKS (block) = scope->blocks;
711 TREE_USED (block) = 1;
713 /* In each subblock, record that this is its superior. */
714 for (p = scope->blocks; p; p = TREE_CHAIN (p))
715 BLOCK_SUPERCONTEXT (p) = block;
717 BLOCK_VARS (block) = 0;
720 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
721 scope must be set so that they point to the appropriate
722 construct, i.e. either to the current FUNCTION_DECL node, or
723 else to the BLOCK node we just constructed.
725 Note that for tagged types whose scope is just the formal
726 parameter list for some function type specification, we can't
727 properly set their TYPE_CONTEXTs here, because we don't have a
728 pointer to the appropriate FUNCTION_TYPE node readily available
729 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
730 type nodes get set in `grokdeclarator' as soon as we have created
731 the FUNCTION_TYPE node which will represent the "scope" for these
732 "parameter list local" tagged types. */
733 if (scope->function_body)
734 context = current_function_decl;
735 else if (scope == file_scope)
737 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
738 TREE_CHAIN (file_decl) = all_translation_units;
739 all_translation_units = file_decl;
745 /* Clear all bindings in this scope. */
746 for (b = scope->bindings; b; b = free_binding_and_advance (b))
749 switch (TREE_CODE (p))
752 /* Warnings for unused labels, errors for undefined labels. */
753 if (TREE_USED (p) && !DECL_INITIAL (p))
755 error ("label %q+D used but not defined", p);
756 DECL_INITIAL (p) = error_mark_node;
758 else if (!TREE_USED (p) && warn_unused_label)
760 if (DECL_INITIAL (p))
761 warning (0, "label %q+D defined but not used", p);
763 warning (0, "label %q+D declared but not defined", p);
765 /* Labels go in BLOCK_VARS. */
766 TREE_CHAIN (p) = BLOCK_VARS (block);
767 BLOCK_VARS (block) = p;
768 gcc_assert (I_LABEL_BINDING (b->id) == b);
769 I_LABEL_BINDING (b->id) = b->shadowed;
775 set_type_context (p, context);
777 /* Types may not have tag-names, in which case the type
778 appears in the bindings list with b->id NULL. */
781 gcc_assert (I_TAG_BINDING (b->id) == b);
782 I_TAG_BINDING (b->id) = b->shadowed;
787 /* Propagate TREE_ADDRESSABLE from nested functions to their
788 containing functions. */
789 if (!TREE_ASM_WRITTEN (p)
790 && DECL_INITIAL (p) != 0
791 && TREE_ADDRESSABLE (p)
792 && DECL_ABSTRACT_ORIGIN (p) != 0
793 && DECL_ABSTRACT_ORIGIN (p) != p)
794 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
795 if (!DECL_EXTERNAL (p)
796 && DECL_INITIAL (p) == 0)
798 error ("nested function %q+D declared but never defined", p);
799 undef_nested_function = true;
804 /* Warnings for unused variables. */
806 && !DECL_IN_SYSTEM_HEADER (p)
808 && !DECL_ARTIFICIAL (p)
809 && scope != file_scope
810 && scope != external_scope)
811 warning (OPT_Wunused_variable, "unused variable %q+D", p);
815 error ("type of array %q+D completed incompatibly with"
816 " implicit initialization", p);
823 /* All of these go in BLOCK_VARS, but only if this is the
824 binding in the home scope. */
827 TREE_CHAIN (p) = BLOCK_VARS (block);
828 BLOCK_VARS (block) = p;
830 /* If this is the file scope, and we are processing more
831 than one translation unit in this compilation, set
832 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
833 This makes same_translation_unit_p work, and causes
834 static declarations to be given disambiguating suffixes. */
835 if (scope == file_scope && num_in_fnames > 1)
837 DECL_CONTEXT (p) = context;
838 if (TREE_CODE (p) == TYPE_DECL)
839 set_type_context (TREE_TYPE (p), context);
843 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
844 already been put there by store_parm_decls. Unused-
845 parameter warnings are handled by function.c.
846 error_mark_node obviously does not go in BLOCK_VARS and
847 does not get unused-variable warnings. */
850 /* It is possible for a decl not to have a name. We get
851 here with b->id NULL in this case. */
854 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
855 I_SYMBOL_BINDING (b->id) = b->shadowed;
856 if (b->shadowed && b->shadowed->type)
857 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
867 /* Dispose of the block that we just made inside some higher level. */
868 if ((scope->function_body || scope == file_scope) && context)
870 DECL_INITIAL (context) = block;
871 BLOCK_SUPERCONTEXT (block) = context;
873 else if (scope->outer)
876 SCOPE_LIST_APPEND (scope->outer, blocks, block);
877 /* If we did not make a block for the scope just exited, any
878 blocks made for inner scopes must be carried forward so they
879 will later become subblocks of something else. */
880 else if (scope->blocks)
881 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
884 /* Pop the current scope, and free the structure for reuse. */
885 current_scope = scope->outer;
886 if (scope->function_body)
887 current_function_scope = scope->outer_function;
889 memset (scope, 0, sizeof (struct c_scope));
890 scope->outer = scope_freelist;
891 scope_freelist = scope;
897 push_file_scope (void)
905 file_scope = current_scope;
907 start_fname_decls ();
909 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
910 bind (DECL_NAME (decl), decl, file_scope,
911 /*invisible=*/false, /*nested=*/true);
915 pop_file_scope (void)
917 /* In case there were missing closebraces, get us back to the global
919 while (current_scope != file_scope)
922 /* __FUNCTION__ is defined at file scope (""). This
923 call may not be necessary as my tests indicate it
924 still works without it. */
925 finish_fname_decls ();
927 /* This is the point to write out a PCH if we're doing that.
928 In that case we do not want to do anything else. */
931 c_common_write_pch ();
935 /* Pop off the file scope and close this translation unit. */
939 maybe_apply_pending_pragma_weaks ();
940 cgraph_finalize_compilation_unit ();
943 /* Insert BLOCK at the end of the list of subblocks of the current
944 scope. This is used when a BIND_EXPR is expanded, to handle the
945 BLOCK node inside the BIND_EXPR. */
948 insert_block (tree block)
950 TREE_USED (block) = 1;
951 SCOPE_LIST_APPEND (current_scope, blocks, block);
954 /* Push a definition or a declaration of struct, union or enum tag "name".
955 "type" should be the type node.
956 We assume that the tag "name" is not already defined.
958 Note that the definition may really be just a forward reference.
959 In that case, the TYPE_SIZE will be zero. */
962 pushtag (tree name, tree type)
964 /* Record the identifier as the type's name if it has none. */
965 if (name && !TYPE_NAME (type))
966 TYPE_NAME (type) = name;
967 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
969 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
970 tagged type we just added to the current scope. This fake
971 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
972 to output a representation of a tagged type, and it also gives
973 us a convenient place to record the "scope start" address for the
976 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
978 /* An approximation for now, so we can tell this is a function-scope tag.
979 This will be updated in pop_scope. */
980 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
983 /* Subroutine of compare_decls. Allow harmless mismatches in return
984 and argument types provided that the type modes match. This function
985 return a unified type given a suitable match, and 0 otherwise. */
988 match_builtin_function_types (tree newtype, tree oldtype)
990 tree newrettype, oldrettype;
991 tree newargs, oldargs;
992 tree trytype, tryargs;
994 /* Accept the return type of the new declaration if same modes. */
995 oldrettype = TREE_TYPE (oldtype);
996 newrettype = TREE_TYPE (newtype);
998 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1001 oldargs = TYPE_ARG_TYPES (oldtype);
1002 newargs = TYPE_ARG_TYPES (newtype);
1005 while (oldargs || newargs)
1009 || !TREE_VALUE (oldargs)
1010 || !TREE_VALUE (newargs)
1011 || TYPE_MODE (TREE_VALUE (oldargs))
1012 != TYPE_MODE (TREE_VALUE (newargs)))
1015 oldargs = TREE_CHAIN (oldargs);
1016 newargs = TREE_CHAIN (newargs);
1019 trytype = build_function_type (newrettype, tryargs);
1020 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1023 /* Subroutine of diagnose_mismatched_decls. Check for function type
1024 mismatch involving an empty arglist vs a nonempty one and give clearer
1027 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1028 tree newtype, tree oldtype)
1032 if (TREE_CODE (olddecl) != FUNCTION_DECL
1033 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1034 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1036 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1039 t = TYPE_ARG_TYPES (oldtype);
1041 t = TYPE_ARG_TYPES (newtype);
1042 for (; t; t = TREE_CHAIN (t))
1044 tree type = TREE_VALUE (t);
1046 if (TREE_CHAIN (t) == 0
1047 && TYPE_MAIN_VARIANT (type) != void_type_node)
1049 inform ("a parameter list with an ellipsis can%'t match "
1050 "an empty parameter name list declaration");
1054 if (c_type_promotes_to (type) != type)
1056 inform ("an argument type that has a default promotion can%'t match "
1057 "an empty parameter name list declaration");
1063 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1064 old-style function definition, NEWDECL is a prototype declaration.
1065 Diagnose inconsistencies in the argument list. Returns TRUE if
1066 the prototype is compatible, FALSE if not. */
1068 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1070 tree newargs, oldargs;
1073 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1075 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1076 newargs = TYPE_ARG_TYPES (newtype);
1081 tree oldargtype = TYPE_MAIN_VARIANT (TREE_VALUE (oldargs));
1082 tree newargtype = TYPE_MAIN_VARIANT (TREE_VALUE (newargs));
1084 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1087 /* Reaching the end of just one list means the two decls don't
1088 agree on the number of arguments. */
1089 if (END_OF_ARGLIST (oldargtype))
1091 error ("prototype for %q+D declares more arguments "
1092 "than previous old-style definition", newdecl);
1095 else if (END_OF_ARGLIST (newargtype))
1097 error ("prototype for %q+D declares fewer arguments "
1098 "than previous old-style definition", newdecl);
1102 /* Type for passing arg must be consistent with that declared
1104 else if (!comptypes (oldargtype, newargtype))
1106 error ("prototype for %q+D declares argument %d"
1107 " with incompatible type",
1112 oldargs = TREE_CHAIN (oldargs);
1113 newargs = TREE_CHAIN (newargs);
1117 /* If we get here, no errors were found, but do issue a warning
1118 for this poor-style construct. */
1119 warning (0, "prototype for %q+D follows non-prototype definition",
1122 #undef END_OF_ARGLIST
1125 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1126 first in a pair of mismatched declarations, using the diagnostic
1129 locate_old_decl (tree decl, void (*diag)(const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2))
1131 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1133 else if (DECL_INITIAL (decl))
1134 diag (G_("previous definition of %q+D was here"), decl);
1135 else if (C_DECL_IMPLICIT (decl))
1136 diag (G_("previous implicit declaration of %q+D was here"), decl);
1138 diag (G_("previous declaration of %q+D was here"), decl);
1141 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1142 Returns true if the caller should proceed to merge the two, false
1143 if OLDDECL should simply be discarded. As a side effect, issues
1144 all necessary diagnostics for invalid or poor-style combinations.
1145 If it returns true, writes the types of NEWDECL and OLDDECL to
1146 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1147 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1150 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1151 tree *newtypep, tree *oldtypep)
1153 tree newtype, oldtype;
1154 bool pedwarned = false;
1155 bool warned = false;
1158 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1159 && DECL_EXTERNAL (DECL))
1161 /* If we have error_mark_node for either decl or type, just discard
1162 the previous decl - we're in an error cascade already. */
1163 if (olddecl == error_mark_node || newdecl == error_mark_node)
1165 *oldtypep = oldtype = TREE_TYPE (olddecl);
1166 *newtypep = newtype = TREE_TYPE (newdecl);
1167 if (oldtype == error_mark_node || newtype == error_mark_node)
1170 /* Two different categories of symbol altogether. This is an error
1171 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1172 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1174 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1175 && DECL_BUILT_IN (olddecl)
1176 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1178 error ("%q+D redeclared as different kind of symbol", newdecl);
1179 locate_old_decl (olddecl, error);
1181 else if (TREE_PUBLIC (newdecl))
1182 warning (0, "built-in function %q+D declared as non-function",
1185 warning (OPT_Wshadow, "declaration of %q+D shadows "
1186 "a built-in function", newdecl);
1190 /* Enumerators have no linkage, so may only be declared once in a
1192 if (TREE_CODE (olddecl) == CONST_DECL)
1194 error ("redeclaration of enumerator %q+D", newdecl);
1195 locate_old_decl (olddecl, error);
1199 if (!comptypes (oldtype, newtype))
1201 if (TREE_CODE (olddecl) == FUNCTION_DECL
1202 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1204 /* Accept harmless mismatch in function types.
1205 This is for the ffs and fprintf builtins. */
1206 tree trytype = match_builtin_function_types (newtype, oldtype);
1208 if (trytype && comptypes (newtype, trytype))
1209 *oldtypep = oldtype = trytype;
1212 /* If types don't match for a built-in, throw away the
1213 built-in. No point in calling locate_old_decl here, it
1214 won't print anything. */
1215 warning (0, "conflicting types for built-in function %q+D",
1220 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1221 && DECL_IS_BUILTIN (olddecl))
1223 /* A conflicting function declaration for a predeclared
1224 function that isn't actually built in. Objective C uses
1225 these. The new declaration silently overrides everything
1226 but the volatility (i.e. noreturn) indication. See also
1227 below. FIXME: Make Objective C use normal builtins. */
1228 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1231 /* Permit void foo (...) to match int foo (...) if the latter is
1232 the definition and implicit int was used. See
1233 c-torture/compile/920625-2.c. */
1234 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1235 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1236 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1237 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1239 pedwarn ("conflicting types for %q+D", newdecl);
1240 /* Make sure we keep void as the return type. */
1241 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1242 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1245 /* Permit void foo (...) to match an earlier call to foo (...) with
1246 no declared type (thus, implicitly int). */
1247 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1248 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1249 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1250 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1252 pedwarn ("conflicting types for %q+D", newdecl);
1253 /* Make sure we keep void as the return type. */
1254 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1259 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1260 error ("conflicting type qualifiers for %q+D", newdecl);
1262 error ("conflicting types for %q+D", newdecl);
1263 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1264 locate_old_decl (olddecl, error);
1269 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1270 but silently ignore the redeclaration if either is in a system
1271 header. (Conflicting redeclarations were handled above.) */
1272 if (TREE_CODE (newdecl) == TYPE_DECL)
1274 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1275 return true; /* Allow OLDDECL to continue in use. */
1277 error ("redefinition of typedef %q+D", newdecl);
1278 locate_old_decl (olddecl, error);
1282 /* Function declarations can either be 'static' or 'extern' (no
1283 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1284 can never conflict with each other on account of linkage (6.2.2p4).
1285 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1286 two definitions if one is 'extern inline' and one is not. The non-
1287 extern-inline definition supersedes the extern-inline definition. */
1289 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1291 /* If you declare a built-in function name as static, or
1292 define the built-in with an old-style definition (so we
1293 can't validate the argument list) the built-in definition is
1294 overridden, but optionally warn this was a bad choice of name. */
1295 if (DECL_BUILT_IN (olddecl)
1296 && !C_DECL_DECLARED_BUILTIN (olddecl)
1297 && (!TREE_PUBLIC (newdecl)
1298 || (DECL_INITIAL (newdecl)
1299 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1301 warning (OPT_Wshadow, "declaration of %q+D shadows "
1302 "a built-in function", newdecl);
1303 /* Discard the old built-in function. */
1307 if (DECL_INITIAL (newdecl))
1309 if (DECL_INITIAL (olddecl))
1311 /* If both decls are in the same TU and the new declaration
1312 isn't overriding an extern inline reject the new decl.
1313 When we handle c99 style inline rules we'll want to reject
1316 DECL_EXTERN_INLINE (olddecl)
1317 && !DECL_EXTERN_INLINE (newdecl)
1319 if they're in the same translation unit. Until we implement
1320 the full semantics we accept the construct. */
1321 if (!(DECL_EXTERN_INLINE (olddecl)
1322 && !DECL_EXTERN_INLINE (newdecl))
1323 && same_translation_unit_p (newdecl, olddecl))
1325 error ("redefinition of %q+D", newdecl);
1326 locate_old_decl (olddecl, error);
1331 /* If we have a prototype after an old-style function definition,
1332 the argument types must be checked specially. */
1333 else if (DECL_INITIAL (olddecl)
1334 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1335 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1336 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1338 locate_old_decl (olddecl, error);
1341 /* A non-static declaration (even an "extern") followed by a
1342 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1343 The same is true for a static forward declaration at block
1344 scope followed by a non-static declaration/definition at file
1345 scope. Static followed by non-static at the same scope is
1346 not undefined behavior, and is the most convenient way to get
1347 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1348 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1349 we do diagnose it if -Wtraditional. */
1350 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1352 /* Two exceptions to the rule. If olddecl is an extern
1353 inline, or a predeclared function that isn't actually
1354 built in, newdecl silently overrides olddecl. The latter
1355 occur only in Objective C; see also above. (FIXME: Make
1356 Objective C use normal builtins.) */
1357 if (!DECL_IS_BUILTIN (olddecl)
1358 && !DECL_EXTERN_INLINE (olddecl))
1360 error ("static declaration of %q+D follows "
1361 "non-static declaration", newdecl);
1362 locate_old_decl (olddecl, error);
1366 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1368 if (DECL_CONTEXT (olddecl))
1370 error ("non-static declaration of %q+D follows "
1371 "static declaration", newdecl);
1372 locate_old_decl (olddecl, error);
1375 else if (warn_traditional)
1377 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1378 "follows static declaration", newdecl);
1383 else if (TREE_CODE (newdecl) == VAR_DECL)
1385 /* Only variables can be thread-local, and all declarations must
1386 agree on this property. */
1387 if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1389 if (DECL_THREAD_LOCAL_P (newdecl))
1390 error ("thread-local declaration of %q+D follows "
1391 "non-thread-local declaration", newdecl);
1393 error ("non-thread-local declaration of %q+D follows "
1394 "thread-local declaration", newdecl);
1396 locate_old_decl (olddecl, error);
1400 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1401 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1403 error ("redefinition of %q+D", newdecl);
1404 locate_old_decl (olddecl, error);
1408 /* Objects declared at file scope: if the first declaration had
1409 external linkage (even if it was an external reference) the
1410 second must have external linkage as well, or the behavior is
1411 undefined. If the first declaration had internal linkage, then
1412 the second must too, or else be an external reference (in which
1413 case the composite declaration still has internal linkage).
1414 As for function declarations, we warn about the static-then-
1415 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1416 if (DECL_FILE_SCOPE_P (newdecl)
1417 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1419 if (DECL_EXTERNAL (newdecl))
1421 if (!DECL_FILE_SCOPE_P (olddecl))
1423 error ("extern declaration of %q+D follows "
1424 "declaration with no linkage", newdecl);
1425 locate_old_decl (olddecl, error);
1428 else if (warn_traditional)
1430 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1431 "follows static declaration", newdecl);
1437 if (TREE_PUBLIC (newdecl))
1438 error ("non-static declaration of %q+D follows "
1439 "static declaration", newdecl);
1441 error ("static declaration of %q+D follows "
1442 "non-static declaration", newdecl);
1444 locate_old_decl (olddecl, error);
1448 /* Two objects with the same name declared at the same block
1449 scope must both be external references (6.7p3). */
1450 else if (!DECL_FILE_SCOPE_P (newdecl))
1452 if (DECL_EXTERNAL (newdecl))
1454 /* Extern with initializer at block scope, which will
1455 already have received an error. */
1457 else if (DECL_EXTERNAL (olddecl))
1459 error ("declaration of %q+D with no linkage follows "
1460 "extern declaration", newdecl);
1461 locate_old_decl (olddecl, error);
1465 error ("redeclaration of %q+D with no linkage", newdecl);
1466 locate_old_decl (olddecl, error);
1474 /* All decls must agree on a visibility. */
1475 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
1476 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1477 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1479 warning (0, "redeclaration of %q+D with different visibility "
1480 "(old visibility preserved)", newdecl);
1484 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1486 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1487 if (DECL_DECLARED_INLINE_P (newdecl)
1488 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1490 warning (OPT_Wattributes, "inline declaration of %qD follows "
1491 "declaration with attribute noinline", newdecl);
1494 else if (DECL_DECLARED_INLINE_P (olddecl)
1495 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1497 warning (OPT_Wattributes, "declaration of %q+D with attribute "
1498 "noinline follows inline declaration ", newdecl);
1502 /* Inline declaration after use or definition.
1503 ??? Should we still warn about this now we have unit-at-a-time
1504 mode and can get it right?
1505 Definitely don't complain if the decls are in different translation
1507 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1508 && same_translation_unit_p (olddecl, newdecl))
1510 if (TREE_USED (olddecl))
1512 warning (0, "%q+D declared inline after being called", olddecl);
1515 else if (DECL_INITIAL (olddecl))
1517 warning (0, "%q+D declared inline after its definition", olddecl);
1522 else /* PARM_DECL, VAR_DECL */
1524 /* Redeclaration of a parameter is a constraint violation (this is
1525 not explicitly stated, but follows from C99 6.7p3 [no more than
1526 one declaration of the same identifier with no linkage in the
1527 same scope, except type tags] and 6.2.2p6 [parameters have no
1528 linkage]). We must check for a forward parameter declaration,
1529 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1530 an extension, the mandatory diagnostic for which is handled by
1531 mark_forward_parm_decls. */
1533 if (TREE_CODE (newdecl) == PARM_DECL
1534 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1536 error ("redefinition of parameter %q+D", newdecl);
1537 locate_old_decl (olddecl, error);
1542 /* Optional warning for completely redundant decls. */
1543 if (!warned && !pedwarned
1544 && warn_redundant_decls
1545 /* Don't warn about a function declaration followed by a
1547 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1548 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1549 /* Don't warn about redundant redeclarations of builtins. */
1550 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1551 && !DECL_BUILT_IN (newdecl)
1552 && DECL_BUILT_IN (olddecl)
1553 && !C_DECL_DECLARED_BUILTIN (olddecl))
1554 /* Don't warn about an extern followed by a definition. */
1555 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1556 /* Don't warn about forward parameter decls. */
1557 && !(TREE_CODE (newdecl) == PARM_DECL
1558 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1560 warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
1565 /* Report location of previous decl/defn in a consistent manner. */
1566 if (warned || pedwarned)
1567 locate_old_decl (olddecl, pedwarned ? pedwarn : warning0);
1569 #undef DECL_EXTERN_INLINE
1574 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1575 consistent with OLDDECL, but carries new information. Merge the
1576 new information into OLDDECL. This function issues no
1580 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1582 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1583 && DECL_INITIAL (newdecl) != 0);
1584 int new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
1585 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
1586 int old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
1587 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
1589 /* For real parm decl following a forward decl, rechain the old decl
1590 in its new location and clear TREE_ASM_WRITTEN (it's not a
1591 forward decl anymore). */
1592 if (TREE_CODE (newdecl) == PARM_DECL
1593 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1595 struct c_binding *b, **here;
1597 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1598 if ((*here)->decl == olddecl)
1605 b->prev = current_scope->bindings;
1606 current_scope->bindings = b;
1608 TREE_ASM_WRITTEN (olddecl) = 0;
1611 DECL_ATTRIBUTES (newdecl)
1612 = targetm.merge_decl_attributes (olddecl, newdecl);
1614 /* Merge the data types specified in the two decls. */
1616 = TREE_TYPE (olddecl)
1617 = composite_type (newtype, oldtype);
1619 /* Lay the type out, unless already done. */
1620 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1622 if (TREE_TYPE (newdecl) != error_mark_node)
1623 layout_type (TREE_TYPE (newdecl));
1624 if (TREE_CODE (newdecl) != FUNCTION_DECL
1625 && TREE_CODE (newdecl) != TYPE_DECL
1626 && TREE_CODE (newdecl) != CONST_DECL)
1627 layout_decl (newdecl, 0);
1631 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1632 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1633 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1634 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1635 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1636 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1638 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1639 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1644 /* Merge the type qualifiers. */
1645 if (TREE_READONLY (newdecl))
1646 TREE_READONLY (olddecl) = 1;
1648 if (TREE_THIS_VOLATILE (newdecl))
1650 TREE_THIS_VOLATILE (olddecl) = 1;
1651 if (TREE_CODE (newdecl) == VAR_DECL)
1652 make_var_volatile (newdecl);
1655 /* Merge deprecatedness. */
1656 if (TREE_DEPRECATED (newdecl))
1657 TREE_DEPRECATED (olddecl) = 1;
1659 /* Keep source location of definition rather than declaration and of
1660 prototype rather than non-prototype unless that prototype is
1662 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1663 || (old_is_prototype && !new_is_prototype
1664 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1665 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1667 /* Merge the unused-warning information. */
1668 if (DECL_IN_SYSTEM_HEADER (olddecl))
1669 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1670 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1671 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1673 /* Merge the initialization information. */
1674 if (DECL_INITIAL (newdecl) == 0)
1675 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1677 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1679 /* Merge the section attribute.
1680 We want to issue an error if the sections conflict but that must be
1681 done later in decl_attributes since we are called before attributes
1683 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1684 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1686 /* Copy the assembler name.
1687 Currently, it can only be defined in the prototype. */
1688 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1690 /* Use visibility of whichever declaration had it specified */
1691 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1693 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1694 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1697 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1699 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1700 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1701 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1702 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1703 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1704 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1705 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1706 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1707 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1708 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1711 /* Merge the storage class information. */
1712 merge_weak (newdecl, olddecl);
1714 /* For functions, static overrides non-static. */
1715 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1717 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1718 /* This is since we don't automatically
1719 copy the attributes of NEWDECL into OLDDECL. */
1720 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1721 /* If this clears `static', clear it in the identifier too. */
1722 if (!TREE_PUBLIC (olddecl))
1723 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1727 if (DECL_EXTERNAL (newdecl))
1729 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1730 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1732 /* An extern decl does not override previous storage class. */
1733 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1734 if (!DECL_EXTERNAL (newdecl))
1736 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1737 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1742 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1743 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1746 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1748 /* If we're redefining a function previously defined as extern
1749 inline, make sure we emit debug info for the inline before we
1750 throw it away, in case it was inlined into a function that hasn't
1751 been written out yet. */
1752 if (new_is_definition && DECL_INITIAL (olddecl))
1754 if (TREE_USED (olddecl)
1755 /* In unit-at-a-time mode we never inline re-defined extern
1756 inline functions. */
1757 && !flag_unit_at_a_time
1758 && cgraph_function_possibly_inlined_p (olddecl))
1759 (*debug_hooks->outlining_inline_function) (olddecl);
1761 /* The new defn must not be inline. */
1762 DECL_INLINE (newdecl) = 0;
1763 DECL_UNINLINABLE (newdecl) = 1;
1767 /* If either decl says `inline', this fn is inline,
1768 unless its definition was passed already. */
1769 if (DECL_DECLARED_INLINE_P (newdecl)
1770 || DECL_DECLARED_INLINE_P (olddecl))
1771 DECL_DECLARED_INLINE_P (newdecl) = 1;
1773 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1774 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1777 if (DECL_BUILT_IN (olddecl))
1779 /* If redeclaring a builtin function, it stays built in.
1780 But it gets tagged as having been declared. */
1781 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1782 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1783 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1784 if (new_is_prototype)
1785 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1787 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1788 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1791 /* Also preserve various other info from the definition. */
1792 if (!new_is_definition)
1794 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1795 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1796 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1797 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1798 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1800 /* Set DECL_INLINE on the declaration if we've got a body
1801 from which to instantiate. */
1802 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1804 DECL_INLINE (newdecl) = 1;
1805 DECL_ABSTRACT_ORIGIN (newdecl)
1806 = DECL_ABSTRACT_ORIGIN (olddecl);
1811 /* If a previous declaration said inline, mark the
1812 definition as inlinable. */
1813 if (DECL_DECLARED_INLINE_P (newdecl)
1814 && !DECL_UNINLINABLE (newdecl))
1815 DECL_INLINE (newdecl) = 1;
1819 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1820 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1822 unsigned olddecl_uid = DECL_UID (olddecl);
1823 tree olddecl_context = DECL_CONTEXT (olddecl);
1825 memcpy ((char *) olddecl + sizeof (struct tree_common),
1826 (char *) newdecl + sizeof (struct tree_common),
1827 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1828 switch (TREE_CODE (olddecl))
1838 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1839 (char *) newdecl + sizeof (struct tree_decl_common),
1840 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1845 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1846 (char *) newdecl + sizeof (struct tree_decl_common),
1847 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1849 DECL_UID (olddecl) = olddecl_uid;
1850 DECL_CONTEXT (olddecl) = olddecl_context;
1853 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1854 so that encode_section_info has a chance to look at the new decl
1855 flags and attributes. */
1856 if (DECL_RTL_SET_P (olddecl)
1857 && (TREE_CODE (olddecl) == FUNCTION_DECL
1858 || (TREE_CODE (olddecl) == VAR_DECL
1859 && TREE_STATIC (olddecl))))
1860 make_decl_rtl (olddecl);
1863 /* Handle when a new declaration NEWDECL has the same name as an old
1864 one OLDDECL in the same binding contour. Prints an error message
1867 If safely possible, alter OLDDECL to look like NEWDECL, and return
1868 true. Otherwise, return false. */
1871 duplicate_decls (tree newdecl, tree olddecl)
1873 tree newtype = NULL, oldtype = NULL;
1875 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1878 merge_decls (newdecl, olddecl, newtype, oldtype);
1883 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1885 warn_if_shadowing (tree new_decl)
1887 struct c_binding *b;
1889 /* Shadow warnings wanted? */
1891 /* No shadow warnings for internally generated vars. */
1892 || DECL_IS_BUILTIN (new_decl)
1893 /* No shadow warnings for vars made for inlining. */
1894 || DECL_FROM_INLINE (new_decl)
1895 /* Don't warn about the parm names in function declarator
1896 within a function declarator. It would be nice to avoid
1897 warning in any function declarator in a declaration, as
1898 opposed to a definition, but there is no way to tell
1899 it's not a definition at this point. */
1900 || (TREE_CODE (new_decl) == PARM_DECL && current_scope->outer->parm_flag))
1903 /* Is anything being shadowed? Invisible decls do not count. */
1904 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1905 if (b->decl && b->decl != new_decl && !b->invisible)
1907 tree old_decl = b->decl;
1909 if (old_decl == error_mark_node)
1911 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1912 "non-variable", new_decl);
1915 else if (TREE_CODE (old_decl) == PARM_DECL)
1916 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
1918 else if (DECL_FILE_SCOPE_P (old_decl))
1919 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
1920 "declaration", new_decl);
1921 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1922 && DECL_BUILT_IN (old_decl))
1924 warning (OPT_Wshadow, "declaration of %q+D shadows "
1925 "a built-in function", new_decl);
1929 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
1932 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
1939 /* Subroutine of pushdecl.
1941 X is a TYPE_DECL for a typedef statement. Create a brand new
1942 ..._TYPE node (which will be just a variant of the existing
1943 ..._TYPE node with identical properties) and then install X
1944 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1946 The whole point here is to end up with a situation where each
1947 and every ..._TYPE node the compiler creates will be uniquely
1948 associated with AT MOST one node representing a typedef name.
1949 This way, even though the compiler substitutes corresponding
1950 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1951 early on, later parts of the compiler can always do the reverse
1952 translation and get back the corresponding typedef name. For
1955 typedef struct S MY_TYPE;
1958 Later parts of the compiler might only know that `object' was of
1959 type `struct S' if it were not for code just below. With this
1960 code however, later parts of the compiler see something like:
1962 struct S' == struct S
1963 typedef struct S' MY_TYPE;
1966 And they can then deduce (from the node for type struct S') that
1967 the original object declaration was:
1971 Being able to do this is important for proper support of protoize,
1972 and also for generating precise symbolic debugging information
1973 which takes full account of the programmer's (typedef) vocabulary.
1975 Obviously, we don't want to generate a duplicate ..._TYPE node if
1976 the TYPE_DECL node that we are now processing really represents a
1977 standard built-in type.
1979 Since all standard types are effectively declared at line zero
1980 in the source file, we can easily check to see if we are working
1981 on a standard type by checking the current value of lineno. */
1984 clone_underlying_type (tree x)
1986 if (DECL_IS_BUILTIN (x))
1988 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1989 TYPE_NAME (TREE_TYPE (x)) = x;
1991 else if (TREE_TYPE (x) != error_mark_node
1992 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1994 tree tt = TREE_TYPE (x);
1995 DECL_ORIGINAL_TYPE (x) = tt;
1996 tt = build_variant_type_copy (tt);
1998 TREE_USED (tt) = TREE_USED (x);
2003 /* Record a decl-node X as belonging to the current lexical scope.
2004 Check for errors (such as an incompatible declaration for the same
2005 name already seen in the same scope).
2007 Returns either X or an old decl for the same name.
2008 If an old decl is returned, it may have been smashed
2009 to agree with what X says. */
2014 tree name = DECL_NAME (x);
2015 struct c_scope *scope = current_scope;
2016 struct c_binding *b;
2017 bool nested = false;
2019 /* Functions need the lang_decl data. */
2020 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
2021 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
2023 /* Must set DECL_CONTEXT for everything not at file scope or
2024 DECL_FILE_SCOPE_P won't work. Local externs don't count
2025 unless they have initializers (which generate code). */
2026 if (current_function_decl
2027 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2028 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2029 DECL_CONTEXT (x) = current_function_decl;
2031 /* If this is of variably modified type, prevent jumping into its
2033 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2034 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2035 c_begin_vm_scope (scope->depth);
2037 /* Anonymous decls are just inserted in the scope. */
2040 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
2044 /* First, see if there is another declaration with the same name in
2045 the current scope. If there is, duplicate_decls may do all the
2046 work for us. If duplicate_decls returns false, that indicates
2047 two incompatible decls in the same scope; we are to silently
2048 replace the old one (duplicate_decls has issued all appropriate
2049 diagnostics). In particular, we should not consider possible
2050 duplicates in the external scope, or shadowing. */
2051 b = I_SYMBOL_BINDING (name);
2052 if (b && B_IN_SCOPE (b, scope))
2054 struct c_binding *b_ext, *b_use;
2055 tree type = TREE_TYPE (x);
2056 tree visdecl = b->decl;
2057 tree vistype = TREE_TYPE (visdecl);
2058 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2059 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2060 b->inner_comp = false;
2063 /* If this is an external linkage declaration, we should check
2064 for compatibility with the type in the external scope before
2065 setting the type at this scope based on the visible
2066 information only. */
2067 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2069 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2070 b_ext = b_ext->shadowed;
2075 TREE_TYPE (b_use->decl) = b_use->type;
2078 if (duplicate_decls (x, b_use->decl))
2082 /* Save the updated type in the external scope and
2083 restore the proper type for this scope. */
2085 if (comptypes (vistype, type))
2086 thistype = composite_type (vistype, type);
2088 thistype = TREE_TYPE (b_use->decl);
2089 b_use->type = TREE_TYPE (b_use->decl);
2090 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2091 && DECL_BUILT_IN (b_use->decl))
2093 = build_type_attribute_variant (thistype,
2096 TREE_TYPE (b_use->decl) = thistype;
2101 goto skip_external_and_shadow_checks;
2104 /* All declarations with external linkage, and all external
2105 references, go in the external scope, no matter what scope is
2106 current. However, the binding in that scope is ignored for
2107 purposes of normal name lookup. A separate binding structure is
2108 created in the requested scope; this governs the normal
2109 visibility of the symbol.
2111 The binding in the externals scope is used exclusively for
2112 detecting duplicate declarations of the same object, no matter
2113 what scope they are in; this is what we do here. (C99 6.2.7p2:
2114 All declarations that refer to the same object or function shall
2115 have compatible type; otherwise, the behavior is undefined.) */
2116 if (DECL_EXTERNAL (x) || scope == file_scope)
2118 tree type = TREE_TYPE (x);
2121 bool type_saved = false;
2122 if (b && !B_IN_EXTERNAL_SCOPE (b)
2123 && (TREE_CODE (b->decl) == FUNCTION_DECL
2124 || TREE_CODE (b->decl) == VAR_DECL)
2125 && DECL_FILE_SCOPE_P (b->decl))
2128 vistype = TREE_TYPE (visdecl);
2130 if (scope != file_scope
2131 && !DECL_IN_SYSTEM_HEADER (x))
2132 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2134 while (b && !B_IN_EXTERNAL_SCOPE (b))
2136 /* If this decl might be modified, save its type. This is
2137 done here rather than when the decl is first bound
2138 because the type may change after first binding, through
2139 being completed or through attributes being added. If we
2140 encounter multiple such decls, only the first should have
2141 its type saved; the others will already have had their
2142 proper types saved and the types will not have changed as
2143 their scopes will not have been re-entered. */
2144 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2146 b->type = TREE_TYPE (b->decl);
2149 if (B_IN_FILE_SCOPE (b)
2150 && TREE_CODE (b->decl) == VAR_DECL
2151 && TREE_STATIC (b->decl)
2152 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2153 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2154 && TREE_CODE (type) == ARRAY_TYPE
2155 && TYPE_DOMAIN (type)
2156 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2157 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2159 /* Array type completed in inner scope, which should be
2160 diagnosed if the completion does not have size 1 and
2161 it does not get completed in the file scope. */
2162 b->inner_comp = true;
2167 /* If a matching external declaration has been found, set its
2168 type to the composite of all the types of that declaration.
2169 After the consistency checks, it will be reset to the
2170 composite of the visible types only. */
2171 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2173 TREE_TYPE (b->decl) = b->type;
2175 /* The point of the same_translation_unit_p check here is,
2176 we want to detect a duplicate decl for a construct like
2177 foo() { extern bar(); } ... static bar(); but not if
2178 they are in different translation units. In any case,
2179 the static does not go in the externals scope. */
2181 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2182 && duplicate_decls (x, b->decl))
2187 if (comptypes (vistype, type))
2188 thistype = composite_type (vistype, type);
2190 thistype = TREE_TYPE (b->decl);
2194 b->type = TREE_TYPE (b->decl);
2195 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2197 = build_type_attribute_variant (thistype,
2198 TYPE_ATTRIBUTES (b->type));
2199 TREE_TYPE (b->decl) = thistype;
2200 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2203 else if (TREE_PUBLIC (x))
2205 if (visdecl && !b && duplicate_decls (x, visdecl))
2207 /* An external declaration at block scope referring to a
2208 visible entity with internal linkage. The composite
2209 type will already be correct for this scope, so we
2210 just need to fall through to make the declaration in
2217 bind (name, x, external_scope, /*invisible=*/true,
2224 warn_if_shadowing (x);
2226 skip_external_and_shadow_checks:
2227 if (TREE_CODE (x) == TYPE_DECL)
2228 clone_underlying_type (x);
2230 bind (name, x, scope, /*invisible=*/false, nested);
2232 /* If x's type is incomplete because it's based on a
2233 structure or union which has not yet been fully declared,
2234 attach it to that structure or union type, so we can go
2235 back and complete the variable declaration later, if the
2236 structure or union gets fully declared.
2238 If the input is erroneous, we can have error_mark in the type
2239 slot (e.g. "f(void a, ...)") - that doesn't count as an
2241 if (TREE_TYPE (x) != error_mark_node
2242 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2244 tree element = TREE_TYPE (x);
2246 while (TREE_CODE (element) == ARRAY_TYPE)
2247 element = TREE_TYPE (element);
2248 element = TYPE_MAIN_VARIANT (element);
2250 if ((TREE_CODE (element) == RECORD_TYPE
2251 || TREE_CODE (element) == UNION_TYPE)
2252 && (TREE_CODE (x) != TYPE_DECL
2253 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2254 && !COMPLETE_TYPE_P (element))
2255 C_TYPE_INCOMPLETE_VARS (element)
2256 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2261 /* Record X as belonging to file scope.
2262 This is used only internally by the Objective-C front end,
2263 and is limited to its needs. duplicate_decls is not called;
2264 if there is any preexisting decl for this identifier, it is an ICE. */
2267 pushdecl_top_level (tree x)
2270 bool nested = false;
2271 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2273 name = DECL_NAME (x);
2275 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2277 if (TREE_PUBLIC (x))
2279 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2283 bind (name, x, file_scope, /*invisible=*/false, nested);
2289 implicit_decl_warning (tree id, tree olddecl)
2291 void (*diag) (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
2292 switch (mesg_implicit_function_declaration)
2295 case 1: diag = warning0; break;
2296 case 2: diag = error; break;
2297 default: gcc_unreachable ();
2300 diag (G_("implicit declaration of function %qE"), id);
2302 locate_old_decl (olddecl, diag);
2305 /* Generate an implicit declaration for identifier FUNCTIONID as a
2306 function of type int (). */
2309 implicitly_declare (tree functionid)
2311 struct c_binding *b;
2315 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2317 if (B_IN_SCOPE (b, external_scope))
2326 if (decl == error_mark_node)
2329 /* FIXME: Objective-C has weird not-really-builtin functions
2330 which are supposed to be visible automatically. They wind up
2331 in the external scope because they're pushed before the file
2332 scope gets created. Catch this here and rebind them into the
2334 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2336 bind (functionid, decl, file_scope,
2337 /*invisible=*/false, /*nested=*/true);
2342 tree newtype = default_function_type;
2344 TREE_TYPE (decl) = b->type;
2345 /* Implicit declaration of a function already declared
2346 (somehow) in a different scope, or as a built-in.
2347 If this is the first time this has happened, warn;
2348 then recycle the old declaration but with the new type. */
2349 if (!C_DECL_IMPLICIT (decl))
2351 implicit_decl_warning (functionid, decl);
2352 C_DECL_IMPLICIT (decl) = 1;
2354 if (DECL_BUILT_IN (decl))
2356 newtype = build_type_attribute_variant (newtype,
2358 (TREE_TYPE (decl)));
2359 if (!comptypes (newtype, TREE_TYPE (decl)))
2361 warning (0, "incompatible implicit declaration of built-in"
2362 " function %qD", decl);
2363 newtype = TREE_TYPE (decl);
2368 if (!comptypes (newtype, TREE_TYPE (decl)))
2370 error ("incompatible implicit declaration of function %qD",
2372 locate_old_decl (decl, error);
2375 b->type = TREE_TYPE (decl);
2376 TREE_TYPE (decl) = newtype;
2377 bind (functionid, decl, current_scope,
2378 /*invisible=*/false, /*nested=*/true);
2383 /* Not seen before. */
2384 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2385 DECL_EXTERNAL (decl) = 1;
2386 TREE_PUBLIC (decl) = 1;
2387 C_DECL_IMPLICIT (decl) = 1;
2388 implicit_decl_warning (functionid, 0);
2389 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2391 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2393 /* C89 says implicit declarations are in the innermost block.
2394 So we record the decl in the standard fashion. */
2395 decl = pushdecl (decl);
2397 /* No need to call objc_check_decl here - it's a function type. */
2398 rest_of_decl_compilation (decl, 0, 0);
2400 /* Write a record describing this implicit function declaration
2401 to the prototypes file (if requested). */
2402 gen_aux_info_record (decl, 0, 1, 0);
2404 /* Possibly apply some default attributes to this implicit declaration. */
2405 decl_attributes (&decl, NULL_TREE, 0);
2410 /* Issue an error message for a reference to an undeclared variable
2411 ID, including a reference to a builtin outside of function-call
2412 context. Establish a binding of the identifier to error_mark_node
2413 in an appropriate scope, which will suppress further errors for the
2414 same identifier. The error message should be given location LOC. */
2416 undeclared_variable (tree id, location_t loc)
2418 static bool already = false;
2419 struct c_scope *scope;
2421 if (current_function_decl == 0)
2423 error ("%H%qE undeclared here (not in a function)", &loc, id);
2424 scope = current_scope;
2428 error ("%H%qE undeclared (first use in this function)", &loc, id);
2432 error ("%H(Each undeclared identifier is reported only once", &loc);
2433 error ("%Hfor each function it appears in.)", &loc);
2437 /* If we are parsing old-style parameter decls, current_function_decl
2438 will be nonnull but current_function_scope will be null. */
2439 scope = current_function_scope ? current_function_scope : current_scope;
2441 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2444 /* Subroutine of lookup_label, declare_label, define_label: construct a
2445 LABEL_DECL with all the proper frills. */
2448 make_label (tree name, location_t location)
2450 tree label = build_decl (LABEL_DECL, name, void_type_node);
2452 DECL_CONTEXT (label) = current_function_decl;
2453 DECL_MODE (label) = VOIDmode;
2454 DECL_SOURCE_LOCATION (label) = location;
2459 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2460 Create one if none exists so far for the current function.
2461 This is called when a label is used in a goto expression or
2462 has its address taken. */
2465 lookup_label (tree name)
2469 if (current_function_decl == 0)
2471 error ("label %qE referenced outside of any function", name);
2475 /* Use a label already defined or ref'd with this name, but not if
2476 it is inherited from a containing function and wasn't declared
2478 label = I_LABEL_DECL (name);
2479 if (label && (DECL_CONTEXT (label) == current_function_decl
2480 || C_DECLARED_LABEL_FLAG (label)))
2482 /* If the label has only been declared, update its apparent
2483 location to point here, for better diagnostics if it
2484 turns out not to have been defined. */
2485 if (!TREE_USED (label))
2486 DECL_SOURCE_LOCATION (label) = input_location;
2490 /* No label binding for that identifier; make one. */
2491 label = make_label (name, input_location);
2493 /* Ordinary labels go in the current function scope. */
2494 bind (name, label, current_function_scope,
2495 /*invisible=*/false, /*nested=*/false);
2499 /* Make a label named NAME in the current function, shadowing silently
2500 any that may be inherited from containing functions or containing
2501 scopes. This is called for __label__ declarations. */
2504 declare_label (tree name)
2506 struct c_binding *b = I_LABEL_BINDING (name);
2509 /* Check to make sure that the label hasn't already been declared
2511 if (b && B_IN_CURRENT_SCOPE (b))
2513 error ("duplicate label declaration %qE", name);
2514 locate_old_decl (b->decl, error);
2516 /* Just use the previous declaration. */
2520 label = make_label (name, input_location);
2521 C_DECLARED_LABEL_FLAG (label) = 1;
2523 /* Declared labels go in the current scope. */
2524 bind (name, label, current_scope,
2525 /*invisible=*/false, /*nested=*/false);
2529 /* Define a label, specifying the location in the source file.
2530 Return the LABEL_DECL node for the label, if the definition is valid.
2531 Otherwise return 0. */
2534 define_label (location_t location, tree name)
2536 /* Find any preexisting label with this name. It is an error
2537 if that label has already been defined in this function, or
2538 if there is a containing function with a declared label with
2540 tree label = I_LABEL_DECL (name);
2541 struct c_label_list *nlist_se, *nlist_vm;
2544 && ((DECL_CONTEXT (label) == current_function_decl
2545 && DECL_INITIAL (label) != 0)
2546 || (DECL_CONTEXT (label) != current_function_decl
2547 && C_DECLARED_LABEL_FLAG (label))))
2549 error ("%Hduplicate label %qD", &location, label);
2550 locate_old_decl (label, error);
2553 else if (label && DECL_CONTEXT (label) == current_function_decl)
2555 /* The label has been used or declared already in this function,
2556 but not defined. Update its location to point to this
2558 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2559 error ("%Jjump into statement expression", label);
2560 if (C_DECL_UNDEFINABLE_VM (label))
2561 error ("%Jjump into scope of identifier with variably modified type",
2563 DECL_SOURCE_LOCATION (label) = location;
2567 /* No label binding for that identifier; make one. */
2568 label = make_label (name, location);
2570 /* Ordinary labels go in the current function scope. */
2571 bind (name, label, current_function_scope,
2572 /*invisible=*/false, /*nested=*/false);
2575 if (!in_system_header && lookup_name (name))
2576 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2577 "for labels, identifier %qE conflicts", &location, name);
2579 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2580 nlist_se->next = label_context_stack_se->labels_def;
2581 nlist_se->label = label;
2582 label_context_stack_se->labels_def = nlist_se;
2584 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2585 nlist_vm->next = label_context_stack_vm->labels_def;
2586 nlist_vm->label = label;
2587 label_context_stack_vm->labels_def = nlist_vm;
2589 /* Mark label as having been defined. */
2590 DECL_INITIAL (label) = error_mark_node;
2594 /* Given NAME, an IDENTIFIER_NODE,
2595 return the structure (or union or enum) definition for that name.
2596 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2597 CODE says which kind of type the caller wants;
2598 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2599 If the wrong kind of type is found, an error is reported. */
2602 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2604 struct c_binding *b = I_TAG_BINDING (name);
2610 /* We only care about whether it's in this level if
2611 thislevel_only was set or it might be a type clash. */
2612 if (thislevel_only || TREE_CODE (b->decl) != code)
2614 /* For our purposes, a tag in the external scope is the same as
2615 a tag in the file scope. (Primarily relevant to Objective-C
2616 and its builtin structure tags, which get pushed before the
2617 file scope is created.) */
2618 if (B_IN_CURRENT_SCOPE (b)
2619 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2623 if (thislevel_only && !thislevel)
2626 if (TREE_CODE (b->decl) != code)
2628 /* Definition isn't the kind we were looking for. */
2629 pending_invalid_xref = name;
2630 pending_invalid_xref_location = input_location;
2632 /* If in the same binding level as a declaration as a tag
2633 of a different type, this must not be allowed to
2634 shadow that tag, so give the error immediately.
2635 (For example, "struct foo; union foo;" is invalid.) */
2637 pending_xref_error ();
2642 /* Print an error message now
2643 for a recent invalid struct, union or enum cross reference.
2644 We don't print them immediately because they are not invalid
2645 when used in the `struct foo;' construct for shadowing. */
2648 pending_xref_error (void)
2650 if (pending_invalid_xref != 0)
2651 error ("%H%qE defined as wrong kind of tag",
2652 &pending_invalid_xref_location, pending_invalid_xref);
2653 pending_invalid_xref = 0;
2657 /* Look up NAME in the current scope and its superiors
2658 in the namespace of variables, functions and typedefs.
2659 Return a ..._DECL node of some kind representing its definition,
2660 or return 0 if it is undefined. */
2663 lookup_name (tree name)
2665 struct c_binding *b = I_SYMBOL_BINDING (name);
2666 if (b && !b->invisible)
2671 /* Similar to `lookup_name' but look only at the indicated scope. */
2674 lookup_name_in_scope (tree name, struct c_scope *scope)
2676 struct c_binding *b;
2678 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2679 if (B_IN_SCOPE (b, scope))
2684 /* Create the predefined scalar types of C,
2685 and some nodes representing standard constants (0, 1, (void *) 0).
2686 Initialize the global scope.
2687 Make definitions for built-in primitive functions. */
2690 c_init_decl_processing (void)
2692 location_t save_loc = input_location;
2694 /* Initialize reserved words for parser. */
2697 current_function_decl = 0;
2699 gcc_obstack_init (&parser_obstack);
2701 /* Make the externals scope. */
2703 external_scope = current_scope;
2705 /* Declarations from c_common_nodes_and_builtins must not be associated
2706 with this input file, lest we get differences between using and not
2707 using preprocessed headers. */
2708 #ifdef USE_MAPPED_LOCATION
2709 input_location = BUILTINS_LOCATION;
2711 input_location.file = "<built-in>";
2712 input_location.line = 0;
2715 build_common_tree_nodes (flag_signed_char, false);
2717 c_common_nodes_and_builtins ();
2719 /* In C, comparisons and TRUTH_* expressions have type int. */
2720 truthvalue_type_node = integer_type_node;
2721 truthvalue_true_node = integer_one_node;
2722 truthvalue_false_node = integer_zero_node;
2724 /* Even in C99, which has a real boolean type. */
2725 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2726 boolean_type_node));
2728 input_location = save_loc;
2730 pedantic_lvalues = true;
2732 make_fname_decl = c_make_fname_decl;
2733 start_fname_decls ();
2736 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2737 decl, NAME is the initialization string and TYPE_DEP indicates whether
2738 NAME depended on the type of the function. As we don't yet implement
2739 delayed emission of static data, we mark the decl as emitted
2740 so it is not placed in the output. Anything using it must therefore pull
2741 out the STRING_CST initializer directly. FIXME. */
2744 c_make_fname_decl (tree id, int type_dep)
2746 const char *name = fname_as_string (type_dep);
2747 tree decl, type, init;
2748 size_t length = strlen (name);
2750 type = build_array_type (char_type_node,
2751 build_index_type (size_int (length)));
2752 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2754 decl = build_decl (VAR_DECL, id, type);
2756 TREE_STATIC (decl) = 1;
2757 TREE_READONLY (decl) = 1;
2758 DECL_ARTIFICIAL (decl) = 1;
2760 init = build_string (length + 1, name);
2761 free ((char *) name);
2762 TREE_TYPE (init) = type;
2763 DECL_INITIAL (decl) = init;
2765 TREE_USED (decl) = 1;
2767 if (current_function_decl)
2769 DECL_CONTEXT (decl) = current_function_decl;
2770 bind (id, decl, current_function_scope,
2771 /*invisible=*/false, /*nested=*/false);
2774 finish_decl (decl, init, NULL_TREE);
2779 /* Return a definition for a builtin function named NAME and whose data type
2780 is TYPE. TYPE should be a function type with argument types.
2781 FUNCTION_CODE tells later passes how to compile calls to this function.
2782 See tree.h for its possible values.
2784 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2785 the name to be called if we can't opencode the function. If
2786 ATTRS is nonzero, use that for the function's attribute list. */
2789 builtin_function (const char *name, tree type, int function_code,
2790 enum built_in_class cl, const char *library_name,
2793 tree id = get_identifier (name);
2794 tree decl = build_decl (FUNCTION_DECL, id, type);
2795 TREE_PUBLIC (decl) = 1;
2796 DECL_EXTERNAL (decl) = 1;
2797 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2798 DECL_BUILT_IN_CLASS (decl) = cl;
2799 DECL_FUNCTION_CODE (decl) = function_code;
2800 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2802 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2804 /* Should never be called on a symbol with a preexisting meaning. */
2805 gcc_assert (!I_SYMBOL_BINDING (id));
2807 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2809 /* Builtins in the implementation namespace are made visible without
2810 needing to be explicitly declared. See push_file_scope. */
2811 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2813 TREE_CHAIN (decl) = visible_builtins;
2814 visible_builtins = decl;
2817 /* Possibly apply some default attributes to this built-in function. */
2819 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2821 decl_attributes (&decl, NULL_TREE, 0);
2826 /* Called when a declaration is seen that contains no names to declare.
2827 If its type is a reference to a structure, union or enum inherited
2828 from a containing scope, shadow that tag name for the current scope
2829 with a forward reference.
2830 If its type defines a new named structure or union
2831 or defines an enum, it is valid but we need not do anything here.
2832 Otherwise, it is an error. */
2835 shadow_tag (const struct c_declspecs *declspecs)
2837 shadow_tag_warned (declspecs, 0);
2840 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2843 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2845 bool found_tag = false;
2847 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2849 tree value = declspecs->type;
2850 enum tree_code code = TREE_CODE (value);
2852 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2853 /* Used to test also that TYPE_SIZE (value) != 0.
2854 That caused warning for `struct foo;' at top level in the file. */
2856 tree name = TYPE_NAME (value);
2863 if (warned != 1 && code != ENUMERAL_TYPE)
2864 /* Empty unnamed enum OK */
2866 pedwarn ("unnamed struct/union that defines no instances");
2870 else if (!declspecs->tag_defined_p
2871 && declspecs->storage_class != csc_none)
2874 pedwarn ("empty declaration with storage class specifier "
2875 "does not redeclare tag");
2877 pending_xref_error ();
2879 else if (!declspecs->tag_defined_p
2880 && (declspecs->const_p
2881 || declspecs->volatile_p
2882 || declspecs->restrict_p))
2885 pedwarn ("empty declaration with type qualifier "
2886 "does not redeclare tag");
2888 pending_xref_error ();
2892 pending_invalid_xref = 0;
2893 t = lookup_tag (code, name, 1);
2897 t = make_node (code);
2904 if (warned != 1 && !in_system_header)
2906 pedwarn ("useless type name in empty declaration");
2911 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2913 pedwarn ("useless type name in empty declaration");
2917 pending_invalid_xref = 0;
2919 if (declspecs->inline_p)
2921 error ("%<inline%> in empty declaration");
2925 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2927 error ("%<auto%> in file-scope empty declaration");
2931 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2933 error ("%<register%> in file-scope empty declaration");
2937 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2939 warning (0, "useless storage class specifier in empty declaration");
2943 if (!warned && !in_system_header && declspecs->thread_p)
2945 warning (0, "useless %<__thread%> in empty declaration");
2949 if (!warned && !in_system_header && (declspecs->const_p
2950 || declspecs->volatile_p
2951 || declspecs->restrict_p))
2953 warning (0, "useless type qualifier in empty declaration");
2960 pedwarn ("empty declaration");
2965 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2966 bits. SPECS represents declaration specifiers that the grammar
2967 only permits to contain type qualifiers and attributes. */
2970 quals_from_declspecs (const struct c_declspecs *specs)
2972 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2973 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2974 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2975 gcc_assert (!specs->type
2976 && !specs->decl_attr
2977 && specs->typespec_word == cts_none
2978 && specs->storage_class == csc_none
2979 && !specs->typedef_p
2980 && !specs->explicit_signed_p
2981 && !specs->deprecated_p
2983 && !specs->long_long_p
2986 && !specs->unsigned_p
2987 && !specs->complex_p
2989 && !specs->thread_p);
2993 /* Construct an array declarator. EXPR is the expression inside [], or
2994 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2995 to the pointer to which a parameter array is converted). STATIC_P is
2996 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2997 is true if the array is [*], a VLA of unspecified length which is
2998 nevertheless a complete type (not currently implemented by GCC),
2999 false otherwise. The field for the contained declarator is left to be
3000 filled in by set_array_declarator_inner. */
3002 struct c_declarator *
3003 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3006 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3007 struct c_declarator);
3008 declarator->kind = cdk_array;
3009 declarator->declarator = 0;
3010 declarator->u.array.dimen = expr;
3013 declarator->u.array.attrs = quals->attrs;
3014 declarator->u.array.quals = quals_from_declspecs (quals);
3018 declarator->u.array.attrs = NULL_TREE;
3019 declarator->u.array.quals = 0;
3021 declarator->u.array.static_p = static_p;
3022 declarator->u.array.vla_unspec_p = vla_unspec_p;
3023 if (pedantic && !flag_isoc99)
3025 if (static_p || quals != NULL)
3026 pedwarn ("ISO C90 does not support %<static%> or type "
3027 "qualifiers in parameter array declarators");
3029 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3032 warning (0, "GCC does not yet properly implement %<[*]%> array declarators");
3036 /* Set the contained declarator of an array declarator. DECL is the
3037 declarator, as constructed by build_array_declarator; INNER is what
3038 appears on the left of the []. ABSTRACT_P is true if it is an
3039 abstract declarator, false otherwise; this is used to reject static
3040 and type qualifiers in abstract declarators, where they are not in
3041 the C99 grammar (subject to possible change in DR#289). */
3043 struct c_declarator *
3044 set_array_declarator_inner (struct c_declarator *decl,
3045 struct c_declarator *inner, bool abstract_p)
3047 decl->declarator = inner;
3048 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
3049 || decl->u.array.attrs != NULL_TREE
3050 || decl->u.array.static_p))
3051 error ("static or type qualifiers in abstract declarator");
3055 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3058 groktypename (struct c_type_name *type_name)
3061 tree attrs = type_name->specs->attrs;
3063 type_name->specs->attrs = NULL_TREE;
3065 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3068 /* Apply attributes. */
3069 decl_attributes (&type, attrs, 0);
3074 /* Decode a declarator in an ordinary declaration or data definition.
3075 This is called as soon as the type information and variable name
3076 have been parsed, before parsing the initializer if any.
3077 Here we create the ..._DECL node, fill in its type,
3078 and put it on the list of decls for the current context.
3079 The ..._DECL node is returned as the value.
3081 Exception: for arrays where the length is not specified,
3082 the type is left null, to be filled in by `finish_decl'.
3084 Function definitions do not come here; they go to start_function
3085 instead. However, external and forward declarations of functions
3086 do go through here. Structure field declarations are done by
3087 grokfield and not through here. */
3090 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3091 bool initialized, tree attributes)
3096 /* An object declared as __attribute__((deprecated)) suppresses
3097 warnings of uses of other deprecated items. */
3098 if (lookup_attribute ("deprecated", attributes))
3099 deprecated_state = DEPRECATED_SUPPRESS;
3101 decl = grokdeclarator (declarator, declspecs,
3102 NORMAL, initialized, NULL);
3106 deprecated_state = DEPRECATED_NORMAL;
3108 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3109 && MAIN_NAME_P (DECL_NAME (decl)))
3110 warning (OPT_Wmain, "%q+D is usually a function", decl);
3113 /* Is it valid for this decl to have an initializer at all?
3114 If not, set INITIALIZED to zero, which will indirectly
3115 tell 'finish_decl' to ignore the initializer once it is parsed. */
3116 switch (TREE_CODE (decl))
3119 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3124 error ("function %qD is initialized like a variable", decl);
3129 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3130 error ("parameter %qD is initialized", decl);
3135 /* Don't allow initializations for incomplete types except for
3136 arrays which might be completed by the initialization. */
3138 /* This can happen if the array size is an undefined macro.
3139 We already gave a warning, so we don't need another one. */
3140 if (TREE_TYPE (decl) == error_mark_node)
3142 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3144 /* A complete type is ok if size is fixed. */
3146 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3147 || C_DECL_VARIABLE_SIZE (decl))
3149 error ("variable-sized object may not be initialized");
3153 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3155 error ("variable %qD has initializer but incomplete type", decl);
3158 else if (C_DECL_VARIABLE_SIZE (decl))
3160 /* Although C99 is unclear about whether incomplete arrays
3161 of VLAs themselves count as VLAs, it does not make
3162 sense to permit them to be initialized given that
3163 ordinary VLAs may not be initialized. */
3164 error ("variable-sized object may not be initialized");
3171 if (current_scope == file_scope)
3172 TREE_STATIC (decl) = 1;
3174 /* Tell 'pushdecl' this is an initialized decl
3175 even though we don't yet have the initializer expression.
3176 Also tell 'finish_decl' it may store the real initializer. */
3177 DECL_INITIAL (decl) = error_mark_node;
3180 /* If this is a function declaration, write a record describing it to the
3181 prototypes file (if requested). */
3183 if (TREE_CODE (decl) == FUNCTION_DECL)
3184 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3186 /* ANSI specifies that a tentative definition which is not merged with
3187 a non-tentative definition behaves exactly like a definition with an
3188 initializer equal to zero. (Section 3.7.2)
3190 -fno-common gives strict ANSI behavior, though this tends to break
3191 a large body of code that grew up without this rule.
3193 Thread-local variables are never common, since there's no entrenched
3194 body of code to break, and it allows more efficient variable references
3195 in the presence of dynamic linking. */
3197 if (TREE_CODE (decl) == VAR_DECL
3199 && TREE_PUBLIC (decl)
3200 && !DECL_THREAD_LOCAL_P (decl)
3202 DECL_COMMON (decl) = 1;
3204 /* Set attributes here so if duplicate decl, will have proper attributes. */
3205 decl_attributes (&decl, attributes, 0);
3207 if (TREE_CODE (decl) == FUNCTION_DECL
3208 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3210 struct c_declarator *ce = declarator;
3212 if (ce->kind == cdk_pointer)
3213 ce = declarator->declarator;
3214 if (ce->kind == cdk_function)
3216 tree args = ce->u.arg_info->parms;
3217 for (; args; args = TREE_CHAIN (args))
3219 tree type = TREE_TYPE (args);
3220 if (type && INTEGRAL_TYPE_P (type)
3221 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3222 DECL_ARG_TYPE (args) = integer_type_node;
3227 if (TREE_CODE (decl) == FUNCTION_DECL
3228 && DECL_DECLARED_INLINE_P (decl)
3229 && DECL_UNINLINABLE (decl)
3230 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3231 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3234 /* Add this decl to the current scope.
3235 TEM may equal DECL or it may be a previous decl of the same name. */
3236 tem = pushdecl (decl);
3238 if (initialized && DECL_EXTERNAL (tem))
3240 DECL_EXTERNAL (tem) = 0;
3241 TREE_STATIC (tem) = 1;
3247 /* Finish processing of a declaration;
3248 install its initial value.
3249 If the length of an array type is not known before,
3250 it must be determined now, from the initial value, or it is an error. */
3253 finish_decl (tree decl, tree init, tree asmspec_tree)
3255 tree type = TREE_TYPE (decl);
3256 int was_incomplete = (DECL_SIZE (decl) == 0);
3257 const char *asmspec = 0;
3259 /* If a name was specified, get the string. */
3260 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3261 && DECL_FILE_SCOPE_P (decl))
3262 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3264 asmspec = TREE_STRING_POINTER (asmspec_tree);
3266 /* If `start_decl' didn't like having an initialization, ignore it now. */
3267 if (init != 0 && DECL_INITIAL (decl) == 0)
3270 /* Don't crash if parm is initialized. */
3271 if (TREE_CODE (decl) == PARM_DECL)
3275 store_init_value (decl, init);
3277 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3278 || TREE_CODE (decl) == FUNCTION_DECL
3279 || TREE_CODE (decl) == FIELD_DECL))
3280 objc_check_decl (decl);
3282 /* Deduce size of array from initialization, if not already known. */
3283 if (TREE_CODE (type) == ARRAY_TYPE
3284 && TYPE_DOMAIN (type) == 0
3285 && TREE_CODE (decl) != TYPE_DECL)
3288 = (TREE_STATIC (decl)
3289 /* Even if pedantic, an external linkage array
3290 may have incomplete type at first. */
3291 ? pedantic && !TREE_PUBLIC (decl)
3292 : !DECL_EXTERNAL (decl));
3294 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3297 /* Get the completed type made by complete_array_type. */
3298 type = TREE_TYPE (decl);
3303 error ("initializer fails to determine size of %q+D", decl);
3308 error ("array size missing in %q+D", decl);
3309 /* If a `static' var's size isn't known,
3310 make it extern as well as static, so it does not get
3312 If it is not `static', then do not mark extern;
3313 finish_incomplete_decl will give it a default size
3314 and it will get allocated. */
3315 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3316 DECL_EXTERNAL (decl) = 1;
3320 error ("zero or negative size array %q+D", decl);
3324 /* For global variables, update the copy of the type that
3325 exists in the binding. */
3326 if (TREE_PUBLIC (decl))
3328 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3329 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3330 b_ext = b_ext->shadowed;
3334 b_ext->type = composite_type (b_ext->type, type);
3345 if (DECL_INITIAL (decl))
3346 TREE_TYPE (DECL_INITIAL (decl)) = type;
3348 layout_decl (decl, 0);
3351 if (TREE_CODE (decl) == VAR_DECL)
3353 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3354 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3355 layout_decl (decl, 0);
3357 if (DECL_SIZE (decl) == 0
3358 /* Don't give an error if we already gave one earlier. */
3359 && TREE_TYPE (decl) != error_mark_node
3360 && (TREE_STATIC (decl)
3361 /* A static variable with an incomplete type
3362 is an error if it is initialized.
3363 Also if it is not file scope.
3364 Otherwise, let it through, but if it is not `extern'
3365 then it may cause an error message later. */
3366 ? (DECL_INITIAL (decl) != 0
3367 || !DECL_FILE_SCOPE_P (decl))
3368 /* An automatic variable with an incomplete type
3370 : !DECL_EXTERNAL (decl)))
3372 error ("storage size of %q+D isn%'t known", decl);
3373 TREE_TYPE (decl) = error_mark_node;
3376 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3377 && DECL_SIZE (decl) != 0)
3379 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3380 constant_expression_warning (DECL_SIZE (decl));
3382 error ("storage size of %q+D isn%'t constant", decl);
3385 if (TREE_USED (type))
3386 TREE_USED (decl) = 1;
3389 /* If this is a function and an assembler name is specified, reset DECL_RTL
3390 so we can give it its new name. Also, update built_in_decls if it
3391 was a normal built-in. */
3392 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3394 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3395 set_builtin_user_assembler_name (decl, asmspec);
3396 set_user_assembler_name (decl, asmspec);
3399 /* If #pragma weak was used, mark the decl weak now. */
3400 maybe_apply_pragma_weak (decl);
3402 /* If this is a variable definition, determine its ELF visibility. */
3403 if (TREE_CODE (decl) == VAR_DECL
3404 && TREE_STATIC (decl)
3405 && !DECL_EXTERNAL (decl))
3406 c_determine_visibility (decl);
3408 /* Output the assembler code and/or RTL code for variables and functions,
3409 unless the type is an undefined structure or union.
3410 If not, it will get done when the type is completed. */
3412 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3414 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3415 if (c_dialect_objc ())
3416 objc_check_decl (decl);
3420 /* If this is not a static variable, issue a warning.
3421 It doesn't make any sense to give an ASMSPEC for an
3422 ordinary, non-register local variable. Historically,
3423 GCC has accepted -- but ignored -- the ASMSPEC in
3425 if (!DECL_FILE_SCOPE_P (decl)
3426 && TREE_CODE (decl) == VAR_DECL
3427 && !C_DECL_REGISTER (decl)
3428 && !TREE_STATIC (decl))
3429 warning (0, "ignoring asm-specifier for non-static local "
3430 "variable %q+D", decl);
3431 else if (C_DECL_REGISTER (decl))
3432 change_decl_assembler_name (decl, get_identifier (asmspec));
3434 set_user_assembler_name (decl, asmspec);
3437 if (DECL_FILE_SCOPE_P (decl))
3439 if (DECL_INITIAL (decl) == NULL_TREE
3440 || DECL_INITIAL (decl) == error_mark_node)
3441 /* Don't output anything
3442 when a tentative file-scope definition is seen.
3443 But at end of compilation, do output code for them. */
3444 DECL_DEFER_OUTPUT (decl) = 1;
3445 rest_of_decl_compilation (decl, true, 0);
3449 /* In conjunction with an ASMSPEC, the `register'
3450 keyword indicates that we should place the variable
3451 in a particular register. */
3452 if (asmspec && C_DECL_REGISTER (decl))
3454 DECL_HARD_REGISTER (decl) = 1;
3455 /* This cannot be done for a structure with volatile
3456 fields, on which DECL_REGISTER will have been
3458 if (!DECL_REGISTER (decl))
3459 error ("cannot put object with volatile field into register");
3462 if (TREE_CODE (decl) != FUNCTION_DECL)
3464 /* If we're building a variable sized type, and we might be
3465 reachable other than via the top of the current binding
3466 level, then create a new BIND_EXPR so that we deallocate
3467 the object at the right time. */
3468 /* Note that DECL_SIZE can be null due to errors. */
3469 if (DECL_SIZE (decl)
3470 && !TREE_CONSTANT (DECL_SIZE (decl))
3471 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3474 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3475 TREE_SIDE_EFFECTS (bind) = 1;
3477 BIND_EXPR_BODY (bind) = push_stmt_list ();
3479 add_stmt (build_stmt (DECL_EXPR, decl));
3484 if (!DECL_FILE_SCOPE_P (decl))
3486 /* Recompute the RTL of a local array now
3487 if it used to be an incomplete type. */
3489 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3491 /* If we used it already as memory, it must stay in memory. */
3492 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3493 /* If it's still incomplete now, no init will save it. */
3494 if (DECL_SIZE (decl) == 0)
3495 DECL_INITIAL (decl) = 0;
3500 /* If this was marked 'used', be sure it will be output. */
3501 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3502 mark_decl_referenced (decl);
3504 if (TREE_CODE (decl) == TYPE_DECL)
3506 if (!DECL_FILE_SCOPE_P (decl)
3507 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3508 add_stmt (build_stmt (DECL_EXPR, decl));
3510 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3513 /* At the end of a declaration, throw away any variable type sizes
3514 of types defined inside that declaration. There is no use
3515 computing them in the following function definition. */
3516 if (current_scope == file_scope)
3517 get_pending_sizes ();
3519 /* Install a cleanup (aka destructor) if one was given. */
3520 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3522 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3525 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3526 tree cleanup_decl = lookup_name (cleanup_id);
3529 /* Build "cleanup(&decl)" for the destructor. */
3530 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3531 cleanup = build_tree_list (NULL_TREE, cleanup);
3532 cleanup = build_function_call (cleanup_decl, cleanup);
3534 /* Don't warn about decl unused; the cleanup uses it. */
3535 TREE_USED (decl) = 1;
3536 TREE_USED (cleanup_decl) = 1;
3538 /* Initialize EH, if we've been told to do so. */
3539 if (flag_exceptions && !c_eh_initialized_p)
3541 c_eh_initialized_p = true;
3542 eh_personality_libfunc
3543 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3544 ? "__gcc_personality_sj0"
3545 : "__gcc_personality_v0");
3546 default_init_unwind_resume_libfunc ();
3547 using_eh_for_cleanups ();
3550 push_cleanup (decl, cleanup, false);
3555 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3558 grokparm (const struct c_parm *parm)
3560 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3563 decl_attributes (&decl, parm->attrs, 0);
3568 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3569 and push that on the current scope. */
3572 push_parm_decl (const struct c_parm *parm)
3576 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3577 decl_attributes (&decl, parm->attrs, 0);
3579 decl = pushdecl (decl);
3581 finish_decl (decl, NULL_TREE, NULL_TREE);
3584 /* Mark all the parameter declarations to date as forward decls.
3585 Also diagnose use of this extension. */
3588 mark_forward_parm_decls (void)
3590 struct c_binding *b;
3592 if (pedantic && !current_scope->warned_forward_parm_decls)
3594 pedwarn ("ISO C forbids forward parameter declarations");
3595 current_scope->warned_forward_parm_decls = true;
3598 for (b = current_scope->bindings; b; b = b->prev)
3599 if (TREE_CODE (b->decl) == PARM_DECL)
3600 TREE_ASM_WRITTEN (b->decl) = 1;
3603 static GTY(()) int compound_literal_number;
3605 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3606 literal, which may be an incomplete array type completed by the
3607 initializer; INIT is a CONSTRUCTOR that initializes the compound
3611 build_compound_literal (tree type, tree init)
3613 /* We do not use start_decl here because we have a type, not a declarator;
3614 and do not use finish_decl because the decl should be stored inside
3615 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3620 if (type == error_mark_node)
3621 return error_mark_node;
3623 decl = build_decl (VAR_DECL, NULL_TREE, type);
3624 DECL_EXTERNAL (decl) = 0;
3625 TREE_PUBLIC (decl) = 0;
3626 TREE_STATIC (decl) = (current_scope == file_scope);
3627 DECL_CONTEXT (decl) = current_function_decl;
3628 TREE_USED (decl) = 1;
3629 TREE_TYPE (decl) = type;
3630 TREE_READONLY (decl) = TYPE_READONLY (type);
3631 store_init_value (decl, init);
3633 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3635 int failure = complete_array_type (&TREE_TYPE (decl),
3636 DECL_INITIAL (decl), true);
3637 gcc_assert (!failure);
3639 type = TREE_TYPE (decl);
3640 TREE_TYPE (DECL_INITIAL (decl)) = type;
3643 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3644 return error_mark_node;
3646 stmt = build_stmt (DECL_EXPR, decl);
3647 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3648 TREE_SIDE_EFFECTS (complit) = 1;
3650 layout_decl (decl, 0);
3652 if (TREE_STATIC (decl))
3654 /* This decl needs a name for the assembler output. We also need
3655 a unique suffix to be added to the name. */
3658 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3659 compound_literal_number);
3660 compound_literal_number++;
3661 DECL_NAME (decl) = get_identifier (name);
3662 DECL_DEFER_OUTPUT (decl) = 1;
3663 DECL_COMDAT (decl) = 1;
3664 DECL_ARTIFICIAL (decl) = 1;
3665 DECL_IGNORED_P (decl) = 1;
3667 rest_of_decl_compilation (decl, 1, 0);
3673 /* Determine whether TYPE is a structure with a flexible array member,
3674 or a union containing such a structure (possibly recursively). */
3677 flexible_array_type_p (tree type)
3680 switch (TREE_CODE (type))
3683 x = TYPE_FIELDS (type);
3686 while (TREE_CHAIN (x) != NULL_TREE)
3688 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3689 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3690 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3691 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3695 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3697 if (flexible_array_type_p (TREE_TYPE (x)))
3706 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3707 replacing with appropriate values if they are invalid. */
3709 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3712 unsigned int max_width;
3713 unsigned HOST_WIDE_INT w;
3714 const char *name = orig_name ? orig_name: _("<anonymous>");
3716 /* Detect and ignore out of range field width and process valid
3718 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3719 || TREE_CODE (*width) != INTEGER_CST)
3721 error ("bit-field %qs width not an integer constant", name);
3722 *width = integer_one_node;
3726 constant_expression_warning (*width);
3727 if (tree_int_cst_sgn (*width) < 0)
3729 error ("negative width in bit-field %qs", name);
3730 *width = integer_one_node;
3732 else if (integer_zerop (*width) && orig_name)
3734 error ("zero width for bit-field %qs", name);
3735 *width = integer_one_node;
3739 /* Detect invalid bit-field type. */
3740 if (TREE_CODE (*type) != INTEGER_TYPE
3741 && TREE_CODE (*type) != BOOLEAN_TYPE
3742 && TREE_CODE (*type) != ENUMERAL_TYPE)
3744 error ("bit-field %qs has invalid type", name);
3745 *type = unsigned_type_node;
3748 type_mv = TYPE_MAIN_VARIANT (*type);
3750 && type_mv != integer_type_node
3751 && type_mv != unsigned_type_node
3752 && type_mv != boolean_type_node)
3753 pedwarn ("type of bit-field %qs is a GCC extension", name);
3755 if (type_mv == boolean_type_node)
3756 max_width = CHAR_TYPE_SIZE;
3758 max_width = TYPE_PRECISION (*type);
3760 if (0 < compare_tree_int (*width, max_width))
3762 error ("width of %qs exceeds its type", name);
3764 *width = build_int_cst (NULL_TREE, w);
3767 w = tree_low_cst (*width, 1);
3769 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3771 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3773 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3774 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3775 warning (0, "%qs is narrower than values of its type", name);
3779 /* Build a bit-field integer type for the given WIDTH and UNSIGNEDP. */
3781 c_build_bitfield_integer_type (unsigned HOST_WIDE_INT width, int unsignedp)
3783 /* Extended integer types of the same width as a standard type have
3784 lesser rank, so those of the same width as int promote to int or
3785 unsigned int and are valid for printf formats expecting int or
3786 unsigned int. To avoid such special cases, avoid creating
3787 extended integer types for bit-fields if a standard integer type
3789 if (width == TYPE_PRECISION (integer_type_node))
3790 return unsignedp ? unsigned_type_node : integer_type_node;
3791 if (width == TYPE_PRECISION (signed_char_type_node))
3792 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3793 if (width == TYPE_PRECISION (short_integer_type_node))
3794 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3795 if (width == TYPE_PRECISION (long_integer_type_node))
3796 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3797 if (width == TYPE_PRECISION (long_long_integer_type_node))
3798 return (unsignedp ? long_long_unsigned_type_node
3799 : long_long_integer_type_node);
3800 return build_nonstandard_integer_type (width, unsignedp);
3803 /* Given declspecs and a declarator,
3804 determine the name and type of the object declared
3805 and construct a ..._DECL node for it.
3806 (In one case we can return a ..._TYPE node instead.
3807 For invalid input we sometimes return 0.)
3809 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3811 DECL_CONTEXT says which syntactic context this declaration is in:
3812 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3813 FUNCDEF for a function definition. Like NORMAL but a few different
3814 error messages in each case. Return value may be zero meaning
3815 this definition is too screwy to try to parse.
3816 PARM for a parameter declaration (either within a function prototype
3817 or before a function body). Make a PARM_DECL, or return void_type_node.
3818 TYPENAME if for a typename (in a cast or sizeof).
3819 Don't make a DECL node; just return the ..._TYPE node.
3820 FIELD for a struct or union field; make a FIELD_DECL.
3821 INITIALIZED is true if the decl has an initializer.
3822 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3823 representing the width of the bit-field.
3825 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3826 It may also be so in the PARM case, for a prototype where the
3827 argument type is specified but not the name.
3829 This function is where the complicated C meanings of `static'
3830 and `extern' are interpreted. */
3833 grokdeclarator (const struct c_declarator *declarator,
3834 struct c_declspecs *declspecs,
3835 enum decl_context decl_context, bool initialized, tree *width)
3837 tree type = declspecs->type;
3838 bool threadp = declspecs->thread_p;
3839 enum c_storage_class storage_class = declspecs->storage_class;
3843 int type_quals = TYPE_UNQUALIFIED;
3844 const char *name, *orig_name;
3845 tree typedef_type = 0;
3846 int funcdef_flag = 0;
3847 bool funcdef_syntax = false;
3848 int size_varies = 0;
3849 tree decl_attr = declspecs->decl_attr;
3850 int array_ptr_quals = TYPE_UNQUALIFIED;
3851 tree array_ptr_attrs = NULL_TREE;
3852 int array_parm_static = 0;
3853 tree returned_attrs = NULL_TREE;
3854 bool bitfield = width != NULL;
3856 struct c_arg_info *arg_info = 0;
3858 if (decl_context == FUNCDEF)
3859 funcdef_flag = 1, decl_context = NORMAL;
3861 /* Look inside a declarator for the name being declared
3862 and get it as a string, for an error message. */
3864 const struct c_declarator *decl = declarator;
3873 funcdef_syntax = (decl->kind == cdk_function);
3874 decl = decl->declarator;
3878 decl = decl->declarator;
3883 name = IDENTIFIER_POINTER (decl->u.id);
3895 /* A function definition's declarator must have the form of
3896 a function declarator. */
3898 if (funcdef_flag && !funcdef_syntax)
3901 /* If this looks like a function definition, make it one,
3902 even if it occurs where parms are expected.
3903 Then store_parm_decls will reject it and not use it as a parm. */
3904 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3905 decl_context = PARM;
3907 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3908 warn_deprecated_use (declspecs->type);
3910 typedef_type = type;
3911 size_varies = C_TYPE_VARIABLE_SIZE (type);
3913 /* Diagnose defaulting to "int". */
3915 if (declspecs->default_int_p && !in_system_header)
3917 /* Issue a warning if this is an ISO C 99 program or if
3918 -Wreturn-type and this is a function, or if -Wimplicit;
3919 prefer the former warning since it is more explicit. */
3920 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3922 warn_about_return_type = 1;
3923 else if (warn_implicit_int || flag_isoc99)
3924 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3927 /* Adjust the type if a bit-field is being declared,
3928 -funsigned-bitfields applied and the type is not explicitly
3930 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
3931 && TREE_CODE (type) == INTEGER_TYPE)
3932 type = c_common_unsigned_type (type);
3934 /* Figure out the type qualifiers for the declaration. There are
3935 two ways a declaration can become qualified. One is something
3936 like `const int i' where the `const' is explicit. Another is
3937 something like `typedef const int CI; CI i' where the type of the
3938 declaration contains the `const'. A third possibility is that
3939 there is a type qualifier on the element type of a typedefed
3940 array type, in which case we should extract that qualifier so
3941 that c_apply_type_quals_to_decls receives the full list of
3942 qualifiers to work with (C90 is not entirely clear about whether
3943 duplicate qualifiers should be diagnosed in this case, but it
3944 seems most appropriate to do so). */
3945 element_type = strip_array_types (type);
3946 constp = declspecs->const_p + TYPE_READONLY (element_type);
3947 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
3948 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
3949 if (pedantic && !flag_isoc99)
3952 pedwarn ("duplicate %<const%>");
3954 pedwarn ("duplicate %<restrict%>");
3956 pedwarn ("duplicate %<volatile%>");
3958 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
3959 type = TYPE_MAIN_VARIANT (type);
3960 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3961 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3962 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3964 /* Warn about storage classes that are invalid for certain
3965 kinds of declarations (parameters, typenames, etc.). */
3969 || storage_class == csc_auto
3970 || storage_class == csc_register
3971 || storage_class == csc_typedef))
3973 if (storage_class == csc_auto
3974 && (pedantic || current_scope == file_scope))
3975 pedwarn ("function definition declared %<auto%>");
3976 if (storage_class == csc_register)
3977 error ("function definition declared %<register%>");
3978 if (storage_class == csc_typedef)
3979 error ("function definition declared %<typedef%>");
3981 error ("function definition declared %<__thread%>");
3983 if (storage_class == csc_auto
3984 || storage_class == csc_register
3985 || storage_class == csc_typedef)
3986 storage_class = csc_none;
3988 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
3990 if (decl_context == PARM && storage_class == csc_register)
3994 switch (decl_context)
3997 error ("storage class specified for structure field %qs",
4001 error ("storage class specified for parameter %qs", name);
4004 error ("storage class specified for typename");
4007 storage_class = csc_none;
4011 else if (storage_class == csc_extern
4015 /* 'extern' with initialization is invalid if not at file scope. */
4016 if (current_scope == file_scope)
4017 warning (0, "%qs initialized and declared %<extern%>", name);
4019 error ("%qs has both %<extern%> and initializer", name);
4021 else if (current_scope == file_scope)
4023 if (storage_class == csc_auto)
4024 error ("file-scope declaration of %qs specifies %<auto%>", name);
4025 if (pedantic && storage_class == csc_register)
4026 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
4030 if (storage_class == csc_extern && funcdef_flag)
4031 error ("nested function %qs declared %<extern%>", name);
4032 else if (threadp && storage_class == csc_none)
4034 error ("function-scope %qs implicitly auto and declared "
4041 /* Now figure out the structure of the declarator proper.
4042 Descend through it, creating more complex types, until we reach
4043 the declared identifier (or NULL_TREE, in an absolute declarator).
4044 At each stage we maintain an unqualified version of the type
4045 together with any qualifiers that should be applied to it with
4046 c_build_qualified_type; this way, array types including
4047 multidimensional array types are first built up in unqualified
4048 form and then the qualified form is created with
4049 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4051 while (declarator && declarator->kind != cdk_id)
4053 if (type == error_mark_node)
4055 declarator = declarator->declarator;
4059 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4060 a cdk_pointer (for *...),
4061 a cdk_function (for ...(...)),
4062 a cdk_attrs (for nested attributes),
4063 or a cdk_id (for the name being declared
4064 or the place in an absolute declarator
4065 where the name was omitted).
4066 For the last case, we have just exited the loop.
4068 At this point, TYPE is the type of elements of an array,
4069 or for a function to return, or for a pointer to point to.
4070 After this sequence of ifs, TYPE is the type of the
4071 array or function or pointer, and DECLARATOR has had its
4072 outermost layer removed. */
4074 if (array_ptr_quals != TYPE_UNQUALIFIED
4075 || array_ptr_attrs != NULL_TREE
4076 || array_parm_static)
4078 /* Only the innermost declarator (making a parameter be of
4079 array type which is converted to pointer type)
4080 may have static or type qualifiers. */
4081 error ("static or type qualifiers in non-parameter array declarator");
4082 array_ptr_quals = TYPE_UNQUALIFIED;
4083 array_ptr_attrs = NULL_TREE;
4084 array_parm_static = 0;
4087 switch (declarator->kind)
4091 /* A declarator with embedded attributes. */
4092 tree attrs = declarator->u.attrs;
4093 const struct c_declarator *inner_decl;
4095 declarator = declarator->declarator;
4096 inner_decl = declarator;
4097 while (inner_decl->kind == cdk_attrs)
4098 inner_decl = inner_decl->declarator;
4099 if (inner_decl->kind == cdk_id)
4100 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4101 else if (inner_decl->kind == cdk_function)
4102 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4103 else if (inner_decl->kind == cdk_array)
4104 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4105 returned_attrs = decl_attributes (&type,
4106 chainon (returned_attrs, attrs),
4112 tree itype = NULL_TREE;
4113 tree size = declarator->u.array.dimen;
4114 /* The index is a signed object `sizetype' bits wide. */
4115 tree index_type = c_common_signed_type (sizetype);
4117 array_ptr_quals = declarator->u.array.quals;
4118 array_ptr_attrs = declarator->u.array.attrs;
4119 array_parm_static = declarator->u.array.static_p;
4121 declarator = declarator->declarator;
4123 /* Check for some types that there cannot be arrays of. */
4125 if (VOID_TYPE_P (type))
4127 error ("declaration of %qs as array of voids", name);
4128 type = error_mark_node;
4131 if (TREE_CODE (type) == FUNCTION_TYPE)
4133 error ("declaration of %qs as array of functions", name);
4134 type = error_mark_node;
4137 if (pedantic && !in_system_header && flexible_array_type_p (type))
4138 pedwarn ("invalid use of structure with flexible array member");
4140 if (size == error_mark_node)
4141 type = error_mark_node;
4143 if (type == error_mark_node)
4146 /* If size was specified, set ITYPE to a range-type for
4147 that size. Otherwise, ITYPE remains null. finish_decl
4148 may figure it out from an initial value. */
4152 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4154 STRIP_TYPE_NOPS (size);
4156 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4158 error ("size of array %qs has non-integer type", name);
4159 size = integer_one_node;
4162 if (pedantic && integer_zerop (size))
4163 pedwarn ("ISO C forbids zero-size array %qs", name);
4165 if (TREE_CODE (size) == INTEGER_CST)
4167 constant_expression_warning (size);
4168 if (tree_int_cst_sgn (size) < 0)
4170 error ("size of array %qs is negative", name);
4171 size = integer_one_node;
4176 /* Make sure the array size remains visibly
4177 nonconstant even if it is (eg) a const variable
4178 with known value. */
4181 if (!flag_isoc99 && pedantic)
4183 if (TREE_CONSTANT (size))
4184 pedwarn ("ISO C90 forbids array %qs whose size "
4185 "can%'t be evaluated",
4188 pedwarn ("ISO C90 forbids variable-size array %qs",
4193 if (integer_zerop (size))
4195 /* A zero-length array cannot be represented with
4196 an unsigned index type, which is what we'll
4197 get with build_index_type. Create an
4198 open-ended range instead. */
4199 itype = build_range_type (sizetype, size, NULL_TREE);
4203 /* Arrange for the SAVE_EXPR on the inside of the
4204 MINUS_EXPR, which allows the -1 to get folded
4205 with the +1 that happens when building TYPE_SIZE. */
4207 size = variable_size (size);
4209 /* Compute the maximum valid index, that is, size
4210 - 1. Do the calculation in index_type, so that
4211 if it is a variable the computations will be
4212 done in the proper mode. */
4213 itype = fold_build2 (MINUS_EXPR, index_type,
4214 convert (index_type, size),
4215 convert (index_type,
4218 /* If that overflowed, the array is too big. ???
4219 While a size of INT_MAX+1 technically shouldn't
4220 cause an overflow (because we subtract 1), the
4221 overflow is recorded during the conversion to
4222 index_type, before the subtraction. Handling
4223 this case seems like an unnecessary
4225 if (TREE_CODE (itype) == INTEGER_CST
4226 && TREE_OVERFLOW (itype))
4228 error ("size of array %qs is too large", name);
4229 type = error_mark_node;
4233 itype = build_index_type (itype);
4236 else if (decl_context == FIELD)
4238 if (pedantic && !flag_isoc99 && !in_system_header)
4239 pedwarn ("ISO C90 does not support flexible array members");
4241 /* ISO C99 Flexible array members are effectively
4242 identical to GCC's zero-length array extension. */
4243 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4246 /* Complain about arrays of incomplete types. */
4247 if (!COMPLETE_TYPE_P (type))
4249 error ("array type has incomplete element type");
4250 type = error_mark_node;
4253 type = build_array_type (type, itype);
4256 C_TYPE_VARIABLE_SIZE (type) = 1;
4258 /* The GCC extension for zero-length arrays differs from
4259 ISO flexible array members in that sizeof yields
4261 if (size && integer_zerop (size))
4263 TYPE_SIZE (type) = bitsize_zero_node;
4264 TYPE_SIZE_UNIT (type) = size_zero_node;
4267 if (decl_context != PARM
4268 && (array_ptr_quals != TYPE_UNQUALIFIED
4269 || array_ptr_attrs != NULL_TREE
4270 || array_parm_static))
4272 error ("static or type qualifiers in non-parameter array declarator");
4273 array_ptr_quals = TYPE_UNQUALIFIED;
4274 array_ptr_attrs = NULL_TREE;
4275 array_parm_static = 0;
4281 /* Say it's a definition only for the declarator closest
4282 to the identifier, apart possibly from some
4284 bool really_funcdef = false;
4288 const struct c_declarator *t = declarator->declarator;
4289 while (t->kind == cdk_attrs)
4291 really_funcdef = (t->kind == cdk_id);
4294 /* Declaring a function type. Make sure we have a valid
4295 type for the function to return. */
4296 if (type == error_mark_node)
4301 /* Warn about some types functions can't return. */
4302 if (TREE_CODE (type) == FUNCTION_TYPE)
4304 error ("%qs declared as function returning a function", name);
4305 type = integer_type_node;
4307 if (TREE_CODE (type) == ARRAY_TYPE)
4309 error ("%qs declared as function returning an array", name);
4310 type = integer_type_node;
4313 /* Construct the function type and go to the next
4314 inner layer of declarator. */
4315 arg_info = declarator->u.arg_info;
4316 arg_types = grokparms (arg_info, really_funcdef);
4318 /* Type qualifiers before the return type of the function
4319 qualify the return type, not the function type. */
4322 /* Type qualifiers on a function return type are
4323 normally permitted by the standard but have no
4324 effect, so give a warning at -Wreturn-type.
4325 Qualifiers on a void return type are banned on
4326 function definitions in ISO C; GCC used to used
4327 them for noreturn functions. */
4328 if (VOID_TYPE_P (type) && really_funcdef)
4329 pedwarn ("function definition has qualified void return type");
4331 warning (OPT_Wreturn_type,
4332 "type qualifiers ignored on function return type");
4334 type = c_build_qualified_type (type, type_quals);
4336 type_quals = TYPE_UNQUALIFIED;
4338 type = build_function_type (type, arg_types);
4339 declarator = declarator->declarator;
4341 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4342 the formal parameter list of this FUNCTION_TYPE to point to
4343 the FUNCTION_TYPE node itself. */
4347 for (link = arg_info->tags;
4349 link = TREE_CHAIN (link))
4350 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4356 /* Merge any constancy or volatility into the target type
4359 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4361 pedwarn ("ISO C forbids qualified function types");
4363 type = c_build_qualified_type (type, type_quals);
4366 type = build_pointer_type (type);
4368 /* Process type qualifiers (such as const or volatile)
4369 that were given inside the `*'. */
4370 type_quals = declarator->u.pointer_quals;
4372 declarator = declarator->declarator;
4380 /* Now TYPE has the actual type, apart from any qualifiers in
4383 /* Check the type and width of a bit-field. */
4385 check_bitfield_type_and_width (&type, width, orig_name);
4387 /* Did array size calculations overflow? */
4389 if (TREE_CODE (type) == ARRAY_TYPE
4390 && COMPLETE_TYPE_P (type)
4391 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST
4392 && TREE_OVERFLOW (TYPE_SIZE (type)))
4394 error ("size of array %qs is too large", name);
4395 /* If we proceed with the array type as it is, we'll eventually
4396 crash in tree_low_cst(). */
4397 type = error_mark_node;
4400 /* If this is declaring a typedef name, return a TYPE_DECL. */
4402 if (storage_class == csc_typedef)
4405 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4407 pedwarn ("ISO C forbids qualified function types");
4409 type = c_build_qualified_type (type, type_quals);
4410 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4411 if (declspecs->explicit_signed_p)
4412 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4413 decl_attributes (&decl, returned_attrs, 0);
4414 if (declspecs->inline_p)
4415 pedwarn ("typedef %q+D declared %<inline%>", decl);
4419 /* Detect the case of an array type of unspecified size
4420 which came, as such, direct from a typedef name.
4421 We must copy the type, so that each identifier gets
4422 a distinct type, so that each identifier's size can be
4423 controlled separately by its own initializer. */
4425 if (type != 0 && typedef_type != 0
4426 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4427 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4429 type = build_array_type (TREE_TYPE (type), 0);
4431 C_TYPE_VARIABLE_SIZE (type) = 1;
4434 /* If this is a type name (such as, in a cast or sizeof),
4435 compute the type and return it now. */
4437 if (decl_context == TYPENAME)
4439 /* Note that the grammar rejects storage classes in typenames
4441 gcc_assert (storage_class == csc_none && !threadp
4442 && !declspecs->inline_p);
4443 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4445 pedwarn ("ISO C forbids const or volatile function types");
4447 type = c_build_qualified_type (type, type_quals);
4448 decl_attributes (&type, returned_attrs, 0);
4452 /* Aside from typedefs and type names (handle above),
4453 `void' at top level (not within pointer)
4454 is allowed only in public variables.
4455 We don't complain about parms either, but that is because
4456 a better error message can be made later. */
4458 if (VOID_TYPE_P (type) && decl_context != PARM
4459 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4460 && (storage_class == csc_extern
4461 || (current_scope == file_scope
4462 && !(storage_class == csc_static
4463 || storage_class == csc_register)))))
4465 error ("variable or field %qs declared void", name);
4466 type = integer_type_node;
4469 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4470 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4475 if (decl_context == PARM)
4477 tree type_as_written;
4480 /* A parameter declared as an array of T is really a pointer to T.
4481 One declared as a function is really a pointer to a function. */
4483 if (TREE_CODE (type) == ARRAY_TYPE)
4485 /* Transfer const-ness of array into that of type pointed to. */
4486 type = TREE_TYPE (type);
4488 type = c_build_qualified_type (type, type_quals);
4489 type = build_pointer_type (type);
4490 type_quals = array_ptr_quals;
4492 /* We don't yet implement attributes in this context. */
4493 if (array_ptr_attrs != NULL_TREE)
4494 warning (OPT_Wattributes,
4495 "attributes in parameter array declarator ignored");
4499 else if (TREE_CODE (type) == FUNCTION_TYPE)
4501 if (pedantic && type_quals)
4502 pedwarn ("ISO C forbids qualified function types");
4504 type = c_build_qualified_type (type, type_quals);
4505 type = build_pointer_type (type);
4506 type_quals = TYPE_UNQUALIFIED;
4508 else if (type_quals)
4509 type = c_build_qualified_type (type, type_quals);
4511 type_as_written = type;
4513 decl = build_decl (PARM_DECL, declarator->u.id, type);
4515 C_DECL_VARIABLE_SIZE (decl) = 1;
4517 /* Compute the type actually passed in the parmlist,
4518 for the case where there is no prototype.
4519 (For example, shorts and chars are passed as ints.)
4520 When there is a prototype, this is overridden later. */
4522 if (type == error_mark_node)
4523 promoted_type = type;
4525 promoted_type = c_type_promotes_to (type);
4527 DECL_ARG_TYPE (decl) = promoted_type;
4528 if (declspecs->inline_p)
4529 pedwarn ("parameter %q+D declared %<inline%>", decl);
4531 else if (decl_context == FIELD)
4533 /* Note that the grammar rejects storage classes in typenames
4535 gcc_assert (storage_class == csc_none && !threadp
4536 && !declspecs->inline_p);
4538 /* Structure field. It may not be a function. */
4540 if (TREE_CODE (type) == FUNCTION_TYPE)
4542 error ("field %qs declared as a function", name);
4543 type = build_pointer_type (type);
4545 else if (TREE_CODE (type) != ERROR_MARK
4546 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4548 error ("field %qs has incomplete type", name);
4549 type = error_mark_node;
4551 type = c_build_qualified_type (type, type_quals);
4552 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4553 DECL_NONADDRESSABLE_P (decl) = bitfield;
4556 C_DECL_VARIABLE_SIZE (decl) = 1;
4558 else if (TREE_CODE (type) == FUNCTION_TYPE)
4560 if (storage_class == csc_register || threadp)
4562 error ("invalid storage class for function %qs", name);
4564 else if (current_scope != file_scope)
4566 /* Function declaration not at file scope. Storage
4567 classes other than `extern' are not allowed, C99
4568 6.7.1p5, and `extern' makes no difference. However,
4569 GCC allows 'auto', perhaps with 'inline', to support
4570 nested functions. */
4571 if (storage_class == csc_auto)
4574 pedwarn ("invalid storage class for function %qs", name);
4576 else if (storage_class == csc_static)
4578 error ("invalid storage class for function %qs", name);
4580 storage_class = declspecs->storage_class = csc_none;
4586 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4587 decl = build_decl_attribute_variant (decl, decl_attr);
4589 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4591 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4592 pedwarn ("ISO C forbids qualified function types");
4594 /* GNU C interprets a volatile-qualified function type to indicate
4595 that the function does not return. */
4596 if ((type_quals & TYPE_QUAL_VOLATILE)
4597 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4598 warning (0, "%<noreturn%> function returns non-void value");
4600 /* Every function declaration is an external reference
4601 (DECL_EXTERNAL) except for those which are not at file
4602 scope and are explicitly declared "auto". This is
4603 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4604 GCC to signify a forward declaration of a nested function. */
4605 if (storage_class == csc_auto && current_scope != file_scope)
4606 DECL_EXTERNAL (decl) = 0;
4608 DECL_EXTERNAL (decl) = 1;
4610 /* Record absence of global scope for `static' or `auto'. */
4612 = !(storage_class == csc_static || storage_class == csc_auto);
4614 /* For a function definition, record the argument information
4615 block where store_parm_decls will look for it. */
4617 current_function_arg_info = arg_info;
4619 if (declspecs->default_int_p)
4620 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4622 /* Record presence of `inline', if it is reasonable. */
4623 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4625 if (declspecs->inline_p)
4626 pedwarn ("cannot inline function %<main%>");
4628 else if (declspecs->inline_p)
4630 /* Record that the function is declared `inline'. */
4631 DECL_DECLARED_INLINE_P (decl) = 1;
4633 /* Do not mark bare declarations as DECL_INLINE. Doing so
4634 in the presence of multiple declarations can result in
4635 the abstract origin pointing between the declarations,
4636 which will confuse dwarf2out. */
4639 DECL_INLINE (decl) = 1;
4640 if (storage_class == csc_extern)
4641 current_extern_inline = 1;
4644 /* If -finline-functions, assume it can be inlined. This does
4645 two things: let the function be deferred until it is actually
4646 needed, and let dwarf2 know that the function is inlinable. */
4647 else if (flag_inline_trees == 2 && initialized)
4648 DECL_INLINE (decl) = 1;
4652 /* It's a variable. */
4653 /* An uninitialized decl with `extern' is a reference. */
4654 int extern_ref = !initialized && storage_class == csc_extern;
4656 type = c_build_qualified_type (type, type_quals);
4658 /* C99 6.2.2p7: It is invalid (compile-time undefined
4659 behavior) to create an 'extern' declaration for a
4660 variable if there is a global declaration that is
4661 'static' and the global declaration is not visible.
4662 (If the static declaration _is_ currently visible,
4663 the 'extern' declaration is taken to refer to that decl.) */
4664 if (extern_ref && current_scope != file_scope)
4666 tree global_decl = identifier_global_value (declarator->u.id);
4667 tree visible_decl = lookup_name (declarator->u.id);
4670 && global_decl != visible_decl
4671 && TREE_CODE (global_decl) == VAR_DECL
4672 && !TREE_PUBLIC (global_decl))
4673 error ("variable previously declared %<static%> redeclared "
4677 decl = build_decl (VAR_DECL, declarator->u.id, type);
4678 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4680 C_DECL_VARIABLE_SIZE (decl) = 1;
4682 if (declspecs->inline_p)
4683 pedwarn ("variable %q+D declared %<inline%>", decl);
4685 /* At file scope, an initialized extern declaration may follow
4686 a static declaration. In that case, DECL_EXTERNAL will be
4687 reset later in start_decl. */
4688 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4690 /* At file scope, the presence of a `static' or `register' storage
4691 class specifier, or the absence of all storage class specifiers
4692 makes this declaration a definition (perhaps tentative). Also,
4693 the absence of both `static' and `register' makes it public. */
4694 if (current_scope == file_scope)
4696 TREE_PUBLIC (decl) = !(storage_class == csc_static
4697 || storage_class == csc_register);
4698 TREE_STATIC (decl) = !extern_ref;
4700 /* Not at file scope, only `static' makes a static definition. */
4703 TREE_STATIC (decl) = (storage_class == csc_static);
4704 TREE_PUBLIC (decl) = extern_ref;
4709 if (targetm.have_tls)
4710 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4712 /* A mere warning is sure to result in improper semantics
4713 at runtime. Don't bother to allow this to compile. */
4714 error ("thread-local storage not supported for this target");
4718 /* Record `register' declaration for warnings on &
4719 and in case doing stupid register allocation. */
4721 if (storage_class == csc_register)
4723 C_DECL_REGISTER (decl) = 1;
4724 DECL_REGISTER (decl) = 1;
4727 /* Record constancy and volatility. */
4728 c_apply_type_quals_to_decl (type_quals, decl);
4730 /* If a type has volatile components, it should be stored in memory.
4731 Otherwise, the fact that those components are volatile
4732 will be ignored, and would even crash the compiler.
4733 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4734 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4735 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4736 || TREE_CODE (decl) == RESULT_DECL))
4738 /* It is not an error for a structure with volatile fields to
4739 be declared register, but reset DECL_REGISTER since it
4740 cannot actually go in a register. */
4741 int was_reg = C_DECL_REGISTER (decl);
4742 C_DECL_REGISTER (decl) = 0;
4743 DECL_REGISTER (decl) = 0;
4744 c_mark_addressable (decl);
4745 C_DECL_REGISTER (decl) = was_reg;
4748 /* This is the earliest point at which we might know the assembler
4749 name of a variable. Thus, if it's known before this, die horribly. */
4750 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4752 decl_attributes (&decl, returned_attrs, 0);
4758 /* Decode the parameter-list info for a function type or function definition.
4759 The argument is the value returned by `get_parm_info' (or made in parse.y
4760 if there is an identifier list instead of a parameter decl list).
4761 These two functions are separate because when a function returns
4762 or receives functions then each is called multiple times but the order
4763 of calls is different. The last call to `grokparms' is always the one
4764 that contains the formal parameter names of a function definition.
4766 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4768 FUNCDEF_FLAG is true for a function definition, false for
4769 a mere declaration. A nonempty identifier-list gets an error message
4770 when FUNCDEF_FLAG is false. */
4773 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4775 tree arg_types = arg_info->types;
4777 if (arg_types == 0 && !funcdef_flag && !in_system_header)
4778 warning (OPT_Wstrict_prototypes,
4779 "function declaration isn%'t a prototype");
4781 if (arg_types == error_mark_node)
4782 return 0; /* don't set TYPE_ARG_TYPES in this case */
4784 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4787 pedwarn ("parameter names (without types) in function declaration");
4789 arg_info->parms = arg_info->types;
4790 arg_info->types = 0;
4795 tree parm, type, typelt;
4796 unsigned int parmno;
4798 /* If there is a parameter of incomplete type in a definition,
4799 this is an error. In a declaration this is valid, and a
4800 struct or union type may be completed later, before any calls
4801 or definition of the function. In the case where the tag was
4802 first declared within the parameter list, a warning has
4803 already been given. If a parameter has void type, then
4804 however the function cannot be defined or called, so
4807 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4809 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4811 type = TREE_VALUE (typelt);
4812 if (type == error_mark_node)
4815 if (!COMPLETE_TYPE_P (type))
4819 if (DECL_NAME (parm))
4820 error ("parameter %u (%q+D) has incomplete type",
4823 error ("%Jparameter %u has incomplete type",
4826 TREE_VALUE (typelt) = error_mark_node;
4827 TREE_TYPE (parm) = error_mark_node;
4829 else if (VOID_TYPE_P (type))
4831 if (DECL_NAME (parm))
4832 warning (0, "parameter %u (%q+D) has void type",
4835 warning (0, "%Jparameter %u has void type",
4844 /* Take apart the current scope and return a c_arg_info structure with
4845 info on a parameter list just parsed.
4847 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4849 ELLIPSIS being true means the argument list ended in '...' so don't
4850 append a sentinel (void_list_node) to the end of the type-list. */
4853 get_parm_info (bool ellipsis)
4855 struct c_binding *b = current_scope->bindings;
4856 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4863 static bool explained_incomplete_types = false;
4864 bool gave_void_only_once_err = false;
4866 arg_info->parms = 0;
4868 arg_info->types = 0;
4869 arg_info->others = 0;
4871 /* The bindings in this scope must not get put into a block.
4872 We will take care of deleting the binding nodes. */
4873 current_scope->bindings = 0;
4875 /* This function is only called if there was *something* on the
4879 /* A parameter list consisting solely of 'void' indicates that the
4880 function takes no arguments. But if the 'void' is qualified
4881 (by 'const' or 'volatile'), or has a storage class specifier
4882 ('register'), then the behavior is undefined; issue an error.
4883 Typedefs for 'void' are OK (see DR#157). */
4884 if (b->prev == 0 /* one binding */
4885 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4886 && !DECL_NAME (b->decl) /* anonymous */
4887 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4889 if (TREE_THIS_VOLATILE (b->decl)
4890 || TREE_READONLY (b->decl)
4891 || C_DECL_REGISTER (b->decl))
4892 error ("%<void%> as only parameter may not be qualified");
4894 /* There cannot be an ellipsis. */
4896 error ("%<void%> must be the only parameter");
4898 arg_info->types = void_list_node;
4903 types = void_list_node;
4905 /* Break up the bindings list into parms, tags, types, and others;
4906 apply sanity checks; purge the name-to-decl bindings. */
4909 tree decl = b->decl;
4910 tree type = TREE_TYPE (decl);
4911 const char *keyword;
4913 switch (TREE_CODE (decl))
4918 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4919 I_SYMBOL_BINDING (b->id) = b->shadowed;
4922 /* Check for forward decls that never got their actual decl. */
4923 if (TREE_ASM_WRITTEN (decl))
4924 error ("parameter %q+D has just a forward declaration", decl);
4925 /* Check for (..., void, ...) and issue an error. */
4926 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4928 if (!gave_void_only_once_err)
4930 error ("%<void%> must be the only parameter");
4931 gave_void_only_once_err = true;
4936 /* Valid parameter, add it to the list. */
4937 TREE_CHAIN (decl) = parms;
4940 /* Since there is a prototype, args are passed in their
4941 declared types. The back end may override this later. */
4942 DECL_ARG_TYPE (decl) = type;
4943 types = tree_cons (0, type, types);
4947 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4948 case UNION_TYPE: keyword = "union"; goto tag;
4949 case RECORD_TYPE: keyword = "struct"; goto tag;
4951 /* Types may not have tag-names, in which case the type
4952 appears in the bindings list with b->id NULL. */
4955 gcc_assert (I_TAG_BINDING (b->id) == b);
4956 I_TAG_BINDING (b->id) = b->shadowed;
4959 /* Warn about any struct, union or enum tags defined in a
4960 parameter list. The scope of such types is limited to
4961 the parameter list, which is rarely if ever desirable
4962 (it's impossible to call such a function with type-
4963 correct arguments). An anonymous union parm type is
4964 meaningful as a GNU extension, so don't warn for that. */
4965 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4968 /* The %s will be one of 'struct', 'union', or 'enum'. */
4969 warning (0, "%<%s %E%> declared inside parameter list",
4972 /* The %s will be one of 'struct', 'union', or 'enum'. */
4973 warning (0, "anonymous %s declared inside parameter list",
4976 if (!explained_incomplete_types)
4978 warning (0, "its scope is only this definition or declaration,"
4979 " which is probably not what you want");
4980 explained_incomplete_types = true;
4984 tags = tree_cons (b->id, decl, tags);
4990 /* CONST_DECLs appear here when we have an embedded enum,
4991 and TYPE_DECLs appear here when we have an embedded struct
4992 or union. No warnings for this - we already warned about the
4993 type itself. FUNCTION_DECLs appear when there is an implicit
4994 function declaration in the parameter list. */
4996 TREE_CHAIN (decl) = others;
5001 /* error_mark_node appears here when we have an undeclared
5002 variable. Just throw it away. */
5005 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5006 I_SYMBOL_BINDING (b->id) = b->shadowed;
5010 /* Other things that might be encountered. */
5017 b = free_binding_and_advance (b);
5020 arg_info->parms = parms;
5021 arg_info->tags = tags;
5022 arg_info->types = types;
5023 arg_info->others = others;
5027 /* Get the struct, enum or union (CODE says which) with tag NAME.
5028 Define the tag as a forward-reference if it is not defined.
5029 Return a c_typespec structure for the type specifier. */
5032 parser_xref_tag (enum tree_code code, tree name)
5034 struct c_typespec ret;
5035 /* If a cross reference is requested, look up the type
5036 already defined for this tag and return it. */
5038 tree ref = lookup_tag (code, name, 0);
5039 /* If this is the right type of tag, return what we found.
5040 (This reference will be shadowed by shadow_tag later if appropriate.)
5041 If this is the wrong type of tag, do not return it. If it was the
5042 wrong type in the same scope, we will have had an error
5043 message already; if in a different scope and declaring
5044 a name, pending_xref_error will give an error message; but if in a
5045 different scope and not declaring a name, this tag should
5046 shadow the previous declaration of a different type of tag, and
5047 this would not work properly if we return the reference found.
5048 (For example, with "struct foo" in an outer scope, "union foo;"
5049 must shadow that tag with a new one of union type.) */
5050 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5051 if (ref && TREE_CODE (ref) == code)
5057 /* If no such tag is yet defined, create a forward-reference node
5058 and record it as the "definition".
5059 When a real declaration of this type is found,
5060 the forward-reference will be altered into a real type. */
5062 ref = make_node (code);
5063 if (code == ENUMERAL_TYPE)
5065 /* Give the type a default layout like unsigned int
5066 to avoid crashing if it does not get defined. */
5067 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5068 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5069 TYPE_USER_ALIGN (ref) = 0;
5070 TYPE_UNSIGNED (ref) = 1;
5071 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5072 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5073 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5076 pushtag (name, ref);
5082 /* Get the struct, enum or union (CODE says which) with tag NAME.
5083 Define the tag as a forward-reference if it is not defined.
5084 Return a tree for the type. */
5087 xref_tag (enum tree_code code, tree name)
5089 return parser_xref_tag (code, name).spec;
5092 /* Make sure that the tag NAME is defined *in the current scope*
5093 at least as a forward reference.
5094 CODE says which kind of tag NAME ought to be. */
5097 start_struct (enum tree_code code, tree name)
5099 /* If there is already a tag defined at this scope
5100 (as a forward reference), just return it. */
5105 ref = lookup_tag (code, name, 1);
5106 if (ref && TREE_CODE (ref) == code)
5108 if (TYPE_SIZE (ref))
5110 if (code == UNION_TYPE)
5111 error ("redefinition of %<union %E%>", name);
5113 error ("redefinition of %<struct %E%>", name);
5115 else if (C_TYPE_BEING_DEFINED (ref))
5117 if (code == UNION_TYPE)
5118 error ("nested redefinition of %<union %E%>", name);
5120 error ("nested redefinition of %<struct %E%>", name);
5125 /* Otherwise create a forward-reference just so the tag is in scope. */
5127 ref = make_node (code);
5128 pushtag (name, ref);
5131 C_TYPE_BEING_DEFINED (ref) = 1;
5132 TYPE_PACKED (ref) = flag_pack_struct;
5136 /* Process the specs, declarator and width (NULL if omitted)
5137 of a structure component, returning a FIELD_DECL node.
5138 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5140 This is done during the parsing of the struct declaration.
5141 The FIELD_DECL nodes are chained together and the lot of them
5142 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5145 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5150 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5151 && width == NULL_TREE)
5153 /* This is an unnamed decl.
5155 If we have something of the form "union { list } ;" then this
5156 is the anonymous union extension. Similarly for struct.
5158 If this is something of the form "struct foo;", then
5159 If MS extensions are enabled, this is handled as an
5161 Otherwise this is a forward declaration of a structure tag.
5163 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5164 If MS extensions are enabled and foo names a structure, then
5165 again this is an anonymous struct.
5166 Otherwise this is an error.
5168 Oh what a horrid tangled web we weave. I wonder if MS consciously
5169 took this from Plan 9 or if it was an accident of implementation
5170 that took root before someone noticed the bug... */
5172 tree type = declspecs->type;
5173 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5174 || TREE_CODE (type) == UNION_TYPE);
5178 && (flag_ms_extensions || !declspecs->typedef_p))
5180 if (flag_ms_extensions)
5184 else if (TYPE_NAME (type) == NULL)
5191 pedwarn ("declaration does not declare anything");
5195 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5198 value = grokdeclarator (declarator, declspecs, FIELD, false,
5199 width ? &width : NULL);
5201 finish_decl (value, NULL_TREE, NULL_TREE);
5202 DECL_INITIAL (value) = width;
5207 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5208 the list such that this does not present a problem later. */
5211 detect_field_duplicates (tree fieldlist)
5216 /* First, see if there are more than "a few" fields.
5217 This is trivially true if there are zero or one fields. */
5220 x = TREE_CHAIN (fieldlist);
5226 } while (timeout > 0 && x);
5228 /* If there were "few" fields, avoid the overhead of allocating
5229 a hash table. Instead just do the nested traversal thing. */
5232 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5235 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5236 if (DECL_NAME (y) == DECL_NAME (x))
5238 error ("duplicate member %q+D", x);
5239 DECL_NAME (x) = NULL_TREE;
5245 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5248 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5249 if ((y = DECL_NAME (x)) != 0)
5251 slot = htab_find_slot (htab, y, INSERT);
5254 error ("duplicate member %q+D", x);
5255 DECL_NAME (x) = NULL_TREE;
5264 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5265 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5266 ATTRIBUTES are attributes to be applied to the structure. */
5269 finish_struct (tree t, tree fieldlist, tree attributes)
5272 bool toplevel = file_scope == current_scope;
5273 int saw_named_field;
5275 /* If this type was previously laid out as a forward reference,
5276 make sure we lay it out again. */
5280 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5284 for (x = fieldlist; x; x = TREE_CHAIN (x))
5285 if (DECL_NAME (x) != 0)
5290 if (TREE_CODE (t) == UNION_TYPE)
5293 pedwarn ("union has no named members");
5295 pedwarn ("union has no members");
5300 pedwarn ("struct has no named members");
5302 pedwarn ("struct has no members");
5307 /* Install struct as DECL_CONTEXT of each field decl.
5308 Also process specified field sizes, found in the DECL_INITIAL,
5309 storing 0 there after the type has been changed to precision equal
5310 to its width, rather than the precision of the specified standard
5311 type. (Correct layout requires the original type to have been preserved
5314 saw_named_field = 0;
5315 for (x = fieldlist; x; x = TREE_CHAIN (x))
5317 DECL_CONTEXT (x) = t;
5318 DECL_PACKED (x) |= TYPE_PACKED (t);
5320 /* If any field is const, the structure type is pseudo-const. */
5321 if (TREE_READONLY (x))
5322 C_TYPE_FIELDS_READONLY (t) = 1;
5325 /* A field that is pseudo-const makes the structure likewise. */
5326 tree t1 = TREE_TYPE (x);
5327 while (TREE_CODE (t1) == ARRAY_TYPE)
5328 t1 = TREE_TYPE (t1);
5329 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5330 && C_TYPE_FIELDS_READONLY (t1))
5331 C_TYPE_FIELDS_READONLY (t) = 1;
5334 /* Any field that is volatile means variables of this type must be
5335 treated in some ways as volatile. */
5336 if (TREE_THIS_VOLATILE (x))
5337 C_TYPE_FIELDS_VOLATILE (t) = 1;
5339 /* Any field of nominal variable size implies structure is too. */
5340 if (C_DECL_VARIABLE_SIZE (x))
5341 C_TYPE_VARIABLE_SIZE (t) = 1;
5343 if (DECL_INITIAL (x))
5345 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5346 DECL_SIZE (x) = bitsize_int (width);
5347 DECL_BIT_FIELD (x) = 1;
5348 SET_DECL_C_BIT_FIELD (x);
5351 /* Detect flexible array member in an invalid context. */
5352 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5353 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5354 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5355 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5357 if (TREE_CODE (t) == UNION_TYPE)
5359 error ("%Jflexible array member in union", x);
5360 TREE_TYPE (x) = error_mark_node;
5362 else if (TREE_CHAIN (x) != NULL_TREE)
5364 error ("%Jflexible array member not at end of struct", x);
5365 TREE_TYPE (x) = error_mark_node;
5367 else if (!saw_named_field)
5369 error ("%Jflexible array member in otherwise empty struct", x);
5370 TREE_TYPE (x) = error_mark_node;
5374 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5375 && flexible_array_type_p (TREE_TYPE (x)))
5376 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5379 saw_named_field = 1;
5382 detect_field_duplicates (fieldlist);
5384 /* Now we have the nearly final fieldlist. Record it,
5385 then lay out the structure or union (including the fields). */
5387 TYPE_FIELDS (t) = fieldlist;
5391 /* Give bit-fields their proper types. */
5393 tree *fieldlistp = &fieldlist;
5395 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5396 && TREE_TYPE (*fieldlistp) != error_mark_node)
5398 unsigned HOST_WIDE_INT width
5399 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5400 tree type = TREE_TYPE (*fieldlistp);
5401 if (width != TYPE_PRECISION (type))
5403 TREE_TYPE (*fieldlistp)
5404 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5405 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5407 DECL_INITIAL (*fieldlistp) = 0;
5410 fieldlistp = &TREE_CHAIN (*fieldlistp);
5413 /* Now we have the truly final field list.
5414 Store it in this type and in the variants. */
5416 TYPE_FIELDS (t) = fieldlist;
5418 /* If there are lots of fields, sort so we can look through them fast.
5419 We arbitrarily consider 16 or more elts to be "a lot". */
5424 for (x = fieldlist; x; x = TREE_CHAIN (x))
5426 if (len > 15 || DECL_NAME (x) == NULL)
5434 struct lang_type *space;
5435 struct sorted_fields_type *space2;
5437 len += list_length (x);
5439 /* Use the same allocation policy here that make_node uses, to
5440 ensure that this lives as long as the rest of the struct decl.
5441 All decls in an inline function need to be saved. */
5443 space = GGC_CNEW (struct lang_type);
5444 space2 = GGC_NEWVAR (struct sorted_fields_type,
5445 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5449 field_array = &space2->elts[0];
5450 for (x = fieldlist; x; x = TREE_CHAIN (x))
5452 field_array[len++] = x;
5454 /* If there is anonymous struct or union, break out of the loop. */
5455 if (DECL_NAME (x) == NULL)
5458 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5461 TYPE_LANG_SPECIFIC (t) = space;
5462 TYPE_LANG_SPECIFIC (t)->s->len = len;
5463 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5464 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5469 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5471 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5472 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5473 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5474 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5475 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5476 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5477 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5480 /* If this was supposed to be a transparent union, but we can't
5481 make it one, warn and turn off the flag. */
5482 if (TREE_CODE (t) == UNION_TYPE
5483 && TYPE_TRANSPARENT_UNION (t)
5484 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5486 TYPE_TRANSPARENT_UNION (t) = 0;
5487 warning (0, "union cannot be made transparent");
5490 /* If this structure or union completes the type of any previous
5491 variable declaration, lay it out and output its rtl. */
5492 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5496 tree decl = TREE_VALUE (x);
5497 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5498 layout_array_type (TREE_TYPE (decl));
5499 if (TREE_CODE (decl) != TYPE_DECL)
5501 layout_decl (decl, 0);
5502 if (c_dialect_objc ())
5503 objc_check_decl (decl);
5504 rest_of_decl_compilation (decl, toplevel, 0);
5509 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5511 /* Finish debugging output for this type. */
5512 rest_of_type_compilation (t, toplevel);
5514 /* If we're inside a function proper, i.e. not file-scope and not still
5515 parsing parameters, then arrange for the size of a variable sized type
5517 if (cur_stmt_list && variably_modified_type_p (t, NULL))
5518 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5523 /* Lay out the type T, and its element type, and so on. */
5526 layout_array_type (tree t)
5528 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5529 layout_array_type (TREE_TYPE (t));
5533 /* Begin compiling the definition of an enumeration type.
5534 NAME is its name (or null if anonymous).
5535 Returns the type object, as yet incomplete.
5536 Also records info about it so that build_enumerator
5537 may be used to declare the individual values as they are read. */
5540 start_enum (tree name)
5544 /* If this is the real definition for a previous forward reference,
5545 fill in the contents in the same object that used to be the
5546 forward reference. */
5549 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5551 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5553 enumtype = make_node (ENUMERAL_TYPE);
5554 pushtag (name, enumtype);
5557 if (C_TYPE_BEING_DEFINED (enumtype))
5558 error ("nested redefinition of %<enum %E%>", name);
5560 C_TYPE_BEING_DEFINED (enumtype) = 1;
5562 if (TYPE_VALUES (enumtype) != 0)
5564 /* This enum is a named one that has been declared already. */
5565 error ("redeclaration of %<enum %E%>", name);
5567 /* Completely replace its old definition.
5568 The old enumerators remain defined, however. */
5569 TYPE_VALUES (enumtype) = 0;
5572 enum_next_value = integer_zero_node;
5575 if (flag_short_enums)
5576 TYPE_PACKED (enumtype) = 1;
5581 /* After processing and defining all the values of an enumeration type,
5582 install their decls in the enumeration type and finish it off.
5583 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5584 and ATTRIBUTES are the specified attributes.
5585 Returns ENUMTYPE. */
5588 finish_enum (tree enumtype, tree values, tree attributes)
5591 tree minnode = 0, maxnode = 0;
5592 int precision, unsign;
5593 bool toplevel = (file_scope == current_scope);
5594 struct lang_type *lt;
5596 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5598 /* Calculate the maximum value of any enumerator in this type. */
5600 if (values == error_mark_node)
5601 minnode = maxnode = integer_zero_node;
5604 minnode = maxnode = TREE_VALUE (values);
5605 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5607 tree value = TREE_VALUE (pair);
5608 if (tree_int_cst_lt (maxnode, value))
5610 if (tree_int_cst_lt (value, minnode))
5615 /* Construct the final type of this enumeration. It is the same
5616 as one of the integral types - the narrowest one that fits, except
5617 that normally we only go as narrow as int - and signed iff any of
5618 the values are negative. */
5619 unsign = (tree_int_cst_sgn (minnode) >= 0);
5620 precision = MAX (min_precision (minnode, unsign),
5621 min_precision (maxnode, unsign));
5623 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5625 tem = c_common_type_for_size (precision, unsign);
5628 warning (0, "enumeration values exceed range of largest integer");
5629 tem = long_long_integer_type_node;
5633 tem = unsign ? unsigned_type_node : integer_type_node;
5635 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5636 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5637 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5638 TYPE_SIZE (enumtype) = 0;
5640 /* If the precision of the type was specific with an attribute and it
5641 was too small, give an error. Otherwise, use it. */
5642 if (TYPE_PRECISION (enumtype))
5644 if (precision > TYPE_PRECISION (enumtype))
5645 error ("specified mode too small for enumeral values");
5648 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5650 layout_type (enumtype);
5652 if (values != error_mark_node)
5654 /* Change the type of the enumerators to be the enum type. We
5655 need to do this irrespective of the size of the enum, for
5656 proper type checking. Replace the DECL_INITIALs of the
5657 enumerators, and the value slots of the list, with copies
5658 that have the enum type; they cannot be modified in place
5659 because they may be shared (e.g. integer_zero_node) Finally,
5660 change the purpose slots to point to the names of the decls. */
5661 for (pair = values; pair; pair = TREE_CHAIN (pair))
5663 tree enu = TREE_PURPOSE (pair);
5664 tree ini = DECL_INITIAL (enu);
5666 TREE_TYPE (enu) = enumtype;
5668 /* The ISO C Standard mandates enumerators to have type int,
5669 even though the underlying type of an enum type is
5670 unspecified. Here we convert any enumerators that fit in
5671 an int to type int, to avoid promotions to unsigned types
5672 when comparing integers with enumerators that fit in the
5673 int range. When -pedantic is given, build_enumerator()
5674 would have already taken care of those that don't fit. */
5675 if (int_fits_type_p (ini, integer_type_node))
5676 tem = integer_type_node;
5679 ini = convert (tem, ini);
5681 DECL_INITIAL (enu) = ini;
5682 TREE_PURPOSE (pair) = DECL_NAME (enu);
5683 TREE_VALUE (pair) = ini;
5686 TYPE_VALUES (enumtype) = values;
5689 /* Record the min/max values so that we can warn about bit-field
5690 enumerations that are too small for the values. */
5691 lt = GGC_CNEW (struct lang_type);
5692 lt->enum_min = minnode;
5693 lt->enum_max = maxnode;
5694 TYPE_LANG_SPECIFIC (enumtype) = lt;
5696 /* Fix up all variant types of this enum type. */
5697 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5699 if (tem == enumtype)
5701 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5702 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5703 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5704 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5705 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5706 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5707 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5708 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5709 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5710 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5711 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5714 /* Finish debugging output for this type. */
5715 rest_of_type_compilation (enumtype, toplevel);
5720 /* Build and install a CONST_DECL for one value of the
5721 current enumeration type (one that was begun with start_enum).
5722 Return a tree-list containing the CONST_DECL and its value.
5723 Assignment of sequential values by default is handled here. */
5726 build_enumerator (tree name, tree value)
5730 /* Validate and default VALUE. */
5734 /* Don't issue more errors for error_mark_node (i.e. an
5735 undeclared identifier) - just ignore the value expression. */
5736 if (value == error_mark_node)
5738 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5739 || TREE_CODE (value) != INTEGER_CST)
5741 error ("enumerator value for %qE is not an integer constant", name);
5746 value = default_conversion (value);
5747 constant_expression_warning (value);
5751 /* Default based on previous value. */
5752 /* It should no longer be possible to have NON_LVALUE_EXPR
5756 value = enum_next_value;
5758 error ("overflow in enumeration values");
5761 if (pedantic && !int_fits_type_p (value, integer_type_node))
5763 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5764 /* XXX This causes -pedantic to change the meaning of the program.
5765 Remove? -zw 2004-03-15 */
5766 value = convert (integer_type_node, value);
5769 /* Set basis for default for next value. */
5770 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5771 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5773 /* Now create a declaration for the enum value name. */
5775 type = TREE_TYPE (value);
5776 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5777 TYPE_PRECISION (integer_type_node)),
5778 (TYPE_PRECISION (type)
5779 >= TYPE_PRECISION (integer_type_node)
5780 && TYPE_UNSIGNED (type)));
5782 decl = build_decl (CONST_DECL, name, type);
5783 DECL_INITIAL (decl) = convert (type, value);
5786 return tree_cons (decl, value, NULL_TREE);
5790 /* Create the FUNCTION_DECL for a function definition.
5791 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5792 the declaration; they describe the function's name and the type it returns,
5793 but twisted together in a fashion that parallels the syntax of C.
5795 This function creates a binding context for the function body
5796 as well as setting up the FUNCTION_DECL in current_function_decl.
5798 Returns 1 on success. If the DECLARATOR is not suitable for a function
5799 (it defines a datum instead), we return 0, which tells
5800 yyparse to report a parse error. */
5803 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5806 tree decl1, old_decl;
5807 tree restype, resdecl;
5808 struct c_label_context_se *nstack_se;
5809 struct c_label_context_vm *nstack_vm;
5811 current_function_returns_value = 0; /* Assume, until we see it does. */
5812 current_function_returns_null = 0;
5813 current_function_returns_abnormally = 0;
5814 warn_about_return_type = 0;
5815 current_extern_inline = 0;
5816 c_switch_stack = NULL;
5818 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
5819 nstack_se->labels_def = NULL;
5820 nstack_se->labels_used = NULL;
5821 nstack_se->next = label_context_stack_se;
5822 label_context_stack_se = nstack_se;
5824 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
5825 nstack_vm->labels_def = NULL;
5826 nstack_vm->labels_used = NULL;
5827 nstack_vm->scope = 0;
5828 nstack_vm->next = label_context_stack_vm;
5829 label_context_stack_vm = nstack_vm;
5831 /* Indicate no valid break/continue context by setting these variables
5832 to some non-null, non-label value. We'll notice and emit the proper
5833 error message in c_finish_bc_stmt. */
5834 c_break_label = c_cont_label = size_zero_node;
5836 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5838 /* If the declarator is not suitable for a function definition,
5839 cause a syntax error. */
5842 label_context_stack_se = label_context_stack_se->next;
5843 label_context_stack_vm = label_context_stack_vm->next;
5847 decl_attributes (&decl1, attributes, 0);
5849 if (DECL_DECLARED_INLINE_P (decl1)
5850 && DECL_UNINLINABLE (decl1)
5851 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5852 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
5855 announce_function (decl1);
5857 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5859 error ("return type is an incomplete type");
5860 /* Make it return void instead. */
5862 = build_function_type (void_type_node,
5863 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5866 if (warn_about_return_type)
5867 pedwarn_c99 ("return type defaults to %<int%>");
5869 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5870 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5871 DECL_INITIAL (decl1) = error_mark_node;
5873 /* If this definition isn't a prototype and we had a prototype declaration
5874 before, copy the arg type info from that prototype. */
5875 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5876 current_function_prototype_locus = UNKNOWN_LOCATION;
5877 current_function_prototype_built_in = false;
5878 current_function_prototype_arg_types = NULL_TREE;
5879 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5881 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5882 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5883 TREE_TYPE (TREE_TYPE (old_decl))))
5885 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5887 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5888 current_function_prototype_built_in
5889 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
5890 current_function_prototype_arg_types
5891 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
5893 if (TREE_PUBLIC (decl1))
5895 /* If there is an external prototype declaration of this
5896 function, record its location but do not copy information
5897 to this decl. This may be an invisible declaration
5898 (built-in or in a scope which has finished) or simply
5899 have more refined argument types than any declaration
5901 struct c_binding *b;
5902 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
5903 if (B_IN_SCOPE (b, external_scope))
5907 tree ext_decl, ext_type;
5909 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
5910 if (TREE_CODE (ext_type) == FUNCTION_TYPE
5911 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5912 TREE_TYPE (ext_type)))
5914 current_function_prototype_locus
5915 = DECL_SOURCE_LOCATION (ext_decl);
5916 current_function_prototype_built_in
5917 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
5918 current_function_prototype_arg_types
5919 = TYPE_ARG_TYPES (ext_type);
5925 /* Optionally warn of old-fashioned def with no previous prototype. */
5926 if (warn_strict_prototypes
5927 && old_decl != error_mark_node
5928 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5929 && C_DECL_ISNT_PROTOTYPE (old_decl))
5930 warning (OPT_Wstrict_prototypes,
5931 "function declaration isn%'t a prototype");
5932 /* Optionally warn of any global def with no previous prototype. */
5933 else if (warn_missing_prototypes
5934 && old_decl != error_mark_node
5935 && TREE_PUBLIC (decl1)
5936 && !MAIN_NAME_P (DECL_NAME (decl1))
5937 && C_DECL_ISNT_PROTOTYPE (old_decl))
5938 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
5939 /* Optionally warn of any def with no previous prototype
5940 if the function has already been used. */
5941 else if (warn_missing_prototypes
5943 && old_decl != error_mark_node
5944 && TREE_USED (old_decl)
5945 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5946 warning (OPT_Wmissing_prototypes,
5947 "%q+D was used with no prototype before its definition", decl1);
5948 /* Optionally warn of any global def with no previous declaration. */
5949 else if (warn_missing_declarations
5950 && TREE_PUBLIC (decl1)
5952 && !MAIN_NAME_P (DECL_NAME (decl1)))
5953 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
5955 /* Optionally warn of any def with no previous declaration
5956 if the function has already been used. */
5957 else if (warn_missing_declarations
5959 && old_decl != error_mark_node
5960 && TREE_USED (old_decl)
5961 && C_DECL_IMPLICIT (old_decl))
5962 warning (OPT_Wmissing_declarations,
5963 "%q+D was used with no declaration before its definition", decl1);
5965 /* This is a definition, not a reference.
5966 So normally clear DECL_EXTERNAL.
5967 However, `extern inline' acts like a declaration
5968 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5969 DECL_EXTERNAL (decl1) = current_extern_inline;
5971 /* This function exists in static storage.
5972 (This does not mean `static' in the C sense!) */
5973 TREE_STATIC (decl1) = 1;
5975 /* A nested function is not global. */
5976 if (current_function_decl != 0)
5977 TREE_PUBLIC (decl1) = 0;
5979 /* This is the earliest point at which we might know the assembler
5980 name of the function. Thus, if it's set before this, die horribly. */
5981 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5983 /* If #pragma weak was used, mark the decl weak now. */
5984 if (current_scope == file_scope)
5985 maybe_apply_pragma_weak (decl1);
5987 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5988 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5993 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5994 != integer_type_node)
5995 pedwarn ("return type of %q+D is not %<int%>", decl1);
5997 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5998 args = TREE_CHAIN (args))
6000 tree type = args ? TREE_VALUE (args) : 0;
6002 if (type == void_type_node)
6009 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6010 pedwarn ("first argument of %q+D should be %<int%>", decl1);
6014 if (TREE_CODE (type) != POINTER_TYPE
6015 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6016 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6018 pedwarn ("second argument of %q+D should be %<char **%>",
6023 if (TREE_CODE (type) != POINTER_TYPE
6024 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6025 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6027 pedwarn ("third argument of %q+D should probably be "
6028 "%<char **%>", decl1);
6033 /* It is intentional that this message does not mention the third
6034 argument because it's only mentioned in an appendix of the
6036 if (argct > 0 && (argct < 2 || argct > 3))
6037 pedwarn ("%q+D takes only zero or two arguments", decl1);
6039 if (!TREE_PUBLIC (decl1))
6040 pedwarn ("%q+D is normally a non-static function", decl1);
6043 /* Record the decl so that the function name is defined.
6044 If we already have a decl for this name, and it is a FUNCTION_DECL,
6045 use the old decl. */
6047 current_function_decl = pushdecl (decl1);
6050 declare_parm_level ();
6052 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6053 /* Promote the value to int before returning it. */
6054 if (c_promoting_integer_type_p (restype))
6056 /* It retains unsignedness if not really getting wider. */
6057 if (TYPE_UNSIGNED (restype)
6058 && (TYPE_PRECISION (restype)
6059 == TYPE_PRECISION (integer_type_node)))
6060 restype = unsigned_type_node;
6062 restype = integer_type_node;
6065 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6066 DECL_ARTIFICIAL (resdecl) = 1;
6067 DECL_IGNORED_P (resdecl) = 1;
6068 DECL_RESULT (current_function_decl) = resdecl;
6070 start_fname_decls ();
6075 /* Subroutine of store_parm_decls which handles new-style function
6076 definitions (prototype format). The parms already have decls, so we
6077 need only record them as in effect and complain if any redundant
6078 old-style parm decls were written. */
6080 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6084 if (current_scope->bindings)
6086 error ("%Jold-style parameter declarations in prototyped "
6087 "function definition", fndecl);
6089 /* Get rid of the old-style declarations. */
6093 /* Don't issue this warning for nested functions, and don't issue this
6094 warning if we got here because ARG_INFO_TYPES was error_mark_node
6095 (this happens when a function definition has just an ellipsis in
6096 its parameter list). */
6097 else if (!in_system_header && !current_function_scope
6098 && arg_info->types != error_mark_node)
6099 warning (OPT_Wtraditional,
6100 "%Jtraditional C rejects ISO C style function definitions",
6103 /* Now make all the parameter declarations visible in the function body.
6104 We can bypass most of the grunt work of pushdecl. */
6105 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6107 DECL_CONTEXT (decl) = current_function_decl;
6108 if (DECL_NAME (decl))
6109 bind (DECL_NAME (decl), decl, current_scope,
6110 /*invisible=*/false, /*nested=*/false);
6112 error ("%Jparameter name omitted", decl);
6115 /* Record the parameter list in the function declaration. */
6116 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6118 /* Now make all the ancillary declarations visible, likewise. */
6119 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6121 DECL_CONTEXT (decl) = current_function_decl;
6122 if (DECL_NAME (decl))
6123 bind (DECL_NAME (decl), decl, current_scope,
6124 /*invisible=*/false, /*nested=*/false);
6127 /* And all the tag declarations. */
6128 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6129 if (TREE_PURPOSE (decl))
6130 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6131 /*invisible=*/false, /*nested=*/false);
6134 /* Subroutine of store_parm_decls which handles old-style function
6135 definitions (separate parameter list and declarations). */
6138 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6140 struct c_binding *b;
6141 tree parm, decl, last;
6142 tree parmids = arg_info->parms;
6143 struct pointer_set_t *seen_args = pointer_set_create ();
6145 if (!in_system_header)
6146 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6149 /* Match each formal parameter name with its declaration. Save each
6150 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6151 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6153 if (TREE_VALUE (parm) == 0)
6155 error ("%Jparameter name missing from parameter list", fndecl);
6156 TREE_PURPOSE (parm) = 0;
6160 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6161 if (b && B_IN_CURRENT_SCOPE (b))
6164 /* If we got something other than a PARM_DECL it is an error. */
6165 if (TREE_CODE (decl) != PARM_DECL)
6166 error ("%q+D declared as a non-parameter", decl);
6167 /* If the declaration is already marked, we have a duplicate
6168 name. Complain and ignore the duplicate. */
6169 else if (pointer_set_contains (seen_args, decl))
6171 error ("multiple parameters named %q+D", decl);
6172 TREE_PURPOSE (parm) = 0;
6175 /* If the declaration says "void", complain and turn it into
6177 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6179 error ("parameter %q+D declared with void type", decl);
6180 TREE_TYPE (decl) = integer_type_node;
6181 DECL_ARG_TYPE (decl) = integer_type_node;
6182 layout_decl (decl, 0);
6185 /* If no declaration found, default to int. */
6188 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6189 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6190 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6194 pedwarn ("type of %q+D defaults to %<int%>", decl);
6195 else if (extra_warnings)
6196 warning (OPT_Wextra, "type of %q+D defaults to %<int%>", decl);
6199 TREE_PURPOSE (parm) = decl;
6200 pointer_set_insert (seen_args, decl);
6203 /* Now examine the parms chain for incomplete declarations
6204 and declarations with no corresponding names. */
6206 for (b = current_scope->bindings; b; b = b->prev)
6209 if (TREE_CODE (parm) != PARM_DECL)
6212 if (TREE_TYPE (parm) != error_mark_node
6213 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6215 error ("parameter %q+D has incomplete type", parm);
6216 TREE_TYPE (parm) = error_mark_node;
6219 if (!pointer_set_contains (seen_args, parm))
6221 error ("declaration for parameter %q+D but no such parameter", parm);
6223 /* Pretend the parameter was not missing.
6224 This gets us to a standard state and minimizes
6225 further error messages. */
6226 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6230 /* Chain the declarations together in the order of the list of
6231 names. Store that chain in the function decl, replacing the
6232 list of names. Update the current scope to match. */
6233 DECL_ARGUMENTS (fndecl) = 0;
6235 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6236 if (TREE_PURPOSE (parm))
6238 if (parm && TREE_PURPOSE (parm))
6240 last = TREE_PURPOSE (parm);
6241 DECL_ARGUMENTS (fndecl) = last;
6243 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6244 if (TREE_PURPOSE (parm))
6246 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6247 last = TREE_PURPOSE (parm);
6249 TREE_CHAIN (last) = 0;
6252 pointer_set_destroy (seen_args);
6254 /* If there was a previous prototype,
6255 set the DECL_ARG_TYPE of each argument according to
6256 the type previously specified, and report any mismatches. */
6258 if (current_function_prototype_arg_types)
6261 for (parm = DECL_ARGUMENTS (fndecl),
6262 type = current_function_prototype_arg_types;
6263 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6264 != void_type_node));
6265 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6267 if (parm == 0 || type == 0
6268 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6270 if (current_function_prototype_built_in)
6271 warning (0, "number of arguments doesn%'t match "
6272 "built-in prototype");
6275 error ("number of arguments doesn%'t match prototype");
6276 error ("%Hprototype declaration",
6277 ¤t_function_prototype_locus);
6281 /* Type for passing arg must be consistent with that
6282 declared for the arg. ISO C says we take the unqualified
6283 type for parameters declared with qualified type. */
6284 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6285 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6287 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6288 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6290 /* Adjust argument to match prototype. E.g. a previous
6291 `int foo(float);' prototype causes
6292 `int foo(x) float x; {...}' to be treated like
6293 `int foo(float x) {...}'. This is particularly
6294 useful for argument types like uid_t. */
6295 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6297 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6298 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6299 && TYPE_PRECISION (TREE_TYPE (parm))
6300 < TYPE_PRECISION (integer_type_node))
6301 DECL_ARG_TYPE (parm) = integer_type_node;
6305 /* ??? Is it possible to get here with a
6306 built-in prototype or will it always have
6307 been diagnosed as conflicting with an
6308 old-style definition and discarded? */
6309 if (current_function_prototype_built_in)
6310 warning (0, "promoted argument %qD "
6311 "doesn%'t match built-in prototype", parm);
6314 pedwarn ("promoted argument %qD "
6315 "doesn%'t match prototype", parm);
6316 pedwarn ("%Hprototype declaration",
6317 ¤t_function_prototype_locus);
6323 if (current_function_prototype_built_in)
6324 warning (0, "argument %qD doesn%'t match "
6325 "built-in prototype", parm);
6328 error ("argument %qD doesn%'t match prototype", parm);
6329 error ("%Hprototype declaration",
6330 ¤t_function_prototype_locus);
6335 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6338 /* Otherwise, create a prototype that would match. */
6342 tree actual = 0, last = 0, type;
6344 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6346 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6348 TREE_CHAIN (last) = type;
6353 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6355 TREE_CHAIN (last) = type;
6359 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6360 of the type of this function, but we need to avoid having this
6361 affect the types of other similarly-typed functions, so we must
6362 first force the generation of an identical (but separate) type
6363 node for the relevant function type. The new node we create
6364 will be a variant of the main variant of the original function
6367 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6369 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6373 /* Store parameter declarations passed in ARG_INFO into the current
6374 function declaration. */
6377 store_parm_decls_from (struct c_arg_info *arg_info)
6379 current_function_arg_info = arg_info;
6380 store_parm_decls ();
6383 /* Store the parameter declarations into the current function declaration.
6384 This is called after parsing the parameter declarations, before
6385 digesting the body of the function.
6387 For an old-style definition, construct a prototype out of the old-style
6388 parameter declarations and inject it into the function's type. */
6391 store_parm_decls (void)
6393 tree fndecl = current_function_decl;
6396 /* The argument information block for FNDECL. */
6397 struct c_arg_info *arg_info = current_function_arg_info;
6398 current_function_arg_info = 0;
6400 /* True if this definition is written with a prototype. Note:
6401 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6402 list in a function definition as equivalent to (void) -- an
6403 empty argument list specifies the function has no parameters,
6404 but only (void) sets up a prototype for future calls. */
6405 proto = arg_info->types != 0;
6408 store_parm_decls_newstyle (fndecl, arg_info);
6410 store_parm_decls_oldstyle (fndecl, arg_info);
6412 /* The next call to push_scope will be a function body. */
6414 next_is_function_body = true;
6416 /* Write a record describing this function definition to the prototypes
6417 file (if requested). */
6419 gen_aux_info_record (fndecl, 1, 0, proto);
6421 /* Initialize the RTL code for the function. */
6422 allocate_struct_function (fndecl);
6424 /* Begin the statement tree for this function. */
6425 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6427 /* ??? Insert the contents of the pending sizes list into the function
6428 to be evaluated. The only reason left to have this is
6429 void foo(int n, int array[n++])
6430 because we throw away the array type in favor of a pointer type, and
6431 thus won't naturally see the SAVE_EXPR containing the increment. All
6432 other pending sizes would be handled by gimplify_parameters. */
6435 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6436 add_stmt (TREE_VALUE (t));
6439 /* Even though we're inside a function body, we still don't want to
6440 call expand_expr to calculate the size of a variable-sized array.
6441 We haven't necessarily assigned RTL to all variables yet, so it's
6442 not safe to try to expand expressions involving them. */
6443 cfun->x_dont_save_pending_sizes_p = 1;
6446 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6450 c_warn_unused_result_recursively (tree fndecl)
6452 struct cgraph_node *cgn;
6454 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6455 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6457 /* Finalize all nested functions now. */
6458 cgn = cgraph_node (fndecl);
6459 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6460 c_warn_unused_result_recursively (cgn->decl);
6463 /* Finish up a function declaration and compile that function
6464 all the way to assembler language output. The free the storage
6465 for the function definition.
6467 This is called after parsing the body of the function definition. */
6470 finish_function (void)
6472 tree fndecl = current_function_decl;
6474 label_context_stack_se = label_context_stack_se->next;
6475 label_context_stack_vm = label_context_stack_vm->next;
6477 if (TREE_CODE (fndecl) == FUNCTION_DECL
6478 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6480 tree args = DECL_ARGUMENTS (fndecl);
6481 for (; args; args = TREE_CHAIN (args))
6483 tree type = TREE_TYPE (args);
6484 if (INTEGRAL_TYPE_P (type)
6485 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6486 DECL_ARG_TYPE (args) = integer_type_node;
6490 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6491 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6493 /* Must mark the RESULT_DECL as being in this function. */
6495 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6496 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6498 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6500 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6501 != integer_type_node)
6503 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6504 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6506 pedwarn ("return type of %q+D is not %<int%>", fndecl);
6512 tree stmt = c_finish_return (integer_zero_node);
6513 #ifdef USE_MAPPED_LOCATION
6514 /* Hack. We don't want the middle-end to warn that this return
6515 is unreachable, so we mark its location as special. Using
6516 UNKNOWN_LOCATION has the problem that it gets clobbered in
6517 annotate_one_with_locus. A cleaner solution might be to
6518 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6520 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6522 /* Hack. We don't want the middle-end to warn that this
6523 return is unreachable, so put the statement on the
6525 annotate_with_file_line (stmt, input_filename, 0);
6531 /* Tie off the statement tree for this function. */
6532 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6534 finish_fname_decls ();
6536 /* Complain if there's just no return statement. */
6537 if (warn_return_type
6538 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6539 && !current_function_returns_value && !current_function_returns_null
6540 /* Don't complain if we are no-return. */
6541 && !current_function_returns_abnormally
6542 /* Don't warn for main(). */
6543 && !MAIN_NAME_P (DECL_NAME (fndecl))
6544 /* Or if they didn't actually specify a return type. */
6545 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6546 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6547 inline function, as we might never be compiled separately. */
6548 && DECL_INLINE (fndecl))
6550 warning (OPT_Wreturn_type,
6551 "no return statement in function returning non-void");
6552 TREE_NO_WARNING (fndecl) = 1;
6555 /* With just -Wextra, complain only if function returns both with
6556 and without a value. */
6558 && current_function_returns_value
6559 && current_function_returns_null)
6560 warning (OPT_Wextra, "this function may return with or without a value");
6562 /* Store the end of the function, so that we get good line number
6563 info for the epilogue. */
6564 cfun->function_end_locus = input_location;
6566 /* If we don't have ctors/dtors sections, and this is a static
6567 constructor or destructor, it must be recorded now. */
6568 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6569 && !targetm.have_ctors_dtors)
6570 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6571 if (DECL_STATIC_DESTRUCTOR (fndecl)
6572 && !targetm.have_ctors_dtors)
6573 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6575 /* Finalize the ELF visibility for the function. */
6576 c_determine_visibility (fndecl);
6578 /* Genericize before inlining. Delay genericizing nested functions
6579 until their parent function is genericized. Since finalizing
6580 requires GENERIC, delay that as well. */
6582 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6583 && !undef_nested_function)
6585 if (!decl_function_context (fndecl))
6587 c_genericize (fndecl);
6588 c_warn_unused_result_recursively (fndecl);
6590 /* ??? Objc emits functions after finalizing the compilation unit.
6591 This should be cleaned up later and this conditional removed. */
6592 if (cgraph_global_info_ready)
6594 c_expand_body (fndecl);
6598 cgraph_finalize_function (fndecl, false);
6602 /* Register this function with cgraph just far enough to get it
6603 added to our parent's nested function list. Handy, since the
6604 C front end doesn't have such a list. */
6605 (void) cgraph_node (fndecl);
6609 if (!decl_function_context (fndecl))
6610 undef_nested_function = false;
6612 /* We're leaving the context of this function, so zap cfun.
6613 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6614 tree_rest_of_compilation. */
6616 current_function_decl = NULL;
6619 /* Generate the RTL for the body of FNDECL. */
6622 c_expand_body (tree fndecl)
6625 if (!DECL_INITIAL (fndecl)
6626 || DECL_INITIAL (fndecl) == error_mark_node)
6629 tree_rest_of_compilation (fndecl);
6631 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6632 && targetm.have_ctors_dtors)
6633 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6634 DEFAULT_INIT_PRIORITY);
6635 if (DECL_STATIC_DESTRUCTOR (fndecl)
6636 && targetm.have_ctors_dtors)
6637 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6638 DEFAULT_INIT_PRIORITY);
6641 /* Check the declarations given in a for-loop for satisfying the C99
6644 check_for_loop_decls (void)
6646 struct c_binding *b;
6650 /* If we get here, declarations have been used in a for loop without
6651 the C99 for loop scope. This doesn't make much sense, so don't
6653 error ("%<for%> loop initial declaration used outside C99 mode");
6656 /* C99 subclause 6.8.5 paragraph 3:
6658 [#3] The declaration part of a for statement shall only
6659 declare identifiers for objects having storage class auto or
6662 It isn't clear whether, in this sentence, "identifiers" binds to
6663 "shall only declare" or to "objects" - that is, whether all identifiers
6664 declared must be identifiers for objects, or whether the restriction
6665 only applies to those that are. (A question on this in comp.std.c
6666 in November 2000 received no answer.) We implement the strictest
6667 interpretation, to avoid creating an extension which later causes
6670 for (b = current_scope->bindings; b; b = b->prev)
6673 tree decl = b->decl;
6678 switch (TREE_CODE (decl))
6681 if (TREE_STATIC (decl))
6682 error ("declaration of static variable %q+D in %<for%> loop "
6683 "initial declaration", decl);
6684 else if (DECL_EXTERNAL (decl))
6685 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6686 "initial declaration", decl);
6690 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6694 error ("%<union %E%> declared in %<for%> loop initial declaration",
6698 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6702 error ("declaration of non-variable %q+D in %<for%> loop "
6703 "initial declaration", decl);
6708 /* Save and reinitialize the variables
6709 used during compilation of a C function. */
6712 c_push_function_context (struct function *f)
6714 struct language_function *p;
6715 p = GGC_NEW (struct language_function);
6718 p->base.x_stmt_tree = c_stmt_tree;
6719 p->x_break_label = c_break_label;
6720 p->x_cont_label = c_cont_label;
6721 p->x_switch_stack = c_switch_stack;
6722 p->arg_info = current_function_arg_info;
6723 p->returns_value = current_function_returns_value;
6724 p->returns_null = current_function_returns_null;
6725 p->returns_abnormally = current_function_returns_abnormally;
6726 p->warn_about_return_type = warn_about_return_type;
6727 p->extern_inline = current_extern_inline;
6730 /* Restore the variables used during compilation of a C function. */
6733 c_pop_function_context (struct function *f)
6735 struct language_function *p = f->language;
6737 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6738 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6740 /* Stop pointing to the local nodes about to be freed. */
6741 /* But DECL_INITIAL must remain nonzero so we know this
6742 was an actual function definition. */
6743 DECL_INITIAL (current_function_decl) = error_mark_node;
6744 DECL_ARGUMENTS (current_function_decl) = 0;
6747 c_stmt_tree = p->base.x_stmt_tree;
6748 c_break_label = p->x_break_label;
6749 c_cont_label = p->x_cont_label;
6750 c_switch_stack = p->x_switch_stack;
6751 current_function_arg_info = p->arg_info;
6752 current_function_returns_value = p->returns_value;
6753 current_function_returns_null = p->returns_null;
6754 current_function_returns_abnormally = p->returns_abnormally;
6755 warn_about_return_type = p->warn_about_return_type;
6756 current_extern_inline = p->extern_inline;
6761 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6764 c_dup_lang_specific_decl (tree decl)
6766 struct lang_decl *ld;
6768 if (!DECL_LANG_SPECIFIC (decl))
6771 ld = GGC_NEW (struct lang_decl);
6772 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6773 DECL_LANG_SPECIFIC (decl) = ld;
6776 /* The functions below are required for functionality of doing
6777 function at once processing in the C front end. Currently these
6778 functions are not called from anywhere in the C front end, but as
6779 these changes continue, that will change. */
6781 /* Returns the stmt_tree (if any) to which statements are currently
6782 being added. If there is no active statement-tree, NULL is
6786 current_stmt_tree (void)
6788 return &c_stmt_tree;
6791 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6795 anon_aggr_type_p (tree ARG_UNUSED (node))
6800 /* Return the global value of T as a symbol. */
6803 identifier_global_value (tree t)
6805 struct c_binding *b;
6807 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6808 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6814 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6815 otherwise the name is found in ridpointers from RID_INDEX. */
6818 record_builtin_type (enum rid rid_index, const char *name, tree type)
6822 id = ridpointers[(int) rid_index];
6824 id = get_identifier (name);
6825 decl = build_decl (TYPE_DECL, id, type);
6827 if (debug_hooks->type_decl)
6828 debug_hooks->type_decl (decl, false);
6831 /* Build the void_list_node (void_type_node having been created). */
6833 build_void_list_node (void)
6835 tree t = build_tree_list (NULL_TREE, void_type_node);
6839 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6842 build_c_parm (struct c_declspecs *specs, tree attrs,
6843 struct c_declarator *declarator)
6845 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6848 ret->declarator = declarator;
6852 /* Return a declarator with nested attributes. TARGET is the inner
6853 declarator to which these attributes apply. ATTRS are the
6856 struct c_declarator *
6857 build_attrs_declarator (tree attrs, struct c_declarator *target)
6859 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6860 ret->kind = cdk_attrs;
6861 ret->declarator = target;
6862 ret->u.attrs = attrs;
6866 /* Return a declarator for a function with arguments specified by ARGS
6867 and return type specified by TARGET. */
6869 struct c_declarator *
6870 build_function_declarator (struct c_arg_info *args,
6871 struct c_declarator *target)
6873 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6874 ret->kind = cdk_function;
6875 ret->declarator = target;
6876 ret->u.arg_info = args;
6880 /* Return a declarator for the identifier IDENT (which may be
6881 NULL_TREE for an abstract declarator). */
6883 struct c_declarator *
6884 build_id_declarator (tree ident)
6886 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6888 ret->declarator = 0;
6890 /* Default value - may get reset to a more precise location. */
6891 ret->id_loc = input_location;
6895 /* Return something to represent absolute declarators containing a *.
6896 TARGET is the absolute declarator that the * contains.
6897 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6898 to apply to the pointer type. */
6900 struct c_declarator *
6901 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6902 struct c_declarator *target)
6906 struct c_declarator *itarget = target;
6907 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6908 if (type_quals_attrs)
6910 attrs = type_quals_attrs->attrs;
6911 quals = quals_from_declspecs (type_quals_attrs);
6912 if (attrs != NULL_TREE)
6913 itarget = build_attrs_declarator (attrs, target);
6915 ret->kind = cdk_pointer;
6916 ret->declarator = itarget;
6917 ret->u.pointer_quals = quals;
6921 /* Return a pointer to a structure for an empty list of declaration
6924 struct c_declspecs *
6925 build_null_declspecs (void)
6927 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6931 ret->typespec_word = cts_none;
6932 ret->storage_class = csc_none;
6933 ret->declspecs_seen_p = false;
6934 ret->type_seen_p = false;
6935 ret->non_sc_seen_p = false;
6936 ret->typedef_p = false;
6937 ret->tag_defined_p = false;
6938 ret->explicit_signed_p = false;
6939 ret->deprecated_p = false;
6940 ret->default_int_p = false;
6941 ret->long_p = false;
6942 ret->long_long_p = false;
6943 ret->short_p = false;
6944 ret->signed_p = false;
6945 ret->unsigned_p = false;
6946 ret->complex_p = false;
6947 ret->inline_p = false;
6948 ret->thread_p = false;
6949 ret->const_p = false;
6950 ret->volatile_p = false;
6951 ret->restrict_p = false;
6955 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6958 struct c_declspecs *
6959 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6963 specs->non_sc_seen_p = true;
6964 specs->declspecs_seen_p = true;
6965 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6966 && C_IS_RESERVED_WORD (qual));
6967 i = C_RID_CODE (qual);
6971 dupe = specs->const_p;
6972 specs->const_p = true;
6975 dupe = specs->volatile_p;
6976 specs->volatile_p = true;
6979 dupe = specs->restrict_p;
6980 specs->restrict_p = true;
6985 if (dupe && pedantic && !flag_isoc99)
6986 pedwarn ("duplicate %qE", qual);
6990 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6993 struct c_declspecs *
6994 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
6996 tree type = spec.spec;
6997 specs->non_sc_seen_p = true;
6998 specs->declspecs_seen_p = true;
6999 specs->type_seen_p = true;
7000 if (TREE_DEPRECATED (type))
7001 specs->deprecated_p = true;
7003 /* Handle type specifier keywords. */
7004 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
7006 enum rid i = C_RID_CODE (type);
7009 error ("two or more data types in declaration specifiers");
7012 if ((int) i <= (int) RID_LAST_MODIFIER)
7014 /* "long", "short", "signed", "unsigned" or "_Complex". */
7019 if (specs->long_long_p)
7021 error ("%<long long long%> is too long for GCC");
7026 if (specs->typespec_word == cts_double)
7028 error ("both %<long long%> and %<double%> in "
7029 "declaration specifiers");
7032 if (pedantic && !flag_isoc99 && !in_system_header
7034 pedwarn ("ISO C90 does not support %<long long%>");
7035 specs->long_long_p = 1;
7039 error ("both %<long%> and %<short%> in "
7040 "declaration specifiers");
7041 else if (specs->typespec_word == cts_void)
7042 error ("both %<long%> and %<void%> in "
7043 "declaration specifiers");
7044 else if (specs->typespec_word == cts_bool)
7045 error ("both %<long%> and %<_Bool%> in "
7046 "declaration specifiers");
7047 else if (specs->typespec_word == cts_char)
7048 error ("both %<long%> and %<char%> in "
7049 "declaration specifiers");
7050 else if (specs->typespec_word == cts_float)
7051 error ("both %<long%> and %<float%> in "
7052 "declaration specifiers");
7054 specs->long_p = true;
7057 dupe = specs->short_p;
7059 error ("both %<long%> and %<short%> in "
7060 "declaration specifiers");
7061 else if (specs->typespec_word == cts_void)
7062 error ("both %<short%> and %<void%> in "
7063 "declaration specifiers");
7064 else if (specs->typespec_word == cts_bool)
7065 error ("both %<short%> and %<_Bool%> in "
7066 "declaration specifiers");
7067 else if (specs->typespec_word == cts_char)
7068 error ("both %<short%> and %<char%> in "
7069 "declaration specifiers");
7070 else if (specs->typespec_word == cts_float)
7071 error ("both %<short%> and %<float%> in "
7072 "declaration specifiers");
7073 else if (specs->typespec_word == cts_double)
7074 error ("both %<short%> and %<double%> in "
7075 "declaration specifiers");
7077 specs->short_p = true;
7080 dupe = specs->signed_p;
7081 if (specs->unsigned_p)
7082 error ("both %<signed%> and %<unsigned%> in "
7083 "declaration specifiers");
7084 else if (specs->typespec_word == cts_void)
7085 error ("both %<signed%> and %<void%> in "
7086 "declaration specifiers");
7087 else if (specs->typespec_word == cts_bool)
7088 error ("both %<signed%> and %<_Bool%> in "
7089 "declaration specifiers");
7090 else if (specs->typespec_word == cts_float)
7091 error ("both %<signed%> and %<float%> in "
7092 "declaration specifiers");
7093 else if (specs->typespec_word == cts_double)
7094 error ("both %<signed%> and %<double%> in "
7095 "declaration specifiers");
7097 specs->signed_p = true;
7100 dupe = specs->unsigned_p;
7101 if (specs->signed_p)
7102 error ("both %<signed%> and %<unsigned%> in "
7103 "declaration specifiers");
7104 else if (specs->typespec_word == cts_void)
7105 error ("both %<unsigned%> and %<void%> in "
7106 "declaration specifiers");
7107 else if (specs->typespec_word == cts_bool)
7108 error ("both %<unsigned%> and %<_Bool%> in "
7109 "declaration specifiers");
7110 else if (specs->typespec_word == cts_float)
7111 error ("both %<unsigned%> and %<float%> in "
7112 "declaration specifiers");
7113 else if (specs->typespec_word == cts_double)
7114 error ("both %<unsigned%> and %<double%> in "
7115 "declaration specifiers");
7117 specs->unsigned_p = true;
7120 dupe = specs->complex_p;
7121 if (pedantic && !flag_isoc99 && !in_system_header)
7122 pedwarn ("ISO C90 does not support complex types");
7123 if (specs->typespec_word == cts_void)
7124 error ("both %<complex%> and %<void%> in "
7125 "declaration specifiers");
7126 else if (specs->typespec_word == cts_bool)
7127 error ("both %<complex%> and %<_Bool%> in "
7128 "declaration specifiers");
7130 specs->complex_p = true;
7137 error ("duplicate %qE", type);
7143 /* "void", "_Bool", "char", "int", "float" or "double". */
7144 if (specs->typespec_word != cts_none)
7146 error ("two or more data types in declaration specifiers");
7153 error ("both %<long%> and %<void%> in "
7154 "declaration specifiers");
7155 else if (specs->short_p)
7156 error ("both %<short%> and %<void%> in "
7157 "declaration specifiers");
7158 else if (specs->signed_p)
7159 error ("both %<signed%> and %<void%> in "
7160 "declaration specifiers");
7161 else if (specs->unsigned_p)
7162 error ("both %<unsigned%> and %<void%> in "
7163 "declaration specifiers");
7164 else if (specs->complex_p)
7165 error ("both %<complex%> and %<void%> in "
7166 "declaration specifiers");
7168 specs->typespec_word = cts_void;
7172 error ("both %<long%> and %<_Bool%> in "
7173 "declaration specifiers");
7174 else if (specs->short_p)
7175 error ("both %<short%> and %<_Bool%> in "
7176 "declaration specifiers");
7177 else if (specs->signed_p)
7178 error ("both %<signed%> and %<_Bool%> in "
7179 "declaration specifiers");
7180 else if (specs->unsigned_p)
7181 error ("both %<unsigned%> and %<_Bool%> in "
7182 "declaration specifiers");
7183 else if (specs->complex_p)
7184 error ("both %<complex%> and %<_Bool%> in "
7185 "declaration specifiers");
7187 specs->typespec_word = cts_bool;
7191 error ("both %<long%> and %<char%> in "
7192 "declaration specifiers");
7193 else if (specs->short_p)
7194 error ("both %<short%> and %<char%> in "
7195 "declaration specifiers");
7197 specs->typespec_word = cts_char;
7200 specs->typespec_word = cts_int;
7204 error ("both %<long%> and %<float%> in "
7205 "declaration specifiers");
7206 else if (specs->short_p)
7207 error ("both %<short%> and %<float%> in "
7208 "declaration specifiers");
7209 else if (specs->signed_p)
7210 error ("both %<signed%> and %<float%> in "
7211 "declaration specifiers");
7212 else if (specs->unsigned_p)
7213 error ("both %<unsigned%> and %<float%> in "
7214 "declaration specifiers");
7216 specs->typespec_word = cts_float;
7219 if (specs->long_long_p)
7220 error ("both %<long long%> and %<double%> in "
7221 "declaration specifiers");
7222 else if (specs->short_p)
7223 error ("both %<short%> and %<double%> in "
7224 "declaration specifiers");
7225 else if (specs->signed_p)
7226 error ("both %<signed%> and %<double%> in "
7227 "declaration specifiers");
7228 else if (specs->unsigned_p)
7229 error ("both %<unsigned%> and %<double%> in "
7230 "declaration specifiers");
7232 specs->typespec_word = cts_double;
7235 /* ObjC reserved word "id", handled below. */
7241 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7242 form of ObjC type, cases such as "int" and "long" being handled
7243 above), a TYPE (struct, union, enum and typeof specifiers) or an
7244 ERROR_MARK. In none of these cases may there have previously
7245 been any type specifiers. */
7246 if (specs->type || specs->typespec_word != cts_none
7247 || specs->long_p || specs->short_p || specs->signed_p
7248 || specs->unsigned_p || specs->complex_p)
7249 error ("two or more data types in declaration specifiers");
7250 else if (TREE_CODE (type) == TYPE_DECL)
7252 if (TREE_TYPE (type) == error_mark_node)
7253 ; /* Allow the type to default to int to avoid cascading errors. */
7256 specs->type = TREE_TYPE (type);
7257 specs->decl_attr = DECL_ATTRIBUTES (type);
7258 specs->typedef_p = true;
7259 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7262 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7264 tree t = lookup_name (type);
7265 if (!t || TREE_CODE (t) != TYPE_DECL)
7266 error ("%qE fails to be a typedef or built in type", type);
7267 else if (TREE_TYPE (t) == error_mark_node)
7270 specs->type = TREE_TYPE (t);
7272 else if (TREE_CODE (type) != ERROR_MARK)
7274 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7275 specs->tag_defined_p = true;
7276 if (spec.kind == ctsk_typeof)
7277 specs->typedef_p = true;
7284 /* Add the storage class specifier or function specifier SCSPEC to the
7285 declaration specifiers SPECS, returning SPECS. */
7287 struct c_declspecs *
7288 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7291 enum c_storage_class n = csc_none;
7293 specs->declspecs_seen_p = true;
7294 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7295 && C_IS_RESERVED_WORD (scspec));
7296 i = C_RID_CODE (scspec);
7297 if (extra_warnings && specs->non_sc_seen_p)
7298 warning (OPT_Wextra, "%qE is not at beginning of declaration", scspec);
7302 /* C99 permits duplicate inline. Although of doubtful utility,
7303 it seems simplest to permit it in gnu89 mode as well, as
7304 there is also little utility in maintaining this as a
7305 difference between gnu89 and C99 inline. */
7307 specs->inline_p = true;
7310 dupe = specs->thread_p;
7311 if (specs->storage_class == csc_auto)
7312 error ("%<__thread%> used with %<auto%>");
7313 else if (specs->storage_class == csc_register)
7314 error ("%<__thread%> used with %<register%>");
7315 else if (specs->storage_class == csc_typedef)
7316 error ("%<__thread%> used with %<typedef%>");
7318 specs->thread_p = true;
7325 /* Diagnose "__thread extern". */
7326 if (specs->thread_p)
7327 error ("%<__thread%> before %<extern%>");
7334 /* Diagnose "__thread static". */
7335 if (specs->thread_p)
7336 error ("%<__thread%> before %<static%>");
7344 if (n != csc_none && n == specs->storage_class)
7347 error ("duplicate %qE", scspec);
7350 if (specs->storage_class != csc_none && n != specs->storage_class)
7352 error ("multiple storage classes in declaration specifiers");
7356 specs->storage_class = n;
7357 if (n != csc_extern && n != csc_static && specs->thread_p)
7359 error ("%<__thread%> used with %qE", scspec);
7360 specs->thread_p = false;
7367 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7370 struct c_declspecs *
7371 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7373 specs->attrs = chainon (attrs, specs->attrs);
7374 specs->declspecs_seen_p = true;
7378 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7379 specifiers with any other type specifier to determine the resulting
7380 type. This is where ISO C checks on complex types are made, since
7381 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7384 struct c_declspecs *
7385 finish_declspecs (struct c_declspecs *specs)
7387 /* If a type was specified as a whole, we have no modifiers and are
7389 if (specs->type != NULL_TREE)
7391 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7392 && !specs->signed_p && !specs->unsigned_p
7393 && !specs->complex_p);
7397 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7398 has been specified, treat it as "int" unless "_Complex" is
7399 present and there are no other specifiers. If we just have
7400 "_Complex", it is equivalent to "_Complex double", but e.g.
7401 "_Complex short" is equivalent to "_Complex short int". */
7402 if (specs->typespec_word == cts_none)
7404 if (specs->long_p || specs->short_p
7405 || specs->signed_p || specs->unsigned_p)
7407 specs->typespec_word = cts_int;
7409 else if (specs->complex_p)
7411 specs->typespec_word = cts_double;
7413 pedwarn ("ISO C does not support plain %<complex%> meaning "
7414 "%<double complex%>");
7418 specs->typespec_word = cts_int;
7419 specs->default_int_p = true;
7420 /* We don't diagnose this here because grokdeclarator will
7421 give more specific diagnostics according to whether it is
7422 a function definition. */
7426 /* If "signed" was specified, record this to distinguish "int" and
7427 "signed int" in the case of a bit-field with
7428 -funsigned-bitfields. */
7429 specs->explicit_signed_p = specs->signed_p;
7431 /* Now compute the actual type. */
7432 switch (specs->typespec_word)
7435 gcc_assert (!specs->long_p && !specs->short_p
7436 && !specs->signed_p && !specs->unsigned_p
7437 && !specs->complex_p);
7438 specs->type = void_type_node;
7441 gcc_assert (!specs->long_p && !specs->short_p
7442 && !specs->signed_p && !specs->unsigned_p
7443 && !specs->complex_p);
7444 specs->type = boolean_type_node;
7447 gcc_assert (!specs->long_p && !specs->short_p);
7448 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7449 if (specs->signed_p)
7450 specs->type = signed_char_type_node;
7451 else if (specs->unsigned_p)
7452 specs->type = unsigned_char_type_node;
7454 specs->type = char_type_node;
7455 if (specs->complex_p)
7458 pedwarn ("ISO C does not support complex integer types");
7459 specs->type = build_complex_type (specs->type);
7463 gcc_assert (!(specs->long_p && specs->short_p));
7464 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7465 if (specs->long_long_p)
7466 specs->type = (specs->unsigned_p
7467 ? long_long_unsigned_type_node
7468 : long_long_integer_type_node);
7469 else if (specs->long_p)
7470 specs->type = (specs->unsigned_p
7471 ? long_unsigned_type_node
7472 : long_integer_type_node);
7473 else if (specs->short_p)
7474 specs->type = (specs->unsigned_p
7475 ? short_unsigned_type_node
7476 : short_integer_type_node);
7478 specs->type = (specs->unsigned_p
7479 ? unsigned_type_node
7480 : integer_type_node);
7481 if (specs->complex_p)
7484 pedwarn ("ISO C does not support complex integer types");
7485 specs->type = build_complex_type (specs->type);
7489 gcc_assert (!specs->long_p && !specs->short_p
7490 && !specs->signed_p && !specs->unsigned_p);
7491 specs->type = (specs->complex_p
7492 ? complex_float_type_node
7496 gcc_assert (!specs->long_long_p && !specs->short_p
7497 && !specs->signed_p && !specs->unsigned_p);
7500 specs->type = (specs->complex_p
7501 ? complex_long_double_type_node
7502 : long_double_type_node);
7506 specs->type = (specs->complex_p
7507 ? complex_double_type_node
7508 : double_type_node);
7518 /* Synthesize a function which calls all the global ctors or global
7519 dtors in this file. This is only used for targets which do not
7520 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7522 build_cdtor (int method_type, tree cdtors)
7529 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7530 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7533 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7536 /* Perform final processing on one file scope's declarations (or the
7537 external scope's declarations), GLOBALS. */
7539 c_write_global_declarations_1 (tree globals)
7541 size_t len = list_length (globals);
7542 tree *vec = XNEWVEC (tree, len);
7546 /* Process the decls in the order they were written. */
7547 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
7550 /* Check for used but undefined static functions using the C
7551 standard's definition of "used", and set TREE_NO_WARNING so
7552 that check_global_declarations doesn't repeat the check. */
7553 if (TREE_CODE (decl) == FUNCTION_DECL
7554 && DECL_INITIAL (decl) == 0
7555 && DECL_EXTERNAL (decl)
7556 && !TREE_PUBLIC (decl)
7557 && C_DECL_USED (decl))
7559 pedwarn ("%q+F used but never defined", decl);
7560 TREE_NO_WARNING (decl) = 1;
7564 wrapup_global_declarations (vec, len);
7565 check_global_declarations (vec, len);
7571 c_write_global_declarations (void)
7575 /* We don't want to do this if generating a PCH. */
7579 /* Don't waste time on further processing if -fsyntax-only or we've
7580 encountered errors. */
7581 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7584 /* Close the external scope. */
7585 ext_block = pop_scope ();
7587 gcc_assert (!current_scope);
7589 /* Process all file scopes in this compilation, and the external_scope,
7590 through wrapup_global_declarations and check_global_declarations. */
7591 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7592 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7595 tree tmp = BLOCK_VARS (ext_block);
7597 FILE * stream = dump_begin (TDI_tu, &flags);
7600 dump_node (tmp, flags & ~TDF_SLIM, stream);
7601 dump_end (TDI_tu, stream);
7604 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7606 /* Generate functions to call static constructors and destructors
7607 for targets that do not support .ctors/.dtors sections. These
7608 functions have magic names which are detected by collect2. */
7609 build_cdtor ('I', static_ctors); static_ctors = 0;
7610 build_cdtor ('D', static_dtors); static_dtors = 0;
7612 /* We're done parsing; proceed to optimize and emit assembly.
7613 FIXME: shouldn't be the front end's responsibility to call this. */
7617 #include "gt-c-decl.h"