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 (0, "declaration of %q+D shadows previous non-variable",
1915 else if (TREE_CODE (old_decl) == PARM_DECL)
1916 warning (0, "declaration of %q+D shadows a parameter", new_decl);
1917 else if (DECL_FILE_SCOPE_P (old_decl))
1918 warning (0, "declaration of %q+D shadows a global declaration",
1920 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1921 && DECL_BUILT_IN (old_decl))
1923 warning (0, "declaration of %q+D shadows a built-in function",
1928 warning (0, "declaration of %q+D shadows a previous local",
1931 warning (0, "%Jshadowed declaration is here", old_decl);
1938 /* Subroutine of pushdecl.
1940 X is a TYPE_DECL for a typedef statement. Create a brand new
1941 ..._TYPE node (which will be just a variant of the existing
1942 ..._TYPE node with identical properties) and then install X
1943 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1945 The whole point here is to end up with a situation where each
1946 and every ..._TYPE node the compiler creates will be uniquely
1947 associated with AT MOST one node representing a typedef name.
1948 This way, even though the compiler substitutes corresponding
1949 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1950 early on, later parts of the compiler can always do the reverse
1951 translation and get back the corresponding typedef name. For
1954 typedef struct S MY_TYPE;
1957 Later parts of the compiler might only know that `object' was of
1958 type `struct S' if it were not for code just below. With this
1959 code however, later parts of the compiler see something like:
1961 struct S' == struct S
1962 typedef struct S' MY_TYPE;
1965 And they can then deduce (from the node for type struct S') that
1966 the original object declaration was:
1970 Being able to do this is important for proper support of protoize,
1971 and also for generating precise symbolic debugging information
1972 which takes full account of the programmer's (typedef) vocabulary.
1974 Obviously, we don't want to generate a duplicate ..._TYPE node if
1975 the TYPE_DECL node that we are now processing really represents a
1976 standard built-in type.
1978 Since all standard types are effectively declared at line zero
1979 in the source file, we can easily check to see if we are working
1980 on a standard type by checking the current value of lineno. */
1983 clone_underlying_type (tree x)
1985 if (DECL_IS_BUILTIN (x))
1987 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1988 TYPE_NAME (TREE_TYPE (x)) = x;
1990 else if (TREE_TYPE (x) != error_mark_node
1991 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1993 tree tt = TREE_TYPE (x);
1994 DECL_ORIGINAL_TYPE (x) = tt;
1995 tt = build_variant_type_copy (tt);
1997 TREE_USED (tt) = TREE_USED (x);
2002 /* Record a decl-node X as belonging to the current lexical scope.
2003 Check for errors (such as an incompatible declaration for the same
2004 name already seen in the same scope).
2006 Returns either X or an old decl for the same name.
2007 If an old decl is returned, it may have been smashed
2008 to agree with what X says. */
2013 tree name = DECL_NAME (x);
2014 struct c_scope *scope = current_scope;
2015 struct c_binding *b;
2016 bool nested = false;
2018 /* Functions need the lang_decl data. */
2019 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
2020 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
2022 /* Must set DECL_CONTEXT for everything not at file scope or
2023 DECL_FILE_SCOPE_P won't work. Local externs don't count
2024 unless they have initializers (which generate code). */
2025 if (current_function_decl
2026 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2027 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2028 DECL_CONTEXT (x) = current_function_decl;
2030 /* If this is of variably modified type, prevent jumping into its
2032 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2033 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2034 c_begin_vm_scope (scope->depth);
2036 /* Anonymous decls are just inserted in the scope. */
2039 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
2043 /* First, see if there is another declaration with the same name in
2044 the current scope. If there is, duplicate_decls may do all the
2045 work for us. If duplicate_decls returns false, that indicates
2046 two incompatible decls in the same scope; we are to silently
2047 replace the old one (duplicate_decls has issued all appropriate
2048 diagnostics). In particular, we should not consider possible
2049 duplicates in the external scope, or shadowing. */
2050 b = I_SYMBOL_BINDING (name);
2051 if (b && B_IN_SCOPE (b, scope))
2053 struct c_binding *b_ext, *b_use;
2054 tree type = TREE_TYPE (x);
2055 tree visdecl = b->decl;
2056 tree vistype = TREE_TYPE (visdecl);
2057 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2058 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2059 b->inner_comp = false;
2062 /* If this is an external linkage declaration, we should check
2063 for compatibility with the type in the external scope before
2064 setting the type at this scope based on the visible
2065 information only. */
2066 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2068 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2069 b_ext = b_ext->shadowed;
2074 TREE_TYPE (b_use->decl) = b_use->type;
2077 if (duplicate_decls (x, b_use->decl))
2081 /* Save the updated type in the external scope and
2082 restore the proper type for this scope. */
2084 if (comptypes (vistype, type))
2085 thistype = composite_type (vistype, type);
2087 thistype = TREE_TYPE (b_use->decl);
2088 b_use->type = TREE_TYPE (b_use->decl);
2089 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2090 && DECL_BUILT_IN (b_use->decl))
2092 = build_type_attribute_variant (thistype,
2095 TREE_TYPE (b_use->decl) = thistype;
2100 goto skip_external_and_shadow_checks;
2103 /* All declarations with external linkage, and all external
2104 references, go in the external scope, no matter what scope is
2105 current. However, the binding in that scope is ignored for
2106 purposes of normal name lookup. A separate binding structure is
2107 created in the requested scope; this governs the normal
2108 visibility of the symbol.
2110 The binding in the externals scope is used exclusively for
2111 detecting duplicate declarations of the same object, no matter
2112 what scope they are in; this is what we do here. (C99 6.2.7p2:
2113 All declarations that refer to the same object or function shall
2114 have compatible type; otherwise, the behavior is undefined.) */
2115 if (DECL_EXTERNAL (x) || scope == file_scope)
2117 tree type = TREE_TYPE (x);
2120 bool type_saved = false;
2121 if (b && !B_IN_EXTERNAL_SCOPE (b)
2122 && (TREE_CODE (b->decl) == FUNCTION_DECL
2123 || TREE_CODE (b->decl) == VAR_DECL)
2124 && DECL_FILE_SCOPE_P (b->decl))
2127 vistype = TREE_TYPE (visdecl);
2129 if (scope != file_scope
2130 && !DECL_IN_SYSTEM_HEADER (x))
2131 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2133 while (b && !B_IN_EXTERNAL_SCOPE (b))
2135 /* If this decl might be modified, save its type. This is
2136 done here rather than when the decl is first bound
2137 because the type may change after first binding, through
2138 being completed or through attributes being added. If we
2139 encounter multiple such decls, only the first should have
2140 its type saved; the others will already have had their
2141 proper types saved and the types will not have changed as
2142 their scopes will not have been re-entered. */
2143 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2145 b->type = TREE_TYPE (b->decl);
2148 if (B_IN_FILE_SCOPE (b)
2149 && TREE_CODE (b->decl) == VAR_DECL
2150 && TREE_STATIC (b->decl)
2151 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2152 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2153 && TREE_CODE (type) == ARRAY_TYPE
2154 && TYPE_DOMAIN (type)
2155 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2156 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2158 /* Array type completed in inner scope, which should be
2159 diagnosed if the completion does not have size 1 and
2160 it does not get completed in the file scope. */
2161 b->inner_comp = true;
2166 /* If a matching external declaration has been found, set its
2167 type to the composite of all the types of that declaration.
2168 After the consistency checks, it will be reset to the
2169 composite of the visible types only. */
2170 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2172 TREE_TYPE (b->decl) = b->type;
2174 /* The point of the same_translation_unit_p check here is,
2175 we want to detect a duplicate decl for a construct like
2176 foo() { extern bar(); } ... static bar(); but not if
2177 they are in different translation units. In any case,
2178 the static does not go in the externals scope. */
2180 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2181 && duplicate_decls (x, b->decl))
2186 if (comptypes (vistype, type))
2187 thistype = composite_type (vistype, type);
2189 thistype = TREE_TYPE (b->decl);
2193 b->type = TREE_TYPE (b->decl);
2194 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2196 = build_type_attribute_variant (thistype,
2197 TYPE_ATTRIBUTES (b->type));
2198 TREE_TYPE (b->decl) = thistype;
2199 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2202 else if (TREE_PUBLIC (x))
2204 if (visdecl && !b && duplicate_decls (x, visdecl))
2206 /* An external declaration at block scope referring to a
2207 visible entity with internal linkage. The composite
2208 type will already be correct for this scope, so we
2209 just need to fall through to make the declaration in
2216 bind (name, x, external_scope, /*invisible=*/true,
2223 warn_if_shadowing (x);
2225 skip_external_and_shadow_checks:
2226 if (TREE_CODE (x) == TYPE_DECL)
2227 clone_underlying_type (x);
2229 bind (name, x, scope, /*invisible=*/false, nested);
2231 /* If x's type is incomplete because it's based on a
2232 structure or union which has not yet been fully declared,
2233 attach it to that structure or union type, so we can go
2234 back and complete the variable declaration later, if the
2235 structure or union gets fully declared.
2237 If the input is erroneous, we can have error_mark in the type
2238 slot (e.g. "f(void a, ...)") - that doesn't count as an
2240 if (TREE_TYPE (x) != error_mark_node
2241 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2243 tree element = TREE_TYPE (x);
2245 while (TREE_CODE (element) == ARRAY_TYPE)
2246 element = TREE_TYPE (element);
2247 element = TYPE_MAIN_VARIANT (element);
2249 if ((TREE_CODE (element) == RECORD_TYPE
2250 || TREE_CODE (element) == UNION_TYPE)
2251 && (TREE_CODE (x) != TYPE_DECL
2252 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2253 && !COMPLETE_TYPE_P (element))
2254 C_TYPE_INCOMPLETE_VARS (element)
2255 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2260 /* Record X as belonging to file scope.
2261 This is used only internally by the Objective-C front end,
2262 and is limited to its needs. duplicate_decls is not called;
2263 if there is any preexisting decl for this identifier, it is an ICE. */
2266 pushdecl_top_level (tree x)
2269 bool nested = false;
2270 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2272 name = DECL_NAME (x);
2274 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2276 if (TREE_PUBLIC (x))
2278 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2282 bind (name, x, file_scope, /*invisible=*/false, nested);
2288 implicit_decl_warning (tree id, tree olddecl)
2290 void (*diag) (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
2291 switch (mesg_implicit_function_declaration)
2294 case 1: diag = warning0; break;
2295 case 2: diag = error; break;
2296 default: gcc_unreachable ();
2299 diag (G_("implicit declaration of function %qE"), id);
2301 locate_old_decl (olddecl, diag);
2304 /* Generate an implicit declaration for identifier FUNCTIONID as a
2305 function of type int (). */
2308 implicitly_declare (tree functionid)
2310 struct c_binding *b;
2314 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2316 if (B_IN_SCOPE (b, external_scope))
2325 if (decl == error_mark_node)
2328 /* FIXME: Objective-C has weird not-really-builtin functions
2329 which are supposed to be visible automatically. They wind up
2330 in the external scope because they're pushed before the file
2331 scope gets created. Catch this here and rebind them into the
2333 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2335 bind (functionid, decl, file_scope,
2336 /*invisible=*/false, /*nested=*/true);
2341 tree newtype = default_function_type;
2343 TREE_TYPE (decl) = b->type;
2344 /* Implicit declaration of a function already declared
2345 (somehow) in a different scope, or as a built-in.
2346 If this is the first time this has happened, warn;
2347 then recycle the old declaration but with the new type. */
2348 if (!C_DECL_IMPLICIT (decl))
2350 implicit_decl_warning (functionid, decl);
2351 C_DECL_IMPLICIT (decl) = 1;
2353 if (DECL_BUILT_IN (decl))
2355 newtype = build_type_attribute_variant (newtype,
2357 (TREE_TYPE (decl)));
2358 if (!comptypes (newtype, TREE_TYPE (decl)))
2360 warning (0, "incompatible implicit declaration of built-in"
2361 " function %qD", decl);
2362 newtype = TREE_TYPE (decl);
2367 if (!comptypes (newtype, TREE_TYPE (decl)))
2369 error ("incompatible implicit declaration of function %qD",
2371 locate_old_decl (decl, error);
2374 b->type = TREE_TYPE (decl);
2375 TREE_TYPE (decl) = newtype;
2376 bind (functionid, decl, current_scope,
2377 /*invisible=*/false, /*nested=*/true);
2382 /* Not seen before. */
2383 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2384 DECL_EXTERNAL (decl) = 1;
2385 TREE_PUBLIC (decl) = 1;
2386 C_DECL_IMPLICIT (decl) = 1;
2387 implicit_decl_warning (functionid, 0);
2388 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2390 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2392 /* C89 says implicit declarations are in the innermost block.
2393 So we record the decl in the standard fashion. */
2394 decl = pushdecl (decl);
2396 /* No need to call objc_check_decl here - it's a function type. */
2397 rest_of_decl_compilation (decl, 0, 0);
2399 /* Write a record describing this implicit function declaration
2400 to the prototypes file (if requested). */
2401 gen_aux_info_record (decl, 0, 1, 0);
2403 /* Possibly apply some default attributes to this implicit declaration. */
2404 decl_attributes (&decl, NULL_TREE, 0);
2409 /* Issue an error message for a reference to an undeclared variable
2410 ID, including a reference to a builtin outside of function-call
2411 context. Establish a binding of the identifier to error_mark_node
2412 in an appropriate scope, which will suppress further errors for the
2413 same identifier. The error message should be given location LOC. */
2415 undeclared_variable (tree id, location_t loc)
2417 static bool already = false;
2418 struct c_scope *scope;
2420 if (current_function_decl == 0)
2422 error ("%H%qE undeclared here (not in a function)", &loc, id);
2423 scope = current_scope;
2427 error ("%H%qE undeclared (first use in this function)", &loc, id);
2431 error ("%H(Each undeclared identifier is reported only once", &loc);
2432 error ("%Hfor each function it appears in.)", &loc);
2436 /* If we are parsing old-style parameter decls, current_function_decl
2437 will be nonnull but current_function_scope will be null. */
2438 scope = current_function_scope ? current_function_scope : current_scope;
2440 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2443 /* Subroutine of lookup_label, declare_label, define_label: construct a
2444 LABEL_DECL with all the proper frills. */
2447 make_label (tree name, location_t location)
2449 tree label = build_decl (LABEL_DECL, name, void_type_node);
2451 DECL_CONTEXT (label) = current_function_decl;
2452 DECL_MODE (label) = VOIDmode;
2453 DECL_SOURCE_LOCATION (label) = location;
2458 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2459 Create one if none exists so far for the current function.
2460 This is called when a label is used in a goto expression or
2461 has its address taken. */
2464 lookup_label (tree name)
2468 if (current_function_decl == 0)
2470 error ("label %qE referenced outside of any function", name);
2474 /* Use a label already defined or ref'd with this name, but not if
2475 it is inherited from a containing function and wasn't declared
2477 label = I_LABEL_DECL (name);
2478 if (label && (DECL_CONTEXT (label) == current_function_decl
2479 || C_DECLARED_LABEL_FLAG (label)))
2481 /* If the label has only been declared, update its apparent
2482 location to point here, for better diagnostics if it
2483 turns out not to have been defined. */
2484 if (!TREE_USED (label))
2485 DECL_SOURCE_LOCATION (label) = input_location;
2489 /* No label binding for that identifier; make one. */
2490 label = make_label (name, input_location);
2492 /* Ordinary labels go in the current function scope. */
2493 bind (name, label, current_function_scope,
2494 /*invisible=*/false, /*nested=*/false);
2498 /* Make a label named NAME in the current function, shadowing silently
2499 any that may be inherited from containing functions or containing
2500 scopes. This is called for __label__ declarations. */
2503 declare_label (tree name)
2505 struct c_binding *b = I_LABEL_BINDING (name);
2508 /* Check to make sure that the label hasn't already been declared
2510 if (b && B_IN_CURRENT_SCOPE (b))
2512 error ("duplicate label declaration %qE", name);
2513 locate_old_decl (b->decl, error);
2515 /* Just use the previous declaration. */
2519 label = make_label (name, input_location);
2520 C_DECLARED_LABEL_FLAG (label) = 1;
2522 /* Declared labels go in the current scope. */
2523 bind (name, label, current_scope,
2524 /*invisible=*/false, /*nested=*/false);
2528 /* Define a label, specifying the location in the source file.
2529 Return the LABEL_DECL node for the label, if the definition is valid.
2530 Otherwise return 0. */
2533 define_label (location_t location, tree name)
2535 /* Find any preexisting label with this name. It is an error
2536 if that label has already been defined in this function, or
2537 if there is a containing function with a declared label with
2539 tree label = I_LABEL_DECL (name);
2540 struct c_label_list *nlist_se, *nlist_vm;
2543 && ((DECL_CONTEXT (label) == current_function_decl
2544 && DECL_INITIAL (label) != 0)
2545 || (DECL_CONTEXT (label) != current_function_decl
2546 && C_DECLARED_LABEL_FLAG (label))))
2548 error ("%Hduplicate label %qD", &location, label);
2549 locate_old_decl (label, error);
2552 else if (label && DECL_CONTEXT (label) == current_function_decl)
2554 /* The label has been used or declared already in this function,
2555 but not defined. Update its location to point to this
2557 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2558 error ("%Jjump into statement expression", label);
2559 if (C_DECL_UNDEFINABLE_VM (label))
2560 error ("%Jjump into scope of identifier with variably modified type",
2562 DECL_SOURCE_LOCATION (label) = location;
2566 /* No label binding for that identifier; make one. */
2567 label = make_label (name, location);
2569 /* Ordinary labels go in the current function scope. */
2570 bind (name, label, current_function_scope,
2571 /*invisible=*/false, /*nested=*/false);
2574 if (!in_system_header && lookup_name (name))
2575 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2576 "for labels, identifier %qE conflicts", &location, name);
2578 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2579 nlist_se->next = label_context_stack_se->labels_def;
2580 nlist_se->label = label;
2581 label_context_stack_se->labels_def = nlist_se;
2583 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2584 nlist_vm->next = label_context_stack_vm->labels_def;
2585 nlist_vm->label = label;
2586 label_context_stack_vm->labels_def = nlist_vm;
2588 /* Mark label as having been defined. */
2589 DECL_INITIAL (label) = error_mark_node;
2593 /* Given NAME, an IDENTIFIER_NODE,
2594 return the structure (or union or enum) definition for that name.
2595 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2596 CODE says which kind of type the caller wants;
2597 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2598 If the wrong kind of type is found, an error is reported. */
2601 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2603 struct c_binding *b = I_TAG_BINDING (name);
2609 /* We only care about whether it's in this level if
2610 thislevel_only was set or it might be a type clash. */
2611 if (thislevel_only || TREE_CODE (b->decl) != code)
2613 /* For our purposes, a tag in the external scope is the same as
2614 a tag in the file scope. (Primarily relevant to Objective-C
2615 and its builtin structure tags, which get pushed before the
2616 file scope is created.) */
2617 if (B_IN_CURRENT_SCOPE (b)
2618 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2622 if (thislevel_only && !thislevel)
2625 if (TREE_CODE (b->decl) != code)
2627 /* Definition isn't the kind we were looking for. */
2628 pending_invalid_xref = name;
2629 pending_invalid_xref_location = input_location;
2631 /* If in the same binding level as a declaration as a tag
2632 of a different type, this must not be allowed to
2633 shadow that tag, so give the error immediately.
2634 (For example, "struct foo; union foo;" is invalid.) */
2636 pending_xref_error ();
2641 /* Print an error message now
2642 for a recent invalid struct, union or enum cross reference.
2643 We don't print them immediately because they are not invalid
2644 when used in the `struct foo;' construct for shadowing. */
2647 pending_xref_error (void)
2649 if (pending_invalid_xref != 0)
2650 error ("%H%qE defined as wrong kind of tag",
2651 &pending_invalid_xref_location, pending_invalid_xref);
2652 pending_invalid_xref = 0;
2656 /* Look up NAME in the current scope and its superiors
2657 in the namespace of variables, functions and typedefs.
2658 Return a ..._DECL node of some kind representing its definition,
2659 or return 0 if it is undefined. */
2662 lookup_name (tree name)
2664 struct c_binding *b = I_SYMBOL_BINDING (name);
2665 if (b && !b->invisible)
2670 /* Similar to `lookup_name' but look only at the indicated scope. */
2673 lookup_name_in_scope (tree name, struct c_scope *scope)
2675 struct c_binding *b;
2677 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2678 if (B_IN_SCOPE (b, scope))
2683 /* Create the predefined scalar types of C,
2684 and some nodes representing standard constants (0, 1, (void *) 0).
2685 Initialize the global scope.
2686 Make definitions for built-in primitive functions. */
2689 c_init_decl_processing (void)
2691 location_t save_loc = input_location;
2693 /* Initialize reserved words for parser. */
2696 current_function_decl = 0;
2698 gcc_obstack_init (&parser_obstack);
2700 /* Make the externals scope. */
2702 external_scope = current_scope;
2704 /* Declarations from c_common_nodes_and_builtins must not be associated
2705 with this input file, lest we get differences between using and not
2706 using preprocessed headers. */
2707 #ifdef USE_MAPPED_LOCATION
2708 input_location = BUILTINS_LOCATION;
2710 input_location.file = "<built-in>";
2711 input_location.line = 0;
2714 build_common_tree_nodes (flag_signed_char, false);
2716 c_common_nodes_and_builtins ();
2718 /* In C, comparisons and TRUTH_* expressions have type int. */
2719 truthvalue_type_node = integer_type_node;
2720 truthvalue_true_node = integer_one_node;
2721 truthvalue_false_node = integer_zero_node;
2723 /* Even in C99, which has a real boolean type. */
2724 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2725 boolean_type_node));
2727 input_location = save_loc;
2729 pedantic_lvalues = true;
2731 make_fname_decl = c_make_fname_decl;
2732 start_fname_decls ();
2735 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2736 decl, NAME is the initialization string and TYPE_DEP indicates whether
2737 NAME depended on the type of the function. As we don't yet implement
2738 delayed emission of static data, we mark the decl as emitted
2739 so it is not placed in the output. Anything using it must therefore pull
2740 out the STRING_CST initializer directly. FIXME. */
2743 c_make_fname_decl (tree id, int type_dep)
2745 const char *name = fname_as_string (type_dep);
2746 tree decl, type, init;
2747 size_t length = strlen (name);
2749 type = build_array_type (char_type_node,
2750 build_index_type (size_int (length)));
2751 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2753 decl = build_decl (VAR_DECL, id, type);
2755 TREE_STATIC (decl) = 1;
2756 TREE_READONLY (decl) = 1;
2757 DECL_ARTIFICIAL (decl) = 1;
2759 init = build_string (length + 1, name);
2760 free ((char *) name);
2761 TREE_TYPE (init) = type;
2762 DECL_INITIAL (decl) = init;
2764 TREE_USED (decl) = 1;
2766 if (current_function_decl)
2768 DECL_CONTEXT (decl) = current_function_decl;
2769 bind (id, decl, current_function_scope,
2770 /*invisible=*/false, /*nested=*/false);
2773 finish_decl (decl, init, NULL_TREE);
2778 /* Return a definition for a builtin function named NAME and whose data type
2779 is TYPE. TYPE should be a function type with argument types.
2780 FUNCTION_CODE tells later passes how to compile calls to this function.
2781 See tree.h for its possible values.
2783 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2784 the name to be called if we can't opencode the function. If
2785 ATTRS is nonzero, use that for the function's attribute list. */
2788 builtin_function (const char *name, tree type, int function_code,
2789 enum built_in_class cl, const char *library_name,
2792 tree id = get_identifier (name);
2793 tree decl = build_decl (FUNCTION_DECL, id, type);
2794 TREE_PUBLIC (decl) = 1;
2795 DECL_EXTERNAL (decl) = 1;
2796 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2797 DECL_BUILT_IN_CLASS (decl) = cl;
2798 DECL_FUNCTION_CODE (decl) = function_code;
2799 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2801 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2803 /* Should never be called on a symbol with a preexisting meaning. */
2804 gcc_assert (!I_SYMBOL_BINDING (id));
2806 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2808 /* Builtins in the implementation namespace are made visible without
2809 needing to be explicitly declared. See push_file_scope. */
2810 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2812 TREE_CHAIN (decl) = visible_builtins;
2813 visible_builtins = decl;
2816 /* Possibly apply some default attributes to this built-in function. */
2818 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2820 decl_attributes (&decl, NULL_TREE, 0);
2825 /* Called when a declaration is seen that contains no names to declare.
2826 If its type is a reference to a structure, union or enum inherited
2827 from a containing scope, shadow that tag name for the current scope
2828 with a forward reference.
2829 If its type defines a new named structure or union
2830 or defines an enum, it is valid but we need not do anything here.
2831 Otherwise, it is an error. */
2834 shadow_tag (const struct c_declspecs *declspecs)
2836 shadow_tag_warned (declspecs, 0);
2839 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2842 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2844 bool found_tag = false;
2846 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2848 tree value = declspecs->type;
2849 enum tree_code code = TREE_CODE (value);
2851 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2852 /* Used to test also that TYPE_SIZE (value) != 0.
2853 That caused warning for `struct foo;' at top level in the file. */
2855 tree name = TYPE_NAME (value);
2862 if (warned != 1 && code != ENUMERAL_TYPE)
2863 /* Empty unnamed enum OK */
2865 pedwarn ("unnamed struct/union that defines no instances");
2869 else if (!declspecs->tag_defined_p
2870 && declspecs->storage_class != csc_none)
2873 pedwarn ("empty declaration with storage class specifier "
2874 "does not redeclare tag");
2876 pending_xref_error ();
2878 else if (!declspecs->tag_defined_p
2879 && (declspecs->const_p
2880 || declspecs->volatile_p
2881 || declspecs->restrict_p))
2884 pedwarn ("empty declaration with type qualifier "
2885 "does not redeclare tag");
2887 pending_xref_error ();
2891 pending_invalid_xref = 0;
2892 t = lookup_tag (code, name, 1);
2896 t = make_node (code);
2903 if (warned != 1 && !in_system_header)
2905 pedwarn ("useless type name in empty declaration");
2910 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2912 pedwarn ("useless type name in empty declaration");
2916 pending_invalid_xref = 0;
2918 if (declspecs->inline_p)
2920 error ("%<inline%> in empty declaration");
2924 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2926 error ("%<auto%> in file-scope empty declaration");
2930 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2932 error ("%<register%> in file-scope empty declaration");
2936 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2938 warning (0, "useless storage class specifier in empty declaration");
2942 if (!warned && !in_system_header && declspecs->thread_p)
2944 warning (0, "useless %<__thread%> in empty declaration");
2948 if (!warned && !in_system_header && (declspecs->const_p
2949 || declspecs->volatile_p
2950 || declspecs->restrict_p))
2952 warning (0, "useless type qualifier in empty declaration");
2959 pedwarn ("empty declaration");
2964 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2965 bits. SPECS represents declaration specifiers that the grammar
2966 only permits to contain type qualifiers and attributes. */
2969 quals_from_declspecs (const struct c_declspecs *specs)
2971 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2972 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2973 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2974 gcc_assert (!specs->type
2975 && !specs->decl_attr
2976 && specs->typespec_word == cts_none
2977 && specs->storage_class == csc_none
2978 && !specs->typedef_p
2979 && !specs->explicit_signed_p
2980 && !specs->deprecated_p
2982 && !specs->long_long_p
2985 && !specs->unsigned_p
2986 && !specs->complex_p
2988 && !specs->thread_p);
2992 /* Construct an array declarator. EXPR is the expression inside [], or
2993 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2994 to the pointer to which a parameter array is converted). STATIC_P is
2995 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2996 is true if the array is [*], a VLA of unspecified length which is
2997 nevertheless a complete type (not currently implemented by GCC),
2998 false otherwise. The field for the contained declarator is left to be
2999 filled in by set_array_declarator_inner. */
3001 struct c_declarator *
3002 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3005 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3006 struct c_declarator);
3007 declarator->kind = cdk_array;
3008 declarator->declarator = 0;
3009 declarator->u.array.dimen = expr;
3012 declarator->u.array.attrs = quals->attrs;
3013 declarator->u.array.quals = quals_from_declspecs (quals);
3017 declarator->u.array.attrs = NULL_TREE;
3018 declarator->u.array.quals = 0;
3020 declarator->u.array.static_p = static_p;
3021 declarator->u.array.vla_unspec_p = vla_unspec_p;
3022 if (pedantic && !flag_isoc99)
3024 if (static_p || quals != NULL)
3025 pedwarn ("ISO C90 does not support %<static%> or type "
3026 "qualifiers in parameter array declarators");
3028 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3031 warning (0, "GCC does not yet properly implement %<[*]%> array declarators");
3035 /* Set the contained declarator of an array declarator. DECL is the
3036 declarator, as constructed by build_array_declarator; INNER is what
3037 appears on the left of the []. ABSTRACT_P is true if it is an
3038 abstract declarator, false otherwise; this is used to reject static
3039 and type qualifiers in abstract declarators, where they are not in
3040 the C99 grammar (subject to possible change in DR#289). */
3042 struct c_declarator *
3043 set_array_declarator_inner (struct c_declarator *decl,
3044 struct c_declarator *inner, bool abstract_p)
3046 decl->declarator = inner;
3047 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
3048 || decl->u.array.attrs != NULL_TREE
3049 || decl->u.array.static_p))
3050 error ("static or type qualifiers in abstract declarator");
3054 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3057 groktypename (struct c_type_name *type_name)
3060 tree attrs = type_name->specs->attrs;
3062 type_name->specs->attrs = NULL_TREE;
3064 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3067 /* Apply attributes. */
3068 decl_attributes (&type, attrs, 0);
3073 /* Decode a declarator in an ordinary declaration or data definition.
3074 This is called as soon as the type information and variable name
3075 have been parsed, before parsing the initializer if any.
3076 Here we create the ..._DECL node, fill in its type,
3077 and put it on the list of decls for the current context.
3078 The ..._DECL node is returned as the value.
3080 Exception: for arrays where the length is not specified,
3081 the type is left null, to be filled in by `finish_decl'.
3083 Function definitions do not come here; they go to start_function
3084 instead. However, external and forward declarations of functions
3085 do go through here. Structure field declarations are done by
3086 grokfield and not through here. */
3089 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3090 bool initialized, tree attributes)
3095 /* An object declared as __attribute__((deprecated)) suppresses
3096 warnings of uses of other deprecated items. */
3097 if (lookup_attribute ("deprecated", attributes))
3098 deprecated_state = DEPRECATED_SUPPRESS;
3100 decl = grokdeclarator (declarator, declspecs,
3101 NORMAL, initialized, NULL);
3105 deprecated_state = DEPRECATED_NORMAL;
3107 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3108 && MAIN_NAME_P (DECL_NAME (decl)))
3109 warning (OPT_Wmain, "%q+D is usually a function", decl);
3112 /* Is it valid for this decl to have an initializer at all?
3113 If not, set INITIALIZED to zero, which will indirectly
3114 tell 'finish_decl' to ignore the initializer once it is parsed. */
3115 switch (TREE_CODE (decl))
3118 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3123 error ("function %qD is initialized like a variable", decl);
3128 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3129 error ("parameter %qD is initialized", decl);
3134 /* Don't allow initializations for incomplete types except for
3135 arrays which might be completed by the initialization. */
3137 /* This can happen if the array size is an undefined macro.
3138 We already gave a warning, so we don't need another one. */
3139 if (TREE_TYPE (decl) == error_mark_node)
3141 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3143 /* A complete type is ok if size is fixed. */
3145 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3146 || C_DECL_VARIABLE_SIZE (decl))
3148 error ("variable-sized object may not be initialized");
3152 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3154 error ("variable %qD has initializer but incomplete type", decl);
3157 else if (C_DECL_VARIABLE_SIZE (decl))
3159 /* Although C99 is unclear about whether incomplete arrays
3160 of VLAs themselves count as VLAs, it does not make
3161 sense to permit them to be initialized given that
3162 ordinary VLAs may not be initialized. */
3163 error ("variable-sized object may not be initialized");
3170 if (current_scope == file_scope)
3171 TREE_STATIC (decl) = 1;
3173 /* Tell 'pushdecl' this is an initialized decl
3174 even though we don't yet have the initializer expression.
3175 Also tell 'finish_decl' it may store the real initializer. */
3176 DECL_INITIAL (decl) = error_mark_node;
3179 /* If this is a function declaration, write a record describing it to the
3180 prototypes file (if requested). */
3182 if (TREE_CODE (decl) == FUNCTION_DECL)
3183 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3185 /* ANSI specifies that a tentative definition which is not merged with
3186 a non-tentative definition behaves exactly like a definition with an
3187 initializer equal to zero. (Section 3.7.2)
3189 -fno-common gives strict ANSI behavior, though this tends to break
3190 a large body of code that grew up without this rule.
3192 Thread-local variables are never common, since there's no entrenched
3193 body of code to break, and it allows more efficient variable references
3194 in the presence of dynamic linking. */
3196 if (TREE_CODE (decl) == VAR_DECL
3198 && TREE_PUBLIC (decl)
3199 && !DECL_THREAD_LOCAL_P (decl)
3201 DECL_COMMON (decl) = 1;
3203 /* Set attributes here so if duplicate decl, will have proper attributes. */
3204 decl_attributes (&decl, attributes, 0);
3206 if (TREE_CODE (decl) == FUNCTION_DECL
3207 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3209 struct c_declarator *ce = declarator;
3211 if (ce->kind == cdk_pointer)
3212 ce = declarator->declarator;
3213 if (ce->kind == cdk_function)
3215 tree args = ce->u.arg_info->parms;
3216 for (; args; args = TREE_CHAIN (args))
3218 tree type = TREE_TYPE (args);
3219 if (type && INTEGRAL_TYPE_P (type)
3220 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3221 DECL_ARG_TYPE (args) = integer_type_node;
3226 if (TREE_CODE (decl) == FUNCTION_DECL
3227 && DECL_DECLARED_INLINE_P (decl)
3228 && DECL_UNINLINABLE (decl)
3229 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3230 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3233 /* Add this decl to the current scope.
3234 TEM may equal DECL or it may be a previous decl of the same name. */
3235 tem = pushdecl (decl);
3237 if (initialized && DECL_EXTERNAL (tem))
3239 DECL_EXTERNAL (tem) = 0;
3240 TREE_STATIC (tem) = 1;
3246 /* Finish processing of a declaration;
3247 install its initial value.
3248 If the length of an array type is not known before,
3249 it must be determined now, from the initial value, or it is an error. */
3252 finish_decl (tree decl, tree init, tree asmspec_tree)
3254 tree type = TREE_TYPE (decl);
3255 int was_incomplete = (DECL_SIZE (decl) == 0);
3256 const char *asmspec = 0;
3258 /* If a name was specified, get the string. */
3259 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3260 && DECL_FILE_SCOPE_P (decl))
3261 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3263 asmspec = TREE_STRING_POINTER (asmspec_tree);
3265 /* If `start_decl' didn't like having an initialization, ignore it now. */
3266 if (init != 0 && DECL_INITIAL (decl) == 0)
3269 /* Don't crash if parm is initialized. */
3270 if (TREE_CODE (decl) == PARM_DECL)
3274 store_init_value (decl, init);
3276 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3277 || TREE_CODE (decl) == FUNCTION_DECL
3278 || TREE_CODE (decl) == FIELD_DECL))
3279 objc_check_decl (decl);
3281 /* Deduce size of array from initialization, if not already known. */
3282 if (TREE_CODE (type) == ARRAY_TYPE
3283 && TYPE_DOMAIN (type) == 0
3284 && TREE_CODE (decl) != TYPE_DECL)
3287 = (TREE_STATIC (decl)
3288 /* Even if pedantic, an external linkage array
3289 may have incomplete type at first. */
3290 ? pedantic && !TREE_PUBLIC (decl)
3291 : !DECL_EXTERNAL (decl));
3293 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3296 /* Get the completed type made by complete_array_type. */
3297 type = TREE_TYPE (decl);
3302 error ("initializer fails to determine size of %q+D", decl);
3307 error ("array size missing in %q+D", decl);
3308 /* If a `static' var's size isn't known,
3309 make it extern as well as static, so it does not get
3311 If it is not `static', then do not mark extern;
3312 finish_incomplete_decl will give it a default size
3313 and it will get allocated. */
3314 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3315 DECL_EXTERNAL (decl) = 1;
3319 error ("zero or negative size array %q+D", decl);
3323 /* For global variables, update the copy of the type that
3324 exists in the binding. */
3325 if (TREE_PUBLIC (decl))
3327 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3328 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3329 b_ext = b_ext->shadowed;
3333 b_ext->type = composite_type (b_ext->type, type);
3344 if (DECL_INITIAL (decl))
3345 TREE_TYPE (DECL_INITIAL (decl)) = type;
3347 layout_decl (decl, 0);
3350 if (TREE_CODE (decl) == VAR_DECL)
3352 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3353 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3354 layout_decl (decl, 0);
3356 if (DECL_SIZE (decl) == 0
3357 /* Don't give an error if we already gave one earlier. */
3358 && TREE_TYPE (decl) != error_mark_node
3359 && (TREE_STATIC (decl)
3360 /* A static variable with an incomplete type
3361 is an error if it is initialized.
3362 Also if it is not file scope.
3363 Otherwise, let it through, but if it is not `extern'
3364 then it may cause an error message later. */
3365 ? (DECL_INITIAL (decl) != 0
3366 || !DECL_FILE_SCOPE_P (decl))
3367 /* An automatic variable with an incomplete type
3369 : !DECL_EXTERNAL (decl)))
3371 error ("storage size of %q+D isn%'t known", decl);
3372 TREE_TYPE (decl) = error_mark_node;
3375 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3376 && DECL_SIZE (decl) != 0)
3378 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3379 constant_expression_warning (DECL_SIZE (decl));
3381 error ("storage size of %q+D isn%'t constant", decl);
3384 if (TREE_USED (type))
3385 TREE_USED (decl) = 1;
3388 /* If this is a function and an assembler name is specified, reset DECL_RTL
3389 so we can give it its new name. Also, update built_in_decls if it
3390 was a normal built-in. */
3391 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3393 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3394 set_builtin_user_assembler_name (decl, asmspec);
3395 set_user_assembler_name (decl, asmspec);
3398 /* If #pragma weak was used, mark the decl weak now. */
3399 maybe_apply_pragma_weak (decl);
3401 /* If this is a variable definition, determine its ELF visibility. */
3402 if (TREE_CODE (decl) == VAR_DECL
3403 && TREE_STATIC (decl)
3404 && !DECL_EXTERNAL (decl))
3405 c_determine_visibility (decl);
3407 /* Output the assembler code and/or RTL code for variables and functions,
3408 unless the type is an undefined structure or union.
3409 If not, it will get done when the type is completed. */
3411 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3413 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3414 if (c_dialect_objc ())
3415 objc_check_decl (decl);
3419 /* If this is not a static variable, issue a warning.
3420 It doesn't make any sense to give an ASMSPEC for an
3421 ordinary, non-register local variable. Historically,
3422 GCC has accepted -- but ignored -- the ASMSPEC in
3424 if (!DECL_FILE_SCOPE_P (decl)
3425 && TREE_CODE (decl) == VAR_DECL
3426 && !C_DECL_REGISTER (decl)
3427 && !TREE_STATIC (decl))
3428 warning (0, "ignoring asm-specifier for non-static local "
3429 "variable %q+D", decl);
3430 else if (C_DECL_REGISTER (decl))
3431 change_decl_assembler_name (decl, get_identifier (asmspec));
3433 set_user_assembler_name (decl, asmspec);
3436 if (DECL_FILE_SCOPE_P (decl))
3438 if (DECL_INITIAL (decl) == NULL_TREE
3439 || DECL_INITIAL (decl) == error_mark_node)
3440 /* Don't output anything
3441 when a tentative file-scope definition is seen.
3442 But at end of compilation, do output code for them. */
3443 DECL_DEFER_OUTPUT (decl) = 1;
3444 rest_of_decl_compilation (decl, true, 0);
3448 /* In conjunction with an ASMSPEC, the `register'
3449 keyword indicates that we should place the variable
3450 in a particular register. */
3451 if (asmspec && C_DECL_REGISTER (decl))
3453 DECL_HARD_REGISTER (decl) = 1;
3454 /* This cannot be done for a structure with volatile
3455 fields, on which DECL_REGISTER will have been
3457 if (!DECL_REGISTER (decl))
3458 error ("cannot put object with volatile field into register");
3461 if (TREE_CODE (decl) != FUNCTION_DECL)
3463 /* If we're building a variable sized type, and we might be
3464 reachable other than via the top of the current binding
3465 level, then create a new BIND_EXPR so that we deallocate
3466 the object at the right time. */
3467 /* Note that DECL_SIZE can be null due to errors. */
3468 if (DECL_SIZE (decl)
3469 && !TREE_CONSTANT (DECL_SIZE (decl))
3470 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3473 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3474 TREE_SIDE_EFFECTS (bind) = 1;
3476 BIND_EXPR_BODY (bind) = push_stmt_list ();
3478 add_stmt (build_stmt (DECL_EXPR, decl));
3483 if (!DECL_FILE_SCOPE_P (decl))
3485 /* Recompute the RTL of a local array now
3486 if it used to be an incomplete type. */
3488 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3490 /* If we used it already as memory, it must stay in memory. */
3491 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3492 /* If it's still incomplete now, no init will save it. */
3493 if (DECL_SIZE (decl) == 0)
3494 DECL_INITIAL (decl) = 0;
3499 /* If this was marked 'used', be sure it will be output. */
3500 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3501 mark_decl_referenced (decl);
3503 if (TREE_CODE (decl) == TYPE_DECL)
3505 if (!DECL_FILE_SCOPE_P (decl)
3506 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3507 add_stmt (build_stmt (DECL_EXPR, decl));
3509 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3512 /* At the end of a declaration, throw away any variable type sizes
3513 of types defined inside that declaration. There is no use
3514 computing them in the following function definition. */
3515 if (current_scope == file_scope)
3516 get_pending_sizes ();
3518 /* Install a cleanup (aka destructor) if one was given. */
3519 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3521 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3524 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3525 tree cleanup_decl = lookup_name (cleanup_id);
3528 /* Build "cleanup(&decl)" for the destructor. */
3529 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3530 cleanup = build_tree_list (NULL_TREE, cleanup);
3531 cleanup = build_function_call (cleanup_decl, cleanup);
3533 /* Don't warn about decl unused; the cleanup uses it. */
3534 TREE_USED (decl) = 1;
3535 TREE_USED (cleanup_decl) = 1;
3537 /* Initialize EH, if we've been told to do so. */
3538 if (flag_exceptions && !c_eh_initialized_p)
3540 c_eh_initialized_p = true;
3541 eh_personality_libfunc
3542 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3543 ? "__gcc_personality_sj0"
3544 : "__gcc_personality_v0");
3545 default_init_unwind_resume_libfunc ();
3546 using_eh_for_cleanups ();
3549 push_cleanup (decl, cleanup, false);
3554 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3557 grokparm (const struct c_parm *parm)
3559 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3562 decl_attributes (&decl, parm->attrs, 0);
3567 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3568 and push that on the current scope. */
3571 push_parm_decl (const struct c_parm *parm)
3575 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3576 decl_attributes (&decl, parm->attrs, 0);
3578 decl = pushdecl (decl);
3580 finish_decl (decl, NULL_TREE, NULL_TREE);
3583 /* Mark all the parameter declarations to date as forward decls.
3584 Also diagnose use of this extension. */
3587 mark_forward_parm_decls (void)
3589 struct c_binding *b;
3591 if (pedantic && !current_scope->warned_forward_parm_decls)
3593 pedwarn ("ISO C forbids forward parameter declarations");
3594 current_scope->warned_forward_parm_decls = true;
3597 for (b = current_scope->bindings; b; b = b->prev)
3598 if (TREE_CODE (b->decl) == PARM_DECL)
3599 TREE_ASM_WRITTEN (b->decl) = 1;
3602 static GTY(()) int compound_literal_number;
3604 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3605 literal, which may be an incomplete array type completed by the
3606 initializer; INIT is a CONSTRUCTOR that initializes the compound
3610 build_compound_literal (tree type, tree init)
3612 /* We do not use start_decl here because we have a type, not a declarator;
3613 and do not use finish_decl because the decl should be stored inside
3614 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3619 if (type == error_mark_node)
3620 return error_mark_node;
3622 decl = build_decl (VAR_DECL, NULL_TREE, type);
3623 DECL_EXTERNAL (decl) = 0;
3624 TREE_PUBLIC (decl) = 0;
3625 TREE_STATIC (decl) = (current_scope == file_scope);
3626 DECL_CONTEXT (decl) = current_function_decl;
3627 TREE_USED (decl) = 1;
3628 TREE_TYPE (decl) = type;
3629 TREE_READONLY (decl) = TYPE_READONLY (type);
3630 store_init_value (decl, init);
3632 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3634 int failure = complete_array_type (&TREE_TYPE (decl),
3635 DECL_INITIAL (decl), true);
3636 gcc_assert (!failure);
3638 type = TREE_TYPE (decl);
3639 TREE_TYPE (DECL_INITIAL (decl)) = type;
3642 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3643 return error_mark_node;
3645 stmt = build_stmt (DECL_EXPR, decl);
3646 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3647 TREE_SIDE_EFFECTS (complit) = 1;
3649 layout_decl (decl, 0);
3651 if (TREE_STATIC (decl))
3653 /* This decl needs a name for the assembler output. We also need
3654 a unique suffix to be added to the name. */
3657 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3658 compound_literal_number);
3659 compound_literal_number++;
3660 DECL_NAME (decl) = get_identifier (name);
3661 DECL_DEFER_OUTPUT (decl) = 1;
3662 DECL_COMDAT (decl) = 1;
3663 DECL_ARTIFICIAL (decl) = 1;
3664 DECL_IGNORED_P (decl) = 1;
3666 rest_of_decl_compilation (decl, 1, 0);
3672 /* Determine whether TYPE is a structure with a flexible array member,
3673 or a union containing such a structure (possibly recursively). */
3676 flexible_array_type_p (tree type)
3679 switch (TREE_CODE (type))
3682 x = TYPE_FIELDS (type);
3685 while (TREE_CHAIN (x) != NULL_TREE)
3687 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3688 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3689 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3690 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3694 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3696 if (flexible_array_type_p (TREE_TYPE (x)))
3705 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3706 replacing with appropriate values if they are invalid. */
3708 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3711 unsigned int max_width;
3712 unsigned HOST_WIDE_INT w;
3713 const char *name = orig_name ? orig_name: _("<anonymous>");
3715 /* Detect and ignore out of range field width and process valid
3717 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3718 || TREE_CODE (*width) != INTEGER_CST)
3720 error ("bit-field %qs width not an integer constant", name);
3721 *width = integer_one_node;
3725 constant_expression_warning (*width);
3726 if (tree_int_cst_sgn (*width) < 0)
3728 error ("negative width in bit-field %qs", name);
3729 *width = integer_one_node;
3731 else if (integer_zerop (*width) && orig_name)
3733 error ("zero width for bit-field %qs", name);
3734 *width = integer_one_node;
3738 /* Detect invalid bit-field type. */
3739 if (TREE_CODE (*type) != INTEGER_TYPE
3740 && TREE_CODE (*type) != BOOLEAN_TYPE
3741 && TREE_CODE (*type) != ENUMERAL_TYPE)
3743 error ("bit-field %qs has invalid type", name);
3744 *type = unsigned_type_node;
3747 type_mv = TYPE_MAIN_VARIANT (*type);
3749 && type_mv != integer_type_node
3750 && type_mv != unsigned_type_node
3751 && type_mv != boolean_type_node)
3752 pedwarn ("type of bit-field %qs is a GCC extension", name);
3754 if (type_mv == boolean_type_node)
3755 max_width = CHAR_TYPE_SIZE;
3757 max_width = TYPE_PRECISION (*type);
3759 if (0 < compare_tree_int (*width, max_width))
3761 error ("width of %qs exceeds its type", name);
3763 *width = build_int_cst (NULL_TREE, w);
3766 w = tree_low_cst (*width, 1);
3768 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3770 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3772 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3773 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3774 warning (0, "%qs is narrower than values of its type", name);
3778 /* Build a bit-field integer type for the given WIDTH and UNSIGNEDP. */
3780 c_build_bitfield_integer_type (unsigned HOST_WIDE_INT width, int unsignedp)
3782 /* Extended integer types of the same width as a standard type have
3783 lesser rank, so those of the same width as int promote to int or
3784 unsigned int and are valid for printf formats expecting int or
3785 unsigned int. To avoid such special cases, avoid creating
3786 extended integer types for bit-fields if a standard integer type
3788 if (width == TYPE_PRECISION (integer_type_node))
3789 return unsignedp ? unsigned_type_node : integer_type_node;
3790 if (width == TYPE_PRECISION (signed_char_type_node))
3791 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3792 if (width == TYPE_PRECISION (short_integer_type_node))
3793 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3794 if (width == TYPE_PRECISION (long_integer_type_node))
3795 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3796 if (width == TYPE_PRECISION (long_long_integer_type_node))
3797 return (unsignedp ? long_long_unsigned_type_node
3798 : long_long_integer_type_node);
3799 return build_nonstandard_integer_type (width, unsignedp);
3802 /* Given declspecs and a declarator,
3803 determine the name and type of the object declared
3804 and construct a ..._DECL node for it.
3805 (In one case we can return a ..._TYPE node instead.
3806 For invalid input we sometimes return 0.)
3808 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3810 DECL_CONTEXT says which syntactic context this declaration is in:
3811 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3812 FUNCDEF for a function definition. Like NORMAL but a few different
3813 error messages in each case. Return value may be zero meaning
3814 this definition is too screwy to try to parse.
3815 PARM for a parameter declaration (either within a function prototype
3816 or before a function body). Make a PARM_DECL, or return void_type_node.
3817 TYPENAME if for a typename (in a cast or sizeof).
3818 Don't make a DECL node; just return the ..._TYPE node.
3819 FIELD for a struct or union field; make a FIELD_DECL.
3820 INITIALIZED is true if the decl has an initializer.
3821 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3822 representing the width of the bit-field.
3824 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3825 It may also be so in the PARM case, for a prototype where the
3826 argument type is specified but not the name.
3828 This function is where the complicated C meanings of `static'
3829 and `extern' are interpreted. */
3832 grokdeclarator (const struct c_declarator *declarator,
3833 struct c_declspecs *declspecs,
3834 enum decl_context decl_context, bool initialized, tree *width)
3836 tree type = declspecs->type;
3837 bool threadp = declspecs->thread_p;
3838 enum c_storage_class storage_class = declspecs->storage_class;
3842 int type_quals = TYPE_UNQUALIFIED;
3843 const char *name, *orig_name;
3844 tree typedef_type = 0;
3845 int funcdef_flag = 0;
3846 bool funcdef_syntax = false;
3847 int size_varies = 0;
3848 tree decl_attr = declspecs->decl_attr;
3849 int array_ptr_quals = TYPE_UNQUALIFIED;
3850 tree array_ptr_attrs = NULL_TREE;
3851 int array_parm_static = 0;
3852 tree returned_attrs = NULL_TREE;
3853 bool bitfield = width != NULL;
3855 struct c_arg_info *arg_info = 0;
3857 if (decl_context == FUNCDEF)
3858 funcdef_flag = 1, decl_context = NORMAL;
3860 /* Look inside a declarator for the name being declared
3861 and get it as a string, for an error message. */
3863 const struct c_declarator *decl = declarator;
3872 funcdef_syntax = (decl->kind == cdk_function);
3873 decl = decl->declarator;
3877 decl = decl->declarator;
3882 name = IDENTIFIER_POINTER (decl->u.id);
3894 /* A function definition's declarator must have the form of
3895 a function declarator. */
3897 if (funcdef_flag && !funcdef_syntax)
3900 /* If this looks like a function definition, make it one,
3901 even if it occurs where parms are expected.
3902 Then store_parm_decls will reject it and not use it as a parm. */
3903 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3904 decl_context = PARM;
3906 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3907 warn_deprecated_use (declspecs->type);
3909 typedef_type = type;
3910 size_varies = C_TYPE_VARIABLE_SIZE (type);
3912 /* Diagnose defaulting to "int". */
3914 if (declspecs->default_int_p && !in_system_header)
3916 /* Issue a warning if this is an ISO C 99 program or if
3917 -Wreturn-type and this is a function, or if -Wimplicit;
3918 prefer the former warning since it is more explicit. */
3919 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3921 warn_about_return_type = 1;
3922 else if (warn_implicit_int || flag_isoc99)
3923 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3926 /* Adjust the type if a bit-field is being declared,
3927 -funsigned-bitfields applied and the type is not explicitly
3929 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
3930 && TREE_CODE (type) == INTEGER_TYPE)
3931 type = c_common_unsigned_type (type);
3933 /* Figure out the type qualifiers for the declaration. There are
3934 two ways a declaration can become qualified. One is something
3935 like `const int i' where the `const' is explicit. Another is
3936 something like `typedef const int CI; CI i' where the type of the
3937 declaration contains the `const'. A third possibility is that
3938 there is a type qualifier on the element type of a typedefed
3939 array type, in which case we should extract that qualifier so
3940 that c_apply_type_quals_to_decls receives the full list of
3941 qualifiers to work with (C90 is not entirely clear about whether
3942 duplicate qualifiers should be diagnosed in this case, but it
3943 seems most appropriate to do so). */
3944 element_type = strip_array_types (type);
3945 constp = declspecs->const_p + TYPE_READONLY (element_type);
3946 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
3947 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
3948 if (pedantic && !flag_isoc99)
3951 pedwarn ("duplicate %<const%>");
3953 pedwarn ("duplicate %<restrict%>");
3955 pedwarn ("duplicate %<volatile%>");
3957 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
3958 type = TYPE_MAIN_VARIANT (type);
3959 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3960 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3961 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3963 /* Warn about storage classes that are invalid for certain
3964 kinds of declarations (parameters, typenames, etc.). */
3968 || storage_class == csc_auto
3969 || storage_class == csc_register
3970 || storage_class == csc_typedef))
3972 if (storage_class == csc_auto
3973 && (pedantic || current_scope == file_scope))
3974 pedwarn ("function definition declared %<auto%>");
3975 if (storage_class == csc_register)
3976 error ("function definition declared %<register%>");
3977 if (storage_class == csc_typedef)
3978 error ("function definition declared %<typedef%>");
3980 error ("function definition declared %<__thread%>");
3982 if (storage_class == csc_auto
3983 || storage_class == csc_register
3984 || storage_class == csc_typedef)
3985 storage_class = csc_none;
3987 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
3989 if (decl_context == PARM && storage_class == csc_register)
3993 switch (decl_context)
3996 error ("storage class specified for structure field %qs",
4000 error ("storage class specified for parameter %qs", name);
4003 error ("storage class specified for typename");
4006 storage_class = csc_none;
4010 else if (storage_class == csc_extern
4014 /* 'extern' with initialization is invalid if not at file scope. */
4015 if (current_scope == file_scope)
4016 warning (0, "%qs initialized and declared %<extern%>", name);
4018 error ("%qs has both %<extern%> and initializer", name);
4020 else if (current_scope == file_scope)
4022 if (storage_class == csc_auto)
4023 error ("file-scope declaration of %qs specifies %<auto%>", name);
4024 if (pedantic && storage_class == csc_register)
4025 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
4029 if (storage_class == csc_extern && funcdef_flag)
4030 error ("nested function %qs declared %<extern%>", name);
4031 else if (threadp && storage_class == csc_none)
4033 error ("function-scope %qs implicitly auto and declared "
4040 /* Now figure out the structure of the declarator proper.
4041 Descend through it, creating more complex types, until we reach
4042 the declared identifier (or NULL_TREE, in an absolute declarator).
4043 At each stage we maintain an unqualified version of the type
4044 together with any qualifiers that should be applied to it with
4045 c_build_qualified_type; this way, array types including
4046 multidimensional array types are first built up in unqualified
4047 form and then the qualified form is created with
4048 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4050 while (declarator && declarator->kind != cdk_id)
4052 if (type == error_mark_node)
4054 declarator = declarator->declarator;
4058 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4059 a cdk_pointer (for *...),
4060 a cdk_function (for ...(...)),
4061 a cdk_attrs (for nested attributes),
4062 or a cdk_id (for the name being declared
4063 or the place in an absolute declarator
4064 where the name was omitted).
4065 For the last case, we have just exited the loop.
4067 At this point, TYPE is the type of elements of an array,
4068 or for a function to return, or for a pointer to point to.
4069 After this sequence of ifs, TYPE is the type of the
4070 array or function or pointer, and DECLARATOR has had its
4071 outermost layer removed. */
4073 if (array_ptr_quals != TYPE_UNQUALIFIED
4074 || array_ptr_attrs != NULL_TREE
4075 || array_parm_static)
4077 /* Only the innermost declarator (making a parameter be of
4078 array type which is converted to pointer type)
4079 may have static or type qualifiers. */
4080 error ("static or type qualifiers in non-parameter array declarator");
4081 array_ptr_quals = TYPE_UNQUALIFIED;
4082 array_ptr_attrs = NULL_TREE;
4083 array_parm_static = 0;
4086 switch (declarator->kind)
4090 /* A declarator with embedded attributes. */
4091 tree attrs = declarator->u.attrs;
4092 const struct c_declarator *inner_decl;
4094 declarator = declarator->declarator;
4095 inner_decl = declarator;
4096 while (inner_decl->kind == cdk_attrs)
4097 inner_decl = inner_decl->declarator;
4098 if (inner_decl->kind == cdk_id)
4099 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4100 else if (inner_decl->kind == cdk_function)
4101 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4102 else if (inner_decl->kind == cdk_array)
4103 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4104 returned_attrs = decl_attributes (&type,
4105 chainon (returned_attrs, attrs),
4111 tree itype = NULL_TREE;
4112 tree size = declarator->u.array.dimen;
4113 /* The index is a signed object `sizetype' bits wide. */
4114 tree index_type = c_common_signed_type (sizetype);
4116 array_ptr_quals = declarator->u.array.quals;
4117 array_ptr_attrs = declarator->u.array.attrs;
4118 array_parm_static = declarator->u.array.static_p;
4120 declarator = declarator->declarator;
4122 /* Check for some types that there cannot be arrays of. */
4124 if (VOID_TYPE_P (type))
4126 error ("declaration of %qs as array of voids", name);
4127 type = error_mark_node;
4130 if (TREE_CODE (type) == FUNCTION_TYPE)
4132 error ("declaration of %qs as array of functions", name);
4133 type = error_mark_node;
4136 if (pedantic && !in_system_header && flexible_array_type_p (type))
4137 pedwarn ("invalid use of structure with flexible array member");
4139 if (size == error_mark_node)
4140 type = error_mark_node;
4142 if (type == error_mark_node)
4145 /* If size was specified, set ITYPE to a range-type for
4146 that size. Otherwise, ITYPE remains null. finish_decl
4147 may figure it out from an initial value. */
4151 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4153 STRIP_TYPE_NOPS (size);
4155 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4157 error ("size of array %qs has non-integer type", name);
4158 size = integer_one_node;
4161 if (pedantic && integer_zerop (size))
4162 pedwarn ("ISO C forbids zero-size array %qs", name);
4164 if (TREE_CODE (size) == INTEGER_CST)
4166 constant_expression_warning (size);
4167 if (tree_int_cst_sgn (size) < 0)
4169 error ("size of array %qs is negative", name);
4170 size = integer_one_node;
4175 /* Make sure the array size remains visibly
4176 nonconstant even if it is (eg) a const variable
4177 with known value. */
4180 if (!flag_isoc99 && pedantic)
4182 if (TREE_CONSTANT (size))
4183 pedwarn ("ISO C90 forbids array %qs whose size "
4184 "can%'t be evaluated",
4187 pedwarn ("ISO C90 forbids variable-size array %qs",
4192 if (integer_zerop (size))
4194 /* A zero-length array cannot be represented with
4195 an unsigned index type, which is what we'll
4196 get with build_index_type. Create an
4197 open-ended range instead. */
4198 itype = build_range_type (sizetype, size, NULL_TREE);
4202 /* Arrange for the SAVE_EXPR on the inside of the
4203 MINUS_EXPR, which allows the -1 to get folded
4204 with the +1 that happens when building TYPE_SIZE. */
4206 size = variable_size (size);
4208 /* Compute the maximum valid index, that is, size
4209 - 1. Do the calculation in index_type, so that
4210 if it is a variable the computations will be
4211 done in the proper mode. */
4212 itype = fold_build2 (MINUS_EXPR, index_type,
4213 convert (index_type, size),
4214 convert (index_type,
4217 /* If that overflowed, the array is too big. ???
4218 While a size of INT_MAX+1 technically shouldn't
4219 cause an overflow (because we subtract 1), the
4220 overflow is recorded during the conversion to
4221 index_type, before the subtraction. Handling
4222 this case seems like an unnecessary
4224 if (TREE_CODE (itype) == INTEGER_CST
4225 && TREE_OVERFLOW (itype))
4227 error ("size of array %qs is too large", name);
4228 type = error_mark_node;
4232 itype = build_index_type (itype);
4235 else if (decl_context == FIELD)
4237 if (pedantic && !flag_isoc99 && !in_system_header)
4238 pedwarn ("ISO C90 does not support flexible array members");
4240 /* ISO C99 Flexible array members are effectively
4241 identical to GCC's zero-length array extension. */
4242 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4245 /* Complain about arrays of incomplete types. */
4246 if (!COMPLETE_TYPE_P (type))
4248 error ("array type has incomplete element type");
4249 type = error_mark_node;
4252 type = build_array_type (type, itype);
4255 C_TYPE_VARIABLE_SIZE (type) = 1;
4257 /* The GCC extension for zero-length arrays differs from
4258 ISO flexible array members in that sizeof yields
4260 if (size && integer_zerop (size))
4262 TYPE_SIZE (type) = bitsize_zero_node;
4263 TYPE_SIZE_UNIT (type) = size_zero_node;
4266 if (decl_context != PARM
4267 && (array_ptr_quals != TYPE_UNQUALIFIED
4268 || array_ptr_attrs != NULL_TREE
4269 || array_parm_static))
4271 error ("static or type qualifiers in non-parameter array declarator");
4272 array_ptr_quals = TYPE_UNQUALIFIED;
4273 array_ptr_attrs = NULL_TREE;
4274 array_parm_static = 0;
4280 /* Say it's a definition only for the declarator closest
4281 to the identifier, apart possibly from some
4283 bool really_funcdef = false;
4287 const struct c_declarator *t = declarator->declarator;
4288 while (t->kind == cdk_attrs)
4290 really_funcdef = (t->kind == cdk_id);
4293 /* Declaring a function type. Make sure we have a valid
4294 type for the function to return. */
4295 if (type == error_mark_node)
4300 /* Warn about some types functions can't return. */
4301 if (TREE_CODE (type) == FUNCTION_TYPE)
4303 error ("%qs declared as function returning a function", name);
4304 type = integer_type_node;
4306 if (TREE_CODE (type) == ARRAY_TYPE)
4308 error ("%qs declared as function returning an array", name);
4309 type = integer_type_node;
4312 /* Construct the function type and go to the next
4313 inner layer of declarator. */
4314 arg_info = declarator->u.arg_info;
4315 arg_types = grokparms (arg_info, really_funcdef);
4317 /* Type qualifiers before the return type of the function
4318 qualify the return type, not the function type. */
4321 /* Type qualifiers on a function return type are
4322 normally permitted by the standard but have no
4323 effect, so give a warning at -Wreturn-type.
4324 Qualifiers on a void return type are banned on
4325 function definitions in ISO C; GCC used to used
4326 them for noreturn functions. */
4327 if (VOID_TYPE_P (type) && really_funcdef)
4328 pedwarn ("function definition has qualified void return type");
4330 warning (OPT_Wreturn_type,
4331 "type qualifiers ignored on function return type");
4333 type = c_build_qualified_type (type, type_quals);
4335 type_quals = TYPE_UNQUALIFIED;
4337 type = build_function_type (type, arg_types);
4338 declarator = declarator->declarator;
4340 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4341 the formal parameter list of this FUNCTION_TYPE to point to
4342 the FUNCTION_TYPE node itself. */
4346 for (link = arg_info->tags;
4348 link = TREE_CHAIN (link))
4349 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4355 /* Merge any constancy or volatility into the target type
4358 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4360 pedwarn ("ISO C forbids qualified function types");
4362 type = c_build_qualified_type (type, type_quals);
4365 type = build_pointer_type (type);
4367 /* Process type qualifiers (such as const or volatile)
4368 that were given inside the `*'. */
4369 type_quals = declarator->u.pointer_quals;
4371 declarator = declarator->declarator;
4379 /* Now TYPE has the actual type, apart from any qualifiers in
4382 /* Check the type and width of a bit-field. */
4384 check_bitfield_type_and_width (&type, width, orig_name);
4386 /* Did array size calculations overflow? */
4388 if (TREE_CODE (type) == ARRAY_TYPE
4389 && COMPLETE_TYPE_P (type)
4390 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST
4391 && TREE_OVERFLOW (TYPE_SIZE (type)))
4393 error ("size of array %qs is too large", name);
4394 /* If we proceed with the array type as it is, we'll eventually
4395 crash in tree_low_cst(). */
4396 type = error_mark_node;
4399 /* If this is declaring a typedef name, return a TYPE_DECL. */
4401 if (storage_class == csc_typedef)
4404 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4406 pedwarn ("ISO C forbids qualified function types");
4408 type = c_build_qualified_type (type, type_quals);
4409 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4410 if (declspecs->explicit_signed_p)
4411 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4412 decl_attributes (&decl, returned_attrs, 0);
4413 if (declspecs->inline_p)
4414 pedwarn ("typedef %q+D declared %<inline%>", decl);
4418 /* Detect the case of an array type of unspecified size
4419 which came, as such, direct from a typedef name.
4420 We must copy the type, so that each identifier gets
4421 a distinct type, so that each identifier's size can be
4422 controlled separately by its own initializer. */
4424 if (type != 0 && typedef_type != 0
4425 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4426 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4428 type = build_array_type (TREE_TYPE (type), 0);
4430 C_TYPE_VARIABLE_SIZE (type) = 1;
4433 /* If this is a type name (such as, in a cast or sizeof),
4434 compute the type and return it now. */
4436 if (decl_context == TYPENAME)
4438 /* Note that the grammar rejects storage classes in typenames
4440 gcc_assert (storage_class == csc_none && !threadp
4441 && !declspecs->inline_p);
4442 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4444 pedwarn ("ISO C forbids const or volatile function types");
4446 type = c_build_qualified_type (type, type_quals);
4447 decl_attributes (&type, returned_attrs, 0);
4451 /* Aside from typedefs and type names (handle above),
4452 `void' at top level (not within pointer)
4453 is allowed only in public variables.
4454 We don't complain about parms either, but that is because
4455 a better error message can be made later. */
4457 if (VOID_TYPE_P (type) && decl_context != PARM
4458 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4459 && (storage_class == csc_extern
4460 || (current_scope == file_scope
4461 && !(storage_class == csc_static
4462 || storage_class == csc_register)))))
4464 error ("variable or field %qs declared void", name);
4465 type = integer_type_node;
4468 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4469 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4474 if (decl_context == PARM)
4476 tree type_as_written;
4479 /* A parameter declared as an array of T is really a pointer to T.
4480 One declared as a function is really a pointer to a function. */
4482 if (TREE_CODE (type) == ARRAY_TYPE)
4484 /* Transfer const-ness of array into that of type pointed to. */
4485 type = TREE_TYPE (type);
4487 type = c_build_qualified_type (type, type_quals);
4488 type = build_pointer_type (type);
4489 type_quals = array_ptr_quals;
4491 /* We don't yet implement attributes in this context. */
4492 if (array_ptr_attrs != NULL_TREE)
4493 warning (OPT_Wattributes,
4494 "attributes in parameter array declarator ignored");
4498 else if (TREE_CODE (type) == FUNCTION_TYPE)
4500 if (pedantic && type_quals)
4501 pedwarn ("ISO C forbids qualified function types");
4503 type = c_build_qualified_type (type, type_quals);
4504 type = build_pointer_type (type);
4505 type_quals = TYPE_UNQUALIFIED;
4507 else if (type_quals)
4508 type = c_build_qualified_type (type, type_quals);
4510 type_as_written = type;
4512 decl = build_decl (PARM_DECL, declarator->u.id, type);
4514 C_DECL_VARIABLE_SIZE (decl) = 1;
4516 /* Compute the type actually passed in the parmlist,
4517 for the case where there is no prototype.
4518 (For example, shorts and chars are passed as ints.)
4519 When there is a prototype, this is overridden later. */
4521 if (type == error_mark_node)
4522 promoted_type = type;
4524 promoted_type = c_type_promotes_to (type);
4526 DECL_ARG_TYPE (decl) = promoted_type;
4527 if (declspecs->inline_p)
4528 pedwarn ("parameter %q+D declared %<inline%>", decl);
4530 else if (decl_context == FIELD)
4532 /* Note that the grammar rejects storage classes in typenames
4534 gcc_assert (storage_class == csc_none && !threadp
4535 && !declspecs->inline_p);
4537 /* Structure field. It may not be a function. */
4539 if (TREE_CODE (type) == FUNCTION_TYPE)
4541 error ("field %qs declared as a function", name);
4542 type = build_pointer_type (type);
4544 else if (TREE_CODE (type) != ERROR_MARK
4545 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4547 error ("field %qs has incomplete type", name);
4548 type = error_mark_node;
4550 type = c_build_qualified_type (type, type_quals);
4551 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4552 DECL_NONADDRESSABLE_P (decl) = bitfield;
4555 C_DECL_VARIABLE_SIZE (decl) = 1;
4557 else if (TREE_CODE (type) == FUNCTION_TYPE)
4559 if (storage_class == csc_register || threadp)
4561 error ("invalid storage class for function %qs", name);
4563 else if (current_scope != file_scope)
4565 /* Function declaration not at file scope. Storage
4566 classes other than `extern' are not allowed, C99
4567 6.7.1p5, and `extern' makes no difference. However,
4568 GCC allows 'auto', perhaps with 'inline', to support
4569 nested functions. */
4570 if (storage_class == csc_auto)
4573 pedwarn ("invalid storage class for function %qs", name);
4575 else if (storage_class == csc_static)
4577 error ("invalid storage class for function %qs", name);
4579 storage_class = declspecs->storage_class = csc_none;
4585 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4586 decl = build_decl_attribute_variant (decl, decl_attr);
4588 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4590 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4591 pedwarn ("ISO C forbids qualified function types");
4593 /* GNU C interprets a volatile-qualified function type to indicate
4594 that the function does not return. */
4595 if ((type_quals & TYPE_QUAL_VOLATILE)
4596 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4597 warning (0, "%<noreturn%> function returns non-void value");
4599 /* Every function declaration is an external reference
4600 (DECL_EXTERNAL) except for those which are not at file
4601 scope and are explicitly declared "auto". This is
4602 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4603 GCC to signify a forward declaration of a nested function. */
4604 if (storage_class == csc_auto && current_scope != file_scope)
4605 DECL_EXTERNAL (decl) = 0;
4607 DECL_EXTERNAL (decl) = 1;
4609 /* Record absence of global scope for `static' or `auto'. */
4611 = !(storage_class == csc_static || storage_class == csc_auto);
4613 /* For a function definition, record the argument information
4614 block where store_parm_decls will look for it. */
4616 current_function_arg_info = arg_info;
4618 if (declspecs->default_int_p)
4619 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4621 /* Record presence of `inline', if it is reasonable. */
4622 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4624 if (declspecs->inline_p)
4625 pedwarn ("cannot inline function %<main%>");
4627 else if (declspecs->inline_p)
4629 /* Record that the function is declared `inline'. */
4630 DECL_DECLARED_INLINE_P (decl) = 1;
4632 /* Do not mark bare declarations as DECL_INLINE. Doing so
4633 in the presence of multiple declarations can result in
4634 the abstract origin pointing between the declarations,
4635 which will confuse dwarf2out. */
4638 DECL_INLINE (decl) = 1;
4639 if (storage_class == csc_extern)
4640 current_extern_inline = 1;
4643 /* If -finline-functions, assume it can be inlined. This does
4644 two things: let the function be deferred until it is actually
4645 needed, and let dwarf2 know that the function is inlinable. */
4646 else if (flag_inline_trees == 2 && initialized)
4647 DECL_INLINE (decl) = 1;
4651 /* It's a variable. */
4652 /* An uninitialized decl with `extern' is a reference. */
4653 int extern_ref = !initialized && storage_class == csc_extern;
4655 type = c_build_qualified_type (type, type_quals);
4657 /* C99 6.2.2p7: It is invalid (compile-time undefined
4658 behavior) to create an 'extern' declaration for a
4659 variable if there is a global declaration that is
4660 'static' and the global declaration is not visible.
4661 (If the static declaration _is_ currently visible,
4662 the 'extern' declaration is taken to refer to that decl.) */
4663 if (extern_ref && current_scope != file_scope)
4665 tree global_decl = identifier_global_value (declarator->u.id);
4666 tree visible_decl = lookup_name (declarator->u.id);
4669 && global_decl != visible_decl
4670 && TREE_CODE (global_decl) == VAR_DECL
4671 && !TREE_PUBLIC (global_decl))
4672 error ("variable previously declared %<static%> redeclared "
4676 decl = build_decl (VAR_DECL, declarator->u.id, type);
4677 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4679 C_DECL_VARIABLE_SIZE (decl) = 1;
4681 if (declspecs->inline_p)
4682 pedwarn ("variable %q+D declared %<inline%>", decl);
4684 /* At file scope, an initialized extern declaration may follow
4685 a static declaration. In that case, DECL_EXTERNAL will be
4686 reset later in start_decl. */
4687 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4689 /* At file scope, the presence of a `static' or `register' storage
4690 class specifier, or the absence of all storage class specifiers
4691 makes this declaration a definition (perhaps tentative). Also,
4692 the absence of both `static' and `register' makes it public. */
4693 if (current_scope == file_scope)
4695 TREE_PUBLIC (decl) = !(storage_class == csc_static
4696 || storage_class == csc_register);
4697 TREE_STATIC (decl) = !extern_ref;
4699 /* Not at file scope, only `static' makes a static definition. */
4702 TREE_STATIC (decl) = (storage_class == csc_static);
4703 TREE_PUBLIC (decl) = extern_ref;
4708 if (targetm.have_tls)
4709 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4711 /* A mere warning is sure to result in improper semantics
4712 at runtime. Don't bother to allow this to compile. */
4713 error ("thread-local storage not supported for this target");
4717 /* Record `register' declaration for warnings on &
4718 and in case doing stupid register allocation. */
4720 if (storage_class == csc_register)
4722 C_DECL_REGISTER (decl) = 1;
4723 DECL_REGISTER (decl) = 1;
4726 /* Record constancy and volatility. */
4727 c_apply_type_quals_to_decl (type_quals, decl);
4729 /* If a type has volatile components, it should be stored in memory.
4730 Otherwise, the fact that those components are volatile
4731 will be ignored, and would even crash the compiler.
4732 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4733 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4734 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4735 || TREE_CODE (decl) == RESULT_DECL))
4737 /* It is not an error for a structure with volatile fields to
4738 be declared register, but reset DECL_REGISTER since it
4739 cannot actually go in a register. */
4740 int was_reg = C_DECL_REGISTER (decl);
4741 C_DECL_REGISTER (decl) = 0;
4742 DECL_REGISTER (decl) = 0;
4743 c_mark_addressable (decl);
4744 C_DECL_REGISTER (decl) = was_reg;
4747 /* This is the earliest point at which we might know the assembler
4748 name of a variable. Thus, if it's known before this, die horribly. */
4749 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4751 decl_attributes (&decl, returned_attrs, 0);
4757 /* Decode the parameter-list info for a function type or function definition.
4758 The argument is the value returned by `get_parm_info' (or made in parse.y
4759 if there is an identifier list instead of a parameter decl list).
4760 These two functions are separate because when a function returns
4761 or receives functions then each is called multiple times but the order
4762 of calls is different. The last call to `grokparms' is always the one
4763 that contains the formal parameter names of a function definition.
4765 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4767 FUNCDEF_FLAG is true for a function definition, false for
4768 a mere declaration. A nonempty identifier-list gets an error message
4769 when FUNCDEF_FLAG is false. */
4772 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4774 tree arg_types = arg_info->types;
4776 if (arg_types == 0 && !funcdef_flag && !in_system_header)
4777 warning (OPT_Wstrict_prototypes,
4778 "function declaration isn%'t a prototype");
4780 if (arg_types == error_mark_node)
4781 return 0; /* don't set TYPE_ARG_TYPES in this case */
4783 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4786 pedwarn ("parameter names (without types) in function declaration");
4788 arg_info->parms = arg_info->types;
4789 arg_info->types = 0;
4794 tree parm, type, typelt;
4795 unsigned int parmno;
4797 /* If there is a parameter of incomplete type in a definition,
4798 this is an error. In a declaration this is valid, and a
4799 struct or union type may be completed later, before any calls
4800 or definition of the function. In the case where the tag was
4801 first declared within the parameter list, a warning has
4802 already been given. If a parameter has void type, then
4803 however the function cannot be defined or called, so
4806 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4808 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4810 type = TREE_VALUE (typelt);
4811 if (type == error_mark_node)
4814 if (!COMPLETE_TYPE_P (type))
4818 if (DECL_NAME (parm))
4819 error ("parameter %u (%q+D) has incomplete type",
4822 error ("%Jparameter %u has incomplete type",
4825 TREE_VALUE (typelt) = error_mark_node;
4826 TREE_TYPE (parm) = error_mark_node;
4828 else if (VOID_TYPE_P (type))
4830 if (DECL_NAME (parm))
4831 warning (0, "parameter %u (%q+D) has void type",
4834 warning (0, "%Jparameter %u has void type",
4843 /* Take apart the current scope and return a c_arg_info structure with
4844 info on a parameter list just parsed.
4846 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4848 ELLIPSIS being true means the argument list ended in '...' so don't
4849 append a sentinel (void_list_node) to the end of the type-list. */
4852 get_parm_info (bool ellipsis)
4854 struct c_binding *b = current_scope->bindings;
4855 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4862 static bool explained_incomplete_types = false;
4863 bool gave_void_only_once_err = false;
4865 arg_info->parms = 0;
4867 arg_info->types = 0;
4868 arg_info->others = 0;
4870 /* The bindings in this scope must not get put into a block.
4871 We will take care of deleting the binding nodes. */
4872 current_scope->bindings = 0;
4874 /* This function is only called if there was *something* on the
4878 /* A parameter list consisting solely of 'void' indicates that the
4879 function takes no arguments. But if the 'void' is qualified
4880 (by 'const' or 'volatile'), or has a storage class specifier
4881 ('register'), then the behavior is undefined; issue an error.
4882 Typedefs for 'void' are OK (see DR#157). */
4883 if (b->prev == 0 /* one binding */
4884 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4885 && !DECL_NAME (b->decl) /* anonymous */
4886 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4888 if (TREE_THIS_VOLATILE (b->decl)
4889 || TREE_READONLY (b->decl)
4890 || C_DECL_REGISTER (b->decl))
4891 error ("%<void%> as only parameter may not be qualified");
4893 /* There cannot be an ellipsis. */
4895 error ("%<void%> must be the only parameter");
4897 arg_info->types = void_list_node;
4902 types = void_list_node;
4904 /* Break up the bindings list into parms, tags, types, and others;
4905 apply sanity checks; purge the name-to-decl bindings. */
4908 tree decl = b->decl;
4909 tree type = TREE_TYPE (decl);
4910 const char *keyword;
4912 switch (TREE_CODE (decl))
4917 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4918 I_SYMBOL_BINDING (b->id) = b->shadowed;
4921 /* Check for forward decls that never got their actual decl. */
4922 if (TREE_ASM_WRITTEN (decl))
4923 error ("parameter %q+D has just a forward declaration", decl);
4924 /* Check for (..., void, ...) and issue an error. */
4925 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4927 if (!gave_void_only_once_err)
4929 error ("%<void%> must be the only parameter");
4930 gave_void_only_once_err = true;
4935 /* Valid parameter, add it to the list. */
4936 TREE_CHAIN (decl) = parms;
4939 /* Since there is a prototype, args are passed in their
4940 declared types. The back end may override this later. */
4941 DECL_ARG_TYPE (decl) = type;
4942 types = tree_cons (0, type, types);
4946 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4947 case UNION_TYPE: keyword = "union"; goto tag;
4948 case RECORD_TYPE: keyword = "struct"; goto tag;
4950 /* Types may not have tag-names, in which case the type
4951 appears in the bindings list with b->id NULL. */
4954 gcc_assert (I_TAG_BINDING (b->id) == b);
4955 I_TAG_BINDING (b->id) = b->shadowed;
4958 /* Warn about any struct, union or enum tags defined in a
4959 parameter list. The scope of such types is limited to
4960 the parameter list, which is rarely if ever desirable
4961 (it's impossible to call such a function with type-
4962 correct arguments). An anonymous union parm type is
4963 meaningful as a GNU extension, so don't warn for that. */
4964 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4967 /* The %s will be one of 'struct', 'union', or 'enum'. */
4968 warning (0, "%<%s %E%> declared inside parameter list",
4971 /* The %s will be one of 'struct', 'union', or 'enum'. */
4972 warning (0, "anonymous %s declared inside parameter list",
4975 if (!explained_incomplete_types)
4977 warning (0, "its scope is only this definition or declaration,"
4978 " which is probably not what you want");
4979 explained_incomplete_types = true;
4983 tags = tree_cons (b->id, decl, tags);
4989 /* CONST_DECLs appear here when we have an embedded enum,
4990 and TYPE_DECLs appear here when we have an embedded struct
4991 or union. No warnings for this - we already warned about the
4992 type itself. FUNCTION_DECLs appear when there is an implicit
4993 function declaration in the parameter list. */
4995 TREE_CHAIN (decl) = others;
5000 /* error_mark_node appears here when we have an undeclared
5001 variable. Just throw it away. */
5004 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5005 I_SYMBOL_BINDING (b->id) = b->shadowed;
5009 /* Other things that might be encountered. */
5016 b = free_binding_and_advance (b);
5019 arg_info->parms = parms;
5020 arg_info->tags = tags;
5021 arg_info->types = types;
5022 arg_info->others = others;
5026 /* Get the struct, enum or union (CODE says which) with tag NAME.
5027 Define the tag as a forward-reference if it is not defined.
5028 Return a c_typespec structure for the type specifier. */
5031 parser_xref_tag (enum tree_code code, tree name)
5033 struct c_typespec ret;
5034 /* If a cross reference is requested, look up the type
5035 already defined for this tag and return it. */
5037 tree ref = lookup_tag (code, name, 0);
5038 /* If this is the right type of tag, return what we found.
5039 (This reference will be shadowed by shadow_tag later if appropriate.)
5040 If this is the wrong type of tag, do not return it. If it was the
5041 wrong type in the same scope, we will have had an error
5042 message already; if in a different scope and declaring
5043 a name, pending_xref_error will give an error message; but if in a
5044 different scope and not declaring a name, this tag should
5045 shadow the previous declaration of a different type of tag, and
5046 this would not work properly if we return the reference found.
5047 (For example, with "struct foo" in an outer scope, "union foo;"
5048 must shadow that tag with a new one of union type.) */
5049 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5050 if (ref && TREE_CODE (ref) == code)
5056 /* If no such tag is yet defined, create a forward-reference node
5057 and record it as the "definition".
5058 When a real declaration of this type is found,
5059 the forward-reference will be altered into a real type. */
5061 ref = make_node (code);
5062 if (code == ENUMERAL_TYPE)
5064 /* Give the type a default layout like unsigned int
5065 to avoid crashing if it does not get defined. */
5066 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5067 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5068 TYPE_USER_ALIGN (ref) = 0;
5069 TYPE_UNSIGNED (ref) = 1;
5070 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5071 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5072 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5075 pushtag (name, ref);
5081 /* Get the struct, enum or union (CODE says which) with tag NAME.
5082 Define the tag as a forward-reference if it is not defined.
5083 Return a tree for the type. */
5086 xref_tag (enum tree_code code, tree name)
5088 return parser_xref_tag (code, name).spec;
5091 /* Make sure that the tag NAME is defined *in the current scope*
5092 at least as a forward reference.
5093 CODE says which kind of tag NAME ought to be. */
5096 start_struct (enum tree_code code, tree name)
5098 /* If there is already a tag defined at this scope
5099 (as a forward reference), just return it. */
5104 ref = lookup_tag (code, name, 1);
5105 if (ref && TREE_CODE (ref) == code)
5107 if (TYPE_SIZE (ref))
5109 if (code == UNION_TYPE)
5110 error ("redefinition of %<union %E%>", name);
5112 error ("redefinition of %<struct %E%>", name);
5114 else if (C_TYPE_BEING_DEFINED (ref))
5116 if (code == UNION_TYPE)
5117 error ("nested redefinition of %<union %E%>", name);
5119 error ("nested redefinition of %<struct %E%>", name);
5124 /* Otherwise create a forward-reference just so the tag is in scope. */
5126 ref = make_node (code);
5127 pushtag (name, ref);
5130 C_TYPE_BEING_DEFINED (ref) = 1;
5131 TYPE_PACKED (ref) = flag_pack_struct;
5135 /* Process the specs, declarator and width (NULL if omitted)
5136 of a structure component, returning a FIELD_DECL node.
5137 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5139 This is done during the parsing of the struct declaration.
5140 The FIELD_DECL nodes are chained together and the lot of them
5141 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5144 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5149 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5150 && width == NULL_TREE)
5152 /* This is an unnamed decl.
5154 If we have something of the form "union { list } ;" then this
5155 is the anonymous union extension. Similarly for struct.
5157 If this is something of the form "struct foo;", then
5158 If MS extensions are enabled, this is handled as an
5160 Otherwise this is a forward declaration of a structure tag.
5162 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5163 If MS extensions are enabled and foo names a structure, then
5164 again this is an anonymous struct.
5165 Otherwise this is an error.
5167 Oh what a horrid tangled web we weave. I wonder if MS consciously
5168 took this from Plan 9 or if it was an accident of implementation
5169 that took root before someone noticed the bug... */
5171 tree type = declspecs->type;
5172 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5173 || TREE_CODE (type) == UNION_TYPE);
5177 && (flag_ms_extensions || !declspecs->typedef_p))
5179 if (flag_ms_extensions)
5183 else if (TYPE_NAME (type) == NULL)
5190 pedwarn ("declaration does not declare anything");
5194 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5197 value = grokdeclarator (declarator, declspecs, FIELD, false,
5198 width ? &width : NULL);
5200 finish_decl (value, NULL_TREE, NULL_TREE);
5201 DECL_INITIAL (value) = width;
5206 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5207 the list such that this does not present a problem later. */
5210 detect_field_duplicates (tree fieldlist)
5215 /* First, see if there are more than "a few" fields.
5216 This is trivially true if there are zero or one fields. */
5219 x = TREE_CHAIN (fieldlist);
5225 } while (timeout > 0 && x);
5227 /* If there were "few" fields, avoid the overhead of allocating
5228 a hash table. Instead just do the nested traversal thing. */
5231 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5234 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5235 if (DECL_NAME (y) == DECL_NAME (x))
5237 error ("duplicate member %q+D", x);
5238 DECL_NAME (x) = NULL_TREE;
5244 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5247 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5248 if ((y = DECL_NAME (x)) != 0)
5250 slot = htab_find_slot (htab, y, INSERT);
5253 error ("duplicate member %q+D", x);
5254 DECL_NAME (x) = NULL_TREE;
5263 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5264 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5265 ATTRIBUTES are attributes to be applied to the structure. */
5268 finish_struct (tree t, tree fieldlist, tree attributes)
5271 bool toplevel = file_scope == current_scope;
5272 int saw_named_field;
5274 /* If this type was previously laid out as a forward reference,
5275 make sure we lay it out again. */
5279 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5283 for (x = fieldlist; x; x = TREE_CHAIN (x))
5284 if (DECL_NAME (x) != 0)
5289 if (TREE_CODE (t) == UNION_TYPE)
5292 pedwarn ("union has no named members");
5294 pedwarn ("union has no members");
5299 pedwarn ("struct has no named members");
5301 pedwarn ("struct has no members");
5306 /* Install struct as DECL_CONTEXT of each field decl.
5307 Also process specified field sizes, found in the DECL_INITIAL,
5308 storing 0 there after the type has been changed to precision equal
5309 to its width, rather than the precision of the specified standard
5310 type. (Correct layout requires the original type to have been preserved
5313 saw_named_field = 0;
5314 for (x = fieldlist; x; x = TREE_CHAIN (x))
5316 DECL_CONTEXT (x) = t;
5317 DECL_PACKED (x) |= TYPE_PACKED (t);
5319 /* If any field is const, the structure type is pseudo-const. */
5320 if (TREE_READONLY (x))
5321 C_TYPE_FIELDS_READONLY (t) = 1;
5324 /* A field that is pseudo-const makes the structure likewise. */
5325 tree t1 = TREE_TYPE (x);
5326 while (TREE_CODE (t1) == ARRAY_TYPE)
5327 t1 = TREE_TYPE (t1);
5328 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5329 && C_TYPE_FIELDS_READONLY (t1))
5330 C_TYPE_FIELDS_READONLY (t) = 1;
5333 /* Any field that is volatile means variables of this type must be
5334 treated in some ways as volatile. */
5335 if (TREE_THIS_VOLATILE (x))
5336 C_TYPE_FIELDS_VOLATILE (t) = 1;
5338 /* Any field of nominal variable size implies structure is too. */
5339 if (C_DECL_VARIABLE_SIZE (x))
5340 C_TYPE_VARIABLE_SIZE (t) = 1;
5342 if (DECL_INITIAL (x))
5344 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5345 DECL_SIZE (x) = bitsize_int (width);
5346 DECL_BIT_FIELD (x) = 1;
5347 SET_DECL_C_BIT_FIELD (x);
5350 /* Detect flexible array member in an invalid context. */
5351 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5352 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5353 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5354 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5356 if (TREE_CODE (t) == UNION_TYPE)
5358 error ("%Jflexible array member in union", x);
5359 TREE_TYPE (x) = error_mark_node;
5361 else if (TREE_CHAIN (x) != NULL_TREE)
5363 error ("%Jflexible array member not at end of struct", x);
5364 TREE_TYPE (x) = error_mark_node;
5366 else if (!saw_named_field)
5368 error ("%Jflexible array member in otherwise empty struct", x);
5369 TREE_TYPE (x) = error_mark_node;
5373 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5374 && flexible_array_type_p (TREE_TYPE (x)))
5375 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5378 saw_named_field = 1;
5381 detect_field_duplicates (fieldlist);
5383 /* Now we have the nearly final fieldlist. Record it,
5384 then lay out the structure or union (including the fields). */
5386 TYPE_FIELDS (t) = fieldlist;
5390 /* Give bit-fields their proper types. */
5392 tree *fieldlistp = &fieldlist;
5394 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5395 && TREE_TYPE (*fieldlistp) != error_mark_node)
5397 unsigned HOST_WIDE_INT width
5398 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5399 tree type = TREE_TYPE (*fieldlistp);
5400 if (width != TYPE_PRECISION (type))
5402 TREE_TYPE (*fieldlistp)
5403 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5404 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5406 DECL_INITIAL (*fieldlistp) = 0;
5409 fieldlistp = &TREE_CHAIN (*fieldlistp);
5412 /* Now we have the truly final field list.
5413 Store it in this type and in the variants. */
5415 TYPE_FIELDS (t) = fieldlist;
5417 /* If there are lots of fields, sort so we can look through them fast.
5418 We arbitrarily consider 16 or more elts to be "a lot". */
5423 for (x = fieldlist; x; x = TREE_CHAIN (x))
5425 if (len > 15 || DECL_NAME (x) == NULL)
5433 struct lang_type *space;
5434 struct sorted_fields_type *space2;
5436 len += list_length (x);
5438 /* Use the same allocation policy here that make_node uses, to
5439 ensure that this lives as long as the rest of the struct decl.
5440 All decls in an inline function need to be saved. */
5442 space = GGC_CNEW (struct lang_type);
5443 space2 = GGC_NEWVAR (struct sorted_fields_type,
5444 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5448 field_array = &space2->elts[0];
5449 for (x = fieldlist; x; x = TREE_CHAIN (x))
5451 field_array[len++] = x;
5453 /* If there is anonymous struct or union, break out of the loop. */
5454 if (DECL_NAME (x) == NULL)
5457 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5460 TYPE_LANG_SPECIFIC (t) = space;
5461 TYPE_LANG_SPECIFIC (t)->s->len = len;
5462 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5463 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5468 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5470 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5471 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5472 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5473 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5474 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5475 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5476 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5479 /* If this was supposed to be a transparent union, but we can't
5480 make it one, warn and turn off the flag. */
5481 if (TREE_CODE (t) == UNION_TYPE
5482 && TYPE_TRANSPARENT_UNION (t)
5483 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5485 TYPE_TRANSPARENT_UNION (t) = 0;
5486 warning (0, "union cannot be made transparent");
5489 /* If this structure or union completes the type of any previous
5490 variable declaration, lay it out and output its rtl. */
5491 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5495 tree decl = TREE_VALUE (x);
5496 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5497 layout_array_type (TREE_TYPE (decl));
5498 if (TREE_CODE (decl) != TYPE_DECL)
5500 layout_decl (decl, 0);
5501 if (c_dialect_objc ())
5502 objc_check_decl (decl);
5503 rest_of_decl_compilation (decl, toplevel, 0);
5508 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5510 /* Finish debugging output for this type. */
5511 rest_of_type_compilation (t, toplevel);
5513 /* If we're inside a function proper, i.e. not file-scope and not still
5514 parsing parameters, then arrange for the size of a variable sized type
5516 if (cur_stmt_list && variably_modified_type_p (t, NULL))
5517 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5522 /* Lay out the type T, and its element type, and so on. */
5525 layout_array_type (tree t)
5527 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5528 layout_array_type (TREE_TYPE (t));
5532 /* Begin compiling the definition of an enumeration type.
5533 NAME is its name (or null if anonymous).
5534 Returns the type object, as yet incomplete.
5535 Also records info about it so that build_enumerator
5536 may be used to declare the individual values as they are read. */
5539 start_enum (tree name)
5543 /* If this is the real definition for a previous forward reference,
5544 fill in the contents in the same object that used to be the
5545 forward reference. */
5548 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5550 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5552 enumtype = make_node (ENUMERAL_TYPE);
5553 pushtag (name, enumtype);
5556 if (C_TYPE_BEING_DEFINED (enumtype))
5557 error ("nested redefinition of %<enum %E%>", name);
5559 C_TYPE_BEING_DEFINED (enumtype) = 1;
5561 if (TYPE_VALUES (enumtype) != 0)
5563 /* This enum is a named one that has been declared already. */
5564 error ("redeclaration of %<enum %E%>", name);
5566 /* Completely replace its old definition.
5567 The old enumerators remain defined, however. */
5568 TYPE_VALUES (enumtype) = 0;
5571 enum_next_value = integer_zero_node;
5574 if (flag_short_enums)
5575 TYPE_PACKED (enumtype) = 1;
5580 /* After processing and defining all the values of an enumeration type,
5581 install their decls in the enumeration type and finish it off.
5582 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5583 and ATTRIBUTES are the specified attributes.
5584 Returns ENUMTYPE. */
5587 finish_enum (tree enumtype, tree values, tree attributes)
5590 tree minnode = 0, maxnode = 0;
5591 int precision, unsign;
5592 bool toplevel = (file_scope == current_scope);
5593 struct lang_type *lt;
5595 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5597 /* Calculate the maximum value of any enumerator in this type. */
5599 if (values == error_mark_node)
5600 minnode = maxnode = integer_zero_node;
5603 minnode = maxnode = TREE_VALUE (values);
5604 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5606 tree value = TREE_VALUE (pair);
5607 if (tree_int_cst_lt (maxnode, value))
5609 if (tree_int_cst_lt (value, minnode))
5614 /* Construct the final type of this enumeration. It is the same
5615 as one of the integral types - the narrowest one that fits, except
5616 that normally we only go as narrow as int - and signed iff any of
5617 the values are negative. */
5618 unsign = (tree_int_cst_sgn (minnode) >= 0);
5619 precision = MAX (min_precision (minnode, unsign),
5620 min_precision (maxnode, unsign));
5622 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5624 tem = c_common_type_for_size (precision, unsign);
5627 warning (0, "enumeration values exceed range of largest integer");
5628 tem = long_long_integer_type_node;
5632 tem = unsign ? unsigned_type_node : integer_type_node;
5634 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5635 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5636 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5637 TYPE_SIZE (enumtype) = 0;
5639 /* If the precision of the type was specific with an attribute and it
5640 was too small, give an error. Otherwise, use it. */
5641 if (TYPE_PRECISION (enumtype))
5643 if (precision > TYPE_PRECISION (enumtype))
5644 error ("specified mode too small for enumeral values");
5647 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5649 layout_type (enumtype);
5651 if (values != error_mark_node)
5653 /* Change the type of the enumerators to be the enum type. We
5654 need to do this irrespective of the size of the enum, for
5655 proper type checking. Replace the DECL_INITIALs of the
5656 enumerators, and the value slots of the list, with copies
5657 that have the enum type; they cannot be modified in place
5658 because they may be shared (e.g. integer_zero_node) Finally,
5659 change the purpose slots to point to the names of the decls. */
5660 for (pair = values; pair; pair = TREE_CHAIN (pair))
5662 tree enu = TREE_PURPOSE (pair);
5663 tree ini = DECL_INITIAL (enu);
5665 TREE_TYPE (enu) = enumtype;
5667 /* The ISO C Standard mandates enumerators to have type int,
5668 even though the underlying type of an enum type is
5669 unspecified. Here we convert any enumerators that fit in
5670 an int to type int, to avoid promotions to unsigned types
5671 when comparing integers with enumerators that fit in the
5672 int range. When -pedantic is given, build_enumerator()
5673 would have already taken care of those that don't fit. */
5674 if (int_fits_type_p (ini, integer_type_node))
5675 tem = integer_type_node;
5678 ini = convert (tem, ini);
5680 DECL_INITIAL (enu) = ini;
5681 TREE_PURPOSE (pair) = DECL_NAME (enu);
5682 TREE_VALUE (pair) = ini;
5685 TYPE_VALUES (enumtype) = values;
5688 /* Record the min/max values so that we can warn about bit-field
5689 enumerations that are too small for the values. */
5690 lt = GGC_CNEW (struct lang_type);
5691 lt->enum_min = minnode;
5692 lt->enum_max = maxnode;
5693 TYPE_LANG_SPECIFIC (enumtype) = lt;
5695 /* Fix up all variant types of this enum type. */
5696 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5698 if (tem == enumtype)
5700 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5701 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5702 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5703 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5704 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5705 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5706 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5707 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5708 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5709 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5710 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5713 /* Finish debugging output for this type. */
5714 rest_of_type_compilation (enumtype, toplevel);
5719 /* Build and install a CONST_DECL for one value of the
5720 current enumeration type (one that was begun with start_enum).
5721 Return a tree-list containing the CONST_DECL and its value.
5722 Assignment of sequential values by default is handled here. */
5725 build_enumerator (tree name, tree value)
5729 /* Validate and default VALUE. */
5733 /* Don't issue more errors for error_mark_node (i.e. an
5734 undeclared identifier) - just ignore the value expression. */
5735 if (value == error_mark_node)
5737 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5738 || TREE_CODE (value) != INTEGER_CST)
5740 error ("enumerator value for %qE is not an integer constant", name);
5745 value = default_conversion (value);
5746 constant_expression_warning (value);
5750 /* Default based on previous value. */
5751 /* It should no longer be possible to have NON_LVALUE_EXPR
5755 value = enum_next_value;
5757 error ("overflow in enumeration values");
5760 if (pedantic && !int_fits_type_p (value, integer_type_node))
5762 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5763 /* XXX This causes -pedantic to change the meaning of the program.
5764 Remove? -zw 2004-03-15 */
5765 value = convert (integer_type_node, value);
5768 /* Set basis for default for next value. */
5769 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5770 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5772 /* Now create a declaration for the enum value name. */
5774 type = TREE_TYPE (value);
5775 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5776 TYPE_PRECISION (integer_type_node)),
5777 (TYPE_PRECISION (type)
5778 >= TYPE_PRECISION (integer_type_node)
5779 && TYPE_UNSIGNED (type)));
5781 decl = build_decl (CONST_DECL, name, type);
5782 DECL_INITIAL (decl) = convert (type, value);
5785 return tree_cons (decl, value, NULL_TREE);
5789 /* Create the FUNCTION_DECL for a function definition.
5790 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5791 the declaration; they describe the function's name and the type it returns,
5792 but twisted together in a fashion that parallels the syntax of C.
5794 This function creates a binding context for the function body
5795 as well as setting up the FUNCTION_DECL in current_function_decl.
5797 Returns 1 on success. If the DECLARATOR is not suitable for a function
5798 (it defines a datum instead), we return 0, which tells
5799 yyparse to report a parse error. */
5802 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5805 tree decl1, old_decl;
5806 tree restype, resdecl;
5807 struct c_label_context_se *nstack_se;
5808 struct c_label_context_vm *nstack_vm;
5810 current_function_returns_value = 0; /* Assume, until we see it does. */
5811 current_function_returns_null = 0;
5812 current_function_returns_abnormally = 0;
5813 warn_about_return_type = 0;
5814 current_extern_inline = 0;
5815 c_switch_stack = NULL;
5817 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
5818 nstack_se->labels_def = NULL;
5819 nstack_se->labels_used = NULL;
5820 nstack_se->next = label_context_stack_se;
5821 label_context_stack_se = nstack_se;
5823 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
5824 nstack_vm->labels_def = NULL;
5825 nstack_vm->labels_used = NULL;
5826 nstack_vm->scope = 0;
5827 nstack_vm->next = label_context_stack_vm;
5828 label_context_stack_vm = nstack_vm;
5830 /* Indicate no valid break/continue context by setting these variables
5831 to some non-null, non-label value. We'll notice and emit the proper
5832 error message in c_finish_bc_stmt. */
5833 c_break_label = c_cont_label = size_zero_node;
5835 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5837 /* If the declarator is not suitable for a function definition,
5838 cause a syntax error. */
5841 label_context_stack_se = label_context_stack_se->next;
5842 label_context_stack_vm = label_context_stack_vm->next;
5846 decl_attributes (&decl1, attributes, 0);
5848 if (DECL_DECLARED_INLINE_P (decl1)
5849 && DECL_UNINLINABLE (decl1)
5850 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5851 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
5854 announce_function (decl1);
5856 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5858 error ("return type is an incomplete type");
5859 /* Make it return void instead. */
5861 = build_function_type (void_type_node,
5862 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5865 if (warn_about_return_type)
5866 pedwarn_c99 ("return type defaults to %<int%>");
5868 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5869 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5870 DECL_INITIAL (decl1) = error_mark_node;
5872 /* If this definition isn't a prototype and we had a prototype declaration
5873 before, copy the arg type info from that prototype. */
5874 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5875 current_function_prototype_locus = UNKNOWN_LOCATION;
5876 current_function_prototype_built_in = false;
5877 current_function_prototype_arg_types = NULL_TREE;
5878 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5880 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5881 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5882 TREE_TYPE (TREE_TYPE (old_decl))))
5884 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5886 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5887 current_function_prototype_built_in
5888 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
5889 current_function_prototype_arg_types
5890 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
5892 if (TREE_PUBLIC (decl1))
5894 /* If there is an external prototype declaration of this
5895 function, record its location but do not copy information
5896 to this decl. This may be an invisible declaration
5897 (built-in or in a scope which has finished) or simply
5898 have more refined argument types than any declaration
5900 struct c_binding *b;
5901 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
5902 if (B_IN_SCOPE (b, external_scope))
5906 tree ext_decl, ext_type;
5908 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
5909 if (TREE_CODE (ext_type) == FUNCTION_TYPE
5910 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5911 TREE_TYPE (ext_type)))
5913 current_function_prototype_locus
5914 = DECL_SOURCE_LOCATION (ext_decl);
5915 current_function_prototype_built_in
5916 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
5917 current_function_prototype_arg_types
5918 = TYPE_ARG_TYPES (ext_type);
5924 /* Optionally warn of old-fashioned def with no previous prototype. */
5925 if (warn_strict_prototypes
5926 && old_decl != error_mark_node
5927 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5928 && C_DECL_ISNT_PROTOTYPE (old_decl))
5929 warning (OPT_Wstrict_prototypes,
5930 "function declaration isn%'t a prototype");
5931 /* Optionally warn of any global def with no previous prototype. */
5932 else if (warn_missing_prototypes
5933 && old_decl != error_mark_node
5934 && TREE_PUBLIC (decl1)
5935 && !MAIN_NAME_P (DECL_NAME (decl1))
5936 && C_DECL_ISNT_PROTOTYPE (old_decl))
5937 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
5938 /* Optionally warn of any def with no previous prototype
5939 if the function has already been used. */
5940 else if (warn_missing_prototypes
5942 && old_decl != error_mark_node
5943 && TREE_USED (old_decl)
5944 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5945 warning (OPT_Wmissing_prototypes,
5946 "%q+D was used with no prototype before its definition", decl1);
5947 /* Optionally warn of any global def with no previous declaration. */
5948 else if (warn_missing_declarations
5949 && TREE_PUBLIC (decl1)
5951 && !MAIN_NAME_P (DECL_NAME (decl1)))
5952 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
5954 /* Optionally warn of any def with no previous declaration
5955 if the function has already been used. */
5956 else if (warn_missing_declarations
5958 && old_decl != error_mark_node
5959 && TREE_USED (old_decl)
5960 && C_DECL_IMPLICIT (old_decl))
5961 warning (OPT_Wmissing_declarations,
5962 "%q+D was used with no declaration before its definition", decl1);
5964 /* This is a definition, not a reference.
5965 So normally clear DECL_EXTERNAL.
5966 However, `extern inline' acts like a declaration
5967 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5968 DECL_EXTERNAL (decl1) = current_extern_inline;
5970 /* This function exists in static storage.
5971 (This does not mean `static' in the C sense!) */
5972 TREE_STATIC (decl1) = 1;
5974 /* A nested function is not global. */
5975 if (current_function_decl != 0)
5976 TREE_PUBLIC (decl1) = 0;
5978 /* This is the earliest point at which we might know the assembler
5979 name of the function. Thus, if it's set before this, die horribly. */
5980 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5982 /* If #pragma weak was used, mark the decl weak now. */
5983 if (current_scope == file_scope)
5984 maybe_apply_pragma_weak (decl1);
5986 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5987 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5992 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5993 != integer_type_node)
5994 pedwarn ("return type of %q+D is not %<int%>", decl1);
5996 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5997 args = TREE_CHAIN (args))
5999 tree type = args ? TREE_VALUE (args) : 0;
6001 if (type == void_type_node)
6008 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6009 pedwarn ("first argument of %q+D should be %<int%>", decl1);
6013 if (TREE_CODE (type) != POINTER_TYPE
6014 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6015 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6017 pedwarn ("second argument of %q+D should be %<char **%>",
6022 if (TREE_CODE (type) != POINTER_TYPE
6023 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6024 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6026 pedwarn ("third argument of %q+D should probably be "
6027 "%<char **%>", decl1);
6032 /* It is intentional that this message does not mention the third
6033 argument because it's only mentioned in an appendix of the
6035 if (argct > 0 && (argct < 2 || argct > 3))
6036 pedwarn ("%q+D takes only zero or two arguments", decl1);
6038 if (!TREE_PUBLIC (decl1))
6039 pedwarn ("%q+D is normally a non-static function", decl1);
6042 /* Record the decl so that the function name is defined.
6043 If we already have a decl for this name, and it is a FUNCTION_DECL,
6044 use the old decl. */
6046 current_function_decl = pushdecl (decl1);
6049 declare_parm_level ();
6051 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6052 /* Promote the value to int before returning it. */
6053 if (c_promoting_integer_type_p (restype))
6055 /* It retains unsignedness if not really getting wider. */
6056 if (TYPE_UNSIGNED (restype)
6057 && (TYPE_PRECISION (restype)
6058 == TYPE_PRECISION (integer_type_node)))
6059 restype = unsigned_type_node;
6061 restype = integer_type_node;
6064 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6065 DECL_ARTIFICIAL (resdecl) = 1;
6066 DECL_IGNORED_P (resdecl) = 1;
6067 DECL_RESULT (current_function_decl) = resdecl;
6069 start_fname_decls ();
6074 /* Subroutine of store_parm_decls which handles new-style function
6075 definitions (prototype format). The parms already have decls, so we
6076 need only record them as in effect and complain if any redundant
6077 old-style parm decls were written. */
6079 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6083 if (current_scope->bindings)
6085 error ("%Jold-style parameter declarations in prototyped "
6086 "function definition", fndecl);
6088 /* Get rid of the old-style declarations. */
6092 /* Don't issue this warning for nested functions, and don't issue this
6093 warning if we got here because ARG_INFO_TYPES was error_mark_node
6094 (this happens when a function definition has just an ellipsis in
6095 its parameter list). */
6096 else if (!in_system_header && !current_function_scope
6097 && arg_info->types != error_mark_node)
6098 warning (OPT_Wtraditional,
6099 "%Jtraditional C rejects ISO C style function definitions",
6102 /* Now make all the parameter declarations visible in the function body.
6103 We can bypass most of the grunt work of pushdecl. */
6104 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6106 DECL_CONTEXT (decl) = current_function_decl;
6107 if (DECL_NAME (decl))
6108 bind (DECL_NAME (decl), decl, current_scope,
6109 /*invisible=*/false, /*nested=*/false);
6111 error ("%Jparameter name omitted", decl);
6114 /* Record the parameter list in the function declaration. */
6115 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6117 /* Now make all the ancillary declarations visible, likewise. */
6118 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6120 DECL_CONTEXT (decl) = current_function_decl;
6121 if (DECL_NAME (decl))
6122 bind (DECL_NAME (decl), decl, current_scope,
6123 /*invisible=*/false, /*nested=*/false);
6126 /* And all the tag declarations. */
6127 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6128 if (TREE_PURPOSE (decl))
6129 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6130 /*invisible=*/false, /*nested=*/false);
6133 /* Subroutine of store_parm_decls which handles old-style function
6134 definitions (separate parameter list and declarations). */
6137 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6139 struct c_binding *b;
6140 tree parm, decl, last;
6141 tree parmids = arg_info->parms;
6142 struct pointer_set_t *seen_args = pointer_set_create ();
6144 if (!in_system_header)
6145 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6148 /* Match each formal parameter name with its declaration. Save each
6149 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6150 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6152 if (TREE_VALUE (parm) == 0)
6154 error ("%Jparameter name missing from parameter list", fndecl);
6155 TREE_PURPOSE (parm) = 0;
6159 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6160 if (b && B_IN_CURRENT_SCOPE (b))
6163 /* If we got something other than a PARM_DECL it is an error. */
6164 if (TREE_CODE (decl) != PARM_DECL)
6165 error ("%q+D declared as a non-parameter", decl);
6166 /* If the declaration is already marked, we have a duplicate
6167 name. Complain and ignore the duplicate. */
6168 else if (pointer_set_contains (seen_args, decl))
6170 error ("multiple parameters named %q+D", decl);
6171 TREE_PURPOSE (parm) = 0;
6174 /* If the declaration says "void", complain and turn it into
6176 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6178 error ("parameter %q+D declared with void type", decl);
6179 TREE_TYPE (decl) = integer_type_node;
6180 DECL_ARG_TYPE (decl) = integer_type_node;
6181 layout_decl (decl, 0);
6184 /* If no declaration found, default to int. */
6187 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6188 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6189 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6193 pedwarn ("type of %q+D defaults to %<int%>", decl);
6194 else if (extra_warnings)
6195 warning (OPT_Wextra, "type of %q+D defaults to %<int%>", decl);
6198 TREE_PURPOSE (parm) = decl;
6199 pointer_set_insert (seen_args, decl);
6202 /* Now examine the parms chain for incomplete declarations
6203 and declarations with no corresponding names. */
6205 for (b = current_scope->bindings; b; b = b->prev)
6208 if (TREE_CODE (parm) != PARM_DECL)
6211 if (TREE_TYPE (parm) != error_mark_node
6212 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6214 error ("parameter %q+D has incomplete type", parm);
6215 TREE_TYPE (parm) = error_mark_node;
6218 if (!pointer_set_contains (seen_args, parm))
6220 error ("declaration for parameter %q+D but no such parameter", parm);
6222 /* Pretend the parameter was not missing.
6223 This gets us to a standard state and minimizes
6224 further error messages. */
6225 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6229 /* Chain the declarations together in the order of the list of
6230 names. Store that chain in the function decl, replacing the
6231 list of names. Update the current scope to match. */
6232 DECL_ARGUMENTS (fndecl) = 0;
6234 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6235 if (TREE_PURPOSE (parm))
6237 if (parm && TREE_PURPOSE (parm))
6239 last = TREE_PURPOSE (parm);
6240 DECL_ARGUMENTS (fndecl) = last;
6242 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6243 if (TREE_PURPOSE (parm))
6245 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6246 last = TREE_PURPOSE (parm);
6248 TREE_CHAIN (last) = 0;
6251 pointer_set_destroy (seen_args);
6253 /* If there was a previous prototype,
6254 set the DECL_ARG_TYPE of each argument according to
6255 the type previously specified, and report any mismatches. */
6257 if (current_function_prototype_arg_types)
6260 for (parm = DECL_ARGUMENTS (fndecl),
6261 type = current_function_prototype_arg_types;
6262 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6263 != void_type_node));
6264 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6266 if (parm == 0 || type == 0
6267 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6269 if (current_function_prototype_built_in)
6270 warning (0, "number of arguments doesn%'t match "
6271 "built-in prototype");
6274 error ("number of arguments doesn%'t match prototype");
6275 error ("%Hprototype declaration",
6276 ¤t_function_prototype_locus);
6280 /* Type for passing arg must be consistent with that
6281 declared for the arg. ISO C says we take the unqualified
6282 type for parameters declared with qualified type. */
6283 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6284 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6286 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6287 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6289 /* Adjust argument to match prototype. E.g. a previous
6290 `int foo(float);' prototype causes
6291 `int foo(x) float x; {...}' to be treated like
6292 `int foo(float x) {...}'. This is particularly
6293 useful for argument types like uid_t. */
6294 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6296 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6297 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6298 && TYPE_PRECISION (TREE_TYPE (parm))
6299 < TYPE_PRECISION (integer_type_node))
6300 DECL_ARG_TYPE (parm) = integer_type_node;
6304 /* ??? Is it possible to get here with a
6305 built-in prototype or will it always have
6306 been diagnosed as conflicting with an
6307 old-style definition and discarded? */
6308 if (current_function_prototype_built_in)
6309 warning (0, "promoted argument %qD "
6310 "doesn%'t match built-in prototype", parm);
6313 pedwarn ("promoted argument %qD "
6314 "doesn%'t match prototype", parm);
6315 pedwarn ("%Hprototype declaration",
6316 ¤t_function_prototype_locus);
6322 if (current_function_prototype_built_in)
6323 warning (0, "argument %qD doesn%'t match "
6324 "built-in prototype", parm);
6327 error ("argument %qD doesn%'t match prototype", parm);
6328 error ("%Hprototype declaration",
6329 ¤t_function_prototype_locus);
6334 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6337 /* Otherwise, create a prototype that would match. */
6341 tree actual = 0, last = 0, type;
6343 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6345 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6347 TREE_CHAIN (last) = type;
6352 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6354 TREE_CHAIN (last) = type;
6358 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6359 of the type of this function, but we need to avoid having this
6360 affect the types of other similarly-typed functions, so we must
6361 first force the generation of an identical (but separate) type
6362 node for the relevant function type. The new node we create
6363 will be a variant of the main variant of the original function
6366 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6368 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6372 /* Store parameter declarations passed in ARG_INFO into the current
6373 function declaration. */
6376 store_parm_decls_from (struct c_arg_info *arg_info)
6378 current_function_arg_info = arg_info;
6379 store_parm_decls ();
6382 /* Store the parameter declarations into the current function declaration.
6383 This is called after parsing the parameter declarations, before
6384 digesting the body of the function.
6386 For an old-style definition, construct a prototype out of the old-style
6387 parameter declarations and inject it into the function's type. */
6390 store_parm_decls (void)
6392 tree fndecl = current_function_decl;
6395 /* The argument information block for FNDECL. */
6396 struct c_arg_info *arg_info = current_function_arg_info;
6397 current_function_arg_info = 0;
6399 /* True if this definition is written with a prototype. Note:
6400 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6401 list in a function definition as equivalent to (void) -- an
6402 empty argument list specifies the function has no parameters,
6403 but only (void) sets up a prototype for future calls. */
6404 proto = arg_info->types != 0;
6407 store_parm_decls_newstyle (fndecl, arg_info);
6409 store_parm_decls_oldstyle (fndecl, arg_info);
6411 /* The next call to push_scope will be a function body. */
6413 next_is_function_body = true;
6415 /* Write a record describing this function definition to the prototypes
6416 file (if requested). */
6418 gen_aux_info_record (fndecl, 1, 0, proto);
6420 /* Initialize the RTL code for the function. */
6421 allocate_struct_function (fndecl);
6423 /* Begin the statement tree for this function. */
6424 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6426 /* ??? Insert the contents of the pending sizes list into the function
6427 to be evaluated. The only reason left to have this is
6428 void foo(int n, int array[n++])
6429 because we throw away the array type in favor of a pointer type, and
6430 thus won't naturally see the SAVE_EXPR containing the increment. All
6431 other pending sizes would be handled by gimplify_parameters. */
6434 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6435 add_stmt (TREE_VALUE (t));
6438 /* Even though we're inside a function body, we still don't want to
6439 call expand_expr to calculate the size of a variable-sized array.
6440 We haven't necessarily assigned RTL to all variables yet, so it's
6441 not safe to try to expand expressions involving them. */
6442 cfun->x_dont_save_pending_sizes_p = 1;
6445 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6449 c_warn_unused_result_recursively (tree fndecl)
6451 struct cgraph_node *cgn;
6453 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6454 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6456 /* Finalize all nested functions now. */
6457 cgn = cgraph_node (fndecl);
6458 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6459 c_warn_unused_result_recursively (cgn->decl);
6462 /* Finish up a function declaration and compile that function
6463 all the way to assembler language output. The free the storage
6464 for the function definition.
6466 This is called after parsing the body of the function definition. */
6469 finish_function (void)
6471 tree fndecl = current_function_decl;
6473 label_context_stack_se = label_context_stack_se->next;
6474 label_context_stack_vm = label_context_stack_vm->next;
6476 if (TREE_CODE (fndecl) == FUNCTION_DECL
6477 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6479 tree args = DECL_ARGUMENTS (fndecl);
6480 for (; args; args = TREE_CHAIN (args))
6482 tree type = TREE_TYPE (args);
6483 if (INTEGRAL_TYPE_P (type)
6484 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6485 DECL_ARG_TYPE (args) = integer_type_node;
6489 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6490 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6492 /* Must mark the RESULT_DECL as being in this function. */
6494 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6495 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6497 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6499 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6500 != integer_type_node)
6502 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6503 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6505 pedwarn ("return type of %q+D is not %<int%>", fndecl);
6511 tree stmt = c_finish_return (integer_zero_node);
6512 #ifdef USE_MAPPED_LOCATION
6513 /* Hack. We don't want the middle-end to warn that this return
6514 is unreachable, so we mark its location as special. Using
6515 UNKNOWN_LOCATION has the problem that it gets clobbered in
6516 annotate_one_with_locus. A cleaner solution might be to
6517 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6519 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6521 /* Hack. We don't want the middle-end to warn that this
6522 return is unreachable, so put the statement on the
6524 annotate_with_file_line (stmt, input_filename, 0);
6530 /* Tie off the statement tree for this function. */
6531 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6533 finish_fname_decls ();
6535 /* Complain if there's just no return statement. */
6536 if (warn_return_type
6537 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6538 && !current_function_returns_value && !current_function_returns_null
6539 /* Don't complain if we are no-return. */
6540 && !current_function_returns_abnormally
6541 /* Don't warn for main(). */
6542 && !MAIN_NAME_P (DECL_NAME (fndecl))
6543 /* Or if they didn't actually specify a return type. */
6544 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6545 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6546 inline function, as we might never be compiled separately. */
6547 && DECL_INLINE (fndecl))
6549 warning (OPT_Wreturn_type,
6550 "no return statement in function returning non-void");
6551 TREE_NO_WARNING (fndecl) = 1;
6554 /* With just -Wextra, complain only if function returns both with
6555 and without a value. */
6557 && current_function_returns_value
6558 && current_function_returns_null)
6559 warning (OPT_Wextra, "this function may return with or without a value");
6561 /* Store the end of the function, so that we get good line number
6562 info for the epilogue. */
6563 cfun->function_end_locus = input_location;
6565 /* If we don't have ctors/dtors sections, and this is a static
6566 constructor or destructor, it must be recorded now. */
6567 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6568 && !targetm.have_ctors_dtors)
6569 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6570 if (DECL_STATIC_DESTRUCTOR (fndecl)
6571 && !targetm.have_ctors_dtors)
6572 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6574 /* Finalize the ELF visibility for the function. */
6575 c_determine_visibility (fndecl);
6577 /* Genericize before inlining. Delay genericizing nested functions
6578 until their parent function is genericized. Since finalizing
6579 requires GENERIC, delay that as well. */
6581 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6582 && !undef_nested_function)
6584 if (!decl_function_context (fndecl))
6586 c_genericize (fndecl);
6587 c_warn_unused_result_recursively (fndecl);
6589 /* ??? Objc emits functions after finalizing the compilation unit.
6590 This should be cleaned up later and this conditional removed. */
6591 if (cgraph_global_info_ready)
6593 c_expand_body (fndecl);
6597 cgraph_finalize_function (fndecl, false);
6601 /* Register this function with cgraph just far enough to get it
6602 added to our parent's nested function list. Handy, since the
6603 C front end doesn't have such a list. */
6604 (void) cgraph_node (fndecl);
6608 if (!decl_function_context (fndecl))
6609 undef_nested_function = false;
6611 /* We're leaving the context of this function, so zap cfun.
6612 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6613 tree_rest_of_compilation. */
6615 current_function_decl = NULL;
6618 /* Generate the RTL for the body of FNDECL. */
6621 c_expand_body (tree fndecl)
6624 if (!DECL_INITIAL (fndecl)
6625 || DECL_INITIAL (fndecl) == error_mark_node)
6628 tree_rest_of_compilation (fndecl);
6630 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6631 && targetm.have_ctors_dtors)
6632 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6633 DEFAULT_INIT_PRIORITY);
6634 if (DECL_STATIC_DESTRUCTOR (fndecl)
6635 && targetm.have_ctors_dtors)
6636 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6637 DEFAULT_INIT_PRIORITY);
6640 /* Check the declarations given in a for-loop for satisfying the C99
6643 check_for_loop_decls (void)
6645 struct c_binding *b;
6649 /* If we get here, declarations have been used in a for loop without
6650 the C99 for loop scope. This doesn't make much sense, so don't
6652 error ("%<for%> loop initial declaration used outside C99 mode");
6655 /* C99 subclause 6.8.5 paragraph 3:
6657 [#3] The declaration part of a for statement shall only
6658 declare identifiers for objects having storage class auto or
6661 It isn't clear whether, in this sentence, "identifiers" binds to
6662 "shall only declare" or to "objects" - that is, whether all identifiers
6663 declared must be identifiers for objects, or whether the restriction
6664 only applies to those that are. (A question on this in comp.std.c
6665 in November 2000 received no answer.) We implement the strictest
6666 interpretation, to avoid creating an extension which later causes
6669 for (b = current_scope->bindings; b; b = b->prev)
6672 tree decl = b->decl;
6677 switch (TREE_CODE (decl))
6680 if (TREE_STATIC (decl))
6681 error ("declaration of static variable %q+D in %<for%> loop "
6682 "initial declaration", decl);
6683 else if (DECL_EXTERNAL (decl))
6684 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6685 "initial declaration", decl);
6689 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6693 error ("%<union %E%> declared in %<for%> loop initial declaration",
6697 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6701 error ("declaration of non-variable %q+D in %<for%> loop "
6702 "initial declaration", decl);
6707 /* Save and reinitialize the variables
6708 used during compilation of a C function. */
6711 c_push_function_context (struct function *f)
6713 struct language_function *p;
6714 p = GGC_NEW (struct language_function);
6717 p->base.x_stmt_tree = c_stmt_tree;
6718 p->x_break_label = c_break_label;
6719 p->x_cont_label = c_cont_label;
6720 p->x_switch_stack = c_switch_stack;
6721 p->arg_info = current_function_arg_info;
6722 p->returns_value = current_function_returns_value;
6723 p->returns_null = current_function_returns_null;
6724 p->returns_abnormally = current_function_returns_abnormally;
6725 p->warn_about_return_type = warn_about_return_type;
6726 p->extern_inline = current_extern_inline;
6729 /* Restore the variables used during compilation of a C function. */
6732 c_pop_function_context (struct function *f)
6734 struct language_function *p = f->language;
6736 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6737 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6739 /* Stop pointing to the local nodes about to be freed. */
6740 /* But DECL_INITIAL must remain nonzero so we know this
6741 was an actual function definition. */
6742 DECL_INITIAL (current_function_decl) = error_mark_node;
6743 DECL_ARGUMENTS (current_function_decl) = 0;
6746 c_stmt_tree = p->base.x_stmt_tree;
6747 c_break_label = p->x_break_label;
6748 c_cont_label = p->x_cont_label;
6749 c_switch_stack = p->x_switch_stack;
6750 current_function_arg_info = p->arg_info;
6751 current_function_returns_value = p->returns_value;
6752 current_function_returns_null = p->returns_null;
6753 current_function_returns_abnormally = p->returns_abnormally;
6754 warn_about_return_type = p->warn_about_return_type;
6755 current_extern_inline = p->extern_inline;
6760 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6763 c_dup_lang_specific_decl (tree decl)
6765 struct lang_decl *ld;
6767 if (!DECL_LANG_SPECIFIC (decl))
6770 ld = GGC_NEW (struct lang_decl);
6771 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6772 DECL_LANG_SPECIFIC (decl) = ld;
6775 /* The functions below are required for functionality of doing
6776 function at once processing in the C front end. Currently these
6777 functions are not called from anywhere in the C front end, but as
6778 these changes continue, that will change. */
6780 /* Returns the stmt_tree (if any) to which statements are currently
6781 being added. If there is no active statement-tree, NULL is
6785 current_stmt_tree (void)
6787 return &c_stmt_tree;
6790 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6794 anon_aggr_type_p (tree ARG_UNUSED (node))
6799 /* Return the global value of T as a symbol. */
6802 identifier_global_value (tree t)
6804 struct c_binding *b;
6806 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6807 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6813 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6814 otherwise the name is found in ridpointers from RID_INDEX. */
6817 record_builtin_type (enum rid rid_index, const char *name, tree type)
6821 id = ridpointers[(int) rid_index];
6823 id = get_identifier (name);
6824 decl = build_decl (TYPE_DECL, id, type);
6826 if (debug_hooks->type_decl)
6827 debug_hooks->type_decl (decl, false);
6830 /* Build the void_list_node (void_type_node having been created). */
6832 build_void_list_node (void)
6834 tree t = build_tree_list (NULL_TREE, void_type_node);
6838 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6841 build_c_parm (struct c_declspecs *specs, tree attrs,
6842 struct c_declarator *declarator)
6844 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6847 ret->declarator = declarator;
6851 /* Return a declarator with nested attributes. TARGET is the inner
6852 declarator to which these attributes apply. ATTRS are the
6855 struct c_declarator *
6856 build_attrs_declarator (tree attrs, struct c_declarator *target)
6858 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6859 ret->kind = cdk_attrs;
6860 ret->declarator = target;
6861 ret->u.attrs = attrs;
6865 /* Return a declarator for a function with arguments specified by ARGS
6866 and return type specified by TARGET. */
6868 struct c_declarator *
6869 build_function_declarator (struct c_arg_info *args,
6870 struct c_declarator *target)
6872 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6873 ret->kind = cdk_function;
6874 ret->declarator = target;
6875 ret->u.arg_info = args;
6879 /* Return a declarator for the identifier IDENT (which may be
6880 NULL_TREE for an abstract declarator). */
6882 struct c_declarator *
6883 build_id_declarator (tree ident)
6885 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6887 ret->declarator = 0;
6889 /* Default value - may get reset to a more precise location. */
6890 ret->id_loc = input_location;
6894 /* Return something to represent absolute declarators containing a *.
6895 TARGET is the absolute declarator that the * contains.
6896 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6897 to apply to the pointer type. */
6899 struct c_declarator *
6900 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6901 struct c_declarator *target)
6905 struct c_declarator *itarget = target;
6906 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6907 if (type_quals_attrs)
6909 attrs = type_quals_attrs->attrs;
6910 quals = quals_from_declspecs (type_quals_attrs);
6911 if (attrs != NULL_TREE)
6912 itarget = build_attrs_declarator (attrs, target);
6914 ret->kind = cdk_pointer;
6915 ret->declarator = itarget;
6916 ret->u.pointer_quals = quals;
6920 /* Return a pointer to a structure for an empty list of declaration
6923 struct c_declspecs *
6924 build_null_declspecs (void)
6926 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6930 ret->typespec_word = cts_none;
6931 ret->storage_class = csc_none;
6932 ret->declspecs_seen_p = false;
6933 ret->type_seen_p = false;
6934 ret->non_sc_seen_p = false;
6935 ret->typedef_p = false;
6936 ret->tag_defined_p = false;
6937 ret->explicit_signed_p = false;
6938 ret->deprecated_p = false;
6939 ret->default_int_p = false;
6940 ret->long_p = false;
6941 ret->long_long_p = false;
6942 ret->short_p = false;
6943 ret->signed_p = false;
6944 ret->unsigned_p = false;
6945 ret->complex_p = false;
6946 ret->inline_p = false;
6947 ret->thread_p = false;
6948 ret->const_p = false;
6949 ret->volatile_p = false;
6950 ret->restrict_p = false;
6954 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6957 struct c_declspecs *
6958 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6962 specs->non_sc_seen_p = true;
6963 specs->declspecs_seen_p = true;
6964 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6965 && C_IS_RESERVED_WORD (qual));
6966 i = C_RID_CODE (qual);
6970 dupe = specs->const_p;
6971 specs->const_p = true;
6974 dupe = specs->volatile_p;
6975 specs->volatile_p = true;
6978 dupe = specs->restrict_p;
6979 specs->restrict_p = true;
6984 if (dupe && pedantic && !flag_isoc99)
6985 pedwarn ("duplicate %qE", qual);
6989 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6992 struct c_declspecs *
6993 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
6995 tree type = spec.spec;
6996 specs->non_sc_seen_p = true;
6997 specs->declspecs_seen_p = true;
6998 specs->type_seen_p = true;
6999 if (TREE_DEPRECATED (type))
7000 specs->deprecated_p = true;
7002 /* Handle type specifier keywords. */
7003 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
7005 enum rid i = C_RID_CODE (type);
7008 error ("two or more data types in declaration specifiers");
7011 if ((int) i <= (int) RID_LAST_MODIFIER)
7013 /* "long", "short", "signed", "unsigned" or "_Complex". */
7018 if (specs->long_long_p)
7020 error ("%<long long long%> is too long for GCC");
7025 if (specs->typespec_word == cts_double)
7027 error ("both %<long long%> and %<double%> in "
7028 "declaration specifiers");
7031 if (pedantic && !flag_isoc99 && !in_system_header
7033 pedwarn ("ISO C90 does not support %<long long%>");
7034 specs->long_long_p = 1;
7038 error ("both %<long%> and %<short%> in "
7039 "declaration specifiers");
7040 else if (specs->typespec_word == cts_void)
7041 error ("both %<long%> and %<void%> in "
7042 "declaration specifiers");
7043 else if (specs->typespec_word == cts_bool)
7044 error ("both %<long%> and %<_Bool%> in "
7045 "declaration specifiers");
7046 else if (specs->typespec_word == cts_char)
7047 error ("both %<long%> and %<char%> in "
7048 "declaration specifiers");
7049 else if (specs->typespec_word == cts_float)
7050 error ("both %<long%> and %<float%> in "
7051 "declaration specifiers");
7053 specs->long_p = true;
7056 dupe = specs->short_p;
7058 error ("both %<long%> and %<short%> in "
7059 "declaration specifiers");
7060 else if (specs->typespec_word == cts_void)
7061 error ("both %<short%> and %<void%> in "
7062 "declaration specifiers");
7063 else if (specs->typespec_word == cts_bool)
7064 error ("both %<short%> and %<_Bool%> in "
7065 "declaration specifiers");
7066 else if (specs->typespec_word == cts_char)
7067 error ("both %<short%> and %<char%> in "
7068 "declaration specifiers");
7069 else if (specs->typespec_word == cts_float)
7070 error ("both %<short%> and %<float%> in "
7071 "declaration specifiers");
7072 else if (specs->typespec_word == cts_double)
7073 error ("both %<short%> and %<double%> in "
7074 "declaration specifiers");
7076 specs->short_p = true;
7079 dupe = specs->signed_p;
7080 if (specs->unsigned_p)
7081 error ("both %<signed%> and %<unsigned%> in "
7082 "declaration specifiers");
7083 else if (specs->typespec_word == cts_void)
7084 error ("both %<signed%> and %<void%> in "
7085 "declaration specifiers");
7086 else if (specs->typespec_word == cts_bool)
7087 error ("both %<signed%> and %<_Bool%> in "
7088 "declaration specifiers");
7089 else if (specs->typespec_word == cts_float)
7090 error ("both %<signed%> and %<float%> in "
7091 "declaration specifiers");
7092 else if (specs->typespec_word == cts_double)
7093 error ("both %<signed%> and %<double%> in "
7094 "declaration specifiers");
7096 specs->signed_p = true;
7099 dupe = specs->unsigned_p;
7100 if (specs->signed_p)
7101 error ("both %<signed%> and %<unsigned%> in "
7102 "declaration specifiers");
7103 else if (specs->typespec_word == cts_void)
7104 error ("both %<unsigned%> and %<void%> in "
7105 "declaration specifiers");
7106 else if (specs->typespec_word == cts_bool)
7107 error ("both %<unsigned%> and %<_Bool%> in "
7108 "declaration specifiers");
7109 else if (specs->typespec_word == cts_float)
7110 error ("both %<unsigned%> and %<float%> in "
7111 "declaration specifiers");
7112 else if (specs->typespec_word == cts_double)
7113 error ("both %<unsigned%> and %<double%> in "
7114 "declaration specifiers");
7116 specs->unsigned_p = true;
7119 dupe = specs->complex_p;
7120 if (pedantic && !flag_isoc99 && !in_system_header)
7121 pedwarn ("ISO C90 does not support complex types");
7122 if (specs->typespec_word == cts_void)
7123 error ("both %<complex%> and %<void%> in "
7124 "declaration specifiers");
7125 else if (specs->typespec_word == cts_bool)
7126 error ("both %<complex%> and %<_Bool%> in "
7127 "declaration specifiers");
7129 specs->complex_p = true;
7136 error ("duplicate %qE", type);
7142 /* "void", "_Bool", "char", "int", "float" or "double". */
7143 if (specs->typespec_word != cts_none)
7145 error ("two or more data types in declaration specifiers");
7152 error ("both %<long%> and %<void%> in "
7153 "declaration specifiers");
7154 else if (specs->short_p)
7155 error ("both %<short%> and %<void%> in "
7156 "declaration specifiers");
7157 else if (specs->signed_p)
7158 error ("both %<signed%> and %<void%> in "
7159 "declaration specifiers");
7160 else if (specs->unsigned_p)
7161 error ("both %<unsigned%> and %<void%> in "
7162 "declaration specifiers");
7163 else if (specs->complex_p)
7164 error ("both %<complex%> and %<void%> in "
7165 "declaration specifiers");
7167 specs->typespec_word = cts_void;
7171 error ("both %<long%> and %<_Bool%> in "
7172 "declaration specifiers");
7173 else if (specs->short_p)
7174 error ("both %<short%> and %<_Bool%> in "
7175 "declaration specifiers");
7176 else if (specs->signed_p)
7177 error ("both %<signed%> and %<_Bool%> in "
7178 "declaration specifiers");
7179 else if (specs->unsigned_p)
7180 error ("both %<unsigned%> and %<_Bool%> in "
7181 "declaration specifiers");
7182 else if (specs->complex_p)
7183 error ("both %<complex%> and %<_Bool%> in "
7184 "declaration specifiers");
7186 specs->typespec_word = cts_bool;
7190 error ("both %<long%> and %<char%> in "
7191 "declaration specifiers");
7192 else if (specs->short_p)
7193 error ("both %<short%> and %<char%> in "
7194 "declaration specifiers");
7196 specs->typespec_word = cts_char;
7199 specs->typespec_word = cts_int;
7203 error ("both %<long%> and %<float%> in "
7204 "declaration specifiers");
7205 else if (specs->short_p)
7206 error ("both %<short%> and %<float%> in "
7207 "declaration specifiers");
7208 else if (specs->signed_p)
7209 error ("both %<signed%> and %<float%> in "
7210 "declaration specifiers");
7211 else if (specs->unsigned_p)
7212 error ("both %<unsigned%> and %<float%> in "
7213 "declaration specifiers");
7215 specs->typespec_word = cts_float;
7218 if (specs->long_long_p)
7219 error ("both %<long long%> and %<double%> in "
7220 "declaration specifiers");
7221 else if (specs->short_p)
7222 error ("both %<short%> and %<double%> in "
7223 "declaration specifiers");
7224 else if (specs->signed_p)
7225 error ("both %<signed%> and %<double%> in "
7226 "declaration specifiers");
7227 else if (specs->unsigned_p)
7228 error ("both %<unsigned%> and %<double%> in "
7229 "declaration specifiers");
7231 specs->typespec_word = cts_double;
7234 /* ObjC reserved word "id", handled below. */
7240 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7241 form of ObjC type, cases such as "int" and "long" being handled
7242 above), a TYPE (struct, union, enum and typeof specifiers) or an
7243 ERROR_MARK. In none of these cases may there have previously
7244 been any type specifiers. */
7245 if (specs->type || specs->typespec_word != cts_none
7246 || specs->long_p || specs->short_p || specs->signed_p
7247 || specs->unsigned_p || specs->complex_p)
7248 error ("two or more data types in declaration specifiers");
7249 else if (TREE_CODE (type) == TYPE_DECL)
7251 if (TREE_TYPE (type) == error_mark_node)
7252 ; /* Allow the type to default to int to avoid cascading errors. */
7255 specs->type = TREE_TYPE (type);
7256 specs->decl_attr = DECL_ATTRIBUTES (type);
7257 specs->typedef_p = true;
7258 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7261 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7263 tree t = lookup_name (type);
7264 if (!t || TREE_CODE (t) != TYPE_DECL)
7265 error ("%qE fails to be a typedef or built in type", type);
7266 else if (TREE_TYPE (t) == error_mark_node)
7269 specs->type = TREE_TYPE (t);
7271 else if (TREE_CODE (type) != ERROR_MARK)
7273 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7274 specs->tag_defined_p = true;
7275 if (spec.kind == ctsk_typeof)
7276 specs->typedef_p = true;
7283 /* Add the storage class specifier or function specifier SCSPEC to the
7284 declaration specifiers SPECS, returning SPECS. */
7286 struct c_declspecs *
7287 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7290 enum c_storage_class n = csc_none;
7292 specs->declspecs_seen_p = true;
7293 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7294 && C_IS_RESERVED_WORD (scspec));
7295 i = C_RID_CODE (scspec);
7296 if (extra_warnings && specs->non_sc_seen_p)
7297 warning (OPT_Wextra, "%qE is not at beginning of declaration", scspec);
7301 /* C99 permits duplicate inline. Although of doubtful utility,
7302 it seems simplest to permit it in gnu89 mode as well, as
7303 there is also little utility in maintaining this as a
7304 difference between gnu89 and C99 inline. */
7306 specs->inline_p = true;
7309 dupe = specs->thread_p;
7310 if (specs->storage_class == csc_auto)
7311 error ("%<__thread%> used with %<auto%>");
7312 else if (specs->storage_class == csc_register)
7313 error ("%<__thread%> used with %<register%>");
7314 else if (specs->storage_class == csc_typedef)
7315 error ("%<__thread%> used with %<typedef%>");
7317 specs->thread_p = true;
7324 /* Diagnose "__thread extern". */
7325 if (specs->thread_p)
7326 error ("%<__thread%> before %<extern%>");
7333 /* Diagnose "__thread static". */
7334 if (specs->thread_p)
7335 error ("%<__thread%> before %<static%>");
7343 if (n != csc_none && n == specs->storage_class)
7346 error ("duplicate %qE", scspec);
7349 if (specs->storage_class != csc_none && n != specs->storage_class)
7351 error ("multiple storage classes in declaration specifiers");
7355 specs->storage_class = n;
7356 if (n != csc_extern && n != csc_static && specs->thread_p)
7358 error ("%<__thread%> used with %qE", scspec);
7359 specs->thread_p = false;
7366 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7369 struct c_declspecs *
7370 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7372 specs->attrs = chainon (attrs, specs->attrs);
7373 specs->declspecs_seen_p = true;
7377 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7378 specifiers with any other type specifier to determine the resulting
7379 type. This is where ISO C checks on complex types are made, since
7380 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7383 struct c_declspecs *
7384 finish_declspecs (struct c_declspecs *specs)
7386 /* If a type was specified as a whole, we have no modifiers and are
7388 if (specs->type != NULL_TREE)
7390 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7391 && !specs->signed_p && !specs->unsigned_p
7392 && !specs->complex_p);
7396 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7397 has been specified, treat it as "int" unless "_Complex" is
7398 present and there are no other specifiers. If we just have
7399 "_Complex", it is equivalent to "_Complex double", but e.g.
7400 "_Complex short" is equivalent to "_Complex short int". */
7401 if (specs->typespec_word == cts_none)
7403 if (specs->long_p || specs->short_p
7404 || specs->signed_p || specs->unsigned_p)
7406 specs->typespec_word = cts_int;
7408 else if (specs->complex_p)
7410 specs->typespec_word = cts_double;
7412 pedwarn ("ISO C does not support plain %<complex%> meaning "
7413 "%<double complex%>");
7417 specs->typespec_word = cts_int;
7418 specs->default_int_p = true;
7419 /* We don't diagnose this here because grokdeclarator will
7420 give more specific diagnostics according to whether it is
7421 a function definition. */
7425 /* If "signed" was specified, record this to distinguish "int" and
7426 "signed int" in the case of a bit-field with
7427 -funsigned-bitfields. */
7428 specs->explicit_signed_p = specs->signed_p;
7430 /* Now compute the actual type. */
7431 switch (specs->typespec_word)
7434 gcc_assert (!specs->long_p && !specs->short_p
7435 && !specs->signed_p && !specs->unsigned_p
7436 && !specs->complex_p);
7437 specs->type = void_type_node;
7440 gcc_assert (!specs->long_p && !specs->short_p
7441 && !specs->signed_p && !specs->unsigned_p
7442 && !specs->complex_p);
7443 specs->type = boolean_type_node;
7446 gcc_assert (!specs->long_p && !specs->short_p);
7447 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7448 if (specs->signed_p)
7449 specs->type = signed_char_type_node;
7450 else if (specs->unsigned_p)
7451 specs->type = unsigned_char_type_node;
7453 specs->type = char_type_node;
7454 if (specs->complex_p)
7457 pedwarn ("ISO C does not support complex integer types");
7458 specs->type = build_complex_type (specs->type);
7462 gcc_assert (!(specs->long_p && specs->short_p));
7463 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7464 if (specs->long_long_p)
7465 specs->type = (specs->unsigned_p
7466 ? long_long_unsigned_type_node
7467 : long_long_integer_type_node);
7468 else if (specs->long_p)
7469 specs->type = (specs->unsigned_p
7470 ? long_unsigned_type_node
7471 : long_integer_type_node);
7472 else if (specs->short_p)
7473 specs->type = (specs->unsigned_p
7474 ? short_unsigned_type_node
7475 : short_integer_type_node);
7477 specs->type = (specs->unsigned_p
7478 ? unsigned_type_node
7479 : integer_type_node);
7480 if (specs->complex_p)
7483 pedwarn ("ISO C does not support complex integer types");
7484 specs->type = build_complex_type (specs->type);
7488 gcc_assert (!specs->long_p && !specs->short_p
7489 && !specs->signed_p && !specs->unsigned_p);
7490 specs->type = (specs->complex_p
7491 ? complex_float_type_node
7495 gcc_assert (!specs->long_long_p && !specs->short_p
7496 && !specs->signed_p && !specs->unsigned_p);
7499 specs->type = (specs->complex_p
7500 ? complex_long_double_type_node
7501 : long_double_type_node);
7505 specs->type = (specs->complex_p
7506 ? complex_double_type_node
7507 : double_type_node);
7517 /* Synthesize a function which calls all the global ctors or global
7518 dtors in this file. This is only used for targets which do not
7519 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7521 build_cdtor (int method_type, tree cdtors)
7528 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7529 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7532 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7535 /* Perform final processing on one file scope's declarations (or the
7536 external scope's declarations), GLOBALS. */
7538 c_write_global_declarations_1 (tree globals)
7540 size_t len = list_length (globals);
7541 tree *vec = XNEWVEC (tree, len);
7545 /* Process the decls in the order they were written. */
7546 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
7549 /* Check for used but undefined static functions using the C
7550 standard's definition of "used", and set TREE_NO_WARNING so
7551 that check_global_declarations doesn't repeat the check. */
7552 if (TREE_CODE (decl) == FUNCTION_DECL
7553 && DECL_INITIAL (decl) == 0
7554 && DECL_EXTERNAL (decl)
7555 && !TREE_PUBLIC (decl)
7556 && C_DECL_USED (decl))
7558 pedwarn ("%q+F used but never defined", decl);
7559 TREE_NO_WARNING (decl) = 1;
7563 wrapup_global_declarations (vec, len);
7564 check_global_declarations (vec, len);
7570 c_write_global_declarations (void)
7574 /* We don't want to do this if generating a PCH. */
7578 /* Don't waste time on further processing if -fsyntax-only or we've
7579 encountered errors. */
7580 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7583 /* Close the external scope. */
7584 ext_block = pop_scope ();
7586 gcc_assert (!current_scope);
7588 /* Process all file scopes in this compilation, and the external_scope,
7589 through wrapup_global_declarations and check_global_declarations. */
7590 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7591 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7594 tree tmp = BLOCK_VARS (ext_block);
7596 FILE * stream = dump_begin (TDI_tu, &flags);
7599 dump_node (tmp, flags & ~TDF_SLIM, stream);
7600 dump_end (TDI_tu, stream);
7603 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7605 /* Generate functions to call static constructors and destructors
7606 for targets that do not support .ctors/.dtors sections. These
7607 functions have magic names which are detected by collect2. */
7608 build_cdtor ('I', static_ctors); static_ctors = 0;
7609 build_cdtor ('D', static_dtors); static_dtors = 0;
7611 /* We're done parsing; proceed to optimize and emit assembly.
7612 FIXME: shouldn't be the front end's responsibility to call this. */
7616 #include "gt-c-decl.h"