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 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, 59 Temple Place - Suite 330, 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"
35 #include "tree-inline.h"
52 #include "langhooks.h"
53 #include "tree-mudflap.h"
54 #include "tree-gimple.h"
55 #include "diagnostic.h"
56 #include "tree-dump.h"
61 #include "langhooks-def.h"
63 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
65 { NORMAL, /* Ordinary declaration */
66 FUNCDEF, /* Function definition */
67 PARM, /* Declaration of parm before function body */
68 FIELD, /* Declaration inside struct or union */
69 TYPENAME}; /* Typename (inside cast or sizeof) */
72 /* Nonzero if we have seen an invalid cross reference
73 to a struct, union, or enum, but not yet printed the message. */
74 tree pending_invalid_xref;
76 /* File and line to appear in the eventual error message. */
77 location_t pending_invalid_xref_location;
79 /* True means we've initialized exception handling. */
80 bool c_eh_initialized_p;
82 /* While defining an enum type, this is 1 plus the last enumerator
83 constant value. Note that will do not have to save this or `enum_overflow'
84 around nested function definition since such a definition could only
85 occur in an enum value expression and we don't use these variables in
88 static tree enum_next_value;
90 /* Nonzero means that there was overflow computing enum_next_value. */
92 static int enum_overflow;
94 /* These #defines are for clarity in working with the information block
95 returned by get_parm_info. */
96 #define ARG_INFO_PARMS(args) TREE_PURPOSE(args)
97 #define ARG_INFO_TAGS(args) TREE_VALUE(args)
98 #define ARG_INFO_TYPES(args) TREE_CHAIN(args)
99 #define ARG_INFO_OTHERS(args) TREE_TYPE(args)
101 /* The file and line that the prototype came from if this is an
102 old-style definition; used for diagnostics in
103 store_parm_decls_oldstyle. */
105 static location_t current_function_prototype_locus;
107 /* The current statement tree. */
109 static GTY(()) struct stmt_tree_s c_stmt_tree;
111 /* State saving variables. */
115 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
116 included in this invocation. Note that the current translation
117 unit is not included in this list. */
119 static GTY(()) tree all_translation_units;
121 /* A list of decls to be made automatically visible in each file scope. */
122 static GTY(()) tree visible_builtins;
124 /* Set to 0 at beginning of a function definition, set to 1 if
125 a return statement that specifies a return value is seen. */
127 int current_function_returns_value;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement with no argument is seen. */
132 int current_function_returns_null;
134 /* Set to 0 at beginning of a function definition, set to 1 if
135 a call to a noreturn function is seen. */
137 int current_function_returns_abnormally;
139 /* Set to nonzero by `grokdeclarator' for a function
140 whose return type is defaulted, if warnings for this are desired. */
142 static int warn_about_return_type;
144 /* Nonzero when starting a function declared `extern inline'. */
146 static int current_extern_inline;
148 /* True means global_bindings_p should return false even if the scope stack
149 says we are in file scope. */
150 bool c_override_global_bindings_to_false;
153 /* Each c_binding structure describes one binding of an identifier to
154 a decl. All the decls in a scope - irrespective of namespace - are
155 chained together by the ->prev field, which (as the name implies)
156 runs in reverse order. All the decls in a given namespace bound to
157 a given identifier are chained by the ->shadowed field, which runs
158 from inner to outer scopes.
160 The ->decl field usually points to a DECL node, but there are two
161 exceptions. In the namespace of type tags, the bound entity is a
162 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
163 identifier is encountered, it is bound to error_mark_node to
164 suppress further errors about that identifier in the current
167 The depth field is copied from the scope structure that holds this
168 decl. It is used to preserve the proper ordering of the ->shadowed
169 field (see bind()) and also for a handful of special-case checks.
170 Finally, the invisible bit is true for a decl which should be
171 ignored for purposes of normal name lookup, and the nested bit is
172 true for a decl that's been bound a second time in an inner scope;
173 in all such cases, the binding in the outer scope will have its
174 invisible bit true. */
176 struct c_binding GTY((chain_next ("%h.prev")))
178 tree decl; /* the decl bound */
179 tree id; /* the identifier it's bound to */
180 struct c_binding *prev; /* the previous decl in this scope */
181 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
182 unsigned int depth : 28; /* depth of this scope */
183 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
184 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
187 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
188 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
189 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
190 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
192 #define I_SYMBOL_BINDING(node) \
193 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->symbol_binding)
194 #define I_SYMBOL_DECL(node) \
195 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
197 #define I_TAG_BINDING(node) \
198 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->tag_binding)
199 #define I_TAG_DECL(node) \
200 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
202 #define I_LABEL_BINDING(node) \
203 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->label_binding)
204 #define I_LABEL_DECL(node) \
205 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
207 /* Each C symbol points to three linked lists of c_binding structures.
208 These describe the values of the identifier in the three different
209 namespaces defined by the language. */
211 struct lang_identifier GTY(())
213 struct c_common_identifier common_id;
214 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
215 struct c_binding *tag_binding; /* struct/union/enum tags */
216 struct c_binding *label_binding; /* labels */
219 /* Validate c-lang.c's assumptions. */
220 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
221 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
223 /* The resulting tree type. */
226 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
227 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)")))
229 union tree_node GTY ((tag ("0"),
230 desc ("tree_node_structure (&%h)")))
232 struct lang_identifier GTY ((tag ("1"))) identifier;
235 /* Each c_scope structure describes the complete contents of one
236 scope. Four scopes are distinguished specially: the innermost or
237 current scope, the innermost function scope, the file scope (always
238 the second to outermost) and the outermost or external scope.
240 Most declarations are recorded in the current scope.
242 All normal label declarations are recorded in the innermost
243 function scope, as are bindings of undeclared identifiers to
244 error_mark_node. (GCC permits nested functions as an extension,
245 hence the 'innermost' qualifier.) Explicitly declared labels
246 (using the __label__ extension) appear in the current scope.
248 Being in the file scope (current_scope == file_scope) causes
249 special behavior in several places below. Also, under some
250 conditions the Objective-C front end records declarations in the
251 file scope even though that isn't the current scope.
253 All declarations with external linkage are recorded in the external
254 scope, even if they aren't visible there; this models the fact that
255 such declarations are visible to the entire program, and (with a
256 bit of cleverness, see pushdecl) allows diagnosis of some violations
257 of C99 6.2.2p7 and 6.2.7p2:
259 If, within the same translation unit, the same identifier appears
260 with both internal and external linkage, the behavior is
263 All declarations that refer to the same object or function shall
264 have compatible type; otherwise, the behavior is undefined.
266 Initially only the built-in declarations, which describe compiler
267 intrinsic functions plus a subset of the standard library, are in
270 The order of the blocks list matters, and it is frequently appended
271 to. To avoid having to walk all the way to the end of the list on
272 each insertion, or reverse the list later, we maintain a pointer to
273 the last list entry. (FIXME: It should be feasible to use a reversed
276 The bindings list is strictly in reverse order of declarations;
277 pop_scope relies on this. */
280 struct c_scope GTY((chain_next ("%h.outer")))
282 /* The scope containing this one. */
283 struct c_scope *outer;
285 /* The next outermost function scope. */
286 struct c_scope *outer_function;
288 /* All bindings in this scope. */
289 struct c_binding *bindings;
291 /* For each scope (except the global one), a chain of BLOCK nodes
292 for all the scopes that were entered and exited one level down. */
296 /* The depth of this scope. Used to keep the ->shadowed chain of
297 bindings sorted innermost to outermost. */
298 unsigned int depth : 28;
300 /* True if we are currently filling this scope with parameter
302 BOOL_BITFIELD parm_flag : 1;
304 /* True if we already complained about forward parameter decls
305 in this scope. This prevents double warnings on
306 foo (int a; int b; ...) */
307 BOOL_BITFIELD warned_forward_parm_decls : 1;
309 /* True if this is the outermost block scope of a function body.
310 This scope contains the parameters, the local variables declared
311 in the outermost block, and all the labels (except those in
312 nested functions, or declared at block scope with __label__). */
313 BOOL_BITFIELD function_body : 1;
315 /* True means make a BLOCK for this scope no matter what. */
316 BOOL_BITFIELD keep : 1;
319 /* The scope currently in effect. */
321 static GTY(()) struct c_scope *current_scope;
323 /* The innermost function scope. Ordinary (not explicitly declared)
324 labels, bindings to error_mark_node, and the lazily-created
325 bindings of __func__ and its friends get this scope. */
327 static GTY(()) struct c_scope *current_function_scope;
329 /* The C file scope. This is reset for each input translation unit. */
331 static GTY(()) struct c_scope *file_scope;
333 /* The outermost scope. This is used for all declarations with
334 external linkage, and only these, hence the name. */
336 static GTY(()) struct c_scope *external_scope;
338 /* A chain of c_scope structures awaiting reuse. */
340 static GTY((deletable)) struct c_scope *scope_freelist;
342 /* A chain of c_binding structures awaiting reuse. */
344 static GTY((deletable)) struct c_binding *binding_freelist;
346 /* Append VAR to LIST in scope SCOPE. */
347 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
348 struct c_scope *s_ = (scope); \
350 if (s_->list##_last) \
351 TREE_CHAIN (s_->list##_last) = d_; \
354 s_->list##_last = d_; \
357 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
358 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
359 struct c_scope *t_ = (tscope); \
360 struct c_scope *f_ = (fscope); \
362 TREE_CHAIN (t_->to##_last) = f_->from; \
365 t_->to##_last = f_->from##_last; \
368 /* True means unconditionally make a BLOCK for the next scope pushed. */
370 static bool keep_next_level_flag;
372 /* True means the next call to push_scope will be the outermost scope
373 of a function body, so do not push a new scope, merely cease
374 expecting parameter decls. */
376 static bool next_is_function_body;
378 /* Functions called automatically at the beginning and end of execution. */
380 static GTY(()) tree static_ctors;
381 static GTY(()) tree static_dtors;
383 /* Forward declarations. */
384 static tree lookup_name_in_scope (tree, struct c_scope *);
385 static tree c_make_fname_decl (tree, int);
386 static tree grokdeclarator (tree, tree, enum decl_context, int, tree *);
387 static tree grokparms (tree, int);
388 static void layout_array_type (tree);
390 /* States indicating how grokdeclarator() should handle declspecs marked
391 with __attribute__((deprecated)). An object declared as
392 __attribute__((deprecated)) suppresses warnings of uses of other
395 enum deprecated_states {
400 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
403 c_print_identifier (FILE *file, tree node, int indent)
405 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
406 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
407 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
408 if (C_IS_RESERVED_WORD (node))
410 tree rid = ridpointers[C_RID_CODE (node)];
411 indent_to (file, indent + 4);
412 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
413 (void *) rid, IDENTIFIER_POINTER (rid));
417 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
418 which may be any of several kinds of DECL or TYPE or error_mark_node,
419 in the scope SCOPE. */
421 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
423 struct c_binding *b, **here;
425 if (binding_freelist)
427 b = binding_freelist;
428 binding_freelist = b->prev;
431 b = ggc_alloc (sizeof (struct c_binding));
436 b->depth = scope->depth;
437 b->invisible = invisible;
440 b->prev = scope->bindings;
446 switch (TREE_CODE (decl))
448 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
451 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
457 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
463 /* Locate the appropriate place in the chain of shadowed decls
464 to insert this binding. Normally, scope == current_scope and
465 this does nothing. */
466 while (*here && (*here)->depth > scope->depth)
467 here = &(*here)->shadowed;
473 /* Clear the binding structure B, stick it on the binding_freelist,
474 and return the former value of b->prev. This is used by pop_scope
475 and get_parm_info to iterate destructively over all the bindings
476 from a given scope. */
477 static struct c_binding *
478 free_binding_and_advance (struct c_binding *b)
480 struct c_binding *prev = b->prev;
482 memset (b, 0, sizeof (struct c_binding));
483 b->prev = binding_freelist;
484 binding_freelist = b;
490 /* Hook called at end of compilation to assume 1 elt
491 for a file-scope tentative array defn that wasn't complete before. */
494 c_finish_incomplete_decl (tree decl)
496 if (TREE_CODE (decl) == VAR_DECL)
498 tree type = TREE_TYPE (decl);
499 if (type != error_mark_node
500 && TREE_CODE (type) == ARRAY_TYPE
501 && ! DECL_EXTERNAL (decl)
502 && TYPE_DOMAIN (type) == 0)
504 warning ("%Jarray '%D' assumed to have one element", decl, decl);
506 complete_array_type (type, NULL_TREE, 1);
508 layout_decl (decl, 0);
513 /* The Objective-C front-end often needs to determine the current scope. */
516 get_current_scope (void)
518 return current_scope;
521 /* The following function is used only by Objective-C. It needs to live here
522 because it accesses the innards of c_scope. */
525 objc_mark_locals_volatile (void *enclosing_blk)
527 struct c_scope *scope;
530 for (scope = current_scope;
531 scope && scope != enclosing_blk;
532 scope = scope->outer)
534 for (b = scope->bindings; b; b = b->prev)
536 if (TREE_CODE (b->decl) == VAR_DECL
537 || TREE_CODE (b->decl) == PARM_DECL)
539 C_DECL_REGISTER (b->decl) = 0;
540 DECL_REGISTER (b->decl) = 0;
541 TREE_THIS_VOLATILE (b->decl) = 1;
545 /* Do not climb up past the current function. */
546 if (scope->function_body)
551 /* Nonzero if we are currently in file scope. */
554 global_bindings_p (void)
556 return current_scope == file_scope && !c_override_global_bindings_to_false;
560 keep_next_level (void)
562 keep_next_level_flag = true;
565 /* Identify this scope as currently being filled with parameters. */
568 declare_parm_level (void)
570 current_scope->parm_flag = true;
576 if (next_is_function_body)
578 /* This is the transition from the parameters to the top level
579 of the function body. These are the same scope
580 (C99 6.2.1p4,6) so we do not push another scope structure.
581 next_is_function_body is set only by store_parm_decls, which
582 in turn is called when and only when we are about to
583 encounter the opening curly brace for the function body.
585 The outermost block of a function always gets a BLOCK node,
586 because the debugging output routines expect that each
587 function has at least one BLOCK. */
588 current_scope->parm_flag = false;
589 current_scope->function_body = true;
590 current_scope->keep = true;
591 current_scope->outer_function = current_function_scope;
592 current_function_scope = current_scope;
594 keep_next_level_flag = false;
595 next_is_function_body = false;
599 struct c_scope *scope;
602 scope = scope_freelist;
603 scope_freelist = scope->outer;
606 scope = ggc_alloc_cleared (sizeof (struct c_scope));
608 scope->keep = keep_next_level_flag;
609 scope->outer = current_scope;
610 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
612 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
614 if (current_scope && scope->depth == 0)
617 sorry ("GCC supports only %u nested scopes\n", scope->depth);
620 current_scope = scope;
621 keep_next_level_flag = false;
625 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
628 set_type_context (tree type, tree context)
630 for (type = TYPE_MAIN_VARIANT (type); type;
631 type = TYPE_NEXT_VARIANT (type))
632 TYPE_CONTEXT (type) = context;
635 /* Exit a scope. Restore the state of the identifier-decl mappings
636 that were in effect when this scope was entered. Return a BLOCK
637 node containing all the DECLs in this scope that are of interest
638 to debug info generation. */
643 struct c_scope *scope = current_scope;
644 tree block, context, p;
647 bool functionbody = scope->function_body;
648 bool keep = functionbody || scope->keep || scope->bindings;
650 /* If appropriate, create a BLOCK to record the decls for the life
655 block = make_node (BLOCK);
656 BLOCK_SUBBLOCKS (block) = scope->blocks;
657 TREE_USED (block) = 1;
659 /* In each subblock, record that this is its superior. */
660 for (p = scope->blocks; p; p = TREE_CHAIN (p))
661 BLOCK_SUPERCONTEXT (p) = block;
663 BLOCK_VARS (block) = 0;
666 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
667 scope must be set so that they point to the appropriate
668 construct, i.e. either to the current FUNCTION_DECL node, or
669 else to the BLOCK node we just constructed.
671 Note that for tagged types whose scope is just the formal
672 parameter list for some function type specification, we can't
673 properly set their TYPE_CONTEXTs here, because we don't have a
674 pointer to the appropriate FUNCTION_TYPE node readily available
675 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
676 type nodes get set in `grokdeclarator' as soon as we have created
677 the FUNCTION_TYPE node which will represent the "scope" for these
678 "parameter list local" tagged types. */
679 if (scope->function_body)
680 context = current_function_decl;
681 else if (scope == file_scope)
683 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
684 TREE_CHAIN (file_decl) = all_translation_units;
685 all_translation_units = file_decl;
691 /* Clear all bindings in this scope. */
692 for (b = scope->bindings; b; b = free_binding_and_advance (b))
695 switch (TREE_CODE (p))
698 /* Warnings for unused labels, errors for undefined labels. */
699 if (TREE_USED (p) && !DECL_INITIAL (p))
701 error ("%Jlabel `%D' used but not defined", p, p);
702 DECL_INITIAL (p) = error_mark_node;
704 else if (!TREE_USED (p) && warn_unused_label)
706 if (DECL_INITIAL (p))
707 warning ("%Jlabel `%D' defined but not used", p, p);
709 warning ("%Jlabel `%D' declared but not defined", p, p);
711 /* Labels go in BLOCK_VARS. */
712 TREE_CHAIN (p) = BLOCK_VARS (block);
713 BLOCK_VARS (block) = p;
715 #ifdef ENABLE_CHECKING
716 if (I_LABEL_BINDING (b->id) != b) abort ();
718 I_LABEL_BINDING (b->id) = b->shadowed;
724 set_type_context (p, context);
726 /* Types may not have tag-names, in which case the type
727 appears in the bindings list with b->id NULL. */
730 #ifdef ENABLE_CHECKING
731 if (I_TAG_BINDING (b->id) != b) abort ();
733 I_TAG_BINDING (b->id) = b->shadowed;
738 /* Propagate TREE_ADDRESSABLE from nested functions to their
739 containing functions. */
740 if (! TREE_ASM_WRITTEN (p)
741 && DECL_INITIAL (p) != 0
742 && TREE_ADDRESSABLE (p)
743 && DECL_ABSTRACT_ORIGIN (p) != 0
744 && DECL_ABSTRACT_ORIGIN (p) != p)
745 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
749 /* Warnings for unused variables. */
750 if (warn_unused_variable
752 && !DECL_IN_SYSTEM_HEADER (p)
754 && !DECL_ARTIFICIAL (p)
755 && (scope != file_scope
756 || (TREE_STATIC (p) && !TREE_PUBLIC (p)
757 && !TREE_THIS_VOLATILE (p)))
758 && scope != external_scope)
759 warning ("%Junused variable `%D'", p, p);
765 /* All of these go in BLOCK_VARS, but only if this is the
766 binding in the home scope. */
769 TREE_CHAIN (p) = BLOCK_VARS (block);
770 BLOCK_VARS (block) = p;
772 /* If this is the file scope, and we are processing more
773 than one translation unit in this compilation, set
774 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
775 This makes same_translation_unit_p work, and causes
776 static declarations to be given disambiguating suffixes. */
777 if (scope == file_scope && num_in_fnames > 1)
779 DECL_CONTEXT (p) = context;
780 if (TREE_CODE (p) == TYPE_DECL)
781 set_type_context (TREE_TYPE (p), context);
785 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
786 already been put there by store_parm_decls. Unused-
787 parameter warnings are handled by function.c.
788 error_mark_node obviously does not go in BLOCK_VARS and
789 does not get unused-variable warnings. */
792 /* It is possible for a decl not to have a name. We get
793 here with b->id NULL in this case. */
796 #ifdef ENABLE_CHECKING
797 if (I_SYMBOL_BINDING (b->id) != b) abort ();
799 I_SYMBOL_BINDING (b->id) = b->shadowed;
809 /* Dispose of the block that we just made inside some higher level. */
810 if ((scope->function_body || scope == file_scope) && context)
812 DECL_INITIAL (context) = block;
813 BLOCK_SUPERCONTEXT (block) = context;
815 else if (scope->outer)
818 SCOPE_LIST_APPEND (scope->outer, blocks, block);
819 /* If we did not make a block for the scope just exited, any
820 blocks made for inner scopes must be carried forward so they
821 will later become subblocks of something else. */
822 else if (scope->blocks)
823 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
826 /* Pop the current scope, and free the structure for reuse. */
827 current_scope = scope->outer;
828 if (scope->function_body)
829 current_function_scope = scope->outer_function;
831 memset (scope, 0, sizeof (struct c_scope));
832 scope->outer = scope_freelist;
833 scope_freelist = scope;
839 push_file_scope (void)
847 file_scope = current_scope;
849 start_fname_decls ();
851 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
852 bind (DECL_NAME (decl), decl, file_scope,
853 /*invisible=*/false, /*nested=*/true);
857 pop_file_scope (void)
859 /* In case there were missing closebraces, get us back to the global
861 while (current_scope != file_scope)
864 /* __FUNCTION__ is defined at file scope (""). This
865 call may not be necessary as my tests indicate it
866 still works without it. */
867 finish_fname_decls ();
869 /* This is the point to write out a PCH if we're doing that.
870 In that case we do not want to do anything else. */
873 c_common_write_pch ();
877 /* Pop off the file scope and close this translation unit. */
880 cgraph_finalize_compilation_unit ();
883 /* Insert BLOCK at the end of the list of subblocks of the current
884 scope. This is used when a BIND_EXPR is expanded, to handle the
885 BLOCK node inside the BIND_EXPR. */
888 insert_block (tree block)
890 TREE_USED (block) = 1;
891 SCOPE_LIST_APPEND (current_scope, blocks, block);
894 /* Push a definition or a declaration of struct, union or enum tag "name".
895 "type" should be the type node.
896 We assume that the tag "name" is not already defined.
898 Note that the definition may really be just a forward reference.
899 In that case, the TYPE_SIZE will be zero. */
902 pushtag (tree name, tree type)
904 /* Record the identifier as the type's name if it has none. */
905 if (name && !TYPE_NAME (type))
906 TYPE_NAME (type) = name;
907 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
909 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
910 tagged type we just added to the current scope. This fake
911 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
912 to output a representation of a tagged type, and it also gives
913 us a convenient place to record the "scope start" address for the
916 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
918 /* An approximation for now, so we can tell this is a function-scope tag.
919 This will be updated in pop_scope. */
920 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
923 /* Subroutine of compare_decls. Allow harmless mismatches in return
924 and argument types provided that the type modes match. This function
925 return a unified type given a suitable match, and 0 otherwise. */
928 match_builtin_function_types (tree newtype, tree oldtype)
930 tree newrettype, oldrettype;
931 tree newargs, oldargs;
932 tree trytype, tryargs;
934 /* Accept the return type of the new declaration if same modes. */
935 oldrettype = TREE_TYPE (oldtype);
936 newrettype = TREE_TYPE (newtype);
938 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
941 oldargs = TYPE_ARG_TYPES (oldtype);
942 newargs = TYPE_ARG_TYPES (newtype);
945 while (oldargs || newargs)
949 || ! TREE_VALUE (oldargs)
950 || ! TREE_VALUE (newargs)
951 || TYPE_MODE (TREE_VALUE (oldargs))
952 != TYPE_MODE (TREE_VALUE (newargs)))
955 oldargs = TREE_CHAIN (oldargs);
956 newargs = TREE_CHAIN (newargs);
959 trytype = build_function_type (newrettype, tryargs);
960 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
963 /* Subroutine of diagnose_mismatched_decls. Check for function type
964 mismatch involving an empty arglist vs a nonempty one and give clearer
967 diagnose_arglist_conflict (tree newdecl, tree olddecl,
968 tree newtype, tree oldtype)
972 if (TREE_CODE (olddecl) != FUNCTION_DECL
973 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
974 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
976 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
979 t = TYPE_ARG_TYPES (oldtype);
981 t = TYPE_ARG_TYPES (newtype);
982 for (; t; t = TREE_CHAIN (t))
984 tree type = TREE_VALUE (t);
986 if (TREE_CHAIN (t) == 0
987 && TYPE_MAIN_VARIANT (type) != void_type_node)
989 inform ("a parameter list with an ellipsis can't match "
990 "an empty parameter name list declaration");
994 if (c_type_promotes_to (type) != type)
996 inform ("an argument type that has a default promotion can't match "
997 "an empty parameter name list declaration");
1003 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1004 old-style function definition, NEWDECL is a prototype declaration.
1005 Diagnose inconsistencies in the argument list. Returns TRUE if
1006 the prototype is compatible, FALSE if not. */
1008 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1010 tree newargs, oldargs;
1013 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
1014 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
1016 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1017 newargs = TYPE_ARG_TYPES (newtype);
1022 tree oldargtype = TREE_VALUE (oldargs);
1023 tree newargtype = TREE_VALUE (newargs);
1025 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1028 /* Reaching the end of just one list means the two decls don't
1029 agree on the number of arguments. */
1030 if (END_OF_ARGLIST (oldargtype))
1032 error ("%Jprototype for '%D' declares more arguments "
1033 "than previous old-style definition", newdecl, newdecl);
1036 else if (END_OF_ARGLIST (newargtype))
1038 error ("%Jprototype for '%D' declares fewer arguments "
1039 "than previous old-style definition", newdecl, newdecl);
1043 /* Type for passing arg must be consistent with that declared
1045 else if (! comptypes (oldargtype, newargtype))
1047 error ("%Jprototype for '%D' declares arg %d with incompatible type",
1048 newdecl, newdecl, i);
1052 oldargs = TREE_CHAIN (oldargs);
1053 newargs = TREE_CHAIN (newargs);
1057 /* If we get here, no errors were found, but do issue a warning
1058 for this poor-style construct. */
1059 warning ("%Jprototype for '%D' follows non-prototype definition",
1062 #undef END_OF_ARGLIST
1065 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1066 first in a pair of mismatched declarations, using the diagnostic
1069 locate_old_decl (tree decl, void (*diag)(const char *, ...))
1071 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1073 else if (DECL_INITIAL (decl))
1074 diag (N_("%Jprevious definition of '%D' was here"), decl, decl);
1075 else if (C_DECL_IMPLICIT (decl))
1076 diag (N_("%Jprevious implicit declaration of '%D' was here"), decl, decl);
1078 diag (N_("%Jprevious declaration of '%D' was here"), decl, decl);
1081 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1082 Returns true if the caller should proceed to merge the two, false
1083 if OLDDECL should simply be discarded. As a side effect, issues
1084 all necessary diagnostics for invalid or poor-style combinations.
1085 If it returns true, writes the types of NEWDECL and OLDDECL to
1086 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1087 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1090 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1091 tree *newtypep, tree *oldtypep)
1093 tree newtype, oldtype;
1094 bool pedwarned = false;
1095 bool warned = false;
1097 /* If we have error_mark_node for either decl or type, just discard
1098 the previous decl - we're in an error cascade already. */
1099 if (olddecl == error_mark_node || newdecl == error_mark_node)
1101 *oldtypep = oldtype = TREE_TYPE (olddecl);
1102 *newtypep = newtype = TREE_TYPE (newdecl);
1103 if (oldtype == error_mark_node || newtype == error_mark_node)
1106 /* Two different categories of symbol altogether. This is an error
1107 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1108 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1110 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1111 && DECL_BUILT_IN (olddecl)
1112 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1114 error ("%J'%D' redeclared as different kind of symbol",
1116 locate_old_decl (olddecl, error);
1118 else if (TREE_PUBLIC (newdecl))
1119 warning ("%Jbuilt-in function '%D' declared as non-function",
1121 else if (warn_shadow)
1122 warning ("%Jdeclaration of '%D' shadows a built-in function",
1127 if (!comptypes (oldtype, newtype))
1129 if (TREE_CODE (olddecl) == FUNCTION_DECL
1130 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1132 /* Accept harmless mismatch in function types.
1133 This is for the ffs and fprintf builtins. */
1134 tree trytype = match_builtin_function_types (newtype, oldtype);
1136 if (trytype && comptypes (newtype, trytype))
1137 *oldtypep = oldtype = trytype;
1140 /* If types don't match for a built-in, throw away the
1141 built-in. No point in calling locate_old_decl here, it
1142 won't print anything. */
1143 warning ("%Jconflicting types for built-in function '%D'",
1148 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1149 && DECL_IS_BUILTIN (olddecl))
1151 /* A conflicting function declaration for a predeclared
1152 function that isn't actually built in. Objective C uses
1153 these. The new declaration silently overrides everything
1154 but the volatility (i.e. noreturn) indication. See also
1155 below. FIXME: Make Objective C use normal builtins. */
1156 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1159 /* Permit void foo (...) to match int foo (...) if the latter is
1160 the definition and implicit int was used. See
1161 c-torture/compile/920625-2.c. */
1162 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1163 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1164 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1165 && C_FUNCTION_IMPLICIT_INT (newdecl))
1167 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
1168 /* Make sure we keep void as the return type. */
1169 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1170 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1175 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1176 error ("%J conflicting type qualifiers for '%D'", newdecl, newdecl);
1178 error ("%Jconflicting types for '%D'", newdecl, newdecl);
1179 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1180 locate_old_decl (olddecl, error);
1185 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1186 but silently ignore the redeclaration if either is in a system
1187 header. (Conflicting redeclarations were handled above.) */
1188 if (TREE_CODE (newdecl) == TYPE_DECL)
1190 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1191 return true; /* Allow OLDDECL to continue in use. */
1193 error ("%Jredefinition of typedef '%D'", newdecl, newdecl);
1194 locate_old_decl (olddecl, error);
1198 /* Function declarations can either be 'static' or 'extern' (no
1199 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1200 can never conflict with each other on account of linkage (6.2.2p4).
1201 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1202 two definitions if one is 'extern inline' and one is not. The non-
1203 extern-inline definition supersedes the extern-inline definition. */
1204 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1206 /* If you declare a built-in function name as static, or
1207 define the built-in with an old-style definition (so we
1208 can't validate the argument list) the built-in definition is
1209 overridden, but optionally warn this was a bad choice of name. */
1210 if (DECL_BUILT_IN (olddecl)
1211 && !C_DECL_DECLARED_BUILTIN (olddecl)
1212 && (!TREE_PUBLIC (newdecl)
1213 || (DECL_INITIAL (newdecl)
1214 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1217 warning ("%Jdeclaration of '%D' shadows a built-in function",
1219 /* Discard the old built-in function. */
1223 if (DECL_INITIAL (newdecl))
1225 if (DECL_INITIAL (olddecl)
1226 && !(DECL_DECLARED_INLINE_P (olddecl)
1227 && DECL_EXTERNAL (olddecl)
1228 && !(DECL_DECLARED_INLINE_P (newdecl)
1229 && DECL_EXTERNAL (newdecl)
1230 && same_translation_unit_p (olddecl, newdecl))))
1232 error ("%Jredefinition of '%D'", newdecl, newdecl);
1233 locate_old_decl (olddecl, error);
1237 /* If we have a prototype after an old-style function definition,
1238 the argument types must be checked specially. */
1239 else if (DECL_INITIAL (olddecl)
1240 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1241 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1242 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1244 locate_old_decl (olddecl, error);
1247 /* A non-static declaration (even an "extern") followed by a
1248 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1249 The same is true for a static forward declaration at block
1250 scope followed by a non-static declaration/definition at file
1251 scope. Static followed by non-static at the same scope is
1252 not undefined behavior, and is the most convenient way to get
1253 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1254 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1255 we do diagnose it if -Wtraditional. */
1256 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1258 /* Two exceptions to the rule. If olddecl is an extern
1259 inline, or a predeclared function that isn't actually
1260 built in, newdecl silently overrides olddecl. The latter
1261 occur only in Objective C; see also above. (FIXME: Make
1262 Objective C use normal builtins.) */
1263 if (!DECL_IS_BUILTIN (olddecl)
1264 && !(DECL_EXTERNAL (olddecl)
1265 && DECL_DECLARED_INLINE_P (olddecl)))
1267 error ("%Jstatic declaration of '%D' follows "
1268 "non-static declaration", newdecl, newdecl);
1269 locate_old_decl (olddecl, error);
1273 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1275 if (DECL_CONTEXT (olddecl))
1277 error ("%Jnon-static declaration of '%D' follows "
1278 "static declaration", newdecl, newdecl);
1279 locate_old_decl (olddecl, error);
1282 else if (warn_traditional)
1284 warning ("%Jnon-static declaration of '%D' follows "
1285 "static declaration", newdecl, newdecl);
1290 else if (TREE_CODE (newdecl) == VAR_DECL)
1292 /* Only variables can be thread-local, and all declarations must
1293 agree on this property. */
1294 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1296 if (DECL_THREAD_LOCAL (newdecl))
1297 error ("%Jthread-local declaration of '%D' follows "
1298 "non-thread-local declaration", newdecl, newdecl);
1300 error ("%Jnon-thread-local declaration of '%D' follows "
1301 "thread-local declaration", newdecl, newdecl);
1303 locate_old_decl (olddecl, error);
1307 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1308 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1310 error ("%Jredefinition of '%D'", newdecl, newdecl);
1311 locate_old_decl (olddecl, error);
1315 /* Objects declared at file scope: if the first declaration had
1316 external linkage (even if it was an external reference) the
1317 second must have external linkage as well, or the behavior is
1318 undefined. If the first declaration had internal linkage, then
1319 the second must too, or else be an external reference (in which
1320 case the composite declaration still has internal linkage).
1321 As for function declarations, we warn about the static-then-
1322 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1323 if (DECL_FILE_SCOPE_P (newdecl)
1324 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1326 if (DECL_EXTERNAL (newdecl))
1328 if (warn_traditional)
1330 warning ("%Jnon-static declaration of '%D' follows "
1331 "static declaration", newdecl, newdecl);
1337 if (TREE_PUBLIC (newdecl))
1338 error ("%Jnon-static declaration of '%D' follows "
1339 "static declaration", newdecl, newdecl);
1341 error ("%Jstatic declaration of '%D' follows "
1342 "non-static declaration", newdecl, newdecl);
1344 locate_old_decl (olddecl, error);
1348 /* Two objects with the same name declared at the same block
1349 scope must both be external references (6.7p3). */
1350 else if (!DECL_FILE_SCOPE_P (newdecl)
1351 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl)
1352 && (!DECL_EXTERNAL (newdecl) || !DECL_EXTERNAL (olddecl)))
1354 if (DECL_EXTERNAL (newdecl))
1355 error ("%Jextern declaration of '%D' follows "
1356 "declaration with no linkage", newdecl, newdecl);
1357 else if (DECL_EXTERNAL (olddecl))
1358 error ("%Jdeclaration of '%D' with no linkage follows "
1359 "extern declaration", newdecl, newdecl);
1361 error ("%Jredeclaration of '%D' with no linkage",
1364 locate_old_decl (olddecl, error);
1370 /* All decls must agree on a non-default visibility. */
1371 if (DECL_VISIBILITY (newdecl) != VISIBILITY_DEFAULT
1372 && DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT
1373 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1375 warning ("%Jredeclaration of '%D' with different visibility "
1376 "(old visibility preserved)", newdecl, newdecl);
1380 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1382 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1383 if (DECL_DECLARED_INLINE_P (newdecl)
1384 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1386 warning ("%Jinline declaration of '%D' follows "
1387 "declaration with attribute noinline", newdecl, newdecl);
1390 else if (DECL_DECLARED_INLINE_P (olddecl)
1391 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1393 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1394 "inline declaration ", newdecl, newdecl);
1398 /* Inline declaration after use or definition.
1399 ??? Should we still warn about this now we have unit-at-a-time
1400 mode and can get it right?
1401 Definitely don't complain if the decls are in different translation
1403 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1404 && same_translation_unit_p (olddecl, newdecl))
1406 if (TREE_USED (olddecl))
1408 warning ("%J'%D' declared inline after being called",
1412 else if (DECL_INITIAL (olddecl))
1414 warning ("%J'%D' declared inline after its definition",
1420 else /* PARM_DECL, VAR_DECL */
1422 /* Redeclaration of a parameter is a constraint violation (this is
1423 not explicitly stated, but follows from C99 6.7p3 [no more than
1424 one declaration of the same identifier with no linkage in the
1425 same scope, except type tags] and 6.2.2p6 [parameters have no
1426 linkage]). We must check for a forward parameter declaration,
1427 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1428 an extension, the mandatory diagnostic for which is handled by
1429 mark_forward_parm_decls. */
1431 if (TREE_CODE (newdecl) == PARM_DECL
1432 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1434 error ("%Jredefinition of parameter '%D'", newdecl, newdecl);
1435 locate_old_decl (olddecl, error);
1440 /* Optional warning for completely redundant decls. */
1441 if (!warned && !pedwarned
1442 && warn_redundant_decls
1443 /* Don't warn about a function declaration followed by a
1445 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1446 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1447 /* Don't warn about redundant redeclarations of builtins. */
1448 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1449 && !DECL_BUILT_IN (newdecl)
1450 && DECL_BUILT_IN (olddecl)
1451 && !C_DECL_DECLARED_BUILTIN (olddecl))
1452 /* Don't warn about an extern followed by a definition. */
1453 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1454 /* Don't warn about forward parameter decls. */
1455 && !(TREE_CODE (newdecl) == PARM_DECL
1456 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1458 warning ("%Jredundant redeclaration of '%D'", newdecl, newdecl);
1462 /* Report location of previous decl/defn in a consistent manner. */
1463 if (warned || pedwarned)
1464 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1469 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1470 consistent with OLDDECL, but carries new information. Merge the
1471 new information into OLDDECL. This function issues no
1475 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1477 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1478 && DECL_INITIAL (newdecl) != 0);
1480 /* For real parm decl following a forward decl, rechain the old decl
1481 in its new location and clear TREE_ASM_WRITTEN (it's not a
1482 forward decl anymore). */
1483 if (TREE_CODE (newdecl) == PARM_DECL
1484 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1486 struct c_binding *b, **here;
1488 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1489 if ((*here)->decl == olddecl)
1496 b->prev = current_scope->bindings;
1497 current_scope->bindings = b;
1499 TREE_ASM_WRITTEN (olddecl) = 0;
1502 DECL_ATTRIBUTES (newdecl)
1503 = targetm.merge_decl_attributes (olddecl, newdecl);
1505 /* Merge the data types specified in the two decls. */
1507 = TREE_TYPE (olddecl)
1508 = composite_type (newtype, oldtype);
1510 /* Lay the type out, unless already done. */
1511 if (oldtype != TREE_TYPE (newdecl))
1513 if (TREE_TYPE (newdecl) != error_mark_node)
1514 layout_type (TREE_TYPE (newdecl));
1515 if (TREE_CODE (newdecl) != FUNCTION_DECL
1516 && TREE_CODE (newdecl) != TYPE_DECL
1517 && TREE_CODE (newdecl) != CONST_DECL)
1518 layout_decl (newdecl, 0);
1522 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1523 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1524 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1525 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1526 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1527 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1529 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1530 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1534 /* Keep the old rtl since we can safely use it. */
1535 COPY_DECL_RTL (olddecl, newdecl);
1537 /* Merge the type qualifiers. */
1538 if (TREE_READONLY (newdecl))
1539 TREE_READONLY (olddecl) = 1;
1541 if (TREE_THIS_VOLATILE (newdecl))
1543 TREE_THIS_VOLATILE (olddecl) = 1;
1544 if (TREE_CODE (newdecl) == VAR_DECL)
1545 make_var_volatile (newdecl);
1548 /* Keep source location of definition rather than declaration. */
1549 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1550 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1552 /* Merge the unused-warning information. */
1553 if (DECL_IN_SYSTEM_HEADER (olddecl))
1554 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1555 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1556 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1558 /* Merge the initialization information. */
1559 if (DECL_INITIAL (newdecl) == 0)
1560 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1562 /* Merge the section attribute.
1563 We want to issue an error if the sections conflict but that must be
1564 done later in decl_attributes since we are called before attributes
1566 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1567 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1569 /* Copy the assembler name.
1570 Currently, it can only be defined in the prototype. */
1571 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1573 /* If either declaration has a nondefault visibility, use it. */
1574 if (DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT)
1575 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1577 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1579 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1580 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1581 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1582 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1583 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1584 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1585 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1586 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1587 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1590 /* Merge the storage class information. */
1591 merge_weak (newdecl, olddecl);
1593 /* For functions, static overrides non-static. */
1594 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1596 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1597 /* This is since we don't automatically
1598 copy the attributes of NEWDECL into OLDDECL. */
1599 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1600 /* If this clears `static', clear it in the identifier too. */
1601 if (! TREE_PUBLIC (olddecl))
1602 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1604 if (DECL_EXTERNAL (newdecl))
1606 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1607 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1609 /* An extern decl does not override previous storage class. */
1610 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1611 if (! DECL_EXTERNAL (newdecl))
1613 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1614 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1619 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1620 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1623 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1625 /* If we're redefining a function previously defined as extern
1626 inline, make sure we emit debug info for the inline before we
1627 throw it away, in case it was inlined into a function that hasn't
1628 been written out yet. */
1629 if (new_is_definition && DECL_INITIAL (olddecl))
1631 if (TREE_USED (olddecl)
1632 /* In unit-at-a-time mode we never inline re-defined extern
1633 inline functions. */
1634 && !flag_unit_at_a_time
1635 && cgraph_function_possibly_inlined_p (olddecl))
1636 (*debug_hooks->outlining_inline_function) (olddecl);
1638 /* The new defn must not be inline. */
1639 DECL_INLINE (newdecl) = 0;
1640 DECL_UNINLINABLE (newdecl) = 1;
1644 /* If either decl says `inline', this fn is inline,
1645 unless its definition was passed already. */
1646 if (DECL_DECLARED_INLINE_P (newdecl)
1647 || DECL_DECLARED_INLINE_P (olddecl))
1648 DECL_DECLARED_INLINE_P (newdecl) = 1;
1650 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1651 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1654 if (DECL_BUILT_IN (olddecl))
1656 /* If redeclaring a builtin function, it stays built in.
1657 But it gets tagged as having been declared. */
1658 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1659 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1660 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1663 /* Also preserve various other info from the definition. */
1664 if (! new_is_definition)
1666 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1667 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1668 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1669 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1670 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1672 /* Set DECL_INLINE on the declaration if we've got a body
1673 from which to instantiate. */
1674 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1676 DECL_INLINE (newdecl) = 1;
1677 DECL_ABSTRACT_ORIGIN (newdecl)
1678 = DECL_ABSTRACT_ORIGIN (olddecl);
1683 /* If a previous declaration said inline, mark the
1684 definition as inlinable. */
1685 if (DECL_DECLARED_INLINE_P (newdecl)
1686 && ! DECL_UNINLINABLE (newdecl))
1687 DECL_INLINE (newdecl) = 1;
1691 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1692 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1694 unsigned olddecl_uid = DECL_UID (olddecl);
1695 tree olddecl_context = DECL_CONTEXT (olddecl);
1697 memcpy ((char *) olddecl + sizeof (struct tree_common),
1698 (char *) newdecl + sizeof (struct tree_common),
1699 sizeof (struct tree_decl) - sizeof (struct tree_common));
1700 DECL_UID (olddecl) = olddecl_uid;
1701 DECL_CONTEXT (olddecl) = olddecl_context;
1704 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1705 so that encode_section_info has a chance to look at the new decl
1706 flags and attributes. */
1707 if (DECL_RTL_SET_P (olddecl)
1708 && (TREE_CODE (olddecl) == FUNCTION_DECL
1709 || (TREE_CODE (olddecl) == VAR_DECL
1710 && TREE_STATIC (olddecl))))
1711 make_decl_rtl (olddecl, NULL);
1714 /* Handle when a new declaration NEWDECL has the same name as an old
1715 one OLDDECL in the same binding contour. Prints an error message
1718 If safely possible, alter OLDDECL to look like NEWDECL, and return
1719 true. Otherwise, return false. */
1722 duplicate_decls (tree newdecl, tree olddecl)
1724 tree newtype = NULL, oldtype = NULL;
1726 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1729 merge_decls (newdecl, olddecl, newtype, oldtype);
1734 /* Check whether decl-node NEW shadows an existing declaration. */
1736 warn_if_shadowing (tree new)
1738 struct c_binding *b;
1740 /* Shadow warnings wanted? */
1742 /* No shadow warnings for internally generated vars. */
1743 || DECL_IS_BUILTIN (new)
1744 /* No shadow warnings for vars made for inlining. */
1745 || DECL_FROM_INLINE (new)
1746 /* Don't warn about the parm names in function declarator
1747 within a function declarator. It would be nice to avoid
1748 warning in any function declarator in a declaration, as
1749 opposed to a definition, but there is no way to tell
1750 it's not a definition at this point. */
1751 || (TREE_CODE (new) == PARM_DECL && current_scope->outer->parm_flag))
1754 /* Is anything being shadowed? Invisible decls do not count. */
1755 for (b = I_SYMBOL_BINDING (DECL_NAME (new)); b; b = b->shadowed)
1756 if (b->decl && b->decl != new && !b->invisible)
1760 if (TREE_CODE (old) == PARM_DECL)
1761 warning ("%Jdeclaration of '%D' shadows a parameter", new, new);
1762 else if (DECL_FILE_SCOPE_P (old))
1763 warning ("%Jdeclaration of '%D' shadows a global declaration",
1765 else if (TREE_CODE (old) == FUNCTION_DECL && DECL_BUILT_IN (old))
1766 warning ("%Jdeclaration of '%D' shadows a built-in function",
1769 warning ("%Jdeclaration of '%D' shadows a previous local", new, new);
1771 if (TREE_CODE (old) != FUNCTION_DECL || !DECL_BUILT_IN (old))
1772 warning ("%Jshadowed declaration is here", old);
1779 /* Subroutine of pushdecl.
1781 X is a TYPE_DECL for a typedef statement. Create a brand new
1782 ..._TYPE node (which will be just a variant of the existing
1783 ..._TYPE node with identical properties) and then install X
1784 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1786 The whole point here is to end up with a situation where each
1787 and every ..._TYPE node the compiler creates will be uniquely
1788 associated with AT MOST one node representing a typedef name.
1789 This way, even though the compiler substitutes corresponding
1790 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1791 early on, later parts of the compiler can always do the reverse
1792 translation and get back the corresponding typedef name. For
1795 typedef struct S MY_TYPE;
1798 Later parts of the compiler might only know that `object' was of
1799 type `struct S' if it were not for code just below. With this
1800 code however, later parts of the compiler see something like:
1802 struct S' == struct S
1803 typedef struct S' MY_TYPE;
1806 And they can then deduce (from the node for type struct S') that
1807 the original object declaration was:
1811 Being able to do this is important for proper support of protoize,
1812 and also for generating precise symbolic debugging information
1813 which takes full account of the programmer's (typedef) vocabulary.
1815 Obviously, we don't want to generate a duplicate ..._TYPE node if
1816 the TYPE_DECL node that we are now processing really represents a
1817 standard built-in type.
1819 Since all standard types are effectively declared at line zero
1820 in the source file, we can easily check to see if we are working
1821 on a standard type by checking the current value of lineno. */
1824 clone_underlying_type (tree x)
1826 if (DECL_IS_BUILTIN (x))
1828 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1829 TYPE_NAME (TREE_TYPE (x)) = x;
1831 else if (TREE_TYPE (x) != error_mark_node
1832 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1834 tree tt = TREE_TYPE (x);
1835 DECL_ORIGINAL_TYPE (x) = tt;
1836 tt = build_type_copy (tt);
1838 TREE_USED (tt) = TREE_USED (x);
1843 /* Record a decl-node X as belonging to the current lexical scope.
1844 Check for errors (such as an incompatible declaration for the same
1845 name already seen in the same scope).
1847 Returns either X or an old decl for the same name.
1848 If an old decl is returned, it may have been smashed
1849 to agree with what X says. */
1854 tree name = DECL_NAME (x);
1855 struct c_scope *scope = current_scope;
1856 struct c_binding *b;
1857 bool nested = false;
1859 /* Functions need the lang_decl data. */
1860 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1861 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1863 /* Must set DECL_CONTEXT for everything not at file scope or
1864 DECL_FILE_SCOPE_P won't work. Local externs don't count
1865 unless they have initializers (which generate code). */
1866 if (current_function_decl
1867 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
1868 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
1869 DECL_CONTEXT (x) = current_function_decl;
1871 /* Anonymous decls are just inserted in the scope. */
1874 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
1878 /* First, see if there is another declaration with the same name in
1879 the current scope. If there is, duplicate_decls may do all the
1880 work for us. If duplicate_decls returns false, that indicates
1881 two incompatible decls in the same scope; we are to silently
1882 replace the old one (duplicate_decls has issued all appropriate
1883 diagnostics). In particular, we should not consider possible
1884 duplicates in the external scope, or shadowing. */
1885 b = I_SYMBOL_BINDING (name);
1886 if (b && B_IN_SCOPE (b, scope))
1888 if (duplicate_decls (x, b->decl))
1891 goto skip_external_and_shadow_checks;
1894 /* All declarations with external linkage, and all external
1895 references, go in the external scope, no matter what scope is
1896 current. However, the binding in that scope is ignored for
1897 purposes of normal name lookup. A separate binding structure is
1898 created in the requested scope; this governs the normal
1899 visibility of the symbol.
1901 The binding in the externals scope is used exclusively for
1902 detecting duplicate declarations of the same object, no matter
1903 what scope they are in; this is what we do here. (C99 6.2.7p2:
1904 All declarations that refer to the same object or function shall
1905 have compatible type; otherwise, the behavior is undefined.) */
1906 if (DECL_EXTERNAL (x) || scope == file_scope)
1908 if (warn_nested_externs
1909 && scope != file_scope
1910 && !DECL_IN_SYSTEM_HEADER (x))
1911 warning ("nested extern declaration of '%D'", x);
1913 while (b && !B_IN_EXTERNAL_SCOPE (b))
1916 /* The point of the same_translation_unit_p check here is,
1917 we want to detect a duplicate decl for a construct like
1918 foo() { extern bar(); } ... static bar(); but not if
1919 they are in different translation units. In any case,
1920 the static does not go in the externals scope. */
1922 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
1923 && duplicate_decls (x, b->decl))
1925 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
1928 else if (TREE_PUBLIC (x))
1930 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
1934 /* Similarly, a declaration of a function with static linkage at
1935 block scope must be checked against any existing declaration
1936 of that function at file scope. */
1937 else if (TREE_CODE (x) == FUNCTION_DECL && scope != file_scope
1938 && !TREE_PUBLIC (x) && !DECL_INITIAL (x))
1940 if (warn_nested_externs && !DECL_IN_SYSTEM_HEADER (x))
1941 warning ("nested static declaration of '%D'", x);
1943 while (b && !B_IN_FILE_SCOPE (b))
1946 if (b && same_translation_unit_p (x, b->decl)
1947 && duplicate_decls (x, b->decl))
1949 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
1954 bind (name, x, file_scope, /*invisible=*/true, /*nested=*/false);
1959 warn_if_shadowing (x);
1961 skip_external_and_shadow_checks:
1962 if (TREE_CODE (x) == TYPE_DECL)
1963 clone_underlying_type (x);
1965 bind (name, x, scope, /*invisible=*/false, nested);
1967 /* If x's type is incomplete because it's based on a
1968 structure or union which has not yet been fully declared,
1969 attach it to that structure or union type, so we can go
1970 back and complete the variable declaration later, if the
1971 structure or union gets fully declared.
1973 If the input is erroneous, we can have error_mark in the type
1974 slot (e.g. "f(void a, ...)") - that doesn't count as an
1976 if (TREE_TYPE (x) != error_mark_node
1977 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1979 tree element = TREE_TYPE (x);
1981 while (TREE_CODE (element) == ARRAY_TYPE)
1982 element = TREE_TYPE (element);
1983 element = TYPE_MAIN_VARIANT (element);
1985 if ((TREE_CODE (element) == RECORD_TYPE
1986 || TREE_CODE (element) == UNION_TYPE)
1987 && (TREE_CODE (x) != TYPE_DECL
1988 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
1989 && !COMPLETE_TYPE_P (element))
1990 C_TYPE_INCOMPLETE_VARS (element)
1991 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
1996 /* Record X as belonging to file scope.
1997 This is used only internally by the Objective-C front end,
1998 and is limited to its needs. duplicate_decls is not called;
1999 if there is any preexisting decl for this identifier, it is an ICE. */
2002 pushdecl_top_level (tree x)
2005 bool nested = false;
2007 if (TREE_CODE (x) != VAR_DECL)
2010 name = DECL_NAME (x);
2012 if (I_SYMBOL_BINDING (name))
2015 if (TREE_PUBLIC (x))
2017 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2021 bind (name, x, file_scope, /*invisible=*/false, nested);
2027 implicit_decl_warning (tree id, tree olddecl)
2029 void (*diag) (const char *, ...);
2030 switch (mesg_implicit_function_declaration)
2033 case 1: diag = warning; break;
2034 case 2: diag = error; break;
2038 diag (N_("implicit declaration of function '%E'"), id);
2040 locate_old_decl (olddecl, diag);
2043 /* Generate an implicit declaration for identifier FUNCTIONID as a
2044 function of type int (). */
2047 implicitly_declare (tree functionid)
2049 tree decl = lookup_name_in_scope (functionid, external_scope);
2053 /* FIXME: Objective-C has weird not-really-builtin functions
2054 which are supposed to be visible automatically. They wind up
2055 in the external scope because they're pushed before the file
2056 scope gets created. Catch this here and rebind them into the
2058 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2060 bind (functionid, decl, file_scope,
2061 /*invisible=*/false, /*nested=*/true);
2066 /* Implicit declaration of a function already declared
2067 (somehow) in a different scope, or as a built-in.
2068 If this is the first time this has happened, warn;
2069 then recycle the old declaration. */
2070 if (!C_DECL_IMPLICIT (decl))
2072 implicit_decl_warning (functionid, decl);
2073 C_DECL_IMPLICIT (decl) = 1;
2075 bind (functionid, decl, current_scope,
2076 /*invisible=*/false, /*nested=*/true);
2081 /* Not seen before. */
2082 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2083 DECL_EXTERNAL (decl) = 1;
2084 TREE_PUBLIC (decl) = 1;
2085 C_DECL_IMPLICIT (decl) = 1;
2086 implicit_decl_warning (functionid, 0);
2088 /* C89 says implicit declarations are in the innermost block.
2089 So we record the decl in the standard fashion. */
2090 decl = pushdecl (decl);
2092 /* No need to call objc_check_decl here - it's a function type. */
2093 rest_of_decl_compilation (decl, NULL, 0, 0);
2095 /* Write a record describing this implicit function declaration
2096 to the prototypes file (if requested). */
2097 gen_aux_info_record (decl, 0, 1, 0);
2099 /* Possibly apply some default attributes to this implicit declaration. */
2100 decl_attributes (&decl, NULL_TREE, 0);
2105 /* Issue an error message for a reference to an undeclared variable
2106 ID, including a reference to a builtin outside of function-call
2107 context. Establish a binding of the identifier to error_mark_node
2108 in an appropriate scope, which will suppress further errors for the
2111 undeclared_variable (tree id)
2113 static bool already = false;
2114 struct c_scope *scope;
2116 if (current_function_decl == 0)
2118 error ("'%E' undeclared here (not in a function)", id);
2119 scope = current_scope;
2123 error ("'%E' undeclared (first use in this function)", id);
2127 error ("(Each undeclared identifier is reported only once");
2128 error ("for each function it appears in.)");
2132 /* If we are parsing old-style parameter decls, current_function_decl
2133 will be nonnull but current_function_scope will be null. */
2134 scope = current_function_scope ? current_function_scope : current_scope;
2136 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2139 /* Subroutine of lookup_label, declare_label, define_label: construct a
2140 LABEL_DECL with all the proper frills. */
2143 make_label (tree name, location_t location)
2145 tree label = build_decl (LABEL_DECL, name, void_type_node);
2147 DECL_CONTEXT (label) = current_function_decl;
2148 DECL_MODE (label) = VOIDmode;
2149 DECL_SOURCE_LOCATION (label) = location;
2154 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2155 Create one if none exists so far for the current function.
2156 This is called when a label is used in a goto expression or
2157 has its address taken. */
2160 lookup_label (tree name)
2164 if (current_function_decl == 0)
2166 error ("label %s referenced outside of any function",
2167 IDENTIFIER_POINTER (name));
2171 /* Use a label already defined or ref'd with this name, but not if
2172 it is inherited from a containing function and wasn't declared
2174 label = I_LABEL_DECL (name);
2175 if (label && (DECL_CONTEXT (label) == current_function_decl
2176 || C_DECLARED_LABEL_FLAG (label)))
2178 /* If the label has only been declared, update its apparent
2179 location to point here, for better diagnostics if it
2180 turns out not to have been defined. */
2181 if (!TREE_USED (label))
2182 DECL_SOURCE_LOCATION (label) = input_location;
2186 /* No label binding for that identifier; make one. */
2187 label = make_label (name, input_location);
2189 /* Ordinary labels go in the current function scope. */
2190 bind (name, label, current_function_scope,
2191 /*invisible=*/false, /*nested=*/false);
2195 /* Make a label named NAME in the current function, shadowing silently
2196 any that may be inherited from containing functions or containing
2197 scopes. This is called for __label__ declarations. */
2200 declare_label (tree name)
2202 struct c_binding *b = I_LABEL_BINDING (name);
2205 /* Check to make sure that the label hasn't already been declared
2207 if (b && B_IN_CURRENT_SCOPE (b))
2209 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2210 locate_old_decl (b->decl, error);
2212 /* Just use the previous declaration. */
2216 label = make_label (name, input_location);
2217 C_DECLARED_LABEL_FLAG (label) = 1;
2219 /* Declared labels go in the current scope. */
2220 bind (name, label, current_scope,
2221 /*invisible=*/false, /*nested=*/false);
2225 /* Define a label, specifying the location in the source file.
2226 Return the LABEL_DECL node for the label, if the definition is valid.
2227 Otherwise return 0. */
2230 define_label (location_t location, tree name)
2232 /* Find any preexisting label with this name. It is an error
2233 if that label has already been defined in this function, or
2234 if there is a containing function with a declared label with
2236 tree label = I_LABEL_DECL (name);
2239 && ((DECL_CONTEXT (label) == current_function_decl
2240 && DECL_INITIAL (label) != 0)
2241 || (DECL_CONTEXT (label) != current_function_decl
2242 && C_DECLARED_LABEL_FLAG (label))))
2244 error ("%Hduplicate label `%D'", &location, label);
2245 locate_old_decl (label, error);
2248 else if (label && DECL_CONTEXT (label) == current_function_decl)
2250 /* The label has been used or declared already in this function,
2251 but not defined. Update its location to point to this
2253 DECL_SOURCE_LOCATION (label) = location;
2257 /* No label binding for that identifier; make one. */
2258 label = make_label (name, location);
2260 /* Ordinary labels go in the current function scope. */
2261 bind (name, label, current_function_scope,
2262 /*invisible=*/false, /*nested=*/false);
2265 if (warn_traditional && !in_system_header && lookup_name (name))
2266 warning ("%Htraditional C lacks a separate namespace for labels, "
2267 "identifier `%s' conflicts", &location,
2268 IDENTIFIER_POINTER (name));
2270 /* Mark label as having been defined. */
2271 DECL_INITIAL (label) = error_mark_node;
2275 /* Given NAME, an IDENTIFIER_NODE,
2276 return the structure (or union or enum) definition for that name.
2277 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2278 CODE says which kind of type the caller wants;
2279 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2280 If the wrong kind of type is found, an error is reported. */
2283 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2285 struct c_binding *b = I_TAG_BINDING (name);
2291 /* We only care about whether it's in this level if
2292 thislevel_only was set or it might be a type clash. */
2293 if (thislevel_only || TREE_CODE (b->decl) != code)
2295 /* For our purposes, a tag in the external scope is the same as
2296 a tag in the file scope. (Primarily relevant to Objective-C
2297 and its builtin structure tags, which get pushed before the
2298 file scope is created.) */
2299 if (B_IN_CURRENT_SCOPE (b)
2300 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2304 if (thislevel_only && !thislevel)
2307 if (TREE_CODE (b->decl) != code)
2309 /* Definition isn't the kind we were looking for. */
2310 pending_invalid_xref = name;
2311 pending_invalid_xref_location = input_location;
2313 /* If in the same binding level as a declaration as a tag
2314 of a different type, this must not be allowed to
2315 shadow that tag, so give the error immediately.
2316 (For example, "struct foo; union foo;" is invalid.) */
2318 pending_xref_error ();
2323 /* Print an error message now
2324 for a recent invalid struct, union or enum cross reference.
2325 We don't print them immediately because they are not invalid
2326 when used in the `struct foo;' construct for shadowing. */
2329 pending_xref_error (void)
2331 if (pending_invalid_xref != 0)
2332 error ("%H`%s' defined as wrong kind of tag",
2333 &pending_invalid_xref_location,
2334 IDENTIFIER_POINTER (pending_invalid_xref));
2335 pending_invalid_xref = 0;
2339 /* Look up NAME in the current scope and its superiors
2340 in the namespace of variables, functions and typedefs.
2341 Return a ..._DECL node of some kind representing its definition,
2342 or return 0 if it is undefined. */
2345 lookup_name (tree name)
2347 struct c_binding *b = I_SYMBOL_BINDING (name);
2348 if (b && !b->invisible)
2353 /* Similar to `lookup_name' but look only at the indicated scope. */
2356 lookup_name_in_scope (tree name, struct c_scope *scope)
2358 struct c_binding *b;
2360 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2361 if (B_IN_SCOPE (b, scope))
2366 /* Create the predefined scalar types of C,
2367 and some nodes representing standard constants (0, 1, (void *) 0).
2368 Initialize the global scope.
2369 Make definitions for built-in primitive functions. */
2372 c_init_decl_processing (void)
2375 tree ptr_ftype_void, ptr_ftype_ptr;
2376 location_t save_loc = input_location;
2378 /* Adds some ggc roots, and reserved words for c-parse.in. */
2381 current_function_decl = 0;
2383 /* Make the externals scope. */
2385 external_scope = current_scope;
2387 /* Declarations from c_common_nodes_and_builtins must not be associated
2388 with this input file, lest we get differences between using and not
2389 using preprocessed headers. */
2390 #ifdef USE_MAPPED_LOCATION
2391 input_location = BUILTINS_LOCATION;
2393 input_location.file = "<built-in>";
2394 input_location.line = 0;
2397 build_common_tree_nodes (flag_signed_char);
2399 c_common_nodes_and_builtins ();
2401 /* In C, comparisons and TRUTH_* expressions have type int. */
2402 truthvalue_type_node = integer_type_node;
2403 truthvalue_true_node = integer_one_node;
2404 truthvalue_false_node = integer_zero_node;
2406 /* Even in C99, which has a real boolean type. */
2407 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2408 boolean_type_node));
2410 endlink = void_list_node;
2411 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2413 = build_function_type (ptr_type_node,
2414 tree_cons (NULL_TREE, ptr_type_node, endlink));
2416 input_location = save_loc;
2418 pedantic_lvalues = true;
2420 make_fname_decl = c_make_fname_decl;
2421 start_fname_decls ();
2424 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2425 decl, NAME is the initialization string and TYPE_DEP indicates whether
2426 NAME depended on the type of the function. As we don't yet implement
2427 delayed emission of static data, we mark the decl as emitted
2428 so it is not placed in the output. Anything using it must therefore pull
2429 out the STRING_CST initializer directly. FIXME. */
2432 c_make_fname_decl (tree id, int type_dep)
2434 const char *name = fname_as_string (type_dep);
2435 tree decl, type, init;
2436 size_t length = strlen (name);
2438 type = build_array_type
2439 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2440 build_index_type (size_int (length)));
2442 decl = build_decl (VAR_DECL, id, type);
2444 TREE_STATIC (decl) = 1;
2445 TREE_READONLY (decl) = 1;
2446 DECL_ARTIFICIAL (decl) = 1;
2448 init = build_string (length + 1, name);
2449 free ((char *) name);
2450 TREE_TYPE (init) = type;
2451 DECL_INITIAL (decl) = init;
2453 TREE_USED (decl) = 1;
2455 if (current_function_decl)
2457 DECL_CONTEXT (decl) = current_function_decl;
2458 bind (id, decl, current_function_scope,
2459 /*invisible=*/false, /*nested=*/false);
2462 finish_decl (decl, init, NULL_TREE);
2467 /* Return a definition for a builtin function named NAME and whose data type
2468 is TYPE. TYPE should be a function type with argument types.
2469 FUNCTION_CODE tells later passes how to compile calls to this function.
2470 See tree.h for its possible values.
2472 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2473 the name to be called if we can't opencode the function. If
2474 ATTRS is nonzero, use that for the function's attribute list. */
2477 builtin_function (const char *name, tree type, int function_code,
2478 enum built_in_class cl, const char *library_name,
2481 tree id = get_identifier (name);
2482 tree decl = build_decl (FUNCTION_DECL, id, type);
2483 TREE_PUBLIC (decl) = 1;
2484 DECL_EXTERNAL (decl) = 1;
2485 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2486 DECL_BUILT_IN_CLASS (decl) = cl;
2487 DECL_FUNCTION_CODE (decl) = function_code;
2489 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2491 /* Should never be called on a symbol with a preexisting meaning. */
2492 if (I_SYMBOL_BINDING (id))
2495 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2497 /* Builtins in the implementation namespace are made visible without
2498 needing to be explicitly declared. See push_file_scope. */
2499 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2501 TREE_CHAIN (decl) = visible_builtins;
2502 visible_builtins = decl;
2505 /* Possibly apply some default attributes to this built-in function. */
2507 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2509 decl_attributes (&decl, NULL_TREE, 0);
2514 /* Called when a declaration is seen that contains no names to declare.
2515 If its type is a reference to a structure, union or enum inherited
2516 from a containing scope, shadow that tag name for the current scope
2517 with a forward reference.
2518 If its type defines a new named structure or union
2519 or defines an enum, it is valid but we need not do anything here.
2520 Otherwise, it is an error. */
2523 shadow_tag (tree declspecs)
2525 shadow_tag_warned (declspecs, 0);
2529 shadow_tag_warned (tree declspecs, int warned)
2532 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2539 pending_invalid_xref = 0;
2541 /* Remove the attributes from declspecs, since they will confuse the
2543 split_specs_attrs (declspecs, &specs, &attrs);
2545 for (link = specs; link; link = TREE_CHAIN (link))
2547 tree value = TREE_VALUE (link);
2548 enum tree_code code = TREE_CODE (value);
2550 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2551 /* Used to test also that TYPE_SIZE (value) != 0.
2552 That caused warning for `struct foo;' at top level in the file. */
2554 tree name = TYPE_NAME (value);
2561 if (warned != 1 && code != ENUMERAL_TYPE)
2562 /* Empty unnamed enum OK */
2564 pedwarn ("unnamed struct/union that defines no instances");
2570 t = lookup_tag (code, name, 1);
2574 t = make_node (code);
2581 if (!warned && ! in_system_header)
2583 warning ("useless keyword or type name in empty declaration");
2590 error ("two types specified in one empty declaration");
2595 pedwarn ("empty declaration");
2599 /* Construct an array declarator. EXPR is the expression inside [], or
2600 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2601 to the pointer to which a parameter array is converted). STATIC_P is
2602 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2603 is nonzero is the array is [*], a VLA of unspecified length which is
2604 nevertheless a complete type (not currently implemented by GCC),
2605 zero otherwise. The declarator is constructed as an ARRAY_REF
2606 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2607 left of the [] (filled by in set_array_declarator_type) and operand 1
2608 is the expression inside; whose TREE_TYPE is the type qualifiers and
2609 which has TREE_STATIC set if "static" is used. */
2612 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2615 decl = build_nt (ARRAY_REF, NULL_TREE, expr, NULL_TREE, NULL_TREE);
2616 TREE_TYPE (decl) = quals;
2617 TREE_STATIC (decl) = (static_p ? 1 : 0);
2618 if (pedantic && !flag_isoc99)
2620 if (static_p || quals != NULL_TREE)
2621 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2623 pedwarn ("ISO C90 does not support `[*]' array declarators");
2626 warning ("GCC does not yet properly implement `[*]' array declarators");
2630 /* Set the type of an array declarator. DECL is the declarator, as
2631 constructed by build_array_declarator; TYPE is what appears on the left
2632 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2633 abstract declarator, zero otherwise; this is used to reject static and
2634 type qualifiers in abstract declarators, where they are not in the
2638 set_array_declarator_type (tree decl, tree type, int abstract_p)
2640 TREE_OPERAND (decl, 0) = type;
2641 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2642 error ("static or type qualifiers in abstract declarator");
2646 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2649 groktypename (tree typename)
2653 if (TREE_CODE (typename) != TREE_LIST)
2656 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2658 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0,
2661 /* Apply attributes. */
2662 decl_attributes (&typename, attrs, 0);
2667 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2670 groktypename_in_parm_context (tree typename)
2672 if (TREE_CODE (typename) != TREE_LIST)
2674 return grokdeclarator (TREE_VALUE (typename),
2675 TREE_PURPOSE (typename),
2679 /* Decode a declarator in an ordinary declaration or data definition.
2680 This is called as soon as the type information and variable name
2681 have been parsed, before parsing the initializer if any.
2682 Here we create the ..._DECL node, fill in its type,
2683 and put it on the list of decls for the current context.
2684 The ..._DECL node is returned as the value.
2686 Exception: for arrays where the length is not specified,
2687 the type is left null, to be filled in by `finish_decl'.
2689 Function definitions do not come here; they go to start_function
2690 instead. However, external and forward declarations of functions
2691 do go through here. Structure field declarations are done by
2692 grokfield and not through here. */
2695 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2700 /* An object declared as __attribute__((deprecated)) suppresses
2701 warnings of uses of other deprecated items. */
2702 if (lookup_attribute ("deprecated", attributes))
2703 deprecated_state = DEPRECATED_SUPPRESS;
2705 decl = grokdeclarator (declarator, declspecs,
2706 NORMAL, initialized, NULL);
2708 deprecated_state = DEPRECATED_NORMAL;
2710 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2711 && MAIN_NAME_P (DECL_NAME (decl)))
2712 warning ("%J'%D' is usually a function", decl, decl);
2715 /* Is it valid for this decl to have an initializer at all?
2716 If not, set INITIALIZED to zero, which will indirectly
2717 tell 'finish_decl' to ignore the initializer once it is parsed. */
2718 switch (TREE_CODE (decl))
2721 error ("typedef '%D' is initialized (use __typeof__ instead)", decl);
2726 error ("function '%D' is initialized like a variable", decl);
2731 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2732 error ("parameter '%D' is initialized", decl);
2737 /* Don't allow initializations for incomplete types except for
2738 arrays which might be completed by the initialization. */
2740 /* This can happen if the array size is an undefined macro.
2741 We already gave a warning, so we don't need another one. */
2742 if (TREE_TYPE (decl) == error_mark_node)
2744 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2746 /* A complete type is ok if size is fixed. */
2748 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2749 || C_DECL_VARIABLE_SIZE (decl))
2751 error ("variable-sized object may not be initialized");
2755 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2757 error ("variable '%D' has initializer but incomplete type", decl);
2760 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2762 error ("elements of array '%D' have incomplete type", decl);
2769 if (current_scope == file_scope)
2770 TREE_STATIC (decl) = 1;
2772 /* Tell 'pushdecl' this is an initialized decl
2773 even though we don't yet have the initializer expression.
2774 Also tell 'finish_decl' it may store the real initializer. */
2775 DECL_INITIAL (decl) = error_mark_node;
2778 /* If this is a function declaration, write a record describing it to the
2779 prototypes file (if requested). */
2781 if (TREE_CODE (decl) == FUNCTION_DECL)
2782 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2784 /* ANSI specifies that a tentative definition which is not merged with
2785 a non-tentative definition behaves exactly like a definition with an
2786 initializer equal to zero. (Section 3.7.2)
2788 -fno-common gives strict ANSI behavior, though this tends to break
2789 a large body of code that grew up without this rule.
2791 Thread-local variables are never common, since there's no entrenched
2792 body of code to break, and it allows more efficient variable references
2793 in the presence of dynamic linking. */
2795 if (TREE_CODE (decl) == VAR_DECL
2797 && TREE_PUBLIC (decl)
2798 && !DECL_THREAD_LOCAL (decl)
2800 DECL_COMMON (decl) = 1;
2802 /* Set attributes here so if duplicate decl, will have proper attributes. */
2803 decl_attributes (&decl, attributes, 0);
2805 if (TREE_CODE (decl) == FUNCTION_DECL
2806 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2808 tree ce = declarator;
2810 if (TREE_CODE (ce) == INDIRECT_REF)
2811 ce = TREE_OPERAND (declarator, 0);
2812 if (TREE_CODE (ce) == CALL_EXPR)
2814 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2815 for (; args; args = TREE_CHAIN (args))
2817 tree type = TREE_TYPE (args);
2818 if (type && INTEGRAL_TYPE_P (type)
2819 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2820 DECL_ARG_TYPE (args) = integer_type_node;
2825 if (TREE_CODE (decl) == FUNCTION_DECL
2826 && DECL_DECLARED_INLINE_P (decl)
2827 && DECL_UNINLINABLE (decl)
2828 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2829 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2831 /* Add this decl to the current scope.
2832 TEM may equal DECL or it may be a previous decl of the same name. */
2833 tem = pushdecl (decl);
2836 DECL_EXTERNAL (tem) = 0;
2841 /* Finish processing of a declaration;
2842 install its initial value.
2843 If the length of an array type is not known before,
2844 it must be determined now, from the initial value, or it is an error. */
2847 finish_decl (tree decl, tree init, tree asmspec_tree)
2849 tree type = TREE_TYPE (decl);
2850 int was_incomplete = (DECL_SIZE (decl) == 0);
2851 const char *asmspec = 0;
2853 /* If a name was specified, get the string. */
2854 if (current_scope == file_scope)
2855 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2857 asmspec = TREE_STRING_POINTER (asmspec_tree);
2859 /* If `start_decl' didn't like having an initialization, ignore it now. */
2860 if (init != 0 && DECL_INITIAL (decl) == 0)
2863 /* Don't crash if parm is initialized. */
2864 if (TREE_CODE (decl) == PARM_DECL)
2868 store_init_value (decl, init);
2870 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2871 || TREE_CODE (decl) == FUNCTION_DECL
2872 || TREE_CODE (decl) == FIELD_DECL))
2873 objc_check_decl (decl);
2875 /* Deduce size of array from initialization, if not already known. */
2876 if (TREE_CODE (type) == ARRAY_TYPE
2877 && TYPE_DOMAIN (type) == 0
2878 && TREE_CODE (decl) != TYPE_DECL)
2881 = (TREE_STATIC (decl)
2882 /* Even if pedantic, an external linkage array
2883 may have incomplete type at first. */
2884 ? pedantic && !TREE_PUBLIC (decl)
2885 : !DECL_EXTERNAL (decl));
2887 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2889 /* Get the completed type made by complete_array_type. */
2890 type = TREE_TYPE (decl);
2893 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2895 else if (failure == 2)
2898 error ("%Jarray size missing in '%D'", decl, decl);
2899 /* If a `static' var's size isn't known,
2900 make it extern as well as static, so it does not get
2902 If it is not `static', then do not mark extern;
2903 finish_incomplete_decl will give it a default size
2904 and it will get allocated. */
2905 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2906 DECL_EXTERNAL (decl) = 1;
2909 /* TYPE_MAX_VALUE is always one less than the number of elements
2910 in the array, because we start counting at zero. Therefore,
2911 warn only if the value is less than zero. */
2912 else if (pedantic && TYPE_DOMAIN (type) != 0
2913 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2914 error ("%Jzero or negative size array '%D'", decl, decl);
2916 layout_decl (decl, 0);
2919 if (TREE_CODE (decl) == VAR_DECL)
2921 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2922 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2923 layout_decl (decl, 0);
2925 if (DECL_SIZE (decl) == 0
2926 /* Don't give an error if we already gave one earlier. */
2927 && TREE_TYPE (decl) != error_mark_node
2928 && (TREE_STATIC (decl)
2930 /* A static variable with an incomplete type
2931 is an error if it is initialized.
2932 Also if it is not file scope.
2933 Otherwise, let it through, but if it is not `extern'
2934 then it may cause an error message later. */
2935 (DECL_INITIAL (decl) != 0
2936 || !DECL_FILE_SCOPE_P (decl))
2938 /* An automatic variable with an incomplete type
2940 !DECL_EXTERNAL (decl)))
2942 error ("%Jstorage size of '%D' isn't known", decl, decl);
2943 TREE_TYPE (decl) = error_mark_node;
2946 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2947 && DECL_SIZE (decl) != 0)
2949 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2950 constant_expression_warning (DECL_SIZE (decl));
2952 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2955 if (TREE_USED (type))
2956 TREE_USED (decl) = 1;
2959 /* If this is a function and an assembler name is specified, reset DECL_RTL
2960 so we can give it its new name. Also, update built_in_decls if it
2961 was a normal built-in. */
2962 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2964 /* ASMSPEC is given, and not the name of a register. Mark the
2965 name with a star so assemble_name won't munge it. */
2966 char *starred = alloca (strlen (asmspec) + 2);
2968 strcpy (starred + 1, asmspec);
2970 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2972 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2973 SET_DECL_RTL (builtin, NULL_RTX);
2974 change_decl_assembler_name (builtin, get_identifier (starred));
2975 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2976 init_block_move_fn (starred);
2977 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2978 init_block_clear_fn (starred);
2980 SET_DECL_RTL (decl, NULL_RTX);
2981 change_decl_assembler_name (decl, get_identifier (starred));
2984 /* If #pragma weak was used, mark the decl weak now. */
2985 if (current_scope == file_scope)
2986 maybe_apply_pragma_weak (decl);
2988 /* Output the assembler code and/or RTL code for variables and functions,
2989 unless the type is an undefined structure or union.
2990 If not, it will get done when the type is completed. */
2992 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2994 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2995 if (c_dialect_objc ())
2996 objc_check_decl (decl);
2998 if (DECL_FILE_SCOPE_P (decl))
3000 if (DECL_INITIAL (decl) == NULL_TREE
3001 || DECL_INITIAL (decl) == error_mark_node)
3002 /* Don't output anything
3003 when a tentative file-scope definition is seen.
3004 But at end of compilation, do output code for them. */
3005 DECL_DEFER_OUTPUT (decl) = 1;
3006 rest_of_decl_compilation (decl, asmspec, true, 0);
3010 /* This is a local variable. If there is an ASMSPEC, the
3011 user has requested that we handle it specially. */
3014 /* In conjunction with an ASMSPEC, the `register'
3015 keyword indicates that we should place the variable
3016 in a particular register. */
3017 if (C_DECL_REGISTER (decl))
3019 DECL_HARD_REGISTER (decl) = 1;
3020 /* This cannot be done for a structure with volatile
3021 fields, on which DECL_REGISTER will have been
3023 if (!DECL_REGISTER (decl))
3024 error ("cannot put object with volatile field into register");
3027 /* If this is not a static variable, issue a warning.
3028 It doesn't make any sense to give an ASMSPEC for an
3029 ordinary, non-register local variable. Historically,
3030 GCC has accepted -- but ignored -- the ASMSPEC in
3032 if (TREE_CODE (decl) == VAR_DECL
3033 && !C_DECL_REGISTER (decl)
3034 && !TREE_STATIC (decl))
3035 warning ("%Jignoring asm-specifier for non-static local "
3036 "variable '%D'", decl, decl);
3038 change_decl_assembler_name (decl, get_identifier (asmspec));
3041 if (TREE_CODE (decl) != FUNCTION_DECL)
3042 add_stmt (build_stmt (DECL_EXPR, decl));
3045 if (!DECL_FILE_SCOPE_P (decl))
3047 /* Recompute the RTL of a local array now
3048 if it used to be an incomplete type. */
3050 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3052 /* If we used it already as memory, it must stay in memory. */
3053 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3054 /* If it's still incomplete now, no init will save it. */
3055 if (DECL_SIZE (decl) == 0)
3056 DECL_INITIAL (decl) = 0;
3061 /* If this was marked 'used', be sure it will be output. */
3062 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3063 mark_decl_referenced (decl);
3065 if (TREE_CODE (decl) == TYPE_DECL)
3067 if (!DECL_FILE_SCOPE_P (decl)
3068 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3069 add_stmt (build_stmt (DECL_EXPR, decl));
3071 rest_of_decl_compilation (decl, NULL, DECL_FILE_SCOPE_P (decl), 0);
3074 /* At the end of a declaration, throw away any variable type sizes
3075 of types defined inside that declaration. There is no use
3076 computing them in the following function definition. */
3077 if (current_scope == file_scope)
3078 get_pending_sizes ();
3080 /* Install a cleanup (aka destructor) if one was given. */
3081 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3083 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3086 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3087 tree cleanup_decl = lookup_name (cleanup_id);
3090 /* Build "cleanup(&decl)" for the destructor. */
3091 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3092 cleanup = build_tree_list (NULL_TREE, cleanup);
3093 cleanup = build_function_call (cleanup_decl, cleanup);
3095 /* Don't warn about decl unused; the cleanup uses it. */
3096 TREE_USED (decl) = 1;
3097 TREE_USED (cleanup_decl) = 1;
3099 /* Initialize EH, if we've been told to do so. */
3100 if (flag_exceptions && !c_eh_initialized_p)
3102 c_eh_initialized_p = true;
3103 eh_personality_libfunc
3104 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3105 ? "__gcc_personality_sj0"
3106 : "__gcc_personality_v0");
3107 using_eh_for_cleanups ();
3110 push_cleanup (decl, cleanup, false);
3115 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3116 and push that on the current scope. */
3119 push_parm_decl (tree parm)
3123 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3124 TREE_PURPOSE (TREE_PURPOSE (parm)),
3126 decl_attributes (&decl, TREE_VALUE (parm), 0);
3128 decl = pushdecl (decl);
3130 finish_decl (decl, NULL_TREE, NULL_TREE);
3133 /* Mark all the parameter declarations to date as forward decls.
3134 Also diagnose use of this extension. */
3137 mark_forward_parm_decls (void)
3139 struct c_binding *b;
3141 if (pedantic && !current_scope->warned_forward_parm_decls)
3143 pedwarn ("ISO C forbids forward parameter declarations");
3144 current_scope->warned_forward_parm_decls = true;
3147 for (b = current_scope->bindings; b; b = b->prev)
3148 if (TREE_CODE (b->decl) == PARM_DECL)
3149 TREE_ASM_WRITTEN (b->decl) = 1;
3152 static GTY(()) int compound_literal_number;
3154 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3155 literal, which may be an incomplete array type completed by the
3156 initializer; INIT is a CONSTRUCTOR that initializes the compound
3160 build_compound_literal (tree type, tree init)
3162 /* We do not use start_decl here because we have a type, not a declarator;
3163 and do not use finish_decl because the decl should be stored inside
3164 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3165 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3168 DECL_EXTERNAL (decl) = 0;
3169 TREE_PUBLIC (decl) = 0;
3170 TREE_STATIC (decl) = (current_scope == file_scope);
3171 DECL_CONTEXT (decl) = current_function_decl;
3172 TREE_USED (decl) = 1;
3173 TREE_TYPE (decl) = type;
3174 TREE_READONLY (decl) = TYPE_READONLY (type);
3175 store_init_value (decl, init);
3177 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3179 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3184 type = TREE_TYPE (decl);
3185 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3186 return error_mark_node;
3188 stmt = build_stmt (DECL_EXPR, decl);
3189 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3190 TREE_SIDE_EFFECTS (complit) = 1;
3192 layout_decl (decl, 0);
3194 if (TREE_STATIC (decl))
3196 /* This decl needs a name for the assembler output. We also need
3197 a unique suffix to be added to the name. */
3200 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3201 compound_literal_number);
3202 compound_literal_number++;
3203 DECL_NAME (decl) = get_identifier (name);
3204 DECL_DEFER_OUTPUT (decl) = 1;
3205 DECL_COMDAT (decl) = 1;
3206 DECL_ARTIFICIAL (decl) = 1;
3208 rest_of_decl_compilation (decl, NULL, 1, 0);
3214 /* Make TYPE a complete type based on INITIAL_VALUE.
3215 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3216 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3219 complete_array_type (tree type, tree initial_value, int do_default)
3221 tree maxindex = NULL_TREE;
3226 /* Note MAXINDEX is really the maximum index,
3227 one less than the size. */
3228 if (TREE_CODE (initial_value) == STRING_CST)
3231 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3232 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3235 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3237 tree elts = CONSTRUCTOR_ELTS (initial_value);
3238 maxindex = build_int_2 (-1, -1);
3239 for (; elts; elts = TREE_CHAIN (elts))
3241 if (TREE_PURPOSE (elts))
3242 maxindex = TREE_PURPOSE (elts);
3244 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3245 maxindex, integer_one_node));
3247 maxindex = copy_node (maxindex);
3251 /* Make an error message unless that happened already. */
3252 if (initial_value != error_mark_node)
3255 /* Prevent further error messages. */
3256 maxindex = build_int_2 (0, 0);
3263 maxindex = build_int_2 (0, 0);
3269 TYPE_DOMAIN (type) = build_index_type (maxindex);
3270 if (!TREE_TYPE (maxindex))
3271 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3274 /* Lay out the type now that we can get the real answer. */
3281 /* Determine whether TYPE is a structure with a flexible array member,
3282 or a union containing such a structure (possibly recursively). */
3285 flexible_array_type_p (tree type)
3288 switch (TREE_CODE (type))
3291 x = TYPE_FIELDS (type);
3294 while (TREE_CHAIN (x) != NULL_TREE)
3296 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3297 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3298 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3299 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3303 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3305 if (flexible_array_type_p (TREE_TYPE (x)))
3314 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3315 replacing with appropriate values if they are invalid. */
3317 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3320 unsigned int max_width;
3321 unsigned HOST_WIDE_INT w;
3322 const char *name = orig_name ? orig_name: _("<anonymous>");
3325 STRIP_NOPS (*width);
3327 /* Detect and ignore out of range field width and process valid
3329 if (TREE_CODE (*width) != INTEGER_CST)
3331 error ("bit-field `%s' width not an integer constant", name);
3332 *width = integer_one_node;
3336 constant_expression_warning (*width);
3337 if (tree_int_cst_sgn (*width) < 0)
3339 error ("negative width in bit-field `%s'", name);
3340 *width = integer_one_node;
3342 else if (integer_zerop (*width) && orig_name)
3344 error ("zero width for bit-field `%s'", name);
3345 *width = integer_one_node;
3349 /* Detect invalid bit-field type. */
3350 if (TREE_CODE (*type) != INTEGER_TYPE
3351 && TREE_CODE (*type) != BOOLEAN_TYPE
3352 && TREE_CODE (*type) != ENUMERAL_TYPE)
3354 error ("bit-field `%s' has invalid type", name);
3355 *type = unsigned_type_node;
3358 type_mv = TYPE_MAIN_VARIANT (*type);
3360 && type_mv != integer_type_node
3361 && type_mv != unsigned_type_node
3362 && type_mv != boolean_type_node)
3363 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3365 if (type_mv == boolean_type_node)
3366 max_width = CHAR_TYPE_SIZE;
3368 max_width = TYPE_PRECISION (*type);
3370 if (0 < compare_tree_int (*width, max_width))
3372 error ("width of `%s' exceeds its type", name);
3374 *width = build_int_2 (w, 0);
3377 w = tree_low_cst (*width, 1);
3379 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3381 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3383 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3384 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3385 warning ("`%s' is narrower than values of its type", name);
3389 /* Given declspecs and a declarator,
3390 determine the name and type of the object declared
3391 and construct a ..._DECL node for it.
3392 (In one case we can return a ..._TYPE node instead.
3393 For invalid input we sometimes return 0.)
3395 DECLSPECS is a chain of tree_list nodes whose value fields
3396 are the storage classes and type specifiers.
3398 DECL_CONTEXT says which syntactic context this declaration is in:
3399 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3400 FUNCDEF for a function definition. Like NORMAL but a few different
3401 error messages in each case. Return value may be zero meaning
3402 this definition is too screwy to try to parse.
3403 PARM for a parameter declaration (either within a function prototype
3404 or before a function body). Make a PARM_DECL, or return void_type_node.
3405 TYPENAME if for a typename (in a cast or sizeof).
3406 Don't make a DECL node; just return the ..._TYPE node.
3407 FIELD for a struct or union field; make a FIELD_DECL.
3408 INITIALIZED is 1 if the decl has an initializer.
3409 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3410 representing the width of the bit-field.
3412 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3413 It may also be so in the PARM case, for a prototype where the
3414 argument type is specified but not the name.
3416 This function is where the complicated C meanings of `static'
3417 and `extern' are interpreted. */
3420 grokdeclarator (tree declarator, tree declspecs,
3421 enum decl_context decl_context, int initialized, tree *width)
3425 tree type = NULL_TREE;
3430 int type_quals = TYPE_UNQUALIFIED;
3432 int explicit_int = 0;
3433 int explicit_char = 0;
3434 int defaulted_int = 0;
3435 tree typedef_decl = 0;
3436 const char *name, *orig_name;
3437 tree typedef_type = 0;
3438 int funcdef_flag = 0;
3439 enum tree_code innermost_code = ERROR_MARK;
3440 int size_varies = 0;
3441 tree decl_attr = NULL_TREE;
3442 tree array_ptr_quals = NULL_TREE;
3443 int array_parm_static = 0;
3444 tree returned_attrs = NULL_TREE;
3445 bool bitfield = width != NULL;
3447 tree arg_info = NULL_TREE;
3449 if (decl_context == FUNCDEF)
3450 funcdef_flag = 1, decl_context = NORMAL;
3452 /* Look inside a declarator for the name being declared
3453 and get it as a string, for an error message. */
3455 tree decl = declarator;
3459 switch (TREE_CODE (decl))
3464 innermost_code = TREE_CODE (decl);
3465 decl = TREE_OPERAND (decl, 0);
3469 decl = TREE_VALUE (decl);
3472 case IDENTIFIER_NODE:
3473 name = IDENTIFIER_POINTER (decl);
3485 /* A function definition's declarator must have the form of
3486 a function declarator. */
3488 if (funcdef_flag && innermost_code != CALL_EXPR)
3491 /* If this looks like a function definition, make it one,
3492 even if it occurs where parms are expected.
3493 Then store_parm_decls will reject it and not use it as a parm. */
3494 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3495 decl_context = PARM;
3497 /* Look through the decl specs and record which ones appear.
3498 Some typespecs are defined as built-in typenames.
3499 Others, the ones that are modifiers of other types,
3500 are represented by bits in SPECBITS: set the bits for
3501 the modifiers that appear. Storage class keywords are also in SPECBITS.
3503 If there is a typedef name or a type, store the type in TYPE.
3504 This includes builtin typedefs such as `int'.
3506 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3507 and did not come from a user typedef.
3509 Set LONGLONG if `long' is mentioned twice. */
3511 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3513 tree id = TREE_VALUE (spec);
3515 /* If the entire declaration is itself tagged as deprecated then
3516 suppress reports of deprecated items. */
3517 if (id && TREE_DEPRECATED (id))
3519 if (deprecated_state != DEPRECATED_SUPPRESS)
3520 warn_deprecated_use (id);
3523 if (id == ridpointers[(int) RID_INT])
3525 if (id == ridpointers[(int) RID_CHAR])
3528 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3530 enum rid i = C_RID_CODE (id);
3531 if ((int) i <= (int) RID_LAST_MODIFIER)
3533 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3536 error ("`long long long' is too long for GCC");
3539 if (pedantic && !flag_isoc99 && ! in_system_header
3541 pedwarn ("ISO C90 does not support `long long'");
3545 else if (specbits & (1 << (int) i))
3547 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3549 if (pedantic && !flag_isoc99)
3550 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3553 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3556 /* Diagnose "__thread extern". Recall that this list
3557 is in the reverse order seen in the text. */
3559 && (specbits & (1 << (int) RID_EXTERN
3560 | 1 << (int) RID_STATIC)))
3562 if (specbits & 1 << (int) RID_EXTERN)
3563 error ("`__thread' before `extern'");
3565 error ("`__thread' before `static'");
3568 specbits |= 1 << (int) i;
3573 error ("two or more data types in declaration of `%s'", name);
3574 /* Actual typedefs come to us as TYPE_DECL nodes. */
3575 else if (TREE_CODE (id) == TYPE_DECL)
3577 if (TREE_TYPE (id) == error_mark_node)
3578 ; /* Allow the type to default to int to avoid cascading errors. */
3581 type = TREE_TYPE (id);
3582 decl_attr = DECL_ATTRIBUTES (id);
3586 /* Built-in types come as identifiers. */
3587 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3589 tree t = lookup_name (id);
3590 if (!t || TREE_CODE (t) != TYPE_DECL)
3591 error ("`%s' fails to be a typedef or built in type",
3592 IDENTIFIER_POINTER (id));
3593 else if (TREE_TYPE (t) == error_mark_node)
3597 type = TREE_TYPE (t);
3601 else if (TREE_CODE (id) != ERROR_MARK)
3608 typedef_type = type;
3610 size_varies = C_TYPE_VARIABLE_SIZE (type);
3612 /* No type at all: default to `int', and set DEFAULTED_INT
3613 because it was not a user-defined typedef. */
3617 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3618 | (1 << (int) RID_SIGNED)
3619 | (1 << (int) RID_UNSIGNED)
3620 | (1 << (int) RID_COMPLEX))))
3621 /* Don't warn about typedef foo = bar. */
3622 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3623 && ! in_system_header)
3625 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3626 and this is a function, or if -Wimplicit; prefer the former
3627 warning since it is more explicit. */
3628 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3630 warn_about_return_type = 1;
3631 else if (warn_implicit_int || flag_isoc99)
3632 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3637 type = integer_type_node;
3640 /* Now process the modifiers that were specified
3641 and check for invalid combinations. */
3643 /* Long double is a special combination. */
3645 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3646 && TYPE_MAIN_VARIANT (type) == double_type_node)
3648 specbits &= ~(1 << (int) RID_LONG);
3649 type = long_double_type_node;
3652 /* Check all other uses of type modifiers. */
3654 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3655 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3659 if ((specbits & 1 << (int) RID_LONG)
3660 && (specbits & 1 << (int) RID_SHORT))
3661 error ("both long and short specified for `%s'", name);
3662 else if (((specbits & 1 << (int) RID_LONG)
3663 || (specbits & 1 << (int) RID_SHORT))
3665 error ("long or short specified with char for `%s'", name);
3666 else if (((specbits & 1 << (int) RID_LONG)
3667 || (specbits & 1 << (int) RID_SHORT))
3668 && TREE_CODE (type) == REAL_TYPE)
3670 static int already = 0;
3672 error ("long or short specified with floating type for `%s'", name);
3673 if (! already && ! pedantic)
3675 error ("the only valid combination is `long double'");
3679 else if ((specbits & 1 << (int) RID_SIGNED)
3680 && (specbits & 1 << (int) RID_UNSIGNED))
3681 error ("both signed and unsigned specified for `%s'", name);
3682 else if (TREE_CODE (type) != INTEGER_TYPE)
3683 error ("long, short, signed or unsigned invalid for `%s'", name);
3687 if (!explicit_int && !defaulted_int && !explicit_char)
3689 error ("long, short, signed or unsigned used invalidly for `%s'",
3695 /* Discard the type modifiers if they are invalid. */
3698 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3699 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3704 if ((specbits & (1 << (int) RID_COMPLEX))
3705 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3707 error ("complex invalid for `%s'", name);
3708 specbits &= ~(1 << (int) RID_COMPLEX);
3711 /* Decide whether an integer type is signed or not.
3712 Optionally treat bit-fields as signed by default. */
3713 if (specbits & 1 << (int) RID_UNSIGNED
3714 || (bitfield && ! flag_signed_bitfields
3715 && (explicit_int || defaulted_int || explicit_char
3716 /* A typedef for plain `int' without `signed'
3717 can be controlled just like plain `int'. */
3718 || ! (typedef_decl != 0
3719 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3720 && TREE_CODE (type) != ENUMERAL_TYPE
3721 && !(specbits & 1 << (int) RID_SIGNED)))
3724 type = long_long_unsigned_type_node;
3725 else if (specbits & 1 << (int) RID_LONG)
3726 type = long_unsigned_type_node;
3727 else if (specbits & 1 << (int) RID_SHORT)
3728 type = short_unsigned_type_node;
3729 else if (type == char_type_node)
3730 type = unsigned_char_type_node;
3731 else if (typedef_decl)
3732 type = c_common_unsigned_type (type);
3734 type = unsigned_type_node;
3736 else if ((specbits & 1 << (int) RID_SIGNED)
3737 && type == char_type_node)
3738 type = signed_char_type_node;
3740 type = long_long_integer_type_node;
3741 else if (specbits & 1 << (int) RID_LONG)
3742 type = long_integer_type_node;
3743 else if (specbits & 1 << (int) RID_SHORT)
3744 type = short_integer_type_node;
3746 if (specbits & 1 << (int) RID_COMPLEX)
3748 if (pedantic && !flag_isoc99)
3749 pedwarn ("ISO C90 does not support complex types");
3750 /* If we just have "complex", it is equivalent to
3751 "complex double", but if any modifiers at all are specified it is
3752 the complex form of TYPE. E.g, "complex short" is
3753 "complex short int". */
3755 if (defaulted_int && ! longlong
3756 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3757 | (1 << (int) RID_SIGNED)
3758 | (1 << (int) RID_UNSIGNED))))
3761 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3762 type = complex_double_type_node;
3764 else if (type == integer_type_node)
3767 pedwarn ("ISO C does not support complex integer types");
3768 type = complex_integer_type_node;
3770 else if (type == float_type_node)
3771 type = complex_float_type_node;
3772 else if (type == double_type_node)
3773 type = complex_double_type_node;
3774 else if (type == long_double_type_node)
3775 type = complex_long_double_type_node;
3779 pedwarn ("ISO C does not support complex integer types");
3780 type = build_complex_type (type);
3784 /* Check the type and width of a bit-field. */
3786 check_bitfield_type_and_width (&type, width, orig_name);
3788 /* Figure out the type qualifiers for the declaration. There are
3789 two ways a declaration can become qualified. One is something
3790 like `const int i' where the `const' is explicit. Another is
3791 something like `typedef const int CI; CI i' where the type of the
3792 declaration contains the `const'. A third possibility is that
3793 there is a type qualifier on the element type of a typedefed
3794 array type, in which case we should extract that qualifier so
3795 that c_apply_type_quals_to_decls receives the full list of
3796 qualifiers to work with (C90 is not entirely clear about whether
3797 duplicate qualifiers should be diagnosed in this case, but it
3798 seems most appropriate to do so). */
3799 element_type = strip_array_types (type);
3800 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3802 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3804 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3805 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3806 if (pedantic && !flag_isoc99)
3809 pedwarn ("duplicate `const'");
3811 pedwarn ("duplicate `restrict'");
3813 pedwarn ("duplicate `volatile'");
3815 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3816 type = TYPE_MAIN_VARIANT (type);
3817 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3818 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3819 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3821 /* Warn if two storage classes are given. Default to `auto'. */
3826 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3827 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3828 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3829 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3830 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3832 /* "static __thread" and "extern __thread" are allowed. */
3833 if ((specbits & (1 << (int) RID_THREAD
3834 | 1 << (int) RID_STATIC
3835 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3838 /* Warn about storage classes that are invalid for certain
3839 kinds of declarations (parameters, typenames, etc.). */
3842 error ("multiple storage classes in declaration of `%s'", name);
3843 else if (funcdef_flag
3845 & ((1 << (int) RID_REGISTER)
3846 | (1 << (int) RID_AUTO)
3847 | (1 << (int) RID_TYPEDEF)
3848 | (1 << (int) RID_THREAD))))
3850 if (specbits & 1 << (int) RID_AUTO
3851 && (pedantic || current_scope == file_scope))
3852 pedwarn ("function definition declared `auto'");
3853 if (specbits & 1 << (int) RID_REGISTER)
3854 error ("function definition declared `register'");
3855 if (specbits & 1 << (int) RID_TYPEDEF)
3856 error ("function definition declared `typedef'");
3857 if (specbits & 1 << (int) RID_THREAD)
3858 error ("function definition declared `__thread'");
3859 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3860 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3862 else if (decl_context != NORMAL && nclasses > 0)
3864 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3868 switch (decl_context)
3871 error ("storage class specified for structure field `%s'",
3875 error ("storage class specified for parameter `%s'", name);
3878 error ("storage class specified for typename");
3881 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3882 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3883 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3886 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3888 /* `extern' with initialization is invalid if not at file scope. */
3889 if (current_scope == file_scope)
3890 warning ("`%s' initialized and declared `extern'", name);
3892 error ("`%s' has both `extern' and initializer", name);
3894 else if (current_scope == file_scope)
3896 if (specbits & 1 << (int) RID_AUTO)
3897 error ("file-scope declaration of `%s' specifies `auto'", name);
3901 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3902 error ("nested function `%s' declared `extern'", name);
3903 else if ((specbits & (1 << (int) RID_THREAD
3904 | 1 << (int) RID_EXTERN
3905 | 1 << (int) RID_STATIC))
3906 == (1 << (int) RID_THREAD))
3908 error ("function-scope `%s' implicitly auto and declared `__thread'",
3910 specbits &= ~(1 << (int) RID_THREAD);
3915 /* Now figure out the structure of the declarator proper.
3916 Descend through it, creating more complex types, until we reach
3917 the declared identifier (or NULL_TREE, in an absolute declarator). */
3919 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3921 if (type == error_mark_node)
3923 declarator = TREE_OPERAND (declarator, 0);
3927 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3928 an INDIRECT_REF (for *...),
3929 a CALL_EXPR (for ...(...)),
3930 a TREE_LIST (for nested attributes),
3931 an identifier (for the name being declared)
3932 or a null pointer (for the place in an absolute declarator
3933 where the name was omitted).
3934 For the last two cases, we have just exited the loop.
3936 At this point, TYPE is the type of elements of an array,
3937 or for a function to return, or for a pointer to point to.
3938 After this sequence of ifs, TYPE is the type of the
3939 array or function or pointer, and DECLARATOR has had its
3940 outermost layer removed. */
3942 if (array_ptr_quals != NULL_TREE || array_parm_static)
3944 /* Only the innermost declarator (making a parameter be of
3945 array type which is converted to pointer type)
3946 may have static or type qualifiers. */
3947 error ("static or type qualifiers in non-parameter array declarator");
3948 array_ptr_quals = NULL_TREE;
3949 array_parm_static = 0;
3952 if (TREE_CODE (declarator) == TREE_LIST)
3954 /* We encode a declarator with embedded attributes using
3956 tree attrs = TREE_PURPOSE (declarator);
3959 declarator = TREE_VALUE (declarator);
3960 inner_decl = declarator;
3961 while (inner_decl != NULL_TREE
3962 && TREE_CODE (inner_decl) == TREE_LIST)
3963 inner_decl = TREE_VALUE (inner_decl);
3964 if (inner_decl == NULL_TREE
3965 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3966 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3967 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3968 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3969 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3970 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3971 returned_attrs = decl_attributes (&type,
3972 chainon (returned_attrs, attrs),
3975 else if (TREE_CODE (declarator) == ARRAY_REF)
3977 tree itype = NULL_TREE;
3978 tree size = TREE_OPERAND (declarator, 1);
3979 /* The index is a signed object `sizetype' bits wide. */
3980 tree index_type = c_common_signed_type (sizetype);
3982 array_ptr_quals = TREE_TYPE (declarator);
3983 array_parm_static = TREE_STATIC (declarator);
3985 declarator = TREE_OPERAND (declarator, 0);
3987 /* Check for some types that there cannot be arrays of. */
3989 if (VOID_TYPE_P (type))
3991 error ("declaration of `%s' as array of voids", name);
3992 type = error_mark_node;
3995 if (TREE_CODE (type) == FUNCTION_TYPE)
3997 error ("declaration of `%s' as array of functions", name);
3998 type = error_mark_node;
4001 if (pedantic && !in_system_header && flexible_array_type_p (type))
4002 pedwarn ("invalid use of structure with flexible array member");
4004 if (size == error_mark_node)
4005 type = error_mark_node;
4007 if (type == error_mark_node)
4010 /* If size was specified, set ITYPE to a range-type for that size.
4011 Otherwise, ITYPE remains null. finish_decl may figure it out
4012 from an initial value. */
4016 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4017 STRIP_TYPE_NOPS (size);
4019 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4021 error ("size of array `%s' has non-integer type", name);
4022 size = integer_one_node;
4025 if (pedantic && integer_zerop (size))
4026 pedwarn ("ISO C forbids zero-size array `%s'", name);
4028 if (TREE_CODE (size) == INTEGER_CST)
4030 constant_expression_warning (size);
4031 if (tree_int_cst_sgn (size) < 0)
4033 error ("size of array `%s' is negative", name);
4034 size = integer_one_node;
4039 /* Make sure the array size remains visibly nonconstant
4040 even if it is (eg) a const variable with known value. */
4043 if (!flag_isoc99 && pedantic)
4045 if (TREE_CONSTANT (size))
4046 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
4049 pedwarn ("ISO C90 forbids variable-size array `%s'",
4054 if (integer_zerop (size))
4056 /* A zero-length array cannot be represented with an
4057 unsigned index type, which is what we'll get with
4058 build_index_type. Create an open-ended range instead. */
4059 itype = build_range_type (sizetype, size, NULL_TREE);
4063 /* Compute the maximum valid index, that is, size - 1.
4064 Do the calculation in index_type, so that if it is
4065 a variable the computations will be done in the
4067 itype = fold (build (MINUS_EXPR, index_type,
4068 convert (index_type, size),
4069 convert (index_type, size_one_node)));
4071 /* If that overflowed, the array is too big.
4072 ??? While a size of INT_MAX+1 technically shouldn't
4073 cause an overflow (because we subtract 1), the overflow
4074 is recorded during the conversion to index_type, before
4075 the subtraction. Handling this case seems like an
4076 unnecessary complication. */
4077 if (TREE_OVERFLOW (itype))
4079 error ("size of array `%s' is too large", name);
4080 type = error_mark_node;
4085 itype = variable_size (itype);
4086 itype = build_index_type (itype);
4089 else if (decl_context == FIELD)
4091 if (pedantic && !flag_isoc99 && !in_system_header)
4092 pedwarn ("ISO C90 does not support flexible array members");
4094 /* ISO C99 Flexible array members are effectively identical
4095 to GCC's zero-length array extension. */
4096 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4099 /* If pedantic, complain about arrays of incomplete types. */
4101 if (pedantic && !COMPLETE_TYPE_P (type))
4102 pedwarn ("array type has incomplete element type");
4104 /* Build the array type itself, then merge any constancy or
4105 volatility into the target type. We must do it in this order
4106 to ensure that the TYPE_MAIN_VARIANT field of the array type
4107 is set correctly. */
4109 type = build_array_type (type, itype);
4111 type = c_build_qualified_type (type, type_quals);
4114 C_TYPE_VARIABLE_SIZE (type) = 1;
4116 /* The GCC extension for zero-length arrays differs from
4117 ISO flexible array members in that sizeof yields zero. */
4118 if (size && integer_zerop (size))
4121 TYPE_SIZE (type) = bitsize_zero_node;
4122 TYPE_SIZE_UNIT (type) = size_zero_node;
4124 else if (declarator && TREE_CODE (declarator) == INDIRECT_REF)
4125 /* We can never complete an array type which is the target of a
4126 pointer, so go ahead and lay it out. */
4129 if (decl_context != PARM
4130 && (array_ptr_quals != NULL_TREE || array_parm_static))
4132 error ("static or type qualifiers in non-parameter array declarator");
4133 array_ptr_quals = NULL_TREE;
4134 array_parm_static = 0;
4137 else if (TREE_CODE (declarator) == CALL_EXPR)
4139 /* Say it's a definition only for the CALL_EXPR closest to
4141 bool really_funcdef = (funcdef_flag
4142 && (TREE_CODE (TREE_OPERAND (declarator, 0))
4143 == IDENTIFIER_NODE));
4146 /* Declaring a function type.
4147 Make sure we have a valid type for the function to return. */
4148 if (type == error_mark_node)
4153 /* Warn about some types functions can't return. */
4155 if (TREE_CODE (type) == FUNCTION_TYPE)
4157 error ("`%s' declared as function returning a function", name);
4158 type = integer_type_node;
4160 if (TREE_CODE (type) == ARRAY_TYPE)
4162 error ("`%s' declared as function returning an array", name);
4163 type = integer_type_node;
4166 /* Construct the function type and go to the next
4167 inner layer of declarator. */
4168 arg_info = TREE_OPERAND (declarator, 1);
4169 arg_types = grokparms (arg_info, really_funcdef);
4171 /* Type qualifiers before the return type of the function
4172 qualify the return type, not the function type. */
4175 /* Type qualifiers on a function return type are
4176 normally permitted by the standard but have no
4177 effect, so give a warning at -Wreturn-type.
4178 Qualifiers on a void return type are banned on
4179 function definitions in ISO C; GCC used to used them
4180 for noreturn functions. */
4181 if (VOID_TYPE_P (type) && really_funcdef)
4182 pedwarn ("function definition has qualified void return type");
4183 else if (warn_return_type)
4184 warning ("type qualifiers ignored on function return type");
4186 type = c_build_qualified_type (type, type_quals);
4188 type_quals = TYPE_UNQUALIFIED;
4190 type = build_function_type (type, arg_types);
4191 declarator = TREE_OPERAND (declarator, 0);
4193 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4194 the formal parameter list of this FUNCTION_TYPE to point to
4195 the FUNCTION_TYPE node itself. */
4200 for (link = ARG_INFO_TAGS (arg_info);
4202 link = TREE_CHAIN (link))
4203 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4206 else if (TREE_CODE (declarator) == INDIRECT_REF)
4208 /* Merge any constancy or volatility into the target type
4211 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4213 pedwarn ("ISO C forbids qualified function types");
4215 type = c_build_qualified_type (type, type_quals);
4216 type_quals = TYPE_UNQUALIFIED;
4219 type = build_pointer_type (type);
4221 /* Process a list of type modifier keywords
4222 (such as const or volatile) that were given inside the `*'. */
4224 if (TREE_TYPE (declarator))
4232 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4233 typemodlist = TREE_CHAIN (typemodlist))
4235 tree qualifier = TREE_VALUE (typemodlist);
4237 if (C_IS_RESERVED_WORD (qualifier))
4239 if (C_RID_CODE (qualifier) == RID_CONST)
4241 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4243 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4253 error ("invalid type modifier within pointer declarator");
4254 if (pedantic && !flag_isoc99)
4257 pedwarn ("duplicate `const'");
4259 pedwarn ("duplicate `volatile'");
4261 pedwarn ("duplicate `restrict'");
4264 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4265 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4266 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4269 declarator = TREE_OPERAND (declarator, 0);
4276 /* Now TYPE has the actual type. */
4278 /* Did array size calculations overflow? */
4280 if (TREE_CODE (type) == ARRAY_TYPE
4281 && COMPLETE_TYPE_P (type)
4282 && TREE_OVERFLOW (TYPE_SIZE (type)))
4284 error ("size of array `%s' is too large", name);
4285 /* If we proceed with the array type as it is, we'll eventually
4286 crash in tree_low_cst(). */
4287 type = error_mark_node;
4290 /* If this is declaring a typedef name, return a TYPE_DECL. */
4292 if (specbits & (1 << (int) RID_TYPEDEF))
4295 /* Note that the grammar rejects storage classes
4296 in typenames, fields or parameters */
4297 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4299 pedwarn ("ISO C forbids qualified function types");
4301 type = c_build_qualified_type (type, type_quals);
4302 decl = build_decl (TYPE_DECL, declarator, type);
4303 if ((specbits & (1 << (int) RID_SIGNED))
4304 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4305 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4306 decl_attributes (&decl, returned_attrs, 0);
4310 /* Detect the case of an array type of unspecified size
4311 which came, as such, direct from a typedef name.
4312 We must copy the type, so that each identifier gets
4313 a distinct type, so that each identifier's size can be
4314 controlled separately by its own initializer. */
4316 if (type != 0 && typedef_type != 0
4317 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4318 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4320 type = build_array_type (TREE_TYPE (type), 0);
4322 C_TYPE_VARIABLE_SIZE (type) = 1;
4325 /* If this is a type name (such as, in a cast or sizeof),
4326 compute the type and return it now. */
4328 if (decl_context == TYPENAME)
4330 /* Note that the grammar rejects storage classes
4331 in typenames, fields or parameters */
4332 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4334 pedwarn ("ISO C forbids const or volatile function types");
4336 type = c_build_qualified_type (type, type_quals);
4337 decl_attributes (&type, returned_attrs, 0);
4341 /* Aside from typedefs and type names (handle above),
4342 `void' at top level (not within pointer)
4343 is allowed only in public variables.
4344 We don't complain about parms either, but that is because
4345 a better error message can be made later. */
4347 if (VOID_TYPE_P (type) && decl_context != PARM
4348 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4349 && ((specbits & (1 << (int) RID_EXTERN))
4350 || (current_scope == file_scope
4352 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4354 error ("variable or field `%s' declared void", name);
4355 type = integer_type_node;
4358 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4359 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4364 if (decl_context == PARM)
4366 tree type_as_written;
4369 /* A parameter declared as an array of T is really a pointer to T.
4370 One declared as a function is really a pointer to a function. */
4372 if (TREE_CODE (type) == ARRAY_TYPE)
4374 /* Transfer const-ness of array into that of type pointed to. */
4375 type = TREE_TYPE (type);
4377 type = c_build_qualified_type (type, type_quals);
4378 type = build_pointer_type (type);
4379 type_quals = TYPE_UNQUALIFIED;
4380 if (array_ptr_quals)
4382 tree new_ptr_quals, new_ptr_attrs;
4384 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4385 /* We don't yet implement attributes in this context. */
4386 if (new_ptr_attrs != NULL_TREE)
4387 warning ("attributes in parameter array declarator ignored");
4392 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4394 tree qualifier = TREE_VALUE (new_ptr_quals);
4396 if (C_IS_RESERVED_WORD (qualifier))
4398 if (C_RID_CODE (qualifier) == RID_CONST)
4400 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4402 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4412 error ("invalid type modifier within array declarator");
4414 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4415 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4416 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4420 else if (TREE_CODE (type) == FUNCTION_TYPE)
4422 if (pedantic && type_quals)
4423 pedwarn ("ISO C forbids qualified function types");
4425 type = c_build_qualified_type (type, type_quals);
4426 type = build_pointer_type (type);
4427 type_quals = TYPE_UNQUALIFIED;
4429 else if (type_quals)
4430 type = c_build_qualified_type (type, type_quals);
4432 type_as_written = type;
4434 decl = build_decl (PARM_DECL, declarator, type);
4436 C_DECL_VARIABLE_SIZE (decl) = 1;
4438 /* Compute the type actually passed in the parmlist,
4439 for the case where there is no prototype.
4440 (For example, shorts and chars are passed as ints.)
4441 When there is a prototype, this is overridden later. */
4443 if (type == error_mark_node)
4444 promoted_type = type;
4446 promoted_type = c_type_promotes_to (type);
4448 DECL_ARG_TYPE (decl) = promoted_type;
4449 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4451 else if (decl_context == FIELD)
4453 /* Structure field. It may not be a function. */
4455 if (TREE_CODE (type) == FUNCTION_TYPE)
4457 error ("field `%s' declared as a function", name);
4458 type = build_pointer_type (type);
4460 else if (TREE_CODE (type) != ERROR_MARK
4461 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4463 error ("field `%s' has incomplete type", name);
4464 type = error_mark_node;
4466 /* Move type qualifiers down to element of an array. */
4467 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4468 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4470 TYPE_DOMAIN (type));
4471 decl = build_decl (FIELD_DECL, declarator, type);
4472 DECL_NONADDRESSABLE_P (decl) = bitfield;
4475 C_DECL_VARIABLE_SIZE (decl) = 1;
4477 else if (TREE_CODE (type) == FUNCTION_TYPE)
4479 if (specbits & (1 << (int) RID_AUTO)
4480 && (pedantic || current_scope == file_scope))
4481 pedwarn ("invalid storage class for function `%s'", name);
4482 if (specbits & (1 << (int) RID_REGISTER))
4483 error ("invalid storage class for function `%s'", name);
4484 if (specbits & (1 << (int) RID_THREAD))
4485 error ("invalid storage class for function `%s'", name);
4486 /* Function declaration not at file scope.
4487 Storage classes other than `extern' are not allowed
4488 and `extern' makes no difference. */
4489 if (current_scope != file_scope
4490 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4492 pedwarn ("invalid storage class for function `%s'", name);
4494 decl = build_decl (FUNCTION_DECL, declarator, type);
4495 decl = build_decl_attribute_variant (decl, decl_attr);
4497 DECL_LANG_SPECIFIC (decl)
4498 = ggc_alloc_cleared (sizeof (struct lang_decl));
4500 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4501 pedwarn ("ISO C forbids qualified function types");
4503 /* GNU C interprets a volatile-qualified function type to indicate
4504 that the function does not return. */
4505 if ((type_quals & TYPE_QUAL_VOLATILE)
4506 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4507 warning ("`noreturn' function returns non-void value");
4509 /* Every function declaration is an external reference
4510 (DECL_EXTERNAL) except for those which are not at file
4511 scope and are explicitly declared "auto". This is
4512 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4513 GCC to signify a forward declaration of a nested function. */
4514 if ((specbits & (1 << RID_AUTO)) && current_scope != file_scope)
4515 DECL_EXTERNAL (decl) = 0;
4517 DECL_EXTERNAL (decl) = 1;
4519 /* Record absence of global scope for `static' or `auto'. */
4521 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4523 /* For a function definition, record the argument information
4524 block in DECL_ARGUMENTS where store_parm_decls will look
4527 DECL_ARGUMENTS (decl) = arg_info;
4530 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4532 /* Record presence of `inline', if it is reasonable. */
4533 if (MAIN_NAME_P (declarator))
4536 warning ("cannot inline function `main'");
4540 /* Record that the function is declared `inline'. */
4541 DECL_DECLARED_INLINE_P (decl) = 1;
4543 /* Do not mark bare declarations as DECL_INLINE. Doing so
4544 in the presence of multiple declarations can result in
4545 the abstract origin pointing between the declarations,
4546 which will confuse dwarf2out. */
4549 DECL_INLINE (decl) = 1;
4550 if (specbits & (1 << (int) RID_EXTERN))
4551 current_extern_inline = 1;
4554 /* If -finline-functions, assume it can be inlined. This does
4555 two things: let the function be deferred until it is actually
4556 needed, and let dwarf2 know that the function is inlinable. */
4557 else if (flag_inline_trees == 2 && initialized)
4558 DECL_INLINE (decl) = 1;
4562 /* It's a variable. */
4563 /* An uninitialized decl with `extern' is a reference. */
4564 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4566 /* Move type qualifiers down to element of an array. */
4567 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4569 int saved_align = TYPE_ALIGN(type);
4570 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4572 TYPE_DOMAIN (type));
4573 TYPE_ALIGN (type) = saved_align;
4575 else if (type_quals)
4576 type = c_build_qualified_type (type, type_quals);
4578 /* C99 6.2.2p7: It is invalid (compile-time undefined
4579 behavior) to create an 'extern' declaration for a
4580 variable if there is a global declaration that is
4581 'static' and the global declaration is not visible.
4582 (If the static declaration _is_ currently visible,
4583 the 'extern' declaration is taken to refer to that decl.) */
4584 if (extern_ref && current_scope != file_scope)
4586 tree global_decl = identifier_global_value (declarator);
4587 tree visible_decl = lookup_name (declarator);
4590 && global_decl != visible_decl
4591 && TREE_CODE (global_decl) == VAR_DECL
4592 && !TREE_PUBLIC (global_decl))
4593 error ("variable previously declared 'static' redeclared "
4597 decl = build_decl (VAR_DECL, declarator, type);
4599 C_DECL_VARIABLE_SIZE (decl) = 1;
4602 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4604 /* At file scope, an initialized extern declaration may follow
4605 a static declaration. In that case, DECL_EXTERNAL will be
4606 reset later in start_decl. */
4607 DECL_EXTERNAL (decl) = !!(specbits & (1 << (int) RID_EXTERN));
4609 /* At file scope, the presence of a `static' or `register' storage
4610 class specifier, or the absence of all storage class specifiers
4611 makes this declaration a definition (perhaps tentative). Also,
4612 the absence of both `static' and `register' makes it public. */
4613 if (current_scope == file_scope)
4615 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4616 | (1 << (int) RID_REGISTER)));
4617 TREE_STATIC (decl) = !extern_ref;
4619 /* Not at file scope, only `static' makes a static definition. */
4622 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4623 TREE_PUBLIC (decl) = extern_ref;
4626 if (specbits & 1 << (int) RID_THREAD)
4628 if (targetm.have_tls)
4629 DECL_THREAD_LOCAL (decl) = 1;
4631 /* A mere warning is sure to result in improper semantics
4632 at runtime. Don't bother to allow this to compile. */
4633 error ("thread-local storage not supported for this target");
4637 /* Record `register' declaration for warnings on &
4638 and in case doing stupid register allocation. */
4640 if (specbits & (1 << (int) RID_REGISTER))
4642 C_DECL_REGISTER (decl) = 1;
4643 DECL_REGISTER (decl) = 1;
4646 /* Record constancy and volatility. */
4647 c_apply_type_quals_to_decl (type_quals, decl);
4649 /* If a type has volatile components, it should be stored in memory.
4650 Otherwise, the fact that those components are volatile
4651 will be ignored, and would even crash the compiler. */
4652 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4654 /* It is not an error for a structure with volatile fields to
4655 be declared register, but reset DECL_REGISTER since it
4656 cannot actually go in a register. */
4657 int was_reg = C_DECL_REGISTER (decl);
4658 C_DECL_REGISTER (decl) = 0;
4659 DECL_REGISTER (decl) = 0;
4660 c_mark_addressable (decl);
4661 C_DECL_REGISTER (decl) = was_reg;
4664 #ifdef ENABLE_CHECKING
4665 /* This is the earliest point at which we might know the assembler
4666 name of a variable. Thus, if it's known before this, die horribly. */
4667 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4671 decl_attributes (&decl, returned_attrs, 0);
4677 /* Decode the parameter-list info for a function type or function definition.
4678 The argument is the value returned by `get_parm_info' (or made in parse.y
4679 if there is an identifier list instead of a parameter decl list).
4680 These two functions are separate because when a function returns
4681 or receives functions then each is called multiple times but the order
4682 of calls is different. The last call to `grokparms' is always the one
4683 that contains the formal parameter names of a function definition.
4685 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4687 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4688 a mere declaration. A nonempty identifier-list gets an error message
4689 when FUNCDEF_FLAG is zero. */
4692 grokparms (tree arg_info, int funcdef_flag)
4694 tree arg_types = ARG_INFO_TYPES (arg_info);
4696 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4697 && !in_system_header)
4698 warning ("function declaration isn't a prototype");
4700 if (arg_types == error_mark_node)
4701 return 0; /* don't set TYPE_ARG_TYPES in this case */
4703 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4706 pedwarn ("parameter names (without types) in function declaration");
4708 ARG_INFO_PARMS (arg_info) = ARG_INFO_TYPES (arg_info);
4709 ARG_INFO_TYPES (arg_info) = 0;
4714 tree parm, type, typelt;
4715 unsigned int parmno;
4717 /* If the arg types are incomplete in a declaration, they must
4718 include undefined tags. These tags can never be defined in
4719 the scope of the declaration, so the types can never be
4720 completed, and no call can be compiled successfully. */
4722 for (parm = ARG_INFO_PARMS (arg_info), typelt = arg_types, parmno = 1;
4724 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4726 type = TREE_VALUE (typelt);
4727 if (type == error_mark_node)
4730 if (!COMPLETE_TYPE_P (type))
4734 if (DECL_NAME (parm))
4735 error ("%Jparameter %u ('%D') has incomplete type",
4736 parm, parmno, parm);
4738 error ("%Jparameter %u has incomplete type",
4741 TREE_VALUE (typelt) = error_mark_node;
4742 TREE_TYPE (parm) = error_mark_node;
4746 if (DECL_NAME (parm))
4747 warning ("%Jparameter %u ('%D') has incomplete type",
4748 parm, parmno, parm);
4750 warning ("%Jparameter %u has incomplete type",
4759 /* Take apart the current scope and return a tree_list node with info
4760 on a parameter list just parsed. This tree_list node should be
4761 examined using the ARG_INFO_* macros, defined above:
4763 ARG_INFO_PARMS: a list of parameter decls.
4764 ARG_INFO_TAGS: a list of structure, union and enum tags defined.
4765 ARG_INFO_TYPES: a list of argument types to go in the FUNCTION_TYPE.
4766 ARG_INFO_OTHERS: a list of non-parameter decls (notably enumeration
4767 constants) defined with the parameters.
4769 This tree_list node is later fed to 'grokparms' and 'store_parm_decls'.
4771 ELLIPSIS being true means the argument list ended in '...' so don't
4772 append a sentinel (void_list_node) to the end of the type-list. */
4775 get_parm_info (bool ellipsis)
4777 struct c_binding *b = current_scope->bindings;
4778 tree arg_info = make_node (TREE_LIST);
4784 static bool explained_incomplete_types = false;
4785 bool gave_void_only_once_err = false;
4787 /* The bindings in this scope must not get put into a block.
4788 We will take care of deleting the binding nodes. */
4789 current_scope->bindings = 0;
4791 /* This function is only called if there was *something* on the
4793 #ifdef ENABLE_CHECKING
4798 /* A parameter list consisting solely of 'void' indicates that the
4799 function takes no arguments. But if the 'void' is qualified
4800 (by 'const' or 'volatile'), or has a storage class specifier
4801 ('register'), then the behavior is undefined; issue an error.
4802 Typedefs for 'void' are OK (see DR#157). */
4803 if (b->prev == 0 /* one binding */
4804 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4805 && !DECL_NAME (b->decl) /* anonymous */
4806 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4808 if (TREE_THIS_VOLATILE (b->decl)
4809 || TREE_READONLY (b->decl)
4810 || C_DECL_REGISTER (b->decl))
4811 error ("'void' as only parameter may not be qualified");
4813 /* There cannot be an ellipsis. */
4815 error ("'void' must be the only parameter");
4817 ARG_INFO_TYPES (arg_info) = void_list_node;
4822 types = void_list_node;
4824 /* Break up the bindings list into parms, tags, types, and others;
4825 apply sanity checks; purge the name-to-decl bindings. */
4828 tree decl = b->decl;
4829 tree type = TREE_TYPE (decl);
4830 const char *keyword;
4832 switch (TREE_CODE (decl))
4837 #ifdef ENABLE_CHECKING
4838 if (I_SYMBOL_BINDING (b->id) != b) abort ();
4840 I_SYMBOL_BINDING (b->id) = b->shadowed;
4843 /* Check for forward decls that never got their actual decl. */
4844 if (TREE_ASM_WRITTEN (decl))
4845 error ("%Jparameter '%D' has just a forward declaration",
4847 /* Check for (..., void, ...) and issue an error. */
4848 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4850 if (!gave_void_only_once_err)
4852 error ("'void' must be the only parameter");
4853 gave_void_only_once_err = true;
4858 /* Valid parameter, add it to the list. */
4859 TREE_CHAIN (decl) = parms;
4862 /* Since there is a prototype, args are passed in their
4863 declared types. The back end may override this later. */
4864 DECL_ARG_TYPE (decl) = type;
4865 types = tree_cons (0, type, types);
4869 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4870 case UNION_TYPE: keyword = "union"; goto tag;
4871 case RECORD_TYPE: keyword = "struct"; goto tag;
4873 /* Types may not have tag-names, in which case the type
4874 appears in the bindings list with b->id NULL. */
4877 #ifdef ENABLE_CHECKING
4878 if (I_TAG_BINDING (b->id) != b) abort ();
4880 I_TAG_BINDING (b->id) = b->shadowed;
4883 /* Warn about any struct, union or enum tags defined in a
4884 parameter list. The scope of such types is limited to
4885 the parameter list, which is rarely if ever desirable
4886 (it's impossible to call such a function with type-
4887 correct arguments). An anonymous union parm type is
4888 meaningful as a GNU extension, so don't warn for that. */
4889 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4892 /* The %s will be one of 'struct', 'union', or 'enum'. */
4893 warning ("'%s %E' declared inside parameter list",
4896 /* The %s will be one of 'struct', 'union', or 'enum'. */
4897 warning ("anonymous %s declared inside parameter list",
4900 if (! explained_incomplete_types)
4902 warning ("its scope is only this definition or declaration,"
4903 " which is probably not what you want");
4904 explained_incomplete_types = true;
4908 tags = tree_cons (b->id, decl, tags);
4913 /* CONST_DECLs appear here when we have an embedded enum,
4914 and TYPE_DECLs appear here when we have an embedded struct
4915 or union. No warnings for this - we already warned about the
4917 TREE_CHAIN (decl) = others;
4922 /* error_mark_node appears here when we have an undeclared
4923 variable. Just throw it away. */
4926 #ifdef ENABLE_CHECKING
4927 if (I_SYMBOL_BINDING (b->id) != b) abort ();
4929 I_SYMBOL_BINDING (b->id) = b->shadowed;
4933 /* Other things that might be encountered. */
4941 b = free_binding_and_advance (b);
4944 ARG_INFO_PARMS (arg_info) = parms;
4945 ARG_INFO_TAGS (arg_info) = tags;
4946 ARG_INFO_TYPES (arg_info) = types;
4947 ARG_INFO_OTHERS (arg_info) = others;
4951 /* Get the struct, enum or union (CODE says which) with tag NAME.
4952 Define the tag as a forward-reference if it is not defined. */
4955 xref_tag (enum tree_code code, tree name)
4957 /* If a cross reference is requested, look up the type
4958 already defined for this tag and return it. */
4960 tree ref = lookup_tag (code, name, 0);
4961 /* If this is the right type of tag, return what we found.
4962 (This reference will be shadowed by shadow_tag later if appropriate.)
4963 If this is the wrong type of tag, do not return it. If it was the
4964 wrong type in the same scope, we will have had an error
4965 message already; if in a different scope and declaring
4966 a name, pending_xref_error will give an error message; but if in a
4967 different scope and not declaring a name, this tag should
4968 shadow the previous declaration of a different type of tag, and
4969 this would not work properly if we return the reference found.
4970 (For example, with "struct foo" in an outer scope, "union foo;"
4971 must shadow that tag with a new one of union type.) */
4972 if (ref && TREE_CODE (ref) == code)
4975 /* If no such tag is yet defined, create a forward-reference node
4976 and record it as the "definition".
4977 When a real declaration of this type is found,
4978 the forward-reference will be altered into a real type. */
4980 ref = make_node (code);
4981 if (code == ENUMERAL_TYPE)
4983 /* Give the type a default layout like unsigned int
4984 to avoid crashing if it does not get defined. */
4985 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4986 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4987 TYPE_USER_ALIGN (ref) = 0;
4988 TYPE_UNSIGNED (ref) = 1;
4989 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4990 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4991 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4994 pushtag (name, ref);
4999 /* Make sure that the tag NAME is defined *in the current scope*
5000 at least as a forward reference.
5001 CODE says which kind of tag NAME ought to be. */
5004 start_struct (enum tree_code code, tree name)
5006 /* If there is already a tag defined at this scope
5007 (as a forward reference), just return it. */
5012 ref = lookup_tag (code, name, 1);
5013 if (ref && TREE_CODE (ref) == code)
5015 if (TYPE_FIELDS (ref))
5017 if (code == UNION_TYPE)
5018 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
5020 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
5025 /* Otherwise create a forward-reference just so the tag is in scope. */
5027 ref = make_node (code);
5028 pushtag (name, ref);
5031 C_TYPE_BEING_DEFINED (ref) = 1;
5032 TYPE_PACKED (ref) = flag_pack_struct;
5036 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5037 of a structure component, returning a FIELD_DECL node.
5038 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5040 This is done during the parsing of the struct declaration.
5041 The FIELD_DECL nodes are chained together and the lot of them
5042 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5045 grokfield (tree declarator, tree declspecs, tree width)
5049 if (declarator == NULL_TREE && width == NULL_TREE)
5051 /* This is an unnamed decl.
5053 If we have something of the form "union { list } ;" then this
5054 is the anonymous union extension. Similarly for struct.
5056 If this is something of the form "struct foo;", then
5057 If MS extensions are enabled, this is handled as an
5059 Otherwise this is a forward declaration of a structure tag.
5061 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5062 If MS extensions are enabled and foo names a structure, then
5063 again this is an anonymous struct.
5064 Otherwise this is an error.
5066 Oh what a horrid tangled web we weave. I wonder if MS consciously
5067 took this from Plan 9 or if it was an accident of implementation
5068 that took root before someone noticed the bug... */
5070 tree type = TREE_VALUE (declspecs);
5072 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
5073 type = TREE_TYPE (type);
5074 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
5076 if (flag_ms_extensions)
5079 goto warn_unnamed_field;
5080 else if (TYPE_NAME (type) == NULL)
5083 goto warn_unnamed_field;
5088 warning ("declaration does not declare anything");
5093 value = grokdeclarator (declarator, declspecs, FIELD, 0,
5094 width ? &width : NULL);
5096 finish_decl (value, NULL_TREE, NULL_TREE);
5097 DECL_INITIAL (value) = width;
5102 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5103 the list such that this does not present a problem later. */
5106 detect_field_duplicates (tree fieldlist)
5111 /* First, see if there are more than "a few" fields.
5112 This is trivially true if there are zero or one fields. */
5115 x = TREE_CHAIN (fieldlist);
5121 } while (timeout > 0 && x);
5123 /* If there were "few" fields, avoid the overhead of allocating
5124 a hash table. Instead just do the nested traversal thing. */
5127 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5130 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5131 if (DECL_NAME (y) == DECL_NAME (x))
5133 error ("%Jduplicate member '%D'", x, x);
5134 DECL_NAME (x) = NULL_TREE;
5140 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5143 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5144 if ((y = DECL_NAME (x)) != 0)
5146 slot = htab_find_slot (htab, y, INSERT);
5149 error ("%Jduplicate member '%D'", x, x);
5150 DECL_NAME (x) = NULL_TREE;
5159 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5160 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5161 ATTRIBUTES are attributes to be applied to the structure. */
5164 finish_struct (tree t, tree fieldlist, tree attributes)
5167 bool toplevel = file_scope == current_scope;
5168 int saw_named_field;
5170 /* If this type was previously laid out as a forward reference,
5171 make sure we lay it out again. */
5175 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5179 for (x = fieldlist; x; x = TREE_CHAIN (x))
5180 if (DECL_NAME (x) != 0)
5184 pedwarn ("%s has no %s",
5185 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5186 fieldlist ? _("named members") : _("members"));
5189 /* Install struct as DECL_CONTEXT of each field decl.
5190 Also process specified field sizes, found in the DECL_INITIAL,
5191 storing 0 there after the type has been changed to precision equal
5192 to its width, rather than the precision of the specified standard
5193 type. (Correct layout requires the original type to have been preserved
5196 saw_named_field = 0;
5197 for (x = fieldlist; x; x = TREE_CHAIN (x))
5199 DECL_CONTEXT (x) = t;
5200 DECL_PACKED (x) |= TYPE_PACKED (t);
5202 /* If any field is const, the structure type is pseudo-const. */
5203 if (TREE_READONLY (x))
5204 C_TYPE_FIELDS_READONLY (t) = 1;
5207 /* A field that is pseudo-const makes the structure likewise. */
5208 tree t1 = TREE_TYPE (x);
5209 while (TREE_CODE (t1) == ARRAY_TYPE)
5210 t1 = TREE_TYPE (t1);
5211 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5212 && C_TYPE_FIELDS_READONLY (t1))
5213 C_TYPE_FIELDS_READONLY (t) = 1;
5216 /* Any field that is volatile means variables of this type must be
5217 treated in some ways as volatile. */
5218 if (TREE_THIS_VOLATILE (x))
5219 C_TYPE_FIELDS_VOLATILE (t) = 1;
5221 /* Any field of nominal variable size implies structure is too. */
5222 if (C_DECL_VARIABLE_SIZE (x))
5223 C_TYPE_VARIABLE_SIZE (t) = 1;
5225 /* Detect invalid nested redefinition. */
5226 if (TREE_TYPE (x) == t)
5227 error ("nested redefinition of `%s'",
5228 IDENTIFIER_POINTER (TYPE_NAME (t)));
5230 if (DECL_INITIAL (x))
5232 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5233 DECL_SIZE (x) = bitsize_int (width);
5234 DECL_BIT_FIELD (x) = 1;
5235 SET_DECL_C_BIT_FIELD (x);
5238 /* Detect flexible array member in an invalid context. */
5239 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5240 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5241 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5242 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5244 if (TREE_CODE (t) == UNION_TYPE)
5246 error ("%Jflexible array member in union", x);
5247 TREE_TYPE (x) = error_mark_node;
5249 else if (TREE_CHAIN (x) != NULL_TREE)
5251 error ("%Jflexible array member not at end of struct", x);
5252 TREE_TYPE (x) = error_mark_node;
5254 else if (! saw_named_field)
5256 error ("%Jflexible array member in otherwise empty struct", x);
5257 TREE_TYPE (x) = error_mark_node;
5261 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5262 && flexible_array_type_p (TREE_TYPE (x)))
5263 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5266 saw_named_field = 1;
5269 detect_field_duplicates (fieldlist);
5271 /* Now we have the nearly final fieldlist. Record it,
5272 then lay out the structure or union (including the fields). */
5274 TYPE_FIELDS (t) = fieldlist;
5278 /* Give bit-fields their proper types. */
5280 tree *fieldlistp = &fieldlist;
5282 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5283 && TREE_TYPE (*fieldlistp) != error_mark_node)
5285 unsigned HOST_WIDE_INT width
5286 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5287 tree type = TREE_TYPE (*fieldlistp);
5288 if (width != TYPE_PRECISION (type))
5289 TREE_TYPE (*fieldlistp)
5290 = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
5291 DECL_INITIAL (*fieldlistp) = 0;
5294 fieldlistp = &TREE_CHAIN (*fieldlistp);
5297 /* Now we have the truly final field list.
5298 Store it in this type and in the variants. */
5300 TYPE_FIELDS (t) = fieldlist;
5302 /* If there are lots of fields, sort so we can look through them fast.
5303 We arbitrarily consider 16 or more elts to be "a lot". */
5308 for (x = fieldlist; x; x = TREE_CHAIN (x))
5310 if (len > 15 || DECL_NAME (x) == NULL)
5318 struct lang_type *space;
5319 struct sorted_fields_type *space2;
5321 len += list_length (x);
5323 /* Use the same allocation policy here that make_node uses, to
5324 ensure that this lives as long as the rest of the struct decl.
5325 All decls in an inline function need to be saved. */
5327 space = ggc_alloc_cleared (sizeof (struct lang_type));
5328 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5332 field_array = &space2->elts[0];
5333 for (x = fieldlist; x; x = TREE_CHAIN (x))
5335 field_array[len++] = x;
5337 /* If there is anonymous struct or union, break out of the loop. */
5338 if (DECL_NAME (x) == NULL)
5341 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5344 TYPE_LANG_SPECIFIC (t) = space;
5345 TYPE_LANG_SPECIFIC (t)->s->len = len;
5346 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5347 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5352 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5354 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5355 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5356 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5357 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5360 /* If this was supposed to be a transparent union, but we can't
5361 make it one, warn and turn off the flag. */
5362 if (TREE_CODE (t) == UNION_TYPE
5363 && TYPE_TRANSPARENT_UNION (t)
5364 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5366 TYPE_TRANSPARENT_UNION (t) = 0;
5367 warning ("union cannot be made transparent");
5370 /* If this structure or union completes the type of any previous
5371 variable declaration, lay it out and output its rtl. */
5372 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5376 tree decl = TREE_VALUE (x);
5377 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5378 layout_array_type (TREE_TYPE (decl));
5379 if (TREE_CODE (decl) != TYPE_DECL)
5381 layout_decl (decl, 0);
5382 if (c_dialect_objc ())
5383 objc_check_decl (decl);
5384 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5389 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5391 /* Finish debugging output for this type. */
5392 rest_of_type_compilation (t, toplevel);
5397 /* Lay out the type T, and its element type, and so on. */
5400 layout_array_type (tree t)
5402 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5403 layout_array_type (TREE_TYPE (t));
5407 /* Begin compiling the definition of an enumeration type.
5408 NAME is its name (or null if anonymous).
5409 Returns the type object, as yet incomplete.
5410 Also records info about it so that build_enumerator
5411 may be used to declare the individual values as they are read. */
5414 start_enum (tree name)
5418 /* If this is the real definition for a previous forward reference,
5419 fill in the contents in the same object that used to be the
5420 forward reference. */
5423 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5425 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5427 enumtype = make_node (ENUMERAL_TYPE);
5428 pushtag (name, enumtype);
5431 C_TYPE_BEING_DEFINED (enumtype) = 1;
5433 if (TYPE_VALUES (enumtype) != 0)
5435 /* This enum is a named one that has been declared already. */
5436 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5438 /* Completely replace its old definition.
5439 The old enumerators remain defined, however. */
5440 TYPE_VALUES (enumtype) = 0;
5443 enum_next_value = integer_zero_node;
5446 if (flag_short_enums)
5447 TYPE_PACKED (enumtype) = 1;
5452 /* After processing and defining all the values of an enumeration type,
5453 install their decls in the enumeration type and finish it off.
5454 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5455 and ATTRIBUTES are the specified attributes.
5456 Returns ENUMTYPE. */
5459 finish_enum (tree enumtype, tree values, tree attributes)
5462 tree minnode = 0, maxnode = 0;
5463 int precision, unsign;
5464 bool toplevel = (file_scope == current_scope);
5465 struct lang_type *lt;
5467 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5469 /* Calculate the maximum value of any enumerator in this type. */
5471 if (values == error_mark_node)
5472 minnode = maxnode = integer_zero_node;
5475 minnode = maxnode = TREE_VALUE (values);
5476 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5478 tree value = TREE_VALUE (pair);
5479 if (tree_int_cst_lt (maxnode, value))
5481 if (tree_int_cst_lt (value, minnode))
5486 /* Construct the final type of this enumeration. It is the same
5487 as one of the integral types - the narrowest one that fits, except
5488 that normally we only go as narrow as int - and signed iff any of
5489 the values are negative. */
5490 unsign = (tree_int_cst_sgn (minnode) >= 0);
5491 precision = MAX (min_precision (minnode, unsign),
5492 min_precision (maxnode, unsign));
5493 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5495 tem = c_common_type_for_size (precision, unsign);
5498 warning ("enumeration values exceed range of largest integer");
5499 tem = long_long_integer_type_node;
5503 tem = unsign ? unsigned_type_node : integer_type_node;
5505 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5506 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5507 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5508 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5509 TYPE_SIZE (enumtype) = 0;
5510 layout_type (enumtype);
5512 if (values != error_mark_node)
5514 /* Change the type of the enumerators to be the enum type. We
5515 need to do this irrespective of the size of the enum, for
5516 proper type checking. Replace the DECL_INITIALs of the
5517 enumerators, and the value slots of the list, with copies
5518 that have the enum type; they cannot be modified in place
5519 because they may be shared (e.g. integer_zero_node) Finally,
5520 change the purpose slots to point to the names of the decls. */
5521 for (pair = values; pair; pair = TREE_CHAIN (pair))
5523 tree enu = TREE_PURPOSE (pair);
5524 tree ini = DECL_INITIAL (enu);
5526 TREE_TYPE (enu) = enumtype;
5528 /* The ISO C Standard mandates enumerators to have type int,
5529 even though the underlying type of an enum type is
5530 unspecified. Here we convert any enumerators that fit in
5531 an int to type int, to avoid promotions to unsigned types
5532 when comparing integers with enumerators that fit in the
5533 int range. When -pedantic is given, build_enumerator()
5534 would have already taken care of those that don't fit. */
5535 if (int_fits_type_p (ini, integer_type_node))
5536 tem = integer_type_node;
5539 ini = convert (tem, ini);
5541 DECL_INITIAL (enu) = ini;
5542 TREE_PURPOSE (pair) = DECL_NAME (enu);
5543 TREE_VALUE (pair) = ini;
5546 TYPE_VALUES (enumtype) = values;
5549 /* Record the min/max values so that we can warn about bit-field
5550 enumerations that are too small for the values. */
5551 lt = ggc_alloc_cleared (sizeof (struct lang_type));
5552 lt->enum_min = minnode;
5553 lt->enum_max = maxnode;
5554 TYPE_LANG_SPECIFIC (enumtype) = lt;
5556 /* Fix up all variant types of this enum type. */
5557 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5559 if (tem == enumtype)
5561 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5562 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5563 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5564 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5565 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5566 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5567 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5568 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5569 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5570 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5571 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5574 /* Finish debugging output for this type. */
5575 rest_of_type_compilation (enumtype, toplevel);
5580 /* Build and install a CONST_DECL for one value of the
5581 current enumeration type (one that was begun with start_enum).
5582 Return a tree-list containing the CONST_DECL and its value.
5583 Assignment of sequential values by default is handled here. */
5586 build_enumerator (tree name, tree value)
5590 /* Validate and default VALUE. */
5592 /* Remove no-op casts from the value. */
5594 STRIP_TYPE_NOPS (value);
5598 /* Don't issue more errors for error_mark_node (i.e. an
5599 undeclared identifier) - just ignore the value expression. */
5600 if (value == error_mark_node)
5602 else if (TREE_CODE (value) != INTEGER_CST)
5604 error ("enumerator value for '%E' is not an integer constant", name);
5609 value = default_conversion (value);
5610 constant_expression_warning (value);
5614 /* Default based on previous value. */
5615 /* It should no longer be possible to have NON_LVALUE_EXPR
5619 value = enum_next_value;
5621 error ("overflow in enumeration values");
5624 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5626 pedwarn ("ISO C restricts enumerator values to range of `int'");
5627 /* XXX This causes -pedantic to change the meaning of the program.
5628 Remove? -zw 2004-03-15 */
5629 value = convert (integer_type_node, value);
5632 /* Set basis for default for next value. */
5633 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5634 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5636 /* Now create a declaration for the enum value name. */
5638 type = TREE_TYPE (value);
5639 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5640 TYPE_PRECISION (integer_type_node)),
5641 (TYPE_PRECISION (type)
5642 >= TYPE_PRECISION (integer_type_node)
5643 && TYPE_UNSIGNED (type)));
5645 decl = build_decl (CONST_DECL, name, type);
5646 DECL_INITIAL (decl) = convert (type, value);
5649 return tree_cons (decl, value, NULL_TREE);
5653 /* Create the FUNCTION_DECL for a function definition.
5654 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5655 the declaration; they describe the function's name and the type it returns,
5656 but twisted together in a fashion that parallels the syntax of C.
5658 This function creates a binding context for the function body
5659 as well as setting up the FUNCTION_DECL in current_function_decl.
5661 Returns 1 on success. If the DECLARATOR is not suitable for a function
5662 (it defines a datum instead), we return 0, which tells
5663 yyparse to report a parse error. */
5666 start_function (tree declspecs, tree declarator, tree attributes)
5668 tree decl1, old_decl;
5669 tree restype, resdecl;
5671 current_function_returns_value = 0; /* Assume, until we see it does. */
5672 current_function_returns_null = 0;
5673 current_function_returns_abnormally = 0;
5674 warn_about_return_type = 0;
5675 current_extern_inline = 0;
5676 c_switch_stack = NULL;
5678 /* Indicate no valid break/continue context by setting these variables
5679 to some non-null, non-label value. We'll notice and emit the proper
5680 error message in c_finish_bc_stmt. */
5681 c_break_label = c_cont_label = size_zero_node;
5683 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, NULL);
5685 /* If the declarator is not suitable for a function definition,
5686 cause a syntax error. */
5690 decl_attributes (&decl1, attributes, 0);
5692 if (DECL_DECLARED_INLINE_P (decl1)
5693 && DECL_UNINLINABLE (decl1)
5694 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5695 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5697 announce_function (decl1);
5699 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5701 error ("return type is an incomplete type");
5702 /* Make it return void instead. */
5704 = build_function_type (void_type_node,
5705 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5708 if (warn_about_return_type)
5709 pedwarn_c99 ("return type defaults to `int'");
5711 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5712 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5713 DECL_INITIAL (decl1) = error_mark_node;
5715 /* If this definition isn't a prototype and we had a prototype declaration
5716 before, copy the arg type info from that prototype.
5717 But not if what we had before was a builtin function. */
5718 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5719 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5720 && !DECL_BUILT_IN (old_decl)
5721 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5722 TREE_TYPE (TREE_TYPE (old_decl)))
5723 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5725 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5727 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5730 /* Optionally warn of old-fashioned def with no previous prototype. */
5731 if (warn_strict_prototypes
5732 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5733 && C_DECL_ISNT_PROTOTYPE (old_decl))
5734 warning ("function declaration isn't a prototype");
5735 /* Optionally warn of any global def with no previous prototype. */
5736 else if (warn_missing_prototypes
5737 && TREE_PUBLIC (decl1)
5738 && ! MAIN_NAME_P (DECL_NAME (decl1))
5739 && C_DECL_ISNT_PROTOTYPE (old_decl))
5740 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5741 /* Optionally warn of any def with no previous prototype
5742 if the function has already been used. */
5743 else if (warn_missing_prototypes
5744 && old_decl != 0 && TREE_USED (old_decl)
5745 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5746 warning ("%J'%D' was used with no prototype before its definition",
5748 /* Optionally warn of any global def with no previous declaration. */
5749 else if (warn_missing_declarations
5750 && TREE_PUBLIC (decl1)
5752 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5753 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5754 /* Optionally warn of any def with no previous declaration
5755 if the function has already been used. */
5756 else if (warn_missing_declarations
5757 && old_decl != 0 && TREE_USED (old_decl)
5758 && C_DECL_IMPLICIT (old_decl))
5759 warning ("%J`%D' was used with no declaration before its definition",
5762 /* This is a definition, not a reference.
5763 So normally clear DECL_EXTERNAL.
5764 However, `extern inline' acts like a declaration
5765 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5766 DECL_EXTERNAL (decl1) = current_extern_inline;
5768 /* This function exists in static storage.
5769 (This does not mean `static' in the C sense!) */
5770 TREE_STATIC (decl1) = 1;
5772 /* A nested function is not global. */
5773 if (current_function_decl != 0)
5774 TREE_PUBLIC (decl1) = 0;
5776 #ifdef ENABLE_CHECKING
5777 /* This is the earliest point at which we might know the assembler
5778 name of the function. Thus, if it's set before this, die horribly. */
5779 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5783 /* If #pragma weak was used, mark the decl weak now. */
5784 if (current_scope == file_scope)
5785 maybe_apply_pragma_weak (decl1);
5787 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5788 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5793 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5794 != integer_type_node)
5795 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5797 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5798 args = TREE_CHAIN (args))
5800 tree type = args ? TREE_VALUE (args) : 0;
5802 if (type == void_type_node)
5809 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5810 pedwarn ("%Jfirst argument of '%D' should be `int'",
5815 if (TREE_CODE (type) != POINTER_TYPE
5816 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5817 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5819 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5824 if (TREE_CODE (type) != POINTER_TYPE
5825 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5826 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5828 pedwarn ("%Jthird argument of '%D' should probably be "
5829 "'char **'", decl1, decl1);
5834 /* It is intentional that this message does not mention the third
5835 argument because it's only mentioned in an appendix of the
5837 if (argct > 0 && (argct < 2 || argct > 3))
5838 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5840 if (! TREE_PUBLIC (decl1))
5841 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5844 /* Record the decl so that the function name is defined.
5845 If we already have a decl for this name, and it is a FUNCTION_DECL,
5846 use the old decl. */
5848 current_function_decl = pushdecl (decl1);
5851 declare_parm_level ();
5853 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5854 /* Promote the value to int before returning it. */
5855 if (c_promoting_integer_type_p (restype))
5857 /* It retains unsignedness if not really getting wider. */
5858 if (TYPE_UNSIGNED (restype)
5859 && (TYPE_PRECISION (restype)
5860 == TYPE_PRECISION (integer_type_node)))
5861 restype = unsigned_type_node;
5863 restype = integer_type_node;
5866 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
5867 DECL_ARTIFICIAL (resdecl) = 1;
5868 DECL_IGNORED_P (resdecl) = 1;
5869 DECL_RESULT (current_function_decl) = resdecl;
5871 start_fname_decls ();
5876 /* Subroutine of store_parm_decls which handles new-style function
5877 definitions (prototype format). The parms already have decls, so we
5878 need only record them as in effect and complain if any redundant
5879 old-style parm decls were written. */
5881 store_parm_decls_newstyle (tree fndecl, tree arg_info)
5884 tree parms = ARG_INFO_PARMS (arg_info);
5885 tree tags = ARG_INFO_TAGS (arg_info);
5886 tree others = ARG_INFO_OTHERS (arg_info);
5888 if (current_scope->bindings)
5890 error ("%Jold-style parameter declarations in prototyped "
5891 "function definition", fndecl);
5893 /* Get rid of the old-style declarations. */
5897 /* Don't issue this warning for nested functions, and don't issue this
5898 warning if we got here because ARG_INFO_TYPES was error_mark_node
5899 (this happens when a function definition has just an ellipsis in
5900 its parameter list). */
5901 else if (warn_traditional && !in_system_header && !current_function_scope
5902 && ARG_INFO_TYPES (arg_info) != error_mark_node)
5903 warning ("%Jtraditional C rejects ISO C style function definitions",
5906 /* Now make all the parameter declarations visible in the function body.
5907 We can bypass most of the grunt work of pushdecl. */
5908 for (decl = parms; decl; decl = TREE_CHAIN (decl))
5910 DECL_CONTEXT (decl) = current_function_decl;
5911 if (DECL_NAME (decl))
5912 bind (DECL_NAME (decl), decl, current_scope,
5913 /*invisible=*/false, /*nested=*/false);
5915 error ("%Jparameter name omitted", decl);
5918 /* Record the parameter list in the function declaration. */
5919 DECL_ARGUMENTS (fndecl) = parms;
5921 /* Now make all the ancillary declarations visible, likewise. */
5922 for (decl = others; decl; decl = TREE_CHAIN (decl))
5924 DECL_CONTEXT (decl) = current_function_decl;
5925 if (DECL_NAME (decl))
5926 bind (DECL_NAME (decl), decl, current_scope,
5927 /*invisible=*/false, /*nested=*/false);
5930 /* And all the tag declarations. */
5931 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5932 if (TREE_PURPOSE (decl))
5933 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
5934 /*invisible=*/false, /*nested=*/false);
5937 /* Subroutine of store_parm_decls which handles old-style function
5938 definitions (separate parameter list and declarations). */
5941 store_parm_decls_oldstyle (tree fndecl, tree arg_info)
5943 struct c_binding *b;
5944 tree parm, decl, last;
5945 tree parmids = ARG_INFO_PARMS (arg_info);
5947 /* We use DECL_WEAK as a flag to show which parameters have been
5948 seen already, since it is not used on PARM_DECL. */
5949 #ifdef ENABLE_CHECKING
5950 for (b = current_scope->bindings; b; b = b->prev)
5951 if (TREE_CODE (b->decl) == PARM_DECL && DECL_WEAK (b->decl))
5955 if (warn_old_style_definition && !in_system_header)
5956 warning ("%Jold-style function definition", fndecl);
5958 /* Match each formal parameter name with its declaration. Save each
5959 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5960 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5962 if (TREE_VALUE (parm) == 0)
5964 error ("%Jparameter name missing from parameter list", fndecl);
5965 TREE_PURPOSE (parm) = 0;
5969 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
5970 if (b && B_IN_CURRENT_SCOPE (b))
5973 /* If we got something other than a PARM_DECL it is an error. */
5974 if (TREE_CODE (decl) != PARM_DECL)
5975 error ("%J'%D' declared as a non-parameter", decl, decl);
5976 /* If the declaration is already marked, we have a duplicate
5977 name. Complain and ignore the duplicate. */
5978 else if (DECL_WEAK (decl))
5980 error ("%Jmultiple parameters named '%D'", decl, decl);
5981 TREE_PURPOSE (parm) = 0;
5984 /* If the declaration says "void", complain and turn it into
5986 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5988 error ("%Jparameter '%D' declared with void type", decl, decl);
5989 TREE_TYPE (decl) = integer_type_node;
5990 DECL_ARG_TYPE (decl) = integer_type_node;
5991 layout_decl (decl, 0);
5994 /* If no declaration found, default to int. */
5997 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5998 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5999 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6003 pedwarn ("%Jtype of '%D' defaults to 'int'", decl, decl);
6004 else if (extra_warnings)
6005 warning ("%Jtype of '%D' defaults to 'int'", decl, decl);
6008 TREE_PURPOSE (parm) = decl;
6009 DECL_WEAK (decl) = 1;
6012 /* Now examine the parms chain for incomplete declarations
6013 and declarations with no corresponding names. */
6015 for (b = current_scope->bindings; b; b = b->prev)
6018 if (TREE_CODE (parm) != PARM_DECL)
6021 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6023 error ("%Jparameter '%D' has incomplete type", parm, parm);
6024 TREE_TYPE (parm) = error_mark_node;
6027 if (! DECL_WEAK (parm))
6029 error ("%Jdeclaration for parameter '%D' but no such parameter",
6032 /* Pretend the parameter was not missing.
6033 This gets us to a standard state and minimizes
6034 further error messages. */
6035 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6039 /* Chain the declarations together in the order of the list of
6040 names. Store that chain in the function decl, replacing the
6041 list of names. Update the current scope to match. */
6042 DECL_ARGUMENTS (fndecl) = 0;
6044 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6045 if (TREE_PURPOSE (parm))
6047 if (parm && TREE_PURPOSE (parm))
6049 last = TREE_PURPOSE (parm);
6050 DECL_ARGUMENTS (fndecl) = last;
6051 DECL_WEAK (last) = 0;
6053 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6054 if (TREE_PURPOSE (parm))
6056 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6057 last = TREE_PURPOSE (parm);
6058 DECL_WEAK (last) = 0;
6060 TREE_CHAIN (last) = 0;
6063 /* If there was a previous prototype,
6064 set the DECL_ARG_TYPE of each argument according to
6065 the type previously specified, and report any mismatches. */
6067 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6070 for (parm = DECL_ARGUMENTS (fndecl),
6071 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6072 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6073 != void_type_node));
6074 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6076 if (parm == 0 || type == 0
6077 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6079 error ("number of arguments doesn't match prototype");
6080 error ("%Hprototype declaration",
6081 ¤t_function_prototype_locus);
6084 /* Type for passing arg must be consistent with that
6085 declared for the arg. ISO C says we take the unqualified
6086 type for parameters declared with qualified type. */
6087 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6088 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6090 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6091 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6093 /* Adjust argument to match prototype. E.g. a previous
6094 `int foo(float);' prototype causes
6095 `int foo(x) float x; {...}' to be treated like
6096 `int foo(float x) {...}'. This is particularly
6097 useful for argument types like uid_t. */
6098 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6100 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6101 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6102 && TYPE_PRECISION (TREE_TYPE (parm))
6103 < TYPE_PRECISION (integer_type_node))
6104 DECL_ARG_TYPE (parm) = integer_type_node;
6108 pedwarn ("promoted argument '%D' "
6109 "doesn't match prototype", parm);
6110 pedwarn ("%Hprototype declaration",
6111 ¤t_function_prototype_locus);
6116 error ("argument '%D' doesn't match prototype", parm);
6117 error ("%Hprototype declaration",
6118 ¤t_function_prototype_locus);
6122 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6125 /* Otherwise, create a prototype that would match. */
6129 tree actual = 0, last = 0, type;
6131 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6133 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6135 TREE_CHAIN (last) = type;
6140 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6142 TREE_CHAIN (last) = type;
6146 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6147 of the type of this function, but we need to avoid having this
6148 affect the types of other similarly-typed functions, so we must
6149 first force the generation of an identical (but separate) type
6150 node for the relevant function type. The new node we create
6151 will be a variant of the main variant of the original function
6154 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6156 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6160 /* Store the parameter declarations into the current function declaration.
6161 This is called after parsing the parameter declarations, before
6162 digesting the body of the function.
6164 For an old-style definition, construct a prototype out of the old-style
6165 parameter declarations and inject it into the function's type. */
6168 store_parm_decls (void)
6170 tree fndecl = current_function_decl;
6172 /* The argument information block for FNDECL. */
6173 tree arg_info = DECL_ARGUMENTS (fndecl);
6175 /* True if this definition is written with a prototype. Note:
6176 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6177 list in a function definition as equivalent to (void) -- an
6178 empty argument list specifies the function has no parameters,
6179 but only (void) sets up a prototype for future calls. */
6180 bool proto = ARG_INFO_TYPES (arg_info) != 0;
6183 store_parm_decls_newstyle (fndecl, arg_info);
6185 store_parm_decls_oldstyle (fndecl, arg_info);
6187 /* The next call to push_scope will be a function body. */
6189 next_is_function_body = true;
6191 /* Write a record describing this function definition to the prototypes
6192 file (if requested). */
6194 gen_aux_info_record (fndecl, 1, 0, proto);
6196 /* Initialize the RTL code for the function. */
6197 allocate_struct_function (fndecl);
6199 /* Begin the statement tree for this function. */
6200 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6202 /* ??? Insert the contents of the pending sizes list into the function
6203 to be evaluated. This just changes mis-behaviour until assign_parms
6204 phase ordering problems are resolved. */
6207 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6208 add_stmt (TREE_VALUE (t));
6211 /* Even though we're inside a function body, we still don't want to
6212 call expand_expr to calculate the size of a variable-sized array.
6213 We haven't necessarily assigned RTL to all variables yet, so it's
6214 not safe to try to expand expressions involving them. */
6215 cfun->x_dont_save_pending_sizes_p = 1;
6218 /* Give FNDECL and all its nested functions to cgraph for compilation. */
6221 c_finalize (tree fndecl)
6223 struct cgraph_node *cgn;
6225 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6226 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6228 /* ??? Objc emits functions after finalizing the compilation unit.
6229 This should be cleaned up later and this conditional removed. */
6230 if (cgraph_global_info_ready)
6232 c_expand_body (fndecl);
6236 /* Finalize all nested functions now. */
6237 cgn = cgraph_node (fndecl);
6238 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6239 c_finalize (cgn->decl);
6241 cgraph_finalize_function (fndecl, false);
6244 /* Finish up a function declaration and compile that function
6245 all the way to assembler language output. The free the storage
6246 for the function definition.
6248 This is called after parsing the body of the function definition. */
6251 finish_function (void)
6253 tree fndecl = current_function_decl;
6255 if (TREE_CODE (fndecl) == FUNCTION_DECL
6256 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6258 tree args = DECL_ARGUMENTS (fndecl);
6259 for (; args; args = TREE_CHAIN (args))
6261 tree type = TREE_TYPE (args);
6262 if (INTEGRAL_TYPE_P (type)
6263 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6264 DECL_ARG_TYPE (args) = integer_type_node;
6268 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6269 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6271 /* Must mark the RESULT_DECL as being in this function. */
6273 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6274 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6276 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6278 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6279 != integer_type_node)
6281 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6282 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6284 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6289 c_finish_return (integer_zero_node);
6293 /* Tie off the statement tree for this function. */
6294 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6296 finish_fname_decls ();
6298 /* Complain if there's just no return statement. */
6299 if (warn_return_type
6300 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6301 && !current_function_returns_value && !current_function_returns_null
6302 /* Don't complain if we abort. */
6303 && !current_function_returns_abnormally
6304 /* Don't warn for main(). */
6305 && !MAIN_NAME_P (DECL_NAME (fndecl))
6306 /* Or if they didn't actually specify a return type. */
6307 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6308 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6309 inline function, as we might never be compiled separately. */
6310 && DECL_INLINE (fndecl))
6311 warning ("no return statement in function returning non-void");
6313 /* With just -Wextra, complain only if function returns both with
6314 and without a value. */
6316 && current_function_returns_value
6317 && current_function_returns_null)
6318 warning ("this function may return with or without a value");
6320 /* Store the end of the function, so that we get good line number
6321 info for the epilogue. */
6322 cfun->function_end_locus = input_location;
6324 /* If we don't have ctors/dtors sections, and this is a static
6325 constructor or destructor, it must be recorded now. */
6326 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6327 && !targetm.have_ctors_dtors)
6328 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6329 if (DECL_STATIC_DESTRUCTOR (fndecl)
6330 && !targetm.have_ctors_dtors)
6331 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6333 /* Genericize before inlining. Delay genericizing nested functions
6334 until their parent function is genericized. Since finalizing
6335 requires GENERIC, delay that as well. */
6337 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6339 if (!decl_function_context (fndecl))
6341 c_genericize (fndecl);
6342 lower_nested_functions (fndecl);
6343 c_finalize (fndecl);
6347 /* Register this function with cgraph just far enough to get it
6348 added to our parent's nested function list. Handy, since the
6349 C front end doesn't have such a list. */
6350 (void) cgraph_node (fndecl);
6354 /* We're leaving the context of this function, so zap cfun.
6355 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6356 tree_rest_of_compilation. */
6358 current_function_decl = NULL;
6361 /* Generate the RTL for the body of FNDECL. */
6364 c_expand_body (tree fndecl)
6367 if (!DECL_INITIAL (fndecl)
6368 || DECL_INITIAL (fndecl) == error_mark_node)
6371 tree_rest_of_compilation (fndecl, false);
6373 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6374 && targetm.have_ctors_dtors)
6375 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6376 DEFAULT_INIT_PRIORITY);
6377 if (DECL_STATIC_DESTRUCTOR (fndecl)
6378 && targetm.have_ctors_dtors)
6379 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6380 DEFAULT_INIT_PRIORITY);
6383 /* Check the declarations given in a for-loop for satisfying the C99
6386 check_for_loop_decls (void)
6388 struct c_binding *b;
6392 /* If we get here, declarations have been used in a for loop without
6393 the C99 for loop scope. This doesn't make much sense, so don't
6395 error ("'for' loop initial declaration used outside C99 mode");
6398 /* C99 subclause 6.8.5 paragraph 3:
6400 [#3] The declaration part of a for statement shall only
6401 declare identifiers for objects having storage class auto or
6404 It isn't clear whether, in this sentence, "identifiers" binds to
6405 "shall only declare" or to "objects" - that is, whether all identifiers
6406 declared must be identifiers for objects, or whether the restriction
6407 only applies to those that are. (A question on this in comp.std.c
6408 in November 2000 received no answer.) We implement the strictest
6409 interpretation, to avoid creating an extension which later causes
6412 for (b = current_scope->bindings; b; b = b->prev)
6415 tree decl = b->decl;
6420 switch (TREE_CODE (decl))
6423 if (TREE_STATIC (decl))
6424 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6425 "initial declaration", decl, decl);
6426 else if (DECL_EXTERNAL (decl))
6427 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6428 "initial declaration", decl, decl);
6432 error ("'struct %E' declared in 'for' loop initial declaration", id);
6435 error ("'union %E' declared in 'for' loop initial declaration", id);
6438 error ("'enum %E' declared in 'for' loop initial declaration", id);
6441 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6442 "initial declaration", decl, decl);
6447 /* Save and reinitialize the variables
6448 used during compilation of a C function. */
6451 c_push_function_context (struct function *f)
6453 struct language_function *p;
6454 p = ggc_alloc (sizeof (struct language_function));
6457 p->base.x_stmt_tree = c_stmt_tree;
6458 p->x_break_label = c_break_label;
6459 p->x_cont_label = c_cont_label;
6460 p->x_switch_stack = c_switch_stack;
6461 p->returns_value = current_function_returns_value;
6462 p->returns_null = current_function_returns_null;
6463 p->returns_abnormally = current_function_returns_abnormally;
6464 p->warn_about_return_type = warn_about_return_type;
6465 p->extern_inline = current_extern_inline;
6468 /* Restore the variables used during compilation of a C function. */
6471 c_pop_function_context (struct function *f)
6473 struct language_function *p = f->language;
6475 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6476 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6478 /* Stop pointing to the local nodes about to be freed. */
6479 /* But DECL_INITIAL must remain nonzero so we know this
6480 was an actual function definition. */
6481 DECL_INITIAL (current_function_decl) = error_mark_node;
6482 DECL_ARGUMENTS (current_function_decl) = 0;
6485 c_stmt_tree = p->base.x_stmt_tree;
6486 c_break_label = p->x_break_label;
6487 c_cont_label = p->x_cont_label;
6488 c_switch_stack = p->x_switch_stack;
6489 current_function_returns_value = p->returns_value;
6490 current_function_returns_null = p->returns_null;
6491 current_function_returns_abnormally = p->returns_abnormally;
6492 warn_about_return_type = p->warn_about_return_type;
6493 current_extern_inline = p->extern_inline;
6498 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6501 c_dup_lang_specific_decl (tree decl)
6503 struct lang_decl *ld;
6505 if (!DECL_LANG_SPECIFIC (decl))
6508 ld = ggc_alloc (sizeof (struct lang_decl));
6509 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6510 DECL_LANG_SPECIFIC (decl) = ld;
6513 /* The functions below are required for functionality of doing
6514 function at once processing in the C front end. Currently these
6515 functions are not called from anywhere in the C front end, but as
6516 these changes continue, that will change. */
6518 /* Returns nonzero if the current statement is a full expression,
6519 i.e. temporaries created during that statement should be destroyed
6520 at the end of the statement. */
6523 stmts_are_full_exprs_p (void)
6528 /* Returns the stmt_tree (if any) to which statements are currently
6529 being added. If there is no active statement-tree, NULL is
6533 current_stmt_tree (void)
6535 return &c_stmt_tree;
6538 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6542 anon_aggr_type_p (tree ARG_UNUSED (node))
6547 /* Dummy function in place of callback used by C++. */
6550 extract_interface_info (void)
6554 /* Return the global value of T as a symbol. */
6557 identifier_global_value (tree t)
6559 struct c_binding *b;
6561 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6562 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6568 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6569 otherwise the name is found in ridpointers from RID_INDEX. */
6572 record_builtin_type (enum rid rid_index, const char *name, tree type)
6576 id = ridpointers[(int) rid_index];
6578 id = get_identifier (name);
6579 pushdecl (build_decl (TYPE_DECL, id, type));
6582 /* Build the void_list_node (void_type_node having been created). */
6584 build_void_list_node (void)
6586 tree t = build_tree_list (NULL_TREE, void_type_node);
6590 /* Return something to represent absolute declarators containing a *.
6591 TARGET is the absolute declarator that the * contains.
6592 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6593 to apply to the pointer type, represented as identifiers, possible mixed
6596 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6597 if attributes are present) and whose type is the modifier list. */
6600 make_pointer_declarator (tree type_quals_attrs, tree target)
6603 tree itarget = target;
6604 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6605 if (attrs != NULL_TREE)
6606 itarget = tree_cons (attrs, target, NULL_TREE);
6607 return build1 (INDIRECT_REF, quals, itarget);
6610 /* Synthesize a function which calls all the global ctors or global
6611 dtors in this file. This is only used for targets which do not
6612 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
6614 build_cdtor (int method_type, tree cdtors)
6621 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
6622 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
6625 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
6628 /* Perform final processing on one file scope's declarations (or the
6629 external scope's declarations), GLOBALS. */
6631 c_write_global_declarations_1 (tree globals)
6633 size_t len = list_length (globals);
6634 tree *vec = xmalloc (sizeof (tree) * len);
6638 /* Process the decls in the order they were written. */
6639 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6642 wrapup_global_declarations (vec, len);
6643 check_global_declarations (vec, len);
6649 c_write_global_declarations (void)
6653 /* We don't want to do this if generating a PCH. */
6657 /* Don't waste time on further processing if -fsyntax-only or we've
6658 encountered errors. */
6659 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
6662 /* Close the external scope. */
6663 ext_block = pop_scope ();
6668 /* Process all file scopes in this compilation, and the external_scope,
6669 through wrapup_global_declarations and check_global_declarations. */
6670 for (t = all_translation_units; t; t = TREE_CHAIN (t))
6671 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
6672 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
6674 /* Generate functions to call static constructors and destructors
6675 for targets that do not support .ctors/.dtors sections. These
6676 functions have magic names which are detected by collect2. */
6677 build_cdtor ('I', static_ctors); static_ctors = 0;
6678 build_cdtor ('D', static_dtors); static_dtors = 0;
6680 /* We're done parsing; proceed to optimize and emit assembly.
6681 FIXME: shouldn't be the front end's responsibility to call this. */
6684 /* Presently this has to happen after cgraph_optimize.
6685 FIXME: shouldn't be the front end's responsibility to call this. */
6687 mudflap_finish_file ();
6690 #include "gt-c-decl.h"