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_NEW (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_CNEW (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 (!DECL_FILE_SCOPE_P (olddecl))
1330 error ("%Jextern declaration of %qD follows "
1331 "declaration with no linkage", newdecl, newdecl);
1332 locate_old_decl (olddecl, error);
1335 else if (warn_traditional)
1337 warning ("%Jnon-static declaration of '%D' follows "
1338 "static declaration", newdecl, newdecl);
1344 if (TREE_PUBLIC (newdecl))
1345 error ("%Jnon-static declaration of '%D' follows "
1346 "static declaration", newdecl, newdecl);
1348 error ("%Jstatic declaration of '%D' follows "
1349 "non-static declaration", newdecl, newdecl);
1351 locate_old_decl (olddecl, error);
1355 /* Two objects with the same name declared at the same block
1356 scope must both be external references (6.7p3). */
1357 else if (!DECL_FILE_SCOPE_P (newdecl))
1359 if (DECL_EXTERNAL (newdecl))
1361 else if (DECL_EXTERNAL (olddecl))
1362 error ("%Jdeclaration of '%D' with no linkage follows "
1363 "extern declaration", newdecl, newdecl);
1365 error ("%Jredeclaration of '%D' with no linkage",
1368 locate_old_decl (olddecl, error);
1374 /* All decls must agree on a visibility. */
1375 if (DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1376 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1378 warning ("%Jredeclaration of '%D' with different visibility "
1379 "(old visibility preserved)", newdecl, newdecl);
1383 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1385 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1386 if (DECL_DECLARED_INLINE_P (newdecl)
1387 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1389 warning ("%Jinline declaration of '%D' follows "
1390 "declaration with attribute noinline", newdecl, newdecl);
1393 else if (DECL_DECLARED_INLINE_P (olddecl)
1394 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1396 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1397 "inline declaration ", newdecl, newdecl);
1401 /* Inline declaration after use or definition.
1402 ??? Should we still warn about this now we have unit-at-a-time
1403 mode and can get it right?
1404 Definitely don't complain if the decls are in different translation
1406 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1407 && same_translation_unit_p (olddecl, newdecl))
1409 if (TREE_USED (olddecl))
1411 warning ("%J'%D' declared inline after being called",
1415 else if (DECL_INITIAL (olddecl))
1417 warning ("%J'%D' declared inline after its definition",
1423 else /* PARM_DECL, VAR_DECL */
1425 /* Redeclaration of a parameter is a constraint violation (this is
1426 not explicitly stated, but follows from C99 6.7p3 [no more than
1427 one declaration of the same identifier with no linkage in the
1428 same scope, except type tags] and 6.2.2p6 [parameters have no
1429 linkage]). We must check for a forward parameter declaration,
1430 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1431 an extension, the mandatory diagnostic for which is handled by
1432 mark_forward_parm_decls. */
1434 if (TREE_CODE (newdecl) == PARM_DECL
1435 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1437 error ("%Jredefinition of parameter '%D'", newdecl, newdecl);
1438 locate_old_decl (olddecl, error);
1443 /* Optional warning for completely redundant decls. */
1444 if (!warned && !pedwarned
1445 && warn_redundant_decls
1446 /* Don't warn about a function declaration followed by a
1448 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1449 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1450 /* Don't warn about redundant redeclarations of builtins. */
1451 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1452 && !DECL_BUILT_IN (newdecl)
1453 && DECL_BUILT_IN (olddecl)
1454 && !C_DECL_DECLARED_BUILTIN (olddecl))
1455 /* Don't warn about an extern followed by a definition. */
1456 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1457 /* Don't warn about forward parameter decls. */
1458 && !(TREE_CODE (newdecl) == PARM_DECL
1459 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1461 warning ("%Jredundant redeclaration of '%D'", newdecl, newdecl);
1465 /* Report location of previous decl/defn in a consistent manner. */
1466 if (warned || pedwarned)
1467 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1472 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1473 consistent with OLDDECL, but carries new information. Merge the
1474 new information into OLDDECL. This function issues no
1478 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1480 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1481 && DECL_INITIAL (newdecl) != 0);
1483 /* For real parm decl following a forward decl, rechain the old decl
1484 in its new location and clear TREE_ASM_WRITTEN (it's not a
1485 forward decl anymore). */
1486 if (TREE_CODE (newdecl) == PARM_DECL
1487 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1489 struct c_binding *b, **here;
1491 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1492 if ((*here)->decl == olddecl)
1499 b->prev = current_scope->bindings;
1500 current_scope->bindings = b;
1502 TREE_ASM_WRITTEN (olddecl) = 0;
1505 DECL_ATTRIBUTES (newdecl)
1506 = targetm.merge_decl_attributes (olddecl, newdecl);
1508 /* Merge the data types specified in the two decls. */
1510 = TREE_TYPE (olddecl)
1511 = composite_type (newtype, oldtype);
1513 /* Lay the type out, unless already done. */
1514 if (oldtype != TREE_TYPE (newdecl))
1516 if (TREE_TYPE (newdecl) != error_mark_node)
1517 layout_type (TREE_TYPE (newdecl));
1518 if (TREE_CODE (newdecl) != FUNCTION_DECL
1519 && TREE_CODE (newdecl) != TYPE_DECL
1520 && TREE_CODE (newdecl) != CONST_DECL)
1521 layout_decl (newdecl, 0);
1525 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1526 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1527 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1528 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1529 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1530 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1532 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1533 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1537 /* Keep the old rtl since we can safely use it. */
1538 COPY_DECL_RTL (olddecl, newdecl);
1540 /* Merge the type qualifiers. */
1541 if (TREE_READONLY (newdecl))
1542 TREE_READONLY (olddecl) = 1;
1544 if (TREE_THIS_VOLATILE (newdecl))
1546 TREE_THIS_VOLATILE (olddecl) = 1;
1547 if (TREE_CODE (newdecl) == VAR_DECL)
1548 make_var_volatile (newdecl);
1551 /* Keep source location of definition rather than declaration. */
1552 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1553 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1555 /* Merge the unused-warning information. */
1556 if (DECL_IN_SYSTEM_HEADER (olddecl))
1557 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1558 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1559 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1561 /* Merge the initialization information. */
1562 if (DECL_INITIAL (newdecl) == 0)
1563 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1565 /* Merge the section attribute.
1566 We want to issue an error if the sections conflict but that must be
1567 done later in decl_attributes since we are called before attributes
1569 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1570 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1572 /* Copy the assembler name.
1573 Currently, it can only be defined in the prototype. */
1574 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1576 /* Use visibility of whichever declaration had it specified */
1577 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1579 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1580 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1583 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1585 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1586 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1587 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1588 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1589 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1590 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1591 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1592 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1593 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1596 /* Merge the storage class information. */
1597 merge_weak (newdecl, olddecl);
1599 /* For functions, static overrides non-static. */
1600 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1602 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1603 /* This is since we don't automatically
1604 copy the attributes of NEWDECL into OLDDECL. */
1605 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1606 /* If this clears `static', clear it in the identifier too. */
1607 if (! TREE_PUBLIC (olddecl))
1608 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1610 if (DECL_EXTERNAL (newdecl))
1612 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1613 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1615 /* An extern decl does not override previous storage class. */
1616 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1617 if (! DECL_EXTERNAL (newdecl))
1619 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1620 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1625 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1626 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1629 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1631 /* If we're redefining a function previously defined as extern
1632 inline, make sure we emit debug info for the inline before we
1633 throw it away, in case it was inlined into a function that hasn't
1634 been written out yet. */
1635 if (new_is_definition && DECL_INITIAL (olddecl))
1637 if (TREE_USED (olddecl)
1638 /* In unit-at-a-time mode we never inline re-defined extern
1639 inline functions. */
1640 && !flag_unit_at_a_time
1641 && cgraph_function_possibly_inlined_p (olddecl))
1642 (*debug_hooks->outlining_inline_function) (olddecl);
1644 /* The new defn must not be inline. */
1645 DECL_INLINE (newdecl) = 0;
1646 DECL_UNINLINABLE (newdecl) = 1;
1650 /* If either decl says `inline', this fn is inline,
1651 unless its definition was passed already. */
1652 if (DECL_DECLARED_INLINE_P (newdecl)
1653 || DECL_DECLARED_INLINE_P (olddecl))
1654 DECL_DECLARED_INLINE_P (newdecl) = 1;
1656 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1657 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1660 if (DECL_BUILT_IN (olddecl))
1662 /* If redeclaring a builtin function, it stays built in.
1663 But it gets tagged as having been declared. */
1664 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1665 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1666 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1669 /* Also preserve various other info from the definition. */
1670 if (! new_is_definition)
1672 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1673 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1674 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1675 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1676 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1678 /* Set DECL_INLINE on the declaration if we've got a body
1679 from which to instantiate. */
1680 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1682 DECL_INLINE (newdecl) = 1;
1683 DECL_ABSTRACT_ORIGIN (newdecl)
1684 = DECL_ABSTRACT_ORIGIN (olddecl);
1689 /* If a previous declaration said inline, mark the
1690 definition as inlinable. */
1691 if (DECL_DECLARED_INLINE_P (newdecl)
1692 && ! DECL_UNINLINABLE (newdecl))
1693 DECL_INLINE (newdecl) = 1;
1697 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1698 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1700 unsigned olddecl_uid = DECL_UID (olddecl);
1701 tree olddecl_context = DECL_CONTEXT (olddecl);
1703 memcpy ((char *) olddecl + sizeof (struct tree_common),
1704 (char *) newdecl + sizeof (struct tree_common),
1705 sizeof (struct tree_decl) - sizeof (struct tree_common));
1706 DECL_UID (olddecl) = olddecl_uid;
1707 DECL_CONTEXT (olddecl) = olddecl_context;
1710 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1711 so that encode_section_info has a chance to look at the new decl
1712 flags and attributes. */
1713 if (DECL_RTL_SET_P (olddecl)
1714 && (TREE_CODE (olddecl) == FUNCTION_DECL
1715 || (TREE_CODE (olddecl) == VAR_DECL
1716 && TREE_STATIC (olddecl))))
1717 make_decl_rtl (olddecl);
1720 /* Handle when a new declaration NEWDECL has the same name as an old
1721 one OLDDECL in the same binding contour. Prints an error message
1724 If safely possible, alter OLDDECL to look like NEWDECL, and return
1725 true. Otherwise, return false. */
1728 duplicate_decls (tree newdecl, tree olddecl)
1730 tree newtype = NULL, oldtype = NULL;
1732 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1735 merge_decls (newdecl, olddecl, newtype, oldtype);
1740 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1742 warn_if_shadowing (tree new_decl)
1744 struct c_binding *b;
1746 /* Shadow warnings wanted? */
1748 /* No shadow warnings for internally generated vars. */
1749 || DECL_IS_BUILTIN (new_decl)
1750 /* No shadow warnings for vars made for inlining. */
1751 || DECL_FROM_INLINE (new_decl)
1752 /* Don't warn about the parm names in function declarator
1753 within a function declarator. It would be nice to avoid
1754 warning in any function declarator in a declaration, as
1755 opposed to a definition, but there is no way to tell
1756 it's not a definition at this point. */
1757 || (TREE_CODE (new_decl) == PARM_DECL && current_scope->outer->parm_flag))
1760 /* Is anything being shadowed? Invisible decls do not count. */
1761 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1762 if (b->decl && b->decl != new_decl && !b->invisible)
1764 tree old_decl = b->decl;
1766 if (TREE_CODE (old_decl) == PARM_DECL)
1767 warning ("%Jdeclaration of '%D' shadows a parameter",
1768 new_decl, new_decl);
1769 else if (DECL_FILE_SCOPE_P (old_decl))
1770 warning ("%Jdeclaration of '%D' shadows a global declaration",
1771 new_decl, new_decl);
1772 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1773 && DECL_BUILT_IN (old_decl))
1774 warning ("%Jdeclaration of '%D' shadows a built-in function",
1775 new_decl, new_decl);
1777 warning ("%Jdeclaration of '%D' shadows a previous local",
1778 new_decl, new_decl);
1780 if (TREE_CODE (old_decl) != FUNCTION_DECL
1781 || ! DECL_BUILT_IN (old_decl))
1782 warning ("%Jshadowed declaration is here", old_decl);
1789 /* Subroutine of pushdecl.
1791 X is a TYPE_DECL for a typedef statement. Create a brand new
1792 ..._TYPE node (which will be just a variant of the existing
1793 ..._TYPE node with identical properties) and then install X
1794 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1796 The whole point here is to end up with a situation where each
1797 and every ..._TYPE node the compiler creates will be uniquely
1798 associated with AT MOST one node representing a typedef name.
1799 This way, even though the compiler substitutes corresponding
1800 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1801 early on, later parts of the compiler can always do the reverse
1802 translation and get back the corresponding typedef name. For
1805 typedef struct S MY_TYPE;
1808 Later parts of the compiler might only know that `object' was of
1809 type `struct S' if it were not for code just below. With this
1810 code however, later parts of the compiler see something like:
1812 struct S' == struct S
1813 typedef struct S' MY_TYPE;
1816 And they can then deduce (from the node for type struct S') that
1817 the original object declaration was:
1821 Being able to do this is important for proper support of protoize,
1822 and also for generating precise symbolic debugging information
1823 which takes full account of the programmer's (typedef) vocabulary.
1825 Obviously, we don't want to generate a duplicate ..._TYPE node if
1826 the TYPE_DECL node that we are now processing really represents a
1827 standard built-in type.
1829 Since all standard types are effectively declared at line zero
1830 in the source file, we can easily check to see if we are working
1831 on a standard type by checking the current value of lineno. */
1834 clone_underlying_type (tree x)
1836 if (DECL_IS_BUILTIN (x))
1838 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1839 TYPE_NAME (TREE_TYPE (x)) = x;
1841 else if (TREE_TYPE (x) != error_mark_node
1842 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1844 tree tt = TREE_TYPE (x);
1845 DECL_ORIGINAL_TYPE (x) = tt;
1846 tt = build_type_copy (tt);
1848 TREE_USED (tt) = TREE_USED (x);
1853 /* Record a decl-node X as belonging to the current lexical scope.
1854 Check for errors (such as an incompatible declaration for the same
1855 name already seen in the same scope).
1857 Returns either X or an old decl for the same name.
1858 If an old decl is returned, it may have been smashed
1859 to agree with what X says. */
1864 tree name = DECL_NAME (x);
1865 struct c_scope *scope = current_scope;
1866 struct c_binding *b;
1867 bool nested = false;
1869 /* Functions need the lang_decl data. */
1870 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1871 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
1873 /* Must set DECL_CONTEXT for everything not at file scope or
1874 DECL_FILE_SCOPE_P won't work. Local externs don't count
1875 unless they have initializers (which generate code). */
1876 if (current_function_decl
1877 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
1878 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
1879 DECL_CONTEXT (x) = current_function_decl;
1881 /* Anonymous decls are just inserted in the scope. */
1884 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
1888 /* First, see if there is another declaration with the same name in
1889 the current scope. If there is, duplicate_decls may do all the
1890 work for us. If duplicate_decls returns false, that indicates
1891 two incompatible decls in the same scope; we are to silently
1892 replace the old one (duplicate_decls has issued all appropriate
1893 diagnostics). In particular, we should not consider possible
1894 duplicates in the external scope, or shadowing. */
1895 b = I_SYMBOL_BINDING (name);
1896 if (b && B_IN_SCOPE (b, scope))
1898 if (duplicate_decls (x, b->decl))
1901 goto skip_external_and_shadow_checks;
1904 /* All declarations with external linkage, and all external
1905 references, go in the external scope, no matter what scope is
1906 current. However, the binding in that scope is ignored for
1907 purposes of normal name lookup. A separate binding structure is
1908 created in the requested scope; this governs the normal
1909 visibility of the symbol.
1911 The binding in the externals scope is used exclusively for
1912 detecting duplicate declarations of the same object, no matter
1913 what scope they are in; this is what we do here. (C99 6.2.7p2:
1914 All declarations that refer to the same object or function shall
1915 have compatible type; otherwise, the behavior is undefined.) */
1916 if (DECL_EXTERNAL (x) || scope == file_scope)
1918 if (warn_nested_externs
1919 && scope != file_scope
1920 && !DECL_IN_SYSTEM_HEADER (x))
1921 warning ("nested extern declaration of '%D'", x);
1923 while (b && !B_IN_EXTERNAL_SCOPE (b))
1926 /* The point of the same_translation_unit_p check here is,
1927 we want to detect a duplicate decl for a construct like
1928 foo() { extern bar(); } ... static bar(); but not if
1929 they are in different translation units. In any case,
1930 the static does not go in the externals scope. */
1932 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
1933 && duplicate_decls (x, b->decl))
1935 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
1938 else if (TREE_PUBLIC (x))
1940 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
1944 /* Similarly, a declaration of a function with static linkage at
1945 block scope must be checked against any existing declaration
1946 of that function at file scope. */
1947 else if (TREE_CODE (x) == FUNCTION_DECL && scope != file_scope
1948 && !TREE_PUBLIC (x) && !DECL_INITIAL (x))
1950 if (warn_nested_externs && !DECL_IN_SYSTEM_HEADER (x))
1951 warning ("nested static declaration of '%D'", x);
1953 while (b && !B_IN_FILE_SCOPE (b))
1956 if (b && same_translation_unit_p (x, b->decl)
1957 && duplicate_decls (x, b->decl))
1959 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
1964 bind (name, x, file_scope, /*invisible=*/true, /*nested=*/false);
1969 warn_if_shadowing (x);
1971 skip_external_and_shadow_checks:
1972 if (TREE_CODE (x) == TYPE_DECL)
1973 clone_underlying_type (x);
1975 bind (name, x, scope, /*invisible=*/false, nested);
1977 /* If x's type is incomplete because it's based on a
1978 structure or union which has not yet been fully declared,
1979 attach it to that structure or union type, so we can go
1980 back and complete the variable declaration later, if the
1981 structure or union gets fully declared.
1983 If the input is erroneous, we can have error_mark in the type
1984 slot (e.g. "f(void a, ...)") - that doesn't count as an
1986 if (TREE_TYPE (x) != error_mark_node
1987 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1989 tree element = TREE_TYPE (x);
1991 while (TREE_CODE (element) == ARRAY_TYPE)
1992 element = TREE_TYPE (element);
1993 element = TYPE_MAIN_VARIANT (element);
1995 if ((TREE_CODE (element) == RECORD_TYPE
1996 || TREE_CODE (element) == UNION_TYPE)
1997 && (TREE_CODE (x) != TYPE_DECL
1998 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
1999 && !COMPLETE_TYPE_P (element))
2000 C_TYPE_INCOMPLETE_VARS (element)
2001 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2006 /* Record X as belonging to file scope.
2007 This is used only internally by the Objective-C front end,
2008 and is limited to its needs. duplicate_decls is not called;
2009 if there is any preexisting decl for this identifier, it is an ICE. */
2012 pushdecl_top_level (tree x)
2015 bool nested = false;
2017 if (TREE_CODE (x) != VAR_DECL)
2020 name = DECL_NAME (x);
2022 if (I_SYMBOL_BINDING (name))
2025 if (TREE_PUBLIC (x))
2027 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2031 bind (name, x, file_scope, /*invisible=*/false, nested);
2037 implicit_decl_warning (tree id, tree olddecl)
2039 void (*diag) (const char *, ...);
2040 switch (mesg_implicit_function_declaration)
2043 case 1: diag = warning; break;
2044 case 2: diag = error; break;
2048 diag (N_("implicit declaration of function '%E'"), id);
2050 locate_old_decl (olddecl, diag);
2053 /* Generate an implicit declaration for identifier FUNCTIONID as a
2054 function of type int (). */
2057 implicitly_declare (tree functionid)
2059 tree decl = lookup_name_in_scope (functionid, external_scope);
2063 /* FIXME: Objective-C has weird not-really-builtin functions
2064 which are supposed to be visible automatically. They wind up
2065 in the external scope because they're pushed before the file
2066 scope gets created. Catch this here and rebind them into the
2068 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2070 bind (functionid, decl, file_scope,
2071 /*invisible=*/false, /*nested=*/true);
2076 /* Implicit declaration of a function already declared
2077 (somehow) in a different scope, or as a built-in.
2078 If this is the first time this has happened, warn;
2079 then recycle the old declaration. */
2080 if (!C_DECL_IMPLICIT (decl))
2082 implicit_decl_warning (functionid, decl);
2083 C_DECL_IMPLICIT (decl) = 1;
2085 if (DECL_BUILT_IN (decl))
2087 if (!comptypes (default_function_type, TREE_TYPE (decl)))
2089 warning ("incompatible implicit declaration of built-in"
2090 " function %qD", decl);
2095 if (!comptypes (default_function_type, TREE_TYPE (decl)))
2097 error ("incompatible implicit declaration of function %qD",
2099 locate_old_decl (decl, error);
2102 bind (functionid, decl, current_scope,
2103 /*invisible=*/false, /*nested=*/true);
2108 /* Not seen before. */
2109 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2110 DECL_EXTERNAL (decl) = 1;
2111 TREE_PUBLIC (decl) = 1;
2112 C_DECL_IMPLICIT (decl) = 1;
2113 implicit_decl_warning (functionid, 0);
2115 /* C89 says implicit declarations are in the innermost block.
2116 So we record the decl in the standard fashion. */
2117 decl = pushdecl (decl);
2119 /* No need to call objc_check_decl here - it's a function type. */
2120 rest_of_decl_compilation (decl, 0, 0);
2122 /* Write a record describing this implicit function declaration
2123 to the prototypes file (if requested). */
2124 gen_aux_info_record (decl, 0, 1, 0);
2126 /* Possibly apply some default attributes to this implicit declaration. */
2127 decl_attributes (&decl, NULL_TREE, 0);
2132 /* Issue an error message for a reference to an undeclared variable
2133 ID, including a reference to a builtin outside of function-call
2134 context. Establish a binding of the identifier to error_mark_node
2135 in an appropriate scope, which will suppress further errors for the
2138 undeclared_variable (tree id)
2140 static bool already = false;
2141 struct c_scope *scope;
2143 if (current_function_decl == 0)
2145 error ("'%E' undeclared here (not in a function)", id);
2146 scope = current_scope;
2150 error ("'%E' undeclared (first use in this function)", id);
2154 error ("(Each undeclared identifier is reported only once");
2155 error ("for each function it appears in.)");
2159 /* If we are parsing old-style parameter decls, current_function_decl
2160 will be nonnull but current_function_scope will be null. */
2161 scope = current_function_scope ? current_function_scope : current_scope;
2163 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2166 /* Subroutine of lookup_label, declare_label, define_label: construct a
2167 LABEL_DECL with all the proper frills. */
2170 make_label (tree name, location_t location)
2172 tree label = build_decl (LABEL_DECL, name, void_type_node);
2174 DECL_CONTEXT (label) = current_function_decl;
2175 DECL_MODE (label) = VOIDmode;
2176 DECL_SOURCE_LOCATION (label) = location;
2181 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2182 Create one if none exists so far for the current function.
2183 This is called when a label is used in a goto expression or
2184 has its address taken. */
2187 lookup_label (tree name)
2191 if (current_function_decl == 0)
2193 error ("label %s referenced outside of any function",
2194 IDENTIFIER_POINTER (name));
2198 /* Use a label already defined or ref'd with this name, but not if
2199 it is inherited from a containing function and wasn't declared
2201 label = I_LABEL_DECL (name);
2202 if (label && (DECL_CONTEXT (label) == current_function_decl
2203 || C_DECLARED_LABEL_FLAG (label)))
2205 /* If the label has only been declared, update its apparent
2206 location to point here, for better diagnostics if it
2207 turns out not to have been defined. */
2208 if (!TREE_USED (label))
2209 DECL_SOURCE_LOCATION (label) = input_location;
2213 /* No label binding for that identifier; make one. */
2214 label = make_label (name, input_location);
2216 /* Ordinary labels go in the current function scope. */
2217 bind (name, label, current_function_scope,
2218 /*invisible=*/false, /*nested=*/false);
2222 /* Make a label named NAME in the current function, shadowing silently
2223 any that may be inherited from containing functions or containing
2224 scopes. This is called for __label__ declarations. */
2227 declare_label (tree name)
2229 struct c_binding *b = I_LABEL_BINDING (name);
2232 /* Check to make sure that the label hasn't already been declared
2234 if (b && B_IN_CURRENT_SCOPE (b))
2236 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2237 locate_old_decl (b->decl, error);
2239 /* Just use the previous declaration. */
2243 label = make_label (name, input_location);
2244 C_DECLARED_LABEL_FLAG (label) = 1;
2246 /* Declared labels go in the current scope. */
2247 bind (name, label, current_scope,
2248 /*invisible=*/false, /*nested=*/false);
2252 /* Define a label, specifying the location in the source file.
2253 Return the LABEL_DECL node for the label, if the definition is valid.
2254 Otherwise return 0. */
2257 define_label (location_t location, tree name)
2259 /* Find any preexisting label with this name. It is an error
2260 if that label has already been defined in this function, or
2261 if there is a containing function with a declared label with
2263 tree label = I_LABEL_DECL (name);
2266 && ((DECL_CONTEXT (label) == current_function_decl
2267 && DECL_INITIAL (label) != 0)
2268 || (DECL_CONTEXT (label) != current_function_decl
2269 && C_DECLARED_LABEL_FLAG (label))))
2271 error ("%Hduplicate label `%D'", &location, label);
2272 locate_old_decl (label, error);
2275 else if (label && DECL_CONTEXT (label) == current_function_decl)
2277 /* The label has been used or declared already in this function,
2278 but not defined. Update its location to point to this
2280 DECL_SOURCE_LOCATION (label) = location;
2284 /* No label binding for that identifier; make one. */
2285 label = make_label (name, location);
2287 /* Ordinary labels go in the current function scope. */
2288 bind (name, label, current_function_scope,
2289 /*invisible=*/false, /*nested=*/false);
2292 if (warn_traditional && !in_system_header && lookup_name (name))
2293 warning ("%Htraditional C lacks a separate namespace for labels, "
2294 "identifier `%s' conflicts", &location,
2295 IDENTIFIER_POINTER (name));
2297 /* Mark label as having been defined. */
2298 DECL_INITIAL (label) = error_mark_node;
2302 /* Given NAME, an IDENTIFIER_NODE,
2303 return the structure (or union or enum) definition for that name.
2304 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2305 CODE says which kind of type the caller wants;
2306 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2307 If the wrong kind of type is found, an error is reported. */
2310 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2312 struct c_binding *b = I_TAG_BINDING (name);
2318 /* We only care about whether it's in this level if
2319 thislevel_only was set or it might be a type clash. */
2320 if (thislevel_only || TREE_CODE (b->decl) != code)
2322 /* For our purposes, a tag in the external scope is the same as
2323 a tag in the file scope. (Primarily relevant to Objective-C
2324 and its builtin structure tags, which get pushed before the
2325 file scope is created.) */
2326 if (B_IN_CURRENT_SCOPE (b)
2327 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2331 if (thislevel_only && !thislevel)
2334 if (TREE_CODE (b->decl) != code)
2336 /* Definition isn't the kind we were looking for. */
2337 pending_invalid_xref = name;
2338 pending_invalid_xref_location = input_location;
2340 /* If in the same binding level as a declaration as a tag
2341 of a different type, this must not be allowed to
2342 shadow that tag, so give the error immediately.
2343 (For example, "struct foo; union foo;" is invalid.) */
2345 pending_xref_error ();
2350 /* Print an error message now
2351 for a recent invalid struct, union or enum cross reference.
2352 We don't print them immediately because they are not invalid
2353 when used in the `struct foo;' construct for shadowing. */
2356 pending_xref_error (void)
2358 if (pending_invalid_xref != 0)
2359 error ("%H`%s' defined as wrong kind of tag",
2360 &pending_invalid_xref_location,
2361 IDENTIFIER_POINTER (pending_invalid_xref));
2362 pending_invalid_xref = 0;
2366 /* Look up NAME in the current scope and its superiors
2367 in the namespace of variables, functions and typedefs.
2368 Return a ..._DECL node of some kind representing its definition,
2369 or return 0 if it is undefined. */
2372 lookup_name (tree name)
2374 struct c_binding *b = I_SYMBOL_BINDING (name);
2375 if (b && !b->invisible)
2380 /* Similar to `lookup_name' but look only at the indicated scope. */
2383 lookup_name_in_scope (tree name, struct c_scope *scope)
2385 struct c_binding *b;
2387 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2388 if (B_IN_SCOPE (b, scope))
2393 /* Create the predefined scalar types of C,
2394 and some nodes representing standard constants (0, 1, (void *) 0).
2395 Initialize the global scope.
2396 Make definitions for built-in primitive functions. */
2399 c_init_decl_processing (void)
2402 tree ptr_ftype_void, ptr_ftype_ptr;
2403 location_t save_loc = input_location;
2405 /* Adds some ggc roots, and reserved words for c-parse.in. */
2408 current_function_decl = 0;
2410 /* Make the externals scope. */
2412 external_scope = current_scope;
2414 /* Declarations from c_common_nodes_and_builtins must not be associated
2415 with this input file, lest we get differences between using and not
2416 using preprocessed headers. */
2417 #ifdef USE_MAPPED_LOCATION
2418 input_location = BUILTINS_LOCATION;
2420 input_location.file = "<built-in>";
2421 input_location.line = 0;
2424 build_common_tree_nodes (flag_signed_char);
2426 c_common_nodes_and_builtins ();
2428 /* In C, comparisons and TRUTH_* expressions have type int. */
2429 truthvalue_type_node = integer_type_node;
2430 truthvalue_true_node = integer_one_node;
2431 truthvalue_false_node = integer_zero_node;
2433 /* Even in C99, which has a real boolean type. */
2434 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2435 boolean_type_node));
2437 endlink = void_list_node;
2438 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2440 = build_function_type (ptr_type_node,
2441 tree_cons (NULL_TREE, ptr_type_node, endlink));
2443 input_location = save_loc;
2445 pedantic_lvalues = true;
2447 make_fname_decl = c_make_fname_decl;
2448 start_fname_decls ();
2451 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2452 decl, NAME is the initialization string and TYPE_DEP indicates whether
2453 NAME depended on the type of the function. As we don't yet implement
2454 delayed emission of static data, we mark the decl as emitted
2455 so it is not placed in the output. Anything using it must therefore pull
2456 out the STRING_CST initializer directly. FIXME. */
2459 c_make_fname_decl (tree id, int type_dep)
2461 const char *name = fname_as_string (type_dep);
2462 tree decl, type, init;
2463 size_t length = strlen (name);
2465 type = build_array_type
2466 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2467 build_index_type (size_int (length)));
2469 decl = build_decl (VAR_DECL, id, type);
2471 TREE_STATIC (decl) = 1;
2472 TREE_READONLY (decl) = 1;
2473 DECL_ARTIFICIAL (decl) = 1;
2475 init = build_string (length + 1, name);
2476 free ((char *) name);
2477 TREE_TYPE (init) = type;
2478 DECL_INITIAL (decl) = init;
2480 TREE_USED (decl) = 1;
2482 if (current_function_decl)
2484 DECL_CONTEXT (decl) = current_function_decl;
2485 bind (id, decl, current_function_scope,
2486 /*invisible=*/false, /*nested=*/false);
2489 finish_decl (decl, init, NULL_TREE);
2494 /* Return a definition for a builtin function named NAME and whose data type
2495 is TYPE. TYPE should be a function type with argument types.
2496 FUNCTION_CODE tells later passes how to compile calls to this function.
2497 See tree.h for its possible values.
2499 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2500 the name to be called if we can't opencode the function. If
2501 ATTRS is nonzero, use that for the function's attribute list. */
2504 builtin_function (const char *name, tree type, int function_code,
2505 enum built_in_class cl, const char *library_name,
2508 tree id = get_identifier (name);
2509 tree decl = build_decl (FUNCTION_DECL, id, type);
2510 TREE_PUBLIC (decl) = 1;
2511 DECL_EXTERNAL (decl) = 1;
2512 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2513 DECL_BUILT_IN_CLASS (decl) = cl;
2514 DECL_FUNCTION_CODE (decl) = function_code;
2516 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2518 /* Should never be called on a symbol with a preexisting meaning. */
2519 if (I_SYMBOL_BINDING (id))
2522 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2524 /* Builtins in the implementation namespace are made visible without
2525 needing to be explicitly declared. See push_file_scope. */
2526 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2528 TREE_CHAIN (decl) = visible_builtins;
2529 visible_builtins = decl;
2532 /* Possibly apply some default attributes to this built-in function. */
2534 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2536 decl_attributes (&decl, NULL_TREE, 0);
2541 /* Called when a declaration is seen that contains no names to declare.
2542 If its type is a reference to a structure, union or enum inherited
2543 from a containing scope, shadow that tag name for the current scope
2544 with a forward reference.
2545 If its type defines a new named structure or union
2546 or defines an enum, it is valid but we need not do anything here.
2547 Otherwise, it is an error. */
2550 shadow_tag (tree declspecs)
2552 shadow_tag_warned (declspecs, 0);
2555 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2558 shadow_tag_warned (tree declspecs, int warned)
2564 pending_invalid_xref = 0;
2566 /* Remove the attributes from declspecs, since they will confuse the
2568 split_specs_attrs (declspecs, &specs, &attrs);
2570 for (link = specs; link; link = TREE_CHAIN (link))
2572 tree value = TREE_VALUE (link);
2573 enum tree_code code = TREE_CODE (value);
2575 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2576 /* Used to test also that TYPE_SIZE (value) != 0.
2577 That caused warning for `struct foo;' at top level in the file. */
2579 tree name = TYPE_NAME (value);
2586 if (warned != 1 && code != ENUMERAL_TYPE)
2587 /* Empty unnamed enum OK */
2589 pedwarn ("unnamed struct/union that defines no instances");
2595 t = lookup_tag (code, name, 1);
2599 t = make_node (code);
2606 if (!warned && ! in_system_header)
2608 warning ("useless keyword or type name in empty declaration");
2615 error ("two types specified in one empty declaration");
2620 pedwarn ("empty declaration");
2624 /* Construct an array declarator. EXPR is the expression inside [], or
2625 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2626 to the pointer to which a parameter array is converted). STATIC_P is
2627 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2628 is nonzero is the array is [*], a VLA of unspecified length which is
2629 nevertheless a complete type (not currently implemented by GCC),
2630 zero otherwise. The declarator is constructed as an ARRAY_REF
2631 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2632 left of the [] (filled by in set_array_declarator_type) and operand 1
2633 is the expression inside; whose TREE_TYPE is the type qualifiers and
2634 which has TREE_STATIC set if "static" is used. */
2637 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2640 decl = build_nt (ARRAY_REF, NULL_TREE, expr, NULL_TREE, NULL_TREE);
2641 TREE_TYPE (decl) = quals;
2642 TREE_STATIC (decl) = (static_p ? 1 : 0);
2643 if (pedantic && !flag_isoc99)
2645 if (static_p || quals != NULL_TREE)
2646 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2648 pedwarn ("ISO C90 does not support `[*]' array declarators");
2651 warning ("GCC does not yet properly implement `[*]' array declarators");
2655 /* Set the type of an array declarator. DECL is the declarator, as
2656 constructed by build_array_declarator; TYPE is what appears on the left
2657 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2658 abstract declarator, zero otherwise; this is used to reject static and
2659 type qualifiers in abstract declarators, where they are not in the
2663 set_array_declarator_type (tree decl, tree type, int abstract_p)
2665 TREE_OPERAND (decl, 0) = type;
2666 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2667 error ("static or type qualifiers in abstract declarator");
2671 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2674 groktypename (tree type_name)
2678 if (TREE_CODE (type_name) != TREE_LIST)
2681 split_specs_attrs (TREE_PURPOSE (type_name), &specs, &attrs);
2683 type_name = grokdeclarator (TREE_VALUE (type_name), specs, TYPENAME, 0,
2686 /* Apply attributes. */
2687 decl_attributes (&type_name, attrs, 0);
2692 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2695 groktypename_in_parm_context (tree type_name)
2697 if (TREE_CODE (type_name) != TREE_LIST)
2699 return grokdeclarator (TREE_VALUE (type_name),
2700 TREE_PURPOSE (type_name),
2704 /* Decode a declarator in an ordinary declaration or data definition.
2705 This is called as soon as the type information and variable name
2706 have been parsed, before parsing the initializer if any.
2707 Here we create the ..._DECL node, fill in its type,
2708 and put it on the list of decls for the current context.
2709 The ..._DECL node is returned as the value.
2711 Exception: for arrays where the length is not specified,
2712 the type is left null, to be filled in by `finish_decl'.
2714 Function definitions do not come here; they go to start_function
2715 instead. However, external and forward declarations of functions
2716 do go through here. Structure field declarations are done by
2717 grokfield and not through here. */
2720 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2725 /* An object declared as __attribute__((deprecated)) suppresses
2726 warnings of uses of other deprecated items. */
2727 if (lookup_attribute ("deprecated", attributes))
2728 deprecated_state = DEPRECATED_SUPPRESS;
2730 decl = grokdeclarator (declarator, declspecs,
2731 NORMAL, initialized, NULL);
2733 deprecated_state = DEPRECATED_NORMAL;
2735 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2736 && MAIN_NAME_P (DECL_NAME (decl)))
2737 warning ("%J'%D' is usually a function", decl, decl);
2740 /* Is it valid for this decl to have an initializer at all?
2741 If not, set INITIALIZED to zero, which will indirectly
2742 tell 'finish_decl' to ignore the initializer once it is parsed. */
2743 switch (TREE_CODE (decl))
2746 error ("typedef '%D' is initialized (use __typeof__ instead)", decl);
2751 error ("function '%D' is initialized like a variable", decl);
2756 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2757 error ("parameter '%D' is initialized", decl);
2762 /* Don't allow initializations for incomplete types except for
2763 arrays which might be completed by the initialization. */
2765 /* This can happen if the array size is an undefined macro.
2766 We already gave a warning, so we don't need another one. */
2767 if (TREE_TYPE (decl) == error_mark_node)
2769 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2771 /* A complete type is ok if size is fixed. */
2773 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2774 || C_DECL_VARIABLE_SIZE (decl))
2776 error ("variable-sized object may not be initialized");
2780 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2782 error ("variable '%D' has initializer but incomplete type", decl);
2785 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2787 error ("elements of array '%D' have incomplete type", decl);
2794 if (current_scope == file_scope)
2795 TREE_STATIC (decl) = 1;
2797 /* Tell 'pushdecl' this is an initialized decl
2798 even though we don't yet have the initializer expression.
2799 Also tell 'finish_decl' it may store the real initializer. */
2800 DECL_INITIAL (decl) = error_mark_node;
2803 /* If this is a function declaration, write a record describing it to the
2804 prototypes file (if requested). */
2806 if (TREE_CODE (decl) == FUNCTION_DECL)
2807 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2809 /* ANSI specifies that a tentative definition which is not merged with
2810 a non-tentative definition behaves exactly like a definition with an
2811 initializer equal to zero. (Section 3.7.2)
2813 -fno-common gives strict ANSI behavior, though this tends to break
2814 a large body of code that grew up without this rule.
2816 Thread-local variables are never common, since there's no entrenched
2817 body of code to break, and it allows more efficient variable references
2818 in the presence of dynamic linking. */
2820 if (TREE_CODE (decl) == VAR_DECL
2822 && TREE_PUBLIC (decl)
2823 && !DECL_THREAD_LOCAL (decl)
2825 DECL_COMMON (decl) = 1;
2827 /* Set attributes here so if duplicate decl, will have proper attributes. */
2828 decl_attributes (&decl, attributes, 0);
2830 if (TREE_CODE (decl) == FUNCTION_DECL
2831 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2833 tree ce = declarator;
2835 if (TREE_CODE (ce) == INDIRECT_REF)
2836 ce = TREE_OPERAND (declarator, 0);
2837 if (TREE_CODE (ce) == CALL_EXPR)
2839 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2840 for (; args; args = TREE_CHAIN (args))
2842 tree type = TREE_TYPE (args);
2843 if (type && INTEGRAL_TYPE_P (type)
2844 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2845 DECL_ARG_TYPE (args) = integer_type_node;
2850 if (TREE_CODE (decl) == FUNCTION_DECL
2851 && DECL_DECLARED_INLINE_P (decl)
2852 && DECL_UNINLINABLE (decl)
2853 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2854 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2856 /* Add this decl to the current scope.
2857 TEM may equal DECL or it may be a previous decl of the same name. */
2858 tem = pushdecl (decl);
2861 DECL_EXTERNAL (tem) = 0;
2866 /* Finish processing of a declaration;
2867 install its initial value.
2868 If the length of an array type is not known before,
2869 it must be determined now, from the initial value, or it is an error. */
2872 finish_decl (tree decl, tree init, tree asmspec_tree)
2874 tree type = TREE_TYPE (decl);
2875 int was_incomplete = (DECL_SIZE (decl) == 0);
2876 const char *asmspec = 0;
2878 /* If a name was specified, get the string. */
2879 if (current_scope == file_scope)
2880 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2882 asmspec = TREE_STRING_POINTER (asmspec_tree);
2884 /* If `start_decl' didn't like having an initialization, ignore it now. */
2885 if (init != 0 && DECL_INITIAL (decl) == 0)
2888 /* Don't crash if parm is initialized. */
2889 if (TREE_CODE (decl) == PARM_DECL)
2893 store_init_value (decl, init);
2895 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2896 || TREE_CODE (decl) == FUNCTION_DECL
2897 || TREE_CODE (decl) == FIELD_DECL))
2898 objc_check_decl (decl);
2900 /* Deduce size of array from initialization, if not already known. */
2901 if (TREE_CODE (type) == ARRAY_TYPE
2902 && TYPE_DOMAIN (type) == 0
2903 && TREE_CODE (decl) != TYPE_DECL)
2906 = (TREE_STATIC (decl)
2907 /* Even if pedantic, an external linkage array
2908 may have incomplete type at first. */
2909 ? pedantic && !TREE_PUBLIC (decl)
2910 : !DECL_EXTERNAL (decl));
2912 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2914 /* Get the completed type made by complete_array_type. */
2915 type = TREE_TYPE (decl);
2918 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2920 else if (failure == 2)
2923 error ("%Jarray size missing in '%D'", decl, decl);
2924 /* If a `static' var's size isn't known,
2925 make it extern as well as static, so it does not get
2927 If it is not `static', then do not mark extern;
2928 finish_incomplete_decl will give it a default size
2929 and it will get allocated. */
2930 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2931 DECL_EXTERNAL (decl) = 1;
2934 /* TYPE_MAX_VALUE is always one less than the number of elements
2935 in the array, because we start counting at zero. Therefore,
2936 warn only if the value is less than zero. */
2937 else if (pedantic && TYPE_DOMAIN (type) != 0
2938 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2939 error ("%Jzero or negative size array '%D'", decl, decl);
2941 layout_decl (decl, 0);
2944 if (TREE_CODE (decl) == VAR_DECL)
2946 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2947 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2948 layout_decl (decl, 0);
2950 if (DECL_SIZE (decl) == 0
2951 /* Don't give an error if we already gave one earlier. */
2952 && TREE_TYPE (decl) != error_mark_node
2953 && (TREE_STATIC (decl)
2954 /* A static variable with an incomplete type
2955 is an error if it is initialized.
2956 Also if it is not file scope.
2957 Otherwise, let it through, but if it is not `extern'
2958 then it may cause an error message later. */
2959 ? (DECL_INITIAL (decl) != 0
2960 || !DECL_FILE_SCOPE_P (decl))
2961 /* An automatic variable with an incomplete type
2963 : !DECL_EXTERNAL (decl)))
2965 error ("%Jstorage size of '%D' isn't known", decl, decl);
2966 TREE_TYPE (decl) = error_mark_node;
2969 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2970 && DECL_SIZE (decl) != 0)
2972 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2973 constant_expression_warning (DECL_SIZE (decl));
2975 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2978 if (TREE_USED (type))
2979 TREE_USED (decl) = 1;
2982 /* If this is a function and an assembler name is specified, reset DECL_RTL
2983 so we can give it its new name. Also, update built_in_decls if it
2984 was a normal built-in. */
2985 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2987 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2989 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2990 set_user_assembler_name (builtin, asmspec);
2991 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2992 init_block_move_fn (asmspec);
2993 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2994 init_block_clear_fn (asmspec);
2996 set_user_assembler_name (decl, asmspec);
2999 /* If #pragma weak was used, mark the decl weak now. */
3000 if (current_scope == file_scope)
3001 maybe_apply_pragma_weak (decl);
3003 /* If this is a variable definition, determine its ELF visibility. */
3004 if (TREE_CODE (decl) == VAR_DECL
3005 && TREE_STATIC (decl)
3006 && !DECL_EXTERNAL (decl))
3007 c_determine_visibility (decl);
3009 /* Output the assembler code and/or RTL code for variables and functions,
3010 unless the type is an undefined structure or union.
3011 If not, it will get done when the type is completed. */
3013 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3015 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3016 if (c_dialect_objc ())
3017 objc_check_decl (decl);
3021 /* If this is not a static variable, issue a warning.
3022 It doesn't make any sense to give an ASMSPEC for an
3023 ordinary, non-register local variable. Historically,
3024 GCC has accepted -- but ignored -- the ASMSPEC in
3026 if (! DECL_FILE_SCOPE_P (decl)
3027 && TREE_CODE (decl) == VAR_DECL
3028 && !C_DECL_REGISTER (decl)
3029 && !TREE_STATIC (decl))
3030 warning ("%Jignoring asm-specifier for non-static local "
3031 "variable '%D'", decl, decl);
3032 else if (C_DECL_REGISTER (decl))
3033 change_decl_assembler_name (decl, get_identifier (asmspec));
3035 set_user_assembler_name (decl, asmspec);
3038 if (DECL_FILE_SCOPE_P (decl))
3040 if (DECL_INITIAL (decl) == NULL_TREE
3041 || DECL_INITIAL (decl) == error_mark_node)
3042 /* Don't output anything
3043 when a tentative file-scope definition is seen.
3044 But at end of compilation, do output code for them. */
3045 DECL_DEFER_OUTPUT (decl) = 1;
3046 rest_of_decl_compilation (decl, true, 0);
3050 /* In conjunction with an ASMSPEC, the `register'
3051 keyword indicates that we should place the variable
3052 in a particular register. */
3053 if (asmspec && C_DECL_REGISTER (decl))
3055 DECL_HARD_REGISTER (decl) = 1;
3056 /* This cannot be done for a structure with volatile
3057 fields, on which DECL_REGISTER will have been
3059 if (!DECL_REGISTER (decl))
3060 error ("cannot put object with volatile field into register");
3063 if (TREE_CODE (decl) != FUNCTION_DECL)
3065 /* If we're building a variable sized type, and we might be
3066 reachable other than via the top of the current binding
3067 level, then create a new BIND_EXPR so that we deallocate
3068 the object at the right time. */
3069 /* Note that DECL_SIZE can be null due to errors. */
3070 if (DECL_SIZE (decl)
3071 && !TREE_CONSTANT (DECL_SIZE (decl))
3072 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3075 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3076 TREE_SIDE_EFFECTS (bind) = 1;
3078 BIND_EXPR_BODY (bind) = push_stmt_list ();
3080 add_stmt (build_stmt (DECL_EXPR, decl));
3085 if (!DECL_FILE_SCOPE_P (decl))
3087 /* Recompute the RTL of a local array now
3088 if it used to be an incomplete type. */
3090 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3092 /* If we used it already as memory, it must stay in memory. */
3093 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3094 /* If it's still incomplete now, no init will save it. */
3095 if (DECL_SIZE (decl) == 0)
3096 DECL_INITIAL (decl) = 0;
3101 /* If this was marked 'used', be sure it will be output. */
3102 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3103 mark_decl_referenced (decl);
3105 if (TREE_CODE (decl) == TYPE_DECL)
3107 if (!DECL_FILE_SCOPE_P (decl)
3108 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3109 add_stmt (build_stmt (DECL_EXPR, decl));
3111 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3114 /* At the end of a declaration, throw away any variable type sizes
3115 of types defined inside that declaration. There is no use
3116 computing them in the following function definition. */
3117 if (current_scope == file_scope)
3118 get_pending_sizes ();
3120 /* Install a cleanup (aka destructor) if one was given. */
3121 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3123 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3126 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3127 tree cleanup_decl = lookup_name (cleanup_id);
3130 /* Build "cleanup(&decl)" for the destructor. */
3131 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3132 cleanup = build_tree_list (NULL_TREE, cleanup);
3133 cleanup = build_function_call (cleanup_decl, cleanup);
3135 /* Don't warn about decl unused; the cleanup uses it. */
3136 TREE_USED (decl) = 1;
3137 TREE_USED (cleanup_decl) = 1;
3139 /* Initialize EH, if we've been told to do so. */
3140 if (flag_exceptions && !c_eh_initialized_p)
3142 c_eh_initialized_p = true;
3143 eh_personality_libfunc
3144 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3145 ? "__gcc_personality_sj0"
3146 : "__gcc_personality_v0");
3147 using_eh_for_cleanups ();
3150 push_cleanup (decl, cleanup, false);
3155 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3156 and push that on the current scope. */
3159 push_parm_decl (tree parm)
3163 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3164 TREE_PURPOSE (TREE_PURPOSE (parm)),
3166 decl_attributes (&decl, TREE_VALUE (parm), 0);
3168 decl = pushdecl (decl);
3170 finish_decl (decl, NULL_TREE, NULL_TREE);
3173 /* Mark all the parameter declarations to date as forward decls.
3174 Also diagnose use of this extension. */
3177 mark_forward_parm_decls (void)
3179 struct c_binding *b;
3181 if (pedantic && !current_scope->warned_forward_parm_decls)
3183 pedwarn ("ISO C forbids forward parameter declarations");
3184 current_scope->warned_forward_parm_decls = true;
3187 for (b = current_scope->bindings; b; b = b->prev)
3188 if (TREE_CODE (b->decl) == PARM_DECL)
3189 TREE_ASM_WRITTEN (b->decl) = 1;
3192 static GTY(()) int compound_literal_number;
3194 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3195 literal, which may be an incomplete array type completed by the
3196 initializer; INIT is a CONSTRUCTOR that initializes the compound
3200 build_compound_literal (tree type, tree init)
3202 /* We do not use start_decl here because we have a type, not a declarator;
3203 and do not use finish_decl because the decl should be stored inside
3204 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3205 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3208 DECL_EXTERNAL (decl) = 0;
3209 TREE_PUBLIC (decl) = 0;
3210 TREE_STATIC (decl) = (current_scope == file_scope);
3211 DECL_CONTEXT (decl) = current_function_decl;
3212 TREE_USED (decl) = 1;
3213 TREE_TYPE (decl) = type;
3214 TREE_READONLY (decl) = TYPE_READONLY (type);
3215 store_init_value (decl, init);
3217 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3219 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3224 type = TREE_TYPE (decl);
3225 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3226 return error_mark_node;
3228 stmt = build_stmt (DECL_EXPR, decl);
3229 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3230 TREE_SIDE_EFFECTS (complit) = 1;
3232 layout_decl (decl, 0);
3234 if (TREE_STATIC (decl))
3236 /* This decl needs a name for the assembler output. We also need
3237 a unique suffix to be added to the name. */
3240 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3241 compound_literal_number);
3242 compound_literal_number++;
3243 DECL_NAME (decl) = get_identifier (name);
3244 DECL_DEFER_OUTPUT (decl) = 1;
3245 DECL_COMDAT (decl) = 1;
3246 DECL_ARTIFICIAL (decl) = 1;
3248 rest_of_decl_compilation (decl, 1, 0);
3254 /* Make TYPE a complete type based on INITIAL_VALUE.
3255 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3256 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3259 complete_array_type (tree type, tree initial_value, int do_default)
3261 tree maxindex = NULL_TREE;
3266 /* Note MAXINDEX is really the maximum index,
3267 one less than the size. */
3268 if (TREE_CODE (initial_value) == STRING_CST)
3271 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3272 maxindex = build_int_cst (NULL_TREE,
3273 (TREE_STRING_LENGTH (initial_value)
3276 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3278 tree elts = CONSTRUCTOR_ELTS (initial_value);
3279 maxindex = build_int_cst (NULL_TREE, -1, -1);
3280 for (; elts; elts = TREE_CHAIN (elts))
3282 if (TREE_PURPOSE (elts))
3283 maxindex = TREE_PURPOSE (elts);
3285 maxindex = fold (build2 (PLUS_EXPR, integer_type_node,
3286 maxindex, integer_one_node));
3291 /* Make an error message unless that happened already. */
3292 if (initial_value != error_mark_node)
3295 /* Prevent further error messages. */
3296 maxindex = build_int_cst (NULL_TREE, 0, 0);
3303 maxindex = build_int_cst (NULL_TREE, 0, 0);
3309 TYPE_DOMAIN (type) = build_index_type (maxindex);
3310 if (!TREE_TYPE (maxindex))
3314 /* Lay out the type now that we can get the real answer. */
3321 /* Determine whether TYPE is a structure with a flexible array member,
3322 or a union containing such a structure (possibly recursively). */
3325 flexible_array_type_p (tree type)
3328 switch (TREE_CODE (type))
3331 x = TYPE_FIELDS (type);
3334 while (TREE_CHAIN (x) != NULL_TREE)
3336 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3337 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3338 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3339 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3343 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3345 if (flexible_array_type_p (TREE_TYPE (x)))
3354 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3355 replacing with appropriate values if they are invalid. */
3357 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3360 unsigned int max_width;
3361 unsigned HOST_WIDE_INT w;
3362 const char *name = orig_name ? orig_name: _("<anonymous>");
3365 STRIP_NOPS (*width);
3367 /* Detect and ignore out of range field width and process valid
3369 if (TREE_CODE (*width) != INTEGER_CST)
3371 error ("bit-field `%s' width not an integer constant", name);
3372 *width = integer_one_node;
3376 constant_expression_warning (*width);
3377 if (tree_int_cst_sgn (*width) < 0)
3379 error ("negative width in bit-field `%s'", name);
3380 *width = integer_one_node;
3382 else if (integer_zerop (*width) && orig_name)
3384 error ("zero width for bit-field `%s'", name);
3385 *width = integer_one_node;
3389 /* Detect invalid bit-field type. */
3390 if (TREE_CODE (*type) != INTEGER_TYPE
3391 && TREE_CODE (*type) != BOOLEAN_TYPE
3392 && TREE_CODE (*type) != ENUMERAL_TYPE)
3394 error ("bit-field `%s' has invalid type", name);
3395 *type = unsigned_type_node;
3398 type_mv = TYPE_MAIN_VARIANT (*type);
3400 && type_mv != integer_type_node
3401 && type_mv != unsigned_type_node
3402 && type_mv != boolean_type_node)
3403 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3405 if (type_mv == boolean_type_node)
3406 max_width = CHAR_TYPE_SIZE;
3408 max_width = TYPE_PRECISION (*type);
3410 if (0 < compare_tree_int (*width, max_width))
3412 error ("width of `%s' exceeds its type", name);
3414 *width = build_int_cst (NULL_TREE, w, 0);
3417 w = tree_low_cst (*width, 1);
3419 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3421 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3423 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3424 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3425 warning ("`%s' is narrower than values of its type", name);
3429 /* Given declspecs and a declarator,
3430 determine the name and type of the object declared
3431 and construct a ..._DECL node for it.
3432 (In one case we can return a ..._TYPE node instead.
3433 For invalid input we sometimes return 0.)
3435 DECLSPECS is a chain of tree_list nodes whose value fields
3436 are the storage classes and type specifiers.
3438 DECL_CONTEXT says which syntactic context this declaration is in:
3439 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3440 FUNCDEF for a function definition. Like NORMAL but a few different
3441 error messages in each case. Return value may be zero meaning
3442 this definition is too screwy to try to parse.
3443 PARM for a parameter declaration (either within a function prototype
3444 or before a function body). Make a PARM_DECL, or return void_type_node.
3445 TYPENAME if for a typename (in a cast or sizeof).
3446 Don't make a DECL node; just return the ..._TYPE node.
3447 FIELD for a struct or union field; make a FIELD_DECL.
3448 INITIALIZED is 1 if the decl has an initializer.
3449 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3450 representing the width of the bit-field.
3452 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3453 It may also be so in the PARM case, for a prototype where the
3454 argument type is specified but not the name.
3456 This function is where the complicated C meanings of `static'
3457 and `extern' are interpreted. */
3460 grokdeclarator (tree declarator, tree declspecs,
3461 enum decl_context decl_context, int initialized, tree *width)
3465 tree type = NULL_TREE;
3470 int type_quals = TYPE_UNQUALIFIED;
3472 int explicit_int = 0;
3473 int explicit_char = 0;
3474 int defaulted_int = 0;
3475 tree typedef_decl = 0;
3476 const char *name, *orig_name;
3477 tree typedef_type = 0;
3478 int funcdef_flag = 0;
3479 enum tree_code innermost_code = ERROR_MARK;
3480 int size_varies = 0;
3481 tree decl_attr = NULL_TREE;
3482 tree array_ptr_quals = NULL_TREE;
3483 int array_parm_static = 0;
3484 tree returned_attrs = NULL_TREE;
3485 bool bitfield = width != NULL;
3487 tree arg_info = NULL_TREE;
3489 if (decl_context == FUNCDEF)
3490 funcdef_flag = 1, decl_context = NORMAL;
3492 /* Look inside a declarator for the name being declared
3493 and get it as a string, for an error message. */
3495 tree decl = declarator;
3499 switch (TREE_CODE (decl))
3504 innermost_code = TREE_CODE (decl);
3505 decl = TREE_OPERAND (decl, 0);
3509 decl = TREE_VALUE (decl);
3512 case IDENTIFIER_NODE:
3513 name = IDENTIFIER_POINTER (decl);
3525 /* A function definition's declarator must have the form of
3526 a function declarator. */
3528 if (funcdef_flag && innermost_code != CALL_EXPR)
3531 /* If this looks like a function definition, make it one,
3532 even if it occurs where parms are expected.
3533 Then store_parm_decls will reject it and not use it as a parm. */
3534 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3535 decl_context = PARM;
3537 /* Look through the decl specs and record which ones appear.
3538 Some typespecs are defined as built-in typenames.
3539 Others, the ones that are modifiers of other types,
3540 are represented by bits in SPECBITS: set the bits for
3541 the modifiers that appear. Storage class keywords are also in SPECBITS.
3543 If there is a typedef name or a type, store the type in TYPE.
3544 This includes builtin typedefs such as `int'.
3546 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3547 and did not come from a user typedef.
3549 Set LONGLONG if `long' is mentioned twice. */
3551 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3553 tree id = TREE_VALUE (spec);
3555 /* If the entire declaration is itself tagged as deprecated then
3556 suppress reports of deprecated items. */
3557 if (id && TREE_DEPRECATED (id))
3559 if (deprecated_state != DEPRECATED_SUPPRESS)
3560 warn_deprecated_use (id);
3563 if (id == ridpointers[(int) RID_INT])
3565 if (id == ridpointers[(int) RID_CHAR])
3568 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3570 enum rid i = C_RID_CODE (id);
3571 if ((int) i <= (int) RID_LAST_MODIFIER)
3573 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3576 error ("`long long long' is too long for GCC");
3579 if (pedantic && !flag_isoc99 && ! in_system_header
3581 pedwarn ("ISO C90 does not support `long long'");
3585 else if (specbits & (1 << (int) i))
3587 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3589 if (pedantic && !flag_isoc99)
3590 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3593 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3596 /* Diagnose "__thread extern". Recall that this list
3597 is in the reverse order seen in the text. */
3599 && (specbits & (1 << (int) RID_EXTERN
3600 | 1 << (int) RID_STATIC)))
3602 if (specbits & 1 << (int) RID_EXTERN)
3603 error ("`__thread' before `extern'");
3605 error ("`__thread' before `static'");
3608 specbits |= 1 << (int) i;
3613 error ("two or more data types in declaration of `%s'", name);
3614 /* Actual typedefs come to us as TYPE_DECL nodes. */
3615 else if (TREE_CODE (id) == TYPE_DECL)
3617 if (TREE_TYPE (id) == error_mark_node)
3618 ; /* Allow the type to default to int to avoid cascading errors. */
3621 type = TREE_TYPE (id);
3622 decl_attr = DECL_ATTRIBUTES (id);
3626 /* Built-in types come as identifiers. */
3627 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3629 tree t = lookup_name (id);
3630 if (!t || TREE_CODE (t) != TYPE_DECL)
3631 error ("`%s' fails to be a typedef or built in type",
3632 IDENTIFIER_POINTER (id));
3633 else if (TREE_TYPE (t) == error_mark_node)
3637 type = TREE_TYPE (t);
3641 else if (TREE_CODE (id) != ERROR_MARK)
3648 typedef_type = type;
3650 size_varies = C_TYPE_VARIABLE_SIZE (type);
3652 /* No type at all: default to `int', and set DEFAULTED_INT
3653 because it was not a user-defined typedef. */
3657 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3658 | (1 << (int) RID_SIGNED)
3659 | (1 << (int) RID_UNSIGNED)
3660 | (1 << (int) RID_COMPLEX))))
3661 /* Don't warn about typedef foo = bar. */
3662 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3663 && ! in_system_header)
3665 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3666 and this is a function, or if -Wimplicit; prefer the former
3667 warning since it is more explicit. */
3668 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3670 warn_about_return_type = 1;
3671 else if (warn_implicit_int || flag_isoc99)
3672 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3677 type = integer_type_node;
3680 /* Now process the modifiers that were specified
3681 and check for invalid combinations. */
3683 /* Long double is a special combination. */
3685 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3686 && TYPE_MAIN_VARIANT (type) == double_type_node)
3688 specbits &= ~(1 << (int) RID_LONG);
3689 type = long_double_type_node;
3692 /* Check all other uses of type modifiers. */
3694 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3695 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3699 if ((specbits & 1 << (int) RID_LONG)
3700 && (specbits & 1 << (int) RID_SHORT))
3701 error ("both long and short specified for `%s'", name);
3702 else if (((specbits & 1 << (int) RID_LONG)
3703 || (specbits & 1 << (int) RID_SHORT))
3705 error ("long or short specified with char for `%s'", name);
3706 else if (((specbits & 1 << (int) RID_LONG)
3707 || (specbits & 1 << (int) RID_SHORT))
3708 && TREE_CODE (type) == REAL_TYPE)
3710 static int already = 0;
3712 error ("long or short specified with floating type for `%s'", name);
3713 if (! already && ! pedantic)
3715 error ("the only valid combination is `long double'");
3719 else if ((specbits & 1 << (int) RID_SIGNED)
3720 && (specbits & 1 << (int) RID_UNSIGNED))
3721 error ("both signed and unsigned specified for `%s'", name);
3722 else if (TREE_CODE (type) != INTEGER_TYPE)
3723 error ("long, short, signed or unsigned invalid for `%s'", name);
3727 if (!explicit_int && !defaulted_int && !explicit_char)
3729 error ("long, short, signed or unsigned used invalidly for `%s'",
3735 /* Discard the type modifiers if they are invalid. */
3738 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3739 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3744 if ((specbits & (1 << (int) RID_COMPLEX))
3745 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3747 error ("complex invalid for `%s'", name);
3748 specbits &= ~(1 << (int) RID_COMPLEX);
3751 /* Decide whether an integer type is signed or not.
3752 Optionally treat bit-fields as signed by default. */
3753 if (specbits & 1 << (int) RID_UNSIGNED
3754 || (bitfield && ! flag_signed_bitfields
3755 && (explicit_int || defaulted_int || explicit_char
3756 /* A typedef for plain `int' without `signed'
3757 can be controlled just like plain `int'. */
3758 || ! (typedef_decl != 0
3759 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3760 && TREE_CODE (type) != ENUMERAL_TYPE
3761 && !(specbits & 1 << (int) RID_SIGNED)))
3764 type = long_long_unsigned_type_node;
3765 else if (specbits & 1 << (int) RID_LONG)
3766 type = long_unsigned_type_node;
3767 else if (specbits & 1 << (int) RID_SHORT)
3768 type = short_unsigned_type_node;
3769 else if (type == char_type_node)
3770 type = unsigned_char_type_node;
3771 else if (typedef_decl)
3772 type = c_common_unsigned_type (type);
3774 type = unsigned_type_node;
3776 else if ((specbits & 1 << (int) RID_SIGNED)
3777 && type == char_type_node)
3778 type = signed_char_type_node;
3780 type = long_long_integer_type_node;
3781 else if (specbits & 1 << (int) RID_LONG)
3782 type = long_integer_type_node;
3783 else if (specbits & 1 << (int) RID_SHORT)
3784 type = short_integer_type_node;
3786 if (specbits & 1 << (int) RID_COMPLEX)
3788 if (pedantic && !flag_isoc99)
3789 pedwarn ("ISO C90 does not support complex types");
3790 /* If we just have "complex", it is equivalent to
3791 "complex double", but if any modifiers at all are specified it is
3792 the complex form of TYPE. E.g, "complex short" is
3793 "complex short int". */
3795 if (defaulted_int && ! longlong
3796 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3797 | (1 << (int) RID_SIGNED)
3798 | (1 << (int) RID_UNSIGNED))))
3801 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3802 type = complex_double_type_node;
3804 else if (type == integer_type_node)
3807 pedwarn ("ISO C does not support complex integer types");
3808 type = complex_integer_type_node;
3810 else if (type == float_type_node)
3811 type = complex_float_type_node;
3812 else if (type == double_type_node)
3813 type = complex_double_type_node;
3814 else if (type == long_double_type_node)
3815 type = complex_long_double_type_node;
3819 pedwarn ("ISO C does not support complex integer types");
3820 type = build_complex_type (type);
3824 /* Check the type and width of a bit-field. */
3826 check_bitfield_type_and_width (&type, width, orig_name);
3828 /* Figure out the type qualifiers for the declaration. There are
3829 two ways a declaration can become qualified. One is something
3830 like `const int i' where the `const' is explicit. Another is
3831 something like `typedef const int CI; CI i' where the type of the
3832 declaration contains the `const'. A third possibility is that
3833 there is a type qualifier on the element type of a typedefed
3834 array type, in which case we should extract that qualifier so
3835 that c_apply_type_quals_to_decls receives the full list of
3836 qualifiers to work with (C90 is not entirely clear about whether
3837 duplicate qualifiers should be diagnosed in this case, but it
3838 seems most appropriate to do so). */
3839 element_type = strip_array_types (type);
3840 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3842 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3844 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3845 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3846 if (pedantic && !flag_isoc99)
3849 pedwarn ("duplicate `const'");
3851 pedwarn ("duplicate `restrict'");
3853 pedwarn ("duplicate `volatile'");
3855 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3856 type = TYPE_MAIN_VARIANT (type);
3857 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3858 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3859 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3861 /* Warn if two storage classes are given. Default to `auto'. */
3866 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3867 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3868 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3869 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3870 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3872 /* "static __thread" and "extern __thread" are allowed. */
3873 if ((specbits & (1 << (int) RID_THREAD
3874 | 1 << (int) RID_STATIC
3875 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3878 /* Warn about storage classes that are invalid for certain
3879 kinds of declarations (parameters, typenames, etc.). */
3882 error ("multiple storage classes in declaration of `%s'", name);
3883 else if (funcdef_flag
3885 & ((1 << (int) RID_REGISTER)
3886 | (1 << (int) RID_AUTO)
3887 | (1 << (int) RID_TYPEDEF)
3888 | (1 << (int) RID_THREAD))))
3890 if (specbits & 1 << (int) RID_AUTO
3891 && (pedantic || current_scope == file_scope))
3892 pedwarn ("function definition declared `auto'");
3893 if (specbits & 1 << (int) RID_REGISTER)
3894 error ("function definition declared `register'");
3895 if (specbits & 1 << (int) RID_TYPEDEF)
3896 error ("function definition declared `typedef'");
3897 if (specbits & 1 << (int) RID_THREAD)
3898 error ("function definition declared `__thread'");
3899 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3900 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3902 else if (decl_context != NORMAL && nclasses > 0)
3904 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3908 switch (decl_context)
3911 error ("storage class specified for structure field `%s'",
3915 error ("storage class specified for parameter `%s'", name);
3918 error ("storage class specified for typename");
3921 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3922 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3923 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3926 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3928 /* `extern' with initialization is invalid if not at file scope. */
3929 if (current_scope == file_scope)
3930 warning ("`%s' initialized and declared `extern'", name);
3932 error ("`%s' has both `extern' and initializer", name);
3934 else if (current_scope == file_scope)
3936 if (specbits & 1 << (int) RID_AUTO)
3937 error ("file-scope declaration of `%s' specifies `auto'", name);
3941 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3942 error ("nested function `%s' declared `extern'", name);
3943 else if ((specbits & (1 << (int) RID_THREAD
3944 | 1 << (int) RID_EXTERN
3945 | 1 << (int) RID_STATIC))
3946 == (1 << (int) RID_THREAD))
3948 error ("function-scope `%s' implicitly auto and declared `__thread'",
3950 specbits &= ~(1 << (int) RID_THREAD);
3955 /* Now figure out the structure of the declarator proper.
3956 Descend through it, creating more complex types, until we reach
3957 the declared identifier (or NULL_TREE, in an absolute declarator). */
3959 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3961 if (type == error_mark_node)
3963 declarator = TREE_OPERAND (declarator, 0);
3967 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3968 an INDIRECT_REF (for *...),
3969 a CALL_EXPR (for ...(...)),
3970 a TREE_LIST (for nested attributes),
3971 an identifier (for the name being declared)
3972 or a null pointer (for the place in an absolute declarator
3973 where the name was omitted).
3974 For the last two cases, we have just exited the loop.
3976 At this point, TYPE is the type of elements of an array,
3977 or for a function to return, or for a pointer to point to.
3978 After this sequence of ifs, TYPE is the type of the
3979 array or function or pointer, and DECLARATOR has had its
3980 outermost layer removed. */
3982 if (array_ptr_quals != NULL_TREE || array_parm_static)
3984 /* Only the innermost declarator (making a parameter be of
3985 array type which is converted to pointer type)
3986 may have static or type qualifiers. */
3987 error ("static or type qualifiers in non-parameter array declarator");
3988 array_ptr_quals = NULL_TREE;
3989 array_parm_static = 0;
3992 if (TREE_CODE (declarator) == TREE_LIST)
3994 /* We encode a declarator with embedded attributes using
3996 tree attrs = TREE_PURPOSE (declarator);
3999 declarator = TREE_VALUE (declarator);
4000 inner_decl = declarator;
4001 while (inner_decl != NULL_TREE
4002 && TREE_CODE (inner_decl) == TREE_LIST)
4003 inner_decl = TREE_VALUE (inner_decl);
4004 if (inner_decl == NULL_TREE
4005 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4006 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4007 else if (TREE_CODE (inner_decl) == CALL_EXPR)
4008 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4009 else if (TREE_CODE (inner_decl) == ARRAY_REF)
4010 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4011 returned_attrs = decl_attributes (&type,
4012 chainon (returned_attrs, attrs),
4015 else if (TREE_CODE (declarator) == ARRAY_REF)
4017 tree itype = NULL_TREE;
4018 tree size = TREE_OPERAND (declarator, 1);
4019 /* The index is a signed object `sizetype' bits wide. */
4020 tree index_type = c_common_signed_type (sizetype);
4022 array_ptr_quals = TREE_TYPE (declarator);
4023 array_parm_static = TREE_STATIC (declarator);
4025 declarator = TREE_OPERAND (declarator, 0);
4027 /* Check for some types that there cannot be arrays of. */
4029 if (VOID_TYPE_P (type))
4031 error ("declaration of `%s' as array of voids", name);
4032 type = error_mark_node;
4035 if (TREE_CODE (type) == FUNCTION_TYPE)
4037 error ("declaration of `%s' as array of functions", name);
4038 type = error_mark_node;
4041 if (pedantic && !in_system_header && flexible_array_type_p (type))
4042 pedwarn ("invalid use of structure with flexible array member");
4044 if (size == error_mark_node)
4045 type = error_mark_node;
4047 if (type == error_mark_node)
4050 /* If size was specified, set ITYPE to a range-type for that size.
4051 Otherwise, ITYPE remains null. finish_decl may figure it out
4052 from an initial value. */
4056 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4057 STRIP_TYPE_NOPS (size);
4059 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4061 error ("size of array `%s' has non-integer type", name);
4062 size = integer_one_node;
4065 if (pedantic && integer_zerop (size))
4066 pedwarn ("ISO C forbids zero-size array `%s'", name);
4068 if (TREE_CODE (size) == INTEGER_CST)
4070 constant_expression_warning (size);
4071 if (tree_int_cst_sgn (size) < 0)
4073 error ("size of array `%s' is negative", name);
4074 size = integer_one_node;
4079 /* Make sure the array size remains visibly nonconstant
4080 even if it is (eg) a const variable with known value. */
4083 if (!flag_isoc99 && pedantic)
4085 if (TREE_CONSTANT (size))
4086 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
4089 pedwarn ("ISO C90 forbids variable-size array `%s'",
4094 if (integer_zerop (size))
4096 /* A zero-length array cannot be represented with an
4097 unsigned index type, which is what we'll get with
4098 build_index_type. Create an open-ended range instead. */
4099 itype = build_range_type (sizetype, size, NULL_TREE);
4103 /* Compute the maximum valid index, that is, size - 1.
4104 Do the calculation in index_type, so that if it is
4105 a variable the computations will be done in the
4107 itype = fold (build2 (MINUS_EXPR, index_type,
4108 convert (index_type, size),
4109 convert (index_type, size_one_node)));
4111 /* If that overflowed, the array is too big.
4112 ??? While a size of INT_MAX+1 technically shouldn't
4113 cause an overflow (because we subtract 1), the overflow
4114 is recorded during the conversion to index_type, before
4115 the subtraction. Handling this case seems like an
4116 unnecessary complication. */
4117 if (TREE_OVERFLOW (itype))
4119 error ("size of array `%s' is too large", name);
4120 type = error_mark_node;
4125 itype = variable_size (itype);
4126 itype = build_index_type (itype);
4129 else if (decl_context == FIELD)
4131 if (pedantic && !flag_isoc99 && !in_system_header)
4132 pedwarn ("ISO C90 does not support flexible array members");
4134 /* ISO C99 Flexible array members are effectively identical
4135 to GCC's zero-length array extension. */
4136 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4139 /* If pedantic, complain about arrays of incomplete types. */
4141 if (pedantic && !COMPLETE_TYPE_P (type))
4142 pedwarn ("array type has incomplete element type");
4144 /* Build the array type itself, then merge any constancy or
4145 volatility into the target type. We must do it in this order
4146 to ensure that the TYPE_MAIN_VARIANT field of the array type
4147 is set correctly. */
4149 type = build_array_type (type, itype);
4151 type = c_build_qualified_type (type, type_quals);
4154 C_TYPE_VARIABLE_SIZE (type) = 1;
4156 /* The GCC extension for zero-length arrays differs from
4157 ISO flexible array members in that sizeof yields zero. */
4158 if (size && integer_zerop (size))
4161 TYPE_SIZE (type) = bitsize_zero_node;
4162 TYPE_SIZE_UNIT (type) = size_zero_node;
4164 else if (declarator && TREE_CODE (declarator) == INDIRECT_REF)
4165 /* We can never complete an array type which is the target of a
4166 pointer, so go ahead and lay it out. */
4169 if (decl_context != PARM
4170 && (array_ptr_quals != NULL_TREE || array_parm_static))
4172 error ("static or type qualifiers in non-parameter array declarator");
4173 array_ptr_quals = NULL_TREE;
4174 array_parm_static = 0;
4177 else if (TREE_CODE (declarator) == CALL_EXPR)
4179 /* Say it's a definition only for the declarator closest to
4180 the identifier, apart possibly from some attributes. */
4181 bool really_funcdef = false;
4185 tree t = TREE_OPERAND (declarator, 0);
4186 while (TREE_CODE (t) == TREE_LIST)
4188 really_funcdef = (TREE_CODE (t) == IDENTIFIER_NODE);
4191 /* Declaring a function type.
4192 Make sure we have a valid type for the function to return. */
4193 if (type == error_mark_node)
4198 /* Warn about some types functions can't return. */
4200 if (TREE_CODE (type) == FUNCTION_TYPE)
4202 error ("`%s' declared as function returning a function", name);
4203 type = integer_type_node;
4205 if (TREE_CODE (type) == ARRAY_TYPE)
4207 error ("`%s' declared as function returning an array", name);
4208 type = integer_type_node;
4211 /* Construct the function type and go to the next
4212 inner layer of declarator. */
4213 arg_info = TREE_OPERAND (declarator, 1);
4214 arg_types = grokparms (arg_info, really_funcdef);
4216 /* Type qualifiers before the return type of the function
4217 qualify the return type, not the function type. */
4220 /* Type qualifiers on a function return type are
4221 normally permitted by the standard but have no
4222 effect, so give a warning at -Wreturn-type.
4223 Qualifiers on a void return type are banned on
4224 function definitions in ISO C; GCC used to used them
4225 for noreturn functions. */
4226 if (VOID_TYPE_P (type) && really_funcdef)
4227 pedwarn ("function definition has qualified void return type");
4228 else if (warn_return_type)
4229 warning ("type qualifiers ignored on function return type");
4231 type = c_build_qualified_type (type, type_quals);
4233 type_quals = TYPE_UNQUALIFIED;
4235 type = build_function_type (type, arg_types);
4236 declarator = TREE_OPERAND (declarator, 0);
4238 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4239 the formal parameter list of this FUNCTION_TYPE to point to
4240 the FUNCTION_TYPE node itself. */
4245 for (link = ARG_INFO_TAGS (arg_info);
4247 link = TREE_CHAIN (link))
4248 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4251 else if (TREE_CODE (declarator) == INDIRECT_REF)
4253 /* Merge any constancy or volatility into the target type
4256 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4258 pedwarn ("ISO C forbids qualified function types");
4260 type = c_build_qualified_type (type, type_quals);
4261 type_quals = TYPE_UNQUALIFIED;
4264 type = build_pointer_type (type);
4266 /* Process a list of type modifier keywords
4267 (such as const or volatile) that were given inside the `*'. */
4269 if (TREE_TYPE (declarator))
4277 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4278 typemodlist = TREE_CHAIN (typemodlist))
4280 tree qualifier = TREE_VALUE (typemodlist);
4282 if (C_IS_RESERVED_WORD (qualifier))
4284 if (C_RID_CODE (qualifier) == RID_CONST)
4286 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4288 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4298 error ("invalid type modifier within pointer declarator");
4299 if (pedantic && !flag_isoc99)
4302 pedwarn ("duplicate `const'");
4304 pedwarn ("duplicate `volatile'");
4306 pedwarn ("duplicate `restrict'");
4309 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4310 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4311 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4314 declarator = TREE_OPERAND (declarator, 0);
4321 /* Now TYPE has the actual type. */
4323 /* Did array size calculations overflow? */
4325 if (TREE_CODE (type) == ARRAY_TYPE
4326 && COMPLETE_TYPE_P (type)
4327 && TREE_OVERFLOW (TYPE_SIZE (type)))
4329 error ("size of array `%s' is too large", name);
4330 /* If we proceed with the array type as it is, we'll eventually
4331 crash in tree_low_cst(). */
4332 type = error_mark_node;
4335 /* If this is declaring a typedef name, return a TYPE_DECL. */
4337 if (specbits & (1 << (int) RID_TYPEDEF))
4340 /* Note that the grammar rejects storage classes
4341 in typenames, fields or parameters */
4342 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4344 pedwarn ("ISO C forbids qualified function types");
4346 type = c_build_qualified_type (type, type_quals);
4347 decl = build_decl (TYPE_DECL, declarator, type);
4348 if ((specbits & (1 << (int) RID_SIGNED))
4349 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4350 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4351 decl_attributes (&decl, returned_attrs, 0);
4355 /* Detect the case of an array type of unspecified size
4356 which came, as such, direct from a typedef name.
4357 We must copy the type, so that each identifier gets
4358 a distinct type, so that each identifier's size can be
4359 controlled separately by its own initializer. */
4361 if (type != 0 && typedef_type != 0
4362 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4363 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4365 type = build_array_type (TREE_TYPE (type), 0);
4367 C_TYPE_VARIABLE_SIZE (type) = 1;
4370 /* If this is a type name (such as, in a cast or sizeof),
4371 compute the type and return it now. */
4373 if (decl_context == TYPENAME)
4375 /* Note that the grammar rejects storage classes
4376 in typenames, fields or parameters */
4377 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4379 pedwarn ("ISO C forbids const or volatile function types");
4381 type = c_build_qualified_type (type, type_quals);
4382 decl_attributes (&type, returned_attrs, 0);
4386 /* Aside from typedefs and type names (handle above),
4387 `void' at top level (not within pointer)
4388 is allowed only in public variables.
4389 We don't complain about parms either, but that is because
4390 a better error message can be made later. */
4392 if (VOID_TYPE_P (type) && decl_context != PARM
4393 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4394 && ((specbits & (1 << (int) RID_EXTERN))
4395 || (current_scope == file_scope
4397 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4399 error ("variable or field `%s' declared void", name);
4400 type = integer_type_node;
4403 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4404 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4409 if (decl_context == PARM)
4411 tree type_as_written;
4414 /* A parameter declared as an array of T is really a pointer to T.
4415 One declared as a function is really a pointer to a function. */
4417 if (TREE_CODE (type) == ARRAY_TYPE)
4419 /* Transfer const-ness of array into that of type pointed to. */
4420 type = TREE_TYPE (type);
4422 type = c_build_qualified_type (type, type_quals);
4423 type = build_pointer_type (type);
4424 type_quals = TYPE_UNQUALIFIED;
4425 if (array_ptr_quals)
4427 tree new_ptr_quals, new_ptr_attrs;
4429 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4430 /* We don't yet implement attributes in this context. */
4431 if (new_ptr_attrs != NULL_TREE)
4432 warning ("attributes in parameter array declarator ignored");
4437 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4439 tree qualifier = TREE_VALUE (new_ptr_quals);
4441 if (C_IS_RESERVED_WORD (qualifier))
4443 if (C_RID_CODE (qualifier) == RID_CONST)
4445 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4447 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4457 error ("invalid type modifier within array declarator");
4459 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4460 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4461 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4465 else if (TREE_CODE (type) == FUNCTION_TYPE)
4467 if (pedantic && type_quals)
4468 pedwarn ("ISO C forbids qualified function types");
4470 type = c_build_qualified_type (type, type_quals);
4471 type = build_pointer_type (type);
4472 type_quals = TYPE_UNQUALIFIED;
4474 else if (type_quals)
4475 type = c_build_qualified_type (type, type_quals);
4477 type_as_written = type;
4479 decl = build_decl (PARM_DECL, declarator, type);
4481 C_DECL_VARIABLE_SIZE (decl) = 1;
4483 /* Compute the type actually passed in the parmlist,
4484 for the case where there is no prototype.
4485 (For example, shorts and chars are passed as ints.)
4486 When there is a prototype, this is overridden later. */
4488 if (type == error_mark_node)
4489 promoted_type = type;
4491 promoted_type = c_type_promotes_to (type);
4493 DECL_ARG_TYPE (decl) = promoted_type;
4494 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4496 else if (decl_context == FIELD)
4498 /* Structure field. It may not be a function. */
4500 if (TREE_CODE (type) == FUNCTION_TYPE)
4502 error ("field `%s' declared as a function", name);
4503 type = build_pointer_type (type);
4505 else if (TREE_CODE (type) != ERROR_MARK
4506 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4508 error ("field `%s' has incomplete type", name);
4509 type = error_mark_node;
4511 /* Move type qualifiers down to element of an array. */
4512 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4513 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4515 TYPE_DOMAIN (type));
4516 decl = build_decl (FIELD_DECL, declarator, type);
4517 DECL_NONADDRESSABLE_P (decl) = bitfield;
4520 C_DECL_VARIABLE_SIZE (decl) = 1;
4522 else if (TREE_CODE (type) == FUNCTION_TYPE)
4524 if (specbits & (1 << (int) RID_AUTO)
4525 && (pedantic || current_scope == file_scope))
4526 pedwarn ("invalid storage class for function `%s'", name);
4527 if (specbits & (1 << (int) RID_REGISTER))
4528 error ("invalid storage class for function `%s'", name);
4529 if (specbits & (1 << (int) RID_THREAD))
4530 error ("invalid storage class for function `%s'", name);
4531 /* Function declaration not at file scope.
4532 Storage classes other than `extern' are not allowed
4533 and `extern' makes no difference. */
4534 if (current_scope != file_scope
4535 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4537 pedwarn ("invalid storage class for function `%s'", name);
4539 decl = build_decl (FUNCTION_DECL, declarator, type);
4540 decl = build_decl_attribute_variant (decl, decl_attr);
4542 DECL_LANG_SPECIFIC (decl)
4543 = GGC_CNEW (struct lang_decl);
4545 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4546 pedwarn ("ISO C forbids qualified function types");
4548 /* GNU C interprets a volatile-qualified function type to indicate
4549 that the function does not return. */
4550 if ((type_quals & TYPE_QUAL_VOLATILE)
4551 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4552 warning ("`noreturn' function returns non-void value");
4554 /* Every function declaration is an external reference
4555 (DECL_EXTERNAL) except for those which are not at file
4556 scope and are explicitly declared "auto". This is
4557 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4558 GCC to signify a forward declaration of a nested function. */
4559 if ((specbits & (1 << RID_AUTO)) && current_scope != file_scope)
4560 DECL_EXTERNAL (decl) = 0;
4562 DECL_EXTERNAL (decl) = 1;
4564 /* Record absence of global scope for `static' or `auto'. */
4566 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4568 /* For a function definition, record the argument information
4569 block in DECL_ARGUMENTS where store_parm_decls will look
4572 DECL_ARGUMENTS (decl) = arg_info;
4575 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4577 /* Record presence of `inline', if it is reasonable. */
4578 if (MAIN_NAME_P (declarator))
4581 warning ("cannot inline function `main'");
4585 /* Record that the function is declared `inline'. */
4586 DECL_DECLARED_INLINE_P (decl) = 1;
4588 /* Do not mark bare declarations as DECL_INLINE. Doing so
4589 in the presence of multiple declarations can result in
4590 the abstract origin pointing between the declarations,
4591 which will confuse dwarf2out. */
4594 DECL_INLINE (decl) = 1;
4595 if (specbits & (1 << (int) RID_EXTERN))
4596 current_extern_inline = 1;
4599 /* If -finline-functions, assume it can be inlined. This does
4600 two things: let the function be deferred until it is actually
4601 needed, and let dwarf2 know that the function is inlinable. */
4602 else if (flag_inline_trees == 2 && initialized)
4603 DECL_INLINE (decl) = 1;
4607 /* It's a variable. */
4608 /* An uninitialized decl with `extern' is a reference. */
4609 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4611 /* Move type qualifiers down to element of an array. */
4612 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4614 int saved_align = TYPE_ALIGN(type);
4615 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4617 TYPE_DOMAIN (type));
4618 TYPE_ALIGN (type) = saved_align;
4620 else if (type_quals)
4621 type = c_build_qualified_type (type, type_quals);
4623 /* C99 6.2.2p7: It is invalid (compile-time undefined
4624 behavior) to create an 'extern' declaration for a
4625 variable if there is a global declaration that is
4626 'static' and the global declaration is not visible.
4627 (If the static declaration _is_ currently visible,
4628 the 'extern' declaration is taken to refer to that decl.) */
4629 if (extern_ref && current_scope != file_scope)
4631 tree global_decl = identifier_global_value (declarator);
4632 tree visible_decl = lookup_name (declarator);
4635 && global_decl != visible_decl
4636 && TREE_CODE (global_decl) == VAR_DECL
4637 && !TREE_PUBLIC (global_decl))
4638 error ("variable previously declared 'static' redeclared "
4642 decl = build_decl (VAR_DECL, declarator, type);
4644 C_DECL_VARIABLE_SIZE (decl) = 1;
4647 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4649 /* At file scope, an initialized extern declaration may follow
4650 a static declaration. In that case, DECL_EXTERNAL will be
4651 reset later in start_decl. */
4652 DECL_EXTERNAL (decl) = !!(specbits & (1 << (int) RID_EXTERN));
4654 /* At file scope, the presence of a `static' or `register' storage
4655 class specifier, or the absence of all storage class specifiers
4656 makes this declaration a definition (perhaps tentative). Also,
4657 the absence of both `static' and `register' makes it public. */
4658 if (current_scope == file_scope)
4660 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4661 | (1 << (int) RID_REGISTER)));
4662 TREE_STATIC (decl) = !extern_ref;
4664 /* Not at file scope, only `static' makes a static definition. */
4667 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4668 TREE_PUBLIC (decl) = extern_ref;
4671 if (specbits & 1 << (int) RID_THREAD)
4673 if (targetm.have_tls)
4674 DECL_THREAD_LOCAL (decl) = 1;
4676 /* A mere warning is sure to result in improper semantics
4677 at runtime. Don't bother to allow this to compile. */
4678 error ("thread-local storage not supported for this target");
4682 /* Record `register' declaration for warnings on &
4683 and in case doing stupid register allocation. */
4685 if (specbits & (1 << (int) RID_REGISTER))
4687 C_DECL_REGISTER (decl) = 1;
4688 DECL_REGISTER (decl) = 1;
4691 /* Record constancy and volatility. */
4692 c_apply_type_quals_to_decl (type_quals, decl);
4694 /* If a type has volatile components, it should be stored in memory.
4695 Otherwise, the fact that those components are volatile
4696 will be ignored, and would even crash the compiler. */
4697 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4699 /* It is not an error for a structure with volatile fields to
4700 be declared register, but reset DECL_REGISTER since it
4701 cannot actually go in a register. */
4702 int was_reg = C_DECL_REGISTER (decl);
4703 C_DECL_REGISTER (decl) = 0;
4704 DECL_REGISTER (decl) = 0;
4705 c_mark_addressable (decl);
4706 C_DECL_REGISTER (decl) = was_reg;
4709 #ifdef ENABLE_CHECKING
4710 /* This is the earliest point at which we might know the assembler
4711 name of a variable. Thus, if it's known before this, die horribly. */
4712 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4716 decl_attributes (&decl, returned_attrs, 0);
4722 /* Decode the parameter-list info for a function type or function definition.
4723 The argument is the value returned by `get_parm_info' (or made in parse.y
4724 if there is an identifier list instead of a parameter decl list).
4725 These two functions are separate because when a function returns
4726 or receives functions then each is called multiple times but the order
4727 of calls is different. The last call to `grokparms' is always the one
4728 that contains the formal parameter names of a function definition.
4730 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4732 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4733 a mere declaration. A nonempty identifier-list gets an error message
4734 when FUNCDEF_FLAG is zero. */
4737 grokparms (tree arg_info, int funcdef_flag)
4739 tree arg_types = ARG_INFO_TYPES (arg_info);
4741 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4742 && !in_system_header)
4743 warning ("function declaration isn't a prototype");
4745 if (arg_types == error_mark_node)
4746 return 0; /* don't set TYPE_ARG_TYPES in this case */
4748 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4751 pedwarn ("parameter names (without types) in function declaration");
4753 ARG_INFO_PARMS (arg_info) = ARG_INFO_TYPES (arg_info);
4754 ARG_INFO_TYPES (arg_info) = 0;
4759 tree parm, type, typelt;
4760 unsigned int parmno;
4762 /* If the arg types are incomplete in a declaration, they must
4763 include undefined tags. These tags can never be defined in
4764 the scope of the declaration, so the types can never be
4765 completed, and no call can be compiled successfully. */
4767 for (parm = ARG_INFO_PARMS (arg_info), typelt = arg_types, parmno = 1;
4769 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4771 type = TREE_VALUE (typelt);
4772 if (type == error_mark_node)
4775 if (!COMPLETE_TYPE_P (type))
4779 if (DECL_NAME (parm))
4780 error ("%Jparameter %u ('%D') has incomplete type",
4781 parm, parmno, parm);
4783 error ("%Jparameter %u has incomplete type",
4786 TREE_VALUE (typelt) = error_mark_node;
4787 TREE_TYPE (parm) = error_mark_node;
4791 if (DECL_NAME (parm))
4792 warning ("%Jparameter %u ('%D') has incomplete type",
4793 parm, parmno, parm);
4795 warning ("%Jparameter %u has incomplete type",
4804 /* Take apart the current scope and return a tree_list node with info
4805 on a parameter list just parsed. This tree_list node should be
4806 examined using the ARG_INFO_* macros, defined above:
4808 ARG_INFO_PARMS: a list of parameter decls.
4809 ARG_INFO_TAGS: a list of structure, union and enum tags defined.
4810 ARG_INFO_TYPES: a list of argument types to go in the FUNCTION_TYPE.
4811 ARG_INFO_OTHERS: a list of non-parameter decls (notably enumeration
4812 constants) defined with the parameters.
4814 This tree_list node is later fed to 'grokparms' and 'store_parm_decls'.
4816 ELLIPSIS being true means the argument list ended in '...' so don't
4817 append a sentinel (void_list_node) to the end of the type-list. */
4820 get_parm_info (bool ellipsis)
4822 struct c_binding *b = current_scope->bindings;
4823 tree arg_info = make_node (TREE_LIST);
4829 static bool explained_incomplete_types = false;
4830 bool gave_void_only_once_err = false;
4832 /* The bindings in this scope must not get put into a block.
4833 We will take care of deleting the binding nodes. */
4834 current_scope->bindings = 0;
4836 /* This function is only called if there was *something* on the
4838 #ifdef ENABLE_CHECKING
4843 /* A parameter list consisting solely of 'void' indicates that the
4844 function takes no arguments. But if the 'void' is qualified
4845 (by 'const' or 'volatile'), or has a storage class specifier
4846 ('register'), then the behavior is undefined; issue an error.
4847 Typedefs for 'void' are OK (see DR#157). */
4848 if (b->prev == 0 /* one binding */
4849 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4850 && !DECL_NAME (b->decl) /* anonymous */
4851 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4853 if (TREE_THIS_VOLATILE (b->decl)
4854 || TREE_READONLY (b->decl)
4855 || C_DECL_REGISTER (b->decl))
4856 error ("'void' as only parameter may not be qualified");
4858 /* There cannot be an ellipsis. */
4860 error ("'void' must be the only parameter");
4862 ARG_INFO_TYPES (arg_info) = void_list_node;
4867 types = void_list_node;
4869 /* Break up the bindings list into parms, tags, types, and others;
4870 apply sanity checks; purge the name-to-decl bindings. */
4873 tree decl = b->decl;
4874 tree type = TREE_TYPE (decl);
4875 const char *keyword;
4877 switch (TREE_CODE (decl))
4882 #ifdef ENABLE_CHECKING
4883 if (I_SYMBOL_BINDING (b->id) != b) abort ();
4885 I_SYMBOL_BINDING (b->id) = b->shadowed;
4888 /* Check for forward decls that never got their actual decl. */
4889 if (TREE_ASM_WRITTEN (decl))
4890 error ("%Jparameter '%D' has just a forward declaration",
4892 /* Check for (..., void, ...) and issue an error. */
4893 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4895 if (!gave_void_only_once_err)
4897 error ("'void' must be the only parameter");
4898 gave_void_only_once_err = true;
4903 /* Valid parameter, add it to the list. */
4904 TREE_CHAIN (decl) = parms;
4907 /* Since there is a prototype, args are passed in their
4908 declared types. The back end may override this later. */
4909 DECL_ARG_TYPE (decl) = type;
4910 types = tree_cons (0, type, types);
4914 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4915 case UNION_TYPE: keyword = "union"; goto tag;
4916 case RECORD_TYPE: keyword = "struct"; goto tag;
4918 /* Types may not have tag-names, in which case the type
4919 appears in the bindings list with b->id NULL. */
4922 #ifdef ENABLE_CHECKING
4923 if (I_TAG_BINDING (b->id) != b) abort ();
4925 I_TAG_BINDING (b->id) = b->shadowed;
4928 /* Warn about any struct, union or enum tags defined in a
4929 parameter list. The scope of such types is limited to
4930 the parameter list, which is rarely if ever desirable
4931 (it's impossible to call such a function with type-
4932 correct arguments). An anonymous union parm type is
4933 meaningful as a GNU extension, so don't warn for that. */
4934 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4937 /* The %s will be one of 'struct', 'union', or 'enum'. */
4938 warning ("'%s %E' declared inside parameter list",
4941 /* The %s will be one of 'struct', 'union', or 'enum'. */
4942 warning ("anonymous %s declared inside parameter list",
4945 if (! explained_incomplete_types)
4947 warning ("its scope is only this definition or declaration,"
4948 " which is probably not what you want");
4949 explained_incomplete_types = true;
4953 tags = tree_cons (b->id, decl, tags);
4958 /* CONST_DECLs appear here when we have an embedded enum,
4959 and TYPE_DECLs appear here when we have an embedded struct
4960 or union. No warnings for this - we already warned about the
4962 TREE_CHAIN (decl) = others;
4967 /* error_mark_node appears here when we have an undeclared
4968 variable. Just throw it away. */
4971 #ifdef ENABLE_CHECKING
4972 if (I_SYMBOL_BINDING (b->id) != b) abort ();
4974 I_SYMBOL_BINDING (b->id) = b->shadowed;
4978 /* Other things that might be encountered. */
4986 b = free_binding_and_advance (b);
4989 ARG_INFO_PARMS (arg_info) = parms;
4990 ARG_INFO_TAGS (arg_info) = tags;
4991 ARG_INFO_TYPES (arg_info) = types;
4992 ARG_INFO_OTHERS (arg_info) = others;
4996 /* Get the struct, enum or union (CODE says which) with tag NAME.
4997 Define the tag as a forward-reference if it is not defined. */
5000 xref_tag (enum tree_code code, tree name)
5002 /* If a cross reference is requested, look up the type
5003 already defined for this tag and return it. */
5005 tree ref = lookup_tag (code, name, 0);
5006 /* If this is the right type of tag, return what we found.
5007 (This reference will be shadowed by shadow_tag later if appropriate.)
5008 If this is the wrong type of tag, do not return it. If it was the
5009 wrong type in the same scope, we will have had an error
5010 message already; if in a different scope and declaring
5011 a name, pending_xref_error will give an error message; but if in a
5012 different scope and not declaring a name, this tag should
5013 shadow the previous declaration of a different type of tag, and
5014 this would not work properly if we return the reference found.
5015 (For example, with "struct foo" in an outer scope, "union foo;"
5016 must shadow that tag with a new one of union type.) */
5017 if (ref && TREE_CODE (ref) == code)
5020 /* If no such tag is yet defined, create a forward-reference node
5021 and record it as the "definition".
5022 When a real declaration of this type is found,
5023 the forward-reference will be altered into a real type. */
5025 ref = make_node (code);
5026 if (code == ENUMERAL_TYPE)
5028 /* Give the type a default layout like unsigned int
5029 to avoid crashing if it does not get defined. */
5030 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5031 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5032 TYPE_USER_ALIGN (ref) = 0;
5033 TYPE_UNSIGNED (ref) = 1;
5034 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5035 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5036 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5039 pushtag (name, ref);
5044 /* Make sure that the tag NAME is defined *in the current scope*
5045 at least as a forward reference.
5046 CODE says which kind of tag NAME ought to be. */
5049 start_struct (enum tree_code code, tree name)
5051 /* If there is already a tag defined at this scope
5052 (as a forward reference), just return it. */
5057 ref = lookup_tag (code, name, 1);
5058 if (ref && TREE_CODE (ref) == code)
5060 if (TYPE_FIELDS (ref))
5062 if (code == UNION_TYPE)
5063 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
5065 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
5070 /* Otherwise create a forward-reference just so the tag is in scope. */
5072 ref = make_node (code);
5073 pushtag (name, ref);
5076 C_TYPE_BEING_DEFINED (ref) = 1;
5077 TYPE_PACKED (ref) = flag_pack_struct;
5081 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5082 of a structure component, returning a FIELD_DECL node.
5083 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5085 This is done during the parsing of the struct declaration.
5086 The FIELD_DECL nodes are chained together and the lot of them
5087 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5090 grokfield (tree declarator, tree declspecs, tree width)
5094 if (declarator == NULL_TREE && width == NULL_TREE)
5096 /* This is an unnamed decl.
5098 If we have something of the form "union { list } ;" then this
5099 is the anonymous union extension. Similarly for struct.
5101 If this is something of the form "struct foo;", then
5102 If MS extensions are enabled, this is handled as an
5104 Otherwise this is a forward declaration of a structure tag.
5106 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5107 If MS extensions are enabled and foo names a structure, then
5108 again this is an anonymous struct.
5109 Otherwise this is an error.
5111 Oh what a horrid tangled web we weave. I wonder if MS consciously
5112 took this from Plan 9 or if it was an accident of implementation
5113 that took root before someone noticed the bug... */
5115 tree type = TREE_VALUE (declspecs);
5117 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
5118 type = TREE_TYPE (type);
5119 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
5121 if (flag_ms_extensions)
5124 goto warn_unnamed_field;
5125 else if (TYPE_NAME (type) == NULL)
5128 goto warn_unnamed_field;
5133 warning ("declaration does not declare anything");
5138 value = grokdeclarator (declarator, declspecs, FIELD, 0,
5139 width ? &width : NULL);
5141 finish_decl (value, NULL_TREE, NULL_TREE);
5142 DECL_INITIAL (value) = width;
5147 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5148 the list such that this does not present a problem later. */
5151 detect_field_duplicates (tree fieldlist)
5156 /* First, see if there are more than "a few" fields.
5157 This is trivially true if there are zero or one fields. */
5160 x = TREE_CHAIN (fieldlist);
5166 } while (timeout > 0 && x);
5168 /* If there were "few" fields, avoid the overhead of allocating
5169 a hash table. Instead just do the nested traversal thing. */
5172 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5175 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5176 if (DECL_NAME (y) == DECL_NAME (x))
5178 error ("%Jduplicate member '%D'", x, x);
5179 DECL_NAME (x) = NULL_TREE;
5185 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5188 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5189 if ((y = DECL_NAME (x)) != 0)
5191 slot = htab_find_slot (htab, y, INSERT);
5194 error ("%Jduplicate member '%D'", x, x);
5195 DECL_NAME (x) = NULL_TREE;
5204 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5205 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5206 ATTRIBUTES are attributes to be applied to the structure. */
5209 finish_struct (tree t, tree fieldlist, tree attributes)
5212 bool toplevel = file_scope == current_scope;
5213 int saw_named_field;
5215 /* If this type was previously laid out as a forward reference,
5216 make sure we lay it out again. */
5220 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5224 for (x = fieldlist; x; x = TREE_CHAIN (x))
5225 if (DECL_NAME (x) != 0)
5229 pedwarn ("%s has no %s",
5230 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5231 fieldlist ? _("named members") : _("members"));
5234 /* Install struct as DECL_CONTEXT of each field decl.
5235 Also process specified field sizes, found in the DECL_INITIAL,
5236 storing 0 there after the type has been changed to precision equal
5237 to its width, rather than the precision of the specified standard
5238 type. (Correct layout requires the original type to have been preserved
5241 saw_named_field = 0;
5242 for (x = fieldlist; x; x = TREE_CHAIN (x))
5244 DECL_CONTEXT (x) = t;
5245 DECL_PACKED (x) |= TYPE_PACKED (t);
5247 /* If any field is const, the structure type is pseudo-const. */
5248 if (TREE_READONLY (x))
5249 C_TYPE_FIELDS_READONLY (t) = 1;
5252 /* A field that is pseudo-const makes the structure likewise. */
5253 tree t1 = TREE_TYPE (x);
5254 while (TREE_CODE (t1) == ARRAY_TYPE)
5255 t1 = TREE_TYPE (t1);
5256 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5257 && C_TYPE_FIELDS_READONLY (t1))
5258 C_TYPE_FIELDS_READONLY (t) = 1;
5261 /* Any field that is volatile means variables of this type must be
5262 treated in some ways as volatile. */
5263 if (TREE_THIS_VOLATILE (x))
5264 C_TYPE_FIELDS_VOLATILE (t) = 1;
5266 /* Any field of nominal variable size implies structure is too. */
5267 if (C_DECL_VARIABLE_SIZE (x))
5268 C_TYPE_VARIABLE_SIZE (t) = 1;
5270 /* Detect invalid nested redefinition. */
5271 if (TREE_TYPE (x) == t)
5272 error ("nested redefinition of `%s'",
5273 IDENTIFIER_POINTER (TYPE_NAME (t)));
5275 if (DECL_INITIAL (x))
5277 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5278 DECL_SIZE (x) = bitsize_int (width);
5279 DECL_BIT_FIELD (x) = 1;
5280 SET_DECL_C_BIT_FIELD (x);
5283 /* Detect flexible array member in an invalid context. */
5284 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5285 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5286 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5287 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5289 if (TREE_CODE (t) == UNION_TYPE)
5291 error ("%Jflexible array member in union", x);
5292 TREE_TYPE (x) = error_mark_node;
5294 else if (TREE_CHAIN (x) != NULL_TREE)
5296 error ("%Jflexible array member not at end of struct", x);
5297 TREE_TYPE (x) = error_mark_node;
5299 else if (! saw_named_field)
5301 error ("%Jflexible array member in otherwise empty struct", x);
5302 TREE_TYPE (x) = error_mark_node;
5306 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5307 && flexible_array_type_p (TREE_TYPE (x)))
5308 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5311 saw_named_field = 1;
5314 detect_field_duplicates (fieldlist);
5316 /* Now we have the nearly final fieldlist. Record it,
5317 then lay out the structure or union (including the fields). */
5319 TYPE_FIELDS (t) = fieldlist;
5323 /* Give bit-fields their proper types. */
5325 tree *fieldlistp = &fieldlist;
5327 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5328 && TREE_TYPE (*fieldlistp) != error_mark_node)
5330 unsigned HOST_WIDE_INT width
5331 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5332 tree type = TREE_TYPE (*fieldlistp);
5333 if (width != TYPE_PRECISION (type))
5334 TREE_TYPE (*fieldlistp)
5335 = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
5336 DECL_INITIAL (*fieldlistp) = 0;
5339 fieldlistp = &TREE_CHAIN (*fieldlistp);
5342 /* Now we have the truly final field list.
5343 Store it in this type and in the variants. */
5345 TYPE_FIELDS (t) = fieldlist;
5347 /* If there are lots of fields, sort so we can look through them fast.
5348 We arbitrarily consider 16 or more elts to be "a lot". */
5353 for (x = fieldlist; x; x = TREE_CHAIN (x))
5355 if (len > 15 || DECL_NAME (x) == NULL)
5363 struct lang_type *space;
5364 struct sorted_fields_type *space2;
5366 len += list_length (x);
5368 /* Use the same allocation policy here that make_node uses, to
5369 ensure that this lives as long as the rest of the struct decl.
5370 All decls in an inline function need to be saved. */
5372 space = GGC_CNEW (struct lang_type);
5373 space2 = GGC_NEWVAR (struct sorted_fields_type,
5374 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5378 field_array = &space2->elts[0];
5379 for (x = fieldlist; x; x = TREE_CHAIN (x))
5381 field_array[len++] = x;
5383 /* If there is anonymous struct or union, break out of the loop. */
5384 if (DECL_NAME (x) == NULL)
5387 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5390 TYPE_LANG_SPECIFIC (t) = space;
5391 TYPE_LANG_SPECIFIC (t)->s->len = len;
5392 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5393 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5398 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5400 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5401 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5402 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5403 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5406 /* If this was supposed to be a transparent union, but we can't
5407 make it one, warn and turn off the flag. */
5408 if (TREE_CODE (t) == UNION_TYPE
5409 && TYPE_TRANSPARENT_UNION (t)
5410 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5412 TYPE_TRANSPARENT_UNION (t) = 0;
5413 warning ("union cannot be made transparent");
5416 /* If this structure or union completes the type of any previous
5417 variable declaration, lay it out and output its rtl. */
5418 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5422 tree decl = TREE_VALUE (x);
5423 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5424 layout_array_type (TREE_TYPE (decl));
5425 if (TREE_CODE (decl) != TYPE_DECL)
5427 layout_decl (decl, 0);
5428 if (c_dialect_objc ())
5429 objc_check_decl (decl);
5430 rest_of_decl_compilation (decl, toplevel, 0);
5435 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5437 /* Finish debugging output for this type. */
5438 rest_of_type_compilation (t, toplevel);
5443 /* Lay out the type T, and its element type, and so on. */
5446 layout_array_type (tree t)
5448 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5449 layout_array_type (TREE_TYPE (t));
5453 /* Begin compiling the definition of an enumeration type.
5454 NAME is its name (or null if anonymous).
5455 Returns the type object, as yet incomplete.
5456 Also records info about it so that build_enumerator
5457 may be used to declare the individual values as they are read. */
5460 start_enum (tree name)
5464 /* If this is the real definition for a previous forward reference,
5465 fill in the contents in the same object that used to be the
5466 forward reference. */
5469 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5471 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5473 enumtype = make_node (ENUMERAL_TYPE);
5474 pushtag (name, enumtype);
5477 C_TYPE_BEING_DEFINED (enumtype) = 1;
5479 if (TYPE_VALUES (enumtype) != 0)
5481 /* This enum is a named one that has been declared already. */
5482 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5484 /* Completely replace its old definition.
5485 The old enumerators remain defined, however. */
5486 TYPE_VALUES (enumtype) = 0;
5489 enum_next_value = integer_zero_node;
5492 if (flag_short_enums)
5493 TYPE_PACKED (enumtype) = 1;
5498 /* After processing and defining all the values of an enumeration type,
5499 install their decls in the enumeration type and finish it off.
5500 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5501 and ATTRIBUTES are the specified attributes.
5502 Returns ENUMTYPE. */
5505 finish_enum (tree enumtype, tree values, tree attributes)
5508 tree minnode = 0, maxnode = 0;
5509 int precision, unsign;
5510 bool toplevel = (file_scope == current_scope);
5511 struct lang_type *lt;
5513 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5515 /* Calculate the maximum value of any enumerator in this type. */
5517 if (values == error_mark_node)
5518 minnode = maxnode = integer_zero_node;
5521 minnode = maxnode = TREE_VALUE (values);
5522 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5524 tree value = TREE_VALUE (pair);
5525 if (tree_int_cst_lt (maxnode, value))
5527 if (tree_int_cst_lt (value, minnode))
5532 /* Construct the final type of this enumeration. It is the same
5533 as one of the integral types - the narrowest one that fits, except
5534 that normally we only go as narrow as int - and signed iff any of
5535 the values are negative. */
5536 unsign = (tree_int_cst_sgn (minnode) >= 0);
5537 precision = MAX (min_precision (minnode, unsign),
5538 min_precision (maxnode, unsign));
5539 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5541 tem = c_common_type_for_size (precision, unsign);
5544 warning ("enumeration values exceed range of largest integer");
5545 tem = long_long_integer_type_node;
5549 tem = unsign ? unsigned_type_node : integer_type_node;
5551 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5552 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5553 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5554 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5555 TYPE_SIZE (enumtype) = 0;
5556 layout_type (enumtype);
5558 if (values != error_mark_node)
5560 /* Change the type of the enumerators to be the enum type. We
5561 need to do this irrespective of the size of the enum, for
5562 proper type checking. Replace the DECL_INITIALs of the
5563 enumerators, and the value slots of the list, with copies
5564 that have the enum type; they cannot be modified in place
5565 because they may be shared (e.g. integer_zero_node) Finally,
5566 change the purpose slots to point to the names of the decls. */
5567 for (pair = values; pair; pair = TREE_CHAIN (pair))
5569 tree enu = TREE_PURPOSE (pair);
5570 tree ini = DECL_INITIAL (enu);
5572 TREE_TYPE (enu) = enumtype;
5574 /* The ISO C Standard mandates enumerators to have type int,
5575 even though the underlying type of an enum type is
5576 unspecified. Here we convert any enumerators that fit in
5577 an int to type int, to avoid promotions to unsigned types
5578 when comparing integers with enumerators that fit in the
5579 int range. When -pedantic is given, build_enumerator()
5580 would have already taken care of those that don't fit. */
5581 if (int_fits_type_p (ini, integer_type_node))
5582 tem = integer_type_node;
5585 ini = convert (tem, ini);
5587 DECL_INITIAL (enu) = ini;
5588 TREE_PURPOSE (pair) = DECL_NAME (enu);
5589 TREE_VALUE (pair) = ini;
5592 TYPE_VALUES (enumtype) = values;
5595 /* Record the min/max values so that we can warn about bit-field
5596 enumerations that are too small for the values. */
5597 lt = GGC_CNEW (struct lang_type);
5598 lt->enum_min = minnode;
5599 lt->enum_max = maxnode;
5600 TYPE_LANG_SPECIFIC (enumtype) = lt;
5602 /* Fix up all variant types of this enum type. */
5603 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5605 if (tem == enumtype)
5607 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5608 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5609 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5610 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5611 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5612 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5613 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5614 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5615 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5616 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5617 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5620 /* Finish debugging output for this type. */
5621 rest_of_type_compilation (enumtype, toplevel);
5626 /* Build and install a CONST_DECL for one value of the
5627 current enumeration type (one that was begun with start_enum).
5628 Return a tree-list containing the CONST_DECL and its value.
5629 Assignment of sequential values by default is handled here. */
5632 build_enumerator (tree name, tree value)
5636 /* Validate and default VALUE. */
5638 /* Remove no-op casts from the value. */
5640 STRIP_TYPE_NOPS (value);
5644 /* Don't issue more errors for error_mark_node (i.e. an
5645 undeclared identifier) - just ignore the value expression. */
5646 if (value == error_mark_node)
5648 else if (TREE_CODE (value) != INTEGER_CST)
5650 error ("enumerator value for '%E' is not an integer constant", name);
5655 value = default_conversion (value);
5656 constant_expression_warning (value);
5660 /* Default based on previous value. */
5661 /* It should no longer be possible to have NON_LVALUE_EXPR
5665 value = enum_next_value;
5667 error ("overflow in enumeration values");
5670 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5672 pedwarn ("ISO C restricts enumerator values to range of `int'");
5673 /* XXX This causes -pedantic to change the meaning of the program.
5674 Remove? -zw 2004-03-15 */
5675 value = convert (integer_type_node, value);
5678 /* Set basis for default for next value. */
5679 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5680 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5682 /* Now create a declaration for the enum value name. */
5684 type = TREE_TYPE (value);
5685 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5686 TYPE_PRECISION (integer_type_node)),
5687 (TYPE_PRECISION (type)
5688 >= TYPE_PRECISION (integer_type_node)
5689 && TYPE_UNSIGNED (type)));
5691 decl = build_decl (CONST_DECL, name, type);
5692 DECL_INITIAL (decl) = convert (type, value);
5695 return tree_cons (decl, value, NULL_TREE);
5699 /* Create the FUNCTION_DECL for a function definition.
5700 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5701 the declaration; they describe the function's name and the type it returns,
5702 but twisted together in a fashion that parallels the syntax of C.
5704 This function creates a binding context for the function body
5705 as well as setting up the FUNCTION_DECL in current_function_decl.
5707 Returns 1 on success. If the DECLARATOR is not suitable for a function
5708 (it defines a datum instead), we return 0, which tells
5709 yyparse to report a parse error. */
5712 start_function (tree declspecs, tree declarator, tree attributes)
5714 tree decl1, old_decl;
5715 tree restype, resdecl;
5717 current_function_returns_value = 0; /* Assume, until we see it does. */
5718 current_function_returns_null = 0;
5719 current_function_returns_abnormally = 0;
5720 warn_about_return_type = 0;
5721 current_extern_inline = 0;
5722 c_switch_stack = NULL;
5724 /* Indicate no valid break/continue context by setting these variables
5725 to some non-null, non-label value. We'll notice and emit the proper
5726 error message in c_finish_bc_stmt. */
5727 c_break_label = c_cont_label = size_zero_node;
5729 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, NULL);
5731 /* If the declarator is not suitable for a function definition,
5732 cause a syntax error. */
5736 decl_attributes (&decl1, attributes, 0);
5738 if (DECL_DECLARED_INLINE_P (decl1)
5739 && DECL_UNINLINABLE (decl1)
5740 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5741 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5743 announce_function (decl1);
5745 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5747 error ("return type is an incomplete type");
5748 /* Make it return void instead. */
5750 = build_function_type (void_type_node,
5751 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5754 if (warn_about_return_type)
5755 pedwarn_c99 ("return type defaults to `int'");
5757 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5758 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5759 DECL_INITIAL (decl1) = error_mark_node;
5761 /* If this definition isn't a prototype and we had a prototype declaration
5762 before, copy the arg type info from that prototype.
5763 But not if what we had before was a builtin function. */
5764 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5765 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5766 && !DECL_BUILT_IN (old_decl)
5767 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5768 TREE_TYPE (TREE_TYPE (old_decl)))
5769 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5771 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5773 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5776 /* Optionally warn of old-fashioned def with no previous prototype. */
5777 if (warn_strict_prototypes
5778 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5779 && C_DECL_ISNT_PROTOTYPE (old_decl))
5780 warning ("function declaration isn't a prototype");
5781 /* Optionally warn of any global def with no previous prototype. */
5782 else if (warn_missing_prototypes
5783 && TREE_PUBLIC (decl1)
5784 && ! MAIN_NAME_P (DECL_NAME (decl1))
5785 && C_DECL_ISNT_PROTOTYPE (old_decl))
5786 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5787 /* Optionally warn of any def with no previous prototype
5788 if the function has already been used. */
5789 else if (warn_missing_prototypes
5790 && old_decl != 0 && TREE_USED (old_decl)
5791 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5792 warning ("%J'%D' was used with no prototype before its definition",
5794 /* Optionally warn of any global def with no previous declaration. */
5795 else if (warn_missing_declarations
5796 && TREE_PUBLIC (decl1)
5798 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5799 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5800 /* Optionally warn of any def with no previous declaration
5801 if the function has already been used. */
5802 else if (warn_missing_declarations
5803 && old_decl != 0 && TREE_USED (old_decl)
5804 && C_DECL_IMPLICIT (old_decl))
5805 warning ("%J`%D' was used with no declaration before its definition",
5808 /* This is a definition, not a reference.
5809 So normally clear DECL_EXTERNAL.
5810 However, `extern inline' acts like a declaration
5811 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5812 DECL_EXTERNAL (decl1) = current_extern_inline;
5814 /* This function exists in static storage.
5815 (This does not mean `static' in the C sense!) */
5816 TREE_STATIC (decl1) = 1;
5818 /* A nested function is not global. */
5819 if (current_function_decl != 0)
5820 TREE_PUBLIC (decl1) = 0;
5822 #ifdef ENABLE_CHECKING
5823 /* This is the earliest point at which we might know the assembler
5824 name of the function. Thus, if it's set before this, die horribly. */
5825 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5829 /* If #pragma weak was used, mark the decl weak now. */
5830 if (current_scope == file_scope)
5831 maybe_apply_pragma_weak (decl1);
5833 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5834 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5839 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5840 != integer_type_node)
5841 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5843 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5844 args = TREE_CHAIN (args))
5846 tree type = args ? TREE_VALUE (args) : 0;
5848 if (type == void_type_node)
5855 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5856 pedwarn ("%Jfirst argument of '%D' should be `int'",
5861 if (TREE_CODE (type) != POINTER_TYPE
5862 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5863 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5865 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5870 if (TREE_CODE (type) != POINTER_TYPE
5871 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5872 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5874 pedwarn ("%Jthird argument of '%D' should probably be "
5875 "'char **'", decl1, decl1);
5880 /* It is intentional that this message does not mention the third
5881 argument because it's only mentioned in an appendix of the
5883 if (argct > 0 && (argct < 2 || argct > 3))
5884 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5886 if (! TREE_PUBLIC (decl1))
5887 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5890 /* Record the decl so that the function name is defined.
5891 If we already have a decl for this name, and it is a FUNCTION_DECL,
5892 use the old decl. */
5894 current_function_decl = pushdecl (decl1);
5897 declare_parm_level ();
5899 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5900 /* Promote the value to int before returning it. */
5901 if (c_promoting_integer_type_p (restype))
5903 /* It retains unsignedness if not really getting wider. */
5904 if (TYPE_UNSIGNED (restype)
5905 && (TYPE_PRECISION (restype)
5906 == TYPE_PRECISION (integer_type_node)))
5907 restype = unsigned_type_node;
5909 restype = integer_type_node;
5912 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
5913 DECL_ARTIFICIAL (resdecl) = 1;
5914 DECL_IGNORED_P (resdecl) = 1;
5915 DECL_RESULT (current_function_decl) = resdecl;
5917 start_fname_decls ();
5922 /* Subroutine of store_parm_decls which handles new-style function
5923 definitions (prototype format). The parms already have decls, so we
5924 need only record them as in effect and complain if any redundant
5925 old-style parm decls were written. */
5927 store_parm_decls_newstyle (tree fndecl, tree arg_info)
5930 tree parms = ARG_INFO_PARMS (arg_info);
5931 tree tags = ARG_INFO_TAGS (arg_info);
5932 tree others = ARG_INFO_OTHERS (arg_info);
5934 if (current_scope->bindings)
5936 error ("%Jold-style parameter declarations in prototyped "
5937 "function definition", fndecl);
5939 /* Get rid of the old-style declarations. */
5943 /* Don't issue this warning for nested functions, and don't issue this
5944 warning if we got here because ARG_INFO_TYPES was error_mark_node
5945 (this happens when a function definition has just an ellipsis in
5946 its parameter list). */
5947 else if (warn_traditional && !in_system_header && !current_function_scope
5948 && ARG_INFO_TYPES (arg_info) != error_mark_node)
5949 warning ("%Jtraditional C rejects ISO C style function definitions",
5952 /* Now make all the parameter declarations visible in the function body.
5953 We can bypass most of the grunt work of pushdecl. */
5954 for (decl = parms; decl; decl = TREE_CHAIN (decl))
5956 DECL_CONTEXT (decl) = current_function_decl;
5957 if (DECL_NAME (decl))
5958 bind (DECL_NAME (decl), decl, current_scope,
5959 /*invisible=*/false, /*nested=*/false);
5961 error ("%Jparameter name omitted", decl);
5964 /* Record the parameter list in the function declaration. */
5965 DECL_ARGUMENTS (fndecl) = parms;
5967 /* Now make all the ancillary declarations visible, likewise. */
5968 for (decl = others; decl; decl = TREE_CHAIN (decl))
5970 DECL_CONTEXT (decl) = current_function_decl;
5971 if (DECL_NAME (decl))
5972 bind (DECL_NAME (decl), decl, current_scope,
5973 /*invisible=*/false, /*nested=*/false);
5976 /* And all the tag declarations. */
5977 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5978 if (TREE_PURPOSE (decl))
5979 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
5980 /*invisible=*/false, /*nested=*/false);
5983 /* Subroutine of store_parm_decls which handles old-style function
5984 definitions (separate parameter list and declarations). */
5987 store_parm_decls_oldstyle (tree fndecl, tree arg_info)
5989 struct c_binding *b;
5990 tree parm, decl, last;
5991 tree parmids = ARG_INFO_PARMS (arg_info);
5993 /* We use DECL_WEAK as a flag to show which parameters have been
5994 seen already, since it is not used on PARM_DECL. */
5995 #ifdef ENABLE_CHECKING
5996 for (b = current_scope->bindings; b; b = b->prev)
5997 if (TREE_CODE (b->decl) == PARM_DECL && DECL_WEAK (b->decl))
6001 if (warn_old_style_definition && !in_system_header)
6002 warning ("%Jold-style function definition", fndecl);
6004 /* Match each formal parameter name with its declaration. Save each
6005 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6006 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6008 if (TREE_VALUE (parm) == 0)
6010 error ("%Jparameter name missing from parameter list", fndecl);
6011 TREE_PURPOSE (parm) = 0;
6015 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6016 if (b && B_IN_CURRENT_SCOPE (b))
6019 /* If we got something other than a PARM_DECL it is an error. */
6020 if (TREE_CODE (decl) != PARM_DECL)
6021 error ("%J'%D' declared as a non-parameter", decl, decl);
6022 /* If the declaration is already marked, we have a duplicate
6023 name. Complain and ignore the duplicate. */
6024 else if (DECL_WEAK (decl))
6026 error ("%Jmultiple parameters named '%D'", decl, decl);
6027 TREE_PURPOSE (parm) = 0;
6030 /* If the declaration says "void", complain and turn it into
6032 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6034 error ("%Jparameter '%D' declared with void type", decl, decl);
6035 TREE_TYPE (decl) = integer_type_node;
6036 DECL_ARG_TYPE (decl) = integer_type_node;
6037 layout_decl (decl, 0);
6040 /* If no declaration found, default to int. */
6043 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6044 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6045 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6049 pedwarn ("%Jtype of '%D' defaults to 'int'", decl, decl);
6050 else if (extra_warnings)
6051 warning ("%Jtype of '%D' defaults to 'int'", decl, decl);
6054 TREE_PURPOSE (parm) = decl;
6055 DECL_WEAK (decl) = 1;
6058 /* Now examine the parms chain for incomplete declarations
6059 and declarations with no corresponding names. */
6061 for (b = current_scope->bindings; b; b = b->prev)
6064 if (TREE_CODE (parm) != PARM_DECL)
6067 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6069 error ("%Jparameter '%D' has incomplete type", parm, parm);
6070 TREE_TYPE (parm) = error_mark_node;
6073 if (! DECL_WEAK (parm))
6075 error ("%Jdeclaration for parameter '%D' but no such parameter",
6078 /* Pretend the parameter was not missing.
6079 This gets us to a standard state and minimizes
6080 further error messages. */
6081 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6085 /* Chain the declarations together in the order of the list of
6086 names. Store that chain in the function decl, replacing the
6087 list of names. Update the current scope to match. */
6088 DECL_ARGUMENTS (fndecl) = 0;
6090 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6091 if (TREE_PURPOSE (parm))
6093 if (parm && TREE_PURPOSE (parm))
6095 last = TREE_PURPOSE (parm);
6096 DECL_ARGUMENTS (fndecl) = last;
6097 DECL_WEAK (last) = 0;
6099 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6100 if (TREE_PURPOSE (parm))
6102 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6103 last = TREE_PURPOSE (parm);
6104 DECL_WEAK (last) = 0;
6106 TREE_CHAIN (last) = 0;
6109 /* If there was a previous prototype,
6110 set the DECL_ARG_TYPE of each argument according to
6111 the type previously specified, and report any mismatches. */
6113 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6116 for (parm = DECL_ARGUMENTS (fndecl),
6117 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6118 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6119 != void_type_node));
6120 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6122 if (parm == 0 || type == 0
6123 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6125 error ("number of arguments doesn't match prototype");
6126 error ("%Hprototype declaration",
6127 ¤t_function_prototype_locus);
6130 /* Type for passing arg must be consistent with that
6131 declared for the arg. ISO C says we take the unqualified
6132 type for parameters declared with qualified type. */
6133 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6134 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6136 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6137 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6139 /* Adjust argument to match prototype. E.g. a previous
6140 `int foo(float);' prototype causes
6141 `int foo(x) float x; {...}' to be treated like
6142 `int foo(float x) {...}'. This is particularly
6143 useful for argument types like uid_t. */
6144 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6146 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6147 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6148 && TYPE_PRECISION (TREE_TYPE (parm))
6149 < TYPE_PRECISION (integer_type_node))
6150 DECL_ARG_TYPE (parm) = integer_type_node;
6154 pedwarn ("promoted argument '%D' "
6155 "doesn't match prototype", parm);
6156 pedwarn ("%Hprototype declaration",
6157 ¤t_function_prototype_locus);
6162 error ("argument '%D' doesn't match prototype", parm);
6163 error ("%Hprototype declaration",
6164 ¤t_function_prototype_locus);
6168 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6171 /* Otherwise, create a prototype that would match. */
6175 tree actual = 0, last = 0, type;
6177 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6179 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6181 TREE_CHAIN (last) = type;
6186 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6188 TREE_CHAIN (last) = type;
6192 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6193 of the type of this function, but we need to avoid having this
6194 affect the types of other similarly-typed functions, so we must
6195 first force the generation of an identical (but separate) type
6196 node for the relevant function type. The new node we create
6197 will be a variant of the main variant of the original function
6200 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6202 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6206 /* Store the parameter declarations into the current function declaration.
6207 This is called after parsing the parameter declarations, before
6208 digesting the body of the function.
6210 For an old-style definition, construct a prototype out of the old-style
6211 parameter declarations and inject it into the function's type. */
6214 store_parm_decls (void)
6216 tree fndecl = current_function_decl;
6218 /* The argument information block for FNDECL. */
6219 tree arg_info = DECL_ARGUMENTS (fndecl);
6221 /* True if this definition is written with a prototype. Note:
6222 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6223 list in a function definition as equivalent to (void) -- an
6224 empty argument list specifies the function has no parameters,
6225 but only (void) sets up a prototype for future calls. */
6226 bool proto = ARG_INFO_TYPES (arg_info) != 0;
6229 store_parm_decls_newstyle (fndecl, arg_info);
6231 store_parm_decls_oldstyle (fndecl, arg_info);
6233 /* The next call to push_scope will be a function body. */
6235 next_is_function_body = true;
6237 /* Write a record describing this function definition to the prototypes
6238 file (if requested). */
6240 gen_aux_info_record (fndecl, 1, 0, proto);
6242 /* Initialize the RTL code for the function. */
6243 allocate_struct_function (fndecl);
6245 /* Begin the statement tree for this function. */
6246 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6248 /* ??? Insert the contents of the pending sizes list into the function
6249 to be evaluated. This just changes mis-behaviour until assign_parms
6250 phase ordering problems are resolved. */
6253 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6254 add_stmt (TREE_VALUE (t));
6257 /* Even though we're inside a function body, we still don't want to
6258 call expand_expr to calculate the size of a variable-sized array.
6259 We haven't necessarily assigned RTL to all variables yet, so it's
6260 not safe to try to expand expressions involving them. */
6261 cfun->x_dont_save_pending_sizes_p = 1;
6264 /* Give FNDECL and all its nested functions to cgraph for compilation. */
6267 c_finalize (tree fndecl)
6269 struct cgraph_node *cgn;
6271 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6272 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6274 /* ??? Objc emits functions after finalizing the compilation unit.
6275 This should be cleaned up later and this conditional removed. */
6276 if (cgraph_global_info_ready)
6278 c_expand_body (fndecl);
6282 /* Finalize all nested functions now. */
6283 cgn = cgraph_node (fndecl);
6284 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6285 c_finalize (cgn->decl);
6287 cgraph_finalize_function (fndecl, false);
6290 /* Finish up a function declaration and compile that function
6291 all the way to assembler language output. The free the storage
6292 for the function definition.
6294 This is called after parsing the body of the function definition. */
6297 finish_function (void)
6299 tree fndecl = current_function_decl;
6301 if (TREE_CODE (fndecl) == FUNCTION_DECL
6302 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6304 tree args = DECL_ARGUMENTS (fndecl);
6305 for (; args; args = TREE_CHAIN (args))
6307 tree type = TREE_TYPE (args);
6308 if (INTEGRAL_TYPE_P (type)
6309 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6310 DECL_ARG_TYPE (args) = integer_type_node;
6314 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6315 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6317 /* Must mark the RESULT_DECL as being in this function. */
6319 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6320 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6322 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6324 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6325 != integer_type_node)
6327 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6328 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6330 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6335 c_finish_return (integer_zero_node);
6339 /* Tie off the statement tree for this function. */
6340 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6342 finish_fname_decls ();
6344 /* Complain if there's just no return statement. */
6345 if (warn_return_type
6346 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6347 && !current_function_returns_value && !current_function_returns_null
6348 /* Don't complain if we abort. */
6349 && !current_function_returns_abnormally
6350 /* Don't warn for main(). */
6351 && !MAIN_NAME_P (DECL_NAME (fndecl))
6352 /* Or if they didn't actually specify a return type. */
6353 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6354 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6355 inline function, as we might never be compiled separately. */
6356 && DECL_INLINE (fndecl))
6357 warning ("no return statement in function returning non-void");
6359 /* With just -Wextra, complain only if function returns both with
6360 and without a value. */
6362 && current_function_returns_value
6363 && current_function_returns_null)
6364 warning ("this function may return with or without a value");
6366 /* Store the end of the function, so that we get good line number
6367 info for the epilogue. */
6368 cfun->function_end_locus = input_location;
6370 /* If we don't have ctors/dtors sections, and this is a static
6371 constructor or destructor, it must be recorded now. */
6372 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6373 && !targetm.have_ctors_dtors)
6374 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6375 if (DECL_STATIC_DESTRUCTOR (fndecl)
6376 && !targetm.have_ctors_dtors)
6377 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6379 /* Finalize the ELF visibility for the function. */
6380 c_determine_visibility (fndecl);
6382 /* Genericize before inlining. Delay genericizing nested functions
6383 until their parent function is genericized. Since finalizing
6384 requires GENERIC, delay that as well. */
6386 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6388 if (!decl_function_context (fndecl))
6390 c_genericize (fndecl);
6391 lower_nested_functions (fndecl);
6392 c_finalize (fndecl);
6396 /* Register this function with cgraph just far enough to get it
6397 added to our parent's nested function list. Handy, since the
6398 C front end doesn't have such a list. */
6399 (void) cgraph_node (fndecl);
6403 /* We're leaving the context of this function, so zap cfun.
6404 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6405 tree_rest_of_compilation. */
6407 current_function_decl = NULL;
6410 /* Generate the RTL for the body of FNDECL. */
6413 c_expand_body (tree fndecl)
6416 if (!DECL_INITIAL (fndecl)
6417 || DECL_INITIAL (fndecl) == error_mark_node)
6420 tree_rest_of_compilation (fndecl, false);
6422 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6423 && targetm.have_ctors_dtors)
6424 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6425 DEFAULT_INIT_PRIORITY);
6426 if (DECL_STATIC_DESTRUCTOR (fndecl)
6427 && targetm.have_ctors_dtors)
6428 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6429 DEFAULT_INIT_PRIORITY);
6432 /* Check the declarations given in a for-loop for satisfying the C99
6435 check_for_loop_decls (void)
6437 struct c_binding *b;
6441 /* If we get here, declarations have been used in a for loop without
6442 the C99 for loop scope. This doesn't make much sense, so don't
6444 error ("'for' loop initial declaration used outside C99 mode");
6447 /* C99 subclause 6.8.5 paragraph 3:
6449 [#3] The declaration part of a for statement shall only
6450 declare identifiers for objects having storage class auto or
6453 It isn't clear whether, in this sentence, "identifiers" binds to
6454 "shall only declare" or to "objects" - that is, whether all identifiers
6455 declared must be identifiers for objects, or whether the restriction
6456 only applies to those that are. (A question on this in comp.std.c
6457 in November 2000 received no answer.) We implement the strictest
6458 interpretation, to avoid creating an extension which later causes
6461 for (b = current_scope->bindings; b; b = b->prev)
6464 tree decl = b->decl;
6469 switch (TREE_CODE (decl))
6472 if (TREE_STATIC (decl))
6473 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6474 "initial declaration", decl, decl);
6475 else if (DECL_EXTERNAL (decl))
6476 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6477 "initial declaration", decl, decl);
6481 error ("'struct %E' declared in 'for' loop initial declaration", id);
6484 error ("'union %E' declared in 'for' loop initial declaration", id);
6487 error ("'enum %E' declared in 'for' loop initial declaration", id);
6490 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6491 "initial declaration", decl, decl);
6496 /* Save and reinitialize the variables
6497 used during compilation of a C function. */
6500 c_push_function_context (struct function *f)
6502 struct language_function *p;
6503 p = GGC_NEW (struct language_function);
6506 p->base.x_stmt_tree = c_stmt_tree;
6507 p->x_break_label = c_break_label;
6508 p->x_cont_label = c_cont_label;
6509 p->x_switch_stack = c_switch_stack;
6510 p->returns_value = current_function_returns_value;
6511 p->returns_null = current_function_returns_null;
6512 p->returns_abnormally = current_function_returns_abnormally;
6513 p->warn_about_return_type = warn_about_return_type;
6514 p->extern_inline = current_extern_inline;
6517 /* Restore the variables used during compilation of a C function. */
6520 c_pop_function_context (struct function *f)
6522 struct language_function *p = f->language;
6524 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6525 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6527 /* Stop pointing to the local nodes about to be freed. */
6528 /* But DECL_INITIAL must remain nonzero so we know this
6529 was an actual function definition. */
6530 DECL_INITIAL (current_function_decl) = error_mark_node;
6531 DECL_ARGUMENTS (current_function_decl) = 0;
6534 c_stmt_tree = p->base.x_stmt_tree;
6535 c_break_label = p->x_break_label;
6536 c_cont_label = p->x_cont_label;
6537 c_switch_stack = p->x_switch_stack;
6538 current_function_returns_value = p->returns_value;
6539 current_function_returns_null = p->returns_null;
6540 current_function_returns_abnormally = p->returns_abnormally;
6541 warn_about_return_type = p->warn_about_return_type;
6542 current_extern_inline = p->extern_inline;
6547 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6550 c_dup_lang_specific_decl (tree decl)
6552 struct lang_decl *ld;
6554 if (!DECL_LANG_SPECIFIC (decl))
6557 ld = GGC_NEW (struct lang_decl);
6558 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6559 DECL_LANG_SPECIFIC (decl) = ld;
6562 /* The functions below are required for functionality of doing
6563 function at once processing in the C front end. Currently these
6564 functions are not called from anywhere in the C front end, but as
6565 these changes continue, that will change. */
6567 /* Returns nonzero if the current statement is a full expression,
6568 i.e. temporaries created during that statement should be destroyed
6569 at the end of the statement. */
6572 stmts_are_full_exprs_p (void)
6577 /* Returns the stmt_tree (if any) to which statements are currently
6578 being added. If there is no active statement-tree, NULL is
6582 current_stmt_tree (void)
6584 return &c_stmt_tree;
6587 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6591 anon_aggr_type_p (tree ARG_UNUSED (node))
6596 /* Dummy function in place of callback used by C++. */
6599 extract_interface_info (void)
6603 /* Return the global value of T as a symbol. */
6606 identifier_global_value (tree t)
6608 struct c_binding *b;
6610 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6611 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6617 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6618 otherwise the name is found in ridpointers from RID_INDEX. */
6621 record_builtin_type (enum rid rid_index, const char *name, tree type)
6625 id = ridpointers[(int) rid_index];
6627 id = get_identifier (name);
6628 decl = build_decl (TYPE_DECL, id, type);
6630 if (debug_hooks->type_decl)
6631 debug_hooks->type_decl (decl, false);
6634 /* Build the void_list_node (void_type_node having been created). */
6636 build_void_list_node (void)
6638 tree t = build_tree_list (NULL_TREE, void_type_node);
6642 /* Return something to represent absolute declarators containing a *.
6643 TARGET is the absolute declarator that the * contains.
6644 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6645 to apply to the pointer type, represented as identifiers, possible mixed
6648 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6649 if attributes are present) and whose type is the modifier list. */
6652 make_pointer_declarator (tree type_quals_attrs, tree target)
6655 tree itarget = target;
6656 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6657 if (attrs != NULL_TREE)
6658 itarget = tree_cons (attrs, target, NULL_TREE);
6659 return build1 (INDIRECT_REF, quals, itarget);
6662 /* Synthesize a function which calls all the global ctors or global
6663 dtors in this file. This is only used for targets which do not
6664 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
6666 build_cdtor (int method_type, tree cdtors)
6673 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
6674 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
6677 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
6680 /* Perform final processing on one file scope's declarations (or the
6681 external scope's declarations), GLOBALS. */
6683 c_write_global_declarations_1 (tree globals)
6685 size_t len = list_length (globals);
6686 tree *vec = XNEWVEC (tree, len);
6690 /* Process the decls in the order they were written. */
6691 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6694 wrapup_global_declarations (vec, len);
6695 check_global_declarations (vec, len);
6701 c_write_global_declarations (void)
6705 /* We don't want to do this if generating a PCH. */
6709 /* Don't waste time on further processing if -fsyntax-only or we've
6710 encountered errors. */
6711 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
6714 /* Close the external scope. */
6715 ext_block = pop_scope ();
6720 /* Process all file scopes in this compilation, and the external_scope,
6721 through wrapup_global_declarations and check_global_declarations. */
6722 for (t = all_translation_units; t; t = TREE_CHAIN (t))
6723 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
6724 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
6726 /* Generate functions to call static constructors and destructors
6727 for targets that do not support .ctors/.dtors sections. These
6728 functions have magic names which are detected by collect2. */
6729 build_cdtor ('I', static_ctors); static_ctors = 0;
6730 build_cdtor ('D', static_dtors); static_dtors = 0;
6732 /* We're done parsing; proceed to optimize and emit assembly.
6733 FIXME: shouldn't be the front end's responsibility to call this. */
6736 /* Presently this has to happen after cgraph_optimize.
6737 FIXME: shouldn't be the front end's responsibility to call this. */
6739 mudflap_finish_file ();
6742 #include "gt-c-decl.h"