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, bool, tree *);
387 static tree grokparms (tree, bool);
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_variant_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, false);
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 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2628 is true if the array is [*], a VLA of unspecified length which is
2629 nevertheless a complete type (not currently implemented by GCC),
2630 false 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_inner) 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, bool static_p,
2641 decl = build_nt (ARRAY_REF, NULL_TREE, expr, NULL_TREE, NULL_TREE);
2642 TREE_TYPE (decl) = quals;
2643 TREE_STATIC (decl) = (static_p ? 1 : 0);
2644 if (pedantic && !flag_isoc99)
2646 if (static_p || quals != NULL_TREE)
2647 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2649 pedwarn ("ISO C90 does not support `[*]' array declarators");
2652 warning ("GCC does not yet properly implement `[*]' array declarators");
2656 /* Set the type of an array declarator. DECL is the declarator, as
2657 constructed by build_array_declarator; TYPE is what appears on the left
2658 of the [] and goes in operand 0. ABSTRACT_P is true if it is an
2659 abstract declarator, false otherwise; this is used to reject static and
2660 type qualifiers in abstract declarators, where they are not in the
2664 set_array_declarator_inner (tree decl, tree type, bool abstract_p)
2666 TREE_OPERAND (decl, 0) = type;
2667 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2668 error ("static or type qualifiers in abstract declarator");
2672 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2675 groktypename (tree type_name)
2679 if (TREE_CODE (type_name) != TREE_LIST)
2682 split_specs_attrs (TREE_PURPOSE (type_name), &specs, &attrs);
2684 type_name = grokdeclarator (TREE_VALUE (type_name), specs, TYPENAME, false,
2687 /* Apply attributes. */
2688 decl_attributes (&type_name, attrs, 0);
2693 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2696 groktypename_in_parm_context (tree type_name)
2698 if (TREE_CODE (type_name) != TREE_LIST)
2700 return grokdeclarator (TREE_VALUE (type_name),
2701 TREE_PURPOSE (type_name),
2705 /* Decode a declarator in an ordinary declaration or data definition.
2706 This is called as soon as the type information and variable name
2707 have been parsed, before parsing the initializer if any.
2708 Here we create the ..._DECL node, fill in its type,
2709 and put it on the list of decls for the current context.
2710 The ..._DECL node is returned as the value.
2712 Exception: for arrays where the length is not specified,
2713 the type is left null, to be filled in by `finish_decl'.
2715 Function definitions do not come here; they go to start_function
2716 instead. However, external and forward declarations of functions
2717 do go through here. Structure field declarations are done by
2718 grokfield and not through here. */
2721 start_decl (tree declarator, tree declspecs, bool initialized, tree attributes)
2726 /* An object declared as __attribute__((deprecated)) suppresses
2727 warnings of uses of other deprecated items. */
2728 if (lookup_attribute ("deprecated", attributes))
2729 deprecated_state = DEPRECATED_SUPPRESS;
2731 decl = grokdeclarator (declarator, declspecs,
2732 NORMAL, initialized, NULL);
2734 deprecated_state = DEPRECATED_NORMAL;
2736 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2737 && MAIN_NAME_P (DECL_NAME (decl)))
2738 warning ("%J'%D' is usually a function", decl, decl);
2741 /* Is it valid for this decl to have an initializer at all?
2742 If not, set INITIALIZED to zero, which will indirectly
2743 tell 'finish_decl' to ignore the initializer once it is parsed. */
2744 switch (TREE_CODE (decl))
2747 error ("typedef '%D' is initialized (use __typeof__ instead)", decl);
2752 error ("function '%D' is initialized like a variable", decl);
2757 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2758 error ("parameter '%D' is initialized", decl);
2763 /* Don't allow initializations for incomplete types except for
2764 arrays which might be completed by the initialization. */
2766 /* This can happen if the array size is an undefined macro.
2767 We already gave a warning, so we don't need another one. */
2768 if (TREE_TYPE (decl) == error_mark_node)
2770 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2772 /* A complete type is ok if size is fixed. */
2774 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2775 || C_DECL_VARIABLE_SIZE (decl))
2777 error ("variable-sized object may not be initialized");
2781 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2783 error ("variable '%D' has initializer but incomplete type", decl);
2786 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2788 error ("elements of array '%D' have incomplete type", decl);
2795 if (current_scope == file_scope)
2796 TREE_STATIC (decl) = 1;
2798 /* Tell 'pushdecl' this is an initialized decl
2799 even though we don't yet have the initializer expression.
2800 Also tell 'finish_decl' it may store the real initializer. */
2801 DECL_INITIAL (decl) = error_mark_node;
2804 /* If this is a function declaration, write a record describing it to the
2805 prototypes file (if requested). */
2807 if (TREE_CODE (decl) == FUNCTION_DECL)
2808 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2810 /* ANSI specifies that a tentative definition which is not merged with
2811 a non-tentative definition behaves exactly like a definition with an
2812 initializer equal to zero. (Section 3.7.2)
2814 -fno-common gives strict ANSI behavior, though this tends to break
2815 a large body of code that grew up without this rule.
2817 Thread-local variables are never common, since there's no entrenched
2818 body of code to break, and it allows more efficient variable references
2819 in the presence of dynamic linking. */
2821 if (TREE_CODE (decl) == VAR_DECL
2823 && TREE_PUBLIC (decl)
2824 && !DECL_THREAD_LOCAL (decl)
2826 DECL_COMMON (decl) = 1;
2828 /* Set attributes here so if duplicate decl, will have proper attributes. */
2829 decl_attributes (&decl, attributes, 0);
2831 if (TREE_CODE (decl) == FUNCTION_DECL
2832 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2834 tree ce = declarator;
2836 if (TREE_CODE (ce) == INDIRECT_REF)
2837 ce = TREE_OPERAND (declarator, 0);
2838 if (TREE_CODE (ce) == CALL_EXPR)
2840 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2841 for (; args; args = TREE_CHAIN (args))
2843 tree type = TREE_TYPE (args);
2844 if (type && INTEGRAL_TYPE_P (type)
2845 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2846 DECL_ARG_TYPE (args) = integer_type_node;
2851 if (TREE_CODE (decl) == FUNCTION_DECL
2852 && DECL_DECLARED_INLINE_P (decl)
2853 && DECL_UNINLINABLE (decl)
2854 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2855 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2857 /* Add this decl to the current scope.
2858 TEM may equal DECL or it may be a previous decl of the same name. */
2859 tem = pushdecl (decl);
2862 DECL_EXTERNAL (tem) = 0;
2867 /* Finish processing of a declaration;
2868 install its initial value.
2869 If the length of an array type is not known before,
2870 it must be determined now, from the initial value, or it is an error. */
2873 finish_decl (tree decl, tree init, tree asmspec_tree)
2875 tree type = TREE_TYPE (decl);
2876 int was_incomplete = (DECL_SIZE (decl) == 0);
2877 const char *asmspec = 0;
2879 /* If a name was specified, get the string. */
2880 if (current_scope == file_scope)
2881 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2883 asmspec = TREE_STRING_POINTER (asmspec_tree);
2885 /* If `start_decl' didn't like having an initialization, ignore it now. */
2886 if (init != 0 && DECL_INITIAL (decl) == 0)
2889 /* Don't crash if parm is initialized. */
2890 if (TREE_CODE (decl) == PARM_DECL)
2894 store_init_value (decl, init);
2896 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2897 || TREE_CODE (decl) == FUNCTION_DECL
2898 || TREE_CODE (decl) == FIELD_DECL))
2899 objc_check_decl (decl);
2901 /* Deduce size of array from initialization, if not already known. */
2902 if (TREE_CODE (type) == ARRAY_TYPE
2903 && TYPE_DOMAIN (type) == 0
2904 && TREE_CODE (decl) != TYPE_DECL)
2907 = (TREE_STATIC (decl)
2908 /* Even if pedantic, an external linkage array
2909 may have incomplete type at first. */
2910 ? pedantic && !TREE_PUBLIC (decl)
2911 : !DECL_EXTERNAL (decl));
2913 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2915 /* Get the completed type made by complete_array_type. */
2916 type = TREE_TYPE (decl);
2919 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2921 else if (failure == 2)
2924 error ("%Jarray size missing in '%D'", decl, decl);
2925 /* If a `static' var's size isn't known,
2926 make it extern as well as static, so it does not get
2928 If it is not `static', then do not mark extern;
2929 finish_incomplete_decl will give it a default size
2930 and it will get allocated. */
2931 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2932 DECL_EXTERNAL (decl) = 1;
2935 /* TYPE_MAX_VALUE is always one less than the number of elements
2936 in the array, because we start counting at zero. Therefore,
2937 warn only if the value is less than zero. */
2938 else if (pedantic && TYPE_DOMAIN (type) != 0
2939 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2940 error ("%Jzero or negative size array '%D'", decl, decl);
2942 layout_decl (decl, 0);
2945 if (TREE_CODE (decl) == VAR_DECL)
2947 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2948 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2949 layout_decl (decl, 0);
2951 if (DECL_SIZE (decl) == 0
2952 /* Don't give an error if we already gave one earlier. */
2953 && TREE_TYPE (decl) != error_mark_node
2954 && (TREE_STATIC (decl)
2955 /* A static variable with an incomplete type
2956 is an error if it is initialized.
2957 Also if it is not file scope.
2958 Otherwise, let it through, but if it is not `extern'
2959 then it may cause an error message later. */
2960 ? (DECL_INITIAL (decl) != 0
2961 || !DECL_FILE_SCOPE_P (decl))
2962 /* An automatic variable with an incomplete type
2964 : !DECL_EXTERNAL (decl)))
2966 error ("%Jstorage size of '%D' isn't known", decl, decl);
2967 TREE_TYPE (decl) = error_mark_node;
2970 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2971 && DECL_SIZE (decl) != 0)
2973 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2974 constant_expression_warning (DECL_SIZE (decl));
2976 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2979 if (TREE_USED (type))
2980 TREE_USED (decl) = 1;
2983 /* If this is a function and an assembler name is specified, reset DECL_RTL
2984 so we can give it its new name. Also, update built_in_decls if it
2985 was a normal built-in. */
2986 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2988 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2990 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2991 set_user_assembler_name (builtin, asmspec);
2992 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2993 init_block_move_fn (asmspec);
2994 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2995 init_block_clear_fn (asmspec);
2997 set_user_assembler_name (decl, asmspec);
3000 /* If #pragma weak was used, mark the decl weak now. */
3001 if (current_scope == file_scope)
3002 maybe_apply_pragma_weak (decl);
3004 /* If this is a variable definition, determine its ELF visibility. */
3005 if (TREE_CODE (decl) == VAR_DECL
3006 && TREE_STATIC (decl)
3007 && !DECL_EXTERNAL (decl))
3008 c_determine_visibility (decl);
3010 /* Output the assembler code and/or RTL code for variables and functions,
3011 unless the type is an undefined structure or union.
3012 If not, it will get done when the type is completed. */
3014 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3016 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3017 if (c_dialect_objc ())
3018 objc_check_decl (decl);
3022 /* If this is not a static variable, issue a warning.
3023 It doesn't make any sense to give an ASMSPEC for an
3024 ordinary, non-register local variable. Historically,
3025 GCC has accepted -- but ignored -- the ASMSPEC in
3027 if (! DECL_FILE_SCOPE_P (decl)
3028 && TREE_CODE (decl) == VAR_DECL
3029 && !C_DECL_REGISTER (decl)
3030 && !TREE_STATIC (decl))
3031 warning ("%Jignoring asm-specifier for non-static local "
3032 "variable '%D'", decl, decl);
3033 else if (C_DECL_REGISTER (decl))
3034 change_decl_assembler_name (decl, get_identifier (asmspec));
3036 set_user_assembler_name (decl, asmspec);
3039 if (DECL_FILE_SCOPE_P (decl))
3041 if (DECL_INITIAL (decl) == NULL_TREE
3042 || DECL_INITIAL (decl) == error_mark_node)
3043 /* Don't output anything
3044 when a tentative file-scope definition is seen.
3045 But at end of compilation, do output code for them. */
3046 DECL_DEFER_OUTPUT (decl) = 1;
3047 rest_of_decl_compilation (decl, true, 0);
3051 /* In conjunction with an ASMSPEC, the `register'
3052 keyword indicates that we should place the variable
3053 in a particular register. */
3054 if (asmspec && C_DECL_REGISTER (decl))
3056 DECL_HARD_REGISTER (decl) = 1;
3057 /* This cannot be done for a structure with volatile
3058 fields, on which DECL_REGISTER will have been
3060 if (!DECL_REGISTER (decl))
3061 error ("cannot put object with volatile field into register");
3064 if (TREE_CODE (decl) != FUNCTION_DECL)
3066 /* If we're building a variable sized type, and we might be
3067 reachable other than via the top of the current binding
3068 level, then create a new BIND_EXPR so that we deallocate
3069 the object at the right time. */
3070 /* Note that DECL_SIZE can be null due to errors. */
3071 if (DECL_SIZE (decl)
3072 && !TREE_CONSTANT (DECL_SIZE (decl))
3073 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3076 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3077 TREE_SIDE_EFFECTS (bind) = 1;
3079 BIND_EXPR_BODY (bind) = push_stmt_list ();
3081 add_stmt (build_stmt (DECL_EXPR, decl));
3086 if (!DECL_FILE_SCOPE_P (decl))
3088 /* Recompute the RTL of a local array now
3089 if it used to be an incomplete type. */
3091 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3093 /* If we used it already as memory, it must stay in memory. */
3094 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3095 /* If it's still incomplete now, no init will save it. */
3096 if (DECL_SIZE (decl) == 0)
3097 DECL_INITIAL (decl) = 0;
3102 /* If this was marked 'used', be sure it will be output. */
3103 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3104 mark_decl_referenced (decl);
3106 if (TREE_CODE (decl) == TYPE_DECL)
3108 if (!DECL_FILE_SCOPE_P (decl)
3109 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3110 add_stmt (build_stmt (DECL_EXPR, decl));
3112 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3115 /* At the end of a declaration, throw away any variable type sizes
3116 of types defined inside that declaration. There is no use
3117 computing them in the following function definition. */
3118 if (current_scope == file_scope)
3119 get_pending_sizes ();
3121 /* Install a cleanup (aka destructor) if one was given. */
3122 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3124 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3127 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3128 tree cleanup_decl = lookup_name (cleanup_id);
3131 /* Build "cleanup(&decl)" for the destructor. */
3132 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3133 cleanup = build_tree_list (NULL_TREE, cleanup);
3134 cleanup = build_function_call (cleanup_decl, cleanup);
3136 /* Don't warn about decl unused; the cleanup uses it. */
3137 TREE_USED (decl) = 1;
3138 TREE_USED (cleanup_decl) = 1;
3140 /* Initialize EH, if we've been told to do so. */
3141 if (flag_exceptions && !c_eh_initialized_p)
3143 c_eh_initialized_p = true;
3144 eh_personality_libfunc
3145 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3146 ? "__gcc_personality_sj0"
3147 : "__gcc_personality_v0");
3148 using_eh_for_cleanups ();
3151 push_cleanup (decl, cleanup, false);
3156 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3159 grokparm (tree parm)
3161 tree decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3162 TREE_PURPOSE (TREE_PURPOSE (parm)),
3165 decl_attributes (&decl, TREE_VALUE (parm), 0);
3170 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3171 and push that on the current scope. */
3174 push_parm_decl (tree parm)
3178 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3179 TREE_PURPOSE (TREE_PURPOSE (parm)),
3181 decl_attributes (&decl, TREE_VALUE (parm), 0);
3183 decl = pushdecl (decl);
3185 finish_decl (decl, NULL_TREE, NULL_TREE);
3188 /* Mark all the parameter declarations to date as forward decls.
3189 Also diagnose use of this extension. */
3192 mark_forward_parm_decls (void)
3194 struct c_binding *b;
3196 if (pedantic && !current_scope->warned_forward_parm_decls)
3198 pedwarn ("ISO C forbids forward parameter declarations");
3199 current_scope->warned_forward_parm_decls = true;
3202 for (b = current_scope->bindings; b; b = b->prev)
3203 if (TREE_CODE (b->decl) == PARM_DECL)
3204 TREE_ASM_WRITTEN (b->decl) = 1;
3207 static GTY(()) int compound_literal_number;
3209 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3210 literal, which may be an incomplete array type completed by the
3211 initializer; INIT is a CONSTRUCTOR that initializes the compound
3215 build_compound_literal (tree type, tree init)
3217 /* We do not use start_decl here because we have a type, not a declarator;
3218 and do not use finish_decl because the decl should be stored inside
3219 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3220 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3223 DECL_EXTERNAL (decl) = 0;
3224 TREE_PUBLIC (decl) = 0;
3225 TREE_STATIC (decl) = (current_scope == file_scope);
3226 DECL_CONTEXT (decl) = current_function_decl;
3227 TREE_USED (decl) = 1;
3228 TREE_TYPE (decl) = type;
3229 TREE_READONLY (decl) = TYPE_READONLY (type);
3230 store_init_value (decl, init);
3232 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3234 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3239 type = TREE_TYPE (decl);
3240 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3241 return error_mark_node;
3243 stmt = build_stmt (DECL_EXPR, decl);
3244 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3245 TREE_SIDE_EFFECTS (complit) = 1;
3247 layout_decl (decl, 0);
3249 if (TREE_STATIC (decl))
3251 /* This decl needs a name for the assembler output. We also need
3252 a unique suffix to be added to the name. */
3255 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3256 compound_literal_number);
3257 compound_literal_number++;
3258 DECL_NAME (decl) = get_identifier (name);
3259 DECL_DEFER_OUTPUT (decl) = 1;
3260 DECL_COMDAT (decl) = 1;
3261 DECL_ARTIFICIAL (decl) = 1;
3263 rest_of_decl_compilation (decl, 1, 0);
3269 /* Make TYPE a complete type based on INITIAL_VALUE.
3270 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3271 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3274 complete_array_type (tree type, tree initial_value, int do_default)
3276 tree maxindex = NULL_TREE;
3281 /* Note MAXINDEX is really the maximum index,
3282 one less than the size. */
3283 if (TREE_CODE (initial_value) == STRING_CST)
3286 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3287 maxindex = build_int_cst (NULL_TREE,
3288 (TREE_STRING_LENGTH (initial_value)
3291 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3293 tree elts = CONSTRUCTOR_ELTS (initial_value);
3294 maxindex = build_int_cst (NULL_TREE, -1);
3295 for (; elts; elts = TREE_CHAIN (elts))
3297 if (TREE_PURPOSE (elts))
3298 maxindex = TREE_PURPOSE (elts);
3300 maxindex = fold (build2 (PLUS_EXPR, integer_type_node,
3301 maxindex, integer_one_node));
3306 /* Make an error message unless that happened already. */
3307 if (initial_value != error_mark_node)
3310 /* Prevent further error messages. */
3311 maxindex = build_int_cst (NULL_TREE, 0);
3318 maxindex = build_int_cst (NULL_TREE, 0);
3324 TYPE_DOMAIN (type) = build_index_type (maxindex);
3325 if (!TREE_TYPE (maxindex))
3329 /* Lay out the type now that we can get the real answer. */
3336 /* Determine whether TYPE is a structure with a flexible array member,
3337 or a union containing such a structure (possibly recursively). */
3340 flexible_array_type_p (tree type)
3343 switch (TREE_CODE (type))
3346 x = TYPE_FIELDS (type);
3349 while (TREE_CHAIN (x) != NULL_TREE)
3351 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3352 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3353 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3354 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3358 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3360 if (flexible_array_type_p (TREE_TYPE (x)))
3369 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3370 replacing with appropriate values if they are invalid. */
3372 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3375 unsigned int max_width;
3376 unsigned HOST_WIDE_INT w;
3377 const char *name = orig_name ? orig_name: _("<anonymous>");
3380 STRIP_NOPS (*width);
3382 /* Detect and ignore out of range field width and process valid
3384 if (TREE_CODE (*width) != INTEGER_CST)
3386 error ("bit-field `%s' width not an integer constant", name);
3387 *width = integer_one_node;
3391 constant_expression_warning (*width);
3392 if (tree_int_cst_sgn (*width) < 0)
3394 error ("negative width in bit-field `%s'", name);
3395 *width = integer_one_node;
3397 else if (integer_zerop (*width) && orig_name)
3399 error ("zero width for bit-field `%s'", name);
3400 *width = integer_one_node;
3404 /* Detect invalid bit-field type. */
3405 if (TREE_CODE (*type) != INTEGER_TYPE
3406 && TREE_CODE (*type) != BOOLEAN_TYPE
3407 && TREE_CODE (*type) != ENUMERAL_TYPE)
3409 error ("bit-field `%s' has invalid type", name);
3410 *type = unsigned_type_node;
3413 type_mv = TYPE_MAIN_VARIANT (*type);
3415 && type_mv != integer_type_node
3416 && type_mv != unsigned_type_node
3417 && type_mv != boolean_type_node)
3418 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3420 if (type_mv == boolean_type_node)
3421 max_width = CHAR_TYPE_SIZE;
3423 max_width = TYPE_PRECISION (*type);
3425 if (0 < compare_tree_int (*width, max_width))
3427 error ("width of `%s' exceeds its type", name);
3429 *width = build_int_cst (NULL_TREE, w);
3432 w = tree_low_cst (*width, 1);
3434 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3436 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3438 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3439 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3440 warning ("`%s' is narrower than values of its type", name);
3444 /* Given declspecs and a declarator,
3445 determine the name and type of the object declared
3446 and construct a ..._DECL node for it.
3447 (In one case we can return a ..._TYPE node instead.
3448 For invalid input we sometimes return 0.)
3450 DECLSPECS is a chain of tree_list nodes whose value fields
3451 are the storage classes and type specifiers.
3453 DECL_CONTEXT says which syntactic context this declaration is in:
3454 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3455 FUNCDEF for a function definition. Like NORMAL but a few different
3456 error messages in each case. Return value may be zero meaning
3457 this definition is too screwy to try to parse.
3458 PARM for a parameter declaration (either within a function prototype
3459 or before a function body). Make a PARM_DECL, or return void_type_node.
3460 TYPENAME if for a typename (in a cast or sizeof).
3461 Don't make a DECL node; just return the ..._TYPE node.
3462 FIELD for a struct or union field; make a FIELD_DECL.
3463 INITIALIZED is true if the decl has an initializer.
3464 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3465 representing the width of the bit-field.
3467 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3468 It may also be so in the PARM case, for a prototype where the
3469 argument type is specified but not the name.
3471 This function is where the complicated C meanings of `static'
3472 and `extern' are interpreted. */
3475 grokdeclarator (tree declarator, tree declspecs,
3476 enum decl_context decl_context, bool initialized, tree *width)
3480 tree type = NULL_TREE;
3485 int type_quals = TYPE_UNQUALIFIED;
3487 int explicit_int = 0;
3488 int explicit_char = 0;
3489 int defaulted_int = 0;
3490 tree typedef_decl = 0;
3491 const char *name, *orig_name;
3492 tree typedef_type = 0;
3493 int funcdef_flag = 0;
3494 enum tree_code innermost_code = ERROR_MARK;
3495 int size_varies = 0;
3496 tree decl_attr = NULL_TREE;
3497 tree array_ptr_quals = NULL_TREE;
3498 int array_parm_static = 0;
3499 tree returned_attrs = NULL_TREE;
3500 bool bitfield = width != NULL;
3502 tree arg_info = NULL_TREE;
3504 if (decl_context == FUNCDEF)
3505 funcdef_flag = 1, decl_context = NORMAL;
3507 /* Look inside a declarator for the name being declared
3508 and get it as a string, for an error message. */
3510 tree decl = declarator;
3514 switch (TREE_CODE (decl))
3519 innermost_code = TREE_CODE (decl);
3520 decl = TREE_OPERAND (decl, 0);
3524 decl = TREE_VALUE (decl);
3527 case IDENTIFIER_NODE:
3528 name = IDENTIFIER_POINTER (decl);
3540 /* A function definition's declarator must have the form of
3541 a function declarator. */
3543 if (funcdef_flag && innermost_code != CALL_EXPR)
3546 /* If this looks like a function definition, make it one,
3547 even if it occurs where parms are expected.
3548 Then store_parm_decls will reject it and not use it as a parm. */
3549 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3550 decl_context = PARM;
3552 /* Look through the decl specs and record which ones appear.
3553 Some typespecs are defined as built-in typenames.
3554 Others, the ones that are modifiers of other types,
3555 are represented by bits in SPECBITS: set the bits for
3556 the modifiers that appear. Storage class keywords are also in SPECBITS.
3558 If there is a typedef name or a type, store the type in TYPE.
3559 This includes builtin typedefs such as `int'.
3561 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3562 and did not come from a user typedef.
3564 Set LONGLONG if `long' is mentioned twice. */
3566 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3568 tree id = TREE_VALUE (spec);
3570 /* If the entire declaration is itself tagged as deprecated then
3571 suppress reports of deprecated items. */
3572 if (id && TREE_DEPRECATED (id))
3574 if (deprecated_state != DEPRECATED_SUPPRESS)
3575 warn_deprecated_use (id);
3578 if (id == ridpointers[(int) RID_INT])
3580 if (id == ridpointers[(int) RID_CHAR])
3583 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3585 enum rid i = C_RID_CODE (id);
3586 if ((int) i <= (int) RID_LAST_MODIFIER)
3588 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3591 error ("`long long long' is too long for GCC");
3594 if (pedantic && !flag_isoc99 && ! in_system_header
3596 pedwarn ("ISO C90 does not support `long long'");
3600 else if (specbits & (1 << (int) i))
3602 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3604 if (pedantic && !flag_isoc99)
3605 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3608 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3611 /* Diagnose "__thread extern". Recall that this list
3612 is in the reverse order seen in the text. */
3614 && (specbits & (1 << (int) RID_EXTERN
3615 | 1 << (int) RID_STATIC)))
3617 if (specbits & 1 << (int) RID_EXTERN)
3618 error ("`__thread' before `extern'");
3620 error ("`__thread' before `static'");
3623 specbits |= 1 << (int) i;
3628 error ("two or more data types in declaration of `%s'", name);
3629 /* Actual typedefs come to us as TYPE_DECL nodes. */
3630 else if (TREE_CODE (id) == TYPE_DECL)
3632 if (TREE_TYPE (id) == error_mark_node)
3633 ; /* Allow the type to default to int to avoid cascading errors. */
3636 type = TREE_TYPE (id);
3637 decl_attr = DECL_ATTRIBUTES (id);
3641 /* Built-in types come as identifiers. */
3642 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3644 tree t = lookup_name (id);
3645 if (!t || TREE_CODE (t) != TYPE_DECL)
3646 error ("`%s' fails to be a typedef or built in type",
3647 IDENTIFIER_POINTER (id));
3648 else if (TREE_TYPE (t) == error_mark_node)
3652 type = TREE_TYPE (t);
3656 else if (TREE_CODE (id) != ERROR_MARK)
3663 typedef_type = type;
3665 size_varies = C_TYPE_VARIABLE_SIZE (type);
3667 /* No type at all: default to `int', and set DEFAULTED_INT
3668 because it was not a user-defined typedef. */
3672 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3673 | (1 << (int) RID_SIGNED)
3674 | (1 << (int) RID_UNSIGNED)
3675 | (1 << (int) RID_COMPLEX))))
3676 /* Don't warn about typedef foo = bar. */
3677 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3678 && ! in_system_header)
3680 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3681 and this is a function, or if -Wimplicit; prefer the former
3682 warning since it is more explicit. */
3683 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3685 warn_about_return_type = 1;
3686 else if (warn_implicit_int || flag_isoc99)
3687 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3692 type = integer_type_node;
3695 /* Now process the modifiers that were specified
3696 and check for invalid combinations. */
3698 /* Long double is a special combination. */
3700 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3701 && TYPE_MAIN_VARIANT (type) == double_type_node)
3703 specbits &= ~(1 << (int) RID_LONG);
3704 type = long_double_type_node;
3707 /* Check all other uses of type modifiers. */
3709 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3710 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3714 if ((specbits & 1 << (int) RID_LONG)
3715 && (specbits & 1 << (int) RID_SHORT))
3716 error ("both long and short specified for `%s'", name);
3717 else if (((specbits & 1 << (int) RID_LONG)
3718 || (specbits & 1 << (int) RID_SHORT))
3720 error ("long or short specified with char for `%s'", name);
3721 else if (((specbits & 1 << (int) RID_LONG)
3722 || (specbits & 1 << (int) RID_SHORT))
3723 && TREE_CODE (type) == REAL_TYPE)
3725 static int already = 0;
3727 error ("long or short specified with floating type for `%s'", name);
3728 if (! already && ! pedantic)
3730 error ("the only valid combination is `long double'");
3734 else if ((specbits & 1 << (int) RID_SIGNED)
3735 && (specbits & 1 << (int) RID_UNSIGNED))
3736 error ("both signed and unsigned specified for `%s'", name);
3737 else if (TREE_CODE (type) != INTEGER_TYPE)
3738 error ("long, short, signed or unsigned invalid for `%s'", name);
3742 if (!explicit_int && !defaulted_int && !explicit_char)
3744 error ("long, short, signed or unsigned used invalidly for `%s'",
3750 /* Discard the type modifiers if they are invalid. */
3753 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3754 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3759 if ((specbits & (1 << (int) RID_COMPLEX))
3760 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3762 error ("complex invalid for `%s'", name);
3763 specbits &= ~(1 << (int) RID_COMPLEX);
3766 /* Decide whether an integer type is signed or not.
3767 Optionally treat bit-fields as signed by default. */
3768 if (specbits & 1 << (int) RID_UNSIGNED
3769 || (bitfield && ! flag_signed_bitfields
3770 && (explicit_int || defaulted_int || explicit_char
3771 /* A typedef for plain `int' without `signed'
3772 can be controlled just like plain `int'. */
3773 || ! (typedef_decl != 0
3774 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3775 && TREE_CODE (type) != ENUMERAL_TYPE
3776 && !(specbits & 1 << (int) RID_SIGNED)))
3779 type = long_long_unsigned_type_node;
3780 else if (specbits & 1 << (int) RID_LONG)
3781 type = long_unsigned_type_node;
3782 else if (specbits & 1 << (int) RID_SHORT)
3783 type = short_unsigned_type_node;
3784 else if (type == char_type_node)
3785 type = unsigned_char_type_node;
3786 else if (typedef_decl)
3787 type = c_common_unsigned_type (type);
3789 type = unsigned_type_node;
3791 else if ((specbits & 1 << (int) RID_SIGNED)
3792 && type == char_type_node)
3793 type = signed_char_type_node;
3795 type = long_long_integer_type_node;
3796 else if (specbits & 1 << (int) RID_LONG)
3797 type = long_integer_type_node;
3798 else if (specbits & 1 << (int) RID_SHORT)
3799 type = short_integer_type_node;
3801 if (specbits & 1 << (int) RID_COMPLEX)
3803 if (pedantic && !flag_isoc99)
3804 pedwarn ("ISO C90 does not support complex types");
3805 /* If we just have "complex", it is equivalent to
3806 "complex double", but if any modifiers at all are specified it is
3807 the complex form of TYPE. E.g, "complex short" is
3808 "complex short int". */
3810 if (defaulted_int && ! longlong
3811 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3812 | (1 << (int) RID_SIGNED)
3813 | (1 << (int) RID_UNSIGNED))))
3816 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3817 type = complex_double_type_node;
3819 else if (type == integer_type_node)
3822 pedwarn ("ISO C does not support complex integer types");
3823 type = complex_integer_type_node;
3825 else if (type == float_type_node)
3826 type = complex_float_type_node;
3827 else if (type == double_type_node)
3828 type = complex_double_type_node;
3829 else if (type == long_double_type_node)
3830 type = complex_long_double_type_node;
3834 pedwarn ("ISO C does not support complex integer types");
3835 type = build_complex_type (type);
3839 /* Check the type and width of a bit-field. */
3841 check_bitfield_type_and_width (&type, width, orig_name);
3843 /* Figure out the type qualifiers for the declaration. There are
3844 two ways a declaration can become qualified. One is something
3845 like `const int i' where the `const' is explicit. Another is
3846 something like `typedef const int CI; CI i' where the type of the
3847 declaration contains the `const'. A third possibility is that
3848 there is a type qualifier on the element type of a typedefed
3849 array type, in which case we should extract that qualifier so
3850 that c_apply_type_quals_to_decls receives the full list of
3851 qualifiers to work with (C90 is not entirely clear about whether
3852 duplicate qualifiers should be diagnosed in this case, but it
3853 seems most appropriate to do so). */
3854 element_type = strip_array_types (type);
3855 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3857 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3859 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3860 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3861 if (pedantic && !flag_isoc99)
3864 pedwarn ("duplicate `const'");
3866 pedwarn ("duplicate `restrict'");
3868 pedwarn ("duplicate `volatile'");
3870 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3871 type = TYPE_MAIN_VARIANT (type);
3872 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3873 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3874 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3876 /* Warn if two storage classes are given. Default to `auto'. */
3881 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3882 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3883 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3884 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3885 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3887 /* "static __thread" and "extern __thread" are allowed. */
3888 if ((specbits & (1 << (int) RID_THREAD
3889 | 1 << (int) RID_STATIC
3890 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3893 /* Warn about storage classes that are invalid for certain
3894 kinds of declarations (parameters, typenames, etc.). */
3897 error ("multiple storage classes in declaration of `%s'", name);
3898 else if (funcdef_flag
3900 & ((1 << (int) RID_REGISTER)
3901 | (1 << (int) RID_AUTO)
3902 | (1 << (int) RID_TYPEDEF)
3903 | (1 << (int) RID_THREAD))))
3905 if (specbits & 1 << (int) RID_AUTO
3906 && (pedantic || current_scope == file_scope))
3907 pedwarn ("function definition declared `auto'");
3908 if (specbits & 1 << (int) RID_REGISTER)
3909 error ("function definition declared `register'");
3910 if (specbits & 1 << (int) RID_TYPEDEF)
3911 error ("function definition declared `typedef'");
3912 if (specbits & 1 << (int) RID_THREAD)
3913 error ("function definition declared `__thread'");
3914 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3915 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3917 else if (decl_context != NORMAL && nclasses > 0)
3919 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3923 switch (decl_context)
3926 error ("storage class specified for structure field `%s'",
3930 error ("storage class specified for parameter `%s'", name);
3933 error ("storage class specified for typename");
3936 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3937 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3938 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3941 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3943 /* `extern' with initialization is invalid if not at file scope. */
3944 if (current_scope == file_scope)
3945 warning ("`%s' initialized and declared `extern'", name);
3947 error ("`%s' has both `extern' and initializer", name);
3949 else if (current_scope == file_scope)
3951 if (specbits & 1 << (int) RID_AUTO)
3952 error ("file-scope declaration of `%s' specifies `auto'", name);
3956 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3957 error ("nested function `%s' declared `extern'", name);
3958 else if ((specbits & (1 << (int) RID_THREAD
3959 | 1 << (int) RID_EXTERN
3960 | 1 << (int) RID_STATIC))
3961 == (1 << (int) RID_THREAD))
3963 error ("function-scope `%s' implicitly auto and declared `__thread'",
3965 specbits &= ~(1 << (int) RID_THREAD);
3970 /* Now figure out the structure of the declarator proper.
3971 Descend through it, creating more complex types, until we reach
3972 the declared identifier (or NULL_TREE, in an absolute declarator). */
3974 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3976 if (type == error_mark_node)
3978 declarator = TREE_OPERAND (declarator, 0);
3982 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3983 an INDIRECT_REF (for *...),
3984 a CALL_EXPR (for ...(...)),
3985 a TREE_LIST (for nested attributes),
3986 an identifier (for the name being declared)
3987 or a null pointer (for the place in an absolute declarator
3988 where the name was omitted).
3989 For the last two cases, we have just exited the loop.
3991 At this point, TYPE is the type of elements of an array,
3992 or for a function to return, or for a pointer to point to.
3993 After this sequence of ifs, TYPE is the type of the
3994 array or function or pointer, and DECLARATOR has had its
3995 outermost layer removed. */
3997 if (array_ptr_quals != NULL_TREE || array_parm_static)
3999 /* Only the innermost declarator (making a parameter be of
4000 array type which is converted to pointer type)
4001 may have static or type qualifiers. */
4002 error ("static or type qualifiers in non-parameter array declarator");
4003 array_ptr_quals = NULL_TREE;
4004 array_parm_static = 0;
4007 if (TREE_CODE (declarator) == TREE_LIST)
4009 /* We encode a declarator with embedded attributes using
4011 tree attrs = TREE_PURPOSE (declarator);
4014 declarator = TREE_VALUE (declarator);
4015 inner_decl = declarator;
4016 while (inner_decl != NULL_TREE
4017 && TREE_CODE (inner_decl) == TREE_LIST)
4018 inner_decl = TREE_VALUE (inner_decl);
4019 if (inner_decl == NULL_TREE
4020 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4021 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4022 else if (TREE_CODE (inner_decl) == CALL_EXPR)
4023 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4024 else if (TREE_CODE (inner_decl) == ARRAY_REF)
4025 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4026 returned_attrs = decl_attributes (&type,
4027 chainon (returned_attrs, attrs),
4030 else if (TREE_CODE (declarator) == ARRAY_REF)
4032 tree itype = NULL_TREE;
4033 tree size = TREE_OPERAND (declarator, 1);
4034 /* The index is a signed object `sizetype' bits wide. */
4035 tree index_type = c_common_signed_type (sizetype);
4037 array_ptr_quals = TREE_TYPE (declarator);
4038 array_parm_static = TREE_STATIC (declarator);
4040 declarator = TREE_OPERAND (declarator, 0);
4042 /* Check for some types that there cannot be arrays of. */
4044 if (VOID_TYPE_P (type))
4046 error ("declaration of `%s' as array of voids", name);
4047 type = error_mark_node;
4050 if (TREE_CODE (type) == FUNCTION_TYPE)
4052 error ("declaration of `%s' as array of functions", name);
4053 type = error_mark_node;
4056 if (pedantic && !in_system_header && flexible_array_type_p (type))
4057 pedwarn ("invalid use of structure with flexible array member");
4059 if (size == error_mark_node)
4060 type = error_mark_node;
4062 if (type == error_mark_node)
4065 /* If size was specified, set ITYPE to a range-type for that size.
4066 Otherwise, ITYPE remains null. finish_decl may figure it out
4067 from an initial value. */
4071 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4072 STRIP_TYPE_NOPS (size);
4074 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4076 error ("size of array `%s' has non-integer type", name);
4077 size = integer_one_node;
4080 if (pedantic && integer_zerop (size))
4081 pedwarn ("ISO C forbids zero-size array `%s'", name);
4083 if (TREE_CODE (size) == INTEGER_CST)
4085 constant_expression_warning (size);
4086 if (tree_int_cst_sgn (size) < 0)
4088 error ("size of array `%s' is negative", name);
4089 size = integer_one_node;
4094 /* Make sure the array size remains visibly nonconstant
4095 even if it is (eg) a const variable with known value. */
4098 if (!flag_isoc99 && pedantic)
4100 if (TREE_CONSTANT (size))
4101 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
4104 pedwarn ("ISO C90 forbids variable-size array `%s'",
4109 if (integer_zerop (size))
4111 /* A zero-length array cannot be represented with an
4112 unsigned index type, which is what we'll get with
4113 build_index_type. Create an open-ended range instead. */
4114 itype = build_range_type (sizetype, size, NULL_TREE);
4118 /* Compute the maximum valid index, that is, size - 1.
4119 Do the calculation in index_type, so that if it is
4120 a variable the computations will be done in the
4122 itype = fold (build2 (MINUS_EXPR, index_type,
4123 convert (index_type, size),
4124 convert (index_type, size_one_node)));
4126 /* If that overflowed, the array is too big.
4127 ??? While a size of INT_MAX+1 technically shouldn't
4128 cause an overflow (because we subtract 1), the overflow
4129 is recorded during the conversion to index_type, before
4130 the subtraction. Handling this case seems like an
4131 unnecessary complication. */
4132 if (TREE_OVERFLOW (itype))
4134 error ("size of array `%s' is too large", name);
4135 type = error_mark_node;
4140 itype = variable_size (itype);
4141 itype = build_index_type (itype);
4144 else if (decl_context == FIELD)
4146 if (pedantic && !flag_isoc99 && !in_system_header)
4147 pedwarn ("ISO C90 does not support flexible array members");
4149 /* ISO C99 Flexible array members are effectively identical
4150 to GCC's zero-length array extension. */
4151 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4154 /* If pedantic, complain about arrays of incomplete types. */
4156 if (pedantic && !COMPLETE_TYPE_P (type))
4157 pedwarn ("array type has incomplete element type");
4159 /* Build the array type itself, then merge any constancy or
4160 volatility into the target type. We must do it in this order
4161 to ensure that the TYPE_MAIN_VARIANT field of the array type
4162 is set correctly. */
4164 type = build_array_type (type, itype);
4166 type = c_build_qualified_type (type, type_quals);
4169 C_TYPE_VARIABLE_SIZE (type) = 1;
4171 /* The GCC extension for zero-length arrays differs from
4172 ISO flexible array members in that sizeof yields zero. */
4173 if (size && integer_zerop (size))
4176 TYPE_SIZE (type) = bitsize_zero_node;
4177 TYPE_SIZE_UNIT (type) = size_zero_node;
4179 else if (declarator && TREE_CODE (declarator) == INDIRECT_REF)
4180 /* We can never complete an array type which is the target of a
4181 pointer, so go ahead and lay it out. */
4184 if (decl_context != PARM
4185 && (array_ptr_quals != NULL_TREE || array_parm_static))
4187 error ("static or type qualifiers in non-parameter array declarator");
4188 array_ptr_quals = NULL_TREE;
4189 array_parm_static = 0;
4192 else if (TREE_CODE (declarator) == CALL_EXPR)
4194 /* Say it's a definition only for the declarator closest to
4195 the identifier, apart possibly from some attributes. */
4196 bool really_funcdef = false;
4200 tree t = TREE_OPERAND (declarator, 0);
4201 while (TREE_CODE (t) == TREE_LIST)
4203 really_funcdef = (TREE_CODE (t) == IDENTIFIER_NODE);
4206 /* Declaring a function type.
4207 Make sure we have a valid type for the function to return. */
4208 if (type == error_mark_node)
4213 /* Warn about some types functions can't return. */
4215 if (TREE_CODE (type) == FUNCTION_TYPE)
4217 error ("`%s' declared as function returning a function", name);
4218 type = integer_type_node;
4220 if (TREE_CODE (type) == ARRAY_TYPE)
4222 error ("`%s' declared as function returning an array", name);
4223 type = integer_type_node;
4226 /* Construct the function type and go to the next
4227 inner layer of declarator. */
4228 arg_info = TREE_OPERAND (declarator, 1);
4229 arg_types = grokparms (arg_info, really_funcdef);
4231 /* Type qualifiers before the return type of the function
4232 qualify the return type, not the function type. */
4235 /* Type qualifiers on a function return type are
4236 normally permitted by the standard but have no
4237 effect, so give a warning at -Wreturn-type.
4238 Qualifiers on a void return type are banned on
4239 function definitions in ISO C; GCC used to used them
4240 for noreturn functions. */
4241 if (VOID_TYPE_P (type) && really_funcdef)
4242 pedwarn ("function definition has qualified void return type");
4243 else if (warn_return_type)
4244 warning ("type qualifiers ignored on function return type");
4246 type = c_build_qualified_type (type, type_quals);
4248 type_quals = TYPE_UNQUALIFIED;
4250 type = build_function_type (type, arg_types);
4251 declarator = TREE_OPERAND (declarator, 0);
4253 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4254 the formal parameter list of this FUNCTION_TYPE to point to
4255 the FUNCTION_TYPE node itself. */
4260 for (link = ARG_INFO_TAGS (arg_info);
4262 link = TREE_CHAIN (link))
4263 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4266 else if (TREE_CODE (declarator) == INDIRECT_REF)
4268 /* Merge any constancy or volatility into the target type
4271 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4273 pedwarn ("ISO C forbids qualified function types");
4275 type = c_build_qualified_type (type, type_quals);
4276 type_quals = TYPE_UNQUALIFIED;
4279 type = build_pointer_type (type);
4281 /* Process a list of type modifier keywords
4282 (such as const or volatile) that were given inside the `*'. */
4284 if (TREE_TYPE (declarator))
4292 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4293 typemodlist = TREE_CHAIN (typemodlist))
4295 tree qualifier = TREE_VALUE (typemodlist);
4297 if (C_IS_RESERVED_WORD (qualifier))
4299 if (C_RID_CODE (qualifier) == RID_CONST)
4301 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4303 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4313 error ("invalid type modifier within pointer declarator");
4314 if (pedantic && !flag_isoc99)
4317 pedwarn ("duplicate `const'");
4319 pedwarn ("duplicate `volatile'");
4321 pedwarn ("duplicate `restrict'");
4324 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4325 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4326 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4329 declarator = TREE_OPERAND (declarator, 0);
4336 /* Now TYPE has the actual type. */
4338 /* Did array size calculations overflow? */
4340 if (TREE_CODE (type) == ARRAY_TYPE
4341 && COMPLETE_TYPE_P (type)
4342 && TREE_OVERFLOW (TYPE_SIZE (type)))
4344 error ("size of array `%s' is too large", name);
4345 /* If we proceed with the array type as it is, we'll eventually
4346 crash in tree_low_cst(). */
4347 type = error_mark_node;
4350 /* If this is declaring a typedef name, return a TYPE_DECL. */
4352 if (specbits & (1 << (int) RID_TYPEDEF))
4355 /* Note that the grammar rejects storage classes
4356 in typenames, fields or parameters */
4357 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4359 pedwarn ("ISO C forbids qualified function types");
4361 type = c_build_qualified_type (type, type_quals);
4362 decl = build_decl (TYPE_DECL, declarator, type);
4363 if ((specbits & (1 << (int) RID_SIGNED))
4364 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4365 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4366 decl_attributes (&decl, returned_attrs, 0);
4370 /* Detect the case of an array type of unspecified size
4371 which came, as such, direct from a typedef name.
4372 We must copy the type, so that each identifier gets
4373 a distinct type, so that each identifier's size can be
4374 controlled separately by its own initializer. */
4376 if (type != 0 && typedef_type != 0
4377 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4378 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4380 type = build_array_type (TREE_TYPE (type), 0);
4382 C_TYPE_VARIABLE_SIZE (type) = 1;
4385 /* If this is a type name (such as, in a cast or sizeof),
4386 compute the type and return it now. */
4388 if (decl_context == TYPENAME)
4390 /* Note that the grammar rejects storage classes
4391 in typenames, fields or parameters */
4392 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4394 pedwarn ("ISO C forbids const or volatile function types");
4396 type = c_build_qualified_type (type, type_quals);
4397 decl_attributes (&type, returned_attrs, 0);
4401 /* Aside from typedefs and type names (handle above),
4402 `void' at top level (not within pointer)
4403 is allowed only in public variables.
4404 We don't complain about parms either, but that is because
4405 a better error message can be made later. */
4407 if (VOID_TYPE_P (type) && decl_context != PARM
4408 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4409 && ((specbits & (1 << (int) RID_EXTERN))
4410 || (current_scope == file_scope
4412 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4414 error ("variable or field `%s' declared void", name);
4415 type = integer_type_node;
4418 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4419 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4424 if (decl_context == PARM)
4426 tree type_as_written;
4429 /* A parameter declared as an array of T is really a pointer to T.
4430 One declared as a function is really a pointer to a function. */
4432 if (TREE_CODE (type) == ARRAY_TYPE)
4434 /* Transfer const-ness of array into that of type pointed to. */
4435 type = TREE_TYPE (type);
4437 type = c_build_qualified_type (type, type_quals);
4438 type = build_pointer_type (type);
4439 type_quals = TYPE_UNQUALIFIED;
4440 if (array_ptr_quals)
4442 tree new_ptr_quals, new_ptr_attrs;
4444 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4445 /* We don't yet implement attributes in this context. */
4446 if (new_ptr_attrs != NULL_TREE)
4447 warning ("attributes in parameter array declarator ignored");
4452 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4454 tree qualifier = TREE_VALUE (new_ptr_quals);
4456 if (C_IS_RESERVED_WORD (qualifier))
4458 if (C_RID_CODE (qualifier) == RID_CONST)
4460 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4462 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4472 error ("invalid type modifier within array declarator");
4474 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4475 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4476 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4480 else if (TREE_CODE (type) == FUNCTION_TYPE)
4482 if (pedantic && type_quals)
4483 pedwarn ("ISO C forbids qualified function types");
4485 type = c_build_qualified_type (type, type_quals);
4486 type = build_pointer_type (type);
4487 type_quals = TYPE_UNQUALIFIED;
4489 else if (type_quals)
4490 type = c_build_qualified_type (type, type_quals);
4492 type_as_written = type;
4494 decl = build_decl (PARM_DECL, declarator, type);
4496 C_DECL_VARIABLE_SIZE (decl) = 1;
4498 /* Compute the type actually passed in the parmlist,
4499 for the case where there is no prototype.
4500 (For example, shorts and chars are passed as ints.)
4501 When there is a prototype, this is overridden later. */
4503 if (type == error_mark_node)
4504 promoted_type = type;
4506 promoted_type = c_type_promotes_to (type);
4508 DECL_ARG_TYPE (decl) = promoted_type;
4509 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4511 else if (decl_context == FIELD)
4513 /* Structure field. It may not be a function. */
4515 if (TREE_CODE (type) == FUNCTION_TYPE)
4517 error ("field `%s' declared as a function", name);
4518 type = build_pointer_type (type);
4520 else if (TREE_CODE (type) != ERROR_MARK
4521 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4523 error ("field `%s' has incomplete type", name);
4524 type = error_mark_node;
4526 /* Move type qualifiers down to element of an array. */
4527 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4528 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4530 TYPE_DOMAIN (type));
4531 decl = build_decl (FIELD_DECL, declarator, type);
4532 DECL_NONADDRESSABLE_P (decl) = bitfield;
4535 C_DECL_VARIABLE_SIZE (decl) = 1;
4537 else if (TREE_CODE (type) == FUNCTION_TYPE)
4539 if (specbits & (1 << (int) RID_AUTO)
4540 && (pedantic || current_scope == file_scope))
4541 pedwarn ("invalid storage class for function `%s'", name);
4542 if (specbits & (1 << (int) RID_REGISTER))
4543 error ("invalid storage class for function `%s'", name);
4544 if (specbits & (1 << (int) RID_THREAD))
4545 error ("invalid storage class for function `%s'", name);
4546 /* Function declaration not at file scope.
4547 Storage classes other than `extern' are not allowed
4548 and `extern' makes no difference. */
4549 if (current_scope != file_scope
4550 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4552 pedwarn ("invalid storage class for function `%s'", name);
4554 decl = build_decl (FUNCTION_DECL, declarator, type);
4555 decl = build_decl_attribute_variant (decl, decl_attr);
4557 DECL_LANG_SPECIFIC (decl)
4558 = GGC_CNEW (struct lang_decl);
4560 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4561 pedwarn ("ISO C forbids qualified function types");
4563 /* GNU C interprets a volatile-qualified function type to indicate
4564 that the function does not return. */
4565 if ((type_quals & TYPE_QUAL_VOLATILE)
4566 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4567 warning ("`noreturn' function returns non-void value");
4569 /* Every function declaration is an external reference
4570 (DECL_EXTERNAL) except for those which are not at file
4571 scope and are explicitly declared "auto". This is
4572 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4573 GCC to signify a forward declaration of a nested function. */
4574 if ((specbits & (1 << RID_AUTO)) && current_scope != file_scope)
4575 DECL_EXTERNAL (decl) = 0;
4577 DECL_EXTERNAL (decl) = 1;
4579 /* Record absence of global scope for `static' or `auto'. */
4581 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4583 /* For a function definition, record the argument information
4584 block in DECL_ARGUMENTS where store_parm_decls will look
4587 DECL_ARGUMENTS (decl) = arg_info;
4590 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4592 /* Record presence of `inline', if it is reasonable. */
4593 if (MAIN_NAME_P (declarator))
4596 warning ("cannot inline function `main'");
4600 /* Record that the function is declared `inline'. */
4601 DECL_DECLARED_INLINE_P (decl) = 1;
4603 /* Do not mark bare declarations as DECL_INLINE. Doing so
4604 in the presence of multiple declarations can result in
4605 the abstract origin pointing between the declarations,
4606 which will confuse dwarf2out. */
4609 DECL_INLINE (decl) = 1;
4610 if (specbits & (1 << (int) RID_EXTERN))
4611 current_extern_inline = 1;
4614 /* If -finline-functions, assume it can be inlined. This does
4615 two things: let the function be deferred until it is actually
4616 needed, and let dwarf2 know that the function is inlinable. */
4617 else if (flag_inline_trees == 2 && initialized)
4618 DECL_INLINE (decl) = 1;
4622 /* It's a variable. */
4623 /* An uninitialized decl with `extern' is a reference. */
4624 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4626 /* Move type qualifiers down to element of an array. */
4627 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4629 int saved_align = TYPE_ALIGN(type);
4630 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4632 TYPE_DOMAIN (type));
4633 TYPE_ALIGN (type) = saved_align;
4635 else if (type_quals)
4636 type = c_build_qualified_type (type, type_quals);
4638 /* C99 6.2.2p7: It is invalid (compile-time undefined
4639 behavior) to create an 'extern' declaration for a
4640 variable if there is a global declaration that is
4641 'static' and the global declaration is not visible.
4642 (If the static declaration _is_ currently visible,
4643 the 'extern' declaration is taken to refer to that decl.) */
4644 if (extern_ref && current_scope != file_scope)
4646 tree global_decl = identifier_global_value (declarator);
4647 tree visible_decl = lookup_name (declarator);
4650 && global_decl != visible_decl
4651 && TREE_CODE (global_decl) == VAR_DECL
4652 && !TREE_PUBLIC (global_decl))
4653 error ("variable previously declared 'static' redeclared "
4657 decl = build_decl (VAR_DECL, declarator, type);
4659 C_DECL_VARIABLE_SIZE (decl) = 1;
4662 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4664 /* At file scope, an initialized extern declaration may follow
4665 a static declaration. In that case, DECL_EXTERNAL will be
4666 reset later in start_decl. */
4667 DECL_EXTERNAL (decl) = !!(specbits & (1 << (int) RID_EXTERN));
4669 /* At file scope, the presence of a `static' or `register' storage
4670 class specifier, or the absence of all storage class specifiers
4671 makes this declaration a definition (perhaps tentative). Also,
4672 the absence of both `static' and `register' makes it public. */
4673 if (current_scope == file_scope)
4675 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4676 | (1 << (int) RID_REGISTER)));
4677 TREE_STATIC (decl) = !extern_ref;
4679 /* Not at file scope, only `static' makes a static definition. */
4682 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4683 TREE_PUBLIC (decl) = extern_ref;
4686 if (specbits & 1 << (int) RID_THREAD)
4688 if (targetm.have_tls)
4689 DECL_THREAD_LOCAL (decl) = 1;
4691 /* A mere warning is sure to result in improper semantics
4692 at runtime. Don't bother to allow this to compile. */
4693 error ("thread-local storage not supported for this target");
4697 /* Record `register' declaration for warnings on &
4698 and in case doing stupid register allocation. */
4700 if (specbits & (1 << (int) RID_REGISTER))
4702 C_DECL_REGISTER (decl) = 1;
4703 DECL_REGISTER (decl) = 1;
4706 /* Record constancy and volatility. */
4707 c_apply_type_quals_to_decl (type_quals, decl);
4709 /* If a type has volatile components, it should be stored in memory.
4710 Otherwise, the fact that those components are volatile
4711 will be ignored, and would even crash the compiler. */
4712 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4714 /* It is not an error for a structure with volatile fields to
4715 be declared register, but reset DECL_REGISTER since it
4716 cannot actually go in a register. */
4717 int was_reg = C_DECL_REGISTER (decl);
4718 C_DECL_REGISTER (decl) = 0;
4719 DECL_REGISTER (decl) = 0;
4720 c_mark_addressable (decl);
4721 C_DECL_REGISTER (decl) = was_reg;
4724 #ifdef ENABLE_CHECKING
4725 /* This is the earliest point at which we might know the assembler
4726 name of a variable. Thus, if it's known before this, die horribly. */
4727 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4731 decl_attributes (&decl, returned_attrs, 0);
4737 /* Decode the parameter-list info for a function type or function definition.
4738 The argument is the value returned by `get_parm_info' (or made in parse.y
4739 if there is an identifier list instead of a parameter decl list).
4740 These two functions are separate because when a function returns
4741 or receives functions then each is called multiple times but the order
4742 of calls is different. The last call to `grokparms' is always the one
4743 that contains the formal parameter names of a function definition.
4745 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4747 FUNCDEF_FLAG is true for a function definition, false for
4748 a mere declaration. A nonempty identifier-list gets an error message
4749 when FUNCDEF_FLAG is false. */
4752 grokparms (tree arg_info, bool funcdef_flag)
4754 tree arg_types = ARG_INFO_TYPES (arg_info);
4756 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4757 && !in_system_header)
4758 warning ("function declaration isn't a prototype");
4760 if (arg_types == error_mark_node)
4761 return 0; /* don't set TYPE_ARG_TYPES in this case */
4763 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4766 pedwarn ("parameter names (without types) in function declaration");
4768 ARG_INFO_PARMS (arg_info) = ARG_INFO_TYPES (arg_info);
4769 ARG_INFO_TYPES (arg_info) = 0;
4774 tree parm, type, typelt;
4775 unsigned int parmno;
4777 /* If the arg types are incomplete in a declaration, they must
4778 include undefined tags. These tags can never be defined in
4779 the scope of the declaration, so the types can never be
4780 completed, and no call can be compiled successfully. */
4782 for (parm = ARG_INFO_PARMS (arg_info), typelt = arg_types, parmno = 1;
4784 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4786 type = TREE_VALUE (typelt);
4787 if (type == error_mark_node)
4790 if (!COMPLETE_TYPE_P (type))
4794 if (DECL_NAME (parm))
4795 error ("%Jparameter %u ('%D') has incomplete type",
4796 parm, parmno, parm);
4798 error ("%Jparameter %u has incomplete type",
4801 TREE_VALUE (typelt) = error_mark_node;
4802 TREE_TYPE (parm) = error_mark_node;
4806 if (DECL_NAME (parm))
4807 warning ("%Jparameter %u ('%D') has incomplete type",
4808 parm, parmno, parm);
4810 warning ("%Jparameter %u has incomplete type",
4819 /* Take apart the current scope and return a tree_list node with info
4820 on a parameter list just parsed. This tree_list node should be
4821 examined using the ARG_INFO_* macros, defined above:
4823 ARG_INFO_PARMS: a list of parameter decls.
4824 ARG_INFO_TAGS: a list of structure, union and enum tags defined.
4825 ARG_INFO_TYPES: a list of argument types to go in the FUNCTION_TYPE.
4826 ARG_INFO_OTHERS: a list of non-parameter decls (notably enumeration
4827 constants) defined with the parameters.
4829 This tree_list node is later fed to 'grokparms' and 'store_parm_decls'.
4831 ELLIPSIS being true means the argument list ended in '...' so don't
4832 append a sentinel (void_list_node) to the end of the type-list. */
4835 get_parm_info (bool ellipsis)
4837 struct c_binding *b = current_scope->bindings;
4838 tree arg_info = make_node (TREE_LIST);
4844 static bool explained_incomplete_types = false;
4845 bool gave_void_only_once_err = false;
4847 /* The bindings in this scope must not get put into a block.
4848 We will take care of deleting the binding nodes. */
4849 current_scope->bindings = 0;
4851 /* This function is only called if there was *something* on the
4853 #ifdef ENABLE_CHECKING
4858 /* A parameter list consisting solely of 'void' indicates that the
4859 function takes no arguments. But if the 'void' is qualified
4860 (by 'const' or 'volatile'), or has a storage class specifier
4861 ('register'), then the behavior is undefined; issue an error.
4862 Typedefs for 'void' are OK (see DR#157). */
4863 if (b->prev == 0 /* one binding */
4864 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4865 && !DECL_NAME (b->decl) /* anonymous */
4866 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4868 if (TREE_THIS_VOLATILE (b->decl)
4869 || TREE_READONLY (b->decl)
4870 || C_DECL_REGISTER (b->decl))
4871 error ("'void' as only parameter may not be qualified");
4873 /* There cannot be an ellipsis. */
4875 error ("'void' must be the only parameter");
4877 ARG_INFO_TYPES (arg_info) = void_list_node;
4882 types = void_list_node;
4884 /* Break up the bindings list into parms, tags, types, and others;
4885 apply sanity checks; purge the name-to-decl bindings. */
4888 tree decl = b->decl;
4889 tree type = TREE_TYPE (decl);
4890 const char *keyword;
4892 switch (TREE_CODE (decl))
4897 #ifdef ENABLE_CHECKING
4898 if (I_SYMBOL_BINDING (b->id) != b) abort ();
4900 I_SYMBOL_BINDING (b->id) = b->shadowed;
4903 /* Check for forward decls that never got their actual decl. */
4904 if (TREE_ASM_WRITTEN (decl))
4905 error ("%Jparameter '%D' has just a forward declaration",
4907 /* Check for (..., void, ...) and issue an error. */
4908 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4910 if (!gave_void_only_once_err)
4912 error ("'void' must be the only parameter");
4913 gave_void_only_once_err = true;
4918 /* Valid parameter, add it to the list. */
4919 TREE_CHAIN (decl) = parms;
4922 /* Since there is a prototype, args are passed in their
4923 declared types. The back end may override this later. */
4924 DECL_ARG_TYPE (decl) = type;
4925 types = tree_cons (0, type, types);
4929 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4930 case UNION_TYPE: keyword = "union"; goto tag;
4931 case RECORD_TYPE: keyword = "struct"; goto tag;
4933 /* Types may not have tag-names, in which case the type
4934 appears in the bindings list with b->id NULL. */
4937 #ifdef ENABLE_CHECKING
4938 if (I_TAG_BINDING (b->id) != b) abort ();
4940 I_TAG_BINDING (b->id) = b->shadowed;
4943 /* Warn about any struct, union or enum tags defined in a
4944 parameter list. The scope of such types is limited to
4945 the parameter list, which is rarely if ever desirable
4946 (it's impossible to call such a function with type-
4947 correct arguments). An anonymous union parm type is
4948 meaningful as a GNU extension, so don't warn for that. */
4949 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4952 /* The %s will be one of 'struct', 'union', or 'enum'. */
4953 warning ("'%s %E' declared inside parameter list",
4956 /* The %s will be one of 'struct', 'union', or 'enum'. */
4957 warning ("anonymous %s declared inside parameter list",
4960 if (! explained_incomplete_types)
4962 warning ("its scope is only this definition or declaration,"
4963 " which is probably not what you want");
4964 explained_incomplete_types = true;
4968 tags = tree_cons (b->id, decl, tags);
4973 /* CONST_DECLs appear here when we have an embedded enum,
4974 and TYPE_DECLs appear here when we have an embedded struct
4975 or union. No warnings for this - we already warned about the
4977 TREE_CHAIN (decl) = others;
4982 /* error_mark_node appears here when we have an undeclared
4983 variable. Just throw it away. */
4986 #ifdef ENABLE_CHECKING
4987 if (I_SYMBOL_BINDING (b->id) != b) abort ();
4989 I_SYMBOL_BINDING (b->id) = b->shadowed;
4993 /* Other things that might be encountered. */
5001 b = free_binding_and_advance (b);
5004 ARG_INFO_PARMS (arg_info) = parms;
5005 ARG_INFO_TAGS (arg_info) = tags;
5006 ARG_INFO_TYPES (arg_info) = types;
5007 ARG_INFO_OTHERS (arg_info) = others;
5011 /* Get the struct, enum or union (CODE says which) with tag NAME.
5012 Define the tag as a forward-reference if it is not defined. */
5015 xref_tag (enum tree_code code, tree name)
5017 /* If a cross reference is requested, look up the type
5018 already defined for this tag and return it. */
5020 tree ref = lookup_tag (code, name, 0);
5021 /* If this is the right type of tag, return what we found.
5022 (This reference will be shadowed by shadow_tag later if appropriate.)
5023 If this is the wrong type of tag, do not return it. If it was the
5024 wrong type in the same scope, we will have had an error
5025 message already; if in a different scope and declaring
5026 a name, pending_xref_error will give an error message; but if in a
5027 different scope and not declaring a name, this tag should
5028 shadow the previous declaration of a different type of tag, and
5029 this would not work properly if we return the reference found.
5030 (For example, with "struct foo" in an outer scope, "union foo;"
5031 must shadow that tag with a new one of union type.) */
5032 if (ref && TREE_CODE (ref) == code)
5035 /* If no such tag is yet defined, create a forward-reference node
5036 and record it as the "definition".
5037 When a real declaration of this type is found,
5038 the forward-reference will be altered into a real type. */
5040 ref = make_node (code);
5041 if (code == ENUMERAL_TYPE)
5043 /* Give the type a default layout like unsigned int
5044 to avoid crashing if it does not get defined. */
5045 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5046 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5047 TYPE_USER_ALIGN (ref) = 0;
5048 TYPE_UNSIGNED (ref) = 1;
5049 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5050 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5051 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5054 pushtag (name, ref);
5059 /* Make sure that the tag NAME is defined *in the current scope*
5060 at least as a forward reference.
5061 CODE says which kind of tag NAME ought to be. */
5064 start_struct (enum tree_code code, tree name)
5066 /* If there is already a tag defined at this scope
5067 (as a forward reference), just return it. */
5072 ref = lookup_tag (code, name, 1);
5073 if (ref && TREE_CODE (ref) == code)
5075 if (TYPE_FIELDS (ref))
5077 if (code == UNION_TYPE)
5078 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
5080 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
5085 /* Otherwise create a forward-reference just so the tag is in scope. */
5087 ref = make_node (code);
5088 pushtag (name, ref);
5091 C_TYPE_BEING_DEFINED (ref) = 1;
5092 TYPE_PACKED (ref) = flag_pack_struct;
5096 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5097 of a structure component, returning a FIELD_DECL node.
5098 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5100 This is done during the parsing of the struct declaration.
5101 The FIELD_DECL nodes are chained together and the lot of them
5102 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5105 grokfield (tree declarator, tree declspecs, tree width)
5109 if (declarator == NULL_TREE && width == NULL_TREE)
5111 /* This is an unnamed decl.
5113 If we have something of the form "union { list } ;" then this
5114 is the anonymous union extension. Similarly for struct.
5116 If this is something of the form "struct foo;", then
5117 If MS extensions are enabled, this is handled as an
5119 Otherwise this is a forward declaration of a structure tag.
5121 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5122 If MS extensions are enabled and foo names a structure, then
5123 again this is an anonymous struct.
5124 Otherwise this is an error.
5126 Oh what a horrid tangled web we weave. I wonder if MS consciously
5127 took this from Plan 9 or if it was an accident of implementation
5128 that took root before someone noticed the bug... */
5130 tree type = TREE_VALUE (declspecs);
5132 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
5133 type = TREE_TYPE (type);
5134 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
5136 if (flag_ms_extensions)
5139 goto warn_unnamed_field;
5140 else if (TYPE_NAME (type) == NULL)
5143 goto warn_unnamed_field;
5148 warning ("declaration does not declare anything");
5153 value = grokdeclarator (declarator, declspecs, FIELD, false,
5154 width ? &width : NULL);
5156 finish_decl (value, NULL_TREE, NULL_TREE);
5157 DECL_INITIAL (value) = width;
5162 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5163 the list such that this does not present a problem later. */
5166 detect_field_duplicates (tree fieldlist)
5171 /* First, see if there are more than "a few" fields.
5172 This is trivially true if there are zero or one fields. */
5175 x = TREE_CHAIN (fieldlist);
5181 } while (timeout > 0 && x);
5183 /* If there were "few" fields, avoid the overhead of allocating
5184 a hash table. Instead just do the nested traversal thing. */
5187 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5190 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5191 if (DECL_NAME (y) == DECL_NAME (x))
5193 error ("%Jduplicate member '%D'", x, x);
5194 DECL_NAME (x) = NULL_TREE;
5200 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5203 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5204 if ((y = DECL_NAME (x)) != 0)
5206 slot = htab_find_slot (htab, y, INSERT);
5209 error ("%Jduplicate member '%D'", x, x);
5210 DECL_NAME (x) = NULL_TREE;
5219 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5220 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5221 ATTRIBUTES are attributes to be applied to the structure. */
5224 finish_struct (tree t, tree fieldlist, tree attributes)
5227 bool toplevel = file_scope == current_scope;
5228 int saw_named_field;
5230 /* If this type was previously laid out as a forward reference,
5231 make sure we lay it out again. */
5235 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5239 for (x = fieldlist; x; x = TREE_CHAIN (x))
5240 if (DECL_NAME (x) != 0)
5244 pedwarn ("%s has no %s",
5245 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5246 fieldlist ? _("named members") : _("members"));
5249 /* Install struct as DECL_CONTEXT of each field decl.
5250 Also process specified field sizes, found in the DECL_INITIAL,
5251 storing 0 there after the type has been changed to precision equal
5252 to its width, rather than the precision of the specified standard
5253 type. (Correct layout requires the original type to have been preserved
5256 saw_named_field = 0;
5257 for (x = fieldlist; x; x = TREE_CHAIN (x))
5259 DECL_CONTEXT (x) = t;
5260 DECL_PACKED (x) |= TYPE_PACKED (t);
5262 /* If any field is const, the structure type is pseudo-const. */
5263 if (TREE_READONLY (x))
5264 C_TYPE_FIELDS_READONLY (t) = 1;
5267 /* A field that is pseudo-const makes the structure likewise. */
5268 tree t1 = TREE_TYPE (x);
5269 while (TREE_CODE (t1) == ARRAY_TYPE)
5270 t1 = TREE_TYPE (t1);
5271 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5272 && C_TYPE_FIELDS_READONLY (t1))
5273 C_TYPE_FIELDS_READONLY (t) = 1;
5276 /* Any field that is volatile means variables of this type must be
5277 treated in some ways as volatile. */
5278 if (TREE_THIS_VOLATILE (x))
5279 C_TYPE_FIELDS_VOLATILE (t) = 1;
5281 /* Any field of nominal variable size implies structure is too. */
5282 if (C_DECL_VARIABLE_SIZE (x))
5283 C_TYPE_VARIABLE_SIZE (t) = 1;
5285 /* Detect invalid nested redefinition. */
5286 if (TREE_TYPE (x) == t)
5287 error ("nested redefinition of `%s'",
5288 IDENTIFIER_POINTER (TYPE_NAME (t)));
5290 if (DECL_INITIAL (x))
5292 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5293 DECL_SIZE (x) = bitsize_int (width);
5294 DECL_BIT_FIELD (x) = 1;
5295 SET_DECL_C_BIT_FIELD (x);
5298 /* Detect flexible array member in an invalid context. */
5299 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5300 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5301 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5302 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5304 if (TREE_CODE (t) == UNION_TYPE)
5306 error ("%Jflexible array member in union", x);
5307 TREE_TYPE (x) = error_mark_node;
5309 else if (TREE_CHAIN (x) != NULL_TREE)
5311 error ("%Jflexible array member not at end of struct", x);
5312 TREE_TYPE (x) = error_mark_node;
5314 else if (! saw_named_field)
5316 error ("%Jflexible array member in otherwise empty struct", x);
5317 TREE_TYPE (x) = error_mark_node;
5321 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5322 && flexible_array_type_p (TREE_TYPE (x)))
5323 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5326 saw_named_field = 1;
5329 detect_field_duplicates (fieldlist);
5331 /* Now we have the nearly final fieldlist. Record it,
5332 then lay out the structure or union (including the fields). */
5334 TYPE_FIELDS (t) = fieldlist;
5338 /* Give bit-fields their proper types. */
5340 tree *fieldlistp = &fieldlist;
5342 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5343 && TREE_TYPE (*fieldlistp) != error_mark_node)
5345 unsigned HOST_WIDE_INT width
5346 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5347 tree type = TREE_TYPE (*fieldlistp);
5348 if (width != TYPE_PRECISION (type))
5349 TREE_TYPE (*fieldlistp)
5350 = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
5351 DECL_INITIAL (*fieldlistp) = 0;
5354 fieldlistp = &TREE_CHAIN (*fieldlistp);
5357 /* Now we have the truly final field list.
5358 Store it in this type and in the variants. */
5360 TYPE_FIELDS (t) = fieldlist;
5362 /* If there are lots of fields, sort so we can look through them fast.
5363 We arbitrarily consider 16 or more elts to be "a lot". */
5368 for (x = fieldlist; x; x = TREE_CHAIN (x))
5370 if (len > 15 || DECL_NAME (x) == NULL)
5378 struct lang_type *space;
5379 struct sorted_fields_type *space2;
5381 len += list_length (x);
5383 /* Use the same allocation policy here that make_node uses, to
5384 ensure that this lives as long as the rest of the struct decl.
5385 All decls in an inline function need to be saved. */
5387 space = GGC_CNEW (struct lang_type);
5388 space2 = GGC_NEWVAR (struct sorted_fields_type,
5389 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5393 field_array = &space2->elts[0];
5394 for (x = fieldlist; x; x = TREE_CHAIN (x))
5396 field_array[len++] = x;
5398 /* If there is anonymous struct or union, break out of the loop. */
5399 if (DECL_NAME (x) == NULL)
5402 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5405 TYPE_LANG_SPECIFIC (t) = space;
5406 TYPE_LANG_SPECIFIC (t)->s->len = len;
5407 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5408 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5413 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5415 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5416 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5417 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5418 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5421 /* If this was supposed to be a transparent union, but we can't
5422 make it one, warn and turn off the flag. */
5423 if (TREE_CODE (t) == UNION_TYPE
5424 && TYPE_TRANSPARENT_UNION (t)
5425 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5427 TYPE_TRANSPARENT_UNION (t) = 0;
5428 warning ("union cannot be made transparent");
5431 /* If this structure or union completes the type of any previous
5432 variable declaration, lay it out and output its rtl. */
5433 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5437 tree decl = TREE_VALUE (x);
5438 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5439 layout_array_type (TREE_TYPE (decl));
5440 if (TREE_CODE (decl) != TYPE_DECL)
5442 layout_decl (decl, 0);
5443 if (c_dialect_objc ())
5444 objc_check_decl (decl);
5445 rest_of_decl_compilation (decl, toplevel, 0);
5450 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5452 /* Finish debugging output for this type. */
5453 rest_of_type_compilation (t, toplevel);
5458 /* Lay out the type T, and its element type, and so on. */
5461 layout_array_type (tree t)
5463 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5464 layout_array_type (TREE_TYPE (t));
5468 /* Begin compiling the definition of an enumeration type.
5469 NAME is its name (or null if anonymous).
5470 Returns the type object, as yet incomplete.
5471 Also records info about it so that build_enumerator
5472 may be used to declare the individual values as they are read. */
5475 start_enum (tree name)
5479 /* If this is the real definition for a previous forward reference,
5480 fill in the contents in the same object that used to be the
5481 forward reference. */
5484 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5486 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5488 enumtype = make_node (ENUMERAL_TYPE);
5489 pushtag (name, enumtype);
5492 C_TYPE_BEING_DEFINED (enumtype) = 1;
5494 if (TYPE_VALUES (enumtype) != 0)
5496 /* This enum is a named one that has been declared already. */
5497 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5499 /* Completely replace its old definition.
5500 The old enumerators remain defined, however. */
5501 TYPE_VALUES (enumtype) = 0;
5504 enum_next_value = integer_zero_node;
5507 if (flag_short_enums)
5508 TYPE_PACKED (enumtype) = 1;
5513 /* After processing and defining all the values of an enumeration type,
5514 install their decls in the enumeration type and finish it off.
5515 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5516 and ATTRIBUTES are the specified attributes.
5517 Returns ENUMTYPE. */
5520 finish_enum (tree enumtype, tree values, tree attributes)
5523 tree minnode = 0, maxnode = 0;
5524 int precision, unsign;
5525 bool toplevel = (file_scope == current_scope);
5526 struct lang_type *lt;
5528 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5530 /* Calculate the maximum value of any enumerator in this type. */
5532 if (values == error_mark_node)
5533 minnode = maxnode = integer_zero_node;
5536 minnode = maxnode = TREE_VALUE (values);
5537 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5539 tree value = TREE_VALUE (pair);
5540 if (tree_int_cst_lt (maxnode, value))
5542 if (tree_int_cst_lt (value, minnode))
5547 /* Construct the final type of this enumeration. It is the same
5548 as one of the integral types - the narrowest one that fits, except
5549 that normally we only go as narrow as int - and signed iff any of
5550 the values are negative. */
5551 unsign = (tree_int_cst_sgn (minnode) >= 0);
5552 precision = MAX (min_precision (minnode, unsign),
5553 min_precision (maxnode, unsign));
5554 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5556 tem = c_common_type_for_size (precision, unsign);
5559 warning ("enumeration values exceed range of largest integer");
5560 tem = long_long_integer_type_node;
5564 tem = unsign ? unsigned_type_node : integer_type_node;
5566 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5567 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5568 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5569 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5570 TYPE_SIZE (enumtype) = 0;
5571 layout_type (enumtype);
5573 if (values != error_mark_node)
5575 /* Change the type of the enumerators to be the enum type. We
5576 need to do this irrespective of the size of the enum, for
5577 proper type checking. Replace the DECL_INITIALs of the
5578 enumerators, and the value slots of the list, with copies
5579 that have the enum type; they cannot be modified in place
5580 because they may be shared (e.g. integer_zero_node) Finally,
5581 change the purpose slots to point to the names of the decls. */
5582 for (pair = values; pair; pair = TREE_CHAIN (pair))
5584 tree enu = TREE_PURPOSE (pair);
5585 tree ini = DECL_INITIAL (enu);
5587 TREE_TYPE (enu) = enumtype;
5589 /* The ISO C Standard mandates enumerators to have type int,
5590 even though the underlying type of an enum type is
5591 unspecified. Here we convert any enumerators that fit in
5592 an int to type int, to avoid promotions to unsigned types
5593 when comparing integers with enumerators that fit in the
5594 int range. When -pedantic is given, build_enumerator()
5595 would have already taken care of those that don't fit. */
5596 if (int_fits_type_p (ini, integer_type_node))
5597 tem = integer_type_node;
5600 ini = convert (tem, ini);
5602 DECL_INITIAL (enu) = ini;
5603 TREE_PURPOSE (pair) = DECL_NAME (enu);
5604 TREE_VALUE (pair) = ini;
5607 TYPE_VALUES (enumtype) = values;
5610 /* Record the min/max values so that we can warn about bit-field
5611 enumerations that are too small for the values. */
5612 lt = GGC_CNEW (struct lang_type);
5613 lt->enum_min = minnode;
5614 lt->enum_max = maxnode;
5615 TYPE_LANG_SPECIFIC (enumtype) = lt;
5617 /* Fix up all variant types of this enum type. */
5618 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5620 if (tem == enumtype)
5622 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5623 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5624 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5625 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5626 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5627 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5628 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5629 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5630 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5631 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5632 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5635 /* Finish debugging output for this type. */
5636 rest_of_type_compilation (enumtype, toplevel);
5641 /* Build and install a CONST_DECL for one value of the
5642 current enumeration type (one that was begun with start_enum).
5643 Return a tree-list containing the CONST_DECL and its value.
5644 Assignment of sequential values by default is handled here. */
5647 build_enumerator (tree name, tree value)
5651 /* Validate and default VALUE. */
5653 /* Remove no-op casts from the value. */
5655 STRIP_TYPE_NOPS (value);
5659 /* Don't issue more errors for error_mark_node (i.e. an
5660 undeclared identifier) - just ignore the value expression. */
5661 if (value == error_mark_node)
5663 else if (TREE_CODE (value) != INTEGER_CST)
5665 error ("enumerator value for '%E' is not an integer constant", name);
5670 value = default_conversion (value);
5671 constant_expression_warning (value);
5675 /* Default based on previous value. */
5676 /* It should no longer be possible to have NON_LVALUE_EXPR
5680 value = enum_next_value;
5682 error ("overflow in enumeration values");
5685 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5687 pedwarn ("ISO C restricts enumerator values to range of `int'");
5688 /* XXX This causes -pedantic to change the meaning of the program.
5689 Remove? -zw 2004-03-15 */
5690 value = convert (integer_type_node, value);
5693 /* Set basis for default for next value. */
5694 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5695 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5697 /* Now create a declaration for the enum value name. */
5699 type = TREE_TYPE (value);
5700 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5701 TYPE_PRECISION (integer_type_node)),
5702 (TYPE_PRECISION (type)
5703 >= TYPE_PRECISION (integer_type_node)
5704 && TYPE_UNSIGNED (type)));
5706 decl = build_decl (CONST_DECL, name, type);
5707 DECL_INITIAL (decl) = convert (type, value);
5710 return tree_cons (decl, value, NULL_TREE);
5714 /* Create the FUNCTION_DECL for a function definition.
5715 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5716 the declaration; they describe the function's name and the type it returns,
5717 but twisted together in a fashion that parallels the syntax of C.
5719 This function creates a binding context for the function body
5720 as well as setting up the FUNCTION_DECL in current_function_decl.
5722 Returns 1 on success. If the DECLARATOR is not suitable for a function
5723 (it defines a datum instead), we return 0, which tells
5724 yyparse to report a parse error. */
5727 start_function (tree declspecs, tree declarator, tree attributes)
5729 tree decl1, old_decl;
5730 tree restype, resdecl;
5732 current_function_returns_value = 0; /* Assume, until we see it does. */
5733 current_function_returns_null = 0;
5734 current_function_returns_abnormally = 0;
5735 warn_about_return_type = 0;
5736 current_extern_inline = 0;
5737 c_switch_stack = NULL;
5739 /* Indicate no valid break/continue context by setting these variables
5740 to some non-null, non-label value. We'll notice and emit the proper
5741 error message in c_finish_bc_stmt. */
5742 c_break_label = c_cont_label = size_zero_node;
5744 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5746 /* If the declarator is not suitable for a function definition,
5747 cause a syntax error. */
5751 decl_attributes (&decl1, attributes, 0);
5753 if (DECL_DECLARED_INLINE_P (decl1)
5754 && DECL_UNINLINABLE (decl1)
5755 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5756 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5758 announce_function (decl1);
5760 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5762 error ("return type is an incomplete type");
5763 /* Make it return void instead. */
5765 = build_function_type (void_type_node,
5766 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5769 if (warn_about_return_type)
5770 pedwarn_c99 ("return type defaults to `int'");
5772 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5773 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5774 DECL_INITIAL (decl1) = error_mark_node;
5776 /* If this definition isn't a prototype and we had a prototype declaration
5777 before, copy the arg type info from that prototype.
5778 But not if what we had before was a builtin function. */
5779 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5780 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5781 && !DECL_BUILT_IN (old_decl)
5782 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5783 TREE_TYPE (TREE_TYPE (old_decl)))
5784 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5786 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5788 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5791 /* Optionally warn of old-fashioned def with no previous prototype. */
5792 if (warn_strict_prototypes
5793 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5794 && C_DECL_ISNT_PROTOTYPE (old_decl))
5795 warning ("function declaration isn't a prototype");
5796 /* Optionally warn of any global def with no previous prototype. */
5797 else if (warn_missing_prototypes
5798 && TREE_PUBLIC (decl1)
5799 && ! MAIN_NAME_P (DECL_NAME (decl1))
5800 && C_DECL_ISNT_PROTOTYPE (old_decl))
5801 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5802 /* Optionally warn of any def with no previous prototype
5803 if the function has already been used. */
5804 else if (warn_missing_prototypes
5805 && old_decl != 0 && TREE_USED (old_decl)
5806 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5807 warning ("%J'%D' was used with no prototype before its definition",
5809 /* Optionally warn of any global def with no previous declaration. */
5810 else if (warn_missing_declarations
5811 && TREE_PUBLIC (decl1)
5813 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5814 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5815 /* Optionally warn of any def with no previous declaration
5816 if the function has already been used. */
5817 else if (warn_missing_declarations
5818 && old_decl != 0 && TREE_USED (old_decl)
5819 && C_DECL_IMPLICIT (old_decl))
5820 warning ("%J`%D' was used with no declaration before its definition",
5823 /* This is a definition, not a reference.
5824 So normally clear DECL_EXTERNAL.
5825 However, `extern inline' acts like a declaration
5826 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5827 DECL_EXTERNAL (decl1) = current_extern_inline;
5829 /* This function exists in static storage.
5830 (This does not mean `static' in the C sense!) */
5831 TREE_STATIC (decl1) = 1;
5833 /* A nested function is not global. */
5834 if (current_function_decl != 0)
5835 TREE_PUBLIC (decl1) = 0;
5837 #ifdef ENABLE_CHECKING
5838 /* This is the earliest point at which we might know the assembler
5839 name of the function. Thus, if it's set before this, die horribly. */
5840 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5844 /* If #pragma weak was used, mark the decl weak now. */
5845 if (current_scope == file_scope)
5846 maybe_apply_pragma_weak (decl1);
5848 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5849 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5854 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5855 != integer_type_node)
5856 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5858 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5859 args = TREE_CHAIN (args))
5861 tree type = args ? TREE_VALUE (args) : 0;
5863 if (type == void_type_node)
5870 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5871 pedwarn ("%Jfirst argument of '%D' should be `int'",
5876 if (TREE_CODE (type) != POINTER_TYPE
5877 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5878 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5880 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5885 if (TREE_CODE (type) != POINTER_TYPE
5886 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5887 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5889 pedwarn ("%Jthird argument of '%D' should probably be "
5890 "'char **'", decl1, decl1);
5895 /* It is intentional that this message does not mention the third
5896 argument because it's only mentioned in an appendix of the
5898 if (argct > 0 && (argct < 2 || argct > 3))
5899 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5901 if (! TREE_PUBLIC (decl1))
5902 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5905 /* Record the decl so that the function name is defined.
5906 If we already have a decl for this name, and it is a FUNCTION_DECL,
5907 use the old decl. */
5909 current_function_decl = pushdecl (decl1);
5912 declare_parm_level ();
5914 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5915 /* Promote the value to int before returning it. */
5916 if (c_promoting_integer_type_p (restype))
5918 /* It retains unsignedness if not really getting wider. */
5919 if (TYPE_UNSIGNED (restype)
5920 && (TYPE_PRECISION (restype)
5921 == TYPE_PRECISION (integer_type_node)))
5922 restype = unsigned_type_node;
5924 restype = integer_type_node;
5927 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
5928 DECL_ARTIFICIAL (resdecl) = 1;
5929 DECL_IGNORED_P (resdecl) = 1;
5930 DECL_RESULT (current_function_decl) = resdecl;
5932 start_fname_decls ();
5937 /* Subroutine of store_parm_decls which handles new-style function
5938 definitions (prototype format). The parms already have decls, so we
5939 need only record them as in effect and complain if any redundant
5940 old-style parm decls were written. */
5942 store_parm_decls_newstyle (tree fndecl, tree arg_info)
5945 tree parms = ARG_INFO_PARMS (arg_info);
5946 tree tags = ARG_INFO_TAGS (arg_info);
5947 tree others = ARG_INFO_OTHERS (arg_info);
5949 if (current_scope->bindings)
5951 error ("%Jold-style parameter declarations in prototyped "
5952 "function definition", fndecl);
5954 /* Get rid of the old-style declarations. */
5958 /* Don't issue this warning for nested functions, and don't issue this
5959 warning if we got here because ARG_INFO_TYPES was error_mark_node
5960 (this happens when a function definition has just an ellipsis in
5961 its parameter list). */
5962 else if (warn_traditional && !in_system_header && !current_function_scope
5963 && ARG_INFO_TYPES (arg_info) != error_mark_node)
5964 warning ("%Jtraditional C rejects ISO C style function definitions",
5967 /* Now make all the parameter declarations visible in the function body.
5968 We can bypass most of the grunt work of pushdecl. */
5969 for (decl = parms; decl; decl = TREE_CHAIN (decl))
5971 DECL_CONTEXT (decl) = current_function_decl;
5972 if (DECL_NAME (decl))
5973 bind (DECL_NAME (decl), decl, current_scope,
5974 /*invisible=*/false, /*nested=*/false);
5976 error ("%Jparameter name omitted", decl);
5979 /* Record the parameter list in the function declaration. */
5980 DECL_ARGUMENTS (fndecl) = parms;
5982 /* Now make all the ancillary declarations visible, likewise. */
5983 for (decl = others; decl; decl = TREE_CHAIN (decl))
5985 DECL_CONTEXT (decl) = current_function_decl;
5986 if (DECL_NAME (decl))
5987 bind (DECL_NAME (decl), decl, current_scope,
5988 /*invisible=*/false, /*nested=*/false);
5991 /* And all the tag declarations. */
5992 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5993 if (TREE_PURPOSE (decl))
5994 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
5995 /*invisible=*/false, /*nested=*/false);
5998 /* Subroutine of store_parm_decls which handles old-style function
5999 definitions (separate parameter list and declarations). */
6002 store_parm_decls_oldstyle (tree fndecl, tree arg_info)
6004 struct c_binding *b;
6005 tree parm, decl, last;
6006 tree parmids = ARG_INFO_PARMS (arg_info);
6008 /* We use DECL_WEAK as a flag to show which parameters have been
6009 seen already, since it is not used on PARM_DECL. */
6010 #ifdef ENABLE_CHECKING
6011 for (b = current_scope->bindings; b; b = b->prev)
6012 if (TREE_CODE (b->decl) == PARM_DECL && DECL_WEAK (b->decl))
6016 if (warn_old_style_definition && !in_system_header)
6017 warning ("%Jold-style function definition", fndecl);
6019 /* Match each formal parameter name with its declaration. Save each
6020 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6021 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6023 if (TREE_VALUE (parm) == 0)
6025 error ("%Jparameter name missing from parameter list", fndecl);
6026 TREE_PURPOSE (parm) = 0;
6030 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6031 if (b && B_IN_CURRENT_SCOPE (b))
6034 /* If we got something other than a PARM_DECL it is an error. */
6035 if (TREE_CODE (decl) != PARM_DECL)
6036 error ("%J'%D' declared as a non-parameter", decl, decl);
6037 /* If the declaration is already marked, we have a duplicate
6038 name. Complain and ignore the duplicate. */
6039 else if (DECL_WEAK (decl))
6041 error ("%Jmultiple parameters named '%D'", decl, decl);
6042 TREE_PURPOSE (parm) = 0;
6045 /* If the declaration says "void", complain and turn it into
6047 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6049 error ("%Jparameter '%D' declared with void type", decl, decl);
6050 TREE_TYPE (decl) = integer_type_node;
6051 DECL_ARG_TYPE (decl) = integer_type_node;
6052 layout_decl (decl, 0);
6055 /* If no declaration found, default to int. */
6058 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6059 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6060 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6064 pedwarn ("%Jtype of '%D' defaults to 'int'", decl, decl);
6065 else if (extra_warnings)
6066 warning ("%Jtype of '%D' defaults to 'int'", decl, decl);
6069 TREE_PURPOSE (parm) = decl;
6070 DECL_WEAK (decl) = 1;
6073 /* Now examine the parms chain for incomplete declarations
6074 and declarations with no corresponding names. */
6076 for (b = current_scope->bindings; b; b = b->prev)
6079 if (TREE_CODE (parm) != PARM_DECL)
6082 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6084 error ("%Jparameter '%D' has incomplete type", parm, parm);
6085 TREE_TYPE (parm) = error_mark_node;
6088 if (! DECL_WEAK (parm))
6090 error ("%Jdeclaration for parameter '%D' but no such parameter",
6093 /* Pretend the parameter was not missing.
6094 This gets us to a standard state and minimizes
6095 further error messages. */
6096 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6100 /* Chain the declarations together in the order of the list of
6101 names. Store that chain in the function decl, replacing the
6102 list of names. Update the current scope to match. */
6103 DECL_ARGUMENTS (fndecl) = 0;
6105 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6106 if (TREE_PURPOSE (parm))
6108 if (parm && TREE_PURPOSE (parm))
6110 last = TREE_PURPOSE (parm);
6111 DECL_ARGUMENTS (fndecl) = last;
6112 DECL_WEAK (last) = 0;
6114 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6115 if (TREE_PURPOSE (parm))
6117 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6118 last = TREE_PURPOSE (parm);
6119 DECL_WEAK (last) = 0;
6121 TREE_CHAIN (last) = 0;
6124 /* If there was a previous prototype,
6125 set the DECL_ARG_TYPE of each argument according to
6126 the type previously specified, and report any mismatches. */
6128 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6131 for (parm = DECL_ARGUMENTS (fndecl),
6132 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6133 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6134 != void_type_node));
6135 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6137 if (parm == 0 || type == 0
6138 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6140 error ("number of arguments doesn't match prototype");
6141 error ("%Hprototype declaration",
6142 ¤t_function_prototype_locus);
6145 /* Type for passing arg must be consistent with that
6146 declared for the arg. ISO C says we take the unqualified
6147 type for parameters declared with qualified type. */
6148 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6149 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6151 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6152 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6154 /* Adjust argument to match prototype. E.g. a previous
6155 `int foo(float);' prototype causes
6156 `int foo(x) float x; {...}' to be treated like
6157 `int foo(float x) {...}'. This is particularly
6158 useful for argument types like uid_t. */
6159 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6161 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6162 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6163 && TYPE_PRECISION (TREE_TYPE (parm))
6164 < TYPE_PRECISION (integer_type_node))
6165 DECL_ARG_TYPE (parm) = integer_type_node;
6169 pedwarn ("promoted argument '%D' "
6170 "doesn't match prototype", parm);
6171 pedwarn ("%Hprototype declaration",
6172 ¤t_function_prototype_locus);
6177 error ("argument '%D' doesn't match prototype", parm);
6178 error ("%Hprototype declaration",
6179 ¤t_function_prototype_locus);
6183 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6186 /* Otherwise, create a prototype that would match. */
6190 tree actual = 0, last = 0, type;
6192 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6194 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6196 TREE_CHAIN (last) = type;
6201 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6203 TREE_CHAIN (last) = type;
6207 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6208 of the type of this function, but we need to avoid having this
6209 affect the types of other similarly-typed functions, so we must
6210 first force the generation of an identical (but separate) type
6211 node for the relevant function type. The new node we create
6212 will be a variant of the main variant of the original function
6215 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6217 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6221 /* Store the parameter declarations into the current function declaration.
6222 This is called after parsing the parameter declarations, before
6223 digesting the body of the function.
6225 For an old-style definition, construct a prototype out of the old-style
6226 parameter declarations and inject it into the function's type. */
6229 store_parm_decls (void)
6231 tree fndecl = current_function_decl;
6233 /* The argument information block for FNDECL. */
6234 tree arg_info = DECL_ARGUMENTS (fndecl);
6236 /* True if this definition is written with a prototype. Note:
6237 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6238 list in a function definition as equivalent to (void) -- an
6239 empty argument list specifies the function has no parameters,
6240 but only (void) sets up a prototype for future calls. */
6241 bool proto = ARG_INFO_TYPES (arg_info) != 0;
6244 store_parm_decls_newstyle (fndecl, arg_info);
6246 store_parm_decls_oldstyle (fndecl, arg_info);
6248 /* The next call to push_scope will be a function body. */
6250 next_is_function_body = true;
6252 /* Write a record describing this function definition to the prototypes
6253 file (if requested). */
6255 gen_aux_info_record (fndecl, 1, 0, proto);
6257 /* Initialize the RTL code for the function. */
6258 allocate_struct_function (fndecl);
6260 /* Begin the statement tree for this function. */
6261 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6263 /* ??? Insert the contents of the pending sizes list into the function
6264 to be evaluated. This just changes mis-behaviour until assign_parms
6265 phase ordering problems are resolved. */
6268 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6269 add_stmt (TREE_VALUE (t));
6272 /* Even though we're inside a function body, we still don't want to
6273 call expand_expr to calculate the size of a variable-sized array.
6274 We haven't necessarily assigned RTL to all variables yet, so it's
6275 not safe to try to expand expressions involving them. */
6276 cfun->x_dont_save_pending_sizes_p = 1;
6279 /* Give FNDECL and all its nested functions to cgraph for compilation. */
6282 c_finalize (tree fndecl)
6284 struct cgraph_node *cgn;
6286 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6287 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6289 /* ??? Objc emits functions after finalizing the compilation unit.
6290 This should be cleaned up later and this conditional removed. */
6291 if (cgraph_global_info_ready)
6293 c_expand_body (fndecl);
6297 /* Finalize all nested functions now. */
6298 cgn = cgraph_node (fndecl);
6299 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6300 c_finalize (cgn->decl);
6302 cgraph_finalize_function (fndecl, false);
6305 /* Finish up a function declaration and compile that function
6306 all the way to assembler language output. The free the storage
6307 for the function definition.
6309 This is called after parsing the body of the function definition. */
6312 finish_function (void)
6314 tree fndecl = current_function_decl;
6316 if (TREE_CODE (fndecl) == FUNCTION_DECL
6317 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6319 tree args = DECL_ARGUMENTS (fndecl);
6320 for (; args; args = TREE_CHAIN (args))
6322 tree type = TREE_TYPE (args);
6323 if (INTEGRAL_TYPE_P (type)
6324 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6325 DECL_ARG_TYPE (args) = integer_type_node;
6329 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6330 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6332 /* Must mark the RESULT_DECL as being in this function. */
6334 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6335 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6337 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6339 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6340 != integer_type_node)
6342 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6343 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6345 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6350 c_finish_return (integer_zero_node);
6354 /* Tie off the statement tree for this function. */
6355 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6357 finish_fname_decls ();
6359 /* Complain if there's just no return statement. */
6360 if (warn_return_type
6361 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6362 && !current_function_returns_value && !current_function_returns_null
6363 /* Don't complain if we abort. */
6364 && !current_function_returns_abnormally
6365 /* Don't warn for main(). */
6366 && !MAIN_NAME_P (DECL_NAME (fndecl))
6367 /* Or if they didn't actually specify a return type. */
6368 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6369 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6370 inline function, as we might never be compiled separately. */
6371 && DECL_INLINE (fndecl))
6372 warning ("no return statement in function returning non-void");
6374 /* With just -Wextra, complain only if function returns both with
6375 and without a value. */
6377 && current_function_returns_value
6378 && current_function_returns_null)
6379 warning ("this function may return with or without a value");
6381 /* Store the end of the function, so that we get good line number
6382 info for the epilogue. */
6383 cfun->function_end_locus = input_location;
6385 /* If we don't have ctors/dtors sections, and this is a static
6386 constructor or destructor, it must be recorded now. */
6387 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6388 && !targetm.have_ctors_dtors)
6389 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6390 if (DECL_STATIC_DESTRUCTOR (fndecl)
6391 && !targetm.have_ctors_dtors)
6392 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6394 /* Finalize the ELF visibility for the function. */
6395 c_determine_visibility (fndecl);
6397 /* Genericize before inlining. Delay genericizing nested functions
6398 until their parent function is genericized. Since finalizing
6399 requires GENERIC, delay that as well. */
6401 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6403 if (!decl_function_context (fndecl))
6405 c_genericize (fndecl);
6406 lower_nested_functions (fndecl);
6407 c_finalize (fndecl);
6411 /* Register this function with cgraph just far enough to get it
6412 added to our parent's nested function list. Handy, since the
6413 C front end doesn't have such a list. */
6414 (void) cgraph_node (fndecl);
6418 /* We're leaving the context of this function, so zap cfun.
6419 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6420 tree_rest_of_compilation. */
6422 current_function_decl = NULL;
6425 /* Generate the RTL for the body of FNDECL. */
6428 c_expand_body (tree fndecl)
6431 if (!DECL_INITIAL (fndecl)
6432 || DECL_INITIAL (fndecl) == error_mark_node)
6435 tree_rest_of_compilation (fndecl, false);
6437 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6438 && targetm.have_ctors_dtors)
6439 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6440 DEFAULT_INIT_PRIORITY);
6441 if (DECL_STATIC_DESTRUCTOR (fndecl)
6442 && targetm.have_ctors_dtors)
6443 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6444 DEFAULT_INIT_PRIORITY);
6447 /* Check the declarations given in a for-loop for satisfying the C99
6450 check_for_loop_decls (void)
6452 struct c_binding *b;
6456 /* If we get here, declarations have been used in a for loop without
6457 the C99 for loop scope. This doesn't make much sense, so don't
6459 error ("'for' loop initial declaration used outside C99 mode");
6462 /* C99 subclause 6.8.5 paragraph 3:
6464 [#3] The declaration part of a for statement shall only
6465 declare identifiers for objects having storage class auto or
6468 It isn't clear whether, in this sentence, "identifiers" binds to
6469 "shall only declare" or to "objects" - that is, whether all identifiers
6470 declared must be identifiers for objects, or whether the restriction
6471 only applies to those that are. (A question on this in comp.std.c
6472 in November 2000 received no answer.) We implement the strictest
6473 interpretation, to avoid creating an extension which later causes
6476 for (b = current_scope->bindings; b; b = b->prev)
6479 tree decl = b->decl;
6484 switch (TREE_CODE (decl))
6487 if (TREE_STATIC (decl))
6488 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6489 "initial declaration", decl, decl);
6490 else if (DECL_EXTERNAL (decl))
6491 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6492 "initial declaration", decl, decl);
6496 error ("'struct %E' declared in 'for' loop initial declaration", id);
6499 error ("'union %E' declared in 'for' loop initial declaration", id);
6502 error ("'enum %E' declared in 'for' loop initial declaration", id);
6505 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6506 "initial declaration", decl, decl);
6511 /* Save and reinitialize the variables
6512 used during compilation of a C function. */
6515 c_push_function_context (struct function *f)
6517 struct language_function *p;
6518 p = GGC_NEW (struct language_function);
6521 p->base.x_stmt_tree = c_stmt_tree;
6522 p->x_break_label = c_break_label;
6523 p->x_cont_label = c_cont_label;
6524 p->x_switch_stack = c_switch_stack;
6525 p->returns_value = current_function_returns_value;
6526 p->returns_null = current_function_returns_null;
6527 p->returns_abnormally = current_function_returns_abnormally;
6528 p->warn_about_return_type = warn_about_return_type;
6529 p->extern_inline = current_extern_inline;
6532 /* Restore the variables used during compilation of a C function. */
6535 c_pop_function_context (struct function *f)
6537 struct language_function *p = f->language;
6539 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6540 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6542 /* Stop pointing to the local nodes about to be freed. */
6543 /* But DECL_INITIAL must remain nonzero so we know this
6544 was an actual function definition. */
6545 DECL_INITIAL (current_function_decl) = error_mark_node;
6546 DECL_ARGUMENTS (current_function_decl) = 0;
6549 c_stmt_tree = p->base.x_stmt_tree;
6550 c_break_label = p->x_break_label;
6551 c_cont_label = p->x_cont_label;
6552 c_switch_stack = p->x_switch_stack;
6553 current_function_returns_value = p->returns_value;
6554 current_function_returns_null = p->returns_null;
6555 current_function_returns_abnormally = p->returns_abnormally;
6556 warn_about_return_type = p->warn_about_return_type;
6557 current_extern_inline = p->extern_inline;
6562 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6565 c_dup_lang_specific_decl (tree decl)
6567 struct lang_decl *ld;
6569 if (!DECL_LANG_SPECIFIC (decl))
6572 ld = GGC_NEW (struct lang_decl);
6573 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6574 DECL_LANG_SPECIFIC (decl) = ld;
6577 /* The functions below are required for functionality of doing
6578 function at once processing in the C front end. Currently these
6579 functions are not called from anywhere in the C front end, but as
6580 these changes continue, that will change. */
6582 /* Returns nonzero if the current statement is a full expression,
6583 i.e. temporaries created during that statement should be destroyed
6584 at the end of the statement. */
6587 stmts_are_full_exprs_p (void)
6592 /* Returns the stmt_tree (if any) to which statements are currently
6593 being added. If there is no active statement-tree, NULL is
6597 current_stmt_tree (void)
6599 return &c_stmt_tree;
6602 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6606 anon_aggr_type_p (tree ARG_UNUSED (node))
6611 /* Dummy function in place of callback used by C++. */
6614 extract_interface_info (void)
6618 /* Return the global value of T as a symbol. */
6621 identifier_global_value (tree t)
6623 struct c_binding *b;
6625 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6626 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6632 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6633 otherwise the name is found in ridpointers from RID_INDEX. */
6636 record_builtin_type (enum rid rid_index, const char *name, tree type)
6640 id = ridpointers[(int) rid_index];
6642 id = get_identifier (name);
6643 decl = build_decl (TYPE_DECL, id, type);
6645 if (debug_hooks->type_decl)
6646 debug_hooks->type_decl (decl, false);
6649 /* Build the void_list_node (void_type_node having been created). */
6651 build_void_list_node (void)
6653 tree t = build_tree_list (NULL_TREE, void_type_node);
6657 /* Return a structure for a parameter with the given SPECS, ATTRS and
6661 build_c_parm (tree specs, tree attrs, tree declarator)
6663 return build_tree_list (build_tree_list (specs, declarator), attrs);
6666 /* Return a declarator with nested attributes. TARGET is the inner
6667 declarator to which these attributes apply. ATTRS are the
6671 build_attrs_declarator (tree attrs, tree target)
6673 return tree_cons (attrs, target, NULL_TREE);
6676 /* Return a declarator for a function with arguments specified by ARGS
6677 and return type specified by TARGET. */
6680 build_function_declarator (tree args, tree target)
6682 return build_nt (CALL_EXPR, target, args, NULL_TREE);
6685 /* Return something to represent absolute declarators containing a *.
6686 TARGET is the absolute declarator that the * contains.
6687 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6688 to apply to the pointer type, represented as identifiers, possible mixed
6691 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6692 if attributes are present) and whose type is the modifier list. */
6695 make_pointer_declarator (tree type_quals_attrs, tree target)
6698 tree itarget = target;
6699 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6700 if (attrs != NULL_TREE)
6701 itarget = build_attrs_declarator (attrs, target);
6702 return build1 (INDIRECT_REF, quals, itarget);
6705 /* Synthesize a function which calls all the global ctors or global
6706 dtors in this file. This is only used for targets which do not
6707 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
6709 build_cdtor (int method_type, tree cdtors)
6716 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
6717 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
6720 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
6723 /* Perform final processing on one file scope's declarations (or the
6724 external scope's declarations), GLOBALS. */
6726 c_write_global_declarations_1 (tree globals)
6728 size_t len = list_length (globals);
6729 tree *vec = XNEWVEC (tree, len);
6733 /* Process the decls in the order they were written. */
6734 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6737 wrapup_global_declarations (vec, len);
6738 check_global_declarations (vec, len);
6744 c_write_global_declarations (void)
6748 /* We don't want to do this if generating a PCH. */
6752 /* Don't waste time on further processing if -fsyntax-only or we've
6753 encountered errors. */
6754 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
6757 /* Close the external scope. */
6758 ext_block = pop_scope ();
6763 /* Process all file scopes in this compilation, and the external_scope,
6764 through wrapup_global_declarations and check_global_declarations. */
6765 for (t = all_translation_units; t; t = TREE_CHAIN (t))
6766 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
6767 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
6769 /* Generate functions to call static constructors and destructors
6770 for targets that do not support .ctors/.dtors sections. These
6771 functions have magic names which are detected by collect2. */
6772 build_cdtor ('I', static_ctors); static_ctors = 0;
6773 build_cdtor ('D', static_dtors); static_dtors = 0;
6775 /* We're done parsing; proceed to optimize and emit assembly.
6776 FIXME: shouldn't be the front end's responsibility to call this. */
6779 /* Presently this has to happen after cgraph_optimize.
6780 FIXME: shouldn't be the front end's responsibility to call this. */
6782 mudflap_finish_file ();
6785 #include "gt-c-decl.h"