1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
36 #include "tree-inline.h"
53 #include "langhooks.h"
54 #include "tree-mudflap.h"
55 #include "tree-gimple.h"
56 #include "diagnostic.h"
57 #include "tree-dump.h"
62 #include "langhooks-def.h"
63 #include "pointer-set.h"
65 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
67 { NORMAL, /* Ordinary declaration */
68 FUNCDEF, /* Function definition */
69 PARM, /* Declaration of parm before function body */
70 FIELD, /* Declaration inside struct or union */
71 TYPENAME}; /* Typename (inside cast or sizeof) */
74 /* Nonzero if we have seen an invalid cross reference
75 to a struct, union, or enum, but not yet printed the message. */
76 tree pending_invalid_xref;
78 /* File and line to appear in the eventual error message. */
79 location_t pending_invalid_xref_location;
81 /* True means we've initialized exception handling. */
82 bool c_eh_initialized_p;
84 /* While defining an enum type, this is 1 plus the last enumerator
85 constant value. Note that will do not have to save this or `enum_overflow'
86 around nested function definition since such a definition could only
87 occur in an enum value expression and we don't use these variables in
90 static tree enum_next_value;
92 /* Nonzero means that there was overflow computing enum_next_value. */
94 static int enum_overflow;
96 /* The file and line that the prototype came from if this is an
97 old-style definition; used for diagnostics in
98 store_parm_decls_oldstyle. */
100 static location_t current_function_prototype_locus;
102 /* Whether this prototype was built-in. */
104 static bool current_function_prototype_built_in;
106 /* The argument type information of this prototype. */
108 static tree current_function_prototype_arg_types;
110 /* The argument information structure for the function currently being
113 static struct c_arg_info *current_function_arg_info;
115 /* The obstack on which parser and related data structures, which are
116 not live beyond their top-level declaration or definition, are
118 struct obstack parser_obstack;
120 /* The current statement tree. */
122 static GTY(()) struct stmt_tree_s c_stmt_tree;
124 /* State saving variables. */
128 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
129 included in this invocation. Note that the current translation
130 unit is not included in this list. */
132 static GTY(()) tree all_translation_units;
134 /* A list of decls to be made automatically visible in each file scope. */
135 static GTY(()) tree visible_builtins;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a return statement that specifies a return value is seen. */
140 int current_function_returns_value;
142 /* Set to 0 at beginning of a function definition, set to 1 if
143 a return statement with no argument is seen. */
145 int current_function_returns_null;
147 /* Set to 0 at beginning of a function definition, set to 1 if
148 a call to a noreturn function is seen. */
150 int current_function_returns_abnormally;
152 /* Set to nonzero by `grokdeclarator' for a function
153 whose return type is defaulted, if warnings for this are desired. */
155 static int warn_about_return_type;
157 /* Nonzero when starting a function declared `extern inline'. */
159 static int current_extern_inline;
161 /* Nonzero when the current toplevel function contains a declaration
162 of a nested function which is never defined. */
164 static bool undef_nested_function;
166 /* True means global_bindings_p should return false even if the scope stack
167 says we are in file scope. */
168 bool c_override_global_bindings_to_false;
171 /* Each c_binding structure describes one binding of an identifier to
172 a decl. All the decls in a scope - irrespective of namespace - are
173 chained together by the ->prev field, which (as the name implies)
174 runs in reverse order. All the decls in a given namespace bound to
175 a given identifier are chained by the ->shadowed field, which runs
176 from inner to outer scopes.
178 The ->decl field usually points to a DECL node, but there are two
179 exceptions. In the namespace of type tags, the bound entity is a
180 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
181 identifier is encountered, it is bound to error_mark_node to
182 suppress further errors about that identifier in the current
185 The ->type field stores the type of the declaration in this scope;
186 if NULL, the type is the type of the ->decl field. This is only of
187 relevance for objects with external or internal linkage which may
188 be redeclared in inner scopes, forming composite types that only
189 persist for the duration of those scopes. In the external scope,
190 this stores the composite of all the types declared for this
191 object, visible or not. The ->inner_comp field (used only at file
192 scope) stores whether an incomplete array type at file scope was
193 completed at an inner scope to an array size other than 1.
195 The depth field is copied from the scope structure that holds this
196 decl. It is used to preserve the proper ordering of the ->shadowed
197 field (see bind()) and also for a handful of special-case checks.
198 Finally, the invisible bit is true for a decl which should be
199 ignored for purposes of normal name lookup, and the nested bit is
200 true for a decl that's been bound a second time in an inner scope;
201 in all such cases, the binding in the outer scope will have its
202 invisible bit true. */
204 struct c_binding GTY((chain_next ("%h.prev")))
206 tree decl; /* the decl bound */
207 tree type; /* the type in this scope */
208 tree id; /* the identifier it's bound to */
209 struct c_binding *prev; /* the previous decl in this scope */
210 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
211 unsigned int depth : 28; /* depth of this scope */
212 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
213 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
214 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
217 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
218 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
219 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
220 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
222 #define I_SYMBOL_BINDING(node) \
223 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
224 #define I_SYMBOL_DECL(node) \
225 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
227 #define I_TAG_BINDING(node) \
228 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
229 #define I_TAG_DECL(node) \
230 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
232 #define I_LABEL_BINDING(node) \
233 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
234 #define I_LABEL_DECL(node) \
235 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
237 /* Each C symbol points to three linked lists of c_binding structures.
238 These describe the values of the identifier in the three different
239 namespaces defined by the language. */
241 struct lang_identifier GTY(())
243 struct c_common_identifier common_id;
244 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
245 struct c_binding *tag_binding; /* struct/union/enum tags */
246 struct c_binding *label_binding; /* labels */
249 /* Validate c-lang.c's assumptions. */
250 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
251 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
253 /* The resulting tree type. */
256 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
257 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : (union lang_tree_node *) TREE_CHAIN (&%h.generic)")))
259 union tree_node GTY ((tag ("0"),
260 desc ("tree_node_structure (&%h)")))
262 struct lang_identifier GTY ((tag ("1"))) identifier;
265 /* Each c_scope structure describes the complete contents of one
266 scope. Four scopes are distinguished specially: the innermost or
267 current scope, the innermost function scope, the file scope (always
268 the second to outermost) and the outermost or external scope.
270 Most declarations are recorded in the current scope.
272 All normal label declarations are recorded in the innermost
273 function scope, as are bindings of undeclared identifiers to
274 error_mark_node. (GCC permits nested functions as an extension,
275 hence the 'innermost' qualifier.) Explicitly declared labels
276 (using the __label__ extension) appear in the current scope.
278 Being in the file scope (current_scope == file_scope) causes
279 special behavior in several places below. Also, under some
280 conditions the Objective-C front end records declarations in the
281 file scope even though that isn't the current scope.
283 All declarations with external linkage are recorded in the external
284 scope, even if they aren't visible there; this models the fact that
285 such declarations are visible to the entire program, and (with a
286 bit of cleverness, see pushdecl) allows diagnosis of some violations
287 of C99 6.2.2p7 and 6.2.7p2:
289 If, within the same translation unit, the same identifier appears
290 with both internal and external linkage, the behavior is
293 All declarations that refer to the same object or function shall
294 have compatible type; otherwise, the behavior is undefined.
296 Initially only the built-in declarations, which describe compiler
297 intrinsic functions plus a subset of the standard library, are in
300 The order of the blocks list matters, and it is frequently appended
301 to. To avoid having to walk all the way to the end of the list on
302 each insertion, or reverse the list later, we maintain a pointer to
303 the last list entry. (FIXME: It should be feasible to use a reversed
306 The bindings list is strictly in reverse order of declarations;
307 pop_scope relies on this. */
310 struct c_scope GTY((chain_next ("%h.outer")))
312 /* The scope containing this one. */
313 struct c_scope *outer;
315 /* The next outermost function scope. */
316 struct c_scope *outer_function;
318 /* All bindings in this scope. */
319 struct c_binding *bindings;
321 /* For each scope (except the global one), a chain of BLOCK nodes
322 for all the scopes that were entered and exited one level down. */
326 /* The depth of this scope. Used to keep the ->shadowed chain of
327 bindings sorted innermost to outermost. */
328 unsigned int depth : 28;
330 /* True if we are currently filling this scope with parameter
332 BOOL_BITFIELD parm_flag : 1;
334 /* True if we already complained about forward parameter decls
335 in this scope. This prevents double warnings on
336 foo (int a; int b; ...) */
337 BOOL_BITFIELD warned_forward_parm_decls : 1;
339 /* True if this is the outermost block scope of a function body.
340 This scope contains the parameters, the local variables declared
341 in the outermost block, and all the labels (except those in
342 nested functions, or declared at block scope with __label__). */
343 BOOL_BITFIELD function_body : 1;
345 /* True means make a BLOCK for this scope no matter what. */
346 BOOL_BITFIELD keep : 1;
349 /* The scope currently in effect. */
351 static GTY(()) struct c_scope *current_scope;
353 /* The innermost function scope. Ordinary (not explicitly declared)
354 labels, bindings to error_mark_node, and the lazily-created
355 bindings of __func__ and its friends get this scope. */
357 static GTY(()) struct c_scope *current_function_scope;
359 /* The C file scope. This is reset for each input translation unit. */
361 static GTY(()) struct c_scope *file_scope;
363 /* The outermost scope. This is used for all declarations with
364 external linkage, and only these, hence the name. */
366 static GTY(()) struct c_scope *external_scope;
368 /* A chain of c_scope structures awaiting reuse. */
370 static GTY((deletable)) struct c_scope *scope_freelist;
372 /* A chain of c_binding structures awaiting reuse. */
374 static GTY((deletable)) struct c_binding *binding_freelist;
376 /* Append VAR to LIST in scope SCOPE. */
377 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
378 struct c_scope *s_ = (scope); \
380 if (s_->list##_last) \
381 TREE_CHAIN (s_->list##_last) = d_; \
384 s_->list##_last = d_; \
387 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
388 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
389 struct c_scope *t_ = (tscope); \
390 struct c_scope *f_ = (fscope); \
392 TREE_CHAIN (t_->to##_last) = f_->from; \
395 t_->to##_last = f_->from##_last; \
398 /* True means unconditionally make a BLOCK for the next scope pushed. */
400 static bool keep_next_level_flag;
402 /* True means the next call to push_scope will be the outermost scope
403 of a function body, so do not push a new scope, merely cease
404 expecting parameter decls. */
406 static bool next_is_function_body;
408 /* Functions called automatically at the beginning and end of execution. */
410 static GTY(()) tree static_ctors;
411 static GTY(()) tree static_dtors;
413 /* Forward declarations. */
414 static tree lookup_name_in_scope (tree, struct c_scope *);
415 static tree c_make_fname_decl (tree, int);
416 static tree grokdeclarator (const struct c_declarator *,
417 struct c_declspecs *,
418 enum decl_context, bool, tree *);
419 static tree grokparms (struct c_arg_info *, bool);
420 static void layout_array_type (tree);
422 /* T is a statement. Add it to the statement-tree. This is the
423 C/ObjC version--C++ has a slightly different version of this
429 enum tree_code code = TREE_CODE (t);
431 if (EXPR_P (t) && code != LABEL_EXPR)
433 if (!EXPR_HAS_LOCATION (t))
434 SET_EXPR_LOCATION (t, input_location);
437 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
438 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
440 /* Add T to the statement-tree. Non-side-effect statements need to be
441 recorded during statement expressions. */
442 append_to_statement_list_force (t, &cur_stmt_list);
447 /* States indicating how grokdeclarator() should handle declspecs marked
448 with __attribute__((deprecated)). An object declared as
449 __attribute__((deprecated)) suppresses warnings of uses of other
452 enum deprecated_states {
457 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
460 c_print_identifier (FILE *file, tree node, int indent)
462 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
463 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
464 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
465 if (C_IS_RESERVED_WORD (node))
467 tree rid = ridpointers[C_RID_CODE (node)];
468 indent_to (file, indent + 4);
469 fprintf (file, "rid %p \"%s\"",
470 (void *) rid, IDENTIFIER_POINTER (rid));
474 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
475 which may be any of several kinds of DECL or TYPE or error_mark_node,
476 in the scope SCOPE. */
478 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
480 struct c_binding *b, **here;
482 if (binding_freelist)
484 b = binding_freelist;
485 binding_freelist = b->prev;
488 b = GGC_NEW (struct c_binding);
493 b->depth = scope->depth;
494 b->invisible = invisible;
500 b->prev = scope->bindings;
506 switch (TREE_CODE (decl))
508 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
511 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
517 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
523 /* Locate the appropriate place in the chain of shadowed decls
524 to insert this binding. Normally, scope == current_scope and
525 this does nothing. */
526 while (*here && (*here)->depth > scope->depth)
527 here = &(*here)->shadowed;
533 /* Clear the binding structure B, stick it on the binding_freelist,
534 and return the former value of b->prev. This is used by pop_scope
535 and get_parm_info to iterate destructively over all the bindings
536 from a given scope. */
537 static struct c_binding *
538 free_binding_and_advance (struct c_binding *b)
540 struct c_binding *prev = b->prev;
542 memset (b, 0, sizeof (struct c_binding));
543 b->prev = binding_freelist;
544 binding_freelist = b;
550 /* Hook called at end of compilation to assume 1 elt
551 for a file-scope tentative array defn that wasn't complete before. */
554 c_finish_incomplete_decl (tree decl)
556 if (TREE_CODE (decl) == VAR_DECL)
558 tree type = TREE_TYPE (decl);
559 if (type != error_mark_node
560 && TREE_CODE (type) == ARRAY_TYPE
561 && !DECL_EXTERNAL (decl)
562 && TYPE_DOMAIN (type) == 0)
564 warning (0, "array %q+D assumed to have one element", decl);
566 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
568 layout_decl (decl, 0);
573 /* The Objective-C front-end often needs to determine the current scope. */
576 objc_get_current_scope (void)
578 return current_scope;
581 /* The following function is used only by Objective-C. It needs to live here
582 because it accesses the innards of c_scope. */
585 objc_mark_locals_volatile (void *enclosing_blk)
587 struct c_scope *scope;
590 for (scope = current_scope;
591 scope && scope != enclosing_blk;
592 scope = scope->outer)
594 for (b = scope->bindings; b; b = b->prev)
595 objc_volatilize_decl (b->decl);
597 /* Do not climb up past the current function. */
598 if (scope->function_body)
603 /* Nonzero if we are currently in file scope. */
606 global_bindings_p (void)
608 return current_scope == file_scope && !c_override_global_bindings_to_false;
612 keep_next_level (void)
614 keep_next_level_flag = true;
617 /* Identify this scope as currently being filled with parameters. */
620 declare_parm_level (void)
622 current_scope->parm_flag = true;
628 if (next_is_function_body)
630 /* This is the transition from the parameters to the top level
631 of the function body. These are the same scope
632 (C99 6.2.1p4,6) so we do not push another scope structure.
633 next_is_function_body is set only by store_parm_decls, which
634 in turn is called when and only when we are about to
635 encounter the opening curly brace for the function body.
637 The outermost block of a function always gets a BLOCK node,
638 because the debugging output routines expect that each
639 function has at least one BLOCK. */
640 current_scope->parm_flag = false;
641 current_scope->function_body = true;
642 current_scope->keep = true;
643 current_scope->outer_function = current_function_scope;
644 current_function_scope = current_scope;
646 keep_next_level_flag = false;
647 next_is_function_body = false;
651 struct c_scope *scope;
654 scope = scope_freelist;
655 scope_freelist = scope->outer;
658 scope = GGC_CNEW (struct c_scope);
660 scope->keep = keep_next_level_flag;
661 scope->outer = current_scope;
662 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
664 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
666 if (current_scope && scope->depth == 0)
669 sorry ("GCC supports only %u nested scopes", scope->depth);
672 current_scope = scope;
673 keep_next_level_flag = false;
677 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
680 set_type_context (tree type, tree context)
682 for (type = TYPE_MAIN_VARIANT (type); type;
683 type = TYPE_NEXT_VARIANT (type))
684 TYPE_CONTEXT (type) = context;
687 /* Exit a scope. Restore the state of the identifier-decl mappings
688 that were in effect when this scope was entered. Return a BLOCK
689 node containing all the DECLs in this scope that are of interest
690 to debug info generation. */
695 struct c_scope *scope = current_scope;
696 tree block, context, p;
699 bool functionbody = scope->function_body;
700 bool keep = functionbody || scope->keep || scope->bindings;
702 c_end_vm_scope (scope->depth);
704 /* If appropriate, create a BLOCK to record the decls for the life
709 block = make_node (BLOCK);
710 BLOCK_SUBBLOCKS (block) = scope->blocks;
711 TREE_USED (block) = 1;
713 /* In each subblock, record that this is its superior. */
714 for (p = scope->blocks; p; p = TREE_CHAIN (p))
715 BLOCK_SUPERCONTEXT (p) = block;
717 BLOCK_VARS (block) = 0;
720 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
721 scope must be set so that they point to the appropriate
722 construct, i.e. either to the current FUNCTION_DECL node, or
723 else to the BLOCK node we just constructed.
725 Note that for tagged types whose scope is just the formal
726 parameter list for some function type specification, we can't
727 properly set their TYPE_CONTEXTs here, because we don't have a
728 pointer to the appropriate FUNCTION_TYPE node readily available
729 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
730 type nodes get set in `grokdeclarator' as soon as we have created
731 the FUNCTION_TYPE node which will represent the "scope" for these
732 "parameter list local" tagged types. */
733 if (scope->function_body)
734 context = current_function_decl;
735 else if (scope == file_scope)
737 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
738 TREE_CHAIN (file_decl) = all_translation_units;
739 all_translation_units = file_decl;
745 /* Clear all bindings in this scope. */
746 for (b = scope->bindings; b; b = free_binding_and_advance (b))
749 switch (TREE_CODE (p))
752 /* Warnings for unused labels, errors for undefined labels. */
753 if (TREE_USED (p) && !DECL_INITIAL (p))
755 error ("label %q+D used but not defined", p);
756 DECL_INITIAL (p) = error_mark_node;
758 else if (!TREE_USED (p) && warn_unused_label)
760 if (DECL_INITIAL (p))
761 warning (0, "label %q+D defined but not used", p);
763 warning (0, "label %q+D declared but not defined", p);
765 /* Labels go in BLOCK_VARS. */
766 TREE_CHAIN (p) = BLOCK_VARS (block);
767 BLOCK_VARS (block) = p;
768 gcc_assert (I_LABEL_BINDING (b->id) == b);
769 I_LABEL_BINDING (b->id) = b->shadowed;
775 set_type_context (p, context);
777 /* Types may not have tag-names, in which case the type
778 appears in the bindings list with b->id NULL. */
781 gcc_assert (I_TAG_BINDING (b->id) == b);
782 I_TAG_BINDING (b->id) = b->shadowed;
787 /* Propagate TREE_ADDRESSABLE from nested functions to their
788 containing functions. */
789 if (!TREE_ASM_WRITTEN (p)
790 && DECL_INITIAL (p) != 0
791 && TREE_ADDRESSABLE (p)
792 && DECL_ABSTRACT_ORIGIN (p) != 0
793 && DECL_ABSTRACT_ORIGIN (p) != p)
794 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
795 if (!DECL_EXTERNAL (p)
796 && DECL_INITIAL (p) == 0)
798 error ("nested function %q+D declared but never defined", p);
799 undef_nested_function = true;
804 /* Warnings for unused variables. */
806 && !TREE_NO_WARNING (p)
807 && !DECL_IN_SYSTEM_HEADER (p)
809 && !DECL_ARTIFICIAL (p)
810 && scope != file_scope
811 && scope != external_scope)
812 warning (OPT_Wunused_variable, "unused variable %q+D", p);
816 error ("type of array %q+D completed incompatibly with"
817 " implicit initialization", p);
824 /* All of these go in BLOCK_VARS, but only if this is the
825 binding in the home scope. */
828 TREE_CHAIN (p) = BLOCK_VARS (block);
829 BLOCK_VARS (block) = p;
831 /* If this is the file scope, and we are processing more
832 than one translation unit in this compilation, set
833 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
834 This makes same_translation_unit_p work, and causes
835 static declarations to be given disambiguating suffixes. */
836 if (scope == file_scope && num_in_fnames > 1)
838 DECL_CONTEXT (p) = context;
839 if (TREE_CODE (p) == TYPE_DECL)
840 set_type_context (TREE_TYPE (p), context);
844 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
845 already been put there by store_parm_decls. Unused-
846 parameter warnings are handled by function.c.
847 error_mark_node obviously does not go in BLOCK_VARS and
848 does not get unused-variable warnings. */
851 /* It is possible for a decl not to have a name. We get
852 here with b->id NULL in this case. */
855 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
856 I_SYMBOL_BINDING (b->id) = b->shadowed;
857 if (b->shadowed && b->shadowed->type)
858 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
868 /* Dispose of the block that we just made inside some higher level. */
869 if ((scope->function_body || scope == file_scope) && context)
871 DECL_INITIAL (context) = block;
872 BLOCK_SUPERCONTEXT (block) = context;
874 else if (scope->outer)
877 SCOPE_LIST_APPEND (scope->outer, blocks, block);
878 /* If we did not make a block for the scope just exited, any
879 blocks made for inner scopes must be carried forward so they
880 will later become subblocks of something else. */
881 else if (scope->blocks)
882 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
885 /* Pop the current scope, and free the structure for reuse. */
886 current_scope = scope->outer;
887 if (scope->function_body)
888 current_function_scope = scope->outer_function;
890 memset (scope, 0, sizeof (struct c_scope));
891 scope->outer = scope_freelist;
892 scope_freelist = scope;
898 push_file_scope (void)
906 file_scope = current_scope;
908 start_fname_decls ();
910 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
911 bind (DECL_NAME (decl), decl, file_scope,
912 /*invisible=*/false, /*nested=*/true);
916 pop_file_scope (void)
918 /* In case there were missing closebraces, get us back to the global
920 while (current_scope != file_scope)
923 /* __FUNCTION__ is defined at file scope (""). This
924 call may not be necessary as my tests indicate it
925 still works without it. */
926 finish_fname_decls ();
928 /* This is the point to write out a PCH if we're doing that.
929 In that case we do not want to do anything else. */
932 c_common_write_pch ();
936 /* Pop off the file scope and close this translation unit. */
940 maybe_apply_pending_pragma_weaks ();
941 cgraph_finalize_compilation_unit ();
944 /* Insert BLOCK at the end of the list of subblocks of the current
945 scope. This is used when a BIND_EXPR is expanded, to handle the
946 BLOCK node inside the BIND_EXPR. */
949 insert_block (tree block)
951 TREE_USED (block) = 1;
952 SCOPE_LIST_APPEND (current_scope, blocks, block);
955 /* Push a definition or a declaration of struct, union or enum tag "name".
956 "type" should be the type node.
957 We assume that the tag "name" is not already defined.
959 Note that the definition may really be just a forward reference.
960 In that case, the TYPE_SIZE will be zero. */
963 pushtag (tree name, tree type)
965 /* Record the identifier as the type's name if it has none. */
966 if (name && !TYPE_NAME (type))
967 TYPE_NAME (type) = name;
968 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
970 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
971 tagged type we just added to the current scope. This fake
972 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
973 to output a representation of a tagged type, and it also gives
974 us a convenient place to record the "scope start" address for the
977 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
979 /* An approximation for now, so we can tell this is a function-scope tag.
980 This will be updated in pop_scope. */
981 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
984 /* Subroutine of compare_decls. Allow harmless mismatches in return
985 and argument types provided that the type modes match. This function
986 return a unified type given a suitable match, and 0 otherwise. */
989 match_builtin_function_types (tree newtype, tree oldtype)
991 tree newrettype, oldrettype;
992 tree newargs, oldargs;
993 tree trytype, tryargs;
995 /* Accept the return type of the new declaration if same modes. */
996 oldrettype = TREE_TYPE (oldtype);
997 newrettype = TREE_TYPE (newtype);
999 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1002 oldargs = TYPE_ARG_TYPES (oldtype);
1003 newargs = TYPE_ARG_TYPES (newtype);
1006 while (oldargs || newargs)
1010 || !TREE_VALUE (oldargs)
1011 || !TREE_VALUE (newargs)
1012 || TYPE_MODE (TREE_VALUE (oldargs))
1013 != TYPE_MODE (TREE_VALUE (newargs)))
1016 oldargs = TREE_CHAIN (oldargs);
1017 newargs = TREE_CHAIN (newargs);
1020 trytype = build_function_type (newrettype, tryargs);
1021 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1024 /* Subroutine of diagnose_mismatched_decls. Check for function type
1025 mismatch involving an empty arglist vs a nonempty one and give clearer
1028 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1029 tree newtype, tree oldtype)
1033 if (TREE_CODE (olddecl) != FUNCTION_DECL
1034 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1035 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1037 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1040 t = TYPE_ARG_TYPES (oldtype);
1042 t = TYPE_ARG_TYPES (newtype);
1043 for (; t; t = TREE_CHAIN (t))
1045 tree type = TREE_VALUE (t);
1047 if (TREE_CHAIN (t) == 0
1048 && TYPE_MAIN_VARIANT (type) != void_type_node)
1050 inform ("a parameter list with an ellipsis can%'t match "
1051 "an empty parameter name list declaration");
1055 if (c_type_promotes_to (type) != type)
1057 inform ("an argument type that has a default promotion can%'t match "
1058 "an empty parameter name list declaration");
1064 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1065 old-style function definition, NEWDECL is a prototype declaration.
1066 Diagnose inconsistencies in the argument list. Returns TRUE if
1067 the prototype is compatible, FALSE if not. */
1069 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1071 tree newargs, oldargs;
1074 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1076 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1077 newargs = TYPE_ARG_TYPES (newtype);
1082 tree oldargtype = TYPE_MAIN_VARIANT (TREE_VALUE (oldargs));
1083 tree newargtype = TYPE_MAIN_VARIANT (TREE_VALUE (newargs));
1085 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1088 /* Reaching the end of just one list means the two decls don't
1089 agree on the number of arguments. */
1090 if (END_OF_ARGLIST (oldargtype))
1092 error ("prototype for %q+D declares more arguments "
1093 "than previous old-style definition", newdecl);
1096 else if (END_OF_ARGLIST (newargtype))
1098 error ("prototype for %q+D declares fewer arguments "
1099 "than previous old-style definition", newdecl);
1103 /* Type for passing arg must be consistent with that declared
1105 else if (!comptypes (oldargtype, newargtype))
1107 error ("prototype for %q+D declares argument %d"
1108 " with incompatible type",
1113 oldargs = TREE_CHAIN (oldargs);
1114 newargs = TREE_CHAIN (newargs);
1118 /* If we get here, no errors were found, but do issue a warning
1119 for this poor-style construct. */
1120 warning (0, "prototype for %q+D follows non-prototype definition",
1123 #undef END_OF_ARGLIST
1126 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1127 first in a pair of mismatched declarations, using the diagnostic
1130 locate_old_decl (tree decl, void (*diag)(const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2))
1132 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1134 else if (DECL_INITIAL (decl))
1135 diag (G_("previous definition of %q+D was here"), decl);
1136 else if (C_DECL_IMPLICIT (decl))
1137 diag (G_("previous implicit declaration of %q+D was here"), decl);
1139 diag (G_("previous declaration of %q+D was here"), decl);
1142 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1143 Returns true if the caller should proceed to merge the two, false
1144 if OLDDECL should simply be discarded. As a side effect, issues
1145 all necessary diagnostics for invalid or poor-style combinations.
1146 If it returns true, writes the types of NEWDECL and OLDDECL to
1147 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1148 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1151 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1152 tree *newtypep, tree *oldtypep)
1154 tree newtype, oldtype;
1155 bool pedwarned = false;
1156 bool warned = false;
1159 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1160 && DECL_EXTERNAL (DECL))
1162 /* If we have error_mark_node for either decl or type, just discard
1163 the previous decl - we're in an error cascade already. */
1164 if (olddecl == error_mark_node || newdecl == error_mark_node)
1166 *oldtypep = oldtype = TREE_TYPE (olddecl);
1167 *newtypep = newtype = TREE_TYPE (newdecl);
1168 if (oldtype == error_mark_node || newtype == error_mark_node)
1171 /* Two different categories of symbol altogether. This is an error
1172 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1173 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1175 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1176 && DECL_BUILT_IN (olddecl)
1177 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1179 error ("%q+D redeclared as different kind of symbol", newdecl);
1180 locate_old_decl (olddecl, error);
1182 else if (TREE_PUBLIC (newdecl))
1183 warning (0, "built-in function %q+D declared as non-function",
1186 warning (OPT_Wshadow, "declaration of %q+D shadows "
1187 "a built-in function", newdecl);
1191 /* Enumerators have no linkage, so may only be declared once in a
1193 if (TREE_CODE (olddecl) == CONST_DECL)
1195 error ("redeclaration of enumerator %q+D", newdecl);
1196 locate_old_decl (olddecl, error);
1200 if (!comptypes (oldtype, newtype))
1202 if (TREE_CODE (olddecl) == FUNCTION_DECL
1203 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1205 /* Accept harmless mismatch in function types.
1206 This is for the ffs and fprintf builtins. */
1207 tree trytype = match_builtin_function_types (newtype, oldtype);
1209 if (trytype && comptypes (newtype, trytype))
1210 *oldtypep = oldtype = trytype;
1213 /* If types don't match for a built-in, throw away the
1214 built-in. No point in calling locate_old_decl here, it
1215 won't print anything. */
1216 warning (0, "conflicting types for built-in function %q+D",
1221 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1222 && DECL_IS_BUILTIN (olddecl))
1224 /* A conflicting function declaration for a predeclared
1225 function that isn't actually built in. Objective C uses
1226 these. The new declaration silently overrides everything
1227 but the volatility (i.e. noreturn) indication. See also
1228 below. FIXME: Make Objective C use normal builtins. */
1229 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1232 /* Permit void foo (...) to match int foo (...) if the latter is
1233 the definition and implicit int was used. See
1234 c-torture/compile/920625-2.c. */
1235 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1236 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1237 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1238 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1240 pedwarn ("conflicting types for %q+D", newdecl);
1241 /* Make sure we keep void as the return type. */
1242 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1243 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1246 /* Permit void foo (...) to match an earlier call to foo (...) with
1247 no declared type (thus, implicitly int). */
1248 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1249 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1250 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1251 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1253 pedwarn ("conflicting types for %q+D", newdecl);
1254 /* Make sure we keep void as the return type. */
1255 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1260 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1261 error ("conflicting type qualifiers for %q+D", newdecl);
1263 error ("conflicting types for %q+D", newdecl);
1264 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1265 locate_old_decl (olddecl, error);
1270 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1271 but silently ignore the redeclaration if either is in a system
1272 header. (Conflicting redeclarations were handled above.) */
1273 if (TREE_CODE (newdecl) == TYPE_DECL)
1275 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1276 return true; /* Allow OLDDECL to continue in use. */
1278 error ("redefinition of typedef %q+D", newdecl);
1279 locate_old_decl (olddecl, error);
1283 /* Function declarations can either be 'static' or 'extern' (no
1284 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1285 can never conflict with each other on account of linkage (6.2.2p4).
1286 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1287 two definitions if one is 'extern inline' and one is not. The non-
1288 extern-inline definition supersedes the extern-inline definition. */
1290 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1292 /* If you declare a built-in function name as static, or
1293 define the built-in with an old-style definition (so we
1294 can't validate the argument list) the built-in definition is
1295 overridden, but optionally warn this was a bad choice of name. */
1296 if (DECL_BUILT_IN (olddecl)
1297 && !C_DECL_DECLARED_BUILTIN (olddecl)
1298 && (!TREE_PUBLIC (newdecl)
1299 || (DECL_INITIAL (newdecl)
1300 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1302 warning (OPT_Wshadow, "declaration of %q+D shadows "
1303 "a built-in function", newdecl);
1304 /* Discard the old built-in function. */
1308 if (DECL_INITIAL (newdecl))
1310 if (DECL_INITIAL (olddecl))
1312 /* If both decls are in the same TU and the new declaration
1313 isn't overriding an extern inline reject the new decl.
1314 When we handle c99 style inline rules we'll want to reject
1317 DECL_EXTERN_INLINE (olddecl)
1318 && !DECL_EXTERN_INLINE (newdecl)
1320 if they're in the same translation unit. Until we implement
1321 the full semantics we accept the construct. */
1322 if (!(DECL_EXTERN_INLINE (olddecl)
1323 && !DECL_EXTERN_INLINE (newdecl))
1324 && same_translation_unit_p (newdecl, olddecl))
1326 error ("redefinition of %q+D", newdecl);
1327 locate_old_decl (olddecl, error);
1332 /* If we have a prototype after an old-style function definition,
1333 the argument types must be checked specially. */
1334 else if (DECL_INITIAL (olddecl)
1335 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1336 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1337 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1339 locate_old_decl (olddecl, error);
1342 /* A non-static declaration (even an "extern") followed by a
1343 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1344 The same is true for a static forward declaration at block
1345 scope followed by a non-static declaration/definition at file
1346 scope. Static followed by non-static at the same scope is
1347 not undefined behavior, and is the most convenient way to get
1348 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1349 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1350 we do diagnose it if -Wtraditional. */
1351 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1353 /* Two exceptions to the rule. If olddecl is an extern
1354 inline, or a predeclared function that isn't actually
1355 built in, newdecl silently overrides olddecl. The latter
1356 occur only in Objective C; see also above. (FIXME: Make
1357 Objective C use normal builtins.) */
1358 if (!DECL_IS_BUILTIN (olddecl)
1359 && !DECL_EXTERN_INLINE (olddecl))
1361 error ("static declaration of %q+D follows "
1362 "non-static declaration", newdecl);
1363 locate_old_decl (olddecl, error);
1367 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1369 if (DECL_CONTEXT (olddecl))
1371 error ("non-static declaration of %q+D follows "
1372 "static declaration", newdecl);
1373 locate_old_decl (olddecl, error);
1376 else if (warn_traditional)
1378 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1379 "follows static declaration", newdecl);
1384 else if (TREE_CODE (newdecl) == VAR_DECL)
1386 /* Only variables can be thread-local, and all declarations must
1387 agree on this property. */
1388 if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1390 if (DECL_THREAD_LOCAL_P (newdecl))
1391 error ("thread-local declaration of %q+D follows "
1392 "non-thread-local declaration", newdecl);
1394 error ("non-thread-local declaration of %q+D follows "
1395 "thread-local declaration", newdecl);
1397 locate_old_decl (olddecl, error);
1401 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1402 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1404 error ("redefinition of %q+D", newdecl);
1405 locate_old_decl (olddecl, error);
1409 /* Objects declared at file scope: if the first declaration had
1410 external linkage (even if it was an external reference) the
1411 second must have external linkage as well, or the behavior is
1412 undefined. If the first declaration had internal linkage, then
1413 the second must too, or else be an external reference (in which
1414 case the composite declaration still has internal linkage).
1415 As for function declarations, we warn about the static-then-
1416 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1417 if (DECL_FILE_SCOPE_P (newdecl)
1418 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1420 if (DECL_EXTERNAL (newdecl))
1422 if (!DECL_FILE_SCOPE_P (olddecl))
1424 error ("extern declaration of %q+D follows "
1425 "declaration with no linkage", newdecl);
1426 locate_old_decl (olddecl, error);
1429 else if (warn_traditional)
1431 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1432 "follows static declaration", newdecl);
1438 if (TREE_PUBLIC (newdecl))
1439 error ("non-static declaration of %q+D follows "
1440 "static declaration", newdecl);
1442 error ("static declaration of %q+D follows "
1443 "non-static declaration", newdecl);
1445 locate_old_decl (olddecl, error);
1449 /* Two objects with the same name declared at the same block
1450 scope must both be external references (6.7p3). */
1451 else if (!DECL_FILE_SCOPE_P (newdecl))
1453 if (DECL_EXTERNAL (newdecl))
1455 /* Extern with initializer at block scope, which will
1456 already have received an error. */
1458 else if (DECL_EXTERNAL (olddecl))
1460 error ("declaration of %q+D with no linkage follows "
1461 "extern declaration", newdecl);
1462 locate_old_decl (olddecl, error);
1466 error ("redeclaration of %q+D with no linkage", newdecl);
1467 locate_old_decl (olddecl, error);
1475 /* All decls must agree on a visibility. */
1476 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
1477 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1478 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1480 warning (0, "redeclaration of %q+D with different visibility "
1481 "(old visibility preserved)", newdecl);
1485 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1487 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1488 if (DECL_DECLARED_INLINE_P (newdecl)
1489 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1491 warning (OPT_Wattributes, "inline declaration of %qD follows "
1492 "declaration with attribute noinline", newdecl);
1495 else if (DECL_DECLARED_INLINE_P (olddecl)
1496 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1498 warning (OPT_Wattributes, "declaration of %q+D with attribute "
1499 "noinline follows inline declaration ", newdecl);
1503 /* Inline declaration after use or definition.
1504 ??? Should we still warn about this now we have unit-at-a-time
1505 mode and can get it right?
1506 Definitely don't complain if the decls are in different translation
1508 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1509 && same_translation_unit_p (olddecl, newdecl))
1511 if (TREE_USED (olddecl))
1513 warning (0, "%q+D declared inline after being called", olddecl);
1516 else if (DECL_INITIAL (olddecl))
1518 warning (0, "%q+D declared inline after its definition", olddecl);
1523 else /* PARM_DECL, VAR_DECL */
1525 /* Redeclaration of a parameter is a constraint violation (this is
1526 not explicitly stated, but follows from C99 6.7p3 [no more than
1527 one declaration of the same identifier with no linkage in the
1528 same scope, except type tags] and 6.2.2p6 [parameters have no
1529 linkage]). We must check for a forward parameter declaration,
1530 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1531 an extension, the mandatory diagnostic for which is handled by
1532 mark_forward_parm_decls. */
1534 if (TREE_CODE (newdecl) == PARM_DECL
1535 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1537 error ("redefinition of parameter %q+D", newdecl);
1538 locate_old_decl (olddecl, error);
1543 /* Optional warning for completely redundant decls. */
1544 if (!warned && !pedwarned
1545 && warn_redundant_decls
1546 /* Don't warn about a function declaration followed by a
1548 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1549 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1550 /* Don't warn about redundant redeclarations of builtins. */
1551 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1552 && !DECL_BUILT_IN (newdecl)
1553 && DECL_BUILT_IN (olddecl)
1554 && !C_DECL_DECLARED_BUILTIN (olddecl))
1555 /* Don't warn about an extern followed by a definition. */
1556 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1557 /* Don't warn about forward parameter decls. */
1558 && !(TREE_CODE (newdecl) == PARM_DECL
1559 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1560 /* Don't warn about a variable definition following a declaration. */
1561 && !(TREE_CODE (newdecl) == VAR_DECL
1562 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
1564 warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
1569 /* Report location of previous decl/defn in a consistent manner. */
1570 if (warned || pedwarned)
1571 locate_old_decl (olddecl, pedwarned ? pedwarn : warning0);
1573 #undef DECL_EXTERN_INLINE
1578 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1579 consistent with OLDDECL, but carries new information. Merge the
1580 new information into OLDDECL. This function issues no
1584 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1586 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1587 && DECL_INITIAL (newdecl) != 0);
1588 int new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
1589 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
1590 int old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
1591 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
1593 /* For real parm decl following a forward decl, rechain the old decl
1594 in its new location and clear TREE_ASM_WRITTEN (it's not a
1595 forward decl anymore). */
1596 if (TREE_CODE (newdecl) == PARM_DECL
1597 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1599 struct c_binding *b, **here;
1601 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1602 if ((*here)->decl == olddecl)
1609 b->prev = current_scope->bindings;
1610 current_scope->bindings = b;
1612 TREE_ASM_WRITTEN (olddecl) = 0;
1615 DECL_ATTRIBUTES (newdecl)
1616 = targetm.merge_decl_attributes (olddecl, newdecl);
1618 /* Merge the data types specified in the two decls. */
1620 = TREE_TYPE (olddecl)
1621 = composite_type (newtype, oldtype);
1623 /* Lay the type out, unless already done. */
1624 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1626 if (TREE_TYPE (newdecl) != error_mark_node)
1627 layout_type (TREE_TYPE (newdecl));
1628 if (TREE_CODE (newdecl) != FUNCTION_DECL
1629 && TREE_CODE (newdecl) != TYPE_DECL
1630 && TREE_CODE (newdecl) != CONST_DECL)
1631 layout_decl (newdecl, 0);
1635 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1636 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1637 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1638 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1639 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1640 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1642 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1643 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1648 /* Merge the type qualifiers. */
1649 if (TREE_READONLY (newdecl))
1650 TREE_READONLY (olddecl) = 1;
1652 if (TREE_THIS_VOLATILE (newdecl))
1654 TREE_THIS_VOLATILE (olddecl) = 1;
1655 if (TREE_CODE (newdecl) == VAR_DECL)
1656 make_var_volatile (newdecl);
1659 /* Merge deprecatedness. */
1660 if (TREE_DEPRECATED (newdecl))
1661 TREE_DEPRECATED (olddecl) = 1;
1663 /* Keep source location of definition rather than declaration and of
1664 prototype rather than non-prototype unless that prototype is
1666 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1667 || (old_is_prototype && !new_is_prototype
1668 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1669 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1671 /* Merge the initialization information. */
1672 if (DECL_INITIAL (newdecl) == 0)
1673 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1675 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1677 /* Merge the unused-warning information. */
1678 if (DECL_IN_SYSTEM_HEADER (olddecl))
1679 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1680 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1681 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1683 /* Merge the section attribute.
1684 We want to issue an error if the sections conflict but that must be
1685 done later in decl_attributes since we are called before attributes
1687 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1688 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1690 /* Copy the assembler name.
1691 Currently, it can only be defined in the prototype. */
1692 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1694 /* Use visibility of whichever declaration had it specified */
1695 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1697 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1698 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1701 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1703 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1704 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1705 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1706 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1707 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1708 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1709 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1710 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1711 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1712 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1715 /* Merge the storage class information. */
1716 merge_weak (newdecl, olddecl);
1718 /* For functions, static overrides non-static. */
1719 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1721 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1722 /* This is since we don't automatically
1723 copy the attributes of NEWDECL into OLDDECL. */
1724 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1725 /* If this clears `static', clear it in the identifier too. */
1726 if (!TREE_PUBLIC (olddecl))
1727 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1731 if (DECL_EXTERNAL (newdecl))
1733 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1734 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1736 /* An extern decl does not override previous storage class. */
1737 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1738 if (!DECL_EXTERNAL (newdecl))
1740 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1741 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1746 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1747 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1750 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1752 /* If we're redefining a function previously defined as extern
1753 inline, make sure we emit debug info for the inline before we
1754 throw it away, in case it was inlined into a function that hasn't
1755 been written out yet. */
1756 if (new_is_definition && DECL_INITIAL (olddecl))
1758 if (TREE_USED (olddecl)
1759 /* In unit-at-a-time mode we never inline re-defined extern
1760 inline functions. */
1761 && !flag_unit_at_a_time
1762 && cgraph_function_possibly_inlined_p (olddecl))
1763 (*debug_hooks->outlining_inline_function) (olddecl);
1765 /* The new defn must not be inline. */
1766 DECL_INLINE (newdecl) = 0;
1767 DECL_UNINLINABLE (newdecl) = 1;
1771 /* If either decl says `inline', this fn is inline,
1772 unless its definition was passed already. */
1773 if (DECL_DECLARED_INLINE_P (newdecl)
1774 || DECL_DECLARED_INLINE_P (olddecl))
1775 DECL_DECLARED_INLINE_P (newdecl) = 1;
1777 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1778 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1781 if (DECL_BUILT_IN (olddecl))
1783 /* If redeclaring a builtin function, it stays built in.
1784 But it gets tagged as having been declared. */
1785 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1786 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1787 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1788 if (new_is_prototype)
1789 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1791 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1792 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1795 /* Also preserve various other info from the definition. */
1796 if (!new_is_definition)
1798 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1799 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1800 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1801 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1802 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1804 /* Set DECL_INLINE on the declaration if we've got a body
1805 from which to instantiate. */
1806 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1808 DECL_INLINE (newdecl) = 1;
1809 DECL_ABSTRACT_ORIGIN (newdecl)
1810 = DECL_ABSTRACT_ORIGIN (olddecl);
1815 /* If a previous declaration said inline, mark the
1816 definition as inlinable. */
1817 if (DECL_DECLARED_INLINE_P (newdecl)
1818 && !DECL_UNINLINABLE (newdecl))
1819 DECL_INLINE (newdecl) = 1;
1823 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1824 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1826 unsigned olddecl_uid = DECL_UID (olddecl);
1827 tree olddecl_context = DECL_CONTEXT (olddecl);
1829 memcpy ((char *) olddecl + sizeof (struct tree_common),
1830 (char *) newdecl + sizeof (struct tree_common),
1831 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1832 switch (TREE_CODE (olddecl))
1842 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1843 (char *) newdecl + sizeof (struct tree_decl_common),
1844 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1849 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1850 (char *) newdecl + sizeof (struct tree_decl_common),
1851 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1853 DECL_UID (olddecl) = olddecl_uid;
1854 DECL_CONTEXT (olddecl) = olddecl_context;
1857 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1858 so that encode_section_info has a chance to look at the new decl
1859 flags and attributes. */
1860 if (DECL_RTL_SET_P (olddecl)
1861 && (TREE_CODE (olddecl) == FUNCTION_DECL
1862 || (TREE_CODE (olddecl) == VAR_DECL
1863 && TREE_STATIC (olddecl))))
1864 make_decl_rtl (olddecl);
1867 /* Handle when a new declaration NEWDECL has the same name as an old
1868 one OLDDECL in the same binding contour. Prints an error message
1871 If safely possible, alter OLDDECL to look like NEWDECL, and return
1872 true. Otherwise, return false. */
1875 duplicate_decls (tree newdecl, tree olddecl)
1877 tree newtype = NULL, oldtype = NULL;
1879 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1881 /* Avoid `unused variable' and other warnings warnings for OLDDECL. */
1882 TREE_NO_WARNING (olddecl) = 1;
1886 merge_decls (newdecl, olddecl, newtype, oldtype);
1891 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1893 warn_if_shadowing (tree new_decl)
1895 struct c_binding *b;
1897 /* Shadow warnings wanted? */
1899 /* No shadow warnings for internally generated vars. */
1900 || DECL_IS_BUILTIN (new_decl)
1901 /* No shadow warnings for vars made for inlining. */
1902 || DECL_FROM_INLINE (new_decl))
1905 /* Is anything being shadowed? Invisible decls do not count. */
1906 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1907 if (b->decl && b->decl != new_decl && !b->invisible)
1909 tree old_decl = b->decl;
1911 if (old_decl == error_mark_node)
1913 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1914 "non-variable", new_decl);
1917 else if (TREE_CODE (old_decl) == PARM_DECL)
1918 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
1920 else if (DECL_FILE_SCOPE_P (old_decl))
1921 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
1922 "declaration", new_decl);
1923 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1924 && DECL_BUILT_IN (old_decl))
1926 warning (OPT_Wshadow, "declaration of %q+D shadows "
1927 "a built-in function", new_decl);
1931 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
1934 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
1941 /* Subroutine of pushdecl.
1943 X is a TYPE_DECL for a typedef statement. Create a brand new
1944 ..._TYPE node (which will be just a variant of the existing
1945 ..._TYPE node with identical properties) and then install X
1946 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1948 The whole point here is to end up with a situation where each
1949 and every ..._TYPE node the compiler creates will be uniquely
1950 associated with AT MOST one node representing a typedef name.
1951 This way, even though the compiler substitutes corresponding
1952 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1953 early on, later parts of the compiler can always do the reverse
1954 translation and get back the corresponding typedef name. For
1957 typedef struct S MY_TYPE;
1960 Later parts of the compiler might only know that `object' was of
1961 type `struct S' if it were not for code just below. With this
1962 code however, later parts of the compiler see something like:
1964 struct S' == struct S
1965 typedef struct S' MY_TYPE;
1968 And they can then deduce (from the node for type struct S') that
1969 the original object declaration was:
1973 Being able to do this is important for proper support of protoize,
1974 and also for generating precise symbolic debugging information
1975 which takes full account of the programmer's (typedef) vocabulary.
1977 Obviously, we don't want to generate a duplicate ..._TYPE node if
1978 the TYPE_DECL node that we are now processing really represents a
1979 standard built-in type.
1981 Since all standard types are effectively declared at line zero
1982 in the source file, we can easily check to see if we are working
1983 on a standard type by checking the current value of lineno. */
1986 clone_underlying_type (tree x)
1988 if (DECL_IS_BUILTIN (x))
1990 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1991 TYPE_NAME (TREE_TYPE (x)) = x;
1993 else if (TREE_TYPE (x) != error_mark_node
1994 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1996 tree tt = TREE_TYPE (x);
1997 DECL_ORIGINAL_TYPE (x) = tt;
1998 tt = build_variant_type_copy (tt);
2000 TREE_USED (tt) = TREE_USED (x);
2005 /* Record a decl-node X as belonging to the current lexical scope.
2006 Check for errors (such as an incompatible declaration for the same
2007 name already seen in the same scope).
2009 Returns either X or an old decl for the same name.
2010 If an old decl is returned, it may have been smashed
2011 to agree with what X says. */
2016 tree name = DECL_NAME (x);
2017 struct c_scope *scope = current_scope;
2018 struct c_binding *b;
2019 bool nested = false;
2021 /* Functions need the lang_decl data. */
2022 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
2023 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
2025 /* Must set DECL_CONTEXT for everything not at file scope or
2026 DECL_FILE_SCOPE_P won't work. Local externs don't count
2027 unless they have initializers (which generate code). */
2028 if (current_function_decl
2029 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2030 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2031 DECL_CONTEXT (x) = current_function_decl;
2033 /* If this is of variably modified type, prevent jumping into its
2035 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2036 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2037 c_begin_vm_scope (scope->depth);
2039 /* Anonymous decls are just inserted in the scope. */
2042 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
2046 /* First, see if there is another declaration with the same name in
2047 the current scope. If there is, duplicate_decls may do all the
2048 work for us. If duplicate_decls returns false, that indicates
2049 two incompatible decls in the same scope; we are to silently
2050 replace the old one (duplicate_decls has issued all appropriate
2051 diagnostics). In particular, we should not consider possible
2052 duplicates in the external scope, or shadowing. */
2053 b = I_SYMBOL_BINDING (name);
2054 if (b && B_IN_SCOPE (b, scope))
2056 struct c_binding *b_ext, *b_use;
2057 tree type = TREE_TYPE (x);
2058 tree visdecl = b->decl;
2059 tree vistype = TREE_TYPE (visdecl);
2060 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2061 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2062 b->inner_comp = false;
2065 /* If this is an external linkage declaration, we should check
2066 for compatibility with the type in the external scope before
2067 setting the type at this scope based on the visible
2068 information only. */
2069 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2071 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2072 b_ext = b_ext->shadowed;
2077 TREE_TYPE (b_use->decl) = b_use->type;
2080 if (duplicate_decls (x, b_use->decl))
2084 /* Save the updated type in the external scope and
2085 restore the proper type for this scope. */
2087 if (comptypes (vistype, type))
2088 thistype = composite_type (vistype, type);
2090 thistype = TREE_TYPE (b_use->decl);
2091 b_use->type = TREE_TYPE (b_use->decl);
2092 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2093 && DECL_BUILT_IN (b_use->decl))
2095 = build_type_attribute_variant (thistype,
2098 TREE_TYPE (b_use->decl) = thistype;
2103 goto skip_external_and_shadow_checks;
2106 /* All declarations with external linkage, and all external
2107 references, go in the external scope, no matter what scope is
2108 current. However, the binding in that scope is ignored for
2109 purposes of normal name lookup. A separate binding structure is
2110 created in the requested scope; this governs the normal
2111 visibility of the symbol.
2113 The binding in the externals scope is used exclusively for
2114 detecting duplicate declarations of the same object, no matter
2115 what scope they are in; this is what we do here. (C99 6.2.7p2:
2116 All declarations that refer to the same object or function shall
2117 have compatible type; otherwise, the behavior is undefined.) */
2118 if (DECL_EXTERNAL (x) || scope == file_scope)
2120 tree type = TREE_TYPE (x);
2123 bool type_saved = false;
2124 if (b && !B_IN_EXTERNAL_SCOPE (b)
2125 && (TREE_CODE (b->decl) == FUNCTION_DECL
2126 || TREE_CODE (b->decl) == VAR_DECL)
2127 && DECL_FILE_SCOPE_P (b->decl))
2130 vistype = TREE_TYPE (visdecl);
2132 if (scope != file_scope
2133 && !DECL_IN_SYSTEM_HEADER (x))
2134 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2136 while (b && !B_IN_EXTERNAL_SCOPE (b))
2138 /* If this decl might be modified, save its type. This is
2139 done here rather than when the decl is first bound
2140 because the type may change after first binding, through
2141 being completed or through attributes being added. If we
2142 encounter multiple such decls, only the first should have
2143 its type saved; the others will already have had their
2144 proper types saved and the types will not have changed as
2145 their scopes will not have been re-entered. */
2146 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2148 b->type = TREE_TYPE (b->decl);
2151 if (B_IN_FILE_SCOPE (b)
2152 && TREE_CODE (b->decl) == VAR_DECL
2153 && TREE_STATIC (b->decl)
2154 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2155 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2156 && TREE_CODE (type) == ARRAY_TYPE
2157 && TYPE_DOMAIN (type)
2158 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2159 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2161 /* Array type completed in inner scope, which should be
2162 diagnosed if the completion does not have size 1 and
2163 it does not get completed in the file scope. */
2164 b->inner_comp = true;
2169 /* If a matching external declaration has been found, set its
2170 type to the composite of all the types of that declaration.
2171 After the consistency checks, it will be reset to the
2172 composite of the visible types only. */
2173 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2175 TREE_TYPE (b->decl) = b->type;
2177 /* The point of the same_translation_unit_p check here is,
2178 we want to detect a duplicate decl for a construct like
2179 foo() { extern bar(); } ... static bar(); but not if
2180 they are in different translation units. In any case,
2181 the static does not go in the externals scope. */
2183 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2184 && duplicate_decls (x, b->decl))
2189 if (comptypes (vistype, type))
2190 thistype = composite_type (vistype, type);
2192 thistype = TREE_TYPE (b->decl);
2196 b->type = TREE_TYPE (b->decl);
2197 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2199 = build_type_attribute_variant (thistype,
2200 TYPE_ATTRIBUTES (b->type));
2201 TREE_TYPE (b->decl) = thistype;
2202 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2205 else if (TREE_PUBLIC (x))
2207 if (visdecl && !b && duplicate_decls (x, visdecl))
2209 /* An external declaration at block scope referring to a
2210 visible entity with internal linkage. The composite
2211 type will already be correct for this scope, so we
2212 just need to fall through to make the declaration in
2219 bind (name, x, external_scope, /*invisible=*/true,
2226 if (TREE_CODE (x) != PARM_DECL)
2227 warn_if_shadowing (x);
2229 skip_external_and_shadow_checks:
2230 if (TREE_CODE (x) == TYPE_DECL)
2231 clone_underlying_type (x);
2233 bind (name, x, scope, /*invisible=*/false, nested);
2235 /* If x's type is incomplete because it's based on a
2236 structure or union which has not yet been fully declared,
2237 attach it to that structure or union type, so we can go
2238 back and complete the variable declaration later, if the
2239 structure or union gets fully declared.
2241 If the input is erroneous, we can have error_mark in the type
2242 slot (e.g. "f(void a, ...)") - that doesn't count as an
2244 if (TREE_TYPE (x) != error_mark_node
2245 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2247 tree element = TREE_TYPE (x);
2249 while (TREE_CODE (element) == ARRAY_TYPE)
2250 element = TREE_TYPE (element);
2251 element = TYPE_MAIN_VARIANT (element);
2253 if ((TREE_CODE (element) == RECORD_TYPE
2254 || TREE_CODE (element) == UNION_TYPE)
2255 && (TREE_CODE (x) != TYPE_DECL
2256 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2257 && !COMPLETE_TYPE_P (element))
2258 C_TYPE_INCOMPLETE_VARS (element)
2259 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2264 /* Record X as belonging to file scope.
2265 This is used only internally by the Objective-C front end,
2266 and is limited to its needs. duplicate_decls is not called;
2267 if there is any preexisting decl for this identifier, it is an ICE. */
2270 pushdecl_top_level (tree x)
2273 bool nested = false;
2274 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2276 name = DECL_NAME (x);
2278 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2280 if (TREE_PUBLIC (x))
2282 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2286 bind (name, x, file_scope, /*invisible=*/false, nested);
2292 implicit_decl_warning (tree id, tree olddecl)
2294 void (*diag) (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
2295 switch (mesg_implicit_function_declaration)
2298 case 1: diag = warning0; break;
2299 case 2: diag = error; break;
2300 default: gcc_unreachable ();
2303 diag (G_("implicit declaration of function %qE"), id);
2305 locate_old_decl (olddecl, diag);
2308 /* Generate an implicit declaration for identifier FUNCTIONID as a
2309 function of type int (). */
2312 implicitly_declare (tree functionid)
2314 struct c_binding *b;
2318 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2320 if (B_IN_SCOPE (b, external_scope))
2329 if (decl == error_mark_node)
2332 /* FIXME: Objective-C has weird not-really-builtin functions
2333 which are supposed to be visible automatically. They wind up
2334 in the external scope because they're pushed before the file
2335 scope gets created. Catch this here and rebind them into the
2337 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2339 bind (functionid, decl, file_scope,
2340 /*invisible=*/false, /*nested=*/true);
2345 tree newtype = default_function_type;
2347 TREE_TYPE (decl) = b->type;
2348 /* Implicit declaration of a function already declared
2349 (somehow) in a different scope, or as a built-in.
2350 If this is the first time this has happened, warn;
2351 then recycle the old declaration but with the new type. */
2352 if (!C_DECL_IMPLICIT (decl))
2354 implicit_decl_warning (functionid, decl);
2355 C_DECL_IMPLICIT (decl) = 1;
2357 if (DECL_BUILT_IN (decl))
2359 newtype = build_type_attribute_variant (newtype,
2361 (TREE_TYPE (decl)));
2362 if (!comptypes (newtype, TREE_TYPE (decl)))
2364 warning (0, "incompatible implicit declaration of built-in"
2365 " function %qD", decl);
2366 newtype = TREE_TYPE (decl);
2371 if (!comptypes (newtype, TREE_TYPE (decl)))
2373 error ("incompatible implicit declaration of function %qD",
2375 locate_old_decl (decl, error);
2378 b->type = TREE_TYPE (decl);
2379 TREE_TYPE (decl) = newtype;
2380 bind (functionid, decl, current_scope,
2381 /*invisible=*/false, /*nested=*/true);
2386 /* Not seen before. */
2387 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2388 DECL_EXTERNAL (decl) = 1;
2389 TREE_PUBLIC (decl) = 1;
2390 C_DECL_IMPLICIT (decl) = 1;
2391 implicit_decl_warning (functionid, 0);
2392 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2394 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2396 /* C89 says implicit declarations are in the innermost block.
2397 So we record the decl in the standard fashion. */
2398 decl = pushdecl (decl);
2400 /* No need to call objc_check_decl here - it's a function type. */
2401 rest_of_decl_compilation (decl, 0, 0);
2403 /* Write a record describing this implicit function declaration
2404 to the prototypes file (if requested). */
2405 gen_aux_info_record (decl, 0, 1, 0);
2407 /* Possibly apply some default attributes to this implicit declaration. */
2408 decl_attributes (&decl, NULL_TREE, 0);
2413 /* Issue an error message for a reference to an undeclared variable
2414 ID, including a reference to a builtin outside of function-call
2415 context. Establish a binding of the identifier to error_mark_node
2416 in an appropriate scope, which will suppress further errors for the
2417 same identifier. The error message should be given location LOC. */
2419 undeclared_variable (tree id, location_t loc)
2421 static bool already = false;
2422 struct c_scope *scope;
2424 if (current_function_decl == 0)
2426 error ("%H%qE undeclared here (not in a function)", &loc, id);
2427 scope = current_scope;
2431 error ("%H%qE undeclared (first use in this function)", &loc, id);
2435 error ("%H(Each undeclared identifier is reported only once", &loc);
2436 error ("%Hfor each function it appears in.)", &loc);
2440 /* If we are parsing old-style parameter decls, current_function_decl
2441 will be nonnull but current_function_scope will be null. */
2442 scope = current_function_scope ? current_function_scope : current_scope;
2444 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2447 /* Subroutine of lookup_label, declare_label, define_label: construct a
2448 LABEL_DECL with all the proper frills. */
2451 make_label (tree name, location_t location)
2453 tree label = build_decl (LABEL_DECL, name, void_type_node);
2455 DECL_CONTEXT (label) = current_function_decl;
2456 DECL_MODE (label) = VOIDmode;
2457 DECL_SOURCE_LOCATION (label) = location;
2462 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2463 Create one if none exists so far for the current function.
2464 This is called when a label is used in a goto expression or
2465 has its address taken. */
2468 lookup_label (tree name)
2472 if (current_function_decl == 0)
2474 error ("label %qE referenced outside of any function", name);
2478 /* Use a label already defined or ref'd with this name, but not if
2479 it is inherited from a containing function and wasn't declared
2481 label = I_LABEL_DECL (name);
2482 if (label && (DECL_CONTEXT (label) == current_function_decl
2483 || C_DECLARED_LABEL_FLAG (label)))
2485 /* If the label has only been declared, update its apparent
2486 location to point here, for better diagnostics if it
2487 turns out not to have been defined. */
2488 if (!TREE_USED (label))
2489 DECL_SOURCE_LOCATION (label) = input_location;
2493 /* No label binding for that identifier; make one. */
2494 label = make_label (name, input_location);
2496 /* Ordinary labels go in the current function scope. */
2497 bind (name, label, current_function_scope,
2498 /*invisible=*/false, /*nested=*/false);
2502 /* Make a label named NAME in the current function, shadowing silently
2503 any that may be inherited from containing functions or containing
2504 scopes. This is called for __label__ declarations. */
2507 declare_label (tree name)
2509 struct c_binding *b = I_LABEL_BINDING (name);
2512 /* Check to make sure that the label hasn't already been declared
2514 if (b && B_IN_CURRENT_SCOPE (b))
2516 error ("duplicate label declaration %qE", name);
2517 locate_old_decl (b->decl, error);
2519 /* Just use the previous declaration. */
2523 label = make_label (name, input_location);
2524 C_DECLARED_LABEL_FLAG (label) = 1;
2526 /* Declared labels go in the current scope. */
2527 bind (name, label, current_scope,
2528 /*invisible=*/false, /*nested=*/false);
2532 /* Define a label, specifying the location in the source file.
2533 Return the LABEL_DECL node for the label, if the definition is valid.
2534 Otherwise return 0. */
2537 define_label (location_t location, tree name)
2539 /* Find any preexisting label with this name. It is an error
2540 if that label has already been defined in this function, or
2541 if there is a containing function with a declared label with
2543 tree label = I_LABEL_DECL (name);
2544 struct c_label_list *nlist_se, *nlist_vm;
2547 && ((DECL_CONTEXT (label) == current_function_decl
2548 && DECL_INITIAL (label) != 0)
2549 || (DECL_CONTEXT (label) != current_function_decl
2550 && C_DECLARED_LABEL_FLAG (label))))
2552 error ("%Hduplicate label %qD", &location, label);
2553 locate_old_decl (label, error);
2556 else if (label && DECL_CONTEXT (label) == current_function_decl)
2558 /* The label has been used or declared already in this function,
2559 but not defined. Update its location to point to this
2561 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2562 error ("%Jjump into statement expression", label);
2563 if (C_DECL_UNDEFINABLE_VM (label))
2564 error ("%Jjump into scope of identifier with variably modified type",
2566 DECL_SOURCE_LOCATION (label) = location;
2570 /* No label binding for that identifier; make one. */
2571 label = make_label (name, location);
2573 /* Ordinary labels go in the current function scope. */
2574 bind (name, label, current_function_scope,
2575 /*invisible=*/false, /*nested=*/false);
2578 if (!in_system_header && lookup_name (name))
2579 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2580 "for labels, identifier %qE conflicts", &location, name);
2582 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2583 nlist_se->next = label_context_stack_se->labels_def;
2584 nlist_se->label = label;
2585 label_context_stack_se->labels_def = nlist_se;
2587 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2588 nlist_vm->next = label_context_stack_vm->labels_def;
2589 nlist_vm->label = label;
2590 label_context_stack_vm->labels_def = nlist_vm;
2592 /* Mark label as having been defined. */
2593 DECL_INITIAL (label) = error_mark_node;
2597 /* Given NAME, an IDENTIFIER_NODE,
2598 return the structure (or union or enum) definition for that name.
2599 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2600 CODE says which kind of type the caller wants;
2601 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2602 If the wrong kind of type is found, an error is reported. */
2605 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2607 struct c_binding *b = I_TAG_BINDING (name);
2613 /* We only care about whether it's in this level if
2614 thislevel_only was set or it might be a type clash. */
2615 if (thislevel_only || TREE_CODE (b->decl) != code)
2617 /* For our purposes, a tag in the external scope is the same as
2618 a tag in the file scope. (Primarily relevant to Objective-C
2619 and its builtin structure tags, which get pushed before the
2620 file scope is created.) */
2621 if (B_IN_CURRENT_SCOPE (b)
2622 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2626 if (thislevel_only && !thislevel)
2629 if (TREE_CODE (b->decl) != code)
2631 /* Definition isn't the kind we were looking for. */
2632 pending_invalid_xref = name;
2633 pending_invalid_xref_location = input_location;
2635 /* If in the same binding level as a declaration as a tag
2636 of a different type, this must not be allowed to
2637 shadow that tag, so give the error immediately.
2638 (For example, "struct foo; union foo;" is invalid.) */
2640 pending_xref_error ();
2645 /* Print an error message now
2646 for a recent invalid struct, union or enum cross reference.
2647 We don't print them immediately because they are not invalid
2648 when used in the `struct foo;' construct for shadowing. */
2651 pending_xref_error (void)
2653 if (pending_invalid_xref != 0)
2654 error ("%H%qE defined as wrong kind of tag",
2655 &pending_invalid_xref_location, pending_invalid_xref);
2656 pending_invalid_xref = 0;
2660 /* Look up NAME in the current scope and its superiors
2661 in the namespace of variables, functions and typedefs.
2662 Return a ..._DECL node of some kind representing its definition,
2663 or return 0 if it is undefined. */
2666 lookup_name (tree name)
2668 struct c_binding *b = I_SYMBOL_BINDING (name);
2669 if (b && !b->invisible)
2674 /* Similar to `lookup_name' for the benefit of common code and the C++
2678 lookup_name_two (tree name, int ARG_UNUSED (prefer_type))
2680 return lookup_name (name);
2683 /* Similar to `lookup_name' but look only at the indicated scope. */
2686 lookup_name_in_scope (tree name, struct c_scope *scope)
2688 struct c_binding *b;
2690 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2691 if (B_IN_SCOPE (b, scope))
2696 /* Create the predefined scalar types of C,
2697 and some nodes representing standard constants (0, 1, (void *) 0).
2698 Initialize the global scope.
2699 Make definitions for built-in primitive functions. */
2702 c_init_decl_processing (void)
2704 location_t save_loc = input_location;
2706 /* Initialize reserved words for parser. */
2709 current_function_decl = 0;
2711 gcc_obstack_init (&parser_obstack);
2713 /* Make the externals scope. */
2715 external_scope = current_scope;
2717 /* Declarations from c_common_nodes_and_builtins must not be associated
2718 with this input file, lest we get differences between using and not
2719 using preprocessed headers. */
2720 #ifdef USE_MAPPED_LOCATION
2721 input_location = BUILTINS_LOCATION;
2723 input_location.file = "<built-in>";
2724 input_location.line = 0;
2727 build_common_tree_nodes (flag_signed_char, false);
2729 c_common_nodes_and_builtins ();
2731 /* In C, comparisons and TRUTH_* expressions have type int. */
2732 truthvalue_type_node = integer_type_node;
2733 truthvalue_true_node = integer_one_node;
2734 truthvalue_false_node = integer_zero_node;
2736 /* Even in C99, which has a real boolean type. */
2737 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2738 boolean_type_node));
2740 input_location = save_loc;
2742 pedantic_lvalues = true;
2744 make_fname_decl = c_make_fname_decl;
2745 start_fname_decls ();
2748 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2749 decl, NAME is the initialization string and TYPE_DEP indicates whether
2750 NAME depended on the type of the function. As we don't yet implement
2751 delayed emission of static data, we mark the decl as emitted
2752 so it is not placed in the output. Anything using it must therefore pull
2753 out the STRING_CST initializer directly. FIXME. */
2756 c_make_fname_decl (tree id, int type_dep)
2758 const char *name = fname_as_string (type_dep);
2759 tree decl, type, init;
2760 size_t length = strlen (name);
2762 type = build_array_type (char_type_node,
2763 build_index_type (size_int (length)));
2764 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2766 decl = build_decl (VAR_DECL, id, type);
2768 TREE_STATIC (decl) = 1;
2769 TREE_READONLY (decl) = 1;
2770 DECL_ARTIFICIAL (decl) = 1;
2772 init = build_string (length + 1, name);
2773 free ((char *) name);
2774 TREE_TYPE (init) = type;
2775 DECL_INITIAL (decl) = init;
2777 TREE_USED (decl) = 1;
2779 if (current_function_decl)
2781 DECL_CONTEXT (decl) = current_function_decl;
2782 bind (id, decl, current_function_scope,
2783 /*invisible=*/false, /*nested=*/false);
2786 finish_decl (decl, init, NULL_TREE);
2791 /* Return a definition for a builtin function named NAME and whose data type
2792 is TYPE. TYPE should be a function type with argument types.
2793 FUNCTION_CODE tells later passes how to compile calls to this function.
2794 See tree.h for its possible values.
2796 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2797 the name to be called if we can't opencode the function. If
2798 ATTRS is nonzero, use that for the function's attribute list. */
2801 builtin_function (const char *name, tree type, int function_code,
2802 enum built_in_class cl, const char *library_name,
2805 tree id = get_identifier (name);
2806 tree decl = build_decl (FUNCTION_DECL, id, type);
2807 TREE_PUBLIC (decl) = 1;
2808 DECL_EXTERNAL (decl) = 1;
2809 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2810 DECL_BUILT_IN_CLASS (decl) = cl;
2811 DECL_FUNCTION_CODE (decl) = function_code;
2812 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2814 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2816 /* Should never be called on a symbol with a preexisting meaning. */
2817 gcc_assert (!I_SYMBOL_BINDING (id));
2819 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2821 /* Builtins in the implementation namespace are made visible without
2822 needing to be explicitly declared. See push_file_scope. */
2823 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2825 TREE_CHAIN (decl) = visible_builtins;
2826 visible_builtins = decl;
2829 /* Possibly apply some default attributes to this built-in function. */
2831 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2833 decl_attributes (&decl, NULL_TREE, 0);
2838 /* Called when a declaration is seen that contains no names to declare.
2839 If its type is a reference to a structure, union or enum inherited
2840 from a containing scope, shadow that tag name for the current scope
2841 with a forward reference.
2842 If its type defines a new named structure or union
2843 or defines an enum, it is valid but we need not do anything here.
2844 Otherwise, it is an error. */
2847 shadow_tag (const struct c_declspecs *declspecs)
2849 shadow_tag_warned (declspecs, 0);
2852 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2855 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2857 bool found_tag = false;
2859 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2861 tree value = declspecs->type;
2862 enum tree_code code = TREE_CODE (value);
2864 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2865 /* Used to test also that TYPE_SIZE (value) != 0.
2866 That caused warning for `struct foo;' at top level in the file. */
2868 tree name = TYPE_NAME (value);
2875 if (warned != 1 && code != ENUMERAL_TYPE)
2876 /* Empty unnamed enum OK */
2878 pedwarn ("unnamed struct/union that defines no instances");
2882 else if (!declspecs->tag_defined_p
2883 && declspecs->storage_class != csc_none)
2886 pedwarn ("empty declaration with storage class specifier "
2887 "does not redeclare tag");
2889 pending_xref_error ();
2891 else if (!declspecs->tag_defined_p
2892 && (declspecs->const_p
2893 || declspecs->volatile_p
2894 || declspecs->restrict_p))
2897 pedwarn ("empty declaration with type qualifier "
2898 "does not redeclare tag");
2900 pending_xref_error ();
2904 pending_invalid_xref = 0;
2905 t = lookup_tag (code, name, 1);
2909 t = make_node (code);
2916 if (warned != 1 && !in_system_header)
2918 pedwarn ("useless type name in empty declaration");
2923 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2925 pedwarn ("useless type name in empty declaration");
2929 pending_invalid_xref = 0;
2931 if (declspecs->inline_p)
2933 error ("%<inline%> in empty declaration");
2937 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2939 error ("%<auto%> in file-scope empty declaration");
2943 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2945 error ("%<register%> in file-scope empty declaration");
2949 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2951 warning (0, "useless storage class specifier in empty declaration");
2955 if (!warned && !in_system_header && declspecs->thread_p)
2957 warning (0, "useless %<__thread%> in empty declaration");
2961 if (!warned && !in_system_header && (declspecs->const_p
2962 || declspecs->volatile_p
2963 || declspecs->restrict_p))
2965 warning (0, "useless type qualifier in empty declaration");
2972 pedwarn ("empty declaration");
2977 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2978 bits. SPECS represents declaration specifiers that the grammar
2979 only permits to contain type qualifiers and attributes. */
2982 quals_from_declspecs (const struct c_declspecs *specs)
2984 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2985 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2986 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2987 gcc_assert (!specs->type
2988 && !specs->decl_attr
2989 && specs->typespec_word == cts_none
2990 && specs->storage_class == csc_none
2991 && !specs->typedef_p
2992 && !specs->explicit_signed_p
2993 && !specs->deprecated_p
2995 && !specs->long_long_p
2998 && !specs->unsigned_p
2999 && !specs->complex_p
3001 && !specs->thread_p);
3005 /* Construct an array declarator. EXPR is the expression inside [], or
3006 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3007 to the pointer to which a parameter array is converted). STATIC_P is
3008 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
3009 is true if the array is [*], a VLA of unspecified length which is
3010 nevertheless a complete type (not currently implemented by GCC),
3011 false otherwise. The field for the contained declarator is left to be
3012 filled in by set_array_declarator_inner. */
3014 struct c_declarator *
3015 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3018 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3019 struct c_declarator);
3020 declarator->kind = cdk_array;
3021 declarator->declarator = 0;
3022 declarator->u.array.dimen = expr;
3025 declarator->u.array.attrs = quals->attrs;
3026 declarator->u.array.quals = quals_from_declspecs (quals);
3030 declarator->u.array.attrs = NULL_TREE;
3031 declarator->u.array.quals = 0;
3033 declarator->u.array.static_p = static_p;
3034 declarator->u.array.vla_unspec_p = vla_unspec_p;
3035 if (pedantic && !flag_isoc99)
3037 if (static_p || quals != NULL)
3038 pedwarn ("ISO C90 does not support %<static%> or type "
3039 "qualifiers in parameter array declarators");
3041 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3044 warning (0, "GCC does not yet properly implement %<[*]%> array declarators");
3048 /* Set the contained declarator of an array declarator. DECL is the
3049 declarator, as constructed by build_array_declarator; INNER is what
3050 appears on the left of the []. ABSTRACT_P is true if it is an
3051 abstract declarator, false otherwise; this is used to reject static
3052 and type qualifiers in abstract declarators, where they are not in
3053 the C99 grammar (subject to possible change in DR#289). */
3055 struct c_declarator *
3056 set_array_declarator_inner (struct c_declarator *decl,
3057 struct c_declarator *inner, bool abstract_p)
3059 decl->declarator = inner;
3060 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
3061 || decl->u.array.attrs != NULL_TREE
3062 || decl->u.array.static_p))
3063 error ("static or type qualifiers in abstract declarator");
3067 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3070 groktypename (struct c_type_name *type_name)
3073 tree attrs = type_name->specs->attrs;
3075 type_name->specs->attrs = NULL_TREE;
3077 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3080 /* Apply attributes. */
3081 decl_attributes (&type, attrs, 0);
3086 /* Decode a declarator in an ordinary declaration or data definition.
3087 This is called as soon as the type information and variable name
3088 have been parsed, before parsing the initializer if any.
3089 Here we create the ..._DECL node, fill in its type,
3090 and put it on the list of decls for the current context.
3091 The ..._DECL node is returned as the value.
3093 Exception: for arrays where the length is not specified,
3094 the type is left null, to be filled in by `finish_decl'.
3096 Function definitions do not come here; they go to start_function
3097 instead. However, external and forward declarations of functions
3098 do go through here. Structure field declarations are done by
3099 grokfield and not through here. */
3102 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3103 bool initialized, tree attributes)
3108 /* An object declared as __attribute__((deprecated)) suppresses
3109 warnings of uses of other deprecated items. */
3110 if (lookup_attribute ("deprecated", attributes))
3111 deprecated_state = DEPRECATED_SUPPRESS;
3113 decl = grokdeclarator (declarator, declspecs,
3114 NORMAL, initialized, NULL);
3118 deprecated_state = DEPRECATED_NORMAL;
3120 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3121 && MAIN_NAME_P (DECL_NAME (decl)))
3122 warning (OPT_Wmain, "%q+D is usually a function", decl);
3125 /* Is it valid for this decl to have an initializer at all?
3126 If not, set INITIALIZED to zero, which will indirectly
3127 tell 'finish_decl' to ignore the initializer once it is parsed. */
3128 switch (TREE_CODE (decl))
3131 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3136 error ("function %qD is initialized like a variable", decl);
3141 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3142 error ("parameter %qD is initialized", decl);
3147 /* Don't allow initializations for incomplete types except for
3148 arrays which might be completed by the initialization. */
3150 /* This can happen if the array size is an undefined macro.
3151 We already gave a warning, so we don't need another one. */
3152 if (TREE_TYPE (decl) == error_mark_node)
3154 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3156 /* A complete type is ok if size is fixed. */
3158 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3159 || C_DECL_VARIABLE_SIZE (decl))
3161 error ("variable-sized object may not be initialized");
3165 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3167 error ("variable %qD has initializer but incomplete type", decl);
3170 else if (C_DECL_VARIABLE_SIZE (decl))
3172 /* Although C99 is unclear about whether incomplete arrays
3173 of VLAs themselves count as VLAs, it does not make
3174 sense to permit them to be initialized given that
3175 ordinary VLAs may not be initialized. */
3176 error ("variable-sized object may not be initialized");
3183 if (current_scope == file_scope)
3184 TREE_STATIC (decl) = 1;
3186 /* Tell 'pushdecl' this is an initialized decl
3187 even though we don't yet have the initializer expression.
3188 Also tell 'finish_decl' it may store the real initializer. */
3189 DECL_INITIAL (decl) = error_mark_node;
3192 /* If this is a function declaration, write a record describing it to the
3193 prototypes file (if requested). */
3195 if (TREE_CODE (decl) == FUNCTION_DECL)
3196 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3198 /* ANSI specifies that a tentative definition which is not merged with
3199 a non-tentative definition behaves exactly like a definition with an
3200 initializer equal to zero. (Section 3.7.2)
3202 -fno-common gives strict ANSI behavior, though this tends to break
3203 a large body of code that grew up without this rule.
3205 Thread-local variables are never common, since there's no entrenched
3206 body of code to break, and it allows more efficient variable references
3207 in the presence of dynamic linking. */
3209 if (TREE_CODE (decl) == VAR_DECL
3211 && TREE_PUBLIC (decl)
3212 && !DECL_THREAD_LOCAL_P (decl)
3214 DECL_COMMON (decl) = 1;
3216 /* Set attributes here so if duplicate decl, will have proper attributes. */
3217 decl_attributes (&decl, attributes, 0);
3219 if (TREE_CODE (decl) == FUNCTION_DECL
3220 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3222 struct c_declarator *ce = declarator;
3224 if (ce->kind == cdk_pointer)
3225 ce = declarator->declarator;
3226 if (ce->kind == cdk_function)
3228 tree args = ce->u.arg_info->parms;
3229 for (; args; args = TREE_CHAIN (args))
3231 tree type = TREE_TYPE (args);
3232 if (type && INTEGRAL_TYPE_P (type)
3233 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3234 DECL_ARG_TYPE (args) = integer_type_node;
3239 if (TREE_CODE (decl) == FUNCTION_DECL
3240 && DECL_DECLARED_INLINE_P (decl)
3241 && DECL_UNINLINABLE (decl)
3242 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3243 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3246 /* Add this decl to the current scope.
3247 TEM may equal DECL or it may be a previous decl of the same name. */
3248 tem = pushdecl (decl);
3250 if (initialized && DECL_EXTERNAL (tem))
3252 DECL_EXTERNAL (tem) = 0;
3253 TREE_STATIC (tem) = 1;
3259 /* Finish processing of a declaration;
3260 install its initial value.
3261 If the length of an array type is not known before,
3262 it must be determined now, from the initial value, or it is an error. */
3265 finish_decl (tree decl, tree init, tree asmspec_tree)
3267 tree type = TREE_TYPE (decl);
3268 int was_incomplete = (DECL_SIZE (decl) == 0);
3269 const char *asmspec = 0;
3271 /* If a name was specified, get the string. */
3272 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3273 && DECL_FILE_SCOPE_P (decl))
3274 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3276 asmspec = TREE_STRING_POINTER (asmspec_tree);
3278 /* If `start_decl' didn't like having an initialization, ignore it now. */
3279 if (init != 0 && DECL_INITIAL (decl) == 0)
3282 /* Don't crash if parm is initialized. */
3283 if (TREE_CODE (decl) == PARM_DECL)
3287 store_init_value (decl, init);
3289 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3290 || TREE_CODE (decl) == FUNCTION_DECL
3291 || TREE_CODE (decl) == FIELD_DECL))
3292 objc_check_decl (decl);
3294 /* Deduce size of array from initialization, if not already known. */
3295 if (TREE_CODE (type) == ARRAY_TYPE
3296 && TYPE_DOMAIN (type) == 0
3297 && TREE_CODE (decl) != TYPE_DECL)
3300 = (TREE_STATIC (decl)
3301 /* Even if pedantic, an external linkage array
3302 may have incomplete type at first. */
3303 ? pedantic && !TREE_PUBLIC (decl)
3304 : !DECL_EXTERNAL (decl));
3306 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3309 /* Get the completed type made by complete_array_type. */
3310 type = TREE_TYPE (decl);
3315 error ("initializer fails to determine size of %q+D", decl);
3320 error ("array size missing in %q+D", decl);
3321 /* If a `static' var's size isn't known,
3322 make it extern as well as static, so it does not get
3324 If it is not `static', then do not mark extern;
3325 finish_incomplete_decl will give it a default size
3326 and it will get allocated. */
3327 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3328 DECL_EXTERNAL (decl) = 1;
3332 error ("zero or negative size array %q+D", decl);
3336 /* For global variables, update the copy of the type that
3337 exists in the binding. */
3338 if (TREE_PUBLIC (decl))
3340 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3341 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3342 b_ext = b_ext->shadowed;
3346 b_ext->type = composite_type (b_ext->type, type);
3357 if (DECL_INITIAL (decl))
3358 TREE_TYPE (DECL_INITIAL (decl)) = type;
3360 layout_decl (decl, 0);
3363 if (TREE_CODE (decl) == VAR_DECL)
3365 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3366 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3367 layout_decl (decl, 0);
3369 if (DECL_SIZE (decl) == 0
3370 /* Don't give an error if we already gave one earlier. */
3371 && TREE_TYPE (decl) != error_mark_node
3372 && (TREE_STATIC (decl)
3373 /* A static variable with an incomplete type
3374 is an error if it is initialized.
3375 Also if it is not file scope.
3376 Otherwise, let it through, but if it is not `extern'
3377 then it may cause an error message later. */
3378 ? (DECL_INITIAL (decl) != 0
3379 || !DECL_FILE_SCOPE_P (decl))
3380 /* An automatic variable with an incomplete type
3382 : !DECL_EXTERNAL (decl)))
3384 error ("storage size of %q+D isn%'t known", decl);
3385 TREE_TYPE (decl) = error_mark_node;
3388 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3389 && DECL_SIZE (decl) != 0)
3391 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3392 constant_expression_warning (DECL_SIZE (decl));
3394 error ("storage size of %q+D isn%'t constant", decl);
3397 if (TREE_USED (type))
3398 TREE_USED (decl) = 1;
3401 /* If this is a function and an assembler name is specified, reset DECL_RTL
3402 so we can give it its new name. Also, update built_in_decls if it
3403 was a normal built-in. */
3404 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3406 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3407 set_builtin_user_assembler_name (decl, asmspec);
3408 set_user_assembler_name (decl, asmspec);
3411 /* If #pragma weak was used, mark the decl weak now. */
3412 maybe_apply_pragma_weak (decl);
3414 /* If this is a variable definition, determine its ELF visibility. */
3415 if (TREE_CODE (decl) == VAR_DECL
3416 && TREE_STATIC (decl)
3417 && !DECL_EXTERNAL (decl))
3418 c_determine_visibility (decl);
3420 /* Output the assembler code and/or RTL code for variables and functions,
3421 unless the type is an undefined structure or union.
3422 If not, it will get done when the type is completed. */
3424 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3426 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3427 if (c_dialect_objc ())
3428 objc_check_decl (decl);
3432 /* If this is not a static variable, issue a warning.
3433 It doesn't make any sense to give an ASMSPEC for an
3434 ordinary, non-register local variable. Historically,
3435 GCC has accepted -- but ignored -- the ASMSPEC in
3437 if (!DECL_FILE_SCOPE_P (decl)
3438 && TREE_CODE (decl) == VAR_DECL
3439 && !C_DECL_REGISTER (decl)
3440 && !TREE_STATIC (decl))
3441 warning (0, "ignoring asm-specifier for non-static local "
3442 "variable %q+D", decl);
3444 set_user_assembler_name (decl, asmspec);
3447 if (DECL_FILE_SCOPE_P (decl))
3449 if (DECL_INITIAL (decl) == NULL_TREE
3450 || DECL_INITIAL (decl) == error_mark_node)
3451 /* Don't output anything
3452 when a tentative file-scope definition is seen.
3453 But at end of compilation, do output code for them. */
3454 DECL_DEFER_OUTPUT (decl) = 1;
3455 rest_of_decl_compilation (decl, true, 0);
3459 /* In conjunction with an ASMSPEC, the `register'
3460 keyword indicates that we should place the variable
3461 in a particular register. */
3462 if (asmspec && C_DECL_REGISTER (decl))
3464 DECL_HARD_REGISTER (decl) = 1;
3465 /* This cannot be done for a structure with volatile
3466 fields, on which DECL_REGISTER will have been
3468 if (!DECL_REGISTER (decl))
3469 error ("cannot put object with volatile field into register");
3472 if (TREE_CODE (decl) != FUNCTION_DECL)
3474 /* If we're building a variable sized type, and we might be
3475 reachable other than via the top of the current binding
3476 level, then create a new BIND_EXPR so that we deallocate
3477 the object at the right time. */
3478 /* Note that DECL_SIZE can be null due to errors. */
3479 if (DECL_SIZE (decl)
3480 && !TREE_CONSTANT (DECL_SIZE (decl))
3481 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3484 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3485 TREE_SIDE_EFFECTS (bind) = 1;
3487 BIND_EXPR_BODY (bind) = push_stmt_list ();
3489 add_stmt (build_stmt (DECL_EXPR, decl));
3494 if (!DECL_FILE_SCOPE_P (decl))
3496 /* Recompute the RTL of a local array now
3497 if it used to be an incomplete type. */
3499 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3501 /* If we used it already as memory, it must stay in memory. */
3502 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3503 /* If it's still incomplete now, no init will save it. */
3504 if (DECL_SIZE (decl) == 0)
3505 DECL_INITIAL (decl) = 0;
3510 /* If this was marked 'used', be sure it will be output. */
3511 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3512 mark_decl_referenced (decl);
3514 if (TREE_CODE (decl) == TYPE_DECL)
3516 if (!DECL_FILE_SCOPE_P (decl)
3517 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3518 add_stmt (build_stmt (DECL_EXPR, decl));
3520 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3523 /* At the end of a declaration, throw away any variable type sizes
3524 of types defined inside that declaration. There is no use
3525 computing them in the following function definition. */
3526 if (current_scope == file_scope)
3527 get_pending_sizes ();
3529 /* Install a cleanup (aka destructor) if one was given. */
3530 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3532 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3535 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3536 tree cleanup_decl = lookup_name (cleanup_id);
3539 /* Build "cleanup(&decl)" for the destructor. */
3540 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3541 cleanup = build_tree_list (NULL_TREE, cleanup);
3542 cleanup = build_function_call (cleanup_decl, cleanup);
3544 /* Don't warn about decl unused; the cleanup uses it. */
3545 TREE_USED (decl) = 1;
3546 TREE_USED (cleanup_decl) = 1;
3548 /* Initialize EH, if we've been told to do so. */
3549 if (flag_exceptions && !c_eh_initialized_p)
3551 c_eh_initialized_p = true;
3552 eh_personality_libfunc
3553 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3554 ? "__gcc_personality_sj0"
3555 : "__gcc_personality_v0");
3556 default_init_unwind_resume_libfunc ();
3557 using_eh_for_cleanups ();
3560 push_cleanup (decl, cleanup, false);
3565 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3568 grokparm (const struct c_parm *parm)
3570 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3573 decl_attributes (&decl, parm->attrs, 0);
3578 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3579 and push that on the current scope. */
3582 push_parm_decl (const struct c_parm *parm)
3586 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3587 decl_attributes (&decl, parm->attrs, 0);
3589 decl = pushdecl (decl);
3591 finish_decl (decl, NULL_TREE, NULL_TREE);
3594 /* Mark all the parameter declarations to date as forward decls.
3595 Also diagnose use of this extension. */
3598 mark_forward_parm_decls (void)
3600 struct c_binding *b;
3602 if (pedantic && !current_scope->warned_forward_parm_decls)
3604 pedwarn ("ISO C forbids forward parameter declarations");
3605 current_scope->warned_forward_parm_decls = true;
3608 for (b = current_scope->bindings; b; b = b->prev)
3609 if (TREE_CODE (b->decl) == PARM_DECL)
3610 TREE_ASM_WRITTEN (b->decl) = 1;
3613 static GTY(()) int compound_literal_number;
3615 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3616 literal, which may be an incomplete array type completed by the
3617 initializer; INIT is a CONSTRUCTOR that initializes the compound
3621 build_compound_literal (tree type, tree init)
3623 /* We do not use start_decl here because we have a type, not a declarator;
3624 and do not use finish_decl because the decl should be stored inside
3625 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3630 if (type == error_mark_node)
3631 return error_mark_node;
3633 decl = build_decl (VAR_DECL, NULL_TREE, type);
3634 DECL_EXTERNAL (decl) = 0;
3635 TREE_PUBLIC (decl) = 0;
3636 TREE_STATIC (decl) = (current_scope == file_scope);
3637 DECL_CONTEXT (decl) = current_function_decl;
3638 TREE_USED (decl) = 1;
3639 TREE_TYPE (decl) = type;
3640 TREE_READONLY (decl) = TYPE_READONLY (type);
3641 store_init_value (decl, init);
3643 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3645 int failure = complete_array_type (&TREE_TYPE (decl),
3646 DECL_INITIAL (decl), true);
3647 gcc_assert (!failure);
3649 type = TREE_TYPE (decl);
3650 TREE_TYPE (DECL_INITIAL (decl)) = type;
3653 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3654 return error_mark_node;
3656 stmt = build_stmt (DECL_EXPR, decl);
3657 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3658 TREE_SIDE_EFFECTS (complit) = 1;
3660 layout_decl (decl, 0);
3662 if (TREE_STATIC (decl))
3664 /* This decl needs a name for the assembler output. We also need
3665 a unique suffix to be added to the name. */
3668 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3669 compound_literal_number);
3670 compound_literal_number++;
3671 DECL_NAME (decl) = get_identifier (name);
3672 DECL_DEFER_OUTPUT (decl) = 1;
3673 DECL_COMDAT (decl) = 1;
3674 DECL_ARTIFICIAL (decl) = 1;
3675 DECL_IGNORED_P (decl) = 1;
3677 rest_of_decl_compilation (decl, 1, 0);
3683 /* Determine whether TYPE is a structure with a flexible array member,
3684 or a union containing such a structure (possibly recursively). */
3687 flexible_array_type_p (tree type)
3690 switch (TREE_CODE (type))
3693 x = TYPE_FIELDS (type);
3696 while (TREE_CHAIN (x) != NULL_TREE)
3698 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3699 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3700 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3701 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3705 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3707 if (flexible_array_type_p (TREE_TYPE (x)))
3716 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3717 replacing with appropriate values if they are invalid. */
3719 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3722 unsigned int max_width;
3723 unsigned HOST_WIDE_INT w;
3724 const char *name = orig_name ? orig_name: _("<anonymous>");
3726 /* Detect and ignore out of range field width and process valid
3728 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3729 || TREE_CODE (*width) != INTEGER_CST)
3731 error ("bit-field %qs width not an integer constant", name);
3732 *width = integer_one_node;
3736 constant_expression_warning (*width);
3737 if (tree_int_cst_sgn (*width) < 0)
3739 error ("negative width in bit-field %qs", name);
3740 *width = integer_one_node;
3742 else if (integer_zerop (*width) && orig_name)
3744 error ("zero width for bit-field %qs", name);
3745 *width = integer_one_node;
3749 /* Detect invalid bit-field type. */
3750 if (TREE_CODE (*type) != INTEGER_TYPE
3751 && TREE_CODE (*type) != BOOLEAN_TYPE
3752 && TREE_CODE (*type) != ENUMERAL_TYPE)
3754 error ("bit-field %qs has invalid type", name);
3755 *type = unsigned_type_node;
3758 type_mv = TYPE_MAIN_VARIANT (*type);
3760 && type_mv != integer_type_node
3761 && type_mv != unsigned_type_node
3762 && type_mv != boolean_type_node)
3763 pedwarn ("type of bit-field %qs is a GCC extension", name);
3765 if (type_mv == boolean_type_node)
3766 max_width = CHAR_TYPE_SIZE;
3768 max_width = TYPE_PRECISION (*type);
3770 if (0 < compare_tree_int (*width, max_width))
3772 error ("width of %qs exceeds its type", name);
3774 *width = build_int_cst (NULL_TREE, w);
3777 w = tree_low_cst (*width, 1);
3779 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3781 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3783 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3784 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3785 warning (0, "%qs is narrower than values of its type", name);
3789 /* Build a bit-field integer type for the given WIDTH and UNSIGNEDP. */
3791 c_build_bitfield_integer_type (unsigned HOST_WIDE_INT width, int unsignedp)
3793 /* Extended integer types of the same width as a standard type have
3794 lesser rank, so those of the same width as int promote to int or
3795 unsigned int and are valid for printf formats expecting int or
3796 unsigned int. To avoid such special cases, avoid creating
3797 extended integer types for bit-fields if a standard integer type
3799 if (width == TYPE_PRECISION (integer_type_node))
3800 return unsignedp ? unsigned_type_node : integer_type_node;
3801 if (width == TYPE_PRECISION (signed_char_type_node))
3802 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3803 if (width == TYPE_PRECISION (short_integer_type_node))
3804 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3805 if (width == TYPE_PRECISION (long_integer_type_node))
3806 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3807 if (width == TYPE_PRECISION (long_long_integer_type_node))
3808 return (unsignedp ? long_long_unsigned_type_node
3809 : long_long_integer_type_node);
3810 return build_nonstandard_integer_type (width, unsignedp);
3813 /* Given declspecs and a declarator,
3814 determine the name and type of the object declared
3815 and construct a ..._DECL node for it.
3816 (In one case we can return a ..._TYPE node instead.
3817 For invalid input we sometimes return 0.)
3819 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3821 DECL_CONTEXT says which syntactic context this declaration is in:
3822 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3823 FUNCDEF for a function definition. Like NORMAL but a few different
3824 error messages in each case. Return value may be zero meaning
3825 this definition is too screwy to try to parse.
3826 PARM for a parameter declaration (either within a function prototype
3827 or before a function body). Make a PARM_DECL, or return void_type_node.
3828 TYPENAME if for a typename (in a cast or sizeof).
3829 Don't make a DECL node; just return the ..._TYPE node.
3830 FIELD for a struct or union field; make a FIELD_DECL.
3831 INITIALIZED is true if the decl has an initializer.
3832 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3833 representing the width of the bit-field.
3835 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3836 It may also be so in the PARM case, for a prototype where the
3837 argument type is specified but not the name.
3839 This function is where the complicated C meanings of `static'
3840 and `extern' are interpreted. */
3843 grokdeclarator (const struct c_declarator *declarator,
3844 struct c_declspecs *declspecs,
3845 enum decl_context decl_context, bool initialized, tree *width)
3847 tree type = declspecs->type;
3848 bool threadp = declspecs->thread_p;
3849 enum c_storage_class storage_class = declspecs->storage_class;
3853 int type_quals = TYPE_UNQUALIFIED;
3854 const char *name, *orig_name;
3855 tree typedef_type = 0;
3856 int funcdef_flag = 0;
3857 bool funcdef_syntax = false;
3858 int size_varies = 0;
3859 tree decl_attr = declspecs->decl_attr;
3860 int array_ptr_quals = TYPE_UNQUALIFIED;
3861 tree array_ptr_attrs = NULL_TREE;
3862 int array_parm_static = 0;
3863 tree returned_attrs = NULL_TREE;
3864 bool bitfield = width != NULL;
3866 struct c_arg_info *arg_info = 0;
3868 if (decl_context == FUNCDEF)
3869 funcdef_flag = 1, decl_context = NORMAL;
3871 /* Look inside a declarator for the name being declared
3872 and get it as a string, for an error message. */
3874 const struct c_declarator *decl = declarator;
3883 funcdef_syntax = (decl->kind == cdk_function);
3884 decl = decl->declarator;
3888 decl = decl->declarator;
3893 name = IDENTIFIER_POINTER (decl->u.id);
3905 /* A function definition's declarator must have the form of
3906 a function declarator. */
3908 if (funcdef_flag && !funcdef_syntax)
3911 /* If this looks like a function definition, make it one,
3912 even if it occurs where parms are expected.
3913 Then store_parm_decls will reject it and not use it as a parm. */
3914 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3915 decl_context = PARM;
3917 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3918 warn_deprecated_use (declspecs->type);
3920 typedef_type = type;
3921 size_varies = C_TYPE_VARIABLE_SIZE (type);
3923 /* Diagnose defaulting to "int". */
3925 if (declspecs->default_int_p && !in_system_header)
3927 /* Issue a warning if this is an ISO C 99 program or if
3928 -Wreturn-type and this is a function, or if -Wimplicit;
3929 prefer the former warning since it is more explicit. */
3930 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3932 warn_about_return_type = 1;
3933 else if (warn_implicit_int || flag_isoc99)
3934 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3937 /* Adjust the type if a bit-field is being declared,
3938 -funsigned-bitfields applied and the type is not explicitly
3940 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
3941 && TREE_CODE (type) == INTEGER_TYPE)
3942 type = c_common_unsigned_type (type);
3944 /* Figure out the type qualifiers for the declaration. There are
3945 two ways a declaration can become qualified. One is something
3946 like `const int i' where the `const' is explicit. Another is
3947 something like `typedef const int CI; CI i' where the type of the
3948 declaration contains the `const'. A third possibility is that
3949 there is a type qualifier on the element type of a typedefed
3950 array type, in which case we should extract that qualifier so
3951 that c_apply_type_quals_to_decls receives the full list of
3952 qualifiers to work with (C90 is not entirely clear about whether
3953 duplicate qualifiers should be diagnosed in this case, but it
3954 seems most appropriate to do so). */
3955 element_type = strip_array_types (type);
3956 constp = declspecs->const_p + TYPE_READONLY (element_type);
3957 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
3958 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
3959 if (pedantic && !flag_isoc99)
3962 pedwarn ("duplicate %<const%>");
3964 pedwarn ("duplicate %<restrict%>");
3966 pedwarn ("duplicate %<volatile%>");
3968 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
3969 type = TYPE_MAIN_VARIANT (type);
3970 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3971 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3972 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3974 /* Warn about storage classes that are invalid for certain
3975 kinds of declarations (parameters, typenames, etc.). */
3979 || storage_class == csc_auto
3980 || storage_class == csc_register
3981 || storage_class == csc_typedef))
3983 if (storage_class == csc_auto
3984 && (pedantic || current_scope == file_scope))
3985 pedwarn ("function definition declared %<auto%>");
3986 if (storage_class == csc_register)
3987 error ("function definition declared %<register%>");
3988 if (storage_class == csc_typedef)
3989 error ("function definition declared %<typedef%>");
3991 error ("function definition declared %<__thread%>");
3993 if (storage_class == csc_auto
3994 || storage_class == csc_register
3995 || storage_class == csc_typedef)
3996 storage_class = csc_none;
3998 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4000 if (decl_context == PARM && storage_class == csc_register)
4004 switch (decl_context)
4007 error ("storage class specified for structure field %qs",
4011 error ("storage class specified for parameter %qs", name);
4014 error ("storage class specified for typename");
4017 storage_class = csc_none;
4021 else if (storage_class == csc_extern
4025 /* 'extern' with initialization is invalid if not at file scope. */
4026 if (current_scope == file_scope)
4027 warning (0, "%qs initialized and declared %<extern%>", name);
4029 error ("%qs has both %<extern%> and initializer", name);
4031 else if (current_scope == file_scope)
4033 if (storage_class == csc_auto)
4034 error ("file-scope declaration of %qs specifies %<auto%>", name);
4035 if (pedantic && storage_class == csc_register)
4036 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
4040 if (storage_class == csc_extern && funcdef_flag)
4041 error ("nested function %qs declared %<extern%>", name);
4042 else if (threadp && storage_class == csc_none)
4044 error ("function-scope %qs implicitly auto and declared "
4051 /* Now figure out the structure of the declarator proper.
4052 Descend through it, creating more complex types, until we reach
4053 the declared identifier (or NULL_TREE, in an absolute declarator).
4054 At each stage we maintain an unqualified version of the type
4055 together with any qualifiers that should be applied to it with
4056 c_build_qualified_type; this way, array types including
4057 multidimensional array types are first built up in unqualified
4058 form and then the qualified form is created with
4059 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4061 while (declarator && declarator->kind != cdk_id)
4063 if (type == error_mark_node)
4065 declarator = declarator->declarator;
4069 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4070 a cdk_pointer (for *...),
4071 a cdk_function (for ...(...)),
4072 a cdk_attrs (for nested attributes),
4073 or a cdk_id (for the name being declared
4074 or the place in an absolute declarator
4075 where the name was omitted).
4076 For the last case, we have just exited the loop.
4078 At this point, TYPE is the type of elements of an array,
4079 or for a function to return, or for a pointer to point to.
4080 After this sequence of ifs, TYPE is the type of the
4081 array or function or pointer, and DECLARATOR has had its
4082 outermost layer removed. */
4084 if (array_ptr_quals != TYPE_UNQUALIFIED
4085 || array_ptr_attrs != NULL_TREE
4086 || array_parm_static)
4088 /* Only the innermost declarator (making a parameter be of
4089 array type which is converted to pointer type)
4090 may have static or type qualifiers. */
4091 error ("static or type qualifiers in non-parameter array declarator");
4092 array_ptr_quals = TYPE_UNQUALIFIED;
4093 array_ptr_attrs = NULL_TREE;
4094 array_parm_static = 0;
4097 switch (declarator->kind)
4101 /* A declarator with embedded attributes. */
4102 tree attrs = declarator->u.attrs;
4103 const struct c_declarator *inner_decl;
4105 declarator = declarator->declarator;
4106 inner_decl = declarator;
4107 while (inner_decl->kind == cdk_attrs)
4108 inner_decl = inner_decl->declarator;
4109 if (inner_decl->kind == cdk_id)
4110 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4111 else if (inner_decl->kind == cdk_function)
4112 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4113 else if (inner_decl->kind == cdk_array)
4114 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4115 returned_attrs = decl_attributes (&type,
4116 chainon (returned_attrs, attrs),
4122 tree itype = NULL_TREE;
4123 tree size = declarator->u.array.dimen;
4124 /* The index is a signed object `sizetype' bits wide. */
4125 tree index_type = c_common_signed_type (sizetype);
4127 array_ptr_quals = declarator->u.array.quals;
4128 array_ptr_attrs = declarator->u.array.attrs;
4129 array_parm_static = declarator->u.array.static_p;
4131 declarator = declarator->declarator;
4133 /* Check for some types that there cannot be arrays of. */
4135 if (VOID_TYPE_P (type))
4137 error ("declaration of %qs as array of voids", name);
4138 type = error_mark_node;
4141 if (TREE_CODE (type) == FUNCTION_TYPE)
4143 error ("declaration of %qs as array of functions", name);
4144 type = error_mark_node;
4147 if (pedantic && !in_system_header && flexible_array_type_p (type))
4148 pedwarn ("invalid use of structure with flexible array member");
4150 if (size == error_mark_node)
4151 type = error_mark_node;
4153 if (type == error_mark_node)
4156 /* If size was specified, set ITYPE to a range-type for
4157 that size. Otherwise, ITYPE remains null. finish_decl
4158 may figure it out from an initial value. */
4162 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4164 STRIP_TYPE_NOPS (size);
4166 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4168 error ("size of array %qs has non-integer type", name);
4169 size = integer_one_node;
4172 if (pedantic && integer_zerop (size))
4173 pedwarn ("ISO C forbids zero-size array %qs", name);
4175 if (TREE_CODE (size) == INTEGER_CST)
4177 constant_expression_warning (size);
4178 if (tree_int_cst_sgn (size) < 0)
4180 error ("size of array %qs is negative", name);
4181 size = integer_one_node;
4186 /* Make sure the array size remains visibly
4187 nonconstant even if it is (eg) a const variable
4188 with known value. */
4191 if (!flag_isoc99 && pedantic)
4193 if (TREE_CONSTANT (size))
4194 pedwarn ("ISO C90 forbids array %qs whose size "
4195 "can%'t be evaluated",
4198 pedwarn ("ISO C90 forbids variable-size array %qs",
4203 if (integer_zerop (size))
4205 /* A zero-length array cannot be represented with
4206 an unsigned index type, which is what we'll
4207 get with build_index_type. Create an
4208 open-ended range instead. */
4209 itype = build_range_type (sizetype, size, NULL_TREE);
4213 /* Arrange for the SAVE_EXPR on the inside of the
4214 MINUS_EXPR, which allows the -1 to get folded
4215 with the +1 that happens when building TYPE_SIZE. */
4217 size = variable_size (size);
4219 /* Compute the maximum valid index, that is, size
4220 - 1. Do the calculation in index_type, so that
4221 if it is a variable the computations will be
4222 done in the proper mode. */
4223 itype = fold_build2 (MINUS_EXPR, index_type,
4224 convert (index_type, size),
4225 convert (index_type,
4228 /* If that overflowed, the array is too big. ???
4229 While a size of INT_MAX+1 technically shouldn't
4230 cause an overflow (because we subtract 1), the
4231 overflow is recorded during the conversion to
4232 index_type, before the subtraction. Handling
4233 this case seems like an unnecessary
4235 if (TREE_CODE (itype) == INTEGER_CST
4236 && TREE_OVERFLOW (itype))
4238 error ("size of array %qs is too large", name);
4239 type = error_mark_node;
4243 itype = build_index_type (itype);
4246 else if (decl_context == FIELD)
4248 if (pedantic && !flag_isoc99 && !in_system_header)
4249 pedwarn ("ISO C90 does not support flexible array members");
4251 /* ISO C99 Flexible array members are effectively
4252 identical to GCC's zero-length array extension. */
4253 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4256 /* Complain about arrays of incomplete types. */
4257 if (!COMPLETE_TYPE_P (type))
4259 error ("array type has incomplete element type");
4260 type = error_mark_node;
4263 type = build_array_type (type, itype);
4265 if (type != error_mark_node)
4268 C_TYPE_VARIABLE_SIZE (type) = 1;
4270 /* The GCC extension for zero-length arrays differs from
4271 ISO flexible array members in that sizeof yields
4273 if (size && integer_zerop (size))
4275 TYPE_SIZE (type) = bitsize_zero_node;
4276 TYPE_SIZE_UNIT (type) = size_zero_node;
4280 if (decl_context != PARM
4281 && (array_ptr_quals != TYPE_UNQUALIFIED
4282 || array_ptr_attrs != NULL_TREE
4283 || array_parm_static))
4285 error ("static or type qualifiers in non-parameter array declarator");
4286 array_ptr_quals = TYPE_UNQUALIFIED;
4287 array_ptr_attrs = NULL_TREE;
4288 array_parm_static = 0;
4294 /* Say it's a definition only for the declarator closest
4295 to the identifier, apart possibly from some
4297 bool really_funcdef = false;
4301 const struct c_declarator *t = declarator->declarator;
4302 while (t->kind == cdk_attrs)
4304 really_funcdef = (t->kind == cdk_id);
4307 /* Declaring a function type. Make sure we have a valid
4308 type for the function to return. */
4309 if (type == error_mark_node)
4314 /* Warn about some types functions can't return. */
4315 if (TREE_CODE (type) == FUNCTION_TYPE)
4317 error ("%qs declared as function returning a function", name);
4318 type = integer_type_node;
4320 if (TREE_CODE (type) == ARRAY_TYPE)
4322 error ("%qs declared as function returning an array", name);
4323 type = integer_type_node;
4326 /* Construct the function type and go to the next
4327 inner layer of declarator. */
4328 arg_info = declarator->u.arg_info;
4329 arg_types = grokparms (arg_info, really_funcdef);
4331 /* Type qualifiers before the return type of the function
4332 qualify the return type, not the function type. */
4335 /* Type qualifiers on a function return type are
4336 normally permitted by the standard but have no
4337 effect, so give a warning at -Wreturn-type.
4338 Qualifiers on a void return type are banned on
4339 function definitions in ISO C; GCC used to used
4340 them for noreturn functions. */
4341 if (VOID_TYPE_P (type) && really_funcdef)
4342 pedwarn ("function definition has qualified void return type");
4344 warning (OPT_Wreturn_type,
4345 "type qualifiers ignored on function return type");
4347 type = c_build_qualified_type (type, type_quals);
4349 type_quals = TYPE_UNQUALIFIED;
4351 type = build_function_type (type, arg_types);
4352 declarator = declarator->declarator;
4354 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4355 the formal parameter list of this FUNCTION_TYPE to point to
4356 the FUNCTION_TYPE node itself. */
4360 for (link = arg_info->tags;
4362 link = TREE_CHAIN (link))
4363 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4369 /* Merge any constancy or volatility into the target type
4372 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4374 pedwarn ("ISO C forbids qualified function types");
4376 type = c_build_qualified_type (type, type_quals);
4379 type = build_pointer_type (type);
4381 /* Process type qualifiers (such as const or volatile)
4382 that were given inside the `*'. */
4383 type_quals = declarator->u.pointer_quals;
4385 declarator = declarator->declarator;
4393 /* Now TYPE has the actual type, apart from any qualifiers in
4396 /* Check the type and width of a bit-field. */
4398 check_bitfield_type_and_width (&type, width, orig_name);
4400 /* Did array size calculations overflow? */
4402 if (TREE_CODE (type) == ARRAY_TYPE
4403 && COMPLETE_TYPE_P (type)
4404 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4405 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4407 error ("size of array %qs is too large", name);
4408 /* If we proceed with the array type as it is, we'll eventually
4409 crash in tree_low_cst(). */
4410 type = error_mark_node;
4413 /* If this is declaring a typedef name, return a TYPE_DECL. */
4415 if (storage_class == csc_typedef)
4418 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4420 pedwarn ("ISO C forbids qualified function types");
4422 type = c_build_qualified_type (type, type_quals);
4423 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4424 if (declspecs->explicit_signed_p)
4425 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4426 decl_attributes (&decl, returned_attrs, 0);
4427 if (declspecs->inline_p)
4428 pedwarn ("typedef %q+D declared %<inline%>", decl);
4432 /* Detect the case of an array type of unspecified size
4433 which came, as such, direct from a typedef name.
4434 We must copy the type, so that each identifier gets
4435 a distinct type, so that each identifier's size can be
4436 controlled separately by its own initializer. */
4438 if (type != 0 && typedef_type != 0
4439 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4440 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4442 type = build_array_type (TREE_TYPE (type), 0);
4444 C_TYPE_VARIABLE_SIZE (type) = 1;
4447 /* If this is a type name (such as, in a cast or sizeof),
4448 compute the type and return it now. */
4450 if (decl_context == TYPENAME)
4452 /* Note that the grammar rejects storage classes in typenames
4454 gcc_assert (storage_class == csc_none && !threadp
4455 && !declspecs->inline_p);
4456 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4458 pedwarn ("ISO C forbids const or volatile function types");
4460 type = c_build_qualified_type (type, type_quals);
4461 decl_attributes (&type, returned_attrs, 0);
4465 /* Aside from typedefs and type names (handle above),
4466 `void' at top level (not within pointer)
4467 is allowed only in public variables.
4468 We don't complain about parms either, but that is because
4469 a better error message can be made later. */
4471 if (VOID_TYPE_P (type) && decl_context != PARM
4472 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4473 && (storage_class == csc_extern
4474 || (current_scope == file_scope
4475 && !(storage_class == csc_static
4476 || storage_class == csc_register)))))
4478 error ("variable or field %qs declared void", name);
4479 type = integer_type_node;
4482 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4483 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4488 if (decl_context == PARM)
4490 tree type_as_written;
4493 /* A parameter declared as an array of T is really a pointer to T.
4494 One declared as a function is really a pointer to a function. */
4496 if (TREE_CODE (type) == ARRAY_TYPE)
4498 /* Transfer const-ness of array into that of type pointed to. */
4499 type = TREE_TYPE (type);
4501 type = c_build_qualified_type (type, type_quals);
4502 type = build_pointer_type (type);
4503 type_quals = array_ptr_quals;
4505 /* We don't yet implement attributes in this context. */
4506 if (array_ptr_attrs != NULL_TREE)
4507 warning (OPT_Wattributes,
4508 "attributes in parameter array declarator ignored");
4512 else if (TREE_CODE (type) == FUNCTION_TYPE)
4514 if (pedantic && type_quals)
4515 pedwarn ("ISO C forbids qualified function types");
4517 type = c_build_qualified_type (type, type_quals);
4518 type = build_pointer_type (type);
4519 type_quals = TYPE_UNQUALIFIED;
4521 else if (type_quals)
4522 type = c_build_qualified_type (type, type_quals);
4524 type_as_written = type;
4526 decl = build_decl (PARM_DECL, declarator->u.id, type);
4528 C_DECL_VARIABLE_SIZE (decl) = 1;
4530 /* Compute the type actually passed in the parmlist,
4531 for the case where there is no prototype.
4532 (For example, shorts and chars are passed as ints.)
4533 When there is a prototype, this is overridden later. */
4535 if (type == error_mark_node)
4536 promoted_type = type;
4538 promoted_type = c_type_promotes_to (type);
4540 DECL_ARG_TYPE (decl) = promoted_type;
4541 if (declspecs->inline_p)
4542 pedwarn ("parameter %q+D declared %<inline%>", decl);
4544 else if (decl_context == FIELD)
4546 /* Note that the grammar rejects storage classes in typenames
4548 gcc_assert (storage_class == csc_none && !threadp
4549 && !declspecs->inline_p);
4551 /* Structure field. It may not be a function. */
4553 if (TREE_CODE (type) == FUNCTION_TYPE)
4555 error ("field %qs declared as a function", name);
4556 type = build_pointer_type (type);
4558 else if (TREE_CODE (type) != ERROR_MARK
4559 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4561 error ("field %qs has incomplete type", name);
4562 type = error_mark_node;
4564 type = c_build_qualified_type (type, type_quals);
4565 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4566 DECL_NONADDRESSABLE_P (decl) = bitfield;
4569 C_DECL_VARIABLE_SIZE (decl) = 1;
4571 else if (TREE_CODE (type) == FUNCTION_TYPE)
4573 if (storage_class == csc_register || threadp)
4575 error ("invalid storage class for function %qs", name);
4577 else if (current_scope != file_scope)
4579 /* Function declaration not at file scope. Storage
4580 classes other than `extern' are not allowed, C99
4581 6.7.1p5, and `extern' makes no difference. However,
4582 GCC allows 'auto', perhaps with 'inline', to support
4583 nested functions. */
4584 if (storage_class == csc_auto)
4587 pedwarn ("invalid storage class for function %qs", name);
4589 else if (storage_class == csc_static)
4591 error ("invalid storage class for function %qs", name);
4593 storage_class = declspecs->storage_class = csc_none;
4599 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4600 decl = build_decl_attribute_variant (decl, decl_attr);
4602 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4604 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4605 pedwarn ("ISO C forbids qualified function types");
4607 /* GNU C interprets a volatile-qualified function type to indicate
4608 that the function does not return. */
4609 if ((type_quals & TYPE_QUAL_VOLATILE)
4610 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4611 warning (0, "%<noreturn%> function returns non-void value");
4613 /* Every function declaration is an external reference
4614 (DECL_EXTERNAL) except for those which are not at file
4615 scope and are explicitly declared "auto". This is
4616 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4617 GCC to signify a forward declaration of a nested function. */
4618 if (storage_class == csc_auto && current_scope != file_scope)
4619 DECL_EXTERNAL (decl) = 0;
4621 DECL_EXTERNAL (decl) = 1;
4623 /* Record absence of global scope for `static' or `auto'. */
4625 = !(storage_class == csc_static || storage_class == csc_auto);
4627 /* For a function definition, record the argument information
4628 block where store_parm_decls will look for it. */
4630 current_function_arg_info = arg_info;
4632 if (declspecs->default_int_p)
4633 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4635 /* Record presence of `inline', if it is reasonable. */
4636 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4638 if (declspecs->inline_p)
4639 pedwarn ("cannot inline function %<main%>");
4641 else if (declspecs->inline_p)
4643 /* Record that the function is declared `inline'. */
4644 DECL_DECLARED_INLINE_P (decl) = 1;
4646 /* Do not mark bare declarations as DECL_INLINE. Doing so
4647 in the presence of multiple declarations can result in
4648 the abstract origin pointing between the declarations,
4649 which will confuse dwarf2out. */
4652 DECL_INLINE (decl) = 1;
4653 if (storage_class == csc_extern)
4654 current_extern_inline = 1;
4657 /* If -finline-functions, assume it can be inlined. This does
4658 two things: let the function be deferred until it is actually
4659 needed, and let dwarf2 know that the function is inlinable. */
4660 else if (flag_inline_trees == 2 && initialized)
4661 DECL_INLINE (decl) = 1;
4665 /* It's a variable. */
4666 /* An uninitialized decl with `extern' is a reference. */
4667 int extern_ref = !initialized && storage_class == csc_extern;
4669 type = c_build_qualified_type (type, type_quals);
4671 /* C99 6.2.2p7: It is invalid (compile-time undefined
4672 behavior) to create an 'extern' declaration for a
4673 variable if there is a global declaration that is
4674 'static' and the global declaration is not visible.
4675 (If the static declaration _is_ currently visible,
4676 the 'extern' declaration is taken to refer to that decl.) */
4677 if (extern_ref && current_scope != file_scope)
4679 tree global_decl = identifier_global_value (declarator->u.id);
4680 tree visible_decl = lookup_name (declarator->u.id);
4683 && global_decl != visible_decl
4684 && TREE_CODE (global_decl) == VAR_DECL
4685 && !TREE_PUBLIC (global_decl))
4686 error ("variable previously declared %<static%> redeclared "
4690 decl = build_decl (VAR_DECL, declarator->u.id, type);
4691 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4693 C_DECL_VARIABLE_SIZE (decl) = 1;
4695 if (declspecs->inline_p)
4696 pedwarn ("variable %q+D declared %<inline%>", decl);
4698 /* At file scope, an initialized extern declaration may follow
4699 a static declaration. In that case, DECL_EXTERNAL will be
4700 reset later in start_decl. */
4701 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4703 /* At file scope, the presence of a `static' or `register' storage
4704 class specifier, or the absence of all storage class specifiers
4705 makes this declaration a definition (perhaps tentative). Also,
4706 the absence of `static' makes it public. */
4707 if (current_scope == file_scope)
4709 TREE_PUBLIC (decl) = storage_class != csc_static;
4710 TREE_STATIC (decl) = !extern_ref;
4712 /* Not at file scope, only `static' makes a static definition. */
4715 TREE_STATIC (decl) = (storage_class == csc_static);
4716 TREE_PUBLIC (decl) = extern_ref;
4721 if (targetm.have_tls)
4722 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4724 /* A mere warning is sure to result in improper semantics
4725 at runtime. Don't bother to allow this to compile. */
4726 error ("thread-local storage not supported for this target");
4730 /* Record `register' declaration for warnings on &
4731 and in case doing stupid register allocation. */
4733 if (storage_class == csc_register)
4735 C_DECL_REGISTER (decl) = 1;
4736 DECL_REGISTER (decl) = 1;
4739 /* Record constancy and volatility. */
4740 c_apply_type_quals_to_decl (type_quals, decl);
4742 /* If a type has volatile components, it should be stored in memory.
4743 Otherwise, the fact that those components are volatile
4744 will be ignored, and would even crash the compiler.
4745 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4746 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4747 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4748 || TREE_CODE (decl) == RESULT_DECL))
4750 /* It is not an error for a structure with volatile fields to
4751 be declared register, but reset DECL_REGISTER since it
4752 cannot actually go in a register. */
4753 int was_reg = C_DECL_REGISTER (decl);
4754 C_DECL_REGISTER (decl) = 0;
4755 DECL_REGISTER (decl) = 0;
4756 c_mark_addressable (decl);
4757 C_DECL_REGISTER (decl) = was_reg;
4760 /* This is the earliest point at which we might know the assembler
4761 name of a variable. Thus, if it's known before this, die horribly. */
4762 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4764 decl_attributes (&decl, returned_attrs, 0);
4770 /* Decode the parameter-list info for a function type or function definition.
4771 The argument is the value returned by `get_parm_info' (or made in parse.y
4772 if there is an identifier list instead of a parameter decl list).
4773 These two functions are separate because when a function returns
4774 or receives functions then each is called multiple times but the order
4775 of calls is different. The last call to `grokparms' is always the one
4776 that contains the formal parameter names of a function definition.
4778 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4780 FUNCDEF_FLAG is true for a function definition, false for
4781 a mere declaration. A nonempty identifier-list gets an error message
4782 when FUNCDEF_FLAG is false. */
4785 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4787 tree arg_types = arg_info->types;
4789 if (arg_types == 0 && !funcdef_flag && !in_system_header)
4790 warning (OPT_Wstrict_prototypes,
4791 "function declaration isn%'t a prototype");
4793 if (arg_types == error_mark_node)
4794 return 0; /* don't set TYPE_ARG_TYPES in this case */
4796 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4799 pedwarn ("parameter names (without types) in function declaration");
4801 arg_info->parms = arg_info->types;
4802 arg_info->types = 0;
4807 tree parm, type, typelt;
4808 unsigned int parmno;
4810 /* If there is a parameter of incomplete type in a definition,
4811 this is an error. In a declaration this is valid, and a
4812 struct or union type may be completed later, before any calls
4813 or definition of the function. In the case where the tag was
4814 first declared within the parameter list, a warning has
4815 already been given. If a parameter has void type, then
4816 however the function cannot be defined or called, so
4819 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4821 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4823 type = TREE_VALUE (typelt);
4824 if (type == error_mark_node)
4827 if (!COMPLETE_TYPE_P (type))
4831 if (DECL_NAME (parm))
4832 error ("parameter %u (%q+D) has incomplete type",
4835 error ("%Jparameter %u has incomplete type",
4838 TREE_VALUE (typelt) = error_mark_node;
4839 TREE_TYPE (parm) = error_mark_node;
4841 else if (VOID_TYPE_P (type))
4843 if (DECL_NAME (parm))
4844 warning (0, "parameter %u (%q+D) has void type",
4847 warning (0, "%Jparameter %u has void type",
4852 if (DECL_NAME (parm) && TREE_USED (parm))
4853 warn_if_shadowing (parm);
4859 /* Take apart the current scope and return a c_arg_info structure with
4860 info on a parameter list just parsed.
4862 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4864 ELLIPSIS being true means the argument list ended in '...' so don't
4865 append a sentinel (void_list_node) to the end of the type-list. */
4868 get_parm_info (bool ellipsis)
4870 struct c_binding *b = current_scope->bindings;
4871 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4878 static bool explained_incomplete_types = false;
4879 bool gave_void_only_once_err = false;
4881 arg_info->parms = 0;
4883 arg_info->types = 0;
4884 arg_info->others = 0;
4886 /* The bindings in this scope must not get put into a block.
4887 We will take care of deleting the binding nodes. */
4888 current_scope->bindings = 0;
4890 /* This function is only called if there was *something* on the
4894 /* A parameter list consisting solely of 'void' indicates that the
4895 function takes no arguments. But if the 'void' is qualified
4896 (by 'const' or 'volatile'), or has a storage class specifier
4897 ('register'), then the behavior is undefined; issue an error.
4898 Typedefs for 'void' are OK (see DR#157). */
4899 if (b->prev == 0 /* one binding */
4900 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4901 && !DECL_NAME (b->decl) /* anonymous */
4902 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4904 if (TREE_THIS_VOLATILE (b->decl)
4905 || TREE_READONLY (b->decl)
4906 || C_DECL_REGISTER (b->decl))
4907 error ("%<void%> as only parameter may not be qualified");
4909 /* There cannot be an ellipsis. */
4911 error ("%<void%> must be the only parameter");
4913 arg_info->types = void_list_node;
4918 types = void_list_node;
4920 /* Break up the bindings list into parms, tags, types, and others;
4921 apply sanity checks; purge the name-to-decl bindings. */
4924 tree decl = b->decl;
4925 tree type = TREE_TYPE (decl);
4926 const char *keyword;
4928 switch (TREE_CODE (decl))
4933 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4934 I_SYMBOL_BINDING (b->id) = b->shadowed;
4937 /* Check for forward decls that never got their actual decl. */
4938 if (TREE_ASM_WRITTEN (decl))
4939 error ("parameter %q+D has just a forward declaration", decl);
4940 /* Check for (..., void, ...) and issue an error. */
4941 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4943 if (!gave_void_only_once_err)
4945 error ("%<void%> must be the only parameter");
4946 gave_void_only_once_err = true;
4951 /* Valid parameter, add it to the list. */
4952 TREE_CHAIN (decl) = parms;
4955 /* Since there is a prototype, args are passed in their
4956 declared types. The back end may override this later. */
4957 DECL_ARG_TYPE (decl) = type;
4958 types = tree_cons (0, type, types);
4962 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4963 case UNION_TYPE: keyword = "union"; goto tag;
4964 case RECORD_TYPE: keyword = "struct"; goto tag;
4966 /* Types may not have tag-names, in which case the type
4967 appears in the bindings list with b->id NULL. */
4970 gcc_assert (I_TAG_BINDING (b->id) == b);
4971 I_TAG_BINDING (b->id) = b->shadowed;
4974 /* Warn about any struct, union or enum tags defined in a
4975 parameter list. The scope of such types is limited to
4976 the parameter list, which is rarely if ever desirable
4977 (it's impossible to call such a function with type-
4978 correct arguments). An anonymous union parm type is
4979 meaningful as a GNU extension, so don't warn for that. */
4980 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4983 /* The %s will be one of 'struct', 'union', or 'enum'. */
4984 warning (0, "%<%s %E%> declared inside parameter list",
4987 /* The %s will be one of 'struct', 'union', or 'enum'. */
4988 warning (0, "anonymous %s declared inside parameter list",
4991 if (!explained_incomplete_types)
4993 warning (0, "its scope is only this definition or declaration,"
4994 " which is probably not what you want");
4995 explained_incomplete_types = true;
4999 tags = tree_cons (b->id, decl, tags);
5005 /* CONST_DECLs appear here when we have an embedded enum,
5006 and TYPE_DECLs appear here when we have an embedded struct
5007 or union. No warnings for this - we already warned about the
5008 type itself. FUNCTION_DECLs appear when there is an implicit
5009 function declaration in the parameter list. */
5011 TREE_CHAIN (decl) = others;
5016 /* error_mark_node appears here when we have an undeclared
5017 variable. Just throw it away. */
5020 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5021 I_SYMBOL_BINDING (b->id) = b->shadowed;
5025 /* Other things that might be encountered. */
5032 b = free_binding_and_advance (b);
5035 arg_info->parms = parms;
5036 arg_info->tags = tags;
5037 arg_info->types = types;
5038 arg_info->others = others;
5042 /* Get the struct, enum or union (CODE says which) with tag NAME.
5043 Define the tag as a forward-reference if it is not defined.
5044 Return a c_typespec structure for the type specifier. */
5047 parser_xref_tag (enum tree_code code, tree name)
5049 struct c_typespec ret;
5050 /* If a cross reference is requested, look up the type
5051 already defined for this tag and return it. */
5053 tree ref = lookup_tag (code, name, 0);
5054 /* If this is the right type of tag, return what we found.
5055 (This reference will be shadowed by shadow_tag later if appropriate.)
5056 If this is the wrong type of tag, do not return it. If it was the
5057 wrong type in the same scope, we will have had an error
5058 message already; if in a different scope and declaring
5059 a name, pending_xref_error will give an error message; but if in a
5060 different scope and not declaring a name, this tag should
5061 shadow the previous declaration of a different type of tag, and
5062 this would not work properly if we return the reference found.
5063 (For example, with "struct foo" in an outer scope, "union foo;"
5064 must shadow that tag with a new one of union type.) */
5065 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5066 if (ref && TREE_CODE (ref) == code)
5072 /* If no such tag is yet defined, create a forward-reference node
5073 and record it as the "definition".
5074 When a real declaration of this type is found,
5075 the forward-reference will be altered into a real type. */
5077 ref = make_node (code);
5078 if (code == ENUMERAL_TYPE)
5080 /* Give the type a default layout like unsigned int
5081 to avoid crashing if it does not get defined. */
5082 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5083 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5084 TYPE_USER_ALIGN (ref) = 0;
5085 TYPE_UNSIGNED (ref) = 1;
5086 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5087 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5088 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5091 pushtag (name, ref);
5097 /* Get the struct, enum or union (CODE says which) with tag NAME.
5098 Define the tag as a forward-reference if it is not defined.
5099 Return a tree for the type. */
5102 xref_tag (enum tree_code code, tree name)
5104 return parser_xref_tag (code, name).spec;
5107 /* Make sure that the tag NAME is defined *in the current scope*
5108 at least as a forward reference.
5109 CODE says which kind of tag NAME ought to be. */
5112 start_struct (enum tree_code code, tree name)
5114 /* If there is already a tag defined at this scope
5115 (as a forward reference), just return it. */
5120 ref = lookup_tag (code, name, 1);
5121 if (ref && TREE_CODE (ref) == code)
5123 if (TYPE_SIZE (ref))
5125 if (code == UNION_TYPE)
5126 error ("redefinition of %<union %E%>", name);
5128 error ("redefinition of %<struct %E%>", name);
5130 else if (C_TYPE_BEING_DEFINED (ref))
5132 if (code == UNION_TYPE)
5133 error ("nested redefinition of %<union %E%>", name);
5135 error ("nested redefinition of %<struct %E%>", name);
5140 /* Otherwise create a forward-reference just so the tag is in scope. */
5142 ref = make_node (code);
5143 pushtag (name, ref);
5146 C_TYPE_BEING_DEFINED (ref) = 1;
5147 TYPE_PACKED (ref) = flag_pack_struct;
5151 /* Process the specs, declarator and width (NULL if omitted)
5152 of a structure component, returning a FIELD_DECL node.
5153 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5155 This is done during the parsing of the struct declaration.
5156 The FIELD_DECL nodes are chained together and the lot of them
5157 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5160 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5165 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5166 && width == NULL_TREE)
5168 /* This is an unnamed decl.
5170 If we have something of the form "union { list } ;" then this
5171 is the anonymous union extension. Similarly for struct.
5173 If this is something of the form "struct foo;", then
5174 If MS extensions are enabled, this is handled as an
5176 Otherwise this is a forward declaration of a structure tag.
5178 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5179 If MS extensions are enabled and foo names a structure, then
5180 again this is an anonymous struct.
5181 Otherwise this is an error.
5183 Oh what a horrid tangled web we weave. I wonder if MS consciously
5184 took this from Plan 9 or if it was an accident of implementation
5185 that took root before someone noticed the bug... */
5187 tree type = declspecs->type;
5188 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5189 || TREE_CODE (type) == UNION_TYPE);
5193 && (flag_ms_extensions || !declspecs->typedef_p))
5195 if (flag_ms_extensions)
5199 else if (TYPE_NAME (type) == NULL)
5206 pedwarn ("declaration does not declare anything");
5210 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5213 value = grokdeclarator (declarator, declspecs, FIELD, false,
5214 width ? &width : NULL);
5216 finish_decl (value, NULL_TREE, NULL_TREE);
5217 DECL_INITIAL (value) = width;
5222 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5223 the list such that this does not present a problem later. */
5226 detect_field_duplicates (tree fieldlist)
5231 /* First, see if there are more than "a few" fields.
5232 This is trivially true if there are zero or one fields. */
5235 x = TREE_CHAIN (fieldlist);
5241 } while (timeout > 0 && x);
5243 /* If there were "few" fields, avoid the overhead of allocating
5244 a hash table. Instead just do the nested traversal thing. */
5247 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5250 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5251 if (DECL_NAME (y) == DECL_NAME (x))
5253 error ("duplicate member %q+D", x);
5254 DECL_NAME (x) = NULL_TREE;
5260 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5263 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5264 if ((y = DECL_NAME (x)) != 0)
5266 slot = htab_find_slot (htab, y, INSERT);
5269 error ("duplicate member %q+D", x);
5270 DECL_NAME (x) = NULL_TREE;
5279 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5280 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5281 ATTRIBUTES are attributes to be applied to the structure. */
5284 finish_struct (tree t, tree fieldlist, tree attributes)
5287 bool toplevel = file_scope == current_scope;
5288 int saw_named_field;
5290 /* If this type was previously laid out as a forward reference,
5291 make sure we lay it out again. */
5295 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5299 for (x = fieldlist; x; x = TREE_CHAIN (x))
5300 if (DECL_NAME (x) != 0)
5305 if (TREE_CODE (t) == UNION_TYPE)
5308 pedwarn ("union has no named members");
5310 pedwarn ("union has no members");
5315 pedwarn ("struct has no named members");
5317 pedwarn ("struct has no members");
5322 /* Install struct as DECL_CONTEXT of each field decl.
5323 Also process specified field sizes, found in the DECL_INITIAL,
5324 storing 0 there after the type has been changed to precision equal
5325 to its width, rather than the precision of the specified standard
5326 type. (Correct layout requires the original type to have been preserved
5329 saw_named_field = 0;
5330 for (x = fieldlist; x; x = TREE_CHAIN (x))
5332 DECL_CONTEXT (x) = t;
5333 DECL_PACKED (x) |= TYPE_PACKED (t);
5335 /* If any field is const, the structure type is pseudo-const. */
5336 if (TREE_READONLY (x))
5337 C_TYPE_FIELDS_READONLY (t) = 1;
5340 /* A field that is pseudo-const makes the structure likewise. */
5341 tree t1 = TREE_TYPE (x);
5342 while (TREE_CODE (t1) == ARRAY_TYPE)
5343 t1 = TREE_TYPE (t1);
5344 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5345 && C_TYPE_FIELDS_READONLY (t1))
5346 C_TYPE_FIELDS_READONLY (t) = 1;
5349 /* Any field that is volatile means variables of this type must be
5350 treated in some ways as volatile. */
5351 if (TREE_THIS_VOLATILE (x))
5352 C_TYPE_FIELDS_VOLATILE (t) = 1;
5354 /* Any field of nominal variable size implies structure is too. */
5355 if (C_DECL_VARIABLE_SIZE (x))
5356 C_TYPE_VARIABLE_SIZE (t) = 1;
5358 if (DECL_INITIAL (x))
5360 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5361 DECL_SIZE (x) = bitsize_int (width);
5362 DECL_BIT_FIELD (x) = 1;
5363 SET_DECL_C_BIT_FIELD (x);
5366 /* Detect flexible array member in an invalid context. */
5367 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5368 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5369 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5370 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5372 if (TREE_CODE (t) == UNION_TYPE)
5374 error ("%Jflexible array member in union", x);
5375 TREE_TYPE (x) = error_mark_node;
5377 else if (TREE_CHAIN (x) != NULL_TREE)
5379 error ("%Jflexible array member not at end of struct", x);
5380 TREE_TYPE (x) = error_mark_node;
5382 else if (!saw_named_field)
5384 error ("%Jflexible array member in otherwise empty struct", x);
5385 TREE_TYPE (x) = error_mark_node;
5389 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5390 && flexible_array_type_p (TREE_TYPE (x)))
5391 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5394 saw_named_field = 1;
5397 detect_field_duplicates (fieldlist);
5399 /* Now we have the nearly final fieldlist. Record it,
5400 then lay out the structure or union (including the fields). */
5402 TYPE_FIELDS (t) = fieldlist;
5406 /* Give bit-fields their proper types. */
5408 tree *fieldlistp = &fieldlist;
5410 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5411 && TREE_TYPE (*fieldlistp) != error_mark_node)
5413 unsigned HOST_WIDE_INT width
5414 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5415 tree type = TREE_TYPE (*fieldlistp);
5416 if (width != TYPE_PRECISION (type))
5418 TREE_TYPE (*fieldlistp)
5419 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5420 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5422 DECL_INITIAL (*fieldlistp) = 0;
5425 fieldlistp = &TREE_CHAIN (*fieldlistp);
5428 /* Now we have the truly final field list.
5429 Store it in this type and in the variants. */
5431 TYPE_FIELDS (t) = fieldlist;
5433 /* If there are lots of fields, sort so we can look through them fast.
5434 We arbitrarily consider 16 or more elts to be "a lot". */
5439 for (x = fieldlist; x; x = TREE_CHAIN (x))
5441 if (len > 15 || DECL_NAME (x) == NULL)
5449 struct lang_type *space;
5450 struct sorted_fields_type *space2;
5452 len += list_length (x);
5454 /* Use the same allocation policy here that make_node uses, to
5455 ensure that this lives as long as the rest of the struct decl.
5456 All decls in an inline function need to be saved. */
5458 space = GGC_CNEW (struct lang_type);
5459 space2 = GGC_NEWVAR (struct sorted_fields_type,
5460 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5464 field_array = &space2->elts[0];
5465 for (x = fieldlist; x; x = TREE_CHAIN (x))
5467 field_array[len++] = x;
5469 /* If there is anonymous struct or union, break out of the loop. */
5470 if (DECL_NAME (x) == NULL)
5473 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5476 TYPE_LANG_SPECIFIC (t) = space;
5477 TYPE_LANG_SPECIFIC (t)->s->len = len;
5478 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5479 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5484 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5486 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5487 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5488 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5489 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5490 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5491 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5492 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5495 /* If this was supposed to be a transparent union, but we can't
5496 make it one, warn and turn off the flag. */
5497 if (TREE_CODE (t) == UNION_TYPE
5498 && TYPE_TRANSPARENT_UNION (t)
5499 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5501 TYPE_TRANSPARENT_UNION (t) = 0;
5502 warning (0, "union cannot be made transparent");
5505 /* If this structure or union completes the type of any previous
5506 variable declaration, lay it out and output its rtl. */
5507 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5511 tree decl = TREE_VALUE (x);
5512 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5513 layout_array_type (TREE_TYPE (decl));
5514 if (TREE_CODE (decl) != TYPE_DECL)
5516 layout_decl (decl, 0);
5517 if (c_dialect_objc ())
5518 objc_check_decl (decl);
5519 rest_of_decl_compilation (decl, toplevel, 0);
5524 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5526 /* Finish debugging output for this type. */
5527 rest_of_type_compilation (t, toplevel);
5529 /* If we're inside a function proper, i.e. not file-scope and not still
5530 parsing parameters, then arrange for the size of a variable sized type
5532 if (cur_stmt_list && variably_modified_type_p (t, NULL))
5533 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5538 /* Lay out the type T, and its element type, and so on. */
5541 layout_array_type (tree t)
5543 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5544 layout_array_type (TREE_TYPE (t));
5548 /* Begin compiling the definition of an enumeration type.
5549 NAME is its name (or null if anonymous).
5550 Returns the type object, as yet incomplete.
5551 Also records info about it so that build_enumerator
5552 may be used to declare the individual values as they are read. */
5555 start_enum (tree name)
5559 /* If this is the real definition for a previous forward reference,
5560 fill in the contents in the same object that used to be the
5561 forward reference. */
5564 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5566 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5568 enumtype = make_node (ENUMERAL_TYPE);
5569 pushtag (name, enumtype);
5572 if (C_TYPE_BEING_DEFINED (enumtype))
5573 error ("nested redefinition of %<enum %E%>", name);
5575 C_TYPE_BEING_DEFINED (enumtype) = 1;
5577 if (TYPE_VALUES (enumtype) != 0)
5579 /* This enum is a named one that has been declared already. */
5580 error ("redeclaration of %<enum %E%>", name);
5582 /* Completely replace its old definition.
5583 The old enumerators remain defined, however. */
5584 TYPE_VALUES (enumtype) = 0;
5587 enum_next_value = integer_zero_node;
5590 if (flag_short_enums)
5591 TYPE_PACKED (enumtype) = 1;
5596 /* After processing and defining all the values of an enumeration type,
5597 install their decls in the enumeration type and finish it off.
5598 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5599 and ATTRIBUTES are the specified attributes.
5600 Returns ENUMTYPE. */
5603 finish_enum (tree enumtype, tree values, tree attributes)
5606 tree minnode = 0, maxnode = 0;
5607 int precision, unsign;
5608 bool toplevel = (file_scope == current_scope);
5609 struct lang_type *lt;
5611 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5613 /* Calculate the maximum value of any enumerator in this type. */
5615 if (values == error_mark_node)
5616 minnode = maxnode = integer_zero_node;
5619 minnode = maxnode = TREE_VALUE (values);
5620 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5622 tree value = TREE_VALUE (pair);
5623 if (tree_int_cst_lt (maxnode, value))
5625 if (tree_int_cst_lt (value, minnode))
5630 /* Construct the final type of this enumeration. It is the same
5631 as one of the integral types - the narrowest one that fits, except
5632 that normally we only go as narrow as int - and signed iff any of
5633 the values are negative. */
5634 unsign = (tree_int_cst_sgn (minnode) >= 0);
5635 precision = MAX (min_precision (minnode, unsign),
5636 min_precision (maxnode, unsign));
5638 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5640 tem = c_common_type_for_size (precision, unsign);
5643 warning (0, "enumeration values exceed range of largest integer");
5644 tem = long_long_integer_type_node;
5648 tem = unsign ? unsigned_type_node : integer_type_node;
5650 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5651 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5652 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5653 TYPE_SIZE (enumtype) = 0;
5655 /* If the precision of the type was specific with an attribute and it
5656 was too small, give an error. Otherwise, use it. */
5657 if (TYPE_PRECISION (enumtype))
5659 if (precision > TYPE_PRECISION (enumtype))
5660 error ("specified mode too small for enumeral values");
5663 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5665 layout_type (enumtype);
5667 if (values != error_mark_node)
5669 /* Change the type of the enumerators to be the enum type. We
5670 need to do this irrespective of the size of the enum, for
5671 proper type checking. Replace the DECL_INITIALs of the
5672 enumerators, and the value slots of the list, with copies
5673 that have the enum type; they cannot be modified in place
5674 because they may be shared (e.g. integer_zero_node) Finally,
5675 change the purpose slots to point to the names of the decls. */
5676 for (pair = values; pair; pair = TREE_CHAIN (pair))
5678 tree enu = TREE_PURPOSE (pair);
5679 tree ini = DECL_INITIAL (enu);
5681 TREE_TYPE (enu) = enumtype;
5683 /* The ISO C Standard mandates enumerators to have type int,
5684 even though the underlying type of an enum type is
5685 unspecified. Here we convert any enumerators that fit in
5686 an int to type int, to avoid promotions to unsigned types
5687 when comparing integers with enumerators that fit in the
5688 int range. When -pedantic is given, build_enumerator()
5689 would have already taken care of those that don't fit. */
5690 if (int_fits_type_p (ini, integer_type_node))
5691 tem = integer_type_node;
5694 ini = convert (tem, ini);
5696 DECL_INITIAL (enu) = ini;
5697 TREE_PURPOSE (pair) = DECL_NAME (enu);
5698 TREE_VALUE (pair) = ini;
5701 TYPE_VALUES (enumtype) = values;
5704 /* Record the min/max values so that we can warn about bit-field
5705 enumerations that are too small for the values. */
5706 lt = GGC_CNEW (struct lang_type);
5707 lt->enum_min = minnode;
5708 lt->enum_max = maxnode;
5709 TYPE_LANG_SPECIFIC (enumtype) = lt;
5711 /* Fix up all variant types of this enum type. */
5712 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5714 if (tem == enumtype)
5716 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5717 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5718 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5719 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5720 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5721 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5722 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5723 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5724 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5725 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5726 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5729 /* Finish debugging output for this type. */
5730 rest_of_type_compilation (enumtype, toplevel);
5735 /* Build and install a CONST_DECL for one value of the
5736 current enumeration type (one that was begun with start_enum).
5737 Return a tree-list containing the CONST_DECL and its value.
5738 Assignment of sequential values by default is handled here. */
5741 build_enumerator (tree name, tree value)
5745 /* Validate and default VALUE. */
5749 /* Don't issue more errors for error_mark_node (i.e. an
5750 undeclared identifier) - just ignore the value expression. */
5751 if (value == error_mark_node)
5753 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5754 || TREE_CODE (value) != INTEGER_CST)
5756 error ("enumerator value for %qE is not an integer constant", name);
5761 value = default_conversion (value);
5762 constant_expression_warning (value);
5766 /* Default based on previous value. */
5767 /* It should no longer be possible to have NON_LVALUE_EXPR
5771 value = enum_next_value;
5773 error ("overflow in enumeration values");
5776 if (pedantic && !int_fits_type_p (value, integer_type_node))
5778 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5779 /* XXX This causes -pedantic to change the meaning of the program.
5780 Remove? -zw 2004-03-15 */
5781 value = convert (integer_type_node, value);
5784 /* Set basis for default for next value. */
5785 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5786 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5788 /* Now create a declaration for the enum value name. */
5790 type = TREE_TYPE (value);
5791 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5792 TYPE_PRECISION (integer_type_node)),
5793 (TYPE_PRECISION (type)
5794 >= TYPE_PRECISION (integer_type_node)
5795 && TYPE_UNSIGNED (type)));
5797 decl = build_decl (CONST_DECL, name, type);
5798 DECL_INITIAL (decl) = convert (type, value);
5801 return tree_cons (decl, value, NULL_TREE);
5805 /* Create the FUNCTION_DECL for a function definition.
5806 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5807 the declaration; they describe the function's name and the type it returns,
5808 but twisted together in a fashion that parallels the syntax of C.
5810 This function creates a binding context for the function body
5811 as well as setting up the FUNCTION_DECL in current_function_decl.
5813 Returns 1 on success. If the DECLARATOR is not suitable for a function
5814 (it defines a datum instead), we return 0, which tells
5815 yyparse to report a parse error. */
5818 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5821 tree decl1, old_decl;
5822 tree restype, resdecl;
5823 struct c_label_context_se *nstack_se;
5824 struct c_label_context_vm *nstack_vm;
5826 current_function_returns_value = 0; /* Assume, until we see it does. */
5827 current_function_returns_null = 0;
5828 current_function_returns_abnormally = 0;
5829 warn_about_return_type = 0;
5830 current_extern_inline = 0;
5831 c_switch_stack = NULL;
5833 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
5834 nstack_se->labels_def = NULL;
5835 nstack_se->labels_used = NULL;
5836 nstack_se->next = label_context_stack_se;
5837 label_context_stack_se = nstack_se;
5839 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
5840 nstack_vm->labels_def = NULL;
5841 nstack_vm->labels_used = NULL;
5842 nstack_vm->scope = 0;
5843 nstack_vm->next = label_context_stack_vm;
5844 label_context_stack_vm = nstack_vm;
5846 /* Indicate no valid break/continue context by setting these variables
5847 to some non-null, non-label value. We'll notice and emit the proper
5848 error message in c_finish_bc_stmt. */
5849 c_break_label = c_cont_label = size_zero_node;
5851 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5853 /* If the declarator is not suitable for a function definition,
5854 cause a syntax error. */
5857 label_context_stack_se = label_context_stack_se->next;
5858 label_context_stack_vm = label_context_stack_vm->next;
5862 decl_attributes (&decl1, attributes, 0);
5864 if (DECL_DECLARED_INLINE_P (decl1)
5865 && DECL_UNINLINABLE (decl1)
5866 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5867 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
5870 announce_function (decl1);
5872 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5874 error ("return type is an incomplete type");
5875 /* Make it return void instead. */
5877 = build_function_type (void_type_node,
5878 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5881 if (warn_about_return_type)
5882 pedwarn_c99 ("return type defaults to %<int%>");
5884 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5885 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5886 DECL_INITIAL (decl1) = error_mark_node;
5888 /* If this definition isn't a prototype and we had a prototype declaration
5889 before, copy the arg type info from that prototype. */
5890 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5891 current_function_prototype_locus = UNKNOWN_LOCATION;
5892 current_function_prototype_built_in = false;
5893 current_function_prototype_arg_types = NULL_TREE;
5894 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5896 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5897 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5898 TREE_TYPE (TREE_TYPE (old_decl))))
5900 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5902 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5903 current_function_prototype_built_in
5904 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
5905 current_function_prototype_arg_types
5906 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
5908 if (TREE_PUBLIC (decl1))
5910 /* If there is an external prototype declaration of this
5911 function, record its location but do not copy information
5912 to this decl. This may be an invisible declaration
5913 (built-in or in a scope which has finished) or simply
5914 have more refined argument types than any declaration
5916 struct c_binding *b;
5917 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
5918 if (B_IN_SCOPE (b, external_scope))
5922 tree ext_decl, ext_type;
5924 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
5925 if (TREE_CODE (ext_type) == FUNCTION_TYPE
5926 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5927 TREE_TYPE (ext_type)))
5929 current_function_prototype_locus
5930 = DECL_SOURCE_LOCATION (ext_decl);
5931 current_function_prototype_built_in
5932 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
5933 current_function_prototype_arg_types
5934 = TYPE_ARG_TYPES (ext_type);
5940 /* Optionally warn of old-fashioned def with no previous prototype. */
5941 if (warn_strict_prototypes
5942 && old_decl != error_mark_node
5943 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5944 && C_DECL_ISNT_PROTOTYPE (old_decl))
5945 warning (OPT_Wstrict_prototypes,
5946 "function declaration isn%'t a prototype");
5947 /* Optionally warn of any global def with no previous prototype. */
5948 else if (warn_missing_prototypes
5949 && old_decl != error_mark_node
5950 && TREE_PUBLIC (decl1)
5951 && !MAIN_NAME_P (DECL_NAME (decl1))
5952 && C_DECL_ISNT_PROTOTYPE (old_decl))
5953 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
5954 /* Optionally warn of any def with no previous prototype
5955 if the function has already been used. */
5956 else if (warn_missing_prototypes
5958 && old_decl != error_mark_node
5959 && TREE_USED (old_decl)
5960 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5961 warning (OPT_Wmissing_prototypes,
5962 "%q+D was used with no prototype before its definition", decl1);
5963 /* Optionally warn of any global def with no previous declaration. */
5964 else if (warn_missing_declarations
5965 && TREE_PUBLIC (decl1)
5967 && !MAIN_NAME_P (DECL_NAME (decl1)))
5968 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
5970 /* Optionally warn of any def with no previous declaration
5971 if the function has already been used. */
5972 else if (warn_missing_declarations
5974 && old_decl != error_mark_node
5975 && TREE_USED (old_decl)
5976 && C_DECL_IMPLICIT (old_decl))
5977 warning (OPT_Wmissing_declarations,
5978 "%q+D was used with no declaration before its definition", decl1);
5980 /* This is a definition, not a reference.
5981 So normally clear DECL_EXTERNAL.
5982 However, `extern inline' acts like a declaration
5983 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5984 DECL_EXTERNAL (decl1) = current_extern_inline;
5986 /* This function exists in static storage.
5987 (This does not mean `static' in the C sense!) */
5988 TREE_STATIC (decl1) = 1;
5990 /* A nested function is not global. */
5991 if (current_function_decl != 0)
5992 TREE_PUBLIC (decl1) = 0;
5994 /* This is the earliest point at which we might know the assembler
5995 name of the function. Thus, if it's set before this, die horribly. */
5996 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5998 /* If #pragma weak was used, mark the decl weak now. */
5999 if (current_scope == file_scope)
6000 maybe_apply_pragma_weak (decl1);
6002 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6003 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6008 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6009 != integer_type_node)
6010 pedwarn ("return type of %q+D is not %<int%>", decl1);
6012 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6013 args = TREE_CHAIN (args))
6015 tree type = args ? TREE_VALUE (args) : 0;
6017 if (type == void_type_node)
6024 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6025 pedwarn ("first argument of %q+D should be %<int%>", decl1);
6029 if (TREE_CODE (type) != POINTER_TYPE
6030 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6031 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6033 pedwarn ("second argument of %q+D should be %<char **%>",
6038 if (TREE_CODE (type) != POINTER_TYPE
6039 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6040 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6042 pedwarn ("third argument of %q+D should probably be "
6043 "%<char **%>", decl1);
6048 /* It is intentional that this message does not mention the third
6049 argument because it's only mentioned in an appendix of the
6051 if (argct > 0 && (argct < 2 || argct > 3))
6052 pedwarn ("%q+D takes only zero or two arguments", decl1);
6054 if (!TREE_PUBLIC (decl1))
6055 pedwarn ("%q+D is normally a non-static function", decl1);
6058 /* Record the decl so that the function name is defined.
6059 If we already have a decl for this name, and it is a FUNCTION_DECL,
6060 use the old decl. */
6062 current_function_decl = pushdecl (decl1);
6065 declare_parm_level ();
6067 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6068 /* Promote the value to int before returning it. */
6069 if (c_promoting_integer_type_p (restype))
6071 /* It retains unsignedness if not really getting wider. */
6072 if (TYPE_UNSIGNED (restype)
6073 && (TYPE_PRECISION (restype)
6074 == TYPE_PRECISION (integer_type_node)))
6075 restype = unsigned_type_node;
6077 restype = integer_type_node;
6080 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6081 DECL_ARTIFICIAL (resdecl) = 1;
6082 DECL_IGNORED_P (resdecl) = 1;
6083 DECL_RESULT (current_function_decl) = resdecl;
6085 start_fname_decls ();
6090 /* Subroutine of store_parm_decls which handles new-style function
6091 definitions (prototype format). The parms already have decls, so we
6092 need only record them as in effect and complain if any redundant
6093 old-style parm decls were written. */
6095 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6099 if (current_scope->bindings)
6101 error ("%Jold-style parameter declarations in prototyped "
6102 "function definition", fndecl);
6104 /* Get rid of the old-style declarations. */
6108 /* Don't issue this warning for nested functions, and don't issue this
6109 warning if we got here because ARG_INFO_TYPES was error_mark_node
6110 (this happens when a function definition has just an ellipsis in
6111 its parameter list). */
6112 else if (!in_system_header && !current_function_scope
6113 && arg_info->types != error_mark_node)
6114 warning (OPT_Wtraditional,
6115 "%Jtraditional C rejects ISO C style function definitions",
6118 /* Now make all the parameter declarations visible in the function body.
6119 We can bypass most of the grunt work of pushdecl. */
6120 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6122 DECL_CONTEXT (decl) = current_function_decl;
6123 if (DECL_NAME (decl))
6125 bind (DECL_NAME (decl), decl, current_scope,
6126 /*invisible=*/false, /*nested=*/false);
6127 if (!TREE_USED (decl))
6128 warn_if_shadowing (decl);
6131 error ("%Jparameter name omitted", decl);
6134 /* Record the parameter list in the function declaration. */
6135 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6137 /* Now make all the ancillary declarations visible, likewise. */
6138 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6140 DECL_CONTEXT (decl) = current_function_decl;
6141 if (DECL_NAME (decl))
6142 bind (DECL_NAME (decl), decl, current_scope,
6143 /*invisible=*/false, /*nested=*/false);
6146 /* And all the tag declarations. */
6147 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6148 if (TREE_PURPOSE (decl))
6149 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6150 /*invisible=*/false, /*nested=*/false);
6153 /* Subroutine of store_parm_decls which handles old-style function
6154 definitions (separate parameter list and declarations). */
6157 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6159 struct c_binding *b;
6160 tree parm, decl, last;
6161 tree parmids = arg_info->parms;
6162 struct pointer_set_t *seen_args = pointer_set_create ();
6164 if (!in_system_header)
6165 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6168 /* Match each formal parameter name with its declaration. Save each
6169 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6170 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6172 if (TREE_VALUE (parm) == 0)
6174 error ("%Jparameter name missing from parameter list", fndecl);
6175 TREE_PURPOSE (parm) = 0;
6179 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6180 if (b && B_IN_CURRENT_SCOPE (b))
6183 /* If we got something other than a PARM_DECL it is an error. */
6184 if (TREE_CODE (decl) != PARM_DECL)
6185 error ("%q+D declared as a non-parameter", decl);
6186 /* If the declaration is already marked, we have a duplicate
6187 name. Complain and ignore the duplicate. */
6188 else if (pointer_set_contains (seen_args, decl))
6190 error ("multiple parameters named %q+D", decl);
6191 TREE_PURPOSE (parm) = 0;
6194 /* If the declaration says "void", complain and turn it into
6196 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6198 error ("parameter %q+D declared with void type", decl);
6199 TREE_TYPE (decl) = integer_type_node;
6200 DECL_ARG_TYPE (decl) = integer_type_node;
6201 layout_decl (decl, 0);
6203 warn_if_shadowing (decl);
6205 /* If no declaration found, default to int. */
6208 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6209 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6210 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6212 warn_if_shadowing (decl);
6215 pedwarn ("type of %q+D defaults to %<int%>", decl);
6216 else if (extra_warnings)
6217 warning (OPT_Wextra, "type of %q+D defaults to %<int%>", decl);
6220 TREE_PURPOSE (parm) = decl;
6221 pointer_set_insert (seen_args, decl);
6224 /* Now examine the parms chain for incomplete declarations
6225 and declarations with no corresponding names. */
6227 for (b = current_scope->bindings; b; b = b->prev)
6230 if (TREE_CODE (parm) != PARM_DECL)
6233 if (TREE_TYPE (parm) != error_mark_node
6234 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6236 error ("parameter %q+D has incomplete type", parm);
6237 TREE_TYPE (parm) = error_mark_node;
6240 if (!pointer_set_contains (seen_args, parm))
6242 error ("declaration for parameter %q+D but no such parameter", parm);
6244 /* Pretend the parameter was not missing.
6245 This gets us to a standard state and minimizes
6246 further error messages. */
6247 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6251 /* Chain the declarations together in the order of the list of
6252 names. Store that chain in the function decl, replacing the
6253 list of names. Update the current scope to match. */
6254 DECL_ARGUMENTS (fndecl) = 0;
6256 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6257 if (TREE_PURPOSE (parm))
6259 if (parm && TREE_PURPOSE (parm))
6261 last = TREE_PURPOSE (parm);
6262 DECL_ARGUMENTS (fndecl) = last;
6264 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6265 if (TREE_PURPOSE (parm))
6267 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6268 last = TREE_PURPOSE (parm);
6270 TREE_CHAIN (last) = 0;
6273 pointer_set_destroy (seen_args);
6275 /* If there was a previous prototype,
6276 set the DECL_ARG_TYPE of each argument according to
6277 the type previously specified, and report any mismatches. */
6279 if (current_function_prototype_arg_types)
6282 for (parm = DECL_ARGUMENTS (fndecl),
6283 type = current_function_prototype_arg_types;
6284 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6285 != void_type_node));
6286 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6288 if (parm == 0 || type == 0
6289 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6291 if (current_function_prototype_built_in)
6292 warning (0, "number of arguments doesn%'t match "
6293 "built-in prototype");
6296 error ("number of arguments doesn%'t match prototype");
6297 error ("%Hprototype declaration",
6298 ¤t_function_prototype_locus);
6302 /* Type for passing arg must be consistent with that
6303 declared for the arg. ISO C says we take the unqualified
6304 type for parameters declared with qualified type. */
6305 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6306 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6308 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6309 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6311 /* Adjust argument to match prototype. E.g. a previous
6312 `int foo(float);' prototype causes
6313 `int foo(x) float x; {...}' to be treated like
6314 `int foo(float x) {...}'. This is particularly
6315 useful for argument types like uid_t. */
6316 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6318 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6319 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6320 && TYPE_PRECISION (TREE_TYPE (parm))
6321 < TYPE_PRECISION (integer_type_node))
6322 DECL_ARG_TYPE (parm) = integer_type_node;
6326 /* ??? Is it possible to get here with a
6327 built-in prototype or will it always have
6328 been diagnosed as conflicting with an
6329 old-style definition and discarded? */
6330 if (current_function_prototype_built_in)
6331 warning (0, "promoted argument %qD "
6332 "doesn%'t match built-in prototype", parm);
6335 pedwarn ("promoted argument %qD "
6336 "doesn%'t match prototype", parm);
6337 pedwarn ("%Hprototype declaration",
6338 ¤t_function_prototype_locus);
6344 if (current_function_prototype_built_in)
6345 warning (0, "argument %qD doesn%'t match "
6346 "built-in prototype", parm);
6349 error ("argument %qD doesn%'t match prototype", parm);
6350 error ("%Hprototype declaration",
6351 ¤t_function_prototype_locus);
6356 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6359 /* Otherwise, create a prototype that would match. */
6363 tree actual = 0, last = 0, type;
6365 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6367 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6369 TREE_CHAIN (last) = type;
6374 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6376 TREE_CHAIN (last) = type;
6380 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6381 of the type of this function, but we need to avoid having this
6382 affect the types of other similarly-typed functions, so we must
6383 first force the generation of an identical (but separate) type
6384 node for the relevant function type. The new node we create
6385 will be a variant of the main variant of the original function
6388 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6390 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6394 /* Store parameter declarations passed in ARG_INFO into the current
6395 function declaration. */
6398 store_parm_decls_from (struct c_arg_info *arg_info)
6400 current_function_arg_info = arg_info;
6401 store_parm_decls ();
6404 /* Store the parameter declarations into the current function declaration.
6405 This is called after parsing the parameter declarations, before
6406 digesting the body of the function.
6408 For an old-style definition, construct a prototype out of the old-style
6409 parameter declarations and inject it into the function's type. */
6412 store_parm_decls (void)
6414 tree fndecl = current_function_decl;
6417 /* The argument information block for FNDECL. */
6418 struct c_arg_info *arg_info = current_function_arg_info;
6419 current_function_arg_info = 0;
6421 /* True if this definition is written with a prototype. Note:
6422 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6423 list in a function definition as equivalent to (void) -- an
6424 empty argument list specifies the function has no parameters,
6425 but only (void) sets up a prototype for future calls. */
6426 proto = arg_info->types != 0;
6429 store_parm_decls_newstyle (fndecl, arg_info);
6431 store_parm_decls_oldstyle (fndecl, arg_info);
6433 /* The next call to push_scope will be a function body. */
6435 next_is_function_body = true;
6437 /* Write a record describing this function definition to the prototypes
6438 file (if requested). */
6440 gen_aux_info_record (fndecl, 1, 0, proto);
6442 /* Initialize the RTL code for the function. */
6443 allocate_struct_function (fndecl);
6445 /* Begin the statement tree for this function. */
6446 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6448 /* ??? Insert the contents of the pending sizes list into the function
6449 to be evaluated. The only reason left to have this is
6450 void foo(int n, int array[n++])
6451 because we throw away the array type in favor of a pointer type, and
6452 thus won't naturally see the SAVE_EXPR containing the increment. All
6453 other pending sizes would be handled by gimplify_parameters. */
6456 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6457 add_stmt (TREE_VALUE (t));
6460 /* Even though we're inside a function body, we still don't want to
6461 call expand_expr to calculate the size of a variable-sized array.
6462 We haven't necessarily assigned RTL to all variables yet, so it's
6463 not safe to try to expand expressions involving them. */
6464 cfun->x_dont_save_pending_sizes_p = 1;
6467 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6471 c_warn_unused_result_recursively (tree fndecl)
6473 struct cgraph_node *cgn;
6475 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6476 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6478 /* Finalize all nested functions now. */
6479 cgn = cgraph_node (fndecl);
6480 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6481 c_warn_unused_result_recursively (cgn->decl);
6484 /* Finish up a function declaration and compile that function
6485 all the way to assembler language output. The free the storage
6486 for the function definition.
6488 This is called after parsing the body of the function definition. */
6491 finish_function (void)
6493 tree fndecl = current_function_decl;
6495 label_context_stack_se = label_context_stack_se->next;
6496 label_context_stack_vm = label_context_stack_vm->next;
6498 if (TREE_CODE (fndecl) == FUNCTION_DECL
6499 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6501 tree args = DECL_ARGUMENTS (fndecl);
6502 for (; args; args = TREE_CHAIN (args))
6504 tree type = TREE_TYPE (args);
6505 if (INTEGRAL_TYPE_P (type)
6506 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6507 DECL_ARG_TYPE (args) = integer_type_node;
6511 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6512 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6514 /* Must mark the RESULT_DECL as being in this function. */
6516 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6517 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6519 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6521 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6522 != integer_type_node)
6524 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6525 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6527 pedwarn ("return type of %q+D is not %<int%>", fndecl);
6533 tree stmt = c_finish_return (integer_zero_node);
6534 #ifdef USE_MAPPED_LOCATION
6535 /* Hack. We don't want the middle-end to warn that this return
6536 is unreachable, so we mark its location as special. Using
6537 UNKNOWN_LOCATION has the problem that it gets clobbered in
6538 annotate_one_with_locus. A cleaner solution might be to
6539 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6541 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6543 /* Hack. We don't want the middle-end to warn that this
6544 return is unreachable, so put the statement on the
6546 annotate_with_file_line (stmt, input_filename, 0);
6552 /* Tie off the statement tree for this function. */
6553 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6555 finish_fname_decls ();
6557 /* Complain if there's just no return statement. */
6558 if (warn_return_type
6559 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6560 && !current_function_returns_value && !current_function_returns_null
6561 /* Don't complain if we are no-return. */
6562 && !current_function_returns_abnormally
6563 /* Don't warn for main(). */
6564 && !MAIN_NAME_P (DECL_NAME (fndecl))
6565 /* Or if they didn't actually specify a return type. */
6566 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6567 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6568 inline function, as we might never be compiled separately. */
6569 && DECL_INLINE (fndecl))
6571 warning (OPT_Wreturn_type,
6572 "no return statement in function returning non-void");
6573 TREE_NO_WARNING (fndecl) = 1;
6576 /* With just -Wextra, complain only if function returns both with
6577 and without a value. */
6579 && current_function_returns_value
6580 && current_function_returns_null)
6581 warning (OPT_Wextra, "this function may return with or without a value");
6583 /* Store the end of the function, so that we get good line number
6584 info for the epilogue. */
6585 cfun->function_end_locus = input_location;
6587 /* If we don't have ctors/dtors sections, and this is a static
6588 constructor or destructor, it must be recorded now. */
6589 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6590 && !targetm.have_ctors_dtors)
6591 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6592 if (DECL_STATIC_DESTRUCTOR (fndecl)
6593 && !targetm.have_ctors_dtors)
6594 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6596 /* Finalize the ELF visibility for the function. */
6597 c_determine_visibility (fndecl);
6599 /* Genericize before inlining. Delay genericizing nested functions
6600 until their parent function is genericized. Since finalizing
6601 requires GENERIC, delay that as well. */
6603 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6604 && !undef_nested_function)
6606 if (!decl_function_context (fndecl))
6608 c_genericize (fndecl);
6609 c_warn_unused_result_recursively (fndecl);
6611 /* ??? Objc emits functions after finalizing the compilation unit.
6612 This should be cleaned up later and this conditional removed. */
6613 if (cgraph_global_info_ready)
6615 c_expand_body (fndecl);
6619 cgraph_finalize_function (fndecl, false);
6623 /* Register this function with cgraph just far enough to get it
6624 added to our parent's nested function list. Handy, since the
6625 C front end doesn't have such a list. */
6626 (void) cgraph_node (fndecl);
6630 if (!decl_function_context (fndecl))
6631 undef_nested_function = false;
6633 /* We're leaving the context of this function, so zap cfun.
6634 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6635 tree_rest_of_compilation. */
6637 current_function_decl = NULL;
6640 /* Generate the RTL for the body of FNDECL. */
6643 c_expand_body (tree fndecl)
6646 if (!DECL_INITIAL (fndecl)
6647 || DECL_INITIAL (fndecl) == error_mark_node)
6650 tree_rest_of_compilation (fndecl);
6652 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6653 && targetm.have_ctors_dtors)
6654 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6655 DEFAULT_INIT_PRIORITY);
6656 if (DECL_STATIC_DESTRUCTOR (fndecl)
6657 && targetm.have_ctors_dtors)
6658 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6659 DEFAULT_INIT_PRIORITY);
6662 /* Check the declarations given in a for-loop for satisfying the C99
6665 check_for_loop_decls (void)
6667 struct c_binding *b;
6671 /* If we get here, declarations have been used in a for loop without
6672 the C99 for loop scope. This doesn't make much sense, so don't
6674 error ("%<for%> loop initial declaration used outside C99 mode");
6677 /* C99 subclause 6.8.5 paragraph 3:
6679 [#3] The declaration part of a for statement shall only
6680 declare identifiers for objects having storage class auto or
6683 It isn't clear whether, in this sentence, "identifiers" binds to
6684 "shall only declare" or to "objects" - that is, whether all identifiers
6685 declared must be identifiers for objects, or whether the restriction
6686 only applies to those that are. (A question on this in comp.std.c
6687 in November 2000 received no answer.) We implement the strictest
6688 interpretation, to avoid creating an extension which later causes
6691 for (b = current_scope->bindings; b; b = b->prev)
6694 tree decl = b->decl;
6699 switch (TREE_CODE (decl))
6702 if (TREE_STATIC (decl))
6703 error ("declaration of static variable %q+D in %<for%> loop "
6704 "initial declaration", decl);
6705 else if (DECL_EXTERNAL (decl))
6706 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6707 "initial declaration", decl);
6711 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6715 error ("%<union %E%> declared in %<for%> loop initial declaration",
6719 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6723 error ("declaration of non-variable %q+D in %<for%> loop "
6724 "initial declaration", decl);
6729 /* Save and reinitialize the variables
6730 used during compilation of a C function. */
6733 c_push_function_context (struct function *f)
6735 struct language_function *p;
6736 p = GGC_NEW (struct language_function);
6739 p->base.x_stmt_tree = c_stmt_tree;
6740 p->x_break_label = c_break_label;
6741 p->x_cont_label = c_cont_label;
6742 p->x_switch_stack = c_switch_stack;
6743 p->arg_info = current_function_arg_info;
6744 p->returns_value = current_function_returns_value;
6745 p->returns_null = current_function_returns_null;
6746 p->returns_abnormally = current_function_returns_abnormally;
6747 p->warn_about_return_type = warn_about_return_type;
6748 p->extern_inline = current_extern_inline;
6751 /* Restore the variables used during compilation of a C function. */
6754 c_pop_function_context (struct function *f)
6756 struct language_function *p = f->language;
6758 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6759 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6761 /* Stop pointing to the local nodes about to be freed. */
6762 /* But DECL_INITIAL must remain nonzero so we know this
6763 was an actual function definition. */
6764 DECL_INITIAL (current_function_decl) = error_mark_node;
6765 DECL_ARGUMENTS (current_function_decl) = 0;
6768 c_stmt_tree = p->base.x_stmt_tree;
6769 c_break_label = p->x_break_label;
6770 c_cont_label = p->x_cont_label;
6771 c_switch_stack = p->x_switch_stack;
6772 current_function_arg_info = p->arg_info;
6773 current_function_returns_value = p->returns_value;
6774 current_function_returns_null = p->returns_null;
6775 current_function_returns_abnormally = p->returns_abnormally;
6776 warn_about_return_type = p->warn_about_return_type;
6777 current_extern_inline = p->extern_inline;
6782 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6785 c_dup_lang_specific_decl (tree decl)
6787 struct lang_decl *ld;
6789 if (!DECL_LANG_SPECIFIC (decl))
6792 ld = GGC_NEW (struct lang_decl);
6793 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6794 DECL_LANG_SPECIFIC (decl) = ld;
6797 /* The functions below are required for functionality of doing
6798 function at once processing in the C front end. Currently these
6799 functions are not called from anywhere in the C front end, but as
6800 these changes continue, that will change. */
6802 /* Returns the stmt_tree (if any) to which statements are currently
6803 being added. If there is no active statement-tree, NULL is
6807 current_stmt_tree (void)
6809 return &c_stmt_tree;
6812 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6816 anon_aggr_type_p (tree ARG_UNUSED (node))
6821 /* Return the global value of T as a symbol. */
6824 identifier_global_value (tree t)
6826 struct c_binding *b;
6828 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6829 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6835 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6836 otherwise the name is found in ridpointers from RID_INDEX. */
6839 record_builtin_type (enum rid rid_index, const char *name, tree type)
6843 id = ridpointers[(int) rid_index];
6845 id = get_identifier (name);
6846 decl = build_decl (TYPE_DECL, id, type);
6848 if (debug_hooks->type_decl)
6849 debug_hooks->type_decl (decl, false);
6852 /* Build the void_list_node (void_type_node having been created). */
6854 build_void_list_node (void)
6856 tree t = build_tree_list (NULL_TREE, void_type_node);
6860 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6863 build_c_parm (struct c_declspecs *specs, tree attrs,
6864 struct c_declarator *declarator)
6866 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6869 ret->declarator = declarator;
6873 /* Return a declarator with nested attributes. TARGET is the inner
6874 declarator to which these attributes apply. ATTRS are the
6877 struct c_declarator *
6878 build_attrs_declarator (tree attrs, struct c_declarator *target)
6880 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6881 ret->kind = cdk_attrs;
6882 ret->declarator = target;
6883 ret->u.attrs = attrs;
6887 /* Return a declarator for a function with arguments specified by ARGS
6888 and return type specified by TARGET. */
6890 struct c_declarator *
6891 build_function_declarator (struct c_arg_info *args,
6892 struct c_declarator *target)
6894 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6895 ret->kind = cdk_function;
6896 ret->declarator = target;
6897 ret->u.arg_info = args;
6901 /* Return a declarator for the identifier IDENT (which may be
6902 NULL_TREE for an abstract declarator). */
6904 struct c_declarator *
6905 build_id_declarator (tree ident)
6907 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6909 ret->declarator = 0;
6911 /* Default value - may get reset to a more precise location. */
6912 ret->id_loc = input_location;
6916 /* Return something to represent absolute declarators containing a *.
6917 TARGET is the absolute declarator that the * contains.
6918 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6919 to apply to the pointer type. */
6921 struct c_declarator *
6922 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6923 struct c_declarator *target)
6927 struct c_declarator *itarget = target;
6928 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6929 if (type_quals_attrs)
6931 attrs = type_quals_attrs->attrs;
6932 quals = quals_from_declspecs (type_quals_attrs);
6933 if (attrs != NULL_TREE)
6934 itarget = build_attrs_declarator (attrs, target);
6936 ret->kind = cdk_pointer;
6937 ret->declarator = itarget;
6938 ret->u.pointer_quals = quals;
6942 /* Return a pointer to a structure for an empty list of declaration
6945 struct c_declspecs *
6946 build_null_declspecs (void)
6948 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6952 ret->typespec_word = cts_none;
6953 ret->storage_class = csc_none;
6954 ret->declspecs_seen_p = false;
6955 ret->type_seen_p = false;
6956 ret->non_sc_seen_p = false;
6957 ret->typedef_p = false;
6958 ret->tag_defined_p = false;
6959 ret->explicit_signed_p = false;
6960 ret->deprecated_p = false;
6961 ret->default_int_p = false;
6962 ret->long_p = false;
6963 ret->long_long_p = false;
6964 ret->short_p = false;
6965 ret->signed_p = false;
6966 ret->unsigned_p = false;
6967 ret->complex_p = false;
6968 ret->inline_p = false;
6969 ret->thread_p = false;
6970 ret->const_p = false;
6971 ret->volatile_p = false;
6972 ret->restrict_p = false;
6976 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6979 struct c_declspecs *
6980 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6984 specs->non_sc_seen_p = true;
6985 specs->declspecs_seen_p = true;
6986 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6987 && C_IS_RESERVED_WORD (qual));
6988 i = C_RID_CODE (qual);
6992 dupe = specs->const_p;
6993 specs->const_p = true;
6996 dupe = specs->volatile_p;
6997 specs->volatile_p = true;
7000 dupe = specs->restrict_p;
7001 specs->restrict_p = true;
7006 if (dupe && pedantic && !flag_isoc99)
7007 pedwarn ("duplicate %qE", qual);
7011 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7014 struct c_declspecs *
7015 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7017 tree type = spec.spec;
7018 specs->non_sc_seen_p = true;
7019 specs->declspecs_seen_p = true;
7020 specs->type_seen_p = true;
7021 if (TREE_DEPRECATED (type))
7022 specs->deprecated_p = true;
7024 /* Handle type specifier keywords. */
7025 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
7027 enum rid i = C_RID_CODE (type);
7030 error ("two or more data types in declaration specifiers");
7033 if ((int) i <= (int) RID_LAST_MODIFIER)
7035 /* "long", "short", "signed", "unsigned" or "_Complex". */
7040 if (specs->long_long_p)
7042 error ("%<long long long%> is too long for GCC");
7047 if (specs->typespec_word == cts_double)
7049 error ("both %<long long%> and %<double%> in "
7050 "declaration specifiers");
7053 if (pedantic && !flag_isoc99 && !in_system_header
7055 pedwarn ("ISO C90 does not support %<long long%>");
7056 specs->long_long_p = 1;
7060 error ("both %<long%> and %<short%> in "
7061 "declaration specifiers");
7062 else if (specs->typespec_word == cts_void)
7063 error ("both %<long%> and %<void%> in "
7064 "declaration specifiers");
7065 else if (specs->typespec_word == cts_bool)
7066 error ("both %<long%> and %<_Bool%> in "
7067 "declaration specifiers");
7068 else if (specs->typespec_word == cts_char)
7069 error ("both %<long%> and %<char%> in "
7070 "declaration specifiers");
7071 else if (specs->typespec_word == cts_float)
7072 error ("both %<long%> and %<float%> in "
7073 "declaration specifiers");
7075 specs->long_p = true;
7078 dupe = specs->short_p;
7080 error ("both %<long%> and %<short%> in "
7081 "declaration specifiers");
7082 else if (specs->typespec_word == cts_void)
7083 error ("both %<short%> and %<void%> in "
7084 "declaration specifiers");
7085 else if (specs->typespec_word == cts_bool)
7086 error ("both %<short%> and %<_Bool%> in "
7087 "declaration specifiers");
7088 else if (specs->typespec_word == cts_char)
7089 error ("both %<short%> and %<char%> in "
7090 "declaration specifiers");
7091 else if (specs->typespec_word == cts_float)
7092 error ("both %<short%> and %<float%> in "
7093 "declaration specifiers");
7094 else if (specs->typespec_word == cts_double)
7095 error ("both %<short%> and %<double%> in "
7096 "declaration specifiers");
7098 specs->short_p = true;
7101 dupe = specs->signed_p;
7102 if (specs->unsigned_p)
7103 error ("both %<signed%> and %<unsigned%> in "
7104 "declaration specifiers");
7105 else if (specs->typespec_word == cts_void)
7106 error ("both %<signed%> and %<void%> in "
7107 "declaration specifiers");
7108 else if (specs->typespec_word == cts_bool)
7109 error ("both %<signed%> and %<_Bool%> in "
7110 "declaration specifiers");
7111 else if (specs->typespec_word == cts_float)
7112 error ("both %<signed%> and %<float%> in "
7113 "declaration specifiers");
7114 else if (specs->typespec_word == cts_double)
7115 error ("both %<signed%> and %<double%> in "
7116 "declaration specifiers");
7118 specs->signed_p = true;
7121 dupe = specs->unsigned_p;
7122 if (specs->signed_p)
7123 error ("both %<signed%> and %<unsigned%> in "
7124 "declaration specifiers");
7125 else if (specs->typespec_word == cts_void)
7126 error ("both %<unsigned%> and %<void%> in "
7127 "declaration specifiers");
7128 else if (specs->typespec_word == cts_bool)
7129 error ("both %<unsigned%> and %<_Bool%> in "
7130 "declaration specifiers");
7131 else if (specs->typespec_word == cts_float)
7132 error ("both %<unsigned%> and %<float%> in "
7133 "declaration specifiers");
7134 else if (specs->typespec_word == cts_double)
7135 error ("both %<unsigned%> and %<double%> in "
7136 "declaration specifiers");
7138 specs->unsigned_p = true;
7141 dupe = specs->complex_p;
7142 if (pedantic && !flag_isoc99 && !in_system_header)
7143 pedwarn ("ISO C90 does not support complex types");
7144 if (specs->typespec_word == cts_void)
7145 error ("both %<complex%> and %<void%> in "
7146 "declaration specifiers");
7147 else if (specs->typespec_word == cts_bool)
7148 error ("both %<complex%> and %<_Bool%> in "
7149 "declaration specifiers");
7151 specs->complex_p = true;
7158 error ("duplicate %qE", type);
7164 /* "void", "_Bool", "char", "int", "float" or "double". */
7165 if (specs->typespec_word != cts_none)
7167 error ("two or more data types in declaration specifiers");
7174 error ("both %<long%> and %<void%> in "
7175 "declaration specifiers");
7176 else if (specs->short_p)
7177 error ("both %<short%> and %<void%> in "
7178 "declaration specifiers");
7179 else if (specs->signed_p)
7180 error ("both %<signed%> and %<void%> in "
7181 "declaration specifiers");
7182 else if (specs->unsigned_p)
7183 error ("both %<unsigned%> and %<void%> in "
7184 "declaration specifiers");
7185 else if (specs->complex_p)
7186 error ("both %<complex%> and %<void%> in "
7187 "declaration specifiers");
7189 specs->typespec_word = cts_void;
7193 error ("both %<long%> and %<_Bool%> in "
7194 "declaration specifiers");
7195 else if (specs->short_p)
7196 error ("both %<short%> and %<_Bool%> in "
7197 "declaration specifiers");
7198 else if (specs->signed_p)
7199 error ("both %<signed%> and %<_Bool%> in "
7200 "declaration specifiers");
7201 else if (specs->unsigned_p)
7202 error ("both %<unsigned%> and %<_Bool%> in "
7203 "declaration specifiers");
7204 else if (specs->complex_p)
7205 error ("both %<complex%> and %<_Bool%> in "
7206 "declaration specifiers");
7208 specs->typespec_word = cts_bool;
7212 error ("both %<long%> and %<char%> in "
7213 "declaration specifiers");
7214 else if (specs->short_p)
7215 error ("both %<short%> and %<char%> in "
7216 "declaration specifiers");
7218 specs->typespec_word = cts_char;
7221 specs->typespec_word = cts_int;
7225 error ("both %<long%> and %<float%> in "
7226 "declaration specifiers");
7227 else if (specs->short_p)
7228 error ("both %<short%> and %<float%> in "
7229 "declaration specifiers");
7230 else if (specs->signed_p)
7231 error ("both %<signed%> and %<float%> in "
7232 "declaration specifiers");
7233 else if (specs->unsigned_p)
7234 error ("both %<unsigned%> and %<float%> in "
7235 "declaration specifiers");
7237 specs->typespec_word = cts_float;
7240 if (specs->long_long_p)
7241 error ("both %<long long%> and %<double%> in "
7242 "declaration specifiers");
7243 else if (specs->short_p)
7244 error ("both %<short%> and %<double%> in "
7245 "declaration specifiers");
7246 else if (specs->signed_p)
7247 error ("both %<signed%> and %<double%> in "
7248 "declaration specifiers");
7249 else if (specs->unsigned_p)
7250 error ("both %<unsigned%> and %<double%> in "
7251 "declaration specifiers");
7253 specs->typespec_word = cts_double;
7256 /* ObjC reserved word "id", handled below. */
7262 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7263 form of ObjC type, cases such as "int" and "long" being handled
7264 above), a TYPE (struct, union, enum and typeof specifiers) or an
7265 ERROR_MARK. In none of these cases may there have previously
7266 been any type specifiers. */
7267 if (specs->type || specs->typespec_word != cts_none
7268 || specs->long_p || specs->short_p || specs->signed_p
7269 || specs->unsigned_p || specs->complex_p)
7270 error ("two or more data types in declaration specifiers");
7271 else if (TREE_CODE (type) == TYPE_DECL)
7273 if (TREE_TYPE (type) == error_mark_node)
7274 ; /* Allow the type to default to int to avoid cascading errors. */
7277 specs->type = TREE_TYPE (type);
7278 specs->decl_attr = DECL_ATTRIBUTES (type);
7279 specs->typedef_p = true;
7280 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7283 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7285 tree t = lookup_name (type);
7286 if (!t || TREE_CODE (t) != TYPE_DECL)
7287 error ("%qE fails to be a typedef or built in type", type);
7288 else if (TREE_TYPE (t) == error_mark_node)
7291 specs->type = TREE_TYPE (t);
7293 else if (TREE_CODE (type) != ERROR_MARK)
7295 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7296 specs->tag_defined_p = true;
7297 if (spec.kind == ctsk_typeof)
7298 specs->typedef_p = true;
7305 /* Add the storage class specifier or function specifier SCSPEC to the
7306 declaration specifiers SPECS, returning SPECS. */
7308 struct c_declspecs *
7309 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7312 enum c_storage_class n = csc_none;
7314 specs->declspecs_seen_p = true;
7315 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7316 && C_IS_RESERVED_WORD (scspec));
7317 i = C_RID_CODE (scspec);
7318 if (extra_warnings && specs->non_sc_seen_p)
7319 warning (OPT_Wextra, "%qE is not at beginning of declaration", scspec);
7323 /* C99 permits duplicate inline. Although of doubtful utility,
7324 it seems simplest to permit it in gnu89 mode as well, as
7325 there is also little utility in maintaining this as a
7326 difference between gnu89 and C99 inline. */
7328 specs->inline_p = true;
7331 dupe = specs->thread_p;
7332 if (specs->storage_class == csc_auto)
7333 error ("%<__thread%> used with %<auto%>");
7334 else if (specs->storage_class == csc_register)
7335 error ("%<__thread%> used with %<register%>");
7336 else if (specs->storage_class == csc_typedef)
7337 error ("%<__thread%> used with %<typedef%>");
7339 specs->thread_p = true;
7346 /* Diagnose "__thread extern". */
7347 if (specs->thread_p)
7348 error ("%<__thread%> before %<extern%>");
7355 /* Diagnose "__thread static". */
7356 if (specs->thread_p)
7357 error ("%<__thread%> before %<static%>");
7365 if (n != csc_none && n == specs->storage_class)
7368 error ("duplicate %qE", scspec);
7371 if (specs->storage_class != csc_none && n != specs->storage_class)
7373 error ("multiple storage classes in declaration specifiers");
7377 specs->storage_class = n;
7378 if (n != csc_extern && n != csc_static && specs->thread_p)
7380 error ("%<__thread%> used with %qE", scspec);
7381 specs->thread_p = false;
7388 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7391 struct c_declspecs *
7392 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7394 specs->attrs = chainon (attrs, specs->attrs);
7395 specs->declspecs_seen_p = true;
7399 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7400 specifiers with any other type specifier to determine the resulting
7401 type. This is where ISO C checks on complex types are made, since
7402 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7405 struct c_declspecs *
7406 finish_declspecs (struct c_declspecs *specs)
7408 /* If a type was specified as a whole, we have no modifiers and are
7410 if (specs->type != NULL_TREE)
7412 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7413 && !specs->signed_p && !specs->unsigned_p
7414 && !specs->complex_p);
7418 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7419 has been specified, treat it as "int" unless "_Complex" is
7420 present and there are no other specifiers. If we just have
7421 "_Complex", it is equivalent to "_Complex double", but e.g.
7422 "_Complex short" is equivalent to "_Complex short int". */
7423 if (specs->typespec_word == cts_none)
7425 if (specs->long_p || specs->short_p
7426 || specs->signed_p || specs->unsigned_p)
7428 specs->typespec_word = cts_int;
7430 else if (specs->complex_p)
7432 specs->typespec_word = cts_double;
7434 pedwarn ("ISO C does not support plain %<complex%> meaning "
7435 "%<double complex%>");
7439 specs->typespec_word = cts_int;
7440 specs->default_int_p = true;
7441 /* We don't diagnose this here because grokdeclarator will
7442 give more specific diagnostics according to whether it is
7443 a function definition. */
7447 /* If "signed" was specified, record this to distinguish "int" and
7448 "signed int" in the case of a bit-field with
7449 -funsigned-bitfields. */
7450 specs->explicit_signed_p = specs->signed_p;
7452 /* Now compute the actual type. */
7453 switch (specs->typespec_word)
7456 gcc_assert (!specs->long_p && !specs->short_p
7457 && !specs->signed_p && !specs->unsigned_p
7458 && !specs->complex_p);
7459 specs->type = void_type_node;
7462 gcc_assert (!specs->long_p && !specs->short_p
7463 && !specs->signed_p && !specs->unsigned_p
7464 && !specs->complex_p);
7465 specs->type = boolean_type_node;
7468 gcc_assert (!specs->long_p && !specs->short_p);
7469 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7470 if (specs->signed_p)
7471 specs->type = signed_char_type_node;
7472 else if (specs->unsigned_p)
7473 specs->type = unsigned_char_type_node;
7475 specs->type = char_type_node;
7476 if (specs->complex_p)
7479 pedwarn ("ISO C does not support complex integer types");
7480 specs->type = build_complex_type (specs->type);
7484 gcc_assert (!(specs->long_p && specs->short_p));
7485 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7486 if (specs->long_long_p)
7487 specs->type = (specs->unsigned_p
7488 ? long_long_unsigned_type_node
7489 : long_long_integer_type_node);
7490 else if (specs->long_p)
7491 specs->type = (specs->unsigned_p
7492 ? long_unsigned_type_node
7493 : long_integer_type_node);
7494 else if (specs->short_p)
7495 specs->type = (specs->unsigned_p
7496 ? short_unsigned_type_node
7497 : short_integer_type_node);
7499 specs->type = (specs->unsigned_p
7500 ? unsigned_type_node
7501 : integer_type_node);
7502 if (specs->complex_p)
7505 pedwarn ("ISO C does not support complex integer types");
7506 specs->type = build_complex_type (specs->type);
7510 gcc_assert (!specs->long_p && !specs->short_p
7511 && !specs->signed_p && !specs->unsigned_p);
7512 specs->type = (specs->complex_p
7513 ? complex_float_type_node
7517 gcc_assert (!specs->long_long_p && !specs->short_p
7518 && !specs->signed_p && !specs->unsigned_p);
7521 specs->type = (specs->complex_p
7522 ? complex_long_double_type_node
7523 : long_double_type_node);
7527 specs->type = (specs->complex_p
7528 ? complex_double_type_node
7529 : double_type_node);
7539 /* Synthesize a function which calls all the global ctors or global
7540 dtors in this file. This is only used for targets which do not
7541 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7543 build_cdtor (int method_type, tree cdtors)
7550 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7551 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7554 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7557 /* A subroutine of c_write_global_declarations. Perform final processing
7558 on one file scope's declarations (or the external scope's declarations),
7562 c_write_global_declarations_1 (tree globals)
7567 /* Process the decls in the order they were written. */
7568 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7570 /* Check for used but undefined static functions using the C
7571 standard's definition of "used", and set TREE_NO_WARNING so
7572 that check_global_declarations doesn't repeat the check. */
7573 if (TREE_CODE (decl) == FUNCTION_DECL
7574 && DECL_INITIAL (decl) == 0
7575 && DECL_EXTERNAL (decl)
7576 && !TREE_PUBLIC (decl)
7577 && C_DECL_USED (decl))
7579 pedwarn ("%q+F used but never defined", decl);
7580 TREE_NO_WARNING (decl) = 1;
7583 wrapup_global_declaration_1 (decl);
7589 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7590 reconsider |= wrapup_global_declaration_2 (decl);
7594 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7595 check_global_declaration_1 (decl);
7598 /* A subroutine of c_write_global_declarations Emit debug information for each
7599 of the declarations in GLOBALS. */
7602 c_write_global_declarations_2 (tree globals)
7606 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
7607 debug_hooks->global_decl (decl);
7610 /* Preserve the external declarations scope across a garbage collect. */
7611 static GTY(()) tree ext_block;
7614 c_write_global_declarations (void)
7618 /* We don't want to do this if generating a PCH. */
7622 /* Don't waste time on further processing if -fsyntax-only or we've
7623 encountered errors. */
7624 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7627 /* Close the external scope. */
7628 ext_block = pop_scope ();
7630 gcc_assert (!current_scope);
7634 tree tmp = BLOCK_VARS (ext_block);
7636 FILE * stream = dump_begin (TDI_tu, &flags);
7639 dump_node (tmp, flags & ~TDF_SLIM, stream);
7640 dump_end (TDI_tu, stream);
7644 /* Process all file scopes in this compilation, and the external_scope,
7645 through wrapup_global_declarations and check_global_declarations. */
7646 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7647 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7648 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7650 /* Generate functions to call static constructors and destructors
7651 for targets that do not support .ctors/.dtors sections. These
7652 functions have magic names which are detected by collect2. */
7653 build_cdtor ('I', static_ctors); static_ctors = 0;
7654 build_cdtor ('D', static_dtors); static_dtors = 0;
7656 /* We're done parsing; proceed to optimize and emit assembly.
7657 FIXME: shouldn't be the front end's responsibility to call this. */
7660 /* After cgraph has had a chance to emit everything that's going to
7661 be emitted, output debug information for globals. */
7662 if (errorcount == 0 && sorrycount == 0)
7664 timevar_push (TV_SYMOUT);
7665 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7666 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
7667 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
7668 timevar_pop (TV_SYMOUT);
7674 #include "gt-c-decl.h"