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' but look only at the indicated scope. */
2677 lookup_name_in_scope (tree name, struct c_scope *scope)
2679 struct c_binding *b;
2681 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2682 if (B_IN_SCOPE (b, scope))
2687 /* Create the predefined scalar types of C,
2688 and some nodes representing standard constants (0, 1, (void *) 0).
2689 Initialize the global scope.
2690 Make definitions for built-in primitive functions. */
2693 c_init_decl_processing (void)
2695 location_t save_loc = input_location;
2697 /* Initialize reserved words for parser. */
2700 current_function_decl = 0;
2702 gcc_obstack_init (&parser_obstack);
2704 /* Make the externals scope. */
2706 external_scope = current_scope;
2708 /* Declarations from c_common_nodes_and_builtins must not be associated
2709 with this input file, lest we get differences between using and not
2710 using preprocessed headers. */
2711 #ifdef USE_MAPPED_LOCATION
2712 input_location = BUILTINS_LOCATION;
2714 input_location.file = "<built-in>";
2715 input_location.line = 0;
2718 build_common_tree_nodes (flag_signed_char, false);
2720 c_common_nodes_and_builtins ();
2722 /* In C, comparisons and TRUTH_* expressions have type int. */
2723 truthvalue_type_node = integer_type_node;
2724 truthvalue_true_node = integer_one_node;
2725 truthvalue_false_node = integer_zero_node;
2727 /* Even in C99, which has a real boolean type. */
2728 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2729 boolean_type_node));
2731 input_location = save_loc;
2733 pedantic_lvalues = true;
2735 make_fname_decl = c_make_fname_decl;
2736 start_fname_decls ();
2739 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2740 decl, NAME is the initialization string and TYPE_DEP indicates whether
2741 NAME depended on the type of the function. As we don't yet implement
2742 delayed emission of static data, we mark the decl as emitted
2743 so it is not placed in the output. Anything using it must therefore pull
2744 out the STRING_CST initializer directly. FIXME. */
2747 c_make_fname_decl (tree id, int type_dep)
2749 const char *name = fname_as_string (type_dep);
2750 tree decl, type, init;
2751 size_t length = strlen (name);
2753 type = build_array_type (char_type_node,
2754 build_index_type (size_int (length)));
2755 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2757 decl = build_decl (VAR_DECL, id, type);
2759 TREE_STATIC (decl) = 1;
2760 TREE_READONLY (decl) = 1;
2761 DECL_ARTIFICIAL (decl) = 1;
2763 init = build_string (length + 1, name);
2764 free ((char *) name);
2765 TREE_TYPE (init) = type;
2766 DECL_INITIAL (decl) = init;
2768 TREE_USED (decl) = 1;
2770 if (current_function_decl)
2772 DECL_CONTEXT (decl) = current_function_decl;
2773 bind (id, decl, current_function_scope,
2774 /*invisible=*/false, /*nested=*/false);
2777 finish_decl (decl, init, NULL_TREE);
2782 /* Return a definition for a builtin function named NAME and whose data type
2783 is TYPE. TYPE should be a function type with argument types.
2784 FUNCTION_CODE tells later passes how to compile calls to this function.
2785 See tree.h for its possible values.
2787 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2788 the name to be called if we can't opencode the function. If
2789 ATTRS is nonzero, use that for the function's attribute list. */
2792 builtin_function (const char *name, tree type, int function_code,
2793 enum built_in_class cl, const char *library_name,
2796 tree id = get_identifier (name);
2797 tree decl = build_decl (FUNCTION_DECL, id, type);
2798 TREE_PUBLIC (decl) = 1;
2799 DECL_EXTERNAL (decl) = 1;
2800 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2801 DECL_BUILT_IN_CLASS (decl) = cl;
2802 DECL_FUNCTION_CODE (decl) = function_code;
2803 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2805 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2807 /* Should never be called on a symbol with a preexisting meaning. */
2808 gcc_assert (!I_SYMBOL_BINDING (id));
2810 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2812 /* Builtins in the implementation namespace are made visible without
2813 needing to be explicitly declared. See push_file_scope. */
2814 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2816 TREE_CHAIN (decl) = visible_builtins;
2817 visible_builtins = decl;
2820 /* Possibly apply some default attributes to this built-in function. */
2822 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2824 decl_attributes (&decl, NULL_TREE, 0);
2829 /* Called when a declaration is seen that contains no names to declare.
2830 If its type is a reference to a structure, union or enum inherited
2831 from a containing scope, shadow that tag name for the current scope
2832 with a forward reference.
2833 If its type defines a new named structure or union
2834 or defines an enum, it is valid but we need not do anything here.
2835 Otherwise, it is an error. */
2838 shadow_tag (const struct c_declspecs *declspecs)
2840 shadow_tag_warned (declspecs, 0);
2843 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2846 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2848 bool found_tag = false;
2850 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2852 tree value = declspecs->type;
2853 enum tree_code code = TREE_CODE (value);
2855 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2856 /* Used to test also that TYPE_SIZE (value) != 0.
2857 That caused warning for `struct foo;' at top level in the file. */
2859 tree name = TYPE_NAME (value);
2866 if (warned != 1 && code != ENUMERAL_TYPE)
2867 /* Empty unnamed enum OK */
2869 pedwarn ("unnamed struct/union that defines no instances");
2873 else if (!declspecs->tag_defined_p
2874 && declspecs->storage_class != csc_none)
2877 pedwarn ("empty declaration with storage class specifier "
2878 "does not redeclare tag");
2880 pending_xref_error ();
2882 else if (!declspecs->tag_defined_p
2883 && (declspecs->const_p
2884 || declspecs->volatile_p
2885 || declspecs->restrict_p))
2888 pedwarn ("empty declaration with type qualifier "
2889 "does not redeclare tag");
2891 pending_xref_error ();
2895 pending_invalid_xref = 0;
2896 t = lookup_tag (code, name, 1);
2900 t = make_node (code);
2907 if (warned != 1 && !in_system_header)
2909 pedwarn ("useless type name in empty declaration");
2914 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2916 pedwarn ("useless type name in empty declaration");
2920 pending_invalid_xref = 0;
2922 if (declspecs->inline_p)
2924 error ("%<inline%> in empty declaration");
2928 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2930 error ("%<auto%> in file-scope empty declaration");
2934 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2936 error ("%<register%> in file-scope empty declaration");
2940 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2942 warning (0, "useless storage class specifier in empty declaration");
2946 if (!warned && !in_system_header && declspecs->thread_p)
2948 warning (0, "useless %<__thread%> in empty declaration");
2952 if (!warned && !in_system_header && (declspecs->const_p
2953 || declspecs->volatile_p
2954 || declspecs->restrict_p))
2956 warning (0, "useless type qualifier in empty declaration");
2963 pedwarn ("empty declaration");
2968 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2969 bits. SPECS represents declaration specifiers that the grammar
2970 only permits to contain type qualifiers and attributes. */
2973 quals_from_declspecs (const struct c_declspecs *specs)
2975 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2976 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2977 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2978 gcc_assert (!specs->type
2979 && !specs->decl_attr
2980 && specs->typespec_word == cts_none
2981 && specs->storage_class == csc_none
2982 && !specs->typedef_p
2983 && !specs->explicit_signed_p
2984 && !specs->deprecated_p
2986 && !specs->long_long_p
2989 && !specs->unsigned_p
2990 && !specs->complex_p
2992 && !specs->thread_p);
2996 /* Construct an array declarator. EXPR is the expression inside [], or
2997 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2998 to the pointer to which a parameter array is converted). STATIC_P is
2999 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
3000 is true if the array is [*], a VLA of unspecified length which is
3001 nevertheless a complete type (not currently implemented by GCC),
3002 false otherwise. The field for the contained declarator is left to be
3003 filled in by set_array_declarator_inner. */
3005 struct c_declarator *
3006 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3009 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3010 struct c_declarator);
3011 declarator->kind = cdk_array;
3012 declarator->declarator = 0;
3013 declarator->u.array.dimen = expr;
3016 declarator->u.array.attrs = quals->attrs;
3017 declarator->u.array.quals = quals_from_declspecs (quals);
3021 declarator->u.array.attrs = NULL_TREE;
3022 declarator->u.array.quals = 0;
3024 declarator->u.array.static_p = static_p;
3025 declarator->u.array.vla_unspec_p = vla_unspec_p;
3026 if (pedantic && !flag_isoc99)
3028 if (static_p || quals != NULL)
3029 pedwarn ("ISO C90 does not support %<static%> or type "
3030 "qualifiers in parameter array declarators");
3032 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3035 warning (0, "GCC does not yet properly implement %<[*]%> array declarators");
3039 /* Set the contained declarator of an array declarator. DECL is the
3040 declarator, as constructed by build_array_declarator; INNER is what
3041 appears on the left of the []. ABSTRACT_P is true if it is an
3042 abstract declarator, false otherwise; this is used to reject static
3043 and type qualifiers in abstract declarators, where they are not in
3044 the C99 grammar (subject to possible change in DR#289). */
3046 struct c_declarator *
3047 set_array_declarator_inner (struct c_declarator *decl,
3048 struct c_declarator *inner, bool abstract_p)
3050 decl->declarator = inner;
3051 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
3052 || decl->u.array.attrs != NULL_TREE
3053 || decl->u.array.static_p))
3054 error ("static or type qualifiers in abstract declarator");
3058 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3061 groktypename (struct c_type_name *type_name)
3064 tree attrs = type_name->specs->attrs;
3066 type_name->specs->attrs = NULL_TREE;
3068 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3071 /* Apply attributes. */
3072 decl_attributes (&type, attrs, 0);
3077 /* Decode a declarator in an ordinary declaration or data definition.
3078 This is called as soon as the type information and variable name
3079 have been parsed, before parsing the initializer if any.
3080 Here we create the ..._DECL node, fill in its type,
3081 and put it on the list of decls for the current context.
3082 The ..._DECL node is returned as the value.
3084 Exception: for arrays where the length is not specified,
3085 the type is left null, to be filled in by `finish_decl'.
3087 Function definitions do not come here; they go to start_function
3088 instead. However, external and forward declarations of functions
3089 do go through here. Structure field declarations are done by
3090 grokfield and not through here. */
3093 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3094 bool initialized, tree attributes)
3099 /* An object declared as __attribute__((deprecated)) suppresses
3100 warnings of uses of other deprecated items. */
3101 if (lookup_attribute ("deprecated", attributes))
3102 deprecated_state = DEPRECATED_SUPPRESS;
3104 decl = grokdeclarator (declarator, declspecs,
3105 NORMAL, initialized, NULL);
3109 deprecated_state = DEPRECATED_NORMAL;
3111 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3112 && MAIN_NAME_P (DECL_NAME (decl)))
3113 warning (OPT_Wmain, "%q+D is usually a function", decl);
3116 /* Is it valid for this decl to have an initializer at all?
3117 If not, set INITIALIZED to zero, which will indirectly
3118 tell 'finish_decl' to ignore the initializer once it is parsed. */
3119 switch (TREE_CODE (decl))
3122 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3127 error ("function %qD is initialized like a variable", decl);
3132 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3133 error ("parameter %qD is initialized", decl);
3138 /* Don't allow initializations for incomplete types except for
3139 arrays which might be completed by the initialization. */
3141 /* This can happen if the array size is an undefined macro.
3142 We already gave a warning, so we don't need another one. */
3143 if (TREE_TYPE (decl) == error_mark_node)
3145 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3147 /* A complete type is ok if size is fixed. */
3149 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3150 || C_DECL_VARIABLE_SIZE (decl))
3152 error ("variable-sized object may not be initialized");
3156 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3158 error ("variable %qD has initializer but incomplete type", decl);
3161 else if (C_DECL_VARIABLE_SIZE (decl))
3163 /* Although C99 is unclear about whether incomplete arrays
3164 of VLAs themselves count as VLAs, it does not make
3165 sense to permit them to be initialized given that
3166 ordinary VLAs may not be initialized. */
3167 error ("variable-sized object may not be initialized");
3174 if (current_scope == file_scope)
3175 TREE_STATIC (decl) = 1;
3177 /* Tell 'pushdecl' this is an initialized decl
3178 even though we don't yet have the initializer expression.
3179 Also tell 'finish_decl' it may store the real initializer. */
3180 DECL_INITIAL (decl) = error_mark_node;
3183 /* If this is a function declaration, write a record describing it to the
3184 prototypes file (if requested). */
3186 if (TREE_CODE (decl) == FUNCTION_DECL)
3187 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3189 /* ANSI specifies that a tentative definition which is not merged with
3190 a non-tentative definition behaves exactly like a definition with an
3191 initializer equal to zero. (Section 3.7.2)
3193 -fno-common gives strict ANSI behavior, though this tends to break
3194 a large body of code that grew up without this rule.
3196 Thread-local variables are never common, since there's no entrenched
3197 body of code to break, and it allows more efficient variable references
3198 in the presence of dynamic linking. */
3200 if (TREE_CODE (decl) == VAR_DECL
3202 && TREE_PUBLIC (decl)
3203 && !DECL_THREAD_LOCAL_P (decl)
3205 DECL_COMMON (decl) = 1;
3207 /* Set attributes here so if duplicate decl, will have proper attributes. */
3208 decl_attributes (&decl, attributes, 0);
3210 if (TREE_CODE (decl) == FUNCTION_DECL
3211 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3213 struct c_declarator *ce = declarator;
3215 if (ce->kind == cdk_pointer)
3216 ce = declarator->declarator;
3217 if (ce->kind == cdk_function)
3219 tree args = ce->u.arg_info->parms;
3220 for (; args; args = TREE_CHAIN (args))
3222 tree type = TREE_TYPE (args);
3223 if (type && INTEGRAL_TYPE_P (type)
3224 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3225 DECL_ARG_TYPE (args) = integer_type_node;
3230 if (TREE_CODE (decl) == FUNCTION_DECL
3231 && DECL_DECLARED_INLINE_P (decl)
3232 && DECL_UNINLINABLE (decl)
3233 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3234 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3237 /* Add this decl to the current scope.
3238 TEM may equal DECL or it may be a previous decl of the same name. */
3239 tem = pushdecl (decl);
3241 if (initialized && DECL_EXTERNAL (tem))
3243 DECL_EXTERNAL (tem) = 0;
3244 TREE_STATIC (tem) = 1;
3250 /* Finish processing of a declaration;
3251 install its initial value.
3252 If the length of an array type is not known before,
3253 it must be determined now, from the initial value, or it is an error. */
3256 finish_decl (tree decl, tree init, tree asmspec_tree)
3258 tree type = TREE_TYPE (decl);
3259 int was_incomplete = (DECL_SIZE (decl) == 0);
3260 const char *asmspec = 0;
3262 /* If a name was specified, get the string. */
3263 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3264 && DECL_FILE_SCOPE_P (decl))
3265 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3267 asmspec = TREE_STRING_POINTER (asmspec_tree);
3269 /* If `start_decl' didn't like having an initialization, ignore it now. */
3270 if (init != 0 && DECL_INITIAL (decl) == 0)
3273 /* Don't crash if parm is initialized. */
3274 if (TREE_CODE (decl) == PARM_DECL)
3278 store_init_value (decl, init);
3280 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3281 || TREE_CODE (decl) == FUNCTION_DECL
3282 || TREE_CODE (decl) == FIELD_DECL))
3283 objc_check_decl (decl);
3285 /* Deduce size of array from initialization, if not already known. */
3286 if (TREE_CODE (type) == ARRAY_TYPE
3287 && TYPE_DOMAIN (type) == 0
3288 && TREE_CODE (decl) != TYPE_DECL)
3291 = (TREE_STATIC (decl)
3292 /* Even if pedantic, an external linkage array
3293 may have incomplete type at first. */
3294 ? pedantic && !TREE_PUBLIC (decl)
3295 : !DECL_EXTERNAL (decl));
3297 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3300 /* Get the completed type made by complete_array_type. */
3301 type = TREE_TYPE (decl);
3306 error ("initializer fails to determine size of %q+D", decl);
3311 error ("array size missing in %q+D", decl);
3312 /* If a `static' var's size isn't known,
3313 make it extern as well as static, so it does not get
3315 If it is not `static', then do not mark extern;
3316 finish_incomplete_decl will give it a default size
3317 and it will get allocated. */
3318 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3319 DECL_EXTERNAL (decl) = 1;
3323 error ("zero or negative size array %q+D", decl);
3327 /* For global variables, update the copy of the type that
3328 exists in the binding. */
3329 if (TREE_PUBLIC (decl))
3331 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3332 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3333 b_ext = b_ext->shadowed;
3337 b_ext->type = composite_type (b_ext->type, type);
3348 if (DECL_INITIAL (decl))
3349 TREE_TYPE (DECL_INITIAL (decl)) = type;
3351 layout_decl (decl, 0);
3354 if (TREE_CODE (decl) == VAR_DECL)
3356 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3357 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3358 layout_decl (decl, 0);
3360 if (DECL_SIZE (decl) == 0
3361 /* Don't give an error if we already gave one earlier. */
3362 && TREE_TYPE (decl) != error_mark_node
3363 && (TREE_STATIC (decl)
3364 /* A static variable with an incomplete type
3365 is an error if it is initialized.
3366 Also if it is not file scope.
3367 Otherwise, let it through, but if it is not `extern'
3368 then it may cause an error message later. */
3369 ? (DECL_INITIAL (decl) != 0
3370 || !DECL_FILE_SCOPE_P (decl))
3371 /* An automatic variable with an incomplete type
3373 : !DECL_EXTERNAL (decl)))
3375 error ("storage size of %q+D isn%'t known", decl);
3376 TREE_TYPE (decl) = error_mark_node;
3379 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3380 && DECL_SIZE (decl) != 0)
3382 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3383 constant_expression_warning (DECL_SIZE (decl));
3385 error ("storage size of %q+D isn%'t constant", decl);
3388 if (TREE_USED (type))
3389 TREE_USED (decl) = 1;
3392 /* If this is a function and an assembler name is specified, reset DECL_RTL
3393 so we can give it its new name. Also, update built_in_decls if it
3394 was a normal built-in. */
3395 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3397 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3398 set_builtin_user_assembler_name (decl, asmspec);
3399 set_user_assembler_name (decl, asmspec);
3402 /* If #pragma weak was used, mark the decl weak now. */
3403 maybe_apply_pragma_weak (decl);
3405 /* If this is a variable definition, determine its ELF visibility. */
3406 if (TREE_CODE (decl) == VAR_DECL
3407 && TREE_STATIC (decl)
3408 && !DECL_EXTERNAL (decl))
3409 c_determine_visibility (decl);
3411 /* Output the assembler code and/or RTL code for variables and functions,
3412 unless the type is an undefined structure or union.
3413 If not, it will get done when the type is completed. */
3415 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3417 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3418 if (c_dialect_objc ())
3419 objc_check_decl (decl);
3423 /* If this is not a static variable, issue a warning.
3424 It doesn't make any sense to give an ASMSPEC for an
3425 ordinary, non-register local variable. Historically,
3426 GCC has accepted -- but ignored -- the ASMSPEC in
3428 if (!DECL_FILE_SCOPE_P (decl)
3429 && TREE_CODE (decl) == VAR_DECL
3430 && !C_DECL_REGISTER (decl)
3431 && !TREE_STATIC (decl))
3432 warning (0, "ignoring asm-specifier for non-static local "
3433 "variable %q+D", decl);
3435 set_user_assembler_name (decl, asmspec);
3438 if (DECL_FILE_SCOPE_P (decl))
3440 if (DECL_INITIAL (decl) == NULL_TREE
3441 || DECL_INITIAL (decl) == error_mark_node)
3442 /* Don't output anything
3443 when a tentative file-scope definition is seen.
3444 But at end of compilation, do output code for them. */
3445 DECL_DEFER_OUTPUT (decl) = 1;
3446 rest_of_decl_compilation (decl, true, 0);
3450 /* In conjunction with an ASMSPEC, the `register'
3451 keyword indicates that we should place the variable
3452 in a particular register. */
3453 if (asmspec && C_DECL_REGISTER (decl))
3455 DECL_HARD_REGISTER (decl) = 1;
3456 /* This cannot be done for a structure with volatile
3457 fields, on which DECL_REGISTER will have been
3459 if (!DECL_REGISTER (decl))
3460 error ("cannot put object with volatile field into register");
3463 if (TREE_CODE (decl) != FUNCTION_DECL)
3465 /* If we're building a variable sized type, and we might be
3466 reachable other than via the top of the current binding
3467 level, then create a new BIND_EXPR so that we deallocate
3468 the object at the right time. */
3469 /* Note that DECL_SIZE can be null due to errors. */
3470 if (DECL_SIZE (decl)
3471 && !TREE_CONSTANT (DECL_SIZE (decl))
3472 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3475 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3476 TREE_SIDE_EFFECTS (bind) = 1;
3478 BIND_EXPR_BODY (bind) = push_stmt_list ();
3480 add_stmt (build_stmt (DECL_EXPR, decl));
3485 if (!DECL_FILE_SCOPE_P (decl))
3487 /* Recompute the RTL of a local array now
3488 if it used to be an incomplete type. */
3490 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3492 /* If we used it already as memory, it must stay in memory. */
3493 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3494 /* If it's still incomplete now, no init will save it. */
3495 if (DECL_SIZE (decl) == 0)
3496 DECL_INITIAL (decl) = 0;
3501 /* If this was marked 'used', be sure it will be output. */
3502 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3503 mark_decl_referenced (decl);
3505 if (TREE_CODE (decl) == TYPE_DECL)
3507 if (!DECL_FILE_SCOPE_P (decl)
3508 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3509 add_stmt (build_stmt (DECL_EXPR, decl));
3511 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3514 /* At the end of a declaration, throw away any variable type sizes
3515 of types defined inside that declaration. There is no use
3516 computing them in the following function definition. */
3517 if (current_scope == file_scope)
3518 get_pending_sizes ();
3520 /* Install a cleanup (aka destructor) if one was given. */
3521 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3523 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3526 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3527 tree cleanup_decl = lookup_name (cleanup_id);
3530 /* Build "cleanup(&decl)" for the destructor. */
3531 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3532 cleanup = build_tree_list (NULL_TREE, cleanup);
3533 cleanup = build_function_call (cleanup_decl, cleanup);
3535 /* Don't warn about decl unused; the cleanup uses it. */
3536 TREE_USED (decl) = 1;
3537 TREE_USED (cleanup_decl) = 1;
3539 /* Initialize EH, if we've been told to do so. */
3540 if (flag_exceptions && !c_eh_initialized_p)
3542 c_eh_initialized_p = true;
3543 eh_personality_libfunc
3544 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3545 ? "__gcc_personality_sj0"
3546 : "__gcc_personality_v0");
3547 default_init_unwind_resume_libfunc ();
3548 using_eh_for_cleanups ();
3551 push_cleanup (decl, cleanup, false);
3556 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3559 grokparm (const struct c_parm *parm)
3561 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3564 decl_attributes (&decl, parm->attrs, 0);
3569 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3570 and push that on the current scope. */
3573 push_parm_decl (const struct c_parm *parm)
3577 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3578 decl_attributes (&decl, parm->attrs, 0);
3580 decl = pushdecl (decl);
3582 finish_decl (decl, NULL_TREE, NULL_TREE);
3585 /* Mark all the parameter declarations to date as forward decls.
3586 Also diagnose use of this extension. */
3589 mark_forward_parm_decls (void)
3591 struct c_binding *b;
3593 if (pedantic && !current_scope->warned_forward_parm_decls)
3595 pedwarn ("ISO C forbids forward parameter declarations");
3596 current_scope->warned_forward_parm_decls = true;
3599 for (b = current_scope->bindings; b; b = b->prev)
3600 if (TREE_CODE (b->decl) == PARM_DECL)
3601 TREE_ASM_WRITTEN (b->decl) = 1;
3604 static GTY(()) int compound_literal_number;
3606 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3607 literal, which may be an incomplete array type completed by the
3608 initializer; INIT is a CONSTRUCTOR that initializes the compound
3612 build_compound_literal (tree type, tree init)
3614 /* We do not use start_decl here because we have a type, not a declarator;
3615 and do not use finish_decl because the decl should be stored inside
3616 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3621 if (type == error_mark_node)
3622 return error_mark_node;
3624 decl = build_decl (VAR_DECL, NULL_TREE, type);
3625 DECL_EXTERNAL (decl) = 0;
3626 TREE_PUBLIC (decl) = 0;
3627 TREE_STATIC (decl) = (current_scope == file_scope);
3628 DECL_CONTEXT (decl) = current_function_decl;
3629 TREE_USED (decl) = 1;
3630 TREE_TYPE (decl) = type;
3631 TREE_READONLY (decl) = TYPE_READONLY (type);
3632 store_init_value (decl, init);
3634 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3636 int failure = complete_array_type (&TREE_TYPE (decl),
3637 DECL_INITIAL (decl), true);
3638 gcc_assert (!failure);
3640 type = TREE_TYPE (decl);
3641 TREE_TYPE (DECL_INITIAL (decl)) = type;
3644 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3645 return error_mark_node;
3647 stmt = build_stmt (DECL_EXPR, decl);
3648 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3649 TREE_SIDE_EFFECTS (complit) = 1;
3651 layout_decl (decl, 0);
3653 if (TREE_STATIC (decl))
3655 /* This decl needs a name for the assembler output. We also need
3656 a unique suffix to be added to the name. */
3659 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3660 compound_literal_number);
3661 compound_literal_number++;
3662 DECL_NAME (decl) = get_identifier (name);
3663 DECL_DEFER_OUTPUT (decl) = 1;
3664 DECL_COMDAT (decl) = 1;
3665 DECL_ARTIFICIAL (decl) = 1;
3666 DECL_IGNORED_P (decl) = 1;
3668 rest_of_decl_compilation (decl, 1, 0);
3674 /* Determine whether TYPE is a structure with a flexible array member,
3675 or a union containing such a structure (possibly recursively). */
3678 flexible_array_type_p (tree type)
3681 switch (TREE_CODE (type))
3684 x = TYPE_FIELDS (type);
3687 while (TREE_CHAIN (x) != NULL_TREE)
3689 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3690 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3691 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3692 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3696 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3698 if (flexible_array_type_p (TREE_TYPE (x)))
3707 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3708 replacing with appropriate values if they are invalid. */
3710 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3713 unsigned int max_width;
3714 unsigned HOST_WIDE_INT w;
3715 const char *name = orig_name ? orig_name: _("<anonymous>");
3717 /* Detect and ignore out of range field width and process valid
3719 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3720 || TREE_CODE (*width) != INTEGER_CST)
3722 error ("bit-field %qs width not an integer constant", name);
3723 *width = integer_one_node;
3727 constant_expression_warning (*width);
3728 if (tree_int_cst_sgn (*width) < 0)
3730 error ("negative width in bit-field %qs", name);
3731 *width = integer_one_node;
3733 else if (integer_zerop (*width) && orig_name)
3735 error ("zero width for bit-field %qs", name);
3736 *width = integer_one_node;
3740 /* Detect invalid bit-field type. */
3741 if (TREE_CODE (*type) != INTEGER_TYPE
3742 && TREE_CODE (*type) != BOOLEAN_TYPE
3743 && TREE_CODE (*type) != ENUMERAL_TYPE)
3745 error ("bit-field %qs has invalid type", name);
3746 *type = unsigned_type_node;
3749 type_mv = TYPE_MAIN_VARIANT (*type);
3751 && type_mv != integer_type_node
3752 && type_mv != unsigned_type_node
3753 && type_mv != boolean_type_node)
3754 pedwarn ("type of bit-field %qs is a GCC extension", name);
3756 if (type_mv == boolean_type_node)
3757 max_width = CHAR_TYPE_SIZE;
3759 max_width = TYPE_PRECISION (*type);
3761 if (0 < compare_tree_int (*width, max_width))
3763 error ("width of %qs exceeds its type", name);
3765 *width = build_int_cst (NULL_TREE, w);
3768 w = tree_low_cst (*width, 1);
3770 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3772 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3774 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3775 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3776 warning (0, "%qs is narrower than values of its type", name);
3780 /* Build a bit-field integer type for the given WIDTH and UNSIGNEDP. */
3782 c_build_bitfield_integer_type (unsigned HOST_WIDE_INT width, int unsignedp)
3784 /* Extended integer types of the same width as a standard type have
3785 lesser rank, so those of the same width as int promote to int or
3786 unsigned int and are valid for printf formats expecting int or
3787 unsigned int. To avoid such special cases, avoid creating
3788 extended integer types for bit-fields if a standard integer type
3790 if (width == TYPE_PRECISION (integer_type_node))
3791 return unsignedp ? unsigned_type_node : integer_type_node;
3792 if (width == TYPE_PRECISION (signed_char_type_node))
3793 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3794 if (width == TYPE_PRECISION (short_integer_type_node))
3795 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3796 if (width == TYPE_PRECISION (long_integer_type_node))
3797 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3798 if (width == TYPE_PRECISION (long_long_integer_type_node))
3799 return (unsignedp ? long_long_unsigned_type_node
3800 : long_long_integer_type_node);
3801 return build_nonstandard_integer_type (width, unsignedp);
3804 /* Given declspecs and a declarator,
3805 determine the name and type of the object declared
3806 and construct a ..._DECL node for it.
3807 (In one case we can return a ..._TYPE node instead.
3808 For invalid input we sometimes return 0.)
3810 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3812 DECL_CONTEXT says which syntactic context this declaration is in:
3813 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3814 FUNCDEF for a function definition. Like NORMAL but a few different
3815 error messages in each case. Return value may be zero meaning
3816 this definition is too screwy to try to parse.
3817 PARM for a parameter declaration (either within a function prototype
3818 or before a function body). Make a PARM_DECL, or return void_type_node.
3819 TYPENAME if for a typename (in a cast or sizeof).
3820 Don't make a DECL node; just return the ..._TYPE node.
3821 FIELD for a struct or union field; make a FIELD_DECL.
3822 INITIALIZED is true if the decl has an initializer.
3823 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3824 representing the width of the bit-field.
3826 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3827 It may also be so in the PARM case, for a prototype where the
3828 argument type is specified but not the name.
3830 This function is where the complicated C meanings of `static'
3831 and `extern' are interpreted. */
3834 grokdeclarator (const struct c_declarator *declarator,
3835 struct c_declspecs *declspecs,
3836 enum decl_context decl_context, bool initialized, tree *width)
3838 tree type = declspecs->type;
3839 bool threadp = declspecs->thread_p;
3840 enum c_storage_class storage_class = declspecs->storage_class;
3844 int type_quals = TYPE_UNQUALIFIED;
3845 const char *name, *orig_name;
3846 tree typedef_type = 0;
3847 int funcdef_flag = 0;
3848 bool funcdef_syntax = false;
3849 int size_varies = 0;
3850 tree decl_attr = declspecs->decl_attr;
3851 int array_ptr_quals = TYPE_UNQUALIFIED;
3852 tree array_ptr_attrs = NULL_TREE;
3853 int array_parm_static = 0;
3854 tree returned_attrs = NULL_TREE;
3855 bool bitfield = width != NULL;
3857 struct c_arg_info *arg_info = 0;
3859 if (decl_context == FUNCDEF)
3860 funcdef_flag = 1, decl_context = NORMAL;
3862 /* Look inside a declarator for the name being declared
3863 and get it as a string, for an error message. */
3865 const struct c_declarator *decl = declarator;
3874 funcdef_syntax = (decl->kind == cdk_function);
3875 decl = decl->declarator;
3879 decl = decl->declarator;
3884 name = IDENTIFIER_POINTER (decl->u.id);
3896 /* A function definition's declarator must have the form of
3897 a function declarator. */
3899 if (funcdef_flag && !funcdef_syntax)
3902 /* If this looks like a function definition, make it one,
3903 even if it occurs where parms are expected.
3904 Then store_parm_decls will reject it and not use it as a parm. */
3905 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3906 decl_context = PARM;
3908 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3909 warn_deprecated_use (declspecs->type);
3911 typedef_type = type;
3912 size_varies = C_TYPE_VARIABLE_SIZE (type);
3914 /* Diagnose defaulting to "int". */
3916 if (declspecs->default_int_p && !in_system_header)
3918 /* Issue a warning if this is an ISO C 99 program or if
3919 -Wreturn-type and this is a function, or if -Wimplicit;
3920 prefer the former warning since it is more explicit. */
3921 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3923 warn_about_return_type = 1;
3924 else if (warn_implicit_int || flag_isoc99)
3925 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3928 /* Adjust the type if a bit-field is being declared,
3929 -funsigned-bitfields applied and the type is not explicitly
3931 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
3932 && TREE_CODE (type) == INTEGER_TYPE)
3933 type = c_common_unsigned_type (type);
3935 /* Figure out the type qualifiers for the declaration. There are
3936 two ways a declaration can become qualified. One is something
3937 like `const int i' where the `const' is explicit. Another is
3938 something like `typedef const int CI; CI i' where the type of the
3939 declaration contains the `const'. A third possibility is that
3940 there is a type qualifier on the element type of a typedefed
3941 array type, in which case we should extract that qualifier so
3942 that c_apply_type_quals_to_decls receives the full list of
3943 qualifiers to work with (C90 is not entirely clear about whether
3944 duplicate qualifiers should be diagnosed in this case, but it
3945 seems most appropriate to do so). */
3946 element_type = strip_array_types (type);
3947 constp = declspecs->const_p + TYPE_READONLY (element_type);
3948 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
3949 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
3950 if (pedantic && !flag_isoc99)
3953 pedwarn ("duplicate %<const%>");
3955 pedwarn ("duplicate %<restrict%>");
3957 pedwarn ("duplicate %<volatile%>");
3959 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
3960 type = TYPE_MAIN_VARIANT (type);
3961 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3962 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3963 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3965 /* Warn about storage classes that are invalid for certain
3966 kinds of declarations (parameters, typenames, etc.). */
3970 || storage_class == csc_auto
3971 || storage_class == csc_register
3972 || storage_class == csc_typedef))
3974 if (storage_class == csc_auto
3975 && (pedantic || current_scope == file_scope))
3976 pedwarn ("function definition declared %<auto%>");
3977 if (storage_class == csc_register)
3978 error ("function definition declared %<register%>");
3979 if (storage_class == csc_typedef)
3980 error ("function definition declared %<typedef%>");
3982 error ("function definition declared %<__thread%>");
3984 if (storage_class == csc_auto
3985 || storage_class == csc_register
3986 || storage_class == csc_typedef)
3987 storage_class = csc_none;
3989 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
3991 if (decl_context == PARM && storage_class == csc_register)
3995 switch (decl_context)
3998 error ("storage class specified for structure field %qs",
4002 error ("storage class specified for parameter %qs", name);
4005 error ("storage class specified for typename");
4008 storage_class = csc_none;
4012 else if (storage_class == csc_extern
4016 /* 'extern' with initialization is invalid if not at file scope. */
4017 if (current_scope == file_scope)
4018 warning (0, "%qs initialized and declared %<extern%>", name);
4020 error ("%qs has both %<extern%> and initializer", name);
4022 else if (current_scope == file_scope)
4024 if (storage_class == csc_auto)
4025 error ("file-scope declaration of %qs specifies %<auto%>", name);
4026 if (pedantic && storage_class == csc_register)
4027 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
4031 if (storage_class == csc_extern && funcdef_flag)
4032 error ("nested function %qs declared %<extern%>", name);
4033 else if (threadp && storage_class == csc_none)
4035 error ("function-scope %qs implicitly auto and declared "
4042 /* Now figure out the structure of the declarator proper.
4043 Descend through it, creating more complex types, until we reach
4044 the declared identifier (or NULL_TREE, in an absolute declarator).
4045 At each stage we maintain an unqualified version of the type
4046 together with any qualifiers that should be applied to it with
4047 c_build_qualified_type; this way, array types including
4048 multidimensional array types are first built up in unqualified
4049 form and then the qualified form is created with
4050 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4052 while (declarator && declarator->kind != cdk_id)
4054 if (type == error_mark_node)
4056 declarator = declarator->declarator;
4060 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4061 a cdk_pointer (for *...),
4062 a cdk_function (for ...(...)),
4063 a cdk_attrs (for nested attributes),
4064 or a cdk_id (for the name being declared
4065 or the place in an absolute declarator
4066 where the name was omitted).
4067 For the last case, we have just exited the loop.
4069 At this point, TYPE is the type of elements of an array,
4070 or for a function to return, or for a pointer to point to.
4071 After this sequence of ifs, TYPE is the type of the
4072 array or function or pointer, and DECLARATOR has had its
4073 outermost layer removed. */
4075 if (array_ptr_quals != TYPE_UNQUALIFIED
4076 || array_ptr_attrs != NULL_TREE
4077 || array_parm_static)
4079 /* Only the innermost declarator (making a parameter be of
4080 array type which is converted to pointer type)
4081 may have static or type qualifiers. */
4082 error ("static or type qualifiers in non-parameter array declarator");
4083 array_ptr_quals = TYPE_UNQUALIFIED;
4084 array_ptr_attrs = NULL_TREE;
4085 array_parm_static = 0;
4088 switch (declarator->kind)
4092 /* A declarator with embedded attributes. */
4093 tree attrs = declarator->u.attrs;
4094 const struct c_declarator *inner_decl;
4096 declarator = declarator->declarator;
4097 inner_decl = declarator;
4098 while (inner_decl->kind == cdk_attrs)
4099 inner_decl = inner_decl->declarator;
4100 if (inner_decl->kind == cdk_id)
4101 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4102 else if (inner_decl->kind == cdk_function)
4103 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4104 else if (inner_decl->kind == cdk_array)
4105 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4106 returned_attrs = decl_attributes (&type,
4107 chainon (returned_attrs, attrs),
4113 tree itype = NULL_TREE;
4114 tree size = declarator->u.array.dimen;
4115 /* The index is a signed object `sizetype' bits wide. */
4116 tree index_type = c_common_signed_type (sizetype);
4118 array_ptr_quals = declarator->u.array.quals;
4119 array_ptr_attrs = declarator->u.array.attrs;
4120 array_parm_static = declarator->u.array.static_p;
4122 declarator = declarator->declarator;
4124 /* Check for some types that there cannot be arrays of. */
4126 if (VOID_TYPE_P (type))
4128 error ("declaration of %qs as array of voids", name);
4129 type = error_mark_node;
4132 if (TREE_CODE (type) == FUNCTION_TYPE)
4134 error ("declaration of %qs as array of functions", name);
4135 type = error_mark_node;
4138 if (pedantic && !in_system_header && flexible_array_type_p (type))
4139 pedwarn ("invalid use of structure with flexible array member");
4141 if (size == error_mark_node)
4142 type = error_mark_node;
4144 if (type == error_mark_node)
4147 /* If size was specified, set ITYPE to a range-type for
4148 that size. Otherwise, ITYPE remains null. finish_decl
4149 may figure it out from an initial value. */
4153 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4155 STRIP_TYPE_NOPS (size);
4157 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4159 error ("size of array %qs has non-integer type", name);
4160 size = integer_one_node;
4163 if (pedantic && integer_zerop (size))
4164 pedwarn ("ISO C forbids zero-size array %qs", name);
4166 if (TREE_CODE (size) == INTEGER_CST)
4168 constant_expression_warning (size);
4169 if (tree_int_cst_sgn (size) < 0)
4171 error ("size of array %qs is negative", name);
4172 size = integer_one_node;
4177 /* Make sure the array size remains visibly
4178 nonconstant even if it is (eg) a const variable
4179 with known value. */
4182 if (!flag_isoc99 && pedantic)
4184 if (TREE_CONSTANT (size))
4185 pedwarn ("ISO C90 forbids array %qs whose size "
4186 "can%'t be evaluated",
4189 pedwarn ("ISO C90 forbids variable-size array %qs",
4194 if (integer_zerop (size))
4196 /* A zero-length array cannot be represented with
4197 an unsigned index type, which is what we'll
4198 get with build_index_type. Create an
4199 open-ended range instead. */
4200 itype = build_range_type (sizetype, size, NULL_TREE);
4204 /* Arrange for the SAVE_EXPR on the inside of the
4205 MINUS_EXPR, which allows the -1 to get folded
4206 with the +1 that happens when building TYPE_SIZE. */
4208 size = variable_size (size);
4210 /* Compute the maximum valid index, that is, size
4211 - 1. Do the calculation in index_type, so that
4212 if it is a variable the computations will be
4213 done in the proper mode. */
4214 itype = fold_build2 (MINUS_EXPR, index_type,
4215 convert (index_type, size),
4216 convert (index_type,
4219 /* If that overflowed, the array is too big. ???
4220 While a size of INT_MAX+1 technically shouldn't
4221 cause an overflow (because we subtract 1), the
4222 overflow is recorded during the conversion to
4223 index_type, before the subtraction. Handling
4224 this case seems like an unnecessary
4226 if (TREE_CODE (itype) == INTEGER_CST
4227 && TREE_OVERFLOW (itype))
4229 error ("size of array %qs is too large", name);
4230 type = error_mark_node;
4234 itype = build_index_type (itype);
4237 else if (decl_context == FIELD)
4239 if (pedantic && !flag_isoc99 && !in_system_header)
4240 pedwarn ("ISO C90 does not support flexible array members");
4242 /* ISO C99 Flexible array members are effectively
4243 identical to GCC's zero-length array extension. */
4244 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4247 /* Complain about arrays of incomplete types. */
4248 if (!COMPLETE_TYPE_P (type))
4250 error ("array type has incomplete element type");
4251 type = error_mark_node;
4254 type = build_array_type (type, itype);
4256 if (type != error_mark_node)
4259 C_TYPE_VARIABLE_SIZE (type) = 1;
4261 /* The GCC extension for zero-length arrays differs from
4262 ISO flexible array members in that sizeof yields
4264 if (size && integer_zerop (size))
4266 TYPE_SIZE (type) = bitsize_zero_node;
4267 TYPE_SIZE_UNIT (type) = size_zero_node;
4271 if (decl_context != PARM
4272 && (array_ptr_quals != TYPE_UNQUALIFIED
4273 || array_ptr_attrs != NULL_TREE
4274 || array_parm_static))
4276 error ("static or type qualifiers in non-parameter array declarator");
4277 array_ptr_quals = TYPE_UNQUALIFIED;
4278 array_ptr_attrs = NULL_TREE;
4279 array_parm_static = 0;
4285 /* Say it's a definition only for the declarator closest
4286 to the identifier, apart possibly from some
4288 bool really_funcdef = false;
4292 const struct c_declarator *t = declarator->declarator;
4293 while (t->kind == cdk_attrs)
4295 really_funcdef = (t->kind == cdk_id);
4298 /* Declaring a function type. Make sure we have a valid
4299 type for the function to return. */
4300 if (type == error_mark_node)
4305 /* Warn about some types functions can't return. */
4306 if (TREE_CODE (type) == FUNCTION_TYPE)
4308 error ("%qs declared as function returning a function", name);
4309 type = integer_type_node;
4311 if (TREE_CODE (type) == ARRAY_TYPE)
4313 error ("%qs declared as function returning an array", name);
4314 type = integer_type_node;
4317 /* Construct the function type and go to the next
4318 inner layer of declarator. */
4319 arg_info = declarator->u.arg_info;
4320 arg_types = grokparms (arg_info, really_funcdef);
4322 /* Type qualifiers before the return type of the function
4323 qualify the return type, not the function type. */
4326 /* Type qualifiers on a function return type are
4327 normally permitted by the standard but have no
4328 effect, so give a warning at -Wreturn-type.
4329 Qualifiers on a void return type are banned on
4330 function definitions in ISO C; GCC used to used
4331 them for noreturn functions. */
4332 if (VOID_TYPE_P (type) && really_funcdef)
4333 pedwarn ("function definition has qualified void return type");
4335 warning (OPT_Wreturn_type,
4336 "type qualifiers ignored on function return type");
4338 type = c_build_qualified_type (type, type_quals);
4340 type_quals = TYPE_UNQUALIFIED;
4342 type = build_function_type (type, arg_types);
4343 declarator = declarator->declarator;
4345 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4346 the formal parameter list of this FUNCTION_TYPE to point to
4347 the FUNCTION_TYPE node itself. */
4351 for (link = arg_info->tags;
4353 link = TREE_CHAIN (link))
4354 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4360 /* Merge any constancy or volatility into the target type
4363 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4365 pedwarn ("ISO C forbids qualified function types");
4367 type = c_build_qualified_type (type, type_quals);
4370 type = build_pointer_type (type);
4372 /* Process type qualifiers (such as const or volatile)
4373 that were given inside the `*'. */
4374 type_quals = declarator->u.pointer_quals;
4376 declarator = declarator->declarator;
4384 /* Now TYPE has the actual type, apart from any qualifiers in
4387 /* Check the type and width of a bit-field. */
4389 check_bitfield_type_and_width (&type, width, orig_name);
4391 /* Did array size calculations overflow? */
4393 if (TREE_CODE (type) == ARRAY_TYPE
4394 && COMPLETE_TYPE_P (type)
4395 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4396 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4398 error ("size of array %qs is too large", name);
4399 /* If we proceed with the array type as it is, we'll eventually
4400 crash in tree_low_cst(). */
4401 type = error_mark_node;
4404 /* If this is declaring a typedef name, return a TYPE_DECL. */
4406 if (storage_class == csc_typedef)
4409 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4411 pedwarn ("ISO C forbids qualified function types");
4413 type = c_build_qualified_type (type, type_quals);
4414 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4415 if (declspecs->explicit_signed_p)
4416 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4417 decl_attributes (&decl, returned_attrs, 0);
4418 if (declspecs->inline_p)
4419 pedwarn ("typedef %q+D declared %<inline%>", decl);
4423 /* Detect the case of an array type of unspecified size
4424 which came, as such, direct from a typedef name.
4425 We must copy the type, so that each identifier gets
4426 a distinct type, so that each identifier's size can be
4427 controlled separately by its own initializer. */
4429 if (type != 0 && typedef_type != 0
4430 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4431 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4433 type = build_array_type (TREE_TYPE (type), 0);
4435 C_TYPE_VARIABLE_SIZE (type) = 1;
4438 /* If this is a type name (such as, in a cast or sizeof),
4439 compute the type and return it now. */
4441 if (decl_context == TYPENAME)
4443 /* Note that the grammar rejects storage classes in typenames
4445 gcc_assert (storage_class == csc_none && !threadp
4446 && !declspecs->inline_p);
4447 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4449 pedwarn ("ISO C forbids const or volatile function types");
4451 type = c_build_qualified_type (type, type_quals);
4452 decl_attributes (&type, returned_attrs, 0);
4456 /* Aside from typedefs and type names (handle above),
4457 `void' at top level (not within pointer)
4458 is allowed only in public variables.
4459 We don't complain about parms either, but that is because
4460 a better error message can be made later. */
4462 if (VOID_TYPE_P (type) && decl_context != PARM
4463 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4464 && (storage_class == csc_extern
4465 || (current_scope == file_scope
4466 && !(storage_class == csc_static
4467 || storage_class == csc_register)))))
4469 error ("variable or field %qs declared void", name);
4470 type = integer_type_node;
4473 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4474 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4479 if (decl_context == PARM)
4481 tree type_as_written;
4484 /* A parameter declared as an array of T is really a pointer to T.
4485 One declared as a function is really a pointer to a function. */
4487 if (TREE_CODE (type) == ARRAY_TYPE)
4489 /* Transfer const-ness of array into that of type pointed to. */
4490 type = TREE_TYPE (type);
4492 type = c_build_qualified_type (type, type_quals);
4493 type = build_pointer_type (type);
4494 type_quals = array_ptr_quals;
4496 /* We don't yet implement attributes in this context. */
4497 if (array_ptr_attrs != NULL_TREE)
4498 warning (OPT_Wattributes,
4499 "attributes in parameter array declarator ignored");
4503 else if (TREE_CODE (type) == FUNCTION_TYPE)
4505 if (pedantic && type_quals)
4506 pedwarn ("ISO C forbids qualified function types");
4508 type = c_build_qualified_type (type, type_quals);
4509 type = build_pointer_type (type);
4510 type_quals = TYPE_UNQUALIFIED;
4512 else if (type_quals)
4513 type = c_build_qualified_type (type, type_quals);
4515 type_as_written = type;
4517 decl = build_decl (PARM_DECL, declarator->u.id, type);
4519 C_DECL_VARIABLE_SIZE (decl) = 1;
4521 /* Compute the type actually passed in the parmlist,
4522 for the case where there is no prototype.
4523 (For example, shorts and chars are passed as ints.)
4524 When there is a prototype, this is overridden later. */
4526 if (type == error_mark_node)
4527 promoted_type = type;
4529 promoted_type = c_type_promotes_to (type);
4531 DECL_ARG_TYPE (decl) = promoted_type;
4532 if (declspecs->inline_p)
4533 pedwarn ("parameter %q+D declared %<inline%>", decl);
4535 else if (decl_context == FIELD)
4537 /* Note that the grammar rejects storage classes in typenames
4539 gcc_assert (storage_class == csc_none && !threadp
4540 && !declspecs->inline_p);
4542 /* Structure field. It may not be a function. */
4544 if (TREE_CODE (type) == FUNCTION_TYPE)
4546 error ("field %qs declared as a function", name);
4547 type = build_pointer_type (type);
4549 else if (TREE_CODE (type) != ERROR_MARK
4550 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4552 error ("field %qs has incomplete type", name);
4553 type = error_mark_node;
4555 type = c_build_qualified_type (type, type_quals);
4556 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4557 DECL_NONADDRESSABLE_P (decl) = bitfield;
4560 C_DECL_VARIABLE_SIZE (decl) = 1;
4562 else if (TREE_CODE (type) == FUNCTION_TYPE)
4564 if (storage_class == csc_register || threadp)
4566 error ("invalid storage class for function %qs", name);
4568 else if (current_scope != file_scope)
4570 /* Function declaration not at file scope. Storage
4571 classes other than `extern' are not allowed, C99
4572 6.7.1p5, and `extern' makes no difference. However,
4573 GCC allows 'auto', perhaps with 'inline', to support
4574 nested functions. */
4575 if (storage_class == csc_auto)
4578 pedwarn ("invalid storage class for function %qs", name);
4580 else if (storage_class == csc_static)
4582 error ("invalid storage class for function %qs", name);
4584 storage_class = declspecs->storage_class = csc_none;
4590 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4591 decl = build_decl_attribute_variant (decl, decl_attr);
4593 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4595 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4596 pedwarn ("ISO C forbids qualified function types");
4598 /* GNU C interprets a volatile-qualified function type to indicate
4599 that the function does not return. */
4600 if ((type_quals & TYPE_QUAL_VOLATILE)
4601 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4602 warning (0, "%<noreturn%> function returns non-void value");
4604 /* Every function declaration is an external reference
4605 (DECL_EXTERNAL) except for those which are not at file
4606 scope and are explicitly declared "auto". This is
4607 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4608 GCC to signify a forward declaration of a nested function. */
4609 if (storage_class == csc_auto && current_scope != file_scope)
4610 DECL_EXTERNAL (decl) = 0;
4612 DECL_EXTERNAL (decl) = 1;
4614 /* Record absence of global scope for `static' or `auto'. */
4616 = !(storage_class == csc_static || storage_class == csc_auto);
4618 /* For a function definition, record the argument information
4619 block where store_parm_decls will look for it. */
4621 current_function_arg_info = arg_info;
4623 if (declspecs->default_int_p)
4624 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4626 /* Record presence of `inline', if it is reasonable. */
4627 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4629 if (declspecs->inline_p)
4630 pedwarn ("cannot inline function %<main%>");
4632 else if (declspecs->inline_p)
4634 /* Record that the function is declared `inline'. */
4635 DECL_DECLARED_INLINE_P (decl) = 1;
4637 /* Do not mark bare declarations as DECL_INLINE. Doing so
4638 in the presence of multiple declarations can result in
4639 the abstract origin pointing between the declarations,
4640 which will confuse dwarf2out. */
4643 DECL_INLINE (decl) = 1;
4644 if (storage_class == csc_extern)
4645 current_extern_inline = 1;
4648 /* If -finline-functions, assume it can be inlined. This does
4649 two things: let the function be deferred until it is actually
4650 needed, and let dwarf2 know that the function is inlinable. */
4651 else if (flag_inline_trees == 2 && initialized)
4652 DECL_INLINE (decl) = 1;
4656 /* It's a variable. */
4657 /* An uninitialized decl with `extern' is a reference. */
4658 int extern_ref = !initialized && storage_class == csc_extern;
4660 type = c_build_qualified_type (type, type_quals);
4662 /* C99 6.2.2p7: It is invalid (compile-time undefined
4663 behavior) to create an 'extern' declaration for a
4664 variable if there is a global declaration that is
4665 'static' and the global declaration is not visible.
4666 (If the static declaration _is_ currently visible,
4667 the 'extern' declaration is taken to refer to that decl.) */
4668 if (extern_ref && current_scope != file_scope)
4670 tree global_decl = identifier_global_value (declarator->u.id);
4671 tree visible_decl = lookup_name (declarator->u.id);
4674 && global_decl != visible_decl
4675 && TREE_CODE (global_decl) == VAR_DECL
4676 && !TREE_PUBLIC (global_decl))
4677 error ("variable previously declared %<static%> redeclared "
4681 decl = build_decl (VAR_DECL, declarator->u.id, type);
4682 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4684 C_DECL_VARIABLE_SIZE (decl) = 1;
4686 if (declspecs->inline_p)
4687 pedwarn ("variable %q+D declared %<inline%>", decl);
4689 /* At file scope, an initialized extern declaration may follow
4690 a static declaration. In that case, DECL_EXTERNAL will be
4691 reset later in start_decl. */
4692 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4694 /* At file scope, the presence of a `static' or `register' storage
4695 class specifier, or the absence of all storage class specifiers
4696 makes this declaration a definition (perhaps tentative). Also,
4697 the absence of `static' makes it public. */
4698 if (current_scope == file_scope)
4700 TREE_PUBLIC (decl) = storage_class != csc_static;
4701 TREE_STATIC (decl) = !extern_ref;
4703 /* Not at file scope, only `static' makes a static definition. */
4706 TREE_STATIC (decl) = (storage_class == csc_static);
4707 TREE_PUBLIC (decl) = extern_ref;
4712 if (targetm.have_tls)
4713 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4715 /* A mere warning is sure to result in improper semantics
4716 at runtime. Don't bother to allow this to compile. */
4717 error ("thread-local storage not supported for this target");
4721 /* Record `register' declaration for warnings on &
4722 and in case doing stupid register allocation. */
4724 if (storage_class == csc_register)
4726 C_DECL_REGISTER (decl) = 1;
4727 DECL_REGISTER (decl) = 1;
4730 /* Record constancy and volatility. */
4731 c_apply_type_quals_to_decl (type_quals, decl);
4733 /* If a type has volatile components, it should be stored in memory.
4734 Otherwise, the fact that those components are volatile
4735 will be ignored, and would even crash the compiler.
4736 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4737 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4738 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4739 || TREE_CODE (decl) == RESULT_DECL))
4741 /* It is not an error for a structure with volatile fields to
4742 be declared register, but reset DECL_REGISTER since it
4743 cannot actually go in a register. */
4744 int was_reg = C_DECL_REGISTER (decl);
4745 C_DECL_REGISTER (decl) = 0;
4746 DECL_REGISTER (decl) = 0;
4747 c_mark_addressable (decl);
4748 C_DECL_REGISTER (decl) = was_reg;
4751 /* This is the earliest point at which we might know the assembler
4752 name of a variable. Thus, if it's known before this, die horribly. */
4753 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4755 decl_attributes (&decl, returned_attrs, 0);
4761 /* Decode the parameter-list info for a function type or function definition.
4762 The argument is the value returned by `get_parm_info' (or made in parse.y
4763 if there is an identifier list instead of a parameter decl list).
4764 These two functions are separate because when a function returns
4765 or receives functions then each is called multiple times but the order
4766 of calls is different. The last call to `grokparms' is always the one
4767 that contains the formal parameter names of a function definition.
4769 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4771 FUNCDEF_FLAG is true for a function definition, false for
4772 a mere declaration. A nonempty identifier-list gets an error message
4773 when FUNCDEF_FLAG is false. */
4776 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4778 tree arg_types = arg_info->types;
4780 if (arg_types == 0 && !funcdef_flag && !in_system_header)
4781 warning (OPT_Wstrict_prototypes,
4782 "function declaration isn%'t a prototype");
4784 if (arg_types == error_mark_node)
4785 return 0; /* don't set TYPE_ARG_TYPES in this case */
4787 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4790 pedwarn ("parameter names (without types) in function declaration");
4792 arg_info->parms = arg_info->types;
4793 arg_info->types = 0;
4798 tree parm, type, typelt;
4799 unsigned int parmno;
4801 /* If there is a parameter of incomplete type in a definition,
4802 this is an error. In a declaration this is valid, and a
4803 struct or union type may be completed later, before any calls
4804 or definition of the function. In the case where the tag was
4805 first declared within the parameter list, a warning has
4806 already been given. If a parameter has void type, then
4807 however the function cannot be defined or called, so
4810 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4812 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4814 type = TREE_VALUE (typelt);
4815 if (type == error_mark_node)
4818 if (!COMPLETE_TYPE_P (type))
4822 if (DECL_NAME (parm))
4823 error ("parameter %u (%q+D) has incomplete type",
4826 error ("%Jparameter %u has incomplete type",
4829 TREE_VALUE (typelt) = error_mark_node;
4830 TREE_TYPE (parm) = error_mark_node;
4832 else if (VOID_TYPE_P (type))
4834 if (DECL_NAME (parm))
4835 warning (0, "parameter %u (%q+D) has void type",
4838 warning (0, "%Jparameter %u has void type",
4843 if (DECL_NAME (parm) && TREE_USED (parm))
4844 warn_if_shadowing (parm);
4850 /* Take apart the current scope and return a c_arg_info structure with
4851 info on a parameter list just parsed.
4853 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4855 ELLIPSIS being true means the argument list ended in '...' so don't
4856 append a sentinel (void_list_node) to the end of the type-list. */
4859 get_parm_info (bool ellipsis)
4861 struct c_binding *b = current_scope->bindings;
4862 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4869 static bool explained_incomplete_types = false;
4870 bool gave_void_only_once_err = false;
4872 arg_info->parms = 0;
4874 arg_info->types = 0;
4875 arg_info->others = 0;
4877 /* The bindings in this scope must not get put into a block.
4878 We will take care of deleting the binding nodes. */
4879 current_scope->bindings = 0;
4881 /* This function is only called if there was *something* on the
4885 /* A parameter list consisting solely of 'void' indicates that the
4886 function takes no arguments. But if the 'void' is qualified
4887 (by 'const' or 'volatile'), or has a storage class specifier
4888 ('register'), then the behavior is undefined; issue an error.
4889 Typedefs for 'void' are OK (see DR#157). */
4890 if (b->prev == 0 /* one binding */
4891 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4892 && !DECL_NAME (b->decl) /* anonymous */
4893 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4895 if (TREE_THIS_VOLATILE (b->decl)
4896 || TREE_READONLY (b->decl)
4897 || C_DECL_REGISTER (b->decl))
4898 error ("%<void%> as only parameter may not be qualified");
4900 /* There cannot be an ellipsis. */
4902 error ("%<void%> must be the only parameter");
4904 arg_info->types = void_list_node;
4909 types = void_list_node;
4911 /* Break up the bindings list into parms, tags, types, and others;
4912 apply sanity checks; purge the name-to-decl bindings. */
4915 tree decl = b->decl;
4916 tree type = TREE_TYPE (decl);
4917 const char *keyword;
4919 switch (TREE_CODE (decl))
4924 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4925 I_SYMBOL_BINDING (b->id) = b->shadowed;
4928 /* Check for forward decls that never got their actual decl. */
4929 if (TREE_ASM_WRITTEN (decl))
4930 error ("parameter %q+D has just a forward declaration", decl);
4931 /* Check for (..., void, ...) and issue an error. */
4932 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4934 if (!gave_void_only_once_err)
4936 error ("%<void%> must be the only parameter");
4937 gave_void_only_once_err = true;
4942 /* Valid parameter, add it to the list. */
4943 TREE_CHAIN (decl) = parms;
4946 /* Since there is a prototype, args are passed in their
4947 declared types. The back end may override this later. */
4948 DECL_ARG_TYPE (decl) = type;
4949 types = tree_cons (0, type, types);
4953 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4954 case UNION_TYPE: keyword = "union"; goto tag;
4955 case RECORD_TYPE: keyword = "struct"; goto tag;
4957 /* Types may not have tag-names, in which case the type
4958 appears in the bindings list with b->id NULL. */
4961 gcc_assert (I_TAG_BINDING (b->id) == b);
4962 I_TAG_BINDING (b->id) = b->shadowed;
4965 /* Warn about any struct, union or enum tags defined in a
4966 parameter list. The scope of such types is limited to
4967 the parameter list, which is rarely if ever desirable
4968 (it's impossible to call such a function with type-
4969 correct arguments). An anonymous union parm type is
4970 meaningful as a GNU extension, so don't warn for that. */
4971 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4974 /* The %s will be one of 'struct', 'union', or 'enum'. */
4975 warning (0, "%<%s %E%> declared inside parameter list",
4978 /* The %s will be one of 'struct', 'union', or 'enum'. */
4979 warning (0, "anonymous %s declared inside parameter list",
4982 if (!explained_incomplete_types)
4984 warning (0, "its scope is only this definition or declaration,"
4985 " which is probably not what you want");
4986 explained_incomplete_types = true;
4990 tags = tree_cons (b->id, decl, tags);
4996 /* CONST_DECLs appear here when we have an embedded enum,
4997 and TYPE_DECLs appear here when we have an embedded struct
4998 or union. No warnings for this - we already warned about the
4999 type itself. FUNCTION_DECLs appear when there is an implicit
5000 function declaration in the parameter list. */
5002 TREE_CHAIN (decl) = others;
5007 /* error_mark_node appears here when we have an undeclared
5008 variable. Just throw it away. */
5011 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5012 I_SYMBOL_BINDING (b->id) = b->shadowed;
5016 /* Other things that might be encountered. */
5023 b = free_binding_and_advance (b);
5026 arg_info->parms = parms;
5027 arg_info->tags = tags;
5028 arg_info->types = types;
5029 arg_info->others = others;
5033 /* Get the struct, enum or union (CODE says which) with tag NAME.
5034 Define the tag as a forward-reference if it is not defined.
5035 Return a c_typespec structure for the type specifier. */
5038 parser_xref_tag (enum tree_code code, tree name)
5040 struct c_typespec ret;
5041 /* If a cross reference is requested, look up the type
5042 already defined for this tag and return it. */
5044 tree ref = lookup_tag (code, name, 0);
5045 /* If this is the right type of tag, return what we found.
5046 (This reference will be shadowed by shadow_tag later if appropriate.)
5047 If this is the wrong type of tag, do not return it. If it was the
5048 wrong type in the same scope, we will have had an error
5049 message already; if in a different scope and declaring
5050 a name, pending_xref_error will give an error message; but if in a
5051 different scope and not declaring a name, this tag should
5052 shadow the previous declaration of a different type of tag, and
5053 this would not work properly if we return the reference found.
5054 (For example, with "struct foo" in an outer scope, "union foo;"
5055 must shadow that tag with a new one of union type.) */
5056 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5057 if (ref && TREE_CODE (ref) == code)
5063 /* If no such tag is yet defined, create a forward-reference node
5064 and record it as the "definition".
5065 When a real declaration of this type is found,
5066 the forward-reference will be altered into a real type. */
5068 ref = make_node (code);
5069 if (code == ENUMERAL_TYPE)
5071 /* Give the type a default layout like unsigned int
5072 to avoid crashing if it does not get defined. */
5073 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5074 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5075 TYPE_USER_ALIGN (ref) = 0;
5076 TYPE_UNSIGNED (ref) = 1;
5077 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5078 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5079 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5082 pushtag (name, ref);
5088 /* Get the struct, enum or union (CODE says which) with tag NAME.
5089 Define the tag as a forward-reference if it is not defined.
5090 Return a tree for the type. */
5093 xref_tag (enum tree_code code, tree name)
5095 return parser_xref_tag (code, name).spec;
5098 /* Make sure that the tag NAME is defined *in the current scope*
5099 at least as a forward reference.
5100 CODE says which kind of tag NAME ought to be. */
5103 start_struct (enum tree_code code, tree name)
5105 /* If there is already a tag defined at this scope
5106 (as a forward reference), just return it. */
5111 ref = lookup_tag (code, name, 1);
5112 if (ref && TREE_CODE (ref) == code)
5114 if (TYPE_SIZE (ref))
5116 if (code == UNION_TYPE)
5117 error ("redefinition of %<union %E%>", name);
5119 error ("redefinition of %<struct %E%>", name);
5121 else if (C_TYPE_BEING_DEFINED (ref))
5123 if (code == UNION_TYPE)
5124 error ("nested redefinition of %<union %E%>", name);
5126 error ("nested redefinition of %<struct %E%>", name);
5131 /* Otherwise create a forward-reference just so the tag is in scope. */
5133 ref = make_node (code);
5134 pushtag (name, ref);
5137 C_TYPE_BEING_DEFINED (ref) = 1;
5138 TYPE_PACKED (ref) = flag_pack_struct;
5142 /* Process the specs, declarator and width (NULL if omitted)
5143 of a structure component, returning a FIELD_DECL node.
5144 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5146 This is done during the parsing of the struct declaration.
5147 The FIELD_DECL nodes are chained together and the lot of them
5148 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5151 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5156 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5157 && width == NULL_TREE)
5159 /* This is an unnamed decl.
5161 If we have something of the form "union { list } ;" then this
5162 is the anonymous union extension. Similarly for struct.
5164 If this is something of the form "struct foo;", then
5165 If MS extensions are enabled, this is handled as an
5167 Otherwise this is a forward declaration of a structure tag.
5169 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5170 If MS extensions are enabled and foo names a structure, then
5171 again this is an anonymous struct.
5172 Otherwise this is an error.
5174 Oh what a horrid tangled web we weave. I wonder if MS consciously
5175 took this from Plan 9 or if it was an accident of implementation
5176 that took root before someone noticed the bug... */
5178 tree type = declspecs->type;
5179 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5180 || TREE_CODE (type) == UNION_TYPE);
5184 && (flag_ms_extensions || !declspecs->typedef_p))
5186 if (flag_ms_extensions)
5190 else if (TYPE_NAME (type) == NULL)
5197 pedwarn ("declaration does not declare anything");
5201 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5204 value = grokdeclarator (declarator, declspecs, FIELD, false,
5205 width ? &width : NULL);
5207 finish_decl (value, NULL_TREE, NULL_TREE);
5208 DECL_INITIAL (value) = width;
5213 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5214 the list such that this does not present a problem later. */
5217 detect_field_duplicates (tree fieldlist)
5222 /* First, see if there are more than "a few" fields.
5223 This is trivially true if there are zero or one fields. */
5226 x = TREE_CHAIN (fieldlist);
5232 } while (timeout > 0 && x);
5234 /* If there were "few" fields, avoid the overhead of allocating
5235 a hash table. Instead just do the nested traversal thing. */
5238 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5241 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5242 if (DECL_NAME (y) == DECL_NAME (x))
5244 error ("duplicate member %q+D", x);
5245 DECL_NAME (x) = NULL_TREE;
5251 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5254 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5255 if ((y = DECL_NAME (x)) != 0)
5257 slot = htab_find_slot (htab, y, INSERT);
5260 error ("duplicate member %q+D", x);
5261 DECL_NAME (x) = NULL_TREE;
5270 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5271 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5272 ATTRIBUTES are attributes to be applied to the structure. */
5275 finish_struct (tree t, tree fieldlist, tree attributes)
5278 bool toplevel = file_scope == current_scope;
5279 int saw_named_field;
5281 /* If this type was previously laid out as a forward reference,
5282 make sure we lay it out again. */
5286 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5290 for (x = fieldlist; x; x = TREE_CHAIN (x))
5291 if (DECL_NAME (x) != 0)
5296 if (TREE_CODE (t) == UNION_TYPE)
5299 pedwarn ("union has no named members");
5301 pedwarn ("union has no members");
5306 pedwarn ("struct has no named members");
5308 pedwarn ("struct has no members");
5313 /* Install struct as DECL_CONTEXT of each field decl.
5314 Also process specified field sizes, found in the DECL_INITIAL,
5315 storing 0 there after the type has been changed to precision equal
5316 to its width, rather than the precision of the specified standard
5317 type. (Correct layout requires the original type to have been preserved
5320 saw_named_field = 0;
5321 for (x = fieldlist; x; x = TREE_CHAIN (x))
5323 DECL_CONTEXT (x) = t;
5324 DECL_PACKED (x) |= TYPE_PACKED (t);
5326 /* If any field is const, the structure type is pseudo-const. */
5327 if (TREE_READONLY (x))
5328 C_TYPE_FIELDS_READONLY (t) = 1;
5331 /* A field that is pseudo-const makes the structure likewise. */
5332 tree t1 = TREE_TYPE (x);
5333 while (TREE_CODE (t1) == ARRAY_TYPE)
5334 t1 = TREE_TYPE (t1);
5335 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5336 && C_TYPE_FIELDS_READONLY (t1))
5337 C_TYPE_FIELDS_READONLY (t) = 1;
5340 /* Any field that is volatile means variables of this type must be
5341 treated in some ways as volatile. */
5342 if (TREE_THIS_VOLATILE (x))
5343 C_TYPE_FIELDS_VOLATILE (t) = 1;
5345 /* Any field of nominal variable size implies structure is too. */
5346 if (C_DECL_VARIABLE_SIZE (x))
5347 C_TYPE_VARIABLE_SIZE (t) = 1;
5349 if (DECL_INITIAL (x))
5351 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5352 DECL_SIZE (x) = bitsize_int (width);
5353 DECL_BIT_FIELD (x) = 1;
5354 SET_DECL_C_BIT_FIELD (x);
5357 /* Detect flexible array member in an invalid context. */
5358 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5359 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5360 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5361 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5363 if (TREE_CODE (t) == UNION_TYPE)
5365 error ("%Jflexible array member in union", x);
5366 TREE_TYPE (x) = error_mark_node;
5368 else if (TREE_CHAIN (x) != NULL_TREE)
5370 error ("%Jflexible array member not at end of struct", x);
5371 TREE_TYPE (x) = error_mark_node;
5373 else if (!saw_named_field)
5375 error ("%Jflexible array member in otherwise empty struct", x);
5376 TREE_TYPE (x) = error_mark_node;
5380 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5381 && flexible_array_type_p (TREE_TYPE (x)))
5382 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5385 saw_named_field = 1;
5388 detect_field_duplicates (fieldlist);
5390 /* Now we have the nearly final fieldlist. Record it,
5391 then lay out the structure or union (including the fields). */
5393 TYPE_FIELDS (t) = fieldlist;
5397 /* Give bit-fields their proper types. */
5399 tree *fieldlistp = &fieldlist;
5401 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5402 && TREE_TYPE (*fieldlistp) != error_mark_node)
5404 unsigned HOST_WIDE_INT width
5405 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5406 tree type = TREE_TYPE (*fieldlistp);
5407 if (width != TYPE_PRECISION (type))
5409 TREE_TYPE (*fieldlistp)
5410 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5411 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5413 DECL_INITIAL (*fieldlistp) = 0;
5416 fieldlistp = &TREE_CHAIN (*fieldlistp);
5419 /* Now we have the truly final field list.
5420 Store it in this type and in the variants. */
5422 TYPE_FIELDS (t) = fieldlist;
5424 /* If there are lots of fields, sort so we can look through them fast.
5425 We arbitrarily consider 16 or more elts to be "a lot". */
5430 for (x = fieldlist; x; x = TREE_CHAIN (x))
5432 if (len > 15 || DECL_NAME (x) == NULL)
5440 struct lang_type *space;
5441 struct sorted_fields_type *space2;
5443 len += list_length (x);
5445 /* Use the same allocation policy here that make_node uses, to
5446 ensure that this lives as long as the rest of the struct decl.
5447 All decls in an inline function need to be saved. */
5449 space = GGC_CNEW (struct lang_type);
5450 space2 = GGC_NEWVAR (struct sorted_fields_type,
5451 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5455 field_array = &space2->elts[0];
5456 for (x = fieldlist; x; x = TREE_CHAIN (x))
5458 field_array[len++] = x;
5460 /* If there is anonymous struct or union, break out of the loop. */
5461 if (DECL_NAME (x) == NULL)
5464 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5467 TYPE_LANG_SPECIFIC (t) = space;
5468 TYPE_LANG_SPECIFIC (t)->s->len = len;
5469 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5470 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5475 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5477 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5478 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5479 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5480 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5481 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5482 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5483 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5486 /* If this was supposed to be a transparent union, but we can't
5487 make it one, warn and turn off the flag. */
5488 if (TREE_CODE (t) == UNION_TYPE
5489 && TYPE_TRANSPARENT_UNION (t)
5490 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5492 TYPE_TRANSPARENT_UNION (t) = 0;
5493 warning (0, "union cannot be made transparent");
5496 /* If this structure or union completes the type of any previous
5497 variable declaration, lay it out and output its rtl. */
5498 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5502 tree decl = TREE_VALUE (x);
5503 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5504 layout_array_type (TREE_TYPE (decl));
5505 if (TREE_CODE (decl) != TYPE_DECL)
5507 layout_decl (decl, 0);
5508 if (c_dialect_objc ())
5509 objc_check_decl (decl);
5510 rest_of_decl_compilation (decl, toplevel, 0);
5515 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5517 /* Finish debugging output for this type. */
5518 rest_of_type_compilation (t, toplevel);
5520 /* If we're inside a function proper, i.e. not file-scope and not still
5521 parsing parameters, then arrange for the size of a variable sized type
5523 if (cur_stmt_list && variably_modified_type_p (t, NULL))
5524 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5529 /* Lay out the type T, and its element type, and so on. */
5532 layout_array_type (tree t)
5534 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5535 layout_array_type (TREE_TYPE (t));
5539 /* Begin compiling the definition of an enumeration type.
5540 NAME is its name (or null if anonymous).
5541 Returns the type object, as yet incomplete.
5542 Also records info about it so that build_enumerator
5543 may be used to declare the individual values as they are read. */
5546 start_enum (tree name)
5550 /* If this is the real definition for a previous forward reference,
5551 fill in the contents in the same object that used to be the
5552 forward reference. */
5555 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5557 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5559 enumtype = make_node (ENUMERAL_TYPE);
5560 pushtag (name, enumtype);
5563 if (C_TYPE_BEING_DEFINED (enumtype))
5564 error ("nested redefinition of %<enum %E%>", name);
5566 C_TYPE_BEING_DEFINED (enumtype) = 1;
5568 if (TYPE_VALUES (enumtype) != 0)
5570 /* This enum is a named one that has been declared already. */
5571 error ("redeclaration of %<enum %E%>", name);
5573 /* Completely replace its old definition.
5574 The old enumerators remain defined, however. */
5575 TYPE_VALUES (enumtype) = 0;
5578 enum_next_value = integer_zero_node;
5581 if (flag_short_enums)
5582 TYPE_PACKED (enumtype) = 1;
5587 /* After processing and defining all the values of an enumeration type,
5588 install their decls in the enumeration type and finish it off.
5589 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5590 and ATTRIBUTES are the specified attributes.
5591 Returns ENUMTYPE. */
5594 finish_enum (tree enumtype, tree values, tree attributes)
5597 tree minnode = 0, maxnode = 0;
5598 int precision, unsign;
5599 bool toplevel = (file_scope == current_scope);
5600 struct lang_type *lt;
5602 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5604 /* Calculate the maximum value of any enumerator in this type. */
5606 if (values == error_mark_node)
5607 minnode = maxnode = integer_zero_node;
5610 minnode = maxnode = TREE_VALUE (values);
5611 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5613 tree value = TREE_VALUE (pair);
5614 if (tree_int_cst_lt (maxnode, value))
5616 if (tree_int_cst_lt (value, minnode))
5621 /* Construct the final type of this enumeration. It is the same
5622 as one of the integral types - the narrowest one that fits, except
5623 that normally we only go as narrow as int - and signed iff any of
5624 the values are negative. */
5625 unsign = (tree_int_cst_sgn (minnode) >= 0);
5626 precision = MAX (min_precision (minnode, unsign),
5627 min_precision (maxnode, unsign));
5629 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5631 tem = c_common_type_for_size (precision, unsign);
5634 warning (0, "enumeration values exceed range of largest integer");
5635 tem = long_long_integer_type_node;
5639 tem = unsign ? unsigned_type_node : integer_type_node;
5641 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5642 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5643 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5644 TYPE_SIZE (enumtype) = 0;
5646 /* If the precision of the type was specific with an attribute and it
5647 was too small, give an error. Otherwise, use it. */
5648 if (TYPE_PRECISION (enumtype))
5650 if (precision > TYPE_PRECISION (enumtype))
5651 error ("specified mode too small for enumeral values");
5654 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5656 layout_type (enumtype);
5658 if (values != error_mark_node)
5660 /* Change the type of the enumerators to be the enum type. We
5661 need to do this irrespective of the size of the enum, for
5662 proper type checking. Replace the DECL_INITIALs of the
5663 enumerators, and the value slots of the list, with copies
5664 that have the enum type; they cannot be modified in place
5665 because they may be shared (e.g. integer_zero_node) Finally,
5666 change the purpose slots to point to the names of the decls. */
5667 for (pair = values; pair; pair = TREE_CHAIN (pair))
5669 tree enu = TREE_PURPOSE (pair);
5670 tree ini = DECL_INITIAL (enu);
5672 TREE_TYPE (enu) = enumtype;
5674 /* The ISO C Standard mandates enumerators to have type int,
5675 even though the underlying type of an enum type is
5676 unspecified. Here we convert any enumerators that fit in
5677 an int to type int, to avoid promotions to unsigned types
5678 when comparing integers with enumerators that fit in the
5679 int range. When -pedantic is given, build_enumerator()
5680 would have already taken care of those that don't fit. */
5681 if (int_fits_type_p (ini, integer_type_node))
5682 tem = integer_type_node;
5685 ini = convert (tem, ini);
5687 DECL_INITIAL (enu) = ini;
5688 TREE_PURPOSE (pair) = DECL_NAME (enu);
5689 TREE_VALUE (pair) = ini;
5692 TYPE_VALUES (enumtype) = values;
5695 /* Record the min/max values so that we can warn about bit-field
5696 enumerations that are too small for the values. */
5697 lt = GGC_CNEW (struct lang_type);
5698 lt->enum_min = minnode;
5699 lt->enum_max = maxnode;
5700 TYPE_LANG_SPECIFIC (enumtype) = lt;
5702 /* Fix up all variant types of this enum type. */
5703 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5705 if (tem == enumtype)
5707 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5708 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5709 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5710 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5711 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5712 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5713 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5714 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5715 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5716 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5717 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5720 /* Finish debugging output for this type. */
5721 rest_of_type_compilation (enumtype, toplevel);
5726 /* Build and install a CONST_DECL for one value of the
5727 current enumeration type (one that was begun with start_enum).
5728 Return a tree-list containing the CONST_DECL and its value.
5729 Assignment of sequential values by default is handled here. */
5732 build_enumerator (tree name, tree value)
5736 /* Validate and default VALUE. */
5740 /* Don't issue more errors for error_mark_node (i.e. an
5741 undeclared identifier) - just ignore the value expression. */
5742 if (value == error_mark_node)
5744 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5745 || TREE_CODE (value) != INTEGER_CST)
5747 error ("enumerator value for %qE is not an integer constant", name);
5752 value = default_conversion (value);
5753 constant_expression_warning (value);
5757 /* Default based on previous value. */
5758 /* It should no longer be possible to have NON_LVALUE_EXPR
5762 value = enum_next_value;
5764 error ("overflow in enumeration values");
5767 if (pedantic && !int_fits_type_p (value, integer_type_node))
5769 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5770 /* XXX This causes -pedantic to change the meaning of the program.
5771 Remove? -zw 2004-03-15 */
5772 value = convert (integer_type_node, value);
5775 /* Set basis for default for next value. */
5776 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5777 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5779 /* Now create a declaration for the enum value name. */
5781 type = TREE_TYPE (value);
5782 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5783 TYPE_PRECISION (integer_type_node)),
5784 (TYPE_PRECISION (type)
5785 >= TYPE_PRECISION (integer_type_node)
5786 && TYPE_UNSIGNED (type)));
5788 decl = build_decl (CONST_DECL, name, type);
5789 DECL_INITIAL (decl) = convert (type, value);
5792 return tree_cons (decl, value, NULL_TREE);
5796 /* Create the FUNCTION_DECL for a function definition.
5797 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5798 the declaration; they describe the function's name and the type it returns,
5799 but twisted together in a fashion that parallels the syntax of C.
5801 This function creates a binding context for the function body
5802 as well as setting up the FUNCTION_DECL in current_function_decl.
5804 Returns 1 on success. If the DECLARATOR is not suitable for a function
5805 (it defines a datum instead), we return 0, which tells
5806 yyparse to report a parse error. */
5809 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5812 tree decl1, old_decl;
5813 tree restype, resdecl;
5814 struct c_label_context_se *nstack_se;
5815 struct c_label_context_vm *nstack_vm;
5817 current_function_returns_value = 0; /* Assume, until we see it does. */
5818 current_function_returns_null = 0;
5819 current_function_returns_abnormally = 0;
5820 warn_about_return_type = 0;
5821 current_extern_inline = 0;
5822 c_switch_stack = NULL;
5824 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
5825 nstack_se->labels_def = NULL;
5826 nstack_se->labels_used = NULL;
5827 nstack_se->next = label_context_stack_se;
5828 label_context_stack_se = nstack_se;
5830 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
5831 nstack_vm->labels_def = NULL;
5832 nstack_vm->labels_used = NULL;
5833 nstack_vm->scope = 0;
5834 nstack_vm->next = label_context_stack_vm;
5835 label_context_stack_vm = nstack_vm;
5837 /* Indicate no valid break/continue context by setting these variables
5838 to some non-null, non-label value. We'll notice and emit the proper
5839 error message in c_finish_bc_stmt. */
5840 c_break_label = c_cont_label = size_zero_node;
5842 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5844 /* If the declarator is not suitable for a function definition,
5845 cause a syntax error. */
5848 label_context_stack_se = label_context_stack_se->next;
5849 label_context_stack_vm = label_context_stack_vm->next;
5853 decl_attributes (&decl1, attributes, 0);
5855 if (DECL_DECLARED_INLINE_P (decl1)
5856 && DECL_UNINLINABLE (decl1)
5857 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5858 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
5861 announce_function (decl1);
5863 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5865 error ("return type is an incomplete type");
5866 /* Make it return void instead. */
5868 = build_function_type (void_type_node,
5869 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5872 if (warn_about_return_type)
5873 pedwarn_c99 ("return type defaults to %<int%>");
5875 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5876 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5877 DECL_INITIAL (decl1) = error_mark_node;
5879 /* If this definition isn't a prototype and we had a prototype declaration
5880 before, copy the arg type info from that prototype. */
5881 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5882 current_function_prototype_locus = UNKNOWN_LOCATION;
5883 current_function_prototype_built_in = false;
5884 current_function_prototype_arg_types = NULL_TREE;
5885 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5887 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5888 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5889 TREE_TYPE (TREE_TYPE (old_decl))))
5891 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5893 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5894 current_function_prototype_built_in
5895 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
5896 current_function_prototype_arg_types
5897 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
5899 if (TREE_PUBLIC (decl1))
5901 /* If there is an external prototype declaration of this
5902 function, record its location but do not copy information
5903 to this decl. This may be an invisible declaration
5904 (built-in or in a scope which has finished) or simply
5905 have more refined argument types than any declaration
5907 struct c_binding *b;
5908 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
5909 if (B_IN_SCOPE (b, external_scope))
5913 tree ext_decl, ext_type;
5915 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
5916 if (TREE_CODE (ext_type) == FUNCTION_TYPE
5917 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5918 TREE_TYPE (ext_type)))
5920 current_function_prototype_locus
5921 = DECL_SOURCE_LOCATION (ext_decl);
5922 current_function_prototype_built_in
5923 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
5924 current_function_prototype_arg_types
5925 = TYPE_ARG_TYPES (ext_type);
5931 /* Optionally warn of old-fashioned def with no previous prototype. */
5932 if (warn_strict_prototypes
5933 && old_decl != error_mark_node
5934 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5935 && C_DECL_ISNT_PROTOTYPE (old_decl))
5936 warning (OPT_Wstrict_prototypes,
5937 "function declaration isn%'t a prototype");
5938 /* Optionally warn of any global def with no previous prototype. */
5939 else if (warn_missing_prototypes
5940 && old_decl != error_mark_node
5941 && TREE_PUBLIC (decl1)
5942 && !MAIN_NAME_P (DECL_NAME (decl1))
5943 && C_DECL_ISNT_PROTOTYPE (old_decl))
5944 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
5945 /* Optionally warn of any def with no previous prototype
5946 if the function has already been used. */
5947 else if (warn_missing_prototypes
5949 && old_decl != error_mark_node
5950 && TREE_USED (old_decl)
5951 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5952 warning (OPT_Wmissing_prototypes,
5953 "%q+D was used with no prototype before its definition", decl1);
5954 /* Optionally warn of any global def with no previous declaration. */
5955 else if (warn_missing_declarations
5956 && TREE_PUBLIC (decl1)
5958 && !MAIN_NAME_P (DECL_NAME (decl1)))
5959 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
5961 /* Optionally warn of any def with no previous declaration
5962 if the function has already been used. */
5963 else if (warn_missing_declarations
5965 && old_decl != error_mark_node
5966 && TREE_USED (old_decl)
5967 && C_DECL_IMPLICIT (old_decl))
5968 warning (OPT_Wmissing_declarations,
5969 "%q+D was used with no declaration before its definition", decl1);
5971 /* This is a definition, not a reference.
5972 So normally clear DECL_EXTERNAL.
5973 However, `extern inline' acts like a declaration
5974 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5975 DECL_EXTERNAL (decl1) = current_extern_inline;
5977 /* This function exists in static storage.
5978 (This does not mean `static' in the C sense!) */
5979 TREE_STATIC (decl1) = 1;
5981 /* A nested function is not global. */
5982 if (current_function_decl != 0)
5983 TREE_PUBLIC (decl1) = 0;
5985 /* This is the earliest point at which we might know the assembler
5986 name of the function. Thus, if it's set before this, die horribly. */
5987 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5989 /* If #pragma weak was used, mark the decl weak now. */
5990 if (current_scope == file_scope)
5991 maybe_apply_pragma_weak (decl1);
5993 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5994 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5999 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6000 != integer_type_node)
6001 pedwarn ("return type of %q+D is not %<int%>", decl1);
6003 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6004 args = TREE_CHAIN (args))
6006 tree type = args ? TREE_VALUE (args) : 0;
6008 if (type == void_type_node)
6015 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6016 pedwarn ("first argument of %q+D should be %<int%>", decl1);
6020 if (TREE_CODE (type) != POINTER_TYPE
6021 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6022 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6024 pedwarn ("second argument of %q+D should be %<char **%>",
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 ("third argument of %q+D should probably be "
6034 "%<char **%>", decl1);
6039 /* It is intentional that this message does not mention the third
6040 argument because it's only mentioned in an appendix of the
6042 if (argct > 0 && (argct < 2 || argct > 3))
6043 pedwarn ("%q+D takes only zero or two arguments", decl1);
6045 if (!TREE_PUBLIC (decl1))
6046 pedwarn ("%q+D is normally a non-static function", decl1);
6049 /* Record the decl so that the function name is defined.
6050 If we already have a decl for this name, and it is a FUNCTION_DECL,
6051 use the old decl. */
6053 current_function_decl = pushdecl (decl1);
6056 declare_parm_level ();
6058 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6059 /* Promote the value to int before returning it. */
6060 if (c_promoting_integer_type_p (restype))
6062 /* It retains unsignedness if not really getting wider. */
6063 if (TYPE_UNSIGNED (restype)
6064 && (TYPE_PRECISION (restype)
6065 == TYPE_PRECISION (integer_type_node)))
6066 restype = unsigned_type_node;
6068 restype = integer_type_node;
6071 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6072 DECL_ARTIFICIAL (resdecl) = 1;
6073 DECL_IGNORED_P (resdecl) = 1;
6074 DECL_RESULT (current_function_decl) = resdecl;
6076 start_fname_decls ();
6081 /* Subroutine of store_parm_decls which handles new-style function
6082 definitions (prototype format). The parms already have decls, so we
6083 need only record them as in effect and complain if any redundant
6084 old-style parm decls were written. */
6086 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6090 if (current_scope->bindings)
6092 error ("%Jold-style parameter declarations in prototyped "
6093 "function definition", fndecl);
6095 /* Get rid of the old-style declarations. */
6099 /* Don't issue this warning for nested functions, and don't issue this
6100 warning if we got here because ARG_INFO_TYPES was error_mark_node
6101 (this happens when a function definition has just an ellipsis in
6102 its parameter list). */
6103 else if (!in_system_header && !current_function_scope
6104 && arg_info->types != error_mark_node)
6105 warning (OPT_Wtraditional,
6106 "%Jtraditional C rejects ISO C style function definitions",
6109 /* Now make all the parameter declarations visible in the function body.
6110 We can bypass most of the grunt work of pushdecl. */
6111 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6113 DECL_CONTEXT (decl) = current_function_decl;
6114 if (DECL_NAME (decl))
6116 bind (DECL_NAME (decl), decl, current_scope,
6117 /*invisible=*/false, /*nested=*/false);
6118 if (!TREE_USED (decl))
6119 warn_if_shadowing (decl);
6122 error ("%Jparameter name omitted", decl);
6125 /* Record the parameter list in the function declaration. */
6126 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6128 /* Now make all the ancillary declarations visible, likewise. */
6129 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6131 DECL_CONTEXT (decl) = current_function_decl;
6132 if (DECL_NAME (decl))
6133 bind (DECL_NAME (decl), decl, current_scope,
6134 /*invisible=*/false, /*nested=*/false);
6137 /* And all the tag declarations. */
6138 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6139 if (TREE_PURPOSE (decl))
6140 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6141 /*invisible=*/false, /*nested=*/false);
6144 /* Subroutine of store_parm_decls which handles old-style function
6145 definitions (separate parameter list and declarations). */
6148 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6150 struct c_binding *b;
6151 tree parm, decl, last;
6152 tree parmids = arg_info->parms;
6153 struct pointer_set_t *seen_args = pointer_set_create ();
6155 if (!in_system_header)
6156 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6159 /* Match each formal parameter name with its declaration. Save each
6160 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6161 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6163 if (TREE_VALUE (parm) == 0)
6165 error ("%Jparameter name missing from parameter list", fndecl);
6166 TREE_PURPOSE (parm) = 0;
6170 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6171 if (b && B_IN_CURRENT_SCOPE (b))
6174 /* If we got something other than a PARM_DECL it is an error. */
6175 if (TREE_CODE (decl) != PARM_DECL)
6176 error ("%q+D declared as a non-parameter", decl);
6177 /* If the declaration is already marked, we have a duplicate
6178 name. Complain and ignore the duplicate. */
6179 else if (pointer_set_contains (seen_args, decl))
6181 error ("multiple parameters named %q+D", decl);
6182 TREE_PURPOSE (parm) = 0;
6185 /* If the declaration says "void", complain and turn it into
6187 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6189 error ("parameter %q+D declared with void type", decl);
6190 TREE_TYPE (decl) = integer_type_node;
6191 DECL_ARG_TYPE (decl) = integer_type_node;
6192 layout_decl (decl, 0);
6194 warn_if_shadowing (decl);
6196 /* If no declaration found, default to int. */
6199 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6200 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6201 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6203 warn_if_shadowing (decl);
6206 pedwarn ("type of %q+D defaults to %<int%>", decl);
6207 else if (extra_warnings)
6208 warning (OPT_Wextra, "type of %q+D defaults to %<int%>", decl);
6211 TREE_PURPOSE (parm) = decl;
6212 pointer_set_insert (seen_args, decl);
6215 /* Now examine the parms chain for incomplete declarations
6216 and declarations with no corresponding names. */
6218 for (b = current_scope->bindings; b; b = b->prev)
6221 if (TREE_CODE (parm) != PARM_DECL)
6224 if (TREE_TYPE (parm) != error_mark_node
6225 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6227 error ("parameter %q+D has incomplete type", parm);
6228 TREE_TYPE (parm) = error_mark_node;
6231 if (!pointer_set_contains (seen_args, parm))
6233 error ("declaration for parameter %q+D but no such parameter", parm);
6235 /* Pretend the parameter was not missing.
6236 This gets us to a standard state and minimizes
6237 further error messages. */
6238 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6242 /* Chain the declarations together in the order of the list of
6243 names. Store that chain in the function decl, replacing the
6244 list of names. Update the current scope to match. */
6245 DECL_ARGUMENTS (fndecl) = 0;
6247 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6248 if (TREE_PURPOSE (parm))
6250 if (parm && TREE_PURPOSE (parm))
6252 last = TREE_PURPOSE (parm);
6253 DECL_ARGUMENTS (fndecl) = last;
6255 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6256 if (TREE_PURPOSE (parm))
6258 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6259 last = TREE_PURPOSE (parm);
6261 TREE_CHAIN (last) = 0;
6264 pointer_set_destroy (seen_args);
6266 /* If there was a previous prototype,
6267 set the DECL_ARG_TYPE of each argument according to
6268 the type previously specified, and report any mismatches. */
6270 if (current_function_prototype_arg_types)
6273 for (parm = DECL_ARGUMENTS (fndecl),
6274 type = current_function_prototype_arg_types;
6275 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6276 != void_type_node));
6277 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6279 if (parm == 0 || type == 0
6280 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6282 if (current_function_prototype_built_in)
6283 warning (0, "number of arguments doesn%'t match "
6284 "built-in prototype");
6287 error ("number of arguments doesn%'t match prototype");
6288 error ("%Hprototype declaration",
6289 ¤t_function_prototype_locus);
6293 /* Type for passing arg must be consistent with that
6294 declared for the arg. ISO C says we take the unqualified
6295 type for parameters declared with qualified type. */
6296 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6297 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6299 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6300 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6302 /* Adjust argument to match prototype. E.g. a previous
6303 `int foo(float);' prototype causes
6304 `int foo(x) float x; {...}' to be treated like
6305 `int foo(float x) {...}'. This is particularly
6306 useful for argument types like uid_t. */
6307 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6309 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6310 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6311 && TYPE_PRECISION (TREE_TYPE (parm))
6312 < TYPE_PRECISION (integer_type_node))
6313 DECL_ARG_TYPE (parm) = integer_type_node;
6317 /* ??? Is it possible to get here with a
6318 built-in prototype or will it always have
6319 been diagnosed as conflicting with an
6320 old-style definition and discarded? */
6321 if (current_function_prototype_built_in)
6322 warning (0, "promoted argument %qD "
6323 "doesn%'t match built-in prototype", parm);
6326 pedwarn ("promoted argument %qD "
6327 "doesn%'t match prototype", parm);
6328 pedwarn ("%Hprototype declaration",
6329 ¤t_function_prototype_locus);
6335 if (current_function_prototype_built_in)
6336 warning (0, "argument %qD doesn%'t match "
6337 "built-in prototype", parm);
6340 error ("argument %qD doesn%'t match prototype", parm);
6341 error ("%Hprototype declaration",
6342 ¤t_function_prototype_locus);
6347 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6350 /* Otherwise, create a prototype that would match. */
6354 tree actual = 0, last = 0, type;
6356 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6358 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6360 TREE_CHAIN (last) = type;
6365 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6367 TREE_CHAIN (last) = type;
6371 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6372 of the type of this function, but we need to avoid having this
6373 affect the types of other similarly-typed functions, so we must
6374 first force the generation of an identical (but separate) type
6375 node for the relevant function type. The new node we create
6376 will be a variant of the main variant of the original function
6379 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6381 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6385 /* Store parameter declarations passed in ARG_INFO into the current
6386 function declaration. */
6389 store_parm_decls_from (struct c_arg_info *arg_info)
6391 current_function_arg_info = arg_info;
6392 store_parm_decls ();
6395 /* Store the parameter declarations into the current function declaration.
6396 This is called after parsing the parameter declarations, before
6397 digesting the body of the function.
6399 For an old-style definition, construct a prototype out of the old-style
6400 parameter declarations and inject it into the function's type. */
6403 store_parm_decls (void)
6405 tree fndecl = current_function_decl;
6408 /* The argument information block for FNDECL. */
6409 struct c_arg_info *arg_info = current_function_arg_info;
6410 current_function_arg_info = 0;
6412 /* True if this definition is written with a prototype. Note:
6413 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6414 list in a function definition as equivalent to (void) -- an
6415 empty argument list specifies the function has no parameters,
6416 but only (void) sets up a prototype for future calls. */
6417 proto = arg_info->types != 0;
6420 store_parm_decls_newstyle (fndecl, arg_info);
6422 store_parm_decls_oldstyle (fndecl, arg_info);
6424 /* The next call to push_scope will be a function body. */
6426 next_is_function_body = true;
6428 /* Write a record describing this function definition to the prototypes
6429 file (if requested). */
6431 gen_aux_info_record (fndecl, 1, 0, proto);
6433 /* Initialize the RTL code for the function. */
6434 allocate_struct_function (fndecl);
6436 /* Begin the statement tree for this function. */
6437 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6439 /* ??? Insert the contents of the pending sizes list into the function
6440 to be evaluated. The only reason left to have this is
6441 void foo(int n, int array[n++])
6442 because we throw away the array type in favor of a pointer type, and
6443 thus won't naturally see the SAVE_EXPR containing the increment. All
6444 other pending sizes would be handled by gimplify_parameters. */
6447 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6448 add_stmt (TREE_VALUE (t));
6451 /* Even though we're inside a function body, we still don't want to
6452 call expand_expr to calculate the size of a variable-sized array.
6453 We haven't necessarily assigned RTL to all variables yet, so it's
6454 not safe to try to expand expressions involving them. */
6455 cfun->x_dont_save_pending_sizes_p = 1;
6458 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6462 c_warn_unused_result_recursively (tree fndecl)
6464 struct cgraph_node *cgn;
6466 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6467 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6469 /* Finalize all nested functions now. */
6470 cgn = cgraph_node (fndecl);
6471 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6472 c_warn_unused_result_recursively (cgn->decl);
6475 /* Finish up a function declaration and compile that function
6476 all the way to assembler language output. The free the storage
6477 for the function definition.
6479 This is called after parsing the body of the function definition. */
6482 finish_function (void)
6484 tree fndecl = current_function_decl;
6486 label_context_stack_se = label_context_stack_se->next;
6487 label_context_stack_vm = label_context_stack_vm->next;
6489 if (TREE_CODE (fndecl) == FUNCTION_DECL
6490 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6492 tree args = DECL_ARGUMENTS (fndecl);
6493 for (; args; args = TREE_CHAIN (args))
6495 tree type = TREE_TYPE (args);
6496 if (INTEGRAL_TYPE_P (type)
6497 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6498 DECL_ARG_TYPE (args) = integer_type_node;
6502 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6503 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6505 /* Must mark the RESULT_DECL as being in this function. */
6507 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6508 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6510 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6512 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6513 != integer_type_node)
6515 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6516 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6518 pedwarn ("return type of %q+D is not %<int%>", fndecl);
6524 tree stmt = c_finish_return (integer_zero_node);
6525 #ifdef USE_MAPPED_LOCATION
6526 /* Hack. We don't want the middle-end to warn that this return
6527 is unreachable, so we mark its location as special. Using
6528 UNKNOWN_LOCATION has the problem that it gets clobbered in
6529 annotate_one_with_locus. A cleaner solution might be to
6530 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6532 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6534 /* Hack. We don't want the middle-end to warn that this
6535 return is unreachable, so put the statement on the
6537 annotate_with_file_line (stmt, input_filename, 0);
6543 /* Tie off the statement tree for this function. */
6544 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6546 finish_fname_decls ();
6548 /* Complain if there's just no return statement. */
6549 if (warn_return_type
6550 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6551 && !current_function_returns_value && !current_function_returns_null
6552 /* Don't complain if we are no-return. */
6553 && !current_function_returns_abnormally
6554 /* Don't warn for main(). */
6555 && !MAIN_NAME_P (DECL_NAME (fndecl))
6556 /* Or if they didn't actually specify a return type. */
6557 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6558 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6559 inline function, as we might never be compiled separately. */
6560 && DECL_INLINE (fndecl))
6562 warning (OPT_Wreturn_type,
6563 "no return statement in function returning non-void");
6564 TREE_NO_WARNING (fndecl) = 1;
6567 /* With just -Wextra, complain only if function returns both with
6568 and without a value. */
6570 && current_function_returns_value
6571 && current_function_returns_null)
6572 warning (OPT_Wextra, "this function may return with or without a value");
6574 /* Store the end of the function, so that we get good line number
6575 info for the epilogue. */
6576 cfun->function_end_locus = input_location;
6578 /* If we don't have ctors/dtors sections, and this is a static
6579 constructor or destructor, it must be recorded now. */
6580 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6581 && !targetm.have_ctors_dtors)
6582 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6583 if (DECL_STATIC_DESTRUCTOR (fndecl)
6584 && !targetm.have_ctors_dtors)
6585 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6587 /* Finalize the ELF visibility for the function. */
6588 c_determine_visibility (fndecl);
6590 /* Genericize before inlining. Delay genericizing nested functions
6591 until their parent function is genericized. Since finalizing
6592 requires GENERIC, delay that as well. */
6594 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6595 && !undef_nested_function)
6597 if (!decl_function_context (fndecl))
6599 c_genericize (fndecl);
6600 c_warn_unused_result_recursively (fndecl);
6602 /* ??? Objc emits functions after finalizing the compilation unit.
6603 This should be cleaned up later and this conditional removed. */
6604 if (cgraph_global_info_ready)
6606 c_expand_body (fndecl);
6610 cgraph_finalize_function (fndecl, false);
6614 /* Register this function with cgraph just far enough to get it
6615 added to our parent's nested function list. Handy, since the
6616 C front end doesn't have such a list. */
6617 (void) cgraph_node (fndecl);
6621 if (!decl_function_context (fndecl))
6622 undef_nested_function = false;
6624 /* We're leaving the context of this function, so zap cfun.
6625 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6626 tree_rest_of_compilation. */
6628 current_function_decl = NULL;
6631 /* Generate the RTL for the body of FNDECL. */
6634 c_expand_body (tree fndecl)
6637 if (!DECL_INITIAL (fndecl)
6638 || DECL_INITIAL (fndecl) == error_mark_node)
6641 tree_rest_of_compilation (fndecl);
6643 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6644 && targetm.have_ctors_dtors)
6645 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6646 DEFAULT_INIT_PRIORITY);
6647 if (DECL_STATIC_DESTRUCTOR (fndecl)
6648 && targetm.have_ctors_dtors)
6649 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6650 DEFAULT_INIT_PRIORITY);
6653 /* Check the declarations given in a for-loop for satisfying the C99
6656 check_for_loop_decls (void)
6658 struct c_binding *b;
6662 /* If we get here, declarations have been used in a for loop without
6663 the C99 for loop scope. This doesn't make much sense, so don't
6665 error ("%<for%> loop initial declaration used outside C99 mode");
6668 /* C99 subclause 6.8.5 paragraph 3:
6670 [#3] The declaration part of a for statement shall only
6671 declare identifiers for objects having storage class auto or
6674 It isn't clear whether, in this sentence, "identifiers" binds to
6675 "shall only declare" or to "objects" - that is, whether all identifiers
6676 declared must be identifiers for objects, or whether the restriction
6677 only applies to those that are. (A question on this in comp.std.c
6678 in November 2000 received no answer.) We implement the strictest
6679 interpretation, to avoid creating an extension which later causes
6682 for (b = current_scope->bindings; b; b = b->prev)
6685 tree decl = b->decl;
6690 switch (TREE_CODE (decl))
6693 if (TREE_STATIC (decl))
6694 error ("declaration of static variable %q+D in %<for%> loop "
6695 "initial declaration", decl);
6696 else if (DECL_EXTERNAL (decl))
6697 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6698 "initial declaration", decl);
6702 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6706 error ("%<union %E%> declared in %<for%> loop initial declaration",
6710 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6714 error ("declaration of non-variable %q+D in %<for%> loop "
6715 "initial declaration", decl);
6720 /* Save and reinitialize the variables
6721 used during compilation of a C function. */
6724 c_push_function_context (struct function *f)
6726 struct language_function *p;
6727 p = GGC_NEW (struct language_function);
6730 p->base.x_stmt_tree = c_stmt_tree;
6731 p->x_break_label = c_break_label;
6732 p->x_cont_label = c_cont_label;
6733 p->x_switch_stack = c_switch_stack;
6734 p->arg_info = current_function_arg_info;
6735 p->returns_value = current_function_returns_value;
6736 p->returns_null = current_function_returns_null;
6737 p->returns_abnormally = current_function_returns_abnormally;
6738 p->warn_about_return_type = warn_about_return_type;
6739 p->extern_inline = current_extern_inline;
6742 /* Restore the variables used during compilation of a C function. */
6745 c_pop_function_context (struct function *f)
6747 struct language_function *p = f->language;
6749 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6750 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6752 /* Stop pointing to the local nodes about to be freed. */
6753 /* But DECL_INITIAL must remain nonzero so we know this
6754 was an actual function definition. */
6755 DECL_INITIAL (current_function_decl) = error_mark_node;
6756 DECL_ARGUMENTS (current_function_decl) = 0;
6759 c_stmt_tree = p->base.x_stmt_tree;
6760 c_break_label = p->x_break_label;
6761 c_cont_label = p->x_cont_label;
6762 c_switch_stack = p->x_switch_stack;
6763 current_function_arg_info = p->arg_info;
6764 current_function_returns_value = p->returns_value;
6765 current_function_returns_null = p->returns_null;
6766 current_function_returns_abnormally = p->returns_abnormally;
6767 warn_about_return_type = p->warn_about_return_type;
6768 current_extern_inline = p->extern_inline;
6773 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6776 c_dup_lang_specific_decl (tree decl)
6778 struct lang_decl *ld;
6780 if (!DECL_LANG_SPECIFIC (decl))
6783 ld = GGC_NEW (struct lang_decl);
6784 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6785 DECL_LANG_SPECIFIC (decl) = ld;
6788 /* The functions below are required for functionality of doing
6789 function at once processing in the C front end. Currently these
6790 functions are not called from anywhere in the C front end, but as
6791 these changes continue, that will change. */
6793 /* Returns the stmt_tree (if any) to which statements are currently
6794 being added. If there is no active statement-tree, NULL is
6798 current_stmt_tree (void)
6800 return &c_stmt_tree;
6803 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6807 anon_aggr_type_p (tree ARG_UNUSED (node))
6812 /* Return the global value of T as a symbol. */
6815 identifier_global_value (tree t)
6817 struct c_binding *b;
6819 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6820 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6826 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6827 otherwise the name is found in ridpointers from RID_INDEX. */
6830 record_builtin_type (enum rid rid_index, const char *name, tree type)
6834 id = ridpointers[(int) rid_index];
6836 id = get_identifier (name);
6837 decl = build_decl (TYPE_DECL, id, type);
6839 if (debug_hooks->type_decl)
6840 debug_hooks->type_decl (decl, false);
6843 /* Build the void_list_node (void_type_node having been created). */
6845 build_void_list_node (void)
6847 tree t = build_tree_list (NULL_TREE, void_type_node);
6851 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6854 build_c_parm (struct c_declspecs *specs, tree attrs,
6855 struct c_declarator *declarator)
6857 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6860 ret->declarator = declarator;
6864 /* Return a declarator with nested attributes. TARGET is the inner
6865 declarator to which these attributes apply. ATTRS are the
6868 struct c_declarator *
6869 build_attrs_declarator (tree attrs, struct c_declarator *target)
6871 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6872 ret->kind = cdk_attrs;
6873 ret->declarator = target;
6874 ret->u.attrs = attrs;
6878 /* Return a declarator for a function with arguments specified by ARGS
6879 and return type specified by TARGET. */
6881 struct c_declarator *
6882 build_function_declarator (struct c_arg_info *args,
6883 struct c_declarator *target)
6885 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6886 ret->kind = cdk_function;
6887 ret->declarator = target;
6888 ret->u.arg_info = args;
6892 /* Return a declarator for the identifier IDENT (which may be
6893 NULL_TREE for an abstract declarator). */
6895 struct c_declarator *
6896 build_id_declarator (tree ident)
6898 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6900 ret->declarator = 0;
6902 /* Default value - may get reset to a more precise location. */
6903 ret->id_loc = input_location;
6907 /* Return something to represent absolute declarators containing a *.
6908 TARGET is the absolute declarator that the * contains.
6909 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6910 to apply to the pointer type. */
6912 struct c_declarator *
6913 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6914 struct c_declarator *target)
6918 struct c_declarator *itarget = target;
6919 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6920 if (type_quals_attrs)
6922 attrs = type_quals_attrs->attrs;
6923 quals = quals_from_declspecs (type_quals_attrs);
6924 if (attrs != NULL_TREE)
6925 itarget = build_attrs_declarator (attrs, target);
6927 ret->kind = cdk_pointer;
6928 ret->declarator = itarget;
6929 ret->u.pointer_quals = quals;
6933 /* Return a pointer to a structure for an empty list of declaration
6936 struct c_declspecs *
6937 build_null_declspecs (void)
6939 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6943 ret->typespec_word = cts_none;
6944 ret->storage_class = csc_none;
6945 ret->declspecs_seen_p = false;
6946 ret->type_seen_p = false;
6947 ret->non_sc_seen_p = false;
6948 ret->typedef_p = false;
6949 ret->tag_defined_p = false;
6950 ret->explicit_signed_p = false;
6951 ret->deprecated_p = false;
6952 ret->default_int_p = false;
6953 ret->long_p = false;
6954 ret->long_long_p = false;
6955 ret->short_p = false;
6956 ret->signed_p = false;
6957 ret->unsigned_p = false;
6958 ret->complex_p = false;
6959 ret->inline_p = false;
6960 ret->thread_p = false;
6961 ret->const_p = false;
6962 ret->volatile_p = false;
6963 ret->restrict_p = false;
6967 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6970 struct c_declspecs *
6971 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6975 specs->non_sc_seen_p = true;
6976 specs->declspecs_seen_p = true;
6977 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6978 && C_IS_RESERVED_WORD (qual));
6979 i = C_RID_CODE (qual);
6983 dupe = specs->const_p;
6984 specs->const_p = true;
6987 dupe = specs->volatile_p;
6988 specs->volatile_p = true;
6991 dupe = specs->restrict_p;
6992 specs->restrict_p = true;
6997 if (dupe && pedantic && !flag_isoc99)
6998 pedwarn ("duplicate %qE", qual);
7002 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7005 struct c_declspecs *
7006 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7008 tree type = spec.spec;
7009 specs->non_sc_seen_p = true;
7010 specs->declspecs_seen_p = true;
7011 specs->type_seen_p = true;
7012 if (TREE_DEPRECATED (type))
7013 specs->deprecated_p = true;
7015 /* Handle type specifier keywords. */
7016 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
7018 enum rid i = C_RID_CODE (type);
7021 error ("two or more data types in declaration specifiers");
7024 if ((int) i <= (int) RID_LAST_MODIFIER)
7026 /* "long", "short", "signed", "unsigned" or "_Complex". */
7031 if (specs->long_long_p)
7033 error ("%<long long long%> is too long for GCC");
7038 if (specs->typespec_word == cts_double)
7040 error ("both %<long long%> and %<double%> in "
7041 "declaration specifiers");
7044 if (pedantic && !flag_isoc99 && !in_system_header
7046 pedwarn ("ISO C90 does not support %<long long%>");
7047 specs->long_long_p = 1;
7051 error ("both %<long%> and %<short%> in "
7052 "declaration specifiers");
7053 else if (specs->typespec_word == cts_void)
7054 error ("both %<long%> and %<void%> in "
7055 "declaration specifiers");
7056 else if (specs->typespec_word == cts_bool)
7057 error ("both %<long%> and %<_Bool%> in "
7058 "declaration specifiers");
7059 else if (specs->typespec_word == cts_char)
7060 error ("both %<long%> and %<char%> in "
7061 "declaration specifiers");
7062 else if (specs->typespec_word == cts_float)
7063 error ("both %<long%> and %<float%> in "
7064 "declaration specifiers");
7066 specs->long_p = true;
7069 dupe = specs->short_p;
7071 error ("both %<long%> and %<short%> in "
7072 "declaration specifiers");
7073 else if (specs->typespec_word == cts_void)
7074 error ("both %<short%> and %<void%> in "
7075 "declaration specifiers");
7076 else if (specs->typespec_word == cts_bool)
7077 error ("both %<short%> and %<_Bool%> in "
7078 "declaration specifiers");
7079 else if (specs->typespec_word == cts_char)
7080 error ("both %<short%> and %<char%> in "
7081 "declaration specifiers");
7082 else if (specs->typespec_word == cts_float)
7083 error ("both %<short%> and %<float%> in "
7084 "declaration specifiers");
7085 else if (specs->typespec_word == cts_double)
7086 error ("both %<short%> and %<double%> in "
7087 "declaration specifiers");
7089 specs->short_p = true;
7092 dupe = specs->signed_p;
7093 if (specs->unsigned_p)
7094 error ("both %<signed%> and %<unsigned%> in "
7095 "declaration specifiers");
7096 else if (specs->typespec_word == cts_void)
7097 error ("both %<signed%> and %<void%> in "
7098 "declaration specifiers");
7099 else if (specs->typespec_word == cts_bool)
7100 error ("both %<signed%> and %<_Bool%> in "
7101 "declaration specifiers");
7102 else if (specs->typespec_word == cts_float)
7103 error ("both %<signed%> and %<float%> in "
7104 "declaration specifiers");
7105 else if (specs->typespec_word == cts_double)
7106 error ("both %<signed%> and %<double%> in "
7107 "declaration specifiers");
7109 specs->signed_p = true;
7112 dupe = specs->unsigned_p;
7113 if (specs->signed_p)
7114 error ("both %<signed%> and %<unsigned%> in "
7115 "declaration specifiers");
7116 else if (specs->typespec_word == cts_void)
7117 error ("both %<unsigned%> and %<void%> in "
7118 "declaration specifiers");
7119 else if (specs->typespec_word == cts_bool)
7120 error ("both %<unsigned%> and %<_Bool%> in "
7121 "declaration specifiers");
7122 else if (specs->typespec_word == cts_float)
7123 error ("both %<unsigned%> and %<float%> in "
7124 "declaration specifiers");
7125 else if (specs->typespec_word == cts_double)
7126 error ("both %<unsigned%> and %<double%> in "
7127 "declaration specifiers");
7129 specs->unsigned_p = true;
7132 dupe = specs->complex_p;
7133 if (pedantic && !flag_isoc99 && !in_system_header)
7134 pedwarn ("ISO C90 does not support complex types");
7135 if (specs->typespec_word == cts_void)
7136 error ("both %<complex%> and %<void%> in "
7137 "declaration specifiers");
7138 else if (specs->typespec_word == cts_bool)
7139 error ("both %<complex%> and %<_Bool%> in "
7140 "declaration specifiers");
7142 specs->complex_p = true;
7149 error ("duplicate %qE", type);
7155 /* "void", "_Bool", "char", "int", "float" or "double". */
7156 if (specs->typespec_word != cts_none)
7158 error ("two or more data types in declaration specifiers");
7165 error ("both %<long%> and %<void%> in "
7166 "declaration specifiers");
7167 else if (specs->short_p)
7168 error ("both %<short%> and %<void%> in "
7169 "declaration specifiers");
7170 else if (specs->signed_p)
7171 error ("both %<signed%> and %<void%> in "
7172 "declaration specifiers");
7173 else if (specs->unsigned_p)
7174 error ("both %<unsigned%> and %<void%> in "
7175 "declaration specifiers");
7176 else if (specs->complex_p)
7177 error ("both %<complex%> and %<void%> in "
7178 "declaration specifiers");
7180 specs->typespec_word = cts_void;
7184 error ("both %<long%> and %<_Bool%> in "
7185 "declaration specifiers");
7186 else if (specs->short_p)
7187 error ("both %<short%> and %<_Bool%> in "
7188 "declaration specifiers");
7189 else if (specs->signed_p)
7190 error ("both %<signed%> and %<_Bool%> in "
7191 "declaration specifiers");
7192 else if (specs->unsigned_p)
7193 error ("both %<unsigned%> and %<_Bool%> in "
7194 "declaration specifiers");
7195 else if (specs->complex_p)
7196 error ("both %<complex%> and %<_Bool%> in "
7197 "declaration specifiers");
7199 specs->typespec_word = cts_bool;
7203 error ("both %<long%> and %<char%> in "
7204 "declaration specifiers");
7205 else if (specs->short_p)
7206 error ("both %<short%> and %<char%> in "
7207 "declaration specifiers");
7209 specs->typespec_word = cts_char;
7212 specs->typespec_word = cts_int;
7216 error ("both %<long%> and %<float%> in "
7217 "declaration specifiers");
7218 else if (specs->short_p)
7219 error ("both %<short%> and %<float%> in "
7220 "declaration specifiers");
7221 else if (specs->signed_p)
7222 error ("both %<signed%> and %<float%> in "
7223 "declaration specifiers");
7224 else if (specs->unsigned_p)
7225 error ("both %<unsigned%> and %<float%> in "
7226 "declaration specifiers");
7228 specs->typespec_word = cts_float;
7231 if (specs->long_long_p)
7232 error ("both %<long long%> and %<double%> in "
7233 "declaration specifiers");
7234 else if (specs->short_p)
7235 error ("both %<short%> and %<double%> in "
7236 "declaration specifiers");
7237 else if (specs->signed_p)
7238 error ("both %<signed%> and %<double%> in "
7239 "declaration specifiers");
7240 else if (specs->unsigned_p)
7241 error ("both %<unsigned%> and %<double%> in "
7242 "declaration specifiers");
7244 specs->typespec_word = cts_double;
7247 /* ObjC reserved word "id", handled below. */
7253 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7254 form of ObjC type, cases such as "int" and "long" being handled
7255 above), a TYPE (struct, union, enum and typeof specifiers) or an
7256 ERROR_MARK. In none of these cases may there have previously
7257 been any type specifiers. */
7258 if (specs->type || specs->typespec_word != cts_none
7259 || specs->long_p || specs->short_p || specs->signed_p
7260 || specs->unsigned_p || specs->complex_p)
7261 error ("two or more data types in declaration specifiers");
7262 else if (TREE_CODE (type) == TYPE_DECL)
7264 if (TREE_TYPE (type) == error_mark_node)
7265 ; /* Allow the type to default to int to avoid cascading errors. */
7268 specs->type = TREE_TYPE (type);
7269 specs->decl_attr = DECL_ATTRIBUTES (type);
7270 specs->typedef_p = true;
7271 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7274 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7276 tree t = lookup_name (type);
7277 if (!t || TREE_CODE (t) != TYPE_DECL)
7278 error ("%qE fails to be a typedef or built in type", type);
7279 else if (TREE_TYPE (t) == error_mark_node)
7282 specs->type = TREE_TYPE (t);
7284 else if (TREE_CODE (type) != ERROR_MARK)
7286 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7287 specs->tag_defined_p = true;
7288 if (spec.kind == ctsk_typeof)
7289 specs->typedef_p = true;
7296 /* Add the storage class specifier or function specifier SCSPEC to the
7297 declaration specifiers SPECS, returning SPECS. */
7299 struct c_declspecs *
7300 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7303 enum c_storage_class n = csc_none;
7305 specs->declspecs_seen_p = true;
7306 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7307 && C_IS_RESERVED_WORD (scspec));
7308 i = C_RID_CODE (scspec);
7309 if (extra_warnings && specs->non_sc_seen_p)
7310 warning (OPT_Wextra, "%qE is not at beginning of declaration", scspec);
7314 /* C99 permits duplicate inline. Although of doubtful utility,
7315 it seems simplest to permit it in gnu89 mode as well, as
7316 there is also little utility in maintaining this as a
7317 difference between gnu89 and C99 inline. */
7319 specs->inline_p = true;
7322 dupe = specs->thread_p;
7323 if (specs->storage_class == csc_auto)
7324 error ("%<__thread%> used with %<auto%>");
7325 else if (specs->storage_class == csc_register)
7326 error ("%<__thread%> used with %<register%>");
7327 else if (specs->storage_class == csc_typedef)
7328 error ("%<__thread%> used with %<typedef%>");
7330 specs->thread_p = true;
7337 /* Diagnose "__thread extern". */
7338 if (specs->thread_p)
7339 error ("%<__thread%> before %<extern%>");
7346 /* Diagnose "__thread static". */
7347 if (specs->thread_p)
7348 error ("%<__thread%> before %<static%>");
7356 if (n != csc_none && n == specs->storage_class)
7359 error ("duplicate %qE", scspec);
7362 if (specs->storage_class != csc_none && n != specs->storage_class)
7364 error ("multiple storage classes in declaration specifiers");
7368 specs->storage_class = n;
7369 if (n != csc_extern && n != csc_static && specs->thread_p)
7371 error ("%<__thread%> used with %qE", scspec);
7372 specs->thread_p = false;
7379 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7382 struct c_declspecs *
7383 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7385 specs->attrs = chainon (attrs, specs->attrs);
7386 specs->declspecs_seen_p = true;
7390 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7391 specifiers with any other type specifier to determine the resulting
7392 type. This is where ISO C checks on complex types are made, since
7393 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7396 struct c_declspecs *
7397 finish_declspecs (struct c_declspecs *specs)
7399 /* If a type was specified as a whole, we have no modifiers and are
7401 if (specs->type != NULL_TREE)
7403 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7404 && !specs->signed_p && !specs->unsigned_p
7405 && !specs->complex_p);
7409 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7410 has been specified, treat it as "int" unless "_Complex" is
7411 present and there are no other specifiers. If we just have
7412 "_Complex", it is equivalent to "_Complex double", but e.g.
7413 "_Complex short" is equivalent to "_Complex short int". */
7414 if (specs->typespec_word == cts_none)
7416 if (specs->long_p || specs->short_p
7417 || specs->signed_p || specs->unsigned_p)
7419 specs->typespec_word = cts_int;
7421 else if (specs->complex_p)
7423 specs->typespec_word = cts_double;
7425 pedwarn ("ISO C does not support plain %<complex%> meaning "
7426 "%<double complex%>");
7430 specs->typespec_word = cts_int;
7431 specs->default_int_p = true;
7432 /* We don't diagnose this here because grokdeclarator will
7433 give more specific diagnostics according to whether it is
7434 a function definition. */
7438 /* If "signed" was specified, record this to distinguish "int" and
7439 "signed int" in the case of a bit-field with
7440 -funsigned-bitfields. */
7441 specs->explicit_signed_p = specs->signed_p;
7443 /* Now compute the actual type. */
7444 switch (specs->typespec_word)
7447 gcc_assert (!specs->long_p && !specs->short_p
7448 && !specs->signed_p && !specs->unsigned_p
7449 && !specs->complex_p);
7450 specs->type = void_type_node;
7453 gcc_assert (!specs->long_p && !specs->short_p
7454 && !specs->signed_p && !specs->unsigned_p
7455 && !specs->complex_p);
7456 specs->type = boolean_type_node;
7459 gcc_assert (!specs->long_p && !specs->short_p);
7460 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7461 if (specs->signed_p)
7462 specs->type = signed_char_type_node;
7463 else if (specs->unsigned_p)
7464 specs->type = unsigned_char_type_node;
7466 specs->type = char_type_node;
7467 if (specs->complex_p)
7470 pedwarn ("ISO C does not support complex integer types");
7471 specs->type = build_complex_type (specs->type);
7475 gcc_assert (!(specs->long_p && specs->short_p));
7476 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7477 if (specs->long_long_p)
7478 specs->type = (specs->unsigned_p
7479 ? long_long_unsigned_type_node
7480 : long_long_integer_type_node);
7481 else if (specs->long_p)
7482 specs->type = (specs->unsigned_p
7483 ? long_unsigned_type_node
7484 : long_integer_type_node);
7485 else if (specs->short_p)
7486 specs->type = (specs->unsigned_p
7487 ? short_unsigned_type_node
7488 : short_integer_type_node);
7490 specs->type = (specs->unsigned_p
7491 ? unsigned_type_node
7492 : integer_type_node);
7493 if (specs->complex_p)
7496 pedwarn ("ISO C does not support complex integer types");
7497 specs->type = build_complex_type (specs->type);
7501 gcc_assert (!specs->long_p && !specs->short_p
7502 && !specs->signed_p && !specs->unsigned_p);
7503 specs->type = (specs->complex_p
7504 ? complex_float_type_node
7508 gcc_assert (!specs->long_long_p && !specs->short_p
7509 && !specs->signed_p && !specs->unsigned_p);
7512 specs->type = (specs->complex_p
7513 ? complex_long_double_type_node
7514 : long_double_type_node);
7518 specs->type = (specs->complex_p
7519 ? complex_double_type_node
7520 : double_type_node);
7530 /* Synthesize a function which calls all the global ctors or global
7531 dtors in this file. This is only used for targets which do not
7532 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7534 build_cdtor (int method_type, tree cdtors)
7541 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7542 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7545 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7548 /* A subroutine of c_write_global_declarations. Perform final processing
7549 on one file scope's declarations (or the external scope's declarations),
7553 c_write_global_declarations_1 (tree globals)
7558 /* Process the decls in the order they were written. */
7559 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7561 /* Check for used but undefined static functions using the C
7562 standard's definition of "used", and set TREE_NO_WARNING so
7563 that check_global_declarations doesn't repeat the check. */
7564 if (TREE_CODE (decl) == FUNCTION_DECL
7565 && DECL_INITIAL (decl) == 0
7566 && DECL_EXTERNAL (decl)
7567 && !TREE_PUBLIC (decl)
7568 && C_DECL_USED (decl))
7570 pedwarn ("%q+F used but never defined", decl);
7571 TREE_NO_WARNING (decl) = 1;
7574 wrapup_global_declaration_1 (decl);
7580 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7581 reconsider |= wrapup_global_declaration_2 (decl);
7585 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7586 check_global_declaration_1 (decl);
7589 /* A subroutine of c_write_global_declarations Emit debug information for each
7590 of the declarations in GLOBALS. */
7593 c_write_global_declarations_2 (tree globals)
7597 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
7598 debug_hooks->global_decl (decl);
7601 /* Preserve the external declarations scope across a garbage collect. */
7602 static GTY(()) tree ext_block;
7605 c_write_global_declarations (void)
7609 /* We don't want to do this if generating a PCH. */
7613 /* Don't waste time on further processing if -fsyntax-only or we've
7614 encountered errors. */
7615 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7618 /* Close the external scope. */
7619 ext_block = pop_scope ();
7621 gcc_assert (!current_scope);
7625 tree tmp = BLOCK_VARS (ext_block);
7627 FILE * stream = dump_begin (TDI_tu, &flags);
7630 dump_node (tmp, flags & ~TDF_SLIM, stream);
7631 dump_end (TDI_tu, stream);
7635 /* Process all file scopes in this compilation, and the external_scope,
7636 through wrapup_global_declarations and check_global_declarations. */
7637 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7638 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7639 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7641 /* Generate functions to call static constructors and destructors
7642 for targets that do not support .ctors/.dtors sections. These
7643 functions have magic names which are detected by collect2. */
7644 build_cdtor ('I', static_ctors); static_ctors = 0;
7645 build_cdtor ('D', static_dtors); static_dtors = 0;
7647 /* We're done parsing; proceed to optimize and emit assembly.
7648 FIXME: shouldn't be the front end's responsibility to call this. */
7651 /* After cgraph has had a chance to emit everything that's going to
7652 be emitted, output debug information for globals. */
7653 if (errorcount == 0 && sorrycount == 0)
7655 timevar_push (TV_SYMOUT);
7656 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7657 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
7658 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
7659 timevar_pop (TV_SYMOUT);
7665 #include "gt-c-decl.h"