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 && !DECL_IN_SYSTEM_HEADER (p)
808 && !DECL_ARTIFICIAL (p)
809 && scope != file_scope
810 && scope != external_scope)
811 warning (OPT_Wunused_variable, "unused variable %q+D", p);
815 error ("type of array %q+D completed incompatibly with"
816 " implicit initialization", p);
823 /* All of these go in BLOCK_VARS, but only if this is the
824 binding in the home scope. */
827 TREE_CHAIN (p) = BLOCK_VARS (block);
828 BLOCK_VARS (block) = p;
830 /* If this is the file scope, and we are processing more
831 than one translation unit in this compilation, set
832 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
833 This makes same_translation_unit_p work, and causes
834 static declarations to be given disambiguating suffixes. */
835 if (scope == file_scope && num_in_fnames > 1)
837 DECL_CONTEXT (p) = context;
838 if (TREE_CODE (p) == TYPE_DECL)
839 set_type_context (TREE_TYPE (p), context);
843 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
844 already been put there by store_parm_decls. Unused-
845 parameter warnings are handled by function.c.
846 error_mark_node obviously does not go in BLOCK_VARS and
847 does not get unused-variable warnings. */
850 /* It is possible for a decl not to have a name. We get
851 here with b->id NULL in this case. */
854 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
855 I_SYMBOL_BINDING (b->id) = b->shadowed;
856 if (b->shadowed && b->shadowed->type)
857 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
867 /* Dispose of the block that we just made inside some higher level. */
868 if ((scope->function_body || scope == file_scope) && context)
870 DECL_INITIAL (context) = block;
871 BLOCK_SUPERCONTEXT (block) = context;
873 else if (scope->outer)
876 SCOPE_LIST_APPEND (scope->outer, blocks, block);
877 /* If we did not make a block for the scope just exited, any
878 blocks made for inner scopes must be carried forward so they
879 will later become subblocks of something else. */
880 else if (scope->blocks)
881 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
884 /* Pop the current scope, and free the structure for reuse. */
885 current_scope = scope->outer;
886 if (scope->function_body)
887 current_function_scope = scope->outer_function;
889 memset (scope, 0, sizeof (struct c_scope));
890 scope->outer = scope_freelist;
891 scope_freelist = scope;
897 push_file_scope (void)
905 file_scope = current_scope;
907 start_fname_decls ();
909 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
910 bind (DECL_NAME (decl), decl, file_scope,
911 /*invisible=*/false, /*nested=*/true);
915 pop_file_scope (void)
917 /* In case there were missing closebraces, get us back to the global
919 while (current_scope != file_scope)
922 /* __FUNCTION__ is defined at file scope (""). This
923 call may not be necessary as my tests indicate it
924 still works without it. */
925 finish_fname_decls ();
927 /* This is the point to write out a PCH if we're doing that.
928 In that case we do not want to do anything else. */
931 c_common_write_pch ();
935 /* Pop off the file scope and close this translation unit. */
939 maybe_apply_pending_pragma_weaks ();
940 cgraph_finalize_compilation_unit ();
943 /* Insert BLOCK at the end of the list of subblocks of the current
944 scope. This is used when a BIND_EXPR is expanded, to handle the
945 BLOCK node inside the BIND_EXPR. */
948 insert_block (tree block)
950 TREE_USED (block) = 1;
951 SCOPE_LIST_APPEND (current_scope, blocks, block);
954 /* Push a definition or a declaration of struct, union or enum tag "name".
955 "type" should be the type node.
956 We assume that the tag "name" is not already defined.
958 Note that the definition may really be just a forward reference.
959 In that case, the TYPE_SIZE will be zero. */
962 pushtag (tree name, tree type)
964 /* Record the identifier as the type's name if it has none. */
965 if (name && !TYPE_NAME (type))
966 TYPE_NAME (type) = name;
967 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
969 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
970 tagged type we just added to the current scope. This fake
971 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
972 to output a representation of a tagged type, and it also gives
973 us a convenient place to record the "scope start" address for the
976 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
978 /* An approximation for now, so we can tell this is a function-scope tag.
979 This will be updated in pop_scope. */
980 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
983 /* Subroutine of compare_decls. Allow harmless mismatches in return
984 and argument types provided that the type modes match. This function
985 return a unified type given a suitable match, and 0 otherwise. */
988 match_builtin_function_types (tree newtype, tree oldtype)
990 tree newrettype, oldrettype;
991 tree newargs, oldargs;
992 tree trytype, tryargs;
994 /* Accept the return type of the new declaration if same modes. */
995 oldrettype = TREE_TYPE (oldtype);
996 newrettype = TREE_TYPE (newtype);
998 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1001 oldargs = TYPE_ARG_TYPES (oldtype);
1002 newargs = TYPE_ARG_TYPES (newtype);
1005 while (oldargs || newargs)
1009 || !TREE_VALUE (oldargs)
1010 || !TREE_VALUE (newargs)
1011 || TYPE_MODE (TREE_VALUE (oldargs))
1012 != TYPE_MODE (TREE_VALUE (newargs)))
1015 oldargs = TREE_CHAIN (oldargs);
1016 newargs = TREE_CHAIN (newargs);
1019 trytype = build_function_type (newrettype, tryargs);
1020 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1023 /* Subroutine of diagnose_mismatched_decls. Check for function type
1024 mismatch involving an empty arglist vs a nonempty one and give clearer
1027 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1028 tree newtype, tree oldtype)
1032 if (TREE_CODE (olddecl) != FUNCTION_DECL
1033 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1034 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1036 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1039 t = TYPE_ARG_TYPES (oldtype);
1041 t = TYPE_ARG_TYPES (newtype);
1042 for (; t; t = TREE_CHAIN (t))
1044 tree type = TREE_VALUE (t);
1046 if (TREE_CHAIN (t) == 0
1047 && TYPE_MAIN_VARIANT (type) != void_type_node)
1049 inform ("a parameter list with an ellipsis can%'t match "
1050 "an empty parameter name list declaration");
1054 if (c_type_promotes_to (type) != type)
1056 inform ("an argument type that has a default promotion can%'t match "
1057 "an empty parameter name list declaration");
1063 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1064 old-style function definition, NEWDECL is a prototype declaration.
1065 Diagnose inconsistencies in the argument list. Returns TRUE if
1066 the prototype is compatible, FALSE if not. */
1068 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1070 tree newargs, oldargs;
1073 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1075 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1076 newargs = TYPE_ARG_TYPES (newtype);
1081 tree oldargtype = TYPE_MAIN_VARIANT (TREE_VALUE (oldargs));
1082 tree newargtype = TYPE_MAIN_VARIANT (TREE_VALUE (newargs));
1084 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1087 /* Reaching the end of just one list means the two decls don't
1088 agree on the number of arguments. */
1089 if (END_OF_ARGLIST (oldargtype))
1091 error ("prototype for %q+D declares more arguments "
1092 "than previous old-style definition", newdecl);
1095 else if (END_OF_ARGLIST (newargtype))
1097 error ("prototype for %q+D declares fewer arguments "
1098 "than previous old-style definition", newdecl);
1102 /* Type for passing arg must be consistent with that declared
1104 else if (!comptypes (oldargtype, newargtype))
1106 error ("prototype for %q+D declares argument %d"
1107 " with incompatible type",
1112 oldargs = TREE_CHAIN (oldargs);
1113 newargs = TREE_CHAIN (newargs);
1117 /* If we get here, no errors were found, but do issue a warning
1118 for this poor-style construct. */
1119 warning (0, "prototype for %q+D follows non-prototype definition",
1122 #undef END_OF_ARGLIST
1125 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1126 first in a pair of mismatched declarations, using the diagnostic
1129 locate_old_decl (tree decl, void (*diag)(const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2))
1131 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1133 else if (DECL_INITIAL (decl))
1134 diag (G_("previous definition of %q+D was here"), decl);
1135 else if (C_DECL_IMPLICIT (decl))
1136 diag (G_("previous implicit declaration of %q+D was here"), decl);
1138 diag (G_("previous declaration of %q+D was here"), decl);
1141 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1142 Returns true if the caller should proceed to merge the two, false
1143 if OLDDECL should simply be discarded. As a side effect, issues
1144 all necessary diagnostics for invalid or poor-style combinations.
1145 If it returns true, writes the types of NEWDECL and OLDDECL to
1146 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1147 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1150 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1151 tree *newtypep, tree *oldtypep)
1153 tree newtype, oldtype;
1154 bool pedwarned = false;
1155 bool warned = false;
1158 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1159 && DECL_EXTERNAL (DECL))
1161 /* If we have error_mark_node for either decl or type, just discard
1162 the previous decl - we're in an error cascade already. */
1163 if (olddecl == error_mark_node || newdecl == error_mark_node)
1165 *oldtypep = oldtype = TREE_TYPE (olddecl);
1166 *newtypep = newtype = TREE_TYPE (newdecl);
1167 if (oldtype == error_mark_node || newtype == error_mark_node)
1170 /* Two different categories of symbol altogether. This is an error
1171 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1172 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1174 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1175 && DECL_BUILT_IN (olddecl)
1176 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1178 error ("%q+D redeclared as different kind of symbol", newdecl);
1179 locate_old_decl (olddecl, error);
1181 else if (TREE_PUBLIC (newdecl))
1182 warning (0, "built-in function %q+D declared as non-function",
1185 warning (OPT_Wshadow, "declaration of %q+D shadows "
1186 "a built-in function", newdecl);
1190 /* Enumerators have no linkage, so may only be declared once in a
1192 if (TREE_CODE (olddecl) == CONST_DECL)
1194 error ("redeclaration of enumerator %q+D", newdecl);
1195 locate_old_decl (olddecl, error);
1199 if (!comptypes (oldtype, newtype))
1201 if (TREE_CODE (olddecl) == FUNCTION_DECL
1202 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1204 /* Accept harmless mismatch in function types.
1205 This is for the ffs and fprintf builtins. */
1206 tree trytype = match_builtin_function_types (newtype, oldtype);
1208 if (trytype && comptypes (newtype, trytype))
1209 *oldtypep = oldtype = trytype;
1212 /* If types don't match for a built-in, throw away the
1213 built-in. No point in calling locate_old_decl here, it
1214 won't print anything. */
1215 warning (0, "conflicting types for built-in function %q+D",
1220 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1221 && DECL_IS_BUILTIN (olddecl))
1223 /* A conflicting function declaration for a predeclared
1224 function that isn't actually built in. Objective C uses
1225 these. The new declaration silently overrides everything
1226 but the volatility (i.e. noreturn) indication. See also
1227 below. FIXME: Make Objective C use normal builtins. */
1228 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1231 /* Permit void foo (...) to match int foo (...) if the latter is
1232 the definition and implicit int was used. See
1233 c-torture/compile/920625-2.c. */
1234 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1235 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1236 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1237 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1239 pedwarn ("conflicting types for %q+D", newdecl);
1240 /* Make sure we keep void as the return type. */
1241 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1242 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1245 /* Permit void foo (...) to match an earlier call to foo (...) with
1246 no declared type (thus, implicitly int). */
1247 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1248 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1249 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1250 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1252 pedwarn ("conflicting types for %q+D", newdecl);
1253 /* Make sure we keep void as the return type. */
1254 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1259 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1260 error ("conflicting type qualifiers for %q+D", newdecl);
1262 error ("conflicting types for %q+D", newdecl);
1263 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1264 locate_old_decl (olddecl, error);
1269 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1270 but silently ignore the redeclaration if either is in a system
1271 header. (Conflicting redeclarations were handled above.) */
1272 if (TREE_CODE (newdecl) == TYPE_DECL)
1274 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1275 return true; /* Allow OLDDECL to continue in use. */
1277 error ("redefinition of typedef %q+D", newdecl);
1278 locate_old_decl (olddecl, error);
1282 /* Function declarations can either be 'static' or 'extern' (no
1283 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1284 can never conflict with each other on account of linkage (6.2.2p4).
1285 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1286 two definitions if one is 'extern inline' and one is not. The non-
1287 extern-inline definition supersedes the extern-inline definition. */
1289 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1291 /* If you declare a built-in function name as static, or
1292 define the built-in with an old-style definition (so we
1293 can't validate the argument list) the built-in definition is
1294 overridden, but optionally warn this was a bad choice of name. */
1295 if (DECL_BUILT_IN (olddecl)
1296 && !C_DECL_DECLARED_BUILTIN (olddecl)
1297 && (!TREE_PUBLIC (newdecl)
1298 || (DECL_INITIAL (newdecl)
1299 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1301 warning (OPT_Wshadow, "declaration of %q+D shadows "
1302 "a built-in function", newdecl);
1303 /* Discard the old built-in function. */
1307 if (DECL_INITIAL (newdecl))
1309 if (DECL_INITIAL (olddecl))
1311 /* If both decls are in the same TU and the new declaration
1312 isn't overriding an extern inline reject the new decl.
1313 When we handle c99 style inline rules we'll want to reject
1316 DECL_EXTERN_INLINE (olddecl)
1317 && !DECL_EXTERN_INLINE (newdecl)
1319 if they're in the same translation unit. Until we implement
1320 the full semantics we accept the construct. */
1321 if (!(DECL_EXTERN_INLINE (olddecl)
1322 && !DECL_EXTERN_INLINE (newdecl))
1323 && same_translation_unit_p (newdecl, olddecl))
1325 error ("redefinition of %q+D", newdecl);
1326 locate_old_decl (olddecl, error);
1331 /* If we have a prototype after an old-style function definition,
1332 the argument types must be checked specially. */
1333 else if (DECL_INITIAL (olddecl)
1334 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1335 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1336 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1338 locate_old_decl (olddecl, error);
1341 /* A non-static declaration (even an "extern") followed by a
1342 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1343 The same is true for a static forward declaration at block
1344 scope followed by a non-static declaration/definition at file
1345 scope. Static followed by non-static at the same scope is
1346 not undefined behavior, and is the most convenient way to get
1347 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1348 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1349 we do diagnose it if -Wtraditional. */
1350 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1352 /* Two exceptions to the rule. If olddecl is an extern
1353 inline, or a predeclared function that isn't actually
1354 built in, newdecl silently overrides olddecl. The latter
1355 occur only in Objective C; see also above. (FIXME: Make
1356 Objective C use normal builtins.) */
1357 if (!DECL_IS_BUILTIN (olddecl)
1358 && !DECL_EXTERN_INLINE (olddecl))
1360 error ("static declaration of %q+D follows "
1361 "non-static declaration", newdecl);
1362 locate_old_decl (olddecl, error);
1366 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1368 if (DECL_CONTEXT (olddecl))
1370 error ("non-static declaration of %q+D follows "
1371 "static declaration", newdecl);
1372 locate_old_decl (olddecl, error);
1375 else if (warn_traditional)
1377 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1378 "follows static declaration", newdecl);
1383 else if (TREE_CODE (newdecl) == VAR_DECL)
1385 /* Only variables can be thread-local, and all declarations must
1386 agree on this property. */
1387 if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1389 if (DECL_THREAD_LOCAL_P (newdecl))
1390 error ("thread-local declaration of %q+D follows "
1391 "non-thread-local declaration", newdecl);
1393 error ("non-thread-local declaration of %q+D follows "
1394 "thread-local declaration", newdecl);
1396 locate_old_decl (olddecl, error);
1400 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1401 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1403 error ("redefinition of %q+D", newdecl);
1404 locate_old_decl (olddecl, error);
1408 /* Objects declared at file scope: if the first declaration had
1409 external linkage (even if it was an external reference) the
1410 second must have external linkage as well, or the behavior is
1411 undefined. If the first declaration had internal linkage, then
1412 the second must too, or else be an external reference (in which
1413 case the composite declaration still has internal linkage).
1414 As for function declarations, we warn about the static-then-
1415 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1416 if (DECL_FILE_SCOPE_P (newdecl)
1417 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1419 if (DECL_EXTERNAL (newdecl))
1421 if (!DECL_FILE_SCOPE_P (olddecl))
1423 error ("extern declaration of %q+D follows "
1424 "declaration with no linkage", newdecl);
1425 locate_old_decl (olddecl, error);
1428 else if (warn_traditional)
1430 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1431 "follows static declaration", newdecl);
1437 if (TREE_PUBLIC (newdecl))
1438 error ("non-static declaration of %q+D follows "
1439 "static declaration", newdecl);
1441 error ("static declaration of %q+D follows "
1442 "non-static declaration", newdecl);
1444 locate_old_decl (olddecl, error);
1448 /* Two objects with the same name declared at the same block
1449 scope must both be external references (6.7p3). */
1450 else if (!DECL_FILE_SCOPE_P (newdecl))
1452 if (DECL_EXTERNAL (newdecl))
1454 /* Extern with initializer at block scope, which will
1455 already have received an error. */
1457 else if (DECL_EXTERNAL (olddecl))
1459 error ("declaration of %q+D with no linkage follows "
1460 "extern declaration", newdecl);
1461 locate_old_decl (olddecl, error);
1465 error ("redeclaration of %q+D with no linkage", newdecl);
1466 locate_old_decl (olddecl, error);
1474 /* All decls must agree on a visibility. */
1475 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
1476 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1477 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1479 warning (0, "redeclaration of %q+D with different visibility "
1480 "(old visibility preserved)", newdecl);
1484 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1486 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1487 if (DECL_DECLARED_INLINE_P (newdecl)
1488 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1490 warning (OPT_Wattributes, "inline declaration of %qD follows "
1491 "declaration with attribute noinline", newdecl);
1494 else if (DECL_DECLARED_INLINE_P (olddecl)
1495 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1497 warning (OPT_Wattributes, "declaration of %q+D with attribute "
1498 "noinline follows inline declaration ", newdecl);
1502 /* Inline declaration after use or definition.
1503 ??? Should we still warn about this now we have unit-at-a-time
1504 mode and can get it right?
1505 Definitely don't complain if the decls are in different translation
1507 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1508 && same_translation_unit_p (olddecl, newdecl))
1510 if (TREE_USED (olddecl))
1512 warning (0, "%q+D declared inline after being called", olddecl);
1515 else if (DECL_INITIAL (olddecl))
1517 warning (0, "%q+D declared inline after its definition", olddecl);
1522 else /* PARM_DECL, VAR_DECL */
1524 /* Redeclaration of a parameter is a constraint violation (this is
1525 not explicitly stated, but follows from C99 6.7p3 [no more than
1526 one declaration of the same identifier with no linkage in the
1527 same scope, except type tags] and 6.2.2p6 [parameters have no
1528 linkage]). We must check for a forward parameter declaration,
1529 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1530 an extension, the mandatory diagnostic for which is handled by
1531 mark_forward_parm_decls. */
1533 if (TREE_CODE (newdecl) == PARM_DECL
1534 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1536 error ("redefinition of parameter %q+D", newdecl);
1537 locate_old_decl (olddecl, error);
1542 /* Optional warning for completely redundant decls. */
1543 if (!warned && !pedwarned
1544 && warn_redundant_decls
1545 /* Don't warn about a function declaration followed by a
1547 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1548 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1549 /* Don't warn about redundant redeclarations of builtins. */
1550 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1551 && !DECL_BUILT_IN (newdecl)
1552 && DECL_BUILT_IN (olddecl)
1553 && !C_DECL_DECLARED_BUILTIN (olddecl))
1554 /* Don't warn about an extern followed by a definition. */
1555 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1556 /* Don't warn about forward parameter decls. */
1557 && !(TREE_CODE (newdecl) == PARM_DECL
1558 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1559 /* Don't warn about a variable definition following a declaration. */
1560 && !(TREE_CODE (newdecl) == VAR_DECL
1561 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
1563 warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
1568 /* Report location of previous decl/defn in a consistent manner. */
1569 if (warned || pedwarned)
1570 locate_old_decl (olddecl, pedwarned ? pedwarn : warning0);
1572 #undef DECL_EXTERN_INLINE
1577 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1578 consistent with OLDDECL, but carries new information. Merge the
1579 new information into OLDDECL. This function issues no
1583 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1585 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1586 && DECL_INITIAL (newdecl) != 0);
1587 int new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
1588 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
1589 int old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
1590 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
1592 /* For real parm decl following a forward decl, rechain the old decl
1593 in its new location and clear TREE_ASM_WRITTEN (it's not a
1594 forward decl anymore). */
1595 if (TREE_CODE (newdecl) == PARM_DECL
1596 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1598 struct c_binding *b, **here;
1600 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1601 if ((*here)->decl == olddecl)
1608 b->prev = current_scope->bindings;
1609 current_scope->bindings = b;
1611 TREE_ASM_WRITTEN (olddecl) = 0;
1614 DECL_ATTRIBUTES (newdecl)
1615 = targetm.merge_decl_attributes (olddecl, newdecl);
1617 /* Merge the data types specified in the two decls. */
1619 = TREE_TYPE (olddecl)
1620 = composite_type (newtype, oldtype);
1622 /* Lay the type out, unless already done. */
1623 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1625 if (TREE_TYPE (newdecl) != error_mark_node)
1626 layout_type (TREE_TYPE (newdecl));
1627 if (TREE_CODE (newdecl) != FUNCTION_DECL
1628 && TREE_CODE (newdecl) != TYPE_DECL
1629 && TREE_CODE (newdecl) != CONST_DECL)
1630 layout_decl (newdecl, 0);
1634 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1635 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1636 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1637 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1638 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1639 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1641 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1642 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1647 /* Merge the type qualifiers. */
1648 if (TREE_READONLY (newdecl))
1649 TREE_READONLY (olddecl) = 1;
1651 if (TREE_THIS_VOLATILE (newdecl))
1653 TREE_THIS_VOLATILE (olddecl) = 1;
1654 if (TREE_CODE (newdecl) == VAR_DECL)
1655 make_var_volatile (newdecl);
1658 /* Merge deprecatedness. */
1659 if (TREE_DEPRECATED (newdecl))
1660 TREE_DEPRECATED (olddecl) = 1;
1662 /* Keep source location of definition rather than declaration and of
1663 prototype rather than non-prototype unless that prototype is
1665 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1666 || (old_is_prototype && !new_is_prototype
1667 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1668 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1670 /* Merge the initialization information. */
1671 if (DECL_INITIAL (newdecl) == 0)
1672 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1674 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1676 /* Merge the unused-warning information. */
1677 if (DECL_IN_SYSTEM_HEADER (olddecl))
1678 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1679 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1680 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1682 /* Merge the section attribute.
1683 We want to issue an error if the sections conflict but that must be
1684 done later in decl_attributes since we are called before attributes
1686 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1687 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1689 /* Copy the assembler name.
1690 Currently, it can only be defined in the prototype. */
1691 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1693 /* Use visibility of whichever declaration had it specified */
1694 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1696 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1697 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1700 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1702 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1703 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1704 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1705 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1706 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1707 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1708 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1709 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1710 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1711 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1714 /* Merge the storage class information. */
1715 merge_weak (newdecl, olddecl);
1717 /* For functions, static overrides non-static. */
1718 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1720 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1721 /* This is since we don't automatically
1722 copy the attributes of NEWDECL into OLDDECL. */
1723 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1724 /* If this clears `static', clear it in the identifier too. */
1725 if (!TREE_PUBLIC (olddecl))
1726 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1730 if (DECL_EXTERNAL (newdecl))
1732 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1733 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1735 /* An extern decl does not override previous storage class. */
1736 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1737 if (!DECL_EXTERNAL (newdecl))
1739 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1740 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1745 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1746 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1749 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1751 /* If we're redefining a function previously defined as extern
1752 inline, make sure we emit debug info for the inline before we
1753 throw it away, in case it was inlined into a function that hasn't
1754 been written out yet. */
1755 if (new_is_definition && DECL_INITIAL (olddecl))
1757 if (TREE_USED (olddecl)
1758 /* In unit-at-a-time mode we never inline re-defined extern
1759 inline functions. */
1760 && !flag_unit_at_a_time
1761 && cgraph_function_possibly_inlined_p (olddecl))
1762 (*debug_hooks->outlining_inline_function) (olddecl);
1764 /* The new defn must not be inline. */
1765 DECL_INLINE (newdecl) = 0;
1766 DECL_UNINLINABLE (newdecl) = 1;
1770 /* If either decl says `inline', this fn is inline,
1771 unless its definition was passed already. */
1772 if (DECL_DECLARED_INLINE_P (newdecl)
1773 || DECL_DECLARED_INLINE_P (olddecl))
1774 DECL_DECLARED_INLINE_P (newdecl) = 1;
1776 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1777 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1780 if (DECL_BUILT_IN (olddecl))
1782 /* If redeclaring a builtin function, it stays built in.
1783 But it gets tagged as having been declared. */
1784 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1785 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1786 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1787 if (new_is_prototype)
1788 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1790 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1791 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1794 /* Also preserve various other info from the definition. */
1795 if (!new_is_definition)
1797 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1798 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1799 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1800 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1801 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1803 /* Set DECL_INLINE on the declaration if we've got a body
1804 from which to instantiate. */
1805 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1807 DECL_INLINE (newdecl) = 1;
1808 DECL_ABSTRACT_ORIGIN (newdecl)
1809 = DECL_ABSTRACT_ORIGIN (olddecl);
1814 /* If a previous declaration said inline, mark the
1815 definition as inlinable. */
1816 if (DECL_DECLARED_INLINE_P (newdecl)
1817 && !DECL_UNINLINABLE (newdecl))
1818 DECL_INLINE (newdecl) = 1;
1822 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1823 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1825 unsigned olddecl_uid = DECL_UID (olddecl);
1826 tree olddecl_context = DECL_CONTEXT (olddecl);
1828 memcpy ((char *) olddecl + sizeof (struct tree_common),
1829 (char *) newdecl + sizeof (struct tree_common),
1830 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1831 switch (TREE_CODE (olddecl))
1841 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1842 (char *) newdecl + sizeof (struct tree_decl_common),
1843 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1848 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1849 (char *) newdecl + sizeof (struct tree_decl_common),
1850 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1852 DECL_UID (olddecl) = olddecl_uid;
1853 DECL_CONTEXT (olddecl) = olddecl_context;
1856 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1857 so that encode_section_info has a chance to look at the new decl
1858 flags and attributes. */
1859 if (DECL_RTL_SET_P (olddecl)
1860 && (TREE_CODE (olddecl) == FUNCTION_DECL
1861 || (TREE_CODE (olddecl) == VAR_DECL
1862 && TREE_STATIC (olddecl))))
1863 make_decl_rtl (olddecl);
1866 /* Handle when a new declaration NEWDECL has the same name as an old
1867 one OLDDECL in the same binding contour. Prints an error message
1870 If safely possible, alter OLDDECL to look like NEWDECL, and return
1871 true. Otherwise, return false. */
1874 duplicate_decls (tree newdecl, tree olddecl)
1876 tree newtype = NULL, oldtype = NULL;
1878 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1881 merge_decls (newdecl, olddecl, newtype, oldtype);
1886 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1888 warn_if_shadowing (tree new_decl)
1890 struct c_binding *b;
1892 /* Shadow warnings wanted? */
1894 /* No shadow warnings for internally generated vars. */
1895 || DECL_IS_BUILTIN (new_decl)
1896 /* No shadow warnings for vars made for inlining. */
1897 || DECL_FROM_INLINE (new_decl))
1900 /* Is anything being shadowed? Invisible decls do not count. */
1901 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1902 if (b->decl && b->decl != new_decl && !b->invisible)
1904 tree old_decl = b->decl;
1906 if (old_decl == error_mark_node)
1908 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1909 "non-variable", new_decl);
1912 else if (TREE_CODE (old_decl) == PARM_DECL)
1913 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
1915 else if (DECL_FILE_SCOPE_P (old_decl))
1916 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
1917 "declaration", new_decl);
1918 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1919 && DECL_BUILT_IN (old_decl))
1921 warning (OPT_Wshadow, "declaration of %q+D shadows "
1922 "a built-in function", new_decl);
1926 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
1929 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
1936 /* Subroutine of pushdecl.
1938 X is a TYPE_DECL for a typedef statement. Create a brand new
1939 ..._TYPE node (which will be just a variant of the existing
1940 ..._TYPE node with identical properties) and then install X
1941 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1943 The whole point here is to end up with a situation where each
1944 and every ..._TYPE node the compiler creates will be uniquely
1945 associated with AT MOST one node representing a typedef name.
1946 This way, even though the compiler substitutes corresponding
1947 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1948 early on, later parts of the compiler can always do the reverse
1949 translation and get back the corresponding typedef name. For
1952 typedef struct S MY_TYPE;
1955 Later parts of the compiler might only know that `object' was of
1956 type `struct S' if it were not for code just below. With this
1957 code however, later parts of the compiler see something like:
1959 struct S' == struct S
1960 typedef struct S' MY_TYPE;
1963 And they can then deduce (from the node for type struct S') that
1964 the original object declaration was:
1968 Being able to do this is important for proper support of protoize,
1969 and also for generating precise symbolic debugging information
1970 which takes full account of the programmer's (typedef) vocabulary.
1972 Obviously, we don't want to generate a duplicate ..._TYPE node if
1973 the TYPE_DECL node that we are now processing really represents a
1974 standard built-in type.
1976 Since all standard types are effectively declared at line zero
1977 in the source file, we can easily check to see if we are working
1978 on a standard type by checking the current value of lineno. */
1981 clone_underlying_type (tree x)
1983 if (DECL_IS_BUILTIN (x))
1985 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1986 TYPE_NAME (TREE_TYPE (x)) = x;
1988 else if (TREE_TYPE (x) != error_mark_node
1989 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1991 tree tt = TREE_TYPE (x);
1992 DECL_ORIGINAL_TYPE (x) = tt;
1993 tt = build_variant_type_copy (tt);
1995 TREE_USED (tt) = TREE_USED (x);
2000 /* Record a decl-node X as belonging to the current lexical scope.
2001 Check for errors (such as an incompatible declaration for the same
2002 name already seen in the same scope).
2004 Returns either X or an old decl for the same name.
2005 If an old decl is returned, it may have been smashed
2006 to agree with what X says. */
2011 tree name = DECL_NAME (x);
2012 struct c_scope *scope = current_scope;
2013 struct c_binding *b;
2014 bool nested = false;
2016 /* Functions need the lang_decl data. */
2017 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
2018 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
2020 /* Must set DECL_CONTEXT for everything not at file scope or
2021 DECL_FILE_SCOPE_P won't work. Local externs don't count
2022 unless they have initializers (which generate code). */
2023 if (current_function_decl
2024 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2025 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2026 DECL_CONTEXT (x) = current_function_decl;
2028 /* If this is of variably modified type, prevent jumping into its
2030 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2031 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2032 c_begin_vm_scope (scope->depth);
2034 /* Anonymous decls are just inserted in the scope. */
2037 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
2041 /* First, see if there is another declaration with the same name in
2042 the current scope. If there is, duplicate_decls may do all the
2043 work for us. If duplicate_decls returns false, that indicates
2044 two incompatible decls in the same scope; we are to silently
2045 replace the old one (duplicate_decls has issued all appropriate
2046 diagnostics). In particular, we should not consider possible
2047 duplicates in the external scope, or shadowing. */
2048 b = I_SYMBOL_BINDING (name);
2049 if (b && B_IN_SCOPE (b, scope))
2051 struct c_binding *b_ext, *b_use;
2052 tree type = TREE_TYPE (x);
2053 tree visdecl = b->decl;
2054 tree vistype = TREE_TYPE (visdecl);
2055 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2056 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2057 b->inner_comp = false;
2060 /* If this is an external linkage declaration, we should check
2061 for compatibility with the type in the external scope before
2062 setting the type at this scope based on the visible
2063 information only. */
2064 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2066 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2067 b_ext = b_ext->shadowed;
2072 TREE_TYPE (b_use->decl) = b_use->type;
2075 if (duplicate_decls (x, b_use->decl))
2079 /* Save the updated type in the external scope and
2080 restore the proper type for this scope. */
2082 if (comptypes (vistype, type))
2083 thistype = composite_type (vistype, type);
2085 thistype = TREE_TYPE (b_use->decl);
2086 b_use->type = TREE_TYPE (b_use->decl);
2087 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2088 && DECL_BUILT_IN (b_use->decl))
2090 = build_type_attribute_variant (thistype,
2093 TREE_TYPE (b_use->decl) = thistype;
2098 goto skip_external_and_shadow_checks;
2101 /* All declarations with external linkage, and all external
2102 references, go in the external scope, no matter what scope is
2103 current. However, the binding in that scope is ignored for
2104 purposes of normal name lookup. A separate binding structure is
2105 created in the requested scope; this governs the normal
2106 visibility of the symbol.
2108 The binding in the externals scope is used exclusively for
2109 detecting duplicate declarations of the same object, no matter
2110 what scope they are in; this is what we do here. (C99 6.2.7p2:
2111 All declarations that refer to the same object or function shall
2112 have compatible type; otherwise, the behavior is undefined.) */
2113 if (DECL_EXTERNAL (x) || scope == file_scope)
2115 tree type = TREE_TYPE (x);
2118 bool type_saved = false;
2119 if (b && !B_IN_EXTERNAL_SCOPE (b)
2120 && (TREE_CODE (b->decl) == FUNCTION_DECL
2121 || TREE_CODE (b->decl) == VAR_DECL)
2122 && DECL_FILE_SCOPE_P (b->decl))
2125 vistype = TREE_TYPE (visdecl);
2127 if (scope != file_scope
2128 && !DECL_IN_SYSTEM_HEADER (x))
2129 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2131 while (b && !B_IN_EXTERNAL_SCOPE (b))
2133 /* If this decl might be modified, save its type. This is
2134 done here rather than when the decl is first bound
2135 because the type may change after first binding, through
2136 being completed or through attributes being added. If we
2137 encounter multiple such decls, only the first should have
2138 its type saved; the others will already have had their
2139 proper types saved and the types will not have changed as
2140 their scopes will not have been re-entered. */
2141 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2143 b->type = TREE_TYPE (b->decl);
2146 if (B_IN_FILE_SCOPE (b)
2147 && TREE_CODE (b->decl) == VAR_DECL
2148 && TREE_STATIC (b->decl)
2149 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2150 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2151 && TREE_CODE (type) == ARRAY_TYPE
2152 && TYPE_DOMAIN (type)
2153 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2154 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2156 /* Array type completed in inner scope, which should be
2157 diagnosed if the completion does not have size 1 and
2158 it does not get completed in the file scope. */
2159 b->inner_comp = true;
2164 /* If a matching external declaration has been found, set its
2165 type to the composite of all the types of that declaration.
2166 After the consistency checks, it will be reset to the
2167 composite of the visible types only. */
2168 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2170 TREE_TYPE (b->decl) = b->type;
2172 /* The point of the same_translation_unit_p check here is,
2173 we want to detect a duplicate decl for a construct like
2174 foo() { extern bar(); } ... static bar(); but not if
2175 they are in different translation units. In any case,
2176 the static does not go in the externals scope. */
2178 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2179 && duplicate_decls (x, b->decl))
2184 if (comptypes (vistype, type))
2185 thistype = composite_type (vistype, type);
2187 thistype = TREE_TYPE (b->decl);
2191 b->type = TREE_TYPE (b->decl);
2192 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2194 = build_type_attribute_variant (thistype,
2195 TYPE_ATTRIBUTES (b->type));
2196 TREE_TYPE (b->decl) = thistype;
2197 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2200 else if (TREE_PUBLIC (x))
2202 if (visdecl && !b && duplicate_decls (x, visdecl))
2204 /* An external declaration at block scope referring to a
2205 visible entity with internal linkage. The composite
2206 type will already be correct for this scope, so we
2207 just need to fall through to make the declaration in
2214 bind (name, x, external_scope, /*invisible=*/true,
2221 if (TREE_CODE (x) != PARM_DECL)
2222 warn_if_shadowing (x);
2224 skip_external_and_shadow_checks:
2225 if (TREE_CODE (x) == TYPE_DECL)
2226 clone_underlying_type (x);
2228 bind (name, x, scope, /*invisible=*/false, nested);
2230 /* If x's type is incomplete because it's based on a
2231 structure or union which has not yet been fully declared,
2232 attach it to that structure or union type, so we can go
2233 back and complete the variable declaration later, if the
2234 structure or union gets fully declared.
2236 If the input is erroneous, we can have error_mark in the type
2237 slot (e.g. "f(void a, ...)") - that doesn't count as an
2239 if (TREE_TYPE (x) != error_mark_node
2240 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2242 tree element = TREE_TYPE (x);
2244 while (TREE_CODE (element) == ARRAY_TYPE)
2245 element = TREE_TYPE (element);
2246 element = TYPE_MAIN_VARIANT (element);
2248 if ((TREE_CODE (element) == RECORD_TYPE
2249 || TREE_CODE (element) == UNION_TYPE)
2250 && (TREE_CODE (x) != TYPE_DECL
2251 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2252 && !COMPLETE_TYPE_P (element))
2253 C_TYPE_INCOMPLETE_VARS (element)
2254 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2259 /* Record X as belonging to file scope.
2260 This is used only internally by the Objective-C front end,
2261 and is limited to its needs. duplicate_decls is not called;
2262 if there is any preexisting decl for this identifier, it is an ICE. */
2265 pushdecl_top_level (tree x)
2268 bool nested = false;
2269 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2271 name = DECL_NAME (x);
2273 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2275 if (TREE_PUBLIC (x))
2277 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2281 bind (name, x, file_scope, /*invisible=*/false, nested);
2287 implicit_decl_warning (tree id, tree olddecl)
2289 void (*diag) (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
2290 switch (mesg_implicit_function_declaration)
2293 case 1: diag = warning0; break;
2294 case 2: diag = error; break;
2295 default: gcc_unreachable ();
2298 diag (G_("implicit declaration of function %qE"), id);
2300 locate_old_decl (olddecl, diag);
2303 /* Generate an implicit declaration for identifier FUNCTIONID as a
2304 function of type int (). */
2307 implicitly_declare (tree functionid)
2309 struct c_binding *b;
2313 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2315 if (B_IN_SCOPE (b, external_scope))
2324 if (decl == error_mark_node)
2327 /* FIXME: Objective-C has weird not-really-builtin functions
2328 which are supposed to be visible automatically. They wind up
2329 in the external scope because they're pushed before the file
2330 scope gets created. Catch this here and rebind them into the
2332 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2334 bind (functionid, decl, file_scope,
2335 /*invisible=*/false, /*nested=*/true);
2340 tree newtype = default_function_type;
2342 TREE_TYPE (decl) = b->type;
2343 /* Implicit declaration of a function already declared
2344 (somehow) in a different scope, or as a built-in.
2345 If this is the first time this has happened, warn;
2346 then recycle the old declaration but with the new type. */
2347 if (!C_DECL_IMPLICIT (decl))
2349 implicit_decl_warning (functionid, decl);
2350 C_DECL_IMPLICIT (decl) = 1;
2352 if (DECL_BUILT_IN (decl))
2354 newtype = build_type_attribute_variant (newtype,
2356 (TREE_TYPE (decl)));
2357 if (!comptypes (newtype, TREE_TYPE (decl)))
2359 warning (0, "incompatible implicit declaration of built-in"
2360 " function %qD", decl);
2361 newtype = TREE_TYPE (decl);
2366 if (!comptypes (newtype, TREE_TYPE (decl)))
2368 error ("incompatible implicit declaration of function %qD",
2370 locate_old_decl (decl, error);
2373 b->type = TREE_TYPE (decl);
2374 TREE_TYPE (decl) = newtype;
2375 bind (functionid, decl, current_scope,
2376 /*invisible=*/false, /*nested=*/true);
2381 /* Not seen before. */
2382 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2383 DECL_EXTERNAL (decl) = 1;
2384 TREE_PUBLIC (decl) = 1;
2385 C_DECL_IMPLICIT (decl) = 1;
2386 implicit_decl_warning (functionid, 0);
2387 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2389 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2391 /* C89 says implicit declarations are in the innermost block.
2392 So we record the decl in the standard fashion. */
2393 decl = pushdecl (decl);
2395 /* No need to call objc_check_decl here - it's a function type. */
2396 rest_of_decl_compilation (decl, 0, 0);
2398 /* Write a record describing this implicit function declaration
2399 to the prototypes file (if requested). */
2400 gen_aux_info_record (decl, 0, 1, 0);
2402 /* Possibly apply some default attributes to this implicit declaration. */
2403 decl_attributes (&decl, NULL_TREE, 0);
2408 /* Issue an error message for a reference to an undeclared variable
2409 ID, including a reference to a builtin outside of function-call
2410 context. Establish a binding of the identifier to error_mark_node
2411 in an appropriate scope, which will suppress further errors for the
2412 same identifier. The error message should be given location LOC. */
2414 undeclared_variable (tree id, location_t loc)
2416 static bool already = false;
2417 struct c_scope *scope;
2419 if (current_function_decl == 0)
2421 error ("%H%qE undeclared here (not in a function)", &loc, id);
2422 scope = current_scope;
2426 error ("%H%qE undeclared (first use in this function)", &loc, id);
2430 error ("%H(Each undeclared identifier is reported only once", &loc);
2431 error ("%Hfor each function it appears in.)", &loc);
2435 /* If we are parsing old-style parameter decls, current_function_decl
2436 will be nonnull but current_function_scope will be null. */
2437 scope = current_function_scope ? current_function_scope : current_scope;
2439 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2442 /* Subroutine of lookup_label, declare_label, define_label: construct a
2443 LABEL_DECL with all the proper frills. */
2446 make_label (tree name, location_t location)
2448 tree label = build_decl (LABEL_DECL, name, void_type_node);
2450 DECL_CONTEXT (label) = current_function_decl;
2451 DECL_MODE (label) = VOIDmode;
2452 DECL_SOURCE_LOCATION (label) = location;
2457 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2458 Create one if none exists so far for the current function.
2459 This is called when a label is used in a goto expression or
2460 has its address taken. */
2463 lookup_label (tree name)
2467 if (current_function_decl == 0)
2469 error ("label %qE referenced outside of any function", name);
2473 /* Use a label already defined or ref'd with this name, but not if
2474 it is inherited from a containing function and wasn't declared
2476 label = I_LABEL_DECL (name);
2477 if (label && (DECL_CONTEXT (label) == current_function_decl
2478 || C_DECLARED_LABEL_FLAG (label)))
2480 /* If the label has only been declared, update its apparent
2481 location to point here, for better diagnostics if it
2482 turns out not to have been defined. */
2483 if (!TREE_USED (label))
2484 DECL_SOURCE_LOCATION (label) = input_location;
2488 /* No label binding for that identifier; make one. */
2489 label = make_label (name, input_location);
2491 /* Ordinary labels go in the current function scope. */
2492 bind (name, label, current_function_scope,
2493 /*invisible=*/false, /*nested=*/false);
2497 /* Make a label named NAME in the current function, shadowing silently
2498 any that may be inherited from containing functions or containing
2499 scopes. This is called for __label__ declarations. */
2502 declare_label (tree name)
2504 struct c_binding *b = I_LABEL_BINDING (name);
2507 /* Check to make sure that the label hasn't already been declared
2509 if (b && B_IN_CURRENT_SCOPE (b))
2511 error ("duplicate label declaration %qE", name);
2512 locate_old_decl (b->decl, error);
2514 /* Just use the previous declaration. */
2518 label = make_label (name, input_location);
2519 C_DECLARED_LABEL_FLAG (label) = 1;
2521 /* Declared labels go in the current scope. */
2522 bind (name, label, current_scope,
2523 /*invisible=*/false, /*nested=*/false);
2527 /* Define a label, specifying the location in the source file.
2528 Return the LABEL_DECL node for the label, if the definition is valid.
2529 Otherwise return 0. */
2532 define_label (location_t location, tree name)
2534 /* Find any preexisting label with this name. It is an error
2535 if that label has already been defined in this function, or
2536 if there is a containing function with a declared label with
2538 tree label = I_LABEL_DECL (name);
2539 struct c_label_list *nlist_se, *nlist_vm;
2542 && ((DECL_CONTEXT (label) == current_function_decl
2543 && DECL_INITIAL (label) != 0)
2544 || (DECL_CONTEXT (label) != current_function_decl
2545 && C_DECLARED_LABEL_FLAG (label))))
2547 error ("%Hduplicate label %qD", &location, label);
2548 locate_old_decl (label, error);
2551 else if (label && DECL_CONTEXT (label) == current_function_decl)
2553 /* The label has been used or declared already in this function,
2554 but not defined. Update its location to point to this
2556 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2557 error ("%Jjump into statement expression", label);
2558 if (C_DECL_UNDEFINABLE_VM (label))
2559 error ("%Jjump into scope of identifier with variably modified type",
2561 DECL_SOURCE_LOCATION (label) = location;
2565 /* No label binding for that identifier; make one. */
2566 label = make_label (name, location);
2568 /* Ordinary labels go in the current function scope. */
2569 bind (name, label, current_function_scope,
2570 /*invisible=*/false, /*nested=*/false);
2573 if (!in_system_header && lookup_name (name))
2574 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2575 "for labels, identifier %qE conflicts", &location, name);
2577 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2578 nlist_se->next = label_context_stack_se->labels_def;
2579 nlist_se->label = label;
2580 label_context_stack_se->labels_def = nlist_se;
2582 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2583 nlist_vm->next = label_context_stack_vm->labels_def;
2584 nlist_vm->label = label;
2585 label_context_stack_vm->labels_def = nlist_vm;
2587 /* Mark label as having been defined. */
2588 DECL_INITIAL (label) = error_mark_node;
2592 /* Given NAME, an IDENTIFIER_NODE,
2593 return the structure (or union or enum) definition for that name.
2594 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2595 CODE says which kind of type the caller wants;
2596 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2597 If the wrong kind of type is found, an error is reported. */
2600 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2602 struct c_binding *b = I_TAG_BINDING (name);
2608 /* We only care about whether it's in this level if
2609 thislevel_only was set or it might be a type clash. */
2610 if (thislevel_only || TREE_CODE (b->decl) != code)
2612 /* For our purposes, a tag in the external scope is the same as
2613 a tag in the file scope. (Primarily relevant to Objective-C
2614 and its builtin structure tags, which get pushed before the
2615 file scope is created.) */
2616 if (B_IN_CURRENT_SCOPE (b)
2617 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2621 if (thislevel_only && !thislevel)
2624 if (TREE_CODE (b->decl) != code)
2626 /* Definition isn't the kind we were looking for. */
2627 pending_invalid_xref = name;
2628 pending_invalid_xref_location = input_location;
2630 /* If in the same binding level as a declaration as a tag
2631 of a different type, this must not be allowed to
2632 shadow that tag, so give the error immediately.
2633 (For example, "struct foo; union foo;" is invalid.) */
2635 pending_xref_error ();
2640 /* Print an error message now
2641 for a recent invalid struct, union or enum cross reference.
2642 We don't print them immediately because they are not invalid
2643 when used in the `struct foo;' construct for shadowing. */
2646 pending_xref_error (void)
2648 if (pending_invalid_xref != 0)
2649 error ("%H%qE defined as wrong kind of tag",
2650 &pending_invalid_xref_location, pending_invalid_xref);
2651 pending_invalid_xref = 0;
2655 /* Look up NAME in the current scope and its superiors
2656 in the namespace of variables, functions and typedefs.
2657 Return a ..._DECL node of some kind representing its definition,
2658 or return 0 if it is undefined. */
2661 lookup_name (tree name)
2663 struct c_binding *b = I_SYMBOL_BINDING (name);
2664 if (b && !b->invisible)
2669 /* Similar to `lookup_name' but look only at the indicated scope. */
2672 lookup_name_in_scope (tree name, struct c_scope *scope)
2674 struct c_binding *b;
2676 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2677 if (B_IN_SCOPE (b, scope))
2682 /* Create the predefined scalar types of C,
2683 and some nodes representing standard constants (0, 1, (void *) 0).
2684 Initialize the global scope.
2685 Make definitions for built-in primitive functions. */
2688 c_init_decl_processing (void)
2690 location_t save_loc = input_location;
2692 /* Initialize reserved words for parser. */
2695 current_function_decl = 0;
2697 gcc_obstack_init (&parser_obstack);
2699 /* Make the externals scope. */
2701 external_scope = current_scope;
2703 /* Declarations from c_common_nodes_and_builtins must not be associated
2704 with this input file, lest we get differences between using and not
2705 using preprocessed headers. */
2706 #ifdef USE_MAPPED_LOCATION
2707 input_location = BUILTINS_LOCATION;
2709 input_location.file = "<built-in>";
2710 input_location.line = 0;
2713 build_common_tree_nodes (flag_signed_char, false);
2715 c_common_nodes_and_builtins ();
2717 /* In C, comparisons and TRUTH_* expressions have type int. */
2718 truthvalue_type_node = integer_type_node;
2719 truthvalue_true_node = integer_one_node;
2720 truthvalue_false_node = integer_zero_node;
2722 /* Even in C99, which has a real boolean type. */
2723 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2724 boolean_type_node));
2726 input_location = save_loc;
2728 pedantic_lvalues = true;
2730 make_fname_decl = c_make_fname_decl;
2731 start_fname_decls ();
2734 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2735 decl, NAME is the initialization string and TYPE_DEP indicates whether
2736 NAME depended on the type of the function. As we don't yet implement
2737 delayed emission of static data, we mark the decl as emitted
2738 so it is not placed in the output. Anything using it must therefore pull
2739 out the STRING_CST initializer directly. FIXME. */
2742 c_make_fname_decl (tree id, int type_dep)
2744 const char *name = fname_as_string (type_dep);
2745 tree decl, type, init;
2746 size_t length = strlen (name);
2748 type = build_array_type (char_type_node,
2749 build_index_type (size_int (length)));
2750 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2752 decl = build_decl (VAR_DECL, id, type);
2754 TREE_STATIC (decl) = 1;
2755 TREE_READONLY (decl) = 1;
2756 DECL_ARTIFICIAL (decl) = 1;
2758 init = build_string (length + 1, name);
2759 free ((char *) name);
2760 TREE_TYPE (init) = type;
2761 DECL_INITIAL (decl) = init;
2763 TREE_USED (decl) = 1;
2765 if (current_function_decl)
2767 DECL_CONTEXT (decl) = current_function_decl;
2768 bind (id, decl, current_function_scope,
2769 /*invisible=*/false, /*nested=*/false);
2772 finish_decl (decl, init, NULL_TREE);
2777 /* Return a definition for a builtin function named NAME and whose data type
2778 is TYPE. TYPE should be a function type with argument types.
2779 FUNCTION_CODE tells later passes how to compile calls to this function.
2780 See tree.h for its possible values.
2782 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2783 the name to be called if we can't opencode the function. If
2784 ATTRS is nonzero, use that for the function's attribute list. */
2787 builtin_function (const char *name, tree type, int function_code,
2788 enum built_in_class cl, const char *library_name,
2791 tree id = get_identifier (name);
2792 tree decl = build_decl (FUNCTION_DECL, id, type);
2793 TREE_PUBLIC (decl) = 1;
2794 DECL_EXTERNAL (decl) = 1;
2795 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2796 DECL_BUILT_IN_CLASS (decl) = cl;
2797 DECL_FUNCTION_CODE (decl) = function_code;
2798 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2800 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2802 /* Should never be called on a symbol with a preexisting meaning. */
2803 gcc_assert (!I_SYMBOL_BINDING (id));
2805 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2807 /* Builtins in the implementation namespace are made visible without
2808 needing to be explicitly declared. See push_file_scope. */
2809 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2811 TREE_CHAIN (decl) = visible_builtins;
2812 visible_builtins = decl;
2815 /* Possibly apply some default attributes to this built-in function. */
2817 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2819 decl_attributes (&decl, NULL_TREE, 0);
2824 /* Called when a declaration is seen that contains no names to declare.
2825 If its type is a reference to a structure, union or enum inherited
2826 from a containing scope, shadow that tag name for the current scope
2827 with a forward reference.
2828 If its type defines a new named structure or union
2829 or defines an enum, it is valid but we need not do anything here.
2830 Otherwise, it is an error. */
2833 shadow_tag (const struct c_declspecs *declspecs)
2835 shadow_tag_warned (declspecs, 0);
2838 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2841 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2843 bool found_tag = false;
2845 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2847 tree value = declspecs->type;
2848 enum tree_code code = TREE_CODE (value);
2850 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2851 /* Used to test also that TYPE_SIZE (value) != 0.
2852 That caused warning for `struct foo;' at top level in the file. */
2854 tree name = TYPE_NAME (value);
2861 if (warned != 1 && code != ENUMERAL_TYPE)
2862 /* Empty unnamed enum OK */
2864 pedwarn ("unnamed struct/union that defines no instances");
2868 else if (!declspecs->tag_defined_p
2869 && declspecs->storage_class != csc_none)
2872 pedwarn ("empty declaration with storage class specifier "
2873 "does not redeclare tag");
2875 pending_xref_error ();
2877 else if (!declspecs->tag_defined_p
2878 && (declspecs->const_p
2879 || declspecs->volatile_p
2880 || declspecs->restrict_p))
2883 pedwarn ("empty declaration with type qualifier "
2884 "does not redeclare tag");
2886 pending_xref_error ();
2890 pending_invalid_xref = 0;
2891 t = lookup_tag (code, name, 1);
2895 t = make_node (code);
2902 if (warned != 1 && !in_system_header)
2904 pedwarn ("useless type name in empty declaration");
2909 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2911 pedwarn ("useless type name in empty declaration");
2915 pending_invalid_xref = 0;
2917 if (declspecs->inline_p)
2919 error ("%<inline%> in empty declaration");
2923 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2925 error ("%<auto%> in file-scope empty declaration");
2929 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2931 error ("%<register%> in file-scope empty declaration");
2935 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2937 warning (0, "useless storage class specifier in empty declaration");
2941 if (!warned && !in_system_header && declspecs->thread_p)
2943 warning (0, "useless %<__thread%> in empty declaration");
2947 if (!warned && !in_system_header && (declspecs->const_p
2948 || declspecs->volatile_p
2949 || declspecs->restrict_p))
2951 warning (0, "useless type qualifier in empty declaration");
2958 pedwarn ("empty declaration");
2963 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2964 bits. SPECS represents declaration specifiers that the grammar
2965 only permits to contain type qualifiers and attributes. */
2968 quals_from_declspecs (const struct c_declspecs *specs)
2970 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2971 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2972 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2973 gcc_assert (!specs->type
2974 && !specs->decl_attr
2975 && specs->typespec_word == cts_none
2976 && specs->storage_class == csc_none
2977 && !specs->typedef_p
2978 && !specs->explicit_signed_p
2979 && !specs->deprecated_p
2981 && !specs->long_long_p
2984 && !specs->unsigned_p
2985 && !specs->complex_p
2987 && !specs->thread_p);
2991 /* Construct an array declarator. EXPR is the expression inside [], or
2992 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2993 to the pointer to which a parameter array is converted). STATIC_P is
2994 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2995 is true if the array is [*], a VLA of unspecified length which is
2996 nevertheless a complete type (not currently implemented by GCC),
2997 false otherwise. The field for the contained declarator is left to be
2998 filled in by set_array_declarator_inner. */
3000 struct c_declarator *
3001 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3004 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3005 struct c_declarator);
3006 declarator->kind = cdk_array;
3007 declarator->declarator = 0;
3008 declarator->u.array.dimen = expr;
3011 declarator->u.array.attrs = quals->attrs;
3012 declarator->u.array.quals = quals_from_declspecs (quals);
3016 declarator->u.array.attrs = NULL_TREE;
3017 declarator->u.array.quals = 0;
3019 declarator->u.array.static_p = static_p;
3020 declarator->u.array.vla_unspec_p = vla_unspec_p;
3021 if (pedantic && !flag_isoc99)
3023 if (static_p || quals != NULL)
3024 pedwarn ("ISO C90 does not support %<static%> or type "
3025 "qualifiers in parameter array declarators");
3027 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3030 warning (0, "GCC does not yet properly implement %<[*]%> array declarators");
3034 /* Set the contained declarator of an array declarator. DECL is the
3035 declarator, as constructed by build_array_declarator; INNER is what
3036 appears on the left of the []. ABSTRACT_P is true if it is an
3037 abstract declarator, false otherwise; this is used to reject static
3038 and type qualifiers in abstract declarators, where they are not in
3039 the C99 grammar (subject to possible change in DR#289). */
3041 struct c_declarator *
3042 set_array_declarator_inner (struct c_declarator *decl,
3043 struct c_declarator *inner, bool abstract_p)
3045 decl->declarator = inner;
3046 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
3047 || decl->u.array.attrs != NULL_TREE
3048 || decl->u.array.static_p))
3049 error ("static or type qualifiers in abstract declarator");
3053 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3056 groktypename (struct c_type_name *type_name)
3059 tree attrs = type_name->specs->attrs;
3061 type_name->specs->attrs = NULL_TREE;
3063 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3066 /* Apply attributes. */
3067 decl_attributes (&type, attrs, 0);
3072 /* Decode a declarator in an ordinary declaration or data definition.
3073 This is called as soon as the type information and variable name
3074 have been parsed, before parsing the initializer if any.
3075 Here we create the ..._DECL node, fill in its type,
3076 and put it on the list of decls for the current context.
3077 The ..._DECL node is returned as the value.
3079 Exception: for arrays where the length is not specified,
3080 the type is left null, to be filled in by `finish_decl'.
3082 Function definitions do not come here; they go to start_function
3083 instead. However, external and forward declarations of functions
3084 do go through here. Structure field declarations are done by
3085 grokfield and not through here. */
3088 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3089 bool initialized, tree attributes)
3094 /* An object declared as __attribute__((deprecated)) suppresses
3095 warnings of uses of other deprecated items. */
3096 if (lookup_attribute ("deprecated", attributes))
3097 deprecated_state = DEPRECATED_SUPPRESS;
3099 decl = grokdeclarator (declarator, declspecs,
3100 NORMAL, initialized, NULL);
3104 deprecated_state = DEPRECATED_NORMAL;
3106 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3107 && MAIN_NAME_P (DECL_NAME (decl)))
3108 warning (OPT_Wmain, "%q+D is usually a function", decl);
3111 /* Is it valid for this decl to have an initializer at all?
3112 If not, set INITIALIZED to zero, which will indirectly
3113 tell 'finish_decl' to ignore the initializer once it is parsed. */
3114 switch (TREE_CODE (decl))
3117 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3122 error ("function %qD is initialized like a variable", decl);
3127 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3128 error ("parameter %qD is initialized", decl);
3133 /* Don't allow initializations for incomplete types except for
3134 arrays which might be completed by the initialization. */
3136 /* This can happen if the array size is an undefined macro.
3137 We already gave a warning, so we don't need another one. */
3138 if (TREE_TYPE (decl) == error_mark_node)
3140 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3142 /* A complete type is ok if size is fixed. */
3144 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3145 || C_DECL_VARIABLE_SIZE (decl))
3147 error ("variable-sized object may not be initialized");
3151 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3153 error ("variable %qD has initializer but incomplete type", decl);
3156 else if (C_DECL_VARIABLE_SIZE (decl))
3158 /* Although C99 is unclear about whether incomplete arrays
3159 of VLAs themselves count as VLAs, it does not make
3160 sense to permit them to be initialized given that
3161 ordinary VLAs may not be initialized. */
3162 error ("variable-sized object may not be initialized");
3169 if (current_scope == file_scope)
3170 TREE_STATIC (decl) = 1;
3172 /* Tell 'pushdecl' this is an initialized decl
3173 even though we don't yet have the initializer expression.
3174 Also tell 'finish_decl' it may store the real initializer. */
3175 DECL_INITIAL (decl) = error_mark_node;
3178 /* If this is a function declaration, write a record describing it to the
3179 prototypes file (if requested). */
3181 if (TREE_CODE (decl) == FUNCTION_DECL)
3182 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3184 /* ANSI specifies that a tentative definition which is not merged with
3185 a non-tentative definition behaves exactly like a definition with an
3186 initializer equal to zero. (Section 3.7.2)
3188 -fno-common gives strict ANSI behavior, though this tends to break
3189 a large body of code that grew up without this rule.
3191 Thread-local variables are never common, since there's no entrenched
3192 body of code to break, and it allows more efficient variable references
3193 in the presence of dynamic linking. */
3195 if (TREE_CODE (decl) == VAR_DECL
3197 && TREE_PUBLIC (decl)
3198 && !DECL_THREAD_LOCAL_P (decl)
3200 DECL_COMMON (decl) = 1;
3202 /* Set attributes here so if duplicate decl, will have proper attributes. */
3203 decl_attributes (&decl, attributes, 0);
3205 if (TREE_CODE (decl) == FUNCTION_DECL
3206 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3208 struct c_declarator *ce = declarator;
3210 if (ce->kind == cdk_pointer)
3211 ce = declarator->declarator;
3212 if (ce->kind == cdk_function)
3214 tree args = ce->u.arg_info->parms;
3215 for (; args; args = TREE_CHAIN (args))
3217 tree type = TREE_TYPE (args);
3218 if (type && INTEGRAL_TYPE_P (type)
3219 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3220 DECL_ARG_TYPE (args) = integer_type_node;
3225 if (TREE_CODE (decl) == FUNCTION_DECL
3226 && DECL_DECLARED_INLINE_P (decl)
3227 && DECL_UNINLINABLE (decl)
3228 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3229 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3232 /* Add this decl to the current scope.
3233 TEM may equal DECL or it may be a previous decl of the same name. */
3234 tem = pushdecl (decl);
3236 if (initialized && DECL_EXTERNAL (tem))
3238 DECL_EXTERNAL (tem) = 0;
3239 TREE_STATIC (tem) = 1;
3245 /* Finish processing of a declaration;
3246 install its initial value.
3247 If the length of an array type is not known before,
3248 it must be determined now, from the initial value, or it is an error. */
3251 finish_decl (tree decl, tree init, tree asmspec_tree)
3253 tree type = TREE_TYPE (decl);
3254 int was_incomplete = (DECL_SIZE (decl) == 0);
3255 const char *asmspec = 0;
3257 /* If a name was specified, get the string. */
3258 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3259 && DECL_FILE_SCOPE_P (decl))
3260 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3262 asmspec = TREE_STRING_POINTER (asmspec_tree);
3264 /* If `start_decl' didn't like having an initialization, ignore it now. */
3265 if (init != 0 && DECL_INITIAL (decl) == 0)
3268 /* Don't crash if parm is initialized. */
3269 if (TREE_CODE (decl) == PARM_DECL)
3273 store_init_value (decl, init);
3275 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3276 || TREE_CODE (decl) == FUNCTION_DECL
3277 || TREE_CODE (decl) == FIELD_DECL))
3278 objc_check_decl (decl);
3280 /* Deduce size of array from initialization, if not already known. */
3281 if (TREE_CODE (type) == ARRAY_TYPE
3282 && TYPE_DOMAIN (type) == 0
3283 && TREE_CODE (decl) != TYPE_DECL)
3286 = (TREE_STATIC (decl)
3287 /* Even if pedantic, an external linkage array
3288 may have incomplete type at first. */
3289 ? pedantic && !TREE_PUBLIC (decl)
3290 : !DECL_EXTERNAL (decl));
3292 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3295 /* Get the completed type made by complete_array_type. */
3296 type = TREE_TYPE (decl);
3301 error ("initializer fails to determine size of %q+D", decl);
3306 error ("array size missing in %q+D", decl);
3307 /* If a `static' var's size isn't known,
3308 make it extern as well as static, so it does not get
3310 If it is not `static', then do not mark extern;
3311 finish_incomplete_decl will give it a default size
3312 and it will get allocated. */
3313 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3314 DECL_EXTERNAL (decl) = 1;
3318 error ("zero or negative size array %q+D", decl);
3322 /* For global variables, update the copy of the type that
3323 exists in the binding. */
3324 if (TREE_PUBLIC (decl))
3326 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3327 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3328 b_ext = b_ext->shadowed;
3332 b_ext->type = composite_type (b_ext->type, type);
3343 if (DECL_INITIAL (decl))
3344 TREE_TYPE (DECL_INITIAL (decl)) = type;
3346 layout_decl (decl, 0);
3349 if (TREE_CODE (decl) == VAR_DECL)
3351 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3352 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3353 layout_decl (decl, 0);
3355 if (DECL_SIZE (decl) == 0
3356 /* Don't give an error if we already gave one earlier. */
3357 && TREE_TYPE (decl) != error_mark_node
3358 && (TREE_STATIC (decl)
3359 /* A static variable with an incomplete type
3360 is an error if it is initialized.
3361 Also if it is not file scope.
3362 Otherwise, let it through, but if it is not `extern'
3363 then it may cause an error message later. */
3364 ? (DECL_INITIAL (decl) != 0
3365 || !DECL_FILE_SCOPE_P (decl))
3366 /* An automatic variable with an incomplete type
3368 : !DECL_EXTERNAL (decl)))
3370 error ("storage size of %q+D isn%'t known", decl);
3371 TREE_TYPE (decl) = error_mark_node;
3374 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3375 && DECL_SIZE (decl) != 0)
3377 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3378 constant_expression_warning (DECL_SIZE (decl));
3380 error ("storage size of %q+D isn%'t constant", decl);
3383 if (TREE_USED (type))
3384 TREE_USED (decl) = 1;
3387 /* If this is a function and an assembler name is specified, reset DECL_RTL
3388 so we can give it its new name. Also, update built_in_decls if it
3389 was a normal built-in. */
3390 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3392 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3393 set_builtin_user_assembler_name (decl, asmspec);
3394 set_user_assembler_name (decl, asmspec);
3397 /* If #pragma weak was used, mark the decl weak now. */
3398 maybe_apply_pragma_weak (decl);
3400 /* If this is a variable definition, determine its ELF visibility. */
3401 if (TREE_CODE (decl) == VAR_DECL
3402 && TREE_STATIC (decl)
3403 && !DECL_EXTERNAL (decl))
3404 c_determine_visibility (decl);
3406 /* Output the assembler code and/or RTL code for variables and functions,
3407 unless the type is an undefined structure or union.
3408 If not, it will get done when the type is completed. */
3410 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3412 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3413 if (c_dialect_objc ())
3414 objc_check_decl (decl);
3418 /* If this is not a static variable, issue a warning.
3419 It doesn't make any sense to give an ASMSPEC for an
3420 ordinary, non-register local variable. Historically,
3421 GCC has accepted -- but ignored -- the ASMSPEC in
3423 if (!DECL_FILE_SCOPE_P (decl)
3424 && TREE_CODE (decl) == VAR_DECL
3425 && !C_DECL_REGISTER (decl)
3426 && !TREE_STATIC (decl))
3427 warning (0, "ignoring asm-specifier for non-static local "
3428 "variable %q+D", decl);
3430 set_user_assembler_name (decl, asmspec);
3433 if (DECL_FILE_SCOPE_P (decl))
3435 if (DECL_INITIAL (decl) == NULL_TREE
3436 || DECL_INITIAL (decl) == error_mark_node)
3437 /* Don't output anything
3438 when a tentative file-scope definition is seen.
3439 But at end of compilation, do output code for them. */
3440 DECL_DEFER_OUTPUT (decl) = 1;
3441 rest_of_decl_compilation (decl, true, 0);
3445 /* In conjunction with an ASMSPEC, the `register'
3446 keyword indicates that we should place the variable
3447 in a particular register. */
3448 if (asmspec && C_DECL_REGISTER (decl))
3450 DECL_HARD_REGISTER (decl) = 1;
3451 /* This cannot be done for a structure with volatile
3452 fields, on which DECL_REGISTER will have been
3454 if (!DECL_REGISTER (decl))
3455 error ("cannot put object with volatile field into register");
3458 if (TREE_CODE (decl) != FUNCTION_DECL)
3460 /* If we're building a variable sized type, and we might be
3461 reachable other than via the top of the current binding
3462 level, then create a new BIND_EXPR so that we deallocate
3463 the object at the right time. */
3464 /* Note that DECL_SIZE can be null due to errors. */
3465 if (DECL_SIZE (decl)
3466 && !TREE_CONSTANT (DECL_SIZE (decl))
3467 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3470 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3471 TREE_SIDE_EFFECTS (bind) = 1;
3473 BIND_EXPR_BODY (bind) = push_stmt_list ();
3475 add_stmt (build_stmt (DECL_EXPR, decl));
3480 if (!DECL_FILE_SCOPE_P (decl))
3482 /* Recompute the RTL of a local array now
3483 if it used to be an incomplete type. */
3485 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3487 /* If we used it already as memory, it must stay in memory. */
3488 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3489 /* If it's still incomplete now, no init will save it. */
3490 if (DECL_SIZE (decl) == 0)
3491 DECL_INITIAL (decl) = 0;
3496 /* If this was marked 'used', be sure it will be output. */
3497 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3498 mark_decl_referenced (decl);
3500 if (TREE_CODE (decl) == TYPE_DECL)
3502 if (!DECL_FILE_SCOPE_P (decl)
3503 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3504 add_stmt (build_stmt (DECL_EXPR, decl));
3506 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3509 /* At the end of a declaration, throw away any variable type sizes
3510 of types defined inside that declaration. There is no use
3511 computing them in the following function definition. */
3512 if (current_scope == file_scope)
3513 get_pending_sizes ();
3515 /* Install a cleanup (aka destructor) if one was given. */
3516 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3518 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3521 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3522 tree cleanup_decl = lookup_name (cleanup_id);
3525 /* Build "cleanup(&decl)" for the destructor. */
3526 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3527 cleanup = build_tree_list (NULL_TREE, cleanup);
3528 cleanup = build_function_call (cleanup_decl, cleanup);
3530 /* Don't warn about decl unused; the cleanup uses it. */
3531 TREE_USED (decl) = 1;
3532 TREE_USED (cleanup_decl) = 1;
3534 /* Initialize EH, if we've been told to do so. */
3535 if (flag_exceptions && !c_eh_initialized_p)
3537 c_eh_initialized_p = true;
3538 eh_personality_libfunc
3539 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3540 ? "__gcc_personality_sj0"
3541 : "__gcc_personality_v0");
3542 default_init_unwind_resume_libfunc ();
3543 using_eh_for_cleanups ();
3546 push_cleanup (decl, cleanup, false);
3551 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3554 grokparm (const struct c_parm *parm)
3556 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3559 decl_attributes (&decl, parm->attrs, 0);
3564 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3565 and push that on the current scope. */
3568 push_parm_decl (const struct c_parm *parm)
3572 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3573 decl_attributes (&decl, parm->attrs, 0);
3575 decl = pushdecl (decl);
3577 finish_decl (decl, NULL_TREE, NULL_TREE);
3580 /* Mark all the parameter declarations to date as forward decls.
3581 Also diagnose use of this extension. */
3584 mark_forward_parm_decls (void)
3586 struct c_binding *b;
3588 if (pedantic && !current_scope->warned_forward_parm_decls)
3590 pedwarn ("ISO C forbids forward parameter declarations");
3591 current_scope->warned_forward_parm_decls = true;
3594 for (b = current_scope->bindings; b; b = b->prev)
3595 if (TREE_CODE (b->decl) == PARM_DECL)
3596 TREE_ASM_WRITTEN (b->decl) = 1;
3599 static GTY(()) int compound_literal_number;
3601 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3602 literal, which may be an incomplete array type completed by the
3603 initializer; INIT is a CONSTRUCTOR that initializes the compound
3607 build_compound_literal (tree type, tree init)
3609 /* We do not use start_decl here because we have a type, not a declarator;
3610 and do not use finish_decl because the decl should be stored inside
3611 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3616 if (type == error_mark_node)
3617 return error_mark_node;
3619 decl = build_decl (VAR_DECL, NULL_TREE, type);
3620 DECL_EXTERNAL (decl) = 0;
3621 TREE_PUBLIC (decl) = 0;
3622 TREE_STATIC (decl) = (current_scope == file_scope);
3623 DECL_CONTEXT (decl) = current_function_decl;
3624 TREE_USED (decl) = 1;
3625 TREE_TYPE (decl) = type;
3626 TREE_READONLY (decl) = TYPE_READONLY (type);
3627 store_init_value (decl, init);
3629 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3631 int failure = complete_array_type (&TREE_TYPE (decl),
3632 DECL_INITIAL (decl), true);
3633 gcc_assert (!failure);
3635 type = TREE_TYPE (decl);
3636 TREE_TYPE (DECL_INITIAL (decl)) = type;
3639 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3640 return error_mark_node;
3642 stmt = build_stmt (DECL_EXPR, decl);
3643 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3644 TREE_SIDE_EFFECTS (complit) = 1;
3646 layout_decl (decl, 0);
3648 if (TREE_STATIC (decl))
3650 /* This decl needs a name for the assembler output. We also need
3651 a unique suffix to be added to the name. */
3654 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3655 compound_literal_number);
3656 compound_literal_number++;
3657 DECL_NAME (decl) = get_identifier (name);
3658 DECL_DEFER_OUTPUT (decl) = 1;
3659 DECL_COMDAT (decl) = 1;
3660 DECL_ARTIFICIAL (decl) = 1;
3661 DECL_IGNORED_P (decl) = 1;
3663 rest_of_decl_compilation (decl, 1, 0);
3669 /* Determine whether TYPE is a structure with a flexible array member,
3670 or a union containing such a structure (possibly recursively). */
3673 flexible_array_type_p (tree type)
3676 switch (TREE_CODE (type))
3679 x = TYPE_FIELDS (type);
3682 while (TREE_CHAIN (x) != NULL_TREE)
3684 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3685 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3686 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3687 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3691 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3693 if (flexible_array_type_p (TREE_TYPE (x)))
3702 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3703 replacing with appropriate values if they are invalid. */
3705 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3708 unsigned int max_width;
3709 unsigned HOST_WIDE_INT w;
3710 const char *name = orig_name ? orig_name: _("<anonymous>");
3712 /* Detect and ignore out of range field width and process valid
3714 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3715 || TREE_CODE (*width) != INTEGER_CST)
3717 error ("bit-field %qs width not an integer constant", name);
3718 *width = integer_one_node;
3722 constant_expression_warning (*width);
3723 if (tree_int_cst_sgn (*width) < 0)
3725 error ("negative width in bit-field %qs", name);
3726 *width = integer_one_node;
3728 else if (integer_zerop (*width) && orig_name)
3730 error ("zero width for bit-field %qs", name);
3731 *width = integer_one_node;
3735 /* Detect invalid bit-field type. */
3736 if (TREE_CODE (*type) != INTEGER_TYPE
3737 && TREE_CODE (*type) != BOOLEAN_TYPE
3738 && TREE_CODE (*type) != ENUMERAL_TYPE)
3740 error ("bit-field %qs has invalid type", name);
3741 *type = unsigned_type_node;
3744 type_mv = TYPE_MAIN_VARIANT (*type);
3746 && type_mv != integer_type_node
3747 && type_mv != unsigned_type_node
3748 && type_mv != boolean_type_node)
3749 pedwarn ("type of bit-field %qs is a GCC extension", name);
3751 if (type_mv == boolean_type_node)
3752 max_width = CHAR_TYPE_SIZE;
3754 max_width = TYPE_PRECISION (*type);
3756 if (0 < compare_tree_int (*width, max_width))
3758 error ("width of %qs exceeds its type", name);
3760 *width = build_int_cst (NULL_TREE, w);
3763 w = tree_low_cst (*width, 1);
3765 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3767 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3769 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3770 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3771 warning (0, "%qs is narrower than values of its type", name);
3775 /* Build a bit-field integer type for the given WIDTH and UNSIGNEDP. */
3777 c_build_bitfield_integer_type (unsigned HOST_WIDE_INT width, int unsignedp)
3779 /* Extended integer types of the same width as a standard type have
3780 lesser rank, so those of the same width as int promote to int or
3781 unsigned int and are valid for printf formats expecting int or
3782 unsigned int. To avoid such special cases, avoid creating
3783 extended integer types for bit-fields if a standard integer type
3785 if (width == TYPE_PRECISION (integer_type_node))
3786 return unsignedp ? unsigned_type_node : integer_type_node;
3787 if (width == TYPE_PRECISION (signed_char_type_node))
3788 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3789 if (width == TYPE_PRECISION (short_integer_type_node))
3790 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3791 if (width == TYPE_PRECISION (long_integer_type_node))
3792 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3793 if (width == TYPE_PRECISION (long_long_integer_type_node))
3794 return (unsignedp ? long_long_unsigned_type_node
3795 : long_long_integer_type_node);
3796 return build_nonstandard_integer_type (width, unsignedp);
3799 /* Given declspecs and a declarator,
3800 determine the name and type of the object declared
3801 and construct a ..._DECL node for it.
3802 (In one case we can return a ..._TYPE node instead.
3803 For invalid input we sometimes return 0.)
3805 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3807 DECL_CONTEXT says which syntactic context this declaration is in:
3808 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3809 FUNCDEF for a function definition. Like NORMAL but a few different
3810 error messages in each case. Return value may be zero meaning
3811 this definition is too screwy to try to parse.
3812 PARM for a parameter declaration (either within a function prototype
3813 or before a function body). Make a PARM_DECL, or return void_type_node.
3814 TYPENAME if for a typename (in a cast or sizeof).
3815 Don't make a DECL node; just return the ..._TYPE node.
3816 FIELD for a struct or union field; make a FIELD_DECL.
3817 INITIALIZED is true if the decl has an initializer.
3818 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3819 representing the width of the bit-field.
3821 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3822 It may also be so in the PARM case, for a prototype where the
3823 argument type is specified but not the name.
3825 This function is where the complicated C meanings of `static'
3826 and `extern' are interpreted. */
3829 grokdeclarator (const struct c_declarator *declarator,
3830 struct c_declspecs *declspecs,
3831 enum decl_context decl_context, bool initialized, tree *width)
3833 tree type = declspecs->type;
3834 bool threadp = declspecs->thread_p;
3835 enum c_storage_class storage_class = declspecs->storage_class;
3839 int type_quals = TYPE_UNQUALIFIED;
3840 const char *name, *orig_name;
3841 tree typedef_type = 0;
3842 int funcdef_flag = 0;
3843 bool funcdef_syntax = false;
3844 int size_varies = 0;
3845 tree decl_attr = declspecs->decl_attr;
3846 int array_ptr_quals = TYPE_UNQUALIFIED;
3847 tree array_ptr_attrs = NULL_TREE;
3848 int array_parm_static = 0;
3849 tree returned_attrs = NULL_TREE;
3850 bool bitfield = width != NULL;
3852 struct c_arg_info *arg_info = 0;
3854 if (decl_context == FUNCDEF)
3855 funcdef_flag = 1, decl_context = NORMAL;
3857 /* Look inside a declarator for the name being declared
3858 and get it as a string, for an error message. */
3860 const struct c_declarator *decl = declarator;
3869 funcdef_syntax = (decl->kind == cdk_function);
3870 decl = decl->declarator;
3874 decl = decl->declarator;
3879 name = IDENTIFIER_POINTER (decl->u.id);
3891 /* A function definition's declarator must have the form of
3892 a function declarator. */
3894 if (funcdef_flag && !funcdef_syntax)
3897 /* If this looks like a function definition, make it one,
3898 even if it occurs where parms are expected.
3899 Then store_parm_decls will reject it and not use it as a parm. */
3900 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3901 decl_context = PARM;
3903 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3904 warn_deprecated_use (declspecs->type);
3906 typedef_type = type;
3907 size_varies = C_TYPE_VARIABLE_SIZE (type);
3909 /* Diagnose defaulting to "int". */
3911 if (declspecs->default_int_p && !in_system_header)
3913 /* Issue a warning if this is an ISO C 99 program or if
3914 -Wreturn-type and this is a function, or if -Wimplicit;
3915 prefer the former warning since it is more explicit. */
3916 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3918 warn_about_return_type = 1;
3919 else if (warn_implicit_int || flag_isoc99)
3920 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3923 /* Adjust the type if a bit-field is being declared,
3924 -funsigned-bitfields applied and the type is not explicitly
3926 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
3927 && TREE_CODE (type) == INTEGER_TYPE)
3928 type = c_common_unsigned_type (type);
3930 /* Figure out the type qualifiers for the declaration. There are
3931 two ways a declaration can become qualified. One is something
3932 like `const int i' where the `const' is explicit. Another is
3933 something like `typedef const int CI; CI i' where the type of the
3934 declaration contains the `const'. A third possibility is that
3935 there is a type qualifier on the element type of a typedefed
3936 array type, in which case we should extract that qualifier so
3937 that c_apply_type_quals_to_decls receives the full list of
3938 qualifiers to work with (C90 is not entirely clear about whether
3939 duplicate qualifiers should be diagnosed in this case, but it
3940 seems most appropriate to do so). */
3941 element_type = strip_array_types (type);
3942 constp = declspecs->const_p + TYPE_READONLY (element_type);
3943 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
3944 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
3945 if (pedantic && !flag_isoc99)
3948 pedwarn ("duplicate %<const%>");
3950 pedwarn ("duplicate %<restrict%>");
3952 pedwarn ("duplicate %<volatile%>");
3954 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
3955 type = TYPE_MAIN_VARIANT (type);
3956 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3957 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3958 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3960 /* Warn about storage classes that are invalid for certain
3961 kinds of declarations (parameters, typenames, etc.). */
3965 || storage_class == csc_auto
3966 || storage_class == csc_register
3967 || storage_class == csc_typedef))
3969 if (storage_class == csc_auto
3970 && (pedantic || current_scope == file_scope))
3971 pedwarn ("function definition declared %<auto%>");
3972 if (storage_class == csc_register)
3973 error ("function definition declared %<register%>");
3974 if (storage_class == csc_typedef)
3975 error ("function definition declared %<typedef%>");
3977 error ("function definition declared %<__thread%>");
3979 if (storage_class == csc_auto
3980 || storage_class == csc_register
3981 || storage_class == csc_typedef)
3982 storage_class = csc_none;
3984 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
3986 if (decl_context == PARM && storage_class == csc_register)
3990 switch (decl_context)
3993 error ("storage class specified for structure field %qs",
3997 error ("storage class specified for parameter %qs", name);
4000 error ("storage class specified for typename");
4003 storage_class = csc_none;
4007 else if (storage_class == csc_extern
4011 /* 'extern' with initialization is invalid if not at file scope. */
4012 if (current_scope == file_scope)
4013 warning (0, "%qs initialized and declared %<extern%>", name);
4015 error ("%qs has both %<extern%> and initializer", name);
4017 else if (current_scope == file_scope)
4019 if (storage_class == csc_auto)
4020 error ("file-scope declaration of %qs specifies %<auto%>", name);
4021 if (pedantic && storage_class == csc_register)
4022 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
4026 if (storage_class == csc_extern && funcdef_flag)
4027 error ("nested function %qs declared %<extern%>", name);
4028 else if (threadp && storage_class == csc_none)
4030 error ("function-scope %qs implicitly auto and declared "
4037 /* Now figure out the structure of the declarator proper.
4038 Descend through it, creating more complex types, until we reach
4039 the declared identifier (or NULL_TREE, in an absolute declarator).
4040 At each stage we maintain an unqualified version of the type
4041 together with any qualifiers that should be applied to it with
4042 c_build_qualified_type; this way, array types including
4043 multidimensional array types are first built up in unqualified
4044 form and then the qualified form is created with
4045 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4047 while (declarator && declarator->kind != cdk_id)
4049 if (type == error_mark_node)
4051 declarator = declarator->declarator;
4055 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4056 a cdk_pointer (for *...),
4057 a cdk_function (for ...(...)),
4058 a cdk_attrs (for nested attributes),
4059 or a cdk_id (for the name being declared
4060 or the place in an absolute declarator
4061 where the name was omitted).
4062 For the last case, we have just exited the loop.
4064 At this point, TYPE is the type of elements of an array,
4065 or for a function to return, or for a pointer to point to.
4066 After this sequence of ifs, TYPE is the type of the
4067 array or function or pointer, and DECLARATOR has had its
4068 outermost layer removed. */
4070 if (array_ptr_quals != TYPE_UNQUALIFIED
4071 || array_ptr_attrs != NULL_TREE
4072 || array_parm_static)
4074 /* Only the innermost declarator (making a parameter be of
4075 array type which is converted to pointer type)
4076 may have static or type qualifiers. */
4077 error ("static or type qualifiers in non-parameter array declarator");
4078 array_ptr_quals = TYPE_UNQUALIFIED;
4079 array_ptr_attrs = NULL_TREE;
4080 array_parm_static = 0;
4083 switch (declarator->kind)
4087 /* A declarator with embedded attributes. */
4088 tree attrs = declarator->u.attrs;
4089 const struct c_declarator *inner_decl;
4091 declarator = declarator->declarator;
4092 inner_decl = declarator;
4093 while (inner_decl->kind == cdk_attrs)
4094 inner_decl = inner_decl->declarator;
4095 if (inner_decl->kind == cdk_id)
4096 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4097 else if (inner_decl->kind == cdk_function)
4098 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4099 else if (inner_decl->kind == cdk_array)
4100 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4101 returned_attrs = decl_attributes (&type,
4102 chainon (returned_attrs, attrs),
4108 tree itype = NULL_TREE;
4109 tree size = declarator->u.array.dimen;
4110 /* The index is a signed object `sizetype' bits wide. */
4111 tree index_type = c_common_signed_type (sizetype);
4113 array_ptr_quals = declarator->u.array.quals;
4114 array_ptr_attrs = declarator->u.array.attrs;
4115 array_parm_static = declarator->u.array.static_p;
4117 declarator = declarator->declarator;
4119 /* Check for some types that there cannot be arrays of. */
4121 if (VOID_TYPE_P (type))
4123 error ("declaration of %qs as array of voids", name);
4124 type = error_mark_node;
4127 if (TREE_CODE (type) == FUNCTION_TYPE)
4129 error ("declaration of %qs as array of functions", name);
4130 type = error_mark_node;
4133 if (pedantic && !in_system_header && flexible_array_type_p (type))
4134 pedwarn ("invalid use of structure with flexible array member");
4136 if (size == error_mark_node)
4137 type = error_mark_node;
4139 if (type == error_mark_node)
4142 /* If size was specified, set ITYPE to a range-type for
4143 that size. Otherwise, ITYPE remains null. finish_decl
4144 may figure it out from an initial value. */
4148 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4150 STRIP_TYPE_NOPS (size);
4152 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4154 error ("size of array %qs has non-integer type", name);
4155 size = integer_one_node;
4158 if (pedantic && integer_zerop (size))
4159 pedwarn ("ISO C forbids zero-size array %qs", name);
4161 if (TREE_CODE (size) == INTEGER_CST)
4163 constant_expression_warning (size);
4164 if (tree_int_cst_sgn (size) < 0)
4166 error ("size of array %qs is negative", name);
4167 size = integer_one_node;
4172 /* Make sure the array size remains visibly
4173 nonconstant even if it is (eg) a const variable
4174 with known value. */
4177 if (!flag_isoc99 && pedantic)
4179 if (TREE_CONSTANT (size))
4180 pedwarn ("ISO C90 forbids array %qs whose size "
4181 "can%'t be evaluated",
4184 pedwarn ("ISO C90 forbids variable-size array %qs",
4189 if (integer_zerop (size))
4191 /* A zero-length array cannot be represented with
4192 an unsigned index type, which is what we'll
4193 get with build_index_type. Create an
4194 open-ended range instead. */
4195 itype = build_range_type (sizetype, size, NULL_TREE);
4199 /* Arrange for the SAVE_EXPR on the inside of the
4200 MINUS_EXPR, which allows the -1 to get folded
4201 with the +1 that happens when building TYPE_SIZE. */
4203 size = variable_size (size);
4205 /* Compute the maximum valid index, that is, size
4206 - 1. Do the calculation in index_type, so that
4207 if it is a variable the computations will be
4208 done in the proper mode. */
4209 itype = fold_build2 (MINUS_EXPR, index_type,
4210 convert (index_type, size),
4211 convert (index_type,
4214 /* If that overflowed, the array is too big. ???
4215 While a size of INT_MAX+1 technically shouldn't
4216 cause an overflow (because we subtract 1), the
4217 overflow is recorded during the conversion to
4218 index_type, before the subtraction. Handling
4219 this case seems like an unnecessary
4221 if (TREE_CODE (itype) == INTEGER_CST
4222 && TREE_OVERFLOW (itype))
4224 error ("size of array %qs is too large", name);
4225 type = error_mark_node;
4229 itype = build_index_type (itype);
4232 else if (decl_context == FIELD)
4234 if (pedantic && !flag_isoc99 && !in_system_header)
4235 pedwarn ("ISO C90 does not support flexible array members");
4237 /* ISO C99 Flexible array members are effectively
4238 identical to GCC's zero-length array extension. */
4239 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4242 /* Complain about arrays of incomplete types. */
4243 if (!COMPLETE_TYPE_P (type))
4245 error ("array type has incomplete element type");
4246 type = error_mark_node;
4249 type = build_array_type (type, itype);
4252 C_TYPE_VARIABLE_SIZE (type) = 1;
4254 /* The GCC extension for zero-length arrays differs from
4255 ISO flexible array members in that sizeof yields
4257 if (size && integer_zerop (size))
4259 TYPE_SIZE (type) = bitsize_zero_node;
4260 TYPE_SIZE_UNIT (type) = size_zero_node;
4263 if (decl_context != PARM
4264 && (array_ptr_quals != TYPE_UNQUALIFIED
4265 || array_ptr_attrs != NULL_TREE
4266 || array_parm_static))
4268 error ("static or type qualifiers in non-parameter array declarator");
4269 array_ptr_quals = TYPE_UNQUALIFIED;
4270 array_ptr_attrs = NULL_TREE;
4271 array_parm_static = 0;
4277 /* Say it's a definition only for the declarator closest
4278 to the identifier, apart possibly from some
4280 bool really_funcdef = false;
4284 const struct c_declarator *t = declarator->declarator;
4285 while (t->kind == cdk_attrs)
4287 really_funcdef = (t->kind == cdk_id);
4290 /* Declaring a function type. Make sure we have a valid
4291 type for the function to return. */
4292 if (type == error_mark_node)
4297 /* Warn about some types functions can't return. */
4298 if (TREE_CODE (type) == FUNCTION_TYPE)
4300 error ("%qs declared as function returning a function", name);
4301 type = integer_type_node;
4303 if (TREE_CODE (type) == ARRAY_TYPE)
4305 error ("%qs declared as function returning an array", name);
4306 type = integer_type_node;
4309 /* Construct the function type and go to the next
4310 inner layer of declarator. */
4311 arg_info = declarator->u.arg_info;
4312 arg_types = grokparms (arg_info, really_funcdef);
4314 /* Type qualifiers before the return type of the function
4315 qualify the return type, not the function type. */
4318 /* Type qualifiers on a function return type are
4319 normally permitted by the standard but have no
4320 effect, so give a warning at -Wreturn-type.
4321 Qualifiers on a void return type are banned on
4322 function definitions in ISO C; GCC used to used
4323 them for noreturn functions. */
4324 if (VOID_TYPE_P (type) && really_funcdef)
4325 pedwarn ("function definition has qualified void return type");
4327 warning (OPT_Wreturn_type,
4328 "type qualifiers ignored on function return type");
4330 type = c_build_qualified_type (type, type_quals);
4332 type_quals = TYPE_UNQUALIFIED;
4334 type = build_function_type (type, arg_types);
4335 declarator = declarator->declarator;
4337 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4338 the formal parameter list of this FUNCTION_TYPE to point to
4339 the FUNCTION_TYPE node itself. */
4343 for (link = arg_info->tags;
4345 link = TREE_CHAIN (link))
4346 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4352 /* Merge any constancy or volatility into the target type
4355 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4357 pedwarn ("ISO C forbids qualified function types");
4359 type = c_build_qualified_type (type, type_quals);
4362 type = build_pointer_type (type);
4364 /* Process type qualifiers (such as const or volatile)
4365 that were given inside the `*'. */
4366 type_quals = declarator->u.pointer_quals;
4368 declarator = declarator->declarator;
4376 /* Now TYPE has the actual type, apart from any qualifiers in
4379 /* Check the type and width of a bit-field. */
4381 check_bitfield_type_and_width (&type, width, orig_name);
4383 /* Did array size calculations overflow? */
4385 if (TREE_CODE (type) == ARRAY_TYPE
4386 && COMPLETE_TYPE_P (type)
4387 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4388 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4390 error ("size of array %qs is too large", name);
4391 /* If we proceed with the array type as it is, we'll eventually
4392 crash in tree_low_cst(). */
4393 type = error_mark_node;
4396 /* If this is declaring a typedef name, return a TYPE_DECL. */
4398 if (storage_class == csc_typedef)
4401 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4403 pedwarn ("ISO C forbids qualified function types");
4405 type = c_build_qualified_type (type, type_quals);
4406 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4407 if (declspecs->explicit_signed_p)
4408 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4409 decl_attributes (&decl, returned_attrs, 0);
4410 if (declspecs->inline_p)
4411 pedwarn ("typedef %q+D declared %<inline%>", decl);
4415 /* Detect the case of an array type of unspecified size
4416 which came, as such, direct from a typedef name.
4417 We must copy the type, so that each identifier gets
4418 a distinct type, so that each identifier's size can be
4419 controlled separately by its own initializer. */
4421 if (type != 0 && typedef_type != 0
4422 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4423 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4425 type = build_array_type (TREE_TYPE (type), 0);
4427 C_TYPE_VARIABLE_SIZE (type) = 1;
4430 /* If this is a type name (such as, in a cast or sizeof),
4431 compute the type and return it now. */
4433 if (decl_context == TYPENAME)
4435 /* Note that the grammar rejects storage classes in typenames
4437 gcc_assert (storage_class == csc_none && !threadp
4438 && !declspecs->inline_p);
4439 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4441 pedwarn ("ISO C forbids const or volatile function types");
4443 type = c_build_qualified_type (type, type_quals);
4444 decl_attributes (&type, returned_attrs, 0);
4448 /* Aside from typedefs and type names (handle above),
4449 `void' at top level (not within pointer)
4450 is allowed only in public variables.
4451 We don't complain about parms either, but that is because
4452 a better error message can be made later. */
4454 if (VOID_TYPE_P (type) && decl_context != PARM
4455 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4456 && (storage_class == csc_extern
4457 || (current_scope == file_scope
4458 && !(storage_class == csc_static
4459 || storage_class == csc_register)))))
4461 error ("variable or field %qs declared void", name);
4462 type = integer_type_node;
4465 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4466 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4471 if (decl_context == PARM)
4473 tree type_as_written;
4476 /* A parameter declared as an array of T is really a pointer to T.
4477 One declared as a function is really a pointer to a function. */
4479 if (TREE_CODE (type) == ARRAY_TYPE)
4481 /* Transfer const-ness of array into that of type pointed to. */
4482 type = TREE_TYPE (type);
4484 type = c_build_qualified_type (type, type_quals);
4485 type = build_pointer_type (type);
4486 type_quals = array_ptr_quals;
4488 /* We don't yet implement attributes in this context. */
4489 if (array_ptr_attrs != NULL_TREE)
4490 warning (OPT_Wattributes,
4491 "attributes in parameter array declarator ignored");
4495 else if (TREE_CODE (type) == FUNCTION_TYPE)
4497 if (pedantic && type_quals)
4498 pedwarn ("ISO C forbids qualified function types");
4500 type = c_build_qualified_type (type, type_quals);
4501 type = build_pointer_type (type);
4502 type_quals = TYPE_UNQUALIFIED;
4504 else if (type_quals)
4505 type = c_build_qualified_type (type, type_quals);
4507 type_as_written = type;
4509 decl = build_decl (PARM_DECL, declarator->u.id, type);
4511 C_DECL_VARIABLE_SIZE (decl) = 1;
4513 /* Compute the type actually passed in the parmlist,
4514 for the case where there is no prototype.
4515 (For example, shorts and chars are passed as ints.)
4516 When there is a prototype, this is overridden later. */
4518 if (type == error_mark_node)
4519 promoted_type = type;
4521 promoted_type = c_type_promotes_to (type);
4523 DECL_ARG_TYPE (decl) = promoted_type;
4524 if (declspecs->inline_p)
4525 pedwarn ("parameter %q+D declared %<inline%>", decl);
4527 else if (decl_context == FIELD)
4529 /* Note that the grammar rejects storage classes in typenames
4531 gcc_assert (storage_class == csc_none && !threadp
4532 && !declspecs->inline_p);
4534 /* Structure field. It may not be a function. */
4536 if (TREE_CODE (type) == FUNCTION_TYPE)
4538 error ("field %qs declared as a function", name);
4539 type = build_pointer_type (type);
4541 else if (TREE_CODE (type) != ERROR_MARK
4542 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4544 error ("field %qs has incomplete type", name);
4545 type = error_mark_node;
4547 type = c_build_qualified_type (type, type_quals);
4548 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4549 DECL_NONADDRESSABLE_P (decl) = bitfield;
4552 C_DECL_VARIABLE_SIZE (decl) = 1;
4554 else if (TREE_CODE (type) == FUNCTION_TYPE)
4556 if (storage_class == csc_register || threadp)
4558 error ("invalid storage class for function %qs", name);
4560 else if (current_scope != file_scope)
4562 /* Function declaration not at file scope. Storage
4563 classes other than `extern' are not allowed, C99
4564 6.7.1p5, and `extern' makes no difference. However,
4565 GCC allows 'auto', perhaps with 'inline', to support
4566 nested functions. */
4567 if (storage_class == csc_auto)
4570 pedwarn ("invalid storage class for function %qs", name);
4572 else if (storage_class == csc_static)
4574 error ("invalid storage class for function %qs", name);
4576 storage_class = declspecs->storage_class = csc_none;
4582 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4583 decl = build_decl_attribute_variant (decl, decl_attr);
4585 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4587 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4588 pedwarn ("ISO C forbids qualified function types");
4590 /* GNU C interprets a volatile-qualified function type to indicate
4591 that the function does not return. */
4592 if ((type_quals & TYPE_QUAL_VOLATILE)
4593 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4594 warning (0, "%<noreturn%> function returns non-void value");
4596 /* Every function declaration is an external reference
4597 (DECL_EXTERNAL) except for those which are not at file
4598 scope and are explicitly declared "auto". This is
4599 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4600 GCC to signify a forward declaration of a nested function. */
4601 if (storage_class == csc_auto && current_scope != file_scope)
4602 DECL_EXTERNAL (decl) = 0;
4604 DECL_EXTERNAL (decl) = 1;
4606 /* Record absence of global scope for `static' or `auto'. */
4608 = !(storage_class == csc_static || storage_class == csc_auto);
4610 /* For a function definition, record the argument information
4611 block where store_parm_decls will look for it. */
4613 current_function_arg_info = arg_info;
4615 if (declspecs->default_int_p)
4616 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4618 /* Record presence of `inline', if it is reasonable. */
4619 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4621 if (declspecs->inline_p)
4622 pedwarn ("cannot inline function %<main%>");
4624 else if (declspecs->inline_p)
4626 /* Record that the function is declared `inline'. */
4627 DECL_DECLARED_INLINE_P (decl) = 1;
4629 /* Do not mark bare declarations as DECL_INLINE. Doing so
4630 in the presence of multiple declarations can result in
4631 the abstract origin pointing between the declarations,
4632 which will confuse dwarf2out. */
4635 DECL_INLINE (decl) = 1;
4636 if (storage_class == csc_extern)
4637 current_extern_inline = 1;
4640 /* If -finline-functions, assume it can be inlined. This does
4641 two things: let the function be deferred until it is actually
4642 needed, and let dwarf2 know that the function is inlinable. */
4643 else if (flag_inline_trees == 2 && initialized)
4644 DECL_INLINE (decl) = 1;
4648 /* It's a variable. */
4649 /* An uninitialized decl with `extern' is a reference. */
4650 int extern_ref = !initialized && storage_class == csc_extern;
4652 type = c_build_qualified_type (type, type_quals);
4654 /* C99 6.2.2p7: It is invalid (compile-time undefined
4655 behavior) to create an 'extern' declaration for a
4656 variable if there is a global declaration that is
4657 'static' and the global declaration is not visible.
4658 (If the static declaration _is_ currently visible,
4659 the 'extern' declaration is taken to refer to that decl.) */
4660 if (extern_ref && current_scope != file_scope)
4662 tree global_decl = identifier_global_value (declarator->u.id);
4663 tree visible_decl = lookup_name (declarator->u.id);
4666 && global_decl != visible_decl
4667 && TREE_CODE (global_decl) == VAR_DECL
4668 && !TREE_PUBLIC (global_decl))
4669 error ("variable previously declared %<static%> redeclared "
4673 decl = build_decl (VAR_DECL, declarator->u.id, type);
4674 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4676 C_DECL_VARIABLE_SIZE (decl) = 1;
4678 if (declspecs->inline_p)
4679 pedwarn ("variable %q+D declared %<inline%>", decl);
4681 /* At file scope, an initialized extern declaration may follow
4682 a static declaration. In that case, DECL_EXTERNAL will be
4683 reset later in start_decl. */
4684 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4686 /* At file scope, the presence of a `static' or `register' storage
4687 class specifier, or the absence of all storage class specifiers
4688 makes this declaration a definition (perhaps tentative). Also,
4689 the absence of both `static' and `register' makes it public. */
4690 if (current_scope == file_scope)
4692 TREE_PUBLIC (decl) = !(storage_class == csc_static
4693 || storage_class == csc_register);
4694 TREE_STATIC (decl) = !extern_ref;
4696 /* Not at file scope, only `static' makes a static definition. */
4699 TREE_STATIC (decl) = (storage_class == csc_static);
4700 TREE_PUBLIC (decl) = extern_ref;
4705 if (targetm.have_tls)
4706 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4708 /* A mere warning is sure to result in improper semantics
4709 at runtime. Don't bother to allow this to compile. */
4710 error ("thread-local storage not supported for this target");
4714 /* Record `register' declaration for warnings on &
4715 and in case doing stupid register allocation. */
4717 if (storage_class == csc_register)
4719 C_DECL_REGISTER (decl) = 1;
4720 DECL_REGISTER (decl) = 1;
4723 /* Record constancy and volatility. */
4724 c_apply_type_quals_to_decl (type_quals, decl);
4726 /* If a type has volatile components, it should be stored in memory.
4727 Otherwise, the fact that those components are volatile
4728 will be ignored, and would even crash the compiler.
4729 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4730 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4731 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4732 || TREE_CODE (decl) == RESULT_DECL))
4734 /* It is not an error for a structure with volatile fields to
4735 be declared register, but reset DECL_REGISTER since it
4736 cannot actually go in a register. */
4737 int was_reg = C_DECL_REGISTER (decl);
4738 C_DECL_REGISTER (decl) = 0;
4739 DECL_REGISTER (decl) = 0;
4740 c_mark_addressable (decl);
4741 C_DECL_REGISTER (decl) = was_reg;
4744 /* This is the earliest point at which we might know the assembler
4745 name of a variable. Thus, if it's known before this, die horribly. */
4746 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4748 decl_attributes (&decl, returned_attrs, 0);
4754 /* Decode the parameter-list info for a function type or function definition.
4755 The argument is the value returned by `get_parm_info' (or made in parse.y
4756 if there is an identifier list instead of a parameter decl list).
4757 These two functions are separate because when a function returns
4758 or receives functions then each is called multiple times but the order
4759 of calls is different. The last call to `grokparms' is always the one
4760 that contains the formal parameter names of a function definition.
4762 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4764 FUNCDEF_FLAG is true for a function definition, false for
4765 a mere declaration. A nonempty identifier-list gets an error message
4766 when FUNCDEF_FLAG is false. */
4769 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4771 tree arg_types = arg_info->types;
4773 if (arg_types == 0 && !funcdef_flag && !in_system_header)
4774 warning (OPT_Wstrict_prototypes,
4775 "function declaration isn%'t a prototype");
4777 if (arg_types == error_mark_node)
4778 return 0; /* don't set TYPE_ARG_TYPES in this case */
4780 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4783 pedwarn ("parameter names (without types) in function declaration");
4785 arg_info->parms = arg_info->types;
4786 arg_info->types = 0;
4791 tree parm, type, typelt;
4792 unsigned int parmno;
4794 /* If there is a parameter of incomplete type in a definition,
4795 this is an error. In a declaration this is valid, and a
4796 struct or union type may be completed later, before any calls
4797 or definition of the function. In the case where the tag was
4798 first declared within the parameter list, a warning has
4799 already been given. If a parameter has void type, then
4800 however the function cannot be defined or called, so
4803 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4805 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4807 type = TREE_VALUE (typelt);
4808 if (type == error_mark_node)
4811 if (!COMPLETE_TYPE_P (type))
4815 if (DECL_NAME (parm))
4816 error ("parameter %u (%q+D) has incomplete type",
4819 error ("%Jparameter %u has incomplete type",
4822 TREE_VALUE (typelt) = error_mark_node;
4823 TREE_TYPE (parm) = error_mark_node;
4825 else if (VOID_TYPE_P (type))
4827 if (DECL_NAME (parm))
4828 warning (0, "parameter %u (%q+D) has void type",
4831 warning (0, "%Jparameter %u has void type",
4836 if (DECL_NAME (parm) && TREE_USED (parm))
4837 warn_if_shadowing (parm);
4843 /* Take apart the current scope and return a c_arg_info structure with
4844 info on a parameter list just parsed.
4846 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4848 ELLIPSIS being true means the argument list ended in '...' so don't
4849 append a sentinel (void_list_node) to the end of the type-list. */
4852 get_parm_info (bool ellipsis)
4854 struct c_binding *b = current_scope->bindings;
4855 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4862 static bool explained_incomplete_types = false;
4863 bool gave_void_only_once_err = false;
4865 arg_info->parms = 0;
4867 arg_info->types = 0;
4868 arg_info->others = 0;
4870 /* The bindings in this scope must not get put into a block.
4871 We will take care of deleting the binding nodes. */
4872 current_scope->bindings = 0;
4874 /* This function is only called if there was *something* on the
4878 /* A parameter list consisting solely of 'void' indicates that the
4879 function takes no arguments. But if the 'void' is qualified
4880 (by 'const' or 'volatile'), or has a storage class specifier
4881 ('register'), then the behavior is undefined; issue an error.
4882 Typedefs for 'void' are OK (see DR#157). */
4883 if (b->prev == 0 /* one binding */
4884 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4885 && !DECL_NAME (b->decl) /* anonymous */
4886 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4888 if (TREE_THIS_VOLATILE (b->decl)
4889 || TREE_READONLY (b->decl)
4890 || C_DECL_REGISTER (b->decl))
4891 error ("%<void%> as only parameter may not be qualified");
4893 /* There cannot be an ellipsis. */
4895 error ("%<void%> must be the only parameter");
4897 arg_info->types = void_list_node;
4902 types = void_list_node;
4904 /* Break up the bindings list into parms, tags, types, and others;
4905 apply sanity checks; purge the name-to-decl bindings. */
4908 tree decl = b->decl;
4909 tree type = TREE_TYPE (decl);
4910 const char *keyword;
4912 switch (TREE_CODE (decl))
4917 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4918 I_SYMBOL_BINDING (b->id) = b->shadowed;
4921 /* Check for forward decls that never got their actual decl. */
4922 if (TREE_ASM_WRITTEN (decl))
4923 error ("parameter %q+D has just a forward declaration", decl);
4924 /* Check for (..., void, ...) and issue an error. */
4925 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4927 if (!gave_void_only_once_err)
4929 error ("%<void%> must be the only parameter");
4930 gave_void_only_once_err = true;
4935 /* Valid parameter, add it to the list. */
4936 TREE_CHAIN (decl) = parms;
4939 /* Since there is a prototype, args are passed in their
4940 declared types. The back end may override this later. */
4941 DECL_ARG_TYPE (decl) = type;
4942 types = tree_cons (0, type, types);
4946 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4947 case UNION_TYPE: keyword = "union"; goto tag;
4948 case RECORD_TYPE: keyword = "struct"; goto tag;
4950 /* Types may not have tag-names, in which case the type
4951 appears in the bindings list with b->id NULL. */
4954 gcc_assert (I_TAG_BINDING (b->id) == b);
4955 I_TAG_BINDING (b->id) = b->shadowed;
4958 /* Warn about any struct, union or enum tags defined in a
4959 parameter list. The scope of such types is limited to
4960 the parameter list, which is rarely if ever desirable
4961 (it's impossible to call such a function with type-
4962 correct arguments). An anonymous union parm type is
4963 meaningful as a GNU extension, so don't warn for that. */
4964 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4967 /* The %s will be one of 'struct', 'union', or 'enum'. */
4968 warning (0, "%<%s %E%> declared inside parameter list",
4971 /* The %s will be one of 'struct', 'union', or 'enum'. */
4972 warning (0, "anonymous %s declared inside parameter list",
4975 if (!explained_incomplete_types)
4977 warning (0, "its scope is only this definition or declaration,"
4978 " which is probably not what you want");
4979 explained_incomplete_types = true;
4983 tags = tree_cons (b->id, decl, tags);
4989 /* CONST_DECLs appear here when we have an embedded enum,
4990 and TYPE_DECLs appear here when we have an embedded struct
4991 or union. No warnings for this - we already warned about the
4992 type itself. FUNCTION_DECLs appear when there is an implicit
4993 function declaration in the parameter list. */
4995 TREE_CHAIN (decl) = others;
5000 /* error_mark_node appears here when we have an undeclared
5001 variable. Just throw it away. */
5004 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5005 I_SYMBOL_BINDING (b->id) = b->shadowed;
5009 /* Other things that might be encountered. */
5016 b = free_binding_and_advance (b);
5019 arg_info->parms = parms;
5020 arg_info->tags = tags;
5021 arg_info->types = types;
5022 arg_info->others = others;
5026 /* Get the struct, enum or union (CODE says which) with tag NAME.
5027 Define the tag as a forward-reference if it is not defined.
5028 Return a c_typespec structure for the type specifier. */
5031 parser_xref_tag (enum tree_code code, tree name)
5033 struct c_typespec ret;
5034 /* If a cross reference is requested, look up the type
5035 already defined for this tag and return it. */
5037 tree ref = lookup_tag (code, name, 0);
5038 /* If this is the right type of tag, return what we found.
5039 (This reference will be shadowed by shadow_tag later if appropriate.)
5040 If this is the wrong type of tag, do not return it. If it was the
5041 wrong type in the same scope, we will have had an error
5042 message already; if in a different scope and declaring
5043 a name, pending_xref_error will give an error message; but if in a
5044 different scope and not declaring a name, this tag should
5045 shadow the previous declaration of a different type of tag, and
5046 this would not work properly if we return the reference found.
5047 (For example, with "struct foo" in an outer scope, "union foo;"
5048 must shadow that tag with a new one of union type.) */
5049 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5050 if (ref && TREE_CODE (ref) == code)
5056 /* If no such tag is yet defined, create a forward-reference node
5057 and record it as the "definition".
5058 When a real declaration of this type is found,
5059 the forward-reference will be altered into a real type. */
5061 ref = make_node (code);
5062 if (code == ENUMERAL_TYPE)
5064 /* Give the type a default layout like unsigned int
5065 to avoid crashing if it does not get defined. */
5066 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5067 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5068 TYPE_USER_ALIGN (ref) = 0;
5069 TYPE_UNSIGNED (ref) = 1;
5070 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5071 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5072 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5075 pushtag (name, ref);
5081 /* Get the struct, enum or union (CODE says which) with tag NAME.
5082 Define the tag as a forward-reference if it is not defined.
5083 Return a tree for the type. */
5086 xref_tag (enum tree_code code, tree name)
5088 return parser_xref_tag (code, name).spec;
5091 /* Make sure that the tag NAME is defined *in the current scope*
5092 at least as a forward reference.
5093 CODE says which kind of tag NAME ought to be. */
5096 start_struct (enum tree_code code, tree name)
5098 /* If there is already a tag defined at this scope
5099 (as a forward reference), just return it. */
5104 ref = lookup_tag (code, name, 1);
5105 if (ref && TREE_CODE (ref) == code)
5107 if (TYPE_SIZE (ref))
5109 if (code == UNION_TYPE)
5110 error ("redefinition of %<union %E%>", name);
5112 error ("redefinition of %<struct %E%>", name);
5114 else if (C_TYPE_BEING_DEFINED (ref))
5116 if (code == UNION_TYPE)
5117 error ("nested redefinition of %<union %E%>", name);
5119 error ("nested redefinition of %<struct %E%>", name);
5124 /* Otherwise create a forward-reference just so the tag is in scope. */
5126 ref = make_node (code);
5127 pushtag (name, ref);
5130 C_TYPE_BEING_DEFINED (ref) = 1;
5131 TYPE_PACKED (ref) = flag_pack_struct;
5135 /* Process the specs, declarator and width (NULL if omitted)
5136 of a structure component, returning a FIELD_DECL node.
5137 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5139 This is done during the parsing of the struct declaration.
5140 The FIELD_DECL nodes are chained together and the lot of them
5141 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5144 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5149 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5150 && width == NULL_TREE)
5152 /* This is an unnamed decl.
5154 If we have something of the form "union { list } ;" then this
5155 is the anonymous union extension. Similarly for struct.
5157 If this is something of the form "struct foo;", then
5158 If MS extensions are enabled, this is handled as an
5160 Otherwise this is a forward declaration of a structure tag.
5162 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5163 If MS extensions are enabled and foo names a structure, then
5164 again this is an anonymous struct.
5165 Otherwise this is an error.
5167 Oh what a horrid tangled web we weave. I wonder if MS consciously
5168 took this from Plan 9 or if it was an accident of implementation
5169 that took root before someone noticed the bug... */
5171 tree type = declspecs->type;
5172 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5173 || TREE_CODE (type) == UNION_TYPE);
5177 && (flag_ms_extensions || !declspecs->typedef_p))
5179 if (flag_ms_extensions)
5183 else if (TYPE_NAME (type) == NULL)
5190 pedwarn ("declaration does not declare anything");
5194 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5197 value = grokdeclarator (declarator, declspecs, FIELD, false,
5198 width ? &width : NULL);
5200 finish_decl (value, NULL_TREE, NULL_TREE);
5201 DECL_INITIAL (value) = width;
5206 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5207 the list such that this does not present a problem later. */
5210 detect_field_duplicates (tree fieldlist)
5215 /* First, see if there are more than "a few" fields.
5216 This is trivially true if there are zero or one fields. */
5219 x = TREE_CHAIN (fieldlist);
5225 } while (timeout > 0 && x);
5227 /* If there were "few" fields, avoid the overhead of allocating
5228 a hash table. Instead just do the nested traversal thing. */
5231 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5234 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5235 if (DECL_NAME (y) == DECL_NAME (x))
5237 error ("duplicate member %q+D", x);
5238 DECL_NAME (x) = NULL_TREE;
5244 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5247 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5248 if ((y = DECL_NAME (x)) != 0)
5250 slot = htab_find_slot (htab, y, INSERT);
5253 error ("duplicate member %q+D", x);
5254 DECL_NAME (x) = NULL_TREE;
5263 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5264 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5265 ATTRIBUTES are attributes to be applied to the structure. */
5268 finish_struct (tree t, tree fieldlist, tree attributes)
5271 bool toplevel = file_scope == current_scope;
5272 int saw_named_field;
5274 /* If this type was previously laid out as a forward reference,
5275 make sure we lay it out again. */
5279 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5283 for (x = fieldlist; x; x = TREE_CHAIN (x))
5284 if (DECL_NAME (x) != 0)
5289 if (TREE_CODE (t) == UNION_TYPE)
5292 pedwarn ("union has no named members");
5294 pedwarn ("union has no members");
5299 pedwarn ("struct has no named members");
5301 pedwarn ("struct has no members");
5306 /* Install struct as DECL_CONTEXT of each field decl.
5307 Also process specified field sizes, found in the DECL_INITIAL,
5308 storing 0 there after the type has been changed to precision equal
5309 to its width, rather than the precision of the specified standard
5310 type. (Correct layout requires the original type to have been preserved
5313 saw_named_field = 0;
5314 for (x = fieldlist; x; x = TREE_CHAIN (x))
5316 DECL_CONTEXT (x) = t;
5317 DECL_PACKED (x) |= TYPE_PACKED (t);
5319 /* If any field is const, the structure type is pseudo-const. */
5320 if (TREE_READONLY (x))
5321 C_TYPE_FIELDS_READONLY (t) = 1;
5324 /* A field that is pseudo-const makes the structure likewise. */
5325 tree t1 = TREE_TYPE (x);
5326 while (TREE_CODE (t1) == ARRAY_TYPE)
5327 t1 = TREE_TYPE (t1);
5328 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5329 && C_TYPE_FIELDS_READONLY (t1))
5330 C_TYPE_FIELDS_READONLY (t) = 1;
5333 /* Any field that is volatile means variables of this type must be
5334 treated in some ways as volatile. */
5335 if (TREE_THIS_VOLATILE (x))
5336 C_TYPE_FIELDS_VOLATILE (t) = 1;
5338 /* Any field of nominal variable size implies structure is too. */
5339 if (C_DECL_VARIABLE_SIZE (x))
5340 C_TYPE_VARIABLE_SIZE (t) = 1;
5342 if (DECL_INITIAL (x))
5344 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5345 DECL_SIZE (x) = bitsize_int (width);
5346 DECL_BIT_FIELD (x) = 1;
5347 SET_DECL_C_BIT_FIELD (x);
5350 /* Detect flexible array member in an invalid context. */
5351 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5352 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5353 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5354 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5356 if (TREE_CODE (t) == UNION_TYPE)
5358 error ("%Jflexible array member in union", x);
5359 TREE_TYPE (x) = error_mark_node;
5361 else if (TREE_CHAIN (x) != NULL_TREE)
5363 error ("%Jflexible array member not at end of struct", x);
5364 TREE_TYPE (x) = error_mark_node;
5366 else if (!saw_named_field)
5368 error ("%Jflexible array member in otherwise empty struct", x);
5369 TREE_TYPE (x) = error_mark_node;
5373 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5374 && flexible_array_type_p (TREE_TYPE (x)))
5375 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5378 saw_named_field = 1;
5381 detect_field_duplicates (fieldlist);
5383 /* Now we have the nearly final fieldlist. Record it,
5384 then lay out the structure or union (including the fields). */
5386 TYPE_FIELDS (t) = fieldlist;
5390 /* Give bit-fields their proper types. */
5392 tree *fieldlistp = &fieldlist;
5394 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5395 && TREE_TYPE (*fieldlistp) != error_mark_node)
5397 unsigned HOST_WIDE_INT width
5398 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5399 tree type = TREE_TYPE (*fieldlistp);
5400 if (width != TYPE_PRECISION (type))
5402 TREE_TYPE (*fieldlistp)
5403 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5404 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5406 DECL_INITIAL (*fieldlistp) = 0;
5409 fieldlistp = &TREE_CHAIN (*fieldlistp);
5412 /* Now we have the truly final field list.
5413 Store it in this type and in the variants. */
5415 TYPE_FIELDS (t) = fieldlist;
5417 /* If there are lots of fields, sort so we can look through them fast.
5418 We arbitrarily consider 16 or more elts to be "a lot". */
5423 for (x = fieldlist; x; x = TREE_CHAIN (x))
5425 if (len > 15 || DECL_NAME (x) == NULL)
5433 struct lang_type *space;
5434 struct sorted_fields_type *space2;
5436 len += list_length (x);
5438 /* Use the same allocation policy here that make_node uses, to
5439 ensure that this lives as long as the rest of the struct decl.
5440 All decls in an inline function need to be saved. */
5442 space = GGC_CNEW (struct lang_type);
5443 space2 = GGC_NEWVAR (struct sorted_fields_type,
5444 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5448 field_array = &space2->elts[0];
5449 for (x = fieldlist; x; x = TREE_CHAIN (x))
5451 field_array[len++] = x;
5453 /* If there is anonymous struct or union, break out of the loop. */
5454 if (DECL_NAME (x) == NULL)
5457 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5460 TYPE_LANG_SPECIFIC (t) = space;
5461 TYPE_LANG_SPECIFIC (t)->s->len = len;
5462 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5463 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5468 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5470 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5471 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5472 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5473 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5474 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5475 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5476 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5479 /* If this was supposed to be a transparent union, but we can't
5480 make it one, warn and turn off the flag. */
5481 if (TREE_CODE (t) == UNION_TYPE
5482 && TYPE_TRANSPARENT_UNION (t)
5483 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5485 TYPE_TRANSPARENT_UNION (t) = 0;
5486 warning (0, "union cannot be made transparent");
5489 /* If this structure or union completes the type of any previous
5490 variable declaration, lay it out and output its rtl. */
5491 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5495 tree decl = TREE_VALUE (x);
5496 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5497 layout_array_type (TREE_TYPE (decl));
5498 if (TREE_CODE (decl) != TYPE_DECL)
5500 layout_decl (decl, 0);
5501 if (c_dialect_objc ())
5502 objc_check_decl (decl);
5503 rest_of_decl_compilation (decl, toplevel, 0);
5508 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5510 /* Finish debugging output for this type. */
5511 rest_of_type_compilation (t, toplevel);
5513 /* If we're inside a function proper, i.e. not file-scope and not still
5514 parsing parameters, then arrange for the size of a variable sized type
5516 if (cur_stmt_list && variably_modified_type_p (t, NULL))
5517 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5522 /* Lay out the type T, and its element type, and so on. */
5525 layout_array_type (tree t)
5527 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5528 layout_array_type (TREE_TYPE (t));
5532 /* Begin compiling the definition of an enumeration type.
5533 NAME is its name (or null if anonymous).
5534 Returns the type object, as yet incomplete.
5535 Also records info about it so that build_enumerator
5536 may be used to declare the individual values as they are read. */
5539 start_enum (tree name)
5543 /* If this is the real definition for a previous forward reference,
5544 fill in the contents in the same object that used to be the
5545 forward reference. */
5548 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5550 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5552 enumtype = make_node (ENUMERAL_TYPE);
5553 pushtag (name, enumtype);
5556 if (C_TYPE_BEING_DEFINED (enumtype))
5557 error ("nested redefinition of %<enum %E%>", name);
5559 C_TYPE_BEING_DEFINED (enumtype) = 1;
5561 if (TYPE_VALUES (enumtype) != 0)
5563 /* This enum is a named one that has been declared already. */
5564 error ("redeclaration of %<enum %E%>", name);
5566 /* Completely replace its old definition.
5567 The old enumerators remain defined, however. */
5568 TYPE_VALUES (enumtype) = 0;
5571 enum_next_value = integer_zero_node;
5574 if (flag_short_enums)
5575 TYPE_PACKED (enumtype) = 1;
5580 /* After processing and defining all the values of an enumeration type,
5581 install their decls in the enumeration type and finish it off.
5582 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5583 and ATTRIBUTES are the specified attributes.
5584 Returns ENUMTYPE. */
5587 finish_enum (tree enumtype, tree values, tree attributes)
5590 tree minnode = 0, maxnode = 0;
5591 int precision, unsign;
5592 bool toplevel = (file_scope == current_scope);
5593 struct lang_type *lt;
5595 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5597 /* Calculate the maximum value of any enumerator in this type. */
5599 if (values == error_mark_node)
5600 minnode = maxnode = integer_zero_node;
5603 minnode = maxnode = TREE_VALUE (values);
5604 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5606 tree value = TREE_VALUE (pair);
5607 if (tree_int_cst_lt (maxnode, value))
5609 if (tree_int_cst_lt (value, minnode))
5614 /* Construct the final type of this enumeration. It is the same
5615 as one of the integral types - the narrowest one that fits, except
5616 that normally we only go as narrow as int - and signed iff any of
5617 the values are negative. */
5618 unsign = (tree_int_cst_sgn (minnode) >= 0);
5619 precision = MAX (min_precision (minnode, unsign),
5620 min_precision (maxnode, unsign));
5622 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5624 tem = c_common_type_for_size (precision, unsign);
5627 warning (0, "enumeration values exceed range of largest integer");
5628 tem = long_long_integer_type_node;
5632 tem = unsign ? unsigned_type_node : integer_type_node;
5634 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5635 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5636 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5637 TYPE_SIZE (enumtype) = 0;
5639 /* If the precision of the type was specific with an attribute and it
5640 was too small, give an error. Otherwise, use it. */
5641 if (TYPE_PRECISION (enumtype))
5643 if (precision > TYPE_PRECISION (enumtype))
5644 error ("specified mode too small for enumeral values");
5647 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5649 layout_type (enumtype);
5651 if (values != error_mark_node)
5653 /* Change the type of the enumerators to be the enum type. We
5654 need to do this irrespective of the size of the enum, for
5655 proper type checking. Replace the DECL_INITIALs of the
5656 enumerators, and the value slots of the list, with copies
5657 that have the enum type; they cannot be modified in place
5658 because they may be shared (e.g. integer_zero_node) Finally,
5659 change the purpose slots to point to the names of the decls. */
5660 for (pair = values; pair; pair = TREE_CHAIN (pair))
5662 tree enu = TREE_PURPOSE (pair);
5663 tree ini = DECL_INITIAL (enu);
5665 TREE_TYPE (enu) = enumtype;
5667 /* The ISO C Standard mandates enumerators to have type int,
5668 even though the underlying type of an enum type is
5669 unspecified. Here we convert any enumerators that fit in
5670 an int to type int, to avoid promotions to unsigned types
5671 when comparing integers with enumerators that fit in the
5672 int range. When -pedantic is given, build_enumerator()
5673 would have already taken care of those that don't fit. */
5674 if (int_fits_type_p (ini, integer_type_node))
5675 tem = integer_type_node;
5678 ini = convert (tem, ini);
5680 DECL_INITIAL (enu) = ini;
5681 TREE_PURPOSE (pair) = DECL_NAME (enu);
5682 TREE_VALUE (pair) = ini;
5685 TYPE_VALUES (enumtype) = values;
5688 /* Record the min/max values so that we can warn about bit-field
5689 enumerations that are too small for the values. */
5690 lt = GGC_CNEW (struct lang_type);
5691 lt->enum_min = minnode;
5692 lt->enum_max = maxnode;
5693 TYPE_LANG_SPECIFIC (enumtype) = lt;
5695 /* Fix up all variant types of this enum type. */
5696 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5698 if (tem == enumtype)
5700 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5701 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5702 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5703 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5704 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5705 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5706 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5707 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5708 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5709 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5710 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5713 /* Finish debugging output for this type. */
5714 rest_of_type_compilation (enumtype, toplevel);
5719 /* Build and install a CONST_DECL for one value of the
5720 current enumeration type (one that was begun with start_enum).
5721 Return a tree-list containing the CONST_DECL and its value.
5722 Assignment of sequential values by default is handled here. */
5725 build_enumerator (tree name, tree value)
5729 /* Validate and default VALUE. */
5733 /* Don't issue more errors for error_mark_node (i.e. an
5734 undeclared identifier) - just ignore the value expression. */
5735 if (value == error_mark_node)
5737 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5738 || TREE_CODE (value) != INTEGER_CST)
5740 error ("enumerator value for %qE is not an integer constant", name);
5745 value = default_conversion (value);
5746 constant_expression_warning (value);
5750 /* Default based on previous value. */
5751 /* It should no longer be possible to have NON_LVALUE_EXPR
5755 value = enum_next_value;
5757 error ("overflow in enumeration values");
5760 if (pedantic && !int_fits_type_p (value, integer_type_node))
5762 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5763 /* XXX This causes -pedantic to change the meaning of the program.
5764 Remove? -zw 2004-03-15 */
5765 value = convert (integer_type_node, value);
5768 /* Set basis for default for next value. */
5769 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5770 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5772 /* Now create a declaration for the enum value name. */
5774 type = TREE_TYPE (value);
5775 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5776 TYPE_PRECISION (integer_type_node)),
5777 (TYPE_PRECISION (type)
5778 >= TYPE_PRECISION (integer_type_node)
5779 && TYPE_UNSIGNED (type)));
5781 decl = build_decl (CONST_DECL, name, type);
5782 DECL_INITIAL (decl) = convert (type, value);
5785 return tree_cons (decl, value, NULL_TREE);
5789 /* Create the FUNCTION_DECL for a function definition.
5790 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5791 the declaration; they describe the function's name and the type it returns,
5792 but twisted together in a fashion that parallels the syntax of C.
5794 This function creates a binding context for the function body
5795 as well as setting up the FUNCTION_DECL in current_function_decl.
5797 Returns 1 on success. If the DECLARATOR is not suitable for a function
5798 (it defines a datum instead), we return 0, which tells
5799 yyparse to report a parse error. */
5802 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5805 tree decl1, old_decl;
5806 tree restype, resdecl;
5807 struct c_label_context_se *nstack_se;
5808 struct c_label_context_vm *nstack_vm;
5810 current_function_returns_value = 0; /* Assume, until we see it does. */
5811 current_function_returns_null = 0;
5812 current_function_returns_abnormally = 0;
5813 warn_about_return_type = 0;
5814 current_extern_inline = 0;
5815 c_switch_stack = NULL;
5817 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
5818 nstack_se->labels_def = NULL;
5819 nstack_se->labels_used = NULL;
5820 nstack_se->next = label_context_stack_se;
5821 label_context_stack_se = nstack_se;
5823 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
5824 nstack_vm->labels_def = NULL;
5825 nstack_vm->labels_used = NULL;
5826 nstack_vm->scope = 0;
5827 nstack_vm->next = label_context_stack_vm;
5828 label_context_stack_vm = nstack_vm;
5830 /* Indicate no valid break/continue context by setting these variables
5831 to some non-null, non-label value. We'll notice and emit the proper
5832 error message in c_finish_bc_stmt. */
5833 c_break_label = c_cont_label = size_zero_node;
5835 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5837 /* If the declarator is not suitable for a function definition,
5838 cause a syntax error. */
5841 label_context_stack_se = label_context_stack_se->next;
5842 label_context_stack_vm = label_context_stack_vm->next;
5846 decl_attributes (&decl1, attributes, 0);
5848 if (DECL_DECLARED_INLINE_P (decl1)
5849 && DECL_UNINLINABLE (decl1)
5850 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5851 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
5854 announce_function (decl1);
5856 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5858 error ("return type is an incomplete type");
5859 /* Make it return void instead. */
5861 = build_function_type (void_type_node,
5862 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5865 if (warn_about_return_type)
5866 pedwarn_c99 ("return type defaults to %<int%>");
5868 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5869 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5870 DECL_INITIAL (decl1) = error_mark_node;
5872 /* If this definition isn't a prototype and we had a prototype declaration
5873 before, copy the arg type info from that prototype. */
5874 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5875 current_function_prototype_locus = UNKNOWN_LOCATION;
5876 current_function_prototype_built_in = false;
5877 current_function_prototype_arg_types = NULL_TREE;
5878 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5880 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5881 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5882 TREE_TYPE (TREE_TYPE (old_decl))))
5884 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5886 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5887 current_function_prototype_built_in
5888 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
5889 current_function_prototype_arg_types
5890 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
5892 if (TREE_PUBLIC (decl1))
5894 /* If there is an external prototype declaration of this
5895 function, record its location but do not copy information
5896 to this decl. This may be an invisible declaration
5897 (built-in or in a scope which has finished) or simply
5898 have more refined argument types than any declaration
5900 struct c_binding *b;
5901 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
5902 if (B_IN_SCOPE (b, external_scope))
5906 tree ext_decl, ext_type;
5908 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
5909 if (TREE_CODE (ext_type) == FUNCTION_TYPE
5910 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5911 TREE_TYPE (ext_type)))
5913 current_function_prototype_locus
5914 = DECL_SOURCE_LOCATION (ext_decl);
5915 current_function_prototype_built_in
5916 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
5917 current_function_prototype_arg_types
5918 = TYPE_ARG_TYPES (ext_type);
5924 /* Optionally warn of old-fashioned def with no previous prototype. */
5925 if (warn_strict_prototypes
5926 && old_decl != error_mark_node
5927 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5928 && C_DECL_ISNT_PROTOTYPE (old_decl))
5929 warning (OPT_Wstrict_prototypes,
5930 "function declaration isn%'t a prototype");
5931 /* Optionally warn of any global def with no previous prototype. */
5932 else if (warn_missing_prototypes
5933 && old_decl != error_mark_node
5934 && TREE_PUBLIC (decl1)
5935 && !MAIN_NAME_P (DECL_NAME (decl1))
5936 && C_DECL_ISNT_PROTOTYPE (old_decl))
5937 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
5938 /* Optionally warn of any def with no previous prototype
5939 if the function has already been used. */
5940 else if (warn_missing_prototypes
5942 && old_decl != error_mark_node
5943 && TREE_USED (old_decl)
5944 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5945 warning (OPT_Wmissing_prototypes,
5946 "%q+D was used with no prototype before its definition", decl1);
5947 /* Optionally warn of any global def with no previous declaration. */
5948 else if (warn_missing_declarations
5949 && TREE_PUBLIC (decl1)
5951 && !MAIN_NAME_P (DECL_NAME (decl1)))
5952 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
5954 /* Optionally warn of any def with no previous declaration
5955 if the function has already been used. */
5956 else if (warn_missing_declarations
5958 && old_decl != error_mark_node
5959 && TREE_USED (old_decl)
5960 && C_DECL_IMPLICIT (old_decl))
5961 warning (OPT_Wmissing_declarations,
5962 "%q+D was used with no declaration before its definition", decl1);
5964 /* This is a definition, not a reference.
5965 So normally clear DECL_EXTERNAL.
5966 However, `extern inline' acts like a declaration
5967 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5968 DECL_EXTERNAL (decl1) = current_extern_inline;
5970 /* This function exists in static storage.
5971 (This does not mean `static' in the C sense!) */
5972 TREE_STATIC (decl1) = 1;
5974 /* A nested function is not global. */
5975 if (current_function_decl != 0)
5976 TREE_PUBLIC (decl1) = 0;
5978 /* This is the earliest point at which we might know the assembler
5979 name of the function. Thus, if it's set before this, die horribly. */
5980 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5982 /* If #pragma weak was used, mark the decl weak now. */
5983 if (current_scope == file_scope)
5984 maybe_apply_pragma_weak (decl1);
5986 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5987 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5992 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5993 != integer_type_node)
5994 pedwarn ("return type of %q+D is not %<int%>", decl1);
5996 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5997 args = TREE_CHAIN (args))
5999 tree type = args ? TREE_VALUE (args) : 0;
6001 if (type == void_type_node)
6008 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6009 pedwarn ("first argument of %q+D should be %<int%>", decl1);
6013 if (TREE_CODE (type) != POINTER_TYPE
6014 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6015 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6017 pedwarn ("second argument of %q+D should be %<char **%>",
6022 if (TREE_CODE (type) != POINTER_TYPE
6023 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6024 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6026 pedwarn ("third argument of %q+D should probably be "
6027 "%<char **%>", decl1);
6032 /* It is intentional that this message does not mention the third
6033 argument because it's only mentioned in an appendix of the
6035 if (argct > 0 && (argct < 2 || argct > 3))
6036 pedwarn ("%q+D takes only zero or two arguments", decl1);
6038 if (!TREE_PUBLIC (decl1))
6039 pedwarn ("%q+D is normally a non-static function", decl1);
6042 /* Record the decl so that the function name is defined.
6043 If we already have a decl for this name, and it is a FUNCTION_DECL,
6044 use the old decl. */
6046 current_function_decl = pushdecl (decl1);
6049 declare_parm_level ();
6051 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6052 /* Promote the value to int before returning it. */
6053 if (c_promoting_integer_type_p (restype))
6055 /* It retains unsignedness if not really getting wider. */
6056 if (TYPE_UNSIGNED (restype)
6057 && (TYPE_PRECISION (restype)
6058 == TYPE_PRECISION (integer_type_node)))
6059 restype = unsigned_type_node;
6061 restype = integer_type_node;
6064 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6065 DECL_ARTIFICIAL (resdecl) = 1;
6066 DECL_IGNORED_P (resdecl) = 1;
6067 DECL_RESULT (current_function_decl) = resdecl;
6069 start_fname_decls ();
6074 /* Subroutine of store_parm_decls which handles new-style function
6075 definitions (prototype format). The parms already have decls, so we
6076 need only record them as in effect and complain if any redundant
6077 old-style parm decls were written. */
6079 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6083 if (current_scope->bindings)
6085 error ("%Jold-style parameter declarations in prototyped "
6086 "function definition", fndecl);
6088 /* Get rid of the old-style declarations. */
6092 /* Don't issue this warning for nested functions, and don't issue this
6093 warning if we got here because ARG_INFO_TYPES was error_mark_node
6094 (this happens when a function definition has just an ellipsis in
6095 its parameter list). */
6096 else if (!in_system_header && !current_function_scope
6097 && arg_info->types != error_mark_node)
6098 warning (OPT_Wtraditional,
6099 "%Jtraditional C rejects ISO C style function definitions",
6102 /* Now make all the parameter declarations visible in the function body.
6103 We can bypass most of the grunt work of pushdecl. */
6104 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6106 DECL_CONTEXT (decl) = current_function_decl;
6107 if (DECL_NAME (decl))
6109 bind (DECL_NAME (decl), decl, current_scope,
6110 /*invisible=*/false, /*nested=*/false);
6111 if (!TREE_USED (decl))
6112 warn_if_shadowing (decl);
6115 error ("%Jparameter name omitted", decl);
6118 /* Record the parameter list in the function declaration. */
6119 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6121 /* Now make all the ancillary declarations visible, likewise. */
6122 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6124 DECL_CONTEXT (decl) = current_function_decl;
6125 if (DECL_NAME (decl))
6126 bind (DECL_NAME (decl), decl, current_scope,
6127 /*invisible=*/false, /*nested=*/false);
6130 /* And all the tag declarations. */
6131 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6132 if (TREE_PURPOSE (decl))
6133 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6134 /*invisible=*/false, /*nested=*/false);
6137 /* Subroutine of store_parm_decls which handles old-style function
6138 definitions (separate parameter list and declarations). */
6141 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6143 struct c_binding *b;
6144 tree parm, decl, last;
6145 tree parmids = arg_info->parms;
6146 struct pointer_set_t *seen_args = pointer_set_create ();
6148 if (!in_system_header)
6149 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6152 /* Match each formal parameter name with its declaration. Save each
6153 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6154 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6156 if (TREE_VALUE (parm) == 0)
6158 error ("%Jparameter name missing from parameter list", fndecl);
6159 TREE_PURPOSE (parm) = 0;
6163 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6164 if (b && B_IN_CURRENT_SCOPE (b))
6167 /* If we got something other than a PARM_DECL it is an error. */
6168 if (TREE_CODE (decl) != PARM_DECL)
6169 error ("%q+D declared as a non-parameter", decl);
6170 /* If the declaration is already marked, we have a duplicate
6171 name. Complain and ignore the duplicate. */
6172 else if (pointer_set_contains (seen_args, decl))
6174 error ("multiple parameters named %q+D", decl);
6175 TREE_PURPOSE (parm) = 0;
6178 /* If the declaration says "void", complain and turn it into
6180 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6182 error ("parameter %q+D declared with void type", decl);
6183 TREE_TYPE (decl) = integer_type_node;
6184 DECL_ARG_TYPE (decl) = integer_type_node;
6185 layout_decl (decl, 0);
6187 warn_if_shadowing (decl);
6189 /* If no declaration found, default to int. */
6192 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6193 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6194 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6196 warn_if_shadowing (decl);
6199 pedwarn ("type of %q+D defaults to %<int%>", decl);
6200 else if (extra_warnings)
6201 warning (OPT_Wextra, "type of %q+D defaults to %<int%>", decl);
6204 TREE_PURPOSE (parm) = decl;
6205 pointer_set_insert (seen_args, decl);
6208 /* Now examine the parms chain for incomplete declarations
6209 and declarations with no corresponding names. */
6211 for (b = current_scope->bindings; b; b = b->prev)
6214 if (TREE_CODE (parm) != PARM_DECL)
6217 if (TREE_TYPE (parm) != error_mark_node
6218 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6220 error ("parameter %q+D has incomplete type", parm);
6221 TREE_TYPE (parm) = error_mark_node;
6224 if (!pointer_set_contains (seen_args, parm))
6226 error ("declaration for parameter %q+D but no such parameter", parm);
6228 /* Pretend the parameter was not missing.
6229 This gets us to a standard state and minimizes
6230 further error messages. */
6231 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6235 /* Chain the declarations together in the order of the list of
6236 names. Store that chain in the function decl, replacing the
6237 list of names. Update the current scope to match. */
6238 DECL_ARGUMENTS (fndecl) = 0;
6240 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6241 if (TREE_PURPOSE (parm))
6243 if (parm && TREE_PURPOSE (parm))
6245 last = TREE_PURPOSE (parm);
6246 DECL_ARGUMENTS (fndecl) = last;
6248 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6249 if (TREE_PURPOSE (parm))
6251 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6252 last = TREE_PURPOSE (parm);
6254 TREE_CHAIN (last) = 0;
6257 pointer_set_destroy (seen_args);
6259 /* If there was a previous prototype,
6260 set the DECL_ARG_TYPE of each argument according to
6261 the type previously specified, and report any mismatches. */
6263 if (current_function_prototype_arg_types)
6266 for (parm = DECL_ARGUMENTS (fndecl),
6267 type = current_function_prototype_arg_types;
6268 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6269 != void_type_node));
6270 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6272 if (parm == 0 || type == 0
6273 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6275 if (current_function_prototype_built_in)
6276 warning (0, "number of arguments doesn%'t match "
6277 "built-in prototype");
6280 error ("number of arguments doesn%'t match prototype");
6281 error ("%Hprototype declaration",
6282 ¤t_function_prototype_locus);
6286 /* Type for passing arg must be consistent with that
6287 declared for the arg. ISO C says we take the unqualified
6288 type for parameters declared with qualified type. */
6289 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6290 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6292 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6293 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6295 /* Adjust argument to match prototype. E.g. a previous
6296 `int foo(float);' prototype causes
6297 `int foo(x) float x; {...}' to be treated like
6298 `int foo(float x) {...}'. This is particularly
6299 useful for argument types like uid_t. */
6300 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6302 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6303 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6304 && TYPE_PRECISION (TREE_TYPE (parm))
6305 < TYPE_PRECISION (integer_type_node))
6306 DECL_ARG_TYPE (parm) = integer_type_node;
6310 /* ??? Is it possible to get here with a
6311 built-in prototype or will it always have
6312 been diagnosed as conflicting with an
6313 old-style definition and discarded? */
6314 if (current_function_prototype_built_in)
6315 warning (0, "promoted argument %qD "
6316 "doesn%'t match built-in prototype", parm);
6319 pedwarn ("promoted argument %qD "
6320 "doesn%'t match prototype", parm);
6321 pedwarn ("%Hprototype declaration",
6322 ¤t_function_prototype_locus);
6328 if (current_function_prototype_built_in)
6329 warning (0, "argument %qD doesn%'t match "
6330 "built-in prototype", parm);
6333 error ("argument %qD doesn%'t match prototype", parm);
6334 error ("%Hprototype declaration",
6335 ¤t_function_prototype_locus);
6340 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6343 /* Otherwise, create a prototype that would match. */
6347 tree actual = 0, last = 0, type;
6349 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6351 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6353 TREE_CHAIN (last) = type;
6358 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6360 TREE_CHAIN (last) = type;
6364 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6365 of the type of this function, but we need to avoid having this
6366 affect the types of other similarly-typed functions, so we must
6367 first force the generation of an identical (but separate) type
6368 node for the relevant function type. The new node we create
6369 will be a variant of the main variant of the original function
6372 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6374 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6378 /* Store parameter declarations passed in ARG_INFO into the current
6379 function declaration. */
6382 store_parm_decls_from (struct c_arg_info *arg_info)
6384 current_function_arg_info = arg_info;
6385 store_parm_decls ();
6388 /* Store the parameter declarations into the current function declaration.
6389 This is called after parsing the parameter declarations, before
6390 digesting the body of the function.
6392 For an old-style definition, construct a prototype out of the old-style
6393 parameter declarations and inject it into the function's type. */
6396 store_parm_decls (void)
6398 tree fndecl = current_function_decl;
6401 /* The argument information block for FNDECL. */
6402 struct c_arg_info *arg_info = current_function_arg_info;
6403 current_function_arg_info = 0;
6405 /* True if this definition is written with a prototype. Note:
6406 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6407 list in a function definition as equivalent to (void) -- an
6408 empty argument list specifies the function has no parameters,
6409 but only (void) sets up a prototype for future calls. */
6410 proto = arg_info->types != 0;
6413 store_parm_decls_newstyle (fndecl, arg_info);
6415 store_parm_decls_oldstyle (fndecl, arg_info);
6417 /* The next call to push_scope will be a function body. */
6419 next_is_function_body = true;
6421 /* Write a record describing this function definition to the prototypes
6422 file (if requested). */
6424 gen_aux_info_record (fndecl, 1, 0, proto);
6426 /* Initialize the RTL code for the function. */
6427 allocate_struct_function (fndecl);
6429 /* Begin the statement tree for this function. */
6430 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6432 /* ??? Insert the contents of the pending sizes list into the function
6433 to be evaluated. The only reason left to have this is
6434 void foo(int n, int array[n++])
6435 because we throw away the array type in favor of a pointer type, and
6436 thus won't naturally see the SAVE_EXPR containing the increment. All
6437 other pending sizes would be handled by gimplify_parameters. */
6440 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6441 add_stmt (TREE_VALUE (t));
6444 /* Even though we're inside a function body, we still don't want to
6445 call expand_expr to calculate the size of a variable-sized array.
6446 We haven't necessarily assigned RTL to all variables yet, so it's
6447 not safe to try to expand expressions involving them. */
6448 cfun->x_dont_save_pending_sizes_p = 1;
6451 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6455 c_warn_unused_result_recursively (tree fndecl)
6457 struct cgraph_node *cgn;
6459 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6460 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6462 /* Finalize all nested functions now. */
6463 cgn = cgraph_node (fndecl);
6464 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6465 c_warn_unused_result_recursively (cgn->decl);
6468 /* Finish up a function declaration and compile that function
6469 all the way to assembler language output. The free the storage
6470 for the function definition.
6472 This is called after parsing the body of the function definition. */
6475 finish_function (void)
6477 tree fndecl = current_function_decl;
6479 label_context_stack_se = label_context_stack_se->next;
6480 label_context_stack_vm = label_context_stack_vm->next;
6482 if (TREE_CODE (fndecl) == FUNCTION_DECL
6483 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6485 tree args = DECL_ARGUMENTS (fndecl);
6486 for (; args; args = TREE_CHAIN (args))
6488 tree type = TREE_TYPE (args);
6489 if (INTEGRAL_TYPE_P (type)
6490 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6491 DECL_ARG_TYPE (args) = integer_type_node;
6495 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6496 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6498 /* Must mark the RESULT_DECL as being in this function. */
6500 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6501 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6503 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6505 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6506 != integer_type_node)
6508 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6509 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6511 pedwarn ("return type of %q+D is not %<int%>", fndecl);
6517 tree stmt = c_finish_return (integer_zero_node);
6518 #ifdef USE_MAPPED_LOCATION
6519 /* Hack. We don't want the middle-end to warn that this return
6520 is unreachable, so we mark its location as special. Using
6521 UNKNOWN_LOCATION has the problem that it gets clobbered in
6522 annotate_one_with_locus. A cleaner solution might be to
6523 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6525 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6527 /* Hack. We don't want the middle-end to warn that this
6528 return is unreachable, so put the statement on the
6530 annotate_with_file_line (stmt, input_filename, 0);
6536 /* Tie off the statement tree for this function. */
6537 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6539 finish_fname_decls ();
6541 /* Complain if there's just no return statement. */
6542 if (warn_return_type
6543 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6544 && !current_function_returns_value && !current_function_returns_null
6545 /* Don't complain if we are no-return. */
6546 && !current_function_returns_abnormally
6547 /* Don't warn for main(). */
6548 && !MAIN_NAME_P (DECL_NAME (fndecl))
6549 /* Or if they didn't actually specify a return type. */
6550 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6551 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6552 inline function, as we might never be compiled separately. */
6553 && DECL_INLINE (fndecl))
6555 warning (OPT_Wreturn_type,
6556 "no return statement in function returning non-void");
6557 TREE_NO_WARNING (fndecl) = 1;
6560 /* With just -Wextra, complain only if function returns both with
6561 and without a value. */
6563 && current_function_returns_value
6564 && current_function_returns_null)
6565 warning (OPT_Wextra, "this function may return with or without a value");
6567 /* Store the end of the function, so that we get good line number
6568 info for the epilogue. */
6569 cfun->function_end_locus = input_location;
6571 /* If we don't have ctors/dtors sections, and this is a static
6572 constructor or destructor, it must be recorded now. */
6573 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6574 && !targetm.have_ctors_dtors)
6575 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6576 if (DECL_STATIC_DESTRUCTOR (fndecl)
6577 && !targetm.have_ctors_dtors)
6578 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6580 /* Finalize the ELF visibility for the function. */
6581 c_determine_visibility (fndecl);
6583 /* Genericize before inlining. Delay genericizing nested functions
6584 until their parent function is genericized. Since finalizing
6585 requires GENERIC, delay that as well. */
6587 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6588 && !undef_nested_function)
6590 if (!decl_function_context (fndecl))
6592 c_genericize (fndecl);
6593 c_warn_unused_result_recursively (fndecl);
6595 /* ??? Objc emits functions after finalizing the compilation unit.
6596 This should be cleaned up later and this conditional removed. */
6597 if (cgraph_global_info_ready)
6599 c_expand_body (fndecl);
6603 cgraph_finalize_function (fndecl, false);
6607 /* Register this function with cgraph just far enough to get it
6608 added to our parent's nested function list. Handy, since the
6609 C front end doesn't have such a list. */
6610 (void) cgraph_node (fndecl);
6614 if (!decl_function_context (fndecl))
6615 undef_nested_function = false;
6617 /* We're leaving the context of this function, so zap cfun.
6618 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6619 tree_rest_of_compilation. */
6621 current_function_decl = NULL;
6624 /* Generate the RTL for the body of FNDECL. */
6627 c_expand_body (tree fndecl)
6630 if (!DECL_INITIAL (fndecl)
6631 || DECL_INITIAL (fndecl) == error_mark_node)
6634 tree_rest_of_compilation (fndecl);
6636 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6637 && targetm.have_ctors_dtors)
6638 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6639 DEFAULT_INIT_PRIORITY);
6640 if (DECL_STATIC_DESTRUCTOR (fndecl)
6641 && targetm.have_ctors_dtors)
6642 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6643 DEFAULT_INIT_PRIORITY);
6646 /* Check the declarations given in a for-loop for satisfying the C99
6649 check_for_loop_decls (void)
6651 struct c_binding *b;
6655 /* If we get here, declarations have been used in a for loop without
6656 the C99 for loop scope. This doesn't make much sense, so don't
6658 error ("%<for%> loop initial declaration used outside C99 mode");
6661 /* C99 subclause 6.8.5 paragraph 3:
6663 [#3] The declaration part of a for statement shall only
6664 declare identifiers for objects having storage class auto or
6667 It isn't clear whether, in this sentence, "identifiers" binds to
6668 "shall only declare" or to "objects" - that is, whether all identifiers
6669 declared must be identifiers for objects, or whether the restriction
6670 only applies to those that are. (A question on this in comp.std.c
6671 in November 2000 received no answer.) We implement the strictest
6672 interpretation, to avoid creating an extension which later causes
6675 for (b = current_scope->bindings; b; b = b->prev)
6678 tree decl = b->decl;
6683 switch (TREE_CODE (decl))
6686 if (TREE_STATIC (decl))
6687 error ("declaration of static variable %q+D in %<for%> loop "
6688 "initial declaration", decl);
6689 else if (DECL_EXTERNAL (decl))
6690 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6691 "initial declaration", decl);
6695 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6699 error ("%<union %E%> declared in %<for%> loop initial declaration",
6703 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6707 error ("declaration of non-variable %q+D in %<for%> loop "
6708 "initial declaration", decl);
6713 /* Save and reinitialize the variables
6714 used during compilation of a C function. */
6717 c_push_function_context (struct function *f)
6719 struct language_function *p;
6720 p = GGC_NEW (struct language_function);
6723 p->base.x_stmt_tree = c_stmt_tree;
6724 p->x_break_label = c_break_label;
6725 p->x_cont_label = c_cont_label;
6726 p->x_switch_stack = c_switch_stack;
6727 p->arg_info = current_function_arg_info;
6728 p->returns_value = current_function_returns_value;
6729 p->returns_null = current_function_returns_null;
6730 p->returns_abnormally = current_function_returns_abnormally;
6731 p->warn_about_return_type = warn_about_return_type;
6732 p->extern_inline = current_extern_inline;
6735 /* Restore the variables used during compilation of a C function. */
6738 c_pop_function_context (struct function *f)
6740 struct language_function *p = f->language;
6742 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6743 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6745 /* Stop pointing to the local nodes about to be freed. */
6746 /* But DECL_INITIAL must remain nonzero so we know this
6747 was an actual function definition. */
6748 DECL_INITIAL (current_function_decl) = error_mark_node;
6749 DECL_ARGUMENTS (current_function_decl) = 0;
6752 c_stmt_tree = p->base.x_stmt_tree;
6753 c_break_label = p->x_break_label;
6754 c_cont_label = p->x_cont_label;
6755 c_switch_stack = p->x_switch_stack;
6756 current_function_arg_info = p->arg_info;
6757 current_function_returns_value = p->returns_value;
6758 current_function_returns_null = p->returns_null;
6759 current_function_returns_abnormally = p->returns_abnormally;
6760 warn_about_return_type = p->warn_about_return_type;
6761 current_extern_inline = p->extern_inline;
6766 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6769 c_dup_lang_specific_decl (tree decl)
6771 struct lang_decl *ld;
6773 if (!DECL_LANG_SPECIFIC (decl))
6776 ld = GGC_NEW (struct lang_decl);
6777 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6778 DECL_LANG_SPECIFIC (decl) = ld;
6781 /* The functions below are required for functionality of doing
6782 function at once processing in the C front end. Currently these
6783 functions are not called from anywhere in the C front end, but as
6784 these changes continue, that will change. */
6786 /* Returns the stmt_tree (if any) to which statements are currently
6787 being added. If there is no active statement-tree, NULL is
6791 current_stmt_tree (void)
6793 return &c_stmt_tree;
6796 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6800 anon_aggr_type_p (tree ARG_UNUSED (node))
6805 /* Return the global value of T as a symbol. */
6808 identifier_global_value (tree t)
6810 struct c_binding *b;
6812 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6813 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6819 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6820 otherwise the name is found in ridpointers from RID_INDEX. */
6823 record_builtin_type (enum rid rid_index, const char *name, tree type)
6827 id = ridpointers[(int) rid_index];
6829 id = get_identifier (name);
6830 decl = build_decl (TYPE_DECL, id, type);
6832 if (debug_hooks->type_decl)
6833 debug_hooks->type_decl (decl, false);
6836 /* Build the void_list_node (void_type_node having been created). */
6838 build_void_list_node (void)
6840 tree t = build_tree_list (NULL_TREE, void_type_node);
6844 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6847 build_c_parm (struct c_declspecs *specs, tree attrs,
6848 struct c_declarator *declarator)
6850 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6853 ret->declarator = declarator;
6857 /* Return a declarator with nested attributes. TARGET is the inner
6858 declarator to which these attributes apply. ATTRS are the
6861 struct c_declarator *
6862 build_attrs_declarator (tree attrs, struct c_declarator *target)
6864 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6865 ret->kind = cdk_attrs;
6866 ret->declarator = target;
6867 ret->u.attrs = attrs;
6871 /* Return a declarator for a function with arguments specified by ARGS
6872 and return type specified by TARGET. */
6874 struct c_declarator *
6875 build_function_declarator (struct c_arg_info *args,
6876 struct c_declarator *target)
6878 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6879 ret->kind = cdk_function;
6880 ret->declarator = target;
6881 ret->u.arg_info = args;
6885 /* Return a declarator for the identifier IDENT (which may be
6886 NULL_TREE for an abstract declarator). */
6888 struct c_declarator *
6889 build_id_declarator (tree ident)
6891 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6893 ret->declarator = 0;
6895 /* Default value - may get reset to a more precise location. */
6896 ret->id_loc = input_location;
6900 /* Return something to represent absolute declarators containing a *.
6901 TARGET is the absolute declarator that the * contains.
6902 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6903 to apply to the pointer type. */
6905 struct c_declarator *
6906 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6907 struct c_declarator *target)
6911 struct c_declarator *itarget = target;
6912 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6913 if (type_quals_attrs)
6915 attrs = type_quals_attrs->attrs;
6916 quals = quals_from_declspecs (type_quals_attrs);
6917 if (attrs != NULL_TREE)
6918 itarget = build_attrs_declarator (attrs, target);
6920 ret->kind = cdk_pointer;
6921 ret->declarator = itarget;
6922 ret->u.pointer_quals = quals;
6926 /* Return a pointer to a structure for an empty list of declaration
6929 struct c_declspecs *
6930 build_null_declspecs (void)
6932 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6936 ret->typespec_word = cts_none;
6937 ret->storage_class = csc_none;
6938 ret->declspecs_seen_p = false;
6939 ret->type_seen_p = false;
6940 ret->non_sc_seen_p = false;
6941 ret->typedef_p = false;
6942 ret->tag_defined_p = false;
6943 ret->explicit_signed_p = false;
6944 ret->deprecated_p = false;
6945 ret->default_int_p = false;
6946 ret->long_p = false;
6947 ret->long_long_p = false;
6948 ret->short_p = false;
6949 ret->signed_p = false;
6950 ret->unsigned_p = false;
6951 ret->complex_p = false;
6952 ret->inline_p = false;
6953 ret->thread_p = false;
6954 ret->const_p = false;
6955 ret->volatile_p = false;
6956 ret->restrict_p = false;
6960 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6963 struct c_declspecs *
6964 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6968 specs->non_sc_seen_p = true;
6969 specs->declspecs_seen_p = true;
6970 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6971 && C_IS_RESERVED_WORD (qual));
6972 i = C_RID_CODE (qual);
6976 dupe = specs->const_p;
6977 specs->const_p = true;
6980 dupe = specs->volatile_p;
6981 specs->volatile_p = true;
6984 dupe = specs->restrict_p;
6985 specs->restrict_p = true;
6990 if (dupe && pedantic && !flag_isoc99)
6991 pedwarn ("duplicate %qE", qual);
6995 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6998 struct c_declspecs *
6999 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7001 tree type = spec.spec;
7002 specs->non_sc_seen_p = true;
7003 specs->declspecs_seen_p = true;
7004 specs->type_seen_p = true;
7005 if (TREE_DEPRECATED (type))
7006 specs->deprecated_p = true;
7008 /* Handle type specifier keywords. */
7009 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
7011 enum rid i = C_RID_CODE (type);
7014 error ("two or more data types in declaration specifiers");
7017 if ((int) i <= (int) RID_LAST_MODIFIER)
7019 /* "long", "short", "signed", "unsigned" or "_Complex". */
7024 if (specs->long_long_p)
7026 error ("%<long long long%> is too long for GCC");
7031 if (specs->typespec_word == cts_double)
7033 error ("both %<long long%> and %<double%> in "
7034 "declaration specifiers");
7037 if (pedantic && !flag_isoc99 && !in_system_header
7039 pedwarn ("ISO C90 does not support %<long long%>");
7040 specs->long_long_p = 1;
7044 error ("both %<long%> and %<short%> in "
7045 "declaration specifiers");
7046 else if (specs->typespec_word == cts_void)
7047 error ("both %<long%> and %<void%> in "
7048 "declaration specifiers");
7049 else if (specs->typespec_word == cts_bool)
7050 error ("both %<long%> and %<_Bool%> in "
7051 "declaration specifiers");
7052 else if (specs->typespec_word == cts_char)
7053 error ("both %<long%> and %<char%> in "
7054 "declaration specifiers");
7055 else if (specs->typespec_word == cts_float)
7056 error ("both %<long%> and %<float%> in "
7057 "declaration specifiers");
7059 specs->long_p = true;
7062 dupe = specs->short_p;
7064 error ("both %<long%> and %<short%> in "
7065 "declaration specifiers");
7066 else if (specs->typespec_word == cts_void)
7067 error ("both %<short%> and %<void%> in "
7068 "declaration specifiers");
7069 else if (specs->typespec_word == cts_bool)
7070 error ("both %<short%> and %<_Bool%> in "
7071 "declaration specifiers");
7072 else if (specs->typespec_word == cts_char)
7073 error ("both %<short%> and %<char%> in "
7074 "declaration specifiers");
7075 else if (specs->typespec_word == cts_float)
7076 error ("both %<short%> and %<float%> in "
7077 "declaration specifiers");
7078 else if (specs->typespec_word == cts_double)
7079 error ("both %<short%> and %<double%> in "
7080 "declaration specifiers");
7082 specs->short_p = true;
7085 dupe = specs->signed_p;
7086 if (specs->unsigned_p)
7087 error ("both %<signed%> and %<unsigned%> in "
7088 "declaration specifiers");
7089 else if (specs->typespec_word == cts_void)
7090 error ("both %<signed%> and %<void%> in "
7091 "declaration specifiers");
7092 else if (specs->typespec_word == cts_bool)
7093 error ("both %<signed%> and %<_Bool%> in "
7094 "declaration specifiers");
7095 else if (specs->typespec_word == cts_float)
7096 error ("both %<signed%> and %<float%> in "
7097 "declaration specifiers");
7098 else if (specs->typespec_word == cts_double)
7099 error ("both %<signed%> and %<double%> in "
7100 "declaration specifiers");
7102 specs->signed_p = true;
7105 dupe = specs->unsigned_p;
7106 if (specs->signed_p)
7107 error ("both %<signed%> and %<unsigned%> in "
7108 "declaration specifiers");
7109 else if (specs->typespec_word == cts_void)
7110 error ("both %<unsigned%> and %<void%> in "
7111 "declaration specifiers");
7112 else if (specs->typespec_word == cts_bool)
7113 error ("both %<unsigned%> and %<_Bool%> in "
7114 "declaration specifiers");
7115 else if (specs->typespec_word == cts_float)
7116 error ("both %<unsigned%> and %<float%> in "
7117 "declaration specifiers");
7118 else if (specs->typespec_word == cts_double)
7119 error ("both %<unsigned%> and %<double%> in "
7120 "declaration specifiers");
7122 specs->unsigned_p = true;
7125 dupe = specs->complex_p;
7126 if (pedantic && !flag_isoc99 && !in_system_header)
7127 pedwarn ("ISO C90 does not support complex types");
7128 if (specs->typespec_word == cts_void)
7129 error ("both %<complex%> and %<void%> in "
7130 "declaration specifiers");
7131 else if (specs->typespec_word == cts_bool)
7132 error ("both %<complex%> and %<_Bool%> in "
7133 "declaration specifiers");
7135 specs->complex_p = true;
7142 error ("duplicate %qE", type);
7148 /* "void", "_Bool", "char", "int", "float" or "double". */
7149 if (specs->typespec_word != cts_none)
7151 error ("two or more data types in declaration specifiers");
7158 error ("both %<long%> and %<void%> in "
7159 "declaration specifiers");
7160 else if (specs->short_p)
7161 error ("both %<short%> and %<void%> in "
7162 "declaration specifiers");
7163 else if (specs->signed_p)
7164 error ("both %<signed%> and %<void%> in "
7165 "declaration specifiers");
7166 else if (specs->unsigned_p)
7167 error ("both %<unsigned%> and %<void%> in "
7168 "declaration specifiers");
7169 else if (specs->complex_p)
7170 error ("both %<complex%> and %<void%> in "
7171 "declaration specifiers");
7173 specs->typespec_word = cts_void;
7177 error ("both %<long%> and %<_Bool%> in "
7178 "declaration specifiers");
7179 else if (specs->short_p)
7180 error ("both %<short%> and %<_Bool%> in "
7181 "declaration specifiers");
7182 else if (specs->signed_p)
7183 error ("both %<signed%> and %<_Bool%> in "
7184 "declaration specifiers");
7185 else if (specs->unsigned_p)
7186 error ("both %<unsigned%> and %<_Bool%> in "
7187 "declaration specifiers");
7188 else if (specs->complex_p)
7189 error ("both %<complex%> and %<_Bool%> in "
7190 "declaration specifiers");
7192 specs->typespec_word = cts_bool;
7196 error ("both %<long%> and %<char%> in "
7197 "declaration specifiers");
7198 else if (specs->short_p)
7199 error ("both %<short%> and %<char%> in "
7200 "declaration specifiers");
7202 specs->typespec_word = cts_char;
7205 specs->typespec_word = cts_int;
7209 error ("both %<long%> and %<float%> in "
7210 "declaration specifiers");
7211 else if (specs->short_p)
7212 error ("both %<short%> and %<float%> in "
7213 "declaration specifiers");
7214 else if (specs->signed_p)
7215 error ("both %<signed%> and %<float%> in "
7216 "declaration specifiers");
7217 else if (specs->unsigned_p)
7218 error ("both %<unsigned%> and %<float%> in "
7219 "declaration specifiers");
7221 specs->typespec_word = cts_float;
7224 if (specs->long_long_p)
7225 error ("both %<long long%> and %<double%> in "
7226 "declaration specifiers");
7227 else if (specs->short_p)
7228 error ("both %<short%> and %<double%> in "
7229 "declaration specifiers");
7230 else if (specs->signed_p)
7231 error ("both %<signed%> and %<double%> in "
7232 "declaration specifiers");
7233 else if (specs->unsigned_p)
7234 error ("both %<unsigned%> and %<double%> in "
7235 "declaration specifiers");
7237 specs->typespec_word = cts_double;
7240 /* ObjC reserved word "id", handled below. */
7246 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7247 form of ObjC type, cases such as "int" and "long" being handled
7248 above), a TYPE (struct, union, enum and typeof specifiers) or an
7249 ERROR_MARK. In none of these cases may there have previously
7250 been any type specifiers. */
7251 if (specs->type || specs->typespec_word != cts_none
7252 || specs->long_p || specs->short_p || specs->signed_p
7253 || specs->unsigned_p || specs->complex_p)
7254 error ("two or more data types in declaration specifiers");
7255 else if (TREE_CODE (type) == TYPE_DECL)
7257 if (TREE_TYPE (type) == error_mark_node)
7258 ; /* Allow the type to default to int to avoid cascading errors. */
7261 specs->type = TREE_TYPE (type);
7262 specs->decl_attr = DECL_ATTRIBUTES (type);
7263 specs->typedef_p = true;
7264 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7267 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7269 tree t = lookup_name (type);
7270 if (!t || TREE_CODE (t) != TYPE_DECL)
7271 error ("%qE fails to be a typedef or built in type", type);
7272 else if (TREE_TYPE (t) == error_mark_node)
7275 specs->type = TREE_TYPE (t);
7277 else if (TREE_CODE (type) != ERROR_MARK)
7279 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7280 specs->tag_defined_p = true;
7281 if (spec.kind == ctsk_typeof)
7282 specs->typedef_p = true;
7289 /* Add the storage class specifier or function specifier SCSPEC to the
7290 declaration specifiers SPECS, returning SPECS. */
7292 struct c_declspecs *
7293 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7296 enum c_storage_class n = csc_none;
7298 specs->declspecs_seen_p = true;
7299 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7300 && C_IS_RESERVED_WORD (scspec));
7301 i = C_RID_CODE (scspec);
7302 if (extra_warnings && specs->non_sc_seen_p)
7303 warning (OPT_Wextra, "%qE is not at beginning of declaration", scspec);
7307 /* C99 permits duplicate inline. Although of doubtful utility,
7308 it seems simplest to permit it in gnu89 mode as well, as
7309 there is also little utility in maintaining this as a
7310 difference between gnu89 and C99 inline. */
7312 specs->inline_p = true;
7315 dupe = specs->thread_p;
7316 if (specs->storage_class == csc_auto)
7317 error ("%<__thread%> used with %<auto%>");
7318 else if (specs->storage_class == csc_register)
7319 error ("%<__thread%> used with %<register%>");
7320 else if (specs->storage_class == csc_typedef)
7321 error ("%<__thread%> used with %<typedef%>");
7323 specs->thread_p = true;
7330 /* Diagnose "__thread extern". */
7331 if (specs->thread_p)
7332 error ("%<__thread%> before %<extern%>");
7339 /* Diagnose "__thread static". */
7340 if (specs->thread_p)
7341 error ("%<__thread%> before %<static%>");
7349 if (n != csc_none && n == specs->storage_class)
7352 error ("duplicate %qE", scspec);
7355 if (specs->storage_class != csc_none && n != specs->storage_class)
7357 error ("multiple storage classes in declaration specifiers");
7361 specs->storage_class = n;
7362 if (n != csc_extern && n != csc_static && specs->thread_p)
7364 error ("%<__thread%> used with %qE", scspec);
7365 specs->thread_p = false;
7372 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7375 struct c_declspecs *
7376 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7378 specs->attrs = chainon (attrs, specs->attrs);
7379 specs->declspecs_seen_p = true;
7383 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7384 specifiers with any other type specifier to determine the resulting
7385 type. This is where ISO C checks on complex types are made, since
7386 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7389 struct c_declspecs *
7390 finish_declspecs (struct c_declspecs *specs)
7392 /* If a type was specified as a whole, we have no modifiers and are
7394 if (specs->type != NULL_TREE)
7396 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7397 && !specs->signed_p && !specs->unsigned_p
7398 && !specs->complex_p);
7402 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7403 has been specified, treat it as "int" unless "_Complex" is
7404 present and there are no other specifiers. If we just have
7405 "_Complex", it is equivalent to "_Complex double", but e.g.
7406 "_Complex short" is equivalent to "_Complex short int". */
7407 if (specs->typespec_word == cts_none)
7409 if (specs->long_p || specs->short_p
7410 || specs->signed_p || specs->unsigned_p)
7412 specs->typespec_word = cts_int;
7414 else if (specs->complex_p)
7416 specs->typespec_word = cts_double;
7418 pedwarn ("ISO C does not support plain %<complex%> meaning "
7419 "%<double complex%>");
7423 specs->typespec_word = cts_int;
7424 specs->default_int_p = true;
7425 /* We don't diagnose this here because grokdeclarator will
7426 give more specific diagnostics according to whether it is
7427 a function definition. */
7431 /* If "signed" was specified, record this to distinguish "int" and
7432 "signed int" in the case of a bit-field with
7433 -funsigned-bitfields. */
7434 specs->explicit_signed_p = specs->signed_p;
7436 /* Now compute the actual type. */
7437 switch (specs->typespec_word)
7440 gcc_assert (!specs->long_p && !specs->short_p
7441 && !specs->signed_p && !specs->unsigned_p
7442 && !specs->complex_p);
7443 specs->type = void_type_node;
7446 gcc_assert (!specs->long_p && !specs->short_p
7447 && !specs->signed_p && !specs->unsigned_p
7448 && !specs->complex_p);
7449 specs->type = boolean_type_node;
7452 gcc_assert (!specs->long_p && !specs->short_p);
7453 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7454 if (specs->signed_p)
7455 specs->type = signed_char_type_node;
7456 else if (specs->unsigned_p)
7457 specs->type = unsigned_char_type_node;
7459 specs->type = char_type_node;
7460 if (specs->complex_p)
7463 pedwarn ("ISO C does not support complex integer types");
7464 specs->type = build_complex_type (specs->type);
7468 gcc_assert (!(specs->long_p && specs->short_p));
7469 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7470 if (specs->long_long_p)
7471 specs->type = (specs->unsigned_p
7472 ? long_long_unsigned_type_node
7473 : long_long_integer_type_node);
7474 else if (specs->long_p)
7475 specs->type = (specs->unsigned_p
7476 ? long_unsigned_type_node
7477 : long_integer_type_node);
7478 else if (specs->short_p)
7479 specs->type = (specs->unsigned_p
7480 ? short_unsigned_type_node
7481 : short_integer_type_node);
7483 specs->type = (specs->unsigned_p
7484 ? unsigned_type_node
7485 : integer_type_node);
7486 if (specs->complex_p)
7489 pedwarn ("ISO C does not support complex integer types");
7490 specs->type = build_complex_type (specs->type);
7494 gcc_assert (!specs->long_p && !specs->short_p
7495 && !specs->signed_p && !specs->unsigned_p);
7496 specs->type = (specs->complex_p
7497 ? complex_float_type_node
7501 gcc_assert (!specs->long_long_p && !specs->short_p
7502 && !specs->signed_p && !specs->unsigned_p);
7505 specs->type = (specs->complex_p
7506 ? complex_long_double_type_node
7507 : long_double_type_node);
7511 specs->type = (specs->complex_p
7512 ? complex_double_type_node
7513 : double_type_node);
7523 /* Synthesize a function which calls all the global ctors or global
7524 dtors in this file. This is only used for targets which do not
7525 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7527 build_cdtor (int method_type, tree cdtors)
7534 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7535 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7538 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7541 /* A subroutine of c_write_global_declarations. Perform final processing
7542 on one file scope's declarations (or the external scope's declarations),
7546 c_write_global_declarations_1 (tree globals)
7551 /* Process the decls in the order they were written. */
7552 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7554 /* Check for used but undefined static functions using the C
7555 standard's definition of "used", and set TREE_NO_WARNING so
7556 that check_global_declarations doesn't repeat the check. */
7557 if (TREE_CODE (decl) == FUNCTION_DECL
7558 && DECL_INITIAL (decl) == 0
7559 && DECL_EXTERNAL (decl)
7560 && !TREE_PUBLIC (decl)
7561 && C_DECL_USED (decl))
7563 pedwarn ("%q+F used but never defined", decl);
7564 TREE_NO_WARNING (decl) = 1;
7567 wrapup_global_declaration_1 (decl);
7573 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7574 reconsider |= wrapup_global_declaration_2 (decl);
7578 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7579 check_global_declaration_1 (decl);
7582 /* A subroutine of c_write_global_declarations Emit debug information for each
7583 of the declarations in GLOBALS. */
7586 c_write_global_declarations_2 (tree globals)
7590 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
7591 debug_hooks->global_decl (decl);
7594 /* Preserve the external declarations scope across a garbage collect. */
7595 static GTY(()) tree ext_block;
7598 c_write_global_declarations (void)
7602 /* We don't want to do this if generating a PCH. */
7606 /* Don't waste time on further processing if -fsyntax-only or we've
7607 encountered errors. */
7608 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7611 /* Close the external scope. */
7612 ext_block = pop_scope ();
7614 gcc_assert (!current_scope);
7618 tree tmp = BLOCK_VARS (ext_block);
7620 FILE * stream = dump_begin (TDI_tu, &flags);
7623 dump_node (tmp, flags & ~TDF_SLIM, stream);
7624 dump_end (TDI_tu, stream);
7628 /* Process all file scopes in this compilation, and the external_scope,
7629 through wrapup_global_declarations and check_global_declarations. */
7630 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7631 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7632 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7634 /* Generate functions to call static constructors and destructors
7635 for targets that do not support .ctors/.dtors sections. These
7636 functions have magic names which are detected by collect2. */
7637 build_cdtor ('I', static_ctors); static_ctors = 0;
7638 build_cdtor ('D', static_dtors); static_dtors = 0;
7640 /* We're done parsing; proceed to optimize and emit assembly.
7641 FIXME: shouldn't be the front end's responsibility to call this. */
7644 /* After cgraph has had a chance to emit everything that's going to
7645 be emitted, output debug information for globals. */
7646 if (errorcount == 0 && sorrycount == 0)
7648 timevar_push (TV_SYMOUT);
7649 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7650 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
7651 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
7652 timevar_pop (TV_SYMOUT);
7658 #include "gt-c-decl.h"