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 the current toplevel function contains a declaration
158 of a nested function which is never defined. */
160 static bool undef_nested_function;
162 /* True means global_bindings_p should return false even if the scope stack
163 says we are in file scope. */
164 bool c_override_global_bindings_to_false;
167 /* Each c_binding structure describes one binding of an identifier to
168 a decl. All the decls in a scope - irrespective of namespace - are
169 chained together by the ->prev field, which (as the name implies)
170 runs in reverse order. All the decls in a given namespace bound to
171 a given identifier are chained by the ->shadowed field, which runs
172 from inner to outer scopes.
174 The ->decl field usually points to a DECL node, but there are two
175 exceptions. In the namespace of type tags, the bound entity is a
176 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
177 identifier is encountered, it is bound to error_mark_node to
178 suppress further errors about that identifier in the current
181 The ->type field stores the type of the declaration in this scope;
182 if NULL, the type is the type of the ->decl field. This is only of
183 relevance for objects with external or internal linkage which may
184 be redeclared in inner scopes, forming composite types that only
185 persist for the duration of those scopes. In the external scope,
186 this stores the composite of all the types declared for this
187 object, visible or not. The ->inner_comp field (used only at file
188 scope) stores whether an incomplete array type at file scope was
189 completed at an inner scope to an array size other than 1.
191 The depth field is copied from the scope structure that holds this
192 decl. It is used to preserve the proper ordering of the ->shadowed
193 field (see bind()) and also for a handful of special-case checks.
194 Finally, the invisible bit is true for a decl which should be
195 ignored for purposes of normal name lookup, and the nested bit is
196 true for a decl that's been bound a second time in an inner scope;
197 in all such cases, the binding in the outer scope will have its
198 invisible bit true. */
200 struct c_binding GTY((chain_next ("%h.prev")))
202 tree decl; /* the decl bound */
203 tree type; /* the type in this scope */
204 tree id; /* the identifier it's bound to */
205 struct c_binding *prev; /* the previous decl in this scope */
206 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
207 unsigned int depth : 28; /* depth of this scope */
208 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
209 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
210 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
213 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
214 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
215 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
216 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
218 #define I_SYMBOL_BINDING(node) \
219 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
220 #define I_SYMBOL_DECL(node) \
221 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
223 #define I_TAG_BINDING(node) \
224 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
225 #define I_TAG_DECL(node) \
226 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
228 #define I_LABEL_BINDING(node) \
229 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
230 #define I_LABEL_DECL(node) \
231 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
233 /* Each C symbol points to three linked lists of c_binding structures.
234 These describe the values of the identifier in the three different
235 namespaces defined by the language. */
237 struct lang_identifier GTY(())
239 struct c_common_identifier common_id;
240 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
241 struct c_binding *tag_binding; /* struct/union/enum tags */
242 struct c_binding *label_binding; /* labels */
245 /* Validate c-lang.c's assumptions. */
246 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
247 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
249 /* The resulting tree type. */
252 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
253 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)")))
255 union tree_node GTY ((tag ("0"),
256 desc ("tree_node_structure (&%h)")))
258 struct lang_identifier GTY ((tag ("1"))) identifier;
261 /* Each c_scope structure describes the complete contents of one
262 scope. Four scopes are distinguished specially: the innermost or
263 current scope, the innermost function scope, the file scope (always
264 the second to outermost) and the outermost or external scope.
266 Most declarations are recorded in the current scope.
268 All normal label declarations are recorded in the innermost
269 function scope, as are bindings of undeclared identifiers to
270 error_mark_node. (GCC permits nested functions as an extension,
271 hence the 'innermost' qualifier.) Explicitly declared labels
272 (using the __label__ extension) appear in the current scope.
274 Being in the file scope (current_scope == file_scope) causes
275 special behavior in several places below. Also, under some
276 conditions the Objective-C front end records declarations in the
277 file scope even though that isn't the current scope.
279 All declarations with external linkage are recorded in the external
280 scope, even if they aren't visible there; this models the fact that
281 such declarations are visible to the entire program, and (with a
282 bit of cleverness, see pushdecl) allows diagnosis of some violations
283 of C99 6.2.2p7 and 6.2.7p2:
285 If, within the same translation unit, the same identifier appears
286 with both internal and external linkage, the behavior is
289 All declarations that refer to the same object or function shall
290 have compatible type; otherwise, the behavior is undefined.
292 Initially only the built-in declarations, which describe compiler
293 intrinsic functions plus a subset of the standard library, are in
296 The order of the blocks list matters, and it is frequently appended
297 to. To avoid having to walk all the way to the end of the list on
298 each insertion, or reverse the list later, we maintain a pointer to
299 the last list entry. (FIXME: It should be feasible to use a reversed
302 The bindings list is strictly in reverse order of declarations;
303 pop_scope relies on this. */
306 struct c_scope GTY((chain_next ("%h.outer")))
308 /* The scope containing this one. */
309 struct c_scope *outer;
311 /* The next outermost function scope. */
312 struct c_scope *outer_function;
314 /* All bindings in this scope. */
315 struct c_binding *bindings;
317 /* For each scope (except the global one), a chain of BLOCK nodes
318 for all the scopes that were entered and exited one level down. */
322 /* The depth of this scope. Used to keep the ->shadowed chain of
323 bindings sorted innermost to outermost. */
324 unsigned int depth : 28;
326 /* True if we are currently filling this scope with parameter
328 BOOL_BITFIELD parm_flag : 1;
330 /* True if we saw [*] in this scope. Used to give an error messages
331 if these appears in a function definition. */
332 BOOL_BITFIELD had_vla_unspec : 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)
797 && scope != file_scope
798 && scope != external_scope)
800 error ("nested function %q+D declared but never defined", p);
801 undef_nested_function = true;
803 /* C99 6.7.4p6: "a function with external linkage... declared
804 with an inline function specifier ... shall also be defined in the
805 same translation unit." */
806 else if (DECL_DECLARED_INLINE_P (p)
810 pedwarn ("inline function %q+D declared but never defined", p);
815 /* Warnings for unused variables. */
817 && !TREE_NO_WARNING (p)
818 && !DECL_IN_SYSTEM_HEADER (p)
820 && !DECL_ARTIFICIAL (p)
821 && scope != file_scope
822 && scope != external_scope)
823 warning (OPT_Wunused_variable, "unused variable %q+D", p);
827 error ("type of array %q+D completed incompatibly with"
828 " implicit initialization", p);
835 /* All of these go in BLOCK_VARS, but only if this is the
836 binding in the home scope. */
839 TREE_CHAIN (p) = BLOCK_VARS (block);
840 BLOCK_VARS (block) = p;
842 /* If this is the file scope, and we are processing more
843 than one translation unit in this compilation, set
844 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
845 This makes same_translation_unit_p work, and causes
846 static declarations to be given disambiguating suffixes. */
847 if (scope == file_scope && num_in_fnames > 1)
849 DECL_CONTEXT (p) = context;
850 if (TREE_CODE (p) == TYPE_DECL)
851 set_type_context (TREE_TYPE (p), context);
855 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
856 already been put there by store_parm_decls. Unused-
857 parameter warnings are handled by function.c.
858 error_mark_node obviously does not go in BLOCK_VARS and
859 does not get unused-variable warnings. */
862 /* It is possible for a decl not to have a name. We get
863 here with b->id NULL in this case. */
866 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
867 I_SYMBOL_BINDING (b->id) = b->shadowed;
868 if (b->shadowed && b->shadowed->type)
869 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
879 /* Dispose of the block that we just made inside some higher level. */
880 if ((scope->function_body || scope == file_scope) && context)
882 DECL_INITIAL (context) = block;
883 BLOCK_SUPERCONTEXT (block) = context;
885 else if (scope->outer)
888 SCOPE_LIST_APPEND (scope->outer, blocks, block);
889 /* If we did not make a block for the scope just exited, any
890 blocks made for inner scopes must be carried forward so they
891 will later become subblocks of something else. */
892 else if (scope->blocks)
893 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
896 /* Pop the current scope, and free the structure for reuse. */
897 current_scope = scope->outer;
898 if (scope->function_body)
899 current_function_scope = scope->outer_function;
901 memset (scope, 0, sizeof (struct c_scope));
902 scope->outer = scope_freelist;
903 scope_freelist = scope;
909 push_file_scope (void)
917 file_scope = current_scope;
919 start_fname_decls ();
921 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
922 bind (DECL_NAME (decl), decl, file_scope,
923 /*invisible=*/false, /*nested=*/true);
927 pop_file_scope (void)
929 /* In case there were missing closebraces, get us back to the global
931 while (current_scope != file_scope)
934 /* __FUNCTION__ is defined at file scope (""). This
935 call may not be necessary as my tests indicate it
936 still works without it. */
937 finish_fname_decls ();
939 /* This is the point to write out a PCH if we're doing that.
940 In that case we do not want to do anything else. */
943 c_common_write_pch ();
947 /* Pop off the file scope and close this translation unit. */
951 maybe_apply_pending_pragma_weaks ();
952 cgraph_finalize_compilation_unit ();
955 /* Insert BLOCK at the end of the list of subblocks of the current
956 scope. This is used when a BIND_EXPR is expanded, to handle the
957 BLOCK node inside the BIND_EXPR. */
960 insert_block (tree block)
962 TREE_USED (block) = 1;
963 SCOPE_LIST_APPEND (current_scope, blocks, block);
966 /* Push a definition or a declaration of struct, union or enum tag "name".
967 "type" should be the type node.
968 We assume that the tag "name" is not already defined.
970 Note that the definition may really be just a forward reference.
971 In that case, the TYPE_SIZE will be zero. */
974 pushtag (tree name, tree type)
976 /* Record the identifier as the type's name if it has none. */
977 if (name && !TYPE_NAME (type))
978 TYPE_NAME (type) = name;
979 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
981 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
982 tagged type we just added to the current scope. This fake
983 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
984 to output a representation of a tagged type, and it also gives
985 us a convenient place to record the "scope start" address for the
988 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
990 /* An approximation for now, so we can tell this is a function-scope tag.
991 This will be updated in pop_scope. */
992 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
995 /* Subroutine of compare_decls. Allow harmless mismatches in return
996 and argument types provided that the type modes match. This function
997 return a unified type given a suitable match, and 0 otherwise. */
1000 match_builtin_function_types (tree newtype, tree oldtype)
1002 tree newrettype, oldrettype;
1003 tree newargs, oldargs;
1004 tree trytype, tryargs;
1006 /* Accept the return type of the new declaration if same modes. */
1007 oldrettype = TREE_TYPE (oldtype);
1008 newrettype = TREE_TYPE (newtype);
1010 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1013 oldargs = TYPE_ARG_TYPES (oldtype);
1014 newargs = TYPE_ARG_TYPES (newtype);
1017 while (oldargs || newargs)
1021 || !TREE_VALUE (oldargs)
1022 || !TREE_VALUE (newargs)
1023 || TYPE_MODE (TREE_VALUE (oldargs))
1024 != TYPE_MODE (TREE_VALUE (newargs)))
1027 oldargs = TREE_CHAIN (oldargs);
1028 newargs = TREE_CHAIN (newargs);
1031 trytype = build_function_type (newrettype, tryargs);
1032 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1035 /* Subroutine of diagnose_mismatched_decls. Check for function type
1036 mismatch involving an empty arglist vs a nonempty one and give clearer
1039 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1040 tree newtype, tree oldtype)
1044 if (TREE_CODE (olddecl) != FUNCTION_DECL
1045 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1046 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1048 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1051 t = TYPE_ARG_TYPES (oldtype);
1053 t = TYPE_ARG_TYPES (newtype);
1054 for (; t; t = TREE_CHAIN (t))
1056 tree type = TREE_VALUE (t);
1058 if (TREE_CHAIN (t) == 0
1059 && TYPE_MAIN_VARIANT (type) != void_type_node)
1061 inform ("a parameter list with an ellipsis can%'t match "
1062 "an empty parameter name list declaration");
1066 if (c_type_promotes_to (type) != type)
1068 inform ("an argument type that has a default promotion can%'t match "
1069 "an empty parameter name list declaration");
1075 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1076 old-style function definition, NEWDECL is a prototype declaration.
1077 Diagnose inconsistencies in the argument list. Returns TRUE if
1078 the prototype is compatible, FALSE if not. */
1080 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1082 tree newargs, oldargs;
1085 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1087 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1088 newargs = TYPE_ARG_TYPES (newtype);
1093 tree oldargtype = TREE_VALUE (oldargs);
1094 tree newargtype = TREE_VALUE (newargs);
1096 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1099 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1100 newargtype = TYPE_MAIN_VARIANT (newargtype);
1102 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1105 /* Reaching the end of just one list means the two decls don't
1106 agree on the number of arguments. */
1107 if (END_OF_ARGLIST (oldargtype))
1109 error ("prototype for %q+D declares more arguments "
1110 "than previous old-style definition", newdecl);
1113 else if (END_OF_ARGLIST (newargtype))
1115 error ("prototype for %q+D declares fewer arguments "
1116 "than previous old-style definition", newdecl);
1120 /* Type for passing arg must be consistent with that declared
1122 else if (!comptypes (oldargtype, newargtype))
1124 error ("prototype for %q+D declares argument %d"
1125 " with incompatible type",
1130 oldargs = TREE_CHAIN (oldargs);
1131 newargs = TREE_CHAIN (newargs);
1135 /* If we get here, no errors were found, but do issue a warning
1136 for this poor-style construct. */
1137 warning (0, "prototype for %q+D follows non-prototype definition",
1140 #undef END_OF_ARGLIST
1143 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1144 first in a pair of mismatched declarations, using the diagnostic
1147 locate_old_decl (tree decl, void (*diag)(const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2))
1149 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1151 else if (DECL_INITIAL (decl))
1152 diag (G_("previous definition of %q+D was here"), decl);
1153 else if (C_DECL_IMPLICIT (decl))
1154 diag (G_("previous implicit declaration of %q+D was here"), decl);
1156 diag (G_("previous declaration of %q+D was here"), decl);
1159 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1160 Returns true if the caller should proceed to merge the two, false
1161 if OLDDECL should simply be discarded. As a side effect, issues
1162 all necessary diagnostics for invalid or poor-style combinations.
1163 If it returns true, writes the types of NEWDECL and OLDDECL to
1164 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1165 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1168 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1169 tree *newtypep, tree *oldtypep)
1171 tree newtype, oldtype;
1172 bool pedwarned = false;
1173 bool warned = false;
1176 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1177 && DECL_EXTERNAL (DECL))
1179 /* If we have error_mark_node for either decl or type, just discard
1180 the previous decl - we're in an error cascade already. */
1181 if (olddecl == error_mark_node || newdecl == error_mark_node)
1183 *oldtypep = oldtype = TREE_TYPE (olddecl);
1184 *newtypep = newtype = TREE_TYPE (newdecl);
1185 if (oldtype == error_mark_node || newtype == error_mark_node)
1188 /* Two different categories of symbol altogether. This is an error
1189 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1190 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1192 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1193 && DECL_BUILT_IN (olddecl)
1194 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1196 error ("%q+D redeclared as different kind of symbol", newdecl);
1197 locate_old_decl (olddecl, error);
1199 else if (TREE_PUBLIC (newdecl))
1200 warning (0, "built-in function %q+D declared as non-function",
1203 warning (OPT_Wshadow, "declaration of %q+D shadows "
1204 "a built-in function", newdecl);
1208 /* Enumerators have no linkage, so may only be declared once in a
1210 if (TREE_CODE (olddecl) == CONST_DECL)
1212 error ("redeclaration of enumerator %q+D", newdecl);
1213 locate_old_decl (olddecl, error);
1217 if (!comptypes (oldtype, newtype))
1219 if (TREE_CODE (olddecl) == FUNCTION_DECL
1220 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1222 /* Accept harmless mismatch in function types.
1223 This is for the ffs and fprintf builtins. */
1224 tree trytype = match_builtin_function_types (newtype, oldtype);
1226 if (trytype && comptypes (newtype, trytype))
1227 *oldtypep = oldtype = trytype;
1230 /* If types don't match for a built-in, throw away the
1231 built-in. No point in calling locate_old_decl here, it
1232 won't print anything. */
1233 warning (0, "conflicting types for built-in function %q+D",
1238 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1239 && DECL_IS_BUILTIN (olddecl))
1241 /* A conflicting function declaration for a predeclared
1242 function that isn't actually built in. Objective C uses
1243 these. The new declaration silently overrides everything
1244 but the volatility (i.e. noreturn) indication. See also
1245 below. FIXME: Make Objective C use normal builtins. */
1246 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1249 /* Permit void foo (...) to match int foo (...) if the latter is
1250 the definition and implicit int was used. See
1251 c-torture/compile/920625-2.c. */
1252 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1253 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1254 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1255 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1257 pedwarn ("conflicting types for %q+D", newdecl);
1258 /* Make sure we keep void as the return type. */
1259 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1260 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1263 /* Permit void foo (...) to match an earlier call to foo (...) with
1264 no declared type (thus, implicitly int). */
1265 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1266 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1267 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1268 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1270 pedwarn ("conflicting types for %q+D", newdecl);
1271 /* Make sure we keep void as the return type. */
1272 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1277 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1278 error ("conflicting type qualifiers for %q+D", newdecl);
1280 error ("conflicting types for %q+D", newdecl);
1281 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1282 locate_old_decl (olddecl, error);
1287 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1288 but silently ignore the redeclaration if either is in a system
1289 header. (Conflicting redeclarations were handled above.) */
1290 if (TREE_CODE (newdecl) == TYPE_DECL)
1292 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1293 return true; /* Allow OLDDECL to continue in use. */
1295 error ("redefinition of typedef %q+D", newdecl);
1296 locate_old_decl (olddecl, error);
1300 /* Function declarations can either be 'static' or 'extern' (no
1301 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1302 can never conflict with each other on account of linkage
1303 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1304 gnu89 mode permits two definitions if one is 'extern inline' and
1305 one is not. The non- extern-inline definition supersedes the
1306 extern-inline definition. */
1308 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1310 /* If you declare a built-in function name as static, or
1311 define the built-in with an old-style definition (so we
1312 can't validate the argument list) the built-in definition is
1313 overridden, but optionally warn this was a bad choice of name. */
1314 if (DECL_BUILT_IN (olddecl)
1315 && !C_DECL_DECLARED_BUILTIN (olddecl)
1316 && (!TREE_PUBLIC (newdecl)
1317 || (DECL_INITIAL (newdecl)
1318 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1320 warning (OPT_Wshadow, "declaration of %q+D shadows "
1321 "a built-in function", newdecl);
1322 /* Discard the old built-in function. */
1326 if (DECL_INITIAL (newdecl))
1328 if (DECL_INITIAL (olddecl))
1330 /* If both decls are in the same TU and the new declaration
1331 isn't overriding an extern inline reject the new decl.
1332 In c99, no overriding is allowed in the same translation
1334 if ((!DECL_EXTERN_INLINE (olddecl)
1335 || DECL_EXTERN_INLINE (newdecl)
1337 && same_translation_unit_p (newdecl, olddecl))
1339 error ("redefinition of %q+D", newdecl);
1340 locate_old_decl (olddecl, error);
1345 /* If we have a prototype after an old-style function definition,
1346 the argument types must be checked specially. */
1347 else if (DECL_INITIAL (olddecl)
1348 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1349 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1350 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1352 locate_old_decl (olddecl, error);
1355 /* A non-static declaration (even an "extern") followed by a
1356 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1357 The same is true for a static forward declaration at block
1358 scope followed by a non-static declaration/definition at file
1359 scope. Static followed by non-static at the same scope is
1360 not undefined behavior, and is the most convenient way to get
1361 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1362 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1363 we do diagnose it if -Wtraditional. */
1364 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1366 /* Two exceptions to the rule. If olddecl is an extern
1367 inline, or a predeclared function that isn't actually
1368 built in, newdecl silently overrides olddecl. The latter
1369 occur only in Objective C; see also above. (FIXME: Make
1370 Objective C use normal builtins.) */
1371 if (!DECL_IS_BUILTIN (olddecl)
1372 && !DECL_EXTERN_INLINE (olddecl))
1374 error ("static declaration of %q+D follows "
1375 "non-static declaration", newdecl);
1376 locate_old_decl (olddecl, error);
1380 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1382 if (DECL_CONTEXT (olddecl))
1384 error ("non-static declaration of %q+D follows "
1385 "static declaration", newdecl);
1386 locate_old_decl (olddecl, error);
1389 else if (warn_traditional)
1391 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1392 "follows static declaration", newdecl);
1397 else if (TREE_CODE (newdecl) == VAR_DECL)
1399 /* Only variables can be thread-local, and all declarations must
1400 agree on this property. */
1401 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1403 /* Nothing to check. Since OLDDECL is marked threadprivate
1404 and NEWDECL does not have a thread-local attribute, we
1405 will merge the threadprivate attribute into NEWDECL. */
1408 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1410 if (DECL_THREAD_LOCAL_P (newdecl))
1411 error ("thread-local declaration of %q+D follows "
1412 "non-thread-local declaration", newdecl);
1414 error ("non-thread-local declaration of %q+D follows "
1415 "thread-local declaration", newdecl);
1417 locate_old_decl (olddecl, error);
1421 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1422 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1424 error ("redefinition of %q+D", newdecl);
1425 locate_old_decl (olddecl, error);
1429 /* Objects declared at file scope: if the first declaration had
1430 external linkage (even if it was an external reference) the
1431 second must have external linkage as well, or the behavior is
1432 undefined. If the first declaration had internal linkage, then
1433 the second must too, or else be an external reference (in which
1434 case the composite declaration still has internal linkage).
1435 As for function declarations, we warn about the static-then-
1436 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1437 if (DECL_FILE_SCOPE_P (newdecl)
1438 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1440 if (DECL_EXTERNAL (newdecl))
1442 if (!DECL_FILE_SCOPE_P (olddecl))
1444 error ("extern declaration of %q+D follows "
1445 "declaration with no linkage", newdecl);
1446 locate_old_decl (olddecl, error);
1449 else if (warn_traditional)
1451 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1452 "follows static declaration", newdecl);
1458 if (TREE_PUBLIC (newdecl))
1459 error ("non-static declaration of %q+D follows "
1460 "static declaration", newdecl);
1462 error ("static declaration of %q+D follows "
1463 "non-static declaration", newdecl);
1465 locate_old_decl (olddecl, error);
1469 /* Two objects with the same name declared at the same block
1470 scope must both be external references (6.7p3). */
1471 else if (!DECL_FILE_SCOPE_P (newdecl))
1473 if (DECL_EXTERNAL (newdecl))
1475 /* Extern with initializer at block scope, which will
1476 already have received an error. */
1478 else if (DECL_EXTERNAL (olddecl))
1480 error ("declaration of %q+D with no linkage follows "
1481 "extern declaration", newdecl);
1482 locate_old_decl (olddecl, error);
1486 error ("redeclaration of %q+D with no linkage", newdecl);
1487 locate_old_decl (olddecl, error);
1495 /* All decls must agree on a visibility. */
1496 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
1497 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1498 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1500 warning (0, "redeclaration of %q+D with different visibility "
1501 "(old visibility preserved)", newdecl);
1505 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1507 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1508 if (DECL_DECLARED_INLINE_P (newdecl)
1509 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1511 warning (OPT_Wattributes, "inline declaration of %qD follows "
1512 "declaration with attribute noinline", newdecl);
1515 else if (DECL_DECLARED_INLINE_P (olddecl)
1516 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1518 warning (OPT_Wattributes, "declaration of %q+D with attribute "
1519 "noinline follows inline declaration ", newdecl);
1523 /* Inline declaration after use or definition.
1524 ??? Should we still warn about this now we have unit-at-a-time
1525 mode and can get it right?
1526 Definitely don't complain if the decls are in different translation
1528 C99 permits this, so don't warn in that case. (The function
1529 may not be inlined everywhere in function-at-a-time mode, but
1530 we still shouldn't warn.) */
1531 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1532 && same_translation_unit_p (olddecl, newdecl)
1535 if (TREE_USED (olddecl))
1537 warning (0, "%q+D declared inline after being called", olddecl);
1540 else if (DECL_INITIAL (olddecl))
1542 warning (0, "%q+D declared inline after its definition", olddecl);
1547 else /* PARM_DECL, VAR_DECL */
1549 /* Redeclaration of a parameter is a constraint violation (this is
1550 not explicitly stated, but follows from C99 6.7p3 [no more than
1551 one declaration of the same identifier with no linkage in the
1552 same scope, except type tags] and 6.2.2p6 [parameters have no
1553 linkage]). We must check for a forward parameter declaration,
1554 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1555 an extension, the mandatory diagnostic for which is handled by
1556 mark_forward_parm_decls. */
1558 if (TREE_CODE (newdecl) == PARM_DECL
1559 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1561 error ("redefinition of parameter %q+D", newdecl);
1562 locate_old_decl (olddecl, error);
1567 /* Optional warning for completely redundant decls. */
1568 if (!warned && !pedwarned
1569 && warn_redundant_decls
1570 /* Don't warn about a function declaration followed by a
1572 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1573 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1574 /* Don't warn about redundant redeclarations of builtins. */
1575 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1576 && !DECL_BUILT_IN (newdecl)
1577 && DECL_BUILT_IN (olddecl)
1578 && !C_DECL_DECLARED_BUILTIN (olddecl))
1579 /* Don't warn about an extern followed by a definition. */
1580 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1581 /* Don't warn about forward parameter decls. */
1582 && !(TREE_CODE (newdecl) == PARM_DECL
1583 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1584 /* Don't warn about a variable definition following a declaration. */
1585 && !(TREE_CODE (newdecl) == VAR_DECL
1586 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
1588 warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
1593 /* Report location of previous decl/defn in a consistent manner. */
1594 if (warned || pedwarned)
1595 locate_old_decl (olddecl, pedwarned ? pedwarn : warning0);
1597 #undef DECL_EXTERN_INLINE
1602 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1603 consistent with OLDDECL, but carries new information. Merge the
1604 new information into OLDDECL. This function issues no
1608 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1610 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1611 && DECL_INITIAL (newdecl) != 0);
1612 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
1613 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
1614 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
1615 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
1616 bool extern_changed = false;
1618 /* For real parm decl following a forward decl, rechain the old decl
1619 in its new location and clear TREE_ASM_WRITTEN (it's not a
1620 forward decl anymore). */
1621 if (TREE_CODE (newdecl) == PARM_DECL
1622 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1624 struct c_binding *b, **here;
1626 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1627 if ((*here)->decl == olddecl)
1634 b->prev = current_scope->bindings;
1635 current_scope->bindings = b;
1637 TREE_ASM_WRITTEN (olddecl) = 0;
1640 DECL_ATTRIBUTES (newdecl)
1641 = targetm.merge_decl_attributes (olddecl, newdecl);
1643 /* Merge the data types specified in the two decls. */
1645 = TREE_TYPE (olddecl)
1646 = composite_type (newtype, oldtype);
1648 /* Lay the type out, unless already done. */
1649 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1651 if (TREE_TYPE (newdecl) != error_mark_node)
1652 layout_type (TREE_TYPE (newdecl));
1653 if (TREE_CODE (newdecl) != FUNCTION_DECL
1654 && TREE_CODE (newdecl) != TYPE_DECL
1655 && TREE_CODE (newdecl) != CONST_DECL)
1656 layout_decl (newdecl, 0);
1660 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1661 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1662 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1663 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1664 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1665 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1667 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1668 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1673 /* Merge the type qualifiers. */
1674 if (TREE_READONLY (newdecl))
1675 TREE_READONLY (olddecl) = 1;
1677 if (TREE_THIS_VOLATILE (newdecl))
1679 TREE_THIS_VOLATILE (olddecl) = 1;
1680 if (TREE_CODE (newdecl) == VAR_DECL)
1681 make_var_volatile (newdecl);
1684 /* Merge deprecatedness. */
1685 if (TREE_DEPRECATED (newdecl))
1686 TREE_DEPRECATED (olddecl) = 1;
1688 /* Keep source location of definition rather than declaration and of
1689 prototype rather than non-prototype unless that prototype is
1691 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1692 || (old_is_prototype && !new_is_prototype
1693 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1694 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1696 /* Merge the initialization information. */
1697 if (DECL_INITIAL (newdecl) == 0)
1698 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1700 /* Merge the threadprivate attribute. */
1701 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
1703 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1704 C_DECL_THREADPRIVATE_P (newdecl) = 1;
1707 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1709 /* Merge the unused-warning information. */
1710 if (DECL_IN_SYSTEM_HEADER (olddecl))
1711 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1712 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1713 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1715 /* Merge the section attribute.
1716 We want to issue an error if the sections conflict but that
1717 must be done later in decl_attributes since we are called
1718 before attributes are assigned. */
1719 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1720 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1722 /* Copy the assembler name.
1723 Currently, it can only be defined in the prototype. */
1724 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1726 /* Use visibility of whichever declaration had it specified */
1727 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1729 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1730 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1733 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1735 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1736 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1737 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1738 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1739 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1740 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1741 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1742 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1743 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1744 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1747 /* Merge the storage class information. */
1748 merge_weak (newdecl, olddecl);
1750 /* For functions, static overrides non-static. */
1751 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1753 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1754 /* This is since we don't automatically
1755 copy the attributes of NEWDECL into OLDDECL. */
1756 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1757 /* If this clears `static', clear it in the identifier too. */
1758 if (!TREE_PUBLIC (olddecl))
1759 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1763 /* In c99, 'extern' declaration before (or after) 'inline' means this
1764 function is not DECL_EXTERNAL. */
1765 if (TREE_CODE (newdecl) == FUNCTION_DECL
1766 && (DECL_DECLARED_INLINE_P (newdecl)
1767 || DECL_DECLARED_INLINE_P (olddecl))
1768 && (!DECL_DECLARED_INLINE_P (newdecl)
1769 || !DECL_DECLARED_INLINE_P (olddecl)
1770 || !DECL_EXTERNAL (olddecl))
1771 && DECL_EXTERNAL (newdecl)
1773 DECL_EXTERNAL (newdecl) = 0;
1775 if (DECL_EXTERNAL (newdecl))
1777 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1778 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1780 /* An extern decl does not override previous storage class. */
1781 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1782 if (!DECL_EXTERNAL (newdecl))
1784 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1785 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1790 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1791 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1794 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1796 /* If we're redefining a function previously defined as extern
1797 inline, make sure we emit debug info for the inline before we
1798 throw it away, in case it was inlined into a function that
1799 hasn't been written out yet. */
1800 if (new_is_definition && DECL_INITIAL (olddecl))
1802 if (TREE_USED (olddecl)
1803 /* In unit-at-a-time mode we never inline re-defined extern
1804 inline functions. */
1805 && !flag_unit_at_a_time
1806 && cgraph_function_possibly_inlined_p (olddecl))
1807 (*debug_hooks->outlining_inline_function) (olddecl);
1809 /* The new defn must not be inline. */
1810 DECL_INLINE (newdecl) = 0;
1811 DECL_UNINLINABLE (newdecl) = 1;
1815 /* If either decl says `inline', this fn is inline, unless
1816 its definition was passed already. */
1817 if (DECL_DECLARED_INLINE_P (newdecl)
1818 || DECL_DECLARED_INLINE_P (olddecl))
1819 DECL_DECLARED_INLINE_P (newdecl) = 1;
1821 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1822 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1825 if (DECL_BUILT_IN (olddecl))
1827 /* If redeclaring a builtin function, it stays built in.
1828 But it gets tagged as having been declared. */
1829 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1830 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1831 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1832 if (new_is_prototype)
1833 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1835 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1836 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1839 /* Also preserve various other info from the definition. */
1840 if (!new_is_definition)
1842 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1843 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1844 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1845 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1846 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1848 /* Set DECL_INLINE on the declaration if we've got a body
1849 from which to instantiate. */
1850 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1852 DECL_INLINE (newdecl) = 1;
1853 DECL_ABSTRACT_ORIGIN (newdecl)
1854 = DECL_ABSTRACT_ORIGIN (olddecl);
1859 /* If a previous declaration said inline, mark the
1860 definition as inlinable. */
1861 if (DECL_DECLARED_INLINE_P (newdecl)
1862 && !DECL_UNINLINABLE (newdecl))
1863 DECL_INLINE (newdecl) = 1;
1867 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
1869 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1870 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1872 unsigned olddecl_uid = DECL_UID (olddecl);
1873 tree olddecl_context = DECL_CONTEXT (olddecl);
1875 memcpy ((char *) olddecl + sizeof (struct tree_common),
1876 (char *) newdecl + sizeof (struct tree_common),
1877 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1878 switch (TREE_CODE (olddecl))
1888 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1889 (char *) newdecl + sizeof (struct tree_decl_common),
1890 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1895 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1896 (char *) newdecl + sizeof (struct tree_decl_common),
1897 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1899 DECL_UID (olddecl) = olddecl_uid;
1900 DECL_CONTEXT (olddecl) = olddecl_context;
1903 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1904 so that encode_section_info has a chance to look at the new decl
1905 flags and attributes. */
1906 if (DECL_RTL_SET_P (olddecl)
1907 && (TREE_CODE (olddecl) == FUNCTION_DECL
1908 || (TREE_CODE (olddecl) == VAR_DECL
1909 && TREE_STATIC (olddecl))))
1910 make_decl_rtl (olddecl);
1912 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1913 and the definition is coming from the old version, cgraph needs
1914 to be called again. */
1915 if (extern_changed && !new_is_definition
1916 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
1917 cgraph_finalize_function (olddecl, false);
1920 /* Handle when a new declaration NEWDECL has the same name as an old
1921 one OLDDECL in the same binding contour. Prints an error message
1924 If safely possible, alter OLDDECL to look like NEWDECL, and return
1925 true. Otherwise, return false. */
1928 duplicate_decls (tree newdecl, tree olddecl)
1930 tree newtype = NULL, oldtype = NULL;
1932 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1934 /* Avoid `unused variable' and other warnings warnings for OLDDECL. */
1935 TREE_NO_WARNING (olddecl) = 1;
1939 merge_decls (newdecl, olddecl, newtype, oldtype);
1944 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1946 warn_if_shadowing (tree new_decl)
1948 struct c_binding *b;
1950 /* Shadow warnings wanted? */
1952 /* No shadow warnings for internally generated vars. */
1953 || DECL_IS_BUILTIN (new_decl)
1954 /* No shadow warnings for vars made for inlining. */
1955 || DECL_FROM_INLINE (new_decl))
1958 /* Is anything being shadowed? Invisible decls do not count. */
1959 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1960 if (b->decl && b->decl != new_decl && !b->invisible)
1962 tree old_decl = b->decl;
1964 if (old_decl == error_mark_node)
1966 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1967 "non-variable", new_decl);
1970 else if (TREE_CODE (old_decl) == PARM_DECL)
1971 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
1973 else if (DECL_FILE_SCOPE_P (old_decl))
1974 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
1975 "declaration", new_decl);
1976 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1977 && DECL_BUILT_IN (old_decl))
1979 warning (OPT_Wshadow, "declaration of %q+D shadows "
1980 "a built-in function", new_decl);
1984 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
1987 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
1994 /* Subroutine of pushdecl.
1996 X is a TYPE_DECL for a typedef statement. Create a brand new
1997 ..._TYPE node (which will be just a variant of the existing
1998 ..._TYPE node with identical properties) and then install X
1999 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2001 The whole point here is to end up with a situation where each
2002 and every ..._TYPE node the compiler creates will be uniquely
2003 associated with AT MOST one node representing a typedef name.
2004 This way, even though the compiler substitutes corresponding
2005 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2006 early on, later parts of the compiler can always do the reverse
2007 translation and get back the corresponding typedef name. For
2010 typedef struct S MY_TYPE;
2013 Later parts of the compiler might only know that `object' was of
2014 type `struct S' if it were not for code just below. With this
2015 code however, later parts of the compiler see something like:
2017 struct S' == struct S
2018 typedef struct S' MY_TYPE;
2021 And they can then deduce (from the node for type struct S') that
2022 the original object declaration was:
2026 Being able to do this is important for proper support of protoize,
2027 and also for generating precise symbolic debugging information
2028 which takes full account of the programmer's (typedef) vocabulary.
2030 Obviously, we don't want to generate a duplicate ..._TYPE node if
2031 the TYPE_DECL node that we are now processing really represents a
2032 standard built-in type.
2034 Since all standard types are effectively declared at line zero
2035 in the source file, we can easily check to see if we are working
2036 on a standard type by checking the current value of lineno. */
2039 clone_underlying_type (tree x)
2041 if (DECL_IS_BUILTIN (x))
2043 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2044 TYPE_NAME (TREE_TYPE (x)) = x;
2046 else if (TREE_TYPE (x) != error_mark_node
2047 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2049 tree tt = TREE_TYPE (x);
2050 DECL_ORIGINAL_TYPE (x) = tt;
2051 tt = build_variant_type_copy (tt);
2053 TREE_USED (tt) = TREE_USED (x);
2058 /* Record a decl-node X as belonging to the current lexical scope.
2059 Check for errors (such as an incompatible declaration for the same
2060 name already seen in the same scope).
2062 Returns either X or an old decl for the same name.
2063 If an old decl is returned, it may have been smashed
2064 to agree with what X says. */
2069 tree name = DECL_NAME (x);
2070 struct c_scope *scope = current_scope;
2071 struct c_binding *b;
2072 bool nested = false;
2074 /* Functions need the lang_decl data. */
2075 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
2076 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
2078 /* Must set DECL_CONTEXT for everything not at file scope or
2079 DECL_FILE_SCOPE_P won't work. Local externs don't count
2080 unless they have initializers (which generate code). */
2081 if (current_function_decl
2082 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2083 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2084 DECL_CONTEXT (x) = current_function_decl;
2086 /* If this is of variably modified type, prevent jumping into its
2088 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2089 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2090 c_begin_vm_scope (scope->depth);
2092 /* Anonymous decls are just inserted in the scope. */
2095 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
2099 /* First, see if there is another declaration with the same name in
2100 the current scope. If there is, duplicate_decls may do all the
2101 work for us. If duplicate_decls returns false, that indicates
2102 two incompatible decls in the same scope; we are to silently
2103 replace the old one (duplicate_decls has issued all appropriate
2104 diagnostics). In particular, we should not consider possible
2105 duplicates in the external scope, or shadowing. */
2106 b = I_SYMBOL_BINDING (name);
2107 if (b && B_IN_SCOPE (b, scope))
2109 struct c_binding *b_ext, *b_use;
2110 tree type = TREE_TYPE (x);
2111 tree visdecl = b->decl;
2112 tree vistype = TREE_TYPE (visdecl);
2113 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2114 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2115 b->inner_comp = false;
2118 /* If this is an external linkage declaration, we should check
2119 for compatibility with the type in the external scope before
2120 setting the type at this scope based on the visible
2121 information only. */
2122 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2124 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2125 b_ext = b_ext->shadowed;
2130 TREE_TYPE (b_use->decl) = b_use->type;
2133 if (duplicate_decls (x, b_use->decl))
2137 /* Save the updated type in the external scope and
2138 restore the proper type for this scope. */
2140 if (comptypes (vistype, type))
2141 thistype = composite_type (vistype, type);
2143 thistype = TREE_TYPE (b_use->decl);
2144 b_use->type = TREE_TYPE (b_use->decl);
2145 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2146 && DECL_BUILT_IN (b_use->decl))
2148 = build_type_attribute_variant (thistype,
2151 TREE_TYPE (b_use->decl) = thistype;
2156 goto skip_external_and_shadow_checks;
2159 /* All declarations with external linkage, and all external
2160 references, go in the external scope, no matter what scope is
2161 current. However, the binding in that scope is ignored for
2162 purposes of normal name lookup. A separate binding structure is
2163 created in the requested scope; this governs the normal
2164 visibility of the symbol.
2166 The binding in the externals scope is used exclusively for
2167 detecting duplicate declarations of the same object, no matter
2168 what scope they are in; this is what we do here. (C99 6.2.7p2:
2169 All declarations that refer to the same object or function shall
2170 have compatible type; otherwise, the behavior is undefined.) */
2171 if (DECL_EXTERNAL (x) || scope == file_scope)
2173 tree type = TREE_TYPE (x);
2176 bool type_saved = false;
2177 if (b && !B_IN_EXTERNAL_SCOPE (b)
2178 && (TREE_CODE (b->decl) == FUNCTION_DECL
2179 || TREE_CODE (b->decl) == VAR_DECL)
2180 && DECL_FILE_SCOPE_P (b->decl))
2183 vistype = TREE_TYPE (visdecl);
2185 if (scope != file_scope
2186 && !DECL_IN_SYSTEM_HEADER (x))
2187 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2189 while (b && !B_IN_EXTERNAL_SCOPE (b))
2191 /* If this decl might be modified, save its type. This is
2192 done here rather than when the decl is first bound
2193 because the type may change after first binding, through
2194 being completed or through attributes being added. If we
2195 encounter multiple such decls, only the first should have
2196 its type saved; the others will already have had their
2197 proper types saved and the types will not have changed as
2198 their scopes will not have been re-entered. */
2199 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2201 b->type = TREE_TYPE (b->decl);
2204 if (B_IN_FILE_SCOPE (b)
2205 && TREE_CODE (b->decl) == VAR_DECL
2206 && TREE_STATIC (b->decl)
2207 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2208 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2209 && TREE_CODE (type) == ARRAY_TYPE
2210 && TYPE_DOMAIN (type)
2211 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2212 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2214 /* Array type completed in inner scope, which should be
2215 diagnosed if the completion does not have size 1 and
2216 it does not get completed in the file scope. */
2217 b->inner_comp = true;
2222 /* If a matching external declaration has been found, set its
2223 type to the composite of all the types of that declaration.
2224 After the consistency checks, it will be reset to the
2225 composite of the visible types only. */
2226 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2228 TREE_TYPE (b->decl) = b->type;
2230 /* The point of the same_translation_unit_p check here is,
2231 we want to detect a duplicate decl for a construct like
2232 foo() { extern bar(); } ... static bar(); but not if
2233 they are in different translation units. In any case,
2234 the static does not go in the externals scope. */
2236 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2237 && duplicate_decls (x, b->decl))
2242 if (comptypes (vistype, type))
2243 thistype = composite_type (vistype, type);
2245 thistype = TREE_TYPE (b->decl);
2249 b->type = TREE_TYPE (b->decl);
2250 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2252 = build_type_attribute_variant (thistype,
2253 TYPE_ATTRIBUTES (b->type));
2254 TREE_TYPE (b->decl) = thistype;
2255 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2258 else if (TREE_PUBLIC (x))
2260 if (visdecl && !b && duplicate_decls (x, visdecl))
2262 /* An external declaration at block scope referring to a
2263 visible entity with internal linkage. The composite
2264 type will already be correct for this scope, so we
2265 just need to fall through to make the declaration in
2272 bind (name, x, external_scope, /*invisible=*/true,
2279 if (TREE_CODE (x) != PARM_DECL)
2280 warn_if_shadowing (x);
2282 skip_external_and_shadow_checks:
2283 if (TREE_CODE (x) == TYPE_DECL)
2284 clone_underlying_type (x);
2286 bind (name, x, scope, /*invisible=*/false, nested);
2288 /* If x's type is incomplete because it's based on a
2289 structure or union which has not yet been fully declared,
2290 attach it to that structure or union type, so we can go
2291 back and complete the variable declaration later, if the
2292 structure or union gets fully declared.
2294 If the input is erroneous, we can have error_mark in the type
2295 slot (e.g. "f(void a, ...)") - that doesn't count as an
2297 if (TREE_TYPE (x) != error_mark_node
2298 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2300 tree element = TREE_TYPE (x);
2302 while (TREE_CODE (element) == ARRAY_TYPE)
2303 element = TREE_TYPE (element);
2304 element = TYPE_MAIN_VARIANT (element);
2306 if ((TREE_CODE (element) == RECORD_TYPE
2307 || TREE_CODE (element) == UNION_TYPE)
2308 && (TREE_CODE (x) != TYPE_DECL
2309 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2310 && !COMPLETE_TYPE_P (element))
2311 C_TYPE_INCOMPLETE_VARS (element)
2312 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2317 /* Record X as belonging to file scope.
2318 This is used only internally by the Objective-C front end,
2319 and is limited to its needs. duplicate_decls is not called;
2320 if there is any preexisting decl for this identifier, it is an ICE. */
2323 pushdecl_top_level (tree x)
2326 bool nested = false;
2327 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2329 name = DECL_NAME (x);
2331 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2333 if (TREE_PUBLIC (x))
2335 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2339 bind (name, x, file_scope, /*invisible=*/false, nested);
2345 implicit_decl_warning (tree id, tree olddecl)
2347 void (*diag) (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
2348 switch (mesg_implicit_function_declaration)
2351 case 1: diag = warning0; break;
2352 case 2: diag = error; break;
2353 default: gcc_unreachable ();
2356 diag (G_("implicit declaration of function %qE"), id);
2358 locate_old_decl (olddecl, diag);
2361 /* Generate an implicit declaration for identifier FUNCTIONID as a
2362 function of type int (). */
2365 implicitly_declare (tree functionid)
2367 struct c_binding *b;
2371 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2373 if (B_IN_SCOPE (b, external_scope))
2382 if (decl == error_mark_node)
2385 /* FIXME: Objective-C has weird not-really-builtin functions
2386 which are supposed to be visible automatically. They wind up
2387 in the external scope because they're pushed before the file
2388 scope gets created. Catch this here and rebind them into the
2390 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2392 bind (functionid, decl, file_scope,
2393 /*invisible=*/false, /*nested=*/true);
2398 tree newtype = default_function_type;
2400 TREE_TYPE (decl) = b->type;
2401 /* Implicit declaration of a function already declared
2402 (somehow) in a different scope, or as a built-in.
2403 If this is the first time this has happened, warn;
2404 then recycle the old declaration but with the new type. */
2405 if (!C_DECL_IMPLICIT (decl))
2407 implicit_decl_warning (functionid, decl);
2408 C_DECL_IMPLICIT (decl) = 1;
2410 if (DECL_BUILT_IN (decl))
2412 newtype = build_type_attribute_variant (newtype,
2414 (TREE_TYPE (decl)));
2415 if (!comptypes (newtype, TREE_TYPE (decl)))
2417 warning (0, "incompatible implicit declaration of built-in"
2418 " function %qD", decl);
2419 newtype = TREE_TYPE (decl);
2424 if (!comptypes (newtype, TREE_TYPE (decl)))
2426 error ("incompatible implicit declaration of function %qD",
2428 locate_old_decl (decl, error);
2431 b->type = TREE_TYPE (decl);
2432 TREE_TYPE (decl) = newtype;
2433 bind (functionid, decl, current_scope,
2434 /*invisible=*/false, /*nested=*/true);
2439 /* Not seen before. */
2440 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2441 DECL_EXTERNAL (decl) = 1;
2442 TREE_PUBLIC (decl) = 1;
2443 C_DECL_IMPLICIT (decl) = 1;
2444 implicit_decl_warning (functionid, 0);
2445 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2447 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2449 /* C89 says implicit declarations are in the innermost block.
2450 So we record the decl in the standard fashion. */
2451 decl = pushdecl (decl);
2453 /* No need to call objc_check_decl here - it's a function type. */
2454 rest_of_decl_compilation (decl, 0, 0);
2456 /* Write a record describing this implicit function declaration
2457 to the prototypes file (if requested). */
2458 gen_aux_info_record (decl, 0, 1, 0);
2460 /* Possibly apply some default attributes to this implicit declaration. */
2461 decl_attributes (&decl, NULL_TREE, 0);
2466 /* Issue an error message for a reference to an undeclared variable
2467 ID, including a reference to a builtin outside of function-call
2468 context. Establish a binding of the identifier to error_mark_node
2469 in an appropriate scope, which will suppress further errors for the
2470 same identifier. The error message should be given location LOC. */
2472 undeclared_variable (tree id, location_t loc)
2474 static bool already = false;
2475 struct c_scope *scope;
2477 if (current_function_decl == 0)
2479 error ("%H%qE undeclared here (not in a function)", &loc, id);
2480 scope = current_scope;
2484 error ("%H%qE undeclared (first use in this function)", &loc, id);
2488 error ("%H(Each undeclared identifier is reported only once", &loc);
2489 error ("%Hfor each function it appears in.)", &loc);
2493 /* If we are parsing old-style parameter decls, current_function_decl
2494 will be nonnull but current_function_scope will be null. */
2495 scope = current_function_scope ? current_function_scope : current_scope;
2497 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2500 /* Subroutine of lookup_label, declare_label, define_label: construct a
2501 LABEL_DECL with all the proper frills. */
2504 make_label (tree name, location_t location)
2506 tree label = build_decl (LABEL_DECL, name, void_type_node);
2508 DECL_CONTEXT (label) = current_function_decl;
2509 DECL_MODE (label) = VOIDmode;
2510 DECL_SOURCE_LOCATION (label) = location;
2515 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2516 Create one if none exists so far for the current function.
2517 This is called when a label is used in a goto expression or
2518 has its address taken. */
2521 lookup_label (tree name)
2525 if (current_function_decl == 0)
2527 error ("label %qE referenced outside of any function", name);
2531 /* Use a label already defined or ref'd with this name, but not if
2532 it is inherited from a containing function and wasn't declared
2534 label = I_LABEL_DECL (name);
2535 if (label && (DECL_CONTEXT (label) == current_function_decl
2536 || C_DECLARED_LABEL_FLAG (label)))
2538 /* If the label has only been declared, update its apparent
2539 location to point here, for better diagnostics if it
2540 turns out not to have been defined. */
2541 if (!TREE_USED (label))
2542 DECL_SOURCE_LOCATION (label) = input_location;
2546 /* No label binding for that identifier; make one. */
2547 label = make_label (name, input_location);
2549 /* Ordinary labels go in the current function scope. */
2550 bind (name, label, current_function_scope,
2551 /*invisible=*/false, /*nested=*/false);
2555 /* Make a label named NAME in the current function, shadowing silently
2556 any that may be inherited from containing functions or containing
2557 scopes. This is called for __label__ declarations. */
2560 declare_label (tree name)
2562 struct c_binding *b = I_LABEL_BINDING (name);
2565 /* Check to make sure that the label hasn't already been declared
2567 if (b && B_IN_CURRENT_SCOPE (b))
2569 error ("duplicate label declaration %qE", name);
2570 locate_old_decl (b->decl, error);
2572 /* Just use the previous declaration. */
2576 label = make_label (name, input_location);
2577 C_DECLARED_LABEL_FLAG (label) = 1;
2579 /* Declared labels go in the current scope. */
2580 bind (name, label, current_scope,
2581 /*invisible=*/false, /*nested=*/false);
2585 /* Define a label, specifying the location in the source file.
2586 Return the LABEL_DECL node for the label, if the definition is valid.
2587 Otherwise return 0. */
2590 define_label (location_t location, tree name)
2592 /* Find any preexisting label with this name. It is an error
2593 if that label has already been defined in this function, or
2594 if there is a containing function with a declared label with
2596 tree label = I_LABEL_DECL (name);
2597 struct c_label_list *nlist_se, *nlist_vm;
2600 && ((DECL_CONTEXT (label) == current_function_decl
2601 && DECL_INITIAL (label) != 0)
2602 || (DECL_CONTEXT (label) != current_function_decl
2603 && C_DECLARED_LABEL_FLAG (label))))
2605 error ("%Hduplicate label %qD", &location, label);
2606 locate_old_decl (label, error);
2609 else if (label && DECL_CONTEXT (label) == current_function_decl)
2611 /* The label has been used or declared already in this function,
2612 but not defined. Update its location to point to this
2614 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2615 error ("%Jjump into statement expression", label);
2616 if (C_DECL_UNDEFINABLE_VM (label))
2617 error ("%Jjump into scope of identifier with variably modified type",
2619 DECL_SOURCE_LOCATION (label) = location;
2623 /* No label binding for that identifier; make one. */
2624 label = make_label (name, location);
2626 /* Ordinary labels go in the current function scope. */
2627 bind (name, label, current_function_scope,
2628 /*invisible=*/false, /*nested=*/false);
2631 if (!in_system_header && lookup_name (name))
2632 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2633 "for labels, identifier %qE conflicts", &location, name);
2635 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2636 nlist_se->next = label_context_stack_se->labels_def;
2637 nlist_se->label = label;
2638 label_context_stack_se->labels_def = nlist_se;
2640 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2641 nlist_vm->next = label_context_stack_vm->labels_def;
2642 nlist_vm->label = label;
2643 label_context_stack_vm->labels_def = nlist_vm;
2645 /* Mark label as having been defined. */
2646 DECL_INITIAL (label) = error_mark_node;
2650 /* Given NAME, an IDENTIFIER_NODE,
2651 return the structure (or union or enum) definition for that name.
2652 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2653 CODE says which kind of type the caller wants;
2654 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2655 If the wrong kind of type is found, an error is reported. */
2658 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2660 struct c_binding *b = I_TAG_BINDING (name);
2666 /* We only care about whether it's in this level if
2667 thislevel_only was set or it might be a type clash. */
2668 if (thislevel_only || TREE_CODE (b->decl) != code)
2670 /* For our purposes, a tag in the external scope is the same as
2671 a tag in the file scope. (Primarily relevant to Objective-C
2672 and its builtin structure tags, which get pushed before the
2673 file scope is created.) */
2674 if (B_IN_CURRENT_SCOPE (b)
2675 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2679 if (thislevel_only && !thislevel)
2682 if (TREE_CODE (b->decl) != code)
2684 /* Definition isn't the kind we were looking for. */
2685 pending_invalid_xref = name;
2686 pending_invalid_xref_location = input_location;
2688 /* If in the same binding level as a declaration as a tag
2689 of a different type, this must not be allowed to
2690 shadow that tag, so give the error immediately.
2691 (For example, "struct foo; union foo;" is invalid.) */
2693 pending_xref_error ();
2698 /* Print an error message now
2699 for a recent invalid struct, union or enum cross reference.
2700 We don't print them immediately because they are not invalid
2701 when used in the `struct foo;' construct for shadowing. */
2704 pending_xref_error (void)
2706 if (pending_invalid_xref != 0)
2707 error ("%H%qE defined as wrong kind of tag",
2708 &pending_invalid_xref_location, pending_invalid_xref);
2709 pending_invalid_xref = 0;
2713 /* Look up NAME in the current scope and its superiors
2714 in the namespace of variables, functions and typedefs.
2715 Return a ..._DECL node of some kind representing its definition,
2716 or return 0 if it is undefined. */
2719 lookup_name (tree name)
2721 struct c_binding *b = I_SYMBOL_BINDING (name);
2722 if (b && !b->invisible)
2727 /* Similar to `lookup_name' but look only at the indicated scope. */
2730 lookup_name_in_scope (tree name, struct c_scope *scope)
2732 struct c_binding *b;
2734 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2735 if (B_IN_SCOPE (b, scope))
2740 /* Create the predefined scalar types of C,
2741 and some nodes representing standard constants (0, 1, (void *) 0).
2742 Initialize the global scope.
2743 Make definitions for built-in primitive functions. */
2746 c_init_decl_processing (void)
2748 location_t save_loc = input_location;
2750 /* Initialize reserved words for parser. */
2753 current_function_decl = 0;
2755 gcc_obstack_init (&parser_obstack);
2757 /* Make the externals scope. */
2759 external_scope = current_scope;
2761 /* Declarations from c_common_nodes_and_builtins must not be associated
2762 with this input file, lest we get differences between using and not
2763 using preprocessed headers. */
2764 #ifdef USE_MAPPED_LOCATION
2765 input_location = BUILTINS_LOCATION;
2767 input_location.file = "<built-in>";
2768 input_location.line = 0;
2771 build_common_tree_nodes (flag_signed_char, false);
2773 c_common_nodes_and_builtins ();
2775 /* In C, comparisons and TRUTH_* expressions have type int. */
2776 truthvalue_type_node = integer_type_node;
2777 truthvalue_true_node = integer_one_node;
2778 truthvalue_false_node = integer_zero_node;
2780 /* Even in C99, which has a real boolean type. */
2781 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2782 boolean_type_node));
2784 input_location = save_loc;
2786 pedantic_lvalues = true;
2788 make_fname_decl = c_make_fname_decl;
2789 start_fname_decls ();
2792 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2793 decl, NAME is the initialization string and TYPE_DEP indicates whether
2794 NAME depended on the type of the function. As we don't yet implement
2795 delayed emission of static data, we mark the decl as emitted
2796 so it is not placed in the output. Anything using it must therefore pull
2797 out the STRING_CST initializer directly. FIXME. */
2800 c_make_fname_decl (tree id, int type_dep)
2802 const char *name = fname_as_string (type_dep);
2803 tree decl, type, init;
2804 size_t length = strlen (name);
2806 type = build_array_type (char_type_node,
2807 build_index_type (size_int (length)));
2808 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2810 decl = build_decl (VAR_DECL, id, type);
2812 TREE_STATIC (decl) = 1;
2813 TREE_READONLY (decl) = 1;
2814 DECL_ARTIFICIAL (decl) = 1;
2816 init = build_string (length + 1, name);
2817 free ((char *) name);
2818 TREE_TYPE (init) = type;
2819 DECL_INITIAL (decl) = init;
2821 TREE_USED (decl) = 1;
2823 if (current_function_decl
2824 /* For invalid programs like this:
2827 const char* p = __FUNCTION__;
2829 the __FUNCTION__ is believed to appear in K&R style function
2830 parameter declarator. In that case we still don't have
2832 && (!errorcount || current_function_scope))
2834 DECL_CONTEXT (decl) = current_function_decl;
2835 bind (id, decl, current_function_scope,
2836 /*invisible=*/false, /*nested=*/false);
2839 finish_decl (decl, init, NULL_TREE);
2845 c_builtin_function (tree decl)
2847 tree type = TREE_TYPE (decl);
2848 tree id = DECL_NAME (decl);
2850 const char *name = IDENTIFIER_POINTER (id);
2851 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2852 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2854 /* Should never be called on a symbol with a preexisting meaning. */
2855 gcc_assert (!I_SYMBOL_BINDING (id));
2857 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2859 /* Builtins in the implementation namespace are made visible without
2860 needing to be explicitly declared. See push_file_scope. */
2861 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2863 TREE_CHAIN (decl) = visible_builtins;
2864 visible_builtins = decl;
2870 /* Called when a declaration is seen that contains no names to declare.
2871 If its type is a reference to a structure, union or enum inherited
2872 from a containing scope, shadow that tag name for the current scope
2873 with a forward reference.
2874 If its type defines a new named structure or union
2875 or defines an enum, it is valid but we need not do anything here.
2876 Otherwise, it is an error. */
2879 shadow_tag (const struct c_declspecs *declspecs)
2881 shadow_tag_warned (declspecs, 0);
2884 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2887 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2889 bool found_tag = false;
2891 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2893 tree value = declspecs->type;
2894 enum tree_code code = TREE_CODE (value);
2896 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2897 /* Used to test also that TYPE_SIZE (value) != 0.
2898 That caused warning for `struct foo;' at top level in the file. */
2900 tree name = TYPE_NAME (value);
2907 if (warned != 1 && code != ENUMERAL_TYPE)
2908 /* Empty unnamed enum OK */
2910 pedwarn ("unnamed struct/union that defines no instances");
2914 else if (!declspecs->tag_defined_p
2915 && declspecs->storage_class != csc_none)
2918 pedwarn ("empty declaration with storage class specifier "
2919 "does not redeclare tag");
2921 pending_xref_error ();
2923 else if (!declspecs->tag_defined_p
2924 && (declspecs->const_p
2925 || declspecs->volatile_p
2926 || declspecs->restrict_p))
2929 pedwarn ("empty declaration with type qualifier "
2930 "does not redeclare tag");
2932 pending_xref_error ();
2936 pending_invalid_xref = 0;
2937 t = lookup_tag (code, name, 1);
2941 t = make_node (code);
2948 if (warned != 1 && !in_system_header)
2950 pedwarn ("useless type name in empty declaration");
2955 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2957 pedwarn ("useless type name in empty declaration");
2961 pending_invalid_xref = 0;
2963 if (declspecs->inline_p)
2965 error ("%<inline%> in empty declaration");
2969 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2971 error ("%<auto%> in file-scope empty declaration");
2975 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2977 error ("%<register%> in file-scope empty declaration");
2981 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2983 warning (0, "useless storage class specifier in empty declaration");
2987 if (!warned && !in_system_header && declspecs->thread_p)
2989 warning (0, "useless %<__thread%> in empty declaration");
2993 if (!warned && !in_system_header && (declspecs->const_p
2994 || declspecs->volatile_p
2995 || declspecs->restrict_p))
2997 warning (0, "useless type qualifier in empty declaration");
3004 pedwarn ("empty declaration");
3009 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3010 bits. SPECS represents declaration specifiers that the grammar
3011 only permits to contain type qualifiers and attributes. */
3014 quals_from_declspecs (const struct c_declspecs *specs)
3016 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3017 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3018 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
3019 gcc_assert (!specs->type
3020 && !specs->decl_attr
3021 && specs->typespec_word == cts_none
3022 && specs->storage_class == csc_none
3023 && !specs->typedef_p
3024 && !specs->explicit_signed_p
3025 && !specs->deprecated_p
3027 && !specs->long_long_p
3030 && !specs->unsigned_p
3031 && !specs->complex_p
3033 && !specs->thread_p);
3037 /* Construct an array declarator. EXPR is the expression inside [],
3038 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3039 applied to the pointer to which a parameter array is converted).
3040 STATIC_P is true if "static" is inside the [], false otherwise.
3041 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3042 length which is nevertheless a complete type, false otherwise. The
3043 field for the contained declarator is left to be filled in by
3044 set_array_declarator_inner. */
3046 struct c_declarator *
3047 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3050 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3051 struct c_declarator);
3052 declarator->kind = cdk_array;
3053 declarator->declarator = 0;
3054 declarator->u.array.dimen = expr;
3057 declarator->u.array.attrs = quals->attrs;
3058 declarator->u.array.quals = quals_from_declspecs (quals);
3062 declarator->u.array.attrs = NULL_TREE;
3063 declarator->u.array.quals = 0;
3065 declarator->u.array.static_p = static_p;
3066 declarator->u.array.vla_unspec_p = vla_unspec_p;
3067 if (pedantic && !flag_isoc99)
3069 if (static_p || quals != NULL)
3070 pedwarn ("ISO C90 does not support %<static%> or type "
3071 "qualifiers in parameter array declarators");
3073 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3077 if (!current_scope->parm_flag)
3080 error ("%<[*]%> not allowed in other than function prototype scope");
3081 declarator->u.array.vla_unspec_p = false;
3084 current_scope->had_vla_unspec = true;
3089 /* Set the contained declarator of an array declarator. DECL is the
3090 declarator, as constructed by build_array_declarator; INNER is what
3091 appears on the left of the []. ABSTRACT_P is true if it is an
3092 abstract declarator, false otherwise; this is used to reject static
3093 and type qualifiers in abstract declarators, where they are not in
3094 the C99 grammar (subject to possible change in DR#289). */
3096 struct c_declarator *
3097 set_array_declarator_inner (struct c_declarator *decl,
3098 struct c_declarator *inner, bool abstract_p)
3100 decl->declarator = inner;
3101 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
3102 || decl->u.array.attrs != NULL_TREE
3103 || decl->u.array.static_p))
3104 error ("static or type qualifiers in abstract declarator");
3108 /* INIT is a constructor that forms DECL's initializer. If the final
3109 element initializes a flexible array field, add the size of that
3110 initializer to DECL's size. */
3113 add_flexible_array_elts_to_size (tree decl, tree init)
3117 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3120 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3121 type = TREE_TYPE (elt);
3122 if (TREE_CODE (type) == ARRAY_TYPE
3123 && TYPE_SIZE (type) == NULL_TREE
3124 && TYPE_DOMAIN (type) != NULL_TREE
3125 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3127 complete_array_type (&type, elt, false);
3129 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3130 DECL_SIZE_UNIT (decl)
3131 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3135 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3138 groktypename (struct c_type_name *type_name)
3141 tree attrs = type_name->specs->attrs;
3143 type_name->specs->attrs = NULL_TREE;
3145 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3148 /* Apply attributes. */
3149 decl_attributes (&type, attrs, 0);
3154 /* Decode a declarator in an ordinary declaration or data definition.
3155 This is called as soon as the type information and variable name
3156 have been parsed, before parsing the initializer if any.
3157 Here we create the ..._DECL node, fill in its type,
3158 and put it on the list of decls for the current context.
3159 The ..._DECL node is returned as the value.
3161 Exception: for arrays where the length is not specified,
3162 the type is left null, to be filled in by `finish_decl'.
3164 Function definitions do not come here; they go to start_function
3165 instead. However, external and forward declarations of functions
3166 do go through here. Structure field declarations are done by
3167 grokfield and not through here. */
3170 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3171 bool initialized, tree attributes)
3176 /* An object declared as __attribute__((deprecated)) suppresses
3177 warnings of uses of other deprecated items. */
3178 if (lookup_attribute ("deprecated", attributes))
3179 deprecated_state = DEPRECATED_SUPPRESS;
3181 decl = grokdeclarator (declarator, declspecs,
3182 NORMAL, initialized, NULL);
3186 deprecated_state = DEPRECATED_NORMAL;
3188 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3189 && MAIN_NAME_P (DECL_NAME (decl)))
3190 warning (OPT_Wmain, "%q+D is usually a function", decl);
3193 /* Is it valid for this decl to have an initializer at all?
3194 If not, set INITIALIZED to zero, which will indirectly
3195 tell 'finish_decl' to ignore the initializer once it is parsed. */
3196 switch (TREE_CODE (decl))
3199 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3204 error ("function %qD is initialized like a variable", decl);
3209 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3210 error ("parameter %qD is initialized", decl);
3215 /* Don't allow initializations for incomplete types except for
3216 arrays which might be completed by the initialization. */
3218 /* This can happen if the array size is an undefined macro.
3219 We already gave a warning, so we don't need another one. */
3220 if (TREE_TYPE (decl) == error_mark_node)
3222 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3224 /* A complete type is ok if size is fixed. */
3226 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3227 || C_DECL_VARIABLE_SIZE (decl))
3229 error ("variable-sized object may not be initialized");
3233 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3235 error ("variable %qD has initializer but incomplete type", decl);
3238 else if (C_DECL_VARIABLE_SIZE (decl))
3240 /* Although C99 is unclear about whether incomplete arrays
3241 of VLAs themselves count as VLAs, it does not make
3242 sense to permit them to be initialized given that
3243 ordinary VLAs may not be initialized. */
3244 error ("variable-sized object may not be initialized");
3251 if (current_scope == file_scope)
3252 TREE_STATIC (decl) = 1;
3254 /* Tell 'pushdecl' this is an initialized decl
3255 even though we don't yet have the initializer expression.
3256 Also tell 'finish_decl' it may store the real initializer. */
3257 DECL_INITIAL (decl) = error_mark_node;
3260 /* If this is a function declaration, write a record describing it to the
3261 prototypes file (if requested). */
3263 if (TREE_CODE (decl) == FUNCTION_DECL)
3264 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3266 /* ANSI specifies that a tentative definition which is not merged with
3267 a non-tentative definition behaves exactly like a definition with an
3268 initializer equal to zero. (Section 3.7.2)
3270 -fno-common gives strict ANSI behavior, though this tends to break
3271 a large body of code that grew up without this rule.
3273 Thread-local variables are never common, since there's no entrenched
3274 body of code to break, and it allows more efficient variable references
3275 in the presence of dynamic linking. */
3277 if (TREE_CODE (decl) == VAR_DECL
3279 && TREE_PUBLIC (decl)
3280 && !DECL_THREAD_LOCAL_P (decl)
3282 DECL_COMMON (decl) = 1;
3284 /* Set attributes here so if duplicate decl, will have proper attributes. */
3285 decl_attributes (&decl, attributes, 0);
3287 if (TREE_CODE (decl) == FUNCTION_DECL
3288 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3290 struct c_declarator *ce = declarator;
3292 if (ce->kind == cdk_pointer)
3293 ce = declarator->declarator;
3294 if (ce->kind == cdk_function)
3296 tree args = ce->u.arg_info->parms;
3297 for (; args; args = TREE_CHAIN (args))
3299 tree type = TREE_TYPE (args);
3300 if (type && INTEGRAL_TYPE_P (type)
3301 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3302 DECL_ARG_TYPE (args) = integer_type_node;
3307 if (TREE_CODE (decl) == FUNCTION_DECL
3308 && DECL_DECLARED_INLINE_P (decl)
3309 && DECL_UNINLINABLE (decl)
3310 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3311 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3314 /* C99 6.7.4p3: An inline definition of a function with external
3315 linkage shall not contain a definition of a modifiable object
3316 with static storage duration... */
3317 if (TREE_CODE (decl) == VAR_DECL
3318 && current_scope != file_scope
3319 && TREE_STATIC (decl)
3320 && DECL_DECLARED_INLINE_P (current_function_decl)
3321 && DECL_EXTERNAL (current_function_decl))
3322 pedwarn ("%q+D is static but declared in inline function %qD "
3323 "which is not static", decl, current_function_decl);
3325 /* Add this decl to the current scope.
3326 TEM may equal DECL or it may be a previous decl of the same name. */
3327 tem = pushdecl (decl);
3329 if (initialized && DECL_EXTERNAL (tem))
3331 DECL_EXTERNAL (tem) = 0;
3332 TREE_STATIC (tem) = 1;
3338 /* Finish processing of a declaration;
3339 install its initial value.
3340 If the length of an array type is not known before,
3341 it must be determined now, from the initial value, or it is an error. */
3344 finish_decl (tree decl, tree init, tree asmspec_tree)
3346 tree type = TREE_TYPE (decl);
3347 int was_incomplete = (DECL_SIZE (decl) == 0);
3348 const char *asmspec = 0;
3350 /* If a name was specified, get the string. */
3351 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3352 && DECL_FILE_SCOPE_P (decl))
3353 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3355 asmspec = TREE_STRING_POINTER (asmspec_tree);
3357 /* If `start_decl' didn't like having an initialization, ignore it now. */
3358 if (init != 0 && DECL_INITIAL (decl) == 0)
3361 /* Don't crash if parm is initialized. */
3362 if (TREE_CODE (decl) == PARM_DECL)
3366 store_init_value (decl, init);
3368 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3369 || TREE_CODE (decl) == FUNCTION_DECL
3370 || TREE_CODE (decl) == FIELD_DECL))
3371 objc_check_decl (decl);
3373 /* Deduce size of array from initialization, if not already known. */
3374 if (TREE_CODE (type) == ARRAY_TYPE
3375 && TYPE_DOMAIN (type) == 0
3376 && TREE_CODE (decl) != TYPE_DECL)
3379 = (TREE_STATIC (decl)
3380 /* Even if pedantic, an external linkage array
3381 may have incomplete type at first. */
3382 ? pedantic && !TREE_PUBLIC (decl)
3383 : !DECL_EXTERNAL (decl));
3385 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3388 /* Get the completed type made by complete_array_type. */
3389 type = TREE_TYPE (decl);
3394 error ("initializer fails to determine size of %q+D", decl);
3399 error ("array size missing in %q+D", decl);
3400 /* If a `static' var's size isn't known,
3401 make it extern as well as static, so it does not get
3403 If it is not `static', then do not mark extern;
3404 finish_incomplete_decl will give it a default size
3405 and it will get allocated. */
3406 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3407 DECL_EXTERNAL (decl) = 1;
3411 error ("zero or negative size array %q+D", decl);
3415 /* For global variables, update the copy of the type that
3416 exists in the binding. */
3417 if (TREE_PUBLIC (decl))
3419 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3420 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3421 b_ext = b_ext->shadowed;
3425 b_ext->type = composite_type (b_ext->type, type);
3436 if (DECL_INITIAL (decl))
3437 TREE_TYPE (DECL_INITIAL (decl)) = type;
3439 layout_decl (decl, 0);
3442 if (TREE_CODE (decl) == VAR_DECL)
3444 if (init && TREE_CODE (init) == CONSTRUCTOR)
3445 add_flexible_array_elts_to_size (decl, init);
3447 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3448 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3449 layout_decl (decl, 0);
3451 if (DECL_SIZE (decl) == 0
3452 /* Don't give an error if we already gave one earlier. */
3453 && TREE_TYPE (decl) != error_mark_node
3454 && (TREE_STATIC (decl)
3455 /* A static variable with an incomplete type
3456 is an error if it is initialized.
3457 Also if it is not file scope.
3458 Otherwise, let it through, but if it is not `extern'
3459 then it may cause an error message later. */
3460 ? (DECL_INITIAL (decl) != 0
3461 || !DECL_FILE_SCOPE_P (decl))
3462 /* An automatic variable with an incomplete type
3464 : !DECL_EXTERNAL (decl)))
3466 error ("storage size of %q+D isn%'t known", decl);
3467 TREE_TYPE (decl) = error_mark_node;
3470 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3471 && DECL_SIZE (decl) != 0)
3473 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3474 constant_expression_warning (DECL_SIZE (decl));
3476 error ("storage size of %q+D isn%'t constant", decl);
3479 if (TREE_USED (type))
3480 TREE_USED (decl) = 1;
3483 /* If this is a function and an assembler name is specified, reset DECL_RTL
3484 so we can give it its new name. Also, update built_in_decls if it
3485 was a normal built-in. */
3486 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3488 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3489 set_builtin_user_assembler_name (decl, asmspec);
3490 set_user_assembler_name (decl, asmspec);
3493 /* If #pragma weak was used, mark the decl weak now. */
3494 maybe_apply_pragma_weak (decl);
3496 /* Output the assembler code and/or RTL code for variables and functions,
3497 unless the type is an undefined structure or union.
3498 If not, it will get done when the type is completed. */
3500 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3502 /* Determine the ELF visibility. */
3503 if (TREE_PUBLIC (decl))
3504 c_determine_visibility (decl);
3506 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3507 if (c_dialect_objc ())
3508 objc_check_decl (decl);
3512 /* If this is not a static variable, issue a warning.
3513 It doesn't make any sense to give an ASMSPEC for an
3514 ordinary, non-register local variable. Historically,
3515 GCC has accepted -- but ignored -- the ASMSPEC in
3517 if (!DECL_FILE_SCOPE_P (decl)
3518 && TREE_CODE (decl) == VAR_DECL
3519 && !C_DECL_REGISTER (decl)
3520 && !TREE_STATIC (decl))
3521 warning (0, "ignoring asm-specifier for non-static local "
3522 "variable %q+D", decl);
3524 set_user_assembler_name (decl, asmspec);
3527 if (DECL_FILE_SCOPE_P (decl))
3529 if (DECL_INITIAL (decl) == NULL_TREE
3530 || DECL_INITIAL (decl) == error_mark_node)
3531 /* Don't output anything
3532 when a tentative file-scope definition is seen.
3533 But at end of compilation, do output code for them. */
3534 DECL_DEFER_OUTPUT (decl) = 1;
3535 rest_of_decl_compilation (decl, true, 0);
3539 /* In conjunction with an ASMSPEC, the `register'
3540 keyword indicates that we should place the variable
3541 in a particular register. */
3542 if (asmspec && C_DECL_REGISTER (decl))
3544 DECL_HARD_REGISTER (decl) = 1;
3545 /* This cannot be done for a structure with volatile
3546 fields, on which DECL_REGISTER will have been
3548 if (!DECL_REGISTER (decl))
3549 error ("cannot put object with volatile field into register");
3552 if (TREE_CODE (decl) != FUNCTION_DECL)
3554 /* If we're building a variable sized type, and we might be
3555 reachable other than via the top of the current binding
3556 level, then create a new BIND_EXPR so that we deallocate
3557 the object at the right time. */
3558 /* Note that DECL_SIZE can be null due to errors. */
3559 if (DECL_SIZE (decl)
3560 && !TREE_CONSTANT (DECL_SIZE (decl))
3561 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3564 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3565 TREE_SIDE_EFFECTS (bind) = 1;
3567 BIND_EXPR_BODY (bind) = push_stmt_list ();
3569 add_stmt (build_stmt (DECL_EXPR, decl));
3574 if (!DECL_FILE_SCOPE_P (decl))
3576 /* Recompute the RTL of a local array now
3577 if it used to be an incomplete type. */
3579 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3581 /* If we used it already as memory, it must stay in memory. */
3582 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3583 /* If it's still incomplete now, no init will save it. */
3584 if (DECL_SIZE (decl) == 0)
3585 DECL_INITIAL (decl) = 0;
3590 /* If this was marked 'used', be sure it will be output. */
3591 if (!flag_unit_at_a_time && lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3592 mark_decl_referenced (decl);
3594 if (TREE_CODE (decl) == TYPE_DECL)
3596 if (!DECL_FILE_SCOPE_P (decl)
3597 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3598 add_stmt (build_stmt (DECL_EXPR, decl));
3600 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3603 /* At the end of a declaration, throw away any variable type sizes
3604 of types defined inside that declaration. There is no use
3605 computing them in the following function definition. */
3606 if (current_scope == file_scope)
3607 get_pending_sizes ();
3609 /* Install a cleanup (aka destructor) if one was given. */
3610 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3612 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3615 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3616 tree cleanup_decl = lookup_name (cleanup_id);
3619 /* Build "cleanup(&decl)" for the destructor. */
3620 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3621 cleanup = build_tree_list (NULL_TREE, cleanup);
3622 cleanup = build_function_call (cleanup_decl, cleanup);
3624 /* Don't warn about decl unused; the cleanup uses it. */
3625 TREE_USED (decl) = 1;
3626 TREE_USED (cleanup_decl) = 1;
3628 /* Initialize EH, if we've been told to do so. */
3629 if (flag_exceptions && !c_eh_initialized_p)
3631 c_eh_initialized_p = true;
3632 eh_personality_libfunc
3633 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3634 ? "__gcc_personality_sj0"
3635 : "__gcc_personality_v0");
3636 default_init_unwind_resume_libfunc ();
3637 using_eh_for_cleanups ();
3640 push_cleanup (decl, cleanup, false);
3645 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3648 grokparm (const struct c_parm *parm)
3650 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3653 decl_attributes (&decl, parm->attrs, 0);
3658 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3659 and push that on the current scope. */
3662 push_parm_decl (const struct c_parm *parm)
3666 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3667 decl_attributes (&decl, parm->attrs, 0);
3669 decl = pushdecl (decl);
3671 finish_decl (decl, NULL_TREE, NULL_TREE);
3674 /* Mark all the parameter declarations to date as forward decls.
3675 Also diagnose use of this extension. */
3678 mark_forward_parm_decls (void)
3680 struct c_binding *b;
3682 if (pedantic && !current_scope->warned_forward_parm_decls)
3684 pedwarn ("ISO C forbids forward parameter declarations");
3685 current_scope->warned_forward_parm_decls = true;
3688 for (b = current_scope->bindings; b; b = b->prev)
3689 if (TREE_CODE (b->decl) == PARM_DECL)
3690 TREE_ASM_WRITTEN (b->decl) = 1;
3693 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3694 literal, which may be an incomplete array type completed by the
3695 initializer; INIT is a CONSTRUCTOR that initializes the compound
3699 build_compound_literal (tree type, tree init)
3701 /* We do not use start_decl here because we have a type, not a declarator;
3702 and do not use finish_decl because the decl should be stored inside
3703 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3708 if (type == error_mark_node)
3709 return error_mark_node;
3711 decl = build_decl (VAR_DECL, NULL_TREE, type);
3712 DECL_EXTERNAL (decl) = 0;
3713 TREE_PUBLIC (decl) = 0;
3714 TREE_STATIC (decl) = (current_scope == file_scope);
3715 DECL_CONTEXT (decl) = current_function_decl;
3716 TREE_USED (decl) = 1;
3717 TREE_TYPE (decl) = type;
3718 TREE_READONLY (decl) = TYPE_READONLY (type);
3719 store_init_value (decl, init);
3721 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3723 int failure = complete_array_type (&TREE_TYPE (decl),
3724 DECL_INITIAL (decl), true);
3725 gcc_assert (!failure);
3727 type = TREE_TYPE (decl);
3728 TREE_TYPE (DECL_INITIAL (decl)) = type;
3731 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3732 return error_mark_node;
3734 stmt = build_stmt (DECL_EXPR, decl);
3735 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3736 TREE_SIDE_EFFECTS (complit) = 1;
3738 layout_decl (decl, 0);
3740 if (TREE_STATIC (decl))
3742 /* This decl needs a name for the assembler output. */
3743 set_compound_literal_name (decl);
3744 DECL_DEFER_OUTPUT (decl) = 1;
3745 DECL_COMDAT (decl) = 1;
3746 DECL_ARTIFICIAL (decl) = 1;
3747 DECL_IGNORED_P (decl) = 1;
3749 rest_of_decl_compilation (decl, 1, 0);
3755 /* Determine whether TYPE is a structure with a flexible array member,
3756 or a union containing such a structure (possibly recursively). */
3759 flexible_array_type_p (tree type)
3762 switch (TREE_CODE (type))
3765 x = TYPE_FIELDS (type);
3768 while (TREE_CHAIN (x) != NULL_TREE)
3770 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3771 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3772 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3773 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3777 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3779 if (flexible_array_type_p (TREE_TYPE (x)))
3788 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3789 replacing with appropriate values if they are invalid. */
3791 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3794 unsigned int max_width;
3795 unsigned HOST_WIDE_INT w;
3796 const char *name = orig_name ? orig_name: _("<anonymous>");
3798 /* Detect and ignore out of range field width and process valid
3800 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3801 || TREE_CODE (*width) != INTEGER_CST)
3803 error ("bit-field %qs width not an integer constant", name);
3804 *width = integer_one_node;
3808 constant_expression_warning (*width);
3809 if (tree_int_cst_sgn (*width) < 0)
3811 error ("negative width in bit-field %qs", name);
3812 *width = integer_one_node;
3814 else if (integer_zerop (*width) && orig_name)
3816 error ("zero width for bit-field %qs", name);
3817 *width = integer_one_node;
3821 /* Detect invalid bit-field type. */
3822 if (TREE_CODE (*type) != INTEGER_TYPE
3823 && TREE_CODE (*type) != BOOLEAN_TYPE
3824 && TREE_CODE (*type) != ENUMERAL_TYPE)
3826 error ("bit-field %qs has invalid type", name);
3827 *type = unsigned_type_node;
3830 type_mv = TYPE_MAIN_VARIANT (*type);
3832 && !in_system_header
3833 && type_mv != integer_type_node
3834 && type_mv != unsigned_type_node
3835 && type_mv != boolean_type_node)
3836 pedwarn ("type of bit-field %qs is a GCC extension", name);
3838 if (type_mv == boolean_type_node)
3839 max_width = CHAR_TYPE_SIZE;
3841 max_width = TYPE_PRECISION (*type);
3843 if (0 < compare_tree_int (*width, max_width))
3845 error ("width of %qs exceeds its type", name);
3847 *width = build_int_cst (NULL_TREE, w);
3850 w = tree_low_cst (*width, 1);
3852 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3854 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3856 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3857 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3858 warning (0, "%qs is narrower than values of its type", name);
3863 /* Given declspecs and a declarator,
3864 determine the name and type of the object declared
3865 and construct a ..._DECL node for it.
3866 (In one case we can return a ..._TYPE node instead.
3867 For invalid input we sometimes return 0.)
3869 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3871 DECL_CONTEXT says which syntactic context this declaration is in:
3872 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3873 FUNCDEF for a function definition. Like NORMAL but a few different
3874 error messages in each case. Return value may be zero meaning
3875 this definition is too screwy to try to parse.
3876 PARM for a parameter declaration (either within a function prototype
3877 or before a function body). Make a PARM_DECL, or return void_type_node.
3878 TYPENAME if for a typename (in a cast or sizeof).
3879 Don't make a DECL node; just return the ..._TYPE node.
3880 FIELD for a struct or union field; make a FIELD_DECL.
3881 INITIALIZED is true if the decl has an initializer.
3882 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3883 representing the width of the bit-field.
3885 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3886 It may also be so in the PARM case, for a prototype where the
3887 argument type is specified but not the name.
3889 This function is where the complicated C meanings of `static'
3890 and `extern' are interpreted. */
3893 grokdeclarator (const struct c_declarator *declarator,
3894 struct c_declspecs *declspecs,
3895 enum decl_context decl_context, bool initialized, tree *width)
3897 tree type = declspecs->type;
3898 bool threadp = declspecs->thread_p;
3899 enum c_storage_class storage_class = declspecs->storage_class;
3903 int type_quals = TYPE_UNQUALIFIED;
3904 const char *name, *orig_name;
3905 tree typedef_type = 0;
3906 bool funcdef_flag = false;
3907 bool funcdef_syntax = false;
3908 int size_varies = 0;
3909 tree decl_attr = declspecs->decl_attr;
3910 int array_ptr_quals = TYPE_UNQUALIFIED;
3911 tree array_ptr_attrs = NULL_TREE;
3912 int array_parm_static = 0;
3913 bool array_parm_vla_unspec_p = false;
3914 tree returned_attrs = NULL_TREE;
3915 bool bitfield = width != NULL;
3917 struct c_arg_info *arg_info = 0;
3919 if (decl_context == FUNCDEF)
3920 funcdef_flag = true, decl_context = NORMAL;
3922 /* Look inside a declarator for the name being declared
3923 and get it as a string, for an error message. */
3925 const struct c_declarator *decl = declarator;
3934 funcdef_syntax = (decl->kind == cdk_function);
3935 decl = decl->declarator;
3939 decl = decl->declarator;
3944 name = IDENTIFIER_POINTER (decl->u.id);
3956 /* A function definition's declarator must have the form of
3957 a function declarator. */
3959 if (funcdef_flag && !funcdef_syntax)
3962 /* If this looks like a function definition, make it one,
3963 even if it occurs where parms are expected.
3964 Then store_parm_decls will reject it and not use it as a parm. */
3965 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3966 decl_context = PARM;
3968 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3969 warn_deprecated_use (declspecs->type);
3971 if ((decl_context == NORMAL || decl_context == FIELD)
3972 && current_scope == file_scope
3973 && variably_modified_type_p (type, NULL_TREE))
3975 error ("variably modified %qs at file scope", name);
3976 type = integer_type_node;
3979 typedef_type = type;
3980 size_varies = C_TYPE_VARIABLE_SIZE (type);
3982 /* Diagnose defaulting to "int". */
3984 if (declspecs->default_int_p && !in_system_header)
3986 /* Issue a warning if this is an ISO C 99 program or if
3987 -Wreturn-type and this is a function, or if -Wimplicit;
3988 prefer the former warning since it is more explicit. */
3989 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3991 warn_about_return_type = 1;
3992 else if (warn_implicit_int || flag_isoc99)
3993 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3996 /* Adjust the type if a bit-field is being declared,
3997 -funsigned-bitfields applied and the type is not explicitly
3999 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4000 && TREE_CODE (type) == INTEGER_TYPE)
4001 type = c_common_unsigned_type (type);
4003 /* Figure out the type qualifiers for the declaration. There are
4004 two ways a declaration can become qualified. One is something
4005 like `const int i' where the `const' is explicit. Another is
4006 something like `typedef const int CI; CI i' where the type of the
4007 declaration contains the `const'. A third possibility is that
4008 there is a type qualifier on the element type of a typedefed
4009 array type, in which case we should extract that qualifier so
4010 that c_apply_type_quals_to_decls receives the full list of
4011 qualifiers to work with (C90 is not entirely clear about whether
4012 duplicate qualifiers should be diagnosed in this case, but it
4013 seems most appropriate to do so). */
4014 element_type = strip_array_types (type);
4015 constp = declspecs->const_p + TYPE_READONLY (element_type);
4016 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4017 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4018 if (pedantic && !flag_isoc99)
4021 pedwarn ("duplicate %<const%>");
4023 pedwarn ("duplicate %<restrict%>");
4025 pedwarn ("duplicate %<volatile%>");
4027 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4028 type = TYPE_MAIN_VARIANT (type);
4029 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4030 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4031 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4033 /* Warn about storage classes that are invalid for certain
4034 kinds of declarations (parameters, typenames, etc.). */
4038 || storage_class == csc_auto
4039 || storage_class == csc_register
4040 || storage_class == csc_typedef))
4042 if (storage_class == csc_auto
4043 && (pedantic || current_scope == file_scope))
4044 pedwarn ("function definition declared %<auto%>");
4045 if (storage_class == csc_register)
4046 error ("function definition declared %<register%>");
4047 if (storage_class == csc_typedef)
4048 error ("function definition declared %<typedef%>");
4050 error ("function definition declared %<__thread%>");
4052 if (storage_class == csc_auto
4053 || storage_class == csc_register
4054 || storage_class == csc_typedef)
4055 storage_class = csc_none;
4057 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4059 if (decl_context == PARM && storage_class == csc_register)
4063 switch (decl_context)
4066 error ("storage class specified for structure field %qs",
4070 error ("storage class specified for parameter %qs", name);
4073 error ("storage class specified for typename");
4076 storage_class = csc_none;
4080 else if (storage_class == csc_extern
4084 /* 'extern' with initialization is invalid if not at file scope. */
4085 if (current_scope == file_scope)
4087 /* It is fine to have 'extern const' when compiling at C
4088 and C++ intersection. */
4089 if (!(warn_cxx_compat && constp))
4090 warning (0, "%qs initialized and declared %<extern%>", name);
4093 error ("%qs has both %<extern%> and initializer", name);
4095 else if (current_scope == file_scope)
4097 if (storage_class == csc_auto)
4098 error ("file-scope declaration of %qs specifies %<auto%>", name);
4099 if (pedantic && storage_class == csc_register)
4100 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
4104 if (storage_class == csc_extern && funcdef_flag)
4105 error ("nested function %qs declared %<extern%>", name);
4106 else if (threadp && storage_class == csc_none)
4108 error ("function-scope %qs implicitly auto and declared "
4115 /* Now figure out the structure of the declarator proper.
4116 Descend through it, creating more complex types, until we reach
4117 the declared identifier (or NULL_TREE, in an absolute declarator).
4118 At each stage we maintain an unqualified version of the type
4119 together with any qualifiers that should be applied to it with
4120 c_build_qualified_type; this way, array types including
4121 multidimensional array types are first built up in unqualified
4122 form and then the qualified form is created with
4123 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4125 while (declarator && declarator->kind != cdk_id)
4127 if (type == error_mark_node)
4129 declarator = declarator->declarator;
4133 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4134 a cdk_pointer (for *...),
4135 a cdk_function (for ...(...)),
4136 a cdk_attrs (for nested attributes),
4137 or a cdk_id (for the name being declared
4138 or the place in an absolute declarator
4139 where the name was omitted).
4140 For the last case, we have just exited the loop.
4142 At this point, TYPE is the type of elements of an array,
4143 or for a function to return, or for a pointer to point to.
4144 After this sequence of ifs, TYPE is the type of the
4145 array or function or pointer, and DECLARATOR has had its
4146 outermost layer removed. */
4148 if (array_ptr_quals != TYPE_UNQUALIFIED
4149 || array_ptr_attrs != NULL_TREE
4150 || array_parm_static)
4152 /* Only the innermost declarator (making a parameter be of
4153 array type which is converted to pointer type)
4154 may have static or type qualifiers. */
4155 error ("static or type qualifiers in non-parameter array declarator");
4156 array_ptr_quals = TYPE_UNQUALIFIED;
4157 array_ptr_attrs = NULL_TREE;
4158 array_parm_static = 0;
4161 switch (declarator->kind)
4165 /* A declarator with embedded attributes. */
4166 tree attrs = declarator->u.attrs;
4167 const struct c_declarator *inner_decl;
4169 declarator = declarator->declarator;
4170 inner_decl = declarator;
4171 while (inner_decl->kind == cdk_attrs)
4172 inner_decl = inner_decl->declarator;
4173 if (inner_decl->kind == cdk_id)
4174 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4175 else if (inner_decl->kind == cdk_function)
4176 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4177 else if (inner_decl->kind == cdk_array)
4178 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4179 returned_attrs = decl_attributes (&type,
4180 chainon (returned_attrs, attrs),
4186 tree itype = NULL_TREE;
4187 tree size = declarator->u.array.dimen;
4188 /* The index is a signed object `sizetype' bits wide. */
4189 tree index_type = c_common_signed_type (sizetype);
4191 array_ptr_quals = declarator->u.array.quals;
4192 array_ptr_attrs = declarator->u.array.attrs;
4193 array_parm_static = declarator->u.array.static_p;
4194 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
4196 declarator = declarator->declarator;
4198 /* Check for some types that there cannot be arrays of. */
4200 if (VOID_TYPE_P (type))
4202 error ("declaration of %qs as array of voids", name);
4203 type = error_mark_node;
4206 if (TREE_CODE (type) == FUNCTION_TYPE)
4208 error ("declaration of %qs as array of functions", name);
4209 type = error_mark_node;
4212 if (pedantic && !in_system_header && flexible_array_type_p (type))
4213 pedwarn ("invalid use of structure with flexible array member");
4215 if (size == error_mark_node)
4216 type = error_mark_node;
4218 if (type == error_mark_node)
4221 /* If size was specified, set ITYPE to a range-type for
4222 that size. Otherwise, ITYPE remains null. finish_decl
4223 may figure it out from an initial value. */
4227 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4229 STRIP_TYPE_NOPS (size);
4231 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4233 error ("size of array %qs has non-integer type", name);
4234 size = integer_one_node;
4237 if (pedantic && integer_zerop (size))
4238 pedwarn ("ISO C forbids zero-size array %qs", name);
4240 if (TREE_CODE (size) == INTEGER_CST)
4242 constant_expression_warning (size);
4243 if (tree_int_cst_sgn (size) < 0)
4245 error ("size of array %qs is negative", name);
4246 size = integer_one_node;
4249 else if ((decl_context == NORMAL || decl_context == FIELD)
4250 && current_scope == file_scope)
4252 error ("variably modified %qs at file scope", name);
4253 size = integer_one_node;
4257 /* Make sure the array size remains visibly
4258 nonconstant even if it is (eg) a const variable
4259 with known value. */
4262 if (!flag_isoc99 && pedantic)
4264 if (TREE_CONSTANT (size))
4265 pedwarn ("ISO C90 forbids array %qs whose size "
4266 "can%'t be evaluated",
4269 pedwarn ("ISO C90 forbids variable-size array %qs",
4274 if (integer_zerop (size))
4276 /* A zero-length array cannot be represented with
4277 an unsigned index type, which is what we'll
4278 get with build_index_type. Create an
4279 open-ended range instead. */
4280 itype = build_range_type (sizetype, size, NULL_TREE);
4284 /* Arrange for the SAVE_EXPR on the inside of the
4285 MINUS_EXPR, which allows the -1 to get folded
4286 with the +1 that happens when building TYPE_SIZE. */
4288 size = variable_size (size);
4290 /* Compute the maximum valid index, that is, size
4291 - 1. Do the calculation in index_type, so that
4292 if it is a variable the computations will be
4293 done in the proper mode. */
4294 itype = fold_build2 (MINUS_EXPR, index_type,
4295 convert (index_type, size),
4296 convert (index_type,
4299 /* If that overflowed, the array is too big. ???
4300 While a size of INT_MAX+1 technically shouldn't
4301 cause an overflow (because we subtract 1), the
4302 overflow is recorded during the conversion to
4303 index_type, before the subtraction. Handling
4304 this case seems like an unnecessary
4306 if (TREE_CODE (itype) == INTEGER_CST
4307 && TREE_OVERFLOW (itype))
4309 error ("size of array %qs is too large", name);
4310 type = error_mark_node;
4314 itype = build_index_type (itype);
4317 else if (decl_context == FIELD)
4319 if (pedantic && !flag_isoc99 && !in_system_header)
4320 pedwarn ("ISO C90 does not support flexible array members");
4322 /* ISO C99 Flexible array members are effectively
4323 identical to GCC's zero-length array extension. */
4324 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4326 else if (decl_context == PARM)
4328 if (array_parm_vla_unspec_p)
4333 error ("%<[*]%> not allowed in other than a declaration");
4336 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4340 else if (decl_context == TYPENAME)
4342 if (array_parm_vla_unspec_p)
4344 /* The error is printed elsewhere. We use this to
4345 avoid messing up with incomplete array types of
4346 the same type, that would otherwise be modified
4348 itype = build_range_type (sizetype, size_zero_node,
4353 /* Complain about arrays of incomplete types. */
4354 if (!COMPLETE_TYPE_P (type))
4356 error ("array type has incomplete element type");
4357 type = error_mark_node;
4360 /* When itype is NULL, a shared incomplete array type is
4361 returned for all array of a given type. Elsewhere we
4362 make sure we don't complete that type before copying
4363 it, but here we want to make sure we don't ever
4364 modify the shared type, so we gcc_assert (itype)
4366 type = build_array_type (type, itype);
4368 if (type != error_mark_node)
4372 /* It is ok to modify type here even if itype is
4373 NULL: if size_varies, we're in a
4374 multi-dimensional array and the inner type has
4375 variable size, so the enclosing shared array type
4377 if (size && TREE_CODE (size) == INTEGER_CST)
4379 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
4380 C_TYPE_VARIABLE_SIZE (type) = 1;
4383 /* The GCC extension for zero-length arrays differs from
4384 ISO flexible array members in that sizeof yields
4386 if (size && integer_zerop (size))
4389 TYPE_SIZE (type) = bitsize_zero_node;
4390 TYPE_SIZE_UNIT (type) = size_zero_node;
4392 if (array_parm_vla_unspec_p)
4395 /* The type is complete. C99 6.7.5.2p4 */
4396 TYPE_SIZE (type) = bitsize_zero_node;
4397 TYPE_SIZE_UNIT (type) = size_zero_node;
4401 if (decl_context != PARM
4402 && (array_ptr_quals != TYPE_UNQUALIFIED
4403 || array_ptr_attrs != NULL_TREE
4404 || array_parm_static))
4406 error ("static or type qualifiers in non-parameter array declarator");
4407 array_ptr_quals = TYPE_UNQUALIFIED;
4408 array_ptr_attrs = NULL_TREE;
4409 array_parm_static = 0;
4415 /* Say it's a definition only for the declarator closest
4416 to the identifier, apart possibly from some
4418 bool really_funcdef = false;
4422 const struct c_declarator *t = declarator->declarator;
4423 while (t->kind == cdk_attrs)
4425 really_funcdef = (t->kind == cdk_id);
4428 /* Declaring a function type. Make sure we have a valid
4429 type for the function to return. */
4430 if (type == error_mark_node)
4435 /* Warn about some types functions can't return. */
4436 if (TREE_CODE (type) == FUNCTION_TYPE)
4438 error ("%qs declared as function returning a function", name);
4439 type = integer_type_node;
4441 if (TREE_CODE (type) == ARRAY_TYPE)
4443 error ("%qs declared as function returning an array", name);
4444 type = integer_type_node;
4447 /* Construct the function type and go to the next
4448 inner layer of declarator. */
4449 arg_info = declarator->u.arg_info;
4450 arg_types = grokparms (arg_info, really_funcdef);
4452 put_pending_sizes (arg_info->pending_sizes);
4454 /* Type qualifiers before the return type of the function
4455 qualify the return type, not the function type. */
4458 /* Type qualifiers on a function return type are
4459 normally permitted by the standard but have no
4460 effect, so give a warning at -Wreturn-type.
4461 Qualifiers on a void return type are banned on
4462 function definitions in ISO C; GCC used to used
4463 them for noreturn functions. */
4464 if (VOID_TYPE_P (type) && really_funcdef)
4465 pedwarn ("function definition has qualified void return type");
4467 warning (OPT_Wreturn_type,
4468 "type qualifiers ignored on function return type");
4470 type = c_build_qualified_type (type, type_quals);
4472 type_quals = TYPE_UNQUALIFIED;
4474 type = build_function_type (type, arg_types);
4475 declarator = declarator->declarator;
4477 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4478 the formal parameter list of this FUNCTION_TYPE to point to
4479 the FUNCTION_TYPE node itself. */
4483 for (link = arg_info->tags;
4485 link = TREE_CHAIN (link))
4486 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4492 /* Merge any constancy or volatility into the target type
4495 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4497 pedwarn ("ISO C forbids qualified function types");
4499 type = c_build_qualified_type (type, type_quals);
4502 /* When the pointed-to type involves components of variable size,
4503 care must be taken to ensure that the size evaluation code is
4504 emitted early enough to dominate all the possible later uses
4505 and late enough for the variables on which it depends to have
4508 This is expected to happen automatically when the pointed-to
4509 type has a name/declaration of it's own, but special attention
4510 is required if the type is anonymous.
4512 We handle the NORMAL and FIELD contexts here by attaching an
4513 artificial TYPE_DECL to such pointed-to type. This forces the
4514 sizes evaluation at a safe point and ensures it is not deferred
4515 until e.g. within a deeper conditional context.
4517 We expect nothing to be needed here for PARM or TYPENAME.
4518 Pushing a TYPE_DECL at this point for TYPENAME would actually
4519 be incorrect, as we might be in the middle of an expression
4520 with side effects on the pointed-to type size "arguments" prior
4521 to the pointer declaration point and the fake TYPE_DECL in the
4522 enclosing context would force the size evaluation prior to the
4525 if (!TYPE_NAME (type)
4526 && (decl_context == NORMAL || decl_context == FIELD)
4527 && variably_modified_type_p (type, NULL_TREE))
4529 tree decl = build_decl (TYPE_DECL, NULL_TREE, type);
4530 DECL_ARTIFICIAL (decl) = 1;
4532 finish_decl (decl, NULL_TREE, NULL_TREE);
4533 TYPE_NAME (type) = decl;
4536 type = build_pointer_type (type);
4538 /* Process type qualifiers (such as const or volatile)
4539 that were given inside the `*'. */
4540 type_quals = declarator->u.pointer_quals;
4542 declarator = declarator->declarator;
4550 /* Now TYPE has the actual type, apart from any qualifiers in
4553 /* Check the type and width of a bit-field. */
4555 check_bitfield_type_and_width (&type, width, orig_name);
4557 /* Did array size calculations overflow? */
4559 if (TREE_CODE (type) == ARRAY_TYPE
4560 && COMPLETE_TYPE_P (type)
4561 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4562 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4564 error ("size of array %qs is too large", name);
4565 /* If we proceed with the array type as it is, we'll eventually
4566 crash in tree_low_cst(). */
4567 type = error_mark_node;
4570 /* If this is declaring a typedef name, return a TYPE_DECL. */
4572 if (storage_class == csc_typedef)
4575 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4577 pedwarn ("ISO C forbids qualified function types");
4579 type = c_build_qualified_type (type, type_quals);
4580 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4581 if (declspecs->explicit_signed_p)
4582 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4583 decl_attributes (&decl, returned_attrs, 0);
4584 if (declspecs->inline_p)
4585 pedwarn ("typedef %q+D declared %<inline%>", decl);
4589 /* If this is a type name (such as, in a cast or sizeof),
4590 compute the type and return it now. */
4592 if (decl_context == TYPENAME)
4594 /* Note that the grammar rejects storage classes in typenames
4596 gcc_assert (storage_class == csc_none && !threadp
4597 && !declspecs->inline_p);
4598 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4600 pedwarn ("ISO C forbids const or volatile function types");
4602 type = c_build_qualified_type (type, type_quals);
4603 decl_attributes (&type, returned_attrs, 0);
4607 if (pedantic && decl_context == FIELD
4608 && variably_modified_type_p (type, NULL_TREE))
4611 pedwarn ("a member of a structure or union cannot have a variably modified type");
4614 /* Aside from typedefs and type names (handle above),
4615 `void' at top level (not within pointer)
4616 is allowed only in public variables.
4617 We don't complain about parms either, but that is because
4618 a better error message can be made later. */
4620 if (VOID_TYPE_P (type) && decl_context != PARM
4621 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4622 && (storage_class == csc_extern
4623 || (current_scope == file_scope
4624 && !(storage_class == csc_static
4625 || storage_class == csc_register)))))
4627 error ("variable or field %qs declared void", name);
4628 type = integer_type_node;
4631 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4632 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4637 if (decl_context == PARM)
4639 tree type_as_written;
4642 /* A parameter declared as an array of T is really a pointer to T.
4643 One declared as a function is really a pointer to a function. */
4645 if (TREE_CODE (type) == ARRAY_TYPE)
4647 /* Transfer const-ness of array into that of type pointed to. */
4648 type = TREE_TYPE (type);
4650 type = c_build_qualified_type (type, type_quals);
4651 type = build_pointer_type (type);
4652 type_quals = array_ptr_quals;
4654 /* We don't yet implement attributes in this context. */
4655 if (array_ptr_attrs != NULL_TREE)
4656 warning (OPT_Wattributes,
4657 "attributes in parameter array declarator ignored");
4661 else if (TREE_CODE (type) == FUNCTION_TYPE)
4663 if (pedantic && type_quals)
4664 pedwarn ("ISO C forbids qualified function types");
4666 type = c_build_qualified_type (type, type_quals);
4667 type = build_pointer_type (type);
4668 type_quals = TYPE_UNQUALIFIED;
4670 else if (type_quals)
4671 type = c_build_qualified_type (type, type_quals);
4673 type_as_written = type;
4675 decl = build_decl (PARM_DECL, declarator->u.id, type);
4677 C_DECL_VARIABLE_SIZE (decl) = 1;
4679 /* Compute the type actually passed in the parmlist,
4680 for the case where there is no prototype.
4681 (For example, shorts and chars are passed as ints.)
4682 When there is a prototype, this is overridden later. */
4684 if (type == error_mark_node)
4685 promoted_type = type;
4687 promoted_type = c_type_promotes_to (type);
4689 DECL_ARG_TYPE (decl) = promoted_type;
4690 if (declspecs->inline_p)
4691 pedwarn ("parameter %q+D declared %<inline%>", decl);
4693 else if (decl_context == FIELD)
4695 /* Note that the grammar rejects storage classes in typenames
4697 gcc_assert (storage_class == csc_none && !threadp
4698 && !declspecs->inline_p);
4700 /* Structure field. It may not be a function. */
4702 if (TREE_CODE (type) == FUNCTION_TYPE)
4704 error ("field %qs declared as a function", name);
4705 type = build_pointer_type (type);
4707 else if (TREE_CODE (type) != ERROR_MARK
4708 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4710 error ("field %qs has incomplete type", name);
4711 type = error_mark_node;
4713 type = c_build_qualified_type (type, type_quals);
4714 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4715 DECL_NONADDRESSABLE_P (decl) = bitfield;
4718 C_DECL_VARIABLE_SIZE (decl) = 1;
4720 else if (TREE_CODE (type) == FUNCTION_TYPE)
4722 if (storage_class == csc_register || threadp)
4724 error ("invalid storage class for function %qs", name);
4726 else if (current_scope != file_scope)
4728 /* Function declaration not at file scope. Storage
4729 classes other than `extern' are not allowed, C99
4730 6.7.1p5, and `extern' makes no difference. However,
4731 GCC allows 'auto', perhaps with 'inline', to support
4732 nested functions. */
4733 if (storage_class == csc_auto)
4736 pedwarn ("invalid storage class for function %qs", name);
4738 else if (storage_class == csc_static)
4740 error ("invalid storage class for function %qs", name);
4742 storage_class = declspecs->storage_class = csc_none;
4748 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4749 decl = build_decl_attribute_variant (decl, decl_attr);
4751 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4753 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4754 pedwarn ("ISO C forbids qualified function types");
4756 /* GNU C interprets a volatile-qualified function type to indicate
4757 that the function does not return. */
4758 if ((type_quals & TYPE_QUAL_VOLATILE)
4759 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4760 warning (0, "%<noreturn%> function returns non-void value");
4762 /* Every function declaration is an external reference
4763 (DECL_EXTERNAL) except for those which are not at file
4764 scope and are explicitly declared "auto". This is
4765 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4766 GCC to signify a forward declaration of a nested function. */
4767 if (storage_class == csc_auto && current_scope != file_scope)
4768 DECL_EXTERNAL (decl) = 0;
4769 /* In C99, a function which is declared 'inline' with 'extern'
4770 is not an external reference (which is confusing). It
4771 means that the later definition of the function must be output
4772 in this file, C99 6.7.4p6. In GNU C89, a function declared
4773 'extern inline' is an external reference. */
4774 else if (declspecs->inline_p && storage_class != csc_static)
4775 DECL_EXTERNAL (decl) = (storage_class == csc_extern) == !flag_isoc99;
4777 DECL_EXTERNAL (decl) = !initialized;
4779 /* Record absence of global scope for `static' or `auto'. */
4781 = !(storage_class == csc_static || storage_class == csc_auto);
4783 /* For a function definition, record the argument information
4784 block where store_parm_decls will look for it. */
4786 current_function_arg_info = arg_info;
4788 if (declspecs->default_int_p)
4789 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4791 /* Record presence of `inline', if it is reasonable. */
4792 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4794 if (declspecs->inline_p)
4795 pedwarn ("cannot inline function %<main%>");
4797 else if (declspecs->inline_p)
4799 /* Record that the function is declared `inline'. */
4800 DECL_DECLARED_INLINE_P (decl) = 1;
4802 /* Do not mark bare declarations as DECL_INLINE. Doing so
4803 in the presence of multiple declarations can result in
4804 the abstract origin pointing between the declarations,
4805 which will confuse dwarf2out. */
4807 DECL_INLINE (decl) = 1;
4809 /* If -finline-functions, assume it can be inlined. This does
4810 two things: let the function be deferred until it is actually
4811 needed, and let dwarf2 know that the function is inlinable. */
4812 else if (flag_inline_trees == 2 && initialized)
4813 DECL_INLINE (decl) = 1;
4817 /* It's a variable. */
4818 /* An uninitialized decl with `extern' is a reference. */
4819 int extern_ref = !initialized && storage_class == csc_extern;
4821 type = c_build_qualified_type (type, type_quals);
4823 /* C99 6.2.2p7: It is invalid (compile-time undefined
4824 behavior) to create an 'extern' declaration for a
4825 variable if there is a global declaration that is
4826 'static' and the global declaration is not visible.
4827 (If the static declaration _is_ currently visible,
4828 the 'extern' declaration is taken to refer to that decl.) */
4829 if (extern_ref && current_scope != file_scope)
4831 tree global_decl = identifier_global_value (declarator->u.id);
4832 tree visible_decl = lookup_name (declarator->u.id);
4835 && global_decl != visible_decl
4836 && TREE_CODE (global_decl) == VAR_DECL
4837 && !TREE_PUBLIC (global_decl))
4838 error ("variable previously declared %<static%> redeclared "
4842 decl = build_decl (VAR_DECL, declarator->u.id, type);
4843 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4845 C_DECL_VARIABLE_SIZE (decl) = 1;
4847 if (declspecs->inline_p)
4848 pedwarn ("variable %q+D declared %<inline%>", decl);
4850 /* At file scope, an initialized extern declaration may follow
4851 a static declaration. In that case, DECL_EXTERNAL will be
4852 reset later in start_decl. */
4853 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4855 /* At file scope, the presence of a `static' or `register' storage
4856 class specifier, or the absence of all storage class specifiers
4857 makes this declaration a definition (perhaps tentative). Also,
4858 the absence of `static' makes it public. */
4859 if (current_scope == file_scope)
4861 TREE_PUBLIC (decl) = storage_class != csc_static;
4862 TREE_STATIC (decl) = !extern_ref;
4864 /* Not at file scope, only `static' makes a static definition. */
4867 TREE_STATIC (decl) = (storage_class == csc_static);
4868 TREE_PUBLIC (decl) = extern_ref;
4873 if (targetm.have_tls)
4874 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4876 /* A mere warning is sure to result in improper semantics
4877 at runtime. Don't bother to allow this to compile. */
4878 error ("thread-local storage not supported for this target");
4882 if (storage_class == csc_extern
4883 && variably_modified_type_p (type, NULL_TREE))
4886 error ("object with variably modified type must have no linkage");
4889 /* Record `register' declaration for warnings on &
4890 and in case doing stupid register allocation. */
4892 if (storage_class == csc_register)
4894 C_DECL_REGISTER (decl) = 1;
4895 DECL_REGISTER (decl) = 1;
4898 /* Record constancy and volatility. */
4899 c_apply_type_quals_to_decl (type_quals, decl);
4901 /* If a type has volatile components, it should be stored in memory.
4902 Otherwise, the fact that those components are volatile
4903 will be ignored, and would even crash the compiler.
4904 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4905 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4906 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4907 || TREE_CODE (decl) == RESULT_DECL))
4909 /* It is not an error for a structure with volatile fields to
4910 be declared register, but reset DECL_REGISTER since it
4911 cannot actually go in a register. */
4912 int was_reg = C_DECL_REGISTER (decl);
4913 C_DECL_REGISTER (decl) = 0;
4914 DECL_REGISTER (decl) = 0;
4915 c_mark_addressable (decl);
4916 C_DECL_REGISTER (decl) = was_reg;
4919 /* This is the earliest point at which we might know the assembler
4920 name of a variable. Thus, if it's known before this, die horribly. */
4921 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4923 decl_attributes (&decl, returned_attrs, 0);
4929 /* Decode the parameter-list info for a function type or function definition.
4930 The argument is the value returned by `get_parm_info' (or made in c-parse.c
4931 if there is an identifier list instead of a parameter decl list).
4932 These two functions are separate because when a function returns
4933 or receives functions then each is called multiple times but the order
4934 of calls is different. The last call to `grokparms' is always the one
4935 that contains the formal parameter names of a function definition.
4937 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4939 FUNCDEF_FLAG is true for a function definition, false for
4940 a mere declaration. A nonempty identifier-list gets an error message
4941 when FUNCDEF_FLAG is false. */
4944 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4946 tree arg_types = arg_info->types;
4948 if (funcdef_flag && arg_info->had_vla_unspec)
4950 /* A function definition isn't function prototype scope C99 6.2.1p4. */
4952 error ("%<[*]%> not allowed in other than function prototype scope");
4955 if (arg_types == 0 && !funcdef_flag && !in_system_header)
4956 warning (OPT_Wstrict_prototypes,
4957 "function declaration isn%'t a prototype");
4959 if (arg_types == error_mark_node)
4960 return 0; /* don't set TYPE_ARG_TYPES in this case */
4962 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4965 pedwarn ("parameter names (without types) in function declaration");
4967 arg_info->parms = arg_info->types;
4968 arg_info->types = 0;
4973 tree parm, type, typelt;
4974 unsigned int parmno;
4976 /* If there is a parameter of incomplete type in a definition,
4977 this is an error. In a declaration this is valid, and a
4978 struct or union type may be completed later, before any calls
4979 or definition of the function. In the case where the tag was
4980 first declared within the parameter list, a warning has
4981 already been given. If a parameter has void type, then
4982 however the function cannot be defined or called, so
4985 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4987 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4989 type = TREE_VALUE (typelt);
4990 if (type == error_mark_node)
4993 if (!COMPLETE_TYPE_P (type))
4997 if (DECL_NAME (parm))
4998 error ("parameter %u (%q+D) has incomplete type",
5001 error ("%Jparameter %u has incomplete type",
5004 TREE_VALUE (typelt) = error_mark_node;
5005 TREE_TYPE (parm) = error_mark_node;
5007 else if (VOID_TYPE_P (type))
5009 if (DECL_NAME (parm))
5010 warning (0, "parameter %u (%q+D) has void type",
5013 warning (0, "%Jparameter %u has void type",
5018 if (DECL_NAME (parm) && TREE_USED (parm))
5019 warn_if_shadowing (parm);
5025 /* Take apart the current scope and return a c_arg_info structure with
5026 info on a parameter list just parsed.
5028 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5030 ELLIPSIS being true means the argument list ended in '...' so don't
5031 append a sentinel (void_list_node) to the end of the type-list. */
5034 get_parm_info (bool ellipsis)
5036 struct c_binding *b = current_scope->bindings;
5037 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
5044 static bool explained_incomplete_types = false;
5045 bool gave_void_only_once_err = false;
5047 arg_info->parms = 0;
5049 arg_info->types = 0;
5050 arg_info->others = 0;
5051 arg_info->pending_sizes = 0;
5052 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
5054 /* The bindings in this scope must not get put into a block.
5055 We will take care of deleting the binding nodes. */
5056 current_scope->bindings = 0;
5058 /* This function is only called if there was *something* on the
5062 /* A parameter list consisting solely of 'void' indicates that the
5063 function takes no arguments. But if the 'void' is qualified
5064 (by 'const' or 'volatile'), or has a storage class specifier
5065 ('register'), then the behavior is undefined; issue an error.
5066 Typedefs for 'void' are OK (see DR#157). */
5067 if (b->prev == 0 /* one binding */
5068 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
5069 && !DECL_NAME (b->decl) /* anonymous */
5070 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
5072 if (TREE_THIS_VOLATILE (b->decl)
5073 || TREE_READONLY (b->decl)
5074 || C_DECL_REGISTER (b->decl))
5075 error ("%<void%> as only parameter may not be qualified");
5077 /* There cannot be an ellipsis. */
5079 error ("%<void%> must be the only parameter");
5081 arg_info->types = void_list_node;
5086 types = void_list_node;
5088 /* Break up the bindings list into parms, tags, types, and others;
5089 apply sanity checks; purge the name-to-decl bindings. */
5092 tree decl = b->decl;
5093 tree type = TREE_TYPE (decl);
5094 const char *keyword;
5096 switch (TREE_CODE (decl))
5101 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5102 I_SYMBOL_BINDING (b->id) = b->shadowed;
5105 /* Check for forward decls that never got their actual decl. */
5106 if (TREE_ASM_WRITTEN (decl))
5107 error ("parameter %q+D has just a forward declaration", decl);
5108 /* Check for (..., void, ...) and issue an error. */
5109 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
5111 if (!gave_void_only_once_err)
5113 error ("%<void%> must be the only parameter");
5114 gave_void_only_once_err = true;
5119 /* Valid parameter, add it to the list. */
5120 TREE_CHAIN (decl) = parms;
5123 /* Since there is a prototype, args are passed in their
5124 declared types. The back end may override this later. */
5125 DECL_ARG_TYPE (decl) = type;
5126 types = tree_cons (0, type, types);
5130 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
5131 case UNION_TYPE: keyword = "union"; goto tag;
5132 case RECORD_TYPE: keyword = "struct"; goto tag;
5134 /* Types may not have tag-names, in which case the type
5135 appears in the bindings list with b->id NULL. */
5138 gcc_assert (I_TAG_BINDING (b->id) == b);
5139 I_TAG_BINDING (b->id) = b->shadowed;
5142 /* Warn about any struct, union or enum tags defined in a
5143 parameter list. The scope of such types is limited to
5144 the parameter list, which is rarely if ever desirable
5145 (it's impossible to call such a function with type-
5146 correct arguments). An anonymous union parm type is
5147 meaningful as a GNU extension, so don't warn for that. */
5148 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
5151 /* The %s will be one of 'struct', 'union', or 'enum'. */
5152 warning (0, "%<%s %E%> declared inside parameter list",
5155 /* The %s will be one of 'struct', 'union', or 'enum'. */
5156 warning (0, "anonymous %s declared inside parameter list",
5159 if (!explained_incomplete_types)
5161 warning (0, "its scope is only this definition or declaration,"
5162 " which is probably not what you want");
5163 explained_incomplete_types = true;
5167 tags = tree_cons (b->id, decl, tags);
5173 /* CONST_DECLs appear here when we have an embedded enum,
5174 and TYPE_DECLs appear here when we have an embedded struct
5175 or union. No warnings for this - we already warned about the
5176 type itself. FUNCTION_DECLs appear when there is an implicit
5177 function declaration in the parameter list. */
5179 TREE_CHAIN (decl) = others;
5184 /* error_mark_node appears here when we have an undeclared
5185 variable. Just throw it away. */
5188 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5189 I_SYMBOL_BINDING (b->id) = b->shadowed;
5193 /* Other things that might be encountered. */
5200 b = free_binding_and_advance (b);
5203 arg_info->parms = parms;
5204 arg_info->tags = tags;
5205 arg_info->types = types;
5206 arg_info->others = others;
5207 arg_info->pending_sizes = get_pending_sizes ();
5211 /* Get the struct, enum or union (CODE says which) with tag NAME.
5212 Define the tag as a forward-reference if it is not defined.
5213 Return a c_typespec structure for the type specifier. */
5216 parser_xref_tag (enum tree_code code, tree name)
5218 struct c_typespec ret;
5219 /* If a cross reference is requested, look up the type
5220 already defined for this tag and return it. */
5222 tree ref = lookup_tag (code, name, 0);
5223 /* If this is the right type of tag, return what we found.
5224 (This reference will be shadowed by shadow_tag later if appropriate.)
5225 If this is the wrong type of tag, do not return it. If it was the
5226 wrong type in the same scope, we will have had an error
5227 message already; if in a different scope and declaring
5228 a name, pending_xref_error will give an error message; but if in a
5229 different scope and not declaring a name, this tag should
5230 shadow the previous declaration of a different type of tag, and
5231 this would not work properly if we return the reference found.
5232 (For example, with "struct foo" in an outer scope, "union foo;"
5233 must shadow that tag with a new one of union type.) */
5234 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5235 if (ref && TREE_CODE (ref) == code)
5241 /* If no such tag is yet defined, create a forward-reference node
5242 and record it as the "definition".
5243 When a real declaration of this type is found,
5244 the forward-reference will be altered into a real type. */
5246 ref = make_node (code);
5247 if (code == ENUMERAL_TYPE)
5249 /* Give the type a default layout like unsigned int
5250 to avoid crashing if it does not get defined. */
5251 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5252 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5253 TYPE_USER_ALIGN (ref) = 0;
5254 TYPE_UNSIGNED (ref) = 1;
5255 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5256 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5257 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5260 pushtag (name, ref);
5266 /* Get the struct, enum or union (CODE says which) with tag NAME.
5267 Define the tag as a forward-reference if it is not defined.
5268 Return a tree for the type. */
5271 xref_tag (enum tree_code code, tree name)
5273 return parser_xref_tag (code, name).spec;
5276 /* Make sure that the tag NAME is defined *in the current scope*
5277 at least as a forward reference.
5278 CODE says which kind of tag NAME ought to be. */
5281 start_struct (enum tree_code code, tree name)
5283 /* If there is already a tag defined at this scope
5284 (as a forward reference), just return it. */
5289 ref = lookup_tag (code, name, 1);
5290 if (ref && TREE_CODE (ref) == code)
5292 if (TYPE_SIZE (ref))
5294 if (code == UNION_TYPE)
5295 error ("redefinition of %<union %E%>", name);
5297 error ("redefinition of %<struct %E%>", name);
5299 else if (C_TYPE_BEING_DEFINED (ref))
5301 if (code == UNION_TYPE)
5302 error ("nested redefinition of %<union %E%>", name);
5304 error ("nested redefinition of %<struct %E%>", name);
5305 /* Don't create structures that contain themselves. */
5310 /* Otherwise create a forward-reference just so the tag is in scope. */
5312 if (ref == NULL_TREE || TREE_CODE (ref) != code)
5314 ref = make_node (code);
5315 pushtag (name, ref);
5318 C_TYPE_BEING_DEFINED (ref) = 1;
5319 TYPE_PACKED (ref) = flag_pack_struct;
5323 /* Process the specs, declarator and width (NULL if omitted)
5324 of a structure component, returning a FIELD_DECL node.
5325 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5327 This is done during the parsing of the struct declaration.
5328 The FIELD_DECL nodes are chained together and the lot of them
5329 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5332 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5337 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5338 && width == NULL_TREE)
5340 /* This is an unnamed decl.
5342 If we have something of the form "union { list } ;" then this
5343 is the anonymous union extension. Similarly for struct.
5345 If this is something of the form "struct foo;", then
5346 If MS extensions are enabled, this is handled as an
5348 Otherwise this is a forward declaration of a structure tag.
5350 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5351 If MS extensions are enabled and foo names a structure, then
5352 again this is an anonymous struct.
5353 Otherwise this is an error.
5355 Oh what a horrid tangled web we weave. I wonder if MS consciously
5356 took this from Plan 9 or if it was an accident of implementation
5357 that took root before someone noticed the bug... */
5359 tree type = declspecs->type;
5360 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5361 || TREE_CODE (type) == UNION_TYPE);
5365 && (flag_ms_extensions || !declspecs->typedef_p))
5367 if (flag_ms_extensions)
5371 else if (TYPE_NAME (type) == NULL)
5378 pedwarn ("declaration does not declare anything");
5382 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5385 value = grokdeclarator (declarator, declspecs, FIELD, false,
5386 width ? &width : NULL);
5388 finish_decl (value, NULL_TREE, NULL_TREE);
5389 DECL_INITIAL (value) = width;
5394 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5395 the list such that this does not present a problem later. */
5398 detect_field_duplicates (tree fieldlist)
5403 /* First, see if there are more than "a few" fields.
5404 This is trivially true if there are zero or one fields. */
5407 x = TREE_CHAIN (fieldlist);
5413 } while (timeout > 0 && x);
5415 /* If there were "few" fields, avoid the overhead of allocating
5416 a hash table. Instead just do the nested traversal thing. */
5419 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5422 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5423 if (DECL_NAME (y) == DECL_NAME (x))
5425 error ("duplicate member %q+D", x);
5426 DECL_NAME (x) = NULL_TREE;
5432 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5435 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5436 if ((y = DECL_NAME (x)) != 0)
5438 slot = htab_find_slot (htab, y, INSERT);
5441 error ("duplicate member %q+D", x);
5442 DECL_NAME (x) = NULL_TREE;
5451 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5452 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5453 ATTRIBUTES are attributes to be applied to the structure. */
5456 finish_struct (tree t, tree fieldlist, tree attributes)
5459 bool toplevel = file_scope == current_scope;
5460 int saw_named_field;
5462 /* If this type was previously laid out as a forward reference,
5463 make sure we lay it out again. */
5467 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5471 for (x = fieldlist; x; x = TREE_CHAIN (x))
5472 if (DECL_NAME (x) != 0)
5477 if (TREE_CODE (t) == UNION_TYPE)
5480 pedwarn ("union has no named members");
5482 pedwarn ("union has no members");
5487 pedwarn ("struct has no named members");
5489 pedwarn ("struct has no members");
5494 /* Install struct as DECL_CONTEXT of each field decl.
5495 Also process specified field sizes, found in the DECL_INITIAL,
5496 storing 0 there after the type has been changed to precision equal
5497 to its width, rather than the precision of the specified standard
5498 type. (Correct layout requires the original type to have been preserved
5501 saw_named_field = 0;
5502 for (x = fieldlist; x; x = TREE_CHAIN (x))
5504 if (TREE_TYPE (x) == error_mark_node)
5507 DECL_CONTEXT (x) = t;
5509 if (TYPE_PACKED (t) && TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)
5510 DECL_PACKED (x) = 1;
5512 /* If any field is const, the structure type is pseudo-const. */
5513 if (TREE_READONLY (x))
5514 C_TYPE_FIELDS_READONLY (t) = 1;
5517 /* A field that is pseudo-const makes the structure likewise. */
5518 tree t1 = TREE_TYPE (x);
5519 while (TREE_CODE (t1) == ARRAY_TYPE)
5520 t1 = TREE_TYPE (t1);
5521 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5522 && C_TYPE_FIELDS_READONLY (t1))
5523 C_TYPE_FIELDS_READONLY (t) = 1;
5526 /* Any field that is volatile means variables of this type must be
5527 treated in some ways as volatile. */
5528 if (TREE_THIS_VOLATILE (x))
5529 C_TYPE_FIELDS_VOLATILE (t) = 1;
5531 /* Any field of nominal variable size implies structure is too. */
5532 if (C_DECL_VARIABLE_SIZE (x))
5533 C_TYPE_VARIABLE_SIZE (t) = 1;
5535 if (DECL_INITIAL (x))
5537 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5538 DECL_SIZE (x) = bitsize_int (width);
5539 DECL_BIT_FIELD (x) = 1;
5540 SET_DECL_C_BIT_FIELD (x);
5543 /* Detect flexible array member in an invalid context. */
5544 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5545 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5546 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5547 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5549 if (TREE_CODE (t) == UNION_TYPE)
5551 error ("%Jflexible array member in union", x);
5552 TREE_TYPE (x) = error_mark_node;
5554 else if (TREE_CHAIN (x) != NULL_TREE)
5556 error ("%Jflexible array member not at end of struct", x);
5557 TREE_TYPE (x) = error_mark_node;
5559 else if (!saw_named_field)
5561 error ("%Jflexible array member in otherwise empty struct", x);
5562 TREE_TYPE (x) = error_mark_node;
5566 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5567 && flexible_array_type_p (TREE_TYPE (x)))
5568 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5571 saw_named_field = 1;
5574 detect_field_duplicates (fieldlist);
5576 /* Now we have the nearly final fieldlist. Record it,
5577 then lay out the structure or union (including the fields). */
5579 TYPE_FIELDS (t) = fieldlist;
5583 /* Give bit-fields their proper types. */
5585 tree *fieldlistp = &fieldlist;
5587 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5588 && TREE_TYPE (*fieldlistp) != error_mark_node)
5590 unsigned HOST_WIDE_INT width
5591 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5592 tree type = TREE_TYPE (*fieldlistp);
5593 if (width != TYPE_PRECISION (type))
5595 TREE_TYPE (*fieldlistp)
5596 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5597 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5599 DECL_INITIAL (*fieldlistp) = 0;
5602 fieldlistp = &TREE_CHAIN (*fieldlistp);
5605 /* Now we have the truly final field list.
5606 Store it in this type and in the variants. */
5608 TYPE_FIELDS (t) = fieldlist;
5610 /* If there are lots of fields, sort so we can look through them fast.
5611 We arbitrarily consider 16 or more elts to be "a lot". */
5616 for (x = fieldlist; x; x = TREE_CHAIN (x))
5618 if (len > 15 || DECL_NAME (x) == NULL)
5626 struct lang_type *space;
5627 struct sorted_fields_type *space2;
5629 len += list_length (x);
5631 /* Use the same allocation policy here that make_node uses, to
5632 ensure that this lives as long as the rest of the struct decl.
5633 All decls in an inline function need to be saved. */
5635 space = GGC_CNEW (struct lang_type);
5636 space2 = GGC_NEWVAR (struct sorted_fields_type,
5637 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5641 field_array = &space2->elts[0];
5642 for (x = fieldlist; x; x = TREE_CHAIN (x))
5644 field_array[len++] = x;
5646 /* If there is anonymous struct or union, break out of the loop. */
5647 if (DECL_NAME (x) == NULL)
5650 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5653 TYPE_LANG_SPECIFIC (t) = space;
5654 TYPE_LANG_SPECIFIC (t)->s->len = len;
5655 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5656 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5661 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5663 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5664 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5665 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5666 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5667 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5670 /* If this was supposed to be a transparent union, but we can't
5671 make it one, warn and turn off the flag. */
5672 if (TREE_CODE (t) == UNION_TYPE
5673 && TYPE_TRANSPARENT_UNION (t)
5674 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5676 TYPE_TRANSPARENT_UNION (t) = 0;
5677 warning (0, "union cannot be made transparent");
5680 /* If this structure or union completes the type of any previous
5681 variable declaration, lay it out and output its rtl. */
5682 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5686 tree decl = TREE_VALUE (x);
5687 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5688 layout_array_type (TREE_TYPE (decl));
5689 if (TREE_CODE (decl) != TYPE_DECL)
5691 layout_decl (decl, 0);
5692 if (c_dialect_objc ())
5693 objc_check_decl (decl);
5694 rest_of_decl_compilation (decl, toplevel, 0);
5699 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5701 /* Finish debugging output for this type. */
5702 rest_of_type_compilation (t, toplevel);
5704 /* If we're inside a function proper, i.e. not file-scope and not still
5705 parsing parameters, then arrange for the size of a variable sized type
5707 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
5708 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5713 /* Lay out the type T, and its element type, and so on. */
5716 layout_array_type (tree t)
5718 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5719 layout_array_type (TREE_TYPE (t));
5723 /* Begin compiling the definition of an enumeration type.
5724 NAME is its name (or null if anonymous).
5725 Returns the type object, as yet incomplete.
5726 Also records info about it so that build_enumerator
5727 may be used to declare the individual values as they are read. */
5730 start_enum (tree name)
5734 /* If this is the real definition for a previous forward reference,
5735 fill in the contents in the same object that used to be the
5736 forward reference. */
5739 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5741 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5743 enumtype = make_node (ENUMERAL_TYPE);
5744 pushtag (name, enumtype);
5747 if (C_TYPE_BEING_DEFINED (enumtype))
5748 error ("nested redefinition of %<enum %E%>", name);
5750 C_TYPE_BEING_DEFINED (enumtype) = 1;
5752 if (TYPE_VALUES (enumtype) != 0)
5754 /* This enum is a named one that has been declared already. */
5755 error ("redeclaration of %<enum %E%>", name);
5757 /* Completely replace its old definition.
5758 The old enumerators remain defined, however. */
5759 TYPE_VALUES (enumtype) = 0;
5762 enum_next_value = integer_zero_node;
5765 if (flag_short_enums)
5766 TYPE_PACKED (enumtype) = 1;
5771 /* After processing and defining all the values of an enumeration type,
5772 install their decls in the enumeration type and finish it off.
5773 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5774 and ATTRIBUTES are the specified attributes.
5775 Returns ENUMTYPE. */
5778 finish_enum (tree enumtype, tree values, tree attributes)
5781 tree minnode = 0, maxnode = 0;
5782 int precision, unsign;
5783 bool toplevel = (file_scope == current_scope);
5784 struct lang_type *lt;
5786 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5788 /* Calculate the maximum value of any enumerator in this type. */
5790 if (values == error_mark_node)
5791 minnode = maxnode = integer_zero_node;
5794 minnode = maxnode = TREE_VALUE (values);
5795 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5797 tree value = TREE_VALUE (pair);
5798 if (tree_int_cst_lt (maxnode, value))
5800 if (tree_int_cst_lt (value, minnode))
5805 /* Construct the final type of this enumeration. It is the same
5806 as one of the integral types - the narrowest one that fits, except
5807 that normally we only go as narrow as int - and signed iff any of
5808 the values are negative. */
5809 unsign = (tree_int_cst_sgn (minnode) >= 0);
5810 precision = MAX (min_precision (minnode, unsign),
5811 min_precision (maxnode, unsign));
5813 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5815 tem = c_common_type_for_size (precision, unsign);
5818 warning (0, "enumeration values exceed range of largest integer");
5819 tem = long_long_integer_type_node;
5823 tem = unsign ? unsigned_type_node : integer_type_node;
5825 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5826 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5827 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5828 TYPE_SIZE (enumtype) = 0;
5830 /* If the precision of the type was specific with an attribute and it
5831 was too small, give an error. Otherwise, use it. */
5832 if (TYPE_PRECISION (enumtype))
5834 if (precision > TYPE_PRECISION (enumtype))
5835 error ("specified mode too small for enumeral values");
5838 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5840 layout_type (enumtype);
5842 if (values != error_mark_node)
5844 /* Change the type of the enumerators to be the enum type. We
5845 need to do this irrespective of the size of the enum, for
5846 proper type checking. Replace the DECL_INITIALs of the
5847 enumerators, and the value slots of the list, with copies
5848 that have the enum type; they cannot be modified in place
5849 because they may be shared (e.g. integer_zero_node) Finally,
5850 change the purpose slots to point to the names of the decls. */
5851 for (pair = values; pair; pair = TREE_CHAIN (pair))
5853 tree enu = TREE_PURPOSE (pair);
5854 tree ini = DECL_INITIAL (enu);
5856 TREE_TYPE (enu) = enumtype;
5858 /* The ISO C Standard mandates enumerators to have type int,
5859 even though the underlying type of an enum type is
5860 unspecified. Here we convert any enumerators that fit in
5861 an int to type int, to avoid promotions to unsigned types
5862 when comparing integers with enumerators that fit in the
5863 int range. When -pedantic is given, build_enumerator()
5864 would have already taken care of those that don't fit. */
5865 if (int_fits_type_p (ini, integer_type_node))
5866 tem = integer_type_node;
5869 ini = convert (tem, ini);
5871 DECL_INITIAL (enu) = ini;
5872 TREE_PURPOSE (pair) = DECL_NAME (enu);
5873 TREE_VALUE (pair) = ini;
5876 TYPE_VALUES (enumtype) = values;
5879 /* Record the min/max values so that we can warn about bit-field
5880 enumerations that are too small for the values. */
5881 lt = GGC_CNEW (struct lang_type);
5882 lt->enum_min = minnode;
5883 lt->enum_max = maxnode;
5884 TYPE_LANG_SPECIFIC (enumtype) = lt;
5886 /* Fix up all variant types of this enum type. */
5887 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5889 if (tem == enumtype)
5891 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5892 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5893 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5894 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5895 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5896 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5897 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5898 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5899 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5900 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5901 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5904 /* Finish debugging output for this type. */
5905 rest_of_type_compilation (enumtype, toplevel);
5910 /* Build and install a CONST_DECL for one value of the
5911 current enumeration type (one that was begun with start_enum).
5912 Return a tree-list containing the CONST_DECL and its value.
5913 Assignment of sequential values by default is handled here. */
5916 build_enumerator (tree name, tree value)
5920 /* Validate and default VALUE. */
5924 /* Don't issue more errors for error_mark_node (i.e. an
5925 undeclared identifier) - just ignore the value expression. */
5926 if (value == error_mark_node)
5928 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5929 || TREE_CODE (value) != INTEGER_CST)
5931 error ("enumerator value for %qE is not an integer constant", name);
5936 value = default_conversion (value);
5937 constant_expression_warning (value);
5941 /* Default based on previous value. */
5942 /* It should no longer be possible to have NON_LVALUE_EXPR
5946 value = enum_next_value;
5948 error ("overflow in enumeration values");
5951 if (pedantic && !int_fits_type_p (value, integer_type_node))
5953 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5954 /* XXX This causes -pedantic to change the meaning of the program.
5955 Remove? -zw 2004-03-15 */
5956 value = convert (integer_type_node, value);
5959 /* Set basis for default for next value. */
5960 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5961 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5963 /* Now create a declaration for the enum value name. */
5965 type = TREE_TYPE (value);
5966 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5967 TYPE_PRECISION (integer_type_node)),
5968 (TYPE_PRECISION (type)
5969 >= TYPE_PRECISION (integer_type_node)
5970 && TYPE_UNSIGNED (type)));
5972 decl = build_decl (CONST_DECL, name, type);
5973 DECL_INITIAL (decl) = convert (type, value);
5976 return tree_cons (decl, value, NULL_TREE);
5980 /* Create the FUNCTION_DECL for a function definition.
5981 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5982 the declaration; they describe the function's name and the type it returns,
5983 but twisted together in a fashion that parallels the syntax of C.
5985 This function creates a binding context for the function body
5986 as well as setting up the FUNCTION_DECL in current_function_decl.
5988 Returns 1 on success. If the DECLARATOR is not suitable for a function
5989 (it defines a datum instead), we return 0, which tells
5990 yyparse to report a parse error. */
5993 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5996 tree decl1, old_decl;
5997 tree restype, resdecl;
5998 struct c_label_context_se *nstack_se;
5999 struct c_label_context_vm *nstack_vm;
6001 current_function_returns_value = 0; /* Assume, until we see it does. */
6002 current_function_returns_null = 0;
6003 current_function_returns_abnormally = 0;
6004 warn_about_return_type = 0;
6005 c_switch_stack = NULL;
6007 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
6008 nstack_se->labels_def = NULL;
6009 nstack_se->labels_used = NULL;
6010 nstack_se->next = label_context_stack_se;
6011 label_context_stack_se = nstack_se;
6013 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
6014 nstack_vm->labels_def = NULL;
6015 nstack_vm->labels_used = NULL;
6016 nstack_vm->scope = 0;
6017 nstack_vm->next = label_context_stack_vm;
6018 label_context_stack_vm = nstack_vm;
6020 /* Indicate no valid break/continue context by setting these variables
6021 to some non-null, non-label value. We'll notice and emit the proper
6022 error message in c_finish_bc_stmt. */
6023 c_break_label = c_cont_label = size_zero_node;
6025 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
6027 /* If the declarator is not suitable for a function definition,
6028 cause a syntax error. */
6031 label_context_stack_se = label_context_stack_se->next;
6032 label_context_stack_vm = label_context_stack_vm->next;
6036 decl_attributes (&decl1, attributes, 0);
6038 if (DECL_DECLARED_INLINE_P (decl1)
6039 && DECL_UNINLINABLE (decl1)
6040 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6041 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
6044 announce_function (decl1);
6046 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6048 error ("return type is an incomplete type");
6049 /* Make it return void instead. */
6051 = build_function_type (void_type_node,
6052 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6055 if (warn_about_return_type)
6056 pedwarn_c99 ("return type defaults to %<int%>");
6058 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6059 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6060 DECL_INITIAL (decl1) = error_mark_node;
6062 /* If this definition isn't a prototype and we had a prototype declaration
6063 before, copy the arg type info from that prototype. */
6064 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
6065 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
6067 current_function_prototype_locus = UNKNOWN_LOCATION;
6068 current_function_prototype_built_in = false;
6069 current_function_prototype_arg_types = NULL_TREE;
6070 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6072 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6073 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6074 TREE_TYPE (TREE_TYPE (old_decl))))
6076 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
6078 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
6079 current_function_prototype_built_in
6080 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
6081 current_function_prototype_arg_types
6082 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
6084 if (TREE_PUBLIC (decl1))
6086 /* If there is an external prototype declaration of this
6087 function, record its location but do not copy information
6088 to this decl. This may be an invisible declaration
6089 (built-in or in a scope which has finished) or simply
6090 have more refined argument types than any declaration
6092 struct c_binding *b;
6093 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
6094 if (B_IN_SCOPE (b, external_scope))
6098 tree ext_decl, ext_type;
6100 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
6101 if (TREE_CODE (ext_type) == FUNCTION_TYPE
6102 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6103 TREE_TYPE (ext_type)))
6105 current_function_prototype_locus
6106 = DECL_SOURCE_LOCATION (ext_decl);
6107 current_function_prototype_built_in
6108 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
6109 current_function_prototype_arg_types
6110 = TYPE_ARG_TYPES (ext_type);
6116 /* Optionally warn of old-fashioned def with no previous prototype. */
6117 if (warn_strict_prototypes
6118 && old_decl != error_mark_node
6119 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6120 && C_DECL_ISNT_PROTOTYPE (old_decl))
6121 warning (OPT_Wstrict_prototypes,
6122 "function declaration isn%'t a prototype");
6123 /* Optionally warn of any global def with no previous prototype. */
6124 else if (warn_missing_prototypes
6125 && old_decl != error_mark_node
6126 && TREE_PUBLIC (decl1)
6127 && !MAIN_NAME_P (DECL_NAME (decl1))
6128 && C_DECL_ISNT_PROTOTYPE (old_decl))
6129 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
6130 /* Optionally warn of any def with no previous prototype
6131 if the function has already been used. */
6132 else if (warn_missing_prototypes
6134 && old_decl != error_mark_node
6135 && TREE_USED (old_decl)
6136 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6137 warning (OPT_Wmissing_prototypes,
6138 "%q+D was used with no prototype before its definition", decl1);
6139 /* Optionally warn of any global def with no previous declaration. */
6140 else if (warn_missing_declarations
6141 && TREE_PUBLIC (decl1)
6143 && !MAIN_NAME_P (DECL_NAME (decl1)))
6144 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
6146 /* Optionally warn of any def with no previous declaration
6147 if the function has already been used. */
6148 else if (warn_missing_declarations
6150 && old_decl != error_mark_node
6151 && TREE_USED (old_decl)
6152 && C_DECL_IMPLICIT (old_decl))
6153 warning (OPT_Wmissing_declarations,
6154 "%q+D was used with no declaration before its definition", decl1);
6156 /* This function exists in static storage.
6157 (This does not mean `static' in the C sense!) */
6158 TREE_STATIC (decl1) = 1;
6160 /* A nested function is not global. */
6161 if (current_function_decl != 0)
6162 TREE_PUBLIC (decl1) = 0;
6164 /* This is the earliest point at which we might know the assembler
6165 name of the function. Thus, if it's set before this, die horribly. */
6166 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
6168 /* If #pragma weak was used, mark the decl weak now. */
6169 if (current_scope == file_scope)
6170 maybe_apply_pragma_weak (decl1);
6172 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6173 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6175 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6176 != integer_type_node)
6177 pedwarn ("return type of %q+D is not %<int%>", decl1);
6179 check_main_parameter_types(decl1);
6181 if (!TREE_PUBLIC (decl1))
6182 pedwarn ("%q+D is normally a non-static function", decl1);
6185 /* Record the decl so that the function name is defined.
6186 If we already have a decl for this name, and it is a FUNCTION_DECL,
6187 use the old decl. */
6189 current_function_decl = pushdecl (decl1);
6192 declare_parm_level ();
6194 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6195 /* Promote the value to int before returning it. */
6196 if (c_promoting_integer_type_p (restype))
6198 /* It retains unsignedness if not really getting wider. */
6199 if (TYPE_UNSIGNED (restype)
6200 && (TYPE_PRECISION (restype)
6201 == TYPE_PRECISION (integer_type_node)))
6202 restype = unsigned_type_node;
6204 restype = integer_type_node;
6207 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6208 DECL_ARTIFICIAL (resdecl) = 1;
6209 DECL_IGNORED_P (resdecl) = 1;
6210 DECL_RESULT (current_function_decl) = resdecl;
6212 start_fname_decls ();
6217 /* Subroutine of store_parm_decls which handles new-style function
6218 definitions (prototype format). The parms already have decls, so we
6219 need only record them as in effect and complain if any redundant
6220 old-style parm decls were written. */
6222 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6226 if (current_scope->bindings)
6228 error ("%Jold-style parameter declarations in prototyped "
6229 "function definition", fndecl);
6231 /* Get rid of the old-style declarations. */
6235 /* Don't issue this warning for nested functions, and don't issue this
6236 warning if we got here because ARG_INFO_TYPES was error_mark_node
6237 (this happens when a function definition has just an ellipsis in
6238 its parameter list). */
6239 else if (!in_system_header && !current_function_scope
6240 && arg_info->types != error_mark_node)
6241 warning (OPT_Wtraditional,
6242 "%Jtraditional C rejects ISO C style function definitions",
6245 /* Now make all the parameter declarations visible in the function body.
6246 We can bypass most of the grunt work of pushdecl. */
6247 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6249 DECL_CONTEXT (decl) = current_function_decl;
6250 if (DECL_NAME (decl))
6252 bind (DECL_NAME (decl), decl, current_scope,
6253 /*invisible=*/false, /*nested=*/false);
6254 if (!TREE_USED (decl))
6255 warn_if_shadowing (decl);
6258 error ("%Jparameter name omitted", decl);
6261 /* Record the parameter list in the function declaration. */
6262 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6264 /* Now make all the ancillary declarations visible, likewise. */
6265 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6267 DECL_CONTEXT (decl) = current_function_decl;
6268 if (DECL_NAME (decl))
6269 bind (DECL_NAME (decl), decl, current_scope,
6270 /*invisible=*/false, /*nested=*/false);
6273 /* And all the tag declarations. */
6274 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6275 if (TREE_PURPOSE (decl))
6276 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6277 /*invisible=*/false, /*nested=*/false);
6280 /* Subroutine of store_parm_decls which handles old-style function
6281 definitions (separate parameter list and declarations). */
6284 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6286 struct c_binding *b;
6287 tree parm, decl, last;
6288 tree parmids = arg_info->parms;
6289 struct pointer_set_t *seen_args = pointer_set_create ();
6291 if (!in_system_header)
6292 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6295 /* Match each formal parameter name with its declaration. Save each
6296 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6297 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6299 if (TREE_VALUE (parm) == 0)
6301 error ("%Jparameter name missing from parameter list", fndecl);
6302 TREE_PURPOSE (parm) = 0;
6306 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6307 if (b && B_IN_CURRENT_SCOPE (b))
6310 /* If we got something other than a PARM_DECL it is an error. */
6311 if (TREE_CODE (decl) != PARM_DECL)
6312 error ("%q+D declared as a non-parameter", decl);
6313 /* If the declaration is already marked, we have a duplicate
6314 name. Complain and ignore the duplicate. */
6315 else if (pointer_set_contains (seen_args, decl))
6317 error ("multiple parameters named %q+D", decl);
6318 TREE_PURPOSE (parm) = 0;
6321 /* If the declaration says "void", complain and turn it into
6323 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6325 error ("parameter %q+D declared with void type", decl);
6326 TREE_TYPE (decl) = integer_type_node;
6327 DECL_ARG_TYPE (decl) = integer_type_node;
6328 layout_decl (decl, 0);
6330 warn_if_shadowing (decl);
6332 /* If no declaration found, default to int. */
6335 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6336 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6337 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6339 warn_if_shadowing (decl);
6342 pedwarn ("type of %q+D defaults to %<int%>", decl);
6343 else if (extra_warnings)
6344 warning (OPT_Wextra, "type of %q+D defaults to %<int%>", decl);
6347 TREE_PURPOSE (parm) = decl;
6348 pointer_set_insert (seen_args, decl);
6351 /* Now examine the parms chain for incomplete declarations
6352 and declarations with no corresponding names. */
6354 for (b = current_scope->bindings; b; b = b->prev)
6357 if (TREE_CODE (parm) != PARM_DECL)
6360 if (TREE_TYPE (parm) != error_mark_node
6361 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6363 error ("parameter %q+D has incomplete type", parm);
6364 TREE_TYPE (parm) = error_mark_node;
6367 if (!pointer_set_contains (seen_args, parm))
6369 error ("declaration for parameter %q+D but no such parameter", parm);
6371 /* Pretend the parameter was not missing.
6372 This gets us to a standard state and minimizes
6373 further error messages. */
6374 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6378 /* Chain the declarations together in the order of the list of
6379 names. Store that chain in the function decl, replacing the
6380 list of names. Update the current scope to match. */
6381 DECL_ARGUMENTS (fndecl) = 0;
6383 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6384 if (TREE_PURPOSE (parm))
6386 if (parm && TREE_PURPOSE (parm))
6388 last = TREE_PURPOSE (parm);
6389 DECL_ARGUMENTS (fndecl) = last;
6391 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6392 if (TREE_PURPOSE (parm))
6394 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6395 last = TREE_PURPOSE (parm);
6397 TREE_CHAIN (last) = 0;
6400 pointer_set_destroy (seen_args);
6402 /* If there was a previous prototype,
6403 set the DECL_ARG_TYPE of each argument according to
6404 the type previously specified, and report any mismatches. */
6406 if (current_function_prototype_arg_types)
6409 for (parm = DECL_ARGUMENTS (fndecl),
6410 type = current_function_prototype_arg_types;
6411 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6412 != void_type_node));
6413 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6415 if (parm == 0 || type == 0
6416 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6418 if (current_function_prototype_built_in)
6419 warning (0, "number of arguments doesn%'t match "
6420 "built-in prototype");
6423 error ("number of arguments doesn%'t match prototype");
6424 error ("%Hprototype declaration",
6425 ¤t_function_prototype_locus);
6429 /* Type for passing arg must be consistent with that
6430 declared for the arg. ISO C says we take the unqualified
6431 type for parameters declared with qualified type. */
6432 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6433 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6435 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6436 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6438 /* Adjust argument to match prototype. E.g. a previous
6439 `int foo(float);' prototype causes
6440 `int foo(x) float x; {...}' to be treated like
6441 `int foo(float x) {...}'. This is particularly
6442 useful for argument types like uid_t. */
6443 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6445 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6446 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6447 && TYPE_PRECISION (TREE_TYPE (parm))
6448 < TYPE_PRECISION (integer_type_node))
6449 DECL_ARG_TYPE (parm) = integer_type_node;
6453 /* ??? Is it possible to get here with a
6454 built-in prototype or will it always have
6455 been diagnosed as conflicting with an
6456 old-style definition and discarded? */
6457 if (current_function_prototype_built_in)
6458 warning (0, "promoted argument %qD "
6459 "doesn%'t match built-in prototype", parm);
6462 pedwarn ("promoted argument %qD "
6463 "doesn%'t match prototype", parm);
6464 pedwarn ("%Hprototype declaration",
6465 ¤t_function_prototype_locus);
6471 if (current_function_prototype_built_in)
6472 warning (0, "argument %qD doesn%'t match "
6473 "built-in prototype", parm);
6476 error ("argument %qD doesn%'t match prototype", parm);
6477 error ("%Hprototype declaration",
6478 ¤t_function_prototype_locus);
6483 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6486 /* Otherwise, create a prototype that would match. */
6490 tree actual = 0, last = 0, type;
6492 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6494 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6496 TREE_CHAIN (last) = type;
6501 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6503 TREE_CHAIN (last) = type;
6507 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6508 of the type of this function, but we need to avoid having this
6509 affect the types of other similarly-typed functions, so we must
6510 first force the generation of an identical (but separate) type
6511 node for the relevant function type. The new node we create
6512 will be a variant of the main variant of the original function
6515 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6517 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6521 /* Store parameter declarations passed in ARG_INFO into the current
6522 function declaration. */
6525 store_parm_decls_from (struct c_arg_info *arg_info)
6527 current_function_arg_info = arg_info;
6528 store_parm_decls ();
6531 /* Store the parameter declarations into the current function declaration.
6532 This is called after parsing the parameter declarations, before
6533 digesting the body of the function.
6535 For an old-style definition, construct a prototype out of the old-style
6536 parameter declarations and inject it into the function's type. */
6539 store_parm_decls (void)
6541 tree fndecl = current_function_decl;
6544 /* The argument information block for FNDECL. */
6545 struct c_arg_info *arg_info = current_function_arg_info;
6546 current_function_arg_info = 0;
6548 /* True if this definition is written with a prototype. Note:
6549 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6550 list in a function definition as equivalent to (void) -- an
6551 empty argument list specifies the function has no parameters,
6552 but only (void) sets up a prototype for future calls. */
6553 proto = arg_info->types != 0;
6556 store_parm_decls_newstyle (fndecl, arg_info);
6558 store_parm_decls_oldstyle (fndecl, arg_info);
6560 /* The next call to push_scope will be a function body. */
6562 next_is_function_body = true;
6564 /* Write a record describing this function definition to the prototypes
6565 file (if requested). */
6567 gen_aux_info_record (fndecl, 1, 0, proto);
6569 /* Initialize the RTL code for the function. */
6570 allocate_struct_function (fndecl);
6572 /* Begin the statement tree for this function. */
6573 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6575 /* ??? Insert the contents of the pending sizes list into the function
6576 to be evaluated. The only reason left to have this is
6577 void foo(int n, int array[n++])
6578 because we throw away the array type in favor of a pointer type, and
6579 thus won't naturally see the SAVE_EXPR containing the increment. All
6580 other pending sizes would be handled by gimplify_parameters. */
6583 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6584 add_stmt (TREE_VALUE (t));
6587 /* Even though we're inside a function body, we still don't want to
6588 call expand_expr to calculate the size of a variable-sized array.
6589 We haven't necessarily assigned RTL to all variables yet, so it's
6590 not safe to try to expand expressions involving them. */
6591 cfun->x_dont_save_pending_sizes_p = 1;
6594 /* Emit diagnostics that require gimple input for detection. Operate on
6595 FNDECL and all its nested functions. */
6598 c_gimple_diagnostics_recursively (tree fndecl)
6600 struct cgraph_node *cgn;
6602 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6603 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6605 /* Notice when OpenMP structured block constraints are violated. */
6607 diagnose_omp_structured_block_errors (fndecl);
6609 /* Finalize all nested functions now. */
6610 cgn = cgraph_node (fndecl);
6611 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6612 c_gimple_diagnostics_recursively (cgn->decl);
6615 /* Finish up a function declaration and compile that function
6616 all the way to assembler language output. The free the storage
6617 for the function definition.
6619 This is called after parsing the body of the function definition. */
6622 finish_function (void)
6624 tree fndecl = current_function_decl;
6626 label_context_stack_se = label_context_stack_se->next;
6627 label_context_stack_vm = label_context_stack_vm->next;
6629 if (TREE_CODE (fndecl) == FUNCTION_DECL
6630 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6632 tree args = DECL_ARGUMENTS (fndecl);
6633 for (; args; args = TREE_CHAIN (args))
6635 tree type = TREE_TYPE (args);
6636 if (INTEGRAL_TYPE_P (type)
6637 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6638 DECL_ARG_TYPE (args) = integer_type_node;
6642 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6643 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6645 /* Must mark the RESULT_DECL as being in this function. */
6647 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6648 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6650 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6652 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6653 != integer_type_node)
6655 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6656 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6658 pedwarn ("return type of %q+D is not %<int%>", fndecl);
6664 tree stmt = c_finish_return (integer_zero_node);
6665 #ifdef USE_MAPPED_LOCATION
6666 /* Hack. We don't want the middle-end to warn that this return
6667 is unreachable, so we mark its location as special. Using
6668 UNKNOWN_LOCATION has the problem that it gets clobbered in
6669 annotate_one_with_locus. A cleaner solution might be to
6670 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6672 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6674 /* Hack. We don't want the middle-end to warn that this
6675 return is unreachable, so put the statement on the
6677 annotate_with_file_line (stmt, input_filename, 0);
6683 /* Tie off the statement tree for this function. */
6684 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6686 finish_fname_decls ();
6688 /* Complain if there's just no return statement. */
6689 if (warn_return_type
6690 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6691 && !current_function_returns_value && !current_function_returns_null
6692 /* Don't complain if we are no-return. */
6693 && !current_function_returns_abnormally
6694 /* Don't warn for main(). */
6695 && !MAIN_NAME_P (DECL_NAME (fndecl))
6696 /* Or if they didn't actually specify a return type. */
6697 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6698 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6699 inline function, as we might never be compiled separately. */
6700 && DECL_INLINE (fndecl))
6702 warning (OPT_Wreturn_type,
6703 "no return statement in function returning non-void");
6704 TREE_NO_WARNING (fndecl) = 1;
6707 /* With just -Wextra, complain only if function returns both with
6708 and without a value. */
6710 && current_function_returns_value
6711 && current_function_returns_null)
6712 warning (OPT_Wextra, "this function may return with or without a value");
6714 /* Store the end of the function, so that we get good line number
6715 info for the epilogue. */
6716 cfun->function_end_locus = input_location;
6718 /* If we don't have ctors/dtors sections, and this is a static
6719 constructor or destructor, it must be recorded now. */
6720 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6721 && !targetm.have_ctors_dtors)
6722 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6723 if (DECL_STATIC_DESTRUCTOR (fndecl)
6724 && !targetm.have_ctors_dtors)
6725 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6727 /* Finalize the ELF visibility for the function. */
6728 c_determine_visibility (fndecl);
6730 /* Genericize before inlining. Delay genericizing nested functions
6731 until their parent function is genericized. Since finalizing
6732 requires GENERIC, delay that as well. */
6734 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6735 && !undef_nested_function)
6737 if (!decl_function_context (fndecl))
6739 c_genericize (fndecl);
6740 c_gimple_diagnostics_recursively (fndecl);
6742 /* ??? Objc emits functions after finalizing the compilation unit.
6743 This should be cleaned up later and this conditional removed. */
6744 if (cgraph_global_info_ready)
6746 c_expand_body (fndecl);
6750 cgraph_finalize_function (fndecl, false);
6754 /* Register this function with cgraph just far enough to get it
6755 added to our parent's nested function list. Handy, since the
6756 C front end doesn't have such a list. */
6757 (void) cgraph_node (fndecl);
6761 if (!decl_function_context (fndecl))
6762 undef_nested_function = false;
6764 /* We're leaving the context of this function, so zap cfun.
6765 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6766 tree_rest_of_compilation. */
6768 current_function_decl = NULL;
6771 /* Generate the RTL for the body of FNDECL. */
6774 c_expand_body (tree fndecl)
6777 if (!DECL_INITIAL (fndecl)
6778 || DECL_INITIAL (fndecl) == error_mark_node)
6781 tree_rest_of_compilation (fndecl);
6783 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6784 && targetm.have_ctors_dtors)
6785 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6786 DEFAULT_INIT_PRIORITY);
6787 if (DECL_STATIC_DESTRUCTOR (fndecl)
6788 && targetm.have_ctors_dtors)
6789 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6790 DEFAULT_INIT_PRIORITY);
6793 /* Check the declarations given in a for-loop for satisfying the C99
6794 constraints. If exactly one such decl is found, return it. */
6797 check_for_loop_decls (void)
6799 struct c_binding *b;
6800 tree one_decl = NULL_TREE;
6806 /* If we get here, declarations have been used in a for loop without
6807 the C99 for loop scope. This doesn't make much sense, so don't
6809 error ("%<for%> loop initial declaration used outside C99 mode");
6812 /* C99 subclause 6.8.5 paragraph 3:
6814 [#3] The declaration part of a for statement shall only
6815 declare identifiers for objects having storage class auto or
6818 It isn't clear whether, in this sentence, "identifiers" binds to
6819 "shall only declare" or to "objects" - that is, whether all identifiers
6820 declared must be identifiers for objects, or whether the restriction
6821 only applies to those that are. (A question on this in comp.std.c
6822 in November 2000 received no answer.) We implement the strictest
6823 interpretation, to avoid creating an extension which later causes
6826 for (b = current_scope->bindings; b; b = b->prev)
6829 tree decl = b->decl;
6834 switch (TREE_CODE (decl))
6837 if (TREE_STATIC (decl))
6838 error ("declaration of static variable %q+D in %<for%> loop "
6839 "initial declaration", decl);
6840 else if (DECL_EXTERNAL (decl))
6841 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6842 "initial declaration", decl);
6846 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6850 error ("%<union %E%> declared in %<for%> loop initial declaration",
6854 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6858 error ("declaration of non-variable %q+D in %<for%> loop "
6859 "initial declaration", decl);
6866 return n_decls == 1 ? one_decl : NULL_TREE;
6869 /* Save and reinitialize the variables
6870 used during compilation of a C function. */
6873 c_push_function_context (struct function *f)
6875 struct language_function *p;
6876 p = GGC_NEW (struct language_function);
6879 p->base.x_stmt_tree = c_stmt_tree;
6880 p->x_break_label = c_break_label;
6881 p->x_cont_label = c_cont_label;
6882 p->x_switch_stack = c_switch_stack;
6883 p->arg_info = current_function_arg_info;
6884 p->returns_value = current_function_returns_value;
6885 p->returns_null = current_function_returns_null;
6886 p->returns_abnormally = current_function_returns_abnormally;
6887 p->warn_about_return_type = warn_about_return_type;
6890 /* Restore the variables used during compilation of a C function. */
6893 c_pop_function_context (struct function *f)
6895 struct language_function *p = f->language;
6897 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6898 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6900 /* Stop pointing to the local nodes about to be freed. */
6901 /* But DECL_INITIAL must remain nonzero so we know this
6902 was an actual function definition. */
6903 DECL_INITIAL (current_function_decl) = error_mark_node;
6904 DECL_ARGUMENTS (current_function_decl) = 0;
6907 c_stmt_tree = p->base.x_stmt_tree;
6908 c_break_label = p->x_break_label;
6909 c_cont_label = p->x_cont_label;
6910 c_switch_stack = p->x_switch_stack;
6911 current_function_arg_info = p->arg_info;
6912 current_function_returns_value = p->returns_value;
6913 current_function_returns_null = p->returns_null;
6914 current_function_returns_abnormally = p->returns_abnormally;
6915 warn_about_return_type = p->warn_about_return_type;
6920 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6923 c_dup_lang_specific_decl (tree decl)
6925 struct lang_decl *ld;
6927 if (!DECL_LANG_SPECIFIC (decl))
6930 ld = GGC_NEW (struct lang_decl);
6931 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6932 DECL_LANG_SPECIFIC (decl) = ld;
6935 /* The functions below are required for functionality of doing
6936 function at once processing in the C front end. Currently these
6937 functions are not called from anywhere in the C front end, but as
6938 these changes continue, that will change. */
6940 /* Returns the stmt_tree (if any) to which statements are currently
6941 being added. If there is no active statement-tree, NULL is
6945 current_stmt_tree (void)
6947 return &c_stmt_tree;
6950 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6954 anon_aggr_type_p (tree ARG_UNUSED (node))
6959 /* Return the global value of T as a symbol. */
6962 identifier_global_value (tree t)
6964 struct c_binding *b;
6966 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6967 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6973 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6974 otherwise the name is found in ridpointers from RID_INDEX. */
6977 record_builtin_type (enum rid rid_index, const char *name, tree type)
6981 id = ridpointers[(int) rid_index];
6983 id = get_identifier (name);
6984 decl = build_decl (TYPE_DECL, id, type);
6986 if (debug_hooks->type_decl)
6987 debug_hooks->type_decl (decl, false);
6990 /* Build the void_list_node (void_type_node having been created). */
6992 build_void_list_node (void)
6994 tree t = build_tree_list (NULL_TREE, void_type_node);
6998 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
7001 build_c_parm (struct c_declspecs *specs, tree attrs,
7002 struct c_declarator *declarator)
7004 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
7007 ret->declarator = declarator;
7011 /* Return a declarator with nested attributes. TARGET is the inner
7012 declarator to which these attributes apply. ATTRS are the
7015 struct c_declarator *
7016 build_attrs_declarator (tree attrs, struct c_declarator *target)
7018 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7019 ret->kind = cdk_attrs;
7020 ret->declarator = target;
7021 ret->u.attrs = attrs;
7025 /* Return a declarator for a function with arguments specified by ARGS
7026 and return type specified by TARGET. */
7028 struct c_declarator *
7029 build_function_declarator (struct c_arg_info *args,
7030 struct c_declarator *target)
7032 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7033 ret->kind = cdk_function;
7034 ret->declarator = target;
7035 ret->u.arg_info = args;
7039 /* Return a declarator for the identifier IDENT (which may be
7040 NULL_TREE for an abstract declarator). */
7042 struct c_declarator *
7043 build_id_declarator (tree ident)
7045 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7047 ret->declarator = 0;
7049 /* Default value - may get reset to a more precise location. */
7050 ret->id_loc = input_location;
7054 /* Return something to represent absolute declarators containing a *.
7055 TARGET is the absolute declarator that the * contains.
7056 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7057 to apply to the pointer type. */
7059 struct c_declarator *
7060 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
7061 struct c_declarator *target)
7065 struct c_declarator *itarget = target;
7066 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7067 if (type_quals_attrs)
7069 attrs = type_quals_attrs->attrs;
7070 quals = quals_from_declspecs (type_quals_attrs);
7071 if (attrs != NULL_TREE)
7072 itarget = build_attrs_declarator (attrs, target);
7074 ret->kind = cdk_pointer;
7075 ret->declarator = itarget;
7076 ret->u.pointer_quals = quals;
7080 /* Return a pointer to a structure for an empty list of declaration
7083 struct c_declspecs *
7084 build_null_declspecs (void)
7086 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
7090 ret->typespec_word = cts_none;
7091 ret->storage_class = csc_none;
7092 ret->declspecs_seen_p = false;
7093 ret->type_seen_p = false;
7094 ret->non_sc_seen_p = false;
7095 ret->typedef_p = false;
7096 ret->tag_defined_p = false;
7097 ret->explicit_signed_p = false;
7098 ret->deprecated_p = false;
7099 ret->default_int_p = false;
7100 ret->long_p = false;
7101 ret->long_long_p = false;
7102 ret->short_p = false;
7103 ret->signed_p = false;
7104 ret->unsigned_p = false;
7105 ret->complex_p = false;
7106 ret->inline_p = false;
7107 ret->thread_p = false;
7108 ret->const_p = false;
7109 ret->volatile_p = false;
7110 ret->restrict_p = false;
7114 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7117 struct c_declspecs *
7118 declspecs_add_qual (struct c_declspecs *specs, tree qual)
7122 specs->non_sc_seen_p = true;
7123 specs->declspecs_seen_p = true;
7124 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
7125 && C_IS_RESERVED_WORD (qual));
7126 i = C_RID_CODE (qual);
7130 dupe = specs->const_p;
7131 specs->const_p = true;
7134 dupe = specs->volatile_p;
7135 specs->volatile_p = true;
7138 dupe = specs->restrict_p;
7139 specs->restrict_p = true;
7144 if (dupe && pedantic && !flag_isoc99)
7145 pedwarn ("duplicate %qE", qual);
7149 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7152 struct c_declspecs *
7153 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7155 tree type = spec.spec;
7156 specs->non_sc_seen_p = true;
7157 specs->declspecs_seen_p = true;
7158 specs->type_seen_p = true;
7159 if (TREE_DEPRECATED (type))
7160 specs->deprecated_p = true;
7162 /* Handle type specifier keywords. */
7163 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
7165 enum rid i = C_RID_CODE (type);
7168 error ("two or more data types in declaration specifiers");
7171 if ((int) i <= (int) RID_LAST_MODIFIER)
7173 /* "long", "short", "signed", "unsigned" or "_Complex". */
7178 if (specs->long_long_p)
7180 error ("%<long long long%> is too long for GCC");
7185 if (specs->typespec_word == cts_double)
7187 error ("both %<long long%> and %<double%> in "
7188 "declaration specifiers");
7191 if (pedantic && !flag_isoc99 && !in_system_header
7193 pedwarn ("ISO C90 does not support %<long long%>");
7194 specs->long_long_p = 1;
7198 error ("both %<long%> and %<short%> in "
7199 "declaration specifiers");
7200 else if (specs->typespec_word == cts_void)
7201 error ("both %<long%> and %<void%> in "
7202 "declaration specifiers");
7203 else if (specs->typespec_word == cts_bool)
7204 error ("both %<long%> and %<_Bool%> in "
7205 "declaration specifiers");
7206 else if (specs->typespec_word == cts_char)
7207 error ("both %<long%> and %<char%> in "
7208 "declaration specifiers");
7209 else if (specs->typespec_word == cts_float)
7210 error ("both %<long%> and %<float%> in "
7211 "declaration specifiers");
7212 else if (specs->typespec_word == cts_dfloat32)
7213 error ("both %<long%> and %<_Decimal32%> in "
7214 "declaration specifiers");
7215 else if (specs->typespec_word == cts_dfloat64)
7216 error ("both %<long%> and %<_Decimal64%> in "
7217 "declaration specifiers");
7218 else if (specs->typespec_word == cts_dfloat128)
7219 error ("both %<long%> and %<_Decimal128%> in "
7220 "declaration specifiers");
7222 specs->long_p = true;
7225 dupe = specs->short_p;
7227 error ("both %<long%> and %<short%> in "
7228 "declaration specifiers");
7229 else if (specs->typespec_word == cts_void)
7230 error ("both %<short%> and %<void%> in "
7231 "declaration specifiers");
7232 else if (specs->typespec_word == cts_bool)
7233 error ("both %<short%> and %<_Bool%> in "
7234 "declaration specifiers");
7235 else if (specs->typespec_word == cts_char)
7236 error ("both %<short%> and %<char%> in "
7237 "declaration specifiers");
7238 else if (specs->typespec_word == cts_float)
7239 error ("both %<short%> and %<float%> in "
7240 "declaration specifiers");
7241 else if (specs->typespec_word == cts_double)
7242 error ("both %<short%> and %<double%> in "
7243 "declaration specifiers");
7244 else if (specs->typespec_word == cts_dfloat32)
7245 error ("both %<short%> and %<_Decimal32%> in "
7246 "declaration specifiers");
7247 else if (specs->typespec_word == cts_dfloat64)
7248 error ("both %<short%> and %<_Decimal64%> in "
7249 "declaration specifiers");
7250 else if (specs->typespec_word == cts_dfloat128)
7251 error ("both %<short%> and %<_Decimal128%> in "
7252 "declaration specifiers");
7254 specs->short_p = true;
7257 dupe = specs->signed_p;
7258 if (specs->unsigned_p)
7259 error ("both %<signed%> and %<unsigned%> in "
7260 "declaration specifiers");
7261 else if (specs->typespec_word == cts_void)
7262 error ("both %<signed%> and %<void%> in "
7263 "declaration specifiers");
7264 else if (specs->typespec_word == cts_bool)
7265 error ("both %<signed%> and %<_Bool%> in "
7266 "declaration specifiers");
7267 else if (specs->typespec_word == cts_float)
7268 error ("both %<signed%> and %<float%> in "
7269 "declaration specifiers");
7270 else if (specs->typespec_word == cts_double)
7271 error ("both %<signed%> and %<double%> in "
7272 "declaration specifiers");
7273 else if (specs->typespec_word == cts_dfloat32)
7274 error ("both %<signed%> and %<_Decimal32%> in "
7275 "declaration specifiers");
7276 else if (specs->typespec_word == cts_dfloat64)
7277 error ("both %<signed%> and %<_Decimal64%> in "
7278 "declaration specifiers");
7279 else if (specs->typespec_word == cts_dfloat128)
7280 error ("both %<signed%> and %<_Decimal128%> in "
7281 "declaration specifiers");
7283 specs->signed_p = true;
7286 dupe = specs->unsigned_p;
7287 if (specs->signed_p)
7288 error ("both %<signed%> and %<unsigned%> in "
7289 "declaration specifiers");
7290 else if (specs->typespec_word == cts_void)
7291 error ("both %<unsigned%> and %<void%> in "
7292 "declaration specifiers");
7293 else if (specs->typespec_word == cts_bool)
7294 error ("both %<unsigned%> and %<_Bool%> in "
7295 "declaration specifiers");
7296 else if (specs->typespec_word == cts_float)
7297 error ("both %<unsigned%> and %<float%> in "
7298 "declaration specifiers");
7299 else if (specs->typespec_word == cts_double)
7300 error ("both %<unsigned%> and %<double%> in "
7301 "declaration specifiers");
7302 else if (specs->typespec_word == cts_dfloat32)
7303 error ("both %<unsigned%> and %<_Decimal32%> in "
7304 "declaration specifiers");
7305 else if (specs->typespec_word == cts_dfloat64)
7306 error ("both %<unsigned%> and %<_Decimal64%> in "
7307 "declaration specifiers");
7308 else if (specs->typespec_word == cts_dfloat128)
7309 error ("both %<unsigned%> and %<_Decimal128%> in "
7310 "declaration specifiers");
7312 specs->unsigned_p = true;
7315 dupe = specs->complex_p;
7316 if (pedantic && !flag_isoc99 && !in_system_header)
7317 pedwarn ("ISO C90 does not support complex types");
7318 if (specs->typespec_word == cts_void)
7319 error ("both %<complex%> and %<void%> in "
7320 "declaration specifiers");
7321 else if (specs->typespec_word == cts_bool)
7322 error ("both %<complex%> and %<_Bool%> in "
7323 "declaration specifiers");
7324 else if (specs->typespec_word == cts_dfloat32)
7325 error ("both %<complex%> and %<_Decimal32%> in "
7326 "declaration specifiers");
7327 else if (specs->typespec_word == cts_dfloat64)
7328 error ("both %<complex%> and %<_Decimal64%> in "
7329 "declaration specifiers");
7330 else if (specs->typespec_word == cts_dfloat128)
7331 error ("both %<complex%> and %<_Decimal128%> in "
7332 "declaration specifiers");
7334 specs->complex_p = true;
7341 error ("duplicate %qE", type);
7347 /* "void", "_Bool", "char", "int", "float" or "double". */
7348 if (specs->typespec_word != cts_none)
7350 error ("two or more data types in declaration specifiers");
7357 error ("both %<long%> and %<void%> in "
7358 "declaration specifiers");
7359 else if (specs->short_p)
7360 error ("both %<short%> and %<void%> in "
7361 "declaration specifiers");
7362 else if (specs->signed_p)
7363 error ("both %<signed%> and %<void%> in "
7364 "declaration specifiers");
7365 else if (specs->unsigned_p)
7366 error ("both %<unsigned%> and %<void%> in "
7367 "declaration specifiers");
7368 else if (specs->complex_p)
7369 error ("both %<complex%> and %<void%> in "
7370 "declaration specifiers");
7372 specs->typespec_word = cts_void;
7376 error ("both %<long%> and %<_Bool%> in "
7377 "declaration specifiers");
7378 else if (specs->short_p)
7379 error ("both %<short%> and %<_Bool%> in "
7380 "declaration specifiers");
7381 else if (specs->signed_p)
7382 error ("both %<signed%> and %<_Bool%> in "
7383 "declaration specifiers");
7384 else if (specs->unsigned_p)
7385 error ("both %<unsigned%> and %<_Bool%> in "
7386 "declaration specifiers");
7387 else if (specs->complex_p)
7388 error ("both %<complex%> and %<_Bool%> in "
7389 "declaration specifiers");
7391 specs->typespec_word = cts_bool;
7395 error ("both %<long%> and %<char%> in "
7396 "declaration specifiers");
7397 else if (specs->short_p)
7398 error ("both %<short%> and %<char%> in "
7399 "declaration specifiers");
7401 specs->typespec_word = cts_char;
7404 specs->typespec_word = cts_int;
7408 error ("both %<long%> and %<float%> in "
7409 "declaration specifiers");
7410 else if (specs->short_p)
7411 error ("both %<short%> and %<float%> in "
7412 "declaration specifiers");
7413 else if (specs->signed_p)
7414 error ("both %<signed%> and %<float%> in "
7415 "declaration specifiers");
7416 else if (specs->unsigned_p)
7417 error ("both %<unsigned%> and %<float%> in "
7418 "declaration specifiers");
7420 specs->typespec_word = cts_float;
7423 if (specs->long_long_p)
7424 error ("both %<long long%> and %<double%> in "
7425 "declaration specifiers");
7426 else if (specs->short_p)
7427 error ("both %<short%> and %<double%> in "
7428 "declaration specifiers");
7429 else if (specs->signed_p)
7430 error ("both %<signed%> and %<double%> in "
7431 "declaration specifiers");
7432 else if (specs->unsigned_p)
7433 error ("both %<unsigned%> and %<double%> in "
7434 "declaration specifiers");
7436 specs->typespec_word = cts_double;
7443 if (i == RID_DFLOAT32)
7445 else if (i == RID_DFLOAT64)
7448 str = "_Decimal128";
7449 if (specs->long_long_p)
7450 error ("both %<long long%> and %<%s%> in "
7451 "declaration specifiers", str);
7453 error ("both %<long%> and %<%s%> in "
7454 "declaration specifiers", str);
7455 else if (specs->short_p)
7456 error ("both %<short%> and %<%s%> in "
7457 "declaration specifiers", str);
7458 else if (specs->signed_p)
7459 error ("both %<signed%> and %<%s%> in "
7460 "declaration specifiers", str);
7461 else if (specs->unsigned_p)
7462 error ("both %<unsigned%> and %<%s%> in "
7463 "declaration specifiers", str);
7464 else if (specs->complex_p)
7465 error ("both %<complex%> and %<%s%> in "
7466 "declaration specifiers", str);
7467 else if (i == RID_DFLOAT32)
7468 specs->typespec_word = cts_dfloat32;
7469 else if (i == RID_DFLOAT64)
7470 specs->typespec_word = cts_dfloat64;
7472 specs->typespec_word = cts_dfloat128;
7474 if (!targetm.decimal_float_supported_p ())
7475 error ("decimal floating point not supported for this target");
7477 pedwarn ("ISO C does not support decimal floating point");
7480 /* ObjC reserved word "id", handled below. */
7486 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7487 form of ObjC type, cases such as "int" and "long" being handled
7488 above), a TYPE (struct, union, enum and typeof specifiers) or an
7489 ERROR_MARK. In none of these cases may there have previously
7490 been any type specifiers. */
7491 if (specs->type || specs->typespec_word != cts_none
7492 || specs->long_p || specs->short_p || specs->signed_p
7493 || specs->unsigned_p || specs->complex_p)
7494 error ("two or more data types in declaration specifiers");
7495 else if (TREE_CODE (type) == TYPE_DECL)
7497 if (TREE_TYPE (type) == error_mark_node)
7498 ; /* Allow the type to default to int to avoid cascading errors. */
7501 specs->type = TREE_TYPE (type);
7502 specs->decl_attr = DECL_ATTRIBUTES (type);
7503 specs->typedef_p = true;
7504 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7507 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7509 tree t = lookup_name (type);
7510 if (!t || TREE_CODE (t) != TYPE_DECL)
7511 error ("%qE fails to be a typedef or built in type", type);
7512 else if (TREE_TYPE (t) == error_mark_node)
7515 specs->type = TREE_TYPE (t);
7517 else if (TREE_CODE (type) != ERROR_MARK)
7519 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7520 specs->tag_defined_p = true;
7521 if (spec.kind == ctsk_typeof)
7522 specs->typedef_p = true;
7529 /* Add the storage class specifier or function specifier SCSPEC to the
7530 declaration specifiers SPECS, returning SPECS. */
7532 struct c_declspecs *
7533 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7536 enum c_storage_class n = csc_none;
7538 specs->declspecs_seen_p = true;
7539 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7540 && C_IS_RESERVED_WORD (scspec));
7541 i = C_RID_CODE (scspec);
7542 if (extra_warnings && specs->non_sc_seen_p)
7543 warning (OPT_Wextra, "%qE is not at beginning of declaration", scspec);
7547 /* C99 permits duplicate inline. Although of doubtful utility,
7548 it seems simplest to permit it in gnu89 mode as well, as
7549 there is also little utility in maintaining this as a
7550 difference between gnu89 and C99 inline. */
7552 specs->inline_p = true;
7555 dupe = specs->thread_p;
7556 if (specs->storage_class == csc_auto)
7557 error ("%<__thread%> used with %<auto%>");
7558 else if (specs->storage_class == csc_register)
7559 error ("%<__thread%> used with %<register%>");
7560 else if (specs->storage_class == csc_typedef)
7561 error ("%<__thread%> used with %<typedef%>");
7563 specs->thread_p = true;
7570 /* Diagnose "__thread extern". */
7571 if (specs->thread_p)
7572 error ("%<__thread%> before %<extern%>");
7579 /* Diagnose "__thread static". */
7580 if (specs->thread_p)
7581 error ("%<__thread%> before %<static%>");
7589 if (n != csc_none && n == specs->storage_class)
7592 error ("duplicate %qE", scspec);
7595 if (specs->storage_class != csc_none && n != specs->storage_class)
7597 error ("multiple storage classes in declaration specifiers");
7601 specs->storage_class = n;
7602 if (n != csc_extern && n != csc_static && specs->thread_p)
7604 error ("%<__thread%> used with %qE", scspec);
7605 specs->thread_p = false;
7612 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7615 struct c_declspecs *
7616 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7618 specs->attrs = chainon (attrs, specs->attrs);
7619 specs->declspecs_seen_p = true;
7623 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7624 specifiers with any other type specifier to determine the resulting
7625 type. This is where ISO C checks on complex types are made, since
7626 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7629 struct c_declspecs *
7630 finish_declspecs (struct c_declspecs *specs)
7632 /* If a type was specified as a whole, we have no modifiers and are
7634 if (specs->type != NULL_TREE)
7636 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7637 && !specs->signed_p && !specs->unsigned_p
7638 && !specs->complex_p);
7642 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7643 has been specified, treat it as "int" unless "_Complex" is
7644 present and there are no other specifiers. If we just have
7645 "_Complex", it is equivalent to "_Complex double", but e.g.
7646 "_Complex short" is equivalent to "_Complex short int". */
7647 if (specs->typespec_word == cts_none)
7649 if (specs->long_p || specs->short_p
7650 || specs->signed_p || specs->unsigned_p)
7652 specs->typespec_word = cts_int;
7654 else if (specs->complex_p)
7656 specs->typespec_word = cts_double;
7658 pedwarn ("ISO C does not support plain %<complex%> meaning "
7659 "%<double complex%>");
7663 specs->typespec_word = cts_int;
7664 specs->default_int_p = true;
7665 /* We don't diagnose this here because grokdeclarator will
7666 give more specific diagnostics according to whether it is
7667 a function definition. */
7671 /* If "signed" was specified, record this to distinguish "int" and
7672 "signed int" in the case of a bit-field with
7673 -funsigned-bitfields. */
7674 specs->explicit_signed_p = specs->signed_p;
7676 /* Now compute the actual type. */
7677 switch (specs->typespec_word)
7680 gcc_assert (!specs->long_p && !specs->short_p
7681 && !specs->signed_p && !specs->unsigned_p
7682 && !specs->complex_p);
7683 specs->type = void_type_node;
7686 gcc_assert (!specs->long_p && !specs->short_p
7687 && !specs->signed_p && !specs->unsigned_p
7688 && !specs->complex_p);
7689 specs->type = boolean_type_node;
7692 gcc_assert (!specs->long_p && !specs->short_p);
7693 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7694 if (specs->signed_p)
7695 specs->type = signed_char_type_node;
7696 else if (specs->unsigned_p)
7697 specs->type = unsigned_char_type_node;
7699 specs->type = char_type_node;
7700 if (specs->complex_p)
7703 pedwarn ("ISO C does not support complex integer types");
7704 specs->type = build_complex_type (specs->type);
7708 gcc_assert (!(specs->long_p && specs->short_p));
7709 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7710 if (specs->long_long_p)
7711 specs->type = (specs->unsigned_p
7712 ? long_long_unsigned_type_node
7713 : long_long_integer_type_node);
7714 else if (specs->long_p)
7715 specs->type = (specs->unsigned_p
7716 ? long_unsigned_type_node
7717 : long_integer_type_node);
7718 else if (specs->short_p)
7719 specs->type = (specs->unsigned_p
7720 ? short_unsigned_type_node
7721 : short_integer_type_node);
7723 specs->type = (specs->unsigned_p
7724 ? unsigned_type_node
7725 : integer_type_node);
7726 if (specs->complex_p)
7729 pedwarn ("ISO C does not support complex integer types");
7730 specs->type = build_complex_type (specs->type);
7734 gcc_assert (!specs->long_p && !specs->short_p
7735 && !specs->signed_p && !specs->unsigned_p);
7736 specs->type = (specs->complex_p
7737 ? complex_float_type_node
7741 gcc_assert (!specs->long_long_p && !specs->short_p
7742 && !specs->signed_p && !specs->unsigned_p);
7745 specs->type = (specs->complex_p
7746 ? complex_long_double_type_node
7747 : long_double_type_node);
7751 specs->type = (specs->complex_p
7752 ? complex_double_type_node
7753 : double_type_node);
7759 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7760 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
7761 if (specs->typespec_word == cts_dfloat32)
7762 specs->type = dfloat32_type_node;
7763 else if (specs->typespec_word == cts_dfloat64)
7764 specs->type = dfloat64_type_node;
7766 specs->type = dfloat128_type_node;
7775 /* Synthesize a function which calls all the global ctors or global
7776 dtors in this file. This is only used for targets which do not
7777 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7779 build_cdtor (int method_type, tree cdtors)
7786 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7787 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7790 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7793 /* A subroutine of c_write_global_declarations. Perform final processing
7794 on one file scope's declarations (or the external scope's declarations),
7798 c_write_global_declarations_1 (tree globals)
7803 /* Process the decls in the order they were written. */
7804 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7806 /* Check for used but undefined static functions using the C
7807 standard's definition of "used", and set TREE_NO_WARNING so
7808 that check_global_declarations doesn't repeat the check. */
7809 if (TREE_CODE (decl) == FUNCTION_DECL
7810 && DECL_INITIAL (decl) == 0
7811 && DECL_EXTERNAL (decl)
7812 && !TREE_PUBLIC (decl)
7813 && C_DECL_USED (decl))
7815 pedwarn ("%q+F used but never defined", decl);
7816 TREE_NO_WARNING (decl) = 1;
7819 wrapup_global_declaration_1 (decl);
7825 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7826 reconsider |= wrapup_global_declaration_2 (decl);
7830 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7831 check_global_declaration_1 (decl);
7834 /* A subroutine of c_write_global_declarations Emit debug information for each
7835 of the declarations in GLOBALS. */
7838 c_write_global_declarations_2 (tree globals)
7842 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
7843 debug_hooks->global_decl (decl);
7846 /* Preserve the external declarations scope across a garbage collect. */
7847 static GTY(()) tree ext_block;
7850 c_write_global_declarations (void)
7854 /* We don't want to do this if generating a PCH. */
7858 /* Don't waste time on further processing if -fsyntax-only or we've
7859 encountered errors. */
7860 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7863 /* Close the external scope. */
7864 ext_block = pop_scope ();
7866 gcc_assert (!current_scope);
7870 tree tmp = BLOCK_VARS (ext_block);
7872 FILE * stream = dump_begin (TDI_tu, &flags);
7875 dump_node (tmp, flags & ~TDF_SLIM, stream);
7876 dump_end (TDI_tu, stream);
7880 /* Process all file scopes in this compilation, and the external_scope,
7881 through wrapup_global_declarations and check_global_declarations. */
7882 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7883 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7884 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7886 /* Generate functions to call static constructors and destructors
7887 for targets that do not support .ctors/.dtors sections. These
7888 functions have magic names which are detected by collect2. */
7889 build_cdtor ('I', static_ctors); static_ctors = 0;
7890 build_cdtor ('D', static_dtors); static_dtors = 0;
7892 /* We're done parsing; proceed to optimize and emit assembly.
7893 FIXME: shouldn't be the front end's responsibility to call this. */
7896 /* After cgraph has had a chance to emit everything that's going to
7897 be emitted, output debug information for globals. */
7898 if (errorcount == 0 && sorrycount == 0)
7900 timevar_push (TV_SYMOUT);
7901 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7902 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
7903 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
7904 timevar_pop (TV_SYMOUT);
7910 #include "gt-c-decl.h"