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, 2006, 2007 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) */
73 /* States indicating how grokdeclarator() should handle declspecs marked
74 with __attribute__((deprecated)). An object declared as
75 __attribute__((deprecated)) suppresses warnings of uses of other
78 enum deprecated_states {
84 /* Nonzero if we have seen an invalid cross reference
85 to a struct, union, or enum, but not yet printed the message. */
86 tree pending_invalid_xref;
88 /* File and line to appear in the eventual error message. */
89 location_t pending_invalid_xref_location;
91 /* True means we've initialized exception handling. */
92 bool c_eh_initialized_p;
94 /* The file and line that the prototype came from if this is an
95 old-style definition; used for diagnostics in
96 store_parm_decls_oldstyle. */
98 static location_t current_function_prototype_locus;
100 /* Whether this prototype was built-in. */
102 static bool current_function_prototype_built_in;
104 /* The argument type information of this prototype. */
106 static tree current_function_prototype_arg_types;
108 /* The argument information structure for the function currently being
111 static struct c_arg_info *current_function_arg_info;
113 /* The obstack on which parser and related data structures, which are
114 not live beyond their top-level declaration or definition, are
116 struct obstack parser_obstack;
118 /* The current statement tree. */
120 static GTY(()) struct stmt_tree_s c_stmt_tree;
122 /* State saving variables. */
126 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
127 included in this invocation. Note that the current translation
128 unit is not included in this list. */
130 static GTY(()) tree all_translation_units;
132 /* A list of decls to be made automatically visible in each file scope. */
133 static GTY(()) tree visible_builtins;
135 /* Set to 0 at beginning of a function definition, set to 1 if
136 a return statement that specifies a return value is seen. */
138 int current_function_returns_value;
140 /* Set to 0 at beginning of a function definition, set to 1 if
141 a return statement with no argument is seen. */
143 int current_function_returns_null;
145 /* Set to 0 at beginning of a function definition, set to 1 if
146 a call to a noreturn function is seen. */
148 int current_function_returns_abnormally;
150 /* Set to nonzero by `grokdeclarator' for a function
151 whose return type is defaulted, if warnings for this are desired. */
153 static int warn_about_return_type;
155 /* Nonzero when the current toplevel function contains a declaration
156 of a nested function which is never defined. */
158 static bool undef_nested_function;
160 /* True means global_bindings_p should return false even if the scope stack
161 says we are in file scope. */
162 bool c_override_global_bindings_to_false;
165 /* Each c_binding structure describes one binding of an identifier to
166 a decl. All the decls in a scope - irrespective of namespace - are
167 chained together by the ->prev field, which (as the name implies)
168 runs in reverse order. All the decls in a given namespace bound to
169 a given identifier are chained by the ->shadowed field, which runs
170 from inner to outer scopes.
172 The ->decl field usually points to a DECL node, but there are two
173 exceptions. In the namespace of type tags, the bound entity is a
174 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
175 identifier is encountered, it is bound to error_mark_node to
176 suppress further errors about that identifier in the current
179 The ->type field stores the type of the declaration in this scope;
180 if NULL, the type is the type of the ->decl field. This is only of
181 relevance for objects with external or internal linkage which may
182 be redeclared in inner scopes, forming composite types that only
183 persist for the duration of those scopes. In the external scope,
184 this stores the composite of all the types declared for this
185 object, visible or not. The ->inner_comp field (used only at file
186 scope) stores whether an incomplete array type at file scope was
187 completed at an inner scope to an array size other than 1.
189 The depth field is copied from the scope structure that holds this
190 decl. It is used to preserve the proper ordering of the ->shadowed
191 field (see bind()) and also for a handful of special-case checks.
192 Finally, the invisible bit is true for a decl which should be
193 ignored for purposes of normal name lookup, and the nested bit is
194 true for a decl that's been bound a second time in an inner scope;
195 in all such cases, the binding in the outer scope will have its
196 invisible bit true. */
198 struct c_binding GTY((chain_next ("%h.prev")))
200 tree decl; /* the decl bound */
201 tree type; /* the type in this scope */
202 tree id; /* the identifier it's bound to */
203 struct c_binding *prev; /* the previous decl in this scope */
204 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
205 unsigned int depth : 28; /* depth of this scope */
206 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
207 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
208 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
211 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
212 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
213 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
214 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
216 #define I_SYMBOL_BINDING(node) \
217 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
218 #define I_SYMBOL_DECL(node) \
219 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
221 #define I_TAG_BINDING(node) \
222 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
223 #define I_TAG_DECL(node) \
224 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
226 #define I_LABEL_BINDING(node) \
227 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
228 #define I_LABEL_DECL(node) \
229 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
231 /* Each C symbol points to three linked lists of c_binding structures.
232 These describe the values of the identifier in the three different
233 namespaces defined by the language. */
235 struct lang_identifier GTY(())
237 struct c_common_identifier common_id;
238 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
239 struct c_binding *tag_binding; /* struct/union/enum tags */
240 struct c_binding *label_binding; /* labels */
243 /* Validate c-lang.c's assumptions. */
244 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
245 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
247 /* The resulting tree type. */
250 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
251 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) GENERIC_NEXT (&%h.generic))")))
253 union tree_node GTY ((tag ("0"),
254 desc ("tree_node_structure (&%h)")))
256 struct lang_identifier GTY ((tag ("1"))) identifier;
259 /* Each c_scope structure describes the complete contents of one
260 scope. Four scopes are distinguished specially: the innermost or
261 current scope, the innermost function scope, the file scope (always
262 the second to outermost) and the outermost or external scope.
264 Most declarations are recorded in the current scope.
266 All normal label declarations are recorded in the innermost
267 function scope, as are bindings of undeclared identifiers to
268 error_mark_node. (GCC permits nested functions as an extension,
269 hence the 'innermost' qualifier.) Explicitly declared labels
270 (using the __label__ extension) appear in the current scope.
272 Being in the file scope (current_scope == file_scope) causes
273 special behavior in several places below. Also, under some
274 conditions the Objective-C front end records declarations in the
275 file scope even though that isn't the current scope.
277 All declarations with external linkage are recorded in the external
278 scope, even if they aren't visible there; this models the fact that
279 such declarations are visible to the entire program, and (with a
280 bit of cleverness, see pushdecl) allows diagnosis of some violations
281 of C99 6.2.2p7 and 6.2.7p2:
283 If, within the same translation unit, the same identifier appears
284 with both internal and external linkage, the behavior is
287 All declarations that refer to the same object or function shall
288 have compatible type; otherwise, the behavior is undefined.
290 Initially only the built-in declarations, which describe compiler
291 intrinsic functions plus a subset of the standard library, are in
294 The order of the blocks list matters, and it is frequently appended
295 to. To avoid having to walk all the way to the end of the list on
296 each insertion, or reverse the list later, we maintain a pointer to
297 the last list entry. (FIXME: It should be feasible to use a reversed
300 The bindings list is strictly in reverse order of declarations;
301 pop_scope relies on this. */
304 struct c_scope GTY((chain_next ("%h.outer")))
306 /* The scope containing this one. */
307 struct c_scope *outer;
309 /* The next outermost function scope. */
310 struct c_scope *outer_function;
312 /* All bindings in this scope. */
313 struct c_binding *bindings;
315 /* For each scope (except the global one), a chain of BLOCK nodes
316 for all the scopes that were entered and exited one level down. */
320 /* The depth of this scope. Used to keep the ->shadowed chain of
321 bindings sorted innermost to outermost. */
322 unsigned int depth : 28;
324 /* True if we are currently filling this scope with parameter
326 BOOL_BITFIELD parm_flag : 1;
328 /* True if we saw [*] in this scope. Used to give an error messages
329 if these appears in a function definition. */
330 BOOL_BITFIELD had_vla_unspec : 1;
332 /* True if we already complained about forward parameter decls
333 in this scope. This prevents double warnings on
334 foo (int a; int b; ...) */
335 BOOL_BITFIELD warned_forward_parm_decls : 1;
337 /* True if this is the outermost block scope of a function body.
338 This scope contains the parameters, the local variables declared
339 in the outermost block, and all the labels (except those in
340 nested functions, or declared at block scope with __label__). */
341 BOOL_BITFIELD function_body : 1;
343 /* True means make a BLOCK for this scope no matter what. */
344 BOOL_BITFIELD keep : 1;
347 /* The scope currently in effect. */
349 static GTY(()) struct c_scope *current_scope;
351 /* The innermost function scope. Ordinary (not explicitly declared)
352 labels, bindings to error_mark_node, and the lazily-created
353 bindings of __func__ and its friends get this scope. */
355 static GTY(()) struct c_scope *current_function_scope;
357 /* The C file scope. This is reset for each input translation unit. */
359 static GTY(()) struct c_scope *file_scope;
361 /* The outermost scope. This is used for all declarations with
362 external linkage, and only these, hence the name. */
364 static GTY(()) struct c_scope *external_scope;
366 /* A chain of c_scope structures awaiting reuse. */
368 static GTY((deletable)) struct c_scope *scope_freelist;
370 /* A chain of c_binding structures awaiting reuse. */
372 static GTY((deletable)) struct c_binding *binding_freelist;
374 /* Append VAR to LIST in scope SCOPE. */
375 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
376 struct c_scope *s_ = (scope); \
378 if (s_->list##_last) \
379 TREE_CHAIN (s_->list##_last) = d_; \
382 s_->list##_last = d_; \
385 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
386 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
387 struct c_scope *t_ = (tscope); \
388 struct c_scope *f_ = (fscope); \
390 TREE_CHAIN (t_->to##_last) = f_->from; \
393 t_->to##_last = f_->from##_last; \
396 /* True means unconditionally make a BLOCK for the next scope pushed. */
398 static bool keep_next_level_flag;
400 /* True means the next call to push_scope will be the outermost scope
401 of a function body, so do not push a new scope, merely cease
402 expecting parameter decls. */
404 static bool next_is_function_body;
406 /* Forward declarations. */
407 static tree lookup_name_in_scope (tree, struct c_scope *);
408 static tree c_make_fname_decl (tree, int);
409 static tree grokdeclarator (const struct c_declarator *,
410 struct c_declspecs *,
411 enum decl_context, bool, tree *,
412 enum deprecated_states);
413 static tree grokparms (struct c_arg_info *, bool);
414 static void layout_array_type (tree);
416 /* T is a statement. Add it to the statement-tree. This is the
417 C/ObjC version--C++ has a slightly different version of this
423 enum tree_code code = TREE_CODE (t);
425 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
427 if (!EXPR_HAS_LOCATION (t))
428 SET_EXPR_LOCATION (t, input_location);
431 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
432 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
434 /* Add T to the statement-tree. Non-side-effect statements need to be
435 recorded during statement expressions. */
436 append_to_statement_list_force (t, &cur_stmt_list);
443 c_print_identifier (FILE *file, tree node, int indent)
445 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
446 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
447 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
448 if (C_IS_RESERVED_WORD (node))
450 tree rid = ridpointers[C_RID_CODE (node)];
451 indent_to (file, indent + 4);
452 fprintf (file, "rid %p \"%s\"",
453 (void *) rid, IDENTIFIER_POINTER (rid));
457 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
458 which may be any of several kinds of DECL or TYPE or error_mark_node,
459 in the scope SCOPE. */
461 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
463 struct c_binding *b, **here;
465 if (binding_freelist)
467 b = binding_freelist;
468 binding_freelist = b->prev;
471 b = GGC_NEW (struct c_binding);
476 b->depth = scope->depth;
477 b->invisible = invisible;
483 b->prev = scope->bindings;
489 switch (TREE_CODE (decl))
491 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
494 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
500 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
506 /* Locate the appropriate place in the chain of shadowed decls
507 to insert this binding. Normally, scope == current_scope and
508 this does nothing. */
509 while (*here && (*here)->depth > scope->depth)
510 here = &(*here)->shadowed;
516 /* Clear the binding structure B, stick it on the binding_freelist,
517 and return the former value of b->prev. This is used by pop_scope
518 and get_parm_info to iterate destructively over all the bindings
519 from a given scope. */
520 static struct c_binding *
521 free_binding_and_advance (struct c_binding *b)
523 struct c_binding *prev = b->prev;
525 memset (b, 0, sizeof (struct c_binding));
526 b->prev = binding_freelist;
527 binding_freelist = b;
533 /* Hook called at end of compilation to assume 1 elt
534 for a file-scope tentative array defn that wasn't complete before. */
537 c_finish_incomplete_decl (tree decl)
539 if (TREE_CODE (decl) == VAR_DECL)
541 tree type = TREE_TYPE (decl);
542 if (type != error_mark_node
543 && TREE_CODE (type) == ARRAY_TYPE
544 && !DECL_EXTERNAL (decl)
545 && TYPE_DOMAIN (type) == 0)
547 warning (0, "array %q+D assumed to have one element", decl);
549 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
551 layout_decl (decl, 0);
556 /* The Objective-C front-end often needs to determine the current scope. */
559 objc_get_current_scope (void)
561 return current_scope;
564 /* The following function is used only by Objective-C. It needs to live here
565 because it accesses the innards of c_scope. */
568 objc_mark_locals_volatile (void *enclosing_blk)
570 struct c_scope *scope;
573 for (scope = current_scope;
574 scope && scope != enclosing_blk;
575 scope = scope->outer)
577 for (b = scope->bindings; b; b = b->prev)
578 objc_volatilize_decl (b->decl);
580 /* Do not climb up past the current function. */
581 if (scope->function_body)
586 /* Nonzero if we are currently in file scope. */
589 global_bindings_p (void)
591 return current_scope == file_scope && !c_override_global_bindings_to_false;
595 keep_next_level (void)
597 keep_next_level_flag = true;
600 /* Identify this scope as currently being filled with parameters. */
603 declare_parm_level (void)
605 current_scope->parm_flag = true;
611 if (next_is_function_body)
613 /* This is the transition from the parameters to the top level
614 of the function body. These are the same scope
615 (C99 6.2.1p4,6) so we do not push another scope structure.
616 next_is_function_body is set only by store_parm_decls, which
617 in turn is called when and only when we are about to
618 encounter the opening curly brace for the function body.
620 The outermost block of a function always gets a BLOCK node,
621 because the debugging output routines expect that each
622 function has at least one BLOCK. */
623 current_scope->parm_flag = false;
624 current_scope->function_body = true;
625 current_scope->keep = true;
626 current_scope->outer_function = current_function_scope;
627 current_function_scope = current_scope;
629 keep_next_level_flag = false;
630 next_is_function_body = false;
634 struct c_scope *scope;
637 scope = scope_freelist;
638 scope_freelist = scope->outer;
641 scope = GGC_CNEW (struct c_scope);
643 scope->keep = keep_next_level_flag;
644 scope->outer = current_scope;
645 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
647 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
649 if (current_scope && scope->depth == 0)
652 sorry ("GCC supports only %u nested scopes", scope->depth);
655 current_scope = scope;
656 keep_next_level_flag = false;
660 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
663 set_type_context (tree type, tree context)
665 for (type = TYPE_MAIN_VARIANT (type); type;
666 type = TYPE_NEXT_VARIANT (type))
667 TYPE_CONTEXT (type) = context;
670 /* Exit a scope. Restore the state of the identifier-decl mappings
671 that were in effect when this scope was entered. Return a BLOCK
672 node containing all the DECLs in this scope that are of interest
673 to debug info generation. */
678 struct c_scope *scope = current_scope;
679 tree block, context, p;
682 bool functionbody = scope->function_body;
683 bool keep = functionbody || scope->keep || scope->bindings;
685 c_end_vm_scope (scope->depth);
687 /* If appropriate, create a BLOCK to record the decls for the life
692 block = make_node (BLOCK);
693 BLOCK_SUBBLOCKS (block) = scope->blocks;
694 TREE_USED (block) = 1;
696 /* In each subblock, record that this is its superior. */
697 for (p = scope->blocks; p; p = TREE_CHAIN (p))
698 BLOCK_SUPERCONTEXT (p) = block;
700 BLOCK_VARS (block) = 0;
703 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
704 scope must be set so that they point to the appropriate
705 construct, i.e. either to the current FUNCTION_DECL node, or
706 else to the BLOCK node we just constructed.
708 Note that for tagged types whose scope is just the formal
709 parameter list for some function type specification, we can't
710 properly set their TYPE_CONTEXTs here, because we don't have a
711 pointer to the appropriate FUNCTION_TYPE node readily available
712 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
713 type nodes get set in `grokdeclarator' as soon as we have created
714 the FUNCTION_TYPE node which will represent the "scope" for these
715 "parameter list local" tagged types. */
716 if (scope->function_body)
717 context = current_function_decl;
718 else if (scope == file_scope)
720 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
721 TREE_CHAIN (file_decl) = all_translation_units;
722 all_translation_units = file_decl;
728 /* Clear all bindings in this scope. */
729 for (b = scope->bindings; b; b = free_binding_and_advance (b))
732 switch (TREE_CODE (p))
735 /* Warnings for unused labels, errors for undefined labels. */
736 if (TREE_USED (p) && !DECL_INITIAL (p))
738 error ("label %q+D used but not defined", p);
739 DECL_INITIAL (p) = error_mark_node;
742 warn_for_unused_label (p);
744 /* Labels go in BLOCK_VARS. */
745 TREE_CHAIN (p) = BLOCK_VARS (block);
746 BLOCK_VARS (block) = p;
747 gcc_assert (I_LABEL_BINDING (b->id) == b);
748 I_LABEL_BINDING (b->id) = b->shadowed;
754 set_type_context (p, context);
756 /* Types may not have tag-names, in which case the type
757 appears in the bindings list with b->id NULL. */
760 gcc_assert (I_TAG_BINDING (b->id) == b);
761 I_TAG_BINDING (b->id) = b->shadowed;
766 /* Propagate TREE_ADDRESSABLE from nested functions to their
767 containing functions. */
768 if (!TREE_ASM_WRITTEN (p)
769 && DECL_INITIAL (p) != 0
770 && TREE_ADDRESSABLE (p)
771 && DECL_ABSTRACT_ORIGIN (p) != 0
772 && DECL_ABSTRACT_ORIGIN (p) != p)
773 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
774 if (!DECL_EXTERNAL (p)
776 && scope != file_scope
777 && scope != external_scope)
779 error ("nested function %q+D declared but never defined", p);
780 undef_nested_function = true;
782 /* C99 6.7.4p6: "a function with external linkage... declared
783 with an inline function specifier ... shall also be defined in the
784 same translation unit." */
785 else if (DECL_DECLARED_INLINE_P (p)
788 && !flag_gnu89_inline)
789 pedwarn ("inline function %q+D declared but never defined", p);
794 /* Warnings for unused variables. */
796 && !TREE_NO_WARNING (p)
797 && !DECL_IN_SYSTEM_HEADER (p)
799 && !DECL_ARTIFICIAL (p)
800 && scope != file_scope
801 && scope != external_scope)
802 warning (OPT_Wunused_variable, "unused variable %q+D", p);
806 error ("type of array %q+D completed incompatibly with"
807 " implicit initialization", p);
814 /* All of these go in BLOCK_VARS, but only if this is the
815 binding in the home scope. */
818 TREE_CHAIN (p) = BLOCK_VARS (block);
819 BLOCK_VARS (block) = p;
821 /* If this is the file scope, and we are processing more
822 than one translation unit in this compilation, set
823 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
824 This makes same_translation_unit_p work, and causes
825 static declarations to be given disambiguating suffixes. */
826 if (scope == file_scope && num_in_fnames > 1)
828 DECL_CONTEXT (p) = context;
829 if (TREE_CODE (p) == TYPE_DECL)
830 set_type_context (TREE_TYPE (p), context);
834 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
835 already been put there by store_parm_decls. Unused-
836 parameter warnings are handled by function.c.
837 error_mark_node obviously does not go in BLOCK_VARS and
838 does not get unused-variable warnings. */
841 /* It is possible for a decl not to have a name. We get
842 here with b->id NULL in this case. */
845 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
846 I_SYMBOL_BINDING (b->id) = b->shadowed;
847 if (b->shadowed && b->shadowed->type)
848 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
858 /* Dispose of the block that we just made inside some higher level. */
859 if ((scope->function_body || scope == file_scope) && context)
861 DECL_INITIAL (context) = block;
862 BLOCK_SUPERCONTEXT (block) = context;
864 else if (scope->outer)
867 SCOPE_LIST_APPEND (scope->outer, blocks, block);
868 /* If we did not make a block for the scope just exited, any
869 blocks made for inner scopes must be carried forward so they
870 will later become subblocks of something else. */
871 else if (scope->blocks)
872 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
875 /* Pop the current scope, and free the structure for reuse. */
876 current_scope = scope->outer;
877 if (scope->function_body)
878 current_function_scope = scope->outer_function;
880 memset (scope, 0, sizeof (struct c_scope));
881 scope->outer = scope_freelist;
882 scope_freelist = scope;
888 push_file_scope (void)
896 file_scope = current_scope;
898 start_fname_decls ();
900 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
901 bind (DECL_NAME (decl), decl, file_scope,
902 /*invisible=*/false, /*nested=*/true);
906 pop_file_scope (void)
908 /* In case there were missing closebraces, get us back to the global
910 while (current_scope != file_scope)
913 /* __FUNCTION__ is defined at file scope (""). This
914 call may not be necessary as my tests indicate it
915 still works without it. */
916 finish_fname_decls ();
918 /* This is the point to write out a PCH if we're doing that.
919 In that case we do not want to do anything else. */
922 c_common_write_pch ();
926 /* Pop off the file scope and close this translation unit. */
930 maybe_apply_pending_pragma_weaks ();
931 cgraph_finalize_compilation_unit ();
934 /* Insert BLOCK at the end of the list of subblocks of the current
935 scope. This is used when a BIND_EXPR is expanded, to handle the
936 BLOCK node inside the BIND_EXPR. */
939 insert_block (tree block)
941 TREE_USED (block) = 1;
942 SCOPE_LIST_APPEND (current_scope, blocks, block);
945 /* Push a definition or a declaration of struct, union or enum tag "name".
946 "type" should be the type node.
947 We assume that the tag "name" is not already defined.
949 Note that the definition may really be just a forward reference.
950 In that case, the TYPE_SIZE will be zero. */
953 pushtag (tree name, tree type)
955 /* Record the identifier as the type's name if it has none. */
956 if (name && !TYPE_NAME (type))
957 TYPE_NAME (type) = name;
958 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
960 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
961 tagged type we just added to the current scope. This fake
962 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
963 to output a representation of a tagged type, and it also gives
964 us a convenient place to record the "scope start" address for the
967 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
969 /* An approximation for now, so we can tell this is a function-scope tag.
970 This will be updated in pop_scope. */
971 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
974 /* Subroutine of compare_decls. Allow harmless mismatches in return
975 and argument types provided that the type modes match. This function
976 return a unified type given a suitable match, and 0 otherwise. */
979 match_builtin_function_types (tree newtype, tree oldtype)
981 tree newrettype, oldrettype;
982 tree newargs, oldargs;
983 tree trytype, tryargs;
985 /* Accept the return type of the new declaration if same modes. */
986 oldrettype = TREE_TYPE (oldtype);
987 newrettype = TREE_TYPE (newtype);
989 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
992 oldargs = TYPE_ARG_TYPES (oldtype);
993 newargs = TYPE_ARG_TYPES (newtype);
996 while (oldargs || newargs)
1000 || !TREE_VALUE (oldargs)
1001 || !TREE_VALUE (newargs)
1002 || TYPE_MODE (TREE_VALUE (oldargs))
1003 != TYPE_MODE (TREE_VALUE (newargs)))
1006 oldargs = TREE_CHAIN (oldargs);
1007 newargs = TREE_CHAIN (newargs);
1010 trytype = build_function_type (newrettype, tryargs);
1011 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1014 /* Subroutine of diagnose_mismatched_decls. Check for function type
1015 mismatch involving an empty arglist vs a nonempty one and give clearer
1018 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1019 tree newtype, tree oldtype)
1023 if (TREE_CODE (olddecl) != FUNCTION_DECL
1024 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1025 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1027 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1030 t = TYPE_ARG_TYPES (oldtype);
1032 t = TYPE_ARG_TYPES (newtype);
1033 for (; t; t = TREE_CHAIN (t))
1035 tree type = TREE_VALUE (t);
1037 if (TREE_CHAIN (t) == 0
1038 && TYPE_MAIN_VARIANT (type) != void_type_node)
1040 inform ("a parameter list with an ellipsis can%'t match "
1041 "an empty parameter name list declaration");
1045 if (c_type_promotes_to (type) != type)
1047 inform ("an argument type that has a default promotion can%'t match "
1048 "an empty parameter name list declaration");
1054 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1055 old-style function definition, NEWDECL is a prototype declaration.
1056 Diagnose inconsistencies in the argument list. Returns TRUE if
1057 the prototype is compatible, FALSE if not. */
1059 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1061 tree newargs, oldargs;
1064 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1066 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1067 newargs = TYPE_ARG_TYPES (newtype);
1072 tree oldargtype = TREE_VALUE (oldargs);
1073 tree newargtype = TREE_VALUE (newargs);
1075 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1078 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1079 newargtype = TYPE_MAIN_VARIANT (newargtype);
1081 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1084 /* Reaching the end of just one list means the two decls don't
1085 agree on the number of arguments. */
1086 if (END_OF_ARGLIST (oldargtype))
1088 error ("prototype for %q+D declares more arguments "
1089 "than previous old-style definition", newdecl);
1092 else if (END_OF_ARGLIST (newargtype))
1094 error ("prototype for %q+D declares fewer arguments "
1095 "than previous old-style definition", newdecl);
1099 /* Type for passing arg must be consistent with that declared
1101 else if (!comptypes (oldargtype, newargtype))
1103 error ("prototype for %q+D declares argument %d"
1104 " with incompatible type",
1109 oldargs = TREE_CHAIN (oldargs);
1110 newargs = TREE_CHAIN (newargs);
1114 /* If we get here, no errors were found, but do issue a warning
1115 for this poor-style construct. */
1116 warning (0, "prototype for %q+D follows non-prototype definition",
1119 #undef END_OF_ARGLIST
1122 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1123 first in a pair of mismatched declarations, using the diagnostic
1126 locate_old_decl (tree decl, void (*diag)(const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2))
1128 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1130 else if (DECL_INITIAL (decl))
1131 diag (G_("previous definition of %q+D was here"), decl);
1132 else if (C_DECL_IMPLICIT (decl))
1133 diag (G_("previous implicit declaration of %q+D was here"), decl);
1135 diag (G_("previous declaration of %q+D was here"), decl);
1138 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1139 Returns true if the caller should proceed to merge the two, false
1140 if OLDDECL should simply be discarded. As a side effect, issues
1141 all necessary diagnostics for invalid or poor-style combinations.
1142 If it returns true, writes the types of NEWDECL and OLDDECL to
1143 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1144 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1147 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1148 tree *newtypep, tree *oldtypep)
1150 tree newtype, oldtype;
1151 bool pedwarned = false;
1152 bool warned = false;
1155 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1156 && DECL_EXTERNAL (DECL))
1158 /* If we have error_mark_node for either decl or type, just discard
1159 the previous decl - we're in an error cascade already. */
1160 if (olddecl == error_mark_node || newdecl == error_mark_node)
1162 *oldtypep = oldtype = TREE_TYPE (olddecl);
1163 *newtypep = newtype = TREE_TYPE (newdecl);
1164 if (oldtype == error_mark_node || newtype == error_mark_node)
1167 /* Two different categories of symbol altogether. This is an error
1168 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1169 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1171 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1172 && DECL_BUILT_IN (olddecl)
1173 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1175 error ("%q+D redeclared as different kind of symbol", newdecl);
1176 locate_old_decl (olddecl, error);
1178 else if (TREE_PUBLIC (newdecl))
1179 warning (0, "built-in function %q+D declared as non-function",
1182 warning (OPT_Wshadow, "declaration of %q+D shadows "
1183 "a built-in function", newdecl);
1187 /* Enumerators have no linkage, so may only be declared once in a
1189 if (TREE_CODE (olddecl) == CONST_DECL)
1191 error ("redeclaration of enumerator %q+D", newdecl);
1192 locate_old_decl (olddecl, error);
1196 if (!comptypes (oldtype, newtype))
1198 if (TREE_CODE (olddecl) == FUNCTION_DECL
1199 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1201 /* Accept harmless mismatch in function types.
1202 This is for the ffs and fprintf builtins. */
1203 tree trytype = match_builtin_function_types (newtype, oldtype);
1205 if (trytype && comptypes (newtype, trytype))
1206 *oldtypep = oldtype = trytype;
1209 /* If types don't match for a built-in, throw away the
1210 built-in. No point in calling locate_old_decl here, it
1211 won't print anything. */
1212 warning (0, "conflicting types for built-in function %q+D",
1217 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1218 && DECL_IS_BUILTIN (olddecl))
1220 /* A conflicting function declaration for a predeclared
1221 function that isn't actually built in. Objective C uses
1222 these. The new declaration silently overrides everything
1223 but the volatility (i.e. noreturn) indication. See also
1224 below. FIXME: Make Objective C use normal builtins. */
1225 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1228 /* Permit void foo (...) to match int foo (...) if the latter is
1229 the definition and implicit int was used. See
1230 c-torture/compile/920625-2.c. */
1231 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1232 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1233 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1234 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1236 pedwarn ("conflicting types for %q+D", newdecl);
1237 /* Make sure we keep void as the return type. */
1238 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1239 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1242 /* Permit void foo (...) to match an earlier call to foo (...) with
1243 no declared type (thus, implicitly int). */
1244 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1245 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1246 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1247 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1249 pedwarn ("conflicting types for %q+D", newdecl);
1250 /* Make sure we keep void as the return type. */
1251 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1256 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1257 error ("conflicting type qualifiers for %q+D", newdecl);
1259 error ("conflicting types for %q+D", newdecl);
1260 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1261 locate_old_decl (olddecl, error);
1266 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1267 but silently ignore the redeclaration if either is in a system
1268 header. (Conflicting redeclarations were handled above.) */
1269 if (TREE_CODE (newdecl) == TYPE_DECL)
1271 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1272 return true; /* Allow OLDDECL to continue in use. */
1274 error ("redefinition of typedef %q+D", newdecl);
1275 locate_old_decl (olddecl, error);
1279 /* Function declarations can either be 'static' or 'extern' (no
1280 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1281 can never conflict with each other on account of linkage
1282 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1283 gnu89 mode permits two definitions if one is 'extern inline' and
1284 one is not. The non- extern-inline definition supersedes the
1285 extern-inline definition. */
1287 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1289 /* If you declare a built-in function name as static, or
1290 define the built-in with an old-style definition (so we
1291 can't validate the argument list) the built-in definition is
1292 overridden, but optionally warn this was a bad choice of name. */
1293 if (DECL_BUILT_IN (olddecl)
1294 && !C_DECL_DECLARED_BUILTIN (olddecl)
1295 && (!TREE_PUBLIC (newdecl)
1296 || (DECL_INITIAL (newdecl)
1297 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1299 warning (OPT_Wshadow, "declaration of %q+D shadows "
1300 "a built-in function", newdecl);
1301 /* Discard the old built-in function. */
1305 if (DECL_INITIAL (newdecl))
1307 if (DECL_INITIAL (olddecl))
1309 /* If both decls are in the same TU and the new declaration
1310 isn't overriding an extern inline reject the new decl.
1311 In c99, no overriding is allowed in the same translation
1313 if ((!DECL_EXTERN_INLINE (olddecl)
1314 || DECL_EXTERN_INLINE (newdecl)
1315 || (!flag_gnu89_inline
1316 && (!DECL_DECLARED_INLINE_P (olddecl)
1317 || !lookup_attribute ("gnu_inline",
1318 DECL_ATTRIBUTES (olddecl)))
1319 && (!DECL_DECLARED_INLINE_P (newdecl)
1320 || !lookup_attribute ("gnu_inline",
1321 DECL_ATTRIBUTES (newdecl))))
1323 && same_translation_unit_p (newdecl, olddecl))
1325 error ("redefinition of %q+D", newdecl);
1326 locate_old_decl (olddecl, error);
1331 /* If we have a prototype after an old-style function definition,
1332 the argument types must be checked specially. */
1333 else if (DECL_INITIAL (olddecl)
1334 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1335 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1336 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1338 locate_old_decl (olddecl, error);
1341 /* A non-static declaration (even an "extern") followed by a
1342 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1343 The same is true for a static forward declaration at block
1344 scope followed by a non-static declaration/definition at file
1345 scope. Static followed by non-static at the same scope is
1346 not undefined behavior, and is the most convenient way to get
1347 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1348 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1349 we do diagnose it if -Wtraditional. */
1350 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1352 /* Two exceptions to the rule. If olddecl is an extern
1353 inline, or a predeclared function that isn't actually
1354 built in, newdecl silently overrides olddecl. The latter
1355 occur only in Objective C; see also above. (FIXME: Make
1356 Objective C use normal builtins.) */
1357 if (!DECL_IS_BUILTIN (olddecl)
1358 && !DECL_EXTERN_INLINE (olddecl))
1360 error ("static declaration of %q+D follows "
1361 "non-static declaration", newdecl);
1362 locate_old_decl (olddecl, error);
1366 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1368 if (DECL_CONTEXT (olddecl))
1370 error ("non-static declaration of %q+D follows "
1371 "static declaration", newdecl);
1372 locate_old_decl (olddecl, error);
1375 else if (warn_traditional)
1377 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1378 "follows static declaration", newdecl);
1383 /* Make sure gnu_inline attribute is either not present, or
1384 present on all inline decls. */
1385 if (DECL_DECLARED_INLINE_P (olddecl)
1386 && DECL_DECLARED_INLINE_P (newdecl))
1388 bool newa = lookup_attribute ("gnu_inline",
1389 DECL_ATTRIBUTES (newdecl)) != NULL;
1390 bool olda = lookup_attribute ("gnu_inline",
1391 DECL_ATTRIBUTES (olddecl)) != NULL;
1394 error ("%<gnu_inline%> attribute present on %q+D",
1395 newa ? newdecl : olddecl);
1396 error ("%Jbut not here", newa ? olddecl : newdecl);
1400 else if (TREE_CODE (newdecl) == VAR_DECL)
1402 /* Only variables can be thread-local, and all declarations must
1403 agree on this property. */
1404 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1406 /* Nothing to check. Since OLDDECL is marked threadprivate
1407 and NEWDECL does not have a thread-local attribute, we
1408 will merge the threadprivate attribute into NEWDECL. */
1411 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1413 if (DECL_THREAD_LOCAL_P (newdecl))
1414 error ("thread-local declaration of %q+D follows "
1415 "non-thread-local declaration", newdecl);
1417 error ("non-thread-local declaration of %q+D follows "
1418 "thread-local declaration", newdecl);
1420 locate_old_decl (olddecl, error);
1424 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1425 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1427 error ("redefinition of %q+D", newdecl);
1428 locate_old_decl (olddecl, error);
1432 /* Objects declared at file scope: if the first declaration had
1433 external linkage (even if it was an external reference) the
1434 second must have external linkage as well, or the behavior is
1435 undefined. If the first declaration had internal linkage, then
1436 the second must too, or else be an external reference (in which
1437 case the composite declaration still has internal linkage).
1438 As for function declarations, we warn about the static-then-
1439 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1440 if (DECL_FILE_SCOPE_P (newdecl)
1441 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1443 if (DECL_EXTERNAL (newdecl))
1445 if (!DECL_FILE_SCOPE_P (olddecl))
1447 error ("extern declaration of %q+D follows "
1448 "declaration with no linkage", newdecl);
1449 locate_old_decl (olddecl, error);
1452 else if (warn_traditional)
1454 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1455 "follows static declaration", newdecl);
1461 if (TREE_PUBLIC (newdecl))
1462 error ("non-static declaration of %q+D follows "
1463 "static declaration", newdecl);
1465 error ("static declaration of %q+D follows "
1466 "non-static declaration", newdecl);
1468 locate_old_decl (olddecl, error);
1472 /* Two objects with the same name declared at the same block
1473 scope must both be external references (6.7p3). */
1474 else if (!DECL_FILE_SCOPE_P (newdecl))
1476 if (DECL_EXTERNAL (newdecl))
1478 /* Extern with initializer at block scope, which will
1479 already have received an error. */
1481 else if (DECL_EXTERNAL (olddecl))
1483 error ("declaration of %q+D with no linkage follows "
1484 "extern declaration", newdecl);
1485 locate_old_decl (olddecl, error);
1489 error ("redeclaration of %q+D with no linkage", newdecl);
1490 locate_old_decl (olddecl, error);
1498 /* All decls must agree on a visibility. */
1499 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
1500 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1501 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1503 warning (0, "redeclaration of %q+D with different visibility "
1504 "(old visibility preserved)", newdecl);
1508 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1510 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1511 if (DECL_DECLARED_INLINE_P (newdecl)
1512 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1514 warning (OPT_Wattributes, "inline declaration of %qD follows "
1515 "declaration with attribute noinline", newdecl);
1518 else if (DECL_DECLARED_INLINE_P (olddecl)
1519 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1521 warning (OPT_Wattributes, "declaration of %q+D with attribute "
1522 "noinline follows inline declaration ", newdecl);
1526 /* Inline declaration after use or definition.
1527 ??? Should we still warn about this now we have unit-at-a-time
1528 mode and can get it right?
1529 Definitely don't complain if the decls are in different translation
1531 C99 permits this, so don't warn in that case. (The function
1532 may not be inlined everywhere in function-at-a-time mode, but
1533 we still shouldn't warn.) */
1534 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1535 && same_translation_unit_p (olddecl, newdecl)
1536 && flag_gnu89_inline)
1538 if (TREE_USED (olddecl))
1540 warning (0, "%q+D declared inline after being called", olddecl);
1543 else if (DECL_INITIAL (olddecl))
1545 warning (0, "%q+D declared inline after its definition", olddecl);
1550 else /* PARM_DECL, VAR_DECL */
1552 /* Redeclaration of a parameter is a constraint violation (this is
1553 not explicitly stated, but follows from C99 6.7p3 [no more than
1554 one declaration of the same identifier with no linkage in the
1555 same scope, except type tags] and 6.2.2p6 [parameters have no
1556 linkage]). We must check for a forward parameter declaration,
1557 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1558 an extension, the mandatory diagnostic for which is handled by
1559 mark_forward_parm_decls. */
1561 if (TREE_CODE (newdecl) == PARM_DECL
1562 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1564 error ("redefinition of parameter %q+D", newdecl);
1565 locate_old_decl (olddecl, error);
1570 /* Optional warning for completely redundant decls. */
1571 if (!warned && !pedwarned
1572 && warn_redundant_decls
1573 /* Don't warn about a function declaration followed by a
1575 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1576 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1577 /* Don't warn about redundant redeclarations of builtins. */
1578 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1579 && !DECL_BUILT_IN (newdecl)
1580 && DECL_BUILT_IN (olddecl)
1581 && !C_DECL_DECLARED_BUILTIN (olddecl))
1582 /* Don't warn about an extern followed by a definition. */
1583 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1584 /* Don't warn about forward parameter decls. */
1585 && !(TREE_CODE (newdecl) == PARM_DECL
1586 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1587 /* Don't warn about a variable definition following a declaration. */
1588 && !(TREE_CODE (newdecl) == VAR_DECL
1589 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
1591 warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
1596 /* Report location of previous decl/defn in a consistent manner. */
1597 if (warned || pedwarned)
1598 locate_old_decl (olddecl, pedwarned ? pedwarn : warning0);
1600 #undef DECL_EXTERN_INLINE
1605 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1606 consistent with OLDDECL, but carries new information. Merge the
1607 new information into OLDDECL. This function issues no
1611 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1613 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1614 && DECL_INITIAL (newdecl) != 0);
1615 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
1616 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
1617 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
1618 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
1619 bool extern_changed = false;
1621 /* For real parm decl following a forward decl, rechain the old decl
1622 in its new location and clear TREE_ASM_WRITTEN (it's not a
1623 forward decl anymore). */
1624 if (TREE_CODE (newdecl) == PARM_DECL
1625 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1627 struct c_binding *b, **here;
1629 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1630 if ((*here)->decl == olddecl)
1637 b->prev = current_scope->bindings;
1638 current_scope->bindings = b;
1640 TREE_ASM_WRITTEN (olddecl) = 0;
1643 DECL_ATTRIBUTES (newdecl)
1644 = targetm.merge_decl_attributes (olddecl, newdecl);
1646 /* Merge the data types specified in the two decls. */
1648 = TREE_TYPE (olddecl)
1649 = composite_type (newtype, oldtype);
1651 /* Lay the type out, unless already done. */
1652 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1654 if (TREE_TYPE (newdecl) != error_mark_node)
1655 layout_type (TREE_TYPE (newdecl));
1656 if (TREE_CODE (newdecl) != FUNCTION_DECL
1657 && TREE_CODE (newdecl) != TYPE_DECL
1658 && TREE_CODE (newdecl) != CONST_DECL)
1659 layout_decl (newdecl, 0);
1663 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1664 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1665 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1666 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1667 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1669 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1670 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1675 /* Merge the type qualifiers. */
1676 if (TREE_READONLY (newdecl))
1677 TREE_READONLY (olddecl) = 1;
1679 if (TREE_THIS_VOLATILE (newdecl))
1680 TREE_THIS_VOLATILE (olddecl) = 1;
1682 /* Merge deprecatedness. */
1683 if (TREE_DEPRECATED (newdecl))
1684 TREE_DEPRECATED (olddecl) = 1;
1686 /* Keep source location of definition rather than declaration and of
1687 prototype rather than non-prototype unless that prototype is
1689 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1690 || (old_is_prototype && !new_is_prototype
1691 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1692 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1694 /* Merge the initialization information. */
1695 if (DECL_INITIAL (newdecl) == 0)
1696 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1698 /* Merge the threadprivate attribute. */
1699 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
1701 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1702 C_DECL_THREADPRIVATE_P (newdecl) = 1;
1705 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1707 /* Merge the unused-warning information. */
1708 if (DECL_IN_SYSTEM_HEADER (olddecl))
1709 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1710 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1711 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1713 /* Merge the section attribute.
1714 We want to issue an error if the sections conflict but that
1715 must be done later in decl_attributes since we are called
1716 before attributes are assigned. */
1717 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1718 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1720 /* Copy the assembler name.
1721 Currently, it can only be defined in the prototype. */
1722 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1724 /* Use visibility of whichever declaration had it specified */
1725 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1727 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1728 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1731 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1733 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1734 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1735 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1736 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1737 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1738 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1739 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1740 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1741 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1742 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1745 /* Merge the storage class information. */
1746 merge_weak (newdecl, olddecl);
1748 /* For functions, static overrides non-static. */
1749 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1751 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1752 /* This is since we don't automatically
1753 copy the attributes of NEWDECL into OLDDECL. */
1754 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1755 /* If this clears `static', clear it in the identifier too. */
1756 if (!TREE_PUBLIC (olddecl))
1757 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1761 /* In c99, 'extern' declaration before (or after) 'inline' means this
1762 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1764 if (TREE_CODE (newdecl) == FUNCTION_DECL
1765 && !flag_gnu89_inline
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)
1772 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (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 if (warn_implicit_function_declaration)
2350 pedwarn (G_("implicit declaration of function %qE"), id);
2352 warning (OPT_Wimplicit_function_declaration,
2353 G_("implicit declaration of function %qE"), id);
2355 locate_old_decl (olddecl, inform);
2359 /* Generate an implicit declaration for identifier FUNCTIONID as a
2360 function of type int (). */
2363 implicitly_declare (tree functionid)
2365 struct c_binding *b;
2369 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2371 if (B_IN_SCOPE (b, external_scope))
2380 if (decl == error_mark_node)
2383 /* FIXME: Objective-C has weird not-really-builtin functions
2384 which are supposed to be visible automatically. They wind up
2385 in the external scope because they're pushed before the file
2386 scope gets created. Catch this here and rebind them into the
2388 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2390 bind (functionid, decl, file_scope,
2391 /*invisible=*/false, /*nested=*/true);
2396 tree newtype = default_function_type;
2398 TREE_TYPE (decl) = b->type;
2399 /* Implicit declaration of a function already declared
2400 (somehow) in a different scope, or as a built-in.
2401 If this is the first time this has happened, warn;
2402 then recycle the old declaration but with the new type. */
2403 if (!C_DECL_IMPLICIT (decl))
2405 implicit_decl_warning (functionid, decl);
2406 C_DECL_IMPLICIT (decl) = 1;
2408 if (DECL_BUILT_IN (decl))
2410 newtype = build_type_attribute_variant (newtype,
2412 (TREE_TYPE (decl)));
2413 if (!comptypes (newtype, TREE_TYPE (decl)))
2415 warning (0, "incompatible implicit declaration of built-in"
2416 " function %qD", decl);
2417 newtype = TREE_TYPE (decl);
2422 if (!comptypes (newtype, TREE_TYPE (decl)))
2424 error ("incompatible implicit declaration of function %qD",
2426 locate_old_decl (decl, error);
2429 b->type = TREE_TYPE (decl);
2430 TREE_TYPE (decl) = newtype;
2431 bind (functionid, decl, current_scope,
2432 /*invisible=*/false, /*nested=*/true);
2437 /* Not seen before. */
2438 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2439 DECL_EXTERNAL (decl) = 1;
2440 TREE_PUBLIC (decl) = 1;
2441 C_DECL_IMPLICIT (decl) = 1;
2442 implicit_decl_warning (functionid, 0);
2443 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2445 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2447 /* C89 says implicit declarations are in the innermost block.
2448 So we record the decl in the standard fashion. */
2449 decl = pushdecl (decl);
2451 /* No need to call objc_check_decl here - it's a function type. */
2452 rest_of_decl_compilation (decl, 0, 0);
2454 /* Write a record describing this implicit function declaration
2455 to the prototypes file (if requested). */
2456 gen_aux_info_record (decl, 0, 1, 0);
2458 /* Possibly apply some default attributes to this implicit declaration. */
2459 decl_attributes (&decl, NULL_TREE, 0);
2464 /* Issue an error message for a reference to an undeclared variable
2465 ID, including a reference to a builtin outside of function-call
2466 context. Establish a binding of the identifier to error_mark_node
2467 in an appropriate scope, which will suppress further errors for the
2468 same identifier. The error message should be given location LOC. */
2470 undeclared_variable (tree id, location_t loc)
2472 static bool already = false;
2473 struct c_scope *scope;
2475 if (current_function_decl == 0)
2477 error ("%H%qE undeclared here (not in a function)", &loc, id);
2478 scope = current_scope;
2482 error ("%H%qE undeclared (first use in this function)", &loc, id);
2486 error ("%H(Each undeclared identifier is reported only once", &loc);
2487 error ("%Hfor each function it appears in.)", &loc);
2491 /* If we are parsing old-style parameter decls, current_function_decl
2492 will be nonnull but current_function_scope will be null. */
2493 scope = current_function_scope ? current_function_scope : current_scope;
2495 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2498 /* Subroutine of lookup_label, declare_label, define_label: construct a
2499 LABEL_DECL with all the proper frills. */
2502 make_label (tree name, location_t location)
2504 tree label = build_decl (LABEL_DECL, name, void_type_node);
2506 DECL_CONTEXT (label) = current_function_decl;
2507 DECL_MODE (label) = VOIDmode;
2508 DECL_SOURCE_LOCATION (label) = location;
2513 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2514 Create one if none exists so far for the current function.
2515 This is called when a label is used in a goto expression or
2516 has its address taken. */
2519 lookup_label (tree name)
2523 if (current_function_decl == 0)
2525 error ("label %qE referenced outside of any function", name);
2529 /* Use a label already defined or ref'd with this name, but not if
2530 it is inherited from a containing function and wasn't declared
2532 label = I_LABEL_DECL (name);
2533 if (label && (DECL_CONTEXT (label) == current_function_decl
2534 || C_DECLARED_LABEL_FLAG (label)))
2536 /* If the label has only been declared, update its apparent
2537 location to point here, for better diagnostics if it
2538 turns out not to have been defined. */
2539 if (!TREE_USED (label))
2540 DECL_SOURCE_LOCATION (label) = input_location;
2544 /* No label binding for that identifier; make one. */
2545 label = make_label (name, input_location);
2547 /* Ordinary labels go in the current function scope. */
2548 bind (name, label, current_function_scope,
2549 /*invisible=*/false, /*nested=*/false);
2553 /* Make a label named NAME in the current function, shadowing silently
2554 any that may be inherited from containing functions or containing
2555 scopes. This is called for __label__ declarations. */
2558 declare_label (tree name)
2560 struct c_binding *b = I_LABEL_BINDING (name);
2563 /* Check to make sure that the label hasn't already been declared
2565 if (b && B_IN_CURRENT_SCOPE (b))
2567 error ("duplicate label declaration %qE", name);
2568 locate_old_decl (b->decl, error);
2570 /* Just use the previous declaration. */
2574 label = make_label (name, input_location);
2575 C_DECLARED_LABEL_FLAG (label) = 1;
2577 /* Declared labels go in the current scope. */
2578 bind (name, label, current_scope,
2579 /*invisible=*/false, /*nested=*/false);
2583 /* Define a label, specifying the location in the source file.
2584 Return the LABEL_DECL node for the label, if the definition is valid.
2585 Otherwise return 0. */
2588 define_label (location_t location, tree name)
2590 /* Find any preexisting label with this name. It is an error
2591 if that label has already been defined in this function, or
2592 if there is a containing function with a declared label with
2594 tree label = I_LABEL_DECL (name);
2595 struct c_label_list *nlist_se, *nlist_vm;
2598 && ((DECL_CONTEXT (label) == current_function_decl
2599 && DECL_INITIAL (label) != 0)
2600 || (DECL_CONTEXT (label) != current_function_decl
2601 && C_DECLARED_LABEL_FLAG (label))))
2603 error ("%Hduplicate label %qD", &location, label);
2604 locate_old_decl (label, error);
2607 else if (label && DECL_CONTEXT (label) == current_function_decl)
2609 /* The label has been used or declared already in this function,
2610 but not defined. Update its location to point to this
2612 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2613 error ("%Jjump into statement expression", label);
2614 if (C_DECL_UNDEFINABLE_VM (label))
2615 error ("%Jjump into scope of identifier with variably modified type",
2617 DECL_SOURCE_LOCATION (label) = location;
2621 /* No label binding for that identifier; make one. */
2622 label = make_label (name, location);
2624 /* Ordinary labels go in the current function scope. */
2625 bind (name, label, current_function_scope,
2626 /*invisible=*/false, /*nested=*/false);
2629 if (!in_system_header && lookup_name (name))
2630 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2631 "for labels, identifier %qE conflicts", &location, name);
2633 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2634 nlist_se->next = label_context_stack_se->labels_def;
2635 nlist_se->label = label;
2636 label_context_stack_se->labels_def = nlist_se;
2638 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2639 nlist_vm->next = label_context_stack_vm->labels_def;
2640 nlist_vm->label = label;
2641 label_context_stack_vm->labels_def = nlist_vm;
2643 /* Mark label as having been defined. */
2644 DECL_INITIAL (label) = error_mark_node;
2648 /* Given NAME, an IDENTIFIER_NODE,
2649 return the structure (or union or enum) definition for that name.
2650 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2651 CODE says which kind of type the caller wants;
2652 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2653 If the wrong kind of type is found, an error is reported. */
2656 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2658 struct c_binding *b = I_TAG_BINDING (name);
2664 /* We only care about whether it's in this level if
2665 thislevel_only was set or it might be a type clash. */
2666 if (thislevel_only || TREE_CODE (b->decl) != code)
2668 /* For our purposes, a tag in the external scope is the same as
2669 a tag in the file scope. (Primarily relevant to Objective-C
2670 and its builtin structure tags, which get pushed before the
2671 file scope is created.) */
2672 if (B_IN_CURRENT_SCOPE (b)
2673 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2677 if (thislevel_only && !thislevel)
2680 if (TREE_CODE (b->decl) != code)
2682 /* Definition isn't the kind we were looking for. */
2683 pending_invalid_xref = name;
2684 pending_invalid_xref_location = input_location;
2686 /* If in the same binding level as a declaration as a tag
2687 of a different type, this must not be allowed to
2688 shadow that tag, so give the error immediately.
2689 (For example, "struct foo; union foo;" is invalid.) */
2691 pending_xref_error ();
2696 /* Print an error message now
2697 for a recent invalid struct, union or enum cross reference.
2698 We don't print them immediately because they are not invalid
2699 when used in the `struct foo;' construct for shadowing. */
2702 pending_xref_error (void)
2704 if (pending_invalid_xref != 0)
2705 error ("%H%qE defined as wrong kind of tag",
2706 &pending_invalid_xref_location, pending_invalid_xref);
2707 pending_invalid_xref = 0;
2711 /* Look up NAME in the current scope and its superiors
2712 in the namespace of variables, functions and typedefs.
2713 Return a ..._DECL node of some kind representing its definition,
2714 or return 0 if it is undefined. */
2717 lookup_name (tree name)
2719 struct c_binding *b = I_SYMBOL_BINDING (name);
2720 if (b && !b->invisible)
2725 /* Similar to `lookup_name' but look only at the indicated scope. */
2728 lookup_name_in_scope (tree name, struct c_scope *scope)
2730 struct c_binding *b;
2732 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2733 if (B_IN_SCOPE (b, scope))
2738 /* Create the predefined scalar types of C,
2739 and some nodes representing standard constants (0, 1, (void *) 0).
2740 Initialize the global scope.
2741 Make definitions for built-in primitive functions. */
2744 c_init_decl_processing (void)
2746 location_t save_loc = input_location;
2748 /* Initialize reserved words for parser. */
2751 current_function_decl = 0;
2753 gcc_obstack_init (&parser_obstack);
2755 /* Make the externals scope. */
2757 external_scope = current_scope;
2759 /* Declarations from c_common_nodes_and_builtins must not be associated
2760 with this input file, lest we get differences between using and not
2761 using preprocessed headers. */
2762 #ifdef USE_MAPPED_LOCATION
2763 input_location = BUILTINS_LOCATION;
2765 input_location.file = "<built-in>";
2766 input_location.line = 0;
2769 build_common_tree_nodes (flag_signed_char, false);
2771 c_common_nodes_and_builtins ();
2773 /* In C, comparisons and TRUTH_* expressions have type int. */
2774 truthvalue_type_node = integer_type_node;
2775 truthvalue_true_node = integer_one_node;
2776 truthvalue_false_node = integer_zero_node;
2778 /* Even in C99, which has a real boolean type. */
2779 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2780 boolean_type_node));
2782 input_location = save_loc;
2784 pedantic_lvalues = true;
2786 make_fname_decl = c_make_fname_decl;
2787 start_fname_decls ();
2790 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2791 decl, NAME is the initialization string and TYPE_DEP indicates whether
2792 NAME depended on the type of the function. As we don't yet implement
2793 delayed emission of static data, we mark the decl as emitted
2794 so it is not placed in the output. Anything using it must therefore pull
2795 out the STRING_CST initializer directly. FIXME. */
2798 c_make_fname_decl (tree id, int type_dep)
2800 const char *name = fname_as_string (type_dep);
2801 tree decl, type, init;
2802 size_t length = strlen (name);
2804 type = build_array_type (char_type_node,
2805 build_index_type (size_int (length)));
2806 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2808 decl = build_decl (VAR_DECL, id, type);
2810 TREE_STATIC (decl) = 1;
2811 TREE_READONLY (decl) = 1;
2812 DECL_ARTIFICIAL (decl) = 1;
2814 init = build_string (length + 1, name);
2815 free ((char *) name);
2816 TREE_TYPE (init) = type;
2817 DECL_INITIAL (decl) = init;
2819 TREE_USED (decl) = 1;
2821 if (current_function_decl
2822 /* For invalid programs like this:
2825 const char* p = __FUNCTION__;
2827 the __FUNCTION__ is believed to appear in K&R style function
2828 parameter declarator. In that case we still don't have
2830 && (!errorcount || current_function_scope))
2832 DECL_CONTEXT (decl) = current_function_decl;
2833 bind (id, decl, current_function_scope,
2834 /*invisible=*/false, /*nested=*/false);
2837 finish_decl (decl, init, NULL_TREE);
2843 c_builtin_function (tree decl)
2845 tree type = TREE_TYPE (decl);
2846 tree id = DECL_NAME (decl);
2848 const char *name = IDENTIFIER_POINTER (id);
2849 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2850 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2852 /* Should never be called on a symbol with a preexisting meaning. */
2853 gcc_assert (!I_SYMBOL_BINDING (id));
2855 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2857 /* Builtins in the implementation namespace are made visible without
2858 needing to be explicitly declared. See push_file_scope. */
2859 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2861 TREE_CHAIN (decl) = visible_builtins;
2862 visible_builtins = decl;
2868 /* Called when a declaration is seen that contains no names to declare.
2869 If its type is a reference to a structure, union or enum inherited
2870 from a containing scope, shadow that tag name for the current scope
2871 with a forward reference.
2872 If its type defines a new named structure or union
2873 or defines an enum, it is valid but we need not do anything here.
2874 Otherwise, it is an error. */
2877 shadow_tag (const struct c_declspecs *declspecs)
2879 shadow_tag_warned (declspecs, 0);
2882 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2885 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2887 bool found_tag = false;
2889 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2891 tree value = declspecs->type;
2892 enum tree_code code = TREE_CODE (value);
2894 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2895 /* Used to test also that TYPE_SIZE (value) != 0.
2896 That caused warning for `struct foo;' at top level in the file. */
2898 tree name = TYPE_NAME (value);
2905 if (warned != 1 && code != ENUMERAL_TYPE)
2906 /* Empty unnamed enum OK */
2908 pedwarn ("unnamed struct/union that defines no instances");
2912 else if (!declspecs->tag_defined_p
2913 && declspecs->storage_class != csc_none)
2916 pedwarn ("empty declaration with storage class specifier "
2917 "does not redeclare tag");
2919 pending_xref_error ();
2921 else if (!declspecs->tag_defined_p
2922 && (declspecs->const_p
2923 || declspecs->volatile_p
2924 || declspecs->restrict_p))
2927 pedwarn ("empty declaration with type qualifier "
2928 "does not redeclare tag");
2930 pending_xref_error ();
2934 pending_invalid_xref = 0;
2935 t = lookup_tag (code, name, 1);
2939 t = make_node (code);
2946 if (warned != 1 && !in_system_header)
2948 pedwarn ("useless type name in empty declaration");
2953 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2955 pedwarn ("useless type name in empty declaration");
2959 pending_invalid_xref = 0;
2961 if (declspecs->inline_p)
2963 error ("%<inline%> in empty declaration");
2967 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2969 error ("%<auto%> in file-scope empty declaration");
2973 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2975 error ("%<register%> in file-scope empty declaration");
2979 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2981 warning (0, "useless storage class specifier in empty declaration");
2985 if (!warned && !in_system_header && declspecs->thread_p)
2987 warning (0, "useless %<__thread%> in empty declaration");
2991 if (!warned && !in_system_header && (declspecs->const_p
2992 || declspecs->volatile_p
2993 || declspecs->restrict_p))
2995 warning (0, "useless type qualifier in empty declaration");
3002 pedwarn ("empty declaration");
3007 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3008 bits. SPECS represents declaration specifiers that the grammar
3009 only permits to contain type qualifiers and attributes. */
3012 quals_from_declspecs (const struct c_declspecs *specs)
3014 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3015 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3016 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
3017 gcc_assert (!specs->type
3018 && !specs->decl_attr
3019 && specs->typespec_word == cts_none
3020 && specs->storage_class == csc_none
3021 && !specs->typedef_p
3022 && !specs->explicit_signed_p
3023 && !specs->deprecated_p
3025 && !specs->long_long_p
3028 && !specs->unsigned_p
3029 && !specs->complex_p
3031 && !specs->thread_p);
3035 /* Construct an array declarator. EXPR is the expression inside [],
3036 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3037 applied to the pointer to which a parameter array is converted).
3038 STATIC_P is true if "static" is inside the [], false otherwise.
3039 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3040 length which is nevertheless a complete type, false otherwise. The
3041 field for the contained declarator is left to be filled in by
3042 set_array_declarator_inner. */
3044 struct c_declarator *
3045 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3048 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3049 struct c_declarator);
3050 declarator->kind = cdk_array;
3051 declarator->declarator = 0;
3052 declarator->u.array.dimen = expr;
3055 declarator->u.array.attrs = quals->attrs;
3056 declarator->u.array.quals = quals_from_declspecs (quals);
3060 declarator->u.array.attrs = NULL_TREE;
3061 declarator->u.array.quals = 0;
3063 declarator->u.array.static_p = static_p;
3064 declarator->u.array.vla_unspec_p = vla_unspec_p;
3065 if (pedantic && !flag_isoc99)
3067 if (static_p || quals != NULL)
3068 pedwarn ("ISO C90 does not support %<static%> or type "
3069 "qualifiers in parameter array declarators");
3071 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3075 if (!current_scope->parm_flag)
3078 error ("%<[*]%> not allowed in other than function prototype scope");
3079 declarator->u.array.vla_unspec_p = false;
3082 current_scope->had_vla_unspec = true;
3087 /* Set the contained declarator of an array declarator. DECL is the
3088 declarator, as constructed by build_array_declarator; INNER is what
3089 appears on the left of the []. ABSTRACT_P is true if it is an
3090 abstract declarator, false otherwise; this is used to reject static
3091 and type qualifiers in abstract declarators, where they are not in
3092 the C99 grammar (subject to possible change in DR#289). */
3094 struct c_declarator *
3095 set_array_declarator_inner (struct c_declarator *decl,
3096 struct c_declarator *inner, bool abstract_p)
3098 decl->declarator = inner;
3099 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
3100 || decl->u.array.attrs != NULL_TREE
3101 || decl->u.array.static_p))
3102 error ("static or type qualifiers in abstract declarator");
3106 /* INIT is a constructor that forms DECL's initializer. If the final
3107 element initializes a flexible array field, add the size of that
3108 initializer to DECL's size. */
3111 add_flexible_array_elts_to_size (tree decl, tree init)
3115 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3118 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3119 type = TREE_TYPE (elt);
3120 if (TREE_CODE (type) == ARRAY_TYPE
3121 && TYPE_SIZE (type) == NULL_TREE
3122 && TYPE_DOMAIN (type) != NULL_TREE
3123 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3125 complete_array_type (&type, elt, false);
3127 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3128 DECL_SIZE_UNIT (decl)
3129 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3133 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3136 groktypename (struct c_type_name *type_name)
3139 tree attrs = type_name->specs->attrs;
3141 type_name->specs->attrs = NULL_TREE;
3143 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3144 false, NULL, DEPRECATED_NORMAL);
3146 /* Apply attributes. */
3147 decl_attributes (&type, attrs, 0);
3152 /* Decode a declarator in an ordinary declaration or data definition.
3153 This is called as soon as the type information and variable name
3154 have been parsed, before parsing the initializer if any.
3155 Here we create the ..._DECL node, fill in its type,
3156 and put it on the list of decls for the current context.
3157 The ..._DECL node is returned as the value.
3159 Exception: for arrays where the length is not specified,
3160 the type is left null, to be filled in by `finish_decl'.
3162 Function definitions do not come here; they go to start_function
3163 instead. However, external and forward declarations of functions
3164 do go through here. Structure field declarations are done by
3165 grokfield and not through here. */
3168 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3169 bool initialized, tree attributes)
3173 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
3175 /* An object declared as __attribute__((deprecated)) suppresses
3176 warnings of uses of other deprecated items. */
3177 if (lookup_attribute ("deprecated", attributes))
3178 deprecated_state = DEPRECATED_SUPPRESS;
3180 decl = grokdeclarator (declarator, declspecs,
3181 NORMAL, initialized, NULL,
3186 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3187 && MAIN_NAME_P (DECL_NAME (decl)))
3188 warning (OPT_Wmain, "%q+D is usually a function", decl);
3191 /* Is it valid for this decl to have an initializer at all?
3192 If not, set INITIALIZED to zero, which will indirectly
3193 tell 'finish_decl' to ignore the initializer once it is parsed. */
3194 switch (TREE_CODE (decl))
3197 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3202 error ("function %qD is initialized like a variable", decl);
3207 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3208 error ("parameter %qD is initialized", decl);
3213 /* Don't allow initializations for incomplete types except for
3214 arrays which might be completed by the initialization. */
3216 /* This can happen if the array size is an undefined macro.
3217 We already gave a warning, so we don't need another one. */
3218 if (TREE_TYPE (decl) == error_mark_node)
3220 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3222 /* A complete type is ok if size is fixed. */
3224 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3225 || C_DECL_VARIABLE_SIZE (decl))
3227 error ("variable-sized object may not be initialized");
3231 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3233 error ("variable %qD has initializer but incomplete type", decl);
3236 else if (C_DECL_VARIABLE_SIZE (decl))
3238 /* Although C99 is unclear about whether incomplete arrays
3239 of VLAs themselves count as VLAs, it does not make
3240 sense to permit them to be initialized given that
3241 ordinary VLAs may not be initialized. */
3242 error ("variable-sized object may not be initialized");
3249 if (current_scope == file_scope)
3250 TREE_STATIC (decl) = 1;
3252 /* Tell 'pushdecl' this is an initialized decl
3253 even though we don't yet have the initializer expression.
3254 Also tell 'finish_decl' it may store the real initializer. */
3255 DECL_INITIAL (decl) = error_mark_node;
3258 /* If this is a function declaration, write a record describing it to the
3259 prototypes file (if requested). */
3261 if (TREE_CODE (decl) == FUNCTION_DECL)
3262 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3264 /* ANSI specifies that a tentative definition which is not merged with
3265 a non-tentative definition behaves exactly like a definition with an
3266 initializer equal to zero. (Section 3.7.2)
3268 -fno-common gives strict ANSI behavior, though this tends to break
3269 a large body of code that grew up without this rule.
3271 Thread-local variables are never common, since there's no entrenched
3272 body of code to break, and it allows more efficient variable references
3273 in the presence of dynamic linking. */
3275 if (TREE_CODE (decl) == VAR_DECL
3277 && TREE_PUBLIC (decl)
3278 && !DECL_THREAD_LOCAL_P (decl)
3280 DECL_COMMON (decl) = 1;
3282 /* Set attributes here so if duplicate decl, will have proper attributes. */
3283 decl_attributes (&decl, attributes, 0);
3285 /* Handle gnu_inline attribute. */
3286 if (declspecs->inline_p
3287 && !flag_gnu89_inline
3288 && TREE_CODE (decl) == FUNCTION_DECL
3289 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl)))
3291 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
3293 else if (declspecs->storage_class != csc_static)
3294 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
3297 if (TREE_CODE (decl) == FUNCTION_DECL
3298 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3300 struct c_declarator *ce = declarator;
3302 if (ce->kind == cdk_pointer)
3303 ce = declarator->declarator;
3304 if (ce->kind == cdk_function)
3306 tree args = ce->u.arg_info->parms;
3307 for (; args; args = TREE_CHAIN (args))
3309 tree type = TREE_TYPE (args);
3310 if (type && INTEGRAL_TYPE_P (type)
3311 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3312 DECL_ARG_TYPE (args) = integer_type_node;
3317 if (TREE_CODE (decl) == FUNCTION_DECL
3318 && DECL_DECLARED_INLINE_P (decl)
3319 && DECL_UNINLINABLE (decl)
3320 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3321 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3324 /* C99 6.7.4p3: An inline definition of a function with external
3325 linkage shall not contain a definition of a modifiable object
3326 with static storage duration... */
3327 if (TREE_CODE (decl) == VAR_DECL
3328 && current_scope != file_scope
3329 && TREE_STATIC (decl)
3330 && DECL_DECLARED_INLINE_P (current_function_decl)
3331 && DECL_EXTERNAL (current_function_decl))
3332 pedwarn ("%q+D is static but declared in inline function %qD "
3333 "which is not static", decl, current_function_decl);
3335 /* Add this decl to the current scope.
3336 TEM may equal DECL or it may be a previous decl of the same name. */
3337 tem = pushdecl (decl);
3339 if (initialized && DECL_EXTERNAL (tem))
3341 DECL_EXTERNAL (tem) = 0;
3342 TREE_STATIC (tem) = 1;
3348 /* Initialize EH if not initialized yet and exceptions are enabled. */
3351 c_maybe_initialize_eh (void)
3353 if (!flag_exceptions || c_eh_initialized_p)
3356 c_eh_initialized_p = true;
3357 eh_personality_libfunc
3358 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3359 ? "__gcc_personality_sj0"
3360 : "__gcc_personality_v0");
3361 default_init_unwind_resume_libfunc ();
3362 using_eh_for_cleanups ();
3365 /* Finish processing of a declaration;
3366 install its initial value.
3367 If the length of an array type is not known before,
3368 it must be determined now, from the initial value, or it is an error. */
3371 finish_decl (tree decl, tree init, tree asmspec_tree)
3374 int was_incomplete = (DECL_SIZE (decl) == 0);
3375 const char *asmspec = 0;
3377 /* If a name was specified, get the string. */
3378 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3379 && DECL_FILE_SCOPE_P (decl))
3380 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3382 asmspec = TREE_STRING_POINTER (asmspec_tree);
3384 /* If `start_decl' didn't like having an initialization, ignore it now. */
3385 if (init != 0 && DECL_INITIAL (decl) == 0)
3388 /* Don't crash if parm is initialized. */
3389 if (TREE_CODE (decl) == PARM_DECL)
3393 store_init_value (decl, init);
3395 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3396 || TREE_CODE (decl) == FUNCTION_DECL
3397 || TREE_CODE (decl) == FIELD_DECL))
3398 objc_check_decl (decl);
3400 type = TREE_TYPE (decl);
3402 /* Deduce size of array from initialization, if not already known. */
3403 if (TREE_CODE (type) == ARRAY_TYPE
3404 && TYPE_DOMAIN (type) == 0
3405 && TREE_CODE (decl) != TYPE_DECL)
3408 = (TREE_STATIC (decl)
3409 /* Even if pedantic, an external linkage array
3410 may have incomplete type at first. */
3411 ? pedantic && !TREE_PUBLIC (decl)
3412 : !DECL_EXTERNAL (decl));
3414 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3417 /* Get the completed type made by complete_array_type. */
3418 type = TREE_TYPE (decl);
3423 error ("initializer fails to determine size of %q+D", decl);
3428 error ("array size missing in %q+D", decl);
3429 /* If a `static' var's size isn't known,
3430 make it extern as well as static, so it does not get
3432 If it is not `static', then do not mark extern;
3433 finish_incomplete_decl will give it a default size
3434 and it will get allocated. */
3435 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3436 DECL_EXTERNAL (decl) = 1;
3440 error ("zero or negative size array %q+D", decl);
3444 /* For global variables, update the copy of the type that
3445 exists in the binding. */
3446 if (TREE_PUBLIC (decl))
3448 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3449 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3450 b_ext = b_ext->shadowed;
3454 b_ext->type = composite_type (b_ext->type, type);
3465 if (DECL_INITIAL (decl))
3466 TREE_TYPE (DECL_INITIAL (decl)) = type;
3468 layout_decl (decl, 0);
3471 if (TREE_CODE (decl) == VAR_DECL)
3473 if (init && TREE_CODE (init) == CONSTRUCTOR)
3474 add_flexible_array_elts_to_size (decl, init);
3476 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3477 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3478 layout_decl (decl, 0);
3480 if (DECL_SIZE (decl) == 0
3481 /* Don't give an error if we already gave one earlier. */
3482 && TREE_TYPE (decl) != error_mark_node
3483 && (TREE_STATIC (decl)
3484 /* A static variable with an incomplete type
3485 is an error if it is initialized.
3486 Also if it is not file scope.
3487 Otherwise, let it through, but if it is not `extern'
3488 then it may cause an error message later. */
3489 ? (DECL_INITIAL (decl) != 0
3490 || !DECL_FILE_SCOPE_P (decl))
3491 /* An automatic variable with an incomplete type
3493 : !DECL_EXTERNAL (decl)))
3495 error ("storage size of %q+D isn%'t known", decl);
3496 TREE_TYPE (decl) = error_mark_node;
3499 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3500 && DECL_SIZE (decl) != 0)
3502 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3503 constant_expression_warning (DECL_SIZE (decl));
3505 error ("storage size of %q+D isn%'t constant", decl);
3508 if (TREE_USED (type))
3509 TREE_USED (decl) = 1;
3512 /* If this is a function and an assembler name is specified, reset DECL_RTL
3513 so we can give it its new name. Also, update built_in_decls if it
3514 was a normal built-in. */
3515 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3517 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3518 set_builtin_user_assembler_name (decl, asmspec);
3519 set_user_assembler_name (decl, asmspec);
3522 /* If #pragma weak was used, mark the decl weak now. */
3523 maybe_apply_pragma_weak (decl);
3525 /* Output the assembler code and/or RTL code for variables and functions,
3526 unless the type is an undefined structure or union.
3527 If not, it will get done when the type is completed. */
3529 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3531 /* Determine the ELF visibility. */
3532 if (TREE_PUBLIC (decl))
3533 c_determine_visibility (decl);
3535 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3536 if (c_dialect_objc ())
3537 objc_check_decl (decl);
3541 /* If this is not a static variable, issue a warning.
3542 It doesn't make any sense to give an ASMSPEC for an
3543 ordinary, non-register local variable. Historically,
3544 GCC has accepted -- but ignored -- the ASMSPEC in
3546 if (!DECL_FILE_SCOPE_P (decl)
3547 && TREE_CODE (decl) == VAR_DECL
3548 && !C_DECL_REGISTER (decl)
3549 && !TREE_STATIC (decl))
3550 warning (0, "ignoring asm-specifier for non-static local "
3551 "variable %q+D", decl);
3553 set_user_assembler_name (decl, asmspec);
3556 if (DECL_FILE_SCOPE_P (decl))
3558 if (DECL_INITIAL (decl) == NULL_TREE
3559 || DECL_INITIAL (decl) == error_mark_node)
3560 /* Don't output anything
3561 when a tentative file-scope definition is seen.
3562 But at end of compilation, do output code for them. */
3563 DECL_DEFER_OUTPUT (decl) = 1;
3564 rest_of_decl_compilation (decl, true, 0);
3568 /* In conjunction with an ASMSPEC, the `register'
3569 keyword indicates that we should place the variable
3570 in a particular register. */
3571 if (asmspec && C_DECL_REGISTER (decl))
3573 DECL_HARD_REGISTER (decl) = 1;
3574 /* This cannot be done for a structure with volatile
3575 fields, on which DECL_REGISTER will have been
3577 if (!DECL_REGISTER (decl))
3578 error ("cannot put object with volatile field into register");
3581 if (TREE_CODE (decl) != FUNCTION_DECL)
3583 /* If we're building a variable sized type, and we might be
3584 reachable other than via the top of the current binding
3585 level, then create a new BIND_EXPR so that we deallocate
3586 the object at the right time. */
3587 /* Note that DECL_SIZE can be null due to errors. */
3588 if (DECL_SIZE (decl)
3589 && !TREE_CONSTANT (DECL_SIZE (decl))
3590 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3593 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3594 TREE_SIDE_EFFECTS (bind) = 1;
3596 BIND_EXPR_BODY (bind) = push_stmt_list ();
3598 add_stmt (build_stmt (DECL_EXPR, decl));
3603 if (!DECL_FILE_SCOPE_P (decl))
3605 /* Recompute the RTL of a local array now
3606 if it used to be an incomplete type. */
3608 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3610 /* If we used it already as memory, it must stay in memory. */
3611 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3612 /* If it's still incomplete now, no init will save it. */
3613 if (DECL_SIZE (decl) == 0)
3614 DECL_INITIAL (decl) = 0;
3619 /* If this was marked 'used', be sure it will be output. */
3620 if (!flag_unit_at_a_time && lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3621 mark_decl_referenced (decl);
3623 if (TREE_CODE (decl) == TYPE_DECL)
3625 if (!DECL_FILE_SCOPE_P (decl)
3626 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3627 add_stmt (build_stmt (DECL_EXPR, decl));
3629 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3632 /* At the end of a declaration, throw away any variable type sizes
3633 of types defined inside that declaration. There is no use
3634 computing them in the following function definition. */
3635 if (current_scope == file_scope)
3636 get_pending_sizes ();
3638 /* Install a cleanup (aka destructor) if one was given. */
3639 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3641 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3644 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3645 tree cleanup_decl = lookup_name (cleanup_id);
3648 /* Build "cleanup(&decl)" for the destructor. */
3649 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3650 cleanup = build_tree_list (NULL_TREE, cleanup);
3651 cleanup = build_function_call (cleanup_decl, cleanup);
3653 /* Don't warn about decl unused; the cleanup uses it. */
3654 TREE_USED (decl) = 1;
3655 TREE_USED (cleanup_decl) = 1;
3657 /* Initialize EH, if we've been told to do so. */
3658 c_maybe_initialize_eh ();
3660 push_cleanup (decl, cleanup, false);
3665 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3668 grokparm (const struct c_parm *parm)
3670 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3671 NULL, DEPRECATED_NORMAL);
3673 decl_attributes (&decl, parm->attrs, 0);
3678 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3679 and push that on the current scope. */
3682 push_parm_decl (const struct c_parm *parm)
3686 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
3688 decl_attributes (&decl, parm->attrs, 0);
3690 decl = pushdecl (decl);
3692 finish_decl (decl, NULL_TREE, NULL_TREE);
3695 /* Mark all the parameter declarations to date as forward decls.
3696 Also diagnose use of this extension. */
3699 mark_forward_parm_decls (void)
3701 struct c_binding *b;
3703 if (pedantic && !current_scope->warned_forward_parm_decls)
3705 pedwarn ("ISO C forbids forward parameter declarations");
3706 current_scope->warned_forward_parm_decls = true;
3709 for (b = current_scope->bindings; b; b = b->prev)
3710 if (TREE_CODE (b->decl) == PARM_DECL)
3711 TREE_ASM_WRITTEN (b->decl) = 1;
3714 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3715 literal, which may be an incomplete array type completed by the
3716 initializer; INIT is a CONSTRUCTOR that initializes the compound
3720 build_compound_literal (tree type, tree init)
3722 /* We do not use start_decl here because we have a type, not a declarator;
3723 and do not use finish_decl because the decl should be stored inside
3724 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3729 if (type == error_mark_node)
3730 return error_mark_node;
3732 decl = build_decl (VAR_DECL, NULL_TREE, type);
3733 DECL_EXTERNAL (decl) = 0;
3734 TREE_PUBLIC (decl) = 0;
3735 TREE_STATIC (decl) = (current_scope == file_scope);
3736 DECL_CONTEXT (decl) = current_function_decl;
3737 TREE_USED (decl) = 1;
3738 TREE_TYPE (decl) = type;
3739 TREE_READONLY (decl) = TYPE_READONLY (type);
3740 store_init_value (decl, init);
3742 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3744 int failure = complete_array_type (&TREE_TYPE (decl),
3745 DECL_INITIAL (decl), true);
3746 gcc_assert (!failure);
3748 type = TREE_TYPE (decl);
3749 TREE_TYPE (DECL_INITIAL (decl)) = type;
3752 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3753 return error_mark_node;
3755 stmt = build_stmt (DECL_EXPR, decl);
3756 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3757 TREE_SIDE_EFFECTS (complit) = 1;
3759 layout_decl (decl, 0);
3761 if (TREE_STATIC (decl))
3763 /* This decl needs a name for the assembler output. */
3764 set_compound_literal_name (decl);
3765 DECL_DEFER_OUTPUT (decl) = 1;
3766 DECL_COMDAT (decl) = 1;
3767 DECL_ARTIFICIAL (decl) = 1;
3768 DECL_IGNORED_P (decl) = 1;
3770 rest_of_decl_compilation (decl, 1, 0);
3776 /* Determine whether TYPE is a structure with a flexible array member,
3777 or a union containing such a structure (possibly recursively). */
3780 flexible_array_type_p (tree type)
3783 switch (TREE_CODE (type))
3786 x = TYPE_FIELDS (type);
3789 while (TREE_CHAIN (x) != NULL_TREE)
3791 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3792 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3793 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3794 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3798 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3800 if (flexible_array_type_p (TREE_TYPE (x)))
3809 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3810 replacing with appropriate values if they are invalid. */
3812 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3815 unsigned int max_width;
3816 unsigned HOST_WIDE_INT w;
3817 const char *name = orig_name ? orig_name: _("<anonymous>");
3819 /* Detect and ignore out of range field width and process valid
3821 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3822 || TREE_CODE (*width) != INTEGER_CST)
3824 error ("bit-field %qs width not an integer constant", name);
3825 *width = integer_one_node;
3829 constant_expression_warning (*width);
3830 if (tree_int_cst_sgn (*width) < 0)
3832 error ("negative width in bit-field %qs", name);
3833 *width = integer_one_node;
3835 else if (integer_zerop (*width) && orig_name)
3837 error ("zero width for bit-field %qs", name);
3838 *width = integer_one_node;
3842 /* Detect invalid bit-field type. */
3843 if (TREE_CODE (*type) != INTEGER_TYPE
3844 && TREE_CODE (*type) != BOOLEAN_TYPE
3845 && TREE_CODE (*type) != ENUMERAL_TYPE)
3847 error ("bit-field %qs has invalid type", name);
3848 *type = unsigned_type_node;
3851 type_mv = TYPE_MAIN_VARIANT (*type);
3853 && !in_system_header
3854 && type_mv != integer_type_node
3855 && type_mv != unsigned_type_node
3856 && type_mv != boolean_type_node)
3857 pedwarn ("type of bit-field %qs is a GCC extension", name);
3859 if (type_mv == boolean_type_node)
3860 max_width = CHAR_TYPE_SIZE;
3862 max_width = TYPE_PRECISION (*type);
3864 if (0 < compare_tree_int (*width, max_width))
3866 error ("width of %qs exceeds its type", name);
3868 *width = build_int_cst (NULL_TREE, w);
3871 w = tree_low_cst (*width, 1);
3873 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3875 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3877 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3878 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3879 warning (0, "%qs is narrower than values of its type", name);
3885 /* Print warning about variable length array if necessary. */
3888 warn_variable_length_array (const char *name, tree size)
3890 int ped = !flag_isoc99 && pedantic && warn_vla != 0;
3891 int const_size = TREE_CONSTANT (size);
3898 pedwarn ("ISO C90 forbids array %qs whose size "
3899 "can%'t be evaluated",
3902 pedwarn ("ISO C90 forbids array whose size "
3903 "can%'t be evaluated");
3908 pedwarn ("ISO C90 forbids variable length array %qs",
3911 pedwarn ("ISO C90 forbids variable length array");
3914 else if (warn_vla > 0)
3920 "the size of array %qs can"
3921 "%'t be evaluated", name);
3924 "the size of array can %'t be evaluated");
3930 "variable length array %qs is used",
3934 "variable length array is used");
3939 /* Given declspecs and a declarator,
3940 determine the name and type of the object declared
3941 and construct a ..._DECL node for it.
3942 (In one case we can return a ..._TYPE node instead.
3943 For invalid input we sometimes return 0.)
3945 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3947 DECL_CONTEXT says which syntactic context this declaration is in:
3948 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3949 FUNCDEF for a function definition. Like NORMAL but a few different
3950 error messages in each case. Return value may be zero meaning
3951 this definition is too screwy to try to parse.
3952 PARM for a parameter declaration (either within a function prototype
3953 or before a function body). Make a PARM_DECL, or return void_type_node.
3954 TYPENAME if for a typename (in a cast or sizeof).
3955 Don't make a DECL node; just return the ..._TYPE node.
3956 FIELD for a struct or union field; make a FIELD_DECL.
3957 INITIALIZED is true if the decl has an initializer.
3958 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3959 representing the width of the bit-field.
3960 DEPRECATED_STATE is a deprecated_states value indicating whether
3961 deprecation warnings should be suppressed.
3963 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3964 It may also be so in the PARM case, for a prototype where the
3965 argument type is specified but not the name.
3967 This function is where the complicated C meanings of `static'
3968 and `extern' are interpreted. */
3971 grokdeclarator (const struct c_declarator *declarator,
3972 struct c_declspecs *declspecs,
3973 enum decl_context decl_context, bool initialized, tree *width,
3974 enum deprecated_states deprecated_state)
3976 tree type = declspecs->type;
3977 bool threadp = declspecs->thread_p;
3978 enum c_storage_class storage_class = declspecs->storage_class;
3982 int type_quals = TYPE_UNQUALIFIED;
3983 const char *name, *orig_name;
3984 tree typedef_type = 0;
3985 bool funcdef_flag = false;
3986 bool funcdef_syntax = false;
3987 int size_varies = 0;
3988 tree decl_attr = declspecs->decl_attr;
3989 int array_ptr_quals = TYPE_UNQUALIFIED;
3990 tree array_ptr_attrs = NULL_TREE;
3991 int array_parm_static = 0;
3992 bool array_parm_vla_unspec_p = false;
3993 tree returned_attrs = NULL_TREE;
3994 bool bitfield = width != NULL;
3996 struct c_arg_info *arg_info = 0;
3998 if (decl_context == FUNCDEF)
3999 funcdef_flag = true, decl_context = NORMAL;
4001 /* Look inside a declarator for the name being declared
4002 and get it as a string, for an error message. */
4004 const struct c_declarator *decl = declarator;
4013 funcdef_syntax = (decl->kind == cdk_function);
4014 decl = decl->declarator;
4018 decl = decl->declarator;
4023 name = IDENTIFIER_POINTER (decl->u.id);
4035 /* A function definition's declarator must have the form of
4036 a function declarator. */
4038 if (funcdef_flag && !funcdef_syntax)
4041 /* If this looks like a function definition, make it one,
4042 even if it occurs where parms are expected.
4043 Then store_parm_decls will reject it and not use it as a parm. */
4044 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4045 decl_context = PARM;
4047 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4048 warn_deprecated_use (declspecs->type);
4050 if ((decl_context == NORMAL || decl_context == FIELD)
4051 && current_scope == file_scope
4052 && variably_modified_type_p (type, NULL_TREE))
4054 error ("variably modified %qs at file scope", name);
4055 type = integer_type_node;
4058 typedef_type = type;
4059 size_varies = C_TYPE_VARIABLE_SIZE (type);
4061 /* Diagnose defaulting to "int". */
4063 if (declspecs->default_int_p && !in_system_header)
4065 /* Issue a warning if this is an ISO C 99 program or if
4066 -Wreturn-type and this is a function, or if -Wimplicit;
4067 prefer the former warning since it is more explicit. */
4068 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4070 warn_about_return_type = 1;
4071 else if (warn_implicit_int || flag_isoc99)
4072 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
4075 /* Adjust the type if a bit-field is being declared,
4076 -funsigned-bitfields applied and the type is not explicitly
4078 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4079 && TREE_CODE (type) == INTEGER_TYPE)
4080 type = c_common_unsigned_type (type);
4082 /* Figure out the type qualifiers for the declaration. There are
4083 two ways a declaration can become qualified. One is something
4084 like `const int i' where the `const' is explicit. Another is
4085 something like `typedef const int CI; CI i' where the type of the
4086 declaration contains the `const'. A third possibility is that
4087 there is a type qualifier on the element type of a typedefed
4088 array type, in which case we should extract that qualifier so
4089 that c_apply_type_quals_to_decls receives the full list of
4090 qualifiers to work with (C90 is not entirely clear about whether
4091 duplicate qualifiers should be diagnosed in this case, but it
4092 seems most appropriate to do so). */
4093 element_type = strip_array_types (type);
4094 constp = declspecs->const_p + TYPE_READONLY (element_type);
4095 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4096 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4097 if (pedantic && !flag_isoc99)
4100 pedwarn ("duplicate %<const%>");
4102 pedwarn ("duplicate %<restrict%>");
4104 pedwarn ("duplicate %<volatile%>");
4106 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4107 type = TYPE_MAIN_VARIANT (type);
4108 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4109 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4110 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4112 /* Warn about storage classes that are invalid for certain
4113 kinds of declarations (parameters, typenames, etc.). */
4117 || storage_class == csc_auto
4118 || storage_class == csc_register
4119 || storage_class == csc_typedef))
4121 if (storage_class == csc_auto
4122 && (pedantic || current_scope == file_scope))
4123 pedwarn ("function definition declared %<auto%>");
4124 if (storage_class == csc_register)
4125 error ("function definition declared %<register%>");
4126 if (storage_class == csc_typedef)
4127 error ("function definition declared %<typedef%>");
4129 error ("function definition declared %<__thread%>");
4131 if (storage_class == csc_auto
4132 || storage_class == csc_register
4133 || storage_class == csc_typedef)
4134 storage_class = csc_none;
4136 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4138 if (decl_context == PARM && storage_class == csc_register)
4142 switch (decl_context)
4145 error ("storage class specified for structure field %qs",
4149 error ("storage class specified for parameter %qs", name);
4152 error ("storage class specified for typename");
4155 storage_class = csc_none;
4159 else if (storage_class == csc_extern
4163 /* 'extern' with initialization is invalid if not at file scope. */
4164 if (current_scope == file_scope)
4166 /* It is fine to have 'extern const' when compiling at C
4167 and C++ intersection. */
4168 if (!(warn_cxx_compat && constp))
4169 warning (0, "%qs initialized and declared %<extern%>", name);
4172 error ("%qs has both %<extern%> and initializer", name);
4174 else if (current_scope == file_scope)
4176 if (storage_class == csc_auto)
4177 error ("file-scope declaration of %qs specifies %<auto%>", name);
4178 if (pedantic && storage_class == csc_register)
4179 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
4183 if (storage_class == csc_extern && funcdef_flag)
4184 error ("nested function %qs declared %<extern%>", name);
4185 else if (threadp && storage_class == csc_none)
4187 error ("function-scope %qs implicitly auto and declared "
4194 /* Now figure out the structure of the declarator proper.
4195 Descend through it, creating more complex types, until we reach
4196 the declared identifier (or NULL_TREE, in an absolute declarator).
4197 At each stage we maintain an unqualified version of the type
4198 together with any qualifiers that should be applied to it with
4199 c_build_qualified_type; this way, array types including
4200 multidimensional array types are first built up in unqualified
4201 form and then the qualified form is created with
4202 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4204 while (declarator && declarator->kind != cdk_id)
4206 if (type == error_mark_node)
4208 declarator = declarator->declarator;
4212 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4213 a cdk_pointer (for *...),
4214 a cdk_function (for ...(...)),
4215 a cdk_attrs (for nested attributes),
4216 or a cdk_id (for the name being declared
4217 or the place in an absolute declarator
4218 where the name was omitted).
4219 For the last case, we have just exited the loop.
4221 At this point, TYPE is the type of elements of an array,
4222 or for a function to return, or for a pointer to point to.
4223 After this sequence of ifs, TYPE is the type of the
4224 array or function or pointer, and DECLARATOR has had its
4225 outermost layer removed. */
4227 if (array_ptr_quals != TYPE_UNQUALIFIED
4228 || array_ptr_attrs != NULL_TREE
4229 || array_parm_static)
4231 /* Only the innermost declarator (making a parameter be of
4232 array type which is converted to pointer type)
4233 may have static or type qualifiers. */
4234 error ("static or type qualifiers in non-parameter array declarator");
4235 array_ptr_quals = TYPE_UNQUALIFIED;
4236 array_ptr_attrs = NULL_TREE;
4237 array_parm_static = 0;
4240 switch (declarator->kind)
4244 /* A declarator with embedded attributes. */
4245 tree attrs = declarator->u.attrs;
4246 const struct c_declarator *inner_decl;
4248 declarator = declarator->declarator;
4249 inner_decl = declarator;
4250 while (inner_decl->kind == cdk_attrs)
4251 inner_decl = inner_decl->declarator;
4252 if (inner_decl->kind == cdk_id)
4253 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4254 else if (inner_decl->kind == cdk_function)
4255 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4256 else if (inner_decl->kind == cdk_array)
4257 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4258 returned_attrs = decl_attributes (&type,
4259 chainon (returned_attrs, attrs),
4265 tree itype = NULL_TREE;
4266 tree size = declarator->u.array.dimen;
4267 /* The index is a signed object `sizetype' bits wide. */
4268 tree index_type = c_common_signed_type (sizetype);
4270 array_ptr_quals = declarator->u.array.quals;
4271 array_ptr_attrs = declarator->u.array.attrs;
4272 array_parm_static = declarator->u.array.static_p;
4273 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
4275 declarator = declarator->declarator;
4277 /* Check for some types that there cannot be arrays of. */
4279 if (VOID_TYPE_P (type))
4281 error ("declaration of %qs as array of voids", name);
4282 type = error_mark_node;
4285 if (TREE_CODE (type) == FUNCTION_TYPE)
4287 error ("declaration of %qs as array of functions", name);
4288 type = error_mark_node;
4291 if (pedantic && !in_system_header && flexible_array_type_p (type))
4292 pedwarn ("invalid use of structure with flexible array member");
4294 if (size == error_mark_node)
4295 type = error_mark_node;
4297 if (type == error_mark_node)
4300 /* If size was specified, set ITYPE to a range-type for
4301 that size. Otherwise, ITYPE remains null. finish_decl
4302 may figure it out from an initial value. */
4306 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4308 STRIP_TYPE_NOPS (size);
4310 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4312 error ("size of array %qs has non-integer type", name);
4313 size = integer_one_node;
4316 if (pedantic && integer_zerop (size))
4317 pedwarn ("ISO C forbids zero-size array %qs", name);
4319 if (TREE_CODE (size) == INTEGER_CST)
4321 constant_expression_warning (size);
4322 if (tree_int_cst_sgn (size) < 0)
4324 error ("size of array %qs is negative", name);
4325 size = integer_one_node;
4328 else if ((decl_context == NORMAL || decl_context == FIELD)
4329 && current_scope == file_scope)
4331 error ("variably modified %qs at file scope", name);
4332 size = integer_one_node;
4336 /* Make sure the array size remains visibly
4337 nonconstant even if it is (eg) a const variable
4338 with known value. */
4340 warn_variable_length_array (orig_name, size);
4343 if (integer_zerop (size))
4345 /* A zero-length array cannot be represented with
4346 an unsigned index type, which is what we'll
4347 get with build_index_type. Create an
4348 open-ended range instead. */
4349 itype = build_range_type (sizetype, size, NULL_TREE);
4353 /* Arrange for the SAVE_EXPR on the inside of the
4354 MINUS_EXPR, which allows the -1 to get folded
4355 with the +1 that happens when building TYPE_SIZE. */
4357 size = variable_size (size);
4359 /* Compute the maximum valid index, that is, size
4360 - 1. Do the calculation in index_type, so that
4361 if it is a variable the computations will be
4362 done in the proper mode. */
4363 itype = fold_build2 (MINUS_EXPR, index_type,
4364 convert (index_type, size),
4365 convert (index_type,
4368 /* If that overflowed, the array is too big. ???
4369 While a size of INT_MAX+1 technically shouldn't
4370 cause an overflow (because we subtract 1), the
4371 overflow is recorded during the conversion to
4372 index_type, before the subtraction. Handling
4373 this case seems like an unnecessary
4375 if (TREE_CODE (itype) == INTEGER_CST
4376 && TREE_OVERFLOW (itype))
4378 error ("size of array %qs is too large", name);
4379 type = error_mark_node;
4383 itype = build_index_type (itype);
4386 else if (decl_context == FIELD)
4388 if (pedantic && !flag_isoc99 && !in_system_header)
4389 pedwarn ("ISO C90 does not support flexible array members");
4391 /* ISO C99 Flexible array members are effectively
4392 identical to GCC's zero-length array extension. */
4393 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4395 else if (decl_context == PARM)
4397 if (array_parm_vla_unspec_p)
4402 error ("%<[*]%> not allowed in other than a declaration");
4405 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4409 else if (decl_context == TYPENAME)
4411 if (array_parm_vla_unspec_p)
4413 /* The error is printed elsewhere. We use this to
4414 avoid messing up with incomplete array types of
4415 the same type, that would otherwise be modified
4417 itype = build_range_type (sizetype, size_zero_node,
4422 /* Complain about arrays of incomplete types. */
4423 if (!COMPLETE_TYPE_P (type))
4425 error ("array type has incomplete element type");
4426 type = error_mark_node;
4429 /* When itype is NULL, a shared incomplete array type is
4430 returned for all array of a given type. Elsewhere we
4431 make sure we don't complete that type before copying
4432 it, but here we want to make sure we don't ever
4433 modify the shared type, so we gcc_assert (itype)
4435 type = build_array_type (type, itype);
4437 if (type != error_mark_node)
4441 /* It is ok to modify type here even if itype is
4442 NULL: if size_varies, we're in a
4443 multi-dimensional array and the inner type has
4444 variable size, so the enclosing shared array type
4446 if (size && TREE_CODE (size) == INTEGER_CST)
4448 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
4449 C_TYPE_VARIABLE_SIZE (type) = 1;
4452 /* The GCC extension for zero-length arrays differs from
4453 ISO flexible array members in that sizeof yields
4455 if (size && integer_zerop (size))
4458 TYPE_SIZE (type) = bitsize_zero_node;
4459 TYPE_SIZE_UNIT (type) = size_zero_node;
4461 if (array_parm_vla_unspec_p)
4464 /* The type is complete. C99 6.7.5.2p4 */
4465 TYPE_SIZE (type) = bitsize_zero_node;
4466 TYPE_SIZE_UNIT (type) = size_zero_node;
4470 if (decl_context != PARM
4471 && (array_ptr_quals != TYPE_UNQUALIFIED
4472 || array_ptr_attrs != NULL_TREE
4473 || array_parm_static))
4475 error ("static or type qualifiers in non-parameter array declarator");
4476 array_ptr_quals = TYPE_UNQUALIFIED;
4477 array_ptr_attrs = NULL_TREE;
4478 array_parm_static = 0;
4484 /* Say it's a definition only for the declarator closest
4485 to the identifier, apart possibly from some
4487 bool really_funcdef = false;
4491 const struct c_declarator *t = declarator->declarator;
4492 while (t->kind == cdk_attrs)
4494 really_funcdef = (t->kind == cdk_id);
4497 /* Declaring a function type. Make sure we have a valid
4498 type for the function to return. */
4499 if (type == error_mark_node)
4504 /* Warn about some types functions can't return. */
4505 if (TREE_CODE (type) == FUNCTION_TYPE)
4507 error ("%qs declared as function returning a function", name);
4508 type = integer_type_node;
4510 if (TREE_CODE (type) == ARRAY_TYPE)
4512 error ("%qs declared as function returning an array", name);
4513 type = integer_type_node;
4516 /* Construct the function type and go to the next
4517 inner layer of declarator. */
4518 arg_info = declarator->u.arg_info;
4519 arg_types = grokparms (arg_info, really_funcdef);
4521 put_pending_sizes (arg_info->pending_sizes);
4523 /* Type qualifiers before the return type of the function
4524 qualify the return type, not the function type. */
4527 /* Type qualifiers on a function return type are
4528 normally permitted by the standard but have no
4529 effect, so give a warning at -Wreturn-type.
4530 Qualifiers on a void return type are banned on
4531 function definitions in ISO C; GCC used to used
4532 them for noreturn functions. */
4533 if (VOID_TYPE_P (type) && really_funcdef)
4534 pedwarn ("function definition has qualified void return type");
4536 warning (OPT_Wreturn_type,
4537 "type qualifiers ignored on function return type");
4539 type = c_build_qualified_type (type, type_quals);
4541 type_quals = TYPE_UNQUALIFIED;
4543 type = build_function_type (type, arg_types);
4544 declarator = declarator->declarator;
4546 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4547 the formal parameter list of this FUNCTION_TYPE to point to
4548 the FUNCTION_TYPE node itself. */
4552 for (link = arg_info->tags;
4554 link = TREE_CHAIN (link))
4555 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4561 /* Merge any constancy or volatility into the target type
4564 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4566 pedwarn ("ISO C forbids qualified function types");
4568 type = c_build_qualified_type (type, type_quals);
4571 /* When the pointed-to type involves components of variable size,
4572 care must be taken to ensure that the size evaluation code is
4573 emitted early enough to dominate all the possible later uses
4574 and late enough for the variables on which it depends to have
4577 This is expected to happen automatically when the pointed-to
4578 type has a name/declaration of it's own, but special attention
4579 is required if the type is anonymous.
4581 We handle the NORMAL and FIELD contexts here by attaching an
4582 artificial TYPE_DECL to such pointed-to type. This forces the
4583 sizes evaluation at a safe point and ensures it is not deferred
4584 until e.g. within a deeper conditional context.
4586 We expect nothing to be needed here for PARM or TYPENAME.
4587 Pushing a TYPE_DECL at this point for TYPENAME would actually
4588 be incorrect, as we might be in the middle of an expression
4589 with side effects on the pointed-to type size "arguments" prior
4590 to the pointer declaration point and the fake TYPE_DECL in the
4591 enclosing context would force the size evaluation prior to the
4594 if (!TYPE_NAME (type)
4595 && (decl_context == NORMAL || decl_context == FIELD)
4596 && variably_modified_type_p (type, NULL_TREE))
4598 tree decl = build_decl (TYPE_DECL, NULL_TREE, type);
4599 DECL_ARTIFICIAL (decl) = 1;
4601 finish_decl (decl, NULL_TREE, NULL_TREE);
4602 TYPE_NAME (type) = decl;
4605 type = build_pointer_type (type);
4607 /* Process type qualifiers (such as const or volatile)
4608 that were given inside the `*'. */
4609 type_quals = declarator->u.pointer_quals;
4611 declarator = declarator->declarator;
4619 /* Now TYPE has the actual type, apart from any qualifiers in
4622 /* Check the type and width of a bit-field. */
4624 check_bitfield_type_and_width (&type, width, orig_name);
4626 /* Did array size calculations overflow? */
4628 if (TREE_CODE (type) == ARRAY_TYPE
4629 && COMPLETE_TYPE_P (type)
4630 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4631 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4633 error ("size of array %qs is too large", name);
4634 /* If we proceed with the array type as it is, we'll eventually
4635 crash in tree_low_cst(). */
4636 type = error_mark_node;
4639 /* If this is declaring a typedef name, return a TYPE_DECL. */
4641 if (storage_class == csc_typedef)
4644 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4646 pedwarn ("ISO C forbids qualified function types");
4648 type = c_build_qualified_type (type, type_quals);
4649 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4650 if (declspecs->explicit_signed_p)
4651 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4652 decl_attributes (&decl, returned_attrs, 0);
4653 if (declspecs->inline_p)
4654 pedwarn ("typedef %q+D declared %<inline%>", decl);
4658 /* If this is a type name (such as, in a cast or sizeof),
4659 compute the type and return it now. */
4661 if (decl_context == TYPENAME)
4663 /* Note that the grammar rejects storage classes in typenames
4665 gcc_assert (storage_class == csc_none && !threadp
4666 && !declspecs->inline_p);
4667 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4669 pedwarn ("ISO C forbids const or volatile function types");
4671 type = c_build_qualified_type (type, type_quals);
4672 decl_attributes (&type, returned_attrs, 0);
4676 if (pedantic && decl_context == FIELD
4677 && variably_modified_type_p (type, NULL_TREE))
4680 pedwarn ("a member of a structure or union cannot have a variably modified type");
4683 /* Aside from typedefs and type names (handle above),
4684 `void' at top level (not within pointer)
4685 is allowed only in public variables.
4686 We don't complain about parms either, but that is because
4687 a better error message can be made later. */
4689 if (VOID_TYPE_P (type) && decl_context != PARM
4690 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4691 && (storage_class == csc_extern
4692 || (current_scope == file_scope
4693 && !(storage_class == csc_static
4694 || storage_class == csc_register)))))
4696 error ("variable or field %qs declared void", name);
4697 type = integer_type_node;
4700 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4701 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4706 if (decl_context == PARM)
4708 tree type_as_written;
4711 /* A parameter declared as an array of T is really a pointer to T.
4712 One declared as a function is really a pointer to a function. */
4714 if (TREE_CODE (type) == ARRAY_TYPE)
4716 /* Transfer const-ness of array into that of type pointed to. */
4717 type = TREE_TYPE (type);
4719 type = c_build_qualified_type (type, type_quals);
4720 type = build_pointer_type (type);
4721 type_quals = array_ptr_quals;
4723 /* We don't yet implement attributes in this context. */
4724 if (array_ptr_attrs != NULL_TREE)
4725 warning (OPT_Wattributes,
4726 "attributes in parameter array declarator ignored");
4730 else if (TREE_CODE (type) == FUNCTION_TYPE)
4732 if (pedantic && type_quals)
4733 pedwarn ("ISO C forbids qualified function types");
4735 type = c_build_qualified_type (type, type_quals);
4736 type = build_pointer_type (type);
4737 type_quals = TYPE_UNQUALIFIED;
4739 else if (type_quals)
4740 type = c_build_qualified_type (type, type_quals);
4742 type_as_written = type;
4744 decl = build_decl (PARM_DECL, declarator->u.id, type);
4746 C_DECL_VARIABLE_SIZE (decl) = 1;
4748 /* Compute the type actually passed in the parmlist,
4749 for the case where there is no prototype.
4750 (For example, shorts and chars are passed as ints.)
4751 When there is a prototype, this is overridden later. */
4753 if (type == error_mark_node)
4754 promoted_type = type;
4756 promoted_type = c_type_promotes_to (type);
4758 DECL_ARG_TYPE (decl) = promoted_type;
4759 if (declspecs->inline_p)
4760 pedwarn ("parameter %q+D declared %<inline%>", decl);
4762 else if (decl_context == FIELD)
4764 /* Note that the grammar rejects storage classes in typenames
4766 gcc_assert (storage_class == csc_none && !threadp
4767 && !declspecs->inline_p);
4769 /* Structure field. It may not be a function. */
4771 if (TREE_CODE (type) == FUNCTION_TYPE)
4773 error ("field %qs declared as a function", name);
4774 type = build_pointer_type (type);
4776 else if (TREE_CODE (type) != ERROR_MARK
4777 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4779 error ("field %qs has incomplete type", name);
4780 type = error_mark_node;
4782 type = c_build_qualified_type (type, type_quals);
4783 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4784 DECL_NONADDRESSABLE_P (decl) = bitfield;
4785 if (bitfield && !declarator->u.id)
4786 TREE_NO_WARNING (decl) = 1;
4789 C_DECL_VARIABLE_SIZE (decl) = 1;
4791 else if (TREE_CODE (type) == FUNCTION_TYPE)
4793 if (storage_class == csc_register || threadp)
4795 error ("invalid storage class for function %qs", name);
4797 else if (current_scope != file_scope)
4799 /* Function declaration not at file scope. Storage
4800 classes other than `extern' are not allowed, C99
4801 6.7.1p5, and `extern' makes no difference. However,
4802 GCC allows 'auto', perhaps with 'inline', to support
4803 nested functions. */
4804 if (storage_class == csc_auto)
4807 pedwarn ("invalid storage class for function %qs", name);
4809 else if (storage_class == csc_static)
4811 error ("invalid storage class for function %qs", name);
4813 storage_class = declspecs->storage_class = csc_none;
4819 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4820 decl = build_decl_attribute_variant (decl, decl_attr);
4822 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4824 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4825 pedwarn ("ISO C forbids qualified function types");
4827 /* GNU C interprets a volatile-qualified function type to indicate
4828 that the function does not return. */
4829 if ((type_quals & TYPE_QUAL_VOLATILE)
4830 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4831 warning (0, "%<noreturn%> function returns non-void value");
4833 /* Every function declaration is an external reference
4834 (DECL_EXTERNAL) except for those which are not at file
4835 scope and are explicitly declared "auto". This is
4836 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4837 GCC to signify a forward declaration of a nested function. */
4838 if (storage_class == csc_auto && current_scope != file_scope)
4839 DECL_EXTERNAL (decl) = 0;
4840 /* In C99, a function which is declared 'inline' with 'extern'
4841 is not an external reference (which is confusing). It
4842 means that the later definition of the function must be output
4843 in this file, C99 6.7.4p6. In GNU C89, a function declared
4844 'extern inline' is an external reference. */
4845 else if (declspecs->inline_p && storage_class != csc_static)
4846 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
4847 == flag_gnu89_inline);
4849 DECL_EXTERNAL (decl) = !initialized;
4851 /* Record absence of global scope for `static' or `auto'. */
4853 = !(storage_class == csc_static || storage_class == csc_auto);
4855 /* For a function definition, record the argument information
4856 block where store_parm_decls will look for it. */
4858 current_function_arg_info = arg_info;
4860 if (declspecs->default_int_p)
4861 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4863 /* Record presence of `inline', if it is reasonable. */
4864 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4866 if (declspecs->inline_p)
4867 pedwarn ("cannot inline function %<main%>");
4869 else if (declspecs->inline_p)
4871 /* Record that the function is declared `inline'. */
4872 DECL_DECLARED_INLINE_P (decl) = 1;
4874 /* Do not mark bare declarations as DECL_INLINE. Doing so
4875 in the presence of multiple declarations can result in
4876 the abstract origin pointing between the declarations,
4877 which will confuse dwarf2out. */
4879 DECL_INLINE (decl) = 1;
4881 /* If -finline-functions, assume it can be inlined. This does
4882 two things: let the function be deferred until it is actually
4883 needed, and let dwarf2 know that the function is inlinable. */
4884 else if (flag_inline_trees == 2 && initialized)
4885 DECL_INLINE (decl) = 1;
4889 /* It's a variable. */
4890 /* An uninitialized decl with `extern' is a reference. */
4891 int extern_ref = !initialized && storage_class == csc_extern;
4893 type = c_build_qualified_type (type, type_quals);
4895 /* C99 6.2.2p7: It is invalid (compile-time undefined
4896 behavior) to create an 'extern' declaration for a
4897 variable if there is a global declaration that is
4898 'static' and the global declaration is not visible.
4899 (If the static declaration _is_ currently visible,
4900 the 'extern' declaration is taken to refer to that decl.) */
4901 if (extern_ref && current_scope != file_scope)
4903 tree global_decl = identifier_global_value (declarator->u.id);
4904 tree visible_decl = lookup_name (declarator->u.id);
4907 && global_decl != visible_decl
4908 && TREE_CODE (global_decl) == VAR_DECL
4909 && !TREE_PUBLIC (global_decl))
4910 error ("variable previously declared %<static%> redeclared "
4914 decl = build_decl (VAR_DECL, declarator->u.id, type);
4915 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4917 C_DECL_VARIABLE_SIZE (decl) = 1;
4919 if (declspecs->inline_p)
4920 pedwarn ("variable %q+D declared %<inline%>", decl);
4922 /* At file scope, an initialized extern declaration may follow
4923 a static declaration. In that case, DECL_EXTERNAL will be
4924 reset later in start_decl. */
4925 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4927 /* At file scope, the presence of a `static' or `register' storage
4928 class specifier, or the absence of all storage class specifiers
4929 makes this declaration a definition (perhaps tentative). Also,
4930 the absence of `static' makes it public. */
4931 if (current_scope == file_scope)
4933 TREE_PUBLIC (decl) = storage_class != csc_static;
4934 TREE_STATIC (decl) = !extern_ref;
4936 /* Not at file scope, only `static' makes a static definition. */
4939 TREE_STATIC (decl) = (storage_class == csc_static);
4940 TREE_PUBLIC (decl) = extern_ref;
4944 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4947 if (storage_class == csc_extern
4948 && variably_modified_type_p (type, NULL_TREE))
4951 error ("object with variably modified type must have no linkage");
4954 /* Record `register' declaration for warnings on &
4955 and in case doing stupid register allocation. */
4957 if (storage_class == csc_register)
4959 C_DECL_REGISTER (decl) = 1;
4960 DECL_REGISTER (decl) = 1;
4963 /* Record constancy and volatility. */
4964 c_apply_type_quals_to_decl (type_quals, decl);
4966 /* If a type has volatile components, it should be stored in memory.
4967 Otherwise, the fact that those components are volatile
4968 will be ignored, and would even crash the compiler.
4969 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4970 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4971 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4972 || TREE_CODE (decl) == RESULT_DECL))
4974 /* It is not an error for a structure with volatile fields to
4975 be declared register, but reset DECL_REGISTER since it
4976 cannot actually go in a register. */
4977 int was_reg = C_DECL_REGISTER (decl);
4978 C_DECL_REGISTER (decl) = 0;
4979 DECL_REGISTER (decl) = 0;
4980 c_mark_addressable (decl);
4981 C_DECL_REGISTER (decl) = was_reg;
4984 /* This is the earliest point at which we might know the assembler
4985 name of a variable. Thus, if it's known before this, die horribly. */
4986 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4988 decl_attributes (&decl, returned_attrs, 0);
4994 /* Decode the parameter-list info for a function type or function definition.
4995 The argument is the value returned by `get_parm_info' (or made in c-parse.c
4996 if there is an identifier list instead of a parameter decl list).
4997 These two functions are separate because when a function returns
4998 or receives functions then each is called multiple times but the order
4999 of calls is different. The last call to `grokparms' is always the one
5000 that contains the formal parameter names of a function definition.
5002 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5004 FUNCDEF_FLAG is true for a function definition, false for
5005 a mere declaration. A nonempty identifier-list gets an error message
5006 when FUNCDEF_FLAG is false. */
5009 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
5011 tree arg_types = arg_info->types;
5013 if (funcdef_flag && arg_info->had_vla_unspec)
5015 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5017 error ("%<[*]%> not allowed in other than function prototype scope");
5020 if (arg_types == 0 && !funcdef_flag && !in_system_header)
5021 warning (OPT_Wstrict_prototypes,
5022 "function declaration isn%'t a prototype");
5024 if (arg_types == error_mark_node)
5025 return 0; /* don't set TYPE_ARG_TYPES in this case */
5027 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
5030 pedwarn ("parameter names (without types) in function declaration");
5032 arg_info->parms = arg_info->types;
5033 arg_info->types = 0;
5038 tree parm, type, typelt;
5039 unsigned int parmno;
5041 /* If there is a parameter of incomplete type in a definition,
5042 this is an error. In a declaration this is valid, and a
5043 struct or union type may be completed later, before any calls
5044 or definition of the function. In the case where the tag was
5045 first declared within the parameter list, a warning has
5046 already been given. If a parameter has void type, then
5047 however the function cannot be defined or called, so
5050 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
5052 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
5054 type = TREE_VALUE (typelt);
5055 if (type == error_mark_node)
5058 if (!COMPLETE_TYPE_P (type))
5062 if (DECL_NAME (parm))
5063 error ("parameter %u (%q+D) has incomplete type",
5066 error ("%Jparameter %u has incomplete type",
5069 TREE_VALUE (typelt) = error_mark_node;
5070 TREE_TYPE (parm) = error_mark_node;
5072 else if (VOID_TYPE_P (type))
5074 if (DECL_NAME (parm))
5075 warning (0, "parameter %u (%q+D) has void type",
5078 warning (0, "%Jparameter %u has void type",
5083 if (DECL_NAME (parm) && TREE_USED (parm))
5084 warn_if_shadowing (parm);
5090 /* Take apart the current scope and return a c_arg_info structure with
5091 info on a parameter list just parsed.
5093 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5095 ELLIPSIS being true means the argument list ended in '...' so don't
5096 append a sentinel (void_list_node) to the end of the type-list. */
5099 get_parm_info (bool ellipsis)
5101 struct c_binding *b = current_scope->bindings;
5102 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
5109 static bool explained_incomplete_types = false;
5110 bool gave_void_only_once_err = false;
5112 arg_info->parms = 0;
5114 arg_info->types = 0;
5115 arg_info->others = 0;
5116 arg_info->pending_sizes = 0;
5117 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
5119 /* The bindings in this scope must not get put into a block.
5120 We will take care of deleting the binding nodes. */
5121 current_scope->bindings = 0;
5123 /* This function is only called if there was *something* on the
5127 /* A parameter list consisting solely of 'void' indicates that the
5128 function takes no arguments. But if the 'void' is qualified
5129 (by 'const' or 'volatile'), or has a storage class specifier
5130 ('register'), then the behavior is undefined; issue an error.
5131 Typedefs for 'void' are OK (see DR#157). */
5132 if (b->prev == 0 /* one binding */
5133 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
5134 && !DECL_NAME (b->decl) /* anonymous */
5135 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
5137 if (TREE_THIS_VOLATILE (b->decl)
5138 || TREE_READONLY (b->decl)
5139 || C_DECL_REGISTER (b->decl))
5140 error ("%<void%> as only parameter may not be qualified");
5142 /* There cannot be an ellipsis. */
5144 error ("%<void%> must be the only parameter");
5146 arg_info->types = void_list_node;
5151 types = void_list_node;
5153 /* Break up the bindings list into parms, tags, types, and others;
5154 apply sanity checks; purge the name-to-decl bindings. */
5157 tree decl = b->decl;
5158 tree type = TREE_TYPE (decl);
5159 const char *keyword;
5161 switch (TREE_CODE (decl))
5166 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5167 I_SYMBOL_BINDING (b->id) = b->shadowed;
5170 /* Check for forward decls that never got their actual decl. */
5171 if (TREE_ASM_WRITTEN (decl))
5172 error ("parameter %q+D has just a forward declaration", decl);
5173 /* Check for (..., void, ...) and issue an error. */
5174 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
5176 if (!gave_void_only_once_err)
5178 error ("%<void%> must be the only parameter");
5179 gave_void_only_once_err = true;
5184 /* Valid parameter, add it to the list. */
5185 TREE_CHAIN (decl) = parms;
5188 /* Since there is a prototype, args are passed in their
5189 declared types. The back end may override this later. */
5190 DECL_ARG_TYPE (decl) = type;
5191 types = tree_cons (0, type, types);
5195 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
5196 case UNION_TYPE: keyword = "union"; goto tag;
5197 case RECORD_TYPE: keyword = "struct"; goto tag;
5199 /* Types may not have tag-names, in which case the type
5200 appears in the bindings list with b->id NULL. */
5203 gcc_assert (I_TAG_BINDING (b->id) == b);
5204 I_TAG_BINDING (b->id) = b->shadowed;
5207 /* Warn about any struct, union or enum tags defined in a
5208 parameter list. The scope of such types is limited to
5209 the parameter list, which is rarely if ever desirable
5210 (it's impossible to call such a function with type-
5211 correct arguments). An anonymous union parm type is
5212 meaningful as a GNU extension, so don't warn for that. */
5213 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
5216 /* The %s will be one of 'struct', 'union', or 'enum'. */
5217 warning (0, "%<%s %E%> declared inside parameter list",
5220 /* The %s will be one of 'struct', 'union', or 'enum'. */
5221 warning (0, "anonymous %s declared inside parameter list",
5224 if (!explained_incomplete_types)
5226 warning (0, "its scope is only this definition or declaration,"
5227 " which is probably not what you want");
5228 explained_incomplete_types = true;
5232 tags = tree_cons (b->id, decl, tags);
5238 /* CONST_DECLs appear here when we have an embedded enum,
5239 and TYPE_DECLs appear here when we have an embedded struct
5240 or union. No warnings for this - we already warned about the
5241 type itself. FUNCTION_DECLs appear when there is an implicit
5242 function declaration in the parameter list. */
5244 TREE_CHAIN (decl) = others;
5249 /* error_mark_node appears here when we have an undeclared
5250 variable. Just throw it away. */
5253 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5254 I_SYMBOL_BINDING (b->id) = b->shadowed;
5258 /* Other things that might be encountered. */
5265 b = free_binding_and_advance (b);
5268 arg_info->parms = parms;
5269 arg_info->tags = tags;
5270 arg_info->types = types;
5271 arg_info->others = others;
5272 arg_info->pending_sizes = get_pending_sizes ();
5276 /* Get the struct, enum or union (CODE says which) with tag NAME.
5277 Define the tag as a forward-reference if it is not defined.
5278 Return a c_typespec structure for the type specifier. */
5281 parser_xref_tag (enum tree_code code, tree name)
5283 struct c_typespec ret;
5284 /* If a cross reference is requested, look up the type
5285 already defined for this tag and return it. */
5287 tree ref = lookup_tag (code, name, 0);
5288 /* If this is the right type of tag, return what we found.
5289 (This reference will be shadowed by shadow_tag later if appropriate.)
5290 If this is the wrong type of tag, do not return it. If it was the
5291 wrong type in the same scope, we will have had an error
5292 message already; if in a different scope and declaring
5293 a name, pending_xref_error will give an error message; but if in a
5294 different scope and not declaring a name, this tag should
5295 shadow the previous declaration of a different type of tag, and
5296 this would not work properly if we return the reference found.
5297 (For example, with "struct foo" in an outer scope, "union foo;"
5298 must shadow that tag with a new one of union type.) */
5299 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5300 if (ref && TREE_CODE (ref) == code)
5306 /* If no such tag is yet defined, create a forward-reference node
5307 and record it as the "definition".
5308 When a real declaration of this type is found,
5309 the forward-reference will be altered into a real type. */
5311 ref = make_node (code);
5312 if (code == ENUMERAL_TYPE)
5314 /* Give the type a default layout like unsigned int
5315 to avoid crashing if it does not get defined. */
5316 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5317 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5318 TYPE_USER_ALIGN (ref) = 0;
5319 TYPE_UNSIGNED (ref) = 1;
5320 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5321 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5322 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5325 pushtag (name, ref);
5331 /* Get the struct, enum or union (CODE says which) with tag NAME.
5332 Define the tag as a forward-reference if it is not defined.
5333 Return a tree for the type. */
5336 xref_tag (enum tree_code code, tree name)
5338 return parser_xref_tag (code, name).spec;
5341 /* Make sure that the tag NAME is defined *in the current scope*
5342 at least as a forward reference.
5343 CODE says which kind of tag NAME ought to be. */
5346 start_struct (enum tree_code code, tree name)
5348 /* If there is already a tag defined at this scope
5349 (as a forward reference), just return it. */
5354 ref = lookup_tag (code, name, 1);
5355 if (ref && TREE_CODE (ref) == code)
5357 if (TYPE_SIZE (ref))
5359 if (code == UNION_TYPE)
5360 error ("redefinition of %<union %E%>", name);
5362 error ("redefinition of %<struct %E%>", name);
5364 else if (C_TYPE_BEING_DEFINED (ref))
5366 if (code == UNION_TYPE)
5367 error ("nested redefinition of %<union %E%>", name);
5369 error ("nested redefinition of %<struct %E%>", name);
5370 /* Don't create structures that contain themselves. */
5375 /* Otherwise create a forward-reference just so the tag is in scope. */
5377 if (ref == NULL_TREE || TREE_CODE (ref) != code)
5379 ref = make_node (code);
5380 pushtag (name, ref);
5383 C_TYPE_BEING_DEFINED (ref) = 1;
5384 TYPE_PACKED (ref) = flag_pack_struct;
5388 /* Process the specs, declarator and width (NULL if omitted)
5389 of a structure component, returning a FIELD_DECL node.
5390 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5392 This is done during the parsing of the struct declaration.
5393 The FIELD_DECL nodes are chained together and the lot of them
5394 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5397 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5402 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5403 && width == NULL_TREE)
5405 /* This is an unnamed decl.
5407 If we have something of the form "union { list } ;" then this
5408 is the anonymous union extension. Similarly for struct.
5410 If this is something of the form "struct foo;", then
5411 If MS extensions are enabled, this is handled as an
5413 Otherwise this is a forward declaration of a structure tag.
5415 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5416 If MS extensions are enabled and foo names a structure, then
5417 again this is an anonymous struct.
5418 Otherwise this is an error.
5420 Oh what a horrid tangled web we weave. I wonder if MS consciously
5421 took this from Plan 9 or if it was an accident of implementation
5422 that took root before someone noticed the bug... */
5424 tree type = declspecs->type;
5425 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5426 || TREE_CODE (type) == UNION_TYPE);
5430 && (flag_ms_extensions || !declspecs->typedef_p))
5432 if (flag_ms_extensions)
5436 else if (TYPE_NAME (type) == NULL)
5443 pedwarn ("declaration does not declare anything");
5447 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5450 value = grokdeclarator (declarator, declspecs, FIELD, false,
5451 width ? &width : NULL, DEPRECATED_NORMAL);
5453 finish_decl (value, NULL_TREE, NULL_TREE);
5454 DECL_INITIAL (value) = width;
5459 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5460 the list such that this does not present a problem later. */
5463 detect_field_duplicates (tree fieldlist)
5468 /* First, see if there are more than "a few" fields.
5469 This is trivially true if there are zero or one fields. */
5472 x = TREE_CHAIN (fieldlist);
5478 } while (timeout > 0 && x);
5480 /* If there were "few" fields, avoid the overhead of allocating
5481 a hash table. Instead just do the nested traversal thing. */
5484 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5487 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5488 if (DECL_NAME (y) == DECL_NAME (x))
5490 error ("duplicate member %q+D", x);
5491 DECL_NAME (x) = NULL_TREE;
5497 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5500 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5501 if ((y = DECL_NAME (x)) != 0)
5503 slot = htab_find_slot (htab, y, INSERT);
5506 error ("duplicate member %q+D", x);
5507 DECL_NAME (x) = NULL_TREE;
5516 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5517 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5518 ATTRIBUTES are attributes to be applied to the structure. */
5521 finish_struct (tree t, tree fieldlist, tree attributes)
5524 bool toplevel = file_scope == current_scope;
5525 int saw_named_field;
5527 /* If this type was previously laid out as a forward reference,
5528 make sure we lay it out again. */
5532 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5536 for (x = fieldlist; x; x = TREE_CHAIN (x))
5537 if (DECL_NAME (x) != 0)
5542 if (TREE_CODE (t) == UNION_TYPE)
5545 pedwarn ("union has no named members");
5547 pedwarn ("union has no members");
5552 pedwarn ("struct has no named members");
5554 pedwarn ("struct has no members");
5559 /* Install struct as DECL_CONTEXT of each field decl.
5560 Also process specified field sizes, found in the DECL_INITIAL,
5561 storing 0 there after the type has been changed to precision equal
5562 to its width, rather than the precision of the specified standard
5563 type. (Correct layout requires the original type to have been preserved
5566 saw_named_field = 0;
5567 for (x = fieldlist; x; x = TREE_CHAIN (x))
5569 if (TREE_TYPE (x) == error_mark_node)
5572 DECL_CONTEXT (x) = t;
5574 if (TYPE_PACKED (t) && TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)
5575 DECL_PACKED (x) = 1;
5577 /* If any field is const, the structure type is pseudo-const. */
5578 if (TREE_READONLY (x))
5579 C_TYPE_FIELDS_READONLY (t) = 1;
5582 /* A field that is pseudo-const makes the structure likewise. */
5583 tree t1 = TREE_TYPE (x);
5584 while (TREE_CODE (t1) == ARRAY_TYPE)
5585 t1 = TREE_TYPE (t1);
5586 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5587 && C_TYPE_FIELDS_READONLY (t1))
5588 C_TYPE_FIELDS_READONLY (t) = 1;
5591 /* Any field that is volatile means variables of this type must be
5592 treated in some ways as volatile. */
5593 if (TREE_THIS_VOLATILE (x))
5594 C_TYPE_FIELDS_VOLATILE (t) = 1;
5596 /* Any field of nominal variable size implies structure is too. */
5597 if (C_DECL_VARIABLE_SIZE (x))
5598 C_TYPE_VARIABLE_SIZE (t) = 1;
5600 if (DECL_INITIAL (x))
5602 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5603 DECL_SIZE (x) = bitsize_int (width);
5604 DECL_BIT_FIELD (x) = 1;
5605 SET_DECL_C_BIT_FIELD (x);
5608 /* Detect flexible array member in an invalid context. */
5609 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5610 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5611 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5612 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5614 if (TREE_CODE (t) == UNION_TYPE)
5616 error ("%Jflexible array member in union", x);
5617 TREE_TYPE (x) = error_mark_node;
5619 else if (TREE_CHAIN (x) != NULL_TREE)
5621 error ("%Jflexible array member not at end of struct", x);
5622 TREE_TYPE (x) = error_mark_node;
5624 else if (!saw_named_field)
5626 error ("%Jflexible array member in otherwise empty struct", x);
5627 TREE_TYPE (x) = error_mark_node;
5631 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5632 && flexible_array_type_p (TREE_TYPE (x)))
5633 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5636 saw_named_field = 1;
5639 detect_field_duplicates (fieldlist);
5641 /* Now we have the nearly final fieldlist. Record it,
5642 then lay out the structure or union (including the fields). */
5644 TYPE_FIELDS (t) = fieldlist;
5648 /* Give bit-fields their proper types. */
5650 tree *fieldlistp = &fieldlist;
5652 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5653 && TREE_TYPE (*fieldlistp) != error_mark_node)
5655 unsigned HOST_WIDE_INT width
5656 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5657 tree type = TREE_TYPE (*fieldlistp);
5658 if (width != TYPE_PRECISION (type))
5660 TREE_TYPE (*fieldlistp)
5661 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5662 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5664 DECL_INITIAL (*fieldlistp) = 0;
5667 fieldlistp = &TREE_CHAIN (*fieldlistp);
5670 /* Now we have the truly final field list.
5671 Store it in this type and in the variants. */
5673 TYPE_FIELDS (t) = fieldlist;
5675 /* If there are lots of fields, sort so we can look through them fast.
5676 We arbitrarily consider 16 or more elts to be "a lot". */
5681 for (x = fieldlist; x; x = TREE_CHAIN (x))
5683 if (len > 15 || DECL_NAME (x) == NULL)
5691 struct lang_type *space;
5692 struct sorted_fields_type *space2;
5694 len += list_length (x);
5696 /* Use the same allocation policy here that make_node uses, to
5697 ensure that this lives as long as the rest of the struct decl.
5698 All decls in an inline function need to be saved. */
5700 space = GGC_CNEW (struct lang_type);
5701 space2 = GGC_NEWVAR (struct sorted_fields_type,
5702 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5706 field_array = &space2->elts[0];
5707 for (x = fieldlist; x; x = TREE_CHAIN (x))
5709 field_array[len++] = x;
5711 /* If there is anonymous struct or union, break out of the loop. */
5712 if (DECL_NAME (x) == NULL)
5715 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5718 TYPE_LANG_SPECIFIC (t) = space;
5719 TYPE_LANG_SPECIFIC (t)->s->len = len;
5720 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5721 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5726 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5728 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5729 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5730 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5731 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5732 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5735 /* If this was supposed to be a transparent union, but we can't
5736 make it one, warn and turn off the flag. */
5737 if (TREE_CODE (t) == UNION_TYPE
5738 && TYPE_TRANSPARENT_UNION (t)
5739 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5741 TYPE_TRANSPARENT_UNION (t) = 0;
5742 warning (0, "union cannot be made transparent");
5745 /* If this structure or union completes the type of any previous
5746 variable declaration, lay it out and output its rtl. */
5747 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5751 tree decl = TREE_VALUE (x);
5752 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5753 layout_array_type (TREE_TYPE (decl));
5754 if (TREE_CODE (decl) != TYPE_DECL)
5756 layout_decl (decl, 0);
5757 if (c_dialect_objc ())
5758 objc_check_decl (decl);
5759 rest_of_decl_compilation (decl, toplevel, 0);
5764 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5766 /* Finish debugging output for this type. */
5767 rest_of_type_compilation (t, toplevel);
5769 /* If we're inside a function proper, i.e. not file-scope and not still
5770 parsing parameters, then arrange for the size of a variable sized type
5772 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
5773 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5778 /* Lay out the type T, and its element type, and so on. */
5781 layout_array_type (tree t)
5783 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5784 layout_array_type (TREE_TYPE (t));
5788 /* Begin compiling the definition of an enumeration type.
5789 NAME is its name (or null if anonymous).
5790 Returns the type object, as yet incomplete.
5791 Also records info about it so that build_enumerator
5792 may be used to declare the individual values as they are read. */
5795 start_enum (struct c_enum_contents *the_enum, tree name)
5799 /* If this is the real definition for a previous forward reference,
5800 fill in the contents in the same object that used to be the
5801 forward reference. */
5804 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5806 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5808 enumtype = make_node (ENUMERAL_TYPE);
5809 pushtag (name, enumtype);
5812 if (C_TYPE_BEING_DEFINED (enumtype))
5813 error ("nested redefinition of %<enum %E%>", name);
5815 C_TYPE_BEING_DEFINED (enumtype) = 1;
5817 if (TYPE_VALUES (enumtype) != 0)
5819 /* This enum is a named one that has been declared already. */
5820 error ("redeclaration of %<enum %E%>", name);
5822 /* Completely replace its old definition.
5823 The old enumerators remain defined, however. */
5824 TYPE_VALUES (enumtype) = 0;
5827 the_enum->enum_next_value = integer_zero_node;
5828 the_enum->enum_overflow = 0;
5830 if (flag_short_enums)
5831 TYPE_PACKED (enumtype) = 1;
5836 /* After processing and defining all the values of an enumeration type,
5837 install their decls in the enumeration type and finish it off.
5838 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5839 and ATTRIBUTES are the specified attributes.
5840 Returns ENUMTYPE. */
5843 finish_enum (tree enumtype, tree values, tree attributes)
5846 tree minnode = 0, maxnode = 0;
5847 int precision, unsign;
5848 bool toplevel = (file_scope == current_scope);
5849 struct lang_type *lt;
5851 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5853 /* Calculate the maximum value of any enumerator in this type. */
5855 if (values == error_mark_node)
5856 minnode = maxnode = integer_zero_node;
5859 minnode = maxnode = TREE_VALUE (values);
5860 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5862 tree value = TREE_VALUE (pair);
5863 if (tree_int_cst_lt (maxnode, value))
5865 if (tree_int_cst_lt (value, minnode))
5870 /* Construct the final type of this enumeration. It is the same
5871 as one of the integral types - the narrowest one that fits, except
5872 that normally we only go as narrow as int - and signed iff any of
5873 the values are negative. */
5874 unsign = (tree_int_cst_sgn (minnode) >= 0);
5875 precision = MAX (min_precision (minnode, unsign),
5876 min_precision (maxnode, unsign));
5878 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5880 tem = c_common_type_for_size (precision, unsign);
5883 warning (0, "enumeration values exceed range of largest integer");
5884 tem = long_long_integer_type_node;
5888 tem = unsign ? unsigned_type_node : integer_type_node;
5890 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5891 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5892 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5893 TYPE_SIZE (enumtype) = 0;
5895 /* If the precision of the type was specific with an attribute and it
5896 was too small, give an error. Otherwise, use it. */
5897 if (TYPE_PRECISION (enumtype))
5899 if (precision > TYPE_PRECISION (enumtype))
5900 error ("specified mode too small for enumeral values");
5903 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5905 layout_type (enumtype);
5907 if (values != error_mark_node)
5909 /* Change the type of the enumerators to be the enum type. We
5910 need to do this irrespective of the size of the enum, for
5911 proper type checking. Replace the DECL_INITIALs of the
5912 enumerators, and the value slots of the list, with copies
5913 that have the enum type; they cannot be modified in place
5914 because they may be shared (e.g. integer_zero_node) Finally,
5915 change the purpose slots to point to the names of the decls. */
5916 for (pair = values; pair; pair = TREE_CHAIN (pair))
5918 tree enu = TREE_PURPOSE (pair);
5919 tree ini = DECL_INITIAL (enu);
5921 TREE_TYPE (enu) = enumtype;
5923 /* The ISO C Standard mandates enumerators to have type int,
5924 even though the underlying type of an enum type is
5925 unspecified. Here we convert any enumerators that fit in
5926 an int to type int, to avoid promotions to unsigned types
5927 when comparing integers with enumerators that fit in the
5928 int range. When -pedantic is given, build_enumerator()
5929 would have already taken care of those that don't fit. */
5930 if (int_fits_type_p (ini, integer_type_node))
5931 tem = integer_type_node;
5934 ini = convert (tem, ini);
5936 DECL_INITIAL (enu) = ini;
5937 TREE_PURPOSE (pair) = DECL_NAME (enu);
5938 TREE_VALUE (pair) = ini;
5941 TYPE_VALUES (enumtype) = values;
5944 /* Record the min/max values so that we can warn about bit-field
5945 enumerations that are too small for the values. */
5946 lt = GGC_CNEW (struct lang_type);
5947 lt->enum_min = minnode;
5948 lt->enum_max = maxnode;
5949 TYPE_LANG_SPECIFIC (enumtype) = lt;
5951 /* Fix up all variant types of this enum type. */
5952 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5954 if (tem == enumtype)
5956 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5957 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5958 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5959 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5960 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5961 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5962 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5963 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5964 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5965 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5966 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5969 /* Finish debugging output for this type. */
5970 rest_of_type_compilation (enumtype, toplevel);
5975 /* Build and install a CONST_DECL for one value of the
5976 current enumeration type (one that was begun with start_enum).
5977 Return a tree-list containing the CONST_DECL and its value.
5978 Assignment of sequential values by default is handled here. */
5981 build_enumerator (struct c_enum_contents *the_enum, tree name, tree value)
5985 /* Validate and default VALUE. */
5989 /* Don't issue more errors for error_mark_node (i.e. an
5990 undeclared identifier) - just ignore the value expression. */
5991 if (value == error_mark_node)
5993 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5994 || TREE_CODE (value) != INTEGER_CST)
5996 error ("enumerator value for %qE is not an integer constant", name);
6001 value = default_conversion (value);
6002 constant_expression_warning (value);
6006 /* Default based on previous value. */
6007 /* It should no longer be possible to have NON_LVALUE_EXPR
6011 value = the_enum->enum_next_value;
6012 if (the_enum->enum_overflow)
6013 error ("overflow in enumeration values");
6016 if (pedantic && !int_fits_type_p (value, integer_type_node))
6018 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
6019 /* XXX This causes -pedantic to change the meaning of the program.
6020 Remove? -zw 2004-03-15 */
6021 value = convert (integer_type_node, value);
6024 /* Set basis for default for next value. */
6025 the_enum->enum_next_value = build_binary_op (PLUS_EXPR, value,
6026 integer_one_node, 0);
6027 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
6029 /* Now create a declaration for the enum value name. */
6031 type = TREE_TYPE (value);
6032 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
6033 TYPE_PRECISION (integer_type_node)),
6034 (TYPE_PRECISION (type)
6035 >= TYPE_PRECISION (integer_type_node)
6036 && TYPE_UNSIGNED (type)));
6038 decl = build_decl (CONST_DECL, name, type);
6039 DECL_INITIAL (decl) = convert (type, value);
6042 return tree_cons (decl, value, NULL_TREE);
6046 /* Create the FUNCTION_DECL for a function definition.
6047 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6048 the declaration; they describe the function's name and the type it returns,
6049 but twisted together in a fashion that parallels the syntax of C.
6051 This function creates a binding context for the function body
6052 as well as setting up the FUNCTION_DECL in current_function_decl.
6054 Returns 1 on success. If the DECLARATOR is not suitable for a function
6055 (it defines a datum instead), we return 0, which tells
6056 yyparse to report a parse error. */
6059 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
6062 tree decl1, old_decl;
6063 tree restype, resdecl;
6064 struct c_label_context_se *nstack_se;
6065 struct c_label_context_vm *nstack_vm;
6067 current_function_returns_value = 0; /* Assume, until we see it does. */
6068 current_function_returns_null = 0;
6069 current_function_returns_abnormally = 0;
6070 warn_about_return_type = 0;
6071 c_switch_stack = NULL;
6073 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
6074 nstack_se->labels_def = NULL;
6075 nstack_se->labels_used = NULL;
6076 nstack_se->next = label_context_stack_se;
6077 label_context_stack_se = nstack_se;
6079 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
6080 nstack_vm->labels_def = NULL;
6081 nstack_vm->labels_used = NULL;
6082 nstack_vm->scope = 0;
6083 nstack_vm->next = label_context_stack_vm;
6084 label_context_stack_vm = nstack_vm;
6086 /* Indicate no valid break/continue context by setting these variables
6087 to some non-null, non-label value. We'll notice and emit the proper
6088 error message in c_finish_bc_stmt. */
6089 c_break_label = c_cont_label = size_zero_node;
6091 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
6094 /* If the declarator is not suitable for a function definition,
6095 cause a syntax error. */
6098 label_context_stack_se = label_context_stack_se->next;
6099 label_context_stack_vm = label_context_stack_vm->next;
6103 decl_attributes (&decl1, attributes, 0);
6105 if (DECL_DECLARED_INLINE_P (decl1)
6106 && DECL_UNINLINABLE (decl1)
6107 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6108 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
6111 /* Handle gnu_inline attribute. */
6112 if (declspecs->inline_p
6113 && !flag_gnu89_inline
6114 && TREE_CODE (decl1) == FUNCTION_DECL
6115 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1)))
6117 if (declspecs->storage_class != csc_static)
6118 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
6121 announce_function (decl1);
6123 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6125 error ("return type is an incomplete type");
6126 /* Make it return void instead. */
6128 = build_function_type (void_type_node,
6129 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6132 if (warn_about_return_type)
6133 pedwarn_c99 ("return type defaults to %<int%>");
6135 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6136 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6137 DECL_INITIAL (decl1) = error_mark_node;
6139 /* If this definition isn't a prototype and we had a prototype declaration
6140 before, copy the arg type info from that prototype. */
6141 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
6142 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
6144 current_function_prototype_locus = UNKNOWN_LOCATION;
6145 current_function_prototype_built_in = false;
6146 current_function_prototype_arg_types = NULL_TREE;
6147 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6149 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6150 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6151 TREE_TYPE (TREE_TYPE (old_decl))))
6153 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
6155 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
6156 current_function_prototype_built_in
6157 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
6158 current_function_prototype_arg_types
6159 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
6161 if (TREE_PUBLIC (decl1))
6163 /* If there is an external prototype declaration of this
6164 function, record its location but do not copy information
6165 to this decl. This may be an invisible declaration
6166 (built-in or in a scope which has finished) or simply
6167 have more refined argument types than any declaration
6169 struct c_binding *b;
6170 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
6171 if (B_IN_SCOPE (b, external_scope))
6175 tree ext_decl, ext_type;
6177 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
6178 if (TREE_CODE (ext_type) == FUNCTION_TYPE
6179 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6180 TREE_TYPE (ext_type)))
6182 current_function_prototype_locus
6183 = DECL_SOURCE_LOCATION (ext_decl);
6184 current_function_prototype_built_in
6185 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
6186 current_function_prototype_arg_types
6187 = TYPE_ARG_TYPES (ext_type);
6193 /* Optionally warn of old-fashioned def with no previous prototype. */
6194 if (warn_strict_prototypes
6195 && old_decl != error_mark_node
6196 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6197 && C_DECL_ISNT_PROTOTYPE (old_decl))
6198 warning (OPT_Wstrict_prototypes,
6199 "function declaration isn%'t a prototype");
6200 /* Optionally warn of any global def with no previous prototype. */
6201 else if (warn_missing_prototypes
6202 && old_decl != error_mark_node
6203 && TREE_PUBLIC (decl1)
6204 && !MAIN_NAME_P (DECL_NAME (decl1))
6205 && C_DECL_ISNT_PROTOTYPE (old_decl))
6206 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
6207 /* Optionally warn of any def with no previous prototype
6208 if the function has already been used. */
6209 else if (warn_missing_prototypes
6211 && old_decl != error_mark_node
6212 && TREE_USED (old_decl)
6213 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6214 warning (OPT_Wmissing_prototypes,
6215 "%q+D was used with no prototype before its definition", decl1);
6216 /* Optionally warn of any global def with no previous declaration. */
6217 else if (warn_missing_declarations
6218 && TREE_PUBLIC (decl1)
6220 && !MAIN_NAME_P (DECL_NAME (decl1)))
6221 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
6223 /* Optionally warn of any def with no previous declaration
6224 if the function has already been used. */
6225 else if (warn_missing_declarations
6227 && old_decl != error_mark_node
6228 && TREE_USED (old_decl)
6229 && C_DECL_IMPLICIT (old_decl))
6230 warning (OPT_Wmissing_declarations,
6231 "%q+D was used with no declaration before its definition", decl1);
6233 /* This function exists in static storage.
6234 (This does not mean `static' in the C sense!) */
6235 TREE_STATIC (decl1) = 1;
6237 /* A nested function is not global. */
6238 if (current_function_decl != 0)
6239 TREE_PUBLIC (decl1) = 0;
6241 /* This is the earliest point at which we might know the assembler
6242 name of the function. Thus, if it's set before this, die horribly. */
6243 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
6245 /* If #pragma weak was used, mark the decl weak now. */
6246 if (current_scope == file_scope)
6247 maybe_apply_pragma_weak (decl1);
6249 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6250 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6252 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6253 != integer_type_node)
6254 pedwarn ("return type of %q+D is not %<int%>", decl1);
6256 check_main_parameter_types(decl1);
6258 if (!TREE_PUBLIC (decl1))
6259 pedwarn ("%q+D is normally a non-static function", decl1);
6262 /* Record the decl so that the function name is defined.
6263 If we already have a decl for this name, and it is a FUNCTION_DECL,
6264 use the old decl. */
6266 current_function_decl = pushdecl (decl1);
6269 declare_parm_level ();
6271 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6272 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6273 DECL_ARTIFICIAL (resdecl) = 1;
6274 DECL_IGNORED_P (resdecl) = 1;
6275 DECL_RESULT (current_function_decl) = resdecl;
6277 start_fname_decls ();
6282 /* Subroutine of store_parm_decls which handles new-style function
6283 definitions (prototype format). The parms already have decls, so we
6284 need only record them as in effect and complain if any redundant
6285 old-style parm decls were written. */
6287 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6291 if (current_scope->bindings)
6293 error ("%Jold-style parameter declarations in prototyped "
6294 "function definition", fndecl);
6296 /* Get rid of the old-style declarations. */
6300 /* Don't issue this warning for nested functions, and don't issue this
6301 warning if we got here because ARG_INFO_TYPES was error_mark_node
6302 (this happens when a function definition has just an ellipsis in
6303 its parameter list). */
6304 else if (!in_system_header && !current_function_scope
6305 && arg_info->types != error_mark_node)
6306 warning (OPT_Wtraditional,
6307 "%Jtraditional C rejects ISO C style function definitions",
6310 /* Now make all the parameter declarations visible in the function body.
6311 We can bypass most of the grunt work of pushdecl. */
6312 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6314 DECL_CONTEXT (decl) = current_function_decl;
6315 if (DECL_NAME (decl))
6317 bind (DECL_NAME (decl), decl, current_scope,
6318 /*invisible=*/false, /*nested=*/false);
6319 if (!TREE_USED (decl))
6320 warn_if_shadowing (decl);
6323 error ("%Jparameter name omitted", decl);
6326 /* Record the parameter list in the function declaration. */
6327 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6329 /* Now make all the ancillary declarations visible, likewise. */
6330 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6332 DECL_CONTEXT (decl) = current_function_decl;
6333 if (DECL_NAME (decl))
6334 bind (DECL_NAME (decl), decl, current_scope,
6335 /*invisible=*/false, /*nested=*/false);
6338 /* And all the tag declarations. */
6339 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6340 if (TREE_PURPOSE (decl))
6341 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6342 /*invisible=*/false, /*nested=*/false);
6345 /* Subroutine of store_parm_decls which handles old-style function
6346 definitions (separate parameter list and declarations). */
6349 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6351 struct c_binding *b;
6352 tree parm, decl, last;
6353 tree parmids = arg_info->parms;
6354 struct pointer_set_t *seen_args = pointer_set_create ();
6356 if (!in_system_header)
6357 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6360 /* Match each formal parameter name with its declaration. Save each
6361 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6362 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6364 if (TREE_VALUE (parm) == 0)
6366 error ("%Jparameter name missing from parameter list", fndecl);
6367 TREE_PURPOSE (parm) = 0;
6371 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6372 if (b && B_IN_CURRENT_SCOPE (b))
6375 /* If we got something other than a PARM_DECL it is an error. */
6376 if (TREE_CODE (decl) != PARM_DECL)
6377 error ("%q+D declared as a non-parameter", decl);
6378 /* If the declaration is already marked, we have a duplicate
6379 name. Complain and ignore the duplicate. */
6380 else if (pointer_set_contains (seen_args, decl))
6382 error ("multiple parameters named %q+D", decl);
6383 TREE_PURPOSE (parm) = 0;
6386 /* If the declaration says "void", complain and turn it into
6388 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6390 error ("parameter %q+D declared with void type", decl);
6391 TREE_TYPE (decl) = integer_type_node;
6392 DECL_ARG_TYPE (decl) = integer_type_node;
6393 layout_decl (decl, 0);
6395 warn_if_shadowing (decl);
6397 /* If no declaration found, default to int. */
6400 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6401 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6402 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6404 warn_if_shadowing (decl);
6407 pedwarn ("type of %q+D defaults to %<int%>", decl);
6409 warning (OPT_Wmissing_parameter_type, "type of %q+D defaults to %<int%>", decl);
6412 TREE_PURPOSE (parm) = decl;
6413 pointer_set_insert (seen_args, decl);
6416 /* Now examine the parms chain for incomplete declarations
6417 and declarations with no corresponding names. */
6419 for (b = current_scope->bindings; b; b = b->prev)
6422 if (TREE_CODE (parm) != PARM_DECL)
6425 if (TREE_TYPE (parm) != error_mark_node
6426 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6428 error ("parameter %q+D has incomplete type", parm);
6429 TREE_TYPE (parm) = error_mark_node;
6432 if (!pointer_set_contains (seen_args, parm))
6434 error ("declaration for parameter %q+D but no such parameter", parm);
6436 /* Pretend the parameter was not missing.
6437 This gets us to a standard state and minimizes
6438 further error messages. */
6439 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6443 /* Chain the declarations together in the order of the list of
6444 names. Store that chain in the function decl, replacing the
6445 list of names. Update the current scope to match. */
6446 DECL_ARGUMENTS (fndecl) = 0;
6448 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6449 if (TREE_PURPOSE (parm))
6451 if (parm && TREE_PURPOSE (parm))
6453 last = TREE_PURPOSE (parm);
6454 DECL_ARGUMENTS (fndecl) = last;
6456 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6457 if (TREE_PURPOSE (parm))
6459 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6460 last = TREE_PURPOSE (parm);
6462 TREE_CHAIN (last) = 0;
6465 pointer_set_destroy (seen_args);
6467 /* If there was a previous prototype,
6468 set the DECL_ARG_TYPE of each argument according to
6469 the type previously specified, and report any mismatches. */
6471 if (current_function_prototype_arg_types)
6474 for (parm = DECL_ARGUMENTS (fndecl),
6475 type = current_function_prototype_arg_types;
6476 parm || (type && TREE_VALUE (type) != error_mark_node
6477 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
6478 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6480 if (parm == 0 || type == 0
6481 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6483 if (current_function_prototype_built_in)
6484 warning (0, "number of arguments doesn%'t match "
6485 "built-in prototype");
6488 error ("number of arguments doesn%'t match prototype");
6489 error ("%Hprototype declaration",
6490 ¤t_function_prototype_locus);
6494 /* Type for passing arg must be consistent with that
6495 declared for the arg. ISO C says we take the unqualified
6496 type for parameters declared with qualified type. */
6497 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6498 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6500 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6501 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6503 /* Adjust argument to match prototype. E.g. a previous
6504 `int foo(float);' prototype causes
6505 `int foo(x) float x; {...}' to be treated like
6506 `int foo(float x) {...}'. This is particularly
6507 useful for argument types like uid_t. */
6508 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6510 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6511 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6512 && TYPE_PRECISION (TREE_TYPE (parm))
6513 < TYPE_PRECISION (integer_type_node))
6514 DECL_ARG_TYPE (parm) = integer_type_node;
6518 /* ??? Is it possible to get here with a
6519 built-in prototype or will it always have
6520 been diagnosed as conflicting with an
6521 old-style definition and discarded? */
6522 if (current_function_prototype_built_in)
6523 warning (0, "promoted argument %qD "
6524 "doesn%'t match built-in prototype", parm);
6527 pedwarn ("promoted argument %qD "
6528 "doesn%'t match prototype", parm);
6529 pedwarn ("%Hprototype declaration",
6530 ¤t_function_prototype_locus);
6536 if (current_function_prototype_built_in)
6537 warning (0, "argument %qD doesn%'t match "
6538 "built-in prototype", parm);
6541 error ("argument %qD doesn%'t match prototype", parm);
6542 error ("%Hprototype declaration",
6543 ¤t_function_prototype_locus);
6548 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6551 /* Otherwise, create a prototype that would match. */
6555 tree actual = 0, last = 0, type;
6557 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6559 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6561 TREE_CHAIN (last) = type;
6566 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6568 TREE_CHAIN (last) = type;
6572 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6573 of the type of this function, but we need to avoid having this
6574 affect the types of other similarly-typed functions, so we must
6575 first force the generation of an identical (but separate) type
6576 node for the relevant function type. The new node we create
6577 will be a variant of the main variant of the original function
6580 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6582 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6586 /* Store parameter declarations passed in ARG_INFO into the current
6587 function declaration. */
6590 store_parm_decls_from (struct c_arg_info *arg_info)
6592 current_function_arg_info = arg_info;
6593 store_parm_decls ();
6596 /* Store the parameter declarations into the current function declaration.
6597 This is called after parsing the parameter declarations, before
6598 digesting the body of the function.
6600 For an old-style definition, construct a prototype out of the old-style
6601 parameter declarations and inject it into the function's type. */
6604 store_parm_decls (void)
6606 tree fndecl = current_function_decl;
6609 /* The argument information block for FNDECL. */
6610 struct c_arg_info *arg_info = current_function_arg_info;
6611 current_function_arg_info = 0;
6613 /* True if this definition is written with a prototype. Note:
6614 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6615 list in a function definition as equivalent to (void) -- an
6616 empty argument list specifies the function has no parameters,
6617 but only (void) sets up a prototype for future calls. */
6618 proto = arg_info->types != 0;
6621 store_parm_decls_newstyle (fndecl, arg_info);
6623 store_parm_decls_oldstyle (fndecl, arg_info);
6625 /* The next call to push_scope will be a function body. */
6627 next_is_function_body = true;
6629 /* Write a record describing this function definition to the prototypes
6630 file (if requested). */
6632 gen_aux_info_record (fndecl, 1, 0, proto);
6634 /* Initialize the RTL code for the function. */
6635 allocate_struct_function (fndecl);
6637 /* Begin the statement tree for this function. */
6638 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6640 /* ??? Insert the contents of the pending sizes list into the function
6641 to be evaluated. The only reason left to have this is
6642 void foo(int n, int array[n++])
6643 because we throw away the array type in favor of a pointer type, and
6644 thus won't naturally see the SAVE_EXPR containing the increment. All
6645 other pending sizes would be handled by gimplify_parameters. */
6648 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6649 add_stmt (TREE_VALUE (t));
6652 /* Even though we're inside a function body, we still don't want to
6653 call expand_expr to calculate the size of a variable-sized array.
6654 We haven't necessarily assigned RTL to all variables yet, so it's
6655 not safe to try to expand expressions involving them. */
6656 cfun->x_dont_save_pending_sizes_p = 1;
6659 /* Emit diagnostics that require gimple input for detection. Operate on
6660 FNDECL and all its nested functions. */
6663 c_gimple_diagnostics_recursively (tree fndecl)
6665 struct cgraph_node *cgn;
6667 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6668 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6670 /* Notice when OpenMP structured block constraints are violated. */
6672 diagnose_omp_structured_block_errors (fndecl);
6674 /* Finalize all nested functions now. */
6675 cgn = cgraph_node (fndecl);
6676 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6677 c_gimple_diagnostics_recursively (cgn->decl);
6680 /* Finish up a function declaration and compile that function
6681 all the way to assembler language output. The free the storage
6682 for the function definition.
6684 This is called after parsing the body of the function definition. */
6687 finish_function (void)
6689 tree fndecl = current_function_decl;
6691 label_context_stack_se = label_context_stack_se->next;
6692 label_context_stack_vm = label_context_stack_vm->next;
6694 if (TREE_CODE (fndecl) == FUNCTION_DECL
6695 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6697 tree args = DECL_ARGUMENTS (fndecl);
6698 for (; args; args = TREE_CHAIN (args))
6700 tree type = TREE_TYPE (args);
6701 if (INTEGRAL_TYPE_P (type)
6702 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6703 DECL_ARG_TYPE (args) = integer_type_node;
6707 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6708 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6710 /* Must mark the RESULT_DECL as being in this function. */
6712 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6713 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6715 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6717 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6718 != integer_type_node)
6720 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6721 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6723 pedwarn ("return type of %q+D is not %<int%>", fndecl);
6729 tree stmt = c_finish_return (integer_zero_node);
6730 #ifdef USE_MAPPED_LOCATION
6731 /* Hack. We don't want the middle-end to warn that this return
6732 is unreachable, so we mark its location as special. Using
6733 UNKNOWN_LOCATION has the problem that it gets clobbered in
6734 annotate_one_with_locus. A cleaner solution might be to
6735 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6737 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6739 /* Hack. We don't want the middle-end to warn that this
6740 return is unreachable, so put the statement on the
6742 annotate_with_file_line (stmt, input_filename, 0);
6748 /* Tie off the statement tree for this function. */
6749 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6751 finish_fname_decls ();
6753 /* Complain if there's just no return statement. */
6754 if (warn_return_type
6755 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6756 && !current_function_returns_value && !current_function_returns_null
6757 /* Don't complain if we are no-return. */
6758 && !current_function_returns_abnormally
6759 /* Don't warn for main(). */
6760 && !MAIN_NAME_P (DECL_NAME (fndecl))
6761 /* Or if they didn't actually specify a return type. */
6762 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6763 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6764 inline function, as we might never be compiled separately. */
6765 && DECL_INLINE (fndecl))
6767 warning (OPT_Wreturn_type,
6768 "no return statement in function returning non-void");
6769 TREE_NO_WARNING (fndecl) = 1;
6772 /* Store the end of the function, so that we get good line number
6773 info for the epilogue. */
6774 cfun->function_end_locus = input_location;
6776 /* Finalize the ELF visibility for the function. */
6777 c_determine_visibility (fndecl);
6779 /* Genericize before inlining. Delay genericizing nested functions
6780 until their parent function is genericized. Since finalizing
6781 requires GENERIC, delay that as well. */
6783 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6784 && !undef_nested_function)
6786 if (!decl_function_context (fndecl))
6788 c_genericize (fndecl);
6789 c_gimple_diagnostics_recursively (fndecl);
6791 /* ??? Objc emits functions after finalizing the compilation unit.
6792 This should be cleaned up later and this conditional removed. */
6793 if (cgraph_global_info_ready)
6795 c_expand_body (fndecl);
6799 cgraph_finalize_function (fndecl, false);
6803 /* Register this function with cgraph just far enough to get it
6804 added to our parent's nested function list. Handy, since the
6805 C front end doesn't have such a list. */
6806 (void) cgraph_node (fndecl);
6810 if (!decl_function_context (fndecl))
6811 undef_nested_function = false;
6813 /* We're leaving the context of this function, so zap cfun.
6814 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6815 tree_rest_of_compilation. */
6817 current_function_decl = NULL;
6820 /* Check the declarations given in a for-loop for satisfying the C99
6821 constraints. If exactly one such decl is found, return it. */
6824 check_for_loop_decls (void)
6826 struct c_binding *b;
6827 tree one_decl = NULL_TREE;
6833 /* If we get here, declarations have been used in a for loop without
6834 the C99 for loop scope. This doesn't make much sense, so don't
6836 error ("%<for%> loop initial declaration used outside C99 mode");
6839 /* C99 subclause 6.8.5 paragraph 3:
6841 [#3] The declaration part of a for statement shall only
6842 declare identifiers for objects having storage class auto or
6845 It isn't clear whether, in this sentence, "identifiers" binds to
6846 "shall only declare" or to "objects" - that is, whether all identifiers
6847 declared must be identifiers for objects, or whether the restriction
6848 only applies to those that are. (A question on this in comp.std.c
6849 in November 2000 received no answer.) We implement the strictest
6850 interpretation, to avoid creating an extension which later causes
6853 for (b = current_scope->bindings; b; b = b->prev)
6856 tree decl = b->decl;
6861 switch (TREE_CODE (decl))
6864 if (TREE_STATIC (decl))
6865 error ("declaration of static variable %q+D in %<for%> loop "
6866 "initial declaration", decl);
6867 else if (DECL_EXTERNAL (decl))
6868 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6869 "initial declaration", decl);
6873 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6877 error ("%<union %E%> declared in %<for%> loop initial declaration",
6881 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6885 error ("declaration of non-variable %q+D in %<for%> loop "
6886 "initial declaration", decl);
6893 return n_decls == 1 ? one_decl : NULL_TREE;
6896 /* Save and reinitialize the variables
6897 used during compilation of a C function. */
6900 c_push_function_context (struct function *f)
6902 struct language_function *p;
6903 p = GGC_NEW (struct language_function);
6906 p->base.x_stmt_tree = c_stmt_tree;
6907 p->x_break_label = c_break_label;
6908 p->x_cont_label = c_cont_label;
6909 p->x_switch_stack = c_switch_stack;
6910 p->arg_info = current_function_arg_info;
6911 p->returns_value = current_function_returns_value;
6912 p->returns_null = current_function_returns_null;
6913 p->returns_abnormally = current_function_returns_abnormally;
6914 p->warn_about_return_type = warn_about_return_type;
6917 /* Restore the variables used during compilation of a C function. */
6920 c_pop_function_context (struct function *f)
6922 struct language_function *p = f->language;
6924 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6925 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6927 /* Stop pointing to the local nodes about to be freed. */
6928 /* But DECL_INITIAL must remain nonzero so we know this
6929 was an actual function definition. */
6930 DECL_INITIAL (current_function_decl) = error_mark_node;
6931 DECL_ARGUMENTS (current_function_decl) = 0;
6934 c_stmt_tree = p->base.x_stmt_tree;
6935 c_break_label = p->x_break_label;
6936 c_cont_label = p->x_cont_label;
6937 c_switch_stack = p->x_switch_stack;
6938 current_function_arg_info = p->arg_info;
6939 current_function_returns_value = p->returns_value;
6940 current_function_returns_null = p->returns_null;
6941 current_function_returns_abnormally = p->returns_abnormally;
6942 warn_about_return_type = p->warn_about_return_type;
6947 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6950 c_dup_lang_specific_decl (tree decl)
6952 struct lang_decl *ld;
6954 if (!DECL_LANG_SPECIFIC (decl))
6957 ld = GGC_NEW (struct lang_decl);
6958 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6959 DECL_LANG_SPECIFIC (decl) = ld;
6962 /* The functions below are required for functionality of doing
6963 function at once processing in the C front end. Currently these
6964 functions are not called from anywhere in the C front end, but as
6965 these changes continue, that will change. */
6967 /* Returns the stmt_tree (if any) to which statements are currently
6968 being added. If there is no active statement-tree, NULL is
6972 current_stmt_tree (void)
6974 return &c_stmt_tree;
6977 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6981 anon_aggr_type_p (tree ARG_UNUSED (node))
6986 /* Return the global value of T as a symbol. */
6989 identifier_global_value (tree t)
6991 struct c_binding *b;
6993 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6994 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
7000 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7001 otherwise the name is found in ridpointers from RID_INDEX. */
7004 record_builtin_type (enum rid rid_index, const char *name, tree type)
7008 id = ridpointers[(int) rid_index];
7010 id = get_identifier (name);
7011 decl = build_decl (TYPE_DECL, id, type);
7013 if (debug_hooks->type_decl)
7014 debug_hooks->type_decl (decl, false);
7017 /* Build the void_list_node (void_type_node having been created). */
7019 build_void_list_node (void)
7021 tree t = build_tree_list (NULL_TREE, void_type_node);
7025 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
7028 build_c_parm (struct c_declspecs *specs, tree attrs,
7029 struct c_declarator *declarator)
7031 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
7034 ret->declarator = declarator;
7038 /* Return a declarator with nested attributes. TARGET is the inner
7039 declarator to which these attributes apply. ATTRS are the
7042 struct c_declarator *
7043 build_attrs_declarator (tree attrs, struct c_declarator *target)
7045 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7046 ret->kind = cdk_attrs;
7047 ret->declarator = target;
7048 ret->u.attrs = attrs;
7052 /* Return a declarator for a function with arguments specified by ARGS
7053 and return type specified by TARGET. */
7055 struct c_declarator *
7056 build_function_declarator (struct c_arg_info *args,
7057 struct c_declarator *target)
7059 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7060 ret->kind = cdk_function;
7061 ret->declarator = target;
7062 ret->u.arg_info = args;
7066 /* Return a declarator for the identifier IDENT (which may be
7067 NULL_TREE for an abstract declarator). */
7069 struct c_declarator *
7070 build_id_declarator (tree ident)
7072 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7074 ret->declarator = 0;
7076 /* Default value - may get reset to a more precise location. */
7077 ret->id_loc = input_location;
7081 /* Return something to represent absolute declarators containing a *.
7082 TARGET is the absolute declarator that the * contains.
7083 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7084 to apply to the pointer type. */
7086 struct c_declarator *
7087 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
7088 struct c_declarator *target)
7092 struct c_declarator *itarget = target;
7093 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7094 if (type_quals_attrs)
7096 attrs = type_quals_attrs->attrs;
7097 quals = quals_from_declspecs (type_quals_attrs);
7098 if (attrs != NULL_TREE)
7099 itarget = build_attrs_declarator (attrs, target);
7101 ret->kind = cdk_pointer;
7102 ret->declarator = itarget;
7103 ret->u.pointer_quals = quals;
7107 /* Return a pointer to a structure for an empty list of declaration
7110 struct c_declspecs *
7111 build_null_declspecs (void)
7113 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
7117 ret->typespec_word = cts_none;
7118 ret->storage_class = csc_none;
7119 ret->declspecs_seen_p = false;
7120 ret->type_seen_p = false;
7121 ret->non_sc_seen_p = false;
7122 ret->typedef_p = false;
7123 ret->tag_defined_p = false;
7124 ret->explicit_signed_p = false;
7125 ret->deprecated_p = false;
7126 ret->default_int_p = false;
7127 ret->long_p = false;
7128 ret->long_long_p = false;
7129 ret->short_p = false;
7130 ret->signed_p = false;
7131 ret->unsigned_p = false;
7132 ret->complex_p = false;
7133 ret->inline_p = false;
7134 ret->thread_p = false;
7135 ret->const_p = false;
7136 ret->volatile_p = false;
7137 ret->restrict_p = false;
7141 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7144 struct c_declspecs *
7145 declspecs_add_qual (struct c_declspecs *specs, tree qual)
7149 specs->non_sc_seen_p = true;
7150 specs->declspecs_seen_p = true;
7151 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
7152 && C_IS_RESERVED_WORD (qual));
7153 i = C_RID_CODE (qual);
7157 dupe = specs->const_p;
7158 specs->const_p = true;
7161 dupe = specs->volatile_p;
7162 specs->volatile_p = true;
7165 dupe = specs->restrict_p;
7166 specs->restrict_p = true;
7171 if (dupe && pedantic && !flag_isoc99)
7172 pedwarn ("duplicate %qE", qual);
7176 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7179 struct c_declspecs *
7180 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7182 tree type = spec.spec;
7183 specs->non_sc_seen_p = true;
7184 specs->declspecs_seen_p = true;
7185 specs->type_seen_p = true;
7186 if (TREE_DEPRECATED (type))
7187 specs->deprecated_p = true;
7189 /* Handle type specifier keywords. */
7190 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
7192 enum rid i = C_RID_CODE (type);
7195 error ("two or more data types in declaration specifiers");
7198 if ((int) i <= (int) RID_LAST_MODIFIER)
7200 /* "long", "short", "signed", "unsigned" or "_Complex". */
7205 if (specs->long_long_p)
7207 error ("%<long long long%> is too long for GCC");
7212 if (specs->typespec_word == cts_double)
7214 error ("both %<long long%> and %<double%> in "
7215 "declaration specifiers");
7218 if (pedantic && !flag_isoc99 && !in_system_header
7220 pedwarn ("ISO C90 does not support %<long long%>");
7221 specs->long_long_p = 1;
7225 error ("both %<long%> and %<short%> in "
7226 "declaration specifiers");
7227 else if (specs->typespec_word == cts_void)
7228 error ("both %<long%> and %<void%> in "
7229 "declaration specifiers");
7230 else if (specs->typespec_word == cts_bool)
7231 error ("both %<long%> and %<_Bool%> in "
7232 "declaration specifiers");
7233 else if (specs->typespec_word == cts_char)
7234 error ("both %<long%> and %<char%> in "
7235 "declaration specifiers");
7236 else if (specs->typespec_word == cts_float)
7237 error ("both %<long%> and %<float%> in "
7238 "declaration specifiers");
7239 else if (specs->typespec_word == cts_dfloat32)
7240 error ("both %<long%> and %<_Decimal32%> in "
7241 "declaration specifiers");
7242 else if (specs->typespec_word == cts_dfloat64)
7243 error ("both %<long%> and %<_Decimal64%> in "
7244 "declaration specifiers");
7245 else if (specs->typespec_word == cts_dfloat128)
7246 error ("both %<long%> and %<_Decimal128%> in "
7247 "declaration specifiers");
7249 specs->long_p = true;
7252 dupe = specs->short_p;
7254 error ("both %<long%> and %<short%> in "
7255 "declaration specifiers");
7256 else if (specs->typespec_word == cts_void)
7257 error ("both %<short%> and %<void%> in "
7258 "declaration specifiers");
7259 else if (specs->typespec_word == cts_bool)
7260 error ("both %<short%> and %<_Bool%> in "
7261 "declaration specifiers");
7262 else if (specs->typespec_word == cts_char)
7263 error ("both %<short%> and %<char%> in "
7264 "declaration specifiers");
7265 else if (specs->typespec_word == cts_float)
7266 error ("both %<short%> and %<float%> in "
7267 "declaration specifiers");
7268 else if (specs->typespec_word == cts_double)
7269 error ("both %<short%> and %<double%> in "
7270 "declaration specifiers");
7271 else if (specs->typespec_word == cts_dfloat32)
7272 error ("both %<short%> and %<_Decimal32%> in "
7273 "declaration specifiers");
7274 else if (specs->typespec_word == cts_dfloat64)
7275 error ("both %<short%> and %<_Decimal64%> in "
7276 "declaration specifiers");
7277 else if (specs->typespec_word == cts_dfloat128)
7278 error ("both %<short%> and %<_Decimal128%> in "
7279 "declaration specifiers");
7281 specs->short_p = true;
7284 dupe = specs->signed_p;
7285 if (specs->unsigned_p)
7286 error ("both %<signed%> and %<unsigned%> in "
7287 "declaration specifiers");
7288 else if (specs->typespec_word == cts_void)
7289 error ("both %<signed%> and %<void%> in "
7290 "declaration specifiers");
7291 else if (specs->typespec_word == cts_bool)
7292 error ("both %<signed%> and %<_Bool%> in "
7293 "declaration specifiers");
7294 else if (specs->typespec_word == cts_float)
7295 error ("both %<signed%> and %<float%> in "
7296 "declaration specifiers");
7297 else if (specs->typespec_word == cts_double)
7298 error ("both %<signed%> and %<double%> in "
7299 "declaration specifiers");
7300 else if (specs->typespec_word == cts_dfloat32)
7301 error ("both %<signed%> and %<_Decimal32%> in "
7302 "declaration specifiers");
7303 else if (specs->typespec_word == cts_dfloat64)
7304 error ("both %<signed%> and %<_Decimal64%> in "
7305 "declaration specifiers");
7306 else if (specs->typespec_word == cts_dfloat128)
7307 error ("both %<signed%> and %<_Decimal128%> in "
7308 "declaration specifiers");
7310 specs->signed_p = true;
7313 dupe = specs->unsigned_p;
7314 if (specs->signed_p)
7315 error ("both %<signed%> and %<unsigned%> in "
7316 "declaration specifiers");
7317 else if (specs->typespec_word == cts_void)
7318 error ("both %<unsigned%> and %<void%> in "
7319 "declaration specifiers");
7320 else if (specs->typespec_word == cts_bool)
7321 error ("both %<unsigned%> and %<_Bool%> in "
7322 "declaration specifiers");
7323 else if (specs->typespec_word == cts_float)
7324 error ("both %<unsigned%> and %<float%> in "
7325 "declaration specifiers");
7326 else if (specs->typespec_word == cts_double)
7327 error ("both %<unsigned%> and %<double%> in "
7328 "declaration specifiers");
7329 else if (specs->typespec_word == cts_dfloat32)
7330 error ("both %<unsigned%> and %<_Decimal32%> in "
7331 "declaration specifiers");
7332 else if (specs->typespec_word == cts_dfloat64)
7333 error ("both %<unsigned%> and %<_Decimal64%> in "
7334 "declaration specifiers");
7335 else if (specs->typespec_word == cts_dfloat128)
7336 error ("both %<unsigned%> and %<_Decimal128%> in "
7337 "declaration specifiers");
7339 specs->unsigned_p = true;
7342 dupe = specs->complex_p;
7343 if (pedantic && !flag_isoc99 && !in_system_header)
7344 pedwarn ("ISO C90 does not support complex types");
7345 if (specs->typespec_word == cts_void)
7346 error ("both %<complex%> and %<void%> in "
7347 "declaration specifiers");
7348 else if (specs->typespec_word == cts_bool)
7349 error ("both %<complex%> and %<_Bool%> in "
7350 "declaration specifiers");
7351 else if (specs->typespec_word == cts_dfloat32)
7352 error ("both %<complex%> and %<_Decimal32%> in "
7353 "declaration specifiers");
7354 else if (specs->typespec_word == cts_dfloat64)
7355 error ("both %<complex%> and %<_Decimal64%> in "
7356 "declaration specifiers");
7357 else if (specs->typespec_word == cts_dfloat128)
7358 error ("both %<complex%> and %<_Decimal128%> in "
7359 "declaration specifiers");
7361 specs->complex_p = true;
7368 error ("duplicate %qE", type);
7374 /* "void", "_Bool", "char", "int", "float" or "double". */
7375 if (specs->typespec_word != cts_none)
7377 error ("two or more data types in declaration specifiers");
7384 error ("both %<long%> and %<void%> in "
7385 "declaration specifiers");
7386 else if (specs->short_p)
7387 error ("both %<short%> and %<void%> in "
7388 "declaration specifiers");
7389 else if (specs->signed_p)
7390 error ("both %<signed%> and %<void%> in "
7391 "declaration specifiers");
7392 else if (specs->unsigned_p)
7393 error ("both %<unsigned%> and %<void%> in "
7394 "declaration specifiers");
7395 else if (specs->complex_p)
7396 error ("both %<complex%> and %<void%> in "
7397 "declaration specifiers");
7399 specs->typespec_word = cts_void;
7403 error ("both %<long%> and %<_Bool%> in "
7404 "declaration specifiers");
7405 else if (specs->short_p)
7406 error ("both %<short%> and %<_Bool%> in "
7407 "declaration specifiers");
7408 else if (specs->signed_p)
7409 error ("both %<signed%> and %<_Bool%> in "
7410 "declaration specifiers");
7411 else if (specs->unsigned_p)
7412 error ("both %<unsigned%> and %<_Bool%> in "
7413 "declaration specifiers");
7414 else if (specs->complex_p)
7415 error ("both %<complex%> and %<_Bool%> in "
7416 "declaration specifiers");
7418 specs->typespec_word = cts_bool;
7422 error ("both %<long%> and %<char%> in "
7423 "declaration specifiers");
7424 else if (specs->short_p)
7425 error ("both %<short%> and %<char%> in "
7426 "declaration specifiers");
7428 specs->typespec_word = cts_char;
7431 specs->typespec_word = cts_int;
7435 error ("both %<long%> and %<float%> in "
7436 "declaration specifiers");
7437 else if (specs->short_p)
7438 error ("both %<short%> and %<float%> in "
7439 "declaration specifiers");
7440 else if (specs->signed_p)
7441 error ("both %<signed%> and %<float%> in "
7442 "declaration specifiers");
7443 else if (specs->unsigned_p)
7444 error ("both %<unsigned%> and %<float%> in "
7445 "declaration specifiers");
7447 specs->typespec_word = cts_float;
7450 if (specs->long_long_p)
7451 error ("both %<long long%> and %<double%> in "
7452 "declaration specifiers");
7453 else if (specs->short_p)
7454 error ("both %<short%> and %<double%> in "
7455 "declaration specifiers");
7456 else if (specs->signed_p)
7457 error ("both %<signed%> and %<double%> in "
7458 "declaration specifiers");
7459 else if (specs->unsigned_p)
7460 error ("both %<unsigned%> and %<double%> in "
7461 "declaration specifiers");
7463 specs->typespec_word = cts_double;
7470 if (i == RID_DFLOAT32)
7472 else if (i == RID_DFLOAT64)
7475 str = "_Decimal128";
7476 if (specs->long_long_p)
7477 error ("both %<long long%> and %<%s%> in "
7478 "declaration specifiers", str);
7480 error ("both %<long%> and %<%s%> in "
7481 "declaration specifiers", str);
7482 else if (specs->short_p)
7483 error ("both %<short%> and %<%s%> in "
7484 "declaration specifiers", str);
7485 else if (specs->signed_p)
7486 error ("both %<signed%> and %<%s%> in "
7487 "declaration specifiers", str);
7488 else if (specs->unsigned_p)
7489 error ("both %<unsigned%> and %<%s%> in "
7490 "declaration specifiers", str);
7491 else if (specs->complex_p)
7492 error ("both %<complex%> and %<%s%> in "
7493 "declaration specifiers", str);
7494 else if (i == RID_DFLOAT32)
7495 specs->typespec_word = cts_dfloat32;
7496 else if (i == RID_DFLOAT64)
7497 specs->typespec_word = cts_dfloat64;
7499 specs->typespec_word = cts_dfloat128;
7501 if (!targetm.decimal_float_supported_p ())
7502 error ("decimal floating point not supported for this target");
7504 pedwarn ("ISO C does not support decimal floating point");
7507 /* ObjC reserved word "id", handled below. */
7513 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7514 form of ObjC type, cases such as "int" and "long" being handled
7515 above), a TYPE (struct, union, enum and typeof specifiers) or an
7516 ERROR_MARK. In none of these cases may there have previously
7517 been any type specifiers. */
7518 if (specs->type || specs->typespec_word != cts_none
7519 || specs->long_p || specs->short_p || specs->signed_p
7520 || specs->unsigned_p || specs->complex_p)
7521 error ("two or more data types in declaration specifiers");
7522 else if (TREE_CODE (type) == TYPE_DECL)
7524 if (TREE_TYPE (type) == error_mark_node)
7525 ; /* Allow the type to default to int to avoid cascading errors. */
7528 specs->type = TREE_TYPE (type);
7529 specs->decl_attr = DECL_ATTRIBUTES (type);
7530 specs->typedef_p = true;
7531 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7534 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7536 tree t = lookup_name (type);
7537 if (!t || TREE_CODE (t) != TYPE_DECL)
7538 error ("%qE fails to be a typedef or built in type", type);
7539 else if (TREE_TYPE (t) == error_mark_node)
7542 specs->type = TREE_TYPE (t);
7544 else if (TREE_CODE (type) != ERROR_MARK)
7546 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7547 specs->tag_defined_p = true;
7548 if (spec.kind == ctsk_typeof)
7549 specs->typedef_p = true;
7556 /* Add the storage class specifier or function specifier SCSPEC to the
7557 declaration specifiers SPECS, returning SPECS. */
7559 struct c_declspecs *
7560 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7563 enum c_storage_class n = csc_none;
7565 specs->declspecs_seen_p = true;
7566 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7567 && C_IS_RESERVED_WORD (scspec));
7568 i = C_RID_CODE (scspec);
7569 if (specs->non_sc_seen_p)
7570 warning (OPT_Wold_style_declaration,
7571 "%qE is not at beginning of declaration", scspec);
7575 /* C99 permits duplicate inline. Although of doubtful utility,
7576 it seems simplest to permit it in gnu89 mode as well, as
7577 there is also little utility in maintaining this as a
7578 difference between gnu89 and C99 inline. */
7580 specs->inline_p = true;
7583 dupe = specs->thread_p;
7584 if (specs->storage_class == csc_auto)
7585 error ("%<__thread%> used with %<auto%>");
7586 else if (specs->storage_class == csc_register)
7587 error ("%<__thread%> used with %<register%>");
7588 else if (specs->storage_class == csc_typedef)
7589 error ("%<__thread%> used with %<typedef%>");
7591 specs->thread_p = true;
7598 /* Diagnose "__thread extern". */
7599 if (specs->thread_p)
7600 error ("%<__thread%> before %<extern%>");
7607 /* Diagnose "__thread static". */
7608 if (specs->thread_p)
7609 error ("%<__thread%> before %<static%>");
7617 if (n != csc_none && n == specs->storage_class)
7620 error ("duplicate %qE", scspec);
7623 if (specs->storage_class != csc_none && n != specs->storage_class)
7625 error ("multiple storage classes in declaration specifiers");
7629 specs->storage_class = n;
7630 if (n != csc_extern && n != csc_static && specs->thread_p)
7632 error ("%<__thread%> used with %qE", scspec);
7633 specs->thread_p = false;
7640 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7643 struct c_declspecs *
7644 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7646 specs->attrs = chainon (attrs, specs->attrs);
7647 specs->declspecs_seen_p = true;
7651 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7652 specifiers with any other type specifier to determine the resulting
7653 type. This is where ISO C checks on complex types are made, since
7654 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7657 struct c_declspecs *
7658 finish_declspecs (struct c_declspecs *specs)
7660 /* If a type was specified as a whole, we have no modifiers and are
7662 if (specs->type != NULL_TREE)
7664 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7665 && !specs->signed_p && !specs->unsigned_p
7666 && !specs->complex_p);
7670 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7671 has been specified, treat it as "int" unless "_Complex" is
7672 present and there are no other specifiers. If we just have
7673 "_Complex", it is equivalent to "_Complex double", but e.g.
7674 "_Complex short" is equivalent to "_Complex short int". */
7675 if (specs->typespec_word == cts_none)
7677 if (specs->long_p || specs->short_p
7678 || specs->signed_p || specs->unsigned_p)
7680 specs->typespec_word = cts_int;
7682 else if (specs->complex_p)
7684 specs->typespec_word = cts_double;
7686 pedwarn ("ISO C does not support plain %<complex%> meaning "
7687 "%<double complex%>");
7691 specs->typespec_word = cts_int;
7692 specs->default_int_p = true;
7693 /* We don't diagnose this here because grokdeclarator will
7694 give more specific diagnostics according to whether it is
7695 a function definition. */
7699 /* If "signed" was specified, record this to distinguish "int" and
7700 "signed int" in the case of a bit-field with
7701 -funsigned-bitfields. */
7702 specs->explicit_signed_p = specs->signed_p;
7704 /* Now compute the actual type. */
7705 switch (specs->typespec_word)
7708 gcc_assert (!specs->long_p && !specs->short_p
7709 && !specs->signed_p && !specs->unsigned_p
7710 && !specs->complex_p);
7711 specs->type = void_type_node;
7714 gcc_assert (!specs->long_p && !specs->short_p
7715 && !specs->signed_p && !specs->unsigned_p
7716 && !specs->complex_p);
7717 specs->type = boolean_type_node;
7720 gcc_assert (!specs->long_p && !specs->short_p);
7721 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7722 if (specs->signed_p)
7723 specs->type = signed_char_type_node;
7724 else if (specs->unsigned_p)
7725 specs->type = unsigned_char_type_node;
7727 specs->type = char_type_node;
7728 if (specs->complex_p)
7731 pedwarn ("ISO C does not support complex integer types");
7732 specs->type = build_complex_type (specs->type);
7736 gcc_assert (!(specs->long_p && specs->short_p));
7737 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7738 if (specs->long_long_p)
7739 specs->type = (specs->unsigned_p
7740 ? long_long_unsigned_type_node
7741 : long_long_integer_type_node);
7742 else if (specs->long_p)
7743 specs->type = (specs->unsigned_p
7744 ? long_unsigned_type_node
7745 : long_integer_type_node);
7746 else if (specs->short_p)
7747 specs->type = (specs->unsigned_p
7748 ? short_unsigned_type_node
7749 : short_integer_type_node);
7751 specs->type = (specs->unsigned_p
7752 ? unsigned_type_node
7753 : integer_type_node);
7754 if (specs->complex_p)
7757 pedwarn ("ISO C does not support complex integer types");
7758 specs->type = build_complex_type (specs->type);
7762 gcc_assert (!specs->long_p && !specs->short_p
7763 && !specs->signed_p && !specs->unsigned_p);
7764 specs->type = (specs->complex_p
7765 ? complex_float_type_node
7769 gcc_assert (!specs->long_long_p && !specs->short_p
7770 && !specs->signed_p && !specs->unsigned_p);
7773 specs->type = (specs->complex_p
7774 ? complex_long_double_type_node
7775 : long_double_type_node);
7779 specs->type = (specs->complex_p
7780 ? complex_double_type_node
7781 : double_type_node);
7787 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7788 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
7789 if (specs->typespec_word == cts_dfloat32)
7790 specs->type = dfloat32_type_node;
7791 else if (specs->typespec_word == cts_dfloat64)
7792 specs->type = dfloat64_type_node;
7794 specs->type = dfloat128_type_node;
7803 /* A subroutine of c_write_global_declarations. Perform final processing
7804 on one file scope's declarations (or the external scope's declarations),
7808 c_write_global_declarations_1 (tree globals)
7813 /* Process the decls in the order they were written. */
7814 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7816 /* Check for used but undefined static functions using the C
7817 standard's definition of "used", and set TREE_NO_WARNING so
7818 that check_global_declarations doesn't repeat the check. */
7819 if (TREE_CODE (decl) == FUNCTION_DECL
7820 && DECL_INITIAL (decl) == 0
7821 && DECL_EXTERNAL (decl)
7822 && !TREE_PUBLIC (decl)
7823 && C_DECL_USED (decl))
7825 pedwarn ("%q+F used but never defined", decl);
7826 TREE_NO_WARNING (decl) = 1;
7829 wrapup_global_declaration_1 (decl);
7835 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7836 reconsider |= wrapup_global_declaration_2 (decl);
7840 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7841 check_global_declaration_1 (decl);
7844 /* A subroutine of c_write_global_declarations Emit debug information for each
7845 of the declarations in GLOBALS. */
7848 c_write_global_declarations_2 (tree globals)
7852 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
7853 debug_hooks->global_decl (decl);
7856 /* Preserve the external declarations scope across a garbage collect. */
7857 static GTY(()) tree ext_block;
7860 c_write_global_declarations (void)
7864 /* We don't want to do this if generating a PCH. */
7868 /* Don't waste time on further processing if -fsyntax-only or we've
7869 encountered errors. */
7870 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7873 /* Close the external scope. */
7874 ext_block = pop_scope ();
7876 gcc_assert (!current_scope);
7880 tree tmp = BLOCK_VARS (ext_block);
7882 FILE * stream = dump_begin (TDI_tu, &flags);
7885 dump_node (tmp, flags & ~TDF_SLIM, stream);
7886 dump_end (TDI_tu, stream);
7890 /* Process all file scopes in this compilation, and the external_scope,
7891 through wrapup_global_declarations and check_global_declarations. */
7892 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7893 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7894 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7896 /* We're done parsing; proceed to optimize and emit assembly.
7897 FIXME: shouldn't be the front end's responsibility to call this. */
7900 /* After cgraph has had a chance to emit everything that's going to
7901 be emitted, output debug information for globals. */
7902 if (errorcount == 0 && sorrycount == 0)
7904 timevar_push (TV_SYMOUT);
7905 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7906 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
7907 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
7908 timevar_pop (TV_SYMOUT);
7914 #include "gt-c-decl.h"