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) */
74 /* Nonzero if we have seen an invalid cross reference
75 to a struct, union, or enum, but not yet printed the message. */
76 tree pending_invalid_xref;
78 /* File and line to appear in the eventual error message. */
79 location_t pending_invalid_xref_location;
81 /* True means we've initialized exception handling. */
82 bool c_eh_initialized_p;
84 /* The file and line that the prototype came from if this is an
85 old-style definition; used for diagnostics in
86 store_parm_decls_oldstyle. */
88 static location_t current_function_prototype_locus;
90 /* Whether this prototype was built-in. */
92 static bool current_function_prototype_built_in;
94 /* The argument type information of this prototype. */
96 static tree current_function_prototype_arg_types;
98 /* The argument information structure for the function currently being
101 static struct c_arg_info *current_function_arg_info;
103 /* The obstack on which parser and related data structures, which are
104 not live beyond their top-level declaration or definition, are
106 struct obstack parser_obstack;
108 /* The current statement tree. */
110 static GTY(()) struct stmt_tree_s c_stmt_tree;
112 /* State saving variables. */
116 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
117 included in this invocation. Note that the current translation
118 unit is not included in this list. */
120 static GTY(()) tree all_translation_units;
122 /* A list of decls to be made automatically visible in each file scope. */
123 static GTY(()) tree visible_builtins;
125 /* Set to 0 at beginning of a function definition, set to 1 if
126 a return statement that specifies a return value is seen. */
128 int current_function_returns_value;
130 /* Set to 0 at beginning of a function definition, set to 1 if
131 a return statement with no argument is seen. */
133 int current_function_returns_null;
135 /* Set to 0 at beginning of a function definition, set to 1 if
136 a call to a noreturn function is seen. */
138 int current_function_returns_abnormally;
140 /* Set to nonzero by `grokdeclarator' for a function
141 whose return type is defaulted, if warnings for this are desired. */
143 static int warn_about_return_type;
145 /* Nonzero when the current toplevel function contains a declaration
146 of a nested function which is never defined. */
148 static bool undef_nested_function;
150 /* True means global_bindings_p should return false even if the scope stack
151 says we are in file scope. */
152 bool c_override_global_bindings_to_false;
155 /* Each c_binding structure describes one binding of an identifier to
156 a decl. All the decls in a scope - irrespective of namespace - are
157 chained together by the ->prev field, which (as the name implies)
158 runs in reverse order. All the decls in a given namespace bound to
159 a given identifier are chained by the ->shadowed field, which runs
160 from inner to outer scopes.
162 The ->decl field usually points to a DECL node, but there are two
163 exceptions. In the namespace of type tags, the bound entity is a
164 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
165 identifier is encountered, it is bound to error_mark_node to
166 suppress further errors about that identifier in the current
169 The ->type field stores the type of the declaration in this scope;
170 if NULL, the type is the type of the ->decl field. This is only of
171 relevance for objects with external or internal linkage which may
172 be redeclared in inner scopes, forming composite types that only
173 persist for the duration of those scopes. In the external scope,
174 this stores the composite of all the types declared for this
175 object, visible or not. The ->inner_comp field (used only at file
176 scope) stores whether an incomplete array type at file scope was
177 completed at an inner scope to an array size other than 1.
179 The depth field is copied from the scope structure that holds this
180 decl. It is used to preserve the proper ordering of the ->shadowed
181 field (see bind()) and also for a handful of special-case checks.
182 Finally, the invisible bit is true for a decl which should be
183 ignored for purposes of normal name lookup, and the nested bit is
184 true for a decl that's been bound a second time in an inner scope;
185 in all such cases, the binding in the outer scope will have its
186 invisible bit true. */
188 struct c_binding GTY((chain_next ("%h.prev")))
190 tree decl; /* the decl bound */
191 tree type; /* the type in this scope */
192 tree id; /* the identifier it's bound to */
193 struct c_binding *prev; /* the previous decl in this scope */
194 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
195 unsigned int depth : 28; /* depth of this scope */
196 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
197 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
198 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
201 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
202 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
203 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
204 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
206 #define I_SYMBOL_BINDING(node) \
207 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
208 #define I_SYMBOL_DECL(node) \
209 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
211 #define I_TAG_BINDING(node) \
212 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
213 #define I_TAG_DECL(node) \
214 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
216 #define I_LABEL_BINDING(node) \
217 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
218 #define I_LABEL_DECL(node) \
219 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
221 /* Each C symbol points to three linked lists of c_binding structures.
222 These describe the values of the identifier in the three different
223 namespaces defined by the language. */
225 struct lang_identifier GTY(())
227 struct c_common_identifier common_id;
228 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
229 struct c_binding *tag_binding; /* struct/union/enum tags */
230 struct c_binding *label_binding; /* labels */
233 /* Validate c-lang.c's assumptions. */
234 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
235 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
237 /* The resulting tree type. */
240 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
241 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))")))
243 union tree_node GTY ((tag ("0"),
244 desc ("tree_node_structure (&%h)")))
246 struct lang_identifier GTY ((tag ("1"))) identifier;
249 /* Each c_scope structure describes the complete contents of one
250 scope. Four scopes are distinguished specially: the innermost or
251 current scope, the innermost function scope, the file scope (always
252 the second to outermost) and the outermost or external scope.
254 Most declarations are recorded in the current scope.
256 All normal label declarations are recorded in the innermost
257 function scope, as are bindings of undeclared identifiers to
258 error_mark_node. (GCC permits nested functions as an extension,
259 hence the 'innermost' qualifier.) Explicitly declared labels
260 (using the __label__ extension) appear in the current scope.
262 Being in the file scope (current_scope == file_scope) causes
263 special behavior in several places below. Also, under some
264 conditions the Objective-C front end records declarations in the
265 file scope even though that isn't the current scope.
267 All declarations with external linkage are recorded in the external
268 scope, even if they aren't visible there; this models the fact that
269 such declarations are visible to the entire program, and (with a
270 bit of cleverness, see pushdecl) allows diagnosis of some violations
271 of C99 6.2.2p7 and 6.2.7p2:
273 If, within the same translation unit, the same identifier appears
274 with both internal and external linkage, the behavior is
277 All declarations that refer to the same object or function shall
278 have compatible type; otherwise, the behavior is undefined.
280 Initially only the built-in declarations, which describe compiler
281 intrinsic functions plus a subset of the standard library, are in
284 The order of the blocks list matters, and it is frequently appended
285 to. To avoid having to walk all the way to the end of the list on
286 each insertion, or reverse the list later, we maintain a pointer to
287 the last list entry. (FIXME: It should be feasible to use a reversed
290 The bindings list is strictly in reverse order of declarations;
291 pop_scope relies on this. */
294 struct c_scope GTY((chain_next ("%h.outer")))
296 /* The scope containing this one. */
297 struct c_scope *outer;
299 /* The next outermost function scope. */
300 struct c_scope *outer_function;
302 /* All bindings in this scope. */
303 struct c_binding *bindings;
305 /* For each scope (except the global one), a chain of BLOCK nodes
306 for all the scopes that were entered and exited one level down. */
310 /* The depth of this scope. Used to keep the ->shadowed chain of
311 bindings sorted innermost to outermost. */
312 unsigned int depth : 28;
314 /* True if we are currently filling this scope with parameter
316 BOOL_BITFIELD parm_flag : 1;
318 /* True if we saw [*] in this scope. Used to give an error messages
319 if these appears in a function definition. */
320 BOOL_BITFIELD had_vla_unspec : 1;
322 /* True if we already complained about forward parameter decls
323 in this scope. This prevents double warnings on
324 foo (int a; int b; ...) */
325 BOOL_BITFIELD warned_forward_parm_decls : 1;
327 /* True if this is the outermost block scope of a function body.
328 This scope contains the parameters, the local variables declared
329 in the outermost block, and all the labels (except those in
330 nested functions, or declared at block scope with __label__). */
331 BOOL_BITFIELD function_body : 1;
333 /* True means make a BLOCK for this scope no matter what. */
334 BOOL_BITFIELD keep : 1;
337 /* The scope currently in effect. */
339 static GTY(()) struct c_scope *current_scope;
341 /* The innermost function scope. Ordinary (not explicitly declared)
342 labels, bindings to error_mark_node, and the lazily-created
343 bindings of __func__ and its friends get this scope. */
345 static GTY(()) struct c_scope *current_function_scope;
347 /* The C file scope. This is reset for each input translation unit. */
349 static GTY(()) struct c_scope *file_scope;
351 /* The outermost scope. This is used for all declarations with
352 external linkage, and only these, hence the name. */
354 static GTY(()) struct c_scope *external_scope;
356 /* A chain of c_scope structures awaiting reuse. */
358 static GTY((deletable)) struct c_scope *scope_freelist;
360 /* A chain of c_binding structures awaiting reuse. */
362 static GTY((deletable)) struct c_binding *binding_freelist;
364 /* Append VAR to LIST in scope SCOPE. */
365 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
366 struct c_scope *s_ = (scope); \
368 if (s_->list##_last) \
369 TREE_CHAIN (s_->list##_last) = d_; \
372 s_->list##_last = d_; \
375 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
376 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
377 struct c_scope *t_ = (tscope); \
378 struct c_scope *f_ = (fscope); \
380 TREE_CHAIN (t_->to##_last) = f_->from; \
383 t_->to##_last = f_->from##_last; \
386 /* True means unconditionally make a BLOCK for the next scope pushed. */
388 static bool keep_next_level_flag;
390 /* True means the next call to push_scope will be the outermost scope
391 of a function body, so do not push a new scope, merely cease
392 expecting parameter decls. */
394 static bool next_is_function_body;
396 /* Forward declarations. */
397 static tree lookup_name_in_scope (tree, struct c_scope *);
398 static tree c_make_fname_decl (tree, int);
399 static tree grokdeclarator (const struct c_declarator *,
400 struct c_declspecs *,
401 enum decl_context, bool, tree *);
402 static tree grokparms (struct c_arg_info *, bool);
403 static void layout_array_type (tree);
405 /* T is a statement. Add it to the statement-tree. This is the
406 C/ObjC version--C++ has a slightly different version of this
412 enum tree_code code = TREE_CODE (t);
414 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
416 if (!EXPR_HAS_LOCATION (t))
417 SET_EXPR_LOCATION (t, input_location);
420 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
421 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
423 /* Add T to the statement-tree. Non-side-effect statements need to be
424 recorded during statement expressions. */
425 append_to_statement_list_force (t, &cur_stmt_list);
430 /* States indicating how grokdeclarator() should handle declspecs marked
431 with __attribute__((deprecated)). An object declared as
432 __attribute__((deprecated)) suppresses warnings of uses of other
435 enum deprecated_states {
440 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
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 (TREE_CODE (olddecl) != FUNCTION_DECL)
1668 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1670 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1671 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1676 /* Merge the type qualifiers. */
1677 if (TREE_READONLY (newdecl))
1678 TREE_READONLY (olddecl) = 1;
1680 if (TREE_THIS_VOLATILE (newdecl))
1681 TREE_THIS_VOLATILE (olddecl) = 1;
1683 /* Merge deprecatedness. */
1684 if (TREE_DEPRECATED (newdecl))
1685 TREE_DEPRECATED (olddecl) = 1;
1687 /* Keep source location of definition rather than declaration and of
1688 prototype rather than non-prototype unless that prototype is
1690 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1691 || (old_is_prototype && !new_is_prototype
1692 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1693 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1695 /* Merge the initialization information. */
1696 if (DECL_INITIAL (newdecl) == 0)
1697 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1699 /* Merge the threadprivate attribute. */
1700 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
1702 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1703 C_DECL_THREADPRIVATE_P (newdecl) = 1;
1706 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1708 /* Merge the unused-warning information. */
1709 if (DECL_IN_SYSTEM_HEADER (olddecl))
1710 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1711 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1712 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1714 /* Merge the section attribute.
1715 We want to issue an error if the sections conflict but that
1716 must be done later in decl_attributes since we are called
1717 before attributes are assigned. */
1718 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1719 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1721 /* Copy the assembler name.
1722 Currently, it can only be defined in the prototype. */
1723 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1725 /* Use visibility of whichever declaration had it specified */
1726 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1728 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1729 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1732 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1734 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1735 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1736 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1737 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1738 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1739 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1740 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1741 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1742 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1743 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1746 /* Merge the storage class information. */
1747 merge_weak (newdecl, olddecl);
1749 /* For functions, static overrides non-static. */
1750 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1752 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1753 /* This is since we don't automatically
1754 copy the attributes of NEWDECL into OLDDECL. */
1755 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1756 /* If this clears `static', clear it in the identifier too. */
1757 if (!TREE_PUBLIC (olddecl))
1758 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1762 /* In c99, 'extern' declaration before (or after) 'inline' means this
1763 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1765 if (TREE_CODE (newdecl) == FUNCTION_DECL
1766 && !flag_gnu89_inline
1767 && (DECL_DECLARED_INLINE_P (newdecl)
1768 || DECL_DECLARED_INLINE_P (olddecl))
1769 && (!DECL_DECLARED_INLINE_P (newdecl)
1770 || !DECL_DECLARED_INLINE_P (olddecl)
1771 || !DECL_EXTERNAL (olddecl))
1772 && DECL_EXTERNAL (newdecl)
1773 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl)))
1774 DECL_EXTERNAL (newdecl) = 0;
1776 if (DECL_EXTERNAL (newdecl))
1778 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1779 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1781 /* An extern decl does not override previous storage class. */
1782 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1783 if (!DECL_EXTERNAL (newdecl))
1785 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1786 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1791 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1792 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1795 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1797 /* If we're redefining a function previously defined as extern
1798 inline, make sure we emit debug info for the inline before we
1799 throw it away, in case it was inlined into a function that
1800 hasn't been written out yet. */
1801 if (new_is_definition && DECL_INITIAL (olddecl))
1803 if (TREE_USED (olddecl)
1804 /* In unit-at-a-time mode we never inline re-defined extern
1805 inline functions. */
1806 && !flag_unit_at_a_time
1807 && cgraph_function_possibly_inlined_p (olddecl))
1808 (*debug_hooks->outlining_inline_function) (olddecl);
1810 /* The new defn must not be inline. */
1811 DECL_INLINE (newdecl) = 0;
1812 DECL_UNINLINABLE (newdecl) = 1;
1816 /* If either decl says `inline', this fn is inline, unless
1817 its definition was passed already. */
1818 if (DECL_DECLARED_INLINE_P (newdecl)
1819 || DECL_DECLARED_INLINE_P (olddecl))
1820 DECL_DECLARED_INLINE_P (newdecl) = 1;
1822 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1823 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1826 if (DECL_BUILT_IN (olddecl))
1828 /* If redeclaring a builtin function, it stays built in.
1829 But it gets tagged as having been declared. */
1830 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1831 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1832 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1833 if (new_is_prototype)
1834 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1836 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1837 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1840 /* Also preserve various other info from the definition. */
1841 if (!new_is_definition)
1843 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1844 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1845 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1846 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1847 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1849 /* Set DECL_INLINE on the declaration if we've got a body
1850 from which to instantiate. */
1851 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1853 DECL_INLINE (newdecl) = 1;
1854 DECL_ABSTRACT_ORIGIN (newdecl)
1855 = DECL_ABSTRACT_ORIGIN (olddecl);
1860 /* If a previous declaration said inline, mark the
1861 definition as inlinable. */
1862 if (DECL_DECLARED_INLINE_P (newdecl)
1863 && !DECL_UNINLINABLE (newdecl))
1864 DECL_INLINE (newdecl) = 1;
1868 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
1870 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1871 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1873 unsigned olddecl_uid = DECL_UID (olddecl);
1874 tree olddecl_context = DECL_CONTEXT (olddecl);
1876 memcpy ((char *) olddecl + sizeof (struct tree_common),
1877 (char *) newdecl + sizeof (struct tree_common),
1878 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1879 switch (TREE_CODE (olddecl))
1889 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1890 (char *) newdecl + sizeof (struct tree_decl_common),
1891 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1896 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1897 (char *) newdecl + sizeof (struct tree_decl_common),
1898 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1900 DECL_UID (olddecl) = olddecl_uid;
1901 DECL_CONTEXT (olddecl) = olddecl_context;
1904 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1905 so that encode_section_info has a chance to look at the new decl
1906 flags and attributes. */
1907 if (DECL_RTL_SET_P (olddecl)
1908 && (TREE_CODE (olddecl) == FUNCTION_DECL
1909 || (TREE_CODE (olddecl) == VAR_DECL
1910 && TREE_STATIC (olddecl))))
1911 make_decl_rtl (olddecl);
1913 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1914 and the definition is coming from the old version, cgraph needs
1915 to be called again. */
1916 if (extern_changed && !new_is_definition
1917 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
1918 cgraph_finalize_function (olddecl, false);
1921 /* Handle when a new declaration NEWDECL has the same name as an old
1922 one OLDDECL in the same binding contour. Prints an error message
1925 If safely possible, alter OLDDECL to look like NEWDECL, and return
1926 true. Otherwise, return false. */
1929 duplicate_decls (tree newdecl, tree olddecl)
1931 tree newtype = NULL, oldtype = NULL;
1933 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1935 /* Avoid `unused variable' and other warnings warnings for OLDDECL. */
1936 TREE_NO_WARNING (olddecl) = 1;
1940 merge_decls (newdecl, olddecl, newtype, oldtype);
1945 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1947 warn_if_shadowing (tree new_decl)
1949 struct c_binding *b;
1951 /* Shadow warnings wanted? */
1953 /* No shadow warnings for internally generated vars. */
1954 || DECL_IS_BUILTIN (new_decl)
1955 /* No shadow warnings for vars made for inlining. */
1956 || DECL_FROM_INLINE (new_decl))
1959 /* Is anything being shadowed? Invisible decls do not count. */
1960 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1961 if (b->decl && b->decl != new_decl && !b->invisible)
1963 tree old_decl = b->decl;
1965 if (old_decl == error_mark_node)
1967 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1968 "non-variable", new_decl);
1971 else if (TREE_CODE (old_decl) == PARM_DECL)
1972 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
1974 else if (DECL_FILE_SCOPE_P (old_decl))
1975 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
1976 "declaration", new_decl);
1977 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1978 && DECL_BUILT_IN (old_decl))
1980 warning (OPT_Wshadow, "declaration of %q+D shadows "
1981 "a built-in function", new_decl);
1985 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
1988 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
1995 /* Subroutine of pushdecl.
1997 X is a TYPE_DECL for a typedef statement. Create a brand new
1998 ..._TYPE node (which will be just a variant of the existing
1999 ..._TYPE node with identical properties) and then install X
2000 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2002 The whole point here is to end up with a situation where each
2003 and every ..._TYPE node the compiler creates will be uniquely
2004 associated with AT MOST one node representing a typedef name.
2005 This way, even though the compiler substitutes corresponding
2006 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2007 early on, later parts of the compiler can always do the reverse
2008 translation and get back the corresponding typedef name. For
2011 typedef struct S MY_TYPE;
2014 Later parts of the compiler might only know that `object' was of
2015 type `struct S' if it were not for code just below. With this
2016 code however, later parts of the compiler see something like:
2018 struct S' == struct S
2019 typedef struct S' MY_TYPE;
2022 And they can then deduce (from the node for type struct S') that
2023 the original object declaration was:
2027 Being able to do this is important for proper support of protoize,
2028 and also for generating precise symbolic debugging information
2029 which takes full account of the programmer's (typedef) vocabulary.
2031 Obviously, we don't want to generate a duplicate ..._TYPE node if
2032 the TYPE_DECL node that we are now processing really represents a
2033 standard built-in type.
2035 Since all standard types are effectively declared at line zero
2036 in the source file, we can easily check to see if we are working
2037 on a standard type by checking the current value of lineno. */
2040 clone_underlying_type (tree x)
2042 if (DECL_IS_BUILTIN (x))
2044 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2045 TYPE_NAME (TREE_TYPE (x)) = x;
2047 else if (TREE_TYPE (x) != error_mark_node
2048 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2050 tree tt = TREE_TYPE (x);
2051 DECL_ORIGINAL_TYPE (x) = tt;
2052 tt = build_variant_type_copy (tt);
2054 TREE_USED (tt) = TREE_USED (x);
2059 /* Record a decl-node X as belonging to the current lexical scope.
2060 Check for errors (such as an incompatible declaration for the same
2061 name already seen in the same scope).
2063 Returns either X or an old decl for the same name.
2064 If an old decl is returned, it may have been smashed
2065 to agree with what X says. */
2070 tree name = DECL_NAME (x);
2071 struct c_scope *scope = current_scope;
2072 struct c_binding *b;
2073 bool nested = false;
2075 /* Functions need the lang_decl data. */
2076 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
2077 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
2079 /* Must set DECL_CONTEXT for everything not at file scope or
2080 DECL_FILE_SCOPE_P won't work. Local externs don't count
2081 unless they have initializers (which generate code). */
2082 if (current_function_decl
2083 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2084 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2085 DECL_CONTEXT (x) = current_function_decl;
2087 /* If this is of variably modified type, prevent jumping into its
2089 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2090 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2091 c_begin_vm_scope (scope->depth);
2093 /* Anonymous decls are just inserted in the scope. */
2096 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
2100 /* First, see if there is another declaration with the same name in
2101 the current scope. If there is, duplicate_decls may do all the
2102 work for us. If duplicate_decls returns false, that indicates
2103 two incompatible decls in the same scope; we are to silently
2104 replace the old one (duplicate_decls has issued all appropriate
2105 diagnostics). In particular, we should not consider possible
2106 duplicates in the external scope, or shadowing. */
2107 b = I_SYMBOL_BINDING (name);
2108 if (b && B_IN_SCOPE (b, scope))
2110 struct c_binding *b_ext, *b_use;
2111 tree type = TREE_TYPE (x);
2112 tree visdecl = b->decl;
2113 tree vistype = TREE_TYPE (visdecl);
2114 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2115 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2116 b->inner_comp = false;
2119 /* If this is an external linkage declaration, we should check
2120 for compatibility with the type in the external scope before
2121 setting the type at this scope based on the visible
2122 information only. */
2123 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2125 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2126 b_ext = b_ext->shadowed;
2131 TREE_TYPE (b_use->decl) = b_use->type;
2134 if (duplicate_decls (x, b_use->decl))
2138 /* Save the updated type in the external scope and
2139 restore the proper type for this scope. */
2141 if (comptypes (vistype, type))
2142 thistype = composite_type (vistype, type);
2144 thistype = TREE_TYPE (b_use->decl);
2145 b_use->type = TREE_TYPE (b_use->decl);
2146 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2147 && DECL_BUILT_IN (b_use->decl))
2149 = build_type_attribute_variant (thistype,
2152 TREE_TYPE (b_use->decl) = thistype;
2157 goto skip_external_and_shadow_checks;
2160 /* All declarations with external linkage, and all external
2161 references, go in the external scope, no matter what scope is
2162 current. However, the binding in that scope is ignored for
2163 purposes of normal name lookup. A separate binding structure is
2164 created in the requested scope; this governs the normal
2165 visibility of the symbol.
2167 The binding in the externals scope is used exclusively for
2168 detecting duplicate declarations of the same object, no matter
2169 what scope they are in; this is what we do here. (C99 6.2.7p2:
2170 All declarations that refer to the same object or function shall
2171 have compatible type; otherwise, the behavior is undefined.) */
2172 if (DECL_EXTERNAL (x) || scope == file_scope)
2174 tree type = TREE_TYPE (x);
2177 bool type_saved = false;
2178 if (b && !B_IN_EXTERNAL_SCOPE (b)
2179 && (TREE_CODE (b->decl) == FUNCTION_DECL
2180 || TREE_CODE (b->decl) == VAR_DECL)
2181 && DECL_FILE_SCOPE_P (b->decl))
2184 vistype = TREE_TYPE (visdecl);
2186 if (scope != file_scope
2187 && !DECL_IN_SYSTEM_HEADER (x))
2188 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2190 while (b && !B_IN_EXTERNAL_SCOPE (b))
2192 /* If this decl might be modified, save its type. This is
2193 done here rather than when the decl is first bound
2194 because the type may change after first binding, through
2195 being completed or through attributes being added. If we
2196 encounter multiple such decls, only the first should have
2197 its type saved; the others will already have had their
2198 proper types saved and the types will not have changed as
2199 their scopes will not have been re-entered. */
2200 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2202 b->type = TREE_TYPE (b->decl);
2205 if (B_IN_FILE_SCOPE (b)
2206 && TREE_CODE (b->decl) == VAR_DECL
2207 && TREE_STATIC (b->decl)
2208 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2209 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2210 && TREE_CODE (type) == ARRAY_TYPE
2211 && TYPE_DOMAIN (type)
2212 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2213 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2215 /* Array type completed in inner scope, which should be
2216 diagnosed if the completion does not have size 1 and
2217 it does not get completed in the file scope. */
2218 b->inner_comp = true;
2223 /* If a matching external declaration has been found, set its
2224 type to the composite of all the types of that declaration.
2225 After the consistency checks, it will be reset to the
2226 composite of the visible types only. */
2227 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2229 TREE_TYPE (b->decl) = b->type;
2231 /* The point of the same_translation_unit_p check here is,
2232 we want to detect a duplicate decl for a construct like
2233 foo() { extern bar(); } ... static bar(); but not if
2234 they are in different translation units. In any case,
2235 the static does not go in the externals scope. */
2237 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2238 && duplicate_decls (x, b->decl))
2243 if (comptypes (vistype, type))
2244 thistype = composite_type (vistype, type);
2246 thistype = TREE_TYPE (b->decl);
2250 b->type = TREE_TYPE (b->decl);
2251 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2253 = build_type_attribute_variant (thistype,
2254 TYPE_ATTRIBUTES (b->type));
2255 TREE_TYPE (b->decl) = thistype;
2256 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2259 else if (TREE_PUBLIC (x))
2261 if (visdecl && !b && duplicate_decls (x, visdecl))
2263 /* An external declaration at block scope referring to a
2264 visible entity with internal linkage. The composite
2265 type will already be correct for this scope, so we
2266 just need to fall through to make the declaration in
2273 bind (name, x, external_scope, /*invisible=*/true,
2280 if (TREE_CODE (x) != PARM_DECL)
2281 warn_if_shadowing (x);
2283 skip_external_and_shadow_checks:
2284 if (TREE_CODE (x) == TYPE_DECL)
2285 clone_underlying_type (x);
2287 bind (name, x, scope, /*invisible=*/false, nested);
2289 /* If x's type is incomplete because it's based on a
2290 structure or union which has not yet been fully declared,
2291 attach it to that structure or union type, so we can go
2292 back and complete the variable declaration later, if the
2293 structure or union gets fully declared.
2295 If the input is erroneous, we can have error_mark in the type
2296 slot (e.g. "f(void a, ...)") - that doesn't count as an
2298 if (TREE_TYPE (x) != error_mark_node
2299 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2301 tree element = TREE_TYPE (x);
2303 while (TREE_CODE (element) == ARRAY_TYPE)
2304 element = TREE_TYPE (element);
2305 element = TYPE_MAIN_VARIANT (element);
2307 if ((TREE_CODE (element) == RECORD_TYPE
2308 || TREE_CODE (element) == UNION_TYPE)
2309 && (TREE_CODE (x) != TYPE_DECL
2310 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2311 && !COMPLETE_TYPE_P (element))
2312 C_TYPE_INCOMPLETE_VARS (element)
2313 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2318 /* Record X as belonging to file scope.
2319 This is used only internally by the Objective-C front end,
2320 and is limited to its needs. duplicate_decls is not called;
2321 if there is any preexisting decl for this identifier, it is an ICE. */
2324 pushdecl_top_level (tree x)
2327 bool nested = false;
2328 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2330 name = DECL_NAME (x);
2332 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2334 if (TREE_PUBLIC (x))
2336 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2340 bind (name, x, file_scope, /*invisible=*/false, nested);
2346 implicit_decl_warning (tree id, tree olddecl)
2348 if (warn_implicit_function_declaration)
2351 pedwarn (G_("implicit declaration of function %qE"), id);
2353 warning (OPT_Wimplicit_function_declaration,
2354 G_("implicit declaration of function %qE"), id);
2356 locate_old_decl (olddecl, inform);
2360 /* Generate an implicit declaration for identifier FUNCTIONID as a
2361 function of type int (). */
2364 implicitly_declare (tree functionid)
2366 struct c_binding *b;
2370 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2372 if (B_IN_SCOPE (b, external_scope))
2381 if (decl == error_mark_node)
2384 /* FIXME: Objective-C has weird not-really-builtin functions
2385 which are supposed to be visible automatically. They wind up
2386 in the external scope because they're pushed before the file
2387 scope gets created. Catch this here and rebind them into the
2389 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2391 bind (functionid, decl, file_scope,
2392 /*invisible=*/false, /*nested=*/true);
2397 tree newtype = default_function_type;
2399 TREE_TYPE (decl) = b->type;
2400 /* Implicit declaration of a function already declared
2401 (somehow) in a different scope, or as a built-in.
2402 If this is the first time this has happened, warn;
2403 then recycle the old declaration but with the new type. */
2404 if (!C_DECL_IMPLICIT (decl))
2406 implicit_decl_warning (functionid, decl);
2407 C_DECL_IMPLICIT (decl) = 1;
2409 if (DECL_BUILT_IN (decl))
2411 newtype = build_type_attribute_variant (newtype,
2413 (TREE_TYPE (decl)));
2414 if (!comptypes (newtype, TREE_TYPE (decl)))
2416 warning (0, "incompatible implicit declaration of built-in"
2417 " function %qD", decl);
2418 newtype = TREE_TYPE (decl);
2423 if (!comptypes (newtype, TREE_TYPE (decl)))
2425 error ("incompatible implicit declaration of function %qD",
2427 locate_old_decl (decl, error);
2430 b->type = TREE_TYPE (decl);
2431 TREE_TYPE (decl) = newtype;
2432 bind (functionid, decl, current_scope,
2433 /*invisible=*/false, /*nested=*/true);
2438 /* Not seen before. */
2439 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2440 DECL_EXTERNAL (decl) = 1;
2441 TREE_PUBLIC (decl) = 1;
2442 C_DECL_IMPLICIT (decl) = 1;
2443 implicit_decl_warning (functionid, 0);
2444 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2446 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2448 /* C89 says implicit declarations are in the innermost block.
2449 So we record the decl in the standard fashion. */
2450 decl = pushdecl (decl);
2452 /* No need to call objc_check_decl here - it's a function type. */
2453 rest_of_decl_compilation (decl, 0, 0);
2455 /* Write a record describing this implicit function declaration
2456 to the prototypes file (if requested). */
2457 gen_aux_info_record (decl, 0, 1, 0);
2459 /* Possibly apply some default attributes to this implicit declaration. */
2460 decl_attributes (&decl, NULL_TREE, 0);
2465 /* Issue an error message for a reference to an undeclared variable
2466 ID, including a reference to a builtin outside of function-call
2467 context. Establish a binding of the identifier to error_mark_node
2468 in an appropriate scope, which will suppress further errors for the
2469 same identifier. The error message should be given location LOC. */
2471 undeclared_variable (tree id, location_t loc)
2473 static bool already = false;
2474 struct c_scope *scope;
2476 if (current_function_decl == 0)
2478 error ("%H%qE undeclared here (not in a function)", &loc, id);
2479 scope = current_scope;
2483 error ("%H%qE undeclared (first use in this function)", &loc, id);
2487 error ("%H(Each undeclared identifier is reported only once", &loc);
2488 error ("%Hfor each function it appears in.)", &loc);
2492 /* If we are parsing old-style parameter decls, current_function_decl
2493 will be nonnull but current_function_scope will be null. */
2494 scope = current_function_scope ? current_function_scope : current_scope;
2496 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2499 /* Subroutine of lookup_label, declare_label, define_label: construct a
2500 LABEL_DECL with all the proper frills. */
2503 make_label (tree name, location_t location)
2505 tree label = build_decl (LABEL_DECL, name, void_type_node);
2507 DECL_CONTEXT (label) = current_function_decl;
2508 DECL_MODE (label) = VOIDmode;
2509 DECL_SOURCE_LOCATION (label) = location;
2514 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2515 Create one if none exists so far for the current function.
2516 This is called when a label is used in a goto expression or
2517 has its address taken. */
2520 lookup_label (tree name)
2524 if (current_function_decl == 0)
2526 error ("label %qE referenced outside of any function", name);
2530 /* Use a label already defined or ref'd with this name, but not if
2531 it is inherited from a containing function and wasn't declared
2533 label = I_LABEL_DECL (name);
2534 if (label && (DECL_CONTEXT (label) == current_function_decl
2535 || C_DECLARED_LABEL_FLAG (label)))
2537 /* If the label has only been declared, update its apparent
2538 location to point here, for better diagnostics if it
2539 turns out not to have been defined. */
2540 if (!TREE_USED (label))
2541 DECL_SOURCE_LOCATION (label) = input_location;
2545 /* No label binding for that identifier; make one. */
2546 label = make_label (name, input_location);
2548 /* Ordinary labels go in the current function scope. */
2549 bind (name, label, current_function_scope,
2550 /*invisible=*/false, /*nested=*/false);
2554 /* Make a label named NAME in the current function, shadowing silently
2555 any that may be inherited from containing functions or containing
2556 scopes. This is called for __label__ declarations. */
2559 declare_label (tree name)
2561 struct c_binding *b = I_LABEL_BINDING (name);
2564 /* Check to make sure that the label hasn't already been declared
2566 if (b && B_IN_CURRENT_SCOPE (b))
2568 error ("duplicate label declaration %qE", name);
2569 locate_old_decl (b->decl, error);
2571 /* Just use the previous declaration. */
2575 label = make_label (name, input_location);
2576 C_DECLARED_LABEL_FLAG (label) = 1;
2578 /* Declared labels go in the current scope. */
2579 bind (name, label, current_scope,
2580 /*invisible=*/false, /*nested=*/false);
2584 /* Define a label, specifying the location in the source file.
2585 Return the LABEL_DECL node for the label, if the definition is valid.
2586 Otherwise return 0. */
2589 define_label (location_t location, tree name)
2591 /* Find any preexisting label with this name. It is an error
2592 if that label has already been defined in this function, or
2593 if there is a containing function with a declared label with
2595 tree label = I_LABEL_DECL (name);
2596 struct c_label_list *nlist_se, *nlist_vm;
2599 && ((DECL_CONTEXT (label) == current_function_decl
2600 && DECL_INITIAL (label) != 0)
2601 || (DECL_CONTEXT (label) != current_function_decl
2602 && C_DECLARED_LABEL_FLAG (label))))
2604 error ("%Hduplicate label %qD", &location, label);
2605 locate_old_decl (label, error);
2608 else if (label && DECL_CONTEXT (label) == current_function_decl)
2610 /* The label has been used or declared already in this function,
2611 but not defined. Update its location to point to this
2613 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2614 error ("%Jjump into statement expression", label);
2615 if (C_DECL_UNDEFINABLE_VM (label))
2616 error ("%Jjump into scope of identifier with variably modified type",
2618 DECL_SOURCE_LOCATION (label) = location;
2622 /* No label binding for that identifier; make one. */
2623 label = make_label (name, location);
2625 /* Ordinary labels go in the current function scope. */
2626 bind (name, label, current_function_scope,
2627 /*invisible=*/false, /*nested=*/false);
2630 if (!in_system_header && lookup_name (name))
2631 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2632 "for labels, identifier %qE conflicts", &location, name);
2634 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2635 nlist_se->next = label_context_stack_se->labels_def;
2636 nlist_se->label = label;
2637 label_context_stack_se->labels_def = nlist_se;
2639 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2640 nlist_vm->next = label_context_stack_vm->labels_def;
2641 nlist_vm->label = label;
2642 label_context_stack_vm->labels_def = nlist_vm;
2644 /* Mark label as having been defined. */
2645 DECL_INITIAL (label) = error_mark_node;
2649 /* Given NAME, an IDENTIFIER_NODE,
2650 return the structure (or union or enum) definition for that name.
2651 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2652 CODE says which kind of type the caller wants;
2653 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2654 If the wrong kind of type is found, an error is reported. */
2657 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2659 struct c_binding *b = I_TAG_BINDING (name);
2665 /* We only care about whether it's in this level if
2666 thislevel_only was set or it might be a type clash. */
2667 if (thislevel_only || TREE_CODE (b->decl) != code)
2669 /* For our purposes, a tag in the external scope is the same as
2670 a tag in the file scope. (Primarily relevant to Objective-C
2671 and its builtin structure tags, which get pushed before the
2672 file scope is created.) */
2673 if (B_IN_CURRENT_SCOPE (b)
2674 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2678 if (thislevel_only && !thislevel)
2681 if (TREE_CODE (b->decl) != code)
2683 /* Definition isn't the kind we were looking for. */
2684 pending_invalid_xref = name;
2685 pending_invalid_xref_location = input_location;
2687 /* If in the same binding level as a declaration as a tag
2688 of a different type, this must not be allowed to
2689 shadow that tag, so give the error immediately.
2690 (For example, "struct foo; union foo;" is invalid.) */
2692 pending_xref_error ();
2697 /* Print an error message now
2698 for a recent invalid struct, union or enum cross reference.
2699 We don't print them immediately because they are not invalid
2700 when used in the `struct foo;' construct for shadowing. */
2703 pending_xref_error (void)
2705 if (pending_invalid_xref != 0)
2706 error ("%H%qE defined as wrong kind of tag",
2707 &pending_invalid_xref_location, pending_invalid_xref);
2708 pending_invalid_xref = 0;
2712 /* Look up NAME in the current scope and its superiors
2713 in the namespace of variables, functions and typedefs.
2714 Return a ..._DECL node of some kind representing its definition,
2715 or return 0 if it is undefined. */
2718 lookup_name (tree name)
2720 struct c_binding *b = I_SYMBOL_BINDING (name);
2721 if (b && !b->invisible)
2726 /* Similar to `lookup_name' but look only at the indicated scope. */
2729 lookup_name_in_scope (tree name, struct c_scope *scope)
2731 struct c_binding *b;
2733 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2734 if (B_IN_SCOPE (b, scope))
2739 /* Create the predefined scalar types of C,
2740 and some nodes representing standard constants (0, 1, (void *) 0).
2741 Initialize the global scope.
2742 Make definitions for built-in primitive functions. */
2745 c_init_decl_processing (void)
2747 location_t save_loc = input_location;
2749 /* Initialize reserved words for parser. */
2752 current_function_decl = 0;
2754 gcc_obstack_init (&parser_obstack);
2756 /* Make the externals scope. */
2758 external_scope = current_scope;
2760 /* Declarations from c_common_nodes_and_builtins must not be associated
2761 with this input file, lest we get differences between using and not
2762 using preprocessed headers. */
2763 #ifdef USE_MAPPED_LOCATION
2764 input_location = BUILTINS_LOCATION;
2766 input_location.file = "<built-in>";
2767 input_location.line = 0;
2770 build_common_tree_nodes (flag_signed_char, false);
2772 c_common_nodes_and_builtins ();
2774 /* In C, comparisons and TRUTH_* expressions have type int. */
2775 truthvalue_type_node = integer_type_node;
2776 truthvalue_true_node = integer_one_node;
2777 truthvalue_false_node = integer_zero_node;
2779 /* Even in C99, which has a real boolean type. */
2780 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2781 boolean_type_node));
2783 input_location = save_loc;
2785 pedantic_lvalues = true;
2787 make_fname_decl = c_make_fname_decl;
2788 start_fname_decls ();
2791 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2792 decl, NAME is the initialization string and TYPE_DEP indicates whether
2793 NAME depended on the type of the function. As we don't yet implement
2794 delayed emission of static data, we mark the decl as emitted
2795 so it is not placed in the output. Anything using it must therefore pull
2796 out the STRING_CST initializer directly. FIXME. */
2799 c_make_fname_decl (tree id, int type_dep)
2801 const char *name = fname_as_string (type_dep);
2802 tree decl, type, init;
2803 size_t length = strlen (name);
2805 type = build_array_type (char_type_node,
2806 build_index_type (size_int (length)));
2807 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2809 decl = build_decl (VAR_DECL, id, type);
2811 TREE_STATIC (decl) = 1;
2812 TREE_READONLY (decl) = 1;
2813 DECL_ARTIFICIAL (decl) = 1;
2815 init = build_string (length + 1, name);
2816 free ((char *) name);
2817 TREE_TYPE (init) = type;
2818 DECL_INITIAL (decl) = init;
2820 TREE_USED (decl) = 1;
2822 if (current_function_decl
2823 /* For invalid programs like this:
2826 const char* p = __FUNCTION__;
2828 the __FUNCTION__ is believed to appear in K&R style function
2829 parameter declarator. In that case we still don't have
2831 && (!errorcount || current_function_scope))
2833 DECL_CONTEXT (decl) = current_function_decl;
2834 bind (id, decl, current_function_scope,
2835 /*invisible=*/false, /*nested=*/false);
2838 finish_decl (decl, init, NULL_TREE);
2844 c_builtin_function (tree decl)
2846 tree type = TREE_TYPE (decl);
2847 tree id = DECL_NAME (decl);
2849 const char *name = IDENTIFIER_POINTER (id);
2850 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2851 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2853 /* Should never be called on a symbol with a preexisting meaning. */
2854 gcc_assert (!I_SYMBOL_BINDING (id));
2856 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2858 /* Builtins in the implementation namespace are made visible without
2859 needing to be explicitly declared. See push_file_scope. */
2860 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2862 TREE_CHAIN (decl) = visible_builtins;
2863 visible_builtins = decl;
2869 /* Called when a declaration is seen that contains no names to declare.
2870 If its type is a reference to a structure, union or enum inherited
2871 from a containing scope, shadow that tag name for the current scope
2872 with a forward reference.
2873 If its type defines a new named structure or union
2874 or defines an enum, it is valid but we need not do anything here.
2875 Otherwise, it is an error. */
2878 shadow_tag (const struct c_declspecs *declspecs)
2880 shadow_tag_warned (declspecs, 0);
2883 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2886 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2888 bool found_tag = false;
2890 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2892 tree value = declspecs->type;
2893 enum tree_code code = TREE_CODE (value);
2895 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2896 /* Used to test also that TYPE_SIZE (value) != 0.
2897 That caused warning for `struct foo;' at top level in the file. */
2899 tree name = TYPE_NAME (value);
2906 if (warned != 1 && code != ENUMERAL_TYPE)
2907 /* Empty unnamed enum OK */
2909 pedwarn ("unnamed struct/union that defines no instances");
2913 else if (!declspecs->tag_defined_p
2914 && declspecs->storage_class != csc_none)
2917 pedwarn ("empty declaration with storage class specifier "
2918 "does not redeclare tag");
2920 pending_xref_error ();
2922 else if (!declspecs->tag_defined_p
2923 && (declspecs->const_p
2924 || declspecs->volatile_p
2925 || declspecs->restrict_p))
2928 pedwarn ("empty declaration with type qualifier "
2929 "does not redeclare tag");
2931 pending_xref_error ();
2935 pending_invalid_xref = 0;
2936 t = lookup_tag (code, name, 1);
2940 t = make_node (code);
2947 if (warned != 1 && !in_system_header)
2949 pedwarn ("useless type name in empty declaration");
2954 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2956 pedwarn ("useless type name in empty declaration");
2960 pending_invalid_xref = 0;
2962 if (declspecs->inline_p)
2964 error ("%<inline%> in empty declaration");
2968 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2970 error ("%<auto%> in file-scope empty declaration");
2974 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2976 error ("%<register%> in file-scope empty declaration");
2980 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2982 warning (0, "useless storage class specifier in empty declaration");
2986 if (!warned && !in_system_header && declspecs->thread_p)
2988 warning (0, "useless %<__thread%> in empty declaration");
2992 if (!warned && !in_system_header && (declspecs->const_p
2993 || declspecs->volatile_p
2994 || declspecs->restrict_p))
2996 warning (0, "useless type qualifier in empty declaration");
3003 pedwarn ("empty declaration");
3008 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3009 bits. SPECS represents declaration specifiers that the grammar
3010 only permits to contain type qualifiers and attributes. */
3013 quals_from_declspecs (const struct c_declspecs *specs)
3015 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3016 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3017 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
3018 gcc_assert (!specs->type
3019 && !specs->decl_attr
3020 && specs->typespec_word == cts_none
3021 && specs->storage_class == csc_none
3022 && !specs->typedef_p
3023 && !specs->explicit_signed_p
3024 && !specs->deprecated_p
3026 && !specs->long_long_p
3029 && !specs->unsigned_p
3030 && !specs->complex_p
3032 && !specs->thread_p);
3036 /* Construct an array declarator. EXPR is the expression inside [],
3037 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3038 applied to the pointer to which a parameter array is converted).
3039 STATIC_P is true if "static" is inside the [], false otherwise.
3040 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3041 length which is nevertheless a complete type, false otherwise. The
3042 field for the contained declarator is left to be filled in by
3043 set_array_declarator_inner. */
3045 struct c_declarator *
3046 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3049 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3050 struct c_declarator);
3051 declarator->kind = cdk_array;
3052 declarator->declarator = 0;
3053 declarator->u.array.dimen = expr;
3056 declarator->u.array.attrs = quals->attrs;
3057 declarator->u.array.quals = quals_from_declspecs (quals);
3061 declarator->u.array.attrs = NULL_TREE;
3062 declarator->u.array.quals = 0;
3064 declarator->u.array.static_p = static_p;
3065 declarator->u.array.vla_unspec_p = vla_unspec_p;
3066 if (pedantic && !flag_isoc99)
3068 if (static_p || quals != NULL)
3069 pedwarn ("ISO C90 does not support %<static%> or type "
3070 "qualifiers in parameter array declarators");
3072 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3076 if (!current_scope->parm_flag)
3079 error ("%<[*]%> not allowed in other than function prototype scope");
3080 declarator->u.array.vla_unspec_p = false;
3083 current_scope->had_vla_unspec = true;
3088 /* Set the contained declarator of an array declarator. DECL is the
3089 declarator, as constructed by build_array_declarator; INNER is what
3090 appears on the left of the []. ABSTRACT_P is true if it is an
3091 abstract declarator, false otherwise; this is used to reject static
3092 and type qualifiers in abstract declarators, where they are not in
3093 the C99 grammar (subject to possible change in DR#289). */
3095 struct c_declarator *
3096 set_array_declarator_inner (struct c_declarator *decl,
3097 struct c_declarator *inner, bool abstract_p)
3099 decl->declarator = inner;
3100 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
3101 || decl->u.array.attrs != NULL_TREE
3102 || decl->u.array.static_p))
3103 error ("static or type qualifiers in abstract declarator");
3107 /* INIT is a constructor that forms DECL's initializer. If the final
3108 element initializes a flexible array field, add the size of that
3109 initializer to DECL's size. */
3112 add_flexible_array_elts_to_size (tree decl, tree init)
3116 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3119 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3120 type = TREE_TYPE (elt);
3121 if (TREE_CODE (type) == ARRAY_TYPE
3122 && TYPE_SIZE (type) == NULL_TREE
3123 && TYPE_DOMAIN (type) != NULL_TREE
3124 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3126 complete_array_type (&type, elt, false);
3128 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3129 DECL_SIZE_UNIT (decl)
3130 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3134 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3137 groktypename (struct c_type_name *type_name)
3140 tree attrs = type_name->specs->attrs;
3142 type_name->specs->attrs = NULL_TREE;
3144 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3147 /* Apply attributes. */
3148 decl_attributes (&type, attrs, 0);
3153 /* Decode a declarator in an ordinary declaration or data definition.
3154 This is called as soon as the type information and variable name
3155 have been parsed, before parsing the initializer if any.
3156 Here we create the ..._DECL node, fill in its type,
3157 and put it on the list of decls for the current context.
3158 The ..._DECL node is returned as the value.
3160 Exception: for arrays where the length is not specified,
3161 the type is left null, to be filled in by `finish_decl'.
3163 Function definitions do not come here; they go to start_function
3164 instead. However, external and forward declarations of functions
3165 do go through here. Structure field declarations are done by
3166 grokfield and not through here. */
3169 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3170 bool initialized, tree attributes)
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);
3185 deprecated_state = DEPRECATED_NORMAL;
3187 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3188 && MAIN_NAME_P (DECL_NAME (decl)))
3189 warning (OPT_Wmain, "%q+D is usually a function", decl);
3192 /* Is it valid for this decl to have an initializer at all?
3193 If not, set INITIALIZED to zero, which will indirectly
3194 tell 'finish_decl' to ignore the initializer once it is parsed. */
3195 switch (TREE_CODE (decl))
3198 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3203 error ("function %qD is initialized like a variable", decl);
3208 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3209 error ("parameter %qD is initialized", decl);
3214 /* Don't allow initializations for incomplete types except for
3215 arrays which might be completed by the initialization. */
3217 /* This can happen if the array size is an undefined macro.
3218 We already gave a warning, so we don't need another one. */
3219 if (TREE_TYPE (decl) == error_mark_node)
3221 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3223 /* A complete type is ok if size is fixed. */
3225 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3226 || C_DECL_VARIABLE_SIZE (decl))
3228 error ("variable-sized object may not be initialized");
3232 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3234 error ("variable %qD has initializer but incomplete type", decl);
3237 else if (C_DECL_VARIABLE_SIZE (decl))
3239 /* Although C99 is unclear about whether incomplete arrays
3240 of VLAs themselves count as VLAs, it does not make
3241 sense to permit them to be initialized given that
3242 ordinary VLAs may not be initialized. */
3243 error ("variable-sized object may not be initialized");
3250 if (current_scope == file_scope)
3251 TREE_STATIC (decl) = 1;
3253 /* Tell 'pushdecl' this is an initialized decl
3254 even though we don't yet have the initializer expression.
3255 Also tell 'finish_decl' it may store the real initializer. */
3256 DECL_INITIAL (decl) = error_mark_node;
3259 /* If this is a function declaration, write a record describing it to the
3260 prototypes file (if requested). */
3262 if (TREE_CODE (decl) == FUNCTION_DECL)
3263 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3265 /* ANSI specifies that a tentative definition which is not merged with
3266 a non-tentative definition behaves exactly like a definition with an
3267 initializer equal to zero. (Section 3.7.2)
3269 -fno-common gives strict ANSI behavior, though this tends to break
3270 a large body of code that grew up without this rule.
3272 Thread-local variables are never common, since there's no entrenched
3273 body of code to break, and it allows more efficient variable references
3274 in the presence of dynamic linking. */
3276 if (TREE_CODE (decl) == VAR_DECL
3278 && TREE_PUBLIC (decl)
3279 && !DECL_THREAD_LOCAL_P (decl)
3281 DECL_COMMON (decl) = 1;
3283 /* Set attributes here so if duplicate decl, will have proper attributes. */
3284 decl_attributes (&decl, attributes, 0);
3286 /* Handle gnu_inline attribute. */
3287 if (declspecs->inline_p
3288 && !flag_gnu89_inline
3289 && TREE_CODE (decl) == FUNCTION_DECL
3290 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl)))
3292 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
3294 else if (declspecs->storage_class != csc_static)
3295 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
3298 if (TREE_CODE (decl) == FUNCTION_DECL
3299 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3301 struct c_declarator *ce = declarator;
3303 if (ce->kind == cdk_pointer)
3304 ce = declarator->declarator;
3305 if (ce->kind == cdk_function)
3307 tree args = ce->u.arg_info->parms;
3308 for (; args; args = TREE_CHAIN (args))
3310 tree type = TREE_TYPE (args);
3311 if (type && INTEGRAL_TYPE_P (type)
3312 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3313 DECL_ARG_TYPE (args) = integer_type_node;
3318 if (TREE_CODE (decl) == FUNCTION_DECL
3319 && DECL_DECLARED_INLINE_P (decl)
3320 && DECL_UNINLINABLE (decl)
3321 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3322 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3325 /* C99 6.7.4p3: An inline definition of a function with external
3326 linkage shall not contain a definition of a modifiable object
3327 with static storage duration... */
3328 if (TREE_CODE (decl) == VAR_DECL
3329 && current_scope != file_scope
3330 && TREE_STATIC (decl)
3331 && DECL_DECLARED_INLINE_P (current_function_decl)
3332 && DECL_EXTERNAL (current_function_decl))
3333 pedwarn ("%q+D is static but declared in inline function %qD "
3334 "which is not static", decl, current_function_decl);
3336 /* Add this decl to the current scope.
3337 TEM may equal DECL or it may be a previous decl of the same name. */
3338 tem = pushdecl (decl);
3340 if (initialized && DECL_EXTERNAL (tem))
3342 DECL_EXTERNAL (tem) = 0;
3343 TREE_STATIC (tem) = 1;
3349 /* Initialize EH if not initialized yet and exceptions are enabled. */
3352 c_maybe_initialize_eh (void)
3354 if (!flag_exceptions || c_eh_initialized_p)
3357 c_eh_initialized_p = true;
3358 eh_personality_libfunc
3359 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3360 ? "__gcc_personality_sj0"
3361 : "__gcc_personality_v0");
3362 default_init_unwind_resume_libfunc ();
3363 using_eh_for_cleanups ();
3366 /* Finish processing of a declaration;
3367 install its initial value.
3368 If the length of an array type is not known before,
3369 it must be determined now, from the initial value, or it is an error. */
3372 finish_decl (tree decl, tree init, tree asmspec_tree)
3375 int was_incomplete = (DECL_SIZE (decl) == 0);
3376 const char *asmspec = 0;
3378 /* If a name was specified, get the string. */
3379 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3380 && DECL_FILE_SCOPE_P (decl))
3381 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3383 asmspec = TREE_STRING_POINTER (asmspec_tree);
3385 /* If `start_decl' didn't like having an initialization, ignore it now. */
3386 if (init != 0 && DECL_INITIAL (decl) == 0)
3389 /* Don't crash if parm is initialized. */
3390 if (TREE_CODE (decl) == PARM_DECL)
3394 store_init_value (decl, init);
3396 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3397 || TREE_CODE (decl) == FUNCTION_DECL
3398 || TREE_CODE (decl) == FIELD_DECL))
3399 objc_check_decl (decl);
3401 type = TREE_TYPE (decl);
3403 /* Deduce size of array from initialization, if not already known. */
3404 if (TREE_CODE (type) == ARRAY_TYPE
3405 && TYPE_DOMAIN (type) == 0
3406 && TREE_CODE (decl) != TYPE_DECL)
3409 = (TREE_STATIC (decl)
3410 /* Even if pedantic, an external linkage array
3411 may have incomplete type at first. */
3412 ? pedantic && !TREE_PUBLIC (decl)
3413 : !DECL_EXTERNAL (decl));
3415 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3418 /* Get the completed type made by complete_array_type. */
3419 type = TREE_TYPE (decl);
3424 error ("initializer fails to determine size of %q+D", decl);
3429 error ("array size missing in %q+D", decl);
3430 /* If a `static' var's size isn't known,
3431 make it extern as well as static, so it does not get
3433 If it is not `static', then do not mark extern;
3434 finish_incomplete_decl will give it a default size
3435 and it will get allocated. */
3436 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3437 DECL_EXTERNAL (decl) = 1;
3441 error ("zero or negative size array %q+D", decl);
3445 /* For global variables, update the copy of the type that
3446 exists in the binding. */
3447 if (TREE_PUBLIC (decl))
3449 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3450 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3451 b_ext = b_ext->shadowed;
3455 b_ext->type = composite_type (b_ext->type, type);
3466 if (DECL_INITIAL (decl))
3467 TREE_TYPE (DECL_INITIAL (decl)) = type;
3469 layout_decl (decl, 0);
3472 if (TREE_CODE (decl) == VAR_DECL)
3474 if (init && TREE_CODE (init) == CONSTRUCTOR)
3475 add_flexible_array_elts_to_size (decl, init);
3477 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3478 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3479 layout_decl (decl, 0);
3481 if (DECL_SIZE (decl) == 0
3482 /* Don't give an error if we already gave one earlier. */
3483 && TREE_TYPE (decl) != error_mark_node
3484 && (TREE_STATIC (decl)
3485 /* A static variable with an incomplete type
3486 is an error if it is initialized.
3487 Also if it is not file scope.
3488 Otherwise, let it through, but if it is not `extern'
3489 then it may cause an error message later. */
3490 ? (DECL_INITIAL (decl) != 0
3491 || !DECL_FILE_SCOPE_P (decl))
3492 /* An automatic variable with an incomplete type
3494 : !DECL_EXTERNAL (decl)))
3496 error ("storage size of %q+D isn%'t known", decl);
3497 TREE_TYPE (decl) = error_mark_node;
3500 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3501 && DECL_SIZE (decl) != 0)
3503 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3504 constant_expression_warning (DECL_SIZE (decl));
3506 error ("storage size of %q+D isn%'t constant", decl);
3509 if (TREE_USED (type))
3510 TREE_USED (decl) = 1;
3513 /* If this is a function and an assembler name is specified, reset DECL_RTL
3514 so we can give it its new name. Also, update built_in_decls if it
3515 was a normal built-in. */
3516 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3518 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3519 set_builtin_user_assembler_name (decl, asmspec);
3520 set_user_assembler_name (decl, asmspec);
3523 /* If #pragma weak was used, mark the decl weak now. */
3524 maybe_apply_pragma_weak (decl);
3526 /* Output the assembler code and/or RTL code for variables and functions,
3527 unless the type is an undefined structure or union.
3528 If not, it will get done when the type is completed. */
3530 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3532 /* Determine the ELF visibility. */
3533 if (TREE_PUBLIC (decl))
3534 c_determine_visibility (decl);
3536 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3537 if (c_dialect_objc ())
3538 objc_check_decl (decl);
3542 /* If this is not a static variable, issue a warning.
3543 It doesn't make any sense to give an ASMSPEC for an
3544 ordinary, non-register local variable. Historically,
3545 GCC has accepted -- but ignored -- the ASMSPEC in
3547 if (!DECL_FILE_SCOPE_P (decl)
3548 && TREE_CODE (decl) == VAR_DECL
3549 && !C_DECL_REGISTER (decl)
3550 && !TREE_STATIC (decl))
3551 warning (0, "ignoring asm-specifier for non-static local "
3552 "variable %q+D", decl);
3554 set_user_assembler_name (decl, asmspec);
3557 if (DECL_FILE_SCOPE_P (decl))
3559 if (DECL_INITIAL (decl) == NULL_TREE
3560 || DECL_INITIAL (decl) == error_mark_node)
3561 /* Don't output anything
3562 when a tentative file-scope definition is seen.
3563 But at end of compilation, do output code for them. */
3564 DECL_DEFER_OUTPUT (decl) = 1;
3565 rest_of_decl_compilation (decl, true, 0);
3569 /* In conjunction with an ASMSPEC, the `register'
3570 keyword indicates that we should place the variable
3571 in a particular register. */
3572 if (asmspec && C_DECL_REGISTER (decl))
3574 DECL_HARD_REGISTER (decl) = 1;
3575 /* This cannot be done for a structure with volatile
3576 fields, on which DECL_REGISTER will have been
3578 if (!DECL_REGISTER (decl))
3579 error ("cannot put object with volatile field into register");
3582 if (TREE_CODE (decl) != FUNCTION_DECL)
3584 /* If we're building a variable sized type, and we might be
3585 reachable other than via the top of the current binding
3586 level, then create a new BIND_EXPR so that we deallocate
3587 the object at the right time. */
3588 /* Note that DECL_SIZE can be null due to errors. */
3589 if (DECL_SIZE (decl)
3590 && !TREE_CONSTANT (DECL_SIZE (decl))
3591 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3594 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3595 TREE_SIDE_EFFECTS (bind) = 1;
3597 BIND_EXPR_BODY (bind) = push_stmt_list ();
3599 add_stmt (build_stmt (DECL_EXPR, decl));
3604 if (!DECL_FILE_SCOPE_P (decl))
3606 /* Recompute the RTL of a local array now
3607 if it used to be an incomplete type. */
3609 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3611 /* If we used it already as memory, it must stay in memory. */
3612 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3613 /* If it's still incomplete now, no init will save it. */
3614 if (DECL_SIZE (decl) == 0)
3615 DECL_INITIAL (decl) = 0;
3620 /* If this was marked 'used', be sure it will be output. */
3621 if (!flag_unit_at_a_time && lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3622 mark_decl_referenced (decl);
3624 if (TREE_CODE (decl) == TYPE_DECL)
3626 if (!DECL_FILE_SCOPE_P (decl)
3627 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3628 add_stmt (build_stmt (DECL_EXPR, decl));
3630 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3633 /* At the end of a declaration, throw away any variable type sizes
3634 of types defined inside that declaration. There is no use
3635 computing them in the following function definition. */
3636 if (current_scope == file_scope)
3637 get_pending_sizes ();
3639 /* Install a cleanup (aka destructor) if one was given. */
3640 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3642 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3645 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3646 tree cleanup_decl = lookup_name (cleanup_id);
3649 /* Build "cleanup(&decl)" for the destructor. */
3650 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3651 cleanup = build_tree_list (NULL_TREE, cleanup);
3652 cleanup = build_function_call (cleanup_decl, cleanup);
3654 /* Don't warn about decl unused; the cleanup uses it. */
3655 TREE_USED (decl) = 1;
3656 TREE_USED (cleanup_decl) = 1;
3658 /* Initialize EH, if we've been told to do so. */
3659 c_maybe_initialize_eh ();
3661 push_cleanup (decl, cleanup, false);
3666 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3669 grokparm (const struct c_parm *parm)
3671 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3674 decl_attributes (&decl, parm->attrs, 0);
3679 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3680 and push that on the current scope. */
3683 push_parm_decl (const struct c_parm *parm)
3687 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.
3961 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3962 It may also be so in the PARM case, for a prototype where the
3963 argument type is specified but not the name.
3965 This function is where the complicated C meanings of `static'
3966 and `extern' are interpreted. */
3969 grokdeclarator (const struct c_declarator *declarator,
3970 struct c_declspecs *declspecs,
3971 enum decl_context decl_context, bool initialized, tree *width)
3973 tree type = declspecs->type;
3974 bool threadp = declspecs->thread_p;
3975 enum c_storage_class storage_class = declspecs->storage_class;
3979 int type_quals = TYPE_UNQUALIFIED;
3980 const char *name, *orig_name;
3981 tree typedef_type = 0;
3982 bool funcdef_flag = false;
3983 bool funcdef_syntax = false;
3984 int size_varies = 0;
3985 tree decl_attr = declspecs->decl_attr;
3986 int array_ptr_quals = TYPE_UNQUALIFIED;
3987 tree array_ptr_attrs = NULL_TREE;
3988 int array_parm_static = 0;
3989 bool array_parm_vla_unspec_p = false;
3990 tree returned_attrs = NULL_TREE;
3991 bool bitfield = width != NULL;
3993 struct c_arg_info *arg_info = 0;
3995 if (decl_context == FUNCDEF)
3996 funcdef_flag = true, decl_context = NORMAL;
3998 /* Look inside a declarator for the name being declared
3999 and get it as a string, for an error message. */
4001 const struct c_declarator *decl = declarator;
4010 funcdef_syntax = (decl->kind == cdk_function);
4011 decl = decl->declarator;
4015 decl = decl->declarator;
4020 name = IDENTIFIER_POINTER (decl->u.id);
4032 /* A function definition's declarator must have the form of
4033 a function declarator. */
4035 if (funcdef_flag && !funcdef_syntax)
4038 /* If this looks like a function definition, make it one,
4039 even if it occurs where parms are expected.
4040 Then store_parm_decls will reject it and not use it as a parm. */
4041 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4042 decl_context = PARM;
4044 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4045 warn_deprecated_use (declspecs->type);
4047 if ((decl_context == NORMAL || decl_context == FIELD)
4048 && current_scope == file_scope
4049 && variably_modified_type_p (type, NULL_TREE))
4051 error ("variably modified %qs at file scope", name);
4052 type = integer_type_node;
4055 typedef_type = type;
4056 size_varies = C_TYPE_VARIABLE_SIZE (type);
4058 /* Diagnose defaulting to "int". */
4060 if (declspecs->default_int_p && !in_system_header)
4062 /* Issue a warning if this is an ISO C 99 program or if
4063 -Wreturn-type and this is a function, or if -Wimplicit;
4064 prefer the former warning since it is more explicit. */
4065 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4067 warn_about_return_type = 1;
4068 else if (warn_implicit_int || flag_isoc99)
4069 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
4072 /* Adjust the type if a bit-field is being declared,
4073 -funsigned-bitfields applied and the type is not explicitly
4075 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4076 && TREE_CODE (type) == INTEGER_TYPE)
4077 type = unsigned_type_for (type);
4079 /* Figure out the type qualifiers for the declaration. There are
4080 two ways a declaration can become qualified. One is something
4081 like `const int i' where the `const' is explicit. Another is
4082 something like `typedef const int CI; CI i' where the type of the
4083 declaration contains the `const'. A third possibility is that
4084 there is a type qualifier on the element type of a typedefed
4085 array type, in which case we should extract that qualifier so
4086 that c_apply_type_quals_to_decls receives the full list of
4087 qualifiers to work with (C90 is not entirely clear about whether
4088 duplicate qualifiers should be diagnosed in this case, but it
4089 seems most appropriate to do so). */
4090 element_type = strip_array_types (type);
4091 constp = declspecs->const_p + TYPE_READONLY (element_type);
4092 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4093 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4094 if (pedantic && !flag_isoc99)
4097 pedwarn ("duplicate %<const%>");
4099 pedwarn ("duplicate %<restrict%>");
4101 pedwarn ("duplicate %<volatile%>");
4103 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4104 type = TYPE_MAIN_VARIANT (type);
4105 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4106 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4107 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4109 /* Warn about storage classes that are invalid for certain
4110 kinds of declarations (parameters, typenames, etc.). */
4114 || storage_class == csc_auto
4115 || storage_class == csc_register
4116 || storage_class == csc_typedef))
4118 if (storage_class == csc_auto
4119 && (pedantic || current_scope == file_scope))
4120 pedwarn ("function definition declared %<auto%>");
4121 if (storage_class == csc_register)
4122 error ("function definition declared %<register%>");
4123 if (storage_class == csc_typedef)
4124 error ("function definition declared %<typedef%>");
4126 error ("function definition declared %<__thread%>");
4128 if (storage_class == csc_auto
4129 || storage_class == csc_register
4130 || storage_class == csc_typedef)
4131 storage_class = csc_none;
4133 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4135 if (decl_context == PARM && storage_class == csc_register)
4139 switch (decl_context)
4142 error ("storage class specified for structure field %qs",
4146 error ("storage class specified for parameter %qs", name);
4149 error ("storage class specified for typename");
4152 storage_class = csc_none;
4156 else if (storage_class == csc_extern
4160 /* 'extern' with initialization is invalid if not at file scope. */
4161 if (current_scope == file_scope)
4163 /* It is fine to have 'extern const' when compiling at C
4164 and C++ intersection. */
4165 if (!(warn_cxx_compat && constp))
4166 warning (0, "%qs initialized and declared %<extern%>", name);
4169 error ("%qs has both %<extern%> and initializer", name);
4171 else if (current_scope == file_scope)
4173 if (storage_class == csc_auto)
4174 error ("file-scope declaration of %qs specifies %<auto%>", name);
4175 if (pedantic && storage_class == csc_register)
4176 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
4180 if (storage_class == csc_extern && funcdef_flag)
4181 error ("nested function %qs declared %<extern%>", name);
4182 else if (threadp && storage_class == csc_none)
4184 error ("function-scope %qs implicitly auto and declared "
4191 /* Now figure out the structure of the declarator proper.
4192 Descend through it, creating more complex types, until we reach
4193 the declared identifier (or NULL_TREE, in an absolute declarator).
4194 At each stage we maintain an unqualified version of the type
4195 together with any qualifiers that should be applied to it with
4196 c_build_qualified_type; this way, array types including
4197 multidimensional array types are first built up in unqualified
4198 form and then the qualified form is created with
4199 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4201 while (declarator && declarator->kind != cdk_id)
4203 if (type == error_mark_node)
4205 declarator = declarator->declarator;
4209 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4210 a cdk_pointer (for *...),
4211 a cdk_function (for ...(...)),
4212 a cdk_attrs (for nested attributes),
4213 or a cdk_id (for the name being declared
4214 or the place in an absolute declarator
4215 where the name was omitted).
4216 For the last case, we have just exited the loop.
4218 At this point, TYPE is the type of elements of an array,
4219 or for a function to return, or for a pointer to point to.
4220 After this sequence of ifs, TYPE is the type of the
4221 array or function or pointer, and DECLARATOR has had its
4222 outermost layer removed. */
4224 if (array_ptr_quals != TYPE_UNQUALIFIED
4225 || array_ptr_attrs != NULL_TREE
4226 || array_parm_static)
4228 /* Only the innermost declarator (making a parameter be of
4229 array type which is converted to pointer type)
4230 may have static or type qualifiers. */
4231 error ("static or type qualifiers in non-parameter array declarator");
4232 array_ptr_quals = TYPE_UNQUALIFIED;
4233 array_ptr_attrs = NULL_TREE;
4234 array_parm_static = 0;
4237 switch (declarator->kind)
4241 /* A declarator with embedded attributes. */
4242 tree attrs = declarator->u.attrs;
4243 const struct c_declarator *inner_decl;
4245 declarator = declarator->declarator;
4246 inner_decl = declarator;
4247 while (inner_decl->kind == cdk_attrs)
4248 inner_decl = inner_decl->declarator;
4249 if (inner_decl->kind == cdk_id)
4250 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4251 else if (inner_decl->kind == cdk_function)
4252 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4253 else if (inner_decl->kind == cdk_array)
4254 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4255 returned_attrs = decl_attributes (&type,
4256 chainon (returned_attrs, attrs),
4262 tree itype = NULL_TREE;
4263 tree size = declarator->u.array.dimen;
4264 /* The index is a signed object `sizetype' bits wide. */
4265 tree index_type = c_common_signed_type (sizetype);
4267 array_ptr_quals = declarator->u.array.quals;
4268 array_ptr_attrs = declarator->u.array.attrs;
4269 array_parm_static = declarator->u.array.static_p;
4270 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
4272 declarator = declarator->declarator;
4274 /* Check for some types that there cannot be arrays of. */
4276 if (VOID_TYPE_P (type))
4278 error ("declaration of %qs as array of voids", name);
4279 type = error_mark_node;
4282 if (TREE_CODE (type) == FUNCTION_TYPE)
4284 error ("declaration of %qs as array of functions", name);
4285 type = error_mark_node;
4288 if (pedantic && !in_system_header && flexible_array_type_p (type))
4289 pedwarn ("invalid use of structure with flexible array member");
4291 if (size == error_mark_node)
4292 type = error_mark_node;
4294 if (type == error_mark_node)
4297 /* If size was specified, set ITYPE to a range-type for
4298 that size. Otherwise, ITYPE remains null. finish_decl
4299 may figure it out from an initial value. */
4303 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4305 STRIP_TYPE_NOPS (size);
4307 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4309 error ("size of array %qs has non-integer type", name);
4310 size = integer_one_node;
4313 if (pedantic && integer_zerop (size))
4314 pedwarn ("ISO C forbids zero-size array %qs", name);
4316 if (TREE_CODE (size) == INTEGER_CST)
4318 constant_expression_warning (size);
4319 if (tree_int_cst_sgn (size) < 0)
4321 error ("size of array %qs is negative", name);
4322 size = integer_one_node;
4325 else if ((decl_context == NORMAL || decl_context == FIELD)
4326 && current_scope == file_scope)
4328 error ("variably modified %qs at file scope", name);
4329 size = integer_one_node;
4333 /* Make sure the array size remains visibly
4334 nonconstant even if it is (eg) a const variable
4335 with known value. */
4337 warn_variable_length_array (orig_name, size);
4340 if (integer_zerop (size))
4342 /* A zero-length array cannot be represented with
4343 an unsigned index type, which is what we'll
4344 get with build_index_type. Create an
4345 open-ended range instead. */
4346 itype = build_range_type (sizetype, size, NULL_TREE);
4350 /* Arrange for the SAVE_EXPR on the inside of the
4351 MINUS_EXPR, which allows the -1 to get folded
4352 with the +1 that happens when building TYPE_SIZE. */
4354 size = variable_size (size);
4356 /* Compute the maximum valid index, that is, size
4357 - 1. Do the calculation in index_type, so that
4358 if it is a variable the computations will be
4359 done in the proper mode. */
4360 itype = fold_build2 (MINUS_EXPR, index_type,
4361 convert (index_type, size),
4362 convert (index_type,
4365 /* If that overflowed, the array is too big. ???
4366 While a size of INT_MAX+1 technically shouldn't
4367 cause an overflow (because we subtract 1), the
4368 overflow is recorded during the conversion to
4369 index_type, before the subtraction. Handling
4370 this case seems like an unnecessary
4372 if (TREE_CODE (itype) == INTEGER_CST
4373 && TREE_OVERFLOW (itype))
4375 error ("size of array %qs is too large", name);
4376 type = error_mark_node;
4380 itype = build_index_type (itype);
4383 else if (decl_context == FIELD)
4385 if (pedantic && !flag_isoc99 && !in_system_header)
4386 pedwarn ("ISO C90 does not support flexible array members");
4388 /* ISO C99 Flexible array members are effectively
4389 identical to GCC's zero-length array extension. */
4390 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4392 else if (decl_context == PARM)
4394 if (array_parm_vla_unspec_p)
4399 error ("%<[*]%> not allowed in other than a declaration");
4402 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4406 else if (decl_context == TYPENAME)
4408 if (array_parm_vla_unspec_p)
4410 /* The error is printed elsewhere. We use this to
4411 avoid messing up with incomplete array types of
4412 the same type, that would otherwise be modified
4414 itype = build_range_type (sizetype, size_zero_node,
4419 /* Complain about arrays of incomplete types. */
4420 if (!COMPLETE_TYPE_P (type))
4422 error ("array type has incomplete element type");
4423 type = error_mark_node;
4426 /* When itype is NULL, a shared incomplete array type is
4427 returned for all array of a given type. Elsewhere we
4428 make sure we don't complete that type before copying
4429 it, but here we want to make sure we don't ever
4430 modify the shared type, so we gcc_assert (itype)
4432 type = build_array_type (type, itype);
4434 if (type != error_mark_node)
4438 /* It is ok to modify type here even if itype is
4439 NULL: if size_varies, we're in a
4440 multi-dimensional array and the inner type has
4441 variable size, so the enclosing shared array type
4443 if (size && TREE_CODE (size) == INTEGER_CST)
4445 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
4446 C_TYPE_VARIABLE_SIZE (type) = 1;
4449 /* The GCC extension for zero-length arrays differs from
4450 ISO flexible array members in that sizeof yields
4452 if (size && integer_zerop (size))
4455 TYPE_SIZE (type) = bitsize_zero_node;
4456 TYPE_SIZE_UNIT (type) = size_zero_node;
4458 if (array_parm_vla_unspec_p)
4461 /* The type is complete. C99 6.7.5.2p4 */
4462 TYPE_SIZE (type) = bitsize_zero_node;
4463 TYPE_SIZE_UNIT (type) = size_zero_node;
4467 if (decl_context != PARM
4468 && (array_ptr_quals != TYPE_UNQUALIFIED
4469 || array_ptr_attrs != NULL_TREE
4470 || array_parm_static))
4472 error ("static or type qualifiers in non-parameter array declarator");
4473 array_ptr_quals = TYPE_UNQUALIFIED;
4474 array_ptr_attrs = NULL_TREE;
4475 array_parm_static = 0;
4481 /* Say it's a definition only for the declarator closest
4482 to the identifier, apart possibly from some
4484 bool really_funcdef = false;
4488 const struct c_declarator *t = declarator->declarator;
4489 while (t->kind == cdk_attrs)
4491 really_funcdef = (t->kind == cdk_id);
4494 /* Declaring a function type. Make sure we have a valid
4495 type for the function to return. */
4496 if (type == error_mark_node)
4501 /* Warn about some types functions can't return. */
4502 if (TREE_CODE (type) == FUNCTION_TYPE)
4504 error ("%qs declared as function returning a function", name);
4505 type = integer_type_node;
4507 if (TREE_CODE (type) == ARRAY_TYPE)
4509 error ("%qs declared as function returning an array", name);
4510 type = integer_type_node;
4513 /* Construct the function type and go to the next
4514 inner layer of declarator. */
4515 arg_info = declarator->u.arg_info;
4516 arg_types = grokparms (arg_info, really_funcdef);
4518 put_pending_sizes (arg_info->pending_sizes);
4520 /* Type qualifiers before the return type of the function
4521 qualify the return type, not the function type. */
4524 /* Type qualifiers on a function return type are
4525 normally permitted by the standard but have no
4526 effect, so give a warning at -Wreturn-type.
4527 Qualifiers on a void return type are banned on
4528 function definitions in ISO C; GCC used to used
4529 them for noreturn functions. */
4530 if (VOID_TYPE_P (type) && really_funcdef)
4531 pedwarn ("function definition has qualified void return type");
4533 warning (OPT_Wreturn_type,
4534 "type qualifiers ignored on function return type");
4536 type = c_build_qualified_type (type, type_quals);
4538 type_quals = TYPE_UNQUALIFIED;
4540 type = build_function_type (type, arg_types);
4541 declarator = declarator->declarator;
4543 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4544 the formal parameter list of this FUNCTION_TYPE to point to
4545 the FUNCTION_TYPE node itself. */
4549 for (link = arg_info->tags;
4551 link = TREE_CHAIN (link))
4552 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4558 /* Merge any constancy or volatility into the target type
4561 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4563 pedwarn ("ISO C forbids qualified function types");
4565 type = c_build_qualified_type (type, type_quals);
4568 /* When the pointed-to type involves components of variable size,
4569 care must be taken to ensure that the size evaluation code is
4570 emitted early enough to dominate all the possible later uses
4571 and late enough for the variables on which it depends to have
4574 This is expected to happen automatically when the pointed-to
4575 type has a name/declaration of it's own, but special attention
4576 is required if the type is anonymous.
4578 We handle the NORMAL and FIELD contexts here by attaching an
4579 artificial TYPE_DECL to such pointed-to type. This forces the
4580 sizes evaluation at a safe point and ensures it is not deferred
4581 until e.g. within a deeper conditional context.
4583 We expect nothing to be needed here for PARM or TYPENAME.
4584 Pushing a TYPE_DECL at this point for TYPENAME would actually
4585 be incorrect, as we might be in the middle of an expression
4586 with side effects on the pointed-to type size "arguments" prior
4587 to the pointer declaration point and the fake TYPE_DECL in the
4588 enclosing context would force the size evaluation prior to the
4591 if (!TYPE_NAME (type)
4592 && (decl_context == NORMAL || decl_context == FIELD)
4593 && variably_modified_type_p (type, NULL_TREE))
4595 tree decl = build_decl (TYPE_DECL, NULL_TREE, type);
4596 DECL_ARTIFICIAL (decl) = 1;
4598 finish_decl (decl, NULL_TREE, NULL_TREE);
4599 TYPE_NAME (type) = decl;
4602 type = build_pointer_type (type);
4604 /* Process type qualifiers (such as const or volatile)
4605 that were given inside the `*'. */
4606 type_quals = declarator->u.pointer_quals;
4608 declarator = declarator->declarator;
4616 /* Now TYPE has the actual type, apart from any qualifiers in
4619 /* Check the type and width of a bit-field. */
4621 check_bitfield_type_and_width (&type, width, orig_name);
4623 /* Did array size calculations overflow? */
4625 if (TREE_CODE (type) == ARRAY_TYPE
4626 && COMPLETE_TYPE_P (type)
4627 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4628 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4630 error ("size of array %qs is too large", name);
4631 /* If we proceed with the array type as it is, we'll eventually
4632 crash in tree_low_cst(). */
4633 type = error_mark_node;
4636 /* If this is declaring a typedef name, return a TYPE_DECL. */
4638 if (storage_class == csc_typedef)
4641 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4643 pedwarn ("ISO C forbids qualified function types");
4645 type = c_build_qualified_type (type, type_quals);
4646 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4647 if (declspecs->explicit_signed_p)
4648 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4649 decl_attributes (&decl, returned_attrs, 0);
4650 if (declspecs->inline_p)
4651 pedwarn ("typedef %q+D declared %<inline%>", decl);
4655 /* If this is a type name (such as, in a cast or sizeof),
4656 compute the type and return it now. */
4658 if (decl_context == TYPENAME)
4660 /* Note that the grammar rejects storage classes in typenames
4662 gcc_assert (storage_class == csc_none && !threadp
4663 && !declspecs->inline_p);
4664 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4666 pedwarn ("ISO C forbids const or volatile function types");
4668 type = c_build_qualified_type (type, type_quals);
4669 decl_attributes (&type, returned_attrs, 0);
4673 if (pedantic && decl_context == FIELD
4674 && variably_modified_type_p (type, NULL_TREE))
4677 pedwarn ("a member of a structure or union cannot have a variably modified type");
4680 /* Aside from typedefs and type names (handle above),
4681 `void' at top level (not within pointer)
4682 is allowed only in public variables.
4683 We don't complain about parms either, but that is because
4684 a better error message can be made later. */
4686 if (VOID_TYPE_P (type) && decl_context != PARM
4687 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4688 && (storage_class == csc_extern
4689 || (current_scope == file_scope
4690 && !(storage_class == csc_static
4691 || storage_class == csc_register)))))
4693 error ("variable or field %qs declared void", name);
4694 type = integer_type_node;
4697 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4698 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4703 if (decl_context == PARM)
4705 tree type_as_written;
4708 /* A parameter declared as an array of T is really a pointer to T.
4709 One declared as a function is really a pointer to a function. */
4711 if (TREE_CODE (type) == ARRAY_TYPE)
4713 /* Transfer const-ness of array into that of type pointed to. */
4714 type = TREE_TYPE (type);
4716 type = c_build_qualified_type (type, type_quals);
4717 type = build_pointer_type (type);
4718 type_quals = array_ptr_quals;
4720 /* We don't yet implement attributes in this context. */
4721 if (array_ptr_attrs != NULL_TREE)
4722 warning (OPT_Wattributes,
4723 "attributes in parameter array declarator ignored");
4727 else if (TREE_CODE (type) == FUNCTION_TYPE)
4729 if (pedantic && type_quals)
4730 pedwarn ("ISO C forbids qualified function types");
4732 type = c_build_qualified_type (type, type_quals);
4733 type = build_pointer_type (type);
4734 type_quals = TYPE_UNQUALIFIED;
4736 else if (type_quals)
4737 type = c_build_qualified_type (type, type_quals);
4739 type_as_written = type;
4741 decl = build_decl (PARM_DECL, declarator->u.id, type);
4743 C_DECL_VARIABLE_SIZE (decl) = 1;
4745 /* Compute the type actually passed in the parmlist,
4746 for the case where there is no prototype.
4747 (For example, shorts and chars are passed as ints.)
4748 When there is a prototype, this is overridden later. */
4750 if (type == error_mark_node)
4751 promoted_type = type;
4753 promoted_type = c_type_promotes_to (type);
4755 DECL_ARG_TYPE (decl) = promoted_type;
4756 if (declspecs->inline_p)
4757 pedwarn ("parameter %q+D declared %<inline%>", decl);
4759 else if (decl_context == FIELD)
4761 /* Note that the grammar rejects storage classes in typenames
4763 gcc_assert (storage_class == csc_none && !threadp
4764 && !declspecs->inline_p);
4766 /* Structure field. It may not be a function. */
4768 if (TREE_CODE (type) == FUNCTION_TYPE)
4770 error ("field %qs declared as a function", name);
4771 type = build_pointer_type (type);
4773 else if (TREE_CODE (type) != ERROR_MARK
4774 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4776 error ("field %qs has incomplete type", name);
4777 type = error_mark_node;
4779 type = c_build_qualified_type (type, type_quals);
4780 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4781 DECL_NONADDRESSABLE_P (decl) = bitfield;
4782 if (bitfield && !declarator->u.id)
4783 TREE_NO_WARNING (decl) = 1;
4786 C_DECL_VARIABLE_SIZE (decl) = 1;
4788 else if (TREE_CODE (type) == FUNCTION_TYPE)
4790 if (storage_class == csc_register || threadp)
4792 error ("invalid storage class for function %qs", name);
4794 else if (current_scope != file_scope)
4796 /* Function declaration not at file scope. Storage
4797 classes other than `extern' are not allowed, C99
4798 6.7.1p5, and `extern' makes no difference. However,
4799 GCC allows 'auto', perhaps with 'inline', to support
4800 nested functions. */
4801 if (storage_class == csc_auto)
4804 pedwarn ("invalid storage class for function %qs", name);
4806 else if (storage_class == csc_static)
4808 error ("invalid storage class for function %qs", name);
4810 storage_class = declspecs->storage_class = csc_none;
4816 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4817 decl = build_decl_attribute_variant (decl, decl_attr);
4819 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4821 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4822 pedwarn ("ISO C forbids qualified function types");
4824 /* GNU C interprets a volatile-qualified function type to indicate
4825 that the function does not return. */
4826 if ((type_quals & TYPE_QUAL_VOLATILE)
4827 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4828 warning (0, "%<noreturn%> function returns non-void value");
4830 /* Every function declaration is an external reference
4831 (DECL_EXTERNAL) except for those which are not at file
4832 scope and are explicitly declared "auto". This is
4833 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4834 GCC to signify a forward declaration of a nested function. */
4835 if (storage_class == csc_auto && current_scope != file_scope)
4836 DECL_EXTERNAL (decl) = 0;
4837 /* In C99, a function which is declared 'inline' with 'extern'
4838 is not an external reference (which is confusing). It
4839 means that the later definition of the function must be output
4840 in this file, C99 6.7.4p6. In GNU C89, a function declared
4841 'extern inline' is an external reference. */
4842 else if (declspecs->inline_p && storage_class != csc_static)
4843 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
4844 == flag_gnu89_inline);
4846 DECL_EXTERNAL (decl) = !initialized;
4848 /* Record absence of global scope for `static' or `auto'. */
4850 = !(storage_class == csc_static || storage_class == csc_auto);
4852 /* For a function definition, record the argument information
4853 block where store_parm_decls will look for it. */
4855 current_function_arg_info = arg_info;
4857 if (declspecs->default_int_p)
4858 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4860 /* Record presence of `inline', if it is reasonable. */
4861 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4863 if (declspecs->inline_p)
4864 pedwarn ("cannot inline function %<main%>");
4866 else if (declspecs->inline_p)
4868 /* Record that the function is declared `inline'. */
4869 DECL_DECLARED_INLINE_P (decl) = 1;
4871 /* Do not mark bare declarations as DECL_INLINE. Doing so
4872 in the presence of multiple declarations can result in
4873 the abstract origin pointing between the declarations,
4874 which will confuse dwarf2out. */
4876 DECL_INLINE (decl) = 1;
4878 /* If -finline-functions, assume it can be inlined. This does
4879 two things: let the function be deferred until it is actually
4880 needed, and let dwarf2 know that the function is inlinable. */
4881 else if (flag_inline_trees == 2 && initialized)
4882 DECL_INLINE (decl) = 1;
4886 /* It's a variable. */
4887 /* An uninitialized decl with `extern' is a reference. */
4888 int extern_ref = !initialized && storage_class == csc_extern;
4890 type = c_build_qualified_type (type, type_quals);
4892 /* C99 6.2.2p7: It is invalid (compile-time undefined
4893 behavior) to create an 'extern' declaration for a
4894 variable if there is a global declaration that is
4895 'static' and the global declaration is not visible.
4896 (If the static declaration _is_ currently visible,
4897 the 'extern' declaration is taken to refer to that decl.) */
4898 if (extern_ref && current_scope != file_scope)
4900 tree global_decl = identifier_global_value (declarator->u.id);
4901 tree visible_decl = lookup_name (declarator->u.id);
4904 && global_decl != visible_decl
4905 && TREE_CODE (global_decl) == VAR_DECL
4906 && !TREE_PUBLIC (global_decl))
4907 error ("variable previously declared %<static%> redeclared "
4911 decl = build_decl (VAR_DECL, declarator->u.id, type);
4912 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4914 C_DECL_VARIABLE_SIZE (decl) = 1;
4916 if (declspecs->inline_p)
4917 pedwarn ("variable %q+D declared %<inline%>", decl);
4919 /* At file scope, an initialized extern declaration may follow
4920 a static declaration. In that case, DECL_EXTERNAL will be
4921 reset later in start_decl. */
4922 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4924 /* At file scope, the presence of a `static' or `register' storage
4925 class specifier, or the absence of all storage class specifiers
4926 makes this declaration a definition (perhaps tentative). Also,
4927 the absence of `static' makes it public. */
4928 if (current_scope == file_scope)
4930 TREE_PUBLIC (decl) = storage_class != csc_static;
4931 TREE_STATIC (decl) = !extern_ref;
4933 /* Not at file scope, only `static' makes a static definition. */
4936 TREE_STATIC (decl) = (storage_class == csc_static);
4937 TREE_PUBLIC (decl) = extern_ref;
4941 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4944 if (storage_class == csc_extern
4945 && variably_modified_type_p (type, NULL_TREE))
4948 error ("object with variably modified type must have no linkage");
4951 /* Record `register' declaration for warnings on &
4952 and in case doing stupid register allocation. */
4954 if (storage_class == csc_register)
4956 C_DECL_REGISTER (decl) = 1;
4957 DECL_REGISTER (decl) = 1;
4960 /* Record constancy and volatility. */
4961 c_apply_type_quals_to_decl (type_quals, decl);
4963 /* If a type has volatile components, it should be stored in memory.
4964 Otherwise, the fact that those components are volatile
4965 will be ignored, and would even crash the compiler.
4966 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4967 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4968 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4969 || TREE_CODE (decl) == RESULT_DECL))
4971 /* It is not an error for a structure with volatile fields to
4972 be declared register, but reset DECL_REGISTER since it
4973 cannot actually go in a register. */
4974 int was_reg = C_DECL_REGISTER (decl);
4975 C_DECL_REGISTER (decl) = 0;
4976 DECL_REGISTER (decl) = 0;
4977 c_mark_addressable (decl);
4978 C_DECL_REGISTER (decl) = was_reg;
4981 /* This is the earliest point at which we might know the assembler
4982 name of a variable. Thus, if it's known before this, die horribly. */
4983 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4985 decl_attributes (&decl, returned_attrs, 0);
4991 /* Decode the parameter-list info for a function type or function definition.
4992 The argument is the value returned by `get_parm_info' (or made in c-parse.c
4993 if there is an identifier list instead of a parameter decl list).
4994 These two functions are separate because when a function returns
4995 or receives functions then each is called multiple times but the order
4996 of calls is different. The last call to `grokparms' is always the one
4997 that contains the formal parameter names of a function definition.
4999 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5001 FUNCDEF_FLAG is true for a function definition, false for
5002 a mere declaration. A nonempty identifier-list gets an error message
5003 when FUNCDEF_FLAG is false. */
5006 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
5008 tree arg_types = arg_info->types;
5010 if (funcdef_flag && arg_info->had_vla_unspec)
5012 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5014 error ("%<[*]%> not allowed in other than function prototype scope");
5017 if (arg_types == 0 && !funcdef_flag && !in_system_header)
5018 warning (OPT_Wstrict_prototypes,
5019 "function declaration isn%'t a prototype");
5021 if (arg_types == error_mark_node)
5022 return 0; /* don't set TYPE_ARG_TYPES in this case */
5024 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
5027 pedwarn ("parameter names (without types) in function declaration");
5029 arg_info->parms = arg_info->types;
5030 arg_info->types = 0;
5035 tree parm, type, typelt;
5036 unsigned int parmno;
5038 /* If there is a parameter of incomplete type in a definition,
5039 this is an error. In a declaration this is valid, and a
5040 struct or union type may be completed later, before any calls
5041 or definition of the function. In the case where the tag was
5042 first declared within the parameter list, a warning has
5043 already been given. If a parameter has void type, then
5044 however the function cannot be defined or called, so
5047 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
5049 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
5051 type = TREE_VALUE (typelt);
5052 if (type == error_mark_node)
5055 if (!COMPLETE_TYPE_P (type))
5059 if (DECL_NAME (parm))
5060 error ("parameter %u (%q+D) has incomplete type",
5063 error ("%Jparameter %u has incomplete type",
5066 TREE_VALUE (typelt) = error_mark_node;
5067 TREE_TYPE (parm) = error_mark_node;
5069 else if (VOID_TYPE_P (type))
5071 if (DECL_NAME (parm))
5072 warning (0, "parameter %u (%q+D) has void type",
5075 warning (0, "%Jparameter %u has void type",
5080 if (DECL_NAME (parm) && TREE_USED (parm))
5081 warn_if_shadowing (parm);
5087 /* Take apart the current scope and return a c_arg_info structure with
5088 info on a parameter list just parsed.
5090 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5092 ELLIPSIS being true means the argument list ended in '...' so don't
5093 append a sentinel (void_list_node) to the end of the type-list. */
5096 get_parm_info (bool ellipsis)
5098 struct c_binding *b = current_scope->bindings;
5099 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
5106 static bool explained_incomplete_types = false;
5107 bool gave_void_only_once_err = false;
5109 arg_info->parms = 0;
5111 arg_info->types = 0;
5112 arg_info->others = 0;
5113 arg_info->pending_sizes = 0;
5114 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
5116 /* The bindings in this scope must not get put into a block.
5117 We will take care of deleting the binding nodes. */
5118 current_scope->bindings = 0;
5120 /* This function is only called if there was *something* on the
5124 /* A parameter list consisting solely of 'void' indicates that the
5125 function takes no arguments. But if the 'void' is qualified
5126 (by 'const' or 'volatile'), or has a storage class specifier
5127 ('register'), then the behavior is undefined; issue an error.
5128 Typedefs for 'void' are OK (see DR#157). */
5129 if (b->prev == 0 /* one binding */
5130 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
5131 && !DECL_NAME (b->decl) /* anonymous */
5132 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
5134 if (TREE_THIS_VOLATILE (b->decl)
5135 || TREE_READONLY (b->decl)
5136 || C_DECL_REGISTER (b->decl))
5137 error ("%<void%> as only parameter may not be qualified");
5139 /* There cannot be an ellipsis. */
5141 error ("%<void%> must be the only parameter");
5143 arg_info->types = void_list_node;
5148 types = void_list_node;
5150 /* Break up the bindings list into parms, tags, types, and others;
5151 apply sanity checks; purge the name-to-decl bindings. */
5154 tree decl = b->decl;
5155 tree type = TREE_TYPE (decl);
5156 const char *keyword;
5158 switch (TREE_CODE (decl))
5163 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5164 I_SYMBOL_BINDING (b->id) = b->shadowed;
5167 /* Check for forward decls that never got their actual decl. */
5168 if (TREE_ASM_WRITTEN (decl))
5169 error ("parameter %q+D has just a forward declaration", decl);
5170 /* Check for (..., void, ...) and issue an error. */
5171 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
5173 if (!gave_void_only_once_err)
5175 error ("%<void%> must be the only parameter");
5176 gave_void_only_once_err = true;
5181 /* Valid parameter, add it to the list. */
5182 TREE_CHAIN (decl) = parms;
5185 /* Since there is a prototype, args are passed in their
5186 declared types. The back end may override this later. */
5187 DECL_ARG_TYPE (decl) = type;
5188 types = tree_cons (0, type, types);
5192 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
5193 case UNION_TYPE: keyword = "union"; goto tag;
5194 case RECORD_TYPE: keyword = "struct"; goto tag;
5196 /* Types may not have tag-names, in which case the type
5197 appears in the bindings list with b->id NULL. */
5200 gcc_assert (I_TAG_BINDING (b->id) == b);
5201 I_TAG_BINDING (b->id) = b->shadowed;
5204 /* Warn about any struct, union or enum tags defined in a
5205 parameter list. The scope of such types is limited to
5206 the parameter list, which is rarely if ever desirable
5207 (it's impossible to call such a function with type-
5208 correct arguments). An anonymous union parm type is
5209 meaningful as a GNU extension, so don't warn for that. */
5210 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
5213 /* The %s will be one of 'struct', 'union', or 'enum'. */
5214 warning (0, "%<%s %E%> declared inside parameter list",
5217 /* The %s will be one of 'struct', 'union', or 'enum'. */
5218 warning (0, "anonymous %s declared inside parameter list",
5221 if (!explained_incomplete_types)
5223 warning (0, "its scope is only this definition or declaration,"
5224 " which is probably not what you want");
5225 explained_incomplete_types = true;
5229 tags = tree_cons (b->id, decl, tags);
5235 /* CONST_DECLs appear here when we have an embedded enum,
5236 and TYPE_DECLs appear here when we have an embedded struct
5237 or union. No warnings for this - we already warned about the
5238 type itself. FUNCTION_DECLs appear when there is an implicit
5239 function declaration in the parameter list. */
5241 TREE_CHAIN (decl) = others;
5246 /* error_mark_node appears here when we have an undeclared
5247 variable. Just throw it away. */
5250 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5251 I_SYMBOL_BINDING (b->id) = b->shadowed;
5255 /* Other things that might be encountered. */
5262 b = free_binding_and_advance (b);
5265 arg_info->parms = parms;
5266 arg_info->tags = tags;
5267 arg_info->types = types;
5268 arg_info->others = others;
5269 arg_info->pending_sizes = get_pending_sizes ();
5273 /* Get the struct, enum or union (CODE says which) with tag NAME.
5274 Define the tag as a forward-reference if it is not defined.
5275 Return a c_typespec structure for the type specifier. */
5278 parser_xref_tag (enum tree_code code, tree name)
5280 struct c_typespec ret;
5281 /* If a cross reference is requested, look up the type
5282 already defined for this tag and return it. */
5284 tree ref = lookup_tag (code, name, 0);
5285 /* If this is the right type of tag, return what we found.
5286 (This reference will be shadowed by shadow_tag later if appropriate.)
5287 If this is the wrong type of tag, do not return it. If it was the
5288 wrong type in the same scope, we will have had an error
5289 message already; if in a different scope and declaring
5290 a name, pending_xref_error will give an error message; but if in a
5291 different scope and not declaring a name, this tag should
5292 shadow the previous declaration of a different type of tag, and
5293 this would not work properly if we return the reference found.
5294 (For example, with "struct foo" in an outer scope, "union foo;"
5295 must shadow that tag with a new one of union type.) */
5296 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5297 if (ref && TREE_CODE (ref) == code)
5303 /* If no such tag is yet defined, create a forward-reference node
5304 and record it as the "definition".
5305 When a real declaration of this type is found,
5306 the forward-reference will be altered into a real type. */
5308 ref = make_node (code);
5309 if (code == ENUMERAL_TYPE)
5311 /* Give the type a default layout like unsigned int
5312 to avoid crashing if it does not get defined. */
5313 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5314 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5315 TYPE_USER_ALIGN (ref) = 0;
5316 TYPE_UNSIGNED (ref) = 1;
5317 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5318 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5319 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5322 pushtag (name, ref);
5328 /* Get the struct, enum or union (CODE says which) with tag NAME.
5329 Define the tag as a forward-reference if it is not defined.
5330 Return a tree for the type. */
5333 xref_tag (enum tree_code code, tree name)
5335 return parser_xref_tag (code, name).spec;
5338 /* Make sure that the tag NAME is defined *in the current scope*
5339 at least as a forward reference.
5340 CODE says which kind of tag NAME ought to be. */
5343 start_struct (enum tree_code code, tree name)
5345 /* If there is already a tag defined at this scope
5346 (as a forward reference), just return it. */
5351 ref = lookup_tag (code, name, 1);
5352 if (ref && TREE_CODE (ref) == code)
5354 if (TYPE_SIZE (ref))
5356 if (code == UNION_TYPE)
5357 error ("redefinition of %<union %E%>", name);
5359 error ("redefinition of %<struct %E%>", name);
5361 else if (C_TYPE_BEING_DEFINED (ref))
5363 if (code == UNION_TYPE)
5364 error ("nested redefinition of %<union %E%>", name);
5366 error ("nested redefinition of %<struct %E%>", name);
5367 /* Don't create structures that contain themselves. */
5372 /* Otherwise create a forward-reference just so the tag is in scope. */
5374 if (ref == NULL_TREE || TREE_CODE (ref) != code)
5376 ref = make_node (code);
5377 pushtag (name, ref);
5380 C_TYPE_BEING_DEFINED (ref) = 1;
5381 TYPE_PACKED (ref) = flag_pack_struct;
5385 /* Process the specs, declarator and width (NULL if omitted)
5386 of a structure component, returning a FIELD_DECL node.
5387 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5389 This is done during the parsing of the struct declaration.
5390 The FIELD_DECL nodes are chained together and the lot of them
5391 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5394 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5399 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5400 && width == NULL_TREE)
5402 /* This is an unnamed decl.
5404 If we have something of the form "union { list } ;" then this
5405 is the anonymous union extension. Similarly for struct.
5407 If this is something of the form "struct foo;", then
5408 If MS extensions are enabled, this is handled as an
5410 Otherwise this is a forward declaration of a structure tag.
5412 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5413 If MS extensions are enabled and foo names a structure, then
5414 again this is an anonymous struct.
5415 Otherwise this is an error.
5417 Oh what a horrid tangled web we weave. I wonder if MS consciously
5418 took this from Plan 9 or if it was an accident of implementation
5419 that took root before someone noticed the bug... */
5421 tree type = declspecs->type;
5422 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5423 || TREE_CODE (type) == UNION_TYPE);
5427 && (flag_ms_extensions || !declspecs->typedef_p))
5429 if (flag_ms_extensions)
5433 else if (TYPE_NAME (type) == NULL)
5440 pedwarn ("declaration does not declare anything");
5444 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5447 value = grokdeclarator (declarator, declspecs, FIELD, false,
5448 width ? &width : NULL);
5450 finish_decl (value, NULL_TREE, NULL_TREE);
5451 DECL_INITIAL (value) = width;
5456 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5457 the list such that this does not present a problem later. */
5460 detect_field_duplicates (tree fieldlist)
5465 /* First, see if there are more than "a few" fields.
5466 This is trivially true if there are zero or one fields. */
5469 x = TREE_CHAIN (fieldlist);
5475 } while (timeout > 0 && x);
5477 /* If there were "few" fields, avoid the overhead of allocating
5478 a hash table. Instead just do the nested traversal thing. */
5481 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5484 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5485 if (DECL_NAME (y) == DECL_NAME (x))
5487 error ("duplicate member %q+D", x);
5488 DECL_NAME (x) = NULL_TREE;
5494 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5497 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5498 if ((y = DECL_NAME (x)) != 0)
5500 slot = htab_find_slot (htab, y, INSERT);
5503 error ("duplicate member %q+D", x);
5504 DECL_NAME (x) = NULL_TREE;
5513 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5514 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5515 ATTRIBUTES are attributes to be applied to the structure. */
5518 finish_struct (tree t, tree fieldlist, tree attributes)
5521 bool toplevel = file_scope == current_scope;
5522 int saw_named_field;
5524 /* If this type was previously laid out as a forward reference,
5525 make sure we lay it out again. */
5529 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5533 for (x = fieldlist; x; x = TREE_CHAIN (x))
5534 if (DECL_NAME (x) != 0)
5539 if (TREE_CODE (t) == UNION_TYPE)
5542 pedwarn ("union has no named members");
5544 pedwarn ("union has no members");
5549 pedwarn ("struct has no named members");
5551 pedwarn ("struct has no members");
5556 /* Install struct as DECL_CONTEXT of each field decl.
5557 Also process specified field sizes, found in the DECL_INITIAL,
5558 storing 0 there after the type has been changed to precision equal
5559 to its width, rather than the precision of the specified standard
5560 type. (Correct layout requires the original type to have been preserved
5563 saw_named_field = 0;
5564 for (x = fieldlist; x; x = TREE_CHAIN (x))
5566 if (TREE_TYPE (x) == error_mark_node)
5569 DECL_CONTEXT (x) = t;
5571 if (TYPE_PACKED (t) && TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)
5572 DECL_PACKED (x) = 1;
5574 /* If any field is const, the structure type is pseudo-const. */
5575 if (TREE_READONLY (x))
5576 C_TYPE_FIELDS_READONLY (t) = 1;
5579 /* A field that is pseudo-const makes the structure likewise. */
5580 tree t1 = TREE_TYPE (x);
5581 while (TREE_CODE (t1) == ARRAY_TYPE)
5582 t1 = TREE_TYPE (t1);
5583 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5584 && C_TYPE_FIELDS_READONLY (t1))
5585 C_TYPE_FIELDS_READONLY (t) = 1;
5588 /* Any field that is volatile means variables of this type must be
5589 treated in some ways as volatile. */
5590 if (TREE_THIS_VOLATILE (x))
5591 C_TYPE_FIELDS_VOLATILE (t) = 1;
5593 /* Any field of nominal variable size implies structure is too. */
5594 if (C_DECL_VARIABLE_SIZE (x))
5595 C_TYPE_VARIABLE_SIZE (t) = 1;
5597 if (DECL_INITIAL (x))
5599 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5600 DECL_SIZE (x) = bitsize_int (width);
5601 DECL_BIT_FIELD (x) = 1;
5602 SET_DECL_C_BIT_FIELD (x);
5605 /* Detect flexible array member in an invalid context. */
5606 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5607 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5608 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5609 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5611 if (TREE_CODE (t) == UNION_TYPE)
5613 error ("%Jflexible array member in union", x);
5614 TREE_TYPE (x) = error_mark_node;
5616 else if (TREE_CHAIN (x) != NULL_TREE)
5618 error ("%Jflexible array member not at end of struct", x);
5619 TREE_TYPE (x) = error_mark_node;
5621 else if (!saw_named_field)
5623 error ("%Jflexible array member in otherwise empty struct", x);
5624 TREE_TYPE (x) = error_mark_node;
5628 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5629 && flexible_array_type_p (TREE_TYPE (x)))
5630 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5633 saw_named_field = 1;
5636 detect_field_duplicates (fieldlist);
5638 /* Now we have the nearly final fieldlist. Record it,
5639 then lay out the structure or union (including the fields). */
5641 TYPE_FIELDS (t) = fieldlist;
5645 /* Give bit-fields their proper types. */
5647 tree *fieldlistp = &fieldlist;
5649 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5650 && TREE_TYPE (*fieldlistp) != error_mark_node)
5652 unsigned HOST_WIDE_INT width
5653 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5654 tree type = TREE_TYPE (*fieldlistp);
5655 if (width != TYPE_PRECISION (type))
5657 TREE_TYPE (*fieldlistp)
5658 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5659 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5661 DECL_INITIAL (*fieldlistp) = 0;
5664 fieldlistp = &TREE_CHAIN (*fieldlistp);
5667 /* Now we have the truly final field list.
5668 Store it in this type and in the variants. */
5670 TYPE_FIELDS (t) = fieldlist;
5672 /* If there are lots of fields, sort so we can look through them fast.
5673 We arbitrarily consider 16 or more elts to be "a lot". */
5678 for (x = fieldlist; x; x = TREE_CHAIN (x))
5680 if (len > 15 || DECL_NAME (x) == NULL)
5688 struct lang_type *space;
5689 struct sorted_fields_type *space2;
5691 len += list_length (x);
5693 /* Use the same allocation policy here that make_node uses, to
5694 ensure that this lives as long as the rest of the struct decl.
5695 All decls in an inline function need to be saved. */
5697 space = GGC_CNEW (struct lang_type);
5698 space2 = GGC_NEWVAR (struct sorted_fields_type,
5699 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5703 field_array = &space2->elts[0];
5704 for (x = fieldlist; x; x = TREE_CHAIN (x))
5706 field_array[len++] = x;
5708 /* If there is anonymous struct or union, break out of the loop. */
5709 if (DECL_NAME (x) == NULL)
5712 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5715 TYPE_LANG_SPECIFIC (t) = space;
5716 TYPE_LANG_SPECIFIC (t)->s->len = len;
5717 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5718 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5723 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5725 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5726 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5727 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5728 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5729 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5732 /* If this was supposed to be a transparent union, but we can't
5733 make it one, warn and turn off the flag. */
5734 if (TREE_CODE (t) == UNION_TYPE
5735 && TYPE_TRANSPARENT_UNION (t)
5736 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5738 TYPE_TRANSPARENT_UNION (t) = 0;
5739 warning (0, "union cannot be made transparent");
5742 /* If this structure or union completes the type of any previous
5743 variable declaration, lay it out and output its rtl. */
5744 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5748 tree decl = TREE_VALUE (x);
5749 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5750 layout_array_type (TREE_TYPE (decl));
5751 if (TREE_CODE (decl) != TYPE_DECL)
5753 layout_decl (decl, 0);
5754 if (c_dialect_objc ())
5755 objc_check_decl (decl);
5756 rest_of_decl_compilation (decl, toplevel, 0);
5761 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5763 /* Finish debugging output for this type. */
5764 rest_of_type_compilation (t, toplevel);
5766 /* If we're inside a function proper, i.e. not file-scope and not still
5767 parsing parameters, then arrange for the size of a variable sized type
5769 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
5770 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5775 /* Lay out the type T, and its element type, and so on. */
5778 layout_array_type (tree t)
5780 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5781 layout_array_type (TREE_TYPE (t));
5785 /* Begin compiling the definition of an enumeration type.
5786 NAME is its name (or null if anonymous).
5787 Returns the type object, as yet incomplete.
5788 Also records info about it so that build_enumerator
5789 may be used to declare the individual values as they are read. */
5792 start_enum (struct c_enum_contents *the_enum, tree name)
5796 /* If this is the real definition for a previous forward reference,
5797 fill in the contents in the same object that used to be the
5798 forward reference. */
5801 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5803 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5805 enumtype = make_node (ENUMERAL_TYPE);
5806 pushtag (name, enumtype);
5809 if (C_TYPE_BEING_DEFINED (enumtype))
5810 error ("nested redefinition of %<enum %E%>", name);
5812 C_TYPE_BEING_DEFINED (enumtype) = 1;
5814 if (TYPE_VALUES (enumtype) != 0)
5816 /* This enum is a named one that has been declared already. */
5817 error ("redeclaration of %<enum %E%>", name);
5819 /* Completely replace its old definition.
5820 The old enumerators remain defined, however. */
5821 TYPE_VALUES (enumtype) = 0;
5824 the_enum->enum_next_value = integer_zero_node;
5825 the_enum->enum_overflow = 0;
5827 if (flag_short_enums)
5828 TYPE_PACKED (enumtype) = 1;
5833 /* After processing and defining all the values of an enumeration type,
5834 install their decls in the enumeration type and finish it off.
5835 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5836 and ATTRIBUTES are the specified attributes.
5837 Returns ENUMTYPE. */
5840 finish_enum (tree enumtype, tree values, tree attributes)
5843 tree minnode = 0, maxnode = 0;
5844 int precision, unsign;
5845 bool toplevel = (file_scope == current_scope);
5846 struct lang_type *lt;
5848 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5850 /* Calculate the maximum value of any enumerator in this type. */
5852 if (values == error_mark_node)
5853 minnode = maxnode = integer_zero_node;
5856 minnode = maxnode = TREE_VALUE (values);
5857 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5859 tree value = TREE_VALUE (pair);
5860 if (tree_int_cst_lt (maxnode, value))
5862 if (tree_int_cst_lt (value, minnode))
5867 /* Construct the final type of this enumeration. It is the same
5868 as one of the integral types - the narrowest one that fits, except
5869 that normally we only go as narrow as int - and signed iff any of
5870 the values are negative. */
5871 unsign = (tree_int_cst_sgn (minnode) >= 0);
5872 precision = MAX (min_precision (minnode, unsign),
5873 min_precision (maxnode, unsign));
5875 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5877 tem = c_common_type_for_size (precision, unsign);
5880 warning (0, "enumeration values exceed range of largest integer");
5881 tem = long_long_integer_type_node;
5885 tem = unsign ? unsigned_type_node : integer_type_node;
5887 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5888 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5889 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5890 TYPE_SIZE (enumtype) = 0;
5892 /* If the precision of the type was specific with an attribute and it
5893 was too small, give an error. Otherwise, use it. */
5894 if (TYPE_PRECISION (enumtype))
5896 if (precision > TYPE_PRECISION (enumtype))
5897 error ("specified mode too small for enumeral values");
5900 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5902 layout_type (enumtype);
5904 if (values != error_mark_node)
5906 /* Change the type of the enumerators to be the enum type. We
5907 need to do this irrespective of the size of the enum, for
5908 proper type checking. Replace the DECL_INITIALs of the
5909 enumerators, and the value slots of the list, with copies
5910 that have the enum type; they cannot be modified in place
5911 because they may be shared (e.g. integer_zero_node) Finally,
5912 change the purpose slots to point to the names of the decls. */
5913 for (pair = values; pair; pair = TREE_CHAIN (pair))
5915 tree enu = TREE_PURPOSE (pair);
5916 tree ini = DECL_INITIAL (enu);
5918 TREE_TYPE (enu) = enumtype;
5920 /* The ISO C Standard mandates enumerators to have type int,
5921 even though the underlying type of an enum type is
5922 unspecified. Here we convert any enumerators that fit in
5923 an int to type int, to avoid promotions to unsigned types
5924 when comparing integers with enumerators that fit in the
5925 int range. When -pedantic is given, build_enumerator()
5926 would have already taken care of those that don't fit. */
5927 if (int_fits_type_p (ini, integer_type_node))
5928 tem = integer_type_node;
5931 ini = convert (tem, ini);
5933 DECL_INITIAL (enu) = ini;
5934 TREE_PURPOSE (pair) = DECL_NAME (enu);
5935 TREE_VALUE (pair) = ini;
5938 TYPE_VALUES (enumtype) = values;
5941 /* Record the min/max values so that we can warn about bit-field
5942 enumerations that are too small for the values. */
5943 lt = GGC_CNEW (struct lang_type);
5944 lt->enum_min = minnode;
5945 lt->enum_max = maxnode;
5946 TYPE_LANG_SPECIFIC (enumtype) = lt;
5948 /* Fix up all variant types of this enum type. */
5949 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5951 if (tem == enumtype)
5953 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5954 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5955 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5956 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5957 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5958 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5959 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5960 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5961 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5962 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5963 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5966 /* Finish debugging output for this type. */
5967 rest_of_type_compilation (enumtype, toplevel);
5972 /* Build and install a CONST_DECL for one value of the
5973 current enumeration type (one that was begun with start_enum).
5974 Return a tree-list containing the CONST_DECL and its value.
5975 Assignment of sequential values by default is handled here. */
5978 build_enumerator (struct c_enum_contents *the_enum, tree name, tree value)
5982 /* Validate and default VALUE. */
5986 /* Don't issue more errors for error_mark_node (i.e. an
5987 undeclared identifier) - just ignore the value expression. */
5988 if (value == error_mark_node)
5990 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5991 || TREE_CODE (value) != INTEGER_CST)
5993 error ("enumerator value for %qE is not an integer constant", name);
5998 value = default_conversion (value);
5999 constant_expression_warning (value);
6003 /* Default based on previous value. */
6004 /* It should no longer be possible to have NON_LVALUE_EXPR
6008 value = the_enum->enum_next_value;
6009 if (the_enum->enum_overflow)
6010 error ("overflow in enumeration values");
6013 if (pedantic && !int_fits_type_p (value, integer_type_node))
6015 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
6016 /* XXX This causes -pedantic to change the meaning of the program.
6017 Remove? -zw 2004-03-15 */
6018 value = convert (integer_type_node, value);
6021 /* Set basis for default for next value. */
6022 the_enum->enum_next_value = build_binary_op (PLUS_EXPR, value,
6023 integer_one_node, 0);
6024 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
6026 /* Now create a declaration for the enum value name. */
6028 type = TREE_TYPE (value);
6029 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
6030 TYPE_PRECISION (integer_type_node)),
6031 (TYPE_PRECISION (type)
6032 >= TYPE_PRECISION (integer_type_node)
6033 && TYPE_UNSIGNED (type)));
6035 decl = build_decl (CONST_DECL, name, type);
6036 DECL_INITIAL (decl) = convert (type, value);
6039 return tree_cons (decl, value, NULL_TREE);
6043 /* Create the FUNCTION_DECL for a function definition.
6044 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6045 the declaration; they describe the function's name and the type it returns,
6046 but twisted together in a fashion that parallels the syntax of C.
6048 This function creates a binding context for the function body
6049 as well as setting up the FUNCTION_DECL in current_function_decl.
6051 Returns 1 on success. If the DECLARATOR is not suitable for a function
6052 (it defines a datum instead), we return 0, which tells
6053 yyparse to report a parse error. */
6056 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
6059 tree decl1, old_decl;
6060 tree restype, resdecl;
6061 struct c_label_context_se *nstack_se;
6062 struct c_label_context_vm *nstack_vm;
6064 current_function_returns_value = 0; /* Assume, until we see it does. */
6065 current_function_returns_null = 0;
6066 current_function_returns_abnormally = 0;
6067 warn_about_return_type = 0;
6068 c_switch_stack = NULL;
6070 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
6071 nstack_se->labels_def = NULL;
6072 nstack_se->labels_used = NULL;
6073 nstack_se->next = label_context_stack_se;
6074 label_context_stack_se = nstack_se;
6076 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
6077 nstack_vm->labels_def = NULL;
6078 nstack_vm->labels_used = NULL;
6079 nstack_vm->scope = 0;
6080 nstack_vm->next = label_context_stack_vm;
6081 label_context_stack_vm = nstack_vm;
6083 /* Indicate no valid break/continue context by setting these variables
6084 to some non-null, non-label value. We'll notice and emit the proper
6085 error message in c_finish_bc_stmt. */
6086 c_break_label = c_cont_label = size_zero_node;
6088 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
6090 /* If the declarator is not suitable for a function definition,
6091 cause a syntax error. */
6094 label_context_stack_se = label_context_stack_se->next;
6095 label_context_stack_vm = label_context_stack_vm->next;
6099 decl_attributes (&decl1, attributes, 0);
6101 if (DECL_DECLARED_INLINE_P (decl1)
6102 && DECL_UNINLINABLE (decl1)
6103 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6104 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
6107 /* Handle gnu_inline attribute. */
6108 if (declspecs->inline_p
6109 && !flag_gnu89_inline
6110 && TREE_CODE (decl1) == FUNCTION_DECL
6111 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1)))
6113 if (declspecs->storage_class != csc_static)
6114 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
6117 announce_function (decl1);
6119 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6121 error ("return type is an incomplete type");
6122 /* Make it return void instead. */
6124 = build_function_type (void_type_node,
6125 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6128 if (warn_about_return_type)
6129 pedwarn_c99 ("return type defaults to %<int%>");
6131 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6132 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6133 DECL_INITIAL (decl1) = error_mark_node;
6135 /* If this definition isn't a prototype and we had a prototype declaration
6136 before, copy the arg type info from that prototype. */
6137 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
6138 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
6140 current_function_prototype_locus = UNKNOWN_LOCATION;
6141 current_function_prototype_built_in = false;
6142 current_function_prototype_arg_types = NULL_TREE;
6143 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6145 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6146 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6147 TREE_TYPE (TREE_TYPE (old_decl))))
6149 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
6151 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
6152 current_function_prototype_built_in
6153 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
6154 current_function_prototype_arg_types
6155 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
6157 if (TREE_PUBLIC (decl1))
6159 /* If there is an external prototype declaration of this
6160 function, record its location but do not copy information
6161 to this decl. This may be an invisible declaration
6162 (built-in or in a scope which has finished) or simply
6163 have more refined argument types than any declaration
6165 struct c_binding *b;
6166 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
6167 if (B_IN_SCOPE (b, external_scope))
6171 tree ext_decl, ext_type;
6173 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
6174 if (TREE_CODE (ext_type) == FUNCTION_TYPE
6175 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6176 TREE_TYPE (ext_type)))
6178 current_function_prototype_locus
6179 = DECL_SOURCE_LOCATION (ext_decl);
6180 current_function_prototype_built_in
6181 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
6182 current_function_prototype_arg_types
6183 = TYPE_ARG_TYPES (ext_type);
6189 /* Optionally warn of old-fashioned def with no previous prototype. */
6190 if (warn_strict_prototypes
6191 && old_decl != error_mark_node
6192 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6193 && C_DECL_ISNT_PROTOTYPE (old_decl))
6194 warning (OPT_Wstrict_prototypes,
6195 "function declaration isn%'t a prototype");
6196 /* Optionally warn of any global def with no previous prototype. */
6197 else if (warn_missing_prototypes
6198 && old_decl != error_mark_node
6199 && TREE_PUBLIC (decl1)
6200 && !MAIN_NAME_P (DECL_NAME (decl1))
6201 && C_DECL_ISNT_PROTOTYPE (old_decl))
6202 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
6203 /* Optionally warn of any def with no previous prototype
6204 if the function has already been used. */
6205 else if (warn_missing_prototypes
6207 && old_decl != error_mark_node
6208 && TREE_USED (old_decl)
6209 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6210 warning (OPT_Wmissing_prototypes,
6211 "%q+D was used with no prototype before its definition", decl1);
6212 /* Optionally warn of any global def with no previous declaration. */
6213 else if (warn_missing_declarations
6214 && TREE_PUBLIC (decl1)
6216 && !MAIN_NAME_P (DECL_NAME (decl1)))
6217 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
6219 /* Optionally warn of any def with no previous declaration
6220 if the function has already been used. */
6221 else if (warn_missing_declarations
6223 && old_decl != error_mark_node
6224 && TREE_USED (old_decl)
6225 && C_DECL_IMPLICIT (old_decl))
6226 warning (OPT_Wmissing_declarations,
6227 "%q+D was used with no declaration before its definition", decl1);
6229 /* This function exists in static storage.
6230 (This does not mean `static' in the C sense!) */
6231 TREE_STATIC (decl1) = 1;
6233 /* A nested function is not global. */
6234 if (current_function_decl != 0)
6235 TREE_PUBLIC (decl1) = 0;
6237 /* This is the earliest point at which we might know the assembler
6238 name of the function. Thus, if it's set before this, die horribly. */
6239 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
6241 /* If #pragma weak was used, mark the decl weak now. */
6242 if (current_scope == file_scope)
6243 maybe_apply_pragma_weak (decl1);
6245 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6246 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6248 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6249 != integer_type_node)
6250 pedwarn ("return type of %q+D is not %<int%>", decl1);
6252 check_main_parameter_types(decl1);
6254 if (!TREE_PUBLIC (decl1))
6255 pedwarn ("%q+D is normally a non-static function", decl1);
6258 /* Record the decl so that the function name is defined.
6259 If we already have a decl for this name, and it is a FUNCTION_DECL,
6260 use the old decl. */
6262 current_function_decl = pushdecl (decl1);
6265 declare_parm_level ();
6267 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6268 /* Promote the value to int before returning it. */
6269 if (c_promoting_integer_type_p (restype))
6271 /* It retains unsignedness if not really getting wider. */
6272 if (TYPE_UNSIGNED (restype)
6273 && (TYPE_PRECISION (restype)
6274 == TYPE_PRECISION (integer_type_node)))
6275 restype = unsigned_type_node;
6277 restype = integer_type_node;
6280 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6281 DECL_ARTIFICIAL (resdecl) = 1;
6282 DECL_IGNORED_P (resdecl) = 1;
6283 DECL_RESULT (current_function_decl) = resdecl;
6285 start_fname_decls ();
6290 /* Subroutine of store_parm_decls which handles new-style function
6291 definitions (prototype format). The parms already have decls, so we
6292 need only record them as in effect and complain if any redundant
6293 old-style parm decls were written. */
6295 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6299 if (current_scope->bindings)
6301 error ("%Jold-style parameter declarations in prototyped "
6302 "function definition", fndecl);
6304 /* Get rid of the old-style declarations. */
6308 /* Don't issue this warning for nested functions, and don't issue this
6309 warning if we got here because ARG_INFO_TYPES was error_mark_node
6310 (this happens when a function definition has just an ellipsis in
6311 its parameter list). */
6312 else if (!in_system_header && !current_function_scope
6313 && arg_info->types != error_mark_node)
6314 warning (OPT_Wtraditional,
6315 "%Jtraditional C rejects ISO C style function definitions",
6318 /* Now make all the parameter declarations visible in the function body.
6319 We can bypass most of the grunt work of pushdecl. */
6320 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6322 DECL_CONTEXT (decl) = current_function_decl;
6323 if (DECL_NAME (decl))
6325 bind (DECL_NAME (decl), decl, current_scope,
6326 /*invisible=*/false, /*nested=*/false);
6327 if (!TREE_USED (decl))
6328 warn_if_shadowing (decl);
6331 error ("%Jparameter name omitted", decl);
6334 /* Record the parameter list in the function declaration. */
6335 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6337 /* Now make all the ancillary declarations visible, likewise. */
6338 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6340 DECL_CONTEXT (decl) = current_function_decl;
6341 if (DECL_NAME (decl))
6342 bind (DECL_NAME (decl), decl, current_scope,
6343 /*invisible=*/false, /*nested=*/false);
6346 /* And all the tag declarations. */
6347 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6348 if (TREE_PURPOSE (decl))
6349 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6350 /*invisible=*/false, /*nested=*/false);
6353 /* Subroutine of store_parm_decls which handles old-style function
6354 definitions (separate parameter list and declarations). */
6357 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6359 struct c_binding *b;
6360 tree parm, decl, last;
6361 tree parmids = arg_info->parms;
6362 struct pointer_set_t *seen_args = pointer_set_create ();
6364 if (!in_system_header)
6365 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6368 /* Match each formal parameter name with its declaration. Save each
6369 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6370 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6372 if (TREE_VALUE (parm) == 0)
6374 error ("%Jparameter name missing from parameter list", fndecl);
6375 TREE_PURPOSE (parm) = 0;
6379 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6380 if (b && B_IN_CURRENT_SCOPE (b))
6383 /* If we got something other than a PARM_DECL it is an error. */
6384 if (TREE_CODE (decl) != PARM_DECL)
6385 error ("%q+D declared as a non-parameter", decl);
6386 /* If the declaration is already marked, we have a duplicate
6387 name. Complain and ignore the duplicate. */
6388 else if (pointer_set_contains (seen_args, decl))
6390 error ("multiple parameters named %q+D", decl);
6391 TREE_PURPOSE (parm) = 0;
6394 /* If the declaration says "void", complain and turn it into
6396 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6398 error ("parameter %q+D declared with void type", decl);
6399 TREE_TYPE (decl) = integer_type_node;
6400 DECL_ARG_TYPE (decl) = integer_type_node;
6401 layout_decl (decl, 0);
6403 warn_if_shadowing (decl);
6405 /* If no declaration found, default to int. */
6408 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6409 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6410 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6412 warn_if_shadowing (decl);
6415 pedwarn ("type of %q+D defaults to %<int%>", decl);
6417 warning (OPT_Wmissing_parameter_type, "type of %q+D defaults to %<int%>", decl);
6420 TREE_PURPOSE (parm) = decl;
6421 pointer_set_insert (seen_args, decl);
6424 /* Now examine the parms chain for incomplete declarations
6425 and declarations with no corresponding names. */
6427 for (b = current_scope->bindings; b; b = b->prev)
6430 if (TREE_CODE (parm) != PARM_DECL)
6433 if (TREE_TYPE (parm) != error_mark_node
6434 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6436 error ("parameter %q+D has incomplete type", parm);
6437 TREE_TYPE (parm) = error_mark_node;
6440 if (!pointer_set_contains (seen_args, parm))
6442 error ("declaration for parameter %q+D but no such parameter", parm);
6444 /* Pretend the parameter was not missing.
6445 This gets us to a standard state and minimizes
6446 further error messages. */
6447 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6451 /* Chain the declarations together in the order of the list of
6452 names. Store that chain in the function decl, replacing the
6453 list of names. Update the current scope to match. */
6454 DECL_ARGUMENTS (fndecl) = 0;
6456 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6457 if (TREE_PURPOSE (parm))
6459 if (parm && TREE_PURPOSE (parm))
6461 last = TREE_PURPOSE (parm);
6462 DECL_ARGUMENTS (fndecl) = last;
6464 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6465 if (TREE_PURPOSE (parm))
6467 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6468 last = TREE_PURPOSE (parm);
6470 TREE_CHAIN (last) = 0;
6473 pointer_set_destroy (seen_args);
6475 /* If there was a previous prototype,
6476 set the DECL_ARG_TYPE of each argument according to
6477 the type previously specified, and report any mismatches. */
6479 if (current_function_prototype_arg_types)
6482 for (parm = DECL_ARGUMENTS (fndecl),
6483 type = current_function_prototype_arg_types;
6484 parm || (type && TREE_VALUE (type) != error_mark_node
6485 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
6486 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6488 if (parm == 0 || type == 0
6489 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6491 if (current_function_prototype_built_in)
6492 warning (0, "number of arguments doesn%'t match "
6493 "built-in prototype");
6496 error ("number of arguments doesn%'t match prototype");
6497 error ("%Hprototype declaration",
6498 ¤t_function_prototype_locus);
6502 /* Type for passing arg must be consistent with that
6503 declared for the arg. ISO C says we take the unqualified
6504 type for parameters declared with qualified type. */
6505 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6506 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6508 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6509 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6511 /* Adjust argument to match prototype. E.g. a previous
6512 `int foo(float);' prototype causes
6513 `int foo(x) float x; {...}' to be treated like
6514 `int foo(float x) {...}'. This is particularly
6515 useful for argument types like uid_t. */
6516 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6518 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6519 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6520 && TYPE_PRECISION (TREE_TYPE (parm))
6521 < TYPE_PRECISION (integer_type_node))
6522 DECL_ARG_TYPE (parm) = integer_type_node;
6526 /* ??? Is it possible to get here with a
6527 built-in prototype or will it always have
6528 been diagnosed as conflicting with an
6529 old-style definition and discarded? */
6530 if (current_function_prototype_built_in)
6531 warning (0, "promoted argument %qD "
6532 "doesn%'t match built-in prototype", parm);
6535 pedwarn ("promoted argument %qD "
6536 "doesn%'t match prototype", parm);
6537 pedwarn ("%Hprototype declaration",
6538 ¤t_function_prototype_locus);
6544 if (current_function_prototype_built_in)
6545 warning (0, "argument %qD doesn%'t match "
6546 "built-in prototype", parm);
6549 error ("argument %qD doesn%'t match prototype", parm);
6550 error ("%Hprototype declaration",
6551 ¤t_function_prototype_locus);
6556 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6559 /* Otherwise, create a prototype that would match. */
6563 tree actual = 0, last = 0, type;
6565 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6567 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6569 TREE_CHAIN (last) = type;
6574 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6576 TREE_CHAIN (last) = type;
6580 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6581 of the type of this function, but we need to avoid having this
6582 affect the types of other similarly-typed functions, so we must
6583 first force the generation of an identical (but separate) type
6584 node for the relevant function type. The new node we create
6585 will be a variant of the main variant of the original function
6588 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6590 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6594 /* Store parameter declarations passed in ARG_INFO into the current
6595 function declaration. */
6598 store_parm_decls_from (struct c_arg_info *arg_info)
6600 current_function_arg_info = arg_info;
6601 store_parm_decls ();
6604 /* Store the parameter declarations into the current function declaration.
6605 This is called after parsing the parameter declarations, before
6606 digesting the body of the function.
6608 For an old-style definition, construct a prototype out of the old-style
6609 parameter declarations and inject it into the function's type. */
6612 store_parm_decls (void)
6614 tree fndecl = current_function_decl;
6617 /* The argument information block for FNDECL. */
6618 struct c_arg_info *arg_info = current_function_arg_info;
6619 current_function_arg_info = 0;
6621 /* True if this definition is written with a prototype. Note:
6622 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6623 list in a function definition as equivalent to (void) -- an
6624 empty argument list specifies the function has no parameters,
6625 but only (void) sets up a prototype for future calls. */
6626 proto = arg_info->types != 0;
6629 store_parm_decls_newstyle (fndecl, arg_info);
6631 store_parm_decls_oldstyle (fndecl, arg_info);
6633 /* The next call to push_scope will be a function body. */
6635 next_is_function_body = true;
6637 /* Write a record describing this function definition to the prototypes
6638 file (if requested). */
6640 gen_aux_info_record (fndecl, 1, 0, proto);
6642 /* Initialize the RTL code for the function. */
6643 allocate_struct_function (fndecl);
6645 /* Begin the statement tree for this function. */
6646 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6648 /* ??? Insert the contents of the pending sizes list into the function
6649 to be evaluated. The only reason left to have this is
6650 void foo(int n, int array[n++])
6651 because we throw away the array type in favor of a pointer type, and
6652 thus won't naturally see the SAVE_EXPR containing the increment. All
6653 other pending sizes would be handled by gimplify_parameters. */
6656 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6657 add_stmt (TREE_VALUE (t));
6660 /* Even though we're inside a function body, we still don't want to
6661 call expand_expr to calculate the size of a variable-sized array.
6662 We haven't necessarily assigned RTL to all variables yet, so it's
6663 not safe to try to expand expressions involving them. */
6664 cfun->x_dont_save_pending_sizes_p = 1;
6667 /* Emit diagnostics that require gimple input for detection. Operate on
6668 FNDECL and all its nested functions. */
6671 c_gimple_diagnostics_recursively (tree fndecl)
6673 struct cgraph_node *cgn;
6675 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6676 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6678 /* Notice when OpenMP structured block constraints are violated. */
6680 diagnose_omp_structured_block_errors (fndecl);
6682 /* Finalize all nested functions now. */
6683 cgn = cgraph_node (fndecl);
6684 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6685 c_gimple_diagnostics_recursively (cgn->decl);
6688 /* Finish up a function declaration and compile that function
6689 all the way to assembler language output. The free the storage
6690 for the function definition.
6692 This is called after parsing the body of the function definition. */
6695 finish_function (void)
6697 tree fndecl = current_function_decl;
6699 label_context_stack_se = label_context_stack_se->next;
6700 label_context_stack_vm = label_context_stack_vm->next;
6702 if (TREE_CODE (fndecl) == FUNCTION_DECL
6703 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6705 tree args = DECL_ARGUMENTS (fndecl);
6706 for (; args; args = TREE_CHAIN (args))
6708 tree type = TREE_TYPE (args);
6709 if (INTEGRAL_TYPE_P (type)
6710 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6711 DECL_ARG_TYPE (args) = integer_type_node;
6715 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6716 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6718 /* Must mark the RESULT_DECL as being in this function. */
6720 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6721 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6723 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6725 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6726 != integer_type_node)
6728 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6729 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6731 pedwarn ("return type of %q+D is not %<int%>", fndecl);
6737 tree stmt = c_finish_return (integer_zero_node);
6738 #ifdef USE_MAPPED_LOCATION
6739 /* Hack. We don't want the middle-end to warn that this return
6740 is unreachable, so we mark its location as special. Using
6741 UNKNOWN_LOCATION has the problem that it gets clobbered in
6742 annotate_one_with_locus. A cleaner solution might be to
6743 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6745 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6747 /* Hack. We don't want the middle-end to warn that this
6748 return is unreachable, so put the statement on the
6750 annotate_with_file_line (stmt, input_filename, 0);
6756 /* Tie off the statement tree for this function. */
6757 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6759 finish_fname_decls ();
6761 /* Complain if there's just no return statement. */
6762 if (warn_return_type
6763 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6764 && !current_function_returns_value && !current_function_returns_null
6765 /* Don't complain if we are no-return. */
6766 && !current_function_returns_abnormally
6767 /* Don't warn for main(). */
6768 && !MAIN_NAME_P (DECL_NAME (fndecl))
6769 /* Or if they didn't actually specify a return type. */
6770 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6771 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6772 inline function, as we might never be compiled separately. */
6773 && DECL_INLINE (fndecl))
6775 warning (OPT_Wreturn_type,
6776 "no return statement in function returning non-void");
6777 TREE_NO_WARNING (fndecl) = 1;
6780 /* Store the end of the function, so that we get good line number
6781 info for the epilogue. */
6782 cfun->function_end_locus = input_location;
6784 /* Finalize the ELF visibility for the function. */
6785 c_determine_visibility (fndecl);
6787 /* Genericize before inlining. Delay genericizing nested functions
6788 until their parent function is genericized. Since finalizing
6789 requires GENERIC, delay that as well. */
6791 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6792 && !undef_nested_function)
6794 if (!decl_function_context (fndecl))
6796 c_genericize (fndecl);
6797 c_gimple_diagnostics_recursively (fndecl);
6799 /* ??? Objc emits functions after finalizing the compilation unit.
6800 This should be cleaned up later and this conditional removed. */
6801 if (cgraph_global_info_ready)
6803 c_expand_body (fndecl);
6807 cgraph_finalize_function (fndecl, false);
6811 /* Register this function with cgraph just far enough to get it
6812 added to our parent's nested function list. Handy, since the
6813 C front end doesn't have such a list. */
6814 (void) cgraph_node (fndecl);
6818 if (!decl_function_context (fndecl))
6819 undef_nested_function = false;
6821 /* We're leaving the context of this function, so zap cfun.
6822 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6823 tree_rest_of_compilation. */
6825 current_function_decl = NULL;
6828 /* Check the declarations given in a for-loop for satisfying the C99
6829 constraints. If exactly one such decl is found, return it. */
6832 check_for_loop_decls (void)
6834 struct c_binding *b;
6835 tree one_decl = NULL_TREE;
6841 /* If we get here, declarations have been used in a for loop without
6842 the C99 for loop scope. This doesn't make much sense, so don't
6844 error ("%<for%> loop initial declaration used outside C99 mode");
6847 /* C99 subclause 6.8.5 paragraph 3:
6849 [#3] The declaration part of a for statement shall only
6850 declare identifiers for objects having storage class auto or
6853 It isn't clear whether, in this sentence, "identifiers" binds to
6854 "shall only declare" or to "objects" - that is, whether all identifiers
6855 declared must be identifiers for objects, or whether the restriction
6856 only applies to those that are. (A question on this in comp.std.c
6857 in November 2000 received no answer.) We implement the strictest
6858 interpretation, to avoid creating an extension which later causes
6861 for (b = current_scope->bindings; b; b = b->prev)
6864 tree decl = b->decl;
6869 switch (TREE_CODE (decl))
6872 if (TREE_STATIC (decl))
6873 error ("declaration of static variable %q+D in %<for%> loop "
6874 "initial declaration", decl);
6875 else if (DECL_EXTERNAL (decl))
6876 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6877 "initial declaration", decl);
6881 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6885 error ("%<union %E%> declared in %<for%> loop initial declaration",
6889 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6893 error ("declaration of non-variable %q+D in %<for%> loop "
6894 "initial declaration", decl);
6901 return n_decls == 1 ? one_decl : NULL_TREE;
6904 /* Save and reinitialize the variables
6905 used during compilation of a C function. */
6908 c_push_function_context (struct function *f)
6910 struct language_function *p;
6911 p = GGC_NEW (struct language_function);
6914 p->base.x_stmt_tree = c_stmt_tree;
6915 p->x_break_label = c_break_label;
6916 p->x_cont_label = c_cont_label;
6917 p->x_switch_stack = c_switch_stack;
6918 p->arg_info = current_function_arg_info;
6919 p->returns_value = current_function_returns_value;
6920 p->returns_null = current_function_returns_null;
6921 p->returns_abnormally = current_function_returns_abnormally;
6922 p->warn_about_return_type = warn_about_return_type;
6925 /* Restore the variables used during compilation of a C function. */
6928 c_pop_function_context (struct function *f)
6930 struct language_function *p = f->language;
6932 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6933 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6935 /* Stop pointing to the local nodes about to be freed. */
6936 /* But DECL_INITIAL must remain nonzero so we know this
6937 was an actual function definition. */
6938 DECL_INITIAL (current_function_decl) = error_mark_node;
6939 DECL_ARGUMENTS (current_function_decl) = 0;
6942 c_stmt_tree = p->base.x_stmt_tree;
6943 c_break_label = p->x_break_label;
6944 c_cont_label = p->x_cont_label;
6945 c_switch_stack = p->x_switch_stack;
6946 current_function_arg_info = p->arg_info;
6947 current_function_returns_value = p->returns_value;
6948 current_function_returns_null = p->returns_null;
6949 current_function_returns_abnormally = p->returns_abnormally;
6950 warn_about_return_type = p->warn_about_return_type;
6955 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6958 c_dup_lang_specific_decl (tree decl)
6960 struct lang_decl *ld;
6962 if (!DECL_LANG_SPECIFIC (decl))
6965 ld = GGC_NEW (struct lang_decl);
6966 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6967 DECL_LANG_SPECIFIC (decl) = ld;
6970 /* The functions below are required for functionality of doing
6971 function at once processing in the C front end. Currently these
6972 functions are not called from anywhere in the C front end, but as
6973 these changes continue, that will change. */
6975 /* Returns the stmt_tree (if any) to which statements are currently
6976 being added. If there is no active statement-tree, NULL is
6980 current_stmt_tree (void)
6982 return &c_stmt_tree;
6985 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6989 anon_aggr_type_p (tree ARG_UNUSED (node))
6994 /* Return the global value of T as a symbol. */
6997 identifier_global_value (tree t)
6999 struct c_binding *b;
7001 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
7002 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
7008 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7009 otherwise the name is found in ridpointers from RID_INDEX. */
7012 record_builtin_type (enum rid rid_index, const char *name, tree type)
7016 id = ridpointers[(int) rid_index];
7018 id = get_identifier (name);
7019 decl = build_decl (TYPE_DECL, id, type);
7021 if (debug_hooks->type_decl)
7022 debug_hooks->type_decl (decl, false);
7025 /* Build the void_list_node (void_type_node having been created). */
7027 build_void_list_node (void)
7029 tree t = build_tree_list (NULL_TREE, void_type_node);
7033 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
7036 build_c_parm (struct c_declspecs *specs, tree attrs,
7037 struct c_declarator *declarator)
7039 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
7042 ret->declarator = declarator;
7046 /* Return a declarator with nested attributes. TARGET is the inner
7047 declarator to which these attributes apply. ATTRS are the
7050 struct c_declarator *
7051 build_attrs_declarator (tree attrs, struct c_declarator *target)
7053 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7054 ret->kind = cdk_attrs;
7055 ret->declarator = target;
7056 ret->u.attrs = attrs;
7060 /* Return a declarator for a function with arguments specified by ARGS
7061 and return type specified by TARGET. */
7063 struct c_declarator *
7064 build_function_declarator (struct c_arg_info *args,
7065 struct c_declarator *target)
7067 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7068 ret->kind = cdk_function;
7069 ret->declarator = target;
7070 ret->u.arg_info = args;
7074 /* Return a declarator for the identifier IDENT (which may be
7075 NULL_TREE for an abstract declarator). */
7077 struct c_declarator *
7078 build_id_declarator (tree ident)
7080 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7082 ret->declarator = 0;
7084 /* Default value - may get reset to a more precise location. */
7085 ret->id_loc = input_location;
7089 /* Return something to represent absolute declarators containing a *.
7090 TARGET is the absolute declarator that the * contains.
7091 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7092 to apply to the pointer type. */
7094 struct c_declarator *
7095 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
7096 struct c_declarator *target)
7100 struct c_declarator *itarget = target;
7101 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7102 if (type_quals_attrs)
7104 attrs = type_quals_attrs->attrs;
7105 quals = quals_from_declspecs (type_quals_attrs);
7106 if (attrs != NULL_TREE)
7107 itarget = build_attrs_declarator (attrs, target);
7109 ret->kind = cdk_pointer;
7110 ret->declarator = itarget;
7111 ret->u.pointer_quals = quals;
7115 /* Return a pointer to a structure for an empty list of declaration
7118 struct c_declspecs *
7119 build_null_declspecs (void)
7121 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
7125 ret->typespec_word = cts_none;
7126 ret->storage_class = csc_none;
7127 ret->declspecs_seen_p = false;
7128 ret->type_seen_p = false;
7129 ret->non_sc_seen_p = false;
7130 ret->typedef_p = false;
7131 ret->tag_defined_p = false;
7132 ret->explicit_signed_p = false;
7133 ret->deprecated_p = false;
7134 ret->default_int_p = false;
7135 ret->long_p = false;
7136 ret->long_long_p = false;
7137 ret->short_p = false;
7138 ret->signed_p = false;
7139 ret->unsigned_p = false;
7140 ret->complex_p = false;
7141 ret->inline_p = false;
7142 ret->thread_p = false;
7143 ret->const_p = false;
7144 ret->volatile_p = false;
7145 ret->restrict_p = false;
7149 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7152 struct c_declspecs *
7153 declspecs_add_qual (struct c_declspecs *specs, tree qual)
7157 specs->non_sc_seen_p = true;
7158 specs->declspecs_seen_p = true;
7159 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
7160 && C_IS_RESERVED_WORD (qual));
7161 i = C_RID_CODE (qual);
7165 dupe = specs->const_p;
7166 specs->const_p = true;
7169 dupe = specs->volatile_p;
7170 specs->volatile_p = true;
7173 dupe = specs->restrict_p;
7174 specs->restrict_p = true;
7179 if (dupe && pedantic && !flag_isoc99)
7180 pedwarn ("duplicate %qE", qual);
7184 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7187 struct c_declspecs *
7188 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7190 tree type = spec.spec;
7191 specs->non_sc_seen_p = true;
7192 specs->declspecs_seen_p = true;
7193 specs->type_seen_p = true;
7194 if (TREE_DEPRECATED (type))
7195 specs->deprecated_p = true;
7197 /* Handle type specifier keywords. */
7198 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
7200 enum rid i = C_RID_CODE (type);
7203 error ("two or more data types in declaration specifiers");
7206 if ((int) i <= (int) RID_LAST_MODIFIER)
7208 /* "long", "short", "signed", "unsigned" or "_Complex". */
7213 if (specs->long_long_p)
7215 error ("%<long long long%> is too long for GCC");
7220 if (specs->typespec_word == cts_double)
7222 error ("both %<long long%> and %<double%> in "
7223 "declaration specifiers");
7226 if (pedantic && !flag_isoc99 && !in_system_header
7228 pedwarn ("ISO C90 does not support %<long long%>");
7229 specs->long_long_p = 1;
7233 error ("both %<long%> and %<short%> in "
7234 "declaration specifiers");
7235 else if (specs->typespec_word == cts_void)
7236 error ("both %<long%> and %<void%> in "
7237 "declaration specifiers");
7238 else if (specs->typespec_word == cts_bool)
7239 error ("both %<long%> and %<_Bool%> in "
7240 "declaration specifiers");
7241 else if (specs->typespec_word == cts_char)
7242 error ("both %<long%> and %<char%> in "
7243 "declaration specifiers");
7244 else if (specs->typespec_word == cts_float)
7245 error ("both %<long%> and %<float%> in "
7246 "declaration specifiers");
7247 else if (specs->typespec_word == cts_dfloat32)
7248 error ("both %<long%> and %<_Decimal32%> in "
7249 "declaration specifiers");
7250 else if (specs->typespec_word == cts_dfloat64)
7251 error ("both %<long%> and %<_Decimal64%> in "
7252 "declaration specifiers");
7253 else if (specs->typespec_word == cts_dfloat128)
7254 error ("both %<long%> and %<_Decimal128%> in "
7255 "declaration specifiers");
7257 specs->long_p = true;
7260 dupe = specs->short_p;
7262 error ("both %<long%> and %<short%> in "
7263 "declaration specifiers");
7264 else if (specs->typespec_word == cts_void)
7265 error ("both %<short%> and %<void%> in "
7266 "declaration specifiers");
7267 else if (specs->typespec_word == cts_bool)
7268 error ("both %<short%> and %<_Bool%> in "
7269 "declaration specifiers");
7270 else if (specs->typespec_word == cts_char)
7271 error ("both %<short%> and %<char%> in "
7272 "declaration specifiers");
7273 else if (specs->typespec_word == cts_float)
7274 error ("both %<short%> and %<float%> in "
7275 "declaration specifiers");
7276 else if (specs->typespec_word == cts_double)
7277 error ("both %<short%> and %<double%> in "
7278 "declaration specifiers");
7279 else if (specs->typespec_word == cts_dfloat32)
7280 error ("both %<short%> and %<_Decimal32%> in "
7281 "declaration specifiers");
7282 else if (specs->typespec_word == cts_dfloat64)
7283 error ("both %<short%> and %<_Decimal64%> in "
7284 "declaration specifiers");
7285 else if (specs->typespec_word == cts_dfloat128)
7286 error ("both %<short%> and %<_Decimal128%> in "
7287 "declaration specifiers");
7289 specs->short_p = true;
7292 dupe = specs->signed_p;
7293 if (specs->unsigned_p)
7294 error ("both %<signed%> and %<unsigned%> in "
7295 "declaration specifiers");
7296 else if (specs->typespec_word == cts_void)
7297 error ("both %<signed%> and %<void%> in "
7298 "declaration specifiers");
7299 else if (specs->typespec_word == cts_bool)
7300 error ("both %<signed%> and %<_Bool%> in "
7301 "declaration specifiers");
7302 else if (specs->typespec_word == cts_float)
7303 error ("both %<signed%> and %<float%> in "
7304 "declaration specifiers");
7305 else if (specs->typespec_word == cts_double)
7306 error ("both %<signed%> and %<double%> in "
7307 "declaration specifiers");
7308 else if (specs->typespec_word == cts_dfloat32)
7309 error ("both %<signed%> and %<_Decimal32%> in "
7310 "declaration specifiers");
7311 else if (specs->typespec_word == cts_dfloat64)
7312 error ("both %<signed%> and %<_Decimal64%> in "
7313 "declaration specifiers");
7314 else if (specs->typespec_word == cts_dfloat128)
7315 error ("both %<signed%> and %<_Decimal128%> in "
7316 "declaration specifiers");
7318 specs->signed_p = true;
7321 dupe = specs->unsigned_p;
7322 if (specs->signed_p)
7323 error ("both %<signed%> and %<unsigned%> in "
7324 "declaration specifiers");
7325 else if (specs->typespec_word == cts_void)
7326 error ("both %<unsigned%> and %<void%> in "
7327 "declaration specifiers");
7328 else if (specs->typespec_word == cts_bool)
7329 error ("both %<unsigned%> and %<_Bool%> in "
7330 "declaration specifiers");
7331 else if (specs->typespec_word == cts_float)
7332 error ("both %<unsigned%> and %<float%> in "
7333 "declaration specifiers");
7334 else if (specs->typespec_word == cts_double)
7335 error ("both %<unsigned%> and %<double%> in "
7336 "declaration specifiers");
7337 else if (specs->typespec_word == cts_dfloat32)
7338 error ("both %<unsigned%> and %<_Decimal32%> in "
7339 "declaration specifiers");
7340 else if (specs->typespec_word == cts_dfloat64)
7341 error ("both %<unsigned%> and %<_Decimal64%> in "
7342 "declaration specifiers");
7343 else if (specs->typespec_word == cts_dfloat128)
7344 error ("both %<unsigned%> and %<_Decimal128%> in "
7345 "declaration specifiers");
7347 specs->unsigned_p = true;
7350 dupe = specs->complex_p;
7351 if (pedantic && !flag_isoc99 && !in_system_header)
7352 pedwarn ("ISO C90 does not support complex types");
7353 if (specs->typespec_word == cts_void)
7354 error ("both %<complex%> and %<void%> in "
7355 "declaration specifiers");
7356 else if (specs->typespec_word == cts_bool)
7357 error ("both %<complex%> and %<_Bool%> in "
7358 "declaration specifiers");
7359 else if (specs->typespec_word == cts_dfloat32)
7360 error ("both %<complex%> and %<_Decimal32%> in "
7361 "declaration specifiers");
7362 else if (specs->typespec_word == cts_dfloat64)
7363 error ("both %<complex%> and %<_Decimal64%> in "
7364 "declaration specifiers");
7365 else if (specs->typespec_word == cts_dfloat128)
7366 error ("both %<complex%> and %<_Decimal128%> in "
7367 "declaration specifiers");
7369 specs->complex_p = true;
7376 error ("duplicate %qE", type);
7382 /* "void", "_Bool", "char", "int", "float" or "double". */
7383 if (specs->typespec_word != cts_none)
7385 error ("two or more data types in declaration specifiers");
7392 error ("both %<long%> and %<void%> in "
7393 "declaration specifiers");
7394 else if (specs->short_p)
7395 error ("both %<short%> and %<void%> in "
7396 "declaration specifiers");
7397 else if (specs->signed_p)
7398 error ("both %<signed%> and %<void%> in "
7399 "declaration specifiers");
7400 else if (specs->unsigned_p)
7401 error ("both %<unsigned%> and %<void%> in "
7402 "declaration specifiers");
7403 else if (specs->complex_p)
7404 error ("both %<complex%> and %<void%> in "
7405 "declaration specifiers");
7407 specs->typespec_word = cts_void;
7411 error ("both %<long%> and %<_Bool%> in "
7412 "declaration specifiers");
7413 else if (specs->short_p)
7414 error ("both %<short%> and %<_Bool%> in "
7415 "declaration specifiers");
7416 else if (specs->signed_p)
7417 error ("both %<signed%> and %<_Bool%> in "
7418 "declaration specifiers");
7419 else if (specs->unsigned_p)
7420 error ("both %<unsigned%> and %<_Bool%> in "
7421 "declaration specifiers");
7422 else if (specs->complex_p)
7423 error ("both %<complex%> and %<_Bool%> in "
7424 "declaration specifiers");
7426 specs->typespec_word = cts_bool;
7430 error ("both %<long%> and %<char%> in "
7431 "declaration specifiers");
7432 else if (specs->short_p)
7433 error ("both %<short%> and %<char%> in "
7434 "declaration specifiers");
7436 specs->typespec_word = cts_char;
7439 specs->typespec_word = cts_int;
7443 error ("both %<long%> and %<float%> in "
7444 "declaration specifiers");
7445 else if (specs->short_p)
7446 error ("both %<short%> and %<float%> in "
7447 "declaration specifiers");
7448 else if (specs->signed_p)
7449 error ("both %<signed%> and %<float%> in "
7450 "declaration specifiers");
7451 else if (specs->unsigned_p)
7452 error ("both %<unsigned%> and %<float%> in "
7453 "declaration specifiers");
7455 specs->typespec_word = cts_float;
7458 if (specs->long_long_p)
7459 error ("both %<long long%> and %<double%> in "
7460 "declaration specifiers");
7461 else if (specs->short_p)
7462 error ("both %<short%> and %<double%> in "
7463 "declaration specifiers");
7464 else if (specs->signed_p)
7465 error ("both %<signed%> and %<double%> in "
7466 "declaration specifiers");
7467 else if (specs->unsigned_p)
7468 error ("both %<unsigned%> and %<double%> in "
7469 "declaration specifiers");
7471 specs->typespec_word = cts_double;
7478 if (i == RID_DFLOAT32)
7480 else if (i == RID_DFLOAT64)
7483 str = "_Decimal128";
7484 if (specs->long_long_p)
7485 error ("both %<long long%> and %<%s%> in "
7486 "declaration specifiers", str);
7488 error ("both %<long%> and %<%s%> in "
7489 "declaration specifiers", str);
7490 else if (specs->short_p)
7491 error ("both %<short%> and %<%s%> in "
7492 "declaration specifiers", str);
7493 else if (specs->signed_p)
7494 error ("both %<signed%> and %<%s%> in "
7495 "declaration specifiers", str);
7496 else if (specs->unsigned_p)
7497 error ("both %<unsigned%> and %<%s%> in "
7498 "declaration specifiers", str);
7499 else if (specs->complex_p)
7500 error ("both %<complex%> and %<%s%> in "
7501 "declaration specifiers", str);
7502 else if (i == RID_DFLOAT32)
7503 specs->typespec_word = cts_dfloat32;
7504 else if (i == RID_DFLOAT64)
7505 specs->typespec_word = cts_dfloat64;
7507 specs->typespec_word = cts_dfloat128;
7509 if (!targetm.decimal_float_supported_p ())
7510 error ("decimal floating point not supported for this target");
7512 pedwarn ("ISO C does not support decimal floating point");
7515 /* ObjC reserved word "id", handled below. */
7521 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7522 form of ObjC type, cases such as "int" and "long" being handled
7523 above), a TYPE (struct, union, enum and typeof specifiers) or an
7524 ERROR_MARK. In none of these cases may there have previously
7525 been any type specifiers. */
7526 if (specs->type || specs->typespec_word != cts_none
7527 || specs->long_p || specs->short_p || specs->signed_p
7528 || specs->unsigned_p || specs->complex_p)
7529 error ("two or more data types in declaration specifiers");
7530 else if (TREE_CODE (type) == TYPE_DECL)
7532 if (TREE_TYPE (type) == error_mark_node)
7533 ; /* Allow the type to default to int to avoid cascading errors. */
7536 specs->type = TREE_TYPE (type);
7537 specs->decl_attr = DECL_ATTRIBUTES (type);
7538 specs->typedef_p = true;
7539 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7542 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7544 tree t = lookup_name (type);
7545 if (!t || TREE_CODE (t) != TYPE_DECL)
7546 error ("%qE fails to be a typedef or built in type", type);
7547 else if (TREE_TYPE (t) == error_mark_node)
7550 specs->type = TREE_TYPE (t);
7552 else if (TREE_CODE (type) != ERROR_MARK)
7554 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7555 specs->tag_defined_p = true;
7556 if (spec.kind == ctsk_typeof)
7557 specs->typedef_p = true;
7564 /* Add the storage class specifier or function specifier SCSPEC to the
7565 declaration specifiers SPECS, returning SPECS. */
7567 struct c_declspecs *
7568 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7571 enum c_storage_class n = csc_none;
7573 specs->declspecs_seen_p = true;
7574 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7575 && C_IS_RESERVED_WORD (scspec));
7576 i = C_RID_CODE (scspec);
7577 if (specs->non_sc_seen_p)
7578 warning (OPT_Wold_style_declaration,
7579 "%qE is not at beginning of declaration", scspec);
7583 /* C99 permits duplicate inline. Although of doubtful utility,
7584 it seems simplest to permit it in gnu89 mode as well, as
7585 there is also little utility in maintaining this as a
7586 difference between gnu89 and C99 inline. */
7588 specs->inline_p = true;
7591 dupe = specs->thread_p;
7592 if (specs->storage_class == csc_auto)
7593 error ("%<__thread%> used with %<auto%>");
7594 else if (specs->storage_class == csc_register)
7595 error ("%<__thread%> used with %<register%>");
7596 else if (specs->storage_class == csc_typedef)
7597 error ("%<__thread%> used with %<typedef%>");
7599 specs->thread_p = true;
7606 /* Diagnose "__thread extern". */
7607 if (specs->thread_p)
7608 error ("%<__thread%> before %<extern%>");
7615 /* Diagnose "__thread static". */
7616 if (specs->thread_p)
7617 error ("%<__thread%> before %<static%>");
7625 if (n != csc_none && n == specs->storage_class)
7628 error ("duplicate %qE", scspec);
7631 if (specs->storage_class != csc_none && n != specs->storage_class)
7633 error ("multiple storage classes in declaration specifiers");
7637 specs->storage_class = n;
7638 if (n != csc_extern && n != csc_static && specs->thread_p)
7640 error ("%<__thread%> used with %qE", scspec);
7641 specs->thread_p = false;
7648 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7651 struct c_declspecs *
7652 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7654 specs->attrs = chainon (attrs, specs->attrs);
7655 specs->declspecs_seen_p = true;
7659 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7660 specifiers with any other type specifier to determine the resulting
7661 type. This is where ISO C checks on complex types are made, since
7662 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7665 struct c_declspecs *
7666 finish_declspecs (struct c_declspecs *specs)
7668 /* If a type was specified as a whole, we have no modifiers and are
7670 if (specs->type != NULL_TREE)
7672 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7673 && !specs->signed_p && !specs->unsigned_p
7674 && !specs->complex_p);
7678 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7679 has been specified, treat it as "int" unless "_Complex" is
7680 present and there are no other specifiers. If we just have
7681 "_Complex", it is equivalent to "_Complex double", but e.g.
7682 "_Complex short" is equivalent to "_Complex short int". */
7683 if (specs->typespec_word == cts_none)
7685 if (specs->long_p || specs->short_p
7686 || specs->signed_p || specs->unsigned_p)
7688 specs->typespec_word = cts_int;
7690 else if (specs->complex_p)
7692 specs->typespec_word = cts_double;
7694 pedwarn ("ISO C does not support plain %<complex%> meaning "
7695 "%<double complex%>");
7699 specs->typespec_word = cts_int;
7700 specs->default_int_p = true;
7701 /* We don't diagnose this here because grokdeclarator will
7702 give more specific diagnostics according to whether it is
7703 a function definition. */
7707 /* If "signed" was specified, record this to distinguish "int" and
7708 "signed int" in the case of a bit-field with
7709 -funsigned-bitfields. */
7710 specs->explicit_signed_p = specs->signed_p;
7712 /* Now compute the actual type. */
7713 switch (specs->typespec_word)
7716 gcc_assert (!specs->long_p && !specs->short_p
7717 && !specs->signed_p && !specs->unsigned_p
7718 && !specs->complex_p);
7719 specs->type = void_type_node;
7722 gcc_assert (!specs->long_p && !specs->short_p
7723 && !specs->signed_p && !specs->unsigned_p
7724 && !specs->complex_p);
7725 specs->type = boolean_type_node;
7728 gcc_assert (!specs->long_p && !specs->short_p);
7729 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7730 if (specs->signed_p)
7731 specs->type = signed_char_type_node;
7732 else if (specs->unsigned_p)
7733 specs->type = unsigned_char_type_node;
7735 specs->type = char_type_node;
7736 if (specs->complex_p)
7739 pedwarn ("ISO C does not support complex integer types");
7740 specs->type = build_complex_type (specs->type);
7744 gcc_assert (!(specs->long_p && specs->short_p));
7745 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7746 if (specs->long_long_p)
7747 specs->type = (specs->unsigned_p
7748 ? long_long_unsigned_type_node
7749 : long_long_integer_type_node);
7750 else if (specs->long_p)
7751 specs->type = (specs->unsigned_p
7752 ? long_unsigned_type_node
7753 : long_integer_type_node);
7754 else if (specs->short_p)
7755 specs->type = (specs->unsigned_p
7756 ? short_unsigned_type_node
7757 : short_integer_type_node);
7759 specs->type = (specs->unsigned_p
7760 ? unsigned_type_node
7761 : integer_type_node);
7762 if (specs->complex_p)
7765 pedwarn ("ISO C does not support complex integer types");
7766 specs->type = build_complex_type (specs->type);
7770 gcc_assert (!specs->long_p && !specs->short_p
7771 && !specs->signed_p && !specs->unsigned_p);
7772 specs->type = (specs->complex_p
7773 ? complex_float_type_node
7777 gcc_assert (!specs->long_long_p && !specs->short_p
7778 && !specs->signed_p && !specs->unsigned_p);
7781 specs->type = (specs->complex_p
7782 ? complex_long_double_type_node
7783 : long_double_type_node);
7787 specs->type = (specs->complex_p
7788 ? complex_double_type_node
7789 : double_type_node);
7795 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7796 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
7797 if (specs->typespec_word == cts_dfloat32)
7798 specs->type = dfloat32_type_node;
7799 else if (specs->typespec_word == cts_dfloat64)
7800 specs->type = dfloat64_type_node;
7802 specs->type = dfloat128_type_node;
7811 /* A subroutine of c_write_global_declarations. Perform final processing
7812 on one file scope's declarations (or the external scope's declarations),
7816 c_write_global_declarations_1 (tree globals)
7821 /* Process the decls in the order they were written. */
7822 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7824 /* Check for used but undefined static functions using the C
7825 standard's definition of "used", and set TREE_NO_WARNING so
7826 that check_global_declarations doesn't repeat the check. */
7827 if (TREE_CODE (decl) == FUNCTION_DECL
7828 && DECL_INITIAL (decl) == 0
7829 && DECL_EXTERNAL (decl)
7830 && !TREE_PUBLIC (decl)
7831 && C_DECL_USED (decl))
7833 pedwarn ("%q+F used but never defined", decl);
7834 TREE_NO_WARNING (decl) = 1;
7837 wrapup_global_declaration_1 (decl);
7843 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7844 reconsider |= wrapup_global_declaration_2 (decl);
7848 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7849 check_global_declaration_1 (decl);
7852 /* A subroutine of c_write_global_declarations Emit debug information for each
7853 of the declarations in GLOBALS. */
7856 c_write_global_declarations_2 (tree globals)
7860 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
7861 debug_hooks->global_decl (decl);
7864 /* Preserve the external declarations scope across a garbage collect. */
7865 static GTY(()) tree ext_block;
7868 c_write_global_declarations (void)
7872 /* We don't want to do this if generating a PCH. */
7876 /* Don't waste time on further processing if -fsyntax-only or we've
7877 encountered errors. */
7878 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7881 /* Close the external scope. */
7882 ext_block = pop_scope ();
7884 gcc_assert (!current_scope);
7888 tree tmp = BLOCK_VARS (ext_block);
7890 FILE * stream = dump_begin (TDI_tu, &flags);
7893 dump_node (tmp, flags & ~TDF_SLIM, stream);
7894 dump_end (TDI_tu, stream);
7898 /* Process all file scopes in this compilation, and the external_scope,
7899 through wrapup_global_declarations and check_global_declarations. */
7900 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7901 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7902 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7904 /* We're done parsing; proceed to optimize and emit assembly.
7905 FIXME: shouldn't be the front end's responsibility to call this. */
7908 /* After cgraph has had a chance to emit everything that's going to
7909 be emitted, output debug information for globals. */
7910 if (errorcount == 0 && sorrycount == 0)
7912 timevar_push (TV_SYMOUT);
7913 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7914 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
7915 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
7916 timevar_pop (TV_SYMOUT);
7922 #include "gt-c-decl.h"