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, 2008
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
36 #include "tree-inline.h"
53 #include "langhooks.h"
54 #include "tree-mudflap.h"
55 #include "tree-gimple.h"
56 #include "diagnostic.h"
57 #include "tree-dump.h"
62 #include "langhooks-def.h"
63 #include "pointer-set.h"
65 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
67 { NORMAL, /* Ordinary declaration */
68 FUNCDEF, /* Function definition */
69 PARM, /* Declaration of parm before function body */
70 FIELD, /* Declaration inside struct or union */
71 TYPENAME}; /* Typename (inside cast or sizeof) */
73 /* States indicating how grokdeclarator() should handle declspecs marked
74 with __attribute__((deprecated)). An object declared as
75 __attribute__((deprecated)) suppresses warnings of uses of other
78 enum deprecated_states {
84 /* Nonzero if we have seen an invalid cross reference
85 to a struct, union, or enum, but not yet printed the message. */
86 tree pending_invalid_xref;
88 /* File and line to appear in the eventual error message. */
89 location_t pending_invalid_xref_location;
91 /* True means we've initialized exception handling. */
92 bool c_eh_initialized_p;
94 /* The file and line that the prototype came from if this is an
95 old-style definition; used for diagnostics in
96 store_parm_decls_oldstyle. */
98 static location_t current_function_prototype_locus;
100 /* Whether this prototype was built-in. */
102 static bool current_function_prototype_built_in;
104 /* The argument type information of this prototype. */
106 static tree current_function_prototype_arg_types;
108 /* The argument information structure for the function currently being
111 static struct c_arg_info *current_function_arg_info;
113 /* The obstack on which parser and related data structures, which are
114 not live beyond their top-level declaration or definition, are
116 struct obstack parser_obstack;
118 /* The current statement tree. */
120 static GTY(()) struct stmt_tree_s c_stmt_tree;
122 /* State saving variables. */
126 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
127 included in this invocation. Note that the current translation
128 unit is not included in this list. */
130 static GTY(()) tree all_translation_units;
132 /* A list of decls to be made automatically visible in each file scope. */
133 static GTY(()) tree visible_builtins;
135 /* Set to 0 at beginning of a function definition, set to 1 if
136 a return statement that specifies a return value is seen. */
138 int current_function_returns_value;
140 /* Set to 0 at beginning of a function definition, set to 1 if
141 a return statement with no argument is seen. */
143 int current_function_returns_null;
145 /* Set to 0 at beginning of a function definition, set to 1 if
146 a call to a noreturn function is seen. */
148 int current_function_returns_abnormally;
150 /* Set to nonzero by `grokdeclarator' for a function
151 whose return type is defaulted, if warnings for this are desired. */
153 static int warn_about_return_type;
155 /* Nonzero when the current toplevel function contains a declaration
156 of a nested function which is never defined. */
158 static bool undef_nested_function;
160 /* True means global_bindings_p should return false even if the scope stack
161 says we are in file scope. */
162 bool c_override_global_bindings_to_false;
165 /* Each c_binding structure describes one binding of an identifier to
166 a decl. All the decls in a scope - irrespective of namespace - are
167 chained together by the ->prev field, which (as the name implies)
168 runs in reverse order. All the decls in a given namespace bound to
169 a given identifier are chained by the ->shadowed field, which runs
170 from inner to outer scopes.
172 The ->decl field usually points to a DECL node, but there are two
173 exceptions. In the namespace of type tags, the bound entity is a
174 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
175 identifier is encountered, it is bound to error_mark_node to
176 suppress further errors about that identifier in the current
179 The ->type field stores the type of the declaration in this scope;
180 if NULL, the type is the type of the ->decl field. This is only of
181 relevance for objects with external or internal linkage which may
182 be redeclared in inner scopes, forming composite types that only
183 persist for the duration of those scopes. In the external scope,
184 this stores the composite of all the types declared for this
185 object, visible or not. The ->inner_comp field (used only at file
186 scope) stores whether an incomplete array type at file scope was
187 completed at an inner scope to an array size other than 1.
189 The depth field is copied from the scope structure that holds this
190 decl. It is used to preserve the proper ordering of the ->shadowed
191 field (see bind()) and also for a handful of special-case checks.
192 Finally, the invisible bit is true for a decl which should be
193 ignored for purposes of normal name lookup, and the nested bit is
194 true for a decl that's been bound a second time in an inner scope;
195 in all such cases, the binding in the outer scope will have its
196 invisible bit true. */
198 struct c_binding GTY((chain_next ("%h.prev")))
200 tree decl; /* the decl bound */
201 tree type; /* the type in this scope */
202 tree id; /* the identifier it's bound to */
203 struct c_binding *prev; /* the previous decl in this scope */
204 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
205 unsigned int depth : 28; /* depth of this scope */
206 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
207 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
208 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
211 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
212 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
213 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
214 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
216 #define I_SYMBOL_BINDING(node) \
217 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
218 #define I_SYMBOL_DECL(node) \
219 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
221 #define I_TAG_BINDING(node) \
222 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
223 #define I_TAG_DECL(node) \
224 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
226 #define I_LABEL_BINDING(node) \
227 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
228 #define I_LABEL_DECL(node) \
229 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
231 /* Each C symbol points to three linked lists of c_binding structures.
232 These describe the values of the identifier in the three different
233 namespaces defined by the language. */
235 struct lang_identifier GTY(())
237 struct c_common_identifier common_id;
238 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
239 struct c_binding *tag_binding; /* struct/union/enum tags */
240 struct c_binding *label_binding; /* labels */
243 /* Validate c-lang.c's assumptions. */
244 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
245 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
247 /* The resulting tree type. */
250 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
251 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) GENERIC_NEXT (&%h.generic))")))
253 union tree_node GTY ((tag ("0"),
254 desc ("tree_node_structure (&%h)")))
256 struct lang_identifier GTY ((tag ("1"))) identifier;
259 /* Each c_scope structure describes the complete contents of one
260 scope. Four scopes are distinguished specially: the innermost or
261 current scope, the innermost function scope, the file scope (always
262 the second to outermost) and the outermost or external scope.
264 Most declarations are recorded in the current scope.
266 All normal label declarations are recorded in the innermost
267 function scope, as are bindings of undeclared identifiers to
268 error_mark_node. (GCC permits nested functions as an extension,
269 hence the 'innermost' qualifier.) Explicitly declared labels
270 (using the __label__ extension) appear in the current scope.
272 Being in the file scope (current_scope == file_scope) causes
273 special behavior in several places below. Also, under some
274 conditions the Objective-C front end records declarations in the
275 file scope even though that isn't the current scope.
277 All declarations with external linkage are recorded in the external
278 scope, even if they aren't visible there; this models the fact that
279 such declarations are visible to the entire program, and (with a
280 bit of cleverness, see pushdecl) allows diagnosis of some violations
281 of C99 6.2.2p7 and 6.2.7p2:
283 If, within the same translation unit, the same identifier appears
284 with both internal and external linkage, the behavior is
287 All declarations that refer to the same object or function shall
288 have compatible type; otherwise, the behavior is undefined.
290 Initially only the built-in declarations, which describe compiler
291 intrinsic functions plus a subset of the standard library, are in
294 The order of the blocks list matters, and it is frequently appended
295 to. To avoid having to walk all the way to the end of the list on
296 each insertion, or reverse the list later, we maintain a pointer to
297 the last list entry. (FIXME: It should be feasible to use a reversed
300 The bindings list is strictly in reverse order of declarations;
301 pop_scope relies on this. */
304 struct c_scope GTY((chain_next ("%h.outer")))
306 /* The scope containing this one. */
307 struct c_scope *outer;
309 /* The next outermost function scope. */
310 struct c_scope *outer_function;
312 /* All bindings in this scope. */
313 struct c_binding *bindings;
315 /* For each scope (except the global one), a chain of BLOCK nodes
316 for all the scopes that were entered and exited one level down. */
320 /* The depth of this scope. Used to keep the ->shadowed chain of
321 bindings sorted innermost to outermost. */
322 unsigned int depth : 28;
324 /* True if we are currently filling this scope with parameter
326 BOOL_BITFIELD parm_flag : 1;
328 /* True if we saw [*] in this scope. Used to give an error messages
329 if these appears in a function definition. */
330 BOOL_BITFIELD had_vla_unspec : 1;
332 /* True if we already complained about forward parameter decls
333 in this scope. This prevents double warnings on
334 foo (int a; int b; ...) */
335 BOOL_BITFIELD warned_forward_parm_decls : 1;
337 /* True if this is the outermost block scope of a function body.
338 This scope contains the parameters, the local variables declared
339 in the outermost block, and all the labels (except those in
340 nested functions, or declared at block scope with __label__). */
341 BOOL_BITFIELD function_body : 1;
343 /* True means make a BLOCK for this scope no matter what. */
344 BOOL_BITFIELD keep : 1;
347 /* The scope currently in effect. */
349 static GTY(()) struct c_scope *current_scope;
351 /* The innermost function scope. Ordinary (not explicitly declared)
352 labels, bindings to error_mark_node, and the lazily-created
353 bindings of __func__ and its friends get this scope. */
355 static GTY(()) struct c_scope *current_function_scope;
357 /* The C file scope. This is reset for each input translation unit. */
359 static GTY(()) struct c_scope *file_scope;
361 /* The outermost scope. This is used for all declarations with
362 external linkage, and only these, hence the name. */
364 static GTY(()) struct c_scope *external_scope;
366 /* A chain of c_scope structures awaiting reuse. */
368 static GTY((deletable)) struct c_scope *scope_freelist;
370 /* A chain of c_binding structures awaiting reuse. */
372 static GTY((deletable)) struct c_binding *binding_freelist;
374 /* Append VAR to LIST in scope SCOPE. */
375 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
376 struct c_scope *s_ = (scope); \
378 if (s_->list##_last) \
379 BLOCK_CHAIN (s_->list##_last) = d_; \
382 s_->list##_last = d_; \
385 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
386 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
387 struct c_scope *t_ = (tscope); \
388 struct c_scope *f_ = (fscope); \
390 BLOCK_CHAIN (t_->to##_last) = f_->from; \
393 t_->to##_last = f_->from##_last; \
396 /* True means unconditionally make a BLOCK for the next scope pushed. */
398 static bool keep_next_level_flag;
400 /* True means the next call to push_scope will be the outermost scope
401 of a function body, so do not push a new scope, merely cease
402 expecting parameter decls. */
404 static bool next_is_function_body;
406 /* Forward declarations. */
407 static tree lookup_name_in_scope (tree, struct c_scope *);
408 static tree c_make_fname_decl (tree, int);
409 static tree grokdeclarator (const struct c_declarator *,
410 struct c_declspecs *,
411 enum decl_context, bool, tree *, tree *,
412 enum deprecated_states);
413 static tree grokparms (struct c_arg_info *, bool);
414 static void layout_array_type (tree);
416 /* T is a statement. Add it to the statement-tree. This is the
417 C/ObjC version--C++ has a slightly different version of this
423 enum tree_code code = TREE_CODE (t);
425 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
427 if (!EXPR_HAS_LOCATION (t))
428 SET_EXPR_LOCATION (t, input_location);
431 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
432 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
434 /* Add T to the statement-tree. Non-side-effect statements need to be
435 recorded during statement expressions. */
436 append_to_statement_list_force (t, &cur_stmt_list);
443 c_print_identifier (FILE *file, tree node, int indent)
445 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
446 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
447 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
448 if (C_IS_RESERVED_WORD (node))
450 tree rid = ridpointers[C_RID_CODE (node)];
451 indent_to (file, indent + 4);
452 fprintf (file, "rid %p \"%s\"",
453 (void *) rid, IDENTIFIER_POINTER (rid));
457 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
458 which may be any of several kinds of DECL or TYPE or error_mark_node,
459 in the scope SCOPE. */
461 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
463 struct c_binding *b, **here;
465 if (binding_freelist)
467 b = binding_freelist;
468 binding_freelist = b->prev;
471 b = GGC_NEW (struct c_binding);
476 b->depth = scope->depth;
477 b->invisible = invisible;
483 b->prev = scope->bindings;
489 switch (TREE_CODE (decl))
491 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
494 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
500 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
506 /* Locate the appropriate place in the chain of shadowed decls
507 to insert this binding. Normally, scope == current_scope and
508 this does nothing. */
509 while (*here && (*here)->depth > scope->depth)
510 here = &(*here)->shadowed;
516 /* Clear the binding structure B, stick it on the binding_freelist,
517 and return the former value of b->prev. This is used by pop_scope
518 and get_parm_info to iterate destructively over all the bindings
519 from a given scope. */
520 static struct c_binding *
521 free_binding_and_advance (struct c_binding *b)
523 struct c_binding *prev = b->prev;
525 memset (b, 0, sizeof (struct c_binding));
526 b->prev = binding_freelist;
527 binding_freelist = b;
533 /* Hook called at end of compilation to assume 1 elt
534 for a file-scope tentative array defn that wasn't complete before. */
537 c_finish_incomplete_decl (tree decl)
539 if (TREE_CODE (decl) == VAR_DECL)
541 tree type = TREE_TYPE (decl);
542 if (type != error_mark_node
543 && TREE_CODE (type) == ARRAY_TYPE
544 && !DECL_EXTERNAL (decl)
545 && TYPE_DOMAIN (type) == 0)
547 warning (0, "array %q+D assumed to have one element", decl);
549 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
551 layout_decl (decl, 0);
556 /* The Objective-C front-end often needs to determine the current scope. */
559 objc_get_current_scope (void)
561 return current_scope;
564 /* The following function is used only by Objective-C. It needs to live here
565 because it accesses the innards of c_scope. */
568 objc_mark_locals_volatile (void *enclosing_blk)
570 struct c_scope *scope;
573 for (scope = current_scope;
574 scope && scope != enclosing_blk;
575 scope = scope->outer)
577 for (b = scope->bindings; b; b = b->prev)
578 objc_volatilize_decl (b->decl);
580 /* Do not climb up past the current function. */
581 if (scope->function_body)
586 /* Nonzero if we are currently in file scope. */
589 global_bindings_p (void)
591 return current_scope == file_scope && !c_override_global_bindings_to_false;
595 keep_next_level (void)
597 keep_next_level_flag = true;
600 /* Identify this scope as currently being filled with parameters. */
603 declare_parm_level (void)
605 current_scope->parm_flag = true;
611 if (next_is_function_body)
613 /* This is the transition from the parameters to the top level
614 of the function body. These are the same scope
615 (C99 6.2.1p4,6) so we do not push another scope structure.
616 next_is_function_body is set only by store_parm_decls, which
617 in turn is called when and only when we are about to
618 encounter the opening curly brace for the function body.
620 The outermost block of a function always gets a BLOCK node,
621 because the debugging output routines expect that each
622 function has at least one BLOCK. */
623 current_scope->parm_flag = false;
624 current_scope->function_body = true;
625 current_scope->keep = true;
626 current_scope->outer_function = current_function_scope;
627 current_function_scope = current_scope;
629 keep_next_level_flag = false;
630 next_is_function_body = false;
634 struct c_scope *scope;
637 scope = scope_freelist;
638 scope_freelist = scope->outer;
641 scope = GGC_CNEW (struct c_scope);
643 scope->keep = keep_next_level_flag;
644 scope->outer = current_scope;
645 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
647 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
649 if (current_scope && scope->depth == 0)
652 sorry ("GCC supports only %u nested scopes", scope->depth);
655 current_scope = scope;
656 keep_next_level_flag = false;
660 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
663 set_type_context (tree type, tree context)
665 for (type = TYPE_MAIN_VARIANT (type); type;
666 type = TYPE_NEXT_VARIANT (type))
667 TYPE_CONTEXT (type) = context;
670 /* Exit a scope. Restore the state of the identifier-decl mappings
671 that were in effect when this scope was entered. Return a BLOCK
672 node containing all the DECLs in this scope that are of interest
673 to debug info generation. */
678 struct c_scope *scope = current_scope;
679 tree block, context, p;
682 bool functionbody = scope->function_body;
683 bool keep = functionbody || scope->keep || scope->bindings;
685 c_end_vm_scope (scope->depth);
687 /* If appropriate, create a BLOCK to record the decls for the life
692 block = make_node (BLOCK);
693 BLOCK_SUBBLOCKS (block) = scope->blocks;
694 TREE_USED (block) = 1;
696 /* In each subblock, record that this is its superior. */
697 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
698 BLOCK_SUPERCONTEXT (p) = block;
700 BLOCK_VARS (block) = 0;
703 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
704 scope must be set so that they point to the appropriate
705 construct, i.e. either to the current FUNCTION_DECL node, or
706 else to the BLOCK node we just constructed.
708 Note that for tagged types whose scope is just the formal
709 parameter list for some function type specification, we can't
710 properly set their TYPE_CONTEXTs here, because we don't have a
711 pointer to the appropriate FUNCTION_TYPE node readily available
712 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
713 type nodes get set in `grokdeclarator' as soon as we have created
714 the FUNCTION_TYPE node which will represent the "scope" for these
715 "parameter list local" tagged types. */
716 if (scope->function_body)
717 context = current_function_decl;
718 else if (scope == file_scope)
720 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
721 TREE_CHAIN (file_decl) = all_translation_units;
722 all_translation_units = file_decl;
728 /* Clear all bindings in this scope. */
729 for (b = scope->bindings; b; b = free_binding_and_advance (b))
732 switch (TREE_CODE (p))
735 /* Warnings for unused labels, errors for undefined labels. */
736 if (TREE_USED (p) && !DECL_INITIAL (p))
738 error ("label %q+D used but not defined", p);
739 DECL_INITIAL (p) = error_mark_node;
742 warn_for_unused_label (p);
744 /* Labels go in BLOCK_VARS. */
745 TREE_CHAIN (p) = BLOCK_VARS (block);
746 BLOCK_VARS (block) = p;
747 gcc_assert (I_LABEL_BINDING (b->id) == b);
748 I_LABEL_BINDING (b->id) = b->shadowed;
754 set_type_context (p, context);
756 /* Types may not have tag-names, in which case the type
757 appears in the bindings list with b->id NULL. */
760 gcc_assert (I_TAG_BINDING (b->id) == b);
761 I_TAG_BINDING (b->id) = b->shadowed;
766 /* Propagate TREE_ADDRESSABLE from nested functions to their
767 containing functions. */
768 if (!TREE_ASM_WRITTEN (p)
769 && DECL_INITIAL (p) != 0
770 && TREE_ADDRESSABLE (p)
771 && DECL_ABSTRACT_ORIGIN (p) != 0
772 && DECL_ABSTRACT_ORIGIN (p) != p)
773 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
774 if (!DECL_EXTERNAL (p)
776 && scope != file_scope
777 && scope != external_scope)
779 error ("nested function %q+D declared but never defined", p);
780 undef_nested_function = true;
782 /* C99 6.7.4p6: "a function with external linkage... declared
783 with an inline function specifier ... shall also be defined in the
784 same translation unit." */
785 else if (DECL_DECLARED_INLINE_P (p)
788 && !flag_gnu89_inline)
789 pedwarn ("inline function %q+D declared but never defined", p);
794 /* Warnings for unused variables. */
796 && !TREE_NO_WARNING (p)
797 && !DECL_IN_SYSTEM_HEADER (p)
799 && !DECL_ARTIFICIAL (p)
800 && scope != file_scope
801 && scope != external_scope)
802 warning (OPT_Wunused_variable, "unused variable %q+D", p);
806 error ("type of array %q+D completed incompatibly with"
807 " implicit initialization", p);
814 /* All of these go in BLOCK_VARS, but only if this is the
815 binding in the home scope. */
818 TREE_CHAIN (p) = BLOCK_VARS (block);
819 BLOCK_VARS (block) = p;
821 /* If this is the file scope, and we are processing more
822 than one translation unit in this compilation, set
823 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
824 This makes same_translation_unit_p work, and causes
825 static declarations to be given disambiguating suffixes. */
826 if (scope == file_scope && num_in_fnames > 1)
828 DECL_CONTEXT (p) = context;
829 if (TREE_CODE (p) == TYPE_DECL)
830 set_type_context (TREE_TYPE (p), context);
834 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
835 already been put there by store_parm_decls. Unused-
836 parameter warnings are handled by function.c.
837 error_mark_node obviously does not go in BLOCK_VARS and
838 does not get unused-variable warnings. */
841 /* It is possible for a decl not to have a name. We get
842 here with b->id NULL in this case. */
845 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
846 I_SYMBOL_BINDING (b->id) = b->shadowed;
847 if (b->shadowed && b->shadowed->type)
848 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
858 /* Dispose of the block that we just made inside some higher level. */
859 if ((scope->function_body || scope == file_scope) && context)
861 DECL_INITIAL (context) = block;
862 BLOCK_SUPERCONTEXT (block) = context;
864 else if (scope->outer)
867 SCOPE_LIST_APPEND (scope->outer, blocks, block);
868 /* If we did not make a block for the scope just exited, any
869 blocks made for inner scopes must be carried forward so they
870 will later become subblocks of something else. */
871 else if (scope->blocks)
872 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
875 /* Pop the current scope, and free the structure for reuse. */
876 current_scope = scope->outer;
877 if (scope->function_body)
878 current_function_scope = scope->outer_function;
880 memset (scope, 0, sizeof (struct c_scope));
881 scope->outer = scope_freelist;
882 scope_freelist = scope;
888 push_file_scope (void)
896 file_scope = current_scope;
898 start_fname_decls ();
900 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
901 bind (DECL_NAME (decl), decl, file_scope,
902 /*invisible=*/false, /*nested=*/true);
906 pop_file_scope (void)
908 /* In case there were missing closebraces, get us back to the global
910 while (current_scope != file_scope)
913 /* __FUNCTION__ is defined at file scope (""). This
914 call may not be necessary as my tests indicate it
915 still works without it. */
916 finish_fname_decls ();
918 /* This is the point to write out a PCH if we're doing that.
919 In that case we do not want to do anything else. */
922 c_common_write_pch ();
926 /* Pop off the file scope and close this translation unit. */
930 maybe_apply_pending_pragma_weaks ();
931 cgraph_finalize_compilation_unit ();
934 /* Insert BLOCK at the end of the list of subblocks of the current
935 scope. This is used when a BIND_EXPR is expanded, to handle the
936 BLOCK node inside the BIND_EXPR. */
939 insert_block (tree block)
941 TREE_USED (block) = 1;
942 SCOPE_LIST_APPEND (current_scope, blocks, block);
945 /* Push a definition or a declaration of struct, union or enum tag "name".
946 "type" should be the type node.
947 We assume that the tag "name" is not already defined.
949 Note that the definition may really be just a forward reference.
950 In that case, the TYPE_SIZE will be zero. */
953 pushtag (tree name, tree type)
955 /* Record the identifier as the type's name if it has none. */
956 if (name && !TYPE_NAME (type))
957 TYPE_NAME (type) = name;
958 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
960 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
961 tagged type we just added to the current scope. This fake
962 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
963 to output a representation of a tagged type, and it also gives
964 us a convenient place to record the "scope start" address for the
967 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
969 /* An approximation for now, so we can tell this is a function-scope tag.
970 This will be updated in pop_scope. */
971 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
974 /* Subroutine of compare_decls. Allow harmless mismatches in return
975 and argument types provided that the type modes match. This function
976 return a unified type given a suitable match, and 0 otherwise. */
979 match_builtin_function_types (tree newtype, tree oldtype)
981 tree newrettype, oldrettype;
982 tree newargs, oldargs;
983 tree trytype, tryargs;
985 /* Accept the return type of the new declaration if same modes. */
986 oldrettype = TREE_TYPE (oldtype);
987 newrettype = TREE_TYPE (newtype);
989 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
992 oldargs = TYPE_ARG_TYPES (oldtype);
993 newargs = TYPE_ARG_TYPES (newtype);
996 while (oldargs || newargs)
1000 || !TREE_VALUE (oldargs)
1001 || !TREE_VALUE (newargs)
1002 || TYPE_MODE (TREE_VALUE (oldargs))
1003 != TYPE_MODE (TREE_VALUE (newargs)))
1006 oldargs = TREE_CHAIN (oldargs);
1007 newargs = TREE_CHAIN (newargs);
1010 trytype = build_function_type (newrettype, tryargs);
1011 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1014 /* Subroutine of diagnose_mismatched_decls. Check for function type
1015 mismatch involving an empty arglist vs a nonempty one and give clearer
1018 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1019 tree newtype, tree oldtype)
1023 if (TREE_CODE (olddecl) != FUNCTION_DECL
1024 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1025 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1027 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1030 t = TYPE_ARG_TYPES (oldtype);
1032 t = TYPE_ARG_TYPES (newtype);
1033 for (; t; t = TREE_CHAIN (t))
1035 tree type = TREE_VALUE (t);
1037 if (TREE_CHAIN (t) == 0
1038 && TYPE_MAIN_VARIANT (type) != void_type_node)
1040 inform ("a parameter list with an ellipsis can%'t match "
1041 "an empty parameter name list declaration");
1045 if (c_type_promotes_to (type) != type)
1047 inform ("an argument type that has a default promotion can%'t match "
1048 "an empty parameter name list declaration");
1054 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1055 old-style function definition, NEWDECL is a prototype declaration.
1056 Diagnose inconsistencies in the argument list. Returns TRUE if
1057 the prototype is compatible, FALSE if not. */
1059 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1061 tree newargs, oldargs;
1064 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1066 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1067 newargs = TYPE_ARG_TYPES (newtype);
1072 tree oldargtype = TREE_VALUE (oldargs);
1073 tree newargtype = TREE_VALUE (newargs);
1075 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1078 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1079 newargtype = TYPE_MAIN_VARIANT (newargtype);
1081 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1084 /* Reaching the end of just one list means the two decls don't
1085 agree on the number of arguments. */
1086 if (END_OF_ARGLIST (oldargtype))
1088 error ("prototype for %q+D declares more arguments "
1089 "than previous old-style definition", newdecl);
1092 else if (END_OF_ARGLIST (newargtype))
1094 error ("prototype for %q+D declares fewer arguments "
1095 "than previous old-style definition", newdecl);
1099 /* Type for passing arg must be consistent with that declared
1101 else if (!comptypes (oldargtype, newargtype))
1103 error ("prototype for %q+D declares argument %d"
1104 " with incompatible type",
1109 oldargs = TREE_CHAIN (oldargs);
1110 newargs = TREE_CHAIN (newargs);
1114 /* If we get here, no errors were found, but do issue a warning
1115 for this poor-style construct. */
1116 warning (0, "prototype for %q+D follows non-prototype definition",
1119 #undef END_OF_ARGLIST
1122 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1123 first in a pair of mismatched declarations, using the diagnostic
1126 locate_old_decl (tree decl, void (*diag)(const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2))
1128 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1130 else if (DECL_INITIAL (decl))
1131 diag (G_("previous definition of %q+D was here"), decl);
1132 else if (C_DECL_IMPLICIT (decl))
1133 diag (G_("previous implicit declaration of %q+D was here"), decl);
1135 diag (G_("previous declaration of %q+D was here"), decl);
1138 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1139 Returns true if the caller should proceed to merge the two, false
1140 if OLDDECL should simply be discarded. As a side effect, issues
1141 all necessary diagnostics for invalid or poor-style combinations.
1142 If it returns true, writes the types of NEWDECL and OLDDECL to
1143 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1144 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1147 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1148 tree *newtypep, tree *oldtypep)
1150 tree newtype, oldtype;
1151 bool pedwarned = false;
1152 bool warned = false;
1155 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1156 && DECL_EXTERNAL (DECL))
1158 /* If we have error_mark_node for either decl or type, just discard
1159 the previous decl - we're in an error cascade already. */
1160 if (olddecl == error_mark_node || newdecl == error_mark_node)
1162 *oldtypep = oldtype = TREE_TYPE (olddecl);
1163 *newtypep = newtype = TREE_TYPE (newdecl);
1164 if (oldtype == error_mark_node || newtype == error_mark_node)
1167 /* Two different categories of symbol altogether. This is an error
1168 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1169 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1171 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1172 && DECL_BUILT_IN (olddecl)
1173 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1175 error ("%q+D redeclared as different kind of symbol", newdecl);
1176 locate_old_decl (olddecl, error);
1178 else if (TREE_PUBLIC (newdecl))
1179 warning (0, "built-in function %q+D declared as non-function",
1182 warning (OPT_Wshadow, "declaration of %q+D shadows "
1183 "a built-in function", newdecl);
1187 /* Enumerators have no linkage, so may only be declared once in a
1189 if (TREE_CODE (olddecl) == CONST_DECL)
1191 error ("redeclaration of enumerator %q+D", newdecl);
1192 locate_old_decl (olddecl, error);
1196 if (!comptypes (oldtype, newtype))
1198 if (TREE_CODE (olddecl) == FUNCTION_DECL
1199 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1201 /* Accept harmless mismatch in function types.
1202 This is for the ffs and fprintf builtins. */
1203 tree trytype = match_builtin_function_types (newtype, oldtype);
1205 if (trytype && comptypes (newtype, trytype))
1206 *oldtypep = oldtype = trytype;
1209 /* If types don't match for a built-in, throw away the
1210 built-in. No point in calling locate_old_decl here, it
1211 won't print anything. */
1212 warning (0, "conflicting types for built-in function %q+D",
1217 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1218 && DECL_IS_BUILTIN (olddecl))
1220 /* A conflicting function declaration for a predeclared
1221 function that isn't actually built in. Objective C uses
1222 these. The new declaration silently overrides everything
1223 but the volatility (i.e. noreturn) indication. See also
1224 below. FIXME: Make Objective C use normal builtins. */
1225 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1228 /* Permit void foo (...) to match int foo (...) if the latter is
1229 the definition and implicit int was used. See
1230 c-torture/compile/920625-2.c. */
1231 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1232 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1233 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1234 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1236 pedwarn ("conflicting types for %q+D", newdecl);
1237 /* Make sure we keep void as the return type. */
1238 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1239 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1242 /* Permit void foo (...) to match an earlier call to foo (...) with
1243 no declared type (thus, implicitly int). */
1244 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1245 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1246 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1247 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1249 pedwarn ("conflicting types for %q+D", newdecl);
1250 /* Make sure we keep void as the return type. */
1251 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1256 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1257 error ("conflicting type qualifiers for %q+D", newdecl);
1259 error ("conflicting types for %q+D", newdecl);
1260 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1261 locate_old_decl (olddecl, error);
1266 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1267 but silently ignore the redeclaration if either is in a system
1268 header. (Conflicting redeclarations were handled above.) */
1269 if (TREE_CODE (newdecl) == TYPE_DECL)
1271 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1272 return true; /* Allow OLDDECL to continue in use. */
1274 error ("redefinition of typedef %q+D", newdecl);
1275 locate_old_decl (olddecl, error);
1279 /* Function declarations can either be 'static' or 'extern' (no
1280 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1281 can never conflict with each other on account of linkage
1282 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1283 gnu89 mode permits two definitions if one is 'extern inline' and
1284 one is not. The non- extern-inline definition supersedes the
1285 extern-inline definition. */
1287 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1289 /* If you declare a built-in function name as static, or
1290 define the built-in with an old-style definition (so we
1291 can't validate the argument list) the built-in definition is
1292 overridden, but optionally warn this was a bad choice of name. */
1293 if (DECL_BUILT_IN (olddecl)
1294 && !C_DECL_DECLARED_BUILTIN (olddecl)
1295 && (!TREE_PUBLIC (newdecl)
1296 || (DECL_INITIAL (newdecl)
1297 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1299 warning (OPT_Wshadow, "declaration of %q+D shadows "
1300 "a built-in function", newdecl);
1301 /* Discard the old built-in function. */
1305 if (DECL_INITIAL (newdecl))
1307 if (DECL_INITIAL (olddecl))
1309 /* If both decls are in the same TU and the new declaration
1310 isn't overriding an extern inline reject the new decl.
1311 In c99, no overriding is allowed in the same translation
1313 if ((!DECL_EXTERN_INLINE (olddecl)
1314 || DECL_EXTERN_INLINE (newdecl)
1315 || (!flag_gnu89_inline
1316 && (!DECL_DECLARED_INLINE_P (olddecl)
1317 || !lookup_attribute ("gnu_inline",
1318 DECL_ATTRIBUTES (olddecl)))
1319 && (!DECL_DECLARED_INLINE_P (newdecl)
1320 || !lookup_attribute ("gnu_inline",
1321 DECL_ATTRIBUTES (newdecl))))
1323 && same_translation_unit_p (newdecl, olddecl))
1325 error ("redefinition of %q+D", newdecl);
1326 locate_old_decl (olddecl, error);
1331 /* If we have a prototype after an old-style function definition,
1332 the argument types must be checked specially. */
1333 else if (DECL_INITIAL (olddecl)
1334 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1335 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1336 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1338 locate_old_decl (olddecl, error);
1341 /* A non-static declaration (even an "extern") followed by a
1342 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1343 The same is true for a static forward declaration at block
1344 scope followed by a non-static declaration/definition at file
1345 scope. Static followed by non-static at the same scope is
1346 not undefined behavior, and is the most convenient way to get
1347 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1348 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1349 we do diagnose it if -Wtraditional. */
1350 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1352 /* Two exceptions to the rule. If olddecl is an extern
1353 inline, or a predeclared function that isn't actually
1354 built in, newdecl silently overrides olddecl. The latter
1355 occur only in Objective C; see also above. (FIXME: Make
1356 Objective C use normal builtins.) */
1357 if (!DECL_IS_BUILTIN (olddecl)
1358 && !DECL_EXTERN_INLINE (olddecl))
1360 error ("static declaration of %q+D follows "
1361 "non-static declaration", newdecl);
1362 locate_old_decl (olddecl, error);
1366 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1368 if (DECL_CONTEXT (olddecl))
1370 error ("non-static declaration of %q+D follows "
1371 "static declaration", newdecl);
1372 locate_old_decl (olddecl, error);
1375 else if (warn_traditional)
1377 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1378 "follows static declaration", newdecl);
1383 /* Make sure gnu_inline attribute is either not present, or
1384 present on all inline decls. */
1385 if (DECL_DECLARED_INLINE_P (olddecl)
1386 && DECL_DECLARED_INLINE_P (newdecl))
1388 bool newa = lookup_attribute ("gnu_inline",
1389 DECL_ATTRIBUTES (newdecl)) != NULL;
1390 bool olda = lookup_attribute ("gnu_inline",
1391 DECL_ATTRIBUTES (olddecl)) != NULL;
1394 error ("%<gnu_inline%> attribute present on %q+D",
1395 newa ? newdecl : olddecl);
1396 error ("%Jbut not here", newa ? olddecl : newdecl);
1400 else if (TREE_CODE (newdecl) == VAR_DECL)
1402 /* Only variables can be thread-local, and all declarations must
1403 agree on this property. */
1404 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1406 /* Nothing to check. Since OLDDECL is marked threadprivate
1407 and NEWDECL does not have a thread-local attribute, we
1408 will merge the threadprivate attribute into NEWDECL. */
1411 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1413 if (DECL_THREAD_LOCAL_P (newdecl))
1414 error ("thread-local declaration of %q+D follows "
1415 "non-thread-local declaration", newdecl);
1417 error ("non-thread-local declaration of %q+D follows "
1418 "thread-local declaration", newdecl);
1420 locate_old_decl (olddecl, error);
1424 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1425 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1427 error ("redefinition of %q+D", newdecl);
1428 locate_old_decl (olddecl, error);
1432 /* Objects declared at file scope: if the first declaration had
1433 external linkage (even if it was an external reference) the
1434 second must have external linkage as well, or the behavior is
1435 undefined. If the first declaration had internal linkage, then
1436 the second must too, or else be an external reference (in which
1437 case the composite declaration still has internal linkage).
1438 As for function declarations, we warn about the static-then-
1439 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1440 if (DECL_FILE_SCOPE_P (newdecl)
1441 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1443 if (DECL_EXTERNAL (newdecl))
1445 if (!DECL_FILE_SCOPE_P (olddecl))
1447 error ("extern declaration of %q+D follows "
1448 "declaration with no linkage", newdecl);
1449 locate_old_decl (olddecl, error);
1452 else if (warn_traditional)
1454 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1455 "follows static declaration", newdecl);
1461 if (TREE_PUBLIC (newdecl))
1462 error ("non-static declaration of %q+D follows "
1463 "static declaration", newdecl);
1465 error ("static declaration of %q+D follows "
1466 "non-static declaration", newdecl);
1468 locate_old_decl (olddecl, error);
1472 /* Two objects with the same name declared at the same block
1473 scope must both be external references (6.7p3). */
1474 else if (!DECL_FILE_SCOPE_P (newdecl))
1476 if (DECL_EXTERNAL (newdecl))
1478 /* Extern with initializer at block scope, which will
1479 already have received an error. */
1481 else if (DECL_EXTERNAL (olddecl))
1483 error ("declaration of %q+D with no linkage follows "
1484 "extern declaration", newdecl);
1485 locate_old_decl (olddecl, error);
1489 error ("redeclaration of %q+D with no linkage", newdecl);
1490 locate_old_decl (olddecl, error);
1498 /* All decls must agree on a visibility. */
1499 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
1500 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1501 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1503 warning (0, "redeclaration of %q+D with different visibility "
1504 "(old visibility preserved)", newdecl);
1508 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1510 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1511 if (DECL_DECLARED_INLINE_P (newdecl)
1512 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1514 warning (OPT_Wattributes, "inline declaration of %qD follows "
1515 "declaration with attribute noinline", newdecl);
1518 else if (DECL_DECLARED_INLINE_P (olddecl)
1519 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1521 warning (OPT_Wattributes, "declaration of %q+D with attribute "
1522 "noinline follows inline declaration ", newdecl);
1526 /* Inline declaration after use or definition.
1527 ??? Should we still warn about this now we have unit-at-a-time
1528 mode and can get it right?
1529 Definitely don't complain if the decls are in different translation
1531 C99 permits this, so don't warn in that case. (The function
1532 may not be inlined everywhere in function-at-a-time mode, but
1533 we still shouldn't warn.) */
1534 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1535 && same_translation_unit_p (olddecl, newdecl)
1536 && flag_gnu89_inline)
1538 if (TREE_USED (olddecl))
1540 warning (0, "%q+D declared inline after being called", olddecl);
1543 else if (DECL_INITIAL (olddecl))
1545 warning (0, "%q+D declared inline after its definition", olddecl);
1550 else /* PARM_DECL, VAR_DECL */
1552 /* Redeclaration of a parameter is a constraint violation (this is
1553 not explicitly stated, but follows from C99 6.7p3 [no more than
1554 one declaration of the same identifier with no linkage in the
1555 same scope, except type tags] and 6.2.2p6 [parameters have no
1556 linkage]). We must check for a forward parameter declaration,
1557 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1558 an extension, the mandatory diagnostic for which is handled by
1559 mark_forward_parm_decls. */
1561 if (TREE_CODE (newdecl) == PARM_DECL
1562 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1564 error ("redefinition of parameter %q+D", newdecl);
1565 locate_old_decl (olddecl, error);
1570 /* Optional warning for completely redundant decls. */
1571 if (!warned && !pedwarned
1572 && warn_redundant_decls
1573 /* Don't warn about a function declaration followed by a
1575 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1576 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1577 /* Don't warn about redundant redeclarations of builtins. */
1578 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1579 && !DECL_BUILT_IN (newdecl)
1580 && DECL_BUILT_IN (olddecl)
1581 && !C_DECL_DECLARED_BUILTIN (olddecl))
1582 /* Don't warn about an extern followed by a definition. */
1583 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1584 /* Don't warn about forward parameter decls. */
1585 && !(TREE_CODE (newdecl) == PARM_DECL
1586 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1587 /* Don't warn about a variable definition following a declaration. */
1588 && !(TREE_CODE (newdecl) == VAR_DECL
1589 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
1591 warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
1596 /* Report location of previous decl/defn in a consistent manner. */
1597 if (warned || pedwarned)
1598 locate_old_decl (olddecl, pedwarned ? pedwarn : warning0);
1600 #undef DECL_EXTERN_INLINE
1605 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1606 consistent with OLDDECL, but carries new information. Merge the
1607 new information into OLDDECL. This function issues no
1611 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1613 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1614 && DECL_INITIAL (newdecl) != 0);
1615 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
1616 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
1617 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
1618 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
1619 bool extern_changed = false;
1621 /* For real parm decl following a forward decl, rechain the old decl
1622 in its new location and clear TREE_ASM_WRITTEN (it's not a
1623 forward decl anymore). */
1624 if (TREE_CODE (newdecl) == PARM_DECL
1625 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1627 struct c_binding *b, **here;
1629 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1630 if ((*here)->decl == olddecl)
1637 b->prev = current_scope->bindings;
1638 current_scope->bindings = b;
1640 TREE_ASM_WRITTEN (olddecl) = 0;
1643 DECL_ATTRIBUTES (newdecl)
1644 = targetm.merge_decl_attributes (olddecl, newdecl);
1646 /* Merge the data types specified in the two decls. */
1648 = TREE_TYPE (olddecl)
1649 = composite_type (newtype, oldtype);
1651 /* Lay the type out, unless already done. */
1652 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1654 if (TREE_TYPE (newdecl) != error_mark_node)
1655 layout_type (TREE_TYPE (newdecl));
1656 if (TREE_CODE (newdecl) != FUNCTION_DECL
1657 && TREE_CODE (newdecl) != TYPE_DECL
1658 && TREE_CODE (newdecl) != CONST_DECL)
1659 layout_decl (newdecl, 0);
1663 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1664 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1665 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1666 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1667 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1669 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1670 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1674 /* Keep the old rtl since we can safely use it. */
1675 if (HAS_RTL_P (olddecl))
1676 COPY_DECL_RTL (olddecl, newdecl);
1678 /* Merge the type qualifiers. */
1679 if (TREE_READONLY (newdecl))
1680 TREE_READONLY (olddecl) = 1;
1682 if (TREE_THIS_VOLATILE (newdecl))
1683 TREE_THIS_VOLATILE (olddecl) = 1;
1685 /* Merge deprecatedness. */
1686 if (TREE_DEPRECATED (newdecl))
1687 TREE_DEPRECATED (olddecl) = 1;
1689 /* Keep source location of definition rather than declaration and of
1690 prototype rather than non-prototype unless that prototype is
1692 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1693 || (old_is_prototype && !new_is_prototype
1694 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1695 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1697 /* Merge the initialization information. */
1698 if (DECL_INITIAL (newdecl) == 0)
1699 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1701 /* Merge the threadprivate attribute. */
1702 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
1704 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1705 C_DECL_THREADPRIVATE_P (newdecl) = 1;
1708 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1710 /* Merge the unused-warning information. */
1711 if (DECL_IN_SYSTEM_HEADER (olddecl))
1712 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1713 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1714 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1716 /* Merge the section attribute.
1717 We want to issue an error if the sections conflict but that
1718 must be done later in decl_attributes since we are called
1719 before attributes are assigned. */
1720 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1721 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1723 /* Copy the assembler name.
1724 Currently, it can only be defined in the prototype. */
1725 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1727 /* Use visibility of whichever declaration had it specified */
1728 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1730 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1731 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1734 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1736 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1737 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1738 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1739 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1740 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1741 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1742 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1743 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1744 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1745 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1746 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1749 /* Merge the storage class information. */
1750 merge_weak (newdecl, olddecl);
1752 /* For functions, static overrides non-static. */
1753 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1755 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1756 /* This is since we don't automatically
1757 copy the attributes of NEWDECL into OLDDECL. */
1758 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1759 /* If this clears `static', clear it in the identifier too. */
1760 if (!TREE_PUBLIC (olddecl))
1761 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1765 /* In c99, 'extern' declaration before (or after) 'inline' means this
1766 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1768 if (TREE_CODE (newdecl) == FUNCTION_DECL
1769 && !flag_gnu89_inline
1770 && (DECL_DECLARED_INLINE_P (newdecl)
1771 || DECL_DECLARED_INLINE_P (olddecl))
1772 && (!DECL_DECLARED_INLINE_P (newdecl)
1773 || !DECL_DECLARED_INLINE_P (olddecl)
1774 || !DECL_EXTERNAL (olddecl))
1775 && DECL_EXTERNAL (newdecl)
1776 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl)))
1777 DECL_EXTERNAL (newdecl) = 0;
1779 if (DECL_EXTERNAL (newdecl))
1781 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1782 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1784 /* An extern decl does not override previous storage class. */
1785 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1786 if (!DECL_EXTERNAL (newdecl))
1788 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1789 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1794 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1795 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1798 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1800 /* If we're redefining a function previously defined as extern
1801 inline, make sure we emit debug info for the inline before we
1802 throw it away, in case it was inlined into a function that
1803 hasn't been written out yet. */
1804 if (new_is_definition && DECL_INITIAL (olddecl))
1806 if (TREE_USED (olddecl)
1807 /* In unit-at-a-time mode we never inline re-defined extern
1808 inline functions. */
1809 && !flag_unit_at_a_time
1810 && cgraph_function_possibly_inlined_p (olddecl))
1811 (*debug_hooks->outlining_inline_function) (olddecl);
1813 /* The new defn must not be inline. */
1814 DECL_INLINE (newdecl) = 0;
1815 DECL_UNINLINABLE (newdecl) = 1;
1819 /* If either decl says `inline', this fn is inline, unless
1820 its definition was passed already. */
1821 if (DECL_DECLARED_INLINE_P (newdecl)
1822 || DECL_DECLARED_INLINE_P (olddecl))
1823 DECL_DECLARED_INLINE_P (newdecl) = 1;
1825 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1826 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1828 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1829 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1830 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1831 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1834 if (DECL_BUILT_IN (olddecl))
1836 /* If redeclaring a builtin function, it stays built in.
1837 But it gets tagged as having been declared. */
1838 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1839 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1840 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1841 if (new_is_prototype)
1842 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1844 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1845 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1848 /* Also preserve various other info from the definition. */
1849 if (!new_is_definition)
1851 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1852 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1853 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1854 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1855 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1857 /* Set DECL_INLINE on the declaration if we've got a body
1858 from which to instantiate. */
1859 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1861 DECL_INLINE (newdecl) = 1;
1862 DECL_ABSTRACT_ORIGIN (newdecl)
1863 = DECL_ABSTRACT_ORIGIN (olddecl);
1868 /* If a previous declaration said inline, mark the
1869 definition as inlinable. */
1870 if (DECL_DECLARED_INLINE_P (newdecl)
1871 && !DECL_UNINLINABLE (newdecl))
1872 DECL_INLINE (newdecl) = 1;
1876 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
1878 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1879 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1881 unsigned olddecl_uid = DECL_UID (olddecl);
1882 tree olddecl_context = DECL_CONTEXT (olddecl);
1884 memcpy ((char *) olddecl + sizeof (struct tree_common),
1885 (char *) newdecl + sizeof (struct tree_common),
1886 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1887 switch (TREE_CODE (olddecl))
1897 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1898 (char *) newdecl + sizeof (struct tree_decl_common),
1899 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1904 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1905 (char *) newdecl + sizeof (struct tree_decl_common),
1906 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1908 DECL_UID (olddecl) = olddecl_uid;
1909 DECL_CONTEXT (olddecl) = olddecl_context;
1912 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1913 so that encode_section_info has a chance to look at the new decl
1914 flags and attributes. */
1915 if (DECL_RTL_SET_P (olddecl)
1916 && (TREE_CODE (olddecl) == FUNCTION_DECL
1917 || (TREE_CODE (olddecl) == VAR_DECL
1918 && TREE_STATIC (olddecl))))
1919 make_decl_rtl (olddecl);
1921 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1922 and the definition is coming from the old version, cgraph needs
1923 to be called again. */
1924 if (extern_changed && !new_is_definition
1925 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
1926 cgraph_finalize_function (olddecl, false);
1929 /* Handle when a new declaration NEWDECL has the same name as an old
1930 one OLDDECL in the same binding contour. Prints an error message
1933 If safely possible, alter OLDDECL to look like NEWDECL, and return
1934 true. Otherwise, return false. */
1937 duplicate_decls (tree newdecl, tree olddecl)
1939 tree newtype = NULL, oldtype = NULL;
1941 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1943 /* Avoid `unused variable' and other warnings for OLDDECL. */
1944 TREE_NO_WARNING (olddecl) = 1;
1948 merge_decls (newdecl, olddecl, newtype, oldtype);
1953 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1955 warn_if_shadowing (tree new_decl)
1957 struct c_binding *b;
1959 /* Shadow warnings wanted? */
1961 /* No shadow warnings for internally generated vars. */
1962 || DECL_IS_BUILTIN (new_decl)
1963 /* No shadow warnings for vars made for inlining. */
1964 || DECL_FROM_INLINE (new_decl))
1967 /* Is anything being shadowed? Invisible decls do not count. */
1968 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1969 if (b->decl && b->decl != new_decl && !b->invisible)
1971 tree old_decl = b->decl;
1973 if (old_decl == error_mark_node)
1975 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1976 "non-variable", new_decl);
1979 else if (TREE_CODE (old_decl) == PARM_DECL)
1980 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
1982 else if (DECL_FILE_SCOPE_P (old_decl))
1983 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
1984 "declaration", new_decl);
1985 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1986 && DECL_BUILT_IN (old_decl))
1988 warning (OPT_Wshadow, "declaration of %q+D shadows "
1989 "a built-in function", new_decl);
1993 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
1996 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
2003 /* Subroutine of pushdecl.
2005 X is a TYPE_DECL for a typedef statement. Create a brand new
2006 ..._TYPE node (which will be just a variant of the existing
2007 ..._TYPE node with identical properties) and then install X
2008 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2010 The whole point here is to end up with a situation where each
2011 and every ..._TYPE node the compiler creates will be uniquely
2012 associated with AT MOST one node representing a typedef name.
2013 This way, even though the compiler substitutes corresponding
2014 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2015 early on, later parts of the compiler can always do the reverse
2016 translation and get back the corresponding typedef name. For
2019 typedef struct S MY_TYPE;
2022 Later parts of the compiler might only know that `object' was of
2023 type `struct S' if it were not for code just below. With this
2024 code however, later parts of the compiler see something like:
2026 struct S' == struct S
2027 typedef struct S' MY_TYPE;
2030 And they can then deduce (from the node for type struct S') that
2031 the original object declaration was:
2035 Being able to do this is important for proper support of protoize,
2036 and also for generating precise symbolic debugging information
2037 which takes full account of the programmer's (typedef) vocabulary.
2039 Obviously, we don't want to generate a duplicate ..._TYPE node if
2040 the TYPE_DECL node that we are now processing really represents a
2041 standard built-in type. */
2044 clone_underlying_type (tree x)
2046 if (DECL_IS_BUILTIN (x))
2048 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2049 TYPE_NAME (TREE_TYPE (x)) = x;
2051 else if (TREE_TYPE (x) != error_mark_node
2052 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2054 tree tt = TREE_TYPE (x);
2055 DECL_ORIGINAL_TYPE (x) = tt;
2056 tt = build_variant_type_copy (tt);
2058 TREE_USED (tt) = TREE_USED (x);
2063 /* Record a decl-node X as belonging to the current lexical scope.
2064 Check for errors (such as an incompatible declaration for the same
2065 name already seen in the same scope).
2067 Returns either X or an old decl for the same name.
2068 If an old decl is returned, it may have been smashed
2069 to agree with what X says. */
2074 tree name = DECL_NAME (x);
2075 struct c_scope *scope = current_scope;
2076 struct c_binding *b;
2077 bool nested = false;
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 (CONST_CAST (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 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2852 /* Should never be called on a symbol with a preexisting meaning. */
2853 gcc_assert (!I_SYMBOL_BINDING (id));
2855 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2857 /* Builtins in the implementation namespace are made visible without
2858 needing to be explicitly declared. See push_file_scope. */
2859 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2861 TREE_CHAIN (decl) = visible_builtins;
2862 visible_builtins = decl;
2868 /* Called when a declaration is seen that contains no names to declare.
2869 If its type is a reference to a structure, union or enum inherited
2870 from a containing scope, shadow that tag name for the current scope
2871 with a forward reference.
2872 If its type defines a new named structure or union
2873 or defines an enum, it is valid but we need not do anything here.
2874 Otherwise, it is an error. */
2877 shadow_tag (const struct c_declspecs *declspecs)
2879 shadow_tag_warned (declspecs, 0);
2882 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2885 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2887 bool found_tag = false;
2889 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2891 tree value = declspecs->type;
2892 enum tree_code code = TREE_CODE (value);
2894 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2895 /* Used to test also that TYPE_SIZE (value) != 0.
2896 That caused warning for `struct foo;' at top level in the file. */
2898 tree name = TYPE_NAME (value);
2905 if (warned != 1 && code != ENUMERAL_TYPE)
2906 /* Empty unnamed enum OK */
2908 pedwarn ("unnamed struct/union that defines no instances");
2912 else if (!declspecs->tag_defined_p
2913 && declspecs->storage_class != csc_none)
2916 pedwarn ("empty declaration with storage class specifier "
2917 "does not redeclare tag");
2919 pending_xref_error ();
2921 else if (!declspecs->tag_defined_p
2922 && (declspecs->const_p
2923 || declspecs->volatile_p
2924 || declspecs->restrict_p))
2927 pedwarn ("empty declaration with type qualifier "
2928 "does not redeclare tag");
2930 pending_xref_error ();
2934 pending_invalid_xref = 0;
2935 t = lookup_tag (code, name, 1);
2939 t = make_node (code);
2946 if (warned != 1 && !in_system_header)
2948 pedwarn ("useless type name in empty declaration");
2953 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2955 pedwarn ("useless type name in empty declaration");
2959 pending_invalid_xref = 0;
2961 if (declspecs->inline_p)
2963 error ("%<inline%> in empty declaration");
2967 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2969 error ("%<auto%> in file-scope empty declaration");
2973 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2975 error ("%<register%> in file-scope empty declaration");
2979 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2981 warning (0, "useless storage class specifier in empty declaration");
2985 if (!warned && !in_system_header && declspecs->thread_p)
2987 warning (0, "useless %<__thread%> in empty declaration");
2991 if (!warned && !in_system_header && (declspecs->const_p
2992 || declspecs->volatile_p
2993 || declspecs->restrict_p))
2995 warning (0, "useless type qualifier in empty declaration");
3002 pedwarn ("empty declaration");
3007 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3008 bits. SPECS represents declaration specifiers that the grammar
3009 only permits to contain type qualifiers and attributes. */
3012 quals_from_declspecs (const struct c_declspecs *specs)
3014 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3015 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3016 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
3017 gcc_assert (!specs->type
3018 && !specs->decl_attr
3019 && specs->typespec_word == cts_none
3020 && specs->storage_class == csc_none
3021 && !specs->typedef_p
3022 && !specs->explicit_signed_p
3023 && !specs->deprecated_p
3025 && !specs->long_long_p
3028 && !specs->unsigned_p
3029 && !specs->complex_p
3031 && !specs->thread_p);
3035 /* Construct an array declarator. EXPR is the expression inside [],
3036 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3037 applied to the pointer to which a parameter array is converted).
3038 STATIC_P is true if "static" is inside the [], false otherwise.
3039 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3040 length which is nevertheless a complete type, false otherwise. The
3041 field for the contained declarator is left to be filled in by
3042 set_array_declarator_inner. */
3044 struct c_declarator *
3045 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3048 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3049 struct c_declarator);
3050 declarator->kind = cdk_array;
3051 declarator->declarator = 0;
3052 declarator->u.array.dimen = expr;
3055 declarator->u.array.attrs = quals->attrs;
3056 declarator->u.array.quals = quals_from_declspecs (quals);
3060 declarator->u.array.attrs = NULL_TREE;
3061 declarator->u.array.quals = 0;
3063 declarator->u.array.static_p = static_p;
3064 declarator->u.array.vla_unspec_p = vla_unspec_p;
3065 if (pedantic && !flag_isoc99)
3067 if (static_p || quals != NULL)
3068 pedwarn ("ISO C90 does not support %<static%> or type "
3069 "qualifiers in parameter array declarators");
3071 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3075 if (!current_scope->parm_flag)
3078 error ("%<[*]%> not allowed in other than function prototype scope");
3079 declarator->u.array.vla_unspec_p = false;
3082 current_scope->had_vla_unspec = true;
3087 /* Set the contained declarator of an array declarator. DECL is the
3088 declarator, as constructed by build_array_declarator; INNER is what
3089 appears on the left of the []. */
3091 struct c_declarator *
3092 set_array_declarator_inner (struct c_declarator *decl,
3093 struct c_declarator *inner)
3095 decl->declarator = inner;
3099 /* INIT is a constructor that forms DECL's initializer. If the final
3100 element initializes a flexible array field, add the size of that
3101 initializer to DECL's size. */
3104 add_flexible_array_elts_to_size (tree decl, tree init)
3108 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3111 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3112 type = TREE_TYPE (elt);
3113 if (TREE_CODE (type) == ARRAY_TYPE
3114 && TYPE_SIZE (type) == NULL_TREE
3115 && TYPE_DOMAIN (type) != NULL_TREE
3116 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3118 complete_array_type (&type, elt, false);
3120 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3121 DECL_SIZE_UNIT (decl)
3122 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3126 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3129 groktypename (struct c_type_name *type_name)
3132 tree attrs = type_name->specs->attrs;
3134 type_name->specs->attrs = NULL_TREE;
3136 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3137 false, NULL, &attrs, DEPRECATED_NORMAL);
3139 /* Apply attributes. */
3140 decl_attributes (&type, attrs, 0);
3145 /* Decode a declarator in an ordinary declaration or data definition.
3146 This is called as soon as the type information and variable name
3147 have been parsed, before parsing the initializer if any.
3148 Here we create the ..._DECL node, fill in its type,
3149 and put it on the list of decls for the current context.
3150 The ..._DECL node is returned as the value.
3152 Exception: for arrays where the length is not specified,
3153 the type is left null, to be filled in by `finish_decl'.
3155 Function definitions do not come here; they go to start_function
3156 instead. However, external and forward declarations of functions
3157 do go through here. Structure field declarations are done by
3158 grokfield and not through here. */
3161 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3162 bool initialized, tree attributes)
3166 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
3168 /* An object declared as __attribute__((deprecated)) suppresses
3169 warnings of uses of other deprecated items. */
3170 if (lookup_attribute ("deprecated", attributes))
3171 deprecated_state = DEPRECATED_SUPPRESS;
3173 decl = grokdeclarator (declarator, declspecs,
3174 NORMAL, initialized, NULL, &attributes,
3179 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3180 && MAIN_NAME_P (DECL_NAME (decl)))
3181 warning (OPT_Wmain, "%q+D is usually a function", decl);
3184 /* Is it valid for this decl to have an initializer at all?
3185 If not, set INITIALIZED to zero, which will indirectly
3186 tell 'finish_decl' to ignore the initializer once it is parsed. */
3187 switch (TREE_CODE (decl))
3190 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3195 error ("function %qD is initialized like a variable", decl);
3200 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3201 error ("parameter %qD is initialized", decl);
3206 /* Don't allow initializations for incomplete types except for
3207 arrays which might be completed by the initialization. */
3209 /* This can happen if the array size is an undefined macro.
3210 We already gave a warning, so we don't need another one. */
3211 if (TREE_TYPE (decl) == error_mark_node)
3213 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3215 /* A complete type is ok if size is fixed. */
3217 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3218 || C_DECL_VARIABLE_SIZE (decl))
3220 error ("variable-sized object may not be initialized");
3224 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3226 error ("variable %qD has initializer but incomplete type", decl);
3229 else if (C_DECL_VARIABLE_SIZE (decl))
3231 /* Although C99 is unclear about whether incomplete arrays
3232 of VLAs themselves count as VLAs, it does not make
3233 sense to permit them to be initialized given that
3234 ordinary VLAs may not be initialized. */
3235 error ("variable-sized object may not be initialized");
3242 if (current_scope == file_scope)
3243 TREE_STATIC (decl) = 1;
3245 /* Tell 'pushdecl' this is an initialized decl
3246 even though we don't yet have the initializer expression.
3247 Also tell 'finish_decl' it may store the real initializer. */
3248 DECL_INITIAL (decl) = error_mark_node;
3251 /* If this is a function declaration, write a record describing it to the
3252 prototypes file (if requested). */
3254 if (TREE_CODE (decl) == FUNCTION_DECL)
3255 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3257 /* ANSI specifies that a tentative definition which is not merged with
3258 a non-tentative definition behaves exactly like a definition with an
3259 initializer equal to zero. (Section 3.7.2)
3261 -fno-common gives strict ANSI behavior, though this tends to break
3262 a large body of code that grew up without this rule.
3264 Thread-local variables are never common, since there's no entrenched
3265 body of code to break, and it allows more efficient variable references
3266 in the presence of dynamic linking. */
3268 if (TREE_CODE (decl) == VAR_DECL
3270 && TREE_PUBLIC (decl)
3271 && !DECL_THREAD_LOCAL_P (decl)
3273 DECL_COMMON (decl) = 1;
3275 /* Set attributes here so if duplicate decl, will have proper attributes. */
3276 decl_attributes (&decl, attributes, 0);
3278 /* Handle gnu_inline attribute. */
3279 if (declspecs->inline_p
3280 && !flag_gnu89_inline
3281 && TREE_CODE (decl) == FUNCTION_DECL
3282 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl)))
3284 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
3286 else if (declspecs->storage_class != csc_static)
3287 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
3290 if (TREE_CODE (decl) == FUNCTION_DECL
3291 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3293 struct c_declarator *ce = declarator;
3295 if (ce->kind == cdk_pointer)
3296 ce = declarator->declarator;
3297 if (ce->kind == cdk_function)
3299 tree args = ce->u.arg_info->parms;
3300 for (; args; args = TREE_CHAIN (args))
3302 tree type = TREE_TYPE (args);
3303 if (type && INTEGRAL_TYPE_P (type)
3304 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3305 DECL_ARG_TYPE (args) = integer_type_node;
3310 if (TREE_CODE (decl) == FUNCTION_DECL
3311 && DECL_DECLARED_INLINE_P (decl)
3312 && DECL_UNINLINABLE (decl)
3313 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3314 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3317 /* C99 6.7.4p3: An inline definition of a function with external
3318 linkage shall not contain a definition of a modifiable object
3319 with static storage duration... */
3320 if (TREE_CODE (decl) == VAR_DECL
3321 && current_scope != file_scope
3322 && TREE_STATIC (decl)
3323 && !TREE_READONLY (decl)
3324 && DECL_DECLARED_INLINE_P (current_function_decl)
3325 && DECL_EXTERNAL (current_function_decl))
3326 pedwarn ("%q+D is static but declared in inline function %qD "
3327 "which is not static", decl, current_function_decl);
3329 /* Add this decl to the current scope.
3330 TEM may equal DECL or it may be a previous decl of the same name. */
3331 tem = pushdecl (decl);
3333 if (initialized && DECL_EXTERNAL (tem))
3335 DECL_EXTERNAL (tem) = 0;
3336 TREE_STATIC (tem) = 1;
3342 /* Initialize EH if not initialized yet and exceptions are enabled. */
3345 c_maybe_initialize_eh (void)
3347 if (!flag_exceptions || c_eh_initialized_p)
3350 c_eh_initialized_p = true;
3351 eh_personality_libfunc
3352 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3353 ? "__gcc_personality_sj0"
3354 : "__gcc_personality_v0");
3355 default_init_unwind_resume_libfunc ();
3356 using_eh_for_cleanups ();
3359 /* Finish processing of a declaration;
3360 install its initial value.
3361 If the length of an array type is not known before,
3362 it must be determined now, from the initial value, or it is an error. */
3365 finish_decl (tree decl, tree init, tree asmspec_tree)
3368 int was_incomplete = (DECL_SIZE (decl) == 0);
3369 const char *asmspec = 0;
3371 /* If a name was specified, get the string. */
3372 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3373 && DECL_FILE_SCOPE_P (decl))
3374 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3376 asmspec = TREE_STRING_POINTER (asmspec_tree);
3378 /* If `start_decl' didn't like having an initialization, ignore it now. */
3379 if (init != 0 && DECL_INITIAL (decl) == 0)
3382 /* Don't crash if parm is initialized. */
3383 if (TREE_CODE (decl) == PARM_DECL)
3387 store_init_value (decl, init);
3389 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3390 || TREE_CODE (decl) == FUNCTION_DECL
3391 || TREE_CODE (decl) == FIELD_DECL))
3392 objc_check_decl (decl);
3394 type = TREE_TYPE (decl);
3396 /* Deduce size of array from initialization, if not already known. */
3397 if (TREE_CODE (type) == ARRAY_TYPE
3398 && TYPE_DOMAIN (type) == 0
3399 && TREE_CODE (decl) != TYPE_DECL)
3402 = (TREE_STATIC (decl)
3403 /* Even if pedantic, an external linkage array
3404 may have incomplete type at first. */
3405 ? pedantic && !TREE_PUBLIC (decl)
3406 : !DECL_EXTERNAL (decl));
3408 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3411 /* Get the completed type made by complete_array_type. */
3412 type = TREE_TYPE (decl);
3417 error ("initializer fails to determine size of %q+D", decl);
3422 error ("array size missing in %q+D", decl);
3423 /* If a `static' var's size isn't known,
3424 make it extern as well as static, so it does not get
3426 If it is not `static', then do not mark extern;
3427 finish_incomplete_decl will give it a default size
3428 and it will get allocated. */
3429 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3430 DECL_EXTERNAL (decl) = 1;
3434 error ("zero or negative size array %q+D", decl);
3438 /* For global variables, update the copy of the type that
3439 exists in the binding. */
3440 if (TREE_PUBLIC (decl))
3442 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3443 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3444 b_ext = b_ext->shadowed;
3448 b_ext->type = composite_type (b_ext->type, type);
3459 if (DECL_INITIAL (decl))
3460 TREE_TYPE (DECL_INITIAL (decl)) = type;
3462 layout_decl (decl, 0);
3465 if (TREE_CODE (decl) == VAR_DECL)
3467 if (init && TREE_CODE (init) == CONSTRUCTOR)
3468 add_flexible_array_elts_to_size (decl, init);
3470 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3471 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3472 layout_decl (decl, 0);
3474 if (DECL_SIZE (decl) == 0
3475 /* Don't give an error if we already gave one earlier. */
3476 && TREE_TYPE (decl) != error_mark_node
3477 && (TREE_STATIC (decl)
3478 /* A static variable with an incomplete type
3479 is an error if it is initialized.
3480 Also if it is not file scope.
3481 Otherwise, let it through, but if it is not `extern'
3482 then it may cause an error message later. */
3483 ? (DECL_INITIAL (decl) != 0
3484 || !DECL_FILE_SCOPE_P (decl))
3485 /* An automatic variable with an incomplete type
3487 : !DECL_EXTERNAL (decl)))
3489 error ("storage size of %q+D isn%'t known", decl);
3490 TREE_TYPE (decl) = error_mark_node;
3493 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3494 && DECL_SIZE (decl) != 0)
3496 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3497 constant_expression_warning (DECL_SIZE (decl));
3499 error ("storage size of %q+D isn%'t constant", decl);
3502 if (TREE_USED (type))
3503 TREE_USED (decl) = 1;
3506 /* If this is a function and an assembler name is specified, reset DECL_RTL
3507 so we can give it its new name. Also, update built_in_decls if it
3508 was a normal built-in. */
3509 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3511 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3512 set_builtin_user_assembler_name (decl, asmspec);
3513 set_user_assembler_name (decl, asmspec);
3516 /* If #pragma weak was used, mark the decl weak now. */
3517 maybe_apply_pragma_weak (decl);
3519 /* Output the assembler code and/or RTL code for variables and functions,
3520 unless the type is an undefined structure or union.
3521 If not, it will get done when the type is completed. */
3523 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3525 /* Determine the ELF visibility. */
3526 if (TREE_PUBLIC (decl))
3527 c_determine_visibility (decl);
3529 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3530 if (c_dialect_objc ())
3531 objc_check_decl (decl);
3535 /* If this is not a static variable, issue a warning.
3536 It doesn't make any sense to give an ASMSPEC for an
3537 ordinary, non-register local variable. Historically,
3538 GCC has accepted -- but ignored -- the ASMSPEC in
3540 if (!DECL_FILE_SCOPE_P (decl)
3541 && TREE_CODE (decl) == VAR_DECL
3542 && !C_DECL_REGISTER (decl)
3543 && !TREE_STATIC (decl))
3544 warning (0, "ignoring asm-specifier for non-static local "
3545 "variable %q+D", decl);
3547 set_user_assembler_name (decl, asmspec);
3550 if (DECL_FILE_SCOPE_P (decl))
3552 if (DECL_INITIAL (decl) == NULL_TREE
3553 || DECL_INITIAL (decl) == error_mark_node)
3554 /* Don't output anything
3555 when a tentative file-scope definition is seen.
3556 But at end of compilation, do output code for them. */
3557 DECL_DEFER_OUTPUT (decl) = 1;
3558 rest_of_decl_compilation (decl, true, 0);
3562 /* In conjunction with an ASMSPEC, the `register'
3563 keyword indicates that we should place the variable
3564 in a particular register. */
3565 if (asmspec && C_DECL_REGISTER (decl))
3567 DECL_HARD_REGISTER (decl) = 1;
3568 /* This cannot be done for a structure with volatile
3569 fields, on which DECL_REGISTER will have been
3571 if (!DECL_REGISTER (decl))
3572 error ("cannot put object with volatile field into register");
3575 if (TREE_CODE (decl) != FUNCTION_DECL)
3577 /* If we're building a variable sized type, and we might be
3578 reachable other than via the top of the current binding
3579 level, then create a new BIND_EXPR so that we deallocate
3580 the object at the right time. */
3581 /* Note that DECL_SIZE can be null due to errors. */
3582 if (DECL_SIZE (decl)
3583 && !TREE_CONSTANT (DECL_SIZE (decl))
3584 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3587 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3588 TREE_SIDE_EFFECTS (bind) = 1;
3590 BIND_EXPR_BODY (bind) = push_stmt_list ();
3592 add_stmt (build_stmt (DECL_EXPR, decl));
3597 if (!DECL_FILE_SCOPE_P (decl))
3599 /* Recompute the RTL of a local array now
3600 if it used to be an incomplete type. */
3602 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3604 /* If we used it already as memory, it must stay in memory. */
3605 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3606 /* If it's still incomplete now, no init will save it. */
3607 if (DECL_SIZE (decl) == 0)
3608 DECL_INITIAL (decl) = 0;
3613 /* If this was marked 'used', be sure it will be output. */
3614 if (!flag_unit_at_a_time && lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3615 mark_decl_referenced (decl);
3617 if (TREE_CODE (decl) == TYPE_DECL)
3619 if (!DECL_FILE_SCOPE_P (decl)
3620 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3621 add_stmt (build_stmt (DECL_EXPR, decl));
3623 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3626 /* At the end of a declaration, throw away any variable type sizes
3627 of types defined inside that declaration. There is no use
3628 computing them in the following function definition. */
3629 if (current_scope == file_scope)
3630 get_pending_sizes ();
3632 /* Install a cleanup (aka destructor) if one was given. */
3633 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3635 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3638 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3639 tree cleanup_decl = lookup_name (cleanup_id);
3642 /* Build "cleanup(&decl)" for the destructor. */
3643 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3644 cleanup = build_tree_list (NULL_TREE, cleanup);
3645 cleanup = build_function_call (cleanup_decl, cleanup);
3647 /* Don't warn about decl unused; the cleanup uses it. */
3648 TREE_USED (decl) = 1;
3649 TREE_USED (cleanup_decl) = 1;
3651 /* Initialize EH, if we've been told to do so. */
3652 c_maybe_initialize_eh ();
3654 push_cleanup (decl, cleanup, false);
3659 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3662 grokparm (const struct c_parm *parm)
3664 tree attrs = parm->attrs;
3665 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3666 NULL, &attrs, DEPRECATED_NORMAL);
3668 decl_attributes (&decl, attrs, 0);
3673 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3674 and push that on the current scope. */
3677 push_parm_decl (const struct c_parm *parm)
3679 tree attrs = parm->attrs;
3682 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
3683 &attrs, DEPRECATED_NORMAL);
3684 decl_attributes (&decl, attrs, 0);
3686 decl = pushdecl (decl);
3688 finish_decl (decl, NULL_TREE, NULL_TREE);
3691 /* Mark all the parameter declarations to date as forward decls.
3692 Also diagnose use of this extension. */
3695 mark_forward_parm_decls (void)
3697 struct c_binding *b;
3699 if (pedantic && !current_scope->warned_forward_parm_decls)
3701 pedwarn ("ISO C forbids forward parameter declarations");
3702 current_scope->warned_forward_parm_decls = true;
3705 for (b = current_scope->bindings; b; b = b->prev)
3706 if (TREE_CODE (b->decl) == PARM_DECL)
3707 TREE_ASM_WRITTEN (b->decl) = 1;
3710 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3711 literal, which may be an incomplete array type completed by the
3712 initializer; INIT is a CONSTRUCTOR that initializes the compound
3716 build_compound_literal (tree type, tree init)
3718 /* We do not use start_decl here because we have a type, not a declarator;
3719 and do not use finish_decl because the decl should be stored inside
3720 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3725 if (type == error_mark_node)
3726 return error_mark_node;
3728 decl = build_decl (VAR_DECL, NULL_TREE, type);
3729 DECL_EXTERNAL (decl) = 0;
3730 TREE_PUBLIC (decl) = 0;
3731 TREE_STATIC (decl) = (current_scope == file_scope);
3732 DECL_CONTEXT (decl) = current_function_decl;
3733 TREE_USED (decl) = 1;
3734 TREE_TYPE (decl) = type;
3735 TREE_READONLY (decl) = TYPE_READONLY (type);
3736 store_init_value (decl, init);
3738 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3740 int failure = complete_array_type (&TREE_TYPE (decl),
3741 DECL_INITIAL (decl), true);
3742 gcc_assert (!failure);
3744 type = TREE_TYPE (decl);
3745 TREE_TYPE (DECL_INITIAL (decl)) = type;
3748 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3749 return error_mark_node;
3751 stmt = build_stmt (DECL_EXPR, decl);
3752 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3753 TREE_SIDE_EFFECTS (complit) = 1;
3755 layout_decl (decl, 0);
3757 if (TREE_STATIC (decl))
3759 /* This decl needs a name for the assembler output. */
3760 set_compound_literal_name (decl);
3761 DECL_DEFER_OUTPUT (decl) = 1;
3762 DECL_COMDAT (decl) = 1;
3763 DECL_ARTIFICIAL (decl) = 1;
3764 DECL_IGNORED_P (decl) = 1;
3766 rest_of_decl_compilation (decl, 1, 0);
3772 /* Determine whether TYPE is a structure with a flexible array member,
3773 or a union containing such a structure (possibly recursively). */
3776 flexible_array_type_p (tree type)
3779 switch (TREE_CODE (type))
3782 x = TYPE_FIELDS (type);
3785 while (TREE_CHAIN (x) != NULL_TREE)
3787 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3788 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3789 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3790 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3794 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3796 if (flexible_array_type_p (TREE_TYPE (x)))
3805 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3806 replacing with appropriate values if they are invalid. */
3808 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3811 unsigned int max_width;
3812 unsigned HOST_WIDE_INT w;
3813 const char *name = orig_name ? orig_name: _("<anonymous>");
3815 /* Detect and ignore out of range field width and process valid
3817 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3818 || TREE_CODE (*width) != INTEGER_CST)
3820 error ("bit-field %qs width not an integer constant", name);
3821 *width = integer_one_node;
3825 constant_expression_warning (*width);
3826 if (tree_int_cst_sgn (*width) < 0)
3828 error ("negative width in bit-field %qs", name);
3829 *width = integer_one_node;
3831 else if (integer_zerop (*width) && orig_name)
3833 error ("zero width for bit-field %qs", name);
3834 *width = integer_one_node;
3838 /* Detect invalid bit-field type. */
3839 if (TREE_CODE (*type) != INTEGER_TYPE
3840 && TREE_CODE (*type) != BOOLEAN_TYPE
3841 && TREE_CODE (*type) != ENUMERAL_TYPE)
3843 error ("bit-field %qs has invalid type", name);
3844 *type = unsigned_type_node;
3847 type_mv = TYPE_MAIN_VARIANT (*type);
3849 && !in_system_header
3850 && type_mv != integer_type_node
3851 && type_mv != unsigned_type_node
3852 && type_mv != boolean_type_node)
3853 pedwarn ("type of bit-field %qs is a GCC extension", name);
3855 max_width = TYPE_PRECISION (*type);
3857 if (0 < compare_tree_int (*width, max_width))
3859 error ("width of %qs exceeds its type", name);
3861 *width = build_int_cst (NULL_TREE, w);
3864 w = tree_low_cst (*width, 1);
3866 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3868 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3870 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3871 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3872 warning (0, "%qs is narrower than values of its type", name);
3878 /* Print warning about variable length array if necessary. */
3881 warn_variable_length_array (const char *name, tree size)
3883 int ped = !flag_isoc99 && pedantic && warn_vla != 0;
3884 int const_size = TREE_CONSTANT (size);
3891 pedwarn ("ISO C90 forbids array %qs whose size "
3892 "can%'t be evaluated",
3895 pedwarn ("ISO C90 forbids array whose size "
3896 "can%'t be evaluated");
3901 pedwarn ("ISO C90 forbids variable length array %qs",
3904 pedwarn ("ISO C90 forbids variable length array");
3907 else if (warn_vla > 0)
3913 "the size of array %qs can"
3914 "%'t be evaluated", name);
3917 "the size of array can %'t be evaluated");
3923 "variable length array %qs is used",
3927 "variable length array is used");
3932 /* Given declspecs and a declarator,
3933 determine the name and type of the object declared
3934 and construct a ..._DECL node for it.
3935 (In one case we can return a ..._TYPE node instead.
3936 For invalid input we sometimes return 0.)
3938 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3940 DECL_CONTEXT says which syntactic context this declaration is in:
3941 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3942 FUNCDEF for a function definition. Like NORMAL but a few different
3943 error messages in each case. Return value may be zero meaning
3944 this definition is too screwy to try to parse.
3945 PARM for a parameter declaration (either within a function prototype
3946 or before a function body). Make a PARM_DECL, or return void_type_node.
3947 TYPENAME if for a typename (in a cast or sizeof).
3948 Don't make a DECL node; just return the ..._TYPE node.
3949 FIELD for a struct or union field; make a FIELD_DECL.
3950 INITIALIZED is true if the decl has an initializer.
3951 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3952 representing the width of the bit-field.
3953 DECL_ATTRS points to the list of attributes that should be added to this
3954 decl. Any nested attributes that belong on the decl itself will be
3956 DEPRECATED_STATE is a deprecated_states value indicating whether
3957 deprecation warnings should be suppressed.
3959 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3960 It may also be so in the PARM case, for a prototype where the
3961 argument type is specified but not the name.
3963 This function is where the complicated C meanings of `static'
3964 and `extern' are interpreted. */
3967 grokdeclarator (const struct c_declarator *declarator,
3968 struct c_declspecs *declspecs,
3969 enum decl_context decl_context, bool initialized, tree *width,
3970 tree *decl_attrs, enum deprecated_states deprecated_state)
3972 tree type = declspecs->type;
3973 bool threadp = declspecs->thread_p;
3974 enum c_storage_class storage_class = declspecs->storage_class;
3978 int type_quals = TYPE_UNQUALIFIED;
3979 const char *name, *orig_name;
3980 tree typedef_type = 0;
3981 bool funcdef_flag = false;
3982 bool funcdef_syntax = false;
3983 int size_varies = 0;
3984 tree decl_attr = declspecs->decl_attr;
3985 int array_ptr_quals = TYPE_UNQUALIFIED;
3986 tree array_ptr_attrs = NULL_TREE;
3987 int array_parm_static = 0;
3988 bool array_parm_vla_unspec_p = false;
3989 tree returned_attrs = NULL_TREE;
3990 bool bitfield = width != NULL;
3992 struct c_arg_info *arg_info = 0;
3994 if (decl_context == FUNCDEF)
3995 funcdef_flag = true, decl_context = NORMAL;
3997 /* Look inside a declarator for the name being declared
3998 and get it as a string, for an error message. */
4000 const struct c_declarator *decl = declarator;
4009 funcdef_syntax = (decl->kind == cdk_function);
4010 decl = decl->declarator;
4014 decl = decl->declarator;
4019 name = IDENTIFIER_POINTER (decl->u.id);
4031 /* A function definition's declarator must have the form of
4032 a function declarator. */
4034 if (funcdef_flag && !funcdef_syntax)
4037 /* If this looks like a function definition, make it one,
4038 even if it occurs where parms are expected.
4039 Then store_parm_decls will reject it and not use it as a parm. */
4040 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4041 decl_context = PARM;
4043 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4044 warn_deprecated_use (declspecs->type);
4046 if ((decl_context == NORMAL || decl_context == FIELD)
4047 && current_scope == file_scope
4048 && variably_modified_type_p (type, NULL_TREE))
4050 error ("variably modified %qs at file scope", name);
4051 type = integer_type_node;
4054 typedef_type = type;
4055 size_varies = C_TYPE_VARIABLE_SIZE (type);
4057 /* Diagnose defaulting to "int". */
4059 if (declspecs->default_int_p && !in_system_header)
4061 /* Issue a warning if this is an ISO C 99 program or if
4062 -Wreturn-type and this is a function, or if -Wimplicit;
4063 prefer the former warning since it is more explicit. */
4064 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4066 warn_about_return_type = 1;
4067 else if (warn_implicit_int || flag_isoc99)
4068 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
4071 /* Adjust the type if a bit-field is being declared,
4072 -funsigned-bitfields applied and the type is not explicitly
4074 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4075 && TREE_CODE (type) == INTEGER_TYPE)
4076 type = c_common_unsigned_type (type);
4078 /* Figure out the type qualifiers for the declaration. There are
4079 two ways a declaration can become qualified. One is something
4080 like `const int i' where the `const' is explicit. Another is
4081 something like `typedef const int CI; CI i' where the type of the
4082 declaration contains the `const'. A third possibility is that
4083 there is a type qualifier on the element type of a typedefed
4084 array type, in which case we should extract that qualifier so
4085 that c_apply_type_quals_to_decls receives the full list of
4086 qualifiers to work with (C90 is not entirely clear about whether
4087 duplicate qualifiers should be diagnosed in this case, but it
4088 seems most appropriate to do so). */
4089 element_type = strip_array_types (type);
4090 constp = declspecs->const_p + TYPE_READONLY (element_type);
4091 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4092 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4093 if (pedantic && !flag_isoc99)
4096 pedwarn ("duplicate %<const%>");
4098 pedwarn ("duplicate %<restrict%>");
4100 pedwarn ("duplicate %<volatile%>");
4102 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4103 type = TYPE_MAIN_VARIANT (type);
4104 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4105 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4106 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4108 /* Warn about storage classes that are invalid for certain
4109 kinds of declarations (parameters, typenames, etc.). */
4113 || storage_class == csc_auto
4114 || storage_class == csc_register
4115 || storage_class == csc_typedef))
4117 if (storage_class == csc_auto
4118 && (pedantic || current_scope == file_scope))
4119 pedwarn ("function definition declared %<auto%>");
4120 if (storage_class == csc_register)
4121 error ("function definition declared %<register%>");
4122 if (storage_class == csc_typedef)
4123 error ("function definition declared %<typedef%>");
4125 error ("function definition declared %<__thread%>");
4127 if (storage_class == csc_auto
4128 || storage_class == csc_register
4129 || storage_class == csc_typedef)
4130 storage_class = csc_none;
4132 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4134 if (decl_context == PARM && storage_class == csc_register)
4138 switch (decl_context)
4141 error ("storage class specified for structure field %qs",
4145 error ("storage class specified for parameter %qs", name);
4148 error ("storage class specified for typename");
4151 storage_class = csc_none;
4155 else if (storage_class == csc_extern
4159 /* 'extern' with initialization is invalid if not at file scope. */
4160 if (current_scope == file_scope)
4162 /* It is fine to have 'extern const' when compiling at C
4163 and C++ intersection. */
4164 if (!(warn_cxx_compat && constp))
4165 warning (0, "%qs initialized and declared %<extern%>", name);
4168 error ("%qs has both %<extern%> and initializer", name);
4170 else if (current_scope == file_scope)
4172 if (storage_class == csc_auto)
4173 error ("file-scope declaration of %qs specifies %<auto%>", name);
4174 if (pedantic && storage_class == csc_register)
4175 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
4179 if (storage_class == csc_extern && funcdef_flag)
4180 error ("nested function %qs declared %<extern%>", name);
4181 else if (threadp && storage_class == csc_none)
4183 error ("function-scope %qs implicitly auto and declared "
4190 /* Now figure out the structure of the declarator proper.
4191 Descend through it, creating more complex types, until we reach
4192 the declared identifier (or NULL_TREE, in an absolute declarator).
4193 At each stage we maintain an unqualified version of the type
4194 together with any qualifiers that should be applied to it with
4195 c_build_qualified_type; this way, array types including
4196 multidimensional array types are first built up in unqualified
4197 form and then the qualified form is created with
4198 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4200 while (declarator && declarator->kind != cdk_id)
4202 if (type == error_mark_node)
4204 declarator = declarator->declarator;
4208 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4209 a cdk_pointer (for *...),
4210 a cdk_function (for ...(...)),
4211 a cdk_attrs (for nested attributes),
4212 or a cdk_id (for the name being declared
4213 or the place in an absolute declarator
4214 where the name was omitted).
4215 For the last case, we have just exited the loop.
4217 At this point, TYPE is the type of elements of an array,
4218 or for a function to return, or for a pointer to point to.
4219 After this sequence of ifs, TYPE is the type of the
4220 array or function or pointer, and DECLARATOR has had its
4221 outermost layer removed. */
4223 if (array_ptr_quals != TYPE_UNQUALIFIED
4224 || array_ptr_attrs != NULL_TREE
4225 || array_parm_static)
4227 /* Only the innermost declarator (making a parameter be of
4228 array type which is converted to pointer type)
4229 may have static or type qualifiers. */
4230 error ("static or type qualifiers in non-parameter array declarator");
4231 array_ptr_quals = TYPE_UNQUALIFIED;
4232 array_ptr_attrs = NULL_TREE;
4233 array_parm_static = 0;
4236 switch (declarator->kind)
4240 /* A declarator with embedded attributes. */
4241 tree attrs = declarator->u.attrs;
4242 const struct c_declarator *inner_decl;
4244 declarator = declarator->declarator;
4245 inner_decl = declarator;
4246 while (inner_decl->kind == cdk_attrs)
4247 inner_decl = inner_decl->declarator;
4248 if (inner_decl->kind == cdk_id)
4249 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4250 else if (inner_decl->kind == cdk_function)
4251 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4252 else if (inner_decl->kind == cdk_array)
4253 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4254 returned_attrs = decl_attributes (&type,
4255 chainon (returned_attrs, attrs),
4261 tree itype = NULL_TREE;
4262 tree size = declarator->u.array.dimen;
4263 /* The index is a signed object `sizetype' bits wide. */
4264 tree index_type = c_common_signed_type (sizetype);
4266 array_ptr_quals = declarator->u.array.quals;
4267 array_ptr_attrs = declarator->u.array.attrs;
4268 array_parm_static = declarator->u.array.static_p;
4269 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
4271 declarator = declarator->declarator;
4273 /* Check for some types that there cannot be arrays of. */
4275 if (VOID_TYPE_P (type))
4277 error ("declaration of %qs as array of voids", name);
4278 type = error_mark_node;
4281 if (TREE_CODE (type) == FUNCTION_TYPE)
4283 error ("declaration of %qs as array of functions", name);
4284 type = error_mark_node;
4287 if (pedantic && !in_system_header && flexible_array_type_p (type))
4288 pedwarn ("invalid use of structure with flexible array member");
4290 if (size == error_mark_node)
4291 type = error_mark_node;
4293 if (type == error_mark_node)
4296 /* If size was specified, set ITYPE to a range-type for
4297 that size. Otherwise, ITYPE remains null. finish_decl
4298 may figure it out from an initial value. */
4302 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4304 STRIP_TYPE_NOPS (size);
4306 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4308 error ("size of array %qs has non-integer type", name);
4309 size = integer_one_node;
4312 if (pedantic && integer_zerop (size))
4313 pedwarn ("ISO C forbids zero-size array %qs", name);
4315 if (TREE_CODE (size) == INTEGER_CST)
4317 constant_expression_warning (size);
4318 if (tree_int_cst_sgn (size) < 0)
4320 error ("size of array %qs is negative", name);
4321 size = integer_one_node;
4324 else if ((decl_context == NORMAL || decl_context == FIELD)
4325 && current_scope == file_scope)
4327 error ("variably modified %qs at file scope", name);
4328 size = integer_one_node;
4332 /* Make sure the array size remains visibly
4333 nonconstant even if it is (eg) a const variable
4334 with known value. */
4336 warn_variable_length_array (orig_name, size);
4339 if (integer_zerop (size))
4341 /* A zero-length array cannot be represented with
4342 an unsigned index type, which is what we'll
4343 get with build_index_type. Create an
4344 open-ended range instead. */
4345 itype = build_range_type (sizetype, size, NULL_TREE);
4349 /* Arrange for the SAVE_EXPR on the inside of the
4350 MINUS_EXPR, which allows the -1 to get folded
4351 with the +1 that happens when building TYPE_SIZE. */
4353 size = variable_size (size);
4355 /* Compute the maximum valid index, that is, size
4356 - 1. Do the calculation in index_type, so that
4357 if it is a variable the computations will be
4358 done in the proper mode. */
4359 itype = fold_build2 (MINUS_EXPR, index_type,
4360 convert (index_type, size),
4361 convert (index_type,
4364 /* If that overflowed, the array is too big. ???
4365 While a size of INT_MAX+1 technically shouldn't
4366 cause an overflow (because we subtract 1), the
4367 overflow is recorded during the conversion to
4368 index_type, before the subtraction. Handling
4369 this case seems like an unnecessary
4371 if (TREE_CODE (itype) == INTEGER_CST
4372 && TREE_OVERFLOW (itype))
4374 error ("size of array %qs is too large", name);
4375 type = error_mark_node;
4379 itype = build_index_type (itype);
4382 else if (decl_context == FIELD)
4384 if (pedantic && !flag_isoc99 && !in_system_header)
4385 pedwarn ("ISO C90 does not support flexible array members");
4387 /* ISO C99 Flexible array members are effectively
4388 identical to GCC's zero-length array extension. */
4389 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4391 else if (decl_context == PARM)
4393 if (array_parm_vla_unspec_p)
4398 error ("%<[*]%> not allowed in other than a declaration");
4401 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4405 else if (decl_context == TYPENAME)
4407 if (array_parm_vla_unspec_p)
4409 /* The error is printed elsewhere. We use this to
4410 avoid messing up with incomplete array types of
4411 the same type, that would otherwise be modified
4413 itype = build_range_type (sizetype, size_zero_node,
4418 /* Complain about arrays of incomplete types. */
4419 if (!COMPLETE_TYPE_P (type))
4421 error ("array type has incomplete element type");
4422 type = error_mark_node;
4425 /* When itype is NULL, a shared incomplete array type is
4426 returned for all array of a given type. Elsewhere we
4427 make sure we don't complete that type before copying
4428 it, but here we want to make sure we don't ever
4429 modify the shared type, so we gcc_assert (itype)
4431 type = build_array_type (type, itype);
4433 if (type != error_mark_node)
4437 /* It is ok to modify type here even if itype is
4438 NULL: if size_varies, we're in a
4439 multi-dimensional array and the inner type has
4440 variable size, so the enclosing shared array type
4442 if (size && TREE_CODE (size) == INTEGER_CST)
4444 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
4445 C_TYPE_VARIABLE_SIZE (type) = 1;
4448 /* The GCC extension for zero-length arrays differs from
4449 ISO flexible array members in that sizeof yields
4451 if (size && integer_zerop (size))
4454 TYPE_SIZE (type) = bitsize_zero_node;
4455 TYPE_SIZE_UNIT (type) = size_zero_node;
4457 if (array_parm_vla_unspec_p)
4460 /* The type is complete. C99 6.7.5.2p4 */
4461 TYPE_SIZE (type) = bitsize_zero_node;
4462 TYPE_SIZE_UNIT (type) = size_zero_node;
4466 if (decl_context != PARM
4467 && (array_ptr_quals != TYPE_UNQUALIFIED
4468 || array_ptr_attrs != NULL_TREE
4469 || array_parm_static))
4471 error ("static or type qualifiers in non-parameter array declarator");
4472 array_ptr_quals = TYPE_UNQUALIFIED;
4473 array_ptr_attrs = NULL_TREE;
4474 array_parm_static = 0;
4480 /* Say it's a definition only for the declarator closest
4481 to the identifier, apart possibly from some
4483 bool really_funcdef = false;
4487 const struct c_declarator *t = declarator->declarator;
4488 while (t->kind == cdk_attrs)
4490 really_funcdef = (t->kind == cdk_id);
4493 /* Declaring a function type. Make sure we have a valid
4494 type for the function to return. */
4495 if (type == error_mark_node)
4500 /* Warn about some types functions can't return. */
4501 if (TREE_CODE (type) == FUNCTION_TYPE)
4503 error ("%qs declared as function returning a function", name);
4504 type = integer_type_node;
4506 if (TREE_CODE (type) == ARRAY_TYPE)
4508 error ("%qs declared as function returning an array", name);
4509 type = integer_type_node;
4512 /* Construct the function type and go to the next
4513 inner layer of declarator. */
4514 arg_info = declarator->u.arg_info;
4515 arg_types = grokparms (arg_info, really_funcdef);
4517 put_pending_sizes (arg_info->pending_sizes);
4519 /* Type qualifiers before the return type of the function
4520 qualify the return type, not the function type. */
4523 /* Type qualifiers on a function return type are
4524 normally permitted by the standard but have no
4525 effect, so give a warning at -Wreturn-type.
4526 Qualifiers on a void return type are banned on
4527 function definitions in ISO C; GCC used to used
4528 them for noreturn functions. */
4529 if (VOID_TYPE_P (type) && really_funcdef)
4530 pedwarn ("function definition has qualified void return type");
4532 warning (OPT_Wignored_qualifiers,
4533 "type qualifiers ignored on function return type");
4535 type = c_build_qualified_type (type, type_quals);
4537 type_quals = TYPE_UNQUALIFIED;
4539 type = build_function_type (type, arg_types);
4540 declarator = declarator->declarator;
4542 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4543 the formal parameter list of this FUNCTION_TYPE to point to
4544 the FUNCTION_TYPE node itself. */
4548 for (link = arg_info->tags;
4550 link = TREE_CHAIN (link))
4551 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4557 /* Merge any constancy or volatility into the target type
4560 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4562 pedwarn ("ISO C forbids qualified function types");
4564 type = c_build_qualified_type (type, type_quals);
4567 /* When the pointed-to type involves components of variable size,
4568 care must be taken to ensure that the size evaluation code is
4569 emitted early enough to dominate all the possible later uses
4570 and late enough for the variables on which it depends to have
4573 This is expected to happen automatically when the pointed-to
4574 type has a name/declaration of it's own, but special attention
4575 is required if the type is anonymous.
4577 We handle the NORMAL and FIELD contexts here by attaching an
4578 artificial TYPE_DECL to such pointed-to type. This forces the
4579 sizes evaluation at a safe point and ensures it is not deferred
4580 until e.g. within a deeper conditional context.
4582 We expect nothing to be needed here for PARM or TYPENAME.
4583 Pushing a TYPE_DECL at this point for TYPENAME would actually
4584 be incorrect, as we might be in the middle of an expression
4585 with side effects on the pointed-to type size "arguments" prior
4586 to the pointer declaration point and the fake TYPE_DECL in the
4587 enclosing context would force the size evaluation prior to the
4590 if (!TYPE_NAME (type)
4591 && (decl_context == NORMAL || decl_context == FIELD)
4592 && variably_modified_type_p (type, NULL_TREE))
4594 tree decl = build_decl (TYPE_DECL, NULL_TREE, type);
4595 DECL_ARTIFICIAL (decl) = 1;
4597 finish_decl (decl, NULL_TREE, NULL_TREE);
4598 TYPE_NAME (type) = decl;
4601 type = build_pointer_type (type);
4603 /* Process type qualifiers (such as const or volatile)
4604 that were given inside the `*'. */
4605 type_quals = declarator->u.pointer_quals;
4607 declarator = declarator->declarator;
4614 *decl_attrs = chainon (returned_attrs, *decl_attrs);
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 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4648 if (declspecs->explicit_signed_p)
4649 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
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);
4672 if (pedantic && decl_context == FIELD
4673 && variably_modified_type_p (type, NULL_TREE))
4676 pedwarn ("a member of a structure or union cannot have a variably modified type");
4679 /* Aside from typedefs and type names (handle above),
4680 `void' at top level (not within pointer)
4681 is allowed only in public variables.
4682 We don't complain about parms either, but that is because
4683 a better error message can be made later. */
4685 if (VOID_TYPE_P (type) && decl_context != PARM
4686 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4687 && (storage_class == csc_extern
4688 || (current_scope == file_scope
4689 && !(storage_class == csc_static
4690 || storage_class == csc_register)))))
4692 error ("variable or field %qs declared void", name);
4693 type = integer_type_node;
4696 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4697 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4702 if (decl_context == PARM)
4704 tree type_as_written;
4707 /* A parameter declared as an array of T is really a pointer to T.
4708 One declared as a function is really a pointer to a function. */
4710 if (TREE_CODE (type) == ARRAY_TYPE)
4712 /* Transfer const-ness of array into that of type pointed to. */
4713 type = TREE_TYPE (type);
4715 type = c_build_qualified_type (type, type_quals);
4716 type = build_pointer_type (type);
4717 type_quals = array_ptr_quals;
4719 type = c_build_qualified_type (type, type_quals);
4721 /* We don't yet implement attributes in this context. */
4722 if (array_ptr_attrs != NULL_TREE)
4723 warning (OPT_Wattributes,
4724 "attributes in parameter array declarator ignored");
4728 else if (TREE_CODE (type) == FUNCTION_TYPE)
4730 if (pedantic && type_quals)
4731 pedwarn ("ISO C forbids qualified function types");
4733 type = c_build_qualified_type (type, type_quals);
4734 type = build_pointer_type (type);
4735 type_quals = TYPE_UNQUALIFIED;
4737 else if (type_quals)
4738 type = c_build_qualified_type (type, type_quals);
4740 type_as_written = type;
4742 decl = build_decl (PARM_DECL, declarator->u.id, type);
4743 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4745 C_DECL_VARIABLE_SIZE (decl) = 1;
4747 /* Compute the type actually passed in the parmlist,
4748 for the case where there is no prototype.
4749 (For example, shorts and chars are passed as ints.)
4750 When there is a prototype, this is overridden later. */
4752 if (type == error_mark_node)
4753 promoted_type = type;
4755 promoted_type = c_type_promotes_to (type);
4757 DECL_ARG_TYPE (decl) = promoted_type;
4758 if (declspecs->inline_p)
4759 pedwarn ("parameter %q+D declared %<inline%>", decl);
4761 else if (decl_context == FIELD)
4763 /* Note that the grammar rejects storage classes in typenames
4765 gcc_assert (storage_class == csc_none && !threadp
4766 && !declspecs->inline_p);
4768 /* Structure field. It may not be a function. */
4770 if (TREE_CODE (type) == FUNCTION_TYPE)
4772 error ("field %qs declared as a function", name);
4773 type = build_pointer_type (type);
4775 else if (TREE_CODE (type) != ERROR_MARK
4776 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4778 error ("field %qs has incomplete type", name);
4779 type = error_mark_node;
4781 type = c_build_qualified_type (type, type_quals);
4782 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4783 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4784 DECL_NONADDRESSABLE_P (decl) = bitfield;
4785 if (bitfield && !declarator->u.id)
4786 TREE_NO_WARNING (decl) = 1;
4789 C_DECL_VARIABLE_SIZE (decl) = 1;
4791 else if (TREE_CODE (type) == FUNCTION_TYPE)
4793 if (storage_class == csc_register || threadp)
4795 error ("invalid storage class for function %qs", name);
4797 else if (current_scope != file_scope)
4799 /* Function declaration not at file scope. Storage
4800 classes other than `extern' are not allowed, C99
4801 6.7.1p5, and `extern' makes no difference. However,
4802 GCC allows 'auto', perhaps with 'inline', to support
4803 nested functions. */
4804 if (storage_class == csc_auto)
4807 pedwarn ("invalid storage class for function %qs", name);
4809 else if (storage_class == csc_static)
4811 error ("invalid storage class for function %qs", name);
4813 storage_class = declspecs->storage_class = csc_none;
4819 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4820 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4821 decl = build_decl_attribute_variant (decl, decl_attr);
4823 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4824 pedwarn ("ISO C forbids qualified function types");
4826 /* GNU C interprets a volatile-qualified function type to indicate
4827 that the function does not return. */
4828 if ((type_quals & TYPE_QUAL_VOLATILE)
4829 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4830 warning (0, "%<noreturn%> function returns non-void value");
4832 /* Every function declaration is an external reference
4833 (DECL_EXTERNAL) except for those which are not at file
4834 scope and are explicitly declared "auto". This is
4835 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4836 GCC to signify a forward declaration of a nested function. */
4837 if (storage_class == csc_auto && current_scope != file_scope)
4838 DECL_EXTERNAL (decl) = 0;
4839 /* In C99, a function which is declared 'inline' with 'extern'
4840 is not an external reference (which is confusing). It
4841 means that the later definition of the function must be output
4842 in this file, C99 6.7.4p6. In GNU C89, a function declared
4843 'extern inline' is an external reference. */
4844 else if (declspecs->inline_p && storage_class != csc_static)
4845 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
4846 == flag_gnu89_inline);
4848 DECL_EXTERNAL (decl) = !initialized;
4850 /* Record absence of global scope for `static' or `auto'. */
4852 = !(storage_class == csc_static || storage_class == csc_auto);
4854 /* For a function definition, record the argument information
4855 block where store_parm_decls will look for it. */
4857 current_function_arg_info = arg_info;
4859 if (declspecs->default_int_p)
4860 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4862 /* Record presence of `inline', if it is reasonable. */
4863 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4865 if (declspecs->inline_p)
4866 pedwarn ("cannot inline function %<main%>");
4868 else if (declspecs->inline_p)
4870 /* Record that the function is declared `inline'. */
4871 DECL_DECLARED_INLINE_P (decl) = 1;
4873 /* Do not mark bare declarations as DECL_INLINE. Doing so
4874 in the presence of multiple declarations can result in
4875 the abstract origin pointing between the declarations,
4876 which will confuse dwarf2out. */
4878 DECL_INLINE (decl) = 1;
4880 /* If -finline-functions, assume it can be inlined. This does
4881 two things: let the function be deferred until it is actually
4882 needed, and let dwarf2 know that the function is inlinable. */
4883 else if (flag_inline_trees == 2 && initialized)
4884 DECL_INLINE (decl) = 1;
4888 /* It's a variable. */
4889 /* An uninitialized decl with `extern' is a reference. */
4890 int extern_ref = !initialized && storage_class == csc_extern;
4892 type = c_build_qualified_type (type, type_quals);
4894 /* C99 6.2.2p7: It is invalid (compile-time undefined
4895 behavior) to create an 'extern' declaration for a
4896 variable if there is a global declaration that is
4897 'static' and the global declaration is not visible.
4898 (If the static declaration _is_ currently visible,
4899 the 'extern' declaration is taken to refer to that decl.) */
4900 if (extern_ref && current_scope != file_scope)
4902 tree global_decl = identifier_global_value (declarator->u.id);
4903 tree visible_decl = lookup_name (declarator->u.id);
4906 && global_decl != visible_decl
4907 && TREE_CODE (global_decl) == VAR_DECL
4908 && !TREE_PUBLIC (global_decl))
4909 error ("variable previously declared %<static%> redeclared "
4913 decl = build_decl (VAR_DECL, declarator->u.id, type);
4914 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4916 C_DECL_VARIABLE_SIZE (decl) = 1;
4918 if (declspecs->inline_p)
4919 pedwarn ("variable %q+D declared %<inline%>", decl);
4921 /* At file scope, an initialized extern declaration may follow
4922 a static declaration. In that case, DECL_EXTERNAL will be
4923 reset later in start_decl. */
4924 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4926 /* At file scope, the presence of a `static' or `register' storage
4927 class specifier, or the absence of all storage class specifiers
4928 makes this declaration a definition (perhaps tentative). Also,
4929 the absence of `static' makes it public. */
4930 if (current_scope == file_scope)
4932 TREE_PUBLIC (decl) = storage_class != csc_static;
4933 TREE_STATIC (decl) = !extern_ref;
4935 /* Not at file scope, only `static' makes a static definition. */
4938 TREE_STATIC (decl) = (storage_class == csc_static);
4939 TREE_PUBLIC (decl) = extern_ref;
4943 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4946 if (storage_class == csc_extern
4947 && variably_modified_type_p (type, NULL_TREE))
4950 error ("object with variably modified type must have no linkage");
4953 /* Record `register' declaration for warnings on &
4954 and in case doing stupid register allocation. */
4956 if (storage_class == csc_register)
4958 C_DECL_REGISTER (decl) = 1;
4959 DECL_REGISTER (decl) = 1;
4962 /* Record constancy and volatility. */
4963 c_apply_type_quals_to_decl (type_quals, decl);
4965 /* If a type has volatile components, it should be stored in memory.
4966 Otherwise, the fact that those components are volatile
4967 will be ignored, and would even crash the compiler.
4968 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4969 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4970 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4971 || TREE_CODE (decl) == RESULT_DECL))
4973 /* It is not an error for a structure with volatile fields to
4974 be declared register, but reset DECL_REGISTER since it
4975 cannot actually go in a register. */
4976 int was_reg = C_DECL_REGISTER (decl);
4977 C_DECL_REGISTER (decl) = 0;
4978 DECL_REGISTER (decl) = 0;
4979 c_mark_addressable (decl);
4980 C_DECL_REGISTER (decl) = was_reg;
4983 /* This is the earliest point at which we might know the assembler
4984 name of a variable. Thus, if it's known before this, die horribly. */
4985 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
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.
5388 DECL_ATTRS is as for grokdeclarator.
5390 This is done during the parsing of the struct declaration.
5391 The FIELD_DECL nodes are chained together and the lot of them
5392 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5395 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5396 tree width, tree *decl_attrs)
5400 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5401 && width == NULL_TREE)
5403 /* This is an unnamed decl.
5405 If we have something of the form "union { list } ;" then this
5406 is the anonymous union extension. Similarly for struct.
5408 If this is something of the form "struct foo;", then
5409 If MS extensions are enabled, this is handled as an
5411 Otherwise this is a forward declaration of a structure tag.
5413 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5414 If MS extensions are enabled and foo names a structure, then
5415 again this is an anonymous struct.
5416 Otherwise this is an error.
5418 Oh what a horrid tangled web we weave. I wonder if MS consciously
5419 took this from Plan 9 or if it was an accident of implementation
5420 that took root before someone noticed the bug... */
5422 tree type = declspecs->type;
5423 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5424 || TREE_CODE (type) == UNION_TYPE);
5428 && (flag_ms_extensions || !declspecs->typedef_p))
5430 if (flag_ms_extensions)
5434 else if (TYPE_NAME (type) == NULL)
5441 pedwarn ("declaration does not declare anything");
5445 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5448 value = grokdeclarator (declarator, declspecs, FIELD, false,
5449 width ? &width : NULL, decl_attrs,
5452 finish_decl (value, NULL_TREE, NULL_TREE);
5453 DECL_INITIAL (value) = width;
5458 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5459 the list such that this does not present a problem later. */
5462 detect_field_duplicates (tree fieldlist)
5467 /* First, see if there are more than "a few" fields.
5468 This is trivially true if there are zero or one fields. */
5471 x = TREE_CHAIN (fieldlist);
5477 } while (timeout > 0 && x);
5479 /* If there were "few" fields, avoid the overhead of allocating
5480 a hash table. Instead just do the nested traversal thing. */
5483 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5486 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5487 if (DECL_NAME (y) == DECL_NAME (x))
5489 error ("duplicate member %q+D", x);
5490 DECL_NAME (x) = NULL_TREE;
5496 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5499 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5500 if ((y = DECL_NAME (x)) != 0)
5502 slot = htab_find_slot (htab, y, INSERT);
5505 error ("duplicate member %q+D", x);
5506 DECL_NAME (x) = NULL_TREE;
5515 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5516 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5517 ATTRIBUTES are attributes to be applied to the structure. */
5520 finish_struct (tree t, tree fieldlist, tree attributes)
5523 bool toplevel = file_scope == current_scope;
5524 int saw_named_field;
5526 /* If this type was previously laid out as a forward reference,
5527 make sure we lay it out again. */
5531 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5535 for (x = fieldlist; x; x = TREE_CHAIN (x))
5536 if (DECL_NAME (x) != 0)
5541 if (TREE_CODE (t) == UNION_TYPE)
5544 pedwarn ("union has no named members");
5546 pedwarn ("union has no members");
5551 pedwarn ("struct has no named members");
5553 pedwarn ("struct has no members");
5558 /* Install struct as DECL_CONTEXT of each field decl.
5559 Also process specified field sizes, found in the DECL_INITIAL,
5560 storing 0 there after the type has been changed to precision equal
5561 to its width, rather than the precision of the specified standard
5562 type. (Correct layout requires the original type to have been preserved
5565 saw_named_field = 0;
5566 for (x = fieldlist; x; x = TREE_CHAIN (x))
5568 if (TREE_TYPE (x) == error_mark_node)
5571 DECL_CONTEXT (x) = t;
5573 if (TYPE_PACKED (t) && TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)
5574 DECL_PACKED (x) = 1;
5576 /* If any field is const, the structure type is pseudo-const. */
5577 if (TREE_READONLY (x))
5578 C_TYPE_FIELDS_READONLY (t) = 1;
5581 /* A field that is pseudo-const makes the structure likewise. */
5582 tree t1 = TREE_TYPE (x);
5583 while (TREE_CODE (t1) == ARRAY_TYPE)
5584 t1 = TREE_TYPE (t1);
5585 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5586 && C_TYPE_FIELDS_READONLY (t1))
5587 C_TYPE_FIELDS_READONLY (t) = 1;
5590 /* Any field that is volatile means variables of this type must be
5591 treated in some ways as volatile. */
5592 if (TREE_THIS_VOLATILE (x))
5593 C_TYPE_FIELDS_VOLATILE (t) = 1;
5595 /* Any field of nominal variable size implies structure is too. */
5596 if (C_DECL_VARIABLE_SIZE (x))
5597 C_TYPE_VARIABLE_SIZE (t) = 1;
5599 if (DECL_INITIAL (x))
5601 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5602 DECL_SIZE (x) = bitsize_int (width);
5603 DECL_BIT_FIELD (x) = 1;
5604 SET_DECL_C_BIT_FIELD (x);
5607 /* Detect flexible array member in an invalid context. */
5608 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5609 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5610 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5611 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5613 if (TREE_CODE (t) == UNION_TYPE)
5615 error ("%Jflexible array member in union", x);
5616 TREE_TYPE (x) = error_mark_node;
5618 else if (TREE_CHAIN (x) != NULL_TREE)
5620 error ("%Jflexible array member not at end of struct", x);
5621 TREE_TYPE (x) = error_mark_node;
5623 else if (!saw_named_field)
5625 error ("%Jflexible array member in otherwise empty struct", x);
5626 TREE_TYPE (x) = error_mark_node;
5630 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5631 && flexible_array_type_p (TREE_TYPE (x)))
5632 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5635 saw_named_field = 1;
5638 detect_field_duplicates (fieldlist);
5640 /* Now we have the nearly final fieldlist. Record it,
5641 then lay out the structure or union (including the fields). */
5643 TYPE_FIELDS (t) = fieldlist;
5647 /* Give bit-fields their proper types. */
5649 tree *fieldlistp = &fieldlist;
5651 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5652 && TREE_TYPE (*fieldlistp) != error_mark_node)
5654 unsigned HOST_WIDE_INT width
5655 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5656 tree type = TREE_TYPE (*fieldlistp);
5657 if (width != TYPE_PRECISION (type))
5659 TREE_TYPE (*fieldlistp)
5660 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5661 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5663 DECL_INITIAL (*fieldlistp) = 0;
5666 fieldlistp = &TREE_CHAIN (*fieldlistp);
5669 /* Now we have the truly final field list.
5670 Store it in this type and in the variants. */
5672 TYPE_FIELDS (t) = fieldlist;
5674 /* If there are lots of fields, sort so we can look through them fast.
5675 We arbitrarily consider 16 or more elts to be "a lot". */
5680 for (x = fieldlist; x; x = TREE_CHAIN (x))
5682 if (len > 15 || DECL_NAME (x) == NULL)
5690 struct lang_type *space;
5691 struct sorted_fields_type *space2;
5693 len += list_length (x);
5695 /* Use the same allocation policy here that make_node uses, to
5696 ensure that this lives as long as the rest of the struct decl.
5697 All decls in an inline function need to be saved. */
5699 space = GGC_CNEW (struct lang_type);
5700 space2 = GGC_NEWVAR (struct sorted_fields_type,
5701 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5705 field_array = &space2->elts[0];
5706 for (x = fieldlist; x; x = TREE_CHAIN (x))
5708 field_array[len++] = x;
5710 /* If there is anonymous struct or union, break out of the loop. */
5711 if (DECL_NAME (x) == NULL)
5714 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5717 TYPE_LANG_SPECIFIC (t) = space;
5718 TYPE_LANG_SPECIFIC (t)->s->len = len;
5719 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5720 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5725 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5727 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5728 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5729 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5730 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5731 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5734 /* If this was supposed to be a transparent union, but we can't
5735 make it one, warn and turn off the flag. */
5736 if (TREE_CODE (t) == UNION_TYPE
5737 && TYPE_TRANSPARENT_UNION (t)
5738 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5740 TYPE_TRANSPARENT_UNION (t) = 0;
5741 warning (0, "union cannot be made transparent");
5744 /* If this structure or union completes the type of any previous
5745 variable declaration, lay it out and output its rtl. */
5746 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5750 tree decl = TREE_VALUE (x);
5751 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5752 layout_array_type (TREE_TYPE (decl));
5753 if (TREE_CODE (decl) != TYPE_DECL)
5755 layout_decl (decl, 0);
5756 if (c_dialect_objc ())
5757 objc_check_decl (decl);
5758 rest_of_decl_compilation (decl, toplevel, 0);
5763 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5765 /* Finish debugging output for this type. */
5766 rest_of_type_compilation (t, toplevel);
5768 /* If we're inside a function proper, i.e. not file-scope and not still
5769 parsing parameters, then arrange for the size of a variable sized type
5771 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
5772 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5777 /* Lay out the type T, and its element type, and so on. */
5780 layout_array_type (tree t)
5782 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5783 layout_array_type (TREE_TYPE (t));
5787 /* Begin compiling the definition of an enumeration type.
5788 NAME is its name (or null if anonymous).
5789 Returns the type object, as yet incomplete.
5790 Also records info about it so that build_enumerator
5791 may be used to declare the individual values as they are read. */
5794 start_enum (struct c_enum_contents *the_enum, tree name)
5798 /* If this is the real definition for a previous forward reference,
5799 fill in the contents in the same object that used to be the
5800 forward reference. */
5803 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5805 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5807 enumtype = make_node (ENUMERAL_TYPE);
5808 pushtag (name, enumtype);
5811 if (C_TYPE_BEING_DEFINED (enumtype))
5812 error ("nested redefinition of %<enum %E%>", name);
5814 C_TYPE_BEING_DEFINED (enumtype) = 1;
5816 if (TYPE_VALUES (enumtype) != 0)
5818 /* This enum is a named one that has been declared already. */
5819 error ("redeclaration of %<enum %E%>", name);
5821 /* Completely replace its old definition.
5822 The old enumerators remain defined, however. */
5823 TYPE_VALUES (enumtype) = 0;
5826 the_enum->enum_next_value = integer_zero_node;
5827 the_enum->enum_overflow = 0;
5829 if (flag_short_enums)
5830 TYPE_PACKED (enumtype) = 1;
5835 /* After processing and defining all the values of an enumeration type,
5836 install their decls in the enumeration type and finish it off.
5837 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5838 and ATTRIBUTES are the specified attributes.
5839 Returns ENUMTYPE. */
5842 finish_enum (tree enumtype, tree values, tree attributes)
5845 tree minnode = 0, maxnode = 0;
5846 int precision, unsign;
5847 bool toplevel = (file_scope == current_scope);
5848 struct lang_type *lt;
5850 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5852 /* Calculate the maximum value of any enumerator in this type. */
5854 if (values == error_mark_node)
5855 minnode = maxnode = integer_zero_node;
5858 minnode = maxnode = TREE_VALUE (values);
5859 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5861 tree value = TREE_VALUE (pair);
5862 if (tree_int_cst_lt (maxnode, value))
5864 if (tree_int_cst_lt (value, minnode))
5869 /* Construct the final type of this enumeration. It is the same
5870 as one of the integral types - the narrowest one that fits, except
5871 that normally we only go as narrow as int - and signed iff any of
5872 the values are negative. */
5873 unsign = (tree_int_cst_sgn (minnode) >= 0);
5874 precision = MAX (min_precision (minnode, unsign),
5875 min_precision (maxnode, unsign));
5877 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5879 tem = c_common_type_for_size (precision, unsign);
5882 warning (0, "enumeration values exceed range of largest integer");
5883 tem = long_long_integer_type_node;
5887 tem = unsign ? unsigned_type_node : integer_type_node;
5889 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5890 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5891 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5892 TYPE_SIZE (enumtype) = 0;
5894 /* If the precision of the type was specific with an attribute and it
5895 was too small, give an error. Otherwise, use it. */
5896 if (TYPE_PRECISION (enumtype))
5898 if (precision > TYPE_PRECISION (enumtype))
5899 error ("specified mode too small for enumeral values");
5902 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5904 layout_type (enumtype);
5906 if (values != error_mark_node)
5908 /* Change the type of the enumerators to be the enum type. We
5909 need to do this irrespective of the size of the enum, for
5910 proper type checking. Replace the DECL_INITIALs of the
5911 enumerators, and the value slots of the list, with copies
5912 that have the enum type; they cannot be modified in place
5913 because they may be shared (e.g. integer_zero_node) Finally,
5914 change the purpose slots to point to the names of the decls. */
5915 for (pair = values; pair; pair = TREE_CHAIN (pair))
5917 tree enu = TREE_PURPOSE (pair);
5918 tree ini = DECL_INITIAL (enu);
5920 TREE_TYPE (enu) = enumtype;
5922 /* The ISO C Standard mandates enumerators to have type int,
5923 even though the underlying type of an enum type is
5924 unspecified. Here we convert any enumerators that fit in
5925 an int to type int, to avoid promotions to unsigned types
5926 when comparing integers with enumerators that fit in the
5927 int range. When -pedantic is given, build_enumerator()
5928 would have already taken care of those that don't fit. */
5929 if (int_fits_type_p (ini, integer_type_node))
5930 tem = integer_type_node;
5933 ini = convert (tem, ini);
5935 DECL_INITIAL (enu) = ini;
5936 TREE_PURPOSE (pair) = DECL_NAME (enu);
5937 TREE_VALUE (pair) = ini;
5940 TYPE_VALUES (enumtype) = values;
5943 /* Record the min/max values so that we can warn about bit-field
5944 enumerations that are too small for the values. */
5945 lt = GGC_CNEW (struct lang_type);
5946 lt->enum_min = minnode;
5947 lt->enum_max = maxnode;
5948 TYPE_LANG_SPECIFIC (enumtype) = lt;
5950 /* Fix up all variant types of this enum type. */
5951 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5953 if (tem == enumtype)
5955 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5956 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5957 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5958 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5959 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5960 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5961 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5962 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5963 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5964 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5965 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5968 /* Finish debugging output for this type. */
5969 rest_of_type_compilation (enumtype, toplevel);
5974 /* Build and install a CONST_DECL for one value of the
5975 current enumeration type (one that was begun with start_enum).
5976 Return a tree-list containing the CONST_DECL and its value.
5977 Assignment of sequential values by default is handled here. */
5980 build_enumerator (struct c_enum_contents *the_enum, tree name, tree value)
5984 /* Validate and default VALUE. */
5988 /* Don't issue more errors for error_mark_node (i.e. an
5989 undeclared identifier) - just ignore the value expression. */
5990 if (value == error_mark_node)
5992 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5993 || TREE_CODE (value) != INTEGER_CST)
5995 error ("enumerator value for %qE is not an integer constant", name);
6000 value = default_conversion (value);
6001 constant_expression_warning (value);
6005 /* Default based on previous value. */
6006 /* It should no longer be possible to have NON_LVALUE_EXPR
6010 value = the_enum->enum_next_value;
6011 if (the_enum->enum_overflow)
6012 error ("overflow in enumeration values");
6015 if (pedantic && !int_fits_type_p (value, integer_type_node))
6017 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
6018 /* XXX This causes -pedantic to change the meaning of the program.
6019 Remove? -zw 2004-03-15 */
6020 value = convert (integer_type_node, value);
6023 /* Set basis for default for next value. */
6024 the_enum->enum_next_value = build_binary_op (PLUS_EXPR, value,
6025 integer_one_node, 0);
6026 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
6028 /* Now create a declaration for the enum value name. */
6030 type = TREE_TYPE (value);
6031 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
6032 TYPE_PRECISION (integer_type_node)),
6033 (TYPE_PRECISION (type)
6034 >= TYPE_PRECISION (integer_type_node)
6035 && TYPE_UNSIGNED (type)));
6037 decl = build_decl (CONST_DECL, name, type);
6038 DECL_INITIAL (decl) = convert (type, value);
6041 return tree_cons (decl, value, NULL_TREE);
6045 /* Create the FUNCTION_DECL for a function definition.
6046 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6047 the declaration; they describe the function's name and the type it returns,
6048 but twisted together in a fashion that parallels the syntax of C.
6050 This function creates a binding context for the function body
6051 as well as setting up the FUNCTION_DECL in current_function_decl.
6053 Returns 1 on success. If the DECLARATOR is not suitable for a function
6054 (it defines a datum instead), we return 0, which tells
6055 yyparse to report a parse error. */
6058 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
6061 tree decl1, old_decl;
6062 tree restype, resdecl;
6063 struct c_label_context_se *nstack_se;
6064 struct c_label_context_vm *nstack_vm;
6066 current_function_returns_value = 0; /* Assume, until we see it does. */
6067 current_function_returns_null = 0;
6068 current_function_returns_abnormally = 0;
6069 warn_about_return_type = 0;
6070 c_switch_stack = NULL;
6072 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
6073 nstack_se->labels_def = NULL;
6074 nstack_se->labels_used = NULL;
6075 nstack_se->next = label_context_stack_se;
6076 label_context_stack_se = nstack_se;
6078 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
6079 nstack_vm->labels_def = NULL;
6080 nstack_vm->labels_used = NULL;
6081 nstack_vm->scope = 0;
6082 nstack_vm->next = label_context_stack_vm;
6083 label_context_stack_vm = nstack_vm;
6085 /* Indicate no valid break/continue context by setting these variables
6086 to some non-null, non-label value. We'll notice and emit the proper
6087 error message in c_finish_bc_stmt. */
6088 c_break_label = c_cont_label = size_zero_node;
6090 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
6091 &attributes, DEPRECATED_NORMAL);
6093 /* If the declarator is not suitable for a function definition,
6094 cause a syntax error. */
6097 label_context_stack_se = label_context_stack_se->next;
6098 label_context_stack_vm = label_context_stack_vm->next;
6102 decl_attributes (&decl1, attributes, 0);
6104 if (DECL_DECLARED_INLINE_P (decl1)
6105 && DECL_UNINLINABLE (decl1)
6106 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6107 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
6110 /* Handle gnu_inline attribute. */
6111 if (declspecs->inline_p
6112 && !flag_gnu89_inline
6113 && TREE_CODE (decl1) == FUNCTION_DECL
6114 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1)))
6116 if (declspecs->storage_class != csc_static)
6117 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
6120 announce_function (decl1);
6122 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6124 error ("return type is an incomplete type");
6125 /* Make it return void instead. */
6127 = build_function_type (void_type_node,
6128 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6131 if (warn_about_return_type)
6132 pedwarn_c99 ("return type defaults to %<int%>");
6134 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6135 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6136 DECL_INITIAL (decl1) = error_mark_node;
6138 /* If this definition isn't a prototype and we had a prototype declaration
6139 before, copy the arg type info from that prototype. */
6140 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
6141 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
6143 current_function_prototype_locus = UNKNOWN_LOCATION;
6144 current_function_prototype_built_in = false;
6145 current_function_prototype_arg_types = NULL_TREE;
6146 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6148 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6149 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6150 TREE_TYPE (TREE_TYPE (old_decl))))
6152 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
6154 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
6155 current_function_prototype_built_in
6156 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
6157 current_function_prototype_arg_types
6158 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
6160 if (TREE_PUBLIC (decl1))
6162 /* If there is an external prototype declaration of this
6163 function, record its location but do not copy information
6164 to this decl. This may be an invisible declaration
6165 (built-in or in a scope which has finished) or simply
6166 have more refined argument types than any declaration
6168 struct c_binding *b;
6169 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
6170 if (B_IN_SCOPE (b, external_scope))
6174 tree ext_decl, ext_type;
6176 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
6177 if (TREE_CODE (ext_type) == FUNCTION_TYPE
6178 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6179 TREE_TYPE (ext_type)))
6181 current_function_prototype_locus
6182 = DECL_SOURCE_LOCATION (ext_decl);
6183 current_function_prototype_built_in
6184 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
6185 current_function_prototype_arg_types
6186 = TYPE_ARG_TYPES (ext_type);
6192 /* Optionally warn of old-fashioned def with no previous prototype. */
6193 if (warn_strict_prototypes
6194 && old_decl != error_mark_node
6195 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6196 && C_DECL_ISNT_PROTOTYPE (old_decl))
6197 warning (OPT_Wstrict_prototypes,
6198 "function declaration isn%'t a prototype");
6199 /* Optionally warn of any global def with no previous prototype. */
6200 else if (warn_missing_prototypes
6201 && old_decl != error_mark_node
6202 && TREE_PUBLIC (decl1)
6203 && !MAIN_NAME_P (DECL_NAME (decl1))
6204 && C_DECL_ISNT_PROTOTYPE (old_decl))
6205 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
6206 /* Optionally warn of any def with no previous prototype
6207 if the function has already been used. */
6208 else if (warn_missing_prototypes
6210 && old_decl != error_mark_node
6211 && TREE_USED (old_decl)
6212 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6213 warning (OPT_Wmissing_prototypes,
6214 "%q+D was used with no prototype before its definition", decl1);
6215 /* Optionally warn of any global def with no previous declaration. */
6216 else if (warn_missing_declarations
6217 && TREE_PUBLIC (decl1)
6219 && !MAIN_NAME_P (DECL_NAME (decl1)))
6220 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
6222 /* Optionally warn of any def with no previous declaration
6223 if the function has already been used. */
6224 else if (warn_missing_declarations
6226 && old_decl != error_mark_node
6227 && TREE_USED (old_decl)
6228 && C_DECL_IMPLICIT (old_decl))
6229 warning (OPT_Wmissing_declarations,
6230 "%q+D was used with no declaration before its definition", decl1);
6232 /* This function exists in static storage.
6233 (This does not mean `static' in the C sense!) */
6234 TREE_STATIC (decl1) = 1;
6236 /* A nested function is not global. */
6237 if (current_function_decl != 0)
6238 TREE_PUBLIC (decl1) = 0;
6240 /* This is the earliest point at which we might know the assembler
6241 name of the function. Thus, if it's set before this, die horribly. */
6242 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
6244 /* If #pragma weak was used, mark the decl weak now. */
6245 if (current_scope == file_scope)
6246 maybe_apply_pragma_weak (decl1);
6248 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6249 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6251 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6252 != integer_type_node)
6253 pedwarn ("return type of %q+D is not %<int%>", decl1);
6255 check_main_parameter_types(decl1);
6257 if (!TREE_PUBLIC (decl1))
6258 pedwarn ("%q+D is normally a non-static function", decl1);
6261 /* Record the decl so that the function name is defined.
6262 If we already have a decl for this name, and it is a FUNCTION_DECL,
6263 use the old decl. */
6265 current_function_decl = pushdecl (decl1);
6268 declare_parm_level ();
6270 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6271 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6272 DECL_ARTIFICIAL (resdecl) = 1;
6273 DECL_IGNORED_P (resdecl) = 1;
6274 DECL_RESULT (current_function_decl) = resdecl;
6276 start_fname_decls ();
6281 /* Subroutine of store_parm_decls which handles new-style function
6282 definitions (prototype format). The parms already have decls, so we
6283 need only record them as in effect and complain if any redundant
6284 old-style parm decls were written. */
6286 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6290 if (current_scope->bindings)
6292 error ("%Jold-style parameter declarations in prototyped "
6293 "function definition", fndecl);
6295 /* Get rid of the old-style declarations. */
6299 /* Don't issue this warning for nested functions, and don't issue this
6300 warning if we got here because ARG_INFO_TYPES was error_mark_node
6301 (this happens when a function definition has just an ellipsis in
6302 its parameter list). */
6303 else if (!in_system_header && !current_function_scope
6304 && arg_info->types != error_mark_node)
6305 warning (OPT_Wtraditional,
6306 "%Jtraditional C rejects ISO C style function definitions",
6309 /* Now make all the parameter declarations visible in the function body.
6310 We can bypass most of the grunt work of pushdecl. */
6311 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6313 DECL_CONTEXT (decl) = current_function_decl;
6314 if (DECL_NAME (decl))
6316 bind (DECL_NAME (decl), decl, current_scope,
6317 /*invisible=*/false, /*nested=*/false);
6318 if (!TREE_USED (decl))
6319 warn_if_shadowing (decl);
6322 error ("%Jparameter name omitted", decl);
6325 /* Record the parameter list in the function declaration. */
6326 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6328 /* Now make all the ancillary declarations visible, likewise. */
6329 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6331 DECL_CONTEXT (decl) = current_function_decl;
6332 if (DECL_NAME (decl))
6333 bind (DECL_NAME (decl), decl, current_scope,
6334 /*invisible=*/false, /*nested=*/false);
6337 /* And all the tag declarations. */
6338 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6339 if (TREE_PURPOSE (decl))
6340 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6341 /*invisible=*/false, /*nested=*/false);
6344 /* Subroutine of store_parm_decls which handles old-style function
6345 definitions (separate parameter list and declarations). */
6348 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6350 struct c_binding *b;
6351 tree parm, decl, last;
6352 tree parmids = arg_info->parms;
6353 struct pointer_set_t *seen_args = pointer_set_create ();
6355 if (!in_system_header)
6356 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6359 /* Match each formal parameter name with its declaration. Save each
6360 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6361 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6363 if (TREE_VALUE (parm) == 0)
6365 error ("%Jparameter name missing from parameter list", fndecl);
6366 TREE_PURPOSE (parm) = 0;
6370 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6371 if (b && B_IN_CURRENT_SCOPE (b))
6374 /* If we got something other than a PARM_DECL it is an error. */
6375 if (TREE_CODE (decl) != PARM_DECL)
6376 error ("%q+D declared as a non-parameter", decl);
6377 /* If the declaration is already marked, we have a duplicate
6378 name. Complain and ignore the duplicate. */
6379 else if (pointer_set_contains (seen_args, decl))
6381 error ("multiple parameters named %q+D", decl);
6382 TREE_PURPOSE (parm) = 0;
6385 /* If the declaration says "void", complain and turn it into
6387 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6389 error ("parameter %q+D declared with void type", decl);
6390 TREE_TYPE (decl) = integer_type_node;
6391 DECL_ARG_TYPE (decl) = integer_type_node;
6392 layout_decl (decl, 0);
6394 warn_if_shadowing (decl);
6396 /* If no declaration found, default to int. */
6399 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6400 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6401 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6403 warn_if_shadowing (decl);
6406 pedwarn ("type of %q+D defaults to %<int%>", decl);
6408 warning (OPT_Wmissing_parameter_type, "type of %q+D defaults to %<int%>", decl);
6411 TREE_PURPOSE (parm) = decl;
6412 pointer_set_insert (seen_args, decl);
6415 /* Now examine the parms chain for incomplete declarations
6416 and declarations with no corresponding names. */
6418 for (b = current_scope->bindings; b; b = b->prev)
6421 if (TREE_CODE (parm) != PARM_DECL)
6424 if (TREE_TYPE (parm) != error_mark_node
6425 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6427 error ("parameter %q+D has incomplete type", parm);
6428 TREE_TYPE (parm) = error_mark_node;
6431 if (!pointer_set_contains (seen_args, parm))
6433 error ("declaration for parameter %q+D but no such parameter", parm);
6435 /* Pretend the parameter was not missing.
6436 This gets us to a standard state and minimizes
6437 further error messages. */
6438 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6442 /* Chain the declarations together in the order of the list of
6443 names. Store that chain in the function decl, replacing the
6444 list of names. Update the current scope to match. */
6445 DECL_ARGUMENTS (fndecl) = 0;
6447 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6448 if (TREE_PURPOSE (parm))
6450 if (parm && TREE_PURPOSE (parm))
6452 last = TREE_PURPOSE (parm);
6453 DECL_ARGUMENTS (fndecl) = last;
6455 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6456 if (TREE_PURPOSE (parm))
6458 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6459 last = TREE_PURPOSE (parm);
6461 TREE_CHAIN (last) = 0;
6464 pointer_set_destroy (seen_args);
6466 /* If there was a previous prototype,
6467 set the DECL_ARG_TYPE of each argument according to
6468 the type previously specified, and report any mismatches. */
6470 if (current_function_prototype_arg_types)
6473 for (parm = DECL_ARGUMENTS (fndecl),
6474 type = current_function_prototype_arg_types;
6475 parm || (type && TREE_VALUE (type) != error_mark_node
6476 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
6477 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6479 if (parm == 0 || type == 0
6480 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6482 if (current_function_prototype_built_in)
6483 warning (0, "number of arguments doesn%'t match "
6484 "built-in prototype");
6487 error ("number of arguments doesn%'t match prototype");
6488 error ("%Hprototype declaration",
6489 ¤t_function_prototype_locus);
6493 /* Type for passing arg must be consistent with that
6494 declared for the arg. ISO C says we take the unqualified
6495 type for parameters declared with qualified type. */
6496 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6497 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6499 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6500 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6502 /* Adjust argument to match prototype. E.g. a previous
6503 `int foo(float);' prototype causes
6504 `int foo(x) float x; {...}' to be treated like
6505 `int foo(float x) {...}'. This is particularly
6506 useful for argument types like uid_t. */
6507 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6509 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6510 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6511 && TYPE_PRECISION (TREE_TYPE (parm))
6512 < TYPE_PRECISION (integer_type_node))
6513 DECL_ARG_TYPE (parm) = integer_type_node;
6517 /* ??? Is it possible to get here with a
6518 built-in prototype or will it always have
6519 been diagnosed as conflicting with an
6520 old-style definition and discarded? */
6521 if (current_function_prototype_built_in)
6522 warning (0, "promoted argument %qD "
6523 "doesn%'t match built-in prototype", parm);
6526 pedwarn ("promoted argument %qD "
6527 "doesn%'t match prototype", parm);
6528 pedwarn ("%Hprototype declaration",
6529 ¤t_function_prototype_locus);
6535 if (current_function_prototype_built_in)
6536 warning (0, "argument %qD doesn%'t match "
6537 "built-in prototype", parm);
6540 error ("argument %qD doesn%'t match prototype", parm);
6541 error ("%Hprototype declaration",
6542 ¤t_function_prototype_locus);
6547 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6550 /* Otherwise, create a prototype that would match. */
6554 tree actual = 0, last = 0, type;
6556 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6558 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6560 TREE_CHAIN (last) = type;
6565 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6567 TREE_CHAIN (last) = type;
6571 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6572 of the type of this function, but we need to avoid having this
6573 affect the types of other similarly-typed functions, so we must
6574 first force the generation of an identical (but separate) type
6575 node for the relevant function type. The new node we create
6576 will be a variant of the main variant of the original function
6579 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6581 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6585 /* Store parameter declarations passed in ARG_INFO into the current
6586 function declaration. */
6589 store_parm_decls_from (struct c_arg_info *arg_info)
6591 current_function_arg_info = arg_info;
6592 store_parm_decls ();
6595 /* Store the parameter declarations into the current function declaration.
6596 This is called after parsing the parameter declarations, before
6597 digesting the body of the function.
6599 For an old-style definition, construct a prototype out of the old-style
6600 parameter declarations and inject it into the function's type. */
6603 store_parm_decls (void)
6605 tree fndecl = current_function_decl;
6608 /* The argument information block for FNDECL. */
6609 struct c_arg_info *arg_info = current_function_arg_info;
6610 current_function_arg_info = 0;
6612 /* True if this definition is written with a prototype. Note:
6613 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6614 list in a function definition as equivalent to (void) -- an
6615 empty argument list specifies the function has no parameters,
6616 but only (void) sets up a prototype for future calls. */
6617 proto = arg_info->types != 0;
6620 store_parm_decls_newstyle (fndecl, arg_info);
6622 store_parm_decls_oldstyle (fndecl, arg_info);
6624 /* The next call to push_scope will be a function body. */
6626 next_is_function_body = true;
6628 /* Write a record describing this function definition to the prototypes
6629 file (if requested). */
6631 gen_aux_info_record (fndecl, 1, 0, proto);
6633 /* Initialize the RTL code for the function. */
6634 allocate_struct_function (fndecl, false);
6636 /* Begin the statement tree for this function. */
6637 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6639 /* ??? Insert the contents of the pending sizes list into the function
6640 to be evaluated. The only reason left to have this is
6641 void foo(int n, int array[n++])
6642 because we throw away the array type in favor of a pointer type, and
6643 thus won't naturally see the SAVE_EXPR containing the increment. All
6644 other pending sizes would be handled by gimplify_parameters. */
6647 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6648 add_stmt (TREE_VALUE (t));
6651 /* Even though we're inside a function body, we still don't want to
6652 call expand_expr to calculate the size of a variable-sized array.
6653 We haven't necessarily assigned RTL to all variables yet, so it's
6654 not safe to try to expand expressions involving them. */
6655 cfun->x_dont_save_pending_sizes_p = 1;
6658 /* Emit diagnostics that require gimple input for detection. Operate on
6659 FNDECL and all its nested functions. */
6662 c_gimple_diagnostics_recursively (tree fndecl)
6664 struct cgraph_node *cgn;
6666 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6667 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6669 /* Notice when OpenMP structured block constraints are violated. */
6671 diagnose_omp_structured_block_errors (fndecl);
6673 /* Finalize all nested functions now. */
6674 cgn = cgraph_node (fndecl);
6675 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6676 c_gimple_diagnostics_recursively (cgn->decl);
6679 /* Finish up a function declaration and compile that function
6680 all the way to assembler language output. The free the storage
6681 for the function definition.
6683 This is called after parsing the body of the function definition. */
6686 finish_function (void)
6688 tree fndecl = current_function_decl;
6690 label_context_stack_se = label_context_stack_se->next;
6691 label_context_stack_vm = label_context_stack_vm->next;
6693 if (TREE_CODE (fndecl) == FUNCTION_DECL
6694 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6696 tree args = DECL_ARGUMENTS (fndecl);
6697 for (; args; args = TREE_CHAIN (args))
6699 tree type = TREE_TYPE (args);
6700 if (INTEGRAL_TYPE_P (type)
6701 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6702 DECL_ARG_TYPE (args) = integer_type_node;
6706 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6707 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6709 /* Must mark the RESULT_DECL as being in this function. */
6711 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6712 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6714 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6716 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6717 != integer_type_node)
6719 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6720 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6722 pedwarn ("return type of %q+D is not %<int%>", fndecl);
6728 tree stmt = c_finish_return (integer_zero_node);
6729 #ifdef USE_MAPPED_LOCATION
6730 /* Hack. We don't want the middle-end to warn that this return
6731 is unreachable, so we mark its location as special. Using
6732 UNKNOWN_LOCATION has the problem that it gets clobbered in
6733 annotate_one_with_locus. A cleaner solution might be to
6734 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6736 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6738 /* Hack. We don't want the middle-end to warn that this
6739 return is unreachable, so put the statement on the
6741 annotate_with_file_line (stmt, input_filename, 0);
6747 /* Tie off the statement tree for this function. */
6748 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6750 finish_fname_decls ();
6752 /* Complain if there's just no return statement. */
6753 if (warn_return_type
6754 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6755 && !current_function_returns_value && !current_function_returns_null
6756 /* Don't complain if we are no-return. */
6757 && !current_function_returns_abnormally
6758 /* Don't warn for main(). */
6759 && !MAIN_NAME_P (DECL_NAME (fndecl))
6760 /* Or if they didn't actually specify a return type. */
6761 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6762 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6763 inline function, as we might never be compiled separately. */
6764 && DECL_INLINE (fndecl))
6766 warning (OPT_Wreturn_type,
6767 "no return statement in function returning non-void");
6768 TREE_NO_WARNING (fndecl) = 1;
6771 /* Store the end of the function, so that we get good line number
6772 info for the epilogue. */
6773 cfun->function_end_locus = input_location;
6775 /* Finalize the ELF visibility for the function. */
6776 c_determine_visibility (fndecl);
6778 /* For GNU C extern inline functions disregard inline limits. */
6779 if (DECL_EXTERNAL (fndecl)
6780 && DECL_DECLARED_INLINE_P (fndecl))
6781 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
6783 /* Genericize before inlining. Delay genericizing nested functions
6784 until their parent function is genericized. Since finalizing
6785 requires GENERIC, delay that as well. */
6787 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6788 && !undef_nested_function)
6790 if (!decl_function_context (fndecl))
6792 c_genericize (fndecl);
6793 c_gimple_diagnostics_recursively (fndecl);
6795 /* ??? Objc emits functions after finalizing the compilation unit.
6796 This should be cleaned up later and this conditional removed. */
6797 if (cgraph_global_info_ready)
6799 cgraph_add_new_function (fndecl, false);
6803 cgraph_finalize_function (fndecl, false);
6807 /* Register this function with cgraph just far enough to get it
6808 added to our parent's nested function list. Handy, since the
6809 C front end doesn't have such a list. */
6810 (void) cgraph_node (fndecl);
6814 if (!decl_function_context (fndecl))
6815 undef_nested_function = false;
6817 /* We're leaving the context of this function, so zap cfun.
6818 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6819 tree_rest_of_compilation. */
6821 current_function_decl = NULL;
6824 /* Check the declarations given in a for-loop for satisfying the C99
6825 constraints. If exactly one such decl is found, return it. */
6828 check_for_loop_decls (void)
6830 struct c_binding *b;
6831 tree one_decl = NULL_TREE;
6837 /* If we get here, declarations have been used in a for loop without
6838 the C99 for loop scope. This doesn't make much sense, so don't
6840 error ("%<for%> loop initial declaration used outside C99 mode");
6843 /* C99 subclause 6.8.5 paragraph 3:
6845 [#3] The declaration part of a for statement shall only
6846 declare identifiers for objects having storage class auto or
6849 It isn't clear whether, in this sentence, "identifiers" binds to
6850 "shall only declare" or to "objects" - that is, whether all identifiers
6851 declared must be identifiers for objects, or whether the restriction
6852 only applies to those that are. (A question on this in comp.std.c
6853 in November 2000 received no answer.) We implement the strictest
6854 interpretation, to avoid creating an extension which later causes
6857 for (b = current_scope->bindings; b; b = b->prev)
6860 tree decl = b->decl;
6865 switch (TREE_CODE (decl))
6868 if (TREE_STATIC (decl))
6869 error ("declaration of static variable %q+D in %<for%> loop "
6870 "initial declaration", decl);
6871 else if (DECL_EXTERNAL (decl))
6872 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6873 "initial declaration", decl);
6877 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6881 error ("%<union %E%> declared in %<for%> loop initial declaration",
6885 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6889 error ("declaration of non-variable %q+D in %<for%> loop "
6890 "initial declaration", decl);
6897 return n_decls == 1 ? one_decl : NULL_TREE;
6900 /* Save and reinitialize the variables
6901 used during compilation of a C function. */
6904 c_push_function_context (struct function *f)
6906 struct language_function *p;
6907 p = GGC_NEW (struct language_function);
6910 p->base.x_stmt_tree = c_stmt_tree;
6911 p->x_break_label = c_break_label;
6912 p->x_cont_label = c_cont_label;
6913 p->x_switch_stack = c_switch_stack;
6914 p->arg_info = current_function_arg_info;
6915 p->returns_value = current_function_returns_value;
6916 p->returns_null = current_function_returns_null;
6917 p->returns_abnormally = current_function_returns_abnormally;
6918 p->warn_about_return_type = warn_about_return_type;
6921 /* Restore the variables used during compilation of a C function. */
6924 c_pop_function_context (struct function *f)
6926 struct language_function *p = f->language;
6928 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6929 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6931 /* Stop pointing to the local nodes about to be freed. */
6932 /* But DECL_INITIAL must remain nonzero so we know this
6933 was an actual function definition. */
6934 DECL_INITIAL (current_function_decl) = error_mark_node;
6935 DECL_ARGUMENTS (current_function_decl) = 0;
6938 c_stmt_tree = p->base.x_stmt_tree;
6939 c_break_label = p->x_break_label;
6940 c_cont_label = p->x_cont_label;
6941 c_switch_stack = p->x_switch_stack;
6942 current_function_arg_info = p->arg_info;
6943 current_function_returns_value = p->returns_value;
6944 current_function_returns_null = p->returns_null;
6945 current_function_returns_abnormally = p->returns_abnormally;
6946 warn_about_return_type = p->warn_about_return_type;
6951 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6954 c_dup_lang_specific_decl (tree decl)
6956 struct lang_decl *ld;
6958 if (!DECL_LANG_SPECIFIC (decl))
6961 ld = GGC_NEW (struct lang_decl);
6962 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6963 DECL_LANG_SPECIFIC (decl) = ld;
6966 /* The functions below are required for functionality of doing
6967 function at once processing in the C front end. Currently these
6968 functions are not called from anywhere in the C front end, but as
6969 these changes continue, that will change. */
6971 /* Returns the stmt_tree (if any) to which statements are currently
6972 being added. If there is no active statement-tree, NULL is
6976 current_stmt_tree (void)
6978 return &c_stmt_tree;
6981 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6985 anon_aggr_type_p (const_tree ARG_UNUSED (node))
6990 /* Return the global value of T as a symbol. */
6993 identifier_global_value (tree t)
6995 struct c_binding *b;
6997 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6998 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
7004 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7005 otherwise the name is found in ridpointers from RID_INDEX. */
7008 record_builtin_type (enum rid rid_index, const char *name, tree type)
7012 id = ridpointers[(int) rid_index];
7014 id = get_identifier (name);
7015 decl = build_decl (TYPE_DECL, id, type);
7017 if (debug_hooks->type_decl)
7018 debug_hooks->type_decl (decl, false);
7021 /* Build the void_list_node (void_type_node having been created). */
7023 build_void_list_node (void)
7025 tree t = build_tree_list (NULL_TREE, void_type_node);
7029 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
7032 build_c_parm (struct c_declspecs *specs, tree attrs,
7033 struct c_declarator *declarator)
7035 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
7038 ret->declarator = declarator;
7042 /* Return a declarator with nested attributes. TARGET is the inner
7043 declarator to which these attributes apply. ATTRS are the
7046 struct c_declarator *
7047 build_attrs_declarator (tree attrs, struct c_declarator *target)
7049 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7050 ret->kind = cdk_attrs;
7051 ret->declarator = target;
7052 ret->u.attrs = attrs;
7056 /* Return a declarator for a function with arguments specified by ARGS
7057 and return type specified by TARGET. */
7059 struct c_declarator *
7060 build_function_declarator (struct c_arg_info *args,
7061 struct c_declarator *target)
7063 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7064 ret->kind = cdk_function;
7065 ret->declarator = target;
7066 ret->u.arg_info = args;
7070 /* Return a declarator for the identifier IDENT (which may be
7071 NULL_TREE for an abstract declarator). */
7073 struct c_declarator *
7074 build_id_declarator (tree ident)
7076 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7078 ret->declarator = 0;
7080 /* Default value - may get reset to a more precise location. */
7081 ret->id_loc = input_location;
7085 /* Return something to represent absolute declarators containing a *.
7086 TARGET is the absolute declarator that the * contains.
7087 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7088 to apply to the pointer type. */
7090 struct c_declarator *
7091 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
7092 struct c_declarator *target)
7096 struct c_declarator *itarget = target;
7097 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7098 if (type_quals_attrs)
7100 attrs = type_quals_attrs->attrs;
7101 quals = quals_from_declspecs (type_quals_attrs);
7102 if (attrs != NULL_TREE)
7103 itarget = build_attrs_declarator (attrs, target);
7105 ret->kind = cdk_pointer;
7106 ret->declarator = itarget;
7107 ret->u.pointer_quals = quals;
7111 /* Return a pointer to a structure for an empty list of declaration
7114 struct c_declspecs *
7115 build_null_declspecs (void)
7117 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
7121 ret->typespec_word = cts_none;
7122 ret->storage_class = csc_none;
7123 ret->declspecs_seen_p = false;
7124 ret->type_seen_p = false;
7125 ret->non_sc_seen_p = false;
7126 ret->typedef_p = false;
7127 ret->tag_defined_p = false;
7128 ret->explicit_signed_p = false;
7129 ret->deprecated_p = false;
7130 ret->default_int_p = false;
7131 ret->long_p = false;
7132 ret->long_long_p = false;
7133 ret->short_p = false;
7134 ret->signed_p = false;
7135 ret->unsigned_p = false;
7136 ret->complex_p = false;
7137 ret->inline_p = false;
7138 ret->thread_p = false;
7139 ret->const_p = false;
7140 ret->volatile_p = false;
7141 ret->restrict_p = false;
7142 ret->saturating_p = false;
7146 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7149 struct c_declspecs *
7150 declspecs_add_qual (struct c_declspecs *specs, tree qual)
7154 specs->non_sc_seen_p = true;
7155 specs->declspecs_seen_p = true;
7156 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
7157 && C_IS_RESERVED_WORD (qual));
7158 i = C_RID_CODE (qual);
7162 dupe = specs->const_p;
7163 specs->const_p = true;
7166 dupe = specs->volatile_p;
7167 specs->volatile_p = true;
7170 dupe = specs->restrict_p;
7171 specs->restrict_p = true;
7176 if (dupe && pedantic && !flag_isoc99)
7177 pedwarn ("duplicate %qE", qual);
7181 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7184 struct c_declspecs *
7185 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7187 tree type = spec.spec;
7188 specs->non_sc_seen_p = true;
7189 specs->declspecs_seen_p = true;
7190 specs->type_seen_p = true;
7191 if (TREE_DEPRECATED (type))
7192 specs->deprecated_p = true;
7194 /* Handle type specifier keywords. */
7195 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
7197 enum rid i = C_RID_CODE (type);
7200 error ("two or more data types in declaration specifiers");
7203 if ((int) i <= (int) RID_LAST_MODIFIER)
7205 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
7210 if (specs->long_long_p)
7212 error ("%<long long long%> is too long for GCC");
7217 if (specs->typespec_word == cts_double)
7219 error ("both %<long long%> and %<double%> in "
7220 "declaration specifiers");
7223 if (pedantic && !flag_isoc99 && !in_system_header
7225 pedwarn ("ISO C90 does not support %<long long%>");
7226 specs->long_long_p = 1;
7230 error ("both %<long%> and %<short%> in "
7231 "declaration specifiers");
7232 else if (specs->typespec_word == cts_void)
7233 error ("both %<long%> and %<void%> in "
7234 "declaration specifiers");
7235 else if (specs->typespec_word == cts_bool)
7236 error ("both %<long%> and %<_Bool%> in "
7237 "declaration specifiers");
7238 else if (specs->typespec_word == cts_char)
7239 error ("both %<long%> and %<char%> in "
7240 "declaration specifiers");
7241 else if (specs->typespec_word == cts_float)
7242 error ("both %<long%> and %<float%> in "
7243 "declaration specifiers");
7244 else if (specs->typespec_word == cts_dfloat32)
7245 error ("both %<long%> and %<_Decimal32%> in "
7246 "declaration specifiers");
7247 else if (specs->typespec_word == cts_dfloat64)
7248 error ("both %<long%> and %<_Decimal64%> in "
7249 "declaration specifiers");
7250 else if (specs->typespec_word == cts_dfloat128)
7251 error ("both %<long%> and %<_Decimal128%> in "
7252 "declaration specifiers");
7254 specs->long_p = true;
7257 dupe = specs->short_p;
7259 error ("both %<long%> and %<short%> in "
7260 "declaration specifiers");
7261 else if (specs->typespec_word == cts_void)
7262 error ("both %<short%> and %<void%> in "
7263 "declaration specifiers");
7264 else if (specs->typespec_word == cts_bool)
7265 error ("both %<short%> and %<_Bool%> in "
7266 "declaration specifiers");
7267 else if (specs->typespec_word == cts_char)
7268 error ("both %<short%> and %<char%> in "
7269 "declaration specifiers");
7270 else if (specs->typespec_word == cts_float)
7271 error ("both %<short%> and %<float%> in "
7272 "declaration specifiers");
7273 else if (specs->typespec_word == cts_double)
7274 error ("both %<short%> and %<double%> in "
7275 "declaration specifiers");
7276 else if (specs->typespec_word == cts_dfloat32)
7277 error ("both %<short%> and %<_Decimal32%> in "
7278 "declaration specifiers");
7279 else if (specs->typespec_word == cts_dfloat64)
7280 error ("both %<short%> and %<_Decimal64%> in "
7281 "declaration specifiers");
7282 else if (specs->typespec_word == cts_dfloat128)
7283 error ("both %<short%> and %<_Decimal128%> in "
7284 "declaration specifiers");
7286 specs->short_p = true;
7289 dupe = specs->signed_p;
7290 if (specs->unsigned_p)
7291 error ("both %<signed%> and %<unsigned%> in "
7292 "declaration specifiers");
7293 else if (specs->typespec_word == cts_void)
7294 error ("both %<signed%> and %<void%> in "
7295 "declaration specifiers");
7296 else if (specs->typespec_word == cts_bool)
7297 error ("both %<signed%> and %<_Bool%> in "
7298 "declaration specifiers");
7299 else if (specs->typespec_word == cts_float)
7300 error ("both %<signed%> and %<float%> in "
7301 "declaration specifiers");
7302 else if (specs->typespec_word == cts_double)
7303 error ("both %<signed%> and %<double%> in "
7304 "declaration specifiers");
7305 else if (specs->typespec_word == cts_dfloat32)
7306 error ("both %<signed%> and %<_Decimal32%> in "
7307 "declaration specifiers");
7308 else if (specs->typespec_word == cts_dfloat64)
7309 error ("both %<signed%> and %<_Decimal64%> in "
7310 "declaration specifiers");
7311 else if (specs->typespec_word == cts_dfloat128)
7312 error ("both %<signed%> and %<_Decimal128%> in "
7313 "declaration specifiers");
7315 specs->signed_p = true;
7318 dupe = specs->unsigned_p;
7319 if (specs->signed_p)
7320 error ("both %<signed%> and %<unsigned%> in "
7321 "declaration specifiers");
7322 else if (specs->typespec_word == cts_void)
7323 error ("both %<unsigned%> and %<void%> in "
7324 "declaration specifiers");
7325 else if (specs->typespec_word == cts_bool)
7326 error ("both %<unsigned%> and %<_Bool%> in "
7327 "declaration specifiers");
7328 else if (specs->typespec_word == cts_float)
7329 error ("both %<unsigned%> and %<float%> in "
7330 "declaration specifiers");
7331 else if (specs->typespec_word == cts_double)
7332 error ("both %<unsigned%> and %<double%> in "
7333 "declaration specifiers");
7334 else if (specs->typespec_word == cts_dfloat32)
7335 error ("both %<unsigned%> and %<_Decimal32%> in "
7336 "declaration specifiers");
7337 else if (specs->typespec_word == cts_dfloat64)
7338 error ("both %<unsigned%> and %<_Decimal64%> in "
7339 "declaration specifiers");
7340 else if (specs->typespec_word == cts_dfloat128)
7341 error ("both %<unsigned%> and %<_Decimal128%> in "
7342 "declaration specifiers");
7344 specs->unsigned_p = true;
7347 dupe = specs->complex_p;
7348 if (pedantic && !flag_isoc99 && !in_system_header)
7349 pedwarn ("ISO C90 does not support complex types");
7350 if (specs->typespec_word == cts_void)
7351 error ("both %<complex%> and %<void%> in "
7352 "declaration specifiers");
7353 else if (specs->typespec_word == cts_bool)
7354 error ("both %<complex%> and %<_Bool%> in "
7355 "declaration specifiers");
7356 else if (specs->typespec_word == cts_dfloat32)
7357 error ("both %<complex%> and %<_Decimal32%> in "
7358 "declaration specifiers");
7359 else if (specs->typespec_word == cts_dfloat64)
7360 error ("both %<complex%> and %<_Decimal64%> in "
7361 "declaration specifiers");
7362 else if (specs->typespec_word == cts_dfloat128)
7363 error ("both %<complex%> and %<_Decimal128%> in "
7364 "declaration specifiers");
7365 else if (specs->typespec_word == cts_fract)
7366 error ("both %<complex%> and %<_Fract%> in "
7367 "declaration specifiers");
7368 else if (specs->typespec_word == cts_accum)
7369 error ("both %<complex%> and %<_Accum%> in "
7370 "declaration specifiers");
7371 else if (specs->saturating_p)
7372 error ("both %<complex%> and %<_Sat%> in "
7373 "declaration specifiers");
7375 specs->complex_p = true;
7378 dupe = specs->saturating_p;
7380 pedwarn ("ISO C does not support saturating types");
7381 if (specs->typespec_word == cts_void)
7382 error ("both %<_Sat%> and %<void%> in "
7383 "declaration specifiers");
7384 else if (specs->typespec_word == cts_bool)
7385 error ("both %<_Sat%> and %<_Bool%> in "
7386 "declaration specifiers");
7387 else if (specs->typespec_word == cts_char)
7388 error ("both %<_Sat%> and %<char%> in "
7389 "declaration specifiers");
7390 else if (specs->typespec_word == cts_int)
7391 error ("both %<_Sat%> and %<int%> in "
7392 "declaration specifiers");
7393 else if (specs->typespec_word == cts_float)
7394 error ("both %<_Sat%> and %<float%> in "
7395 "declaration specifiers");
7396 else if (specs->typespec_word == cts_double)
7397 error ("both %<_Sat%> and %<double%> in "
7398 "declaration specifiers");
7399 else if (specs->typespec_word == cts_dfloat32)
7400 error ("both %<_Sat%> and %<_Decimal32%> in "
7401 "declaration specifiers");
7402 else if (specs->typespec_word == cts_dfloat64)
7403 error ("both %<_Sat%> and %<_Decimal64%> in "
7404 "declaration specifiers");
7405 else if (specs->typespec_word == cts_dfloat128)
7406 error ("both %<_Sat%> and %<_Decimal128%> in "
7407 "declaration specifiers");
7408 else if (specs->complex_p)
7409 error ("both %<_Sat%> and %<complex%> in "
7410 "declaration specifiers");
7412 specs->saturating_p = true;
7419 error ("duplicate %qE", type);
7425 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
7426 "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
7427 if (specs->typespec_word != cts_none)
7429 error ("two or more data types in declaration specifiers");
7436 error ("both %<long%> and %<void%> in "
7437 "declaration specifiers");
7438 else if (specs->short_p)
7439 error ("both %<short%> and %<void%> in "
7440 "declaration specifiers");
7441 else if (specs->signed_p)
7442 error ("both %<signed%> and %<void%> in "
7443 "declaration specifiers");
7444 else if (specs->unsigned_p)
7445 error ("both %<unsigned%> and %<void%> in "
7446 "declaration specifiers");
7447 else if (specs->complex_p)
7448 error ("both %<complex%> and %<void%> in "
7449 "declaration specifiers");
7450 else if (specs->saturating_p)
7451 error ("both %<_Sat%> and %<void%> in "
7452 "declaration specifiers");
7454 specs->typespec_word = cts_void;
7458 error ("both %<long%> and %<_Bool%> in "
7459 "declaration specifiers");
7460 else if (specs->short_p)
7461 error ("both %<short%> and %<_Bool%> in "
7462 "declaration specifiers");
7463 else if (specs->signed_p)
7464 error ("both %<signed%> and %<_Bool%> in "
7465 "declaration specifiers");
7466 else if (specs->unsigned_p)
7467 error ("both %<unsigned%> and %<_Bool%> in "
7468 "declaration specifiers");
7469 else if (specs->complex_p)
7470 error ("both %<complex%> and %<_Bool%> in "
7471 "declaration specifiers");
7472 else if (specs->saturating_p)
7473 error ("both %<_Sat%> and %<_Bool%> in "
7474 "declaration specifiers");
7476 specs->typespec_word = cts_bool;
7480 error ("both %<long%> and %<char%> in "
7481 "declaration specifiers");
7482 else if (specs->short_p)
7483 error ("both %<short%> and %<char%> in "
7484 "declaration specifiers");
7485 else if (specs->saturating_p)
7486 error ("both %<_Sat%> and %<char%> in "
7487 "declaration specifiers");
7489 specs->typespec_word = cts_char;
7492 if (specs->saturating_p)
7493 error ("both %<_Sat%> and %<int%> in "
7494 "declaration specifiers");
7496 specs->typespec_word = cts_int;
7500 error ("both %<long%> and %<float%> in "
7501 "declaration specifiers");
7502 else if (specs->short_p)
7503 error ("both %<short%> and %<float%> in "
7504 "declaration specifiers");
7505 else if (specs->signed_p)
7506 error ("both %<signed%> and %<float%> in "
7507 "declaration specifiers");
7508 else if (specs->unsigned_p)
7509 error ("both %<unsigned%> and %<float%> in "
7510 "declaration specifiers");
7511 else if (specs->saturating_p)
7512 error ("both %<_Sat%> and %<float%> in "
7513 "declaration specifiers");
7515 specs->typespec_word = cts_float;
7518 if (specs->long_long_p)
7519 error ("both %<long long%> and %<double%> in "
7520 "declaration specifiers");
7521 else if (specs->short_p)
7522 error ("both %<short%> and %<double%> in "
7523 "declaration specifiers");
7524 else if (specs->signed_p)
7525 error ("both %<signed%> and %<double%> in "
7526 "declaration specifiers");
7527 else if (specs->unsigned_p)
7528 error ("both %<unsigned%> and %<double%> in "
7529 "declaration specifiers");
7530 else if (specs->saturating_p)
7531 error ("both %<_Sat%> and %<double%> in "
7532 "declaration specifiers");
7534 specs->typespec_word = cts_double;
7541 if (i == RID_DFLOAT32)
7543 else if (i == RID_DFLOAT64)
7546 str = "_Decimal128";
7547 if (specs->long_long_p)
7548 error ("both %<long long%> and %<%s%> in "
7549 "declaration specifiers", str);
7551 error ("both %<long%> and %<%s%> in "
7552 "declaration specifiers", str);
7553 else if (specs->short_p)
7554 error ("both %<short%> and %<%s%> in "
7555 "declaration specifiers", str);
7556 else if (specs->signed_p)
7557 error ("both %<signed%> and %<%s%> in "
7558 "declaration specifiers", str);
7559 else if (specs->unsigned_p)
7560 error ("both %<unsigned%> and %<%s%> in "
7561 "declaration specifiers", str);
7562 else if (specs->complex_p)
7563 error ("both %<complex%> and %<%s%> in "
7564 "declaration specifiers", str);
7565 else if (specs->saturating_p)
7566 error ("both %<_Sat%> and %<%s%> in "
7567 "declaration specifiers", str);
7568 else if (i == RID_DFLOAT32)
7569 specs->typespec_word = cts_dfloat32;
7570 else if (i == RID_DFLOAT64)
7571 specs->typespec_word = cts_dfloat64;
7573 specs->typespec_word = cts_dfloat128;
7575 if (!targetm.decimal_float_supported_p ())
7576 error ("decimal floating point not supported for this target");
7578 pedwarn ("ISO C does not support decimal floating point");
7588 if (specs->complex_p)
7589 error ("both %<complex%> and %<%s%> in "
7590 "declaration specifiers", str);
7591 else if (i == RID_FRACT)
7592 specs->typespec_word = cts_fract;
7594 specs->typespec_word = cts_accum;
7596 if (!targetm.fixed_point_supported_p ())
7597 error ("fixed-point types not supported for this target");
7599 pedwarn ("ISO C does not support fixed-point types");
7602 /* ObjC reserved word "id", handled below. */
7608 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7609 form of ObjC type, cases such as "int" and "long" being handled
7610 above), a TYPE (struct, union, enum and typeof specifiers) or an
7611 ERROR_MARK. In none of these cases may there have previously
7612 been any type specifiers. */
7613 if (specs->type || specs->typespec_word != cts_none
7614 || specs->long_p || specs->short_p || specs->signed_p
7615 || specs->unsigned_p || specs->complex_p)
7616 error ("two or more data types in declaration specifiers");
7617 else if (TREE_CODE (type) == TYPE_DECL)
7619 if (TREE_TYPE (type) == error_mark_node)
7620 ; /* Allow the type to default to int to avoid cascading errors. */
7623 specs->type = TREE_TYPE (type);
7624 specs->decl_attr = DECL_ATTRIBUTES (type);
7625 specs->typedef_p = true;
7626 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7629 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7631 tree t = lookup_name (type);
7632 if (!t || TREE_CODE (t) != TYPE_DECL)
7633 error ("%qE fails to be a typedef or built in type", type);
7634 else if (TREE_TYPE (t) == error_mark_node)
7637 specs->type = TREE_TYPE (t);
7639 else if (TREE_CODE (type) != ERROR_MARK)
7641 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7642 specs->tag_defined_p = true;
7643 if (spec.kind == ctsk_typeof)
7644 specs->typedef_p = true;
7651 /* Add the storage class specifier or function specifier SCSPEC to the
7652 declaration specifiers SPECS, returning SPECS. */
7654 struct c_declspecs *
7655 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7658 enum c_storage_class n = csc_none;
7660 specs->declspecs_seen_p = true;
7661 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7662 && C_IS_RESERVED_WORD (scspec));
7663 i = C_RID_CODE (scspec);
7664 if (specs->non_sc_seen_p)
7665 warning (OPT_Wold_style_declaration,
7666 "%qE is not at beginning of declaration", scspec);
7670 /* C99 permits duplicate inline. Although of doubtful utility,
7671 it seems simplest to permit it in gnu89 mode as well, as
7672 there is also little utility in maintaining this as a
7673 difference between gnu89 and C99 inline. */
7675 specs->inline_p = true;
7678 dupe = specs->thread_p;
7679 if (specs->storage_class == csc_auto)
7680 error ("%<__thread%> used with %<auto%>");
7681 else if (specs->storage_class == csc_register)
7682 error ("%<__thread%> used with %<register%>");
7683 else if (specs->storage_class == csc_typedef)
7684 error ("%<__thread%> used with %<typedef%>");
7686 specs->thread_p = true;
7693 /* Diagnose "__thread extern". */
7694 if (specs->thread_p)
7695 error ("%<__thread%> before %<extern%>");
7702 /* Diagnose "__thread static". */
7703 if (specs->thread_p)
7704 error ("%<__thread%> before %<static%>");
7712 if (n != csc_none && n == specs->storage_class)
7715 error ("duplicate %qE", scspec);
7718 if (specs->storage_class != csc_none && n != specs->storage_class)
7720 error ("multiple storage classes in declaration specifiers");
7724 specs->storage_class = n;
7725 if (n != csc_extern && n != csc_static && specs->thread_p)
7727 error ("%<__thread%> used with %qE", scspec);
7728 specs->thread_p = false;
7735 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7738 struct c_declspecs *
7739 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7741 specs->attrs = chainon (attrs, specs->attrs);
7742 specs->declspecs_seen_p = true;
7746 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7747 specifiers with any other type specifier to determine the resulting
7748 type. This is where ISO C checks on complex types are made, since
7749 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7752 struct c_declspecs *
7753 finish_declspecs (struct c_declspecs *specs)
7755 /* If a type was specified as a whole, we have no modifiers and are
7757 if (specs->type != NULL_TREE)
7759 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7760 && !specs->signed_p && !specs->unsigned_p
7761 && !specs->complex_p);
7765 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7766 has been specified, treat it as "int" unless "_Complex" is
7767 present and there are no other specifiers. If we just have
7768 "_Complex", it is equivalent to "_Complex double", but e.g.
7769 "_Complex short" is equivalent to "_Complex short int". */
7770 if (specs->typespec_word == cts_none)
7772 if (specs->saturating_p)
7774 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
7775 specs->typespec_word = cts_fract;
7777 else if (specs->long_p || specs->short_p
7778 || specs->signed_p || specs->unsigned_p)
7780 specs->typespec_word = cts_int;
7782 else if (specs->complex_p)
7784 specs->typespec_word = cts_double;
7786 pedwarn ("ISO C does not support plain %<complex%> meaning "
7787 "%<double complex%>");
7791 specs->typespec_word = cts_int;
7792 specs->default_int_p = true;
7793 /* We don't diagnose this here because grokdeclarator will
7794 give more specific diagnostics according to whether it is
7795 a function definition. */
7799 /* If "signed" was specified, record this to distinguish "int" and
7800 "signed int" in the case of a bit-field with
7801 -funsigned-bitfields. */
7802 specs->explicit_signed_p = specs->signed_p;
7804 /* Now compute the actual type. */
7805 switch (specs->typespec_word)
7808 gcc_assert (!specs->long_p && !specs->short_p
7809 && !specs->signed_p && !specs->unsigned_p
7810 && !specs->complex_p);
7811 specs->type = void_type_node;
7814 gcc_assert (!specs->long_p && !specs->short_p
7815 && !specs->signed_p && !specs->unsigned_p
7816 && !specs->complex_p);
7817 specs->type = boolean_type_node;
7820 gcc_assert (!specs->long_p && !specs->short_p);
7821 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7822 if (specs->signed_p)
7823 specs->type = signed_char_type_node;
7824 else if (specs->unsigned_p)
7825 specs->type = unsigned_char_type_node;
7827 specs->type = char_type_node;
7828 if (specs->complex_p)
7831 pedwarn ("ISO C does not support complex integer types");
7832 specs->type = build_complex_type (specs->type);
7836 gcc_assert (!(specs->long_p && specs->short_p));
7837 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7838 if (specs->long_long_p)
7839 specs->type = (specs->unsigned_p
7840 ? long_long_unsigned_type_node
7841 : long_long_integer_type_node);
7842 else if (specs->long_p)
7843 specs->type = (specs->unsigned_p
7844 ? long_unsigned_type_node
7845 : long_integer_type_node);
7846 else if (specs->short_p)
7847 specs->type = (specs->unsigned_p
7848 ? short_unsigned_type_node
7849 : short_integer_type_node);
7851 specs->type = (specs->unsigned_p
7852 ? unsigned_type_node
7853 : integer_type_node);
7854 if (specs->complex_p)
7857 pedwarn ("ISO C does not support complex integer types");
7858 specs->type = build_complex_type (specs->type);
7862 gcc_assert (!specs->long_p && !specs->short_p
7863 && !specs->signed_p && !specs->unsigned_p);
7864 specs->type = (specs->complex_p
7865 ? complex_float_type_node
7869 gcc_assert (!specs->long_long_p && !specs->short_p
7870 && !specs->signed_p && !specs->unsigned_p);
7873 specs->type = (specs->complex_p
7874 ? complex_long_double_type_node
7875 : long_double_type_node);
7879 specs->type = (specs->complex_p
7880 ? complex_double_type_node
7881 : double_type_node);
7887 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7888 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
7889 if (specs->typespec_word == cts_dfloat32)
7890 specs->type = dfloat32_type_node;
7891 else if (specs->typespec_word == cts_dfloat64)
7892 specs->type = dfloat64_type_node;
7894 specs->type = dfloat128_type_node;
7897 gcc_assert (!specs->complex_p);
7898 if (specs->saturating_p)
7900 if (specs->long_long_p)
7901 specs->type = specs->unsigned_p
7902 ? sat_unsigned_long_long_fract_type_node
7903 : sat_long_long_fract_type_node;
7904 else if (specs->long_p)
7905 specs->type = specs->unsigned_p
7906 ? sat_unsigned_long_fract_type_node
7907 : sat_long_fract_type_node;
7908 else if (specs->short_p)
7909 specs->type = specs->unsigned_p
7910 ? sat_unsigned_short_fract_type_node
7911 : sat_short_fract_type_node;
7913 specs->type = specs->unsigned_p
7914 ? sat_unsigned_fract_type_node
7915 : sat_fract_type_node;
7919 if (specs->long_long_p)
7920 specs->type = specs->unsigned_p
7921 ? unsigned_long_long_fract_type_node
7922 : long_long_fract_type_node;
7923 else if (specs->long_p)
7924 specs->type = specs->unsigned_p
7925 ? unsigned_long_fract_type_node
7926 : long_fract_type_node;
7927 else if (specs->short_p)
7928 specs->type = specs->unsigned_p
7929 ? unsigned_short_fract_type_node
7930 : short_fract_type_node;
7932 specs->type = specs->unsigned_p
7933 ? unsigned_fract_type_node
7938 gcc_assert (!specs->complex_p);
7939 if (specs->saturating_p)
7941 if (specs->long_long_p)
7942 specs->type = specs->unsigned_p
7943 ? sat_unsigned_long_long_accum_type_node
7944 : sat_long_long_accum_type_node;
7945 else if (specs->long_p)
7946 specs->type = specs->unsigned_p
7947 ? sat_unsigned_long_accum_type_node
7948 : sat_long_accum_type_node;
7949 else if (specs->short_p)
7950 specs->type = specs->unsigned_p
7951 ? sat_unsigned_short_accum_type_node
7952 : sat_short_accum_type_node;
7954 specs->type = specs->unsigned_p
7955 ? sat_unsigned_accum_type_node
7956 : sat_accum_type_node;
7960 if (specs->long_long_p)
7961 specs->type = specs->unsigned_p
7962 ? unsigned_long_long_accum_type_node
7963 : long_long_accum_type_node;
7964 else if (specs->long_p)
7965 specs->type = specs->unsigned_p
7966 ? unsigned_long_accum_type_node
7967 : long_accum_type_node;
7968 else if (specs->short_p)
7969 specs->type = specs->unsigned_p
7970 ? unsigned_short_accum_type_node
7971 : short_accum_type_node;
7973 specs->type = specs->unsigned_p
7974 ? unsigned_accum_type_node
7985 /* A subroutine of c_write_global_declarations. Perform final processing
7986 on one file scope's declarations (or the external scope's declarations),
7990 c_write_global_declarations_1 (tree globals)
7995 /* Process the decls in the order they were written. */
7996 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7998 /* Check for used but undefined static functions using the C
7999 standard's definition of "used", and set TREE_NO_WARNING so
8000 that check_global_declarations doesn't repeat the check. */
8001 if (TREE_CODE (decl) == FUNCTION_DECL
8002 && DECL_INITIAL (decl) == 0
8003 && DECL_EXTERNAL (decl)
8004 && !TREE_PUBLIC (decl)
8005 && C_DECL_USED (decl))
8007 pedwarn ("%q+F used but never defined", decl);
8008 TREE_NO_WARNING (decl) = 1;
8011 wrapup_global_declaration_1 (decl);
8017 for (decl = globals; decl; decl = TREE_CHAIN (decl))
8018 reconsider |= wrapup_global_declaration_2 (decl);
8022 for (decl = globals; decl; decl = TREE_CHAIN (decl))
8023 check_global_declaration_1 (decl);
8026 /* A subroutine of c_write_global_declarations Emit debug information for each
8027 of the declarations in GLOBALS. */
8030 c_write_global_declarations_2 (tree globals)
8034 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
8035 debug_hooks->global_decl (decl);
8038 /* Preserve the external declarations scope across a garbage collect. */
8039 static GTY(()) tree ext_block;
8042 c_write_global_declarations (void)
8046 /* We don't want to do this if generating a PCH. */
8050 /* Don't waste time on further processing if -fsyntax-only or we've
8051 encountered errors. */
8052 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
8055 /* Close the external scope. */
8056 ext_block = pop_scope ();
8058 gcc_assert (!current_scope);
8062 tree tmp = BLOCK_VARS (ext_block);
8064 FILE * stream = dump_begin (TDI_tu, &flags);
8067 dump_node (tmp, flags & ~TDF_SLIM, stream);
8068 dump_end (TDI_tu, stream);
8072 /* Process all file scopes in this compilation, and the external_scope,
8073 through wrapup_global_declarations and check_global_declarations. */
8074 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8075 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
8076 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
8078 /* We're done parsing; proceed to optimize and emit assembly.
8079 FIXME: shouldn't be the front end's responsibility to call this. */
8082 /* After cgraph has had a chance to emit everything that's going to
8083 be emitted, output debug information for globals. */
8084 if (errorcount == 0 && sorrycount == 0)
8086 timevar_push (TV_SYMOUT);
8087 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8088 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
8089 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
8090 timevar_pop (TV_SYMOUT);
8096 #include "gt-c-decl.h"