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) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
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 (0, "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 ();
935 /* Push a definition or a declaration of struct, union or enum tag "name".
936 "type" should be the type node.
937 We assume that the tag "name" is not already defined.
939 Note that the definition may really be just a forward reference.
940 In that case, the TYPE_SIZE will be zero. */
943 pushtag (tree name, tree type)
945 /* Record the identifier as the type's name if it has none. */
946 if (name && !TYPE_NAME (type))
947 TYPE_NAME (type) = name;
948 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
950 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
951 tagged type we just added to the current scope. This fake
952 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
953 to output a representation of a tagged type, and it also gives
954 us a convenient place to record the "scope start" address for the
957 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
959 /* An approximation for now, so we can tell this is a function-scope tag.
960 This will be updated in pop_scope. */
961 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
964 /* Subroutine of compare_decls. Allow harmless mismatches in return
965 and argument types provided that the type modes match. This function
966 return a unified type given a suitable match, and 0 otherwise. */
969 match_builtin_function_types (tree newtype, tree oldtype)
971 tree newrettype, oldrettype;
972 tree newargs, oldargs;
973 tree trytype, tryargs;
975 /* Accept the return type of the new declaration if same modes. */
976 oldrettype = TREE_TYPE (oldtype);
977 newrettype = TREE_TYPE (newtype);
979 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
982 oldargs = TYPE_ARG_TYPES (oldtype);
983 newargs = TYPE_ARG_TYPES (newtype);
986 while (oldargs || newargs)
990 || !TREE_VALUE (oldargs)
991 || !TREE_VALUE (newargs)
992 || TYPE_MODE (TREE_VALUE (oldargs))
993 != TYPE_MODE (TREE_VALUE (newargs)))
996 oldargs = TREE_CHAIN (oldargs);
997 newargs = TREE_CHAIN (newargs);
1000 trytype = build_function_type (newrettype, tryargs);
1001 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1004 /* Subroutine of diagnose_mismatched_decls. Check for function type
1005 mismatch involving an empty arglist vs a nonempty one and give clearer
1008 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1009 tree newtype, tree oldtype)
1013 if (TREE_CODE (olddecl) != FUNCTION_DECL
1014 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1015 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1017 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1020 t = TYPE_ARG_TYPES (oldtype);
1022 t = TYPE_ARG_TYPES (newtype);
1023 for (; t; t = TREE_CHAIN (t))
1025 tree type = TREE_VALUE (t);
1027 if (TREE_CHAIN (t) == 0
1028 && TYPE_MAIN_VARIANT (type) != void_type_node)
1030 inform ("a parameter list with an ellipsis can%'t match "
1031 "an empty parameter name list declaration");
1035 if (c_type_promotes_to (type) != type)
1037 inform ("an argument type that has a default promotion can%'t match "
1038 "an empty parameter name list declaration");
1044 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1045 old-style function definition, NEWDECL is a prototype declaration.
1046 Diagnose inconsistencies in the argument list. Returns TRUE if
1047 the prototype is compatible, FALSE if not. */
1049 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1051 tree newargs, oldargs;
1054 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1056 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1057 newargs = TYPE_ARG_TYPES (newtype);
1062 tree oldargtype = TREE_VALUE (oldargs);
1063 tree newargtype = TREE_VALUE (newargs);
1065 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1068 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1069 newargtype = TYPE_MAIN_VARIANT (newargtype);
1071 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1074 /* Reaching the end of just one list means the two decls don't
1075 agree on the number of arguments. */
1076 if (END_OF_ARGLIST (oldargtype))
1078 error ("prototype for %q+D declares more arguments "
1079 "than previous old-style definition", newdecl);
1082 else if (END_OF_ARGLIST (newargtype))
1084 error ("prototype for %q+D declares fewer arguments "
1085 "than previous old-style definition", newdecl);
1089 /* Type for passing arg must be consistent with that declared
1091 else if (!comptypes (oldargtype, newargtype))
1093 error ("prototype for %q+D declares argument %d"
1094 " with incompatible type",
1099 oldargs = TREE_CHAIN (oldargs);
1100 newargs = TREE_CHAIN (newargs);
1104 /* If we get here, no errors were found, but do issue a warning
1105 for this poor-style construct. */
1106 warning (0, "prototype for %q+D follows non-prototype definition",
1109 #undef END_OF_ARGLIST
1112 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1113 first in a pair of mismatched declarations, using the diagnostic
1116 locate_old_decl (tree decl, void (*diag)(const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2))
1118 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1120 else if (DECL_INITIAL (decl))
1121 diag (G_("previous definition of %q+D was here"), decl);
1122 else if (C_DECL_IMPLICIT (decl))
1123 diag (G_("previous implicit declaration of %q+D was here"), decl);
1125 diag (G_("previous declaration of %q+D was here"), decl);
1128 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1129 Returns true if the caller should proceed to merge the two, false
1130 if OLDDECL should simply be discarded. As a side effect, issues
1131 all necessary diagnostics for invalid or poor-style combinations.
1132 If it returns true, writes the types of NEWDECL and OLDDECL to
1133 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1134 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1137 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1138 tree *newtypep, tree *oldtypep)
1140 tree newtype, oldtype;
1141 bool pedwarned = false;
1142 bool warned = false;
1145 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1146 && DECL_EXTERNAL (DECL))
1148 /* If we have error_mark_node for either decl or type, just discard
1149 the previous decl - we're in an error cascade already. */
1150 if (olddecl == error_mark_node || newdecl == error_mark_node)
1152 *oldtypep = oldtype = TREE_TYPE (olddecl);
1153 *newtypep = newtype = TREE_TYPE (newdecl);
1154 if (oldtype == error_mark_node || newtype == error_mark_node)
1157 /* Two different categories of symbol altogether. This is an error
1158 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1159 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1161 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1162 && DECL_BUILT_IN (olddecl)
1163 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1165 error ("%q+D redeclared as different kind of symbol", newdecl);
1166 locate_old_decl (olddecl, error);
1168 else if (TREE_PUBLIC (newdecl))
1169 warning (0, "built-in function %q+D declared as non-function",
1172 warning (OPT_Wshadow, "declaration of %q+D shadows "
1173 "a built-in function", newdecl);
1177 /* Enumerators have no linkage, so may only be declared once in a
1179 if (TREE_CODE (olddecl) == CONST_DECL)
1181 error ("redeclaration of enumerator %q+D", newdecl);
1182 locate_old_decl (olddecl, error);
1186 if (!comptypes (oldtype, newtype))
1188 if (TREE_CODE (olddecl) == FUNCTION_DECL
1189 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1191 /* Accept harmless mismatch in function types.
1192 This is for the ffs and fprintf builtins. */
1193 tree trytype = match_builtin_function_types (newtype, oldtype);
1195 if (trytype && comptypes (newtype, trytype))
1196 *oldtypep = oldtype = trytype;
1199 /* If types don't match for a built-in, throw away the
1200 built-in. No point in calling locate_old_decl here, it
1201 won't print anything. */
1202 warning (0, "conflicting types for built-in function %q+D",
1207 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1208 && DECL_IS_BUILTIN (olddecl))
1210 /* A conflicting function declaration for a predeclared
1211 function that isn't actually built in. Objective C uses
1212 these. The new declaration silently overrides everything
1213 but the volatility (i.e. noreturn) indication. See also
1214 below. FIXME: Make Objective C use normal builtins. */
1215 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1218 /* Permit void foo (...) to match int foo (...) if the latter is
1219 the definition and implicit int was used. See
1220 c-torture/compile/920625-2.c. */
1221 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1222 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1223 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1224 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1226 pedwarn (0, "conflicting types for %q+D", newdecl);
1227 /* Make sure we keep void as the return type. */
1228 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1229 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1232 /* Permit void foo (...) to match an earlier call to foo (...) with
1233 no declared type (thus, implicitly int). */
1234 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1235 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1236 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1237 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1239 pedwarn (0, "conflicting types for %q+D", newdecl);
1240 /* Make sure we keep void as the return type. */
1241 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1246 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1247 error ("conflicting type qualifiers for %q+D", newdecl);
1249 error ("conflicting types for %q+D", newdecl);
1250 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1251 locate_old_decl (olddecl, error);
1256 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1257 but silently ignore the redeclaration if either is in a system
1258 header. (Conflicting redeclarations were handled above.) */
1259 if (TREE_CODE (newdecl) == TYPE_DECL)
1261 if (DECL_IN_SYSTEM_HEADER (newdecl)
1262 || DECL_IN_SYSTEM_HEADER (olddecl)
1263 || TREE_NO_WARNING (newdecl)
1264 || TREE_NO_WARNING (olddecl))
1265 return true; /* Allow OLDDECL to continue in use. */
1267 error ("redefinition of typedef %q+D", newdecl);
1268 locate_old_decl (olddecl, error);
1272 /* Function declarations can either be 'static' or 'extern' (no
1273 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1274 can never conflict with each other on account of linkage
1275 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1276 gnu89 mode permits two definitions if one is 'extern inline' and
1277 one is not. The non- extern-inline definition supersedes the
1278 extern-inline definition. */
1280 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1282 /* If you declare a built-in function name as static, or
1283 define the built-in with an old-style definition (so we
1284 can't validate the argument list) the built-in definition is
1285 overridden, but optionally warn this was a bad choice of name. */
1286 if (DECL_BUILT_IN (olddecl)
1287 && !C_DECL_DECLARED_BUILTIN (olddecl)
1288 && (!TREE_PUBLIC (newdecl)
1289 || (DECL_INITIAL (newdecl)
1290 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1292 warning (OPT_Wshadow, "declaration of %q+D shadows "
1293 "a built-in function", newdecl);
1294 /* Discard the old built-in function. */
1298 if (DECL_INITIAL (newdecl))
1300 if (DECL_INITIAL (olddecl))
1302 /* If both decls are in the same TU and the new declaration
1303 isn't overriding an extern inline reject the new decl.
1304 In c99, no overriding is allowed in the same translation
1306 if ((!DECL_EXTERN_INLINE (olddecl)
1307 || DECL_EXTERN_INLINE (newdecl)
1308 || (!flag_gnu89_inline
1309 && (!DECL_DECLARED_INLINE_P (olddecl)
1310 || !lookup_attribute ("gnu_inline",
1311 DECL_ATTRIBUTES (olddecl)))
1312 && (!DECL_DECLARED_INLINE_P (newdecl)
1313 || !lookup_attribute ("gnu_inline",
1314 DECL_ATTRIBUTES (newdecl))))
1316 && same_translation_unit_p (newdecl, olddecl))
1318 error ("redefinition of %q+D", newdecl);
1319 locate_old_decl (olddecl, error);
1324 /* If we have a prototype after an old-style function definition,
1325 the argument types must be checked specially. */
1326 else if (DECL_INITIAL (olddecl)
1327 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1328 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1329 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1331 locate_old_decl (olddecl, error);
1334 /* A non-static declaration (even an "extern") followed by a
1335 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1336 The same is true for a static forward declaration at block
1337 scope followed by a non-static declaration/definition at file
1338 scope. Static followed by non-static at the same scope is
1339 not undefined behavior, and is the most convenient way to get
1340 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1341 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1342 we do diagnose it if -Wtraditional. */
1343 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1345 /* Two exceptions to the rule. If olddecl is an extern
1346 inline, or a predeclared function that isn't actually
1347 built in, newdecl silently overrides olddecl. The latter
1348 occur only in Objective C; see also above. (FIXME: Make
1349 Objective C use normal builtins.) */
1350 if (!DECL_IS_BUILTIN (olddecl)
1351 && !DECL_EXTERN_INLINE (olddecl))
1353 error ("static declaration of %q+D follows "
1354 "non-static declaration", newdecl);
1355 locate_old_decl (olddecl, error);
1359 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1361 if (DECL_CONTEXT (olddecl))
1363 error ("non-static declaration of %q+D follows "
1364 "static declaration", newdecl);
1365 locate_old_decl (olddecl, error);
1368 else if (warn_traditional)
1370 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1371 "follows static declaration", newdecl);
1376 /* Make sure gnu_inline attribute is either not present, or
1377 present on all inline decls. */
1378 if (DECL_DECLARED_INLINE_P (olddecl)
1379 && DECL_DECLARED_INLINE_P (newdecl))
1381 bool newa = lookup_attribute ("gnu_inline",
1382 DECL_ATTRIBUTES (newdecl)) != NULL;
1383 bool olda = lookup_attribute ("gnu_inline",
1384 DECL_ATTRIBUTES (olddecl)) != NULL;
1387 error ("%<gnu_inline%> attribute present on %q+D",
1388 newa ? newdecl : olddecl);
1389 error ("%Jbut not here", newa ? olddecl : newdecl);
1393 else if (TREE_CODE (newdecl) == VAR_DECL)
1395 /* Only variables can be thread-local, and all declarations must
1396 agree on this property. */
1397 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1399 /* Nothing to check. Since OLDDECL is marked threadprivate
1400 and NEWDECL does not have a thread-local attribute, we
1401 will merge the threadprivate attribute into NEWDECL. */
1404 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1406 if (DECL_THREAD_LOCAL_P (newdecl))
1407 error ("thread-local declaration of %q+D follows "
1408 "non-thread-local declaration", newdecl);
1410 error ("non-thread-local declaration of %q+D follows "
1411 "thread-local declaration", newdecl);
1413 locate_old_decl (olddecl, error);
1417 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1418 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1420 error ("redefinition of %q+D", newdecl);
1421 locate_old_decl (olddecl, error);
1425 /* Objects declared at file scope: if the first declaration had
1426 external linkage (even if it was an external reference) the
1427 second must have external linkage as well, or the behavior is
1428 undefined. If the first declaration had internal linkage, then
1429 the second must too, or else be an external reference (in which
1430 case the composite declaration still has internal linkage).
1431 As for function declarations, we warn about the static-then-
1432 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1433 if (DECL_FILE_SCOPE_P (newdecl)
1434 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1436 if (DECL_EXTERNAL (newdecl))
1438 if (!DECL_FILE_SCOPE_P (olddecl))
1440 error ("extern declaration of %q+D follows "
1441 "declaration with no linkage", newdecl);
1442 locate_old_decl (olddecl, error);
1445 else if (warn_traditional)
1447 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1448 "follows static declaration", newdecl);
1454 if (TREE_PUBLIC (newdecl))
1455 error ("non-static declaration of %q+D follows "
1456 "static declaration", newdecl);
1458 error ("static declaration of %q+D follows "
1459 "non-static declaration", newdecl);
1461 locate_old_decl (olddecl, error);
1465 /* Two objects with the same name declared at the same block
1466 scope must both be external references (6.7p3). */
1467 else if (!DECL_FILE_SCOPE_P (newdecl))
1469 if (DECL_EXTERNAL (newdecl))
1471 /* Extern with initializer at block scope, which will
1472 already have received an error. */
1474 else if (DECL_EXTERNAL (olddecl))
1476 error ("declaration of %q+D with no linkage follows "
1477 "extern declaration", newdecl);
1478 locate_old_decl (olddecl, error);
1482 error ("redeclaration of %q+D with no linkage", newdecl);
1483 locate_old_decl (olddecl, error);
1491 /* All decls must agree on a visibility. */
1492 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
1493 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1494 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1496 warning (0, "redeclaration of %q+D with different visibility "
1497 "(old visibility preserved)", newdecl);
1501 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1503 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1504 if (DECL_DECLARED_INLINE_P (newdecl)
1505 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1507 warning (OPT_Wattributes, "inline declaration of %qD follows "
1508 "declaration with attribute noinline", newdecl);
1511 else if (DECL_DECLARED_INLINE_P (olddecl)
1512 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1514 warning (OPT_Wattributes, "declaration of %q+D with attribute "
1515 "noinline follows inline declaration ", newdecl);
1519 /* Inline declaration after use or definition.
1520 ??? Should we still warn about this now we have unit-at-a-time
1521 mode and can get it right?
1522 Definitely don't complain if the decls are in different translation
1524 C99 permits this, so don't warn in that case. (The function
1525 may not be inlined everywhere in function-at-a-time mode, but
1526 we still shouldn't warn.) */
1527 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1528 && same_translation_unit_p (olddecl, newdecl)
1529 && flag_gnu89_inline)
1531 if (TREE_USED (olddecl))
1533 warning (0, "%q+D declared inline after being called", olddecl);
1536 else if (DECL_INITIAL (olddecl))
1538 warning (0, "%q+D declared inline after its definition", olddecl);
1543 else /* PARM_DECL, VAR_DECL */
1545 /* Redeclaration of a parameter is a constraint violation (this is
1546 not explicitly stated, but follows from C99 6.7p3 [no more than
1547 one declaration of the same identifier with no linkage in the
1548 same scope, except type tags] and 6.2.2p6 [parameters have no
1549 linkage]). We must check for a forward parameter declaration,
1550 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1551 an extension, the mandatory diagnostic for which is handled by
1552 mark_forward_parm_decls. */
1554 if (TREE_CODE (newdecl) == PARM_DECL
1555 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1557 error ("redefinition of parameter %q+D", newdecl);
1558 locate_old_decl (olddecl, error);
1563 /* Optional warning for completely redundant decls. */
1564 if (!warned && !pedwarned
1565 && warn_redundant_decls
1566 /* Don't warn about a function declaration followed by a
1568 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1569 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1570 /* Don't warn about redundant redeclarations of builtins. */
1571 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1572 && !DECL_BUILT_IN (newdecl)
1573 && DECL_BUILT_IN (olddecl)
1574 && !C_DECL_DECLARED_BUILTIN (olddecl))
1575 /* Don't warn about an extern followed by a definition. */
1576 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1577 /* Don't warn about forward parameter decls. */
1578 && !(TREE_CODE (newdecl) == PARM_DECL
1579 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1580 /* Don't warn about a variable definition following a declaration. */
1581 && !(TREE_CODE (newdecl) == VAR_DECL
1582 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
1584 warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
1589 /* Report location of previous decl/defn in a consistent manner. */
1590 if (warned || pedwarned)
1591 locate_old_decl (olddecl, pedwarned ? pedwarn0 : warning0);
1593 #undef DECL_EXTERN_INLINE
1598 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1599 consistent with OLDDECL, but carries new information. Merge the
1600 new information into OLDDECL. This function issues no
1604 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1606 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1607 && DECL_INITIAL (newdecl) != 0);
1608 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
1609 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
1610 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
1611 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
1612 bool extern_changed = false;
1614 /* For real parm decl following a forward decl, rechain the old decl
1615 in its new location and clear TREE_ASM_WRITTEN (it's not a
1616 forward decl anymore). */
1617 if (TREE_CODE (newdecl) == PARM_DECL
1618 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1620 struct c_binding *b, **here;
1622 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1623 if ((*here)->decl == olddecl)
1630 b->prev = current_scope->bindings;
1631 current_scope->bindings = b;
1633 TREE_ASM_WRITTEN (olddecl) = 0;
1636 DECL_ATTRIBUTES (newdecl)
1637 = targetm.merge_decl_attributes (olddecl, newdecl);
1639 /* Merge the data types specified in the two decls. */
1641 = TREE_TYPE (olddecl)
1642 = composite_type (newtype, oldtype);
1644 /* Lay the type out, unless already done. */
1645 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1647 if (TREE_TYPE (newdecl) != error_mark_node)
1648 layout_type (TREE_TYPE (newdecl));
1649 if (TREE_CODE (newdecl) != FUNCTION_DECL
1650 && TREE_CODE (newdecl) != TYPE_DECL
1651 && TREE_CODE (newdecl) != CONST_DECL)
1652 layout_decl (newdecl, 0);
1656 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1657 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1658 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1659 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1660 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1662 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1663 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
1667 /* Keep the old rtl since we can safely use it. */
1668 if (HAS_RTL_P (olddecl))
1669 COPY_DECL_RTL (olddecl, newdecl);
1671 /* Merge the type qualifiers. */
1672 if (TREE_READONLY (newdecl))
1673 TREE_READONLY (olddecl) = 1;
1675 if (TREE_THIS_VOLATILE (newdecl))
1676 TREE_THIS_VOLATILE (olddecl) = 1;
1678 /* Merge deprecatedness. */
1679 if (TREE_DEPRECATED (newdecl))
1680 TREE_DEPRECATED (olddecl) = 1;
1682 /* If a decl is in a system header and the other isn't, keep the one on the
1683 system header. Otherwise, keep source location of definition rather than
1684 declaration and of prototype rather than non-prototype unless that
1685 prototype is built-in. */
1686 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
1687 && DECL_IN_SYSTEM_HEADER (olddecl)
1688 && !DECL_IN_SYSTEM_HEADER (newdecl) )
1689 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1690 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
1691 && DECL_IN_SYSTEM_HEADER (newdecl)
1692 && !DECL_IN_SYSTEM_HEADER (olddecl))
1693 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
1694 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1695 || (old_is_prototype && !new_is_prototype
1696 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1697 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1699 /* Merge the initialization information. */
1700 if (DECL_INITIAL (newdecl) == 0)
1701 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1703 /* Merge the threadprivate attribute. */
1704 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
1706 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1707 C_DECL_THREADPRIVATE_P (newdecl) = 1;
1710 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1712 /* Merge the section attribute.
1713 We want to issue an error if the sections conflict but that
1714 must be done later in decl_attributes since we are called
1715 before attributes are assigned. */
1716 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1717 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1719 /* Copy the assembler name.
1720 Currently, it can only be defined in the prototype. */
1721 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1723 /* Use visibility of whichever declaration had it specified */
1724 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1726 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1727 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1730 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1732 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1733 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1734 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1735 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1736 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1737 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1738 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1739 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1740 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1741 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1742 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1745 /* Merge the storage class information. */
1746 merge_weak (newdecl, olddecl);
1748 /* For functions, static overrides non-static. */
1749 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1751 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1752 /* This is since we don't automatically
1753 copy the attributes of NEWDECL into OLDDECL. */
1754 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1755 /* If this clears `static', clear it in the identifier too. */
1756 if (!TREE_PUBLIC (olddecl))
1757 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1761 /* In c99, 'extern' declaration before (or after) 'inline' means this
1762 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1764 if (TREE_CODE (newdecl) == FUNCTION_DECL
1765 && !flag_gnu89_inline
1766 && (DECL_DECLARED_INLINE_P (newdecl)
1767 || DECL_DECLARED_INLINE_P (olddecl))
1768 && (!DECL_DECLARED_INLINE_P (newdecl)
1769 || !DECL_DECLARED_INLINE_P (olddecl)
1770 || !DECL_EXTERNAL (olddecl))
1771 && DECL_EXTERNAL (newdecl)
1772 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
1773 && !current_function_decl)
1774 DECL_EXTERNAL (newdecl) = 0;
1776 if (DECL_EXTERNAL (newdecl))
1778 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1779 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1781 /* An extern decl does not override previous storage class. */
1782 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1783 if (!DECL_EXTERNAL (newdecl))
1785 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1786 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1791 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1792 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1795 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1797 /* If we're redefining a function previously defined as extern
1798 inline, make sure we emit debug info for the inline before we
1799 throw it away, in case it was inlined into a function that
1800 hasn't been written out yet. */
1801 if (new_is_definition && DECL_INITIAL (olddecl))
1803 if (TREE_USED (olddecl)
1804 /* In unit-at-a-time mode we never inline re-defined extern
1805 inline functions. */
1806 && !flag_unit_at_a_time
1807 && cgraph_function_possibly_inlined_p (olddecl))
1808 (*debug_hooks->outlining_inline_function) (olddecl);
1810 /* The new defn must not be inline. */
1811 DECL_INLINE (newdecl) = 0;
1812 DECL_UNINLINABLE (newdecl) = 1;
1816 /* If either decl says `inline', this fn is inline, unless
1817 its definition was passed already. */
1818 if (DECL_DECLARED_INLINE_P (newdecl)
1819 || DECL_DECLARED_INLINE_P (olddecl))
1820 DECL_DECLARED_INLINE_P (newdecl) = 1;
1822 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1823 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1825 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1826 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1827 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1828 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1831 if (DECL_BUILT_IN (olddecl))
1833 /* If redeclaring a builtin function, it stays built in.
1834 But it gets tagged as having been declared. */
1835 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1836 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1837 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1838 if (new_is_prototype)
1839 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1841 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1842 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1845 /* Preserve function specific target and optimization options */
1846 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1847 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1848 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1849 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1851 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1852 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1853 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1854 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1856 /* Also preserve various other info from the definition. */
1857 if (!new_is_definition)
1859 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1860 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1861 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1862 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1863 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1865 /* Set DECL_INLINE on the declaration if we've got a body
1866 from which to instantiate. */
1867 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1869 DECL_INLINE (newdecl) = 1;
1870 DECL_ABSTRACT_ORIGIN (newdecl)
1871 = DECL_ABSTRACT_ORIGIN (olddecl);
1876 /* If a previous declaration said inline, mark the
1877 definition as inlinable. */
1878 if (DECL_DECLARED_INLINE_P (newdecl)
1879 && !DECL_UNINLINABLE (newdecl))
1880 DECL_INLINE (newdecl) = 1;
1884 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
1886 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1887 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1889 unsigned olddecl_uid = DECL_UID (olddecl);
1890 tree olddecl_context = DECL_CONTEXT (olddecl);
1892 memcpy ((char *) olddecl + sizeof (struct tree_common),
1893 (char *) newdecl + sizeof (struct tree_common),
1894 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1895 switch (TREE_CODE (olddecl))
1905 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1906 (char *) newdecl + sizeof (struct tree_decl_common),
1907 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1912 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1913 (char *) newdecl + sizeof (struct tree_decl_common),
1914 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1916 DECL_UID (olddecl) = olddecl_uid;
1917 DECL_CONTEXT (olddecl) = olddecl_context;
1920 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1921 so that encode_section_info has a chance to look at the new decl
1922 flags and attributes. */
1923 if (DECL_RTL_SET_P (olddecl)
1924 && (TREE_CODE (olddecl) == FUNCTION_DECL
1925 || (TREE_CODE (olddecl) == VAR_DECL
1926 && TREE_STATIC (olddecl))))
1927 make_decl_rtl (olddecl);
1929 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1930 and the definition is coming from the old version, cgraph needs
1931 to be called again. */
1932 if (extern_changed && !new_is_definition
1933 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
1934 cgraph_mark_if_needed (olddecl);
1937 /* Handle when a new declaration NEWDECL has the same name as an old
1938 one OLDDECL in the same binding contour. Prints an error message
1941 If safely possible, alter OLDDECL to look like NEWDECL, and return
1942 true. Otherwise, return false. */
1945 duplicate_decls (tree newdecl, tree olddecl)
1947 tree newtype = NULL, oldtype = NULL;
1949 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1951 /* Avoid `unused variable' and other warnings for OLDDECL. */
1952 TREE_NO_WARNING (olddecl) = 1;
1956 merge_decls (newdecl, olddecl, newtype, oldtype);
1961 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1963 warn_if_shadowing (tree new_decl)
1965 struct c_binding *b;
1967 /* Shadow warnings wanted? */
1969 /* No shadow warnings for internally generated vars. */
1970 || DECL_IS_BUILTIN (new_decl)
1971 /* No shadow warnings for vars made for inlining. */
1972 || DECL_FROM_INLINE (new_decl))
1975 /* Is anything being shadowed? Invisible decls do not count. */
1976 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1977 if (b->decl && b->decl != new_decl && !b->invisible)
1979 tree old_decl = b->decl;
1981 if (old_decl == error_mark_node)
1983 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1984 "non-variable", new_decl);
1987 else if (TREE_CODE (old_decl) == PARM_DECL)
1988 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
1990 else if (DECL_FILE_SCOPE_P (old_decl))
1991 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
1992 "declaration", new_decl);
1993 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1994 && DECL_BUILT_IN (old_decl))
1996 warning (OPT_Wshadow, "declaration of %q+D shadows "
1997 "a built-in function", new_decl);
2001 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
2004 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
2011 /* Subroutine of pushdecl.
2013 X is a TYPE_DECL for a typedef statement. Create a brand new
2014 ..._TYPE node (which will be just a variant of the existing
2015 ..._TYPE node with identical properties) and then install X
2016 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2018 The whole point here is to end up with a situation where each
2019 and every ..._TYPE node the compiler creates will be uniquely
2020 associated with AT MOST one node representing a typedef name.
2021 This way, even though the compiler substitutes corresponding
2022 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2023 early on, later parts of the compiler can always do the reverse
2024 translation and get back the corresponding typedef name. For
2027 typedef struct S MY_TYPE;
2030 Later parts of the compiler might only know that `object' was of
2031 type `struct S' if it were not for code just below. With this
2032 code however, later parts of the compiler see something like:
2034 struct S' == struct S
2035 typedef struct S' MY_TYPE;
2038 And they can then deduce (from the node for type struct S') that
2039 the original object declaration was:
2043 Being able to do this is important for proper support of protoize,
2044 and also for generating precise symbolic debugging information
2045 which takes full account of the programmer's (typedef) vocabulary.
2047 Obviously, we don't want to generate a duplicate ..._TYPE node if
2048 the TYPE_DECL node that we are now processing really represents a
2049 standard built-in type. */
2052 clone_underlying_type (tree x)
2054 if (DECL_IS_BUILTIN (x))
2056 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2057 TYPE_NAME (TREE_TYPE (x)) = x;
2059 else if (TREE_TYPE (x) != error_mark_node
2060 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2062 tree tt = TREE_TYPE (x);
2063 DECL_ORIGINAL_TYPE (x) = tt;
2064 tt = build_variant_type_copy (tt);
2066 TREE_USED (tt) = TREE_USED (x);
2071 /* Record a decl-node X as belonging to the current lexical scope.
2072 Check for errors (such as an incompatible declaration for the same
2073 name already seen in the same scope).
2075 Returns either X or an old decl for the same name.
2076 If an old decl is returned, it may have been smashed
2077 to agree with what X says. */
2082 tree name = DECL_NAME (x);
2083 struct c_scope *scope = current_scope;
2084 struct c_binding *b;
2085 bool nested = false;
2087 /* Must set DECL_CONTEXT for everything not at file scope or
2088 DECL_FILE_SCOPE_P won't work. Local externs don't count
2089 unless they have initializers (which generate code). */
2090 if (current_function_decl
2091 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2092 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2093 DECL_CONTEXT (x) = current_function_decl;
2095 /* If this is of variably modified type, prevent jumping into its
2097 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2098 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2099 c_begin_vm_scope (scope->depth);
2101 /* Anonymous decls are just inserted in the scope. */
2104 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
2108 /* First, see if there is another declaration with the same name in
2109 the current scope. If there is, duplicate_decls may do all the
2110 work for us. If duplicate_decls returns false, that indicates
2111 two incompatible decls in the same scope; we are to silently
2112 replace the old one (duplicate_decls has issued all appropriate
2113 diagnostics). In particular, we should not consider possible
2114 duplicates in the external scope, or shadowing. */
2115 b = I_SYMBOL_BINDING (name);
2116 if (b && B_IN_SCOPE (b, scope))
2118 struct c_binding *b_ext, *b_use;
2119 tree type = TREE_TYPE (x);
2120 tree visdecl = b->decl;
2121 tree vistype = TREE_TYPE (visdecl);
2122 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2123 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2124 b->inner_comp = false;
2127 /* If this is an external linkage declaration, we should check
2128 for compatibility with the type in the external scope before
2129 setting the type at this scope based on the visible
2130 information only. */
2131 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2133 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2134 b_ext = b_ext->shadowed;
2139 TREE_TYPE (b_use->decl) = b_use->type;
2142 if (duplicate_decls (x, b_use->decl))
2146 /* Save the updated type in the external scope and
2147 restore the proper type for this scope. */
2149 if (comptypes (vistype, type))
2150 thistype = composite_type (vistype, type);
2152 thistype = TREE_TYPE (b_use->decl);
2153 b_use->type = TREE_TYPE (b_use->decl);
2154 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2155 && DECL_BUILT_IN (b_use->decl))
2157 = build_type_attribute_variant (thistype,
2160 TREE_TYPE (b_use->decl) = thistype;
2165 goto skip_external_and_shadow_checks;
2168 /* All declarations with external linkage, and all external
2169 references, go in the external scope, no matter what scope is
2170 current. However, the binding in that scope is ignored for
2171 purposes of normal name lookup. A separate binding structure is
2172 created in the requested scope; this governs the normal
2173 visibility of the symbol.
2175 The binding in the externals scope is used exclusively for
2176 detecting duplicate declarations of the same object, no matter
2177 what scope they are in; this is what we do here. (C99 6.2.7p2:
2178 All declarations that refer to the same object or function shall
2179 have compatible type; otherwise, the behavior is undefined.) */
2180 if (DECL_EXTERNAL (x) || scope == file_scope)
2182 tree type = TREE_TYPE (x);
2185 bool type_saved = false;
2186 if (b && !B_IN_EXTERNAL_SCOPE (b)
2187 && (TREE_CODE (b->decl) == FUNCTION_DECL
2188 || TREE_CODE (b->decl) == VAR_DECL)
2189 && DECL_FILE_SCOPE_P (b->decl))
2192 vistype = TREE_TYPE (visdecl);
2194 if (scope != file_scope
2195 && !DECL_IN_SYSTEM_HEADER (x))
2196 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2198 while (b && !B_IN_EXTERNAL_SCOPE (b))
2200 /* If this decl might be modified, save its type. This is
2201 done here rather than when the decl is first bound
2202 because the type may change after first binding, through
2203 being completed or through attributes being added. If we
2204 encounter multiple such decls, only the first should have
2205 its type saved; the others will already have had their
2206 proper types saved and the types will not have changed as
2207 their scopes will not have been re-entered. */
2208 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2210 b->type = TREE_TYPE (b->decl);
2213 if (B_IN_FILE_SCOPE (b)
2214 && TREE_CODE (b->decl) == VAR_DECL
2215 && TREE_STATIC (b->decl)
2216 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2217 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2218 && TREE_CODE (type) == ARRAY_TYPE
2219 && TYPE_DOMAIN (type)
2220 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2221 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2223 /* Array type completed in inner scope, which should be
2224 diagnosed if the completion does not have size 1 and
2225 it does not get completed in the file scope. */
2226 b->inner_comp = true;
2231 /* If a matching external declaration has been found, set its
2232 type to the composite of all the types of that declaration.
2233 After the consistency checks, it will be reset to the
2234 composite of the visible types only. */
2235 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2237 TREE_TYPE (b->decl) = b->type;
2239 /* The point of the same_translation_unit_p check here is,
2240 we want to detect a duplicate decl for a construct like
2241 foo() { extern bar(); } ... static bar(); but not if
2242 they are in different translation units. In any case,
2243 the static does not go in the externals scope. */
2245 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2246 && duplicate_decls (x, b->decl))
2251 if (comptypes (vistype, type))
2252 thistype = composite_type (vistype, type);
2254 thistype = TREE_TYPE (b->decl);
2258 b->type = TREE_TYPE (b->decl);
2259 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2261 = build_type_attribute_variant (thistype,
2262 TYPE_ATTRIBUTES (b->type));
2263 TREE_TYPE (b->decl) = thistype;
2264 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2267 else if (TREE_PUBLIC (x))
2269 if (visdecl && !b && duplicate_decls (x, visdecl))
2271 /* An external declaration at block scope referring to a
2272 visible entity with internal linkage. The composite
2273 type will already be correct for this scope, so we
2274 just need to fall through to make the declaration in
2281 bind (name, x, external_scope, /*invisible=*/true,
2288 if (TREE_CODE (x) != PARM_DECL)
2289 warn_if_shadowing (x);
2291 skip_external_and_shadow_checks:
2292 if (TREE_CODE (x) == TYPE_DECL)
2293 clone_underlying_type (x);
2295 bind (name, x, scope, /*invisible=*/false, nested);
2297 /* If x's type is incomplete because it's based on a
2298 structure or union which has not yet been fully declared,
2299 attach it to that structure or union type, so we can go
2300 back and complete the variable declaration later, if the
2301 structure or union gets fully declared.
2303 If the input is erroneous, we can have error_mark in the type
2304 slot (e.g. "f(void a, ...)") - that doesn't count as an
2306 if (TREE_TYPE (x) != error_mark_node
2307 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2309 tree element = TREE_TYPE (x);
2311 while (TREE_CODE (element) == ARRAY_TYPE)
2312 element = TREE_TYPE (element);
2313 element = TYPE_MAIN_VARIANT (element);
2315 if ((TREE_CODE (element) == RECORD_TYPE
2316 || TREE_CODE (element) == UNION_TYPE)
2317 && (TREE_CODE (x) != TYPE_DECL
2318 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2319 && !COMPLETE_TYPE_P (element))
2320 C_TYPE_INCOMPLETE_VARS (element)
2321 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2326 /* Record X as belonging to file scope.
2327 This is used only internally by the Objective-C front end,
2328 and is limited to its needs. duplicate_decls is not called;
2329 if there is any preexisting decl for this identifier, it is an ICE. */
2332 pushdecl_top_level (tree x)
2335 bool nested = false;
2336 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2338 name = DECL_NAME (x);
2340 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2342 if (TREE_PUBLIC (x))
2344 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2348 bind (name, x, file_scope, /*invisible=*/false, nested);
2354 implicit_decl_warning (tree id, tree olddecl)
2356 if (warn_implicit_function_declaration)
2359 pedwarn (OPT_Wimplicit_function_declaration,
2360 G_("implicit declaration of function %qE"), id);
2362 warning (OPT_Wimplicit_function_declaration,
2363 G_("implicit declaration of function %qE"), id);
2365 locate_old_decl (olddecl, inform);
2369 /* Generate an implicit declaration for identifier FUNCTIONID as a
2370 function of type int (). */
2373 implicitly_declare (tree functionid)
2375 struct c_binding *b;
2379 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2381 if (B_IN_SCOPE (b, external_scope))
2390 if (decl == error_mark_node)
2393 /* FIXME: Objective-C has weird not-really-builtin functions
2394 which are supposed to be visible automatically. They wind up
2395 in the external scope because they're pushed before the file
2396 scope gets created. Catch this here and rebind them into the
2398 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2400 bind (functionid, decl, file_scope,
2401 /*invisible=*/false, /*nested=*/true);
2406 tree newtype = default_function_type;
2408 TREE_TYPE (decl) = b->type;
2409 /* Implicit declaration of a function already declared
2410 (somehow) in a different scope, or as a built-in.
2411 If this is the first time this has happened, warn;
2412 then recycle the old declaration but with the new type. */
2413 if (!C_DECL_IMPLICIT (decl))
2415 implicit_decl_warning (functionid, decl);
2416 C_DECL_IMPLICIT (decl) = 1;
2418 if (DECL_BUILT_IN (decl))
2420 newtype = build_type_attribute_variant (newtype,
2422 (TREE_TYPE (decl)));
2423 if (!comptypes (newtype, TREE_TYPE (decl)))
2425 warning (0, "incompatible implicit declaration of built-in"
2426 " function %qD", decl);
2427 newtype = TREE_TYPE (decl);
2432 if (!comptypes (newtype, TREE_TYPE (decl)))
2434 error ("incompatible implicit declaration of function %qD",
2436 locate_old_decl (decl, error);
2439 b->type = TREE_TYPE (decl);
2440 TREE_TYPE (decl) = newtype;
2441 bind (functionid, decl, current_scope,
2442 /*invisible=*/false, /*nested=*/true);
2447 /* Not seen before. */
2448 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2449 DECL_EXTERNAL (decl) = 1;
2450 TREE_PUBLIC (decl) = 1;
2451 C_DECL_IMPLICIT (decl) = 1;
2452 implicit_decl_warning (functionid, 0);
2453 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2455 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2457 /* C89 says implicit declarations are in the innermost block.
2458 So we record the decl in the standard fashion. */
2459 decl = pushdecl (decl);
2461 /* No need to call objc_check_decl here - it's a function type. */
2462 rest_of_decl_compilation (decl, 0, 0);
2464 /* Write a record describing this implicit function declaration
2465 to the prototypes file (if requested). */
2466 gen_aux_info_record (decl, 0, 1, 0);
2468 /* Possibly apply some default attributes to this implicit declaration. */
2469 decl_attributes (&decl, NULL_TREE, 0);
2474 /* Issue an error message for a reference to an undeclared variable
2475 ID, including a reference to a builtin outside of function-call
2476 context. Establish a binding of the identifier to error_mark_node
2477 in an appropriate scope, which will suppress further errors for the
2478 same identifier. The error message should be given location LOC. */
2480 undeclared_variable (tree id, location_t loc)
2482 static bool already = false;
2483 struct c_scope *scope;
2485 if (current_function_decl == 0)
2487 error ("%H%qE undeclared here (not in a function)", &loc, id);
2488 scope = current_scope;
2492 error ("%H%qE undeclared (first use in this function)", &loc, id);
2496 error ("%H(Each undeclared identifier is reported only once", &loc);
2497 error ("%Hfor each function it appears in.)", &loc);
2501 /* If we are parsing old-style parameter decls, current_function_decl
2502 will be nonnull but current_function_scope will be null. */
2503 scope = current_function_scope ? current_function_scope : current_scope;
2505 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2508 /* Subroutine of lookup_label, declare_label, define_label: construct a
2509 LABEL_DECL with all the proper frills. */
2512 make_label (tree name, location_t location)
2514 tree label = build_decl (LABEL_DECL, name, void_type_node);
2516 DECL_CONTEXT (label) = current_function_decl;
2517 DECL_MODE (label) = VOIDmode;
2518 DECL_SOURCE_LOCATION (label) = location;
2523 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2524 Create one if none exists so far for the current function.
2525 This is called when a label is used in a goto expression or
2526 has its address taken. */
2529 lookup_label (tree name)
2533 if (current_function_decl == 0)
2535 error ("label %qE referenced outside of any function", name);
2539 /* Use a label already defined or ref'd with this name, but not if
2540 it is inherited from a containing function and wasn't declared
2542 label = I_LABEL_DECL (name);
2543 if (label && (DECL_CONTEXT (label) == current_function_decl
2544 || C_DECLARED_LABEL_FLAG (label)))
2546 /* If the label has only been declared, update its apparent
2547 location to point here, for better diagnostics if it
2548 turns out not to have been defined. */
2549 if (!TREE_USED (label))
2550 DECL_SOURCE_LOCATION (label) = input_location;
2554 /* No label binding for that identifier; make one. */
2555 label = make_label (name, input_location);
2557 /* Ordinary labels go in the current function scope. */
2558 bind (name, label, current_function_scope,
2559 /*invisible=*/false, /*nested=*/false);
2563 /* Make a label named NAME in the current function, shadowing silently
2564 any that may be inherited from containing functions or containing
2565 scopes. This is called for __label__ declarations. */
2568 declare_label (tree name)
2570 struct c_binding *b = I_LABEL_BINDING (name);
2573 /* Check to make sure that the label hasn't already been declared
2575 if (b && B_IN_CURRENT_SCOPE (b))
2577 error ("duplicate label declaration %qE", name);
2578 locate_old_decl (b->decl, error);
2580 /* Just use the previous declaration. */
2584 label = make_label (name, input_location);
2585 C_DECLARED_LABEL_FLAG (label) = 1;
2587 /* Declared labels go in the current scope. */
2588 bind (name, label, current_scope,
2589 /*invisible=*/false, /*nested=*/false);
2593 /* Define a label, specifying the location in the source file.
2594 Return the LABEL_DECL node for the label, if the definition is valid.
2595 Otherwise return 0. */
2598 define_label (location_t location, tree name)
2600 /* Find any preexisting label with this name. It is an error
2601 if that label has already been defined in this function, or
2602 if there is a containing function with a declared label with
2604 tree label = I_LABEL_DECL (name);
2605 struct c_label_list *nlist_se, *nlist_vm;
2608 && ((DECL_CONTEXT (label) == current_function_decl
2609 && DECL_INITIAL (label) != 0)
2610 || (DECL_CONTEXT (label) != current_function_decl
2611 && C_DECLARED_LABEL_FLAG (label))))
2613 error ("%Hduplicate label %qD", &location, label);
2614 locate_old_decl (label, error);
2617 else if (label && DECL_CONTEXT (label) == current_function_decl)
2619 /* The label has been used or declared already in this function,
2620 but not defined. Update its location to point to this
2622 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2623 error ("%Jjump into statement expression", label);
2624 if (C_DECL_UNDEFINABLE_VM (label))
2625 error ("%Jjump into scope of identifier with variably modified type",
2627 DECL_SOURCE_LOCATION (label) = location;
2631 /* No label binding for that identifier; make one. */
2632 label = make_label (name, location);
2634 /* Ordinary labels go in the current function scope. */
2635 bind (name, label, current_function_scope,
2636 /*invisible=*/false, /*nested=*/false);
2639 if (!in_system_header && lookup_name (name))
2640 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2641 "for labels, identifier %qE conflicts", &location, name);
2643 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2644 nlist_se->next = label_context_stack_se->labels_def;
2645 nlist_se->label = label;
2646 label_context_stack_se->labels_def = nlist_se;
2648 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2649 nlist_vm->next = label_context_stack_vm->labels_def;
2650 nlist_vm->label = label;
2651 label_context_stack_vm->labels_def = nlist_vm;
2653 /* Mark label as having been defined. */
2654 DECL_INITIAL (label) = error_mark_node;
2658 /* Given NAME, an IDENTIFIER_NODE,
2659 return the structure (or union or enum) definition for that name.
2660 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2661 CODE says which kind of type the caller wants;
2662 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2663 If the wrong kind of type is found, an error is reported. */
2666 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2668 struct c_binding *b = I_TAG_BINDING (name);
2674 /* We only care about whether it's in this level if
2675 thislevel_only was set or it might be a type clash. */
2676 if (thislevel_only || TREE_CODE (b->decl) != code)
2678 /* For our purposes, a tag in the external scope is the same as
2679 a tag in the file scope. (Primarily relevant to Objective-C
2680 and its builtin structure tags, which get pushed before the
2681 file scope is created.) */
2682 if (B_IN_CURRENT_SCOPE (b)
2683 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2687 if (thislevel_only && !thislevel)
2690 if (TREE_CODE (b->decl) != code)
2692 /* Definition isn't the kind we were looking for. */
2693 pending_invalid_xref = name;
2694 pending_invalid_xref_location = input_location;
2696 /* If in the same binding level as a declaration as a tag
2697 of a different type, this must not be allowed to
2698 shadow that tag, so give the error immediately.
2699 (For example, "struct foo; union foo;" is invalid.) */
2701 pending_xref_error ();
2706 /* Print an error message now
2707 for a recent invalid struct, union or enum cross reference.
2708 We don't print them immediately because they are not invalid
2709 when used in the `struct foo;' construct for shadowing. */
2712 pending_xref_error (void)
2714 if (pending_invalid_xref != 0)
2715 error ("%H%qE defined as wrong kind of tag",
2716 &pending_invalid_xref_location, pending_invalid_xref);
2717 pending_invalid_xref = 0;
2721 /* Look up NAME in the current scope and its superiors
2722 in the namespace of variables, functions and typedefs.
2723 Return a ..._DECL node of some kind representing its definition,
2724 or return 0 if it is undefined. */
2727 lookup_name (tree name)
2729 struct c_binding *b = I_SYMBOL_BINDING (name);
2730 if (b && !b->invisible)
2735 /* Similar to `lookup_name' but look only at the indicated scope. */
2738 lookup_name_in_scope (tree name, struct c_scope *scope)
2740 struct c_binding *b;
2742 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2743 if (B_IN_SCOPE (b, scope))
2748 /* Create the predefined scalar types of C,
2749 and some nodes representing standard constants (0, 1, (void *) 0).
2750 Initialize the global scope.
2751 Make definitions for built-in primitive functions. */
2754 c_init_decl_processing (void)
2756 location_t save_loc = input_location;
2758 /* Initialize reserved words for parser. */
2761 current_function_decl = 0;
2763 gcc_obstack_init (&parser_obstack);
2765 /* Make the externals scope. */
2767 external_scope = current_scope;
2769 /* Declarations from c_common_nodes_and_builtins must not be associated
2770 with this input file, lest we get differences between using and not
2771 using preprocessed headers. */
2772 input_location = BUILTINS_LOCATION;
2774 build_common_tree_nodes (flag_signed_char, false);
2776 c_common_nodes_and_builtins ();
2778 /* In C, comparisons and TRUTH_* expressions have type int. */
2779 truthvalue_type_node = integer_type_node;
2780 truthvalue_true_node = integer_one_node;
2781 truthvalue_false_node = integer_zero_node;
2783 /* Even in C99, which has a real boolean type. */
2784 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2785 boolean_type_node));
2787 input_location = save_loc;
2789 pedantic_lvalues = true;
2791 make_fname_decl = c_make_fname_decl;
2792 start_fname_decls ();
2795 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2796 decl, NAME is the initialization string and TYPE_DEP indicates whether
2797 NAME depended on the type of the function. As we don't yet implement
2798 delayed emission of static data, we mark the decl as emitted
2799 so it is not placed in the output. Anything using it must therefore pull
2800 out the STRING_CST initializer directly. FIXME. */
2803 c_make_fname_decl (tree id, int type_dep)
2805 const char *name = fname_as_string (type_dep);
2806 tree decl, type, init;
2807 size_t length = strlen (name);
2809 type = build_array_type (char_type_node,
2810 build_index_type (size_int (length)));
2811 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2813 decl = build_decl (VAR_DECL, id, type);
2815 TREE_STATIC (decl) = 1;
2816 TREE_READONLY (decl) = 1;
2817 DECL_ARTIFICIAL (decl) = 1;
2819 init = build_string (length + 1, name);
2820 free (CONST_CAST (char *, name));
2821 TREE_TYPE (init) = type;
2822 DECL_INITIAL (decl) = init;
2824 TREE_USED (decl) = 1;
2826 if (current_function_decl
2827 /* For invalid programs like this:
2830 const char* p = __FUNCTION__;
2832 the __FUNCTION__ is believed to appear in K&R style function
2833 parameter declarator. In that case we still don't have
2835 && (!errorcount || current_function_scope))
2837 DECL_CONTEXT (decl) = current_function_decl;
2838 bind (id, decl, current_function_scope,
2839 /*invisible=*/false, /*nested=*/false);
2842 finish_decl (decl, init, NULL_TREE);
2848 c_builtin_function (tree decl)
2850 tree type = TREE_TYPE (decl);
2851 tree id = DECL_NAME (decl);
2853 const char *name = IDENTIFIER_POINTER (id);
2854 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2856 /* Should never be called on a symbol with a preexisting meaning. */
2857 gcc_assert (!I_SYMBOL_BINDING (id));
2859 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2861 /* Builtins in the implementation namespace are made visible without
2862 needing to be explicitly declared. See push_file_scope. */
2863 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2865 TREE_CHAIN (decl) = visible_builtins;
2866 visible_builtins = decl;
2872 /* Called when a declaration is seen that contains no names to declare.
2873 If its type is a reference to a structure, union or enum inherited
2874 from a containing scope, shadow that tag name for the current scope
2875 with a forward reference.
2876 If its type defines a new named structure or union
2877 or defines an enum, it is valid but we need not do anything here.
2878 Otherwise, it is an error. */
2881 shadow_tag (const struct c_declspecs *declspecs)
2883 shadow_tag_warned (declspecs, 0);
2886 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2889 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2891 bool found_tag = false;
2893 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2895 tree value = declspecs->type;
2896 enum tree_code code = TREE_CODE (value);
2898 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2899 /* Used to test also that TYPE_SIZE (value) != 0.
2900 That caused warning for `struct foo;' at top level in the file. */
2902 tree name = TYPE_NAME (value);
2909 if (warned != 1 && code != ENUMERAL_TYPE)
2910 /* Empty unnamed enum OK */
2912 pedwarn (0, "unnamed struct/union that defines no instances");
2916 else if (!declspecs->tag_defined_p
2917 && declspecs->storage_class != csc_none)
2920 pedwarn (0, "empty declaration with storage class specifier "
2921 "does not redeclare tag");
2923 pending_xref_error ();
2925 else if (!declspecs->tag_defined_p
2926 && (declspecs->const_p
2927 || declspecs->volatile_p
2928 || declspecs->restrict_p))
2931 pedwarn (0, "empty declaration with type qualifier "
2932 "does not redeclare tag");
2934 pending_xref_error ();
2938 pending_invalid_xref = 0;
2939 t = lookup_tag (code, name, 1);
2943 t = make_node (code);
2950 if (warned != 1 && !in_system_header)
2952 pedwarn (0, "useless type name in empty declaration");
2957 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2959 pedwarn (0, "useless type name in empty declaration");
2963 pending_invalid_xref = 0;
2965 if (declspecs->inline_p)
2967 error ("%<inline%> in empty declaration");
2971 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2973 error ("%<auto%> in file-scope empty declaration");
2977 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2979 error ("%<register%> in file-scope empty declaration");
2983 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2985 warning (0, "useless storage class specifier in empty declaration");
2989 if (!warned && !in_system_header && declspecs->thread_p)
2991 warning (0, "useless %<__thread%> in empty declaration");
2995 if (!warned && !in_system_header && (declspecs->const_p
2996 || declspecs->volatile_p
2997 || declspecs->restrict_p))
2999 warning (0, "useless type qualifier in empty declaration");
3006 pedwarn (0, "empty declaration");
3011 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3012 bits. SPECS represents declaration specifiers that the grammar
3013 only permits to contain type qualifiers and attributes. */
3016 quals_from_declspecs (const struct c_declspecs *specs)
3018 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3019 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3020 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
3021 gcc_assert (!specs->type
3022 && !specs->decl_attr
3023 && specs->typespec_word == cts_none
3024 && specs->storage_class == csc_none
3025 && !specs->typedef_p
3026 && !specs->explicit_signed_p
3027 && !specs->deprecated_p
3029 && !specs->long_long_p
3032 && !specs->unsigned_p
3033 && !specs->complex_p
3035 && !specs->thread_p);
3039 /* Construct an array declarator. EXPR is the expression inside [],
3040 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3041 applied to the pointer to which a parameter array is converted).
3042 STATIC_P is true if "static" is inside the [], false otherwise.
3043 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3044 length which is nevertheless a complete type, false otherwise. The
3045 field for the contained declarator is left to be filled in by
3046 set_array_declarator_inner. */
3048 struct c_declarator *
3049 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3052 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3053 struct c_declarator);
3054 declarator->kind = cdk_array;
3055 declarator->declarator = 0;
3056 declarator->u.array.dimen = expr;
3059 declarator->u.array.attrs = quals->attrs;
3060 declarator->u.array.quals = quals_from_declspecs (quals);
3064 declarator->u.array.attrs = NULL_TREE;
3065 declarator->u.array.quals = 0;
3067 declarator->u.array.static_p = static_p;
3068 declarator->u.array.vla_unspec_p = vla_unspec_p;
3071 if (static_p || quals != NULL)
3072 pedwarn (OPT_pedantic, "ISO C90 does not support %<static%> or type "
3073 "qualifiers in parameter array declarators");
3075 pedwarn (OPT_pedantic, "ISO C90 does not support %<[*]%> array declarators");
3079 if (!current_scope->parm_flag)
3082 error ("%<[*]%> not allowed in other than function prototype scope");
3083 declarator->u.array.vla_unspec_p = false;
3086 current_scope->had_vla_unspec = true;
3091 /* Set the contained declarator of an array declarator. DECL is the
3092 declarator, as constructed by build_array_declarator; INNER is what
3093 appears on the left of the []. */
3095 struct c_declarator *
3096 set_array_declarator_inner (struct c_declarator *decl,
3097 struct c_declarator *inner)
3099 decl->declarator = inner;
3103 /* INIT is a constructor that forms DECL's initializer. If the final
3104 element initializes a flexible array field, add the size of that
3105 initializer to DECL's size. */
3108 add_flexible_array_elts_to_size (tree decl, tree init)
3112 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3115 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3116 type = TREE_TYPE (elt);
3117 if (TREE_CODE (type) == ARRAY_TYPE
3118 && TYPE_SIZE (type) == NULL_TREE
3119 && TYPE_DOMAIN (type) != NULL_TREE
3120 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3122 complete_array_type (&type, elt, false);
3124 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3125 DECL_SIZE_UNIT (decl)
3126 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3130 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3133 groktypename (struct c_type_name *type_name)
3136 tree attrs = type_name->specs->attrs;
3138 type_name->specs->attrs = NULL_TREE;
3140 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3141 false, NULL, &attrs, DEPRECATED_NORMAL);
3143 /* Apply attributes. */
3144 decl_attributes (&type, attrs, 0);
3149 /* Decode a declarator in an ordinary declaration or data definition.
3150 This is called as soon as the type information and variable name
3151 have been parsed, before parsing the initializer if any.
3152 Here we create the ..._DECL node, fill in its type,
3153 and put it on the list of decls for the current context.
3154 The ..._DECL node is returned as the value.
3156 Exception: for arrays where the length is not specified,
3157 the type is left null, to be filled in by `finish_decl'.
3159 Function definitions do not come here; they go to start_function
3160 instead. However, external and forward declarations of functions
3161 do go through here. Structure field declarations are done by
3162 grokfield and not through here. */
3165 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3166 bool initialized, tree attributes)
3170 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
3172 /* An object declared as __attribute__((deprecated)) suppresses
3173 warnings of uses of other deprecated items. */
3174 if (lookup_attribute ("deprecated", attributes))
3175 deprecated_state = DEPRECATED_SUPPRESS;
3177 decl = grokdeclarator (declarator, declspecs,
3178 NORMAL, initialized, NULL, &attributes,
3183 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3184 && MAIN_NAME_P (DECL_NAME (decl)))
3185 warning (OPT_Wmain, "%q+D is usually a function", decl);
3188 /* Is it valid for this decl to have an initializer at all?
3189 If not, set INITIALIZED to zero, which will indirectly
3190 tell 'finish_decl' to ignore the initializer once it is parsed. */
3191 switch (TREE_CODE (decl))
3194 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3199 error ("function %qD is initialized like a variable", decl);
3204 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3205 error ("parameter %qD is initialized", decl);
3210 /* Don't allow initializations for incomplete types except for
3211 arrays which might be completed by the initialization. */
3213 /* This can happen if the array size is an undefined macro.
3214 We already gave a warning, so we don't need another one. */
3215 if (TREE_TYPE (decl) == error_mark_node)
3217 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3219 /* A complete type is ok if size is fixed. */
3221 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3222 || C_DECL_VARIABLE_SIZE (decl))
3224 error ("variable-sized object may not be initialized");
3228 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3230 error ("variable %qD has initializer but incomplete type", decl);
3233 else if (C_DECL_VARIABLE_SIZE (decl))
3235 /* Although C99 is unclear about whether incomplete arrays
3236 of VLAs themselves count as VLAs, it does not make
3237 sense to permit them to be initialized given that
3238 ordinary VLAs may not be initialized. */
3239 error ("variable-sized object may not be initialized");
3246 if (current_scope == file_scope)
3247 TREE_STATIC (decl) = 1;
3249 /* Tell 'pushdecl' this is an initialized decl
3250 even though we don't yet have the initializer expression.
3251 Also tell 'finish_decl' it may store the real initializer. */
3252 DECL_INITIAL (decl) = error_mark_node;
3255 /* If this is a function declaration, write a record describing it to the
3256 prototypes file (if requested). */
3258 if (TREE_CODE (decl) == FUNCTION_DECL)
3259 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3261 /* ANSI specifies that a tentative definition which is not merged with
3262 a non-tentative definition behaves exactly like a definition with an
3263 initializer equal to zero. (Section 3.7.2)
3265 -fno-common gives strict ANSI behavior, though this tends to break
3266 a large body of code that grew up without this rule.
3268 Thread-local variables are never common, since there's no entrenched
3269 body of code to break, and it allows more efficient variable references
3270 in the presence of dynamic linking. */
3272 if (TREE_CODE (decl) == VAR_DECL
3274 && TREE_PUBLIC (decl)
3275 && !DECL_THREAD_LOCAL_P (decl)
3277 DECL_COMMON (decl) = 1;
3279 /* Set attributes here so if duplicate decl, will have proper attributes. */
3280 decl_attributes (&decl, attributes, 0);
3282 /* Handle gnu_inline attribute. */
3283 if (declspecs->inline_p
3284 && !flag_gnu89_inline
3285 && TREE_CODE (decl) == FUNCTION_DECL
3286 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
3287 || current_function_decl))
3289 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
3291 else if (declspecs->storage_class != csc_static)
3292 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
3295 if (TREE_CODE (decl) == FUNCTION_DECL
3296 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3298 struct c_declarator *ce = declarator;
3300 if (ce->kind == cdk_pointer)
3301 ce = declarator->declarator;
3302 if (ce->kind == cdk_function)
3304 tree args = ce->u.arg_info->parms;
3305 for (; args; args = TREE_CHAIN (args))
3307 tree type = TREE_TYPE (args);
3308 if (type && INTEGRAL_TYPE_P (type)
3309 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3310 DECL_ARG_TYPE (args) = integer_type_node;
3315 if (TREE_CODE (decl) == FUNCTION_DECL
3316 && DECL_DECLARED_INLINE_P (decl)
3317 && DECL_UNINLINABLE (decl)
3318 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3319 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3322 /* C99 6.7.4p3: An inline definition of a function with external
3323 linkage shall not contain a definition of a modifiable object
3324 with static storage duration... */
3325 if (TREE_CODE (decl) == VAR_DECL
3326 && current_scope != file_scope
3327 && TREE_STATIC (decl)
3328 && !TREE_READONLY (decl)
3329 && DECL_DECLARED_INLINE_P (current_function_decl)
3330 && DECL_EXTERNAL (current_function_decl))
3331 pedwarn (0, "%q+D is static but declared in inline function %qD "
3332 "which is not static", decl, current_function_decl);
3334 /* Add this decl to the current scope.
3335 TEM may equal DECL or it may be a previous decl of the same name. */
3336 tem = pushdecl (decl);
3338 if (initialized && DECL_EXTERNAL (tem))
3340 DECL_EXTERNAL (tem) = 0;
3341 TREE_STATIC (tem) = 1;
3347 /* Initialize EH if not initialized yet and exceptions are enabled. */
3350 c_maybe_initialize_eh (void)
3352 if (!flag_exceptions || c_eh_initialized_p)
3355 c_eh_initialized_p = true;
3356 eh_personality_libfunc
3357 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3358 ? "__gcc_personality_sj0"
3359 : "__gcc_personality_v0");
3360 default_init_unwind_resume_libfunc ();
3361 using_eh_for_cleanups ();
3364 /* Finish processing of a declaration;
3365 install its initial value.
3366 If the length of an array type is not known before,
3367 it must be determined now, from the initial value, or it is an error. */
3370 finish_decl (tree decl, tree init, tree asmspec_tree)
3373 int was_incomplete = (DECL_SIZE (decl) == 0);
3374 const char *asmspec = 0;
3376 /* If a name was specified, get the string. */
3377 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3378 && DECL_FILE_SCOPE_P (decl))
3379 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3381 asmspec = TREE_STRING_POINTER (asmspec_tree);
3383 /* If `start_decl' didn't like having an initialization, ignore it now. */
3384 if (init != 0 && DECL_INITIAL (decl) == 0)
3387 /* Don't crash if parm is initialized. */
3388 if (TREE_CODE (decl) == PARM_DECL)
3392 store_init_value (decl, init);
3394 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3395 || TREE_CODE (decl) == FUNCTION_DECL
3396 || TREE_CODE (decl) == FIELD_DECL))
3397 objc_check_decl (decl);
3399 type = TREE_TYPE (decl);
3401 /* Deduce size of array from initialization, if not already known. */
3402 if (TREE_CODE (type) == ARRAY_TYPE
3403 && TYPE_DOMAIN (type) == 0
3404 && TREE_CODE (decl) != TYPE_DECL)
3407 = (TREE_STATIC (decl)
3408 /* Even if pedantic, an external linkage array
3409 may have incomplete type at first. */
3410 ? pedantic && !TREE_PUBLIC (decl)
3411 : !DECL_EXTERNAL (decl));
3413 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3416 /* Get the completed type made by complete_array_type. */
3417 type = TREE_TYPE (decl);
3422 error ("initializer fails to determine size of %q+D", decl);
3427 error ("array size missing in %q+D", decl);
3428 /* If a `static' var's size isn't known,
3429 make it extern as well as static, so it does not get
3431 If it is not `static', then do not mark extern;
3432 finish_incomplete_decl will give it a default size
3433 and it will get allocated. */
3434 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3435 DECL_EXTERNAL (decl) = 1;
3439 error ("zero or negative size array %q+D", decl);
3443 /* For global variables, update the copy of the type that
3444 exists in the binding. */
3445 if (TREE_PUBLIC (decl))
3447 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3448 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3449 b_ext = b_ext->shadowed;
3453 b_ext->type = composite_type (b_ext->type, type);
3464 if (DECL_INITIAL (decl))
3465 TREE_TYPE (DECL_INITIAL (decl)) = type;
3467 layout_decl (decl, 0);
3470 if (TREE_CODE (decl) == VAR_DECL)
3472 if (init && TREE_CODE (init) == CONSTRUCTOR)
3473 add_flexible_array_elts_to_size (decl, init);
3475 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3476 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3477 layout_decl (decl, 0);
3479 if (DECL_SIZE (decl) == 0
3480 /* Don't give an error if we already gave one earlier. */
3481 && TREE_TYPE (decl) != error_mark_node
3482 && (TREE_STATIC (decl)
3483 /* A static variable with an incomplete type
3484 is an error if it is initialized.
3485 Also if it is not file scope.
3486 Otherwise, let it through, but if it is not `extern'
3487 then it may cause an error message later. */
3488 ? (DECL_INITIAL (decl) != 0
3489 || !DECL_FILE_SCOPE_P (decl))
3490 /* An automatic variable with an incomplete type
3492 : !DECL_EXTERNAL (decl)))
3494 error ("storage size of %q+D isn%'t known", decl);
3495 TREE_TYPE (decl) = error_mark_node;
3498 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3499 && DECL_SIZE (decl) != 0)
3501 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3502 constant_expression_warning (DECL_SIZE (decl));
3505 error ("storage size of %q+D isn%'t constant", decl);
3506 TREE_TYPE (decl) = error_mark_node;
3510 if (TREE_USED (type))
3511 TREE_USED (decl) = 1;
3514 /* If this is a function and an assembler name is specified, reset DECL_RTL
3515 so we can give it its new name. Also, update built_in_decls if it
3516 was a normal built-in. */
3517 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3519 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3520 set_builtin_user_assembler_name (decl, asmspec);
3521 set_user_assembler_name (decl, asmspec);
3524 /* If #pragma weak was used, mark the decl weak now. */
3525 maybe_apply_pragma_weak (decl);
3527 /* Output the assembler code and/or RTL code for variables and functions,
3528 unless the type is an undefined structure or union.
3529 If not, it will get done when the type is completed. */
3531 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3533 /* Determine the ELF visibility. */
3534 if (TREE_PUBLIC (decl))
3535 c_determine_visibility (decl);
3537 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3538 if (c_dialect_objc ())
3539 objc_check_decl (decl);
3543 /* If this is not a static variable, issue a warning.
3544 It doesn't make any sense to give an ASMSPEC for an
3545 ordinary, non-register local variable. Historically,
3546 GCC has accepted -- but ignored -- the ASMSPEC in
3548 if (!DECL_FILE_SCOPE_P (decl)
3549 && TREE_CODE (decl) == VAR_DECL
3550 && !C_DECL_REGISTER (decl)
3551 && !TREE_STATIC (decl))
3552 warning (0, "ignoring asm-specifier for non-static local "
3553 "variable %q+D", decl);
3555 set_user_assembler_name (decl, asmspec);
3558 if (DECL_FILE_SCOPE_P (decl))
3560 if (DECL_INITIAL (decl) == NULL_TREE
3561 || DECL_INITIAL (decl) == error_mark_node)
3562 /* Don't output anything
3563 when a tentative file-scope definition is seen.
3564 But at end of compilation, do output code for them. */
3565 DECL_DEFER_OUTPUT (decl) = 1;
3566 rest_of_decl_compilation (decl, true, 0);
3570 /* In conjunction with an ASMSPEC, the `register'
3571 keyword indicates that we should place the variable
3572 in a particular register. */
3573 if (asmspec && C_DECL_REGISTER (decl))
3575 DECL_HARD_REGISTER (decl) = 1;
3576 /* This cannot be done for a structure with volatile
3577 fields, on which DECL_REGISTER will have been
3579 if (!DECL_REGISTER (decl))
3580 error ("cannot put object with volatile field into register");
3583 if (TREE_CODE (decl) != FUNCTION_DECL)
3585 /* If we're building a variable sized type, and we might be
3586 reachable other than via the top of the current binding
3587 level, then create a new BIND_EXPR so that we deallocate
3588 the object at the right time. */
3589 /* Note that DECL_SIZE can be null due to errors. */
3590 if (DECL_SIZE (decl)
3591 && !TREE_CONSTANT (DECL_SIZE (decl))
3592 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3595 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3596 TREE_SIDE_EFFECTS (bind) = 1;
3598 BIND_EXPR_BODY (bind) = push_stmt_list ();
3600 add_stmt (build_stmt (DECL_EXPR, decl));
3605 if (!DECL_FILE_SCOPE_P (decl))
3607 /* Recompute the RTL of a local array now
3608 if it used to be an incomplete type. */
3610 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3612 /* If we used it already as memory, it must stay in memory. */
3613 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3614 /* If it's still incomplete now, no init will save it. */
3615 if (DECL_SIZE (decl) == 0)
3616 DECL_INITIAL (decl) = 0;
3621 /* If this was marked 'used', be sure it will be output. */
3622 if (!flag_unit_at_a_time && lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3623 mark_decl_referenced (decl);
3625 if (TREE_CODE (decl) == TYPE_DECL)
3627 if (!DECL_FILE_SCOPE_P (decl)
3628 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3629 add_stmt (build_stmt (DECL_EXPR, decl));
3631 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3634 /* At the end of a declaration, throw away any variable type sizes
3635 of types defined inside that declaration. There is no use
3636 computing them in the following function definition. */
3637 if (current_scope == file_scope)
3638 get_pending_sizes ();
3640 /* Install a cleanup (aka destructor) if one was given. */
3641 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3643 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3646 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3647 tree cleanup_decl = lookup_name (cleanup_id);
3650 /* Build "cleanup(&decl)" for the destructor. */
3651 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3652 cleanup = build_tree_list (NULL_TREE, cleanup);
3653 cleanup = build_function_call (cleanup_decl, cleanup);
3655 /* Don't warn about decl unused; the cleanup uses it. */
3656 TREE_USED (decl) = 1;
3657 TREE_USED (cleanup_decl) = 1;
3659 /* Initialize EH, if we've been told to do so. */
3660 c_maybe_initialize_eh ();
3662 push_cleanup (decl, cleanup, false);
3667 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3670 grokparm (const struct c_parm *parm)
3672 tree attrs = parm->attrs;
3673 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3674 NULL, &attrs, DEPRECATED_NORMAL);
3676 decl_attributes (&decl, attrs, 0);
3681 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3682 and push that on the current scope. */
3685 push_parm_decl (const struct c_parm *parm)
3687 tree attrs = parm->attrs;
3690 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
3691 &attrs, DEPRECATED_NORMAL);
3692 decl_attributes (&decl, attrs, 0);
3694 decl = pushdecl (decl);
3696 finish_decl (decl, NULL_TREE, NULL_TREE);
3699 /* Mark all the parameter declarations to date as forward decls.
3700 Also diagnose use of this extension. */
3703 mark_forward_parm_decls (void)
3705 struct c_binding *b;
3707 if (pedantic && !current_scope->warned_forward_parm_decls)
3709 pedwarn (OPT_pedantic, "ISO C forbids forward parameter declarations");
3710 current_scope->warned_forward_parm_decls = true;
3713 for (b = current_scope->bindings; b; b = b->prev)
3714 if (TREE_CODE (b->decl) == PARM_DECL)
3715 TREE_ASM_WRITTEN (b->decl) = 1;
3718 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3719 literal, which may be an incomplete array type completed by the
3720 initializer; INIT is a CONSTRUCTOR that initializes the compound
3724 build_compound_literal (tree type, tree init)
3726 /* We do not use start_decl here because we have a type, not a declarator;
3727 and do not use finish_decl because the decl should be stored inside
3728 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3733 if (type == error_mark_node)
3734 return error_mark_node;
3736 decl = build_decl (VAR_DECL, NULL_TREE, type);
3737 DECL_EXTERNAL (decl) = 0;
3738 TREE_PUBLIC (decl) = 0;
3739 TREE_STATIC (decl) = (current_scope == file_scope);
3740 DECL_CONTEXT (decl) = current_function_decl;
3741 TREE_USED (decl) = 1;
3742 TREE_TYPE (decl) = type;
3743 TREE_READONLY (decl) = TYPE_READONLY (type);
3744 store_init_value (decl, init);
3746 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3748 int failure = complete_array_type (&TREE_TYPE (decl),
3749 DECL_INITIAL (decl), true);
3750 gcc_assert (!failure);
3752 type = TREE_TYPE (decl);
3753 TREE_TYPE (DECL_INITIAL (decl)) = type;
3756 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3757 return error_mark_node;
3759 stmt = build_stmt (DECL_EXPR, decl);
3760 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3761 TREE_SIDE_EFFECTS (complit) = 1;
3763 layout_decl (decl, 0);
3765 if (TREE_STATIC (decl))
3767 /* This decl needs a name for the assembler output. */
3768 set_compound_literal_name (decl);
3769 DECL_DEFER_OUTPUT (decl) = 1;
3770 DECL_COMDAT (decl) = 1;
3771 DECL_ARTIFICIAL (decl) = 1;
3772 DECL_IGNORED_P (decl) = 1;
3774 rest_of_decl_compilation (decl, 1, 0);
3780 /* Determine whether TYPE is a structure with a flexible array member,
3781 or a union containing such a structure (possibly recursively). */
3784 flexible_array_type_p (tree type)
3787 switch (TREE_CODE (type))
3790 x = TYPE_FIELDS (type);
3793 while (TREE_CHAIN (x) != NULL_TREE)
3795 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3796 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3797 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3798 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3802 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3804 if (flexible_array_type_p (TREE_TYPE (x)))
3813 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3814 replacing with appropriate values if they are invalid. */
3816 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3819 unsigned int max_width;
3820 unsigned HOST_WIDE_INT w;
3821 const char *name = orig_name ? orig_name: _("<anonymous>");
3823 /* Detect and ignore out of range field width and process valid
3825 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3826 || TREE_CODE (*width) != INTEGER_CST)
3828 error ("bit-field %qs width not an integer constant", name);
3829 *width = integer_one_node;
3833 constant_expression_warning (*width);
3834 if (tree_int_cst_sgn (*width) < 0)
3836 error ("negative width in bit-field %qs", name);
3837 *width = integer_one_node;
3839 else if (integer_zerop (*width) && orig_name)
3841 error ("zero width for bit-field %qs", name);
3842 *width = integer_one_node;
3846 /* Detect invalid bit-field type. */
3847 if (TREE_CODE (*type) != INTEGER_TYPE
3848 && TREE_CODE (*type) != BOOLEAN_TYPE
3849 && TREE_CODE (*type) != ENUMERAL_TYPE)
3851 error ("bit-field %qs has invalid type", name);
3852 *type = unsigned_type_node;
3855 type_mv = TYPE_MAIN_VARIANT (*type);
3856 if (!in_system_header
3857 && type_mv != integer_type_node
3858 && type_mv != unsigned_type_node
3859 && type_mv != boolean_type_node)
3860 pedwarn (OPT_pedantic, "type of bit-field %qs is a GCC extension", name);
3862 max_width = TYPE_PRECISION (*type);
3864 if (0 < compare_tree_int (*width, max_width))
3866 error ("width of %qs exceeds its type", name);
3868 *width = build_int_cst (NULL_TREE, w);
3871 w = tree_low_cst (*width, 1);
3873 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3875 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3877 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3878 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3879 warning (0, "%qs is narrower than values of its type", name);
3885 /* Print warning about variable length array if necessary. */
3888 warn_variable_length_array (const char *name, tree size)
3890 int const_size = TREE_CONSTANT (size);
3892 if (!flag_isoc99 && pedantic && warn_vla != 0)
3897 pedwarn (OPT_Wvla, "ISO C90 forbids array %qs whose size "
3898 "can%'t be evaluated",
3901 pedwarn (OPT_Wvla, "ISO C90 forbids array whose size "
3902 "can%'t be evaluated");
3907 pedwarn (OPT_Wvla, "ISO C90 forbids variable length array %qs",
3910 pedwarn (OPT_Wvla, "ISO C90 forbids variable length array");
3913 else if (warn_vla > 0)
3919 "the size of array %qs can"
3920 "%'t be evaluated", name);
3923 "the size of array can %'t be evaluated");
3929 "variable length array %qs is used",
3933 "variable length array is used");
3938 /* Given declspecs and a declarator,
3939 determine the name and type of the object declared
3940 and construct a ..._DECL node for it.
3941 (In one case we can return a ..._TYPE node instead.
3942 For invalid input we sometimes return 0.)
3944 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3946 DECL_CONTEXT says which syntactic context this declaration is in:
3947 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3948 FUNCDEF for a function definition. Like NORMAL but a few different
3949 error messages in each case. Return value may be zero meaning
3950 this definition is too screwy to try to parse.
3951 PARM for a parameter declaration (either within a function prototype
3952 or before a function body). Make a PARM_DECL, or return void_type_node.
3953 TYPENAME if for a typename (in a cast or sizeof).
3954 Don't make a DECL node; just return the ..._TYPE node.
3955 FIELD for a struct or union field; make a FIELD_DECL.
3956 INITIALIZED is true if the decl has an initializer.
3957 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3958 representing the width of the bit-field.
3959 DECL_ATTRS points to the list of attributes that should be added to this
3960 decl. Any nested attributes that belong on the decl itself will be
3962 DEPRECATED_STATE is a deprecated_states value indicating whether
3963 deprecation warnings should be suppressed.
3965 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3966 It may also be so in the PARM case, for a prototype where the
3967 argument type is specified but not the name.
3969 This function is where the complicated C meanings of `static'
3970 and `extern' are interpreted. */
3973 grokdeclarator (const struct c_declarator *declarator,
3974 struct c_declspecs *declspecs,
3975 enum decl_context decl_context, bool initialized, tree *width,
3976 tree *decl_attrs, enum deprecated_states deprecated_state)
3978 tree type = declspecs->type;
3979 bool threadp = declspecs->thread_p;
3980 enum c_storage_class storage_class = declspecs->storage_class;
3984 int type_quals = TYPE_UNQUALIFIED;
3985 const char *name, *orig_name;
3986 bool funcdef_flag = false;
3987 bool funcdef_syntax = false;
3988 int size_varies = 0;
3989 tree decl_attr = declspecs->decl_attr;
3990 int array_ptr_quals = TYPE_UNQUALIFIED;
3991 tree array_ptr_attrs = NULL_TREE;
3992 int array_parm_static = 0;
3993 bool array_parm_vla_unspec_p = false;
3994 tree returned_attrs = NULL_TREE;
3995 bool bitfield = width != NULL;
3997 struct c_arg_info *arg_info = 0;
3999 if (decl_context == FUNCDEF)
4000 funcdef_flag = true, decl_context = NORMAL;
4002 /* Look inside a declarator for the name being declared
4003 and get it as a string, for an error message. */
4005 const struct c_declarator *decl = declarator;
4014 funcdef_syntax = (decl->kind == cdk_function);
4015 decl = decl->declarator;
4019 decl = decl->declarator;
4024 name = IDENTIFIER_POINTER (decl->u.id);
4036 /* A function definition's declarator must have the form of
4037 a function declarator. */
4039 if (funcdef_flag && !funcdef_syntax)
4042 /* If this looks like a function definition, make it one,
4043 even if it occurs where parms are expected.
4044 Then store_parm_decls will reject it and not use it as a parm. */
4045 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4046 decl_context = PARM;
4048 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4049 warn_deprecated_use (declspecs->type);
4051 if ((decl_context == NORMAL || decl_context == FIELD)
4052 && current_scope == file_scope
4053 && variably_modified_type_p (type, NULL_TREE))
4055 error ("variably modified %qs at file scope", name);
4056 type = integer_type_node;
4059 size_varies = C_TYPE_VARIABLE_SIZE (type);
4061 /* Diagnose defaulting to "int". */
4063 if (declspecs->default_int_p && !in_system_header)
4065 /* Issue a warning if this is an ISO C 99 program or if
4066 -Wreturn-type and this is a function, or if -Wimplicit;
4067 prefer the former warning since it is more explicit. */
4068 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4070 warn_about_return_type = 1;
4072 pedwarn_c99 (flag_isoc99 ? 0 : OPT_Wimplicit_int,
4073 "type defaults to %<int%> in declaration of %qs", name);
4076 /* Adjust the type if a bit-field is being declared,
4077 -funsigned-bitfields applied and the type is not explicitly
4079 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4080 && TREE_CODE (type) == INTEGER_TYPE)
4081 type = c_common_unsigned_type (type);
4083 /* Figure out the type qualifiers for the declaration. There are
4084 two ways a declaration can become qualified. One is something
4085 like `const int i' where the `const' is explicit. Another is
4086 something like `typedef const int CI; CI i' where the type of the
4087 declaration contains the `const'. A third possibility is that
4088 there is a type qualifier on the element type of a typedefed
4089 array type, in which case we should extract that qualifier so
4090 that c_apply_type_quals_to_decl receives the full list of
4091 qualifiers to work with (C90 is not entirely clear about whether
4092 duplicate qualifiers should be diagnosed in this case, but it
4093 seems most appropriate to do so). */
4094 element_type = strip_array_types (type);
4095 constp = declspecs->const_p + TYPE_READONLY (element_type);
4096 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4097 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4098 if (pedantic && !flag_isoc99)
4101 pedwarn (OPT_pedantic, "duplicate %<const%>");
4103 pedwarn (OPT_pedantic, "duplicate %<restrict%>");
4105 pedwarn (OPT_pedantic, "duplicate %<volatile%>");
4107 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4108 type = TYPE_MAIN_VARIANT (type);
4109 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4110 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4111 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4113 /* Warn about storage classes that are invalid for certain
4114 kinds of declarations (parameters, typenames, etc.). */
4118 || storage_class == csc_auto
4119 || storage_class == csc_register
4120 || storage_class == csc_typedef))
4122 if (storage_class == csc_auto)
4123 pedwarn ((current_scope == file_scope) ? 0 : OPT_pedantic,
4124 "function definition declared %<auto%>");
4125 if (storage_class == csc_register)
4126 error ("function definition declared %<register%>");
4127 if (storage_class == csc_typedef)
4128 error ("function definition declared %<typedef%>");
4130 error ("function definition declared %<__thread%>");
4132 if (storage_class == csc_auto
4133 || storage_class == csc_register
4134 || storage_class == csc_typedef)
4135 storage_class = csc_none;
4137 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4139 if (decl_context == PARM && storage_class == csc_register)
4143 switch (decl_context)
4146 error ("storage class specified for structure field %qs",
4150 error ("storage class specified for parameter %qs", name);
4153 error ("storage class specified for typename");
4156 storage_class = csc_none;
4160 else if (storage_class == csc_extern
4164 /* 'extern' with initialization is invalid if not at file scope. */
4165 if (current_scope == file_scope)
4167 /* It is fine to have 'extern const' when compiling at C
4168 and C++ intersection. */
4169 if (!(warn_cxx_compat && constp))
4170 warning (0, "%qs initialized and declared %<extern%>", name);
4173 error ("%qs has both %<extern%> and initializer", name);
4175 else if (current_scope == file_scope)
4177 if (storage_class == csc_auto)
4178 error ("file-scope declaration of %qs specifies %<auto%>", name);
4179 if (pedantic && storage_class == csc_register)
4180 pedwarn (OPT_pedantic, "file-scope declaration of %qs specifies %<register%>", name);
4184 if (storage_class == csc_extern && funcdef_flag)
4185 error ("nested function %qs declared %<extern%>", name);
4186 else if (threadp && storage_class == csc_none)
4188 error ("function-scope %qs implicitly auto and declared "
4195 /* Now figure out the structure of the declarator proper.
4196 Descend through it, creating more complex types, until we reach
4197 the declared identifier (or NULL_TREE, in an absolute declarator).
4198 At each stage we maintain an unqualified version of the type
4199 together with any qualifiers that should be applied to it with
4200 c_build_qualified_type; this way, array types including
4201 multidimensional array types are first built up in unqualified
4202 form and then the qualified form is created with
4203 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4205 while (declarator && declarator->kind != cdk_id)
4207 if (type == error_mark_node)
4209 declarator = declarator->declarator;
4213 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4214 a cdk_pointer (for *...),
4215 a cdk_function (for ...(...)),
4216 a cdk_attrs (for nested attributes),
4217 or a cdk_id (for the name being declared
4218 or the place in an absolute declarator
4219 where the name was omitted).
4220 For the last case, we have just exited the loop.
4222 At this point, TYPE is the type of elements of an array,
4223 or for a function to return, or for a pointer to point to.
4224 After this sequence of ifs, TYPE is the type of the
4225 array or function or pointer, and DECLARATOR has had its
4226 outermost layer removed. */
4228 if (array_ptr_quals != TYPE_UNQUALIFIED
4229 || array_ptr_attrs != NULL_TREE
4230 || array_parm_static)
4232 /* Only the innermost declarator (making a parameter be of
4233 array type which is converted to pointer type)
4234 may have static or type qualifiers. */
4235 error ("static or type qualifiers in non-parameter array declarator");
4236 array_ptr_quals = TYPE_UNQUALIFIED;
4237 array_ptr_attrs = NULL_TREE;
4238 array_parm_static = 0;
4241 switch (declarator->kind)
4245 /* A declarator with embedded attributes. */
4246 tree attrs = declarator->u.attrs;
4247 const struct c_declarator *inner_decl;
4249 declarator = declarator->declarator;
4250 inner_decl = declarator;
4251 while (inner_decl->kind == cdk_attrs)
4252 inner_decl = inner_decl->declarator;
4253 if (inner_decl->kind == cdk_id)
4254 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4255 else if (inner_decl->kind == cdk_function)
4256 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4257 else if (inner_decl->kind == cdk_array)
4258 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4259 returned_attrs = decl_attributes (&type,
4260 chainon (returned_attrs, attrs),
4266 tree itype = NULL_TREE;
4267 tree size = declarator->u.array.dimen;
4268 /* The index is a signed object `sizetype' bits wide. */
4269 tree index_type = c_common_signed_type (sizetype);
4271 array_ptr_quals = declarator->u.array.quals;
4272 array_ptr_attrs = declarator->u.array.attrs;
4273 array_parm_static = declarator->u.array.static_p;
4274 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
4276 declarator = declarator->declarator;
4278 /* Check for some types that there cannot be arrays of. */
4280 if (VOID_TYPE_P (type))
4282 error ("declaration of %qs as array of voids", name);
4283 type = error_mark_node;
4286 if (TREE_CODE (type) == FUNCTION_TYPE)
4288 error ("declaration of %qs as array of functions", name);
4289 type = error_mark_node;
4292 if (pedantic && !in_system_header && flexible_array_type_p (type))
4293 pedwarn (OPT_pedantic, "invalid use of structure with flexible array member");
4295 if (size == error_mark_node)
4296 type = error_mark_node;
4298 if (type == error_mark_node)
4301 /* If size was specified, set ITYPE to a range-type for
4302 that size. Otherwise, ITYPE remains null. finish_decl
4303 may figure it out from an initial value. */
4307 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4309 STRIP_TYPE_NOPS (size);
4311 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4313 error ("size of array %qs has non-integer type", name);
4314 size = integer_one_node;
4317 if (pedantic && integer_zerop (size))
4318 pedwarn (OPT_pedantic, "ISO C forbids zero-size array %qs", name);
4320 if (TREE_CODE (size) == INTEGER_CST)
4322 constant_expression_warning (size);
4323 if (tree_int_cst_sgn (size) < 0)
4325 error ("size of array %qs is negative", name);
4326 size = integer_one_node;
4329 else if ((decl_context == NORMAL || decl_context == FIELD)
4330 && current_scope == file_scope)
4332 error ("variably modified %qs at file scope", name);
4333 size = integer_one_node;
4337 /* Make sure the array size remains visibly
4338 nonconstant even if it is (eg) a const variable
4339 with known value. */
4341 warn_variable_length_array (orig_name, size);
4344 if (integer_zerop (size))
4346 /* A zero-length array cannot be represented with
4347 an unsigned index type, which is what we'll
4348 get with build_index_type. Create an
4349 open-ended range instead. */
4350 itype = build_range_type (sizetype, size, NULL_TREE);
4354 /* Arrange for the SAVE_EXPR on the inside of the
4355 MINUS_EXPR, which allows the -1 to get folded
4356 with the +1 that happens when building TYPE_SIZE. */
4358 size = variable_size (size);
4360 /* Compute the maximum valid index, that is, size
4361 - 1. Do the calculation in index_type, so that
4362 if it is a variable the computations will be
4363 done in the proper mode. */
4364 itype = fold_build2 (MINUS_EXPR, index_type,
4365 convert (index_type, size),
4366 convert (index_type,
4369 /* If that overflowed, the array is too big. ???
4370 While a size of INT_MAX+1 technically shouldn't
4371 cause an overflow (because we subtract 1), the
4372 overflow is recorded during the conversion to
4373 index_type, before the subtraction. Handling
4374 this case seems like an unnecessary
4376 if (TREE_CODE (itype) == INTEGER_CST
4377 && TREE_OVERFLOW (itype))
4379 error ("size of array %qs is too large", name);
4380 type = error_mark_node;
4384 itype = build_index_type (itype);
4387 else if (decl_context == FIELD)
4389 if (pedantic && !flag_isoc99 && !in_system_header)
4390 pedwarn (OPT_pedantic, "ISO C90 does not support flexible array members");
4392 /* ISO C99 Flexible array members are effectively
4393 identical to GCC's zero-length array extension. */
4394 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4396 else if (decl_context == PARM)
4398 if (array_parm_vla_unspec_p)
4403 error ("%<[*]%> not allowed in other than a declaration");
4406 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4410 else if (decl_context == TYPENAME)
4412 if (array_parm_vla_unspec_p)
4414 /* The error is printed elsewhere. We use this to
4415 avoid messing up with incomplete array types of
4416 the same type, that would otherwise be modified
4418 itype = build_range_type (sizetype, size_zero_node,
4423 /* Complain about arrays of incomplete types. */
4424 if (!COMPLETE_TYPE_P (type))
4426 error ("array type has incomplete element type");
4427 type = error_mark_node;
4430 /* When itype is NULL, a shared incomplete array type is
4431 returned for all array of a given type. Elsewhere we
4432 make sure we don't complete that type before copying
4433 it, but here we want to make sure we don't ever
4434 modify the shared type, so we gcc_assert (itype)
4436 type = build_array_type (type, itype);
4438 if (type != error_mark_node)
4442 /* It is ok to modify type here even if itype is
4443 NULL: if size_varies, we're in a
4444 multi-dimensional array and the inner type has
4445 variable size, so the enclosing shared array type
4447 if (size && TREE_CODE (size) == INTEGER_CST)
4449 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
4450 C_TYPE_VARIABLE_SIZE (type) = 1;
4453 /* The GCC extension for zero-length arrays differs from
4454 ISO flexible array members in that sizeof yields
4456 if (size && integer_zerop (size))
4459 TYPE_SIZE (type) = bitsize_zero_node;
4460 TYPE_SIZE_UNIT (type) = size_zero_node;
4462 if (array_parm_vla_unspec_p)
4465 /* The type is complete. C99 6.7.5.2p4 */
4466 TYPE_SIZE (type) = bitsize_zero_node;
4467 TYPE_SIZE_UNIT (type) = size_zero_node;
4471 if (decl_context != PARM
4472 && (array_ptr_quals != TYPE_UNQUALIFIED
4473 || array_ptr_attrs != NULL_TREE
4474 || array_parm_static))
4476 error ("static or type qualifiers in non-parameter array declarator");
4477 array_ptr_quals = TYPE_UNQUALIFIED;
4478 array_ptr_attrs = NULL_TREE;
4479 array_parm_static = 0;
4485 /* Say it's a definition only for the declarator closest
4486 to the identifier, apart possibly from some
4488 bool really_funcdef = false;
4492 const struct c_declarator *t = declarator->declarator;
4493 while (t->kind == cdk_attrs)
4495 really_funcdef = (t->kind == cdk_id);
4498 /* Declaring a function type. Make sure we have a valid
4499 type for the function to return. */
4500 if (type == error_mark_node)
4505 /* Warn about some types functions can't return. */
4506 if (TREE_CODE (type) == FUNCTION_TYPE)
4508 error ("%qs declared as function returning a function", name);
4509 type = integer_type_node;
4511 if (TREE_CODE (type) == ARRAY_TYPE)
4513 error ("%qs declared as function returning an array", name);
4514 type = integer_type_node;
4517 /* Construct the function type and go to the next
4518 inner layer of declarator. */
4519 arg_info = declarator->u.arg_info;
4520 arg_types = grokparms (arg_info, really_funcdef);
4522 put_pending_sizes (arg_info->pending_sizes);
4524 /* Type qualifiers before the return type of the function
4525 qualify the return type, not the function type. */
4528 /* Type qualifiers on a function return type are
4529 normally permitted by the standard but have no
4530 effect, so give a warning at -Wreturn-type.
4531 Qualifiers on a void return type are banned on
4532 function definitions in ISO C; GCC used to used
4533 them for noreturn functions. */
4534 if (VOID_TYPE_P (type) && really_funcdef)
4535 pedwarn (0, "function definition has qualified void return type");
4537 warning (OPT_Wignored_qualifiers,
4538 "type qualifiers ignored on function return type");
4540 type = c_build_qualified_type (type, type_quals);
4542 type_quals = TYPE_UNQUALIFIED;
4544 type = build_function_type (type, arg_types);
4545 declarator = declarator->declarator;
4547 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4548 the formal parameter list of this FUNCTION_TYPE to point to
4549 the FUNCTION_TYPE node itself. */
4553 for (link = arg_info->tags;
4555 link = TREE_CHAIN (link))
4556 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4562 /* Merge any constancy or volatility into the target type
4565 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4567 pedwarn (OPT_pedantic, "ISO C forbids qualified function types");
4569 type = c_build_qualified_type (type, type_quals);
4572 /* When the pointed-to type involves components of variable size,
4573 care must be taken to ensure that the size evaluation code is
4574 emitted early enough to dominate all the possible later uses
4575 and late enough for the variables on which it depends to have
4578 This is expected to happen automatically when the pointed-to
4579 type has a name/declaration of it's own, but special attention
4580 is required if the type is anonymous.
4582 We handle the NORMAL and FIELD contexts here by attaching an
4583 artificial TYPE_DECL to such pointed-to type. This forces the
4584 sizes evaluation at a safe point and ensures it is not deferred
4585 until e.g. within a deeper conditional context.
4587 We expect nothing to be needed here for PARM or TYPENAME.
4588 Pushing a TYPE_DECL at this point for TYPENAME would actually
4589 be incorrect, as we might be in the middle of an expression
4590 with side effects on the pointed-to type size "arguments" prior
4591 to the pointer declaration point and the fake TYPE_DECL in the
4592 enclosing context would force the size evaluation prior to the
4595 if (!TYPE_NAME (type)
4596 && (decl_context == NORMAL || decl_context == FIELD)
4597 && variably_modified_type_p (type, NULL_TREE))
4599 tree decl = build_decl (TYPE_DECL, NULL_TREE, type);
4600 DECL_ARTIFICIAL (decl) = 1;
4602 finish_decl (decl, NULL_TREE, NULL_TREE);
4603 TYPE_NAME (type) = decl;
4606 type = build_pointer_type (type);
4608 /* Process type qualifiers (such as const or volatile)
4609 that were given inside the `*'. */
4610 type_quals = declarator->u.pointer_quals;
4612 declarator = declarator->declarator;
4619 *decl_attrs = chainon (returned_attrs, *decl_attrs);
4621 /* Now TYPE has the actual type, apart from any qualifiers in
4624 /* Check the type and width of a bit-field. */
4626 check_bitfield_type_and_width (&type, width, orig_name);
4628 /* Did array size calculations overflow? */
4630 if (TREE_CODE (type) == ARRAY_TYPE
4631 && COMPLETE_TYPE_P (type)
4632 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4633 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4635 error ("size of array %qs is too large", name);
4636 /* If we proceed with the array type as it is, we'll eventually
4637 crash in tree_low_cst(). */
4638 type = error_mark_node;
4641 /* If this is declaring a typedef name, return a TYPE_DECL. */
4643 if (storage_class == csc_typedef)
4646 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4648 pedwarn (OPT_pedantic, "ISO C forbids qualified function types");
4650 type = c_build_qualified_type (type, type_quals);
4651 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4652 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4653 if (declspecs->explicit_signed_p)
4654 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4655 if (declspecs->inline_p)
4656 pedwarn (0, "typedef %q+D declared %<inline%>", decl);
4660 /* If this is a type name (such as, in a cast or sizeof),
4661 compute the type and return it now. */
4663 if (decl_context == TYPENAME)
4665 /* Note that the grammar rejects storage classes in typenames
4667 gcc_assert (storage_class == csc_none && !threadp
4668 && !declspecs->inline_p);
4669 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4671 pedwarn (OPT_pedantic, "ISO C forbids const or volatile function types");
4673 type = c_build_qualified_type (type, type_quals);
4677 if (pedantic && decl_context == FIELD
4678 && variably_modified_type_p (type, NULL_TREE))
4681 pedwarn (OPT_pedantic,
4682 "a member of a structure or union cannot have a variably modified type");
4685 /* Aside from typedefs and type names (handle above),
4686 `void' at top level (not within pointer)
4687 is allowed only in public variables.
4688 We don't complain about parms either, but that is because
4689 a better error message can be made later. */
4691 if (VOID_TYPE_P (type) && decl_context != PARM
4692 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4693 && (storage_class == csc_extern
4694 || (current_scope == file_scope
4695 && !(storage_class == csc_static
4696 || storage_class == csc_register)))))
4698 error ("variable or field %qs declared void", name);
4699 type = integer_type_node;
4702 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4703 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4708 if (decl_context == PARM)
4712 /* A parameter declared as an array of T is really a pointer to T.
4713 One declared as a function is really a pointer to a function. */
4715 if (TREE_CODE (type) == ARRAY_TYPE)
4717 /* Transfer const-ness of array into that of type pointed to. */
4718 type = TREE_TYPE (type);
4720 type = c_build_qualified_type (type, type_quals);
4721 type = build_pointer_type (type);
4722 type_quals = array_ptr_quals;
4724 type = c_build_qualified_type (type, type_quals);
4726 /* We don't yet implement attributes in this context. */
4727 if (array_ptr_attrs != NULL_TREE)
4728 warning (OPT_Wattributes,
4729 "attributes in parameter array declarator ignored");
4733 else if (TREE_CODE (type) == FUNCTION_TYPE)
4736 pedwarn (OPT_pedantic, "ISO C forbids qualified function types");
4738 type = c_build_qualified_type (type, type_quals);
4739 type = build_pointer_type (type);
4740 type_quals = TYPE_UNQUALIFIED;
4742 else if (type_quals)
4743 type = c_build_qualified_type (type, type_quals);
4745 decl = build_decl (PARM_DECL, declarator->u.id, type);
4746 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4748 C_DECL_VARIABLE_SIZE (decl) = 1;
4750 /* Compute the type actually passed in the parmlist,
4751 for the case where there is no prototype.
4752 (For example, shorts and chars are passed as ints.)
4753 When there is a prototype, this is overridden later. */
4755 if (type == error_mark_node)
4756 promoted_type = type;
4758 promoted_type = c_type_promotes_to (type);
4760 DECL_ARG_TYPE (decl) = promoted_type;
4761 if (declspecs->inline_p)
4762 pedwarn (0, "parameter %q+D declared %<inline%>", decl);
4764 else if (decl_context == FIELD)
4766 /* Note that the grammar rejects storage classes in typenames
4768 gcc_assert (storage_class == csc_none && !threadp
4769 && !declspecs->inline_p);
4771 /* Structure field. It may not be a function. */
4773 if (TREE_CODE (type) == FUNCTION_TYPE)
4775 error ("field %qs declared as a function", name);
4776 type = build_pointer_type (type);
4778 else if (TREE_CODE (type) != ERROR_MARK
4779 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4781 error ("field %qs has incomplete type", name);
4782 type = error_mark_node;
4784 type = c_build_qualified_type (type, type_quals);
4785 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4786 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4787 DECL_NONADDRESSABLE_P (decl) = bitfield;
4788 if (bitfield && !declarator->u.id)
4789 TREE_NO_WARNING (decl) = 1;
4792 C_DECL_VARIABLE_SIZE (decl) = 1;
4794 else if (TREE_CODE (type) == FUNCTION_TYPE)
4796 if (storage_class == csc_register || threadp)
4798 error ("invalid storage class for function %qs", name);
4800 else if (current_scope != file_scope)
4802 /* Function declaration not at file scope. Storage
4803 classes other than `extern' are not allowed, C99
4804 6.7.1p5, and `extern' makes no difference. However,
4805 GCC allows 'auto', perhaps with 'inline', to support
4806 nested functions. */
4807 if (storage_class == csc_auto)
4808 pedwarn (OPT_pedantic, "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 (OPT_pedantic,
4825 "ISO C forbids qualified function types");
4827 /* GNU C interprets a volatile-qualified function type to indicate
4828 that the function does not return. */
4829 if ((type_quals & TYPE_QUAL_VOLATILE)
4830 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4831 warning (0, "%<noreturn%> function returns non-void value");
4833 /* Every function declaration is an external reference
4834 (DECL_EXTERNAL) except for those which are not at file
4835 scope and are explicitly declared "auto". This is
4836 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4837 GCC to signify a forward declaration of a nested function. */
4838 if (storage_class == csc_auto && current_scope != file_scope)
4839 DECL_EXTERNAL (decl) = 0;
4840 /* In C99, a function which is declared 'inline' with 'extern'
4841 is not an external reference (which is confusing). It
4842 means that the later definition of the function must be output
4843 in this file, C99 6.7.4p6. In GNU C89, a function declared
4844 'extern inline' is an external reference. */
4845 else if (declspecs->inline_p && storage_class != csc_static)
4846 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
4847 == flag_gnu89_inline);
4849 DECL_EXTERNAL (decl) = !initialized;
4851 /* Record absence of global scope for `static' or `auto'. */
4853 = !(storage_class == csc_static || storage_class == csc_auto);
4855 /* For a function definition, record the argument information
4856 block where store_parm_decls will look for it. */
4858 current_function_arg_info = arg_info;
4860 if (declspecs->default_int_p)
4861 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4863 /* Record presence of `inline', if it is reasonable. */
4864 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4866 if (declspecs->inline_p)
4867 pedwarn (0, "cannot inline function %<main%>");
4869 else if (declspecs->inline_p)
4871 /* Record that the function is declared `inline'. */
4872 DECL_DECLARED_INLINE_P (decl) = 1;
4874 /* Do not mark bare declarations as DECL_INLINE. Doing so
4875 in the presence of multiple declarations can result in
4876 the abstract origin pointing between the declarations,
4877 which will confuse dwarf2out. */
4879 DECL_INLINE (decl) = 1;
4881 /* If -finline-functions, assume it can be inlined. This does
4882 two things: let the function be deferred until it is actually
4883 needed, and let dwarf2 know that the function is inlinable. */
4884 else if (flag_inline_trees == 2 && initialized)
4885 DECL_INLINE (decl) = 1;
4889 /* It's a variable. */
4890 /* An uninitialized decl with `extern' is a reference. */
4891 int extern_ref = !initialized && storage_class == csc_extern;
4893 type = c_build_qualified_type (type, type_quals);
4895 /* C99 6.2.2p7: It is invalid (compile-time undefined
4896 behavior) to create an 'extern' declaration for a
4897 variable if there is a global declaration that is
4898 'static' and the global declaration is not visible.
4899 (If the static declaration _is_ currently visible,
4900 the 'extern' declaration is taken to refer to that decl.) */
4901 if (extern_ref && current_scope != file_scope)
4903 tree global_decl = identifier_global_value (declarator->u.id);
4904 tree visible_decl = lookup_name (declarator->u.id);
4907 && global_decl != visible_decl
4908 && TREE_CODE (global_decl) == VAR_DECL
4909 && !TREE_PUBLIC (global_decl))
4910 error ("variable previously declared %<static%> redeclared "
4914 decl = build_decl (VAR_DECL, declarator->u.id, type);
4915 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4917 C_DECL_VARIABLE_SIZE (decl) = 1;
4919 if (declspecs->inline_p)
4920 pedwarn (0, "variable %q+D declared %<inline%>", decl);
4922 /* At file scope, an initialized extern declaration may follow
4923 a static declaration. In that case, DECL_EXTERNAL will be
4924 reset later in start_decl. */
4925 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4927 /* At file scope, the presence of a `static' or `register' storage
4928 class specifier, or the absence of all storage class specifiers
4929 makes this declaration a definition (perhaps tentative). Also,
4930 the absence of `static' makes it public. */
4931 if (current_scope == file_scope)
4933 TREE_PUBLIC (decl) = storage_class != csc_static;
4934 TREE_STATIC (decl) = !extern_ref;
4936 /* Not at file scope, only `static' makes a static definition. */
4939 TREE_STATIC (decl) = (storage_class == csc_static);
4940 TREE_PUBLIC (decl) = extern_ref;
4944 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4947 if (storage_class == csc_extern
4948 && variably_modified_type_p (type, NULL_TREE))
4951 error ("object with variably modified type must have no linkage");
4954 /* Record `register' declaration for warnings on &
4955 and in case doing stupid register allocation. */
4957 if (storage_class == csc_register)
4959 C_DECL_REGISTER (decl) = 1;
4960 DECL_REGISTER (decl) = 1;
4963 /* Record constancy and volatility. */
4964 c_apply_type_quals_to_decl (type_quals, decl);
4966 /* If a type has volatile components, it should be stored in memory.
4967 Otherwise, the fact that those components are volatile
4968 will be ignored, and would even crash the compiler.
4969 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4970 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4971 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4972 || TREE_CODE (decl) == RESULT_DECL))
4974 /* It is not an error for a structure with volatile fields to
4975 be declared register, but reset DECL_REGISTER since it
4976 cannot actually go in a register. */
4977 int was_reg = C_DECL_REGISTER (decl);
4978 C_DECL_REGISTER (decl) = 0;
4979 DECL_REGISTER (decl) = 0;
4980 c_mark_addressable (decl);
4981 C_DECL_REGISTER (decl) = was_reg;
4984 /* This is the earliest point at which we might know the assembler
4985 name of a variable. Thus, if it's known before this, die horribly. */
4986 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4992 /* Decode the parameter-list info for a function type or function definition.
4993 The argument is the value returned by `get_parm_info' (or made in c-parse.c
4994 if there is an identifier list instead of a parameter decl list).
4995 These two functions are separate because when a function returns
4996 or receives functions then each is called multiple times but the order
4997 of calls is different. The last call to `grokparms' is always the one
4998 that contains the formal parameter names of a function definition.
5000 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5002 FUNCDEF_FLAG is true for a function definition, false for
5003 a mere declaration. A nonempty identifier-list gets an error message
5004 when FUNCDEF_FLAG is false. */
5007 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
5009 tree arg_types = arg_info->types;
5011 if (funcdef_flag && arg_info->had_vla_unspec)
5013 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5015 error ("%<[*]%> not allowed in other than function prototype scope");
5018 if (arg_types == 0 && !funcdef_flag && !in_system_header)
5019 warning (OPT_Wstrict_prototypes,
5020 "function declaration isn%'t a prototype");
5022 if (arg_types == error_mark_node)
5023 return 0; /* don't set TYPE_ARG_TYPES in this case */
5025 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
5028 pedwarn (0, "parameter names (without types) in function declaration");
5030 arg_info->parms = arg_info->types;
5031 arg_info->types = 0;
5036 tree parm, type, typelt;
5037 unsigned int parmno;
5039 /* If there is a parameter of incomplete type in a definition,
5040 this is an error. In a declaration this is valid, and a
5041 struct or union type may be completed later, before any calls
5042 or definition of the function. In the case where the tag was
5043 first declared within the parameter list, a warning has
5044 already been given. If a parameter has void type, then
5045 however the function cannot be defined or called, so
5048 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
5050 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
5052 type = TREE_VALUE (typelt);
5053 if (type == error_mark_node)
5056 if (!COMPLETE_TYPE_P (type))
5060 if (DECL_NAME (parm))
5061 error ("parameter %u (%q+D) has incomplete type",
5064 error ("%Jparameter %u has incomplete type",
5067 TREE_VALUE (typelt) = error_mark_node;
5068 TREE_TYPE (parm) = error_mark_node;
5070 else if (VOID_TYPE_P (type))
5072 if (DECL_NAME (parm))
5073 warning (0, "parameter %u (%q+D) has void type",
5076 warning (0, "%Jparameter %u has void type",
5081 if (DECL_NAME (parm) && TREE_USED (parm))
5082 warn_if_shadowing (parm);
5088 /* Take apart the current scope and return a c_arg_info structure with
5089 info on a parameter list just parsed.
5091 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5093 ELLIPSIS being true means the argument list ended in '...' so don't
5094 append a sentinel (void_list_node) to the end of the type-list. */
5097 get_parm_info (bool ellipsis)
5099 struct c_binding *b = current_scope->bindings;
5100 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
5107 static bool explained_incomplete_types = false;
5108 bool gave_void_only_once_err = false;
5110 arg_info->parms = 0;
5112 arg_info->types = 0;
5113 arg_info->others = 0;
5114 arg_info->pending_sizes = 0;
5115 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
5117 /* The bindings in this scope must not get put into a block.
5118 We will take care of deleting the binding nodes. */
5119 current_scope->bindings = 0;
5121 /* This function is only called if there was *something* on the
5125 /* A parameter list consisting solely of 'void' indicates that the
5126 function takes no arguments. But if the 'void' is qualified
5127 (by 'const' or 'volatile'), or has a storage class specifier
5128 ('register'), then the behavior is undefined; issue an error.
5129 Typedefs for 'void' are OK (see DR#157). */
5130 if (b->prev == 0 /* one binding */
5131 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
5132 && !DECL_NAME (b->decl) /* anonymous */
5133 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
5135 if (TREE_THIS_VOLATILE (b->decl)
5136 || TREE_READONLY (b->decl)
5137 || C_DECL_REGISTER (b->decl))
5138 error ("%<void%> as only parameter may not be qualified");
5140 /* There cannot be an ellipsis. */
5142 error ("%<void%> must be the only parameter");
5144 arg_info->types = void_list_node;
5149 types = void_list_node;
5151 /* Break up the bindings list into parms, tags, types, and others;
5152 apply sanity checks; purge the name-to-decl bindings. */
5155 tree decl = b->decl;
5156 tree type = TREE_TYPE (decl);
5157 const char *keyword;
5159 switch (TREE_CODE (decl))
5164 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5165 I_SYMBOL_BINDING (b->id) = b->shadowed;
5168 /* Check for forward decls that never got their actual decl. */
5169 if (TREE_ASM_WRITTEN (decl))
5170 error ("parameter %q+D has just a forward declaration", decl);
5171 /* Check for (..., void, ...) and issue an error. */
5172 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
5174 if (!gave_void_only_once_err)
5176 error ("%<void%> must be the only parameter");
5177 gave_void_only_once_err = true;
5182 /* Valid parameter, add it to the list. */
5183 TREE_CHAIN (decl) = parms;
5186 /* Since there is a prototype, args are passed in their
5187 declared types. The back end may override this later. */
5188 DECL_ARG_TYPE (decl) = type;
5189 types = tree_cons (0, type, types);
5193 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
5194 case UNION_TYPE: keyword = "union"; goto tag;
5195 case RECORD_TYPE: keyword = "struct"; goto tag;
5197 /* Types may not have tag-names, in which case the type
5198 appears in the bindings list with b->id NULL. */
5201 gcc_assert (I_TAG_BINDING (b->id) == b);
5202 I_TAG_BINDING (b->id) = b->shadowed;
5205 /* Warn about any struct, union or enum tags defined in a
5206 parameter list. The scope of such types is limited to
5207 the parameter list, which is rarely if ever desirable
5208 (it's impossible to call such a function with type-
5209 correct arguments). An anonymous union parm type is
5210 meaningful as a GNU extension, so don't warn for that. */
5211 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
5214 /* The %s will be one of 'struct', 'union', or 'enum'. */
5215 warning (0, "%<%s %E%> declared inside parameter list",
5218 /* The %s will be one of 'struct', 'union', or 'enum'. */
5219 warning (0, "anonymous %s declared inside parameter list",
5222 if (!explained_incomplete_types)
5224 warning (0, "its scope is only this definition or declaration,"
5225 " which is probably not what you want");
5226 explained_incomplete_types = true;
5230 tags = tree_cons (b->id, decl, tags);
5236 /* CONST_DECLs appear here when we have an embedded enum,
5237 and TYPE_DECLs appear here when we have an embedded struct
5238 or union. No warnings for this - we already warned about the
5239 type itself. FUNCTION_DECLs appear when there is an implicit
5240 function declaration in the parameter list. */
5242 TREE_CHAIN (decl) = others;
5247 /* error_mark_node appears here when we have an undeclared
5248 variable. Just throw it away. */
5251 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5252 I_SYMBOL_BINDING (b->id) = b->shadowed;
5256 /* Other things that might be encountered. */
5263 b = free_binding_and_advance (b);
5266 arg_info->parms = parms;
5267 arg_info->tags = tags;
5268 arg_info->types = types;
5269 arg_info->others = others;
5270 arg_info->pending_sizes = get_pending_sizes ();
5274 /* Get the struct, enum or union (CODE says which) with tag NAME.
5275 Define the tag as a forward-reference if it is not defined.
5276 Return a c_typespec structure for the type specifier. */
5279 parser_xref_tag (enum tree_code code, tree name)
5281 struct c_typespec ret;
5282 /* If a cross reference is requested, look up the type
5283 already defined for this tag and return it. */
5285 tree ref = lookup_tag (code, name, 0);
5286 /* If this is the right type of tag, return what we found.
5287 (This reference will be shadowed by shadow_tag later if appropriate.)
5288 If this is the wrong type of tag, do not return it. If it was the
5289 wrong type in the same scope, we will have had an error
5290 message already; if in a different scope and declaring
5291 a name, pending_xref_error will give an error message; but if in a
5292 different scope and not declaring a name, this tag should
5293 shadow the previous declaration of a different type of tag, and
5294 this would not work properly if we return the reference found.
5295 (For example, with "struct foo" in an outer scope, "union foo;"
5296 must shadow that tag with a new one of union type.) */
5297 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5298 if (ref && TREE_CODE (ref) == code)
5304 /* If no such tag is yet defined, create a forward-reference node
5305 and record it as the "definition".
5306 When a real declaration of this type is found,
5307 the forward-reference will be altered into a real type. */
5309 ref = make_node (code);
5310 if (code == ENUMERAL_TYPE)
5312 /* Give the type a default layout like unsigned int
5313 to avoid crashing if it does not get defined. */
5314 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5315 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5316 TYPE_USER_ALIGN (ref) = 0;
5317 TYPE_UNSIGNED (ref) = 1;
5318 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5319 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5320 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5323 pushtag (name, ref);
5329 /* Get the struct, enum or union (CODE says which) with tag NAME.
5330 Define the tag as a forward-reference if it is not defined.
5331 Return a tree for the type. */
5334 xref_tag (enum tree_code code, tree name)
5336 return parser_xref_tag (code, name).spec;
5339 /* Make sure that the tag NAME is defined *in the current scope*
5340 at least as a forward reference.
5341 CODE says which kind of tag NAME ought to be. */
5344 start_struct (enum tree_code code, tree name)
5346 /* If there is already a tag defined at this scope
5347 (as a forward reference), just return it. */
5352 ref = lookup_tag (code, name, 1);
5353 if (ref && TREE_CODE (ref) == code)
5355 if (TYPE_SIZE (ref))
5357 if (code == UNION_TYPE)
5358 error ("redefinition of %<union %E%>", name);
5360 error ("redefinition of %<struct %E%>", name);
5362 else if (C_TYPE_BEING_DEFINED (ref))
5364 if (code == UNION_TYPE)
5365 error ("nested redefinition of %<union %E%>", name);
5367 error ("nested redefinition of %<struct %E%>", name);
5368 /* Don't create structures that contain themselves. */
5373 /* Otherwise create a forward-reference just so the tag is in scope. */
5375 if (ref == NULL_TREE || TREE_CODE (ref) != code)
5377 ref = make_node (code);
5378 pushtag (name, ref);
5381 C_TYPE_BEING_DEFINED (ref) = 1;
5382 TYPE_PACKED (ref) = flag_pack_struct;
5386 /* Process the specs, declarator and width (NULL if omitted)
5387 of a structure component, returning a FIELD_DECL node.
5388 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5389 DECL_ATTRS is as for grokdeclarator.
5391 This is done during the parsing of the struct declaration.
5392 The FIELD_DECL nodes are chained together and the lot of them
5393 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5396 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5397 tree width, tree *decl_attrs)
5401 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5402 && width == NULL_TREE)
5404 /* This is an unnamed decl.
5406 If we have something of the form "union { list } ;" then this
5407 is the anonymous union extension. Similarly for struct.
5409 If this is something of the form "struct foo;", then
5410 If MS extensions are enabled, this is handled as an
5412 Otherwise this is a forward declaration of a structure tag.
5414 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5415 If MS extensions are enabled and foo names a structure, then
5416 again this is an anonymous struct.
5417 Otherwise this is an error.
5419 Oh what a horrid tangled web we weave. I wonder if MS consciously
5420 took this from Plan 9 or if it was an accident of implementation
5421 that took root before someone noticed the bug... */
5423 tree type = declspecs->type;
5424 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5425 || TREE_CODE (type) == UNION_TYPE);
5429 && (flag_ms_extensions || !declspecs->typedef_p))
5431 if (flag_ms_extensions)
5435 else if (TYPE_NAME (type) == NULL)
5442 pedwarn (0, "declaration does not declare anything");
5445 pedwarn (OPT_pedantic, "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 (OPT_pedantic, "union has no named members");
5546 pedwarn (OPT_pedantic, "union has no members");
5551 pedwarn (OPT_pedantic, "struct has no named members");
5553 pedwarn (OPT_pedantic, "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 (OPT_pedantic,
5633 "%Jinvalid use of structure with flexible array member", x);
5636 saw_named_field = 1;
5639 detect_field_duplicates (fieldlist);
5641 /* Now we have the nearly final fieldlist. Record it,
5642 then lay out the structure or union (including the fields). */
5644 TYPE_FIELDS (t) = fieldlist;
5648 /* Give bit-fields their proper types. */
5650 tree *fieldlistp = &fieldlist;
5652 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5653 && TREE_TYPE (*fieldlistp) != error_mark_node)
5655 unsigned HOST_WIDE_INT width
5656 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5657 tree type = TREE_TYPE (*fieldlistp);
5658 if (width != TYPE_PRECISION (type))
5660 TREE_TYPE (*fieldlistp)
5661 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5662 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5664 DECL_INITIAL (*fieldlistp) = 0;
5667 fieldlistp = &TREE_CHAIN (*fieldlistp);
5670 /* Now we have the truly final field list.
5671 Store it in this type and in the variants. */
5673 TYPE_FIELDS (t) = fieldlist;
5675 /* If there are lots of fields, sort so we can look through them fast.
5676 We arbitrarily consider 16 or more elts to be "a lot". */
5681 for (x = fieldlist; x; x = TREE_CHAIN (x))
5683 if (len > 15 || DECL_NAME (x) == NULL)
5691 struct lang_type *space;
5692 struct sorted_fields_type *space2;
5694 len += list_length (x);
5696 /* Use the same allocation policy here that make_node uses, to
5697 ensure that this lives as long as the rest of the struct decl.
5698 All decls in an inline function need to be saved. */
5700 space = GGC_CNEW (struct lang_type);
5701 space2 = GGC_NEWVAR (struct sorted_fields_type,
5702 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5706 field_array = &space2->elts[0];
5707 for (x = fieldlist; x; x = TREE_CHAIN (x))
5709 field_array[len++] = x;
5711 /* If there is anonymous struct or union, break out of the loop. */
5712 if (DECL_NAME (x) == NULL)
5715 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5718 TYPE_LANG_SPECIFIC (t) = space;
5719 TYPE_LANG_SPECIFIC (t)->s->len = len;
5720 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5721 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5726 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5728 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5729 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5730 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5731 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5732 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5735 /* If this was supposed to be a transparent union, but we can't
5736 make it one, warn and turn off the flag. */
5737 if (TREE_CODE (t) == UNION_TYPE
5738 && TYPE_TRANSPARENT_UNION (t)
5739 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5741 TYPE_TRANSPARENT_UNION (t) = 0;
5742 warning (0, "union cannot be made transparent");
5745 /* If this structure or union completes the type of any previous
5746 variable declaration, lay it out and output its rtl. */
5747 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5751 tree decl = TREE_VALUE (x);
5752 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5753 layout_array_type (TREE_TYPE (decl));
5754 if (TREE_CODE (decl) != TYPE_DECL)
5756 layout_decl (decl, 0);
5757 if (c_dialect_objc ())
5758 objc_check_decl (decl);
5759 rest_of_decl_compilation (decl, toplevel, 0);
5764 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5766 /* Finish debugging output for this type. */
5767 rest_of_type_compilation (t, toplevel);
5769 /* If we're inside a function proper, i.e. not file-scope and not still
5770 parsing parameters, then arrange for the size of a variable sized type
5772 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
5773 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5778 /* Lay out the type T, and its element type, and so on. */
5781 layout_array_type (tree t)
5783 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5784 layout_array_type (TREE_TYPE (t));
5788 /* Begin compiling the definition of an enumeration type.
5789 NAME is its name (or null if anonymous).
5790 Returns the type object, as yet incomplete.
5791 Also records info about it so that build_enumerator
5792 may be used to declare the individual values as they are read. */
5795 start_enum (struct c_enum_contents *the_enum, tree name)
5799 /* If this is the real definition for a previous forward reference,
5800 fill in the contents in the same object that used to be the
5801 forward reference. */
5804 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5806 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5808 enumtype = make_node (ENUMERAL_TYPE);
5809 pushtag (name, enumtype);
5812 if (C_TYPE_BEING_DEFINED (enumtype))
5813 error ("nested redefinition of %<enum %E%>", name);
5815 C_TYPE_BEING_DEFINED (enumtype) = 1;
5817 if (TYPE_VALUES (enumtype) != 0)
5819 /* This enum is a named one that has been declared already. */
5820 error ("redeclaration of %<enum %E%>", name);
5822 /* Completely replace its old definition.
5823 The old enumerators remain defined, however. */
5824 TYPE_VALUES (enumtype) = 0;
5827 the_enum->enum_next_value = integer_zero_node;
5828 the_enum->enum_overflow = 0;
5830 if (flag_short_enums)
5831 TYPE_PACKED (enumtype) = 1;
5836 /* After processing and defining all the values of an enumeration type,
5837 install their decls in the enumeration type and finish it off.
5838 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5839 and ATTRIBUTES are the specified attributes.
5840 Returns ENUMTYPE. */
5843 finish_enum (tree enumtype, tree values, tree attributes)
5846 tree minnode = 0, maxnode = 0;
5847 int precision, unsign;
5848 bool toplevel = (file_scope == current_scope);
5849 struct lang_type *lt;
5851 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5853 /* Calculate the maximum value of any enumerator in this type. */
5855 if (values == error_mark_node)
5856 minnode = maxnode = integer_zero_node;
5859 minnode = maxnode = TREE_VALUE (values);
5860 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5862 tree value = TREE_VALUE (pair);
5863 if (tree_int_cst_lt (maxnode, value))
5865 if (tree_int_cst_lt (value, minnode))
5870 /* Construct the final type of this enumeration. It is the same
5871 as one of the integral types - the narrowest one that fits, except
5872 that normally we only go as narrow as int - and signed iff any of
5873 the values are negative. */
5874 unsign = (tree_int_cst_sgn (minnode) >= 0);
5875 precision = MAX (min_precision (minnode, unsign),
5876 min_precision (maxnode, unsign));
5878 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5880 tem = c_common_type_for_size (precision, unsign);
5883 warning (0, "enumeration values exceed range of largest integer");
5884 tem = long_long_integer_type_node;
5888 tem = unsign ? unsigned_type_node : integer_type_node;
5890 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5891 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5892 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5893 TYPE_SIZE (enumtype) = 0;
5895 /* If the precision of the type was specific with an attribute and it
5896 was too small, give an error. Otherwise, use it. */
5897 if (TYPE_PRECISION (enumtype))
5899 if (precision > TYPE_PRECISION (enumtype))
5900 error ("specified mode too small for enumeral values");
5903 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5905 layout_type (enumtype);
5907 if (values != error_mark_node)
5909 /* Change the type of the enumerators to be the enum type. We
5910 need to do this irrespective of the size of the enum, for
5911 proper type checking. Replace the DECL_INITIALs of the
5912 enumerators, and the value slots of the list, with copies
5913 that have the enum type; they cannot be modified in place
5914 because they may be shared (e.g. integer_zero_node) Finally,
5915 change the purpose slots to point to the names of the decls. */
5916 for (pair = values; pair; pair = TREE_CHAIN (pair))
5918 tree enu = TREE_PURPOSE (pair);
5919 tree ini = DECL_INITIAL (enu);
5921 TREE_TYPE (enu) = enumtype;
5923 /* The ISO C Standard mandates enumerators to have type int,
5924 even though the underlying type of an enum type is
5925 unspecified. Here we convert any enumerators that fit in
5926 an int to type int, to avoid promotions to unsigned types
5927 when comparing integers with enumerators that fit in the
5928 int range. When -pedantic is given, build_enumerator()
5929 would have already taken care of those that don't fit. */
5930 if (int_fits_type_p (ini, integer_type_node))
5931 tem = integer_type_node;
5934 ini = convert (tem, ini);
5936 DECL_INITIAL (enu) = ini;
5937 TREE_PURPOSE (pair) = DECL_NAME (enu);
5938 TREE_VALUE (pair) = ini;
5941 TYPE_VALUES (enumtype) = values;
5944 /* Record the min/max values so that we can warn about bit-field
5945 enumerations that are too small for the values. */
5946 lt = GGC_CNEW (struct lang_type);
5947 lt->enum_min = minnode;
5948 lt->enum_max = maxnode;
5949 TYPE_LANG_SPECIFIC (enumtype) = lt;
5951 /* Fix up all variant types of this enum type. */
5952 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5954 if (tem == enumtype)
5956 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5957 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5958 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5959 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5960 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5961 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5962 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5963 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5964 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5965 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5966 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5969 /* Finish debugging output for this type. */
5970 rest_of_type_compilation (enumtype, toplevel);
5975 /* Build and install a CONST_DECL for one value of the
5976 current enumeration type (one that was begun with start_enum).
5977 Return a tree-list containing the CONST_DECL and its value.
5978 Assignment of sequential values by default is handled here. */
5981 build_enumerator (struct c_enum_contents *the_enum, tree name, tree value)
5985 /* Validate and default VALUE. */
5989 /* Don't issue more errors for error_mark_node (i.e. an
5990 undeclared identifier) - just ignore the value expression. */
5991 if (value == error_mark_node)
5993 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5994 || TREE_CODE (value) != INTEGER_CST)
5996 error ("enumerator value for %qE is not an integer constant", name);
6001 value = default_conversion (value);
6002 constant_expression_warning (value);
6006 /* Default based on previous value. */
6007 /* It should no longer be possible to have NON_LVALUE_EXPR
6011 value = the_enum->enum_next_value;
6012 if (the_enum->enum_overflow)
6013 error ("overflow in enumeration values");
6016 if (pedantic && !int_fits_type_p (value, integer_type_node))
6018 pedwarn (OPT_pedantic, "ISO C restricts enumerator values to range of %<int%>");
6019 /* XXX This causes -pedantic to change the meaning of the program.
6020 Remove? -zw 2004-03-15 */
6021 value = convert (integer_type_node, value);
6024 /* Set basis for default for next value. */
6025 the_enum->enum_next_value = build_binary_op (PLUS_EXPR, value,
6026 integer_one_node, 0);
6027 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
6029 /* Now create a declaration for the enum value name. */
6031 type = TREE_TYPE (value);
6032 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
6033 TYPE_PRECISION (integer_type_node)),
6034 (TYPE_PRECISION (type)
6035 >= TYPE_PRECISION (integer_type_node)
6036 && TYPE_UNSIGNED (type)));
6038 decl = build_decl (CONST_DECL, name, type);
6039 DECL_INITIAL (decl) = convert (type, value);
6042 return tree_cons (decl, value, NULL_TREE);
6046 /* Create the FUNCTION_DECL for a function definition.
6047 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6048 the declaration; they describe the function's name and the type it returns,
6049 but twisted together in a fashion that parallels the syntax of C.
6051 This function creates a binding context for the function body
6052 as well as setting up the FUNCTION_DECL in current_function_decl.
6054 Returns 1 on success. If the DECLARATOR is not suitable for a function
6055 (it defines a datum instead), we return 0, which tells
6056 yyparse to report a parse error. */
6059 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
6062 tree decl1, old_decl;
6063 tree restype, resdecl;
6064 struct c_label_context_se *nstack_se;
6065 struct c_label_context_vm *nstack_vm;
6067 current_function_returns_value = 0; /* Assume, until we see it does. */
6068 current_function_returns_null = 0;
6069 current_function_returns_abnormally = 0;
6070 warn_about_return_type = 0;
6071 c_switch_stack = NULL;
6073 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
6074 nstack_se->labels_def = NULL;
6075 nstack_se->labels_used = NULL;
6076 nstack_se->next = label_context_stack_se;
6077 label_context_stack_se = nstack_se;
6079 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
6080 nstack_vm->labels_def = NULL;
6081 nstack_vm->labels_used = NULL;
6082 nstack_vm->scope = 0;
6083 nstack_vm->next = label_context_stack_vm;
6084 label_context_stack_vm = nstack_vm;
6086 /* Indicate no valid break/continue context by setting these variables
6087 to some non-null, non-label value. We'll notice and emit the proper
6088 error message in c_finish_bc_stmt. */
6089 c_break_label = c_cont_label = size_zero_node;
6091 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
6092 &attributes, DEPRECATED_NORMAL);
6094 /* If the declarator is not suitable for a function definition,
6095 cause a syntax error. */
6098 label_context_stack_se = label_context_stack_se->next;
6099 label_context_stack_vm = label_context_stack_vm->next;
6103 decl_attributes (&decl1, attributes, 0);
6105 if (DECL_DECLARED_INLINE_P (decl1)
6106 && DECL_UNINLINABLE (decl1)
6107 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6108 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
6111 /* Handle gnu_inline attribute. */
6112 if (declspecs->inline_p
6113 && !flag_gnu89_inline
6114 && TREE_CODE (decl1) == FUNCTION_DECL
6115 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
6116 || current_function_decl))
6118 if (declspecs->storage_class != csc_static)
6119 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
6122 announce_function (decl1);
6124 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6126 error ("return type is an incomplete type");
6127 /* Make it return void instead. */
6129 = build_function_type (void_type_node,
6130 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6133 if (warn_about_return_type)
6134 pedwarn_c99 (flag_isoc99 ? 0
6135 : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
6136 "return type defaults to %<int%>");
6138 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6139 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6140 DECL_INITIAL (decl1) = error_mark_node;
6142 /* If this definition isn't a prototype and we had a prototype declaration
6143 before, copy the arg type info from that prototype. */
6144 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
6145 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
6147 current_function_prototype_locus = UNKNOWN_LOCATION;
6148 current_function_prototype_built_in = false;
6149 current_function_prototype_arg_types = NULL_TREE;
6150 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6152 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6153 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6154 TREE_TYPE (TREE_TYPE (old_decl))))
6156 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
6158 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
6159 current_function_prototype_built_in
6160 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
6161 current_function_prototype_arg_types
6162 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
6164 if (TREE_PUBLIC (decl1))
6166 /* If there is an external prototype declaration of this
6167 function, record its location but do not copy information
6168 to this decl. This may be an invisible declaration
6169 (built-in or in a scope which has finished) or simply
6170 have more refined argument types than any declaration
6172 struct c_binding *b;
6173 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
6174 if (B_IN_SCOPE (b, external_scope))
6178 tree ext_decl, ext_type;
6180 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
6181 if (TREE_CODE (ext_type) == FUNCTION_TYPE
6182 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6183 TREE_TYPE (ext_type)))
6185 current_function_prototype_locus
6186 = DECL_SOURCE_LOCATION (ext_decl);
6187 current_function_prototype_built_in
6188 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
6189 current_function_prototype_arg_types
6190 = TYPE_ARG_TYPES (ext_type);
6196 /* Optionally warn of old-fashioned def with no previous prototype. */
6197 if (warn_strict_prototypes
6198 && old_decl != error_mark_node
6199 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6200 && C_DECL_ISNT_PROTOTYPE (old_decl))
6201 warning (OPT_Wstrict_prototypes,
6202 "function declaration isn%'t a prototype");
6203 /* Optionally warn of any global def with no previous prototype. */
6204 else if (warn_missing_prototypes
6205 && old_decl != error_mark_node
6206 && TREE_PUBLIC (decl1)
6207 && !MAIN_NAME_P (DECL_NAME (decl1))
6208 && C_DECL_ISNT_PROTOTYPE (old_decl))
6209 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
6210 /* Optionally warn of any def with no previous prototype
6211 if the function has already been used. */
6212 else if (warn_missing_prototypes
6214 && old_decl != error_mark_node
6215 && TREE_USED (old_decl)
6216 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6217 warning (OPT_Wmissing_prototypes,
6218 "%q+D was used with no prototype before its definition", decl1);
6219 /* Optionally warn of any global def with no previous declaration. */
6220 else if (warn_missing_declarations
6221 && TREE_PUBLIC (decl1)
6223 && !MAIN_NAME_P (DECL_NAME (decl1)))
6224 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
6226 /* Optionally warn of any def with no previous declaration
6227 if the function has already been used. */
6228 else if (warn_missing_declarations
6230 && old_decl != error_mark_node
6231 && TREE_USED (old_decl)
6232 && C_DECL_IMPLICIT (old_decl))
6233 warning (OPT_Wmissing_declarations,
6234 "%q+D was used with no declaration before its definition", decl1);
6236 /* This function exists in static storage.
6237 (This does not mean `static' in the C sense!) */
6238 TREE_STATIC (decl1) = 1;
6240 /* A nested function is not global. */
6241 if (current_function_decl != 0)
6242 TREE_PUBLIC (decl1) = 0;
6244 /* This is the earliest point at which we might know the assembler
6245 name of the function. Thus, if it's set before this, die horribly. */
6246 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
6248 /* If #pragma weak was used, mark the decl weak now. */
6249 if (current_scope == file_scope)
6250 maybe_apply_pragma_weak (decl1);
6252 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6253 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6255 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6256 != integer_type_node)
6257 pedwarn (OPT_Wmain, "return type of %q+D is not %<int%>", decl1);
6259 check_main_parameter_types(decl1);
6261 if (!TREE_PUBLIC (decl1))
6262 pedwarn (OPT_Wmain, "%q+D is normally a non-static function", decl1);
6265 /* Record the decl so that the function name is defined.
6266 If we already have a decl for this name, and it is a FUNCTION_DECL,
6267 use the old decl. */
6269 current_function_decl = pushdecl (decl1);
6272 declare_parm_level ();
6274 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6275 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6276 DECL_ARTIFICIAL (resdecl) = 1;
6277 DECL_IGNORED_P (resdecl) = 1;
6278 DECL_RESULT (current_function_decl) = resdecl;
6280 start_fname_decls ();
6285 /* Subroutine of store_parm_decls which handles new-style function
6286 definitions (prototype format). The parms already have decls, so we
6287 need only record them as in effect and complain if any redundant
6288 old-style parm decls were written. */
6290 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6294 if (current_scope->bindings)
6296 error ("%Jold-style parameter declarations in prototyped "
6297 "function definition", fndecl);
6299 /* Get rid of the old-style declarations. */
6303 /* Don't issue this warning for nested functions, and don't issue this
6304 warning if we got here because ARG_INFO_TYPES was error_mark_node
6305 (this happens when a function definition has just an ellipsis in
6306 its parameter list). */
6307 else if (!in_system_header && !current_function_scope
6308 && arg_info->types != error_mark_node)
6309 warning (OPT_Wtraditional,
6310 "%Jtraditional C rejects ISO C style function definitions",
6313 /* Now make all the parameter declarations visible in the function body.
6314 We can bypass most of the grunt work of pushdecl. */
6315 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6317 DECL_CONTEXT (decl) = current_function_decl;
6318 if (DECL_NAME (decl))
6320 bind (DECL_NAME (decl), decl, current_scope,
6321 /*invisible=*/false, /*nested=*/false);
6322 if (!TREE_USED (decl))
6323 warn_if_shadowing (decl);
6326 error ("%Jparameter name omitted", decl);
6329 /* Record the parameter list in the function declaration. */
6330 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6332 /* Now make all the ancillary declarations visible, likewise. */
6333 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6335 DECL_CONTEXT (decl) = current_function_decl;
6336 if (DECL_NAME (decl))
6337 bind (DECL_NAME (decl), decl, current_scope,
6338 /*invisible=*/false, /*nested=*/false);
6341 /* And all the tag declarations. */
6342 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6343 if (TREE_PURPOSE (decl))
6344 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6345 /*invisible=*/false, /*nested=*/false);
6348 /* Subroutine of store_parm_decls which handles old-style function
6349 definitions (separate parameter list and declarations). */
6352 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6354 struct c_binding *b;
6355 tree parm, decl, last;
6356 tree parmids = arg_info->parms;
6357 struct pointer_set_t *seen_args = pointer_set_create ();
6359 if (!in_system_header)
6360 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6363 /* Match each formal parameter name with its declaration. Save each
6364 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6365 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6367 if (TREE_VALUE (parm) == 0)
6369 error ("%Jparameter name missing from parameter list", fndecl);
6370 TREE_PURPOSE (parm) = 0;
6374 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6375 if (b && B_IN_CURRENT_SCOPE (b))
6378 /* If we got something other than a PARM_DECL it is an error. */
6379 if (TREE_CODE (decl) != PARM_DECL)
6380 error ("%q+D declared as a non-parameter", decl);
6381 /* If the declaration is already marked, we have a duplicate
6382 name. Complain and ignore the duplicate. */
6383 else if (pointer_set_contains (seen_args, decl))
6385 error ("multiple parameters named %q+D", decl);
6386 TREE_PURPOSE (parm) = 0;
6389 /* If the declaration says "void", complain and turn it into
6391 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6393 error ("parameter %q+D declared with void type", decl);
6394 TREE_TYPE (decl) = integer_type_node;
6395 DECL_ARG_TYPE (decl) = integer_type_node;
6396 layout_decl (decl, 0);
6398 warn_if_shadowing (decl);
6400 /* If no declaration found, default to int. */
6403 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6404 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6405 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6407 warn_if_shadowing (decl);
6410 pedwarn (0, "type of %q+D defaults to %<int%>", decl);
6412 warning (OPT_Wmissing_parameter_type, "type of %q+D defaults to %<int%>", decl);
6415 TREE_PURPOSE (parm) = decl;
6416 pointer_set_insert (seen_args, decl);
6419 /* Now examine the parms chain for incomplete declarations
6420 and declarations with no corresponding names. */
6422 for (b = current_scope->bindings; b; b = b->prev)
6425 if (TREE_CODE (parm) != PARM_DECL)
6428 if (TREE_TYPE (parm) != error_mark_node
6429 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6431 error ("parameter %q+D has incomplete type", parm);
6432 TREE_TYPE (parm) = error_mark_node;
6435 if (!pointer_set_contains (seen_args, parm))
6437 error ("declaration for parameter %q+D but no such parameter", parm);
6439 /* Pretend the parameter was not missing.
6440 This gets us to a standard state and minimizes
6441 further error messages. */
6442 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6446 /* Chain the declarations together in the order of the list of
6447 names. Store that chain in the function decl, replacing the
6448 list of names. Update the current scope to match. */
6449 DECL_ARGUMENTS (fndecl) = 0;
6451 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6452 if (TREE_PURPOSE (parm))
6454 if (parm && TREE_PURPOSE (parm))
6456 last = TREE_PURPOSE (parm);
6457 DECL_ARGUMENTS (fndecl) = last;
6459 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6460 if (TREE_PURPOSE (parm))
6462 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6463 last = TREE_PURPOSE (parm);
6465 TREE_CHAIN (last) = 0;
6468 pointer_set_destroy (seen_args);
6470 /* If there was a previous prototype,
6471 set the DECL_ARG_TYPE of each argument according to
6472 the type previously specified, and report any mismatches. */
6474 if (current_function_prototype_arg_types)
6477 for (parm = DECL_ARGUMENTS (fndecl),
6478 type = current_function_prototype_arg_types;
6479 parm || (type && TREE_VALUE (type) != error_mark_node
6480 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
6481 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6483 if (parm == 0 || type == 0
6484 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6486 if (current_function_prototype_built_in)
6487 warning (0, "number of arguments doesn%'t match "
6488 "built-in prototype");
6491 error ("number of arguments doesn%'t match prototype");
6492 error ("%Hprototype declaration",
6493 ¤t_function_prototype_locus);
6497 /* Type for passing arg must be consistent with that
6498 declared for the arg. ISO C says we take the unqualified
6499 type for parameters declared with qualified type. */
6500 if (TREE_TYPE (parm) != error_mark_node
6501 && TREE_TYPE (type) != error_mark_node
6502 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6503 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6505 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6506 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6508 /* Adjust argument to match prototype. E.g. a previous
6509 `int foo(float);' prototype causes
6510 `int foo(x) float x; {...}' to be treated like
6511 `int foo(float x) {...}'. This is particularly
6512 useful for argument types like uid_t. */
6513 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6515 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6516 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6517 && TYPE_PRECISION (TREE_TYPE (parm))
6518 < TYPE_PRECISION (integer_type_node))
6519 DECL_ARG_TYPE (parm) = integer_type_node;
6521 /* ??? Is it possible to get here with a
6522 built-in prototype or will it always have
6523 been diagnosed as conflicting with an
6524 old-style definition and discarded? */
6525 if (current_function_prototype_built_in)
6526 warning (OPT_pedantic, "promoted argument %qD "
6527 "doesn%'t match built-in prototype", parm);
6530 pedwarn (OPT_pedantic, "promoted argument %qD "
6531 "doesn%'t match prototype", parm);
6532 pedwarn (OPT_pedantic, "%Hprototype declaration",
6533 ¤t_function_prototype_locus);
6538 if (current_function_prototype_built_in)
6539 warning (0, "argument %qD doesn%'t match "
6540 "built-in prototype", parm);
6543 error ("argument %qD doesn%'t match prototype", parm);
6544 error ("%Hprototype declaration",
6545 ¤t_function_prototype_locus);
6550 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6553 /* Otherwise, create a prototype that would match. */
6557 tree actual = 0, last = 0, type;
6559 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6561 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6563 TREE_CHAIN (last) = type;
6568 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6570 TREE_CHAIN (last) = type;
6574 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6575 of the type of this function, but we need to avoid having this
6576 affect the types of other similarly-typed functions, so we must
6577 first force the generation of an identical (but separate) type
6578 node for the relevant function type. The new node we create
6579 will be a variant of the main variant of the original function
6582 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6584 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6588 /* Store parameter declarations passed in ARG_INFO into the current
6589 function declaration. */
6592 store_parm_decls_from (struct c_arg_info *arg_info)
6594 current_function_arg_info = arg_info;
6595 store_parm_decls ();
6598 /* Store the parameter declarations into the current function declaration.
6599 This is called after parsing the parameter declarations, before
6600 digesting the body of the function.
6602 For an old-style definition, construct a prototype out of the old-style
6603 parameter declarations and inject it into the function's type. */
6606 store_parm_decls (void)
6608 tree fndecl = current_function_decl;
6611 /* The argument information block for FNDECL. */
6612 struct c_arg_info *arg_info = current_function_arg_info;
6613 current_function_arg_info = 0;
6615 /* True if this definition is written with a prototype. Note:
6616 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6617 list in a function definition as equivalent to (void) -- an
6618 empty argument list specifies the function has no parameters,
6619 but only (void) sets up a prototype for future calls. */
6620 proto = arg_info->types != 0;
6623 store_parm_decls_newstyle (fndecl, arg_info);
6625 store_parm_decls_oldstyle (fndecl, arg_info);
6627 /* The next call to push_scope will be a function body. */
6629 next_is_function_body = true;
6631 /* Write a record describing this function definition to the prototypes
6632 file (if requested). */
6634 gen_aux_info_record (fndecl, 1, 0, proto);
6636 /* Initialize the RTL code for the function. */
6637 allocate_struct_function (fndecl, false);
6639 /* Begin the statement tree for this function. */
6640 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6642 /* ??? Insert the contents of the pending sizes list into the function
6643 to be evaluated. The only reason left to have this is
6644 void foo(int n, int array[n++])
6645 because we throw away the array type in favor of a pointer type, and
6646 thus won't naturally see the SAVE_EXPR containing the increment. All
6647 other pending sizes would be handled by gimplify_parameters. */
6650 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6651 add_stmt (TREE_VALUE (t));
6654 /* Even though we're inside a function body, we still don't want to
6655 call expand_expr to calculate the size of a variable-sized array.
6656 We haven't necessarily assigned RTL to all variables yet, so it's
6657 not safe to try to expand expressions involving them. */
6658 cfun->dont_save_pending_sizes_p = 1;
6661 /* Emit diagnostics that require gimple input for detection. Operate on
6662 FNDECL and all its nested functions. */
6665 c_gimple_diagnostics_recursively (tree fndecl)
6667 struct cgraph_node *cgn;
6669 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6670 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6672 /* Notice when OpenMP structured block constraints are violated. */
6674 diagnose_omp_structured_block_errors (fndecl);
6676 /* Finalize all nested functions now. */
6677 cgn = cgraph_node (fndecl);
6678 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6679 c_gimple_diagnostics_recursively (cgn->decl);
6682 /* Finish up a function declaration and compile that function
6683 all the way to assembler language output. The free the storage
6684 for the function definition.
6686 This is called after parsing the body of the function definition. */
6689 finish_function (void)
6691 tree fndecl = current_function_decl;
6693 label_context_stack_se = label_context_stack_se->next;
6694 label_context_stack_vm = label_context_stack_vm->next;
6696 if (TREE_CODE (fndecl) == FUNCTION_DECL
6697 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6699 tree args = DECL_ARGUMENTS (fndecl);
6700 for (; args; args = TREE_CHAIN (args))
6702 tree type = TREE_TYPE (args);
6703 if (INTEGRAL_TYPE_P (type)
6704 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6705 DECL_ARG_TYPE (args) = integer_type_node;
6709 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6710 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6712 /* Must mark the RESULT_DECL as being in this function. */
6714 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6715 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6717 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6719 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6720 != integer_type_node)
6722 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6723 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6725 pedwarn (0, "return type of %q+D is not %<int%>", fndecl);
6731 tree stmt = c_finish_return (integer_zero_node);
6732 /* Hack. We don't want the middle-end to warn that this return
6733 is unreachable, so we mark its location as special. Using
6734 UNKNOWN_LOCATION has the problem that it gets clobbered in
6735 annotate_one_with_locus. A cleaner solution might be to
6736 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6738 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6743 /* Tie off the statement tree for this function. */
6744 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6746 finish_fname_decls ();
6748 /* Complain if there's just no return statement. */
6749 if (warn_return_type
6750 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6751 && !current_function_returns_value && !current_function_returns_null
6752 /* Don't complain if we are no-return. */
6753 && !current_function_returns_abnormally
6754 /* Don't warn for main(). */
6755 && !MAIN_NAME_P (DECL_NAME (fndecl))
6756 /* Or if they didn't actually specify a return type. */
6757 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6758 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6759 inline function, as we might never be compiled separately. */
6760 && DECL_INLINE (fndecl))
6762 warning (OPT_Wreturn_type,
6763 "no return statement in function returning non-void");
6764 TREE_NO_WARNING (fndecl) = 1;
6767 /* Store the end of the function, so that we get good line number
6768 info for the epilogue. */
6769 cfun->function_end_locus = input_location;
6771 /* Finalize the ELF visibility for the function. */
6772 c_determine_visibility (fndecl);
6774 /* For GNU C extern inline functions disregard inline limits. */
6775 if (DECL_EXTERNAL (fndecl)
6776 && DECL_DECLARED_INLINE_P (fndecl))
6777 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
6779 /* Genericize before inlining. Delay genericizing nested functions
6780 until their parent function is genericized. Since finalizing
6781 requires GENERIC, delay that as well. */
6783 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6784 && !undef_nested_function)
6786 if (!decl_function_context (fndecl))
6788 c_genericize (fndecl);
6789 c_gimple_diagnostics_recursively (fndecl);
6791 /* ??? Objc emits functions after finalizing the compilation unit.
6792 This should be cleaned up later and this conditional removed. */
6793 if (cgraph_global_info_ready)
6795 cgraph_add_new_function (fndecl, false);
6799 cgraph_finalize_function (fndecl, false);
6803 /* Register this function with cgraph just far enough to get it
6804 added to our parent's nested function list. Handy, since the
6805 C front end doesn't have such a list. */
6806 (void) cgraph_node (fndecl);
6810 if (!decl_function_context (fndecl))
6811 undef_nested_function = false;
6813 /* We're leaving the context of this function, so zap cfun.
6814 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6815 tree_rest_of_compilation. */
6817 current_function_decl = NULL;
6820 /* Check the declarations given in a for-loop for satisfying the C99
6821 constraints. If exactly one such decl is found, return it. */
6824 check_for_loop_decls (void)
6826 struct c_binding *b;
6827 tree one_decl = NULL_TREE;
6833 /* If we get here, declarations have been used in a for loop without
6834 the C99 for loop scope. This doesn't make much sense, so don't
6836 error ("%<for%> loop initial declaration used outside C99 mode");
6839 /* C99 subclause 6.8.5 paragraph 3:
6841 [#3] The declaration part of a for statement shall only
6842 declare identifiers for objects having storage class auto or
6845 It isn't clear whether, in this sentence, "identifiers" binds to
6846 "shall only declare" or to "objects" - that is, whether all identifiers
6847 declared must be identifiers for objects, or whether the restriction
6848 only applies to those that are. (A question on this in comp.std.c
6849 in November 2000 received no answer.) We implement the strictest
6850 interpretation, to avoid creating an extension which later causes
6853 for (b = current_scope->bindings; b; b = b->prev)
6856 tree decl = b->decl;
6861 switch (TREE_CODE (decl))
6864 if (TREE_STATIC (decl))
6865 error ("declaration of static variable %q+D in %<for%> loop "
6866 "initial declaration", decl);
6867 else if (DECL_EXTERNAL (decl))
6868 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6869 "initial declaration", decl);
6873 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6877 error ("%<union %E%> declared in %<for%> loop initial declaration",
6881 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6885 error ("declaration of non-variable %q+D in %<for%> loop "
6886 "initial declaration", decl);
6893 return n_decls == 1 ? one_decl : NULL_TREE;
6896 /* Save and reinitialize the variables
6897 used during compilation of a C function. */
6900 c_push_function_context (void)
6902 struct language_function *p;
6903 p = GGC_NEW (struct language_function);
6906 p->base.x_stmt_tree = c_stmt_tree;
6907 p->x_break_label = c_break_label;
6908 p->x_cont_label = c_cont_label;
6909 p->x_switch_stack = c_switch_stack;
6910 p->arg_info = current_function_arg_info;
6911 p->returns_value = current_function_returns_value;
6912 p->returns_null = current_function_returns_null;
6913 p->returns_abnormally = current_function_returns_abnormally;
6914 p->warn_about_return_type = warn_about_return_type;
6916 push_function_context ();
6919 /* Restore the variables used during compilation of a C function. */
6922 c_pop_function_context (void)
6924 struct language_function *p;
6926 pop_function_context ();
6928 cfun->language = NULL;
6930 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6931 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6933 /* Stop pointing to the local nodes about to be freed. */
6934 /* But DECL_INITIAL must remain nonzero so we know this
6935 was an actual function definition. */
6936 DECL_INITIAL (current_function_decl) = error_mark_node;
6937 DECL_ARGUMENTS (current_function_decl) = 0;
6940 c_stmt_tree = p->base.x_stmt_tree;
6941 c_break_label = p->x_break_label;
6942 c_cont_label = p->x_cont_label;
6943 c_switch_stack = p->x_switch_stack;
6944 current_function_arg_info = p->arg_info;
6945 current_function_returns_value = p->returns_value;
6946 current_function_returns_null = p->returns_null;
6947 current_function_returns_abnormally = p->returns_abnormally;
6948 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 && !flag_isoc99)
7177 pedwarn (OPT_pedantic, "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
7196 && C_IS_RESERVED_WORD (type)
7197 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
7199 enum rid i = C_RID_CODE (type);
7202 error ("two or more data types in declaration specifiers");
7205 if ((int) i <= (int) RID_LAST_MODIFIER)
7207 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
7212 if (specs->long_long_p)
7214 error ("%<long long long%> is too long for GCC");
7219 if (specs->typespec_word == cts_double)
7221 error ("both %<long long%> and %<double%> in "
7222 "declaration specifiers");
7225 if (pedantic && !flag_isoc99 && !in_system_header)
7226 pedwarn (OPT_Wlong_long, "ISO C90 does not support %<long long%>");
7227 specs->long_long_p = 1;
7231 error ("both %<long%> and %<short%> in "
7232 "declaration specifiers");
7233 else if (specs->typespec_word == cts_void)
7234 error ("both %<long%> and %<void%> in "
7235 "declaration specifiers");
7236 else if (specs->typespec_word == cts_bool)
7237 error ("both %<long%> and %<_Bool%> in "
7238 "declaration specifiers");
7239 else if (specs->typespec_word == cts_char)
7240 error ("both %<long%> and %<char%> in "
7241 "declaration specifiers");
7242 else if (specs->typespec_word == cts_float)
7243 error ("both %<long%> and %<float%> in "
7244 "declaration specifiers");
7245 else if (specs->typespec_word == cts_dfloat32)
7246 error ("both %<long%> and %<_Decimal32%> in "
7247 "declaration specifiers");
7248 else if (specs->typespec_word == cts_dfloat64)
7249 error ("both %<long%> and %<_Decimal64%> in "
7250 "declaration specifiers");
7251 else if (specs->typespec_word == cts_dfloat128)
7252 error ("both %<long%> and %<_Decimal128%> in "
7253 "declaration specifiers");
7255 specs->long_p = true;
7258 dupe = specs->short_p;
7260 error ("both %<long%> and %<short%> in "
7261 "declaration specifiers");
7262 else if (specs->typespec_word == cts_void)
7263 error ("both %<short%> and %<void%> in "
7264 "declaration specifiers");
7265 else if (specs->typespec_word == cts_bool)
7266 error ("both %<short%> and %<_Bool%> in "
7267 "declaration specifiers");
7268 else if (specs->typespec_word == cts_char)
7269 error ("both %<short%> and %<char%> in "
7270 "declaration specifiers");
7271 else if (specs->typespec_word == cts_float)
7272 error ("both %<short%> and %<float%> in "
7273 "declaration specifiers");
7274 else if (specs->typespec_word == cts_double)
7275 error ("both %<short%> and %<double%> in "
7276 "declaration specifiers");
7277 else if (specs->typespec_word == cts_dfloat32)
7278 error ("both %<short%> and %<_Decimal32%> in "
7279 "declaration specifiers");
7280 else if (specs->typespec_word == cts_dfloat64)
7281 error ("both %<short%> and %<_Decimal64%> in "
7282 "declaration specifiers");
7283 else if (specs->typespec_word == cts_dfloat128)
7284 error ("both %<short%> and %<_Decimal128%> in "
7285 "declaration specifiers");
7287 specs->short_p = true;
7290 dupe = specs->signed_p;
7291 if (specs->unsigned_p)
7292 error ("both %<signed%> and %<unsigned%> in "
7293 "declaration specifiers");
7294 else if (specs->typespec_word == cts_void)
7295 error ("both %<signed%> and %<void%> in "
7296 "declaration specifiers");
7297 else if (specs->typespec_word == cts_bool)
7298 error ("both %<signed%> and %<_Bool%> in "
7299 "declaration specifiers");
7300 else if (specs->typespec_word == cts_float)
7301 error ("both %<signed%> and %<float%> in "
7302 "declaration specifiers");
7303 else if (specs->typespec_word == cts_double)
7304 error ("both %<signed%> and %<double%> in "
7305 "declaration specifiers");
7306 else if (specs->typespec_word == cts_dfloat32)
7307 error ("both %<signed%> and %<_Decimal32%> in "
7308 "declaration specifiers");
7309 else if (specs->typespec_word == cts_dfloat64)
7310 error ("both %<signed%> and %<_Decimal64%> in "
7311 "declaration specifiers");
7312 else if (specs->typespec_word == cts_dfloat128)
7313 error ("both %<signed%> and %<_Decimal128%> in "
7314 "declaration specifiers");
7316 specs->signed_p = true;
7319 dupe = specs->unsigned_p;
7320 if (specs->signed_p)
7321 error ("both %<signed%> and %<unsigned%> in "
7322 "declaration specifiers");
7323 else if (specs->typespec_word == cts_void)
7324 error ("both %<unsigned%> and %<void%> in "
7325 "declaration specifiers");
7326 else if (specs->typespec_word == cts_bool)
7327 error ("both %<unsigned%> and %<_Bool%> in "
7328 "declaration specifiers");
7329 else if (specs->typespec_word == cts_float)
7330 error ("both %<unsigned%> and %<float%> in "
7331 "declaration specifiers");
7332 else if (specs->typespec_word == cts_double)
7333 error ("both %<unsigned%> and %<double%> in "
7334 "declaration specifiers");
7335 else if (specs->typespec_word == cts_dfloat32)
7336 error ("both %<unsigned%> and %<_Decimal32%> in "
7337 "declaration specifiers");
7338 else if (specs->typespec_word == cts_dfloat64)
7339 error ("both %<unsigned%> and %<_Decimal64%> in "
7340 "declaration specifiers");
7341 else if (specs->typespec_word == cts_dfloat128)
7342 error ("both %<unsigned%> and %<_Decimal128%> in "
7343 "declaration specifiers");
7345 specs->unsigned_p = true;
7348 dupe = specs->complex_p;
7349 if (!flag_isoc99 && !in_system_header)
7350 pedwarn (OPT_pedantic, "ISO C90 does not support complex types");
7351 if (specs->typespec_word == cts_void)
7352 error ("both %<complex%> and %<void%> in "
7353 "declaration specifiers");
7354 else if (specs->typespec_word == cts_bool)
7355 error ("both %<complex%> and %<_Bool%> in "
7356 "declaration specifiers");
7357 else if (specs->typespec_word == cts_dfloat32)
7358 error ("both %<complex%> and %<_Decimal32%> in "
7359 "declaration specifiers");
7360 else if (specs->typespec_word == cts_dfloat64)
7361 error ("both %<complex%> and %<_Decimal64%> in "
7362 "declaration specifiers");
7363 else if (specs->typespec_word == cts_dfloat128)
7364 error ("both %<complex%> and %<_Decimal128%> in "
7365 "declaration specifiers");
7366 else if (specs->typespec_word == cts_fract)
7367 error ("both %<complex%> and %<_Fract%> in "
7368 "declaration specifiers");
7369 else if (specs->typespec_word == cts_accum)
7370 error ("both %<complex%> and %<_Accum%> in "
7371 "declaration specifiers");
7372 else if (specs->saturating_p)
7373 error ("both %<complex%> and %<_Sat%> in "
7374 "declaration specifiers");
7376 specs->complex_p = true;
7379 dupe = specs->saturating_p;
7380 pedwarn (OPT_pedantic, "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");
7577 pedwarn (OPT_pedantic,
7578 "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");
7598 pedwarn (OPT_pedantic,
7599 "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;
7785 pedwarn (OPT_pedantic,
7786 "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)
7830 pedwarn (OPT_pedantic,
7831 "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)
7856 pedwarn (OPT_pedantic,
7857 "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 (0, "%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"