1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
36 #include "tree-inline.h"
53 #include "langhooks.h"
54 #include "tree-mudflap.h"
55 #include "tree-gimple.h"
56 #include "diagnostic.h"
57 #include "tree-dump.h"
62 #include "langhooks-def.h"
64 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
66 { NORMAL, /* Ordinary declaration */
67 FUNCDEF, /* Function definition */
68 PARM, /* Declaration of parm before function body */
69 FIELD, /* Declaration inside struct or union */
70 TYPENAME}; /* Typename (inside cast or sizeof) */
73 /* Nonzero if we have seen an invalid cross reference
74 to a struct, union, or enum, but not yet printed the message. */
75 tree pending_invalid_xref;
77 /* File and line to appear in the eventual error message. */
78 location_t pending_invalid_xref_location;
80 /* True means we've initialized exception handling. */
81 bool c_eh_initialized_p;
83 /* While defining an enum type, this is 1 plus the last enumerator
84 constant value. Note that will do not have to save this or `enum_overflow'
85 around nested function definition since such a definition could only
86 occur in an enum value expression and we don't use these variables in
89 static tree enum_next_value;
91 /* Nonzero means that there was overflow computing enum_next_value. */
93 static int enum_overflow;
95 /* The file and line that the prototype came from if this is an
96 old-style definition; used for diagnostics in
97 store_parm_decls_oldstyle. */
99 static location_t current_function_prototype_locus;
101 /* The argument information structure for the function currently being
104 static struct c_arg_info *current_function_arg_info;
106 /* The obstack on which parser and related data structures, which are
107 not live beyond their top-level declaration or definition, are
109 struct obstack parser_obstack;
111 /* The current statement tree. */
113 static GTY(()) struct stmt_tree_s c_stmt_tree;
115 /* State saving variables. */
119 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
120 included in this invocation. Note that the current translation
121 unit is not included in this list. */
123 static GTY(()) tree all_translation_units;
125 /* A list of decls to be made automatically visible in each file scope. */
126 static GTY(()) tree visible_builtins;
128 /* Set to 0 at beginning of a function definition, set to 1 if
129 a return statement that specifies a return value is seen. */
131 int current_function_returns_value;
133 /* Set to 0 at beginning of a function definition, set to 1 if
134 a return statement with no argument is seen. */
136 int current_function_returns_null;
138 /* Set to 0 at beginning of a function definition, set to 1 if
139 a call to a noreturn function is seen. */
141 int current_function_returns_abnormally;
143 /* Set to nonzero by `grokdeclarator' for a function
144 whose return type is defaulted, if warnings for this are desired. */
146 static int warn_about_return_type;
148 /* Nonzero when starting a function declared `extern inline'. */
150 static int current_extern_inline;
152 /* Nonzero when the current toplevel function contains a declaration
153 of a nested function which is never defined. */
155 static bool undef_nested_function;
157 /* True means global_bindings_p should return false even if the scope stack
158 says we are in file scope. */
159 bool c_override_global_bindings_to_false;
162 /* Each c_binding structure describes one binding of an identifier to
163 a decl. All the decls in a scope - irrespective of namespace - are
164 chained together by the ->prev field, which (as the name implies)
165 runs in reverse order. All the decls in a given namespace bound to
166 a given identifier are chained by the ->shadowed field, which runs
167 from inner to outer scopes.
169 The ->decl field usually points to a DECL node, but there are two
170 exceptions. In the namespace of type tags, the bound entity is a
171 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
172 identifier is encountered, it is bound to error_mark_node to
173 suppress further errors about that identifier in the current
176 The ->type field stores the type of the declaration in this scope;
177 if NULL, the type is the type of the ->decl field. This is only of
178 relevance for objects with external or internal linkage which may
179 be redeclared in inner scopes, forming composite types that only
180 persist for the duration of those scopes. In the external scope,
181 this stores the composite of all the types declared for this
182 object, visible or not. The ->inner_comp field (used only at file
183 scope) stores whether an incomplete array type at file scope was
184 completed at an inner scope to an array size other than 1.
186 The depth field is copied from the scope structure that holds this
187 decl. It is used to preserve the proper ordering of the ->shadowed
188 field (see bind()) and also for a handful of special-case checks.
189 Finally, the invisible bit is true for a decl which should be
190 ignored for purposes of normal name lookup, and the nested bit is
191 true for a decl that's been bound a second time in an inner scope;
192 in all such cases, the binding in the outer scope will have its
193 invisible bit true. */
195 struct c_binding GTY((chain_next ("%h.prev")))
197 tree decl; /* the decl bound */
198 tree type; /* the type in this scope */
199 tree id; /* the identifier it's bound to */
200 struct c_binding *prev; /* the previous decl in this scope */
201 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
202 unsigned int depth : 28; /* depth of this scope */
203 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
204 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
205 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
208 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
209 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
210 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
211 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
213 #define I_SYMBOL_BINDING(node) \
214 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
215 #define I_SYMBOL_DECL(node) \
216 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
218 #define I_TAG_BINDING(node) \
219 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
220 #define I_TAG_DECL(node) \
221 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
223 #define I_LABEL_BINDING(node) \
224 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
225 #define I_LABEL_DECL(node) \
226 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
228 /* Each C symbol points to three linked lists of c_binding structures.
229 These describe the values of the identifier in the three different
230 namespaces defined by the language. */
232 struct lang_identifier GTY(())
234 struct c_common_identifier common_id;
235 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
236 struct c_binding *tag_binding; /* struct/union/enum tags */
237 struct c_binding *label_binding; /* labels */
240 /* Validate c-lang.c's assumptions. */
241 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
242 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
244 /* The resulting tree type. */
247 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
248 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : (union lang_tree_node *) TREE_CHAIN (&%h.generic)")))
250 union tree_node GTY ((tag ("0"),
251 desc ("tree_node_structure (&%h)")))
253 struct lang_identifier GTY ((tag ("1"))) identifier;
256 /* Each c_scope structure describes the complete contents of one
257 scope. Four scopes are distinguished specially: the innermost or
258 current scope, the innermost function scope, the file scope (always
259 the second to outermost) and the outermost or external scope.
261 Most declarations are recorded in the current scope.
263 All normal label declarations are recorded in the innermost
264 function scope, as are bindings of undeclared identifiers to
265 error_mark_node. (GCC permits nested functions as an extension,
266 hence the 'innermost' qualifier.) Explicitly declared labels
267 (using the __label__ extension) appear in the current scope.
269 Being in the file scope (current_scope == file_scope) causes
270 special behavior in several places below. Also, under some
271 conditions the Objective-C front end records declarations in the
272 file scope even though that isn't the current scope.
274 All declarations with external linkage are recorded in the external
275 scope, even if they aren't visible there; this models the fact that
276 such declarations are visible to the entire program, and (with a
277 bit of cleverness, see pushdecl) allows diagnosis of some violations
278 of C99 6.2.2p7 and 6.2.7p2:
280 If, within the same translation unit, the same identifier appears
281 with both internal and external linkage, the behavior is
284 All declarations that refer to the same object or function shall
285 have compatible type; otherwise, the behavior is undefined.
287 Initially only the built-in declarations, which describe compiler
288 intrinsic functions plus a subset of the standard library, are in
291 The order of the blocks list matters, and it is frequently appended
292 to. To avoid having to walk all the way to the end of the list on
293 each insertion, or reverse the list later, we maintain a pointer to
294 the last list entry. (FIXME: It should be feasible to use a reversed
297 The bindings list is strictly in reverse order of declarations;
298 pop_scope relies on this. */
301 struct c_scope GTY((chain_next ("%h.outer")))
303 /* The scope containing this one. */
304 struct c_scope *outer;
306 /* The next outermost function scope. */
307 struct c_scope *outer_function;
309 /* All bindings in this scope. */
310 struct c_binding *bindings;
312 /* For each scope (except the global one), a chain of BLOCK nodes
313 for all the scopes that were entered and exited one level down. */
317 /* The depth of this scope. Used to keep the ->shadowed chain of
318 bindings sorted innermost to outermost. */
319 unsigned int depth : 28;
321 /* True if we are currently filling this scope with parameter
323 BOOL_BITFIELD parm_flag : 1;
325 /* True if we already complained about forward parameter decls
326 in this scope. This prevents double warnings on
327 foo (int a; int b; ...) */
328 BOOL_BITFIELD warned_forward_parm_decls : 1;
330 /* True if this is the outermost block scope of a function body.
331 This scope contains the parameters, the local variables declared
332 in the outermost block, and all the labels (except those in
333 nested functions, or declared at block scope with __label__). */
334 BOOL_BITFIELD function_body : 1;
336 /* True means make a BLOCK for this scope no matter what. */
337 BOOL_BITFIELD keep : 1;
340 /* The scope currently in effect. */
342 static GTY(()) struct c_scope *current_scope;
344 /* The innermost function scope. Ordinary (not explicitly declared)
345 labels, bindings to error_mark_node, and the lazily-created
346 bindings of __func__ and its friends get this scope. */
348 static GTY(()) struct c_scope *current_function_scope;
350 /* The C file scope. This is reset for each input translation unit. */
352 static GTY(()) struct c_scope *file_scope;
354 /* The outermost scope. This is used for all declarations with
355 external linkage, and only these, hence the name. */
357 static GTY(()) struct c_scope *external_scope;
359 /* A chain of c_scope structures awaiting reuse. */
361 static GTY((deletable)) struct c_scope *scope_freelist;
363 /* A chain of c_binding structures awaiting reuse. */
365 static GTY((deletable)) struct c_binding *binding_freelist;
367 /* Append VAR to LIST in scope SCOPE. */
368 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
369 struct c_scope *s_ = (scope); \
371 if (s_->list##_last) \
372 TREE_CHAIN (s_->list##_last) = d_; \
375 s_->list##_last = d_; \
378 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
379 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
380 struct c_scope *t_ = (tscope); \
381 struct c_scope *f_ = (fscope); \
383 TREE_CHAIN (t_->to##_last) = f_->from; \
386 t_->to##_last = f_->from##_last; \
389 /* True means unconditionally make a BLOCK for the next scope pushed. */
391 static bool keep_next_level_flag;
393 /* True means the next call to push_scope will be the outermost scope
394 of a function body, so do not push a new scope, merely cease
395 expecting parameter decls. */
397 static bool next_is_function_body;
399 /* Functions called automatically at the beginning and end of execution. */
401 static GTY(()) tree static_ctors;
402 static GTY(()) tree static_dtors;
404 /* Forward declarations. */
405 static tree lookup_name_in_scope (tree, struct c_scope *);
406 static tree c_make_fname_decl (tree, int);
407 static tree grokdeclarator (const struct c_declarator *,
408 struct c_declspecs *,
409 enum decl_context, bool, tree *);
410 static tree grokparms (struct c_arg_info *, bool);
411 static void layout_array_type (tree);
413 /* States indicating how grokdeclarator() should handle declspecs marked
414 with __attribute__((deprecated)). An object declared as
415 __attribute__((deprecated)) suppresses warnings of uses of other
418 enum deprecated_states {
423 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
426 c_print_identifier (FILE *file, tree node, int indent)
428 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
429 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
430 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
431 if (C_IS_RESERVED_WORD (node))
433 tree rid = ridpointers[C_RID_CODE (node)];
434 indent_to (file, indent + 4);
435 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
436 (void *) rid, IDENTIFIER_POINTER (rid));
440 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
441 which may be any of several kinds of DECL or TYPE or error_mark_node,
442 in the scope SCOPE. */
444 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
446 struct c_binding *b, **here;
448 if (binding_freelist)
450 b = binding_freelist;
451 binding_freelist = b->prev;
454 b = GGC_NEW (struct c_binding);
459 b->depth = scope->depth;
460 b->invisible = invisible;
466 b->prev = scope->bindings;
472 switch (TREE_CODE (decl))
474 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
477 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
483 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
489 /* Locate the appropriate place in the chain of shadowed decls
490 to insert this binding. Normally, scope == current_scope and
491 this does nothing. */
492 while (*here && (*here)->depth > scope->depth)
493 here = &(*here)->shadowed;
499 /* Clear the binding structure B, stick it on the binding_freelist,
500 and return the former value of b->prev. This is used by pop_scope
501 and get_parm_info to iterate destructively over all the bindings
502 from a given scope. */
503 static struct c_binding *
504 free_binding_and_advance (struct c_binding *b)
506 struct c_binding *prev = b->prev;
508 memset (b, 0, sizeof (struct c_binding));
509 b->prev = binding_freelist;
510 binding_freelist = b;
516 /* Hook called at end of compilation to assume 1 elt
517 for a file-scope tentative array defn that wasn't complete before. */
520 c_finish_incomplete_decl (tree decl)
522 if (TREE_CODE (decl) == VAR_DECL)
524 tree type = TREE_TYPE (decl);
525 if (type != error_mark_node
526 && TREE_CODE (type) == ARRAY_TYPE
527 && !DECL_EXTERNAL (decl)
528 && TYPE_DOMAIN (type) == 0)
530 warning ("%Jarray %qD assumed to have one element", decl, decl);
532 complete_array_type (type, NULL_TREE, 1);
534 layout_decl (decl, 0);
539 /* The Objective-C front-end often needs to determine the current scope. */
542 objc_get_current_scope (void)
544 return current_scope;
547 /* The following function is used only by Objective-C. It needs to live here
548 because it accesses the innards of c_scope. */
551 objc_mark_locals_volatile (void *enclosing_blk)
553 struct c_scope *scope;
556 for (scope = current_scope;
557 scope && scope != enclosing_blk;
558 scope = scope->outer)
560 for (b = scope->bindings; b; b = b->prev)
562 if (TREE_CODE (b->decl) == VAR_DECL
563 || TREE_CODE (b->decl) == PARM_DECL)
565 C_DECL_REGISTER (b->decl) = 0;
566 DECL_REGISTER (b->decl) = 0;
567 TREE_THIS_VOLATILE (b->decl) = 1;
571 /* Do not climb up past the current function. */
572 if (scope->function_body)
577 /* Nonzero if we are currently in file scope. */
580 global_bindings_p (void)
582 return current_scope == file_scope && !c_override_global_bindings_to_false;
586 keep_next_level (void)
588 keep_next_level_flag = true;
591 /* Identify this scope as currently being filled with parameters. */
594 declare_parm_level (void)
596 current_scope->parm_flag = true;
602 if (next_is_function_body)
604 /* This is the transition from the parameters to the top level
605 of the function body. These are the same scope
606 (C99 6.2.1p4,6) so we do not push another scope structure.
607 next_is_function_body is set only by store_parm_decls, which
608 in turn is called when and only when we are about to
609 encounter the opening curly brace for the function body.
611 The outermost block of a function always gets a BLOCK node,
612 because the debugging output routines expect that each
613 function has at least one BLOCK. */
614 current_scope->parm_flag = false;
615 current_scope->function_body = true;
616 current_scope->keep = true;
617 current_scope->outer_function = current_function_scope;
618 current_function_scope = current_scope;
620 keep_next_level_flag = false;
621 next_is_function_body = false;
625 struct c_scope *scope;
628 scope = scope_freelist;
629 scope_freelist = scope->outer;
632 scope = GGC_CNEW (struct c_scope);
634 scope->keep = keep_next_level_flag;
635 scope->outer = current_scope;
636 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
638 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
640 if (current_scope && scope->depth == 0)
643 sorry ("GCC supports only %u nested scopes", scope->depth);
646 current_scope = scope;
647 keep_next_level_flag = false;
651 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
654 set_type_context (tree type, tree context)
656 for (type = TYPE_MAIN_VARIANT (type); type;
657 type = TYPE_NEXT_VARIANT (type))
658 TYPE_CONTEXT (type) = context;
661 /* Exit a scope. Restore the state of the identifier-decl mappings
662 that were in effect when this scope was entered. Return a BLOCK
663 node containing all the DECLs in this scope that are of interest
664 to debug info generation. */
669 struct c_scope *scope = current_scope;
670 tree block, context, p;
673 bool functionbody = scope->function_body;
674 bool keep = functionbody || scope->keep || scope->bindings;
676 /* If appropriate, create a BLOCK to record the decls for the life
681 block = make_node (BLOCK);
682 BLOCK_SUBBLOCKS (block) = scope->blocks;
683 TREE_USED (block) = 1;
685 /* In each subblock, record that this is its superior. */
686 for (p = scope->blocks; p; p = TREE_CHAIN (p))
687 BLOCK_SUPERCONTEXT (p) = block;
689 BLOCK_VARS (block) = 0;
692 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
693 scope must be set so that they point to the appropriate
694 construct, i.e. either to the current FUNCTION_DECL node, or
695 else to the BLOCK node we just constructed.
697 Note that for tagged types whose scope is just the formal
698 parameter list for some function type specification, we can't
699 properly set their TYPE_CONTEXTs here, because we don't have a
700 pointer to the appropriate FUNCTION_TYPE node readily available
701 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
702 type nodes get set in `grokdeclarator' as soon as we have created
703 the FUNCTION_TYPE node which will represent the "scope" for these
704 "parameter list local" tagged types. */
705 if (scope->function_body)
706 context = current_function_decl;
707 else if (scope == file_scope)
709 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
710 TREE_CHAIN (file_decl) = all_translation_units;
711 all_translation_units = file_decl;
717 /* Clear all bindings in this scope. */
718 for (b = scope->bindings; b; b = free_binding_and_advance (b))
721 switch (TREE_CODE (p))
724 /* Warnings for unused labels, errors for undefined labels. */
725 if (TREE_USED (p) && !DECL_INITIAL (p))
727 error ("%Jlabel %qD used but not defined", p, p);
728 DECL_INITIAL (p) = error_mark_node;
730 else if (!TREE_USED (p) && warn_unused_label)
732 if (DECL_INITIAL (p))
733 warning ("%Jlabel %qD defined but not used", p, p);
735 warning ("%Jlabel %qD declared but not defined", p, p);
737 /* Labels go in BLOCK_VARS. */
738 TREE_CHAIN (p) = BLOCK_VARS (block);
739 BLOCK_VARS (block) = p;
740 gcc_assert (I_LABEL_BINDING (b->id) == b);
741 I_LABEL_BINDING (b->id) = b->shadowed;
747 set_type_context (p, context);
749 /* Types may not have tag-names, in which case the type
750 appears in the bindings list with b->id NULL. */
753 gcc_assert (I_TAG_BINDING (b->id) == b);
754 I_TAG_BINDING (b->id) = b->shadowed;
759 /* Propagate TREE_ADDRESSABLE from nested functions to their
760 containing functions. */
761 if (!TREE_ASM_WRITTEN (p)
762 && DECL_INITIAL (p) != 0
763 && TREE_ADDRESSABLE (p)
764 && DECL_ABSTRACT_ORIGIN (p) != 0
765 && DECL_ABSTRACT_ORIGIN (p) != p)
766 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
767 if (!DECL_EXTERNAL (p)
768 && DECL_INITIAL (p) == 0)
770 error ("%Jnested function %qD declared but never defined", p, p);
771 undef_nested_function = true;
776 /* Warnings for unused variables. */
777 if (warn_unused_variable
779 && !DECL_IN_SYSTEM_HEADER (p)
781 && !DECL_ARTIFICIAL (p)
782 && scope != file_scope
783 && scope != external_scope)
784 warning ("%Junused variable %qD", p, p);
788 error ("%Jtype of array %qD completed incompatibly with"
789 " implicit initialization", p, p);
796 /* All of these go in BLOCK_VARS, but only if this is the
797 binding in the home scope. */
800 TREE_CHAIN (p) = BLOCK_VARS (block);
801 BLOCK_VARS (block) = p;
803 /* If this is the file scope, and we are processing more
804 than one translation unit in this compilation, set
805 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
806 This makes same_translation_unit_p work, and causes
807 static declarations to be given disambiguating suffixes. */
808 if (scope == file_scope && num_in_fnames > 1)
810 DECL_CONTEXT (p) = context;
811 if (TREE_CODE (p) == TYPE_DECL)
812 set_type_context (TREE_TYPE (p), context);
816 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
817 already been put there by store_parm_decls. Unused-
818 parameter warnings are handled by function.c.
819 error_mark_node obviously does not go in BLOCK_VARS and
820 does not get unused-variable warnings. */
823 /* It is possible for a decl not to have a name. We get
824 here with b->id NULL in this case. */
827 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
828 I_SYMBOL_BINDING (b->id) = b->shadowed;
829 if (b->shadowed && b->shadowed->type)
830 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
840 /* Dispose of the block that we just made inside some higher level. */
841 if ((scope->function_body || scope == file_scope) && context)
843 DECL_INITIAL (context) = block;
844 BLOCK_SUPERCONTEXT (block) = context;
846 else if (scope->outer)
849 SCOPE_LIST_APPEND (scope->outer, blocks, block);
850 /* If we did not make a block for the scope just exited, any
851 blocks made for inner scopes must be carried forward so they
852 will later become subblocks of something else. */
853 else if (scope->blocks)
854 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
857 /* Pop the current scope, and free the structure for reuse. */
858 current_scope = scope->outer;
859 if (scope->function_body)
860 current_function_scope = scope->outer_function;
862 memset (scope, 0, sizeof (struct c_scope));
863 scope->outer = scope_freelist;
864 scope_freelist = scope;
870 push_file_scope (void)
878 file_scope = current_scope;
880 start_fname_decls ();
882 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
883 bind (DECL_NAME (decl), decl, file_scope,
884 /*invisible=*/false, /*nested=*/true);
888 pop_file_scope (void)
890 /* In case there were missing closebraces, get us back to the global
892 while (current_scope != file_scope)
895 /* __FUNCTION__ is defined at file scope (""). This
896 call may not be necessary as my tests indicate it
897 still works without it. */
898 finish_fname_decls ();
900 /* This is the point to write out a PCH if we're doing that.
901 In that case we do not want to do anything else. */
904 c_common_write_pch ();
908 /* Pop off the file scope and close this translation unit. */
912 maybe_apply_pending_pragma_weaks ();
913 cgraph_finalize_compilation_unit ();
916 /* Insert BLOCK at the end of the list of subblocks of the current
917 scope. This is used when a BIND_EXPR is expanded, to handle the
918 BLOCK node inside the BIND_EXPR. */
921 insert_block (tree block)
923 TREE_USED (block) = 1;
924 SCOPE_LIST_APPEND (current_scope, blocks, block);
927 /* Push a definition or a declaration of struct, union or enum tag "name".
928 "type" should be the type node.
929 We assume that the tag "name" is not already defined.
931 Note that the definition may really be just a forward reference.
932 In that case, the TYPE_SIZE will be zero. */
935 pushtag (tree name, tree type)
937 /* Record the identifier as the type's name if it has none. */
938 if (name && !TYPE_NAME (type))
939 TYPE_NAME (type) = name;
940 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
942 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
943 tagged type we just added to the current scope. This fake
944 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
945 to output a representation of a tagged type, and it also gives
946 us a convenient place to record the "scope start" address for the
949 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
951 /* An approximation for now, so we can tell this is a function-scope tag.
952 This will be updated in pop_scope. */
953 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
956 /* Subroutine of compare_decls. Allow harmless mismatches in return
957 and argument types provided that the type modes match. This function
958 return a unified type given a suitable match, and 0 otherwise. */
961 match_builtin_function_types (tree newtype, tree oldtype)
963 tree newrettype, oldrettype;
964 tree newargs, oldargs;
965 tree trytype, tryargs;
967 /* Accept the return type of the new declaration if same modes. */
968 oldrettype = TREE_TYPE (oldtype);
969 newrettype = TREE_TYPE (newtype);
971 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
974 oldargs = TYPE_ARG_TYPES (oldtype);
975 newargs = TYPE_ARG_TYPES (newtype);
978 while (oldargs || newargs)
982 || !TREE_VALUE (oldargs)
983 || !TREE_VALUE (newargs)
984 || TYPE_MODE (TREE_VALUE (oldargs))
985 != TYPE_MODE (TREE_VALUE (newargs)))
988 oldargs = TREE_CHAIN (oldargs);
989 newargs = TREE_CHAIN (newargs);
992 trytype = build_function_type (newrettype, tryargs);
993 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
996 /* Subroutine of diagnose_mismatched_decls. Check for function type
997 mismatch involving an empty arglist vs a nonempty one and give clearer
1000 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1001 tree newtype, tree oldtype)
1005 if (TREE_CODE (olddecl) != FUNCTION_DECL
1006 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1007 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1009 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1012 t = TYPE_ARG_TYPES (oldtype);
1014 t = TYPE_ARG_TYPES (newtype);
1015 for (; t; t = TREE_CHAIN (t))
1017 tree type = TREE_VALUE (t);
1019 if (TREE_CHAIN (t) == 0
1020 && TYPE_MAIN_VARIANT (type) != void_type_node)
1022 inform ("a parameter list with an ellipsis can%'t match "
1023 "an empty parameter name list declaration");
1027 if (c_type_promotes_to (type) != type)
1029 inform ("an argument type that has a default promotion can%'t match "
1030 "an empty parameter name list declaration");
1036 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1037 old-style function definition, NEWDECL is a prototype declaration.
1038 Diagnose inconsistencies in the argument list. Returns TRUE if
1039 the prototype is compatible, FALSE if not. */
1041 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1043 tree newargs, oldargs;
1046 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
1047 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
1049 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1050 newargs = TYPE_ARG_TYPES (newtype);
1055 tree oldargtype = TREE_VALUE (oldargs);
1056 tree newargtype = TREE_VALUE (newargs);
1058 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1061 /* Reaching the end of just one list means the two decls don't
1062 agree on the number of arguments. */
1063 if (END_OF_ARGLIST (oldargtype))
1065 error ("%Jprototype for %qD declares more arguments "
1066 "than previous old-style definition", newdecl, newdecl);
1069 else if (END_OF_ARGLIST (newargtype))
1071 error ("%Jprototype for %qD declares fewer arguments "
1072 "than previous old-style definition", newdecl, newdecl);
1076 /* Type for passing arg must be consistent with that declared
1078 else if (!comptypes (oldargtype, newargtype))
1080 error ("%Jprototype for %qD declares argument %d"
1081 " with incompatible type",
1082 newdecl, newdecl, i);
1086 oldargs = TREE_CHAIN (oldargs);
1087 newargs = TREE_CHAIN (newargs);
1091 /* If we get here, no errors were found, but do issue a warning
1092 for this poor-style construct. */
1093 warning ("%Jprototype for %qD follows non-prototype definition",
1096 #undef END_OF_ARGLIST
1099 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1100 first in a pair of mismatched declarations, using the diagnostic
1103 locate_old_decl (tree decl, void (*diag)(const char *, ...))
1105 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1107 else if (DECL_INITIAL (decl))
1108 diag (N_("%Jprevious definition of %qD was here"), decl, decl);
1109 else if (C_DECL_IMPLICIT (decl))
1110 diag (N_("%Jprevious implicit declaration of %qD was here"), decl, decl);
1112 diag (N_("%Jprevious declaration of %qD was here"), decl, decl);
1115 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1116 Returns true if the caller should proceed to merge the two, false
1117 if OLDDECL should simply be discarded. As a side effect, issues
1118 all necessary diagnostics for invalid or poor-style combinations.
1119 If it returns true, writes the types of NEWDECL and OLDDECL to
1120 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1121 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1124 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1125 tree *newtypep, tree *oldtypep)
1127 tree newtype, oldtype;
1128 bool pedwarned = false;
1129 bool warned = false;
1132 /* If we have error_mark_node for either decl or type, just discard
1133 the previous decl - we're in an error cascade already. */
1134 if (olddecl == error_mark_node || newdecl == error_mark_node)
1136 *oldtypep = oldtype = TREE_TYPE (olddecl);
1137 *newtypep = newtype = TREE_TYPE (newdecl);
1138 if (oldtype == error_mark_node || newtype == error_mark_node)
1141 /* Two different categories of symbol altogether. This is an error
1142 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1143 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1145 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1146 && DECL_BUILT_IN (olddecl)
1147 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1149 error ("%J%qD redeclared as different kind of symbol",
1151 locate_old_decl (olddecl, error);
1153 else if (TREE_PUBLIC (newdecl))
1154 warning ("%Jbuilt-in function %qD declared as non-function",
1156 else if (warn_shadow)
1157 warning ("%Jdeclaration of %qD shadows a built-in function",
1162 /* Enumerators have no linkage, so may only be declared once in a
1164 if (TREE_CODE (olddecl) == CONST_DECL)
1166 error ("%Jredeclaration of enumerator %qD", newdecl, newdecl);
1167 locate_old_decl (olddecl, error);
1171 if (!comptypes (oldtype, newtype))
1173 if (TREE_CODE (olddecl) == FUNCTION_DECL
1174 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1176 /* Accept harmless mismatch in function types.
1177 This is for the ffs and fprintf builtins. */
1178 tree trytype = match_builtin_function_types (newtype, oldtype);
1180 if (trytype && comptypes (newtype, trytype))
1181 *oldtypep = oldtype = trytype;
1184 /* If types don't match for a built-in, throw away the
1185 built-in. No point in calling locate_old_decl here, it
1186 won't print anything. */
1187 warning ("%Jconflicting types for built-in function %qD",
1192 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1193 && DECL_IS_BUILTIN (olddecl))
1195 /* A conflicting function declaration for a predeclared
1196 function that isn't actually built in. Objective C uses
1197 these. The new declaration silently overrides everything
1198 but the volatility (i.e. noreturn) indication. See also
1199 below. FIXME: Make Objective C use normal builtins. */
1200 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1203 /* Permit void foo (...) to match int foo (...) if the latter is
1204 the definition and implicit int was used. See
1205 c-torture/compile/920625-2.c. */
1206 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1207 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1208 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1209 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1211 pedwarn ("%Jconflicting types for %qD", newdecl, newdecl);
1212 /* Make sure we keep void as the return type. */
1213 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1214 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1217 /* Permit void foo (...) to match an earlier call to foo (...) with
1218 no declared type (thus, implicitly int). */
1219 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1220 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1221 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1222 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1224 pedwarn ("%Jconflicting types for %qD", newdecl, newdecl);
1225 /* Make sure we keep void as the return type. */
1226 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1231 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1232 error ("%J conflicting type qualifiers for %qD", newdecl, newdecl);
1234 error ("%Jconflicting types for %qD", newdecl, newdecl);
1235 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1236 locate_old_decl (olddecl, error);
1241 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1242 but silently ignore the redeclaration if either is in a system
1243 header. (Conflicting redeclarations were handled above.) */
1244 if (TREE_CODE (newdecl) == TYPE_DECL)
1246 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1247 return true; /* Allow OLDDECL to continue in use. */
1249 error ("%Jredefinition of typedef %qD", newdecl, newdecl);
1250 locate_old_decl (olddecl, error);
1254 /* Function declarations can either be 'static' or 'extern' (no
1255 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1256 can never conflict with each other on account of linkage (6.2.2p4).
1257 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1258 two definitions if one is 'extern inline' and one is not. The non-
1259 extern-inline definition supersedes the extern-inline definition. */
1260 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1262 /* If you declare a built-in function name as static, or
1263 define the built-in with an old-style definition (so we
1264 can't validate the argument list) the built-in definition is
1265 overridden, but optionally warn this was a bad choice of name. */
1266 if (DECL_BUILT_IN (olddecl)
1267 && !C_DECL_DECLARED_BUILTIN (olddecl)
1268 && (!TREE_PUBLIC (newdecl)
1269 || (DECL_INITIAL (newdecl)
1270 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1273 warning ("%Jdeclaration of %qD shadows a built-in function",
1275 /* Discard the old built-in function. */
1279 if (DECL_INITIAL (newdecl))
1281 if (DECL_INITIAL (olddecl))
1283 /* If both decls have extern inline and are in the same TU,
1284 reject the new decl. */
1285 if (DECL_DECLARED_INLINE_P (olddecl)
1286 && DECL_EXTERNAL (olddecl)
1287 && DECL_DECLARED_INLINE_P (newdecl)
1288 && DECL_EXTERNAL (newdecl)
1289 && same_translation_unit_p (newdecl, olddecl))
1291 error ("%Jredefinition of %qD", newdecl, newdecl);
1292 locate_old_decl (olddecl, error);
1295 /* If both decls have not extern inline, reject the new decl. */
1296 if (!DECL_DECLARED_INLINE_P (olddecl)
1297 && !DECL_EXTERNAL (olddecl)
1298 && !DECL_DECLARED_INLINE_P (newdecl)
1299 && !DECL_EXTERNAL (newdecl))
1301 error ("%Jredefinition of %qD", newdecl, newdecl);
1302 locate_old_decl (olddecl, error);
1305 /* If the new decl is declared as extern inline, error if they are
1306 in the same TU, otherwise retain the old decl. */
1307 if (!DECL_DECLARED_INLINE_P (olddecl)
1308 && !DECL_EXTERNAL (olddecl)
1309 && DECL_DECLARED_INLINE_P (newdecl)
1310 && DECL_EXTERNAL (newdecl))
1312 if (same_translation_unit_p (newdecl, olddecl))
1314 error ("%Jredefinition of %qD", newdecl, newdecl);
1315 locate_old_decl (olddecl, error);
1323 /* If we have a prototype after an old-style function definition,
1324 the argument types must be checked specially. */
1325 else if (DECL_INITIAL (olddecl)
1326 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1327 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1328 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1330 locate_old_decl (olddecl, error);
1333 /* A non-static declaration (even an "extern") followed by a
1334 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1335 The same is true for a static forward declaration at block
1336 scope followed by a non-static declaration/definition at file
1337 scope. Static followed by non-static at the same scope is
1338 not undefined behavior, and is the most convenient way to get
1339 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1340 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1341 we do diagnose it if -Wtraditional. */
1342 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1344 /* Two exceptions to the rule. If olddecl is an extern
1345 inline, or a predeclared function that isn't actually
1346 built in, newdecl silently overrides olddecl. The latter
1347 occur only in Objective C; see also above. (FIXME: Make
1348 Objective C use normal builtins.) */
1349 if (!DECL_IS_BUILTIN (olddecl)
1350 && !(DECL_EXTERNAL (olddecl)
1351 && DECL_DECLARED_INLINE_P (olddecl)))
1353 error ("%Jstatic declaration of %qD follows "
1354 "non-static declaration", newdecl, newdecl);
1355 locate_old_decl (olddecl, error);
1359 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1361 if (DECL_CONTEXT (olddecl))
1363 error ("%Jnon-static declaration of %qD follows "
1364 "static declaration", newdecl, newdecl);
1365 locate_old_decl (olddecl, error);
1368 else if (warn_traditional)
1370 warning ("%Jnon-static declaration of %qD follows "
1371 "static declaration", newdecl, newdecl);
1376 else if (TREE_CODE (newdecl) == VAR_DECL)
1378 /* Only variables can be thread-local, and all declarations must
1379 agree on this property. */
1380 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1382 if (DECL_THREAD_LOCAL (newdecl))
1383 error ("%Jthread-local declaration of %qD follows "
1384 "non-thread-local declaration", newdecl, newdecl);
1386 error ("%Jnon-thread-local declaration of %qD follows "
1387 "thread-local declaration", newdecl, newdecl);
1389 locate_old_decl (olddecl, error);
1393 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1394 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1396 error ("%Jredefinition of %qD", newdecl, newdecl);
1397 locate_old_decl (olddecl, error);
1401 /* Objects declared at file scope: if the first declaration had
1402 external linkage (even if it was an external reference) the
1403 second must have external linkage as well, or the behavior is
1404 undefined. If the first declaration had internal linkage, then
1405 the second must too, or else be an external reference (in which
1406 case the composite declaration still has internal linkage).
1407 As for function declarations, we warn about the static-then-
1408 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1409 if (DECL_FILE_SCOPE_P (newdecl)
1410 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1412 if (DECL_EXTERNAL (newdecl))
1414 if (!DECL_FILE_SCOPE_P (olddecl))
1416 error ("%Jextern declaration of %qD follows "
1417 "declaration with no linkage", newdecl, newdecl);
1418 locate_old_decl (olddecl, error);
1421 else if (warn_traditional)
1423 warning ("%Jnon-static declaration of %qD follows "
1424 "static declaration", newdecl, newdecl);
1430 if (TREE_PUBLIC (newdecl))
1431 error ("%Jnon-static declaration of %qD follows "
1432 "static declaration", newdecl, newdecl);
1434 error ("%Jstatic declaration of %qD follows "
1435 "non-static declaration", newdecl, newdecl);
1437 locate_old_decl (olddecl, error);
1441 /* Two objects with the same name declared at the same block
1442 scope must both be external references (6.7p3). */
1443 else if (!DECL_FILE_SCOPE_P (newdecl))
1445 if (DECL_EXTERNAL (newdecl))
1447 /* Extern with initializer at block scope, which will
1448 already have received an error. */
1450 else if (DECL_EXTERNAL (olddecl))
1452 error ("%Jdeclaration of %qD with no linkage follows "
1453 "extern declaration", newdecl, newdecl);
1454 locate_old_decl (olddecl, error);
1458 error ("%Jredeclaration of %qD with no linkage",
1460 locate_old_decl (olddecl, error);
1468 /* All decls must agree on a visibility. */
1469 if (DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1470 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1472 warning ("%Jredeclaration of %qD with different visibility "
1473 "(old visibility preserved)", newdecl, newdecl);
1477 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1479 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1480 if (DECL_DECLARED_INLINE_P (newdecl)
1481 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1483 warning ("%Jinline declaration of %qD follows "
1484 "declaration with attribute noinline", newdecl, newdecl);
1487 else if (DECL_DECLARED_INLINE_P (olddecl)
1488 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1490 warning ("%Jdeclaration of %qD with attribute noinline follows "
1491 "inline declaration ", newdecl, newdecl);
1495 /* Inline declaration after use or definition.
1496 ??? Should we still warn about this now we have unit-at-a-time
1497 mode and can get it right?
1498 Definitely don't complain if the decls are in different translation
1500 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1501 && same_translation_unit_p (olddecl, newdecl))
1503 if (TREE_USED (olddecl))
1505 warning ("%J%qD declared inline after being called",
1509 else if (DECL_INITIAL (olddecl))
1511 warning ("%J%qD declared inline after its definition",
1517 else /* PARM_DECL, VAR_DECL */
1519 /* Redeclaration of a parameter is a constraint violation (this is
1520 not explicitly stated, but follows from C99 6.7p3 [no more than
1521 one declaration of the same identifier with no linkage in the
1522 same scope, except type tags] and 6.2.2p6 [parameters have no
1523 linkage]). We must check for a forward parameter declaration,
1524 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1525 an extension, the mandatory diagnostic for which is handled by
1526 mark_forward_parm_decls. */
1528 if (TREE_CODE (newdecl) == PARM_DECL
1529 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1531 error ("%Jredefinition of parameter %qD", newdecl, newdecl);
1532 locate_old_decl (olddecl, error);
1537 /* Optional warning for completely redundant decls. */
1538 if (!warned && !pedwarned
1539 && warn_redundant_decls
1540 /* Don't warn about a function declaration followed by a
1542 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1543 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1544 /* Don't warn about redundant redeclarations of builtins. */
1545 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1546 && !DECL_BUILT_IN (newdecl)
1547 && DECL_BUILT_IN (olddecl)
1548 && !C_DECL_DECLARED_BUILTIN (olddecl))
1549 /* Don't warn about an extern followed by a definition. */
1550 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1551 /* Don't warn about forward parameter decls. */
1552 && !(TREE_CODE (newdecl) == PARM_DECL
1553 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1555 warning ("%Jredundant redeclaration of %qD", newdecl, newdecl);
1559 /* Report location of previous decl/defn in a consistent manner. */
1560 if (warned || pedwarned)
1561 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1566 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1567 consistent with OLDDECL, but carries new information. Merge the
1568 new information into OLDDECL. This function issues no
1572 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1574 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1575 && DECL_INITIAL (newdecl) != 0);
1577 /* For real parm decl following a forward decl, rechain the old decl
1578 in its new location and clear TREE_ASM_WRITTEN (it's not a
1579 forward decl anymore). */
1580 if (TREE_CODE (newdecl) == PARM_DECL
1581 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1583 struct c_binding *b, **here;
1585 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1586 if ((*here)->decl == olddecl)
1593 b->prev = current_scope->bindings;
1594 current_scope->bindings = b;
1596 TREE_ASM_WRITTEN (olddecl) = 0;
1599 DECL_ATTRIBUTES (newdecl)
1600 = targetm.merge_decl_attributes (olddecl, newdecl);
1602 /* Merge the data types specified in the two decls. */
1604 = TREE_TYPE (olddecl)
1605 = composite_type (newtype, oldtype);
1607 /* Lay the type out, unless already done. */
1608 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1610 if (TREE_TYPE (newdecl) != error_mark_node)
1611 layout_type (TREE_TYPE (newdecl));
1612 if (TREE_CODE (newdecl) != FUNCTION_DECL
1613 && TREE_CODE (newdecl) != TYPE_DECL
1614 && TREE_CODE (newdecl) != CONST_DECL)
1615 layout_decl (newdecl, 0);
1619 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1620 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1621 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1622 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1623 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1624 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1626 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1627 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1631 /* Keep the old rtl since we can safely use it. */
1632 COPY_DECL_RTL (olddecl, newdecl);
1634 /* Merge the type qualifiers. */
1635 if (TREE_READONLY (newdecl))
1636 TREE_READONLY (olddecl) = 1;
1638 if (TREE_THIS_VOLATILE (newdecl))
1640 TREE_THIS_VOLATILE (olddecl) = 1;
1641 if (TREE_CODE (newdecl) == VAR_DECL)
1642 make_var_volatile (newdecl);
1645 /* Merge deprecatedness. */
1646 if (TREE_DEPRECATED (newdecl))
1647 TREE_DEPRECATED (olddecl) = 1;
1649 /* Keep source location of definition rather than declaration. */
1650 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1651 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1653 /* Merge the unused-warning information. */
1654 if (DECL_IN_SYSTEM_HEADER (olddecl))
1655 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1656 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1657 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1659 /* Merge the initialization information. */
1660 if (DECL_INITIAL (newdecl) == 0)
1661 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1663 /* Merge the section attribute.
1664 We want to issue an error if the sections conflict but that must be
1665 done later in decl_attributes since we are called before attributes
1667 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1668 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1670 /* Copy the assembler name.
1671 Currently, it can only be defined in the prototype. */
1672 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1674 /* Use visibility of whichever declaration had it specified */
1675 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1677 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1678 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1681 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1683 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1684 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1685 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1686 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1687 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1688 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1689 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1690 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1691 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1692 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1695 /* Merge the storage class information. */
1696 merge_weak (newdecl, olddecl);
1698 /* For functions, static overrides non-static. */
1699 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1701 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1702 /* This is since we don't automatically
1703 copy the attributes of NEWDECL into OLDDECL. */
1704 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1705 /* If this clears `static', clear it in the identifier too. */
1706 if (!TREE_PUBLIC (olddecl))
1707 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1709 if (DECL_EXTERNAL (newdecl))
1711 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1712 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1714 /* An extern decl does not override previous storage class. */
1715 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1716 if (!DECL_EXTERNAL (newdecl))
1718 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1719 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1724 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1725 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1728 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1730 /* If we're redefining a function previously defined as extern
1731 inline, make sure we emit debug info for the inline before we
1732 throw it away, in case it was inlined into a function that hasn't
1733 been written out yet. */
1734 if (new_is_definition && DECL_INITIAL (olddecl))
1736 if (TREE_USED (olddecl)
1737 /* In unit-at-a-time mode we never inline re-defined extern
1738 inline functions. */
1739 && !flag_unit_at_a_time
1740 && cgraph_function_possibly_inlined_p (olddecl))
1741 (*debug_hooks->outlining_inline_function) (olddecl);
1743 /* The new defn must not be inline. */
1744 DECL_INLINE (newdecl) = 0;
1745 DECL_UNINLINABLE (newdecl) = 1;
1749 /* If either decl says `inline', this fn is inline,
1750 unless its definition was passed already. */
1751 if (DECL_DECLARED_INLINE_P (newdecl)
1752 || DECL_DECLARED_INLINE_P (olddecl))
1753 DECL_DECLARED_INLINE_P (newdecl) = 1;
1755 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1756 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1759 if (DECL_BUILT_IN (olddecl))
1761 /* If redeclaring a builtin function, it stays built in.
1762 But it gets tagged as having been declared. */
1763 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1764 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1765 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1768 /* Also preserve various other info from the definition. */
1769 if (!new_is_definition)
1771 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1772 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1773 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1774 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1775 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1777 /* Set DECL_INLINE on the declaration if we've got a body
1778 from which to instantiate. */
1779 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1781 DECL_INLINE (newdecl) = 1;
1782 DECL_ABSTRACT_ORIGIN (newdecl)
1783 = DECL_ABSTRACT_ORIGIN (olddecl);
1788 /* If a previous declaration said inline, mark the
1789 definition as inlinable. */
1790 if (DECL_DECLARED_INLINE_P (newdecl)
1791 && !DECL_UNINLINABLE (newdecl))
1792 DECL_INLINE (newdecl) = 1;
1796 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1797 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1799 unsigned olddecl_uid = DECL_UID (olddecl);
1800 tree olddecl_context = DECL_CONTEXT (olddecl);
1802 memcpy ((char *) olddecl + sizeof (struct tree_common),
1803 (char *) newdecl + sizeof (struct tree_common),
1804 sizeof (struct tree_decl) - sizeof (struct tree_common));
1805 DECL_UID (olddecl) = olddecl_uid;
1806 DECL_CONTEXT (olddecl) = olddecl_context;
1809 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1810 so that encode_section_info has a chance to look at the new decl
1811 flags and attributes. */
1812 if (DECL_RTL_SET_P (olddecl)
1813 && (TREE_CODE (olddecl) == FUNCTION_DECL
1814 || (TREE_CODE (olddecl) == VAR_DECL
1815 && TREE_STATIC (olddecl))))
1816 make_decl_rtl (olddecl);
1819 /* Handle when a new declaration NEWDECL has the same name as an old
1820 one OLDDECL in the same binding contour. Prints an error message
1823 If safely possible, alter OLDDECL to look like NEWDECL, and return
1824 true. Otherwise, return false. */
1827 duplicate_decls (tree newdecl, tree olddecl)
1829 tree newtype = NULL, oldtype = NULL;
1831 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1834 merge_decls (newdecl, olddecl, newtype, oldtype);
1839 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1841 warn_if_shadowing (tree new_decl)
1843 struct c_binding *b;
1845 /* Shadow warnings wanted? */
1847 /* No shadow warnings for internally generated vars. */
1848 || DECL_IS_BUILTIN (new_decl)
1849 /* No shadow warnings for vars made for inlining. */
1850 || DECL_FROM_INLINE (new_decl)
1851 /* Don't warn about the parm names in function declarator
1852 within a function declarator. It would be nice to avoid
1853 warning in any function declarator in a declaration, as
1854 opposed to a definition, but there is no way to tell
1855 it's not a definition at this point. */
1856 || (TREE_CODE (new_decl) == PARM_DECL && current_scope->outer->parm_flag))
1859 /* Is anything being shadowed? Invisible decls do not count. */
1860 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1861 if (b->decl && b->decl != new_decl && !b->invisible)
1863 tree old_decl = b->decl;
1865 if (old_decl == error_mark_node)
1867 warning ("%Jdeclaration of %qD shadows previous non-variable",
1868 new_decl, new_decl);
1871 else if (TREE_CODE (old_decl) == PARM_DECL)
1872 warning ("%Jdeclaration of %qD shadows a parameter",
1873 new_decl, new_decl);
1874 else if (DECL_FILE_SCOPE_P (old_decl))
1875 warning ("%Jdeclaration of %qD shadows a global declaration",
1876 new_decl, new_decl);
1877 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1878 && DECL_BUILT_IN (old_decl))
1880 warning ("%Jdeclaration of %qD shadows a built-in function",
1881 new_decl, new_decl);
1885 warning ("%Jdeclaration of %qD shadows a previous local",
1886 new_decl, new_decl);
1888 warning ("%Jshadowed declaration is here", old_decl);
1895 /* Subroutine of pushdecl.
1897 X is a TYPE_DECL for a typedef statement. Create a brand new
1898 ..._TYPE node (which will be just a variant of the existing
1899 ..._TYPE node with identical properties) and then install X
1900 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1902 The whole point here is to end up with a situation where each
1903 and every ..._TYPE node the compiler creates will be uniquely
1904 associated with AT MOST one node representing a typedef name.
1905 This way, even though the compiler substitutes corresponding
1906 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1907 early on, later parts of the compiler can always do the reverse
1908 translation and get back the corresponding typedef name. For
1911 typedef struct S MY_TYPE;
1914 Later parts of the compiler might only know that `object' was of
1915 type `struct S' if it were not for code just below. With this
1916 code however, later parts of the compiler see something like:
1918 struct S' == struct S
1919 typedef struct S' MY_TYPE;
1922 And they can then deduce (from the node for type struct S') that
1923 the original object declaration was:
1927 Being able to do this is important for proper support of protoize,
1928 and also for generating precise symbolic debugging information
1929 which takes full account of the programmer's (typedef) vocabulary.
1931 Obviously, we don't want to generate a duplicate ..._TYPE node if
1932 the TYPE_DECL node that we are now processing really represents a
1933 standard built-in type.
1935 Since all standard types are effectively declared at line zero
1936 in the source file, we can easily check to see if we are working
1937 on a standard type by checking the current value of lineno. */
1940 clone_underlying_type (tree x)
1942 if (DECL_IS_BUILTIN (x))
1944 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1945 TYPE_NAME (TREE_TYPE (x)) = x;
1947 else if (TREE_TYPE (x) != error_mark_node
1948 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1950 tree tt = TREE_TYPE (x);
1951 DECL_ORIGINAL_TYPE (x) = tt;
1952 tt = build_variant_type_copy (tt);
1954 TREE_USED (tt) = TREE_USED (x);
1959 /* Record a decl-node X as belonging to the current lexical scope.
1960 Check for errors (such as an incompatible declaration for the same
1961 name already seen in the same scope).
1963 Returns either X or an old decl for the same name.
1964 If an old decl is returned, it may have been smashed
1965 to agree with what X says. */
1970 tree name = DECL_NAME (x);
1971 struct c_scope *scope = current_scope;
1972 struct c_binding *b;
1973 bool nested = false;
1975 /* Functions need the lang_decl data. */
1976 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
1977 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
1979 /* Must set DECL_CONTEXT for everything not at file scope or
1980 DECL_FILE_SCOPE_P won't work. Local externs don't count
1981 unless they have initializers (which generate code). */
1982 if (current_function_decl
1983 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
1984 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
1985 DECL_CONTEXT (x) = current_function_decl;
1987 /* Anonymous decls are just inserted in the scope. */
1990 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
1994 /* First, see if there is another declaration with the same name in
1995 the current scope. If there is, duplicate_decls may do all the
1996 work for us. If duplicate_decls returns false, that indicates
1997 two incompatible decls in the same scope; we are to silently
1998 replace the old one (duplicate_decls has issued all appropriate
1999 diagnostics). In particular, we should not consider possible
2000 duplicates in the external scope, or shadowing. */
2001 b = I_SYMBOL_BINDING (name);
2002 if (b && B_IN_SCOPE (b, scope))
2004 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2005 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2006 b->inner_comp = false;
2007 if (duplicate_decls (x, b->decl))
2010 goto skip_external_and_shadow_checks;
2013 /* All declarations with external linkage, and all external
2014 references, go in the external scope, no matter what scope is
2015 current. However, the binding in that scope is ignored for
2016 purposes of normal name lookup. A separate binding structure is
2017 created in the requested scope; this governs the normal
2018 visibility of the symbol.
2020 The binding in the externals scope is used exclusively for
2021 detecting duplicate declarations of the same object, no matter
2022 what scope they are in; this is what we do here. (C99 6.2.7p2:
2023 All declarations that refer to the same object or function shall
2024 have compatible type; otherwise, the behavior is undefined.) */
2025 if (DECL_EXTERNAL (x) || scope == file_scope)
2027 tree type = TREE_TYPE (x);
2030 bool type_saved = false;
2031 if (b && !B_IN_EXTERNAL_SCOPE (b)
2032 && (TREE_CODE (b->decl) == FUNCTION_DECL
2033 || TREE_CODE (b->decl) == VAR_DECL)
2034 && DECL_FILE_SCOPE_P (b->decl))
2037 vistype = TREE_TYPE (visdecl);
2039 if (warn_nested_externs
2040 && scope != file_scope
2041 && !DECL_IN_SYSTEM_HEADER (x))
2042 warning ("nested extern declaration of %qD", x);
2044 while (b && !B_IN_EXTERNAL_SCOPE (b))
2046 /* If this decl might be modified, save its type. This is
2047 done here rather than when the decl is first bound
2048 because the type may change after first binding, through
2049 being completed or through attributes being added. If we
2050 encounter multiple such decls, only the first should have
2051 its type saved; the others will already have had their
2052 proper types saved and the types will not have changed as
2053 their scopes will not have been re-entered. */
2054 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2056 b->type = TREE_TYPE (b->decl);
2059 if (B_IN_FILE_SCOPE (b)
2060 && TREE_CODE (b->decl) == VAR_DECL
2061 && TREE_STATIC (b->decl)
2062 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2063 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2064 && TREE_CODE (type) == ARRAY_TYPE
2065 && TYPE_DOMAIN (type)
2066 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2067 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2069 /* Array type completed in inner scope, which should be
2070 diagnosed if the completion does not have size 1 and
2071 it does not get completed in the file scope. */
2072 b->inner_comp = true;
2077 /* If a matching external declaration has been found, set its
2078 type to the composite of all the types of that declaration.
2079 After the consistency checks, it will be reset to the
2080 composite of the visible types only. */
2081 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2083 TREE_TYPE (b->decl) = b->type;
2085 /* The point of the same_translation_unit_p check here is,
2086 we want to detect a duplicate decl for a construct like
2087 foo() { extern bar(); } ... static bar(); but not if
2088 they are in different translation units. In any case,
2089 the static does not go in the externals scope. */
2091 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2092 && duplicate_decls (x, b->decl))
2095 thistype = (vistype ? composite_type (vistype, type) : type);
2096 b->type = TREE_TYPE (b->decl);
2097 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2099 = build_type_attribute_variant (thistype,
2100 TYPE_ATTRIBUTES (b->type));
2101 TREE_TYPE (b->decl) = thistype;
2102 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2105 else if (TREE_PUBLIC (x))
2107 if (visdecl && !b && duplicate_decls (x, visdecl))
2109 /* An external declaration at block scope referring to a
2110 visible entity with internal linkage. The composite
2111 type will already be correct for this scope, so we
2112 just need to fall through to make the declaration in
2119 bind (name, x, external_scope, /*invisible=*/true,
2126 warn_if_shadowing (x);
2128 skip_external_and_shadow_checks:
2129 if (TREE_CODE (x) == TYPE_DECL)
2130 clone_underlying_type (x);
2132 bind (name, x, scope, /*invisible=*/false, nested);
2134 /* If x's type is incomplete because it's based on a
2135 structure or union which has not yet been fully declared,
2136 attach it to that structure or union type, so we can go
2137 back and complete the variable declaration later, if the
2138 structure or union gets fully declared.
2140 If the input is erroneous, we can have error_mark in the type
2141 slot (e.g. "f(void a, ...)") - that doesn't count as an
2143 if (TREE_TYPE (x) != error_mark_node
2144 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2146 tree element = TREE_TYPE (x);
2148 while (TREE_CODE (element) == ARRAY_TYPE)
2149 element = TREE_TYPE (element);
2150 element = TYPE_MAIN_VARIANT (element);
2152 if ((TREE_CODE (element) == RECORD_TYPE
2153 || TREE_CODE (element) == UNION_TYPE)
2154 && (TREE_CODE (x) != TYPE_DECL
2155 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2156 && !COMPLETE_TYPE_P (element))
2157 C_TYPE_INCOMPLETE_VARS (element)
2158 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2163 /* Record X as belonging to file scope.
2164 This is used only internally by the Objective-C front end,
2165 and is limited to its needs. duplicate_decls is not called;
2166 if there is any preexisting decl for this identifier, it is an ICE. */
2169 pushdecl_top_level (tree x)
2172 bool nested = false;
2173 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2175 name = DECL_NAME (x);
2177 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2179 if (TREE_PUBLIC (x))
2181 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2185 bind (name, x, file_scope, /*invisible=*/false, nested);
2191 implicit_decl_warning (tree id, tree olddecl)
2193 void (*diag) (const char *, ...);
2194 switch (mesg_implicit_function_declaration)
2197 case 1: diag = warning; break;
2198 case 2: diag = error; break;
2199 default: gcc_unreachable ();
2202 diag (N_("implicit declaration of function %qE"), id);
2204 locate_old_decl (olddecl, diag);
2207 /* Generate an implicit declaration for identifier FUNCTIONID as a
2208 function of type int (). */
2211 implicitly_declare (tree functionid)
2213 struct c_binding *b;
2217 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2219 if (B_IN_SCOPE (b, external_scope))
2228 if (decl == error_mark_node)
2231 /* FIXME: Objective-C has weird not-really-builtin functions
2232 which are supposed to be visible automatically. They wind up
2233 in the external scope because they're pushed before the file
2234 scope gets created. Catch this here and rebind them into the
2236 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2238 bind (functionid, decl, file_scope,
2239 /*invisible=*/false, /*nested=*/true);
2244 tree newtype = default_function_type;
2246 TREE_TYPE (decl) = b->type;
2247 /* Implicit declaration of a function already declared
2248 (somehow) in a different scope, or as a built-in.
2249 If this is the first time this has happened, warn;
2250 then recycle the old declaration but with the new type. */
2251 if (!C_DECL_IMPLICIT (decl))
2253 implicit_decl_warning (functionid, decl);
2254 C_DECL_IMPLICIT (decl) = 1;
2256 if (DECL_BUILT_IN (decl))
2258 newtype = build_type_attribute_variant (newtype,
2260 (TREE_TYPE (decl)));
2261 if (!comptypes (newtype, TREE_TYPE (decl)))
2263 warning ("incompatible implicit declaration of built-in"
2264 " function %qD", decl);
2265 newtype = TREE_TYPE (decl);
2270 if (!comptypes (newtype, TREE_TYPE (decl)))
2272 error ("incompatible implicit declaration of function %qD",
2274 locate_old_decl (decl, error);
2277 b->type = TREE_TYPE (decl);
2278 TREE_TYPE (decl) = newtype;
2279 bind (functionid, decl, current_scope,
2280 /*invisible=*/false, /*nested=*/true);
2285 /* Not seen before. */
2286 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2287 DECL_EXTERNAL (decl) = 1;
2288 TREE_PUBLIC (decl) = 1;
2289 C_DECL_IMPLICIT (decl) = 1;
2290 implicit_decl_warning (functionid, 0);
2291 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2293 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2295 /* C89 says implicit declarations are in the innermost block.
2296 So we record the decl in the standard fashion. */
2297 decl = pushdecl (decl);
2299 /* No need to call objc_check_decl here - it's a function type. */
2300 rest_of_decl_compilation (decl, 0, 0);
2302 /* Write a record describing this implicit function declaration
2303 to the prototypes file (if requested). */
2304 gen_aux_info_record (decl, 0, 1, 0);
2306 /* Possibly apply some default attributes to this implicit declaration. */
2307 decl_attributes (&decl, NULL_TREE, 0);
2312 /* Issue an error message for a reference to an undeclared variable
2313 ID, including a reference to a builtin outside of function-call
2314 context. Establish a binding of the identifier to error_mark_node
2315 in an appropriate scope, which will suppress further errors for the
2316 same identifier. The error message should be given location LOC. */
2318 undeclared_variable (tree id, location_t loc)
2320 static bool already = false;
2321 struct c_scope *scope;
2323 if (current_function_decl == 0)
2325 error ("%H%qE undeclared here (not in a function)", &loc, id);
2326 scope = current_scope;
2330 error ("%H%qE undeclared (first use in this function)", &loc, id);
2334 error ("%H(Each undeclared identifier is reported only once", &loc);
2335 error ("%Hfor each function it appears in.)", &loc);
2339 /* If we are parsing old-style parameter decls, current_function_decl
2340 will be nonnull but current_function_scope will be null. */
2341 scope = current_function_scope ? current_function_scope : current_scope;
2343 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2346 /* Subroutine of lookup_label, declare_label, define_label: construct a
2347 LABEL_DECL with all the proper frills. */
2350 make_label (tree name, location_t location)
2352 tree label = build_decl (LABEL_DECL, name, void_type_node);
2354 DECL_CONTEXT (label) = current_function_decl;
2355 DECL_MODE (label) = VOIDmode;
2356 DECL_SOURCE_LOCATION (label) = location;
2361 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2362 Create one if none exists so far for the current function.
2363 This is called when a label is used in a goto expression or
2364 has its address taken. */
2367 lookup_label (tree name)
2371 if (current_function_decl == 0)
2373 error ("label %qE referenced outside of any function", name);
2377 /* Use a label already defined or ref'd with this name, but not if
2378 it is inherited from a containing function and wasn't declared
2380 label = I_LABEL_DECL (name);
2381 if (label && (DECL_CONTEXT (label) == current_function_decl
2382 || C_DECLARED_LABEL_FLAG (label)))
2384 /* If the label has only been declared, update its apparent
2385 location to point here, for better diagnostics if it
2386 turns out not to have been defined. */
2387 if (!TREE_USED (label))
2388 DECL_SOURCE_LOCATION (label) = input_location;
2392 /* No label binding for that identifier; make one. */
2393 label = make_label (name, input_location);
2395 /* Ordinary labels go in the current function scope. */
2396 bind (name, label, current_function_scope,
2397 /*invisible=*/false, /*nested=*/false);
2401 /* Make a label named NAME in the current function, shadowing silently
2402 any that may be inherited from containing functions or containing
2403 scopes. This is called for __label__ declarations. */
2406 declare_label (tree name)
2408 struct c_binding *b = I_LABEL_BINDING (name);
2411 /* Check to make sure that the label hasn't already been declared
2413 if (b && B_IN_CURRENT_SCOPE (b))
2415 error ("duplicate label declaration %qE", name);
2416 locate_old_decl (b->decl, error);
2418 /* Just use the previous declaration. */
2422 label = make_label (name, input_location);
2423 C_DECLARED_LABEL_FLAG (label) = 1;
2425 /* Declared labels go in the current scope. */
2426 bind (name, label, current_scope,
2427 /*invisible=*/false, /*nested=*/false);
2431 /* Define a label, specifying the location in the source file.
2432 Return the LABEL_DECL node for the label, if the definition is valid.
2433 Otherwise return 0. */
2436 define_label (location_t location, tree name)
2438 /* Find any preexisting label with this name. It is an error
2439 if that label has already been defined in this function, or
2440 if there is a containing function with a declared label with
2442 tree label = I_LABEL_DECL (name);
2445 && ((DECL_CONTEXT (label) == current_function_decl
2446 && DECL_INITIAL (label) != 0)
2447 || (DECL_CONTEXT (label) != current_function_decl
2448 && C_DECLARED_LABEL_FLAG (label))))
2450 error ("%Hduplicate label %qD", &location, label);
2451 locate_old_decl (label, error);
2454 else if (label && DECL_CONTEXT (label) == current_function_decl)
2456 /* The label has been used or declared already in this function,
2457 but not defined. Update its location to point to this
2459 DECL_SOURCE_LOCATION (label) = location;
2463 /* No label binding for that identifier; make one. */
2464 label = make_label (name, location);
2466 /* Ordinary labels go in the current function scope. */
2467 bind (name, label, current_function_scope,
2468 /*invisible=*/false, /*nested=*/false);
2471 if (warn_traditional && !in_system_header && lookup_name (name))
2472 warning ("%Htraditional C lacks a separate namespace for labels, "
2473 "identifier %qE conflicts", &location, name);
2475 /* Mark label as having been defined. */
2476 DECL_INITIAL (label) = error_mark_node;
2480 /* Given NAME, an IDENTIFIER_NODE,
2481 return the structure (or union or enum) definition for that name.
2482 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2483 CODE says which kind of type the caller wants;
2484 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2485 If the wrong kind of type is found, an error is reported. */
2488 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2490 struct c_binding *b = I_TAG_BINDING (name);
2496 /* We only care about whether it's in this level if
2497 thislevel_only was set or it might be a type clash. */
2498 if (thislevel_only || TREE_CODE (b->decl) != code)
2500 /* For our purposes, a tag in the external scope is the same as
2501 a tag in the file scope. (Primarily relevant to Objective-C
2502 and its builtin structure tags, which get pushed before the
2503 file scope is created.) */
2504 if (B_IN_CURRENT_SCOPE (b)
2505 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2509 if (thislevel_only && !thislevel)
2512 if (TREE_CODE (b->decl) != code)
2514 /* Definition isn't the kind we were looking for. */
2515 pending_invalid_xref = name;
2516 pending_invalid_xref_location = input_location;
2518 /* If in the same binding level as a declaration as a tag
2519 of a different type, this must not be allowed to
2520 shadow that tag, so give the error immediately.
2521 (For example, "struct foo; union foo;" is invalid.) */
2523 pending_xref_error ();
2528 /* Print an error message now
2529 for a recent invalid struct, union or enum cross reference.
2530 We don't print them immediately because they are not invalid
2531 when used in the `struct foo;' construct for shadowing. */
2534 pending_xref_error (void)
2536 if (pending_invalid_xref != 0)
2537 error ("%H%qE defined as wrong kind of tag",
2538 &pending_invalid_xref_location, pending_invalid_xref);
2539 pending_invalid_xref = 0;
2543 /* Look up NAME in the current scope and its superiors
2544 in the namespace of variables, functions and typedefs.
2545 Return a ..._DECL node of some kind representing its definition,
2546 or return 0 if it is undefined. */
2549 lookup_name (tree name)
2551 struct c_binding *b = I_SYMBOL_BINDING (name);
2552 if (b && !b->invisible)
2557 /* Similar to `lookup_name' but look only at the indicated scope. */
2560 lookup_name_in_scope (tree name, struct c_scope *scope)
2562 struct c_binding *b;
2564 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2565 if (B_IN_SCOPE (b, scope))
2570 /* Create the predefined scalar types of C,
2571 and some nodes representing standard constants (0, 1, (void *) 0).
2572 Initialize the global scope.
2573 Make definitions for built-in primitive functions. */
2576 c_init_decl_processing (void)
2578 location_t save_loc = input_location;
2580 /* Initialize reserved words for parser. */
2583 current_function_decl = 0;
2585 gcc_obstack_init (&parser_obstack);
2587 /* Make the externals scope. */
2589 external_scope = current_scope;
2591 /* Declarations from c_common_nodes_and_builtins must not be associated
2592 with this input file, lest we get differences between using and not
2593 using preprocessed headers. */
2594 #ifdef USE_MAPPED_LOCATION
2595 input_location = BUILTINS_LOCATION;
2597 input_location.file = "<built-in>";
2598 input_location.line = 0;
2601 build_common_tree_nodes (flag_signed_char, false);
2603 c_common_nodes_and_builtins ();
2605 /* In C, comparisons and TRUTH_* expressions have type int. */
2606 truthvalue_type_node = integer_type_node;
2607 truthvalue_true_node = integer_one_node;
2608 truthvalue_false_node = integer_zero_node;
2610 /* Even in C99, which has a real boolean type. */
2611 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2612 boolean_type_node));
2614 input_location = save_loc;
2616 pedantic_lvalues = true;
2618 make_fname_decl = c_make_fname_decl;
2619 start_fname_decls ();
2622 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2623 decl, NAME is the initialization string and TYPE_DEP indicates whether
2624 NAME depended on the type of the function. As we don't yet implement
2625 delayed emission of static data, we mark the decl as emitted
2626 so it is not placed in the output. Anything using it must therefore pull
2627 out the STRING_CST initializer directly. FIXME. */
2630 c_make_fname_decl (tree id, int type_dep)
2632 const char *name = fname_as_string (type_dep);
2633 tree decl, type, init;
2634 size_t length = strlen (name);
2636 type = build_array_type (char_type_node,
2637 build_index_type (size_int (length)));
2638 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2640 decl = build_decl (VAR_DECL, id, type);
2642 TREE_STATIC (decl) = 1;
2643 TREE_READONLY (decl) = 1;
2644 DECL_ARTIFICIAL (decl) = 1;
2646 init = build_string (length + 1, name);
2647 free ((char *) name);
2648 TREE_TYPE (init) = type;
2649 DECL_INITIAL (decl) = init;
2651 TREE_USED (decl) = 1;
2653 if (current_function_decl)
2655 DECL_CONTEXT (decl) = current_function_decl;
2656 bind (id, decl, current_function_scope,
2657 /*invisible=*/false, /*nested=*/false);
2660 finish_decl (decl, init, NULL_TREE);
2665 /* Return a definition for a builtin function named NAME and whose data type
2666 is TYPE. TYPE should be a function type with argument types.
2667 FUNCTION_CODE tells later passes how to compile calls to this function.
2668 See tree.h for its possible values.
2670 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2671 the name to be called if we can't opencode the function. If
2672 ATTRS is nonzero, use that for the function's attribute list. */
2675 builtin_function (const char *name, tree type, int function_code,
2676 enum built_in_class cl, const char *library_name,
2679 tree id = get_identifier (name);
2680 tree decl = build_decl (FUNCTION_DECL, id, type);
2681 TREE_PUBLIC (decl) = 1;
2682 DECL_EXTERNAL (decl) = 1;
2683 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2684 DECL_BUILT_IN_CLASS (decl) = cl;
2685 DECL_FUNCTION_CODE (decl) = function_code;
2687 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2689 /* Should never be called on a symbol with a preexisting meaning. */
2690 gcc_assert (!I_SYMBOL_BINDING (id));
2692 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2694 /* Builtins in the implementation namespace are made visible without
2695 needing to be explicitly declared. See push_file_scope. */
2696 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2698 TREE_CHAIN (decl) = visible_builtins;
2699 visible_builtins = decl;
2702 /* Possibly apply some default attributes to this built-in function. */
2704 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2706 decl_attributes (&decl, NULL_TREE, 0);
2711 /* Called when a declaration is seen that contains no names to declare.
2712 If its type is a reference to a structure, union or enum inherited
2713 from a containing scope, shadow that tag name for the current scope
2714 with a forward reference.
2715 If its type defines a new named structure or union
2716 or defines an enum, it is valid but we need not do anything here.
2717 Otherwise, it is an error. */
2720 shadow_tag (const struct c_declspecs *declspecs)
2722 shadow_tag_warned (declspecs, 0);
2725 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2728 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2730 bool found_tag = false;
2732 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2734 tree value = declspecs->type;
2735 enum tree_code code = TREE_CODE (value);
2737 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2738 /* Used to test also that TYPE_SIZE (value) != 0.
2739 That caused warning for `struct foo;' at top level in the file. */
2741 tree name = TYPE_NAME (value);
2748 if (warned != 1 && code != ENUMERAL_TYPE)
2749 /* Empty unnamed enum OK */
2751 pedwarn ("unnamed struct/union that defines no instances");
2755 else if (!declspecs->tag_defined_p
2756 && declspecs->storage_class != csc_none)
2759 pedwarn ("empty declaration with storage class specifier "
2760 "does not redeclare tag");
2762 pending_xref_error ();
2764 else if (!declspecs->tag_defined_p
2765 && (declspecs->const_p
2766 || declspecs->volatile_p
2767 || declspecs->restrict_p))
2770 pedwarn ("empty declaration with type qualifier "
2771 "does not redeclare tag");
2773 pending_xref_error ();
2777 pending_invalid_xref = 0;
2778 t = lookup_tag (code, name, 1);
2782 t = make_node (code);
2789 if (warned != 1 && !in_system_header)
2791 pedwarn ("useless type name in empty declaration");
2796 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2798 pedwarn ("useless type name in empty declaration");
2802 pending_invalid_xref = 0;
2804 if (declspecs->inline_p)
2806 error ("%<inline%> in empty declaration");
2810 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2812 error ("%<auto%> in file-scope empty declaration");
2816 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2818 error ("%<register%> in file-scope empty declaration");
2822 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2824 warning ("useless storage class specifier in empty declaration");
2828 if (!warned && !in_system_header && declspecs->thread_p)
2830 warning ("useless %<__thread%> in empty declaration");
2834 if (!warned && !in_system_header && (declspecs->const_p
2835 || declspecs->volatile_p
2836 || declspecs->restrict_p))
2838 warning ("useless type qualifier in empty declaration");
2845 pedwarn ("empty declaration");
2850 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2851 bits. SPECS represents declaration specifiers that the grammar
2852 only permits to contain type qualifiers and attributes. */
2855 quals_from_declspecs (const struct c_declspecs *specs)
2857 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2858 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2859 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2860 gcc_assert (!specs->type
2861 && !specs->decl_attr
2862 && specs->typespec_word == cts_none
2863 && specs->storage_class == csc_none
2864 && !specs->typedef_p
2865 && !specs->explicit_signed_p
2866 && !specs->deprecated_p
2868 && !specs->long_long_p
2871 && !specs->unsigned_p
2872 && !specs->complex_p
2874 && !specs->thread_p);
2878 /* Construct an array declarator. EXPR is the expression inside [], or
2879 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2880 to the pointer to which a parameter array is converted). STATIC_P is
2881 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2882 is true if the array is [*], a VLA of unspecified length which is
2883 nevertheless a complete type (not currently implemented by GCC),
2884 false otherwise. The field for the contained declarator is left to be
2885 filled in by set_array_declarator_inner. */
2887 struct c_declarator *
2888 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
2891 struct c_declarator *declarator = XOBNEW (&parser_obstack,
2892 struct c_declarator);
2893 declarator->kind = cdk_array;
2894 declarator->declarator = 0;
2895 declarator->u.array.dimen = expr;
2898 declarator->u.array.attrs = quals->attrs;
2899 declarator->u.array.quals = quals_from_declspecs (quals);
2903 declarator->u.array.attrs = NULL_TREE;
2904 declarator->u.array.quals = 0;
2906 declarator->u.array.static_p = static_p;
2907 declarator->u.array.vla_unspec_p = vla_unspec_p;
2908 if (pedantic && !flag_isoc99)
2910 if (static_p || quals != NULL)
2911 pedwarn ("ISO C90 does not support %<static%> or type "
2912 "qualifiers in parameter array declarators");
2914 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
2917 warning ("GCC does not yet properly implement %<[*]%> array declarators");
2921 /* Set the contained declarator of an array declarator. DECL is the
2922 declarator, as constructed by build_array_declarator; INNER is what
2923 appears on the left of the []. ABSTRACT_P is true if it is an
2924 abstract declarator, false otherwise; this is used to reject static
2925 and type qualifiers in abstract declarators, where they are not in
2926 the C99 grammar (subject to possible change in DR#289). */
2928 struct c_declarator *
2929 set_array_declarator_inner (struct c_declarator *decl,
2930 struct c_declarator *inner, bool abstract_p)
2932 decl->declarator = inner;
2933 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
2934 || decl->u.array.attrs != NULL_TREE
2935 || decl->u.array.static_p))
2936 error ("static or type qualifiers in abstract declarator");
2940 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2943 groktypename (struct c_type_name *type_name)
2946 tree attrs = type_name->specs->attrs;
2948 type_name->specs->attrs = NULL_TREE;
2950 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
2953 /* Apply attributes. */
2954 decl_attributes (&type, attrs, 0);
2959 /* Decode a declarator in an ordinary declaration or data definition.
2960 This is called as soon as the type information and variable name
2961 have been parsed, before parsing the initializer if any.
2962 Here we create the ..._DECL node, fill in its type,
2963 and put it on the list of decls for the current context.
2964 The ..._DECL node is returned as the value.
2966 Exception: for arrays where the length is not specified,
2967 the type is left null, to be filled in by `finish_decl'.
2969 Function definitions do not come here; they go to start_function
2970 instead. However, external and forward declarations of functions
2971 do go through here. Structure field declarations are done by
2972 grokfield and not through here. */
2975 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
2976 bool initialized, tree attributes)
2981 /* An object declared as __attribute__((deprecated)) suppresses
2982 warnings of uses of other deprecated items. */
2983 if (lookup_attribute ("deprecated", attributes))
2984 deprecated_state = DEPRECATED_SUPPRESS;
2986 decl = grokdeclarator (declarator, declspecs,
2987 NORMAL, initialized, NULL);
2991 deprecated_state = DEPRECATED_NORMAL;
2993 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2994 && MAIN_NAME_P (DECL_NAME (decl)))
2995 warning ("%J%qD is usually a function", decl, decl);
2998 /* Is it valid for this decl to have an initializer at all?
2999 If not, set INITIALIZED to zero, which will indirectly
3000 tell 'finish_decl' to ignore the initializer once it is parsed. */
3001 switch (TREE_CODE (decl))
3004 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3009 error ("function %qD is initialized like a variable", decl);
3014 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3015 error ("parameter %qD is initialized", decl);
3020 /* Don't allow initializations for incomplete types except for
3021 arrays which might be completed by the initialization. */
3023 /* This can happen if the array size is an undefined macro.
3024 We already gave a warning, so we don't need another one. */
3025 if (TREE_TYPE (decl) == error_mark_node)
3027 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3029 /* A complete type is ok if size is fixed. */
3031 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3032 || C_DECL_VARIABLE_SIZE (decl))
3034 error ("variable-sized object may not be initialized");
3038 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3040 error ("variable %qD has initializer but incomplete type", decl);
3043 else if (C_DECL_VARIABLE_SIZE (decl))
3045 /* Although C99 is unclear about whether incomplete arrays
3046 of VLAs themselves count as VLAs, it does not make
3047 sense to permit them to be initialized given that
3048 ordinary VLAs may not be initialized. */
3049 error ("variable-sized object may not be initialized");
3056 if (current_scope == file_scope)
3057 TREE_STATIC (decl) = 1;
3059 /* Tell 'pushdecl' this is an initialized decl
3060 even though we don't yet have the initializer expression.
3061 Also tell 'finish_decl' it may store the real initializer. */
3062 DECL_INITIAL (decl) = error_mark_node;
3065 /* If this is a function declaration, write a record describing it to the
3066 prototypes file (if requested). */
3068 if (TREE_CODE (decl) == FUNCTION_DECL)
3069 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3071 /* ANSI specifies that a tentative definition which is not merged with
3072 a non-tentative definition behaves exactly like a definition with an
3073 initializer equal to zero. (Section 3.7.2)
3075 -fno-common gives strict ANSI behavior, though this tends to break
3076 a large body of code that grew up without this rule.
3078 Thread-local variables are never common, since there's no entrenched
3079 body of code to break, and it allows more efficient variable references
3080 in the presence of dynamic linking. */
3082 if (TREE_CODE (decl) == VAR_DECL
3084 && TREE_PUBLIC (decl)
3085 && !DECL_THREAD_LOCAL (decl)
3087 DECL_COMMON (decl) = 1;
3089 /* Set attributes here so if duplicate decl, will have proper attributes. */
3090 decl_attributes (&decl, attributes, 0);
3092 if (TREE_CODE (decl) == FUNCTION_DECL
3093 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3095 struct c_declarator *ce = declarator;
3097 if (ce->kind == cdk_pointer)
3098 ce = declarator->declarator;
3099 if (ce->kind == cdk_function)
3101 tree args = ce->u.arg_info->parms;
3102 for (; args; args = TREE_CHAIN (args))
3104 tree type = TREE_TYPE (args);
3105 if (type && INTEGRAL_TYPE_P (type)
3106 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3107 DECL_ARG_TYPE (args) = integer_type_node;
3112 if (TREE_CODE (decl) == FUNCTION_DECL
3113 && DECL_DECLARED_INLINE_P (decl)
3114 && DECL_UNINLINABLE (decl)
3115 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3116 warning ("%Jinline function %qD given attribute noinline", decl, decl);
3118 /* Add this decl to the current scope.
3119 TEM may equal DECL or it may be a previous decl of the same name. */
3120 tem = pushdecl (decl);
3122 if (initialized && DECL_EXTERNAL (tem))
3124 DECL_EXTERNAL (tem) = 0;
3125 TREE_STATIC (tem) = 1;
3131 /* Finish processing of a declaration;
3132 install its initial value.
3133 If the length of an array type is not known before,
3134 it must be determined now, from the initial value, or it is an error. */
3137 finish_decl (tree decl, tree init, tree asmspec_tree)
3139 tree type = TREE_TYPE (decl);
3140 int was_incomplete = (DECL_SIZE (decl) == 0);
3141 const char *asmspec = 0;
3143 /* If a name was specified, get the string. */
3144 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3145 && DECL_FILE_SCOPE_P (decl))
3146 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3148 asmspec = TREE_STRING_POINTER (asmspec_tree);
3150 /* If `start_decl' didn't like having an initialization, ignore it now. */
3151 if (init != 0 && DECL_INITIAL (decl) == 0)
3154 /* Don't crash if parm is initialized. */
3155 if (TREE_CODE (decl) == PARM_DECL)
3159 store_init_value (decl, init);
3161 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3162 || TREE_CODE (decl) == FUNCTION_DECL
3163 || TREE_CODE (decl) == FIELD_DECL))
3164 objc_check_decl (decl);
3166 /* Deduce size of array from initialization, if not already known. */
3167 if (TREE_CODE (type) == ARRAY_TYPE
3168 && TYPE_DOMAIN (type) == 0
3169 && TREE_CODE (decl) != TYPE_DECL)
3172 = (TREE_STATIC (decl)
3173 /* Even if pedantic, an external linkage array
3174 may have incomplete type at first. */
3175 ? pedantic && !TREE_PUBLIC (decl)
3176 : !DECL_EXTERNAL (decl));
3178 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3180 /* Get the completed type made by complete_array_type. */
3181 type = TREE_TYPE (decl);
3184 error ("%Jinitializer fails to determine size of %qD", decl, decl);
3186 else if (failure == 2)
3189 error ("%Jarray size missing in %qD", decl, decl);
3190 /* If a `static' var's size isn't known,
3191 make it extern as well as static, so it does not get
3193 If it is not `static', then do not mark extern;
3194 finish_incomplete_decl will give it a default size
3195 and it will get allocated. */
3196 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3197 DECL_EXTERNAL (decl) = 1;
3200 /* TYPE_MAX_VALUE is always one less than the number of elements
3201 in the array, because we start counting at zero. Therefore,
3202 warn only if the value is less than zero. */
3203 else if (pedantic && TYPE_DOMAIN (type) != 0
3204 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3205 error ("%Jzero or negative size array %qD", decl, decl);
3207 layout_decl (decl, 0);
3210 if (TREE_CODE (decl) == VAR_DECL)
3212 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3213 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3214 layout_decl (decl, 0);
3216 if (DECL_SIZE (decl) == 0
3217 /* Don't give an error if we already gave one earlier. */
3218 && TREE_TYPE (decl) != error_mark_node
3219 && (TREE_STATIC (decl)
3220 /* A static variable with an incomplete type
3221 is an error if it is initialized.
3222 Also if it is not file scope.
3223 Otherwise, let it through, but if it is not `extern'
3224 then it may cause an error message later. */
3225 ? (DECL_INITIAL (decl) != 0
3226 || !DECL_FILE_SCOPE_P (decl))
3227 /* An automatic variable with an incomplete type
3229 : !DECL_EXTERNAL (decl)))
3231 error ("%Jstorage size of %qD isn%'t known", decl, decl);
3232 TREE_TYPE (decl) = error_mark_node;
3235 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3236 && DECL_SIZE (decl) != 0)
3238 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3239 constant_expression_warning (DECL_SIZE (decl));
3241 error ("%Jstorage size of %qD isn%'t constant", decl, decl);
3244 if (TREE_USED (type))
3245 TREE_USED (decl) = 1;
3248 /* If this is a function and an assembler name is specified, reset DECL_RTL
3249 so we can give it its new name. Also, update built_in_decls if it
3250 was a normal built-in. */
3251 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3253 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3254 set_builtin_user_assembler_name (decl, asmspec);
3255 set_user_assembler_name (decl, asmspec);
3258 /* If #pragma weak was used, mark the decl weak now. */
3259 if (current_scope == file_scope)
3260 maybe_apply_pragma_weak (decl);
3262 /* If this is a variable definition, determine its ELF visibility. */
3263 if (TREE_CODE (decl) == VAR_DECL
3264 && TREE_STATIC (decl)
3265 && !DECL_EXTERNAL (decl))
3266 c_determine_visibility (decl);
3268 /* Output the assembler code and/or RTL code for variables and functions,
3269 unless the type is an undefined structure or union.
3270 If not, it will get done when the type is completed. */
3272 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3274 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3275 if (c_dialect_objc ())
3276 objc_check_decl (decl);
3280 /* If this is not a static variable, issue a warning.
3281 It doesn't make any sense to give an ASMSPEC for an
3282 ordinary, non-register local variable. Historically,
3283 GCC has accepted -- but ignored -- the ASMSPEC in
3285 if (!DECL_FILE_SCOPE_P (decl)
3286 && TREE_CODE (decl) == VAR_DECL
3287 && !C_DECL_REGISTER (decl)
3288 && !TREE_STATIC (decl))
3289 warning ("%Jignoring asm-specifier for non-static local "
3290 "variable %qD", decl, decl);
3291 else if (C_DECL_REGISTER (decl))
3292 change_decl_assembler_name (decl, get_identifier (asmspec));
3294 set_user_assembler_name (decl, asmspec);
3297 if (DECL_FILE_SCOPE_P (decl))
3299 if (DECL_INITIAL (decl) == NULL_TREE
3300 || DECL_INITIAL (decl) == error_mark_node)
3301 /* Don't output anything
3302 when a tentative file-scope definition is seen.
3303 But at end of compilation, do output code for them. */
3304 DECL_DEFER_OUTPUT (decl) = 1;
3305 rest_of_decl_compilation (decl, true, 0);
3309 /* In conjunction with an ASMSPEC, the `register'
3310 keyword indicates that we should place the variable
3311 in a particular register. */
3312 if (asmspec && C_DECL_REGISTER (decl))
3314 DECL_HARD_REGISTER (decl) = 1;
3315 /* This cannot be done for a structure with volatile
3316 fields, on which DECL_REGISTER will have been
3318 if (!DECL_REGISTER (decl))
3319 error ("cannot put object with volatile field into register");
3322 if (TREE_CODE (decl) != FUNCTION_DECL)
3324 /* If we're building a variable sized type, and we might be
3325 reachable other than via the top of the current binding
3326 level, then create a new BIND_EXPR so that we deallocate
3327 the object at the right time. */
3328 /* Note that DECL_SIZE can be null due to errors. */
3329 if (DECL_SIZE (decl)
3330 && !TREE_CONSTANT (DECL_SIZE (decl))
3331 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3334 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3335 TREE_SIDE_EFFECTS (bind) = 1;
3337 BIND_EXPR_BODY (bind) = push_stmt_list ();
3339 add_stmt (build_stmt (DECL_EXPR, decl));
3344 if (!DECL_FILE_SCOPE_P (decl))
3346 /* Recompute the RTL of a local array now
3347 if it used to be an incomplete type. */
3349 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3351 /* If we used it already as memory, it must stay in memory. */
3352 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3353 /* If it's still incomplete now, no init will save it. */
3354 if (DECL_SIZE (decl) == 0)
3355 DECL_INITIAL (decl) = 0;
3360 /* If this was marked 'used', be sure it will be output. */
3361 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3362 mark_decl_referenced (decl);
3364 if (TREE_CODE (decl) == TYPE_DECL)
3366 if (!DECL_FILE_SCOPE_P (decl)
3367 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3368 add_stmt (build_stmt (DECL_EXPR, decl));
3370 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3373 /* At the end of a declaration, throw away any variable type sizes
3374 of types defined inside that declaration. There is no use
3375 computing them in the following function definition. */
3376 if (current_scope == file_scope)
3377 get_pending_sizes ();
3379 /* Install a cleanup (aka destructor) if one was given. */
3380 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3382 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3385 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3386 tree cleanup_decl = lookup_name (cleanup_id);
3389 /* Build "cleanup(&decl)" for the destructor. */
3390 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3391 cleanup = build_tree_list (NULL_TREE, cleanup);
3392 cleanup = build_function_call (cleanup_decl, cleanup);
3394 /* Don't warn about decl unused; the cleanup uses it. */
3395 TREE_USED (decl) = 1;
3396 TREE_USED (cleanup_decl) = 1;
3398 /* Initialize EH, if we've been told to do so. */
3399 if (flag_exceptions && !c_eh_initialized_p)
3401 c_eh_initialized_p = true;
3402 eh_personality_libfunc
3403 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3404 ? "__gcc_personality_sj0"
3405 : "__gcc_personality_v0");
3406 using_eh_for_cleanups ();
3409 push_cleanup (decl, cleanup, false);
3414 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3417 grokparm (const struct c_parm *parm)
3419 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3422 decl_attributes (&decl, parm->attrs, 0);
3427 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3428 and push that on the current scope. */
3431 push_parm_decl (const struct c_parm *parm)
3435 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3436 decl_attributes (&decl, parm->attrs, 0);
3438 decl = pushdecl (decl);
3440 finish_decl (decl, NULL_TREE, NULL_TREE);
3443 /* Mark all the parameter declarations to date as forward decls.
3444 Also diagnose use of this extension. */
3447 mark_forward_parm_decls (void)
3449 struct c_binding *b;
3451 if (pedantic && !current_scope->warned_forward_parm_decls)
3453 pedwarn ("ISO C forbids forward parameter declarations");
3454 current_scope->warned_forward_parm_decls = true;
3457 for (b = current_scope->bindings; b; b = b->prev)
3458 if (TREE_CODE (b->decl) == PARM_DECL)
3459 TREE_ASM_WRITTEN (b->decl) = 1;
3462 static GTY(()) int compound_literal_number;
3464 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3465 literal, which may be an incomplete array type completed by the
3466 initializer; INIT is a CONSTRUCTOR that initializes the compound
3470 build_compound_literal (tree type, tree init)
3472 /* We do not use start_decl here because we have a type, not a declarator;
3473 and do not use finish_decl because the decl should be stored inside
3474 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3479 if (type == error_mark_node)
3480 return error_mark_node;
3482 decl = build_decl (VAR_DECL, NULL_TREE, type);
3483 DECL_EXTERNAL (decl) = 0;
3484 TREE_PUBLIC (decl) = 0;
3485 TREE_STATIC (decl) = (current_scope == file_scope);
3486 DECL_CONTEXT (decl) = current_function_decl;
3487 TREE_USED (decl) = 1;
3488 TREE_TYPE (decl) = type;
3489 TREE_READONLY (decl) = TYPE_READONLY (type);
3490 store_init_value (decl, init);
3492 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3494 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3496 gcc_assert (!failure);
3499 type = TREE_TYPE (decl);
3500 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3501 return error_mark_node;
3503 stmt = build_stmt (DECL_EXPR, decl);
3504 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3505 TREE_SIDE_EFFECTS (complit) = 1;
3507 layout_decl (decl, 0);
3509 if (TREE_STATIC (decl))
3511 /* This decl needs a name for the assembler output. We also need
3512 a unique suffix to be added to the name. */
3515 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3516 compound_literal_number);
3517 compound_literal_number++;
3518 DECL_NAME (decl) = get_identifier (name);
3519 DECL_DEFER_OUTPUT (decl) = 1;
3520 DECL_COMDAT (decl) = 1;
3521 DECL_ARTIFICIAL (decl) = 1;
3522 DECL_IGNORED_P (decl) = 1;
3524 rest_of_decl_compilation (decl, 1, 0);
3530 /* Make TYPE a complete type based on INITIAL_VALUE.
3531 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3532 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3535 complete_array_type (tree type, tree initial_value, int do_default)
3537 tree maxindex = NULL_TREE;
3542 /* Note MAXINDEX is really the maximum index,
3543 one less than the size. */
3544 if (TREE_CODE (initial_value) == STRING_CST)
3547 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3548 maxindex = build_int_cst (NULL_TREE,
3549 (TREE_STRING_LENGTH (initial_value)
3552 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3554 tree elts = CONSTRUCTOR_ELTS (initial_value);
3555 maxindex = build_int_cst (NULL_TREE, -1);
3556 for (; elts; elts = TREE_CHAIN (elts))
3558 if (TREE_PURPOSE (elts))
3559 maxindex = TREE_PURPOSE (elts);
3561 maxindex = fold (build2 (PLUS_EXPR, integer_type_node,
3562 maxindex, integer_one_node));
3567 /* Make an error message unless that happened already. */
3568 if (initial_value != error_mark_node)
3571 /* Prevent further error messages. */
3572 maxindex = build_int_cst (NULL_TREE, 0);
3579 maxindex = build_int_cst (NULL_TREE, 0);
3585 TYPE_DOMAIN (type) = build_index_type (maxindex);
3587 gcc_assert (TREE_TYPE (maxindex));
3590 /* Lay out the type now that we can get the real answer. */
3597 /* Determine whether TYPE is a structure with a flexible array member,
3598 or a union containing such a structure (possibly recursively). */
3601 flexible_array_type_p (tree type)
3604 switch (TREE_CODE (type))
3607 x = TYPE_FIELDS (type);
3610 while (TREE_CHAIN (x) != NULL_TREE)
3612 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3613 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3614 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3615 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3619 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3621 if (flexible_array_type_p (TREE_TYPE (x)))
3630 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3631 replacing with appropriate values if they are invalid. */
3633 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3636 unsigned int max_width;
3637 unsigned HOST_WIDE_INT w;
3638 const char *name = orig_name ? orig_name: _("<anonymous>");
3640 /* Detect and ignore out of range field width and process valid
3642 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3643 || TREE_CODE (*width) != INTEGER_CST)
3645 error ("bit-field %qs width not an integer constant", name);
3646 *width = integer_one_node;
3650 constant_expression_warning (*width);
3651 if (tree_int_cst_sgn (*width) < 0)
3653 error ("negative width in bit-field %qs", name);
3654 *width = integer_one_node;
3656 else if (integer_zerop (*width) && orig_name)
3658 error ("zero width for bit-field %qs", name);
3659 *width = integer_one_node;
3663 /* Detect invalid bit-field type. */
3664 if (TREE_CODE (*type) != INTEGER_TYPE
3665 && TREE_CODE (*type) != BOOLEAN_TYPE
3666 && TREE_CODE (*type) != ENUMERAL_TYPE)
3668 error ("bit-field %qs has invalid type", name);
3669 *type = unsigned_type_node;
3672 type_mv = TYPE_MAIN_VARIANT (*type);
3674 && type_mv != integer_type_node
3675 && type_mv != unsigned_type_node
3676 && type_mv != boolean_type_node)
3677 pedwarn ("type of bit-field %qs is a GCC extension", name);
3679 if (type_mv == boolean_type_node)
3680 max_width = CHAR_TYPE_SIZE;
3682 max_width = TYPE_PRECISION (*type);
3684 if (0 < compare_tree_int (*width, max_width))
3686 error ("width of %qs exceeds its type", name);
3688 *width = build_int_cst (NULL_TREE, w);
3691 w = tree_low_cst (*width, 1);
3693 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3695 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3697 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3698 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3699 warning ("%qs is narrower than values of its type", name);
3703 /* Given declspecs and a declarator,
3704 determine the name and type of the object declared
3705 and construct a ..._DECL node for it.
3706 (In one case we can return a ..._TYPE node instead.
3707 For invalid input we sometimes return 0.)
3709 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3711 DECL_CONTEXT says which syntactic context this declaration is in:
3712 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3713 FUNCDEF for a function definition. Like NORMAL but a few different
3714 error messages in each case. Return value may be zero meaning
3715 this definition is too screwy to try to parse.
3716 PARM for a parameter declaration (either within a function prototype
3717 or before a function body). Make a PARM_DECL, or return void_type_node.
3718 TYPENAME if for a typename (in a cast or sizeof).
3719 Don't make a DECL node; just return the ..._TYPE node.
3720 FIELD for a struct or union field; make a FIELD_DECL.
3721 INITIALIZED is true if the decl has an initializer.
3722 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3723 representing the width of the bit-field.
3725 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3726 It may also be so in the PARM case, for a prototype where the
3727 argument type is specified but not the name.
3729 This function is where the complicated C meanings of `static'
3730 and `extern' are interpreted. */
3733 grokdeclarator (const struct c_declarator *declarator,
3734 struct c_declspecs *declspecs,
3735 enum decl_context decl_context, bool initialized, tree *width)
3737 tree type = declspecs->type;
3738 bool threadp = declspecs->thread_p;
3739 enum c_storage_class storage_class = declspecs->storage_class;
3743 int type_quals = TYPE_UNQUALIFIED;
3744 const char *name, *orig_name;
3745 tree typedef_type = 0;
3746 int funcdef_flag = 0;
3747 bool funcdef_syntax = false;
3748 int size_varies = 0;
3749 tree decl_attr = declspecs->decl_attr;
3750 int array_ptr_quals = TYPE_UNQUALIFIED;
3751 tree array_ptr_attrs = NULL_TREE;
3752 int array_parm_static = 0;
3753 tree returned_attrs = NULL_TREE;
3754 bool bitfield = width != NULL;
3756 struct c_arg_info *arg_info = 0;
3758 if (decl_context == FUNCDEF)
3759 funcdef_flag = 1, decl_context = NORMAL;
3761 /* Look inside a declarator for the name being declared
3762 and get it as a string, for an error message. */
3764 const struct c_declarator *decl = declarator;
3773 funcdef_syntax = (decl->kind == cdk_function);
3774 decl = decl->declarator;
3778 decl = decl->declarator;
3783 name = IDENTIFIER_POINTER (decl->u.id);
3795 /* A function definition's declarator must have the form of
3796 a function declarator. */
3798 if (funcdef_flag && !funcdef_syntax)
3801 /* If this looks like a function definition, make it one,
3802 even if it occurs where parms are expected.
3803 Then store_parm_decls will reject it and not use it as a parm. */
3804 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3805 decl_context = PARM;
3807 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3808 warn_deprecated_use (declspecs->type);
3810 typedef_type = type;
3811 size_varies = C_TYPE_VARIABLE_SIZE (type);
3813 /* Diagnose defaulting to "int". */
3815 if (declspecs->default_int_p && !in_system_header)
3817 /* Issue a warning if this is an ISO C 99 program or if
3818 -Wreturn-type and this is a function, or if -Wimplicit;
3819 prefer the former warning since it is more explicit. */
3820 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3822 warn_about_return_type = 1;
3823 else if (warn_implicit_int || flag_isoc99)
3824 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3827 /* Adjust the type if a bit-field is being declared,
3828 -funsigned-bitfields applied and the type is not explicitly
3830 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
3831 && TREE_CODE (type) == INTEGER_TYPE)
3832 type = c_common_unsigned_type (type);
3834 /* Figure out the type qualifiers for the declaration. There are
3835 two ways a declaration can become qualified. One is something
3836 like `const int i' where the `const' is explicit. Another is
3837 something like `typedef const int CI; CI i' where the type of the
3838 declaration contains the `const'. A third possibility is that
3839 there is a type qualifier on the element type of a typedefed
3840 array type, in which case we should extract that qualifier so
3841 that c_apply_type_quals_to_decls receives the full list of
3842 qualifiers to work with (C90 is not entirely clear about whether
3843 duplicate qualifiers should be diagnosed in this case, but it
3844 seems most appropriate to do so). */
3845 element_type = strip_array_types (type);
3846 constp = declspecs->const_p + TYPE_READONLY (element_type);
3847 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
3848 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
3849 if (pedantic && !flag_isoc99)
3852 pedwarn ("duplicate %<const%>");
3854 pedwarn ("duplicate %<restrict%>");
3856 pedwarn ("duplicate %<volatile%>");
3858 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
3859 type = TYPE_MAIN_VARIANT (type);
3860 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3861 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3862 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3864 /* Warn about storage classes that are invalid for certain
3865 kinds of declarations (parameters, typenames, etc.). */
3869 || storage_class == csc_auto
3870 || storage_class == csc_register
3871 || storage_class == csc_typedef))
3873 if (storage_class == csc_auto
3874 && (pedantic || current_scope == file_scope))
3875 pedwarn ("function definition declared %<auto%>");
3876 if (storage_class == csc_register)
3877 error ("function definition declared %<register%>");
3878 if (storage_class == csc_typedef)
3879 error ("function definition declared %<typedef%>");
3881 error ("function definition declared %<__thread%>");
3883 if (storage_class == csc_auto
3884 || storage_class == csc_register
3885 || storage_class == csc_typedef)
3886 storage_class = csc_none;
3888 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
3890 if (decl_context == PARM && storage_class == csc_register)
3894 switch (decl_context)
3897 error ("storage class specified for structure field %qs",
3901 error ("storage class specified for parameter %qs", name);
3904 error ("storage class specified for typename");
3907 storage_class = csc_none;
3911 else if (storage_class == csc_extern
3915 /* 'extern' with initialization is invalid if not at file scope. */
3916 if (current_scope == file_scope)
3917 warning ("%qs initialized and declared %<extern%>", name);
3919 error ("%qs has both %<extern%> and initializer", name);
3921 else if (current_scope == file_scope)
3923 if (storage_class == csc_auto)
3924 error ("file-scope declaration of %qs specifies %<auto%>", name);
3925 if (pedantic && storage_class == csc_register)
3926 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
3930 if (storage_class == csc_extern && funcdef_flag)
3931 error ("nested function %qs declared %<extern%>", name);
3932 else if (threadp && storage_class == csc_none)
3934 error ("function-scope %qs implicitly auto and declared "
3941 /* Now figure out the structure of the declarator proper.
3942 Descend through it, creating more complex types, until we reach
3943 the declared identifier (or NULL_TREE, in an absolute declarator).
3944 At each stage we maintain an unqualified version of the type
3945 together with any qualifiers that should be applied to it with
3946 c_build_qualified_type; this way, array types including
3947 multidimensional array types are first built up in unqualified
3948 form and then the qualified form is created with
3949 TYPE_MAIN_VARIANT pointing to the unqualified form. */
3951 while (declarator && declarator->kind != cdk_id)
3953 if (type == error_mark_node)
3955 declarator = declarator->declarator;
3959 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
3960 a cdk_pointer (for *...),
3961 a cdk_function (for ...(...)),
3962 a cdk_attrs (for nested attributes),
3963 or a cdk_id (for the name being declared
3964 or the place in an absolute declarator
3965 where the name was omitted).
3966 For the last case, we have just exited the loop.
3968 At this point, TYPE is the type of elements of an array,
3969 or for a function to return, or for a pointer to point to.
3970 After this sequence of ifs, TYPE is the type of the
3971 array or function or pointer, and DECLARATOR has had its
3972 outermost layer removed. */
3974 if (array_ptr_quals != TYPE_UNQUALIFIED
3975 || array_ptr_attrs != NULL_TREE
3976 || array_parm_static)
3978 /* Only the innermost declarator (making a parameter be of
3979 array type which is converted to pointer type)
3980 may have static or type qualifiers. */
3981 error ("static or type qualifiers in non-parameter array declarator");
3982 array_ptr_quals = TYPE_UNQUALIFIED;
3983 array_ptr_attrs = NULL_TREE;
3984 array_parm_static = 0;
3987 switch (declarator->kind)
3991 /* A declarator with embedded attributes. */
3992 tree attrs = declarator->u.attrs;
3993 const struct c_declarator *inner_decl;
3995 declarator = declarator->declarator;
3996 inner_decl = declarator;
3997 while (inner_decl->kind == cdk_attrs)
3998 inner_decl = inner_decl->declarator;
3999 if (inner_decl->kind == cdk_id)
4000 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4001 else if (inner_decl->kind == cdk_function)
4002 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4003 else if (inner_decl->kind == cdk_array)
4004 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4005 returned_attrs = decl_attributes (&type,
4006 chainon (returned_attrs, attrs),
4012 tree itype = NULL_TREE;
4013 tree size = declarator->u.array.dimen;
4014 /* The index is a signed object `sizetype' bits wide. */
4015 tree index_type = c_common_signed_type (sizetype);
4017 array_ptr_quals = declarator->u.array.quals;
4018 array_ptr_attrs = declarator->u.array.attrs;
4019 array_parm_static = declarator->u.array.static_p;
4021 declarator = declarator->declarator;
4023 /* Check for some types that there cannot be arrays of. */
4025 if (VOID_TYPE_P (type))
4027 error ("declaration of %qs as array of voids", name);
4028 type = error_mark_node;
4031 if (TREE_CODE (type) == FUNCTION_TYPE)
4033 error ("declaration of %qs as array of functions", name);
4034 type = error_mark_node;
4037 if (pedantic && !in_system_header && flexible_array_type_p (type))
4038 pedwarn ("invalid use of structure with flexible array member");
4040 if (size == error_mark_node)
4041 type = error_mark_node;
4043 if (type == error_mark_node)
4046 /* If size was specified, set ITYPE to a range-type for
4047 that size. Otherwise, ITYPE remains null. finish_decl
4048 may figure it out from an initial value. */
4052 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4054 STRIP_TYPE_NOPS (size);
4056 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4058 error ("size of array %qs has non-integer type", name);
4059 size = integer_one_node;
4062 if (pedantic && integer_zerop (size))
4063 pedwarn ("ISO C forbids zero-size array %qs", name);
4065 if (TREE_CODE (size) == INTEGER_CST)
4067 constant_expression_warning (size);
4068 if (tree_int_cst_sgn (size) < 0)
4070 error ("size of array %qs is negative", name);
4071 size = integer_one_node;
4076 /* Make sure the array size remains visibly
4077 nonconstant even if it is (eg) a const variable
4078 with known value. */
4081 if (!flag_isoc99 && pedantic)
4083 if (TREE_CONSTANT (size))
4084 pedwarn ("ISO C90 forbids array %qs whose size "
4085 "can%'t be evaluated",
4088 pedwarn ("ISO C90 forbids variable-size array %qs",
4093 if (integer_zerop (size))
4095 /* A zero-length array cannot be represented with
4096 an unsigned index type, which is what we'll
4097 get with build_index_type. Create an
4098 open-ended range instead. */
4099 itype = build_range_type (sizetype, size, NULL_TREE);
4103 /* Arrange for the SAVE_EXPR on the inside of the
4104 MINUS_EXPR, which allows the -1 to get folded
4105 with the +1 that happens when building TYPE_SIZE. */
4107 size = variable_size (size);
4109 /* Compute the maximum valid index, that is, size
4110 - 1. Do the calculation in index_type, so that
4111 if it is a variable the computations will be
4112 done in the proper mode. */
4113 itype = fold (build2 (MINUS_EXPR, index_type,
4114 convert (index_type, size),
4115 convert (index_type,
4118 /* If that overflowed, the array is too big. ???
4119 While a size of INT_MAX+1 technically shouldn't
4120 cause an overflow (because we subtract 1), the
4121 overflow is recorded during the conversion to
4122 index_type, before the subtraction. Handling
4123 this case seems like an unnecessary
4125 if (TREE_OVERFLOW (itype))
4127 error ("size of array %qs is too large", name);
4128 type = error_mark_node;
4132 itype = build_index_type (itype);
4135 else if (decl_context == FIELD)
4137 if (pedantic && !flag_isoc99 && !in_system_header)
4138 pedwarn ("ISO C90 does not support flexible array members");
4140 /* ISO C99 Flexible array members are effectively
4141 identical to GCC's zero-length array extension. */
4142 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4145 /* Complain about arrays of incomplete types. */
4146 if (!COMPLETE_TYPE_P (type))
4148 error ("array type has incomplete element type");
4149 type = error_mark_node;
4152 type = build_array_type (type, itype);
4155 C_TYPE_VARIABLE_SIZE (type) = 1;
4157 /* The GCC extension for zero-length arrays differs from
4158 ISO flexible array members in that sizeof yields
4160 if (size && integer_zerop (size))
4162 TYPE_SIZE (type) = bitsize_zero_node;
4163 TYPE_SIZE_UNIT (type) = size_zero_node;
4166 if (decl_context != PARM
4167 && (array_ptr_quals != TYPE_UNQUALIFIED
4168 || array_ptr_attrs != NULL_TREE
4169 || array_parm_static))
4171 error ("static or type qualifiers in non-parameter array declarator");
4172 array_ptr_quals = TYPE_UNQUALIFIED;
4173 array_ptr_attrs = NULL_TREE;
4174 array_parm_static = 0;
4180 /* Say it's a definition only for the declarator closest
4181 to the identifier, apart possibly from some
4183 bool really_funcdef = false;
4187 const struct c_declarator *t = declarator->declarator;
4188 while (t->kind == cdk_attrs)
4190 really_funcdef = (t->kind == cdk_id);
4193 /* Declaring a function type. Make sure we have a valid
4194 type for the function to return. */
4195 if (type == error_mark_node)
4200 /* Warn about some types functions can't return. */
4201 if (TREE_CODE (type) == FUNCTION_TYPE)
4203 error ("%qs declared as function returning a function", name);
4204 type = integer_type_node;
4206 if (TREE_CODE (type) == ARRAY_TYPE)
4208 error ("%qs declared as function returning an array", name);
4209 type = integer_type_node;
4212 /* Construct the function type and go to the next
4213 inner layer of declarator. */
4214 arg_info = declarator->u.arg_info;
4215 arg_types = grokparms (arg_info, really_funcdef);
4217 /* Type qualifiers before the return type of the function
4218 qualify the return type, not the function type. */
4221 /* Type qualifiers on a function return type are
4222 normally permitted by the standard but have no
4223 effect, so give a warning at -Wreturn-type.
4224 Qualifiers on a void return type are banned on
4225 function definitions in ISO C; GCC used to used
4226 them for noreturn functions. */
4227 if (VOID_TYPE_P (type) && really_funcdef)
4228 pedwarn ("function definition has qualified void return type");
4229 else if (warn_return_type)
4230 warning ("type qualifiers ignored on function return type");
4232 type = c_build_qualified_type (type, type_quals);
4234 type_quals = TYPE_UNQUALIFIED;
4236 type = build_function_type (type, arg_types);
4237 declarator = declarator->declarator;
4239 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4240 the formal parameter list of this FUNCTION_TYPE to point to
4241 the FUNCTION_TYPE node itself. */
4245 for (link = arg_info->tags;
4247 link = TREE_CHAIN (link))
4248 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4254 /* Merge any constancy or volatility into the target type
4257 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4259 pedwarn ("ISO C forbids qualified function types");
4261 type = c_build_qualified_type (type, type_quals);
4264 type = build_pointer_type (type);
4266 /* Process type qualifiers (such as const or volatile)
4267 that were given inside the `*'. */
4268 type_quals = declarator->u.pointer_quals;
4270 declarator = declarator->declarator;
4278 /* Now TYPE has the actual type, apart from any qualifiers in
4281 /* Check the type and width of a bit-field. */
4283 check_bitfield_type_and_width (&type, width, orig_name);
4285 /* Did array size calculations overflow? */
4287 if (TREE_CODE (type) == ARRAY_TYPE
4288 && COMPLETE_TYPE_P (type)
4289 && TREE_OVERFLOW (TYPE_SIZE (type)))
4291 error ("size of array %qs is too large", name);
4292 /* If we proceed with the array type as it is, we'll eventually
4293 crash in tree_low_cst(). */
4294 type = error_mark_node;
4297 /* If this is declaring a typedef name, return a TYPE_DECL. */
4299 if (storage_class == csc_typedef)
4302 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4304 pedwarn ("ISO C forbids qualified function types");
4306 type = c_build_qualified_type (type, type_quals);
4307 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4308 if (declspecs->explicit_signed_p)
4309 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4310 decl_attributes (&decl, returned_attrs, 0);
4311 if (declspecs->inline_p)
4312 pedwarn ("%Jtypedef %qD declared %<inline%>", decl, decl);
4316 /* Detect the case of an array type of unspecified size
4317 which came, as such, direct from a typedef name.
4318 We must copy the type, so that each identifier gets
4319 a distinct type, so that each identifier's size can be
4320 controlled separately by its own initializer. */
4322 if (type != 0 && typedef_type != 0
4323 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4324 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4326 type = build_array_type (TREE_TYPE (type), 0);
4328 C_TYPE_VARIABLE_SIZE (type) = 1;
4331 /* If this is a type name (such as, in a cast or sizeof),
4332 compute the type and return it now. */
4334 if (decl_context == TYPENAME)
4336 /* Note that the grammar rejects storage classes in typenames
4338 gcc_assert (storage_class == csc_none && !threadp
4339 && !declspecs->inline_p);
4340 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4342 pedwarn ("ISO C forbids const or volatile function types");
4344 type = c_build_qualified_type (type, type_quals);
4345 decl_attributes (&type, returned_attrs, 0);
4349 /* Aside from typedefs and type names (handle above),
4350 `void' at top level (not within pointer)
4351 is allowed only in public variables.
4352 We don't complain about parms either, but that is because
4353 a better error message can be made later. */
4355 if (VOID_TYPE_P (type) && decl_context != PARM
4356 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4357 && (storage_class == csc_extern
4358 || (current_scope == file_scope
4359 && !(storage_class == csc_static
4360 || storage_class == csc_register)))))
4362 error ("variable or field %qs declared void", name);
4363 type = integer_type_node;
4366 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4367 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4372 if (decl_context == PARM)
4374 tree type_as_written;
4377 /* A parameter declared as an array of T is really a pointer to T.
4378 One declared as a function is really a pointer to a function. */
4380 if (TREE_CODE (type) == ARRAY_TYPE)
4382 /* Transfer const-ness of array into that of type pointed to. */
4383 type = TREE_TYPE (type);
4385 type = c_build_qualified_type (type, type_quals);
4386 type = build_pointer_type (type);
4387 type_quals = array_ptr_quals;
4389 /* We don't yet implement attributes in this context. */
4390 if (array_ptr_attrs != NULL_TREE)
4391 warning ("attributes in parameter array declarator ignored");
4395 else if (TREE_CODE (type) == FUNCTION_TYPE)
4397 if (pedantic && type_quals)
4398 pedwarn ("ISO C forbids qualified function types");
4400 type = c_build_qualified_type (type, type_quals);
4401 type = build_pointer_type (type);
4402 type_quals = TYPE_UNQUALIFIED;
4404 else if (type_quals)
4405 type = c_build_qualified_type (type, type_quals);
4407 type_as_written = type;
4409 decl = build_decl (PARM_DECL, declarator->u.id, type);
4411 C_DECL_VARIABLE_SIZE (decl) = 1;
4413 /* Compute the type actually passed in the parmlist,
4414 for the case where there is no prototype.
4415 (For example, shorts and chars are passed as ints.)
4416 When there is a prototype, this is overridden later. */
4418 if (type == error_mark_node)
4419 promoted_type = type;
4421 promoted_type = c_type_promotes_to (type);
4423 DECL_ARG_TYPE (decl) = promoted_type;
4424 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4425 if (declspecs->inline_p)
4426 pedwarn ("%Jparameter %qD declared %<inline%>", decl, decl);
4428 else if (decl_context == FIELD)
4430 /* Note that the grammar rejects storage classes in typenames
4432 gcc_assert (storage_class == csc_none && !threadp
4433 && !declspecs->inline_p);
4435 /* Structure field. It may not be a function. */
4437 if (TREE_CODE (type) == FUNCTION_TYPE)
4439 error ("field %qs declared as a function", name);
4440 type = build_pointer_type (type);
4442 else if (TREE_CODE (type) != ERROR_MARK
4443 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4445 error ("field %qs has incomplete type", name);
4446 type = error_mark_node;
4448 type = c_build_qualified_type (type, type_quals);
4449 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4450 DECL_NONADDRESSABLE_P (decl) = bitfield;
4453 C_DECL_VARIABLE_SIZE (decl) = 1;
4455 else if (TREE_CODE (type) == FUNCTION_TYPE)
4457 if (storage_class == csc_register || threadp)
4459 error ("invalid storage class for function %qs", name);
4461 else if (current_scope != file_scope)
4463 /* Function declaration not at file scope. Storage
4464 classes other than `extern' are not allowed, C99
4465 6.7.1p5, and `extern' makes no difference. However,
4466 GCC allows 'auto', perhaps with 'inline', to support
4467 nested functions. */
4468 if (storage_class == csc_auto)
4471 pedwarn ("invalid storage class for function %qs", name);
4473 else if (storage_class == csc_static)
4475 error ("invalid storage class for function %qs", name);
4477 storage_class = declspecs->storage_class = csc_none;
4483 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4484 decl = build_decl_attribute_variant (decl, decl_attr);
4486 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4488 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4489 pedwarn ("ISO C forbids qualified function types");
4491 /* GNU C interprets a volatile-qualified function type to indicate
4492 that the function does not return. */
4493 if ((type_quals & TYPE_QUAL_VOLATILE)
4494 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4495 warning ("%<noreturn%> function returns non-void value");
4497 /* Every function declaration is an external reference
4498 (DECL_EXTERNAL) except for those which are not at file
4499 scope and are explicitly declared "auto". This is
4500 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4501 GCC to signify a forward declaration of a nested function. */
4502 if (storage_class == csc_auto && current_scope != file_scope)
4503 DECL_EXTERNAL (decl) = 0;
4505 DECL_EXTERNAL (decl) = 1;
4507 /* Record absence of global scope for `static' or `auto'. */
4509 = !(storage_class == csc_static || storage_class == csc_auto);
4511 /* For a function definition, record the argument information
4512 block where store_parm_decls will look for it. */
4514 current_function_arg_info = arg_info;
4516 if (declspecs->default_int_p)
4517 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4519 /* Record presence of `inline', if it is reasonable. */
4520 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4522 if (declspecs->inline_p)
4523 pedwarn ("cannot inline function %<main%>");
4525 else if (declspecs->inline_p)
4527 /* Record that the function is declared `inline'. */
4528 DECL_DECLARED_INLINE_P (decl) = 1;
4530 /* Do not mark bare declarations as DECL_INLINE. Doing so
4531 in the presence of multiple declarations can result in
4532 the abstract origin pointing between the declarations,
4533 which will confuse dwarf2out. */
4536 DECL_INLINE (decl) = 1;
4537 if (storage_class == csc_extern)
4538 current_extern_inline = 1;
4541 /* If -finline-functions, assume it can be inlined. This does
4542 two things: let the function be deferred until it is actually
4543 needed, and let dwarf2 know that the function is inlinable. */
4544 else if (flag_inline_trees == 2 && initialized)
4545 DECL_INLINE (decl) = 1;
4549 /* It's a variable. */
4550 /* An uninitialized decl with `extern' is a reference. */
4551 int extern_ref = !initialized && storage_class == csc_extern;
4553 type = c_build_qualified_type (type, type_quals);
4555 /* C99 6.2.2p7: It is invalid (compile-time undefined
4556 behavior) to create an 'extern' declaration for a
4557 variable if there is a global declaration that is
4558 'static' and the global declaration is not visible.
4559 (If the static declaration _is_ currently visible,
4560 the 'extern' declaration is taken to refer to that decl.) */
4561 if (extern_ref && current_scope != file_scope)
4563 tree global_decl = identifier_global_value (declarator->u.id);
4564 tree visible_decl = lookup_name (declarator->u.id);
4567 && global_decl != visible_decl
4568 && TREE_CODE (global_decl) == VAR_DECL
4569 && !TREE_PUBLIC (global_decl))
4570 error ("variable previously declared %<static%> redeclared "
4574 decl = build_decl (VAR_DECL, declarator->u.id, type);
4575 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4577 C_DECL_VARIABLE_SIZE (decl) = 1;
4579 if (declspecs->inline_p)
4580 pedwarn ("%Jvariable %qD declared %<inline%>", decl, decl);
4582 /* At file scope, an initialized extern declaration may follow
4583 a static declaration. In that case, DECL_EXTERNAL will be
4584 reset later in start_decl. */
4585 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4587 /* At file scope, the presence of a `static' or `register' storage
4588 class specifier, or the absence of all storage class specifiers
4589 makes this declaration a definition (perhaps tentative). Also,
4590 the absence of both `static' and `register' makes it public. */
4591 if (current_scope == file_scope)
4593 TREE_PUBLIC (decl) = !(storage_class == csc_static
4594 || storage_class == csc_register);
4595 TREE_STATIC (decl) = !extern_ref;
4597 /* Not at file scope, only `static' makes a static definition. */
4600 TREE_STATIC (decl) = (storage_class == csc_static);
4601 TREE_PUBLIC (decl) = extern_ref;
4606 if (targetm.have_tls)
4607 DECL_THREAD_LOCAL (decl) = 1;
4609 /* A mere warning is sure to result in improper semantics
4610 at runtime. Don't bother to allow this to compile. */
4611 error ("thread-local storage not supported for this target");
4615 /* Record `register' declaration for warnings on &
4616 and in case doing stupid register allocation. */
4618 if (storage_class == csc_register)
4620 C_DECL_REGISTER (decl) = 1;
4621 DECL_REGISTER (decl) = 1;
4624 /* Record constancy and volatility. */
4625 c_apply_type_quals_to_decl (type_quals, decl);
4627 /* If a type has volatile components, it should be stored in memory.
4628 Otherwise, the fact that those components are volatile
4629 will be ignored, and would even crash the compiler. */
4630 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4632 /* It is not an error for a structure with volatile fields to
4633 be declared register, but reset DECL_REGISTER since it
4634 cannot actually go in a register. */
4635 int was_reg = C_DECL_REGISTER (decl);
4636 C_DECL_REGISTER (decl) = 0;
4637 DECL_REGISTER (decl) = 0;
4638 c_mark_addressable (decl);
4639 C_DECL_REGISTER (decl) = was_reg;
4642 /* This is the earliest point at which we might know the assembler
4643 name of a variable. Thus, if it's known before this, die horribly. */
4644 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4646 decl_attributes (&decl, returned_attrs, 0);
4652 /* Decode the parameter-list info for a function type or function definition.
4653 The argument is the value returned by `get_parm_info' (or made in parse.y
4654 if there is an identifier list instead of a parameter decl list).
4655 These two functions are separate because when a function returns
4656 or receives functions then each is called multiple times but the order
4657 of calls is different. The last call to `grokparms' is always the one
4658 that contains the formal parameter names of a function definition.
4660 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4662 FUNCDEF_FLAG is true for a function definition, false for
4663 a mere declaration. A nonempty identifier-list gets an error message
4664 when FUNCDEF_FLAG is false. */
4667 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4669 tree arg_types = arg_info->types;
4671 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4672 && !in_system_header)
4673 warning ("function declaration isn%'t a prototype");
4675 if (arg_types == error_mark_node)
4676 return 0; /* don't set TYPE_ARG_TYPES in this case */
4678 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4681 pedwarn ("parameter names (without types) in function declaration");
4683 arg_info->parms = arg_info->types;
4684 arg_info->types = 0;
4689 tree parm, type, typelt;
4690 unsigned int parmno;
4692 /* If there is a parameter of incomplete type in a definition,
4693 this is an error. In a declaration this is valid, and a
4694 struct or union type may be completed later, before any calls
4695 or definition of the function. In the case where the tag was
4696 first declared within the parameter list, a warning has
4697 already been given. If a parameter has void type, then
4698 however the function cannot be defined or called, so
4701 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4703 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4705 type = TREE_VALUE (typelt);
4706 if (type == error_mark_node)
4709 if (!COMPLETE_TYPE_P (type))
4713 if (DECL_NAME (parm))
4714 error ("%Jparameter %u (%qD) has incomplete type",
4715 parm, parmno, parm);
4717 error ("%Jparameter %u has incomplete type",
4720 TREE_VALUE (typelt) = error_mark_node;
4721 TREE_TYPE (parm) = error_mark_node;
4723 else if (VOID_TYPE_P (type))
4725 if (DECL_NAME (parm))
4726 warning ("%Jparameter %u (%qD) has void type",
4727 parm, parmno, parm);
4729 warning ("%Jparameter %u has void type",
4738 /* Take apart the current scope and return a c_arg_info structure with
4739 info on a parameter list just parsed.
4741 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4743 ELLIPSIS being true means the argument list ended in '...' so don't
4744 append a sentinel (void_list_node) to the end of the type-list. */
4747 get_parm_info (bool ellipsis)
4749 struct c_binding *b = current_scope->bindings;
4750 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4757 static bool explained_incomplete_types = false;
4758 bool gave_void_only_once_err = false;
4760 arg_info->parms = 0;
4762 arg_info->types = 0;
4763 arg_info->others = 0;
4765 /* The bindings in this scope must not get put into a block.
4766 We will take care of deleting the binding nodes. */
4767 current_scope->bindings = 0;
4769 /* This function is only called if there was *something* on the
4773 /* A parameter list consisting solely of 'void' indicates that the
4774 function takes no arguments. But if the 'void' is qualified
4775 (by 'const' or 'volatile'), or has a storage class specifier
4776 ('register'), then the behavior is undefined; issue an error.
4777 Typedefs for 'void' are OK (see DR#157). */
4778 if (b->prev == 0 /* one binding */
4779 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4780 && !DECL_NAME (b->decl) /* anonymous */
4781 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4783 if (TREE_THIS_VOLATILE (b->decl)
4784 || TREE_READONLY (b->decl)
4785 || C_DECL_REGISTER (b->decl))
4786 error ("%<void%> as only parameter may not be qualified");
4788 /* There cannot be an ellipsis. */
4790 error ("%<void%> must be the only parameter");
4792 arg_info->types = void_list_node;
4797 types = void_list_node;
4799 /* Break up the bindings list into parms, tags, types, and others;
4800 apply sanity checks; purge the name-to-decl bindings. */
4803 tree decl = b->decl;
4804 tree type = TREE_TYPE (decl);
4805 const char *keyword;
4807 switch (TREE_CODE (decl))
4812 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4813 I_SYMBOL_BINDING (b->id) = b->shadowed;
4816 /* Check for forward decls that never got their actual decl. */
4817 if (TREE_ASM_WRITTEN (decl))
4818 error ("%Jparameter %qD has just a forward declaration",
4820 /* Check for (..., void, ...) and issue an error. */
4821 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4823 if (!gave_void_only_once_err)
4825 error ("%<void%> must be the only parameter");
4826 gave_void_only_once_err = true;
4831 /* Valid parameter, add it to the list. */
4832 TREE_CHAIN (decl) = parms;
4835 /* Since there is a prototype, args are passed in their
4836 declared types. The back end may override this later. */
4837 DECL_ARG_TYPE (decl) = type;
4838 types = tree_cons (0, type, types);
4842 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4843 case UNION_TYPE: keyword = "union"; goto tag;
4844 case RECORD_TYPE: keyword = "struct"; goto tag;
4846 /* Types may not have tag-names, in which case the type
4847 appears in the bindings list with b->id NULL. */
4850 gcc_assert (I_TAG_BINDING (b->id) == b);
4851 I_TAG_BINDING (b->id) = b->shadowed;
4854 /* Warn about any struct, union or enum tags defined in a
4855 parameter list. The scope of such types is limited to
4856 the parameter list, which is rarely if ever desirable
4857 (it's impossible to call such a function with type-
4858 correct arguments). An anonymous union parm type is
4859 meaningful as a GNU extension, so don't warn for that. */
4860 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4863 /* The %s will be one of 'struct', 'union', or 'enum'. */
4864 warning ("%<%s %E%> declared inside parameter list",
4867 /* The %s will be one of 'struct', 'union', or 'enum'. */
4868 warning ("anonymous %s declared inside parameter list",
4871 if (!explained_incomplete_types)
4873 warning ("its scope is only this definition or declaration,"
4874 " which is probably not what you want");
4875 explained_incomplete_types = true;
4879 tags = tree_cons (b->id, decl, tags);
4885 /* CONST_DECLs appear here when we have an embedded enum,
4886 and TYPE_DECLs appear here when we have an embedded struct
4887 or union. No warnings for this - we already warned about the
4888 type itself. FUNCTION_DECLs appear when there is an implicit
4889 function declaration in the parameter list. */
4891 TREE_CHAIN (decl) = others;
4896 /* error_mark_node appears here when we have an undeclared
4897 variable. Just throw it away. */
4900 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4901 I_SYMBOL_BINDING (b->id) = b->shadowed;
4905 /* Other things that might be encountered. */
4912 b = free_binding_and_advance (b);
4915 arg_info->parms = parms;
4916 arg_info->tags = tags;
4917 arg_info->types = types;
4918 arg_info->others = others;
4922 /* Get the struct, enum or union (CODE says which) with tag NAME.
4923 Define the tag as a forward-reference if it is not defined.
4924 Return a c_typespec structure for the type specifier. */
4927 parser_xref_tag (enum tree_code code, tree name)
4929 struct c_typespec ret;
4930 /* If a cross reference is requested, look up the type
4931 already defined for this tag and return it. */
4933 tree ref = lookup_tag (code, name, 0);
4934 /* If this is the right type of tag, return what we found.
4935 (This reference will be shadowed by shadow_tag later if appropriate.)
4936 If this is the wrong type of tag, do not return it. If it was the
4937 wrong type in the same scope, we will have had an error
4938 message already; if in a different scope and declaring
4939 a name, pending_xref_error will give an error message; but if in a
4940 different scope and not declaring a name, this tag should
4941 shadow the previous declaration of a different type of tag, and
4942 this would not work properly if we return the reference found.
4943 (For example, with "struct foo" in an outer scope, "union foo;"
4944 must shadow that tag with a new one of union type.) */
4945 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
4946 if (ref && TREE_CODE (ref) == code)
4952 /* If no such tag is yet defined, create a forward-reference node
4953 and record it as the "definition".
4954 When a real declaration of this type is found,
4955 the forward-reference will be altered into a real type. */
4957 ref = make_node (code);
4958 if (code == ENUMERAL_TYPE)
4960 /* Give the type a default layout like unsigned int
4961 to avoid crashing if it does not get defined. */
4962 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4963 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4964 TYPE_USER_ALIGN (ref) = 0;
4965 TYPE_UNSIGNED (ref) = 1;
4966 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4967 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4968 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4971 pushtag (name, ref);
4977 /* Get the struct, enum or union (CODE says which) with tag NAME.
4978 Define the tag as a forward-reference if it is not defined.
4979 Return a tree for the type. */
4982 xref_tag (enum tree_code code, tree name)
4984 return parser_xref_tag (code, name).spec;
4987 /* Make sure that the tag NAME is defined *in the current scope*
4988 at least as a forward reference.
4989 CODE says which kind of tag NAME ought to be. */
4992 start_struct (enum tree_code code, tree name)
4994 /* If there is already a tag defined at this scope
4995 (as a forward reference), just return it. */
5000 ref = lookup_tag (code, name, 1);
5001 if (ref && TREE_CODE (ref) == code)
5003 if (TYPE_SIZE (ref))
5005 if (code == UNION_TYPE)
5006 error ("redefinition of %<union %E%>", name);
5008 error ("redefinition of %<struct %E%>", name);
5010 else if (C_TYPE_BEING_DEFINED (ref))
5012 if (code == UNION_TYPE)
5013 error ("nested redefinition of %<union %E%>", name);
5015 error ("nested redefinition of %<struct %E%>", name);
5020 /* Otherwise create a forward-reference just so the tag is in scope. */
5022 ref = make_node (code);
5023 pushtag (name, ref);
5026 C_TYPE_BEING_DEFINED (ref) = 1;
5027 TYPE_PACKED (ref) = flag_pack_struct;
5031 /* Process the specs, declarator and width (NULL if omitted)
5032 of a structure component, returning a FIELD_DECL node.
5033 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5035 This is done during the parsing of the struct declaration.
5036 The FIELD_DECL nodes are chained together and the lot of them
5037 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5040 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5045 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5046 && width == NULL_TREE)
5048 /* This is an unnamed decl.
5050 If we have something of the form "union { list } ;" then this
5051 is the anonymous union extension. Similarly for struct.
5053 If this is something of the form "struct foo;", then
5054 If MS extensions are enabled, this is handled as an
5056 Otherwise this is a forward declaration of a structure tag.
5058 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5059 If MS extensions are enabled and foo names a structure, then
5060 again this is an anonymous struct.
5061 Otherwise this is an error.
5063 Oh what a horrid tangled web we weave. I wonder if MS consciously
5064 took this from Plan 9 or if it was an accident of implementation
5065 that took root before someone noticed the bug... */
5067 tree type = declspecs->type;
5068 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5069 || TREE_CODE (type) == UNION_TYPE);
5073 && (flag_ms_extensions || !declspecs->typedef_p))
5075 if (flag_ms_extensions)
5079 else if (TYPE_NAME (type) == NULL)
5086 pedwarn ("declaration does not declare anything");
5090 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5093 value = grokdeclarator (declarator, declspecs, FIELD, false,
5094 width ? &width : NULL);
5096 finish_decl (value, NULL_TREE, NULL_TREE);
5097 DECL_INITIAL (value) = width;
5102 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5103 the list such that this does not present a problem later. */
5106 detect_field_duplicates (tree fieldlist)
5111 /* First, see if there are more than "a few" fields.
5112 This is trivially true if there are zero or one fields. */
5115 x = TREE_CHAIN (fieldlist);
5121 } while (timeout > 0 && x);
5123 /* If there were "few" fields, avoid the overhead of allocating
5124 a hash table. Instead just do the nested traversal thing. */
5127 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5130 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5131 if (DECL_NAME (y) == DECL_NAME (x))
5133 error ("%Jduplicate member %qD", x, x);
5134 DECL_NAME (x) = NULL_TREE;
5140 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5143 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5144 if ((y = DECL_NAME (x)) != 0)
5146 slot = htab_find_slot (htab, y, INSERT);
5149 error ("%Jduplicate member %qD", x, x);
5150 DECL_NAME (x) = NULL_TREE;
5159 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5160 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5161 ATTRIBUTES are attributes to be applied to the structure. */
5164 finish_struct (tree t, tree fieldlist, tree attributes)
5167 bool toplevel = file_scope == current_scope;
5168 int saw_named_field;
5170 /* If this type was previously laid out as a forward reference,
5171 make sure we lay it out again. */
5175 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5179 for (x = fieldlist; x; x = TREE_CHAIN (x))
5180 if (DECL_NAME (x) != 0)
5185 if (TREE_CODE (t) == UNION_TYPE)
5188 pedwarn ("union has no named members");
5190 pedwarn ("union has no members");
5195 pedwarn ("struct has no named members");
5197 pedwarn ("struct has no members");
5202 /* Install struct as DECL_CONTEXT of each field decl.
5203 Also process specified field sizes, found in the DECL_INITIAL,
5204 storing 0 there after the type has been changed to precision equal
5205 to its width, rather than the precision of the specified standard
5206 type. (Correct layout requires the original type to have been preserved
5209 saw_named_field = 0;
5210 for (x = fieldlist; x; x = TREE_CHAIN (x))
5212 DECL_CONTEXT (x) = t;
5213 DECL_PACKED (x) |= TYPE_PACKED (t);
5215 /* If any field is const, the structure type is pseudo-const. */
5216 if (TREE_READONLY (x))
5217 C_TYPE_FIELDS_READONLY (t) = 1;
5220 /* A field that is pseudo-const makes the structure likewise. */
5221 tree t1 = TREE_TYPE (x);
5222 while (TREE_CODE (t1) == ARRAY_TYPE)
5223 t1 = TREE_TYPE (t1);
5224 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5225 && C_TYPE_FIELDS_READONLY (t1))
5226 C_TYPE_FIELDS_READONLY (t) = 1;
5229 /* Any field that is volatile means variables of this type must be
5230 treated in some ways as volatile. */
5231 if (TREE_THIS_VOLATILE (x))
5232 C_TYPE_FIELDS_VOLATILE (t) = 1;
5234 /* Any field of nominal variable size implies structure is too. */
5235 if (C_DECL_VARIABLE_SIZE (x))
5236 C_TYPE_VARIABLE_SIZE (t) = 1;
5238 if (DECL_INITIAL (x))
5240 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5241 DECL_SIZE (x) = bitsize_int (width);
5242 DECL_BIT_FIELD (x) = 1;
5243 SET_DECL_C_BIT_FIELD (x);
5246 /* Detect flexible array member in an invalid context. */
5247 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5248 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5249 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5250 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5252 if (TREE_CODE (t) == UNION_TYPE)
5254 error ("%Jflexible array member in union", x);
5255 TREE_TYPE (x) = error_mark_node;
5257 else if (TREE_CHAIN (x) != NULL_TREE)
5259 error ("%Jflexible array member not at end of struct", x);
5260 TREE_TYPE (x) = error_mark_node;
5262 else if (!saw_named_field)
5264 error ("%Jflexible array member in otherwise empty struct", x);
5265 TREE_TYPE (x) = error_mark_node;
5269 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5270 && flexible_array_type_p (TREE_TYPE (x)))
5271 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5274 saw_named_field = 1;
5277 detect_field_duplicates (fieldlist);
5279 /* Now we have the nearly final fieldlist. Record it,
5280 then lay out the structure or union (including the fields). */
5282 TYPE_FIELDS (t) = fieldlist;
5286 /* Give bit-fields their proper types. */
5288 tree *fieldlistp = &fieldlist;
5290 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5291 && TREE_TYPE (*fieldlistp) != error_mark_node)
5293 unsigned HOST_WIDE_INT width
5294 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5295 tree type = TREE_TYPE (*fieldlistp);
5296 if (width != TYPE_PRECISION (type))
5298 TREE_TYPE (*fieldlistp)
5299 = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
5300 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5302 DECL_INITIAL (*fieldlistp) = 0;
5305 fieldlistp = &TREE_CHAIN (*fieldlistp);
5308 /* Now we have the truly final field list.
5309 Store it in this type and in the variants. */
5311 TYPE_FIELDS (t) = fieldlist;
5313 /* If there are lots of fields, sort so we can look through them fast.
5314 We arbitrarily consider 16 or more elts to be "a lot". */
5319 for (x = fieldlist; x; x = TREE_CHAIN (x))
5321 if (len > 15 || DECL_NAME (x) == NULL)
5329 struct lang_type *space;
5330 struct sorted_fields_type *space2;
5332 len += list_length (x);
5334 /* Use the same allocation policy here that make_node uses, to
5335 ensure that this lives as long as the rest of the struct decl.
5336 All decls in an inline function need to be saved. */
5338 space = GGC_CNEW (struct lang_type);
5339 space2 = GGC_NEWVAR (struct sorted_fields_type,
5340 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5344 field_array = &space2->elts[0];
5345 for (x = fieldlist; x; x = TREE_CHAIN (x))
5347 field_array[len++] = x;
5349 /* If there is anonymous struct or union, break out of the loop. */
5350 if (DECL_NAME (x) == NULL)
5353 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5356 TYPE_LANG_SPECIFIC (t) = space;
5357 TYPE_LANG_SPECIFIC (t)->s->len = len;
5358 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5359 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5364 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5366 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5367 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5368 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5369 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5372 /* If this was supposed to be a transparent union, but we can't
5373 make it one, warn and turn off the flag. */
5374 if (TREE_CODE (t) == UNION_TYPE
5375 && TYPE_TRANSPARENT_UNION (t)
5376 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5378 TYPE_TRANSPARENT_UNION (t) = 0;
5379 warning ("union cannot be made transparent");
5382 /* If this structure or union completes the type of any previous
5383 variable declaration, lay it out and output its rtl. */
5384 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5388 tree decl = TREE_VALUE (x);
5389 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5390 layout_array_type (TREE_TYPE (decl));
5391 if (TREE_CODE (decl) != TYPE_DECL)
5393 layout_decl (decl, 0);
5394 if (c_dialect_objc ())
5395 objc_check_decl (decl);
5396 rest_of_decl_compilation (decl, toplevel, 0);
5401 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5403 /* Finish debugging output for this type. */
5404 rest_of_type_compilation (t, toplevel);
5406 /* If we're inside a function proper, i.e. not file-scope and not still
5407 parsing parameters, then arrange for the size of a variable sized type
5409 if (cur_stmt_list && variably_modified_type_p (t, NULL))
5410 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5415 /* Lay out the type T, and its element type, and so on. */
5418 layout_array_type (tree t)
5420 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5421 layout_array_type (TREE_TYPE (t));
5425 /* Begin compiling the definition of an enumeration type.
5426 NAME is its name (or null if anonymous).
5427 Returns the type object, as yet incomplete.
5428 Also records info about it so that build_enumerator
5429 may be used to declare the individual values as they are read. */
5432 start_enum (tree name)
5436 /* If this is the real definition for a previous forward reference,
5437 fill in the contents in the same object that used to be the
5438 forward reference. */
5441 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5443 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5445 enumtype = make_node (ENUMERAL_TYPE);
5446 pushtag (name, enumtype);
5449 if (C_TYPE_BEING_DEFINED (enumtype))
5450 error ("nested redefinition of %<enum %E%>", name);
5452 C_TYPE_BEING_DEFINED (enumtype) = 1;
5454 if (TYPE_VALUES (enumtype) != 0)
5456 /* This enum is a named one that has been declared already. */
5457 error ("redeclaration of %<enum %E%>", name);
5459 /* Completely replace its old definition.
5460 The old enumerators remain defined, however. */
5461 TYPE_VALUES (enumtype) = 0;
5464 enum_next_value = integer_zero_node;
5467 if (flag_short_enums)
5468 TYPE_PACKED (enumtype) = 1;
5473 /* After processing and defining all the values of an enumeration type,
5474 install their decls in the enumeration type and finish it off.
5475 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5476 and ATTRIBUTES are the specified attributes.
5477 Returns ENUMTYPE. */
5480 finish_enum (tree enumtype, tree values, tree attributes)
5483 tree minnode = 0, maxnode = 0;
5484 int precision, unsign;
5485 bool toplevel = (file_scope == current_scope);
5486 struct lang_type *lt;
5488 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5490 /* Calculate the maximum value of any enumerator in this type. */
5492 if (values == error_mark_node)
5493 minnode = maxnode = integer_zero_node;
5496 minnode = maxnode = TREE_VALUE (values);
5497 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5499 tree value = TREE_VALUE (pair);
5500 if (tree_int_cst_lt (maxnode, value))
5502 if (tree_int_cst_lt (value, minnode))
5507 /* Construct the final type of this enumeration. It is the same
5508 as one of the integral types - the narrowest one that fits, except
5509 that normally we only go as narrow as int - and signed iff any of
5510 the values are negative. */
5511 unsign = (tree_int_cst_sgn (minnode) >= 0);
5512 precision = MAX (min_precision (minnode, unsign),
5513 min_precision (maxnode, unsign));
5515 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5517 tem = c_common_type_for_size (precision, unsign);
5520 warning ("enumeration values exceed range of largest integer");
5521 tem = long_long_integer_type_node;
5525 tem = unsign ? unsigned_type_node : integer_type_node;
5527 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5528 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5529 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5530 TYPE_SIZE (enumtype) = 0;
5532 /* If the precision of the type was specific with an attribute and it
5533 was too small, give an error. Otherwise, use it. */
5534 if (TYPE_PRECISION (enumtype))
5536 if (precision > TYPE_PRECISION (enumtype))
5537 error ("specified mode too small for enumeral values");
5540 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5542 layout_type (enumtype);
5544 if (values != error_mark_node)
5546 /* Change the type of the enumerators to be the enum type. We
5547 need to do this irrespective of the size of the enum, for
5548 proper type checking. Replace the DECL_INITIALs of the
5549 enumerators, and the value slots of the list, with copies
5550 that have the enum type; they cannot be modified in place
5551 because they may be shared (e.g. integer_zero_node) Finally,
5552 change the purpose slots to point to the names of the decls. */
5553 for (pair = values; pair; pair = TREE_CHAIN (pair))
5555 tree enu = TREE_PURPOSE (pair);
5556 tree ini = DECL_INITIAL (enu);
5558 TREE_TYPE (enu) = enumtype;
5560 /* The ISO C Standard mandates enumerators to have type int,
5561 even though the underlying type of an enum type is
5562 unspecified. Here we convert any enumerators that fit in
5563 an int to type int, to avoid promotions to unsigned types
5564 when comparing integers with enumerators that fit in the
5565 int range. When -pedantic is given, build_enumerator()
5566 would have already taken care of those that don't fit. */
5567 if (int_fits_type_p (ini, integer_type_node))
5568 tem = integer_type_node;
5571 ini = convert (tem, ini);
5573 DECL_INITIAL (enu) = ini;
5574 TREE_PURPOSE (pair) = DECL_NAME (enu);
5575 TREE_VALUE (pair) = ini;
5578 TYPE_VALUES (enumtype) = values;
5581 /* Record the min/max values so that we can warn about bit-field
5582 enumerations that are too small for the values. */
5583 lt = GGC_CNEW (struct lang_type);
5584 lt->enum_min = minnode;
5585 lt->enum_max = maxnode;
5586 TYPE_LANG_SPECIFIC (enumtype) = lt;
5588 /* Fix up all variant types of this enum type. */
5589 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5591 if (tem == enumtype)
5593 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5594 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5595 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5596 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5597 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5598 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5599 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5600 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5601 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5602 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5603 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5606 /* Finish debugging output for this type. */
5607 rest_of_type_compilation (enumtype, toplevel);
5612 /* Build and install a CONST_DECL for one value of the
5613 current enumeration type (one that was begun with start_enum).
5614 Return a tree-list containing the CONST_DECL and its value.
5615 Assignment of sequential values by default is handled here. */
5618 build_enumerator (tree name, tree value)
5622 /* Validate and default VALUE. */
5626 /* Don't issue more errors for error_mark_node (i.e. an
5627 undeclared identifier) - just ignore the value expression. */
5628 if (value == error_mark_node)
5630 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5631 || TREE_CODE (value) != INTEGER_CST)
5633 error ("enumerator value for %qE is not an integer constant", name);
5638 value = default_conversion (value);
5639 constant_expression_warning (value);
5643 /* Default based on previous value. */
5644 /* It should no longer be possible to have NON_LVALUE_EXPR
5648 value = enum_next_value;
5650 error ("overflow in enumeration values");
5653 if (pedantic && !int_fits_type_p (value, integer_type_node))
5655 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5656 /* XXX This causes -pedantic to change the meaning of the program.
5657 Remove? -zw 2004-03-15 */
5658 value = convert (integer_type_node, value);
5661 /* Set basis for default for next value. */
5662 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5663 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5665 /* Now create a declaration for the enum value name. */
5667 type = TREE_TYPE (value);
5668 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5669 TYPE_PRECISION (integer_type_node)),
5670 (TYPE_PRECISION (type)
5671 >= TYPE_PRECISION (integer_type_node)
5672 && TYPE_UNSIGNED (type)));
5674 decl = build_decl (CONST_DECL, name, type);
5675 DECL_INITIAL (decl) = convert (type, value);
5678 return tree_cons (decl, value, NULL_TREE);
5682 /* Create the FUNCTION_DECL for a function definition.
5683 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5684 the declaration; they describe the function's name and the type it returns,
5685 but twisted together in a fashion that parallels the syntax of C.
5687 This function creates a binding context for the function body
5688 as well as setting up the FUNCTION_DECL in current_function_decl.
5690 Returns 1 on success. If the DECLARATOR is not suitable for a function
5691 (it defines a datum instead), we return 0, which tells
5692 yyparse to report a parse error. */
5695 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5698 tree decl1, old_decl;
5699 tree restype, resdecl;
5701 current_function_returns_value = 0; /* Assume, until we see it does. */
5702 current_function_returns_null = 0;
5703 current_function_returns_abnormally = 0;
5704 warn_about_return_type = 0;
5705 current_extern_inline = 0;
5706 c_switch_stack = NULL;
5708 /* Indicate no valid break/continue context by setting these variables
5709 to some non-null, non-label value. We'll notice and emit the proper
5710 error message in c_finish_bc_stmt. */
5711 c_break_label = c_cont_label = size_zero_node;
5713 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5715 /* If the declarator is not suitable for a function definition,
5716 cause a syntax error. */
5720 decl_attributes (&decl1, attributes, 0);
5722 if (DECL_DECLARED_INLINE_P (decl1)
5723 && DECL_UNINLINABLE (decl1)
5724 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5725 warning ("%Jinline function %qD given attribute noinline", decl1, decl1);
5727 announce_function (decl1);
5729 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5731 error ("return type is an incomplete type");
5732 /* Make it return void instead. */
5734 = build_function_type (void_type_node,
5735 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5738 if (warn_about_return_type)
5739 pedwarn_c99 ("return type defaults to %<int%>");
5741 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5742 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5743 DECL_INITIAL (decl1) = error_mark_node;
5745 /* If this definition isn't a prototype and we had a prototype declaration
5746 before, copy the arg type info from that prototype. */
5747 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5748 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5749 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5750 TREE_TYPE (TREE_TYPE (old_decl)))
5751 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5753 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5755 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5758 /* Optionally warn of old-fashioned def with no previous prototype. */
5759 if (warn_strict_prototypes
5760 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5761 && C_DECL_ISNT_PROTOTYPE (old_decl))
5762 warning ("function declaration isn%'t a prototype");
5763 /* Optionally warn of any global def with no previous prototype. */
5764 else if (warn_missing_prototypes
5765 && TREE_PUBLIC (decl1)
5766 && !MAIN_NAME_P (DECL_NAME (decl1))
5767 && C_DECL_ISNT_PROTOTYPE (old_decl))
5768 warning ("%Jno previous prototype for %qD", decl1, decl1);
5769 /* Optionally warn of any def with no previous prototype
5770 if the function has already been used. */
5771 else if (warn_missing_prototypes
5772 && old_decl != 0 && TREE_USED (old_decl)
5773 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5774 warning ("%J%qD was used with no prototype before its definition",
5776 /* Optionally warn of any global def with no previous declaration. */
5777 else if (warn_missing_declarations
5778 && TREE_PUBLIC (decl1)
5780 && !MAIN_NAME_P (DECL_NAME (decl1)))
5781 warning ("%Jno previous declaration for %qD", decl1, decl1);
5782 /* Optionally warn of any def with no previous declaration
5783 if the function has already been used. */
5784 else if (warn_missing_declarations
5785 && old_decl != 0 && TREE_USED (old_decl)
5786 && C_DECL_IMPLICIT (old_decl))
5787 warning ("%J%qD was used with no declaration before its definition",
5790 /* This is a definition, not a reference.
5791 So normally clear DECL_EXTERNAL.
5792 However, `extern inline' acts like a declaration
5793 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5794 DECL_EXTERNAL (decl1) = current_extern_inline;
5796 /* This function exists in static storage.
5797 (This does not mean `static' in the C sense!) */
5798 TREE_STATIC (decl1) = 1;
5800 /* A nested function is not global. */
5801 if (current_function_decl != 0)
5802 TREE_PUBLIC (decl1) = 0;
5804 /* This is the earliest point at which we might know the assembler
5805 name of the function. Thus, if it's set before this, die horribly. */
5806 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5808 /* If #pragma weak was used, mark the decl weak now. */
5809 if (current_scope == file_scope)
5810 maybe_apply_pragma_weak (decl1);
5812 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5813 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5818 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5819 != integer_type_node)
5820 pedwarn ("%Jreturn type of %qD is not %<int%>", decl1, decl1);
5822 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5823 args = TREE_CHAIN (args))
5825 tree type = args ? TREE_VALUE (args) : 0;
5827 if (type == void_type_node)
5834 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5835 pedwarn ("%Jfirst argument of %qD should be %<int%>",
5840 if (TREE_CODE (type) != POINTER_TYPE
5841 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5842 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5844 pedwarn ("%Jsecond argument of %qD should be %<char **%>",
5849 if (TREE_CODE (type) != POINTER_TYPE
5850 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5851 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5853 pedwarn ("%Jthird argument of %qD should probably be "
5854 "%<char **%>", decl1, decl1);
5859 /* It is intentional that this message does not mention the third
5860 argument because it's only mentioned in an appendix of the
5862 if (argct > 0 && (argct < 2 || argct > 3))
5863 pedwarn ("%J%qD takes only zero or two arguments", decl1, decl1);
5865 if (!TREE_PUBLIC (decl1))
5866 pedwarn ("%J%qD is normally a non-static function", decl1, decl1);
5869 /* Record the decl so that the function name is defined.
5870 If we already have a decl for this name, and it is a FUNCTION_DECL,
5871 use the old decl. */
5873 current_function_decl = pushdecl (decl1);
5876 declare_parm_level ();
5878 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5879 /* Promote the value to int before returning it. */
5880 if (c_promoting_integer_type_p (restype))
5882 /* It retains unsignedness if not really getting wider. */
5883 if (TYPE_UNSIGNED (restype)
5884 && (TYPE_PRECISION (restype)
5885 == TYPE_PRECISION (integer_type_node)))
5886 restype = unsigned_type_node;
5888 restype = integer_type_node;
5891 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
5892 DECL_ARTIFICIAL (resdecl) = 1;
5893 DECL_IGNORED_P (resdecl) = 1;
5894 DECL_RESULT (current_function_decl) = resdecl;
5896 start_fname_decls ();
5901 /* Subroutine of store_parm_decls which handles new-style function
5902 definitions (prototype format). The parms already have decls, so we
5903 need only record them as in effect and complain if any redundant
5904 old-style parm decls were written. */
5906 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
5910 if (current_scope->bindings)
5912 error ("%Jold-style parameter declarations in prototyped "
5913 "function definition", fndecl);
5915 /* Get rid of the old-style declarations. */
5919 /* Don't issue this warning for nested functions, and don't issue this
5920 warning if we got here because ARG_INFO_TYPES was error_mark_node
5921 (this happens when a function definition has just an ellipsis in
5922 its parameter list). */
5923 else if (warn_traditional && !in_system_header && !current_function_scope
5924 && arg_info->types != error_mark_node)
5925 warning ("%Jtraditional C rejects ISO C style function definitions",
5928 /* Now make all the parameter declarations visible in the function body.
5929 We can bypass most of the grunt work of pushdecl. */
5930 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
5932 DECL_CONTEXT (decl) = current_function_decl;
5933 if (DECL_NAME (decl))
5934 bind (DECL_NAME (decl), decl, current_scope,
5935 /*invisible=*/false, /*nested=*/false);
5937 error ("%Jparameter name omitted", decl);
5940 /* Record the parameter list in the function declaration. */
5941 DECL_ARGUMENTS (fndecl) = arg_info->parms;
5943 /* Now make all the ancillary declarations visible, likewise. */
5944 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
5946 DECL_CONTEXT (decl) = current_function_decl;
5947 if (DECL_NAME (decl))
5948 bind (DECL_NAME (decl), decl, current_scope,
5949 /*invisible=*/false, /*nested=*/false);
5952 /* And all the tag declarations. */
5953 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
5954 if (TREE_PURPOSE (decl))
5955 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
5956 /*invisible=*/false, /*nested=*/false);
5959 /* Subroutine of store_parm_decls which handles old-style function
5960 definitions (separate parameter list and declarations). */
5963 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
5965 struct c_binding *b;
5966 tree parm, decl, last;
5967 tree parmids = arg_info->parms;
5969 /* We use DECL_WEAK as a flag to show which parameters have been
5970 seen already, since it is not used on PARM_DECL. */
5971 #ifdef ENABLE_CHECKING
5972 for (b = current_scope->bindings; b; b = b->prev)
5973 gcc_assert (TREE_CODE (b->decl) != PARM_DECL || !DECL_WEAK (b->decl));
5976 if (warn_old_style_definition && !in_system_header)
5977 warning ("%Jold-style function definition", fndecl);
5979 /* Match each formal parameter name with its declaration. Save each
5980 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5981 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5983 if (TREE_VALUE (parm) == 0)
5985 error ("%Jparameter name missing from parameter list", fndecl);
5986 TREE_PURPOSE (parm) = 0;
5990 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
5991 if (b && B_IN_CURRENT_SCOPE (b))
5994 /* If we got something other than a PARM_DECL it is an error. */
5995 if (TREE_CODE (decl) != PARM_DECL)
5996 error ("%J%qD declared as a non-parameter", decl, decl);
5997 /* If the declaration is already marked, we have a duplicate
5998 name. Complain and ignore the duplicate. */
5999 else if (DECL_WEAK (decl))
6001 error ("%Jmultiple parameters named %qD", decl, decl);
6002 TREE_PURPOSE (parm) = 0;
6005 /* If the declaration says "void", complain and turn it into
6007 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6009 error ("%Jparameter %qD declared with void type", decl, decl);
6010 TREE_TYPE (decl) = integer_type_node;
6011 DECL_ARG_TYPE (decl) = integer_type_node;
6012 layout_decl (decl, 0);
6015 /* If no declaration found, default to int. */
6018 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6019 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6020 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6024 pedwarn ("%Jtype of %qD defaults to %<int%>", decl, decl);
6025 else if (extra_warnings)
6026 warning ("%Jtype of %qD defaults to %<int%>", decl, decl);
6029 TREE_PURPOSE (parm) = decl;
6030 DECL_WEAK (decl) = 1;
6033 /* Now examine the parms chain for incomplete declarations
6034 and declarations with no corresponding names. */
6036 for (b = current_scope->bindings; b; b = b->prev)
6039 if (TREE_CODE (parm) != PARM_DECL)
6042 if (TREE_TYPE (parm) != error_mark_node
6043 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6045 error ("%Jparameter %qD has incomplete type", parm, parm);
6046 TREE_TYPE (parm) = error_mark_node;
6049 if (!DECL_WEAK (parm))
6051 error ("%Jdeclaration for parameter %qD but no such parameter",
6054 /* Pretend the parameter was not missing.
6055 This gets us to a standard state and minimizes
6056 further error messages. */
6057 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6061 /* Chain the declarations together in the order of the list of
6062 names. Store that chain in the function decl, replacing the
6063 list of names. Update the current scope to match. */
6064 DECL_ARGUMENTS (fndecl) = 0;
6066 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6067 if (TREE_PURPOSE (parm))
6069 if (parm && TREE_PURPOSE (parm))
6071 last = TREE_PURPOSE (parm);
6072 DECL_ARGUMENTS (fndecl) = last;
6073 DECL_WEAK (last) = 0;
6075 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6076 if (TREE_PURPOSE (parm))
6078 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6079 last = TREE_PURPOSE (parm);
6080 DECL_WEAK (last) = 0;
6082 TREE_CHAIN (last) = 0;
6085 /* If there was a previous prototype,
6086 set the DECL_ARG_TYPE of each argument according to
6087 the type previously specified, and report any mismatches. */
6089 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6092 for (parm = DECL_ARGUMENTS (fndecl),
6093 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6094 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6095 != void_type_node));
6096 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6098 if (parm == 0 || type == 0
6099 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6101 error ("number of arguments doesn%'t match prototype");
6102 error ("%Hprototype declaration",
6103 ¤t_function_prototype_locus);
6106 /* Type for passing arg must be consistent with that
6107 declared for the arg. ISO C says we take the unqualified
6108 type for parameters declared with qualified type. */
6109 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6110 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6112 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6113 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6115 /* Adjust argument to match prototype. E.g. a previous
6116 `int foo(float);' prototype causes
6117 `int foo(x) float x; {...}' to be treated like
6118 `int foo(float x) {...}'. This is particularly
6119 useful for argument types like uid_t. */
6120 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6122 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6123 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6124 && TYPE_PRECISION (TREE_TYPE (parm))
6125 < TYPE_PRECISION (integer_type_node))
6126 DECL_ARG_TYPE (parm) = integer_type_node;
6130 pedwarn ("promoted argument %qD "
6131 "doesn%'t match prototype", parm);
6132 pedwarn ("%Hprototype declaration",
6133 ¤t_function_prototype_locus);
6138 error ("argument %qD doesn%'t match prototype", parm);
6139 error ("%Hprototype declaration",
6140 ¤t_function_prototype_locus);
6144 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6147 /* Otherwise, create a prototype that would match. */
6151 tree actual = 0, last = 0, type;
6153 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6155 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6157 TREE_CHAIN (last) = type;
6162 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6164 TREE_CHAIN (last) = type;
6168 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6169 of the type of this function, but we need to avoid having this
6170 affect the types of other similarly-typed functions, so we must
6171 first force the generation of an identical (but separate) type
6172 node for the relevant function type. The new node we create
6173 will be a variant of the main variant of the original function
6176 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6178 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6182 /* Store parameter declarations passed in ARG_INFO into the current
6183 function declaration. */
6186 store_parm_decls_from (struct c_arg_info *arg_info)
6188 current_function_arg_info = arg_info;
6189 store_parm_decls ();
6192 /* Store the parameter declarations into the current function declaration.
6193 This is called after parsing the parameter declarations, before
6194 digesting the body of the function.
6196 For an old-style definition, construct a prototype out of the old-style
6197 parameter declarations and inject it into the function's type. */
6200 store_parm_decls (void)
6202 tree fndecl = current_function_decl;
6205 /* The argument information block for FNDECL. */
6206 struct c_arg_info *arg_info = current_function_arg_info;
6207 current_function_arg_info = 0;
6209 /* True if this definition is written with a prototype. Note:
6210 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6211 list in a function definition as equivalent to (void) -- an
6212 empty argument list specifies the function has no parameters,
6213 but only (void) sets up a prototype for future calls. */
6214 proto = arg_info->types != 0;
6217 store_parm_decls_newstyle (fndecl, arg_info);
6219 store_parm_decls_oldstyle (fndecl, arg_info);
6221 /* The next call to push_scope will be a function body. */
6223 next_is_function_body = true;
6225 /* Write a record describing this function definition to the prototypes
6226 file (if requested). */
6228 gen_aux_info_record (fndecl, 1, 0, proto);
6230 /* Initialize the RTL code for the function. */
6231 allocate_struct_function (fndecl);
6233 /* Begin the statement tree for this function. */
6234 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6236 /* ??? Insert the contents of the pending sizes list into the function
6237 to be evaluated. The only reason left to have this is
6238 void foo(int n, int array[n++])
6239 because we throw away the array type in favor of a pointer type, and
6240 thus won't naturally see the SAVE_EXPR containing the increment. All
6241 other pending sizes would be handled by gimplify_parameters. */
6244 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6245 add_stmt (TREE_VALUE (t));
6248 /* Even though we're inside a function body, we still don't want to
6249 call expand_expr to calculate the size of a variable-sized array.
6250 We haven't necessarily assigned RTL to all variables yet, so it's
6251 not safe to try to expand expressions involving them. */
6252 cfun->x_dont_save_pending_sizes_p = 1;
6255 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6259 c_warn_unused_result_recursively (tree fndecl)
6261 struct cgraph_node *cgn;
6263 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6264 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6266 /* Finalize all nested functions now. */
6267 cgn = cgraph_node (fndecl);
6268 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6269 c_warn_unused_result_recursively (cgn->decl);
6272 /* Finish up a function declaration and compile that function
6273 all the way to assembler language output. The free the storage
6274 for the function definition.
6276 This is called after parsing the body of the function definition. */
6279 finish_function (void)
6281 tree fndecl = current_function_decl;
6283 if (TREE_CODE (fndecl) == FUNCTION_DECL
6284 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6286 tree args = DECL_ARGUMENTS (fndecl);
6287 for (; args; args = TREE_CHAIN (args))
6289 tree type = TREE_TYPE (args);
6290 if (INTEGRAL_TYPE_P (type)
6291 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6292 DECL_ARG_TYPE (args) = integer_type_node;
6296 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6297 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6299 /* Must mark the RESULT_DECL as being in this function. */
6301 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6302 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6304 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6306 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6307 != integer_type_node)
6309 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6310 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6312 pedwarn ("%Jreturn type of %qD is not %<int%>", fndecl, fndecl);
6318 tree stmt = c_finish_return (integer_zero_node);
6319 /* Hack. We don't want the middle-end to warn that this
6320 return is unreachable, so put the statement on the
6322 #ifdef USE_MAPPED_LOCATION
6323 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
6325 annotate_with_file_line (stmt, input_filename, 0);
6331 /* Tie off the statement tree for this function. */
6332 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6334 finish_fname_decls ();
6336 /* Complain if there's just no return statement. */
6337 if (warn_return_type
6338 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6339 && !current_function_returns_value && !current_function_returns_null
6340 /* Don't complain if we abort. */
6341 && !current_function_returns_abnormally
6342 /* Don't warn for main(). */
6343 && !MAIN_NAME_P (DECL_NAME (fndecl))
6344 /* Or if they didn't actually specify a return type. */
6345 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6346 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6347 inline function, as we might never be compiled separately. */
6348 && DECL_INLINE (fndecl))
6349 warning ("no return statement in function returning non-void");
6351 /* With just -Wextra, complain only if function returns both with
6352 and without a value. */
6354 && current_function_returns_value
6355 && current_function_returns_null)
6356 warning ("this function may return with or without a value");
6358 /* Store the end of the function, so that we get good line number
6359 info for the epilogue. */
6360 cfun->function_end_locus = input_location;
6362 /* If we don't have ctors/dtors sections, and this is a static
6363 constructor or destructor, it must be recorded now. */
6364 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6365 && !targetm.have_ctors_dtors)
6366 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6367 if (DECL_STATIC_DESTRUCTOR (fndecl)
6368 && !targetm.have_ctors_dtors)
6369 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6371 /* Finalize the ELF visibility for the function. */
6372 c_determine_visibility (fndecl);
6374 /* Genericize before inlining. Delay genericizing nested functions
6375 until their parent function is genericized. Since finalizing
6376 requires GENERIC, delay that as well. */
6378 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6379 && !undef_nested_function)
6381 if (!decl_function_context (fndecl))
6383 c_genericize (fndecl);
6384 c_warn_unused_result_recursively (fndecl);
6386 /* ??? Objc emits functions after finalizing the compilation unit.
6387 This should be cleaned up later and this conditional removed. */
6388 if (cgraph_global_info_ready)
6390 c_expand_body (fndecl);
6394 cgraph_finalize_function (fndecl, false);
6398 /* Register this function with cgraph just far enough to get it
6399 added to our parent's nested function list. Handy, since the
6400 C front end doesn't have such a list. */
6401 (void) cgraph_node (fndecl);
6405 if (!decl_function_context (fndecl))
6406 undef_nested_function = false;
6408 /* We're leaving the context of this function, so zap cfun.
6409 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6410 tree_rest_of_compilation. */
6412 current_function_decl = NULL;
6415 /* Generate the RTL for the body of FNDECL. */
6418 c_expand_body (tree fndecl)
6421 if (!DECL_INITIAL (fndecl)
6422 || DECL_INITIAL (fndecl) == error_mark_node)
6425 tree_rest_of_compilation (fndecl);
6427 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6428 && targetm.have_ctors_dtors)
6429 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6430 DEFAULT_INIT_PRIORITY);
6431 if (DECL_STATIC_DESTRUCTOR (fndecl)
6432 && targetm.have_ctors_dtors)
6433 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6434 DEFAULT_INIT_PRIORITY);
6437 /* Check the declarations given in a for-loop for satisfying the C99
6440 check_for_loop_decls (void)
6442 struct c_binding *b;
6446 /* If we get here, declarations have been used in a for loop without
6447 the C99 for loop scope. This doesn't make much sense, so don't
6449 error ("%<for%> loop initial declaration used outside C99 mode");
6452 /* C99 subclause 6.8.5 paragraph 3:
6454 [#3] The declaration part of a for statement shall only
6455 declare identifiers for objects having storage class auto or
6458 It isn't clear whether, in this sentence, "identifiers" binds to
6459 "shall only declare" or to "objects" - that is, whether all identifiers
6460 declared must be identifiers for objects, or whether the restriction
6461 only applies to those that are. (A question on this in comp.std.c
6462 in November 2000 received no answer.) We implement the strictest
6463 interpretation, to avoid creating an extension which later causes
6466 for (b = current_scope->bindings; b; b = b->prev)
6469 tree decl = b->decl;
6474 switch (TREE_CODE (decl))
6477 if (TREE_STATIC (decl))
6478 error ("%Jdeclaration of static variable %qD in %<for%> loop "
6479 "initial declaration", decl, decl);
6480 else if (DECL_EXTERNAL (decl))
6481 error ("%Jdeclaration of %<extern%> variable %qD in %<for%> loop "
6482 "initial declaration", decl, decl);
6486 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6490 error ("%<union %E%> declared in %<for%> loop initial declaration",
6494 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6498 error ("%Jdeclaration of non-variable %qD in %<for%> loop "
6499 "initial declaration", decl, decl);
6504 /* Save and reinitialize the variables
6505 used during compilation of a C function. */
6508 c_push_function_context (struct function *f)
6510 struct language_function *p;
6511 p = GGC_NEW (struct language_function);
6514 p->base.x_stmt_tree = c_stmt_tree;
6515 p->x_break_label = c_break_label;
6516 p->x_cont_label = c_cont_label;
6517 p->x_switch_stack = c_switch_stack;
6518 p->arg_info = current_function_arg_info;
6519 p->returns_value = current_function_returns_value;
6520 p->returns_null = current_function_returns_null;
6521 p->returns_abnormally = current_function_returns_abnormally;
6522 p->warn_about_return_type = warn_about_return_type;
6523 p->extern_inline = current_extern_inline;
6526 /* Restore the variables used during compilation of a C function. */
6529 c_pop_function_context (struct function *f)
6531 struct language_function *p = f->language;
6533 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6534 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6536 /* Stop pointing to the local nodes about to be freed. */
6537 /* But DECL_INITIAL must remain nonzero so we know this
6538 was an actual function definition. */
6539 DECL_INITIAL (current_function_decl) = error_mark_node;
6540 DECL_ARGUMENTS (current_function_decl) = 0;
6543 c_stmt_tree = p->base.x_stmt_tree;
6544 c_break_label = p->x_break_label;
6545 c_cont_label = p->x_cont_label;
6546 c_switch_stack = p->x_switch_stack;
6547 current_function_arg_info = p->arg_info;
6548 current_function_returns_value = p->returns_value;
6549 current_function_returns_null = p->returns_null;
6550 current_function_returns_abnormally = p->returns_abnormally;
6551 warn_about_return_type = p->warn_about_return_type;
6552 current_extern_inline = p->extern_inline;
6557 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6560 c_dup_lang_specific_decl (tree decl)
6562 struct lang_decl *ld;
6564 if (!DECL_LANG_SPECIFIC (decl))
6567 ld = GGC_NEW (struct lang_decl);
6568 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6569 DECL_LANG_SPECIFIC (decl) = ld;
6572 /* The functions below are required for functionality of doing
6573 function at once processing in the C front end. Currently these
6574 functions are not called from anywhere in the C front end, but as
6575 these changes continue, that will change. */
6577 /* Returns nonzero if the current statement is a full expression,
6578 i.e. temporaries created during that statement should be destroyed
6579 at the end of the statement. */
6582 stmts_are_full_exprs_p (void)
6587 /* Returns the stmt_tree (if any) to which statements are currently
6588 being added. If there is no active statement-tree, NULL is
6592 current_stmt_tree (void)
6594 return &c_stmt_tree;
6597 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6601 anon_aggr_type_p (tree ARG_UNUSED (node))
6606 /* Return the global value of T as a symbol. */
6609 identifier_global_value (tree t)
6611 struct c_binding *b;
6613 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6614 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6620 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6621 otherwise the name is found in ridpointers from RID_INDEX. */
6624 record_builtin_type (enum rid rid_index, const char *name, tree type)
6628 id = ridpointers[(int) rid_index];
6630 id = get_identifier (name);
6631 decl = build_decl (TYPE_DECL, id, type);
6633 if (debug_hooks->type_decl)
6634 debug_hooks->type_decl (decl, false);
6637 /* Build the void_list_node (void_type_node having been created). */
6639 build_void_list_node (void)
6641 tree t = build_tree_list (NULL_TREE, void_type_node);
6645 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6648 build_c_parm (struct c_declspecs *specs, tree attrs,
6649 struct c_declarator *declarator)
6651 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6654 ret->declarator = declarator;
6658 /* Return a declarator with nested attributes. TARGET is the inner
6659 declarator to which these attributes apply. ATTRS are the
6662 struct c_declarator *
6663 build_attrs_declarator (tree attrs, struct c_declarator *target)
6665 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6666 ret->kind = cdk_attrs;
6667 ret->declarator = target;
6668 ret->u.attrs = attrs;
6672 /* Return a declarator for a function with arguments specified by ARGS
6673 and return type specified by TARGET. */
6675 struct c_declarator *
6676 build_function_declarator (struct c_arg_info *args,
6677 struct c_declarator *target)
6679 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6680 ret->kind = cdk_function;
6681 ret->declarator = target;
6682 ret->u.arg_info = args;
6686 /* Return a declarator for the identifier IDENT (which may be
6687 NULL_TREE for an abstract declarator). */
6689 struct c_declarator *
6690 build_id_declarator (tree ident)
6692 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6694 ret->declarator = 0;
6696 /* Default value - may get reset to a more precise location. */
6697 ret->id_loc = input_location;
6701 /* Return something to represent absolute declarators containing a *.
6702 TARGET is the absolute declarator that the * contains.
6703 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6704 to apply to the pointer type. */
6706 struct c_declarator *
6707 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6708 struct c_declarator *target)
6712 struct c_declarator *itarget = target;
6713 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6714 if (type_quals_attrs)
6716 attrs = type_quals_attrs->attrs;
6717 quals = quals_from_declspecs (type_quals_attrs);
6718 if (attrs != NULL_TREE)
6719 itarget = build_attrs_declarator (attrs, target);
6721 ret->kind = cdk_pointer;
6722 ret->declarator = itarget;
6723 ret->u.pointer_quals = quals;
6727 /* Return a pointer to a structure for an empty list of declaration
6730 struct c_declspecs *
6731 build_null_declspecs (void)
6733 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6737 ret->typespec_word = cts_none;
6738 ret->storage_class = csc_none;
6739 ret->declspecs_seen_p = false;
6740 ret->type_seen_p = false;
6741 ret->non_sc_seen_p = false;
6742 ret->typedef_p = false;
6743 ret->tag_defined_p = false;
6744 ret->explicit_signed_p = false;
6745 ret->deprecated_p = false;
6746 ret->default_int_p = false;
6747 ret->long_p = false;
6748 ret->long_long_p = false;
6749 ret->short_p = false;
6750 ret->signed_p = false;
6751 ret->unsigned_p = false;
6752 ret->complex_p = false;
6753 ret->inline_p = false;
6754 ret->thread_p = false;
6755 ret->const_p = false;
6756 ret->volatile_p = false;
6757 ret->restrict_p = false;
6761 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6764 struct c_declspecs *
6765 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6769 specs->non_sc_seen_p = true;
6770 specs->declspecs_seen_p = true;
6771 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6772 && C_IS_RESERVED_WORD (qual));
6773 i = C_RID_CODE (qual);
6777 dupe = specs->const_p;
6778 specs->const_p = true;
6781 dupe = specs->volatile_p;
6782 specs->volatile_p = true;
6785 dupe = specs->restrict_p;
6786 specs->restrict_p = true;
6791 if (dupe && pedantic && !flag_isoc99)
6792 pedwarn ("duplicate %qE", qual);
6796 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6799 struct c_declspecs *
6800 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
6802 tree type = spec.spec;
6803 specs->non_sc_seen_p = true;
6804 specs->declspecs_seen_p = true;
6805 specs->type_seen_p = true;
6806 if (TREE_DEPRECATED (type))
6807 specs->deprecated_p = true;
6809 /* Handle type specifier keywords. */
6810 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
6812 enum rid i = C_RID_CODE (type);
6815 error ("two or more data types in declaration specifiers");
6818 if ((int) i <= (int) RID_LAST_MODIFIER)
6820 /* "long", "short", "signed", "unsigned" or "_Complex". */
6825 if (specs->long_long_p)
6827 error ("%<long long long%> is too long for GCC");
6832 if (specs->typespec_word == cts_double)
6834 error ("both %<long long%> and %<double%> in "
6835 "declaration specifiers");
6838 if (pedantic && !flag_isoc99 && !in_system_header
6840 pedwarn ("ISO C90 does not support %<long long%>");
6841 specs->long_long_p = 1;
6845 error ("both %<long%> and %<short%> in "
6846 "declaration specifiers");
6847 else if (specs->typespec_word == cts_void)
6848 error ("both %<long%> and %<void%> in "
6849 "declaration specifiers");
6850 else if (specs->typespec_word == cts_bool)
6851 error ("both %<long%> and %<_Bool%> in "
6852 "declaration specifiers");
6853 else if (specs->typespec_word == cts_char)
6854 error ("both %<long%> and %<char%> in "
6855 "declaration specifiers");
6856 else if (specs->typespec_word == cts_float)
6857 error ("both %<long%> and %<float%> in "
6858 "declaration specifiers");
6860 specs->long_p = true;
6863 dupe = specs->short_p;
6865 error ("both %<long%> and %<short%> in "
6866 "declaration specifiers");
6867 else if (specs->typespec_word == cts_void)
6868 error ("both %<short%> and %<void%> in "
6869 "declaration specifiers");
6870 else if (specs->typespec_word == cts_bool)
6871 error ("both %<short%> and %<_Bool%> in "
6872 "declaration specifiers");
6873 else if (specs->typespec_word == cts_char)
6874 error ("both %<short%> and %<char%> in "
6875 "declaration specifiers");
6876 else if (specs->typespec_word == cts_float)
6877 error ("both %<short%> and %<float%> in "
6878 "declaration specifiers");
6879 else if (specs->typespec_word == cts_double)
6880 error ("both %<short%> and %<double%> in "
6881 "declaration specifiers");
6883 specs->short_p = true;
6886 dupe = specs->signed_p;
6887 if (specs->unsigned_p)
6888 error ("both %<signed%> and %<unsigned%> in "
6889 "declaration specifiers");
6890 else if (specs->typespec_word == cts_void)
6891 error ("both %<signed%> and %<void%> in "
6892 "declaration specifiers");
6893 else if (specs->typespec_word == cts_bool)
6894 error ("both %<signed%> and %<_Bool%> in "
6895 "declaration specifiers");
6896 else if (specs->typespec_word == cts_float)
6897 error ("both %<signed%> and %<float%> in "
6898 "declaration specifiers");
6899 else if (specs->typespec_word == cts_double)
6900 error ("both %<signed%> and %<double%> in "
6901 "declaration specifiers");
6903 specs->signed_p = true;
6906 dupe = specs->unsigned_p;
6907 if (specs->signed_p)
6908 error ("both %<signed%> and %<unsigned%> in "
6909 "declaration specifiers");
6910 else if (specs->typespec_word == cts_void)
6911 error ("both %<unsigned%> and %<void%> in "
6912 "declaration specifiers");
6913 else if (specs->typespec_word == cts_bool)
6914 error ("both %<unsigned%> and %<_Bool%> in "
6915 "declaration specifiers");
6916 else if (specs->typespec_word == cts_float)
6917 error ("both %<unsigned%> and %<float%> in "
6918 "declaration specifiers");
6919 else if (specs->typespec_word == cts_double)
6920 error ("both %<unsigned%> and %<double%> in "
6921 "declaration specifiers");
6923 specs->unsigned_p = true;
6926 dupe = specs->complex_p;
6927 if (pedantic && !flag_isoc99 && !in_system_header)
6928 pedwarn ("ISO C90 does not support complex types");
6929 if (specs->typespec_word == cts_void)
6930 error ("both %<complex%> and %<void%> in "
6931 "declaration specifiers");
6932 else if (specs->typespec_word == cts_bool)
6933 error ("both %<complex%> and %<_Bool%> in "
6934 "declaration specifiers");
6936 specs->complex_p = true;
6943 error ("duplicate %qE", type);
6949 /* "void", "_Bool", "char", "int", "float" or "double". */
6950 if (specs->typespec_word != cts_none)
6952 error ("two or more data types in declaration specifiers");
6959 error ("both %<long%> and %<void%> in "
6960 "declaration specifiers");
6961 else if (specs->short_p)
6962 error ("both %<short%> and %<void%> in "
6963 "declaration specifiers");
6964 else if (specs->signed_p)
6965 error ("both %<signed%> and %<void%> in "
6966 "declaration specifiers");
6967 else if (specs->unsigned_p)
6968 error ("both %<unsigned%> and %<void%> in "
6969 "declaration specifiers");
6970 else if (specs->complex_p)
6971 error ("both %<complex%> and %<void%> in "
6972 "declaration specifiers");
6974 specs->typespec_word = cts_void;
6978 error ("both %<long%> and %<_Bool%> in "
6979 "declaration specifiers");
6980 else if (specs->short_p)
6981 error ("both %<short%> and %<_Bool%> in "
6982 "declaration specifiers");
6983 else if (specs->signed_p)
6984 error ("both %<signed%> and %<_Bool%> in "
6985 "declaration specifiers");
6986 else if (specs->unsigned_p)
6987 error ("both %<unsigned%> and %<_Bool%> in "
6988 "declaration specifiers");
6989 else if (specs->complex_p)
6990 error ("both %<complex%> and %<_Bool%> in "
6991 "declaration specifiers");
6993 specs->typespec_word = cts_bool;
6997 error ("both %<long%> and %<char%> in "
6998 "declaration specifiers");
6999 else if (specs->short_p)
7000 error ("both %<short%> and %<char%> in "
7001 "declaration specifiers");
7003 specs->typespec_word = cts_char;
7006 specs->typespec_word = cts_int;
7010 error ("both %<long%> and %<float%> in "
7011 "declaration specifiers");
7012 else if (specs->short_p)
7013 error ("both %<short%> and %<float%> in "
7014 "declaration specifiers");
7015 else if (specs->signed_p)
7016 error ("both %<signed%> and %<float%> in "
7017 "declaration specifiers");
7018 else if (specs->unsigned_p)
7019 error ("both %<unsigned%> and %<float%> in "
7020 "declaration specifiers");
7022 specs->typespec_word = cts_float;
7025 if (specs->long_long_p)
7026 error ("both %<long long%> and %<double%> in "
7027 "declaration specifiers");
7028 else if (specs->short_p)
7029 error ("both %<short%> and %<double%> in "
7030 "declaration specifiers");
7031 else if (specs->signed_p)
7032 error ("both %<signed%> and %<double%> in "
7033 "declaration specifiers");
7034 else if (specs->unsigned_p)
7035 error ("both %<unsigned%> and %<double%> in "
7036 "declaration specifiers");
7038 specs->typespec_word = cts_double;
7041 /* ObjC reserved word "id", handled below. */
7047 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7048 form of ObjC type, cases such as "int" and "long" being handled
7049 above), a TYPE (struct, union, enum and typeof specifiers) or an
7050 ERROR_MARK. In none of these cases may there have previously
7051 been any type specifiers. */
7052 if (specs->type || specs->typespec_word != cts_none
7053 || specs->long_p || specs->short_p || specs->signed_p
7054 || specs->unsigned_p || specs->complex_p)
7055 error ("two or more data types in declaration specifiers");
7056 else if (TREE_CODE (type) == TYPE_DECL)
7058 if (TREE_TYPE (type) == error_mark_node)
7059 ; /* Allow the type to default to int to avoid cascading errors. */
7062 specs->type = TREE_TYPE (type);
7063 specs->decl_attr = DECL_ATTRIBUTES (type);
7064 specs->typedef_p = true;
7065 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7068 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7070 tree t = lookup_name (type);
7071 if (!t || TREE_CODE (t) != TYPE_DECL)
7072 error ("%qE fails to be a typedef or built in type", type);
7073 else if (TREE_TYPE (t) == error_mark_node)
7076 specs->type = TREE_TYPE (t);
7078 else if (TREE_CODE (type) != ERROR_MARK)
7080 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7081 specs->tag_defined_p = true;
7082 if (spec.kind == ctsk_typeof)
7083 specs->typedef_p = true;
7090 /* Add the storage class specifier or function specifier SCSPEC to the
7091 declaration specifiers SPECS, returning SPECS. */
7093 struct c_declspecs *
7094 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7097 enum c_storage_class n = csc_none;
7099 specs->declspecs_seen_p = true;
7100 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7101 && C_IS_RESERVED_WORD (scspec));
7102 i = C_RID_CODE (scspec);
7103 if (extra_warnings && specs->non_sc_seen_p)
7104 warning ("%qE is not at beginning of declaration", scspec);
7108 /* C99 permits duplicate inline. Although of doubtful utility,
7109 it seems simplest to permit it in gnu89 mode as well, as
7110 there is also little utility in maintaining this as a
7111 difference between gnu89 and C99 inline. */
7113 specs->inline_p = true;
7116 dupe = specs->thread_p;
7117 if (specs->storage_class == csc_auto)
7118 error ("%<__thread%> used with %<auto%>");
7119 else if (specs->storage_class == csc_register)
7120 error ("%<__thread%> used with %<register%>");
7121 else if (specs->storage_class == csc_typedef)
7122 error ("%<__thread%> used with %<typedef%>");
7124 specs->thread_p = true;
7131 /* Diagnose "__thread extern". */
7132 if (specs->thread_p)
7133 error ("%<__thread%> before %<extern%>");
7140 /* Diagnose "__thread static". */
7141 if (specs->thread_p)
7142 error ("%<__thread%> before %<static%>");
7150 if (n != csc_none && n == specs->storage_class)
7153 error ("duplicate %qE", scspec);
7156 if (specs->storage_class != csc_none && n != specs->storage_class)
7158 error ("multiple storage classes in declaration specifiers");
7162 specs->storage_class = n;
7163 if (n != csc_extern && n != csc_static && specs->thread_p)
7165 error ("%<__thread%> used with %qE", scspec);
7166 specs->thread_p = false;
7173 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7176 struct c_declspecs *
7177 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7179 specs->attrs = chainon (attrs, specs->attrs);
7180 specs->declspecs_seen_p = true;
7184 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7185 specifiers with any other type specifier to determine the resulting
7186 type. This is where ISO C checks on complex types are made, since
7187 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7190 struct c_declspecs *
7191 finish_declspecs (struct c_declspecs *specs)
7193 /* If a type was specified as a whole, we have no modifiers and are
7195 if (specs->type != NULL_TREE)
7197 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7198 && !specs->signed_p && !specs->unsigned_p
7199 && !specs->complex_p);
7203 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7204 has been specified, treat it as "int" unless "_Complex" is
7205 present and there are no other specifiers. If we just have
7206 "_Complex", it is equivalent to "_Complex double", but e.g.
7207 "_Complex short" is equivalent to "_Complex short int". */
7208 if (specs->typespec_word == cts_none)
7210 if (specs->long_p || specs->short_p
7211 || specs->signed_p || specs->unsigned_p)
7213 specs->typespec_word = cts_int;
7215 else if (specs->complex_p)
7217 specs->typespec_word = cts_double;
7219 pedwarn ("ISO C does not support plain %<complex%> meaning "
7220 "%<double complex%>");
7224 specs->typespec_word = cts_int;
7225 specs->default_int_p = true;
7226 /* We don't diagnose this here because grokdeclarator will
7227 give more specific diagnostics according to whether it is
7228 a function definition. */
7232 /* If "signed" was specified, record this to distinguish "int" and
7233 "signed int" in the case of a bit-field with
7234 -funsigned-bitfields. */
7235 specs->explicit_signed_p = specs->signed_p;
7237 /* Now compute the actual type. */
7238 switch (specs->typespec_word)
7241 gcc_assert (!specs->long_p && !specs->short_p
7242 && !specs->signed_p && !specs->unsigned_p
7243 && !specs->complex_p);
7244 specs->type = void_type_node;
7247 gcc_assert (!specs->long_p && !specs->short_p
7248 && !specs->signed_p && !specs->unsigned_p
7249 && !specs->complex_p);
7250 specs->type = boolean_type_node;
7253 gcc_assert (!specs->long_p && !specs->short_p);
7254 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7255 if (specs->signed_p)
7256 specs->type = signed_char_type_node;
7257 else if (specs->unsigned_p)
7258 specs->type = unsigned_char_type_node;
7260 specs->type = char_type_node;
7261 if (specs->complex_p)
7264 pedwarn ("ISO C does not support complex integer types");
7265 specs->type = build_complex_type (specs->type);
7269 gcc_assert (!(specs->long_p && specs->short_p));
7270 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7271 if (specs->long_long_p)
7272 specs->type = (specs->unsigned_p
7273 ? long_long_unsigned_type_node
7274 : long_long_integer_type_node);
7275 else if (specs->long_p)
7276 specs->type = (specs->unsigned_p
7277 ? long_unsigned_type_node
7278 : long_integer_type_node);
7279 else if (specs->short_p)
7280 specs->type = (specs->unsigned_p
7281 ? short_unsigned_type_node
7282 : short_integer_type_node);
7284 specs->type = (specs->unsigned_p
7285 ? unsigned_type_node
7286 : integer_type_node);
7287 if (specs->complex_p)
7290 pedwarn ("ISO C does not support complex integer types");
7291 specs->type = build_complex_type (specs->type);
7295 gcc_assert (!specs->long_p && !specs->short_p
7296 && !specs->signed_p && !specs->unsigned_p);
7297 specs->type = (specs->complex_p
7298 ? complex_float_type_node
7302 gcc_assert (!specs->long_long_p && !specs->short_p
7303 && !specs->signed_p && !specs->unsigned_p);
7306 specs->type = (specs->complex_p
7307 ? complex_long_double_type_node
7308 : long_double_type_node);
7312 specs->type = (specs->complex_p
7313 ? complex_double_type_node
7314 : double_type_node);
7324 /* Synthesize a function which calls all the global ctors or global
7325 dtors in this file. This is only used for targets which do not
7326 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7328 build_cdtor (int method_type, tree cdtors)
7335 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7336 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7339 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7342 /* Perform final processing on one file scope's declarations (or the
7343 external scope's declarations), GLOBALS. */
7345 c_write_global_declarations_1 (tree globals)
7347 size_t len = list_length (globals);
7348 tree *vec = XNEWVEC (tree, len);
7352 /* Process the decls in the order they were written. */
7353 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
7356 /* Check for used but undefined static functions using the C
7357 standard's definition of "used", and set TREE_NO_WARNING so
7358 that check_global_declarations doesn't repeat the check. */
7359 if (TREE_CODE (decl) == FUNCTION_DECL
7360 && DECL_INITIAL (decl) == 0
7361 && DECL_EXTERNAL (decl)
7362 && !TREE_PUBLIC (decl)
7363 && C_DECL_USED (decl))
7365 pedwarn ("%J%qF used but never defined", decl, decl);
7366 TREE_NO_WARNING (decl) = 1;
7370 wrapup_global_declarations (vec, len);
7371 check_global_declarations (vec, len);
7377 c_write_global_declarations (void)
7381 /* We don't want to do this if generating a PCH. */
7385 /* Don't waste time on further processing if -fsyntax-only or we've
7386 encountered errors. */
7387 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7390 /* Close the external scope. */
7391 ext_block = pop_scope ();
7393 gcc_assert (!current_scope);
7395 /* Process all file scopes in this compilation, and the external_scope,
7396 through wrapup_global_declarations and check_global_declarations. */
7397 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7398 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7399 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7401 /* Generate functions to call static constructors and destructors
7402 for targets that do not support .ctors/.dtors sections. These
7403 functions have magic names which are detected by collect2. */
7404 build_cdtor ('I', static_ctors); static_ctors = 0;
7405 build_cdtor ('D', static_dtors); static_dtors = 0;
7407 /* We're done parsing; proceed to optimize and emit assembly.
7408 FIXME: shouldn't be the front end's responsibility to call this. */
7412 #include "gt-c-decl.h"