1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, 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 COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
21 /* Process declarations and symbol lookup for C front end.
22 Also constructs types; the standard scalar types at initialization,
23 and structure, union, array and enum types when they are declared. */
25 /* ??? not all decl nodes are given the most useful possible
26 line numbers. For example, the CONST_DECLs for enum values. */
30 #include "coretypes.h"
35 #include "tree-inline.h"
52 #include "langhooks.h"
53 #include "tree-mudflap.h"
54 #include "tree-gimple.h"
55 #include "diagnostic.h"
56 #include "tree-dump.h"
61 #include "langhooks-def.h"
62 #include "pointer-set.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) */
72 /* States indicating how grokdeclarator() should handle declspecs marked
73 with __attribute__((deprecated)). An object declared as
74 __attribute__((deprecated)) suppresses warnings of uses of other
77 enum deprecated_states {
83 /* Nonzero if we have seen an invalid cross reference
84 to a struct, union, or enum, but not yet printed the message. */
85 tree pending_invalid_xref;
87 /* File and line to appear in the eventual error message. */
88 location_t pending_invalid_xref_location;
90 /* True means we've initialized exception handling. */
91 bool c_eh_initialized_p;
93 /* The file and line that the prototype came from if this is an
94 old-style definition; used for diagnostics in
95 store_parm_decls_oldstyle. */
97 static location_t current_function_prototype_locus;
99 /* Whether this prototype was built-in. */
101 static bool current_function_prototype_built_in;
103 /* The argument type information of this prototype. */
105 static tree current_function_prototype_arg_types;
107 /* The argument information structure for the function currently being
110 static struct c_arg_info *current_function_arg_info;
112 /* The obstack on which parser and related data structures, which are
113 not live beyond their top-level declaration or definition, are
115 struct obstack parser_obstack;
117 /* The current statement tree. */
119 static GTY(()) struct stmt_tree_s c_stmt_tree;
121 /* State saving variables. */
125 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
126 included in this invocation. Note that the current translation
127 unit is not included in this list. */
129 static GTY(()) tree all_translation_units;
131 /* A list of decls to be made automatically visible in each file scope. */
132 static GTY(()) tree visible_builtins;
134 /* Set to 0 at beginning of a function definition, set to 1 if
135 a return statement that specifies a return value is seen. */
137 int current_function_returns_value;
139 /* Set to 0 at beginning of a function definition, set to 1 if
140 a return statement with no argument is seen. */
142 int current_function_returns_null;
144 /* Set to 0 at beginning of a function definition, set to 1 if
145 a call to a noreturn function is seen. */
147 int current_function_returns_abnormally;
149 /* Set to nonzero by `grokdeclarator' for a function
150 whose return type is defaulted, if warnings for this are desired. */
152 static int warn_about_return_type;
154 /* Nonzero when the current toplevel function contains a declaration
155 of a nested function which is never defined. */
157 static bool undef_nested_function;
159 /* True means global_bindings_p should return false even if the scope stack
160 says we are in file scope. */
161 bool c_override_global_bindings_to_false;
164 /* Each c_binding structure describes one binding of an identifier to
165 a decl. All the decls in a scope - irrespective of namespace - are
166 chained together by the ->prev field, which (as the name implies)
167 runs in reverse order. All the decls in a given namespace bound to
168 a given identifier are chained by the ->shadowed field, which runs
169 from inner to outer scopes.
171 The ->decl field usually points to a DECL node, but there are two
172 exceptions. In the namespace of type tags, the bound entity is a
173 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
174 identifier is encountered, it is bound to error_mark_node to
175 suppress further errors about that identifier in the current
178 The ->type field stores the type of the declaration in this scope;
179 if NULL, the type is the type of the ->decl field. This is only of
180 relevance for objects with external or internal linkage which may
181 be redeclared in inner scopes, forming composite types that only
182 persist for the duration of those scopes. In the external scope,
183 this stores the composite of all the types declared for this
184 object, visible or not. The ->inner_comp field (used only at file
185 scope) stores whether an incomplete array type at file scope was
186 completed at an inner scope to an array size other than 1.
188 The depth field is copied from the scope structure that holds this
189 decl. It is used to preserve the proper ordering of the ->shadowed
190 field (see bind()) and also for a handful of special-case checks.
191 Finally, the invisible bit is true for a decl which should be
192 ignored for purposes of normal name lookup, and the nested bit is
193 true for a decl that's been bound a second time in an inner scope;
194 in all such cases, the binding in the outer scope will have its
195 invisible bit true. */
197 struct c_binding GTY((chain_next ("%h.prev")))
199 tree decl; /* the decl bound */
200 tree type; /* the type in this scope */
201 tree id; /* the identifier it's bound to */
202 struct c_binding *prev; /* the previous decl in this scope */
203 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
204 unsigned int depth : 28; /* depth of this scope */
205 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
206 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
207 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
210 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
211 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
212 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
213 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
215 #define I_SYMBOL_BINDING(node) \
216 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
217 #define I_SYMBOL_DECL(node) \
218 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
220 #define I_TAG_BINDING(node) \
221 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
222 #define I_TAG_DECL(node) \
223 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
225 #define I_LABEL_BINDING(node) \
226 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
227 #define I_LABEL_DECL(node) \
228 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
230 /* Each C symbol points to three linked lists of c_binding structures.
231 These describe the values of the identifier in the three different
232 namespaces defined by the language. */
234 struct lang_identifier GTY(())
236 struct c_common_identifier common_id;
237 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
238 struct c_binding *tag_binding; /* struct/union/enum tags */
239 struct c_binding *label_binding; /* labels */
242 /* Validate c-lang.c's assumptions. */
243 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
244 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
246 /* The resulting tree type. */
249 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
250 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) GENERIC_NEXT (&%h.generic))")))
252 union tree_node GTY ((tag ("0"),
253 desc ("tree_node_structure (&%h)")))
255 struct lang_identifier GTY ((tag ("1"))) identifier;
258 /* Each c_scope structure describes the complete contents of one
259 scope. Four scopes are distinguished specially: the innermost or
260 current scope, the innermost function scope, the file scope (always
261 the second to outermost) and the outermost or external scope.
263 Most declarations are recorded in the current scope.
265 All normal label declarations are recorded in the innermost
266 function scope, as are bindings of undeclared identifiers to
267 error_mark_node. (GCC permits nested functions as an extension,
268 hence the 'innermost' qualifier.) Explicitly declared labels
269 (using the __label__ extension) appear in the current scope.
271 Being in the file scope (current_scope == file_scope) causes
272 special behavior in several places below. Also, under some
273 conditions the Objective-C front end records declarations in the
274 file scope even though that isn't the current scope.
276 All declarations with external linkage are recorded in the external
277 scope, even if they aren't visible there; this models the fact that
278 such declarations are visible to the entire program, and (with a
279 bit of cleverness, see pushdecl) allows diagnosis of some violations
280 of C99 6.2.2p7 and 6.2.7p2:
282 If, within the same translation unit, the same identifier appears
283 with both internal and external linkage, the behavior is
286 All declarations that refer to the same object or function shall
287 have compatible type; otherwise, the behavior is undefined.
289 Initially only the built-in declarations, which describe compiler
290 intrinsic functions plus a subset of the standard library, are in
293 The order of the blocks list matters, and it is frequently appended
294 to. To avoid having to walk all the way to the end of the list on
295 each insertion, or reverse the list later, we maintain a pointer to
296 the last list entry. (FIXME: It should be feasible to use a reversed
299 The bindings list is strictly in reverse order of declarations;
300 pop_scope relies on this. */
303 struct c_scope GTY((chain_next ("%h.outer")))
305 /* The scope containing this one. */
306 struct c_scope *outer;
308 /* The next outermost function scope. */
309 struct c_scope *outer_function;
311 /* All bindings in this scope. */
312 struct c_binding *bindings;
314 /* For each scope (except the global one), a chain of BLOCK nodes
315 for all the scopes that were entered and exited one level down. */
319 /* The depth of this scope. Used to keep the ->shadowed chain of
320 bindings sorted innermost to outermost. */
321 unsigned int depth : 28;
323 /* True if we are currently filling this scope with parameter
325 BOOL_BITFIELD parm_flag : 1;
327 /* True if we saw [*] in this scope. Used to give an error messages
328 if these appears in a function definition. */
329 BOOL_BITFIELD had_vla_unspec : 1;
331 /* True if we already complained about forward parameter decls
332 in this scope. This prevents double warnings on
333 foo (int a; int b; ...) */
334 BOOL_BITFIELD warned_forward_parm_decls : 1;
336 /* True if this is the outermost block scope of a function body.
337 This scope contains the parameters, the local variables declared
338 in the outermost block, and all the labels (except those in
339 nested functions, or declared at block scope with __label__). */
340 BOOL_BITFIELD function_body : 1;
342 /* True means make a BLOCK for this scope no matter what. */
343 BOOL_BITFIELD keep : 1;
346 /* The scope currently in effect. */
348 static GTY(()) struct c_scope *current_scope;
350 /* The innermost function scope. Ordinary (not explicitly declared)
351 labels, bindings to error_mark_node, and the lazily-created
352 bindings of __func__ and its friends get this scope. */
354 static GTY(()) struct c_scope *current_function_scope;
356 /* The C file scope. This is reset for each input translation unit. */
358 static GTY(()) struct c_scope *file_scope;
360 /* The outermost scope. This is used for all declarations with
361 external linkage, and only these, hence the name. */
363 static GTY(()) struct c_scope *external_scope;
365 /* A chain of c_scope structures awaiting reuse. */
367 static GTY((deletable)) struct c_scope *scope_freelist;
369 /* A chain of c_binding structures awaiting reuse. */
371 static GTY((deletable)) struct c_binding *binding_freelist;
373 /* Append VAR to LIST in scope SCOPE. */
374 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
375 struct c_scope *s_ = (scope); \
377 if (s_->list##_last) \
378 TREE_CHAIN (s_->list##_last) = d_; \
381 s_->list##_last = d_; \
384 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
385 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
386 struct c_scope *t_ = (tscope); \
387 struct c_scope *f_ = (fscope); \
389 TREE_CHAIN (t_->to##_last) = f_->from; \
392 t_->to##_last = f_->from##_last; \
395 /* True means unconditionally make a BLOCK for the next scope pushed. */
397 static bool keep_next_level_flag;
399 /* True means the next call to push_scope will be the outermost scope
400 of a function body, so do not push a new scope, merely cease
401 expecting parameter decls. */
403 static bool next_is_function_body;
405 /* Forward declarations. */
406 static tree lookup_name_in_scope (tree, struct c_scope *);
407 static tree c_make_fname_decl (tree, int);
408 static tree grokdeclarator (const struct c_declarator *,
409 struct c_declspecs *,
410 enum decl_context, bool, tree *,
411 enum deprecated_states);
412 static tree grokparms (struct c_arg_info *, bool);
413 static void layout_array_type (tree);
415 /* T is a statement. Add it to the statement-tree. This is the
416 C/ObjC version--C++ has a slightly different version of this
422 enum tree_code code = TREE_CODE (t);
424 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
426 if (!EXPR_HAS_LOCATION (t))
427 SET_EXPR_LOCATION (t, input_location);
430 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
431 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
433 /* Add T to the statement-tree. Non-side-effect statements need to be
434 recorded during statement expressions. */
435 append_to_statement_list_force (t, &cur_stmt_list);
442 c_print_identifier (FILE *file, tree node, int indent)
444 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
445 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
446 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
447 if (C_IS_RESERVED_WORD (node))
449 tree rid = ridpointers[C_RID_CODE (node)];
450 indent_to (file, indent + 4);
451 fprintf (file, "rid %p \"%s\"",
452 (void *) rid, IDENTIFIER_POINTER (rid));
456 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
457 which may be any of several kinds of DECL or TYPE or error_mark_node,
458 in the scope SCOPE. */
460 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
462 struct c_binding *b, **here;
464 if (binding_freelist)
466 b = binding_freelist;
467 binding_freelist = b->prev;
470 b = GGC_NEW (struct c_binding);
475 b->depth = scope->depth;
476 b->invisible = invisible;
482 b->prev = scope->bindings;
488 switch (TREE_CODE (decl))
490 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
493 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
499 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
505 /* Locate the appropriate place in the chain of shadowed decls
506 to insert this binding. Normally, scope == current_scope and
507 this does nothing. */
508 while (*here && (*here)->depth > scope->depth)
509 here = &(*here)->shadowed;
515 /* Clear the binding structure B, stick it on the binding_freelist,
516 and return the former value of b->prev. This is used by pop_scope
517 and get_parm_info to iterate destructively over all the bindings
518 from a given scope. */
519 static struct c_binding *
520 free_binding_and_advance (struct c_binding *b)
522 struct c_binding *prev = b->prev;
524 memset (b, 0, sizeof (struct c_binding));
525 b->prev = binding_freelist;
526 binding_freelist = b;
532 /* Hook called at end of compilation to assume 1 elt
533 for a file-scope tentative array defn that wasn't complete before. */
536 c_finish_incomplete_decl (tree decl)
538 if (TREE_CODE (decl) == VAR_DECL)
540 tree type = TREE_TYPE (decl);
541 if (type != error_mark_node
542 && TREE_CODE (type) == ARRAY_TYPE
543 && !DECL_EXTERNAL (decl)
544 && TYPE_DOMAIN (type) == 0)
546 warning (0, "array %q+D assumed to have one element", decl);
548 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
550 layout_decl (decl, 0);
555 /* The Objective-C front-end often needs to determine the current scope. */
558 objc_get_current_scope (void)
560 return current_scope;
563 /* The following function is used only by Objective-C. It needs to live here
564 because it accesses the innards of c_scope. */
567 objc_mark_locals_volatile (void *enclosing_blk)
569 struct c_scope *scope;
572 for (scope = current_scope;
573 scope && scope != enclosing_blk;
574 scope = scope->outer)
576 for (b = scope->bindings; b; b = b->prev)
577 objc_volatilize_decl (b->decl);
579 /* Do not climb up past the current function. */
580 if (scope->function_body)
585 /* Nonzero if we are currently in file scope. */
588 global_bindings_p (void)
590 return current_scope == file_scope && !c_override_global_bindings_to_false;
594 keep_next_level (void)
596 keep_next_level_flag = true;
599 /* Identify this scope as currently being filled with parameters. */
602 declare_parm_level (void)
604 current_scope->parm_flag = true;
610 if (next_is_function_body)
612 /* This is the transition from the parameters to the top level
613 of the function body. These are the same scope
614 (C99 6.2.1p4,6) so we do not push another scope structure.
615 next_is_function_body is set only by store_parm_decls, which
616 in turn is called when and only when we are about to
617 encounter the opening curly brace for the function body.
619 The outermost block of a function always gets a BLOCK node,
620 because the debugging output routines expect that each
621 function has at least one BLOCK. */
622 current_scope->parm_flag = false;
623 current_scope->function_body = true;
624 current_scope->keep = true;
625 current_scope->outer_function = current_function_scope;
626 current_function_scope = current_scope;
628 keep_next_level_flag = false;
629 next_is_function_body = false;
633 struct c_scope *scope;
636 scope = scope_freelist;
637 scope_freelist = scope->outer;
640 scope = GGC_CNEW (struct c_scope);
642 scope->keep = keep_next_level_flag;
643 scope->outer = current_scope;
644 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
646 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
648 if (current_scope && scope->depth == 0)
651 sorry ("GCC supports only %u nested scopes", scope->depth);
654 current_scope = scope;
655 keep_next_level_flag = false;
659 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
662 set_type_context (tree type, tree context)
664 for (type = TYPE_MAIN_VARIANT (type); type;
665 type = TYPE_NEXT_VARIANT (type))
666 TYPE_CONTEXT (type) = context;
669 /* Exit a scope. Restore the state of the identifier-decl mappings
670 that were in effect when this scope was entered. Return a BLOCK
671 node containing all the DECLs in this scope that are of interest
672 to debug info generation. */
677 struct c_scope *scope = current_scope;
678 tree block, context, p;
681 bool functionbody = scope->function_body;
682 bool keep = functionbody || scope->keep || scope->bindings;
684 c_end_vm_scope (scope->depth);
686 /* If appropriate, create a BLOCK to record the decls for the life
691 block = make_node (BLOCK);
692 BLOCK_SUBBLOCKS (block) = scope->blocks;
693 TREE_USED (block) = 1;
695 /* In each subblock, record that this is its superior. */
696 for (p = scope->blocks; p; p = TREE_CHAIN (p))
697 BLOCK_SUPERCONTEXT (p) = block;
699 BLOCK_VARS (block) = 0;
702 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
703 scope must be set so that they point to the appropriate
704 construct, i.e. either to the current FUNCTION_DECL node, or
705 else to the BLOCK node we just constructed.
707 Note that for tagged types whose scope is just the formal
708 parameter list for some function type specification, we can't
709 properly set their TYPE_CONTEXTs here, because we don't have a
710 pointer to the appropriate FUNCTION_TYPE node readily available
711 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
712 type nodes get set in `grokdeclarator' as soon as we have created
713 the FUNCTION_TYPE node which will represent the "scope" for these
714 "parameter list local" tagged types. */
715 if (scope->function_body)
716 context = current_function_decl;
717 else if (scope == file_scope)
719 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
720 TREE_CHAIN (file_decl) = all_translation_units;
721 all_translation_units = file_decl;
727 /* Clear all bindings in this scope. */
728 for (b = scope->bindings; b; b = free_binding_and_advance (b))
731 switch (TREE_CODE (p))
734 /* Warnings for unused labels, errors for undefined labels. */
735 if (TREE_USED (p) && !DECL_INITIAL (p))
737 error ("label %q+D used but not defined", p);
738 DECL_INITIAL (p) = error_mark_node;
741 warn_for_unused_label (p);
743 /* Labels go in BLOCK_VARS. */
744 TREE_CHAIN (p) = BLOCK_VARS (block);
745 BLOCK_VARS (block) = p;
746 gcc_assert (I_LABEL_BINDING (b->id) == b);
747 I_LABEL_BINDING (b->id) = b->shadowed;
753 set_type_context (p, context);
755 /* Types may not have tag-names, in which case the type
756 appears in the bindings list with b->id NULL. */
759 gcc_assert (I_TAG_BINDING (b->id) == b);
760 I_TAG_BINDING (b->id) = b->shadowed;
765 /* Propagate TREE_ADDRESSABLE from nested functions to their
766 containing functions. */
767 if (!TREE_ASM_WRITTEN (p)
768 && DECL_INITIAL (p) != 0
769 && TREE_ADDRESSABLE (p)
770 && DECL_ABSTRACT_ORIGIN (p) != 0
771 && DECL_ABSTRACT_ORIGIN (p) != p)
772 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
773 if (!DECL_EXTERNAL (p)
775 && scope != file_scope
776 && scope != external_scope)
778 error ("nested function %q+D declared but never defined", p);
779 undef_nested_function = true;
781 /* C99 6.7.4p6: "a function with external linkage... declared
782 with an inline function specifier ... shall also be defined in the
783 same translation unit." */
784 else if (DECL_DECLARED_INLINE_P (p)
787 && !flag_gnu89_inline)
788 pedwarn ("inline function %q+D declared but never defined", p);
793 /* Warnings for unused variables. */
795 && !TREE_NO_WARNING (p)
796 && !DECL_IN_SYSTEM_HEADER (p)
798 && !DECL_ARTIFICIAL (p)
799 && scope != file_scope
800 && scope != external_scope)
801 warning (OPT_Wunused_variable, "unused variable %q+D", p);
805 error ("type of array %q+D completed incompatibly with"
806 " implicit initialization", p);
813 /* All of these go in BLOCK_VARS, but only if this is the
814 binding in the home scope. */
817 TREE_CHAIN (p) = BLOCK_VARS (block);
818 BLOCK_VARS (block) = p;
820 /* If this is the file scope, and we are processing more
821 than one translation unit in this compilation, set
822 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
823 This makes same_translation_unit_p work, and causes
824 static declarations to be given disambiguating suffixes. */
825 if (scope == file_scope && num_in_fnames > 1)
827 DECL_CONTEXT (p) = context;
828 if (TREE_CODE (p) == TYPE_DECL)
829 set_type_context (TREE_TYPE (p), context);
833 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
834 already been put there by store_parm_decls. Unused-
835 parameter warnings are handled by function.c.
836 error_mark_node obviously does not go in BLOCK_VARS and
837 does not get unused-variable warnings. */
840 /* It is possible for a decl not to have a name. We get
841 here with b->id NULL in this case. */
844 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
845 I_SYMBOL_BINDING (b->id) = b->shadowed;
846 if (b->shadowed && b->shadowed->type)
847 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
857 /* Dispose of the block that we just made inside some higher level. */
858 if ((scope->function_body || scope == file_scope) && context)
860 DECL_INITIAL (context) = block;
861 BLOCK_SUPERCONTEXT (block) = context;
863 else if (scope->outer)
866 SCOPE_LIST_APPEND (scope->outer, blocks, block);
867 /* If we did not make a block for the scope just exited, any
868 blocks made for inner scopes must be carried forward so they
869 will later become subblocks of something else. */
870 else if (scope->blocks)
871 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
874 /* Pop the current scope, and free the structure for reuse. */
875 current_scope = scope->outer;
876 if (scope->function_body)
877 current_function_scope = scope->outer_function;
879 memset (scope, 0, sizeof (struct c_scope));
880 scope->outer = scope_freelist;
881 scope_freelist = scope;
887 push_file_scope (void)
895 file_scope = current_scope;
897 start_fname_decls ();
899 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
900 bind (DECL_NAME (decl), decl, file_scope,
901 /*invisible=*/false, /*nested=*/true);
905 pop_file_scope (void)
907 /* In case there were missing closebraces, get us back to the global
909 while (current_scope != file_scope)
912 /* __FUNCTION__ is defined at file scope (""). This
913 call may not be necessary as my tests indicate it
914 still works without it. */
915 finish_fname_decls ();
917 /* This is the point to write out a PCH if we're doing that.
918 In that case we do not want to do anything else. */
921 c_common_write_pch ();
925 /* Pop off the file scope and close this translation unit. */
929 maybe_apply_pending_pragma_weaks ();
930 cgraph_finalize_compilation_unit ();
933 /* Insert BLOCK at the end of the list of subblocks of the current
934 scope. This is used when a BIND_EXPR is expanded, to handle the
935 BLOCK node inside the BIND_EXPR. */
938 insert_block (tree block)
940 TREE_USED (block) = 1;
941 SCOPE_LIST_APPEND (current_scope, blocks, block);
944 /* Push a definition or a declaration of struct, union or enum tag "name".
945 "type" should be the type node.
946 We assume that the tag "name" is not already defined.
948 Note that the definition may really be just a forward reference.
949 In that case, the TYPE_SIZE will be zero. */
952 pushtag (tree name, tree type)
954 /* Record the identifier as the type's name if it has none. */
955 if (name && !TYPE_NAME (type))
956 TYPE_NAME (type) = name;
957 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
959 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
960 tagged type we just added to the current scope. This fake
961 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
962 to output a representation of a tagged type, and it also gives
963 us a convenient place to record the "scope start" address for the
966 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
968 /* An approximation for now, so we can tell this is a function-scope tag.
969 This will be updated in pop_scope. */
970 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
973 /* Subroutine of compare_decls. Allow harmless mismatches in return
974 and argument types provided that the type modes match. This function
975 return a unified type given a suitable match, and 0 otherwise. */
978 match_builtin_function_types (tree newtype, tree oldtype)
980 tree newrettype, oldrettype;
981 tree newargs, oldargs;
982 tree trytype, tryargs;
984 /* Accept the return type of the new declaration if same modes. */
985 oldrettype = TREE_TYPE (oldtype);
986 newrettype = TREE_TYPE (newtype);
988 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
991 oldargs = TYPE_ARG_TYPES (oldtype);
992 newargs = TYPE_ARG_TYPES (newtype);
995 while (oldargs || newargs)
999 || !TREE_VALUE (oldargs)
1000 || !TREE_VALUE (newargs)
1001 || TYPE_MODE (TREE_VALUE (oldargs))
1002 != TYPE_MODE (TREE_VALUE (newargs)))
1005 oldargs = TREE_CHAIN (oldargs);
1006 newargs = TREE_CHAIN (newargs);
1009 trytype = build_function_type (newrettype, tryargs);
1010 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1013 /* Subroutine of diagnose_mismatched_decls. Check for function type
1014 mismatch involving an empty arglist vs a nonempty one and give clearer
1017 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1018 tree newtype, tree oldtype)
1022 if (TREE_CODE (olddecl) != FUNCTION_DECL
1023 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1024 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1026 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1029 t = TYPE_ARG_TYPES (oldtype);
1031 t = TYPE_ARG_TYPES (newtype);
1032 for (; t; t = TREE_CHAIN (t))
1034 tree type = TREE_VALUE (t);
1036 if (TREE_CHAIN (t) == 0
1037 && TYPE_MAIN_VARIANT (type) != void_type_node)
1039 inform ("a parameter list with an ellipsis can%'t match "
1040 "an empty parameter name list declaration");
1044 if (c_type_promotes_to (type) != type)
1046 inform ("an argument type that has a default promotion can%'t match "
1047 "an empty parameter name list declaration");
1053 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1054 old-style function definition, NEWDECL is a prototype declaration.
1055 Diagnose inconsistencies in the argument list. Returns TRUE if
1056 the prototype is compatible, FALSE if not. */
1058 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1060 tree newargs, oldargs;
1063 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1065 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1066 newargs = TYPE_ARG_TYPES (newtype);
1071 tree oldargtype = TREE_VALUE (oldargs);
1072 tree newargtype = TREE_VALUE (newargs);
1074 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1077 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1078 newargtype = TYPE_MAIN_VARIANT (newargtype);
1080 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1083 /* Reaching the end of just one list means the two decls don't
1084 agree on the number of arguments. */
1085 if (END_OF_ARGLIST (oldargtype))
1087 error ("prototype for %q+D declares more arguments "
1088 "than previous old-style definition", newdecl);
1091 else if (END_OF_ARGLIST (newargtype))
1093 error ("prototype for %q+D declares fewer arguments "
1094 "than previous old-style definition", newdecl);
1098 /* Type for passing arg must be consistent with that declared
1100 else if (!comptypes (oldargtype, newargtype))
1102 error ("prototype for %q+D declares argument %d"
1103 " with incompatible type",
1108 oldargs = TREE_CHAIN (oldargs);
1109 newargs = TREE_CHAIN (newargs);
1113 /* If we get here, no errors were found, but do issue a warning
1114 for this poor-style construct. */
1115 warning (0, "prototype for %q+D follows non-prototype definition",
1118 #undef END_OF_ARGLIST
1121 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1122 first in a pair of mismatched declarations, using the diagnostic
1125 locate_old_decl (tree decl, void (*diag)(const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2))
1127 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1129 else if (DECL_INITIAL (decl))
1130 diag (G_("previous definition of %q+D was here"), decl);
1131 else if (C_DECL_IMPLICIT (decl))
1132 diag (G_("previous implicit declaration of %q+D was here"), decl);
1134 diag (G_("previous declaration of %q+D was here"), decl);
1137 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1138 Returns true if the caller should proceed to merge the two, false
1139 if OLDDECL should simply be discarded. As a side effect, issues
1140 all necessary diagnostics for invalid or poor-style combinations.
1141 If it returns true, writes the types of NEWDECL and OLDDECL to
1142 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1143 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1146 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1147 tree *newtypep, tree *oldtypep)
1149 tree newtype, oldtype;
1150 bool pedwarned = false;
1151 bool warned = false;
1154 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1155 && DECL_EXTERNAL (DECL))
1157 /* If we have error_mark_node for either decl or type, just discard
1158 the previous decl - we're in an error cascade already. */
1159 if (olddecl == error_mark_node || newdecl == error_mark_node)
1161 *oldtypep = oldtype = TREE_TYPE (olddecl);
1162 *newtypep = newtype = TREE_TYPE (newdecl);
1163 if (oldtype == error_mark_node || newtype == error_mark_node)
1166 /* Two different categories of symbol altogether. This is an error
1167 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1168 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1170 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1171 && DECL_BUILT_IN (olddecl)
1172 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1174 error ("%q+D redeclared as different kind of symbol", newdecl);
1175 locate_old_decl (olddecl, error);
1177 else if (TREE_PUBLIC (newdecl))
1178 warning (0, "built-in function %q+D declared as non-function",
1181 warning (OPT_Wshadow, "declaration of %q+D shadows "
1182 "a built-in function", newdecl);
1186 /* Enumerators have no linkage, so may only be declared once in a
1188 if (TREE_CODE (olddecl) == CONST_DECL)
1190 error ("redeclaration of enumerator %q+D", newdecl);
1191 locate_old_decl (olddecl, error);
1195 if (!comptypes (oldtype, newtype))
1197 if (TREE_CODE (olddecl) == FUNCTION_DECL
1198 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1200 /* Accept harmless mismatch in function types.
1201 This is for the ffs and fprintf builtins. */
1202 tree trytype = match_builtin_function_types (newtype, oldtype);
1204 if (trytype && comptypes (newtype, trytype))
1205 *oldtypep = oldtype = trytype;
1208 /* If types don't match for a built-in, throw away the
1209 built-in. No point in calling locate_old_decl here, it
1210 won't print anything. */
1211 warning (0, "conflicting types for built-in function %q+D",
1216 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1217 && DECL_IS_BUILTIN (olddecl))
1219 /* A conflicting function declaration for a predeclared
1220 function that isn't actually built in. Objective C uses
1221 these. The new declaration silently overrides everything
1222 but the volatility (i.e. noreturn) indication. See also
1223 below. FIXME: Make Objective C use normal builtins. */
1224 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1227 /* Permit void foo (...) to match int foo (...) if the latter is
1228 the definition and implicit int was used. See
1229 c-torture/compile/920625-2.c. */
1230 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1231 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1232 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1233 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1235 pedwarn ("conflicting types for %q+D", newdecl);
1236 /* Make sure we keep void as the return type. */
1237 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1238 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1241 /* Permit void foo (...) to match an earlier call to foo (...) with
1242 no declared type (thus, implicitly int). */
1243 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1244 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1245 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1246 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1248 pedwarn ("conflicting types for %q+D", newdecl);
1249 /* Make sure we keep void as the return type. */
1250 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1255 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1256 error ("conflicting type qualifiers for %q+D", newdecl);
1258 error ("conflicting types for %q+D", newdecl);
1259 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1260 locate_old_decl (olddecl, error);
1265 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1266 but silently ignore the redeclaration if either is in a system
1267 header. (Conflicting redeclarations were handled above.) */
1268 if (TREE_CODE (newdecl) == TYPE_DECL)
1270 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1271 return true; /* Allow OLDDECL to continue in use. */
1273 error ("redefinition of typedef %q+D", newdecl);
1274 locate_old_decl (olddecl, error);
1278 /* Function declarations can either be 'static' or 'extern' (no
1279 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1280 can never conflict with each other on account of linkage
1281 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1282 gnu89 mode permits two definitions if one is 'extern inline' and
1283 one is not. The non- extern-inline definition supersedes the
1284 extern-inline definition. */
1286 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1288 /* If you declare a built-in function name as static, or
1289 define the built-in with an old-style definition (so we
1290 can't validate the argument list) the built-in definition is
1291 overridden, but optionally warn this was a bad choice of name. */
1292 if (DECL_BUILT_IN (olddecl)
1293 && !C_DECL_DECLARED_BUILTIN (olddecl)
1294 && (!TREE_PUBLIC (newdecl)
1295 || (DECL_INITIAL (newdecl)
1296 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1298 warning (OPT_Wshadow, "declaration of %q+D shadows "
1299 "a built-in function", newdecl);
1300 /* Discard the old built-in function. */
1304 if (DECL_INITIAL (newdecl))
1306 if (DECL_INITIAL (olddecl))
1308 /* If both decls are in the same TU and the new declaration
1309 isn't overriding an extern inline reject the new decl.
1310 In c99, no overriding is allowed in the same translation
1312 if ((!DECL_EXTERN_INLINE (olddecl)
1313 || DECL_EXTERN_INLINE (newdecl)
1314 || (!flag_gnu89_inline
1315 && (!DECL_DECLARED_INLINE_P (olddecl)
1316 || !lookup_attribute ("gnu_inline",
1317 DECL_ATTRIBUTES (olddecl)))
1318 && (!DECL_DECLARED_INLINE_P (newdecl)
1319 || !lookup_attribute ("gnu_inline",
1320 DECL_ATTRIBUTES (newdecl))))
1322 && same_translation_unit_p (newdecl, olddecl))
1324 error ("redefinition of %q+D", newdecl);
1325 locate_old_decl (olddecl, error);
1330 /* If we have a prototype after an old-style function definition,
1331 the argument types must be checked specially. */
1332 else if (DECL_INITIAL (olddecl)
1333 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1334 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1335 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1337 locate_old_decl (olddecl, error);
1340 /* A non-static declaration (even an "extern") followed by a
1341 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1342 The same is true for a static forward declaration at block
1343 scope followed by a non-static declaration/definition at file
1344 scope. Static followed by non-static at the same scope is
1345 not undefined behavior, and is the most convenient way to get
1346 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1347 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1348 we do diagnose it if -Wtraditional. */
1349 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1351 /* Two exceptions to the rule. If olddecl is an extern
1352 inline, or a predeclared function that isn't actually
1353 built in, newdecl silently overrides olddecl. The latter
1354 occur only in Objective C; see also above. (FIXME: Make
1355 Objective C use normal builtins.) */
1356 if (!DECL_IS_BUILTIN (olddecl)
1357 && !DECL_EXTERN_INLINE (olddecl))
1359 error ("static declaration of %q+D follows "
1360 "non-static declaration", newdecl);
1361 locate_old_decl (olddecl, error);
1365 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1367 if (DECL_CONTEXT (olddecl))
1369 error ("non-static declaration of %q+D follows "
1370 "static declaration", newdecl);
1371 locate_old_decl (olddecl, error);
1374 else if (warn_traditional)
1376 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1377 "follows static declaration", newdecl);
1382 /* Make sure gnu_inline attribute is either not present, or
1383 present on all inline decls. */
1384 if (DECL_DECLARED_INLINE_P (olddecl)
1385 && DECL_DECLARED_INLINE_P (newdecl))
1387 bool newa = lookup_attribute ("gnu_inline",
1388 DECL_ATTRIBUTES (newdecl)) != NULL;
1389 bool olda = lookup_attribute ("gnu_inline",
1390 DECL_ATTRIBUTES (olddecl)) != NULL;
1393 error ("%<gnu_inline%> attribute present on %q+D",
1394 newa ? newdecl : olddecl);
1395 error ("%Jbut not here", newa ? olddecl : newdecl);
1399 else if (TREE_CODE (newdecl) == VAR_DECL)
1401 /* Only variables can be thread-local, and all declarations must
1402 agree on this property. */
1403 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1405 /* Nothing to check. Since OLDDECL is marked threadprivate
1406 and NEWDECL does not have a thread-local attribute, we
1407 will merge the threadprivate attribute into NEWDECL. */
1410 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1412 if (DECL_THREAD_LOCAL_P (newdecl))
1413 error ("thread-local declaration of %q+D follows "
1414 "non-thread-local declaration", newdecl);
1416 error ("non-thread-local declaration of %q+D follows "
1417 "thread-local declaration", newdecl);
1419 locate_old_decl (olddecl, error);
1423 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1424 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1426 error ("redefinition of %q+D", newdecl);
1427 locate_old_decl (olddecl, error);
1431 /* Objects declared at file scope: if the first declaration had
1432 external linkage (even if it was an external reference) the
1433 second must have external linkage as well, or the behavior is
1434 undefined. If the first declaration had internal linkage, then
1435 the second must too, or else be an external reference (in which
1436 case the composite declaration still has internal linkage).
1437 As for function declarations, we warn about the static-then-
1438 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1439 if (DECL_FILE_SCOPE_P (newdecl)
1440 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1442 if (DECL_EXTERNAL (newdecl))
1444 if (!DECL_FILE_SCOPE_P (olddecl))
1446 error ("extern declaration of %q+D follows "
1447 "declaration with no linkage", newdecl);
1448 locate_old_decl (olddecl, error);
1451 else if (warn_traditional)
1453 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1454 "follows static declaration", newdecl);
1460 if (TREE_PUBLIC (newdecl))
1461 error ("non-static declaration of %q+D follows "
1462 "static declaration", newdecl);
1464 error ("static declaration of %q+D follows "
1465 "non-static declaration", newdecl);
1467 locate_old_decl (olddecl, error);
1471 /* Two objects with the same name declared at the same block
1472 scope must both be external references (6.7p3). */
1473 else if (!DECL_FILE_SCOPE_P (newdecl))
1475 if (DECL_EXTERNAL (newdecl))
1477 /* Extern with initializer at block scope, which will
1478 already have received an error. */
1480 else if (DECL_EXTERNAL (olddecl))
1482 error ("declaration of %q+D with no linkage follows "
1483 "extern declaration", newdecl);
1484 locate_old_decl (olddecl, error);
1488 error ("redeclaration of %q+D with no linkage", newdecl);
1489 locate_old_decl (olddecl, error);
1497 /* All decls must agree on a visibility. */
1498 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
1499 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1500 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1502 warning (0, "redeclaration of %q+D with different visibility "
1503 "(old visibility preserved)", newdecl);
1507 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1509 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1510 if (DECL_DECLARED_INLINE_P (newdecl)
1511 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1513 warning (OPT_Wattributes, "inline declaration of %qD follows "
1514 "declaration with attribute noinline", newdecl);
1517 else if (DECL_DECLARED_INLINE_P (olddecl)
1518 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1520 warning (OPT_Wattributes, "declaration of %q+D with attribute "
1521 "noinline follows inline declaration ", newdecl);
1525 /* Inline declaration after use or definition.
1526 ??? Should we still warn about this now we have unit-at-a-time
1527 mode and can get it right?
1528 Definitely don't complain if the decls are in different translation
1530 C99 permits this, so don't warn in that case. (The function
1531 may not be inlined everywhere in function-at-a-time mode, but
1532 we still shouldn't warn.) */
1533 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1534 && same_translation_unit_p (olddecl, newdecl)
1535 && flag_gnu89_inline)
1537 if (TREE_USED (olddecl))
1539 warning (0, "%q+D declared inline after being called", olddecl);
1542 else if (DECL_INITIAL (olddecl))
1544 warning (0, "%q+D declared inline after its definition", olddecl);
1549 else /* PARM_DECL, VAR_DECL */
1551 /* Redeclaration of a parameter is a constraint violation (this is
1552 not explicitly stated, but follows from C99 6.7p3 [no more than
1553 one declaration of the same identifier with no linkage in the
1554 same scope, except type tags] and 6.2.2p6 [parameters have no
1555 linkage]). We must check for a forward parameter declaration,
1556 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1557 an extension, the mandatory diagnostic for which is handled by
1558 mark_forward_parm_decls. */
1560 if (TREE_CODE (newdecl) == PARM_DECL
1561 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1563 error ("redefinition of parameter %q+D", newdecl);
1564 locate_old_decl (olddecl, error);
1569 /* Optional warning for completely redundant decls. */
1570 if (!warned && !pedwarned
1571 && warn_redundant_decls
1572 /* Don't warn about a function declaration followed by a
1574 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1575 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1576 /* Don't warn about redundant redeclarations of builtins. */
1577 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1578 && !DECL_BUILT_IN (newdecl)
1579 && DECL_BUILT_IN (olddecl)
1580 && !C_DECL_DECLARED_BUILTIN (olddecl))
1581 /* Don't warn about an extern followed by a definition. */
1582 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1583 /* Don't warn about forward parameter decls. */
1584 && !(TREE_CODE (newdecl) == PARM_DECL
1585 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1586 /* Don't warn about a variable definition following a declaration. */
1587 && !(TREE_CODE (newdecl) == VAR_DECL
1588 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
1590 warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
1595 /* Report location of previous decl/defn in a consistent manner. */
1596 if (warned || pedwarned)
1597 locate_old_decl (olddecl, pedwarned ? pedwarn : warning0);
1599 #undef DECL_EXTERN_INLINE
1604 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1605 consistent with OLDDECL, but carries new information. Merge the
1606 new information into OLDDECL. This function issues no
1610 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1612 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1613 && DECL_INITIAL (newdecl) != 0);
1614 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
1615 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
1616 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
1617 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
1618 bool extern_changed = false;
1620 /* For real parm decl following a forward decl, rechain the old decl
1621 in its new location and clear TREE_ASM_WRITTEN (it's not a
1622 forward decl anymore). */
1623 if (TREE_CODE (newdecl) == PARM_DECL
1624 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1626 struct c_binding *b, **here;
1628 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1629 if ((*here)->decl == olddecl)
1636 b->prev = current_scope->bindings;
1637 current_scope->bindings = b;
1639 TREE_ASM_WRITTEN (olddecl) = 0;
1642 DECL_ATTRIBUTES (newdecl)
1643 = targetm.merge_decl_attributes (olddecl, newdecl);
1645 /* Merge the data types specified in the two decls. */
1647 = TREE_TYPE (olddecl)
1648 = composite_type (newtype, oldtype);
1650 /* Lay the type out, unless already done. */
1651 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1653 if (TREE_TYPE (newdecl) != error_mark_node)
1654 layout_type (TREE_TYPE (newdecl));
1655 if (TREE_CODE (newdecl) != FUNCTION_DECL
1656 && TREE_CODE (newdecl) != TYPE_DECL
1657 && TREE_CODE (newdecl) != CONST_DECL)
1658 layout_decl (newdecl, 0);
1662 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1663 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1664 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1665 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1666 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1668 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1669 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1674 /* Merge the type qualifiers. */
1675 if (TREE_READONLY (newdecl))
1676 TREE_READONLY (olddecl) = 1;
1678 if (TREE_THIS_VOLATILE (newdecl))
1679 TREE_THIS_VOLATILE (olddecl) = 1;
1681 /* Merge deprecatedness. */
1682 if (TREE_DEPRECATED (newdecl))
1683 TREE_DEPRECATED (olddecl) = 1;
1685 /* Keep source location of definition rather than declaration and of
1686 prototype rather than non-prototype unless that prototype is
1688 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1689 || (old_is_prototype && !new_is_prototype
1690 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1691 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1693 /* Merge the initialization information. */
1694 if (DECL_INITIAL (newdecl) == 0)
1695 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1697 /* Merge the threadprivate attribute. */
1698 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
1700 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1701 C_DECL_THREADPRIVATE_P (newdecl) = 1;
1704 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1706 /* Merge the unused-warning information. */
1707 if (DECL_IN_SYSTEM_HEADER (olddecl))
1708 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1709 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1710 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1712 /* Merge the section attribute.
1713 We want to issue an error if the sections conflict but that
1714 must be done later in decl_attributes since we are called
1715 before attributes are assigned. */
1716 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1717 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1719 /* Copy the assembler name.
1720 Currently, it can only be defined in the prototype. */
1721 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1723 /* Use visibility of whichever declaration had it specified */
1724 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1726 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1727 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1730 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1732 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1733 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1734 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1735 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1736 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1737 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1738 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1739 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1740 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1741 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1744 /* Merge the storage class information. */
1745 merge_weak (newdecl, olddecl);
1747 /* For functions, static overrides non-static. */
1748 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1750 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1751 /* This is since we don't automatically
1752 copy the attributes of NEWDECL into OLDDECL. */
1753 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1754 /* If this clears `static', clear it in the identifier too. */
1755 if (!TREE_PUBLIC (olddecl))
1756 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1760 /* In c99, 'extern' declaration before (or after) 'inline' means this
1761 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1763 if (TREE_CODE (newdecl) == FUNCTION_DECL
1764 && !flag_gnu89_inline
1765 && (DECL_DECLARED_INLINE_P (newdecl)
1766 || DECL_DECLARED_INLINE_P (olddecl))
1767 && (!DECL_DECLARED_INLINE_P (newdecl)
1768 || !DECL_DECLARED_INLINE_P (olddecl)
1769 || !DECL_EXTERNAL (olddecl))
1770 && DECL_EXTERNAL (newdecl)
1771 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl)))
1772 DECL_EXTERNAL (newdecl) = 0;
1774 if (DECL_EXTERNAL (newdecl))
1776 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1777 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1779 /* An extern decl does not override previous storage class. */
1780 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1781 if (!DECL_EXTERNAL (newdecl))
1783 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1784 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1789 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1790 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1793 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1795 /* If we're redefining a function previously defined as extern
1796 inline, make sure we emit debug info for the inline before we
1797 throw it away, in case it was inlined into a function that
1798 hasn't been written out yet. */
1799 if (new_is_definition && DECL_INITIAL (olddecl))
1801 if (TREE_USED (olddecl)
1802 /* In unit-at-a-time mode we never inline re-defined extern
1803 inline functions. */
1804 && !flag_unit_at_a_time
1805 && cgraph_function_possibly_inlined_p (olddecl))
1806 (*debug_hooks->outlining_inline_function) (olddecl);
1808 /* The new defn must not be inline. */
1809 DECL_INLINE (newdecl) = 0;
1810 DECL_UNINLINABLE (newdecl) = 1;
1814 /* If either decl says `inline', this fn is inline, unless
1815 its definition was passed already. */
1816 if (DECL_DECLARED_INLINE_P (newdecl)
1817 || DECL_DECLARED_INLINE_P (olddecl))
1818 DECL_DECLARED_INLINE_P (newdecl) = 1;
1820 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1821 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1823 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1824 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1825 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1826 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1829 if (DECL_BUILT_IN (olddecl))
1831 /* If redeclaring a builtin function, it stays built in.
1832 But it gets tagged as having been declared. */
1833 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1834 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1835 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1836 if (new_is_prototype)
1837 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1839 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1840 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1843 /* Also preserve various other info from the definition. */
1844 if (!new_is_definition)
1846 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1847 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1848 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1849 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1850 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1852 /* Set DECL_INLINE on the declaration if we've got a body
1853 from which to instantiate. */
1854 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1856 DECL_INLINE (newdecl) = 1;
1857 DECL_ABSTRACT_ORIGIN (newdecl)
1858 = DECL_ABSTRACT_ORIGIN (olddecl);
1863 /* If a previous declaration said inline, mark the
1864 definition as inlinable. */
1865 if (DECL_DECLARED_INLINE_P (newdecl)
1866 && !DECL_UNINLINABLE (newdecl))
1867 DECL_INLINE (newdecl) = 1;
1871 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
1873 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1874 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1876 unsigned olddecl_uid = DECL_UID (olddecl);
1877 tree olddecl_context = DECL_CONTEXT (olddecl);
1879 memcpy ((char *) olddecl + sizeof (struct tree_common),
1880 (char *) newdecl + sizeof (struct tree_common),
1881 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1882 switch (TREE_CODE (olddecl))
1892 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1893 (char *) newdecl + sizeof (struct tree_decl_common),
1894 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1899 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1900 (char *) newdecl + sizeof (struct tree_decl_common),
1901 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1903 DECL_UID (olddecl) = olddecl_uid;
1904 DECL_CONTEXT (olddecl) = olddecl_context;
1907 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1908 so that encode_section_info has a chance to look at the new decl
1909 flags and attributes. */
1910 if (DECL_RTL_SET_P (olddecl)
1911 && (TREE_CODE (olddecl) == FUNCTION_DECL
1912 || (TREE_CODE (olddecl) == VAR_DECL
1913 && TREE_STATIC (olddecl))))
1914 make_decl_rtl (olddecl);
1916 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1917 and the definition is coming from the old version, cgraph needs
1918 to be called again. */
1919 if (extern_changed && !new_is_definition
1920 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
1921 cgraph_finalize_function (olddecl, false);
1924 /* Handle when a new declaration NEWDECL has the same name as an old
1925 one OLDDECL in the same binding contour. Prints an error message
1928 If safely possible, alter OLDDECL to look like NEWDECL, and return
1929 true. Otherwise, return false. */
1932 duplicate_decls (tree newdecl, tree olddecl)
1934 tree newtype = NULL, oldtype = NULL;
1936 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1938 /* Avoid `unused variable' and other warnings for OLDDECL. */
1939 TREE_NO_WARNING (olddecl) = 1;
1943 merge_decls (newdecl, olddecl, newtype, oldtype);
1948 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1950 warn_if_shadowing (tree new_decl)
1952 struct c_binding *b;
1954 /* Shadow warnings wanted? */
1956 /* No shadow warnings for internally generated vars. */
1957 || DECL_IS_BUILTIN (new_decl)
1958 /* No shadow warnings for vars made for inlining. */
1959 || DECL_FROM_INLINE (new_decl))
1962 /* Is anything being shadowed? Invisible decls do not count. */
1963 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1964 if (b->decl && b->decl != new_decl && !b->invisible)
1966 tree old_decl = b->decl;
1968 if (old_decl == error_mark_node)
1970 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1971 "non-variable", new_decl);
1974 else if (TREE_CODE (old_decl) == PARM_DECL)
1975 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
1977 else if (DECL_FILE_SCOPE_P (old_decl))
1978 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
1979 "declaration", new_decl);
1980 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1981 && DECL_BUILT_IN (old_decl))
1983 warning (OPT_Wshadow, "declaration of %q+D shadows "
1984 "a built-in function", new_decl);
1988 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
1991 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
1998 /* Subroutine of pushdecl.
2000 X is a TYPE_DECL for a typedef statement. Create a brand new
2001 ..._TYPE node (which will be just a variant of the existing
2002 ..._TYPE node with identical properties) and then install X
2003 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2005 The whole point here is to end up with a situation where each
2006 and every ..._TYPE node the compiler creates will be uniquely
2007 associated with AT MOST one node representing a typedef name.
2008 This way, even though the compiler substitutes corresponding
2009 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2010 early on, later parts of the compiler can always do the reverse
2011 translation and get back the corresponding typedef name. For
2014 typedef struct S MY_TYPE;
2017 Later parts of the compiler might only know that `object' was of
2018 type `struct S' if it were not for code just below. With this
2019 code however, later parts of the compiler see something like:
2021 struct S' == struct S
2022 typedef struct S' MY_TYPE;
2025 And they can then deduce (from the node for type struct S') that
2026 the original object declaration was:
2030 Being able to do this is important for proper support of protoize,
2031 and also for generating precise symbolic debugging information
2032 which takes full account of the programmer's (typedef) vocabulary.
2034 Obviously, we don't want to generate a duplicate ..._TYPE node if
2035 the TYPE_DECL node that we are now processing really represents a
2036 standard built-in type. */
2039 clone_underlying_type (tree x)
2041 if (DECL_IS_BUILTIN (x))
2043 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2044 TYPE_NAME (TREE_TYPE (x)) = x;
2046 else if (TREE_TYPE (x) != error_mark_node
2047 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2049 tree tt = TREE_TYPE (x);
2050 DECL_ORIGINAL_TYPE (x) = tt;
2051 tt = build_variant_type_copy (tt);
2053 TREE_USED (tt) = TREE_USED (x);
2058 /* Record a decl-node X as belonging to the current lexical scope.
2059 Check for errors (such as an incompatible declaration for the same
2060 name already seen in the same scope).
2062 Returns either X or an old decl for the same name.
2063 If an old decl is returned, it may have been smashed
2064 to agree with what X says. */
2069 tree name = DECL_NAME (x);
2070 struct c_scope *scope = current_scope;
2071 struct c_binding *b;
2072 bool nested = false;
2074 /* Functions need the lang_decl data. */
2075 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
2076 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
2078 /* Must set DECL_CONTEXT for everything not at file scope or
2079 DECL_FILE_SCOPE_P won't work. Local externs don't count
2080 unless they have initializers (which generate code). */
2081 if (current_function_decl
2082 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2083 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2084 DECL_CONTEXT (x) = current_function_decl;
2086 /* If this is of variably modified type, prevent jumping into its
2088 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2089 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2090 c_begin_vm_scope (scope->depth);
2092 /* Anonymous decls are just inserted in the scope. */
2095 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
2099 /* First, see if there is another declaration with the same name in
2100 the current scope. If there is, duplicate_decls may do all the
2101 work for us. If duplicate_decls returns false, that indicates
2102 two incompatible decls in the same scope; we are to silently
2103 replace the old one (duplicate_decls has issued all appropriate
2104 diagnostics). In particular, we should not consider possible
2105 duplicates in the external scope, or shadowing. */
2106 b = I_SYMBOL_BINDING (name);
2107 if (b && B_IN_SCOPE (b, scope))
2109 struct c_binding *b_ext, *b_use;
2110 tree type = TREE_TYPE (x);
2111 tree visdecl = b->decl;
2112 tree vistype = TREE_TYPE (visdecl);
2113 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2114 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2115 b->inner_comp = false;
2118 /* If this is an external linkage declaration, we should check
2119 for compatibility with the type in the external scope before
2120 setting the type at this scope based on the visible
2121 information only. */
2122 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2124 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2125 b_ext = b_ext->shadowed;
2130 TREE_TYPE (b_use->decl) = b_use->type;
2133 if (duplicate_decls (x, b_use->decl))
2137 /* Save the updated type in the external scope and
2138 restore the proper type for this scope. */
2140 if (comptypes (vistype, type))
2141 thistype = composite_type (vistype, type);
2143 thistype = TREE_TYPE (b_use->decl);
2144 b_use->type = TREE_TYPE (b_use->decl);
2145 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2146 && DECL_BUILT_IN (b_use->decl))
2148 = build_type_attribute_variant (thistype,
2151 TREE_TYPE (b_use->decl) = thistype;
2156 goto skip_external_and_shadow_checks;
2159 /* All declarations with external linkage, and all external
2160 references, go in the external scope, no matter what scope is
2161 current. However, the binding in that scope is ignored for
2162 purposes of normal name lookup. A separate binding structure is
2163 created in the requested scope; this governs the normal
2164 visibility of the symbol.
2166 The binding in the externals scope is used exclusively for
2167 detecting duplicate declarations of the same object, no matter
2168 what scope they are in; this is what we do here. (C99 6.2.7p2:
2169 All declarations that refer to the same object or function shall
2170 have compatible type; otherwise, the behavior is undefined.) */
2171 if (DECL_EXTERNAL (x) || scope == file_scope)
2173 tree type = TREE_TYPE (x);
2176 bool type_saved = false;
2177 if (b && !B_IN_EXTERNAL_SCOPE (b)
2178 && (TREE_CODE (b->decl) == FUNCTION_DECL
2179 || TREE_CODE (b->decl) == VAR_DECL)
2180 && DECL_FILE_SCOPE_P (b->decl))
2183 vistype = TREE_TYPE (visdecl);
2185 if (scope != file_scope
2186 && !DECL_IN_SYSTEM_HEADER (x))
2187 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2189 while (b && !B_IN_EXTERNAL_SCOPE (b))
2191 /* If this decl might be modified, save its type. This is
2192 done here rather than when the decl is first bound
2193 because the type may change after first binding, through
2194 being completed or through attributes being added. If we
2195 encounter multiple such decls, only the first should have
2196 its type saved; the others will already have had their
2197 proper types saved and the types will not have changed as
2198 their scopes will not have been re-entered. */
2199 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2201 b->type = TREE_TYPE (b->decl);
2204 if (B_IN_FILE_SCOPE (b)
2205 && TREE_CODE (b->decl) == VAR_DECL
2206 && TREE_STATIC (b->decl)
2207 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2208 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2209 && TREE_CODE (type) == ARRAY_TYPE
2210 && TYPE_DOMAIN (type)
2211 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2212 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2214 /* Array type completed in inner scope, which should be
2215 diagnosed if the completion does not have size 1 and
2216 it does not get completed in the file scope. */
2217 b->inner_comp = true;
2222 /* If a matching external declaration has been found, set its
2223 type to the composite of all the types of that declaration.
2224 After the consistency checks, it will be reset to the
2225 composite of the visible types only. */
2226 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2228 TREE_TYPE (b->decl) = b->type;
2230 /* The point of the same_translation_unit_p check here is,
2231 we want to detect a duplicate decl for a construct like
2232 foo() { extern bar(); } ... static bar(); but not if
2233 they are in different translation units. In any case,
2234 the static does not go in the externals scope. */
2236 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2237 && duplicate_decls (x, b->decl))
2242 if (comptypes (vistype, type))
2243 thistype = composite_type (vistype, type);
2245 thistype = TREE_TYPE (b->decl);
2249 b->type = TREE_TYPE (b->decl);
2250 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2252 = build_type_attribute_variant (thistype,
2253 TYPE_ATTRIBUTES (b->type));
2254 TREE_TYPE (b->decl) = thistype;
2255 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2258 else if (TREE_PUBLIC (x))
2260 if (visdecl && !b && duplicate_decls (x, visdecl))
2262 /* An external declaration at block scope referring to a
2263 visible entity with internal linkage. The composite
2264 type will already be correct for this scope, so we
2265 just need to fall through to make the declaration in
2272 bind (name, x, external_scope, /*invisible=*/true,
2279 if (TREE_CODE (x) != PARM_DECL)
2280 warn_if_shadowing (x);
2282 skip_external_and_shadow_checks:
2283 if (TREE_CODE (x) == TYPE_DECL)
2284 clone_underlying_type (x);
2286 bind (name, x, scope, /*invisible=*/false, nested);
2288 /* If x's type is incomplete because it's based on a
2289 structure or union which has not yet been fully declared,
2290 attach it to that structure or union type, so we can go
2291 back and complete the variable declaration later, if the
2292 structure or union gets fully declared.
2294 If the input is erroneous, we can have error_mark in the type
2295 slot (e.g. "f(void a, ...)") - that doesn't count as an
2297 if (TREE_TYPE (x) != error_mark_node
2298 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2300 tree element = TREE_TYPE (x);
2302 while (TREE_CODE (element) == ARRAY_TYPE)
2303 element = TREE_TYPE (element);
2304 element = TYPE_MAIN_VARIANT (element);
2306 if ((TREE_CODE (element) == RECORD_TYPE
2307 || TREE_CODE (element) == UNION_TYPE)
2308 && (TREE_CODE (x) != TYPE_DECL
2309 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2310 && !COMPLETE_TYPE_P (element))
2311 C_TYPE_INCOMPLETE_VARS (element)
2312 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2317 /* Record X as belonging to file scope.
2318 This is used only internally by the Objective-C front end,
2319 and is limited to its needs. duplicate_decls is not called;
2320 if there is any preexisting decl for this identifier, it is an ICE. */
2323 pushdecl_top_level (tree x)
2326 bool nested = false;
2327 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2329 name = DECL_NAME (x);
2331 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2333 if (TREE_PUBLIC (x))
2335 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2339 bind (name, x, file_scope, /*invisible=*/false, nested);
2345 implicit_decl_warning (tree id, tree olddecl)
2347 if (warn_implicit_function_declaration)
2350 pedwarn (G_("implicit declaration of function %qE"), id);
2352 warning (OPT_Wimplicit_function_declaration,
2353 G_("implicit declaration of function %qE"), id);
2355 locate_old_decl (olddecl, inform);
2359 /* Generate an implicit declaration for identifier FUNCTIONID as a
2360 function of type int (). */
2363 implicitly_declare (tree functionid)
2365 struct c_binding *b;
2369 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2371 if (B_IN_SCOPE (b, external_scope))
2380 if (decl == error_mark_node)
2383 /* FIXME: Objective-C has weird not-really-builtin functions
2384 which are supposed to be visible automatically. They wind up
2385 in the external scope because they're pushed before the file
2386 scope gets created. Catch this here and rebind them into the
2388 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2390 bind (functionid, decl, file_scope,
2391 /*invisible=*/false, /*nested=*/true);
2396 tree newtype = default_function_type;
2398 TREE_TYPE (decl) = b->type;
2399 /* Implicit declaration of a function already declared
2400 (somehow) in a different scope, or as a built-in.
2401 If this is the first time this has happened, warn;
2402 then recycle the old declaration but with the new type. */
2403 if (!C_DECL_IMPLICIT (decl))
2405 implicit_decl_warning (functionid, decl);
2406 C_DECL_IMPLICIT (decl) = 1;
2408 if (DECL_BUILT_IN (decl))
2410 newtype = build_type_attribute_variant (newtype,
2412 (TREE_TYPE (decl)));
2413 if (!comptypes (newtype, TREE_TYPE (decl)))
2415 warning (0, "incompatible implicit declaration of built-in"
2416 " function %qD", decl);
2417 newtype = TREE_TYPE (decl);
2422 if (!comptypes (newtype, TREE_TYPE (decl)))
2424 error ("incompatible implicit declaration of function %qD",
2426 locate_old_decl (decl, error);
2429 b->type = TREE_TYPE (decl);
2430 TREE_TYPE (decl) = newtype;
2431 bind (functionid, decl, current_scope,
2432 /*invisible=*/false, /*nested=*/true);
2437 /* Not seen before. */
2438 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2439 DECL_EXTERNAL (decl) = 1;
2440 TREE_PUBLIC (decl) = 1;
2441 C_DECL_IMPLICIT (decl) = 1;
2442 implicit_decl_warning (functionid, 0);
2443 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2445 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2447 /* C89 says implicit declarations are in the innermost block.
2448 So we record the decl in the standard fashion. */
2449 decl = pushdecl (decl);
2451 /* No need to call objc_check_decl here - it's a function type. */
2452 rest_of_decl_compilation (decl, 0, 0);
2454 /* Write a record describing this implicit function declaration
2455 to the prototypes file (if requested). */
2456 gen_aux_info_record (decl, 0, 1, 0);
2458 /* Possibly apply some default attributes to this implicit declaration. */
2459 decl_attributes (&decl, NULL_TREE, 0);
2464 /* Issue an error message for a reference to an undeclared variable
2465 ID, including a reference to a builtin outside of function-call
2466 context. Establish a binding of the identifier to error_mark_node
2467 in an appropriate scope, which will suppress further errors for the
2468 same identifier. The error message should be given location LOC. */
2470 undeclared_variable (tree id, location_t loc)
2472 static bool already = false;
2473 struct c_scope *scope;
2475 if (current_function_decl == 0)
2477 error ("%H%qE undeclared here (not in a function)", &loc, id);
2478 scope = current_scope;
2482 error ("%H%qE undeclared (first use in this function)", &loc, id);
2486 error ("%H(Each undeclared identifier is reported only once", &loc);
2487 error ("%Hfor each function it appears in.)", &loc);
2491 /* If we are parsing old-style parameter decls, current_function_decl
2492 will be nonnull but current_function_scope will be null. */
2493 scope = current_function_scope ? current_function_scope : current_scope;
2495 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2498 /* Subroutine of lookup_label, declare_label, define_label: construct a
2499 LABEL_DECL with all the proper frills. */
2502 make_label (tree name, location_t location)
2504 tree label = build_decl (LABEL_DECL, name, void_type_node);
2506 DECL_CONTEXT (label) = current_function_decl;
2507 DECL_MODE (label) = VOIDmode;
2508 DECL_SOURCE_LOCATION (label) = location;
2513 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2514 Create one if none exists so far for the current function.
2515 This is called when a label is used in a goto expression or
2516 has its address taken. */
2519 lookup_label (tree name)
2523 if (current_function_decl == 0)
2525 error ("label %qE referenced outside of any function", name);
2529 /* Use a label already defined or ref'd with this name, but not if
2530 it is inherited from a containing function and wasn't declared
2532 label = I_LABEL_DECL (name);
2533 if (label && (DECL_CONTEXT (label) == current_function_decl
2534 || C_DECLARED_LABEL_FLAG (label)))
2536 /* If the label has only been declared, update its apparent
2537 location to point here, for better diagnostics if it
2538 turns out not to have been defined. */
2539 if (!TREE_USED (label))
2540 DECL_SOURCE_LOCATION (label) = input_location;
2544 /* No label binding for that identifier; make one. */
2545 label = make_label (name, input_location);
2547 /* Ordinary labels go in the current function scope. */
2548 bind (name, label, current_function_scope,
2549 /*invisible=*/false, /*nested=*/false);
2553 /* Make a label named NAME in the current function, shadowing silently
2554 any that may be inherited from containing functions or containing
2555 scopes. This is called for __label__ declarations. */
2558 declare_label (tree name)
2560 struct c_binding *b = I_LABEL_BINDING (name);
2563 /* Check to make sure that the label hasn't already been declared
2565 if (b && B_IN_CURRENT_SCOPE (b))
2567 error ("duplicate label declaration %qE", name);
2568 locate_old_decl (b->decl, error);
2570 /* Just use the previous declaration. */
2574 label = make_label (name, input_location);
2575 C_DECLARED_LABEL_FLAG (label) = 1;
2577 /* Declared labels go in the current scope. */
2578 bind (name, label, current_scope,
2579 /*invisible=*/false, /*nested=*/false);
2583 /* Define a label, specifying the location in the source file.
2584 Return the LABEL_DECL node for the label, if the definition is valid.
2585 Otherwise return 0. */
2588 define_label (location_t location, tree name)
2590 /* Find any preexisting label with this name. It is an error
2591 if that label has already been defined in this function, or
2592 if there is a containing function with a declared label with
2594 tree label = I_LABEL_DECL (name);
2595 struct c_label_list *nlist_se, *nlist_vm;
2598 && ((DECL_CONTEXT (label) == current_function_decl
2599 && DECL_INITIAL (label) != 0)
2600 || (DECL_CONTEXT (label) != current_function_decl
2601 && C_DECLARED_LABEL_FLAG (label))))
2603 error ("%Hduplicate label %qD", &location, label);
2604 locate_old_decl (label, error);
2607 else if (label && DECL_CONTEXT (label) == current_function_decl)
2609 /* The label has been used or declared already in this function,
2610 but not defined. Update its location to point to this
2612 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2613 error ("%Jjump into statement expression", label);
2614 if (C_DECL_UNDEFINABLE_VM (label))
2615 error ("%Jjump into scope of identifier with variably modified type",
2617 DECL_SOURCE_LOCATION (label) = location;
2621 /* No label binding for that identifier; make one. */
2622 label = make_label (name, location);
2624 /* Ordinary labels go in the current function scope. */
2625 bind (name, label, current_function_scope,
2626 /*invisible=*/false, /*nested=*/false);
2629 if (!in_system_header && lookup_name (name))
2630 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2631 "for labels, identifier %qE conflicts", &location, name);
2633 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2634 nlist_se->next = label_context_stack_se->labels_def;
2635 nlist_se->label = label;
2636 label_context_stack_se->labels_def = nlist_se;
2638 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2639 nlist_vm->next = label_context_stack_vm->labels_def;
2640 nlist_vm->label = label;
2641 label_context_stack_vm->labels_def = nlist_vm;
2643 /* Mark label as having been defined. */
2644 DECL_INITIAL (label) = error_mark_node;
2648 /* Given NAME, an IDENTIFIER_NODE,
2649 return the structure (or union or enum) definition for that name.
2650 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2651 CODE says which kind of type the caller wants;
2652 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2653 If the wrong kind of type is found, an error is reported. */
2656 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2658 struct c_binding *b = I_TAG_BINDING (name);
2664 /* We only care about whether it's in this level if
2665 thislevel_only was set or it might be a type clash. */
2666 if (thislevel_only || TREE_CODE (b->decl) != code)
2668 /* For our purposes, a tag in the external scope is the same as
2669 a tag in the file scope. (Primarily relevant to Objective-C
2670 and its builtin structure tags, which get pushed before the
2671 file scope is created.) */
2672 if (B_IN_CURRENT_SCOPE (b)
2673 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2677 if (thislevel_only && !thislevel)
2680 if (TREE_CODE (b->decl) != code)
2682 /* Definition isn't the kind we were looking for. */
2683 pending_invalid_xref = name;
2684 pending_invalid_xref_location = input_location;
2686 /* If in the same binding level as a declaration as a tag
2687 of a different type, this must not be allowed to
2688 shadow that tag, so give the error immediately.
2689 (For example, "struct foo; union foo;" is invalid.) */
2691 pending_xref_error ();
2696 /* Print an error message now
2697 for a recent invalid struct, union or enum cross reference.
2698 We don't print them immediately because they are not invalid
2699 when used in the `struct foo;' construct for shadowing. */
2702 pending_xref_error (void)
2704 if (pending_invalid_xref != 0)
2705 error ("%H%qE defined as wrong kind of tag",
2706 &pending_invalid_xref_location, pending_invalid_xref);
2707 pending_invalid_xref = 0;
2711 /* Look up NAME in the current scope and its superiors
2712 in the namespace of variables, functions and typedefs.
2713 Return a ..._DECL node of some kind representing its definition,
2714 or return 0 if it is undefined. */
2717 lookup_name (tree name)
2719 struct c_binding *b = I_SYMBOL_BINDING (name);
2720 if (b && !b->invisible)
2725 /* Similar to `lookup_name' but look only at the indicated scope. */
2728 lookup_name_in_scope (tree name, struct c_scope *scope)
2730 struct c_binding *b;
2732 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2733 if (B_IN_SCOPE (b, scope))
2738 /* Create the predefined scalar types of C,
2739 and some nodes representing standard constants (0, 1, (void *) 0).
2740 Initialize the global scope.
2741 Make definitions for built-in primitive functions. */
2744 c_init_decl_processing (void)
2746 location_t save_loc = input_location;
2748 /* Initialize reserved words for parser. */
2751 current_function_decl = 0;
2753 gcc_obstack_init (&parser_obstack);
2755 /* Make the externals scope. */
2757 external_scope = current_scope;
2759 /* Declarations from c_common_nodes_and_builtins must not be associated
2760 with this input file, lest we get differences between using and not
2761 using preprocessed headers. */
2762 #ifdef USE_MAPPED_LOCATION
2763 input_location = BUILTINS_LOCATION;
2765 input_location.file = "<built-in>";
2766 input_location.line = 0;
2769 build_common_tree_nodes (flag_signed_char, false);
2771 c_common_nodes_and_builtins ();
2773 /* In C, comparisons and TRUTH_* expressions have type int. */
2774 truthvalue_type_node = integer_type_node;
2775 truthvalue_true_node = integer_one_node;
2776 truthvalue_false_node = integer_zero_node;
2778 /* Even in C99, which has a real boolean type. */
2779 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2780 boolean_type_node));
2782 input_location = save_loc;
2784 pedantic_lvalues = true;
2786 make_fname_decl = c_make_fname_decl;
2787 start_fname_decls ();
2790 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2791 decl, NAME is the initialization string and TYPE_DEP indicates whether
2792 NAME depended on the type of the function. As we don't yet implement
2793 delayed emission of static data, we mark the decl as emitted
2794 so it is not placed in the output. Anything using it must therefore pull
2795 out the STRING_CST initializer directly. FIXME. */
2798 c_make_fname_decl (tree id, int type_dep)
2800 const char *name = fname_as_string (type_dep);
2801 tree decl, type, init;
2802 size_t length = strlen (name);
2804 type = build_array_type (char_type_node,
2805 build_index_type (size_int (length)));
2806 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2808 decl = build_decl (VAR_DECL, id, type);
2810 TREE_STATIC (decl) = 1;
2811 TREE_READONLY (decl) = 1;
2812 DECL_ARTIFICIAL (decl) = 1;
2814 init = build_string (length + 1, name);
2815 free (CONST_CAST (char *, name));
2816 TREE_TYPE (init) = type;
2817 DECL_INITIAL (decl) = init;
2819 TREE_USED (decl) = 1;
2821 if (current_function_decl
2822 /* For invalid programs like this:
2825 const char* p = __FUNCTION__;
2827 the __FUNCTION__ is believed to appear in K&R style function
2828 parameter declarator. In that case we still don't have
2830 && (!errorcount || current_function_scope))
2832 DECL_CONTEXT (decl) = current_function_decl;
2833 bind (id, decl, current_function_scope,
2834 /*invisible=*/false, /*nested=*/false);
2837 finish_decl (decl, init, NULL_TREE);
2843 c_builtin_function (tree decl)
2845 tree type = TREE_TYPE (decl);
2846 tree id = DECL_NAME (decl);
2848 const char *name = IDENTIFIER_POINTER (id);
2849 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2850 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2852 /* Should never be called on a symbol with a preexisting meaning. */
2853 gcc_assert (!I_SYMBOL_BINDING (id));
2855 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2857 /* Builtins in the implementation namespace are made visible without
2858 needing to be explicitly declared. See push_file_scope. */
2859 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2861 TREE_CHAIN (decl) = visible_builtins;
2862 visible_builtins = decl;
2868 /* Called when a declaration is seen that contains no names to declare.
2869 If its type is a reference to a structure, union or enum inherited
2870 from a containing scope, shadow that tag name for the current scope
2871 with a forward reference.
2872 If its type defines a new named structure or union
2873 or defines an enum, it is valid but we need not do anything here.
2874 Otherwise, it is an error. */
2877 shadow_tag (const struct c_declspecs *declspecs)
2879 shadow_tag_warned (declspecs, 0);
2882 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2885 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2887 bool found_tag = false;
2889 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2891 tree value = declspecs->type;
2892 enum tree_code code = TREE_CODE (value);
2894 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2895 /* Used to test also that TYPE_SIZE (value) != 0.
2896 That caused warning for `struct foo;' at top level in the file. */
2898 tree name = TYPE_NAME (value);
2905 if (warned != 1 && code != ENUMERAL_TYPE)
2906 /* Empty unnamed enum OK */
2908 pedwarn ("unnamed struct/union that defines no instances");
2912 else if (!declspecs->tag_defined_p
2913 && declspecs->storage_class != csc_none)
2916 pedwarn ("empty declaration with storage class specifier "
2917 "does not redeclare tag");
2919 pending_xref_error ();
2921 else if (!declspecs->tag_defined_p
2922 && (declspecs->const_p
2923 || declspecs->volatile_p
2924 || declspecs->restrict_p))
2927 pedwarn ("empty declaration with type qualifier "
2928 "does not redeclare tag");
2930 pending_xref_error ();
2934 pending_invalid_xref = 0;
2935 t = lookup_tag (code, name, 1);
2939 t = make_node (code);
2946 if (warned != 1 && !in_system_header)
2948 pedwarn ("useless type name in empty declaration");
2953 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2955 pedwarn ("useless type name in empty declaration");
2959 pending_invalid_xref = 0;
2961 if (declspecs->inline_p)
2963 error ("%<inline%> in empty declaration");
2967 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2969 error ("%<auto%> in file-scope empty declaration");
2973 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2975 error ("%<register%> in file-scope empty declaration");
2979 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2981 warning (0, "useless storage class specifier in empty declaration");
2985 if (!warned && !in_system_header && declspecs->thread_p)
2987 warning (0, "useless %<__thread%> in empty declaration");
2991 if (!warned && !in_system_header && (declspecs->const_p
2992 || declspecs->volatile_p
2993 || declspecs->restrict_p))
2995 warning (0, "useless type qualifier in empty declaration");
3002 pedwarn ("empty declaration");
3007 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3008 bits. SPECS represents declaration specifiers that the grammar
3009 only permits to contain type qualifiers and attributes. */
3012 quals_from_declspecs (const struct c_declspecs *specs)
3014 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3015 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3016 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
3017 gcc_assert (!specs->type
3018 && !specs->decl_attr
3019 && specs->typespec_word == cts_none
3020 && specs->storage_class == csc_none
3021 && !specs->typedef_p
3022 && !specs->explicit_signed_p
3023 && !specs->deprecated_p
3025 && !specs->long_long_p
3028 && !specs->unsigned_p
3029 && !specs->complex_p
3031 && !specs->thread_p);
3035 /* Construct an array declarator. EXPR is the expression inside [],
3036 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3037 applied to the pointer to which a parameter array is converted).
3038 STATIC_P is true if "static" is inside the [], false otherwise.
3039 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3040 length which is nevertheless a complete type, false otherwise. The
3041 field for the contained declarator is left to be filled in by
3042 set_array_declarator_inner. */
3044 struct c_declarator *
3045 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3048 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3049 struct c_declarator);
3050 declarator->kind = cdk_array;
3051 declarator->declarator = 0;
3052 declarator->u.array.dimen = expr;
3055 declarator->u.array.attrs = quals->attrs;
3056 declarator->u.array.quals = quals_from_declspecs (quals);
3060 declarator->u.array.attrs = NULL_TREE;
3061 declarator->u.array.quals = 0;
3063 declarator->u.array.static_p = static_p;
3064 declarator->u.array.vla_unspec_p = vla_unspec_p;
3065 if (pedantic && !flag_isoc99)
3067 if (static_p || quals != NULL)
3068 pedwarn ("ISO C90 does not support %<static%> or type "
3069 "qualifiers in parameter array declarators");
3071 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3075 if (!current_scope->parm_flag)
3078 error ("%<[*]%> not allowed in other than function prototype scope");
3079 declarator->u.array.vla_unspec_p = false;
3082 current_scope->had_vla_unspec = true;
3087 /* Set the contained declarator of an array declarator. DECL is the
3088 declarator, as constructed by build_array_declarator; INNER is what
3089 appears on the left of the []. ABSTRACT_P is true if it is an
3090 abstract declarator, false otherwise; this is used to reject static
3091 and type qualifiers in abstract declarators, where they are not in
3092 the C99 grammar (subject to possible change in DR#289). */
3094 struct c_declarator *
3095 set_array_declarator_inner (struct c_declarator *decl,
3096 struct c_declarator *inner, bool abstract_p)
3098 decl->declarator = inner;
3099 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
3100 || decl->u.array.attrs != NULL_TREE
3101 || decl->u.array.static_p))
3102 error ("static or type qualifiers in abstract declarator");
3106 /* INIT is a constructor that forms DECL's initializer. If the final
3107 element initializes a flexible array field, add the size of that
3108 initializer to DECL's size. */
3111 add_flexible_array_elts_to_size (tree decl, tree init)
3115 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3118 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3119 type = TREE_TYPE (elt);
3120 if (TREE_CODE (type) == ARRAY_TYPE
3121 && TYPE_SIZE (type) == NULL_TREE
3122 && TYPE_DOMAIN (type) != NULL_TREE
3123 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3125 complete_array_type (&type, elt, false);
3127 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3128 DECL_SIZE_UNIT (decl)
3129 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3133 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3136 groktypename (struct c_type_name *type_name)
3139 tree attrs = type_name->specs->attrs;
3141 type_name->specs->attrs = NULL_TREE;
3143 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3144 false, NULL, DEPRECATED_NORMAL);
3146 /* Apply attributes. */
3147 decl_attributes (&type, attrs, 0);
3152 /* Decode a declarator in an ordinary declaration or data definition.
3153 This is called as soon as the type information and variable name
3154 have been parsed, before parsing the initializer if any.
3155 Here we create the ..._DECL node, fill in its type,
3156 and put it on the list of decls for the current context.
3157 The ..._DECL node is returned as the value.
3159 Exception: for arrays where the length is not specified,
3160 the type is left null, to be filled in by `finish_decl'.
3162 Function definitions do not come here; they go to start_function
3163 instead. However, external and forward declarations of functions
3164 do go through here. Structure field declarations are done by
3165 grokfield and not through here. */
3168 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3169 bool initialized, tree attributes)
3173 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
3175 /* An object declared as __attribute__((deprecated)) suppresses
3176 warnings of uses of other deprecated items. */
3177 if (lookup_attribute ("deprecated", attributes))
3178 deprecated_state = DEPRECATED_SUPPRESS;
3180 decl = grokdeclarator (declarator, declspecs,
3181 NORMAL, initialized, NULL,
3186 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3187 && MAIN_NAME_P (DECL_NAME (decl)))
3188 warning (OPT_Wmain, "%q+D is usually a function", decl);
3191 /* Is it valid for this decl to have an initializer at all?
3192 If not, set INITIALIZED to zero, which will indirectly
3193 tell 'finish_decl' to ignore the initializer once it is parsed. */
3194 switch (TREE_CODE (decl))
3197 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3202 error ("function %qD is initialized like a variable", decl);
3207 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3208 error ("parameter %qD is initialized", decl);
3213 /* Don't allow initializations for incomplete types except for
3214 arrays which might be completed by the initialization. */
3216 /* This can happen if the array size is an undefined macro.
3217 We already gave a warning, so we don't need another one. */
3218 if (TREE_TYPE (decl) == error_mark_node)
3220 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3222 /* A complete type is ok if size is fixed. */
3224 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3225 || C_DECL_VARIABLE_SIZE (decl))
3227 error ("variable-sized object may not be initialized");
3231 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3233 error ("variable %qD has initializer but incomplete type", decl);
3236 else if (C_DECL_VARIABLE_SIZE (decl))
3238 /* Although C99 is unclear about whether incomplete arrays
3239 of VLAs themselves count as VLAs, it does not make
3240 sense to permit them to be initialized given that
3241 ordinary VLAs may not be initialized. */
3242 error ("variable-sized object may not be initialized");
3249 if (current_scope == file_scope)
3250 TREE_STATIC (decl) = 1;
3252 /* Tell 'pushdecl' this is an initialized decl
3253 even though we don't yet have the initializer expression.
3254 Also tell 'finish_decl' it may store the real initializer. */
3255 DECL_INITIAL (decl) = error_mark_node;
3258 /* If this is a function declaration, write a record describing it to the
3259 prototypes file (if requested). */
3261 if (TREE_CODE (decl) == FUNCTION_DECL)
3262 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3264 /* ANSI specifies that a tentative definition which is not merged with
3265 a non-tentative definition behaves exactly like a definition with an
3266 initializer equal to zero. (Section 3.7.2)
3268 -fno-common gives strict ANSI behavior, though this tends to break
3269 a large body of code that grew up without this rule.
3271 Thread-local variables are never common, since there's no entrenched
3272 body of code to break, and it allows more efficient variable references
3273 in the presence of dynamic linking. */
3275 if (TREE_CODE (decl) == VAR_DECL
3277 && TREE_PUBLIC (decl)
3278 && !DECL_THREAD_LOCAL_P (decl)
3280 DECL_COMMON (decl) = 1;
3282 /* Set attributes here so if duplicate decl, will have proper attributes. */
3283 decl_attributes (&decl, attributes, 0);
3285 /* Handle gnu_inline attribute. */
3286 if (declspecs->inline_p
3287 && !flag_gnu89_inline
3288 && TREE_CODE (decl) == FUNCTION_DECL
3289 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl)))
3291 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
3293 else if (declspecs->storage_class != csc_static)
3294 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
3297 if (TREE_CODE (decl) == FUNCTION_DECL
3298 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3300 struct c_declarator *ce = declarator;
3302 if (ce->kind == cdk_pointer)
3303 ce = declarator->declarator;
3304 if (ce->kind == cdk_function)
3306 tree args = ce->u.arg_info->parms;
3307 for (; args; args = TREE_CHAIN (args))
3309 tree type = TREE_TYPE (args);
3310 if (type && INTEGRAL_TYPE_P (type)
3311 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3312 DECL_ARG_TYPE (args) = integer_type_node;
3317 if (TREE_CODE (decl) == FUNCTION_DECL
3318 && DECL_DECLARED_INLINE_P (decl)
3319 && DECL_UNINLINABLE (decl)
3320 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3321 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3324 /* C99 6.7.4p3: An inline definition of a function with external
3325 linkage shall not contain a definition of a modifiable object
3326 with static storage duration... */
3327 if (TREE_CODE (decl) == VAR_DECL
3328 && current_scope != file_scope
3329 && TREE_STATIC (decl)
3330 && DECL_DECLARED_INLINE_P (current_function_decl)
3331 && DECL_EXTERNAL (current_function_decl))
3332 pedwarn ("%q+D is static but declared in inline function %qD "
3333 "which is not static", decl, current_function_decl);
3335 /* Add this decl to the current scope.
3336 TEM may equal DECL or it may be a previous decl of the same name. */
3337 tem = pushdecl (decl);
3339 if (initialized && DECL_EXTERNAL (tem))
3341 DECL_EXTERNAL (tem) = 0;
3342 TREE_STATIC (tem) = 1;
3348 /* Initialize EH if not initialized yet and exceptions are enabled. */
3351 c_maybe_initialize_eh (void)
3353 if (!flag_exceptions || c_eh_initialized_p)
3356 c_eh_initialized_p = true;
3357 eh_personality_libfunc
3358 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3359 ? "__gcc_personality_sj0"
3360 : "__gcc_personality_v0");
3361 default_init_unwind_resume_libfunc ();
3362 using_eh_for_cleanups ();
3365 /* Finish processing of a declaration;
3366 install its initial value.
3367 If the length of an array type is not known before,
3368 it must be determined now, from the initial value, or it is an error. */
3371 finish_decl (tree decl, tree init, tree asmspec_tree)
3374 int was_incomplete = (DECL_SIZE (decl) == 0);
3375 const char *asmspec = 0;
3377 /* If a name was specified, get the string. */
3378 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3379 && DECL_FILE_SCOPE_P (decl))
3380 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3382 asmspec = TREE_STRING_POINTER (asmspec_tree);
3384 /* If `start_decl' didn't like having an initialization, ignore it now. */
3385 if (init != 0 && DECL_INITIAL (decl) == 0)
3388 /* Don't crash if parm is initialized. */
3389 if (TREE_CODE (decl) == PARM_DECL)
3393 store_init_value (decl, init);
3395 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3396 || TREE_CODE (decl) == FUNCTION_DECL
3397 || TREE_CODE (decl) == FIELD_DECL))
3398 objc_check_decl (decl);
3400 type = TREE_TYPE (decl);
3402 /* Deduce size of array from initialization, if not already known. */
3403 if (TREE_CODE (type) == ARRAY_TYPE
3404 && TYPE_DOMAIN (type) == 0
3405 && TREE_CODE (decl) != TYPE_DECL)
3408 = (TREE_STATIC (decl)
3409 /* Even if pedantic, an external linkage array
3410 may have incomplete type at first. */
3411 ? pedantic && !TREE_PUBLIC (decl)
3412 : !DECL_EXTERNAL (decl));
3414 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3417 /* Get the completed type made by complete_array_type. */
3418 type = TREE_TYPE (decl);
3423 error ("initializer fails to determine size of %q+D", decl);
3428 error ("array size missing in %q+D", decl);
3429 /* If a `static' var's size isn't known,
3430 make it extern as well as static, so it does not get
3432 If it is not `static', then do not mark extern;
3433 finish_incomplete_decl will give it a default size
3434 and it will get allocated. */
3435 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3436 DECL_EXTERNAL (decl) = 1;
3440 error ("zero or negative size array %q+D", decl);
3444 /* For global variables, update the copy of the type that
3445 exists in the binding. */
3446 if (TREE_PUBLIC (decl))
3448 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3449 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3450 b_ext = b_ext->shadowed;
3454 b_ext->type = composite_type (b_ext->type, type);
3465 if (DECL_INITIAL (decl))
3466 TREE_TYPE (DECL_INITIAL (decl)) = type;
3468 layout_decl (decl, 0);
3471 if (TREE_CODE (decl) == VAR_DECL)
3473 if (init && TREE_CODE (init) == CONSTRUCTOR)
3474 add_flexible_array_elts_to_size (decl, init);
3476 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3477 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3478 layout_decl (decl, 0);
3480 if (DECL_SIZE (decl) == 0
3481 /* Don't give an error if we already gave one earlier. */
3482 && TREE_TYPE (decl) != error_mark_node
3483 && (TREE_STATIC (decl)
3484 /* A static variable with an incomplete type
3485 is an error if it is initialized.
3486 Also if it is not file scope.
3487 Otherwise, let it through, but if it is not `extern'
3488 then it may cause an error message later. */
3489 ? (DECL_INITIAL (decl) != 0
3490 || !DECL_FILE_SCOPE_P (decl))
3491 /* An automatic variable with an incomplete type
3493 : !DECL_EXTERNAL (decl)))
3495 error ("storage size of %q+D isn%'t known", decl);
3496 TREE_TYPE (decl) = error_mark_node;
3499 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3500 && DECL_SIZE (decl) != 0)
3502 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3503 constant_expression_warning (DECL_SIZE (decl));
3505 error ("storage size of %q+D isn%'t constant", decl);
3508 if (TREE_USED (type))
3509 TREE_USED (decl) = 1;
3512 /* If this is a function and an assembler name is specified, reset DECL_RTL
3513 so we can give it its new name. Also, update built_in_decls if it
3514 was a normal built-in. */
3515 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3517 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3518 set_builtin_user_assembler_name (decl, asmspec);
3519 set_user_assembler_name (decl, asmspec);
3522 /* If #pragma weak was used, mark the decl weak now. */
3523 maybe_apply_pragma_weak (decl);
3525 /* Output the assembler code and/or RTL code for variables and functions,
3526 unless the type is an undefined structure or union.
3527 If not, it will get done when the type is completed. */
3529 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3531 /* Determine the ELF visibility. */
3532 if (TREE_PUBLIC (decl))
3533 c_determine_visibility (decl);
3535 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3536 if (c_dialect_objc ())
3537 objc_check_decl (decl);
3541 /* If this is not a static variable, issue a warning.
3542 It doesn't make any sense to give an ASMSPEC for an
3543 ordinary, non-register local variable. Historically,
3544 GCC has accepted -- but ignored -- the ASMSPEC in
3546 if (!DECL_FILE_SCOPE_P (decl)
3547 && TREE_CODE (decl) == VAR_DECL
3548 && !C_DECL_REGISTER (decl)
3549 && !TREE_STATIC (decl))
3550 warning (0, "ignoring asm-specifier for non-static local "
3551 "variable %q+D", decl);
3553 set_user_assembler_name (decl, asmspec);
3556 if (DECL_FILE_SCOPE_P (decl))
3558 if (DECL_INITIAL (decl) == NULL_TREE
3559 || DECL_INITIAL (decl) == error_mark_node)
3560 /* Don't output anything
3561 when a tentative file-scope definition is seen.
3562 But at end of compilation, do output code for them. */
3563 DECL_DEFER_OUTPUT (decl) = 1;
3564 rest_of_decl_compilation (decl, true, 0);
3568 /* In conjunction with an ASMSPEC, the `register'
3569 keyword indicates that we should place the variable
3570 in a particular register. */
3571 if (asmspec && C_DECL_REGISTER (decl))
3573 DECL_HARD_REGISTER (decl) = 1;
3574 /* This cannot be done for a structure with volatile
3575 fields, on which DECL_REGISTER will have been
3577 if (!DECL_REGISTER (decl))
3578 error ("cannot put object with volatile field into register");
3581 if (TREE_CODE (decl) != FUNCTION_DECL)
3583 /* If we're building a variable sized type, and we might be
3584 reachable other than via the top of the current binding
3585 level, then create a new BIND_EXPR so that we deallocate
3586 the object at the right time. */
3587 /* Note that DECL_SIZE can be null due to errors. */
3588 if (DECL_SIZE (decl)
3589 && !TREE_CONSTANT (DECL_SIZE (decl))
3590 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3593 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3594 TREE_SIDE_EFFECTS (bind) = 1;
3596 BIND_EXPR_BODY (bind) = push_stmt_list ();
3598 add_stmt (build_stmt (DECL_EXPR, decl));
3603 if (!DECL_FILE_SCOPE_P (decl))
3605 /* Recompute the RTL of a local array now
3606 if it used to be an incomplete type. */
3608 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3610 /* If we used it already as memory, it must stay in memory. */
3611 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3612 /* If it's still incomplete now, no init will save it. */
3613 if (DECL_SIZE (decl) == 0)
3614 DECL_INITIAL (decl) = 0;
3619 /* If this was marked 'used', be sure it will be output. */
3620 if (!flag_unit_at_a_time && lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3621 mark_decl_referenced (decl);
3623 if (TREE_CODE (decl) == TYPE_DECL)
3625 if (!DECL_FILE_SCOPE_P (decl)
3626 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3627 add_stmt (build_stmt (DECL_EXPR, decl));
3629 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3632 /* At the end of a declaration, throw away any variable type sizes
3633 of types defined inside that declaration. There is no use
3634 computing them in the following function definition. */
3635 if (current_scope == file_scope)
3636 get_pending_sizes ();
3638 /* Install a cleanup (aka destructor) if one was given. */
3639 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3641 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3644 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3645 tree cleanup_decl = lookup_name (cleanup_id);
3648 /* Build "cleanup(&decl)" for the destructor. */
3649 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3650 cleanup = build_tree_list (NULL_TREE, cleanup);
3651 cleanup = build_function_call (cleanup_decl, cleanup);
3653 /* Don't warn about decl unused; the cleanup uses it. */
3654 TREE_USED (decl) = 1;
3655 TREE_USED (cleanup_decl) = 1;
3657 /* Initialize EH, if we've been told to do so. */
3658 c_maybe_initialize_eh ();
3660 push_cleanup (decl, cleanup, false);
3665 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3668 grokparm (const struct c_parm *parm)
3670 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3671 NULL, DEPRECATED_NORMAL);
3673 decl_attributes (&decl, parm->attrs, 0);
3678 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3679 and push that on the current scope. */
3682 push_parm_decl (const struct c_parm *parm)
3686 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
3688 decl_attributes (&decl, parm->attrs, 0);
3690 decl = pushdecl (decl);
3692 finish_decl (decl, NULL_TREE, NULL_TREE);
3695 /* Mark all the parameter declarations to date as forward decls.
3696 Also diagnose use of this extension. */
3699 mark_forward_parm_decls (void)
3701 struct c_binding *b;
3703 if (pedantic && !current_scope->warned_forward_parm_decls)
3705 pedwarn ("ISO C forbids forward parameter declarations");
3706 current_scope->warned_forward_parm_decls = true;
3709 for (b = current_scope->bindings; b; b = b->prev)
3710 if (TREE_CODE (b->decl) == PARM_DECL)
3711 TREE_ASM_WRITTEN (b->decl) = 1;
3714 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3715 literal, which may be an incomplete array type completed by the
3716 initializer; INIT is a CONSTRUCTOR that initializes the compound
3720 build_compound_literal (tree type, tree init)
3722 /* We do not use start_decl here because we have a type, not a declarator;
3723 and do not use finish_decl because the decl should be stored inside
3724 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3729 if (type == error_mark_node)
3730 return error_mark_node;
3732 decl = build_decl (VAR_DECL, NULL_TREE, type);
3733 DECL_EXTERNAL (decl) = 0;
3734 TREE_PUBLIC (decl) = 0;
3735 TREE_STATIC (decl) = (current_scope == file_scope);
3736 DECL_CONTEXT (decl) = current_function_decl;
3737 TREE_USED (decl) = 1;
3738 TREE_TYPE (decl) = type;
3739 TREE_READONLY (decl) = TYPE_READONLY (type);
3740 store_init_value (decl, init);
3742 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3744 int failure = complete_array_type (&TREE_TYPE (decl),
3745 DECL_INITIAL (decl), true);
3746 gcc_assert (!failure);
3748 type = TREE_TYPE (decl);
3749 TREE_TYPE (DECL_INITIAL (decl)) = type;
3752 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3753 return error_mark_node;
3755 stmt = build_stmt (DECL_EXPR, decl);
3756 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3757 TREE_SIDE_EFFECTS (complit) = 1;
3759 layout_decl (decl, 0);
3761 if (TREE_STATIC (decl))
3763 /* This decl needs a name for the assembler output. */
3764 set_compound_literal_name (decl);
3765 DECL_DEFER_OUTPUT (decl) = 1;
3766 DECL_COMDAT (decl) = 1;
3767 DECL_ARTIFICIAL (decl) = 1;
3768 DECL_IGNORED_P (decl) = 1;
3770 rest_of_decl_compilation (decl, 1, 0);
3776 /* Determine whether TYPE is a structure with a flexible array member,
3777 or a union containing such a structure (possibly recursively). */
3780 flexible_array_type_p (tree type)
3783 switch (TREE_CODE (type))
3786 x = TYPE_FIELDS (type);
3789 while (TREE_CHAIN (x) != NULL_TREE)
3791 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3792 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3793 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3794 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3798 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3800 if (flexible_array_type_p (TREE_TYPE (x)))
3809 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3810 replacing with appropriate values if they are invalid. */
3812 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3815 unsigned int max_width;
3816 unsigned HOST_WIDE_INT w;
3817 const char *name = orig_name ? orig_name: _("<anonymous>");
3819 /* Detect and ignore out of range field width and process valid
3821 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3822 || TREE_CODE (*width) != INTEGER_CST)
3824 error ("bit-field %qs width not an integer constant", name);
3825 *width = integer_one_node;
3829 constant_expression_warning (*width);
3830 if (tree_int_cst_sgn (*width) < 0)
3832 error ("negative width in bit-field %qs", name);
3833 *width = integer_one_node;
3835 else if (integer_zerop (*width) && orig_name)
3837 error ("zero width for bit-field %qs", name);
3838 *width = integer_one_node;
3842 /* Detect invalid bit-field type. */
3843 if (TREE_CODE (*type) != INTEGER_TYPE
3844 && TREE_CODE (*type) != BOOLEAN_TYPE
3845 && TREE_CODE (*type) != ENUMERAL_TYPE)
3847 error ("bit-field %qs has invalid type", name);
3848 *type = unsigned_type_node;
3851 type_mv = TYPE_MAIN_VARIANT (*type);
3853 && !in_system_header
3854 && type_mv != integer_type_node
3855 && type_mv != unsigned_type_node
3856 && type_mv != boolean_type_node)
3857 pedwarn ("type of bit-field %qs is a GCC extension", name);
3859 if (type_mv == boolean_type_node)
3860 max_width = CHAR_TYPE_SIZE;
3862 max_width = TYPE_PRECISION (*type);
3864 if (0 < compare_tree_int (*width, max_width))
3866 error ("width of %qs exceeds its type", name);
3868 *width = build_int_cst (NULL_TREE, w);
3871 w = tree_low_cst (*width, 1);
3873 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3875 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3877 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3878 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3879 warning (0, "%qs is narrower than values of its type", name);
3885 /* Print warning about variable length array if necessary. */
3888 warn_variable_length_array (const char *name, tree size)
3890 int ped = !flag_isoc99 && pedantic && warn_vla != 0;
3891 int const_size = TREE_CONSTANT (size);
3898 pedwarn ("ISO C90 forbids array %qs whose size "
3899 "can%'t be evaluated",
3902 pedwarn ("ISO C90 forbids array whose size "
3903 "can%'t be evaluated");
3908 pedwarn ("ISO C90 forbids variable length array %qs",
3911 pedwarn ("ISO C90 forbids variable length array");
3914 else if (warn_vla > 0)
3920 "the size of array %qs can"
3921 "%'t be evaluated", name);
3924 "the size of array can %'t be evaluated");
3930 "variable length array %qs is used",
3934 "variable length array is used");
3939 /* Given declspecs and a declarator,
3940 determine the name and type of the object declared
3941 and construct a ..._DECL node for it.
3942 (In one case we can return a ..._TYPE node instead.
3943 For invalid input we sometimes return 0.)
3945 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3947 DECL_CONTEXT says which syntactic context this declaration is in:
3948 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3949 FUNCDEF for a function definition. Like NORMAL but a few different
3950 error messages in each case. Return value may be zero meaning
3951 this definition is too screwy to try to parse.
3952 PARM for a parameter declaration (either within a function prototype
3953 or before a function body). Make a PARM_DECL, or return void_type_node.
3954 TYPENAME if for a typename (in a cast or sizeof).
3955 Don't make a DECL node; just return the ..._TYPE node.
3956 FIELD for a struct or union field; make a FIELD_DECL.
3957 INITIALIZED is true if the decl has an initializer.
3958 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3959 representing the width of the bit-field.
3960 DEPRECATED_STATE is a deprecated_states value indicating whether
3961 deprecation warnings should be suppressed.
3963 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3964 It may also be so in the PARM case, for a prototype where the
3965 argument type is specified but not the name.
3967 This function is where the complicated C meanings of `static'
3968 and `extern' are interpreted. */
3971 grokdeclarator (const struct c_declarator *declarator,
3972 struct c_declspecs *declspecs,
3973 enum decl_context decl_context, bool initialized, tree *width,
3974 enum deprecated_states deprecated_state)
3976 tree type = declspecs->type;
3977 bool threadp = declspecs->thread_p;
3978 enum c_storage_class storage_class = declspecs->storage_class;
3982 int type_quals = TYPE_UNQUALIFIED;
3983 const char *name, *orig_name;
3984 tree typedef_type = 0;
3985 bool funcdef_flag = false;
3986 bool funcdef_syntax = false;
3987 int size_varies = 0;
3988 tree decl_attr = declspecs->decl_attr;
3989 int array_ptr_quals = TYPE_UNQUALIFIED;
3990 tree array_ptr_attrs = NULL_TREE;
3991 int array_parm_static = 0;
3992 bool array_parm_vla_unspec_p = false;
3993 tree returned_attrs = NULL_TREE;
3994 bool bitfield = width != NULL;
3996 struct c_arg_info *arg_info = 0;
3998 if (decl_context == FUNCDEF)
3999 funcdef_flag = true, decl_context = NORMAL;
4001 /* Look inside a declarator for the name being declared
4002 and get it as a string, for an error message. */
4004 const struct c_declarator *decl = declarator;
4013 funcdef_syntax = (decl->kind == cdk_function);
4014 decl = decl->declarator;
4018 decl = decl->declarator;
4023 name = IDENTIFIER_POINTER (decl->u.id);
4035 /* A function definition's declarator must have the form of
4036 a function declarator. */
4038 if (funcdef_flag && !funcdef_syntax)
4041 /* If this looks like a function definition, make it one,
4042 even if it occurs where parms are expected.
4043 Then store_parm_decls will reject it and not use it as a parm. */
4044 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4045 decl_context = PARM;
4047 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4048 warn_deprecated_use (declspecs->type);
4050 if ((decl_context == NORMAL || decl_context == FIELD)
4051 && current_scope == file_scope
4052 && variably_modified_type_p (type, NULL_TREE))
4054 error ("variably modified %qs at file scope", name);
4055 type = integer_type_node;
4058 typedef_type = type;
4059 size_varies = C_TYPE_VARIABLE_SIZE (type);
4061 /* Diagnose defaulting to "int". */
4063 if (declspecs->default_int_p && !in_system_header)
4065 /* Issue a warning if this is an ISO C 99 program or if
4066 -Wreturn-type and this is a function, or if -Wimplicit;
4067 prefer the former warning since it is more explicit. */
4068 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4070 warn_about_return_type = 1;
4071 else if (warn_implicit_int || flag_isoc99)
4072 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
4075 /* Adjust the type if a bit-field is being declared,
4076 -funsigned-bitfields applied and the type is not explicitly
4078 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4079 && TREE_CODE (type) == INTEGER_TYPE)
4080 type = c_common_unsigned_type (type);
4082 /* Figure out the type qualifiers for the declaration. There are
4083 two ways a declaration can become qualified. One is something
4084 like `const int i' where the `const' is explicit. Another is
4085 something like `typedef const int CI; CI i' where the type of the
4086 declaration contains the `const'. A third possibility is that
4087 there is a type qualifier on the element type of a typedefed
4088 array type, in which case we should extract that qualifier so
4089 that c_apply_type_quals_to_decls receives the full list of
4090 qualifiers to work with (C90 is not entirely clear about whether
4091 duplicate qualifiers should be diagnosed in this case, but it
4092 seems most appropriate to do so). */
4093 element_type = strip_array_types (type);
4094 constp = declspecs->const_p + TYPE_READONLY (element_type);
4095 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4096 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4097 if (pedantic && !flag_isoc99)
4100 pedwarn ("duplicate %<const%>");
4102 pedwarn ("duplicate %<restrict%>");
4104 pedwarn ("duplicate %<volatile%>");
4106 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4107 type = TYPE_MAIN_VARIANT (type);
4108 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4109 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4110 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4112 /* Warn about storage classes that are invalid for certain
4113 kinds of declarations (parameters, typenames, etc.). */
4117 || storage_class == csc_auto
4118 || storage_class == csc_register
4119 || storage_class == csc_typedef))
4121 if (storage_class == csc_auto
4122 && (pedantic || current_scope == file_scope))
4123 pedwarn ("function definition declared %<auto%>");
4124 if (storage_class == csc_register)
4125 error ("function definition declared %<register%>");
4126 if (storage_class == csc_typedef)
4127 error ("function definition declared %<typedef%>");
4129 error ("function definition declared %<__thread%>");
4131 if (storage_class == csc_auto
4132 || storage_class == csc_register
4133 || storage_class == csc_typedef)
4134 storage_class = csc_none;
4136 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4138 if (decl_context == PARM && storage_class == csc_register)
4142 switch (decl_context)
4145 error ("storage class specified for structure field %qs",
4149 error ("storage class specified for parameter %qs", name);
4152 error ("storage class specified for typename");
4155 storage_class = csc_none;
4159 else if (storage_class == csc_extern
4163 /* 'extern' with initialization is invalid if not at file scope. */
4164 if (current_scope == file_scope)
4166 /* It is fine to have 'extern const' when compiling at C
4167 and C++ intersection. */
4168 if (!(warn_cxx_compat && constp))
4169 warning (0, "%qs initialized and declared %<extern%>", name);
4172 error ("%qs has both %<extern%> and initializer", name);
4174 else if (current_scope == file_scope)
4176 if (storage_class == csc_auto)
4177 error ("file-scope declaration of %qs specifies %<auto%>", name);
4178 if (pedantic && storage_class == csc_register)
4179 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
4183 if (storage_class == csc_extern && funcdef_flag)
4184 error ("nested function %qs declared %<extern%>", name);
4185 else if (threadp && storage_class == csc_none)
4187 error ("function-scope %qs implicitly auto and declared "
4194 /* Now figure out the structure of the declarator proper.
4195 Descend through it, creating more complex types, until we reach
4196 the declared identifier (or NULL_TREE, in an absolute declarator).
4197 At each stage we maintain an unqualified version of the type
4198 together with any qualifiers that should be applied to it with
4199 c_build_qualified_type; this way, array types including
4200 multidimensional array types are first built up in unqualified
4201 form and then the qualified form is created with
4202 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4204 while (declarator && declarator->kind != cdk_id)
4206 if (type == error_mark_node)
4208 declarator = declarator->declarator;
4212 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4213 a cdk_pointer (for *...),
4214 a cdk_function (for ...(...)),
4215 a cdk_attrs (for nested attributes),
4216 or a cdk_id (for the name being declared
4217 or the place in an absolute declarator
4218 where the name was omitted).
4219 For the last case, we have just exited the loop.
4221 At this point, TYPE is the type of elements of an array,
4222 or for a function to return, or for a pointer to point to.
4223 After this sequence of ifs, TYPE is the type of the
4224 array or function or pointer, and DECLARATOR has had its
4225 outermost layer removed. */
4227 if (array_ptr_quals != TYPE_UNQUALIFIED
4228 || array_ptr_attrs != NULL_TREE
4229 || array_parm_static)
4231 /* Only the innermost declarator (making a parameter be of
4232 array type which is converted to pointer type)
4233 may have static or type qualifiers. */
4234 error ("static or type qualifiers in non-parameter array declarator");
4235 array_ptr_quals = TYPE_UNQUALIFIED;
4236 array_ptr_attrs = NULL_TREE;
4237 array_parm_static = 0;
4240 switch (declarator->kind)
4244 /* A declarator with embedded attributes. */
4245 tree attrs = declarator->u.attrs;
4246 const struct c_declarator *inner_decl;
4248 declarator = declarator->declarator;
4249 inner_decl = declarator;
4250 while (inner_decl->kind == cdk_attrs)
4251 inner_decl = inner_decl->declarator;
4252 if (inner_decl->kind == cdk_id)
4253 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4254 else if (inner_decl->kind == cdk_function)
4255 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4256 else if (inner_decl->kind == cdk_array)
4257 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4258 returned_attrs = decl_attributes (&type,
4259 chainon (returned_attrs, attrs),
4265 tree itype = NULL_TREE;
4266 tree size = declarator->u.array.dimen;
4267 /* The index is a signed object `sizetype' bits wide. */
4268 tree index_type = c_common_signed_type (sizetype);
4270 array_ptr_quals = declarator->u.array.quals;
4271 array_ptr_attrs = declarator->u.array.attrs;
4272 array_parm_static = declarator->u.array.static_p;
4273 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
4275 declarator = declarator->declarator;
4277 /* Check for some types that there cannot be arrays of. */
4279 if (VOID_TYPE_P (type))
4281 error ("declaration of %qs as array of voids", name);
4282 type = error_mark_node;
4285 if (TREE_CODE (type) == FUNCTION_TYPE)
4287 error ("declaration of %qs as array of functions", name);
4288 type = error_mark_node;
4291 if (pedantic && !in_system_header && flexible_array_type_p (type))
4292 pedwarn ("invalid use of structure with flexible array member");
4294 if (size == error_mark_node)
4295 type = error_mark_node;
4297 if (type == error_mark_node)
4300 /* If size was specified, set ITYPE to a range-type for
4301 that size. Otherwise, ITYPE remains null. finish_decl
4302 may figure it out from an initial value. */
4306 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4308 STRIP_TYPE_NOPS (size);
4310 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4312 error ("size of array %qs has non-integer type", name);
4313 size = integer_one_node;
4316 if (pedantic && integer_zerop (size))
4317 pedwarn ("ISO C forbids zero-size array %qs", name);
4319 if (TREE_CODE (size) == INTEGER_CST)
4321 constant_expression_warning (size);
4322 if (tree_int_cst_sgn (size) < 0)
4324 error ("size of array %qs is negative", name);
4325 size = integer_one_node;
4328 else if ((decl_context == NORMAL || decl_context == FIELD)
4329 && current_scope == file_scope)
4331 error ("variably modified %qs at file scope", name);
4332 size = integer_one_node;
4336 /* Make sure the array size remains visibly
4337 nonconstant even if it is (eg) a const variable
4338 with known value. */
4340 warn_variable_length_array (orig_name, size);
4343 if (integer_zerop (size))
4345 /* A zero-length array cannot be represented with
4346 an unsigned index type, which is what we'll
4347 get with build_index_type. Create an
4348 open-ended range instead. */
4349 itype = build_range_type (sizetype, size, NULL_TREE);
4353 /* Arrange for the SAVE_EXPR on the inside of the
4354 MINUS_EXPR, which allows the -1 to get folded
4355 with the +1 that happens when building TYPE_SIZE. */
4357 size = variable_size (size);
4359 /* Compute the maximum valid index, that is, size
4360 - 1. Do the calculation in index_type, so that
4361 if it is a variable the computations will be
4362 done in the proper mode. */
4363 itype = fold_build2 (MINUS_EXPR, index_type,
4364 convert (index_type, size),
4365 convert (index_type,
4368 /* If that overflowed, the array is too big. ???
4369 While a size of INT_MAX+1 technically shouldn't
4370 cause an overflow (because we subtract 1), the
4371 overflow is recorded during the conversion to
4372 index_type, before the subtraction. Handling
4373 this case seems like an unnecessary
4375 if (TREE_CODE (itype) == INTEGER_CST
4376 && TREE_OVERFLOW (itype))
4378 error ("size of array %qs is too large", name);
4379 type = error_mark_node;
4383 itype = build_index_type (itype);
4386 else if (decl_context == FIELD)
4388 if (pedantic && !flag_isoc99 && !in_system_header)
4389 pedwarn ("ISO C90 does not support flexible array members");
4391 /* ISO C99 Flexible array members are effectively
4392 identical to GCC's zero-length array extension. */
4393 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4395 else if (decl_context == PARM)
4397 if (array_parm_vla_unspec_p)
4402 error ("%<[*]%> not allowed in other than a declaration");
4405 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4409 else if (decl_context == TYPENAME)
4411 if (array_parm_vla_unspec_p)
4413 /* The error is printed elsewhere. We use this to
4414 avoid messing up with incomplete array types of
4415 the same type, that would otherwise be modified
4417 itype = build_range_type (sizetype, size_zero_node,
4422 /* Complain about arrays of incomplete types. */
4423 if (!COMPLETE_TYPE_P (type))
4425 error ("array type has incomplete element type");
4426 type = error_mark_node;
4429 /* When itype is NULL, a shared incomplete array type is
4430 returned for all array of a given type. Elsewhere we
4431 make sure we don't complete that type before copying
4432 it, but here we want to make sure we don't ever
4433 modify the shared type, so we gcc_assert (itype)
4435 type = build_array_type (type, itype);
4437 if (type != error_mark_node)
4441 /* It is ok to modify type here even if itype is
4442 NULL: if size_varies, we're in a
4443 multi-dimensional array and the inner type has
4444 variable size, so the enclosing shared array type
4446 if (size && TREE_CODE (size) == INTEGER_CST)
4448 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
4449 C_TYPE_VARIABLE_SIZE (type) = 1;
4452 /* The GCC extension for zero-length arrays differs from
4453 ISO flexible array members in that sizeof yields
4455 if (size && integer_zerop (size))
4458 TYPE_SIZE (type) = bitsize_zero_node;
4459 TYPE_SIZE_UNIT (type) = size_zero_node;
4461 if (array_parm_vla_unspec_p)
4464 /* The type is complete. C99 6.7.5.2p4 */
4465 TYPE_SIZE (type) = bitsize_zero_node;
4466 TYPE_SIZE_UNIT (type) = size_zero_node;
4470 if (decl_context != PARM
4471 && (array_ptr_quals != TYPE_UNQUALIFIED
4472 || array_ptr_attrs != NULL_TREE
4473 || array_parm_static))
4475 error ("static or type qualifiers in non-parameter array declarator");
4476 array_ptr_quals = TYPE_UNQUALIFIED;
4477 array_ptr_attrs = NULL_TREE;
4478 array_parm_static = 0;
4484 /* Say it's a definition only for the declarator closest
4485 to the identifier, apart possibly from some
4487 bool really_funcdef = false;
4491 const struct c_declarator *t = declarator->declarator;
4492 while (t->kind == cdk_attrs)
4494 really_funcdef = (t->kind == cdk_id);
4497 /* Declaring a function type. Make sure we have a valid
4498 type for the function to return. */
4499 if (type == error_mark_node)
4504 /* Warn about some types functions can't return. */
4505 if (TREE_CODE (type) == FUNCTION_TYPE)
4507 error ("%qs declared as function returning a function", name);
4508 type = integer_type_node;
4510 if (TREE_CODE (type) == ARRAY_TYPE)
4512 error ("%qs declared as function returning an array", name);
4513 type = integer_type_node;
4516 /* Construct the function type and go to the next
4517 inner layer of declarator. */
4518 arg_info = declarator->u.arg_info;
4519 arg_types = grokparms (arg_info, really_funcdef);
4521 put_pending_sizes (arg_info->pending_sizes);
4523 /* Type qualifiers before the return type of the function
4524 qualify the return type, not the function type. */
4527 /* Type qualifiers on a function return type are
4528 normally permitted by the standard but have no
4529 effect, so give a warning at -Wreturn-type.
4530 Qualifiers on a void return type are banned on
4531 function definitions in ISO C; GCC used to used
4532 them for noreturn functions. */
4533 if (VOID_TYPE_P (type) && really_funcdef)
4534 pedwarn ("function definition has qualified void return type");
4536 warning (OPT_Wreturn_type,
4537 "type qualifiers ignored on function return type");
4539 type = c_build_qualified_type (type, type_quals);
4541 type_quals = TYPE_UNQUALIFIED;
4543 type = build_function_type (type, arg_types);
4544 declarator = declarator->declarator;
4546 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4547 the formal parameter list of this FUNCTION_TYPE to point to
4548 the FUNCTION_TYPE node itself. */
4552 for (link = arg_info->tags;
4554 link = TREE_CHAIN (link))
4555 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4561 /* Merge any constancy or volatility into the target type
4564 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4566 pedwarn ("ISO C forbids qualified function types");
4568 type = c_build_qualified_type (type, type_quals);
4571 /* When the pointed-to type involves components of variable size,
4572 care must be taken to ensure that the size evaluation code is
4573 emitted early enough to dominate all the possible later uses
4574 and late enough for the variables on which it depends to have
4577 This is expected to happen automatically when the pointed-to
4578 type has a name/declaration of it's own, but special attention
4579 is required if the type is anonymous.
4581 We handle the NORMAL and FIELD contexts here by attaching an
4582 artificial TYPE_DECL to such pointed-to type. This forces the
4583 sizes evaluation at a safe point and ensures it is not deferred
4584 until e.g. within a deeper conditional context.
4586 We expect nothing to be needed here for PARM or TYPENAME.
4587 Pushing a TYPE_DECL at this point for TYPENAME would actually
4588 be incorrect, as we might be in the middle of an expression
4589 with side effects on the pointed-to type size "arguments" prior
4590 to the pointer declaration point and the fake TYPE_DECL in the
4591 enclosing context would force the size evaluation prior to the
4594 if (!TYPE_NAME (type)
4595 && (decl_context == NORMAL || decl_context == FIELD)
4596 && variably_modified_type_p (type, NULL_TREE))
4598 tree decl = build_decl (TYPE_DECL, NULL_TREE, type);
4599 DECL_ARTIFICIAL (decl) = 1;
4601 finish_decl (decl, NULL_TREE, NULL_TREE);
4602 TYPE_NAME (type) = decl;
4605 type = build_pointer_type (type);
4607 /* Process type qualifiers (such as const or volatile)
4608 that were given inside the `*'. */
4609 type_quals = declarator->u.pointer_quals;
4611 declarator = declarator->declarator;
4619 /* Now TYPE has the actual type, apart from any qualifiers in
4622 /* Check the type and width of a bit-field. */
4624 check_bitfield_type_and_width (&type, width, orig_name);
4626 /* Did array size calculations overflow? */
4628 if (TREE_CODE (type) == ARRAY_TYPE
4629 && COMPLETE_TYPE_P (type)
4630 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4631 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4633 error ("size of array %qs is too large", name);
4634 /* If we proceed with the array type as it is, we'll eventually
4635 crash in tree_low_cst(). */
4636 type = error_mark_node;
4639 /* If this is declaring a typedef name, return a TYPE_DECL. */
4641 if (storage_class == csc_typedef)
4644 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4646 pedwarn ("ISO C forbids qualified function types");
4648 type = c_build_qualified_type (type, type_quals);
4649 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4650 if (declspecs->explicit_signed_p)
4651 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4652 decl_attributes (&decl, returned_attrs, 0);
4653 if (declspecs->inline_p)
4654 pedwarn ("typedef %q+D declared %<inline%>", decl);
4658 /* If this is a type name (such as, in a cast or sizeof),
4659 compute the type and return it now. */
4661 if (decl_context == TYPENAME)
4663 /* Note that the grammar rejects storage classes in typenames
4665 gcc_assert (storage_class == csc_none && !threadp
4666 && !declspecs->inline_p);
4667 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4669 pedwarn ("ISO C forbids const or volatile function types");
4671 type = c_build_qualified_type (type, type_quals);
4672 decl_attributes (&type, returned_attrs, 0);
4676 if (pedantic && decl_context == FIELD
4677 && variably_modified_type_p (type, NULL_TREE))
4680 pedwarn ("a member of a structure or union cannot have a variably modified type");
4683 /* Aside from typedefs and type names (handle above),
4684 `void' at top level (not within pointer)
4685 is allowed only in public variables.
4686 We don't complain about parms either, but that is because
4687 a better error message can be made later. */
4689 if (VOID_TYPE_P (type) && decl_context != PARM
4690 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4691 && (storage_class == csc_extern
4692 || (current_scope == file_scope
4693 && !(storage_class == csc_static
4694 || storage_class == csc_register)))))
4696 error ("variable or field %qs declared void", name);
4697 type = integer_type_node;
4700 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4701 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4706 if (decl_context == PARM)
4708 tree type_as_written;
4711 /* A parameter declared as an array of T is really a pointer to T.
4712 One declared as a function is really a pointer to a function. */
4714 if (TREE_CODE (type) == ARRAY_TYPE)
4716 /* Transfer const-ness of array into that of type pointed to. */
4717 type = TREE_TYPE (type);
4719 type = c_build_qualified_type (type, type_quals);
4720 type = build_pointer_type (type);
4721 type_quals = array_ptr_quals;
4723 type = c_build_qualified_type (type, type_quals);
4725 /* We don't yet implement attributes in this context. */
4726 if (array_ptr_attrs != NULL_TREE)
4727 warning (OPT_Wattributes,
4728 "attributes in parameter array declarator ignored");
4732 else if (TREE_CODE (type) == FUNCTION_TYPE)
4734 if (pedantic && type_quals)
4735 pedwarn ("ISO C forbids qualified function types");
4737 type = c_build_qualified_type (type, type_quals);
4738 type = build_pointer_type (type);
4739 type_quals = TYPE_UNQUALIFIED;
4741 else if (type_quals)
4742 type = c_build_qualified_type (type, type_quals);
4744 type_as_written = type;
4746 decl = build_decl (PARM_DECL, declarator->u.id, type);
4748 C_DECL_VARIABLE_SIZE (decl) = 1;
4750 /* Compute the type actually passed in the parmlist,
4751 for the case where there is no prototype.
4752 (For example, shorts and chars are passed as ints.)
4753 When there is a prototype, this is overridden later. */
4755 if (type == error_mark_node)
4756 promoted_type = type;
4758 promoted_type = c_type_promotes_to (type);
4760 DECL_ARG_TYPE (decl) = promoted_type;
4761 if (declspecs->inline_p)
4762 pedwarn ("parameter %q+D declared %<inline%>", decl);
4764 else if (decl_context == FIELD)
4766 /* Note that the grammar rejects storage classes in typenames
4768 gcc_assert (storage_class == csc_none && !threadp
4769 && !declspecs->inline_p);
4771 /* Structure field. It may not be a function. */
4773 if (TREE_CODE (type) == FUNCTION_TYPE)
4775 error ("field %qs declared as a function", name);
4776 type = build_pointer_type (type);
4778 else if (TREE_CODE (type) != ERROR_MARK
4779 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4781 error ("field %qs has incomplete type", name);
4782 type = error_mark_node;
4784 type = c_build_qualified_type (type, type_quals);
4785 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4786 DECL_NONADDRESSABLE_P (decl) = bitfield;
4787 if (bitfield && !declarator->u.id)
4788 TREE_NO_WARNING (decl) = 1;
4791 C_DECL_VARIABLE_SIZE (decl) = 1;
4793 else if (TREE_CODE (type) == FUNCTION_TYPE)
4795 if (storage_class == csc_register || threadp)
4797 error ("invalid storage class for function %qs", name);
4799 else if (current_scope != file_scope)
4801 /* Function declaration not at file scope. Storage
4802 classes other than `extern' are not allowed, C99
4803 6.7.1p5, and `extern' makes no difference. However,
4804 GCC allows 'auto', perhaps with 'inline', to support
4805 nested functions. */
4806 if (storage_class == csc_auto)
4809 pedwarn ("invalid storage class for function %qs", name);
4811 else if (storage_class == csc_static)
4813 error ("invalid storage class for function %qs", name);
4815 storage_class = declspecs->storage_class = csc_none;
4821 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4822 decl = build_decl_attribute_variant (decl, decl_attr);
4824 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4826 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4827 pedwarn ("ISO C forbids qualified function types");
4829 /* GNU C interprets a volatile-qualified function type to indicate
4830 that the function does not return. */
4831 if ((type_quals & TYPE_QUAL_VOLATILE)
4832 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4833 warning (0, "%<noreturn%> function returns non-void value");
4835 /* Every function declaration is an external reference
4836 (DECL_EXTERNAL) except for those which are not at file
4837 scope and are explicitly declared "auto". This is
4838 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4839 GCC to signify a forward declaration of a nested function. */
4840 if (storage_class == csc_auto && current_scope != file_scope)
4841 DECL_EXTERNAL (decl) = 0;
4842 /* In C99, a function which is declared 'inline' with 'extern'
4843 is not an external reference (which is confusing). It
4844 means that the later definition of the function must be output
4845 in this file, C99 6.7.4p6. In GNU C89, a function declared
4846 'extern inline' is an external reference. */
4847 else if (declspecs->inline_p && storage_class != csc_static)
4848 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
4849 == flag_gnu89_inline);
4851 DECL_EXTERNAL (decl) = !initialized;
4853 /* Record absence of global scope for `static' or `auto'. */
4855 = !(storage_class == csc_static || storage_class == csc_auto);
4857 /* For a function definition, record the argument information
4858 block where store_parm_decls will look for it. */
4860 current_function_arg_info = arg_info;
4862 if (declspecs->default_int_p)
4863 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4865 /* Record presence of `inline', if it is reasonable. */
4866 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4868 if (declspecs->inline_p)
4869 pedwarn ("cannot inline function %<main%>");
4871 else if (declspecs->inline_p)
4873 /* Record that the function is declared `inline'. */
4874 DECL_DECLARED_INLINE_P (decl) = 1;
4876 /* Do not mark bare declarations as DECL_INLINE. Doing so
4877 in the presence of multiple declarations can result in
4878 the abstract origin pointing between the declarations,
4879 which will confuse dwarf2out. */
4881 DECL_INLINE (decl) = 1;
4883 /* If -finline-functions, assume it can be inlined. This does
4884 two things: let the function be deferred until it is actually
4885 needed, and let dwarf2 know that the function is inlinable. */
4886 else if (flag_inline_trees == 2 && initialized)
4887 DECL_INLINE (decl) = 1;
4891 /* It's a variable. */
4892 /* An uninitialized decl with `extern' is a reference. */
4893 int extern_ref = !initialized && storage_class == csc_extern;
4895 type = c_build_qualified_type (type, type_quals);
4897 /* C99 6.2.2p7: It is invalid (compile-time undefined
4898 behavior) to create an 'extern' declaration for a
4899 variable if there is a global declaration that is
4900 'static' and the global declaration is not visible.
4901 (If the static declaration _is_ currently visible,
4902 the 'extern' declaration is taken to refer to that decl.) */
4903 if (extern_ref && current_scope != file_scope)
4905 tree global_decl = identifier_global_value (declarator->u.id);
4906 tree visible_decl = lookup_name (declarator->u.id);
4909 && global_decl != visible_decl
4910 && TREE_CODE (global_decl) == VAR_DECL
4911 && !TREE_PUBLIC (global_decl))
4912 error ("variable previously declared %<static%> redeclared "
4916 decl = build_decl (VAR_DECL, declarator->u.id, type);
4917 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4919 C_DECL_VARIABLE_SIZE (decl) = 1;
4921 if (declspecs->inline_p)
4922 pedwarn ("variable %q+D declared %<inline%>", decl);
4924 /* At file scope, an initialized extern declaration may follow
4925 a static declaration. In that case, DECL_EXTERNAL will be
4926 reset later in start_decl. */
4927 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4929 /* At file scope, the presence of a `static' or `register' storage
4930 class specifier, or the absence of all storage class specifiers
4931 makes this declaration a definition (perhaps tentative). Also,
4932 the absence of `static' makes it public. */
4933 if (current_scope == file_scope)
4935 TREE_PUBLIC (decl) = storage_class != csc_static;
4936 TREE_STATIC (decl) = !extern_ref;
4938 /* Not at file scope, only `static' makes a static definition. */
4941 TREE_STATIC (decl) = (storage_class == csc_static);
4942 TREE_PUBLIC (decl) = extern_ref;
4946 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4949 if (storage_class == csc_extern
4950 && variably_modified_type_p (type, NULL_TREE))
4953 error ("object with variably modified type must have no linkage");
4956 /* Record `register' declaration for warnings on &
4957 and in case doing stupid register allocation. */
4959 if (storage_class == csc_register)
4961 C_DECL_REGISTER (decl) = 1;
4962 DECL_REGISTER (decl) = 1;
4965 /* Record constancy and volatility. */
4966 c_apply_type_quals_to_decl (type_quals, decl);
4968 /* If a type has volatile components, it should be stored in memory.
4969 Otherwise, the fact that those components are volatile
4970 will be ignored, and would even crash the compiler.
4971 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4972 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4973 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4974 || TREE_CODE (decl) == RESULT_DECL))
4976 /* It is not an error for a structure with volatile fields to
4977 be declared register, but reset DECL_REGISTER since it
4978 cannot actually go in a register. */
4979 int was_reg = C_DECL_REGISTER (decl);
4980 C_DECL_REGISTER (decl) = 0;
4981 DECL_REGISTER (decl) = 0;
4982 c_mark_addressable (decl);
4983 C_DECL_REGISTER (decl) = was_reg;
4986 /* This is the earliest point at which we might know the assembler
4987 name of a variable. Thus, if it's known before this, die horribly. */
4988 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4990 decl_attributes (&decl, returned_attrs, 0);
4996 /* Decode the parameter-list info for a function type or function definition.
4997 The argument is the value returned by `get_parm_info' (or made in c-parse.c
4998 if there is an identifier list instead of a parameter decl list).
4999 These two functions are separate because when a function returns
5000 or receives functions then each is called multiple times but the order
5001 of calls is different. The last call to `grokparms' is always the one
5002 that contains the formal parameter names of a function definition.
5004 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5006 FUNCDEF_FLAG is true for a function definition, false for
5007 a mere declaration. A nonempty identifier-list gets an error message
5008 when FUNCDEF_FLAG is false. */
5011 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
5013 tree arg_types = arg_info->types;
5015 if (funcdef_flag && arg_info->had_vla_unspec)
5017 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5019 error ("%<[*]%> not allowed in other than function prototype scope");
5022 if (arg_types == 0 && !funcdef_flag && !in_system_header)
5023 warning (OPT_Wstrict_prototypes,
5024 "function declaration isn%'t a prototype");
5026 if (arg_types == error_mark_node)
5027 return 0; /* don't set TYPE_ARG_TYPES in this case */
5029 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
5032 pedwarn ("parameter names (without types) in function declaration");
5034 arg_info->parms = arg_info->types;
5035 arg_info->types = 0;
5040 tree parm, type, typelt;
5041 unsigned int parmno;
5043 /* If there is a parameter of incomplete type in a definition,
5044 this is an error. In a declaration this is valid, and a
5045 struct or union type may be completed later, before any calls
5046 or definition of the function. In the case where the tag was
5047 first declared within the parameter list, a warning has
5048 already been given. If a parameter has void type, then
5049 however the function cannot be defined or called, so
5052 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
5054 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
5056 type = TREE_VALUE (typelt);
5057 if (type == error_mark_node)
5060 if (!COMPLETE_TYPE_P (type))
5064 if (DECL_NAME (parm))
5065 error ("parameter %u (%q+D) has incomplete type",
5068 error ("%Jparameter %u has incomplete type",
5071 TREE_VALUE (typelt) = error_mark_node;
5072 TREE_TYPE (parm) = error_mark_node;
5074 else if (VOID_TYPE_P (type))
5076 if (DECL_NAME (parm))
5077 warning (0, "parameter %u (%q+D) has void type",
5080 warning (0, "%Jparameter %u has void type",
5085 if (DECL_NAME (parm) && TREE_USED (parm))
5086 warn_if_shadowing (parm);
5092 /* Take apart the current scope and return a c_arg_info structure with
5093 info on a parameter list just parsed.
5095 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5097 ELLIPSIS being true means the argument list ended in '...' so don't
5098 append a sentinel (void_list_node) to the end of the type-list. */
5101 get_parm_info (bool ellipsis)
5103 struct c_binding *b = current_scope->bindings;
5104 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
5111 static bool explained_incomplete_types = false;
5112 bool gave_void_only_once_err = false;
5114 arg_info->parms = 0;
5116 arg_info->types = 0;
5117 arg_info->others = 0;
5118 arg_info->pending_sizes = 0;
5119 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
5121 /* The bindings in this scope must not get put into a block.
5122 We will take care of deleting the binding nodes. */
5123 current_scope->bindings = 0;
5125 /* This function is only called if there was *something* on the
5129 /* A parameter list consisting solely of 'void' indicates that the
5130 function takes no arguments. But if the 'void' is qualified
5131 (by 'const' or 'volatile'), or has a storage class specifier
5132 ('register'), then the behavior is undefined; issue an error.
5133 Typedefs for 'void' are OK (see DR#157). */
5134 if (b->prev == 0 /* one binding */
5135 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
5136 && !DECL_NAME (b->decl) /* anonymous */
5137 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
5139 if (TREE_THIS_VOLATILE (b->decl)
5140 || TREE_READONLY (b->decl)
5141 || C_DECL_REGISTER (b->decl))
5142 error ("%<void%> as only parameter may not be qualified");
5144 /* There cannot be an ellipsis. */
5146 error ("%<void%> must be the only parameter");
5148 arg_info->types = void_list_node;
5153 types = void_list_node;
5155 /* Break up the bindings list into parms, tags, types, and others;
5156 apply sanity checks; purge the name-to-decl bindings. */
5159 tree decl = b->decl;
5160 tree type = TREE_TYPE (decl);
5161 const char *keyword;
5163 switch (TREE_CODE (decl))
5168 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5169 I_SYMBOL_BINDING (b->id) = b->shadowed;
5172 /* Check for forward decls that never got their actual decl. */
5173 if (TREE_ASM_WRITTEN (decl))
5174 error ("parameter %q+D has just a forward declaration", decl);
5175 /* Check for (..., void, ...) and issue an error. */
5176 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
5178 if (!gave_void_only_once_err)
5180 error ("%<void%> must be the only parameter");
5181 gave_void_only_once_err = true;
5186 /* Valid parameter, add it to the list. */
5187 TREE_CHAIN (decl) = parms;
5190 /* Since there is a prototype, args are passed in their
5191 declared types. The back end may override this later. */
5192 DECL_ARG_TYPE (decl) = type;
5193 types = tree_cons (0, type, types);
5197 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
5198 case UNION_TYPE: keyword = "union"; goto tag;
5199 case RECORD_TYPE: keyword = "struct"; goto tag;
5201 /* Types may not have tag-names, in which case the type
5202 appears in the bindings list with b->id NULL. */
5205 gcc_assert (I_TAG_BINDING (b->id) == b);
5206 I_TAG_BINDING (b->id) = b->shadowed;
5209 /* Warn about any struct, union or enum tags defined in a
5210 parameter list. The scope of such types is limited to
5211 the parameter list, which is rarely if ever desirable
5212 (it's impossible to call such a function with type-
5213 correct arguments). An anonymous union parm type is
5214 meaningful as a GNU extension, so don't warn for that. */
5215 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
5218 /* The %s will be one of 'struct', 'union', or 'enum'. */
5219 warning (0, "%<%s %E%> declared inside parameter list",
5222 /* The %s will be one of 'struct', 'union', or 'enum'. */
5223 warning (0, "anonymous %s declared inside parameter list",
5226 if (!explained_incomplete_types)
5228 warning (0, "its scope is only this definition or declaration,"
5229 " which is probably not what you want");
5230 explained_incomplete_types = true;
5234 tags = tree_cons (b->id, decl, tags);
5240 /* CONST_DECLs appear here when we have an embedded enum,
5241 and TYPE_DECLs appear here when we have an embedded struct
5242 or union. No warnings for this - we already warned about the
5243 type itself. FUNCTION_DECLs appear when there is an implicit
5244 function declaration in the parameter list. */
5246 TREE_CHAIN (decl) = others;
5251 /* error_mark_node appears here when we have an undeclared
5252 variable. Just throw it away. */
5255 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5256 I_SYMBOL_BINDING (b->id) = b->shadowed;
5260 /* Other things that might be encountered. */
5267 b = free_binding_and_advance (b);
5270 arg_info->parms = parms;
5271 arg_info->tags = tags;
5272 arg_info->types = types;
5273 arg_info->others = others;
5274 arg_info->pending_sizes = get_pending_sizes ();
5278 /* Get the struct, enum or union (CODE says which) with tag NAME.
5279 Define the tag as a forward-reference if it is not defined.
5280 Return a c_typespec structure for the type specifier. */
5283 parser_xref_tag (enum tree_code code, tree name)
5285 struct c_typespec ret;
5286 /* If a cross reference is requested, look up the type
5287 already defined for this tag and return it. */
5289 tree ref = lookup_tag (code, name, 0);
5290 /* If this is the right type of tag, return what we found.
5291 (This reference will be shadowed by shadow_tag later if appropriate.)
5292 If this is the wrong type of tag, do not return it. If it was the
5293 wrong type in the same scope, we will have had an error
5294 message already; if in a different scope and declaring
5295 a name, pending_xref_error will give an error message; but if in a
5296 different scope and not declaring a name, this tag should
5297 shadow the previous declaration of a different type of tag, and
5298 this would not work properly if we return the reference found.
5299 (For example, with "struct foo" in an outer scope, "union foo;"
5300 must shadow that tag with a new one of union type.) */
5301 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5302 if (ref && TREE_CODE (ref) == code)
5308 /* If no such tag is yet defined, create a forward-reference node
5309 and record it as the "definition".
5310 When a real declaration of this type is found,
5311 the forward-reference will be altered into a real type. */
5313 ref = make_node (code);
5314 if (code == ENUMERAL_TYPE)
5316 /* Give the type a default layout like unsigned int
5317 to avoid crashing if it does not get defined. */
5318 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5319 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5320 TYPE_USER_ALIGN (ref) = 0;
5321 TYPE_UNSIGNED (ref) = 1;
5322 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5323 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5324 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5327 pushtag (name, ref);
5333 /* Get the struct, enum or union (CODE says which) with tag NAME.
5334 Define the tag as a forward-reference if it is not defined.
5335 Return a tree for the type. */
5338 xref_tag (enum tree_code code, tree name)
5340 return parser_xref_tag (code, name).spec;
5343 /* Make sure that the tag NAME is defined *in the current scope*
5344 at least as a forward reference.
5345 CODE says which kind of tag NAME ought to be. */
5348 start_struct (enum tree_code code, tree name)
5350 /* If there is already a tag defined at this scope
5351 (as a forward reference), just return it. */
5356 ref = lookup_tag (code, name, 1);
5357 if (ref && TREE_CODE (ref) == code)
5359 if (TYPE_SIZE (ref))
5361 if (code == UNION_TYPE)
5362 error ("redefinition of %<union %E%>", name);
5364 error ("redefinition of %<struct %E%>", name);
5366 else if (C_TYPE_BEING_DEFINED (ref))
5368 if (code == UNION_TYPE)
5369 error ("nested redefinition of %<union %E%>", name);
5371 error ("nested redefinition of %<struct %E%>", name);
5372 /* Don't create structures that contain themselves. */
5377 /* Otherwise create a forward-reference just so the tag is in scope. */
5379 if (ref == NULL_TREE || TREE_CODE (ref) != code)
5381 ref = make_node (code);
5382 pushtag (name, ref);
5385 C_TYPE_BEING_DEFINED (ref) = 1;
5386 TYPE_PACKED (ref) = flag_pack_struct;
5390 /* Process the specs, declarator and width (NULL if omitted)
5391 of a structure component, returning a FIELD_DECL node.
5392 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5394 This is done during the parsing of the struct declaration.
5395 The FIELD_DECL nodes are chained together and the lot of them
5396 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5399 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5404 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5405 && width == NULL_TREE)
5407 /* This is an unnamed decl.
5409 If we have something of the form "union { list } ;" then this
5410 is the anonymous union extension. Similarly for struct.
5412 If this is something of the form "struct foo;", then
5413 If MS extensions are enabled, this is handled as an
5415 Otherwise this is a forward declaration of a structure tag.
5417 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5418 If MS extensions are enabled and foo names a structure, then
5419 again this is an anonymous struct.
5420 Otherwise this is an error.
5422 Oh what a horrid tangled web we weave. I wonder if MS consciously
5423 took this from Plan 9 or if it was an accident of implementation
5424 that took root before someone noticed the bug... */
5426 tree type = declspecs->type;
5427 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5428 || TREE_CODE (type) == UNION_TYPE);
5432 && (flag_ms_extensions || !declspecs->typedef_p))
5434 if (flag_ms_extensions)
5438 else if (TYPE_NAME (type) == NULL)
5445 pedwarn ("declaration does not declare anything");
5449 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5452 value = grokdeclarator (declarator, declspecs, FIELD, false,
5453 width ? &width : NULL, DEPRECATED_NORMAL);
5455 finish_decl (value, NULL_TREE, NULL_TREE);
5456 DECL_INITIAL (value) = width;
5461 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5462 the list such that this does not present a problem later. */
5465 detect_field_duplicates (tree fieldlist)
5470 /* First, see if there are more than "a few" fields.
5471 This is trivially true if there are zero or one fields. */
5474 x = TREE_CHAIN (fieldlist);
5480 } while (timeout > 0 && x);
5482 /* If there were "few" fields, avoid the overhead of allocating
5483 a hash table. Instead just do the nested traversal thing. */
5486 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5489 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5490 if (DECL_NAME (y) == DECL_NAME (x))
5492 error ("duplicate member %q+D", x);
5493 DECL_NAME (x) = NULL_TREE;
5499 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5502 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5503 if ((y = DECL_NAME (x)) != 0)
5505 slot = htab_find_slot (htab, y, INSERT);
5508 error ("duplicate member %q+D", x);
5509 DECL_NAME (x) = NULL_TREE;
5518 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5519 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5520 ATTRIBUTES are attributes to be applied to the structure. */
5523 finish_struct (tree t, tree fieldlist, tree attributes)
5526 bool toplevel = file_scope == current_scope;
5527 int saw_named_field;
5529 /* If this type was previously laid out as a forward reference,
5530 make sure we lay it out again. */
5534 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5538 for (x = fieldlist; x; x = TREE_CHAIN (x))
5539 if (DECL_NAME (x) != 0)
5544 if (TREE_CODE (t) == UNION_TYPE)
5547 pedwarn ("union has no named members");
5549 pedwarn ("union has no members");
5554 pedwarn ("struct has no named members");
5556 pedwarn ("struct has no members");
5561 /* Install struct as DECL_CONTEXT of each field decl.
5562 Also process specified field sizes, found in the DECL_INITIAL,
5563 storing 0 there after the type has been changed to precision equal
5564 to its width, rather than the precision of the specified standard
5565 type. (Correct layout requires the original type to have been preserved
5568 saw_named_field = 0;
5569 for (x = fieldlist; x; x = TREE_CHAIN (x))
5571 if (TREE_TYPE (x) == error_mark_node)
5574 DECL_CONTEXT (x) = t;
5576 if (TYPE_PACKED (t) && TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)
5577 DECL_PACKED (x) = 1;
5579 /* If any field is const, the structure type is pseudo-const. */
5580 if (TREE_READONLY (x))
5581 C_TYPE_FIELDS_READONLY (t) = 1;
5584 /* A field that is pseudo-const makes the structure likewise. */
5585 tree t1 = TREE_TYPE (x);
5586 while (TREE_CODE (t1) == ARRAY_TYPE)
5587 t1 = TREE_TYPE (t1);
5588 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5589 && C_TYPE_FIELDS_READONLY (t1))
5590 C_TYPE_FIELDS_READONLY (t) = 1;
5593 /* Any field that is volatile means variables of this type must be
5594 treated in some ways as volatile. */
5595 if (TREE_THIS_VOLATILE (x))
5596 C_TYPE_FIELDS_VOLATILE (t) = 1;
5598 /* Any field of nominal variable size implies structure is too. */
5599 if (C_DECL_VARIABLE_SIZE (x))
5600 C_TYPE_VARIABLE_SIZE (t) = 1;
5602 if (DECL_INITIAL (x))
5604 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5605 DECL_SIZE (x) = bitsize_int (width);
5606 DECL_BIT_FIELD (x) = 1;
5607 SET_DECL_C_BIT_FIELD (x);
5610 /* Detect flexible array member in an invalid context. */
5611 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5612 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5613 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5614 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5616 if (TREE_CODE (t) == UNION_TYPE)
5618 error ("%Jflexible array member in union", x);
5619 TREE_TYPE (x) = error_mark_node;
5621 else if (TREE_CHAIN (x) != NULL_TREE)
5623 error ("%Jflexible array member not at end of struct", x);
5624 TREE_TYPE (x) = error_mark_node;
5626 else if (!saw_named_field)
5628 error ("%Jflexible array member in otherwise empty struct", x);
5629 TREE_TYPE (x) = error_mark_node;
5633 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5634 && flexible_array_type_p (TREE_TYPE (x)))
5635 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5638 saw_named_field = 1;
5641 detect_field_duplicates (fieldlist);
5643 /* Now we have the nearly final fieldlist. Record it,
5644 then lay out the structure or union (including the fields). */
5646 TYPE_FIELDS (t) = fieldlist;
5650 /* Give bit-fields their proper types. */
5652 tree *fieldlistp = &fieldlist;
5654 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5655 && TREE_TYPE (*fieldlistp) != error_mark_node)
5657 unsigned HOST_WIDE_INT width
5658 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5659 tree type = TREE_TYPE (*fieldlistp);
5660 if (width != TYPE_PRECISION (type))
5662 TREE_TYPE (*fieldlistp)
5663 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5664 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5666 DECL_INITIAL (*fieldlistp) = 0;
5669 fieldlistp = &TREE_CHAIN (*fieldlistp);
5672 /* Now we have the truly final field list.
5673 Store it in this type and in the variants. */
5675 TYPE_FIELDS (t) = fieldlist;
5677 /* If there are lots of fields, sort so we can look through them fast.
5678 We arbitrarily consider 16 or more elts to be "a lot". */
5683 for (x = fieldlist; x; x = TREE_CHAIN (x))
5685 if (len > 15 || DECL_NAME (x) == NULL)
5693 struct lang_type *space;
5694 struct sorted_fields_type *space2;
5696 len += list_length (x);
5698 /* Use the same allocation policy here that make_node uses, to
5699 ensure that this lives as long as the rest of the struct decl.
5700 All decls in an inline function need to be saved. */
5702 space = GGC_CNEW (struct lang_type);
5703 space2 = GGC_NEWVAR (struct sorted_fields_type,
5704 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5708 field_array = &space2->elts[0];
5709 for (x = fieldlist; x; x = TREE_CHAIN (x))
5711 field_array[len++] = x;
5713 /* If there is anonymous struct or union, break out of the loop. */
5714 if (DECL_NAME (x) == NULL)
5717 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5720 TYPE_LANG_SPECIFIC (t) = space;
5721 TYPE_LANG_SPECIFIC (t)->s->len = len;
5722 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5723 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5728 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5730 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5731 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5732 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5733 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5734 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5737 /* If this was supposed to be a transparent union, but we can't
5738 make it one, warn and turn off the flag. */
5739 if (TREE_CODE (t) == UNION_TYPE
5740 && TYPE_TRANSPARENT_UNION (t)
5741 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5743 TYPE_TRANSPARENT_UNION (t) = 0;
5744 warning (0, "union cannot be made transparent");
5747 /* If this structure or union completes the type of any previous
5748 variable declaration, lay it out and output its rtl. */
5749 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5753 tree decl = TREE_VALUE (x);
5754 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5755 layout_array_type (TREE_TYPE (decl));
5756 if (TREE_CODE (decl) != TYPE_DECL)
5758 layout_decl (decl, 0);
5759 if (c_dialect_objc ())
5760 objc_check_decl (decl);
5761 rest_of_decl_compilation (decl, toplevel, 0);
5766 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5768 /* Finish debugging output for this type. */
5769 rest_of_type_compilation (t, toplevel);
5771 /* If we're inside a function proper, i.e. not file-scope and not still
5772 parsing parameters, then arrange for the size of a variable sized type
5774 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
5775 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5780 /* Lay out the type T, and its element type, and so on. */
5783 layout_array_type (tree t)
5785 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5786 layout_array_type (TREE_TYPE (t));
5790 /* Begin compiling the definition of an enumeration type.
5791 NAME is its name (or null if anonymous).
5792 Returns the type object, as yet incomplete.
5793 Also records info about it so that build_enumerator
5794 may be used to declare the individual values as they are read. */
5797 start_enum (struct c_enum_contents *the_enum, tree name)
5801 /* If this is the real definition for a previous forward reference,
5802 fill in the contents in the same object that used to be the
5803 forward reference. */
5806 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5808 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5810 enumtype = make_node (ENUMERAL_TYPE);
5811 pushtag (name, enumtype);
5814 if (C_TYPE_BEING_DEFINED (enumtype))
5815 error ("nested redefinition of %<enum %E%>", name);
5817 C_TYPE_BEING_DEFINED (enumtype) = 1;
5819 if (TYPE_VALUES (enumtype) != 0)
5821 /* This enum is a named one that has been declared already. */
5822 error ("redeclaration of %<enum %E%>", name);
5824 /* Completely replace its old definition.
5825 The old enumerators remain defined, however. */
5826 TYPE_VALUES (enumtype) = 0;
5829 the_enum->enum_next_value = integer_zero_node;
5830 the_enum->enum_overflow = 0;
5832 if (flag_short_enums)
5833 TYPE_PACKED (enumtype) = 1;
5838 /* After processing and defining all the values of an enumeration type,
5839 install their decls in the enumeration type and finish it off.
5840 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5841 and ATTRIBUTES are the specified attributes.
5842 Returns ENUMTYPE. */
5845 finish_enum (tree enumtype, tree values, tree attributes)
5848 tree minnode = 0, maxnode = 0;
5849 int precision, unsign;
5850 bool toplevel = (file_scope == current_scope);
5851 struct lang_type *lt;
5853 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5855 /* Calculate the maximum value of any enumerator in this type. */
5857 if (values == error_mark_node)
5858 minnode = maxnode = integer_zero_node;
5861 minnode = maxnode = TREE_VALUE (values);
5862 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5864 tree value = TREE_VALUE (pair);
5865 if (tree_int_cst_lt (maxnode, value))
5867 if (tree_int_cst_lt (value, minnode))
5872 /* Construct the final type of this enumeration. It is the same
5873 as one of the integral types - the narrowest one that fits, except
5874 that normally we only go as narrow as int - and signed iff any of
5875 the values are negative. */
5876 unsign = (tree_int_cst_sgn (minnode) >= 0);
5877 precision = MAX (min_precision (minnode, unsign),
5878 min_precision (maxnode, unsign));
5880 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5882 tem = c_common_type_for_size (precision, unsign);
5885 warning (0, "enumeration values exceed range of largest integer");
5886 tem = long_long_integer_type_node;
5890 tem = unsign ? unsigned_type_node : integer_type_node;
5892 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5893 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5894 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5895 TYPE_SIZE (enumtype) = 0;
5897 /* If the precision of the type was specific with an attribute and it
5898 was too small, give an error. Otherwise, use it. */
5899 if (TYPE_PRECISION (enumtype))
5901 if (precision > TYPE_PRECISION (enumtype))
5902 error ("specified mode too small for enumeral values");
5905 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5907 layout_type (enumtype);
5909 if (values != error_mark_node)
5911 /* Change the type of the enumerators to be the enum type. We
5912 need to do this irrespective of the size of the enum, for
5913 proper type checking. Replace the DECL_INITIALs of the
5914 enumerators, and the value slots of the list, with copies
5915 that have the enum type; they cannot be modified in place
5916 because they may be shared (e.g. integer_zero_node) Finally,
5917 change the purpose slots to point to the names of the decls. */
5918 for (pair = values; pair; pair = TREE_CHAIN (pair))
5920 tree enu = TREE_PURPOSE (pair);
5921 tree ini = DECL_INITIAL (enu);
5923 TREE_TYPE (enu) = enumtype;
5925 /* The ISO C Standard mandates enumerators to have type int,
5926 even though the underlying type of an enum type is
5927 unspecified. Here we convert any enumerators that fit in
5928 an int to type int, to avoid promotions to unsigned types
5929 when comparing integers with enumerators that fit in the
5930 int range. When -pedantic is given, build_enumerator()
5931 would have already taken care of those that don't fit. */
5932 if (int_fits_type_p (ini, integer_type_node))
5933 tem = integer_type_node;
5936 ini = convert (tem, ini);
5938 DECL_INITIAL (enu) = ini;
5939 TREE_PURPOSE (pair) = DECL_NAME (enu);
5940 TREE_VALUE (pair) = ini;
5943 TYPE_VALUES (enumtype) = values;
5946 /* Record the min/max values so that we can warn about bit-field
5947 enumerations that are too small for the values. */
5948 lt = GGC_CNEW (struct lang_type);
5949 lt->enum_min = minnode;
5950 lt->enum_max = maxnode;
5951 TYPE_LANG_SPECIFIC (enumtype) = lt;
5953 /* Fix up all variant types of this enum type. */
5954 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5956 if (tem == enumtype)
5958 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5959 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5960 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5961 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5962 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5963 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5964 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5965 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5966 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5967 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5968 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5971 /* Finish debugging output for this type. */
5972 rest_of_type_compilation (enumtype, toplevel);
5977 /* Build and install a CONST_DECL for one value of the
5978 current enumeration type (one that was begun with start_enum).
5979 Return a tree-list containing the CONST_DECL and its value.
5980 Assignment of sequential values by default is handled here. */
5983 build_enumerator (struct c_enum_contents *the_enum, tree name, tree value)
5987 /* Validate and default VALUE. */
5991 /* Don't issue more errors for error_mark_node (i.e. an
5992 undeclared identifier) - just ignore the value expression. */
5993 if (value == error_mark_node)
5995 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5996 || TREE_CODE (value) != INTEGER_CST)
5998 error ("enumerator value for %qE is not an integer constant", name);
6003 value = default_conversion (value);
6004 constant_expression_warning (value);
6008 /* Default based on previous value. */
6009 /* It should no longer be possible to have NON_LVALUE_EXPR
6013 value = the_enum->enum_next_value;
6014 if (the_enum->enum_overflow)
6015 error ("overflow in enumeration values");
6018 if (pedantic && !int_fits_type_p (value, integer_type_node))
6020 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
6021 /* XXX This causes -pedantic to change the meaning of the program.
6022 Remove? -zw 2004-03-15 */
6023 value = convert (integer_type_node, value);
6026 /* Set basis for default for next value. */
6027 the_enum->enum_next_value = build_binary_op (PLUS_EXPR, value,
6028 integer_one_node, 0);
6029 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
6031 /* Now create a declaration for the enum value name. */
6033 type = TREE_TYPE (value);
6034 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
6035 TYPE_PRECISION (integer_type_node)),
6036 (TYPE_PRECISION (type)
6037 >= TYPE_PRECISION (integer_type_node)
6038 && TYPE_UNSIGNED (type)));
6040 decl = build_decl (CONST_DECL, name, type);
6041 DECL_INITIAL (decl) = convert (type, value);
6044 return tree_cons (decl, value, NULL_TREE);
6048 /* Create the FUNCTION_DECL for a function definition.
6049 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6050 the declaration; they describe the function's name and the type it returns,
6051 but twisted together in a fashion that parallels the syntax of C.
6053 This function creates a binding context for the function body
6054 as well as setting up the FUNCTION_DECL in current_function_decl.
6056 Returns 1 on success. If the DECLARATOR is not suitable for a function
6057 (it defines a datum instead), we return 0, which tells
6058 yyparse to report a parse error. */
6061 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
6064 tree decl1, old_decl;
6065 tree restype, resdecl;
6066 struct c_label_context_se *nstack_se;
6067 struct c_label_context_vm *nstack_vm;
6069 current_function_returns_value = 0; /* Assume, until we see it does. */
6070 current_function_returns_null = 0;
6071 current_function_returns_abnormally = 0;
6072 warn_about_return_type = 0;
6073 c_switch_stack = NULL;
6075 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
6076 nstack_se->labels_def = NULL;
6077 nstack_se->labels_used = NULL;
6078 nstack_se->next = label_context_stack_se;
6079 label_context_stack_se = nstack_se;
6081 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
6082 nstack_vm->labels_def = NULL;
6083 nstack_vm->labels_used = NULL;
6084 nstack_vm->scope = 0;
6085 nstack_vm->next = label_context_stack_vm;
6086 label_context_stack_vm = nstack_vm;
6088 /* Indicate no valid break/continue context by setting these variables
6089 to some non-null, non-label value. We'll notice and emit the proper
6090 error message in c_finish_bc_stmt. */
6091 c_break_label = c_cont_label = size_zero_node;
6093 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
6096 /* If the declarator is not suitable for a function definition,
6097 cause a syntax error. */
6100 label_context_stack_se = label_context_stack_se->next;
6101 label_context_stack_vm = label_context_stack_vm->next;
6105 decl_attributes (&decl1, attributes, 0);
6107 if (DECL_DECLARED_INLINE_P (decl1)
6108 && DECL_UNINLINABLE (decl1)
6109 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6110 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
6113 /* Handle gnu_inline attribute. */
6114 if (declspecs->inline_p
6115 && !flag_gnu89_inline
6116 && TREE_CODE (decl1) == FUNCTION_DECL
6117 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1)))
6119 if (declspecs->storage_class != csc_static)
6120 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
6123 announce_function (decl1);
6125 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6127 error ("return type is an incomplete type");
6128 /* Make it return void instead. */
6130 = build_function_type (void_type_node,
6131 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6134 if (warn_about_return_type)
6135 pedwarn_c99 ("return type defaults to %<int%>");
6137 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6138 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6139 DECL_INITIAL (decl1) = error_mark_node;
6141 /* If this definition isn't a prototype and we had a prototype declaration
6142 before, copy the arg type info from that prototype. */
6143 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
6144 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
6146 current_function_prototype_locus = UNKNOWN_LOCATION;
6147 current_function_prototype_built_in = false;
6148 current_function_prototype_arg_types = NULL_TREE;
6149 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6151 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6152 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6153 TREE_TYPE (TREE_TYPE (old_decl))))
6155 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
6157 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
6158 current_function_prototype_built_in
6159 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
6160 current_function_prototype_arg_types
6161 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
6163 if (TREE_PUBLIC (decl1))
6165 /* If there is an external prototype declaration of this
6166 function, record its location but do not copy information
6167 to this decl. This may be an invisible declaration
6168 (built-in or in a scope which has finished) or simply
6169 have more refined argument types than any declaration
6171 struct c_binding *b;
6172 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
6173 if (B_IN_SCOPE (b, external_scope))
6177 tree ext_decl, ext_type;
6179 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
6180 if (TREE_CODE (ext_type) == FUNCTION_TYPE
6181 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6182 TREE_TYPE (ext_type)))
6184 current_function_prototype_locus
6185 = DECL_SOURCE_LOCATION (ext_decl);
6186 current_function_prototype_built_in
6187 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
6188 current_function_prototype_arg_types
6189 = TYPE_ARG_TYPES (ext_type);
6195 /* Optionally warn of old-fashioned def with no previous prototype. */
6196 if (warn_strict_prototypes
6197 && old_decl != error_mark_node
6198 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6199 && C_DECL_ISNT_PROTOTYPE (old_decl))
6200 warning (OPT_Wstrict_prototypes,
6201 "function declaration isn%'t a prototype");
6202 /* Optionally warn of any global def with no previous prototype. */
6203 else if (warn_missing_prototypes
6204 && old_decl != error_mark_node
6205 && TREE_PUBLIC (decl1)
6206 && !MAIN_NAME_P (DECL_NAME (decl1))
6207 && C_DECL_ISNT_PROTOTYPE (old_decl))
6208 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
6209 /* Optionally warn of any def with no previous prototype
6210 if the function has already been used. */
6211 else if (warn_missing_prototypes
6213 && old_decl != error_mark_node
6214 && TREE_USED (old_decl)
6215 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6216 warning (OPT_Wmissing_prototypes,
6217 "%q+D was used with no prototype before its definition", decl1);
6218 /* Optionally warn of any global def with no previous declaration. */
6219 else if (warn_missing_declarations
6220 && TREE_PUBLIC (decl1)
6222 && !MAIN_NAME_P (DECL_NAME (decl1)))
6223 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
6225 /* Optionally warn of any def with no previous declaration
6226 if the function has already been used. */
6227 else if (warn_missing_declarations
6229 && old_decl != error_mark_node
6230 && TREE_USED (old_decl)
6231 && C_DECL_IMPLICIT (old_decl))
6232 warning (OPT_Wmissing_declarations,
6233 "%q+D was used with no declaration before its definition", decl1);
6235 /* This function exists in static storage.
6236 (This does not mean `static' in the C sense!) */
6237 TREE_STATIC (decl1) = 1;
6239 /* A nested function is not global. */
6240 if (current_function_decl != 0)
6241 TREE_PUBLIC (decl1) = 0;
6243 /* This is the earliest point at which we might know the assembler
6244 name of the function. Thus, if it's set before this, die horribly. */
6245 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
6247 /* If #pragma weak was used, mark the decl weak now. */
6248 if (current_scope == file_scope)
6249 maybe_apply_pragma_weak (decl1);
6251 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6252 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6254 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6255 != integer_type_node)
6256 pedwarn ("return type of %q+D is not %<int%>", decl1);
6258 check_main_parameter_types(decl1);
6260 if (!TREE_PUBLIC (decl1))
6261 pedwarn ("%q+D is normally a non-static function", decl1);
6264 /* Record the decl so that the function name is defined.
6265 If we already have a decl for this name, and it is a FUNCTION_DECL,
6266 use the old decl. */
6268 current_function_decl = pushdecl (decl1);
6271 declare_parm_level ();
6273 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6274 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6275 DECL_ARTIFICIAL (resdecl) = 1;
6276 DECL_IGNORED_P (resdecl) = 1;
6277 DECL_RESULT (current_function_decl) = resdecl;
6279 start_fname_decls ();
6284 /* Subroutine of store_parm_decls which handles new-style function
6285 definitions (prototype format). The parms already have decls, so we
6286 need only record them as in effect and complain if any redundant
6287 old-style parm decls were written. */
6289 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6293 if (current_scope->bindings)
6295 error ("%Jold-style parameter declarations in prototyped "
6296 "function definition", fndecl);
6298 /* Get rid of the old-style declarations. */
6302 /* Don't issue this warning for nested functions, and don't issue this
6303 warning if we got here because ARG_INFO_TYPES was error_mark_node
6304 (this happens when a function definition has just an ellipsis in
6305 its parameter list). */
6306 else if (!in_system_header && !current_function_scope
6307 && arg_info->types != error_mark_node)
6308 warning (OPT_Wtraditional,
6309 "%Jtraditional C rejects ISO C style function definitions",
6312 /* Now make all the parameter declarations visible in the function body.
6313 We can bypass most of the grunt work of pushdecl. */
6314 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6316 DECL_CONTEXT (decl) = current_function_decl;
6317 if (DECL_NAME (decl))
6319 bind (DECL_NAME (decl), decl, current_scope,
6320 /*invisible=*/false, /*nested=*/false);
6321 if (!TREE_USED (decl))
6322 warn_if_shadowing (decl);
6325 error ("%Jparameter name omitted", decl);
6328 /* Record the parameter list in the function declaration. */
6329 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6331 /* Now make all the ancillary declarations visible, likewise. */
6332 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6334 DECL_CONTEXT (decl) = current_function_decl;
6335 if (DECL_NAME (decl))
6336 bind (DECL_NAME (decl), decl, current_scope,
6337 /*invisible=*/false, /*nested=*/false);
6340 /* And all the tag declarations. */
6341 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6342 if (TREE_PURPOSE (decl))
6343 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6344 /*invisible=*/false, /*nested=*/false);
6347 /* Subroutine of store_parm_decls which handles old-style function
6348 definitions (separate parameter list and declarations). */
6351 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6353 struct c_binding *b;
6354 tree parm, decl, last;
6355 tree parmids = arg_info->parms;
6356 struct pointer_set_t *seen_args = pointer_set_create ();
6358 if (!in_system_header)
6359 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6362 /* Match each formal parameter name with its declaration. Save each
6363 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6364 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6366 if (TREE_VALUE (parm) == 0)
6368 error ("%Jparameter name missing from parameter list", fndecl);
6369 TREE_PURPOSE (parm) = 0;
6373 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6374 if (b && B_IN_CURRENT_SCOPE (b))
6377 /* If we got something other than a PARM_DECL it is an error. */
6378 if (TREE_CODE (decl) != PARM_DECL)
6379 error ("%q+D declared as a non-parameter", decl);
6380 /* If the declaration is already marked, we have a duplicate
6381 name. Complain and ignore the duplicate. */
6382 else if (pointer_set_contains (seen_args, decl))
6384 error ("multiple parameters named %q+D", decl);
6385 TREE_PURPOSE (parm) = 0;
6388 /* If the declaration says "void", complain and turn it into
6390 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6392 error ("parameter %q+D declared with void type", decl);
6393 TREE_TYPE (decl) = integer_type_node;
6394 DECL_ARG_TYPE (decl) = integer_type_node;
6395 layout_decl (decl, 0);
6397 warn_if_shadowing (decl);
6399 /* If no declaration found, default to int. */
6402 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6403 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6404 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6406 warn_if_shadowing (decl);
6409 pedwarn ("type of %q+D defaults to %<int%>", decl);
6411 warning (OPT_Wmissing_parameter_type, "type of %q+D defaults to %<int%>", decl);
6414 TREE_PURPOSE (parm) = decl;
6415 pointer_set_insert (seen_args, decl);
6418 /* Now examine the parms chain for incomplete declarations
6419 and declarations with no corresponding names. */
6421 for (b = current_scope->bindings; b; b = b->prev)
6424 if (TREE_CODE (parm) != PARM_DECL)
6427 if (TREE_TYPE (parm) != error_mark_node
6428 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6430 error ("parameter %q+D has incomplete type", parm);
6431 TREE_TYPE (parm) = error_mark_node;
6434 if (!pointer_set_contains (seen_args, parm))
6436 error ("declaration for parameter %q+D but no such parameter", parm);
6438 /* Pretend the parameter was not missing.
6439 This gets us to a standard state and minimizes
6440 further error messages. */
6441 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6445 /* Chain the declarations together in the order of the list of
6446 names. Store that chain in the function decl, replacing the
6447 list of names. Update the current scope to match. */
6448 DECL_ARGUMENTS (fndecl) = 0;
6450 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6451 if (TREE_PURPOSE (parm))
6453 if (parm && TREE_PURPOSE (parm))
6455 last = TREE_PURPOSE (parm);
6456 DECL_ARGUMENTS (fndecl) = last;
6458 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6459 if (TREE_PURPOSE (parm))
6461 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6462 last = TREE_PURPOSE (parm);
6464 TREE_CHAIN (last) = 0;
6467 pointer_set_destroy (seen_args);
6469 /* If there was a previous prototype,
6470 set the DECL_ARG_TYPE of each argument according to
6471 the type previously specified, and report any mismatches. */
6473 if (current_function_prototype_arg_types)
6476 for (parm = DECL_ARGUMENTS (fndecl),
6477 type = current_function_prototype_arg_types;
6478 parm || (type && TREE_VALUE (type) != error_mark_node
6479 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
6480 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6482 if (parm == 0 || type == 0
6483 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6485 if (current_function_prototype_built_in)
6486 warning (0, "number of arguments doesn%'t match "
6487 "built-in prototype");
6490 error ("number of arguments doesn%'t match prototype");
6491 error ("%Hprototype declaration",
6492 ¤t_function_prototype_locus);
6496 /* Type for passing arg must be consistent with that
6497 declared for the arg. ISO C says we take the unqualified
6498 type for parameters declared with qualified type. */
6499 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6500 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6502 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6503 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6505 /* Adjust argument to match prototype. E.g. a previous
6506 `int foo(float);' prototype causes
6507 `int foo(x) float x; {...}' to be treated like
6508 `int foo(float x) {...}'. This is particularly
6509 useful for argument types like uid_t. */
6510 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6512 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6513 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6514 && TYPE_PRECISION (TREE_TYPE (parm))
6515 < TYPE_PRECISION (integer_type_node))
6516 DECL_ARG_TYPE (parm) = integer_type_node;
6520 /* ??? Is it possible to get here with a
6521 built-in prototype or will it always have
6522 been diagnosed as conflicting with an
6523 old-style definition and discarded? */
6524 if (current_function_prototype_built_in)
6525 warning (0, "promoted argument %qD "
6526 "doesn%'t match built-in prototype", parm);
6529 pedwarn ("promoted argument %qD "
6530 "doesn%'t match prototype", parm);
6531 pedwarn ("%Hprototype declaration",
6532 ¤t_function_prototype_locus);
6538 if (current_function_prototype_built_in)
6539 warning (0, "argument %qD doesn%'t match "
6540 "built-in prototype", parm);
6543 error ("argument %qD doesn%'t match prototype", parm);
6544 error ("%Hprototype declaration",
6545 ¤t_function_prototype_locus);
6550 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6553 /* Otherwise, create a prototype that would match. */
6557 tree actual = 0, last = 0, type;
6559 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6561 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6563 TREE_CHAIN (last) = type;
6568 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6570 TREE_CHAIN (last) = type;
6574 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6575 of the type of this function, but we need to avoid having this
6576 affect the types of other similarly-typed functions, so we must
6577 first force the generation of an identical (but separate) type
6578 node for the relevant function type. The new node we create
6579 will be a variant of the main variant of the original function
6582 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6584 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6588 /* Store parameter declarations passed in ARG_INFO into the current
6589 function declaration. */
6592 store_parm_decls_from (struct c_arg_info *arg_info)
6594 current_function_arg_info = arg_info;
6595 store_parm_decls ();
6598 /* Store the parameter declarations into the current function declaration.
6599 This is called after parsing the parameter declarations, before
6600 digesting the body of the function.
6602 For an old-style definition, construct a prototype out of the old-style
6603 parameter declarations and inject it into the function's type. */
6606 store_parm_decls (void)
6608 tree fndecl = current_function_decl;
6611 /* The argument information block for FNDECL. */
6612 struct c_arg_info *arg_info = current_function_arg_info;
6613 current_function_arg_info = 0;
6615 /* True if this definition is written with a prototype. Note:
6616 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6617 list in a function definition as equivalent to (void) -- an
6618 empty argument list specifies the function has no parameters,
6619 but only (void) sets up a prototype for future calls. */
6620 proto = arg_info->types != 0;
6623 store_parm_decls_newstyle (fndecl, arg_info);
6625 store_parm_decls_oldstyle (fndecl, arg_info);
6627 /* The next call to push_scope will be a function body. */
6629 next_is_function_body = true;
6631 /* Write a record describing this function definition to the prototypes
6632 file (if requested). */
6634 gen_aux_info_record (fndecl, 1, 0, proto);
6636 /* Initialize the RTL code for the function. */
6637 allocate_struct_function (fndecl);
6639 /* Begin the statement tree for this function. */
6640 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6642 /* ??? Insert the contents of the pending sizes list into the function
6643 to be evaluated. The only reason left to have this is
6644 void foo(int n, int array[n++])
6645 because we throw away the array type in favor of a pointer type, and
6646 thus won't naturally see the SAVE_EXPR containing the increment. All
6647 other pending sizes would be handled by gimplify_parameters. */
6650 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6651 add_stmt (TREE_VALUE (t));
6654 /* Even though we're inside a function body, we still don't want to
6655 call expand_expr to calculate the size of a variable-sized array.
6656 We haven't necessarily assigned RTL to all variables yet, so it's
6657 not safe to try to expand expressions involving them. */
6658 cfun->x_dont_save_pending_sizes_p = 1;
6661 /* Emit diagnostics that require gimple input for detection. Operate on
6662 FNDECL and all its nested functions. */
6665 c_gimple_diagnostics_recursively (tree fndecl)
6667 struct cgraph_node *cgn;
6669 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6670 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6672 /* Notice when OpenMP structured block constraints are violated. */
6674 diagnose_omp_structured_block_errors (fndecl);
6676 /* Finalize all nested functions now. */
6677 cgn = cgraph_node (fndecl);
6678 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6679 c_gimple_diagnostics_recursively (cgn->decl);
6682 /* Finish up a function declaration and compile that function
6683 all the way to assembler language output. The free the storage
6684 for the function definition.
6686 This is called after parsing the body of the function definition. */
6689 finish_function (void)
6691 tree fndecl = current_function_decl;
6693 label_context_stack_se = label_context_stack_se->next;
6694 label_context_stack_vm = label_context_stack_vm->next;
6696 if (TREE_CODE (fndecl) == FUNCTION_DECL
6697 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6699 tree args = DECL_ARGUMENTS (fndecl);
6700 for (; args; args = TREE_CHAIN (args))
6702 tree type = TREE_TYPE (args);
6703 if (INTEGRAL_TYPE_P (type)
6704 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6705 DECL_ARG_TYPE (args) = integer_type_node;
6709 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6710 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6712 /* Must mark the RESULT_DECL as being in this function. */
6714 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6715 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6717 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6719 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6720 != integer_type_node)
6722 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6723 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6725 pedwarn ("return type of %q+D is not %<int%>", fndecl);
6731 tree stmt = c_finish_return (integer_zero_node);
6732 #ifdef USE_MAPPED_LOCATION
6733 /* Hack. We don't want the middle-end to warn that this return
6734 is unreachable, so we mark its location as special. Using
6735 UNKNOWN_LOCATION has the problem that it gets clobbered in
6736 annotate_one_with_locus. A cleaner solution might be to
6737 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6739 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6741 /* Hack. We don't want the middle-end to warn that this
6742 return is unreachable, so put the statement on the
6744 annotate_with_file_line (stmt, input_filename, 0);
6750 /* Tie off the statement tree for this function. */
6751 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6753 finish_fname_decls ();
6755 /* Complain if there's just no return statement. */
6756 if (warn_return_type
6757 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6758 && !current_function_returns_value && !current_function_returns_null
6759 /* Don't complain if we are no-return. */
6760 && !current_function_returns_abnormally
6761 /* Don't warn for main(). */
6762 && !MAIN_NAME_P (DECL_NAME (fndecl))
6763 /* Or if they didn't actually specify a return type. */
6764 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6765 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6766 inline function, as we might never be compiled separately. */
6767 && DECL_INLINE (fndecl))
6769 warning (OPT_Wreturn_type,
6770 "no return statement in function returning non-void");
6771 TREE_NO_WARNING (fndecl) = 1;
6774 /* Store the end of the function, so that we get good line number
6775 info for the epilogue. */
6776 cfun->function_end_locus = input_location;
6778 /* Finalize the ELF visibility for the function. */
6779 c_determine_visibility (fndecl);
6781 /* For GNU C extern inline functions disregard inline limits. */
6782 if (DECL_EXTERNAL (fndecl)
6783 && DECL_DECLARED_INLINE_P (fndecl))
6784 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
6786 /* Genericize before inlining. Delay genericizing nested functions
6787 until their parent function is genericized. Since finalizing
6788 requires GENERIC, delay that as well. */
6790 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6791 && !undef_nested_function)
6793 if (!decl_function_context (fndecl))
6795 c_genericize (fndecl);
6796 c_gimple_diagnostics_recursively (fndecl);
6798 /* ??? Objc emits functions after finalizing the compilation unit.
6799 This should be cleaned up later and this conditional removed. */
6800 if (cgraph_global_info_ready)
6802 cgraph_add_new_function (fndecl, false);
6806 cgraph_finalize_function (fndecl, false);
6810 /* Register this function with cgraph just far enough to get it
6811 added to our parent's nested function list. Handy, since the
6812 C front end doesn't have such a list. */
6813 (void) cgraph_node (fndecl);
6817 if (!decl_function_context (fndecl))
6818 undef_nested_function = false;
6820 /* We're leaving the context of this function, so zap cfun.
6821 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6822 tree_rest_of_compilation. */
6824 current_function_decl = NULL;
6827 /* Check the declarations given in a for-loop for satisfying the C99
6828 constraints. If exactly one such decl is found, return it. */
6831 check_for_loop_decls (void)
6833 struct c_binding *b;
6834 tree one_decl = NULL_TREE;
6840 /* If we get here, declarations have been used in a for loop without
6841 the C99 for loop scope. This doesn't make much sense, so don't
6843 error ("%<for%> loop initial declaration used outside C99 mode");
6846 /* C99 subclause 6.8.5 paragraph 3:
6848 [#3] The declaration part of a for statement shall only
6849 declare identifiers for objects having storage class auto or
6852 It isn't clear whether, in this sentence, "identifiers" binds to
6853 "shall only declare" or to "objects" - that is, whether all identifiers
6854 declared must be identifiers for objects, or whether the restriction
6855 only applies to those that are. (A question on this in comp.std.c
6856 in November 2000 received no answer.) We implement the strictest
6857 interpretation, to avoid creating an extension which later causes
6860 for (b = current_scope->bindings; b; b = b->prev)
6863 tree decl = b->decl;
6868 switch (TREE_CODE (decl))
6871 if (TREE_STATIC (decl))
6872 error ("declaration of static variable %q+D in %<for%> loop "
6873 "initial declaration", decl);
6874 else if (DECL_EXTERNAL (decl))
6875 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6876 "initial declaration", decl);
6880 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6884 error ("%<union %E%> declared in %<for%> loop initial declaration",
6888 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6892 error ("declaration of non-variable %q+D in %<for%> loop "
6893 "initial declaration", decl);
6900 return n_decls == 1 ? one_decl : NULL_TREE;
6903 /* Save and reinitialize the variables
6904 used during compilation of a C function. */
6907 c_push_function_context (struct function *f)
6909 struct language_function *p;
6910 p = GGC_NEW (struct language_function);
6913 p->base.x_stmt_tree = c_stmt_tree;
6914 p->x_break_label = c_break_label;
6915 p->x_cont_label = c_cont_label;
6916 p->x_switch_stack = c_switch_stack;
6917 p->arg_info = current_function_arg_info;
6918 p->returns_value = current_function_returns_value;
6919 p->returns_null = current_function_returns_null;
6920 p->returns_abnormally = current_function_returns_abnormally;
6921 p->warn_about_return_type = warn_about_return_type;
6924 /* Restore the variables used during compilation of a C function. */
6927 c_pop_function_context (struct function *f)
6929 struct language_function *p = f->language;
6931 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6932 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6934 /* Stop pointing to the local nodes about to be freed. */
6935 /* But DECL_INITIAL must remain nonzero so we know this
6936 was an actual function definition. */
6937 DECL_INITIAL (current_function_decl) = error_mark_node;
6938 DECL_ARGUMENTS (current_function_decl) = 0;
6941 c_stmt_tree = p->base.x_stmt_tree;
6942 c_break_label = p->x_break_label;
6943 c_cont_label = p->x_cont_label;
6944 c_switch_stack = p->x_switch_stack;
6945 current_function_arg_info = p->arg_info;
6946 current_function_returns_value = p->returns_value;
6947 current_function_returns_null = p->returns_null;
6948 current_function_returns_abnormally = p->returns_abnormally;
6949 warn_about_return_type = p->warn_about_return_type;
6954 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6957 c_dup_lang_specific_decl (tree decl)
6959 struct lang_decl *ld;
6961 if (!DECL_LANG_SPECIFIC (decl))
6964 ld = GGC_NEW (struct lang_decl);
6965 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6966 DECL_LANG_SPECIFIC (decl) = ld;
6969 /* The functions below are required for functionality of doing
6970 function at once processing in the C front end. Currently these
6971 functions are not called from anywhere in the C front end, but as
6972 these changes continue, that will change. */
6974 /* Returns the stmt_tree (if any) to which statements are currently
6975 being added. If there is no active statement-tree, NULL is
6979 current_stmt_tree (void)
6981 return &c_stmt_tree;
6984 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6988 anon_aggr_type_p (const_tree ARG_UNUSED (node))
6993 /* Return the global value of T as a symbol. */
6996 identifier_global_value (tree t)
6998 struct c_binding *b;
7000 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
7001 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
7007 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7008 otherwise the name is found in ridpointers from RID_INDEX. */
7011 record_builtin_type (enum rid rid_index, const char *name, tree type)
7015 id = ridpointers[(int) rid_index];
7017 id = get_identifier (name);
7018 decl = build_decl (TYPE_DECL, id, type);
7020 if (debug_hooks->type_decl)
7021 debug_hooks->type_decl (decl, false);
7024 /* Build the void_list_node (void_type_node having been created). */
7026 build_void_list_node (void)
7028 tree t = build_tree_list (NULL_TREE, void_type_node);
7032 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
7035 build_c_parm (struct c_declspecs *specs, tree attrs,
7036 struct c_declarator *declarator)
7038 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
7041 ret->declarator = declarator;
7045 /* Return a declarator with nested attributes. TARGET is the inner
7046 declarator to which these attributes apply. ATTRS are the
7049 struct c_declarator *
7050 build_attrs_declarator (tree attrs, struct c_declarator *target)
7052 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7053 ret->kind = cdk_attrs;
7054 ret->declarator = target;
7055 ret->u.attrs = attrs;
7059 /* Return a declarator for a function with arguments specified by ARGS
7060 and return type specified by TARGET. */
7062 struct c_declarator *
7063 build_function_declarator (struct c_arg_info *args,
7064 struct c_declarator *target)
7066 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7067 ret->kind = cdk_function;
7068 ret->declarator = target;
7069 ret->u.arg_info = args;
7073 /* Return a declarator for the identifier IDENT (which may be
7074 NULL_TREE for an abstract declarator). */
7076 struct c_declarator *
7077 build_id_declarator (tree ident)
7079 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7081 ret->declarator = 0;
7083 /* Default value - may get reset to a more precise location. */
7084 ret->id_loc = input_location;
7088 /* Return something to represent absolute declarators containing a *.
7089 TARGET is the absolute declarator that the * contains.
7090 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7091 to apply to the pointer type. */
7093 struct c_declarator *
7094 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
7095 struct c_declarator *target)
7099 struct c_declarator *itarget = target;
7100 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7101 if (type_quals_attrs)
7103 attrs = type_quals_attrs->attrs;
7104 quals = quals_from_declspecs (type_quals_attrs);
7105 if (attrs != NULL_TREE)
7106 itarget = build_attrs_declarator (attrs, target);
7108 ret->kind = cdk_pointer;
7109 ret->declarator = itarget;
7110 ret->u.pointer_quals = quals;
7114 /* Return a pointer to a structure for an empty list of declaration
7117 struct c_declspecs *
7118 build_null_declspecs (void)
7120 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
7124 ret->typespec_word = cts_none;
7125 ret->storage_class = csc_none;
7126 ret->declspecs_seen_p = false;
7127 ret->type_seen_p = false;
7128 ret->non_sc_seen_p = false;
7129 ret->typedef_p = false;
7130 ret->tag_defined_p = false;
7131 ret->explicit_signed_p = false;
7132 ret->deprecated_p = false;
7133 ret->default_int_p = false;
7134 ret->long_p = false;
7135 ret->long_long_p = false;
7136 ret->short_p = false;
7137 ret->signed_p = false;
7138 ret->unsigned_p = false;
7139 ret->complex_p = false;
7140 ret->inline_p = false;
7141 ret->thread_p = false;
7142 ret->const_p = false;
7143 ret->volatile_p = false;
7144 ret->restrict_p = false;
7145 ret->saturating_p = false;
7149 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7152 struct c_declspecs *
7153 declspecs_add_qual (struct c_declspecs *specs, tree qual)
7157 specs->non_sc_seen_p = true;
7158 specs->declspecs_seen_p = true;
7159 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
7160 && C_IS_RESERVED_WORD (qual));
7161 i = C_RID_CODE (qual);
7165 dupe = specs->const_p;
7166 specs->const_p = true;
7169 dupe = specs->volatile_p;
7170 specs->volatile_p = true;
7173 dupe = specs->restrict_p;
7174 specs->restrict_p = true;
7179 if (dupe && pedantic && !flag_isoc99)
7180 pedwarn ("duplicate %qE", qual);
7184 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7187 struct c_declspecs *
7188 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7190 tree type = spec.spec;
7191 specs->non_sc_seen_p = true;
7192 specs->declspecs_seen_p = true;
7193 specs->type_seen_p = true;
7194 if (TREE_DEPRECATED (type))
7195 specs->deprecated_p = true;
7197 /* Handle type specifier keywords. */
7198 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
7200 enum rid i = C_RID_CODE (type);
7203 error ("two or more data types in declaration specifiers");
7206 if ((int) i <= (int) RID_LAST_MODIFIER)
7208 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
7213 if (specs->long_long_p)
7215 error ("%<long long long%> is too long for GCC");
7220 if (specs->typespec_word == cts_double)
7222 error ("both %<long long%> and %<double%> in "
7223 "declaration specifiers");
7226 if (pedantic && !flag_isoc99 && !in_system_header
7228 pedwarn ("ISO C90 does not support %<long long%>");
7229 specs->long_long_p = 1;
7233 error ("both %<long%> and %<short%> in "
7234 "declaration specifiers");
7235 else if (specs->typespec_word == cts_void)
7236 error ("both %<long%> and %<void%> in "
7237 "declaration specifiers");
7238 else if (specs->typespec_word == cts_bool)
7239 error ("both %<long%> and %<_Bool%> in "
7240 "declaration specifiers");
7241 else if (specs->typespec_word == cts_char)
7242 error ("both %<long%> and %<char%> in "
7243 "declaration specifiers");
7244 else if (specs->typespec_word == cts_float)
7245 error ("both %<long%> and %<float%> in "
7246 "declaration specifiers");
7247 else if (specs->typespec_word == cts_dfloat32)
7248 error ("both %<long%> and %<_Decimal32%> in "
7249 "declaration specifiers");
7250 else if (specs->typespec_word == cts_dfloat64)
7251 error ("both %<long%> and %<_Decimal64%> in "
7252 "declaration specifiers");
7253 else if (specs->typespec_word == cts_dfloat128)
7254 error ("both %<long%> and %<_Decimal128%> in "
7255 "declaration specifiers");
7257 specs->long_p = true;
7260 dupe = specs->short_p;
7262 error ("both %<long%> and %<short%> in "
7263 "declaration specifiers");
7264 else if (specs->typespec_word == cts_void)
7265 error ("both %<short%> and %<void%> in "
7266 "declaration specifiers");
7267 else if (specs->typespec_word == cts_bool)
7268 error ("both %<short%> and %<_Bool%> in "
7269 "declaration specifiers");
7270 else if (specs->typespec_word == cts_char)
7271 error ("both %<short%> and %<char%> in "
7272 "declaration specifiers");
7273 else if (specs->typespec_word == cts_float)
7274 error ("both %<short%> and %<float%> in "
7275 "declaration specifiers");
7276 else if (specs->typespec_word == cts_double)
7277 error ("both %<short%> and %<double%> in "
7278 "declaration specifiers");
7279 else if (specs->typespec_word == cts_dfloat32)
7280 error ("both %<short%> and %<_Decimal32%> in "
7281 "declaration specifiers");
7282 else if (specs->typespec_word == cts_dfloat64)
7283 error ("both %<short%> and %<_Decimal64%> in "
7284 "declaration specifiers");
7285 else if (specs->typespec_word == cts_dfloat128)
7286 error ("both %<short%> and %<_Decimal128%> in "
7287 "declaration specifiers");
7289 specs->short_p = true;
7292 dupe = specs->signed_p;
7293 if (specs->unsigned_p)
7294 error ("both %<signed%> and %<unsigned%> in "
7295 "declaration specifiers");
7296 else if (specs->typespec_word == cts_void)
7297 error ("both %<signed%> and %<void%> in "
7298 "declaration specifiers");
7299 else if (specs->typespec_word == cts_bool)
7300 error ("both %<signed%> and %<_Bool%> in "
7301 "declaration specifiers");
7302 else if (specs->typespec_word == cts_float)
7303 error ("both %<signed%> and %<float%> in "
7304 "declaration specifiers");
7305 else if (specs->typespec_word == cts_double)
7306 error ("both %<signed%> and %<double%> in "
7307 "declaration specifiers");
7308 else if (specs->typespec_word == cts_dfloat32)
7309 error ("both %<signed%> and %<_Decimal32%> in "
7310 "declaration specifiers");
7311 else if (specs->typespec_word == cts_dfloat64)
7312 error ("both %<signed%> and %<_Decimal64%> in "
7313 "declaration specifiers");
7314 else if (specs->typespec_word == cts_dfloat128)
7315 error ("both %<signed%> and %<_Decimal128%> in "
7316 "declaration specifiers");
7318 specs->signed_p = true;
7321 dupe = specs->unsigned_p;
7322 if (specs->signed_p)
7323 error ("both %<signed%> and %<unsigned%> in "
7324 "declaration specifiers");
7325 else if (specs->typespec_word == cts_void)
7326 error ("both %<unsigned%> and %<void%> in "
7327 "declaration specifiers");
7328 else if (specs->typespec_word == cts_bool)
7329 error ("both %<unsigned%> and %<_Bool%> in "
7330 "declaration specifiers");
7331 else if (specs->typespec_word == cts_float)
7332 error ("both %<unsigned%> and %<float%> in "
7333 "declaration specifiers");
7334 else if (specs->typespec_word == cts_double)
7335 error ("both %<unsigned%> and %<double%> in "
7336 "declaration specifiers");
7337 else if (specs->typespec_word == cts_dfloat32)
7338 error ("both %<unsigned%> and %<_Decimal32%> in "
7339 "declaration specifiers");
7340 else if (specs->typespec_word == cts_dfloat64)
7341 error ("both %<unsigned%> and %<_Decimal64%> in "
7342 "declaration specifiers");
7343 else if (specs->typespec_word == cts_dfloat128)
7344 error ("both %<unsigned%> and %<_Decimal128%> in "
7345 "declaration specifiers");
7347 specs->unsigned_p = true;
7350 dupe = specs->complex_p;
7351 if (pedantic && !flag_isoc99 && !in_system_header)
7352 pedwarn ("ISO C90 does not support complex types");
7353 if (specs->typespec_word == cts_void)
7354 error ("both %<complex%> and %<void%> in "
7355 "declaration specifiers");
7356 else if (specs->typespec_word == cts_bool)
7357 error ("both %<complex%> and %<_Bool%> in "
7358 "declaration specifiers");
7359 else if (specs->typespec_word == cts_dfloat32)
7360 error ("both %<complex%> and %<_Decimal32%> in "
7361 "declaration specifiers");
7362 else if (specs->typespec_word == cts_dfloat64)
7363 error ("both %<complex%> and %<_Decimal64%> in "
7364 "declaration specifiers");
7365 else if (specs->typespec_word == cts_dfloat128)
7366 error ("both %<complex%> and %<_Decimal128%> in "
7367 "declaration specifiers");
7368 else if (specs->typespec_word == cts_fract)
7369 error ("both %<complex%> and %<_Fract%> in "
7370 "declaration specifiers");
7371 else if (specs->typespec_word == cts_accum)
7372 error ("both %<complex%> and %<_Accum%> in "
7373 "declaration specifiers");
7374 else if (specs->saturating_p)
7375 error ("both %<complex%> and %<_Sat%> in "
7376 "declaration specifiers");
7378 specs->complex_p = true;
7381 dupe = specs->saturating_p;
7383 pedwarn ("ISO C does not support saturating types");
7384 if (specs->typespec_word == cts_void)
7385 error ("both %<_Sat%> and %<void%> in "
7386 "declaration specifiers");
7387 else if (specs->typespec_word == cts_bool)
7388 error ("both %<_Sat%> and %<_Bool%> in "
7389 "declaration specifiers");
7390 else if (specs->typespec_word == cts_char)
7391 error ("both %<_Sat%> and %<char%> in "
7392 "declaration specifiers");
7393 else if (specs->typespec_word == cts_int)
7394 error ("both %<_Sat%> and %<int%> in "
7395 "declaration specifiers");
7396 else if (specs->typespec_word == cts_float)
7397 error ("both %<_Sat%> and %<float%> in "
7398 "declaration specifiers");
7399 else if (specs->typespec_word == cts_double)
7400 error ("both %<_Sat%> and %<double%> in "
7401 "declaration specifiers");
7402 else if (specs->typespec_word == cts_dfloat32)
7403 error ("both %<_Sat%> and %<_Decimal32%> in "
7404 "declaration specifiers");
7405 else if (specs->typespec_word == cts_dfloat64)
7406 error ("both %<_Sat%> and %<_Decimal64%> in "
7407 "declaration specifiers");
7408 else if (specs->typespec_word == cts_dfloat128)
7409 error ("both %<_Sat%> and %<_Decimal128%> in "
7410 "declaration specifiers");
7411 else if (specs->complex_p)
7412 error ("both %<_Sat%> and %<complex%> in "
7413 "declaration specifiers");
7415 specs->saturating_p = true;
7422 error ("duplicate %qE", type);
7428 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
7429 "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
7430 if (specs->typespec_word != cts_none)
7432 error ("two or more data types in declaration specifiers");
7439 error ("both %<long%> and %<void%> in "
7440 "declaration specifiers");
7441 else if (specs->short_p)
7442 error ("both %<short%> and %<void%> in "
7443 "declaration specifiers");
7444 else if (specs->signed_p)
7445 error ("both %<signed%> and %<void%> in "
7446 "declaration specifiers");
7447 else if (specs->unsigned_p)
7448 error ("both %<unsigned%> and %<void%> in "
7449 "declaration specifiers");
7450 else if (specs->complex_p)
7451 error ("both %<complex%> and %<void%> in "
7452 "declaration specifiers");
7453 else if (specs->saturating_p)
7454 error ("both %<_Sat%> and %<void%> in "
7455 "declaration specifiers");
7457 specs->typespec_word = cts_void;
7461 error ("both %<long%> and %<_Bool%> in "
7462 "declaration specifiers");
7463 else if (specs->short_p)
7464 error ("both %<short%> and %<_Bool%> in "
7465 "declaration specifiers");
7466 else if (specs->signed_p)
7467 error ("both %<signed%> and %<_Bool%> in "
7468 "declaration specifiers");
7469 else if (specs->unsigned_p)
7470 error ("both %<unsigned%> and %<_Bool%> in "
7471 "declaration specifiers");
7472 else if (specs->complex_p)
7473 error ("both %<complex%> and %<_Bool%> in "
7474 "declaration specifiers");
7475 else if (specs->saturating_p)
7476 error ("both %<_Sat%> and %<_Bool%> in "
7477 "declaration specifiers");
7479 specs->typespec_word = cts_bool;
7483 error ("both %<long%> and %<char%> in "
7484 "declaration specifiers");
7485 else if (specs->short_p)
7486 error ("both %<short%> and %<char%> in "
7487 "declaration specifiers");
7488 else if (specs->saturating_p)
7489 error ("both %<_Sat%> and %<char%> in "
7490 "declaration specifiers");
7492 specs->typespec_word = cts_char;
7495 if (specs->saturating_p)
7496 error ("both %<_Sat%> and %<int%> in "
7497 "declaration specifiers");
7499 specs->typespec_word = cts_int;
7503 error ("both %<long%> and %<float%> in "
7504 "declaration specifiers");
7505 else if (specs->short_p)
7506 error ("both %<short%> and %<float%> in "
7507 "declaration specifiers");
7508 else if (specs->signed_p)
7509 error ("both %<signed%> and %<float%> in "
7510 "declaration specifiers");
7511 else if (specs->unsigned_p)
7512 error ("both %<unsigned%> and %<float%> in "
7513 "declaration specifiers");
7514 else if (specs->saturating_p)
7515 error ("both %<_Sat%> and %<float%> in "
7516 "declaration specifiers");
7518 specs->typespec_word = cts_float;
7521 if (specs->long_long_p)
7522 error ("both %<long long%> and %<double%> in "
7523 "declaration specifiers");
7524 else if (specs->short_p)
7525 error ("both %<short%> and %<double%> in "
7526 "declaration specifiers");
7527 else if (specs->signed_p)
7528 error ("both %<signed%> and %<double%> in "
7529 "declaration specifiers");
7530 else if (specs->unsigned_p)
7531 error ("both %<unsigned%> and %<double%> in "
7532 "declaration specifiers");
7533 else if (specs->saturating_p)
7534 error ("both %<_Sat%> and %<double%> in "
7535 "declaration specifiers");
7537 specs->typespec_word = cts_double;
7544 if (i == RID_DFLOAT32)
7546 else if (i == RID_DFLOAT64)
7549 str = "_Decimal128";
7550 if (specs->long_long_p)
7551 error ("both %<long long%> and %<%s%> in "
7552 "declaration specifiers", str);
7554 error ("both %<long%> and %<%s%> in "
7555 "declaration specifiers", str);
7556 else if (specs->short_p)
7557 error ("both %<short%> and %<%s%> in "
7558 "declaration specifiers", str);
7559 else if (specs->signed_p)
7560 error ("both %<signed%> and %<%s%> in "
7561 "declaration specifiers", str);
7562 else if (specs->unsigned_p)
7563 error ("both %<unsigned%> and %<%s%> in "
7564 "declaration specifiers", str);
7565 else if (specs->complex_p)
7566 error ("both %<complex%> and %<%s%> in "
7567 "declaration specifiers", str);
7568 else if (specs->saturating_p)
7569 error ("both %<_Sat%> and %<%s%> in "
7570 "declaration specifiers", str);
7571 else if (i == RID_DFLOAT32)
7572 specs->typespec_word = cts_dfloat32;
7573 else if (i == RID_DFLOAT64)
7574 specs->typespec_word = cts_dfloat64;
7576 specs->typespec_word = cts_dfloat128;
7578 if (!targetm.decimal_float_supported_p ())
7579 error ("decimal floating point not supported for this target");
7581 pedwarn ("ISO C does not support decimal floating point");
7591 if (specs->complex_p)
7592 error ("both %<complex%> and %<%s%> in "
7593 "declaration specifiers", str);
7594 else if (i == RID_FRACT)
7595 specs->typespec_word = cts_fract;
7597 specs->typespec_word = cts_accum;
7599 if (!targetm.fixed_point_supported_p ())
7600 error ("fixed-point types not supported for this target");
7602 pedwarn ("ISO C does not support fixed-point types");
7605 /* ObjC reserved word "id", handled below. */
7611 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7612 form of ObjC type, cases such as "int" and "long" being handled
7613 above), a TYPE (struct, union, enum and typeof specifiers) or an
7614 ERROR_MARK. In none of these cases may there have previously
7615 been any type specifiers. */
7616 if (specs->type || specs->typespec_word != cts_none
7617 || specs->long_p || specs->short_p || specs->signed_p
7618 || specs->unsigned_p || specs->complex_p)
7619 error ("two or more data types in declaration specifiers");
7620 else if (TREE_CODE (type) == TYPE_DECL)
7622 if (TREE_TYPE (type) == error_mark_node)
7623 ; /* Allow the type to default to int to avoid cascading errors. */
7626 specs->type = TREE_TYPE (type);
7627 specs->decl_attr = DECL_ATTRIBUTES (type);
7628 specs->typedef_p = true;
7629 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7632 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7634 tree t = lookup_name (type);
7635 if (!t || TREE_CODE (t) != TYPE_DECL)
7636 error ("%qE fails to be a typedef or built in type", type);
7637 else if (TREE_TYPE (t) == error_mark_node)
7640 specs->type = TREE_TYPE (t);
7642 else if (TREE_CODE (type) != ERROR_MARK)
7644 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7645 specs->tag_defined_p = true;
7646 if (spec.kind == ctsk_typeof)
7647 specs->typedef_p = true;
7654 /* Add the storage class specifier or function specifier SCSPEC to the
7655 declaration specifiers SPECS, returning SPECS. */
7657 struct c_declspecs *
7658 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7661 enum c_storage_class n = csc_none;
7663 specs->declspecs_seen_p = true;
7664 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7665 && C_IS_RESERVED_WORD (scspec));
7666 i = C_RID_CODE (scspec);
7667 if (specs->non_sc_seen_p)
7668 warning (OPT_Wold_style_declaration,
7669 "%qE is not at beginning of declaration", scspec);
7673 /* C99 permits duplicate inline. Although of doubtful utility,
7674 it seems simplest to permit it in gnu89 mode as well, as
7675 there is also little utility in maintaining this as a
7676 difference between gnu89 and C99 inline. */
7678 specs->inline_p = true;
7681 dupe = specs->thread_p;
7682 if (specs->storage_class == csc_auto)
7683 error ("%<__thread%> used with %<auto%>");
7684 else if (specs->storage_class == csc_register)
7685 error ("%<__thread%> used with %<register%>");
7686 else if (specs->storage_class == csc_typedef)
7687 error ("%<__thread%> used with %<typedef%>");
7689 specs->thread_p = true;
7696 /* Diagnose "__thread extern". */
7697 if (specs->thread_p)
7698 error ("%<__thread%> before %<extern%>");
7705 /* Diagnose "__thread static". */
7706 if (specs->thread_p)
7707 error ("%<__thread%> before %<static%>");
7715 if (n != csc_none && n == specs->storage_class)
7718 error ("duplicate %qE", scspec);
7721 if (specs->storage_class != csc_none && n != specs->storage_class)
7723 error ("multiple storage classes in declaration specifiers");
7727 specs->storage_class = n;
7728 if (n != csc_extern && n != csc_static && specs->thread_p)
7730 error ("%<__thread%> used with %qE", scspec);
7731 specs->thread_p = false;
7738 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7741 struct c_declspecs *
7742 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7744 specs->attrs = chainon (attrs, specs->attrs);
7745 specs->declspecs_seen_p = true;
7749 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7750 specifiers with any other type specifier to determine the resulting
7751 type. This is where ISO C checks on complex types are made, since
7752 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7755 struct c_declspecs *
7756 finish_declspecs (struct c_declspecs *specs)
7758 /* If a type was specified as a whole, we have no modifiers and are
7760 if (specs->type != NULL_TREE)
7762 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7763 && !specs->signed_p && !specs->unsigned_p
7764 && !specs->complex_p);
7768 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7769 has been specified, treat it as "int" unless "_Complex" is
7770 present and there are no other specifiers. If we just have
7771 "_Complex", it is equivalent to "_Complex double", but e.g.
7772 "_Complex short" is equivalent to "_Complex short int". */
7773 if (specs->typespec_word == cts_none)
7775 if (specs->saturating_p)
7776 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
7777 if (specs->long_p || specs->short_p
7778 || specs->signed_p || specs->unsigned_p)
7780 specs->typespec_word = cts_int;
7782 else if (specs->complex_p)
7784 specs->typespec_word = cts_double;
7786 pedwarn ("ISO C does not support plain %<complex%> meaning "
7787 "%<double complex%>");
7791 specs->typespec_word = cts_int;
7792 specs->default_int_p = true;
7793 /* We don't diagnose this here because grokdeclarator will
7794 give more specific diagnostics according to whether it is
7795 a function definition. */
7799 /* If "signed" was specified, record this to distinguish "int" and
7800 "signed int" in the case of a bit-field with
7801 -funsigned-bitfields. */
7802 specs->explicit_signed_p = specs->signed_p;
7804 /* Now compute the actual type. */
7805 switch (specs->typespec_word)
7808 gcc_assert (!specs->long_p && !specs->short_p
7809 && !specs->signed_p && !specs->unsigned_p
7810 && !specs->complex_p);
7811 specs->type = void_type_node;
7814 gcc_assert (!specs->long_p && !specs->short_p
7815 && !specs->signed_p && !specs->unsigned_p
7816 && !specs->complex_p);
7817 specs->type = boolean_type_node;
7820 gcc_assert (!specs->long_p && !specs->short_p);
7821 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7822 if (specs->signed_p)
7823 specs->type = signed_char_type_node;
7824 else if (specs->unsigned_p)
7825 specs->type = unsigned_char_type_node;
7827 specs->type = char_type_node;
7828 if (specs->complex_p)
7831 pedwarn ("ISO C does not support complex integer types");
7832 specs->type = build_complex_type (specs->type);
7836 gcc_assert (!(specs->long_p && specs->short_p));
7837 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7838 if (specs->long_long_p)
7839 specs->type = (specs->unsigned_p
7840 ? long_long_unsigned_type_node
7841 : long_long_integer_type_node);
7842 else if (specs->long_p)
7843 specs->type = (specs->unsigned_p
7844 ? long_unsigned_type_node
7845 : long_integer_type_node);
7846 else if (specs->short_p)
7847 specs->type = (specs->unsigned_p
7848 ? short_unsigned_type_node
7849 : short_integer_type_node);
7851 specs->type = (specs->unsigned_p
7852 ? unsigned_type_node
7853 : integer_type_node);
7854 if (specs->complex_p)
7857 pedwarn ("ISO C does not support complex integer types");
7858 specs->type = build_complex_type (specs->type);
7862 gcc_assert (!specs->long_p && !specs->short_p
7863 && !specs->signed_p && !specs->unsigned_p);
7864 specs->type = (specs->complex_p
7865 ? complex_float_type_node
7869 gcc_assert (!specs->long_long_p && !specs->short_p
7870 && !specs->signed_p && !specs->unsigned_p);
7873 specs->type = (specs->complex_p
7874 ? complex_long_double_type_node
7875 : long_double_type_node);
7879 specs->type = (specs->complex_p
7880 ? complex_double_type_node
7881 : double_type_node);
7887 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7888 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
7889 if (specs->typespec_word == cts_dfloat32)
7890 specs->type = dfloat32_type_node;
7891 else if (specs->typespec_word == cts_dfloat64)
7892 specs->type = dfloat64_type_node;
7894 specs->type = dfloat128_type_node;
7897 gcc_assert (!specs->complex_p);
7898 if (specs->saturating_p)
7900 if (specs->long_long_p)
7901 specs->type = specs->unsigned_p
7902 ? sat_unsigned_long_long_fract_type_node
7903 : sat_long_long_fract_type_node;
7904 else if (specs->long_p)
7905 specs->type = specs->unsigned_p
7906 ? sat_unsigned_long_fract_type_node
7907 : sat_long_fract_type_node;
7908 else if (specs->short_p)
7909 specs->type = specs->unsigned_p
7910 ? sat_unsigned_short_fract_type_node
7911 : sat_short_fract_type_node;
7913 specs->type = specs->unsigned_p
7914 ? sat_unsigned_fract_type_node
7915 : sat_fract_type_node;
7919 if (specs->long_long_p)
7920 specs->type = specs->unsigned_p
7921 ? unsigned_long_long_fract_type_node
7922 : long_long_fract_type_node;
7923 else if (specs->long_p)
7924 specs->type = specs->unsigned_p
7925 ? unsigned_long_fract_type_node
7926 : long_fract_type_node;
7927 else if (specs->short_p)
7928 specs->type = specs->unsigned_p
7929 ? unsigned_short_fract_type_node
7930 : short_fract_type_node;
7932 specs->type = specs->unsigned_p
7933 ? unsigned_fract_type_node
7938 gcc_assert (!specs->complex_p);
7939 if (specs->saturating_p)
7941 if (specs->long_long_p)
7942 specs->type = specs->unsigned_p
7943 ? sat_unsigned_long_long_accum_type_node
7944 : sat_long_long_accum_type_node;
7945 else if (specs->long_p)
7946 specs->type = specs->unsigned_p
7947 ? sat_unsigned_long_accum_type_node
7948 : sat_long_accum_type_node;
7949 else if (specs->short_p)
7950 specs->type = specs->unsigned_p
7951 ? sat_unsigned_short_accum_type_node
7952 : sat_short_accum_type_node;
7954 specs->type = specs->unsigned_p
7955 ? sat_unsigned_accum_type_node
7956 : sat_accum_type_node;
7960 if (specs->long_long_p)
7961 specs->type = specs->unsigned_p
7962 ? unsigned_long_long_accum_type_node
7963 : long_long_accum_type_node;
7964 else if (specs->long_p)
7965 specs->type = specs->unsigned_p
7966 ? unsigned_long_accum_type_node
7967 : long_accum_type_node;
7968 else if (specs->short_p)
7969 specs->type = specs->unsigned_p
7970 ? unsigned_short_accum_type_node
7971 : short_accum_type_node;
7973 specs->type = specs->unsigned_p
7974 ? unsigned_accum_type_node
7985 /* A subroutine of c_write_global_declarations. Perform final processing
7986 on one file scope's declarations (or the external scope's declarations),
7990 c_write_global_declarations_1 (tree globals)
7995 /* Process the decls in the order they were written. */
7996 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7998 /* Check for used but undefined static functions using the C
7999 standard's definition of "used", and set TREE_NO_WARNING so
8000 that check_global_declarations doesn't repeat the check. */
8001 if (TREE_CODE (decl) == FUNCTION_DECL
8002 && DECL_INITIAL (decl) == 0
8003 && DECL_EXTERNAL (decl)
8004 && !TREE_PUBLIC (decl)
8005 && C_DECL_USED (decl))
8007 pedwarn ("%q+F used but never defined", decl);
8008 TREE_NO_WARNING (decl) = 1;
8011 wrapup_global_declaration_1 (decl);
8017 for (decl = globals; decl; decl = TREE_CHAIN (decl))
8018 reconsider |= wrapup_global_declaration_2 (decl);
8022 for (decl = globals; decl; decl = TREE_CHAIN (decl))
8023 check_global_declaration_1 (decl);
8026 /* A subroutine of c_write_global_declarations Emit debug information for each
8027 of the declarations in GLOBALS. */
8030 c_write_global_declarations_2 (tree globals)
8034 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
8035 debug_hooks->global_decl (decl);
8038 /* Preserve the external declarations scope across a garbage collect. */
8039 static GTY(()) tree ext_block;
8042 c_write_global_declarations (void)
8046 /* We don't want to do this if generating a PCH. */
8050 /* Don't waste time on further processing if -fsyntax-only or we've
8051 encountered errors. */
8052 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
8055 /* Close the external scope. */
8056 ext_block = pop_scope ();
8058 gcc_assert (!current_scope);
8062 tree tmp = BLOCK_VARS (ext_block);
8064 FILE * stream = dump_begin (TDI_tu, &flags);
8067 dump_node (tmp, flags & ~TDF_SLIM, stream);
8068 dump_end (TDI_tu, stream);
8072 /* Process all file scopes in this compilation, and the external_scope,
8073 through wrapup_global_declarations and check_global_declarations. */
8074 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8075 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
8076 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
8078 /* We're done parsing; proceed to optimize and emit assembly.
8079 FIXME: shouldn't be the front end's responsibility to call this. */
8082 /* After cgraph has had a chance to emit everything that's going to
8083 be emitted, output debug information for globals. */
8084 if (errorcount == 0 && sorrycount == 0)
8086 timevar_push (TV_SYMOUT);
8087 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8088 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
8089 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
8090 timevar_pop (TV_SYMOUT);
8096 #include "gt-c-decl.h"